Lifting device capable of being manually or electrically driven and feed switch

Abstract

The utility model discloses a lifting device capable of being manually or electrically driven and a feed switch, and belongs to the technical field of lifting devices.The lifting device comprises a mounting frame, a lifting plate is movably arranged on a guide rod in a sleeving mode, a lifter is arranged on a mounting bottom plate, and an output shaft of a motor is connected with a lead screw through a first bevel gear pair; the motor is used for driving the screw rod to rotate to drive the lifting plate to lift; the manual driving assembly and the power-off travel switch are both arranged on the mounting bottom plate, the first end of the connecting piece is connected with the lead screw through a second bevel gear pair, the driving shaft is used for sliding to the connecting piece and being connected with the second end of the connecting piece in a clamped mode, and the driving shaft is separated from the power-off travel switch after sliding to be separated from the connecting piece. The motor drives the lifter to drive the lifting plate to ascend and descend, or the manual driving assembly drives the lifter to drive the lifting plate to ascend and descend, and the motor is powered off in the driving process of the manual driving assembly, so that the electric or manual lifting function is achieved, and overall operation is quite efficient, convenient and fast.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lifting devices, in particular, to a lifting device which can be driven manually or electrically. In addition, the present application also relates to a feeder switch comprising the above-mentioned lifting device which can be driven manually or electrically. BACKGROUND

[0002] The information provided in this section is for the purpose of generally presenting the context of the present application. The work of the presently named inventors, to the extent the descriptions are described in this section, as well as aspects of the descriptions may neither expressly nor impliedly be considered prior art simply because of their inclusion in this section.

[0003] Lifting devices are commonly used devices in the field of electromechanics, and the structures of lifting devices vary greatly, and the core is to realize the lifting function. In the field of coal electrical equipment, the connection of the main circuit of explosion-proof switches such as vacuum feeder switches and vacuum electromagnetic starters mainly adopts direct connection of wires, that is, the wires and original devices are bolted and crimped together with the wires, and when maintenance or maintenance is required, the entire connection needs to be removed, and the machine core can be taken out from the shell of the explosion-proof switch. There are problems such as inconvenience to disassemble, low operation efficiency, etc. For example, a mine explosion-proof permanent magnet vacuum feeder switch disclosed in Chinese patent No. CN108389755A adopts an upper and lower plug-in structure for the main circuit, and the lifting device is controlled by a handle outside the shell to perform an upper and lower plug-in operation, which is simple and labor-saving, and ensures the personal safety of the operator.

[0004] However, the lifting mechanism structure of the existing permanent magnet vacuum feeder switch is relatively complex, and the manufacturing and maintenance costs are high, and the function switching of electric or manual control lifting cannot be conveniently realized, and there are problems of not being flexible and convenient to use.

[0005] It should be noted that the information disclosed in the above background section is only used to enhance the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. Content of the utility model

[0006] In view of at least one of the above technical problems, the present application provides a lifting device which can be driven manually or electrically, which can drive the lifting plate to lift by the motor driving the lifting machine, or drive the lifting plate to lift by the manual driving assembly driving the lifting machine, and the motor is powered off during the driving process of the manual driving assembly, thereby realizing the lifting function of electric or manual driving, and the overall operation is very efficient and convenient.

[0007] Meanwhile, the present application also provides a feeder switch comprising the above-mentioned lifting device which can be driven manually or electrically.

[0008] According to one aspect of the present application, a manually or electrically driven lifting device is provided, comprising a mounting frame, a lifting machine, a manually driven assembly, a motor and a power-off stroke switch:

[0009] The mounting frame comprises a mounting base plate and a vertically arranged guide rod, the lifting machine is arranged on the mounting base plate, the lifting plate assembly comprises a lifting plate sleeved on the guide rod, the circuit breaker assembly is arranged on the lifting plate, the output end of the lifting machine is connected with the lifting plate and is used for driving the lifting plate to move up and down along the guide rod, and the output shaft of the motor is connected with the first input end of the lifting machine;

[0010] The manually driven assembly comprises a driving shaft, a connecting piece and the power-off stroke switch, the first end of the connecting piece is connected with the second input end of the lifting machine, the driving shaft is slidably arranged on the mounting base plate, the driving shaft is used for sliding towards the connecting piece and being clamped with the second end of the connecting piece or sliding away from the connecting piece and being disengaged from the connecting piece, and the driving shaft is further used for driving the connecting piece to rotate after being clamped with the connecting piece, the power-off stroke switch is used for being triggered and cutting off the power supply of the motor in the process that the driving shaft slides towards the connecting piece, and the power-off stroke switch is further used for being disengaged from the driving shaft and conducting the power supply of the motor when the driving shaft slides away from the connecting piece.

[0011] In some embodiments of the present application, the manually driven assembly further comprises a power-off baffle, the power-off baffle is arranged on the driving shaft, and the power-off baffle is used for triggering the power-off stroke switch when the driving shaft slides towards the connecting piece.

[0012] In some embodiments of the present application, the manually driven assembly further comprises a mounting sleeve and a hand wheel, the mounting sleeve is arranged on the mounting base plate, the driving shaft is slidably arranged in the mounting sleeve, and the hand wheel is arranged at the end of the driving shaft away from the connecting piece.

[0013] In some embodiments of the present application, the manually driven assembly further comprises a latch, the second end of the connecting piece is provided with a connecting sleeve, a first insertion hole is arranged on the side wall of the connecting sleeve, a second insertion hole is arranged on the shaft head of the end of the driving shaft close to the connecting piece, the shaft head is used for being inserted into the connecting sleeve, and the latch is used for being sequentially inserted into the first insertion hole and the second insertion hole to lock and limit the connecting sleeve and the driving shaft.

[0014] In some embodiments of the present application, a first groove is arranged on the driving shaft, the manually or electrically driven lifting device further comprises a clamping assembly and a limiting assembly, the clamping assembly is rotatably arranged on the mounting frame, the clamping assembly is used for being clamped into the first groove to limit the sliding of the driving shaft, and the limiting assembly is arranged on the mounting frame, the limiting assembly is used for abutting against the clamping assembly and limiting the rotation of the clamping assembly when the clamping assembly is clamped into the first groove.

[0015] In some embodiments of the present application, the clamping component comprises a clamping piece and a supporting shaft, the supporting shaft is horizontally arranged on a preset supporting plate of the mounting frame, the clamping piece is rotatably sleeved on the supporting shaft, a first end of the clamping piece is provided with a clamping portion, the clamping portion is used for clamping into the first groove, and relief grooves are arranged on both sides of the clamping portion and used for avoiding interference between the clamping piece and the driving shaft when the clamping portion is separated from the first groove.

[0016] In some embodiments of the present application, a limiting slot is arranged on the clamping piece, and the clamping component further comprises a limiting rod, the limiting rod is horizontally arranged on a preset connecting plate of the mounting frame, and the limiting rod is used for being inserted into the limiting slot to limit the rotation angle of the clamping piece.

[0017] In some embodiments of the present application, a second end of the clamping piece is provided with a clamping slot, the limiting component comprises a mounting cylinder and a sliding piece, the mounting cylinder is arranged on a preset connecting rod of the mounting frame, and the sliding piece is slidingly arranged in the mounting cylinder, the sliding piece is used for extending out of the mounting cylinder to clamp into the clamping slot to limit the rotation of the clamping piece.

[0018] In some embodiments of the present application, a limiting portion is arranged on the sliding piece, a second groove is arranged on the limiting portion, the limiting portion is used for clamping into the clamping slot, and the second groove is used for being correspondingly arranged with the clamping slot after the limiting portion slides into the mounting cylinder to avoid interference between the sliding piece and the rotation of the clamping piece.

[0019] In addition, the present application also provides a feeder switch comprising the manually or electrically driven lifting device.

[0020] The present application has the following beneficial effects:

[0021] The manually or electrically driven lifting device of the present application is connected with the screw rod of the elevator through the first bevel gear pair, the screw rod is driven to rotate by starting the motor, and then the lifting plate is driven to ascend or descend along the guide rod. When it is needed to switch to manually control the ascending and descending of the lifting plate, the driving shaft is connected with the connecting piece, the connecting piece and the screw rod are synchronously rotated by manually rotating the driving shaft due to the connection between the connecting piece and the screw rod through the second bevel gear pair, the ascending and descending of the lifting plate can also be finely controlled, the power-off stroke switch is triggered by the driving shaft in the process of pushing the driving shaft to the connecting piece, the power supply of the motor is disconnected, no additional power-off operation is needed, the switching process is very fast and efficient, and the overall work efficiency is improved.

[0022] The feeder switch of the present application also has the above beneficial effects.

[0023] Of course, it is not necessary to achieve all the advantages described above when implementing any product of the present application. In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The present application will be further described below with reference to the drawings. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0025] Figure 1 This is a schematic diagram of the overall structure of a preferred embodiment of this application;

[0026] Figure 2 This is a schematic diagram of the card slot component according to a preferred embodiment of this application;

[0027] Figure 3 This is a schematic diagram of the structure of the limiting component according to a preferred embodiment of this application;

[0028] Figure 4 This is a schematic diagram of the installation of the drive shaft according to a preferred embodiment of this application;

[0029] Legend: 100, Mounting bracket; 101, Mounting base plate; 102, Lifting plate; 103, Guide rod; 200, Load; 1, Lifting machine; 11, Lead screw; 2, Manual drive assembly; 21, Drive shaft; 211, First groove; 22, Connecting piece; 221, Connecting sleeve; 23, Mounting sleeve; 24, Handwheel; 25, Power-off baffle; 3, Motor; 4, Positioning assembly; 41, Positioning piece; 411, Positioning part; 412, Clearance groove; 413, Positioning groove; 414, Limiting groove; 42, Support shaft; 43, Limiting rod; 5, Limiting assembly; 51, Mounting cylinder; 52, Sliding piece; 521, Second groove; 522, Limiting part; 6, Upper limit switch; 61, First mounting plate; 7, Lower limit switch; 71, Second mounting plate; 8, Power-off limit switch. Detailed Implementation

[0030] The embodiments of this application are described in detail below with reference to the accompanying drawings; however, this application may be implemented in a variety of different ways as defined and covered below.

[0031] Figure 1 This is a schematic diagram of the overall structure of a preferred embodiment of this application; Figure 2 This is a schematic diagram of the card slot component according to a preferred embodiment of this application; Figure 3 This is a schematic diagram of the structure of the limiting component according to a preferred embodiment of this application; Figure 4 This is a schematic diagram of the installation of the drive shaft according to a preferred embodiment of this application.

[0032] A lifting device that can be manually or electrically driven includes a mounting frame 100, a lifting platform 1, a manual drive assembly 2, a motor 3, and a power-off limit switch 8.

[0033] The mounting frame 100 comprises a mounting base plate 101 and a vertical guide rod 103, the elevator 1 is arranged on the mounting base plate 101, the lifting plate assembly 200 comprises a lifting plate 201 sleeved on the guide rod 103, the circuit breaker assembly 300 is arranged on the lifting plate 201, the output end of the elevator 1 is connected with the lifting plate 201 and is used for driving the lifting plate 201 to move up and down along the guide rod 103, the output shaft of the motor 3 is connected with the first input end of the elevator 1;

[0034] The manual driving assembly 2 comprises a driving shaft 21, a connecting piece 22 and a power-off stroke switch 8, the first end of the connecting piece 22 is connected with the second input end of the elevator 1, the driving shaft 21 is slidably arranged on the mounting base plate 101, the driving shaft 21 is used for sliding towards the connecting piece 22 and being clamped with the second end of the connecting piece 22 or sliding away from the connecting piece 22 and being separated from the connecting piece 22, the driving shaft 21 is also used for driving the connecting piece 22 to rotate after being clamped with the connecting piece 22, the power-off stroke switch 8 is used for being triggered and disconnecting the power supply of the motor 3 in the process that the driving shaft 21 slides towards the connecting piece 22, and the power-off stroke switch 8 is also used for being separated from the driving shaft 21 and connecting the power supply of the motor 3 when the driving shaft 21 slides away from the connecting piece 22.

[0035] Here, the meaning of "elevator 1" refers to a mechanism for providing a lifting driving power source, which comprises a base, a lead screw 11 rotatably arranged on the base, and the lead screw 11 is vertically arranged to drive the lifting plate 201 to move up and down along the guide rod 103 through the lead screw 11. In some embodiments, the output shaft of the motor 3 is connected with the lead screw 11 through a first bevel gear pair, and the first end of the connecting piece 22 is connected with the lead screw 11 through a second bevel gear pair.

[0036] Here, the meaning of "connecting piece 22" refers to a structure connected with the lead screw 11 through a second bevel gear pair. In some embodiments, the connecting piece 22 is a shaft part, and the connecting piece 22 is rotatably arranged on the side wall of the elevator 1.

[0037] The lifting device of the present application can be manually or electrically driven, the motor 3 and the lead screw 11 of the elevator 1 are connected through a first bevel gear pair, starting the motor 3 can drive the lead screw 11 to rotate, and then drive the lifting plate 102 to move up and down along the guide rod 103. When it is needed to switch to manually control the lifting of the lifting plate 102, it is only needed to push the driving shaft 21 to be connected with the connecting piece 22, since the connecting piece 22 is connected with the lead screw 11 through a second bevel gear pair, the driving shaft 21 can be manually rotated to drive the connecting piece 22 and the lead screw 11 to synchronously rotate, and the lifting of the lifting plate 102 can also be finely controlled, and in the process that the driving shaft 21 slides towards the connecting piece 22, the power-off stroke switch 8 can be triggered by the driving shaft 21 to disconnect the power supply of the motor 3, and no additional power-off operation is needed, and the switching process is very fast and efficient.

[0038] Preferably, please refer to Figure 1 and Figure 4 As shown in the figure, the manual driving assembly 2 further comprises a power-off baffle 25 arranged on the driving shaft 21, which is used to trigger the power-off stroke switch 8 when the driving shaft 21 slides to the connecting piece 22.

[0039] It can be understood that by arranging the power-off baffle 25 on the driving shaft 21, the power-off stroke switch 8 can be triggered by the power-off baffle 25 during the sliding process of the driving shaft 21 to the connecting piece 22, so as to realize seamless switching between electric lifting and manual lifting without additional operation of disconnecting the power supply of the motor 3. The position of the power-off baffle 25 on the driving shaft 21 can be adjusted conveniently to meet the setting of triggering stroke, which is conducive to adapting to different installation conditions.

[0040] Preferably, please refer to Figure 4 As shown in the figure, the manual driving assembly 2 further comprises a mounting sleeve 23 arranged on the mounting bottom plate 101, and a hand wheel 24 arranged at the end of the driving shaft 21 away from the connecting piece 22.

[0041] It can be understood that by arranging the hand wheel 24 on the driving shaft 21, the operator can conveniently rotate the driving shaft 21 manually through the hand wheel 24, which is conducive to improving the convenience of operation, and also facilitates the sliding of the driving shaft 21 through the hand wheel 24, thereby improving the control accuracy of the driving shaft 21.

[0042] Optionally, please refer to Figure 4 As shown in the figure, the manual driving assembly 2 further comprises a connecting sleeve 221 arranged at the second end of the connecting piece 22, a first insertion hole arranged on the side wall of the connecting sleeve 221, a second insertion hole arranged on the shaft head of the end of the driving shaft 21 close to the connecting piece 22, and a shaft head used for inserting into the connecting sleeve 221. A plug is used to pass through the first insertion hole and the second insertion hole in sequence to lock and limit the connecting sleeve 221 and the driving shaft 21.

[0043] It can be understood that in this optional solution, when the driving shaft 21 is clamped into the connecting sleeve 221, the plug can lock and limit the driving shaft 21 and the connecting sleeve 221 to realize the clamping and fixing of the driving shaft 21 and the connecting piece 22, and then the connecting piece 22 can be rotated through the driving shaft 21.

[0044] Optionally, the shaft head of the driving shaft 21 is provided with a spring buckle, and the side wall of the connecting sleeve 221 is provided with a clamping hole. The spring buckle and the clamping hole can also be matched to realize the convenient clamping of the driving shaft 21 and the connecting sleeve 221. At the same time, the connection and fastening of the driving shaft 21 and the connecting sleeve 221 can also be strengthened through bolts to ensure the stability of the connection.

[0045] Preferably, please refer toFigure 1 and Figure 4 As shown in The driving shaft 21 is provided with a first groove 211, and the manually or electrically driven lifting device further comprises a clamping assembly 4 and a limiting assembly 5. The clamping assembly 4 is rotatably arranged on the mounting frame 100 and is used to clamp into the first groove 211 to limit the sliding of the driving shaft 21. The limiting assembly 5 is arranged on the mounting frame 100 and is used to abut against the clamping assembly 4 and limit the rotation of the clamping assembly 4 when the clamping assembly 4 clamps into the first groove 211.

[0046] It can be understood that the sliding movement of the driving shaft 21 can be limited by clamping the clamping assembly 4 into the first groove 211. Since the clamping assembly 4 is rotatably arranged, in order to ensure the limiting stability of the clamping assembly 4 to the driving shaft 21 and facilitate the release of the clamping assembly 4 to the driving shaft 21, the rotation of the clamping assembly 4 is limited by abutting against the clamping assembly 4 through the limiting assembly 5.

[0047] Preferably, as shown in Figure 1 , 2 , and 3, the clamping assembly 4 comprises a clamping piece 41 and a supporting shaft 42. The supporting shaft 42 is horizontally arranged on a preset supporting plate of the mounting frame 100, and the clamping piece 41 is rotatably sleeved on the supporting shaft 42. A clamping portion 411 is arranged at a first end of the clamping piece 41, the clamping portion 411 is used to clamp into the first groove 211, and avoiding grooves 412 are arranged on both sides of the clamping portion 411, which are used to avoid interference between the clamping piece 41 and the driving shaft 21 when the clamping portion 411 is disengaged from the first groove 211.

[0048] It can be understood that the clamping piece 41 is overall in a fan shape, and the clamping portion 411 at the first end of the clamping piece 41 can clamp into the first groove 211 to limit the horizontal sliding of the driving shaft 21. When the clamping portion 411 is disengaged from the first groove 211, since the avoiding grooves 412 are arranged on the clamping piece 41, interference between the clamping piece 41 and the sliding of the driving shaft 21 can be avoided.

[0049] Preferably, as shown in Figure 2 The clamping piece 41 is provided with a limiting groove 414, and the clamping assembly 4 further comprises a limiting rod 43. The limiting rod 43 is horizontally arranged on a preset connecting plate of the mounting frame 100 and is used to insert into the limiting groove 414 to limit the rotation angle of the clamping piece 41.

[0050] It can be understood that, in order to limit the rotation angle of the clamping part 41, so as to avoid the interference between the clamping part 41 and the driving shaft 21 and affect the rotation of the driving shaft 21, the limiting rod 43 fixedly arranged in the horizontal direction is inserted into the limiting groove 414, which can limit the clockwise or counterclockwise rotation of the clamping part 41, so that the clamping part 41 can only rotate a certain angle, and the setting of the avoiding groove 412 ensures that the clamping part 41 does not interfere with the driving shaft 21.

[0051] It should be noted that the limiting groove 414 is an arc-shaped slot hole structure, and when the clamping part 41 rotates around the support shaft 42, the limiting rod 43 is inserted into the arc-shaped limiting groove 414 to limit the swing amplitude of the clamping part 41.

[0052] Preferably, as shown in Figure 2 , 3 The second end of the clamping part 41 is provided with a clamping groove 413, and the limiting assembly 5 comprises a mounting cylinder 51 and a sliding part 52. The mounting cylinder 51 is arranged on the connecting rod of the mounting frame 100, and the sliding part 52 is slidingly arranged in the mounting cylinder 51. The sliding part 52 is used to extend out of the mounting cylinder 51 and be clamped into the clamping groove 413 to limit the rotation of the clamping part 41.

[0053] Specifically, the limiting part 522 is arranged on the sliding part 52, and the second recess 521 is arranged on the limiting part 522. The limiting part 522 is used to be clamped into the clamping groove 413, and the second recess 521 is used to be correspondingly arranged with the clamping groove 413 after the limiting part 522 is slidingly arranged in the mounting cylinder 51, so as to avoid the interference of the sliding part 52 with the rotation of the clamping part 41.

[0054] Here, the clamping groove 413 is preferably an arc-shaped recess structure, which can better cooperate with the cylindrical limiting part 522 to limit the rotation of the clamping part 41.

[0055] It can be understood that the sliding part 52 is slidingly arranged in the clamping groove 413 through the limiting part 522 to limit the rotation of the clamping part 41, so as to stably limit the sliding of the driving shaft 21 through the clamping part 411, avoid the driving shaft 21 from being mistakenly touched to turn off the travel switch 8, and ensure that the motor 3 normally drives the screw rod 11 to rotate. When it is necessary to switch to the manual lifting function, the second recess 521 is pushed into the clamping groove 413 by pushing the sliding part 52, and at this time the second recess 521 has the function of avoiding interference with the clamping part 41, so that the clamping part 41 can be manually rotated, and the driving shaft 21 and the connecting part 22 are connected, and then the driving shaft 21 can be rotated by rotating the hand wheel 24, so as to realize the manual control of the lifting of the lifting plate 102. The lifting plate 102 can be used to place and fix the load 200, and the height of the load 200 can be manually and finely adjusted.

[0056] It should be noted that the position of the clamping groove 413 and the clamping portion 411 is preferably opposite, so as to ensure that the clamping portion 411 of the first end of the clamping piece 41 can be stably clamped into the first groove 211 when the sliding piece 52 slides into the clamping groove 413.

[0057] Optionally, referring to Figure 1 The manually or electrically driven lifting device further comprises an upper travel switch 6 and a lower travel switch 7, the upper travel switch 6 is arranged on a preset first mounting plate 61 of the mounting frame 100, and the upper travel switch 6 is located above the lifting plate 102, and the lower travel switch 7 is arranged on a preset second mounting plate 71 of the mounting frame 100, and the lower travel switch 7 is located below the lifting plate 102.

[0058] It can be understood that the upper travel switch 6 and the lower travel switch 7 can control the lifting range of the lifting plate 102, so as to monitor the position of the lifting plate 102 rising or falling, so as to adapt to different use conditions.

[0059] In addition, the application also provides a feeder switch comprising the manually or electrically driven lifting device.

[0060] The feeder switch of the application also comprises the above beneficial effects. Of course, the manually or electrically driven lifting device of the application can not only be applied to the feeder switch, but also can be applied to various electromechanical products that need to use the lifting function, and the lifting device of the application has good popularization and application value.

[0061] It should be noted that in this document, the terms "comprising", "containing" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or equipment.

[0062] The principles and implementation modes of the application are described by applying specific examples, and the above example is only used to help understand the method of the application and its core idea. The above description is only the preferred implementation mode of the application, and it should be pointed out that due to the limited nature of the language expression, there are infinite specific structures, and for ordinary skilled persons in the technical field, some improvements, decorations or changes can be made without departing from the principles of the application, and the above technical features can also be combined in an appropriate manner; these improvements, decorations, changes or combinations, or without improvement, directly applying the concept and technical scheme of the utility model to other occasions, should be regarded as the protection of the application.

Claims

1. A manually or electrically powered lifting device, characterized in that The utility model relates to a kind of manual drive circuit breaker, including mounting frame (100), elevator (1), manual drive assembly (2), motor (3) and power-off stroke switch (8): Mounting frame (100) includes installation bottom plate (101) and vertical guide rod (103), elevator (1) is arranged on installation bottom plate (101), lifting plate assembly (200) includes lifting plate (201) on guide rod (103), circuit breaker assembly (300) is installed on lifting plate (201), the output end of elevator (1) is connected with lifting plate (201) and is used to drive lifting plate (201) along guide rod (103) lifting movement, the output shaft of motor (3) is connected with the first input end of elevator (1); Manual drive assembly (2) includes drive shaft (21), connecting piece (22) and power-off stroke switch (8), the first end of connecting piece (22) is connected with the second input end of elevator (1), drive shaft (21) is slidably arranged on installation bottom plate (101), drive shaft (21) is used to slide along the direction towards connecting piece (22) and the second end of connecting piece (22) is clamped or slides away from connecting piece (22) and is separated, drive shaft (21) is also used to drive connecting piece (22) to rotate after being clamped with connecting piece (22), power-off stroke switch (8) is used to be triggered and disconnect the power supply of motor (3) in the process that drive shaft (21) slides towards connecting piece (22), power-off stroke switch (8) is also used to separate drive shaft (21) and the power supply of motor (3) is turned on when drive shaft (21) slides away from connecting piece (22).

2. A manually or electrically powered lifting device according to claim 1, characterised in that Manual drive assembly (2) further includes power-off baffle (25), power-off baffle (25) is arranged on drive shaft (21), power-off baffle (25) is used to trigger power-off stroke switch (8) when drive shaft (21) slides towards connecting piece (22).

3. A manually or electrically powered lifting device according to claim 1, characterised in that Manual drive assembly (2) further includes mounting sleeve (23) and hand wheel (24), mounting sleeve (23) is arranged on installation bottom plate (101), drive shaft (21) is slidably arranged in mounting sleeve (23), hand wheel (24) is arranged on the end of drive shaft (21) away from connecting piece (22).

4. A manually or electrically powered lifting device according to claim 1, characterised in that Manual drive assembly (2) further includes latch, the second end of connecting piece (22) is provided with connecting sleeve (221), first insertion hole is formed in the side wall of connecting sleeve (221), the shaft head of the end of drive shaft (21) close to connecting piece (22) is provided with second insertion hole, and the shaft head is used to insert connecting sleeve (221), and latch is used to be inserted into first insertion hole and second insertion hole in sequence to lock and position connecting sleeve (221) with drive shaft (21).

5. A manually or electrically powered lifting device according to claim 1, characterised in that The first recess (211) is arranged on the driving shaft (21), the manually or electrically driven lifting device further comprises a clamping assembly (4) and a limiting assembly (5), the clamping assembly (4) is rotatably arranged on the mounting frame (100), and the clamping assembly (4) is used for clamping into the first recess (211) to limit the sliding of the driving shaft (21); the limiting assembly (5) is arranged on the mounting frame (100), and the limiting assembly (5) is used for abutting against the clamping assembly (4) and limiting the rotation of the clamping assembly (4) when the clamping assembly (4) clamps into the first recess (211).

6. A manually or electrically powered lifting device according to claim 5, characterised in that, The clamping assembly (4) comprises a clamping piece (41) and a supporting shaft (42), the supporting shaft (42) is horizontally arranged on a preset supporting plate of the mounting frame (100), the clamping piece (41) is rotatably sleeved on the supporting shaft (42), a first end of the clamping piece (41) is provided with a clamping portion (411), the clamping portion (411) is used for clamping into the first recess (211), and both sides of the clamping portion (411) are provided with avoiding grooves (412), the avoiding grooves (412) are used for avoiding the interference between the clamping piece (41) and the driving shaft (21) when the clamping portion (411) is separated from the first recess (211).

7. A manually or electrically powered lifting device according to claim 6, characterised in that The clamping piece (41) is provided with a limiting groove (414), and the clamping assembly (4) further comprises a limiting rod (43), the limiting rod (43) is horizontally arranged on a preset connecting plate of the mounting frame (100), and the limiting rod (43) is used for being inserted into the limiting groove (414) to limit the rotation angle of the clamping piece (41).

8. A manually or electrically powered lifting device according to claim 6, characterised in that A second end of the clamping piece (41) is provided with a clamping groove (413), the limiting assembly (5) comprises a mounting cylinder (51) and a sliding piece (52), the mounting cylinder (51) is arranged on a preset connecting rod of the mounting frame (100), the sliding piece (52) is slidingly arranged in the mounting cylinder (51), and the sliding piece (52) is used for extending out of the mounting cylinder (51) to clamp into the clamping groove (413) to limit the rotation of the clamping piece (41).

9. A manually or electrically powered lifting device according to claim 8, characterised in that, The sliding piece (52) is provided with a limiting portion (522), the limiting portion (522) is provided with a second recess (521), the limiting portion (522) is used for clamping into the clamping groove (413), and the second recess (521) is used for being correspondingly arranged with the clamping groove (413) after the limiting portion (522) slides into the mounting cylinder (51) to avoid the interference of the sliding piece (52) with the rotation of the clamping piece (41).

10. A power feed switch characterized by comprising: The manually or electrically driven lifting device comprises any one of claims 1-9.

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