Electric lifting device for small-space operation and application method

Abstract

The invention relates to the technical field of small-space operation, and discloses an electric lifting device for small-space operation and an application method.The electric lifting device comprises a lifting unit, a transmission unit and a lifting unit, the lifting unit comprises a scissor forklift body, a workbench is arranged above the scissor forklift body, and a protective fence is arranged above the workbench; a circular ring rotating plate is arranged above the workbench, and a circular ring placing plate is arranged on the circular ring rotating plate. According to the device, a rectangular barrel can be driven to move upwards by controlling a driving assembly to operate, so that a circular ring rotating plate can be driven to move upwards, a worker is further protected, and meanwhile, the driving assembly can further drive a moving rod to move upwards, so that a circular ring placing plate can be driven to move upwards; and when the worker needs to replace the tool, the worker can rotate the circular ring rotating plate, so that the circular ring rotating plate can drive the circular ring placing plate to rotate, and the tool can be replaced.

Description

Technical Field

[0001] This invention belongs to the field of small space operation technology, specifically, it relates to an electric lifting device and its application method for small space operations. Background Technology

[0002] In many confined space operations, such as pipeline repair, electrical circuit maintenance, and fine-tuning of equipment, workers not only need to precisely control the electric lifting device to reach the designated location, but also face the challenge of how to properly place and conveniently access the tools.

[0003] Traditional ways of carrying tools, such as hanging tool bags on the body or placing them on the ground at a distance, can easily cause inconvenience in small spaces, tools can be scattered and lost, and may even cause safety hazards due to collisions between tools.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0006] An electric lifting device for operation in confined spaces includes a lifting unit, a transmission unit, and a raising unit. The lifting unit includes a scissor lift body, a workbench above the scissor lift body, a guardrail above the workbench, a circular rotating plate above the workbench, and a circular placing plate on the circular rotating plate. The raising unit includes two second wedge blocks, which are symmetrical to each other and each has a raising component above it. The raising component is used to drive the circular placing plate to move upward. The transmission unit includes a driving component, which is used to drive the circular rotating plate to lift and also to drive the second wedge blocks to move.

[0007] In a preferred embodiment of the present invention, a circular slot is provided above the workbench, and a circular rotating plate is provided inside the circular slot. A circular sliding groove is provided at the bottom of the circular rotating plate, and two mutually symmetrical sliding blocks are slidably arranged inside the circular sliding groove. A slot is provided through the two sliding blocks.

[0008] In a preferred embodiment of the present invention, a circular groove is provided at the bottom of the inner cavity of the circular chute, the circular groove passes through the circular rotating plate, and a plurality of multi-stage telescopic rods are arranged in a circular distribution above the circular rotating plate, with the other end of each of the multi-stage telescopic rods respectively located at the bottom of the circular placement plate.

[0009] In a preferred embodiment of the present invention, the drive assembly includes a dual-axis motor. A first threaded rod is fixedly connected to the output end of the dual-axis motor. A second threaded rod is fixedly connected to the opposite ends of the two first threaded rods. The two second threaded rods are symmetrical to each other. A bearing is provided at the opposite ends of the two second threaded rods. The two bearings are respectively provided on the inner wall of the worktable. The two first threaded rods and the two second threaded rods have opposite screw directions. A first threaded sleeve is engaged on each of the two first threaded rods. A second threaded sleeve is engaged on each of the two second threaded rods. A sliding mechanism is provided at the bottom of each of the two first threaded sleeves and the two second threaded sleeves.

[0010] In a preferred embodiment of the present invention, the sliding mechanism includes guide grooves, which are respectively opened at the bottom of the inner cavity of the worktable. Four guide sliders are slidably arranged in the inner cavity of each guide groove. The four guide sliders are symmetrical to each other in pairs. A first threaded sleeve and a second threaded sleeve are respectively arranged above each guide slider.

[0011] In a preferred embodiment of the present invention, mounting plates are respectively provided above the two first threaded sleeves, and movable grooves are respectively provided on the side walls of the two mounting plates. The four movable grooves are symmetrical to each other, and movable sliders are slidably provided in the inner cavity of each of the four movable grooves. Fixed plates are provided at opposite ends of each of the four movable sliders. Two guide rods are movably passed through each of the four fixed plates. The four guide rods are symmetrical to each other, and slide rails are provided at opposite ends. Each slide rail is respectively provided on the inner wall of the worktable.

[0012] In a preferred embodiment of the present invention, each of the fixed plates has a connecting rod on one of its opposite sidewalls, and each of the four connecting rods has a first rotating wheel on one of its opposite sidewalls. Each of the first rotating wheels has a first wedge block on one of its opposite sidewalls, and each of the first wedge blocks has a first inclined surface on one of its opposite sidewalls, and an inclined groove is formed on the first inclined surface. Each inclined groove is respectively matched with the first rotating wheel.

[0013] In a preferred embodiment of the present invention, a placement plate is provided above each pair of the connecting rods, and a rectangular tube is provided above each of the two placement plates, with a rectangular slot provided on one side wall of the rectangular tube.

[0014] In a preferred embodiment of the present invention, the lifting assembly includes two second wedge blocks, which are respectively disposed on two second threaded sleeves. The two second wedge blocks are symmetrical to each other. A second inclined surface is provided on one side wall opposite to each pair of second wedge blocks, and a movable slot is provided on the second inclined surface. A second rotating wheel is fitted into each of the two movable slots. A connecting rod is provided on each of the two second rotating wheels. A movable rod is connected to one end of each of the two connecting rods away from the second rotating wheel. The two movable rods respectively movably pass through the rectangular tube, the top of the worktable, the sliding block, and the annular slot, and the port is slidably disposed at the bottom of the annular placement plate. The slope of the second inclined surface is greater than the slope of the first inclined surface.

[0015] An application method for an electric lifting device used in confined spaces includes the following steps:

[0016] Step 1: The operator moves the scissor lift to the work area and places the tools to be used on the circular placement plate. When the tools are in place, the operator stands in the middle above the workbench and controls the lifting device on the scissor lift to raise the workbench until it moves to the appropriate position.

[0017] Step 2: When the workbench moves to a certain position, the operator controls the drive assembly to operate. The drive assembly can lift the rectangular cylinder, thereby lifting the rotating ring plate. Therefore, the rotating ring plate can further ensure the safety of workers working at height.

[0018] Step 3: At the same time, when the drive component is running, it can also lift the ring placement plate. At this time, the moving speed of the ring placement plate is faster than the speed of the ring rotation plate, thus ensuring that the tools placed on the ring placement plate can be adjusted to the most comfortable position for the staff to pick up.

[0019] Step 4: When workers need to change tools while performing their work, they can rotate the circular rotating plate to move the required tools to their front, making it easier to change tools.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] This invention controls the operation of a drive component to move a rectangular cylinder upwards, which in turn moves a rotating annular plate upwards, providing further protection for the worker. Simultaneously, the drive component also moves a moving rod upwards, which in turn moves a circular placement plate upwards, allowing the tool to be moved to a suitable position for the worker. When the worker needs to change the tool, they can rotate the rotating annular plate, causing the circular placement plate to rotate as well, thus facilitating tool replacement.

[0022] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0023] In the attached diagram:

[0024] Figure 1 A three-dimensional structural diagram of an electric lifting device and its application method for working in small spaces;

[0025] Figure 2 A schematic diagram of a workbench structure for an electric lifting device and its application method for small-space operations;

[0026] Figure 3 A schematic diagram of a circular rotating plate structure for an electric lifting device and its application method for small-space operations.

[0027] Figure 4 A schematic diagram of a rectangular tube structure for an electric lifting device and its application method for small-space operations;

[0028] Figure 5 This is a cross-sectional view of a workbench for an electric lifting device and its application method used in small spaces.

[0029] Figure 6 A schematic diagram of the workbench structure from below for an electric lifting device and its application method used in small spaces.

[0030] Figure 7 A schematic diagram of the internal structure of a workbench for an electric lifting device and its application method used in small spaces.

[0031] Figure 8 A bottom view of the inner cavity of a workbench for an electric lifting device and its application method used in small spaces.

[0032] Figure 9 This is a schematic diagram of a partial structure of the inner cavity of a workbench for an electric lifting device and its application method used in small spaces.

[0033] Figure 10 This is a partial side view of the inner cavity of a workbench for an electric lifting device and its application method used in small spaces.

[0034] Figure 11 This is a partial cross-sectional view of the rotating ring plate of an electric lifting device and its application method for small-space operations.

[0035] In the picture:

[0036] 100. Lifting unit; 101. Scissor lift body; 102. Guardrail; 103. Circular ring placement plate; 104. Circular ring rotating plate; 1041. Circular slide; 1042. Sliding block; 1043. Circular ring slot; 105. Multi-stage telescopic rod; 106. Workbench;

[0037] 200. Transmission unit; 201. Dual-axis motor; 2011. First threaded rod; 2012. Second threaded rod; 2013. First threaded sleeve; 2014. Second threaded sleeve; 2015. Guide slider; 2016. Guide groove; 2017. Bearing; 202. Mounting plate; 2021. Moving groove; 2022. Moving slider; 2023. Fixing plate; 2024. Guide rod; 2025. Slide rail; 203. Connecting rod; 2031. Placement plate; 2032. First rotating wheel; 2033. First wedge block; 2034. Inclined slot; 2035. First inclined surface; 204. Rectangular cylinder; 2041. Rectangular slot;

[0038] 300, Lifting unit; 301, Second wedge block; 3011, Moving slot; 3012, Second inclined surface; 302, Connecting rod; 3021, Second rotating wheel; 3022, Moving rod. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention.

[0040] Example 1:

[0041] like Figures 1 to 11As shown, an electric lifting device for small-space operations includes a lifting unit 100, a transmission unit 200, and a raising unit 300. The lifting unit 100 includes a scissor lift body 101, a workbench 106 above the scissor lift body 101, a guardrail 102 above the workbench 106, a circular rotating plate 104 above the workbench 106, and a circular placing plate 103 on the circular rotating plate 104. The raising unit 300 includes two second wedge blocks 301, which are symmetrical to each other and each has a raising component above it. The raising component is used to drive the circular placing plate 103 to move upward. The transmission unit 200 includes a driving component, which is used to drive the circular rotating plate 104 to lift and also to drive the second wedge blocks 301 to move. By controlling the operation of the drive component, the rectangular cylinder 204 can be moved upward, which in turn moves the circular rotating plate 104 upward, thus providing further protection for the worker. At the same time, the drive component can also move the moving rod 3022 upward, which in turn moves the circular placement plate 103 upward, allowing the tool to be moved to a suitable position for the worker. When the worker needs to change the tool, he can rotate the circular rotating plate 104, which will cause the circular placement plate 103 to rotate, thereby changing the tool.

[0042] like Figures 1 to 8 and Figure 11 As shown, in a specific embodiment, a circular slot is provided above the workbench 106, and a circular rotating plate 104 is provided inside the circular slot. A circular sliding groove 1041 is provided at the bottom of the circular rotating plate 104, and two mutually symmetrical sliding blocks 1042 are slidably arranged inside the circular sliding groove 1041. The two sliding blocks 1042 have through slots. In this configuration, the components of the bottom of the circular rotating plate 104 are defined, ensuring that the circular rotating plate 104 can rotate.

[0043] like Figures 1 to 8 and Figure 11 As shown, further, a circular groove 1043 is provided at the bottom of the inner cavity of the circular groove 1041. The circular groove 1043 passes through the circular rotating plate 104. A plurality of multi-stage telescopic rods 105 arranged in a circular pattern are provided above the circular rotating plate 104. The other end of each multi-stage telescopic rod 105 is respectively provided at the bottom of the circular placement plate 103. In this configuration, it is ensured that when the circular rotating plate 104 rotates, the circular placement plate 103 can be rotated through the multi-stage telescopic rods 105.

[0044] Example 2:

[0045] The difference between the above embodiments and this embodiment is that: Figures 5 to 10As shown, an electric lifting device for small-space operations includes a drive assembly comprising a dual-axis motor 201. A first threaded rod 2011 is fixedly connected to the output end of the dual-axis motor 201. Two second threaded rods 2012 are fixedly connected to opposite ends of the two first threaded rods 2011, and are symmetrically arranged. Each opposite end of the two second threaded rods 2012 is provided with a bearing 2017, which is respectively disposed on the inner wall of the worktable 106. The first threaded rods 2011 and the two second threaded rods 2012 have opposite screw directions. A first threaded sleeve 2013 is engaged with each of the two first threaded rods 2011, and a second threaded sleeve 2014 is engaged with each of the two second threaded rods 2012. A sliding mechanism is provided at the bottom of each of the two first threaded sleeves 2013 and the two second threaded sleeves 2014. In this configuration, the installation position and components of the drive assembly are defined.

[0046] like Figures 5 to 10 As shown, in a specific embodiment, the sliding mechanism includes guide grooves 2016, which are respectively formed at the bottom of the inner cavity of the worktable 106. Four guide sliders 2015 are slidably disposed within each guide groove 2016, and the four guide sliders 2015 are symmetrically arranged in pairs. A first threaded sleeve 2013 and a second threaded sleeve 2014 are respectively disposed above each guide slider 2015. This arrangement ensures that the first threaded sleeve 2013 and the second threaded sleeve 2014 can move horizontally.

[0047] like Figures 5 to 10 As shown, furthermore, mounting plates 202 are respectively provided above the two first threaded sleeves 2013. Movable grooves 2021 are respectively formed on the side walls of the two mounting plates 202. The four movable grooves 2021 are symmetrically arranged in pairs. Movable sliders 2022 are slidably arranged inside the cavities of each of the four movable grooves 2021. Fixed plates 2023 are provided at opposite ends of each of the four movable sliders 2022. Two guide rods 2024 movably pass through each of the four fixed plates 2023. The four guide rods 2024 are symmetrically arranged in pairs, and slide rails 2025 are provided at opposite ends of each guide rod. Each slide rail 2025 is respectively provided on the inner wall of the worktable 106. This arrangement ensures that the fixed plates 2023 can move.

[0048] like Figures 5 to 10As shown, furthermore, each fixed plate 2023 has a connecting rod 203 on each pair of opposite sidewalls. Each pair of opposite ends of the four connecting rods 203 has a first rotating wheel 2032. Each first rotating wheel 2032 has a first wedge block 2033 on its opposite sidewall. Each pair of opposite sidewalls of the first wedge block 2033 has a first inclined surface 2035, and the first inclined surface 2035 has an inclined slot 2034. Each inclined slot 2034 engages with a first rotating wheel 2032. This configuration ensures that the first rotating wheel 2032 can move upwards.

[0049] like Figures 5 to 10 As shown, furthermore, a placement plate 2031 is provided above each pair of connecting rods 203, and a rectangular tube 204 is provided above each of the two placement plates 2031. A rectangular slot 2041 is opened on one side wall of the rectangular tube 204. In this configuration, it is ensured that the placement plate 2031 can move horizontally and upward, thereby driving the rectangular tube 204 to move upward.

[0050] like Figures 5 to 10 As shown, the lifting assembly further includes two second wedge blocks 301, which are respectively disposed on two second threaded sleeves 2014. The two second wedge blocks 301 are symmetrical to each other. A second inclined surface 3012 is provided on one side wall opposite to each of the two second wedge blocks 301, and a moving slot 3011 is provided on the second inclined surface 3012. A second rotating wheel 3021 is fitted in each of the two moving slots 3011. A connecting rod 302 is provided on each of the two second rotating wheels 3021. A moving rod 3022 is connected to one end of each connecting rod 302 away from the second rotating wheel 3021. The two moving rods 3022 respectively move through the rectangular tube 204, the worktable 106, the sliding block 1042, and the annular slot 1043, and the port is slidably disposed at the bottom of the annular placement plate 103. The slope of the second inclined surface 3012 is greater than the slope of the first inclined surface 2035. This setup defines the components and installation locations of the lifting assembly.

[0051] Example 3:

[0052] This invention also discloses an application method for an electric lifting device used in small-space operations, the steps of which are as follows:

[0053] Step 1: The operator moves the scissor lift body 101 to the place where the work needs to be done, and then places the tools to be used on the circular placement plate 103. When the tools are placed, the operator stands in the middle above the workbench 106. At this time, the lifting device set on the scissor lift body 101 is controlled by the controller to lift the workbench 106 until the workbench 106 is moved to a suitable position.

[0054] Step 2: When the workbench 106 moves to a certain position, the operator controls the drive assembly to operate. The drive assembly can lift the rectangular tube 204, thereby lifting the circular rotating plate 104. Therefore, the circular rotating plate 104 can further ensure the safety of the workers working at height.

[0055] Step 3: At the same time, when the drive component is running, it can also lift the circular placement plate 103. At this time, the moving speed of the circular placement plate 103 is faster than the speed of the circular rotating plate 104, thus ensuring that the tools placed on the circular placement plate 103 can be adjusted to the most comfortable position for the staff to pick up.

[0056] Step 4: When workers need to change tools while performing their work, they can rotate the circular rotating plate 104 to move the required tools to their front, making it easier to change tools.

[0057] The implementation principle of the electric lifting device and its application method for small-space operations in this embodiment is as follows:

[0058] The operator moves the scissor lift body 101 to the place where the work needs to be done, and then places the tools to be worked on the circular placement plate 103. When the tools are placed, the operator stands in the middle above the workbench 106. At this time, the operator controls the lifting device set on the scissor lift body 101 to operate through the controller, so that the workbench 106 can be lifted until the workbench 106 is moved to a suitable position.

[0059] When the workbench 106 moves to a certain position, the operator controls the dual-axis motor 201 to run. The dual-axis motor 201 can drive the first threaded rod 2011 to rotate, thereby driving the second threaded rod 2012 to rotate. When the first threaded rod 2011 and the second threaded rod 2012 rotate, they can drive the first threaded sleeve 2013 and the second threaded sleeve 2014 to move relative to each other with the assistance of the guide groove 2016 and the guide slider 2015 (because the screw directions of the first threaded rod 2011 and the second threaded rod 2012 are opposite).

[0060] When the first threaded sleeve 2013 moves, it can drive the mounting plate 202 to move. Because a fixing plate 2023 is provided on one side wall of the mounting plate 202, the fixing plate 2023 can move. When the fixing plate 2023 moves, it can drive the first rotating wheel 2032 to move. Therefore, the first rotating wheel 2032 can be lifted with the assistance of the first inclined surface 2035 and the inclined groove 2034 on the first wedge block 2033. When the first rotating wheel 2032 is lifted, it can drive the fixing plate 2023 to be lifted with the assistance of the moving slide 2021 and the moving slider 2022, thereby lifting the placement plate 2031. Therefore, it is ensured that the placement plate 2031 can be lifted and moved horizontally at the same time.

[0061] When the placement plate 2031 is raised, the rectangular tube 204 can be raised as well (because the rectangular tube 204 is movable through the upper wall of the workbench 106). When the rectangular tube 204 is raised, it can raise the sliding block 1042. When the sliding block 1042 is raised, it can raise the circular rotating plate 104. Therefore, the safety of workers working at height can be further guaranteed by the circular rotating plate 104.

[0062] Simultaneously, when the second threaded sleeve 2014 moves horizontally, it can drive the second wedge block 301 to move horizontally. When the second wedge block 301 moves horizontally, it can drive the second rotating wheel 3021 to lift (because the second wedge block 301 has a second inclined surface 3012, and the second inclined surface 3012 has a moving slot 3011, and the moving slot 3011 and the second rotating wheel 3021 are mutually engaged, thus ensuring that the second rotating wheel 3021 can be lifted). When the second rotating wheel 3021 lifts... When it is raised, it can drive the connecting rod 302 to be raised. When the connecting rod 302 is raised, it can drive the moving rod 3022 to be raised. Therefore, the moving rod 3022 can raise the circular placement plate 103, thus ensuring that the tools placed on the circular placement plate 103 can be adjusted to the most comfortable position for the staff to pick up (wherein, because the slope of the second inclined surface 3012 is greater than the slope of the first inclined surface 2035, the moving speed of the moving rod 3022 is ensured to be the same as the moving speed of the rectangular tube 204).

[0063] Meanwhile, when workers need to change tools during operations, they can rotate the circular rotating plate 104 to make it rotate (because the bottom of the circular rotating plate 104 has a circular groove 1041, and a sliding block 1042 is slidably arranged on the circular groove 1041, and the sliding block 1042 is fixedly connected to the rectangular tube 204, thus ensuring that the circular mounting plate 104 can rotate; at the same time, because the circular rotating plate 104 has a circular groove 1043 in the middle, and the circular rotating plate 104 and the circular placement plate 103 are connected by a multi-stage telescopic rod 105, thus ensuring that the circular placement plate 103 can rotate), so that the required tools can be moved in front of them, making it convenient to change tools.

Claims

1. An electric lifting device for working in small spaces, comprising a lifting unit (100), a transmission unit (200), and a hoisting unit (300), characterized in that: The lifting unit (100) includes a scissor lift body (101), a workbench (106) is provided above the scissor lift body (101), a guardrail (102) is provided above the workbench (106), a circular rotating plate (104) is provided above the workbench (106), and a circular placing plate (103) is provided on the circular rotating plate (104). The lifting unit (300) includes two second wedge blocks (301), which are symmetrical to each other and each is provided with a lifting component above it. The lifting component is used to drive the circular placement plate (103) to move upward. The transmission unit (200) includes a drive assembly for driving the annular rotating plate (104) to rise, and the drive assembly is also used to drive the second wedge block (301) to move.

2. The electric lifting device for small-space operations according to claim 1, characterized in that, A circular slot is provided above the workbench (106), and a circular rotating plate (104) is provided inside the circular slot. A circular sliding groove (1041) is provided at the bottom of the circular rotating plate (104). Two mutually symmetrical sliding blocks (1042) are slidably arranged inside the circular sliding groove (1041), and slots are provided through the two sliding blocks (1042).

3. The electric lifting device for small-space operations according to claim 2, characterized in that, The bottom of the inner cavity of the circular groove (1041) is provided with an annular groove (1043), which passes through the annular rotating plate (104). A plurality of multi-stage telescopic rods (105) are arranged in a circular pattern above the annular rotating plate (104), and the other end of each of the multi-stage telescopic rods (105) is respectively located at the bottom of the annular placement plate (103).

4. The electric lifting device for small-space operations according to claim 1, characterized in that, The drive assembly includes a dual-axis motor (201), the output end of which is fixedly connected to a first threaded rod (2011). The opposite ends of the two first threaded rods (2011) are fixedly connected to a second threaded rod (2012). The two second threaded rods (2012) are symmetrical to each other. Each opposite end of the two second threaded rods (2012) is provided with a bearing (2017). The two bearings (2017) are respectively provided on the inner wall of the worktable (106). The two first threaded rods (2011) and the two second threaded rods (2012) have opposite screw directions. Each of the two first threaded rods (2011) is engaged with a first threaded sleeve (2013). Each of the two second threaded rods (2012) is engaged with a second threaded sleeve (2014). The bottom of each of the two first threaded sleeves (2013) and the two second threaded sleeves (2014) is provided with a sliding mechanism.

5. An electric lifting device for small-space operations according to claim 4, characterized in that, The sliding mechanism includes guide grooves (2016), which are respectively opened at the bottom of the inner cavity of the worktable (106). Four guide sliders (2015) are slidably arranged in the inner cavity of each guide groove (2016). The four guide sliders (2015) are symmetrical to each other in pairs. A first threaded sleeve (2013) and a second threaded sleeve (2014) are respectively arranged above each guide slider (2015).

6. An electric lifting device for small-space operations according to claim 4, characterized in that, Mounting plates (202) are respectively provided above the two first threaded sleeves (2013). Movable grooves (2021) are respectively provided on the two side walls of the two mounting plates (202). The four movable grooves (2021) are symmetrical to each other. Movable sliders (2022) are slidably provided in the inner cavity of each of the four movable grooves (2021). Fixed plates (2023) are provided at opposite ends of each of the four movable sliders (2022). Two guide rods (2024) are movably passed through each of the four fixed plates (2023). The four guide rods (2024) are symmetrical to each other, and slide rails (2025) are provided at opposite ends of each guide rod. Each slide rail (2025) is respectively provided on the inner wall of the worktable (106).

7. An electric lifting device for small-space operations according to claim 6, characterized in that, Each of the four fixed plates (2023) has a connecting rod (203) on each of its two opposite sidewalls. Each of the four connecting rods (203) has a first rotating wheel (2032) on each of its two opposite ends. Each of the first rotating wheels (2032) has a first wedge block (2033) on its opposite sidewall. Each of the first wedge blocks (2033) has a first inclined surface (2035) on each of its two opposite sidewalls. An inclined groove (2034) is provided on the first inclined surface (2035). Each inclined groove (2034) is respectively matched with the first rotating wheel (2032).

8. An electric lifting device for small-space operations according to claim 7, characterized in that, Each of the connecting rods (203) has a placement plate (2031) above each other, and a rectangular tube (204) is provided above each of the two placement plates (2031). A rectangular slot (2041) is provided on one side wall of the rectangular tube (204).

9. An electric lifting device for small-space operations according to claim 1, characterized in that, The lifting assembly includes two second wedge blocks (301), which are respectively disposed on two second threaded sleeves (2014). The two second wedge blocks (301) are symmetrical to each other. A second inclined surface (3012) is provided on one side wall opposite to each other of the two second wedge blocks (301), and a moving slot (3011) is provided on the second inclined surface (3012). A second rotating wheel (3021) is fitted into each of the two moving slots (3011). Each of the two connecting rods (3021) is provided with a connecting rod (302). The two connecting rods (302) are connected to a moving rod (3022) at the ends away from the second rotating wheel (3021). The two moving rods (3022) are respectively movably passing through the rectangular tube (204), the worktable (106), the sliding block (1042), and the annular groove (1043), and the ends are slidably set at the bottom of the annular placement plate (103). The slope of the second inclined surface (3012) is greater than the slope of the first inclined surface (2035).

10. A method for applying an electric lifting device for operations in small spaces, characterized in that, An electric lifting device for small-space operations, applicable to any one of claims 1 to 9, is described in the following steps: Step 1: The worker moves the scissor lift body (101) to the place where the work needs to be done, and then places the tools to be used on the circular placement plate (103). When the tools are placed, the worker stands in the middle above the workbench (106). At this time, the lifting device set on the scissor lift body (101) is controlled by the controller to operate, so that the workbench (106) can be lifted until the workbench (106) is moved to a suitable position. Step 2: When the workbench (106) moves to a certain position, the staff will then control the drive assembly to run. The drive assembly can lift the rectangular tube (204), thereby lifting the circular rotating plate (104). Therefore, the safety of the staff working at height can be further guaranteed by the circular rotating plate (104). Step 3: At the same time, when the drive component is running, it can also lift the circular placement plate (103), and the moving speed of the circular placement plate (103) is faster than the speed of the circular rotating plate (104), thus ensuring that the tools placed on the circular placement plate (103) can be adjusted to the most comfortable position for the staff to pick up. Step 4: At the same time, when the worker needs to change tools while performing the work, he can rotate the circular rotating plate (104) so ​​that the required tools can be moved in front of him, making it easier to change tools.

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