A load regulating and energy-saving distribution transformer

Abstract

The application relates to a load-regulating capacity-regulating voltage-regulating energy-saving distribution transformer and relates to the technical field of transformers; the load-regulating capacity-regulating voltage-regulating energy-saving distribution transformer comprises a transformer body, a mounting seat is further arranged at the bottom of the transformer body, a plurality of mounting holes are formed in the mounting seat, an adjusting mechanism is further arranged in the mounting seat, the adjusting mechanism comprises a lifting frame, a lifting assembly and a plurality of universal wheels, the lifting assembly is used for driving the lifting frame to displace along the height direction of the mounting seat, the displacement path of the lifting frame extends out of the mounting seat, and each universal wheel is mounted at the bottom end of the lifting frame. The application has the effect that the position of the load-regulating capacity-regulating voltage-regulating energy-saving distribution transformer can be conveniently adjusted.

Description

Technical Field

[0001] This application relates to the field of transformer technology, and in particular to an on-load capacity-adjustable voltage-adjustable energy-saving distribution transformer. Background Technology

[0002] On-load tap-changing energy-saving distribution transformers are transformers with two rated capacities, large and small. They can automatically detect and judge the load size of the power grid and automatically switch between the two capacities through a specially designed on-load tap-changing switch, thereby automatically adjusting the transformer capacity during operation and reducing power loss.

[0003] Regarding the aforementioned technologies, since the weight of existing on-load tap-changing energy-saving distribution transformers is generally quite large, it is often necessary to use a crane to move the transformer. This means that when it is necessary to fix the transformer, the position of the transformer needs to be repeatedly adjusted by the crane so that the reserved mounting holes on the transformer correspond to the holes on the installation site. This reduces the installation efficiency of the transformer and therefore needs to be improved. Summary of the Invention

[0004] To facilitate the adjustment of the position of the on-load capacity-adjustable voltage-adjustable energy-saving distribution transformer, this application provides an on-load capacity-adjustable voltage-adjustable energy-saving distribution transformer.

[0005] This application provides an on-load capacity-adjustable and voltage-adjustable energy-saving distribution transformer, which adopts the following technical solution:

[0006] An on-load capacity-adjustable voltage-adjustable energy-saving distribution transformer includes a transformer body, and a mounting base is provided at the bottom of the transformer body. The mounting base has several holes for installation, and an adjustment mechanism is provided inside the mounting base. The adjustment mechanism includes a lifting frame, a lifting assembly, and several casters. The lifting assembly is used to drive the lifting frame to move along the height direction of the mounting base, and the displacement path of the lifting frame extends outside the mounting base. Each caster is installed at the bottom end of the lifting frame.

[0007] By adopting the above technical solution, compared with the existing technology of moving the transformer by crane, which requires repeated adjustment of the transformer's position by crane to make the reserved mounting holes on the transformer correspond to the holes on the installation site, thus reducing the installation efficiency of the transformer, this application, through the setting of the adjustment mechanism, enables the lifting frame assembly to control the lifting frame to move downward when the crane places the transformer at the installation site, so that the universal wheels on the lifting frame are exposed outside the mounting base. This allows relevant personnel to directly push the transformer, moving it at the installation site and adjusting its position so that the holes on the mounting base correspond to the holes on the installation site. Thus, the specific position of the transformer can be directly adjusted without the need for a crane, effectively facilitating the adjustment of the transformer's position by relevant personnel and improving the efficiency of transformer installation.

[0008] Preferably, the lifting frame is slidably connected to the mounting base, and the sliding direction is the height direction of the mounting base. The lifting assembly includes a transmission frame, a sliding frame, and a lifting component. One end of the transmission frame is rotatably connected to the mounting base, and the other end is rotatably connected to the sliding frame. The sliding frame is slidably connected to the lifting frame, and the lifting component is used to drive the transmission frame to rotate relative to the mounting base.

[0009] By adopting the above technical solution and configuring the lifting component, when it is necessary to drive the lifting frame to slide, the lifting component can drive the transmission frame to rotate, thereby causing the transmission frame to rotate and drive the sliding frame to move, which in turn causes the sliding frame to drive the lifting frame to slide, thus achieving the driving of the lifting frame to slide. At the same time, compared with the prior art that directly uses a cylinder to drive, this application can transform the driving of the lifting frame to slide into the driving of the transmission frame to rotate, effectively saving the required space.

[0010] Preferably, the mounting base has an opening at its bottom, the adjustment mechanism is disposed in the opening, and the mounting base is also provided with a closing mechanism, the closing mechanism including a closing plate and a linkage component, the closing plate being slidably connected to the mounting base and used to close the opening at the bottom of the mounting base, and the linkage component being used to drive the closing plate to slide along its own sliding direction.

[0011] By adopting the above technical solution and setting the sealing mechanism, after the lifting frame retracts into the mounting base, the linkage component can drive the sealing plate to slide, thereby gradually closing the opening at the bottom of the mounting base. This reduces the probability of debris or insects entering the opening at the bottom of the mounting base after the transformer of this application is installed.

[0012] Preferably, the number of the sealing plate and the linkage component are both set to two, and they are correspondingly arranged, with the sealing plate located on opposite sides of the bottom opening of the mounting base.

[0013] By adopting the above technical solution, the number of sealing plates and linkage components is set to a certain number, so that the same opening at the bottom of the mounting base can be closed by two sealing plates, thereby effectively reducing the sliding amount when a single sealing plate closes the opening, which in turn facilitates the driving of the sealing plate by the linkage components, and at the same time reduces the space required for the sliding of the sealing plate.

[0014] Preferably, each of the close-to-each ends of the sealing plates has an upwardly extending abutment portion. The sealing mechanism also includes a fixing frame and a driving assembly. The fixing frame is slidably connected to the mounting base, and the sliding direction is perpendicular to the sliding direction of the sealing plate. The fixing frame has an opening at one end near the sealing plate, so that each of the abutment portions can be inserted into it after the fixing frame slides. The driving assembly is used to drive the fixing frame to slide.

[0015] By adopting the above technical solution, the setting of the fixing frame and the drive component allows the drive component to slide through the fixing frame, so that the abutment parts on both sealing plates are embedded in the openings on the fixing frame. By abutting against the inner sidewall of the opening on the fixing frame, the sealing plate itself is locked and fixed, effectively reducing the probability of the sealing plate opening accidentally.

[0016] Preferably, the drive assembly includes a drive gear and two drive racks. The drive gear is rotatably connected to the mounting base. The two drive racks are located on opposite sides of the drive gear and mesh with it. One drive rack is connected to the lifting frame, and the other drive rack is connected to the fixed frame.

[0017] By adopting the above technical solution and configuring the drive component, when the lifting frame slides, the lifting frame can drive the drive rack connected to it to move together, thereby enabling the drive rack to drive another drive rack to slide through the drive gear, thus realizing the drive of the fixed frame to slide. This effectively realizes the linkage between the fixed frame and the lifting frame, saves the active device for driving the fixed frame to slide, and also saves the space for setting up such an active device.

[0018] Preferably, the linkage component includes a linkage frame, one end of which is rotatably connected to the transmission frame, and the other end of which is rotatably connected to the enclosure plate.

[0019] By adopting the above technical solution and setting the linkage frame, when the lifting component drives the driven frame to rotate, the driven frame can be displaced, thereby enabling the driven frame to drive the sealing plate to slide, realizing the driving of the sealing plate to slide, effectively realizing the linkage between the lifting frame and the sealing plate, and saving the active device for driving the sealing plate to slide.

[0020] Preferably, the linkage component includes a clearance frame, which is rotatably connected to the end of the linkage frame away from the transmission frame. The clearance frame is slidably connected to the closing plate, and the sliding direction is the same as the sliding direction of the closing plate. The closing plate is also provided with a limiting part, which is located on the sliding path of the clearance frame and on the side of the clearance frame closer to the other closing plate.

[0021] By adopting the above technical solution, the setting of the clearance frame allows the linkage frame to drive the clearance frame to continue sliding after the two abutting parts abut against each other, so that the transmission frame can continue to rotate after the closing plate stops, and the lifting frame can continue to drive the fixed frame to slide, so that the two abutting parts can be smoothly embedded in the opening of the fixed frame.

[0022] Preferably, the linkage component further includes an elastic element located on one side of the relief frame along its own sliding direction, and the elastic element is used to reset the relief frame through its own elastic force.

[0023] By adopting the above technical solution, the elastic element is designed so that after the relief frame slides relative to the closing plate, the elastic element can store elastic potential energy. This allows the relief frame to slide before the closing plate when it moves back after relative displacement, so that both the relief frame and the closing plate can return to their initial positions.

[0024] Preferably, the number of lifting components is set to several, and the several lifting components are respectively located on opposite sides of the lifting frame.

[0025] By adopting the above technical solution and setting several lifting components, the stability of the lifting frame during sliding drive can be effectively guaranteed. At the same time, the stability of the lifting frame supporting the mounting base and transformer body can be improved, the probability of damage to the lifting frame and transmission frame can be reduced, and the service life of this application can be guaranteed.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. The adjustment mechanism is designed so that when the crane places the transformer at the installation location, the lifting frame assembly can control the lifting frame to move downwards, thereby exposing the casters on the lifting frame outside the mounting base. This allows personnel to directly push the transformer, moving it at the installation location and adjusting its position so that the holes on the mounting base correspond to the holes at the installation location. This eliminates the need for a crane to directly adjust the transformer's position, effectively facilitating personnel to adjust the transformer's position and improving the efficiency of transformer rotation.

[0028] 2. The enclosure mechanism is designed so that after the lifting frame retracts into the mounting base, the linkage component can drive the enclosure plate to slide, thereby gradually closing the opening at the bottom of the mounting base. This reduces the probability of debris or insects entering the opening at the bottom of the mounting base after the transformer of this application is installed.

[0029] 3. The arrangement of the fixing frame and the drive assembly allows the drive assembly to slide through the fixing frame, so that the abutment parts on both sealing plates are embedded in the openings on the fixing frame. By abutting against the inner sidewall of the opening on the fixing frame, the sealing plates are locked and fixed, effectively reducing the probability of the sealing plates opening accidentally. Attached Figure Description

[0030] Figure 1 This is a schematic diagram illustrating the overall structure of the on-load tap-changing energy-saving distribution transformer in the embodiments of this application.

[0031] Figure 2 This is a schematic diagram illustrating the structure of the adjustment mechanism in the embodiments of this application.

[0032] Figure 3 This is a structural schematic diagram illustrating the fixing frame in the embodiments of this application.

[0033] Figure 4 This is a structural schematic diagram illustrating the lifting component in the embodiments of this application.

[0034] Figure 5 This is a schematic diagram illustrating the structure of the driving component in the embodiments of this application.

[0035] Explanation of reference numerals in the attached drawings: 1. Transformer body; 2. Mounting base; 3. Adjustment mechanism; 31. Lifting frame; 32. Lifting assembly; 321. Transmission frame; 322. Sliding frame; 323. Lifting component; 324. Connecting frame; 33. Caster wheel; 4. Enclosing mechanism; 41. Enclosing plate; 411. Limiting part; 412. Abutting part; 42. Linkage assembly; 421. Linkage frame; 422. Yielding frame; 423. Elastic element; 43. Fixing frame; 44. Drive assembly; 441. Drive gear; 442. Drive rack. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0037] This application discloses an on-load tap-changing energy-saving distribution transformer. (Refer to...) Figure 1 and Figure 2The on-load tap-changing energy-saving distribution transformer includes a transformer body 1, and a mounting base 2 is provided at the bottom of the transformer body 1. The mounting base 2 has several holes for installation. An adjustment mechanism 3 is also provided inside the mounting base 2. The adjustment mechanism 3 includes a lifting frame 31, a lifting assembly 32, and several casters 33. The lifting assembly 32 is used to drive the lifting frame 31 to move along the height direction of the mounting base 2, and the displacement path of the lifting frame 31 extends outside the mounting base 2. Each caster 33 is installed at the bottom end of the lifting frame 31.

[0038] Reference Figure 2 In this embodiment, the bottom of the mounting base 2 has two openings, which are distributed along the width direction of the mounting base 2, and each bottom opening of the mounting base 2 is provided with an adjustment mechanism 3. Each lifting frame 31 is slidably connected to the mounting base 2, and the sliding direction is the height direction of the mounting base 2.

[0039] Reference Figure 2 and Figure 3 Each lifting frame 31 has two sets of lifting components 32, located at opposite ends of the lifting frame 31 along its length. Each set contains two lifting components 32, located on opposite sides of the lifting frame 31 along its width. In other embodiments, the lifting components 32 on the lifting frame 31 can be configured in three, four, five, or more sets to enhance the support effect on the mounting base 2.

[0040] Reference Figure 2 , Figure 3 and Figure 4 Each lifting assembly 32 includes a transmission frame 321, a sliding frame 322, and a lifting component 323. Each sliding frame 322 is slidably connected to the corresponding lifting frame 31 via a slide rail, and the sliding direction is the width direction of the lifting frame 31. Each lifting assembly 32 contains two transmission frames 321, located on opposite sides of the corresponding sliding frame 322.

[0041] Reference Figure 2 , Figure 3 and Figure 4 Each transmission frame 321 has one end rotatably connected to a corresponding sliding frame 322 via a pin, and the other end of each transmission frame 321 is rotatably connected to the mounting base 2 via a pin. Each lifting assembly 32 also includes a connecting frame 324, and each connecting frame 324 is fixedly connected to the middle of the two corresponding transmission frames 321 along the length direction. In this embodiment, the lifting member 323 is configured as a rotary cylinder, and the piston rod of each rotary cylinder is rotatably connected to the corresponding connecting frame 324 via a bearing. The cylinder body of each rotary cylinder is rotatably connected to the mounting base 2 via a bracket and a pin.

[0042] Reference Figure 2 , Figure 3 and Figure 4 Each opening at the bottom of the mounting base 2 is equipped with a closing mechanism 4. Each closing mechanism 4 includes two closing plates 41 and two linkage components 42. One end of each of the two closing plates 41 is inserted into the bottom of the mounting base 2 and is slidably connected to the mounting base 2, with the sliding direction being the width direction of the corresponding lifting frame 31. The two closing plates 41 are located on both sides of the corresponding opening along the width direction of the lifting frame 31, and the ends of the two closing plates 41 that are close to each other are attached together.

[0043] Reference Figure 2 and Figure 4 Each linkage component 42 includes a linkage frame 421 and a clearance frame 422. In this embodiment, each linkage component 42 has two linkage frames 421 and two clearance frames 422, located at opposite ends of the closing plate 41 along its length. One end of each linkage frame 421 is rotatably connected to the corresponding transmission frame 321, and the other end of each linkage frame 421 is rotatably connected to the corresponding clearance frame 422 via a pin. In other embodiments, the number of linkage frames 421 and clearance frames 422 in each linkage component 42 can be three, four, five, or more.

[0044] Reference Figure 2 and Figure 4 Each sealing plate 41 has two limiting portions 411 extending upward from the top of the end away from the other sealing plate 41. The two limiting portions 411 are distributed along the length direction of the sealing plate 41 and are integrally formed with the corresponding sealing plate 41. The end of each sealing plate 41 away from the other sealing plate 41 is also convex upward.

[0045] Reference Figure 2 and Figure 4 Each yielding frame 422 is located between the corresponding limiting part 411 and the upward protrusion at the end of the closing plate 41, and each end of the yielding frame 422 is slidably connected to the corresponding closing plate 41, and the sliding direction is the same as the sliding direction of the corresponding closing plate 41, so that the limiting part 411 is located on the sliding path of the yielding frame 422.

[0046] Reference Figure 2 and Figure 4 Each linkage component 42 further includes two elastic elements 423, and the elastic elements 423 are correspondingly arranged with the clearance brackets 422. In this embodiment, the elastic element 423 is configured as a compression spring, which is sleeved on the corresponding closing plate 41 and located on the side of the corresponding clearance bracket 422 closer to the other closing plate 41. One end of each compression spring abuts against the corresponding clearance bracket 422, and the other end abuts against the corresponding closing plate 41.

[0047] Reference Figure 2 , Figure 3 and Figure 4 In the initial state, the lifting frame 31 and the casters 33 are completely located inside the bottom opening of the mounting base 2. At this time, the two closing plates 41 inside the opening are in contact, thus closing the opening. When it is necessary to adjust the position of the mounting base 2, the lifting component 323 drives the corresponding transmission frame 321 to rotate. As a result, when the transmission frame 321 drives the sliding frame 322 to move downward, the sliding frame 322 slides relative to the lifting frame 31, and drives the lifting frame 31 to move downward.

[0048] Reference Figure 2 , Figure 3 and Figure 4 During this process, each transmission frame 321 drives the corresponding linkage frame 421 to move, thereby causing each linkage frame 421 to drive the corresponding clearance frame 422 to slide. When the clearance frame 422 abuts against the protrusion on the end of the corresponding closing plate 41, the clearance frame 422 pushes the corresponding closing plate 41 to slide, thereby driving the closing plate 41 and causing the closing plate 41 to gradually open, thus removing the closure of the bottom opening of the mounting base 2.

[0049] Reference Figure 2 , Figure 3 and Figure 5 Each sealing plate 41 has an upwardly extending abutment portion 412 near the top of one end of another corresponding sealing plate 41. Each abutment portion 412 is integrally formed with the corresponding sealing plate 41, and the abutment portions 412 on two adjacent sealing plates 41 abut against each other. Each sealing mechanism 4 also includes a fixing frame 43 and a drive assembly 44. The top of each fixing frame 43 extends upward and passes through the corresponding lifting frame 31, and is slidably connected to the mounting base 2, with the sliding direction being the height direction of the mounting base 2.

[0050] Reference Figure 3 and Figure 5 Each fixing bracket 43 has an opening at its bottom, and the abutment portions 412 on the two corresponding closed plates 41 are embedded in the openings at the bottom of the corresponding fixing bracket 43 and abut against the inner sidewalls of the openings at the bottom of the fixing bracket 43. Each drive assembly 44 includes a drive gear 441 and two drive racks 442, and each drive gear 441 is rotatably connected to the mounting base 2 via a pin.

[0051] Reference Figure 3 and Figure 5 Two drive racks 442 are located on opposite sides of the drive gear 441 and mesh with the drive gear 441. The bottom end of one drive rack 442 is fixedly connected to the top of the lifting frame 31, and the other drive rack 442 is fixedly connected to the corresponding fixed frame 43, so that the lifting frame 31 can drive the fixed frame 43 to slide.

[0052] Reference Figure 2 , Figure 3 and Figure 5 In the initial state, when the lifting frame 31 and the casters 33 are completely within the opening of the mounting base 2, the abutment portion 412 on each sealing plate 41 is embedded in the bottom opening of the corresponding fixed frame 43, thereby locking the sealing plate 41. When the lifting component 323 drives the transmission frame 321 to rotate, causing the lifting frame 31 to slide downward, the lifting frame 31 drives one of its drive racks 442 to slide, which in turn drives another drive rack 442 to slide upward through the drive gear 441. This causes the drive rack 442 to drive the fixed frame 43 to slide upward, thereby causing the fixed frame 43 to gradually disengage from the abutment portion 412.

[0053] Reference Figure 2 , Figure 3 and Figure 5 During this process, the clearance frame 422 slides relative to the closing plate 41. After the fixing frame 43 completely disengages from the abutment part 412, the clearance frame 422 abuts against the limiting part 411 on the corresponding closing plate 41, thereby causing the clearance frame 422 to drive the closing plate 41 to slide, which in turn causes the bottom opening of the mounting base 2 to gradually open.

[0054] The implementation principle of an on-load tap-changing energy-saving distribution transformer according to an embodiment of this application is as follows: When the position of the mounting base 2 needs to be adjusted, the lifting component 323 drives the corresponding transmission frame 321 to rotate, thereby causing the transmission frame 321 to drive the sliding frame 322 to move downward. The sliding frame 322 slides relative to the lifting frame 31, and drives the lifting frame 31 to move downward. At this time, each transmission frame 321 drives the corresponding linkage frame 421 to move, thereby causing each linkage frame 421 to drive the corresponding clearance frame 422 to slide.

[0055] During this process, the lifting frame 31 drives one of its linkage racks to slide, thereby causing the drive rack 442 to drive another drive rack 442 to slide upward through the drive gear 441. This, in turn, causes the drive rack 442 to drive the fixed frame 43 to slide upward, gradually disengaging the fixed frame 43 from the abutment part 412. When the yielding frame 422 abuts against the protrusion on the end of the corresponding sealing plate 41, the yielding frame 422 pushes the corresponding sealing plate 41 to slide together, driving the sealing plate 41 and gradually opening it, thus removing the closure of the bottom opening of the mounting base 2. Afterward, the casters 33 on the lifting frame 31 protrude from the mounting base 2, allowing personnel to adjust the installation position of the mounting base 2 by pushing the transformer body 1.

[0056] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An on-load capacity-regulating and voltage-regulating energy-saving distribution transformer, comprising a transformer body (1), wherein a mounting base (2) is further provided at the bottom of the transformer body (1), and the mounting base (2) is provided with a plurality of mounting holes, characterized in that: The mounting base (2) is also provided with an adjustment mechanism (3). The adjustment mechanism (3) includes a lifting frame (31), a lifting component (32) and several casters (33). The lifting component (32) is used to drive the lifting frame (31) to move along the height direction of the mounting base (2), and the displacement path of the lifting frame (31) extends outside the mounting base (2). Each caster (33) is installed at the bottom end of the lifting frame (31). The lifting frame (31) is slidably connected to the mounting base (2), and the sliding direction is the height direction of the mounting base (2). The lifting assembly (32) includes a transmission frame (321), a sliding frame (322), and a lifting component (323). One end of the transmission frame (321) is rotatably connected to the mounting base (2), and the other end is rotatably connected to the sliding frame (322). The sliding frame (322) is slidably connected to the lifting frame (31). The lifting component (323) is used to drive the transmission frame (321) to rotate relative to the mounting base (2). The mounting base (2) has an opening at its bottom, and the adjustment mechanism (3) is located in the opening. The mounting base (2) is also provided with a closing mechanism (4). The closing mechanism (4) includes a closing plate (41) and a linkage component (42). The closing plate (41) is slidably connected to the mounting base (2) and is used to close the opening at the bottom of the mounting base (2). The linkage component (42) is used to drive the closing plate (41) to slide along its own sliding direction. The linkage component (42) includes a linkage frame (421), one end of which is rotatably connected to the transmission frame (321), and the other end of which is rotatably connected to the closing plate (41). The number of the closing plate (41) and the linkage component (42) are both set to two, and they are set in a corresponding manner. The closing plate (41) is located on opposite sides of the bottom opening of the mounting base (2). The closing plates (41) each have an abutment portion (412) extending upward at their close ends. The closing mechanism (4) also includes a fixing frame (43) and a driving assembly (44). The fixing frame (43) is slidably connected to the mounting base (2), and the sliding direction is perpendicular to the sliding direction of the closing plate (41). The fixing frame (43) has an opening at one end near the closing plate (41) for each abutment portion (412) to be inserted after the fixing frame (43) slides. The driving assembly (44) is used to drive the fixing frame (43) to slide.

2. The on-load tap-changing and voltage-regulating energy-saving distribution transformer according to claim 1, characterized in that: The drive assembly (44) includes a drive gear (441) and two drive racks (442). The drive gear (441) is rotatably connected to the mounting base (2). The two drive racks (442) are located on opposite sides of the drive gear (441) and mesh with the drive gear (441). One drive rack (442) is connected to the lifting frame (31), and the other drive rack (442) is connected to the fixing frame (43).

3. The on-load tap-changing and voltage-regulating energy-saving distribution transformer according to claim 2, characterized in that: The linkage component (42) includes a clearance frame (422), which is rotatably connected to the end of the linkage frame (421) away from the transmission frame (321). The clearance frame (422) is slidably connected to the closing plate (41), and the sliding direction is the same as the sliding direction of the closing plate (41). The closing plate (41) is also provided with a limiting part (411), which is located on the sliding path of the clearance frame (422) and on the side of the clearance frame (422) closer to the other closing plate (41).

4. The on-load tap-changing and voltage-regulating energy-saving distribution transformer according to claim 3, characterized in that: The linkage component (42) further includes an elastic element (423), which is located on one side of the relief frame (422) along its own sliding direction. The elastic element (423) is used to reset the relief frame (422) by its own elastic force.

5. The on-load tap-changing and voltage-regulating energy-saving distribution transformer according to claim 1, characterized in that: The number of lifting components (32) is set to several, and several lifting components (32) are respectively located on opposite sides of the lifting frame (31).

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