Stepless-adjustable lifting operation device
By combining the scissor lifting mechanism with the variable-section telescopic tower body, the stepless height adjustment required for the inner wall concrete spraying of the dome-type air-film outer wall structure building is achieved, solving the problem that the prior art cannot achieve stepless height adjustment, and ensuring the safety and reliability of construction.
Patent Information
- Application Number
- CN202510090286.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2025-05-02
AI Technical Summary
When the dome-type air-film outer wall structure is sprayed with concrete on the inner wall, existing lifting equipment cannot achieve stepless adjustment of height, resulting in the inability to complete the inner wall concrete spraying safely and reliably.
The lifting frame is adopted that combines the scissor lifting mechanism and the variable-section telescopic tower body to achieve stepless adjustment of the lifting frame height. The device uses friction blocks and oil cylinders to achieve stable lifting and stepless lifting of the tower body through the combination of telescopic tower body, beam frame, scissor lifting mechanism and lifting sleeve.
The stepless height adjustment of the lifting working platform is realized, ensuring the safety and reliability of inner wall concrete spraying, and is suitable for building structures with large spans.
Smart Images
Figure CN119911848A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of lifting machinery, and in particular to a steplessly adjustable lifting operation device. Background Art
[0002] As a new type of building structure with a large span, the dome-type air membrane outer wall structure has strong disaster and earthquake resistance and is often used in storage equipment such as granaries and coal. After the dome structure is completed, the inner wall of the building needs to be sprayed. The commonly used lifting and climbing equipment cannot achieve stepless height adjustment due to its own structural reasons, so it cannot be used for inner wall concrete spraying. Therefore, a lifting work platform that can cover the entire working surface is needed to safely and reliably complete the inner wall concrete spraying. As a key component of the working platform, the lifting device carries important functions such as adjusting the platform height. Summary of the invention
[0003] In order to solve the above technical problems, the present invention provides a steplessly adjustable lifting device, which combines a scissor lift mechanism with a variable-section telescopic tower body to achieve stepless adjustment of the height of the lifting frame.
[0004] The present invention adopts the following technical solutions:
[0005] A steplessly adjustable lifting device, comprising:
[0006] The telescopic tower body includes several standard sections which are arranged in sequence and a cylinder for driving the standard sections to be lifted;
[0007] The beam frame is set on the outermost standard section;
[0008] A scissor lift mechanism, one end of which is arranged on the beam frame;
[0009] The lifting sleeve frame is connected to the other end of the scissor lift mechanism and comprises a plurality of first friction blocks which abut against the standard sections and guide the lifting of the scissor lift mechanism.
[0010] Preferably, the telescopic tower body comprises 5 tower body sections with different cross-sectional sizes, which are the first standard section, the second standard section, the third standard section, the fourth standard section and the fifth standard section from large to small. The first standard section is located at the top, a first oil cylinder is provided between the first standard section and the third standard section, a second oil cylinder is provided between the third standard section and the fifth standard section, and the first oil cylinder and the second oil cylinder are alternately arranged.
[0011] Preferably, two layers of second friction blocks are provided at the bottom of the first standard section, the second friction blocks are in contact with the outer side of the main chord of the second standard section, and a joint is provided on the main chord of the second standard section. After being lifted into place, the second friction blocks are against the bottom of the joint.
[0012] Preferably, the main material of the first standard section is angle steel, and the upper and lower layers are each provided with 4 pin holes. The upper pin holes are connected to the second standard section after the tower body is contracted, and the lower pin holes are connected to the second standard section after the tower body is extended; a lifting cylinder seat is welded on the top of the first standard section.
[0013] Preferably, the main material of the second standard section is angle steel, the upper layer of the second standard section has 4 joints, and the joints have two pin holes. The upper pin hole is connected to the first standard section after the tower body is extended, and the lower pin hole is connected to the third standard section after the tower body is contracted.
[0014] Preferably, a pin pushing device is installed on the transverse rod at the upper end of the second standard section. The pin pushing device is provided with a pushing cylinder and a locking pin located at one end of the pushing cylinder. The rear end of the locking pin is provided with a connecting groove, in which one end of a connecting block is clamped, and the other end of the connecting block is connected to the piston rod head of the pushing cylinder.
[0015] Preferably, the main material of the third standard section is angle steel, and four connectors connected to the second standard section are welded on the top. The upper end of the third standard section is provided with a detachable multi-stage cylinder clamp, and the multi-stage cylinder clamp is connected to the crossbeam on the upper part of the third standard section by bolts. A first cylinder connecting ear plate is provided on the outside of the multi-stage cylinder clamp and a second cylinder connecting ear plate is provided on the back side. The first cylinder is connected between the lifting cylinder seat of the first standard section and the first cylinder connecting ear plate; the main material of the fifth standard section is square steel pipe, and four L-shaped joints connected to the fourth standard section are provided on the top. A lower cylinder ear plate is welded at the bottom crossbeam of the fifth standard section, and the second cylinder is connected between the lower cylinder ear plate and the second cylinder connecting ear plate.
[0016] Preferably, the beam frame is a detachable structure, including beams welded to both sides of the bottom of the first standard section and two half frames connected to both ends of the beam by pins; a scissor-type connecting ear plate connected to a scissor-type lifting mechanism is provided in the middle of the half frame.
[0017] Preferably, the bottom of the scissors-type lifting mechanism is connected to the crossbeam frame at the bottom of the first standard section through an ear plate; the scissors-type lifting mechanism includes a left scissors-type assembly and a right scissors-type assembly, and the left scissors-type assembly and the right scissors-type assembly are connected and move synchronously through a connecting rod; the scissors-type lifting mechanism includes short scissors-type arms located at the bottom and the top and a plurality of long scissors-type arms located in the middle, and an adjusting cylinder is provided between the short scissors-type arms at the bottom and the short scissors-type arms at the top; the top of the scissors-type lifting mechanism is connected to the outer frame of the lifting frame through an ear plate.
[0018] Preferably, the lifting sleeve comprises an inner frame and an outer frame, an ear plate connected to the scissors-type lifting mechanism is welded on the outer frame, and two layers of upper and lower first friction blocks are welded on the inner side of the inner frame, and the first friction blocks are in contact with the main chord rod outside the first standard section; an equipment platform is provided on the upper side of the lifting sleeve, and the equipment platform is installed on the transverse web of the lifting sleeve through a pin; a scissors-type ear plate seat is welded on the inner cross bar of the outer frame, and the scissors-type ear plate seat is connected to the upper part of the scissors-type lifting mechanism through a pin; the inner frame and the outer frame are provided with transverse connecting ear plates, and the lifting platform is connected to the transverse connecting ear plates.
[0019] Compared with the prior art, the present invention has the following advantages:
[0020] 1. The telescopic tower body adopts an inner and outer nesting mode. The inner and outer tower bodies are connected in pairs through the joint at the top of the tower body and the pin shaft hole on the main chord of the tower body. The tower bodies are guided by friction blocks to ensure the stability of the tower body during the jacking process. At the same time, mechanical limiters are used on the friction block fixing seat and the bottom foundation of the tower body joint to ensure that the pin shaft holes of the tower body can be aligned in pairs.
[0021] 2. Hydraulic cylinders are used between the pin holes of the telescopic tower to push the pins synchronously, without the need for manual pushing of the pins, and limit positions are set. This ensures that the pins do not exceed their set travel while achieving automatic pushing of the pins, thus ensuring the safety of the equipment during construction.
[0022] 3. A scissor lift mechanism is set between the telescopic tower body and the lifting sleeve. The scissor lift mechanism and the first standard section are connected by a lifting sleeve. The friction block on the sleeve contacts the outer side of the main chord of the tower body to play a guiding role, realizing stepless lifting while ensuring the stability and stability of the scissor lift when lifting.
[0023] 4. The scissor lift mechanism uses one cylinder for lifting on each side, which has relatively lower requirements for the layout of the cylinder oil pipe and the synchronization requirements. The bottom and top of the scissor lift mechanism are fixed, which ensures that the scissor arm is stressed while reducing the lateral space occupied by the scissor arm. The operation of lifting the scissor arm is more convenient and quick.
[0024] 5. The scissor lift mechanism has a heavy load-bearing capacity, and the two sides of the scissor lift mechanism can be disassembled. The scissor lift mechanism can be hoisted and installed in sections when the equipment is assembled, making disassembly and assembly more convenient and quick.
[0025] 6. The two lifting cylinders of the tower body are arranged on the inner side of the tower body and are staggered, which ensures the smooth lifting of the tower body while saving layout space. The product structure is more compact and occupies less space. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 It is a schematic diagram of the structure of a steplessly adjustable lifting operation device.
[0027] Figure 2 It is a side view of a steplessly adjustable lifting device.
[0028] Figure 3 It is a structural diagram of the telescopic tower.
[0029] Figure 4 for Figure 3 A partial enlarged view of part A.
[0030] Figure 5 It is a structural schematic diagram of the scissors lifting mechanism in the retracted state.
[0031] Figure 6 It is a structural schematic diagram of the scissors lifting mechanism in the extended state.
[0032] Figure 7 It is a structural schematic diagram of the lifting frame.
[0033] Figure 8 A top view of the lifting frame.
[0034] Fig. 9 This is a structural diagram of the first standard section.
[0035] Fig.10 This is a structural diagram of the beam frame.
[0036] Fig.11 This is a structural diagram of the second standard section.
[0037] Fig.12 It is a structural schematic diagram of the pin push device.
[0038] Fig.13 This is a structural diagram of the third standard section.
[0039] Fig.14 This is a structural diagram of the fifth standard section.
[0040] In the figure, the telescopic tower body 1, the first standard section 1-1, the second friction block 1-1-1, the second standard section 1-2, the joint 1-2-1, the third standard section 1-3, the multi-stage cylinder clamp 1-3-1, the first cylinder connecting ear plate 1-3-2, the second cylinder connecting ear plate 1-3-3, the fourth standard section 1-4, the fifth standard section 1-5, the L-shaped joint 1-5-1, the lower cylinder ear plate 1-5-2, the first cylinder 1-6, the second cylinder 1- 7. crossbeam frame 2, crossbeam 2-1, half frame 2-2, scissors connecting ear plate 2-3, scissors lifting mechanism 3, short scissors arm 3-1, long scissors arm 3-2, adjusting cylinder 3-3, lifting sleeve 4, first friction block 4-1, inner frame 4-2, outer frame 4-3, scissors ear plate seat 4-3-1, equipment platform 4-4, pin shaft pushing device 5, locking pin shaft 5-1, connecting groove 5-1-1, connecting block 5-1-2, pushing cylinder 5-2. DETAILED DESCRIPTION
[0041] In order to facilitate the understanding of the technical solution of the present invention, a detailed description is given below in conjunction with the accompanying drawings and specific embodiments.
[0042] Example 1
[0043] like Figure 1-2 As shown, a steplessly adjustable lifting device comprises:
[0044] The telescopic tower body 1 includes a plurality of standard sections which are sequentially sleeved and a cylinder for driving the standard sections to be lifted;
[0045] The crossbeam frame 2 is arranged on the outermost standard section;
[0046] A scissor lift mechanism 3, one end of which is arranged on the crossbeam frame 2;
[0047] The lifting frame 4 is connected to the other end of the scissor lift mechanism 3, and includes a plurality of first friction blocks 4-1 which abut against the standard sections and guide the lifting of the scissor lift mechanism 3.
[0048] like Figure 3 As shown, in this embodiment, the telescopic tower body 1 includes 5 tower body sections with different cross-sectional sizes, and the cross-sectional sizes are, from large to small, the first standard section 1-1, the second standard section 1-2, the third standard section 1-3, the fourth standard section 1-4 and the fifth standard section 1-5; after the tower body is jacked up, the fifth standard section 1-5 is located at the bottom, the first standard section 1-1 is located at the top, a first oil cylinder 1-6 is provided between the first standard section 1-1 and the third standard section 1-3, a second oil cylinder 1-7 is provided between the third standard section 1-3 and the fifth standard section 1-5, and the first oil cylinder 1-6 and the second oil cylinder 1-7 are alternately arranged.
[0049] like Figure 3-4 As shown, two layers of second friction blocks 1-1-1 are provided at the bottom of the first standard section 1-1, and the second friction blocks 1-1-1 are in contact with the outer side of the main chord of the second standard section 1-2, so that the tower body can be lifted more smoothly; a joint 1-2-1 is provided on the main chord of the second standard section 1-2, and after being lifted into place, the second friction block 1-1-1 abuts against the bottom of the joint 1-2-1, serving as a mechanical limit when the tower body is fully extended, ensuring that the inner and outer layer pin holes can be aligned when the tower body is pushed out, so as to facilitate the pin to be pushed out. The second friction block 1-1-1 is connected to the friction block seat by bolts, and the friction block seat is connected to the main chord of the first standard section 1-1 by bolts. The friction block seat can be taken out and installed only on the outer side of the tower body, and the assembly and disassembly is convenient and quick.
[0050] like Fig. 9As shown, the main material of the first standard section 1-1 is angle steel, and the upper and lower layers are each provided with 4 pin holes. The upper pin holes are connected to the second standard section 1-2 after the tower body is retracted, and the lower pin holes are connected to the second standard section 1-2 after the tower body is extended; a lifting cylinder seat is welded on the top of the first standard section 1-1 to facilitate the lifting and retraction of the tower body. The top of the tower body can be used as a pump station platform to provide power for the lifting of the first cylinder 1-6.
[0051] like Fig.11 As shown, the main material of the second standard section 1-2 is angle steel, and the upper layer of the second standard section 1-2 has four joints 1-2-1. The joints 1-2-1 have two pin holes. The upper pin hole is connected to the first standard section 1-1 after the tower body is extended, and the lower pin hole is connected to the third standard section 1-3 after the tower body is contracted.
[0052] like Fig.12 As shown, a pin pushing device 5 is installed on the transverse web rod at the upper end of the second standard section 1-2. The pin pushing device 5 is provided with a pushing cylinder 5-2 and a locking pin 5-1 located at one end of the pushing cylinder 5-2. The rear end of the locking pin 5-1 has a connecting groove 5-1-1, and one end of a connecting block 5-1-2 is clamped in the connecting groove 5-1-1. The other end of one end of the connecting block 5-1-2 is connected to the piston rod head of the pushing cylinder 5-1, which makes the locking pin 5-1 easier to install and disassemble. At the same time, it is no longer necessary to manually push the pin shaft, thereby reducing the use of manpower.
[0053] like Fig.13 As shown, the main material of the third standard section 1-3 is angle steel, and 4 connectors connected to the second standard section 1-2 are welded on the top. The upper end of the third standard section 1-3 is provided with a detachable multi-stage cylinder clamp 1-3-1, and the multi-stage cylinder clamp 1-3-1 is connected to the cross beam on the upper part of the third standard section 1-3 by bolts. The outer side of the multi-stage cylinder clamp 1-3-1 is provided with a first cylinder connecting ear plate 1-3-2 and the back side is provided with a second cylinder connecting ear plate 1-3-3. The first cylinder 1-6 is connected between the lifting cylinder seat of the first standard section 1-1 and the first cylinder connecting ear plate 1-3-2; the fourth standard section 1-4 is similar in structure to the second standard section 1-2, and the cross-sectional size is smaller than the second standard section 1-2. The pin shaft of the fourth standard section 1-4 is connected to the third standard section 1-3 and the fifth standard section 1-5.
[0054] like Fig.14 As shown, the main material of the fifth standard section 1-5 is a square steel pipe, and the top end has four L-shaped joints 1-5-1 connected to the fourth standard section 1-4. A lower cylinder ear plate 1-5-2 is welded at the bottom cross beam of the fifth standard section 1-5, and the second cylinder 1-7 is connected between the lower cylinder ear plate 1-5-2 and the second cylinder connecting ear plate 1-3-3.
[0055] like Fig.10As shown, the crossbeam frame 2 is a detachable structure, including a crossbeam 2-1 welded to both sides of the bottom of the first standard section 1-1 and two half frames 2-2 connected to both ends of the crossbeam 2-1 through a pin shaft; a scissor-type connecting ear plate 2-3 connected to the scissor-type lifting mechanism 3 is provided in the middle of the half frame 2-2, which is convenient for the installation and removal of the scissor-type lifting mechanism 3. When installing the scissor-type lifting mechanism 3, it can be pre-assembled with the lifting sleeve 4 and the crossbeam half frame 2-2, and hoisted from top to bottom to both sides of the crossbeam welded on the first standard section 1-1, and finally the half frame 2-2 and the crossbeam 2-1 are connected together through a pin shaft.
[0056] like Figure 5-6 As shown, the bottom of the scissor lift mechanism 3 is connected to the crossbeam frame 2 at the bottom of the first standard section 1-1 through an ear plate; the scissor lift mechanism 3 includes a left scissor assembly and a right scissor assembly, and the left scissor assembly and the right scissor assembly are connected and move synchronously through a connecting rod; the scissor lift mechanism 3 includes short scissor arms 3-1 located at the bottom and the top and a plurality of long scissor arms 3-2 located in the middle, and an adjusting cylinder 3-3 is provided between the short scissor arms 3-1 at the bottom and the short scissor arms 3-1 at the top; the top of the scissor lift mechanism 3 is connected to the outer frame of the lifting frame 4 through an ear plate.
[0057] like Figure 7-8 As shown, the lifting frame 4 includes an inner frame 4-2 and an outer frame 4-3, an ear plate connected to the scissor lift mechanism 3 is welded on the outer frame 4-3, and two layers of first friction blocks 4-1 are welded on the inner side of the inner frame 4-2. The first friction block 4-1 is in contact with the main chord rod outside the first standard section 1-1 to ensure the verticality of the scissor lift mechanism 3 when it is extended, prevent the scissor lift mechanism 3 from deflecting when it is extended, and ensure that the scissor lift mechanism 3 can operate stably when it is lifted; an equipment platform 4-4 is provided on one side above the lifting frame 4, which can be used to install and place pump stations, The electric control box, etc., the pump station can provide power for the extension and retraction of the oil cylinder of the scissor lift mechanism 3. The equipment platform 4-4 is installed on the transverse rod of the lifting sleeve 4 through a pin; the inner cross bar of the outer frame 4-3 is welded with a scissor ear plate seat 4-3-1, and the scissor ear plate seat 4-3-1 is connected to the upper part of the scissor lift mechanism 3 through a pin; the inner frame 4-2 and the outer frame 4-3 are provided with transverse connecting ear plates, and the lifting platform is connected to the transverse connecting ear plates. The extension and retraction of the scissor lift mechanism 3 and the tower body can drive the lifting platform to rise and fall, thereby realizing the stepless rise and fall of the platform.
[0058] The above are only preferred embodiments of the present invention. The protection scope of the present invention shall be based on the scope defined by the claims. Several improvements and modifications made by those skilled in the art without departing from the spirit and scope of the present invention should also be regarded as the protection scope of the present invention.
Claims
1. A steplessly adjustable lifting device, characterized in that: include: The telescopic tower body (1) comprises a plurality of standard sections which are sequentially sleeved and a cylinder for driving the standard sections to be lifted; A crossbeam frame (2) is arranged on the outermost standard section; A scissor lift mechanism (3), one end of which is arranged on the crossbeam frame (2); The lifting sleeve (4) is connected to the other end of the scissor lift mechanism (3) and comprises a plurality of first friction blocks (4-1) which abut against the standard joints and guide the lifting of the scissor lift mechanism (3).
2. The steplessly adjustable lifting device according to claim 1 is characterized in that: The telescopic tower body (1) comprises five tower body sections with different cross-sectional sizes, wherein the cross-sectional sizes are, from large to small, a first standard section (1-1), a second standard section (1-2), a third standard section (1-3), a fourth standard section (1-4) and a fifth standard section (1-5); the first standard section (1-1) is located at the top; a first oil cylinder (1-6) is arranged between the first standard section (1-1) and the third standard section (1-3); a second oil cylinder (1-7) is arranged between the third standard section (1-3) and the fifth standard section (1-5); and the first oil cylinder (1-6) and the second oil cylinder (1-7) are arranged alternately.
3. The steplessly adjustable lifting device according to claim 2 is characterized in that: Two layers of second friction blocks (1-1-1) are provided at the bottom of the first standard section (1-1), the second friction blocks (1-1-1) are in contact with the outer side of the main chord of the second standard section (1-2), a joint (1-2-1) is provided on the main chord of the second standard section (1-2), and after being lifted into place, the second friction blocks (1-1-1) are against the bottom of the joint (1-2-1).
4. The steplessly adjustable lifting device according to claim 2, characterized in that: The main material of the first standard section (1-1) is angle steel, and the upper and lower layers are each provided with 4 pin holes. The upper layer of pin holes is connected to the second standard section (1-2) after the tower body is contracted, and the lower layer of pin holes is connected to the second standard section (1-2) after the tower body is extended. A lifting cylinder seat is welded on the top of the first standard section (1-1).
5. The steplessly adjustable lifting device according to claim 4, characterized in that: The main material of the second standard section (1-2) is angle steel. The upper layer of the second standard section (1-2) has four joints (1-2-1). The joints (1-2-1) have two pin holes. The upper pin hole is connected to the first standard section (1-1) after the tower body is extended, and the lower pin hole is connected to the third standard section (1-3) after the tower body is retracted.
6. The steplessly adjustable lifting device according to claim 5, characterized in that: A pin-shaft pushing device (5) is installed on the transverse web at the upper end of the second standard section (1-2). The pin-shaft pushing device (5) is provided with a pushing oil cylinder (5-2) and a locking pin (5-1) located at one end of the pushing oil cylinder (5-2). The rear end of the locking pin (5-1) has a connecting groove (5-1-1), and one end of a connecting block (5-1-2) is clamped in the connecting groove (5-1-1). One end of the connecting block (5-1-2) and the other end are connected to the piston rod head of the pushing oil cylinder (5-2).
7. The steplessly adjustable lifting device according to claim 6, characterized in that: The main material of the third standard section (1-3) is angle steel, and four connectors connected to the second standard section (1-2) are welded on the top. The upper end of the third standard section (1-3) is provided with a detachable multi-stage oil cylinder clamp (1-3-1), and the multi-stage oil cylinder clamp (1-3-1) is connected to the cross beam at the upper part of the third standard section (1-3) by bolts. The outer side of the multi-stage oil cylinder clamp (1-3-1) is provided with a first oil cylinder connecting ear plate (1-3-2) and the back side is provided with a second oil cylinder connecting ear plate (1-3-3). The first oil cylinder (1-6) is connected between the lifting cylinder seat of the first standard section (1-1) and the first cylinder connecting ear plate (1-3-2); the fifth standard section (1-5) is made of square steel pipe as the main material, and has four L-shaped joints (1-5-1) connected to the fourth standard section (1-4) at the top; a lower cylinder ear plate (1-5-2) is welded at the bottom cross beam of the fifth standard section (1-5), and the second cylinder (1-7) is connected between the lower cylinder ear plate (1-5-2) and the second cylinder connecting ear plate (1-3-3).
8. The steplessly adjustable lifting device according to claim 2, characterized in that: The crossbeam frame (2) is a detachable structure, comprising a crossbeam (2-1) welded to both sides of the bottom of the first standard section (1-1) and two half frames (2-2) connected to both ends of the crossbeam (2-1) via a pin shaft; a scissor-fork connecting ear plate (2-3) connected to a scissor-fork lifting mechanism (3) is provided in the middle of the half frame (2-2).
9. The steplessly adjustable lifting device according to claim 2, characterized in that: The bottom of the scissor lift mechanism (3) is connected to the crossbeam frame (2) at the bottom of the first standard section (1-1) through an ear plate; the scissor lift mechanism (3) comprises a left scissor assembly and a right scissor assembly, and the left scissor assembly and the right scissor assembly are connected and move synchronously through a connecting rod; the scissor lift mechanism (3) comprises short scissor arms (3-1) located at the bottom and the top and a plurality of long scissor arms (3-2) located in the middle, and an adjusting cylinder (3-3) is provided between the short scissor arms (3-1) at the bottom and the short scissor arms (3-1) at the top; the top of the scissor lift mechanism (3) is connected to the outer frame of the lifting frame (4) through an ear plate.
10. The steplessly adjustable lifting device according to claim 2, characterized in that: The lifting frame (4) comprises an inner frame (4-2) and an outer frame (4-3); an ear plate connected to the scissor lift mechanism (3) is welded on the outer frame (4-3); upper and lower first friction blocks (4-1) are welded on the inner side of the inner frame (4-2); the first friction blocks (4-1) are in contact with the main chord rod outside the first standard section (1-1); an equipment platform (4-4) is provided on one side above the lifting frame (4); the equipment platform (4-4) is installed on the transverse web of the lifting frame (4) through a pin shaft; a scissor ear plate seat (4-3-1) is welded on the inner transverse bar of the outer frame (4-3); the scissor ear plate seat (4-3-1) is connected to the upper part of the scissor lift mechanism (3) through a pin shaft; the inner frame (4-2) and the outer frame (4-3) are provided with transverse connecting ear plates, and the lifting platform is connected to the transverse connecting ear plates.