Full-automatic large plate lifting equipment

Abstract

Full-automatic large plate lifting equipment relates to the technical field of hoisting mechanical equipment and comprises a horizontal conveying assembly, a hoisting assembly is fixedly mounted on the horizontal conveying assembly and comprises a supporting assembly, a positioning assembly is movably mounted at the top of the supporting assembly, and an angle adjusting assembly is rotatably mounted on the front face of the positioning assembly; the supporting assembly comprises a sleeve, a jacking air cylinder is fixedly installed on the inner side of the sleeve, and the jacking air cylinder is fixedly connected with the bottom of the positioning assembly. The positioning assembly comprises a vertical rod, an upper support is fixedly installed on the top of the vertical rod, a lower support is fixedly installed on the lower portion of the vertical rod, the angle adjusting assembly is rotationally installed between the upper support and the lower support, and a stepping motor is fixedly installed on one side of the vertical rod. The angle adjusting assembly comprises a rotating shaft which is in transmission installation with a stepping motor. And a material transferring assembly is mounted on the angle adjusting assembly. The problems that in the prior art, the structural damage risk is high, space adaptability is poor, installation and adjustment are difficult, and stability and safety are insufficient can be effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of lifting mechanical equipment, in particular to a fully automatic large-scale plate lifting device. Background Art

[0002] When constructing inside a floor, whether it is an office building or a residential building, it is often necessary to lift panels or other heavy materials. However, for many small and medium-sized enterprises or decoration teams, it is neither economical nor practical to install permanent equipment such as large elevators or heavy gantry cranes between floors. Some units may try to install rail-mounted lifting systems, but these systems are also limited by their track coverage and cannot operate in areas outside the track. Although the use of vehicle-mounted lifting platforms provides flexibility, it requires sufficient space for vehicles to enter and exit and operate, which is often difficult to achieve inside floors, especially in high-rise or compact environments. In addition, the purchase and maintenance of such vehicle-mounted equipment is also a considerable burden for companies with limited resources.

[0003] CN107720564A discloses a small mechanical cantilever crane which can rotate and move laterally, comprising a supporting column, a rotating beam, a traveling bracket and a lifting mechanism. The supporting column is placed vertically, the lower end of the supporting column is fixedly connected to the foundation by anchor bolts, the upper end of the supporting column has a vertical rotating shaft, a rotating shaft sleeve is installed outside the rotating shaft, the rotating shaft sleeve and the rotating shaft are in rotational cooperation, the outer wall of the rotating shaft sleeve is welded to one end of the rotating beam in the horizontal direction, the traveling bracket is placed vertically, the upper part of the traveling bracket is connected to the rotating beam, the lower end of the traveling bracket is installed with a universal caster, the lifting mechanism is installed on the rotating beam, and the lifting mechanism has a roller which is in rolling cooperation with the rotating beam.

[0004] When the device in the existing technology is in use, it can make 360-degree rotation and lateral movement during the lifting process, easily realizing the displacement of the hoisted object between any two points within a certain range, which can make up for the defect that large lifting equipment such as overhead cranes are not suitable for lifting small parts, and improve the work efficiency of the production site.

[0005] However, in actual use, the above-mentioned device needs to be fixed on the ground, and when performing indoor construction, the positioning of the openings on the ground or ceiling is likely to cause damage to the structure of the house. Secondly, although the above-mentioned device realizes the rotation of the rotating beam through a walking bracket, the installation and adjustment of the walking bracket becomes extremely difficult when the space of the actual construction site is limited, which greatly limits the flexibility and applicability of the equipment. In addition, due to space limitations, the stability and safety of the equipment may also be affected, increasing the risks and uncertainties in the construction process. In summary, when the above-mentioned device is used for indoor construction, there are problems such as high risk of structural damage, poor spatial adaptability, difficulty in installation and adjustment, and insufficient stability and safety. To this end, a fully automatic large-scale plate lifting device is proposed to solve the above problems. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a fully automatic large-scale plate lifting equipment that can effectively solve the problems of high risk of structural damage, poor spatial adaptability, difficult installation and adjustment, and insufficient stability and safety in the background technology.

[0007] The technical solution adopted by the present invention to solve its technical problems is: a fully automatic large-scale plate lifting equipment, including a horizontal conveying component, a lifting component is fixedly installed on the horizontal conveying component, the lifting component includes a supporting component, a positioning component is movably installed on the top of the supporting component, and an angle adjustment component is rotatably installed on the front of the positioning component; the supporting component includes a sleeve, a lifting cylinder is fixedly installed on the inner side of the sleeve, and the top of the lifting cylinder is fixedly connected to the bottom of the positioning component; the positioning component includes a vertical pole, the bottom of the vertical pole is fixedly connected to the top of the lifting cylinder, an upper bracket is fixedly installed on the top of the vertical pole, a lower bracket is fixedly installed on the lower part of the vertical pole, the angle adjustment component is rotatably installed between the upper bracket and the lower bracket, and a stepping motor is fixedly installed on one side of the vertical pole; the angle adjustment component includes a rotating shaft, the rotating shaft is transmission-mounted with the stepping motor, and the rotating shaft is installed parallel to the vertical pole; a material transfer component is installed on the angle adjustment component.

[0008] Furthermore, the horizontal conveying assembly includes a frame, a push frame is fixedly installed at the rear end of the top of the frame, a positioning cylinder is fixedly installed in the middle of the bottom of the frame, a support plate is fixedly installed at the bottom of the positioning cylinder, wheels are fixedly installed on both sides of the bottom of the frame respectively, and a positioning frame is fixedly installed at the rear end of the bottom of the frame.

[0009] Furthermore, the lifting assembly also includes a base, the bottom of the base is fixedly installed in the middle of the upper end surface of the frame, the installation position of the base matches the installation position of the positioning cylinder, and the bottom of the lifting cylinder is fixedly connected to the middle of the top of the base.

[0010] Furthermore, the inner diameter of the sleeve matches the outer diameter of the pole, the bottom of the pole is movably inserted into the inner side of the top of the sleeve, and the telescopic end of the lifting cylinder moves vertically along the inner wall of the sleeve to ensure that the pole can be lifted and lowered smoothly and stably along the installation direction of the sleeve.

[0011] Furthermore, a transmission gear is installed on the stepper motor, a driven gear is fixedly installed on the middle section of the rotating shaft and is installed with the transmission gear through a chain transmission, a first connecting seat is fixedly installed on the top of the rotating shaft, a mounting seat is fixedly installed on the lower part of the rotating shaft, and a material transfer assembly is fixedly installed on the rotating shaft through the mounting seat.

[0012] Furthermore, a pull rod is movably mounted on the first connecting seat, and tighteners are respectively threadedly mounted on both ends of the pull rod, and one end of the pull rod is movably mounted on the first connecting seat through the tightener.

[0013] Furthermore, the material transfer assembly includes a crossbeam, a second connecting seat is fixedly installed on one end of the upper end surface of the crossbeam facing away from the angle adjustment assembly, the second connecting seat is movably installed with the other end of the pull rod through a tightener, a crane is movably installed on the crossbeam, the crane can move freely on the crossbeam, and an electric hoist is fixedly installed on the bottom of the crane.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The invention avoids direct opening of holes in the ground or ceiling for positioning through the mobility of the horizontal conveying assembly, thereby reducing the risk of damage to the building structure. The design of the lifting assembly allows the equipment to be operated without directly relying on ground or ceiling fixing points, further reducing dependence on the building structure and potential damage.

[0015] The frame and wheel design of the horizontal conveying component enables the equipment to move flexibly in different spaces and adapt to various construction environments. The support component and positioning component of the lifting component realize flexible adjustment in the vertical direction through the design of the jacking cylinder and sleeve, which increases the adaptability of the equipment to spaces of different heights. The coordinated use of the angle adjustment component and the material transfer component enables the equipment to be flexibly adjusted in the horizontal direction, further improving the spatial adaptability.

[0016] The equipment is designed in a modular way, such as the fixed installation of the lifting assembly and the horizontal conveying assembly, and the flexible connection of the internal components of the lifting assembly, making the installation and adjustment of the equipment relatively simple. The design of the stepper motor, transmission gear and driven gear enables precise control of the angle adjustment assembly and simplifies the angle adjustment process. The use of the positioning cylinder and the support plate ensures the precise positioning of the equipment in the working area to prevent shaking or displacement. The lifting cylinder provides strong vertical stability, ensuring that the material can be lifted and moved safely and stably. The use of the pull rod and the tightener, as well as the stable lifting capacity of the crane and the electric hoist, further enhance the stability and safety of the equipment.

[0017] In summary, the fully automatic large-scale plate lifting equipment effectively solves multiple problems mentioned in the background technology through its unique design and component configuration, and improves the flexibility, applicability, stability and safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view of an embodiment of the present invention; Figure 2 for Figure 1 A bottom view of the horizontal conveyor assembly of the illustrated embodiment; Figure 3 for Figure 1 A schematic diagram of the structure of the hoisting assembly of the illustrated embodiment; Figure 4 for Figure 1 A schematic diagram of the structure of the support assembly of the illustrated embodiment; Figure 5 for Figure 1 A schematic diagram of the structure of the positioning assembly of the illustrated embodiment; Figure 6 for Figure 1 A schematic diagram of the structure of the angle adjustment assembly of the illustrated embodiment; Figure 7 for Figure 1 A schematic diagram of the structure of the material transfer assembly of the illustrated embodiment; Description of reference numerals in the figures: 1. Horizontal conveying assembly; 11. Frame; 111. Positioning frame; 112. Wheel; 12. Push frame; 13. Positioning cylinder; 131. Support plate; 2. Hoisting assembly; 21. Support assembly; 211. Base; 212. Casing; 213. Lifting cylinder; 22. Positioning assembly; 221. Vertical pole; 2211. Upper bracket; 2212. Lower bracket; 222. Stepper motor; 2221. Transmission gear; 23. Angle adjustment assembly; 231. Rotating shaft; 2311. Driven gear; 2312. First connecting seat; 23121. Tightener; 2313. Pull rod; 2314. Mounting seat; 24. Material transfer assembly; 241. Crossbeam; 2411. Second connecting seat; 242. Crane; 243. Electric hoist. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Reference Figures 1 to 7 A fully automatic large-scale plate lifting device comprises a horizontal conveying component 1, on which a hoisting component 2 is fixedly installed, and the hoisting component 2 comprises a supporting component 21, on which a positioning component 22 is movably installed on the top of the supporting component 21, and an angle adjustment component 23 is rotatably installed on the front of the positioning component 22; the supporting component 21 comprises a sleeve 212, on the inner side of which a lifting cylinder 213 is fixedly installed, and the top of the lifting cylinder 213 is fixedly connected to the bottom of the positioning component 22; the positioning component 22 comprises a vertical rod 221, and the bottom of the vertical rod 221 is fixedly connected to the bottom of the positioning component 22. The upper part of the vertical pole 221 is fixedly connected to the top of the lifting cylinder 213, an upper bracket 2211 is fixedly installed on the top of the vertical pole 221, and a lower bracket 2212 is fixedly installed on the lower part of the vertical pole 221. The angle adjustment component 23 is rotatably installed between the upper bracket 2211 and the lower bracket 2212, and a stepper motor 222 is fixedly installed on one side of the vertical pole 221; the angle adjustment component 23 includes a rotating shaft 231, and the rotating shaft 231 is transmission-mounted with the stepper motor 222, and the rotating shaft 231 is installed parallel to the vertical pole 221; a material transfer component 24 is installed on the angle adjustment component 23.

[0021] Specifically, the horizontal conveying assembly 1 includes a frame 11, a push frame 12 is fixedly installed at the top rear end of the frame 11, a positioning cylinder 13 is fixedly installed in the middle of the bottom of the frame 11, a support plate 131 is fixedly installed at the bottom of the positioning cylinder 13, wheels 112 are fixedly installed on both sides of the bottom of the frame 11, and a positioning frame 111 is fixedly installed at the bottom rear end of the frame 11. The frame 11, as the supporting structure of the entire equipment, can withstand the weight and pressure in the hoisting operation and ensure the stability of the equipment during movement and operation. The setting of the push frame 12 enables the operator or automated equipment to easily push the equipment forward, improving the mobility and convenience of operation of the equipment. The coordinated use of the positioning cylinder 13 and the support plate 131 can ensure the precise positioning of the equipment in the working area, prevent shaking or displacement during the hoisting process, and improve the safety and accuracy of the operation. The design of the wheels 112 enables the equipment to move freely on different grounds, adapt to various construction environments, and improve the applicability and flexibility of the equipment.

[0022] Specifically, the hoisting assembly 2 also includes a base 211, the bottom of the base 211 is fixedly installed in the middle of the upper end surface of the frame 11, the installation position of the base 211 matches the installation position of the positioning cylinder 13, and the bottom of the lifting cylinder 213 is fixedly connected to the middle of the top of the base 211. The installation position of the base 211 matches the positioning cylinder 13, ensuring the stability and accuracy of the equipment when it is fixed. The bottom of the lifting cylinder 213 is fixedly connected to the top of the base 211, providing a strong vertical lifting force for the hoisting operation, ensuring that the material can be safely and stably lifted and moved.

[0023] Specifically, the inner diameter of the sleeve 212 matches the outer diameter of the vertical rod 221, the bottom of the vertical rod 221 is movably inserted into the inner side of the top of the sleeve 212, and the telescopic end of the lifting cylinder 213 moves vertically along the inner wall of the sleeve 212, ensuring that the vertical rod 221 can be smoothly and stably lifted and lowered along the installation direction of the sleeve 212, thereby improving the stability and accuracy of the lifting operation. This design makes the structure of the lifting assembly 2 more compact, reduces the occupied space, and improves the spatial adaptability of the equipment.

[0024] Specifically, the stepper motor 222 serves as the driving core of the angle adjustment component 23, and is firmly fixedly connected to the vertical pole 221 through high-quality mounting screws. The setting of the mounting screws not only ensures the absolute stability of the stepper motor 222 during operation and prevents displacement due to vibration or external force, but also greatly improves the durability and service life of the entire lifting component 2. The stepper motor 222 has the characteristics of high precision, low noise, and strong torque, and can accurately control the rotation speed and angle to meet the angle adjustment requirements under various complex working conditions. The transmission gear 2221 installed on the stepper motor 222 is made of high-quality alloy material with extremely high hardness and wear resistance, which ensures the stability and reliability of the transmission process and extends the service life of the equipment.

[0025] Specifically, a transmission gear 2221 is installed on the stepper motor 222, a driven gear 2311 is fixedly installed on the middle section of the rotating shaft 231 and is installed with the transmission gear 2221 through a chain transmission, a first connecting seat 2312 is fixedly installed on the top of the rotating shaft 231, a mounting seat 2314 is fixedly installed on the lower part of the rotating shaft 231, and a material transfer assembly 24 is fixedly installed on the rotating shaft 231 through the mounting seat 2314. The driven gear 2311 on the rotating shaft 231 and the transmission gear 2221 are installed through a chain transmission, which ensures the accurate transmission of power and improves the accuracy and stability of angle adjustment. The design of the first connecting seat 2312 and the mounting seat 2314 enables the material transfer assembly 24 to be stably installed on the rotating shaft 231, meeting different lifting requirements.

[0026] Specifically, a pull rod 2313 is movably mounted on the first connection seat 2312, and tighteners 23121 are respectively threadedly mounted on both ends of the pull rod 2313. The design of the tightener 23121 allows the operator to adjust the tension of the pull rod 2313 according to actual needs. One end of the pull rod 2313 is movably mounted on the first connection seat 2312 through the tightener 23121. The coordinated use of the pull rod 2313 and the tightener 23121 ensures the stability and accuracy of the material during the hoisting process and prevents the material from shaking or moving. The design of the tightener 23121 allows the operator to disassemble the pull rod 2313 according to actual needs, thereby realizing the overall rapid disassembly and assembly of the material transfer assembly 24, and improving the flexibility and applicability of the equipment.

[0027] Specifically, the material transfer assembly 24 includes a crossbeam 241, and a second connection seat 2411 is fixedly installed on one end of the crossbeam 241, which is away from the angle adjustment assembly 23. The second connection seat 2411 is movably installed with the other end of the pull rod 2313 through a tightener 23121. A crane 242 is movably installed on the crossbeam 241, and the crane 242 can move freely on the crossbeam 241. An electric hoist 243 is fixedly installed at the bottom of the crane 242. The crane 242 can move freely on the crossbeam 241, so that the material can be flexibly and accurately moved in the horizontal direction. The electric hoist 243 is used to lift and move large plates or other materials, and has strong lifting capacity and stability, ensuring the safety and accuracy of the lifting operation. The coordinated use of the crane 242 and the electric hoist 243 enables the material to be flexibly and accurately moved in the horizontal and vertical directions, thereby improving the comprehensive performance and applicability of the equipment.

[0028] When the present invention is used, the fully automatic large-scale plate lifting equipment is moved to the construction area. The frame 11 and the wheel 112 in the horizontal conveying component 1 can be used to easily push the equipment to the designated position. The positioning cylinder 13 and the support plate 131 are used to firmly fix the equipment on the ground to ensure that the equipment will not shake or move during the lifting process. Check whether the various components of the lifting component 2 are firmly installed, and start the jacking cylinder 213 to raise the vertical rod 221 and the positioning component 22 and the angle adjustment component 23 thereon to the initial height to prepare for the subsequent lifting operation, and the positioning cylinder 13 plays a vital role. It uses the support plate 131 to be in close contact with the ground, providing a stable base for the entire equipment. This design not only prevents the equipment from shaking or moving during the lifting process, but also ensures the adaptability and stability of the equipment under different ground conditions. At the same time, the introduction of the jacking cylinder 213 further enhances the stability of the equipment. Before the lifting operation begins, the lifting cylinder 213 is activated to raise the vertical pole 221 and the positioning assembly 22 and angle adjustment assembly 23 thereon to an initial height. When the equipment is positioned between the ceiling and the floor, the synergistic effect of the positioning cylinder 13 and the lifting cylinder 213 ensures the stability of the device in the vertical direction. This design not only improves the safety of the equipment during the lifting process, but also effectively reduces the potential risks caused by shaking or displacement.

[0029] Place the large plate or other material to be hoisted under the crane 242 of the material transfer assembly 24. Start the electric hoist 243 to lift the material and hang it under the crane 242. By controlling the rotation of the stepper motor 222, the rotating shaft 231 in the angle adjustment assembly 23 is driven to rotate, thereby adjusting the direction and angle of the material. In the process of adjusting the material angle, the pull rod 2313 and the tightener 23121 ensure the stability and accuracy of the material during the hoisting process. After the material angle is adjusted, start the crane 242 to allow it to move freely on the beam 241 and translate the material to the specified position. By controlling the lifting and lowering of the electric hoist 243, the material is accurately placed at the target position.

[0030] After the lifting operation is completed, the various components of the lifting assembly 2 are reset to their initial state. In particular, the lifting cylinder 213 needs to be retracted to the lowest position for the next use. Clean up the debris and dust on the equipment to keep the equipment clean and tidy. Check whether the various components of the equipment are damaged or worn, and repair or replace them in time if necessary.

[0031] The present invention avoids directly opening holes on the ground or ceiling for positioning through the mobility of the horizontal conveying assembly 1, thereby reducing the risk of damage to the building structure. The design of the hanging assembly 2 allows the equipment to be operated without directly relying on the ground or ceiling fixing points, further reducing the dependence on the building structure and potential damage.

[0032] The design of the frame 11 and wheels 112 of the horizontal conveying assembly 1 enables the equipment to be flexibly moved in different spaces and adapt to various construction environments. The support assembly 21 and positioning assembly 22 of the hoisting assembly 2 realize flexible adjustment in the vertical direction through the design of the jacking cylinder 213 and the sleeve 212, increasing the adaptability of the equipment to spaces of different heights. The coordinated use of the angle adjustment assembly 23 and the material transfer assembly 24 enables the equipment to be flexibly adjusted in the horizontal direction, further improving the spatial adaptability.

[0033] The equipment adopts modular design, such as the fixed installation of the lifting component 2 and the horizontal conveying component 1, and the flexible connection of the internal components of the lifting component 2, so that the installation and adjustment of the equipment become relatively simple. The design of the stepper motor 222, the transmission gear 2221 and the driven gear 2311 realizes the precise control of the angle adjustment component 23 and simplifies the angle adjustment process. The coordinated use of the positioning cylinder 13 and the support plate 131 ensures the precise positioning of the equipment in the working area to prevent shaking or displacement. The lifting cylinder 213 provides strong vertical stability to ensure that the material can be lifted and moved safely and stably. The coordinated use of the pull rod 2313 and the tightener 23121, as well as the stable lifting capabilities of the crane 242 and the electric hoist 243, further enhance the stability and safety of the equipment.

[0034] In summary, the fully automatic large-scale plate lifting equipment effectively solves multiple problems mentioned in the background technology through its unique design and component configuration, and improves the flexibility, applicability, stability and safety of the equipment.

Claims

1. A fully automatic large-scale board lifting equipment, characterized in that: It includes a horizontal conveying component, on which a lifting component is fixedly installed, the lifting component includes a supporting component, on which a positioning component is movably installed on the top of the supporting component, and on which an angle adjustment component is rotatably installed on the front side of the positioning component; the supporting component includes a sleeve, on the inner side of which a lifting cylinder is fixedly installed, and the top of the lifting cylinder is fixedly connected to the bottom of the positioning component; the positioning component includes a vertical pole, on which the bottom of the vertical pole is fixedly connected to the top of the lifting cylinder, an upper bracket is fixedly installed on the top of the vertical pole, and a lower bracket is fixedly installed on the lower part of the vertical pole, the angle adjustment component is rotatably installed between the upper bracket and the lower bracket, and a stepper motor is fixedly installed on one side of the vertical pole; the angle adjustment component includes a rotating shaft, which is transmission-mounted with the stepper motor, and the rotating shaft is installed parallel to the vertical pole; a material transfer component is installed on the angle adjustment component.

2. The fully automatic large-scale board lifting equipment according to claim 1 is characterized in that: The horizontal conveying assembly includes a frame, a push frame is fixedly installed at the rear end of the top of the frame, a positioning cylinder is fixedly installed in the middle of the bottom of the frame, a support plate is fixedly installed at the bottom of the positioning cylinder, wheels are fixedly installed on both sides of the bottom of the frame respectively, and a positioning frame is fixedly installed at the rear end of the bottom of the frame.

3. The fully automatic large-scale board lifting equipment according to claim 2 is characterized in that: The hoisting assembly also includes a base, the bottom of the base is fixedly installed in the middle of the upper end surface of the frame, the installation position of the base matches the installation position of the positioning cylinder, and the bottom of the lifting cylinder is fixedly connected to the middle of the top of the base.

4. The fully automatic large-scale board lifting equipment according to claim 1, 2 or 3, characterized in that: The inner diameter of the sleeve matches the outer diameter of the pole, the bottom of the pole is movably inserted into the inner side of the top of the sleeve, and the telescopic end of the lifting cylinder moves vertically along the inner wall of the sleeve to ensure that the pole can be lifted and lowered smoothly and stably along the installation direction of the sleeve.

5. The fully automatic large-scale board lifting equipment according to claim 1, 2 or 3, characterized in that: A transmission gear is installed on the stepper motor, a driven gear is fixedly installed on the middle section of the rotating shaft and is installed with the transmission gear through a chain transmission, a first connecting seat is fixedly installed on the top of the rotating shaft, a mounting seat is fixedly installed on the lower part of the rotating shaft, and a material transfer component is fixedly installed on the rotating shaft through the mounting seat.

6. The fully automatic large-scale board lifting equipment according to claim 5 is characterized in that: A pull rod is movably mounted on the first connecting seat, and tighteners are respectively threadedly mounted on both ends of the pull rod. One end of the pull rod is movably mounted on the first connecting seat through the tightener.

7. The fully automatic large-scale board lifting equipment according to claim 6 is characterized in that: The material transfer assembly includes a crossbeam, a second connecting seat is fixedly installed on one end of the upper end surface of the crossbeam facing away from the angle adjustment assembly, the second connecting seat is movably installed with the other end of the pull rod through a tightener, a crane is movably installed on the crossbeam, the crane can move freely on the crossbeam, and an electric hoist is fixedly installed on the bottom of the crane.

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