Guide wheel lifting suspended ceiling device of assembly type steel structure corridor
By designing a guide wheel lifting ceiling device, the combination of a lifting table, adjustment table, sliding table and weight adjustment mechanism is used to solve the problems of cumbersome lifting operations, inconvenient direction adjustment and unstable center of gravity in the prefabricated steel corridor, flexible lifting, direction adjustment and center of gravity adjustment, and construction safety and efficiency are improved.
Patent Information
- Application Number
- CN202510308456.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2025-05-23
AI Technical Summary
During the construction of the prefabricated steel structure corridor, due to the different sizes of the assembly parts and the different assembly positions and directions, the lifting operation is complicated, the direction adjustment is inconvenient, and the center of gravity is prone to unstable, which poses certain dangers.
A guide wheel lifting ceiling device is designed, including a lifting table, a adjustment table, a sliding table and a weight adjustment mechanism. It is connected to the steel structure corridor through the hooks on the sliding table. The movement of the sliding table is used to adjust the hook position. The rotationality between the lifting table and the adjustment table changes the direction of the steel structure corridor, and the center of gravity is adjusted through the weight adjustment mechanism to ensure the stability of the lifting.
It realizes flexible lifting of steel structure corridors of different sizes, facilitates direction adjustment, avoids unstable center of gravity, and improves the safety and efficiency of lifting.
Smart Images

Figure CN120024795A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of suspended ceiling equipment, in particular to a guide wheel lifting suspended ceiling device for an assembled steel structure corridor. Background Art
[0002] Prefabricated steel corridor is a kind of prefabricated component widely used in modern buildings. It improves construction efficiency, reduces costs and has good environmental performance through factory production and rapid on-site assembly. However, there are still the following shortcomings in the construction process of prefabricated steel corridor: 1. Since the sizes of the assemblies of different steel structure corridors are different, when hoisting different accessories, they need to be hoisted according to different assemblies, which is cumbersome; 2. Since the assembly position and direction of the steel structure corridor are different, it is inconvenient to adjust its direction during the hoisting process; The center of gravity of the steel structure corridor is prone to instability during the hoisting process, which makes it dangerous. Summary of the invention
[0003] In order to solve the problems raised in the above-mentioned background technology, the present invention provides a guide wheel lifting ceiling device for an assembled steel structure corridor, which is mainly used to solve the problem that the assembly parts of different steel structure corridors are of different sizes. Therefore, when lifting different accessories, it is necessary to lift them according to different assembly parts, which is cumbersome to operate. Since the assembly positions and directions of the steel structure corridors are different, it is inconvenient to adjust their directions during the lifting process. The steel structure corridor is prone to unstable center of gravity during the lifting process, which is dangerous.
[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a guide wheel lifting ceiling device for an assembled steel structure corridor, comprising a crane, a telescopic arm is provided on one side of the crane, a retractable lifting rope is provided at one end of the telescopic arm, a lifting wheel is installed at the bottom of the lifting rope, a plurality of steel wire ropes 1 are connected to the bottom of the lifting wheel through a steel wire rope joint, the bottom ends of the plurality of steel wire ropes 1 are connected to a hanging platform through a steel wire rope joint, the plurality of steel wire ropes 1 are respectively located at the four corners of the hanging platform, a mounting hole is opened on the upper surface of the hanging platform, and a connecting shaft is rotatably connected to the mounting hole through a bearing; An adjusting platform is welded to the bottom end of the connecting shaft, and a power assembly for driving the adjusting platform to rotate is provided on the upper surface of the hanging platform. Steel wire ropes 2 are connected to the four corners of the bottom of the adjusting platform through steel wire rope joints, and the bottom ends of multiple steel wire ropes 2 are connected to a hanger through steel wire rope joints. Two guide rods are welded to the bottom of the hanger, and two slides are slidably connected to the outer sides of the two guide rods. Hooks are provided at the bottom of the two slides, and a locking mechanism for fixing the slides is provided at the top of the hanger. A weight adjustment mechanism for changing the center of gravity of the steel structure corridor is provided at the bottom of the adjusting platform.
[0005] Preferably, the power assembly includes a mounting frame 1, the mounting frame 1 is fixed to the upper surface of the hanging platform by bolts, and a reduction motor 1 is fixed in the mounting frame 1 by bolts; One end of the output shaft of the reduction motor passes through a mounting frame and is connected to a driving gear through a coupling. The top end of the connecting shaft is connected to a toothed disc, and the toothed disc is meshed with the driving gear. The diameter of the driving gear is smaller than the diameter of the toothed disc.
[0006] Preferably, a connecting disk is welded to the circumferential outer wall of the connecting shaft below the gear disk, a plurality of steel balls are rollingly connected to the bottom of the connecting disk, an annular groove is provided on the upper surface of the hanging platform, and the plurality of steel balls roll along the annular groove to support the connecting shaft.
[0007] Preferably, the locking mechanism comprises a plurality of limit grooves, the plurality of limit grooves are evenly and symmetrically opened on the upper surface of the hanger, both sides of the slide are provided with slide grooves with open tops, two adjacent slide grooves are slidably connected with a clamping frame, and the clamping frame is located on the upper surface of the hanger and clamped with the limit grooves; A magnetic block is bonded to the bottom of the slide slot, and the magnetic block is adsorbed to the card frame to fix the card frame.
[0008] Preferably, the weight adjustment mechanism comprises a limit rail, the limit rail is fixed to the bottom of the adjustment platform by bolts, a turntable is rotatably connected in the limit rail, and a connecting plate is fixed to the bottom of the turntable by bolts; A track is fixed to the bottom of the connecting plate by bolts, a linear motor is slidably connected to the outer side of the track, a gravity block is fixed to one side of the linear motor by bolts, and a driving component for driving the turntable to rotate is provided at the bottom of the adjusting platform.
[0009] Preferably, the driving assembly includes a second mounting frame, the bottom of the turntable is provided with an annular tooth groove penetrating the turntable, and the second mounting frame passes through the annular tooth groove and is fixed to the bottom of the adjustment platform by bolts.
[0010] Preferably, a reduction motor 2 is fixed to the bottom of the second mounting frame by bolts, one end of the output shaft of the second reduction motor passes through the second mounting frame and is connected to a driving gear 2, and the driving gear 2 extends into the annular tooth groove and meshes with the annular tooth groove.
[0011] Preferably, two guide rails are fixed to the upper surface of the adjustment platform by bolts, and two guide grooves are provided at the bottom of the hanging platform, and the two guide rails slide with the two guide grooves respectively, so that the rotation of the adjustment platform is guided; A plurality of support arms for maintaining the center of gravity of the crane are arranged on the outer side of the crane.
[0012] Compared with the prior art, the present invention has the following beneficial effects: The present invention uses a hanging platform, an adjusting platform, a sliding platform and a weight-adjusting mechanism in coordination, and uses a hook on the sliding platform to connect with a steel structure corridor. Since the sliding platform can move, the position of the hook can be adjusted, so that it is used to hang steel structure corridors of different sizes. After the steel structure corridor is lifted, since the hanging platform and the adjusting platform can be rotated, the direction of the steel structure corridor can be changed during the hanging process, so that the installation of the steel structure corridor is convenient. At the same time, the adjusting mechanism can adjust the center of gravity of the steel structure corridor during hanging, so as to avoid the situation that the center of gravity of the steel structure corridor is unstable during the hanging process, thereby improving the safety of the hanging of the steel structure corridor.
[0013] By setting the locking mechanism of the present invention, after the slide moves to adjust the position of the hook, the position of the slide can be fixed by the locking assembly, thereby preventing the position of the slide from changing and improving the stability of the hook position adjustment.
[0014] The present invention uses a connecting disk and a steel ball in combination, installs the connecting disk on the connecting shaft, and allows the steel ball to roll along the annular groove, which can support the connecting shaft while not increasing the friction force of the connecting shaft rotation, thereby making the connection between the adjusting platform and the hanging platform more stable.
[0015] The present invention provides a support arm, and when the crane is in use, the support arm is extended to contact the ground, so that the support arm supports the crane, thereby preventing the crane from tilting due to an unstable center of gravity when hoisting a steel structure corridor, and improving the stability of the crane in use. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 A schematic diagram of the three-dimensional structure of a guide wheel lifting ceiling device for an assembled steel structure corridor proposed by the present invention; Figure 2 This is an enlarged structural schematic diagram of a hanger of a guide wheel lifting ceiling device of an assembled steel structure corridor proposed by the present invention; Figure 3This is an enlarged structural schematic diagram of part A of a guide wheel lifting ceiling device for an assembled steel structure corridor proposed by the present invention; Figure 4 A schematic diagram of the rotation of an adjusting platform of a guide wheel lifting ceiling device of an assembled steel structure corridor proposed by the present invention; Figure 5 This is a schematic diagram of the enlarged structure of part B of a guide wheel lifting ceiling device for an assembled steel structure corridor proposed by the present invention; Figure 6 A schematic diagram of the bottom structure of a hanger of a guide wheel lifting ceiling device of an assembled steel structure corridor proposed by the present invention; Figure 7 This is a partially enlarged structural schematic diagram of a guide wheel lifting ceiling device for an assembled steel structure corridor proposed by the present invention.
[0017] In the figure: 1. crane; 2. telescopic arm; 3. lifting rope; 4. lifting wheel; 5. hanging frame; 6. supporting arm; 7. wire rope 1; 8. hanging platform; 9. locking mechanism; 10. hook; 11. slide; 12. guide rod; 13. wire rope 2; 14. adjustment platform; 15. weight adjustment mechanism; 16. connecting shaft; 17. gear plate; 18. connecting plate; 19. steel ball; 20. bearing; 21. ring groove; 22. Mounting frame one; 23, reduction motor one; 24, driving gear one; 25, guide groove; 26, guide rail; 27, limit groove; 28, bracket; 29, magnetic block; 30, slide groove; 31, limit rail; 32, turntable; 33, linear motor; 34, track; 35, connecting plate; 36, gravity block; 38, driving gear two; 39, reduction motor two; 40, mounting frame two; 41, annular tooth groove. DETAILED DESCRIPTION
[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.
[0019] like Figures 1 to 7As shown in the figure, the present invention provides a guide wheel lifting ceiling device for an assembled steel structure corridor, which includes a crane 1. One side of the crane 1 is provided with a telescopic arm 2. One end of the telescopic arm 2 is provided with a retractable lifting rope 3. The bottom of the lifting rope 3 is installed with a lifting wheel 4. The bottom of the lifting wheel 4 is connected with a plurality of first steel ropes 7 through a steel wire rope joint. The bottom ends of the plurality of first steel ropes 7 are connected with a lifting platform 8 through a steel wire rope joint. The plurality of first steel ropes 7 are respectively located at the four corners of the lifting platform 8. An installation hole is opened on the upper surface of the lifting platform 8. A connecting shaft 16 is rotatably connected in the installation hole through a bearing 20. The bottom end of the connecting shaft 16 is welded with an adjusting platform 14. A power assembly for driving the adjusting platform 14 to rotate is arranged on the upper surface of the lifting platform 8. The four corners of the bottom of the adjusting platform 14 are respectively connected with a second steel rope 13 through a steel wire rope joint. The bottom ends of the plurality of second steel ropes 13 are connected with a hanging frame 5 through a steel wire rope joint. Two guide rods 12 are welded at the bottom of the hanging frame 5. Two sliding platforms 11 are slidably connected to the outer sides of the two guide rods 12. Hooks 10 are arranged at the bottoms of the two sliding platforms 11. A locking mechanism 9 for fixing the sliding platforms 11 is arranged at the top of the hanging frame 5. A weight adjusting mechanism 15 for changing the lifting center of gravity of the steel structure corridor is arranged at the bottom of the adjusting platform 14.
[0020] Adopting the above scheme: Through the cooperation of the lifting platform 8, the adjusting platform 14, the sliding platform 11 and the weight adjusting mechanism 15, the hook 10 on the sliding platform 11 can be connected with the steel structure corridor. Due to the mobility of the sliding platform 11, the position of the hook 10 can be adjusted, so as to hoist steel structure corridors of different sizes. After the steel structure corridor is hoisted, since the lifting platform 8 and the adjusting platform 14 can rotate, the direction of the steel structure corridor can be changed during the hoisting process, which is convenient for installing the steel structure corridor. At the same time, the adjusting mechanism can adjust the center of gravity of the steel structure corridor during hoisting, so as to avoid the situation of unstable center of gravity during the hoisting of the steel structure corridor and improve the safety of the hoisting of the steel structure corridor. The setting of the locking mechanism 9 can fix the position of the sliding platform 11 through the locking mechanism 9 after the position of the hook 10 is adjusted by moving the sliding platform 11, so as to avoid the change of the position of the sliding platform 11 and improve the stability of the position adjustment of the hook 10.
[0021] As Figure 3 As shown in the figure, the power assembly includes a first mounting frame 22. The first mounting frame 22 is fixed on the upper surface of the lifting platform 8 by bolts. A first reduction motor 23 is fixed in the first mounting frame 22 by bolts. One end of the output shaft of the first reduction motor 23 passes through the first mounting frame 22 and is connected with a first driving gear 24 through a coupling. The top end of the connecting shaft 16 is connected with a gear disc 17, and the gear disc 17 meshes with the first driving gear 24. The diameter of the first driving gear 24 is smaller than the diameter of the gear disc 17.
[0022] By adopting the above scheme, when the reduction motor 23 is running, the driving gear 24 will be driven to rotate through the coupling at one end of its output end, and then the driving gear 24 will drive the gear plate 17 meshing with it to rotate accordingly, thereby realizing the subsequent rotation operation of the gear plate 17.
[0023] like Figure 3 As shown, a connecting disk 18 is welded to the circumferential outer wall of the connecting shaft 16 below the toothed disk 17, and a plurality of steel balls 19 are rollingly connected to the bottom of the connecting disk 18. An annular groove 21 is provided on the upper surface of the hanging platform 8, and the plurality of steel balls 19 roll along the annular groove 21 to support the connecting shaft 16.
[0024] The above scheme is adopted: through the mutual cooperation of the connecting disk 18, multiple steel balls 19 and the annular groove 21, while the connecting shaft 16 is stably supported, when the toothed disk 17 is passively rotated, the connecting shaft 16 stuck in its center position will move synchronously, and the connecting shaft 16 will drive the connecting disk 18 to move. Through the corresponding cooperation of multiple steel balls 19 and the annular groove 21, the smoothness of the rotation of the toothed disk 17, the connecting shaft 16 and the connecting disk 18 is improved, and the friction is reduced. The connecting shaft 16 can be supported without increasing the friction of the rotation of the connecting shaft 16, thereby making the connection between the adjustment platform 14 and the hanging platform 8 more stable.
[0025] like Figures 5 to 7 As shown, the locking mechanism 9 includes a plurality of limit grooves 27, and the plurality of limit grooves 27 are evenly and symmetrically opened on the upper surface of the hanger 5. Both sides of the slide 11 are provided with top-open slide grooves 30, and a bracket 28 is slidably connected in two adjacent slide grooves 30, and the bracket 28 is located on the upper surface of the hanger 5 and is clamped with the limit groove 27. A magnetic block 29 is bonded to the bottom of the slide groove 30, and the magnetic block 29 and the bracket 28 are adsorbed to fix the bracket 28.
[0026] The weight adjustment mechanism 15 includes a limit rail 31, which is fixed to the bottom of the adjustment platform 14 by bolts. A turntable 32 is rotatably connected inside the limit rail 31. A connecting plate 35 is fixed to the bottom of the turntable 32 by bolts. A track 34 is fixed to the bottom of the connecting plate 35 by bolts. A linear motor 33 is slidably connected to the outer side of the track 34. A gravity block 36 is fixed to one side of the linear motor 33 by bolts. A driving component for driving the turntable 32 to rotate is provided at the bottom of the adjustment platform 14.
[0027] With the above solution, the plurality of limit grooves 27 can make the bracket 28 be clamped according to the actual installation position. At the same time, when the bracket 28 is clamped with the limit groove 27, the magnetic block 29 bonded to the bottom of the slide groove 30 can be adsorbed with the bracket 28, thereby achieving the fixing effect of the bracket 28. When the linear motor 33 operates, it will drive the gravity block 36 to move along the direction of the track 34. At the same time, when the driving component that makes the driving turntable 32 rotate operates, it will also drive the driving turntable 32 to rotate accordingly.
[0028] As Figure 7 shown, the driving component includes a second mounting frame 40. An annular tooth groove 41 penetrating through the turntable 32 is formed at the bottom of the turntable 32. The second mounting frame 40 passes through the annular tooth groove 41 and is fixed to the bottom of the adjustment table 14 by bolts. A second reduction motor 39 is fixed to the bottom of the second mounting frame 40 by bolts. One end of the output shaft of the second reduction motor 39 passes through the second mounting frame 40 and is connected with a second driving gear 38. The second driving gear 38 extends into the annular tooth groove 41 and meshes with the annular tooth groove 41.
[0029] Adopting the above scheme: Figure 7 It can be seen that the outer shape of the second mounting frame 40 presents a "Z" shape. The connection between one end of the second mounting frame 40 and the adjustment table 14 stably installs and places the second mounting frame 40, and at the same time improves the stability of the second reduction motor 39 installed on the second mounting frame 40. When the output end of the second reduction motor 39 drives the second driving gear 38 to move, the annular tooth groove 41 meshing with the second driving gear 38 will synchronously drive the rotation of the driving turntable 32.
[0030] As Figure 4 shown, two guide rails 26 are fixed to the upper surface of the adjustment table 14 by bolts. Two guide grooves 25 are formed at the bottom of the suspension table 8. The two guide rails 26 respectively slide with the two guide grooves 25 to guide the rotation of the adjustment table 14; A plurality of support arms 6 for keeping the center of gravity of the crane 1 are arranged outside the crane 1.
[0031] Adopting the above scheme: Figure 4 It can be seen that the shape of the guide rail 26 presents a semi-circular arc. The rotation of the suspension table 8 and the adjustment table 14 performs a circular motion with the center position of the suspension table 8 as the axis. Through the setting of the support arms 6, during the use of the crane 1, the support arms 6 are extended to contact the ground, so that the support arms 6 support the crane 1, thereby preventing the crane 1 from tilting due to unstable center of gravity when hoisting the steel structure corridor and improving the stability of the use of the crane 1.
[0032] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.
[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A guide wheel lifting ceiling device for an assembled steel structure corridor, comprising a crane (1), characterized in that: A telescopic arm (2) is provided on one side of the crane (1), a retractable lifting rope (3) is provided on one end of the telescopic arm (2), a lifting wheel (4) is installed at the bottom of the lifting rope (3), a plurality of steel wire ropes (7) are connected to the bottom of the lifting wheel (4) via a steel wire rope joint, the bottom ends of the plurality of steel wire ropes (7) are connected to a lifting platform (8) via a steel wire rope joint, the plurality of steel wire ropes (7) are respectively located at the four corners of the lifting platform (8), a mounting hole is opened on the upper surface of the lifting platform (8), a connecting shaft (16) is rotatably connected to the mounting hole via a bearing (20); An adjusting platform (14) is welded to the bottom end of the connecting shaft (16), a power assembly for driving the adjusting platform (14) to rotate is provided on the upper surface of the hanging platform (8), four corners of the bottom of the adjusting platform (14) are connected to steel wire ropes (13) via steel wire rope joints, the bottom ends of the plurality of steel wire ropes (13) are connected to a hanger (5) via steel wire rope joints, two guide rods (12) are welded to the bottom of the hanger (5), two slides (11) are slidably connected to the outer sides of the two guide rods (12), hooks (10) are provided at the bottom of the two slides (11), a locking mechanism (9) for fixing the slides (11) is provided at the top of the hanging platform (5), and a weight adjustment mechanism (15) for changing the center of gravity of the steel structure corridor is provided at the bottom of the adjusting platform (14).
2. The guide wheel lifting ceiling device of the assembled steel structure corridor according to claim 1 is characterized in that: The power assembly comprises a mounting frame (22), wherein the mounting frame (22) is fixed to the upper surface of the hanging platform (8) by bolts, and a reduction motor (23) is fixed inside the mounting frame (22) by bolts; One end of the output shaft of the reduction motor 1 (23) passes through the mounting frame 1 (22) and is connected to a driving gear 1 (24) via a coupling. The top end of the connecting shaft (16) is connected to a toothed disc (17), and the toothed disc (17) is meshed with the driving gear 1 (24). The diameter of the driving gear 1 (24) is smaller than the diameter of the toothed disc (17).
3. The guide wheel lifting ceiling device of the assembled steel structure corridor according to claim 1 is characterized in that: A connecting disk (18) is welded to the circumferential outer wall of the connecting shaft (16) below the toothed disk (17); a plurality of steel balls (19) are rollingly connected to the bottom of the connecting disk (18); an annular groove (21) is provided on the upper surface of the hanging platform (8); the plurality of steel balls (19) roll along the annular groove (21) to support the connecting shaft (16).
4. The guide wheel lifting ceiling device of the assembled steel structure corridor according to claim 1 is characterized in that: The locking mechanism (9) comprises a plurality of limit grooves (27), the plurality of limit grooves (27) being evenly and symmetrically arranged on the upper surface of the hanger (5), the two sides of the slide table (11) being provided with slide grooves (30) with open tops, a clamping frame (28) being slidably connected in two adjacent slide grooves (30), and the clamping frame (28) being located on the upper surface of the hanger (5) and clamped with the limit grooves (27); A magnetic block (29) is bonded to the bottom of the slide groove (30), and the magnetic block (29) and the card frame (28) are attracted to each other so that the card frame (28) is fixed.
5. The guide wheel lifting ceiling device of the assembled steel structure corridor according to claim 1 is characterized in that: The weight adjustment mechanism (15) comprises a limit rail (31), the limit rail (31) is fixed to the bottom of the adjustment platform (14) by means of bolts, a turntable (32) is rotatably connected inside the limit rail (31), and a connecting plate (35) is fixed to the bottom of the turntable (32) by means of bolts; A track (34) is fixed to the bottom of the connecting plate (35) by means of bolts, a linear motor (33) is slidably connected to the outer side of the track (34), a gravity block (36) is fixed to one side of the linear motor (33) by means of bolts, and a driving assembly for driving the turntable (32) to rotate is provided at the bottom of the adjusting platform (14).
6. The guide wheel lifting ceiling device of the assembled steel structure corridor according to claim 5 is characterized in that: The driving assembly comprises a second mounting frame (40), the bottom of the turntable (32) is provided with an annular tooth groove (41) penetrating the turntable (32), and the second mounting frame (40) passes through the annular tooth groove (41) and is fixed to the bottom of the adjustment platform (14) by bolts.
7. The guide wheel lifting ceiling device of the assembled steel structure corridor according to claim 6 is characterized in that: A reduction motor 2 (39) is fixed to the bottom of the second mounting frame (40) by bolts. One end of the output shaft of the second reduction motor (39) passes through the second mounting frame (40) and is connected to a driving gear 2 (38). The driving gear 2 (38) extends into the annular tooth groove (41) and meshes with the annular tooth groove (41).
8. The guide wheel lifting ceiling device of the assembled steel structure corridor according to claim 1 is characterized in that: The upper surface of the adjustment platform (14) is fixed with two guide rails (26) by bolts, and the bottom of the hanging platform (8) is provided with two guide grooves (25), and the two guide rails (26) slide with the two guide grooves (25) respectively, so that the rotation of the adjustment platform (14) is guided; A plurality of support arms (6) for maintaining the center of gravity of the crane (1) are provided on the outer side of the crane (1).