An adjustable lifting mechanism with a rotating shaft

Abstract

This application relates to an adjustable lifting mechanism with a rotating shaft, specifically within the technical field of safety clamp lifting structures. The adjustable lifting mechanism includes two lifting structures, a linkage mechanism, and a drive mechanism. Each lifting structure includes: a linkage shaft rotatably mounted on an upper beam; cranks mounted on the linkage shaft, with the linkage mechanism connected to the two cranks; a movable fork with a movable hole; a pull bar connected to the safety clamp, passing through the movable hole and forming a movable gap between it and the hole; and a fixing component that allows the pull bar and safety clamp to move, allowing for clearance through the movable gap. This application features two symmetrically arranged lifting structures, with the linkage mechanism connecting the two cranks. When either crank is driven to rotate, the linkage mechanism transmits the motion to the other crank, making the operation of the two lifting structures more stable. Simultaneously, the movable fork, when rotating, allows for clearance through the gap between the movable hole and the pull bar, making installation convenient and the lifting effect stable.

Description

Technical Field

[0001] This application relates to the technical field of safety clamp lifting structures, and in particular to a lifting mechanism with an adjustable rotating shaft. Background Technology

[0002] The double-lift safety clamp structure is the core linkage component of the elevator speed governor-safety clamp protection system. Its main functions are: to synchronously trigger the safety clamps on both sides of the car, to ensure balanced braking force on the left and right sides, to suppress malfunctions caused by uneven load, and to improve the reliability and stability of the elevator car's emergency stop.

[0003] Existing traditional safety clamp double-lifting structures generally rely on rigid connections without rotational compensation. The safety clamp pull bar is susceptible to horizontal bending forces, and is prone to deformation and jamming after long-term use. At the same time, adjustment is inconvenient during installation. To solve the above problems, there is an urgent need for a double-lifting structure that is easy to install and has a stable lifting effect. Summary of the Invention

[0004] To facilitate installation and ensure stable lifting performance, this application provides an adjustable lifting mechanism with a rotating shaft.

[0005] This application provides an adjustable lifting mechanism with a rotating shaft, which adopts the following technical solution: An adjustable lifting mechanism with a rotating shaft includes two lifting structures, a linkage mechanism, and a drive mechanism. The lifting structures include: The linkage shaft is rotatably mounted on the upper beam. A crank is mounted on a linkage shaft. The linkage mechanism is detachably connected to the two cranks and its length is adjustable. It is used to achieve synchronous rotation of the two cranks. The movable shift fork is mounted on the linkage shaft and has a rotating column. The rotating column has a movable hole along the sliding direction of the safety clamp. The pull bar connects to the safety clamp, passes through the movable hole, and forms a movable gap with the movable hole; A fixed component is mounted on the pull bar and connected to the movable fork. The rotation of the movable fork drives the pull bar and safety clamp to move through the fixed component, and allows for clearance through the movable gap.

[0006] By adopting the above technical solution, the crank and movable shift fork are fixedly installed on the linkage shaft, the linkage shaft is rotated and installed on the upper beam, then the pull bar is passed through the movable hole, the fixing component connects the pull bar to the rotating column, and finally the linkage mechanism is rotatably connected to the two cranks. During the connection process, the linkage mechanism can adjust its length to adapt to the different center distances of the two cranks, thereby realizing the installation of the lifting structure.

[0007] The two lifting structures are symmetrically arranged, and a linkage mechanism connects the two cranks. When either crank is driven to rotate, the linkage mechanism transmits the motion to the other crank. Due to the symmetrical geometric constraints of the mechanism, the two lifting structures operate more stably, resulting in better lifting stability. At the same time, when the movable fork rotates, it makes room for the pull bar through the gap between the movable hole and the pull bar, thereby reducing the risk of the pull bar being subjected to horizontal bending forces, making installation convenient and the lifting effect stable.

[0008] Meanwhile, the length of the linkage mechanism is adjusted on-site according to the actual situation to compensate for manufacturing and installation errors, ensuring that the initial angles of the two cranks are completely consistent. The same linkage mechanism can be adapted to lifting structures with different center distances, reducing the types of parts and lowering the cost of parts inventory. If the synchronization accuracy decreases after long-term use, it can be recalibrated by adjusting the length of the linkage mechanism without replacing parts, thus improving maintenance convenience.

[0009] Optionally, the fixing component includes: Two pads are fitted onto the pull bar and located on the upper and lower sides of the rotating column, and have locking grooves that contact the rotating column. Multiple fixing nuts are threaded onto the pull bar and are positioned against the opposite side walls of two pads; the movable shift fork drives the rotating column to rotate simultaneously, and after the rotating column rotates, it contacts the locking groove and pushes the fixing nuts and pull bar to move.

[0010] By adopting the above technical solution, the movable fork drives the rotating column to rotate upward around the linkage shaft axis. After the rotating column comes into contact with the locking groove, it pushes the locking nut and the pull bar to move upward. Conversely, the movable fork rotates downward. After the rotating column comes into contact with the locking groove, it pushes the locking nut and the pull bar to move downward, thereby realizing the vertical movement of the pull bar. The pull bar also makes room through the gap between the pull bar and the movable hole. Moreover, the rotating column and the locking groove are in surface contact, resulting in low contact stress, uniform wear, and long service life, which further makes the lifting effect more stable.

[0011] Optionally, the two movable forks rotate simultaneously in opposite directions, such that the linkage mechanism is located between the two movable forks.

[0012] By adopting the above technical solution, the two movable forks rotate simultaneously in opposite directions, which partially cancels out the force exerted by the pull bar on the movable forks. Furthermore, the linkage mechanism is located between the two movable forks, ensuring that the linkage mechanism does not affect the operation of the two movable forks. This makes the force on the mechanism more symmetrical and balanced, reduces the additional bending moment of the lifting shaft, and improves the overall rigidity and stability of the mechanism. This enhances the stability of the lifting mechanism and makes the lifting effect more stable.

[0013] Optionally, the linkage mechanism includes: Both linkage rod one and linkage rod two are detachably and rotatably connected to the two cranks respectively via connecting components; The adjusting assembly is connected to the ends of linkage rod one and linkage rod two away from the crank, and is used to adjust the distance between linkage rod one and linkage rod two, so that the two cranks rotate in opposite directions at the same time.

[0014] By adopting the above technical solution, both linkage rod one and linkage rod two are rotatably connected to the two cranks through a connecting assembly. Then, linkage rod one and linkage rod two are connected through an adjustment assembly, and the adjustment assembly adjusts the distance between linkage rod one and linkage rod two to adapt to the distance between the two cranks. Then, the two cranks rotate simultaneously in opposite directions, which makes the installation convenient and the lifting effect stable.

[0015] Optionally, the connection component includes: The connecting ring is mounted on the first linkage rod. The connecting screw passes through the connecting ring and is threaded into the crank, and is rotatably connected to the connecting ring.

[0016] By adopting the above technical solution, the connecting screw passes through the connecting ring and is threaded to the crank, thereby causing the linkage rod to rotate with the crank, making the connection structure stable and convenient, thus making installation convenient and the lifting effect stable.

[0017] Optionally, the adjustment component includes: The regulating tube has two threaded sections with opposite threads inside. The first and second linkage rods are respectively threaded onto the two threaded sections. Rotating the regulating tube drives the first and second linkage rods to move closer or further apart from each other. Two adjusting nuts are threaded onto linkage rod one and linkage rod two and press against both ends of the adjusting tube for positioning; A linkage seat is installed on the upper beam and has a linkage hole with a diameter larger than that of the second linkage rod. The second linkage rod passes through the linkage hole, and the crank rotation drives the second linkage rod and the first linkage rod to rotate, causing the two cranks to rotate in opposite directions simultaneously.

[0018] By adopting the above technical solution, two adjusting nuts are threaded onto linkage rod one and linkage rod two respectively, and then linkage rod one and linkage rod two are threaded onto the adjusting tube. Linkage rod two is passed through the linkage hole, and then linkage rod one and linkage rod two are rotated and installed onto the two cranks through two connecting components. During the installation process, if the distance between linkage rod one and linkage rod two cannot adapt to the position of the two cranks, it can be adjusted further to adapt to the installation between two cranks with different center distances. After the installation is completed, the two adjusting nuts are tightened and pressed against linkage rod one and linkage rod two respectively for positioning.

[0019] The two cranks are symmetrically arranged. The rotation of one crank drives the other crank to rotate through linkage rod one and linkage rod two. At the same time, the linkage hole restricts the movement of linkage rod two when it swings radially, which also improves the synchronization of the two cranks during rotation and further enhances the lifting effect.

[0020] Optionally, the adjustment assembly further includes an adjustment element, the adjustment element comprising: Both the locking disc and the locking nut are threaded onto the linkage rod; the locking nut is positioned by pressing against the side wall of the locking disc away from the linkage seat. The elastic element is sleeved on the first linkage rod, and its two ends press against the locking plate and the linkage seat for positioning.

[0021] By adopting the above technical solution, the locking nut and locking disc are sequentially threaded onto the first linkage rod. Then, the elastic element is fitted onto the first linkage rod. Tightening the locking disc causes the elastic element to press against the linkage seat and locking disc for positioning. The locking nut is then pressed against the locking disc for further positioning. The preload of the elastic element consistently tensions the first and second linkage rods in one direction, eliminating gaps in the hinge joint and preventing backlash during reversal. Simultaneously, it provides auxiliary power during mechanism reset, ensuring reliable release of the safety clamp and further improving lifting stability.

[0022] Optionally, the adjustment component includes: The rotating shaft is rotatably mounted on the upper beam, and its axis is parallel to the axis of the linkage rotating shaft. The midpoint of the line connecting the centers of the two linkage rotating shafts is located on the axis of the rotating shaft. A rotating seat is mounted on a rotating shaft; A movable seat is slidably mounted on a rotating seat along the axis of a linkage rod. The linkage rod slides through the movable seat and a locking element is provided on the movable seat to press against the linkage rod. The second movable seat is slidably mounted on the rotating seat along the axis of the second linkage rod. The second linkage rod is slidably passed through the second movable seat, and the second movable seat is provided with a second locking member that presses against the second linkage rod. The elastic element is sleeved on the first and second linkage rods, and its two ends press against the opposite side walls of the first and second movable seats for positioning.

[0023] By adopting the above technical solution, if the crank connected to the first linkage rod rotates, the crank rotation drives the first linkage rod to swing, and drives the first moving seat to slide on the rotating seat, thereby driving the rotating seat to rotate at a certain angle. The rotation of the rotating seat drives the second moving seat to move, and the movement of the second moving seat drives the second linkage rod to move and swing, thereby driving the other crank to rotate. Since the rotating shaft is located at the midpoint of the two linkage shafts, the two cranks rotate at the same angle. If the crank connected to the second linkage rod rotates, the rotation process is the same.

[0024] By setting the rotating shaft at the midpoint of the line connecting the centers of the two linkage shafts, the rotation of the rotating seat can make the two cranks rotate at the same angle. The movement of the first moving seat is used to adapt to the position change after the rotation of the first linkage rod, and the movement of the second moving seat is used to adapt to the position change after the rotation of the second linkage rod. This makes the operation of multiple structures more stable and easier to control, and further improves the stability during lifting.

[0025] Meanwhile, the positions can be adjusted by linkage rod one and moving seat one, and linkage rod two and moving seat two, thereby enabling two lifting structures with different center distances to be linked, reducing the types of parts and lowering the cost of parts inventory.

[0026] Optionally, the locking element one includes: The locking block is slidably mounted on the movable base and has an arc-shaped locking groove. The locking screw is threaded onto the movable seat and pushes the locking groove against the linkage rod for positioning.

[0027] By adopting the above technical solution, the locking screw pushes the locking block to press against the linkage rod for positioning. The arc-shaped locking groove fits tightly with the linkage rod, improving the locking effect.

[0028] Optionally, one end of the rotating column is provided with a stop plate, and the other end is provided with a pin hole, which is inserted and installed on the movable shift fork. An elastic pin is inserted and installed in the pin hole, so that the elastic pin and the stop plate abut against the opposite side walls of the movable shift fork for positioning.

[0029] By adopting the above technical solution, it is easy to make the pull bar pass through the movable hole, which facilitates maintenance and replacement.

[0030] In summary, this application includes at least one of the following beneficial technical effects: 1. By symmetrically arranging two lifting structures and connecting two cranks with a linkage mechanism, when either crank is driven to rotate, the linkage mechanism transmits the motion to the other crank. Due to the symmetrical geometric constraints of the mechanism, the two lifting structures operate more stably, resulting in better lifting stability. At the same time, when the movable fork rotates, it makes way for the pull bar through the gap between the movable hole and the pull bar, thereby reducing the risk of the pull bar being subjected to horizontal bending force, making installation convenient and the lifting effect stable.

[0031] 2. By adjusting the length of the linkage mechanism according to the actual situation at the installation site, manufacturing and installation errors are compensated to ensure that the initial angles of the two cranks are completely consistent. The same linkage mechanism can be adapted to lifting structures with different center distances, reducing the types of parts and lowering the cost of parts inventory. If the synchronization accuracy decreases after long-term use, it can be recalibrated by adjusting the length of the linkage mechanism without replacing parts, thus improving maintenance convenience.

[0032] 3. The rotating shaft is set at the midpoint of the line connecting the centers of the two linkage shafts. The rotation of the rotating seat can make the two cranks rotate at the same angle. The movement of the first moving seat is used to adapt to the position change after the first linkage rod rotates, and the movement of the second moving seat is used to adapt to the position change after the second linkage rod rotates. This makes the operation of multiple structures more stable and easier to control, and further improves the stability during lifting. Attached Figure Description

[0033] Figure 1 This is a three-dimensional structural schematic diagram of embodiment 1 of the adjustable lifting mechanism; Figure 2 This is a schematic diagram of the lifting structure and linkage mechanism in Embodiment 1 of the adjustable lifting mechanism; Figure 3 This is a schematic diagram of the lifting structure and linkage mechanism in Embodiment 1 of the adjustable lifting mechanism, in which the first pull bar and the fixing component are exploded; Figure 4 This is a partial structural diagram of the adjustable lifting mechanism in Embodiment 1, mainly showing the linkage mechanism; Figure 5 This is a partial structural diagram of the adjustable lifting mechanism in Embodiment 1, mainly showing the linkage mechanism, in which the elastic element is exploded; Figure 6 This is a partial structural schematic diagram of Embodiment 2 of the adjustable lifting mechanism, mainly showing the adjustment components; Figure 7 This is a partial structural schematic diagram of embodiment 2 of the adjustable lifting mechanism, mainly showing the adjustment components, in which the elastic element is exploded.

[0034] Reference numerals: 1. Upper beam; 11. Locking component one; 12. Locking component two; 13. Locking block; 14. Locking screw; 15. Fixing plate; 16. Locking groove; 2. Lifting structure; 21. Linkage shaft; 22. Crank; 23. Movable shift fork; 24. Pull bar; 25. Shift fork body; 26. Rotating column; 27. Abutment plate; 28. Elastic pin; 3. Fixing assembly; 31. Pad; 32. Fixing nut; 33. Mounting groove; 34. Movable hole; 35. Locking groove; 5. Drive mechanism; 5 1. Drive rod; 52. Sensor; 6. Linkage mechanism; 61. Linkage rod one; 62. Linkage rod two; 7. Adjustment assembly; 71. Adjustment tube; 72. Adjustment nut; 73. Linkage seat; 74. Adjustment component; 75. Locking disc; 76. Locking nut; 77. Elastic component; 78. Linkage hole; 8. Connecting assembly; 81. Connecting ring; 82. Connecting screw; 91. Rotating shaft; 92. Rotating seat; 93. Moving seat one; 94. Moving seat two; 95. Elastic component; 96. Moving groove. Detailed Implementation

[0035] The following provides a further detailed description of this application.

[0036] This application discloses an adjustable lifting mechanism with a rotating shaft.

[0037] Example 1, referring to Figure 1 and Figure 2 The adjustable lifting mechanism with a rotating shaft includes two lifting structures 2, a linkage mechanism 6, and a drive mechanism 5. The two lifting structures 2 work together to lift the safety clamp, and the linkage mechanism 6 is connected to the two lifting structures 2, so that the two lifting structures 2 operate synchronously; the drive mechanism 5 drives the two lifting structures 2 to move.

[0038] The upper beam 1 is an inherent structure of the elevator. The upper beam 1 is placed horizontally, and two upper beams 1 are arranged opposite each other along a direction perpendicular to their own length. Two lifting structures 2 are arranged at intervals along the length of the upper beam 1 and are set on the two upper beams 1. The lifting structure 2 includes a linkage shaft 21, a crank 22, a movable fork 23, a pull bar 24, and a fixing component 3. The linkage shaft 21 is rotatably installed on the two upper beams 1, and its axis is perpendicular to the length of the upper beam 1 and is in a horizontal state. The crank 22 is fixedly installed on one end of the linkage shaft 21 that extends to the outside of the two upper beams 1, and one end is arranged radially along the linkage shaft 21.

[0039] Reference Figures 1-3 The movable fork 23 is fixedly installed on the linkage shaft 21 and located between the two upper beams 1. The two linkage shafts 21 are located between the two movable forks 23, that is, the two movable forks 23 are mirror-symmetrically arranged about the perpendicular bisector of the line connecting the centers of the two linkage shafts 21. Two fork bodies 25 are integrally provided on the end of the movable fork 23 away from the linkage shaft 21. The two fork bodies 25 are spaced apart along the axis of the linkage shaft 21. A rotating column 26 can be detachably installed on each of the two fork bodies 25. An insertion hole is provided along the axis of the linkage shaft 21. The rotating column 26 is inserted into the insertion hole and rotatably connected to the insertion hole. An abutment plate 27 is integrally provided on the rotating column 26, which abuts against the shift fork body 25 for positioning. A vertical insertion hole is provided on the end of the rotating column 26 away from the abutment plate 27. An elastic pin 28 is vertically inserted into the insertion hole. The elastic pin 28 abuts against the side wall of the shift fork body 25 away from the abutment plate 27, so as to facilitate the replacement of the rotating column 26 on the shift fork body 25.

[0040] The shift fork body 25 has a vertically penetrating mounting groove 33, and the rotating column 26 located in the mounting groove 33 has a vertically positioned movable hole 34. Two pull bars 24 are provided and are corresponding to the two shift fork bodies 25. Both pull bars 24 are connected to the safety clamp. The diameter of the pull bar 24 is smaller than the inner diameter of the movable hole 34. The pull bar 24 passes vertically through the movable hole 34, so that the pull bar 24 and the movable hole 34 cooperate to form a clearance space.

[0041] The fixing component 3 includes two pads 31 and multiple fixing nuts 32. The two pads 31 are slidably sleeved on the pull bar 24 and located on the upper and lower sides of the rotating column 26. Each of the two pads 31 has an arc-shaped locking groove 35 that fits the rotating column 26 at the end near the rotating column 26. The multiple fixing nuts 32 are threaded to the pull bar 24 and are distributed on the upper and lower sides of the two locking blocks. Some of the fixing nuts 32 abut against the upper surface of the pad 31, and other fixing nuts 32 abut against the lower surface of the other pad 31, which facilitates the connection and replacement of the pull bar 24 and the rotating column 26.

[0042] The drive mechanism 5 includes a drive rod 51 and a sensor 52. The drive rod 51 is coaxially connected to a linkage shaft 21 and is driven by a drive source to drive the linkage shaft 21 to rotate. The crank 22... A sensing slot is provided; the sensor 52 is fixedly installed on the side wall of the upper beam 1, and the sensor 52 is correspondingly set with the crank 22. The sensor 52 is electrically connected to the controller, which is used to control the start and stop of the drive source; the drive source starts to drive the drive rod 51 and the linkage shaft 21 to rotate, the linkage shaft 21 rotates to drive the crank 22 to rotate, the sensor 52 senses the position, and when the position is reached, the sensor 52 triggers a signal to the controller, and the controller controls the drive source to stop.

[0043] Reference Figures 1-5 The linkage mechanism 6 is located between the two movable shift forks 23. The linkage mechanism 6 includes a first linkage rod 61 and a second linkage rod 62, and an adjustment component 7. Both the first linkage rod 61 and the second linkage rod 62 are detachably and rotatably connected to the two cranks 22 respectively through the connecting component 8. The following explanation uses the first linkage rod 61 as an example. The connecting component 8 includes a connecting ring 81 and a connecting screw 82. The connecting ring 81 is integrally set on the first linkage rod 61, and the center of the connecting ring 81 is located on the axis of the first linkage rod 61. The connecting screw 82 passes through the connecting ring 81 and is threadedly connected to the end of the crank 22 away from the linkage shaft 21. The axis of the connecting screw 82 is parallel to the bearing of the crank 22, so that the first linkage rod 61 is installed on the crank 22 and rotatably connected to the crank 22. At the same time, turning the connecting screw 82 to disengage from the crank 22 allows the first linkage rod 61 to be replaced.

[0044] The ends of linkage rod 1 61 and linkage rod 2 62 away from the connecting component 8 are arranged close to each other, and their axes coincide. The adjusting component 7 is connected to the ends of linkage rod 1 61 and linkage rod 2 62 away from the crank 22, and is used to adjust the distance between linkage rod 1 61 and linkage rod 2 62, so that the two cranks 22 rotate in opposite directions at the same time.

[0045] The adjusting assembly 7 includes an adjusting tube 71, two adjusting nuts 72, and a linkage seat 73. The adjusting tube 71, the first linkage rod 61, and the second linkage rod 62 are aligned on the same axis. The adjusting tube 71 has two threaded sections with opposite spiral lines. The opposite ends of the first linkage rod 61 and the second linkage rod 62 are threaded onto the two threaded sections. Rotation of the adjusting tube 71 drives the first linkage rod 61 and the second linkage rod 62 to move closer together, while reversal drives them to move away from each other. The linkage seat 73 is fixedly installed on the side wall of the upper beam 1, and a linkage hole 78 is provided on the linkage seat 73. The diameter of the linkage hole 78 is larger than the diameter of the second linkage rod 62. The second linkage rod 62 passes through the linkage hole 78, and a movable gap is formed between it and the linkage hole 78, so that the two cranks 22 rotate simultaneously at the same angle.

[0046] The adjusting component 74 includes a locking disc 75, a locking nut 76, and an elastic element 77. The locking disc 75 and the locking nut 76 are both threadedly connected to the first linkage rod 61. The locking nut 76 abuts against the side wall of the locking disc 75 away from the linkage seat 73. The elastic element 77 is sleeved on the first linkage rod 61, the adjusting component 7, and the second linkage rod 62, and the elastic element 77 presses against the locking disc 75 and the linkage seat 73 for positioning.

[0047] Two adjusting nuts 72 are threaded onto linkage rod 1 61 and linkage rod 2 62. The two ends of linkage rod 1 61 and linkage rod 2 62, where the adjusting nuts 72 are installed, are respectively threaded onto the inner walls of the two ends of the adjusting tube 71. If linkage rod 1 61 and linkage rod 2 62 are restricted from rotating, turning the adjusting tube 71 will drive linkage rod 1 61 and linkage rod 2 62 to move closer or further apart. Locking disc 75 and locking nut 76 are threaded onto linkage rod 2 62 in sequence. Elastic element 77 is fitted onto linkage rod 2 62, adjusting assembly 7, and linkage rod 1 61, with elastic element 77 abutting against the locking disc. Positioning is performed on 75. The second linkage rod 62 is passed through the linkage hole 78, and then the two ends of the first linkage rod 61 and the second linkage rod 62 are rotated and installed on the two cranks 22 through the two connecting components 8. During the installation process, the adjusting tube 71 can be rotated to adjust the distance between the first linkage rod 61 and the second linkage rod 62 to adapt to different size requirements. The elastic element 95 is pressed against the linkage seat 73 and the locking plate 75 for positioning. A movable gap is formed between the second linkage rod 62 and the linkage hole 78, so that the linkage mechanism 6 connects the two cranks 22, so that the two cranks 22 rotate simultaneously and in opposite directions.

[0048] The working principle of this application embodiment is as follows: Crank 22 and movable fork 23 are fixedly installed on linkage shaft 21. Linkage shaft 21 is rotated and installed on upper beam 1. Then, pull bar 24 is passed through movable hole 34. Fixing component 3 connects pull bar 24 to rotating column 26. Finally, linkage mechanism 6 is rotatably connected to two cranks 22. During the connection process, linkage mechanism 6 can adjust its length to adapt to different center distances of the two cranks 22, thereby realizing the installation of lifting structure 2.

[0049] Two lifting structures 2 are symmetrically arranged, and a linkage mechanism 6 connects two cranks 22. When any one crank 22 is driven to rotate, the linkage mechanism 6 transmits the motion to the other crank 22. Due to the symmetrical geometric constraints of the two lifting structures 2, the two lifting structures 2 are more stable during operation, resulting in better lifting effect stability. At the same time, when the movable fork 23 rotates, it makes way through the gap between the movable hole 34 and the pull bar 24, thereby reducing the risk of the pull bar 24 being subjected to horizontal bending force, making installation convenient and the lifting effect stable.

[0050] Example 2, refer to Figure 4 , Figures 6-7 The difference between this embodiment and embodiment 1 is that the adjustment component 7 includes a rotating shaft 91, a rotating seat 92, a first movable seat 93, a second movable seat 94, and a spring element 95. The rotating shaft 91 is rotatably mounted on the side wall of the upper beam 1, and its axis is parallel to the axis of the linkage rotating shaft 21 and is located between the two linkage rotating shafts 21. The midpoint of the line connecting the centers of the two linkage rotating shafts 21 is located on the axis of the rotating shaft 91. The rotating seat 92 is fixedly mounted on the rotating shaft 91, and its length direction is set along the axis of the first linkage rod 61 and the second linkage rod 62.

[0051] Movable seat 1 93 and movable seat 2 94 are slidably mounted on the side wall of rotating seat 92 along the length direction of rotating seat 92. Movable seat 1 93 is correspondingly set with linkage rod 1 61, and movable seat 2 94 is correspondingly set with linkage rod 2 62. Linkage rod 1 61 slides through movable seat 1 93 along its own axis. Movable seat 1 93 is provided with locking member 11 that presses against linkage rod 1 61 for positioning. Linkage rod 2 62 slides through movable seat 2 94 along its own axis. Movable seat 2 94 is provided with locking member 2 12 that presses against linkage rod 2 62 for positioning. Elastic member 95 is a spring. Elastic member 95 is sleeved on linkage rod 1 61 and linkage rod 2 62, and its two ends press against the opposite side walls of movable seat 1 93 and movable seat 2 94 for positioning.

[0052] Locking component 11 and locking component 2 12 have the same structure. The following explanation uses locking component 11 as an example. Locking component 11 includes a locking block 13 and a locking screw 14. A moving seat 1 93 has a moving groove 96. The moving groove 96 passes through the end of the moving seat 1 93 away from the rotating seat 92. The moving groove 96 is arc-shaped and fits against the linkage rod 1 61. A fixing plate 15 is fixedly installed on the moving seat 1 93 to block the moving groove 96. The locking block 13 is slidably installed on the moving groove 96 and has an arc-shaped locking groove 16 that fits against the linkage rod 1 61. The locking screw 14 is threadedly connected to the fixing plate 15. The locking screw 14 pushes the locking block 13 to press against the linkage rod 1 61 for positioning.

[0053] The working principle of this application embodiment is as follows: The rotation of crank 22 drives linkage rod 61 to swing, and drives moving seat 93 to slide on rotating seat 92, thereby driving rotating seat 92 to rotate a certain angle. The rotation of rotating seat 92 drives moving seat 94 to move, and the movement of moving seat 94 drives linkage rod 62 to move and swing, thereby driving the other crank 22 to rotate. Since the rotating shaft 91 is located at the midpoint of the two linkage shafts 21, the two cranks 22 rotate at the same angle, making the lifting effect stable.

[0054] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A double lifting mechanism with an adjustable rotating shaft, characterized in that: It includes two lifting structures (2), a linkage mechanism (6), and a driving mechanism (5). The lifting structure (2) includes: The linkage shaft (21) is rotatably mounted on the upper beam (1); The crank (22) is mounted on the linkage shaft (21). The linkage mechanism (6) is detachably connected to the two cranks (22) and its length is adjustable. It is used to realize the synchronous rotation of the two cranks (22). The movable shift fork (23) is set on the linkage shaft (21) and is provided with a rotating column (26). The rotating column (26) is provided with a movable hole (34) along the sliding direction of the safety clamp. The pull bar (24) is connected to the safety clamp and passes through the movable hole (34), forming a movable gap between itself and the movable hole (34); A fixed component (3) is disposed on the pull bar (24) and connected to the movable fork (23). The movable fork (23) rotates to drive the pull bar (24) and the safety clamp to move through the fixed component (3) and to make way through the movable gap.

2. The adjustable double lifting mechanism with a rotating shaft according to claim 1, characterized in that: The fixing component (3) includes: Two pads (31) are fitted on the pull bar (24) and located on the upper and lower sides of the rotating column (26), and have locking grooves (35) that contact the rotating column (26). Multiple fixing nuts (32) are threaded onto the pull bar (24) and abut against the opposite side walls of the two pads (31) for positioning; the movable fork (23) rotates to drive the rotating column (26) to rotate simultaneously, and after the rotating column (26) rotates, it contacts the locking groove (35) and pushes the fixing nuts (32) and the pull bar (24) to move.

3. The adjustable double lifting mechanism with a rotating shaft according to claim 1, characterized in that: The two movable forks (23) rotate simultaneously in opposite directions, and the linkage mechanism (6) is located between the two movable forks (23).

4. The adjustable double lifting mechanism with a rotating shaft according to claim 3, characterized in that: The linkage mechanism (6) includes: Linkage rod one (61) and linkage rod two (62) are detachably and rotatably connected to the two cranks (22) respectively via connecting assembly (8); The adjusting component (7) is connected to the end of the linkage rod one (61) and linkage rod two (62) away from the crank (22), and is used to adjust the distance between the linkage rod one (61) and linkage rod two (62), so that the two cranks (22) rotate in opposite directions at the same time.

5. The adjustable double lifting mechanism with a rotating shaft according to claim 4, characterized in that: The connection component (8) includes: A connecting ring (81) is set on the first linkage rod (61); The connecting screw (82) passes through the connecting ring (81) and is threadedly connected to the crank (22), and is rotatably connected to the connecting ring (81).

6. The adjustable double lifting mechanism with a rotating shaft according to claim 4, characterized in that: The adjustment component (7) includes: The regulating tube (71) has two threaded sections with opposite threads inside. The first linkage rod (61) and the second linkage rod (62) are respectively threaded onto the two threaded sections. Rotating the regulating tube (71) drives the first linkage rod (61) and the second linkage rod (62) to move closer or further away from each other. Two adjusting nuts (72) are threaded onto linkage rod one (61) and linkage rod two (62) and press against both ends of adjusting tube (71) for positioning; Linkage seat (73) is set on the upper beam (1) and has a linkage hole (78) with a diameter larger than that of linkage rod two (62). Linkage rod two (62) passes through linkage hole (78) and causes crank (22) to rotate, driving linkage rod two (62) and linkage rod one (61) to rotate, and causing the two cranks (22) to rotate in opposite directions at the same time.

7. The adjustable double lifting mechanism with a rotating shaft according to claim 6, characterized in that: The adjustment assembly (7) further includes an adjustment member (74), the adjustment member (74) comprising: The locking disc (75) and the locking nut (76) are both threaded onto the linkage rod (61); the locking nut (76) is positioned by pressing against the side wall of the locking disc (75) away from the linkage seat (73); The elastic element (77) is sleeved on the first linkage rod (61), and its two ends press against the locking plate (75) and the linkage seat (73) for positioning.

8. The adjustable double lifting mechanism with a rotating shaft according to claim 4, characterized in that: The adjustment component (7) includes: The rotating shaft (91) is rotatably mounted on the upper beam (1), and its axis is parallel to the axis of the linkage rotating shaft (21). The midpoint of the line connecting the centers of the two linkage rotating shafts (21) is located on the axis of the rotating shaft (91). A rotating seat (92) is mounted on a rotating shaft (91); The movable seat (93) is slidably mounted on the rotating seat (92) along the axis of the linkage rod (61). The linkage rod (61) is slidably passed through the movable seat (93). The movable seat (93) is provided with a locking member (11) that presses against the linkage rod (61). The movable seat 2 (94) is slidably mounted on the rotating seat (92) along the axis of the linkage rod 2 (62). The linkage rod 2 (62) is slidably mounted on the movable seat 2 (94). The movable seat 2 (94) is provided with a locking piece 2 (12) that presses against the linkage rod 2 (62). The elastic element (95) is sleeved on the first linkage rod (61) and the second linkage rod (62), and its two ends press against the opposite side walls of the first movable seat (93) and the second movable seat (94) for positioning.

9. The adjustable double lifting mechanism with a rotating shaft according to claim 8, characterized in that: The locking element one (11) includes: The locking block (13) is slidably mounted on the movable seat (93) and has an arc-shaped locking groove (35). The locking screw (14) is threaded onto the moving seat (93) and pushes the locking groove (35) against the linkage rod (61) for positioning.

10. The adjustable double lifting mechanism with a rotating shaft according to claim 1, characterized in that: One end of the rotating column (26) is provided with a backing plate (27), and the other end is provided with a pin hole, which is inserted and installed on the movable fork (23). An elastic pin (28) is inserted and installed on the pin hole, so that the elastic pin (28) and the backing plate (27) abut against the opposite side walls of the movable fork (23) for positioning.

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