A linkage-type non-powered automatic bag grabbing and unloading crane

Abstract

A linkage-type automatic bag-grabbing and unloading crane includes a self-positioning rotary tower, a lifting platform, a linkage assembly, and multiple unpowered hooks, each with a self-locking hook on its outer wall. The linkage assembly includes a bearing seat, a linkage shaft, and a rotating block. Linkage blocks are located at both ends of the linkage shaft. The right end of each linkage block is rotatably connected to the top of the first self-locking hook on the left side via a first left connecting rod. The tops of two adjacent self-locking hooks on the left side are rotatably connected via a second left connecting rod. The left end of each linkage block is rotatably connected to the top of the first self-locking hook on the right side via a first right connecting rod. The tops of two adjacent self-locking hooks on the right side are rotatably connected via a second right connecting rod. A slide rail is provided in the rotating block, and a counterweight is located within the slide rail. In this invention, the linkage assembly can simultaneously drive multiple unpowered hooks for automatic grabbing and unloading, thereby improving work efficiency. Furthermore, the fixed position of each unpowered hook prevents wobbling, resulting in more precise bag-grabbing positioning.

Description

Technical Field

[0001] This invention relates to the field of hoisting equipment technology, specifically to a linkage-type non-powered automatic bag grabbing and unloading hoist. Background Technology

[0002] Currently, the unhooking methods used in hoisting operations are mainly divided into pneumatic unhooking and manual unhooking, which relies entirely on manual handling. When using the manual method, workers need to climb above the object to assist in hooking it, and after the object is in place, workers still need to climb back up to manually unhook it. Because the objects being hoisted are often high, the frequent climbing up and down increases the risk of falls and injuries from the lifting equipment, resulting in slow hoisting speeds, higher risks, and higher costs. While using the pneumatic unhooking method, workers still need to climb to complete the auxiliary hooking operation during the process, which also poses a risk of injury. Automatic unhooking operations also consume a large amount of nitrogen, requiring frequent replenishment and replacement, which increases the intensity of dock operations and hoisting costs.

[0003] The above two methods require manual operation or assistance, posing a safety hazard of injury to workers. Therefore, a non-powered automatic hook grabbing and unhooking lifting device and frame (CN2024101300736) has emerged in the prior art. Although this frame achieves automatic hook grabbing and unhooking without manual or other external force throughout the operation, each lifting device is independent, and the top of the lifting device is installed at the bottom of the lifting platform via a lifting chain, which is prone to swaying, resulting in inaccurate positioning when grabbing packages. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide a linkage-type non-powered automatic bag grabbing and unloading crane, which drives each non-powered hook to automatically grab and unload simultaneously through linkage components, and the position of each non-powered hook is fixed and will not shake, making the grabbing position more accurate.

[0005] A linkage-type non-powered automatic bag grabbing and unloading crane includes a self-positioning slewing tower plate installed on a crane, a lifting platform located below the self-positioning slewing tower plate and connected to the self-positioning slewing tower plate via an external lifting chain, a linkage component installed in the middle of the lifting platform, and a plurality of non-powered hooks symmetrically installed on both sides of the bottom of the lifting platform, each of the non-powered hooks having a self-locking hook on its outer wall;

[0006] The linkage assembly includes a bearing housing installed at the bottom of the hoisting platform, a linkage shaft disposed in the bearing housing, and a rotating block fixedly installed on the linkage shaft;

[0007] The two ends of the linkage shaft are respectively provided with linkage blocks. The right end of the linkage block is rotatably connected to the top of the first self-locking hook on the left side through the first left connecting rod. The tops of two adjacent self-locking hooks on the left side are rotatably connected through the second left connecting rod. The left end of the linkage block is rotatably connected to the top of the first self-locking hook on the right side through the first right connecting rod. The tops of two adjacent self-locking hooks on the right side are rotatably connected through the second right connecting rod.

[0008] The rotating block is equipped with a slide rail, and a counterweight is installed in the slide rail. Both ends of the counterweight are connected to the bottom of the self-positioning rotary tower plate through an internal suspension chain. One end of the slide rail is a locking position and the other end is an unlocking position. When the counterweight slides from the locking position to the unlocking position and the unlocking position rotates to the top of the linkage shaft, the linkage block rotates and simultaneously drives all the self-locking hooks to unlock.

[0009] Preferably, the linkage shaft is located on the vertical line of the slide rail.

[0010] Preferably, the counterweight includes a sliding shaft and shaft ends disposed at both ends of the sliding shaft;

[0011] The shaft end is connected to the inner suspension chain, and the sliding shaft is located in the slide rail.

[0012] Preferably, the two ends of the slide are respectively provided with short grooves communicating with the slide, and the linkage shaft is located on the angle bisector of the angle formed by the long bisectors of the two short grooves.

[0013] Preferably, the linkage block is a strip structure or a Z-shaped structure.

[0014] Preferably, the non-powered hook includes a lifting stroke plate installed at the bottom of the lifting platform, a first rotating shaft located at the bottom of the lifting stroke plate, an inner connecting rod and an outer connecting rod rotatably connected to the first rotating shaft, an inner claw rotatably connected to the other end of the inner connecting rod, an outer claw rotatably connected to the other end of the outer connecting rod, and a second rotating shaft rotatably connected to the middle of the outer claw and the inner claw.

[0015] A positioning counterweight is installed on the second rotating shaft. The positioning counterweight has a clearance groove, and the outer claw and the inner claw are located in the clearance groove.

[0016] The self-locking hook is rotatably mounted on the first rotating shaft at its center, the hook at its bottom hooks onto the second rotating shaft, and the top is rotatably connected to the first left connecting rod, the second left connecting rod, the first right connecting rod, or the second right connecting rod.

[0017] Preferably, the clearance groove is provided with a stop shaft that separates the inner claw and the outer claw, and the stop shaft is provided with an arc-shaped leaf spring, the opening of which is bent downward.

[0018] Preferably, a spring is provided on the rear end of the first rotating shaft, one of the spring's torsional feet is engaged with the bottom of the inner connecting rod, and the other torsional foot is engaged with the bottom of the outer connecting rod.

[0019] Preferably, the top of the lifting travel plate is provided with a groove, and the groove is connected to the lifting platform by bolts;

[0020] The lengths of the first left link, the second left link, the first right link, and the second right link can be adjusted.

[0021] Preferably, the lifting platform is rotatably mounted with outriggers at its ends and sides, and the distance between the outriggers and the lifting platform can be adjusted.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] First, the linkage component can simultaneously drive multiple non-powered hooks to automatically grab and unload hooks, thereby improving work efficiency. Moreover, the position of each non-powered hook is fixed and will not shake, making the grab position more accurate.

[0024] Secondly, the self-positioning rotary tower has a self-positioning function, which can lock the position and angle of the lifting frame when grabbing and unloading bags, so as to ensure that the lifting frame will not swing or rotate at will, thereby improving work efficiency.

[0025] Third, the entire process is automated, requiring no manual intervention or other external force to automatically grab and unload the hook, thereby improving efficiency and saving costs. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the linkage-type non-powered automatic bag grabbing and unloading crane in this invention;

[0027] Figure 2 for Figure 1 A schematic diagram of the structure of the central linkage component;

[0028] Figure 3 for Figure 1 A schematic diagram of a structure in which multiple non-powered hooks are connected together;

[0029] Figure 4 for Figure 1 Schematic diagram of the structure of a non-powered lifting hook;

[0030] Figure 5 for Figure 4 A schematic diagram of the structure of a non-powered lifting hook after the counterweight is removed;

[0031] Figure 6 This is a schematic diagram of the two unpowered hooks located in the middle position in the initial state of the present invention;

[0032] Figure 7 This is a schematic diagram of the movement flow of the two unpowered hooks located in the middle position in the present invention during the hook grabbing and unhooking process (from left to right, from top to bottom);

[0033] Figure 8 This is a front view of a linkage-type non-powered automatic bag-grabbing and unloading crane according to another embodiment of the present invention;

[0034] Figure 9 For Figure 8 Side view of a central linkage type non-powered automatic bag grabbing and unloading crane;

[0035] Figure 10 for Figure 8 A schematic diagram of the structure of a non-powered hook.

[0036] Explanation of key component symbols:

[0037] 100 - Self-positioning slewing tower; 200 - External lifting chain; 300 - Lifting platform; 30 - Outriggers;

[0038] 400-Linkage assembly; 40-Bearing housing; 41-Linkage shaft; 42-Rotating block; 421-Slide rail; 422-Short groove; 43-Linkage block; 44-First left connecting rod; 45-Second left connecting rod; 46-First right connecting rod; 47-Second right connecting rod; 48-Flag; 481-Sliding shaft; 482-Shaft end; 49-Inner suspension chain;

[0039] 500 - Non-powered hook; 50 - Lifting travel plate; 501 - Groove; 51 - First pivot; 52 - Inner connecting rod; 53 - Outer connecting rod; 54 - Inner claw; 55 - Outer claw; 56 - Second pivot; 57 - Positioning counterweight; 571 - Clearance groove; 572 - Stop shaft; 58 - Arc-shaped leaf spring; 59 - Spring;

[0040] 600 - Self-locking hook; 700 - Hanging bag.

[0041] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0042] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0043] Please see Figures 1 to 7In one embodiment of the present invention, a linkage-type non-powered automatic bag grabbing and unloading crane is provided, including a self-positioning rotary tower 100 installed on a crane, a lifting platform 300 located below the self-positioning rotary tower 100 and connected to the self-positioning rotary tower 100 via an external lifting chain 200, a linkage component 400 installed in the middle of the lifting platform 300, and a plurality of non-powered hooks 500 symmetrically installed on both sides of the bottom of the lifting platform 300, wherein each non-powered hook 500 is provided with a self-locking hook 600 on its outer wall;

[0044] The linkage assembly 400 includes a bearing seat 40 installed at the bottom of the hoisting platform 300, a linkage shaft 41 disposed in the bearing seat 40, and a rotating block 42 fixedly installed on the linkage shaft 41.

[0045] The two ends of the linkage shaft 41 are respectively provided with linkage blocks 43. The right end of the linkage block 43 is rotatably connected to the top of the first self-locking hook 600 on the left side through the first left connecting rod 44. The tops of two adjacent self-locking hooks 600 on the left side are rotatably connected through the second left connecting rod 45. The left end of the linkage block 43 is rotatably connected to the top of the first self-locking hook 600 on the right side through the first right connecting rod 46. The tops of two adjacent self-locking hooks 600 on the right side are rotatably connected through the second right connecting rod 47.

[0046] The rotating block 42 is provided with a slide rail 421, and a counterweight 48 is provided in the slide rail 421. The two ends of the counterweight 48 are connected to the bottom of the self-positioning rotary tower 100 through an inner suspension chain 49. One end of the slide rail 421 is a locking position and the other end is an unlocking position. When the counterweight 48 slides from the locking position to the unlocking position and the unlocking position rotates to the top of the linkage shaft 41, the linkage block 43 rotates and simultaneously drives all the self-locking hooks 600 to unlock.

[0047] It should be noted that in this invention, the lifting bag 700 is first pressed down by the non-powered hook 500, causing the sling to bulge. The self-positioning rotary tower 100 and the lifting platform 300 descend, and the counterweight 48 slides down from the locked position to the unlocked position under its own weight. Then, the self-positioning rotary tower 100 and the lifting platform 300 rise, and the counterweight 48 rises and drives the rotating block 42 and the linkage block 43 to rotate. The linkage block 43 pulls the corresponding self-locking hook 600 to rotate through each link, thereby triggering the unlocking action.

[0048] As the self-positioning rotary tower 100 and the hoisting platform 300 continue to rise, the jaws at the bottom of the non-powered hook 500 come together and hook the sling. Under the weight of the hoisting bag 700, the jaws will come together and will not loosen.

[0049] After the load 700 is transported to the designated location, the self-positioning rotary tower 100 and the lifting platform 300 descend, the jaws at the bottom of the non-powered hook 500 unfold and release the sling, and at the same time, the counterweight 48 slides down from the unlocked position to the locked position under its own weight. Then, the self-positioning rotary tower 100 and the lifting platform 300 rise, the counterweight 48 rises and drives the rotating block 42 and the linkage block 43 to rotate. The linkage block 43 pulls the corresponding self-locking hook 600 to rotate through each link, thereby locking the action to facilitate secondary lifting operations.

[0050] In this invention, the entire process requires no manual intervention or other external force; instead, the hooks are automatically grabbed and unloaded through the mechanism's own actions, thereby improving lifting efficiency and saving costs.

[0051] In a preferred embodiment of the present invention, the self-positioning rotary tower 100 is equipped with a PLC controller with an embedded electronic compass or GPS sensor, which enables the self-positioning rotary tower 100 to have a self-positioning function, and can lock the position and angle of the lifting frame when grabbing and unloading packages, so as to ensure that the lifting frame will not swing or rotate at will, thereby improving work efficiency.

[0052] Please see Figures 1 to 3 In a preferred embodiment of the present invention, the linkage shaft 41 is located on the vertical line of the slide 421 so that the rotating block 42 can rotate.

[0053] Please see Figures 1 to 3 In a preferred embodiment of the present invention, the weight 48 includes a sliding shaft 481 and shaft ends 482 disposed at both ends of the sliding shaft 481.

[0054] The shaft end 482 is connected to the inner suspension chain 49, and the sliding shaft 481 is located in the slide rail 421 so that the weight 48 is subjected to uniform force.

[0055] Please see Figures 1 to 3 In a preferred embodiment of the present invention, short grooves 422 communicating with the slide rail 421 are respectively provided at both ends of the slide rail 421, and the linkage shaft 41 is located on the angle bisector of the angle formed by the long bisectors of the two short grooves 422. One short groove 422 corresponds to the unlock position, and the other short groove corresponds to the locking position. Its function is to prevent the counterweight 48 from malfunctioning when it is in the locking or unlock position.

[0056] Please see Figures 1 to 3 In a preferred embodiment of the present invention, the linkage block 43 is a strip-shaped structure or a Z-shaped structure, so as to be connected with the first left connecting rod 44 and the first right connecting rod 46, and generate thrust on the first left connecting rod 44 and the first right connecting rod 46 respectively when rotating.

[0057] Please see Figures 4 to 7 In a preferred embodiment of the present invention, the non-powered hook 500 includes a lifting stroke plate 50 installed at the bottom of the lifting platform 300, a first rotating shaft 51 disposed at the bottom of the lifting stroke plate 50, an inner connecting rod 52 and an outer connecting rod 53 rotatably connected to the first rotating shaft 51, an inner claw 54 rotatably connected to the other end of the inner connecting rod 52, an outer claw 55 rotatably connected to the other end of the outer connecting rod 53, and a second rotating shaft 56 rotatably connected to the middle of the outer claw 55 and the inner claw 54.

[0058] A positioning counterweight 57 is installed on the second rotating shaft 56. The positioning counterweight 57 has an clearance groove 571, and the outer claw 55 and the inner claw 54 are located in the clearance groove 571.

[0059] The self-locking hook 600 is rotatably mounted on the first rotating shaft 51 at its center, the hook at its bottom hooks onto the second rotating shaft 56, and the top is rotatably connected to the first left connecting rod 44, the second left connecting rod 45, the first right connecting rod 46, or the second right connecting rod 47.

[0060] It should be noted that in this invention, the lifting bag is first pressed down by the positioning counterweight block 57, causing the lifting strap to bulge. The self-positioning rotary tower 100 and the lifting platform 300 descend. The counterweight 48 slides down from the locked position to the unlocked position under its own weight. Then, the self-positioning rotary tower 100 and the lifting platform 300 rise. The counterweight 48 rises and drives the rotating block 42 and the linkage block 43 to rotate. The linkage block 43 pulls the corresponding self-locking hook 600 to rotate through each link, causing the self-locking hook 600 to disengage from the second rotating shaft 56, thereby triggering the unlocking action.

[0061] As the self-positioning rotary tower 100 and the hoisting platform 300 continue to rise, the four-bar linkage consisting of the inner link 52, the outer link 53, the outer claw 55 and the inner claw 54 will cause the outer claw 55 and the inner claw 54 to come together and hook onto the sling. Under the weight of the sling, the outer claw 55 and the inner claw 54 will come together and will not loosen.

[0062] After the load is transported to the designated location, the self-positioning rotary tower 100 and the lifting platform 300 descend. The four-bar linkage consisting of the inner connecting rod 52, the outer connecting rod 53, the outer claw 55, and the inner claw 54 causes the outer claw 55 and the inner claw 54 to unfold and release the sling. At the same time, the counterweight 48 slides down from the unlocked position to the locked position under its own weight. Then, the self-positioning rotary tower 100 and the lifting platform 300 rise. The rise of the counterweight 48 drives the rotating block 42 and the linkage block 43 to rotate. The linkage block 43 pulls the corresponding self-locking hook 600 to rotate through each link, so that the self-locking hook 600 hooks the second rotating shaft 56, thereby locking the operation to facilitate the secondary lifting operation.

[0063] Please see Figure 5 and Figure 6 In a preferred embodiment of the present invention, the clearance groove 571 is provided with a stop shaft 572 that separates the inner claw 54 and the outer claw 55. An arc-shaped leaf spring 58 is provided on the stop shaft 572, and the opening of the arc-shaped leaf spring 58 is bent downwards. During the lifting process, as the outer claw 55 and the inner claw 54 retract, the arc-shaped leaf spring 58 is in a compressed state. After unloading, under the action of the self-restoring force of the arc-shaped leaf spring 58, it will generate an outward thrust on the outer claw 55 and the inner claw 54, thereby helping the unpowered hook 500 to return to its original position.

[0064] Please see Figure 5 and Figure 6 In a preferred embodiment of the present invention, a spring 59 is provided on the rear end of the first rotating shaft 51, one of the spring 59 is engaged at the bottom of the inner connecting rod 52, and the other is engaged at the bottom of the outer connecting rod 53.

[0065] Specifically, the bottom edges of the inner connecting rod 52 and the outer connecting rod 53 are respectively provided with locking slots, and the two torsion feet of the spring 59 are located in one of the locking slots to prevent the torsion feet from slipping. During the lifting process, as the inner connecting rod 52 and the outer connecting rod 53 retract, the spring 59 is in a compressed state. After unloading, under the action of the spring 59's own restoring force, it will generate an outward thrust on the inner connecting rod 52 and the outer connecting rod 53, thereby helping the unpowered hook 500 to return to its original position.

[0066] Please see Figure 8 and Figure 9 In a preferred embodiment of the present invention, outriggers 30 are rotatably mounted on the ends and sides of the hoisting platform 300, and the distance between the outriggers 30 and the hoisting platform is adjustable. The outriggers 30 are manually raised and lowered, and all outriggers 30 can be adjusted in position at their connection points with the hoisting platform 300 to accommodate objects of different widths.

[0067] It should be noted that when no hoisting operation is being performed, the four outriggers 30 provide support to ensure that all non-powered hooks 500 do not come into contact with the ground;

[0068] During hoisting operations, depending on the location and size of the load, the operators only retract one side and end outrigger 30 and adjust the distance between the other side and end outrigger 30 and the hoisting platform 300.

[0069] When performing hoisting operations, the self-positioning slewing tower 100 can quickly and accurately position the crane by bringing the outriggers 30 on both sides close to the hoisted object and then perform the subsequent grabbing action when moving to the unloading location. When unloading, the unloading is performed by positioning the unloading angle of the self-positioning slewing tower 100.

[0070] Throughout the entire work cycle, as long as the size of the hoisted object remains unchanged, the position of the outrigger 30 will not be adjusted.

[0071] Please see Figures 8 to 10 In a preferred embodiment of the present invention, the top of the lifting stroke plate 50 is provided with a groove 501, and the groove 501 is connected to the lifting platform 300 by bolts, so that the position of the non-powered hook 500 on the lifting platform 300 can be adjusted.

[0072] The lengths of the first left link, the second left link, the first right link, and the second right link can be adjusted, so that the distance between two adjacent unpowered hooks 500 can be adjusted.

[0073] It should be noted that, since the size and specifications of lifting bags vary from country to country, the spacing of the non-powered hook 500 is set to be adjustable, as is the distance between the outrigger 30 and the lifting platform 300, in order to adapt to different usage needs.

[0074] In a preferred embodiment of the present invention, multiple cameras are installed on the side wall of the hoisting platform 300, each camera corresponding to the position of one of the non-powered hooks 500. The cameras allow operators to quickly observe the position of each non-powered hook 500, and a bag-grabbing action can be achieved as long as the sling for securing the bag is within ±100mm of the bottom hook groove of the non-powered hook 500.

[0075] It should be noted that the hoisting operation is carried out through the following steps:

[0076] Step S11: Move the crane between the lifting position and the storage position and park it;

[0077] Step S12: The crane rotates the gantry to above the lifting position, and a wireless remote controller sends a first control command to the PLC controller to control the rotation of the self-positioning rotary tower so that the lifting platform rotates to a suitable grab angle.

[0078] Step S13: Send a first storage instruction to the PLC controller using a wireless remote controller so that the PLC controller stores the packet capture angle;

[0079] Step S14: The crane is used to rotate the gantry to the top of the storage position, and a second control command is sent to the PLC controller by a wireless remote controller to control the self-positioning rotary tower 100 to rotate so that the lifting platform 300 rotates to a suitable unloading angle.

[0080] Step S15: A second storage instruction is sent to the PLC controller using a wireless remote control so that the PLC controller stores the unloading angle.

[0081] Step S16: Based on the location and size of the load on site, the operator retracts one side and end outrigger 30 and adjusts the distance between the other side and end outrigger 30 and the lifting platform 300.

[0082] In step S17, the operator presses the grabbing command via wireless remote control, and the crane rotates the lifting frame to above the lifting position. The self-positioning slewing tower 100 rotates, causing the lifting platform 300 to rotate to a suitable grabbing angle. At the same time, the outriggers 30 position the side of the lifting bag 700.

[0083] In step S18, the lifting bag is first pressed down by the positioning counterweight block 57, causing the lifting strap to bulge. The self-positioning rotary tower 100 and the lifting platform 300 descend. The counterweight 48 slides down from the locked position to the unlocked position under its own weight. Then, the self-positioning rotary tower 100 and the lifting platform 300 rise. The counterweight 48 rises and drives the rotating block 42 and the linkage block 43 to rotate. The linkage block 43 pulls the corresponding self-locking hook 600 to rotate through each link, causing the self-locking hook 600 to disengage from the second rotating shaft 56, thereby triggering the unlocking action.

[0084] In step S19, the self-positioning rotary tower 100 and the lifting platform 300 continue to rise. The four-bar linkage consisting of the inner connecting rod 52, the outer connecting rod 53, the outer claw 55 and the inner claw 54 will cause the outer claw 55 and the inner claw 54 to come together and hook onto the sling to grab the bag. Under the gravity of the bag, the outer claw 55 and the inner claw 54 will come together and will not let go. During the lifting process, the outriggers 30 are retracted by the PLC controller.

[0085] In step S20, the operator presses the unloading command via wireless remote control. After the crane rotates the lifting frame to the designated position, the self-positioning slewing tower 100 and the lifting platform 300 descend. The four-bar linkage consisting of the inner connecting rod 52, the outer connecting rod 53, the outer claw 55, and the inner claw 54 causes the outer claw 55 and the inner claw 54 to unfold and release the slings for unloading. At the same time, the counterweight 48 slides down from the unlocked position to the locked position under its own weight. Then, the self-positioning slewing tower 100 and the lifting platform 300 rise. The counterweight 48 rises and drives the rotating block 42 and the linkage block 43 to rotate. The linkage block 43 pulls the corresponding self-locking hook 600 to rotate through each link, so that the self-locking hook 600 hooks the second rotating shaft 56, thereby locking the operation to facilitate secondary lifting operations.

[0086] Specifically, during operation, after the operator stores and sets the grab and unload angles via wireless remote control, the angles for each subsequent lifting action and each stored action are locked. Even if there are deviations, the lifting platform 300 will automatically return to the grab and unload angles under the guidance of the electronic compass or GPS sensor. Furthermore, the above operating steps can be adjusted to modify the lifting speed according to the actual conditions of the object being lifted on site.

[0087] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0088] First, the linkage component 400 can simultaneously drive multiple non-powered hooks 500 to automatically grab and unload hooks, thereby improving work efficiency. Moreover, the position of each non-powered hook 500 is fixed and will not shake, making the grab position more accurate.

[0089] Secondly, the self-positioning rotary tower 100 has a self-positioning function, which can lock the position and angle of the lifting frame when grabbing and unloading bags, so as to ensure that the lifting frame will not swing or rotate at will, thereby improving work efficiency.

[0090] Third, the entire process is automated, requiring no manual intervention or other external force to automatically grab and unload the hook, thereby improving efficiency and saving costs.

[0091] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A linkage powered automatic bag grabbing and ungrabbing hanger, characterized in that, The crane comprises a self-positioning slewing tower installed on the crane, a hoisting platform located below the self-positioning slewing tower and connected with the self-positioning slewing tower through an outer lifting chain, a linkage assembly installed in the middle of the hoisting platform, and a plurality of unpowered lifting hooks symmetrically installed on both sides of the bottom of the hoisting platform, wherein an outer wall of each unpowered lifting hook is provided with a self-locking hook. The linkage assembly comprises a bearing seat installed at the bottom of the hoisting platform, a linkage shaft arranged in the bearing seat, and a rotating block fixedly installed on the linkage shaft. Two ends of the linkage shaft are respectively provided with linkage blocks, a right end of each linkage block is rotatably connected with the top of a first self-locking hook located on the left side through a first left connecting rod, adjacent two self-locking hooks located on the left side are rotatably connected through a second left connecting rod, a left end of each linkage block is rotatably connected with the top of a first self-locking hook located on the right side through a first right connecting rod, and adjacent two self-locking hooks located on the right side are rotatably connected through a second right connecting rod. A slide is arranged in the rotating block, a weight is arranged in the slide, two ends of the weight are connected with the bottom of the self-positioning slewing tower through an inner lifting chain, one end of the slide is a locking position, and the other end is an unlocking position, when the weight slides from the locking position to the unlocking position and the unlocking position rotates to the top of the linkage shaft, the linkage blocks rotate and simultaneously drive all the self-locking hooks to perform an unlocking action. The linkage shaft is located on the median line of the slide. The weight comprises a sliding shaft and shaft ends arranged at two ends of the sliding shaft. The shaft ends are connected with the inner lifting chain, and the sliding shaft is located in the slide. Two ends of the slide are respectively provided with short grooves in communication with the slide, and the linkage shaft is located on the angle bisector of the included angle formed by the long bisectors of the two short grooves.

2. The linked, unpowered, automatic bag grabbing and unloading cradle of claim 1, wherein, The linkage block is in a strip structure or a Z-shaped structure.

3. The linked, unpowered, automatic bag grabbing and unloading cradle of claim 1, wherein, The unpowered lifting hook comprises a lifting stroke plate installed at the bottom of the hoisting platform, a first rotating shaft arranged at the bottom of the lifting stroke plate, an inner connecting rod and an outer connecting rod rotatably connected with the first rotating shaft, an inner claw rotatably connected with the other end of the inner connecting rod, an outer claw rotatably connected with the other end of the outer connecting rod, and a second rotating shaft rotatably connected with the middle portions of the outer claw and the inner claw. A positioning counterweight is installed on the second rotating shaft, an avoidance through groove is arranged in the positioning counterweight, and the outer claw and the inner claw are located in the avoidance through groove. The middle portion of the self-locking hook is rotatably installed on the first rotating shaft, the bottom of the hook hooks the second rotating shaft, and the top is rotatably connected with the first left connecting rod, the second left connecting rod, the first right connecting rod, or the second right connecting rod.

4. The linked, unpowered, automatic bag grabbing and unloading cradle of claim 3, wherein, An axle is arranged in the avoidance through groove to separate the inner claw and the outer claw, an arc-shaped plate spring is arranged on the axle, and the opening of the arc-shaped plate spring is downwardly bent.

5. The linked, unpowered, automatic bag grabbing and unbagging cradle of claim 3, wherein, A spring is arranged on the rear end of the first rotating shaft, one twisted leg of the spring is clamped at the bottom of the inner connecting rod, and the other twisted leg is clamped at the bottom of the outer connecting rod.

6. The linked, unpowered, automatic bag grabbing and unbagging cradle of claim 3, wherein, A strip groove is arranged at the top of the lifting stroke plate, and the strip groove is connected with the hoisting platform through bolts. The lengths of the first left connecting rod, the second left connecting rod, the first right connecting rod, and the second right connecting rod can be adjusted.

7. The linked, unpowered, automatic bag grab and bag off hanger of any one of claims 1 to 6, wherein, The end and side of the hoisting platform are respectively provided with a supporting leg which is rotatably installed, and the distance between the supporting leg and the hoisting platform can be adjusted.

Images