Linkage type double-head gantry crane

Abstract

The invention relates to the technical field of cranes, in particular to a linkage type double-head gantry crane which comprises a carrying platform, two hoisting mechanisms, two suspension arms and two rotating mechanisms. The two hoisting mechanisms are fixedly mounted at the top of the carrying platform; the two suspension arms are hinged to the two sides of the carrying platform through first hinge bases correspondingly. A pulley block for winding a corresponding steel wire rope is mounted at the end part, far away from the first hinge seat, of each suspension arm; the two rotating mechanisms are mounted at the top of the carrying platform, correspond to the lifting arms one to one and are used for enabling the corresponding lifting arms to rotate outwards or inwards around the first hinge seats; the lifting arm can rotate outwards or inwards around the first hinge seat, and when the lifting arm faces oversized and overweight goods, the distance between two sets of lifting points can be shortened, so that the oversized and overweight goods can be stably lifted; and meanwhile, the two groups of lifting units are used for jointly lifting oversized and overweight goods, so that the power output and the bearing capacity required by lifting are fully guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cranes, in particular to a linkage type double-head gantry crane. BACKGROUND

[0002] In industrial scenes such as port terminals, cargo yards, heavy machinery manufacturing workshops, etc., cranes are the core equipment for material transfer. Compared with traditional single-head gantry cranes, double-head gantry cranes can simultaneously carry out hoisting operations on two pieces of cargo due to the unique design of two independent lifting units, greatly improving the efficiency of material transfer.

[0003] The existing double-head gantry crane mainly includes: a gantry main body (carrying platform), which is the load-bearing core of the whole device, and is equipped with a set of wheels at the bottom, which can move horizontally; two independently arranged hoisting arms, which are mostly of cantilever or inclined strut structure, and are arranged on both sides of the gantry main body; two complete lifting mechanisms, one for each hoisting arm, each lifting mechanism can independently complete the lifting and lowering of the cargo, realizing the parallel hoisting of two pieces of cargo.

[0004] In order to realize independent hoisting of two pieces of cargo and avoid mutual interference during hoisting, the two hoisting arms of the existing double-head gantry crane need to maintain a large distance, so that the operating range of the two lifting units is relatively dispersed. However, when facing super large and super heavy single-piece cargo, the power output and carrying capacity of a single lifting unit are limited, which cannot meet the hoisting needs of super large and super heavy cargo; if two lifting units are used to jointly hoist super heavy cargo, the distance between the two lifting points is far beyond the reasonable distance between the lifting points of the cargo due to the excessively large distance between the two hoisting arms, resulting in uneven force on the cargo and potential safety hazards such as tilting, swinging and even slipping. Therefore, we propose a linkage type double-head gantry crane to solve the above problems. SUMMARY

[0005] The present application aims to provide a linkage type double-head gantry crane to solve the problem of the existing double-head gantry crane being unable to hoist super large and super heavy cargo as mentioned in the background.

[0006] The present application is achieved by the following technical solution: a linkage type double-head gantry crane, comprising a carrying platform, further comprising: Two hoisting mechanisms, both of which are fixedly installed on the top of the carrying platform, and both have a steel wire rope wound on the drum of each hoisting mechanism; Two hoisting arms, each hoisting arm is hinged to the two sides of the carrying platform through a first hinge seat, and each hoisting arm corresponds to a hoisting mechanism; a pulley block for winding the corresponding steel wire rope is installed at the end of each hoisting arm away from the first hinge seat; the hoisting mechanism cooperates with the corresponding hoisting arm and pulley block to form an independent lifting unit; Two rotating mechanisms are mounted on the top of the carrying platform, each rotating mechanism corresponds to each boom, and is used for rotating the corresponding boom outward or inward around the first hinge seat; When the two booms are rotated outward to the preset positions, the two groups of lifting units independently lift the goods; When the two booms are rotated inward to the preset positions, the two groups of lifting units synchronously lift the goods.

[0007] Optionally, the pulley blocks mounted at the ends of the booms are provided with two groups, the axes of the two groups of pulley blocks are on the same straight line, and the steel wires are independently wound on each group of pulley blocks.

[0008] Optionally, the two groups of pulley blocks are slidingly connected to the ends of the booms, and the two groups of pulley blocks can approach or move away from each other along the axes; When the two booms are rotated outward to the preset positions, the two groups of pulley blocks approach each other; When the two booms are rotated inward to the preset positions, the two groups of pulley blocks move away from each other.

[0009] Optionally, the top of the carrying platform is fixedly provided with a stand, the stand is located between the two hoist mechanisms, and the two rotating mechanisms are mounted on the two sides of the stand.

[0010] Optionally, the rotating mechanism comprises a first truss extending in the horizontal direction, one end of the first truss is hingedly connected to the side surface of the stand through a second hinge seat; A third hinge seat is hingedly connected to the end of the boom close to the pulley block, and the third hinge seat is slidingly connected to the bottom of the first truss; The third hinge seat can move along the length direction of the first truss, so that the boom rotates around the first hinge seat.

[0011] Optionally, the bottom of the first truss is fixedly provided with a first linear sliding table, the executing end of the first linear sliding table can move along the length direction of the first truss, and the third hinge seat is fixedly mounted on the executing end of the first linear sliding table.

[0012] Optionally, the first truss is provided with a sliding groove corresponding to each group of pulley blocks, each sliding groove comprises a first linear segment, an oblique segment and a second linear segment arranged in sequence along the length direction of the first truss; the distance between the two first linear segments is smaller than the distance between the two second linear segments; A sliding rod slidingly matched with the corresponding sliding groove is fixedly connected to each pulley block; When the third hinge seat slides along the length direction of the first truss, the sliding rod slides along the sliding groove, so that the two groups of pulley blocks approach or move away from each other.

[0013] Optionally, the rotating mechanism comprises a second truss extending in a horizontal direction, one end of the second truss is hingedly connected to the boom through a fourth hinged seat, and a fifth hinged seat is hingedly connected to the other end of the second truss, and the fifth hinged seat is slidingly connected to the side surface of the stand; The fifth hinged seat is capable of moving up and down along the side surface of the stand to rotate the boom around the first hinged seat.

[0014] Optionally, a second linear slide is fixedly installed on the side surface of the stand, and the executing end of the second linear slide is capable of moving up and down, and the fifth hinged seat is fixedly installed on the executing end of the second linear slide.

[0015] Optionally, a reset spring and a connecting rope are connected to the side away from each other of the two groups of pulley blocks; One end of each reset spring away from the pulley block is connected to the boom, and one end of each connecting rope away from the pulley block is connected to the stand after passing through a guide member on the second truss; When the boom rotates outward to a preset position, each connecting rope is in a relaxed state, and each reset spring is in a natural extension state, so that the two groups of pulley blocks are close to each other; When the boom rotates inward to a preset position, each connecting rope is in a taut state, and each reset spring is in a compressed state, so that the two groups of pulley blocks are away from each other.

[0016] Compared with the prior art, the present application provides a linkage type double-head door crane, which has the following beneficial effects: 1. The boom of the present application can rotate outward or inward around the first hinged seat, and when facing oversized and overweight cargo, the distance between the two groups of lifting points can be shortened, so that the oversized and overweight cargo can be stably lifted; at the same time, the two groups of lifting units jointly lift the oversized and overweight cargo, fully guaranteeing the power output and carrying capacity required for lifting.

[0017] 2. Two groups of pulley blocks are provided at the end of each boom, when lifting cargo independently, the two groups of pulley blocks are close to each other, so that the lifting points correspond to the middle region where the center of gravity of the cargo is located, ensuring that the cargo is balanced; when lifting oversized and overweight cargo, the two groups of pulley blocks are away from each other, so that the lifting points are located on the front and back sides of the end of the cargo to form a symmetrical support structure, greatly improving the stability and balance during the lifting of oversized and overweight cargo. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a state diagram of two groups of lifting units independently lifting in Example 1; Figure 2 It is a state diagram of two groups of lifting units jointly lifting in Example 1; Figure 3 It is a schematic diagram of a sliding rod in Example 1; Figure 4 Figure 1 is a schematic diagram of the chute of the first embodiment; Figure 5 Figure 2 is a state diagram of the two groups of lifting units independently hoisting of the second embodiment; Figure 6 Figure 3 is a state diagram of the two groups of lifting units jointly hoisting of the second embodiment; Figure 7 Figure 4 is a schematic diagram of the reset spring of the second embodiment.

[0019] In the figure: 1, the carrying platform; 2, the winch mechanism; 3, the lifting arm; 4, the pulley block; 5, the rotating mechanism; 501, the first truss; 502, the first linear slide; 503, the second truss; 504, the second linear slide; 6, the stand; 7, the chute; 8, the slide rod; 9, the reset spring; 10, the connecting rope. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0021] Embodiment 1: please refer to Figures 1 to 4 A linkage type double-head gantry crane, comprising a carrying platform 1, which is in the form of a door-shaped frame structure as a whole, is made of high-strength alloy steel and is welded into shape, and provides a stable mounting base and support carrier for other components for subsequent assembly. The carrying platform 1 is equipped with a wheel set at each of the four corner positions on the bottom, so that the device can be moved at will in the work area, adapting to the material transfer requirements of different workstations.

[0022] The embodiment also includes two winch mechanisms 2, two lifting arms 3 and two rotating mechanisms 5.

[0023] Specifically, each winch mechanism 2 is a high-power variable frequency winch, and the surface of the drum of each winch mechanism 2 is provided with an anti-skid rope groove; one end of the steel wire rope is fixed to the drum through a rope presser, and the other end is guided after the end of the corresponding lifting arm 3, and the terminal end is connected with a lifting hook (not shown in the figure) adapted to different goods; the winding and unwinding of the steel wire rope is realized by the forward and reverse rotation of the drum of the winch mechanism 2, thereby driving the lifting hook to complete the lifting action of the goods.

[0024] Secondly, the two hoisting arms 3 are respectively hinged to the two sides of the carrying platform 1 through first hinge seats, the first hinge seats are high-strength pin shaft hinge structures, the pin shaft surfaces are subjected to quenching treatment and are coated with wear-resistant lubricating grease, so that the flexibility and long-term reliability of the hoisting arms 3 when rotating around the first hinge seats are ensured. Each hoisting arm 3 corresponds to each winch mechanism 2, and the length thereof is adapted to the conventional operation radius requirement. The pulley blocks 4 for winding the corresponding steel wires are installed at the ends of the hoisting arms 3 away from the first hinge seats. The winch mechanisms 2, the hoisting arms 3 and the pulley blocks 4 cooperatively constitute a group of independent lifting units, and each group of lifting units can independently complete the lifting, lowering and translation of goods, and do not interfere with each other.

[0025] In addition, the two rotating mechanisms 5 are installed on the top of the carrying platform 1, each rotating mechanism 5 corresponds to each hoisting arm 3, and is used for rotating the corresponding hoisting arm 3 outward or inward around the first hinge seat to adapt to different hoisting requirements.

[0026] When the two hoisting arms 3 are rotated outward to the preset positions, the distance between the two hoisting points is far, and the two groups of lifting units independently lift the goods, and do not interfere with each other. In the normal state, two pieces of goods can be independently hoisted, and the transfer efficiency of batch materials is greatly improved.

[0027] When the two hoisting arms 3 are rotated inward to the preset positions, the distance between the two hoisting points is close, and the two groups of lifting units synchronously and jointly lift the goods, so that oversized and overweight goods can be hoisted, which not only solves the problem of instability of traditional double-head gantry cranes caused by the large distance between the hoisting points, but also makes up for the insufficient power and carrying capacity of a single lifting unit.

[0028] With the above design, there are two modes of “independent operation mode” and “linkage heavy load mode”, which are as follows: 1. Independent operation mode (adapted to conventional goods batch transfer); When it is necessary to hoist conventional goods, the carrying platform 1 is moved to the target operation area of the goods, and the two hoisting arms 3 correspond to the upper parts of the two pieces of goods, respectively. Then, the operator hooks the hooks of the two groups of lifting units to the centers of gravity of the corresponding goods, respectively. Then, the two winch mechanisms 2 are started and independently controlled to drive the two pieces of goods to be lifted through the winding and unwinding of the steel wires, and the goods are transferred to the preset target position through the horizontal movement of the carrying platform 1. After reaching the target position, the two winch mechanisms 2 independently control the steel wires to be lowered, and the goods are unloaded.

[0029] 2. Linkage heavy load mode (adapted to hoisting of oversized and overweight single-piece goods); When it is necessary to hoist a single piece of oversized and overweight cargo, the carrying platform 1 is first moved to a preset hoisting area above the cargo; then, the rotating mechanism 5 is started to drive the two lifting arms 3 to rotate inward around the first hinge seat until the lifting arms 3 reach the preset position; at this time, the lifting point distance of the two groups of lifting units is greatly shortened, which is suitable for the reasonable lifting point range of the oversized cargo; then, the operator hangs the hooks of the two groups of lifting units to the preset lifting points at both ends of the cargo; the winch mechanism 2 is started, and the two groups of lifting units output power synchronously to lift the cargo, avoiding the problem of insufficient power of a single group of lifting units; during the cargo transfer process, the carrying platform 1 moves, and the winch mechanism 2 keeps synchronous operation to ensure that the cargo is always in a horizontal stable state; after reaching the target position, the two groups of winch mechanisms 2 are synchronized to lower the cargo, completing the unloading.

[0030] In the conventional scheme, each lifting arm 3 usually corresponds to only one group of pulley blocks 4, that is, a single lifting unit only forms one lifting point. When hoisting conventional cargo, the lifting point can be aligned with the middle region where the center of gravity of the cargo is located, which basically meets the stable hoisting requirement. However, when facing a single piece of oversized and overweight cargo, even if the two groups of lifting units work simultaneously, only two lifting points can be formed; and the oversized and overweight cargo often has the characteristics of large volume and uneven weight distribution, and when hoisting through only two lifting points, it is easy to tilt and twist, which seriously affects the safety and stability of the operation. In order to solve this problem, the following design is made: The pulley blocks 4 installed at the ends of the lifting arms 3 have two groups, the axes of the two groups of pulley blocks 4 are on the same straight line, and are both perpendicular to the length direction of the lifting arms 3, so as to ensure that the stress direction of the steel wire rope after winding is consistent and avoid additional torque generated by eccentric load. Steel wire ropes are independently wound on each group of pulley blocks 4, that is, the two groups of pulley blocks 4 matched with a single lifting arm 3 correspond to two steel wire ropes of the same winch mechanism 2, forming two independent lifting points, and the winding and unwinding speeds of the two steel wire ropes are kept consistent to ensure that the two lifting points on the same lifting arm 3 move synchronously and avoid uneven force on the cargo due to asynchronous movement.

[0031] It is worth mentioning that the two groups of pulley blocks 4 are slidably connected to the ends of the lifting arms 3 through the guide rail-sliding block structure, and the two groups of pulley blocks 4 can move closer to or away from each other along the axis.

[0032] When the two lifting arms 3 are rotated outward to the preset position (conventional cargo batch transfer), the two groups of pulley blocks 4 move closer to each other, and the corresponding two lifting points move closer to each other and are located in the middle region where the center of gravity of the cargo is located; after the winch mechanism 2 is started, the two steel wire ropes are wound and unwound synchronously to ensure that the cargo is balanced.

[0033] When both of the two hangers 3 rotate inwardly to the preset position (overweight cargo transfer), the two groups of pulley blocks 4 are away from each other, so that the two lifting points are located on the front and back sides of the cargo end to form a symmetrical support structure, cooperating with the two lifting points of the other group of lifting units to jointly form a stable four-point lifting support system. During operation, the four groups of steel wire ropes jointly lift the cargo, not only dispersing the concentrated load of the cargo, but also limiting the tilting and twisting degrees of the cargo through symmetrical support, greatly improving the stability and balance during the lifting process of heavy cargo.

[0034] It should be added that the top of the carrying platform 1 is fixedly installed with a stand 6, which is located between the two hoist mechanisms 2 to avoid interference with the installation of the hoist mechanisms 2 and the winding path of the steel wire ropes; the two rotating mechanisms 5 are respectively installed on the two sides of the stand 6 to ensure the symmetry and reliability of power transmission.

[0035] In the present embodiment, the rotating mechanism 5 includes a first truss 501 extending in the horizontal direction, one end of the first truss 501 being hinged to the side surface of the stand 6 through a second hinge seat. The second hinge seat is a high-strength pin shaft structure, the surface of the pin shaft being quenched and coated with long-acting lubricating grease to ensure the flexibility and long-term use reliability of the first truss 501 when rotating therearound.

[0036] A third hinge seat is hinged to one end of the hanger 3 close to the pulley block 4, and is slidingly connected to the bottom of the first truss 501 through a guide rail-sliding block structure. The third hinge seat can move along the length direction of the first truss 501, and then rotate the hanger 3 around the first hinge seat through the lever principle.

[0037] The following describes how the third hinge seat moves along the length direction of the first truss 501: The bottom of the first truss 501 is fixedly installed with a first linear sliding table 502, the execution end of which can move along the length direction of the first truss 501, and the third hinge seat is fixedly installed on the execution end of the first linear sliding table 502.

[0038] When the execution end of the first linear sliding table 502 extends outwardly along the length direction of the first truss 501, the third hinge seat pushes the hanger 3 to rotate outwardly around the first hinge seat and unfold; when the execution end retracts inwardly, it pulls the hanger 3 to rotate inwardly around the first hinge seat and fold, completing the switching of the operation mode.

[0039] It should be added that in the present embodiment, the movement of the third hinge seat is driven by the first linear sliding table 502, but during the cargo lifting operation, the hanger 3 will bear various loads such as the gravity of the cargo, horizontal wind force, vibration impact, etc., which will be transmitted to the execution end of the first linear sliding table 502 through the third hinge seat. If only the locking force of the execution end itself is relied on to bear the load, the risk of execution end failure is likely to occur.

[0040] To solve this problem, the third hinged seat guide rail-slid structure is added to the independent mechanical limit locking mechanism, which is composed of a bolt body and a driving assembly. The bolt body is made of high-strength alloy round steel, one end is a conical guide head, the other end is connected with the driving assembly to ensure the rigid connection after locking. The driving assembly adopts spring pre-tightening + electromagnetic unlocking design, the outside of the bolt body is equipped with a reset spring, which is in a compressed state under normal circumstances, providing continuous ejection driving force for the bolt. At the same time, a micro electromagnetic coil is configured, which generates suction force to pull back the bolt when energized, realizing unlocking. The bolt body is transversely embedded in the slider inside the third hinged seat, perpendicular to the sliding direction of the slider, and the ejection direction of the bolt is aligned with the rail base at the bottom of the first truss 501. On the rail base at the bottom of the first truss 501, corresponding to the "preset independent working position" and "preset linkage working position" of the boom 3, positioning holes matched with the bolt body are respectively set.

[0041] When the third hinged seat is in place, the electromagnetic coil of the mechanical limit locking mechanism is de-energized, the compression potential energy of the reset spring is released, and the bolt body is quickly ejected and inserted into the positioning hole on the rail base. The bolt and the positioning hole form a rigid connection, completely locking the third hinged seat with the first truss 501, at this time the posture of the boom 3 is fixed and cannot be displaced, greatly reducing the load pressure of the first linear slide 502 and prolonging the service life of the linear slide.

[0042] The following describes how the two groups of pulley blocks 4 approach or move away from each other along the axis in this embodiment: The first truss 501 is provided with a sliding groove 7 corresponding to each of the two groups of pulley blocks 4, each sliding groove 7 includes a first straight line segment, an inclined line segment and a second straight line segment arranged in sequence along the length direction of the first truss 501; the distance between the two first straight line segments is less than the distance between the two second straight line segments.

[0043] Each pulley block 4 is fixedly connected with a sliding rod 8 that is in sliding cooperation with the corresponding sliding groove 7, and the axis of the sliding rod 8 is perpendicular to the axis of the pulley block 4. When the sliding rod 8 is located in the first straight line segment, the two groups of pulley blocks 4 are gathered together; when the sliding rod 8 slides to the second straight line segment, the two groups of pulley blocks 4 are separated from each other, realizing the switching of the distance between the lifting points.

[0044] When the third hinged seat slides along the length direction of the first truss 501, it drives the sliding rod 8 to slide along the sliding groove 7, so that the two groups of pulley blocks 4 approach or move away from each other. The approach / separation action of the pulley blocks 4 is synchronized with the rotation action of the boom 3, without the need for additional manual intervention or separate control, which not only improves the operation efficiency, but also avoids the problem of mechanism interference or lifting point misalignment caused by different actions.

[0045] With the above design, when switching to the independent operation mode, the execution end of the first linear slide 502 extends outward, pushing the third hinged seat to move outward along the first truss 501, and driving the boom 3 to rotate outward around the first hinged seat; in this process, the sliding rod 8 on the pulley block 4 slides along the second linear segment to the oblique segment, and then to the first linear segment of the sliding groove 7, as the distance between the first linear segments is small, the sliding rod 8 drives the two sets of pulley blocks 4 to approach each other under the constraint of the sliding groove 7, until the boom 3 reaches the preset independent operation position, the sliding rod 8 is completely clamped into the first linear segment, and the pulley blocks 4 are locked in the converging position.

[0046] When switching to the linkage heavy load mode, the execution end of the first linear slide 502 retracts inward, pulling the third hinged seat to move inward along the first truss 501, and driving the boom 3 to rotate inward around the first hinged seat; at this time, the sliding rod 8 slides along the first linear segment to the oblique segment, and then to the second linear segment of the sliding groove 7, as the distance between the second linear segments is large, the sliding rod 8 drives the two sets of pulley blocks 4 to move away from each other under the guidance of the sliding groove 7, until the boom 3 reaches the preset linkage operation position, the sliding rod 8 is clamped into the second linear segment, and the pulley blocks 4 are locked in the separated position.

[0047] Embodiment two: please refer to Figures 5 to 7 The embodiment also proposes a linkage type double-head door crane, which is different from embodiment one in that: The rotating mechanism 5 includes a second truss 503 extending in the horizontal direction, one end of the second truss 503 is hinged to the boom 3 through a fourth hinged seat, and a fifth hinged seat is hinged to the other end of the second truss 503, and the fifth hinged seat is also connected to the side surface of the stand 6 through a guide rail-sliding block structure.

[0048] The fifth hinged seat can move up and down along the side surface of the stand 6 to rotate the boom 3 around the first hinged seat.

[0049] The following describes how the fifth hinged seat moves up and down: The side surface of the stand 6 is fixedly installed with a second linear slide 504, the execution end of the second linear slide 504 can move up and down, and the fifth hinged seat is fixedly installed on the execution end of the second linear slide 504.

[0050] When the execution end of the second linear slide 504 moves upward, the end of the second truss 503 is pushed upward by the fifth hinged seat, and the boom 3 is pulled to rotate inward around the first hinged seat, until it reaches the preset independent operation position.

[0051] It should be noted that on the basis of the guide rail and sliding block structure of the fifth hinge seat, an independent mechanical limiting and locking mechanism is also added, which can lock the fifth hinge seat when it moves into place, so that the posture of the boom 3 is fixed and cannot be displaced, greatly reducing the load pressure of the second linear sliding table 504 and prolonging the service life of the linear sliding table.

[0052] The following describes how the two groups of pulley blocks 4 approach or move away from each other along the axis in this embodiment: Each connecting rope 10 is connected to the upright frame 6 after passing through a guide on the second truss 503. The guide is a guide pulley with built-in self-lubricating bearings, which is fixed to the second truss 503 through a bracket. The axis of the guide pulley is adapted to the direction of the force of the connecting rope 10, converting sliding friction into rolling friction, greatly reducing wear and tension loss.

[0053] When the boom 3 rotates outward to the preset position, each connecting rope 10 is in a relaxed state, and each return spring 9 is in a natural extension state, so that the two groups of pulley blocks 4 approach each other; When the boom 3 rotates inward to the preset position, each connecting rope 10 is in a taut state, and each return spring 9 is in a compressed state, so that the two groups of pulley blocks 4 move away from each other.

[0054] With the above design, when switching to the independent operation mode, the execution end of the second linear sliding table 504 moves downward, driving the boom 3 to rotate outward around the first hinge seat and unfold; as the boom 3 unfolds, the second truss 503 synchronously swings downward, the length of the connecting rope 10 gradually increases, and then it is in a relaxed state, having no tension on the pulley block 4.

[0055] At this time, the return spring 9 maintains a natural extension state, and under the action of the spring's own elastic force, it pushes the two groups of pulley blocks 4 closer to each other until they slide to the preset pulley gathering position, corresponding to the two lifting points gathering and aligning with the center of gravity area of the goods, laying a foundation for subsequent stable lifting.

[0056] When switching to the linkage heavy load mode, the execution end of the second linear sliding table 504 moves upward, driving the boom 3 to rotate inward around the first hinge seat and fold; as the boom 3 folds, the second truss 503 synchronously swings upward, the connecting rope 10 is gradually tightened, and then generates tension along the axis direction of the pulley block 4.

[0057] The pulling force overcomes the elastic force of the reset spring 9, pulls the two sets of pulley blocks 4 away from each other, until the jib 3 reaches the preset linkage operation position, and the pulley blocks 4 slide to the preset pulley separation position; at this time, the two lifting points corresponding to the two sets of pulley blocks 4 are respectively located on the front and rear sides of the end of the cargo, and cooperate with the two lifting points of the other set of lifting units to form four-point symmetrical support, ensuring stable hoisting of heavy cargo.

[0058] It should be noted that, in this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0059] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary and that changes in form and detail can be made without departing from the spirit and scope of the application. The scope of the application is defined by the appended claims and their equivalents.

Claims

1. A linked double door hanger comprising a carrying platform, characterized in that, Also include: Two winch mechanisms, both of which are fixedly installed on the top of the carrying platform, and both of which are wound with steel wires on the winding drums; Two lifting arms, both of which are hingedly connected to the two sides of the carrying platform through first hinged seats, and each of which corresponds to a winch mechanism; each lifting arm is provided with a pulley block at the end thereof away from the first hinged seat for winding the corresponding steel wire; The winch mechanism cooperates with the corresponding lifting arm and pulley block to form an independent lifting unit; Two rotating mechanisms, both of which are installed on the top of the carrying platform, and each of which corresponds to a lifting arm for rotating the corresponding lifting arm outward or inward around the first hinged seat; When both of the lifting arms are rotated outward to the preset positions, the two lifting units independently lift the goods respectively; 2. The linked double door operator of claim 1, wherein: When both of the lifting arms are rotated inward to the preset positions, the two lifting units synchronously lift the goods together.

3. A linked double door closer according to claim 2, wherein: The pulley blocks installed at the ends of the lifting arms have two groups, and the axes of the two groups of pulley blocks are on the same straight line, and each group of pulley blocks is independently wound with a steel wire. Both of the two groups of pulley blocks are slidingly connected to the ends of the lifting arms, and the two groups of pulley blocks can move towards or away from each other along the axes; When both of the lifting arms are rotated outward to the preset positions, the two groups of pulley blocks move towards each other; 4. The linked double door operator of claim 3 wherein: When both of the lifting arms are rotated inward to the preset positions, the two groups of pulley blocks move away from each other.

5. The linked double door operator of claim 4 wherein: The top of the carrying platform is fixedly provided with a stand, and the stand is located between the two winch mechanisms, and the two rotating mechanisms are respectively installed on the two sides of the stand. The rotating mechanism comprises a first truss extending in the horizontal direction, one end of the first truss is hingedly connected to the side of the stand through a second hinged seat; One end of the lifting arm close to the pulley block is hingedly connected with a third hinged seat, and the third hinged seat is slidingly connected to the bottom of the first truss; 6. A linked double door operator as claimed in claim 5 wherein: The third hinged seat can move along the length direction of the first truss to rotate the lifting arm around the first hinged seat.

7. The linked double door operator of claim 5 wherein: The bottom of the first truss is fixedly provided with a first linear slide, and the execution end of the first linear slide can move along the length direction of the first truss, and the third hinged seat is fixedly installed on the execution end of the first linear slide. The first truss is provided with a sliding groove corresponding to each group of pulley blocks, and each sliding groove comprises a first linear segment, an oblique segment and a second linear segment arranged in sequence along the length direction of the first truss; the distance between the two first linear segments is smaller than the distance between the two second linear segments; A sliding rod slidingly matched with the corresponding sliding groove is fixedly connected to each pulley block; 8. The linked double door operator of claim 4 wherein: When the third hinged seat slides along the length direction of the first truss, the sliding rod slides along the sliding groove to move the two groups of pulley blocks towards or away from each other. The rotating mechanism comprises a second truss extending in the horizontal direction, one end of the second truss is hingedly connected with the lifting arm through a fourth hinged seat, and the other end of the second truss is hingedly connected with a fifth hinged seat, and the fifth hinged seat is slidingly connected to the side of the stand; 9. A linked double door closer according to claim 8, wherein: The fifth hinged seat can move up and down along the side of the stand to rotate the lifting arm around the first hinged seat. The side of the stand is fixedly provided with a second linear slide, and the execution end of the second linear slide can move up and down, and the fifth hinged seat is fixedly installed on the execution end of the second linear slide.

10. The linked double door operator of claim 8, wherein: Reset springs and connecting ropes are connected to the sides of the two sets of pulley blocks away from each other; The ends of the reset springs away from the pulley blocks are connected to the boom, and the ends of the connecting ropes away from the pulley blocks are connected to the vertical frame after winding around the guide on the second truss; When the boom rotates outward to a preset position, the connecting ropes are in a relaxed state, and the reset springs are in a natural stretched state, so that the two sets of pulley blocks are close to each other; When the boom rotates inward to a preset position, the connecting ropes are in a taut state, and the reset springs are in a compressed state, so that the two sets of pulley blocks are away from each other.

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