Crown block product anti-falling device

Abstract

The invention relates to a crown block product anti-falling device which comprises a support assembly, a plane hinge assembly and a clamping assembly. The plane hinge assembly comprises a crank, a lever, a rocker, a first connecting rod and a second connecting rod. The first connecting rod is connected with the crank and a power arm of the lever, the second connecting rod is connected with a resisting arm and a rocker of the lever and used for being supported below a product on a crown block, the crank, the power arm of the lever and the first connecting rod form a crank-connecting rod mechanism, and the resisting arm of the lever, the rocker and the second connecting rod form a double-rocker mechanism. The driving assembly is used for driving the crank to rotate; the clamping assembly is used for clamping the side of a product on the crown block. Through linkage cooperation of the crank connecting rod mechanism and the double-rocker mechanism, the crank connecting rod mechanism drives the double-utilization dead point position to achieve mechanism self-locking, driving equipment is stressed only when the double-rocker mechanism is switched between the unfolding state and the folding state, and meanwhile the light connecting rod structure design is adopted; the service life of driving equipment can be prolonged, and the overall weight of the anti-falling device of the crown block product can be reduced.

Description

Technical Field

[0001] This invention relates to the field of high-altitude transportation technology, and in particular to a fall prevention device for overhead crane products. Background Art

[0002] In semiconductor manufacturing, wafers need to be moved and transferred between different workstations. Wafers are typically carried in wafer cassettes and transferred using overhead hoist transfer (OHT). An OHT generally consists of an overhead track and a transport trolley, often simply called an overhead crane. The overhead crane is equipped with retractable and lifting gripping devices. The crane moves along the track, which in turn drives the gripping devices to move and transfer the wafers. After gripping the wafer cassette, the gripping devices move the wafer along the track at a relatively high speed. During this movement, the overhead crane experiences acceleration, deceleration, and curves, resulting in some degree of swaying of the wafer cassette. To improve the stability of wafer cassette handling and reduce the risk of wafer cassette falls, existing overhead cranes typically incorporate mechanisms to prevent product drops. The overhead crane fall arrestor has an extended and a retracted state. When extended, it supports the product under the overhead crane and clamps it to the side. When retracted, it avoids the lifting trajectory of the crane's gripping device and the product. Existing overhead crane fall arrestors typically maintain the extended state through a drive mechanism, which bears the reaction force during clamping, reducing the lifespan of the drive mechanism. Furthermore, existing fall arrestors use a motor and lead screw for transmission, resulting in significant weight. Improving the lifespan of the drive mechanism and reducing the weight of the overhead crane fall arrestor are pressing technical problems that need to be solved in this field. Summary of the Invention

[0003] Therefore, the present invention provides a fall protection device for overhead crane products, which improves the lifespan of the drive equipment of the fall protection device and reduces the weight of the fall protection device.

[0004] To solve the above-mentioned technical problems, the present invention provides a fall protection device for overhead crane products, comprising: A support assembly includes a support, hinge shaft A, hinge shaft B, and hinge shaft C. The support is used for fixed connection with an overhead crane, and hinge shaft A, hinge shaft B, and hinge shaft C are connected to the support. A planar hinged assembly includes a crank, a lever, a rocker arm, a first connecting rod, a second connecting rod, hinge shafts D, E, F, and G. The crank is connected to hinge shaft A, the lever is connected to hinge shaft B, and the rocker arm is connected to hinge shaft C. One end of the first connecting rod is connected to the crank via hinge shaft D, and the other end of the first connecting rod is connected to the power arm of the lever via hinge shaft E. One end of the second connecting rod is connected to the resistance arm of the lever via hinge shaft F, and the other end of the second connecting rod is connected to the rocker arm via hinge shaft G. The second connecting rod is used to support the product below on the overhead crane. The crank, the power arm of the lever, and the first connecting rod form a crank-connecting rod mechanism, and the resistance arm of the lever, the rocker arm, and the second connecting rod form a double rocker arm mechanism. A drive assembly, including a drive device mounted on the bracket, for driving the crank to rotate; A clamping assembly, including a clamping mechanism mounted on the resistance arm of the lever and / or the rocker arm, for clamping the product on the side of the overhead crane; In the first state, the crank connecting mechanism moves to the first dead point position, the double rocker mechanism is in the unfolded state, the second connecting rod is located below the product on the overhead crane, and the clamping mechanism is located on the side of the product on the overhead crane. In the second state, the crank connecting mechanism moves to the second dead point position, the double rocker mechanism is in the retracted state, and the second connecting rod and the clamping mechanism are both located at the position to avoid the gripping device on the overhead crane and the downward trajectory of the product.

[0005] Furthermore, in the first state, the hinge axis A is located between the hinge axis D and the hinge axis E; In the second state, the hinge axis D is located between the hinge axis A and the hinge axis E.

[0006] Furthermore, in the first state, the hinge shaft B, the hinge shaft C, the hinge shaft F, and the hinge shaft G are located at the four corners of the same parallelogram, the crank rocker mechanism is located on the side of the parallelogram away from the product, and the clamping mechanism is located inside the parallelogram. In the second state, hinge shafts B, C, F, and G are located on the same straight line, and the crank rocker mechanism and the clamping mechanism are located on the side of the straight line away from the product.

[0007] Furthermore, the clamping mechanism is mounted on the resistance arm of the lever, and in the second state, the resistance arm of the lever swings to the side where the rocker arm is located.

[0008] Furthermore, the parallelogram is a rectangle.

[0009] Furthermore, the hinge shaft A and the hinge shaft C are located on the same side of the hinge shaft B.

[0010] Furthermore, the clamping mechanism includes a base, a telescopic block, a clamping block, and a gel buffer layer. The base is connected to the dual rocker mechanism. The telescopic block is telescopically connected to the base along the clamping direction. The clamping block is connected to the telescopic block and contacts the product on the overhead crane through its arc-shaped surface. The gel buffer layer is connected between the telescopic block and the base.

[0011] Furthermore, the clamping assembly includes two clamping mechanisms for clamping the product on the same side of the overhead crane.

[0012] Furthermore, the clamping assembly also includes a clamping position detection mechanism, which is mounted on the hinge shaft B.

[0013] Furthermore, the driving device is a stepper motor, and the driving assembly also includes a coupling and a drive shaft. The drive shaft is connected to the motor through the coupling and to the crank.

[0014] Compared with the prior art, the above-mentioned technical solution of the present invention has the following advantages: The overhead crane product fall prevention device disclosed in the present invention, through the linkage of the crank connecting rod mechanism and the double rocker mechanism, the drive device drives the double rocker mechanism to unfold and retract through the crank connecting rod mechanism. When the double rocker mechanism is unfolded, it can prevent the product on the overhead crane from falling. When the double rocker mechanism is retracted, it can avoid the lifting and lowering of the product on the overhead crane. The normal state of the double rocker mechanism is unfolded or retracted. Under the normal state of the double rocker mechanism, the crank connecting rod mechanism uses the dead point position to achieve mechanism self-locking. The drive device is only subjected to force when the double rocker mechanism switches between unfolded and retracted states, which extends the service life of the drive device. At the same time, a lightweight connecting rod structure design is adopted to reduce the overall weight of the overhead crane product fall prevention device. Attached Figure Description

[0015] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0016] Figure 1 This is a perspective view of the anti-fall device for the overhead crane product of the present invention in its first state. Figure 2 This is a top view of the crane product anti-fall device of the present invention in its first state; Figure 3 This is a top view of the anti-fall device for the overhead crane product of the present invention in its second state; Figure 4 This is a schematic diagram of the clamping mechanism of the present invention; Figure 5 This is a schematic diagram of the composition of the driving component of the present invention.

[0017] Explanation of reference numerals in the accompanying drawings: 11. Bracket; 12. Hinge A; 13. Hinge B; 14. Hinge C; 21. Crank; 22. Lever; 23. Rocker arm; 24. First connecting rod; 25. Second connecting rod; 26. Hinge D; 27. Hinge E; 28. Hinge F; 29. ​​Hinge G; 31. Drive device; 32. Coupling; 33. Drive shaft; 41. Clamping mechanism; 411. Base; 412. Telescopic block; 413. Clamping block; 414. Gel buffer layer; 42. Clamping position detection mechanism. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0019] See Figures 1 to 5 As shown, this invention provides an embodiment of the anti-fall device for overhead crane products.

[0020] The anti-fall devices for overhead crane products include: The support assembly includes a support, hinge shaft A, hinge shaft B, and hinge shaft C. The support 11 is used for fixed connection with the overhead crane. The hinge shafts A12, B13, and C14 are all connected to the support 11. A planar hinge assembly includes a crank 21, a lever 22, a rocker arm 23, a first connecting rod 24, a second connecting rod 25, hinge shafts D26, E27, F28, and G29. The crank 21 is connected to hinge shaft A12, the lever 22 is connected to hinge shaft B13, the rocker arm 23 is connected to hinge shaft C14, and one end of the first connecting rod 24 is connected to the crank 21 via hinge shaft D26. The other end is connected to the power arm of the lever 22 via the hinge shaft E27. One end of the second link 25 is connected to the resistance arm of the lever 22 via the hinge shaft F28. The other end of the second link 25 is connected to the rocker arm 23 via the hinge shaft G29. The crank 21, the power arm of the lever 22 and the first link 24 form a crank-connecting rod mechanism. The resistance arm of the lever 22, the rocker arm 23 and the second link 25 form a double rocker mechanism. The drive assembly includes a drive device 31, which is mounted on the bracket 11 and is used to drive the crank 21 to rotate. The clamping assembly includes a clamping mechanism 41, which is mounted on the resistance arm of the lever 22 and / or the rocker arm 23 for clamping the product on the side of the overhead crane. In the first state, the drive assembly drives the crank connection mechanism to move to the first dead point position, the double rocker mechanism is in the unfolded state, the second connecting rod 25 is located below the product on the overhead crane, and the clamping mechanism 41 is located on the side of the product on the overhead crane. In the second state, the aforementioned drive component drives the aforementioned crank connection mechanism to move to the second dead point position, the aforementioned double rocker mechanism is in the retracted state, and the aforementioned second connecting rod 25 and the aforementioned clamping mechanism 41 are both located at the position to avoid the gripping device on the overhead crane and the product's downward trajectory.

[0021] In the above text, the crank-connecting rod mechanism refers to a four-bar linkage in which the rotating crank 21 drives the lever 22 to swing, achieving self-locking through the dead center position. The double rocker mechanism refers to a four-bar linkage in which the lever 22 and the rocker 23 form a linkage structure through a connecting rod, achieving switching between support and avoidance states through geometric deformation. The clamping mechanism 41 refers to the component that applies lateral constraints to the wafer cassette.

[0022] Specifically, when the drive device 31 rotates the crank 21 to the first dead center position, the crank-connecting rod mechanism enters a self-locking state, at which point the double rocker mechanism unfolds into a quadrilateral structure. The second connecting rod 25 extends horizontally to the bottom of the wafer cassette to form a support surface. Simultaneously, the resistance arm of the lever 22 drives the clamping mechanism 41 to move inward to clamp the side wall of the wafer cassette. When the drive device 31 rotates the crank 21 to the second dead center position, the crank-connecting rod mechanism self-locks again, and the double rocker mechanism retracts, causing the second connecting rod 25 and the clamping mechanism 41 to move outside the crane's movement trajectory. During this process, the drive device 31 only needs to provide driving force when switching states; the maintenance of the unfolded and retracted states relies on the geometric characteristics of the mechanism itself.

[0023] Through the above technical solution, by linking the crank-connecting rod mechanism and the double rocker mechanism, the drive device 31 drives the double rocker mechanism to unfold and retract through the crank-connecting rod mechanism. When the double rocker mechanism is unfolded, it can prevent products on the crane from falling. When the double rocker mechanism is retracted, it can avoid the lifting and lowering of products on the crane. The normal state of the double rocker mechanism is unfolded or retracted. Under the normal state of the double rocker mechanism, the crank-connecting rod mechanism uses the dead point position to achieve mechanism self-locking. The drive device 31 is only subjected to force when the double rocker mechanism switches between unfolded and retracted states, which extends the service life of the drive device. At the same time, a lightweight connecting rod structure design is adopted to reduce the overall weight of the crane product fall prevention device.

[0024] In this embodiment, in the first state, the hinge shaft A12 is located between the hinge shaft D26 and the hinge shaft E27; in the second state, the hinge shaft D26 is located between the hinge shaft A12 and the hinge shaft E27.

[0025] In the above text, "hinged shaft A12 is located between hinged shafts D26 and E27" means that hinged shaft A12 is positioned midway between hinged shafts D26 and E27, which connect the two ends of the first connecting rod, in the crank-connecting rod mechanism's motion trajectory. This arrangement allows the crank-connecting rod mechanism to enter the first dead center position, at which point the crank-connecting rod mechanism self-locks. "Hinged shaft D26 is located between hinged shafts A12 and E27" means that after crank 21 rotates, hinged shaft D26 moves to the position between hinged shafts A12 and E27. This can be achieved by the drive device 31 rotating crank 21 around hinged shaft A12 by a certain angle to form a new collinear state of the three points. This state allows the crank-connecting rod mechanism to enter the second dead center position, also triggering the self-locking of the crank-connecting rod mechanism.

[0026] By using the above technical solution, the crank-rocker mechanism achieves two self-locking mechanisms by changing the positions of hinge shaft D26 and hinge shaft E27.

[0027] In this embodiment, in the first state, the hinge shafts B13, C14, F28 and G29 are located at the four corners of the same parallelogram, the crank rocker mechanism is located on the side of the parallelogram away from the product, and the clamping mechanism 41 is located inside the parallelogram. In the second state, the aforementioned hinge shafts B13, C14, F28, and G29 are located on the same straight line, and the aforementioned crank rocker mechanism and clamping mechanism 41 are located on the side of the straight line away from the product.

[0028] In the above text, the four corner positions of the parallelogram refer to the spatial arrangement of the four hinge axes forming a quadrilateral structure with two sets of opposite sides of equal length. The straight-line arrangement means that the four hinge axes are collinear when folded, achieving a compact folding structure. The arrangement of the crank-rocker mechanism away from the product side avoids interference in the mechanism's movement through spatial misalignment, and the clamping mechanism 41's placement inside the parallelogram allows the clamping force to act directly on the side of the product.

[0029] Specifically, in the unfolded state, the geometry of the parallelogram enables the dual rocker mechanism to form a self-locking structure. The reaction force generated by the clamping mechanism is evenly transmitted to the support through the parallelogram connecting rods, eliminating the need for continuous power output from the drive device to maintain the clamping state. In the folded state, the four hinge axes are arranged in a straight line, allowing the second connecting rod and the clamping mechanism to fold synchronously to a position away from the product's movement trajectory. This linear layout minimizes the size of the folded mechanism. The switching between the parallelogram structure and the linear arrangement is triggered by the dead point position of the crank-connecting rod mechanism, utilizing the mechanism's kinematic characteristics to achieve automatic locking between the two states.

[0030] Through the above technical solution, the deformation of the parallelogram allows the second link 25 and the clamping mechanism 41 to change their positions, enabling switching between the extended and retracted states. Furthermore, in the retracted state, the linear arrangement of the hinge shafts reduces the space occupied by the fall arrestor.

[0031] In this embodiment, the clamping mechanism 41 is mounted on the resistance arm of the lever 22. In the second state, the resistance arm of the lever 22 swings to the side where the rocker arm 23 is located.

[0032] In the above text, the resistance arm of lever 22 refers to the end opposite to the power arm, which is linked to rocker arm 23 via second link 25. Swinging to the side where rocker arm 23 is located means that when the resistance arm is in the retracted state, its end deflects towards rocker arm 23, thus limiting the movement trajectory of the double rocker mechanism within a predetermined range.

[0033] Specifically, when the device switches to the second state, the crank-connecting rod mechanism drives the first connecting rod 24 to move. The first connecting rod 24 pulls the power arm of the lever 22, causing the resistance arm to rotate around the hinge axis B, forcing the resistance arm of the lever 22 to deflect towards the rocker arm 23. The clamping mechanism moves synchronously with the resistance arm to a position away from the product. Its spatial trajectory is automatically determined by the kinematic characteristics of the double rocker mechanism, without the need for additional drive equipment to control the displacement.

[0034] With the above technical solution, since the crank 21 and rocker arm 23 are located on the same side of the lever 22, in the second state, the resistance arm of the lever 22 swings toward the side where the rocker arm 23 is located, making the planar hinge assembly in the second state more compact.

[0035] In this embodiment, the parallelogram is a rectangle.

[0036] In the above text, the parallelogram being a rectangle refers to the geometric characteristics of the four-bar linkage structure consisting of hinge shafts B13, C14, F28, and G29, where all four interior angles are right angles and opposite sides are parallel and of equal length.

[0037] Specifically, assuming the line connecting hinge axis B and hinge axis C is one base of the parallelogram, and the line connecting hinge axis F28 and hinge axis G29 is the other base of the parallelogram, when the parallelogram is a rectangle, the perpendicular distance between the two bases of the parallelogram is the largest, which makes the size of the double rocker mechanism unfolding towards the side where the product is located on the crane the largest.

[0038] By using the above technical solution, the parallelogram is set as a rectangle to ensure that the size of the double rocker mechanism is as large as possible when it is unfolded, so as to better support and clamp the products on the crane.

[0039] In this embodiment, the hinge shaft A12 and the hinge shaft C14 are located on the same side of the hinge shaft B13.

[0040] In the above text, by concentrating hinge shafts A12 and C14 on the same side of hinge shaft B13, the positions of the crank-connecting rod mechanism and the double rocker mechanism can be constrained. When hinge shafts A12 and C14 are located on the same side of hinge shaft B13, crank 21 and rocker 23 are located on the same side of lever 22.

[0041] By using the above technical solution, and by placing hinge shaft A12 and hinge shaft C on the same side of hinge shaft B13, the planar hinge assembly becomes more compact, minimizing the space occupied by the planar hinge assembly.

[0042] In this embodiment, the clamping mechanism 41 includes a base 411, a telescopic block 412, a clamping block 413, and a gel buffer layer 414. The base 411 is connected to the dual rocker mechanism. The telescopic block 412 is telescopically connected to the base 411 along the clamping direction. The clamping block 413 is connected to the telescopic block and contacts the product on the overhead crane through its arc-shaped surface. The gel buffer layer 414 is connected between the telescopic block 412 and the base 411.

[0043] In the above text, clamping block 413 refers to the component that contacts the side wall of the product on the overhead crane, and the surface of its contact with the product on the overhead crane is an arc-shaped surface. Gel buffer layer 414 refers to the elastic medium disposed between clamping block 413 and the double rocker mechanism, used for flexible contact with the product and absorption of vibration and shock.

[0044] Specifically, when the dual rocker mechanism drives the clamping mechanism 41 to contact the product sidewall, the clamping block 413 first contacts the product surface, at which point the gel buffer layer 414 is compressed and undergoes elastic deformation. The reaction force generated during clamping is transmitted to the gel layer through the clamping block 413, preventing the dual rocker mechanism from being subjected to instantaneous load fluctuations and achieving a buffering effect.

[0045] Through the above technical solution, by setting the clamping mechanism 41 to include a base 411, a telescopic block 412, a clamping block 413 and a gel buffer layer 414, the clamping mechanism 41 avoids hard contact with the product, prevents over-clamping of the product, and plays a role in protecting the product. At the same time, it can absorb vibration and play a role in shock absorption.

[0046] In this embodiment, two clamping mechanisms 41 are included, which are used to clamp the product on the same side of the overhead crane.

[0047] In the above text, "same side" refers to a side of the product on the overhead crane in the direction of travel or in a stationary state. The two clamping mechanisms 41 are distributed along the same side to form a two-point clamping.

[0048] Specifically, the two clamping mechanisms 41 act on the same side of the product, forming a symmetrically distributed clamping force through synchronous clamping actions. When the product is subjected to lateral vibration or impact loads, the two clamping mechanisms 41 simultaneously share the load, avoiding structural deformation or overload of the drive equipment caused by concentrated force at a single clamping point, and increasing the clamping area, which is more conducive to clamping stability. In the retracted state, the two clamping mechanisms synchronously return in the direction away from the product.

[0049] By using the above technical solution and setting up two clamping mechanisms 41, the problem of uneven clamping force distribution caused by single-point clamping is solved, the load is evenly distributed, and the lateral constraint effect on the product is improved.

[0050] In this embodiment, a clamping position detection mechanism 42 is also included, which is mounted on the hinge shaft B13.

[0051] In the above text, the clamping position detection mechanism 42 refers to a sensing device used to detect the rotation angle of the lever 22 around the hinge shaft B13. Specifically, it can be implemented using an angle sensor or a photoelectric encoder. By detecting the rotation angle of the hinge shaft B13, it determines whether the clamping mechanism 41 has reached the preset position. The rotation angle of the hinge shaft B directly reflects the relative position change between the resistance arm of the lever 22 and the rocker arm 23, serving as a direct basis for judging the clamping state.

[0052] Specifically, when the dual rocker mechanism moves to the unfolded state, the resistance arm of lever 22 drives rocker 23 to form a specific angle through the second link 25. At this time, the rotation angle of lever 22 around hinge axis B13 reaches a preset threshold. The clamping position detection mechanism 42 is set to trigger a position signal when the rotation angle reaches this threshold, and the drive device 31 stops operating after receiving the signal.

[0053] Through the above technical solution, the clamping position detection mechanism 42 enables accurate judgment of the clamping position. The drive device 31 can stop operating immediately after receiving the position signal, thus avoiding the double rocker mechanism from being incompletely or excessively deployed.

[0054] In this embodiment, the driving device 31 is a stepper motor, and the driving assembly further includes a coupling 32 and a drive shaft 33. The drive shaft 33 is connected to the motor through the coupling 32, and the drive shaft 33 is connected to the crank 21.

[0055] As described above, a stepper motor is a control motor that converts electrical pulse signals into precise mechanical displacement. It drives the rotor to rotate step by step by receiving pulse signals. Each pulse input causes the rotor to rotate by a fixed angle (called the "step angle"). The coupling 32 and drive shaft 33 are used to transmit the power of the stepper motor to the crank-connecting rod mechanism.

[0056] Specifically, when the stepper motor rotates, it drives the coupling 32 to rotate, which in turn drives the drive shaft 33 to rotate, which in turn drives the crank 21 to rotate. The rotation of the crank 21 causes the lever 22 to swing, and the swing of the lever 22 causes the rocker arm 23 to swing.

[0057] Through the above technical solution, the crank 21 can be directly driven to rotate by the above drive component, so as to realize the deployment and retraction of the anti-fall device of the overhead crane product.

[0058] The overhead crane product fall prevention device of the present invention is used in an overhead crane system. The overhead crane system includes a track, an overhead crane, a gripper device, and two of the above-mentioned overhead crane product fall prevention devices. The overhead crane is movably connected to the track, and the gripper device is connected to the overhead crane for gripping products. The two overhead crane product fall prevention devices are respectively located on both sides of the movement trajectory of the gripper device. In a first state, the second connecting rod is located below the product on the overhead crane, and the clamping mechanism is located on the side of the product on the overhead crane. In a second state, both the second connecting rod and the clamping mechanism are located to avoid the gripping device and the downward trajectory of the product on the overhead crane.

[0059] In the above text, the overhead rail refers to the track structure that supports the movement of the overhead crane, providing a directional movement path for the crane. The overhead crane refers to the equipment at one end that moves along the overhead rail, serving as the mounting base for the gripping device and fall arrestor. The gripper device refers to the mechanical component used to hold the wafer cassette. The fall arrestors for the two overhead crane products are symmetrically distributed on both sides of the gripper device, which can be achieved using a mirrored installation method to ensure balanced gripping force on both sides of the product. The avoidance downward trajectory means that the fall arrestor, when retracted, does not interfere with the movement path of the gripping device, thus eliminating obstruction to the lifting and lowering of the wafer cassette.

[0060] Specifically, the movement process of the above-mentioned overhead crane system includes the following steps: S1, the overhead crane moves to the material handling station, and the anti-fall devices on both sides are in the retracted state; S2, the gripping device descends to grab the product and rises to the set height; S3, the anti-fall devices on both sides switch to the extended state, providing support and clamping for the product; S4, the overhead crane moves to the material unloading station; S5, the anti-fall devices on both sides switch to the retracted state; S6, the gripping device descends to release the product and rises to the set height.

[0061] Through the above technical solution, during the process of the overhead crane moving from the material handling station to the material unloading station, the anti-fall devices on both sides always support and clamp the product to prevent the product from falling accidentally.

[0062] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A fall protection device for overhead crane products, characterized in that, include: A support assembly includes a support, hinge shaft A, hinge shaft B, and hinge shaft C. The support is used for fixed connection with an overhead crane, and hinge shaft A, hinge shaft B, and hinge shaft C are connected to the support. A planar hinged assembly includes a crank, a lever, a rocker arm, a first connecting rod, a second connecting rod, hinge shafts D, E, F, and G. The crank is connected to hinge shaft A, the lever is connected to hinge shaft B, and the rocker arm is connected to hinge shaft C. One end of the first connecting rod is connected to the crank via hinge shaft D, and the other end of the first connecting rod is connected to the power arm of the lever via hinge shaft E. One end of the second connecting rod is connected to the resistance arm of the lever via hinge shaft F, and the other end of the second connecting rod is connected to the rocker arm via hinge shaft G. The second connecting rod is used to support the product below on the overhead crane. The crank, the power arm of the lever, and the first connecting rod form a crank-connecting rod mechanism, and the resistance arm of the lever, the rocker arm, and the second connecting rod form a double rocker arm mechanism. A drive assembly, including a drive device mounted on the bracket, for driving the crank to rotate; A clamping assembly, including a clamping mechanism mounted on the resistance arm of the lever and / or the rocker arm, for clamping the product on the side of the overhead crane; In the first state, the crank connecting mechanism moves to the first dead point position, the double rocker mechanism is in the unfolded state, the second connecting rod is located below the product on the overhead crane, and the clamping mechanism is located on the side of the product on the overhead crane. In the second state, the crank connecting mechanism moves to the second dead point position, the double rocker mechanism is in the retracted state, and the second connecting rod and the clamping mechanism are both located at the position to avoid the gripping device on the overhead crane and the downward trajectory of the product.

2. The anti-fall device for overhead crane products according to claim 1, characterized in that, In the first state, hinge axis A is located between hinge axis D and hinge axis E; In the second state, the hinge axis D is located between the hinge axis A and the hinge axis E.

3. The anti-fall device for overhead crane products according to claim 1, characterized in that, In the first state, hinge shaft B, hinge shaft C, hinge shaft F and hinge shaft G are located at the four corners of the same parallelogram, the crank rocker mechanism is located on the side of the parallelogram away from the product, and the clamping mechanism is located inside the parallelogram. In the second state, hinge shafts B, C, F, and G are located on the same straight line, and the crank rocker mechanism and the clamping mechanism are located on the side of the straight line away from the product.

4. The anti-fall device for overhead crane products according to claim 3, characterized in that, The clamping mechanism is mounted on the resistance arm of the lever. In the second state, the resistance arm of the lever swings to the side where the rocker arm is located.

5. The anti-fall device for overhead crane products according to claim 3, characterized in that, The parallelogram is a rectangle.

6. The anti-fall device for overhead crane products according to claim 1, characterized in that, The hinge shaft A and the hinge shaft C are located on the same side of the hinge shaft B.

7. The anti-fall device for overhead crane products according to claim 1, characterized in that, The clamping mechanism includes a base, a telescopic block, a clamping block, and a gel buffer layer. The base is connected to the dual rocker mechanism. The telescopic block is telescopically connected to the base along the clamping direction. The clamping block is connected to the telescopic block and contacts the product on the overhead crane through an arc-shaped surface. The gel buffer layer is connected between the telescopic block and the base.

8. The anti-fall device for overhead crane products according to claim 1, characterized in that, The clamping assembly includes two clamping mechanisms for clamping the product on the same side of the overhead crane.

9. The anti-fall device for overhead crane products according to claim 1, characterized in that, The clamping assembly further includes a clamping position detection mechanism, which is mounted on the hinge shaft B.

10. The overhead crane product fall prevention device according to claim 1, characterized in that, The driving device is a stepper motor, and the driving assembly further includes a coupling and a drive shaft. The drive shaft is connected to the motor through the coupling and is connected to the crank.

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