Goods stacking device for logistics storage and stacking method thereof

Abstract

The present application relates to the technical fields of roadway stacking machinery, and discloses a goods stacking device for logistics storage and a stacking method thereof. The device comprises a motor, a reduction gear box, a driving rope cylinder, a safety protection rope cylinder, a cargo loading platform, a traction wheel, a safety wheel frame and a buffer mechanism. The motor drives the driving rope cylinder and the safety protection rope cylinder to rotate synchronously through the reduction gear box. The traction wire rope on the driving rope cylinder is reversed by the traction wheel and then fixed to the cargo loading platform, which is used to drive the cargo loading platform to lift and lower to complete the warehousing and de-warehousing of goods. The safety wire rope on the safety protection rope cylinder is connected to the cargo loading platform through the safety wheel frame, and the bottom of the safety wheel frame is provided with a buffer piston rod which is pushed upward by a spring. Under normal conditions, the spring moves the safety wheel frame upward and tightens the safety wire rope. When the rope is broken, the safety wire rope bears the traction force of the cargo loading platform to prevent falling, and at the same time, the buffer piston rod is compressed to realize damping buffer, so as to avoid the safety wire rope from being broken due to excessive instantaneous impact force, thereby realizing the safety protection of broken rope.

Description

Technical Field

[0001] This invention relates to the technical field of roadway stacking machinery, and in particular to a cargo stacking device and stacking method for logistics warehousing. Background Technology

[0002] A cargo stacking device for logistics warehousing is a highly efficient mechanized device that uses a stacker crane as its driving carrier, moves horizontally along tracks within warehouse aisles, and achieves vertical movement through a lifting mechanism, thereby automating the inbound and outbound processes of goods within the warehousing system. This type of device is widely used in e-commerce logistics centers, manufacturing line-side warehouses, pharmaceutical warehouses, and cold chain warehousing, and is a core piece of equipment for automating warehousing operations and improving space utilization.

[0003] In existing technologies, the lifting operation of stacker cranes in aisle tunnels typically uses a lifting mechanism to traction steel wire ropes. This involves a motor driving a drum to wind and unwind the wire rope, causing the loading platform to move up and down along the guide rails, thus transferring goods between different height levels. However, under long-term, repeated alternating loads, micro-cracks gradually develop and propagate within the steel wires, leading to irreversible fatigue elongation. Because this process is gradual and insidious, it is difficult for operators to detect in a timely manner through visual observation or simple measurement during routine inspections. Often, the elongation of the wire rope exceeds the safety threshold before it is noticed.

[0004] More seriously, when the wire rope breaks due to accumulated fatigue or sudden overloading, the loading platform and the goods it carries will lose their restraint, posing a risk of direct fall. This could not only cause damage to goods and equipment but also easily lead to serious safety accidents such as personal injury or death. Furthermore, current technologies typically rely on periodic manual inspections or planned replacements, resulting in high maintenance costs and failing to fundamentally eliminate the safety hazards caused by sudden rope breakage. Therefore, there is an urgent need for a cargo stacking device capable of effectively monitoring the fatigue state of wire ropes and providing safety protection against rope breakage, in order to improve the safety and reliability of warehousing operations. Summary of the Invention

[0005] This invention proposes a cargo stacking device and method for logistics warehousing, which has the advantages of monitoring the fatigue state of wire ropes and protecting against rope breakage. It solves the problems mentioned in the background art, such as the difficulty in timely detection of fatigue elongation of wire ropes and the risk of cargo falling and causing safety accidents after rope breakage.

[0006] To achieve the above objectives, this application adopts the following technical solution: A cargo stacking device for logistics warehousing, comprising: a frame, with a loading platform movably installed on the inner side and an electrical control unit installed on the side; a lifting motor, fixed to one side of the frame, with a reduction gearbox installed on the output shaft of the lifting motor, and a safety protection rope drum installed at the output end of the reduction gearbox, and a drive rope drum installed on the shaft of the safety protection rope drum; a traction steel wire rope, one end fixed to the drive rope drum, the side reversing via a traction sheave installed on the top of the frame, and the other end fixed to the loading platform; a safety wheel frame, movably installed on the top of the frame, and a buffer cylinder installed on the side of the frame, with a buffer piston rod fixedly connected to the bottom of the safety wheel frame inside the buffer cylinder, the bottom end of the buffer piston rod being connected to the buffer cylinder. A spring is fixedly connected between the inner bottom and the platform. A safety wire rope is fixed at one end to a safety protection rope drum, reversed in the middle via a safety wheel frame, and fixed at the other end to the loading platform. Under normal conditions, the traction wire rope applies traction to the loading platform, driving it to move up and down along the frame. The buffer piston rod, pushed by the spring force, keeps the safety wire rope taut via the safety wheel frame. When the traction wire rope breaks, the weight of the loading platform and the load act on the safety wire rope. The safety wire rope, via the safety wheel frame, pushes the buffer piston rod downwards and compresses the spring in the buffer cylinder, using the elastic deformation of the spring to buffer and decelerate the descent of the loading platform. Simultaneously, the safety wire rope provides reverse traction to the loading platform, preventing the platform and goods from falling.

[0007] Furthermore, the diameter of the safety wire rope is larger than that of the traction wire rope.

[0008] Furthermore, a one-way air intake valve is fixedly installed at the bottom of the buffer cylinder, which enables external air to flow unidirectionally into the inner cavity of the buffer cylinder; a damping hole is provided at the bottom of the buffer cylinder.

[0009] Furthermore, a position detection switch is fixedly installed on the outside of the buffer cylinder, and the position detection switch is electrically connected to the electronic control unit.

[0010] Furthermore, in the first connection method between the safety protection drum and the drive drum, the two are coaxially fixedly connected.

[0011] Furthermore, in the second connection method between the safety protection drum and the drive drum, a torque limiting component is connected between the shafts of the safety protection drum and the drive drum. The torque limiting component can cut off power transmission when the load exceeds a preset safe torque value.

[0012] Furthermore, the torque limiting component mainly consists of a driven disc, a drive disc, an intermediate ring sleeve, a friction plate, and an elastic component. The driven disc is fixedly connected to the shaft of the drive rope drum, and the drive disc is fixedly connected to the shaft of the safety protection rope drum. An intermediate ring sleeve is movably installed on the inner side of the end of the drive disc. A friction plate is fixedly installed on one end of the intermediate ring sleeve, and an elastic component is fixedly installed on the end of the drive disc, with the elastic component abutting against the intermediate ring sleeve.

[0013] Furthermore, a one-way toothed rack is fixedly installed on the side of the loading platform, and a one-way gear corresponding to the one-way toothed rack is fixedly installed coaxially at the end of the drive rope drum. After the one-way toothed rack presses down on the one-way gear, it restricts the one-way gear from rotating in one direction.

[0014] Furthermore, a left conductive disk is fixedly installed on the outer side of the driven disk, and an annular groove is opened on the end of the left conductive disk facing the drive disk, in which a conductive arc block is fixedly installed; a right conductive disk is installed on the outer side of the drive disk, and a locking bolt is threadedly connected to the side of the right conductive disk, and a contact rod arranged facing the annular groove on the left conductive disk is fixedly installed at the end of the right conductive disk; a conductive brush is fixedly installed on the side of the frame, and the conductive brush is attached to the outer side of the right conductive disk and the left conductive disk respectively. The wires on the conductive brushes are electrically connected to the electronic control unit. After the contact rod and the conductive arc block come into contact, an electrical circuit is formed from the electronic control unit - wire - first conductive brush - right conductive disk - contact rod - conductive arc block - left conductive disk - second conductive brush - wire - electronic control unit.

[0015] A method for stacking goods for logistics warehousing includes the following steps: S1. After the traction steel wire rope passes through the traction sheave, fix one end to the loading platform to keep the traction steel wire rope in a taut state; fix the safety steel wire rope after passing through the safety wheel frame to the loading platform, and make the safety wheel frame move down through the buffer piston rod to apply pre-compression to the spring in the buffer cylinder, so that the spring is in an energy storage state.

[0016] S2. The forks on the loading platform carry the goods, and the platform is horizontally transferred along the track by the wheels at the bottom of the frame. The electrical control unit controls the lifting motor to drive the drive drum to wind up the traction steel wire rope through the reduction gearbox, and at the same time drives the safety protection drum to wind up the safety steel wire rope, pulling the loading platform up along the column to the target floor height to complete the goods entering the warehouse. When leaving the warehouse, the reverse operation of the above process is performed.

[0017] S3. When the traction steel wire rope breaks during the traction of the loading platform, the loading platform falls under its own weight and the weight of the cargo, pulling the safety steel wire rope down synchronously. The safety steel wire rope drives the safety wheel frame down and pushes the buffer piston rod to compress the spring in the buffer cylinder a second time. The elastic force of the spring is used to buffer and decelerate the fall of the loading platform, preventing the safety steel wire rope from breaking due to excessive instantaneous impact tension.

[0018] The beneficial effects of this invention are as follows: In the intelligent manufacturing equipment industry, to achieve fatigue monitoring and rope breakage safety protection for wire ropes in stacker cranes in aisle systems, this invention provides a cargo stacking device and method for logistics warehousing. A motor, via a reduction gearbox, synchronously drives the safety protection rope drum and the drive rope drum to rotate, creating a double-rope redundant structure between the safety wire rope and the traction wire rope. Under normal conditions, a spring pushes a buffer piston rod to move the safety wheel frame upwards, maintaining appropriate tension in the safety wire rope and not affecting normal deployment and retraction operations. When the traction wire rope unexpectedly breaks, the safety wire rope immediately absorbs the traction force of the loading platform, effectively preventing the platform from losing restraint and falling. Simultaneously, the downward traction of the loading platform pulls the safety wire rope to press down on the safety wheel frame, and the buffer piston rod applies pressure to the spring to achieve buffering damping, preventing secondary breakage of the safety wire rope due to excessive instantaneous impact force, fundamentally eliminating the safety hazard of a broken rope falling from the stacker crane in an aisle system.

[0019] Meanwhile, this invention features a positioning detection switch on the outer side of the buffer cylinder. Under normal conditions, the spring pushes the buffer piston rod upwards until it touches the positioning detection switch, at which point the electronic control unit determines that the wire rope is in normal condition. As the stacker crane operates for extended periods, the traction wire rope undergoes fatigue elongation, increasing the downward traction force of the loading platform. The safety wheel frame drives the buffer piston rod downwards, gradually moving it away from the positioning detection switch. When the buffer piston rod completely disengages from the positioning detection switch, the electronic control unit receives a signal and issues an alarm, prompting the operator to replace the wire rope promptly. This structure requires no additional sensors, utilizing mechanical displacement to directly trigger detection, achieving low-cost, high-reliability online monitoring of the wire rope's fatigue state. This aligns with the intelligent manufacturing equipment industry's development needs for intelligent and safe warehousing equipment.

[0020] This invention adds a safety protection rope drum, safety wheel frame and buffer mechanism to the original aisle stacker crane lifting mechanism. The drive logic is compatible with the original system and does not require major changes to the overall control architecture of the aisle stacker crane. It is easy to apply to existing automated warehousing production lines in the intelligent manufacturing equipment industry. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort: Figure 1 and Figure 2 This is a schematic diagram of the overall external three-dimensional structure of the present invention; Figure 3 This is a schematic diagram of the overall external planar structure of the present invention; Figure 4This is a schematic diagram of the installation position and internal three-dimensional structure of the buffer cylinder of the present invention; Figure 5 This is a schematic diagram of the installation positions and three-dimensional structure of the components at the motor output end of the present invention; Figure 6 This is a schematic diagram of the installation position and three-dimensional structure of the conductive sliding brush of the present invention; Figure 7 This is a schematic diagram of the installation position and external three-dimensional structure of the conductive disk of the present invention; Figure 8 This is a three-dimensional structural diagram of the torque limiting component of the present invention.

[0022] In the diagram: 1. Frame; 2. Electrical control unit; 3. Cargo platform; 4. Lifting motor; 5. Reduction gearbox; 6. Safety protection rope drum; 7. Drive rope drum; 8. Safety wire rope; 9. Traction wire rope; 10. Traction sheave; 11. Safety wheel frame; 12. Buffer cylinder; 121. Buffer piston rod; 122. One-way air intake valve; 123. Damping orifice; 13. Position detection switch; 14. One-way gear; 15. One-way gear rack; 16. Torque limiting assembly; 161. Driven disc; 162. Drive disc; 163. Intermediate ring; 164. Friction plate; 17. Right conductive disc; 171. Electric contact rod; 172. Locking bolt; 18. Left conductive disc; 181. Conductive arc block; 19. Conductive sliding brush. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Example 1, please refer to Figure 1 and Figure 2It can be seen that the bottom movable limiter of frame 1 is installed on the track on the aisle floor. A travel motor is installed on frame 1, which drives the travel wheels to run along the track, thereby enabling frame 1 to shuttle back and forth horizontally in the aisle with shelves, completing the horizontal transfer of goods between different aisle storage locations. A loading platform 3 is vertically guided and movable on the inner side of frame 1. The loading platform 3 can move up and down along the column guide rail on frame 1 to realize the vertical transfer of goods between storage locations at different heights. The loading platform 3 is equipped with forks, which have a telescopic controllable function. During inbound operations, the forks extend to receive goods onto the loading platform 3 for temporary storage. Then, the loading platform 3 rises along the column guide rail to the target height, and the forks extend again to deliver the goods to the corresponding storage location. During outbound operations, the forks extend to the target storage location to retrieve the goods and retract to the loading platform 3. After the loading platform 3 descends to ground level, the forks deliver the goods to the conveyor line or the outbound end.

[0025] An electrical control unit 2, which supplies power and regulates the entire machine, is fixedly installed on one side of the frame 1. A lifting motor 4 is fixedly installed on the side of the frame 1 furthest from the electrical control unit 2. A reduction gearbox 5 is fixedly installed on the output shaft of the lifting motor 4. The reduction gearbox 5 is preferably a worm gear reducer. The reduction gearbox 5 ensures that the loading platform 3 can reliably hover at any height, preventing accidental falls due to power outages or brake failure, thus providing mechanical assurance for safe hovering. Figure 1 and Figure 2 As can be seen, a safety protection rope drum 6 is fixedly installed at the output end of the reduction gearbox 5. In this embodiment, a drive rope drum 7 is installed on the shaft end of the safety protection rope drum 6 away from the reduction gearbox 5, and the two are coaxially and fixedly connected. When the electronic control unit 2 inputs a start signal to the lifting motor 4, the lifting motor 4 rotates in a controllable direction. When the lifting motor 4 drives the reduction gearbox 5 to rotate in a directional manner, the reduction gearbox 5 synchronously drives the safety protection rope drum 6 and the drive rope drum 7 to rotate. It should be noted that a support is fixedly installed on the side of the frame 1. The support is movably connected to the rotating shafts of the safety protection rope drum 6 and the drive rope drum 7 respectively using bearings to ensure that the safety protection rope drum 6 and the drive rope drum 7 are stably installed.

[0026] A traction sheave 10 is fixedly installed on one side of the top of the frame 1. Correspondingly, a traction steel wire rope 9 is fixedly installed on the outer side of the drive rope drum 7. After the traction steel wire rope 9 is reversed by the traction sheave 10, its end is fastened to the loading platform 3. In this way, when the reduction gearbox 5 drives the drive rope drum 7 to wind / unwind, the winding / unwinding of the traction steel wire rope 9 by the drive rope drum 7 enables the traction steel wire rope 9 to pull the loading platform 3 to move up and down in a directional manner, so as to transport the goods on the loading platform 3 to the target floor height. This method is also a common traction method in traditional aisle stacker cranes.

[0027] A safety wheel frame 11 is mounted on one side of the top of the frame 1 using guide rails. The safety wheel frame 11 is limited to reciprocating up-and-down movement by the guide rails. Furthermore, combined with... Figure 4 It can be seen that a buffer cylinder 12 is fixedly mounted on the side of the frame 1 using feet, and a buffer piston rod 121 is movably fitted inside the buffer cylinder 12. The top shaft of the buffer piston rod 121 is fixedly mounted to the bottom of the safety wheel frame 11. When the safety wheel frame 11 moves up and down along the guide rail, it synchronously drives the buffer piston rod 121 to move up and down inside the buffer cylinder 12. A spring is fixedly connected between the bottom end of the buffer piston rod 121 and the bottom inner side of the buffer cylinder 12. Pushed by the spring, the buffer piston rod 121 always tends to push the safety wheel frame 11 upwards. Figure 1 As can be seen, a safety wire rope 8 is fixedly installed on the outside of the safety protection rope drum 6, and after the safety wire rope 8 is reversed by the safety wheel frame 11, its end is fixedly connected to the loading platform 3. In the event of a breakage of the traction wire rope 9, the safety wire rope 8 provides safety protection for the loading platform 3. Ideally, the diameter of the safety wire rope 8 is larger than that of the traction wire rope 9, so that the breaking tensile force of the safety wire rope 8 is greater than that of the traction wire rope 9, meeting the load-bearing requirements under the condition of rope breakage protection.

[0028] In practical applications, the stacking method of this first embodiment is as follows: The installation process of the safety wire rope 8: Under normal conditions, the traction wire rope 9 on the outside of the drive drum 7 is wound around the traction sheave 10, and one end is fixedly connected to the loading platform 3. At this time, the traction wire rope 9 is in a taut state and bears all the traction force on the loading platform 3. The installation method of the safety wire rope 8 is the same. More specifically, after the safety wire rope 8 is installed, the safety wheel frame 11 needs to move downward through the buffer piston rod 121 to apply a certain degree of pre-compression to the spring in the buffer cylinder 12, so that the spring is in an energy storage state. This pre-compression amount can reserve sufficient upward movement stroke for the buffer piston rod 121 to ensure that the spring has sufficient ejection margin when the safety wire rope 8 is relaxed later. It can be seen that the drive drum 7 bears the active traction force on the loading platform 3, while the safety wire rope 8 relies on the spring to push the safety wheel frame 11 through the buffer piston rod 121 to maintain a constant tension force, and the two do not interfere with each other.

[0029] Stacking and transportation process: During operation, the forks on the loading platform 3 are used to transport the goods to be stored or retrieved onto the loading platform 3. Then, the traveling wheels at the bottom of the frame 1 run along the track to achieve horizontal transfer of the loading platform 3 between different aisle locations. After reaching the horizontal position, the electrical control unit 2 inputs an upward signal to the lifting motor 4. The lifting motor 4, after being reduced in speed and torque by the reduction gearbox 5, drives the drive drum 7 to rotate and winds up the traction steel wire rope 9. At the same time, the safety protection drum 6 winds up the safety steel wire rope 8. During this process, the drive drum 7 pulls the loading platform 3 upward along the column to the target floor height by winding up the traction steel wire rope 9. When the loading platform 3 reaches the designated floor height, the forks on the loading platform 3 are used to pick up the goods and place them on the shelf, completing the warehousing operation; the outbound operation is the reverse of the above process.

[0030] Rope breakage protection process: During normal operation, the traction wire rope 9 bears the entire weight of the loading platform 3 and the cargo, while the safety wire rope 8 is only under tension and does not participate in active load bearing. If the traction wire rope 9 unexpectedly breaks while tractioning the loading platform 3, the loading platform 3 will rapidly fall under its own weight and the weight of the cargo, immediately pulling the safety wire rope 8 downwards in sync. The downward pull of the safety wire rope 8 causes the safety wheel frame 11 to descend, which in turn pushes the buffer piston rod 121 downwards and compresses the spring inside the buffer cylinder 12. At this time, the elastic force of the spring buffers the downward movement of the safety wheel frame 11, gradually absorbing the kinetic energy of the falling loading platform 3, preventing the safety wire rope 8 from breaking again due to excessive instantaneous impact tension, thus ensuring that the loading platform 3 decelerates and stops within a controllable speed, ensuring the safety of personnel and cargo.

[0031] Example 2 is a supplement to Example 1, combined with Figure 4 As shown, in this second embodiment, the buffer piston rod 121 is preferably sealed and connected to the inner side of the buffer cylinder 12. Furthermore, a one-way air inlet valve 122 is fixedly installed at the bottom of the buffer cylinder 12, which allows external air to flow unidirectionally into the inner cavity of the buffer cylinder 12. A damping hole 123 is provided at the bottom of the buffer cylinder 12 on one side of the one-way air inlet valve 122. When the buffer piston rod 121 moves downward, it compresses the air in the inner cavity of the buffer cylinder 12, and the air in the inner cavity of the buffer cylinder 12 slowly flows out from the damping hole 123, thereby achieving the effect of air buffering and damping, and further improving the damping effect of the safety wheel frame 11 on the safety wire rope 8 after the traction wire rope 9 breaks unexpectedly.

[0032] Based on this, combined Figure 4 It can be seen that a position detection switch 13 is fixedly installed on the upper part of the outer side of the buffer cylinder 12. The position detection switch 13 is electrically connected to the electronic control unit 2. When the buffer piston rod 121 moves to the position detection switch 13, the position detection switch 13 will input an electrical signal to the electronic control unit 2.

[0033] In practical application, this second embodiment: Installation and Adjustment of Safety Wire Rope 8: The installation of safety wire rope 8 and traction wire rope 9 is performed according to the method described in Example 1. It is particularly important to note that during the installation of safety wire rope 8, the safety wheel frame 11 is adjusted downwards and the buffer piston rod 121 is pushed, applying a pre-compression force to the spring in the buffer cylinder 12, causing the spring to be in an energy-storing state. The safety wheel frame 11 continues to descend until the buffer piston rod 121 moves to the position of the positioning detection switch 13. At this time, the buffer piston rod 121 contacts the positioning detection switch 13, triggering the switch and inputting an activation signal to the electronic control unit 2. After receiving this signal, the electronic control unit 2 determines that the buffer piston rod 121 is in the normal initial position, and the system determines that the installation is in place, the status is normal, and the equipment can operate normally.

[0034] Fatigue Monitoring Process: With prolonged stacking operations, the traction steel wire rope 9, which bears the traction load for extended periods, will experience fatigue elongation due to repeated stretching. The safety steel wire rope 8, however, does not bear active traction under normal operating conditions; it is only in a pre-tensioned state and has a larger diameter than the traction steel wire rope 9. Therefore, its fatigue elongation is extremely small and negligible compared to the elongation of the traction steel wire rope 9. As the fatigue elongation of the traction steel wire rope 9 gradually accumulates, its tension is insufficient to fully support the weight of the loading platform 3. At this point, the loading platform 3, under its own weight and the weight of the cargo, descends along the column until the traction steel wire rope 9 is re-tensioned and returns to its tensioned state. Simultaneously, the descent of the loading platform 3, through the traction of the safety steel wire rope 8, causes the safety wheel frame 11 to descend synchronously, further pushing the buffer piston rod 121 downwards to compress the spring, causing a secondary compression of the spring. As the buffer piston rod 121 continues to descend, it gradually moves away from and disengages from the trigger area of ​​the positioning detection switch 13.

[0035] Alarm and Shutdown Process: After the buffer piston rod 121 completely disengages from the position detection switch 13, the position detection switch 13 stops sending an energizing signal to the electronic control unit 2. Upon not receiving an energizing signal from the position detection switch 13, the electronic control unit 2 determines that the buffer piston rod 121 has deviated from its initial normal position, thus inferring that the fatigue elongation of the traction wire rope 9 has exceeded the preset threshold, and the wire rope will reach the scrap standard. Subsequently, the electronic control unit 2 executes a shutdown and alarm. During the alarm, the electronic control unit 2 inputs a trigger signal to the alarm component, which emits an audible or visual warning, prompting the operator that the equipment needs maintenance and replacement of the traction wire rope 9. The alarm component is typically an electric bell or a fault alarm light, installed within the operator's visual / audible range to ensure effective communication of the warning information.

[0036] Since the alarm component is triggered when the buffer piston rod 121 disengages from the position detection switch 13, it can be concluded from the content of Embodiment 1 that when the traction steel wire rope 9 breaks unexpectedly, the loading platform 3 will be subjected to its own weight and the weight of the cargo, which will directly act on the safety steel wire rope 8. On the one hand, the spring and air damping mentioned above will be used for elastic buffering, and on the other hand, the buffer piston rod 121 will move away from the position detection switch 13 and trigger the alarm.

[0037] Example 3 is a further improvement on Example 1. As a second connection method between the safety protection drum 6 and the drive drum 7, unlike Example 1, a torque limiting component 16 is connected between the shafts of the safety protection drum 6 and the drive drum 7. The torque limiting component 16 can cut off power transmission when the load exceeds a preset safe torque value, protecting the core components from overload damage. More specifically, in conjunction with... Figure 5 and Figure 8 As can be seen, the torque limiting assembly 16 mainly consists of a driven disc 161, a drive disc 162, an intermediate ring 163, a friction plate 164, and an elastic component. The driven disc 161 is fixedly connected to the shaft of the drive drum 7 via a flange, and the drive disc 162 is fixedly connected to the shaft of the safety protection drum 6 via a flange. One end of the driven disc 161 is inserted into the inner cavity of the drive disc 162, and a bearing is installed between them, thereby limiting the relative rotation between the driven disc 161 and the drive disc 162. An intermediate ring 163 is movably mounted on the inner side of the end of the drive disc 162 near the driven disc 161. The intermediate ring 163 can only reciprocate horizontally along the axial direction of the drive disc 162. A friction plate 164 is fixedly mounted on one end of the intermediate ring 163 near the driven disc 161. The friction plate 164 is usually made of asbestos-free wear-resistant material. An elastic component, typically an adjusting bolt and a spring, is fixedly mounted on the end of the drive disc 162. One end of the spring abuts against the intermediate ring 163, and the other end abuts against the adjusting bolt. There are multiple springs and adjusting bolts to ensure that the intermediate ring 163 has sufficient strength to move towards the driven disc 161.

[0038] In practical applications, this third embodiment is as follows: Under normal conditions, the intermediate ring 163, under the continuous push of the spring force, forces the friction plate 164 on the intermediate ring 163 to press against the end face of the driven disk 161. At this time, sufficient static friction is generated between the friction plate 164 and the driven disk 161, and the two maintain synchronous rotation without relative slippage. After the lifting motor 4 is reduced in speed and torque is increased by the reduction gearbox 5, it drives the safety protection rope drum 6 to rotate; the safety protection rope drum 6 transmits torque to the drive rope drum 7 through the friction transmission between the friction plate 164 and the driven disk 161 in the torque limiting component 16, so that the drive rope drum 7 rotates synchronously, and finally realizes the up and down movement of the loading platform 3 along the column of the frame 1 as described in Embodiment 1.

[0039] During the goods receiving process, the forks on the loading platform 3 transport the goods onto the loading platform 3. If the weight of the goods is too heavy and exceeds the rated load, the resistance torque that needs to be overcome when driving the drum 7 to rotate will be greater than the maximum static friction force between the friction plate 164 and the driven disc 161. At this time, relative sliding occurs between the friction plate 164 and the driven disc 161, and the torque limiting component 16 automatically cuts off the power transmission between the safety protection drum 6 and the driving drum 7 to prevent the traction wire rope 9 from breaking due to overload.

[0040] Meanwhile, the lifting motor 4 continues to drive the safety protection rope drum 6 to rotate via the reduction gearbox 5, and the safety protection rope drum 6 continues to wind up the safety wire rope 8. Due to the excessive weight of the goods on the loading platform 3, the traction force on the safety wire rope 8 increases sharply, and the downward tension of the safety wire rope 8 on the safety wheel frame 11 increases accordingly.

[0041] Under the increased downward pulling force, the safety wheel frame 11 pushes the buffer piston rod 121 downward rapidly, and the buffer piston rod 121 gradually moves away from the position detection switch 13. When the buffer piston rod 121 completely disengages from the position detection switch 13, the position detection switch 13 stops inputting the connection signal to the electronic control unit 2. As described in Embodiment 2, the electronic control unit 2 determines that the fatigue elongation of the traction steel wire rope 9 has exceeded the preset threshold, and then executes the shutdown and alarm actions.

[0042] It should be noted that when the traction strength of the safety wire rope 8 increases, causing the safety wheel frame 11 to descend and push the buffer piston rod 121, the air in the buffer cylinder 12 will theoretically generate a buffering damping effect through the damping hole 123. However, due to the compressibility of air, in the initial stage when the buffer piston rod 121 descends and compresses the inner cavity of the buffer cylinder 12, the air in the inner cavity of the buffer cylinder 12 will be compressed and absorbed first, rather than being immediately discharged through the damping hole 123. Therefore, in the initial stage, the buffer piston rod 121 can descend relatively quickly and will not be excessively hindered by the throttling resistance of the damping hole 123. This ensures that the buffer piston rod 121 can quickly disengage from the position detection switch 13 after an overload occurs, so that the electronic control unit 2 does not receive the signal from the position detection switch 13 in the shortest possible time, thereby triggering a shutdown and alarm, and avoiding delays in protection action due to buffering damping delay. After the air is compressed to a certain extent, the throttling damping of the damping orifice 123 gradually takes effect, forming a stable deceleration buffer for the subsequent downward movement of the buffer piston rod 121, preventing the cargo platform 3 from falling too fast.

[0043] Example 4 is a supplement to Example 3, from Figure 1 and Figure 2It can be seen that the side of the loading platform 3 has a one-way gear rack 15 fixedly installed using a corner bracket. Correspondingly, a one-way gear 14, arranged corresponding to the one-way gear rack 15, is coaxially fixedly installed at the end of the drive rope drum 7. The teeth of both the one-way gear 14 and the one-way gear rack 15 are approximately isosceles triangular sawtooth structures. When the one-way gear rack 15 presses against the one-way gear 14, it can restrict the one-way gear 14 from rotating in one direction. Furthermore, generally speaking, after the loading platform 3 falls to its bottom limit, the one-way gear rack 15 will be in a meshing and pressing state with the one-way gear 14. When the loading platform 3 is normally exchanging goods with the conveyor line or the outbound end, the height of the loading platform 3 is generally above this limit position.

[0044] Combination Figures 5-8 It can be seen that a left conductive disk 18 is fixedly installed on the outer side of the driven disk 161, and an annular groove is formed on the end of the left conductive disk 18 facing the drive disk 162. A conductive arc block 181 is fixedly installed in the annular groove, and the length of the conductive arc block 181 can be selected according to actual needs. Correspondingly, a right conductive disk 17 is installed on the outer side of the drive disk 162, and a locking bolt 172 is threadedly connected to the side of the right conductive disk 17. By tightening the locking bolt 172 and pressing it against the side of the drive disk 162, the right conductive disk 17 can be fastened to the outer side of the drive disk 162. A contact rod 171 is fixedly installed at the end of the right conductive disk 17, facing the annular groove on the left conductive disk 18. When the contact rod 171 on the right conductive disk 17 abuts against the conductive arc block 181, the right conductive disk 17 can be electrically connected to the left conductive disk 18 via the contact rod 171 and the conductive arc block 181. Similarly, when the contact rod 171 disengages from the conductive arc block 181, the contact rod 171 is located in the annular groove at the end of the left conductive disk 18, and the contact rod 171 disengages from the conductive arc block 181 and the left conductive disk 18, thus breaking the electrical connection between the right conductive disk 17 and the left conductive disk 18. Figure 6 It is evident that conductive brushes 19 are fixedly installed on the side of the frame 1. The two conductive brushes 19 are respectively attached to the outer sides of the right conductive disk 17 and the left conductive disk 18. The conductive brushes 19 are electrically connected to the control unit 2 by the wires on them, so that after the contact rod 171 and the conductive arc block 181 come into contact, a complete electrical circuit can be formed. The path is: control unit 2 - wire - first conductive brush 19 - right conductive disk 17 - contact rod 171 - conductive arc block 181 - left conductive disk 18 - second conductive brush 19 - wire - control unit 2.

[0045] In practical applications, the specific processing flow of this fourth embodiment is as follows: Installation and adjustment of safety wire rope 8: During the initial installation, the operator first turns the traction wire rope 9 around the traction wheel 10 and fixes one end to the loading platform 3; then, turns the safety wire rope 8 around the safety wheel frame 11 and fixes the other end to the loading platform 3, and pulls the safety wire rope 8 and traction wire rope 9 relatively tight so that both are in the initial tension state.

[0046] After installation, the operator manually controls the electrical control unit 2 to input an upward signal to the lifting motor 4. The lifting motor 4, after being reduced in speed and torque by the reduction gearbox 5, synchronously drives the drive drum 7 and the safety drum 6 to rotate, respectively winding up the traction wire rope 9 and the safety wire rope 8. The winding of the traction wire rope 9 pulls the loading platform 3 upwards along the column until the loading platform 3 reaches its top limit position. At this point, the upward movement of the loading platform 3 is constrained by the top structure and cannot continue, while the lifting motor 4 continues to drive the safety drum 6 and the drive drum 7 to wind up the traction wire rope 9 through the reduction gearbox 5. Because the loading platform 3 is constrained by the top, the winding resistance of the drive drum 7 to the traction wire rope 9 increases sharply. When this resistance torque overcomes the maximum static friction between the friction plate 164 and the driven disc 161 in the torque limiting component 16, relative sliding occurs between the friction plate 164 and the driven disc 161, and the torque limiting component 16 automatically cuts off the power transmission between the safety drum 6 and the drive drum 7.

[0047] After the power transmission is cut off, the reduction gearbox 5 continues to drive the safety protection drum 6 to rotate, further winding the safety wire rope 8. After winding, the tension of the safety wire rope 8 increases, pushing the buffer piston rod 121 downwards via the safety wheel frame 11 until it reaches the trigger position of the position detection switch 13. It is important to note that the winding speed of the safety wire rope 8 should be relatively slow during this process to avoid excessive compression of the air in the buffer cylinder 12 by the buffer piston rod 121. If the compression is too fast, the air will not have enough time to slowly escape through the damping hole 123, creating a large throttling resistance at the damping hole 123, which will hinder the downward movement of the buffer piston rod 121 and prevent it from accurately reaching the trigger position of the position detection switch 13.

[0048] When the buffer piston rod 121 descends and moves to the trigger position of the position detection switch 13, the position detection switch 13 is triggered and sends an on signal to the electronic control unit 2. After receiving the signal, the electronic control unit 2 determines that the buffer piston rod 121 has moved to the position of the position detection switch 13, that is, the safety wheel frame 11 has tightened the safety wire rope 8 to the correct position.

[0049] Finally, the operator manually adjusts the right conductive plate 17 so that the contact rod 171 on the right conductive plate 17 is attached to the left end of the conductive arc block 181, i.e. Figure 7As shown in the figure, the right conductive disk 17 is tightened and fixed to the drive disk 162 using the locking bolt 172.

[0050] Finally, after the position detection switch 13 is turned on and the right conductive disk 17 and the left conductive disk 18 are turned on, the electronic control unit 2 receives the two electrical signals simultaneously and determines that the entire device has been adjusted and can operate normally.

[0051] The cargo stacking and transportation process is the same as described in Example 1, and will not be repeated here.

[0052] Overload protection process: When the forks on the loading platform 3 lift the goods at the receiving end, if the weight of the goods exceeds the design threshold, as described in Embodiment 3, the drive disc 162 drives the contact rod 171 to rotate relative to each other, triggering the torque limiting component 16 to cut off the power transmission between the safety protection rope drum 6 and the drive rope drum 7. At the same time, the safety protection rope drum 6 continues to wind up the safety wire rope 8, increasing the tension of the safety wire rope 8, pushing the safety wheel frame 11 downward and compressing the spring in the buffer cylinder 12. The buffer piston rod 121 further descends and moves away from the position detection switch 13. When the buffer piston rod 121 is completely disengaged from the position detection switch 13, the position detection switch 13 stops inputting signals to the electronic control unit 2.

[0053] After the electronic control unit 2 does not receive a signal from the positioning detection switch 13, it determines that the buffer piston rod 121 has deviated from its initial normal position, thus inferring that the device may be experiencing overload transport or fatigue elongation of the traction steel wire rope 9. Subsequently, as described in Embodiment 3, the electronic control unit 2 sends a stop signal to the hoisting motor 4 and drives the alarm component to issue an alarm. The alarm and stop process caused by fatigue elongation of the traction steel wire rope 9 has been described in detail in Embodiment 2 and will not be repeated here.

[0054] Reset process of the device: After the operator checks that the device alarm has occurred, the forks must first be retracted into the loading platform 3. Then, the electronic control unit 2 inputs a downward signal to the lifting motor 4. The lifting motor 4 drives the safety protection drum 6 and the drive drum 7 to reverse and unwind via the reduction gearbox 5. The loading platform 3 descends along the column until it reaches the bottom limit position. At this time, the one-way toothed row 15 on the loading platform 3 presses against the one-way gear 14, thereby limiting the drive drum 7 from continuing to unwind.

[0055] Because the one-way gear rack 15 locks the one-way gear 14, the drive drum 7 is locked and cannot rotate. The driven disc 161 in the torque limiting assembly 16 cannot rotate synchronously with the drive disc 162, and power transmission is cut off. The safety drum 6 continues to unwind, and the safety wire rope 8 is gradually released, reducing the downward tension of the safety wire rope 8 on the safety wheel frame 11. At this time, the spring in the buffer cylinder 12 releases its elastic force, pushing the buffer piston rod 121 upward until the buffer piston rod 121 re-contacts the position detection switch 13. The position detection switch 13 is triggered again and inputs an on signal to the electronic control unit 2, which determines that the buffer piston rod 121 has moved upward and reset to its initial position.

[0056] More specifically, such as Figure 5 and Figure 6 As shown: Counterclockwise rotation of the safety protection drum 6 and the drive drum 7 represents winding, and clockwise rotation represents unwinding. When the loading platform 3 is overloaded, the reduction gearbox 5 drives the safety protection drum 6 and the drive drum 7 to wind counterclockwise, and the drive disc 162 drives the right conductive disc 17 and the contact rod 171 to rotate counterclockwise. The contact rod 171 and the conductive arc block 181 move away from each other, and the circuit is broken. During reset, the reduction gearbox 5 drives the safety protection drum 6 and the drive drum 7 to unwind clockwise. Because the drive drum 7 is restricted by the locking of the one-way gear row 15 and the one-way gear 14, it cannot rotate, forcing the drive disc 162 to drive the right conductive disc 17 and the contact rod 171 to rotate clockwise to reset, until the contact rod 171 moves again to the left end of the conductive arc block 181. At this time, the position detection switch 13 inputs an electrical signal to the electronic control unit 2, and the contact rod 171 and the conductive arc block 181 reconnect to form a circuit, also inputting an electrical signal to the electronic control unit 2. The electronic control unit 2 can determine that the device has been reset to normal working state and allow the equipment to restart only after receiving the above two signals at the same time.

[0057] It should be noted that, due to the certain length of the conductive arc block 181, when the right conductive disk 17 drives the contact rod 171 to reset, the contact rod 171 can slide on the conductive arc block 181 within a certain angle range and still maintain electrical connection. The purpose of this design is that the wire rope will experience fatigue elongation during repeated winding and unwinding operations, but it will still meet the usage requirements within its rated fatigue elongation range and will not need to be replaced; when the fatigue elongation exceeds the preset threshold, the load-bearing capacity of the wire rope will decrease significantly, posing a risk of rope breakage, at which point it must be replaced. Therefore, the length of the conductive arc block 181 limits the maximum allowable relative winding amount between the safety protection rope drum 6 and the drive rope drum 7, and this allowable winding amount is set to be less than the maximum allowable value of fatigue elongation of the traction wire rope 9.

[0058] More specifically, when the traction steel wire rope 9 causes the loading platform 3 to descend due to fatigue elongation, and the traction safety steel wire rope 8 becomes further tensioned, the safety wheel frame 11 pushes the buffer piston rod 121 downward and disengages from the positioning detection switch 13, at which point the positioning detection switch 13 stops outputting a signal. At this time, the electric contact rod 171 is still attached to the conductive arc block 181, the circuit is still connected, and the electronic control unit 2 only receives a single signal, which is determined to be general fatigue elongation, triggering a shutdown alarm.

[0059] After the operator lowers the loading platform 3 to the bottom and resets it according to the above steps, the safety protection rope drum 6 unwinds, causing the drive disc 162 to rotate clockwise. The right conductive disc 17 causes the contact rod 171 to slide to the right on the conductive arc block 181. If the fatigue elongation of the traction steel wire rope 9 is within the allowable range, and the contact rod 171 is still within the range of the conductive arc block 181, the spring pushes the buffer piston rod 121 upward to contact the detection switch 13. At the same time, the dual signals are restored, and the electrical control unit 2 determines that the device reset is normal.

[0060] Conversely, if the fatigue elongation of the traction wire rope 9 is too large, during the unwinding process of the safety protection drum 6, the clockwise rotating drive disc 162 drives the right conductive disc 17 and the contact rod 171 to continue rotating clockwise until the contact rod 171 slides out of the right end of the conductive arc block 181, and the two are no longer electrically connected. At this time, the end of the contact rod 171 is located in the annular groove on the end face of the driven disc 161 on the right side of the conductive arc block 181, and is no longer conductive. Subsequently, the safety wire rope 8 is released, the tension decreases, the spring pushes the buffer piston rod 121 upward and contacts the position detection switch 13, and the position detection switch 13 inputs a signal to the electronic control unit 2. However, since the contact rod 171 has disengaged from the conductive arc block 181, the electronic control unit 2 only receives a single signal, and determines that the fatigue elongation of the traction wire rope 9 has seriously exceeded the allowable range and is close to the limit extension length, and must be replaced immediately. The electronic control unit 2 then inputs a signal to the alarm component again, issues an alarm and warns the operator that the traction wire rope 9 must be replaced.

[0061] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cargo stacking device for logistics warehousing, characterized in that, include: The frame (1) has a loading platform (3) installed on the inside and an electrical control unit (2) installed on the side. The lifting motor (4) is fixed on one side of the frame (1). The output shaft of the lifting motor (4) is equipped with a reduction gearbox (5), and the output end of the reduction gearbox (5) is equipped with a safety protection rope drum (6). The shaft of the safety protection rope drum (6) is equipped with a drive rope drum (7). The traction steel wire rope (9) is fixed at one end to the drive rope drum (7), and its side is reversed by the traction wheel (10) installed on the top of the frame (1). The other end is fixed on the loading platform (3). Safety wheel frame (11) is movably installed on the top of frame (1), and buffer cylinder (12) is installed on the side of frame (1). Buffer piston rod (121) is fixedly connected to the bottom of safety wheel frame (11) inside buffer cylinder (12). Spring is fixedly connected between the bottom end of buffer piston rod (121) and the bottom of the inner side of buffer cylinder (12). The safety wire rope (8) is fixed at one end to the safety protection rope drum (6), and is reversed in the middle by the safety wheel frame (11). The other end is fixed on the loading platform (3). Under normal conditions, the traction steel wire rope (9) applies traction force to the loading platform (3), driving the loading platform (3) to move up and down along the frame (1); the buffer piston rod (121) is pushed by the spring force and keeps the safety steel wire rope (8) in a taut state through the safety wheel frame (11); When the traction steel wire rope (9) breaks, the weight of the loading platform (3) and the load act on the safety steel wire rope (8). The safety steel wire rope (8) pushes the buffer piston rod (121) downward through the safety wheel frame (11) and compresses the spring in the buffer cylinder (12). The elastic deformation of the spring is used to buffer and decelerate the fall of the loading platform (3). At the same time, the safety steel wire rope (8) forms a reverse traction on the loading platform (3) to prevent the loading platform (3) and the goods from falling.

2. The cargo stacking device for logistics warehousing according to claim 1, characterized in that, The diameter of the safety wire rope (8) is greater than the diameter of the traction wire rope (9).

3. The cargo stacking device for logistics warehousing according to claim 1, characterized in that, A one-way air intake valve (122) is fixedly installed at the bottom of the buffer cylinder (12). The one-way air intake valve (122) enables external air to flow into the inner cavity of the buffer cylinder (12) in one direction. A damping hole (123) is opened at the bottom of the buffer cylinder (12).

4. The cargo stacking device for logistics warehousing according to claim 3, characterized in that, A position detection switch (13) is fixedly installed on the outside of the buffer cylinder (12), and the position detection switch (13) is electrically connected to the electrical control unit (2).

5. The cargo stacking device for logistics warehousing according to claim 1, characterized in that, The first connection method between the safety protection drum (6) and the drive drum (7) is that the two are coaxially fixedly connected.

6. The cargo stacking device for logistics warehousing according to claim 4, characterized in that, In the second connection method between the safety protection drum (6) and the drive drum (7), a torque limiting component (16) is connected between the shafts of the safety protection drum (6) and the drive drum (7). The torque limiting component (16) can cut off the power transmission when the load exceeds the preset safe torque value.

7. The cargo stacking device for logistics warehousing according to claim 6, characterized in that, The torque limiting component (16) is mainly composed of a driven disc (161), a drive disc (162), an intermediate ring (163), a friction plate (164), and an elastic component. The driven disc (161) is fixedly connected to the shaft of the drive rope drum (7), and the drive disc (162) is fixedly connected to the shaft of the safety protection rope drum (6). An intermediate ring (163) is movably installed on the inner side of the end of the drive disc (162). A friction plate (164) is fixedly installed on one end of the intermediate ring (163). An elastic component is fixedly installed on the end of the drive disc (162), and the elastic component abuts against the intermediate ring (163).

8. The cargo stacking device for logistics warehousing according to claim 7, characterized in that, A one-way gear rack (15) is fixedly installed on the side of the loading platform (3). A one-way gear (14) corresponding to the one-way gear rack (15) is fixedly installed on the end of the drive rope drum (7). After the one-way gear rack (15) presses down on the one-way gear (14), it restricts the one-way gear (14) from rotating in one direction.

9. The cargo stacking device for logistics warehousing according to claim 8, characterized in that, A left conductive disk (18) is fixedly installed on the outer side of the driven disk (161), and an annular groove is provided at the end of the left conductive disk (18) facing the drive disk (162), and a conductive arc block (181) is fixedly installed in the annular groove. A right conductive disk (17) is installed on the outer side of the drive disk (162), and a locking bolt (172) is threaded on the side of the right conductive disk (17). A contact rod (171) is fixedly installed at the end of the right conductive disk (17) facing the upper annular groove of the left conductive disk (18). A conductive brush (19) is fixedly installed on the side of the frame (1). The conductive brush (19) is attached to the outer side of the right conductive disk (17) and the left conductive disk (18). The wire on the conductive brush (19) is electrically connected to the control unit (2). After the contact rod (171) and the conductive arc block (181) come into contact, an electrical circuit is formed consisting of the control unit (2) - wire - first conductive brush - right conductive disk (17) - contact rod (171) - conductive arc block (181) - left conductive disk (18) - second conductive brush - wire - control unit (2).

10. A method for stacking goods for logistics warehousing, using the goods stacking device for logistics warehousing as described in claim 1, characterized in that, Includes the following steps: S1. After the traction steel wire rope (9) is wrapped around the traction wheel (10), one end is fixedly connected to the loading platform (3) so that the traction steel wire rope (9) is in a tensioned state; after the safety steel wire rope (8) is wrapped around the safety wheel frame (11), one end is fixedly connected to the loading platform (3) and the safety wheel frame (11) is moved down through the buffer piston rod (121) to apply pre-compression to the spring in the buffer cylinder (12) so that the spring is in an energy storage state; S2. The goods are carried by the forks on the loading platform (3), and the horizontal transfer of the loading platform (3) is achieved by the traveling wheels at the bottom of the frame (1) along the track; the electrical control unit (2) controls the lifting motor (4) to drive the drive rope drum (7) to wind up the traction steel wire rope (9) through the reduction gearbox (5), and at the same time drives the safety protection rope drum (6) to wind up the safety steel wire rope (8), and pulls the loading platform (3) up along the column to the target floor height to complete the goods entering the warehouse; when leaving the warehouse, the reverse operation of the above process is performed; S3. When the traction steel wire rope (9) breaks during the traction of the loading platform (3), the loading platform (3) falls under its own weight and the weight of the cargo and pulls the safety steel wire rope (8) down synchronously. The safety steel wire rope (8) drives the safety wheel frame (11) down and pushes the buffer piston rod (121) to compress the spring in the buffer cylinder (12) a second time. The elastic force of the spring is used to buffer and decelerate the fall of the loading platform (3) to prevent the safety steel wire rope (8) from breaking due to excessive instantaneous impact tension.

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