An automatic retractable system for a sling cable

Abstract

The present invention discloses an automatic retracting and releasing system for a sling cable, which relates to the technical field of lifting machinery, and includes a frame; a reel, which is rotatably arranged on the frame; a cable, the first end of the cable is connected to the reel, the reel can reel and convey the cable, and the second end of the cable is connected to a plug; a limiting component, the limiting component includes a bracket, a tension slider and an elastic member, the bracket is fixed to the end of the frame, and the tension slider can be slidably arranged on the bracket along the length direction of the cable; the elastic member is arranged between the bracket and the tension slider, and the elastic member provides a force for the tension slider to move away from the reel; the tension slider is provided with an avoidance opening, and the cable passes through the avoidance opening, and a limiting block is radially protruded at the second end of the cable, and the limiting block is suitable for abutting against the side of the tension slider away from the reel. The present invention facilitates the realization of the limit plug and cable when the plug is detached from the sling, and avoids the plug and cable from shaking back and forth.

Description

Technical Field

[0001] The present invention relates to the technical field of lifting machinery, and particularly relates to an automatic retracting and extending system for a sling cable. Background Art

[0002] Lifting devices are widely used in construction sites, port logistics and other fields. In lifting devices, steel cables are usually used to transmit power, and a winch driven by an electric motor drives the steel cable to move. The steel cable is connected to a sling, thereby driving the sling to lift and drive the goods to lift.

[0003] In current lifting devices, the sling needs to be electrically connected to the lifting device through a cable. Among them, the cable is retracted and extended through a reel. The reel and the cable are arranged on the frame of the lifting device, and the connection between the cable and the sling is realized through the cooperation of a plug and a socket. When the steel cable drives the sling to lift, the reel also drives the cable to lift synchronously to prevent the cable from detaching from the sling. When the sling is not used for lifting operations, the operator needs to unplug the plug, and the reel drives the cable and the plug to rise to the frame.

[0004] In traditional lifting devices, when the sling is not in use, if the plug and the cable are not limited, the plug and the cable suspended in the air are prone to swing back and forth, causing cable wear and plug bumps. Therefore, the operator needs to climb to a high place to fix the plug on the frame, which is dangerous and difficult to operate, and there are inconveniences. Summary of the Invention

[0005] The purpose of the present invention is to provide an automatic retracting and extending system for a sling cable, which can conveniently retract and limit the plug and the cable when the plug is separated from the sling and be in a safe state as required, and avoid the disorderly swing of the plug and the cable.

[0006] The above technical purpose of the present invention is achieved through the following technical solutions:

[0007] The present invention provides an automatic retracting and extending system for a sling cable, and the automatic retracting and extending system includes:

[0008] A frame;

[0009] A reel, which is rotatably arranged on the frame;

[0010] A cable, the first end of the cable is connected to the reel, the reel can wind and convey the cable, and the second end of the cable is connected with a plug;

[0011] A limiting assembly, the limiting assembly includes a bracket, a tension slider and an elastic member. The bracket is fixed at the end of the frame, and the tension slider is slidably arranged on the bracket along the length direction of the cable; the elastic member is arranged between the bracket and the tension slider, and the elastic member provides a force for the tension slider in a direction away from the reel;

[0012] The tension slider is provided with an avoidance opening through which the cable passes. A limiting block protrudes radially from the second end of the cable, and the limiting block is adapted to abut against the side of the tension slider away from the reel.

[0013] In this solution, the frame of the automatic rewinding system is arranged at a high position, and the first end of the cable is connected to the reel. Thus, the cable is wound and conveyed through the reel. The second end of the cable passes through the limiting component to the end of the frame and then extends downward, and can be connected to the lifting appliance through a plug. Thus, when the steel cable drives the lifting appliance to lift and lower, the reel can drive the cable to lift and move to adapt to the lifting appliance. When the cable is not connected to the lifting appliance, the reel can drive the cable to rise to the frame. The cable slides relative to the avoidance opening of the tension slider until the limiting block at the second end of the cable abuts against the tension slider. At this time, the cable will drive the tension slider to move towards the direction close to the reel. The acting force of the elastic member acts on the tension slider. At this time, stop the reel, and the cable is kept taut under the action of the tension slider, so that the plug at the second end of the cable is relatively fixed at the tension slider. Thus, the cable and the plug are not easy to shake in the air, causing cable wear or plug collision. Therefore, there is no need for manual climbing to a high place to fix the cable and the plug, reducing the operation difficulty and danger.

[0014] Further, the limiting component further includes a microswitch and a controller. The microswitch is connected to the bracket, and the microswitch is located on the moving path of the tension slider and is spaced from the tension slider; the controller is connected to the microswitch and the reel, and the controller controls the reel to stop winding the cable when the microswitch is triggered.

[0015] In this solution, the microswitch is located on the moving path of the tension slider. The limiting block of the cable abuts against the tension slider and drives the tension slider to move against the elastic force of the elastic member. When the tension slider moves to trigger the microswitch, the reel stops winding the cable, avoiding tearing the cable. Thus, there is no need for manual control of the start and stop of the reel, which is convenient for the user to operate.

[0016] Further, a guide rod is fixedly arranged on the bracket. The guide rod extends along the direction away from the reel. A guide hole is formed in the tension slider, and the guide rod is slidably fitted in the guide hole.

[0017] In this solution, the tension slider is guided by the cooperation of the guide hole and the guide rod, making the cable drive the tension slider to slide more stably and smoothly.

[0018] Further, the elastic member includes a compression spring. A spring seat is connected to the bracket, and the spring seat is connected to the guide rod. The spring seat is disposed on one side of the tension slider facing the reel. The compression spring is sleeved outside the guide rod, and opposite ends of the compression spring respectively abut against the spring seat and the tension slider.

[0019] In this solution, the elastic member uses a compression spring, and the compression spring is sleeved outside the guide rod, so that the guide rod can also guide the compression spring. Opposite ends of the compression spring respectively abut against the spring seat and the tension slider, enabling the compression spring to expand and contract along the sliding direction of the tension slider, and the elastic force of the compression spring can stably act on the tension slider.

[0020] Further, a first guide wheel is rotatably connected to the bracket, and the first guide wheel rotates in a vertical plane; the cable is wound around the circumference of the first guide wheel in a fitting manner, and the tension slider is disposed on the circumference of the first guide wheel.

[0021] In this solution, the first guide wheel is rotatably provided on the bracket, and the cable is attached to the circumference of the first guide wheel. When the cable moves, the first guide wheel rotates to guide the cable, enabling the cable at the end of the frame to smoothly convert from vertical movement to movement parallel to the frame; the tension slider is disposed on the circumference of the first guide wheel so that the cable contacts the tension slider when moving along the first guide wheel.

[0022] Further, the guide rod is disposed on the circumference of the first guide wheel and forms a gap with the first guide wheel. The guide rod is bent into an arc shape, and the center of curvature of the guide rod coincides with the center of the first guide wheel.

[0023] In this solution, a gap is formed between the guide rod and the first guide wheel to facilitate the sliding of the tension slider on the outer circumference of the first guide wheel; the guide rod is in an arc shape that coincides with the center of the first guide wheel, and the movement path of the tension slider is parallel to the movement path of the cable on the first guide wheel. Furthermore, when the tension slider moves driven by the cable, it remains relatively stationary with respect to the cable, enabling the tension of the cable to stably act on the elastic member through the tension slider.

[0024] Further, a front limit plate is connected to the bracket. The front limit plate is disposed opposite to the spring seat. One end of the guide rod away from the spring seat is connected to the front limit plate, and the tension slider is limited between the spring seat and the front limit plate.

[0025] In this solution, the front limit plate is disposed opposite to the spring seat, and the guide rod is connected between the spring seat and the front limit plate, facilitating the installation of the front guide rod on the bracket; at the same time, the front limit plate and the spring seat limit the tension slider and the elastic member, preventing the tension slider and the elastic member from detaching from the bracket.

[0026] Further, the bracket is rotatably connected with a second guide wheel, and the second guide wheel is arranged on the circumferential side of the first guide wheel; a guide groove is formed on the circumferential side of the second guide wheel, and the cable passes through the guide groove.

[0027] In this solution, the second guide wheel and the first guide wheel cooperate to guide and limit the cable, so that the cable is limited outside the circumferential side of the first guide wheel and located in the guide groove, thereby making the cable move stably and smoothly and not easily break away from the limiting component.

[0028] Further, the microswitch includes a switch body and a switch wheel arm, the switch body is fixed to the bracket, and the switch wheel arm extends to the moving path of the tension slider.

[0029] In this solution, a feasible way of the microswitch is disclosed. The microswitch has two states: closed and open. The switch wheel arm extends to the moving path of the tension slider, and the tension slider can touch the switch wheel arm, so as to trigger the microswitch by changing the position of the switch wheel arm.

[0030] Further, the automatic rewinding system further includes an anti-off groove component, the anti-off groove component includes a guide frame, two first rollers arranged at intervals and two second rollers arranged at intervals. The guide frame is arranged on the frame and located between the reel and the limiting component. The first roller and the second roller are rotatably connected to the guide frame. The second roller is arranged perpendicular to the first roller, and a guiding space for the cable to pass through is formed by enclosing between the first roller and the second roller.

[0031] In this solution, an anti-off groove component is arranged on the bracket. The anti-off groove component is arranged between the reel and the limiting component. The anti-off groove component forms a guiding space by enclosing two groups of first rollers and second rollers arranged perpendicular to each other. The cable passes through the guiding space to guide the cable between the reel and the limiting component, so that the cable is not easily offset and shaken during movement, and the first roller and the second roller can roll to reduce the friction when the cable moves.

[0032] In summary, the present invention has the following beneficial effects:

[0033] In the automatic retracting and deploying system of the present invention, the cable is wound and conveyed through a reel. When the cable is not connected to the spreader, the reel can drive the cable to rise to the rack. The cable slides relative to the avoidance opening of the tension slider until the limit block at the second end of the cable abuts against the tension slider. At this time, the cable will drive the tension slider to move towards the direction close to the reel. The acting force of the elastic member acts on the tension slider. At this time, the reel is stopped, and the cable is kept taut under the action of the tension slider, so that the plug at the second end of the cable is relatively fixed at the tension slider. Therefore, the cable and the plug are not likely to shake in the air, causing cable wear or plug collision, and there is no need for manual climbing to a high place to fix the cable and the plug, reducing the operation difficulty and danger. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic structural diagram of a spreader and an automatic retracting and deploying system according to an embodiment of the present invention.

[0035] Figure 2 is a schematic three-dimensional structural diagram of an automatic retracting and deploying system according to an embodiment of the present invention.

[0036] Figure 3 is a schematic three-dimensional structural diagram of an anti-disengagement groove assembly according to an embodiment of the present invention.

[0037] Figure 4 is a schematic vertical sectional structural diagram of a first roller according to an embodiment of the present invention.

[0038] Figure 5 is a schematic vertical sectional structural diagram of a second roller section according to an embodiment of the present invention.

[0039] Figure 6 is a schematic exploded structural diagram of a supporting roller according to an embodiment of the present invention.

[0040] Figure 7 is a schematic three-dimensional structural diagram of a limit assembly and a cable according to an embodiment of the present invention.

[0041] Figure 8 is a schematic three-dimensional structural diagram of a limit assembly according to an embodiment of the present invention.

[0042] Figure 9 is a schematic front view structural diagram of a limit assembly according to an embodiment of the present invention.

[0043] Figure 10 is a schematic three-dimensional structural diagram of a microswitch according to an embodiment of the present invention.

[0044] In the figure:

[0045] 1000. Automatic retracting and extending system; 100. Frame; 110. Fork; 200. Reel; 300. Cable; 310. Limit block; 400. Limit component; 410. Bracket; 411. Left support plate; 412. Right support plate; 413. Pulley shaft; 420. Tension slider; 421. Avoidance opening; 422. Guide hole; 430. Elastic member; 440. Guide rod; 450. Spring seat; 460. Front limit plate; 470. First guide wheel; 471. Flange; 480. Second guide wheel; 481. Guide groove; 490. Microswitch; 491. Switch body; 492. Switch wheel arm; 500. Plug; 600. Anti - detachment groove component; 610. Guide frame; 620. First roller; 621. Idler roller; 6211. Rotation hole; 6212. First roller section; 6213. Second roller section; 6214. Connecting block; 6215. Connecting groove; 6216. Locking ring groove; 6217. Locking protrusion; 6218. Avoidance groove; 622. Support shaft; 630. Second roller; 640. Guide space; 2000. Spread. Detailed implementation mode

[0046] The present invention will be further described below with reference to the accompanying drawings.

[0047] This embodiment discloses an automatic retracting and extending system 1000 for the spread cable, which is arranged on the hoisting device. Refer to Figure 1 , the automatic retracting and extending system 1000 includes a frame 100, a reel 200, a cable 300 and a limit component 400, and the reel 200, the cable 300 and the limit component 400 are arranged on the frame 100. Among them, the hoisting device can be a hoisting machine in various construction sites, port logistics or other application scenarios, such as a gantry crane applied to a port, a traveling crane applied to a factory or a port, a crane applied to a construction site, and so on.

[0048] Refer to Figure 1 and Figure 2 , the first end of the frame 100 is fixed at a high position of the hoisting device, and the second end of the frame 100 extends above the goods to be hoisted. In this embodiment, the second end of the frame 100 is provided with two forks 110 in a Y - shape, and cable guide wheels are rotatably arranged on the two forks 110. The cable of the hoisting device is led out from the winch, passes through the frame 100 and then extends downward from the cable guide wheels at the second end of the frame 100 to be connected to the spread 2000. A notch is formed between the two forks 110, and the limit component 400 is installed in this notch. In addition, in other embodiments, the frame 100 can also be of other suitable shapes.

[0049] In this embodiment, the reel 200 is rotatably arranged above the frame 100, and the reel 200 is at a certain distance from the second end of the frame 100 to reduce the weight of the lifting end of the lifting device, so that the lifting device has a reasonable counterweight. A motor is arranged inside the reel 200. The first end of the cable 300 is wound around the reel 200, and the second end of the cable 300 passes through the frame 100 and extends from the limiting component 400 to below the frame 100 to connect the spreader 2000. The reel 200 can rotate under the drive of the motor to wind and convey the cable 300.

[0050] Referring to Figure 1 and Figure 2 , in this embodiment, a plug 500 is connected to the second end of the cable 300. When the lifting device operates, the second end of the cable 300 extends downward from the second end of the frame 100 to the spreader 2000, and the plug 500 cooperates with the socket on the spreader 2000 to realize the connection between the cable 300 and the spreader 2000.

[0051] Referring to Figures 1 to 3 , a cable anti - detachment groove component 600 is arranged on the frame 100. The cable anti - detachment groove component 600 is arranged between the reel 200 and the limiting component 400 and is used to guide the cable 300 between the reel 200 and the limiting component 400 to prevent the cable 300 from detaching from the frame 100.

[0052] Specifically, the cable anti - detachment groove component 600 includes a guide frame 610, a first roller 620, and a second roller 630. The guide frame 610 is fixedly arranged above the frame 100 and is located between the reel 200 and the limiting component 400. The first roller 620 and the second roller 630 are rotatably connected to the guide frame 610. Among them, two first rollers 620 are arranged in parallel at intervals, and two second rollers 630 are arranged in parallel at intervals. The second roller 630 is arranged perpendicular to the first roller 620, and the two second rollers 630 are respectively located at both ends of the two first rollers 620, and the two first rollers 620 are respectively located at both ends of the two second rollers 630, so that a guiding space 640 is enclosed between the first roller 620 and the second roller 630. The cable 300 passes through the guiding space 640. Thus, the cable anti - detachment groove component 600 guides the cable 300 between the reel 200 and the limiting component 400, so that the cable 300 is not easily deflected and shaken during movement, and the first roller 620 and the second roller 630 can roll to reduce the friction when the cable 300 moves.

[0053] In this embodiment, both the first roller 620 and the second roller are made of nylon, so that the first roller 620 and the second roller have good toughness, the impact resistance of the first roller 620 and the second roller is good when the cable 300 swings, and the first roller 620 and the second roller are not easily broken.

[0054] Referring toFigure 3 and Figure 4 In this embodiment, the length of the first roller 620 is greater than that of the second roller, so that the guiding space is in a long rectangular shape. The first roller 620 includes a roller 621 and a support shaft 622. The support shaft 622 is fixedly connected to the guiding frame 610. The roller 621 is axially provided with a rotating hole 6211, and the support shaft 622 is rotatably fitted in the rotating hole 6211.

[0055] Among them, the roller 621 includes at least two roller sections. In this embodiment, it is specifically shown in the way that the roller 621 includes two roller sections. The two roller sections are defined as a first roller section 6212 and a second roller section 6213. The first roller section 6212 is coaxially connected to one end of the second roller section 6213 close to the frame 100. The first roller section 6212 and the second roller section 6213 are detachably connected. When processing the roller 621, the rotating hole 6211 can be processed on the first roller section 6212 and the second roller section 6213 successively, and then the first roller section 6212 and the second roller section 6213 are connected.

[0056] In the related art, a single long roller section is adopted. When processing the rotating hole 6211, in order to meet the processing depth, holes need to be processed from both ends of the roller section respectively, and the holes at both ends are communicated inside the roller section. It is difficult to ensure the concentricity of the processed rotating hole 6211 during this process, and it is easy for the holes processed at both ends to be misaligned at the connection part in the middle of the roller section, so that a step is formed in the rotating hole 6211, which is not convenient for the installation of the support shaft 622, and the support shaft 622 and the roller section are easily worn when the roller 621 rotates relative to the support shaft 622. In this embodiment, the process of processing the rotating hole 6211 in sections can reduce the depth of processing the rotating hole 6211 each time and improve the concentricity of the rotating hole 6211 and the roller 621.

[0057] Referring to Figures 4 to 6 , in this embodiment, a connecting block 6214 protrudes from one end of the first roller section 6212 facing the second roller section 6213, and a connecting groove 6215 is formed at one end of the second roller section 6213 facing the first roller section 6212. The connecting block 6214 is coaxially connected to the first roller section 6212, and the rotating hole 6211 on the first roller section 6212 penetrates through the connecting block 6214, and the connecting groove 6215 is coaxially communicated with the rotating hole 6211 of the second roller section 6213.

[0058] Among them, a locking ring groove 6216 is circumferentially formed on the circumferential side of the connecting block 6214, and the cross section of the locking ring groove 6216 (i.e., the section passing through the central axis of the idler 621) is arc-shaped. A circumferentially extending locking protrusion 6217 is convexly provided on the inner wall of the connecting groove 6215 towards the inner side, and the cross section of the locking protrusion 6217 is arc-shaped and adapted to the locking ring groove 6216. A plurality of relief grooves 6218 are formed in the connecting block 6214, and the relief grooves 6218 extend along the radial and axial directions of the connecting block 6214, so that the plurality of relief grooves 6218 divide the connecting block 6214 into a plurality of small pieces. Thus, when the connecting block 6214 is inserted into the connecting groove 6215, the connecting block 6214 can contract and deform inwardly so that the locking protrusion 6217 can be squeezed into the locking ring groove 6216. After the connecting block 6214 is inserted into the connecting groove 6215, it rebounds, so that the locking protrusion 6217 is stably engaged with the locking ring groove 6216, preventing the connecting block 6214 from disengaging from the connecting groove 6215, thereby realizing the connection between the first roller section 6212 and the second roller section 6213.

[0059] In addition, in other embodiments, the connecting block 6214 may also be provided on the second roller section 6213, and correspondingly, the connecting groove 6215 is provided on the first roller section 6212.

[0060] In other embodiments, the first roller section 6212 and the second roller section 6213 may also be connected in other suitable ways.

[0061] Referring to Figures 2 to 4 , in this embodiment, the first roller 620 is disposed perpendicular to the surface of the frame 100, and the second roller 630 is disposed parallel to the surface of the frame 100. In addition, in other embodiments, the first roller 620 and the second roller 630 may also be inclined with respect to the frame 100.

[0062] In this embodiment, a plurality of anti-disengagement groove assemblies 600 are provided, and the plurality of anti-disengagement groove assemblies 600 are uniformly spaced between the reel 200 and the limiting assembly 400 and are located on the same straight line, so that the cable 300 between the reel 200 and the limiting assembly 400 moves in a straight line and is not prone to bending and offset. At the same time, when the cable 300 between the limiting assembly 400 and the reel 200 moves relative to the anti-disengagement groove assembly 600 for winding and unwinding, the tension in each direction of the cable 300 decays orderly, reducing the influence when the cable 300 shakes.

[0063] In the direction from the limit assembly 400 to the reel 200, the height of the plurality of anti-slip groove assemblies 600 gradually increases, that is, the height of the first rollers 620 in the plurality of anti-slip groove assemblies 600 gradually increases, so that the height of the guide space 640 gradually increases. This arrangement enables the cable 300 from the limit assembly 400 to the reel 200 to pass through each guide space 640 when it is not parallel to the frame 100, and thus the reel 200 can be set to different heights on the frame 100, without making the cable 300 drawn out of the reel 200 parallel to the cable 300 at the limit assembly 400 to the frame 100, thereby reducing the limitations of the installation of the reel 200.

[0064] Reference Figure 2 and Figure 7 The limit assembly 400 includes a bracket 410, a tension slider 420 and an elastic member 430. The bracket 410 is fixed to the notch of the second end of the frame 100, and the tension slider 420 is slidably disposed on the bracket 410. The sliding direction of the tension slider 420 is parallel to the length direction of the cable 300. The elastic member 430 is disposed between the bracket 410 and the tension slider 420, and the elastic member 430 provides a force for the tension slider 420 to move away from the reel 200.

[0065] The tension slider 420 is provided with an escape opening 421, and the cable 300 passes through the escape opening 421. A stopper 310 is radially protruded from the second end of the cable 300. In this embodiment, the stopper 310 is cylindrical, the escape opening 421 is rectangular, and the diameter of the stopper 310 is greater than the width of the escape opening 421, so that the stopper 310 can abut against the side of the tension slider 420 away from the reel 200. In addition, in other embodiments, the stopper 310 and the escape opening 421 can also be other suitable shapes, as long as the stopper 310 cannot pass through the escape opening 421.

[0066] In other embodiments, the limiting block 310 may also be connected to the plug 500 , and the limiting block 310 may also be a part of the plug 500 .

[0067] In this embodiment, when the lifting device stops the lifting operation, unplug the plug 500 to separate the cable 300 from the spreader 2000. The cable reel 200 can drive the cable 300 to rise to the frame 100. The cable 300 slides relative to the avoidance opening 421 of the tension slider 420 until the limit block 310 at the second end of the cable 300 abuts against the tension slider 420. At this time, the cable 300 will drive the tension slider 420 to move towards the direction close to the cable reel 200, and the acting force of the elastic member 430 acts on the tension slider. Then stop the cable reel 200. The cable 300 is kept taut under the action of the tension slider, so that the plug 500 at the second end of the cable 300 is relatively fixed at the tension slider. Thus, the cable 300 and the plug 500 are not likely to shake in the air, causing wear of the cable 300 or knocking of the plug 500, and there is no need for manual climbing to a high place to fix the cable 300 and the plug 500, reducing the operation difficulty and danger.

[0068] When the lifting operation is required, start the cable reel 200 to start conveying the cable 300. Under the elastic force of the elastic member 430, the tension slider drives the limit block 310 to move away from the cable reel 200, so that the cable 300 can be ejected below the second end of the frame 100. Subsequently, the gravity of the cable 300 and the plug 500 can pull the cable 300 down to the spreader 2000, and the situation where the cable 300 and the plug 500 are located above the frame 100 and cannot fall will not occur.

[0069] Refer to Figures 7 to 9 , a guide rod 440 is fixedly arranged on the bracket 410. The guide rod 440 extends along the direction away from the cable reel 200 and is parallel to the cable 300. A guide hole 422 is formed on the tension slider 420, and the guide rod 440 is slidably fitted in the guide hole 422. The tension slider 420 is guided by the cooperation of the guide hole 422 and the guide rod 440, so that when the cable 300 drives the tension slider 420 to slide, it is more stable and smooth.

[0070] Wherein, at least two guide rods 440 are arranged in parallel, and correspondingly, at least two guide holes 422 are arranged on the tension slider. The guide holes 422 are respectively and correspondingly fitted with the guide rods 440. Thus, the tension slider is not likely to rotate when sliding.

[0071] In addition, in other embodiments, other suitable ways such as a slide rail and slider can also be used to guide the tension slider 420.

[0072] In this embodiment, the elastic member 430 includes a compression spring, a spring seat 450 is connected to the bracket 410, each guide rod 440 is connected to a spring seat 450, and the spring seat 450 is arranged on the side of the tension slider 420 facing the reel 200. The number of compression springs is the same as that of the guide rods 440, and the compression springs are sleeved outside the guide rods 440 in a one-to-one correspondence, and the opposite ends of the compression springs are respectively abutted against the spring seat 450 and the tension slider 420. Therefore, the guide rod 440 can guide the compression spring, and the compression spring is telescopically deformed along the sliding direction of the tension slider 420, and the elastic force of the compression spring can stably act on the tension slider 420.

[0073] In addition, in other embodiments, other suitable elastic members 430 may also be selected. For example, in one embodiment, the elastic member 430 may be a tension spring, and the corresponding spring seat 450 is disposed on the side of the tension slider 420 away from the reel 200, and the two ends of the tension spring are fixedly connected to the tension slider 420 and the spring seat 450. Alternatively, in one embodiment, the elastic member 430 may also be an elastic rope, and the spring seat 450 is disposed on the side of the tension slider 420 away from the reel 200, and the two ends of the elastic rope are respectively fixedly connected to the tension slider 420 and the spring seat 450.

[0074] In this embodiment, a front limit plate 460 is connected to the bracket 410. The number of the front limit plates 460 is the same as that of the spring seat 450. The front limit plates 460 are arranged opposite to the spring seat 450. The guide rod 440 is connected between the spring seat 450 and the front limit plate 460, so as to facilitate the installation of the front guide rod 440 on the bracket 410. The tension slider 420 is limited between the spring seat 450 and the front limit plate 460. The front limit plate 460 and the spring seat 450 limit the tension slider 420 and the elastic member 430, so that the tension slider 420 and the elastic member 430 will not be separated from the bracket 410.

[0075] Reference Figure 8 and Figure 9 The bracket 410 includes a left support plate 411 and a right support plate 412 which are radially spaced apart. A spring seat 450, a front stop plate 460 and a support rod are disposed on the left support plate 411 and the right support plate 412. A pulley shaft 413 is connected between the left support plate 411 and the right support plate 412. A first guide wheel 470 is disposed between the left support plate 411 and the right support plate 412. The first guide wheel 470 is rotatably matched with the pulley shaft 413.

[0076] The first guide wheel 470 is vertically arranged so that the first guide wheel 470 rotates in a vertical plane, and the cable 300 is closely wrapped around the first guide wheel 470. When the cable 300 moves, the first guide wheel 470 rotates to guide the cable 300, so that the cable 300 at the end of the rack 100 can smoothly convert from vertical movement to movement parallel to the rack 100.

[0077] Among them, annular flanges 471 are formed on opposite sides of the first guide wheel 470. The cable 300 on the circumferential side of the first guide wheel 470 is limited by the annular flanges 471 to prevent the cable 300 from deviating from the first guide wheel 470 when moving.

[0078] In this embodiment, the tension slider 420 is arranged on the circumferential side of the first guide wheel 470 so that the tension slider 420 is driven to move when the cable 300 moves along the first guide wheel 470. Specifically, in this embodiment, the tension slider 420 is arranged above the first guide wheel 470.

[0079] In this embodiment, the guide rod 440 is arranged on the circumferential side of the first guide wheel 470 and a gap is formed between the guide rod 440 and the first guide wheel 470 so that the tension slider 420 can slide on the outer circumference of the first guide wheel 470. Among them, the guide rod 440 is bent into an arc shape, and the center of curvature of the guide rod 440 coincides with the center of the first guide wheel 470, so that the moving path of the tension slider 420 is parallel to the moving path of the cable 300 on the first guide wheel 470. Furthermore, when the tension slider 420 moves driven by the cable 300, it remains relatively stationary with respect to the cable 300, so that the pulling force of the cable 300 acts on the elastic member 430 stably through the tension slider 420.

[0080] The bracket 410 is rotatably connected with a second guide wheel 480, and the second guide wheel 480 is rotatably connected between the left support plate 411 and the right support plate 412. The second guide wheel 480 is arranged on the circumferential side of the first guide wheel 470 and above the first guide wheel 470. A guide groove 481 is formed on the circumferential side of the second guide wheel 480, and the cable 300 passes through the guide groove 481. The second guide wheel 480 and the first guide wheel 470 cooperate to guide and limit the cable 300, so that the cable 300 is limited outside the circumferential side of the first guide wheel 470 and located in the guide groove 481. Furthermore, when the cable 300 moves, it is stable and smooth, and is not easily separated from the limiting component 400.

[0081] Preferably, referring to Figures 7 to 10 , the limiting component 400 further includes a microswitch 490 and a controller. The microswitch 490 is connected to the bracket 410. The microswitch 490 is located on the moving path of the tension slider 420 and is arranged at an interval from the tension slider 420. The controller is electrically connected to the microswitch 490 and the reel 200. The controller controls the reel 200 to stop winding the cable 300 when the microswitch 490 is triggered. The limiting block 310 of the cable 300 abuts against the tension slider 420 and drives the tension slider 420 to move against the elastic force of the elastic member 430. When the tension slider 420 moves to trigger the microswitch 490, the reel 200 stops winding the cable 300, avoiding damaging the cable 300. Thus, there is no need for manual control to stop the reel 200, which is convenient for users to operate.

[0082] In this embodiment, two micro switches 490 are provided, and the two micro switches 490 are arranged in a mirror image on the sides of the left support plate 411 and the right support plate 412 facing away from each other. In addition, in other embodiments, only one micro switch 490 may be provided.

[0083] Among them, the micro switch 490 includes a switch body 491 and a switch wheel arm 492. The switch body 491 is fixed to the bracket 410, and the switch wheel arm 492 extends to the moving path of the tension slider 420. The switch wheel arm 492 is rotatably connected to the switch body 491, and an elastic reset member is connected between the switch wheel arm 492 and the switch body 491. The switch body 491 has two states of closed and open. Initially, the switch wheel arm 492 is kept in the closed position under the drive of the elastic reset member, and the switch body 491 is in the open state. At this time, the controller controls the reel 200 to normally wind. When the tension slider 420 touches the switch wheel arm 492, it drives the switch wheel arm 492 to rotate relative to the switch body 491 and leave the closed position, and the switch body 491 is in the open state. At this time, the controller controls the reel 200 to stop winding.

[0084] When the drive switch is triggered, the reel 200 stops rotating. Due to the inertia of the cable 300 during movement, the cable 300 will still move a small distance in the direction of the reel 200, and then move a small distance away from the reel 200 under the action of the elastic member 430. In this embodiment, the method of rotating the switch wheel arm 492 is used to trigger the micro switch 490, which can keep the tension slider 420 in contact with the switch wheel arm 492 all the time during the above-mentioned small movement, and keep the micro switch 490 in the open state. The elastic reset member can also drive the switch wheel arm 492 to closely follow the tension slider 420, and drive the switch wheel arm 492 to quickly reset to the closed position after the tension slider 420 disengages from the micro switch 490.

[0085] In addition, in other embodiments, other suitable micro switches 490 may also be used.

[0086] In other embodiments, a sensor may also be used to detect the position of the tension slider 420. After the tension slider 420 compresses the compression spring to reach the set position, the sensor outputs a signal to the controller, and the controller controls the reel to stop winding.

[0087] In this embodiment, the distance between the tension slider 420 and the micro switch 490 can be set according to the stiffness coefficient of the compression spring, the weight of the plug 500, and the inclination angle of the second end of the cable 300 relative to the vertical plane, so that when the winding wheel stops winding, the compression spring and the tension slider 420 can tension the cable 300, making the cable 300 not easy to shake.

[0088] The above is only the preferred embodiment of the present invention, so all equivalent changes or modifications made according to the structures, features and principles described in the scope of the present invention patent application are included in the scope of the present invention patent application.

Claims

1. An automatic retracting and extending system for a sling cable, characterized in that, The automatic retractable system (1000) comprises: Rack(100); A reel (200), the reel (200) being rotatably disposed on the frame (100); A cable (300), wherein a first end of the cable (300) is connected to the reel (200), the reel (200) is capable of reeling and conveying the cable (300), and a second end of the cable (300) is connected to a plug (500); A limit assembly (400), the limit assembly (400) comprising a bracket (410), a tension slider (420) and an elastic member (430), the bracket (410) being fixed to an end of the frame (100), the tension slider (420) being slidably disposed on the bracket (410) along the length direction of the cable (300); the elastic member (430) being disposed between the bracket (410) and the tension slider (420), the elastic member (430) providing the tension slider (420) with a force in a direction away from the reel (200); The tension slider (420) is provided with an escape opening (421), the cable (300) passes through the escape opening (421), a limit block (310) is radially protruded at the second end of the cable (300), and the limit block (310) is suitable for abutting against a side of the tension slider (420) away from the reel (200); The limit assembly (400) further comprises a micro switch (490) and a controller, wherein the micro switch (490) is connected to the bracket (410), the micro switch (490) is located on the moving path of the tension slider (420) and is spaced apart from the tension slider (420); the controller is electrically connected to the micro switch (490) and the reel (200), and when the micro switch (490) is triggered, the controller controls the reel (200) to stop reeling the cable (300); A guide rod (440) is fixedly arranged on the bracket (410), and the guide rod (440) extends in a direction away from the reel (200). A guide hole (422) is opened on the tension slider (420), and the guide rod (440) is slidably matched with the guide hole (422); The elastic member (430) includes a compression spring, a spring seat (450) is connected to the bracket (410), the spring seat (450) is connected to the guide rod (440), the spring seat (450) is arranged on the side of the tension slider (420) facing the reel (200), the compression spring is sleeved outside the guide rod (440), and the opposite ends of the compression spring are respectively in contact with the spring seat (450) and the tension slider (420); The bracket (410) is rotatably connected to a first guide wheel (470), and the first guide wheel (470) rotates in a vertical plane; the cable (300) is arranged around the first guide wheel (470), and the tension slider (420) is arranged around the first guide wheel (470); The guide rod (440) is arranged on the periphery of the first guide wheel (470) and forms a gap with the first guide wheel (470). The guide rod (440) is bent into an arc shape, and the center of curvature of the guide rod (440) coincides with the center of the first guide wheel (470). A front limit plate (460) is connected to the bracket (410). The front limit plate (460) is disposed opposite to the spring seat (450). One end of the guide rod (440) away from the spring seat (450) is connected to the front limit plate (460). The tension slider (420) is limited between the spring seat (450) and the front limit plate (460). The microswitch (490) includes a switch body (491) and a switch wheel arm (492). The switch body (491) is fixed to the bracket (410), and the switch wheel arm (492) extends to the moving path of the tension slider (420).

2. The automatic retracting and extending system for a sling cable according to claim 1, wherein, The bracket (410) is rotatably connected with a second guide wheel (480). The second guide wheel (480) is arranged on the periphery of the first guide wheel (470). A guide groove (481) is formed on the periphery of the second guide wheel (480), and the cable (300) passes through the guide groove (481).

3. The automatic retracting and extending system for a sling cable according to claim 1, characterized in that, The automatic retracting and extending system (1000) further includes an anti-off groove assembly (600). The anti-off groove assembly (600) includes a guide frame (610), two first rollers (620) arranged at intervals, and two second rollers (630) arranged at intervals. The guide frame (610) is arranged on the frame (100) and is located between the reel (200) and the limit assembly (400). The first rollers (620) and the second rollers (630) are rotatably connected to the guide frame (610). The second rollers (630) are arranged perpendicular to the first rollers (620). A guide space (640) for the cable (300) to pass through is formed by enclosing between the first rollers (620) and the second rollers (630).

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