Swimming pool ladder with slow descending function

Abstract

The swimming pool ladder with the slow descending function comprises a main body frame, floating body pedals, a lifting device, a metal flat plate and a magnetic damping magnet block, the lifting device comprises four groups of pulley assemblies and rope bodies connected end to end, and the rope bodies sequentially penetrate through a first lower pulley, an upper pulley and a second lower pulley in the same group. The floating body pedal penetrates through the pulleys and the rope bodies in the same mode to form an arrangement with four inner vertical ropes and four outer vertical ropes, the floating body pedal is fixedly connected with the four inner vertical ropes through the connecting body, the connecting body is provided with a flat plate channel for the metal flat plate to penetrate through, and magnetic damping magnet blocks are installed on the two sides of the flat plate channel. And the metal flat plate is fixed in the main body frame and penetrates through the flat plate channel of the connecting body. The swimming pool ladder is simple in structure, free of additional driving devices, easy and convenient to use and operate, smooth and stable in the descending process and suitable for being installed and used in most swimming pools.

Description

Technical Field

[0001] The present invention relates to a swimming pool ladder with a slow descent function. Background Art

[0002] Generally, fixed ladders are configured in existing swimming pools. When entering or leaving the swimming pool, it is necessary to climb the ladder, which is time-consuming and laborious. If a ladder that can automatically descend is equipped in the swimming pool, people will be more convenient and faster when entering the swimming pool, and it can also reduce the risk of accidents due to climbing the ladder.

[0003] Chinese Invention Patent No. 201710913882.4 discloses a lifting type device for getting in and out of a private swimming pool, including a triggering mechanism and a plurality of lifting components; the plurality of lifting components are arranged at the bottom of the swimming pool, and the plurality of lifting components are arranged in a row from the shore of the swimming pool towards the central direction; the triggering mechanism is used to control the start of the lifting components; when the triggering mechanism issues a start signal, the plurality of lifting components rise simultaneously to form a stepped shape; when the triggering mechanism issues a closing signal, the lifting components descend until they are flush with the bottom of the swimming pool. This invention facilitates the entry and exit of swimmers through the lifting components, avoiding the need to climb up and down in the prior art. This invention requires multiple driving units, and uses hydraulic cylinders as the driving units. Applying it in water has the disadvantages of complex structure and difficult maintenance. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to provide a swimming pool ladder with a slow descent function, which has a simple structure, does not require additional driving devices, is easy to use and operate, has a smooth and stable descent process, and is suitable for installation and use in most swimming pools.

[0005] The technical solution for solving the above technical problem is: a swimming pool ladder with a slow descent function, including a main body frame, a floating pedal, a lifting device, a metal plate, and a magnetic damping magnet block. The lifting device includes a pulley assembly and a rope body connected end to end. There are four groups of pulley assemblies. Each group of pulley assemblies is composed of an upper pulley, a lower pulley one, and a lower pulley two. The upper pulley is installed at the top of the main body frame through a pulley seat. The lower pulley one and the lower pulley two of the same group are respectively installed on the main body frame below the upper pulley through pulley seats. The rope body passes through the lower pulley one, the upper pulley, and the lower pulley two of the same group in sequence, and then passes through the adjacent pulley assemblies in the same way. The rope body forms an arrangement with 4 inner vertical ropes and 4 outer vertical ropes. The connecting lines of the centers of the 4 inner vertical ropes form a regular quadrilateral. The floating pedal is fixedly connected to the 4 inner vertical ropes respectively through a connecting body. A flat plate channel for the metal plate to pass through is provided on the connecting body, and magnetic damping magnet blocks are installed on both sides of the flat plate channel. The metal plate is fixed inside the main body frame and passes through the flat plate channel of the connecting body. At least one floating pedal is provided, and the density of the floating pedal is less than that of water.

[0006] Further, the connecting body is mainly a square box body with a front end and a lower end opening, which is composed of an upper panel, a rear panel and two side panels. The rear ends of the side panels of the square box body are connected with a back panel through connecting plates. A flat plate channel is formed between the back panel and the rear panel. Magnetic damping magnet blocks are installed on one side of the back panel and the rear panel away from the flat plate channel.

[0007] Further, three floating pedals are arranged vertically. The bottom surface of the floating pedal is fixedly connected with the upper panel of the connecting body, and the side surface of the connecting body is fixedly connected with a vertical rope inside the strip.

[0008] Further, a locking device for limiting the downward movement of the floating pedal is installed on the uppermost floating pedal.

[0009] Further, the locking device includes a base, a fixed connecting rod support, a lock tongue assembly, a first spring, a second spring, a connecting rod assembly, a pressing rod and an upper shell. The base includes a bottom plate and two lock tongue support plates respectively installed at both ends of the bottom plate. The lock tongue assembly includes a quadrilateral lock tongue and a movable connecting rod support fixed on the quadrilateral lock tongue. The quadrilateral lock tongue is placed on the lock tongue support plate of the base and is parallel to the bottom plate. There is a spacing between the movable connecting rod support and the bottom plate. One end of the connecting rod assembly is hinged on the fixed connecting rod support, and the fixed connecting rod support is fixedly installed on the bottom plate. The other end of the connecting rod assembly is hinged on the movable connecting rod support. The two ends of the first spring are respectively connected with the fixed connecting rod support and the movable connecting rod support. The two ends of the second spring are respectively connected with the movable connecting rod support and one of the lock tongue support plates. The pressing rod passes through the upper shell and is perpendicular to the bottom plate. The pressing rod is in surface contact with the connecting rod assembly. The base and the upper shell form an outer shell. The first spring, the second spring and the connecting rod assembly are located inside the outer shell. The two ends of the quadrilateral lock tongue of the lock tongue assembly pass through the outer shell and are located on both sides of the outer shell. The rest of the lock tongue assembly is located inside the outer shell. The upper part of the pressing rod passes through the top surface of the upper shell. When there is no external force, the first spring and the second spring are equal in force and are both in a compressed state. The lengths of the two ends of the quadrilateral lock tongue of the lock tongue assembly extending out of both sides of the outer shell are not equal.

[0010] Further, the connecting rod assembly of the locking device includes a first connecting rod, a second connecting rod and a third connecting rod. The two ends of the second connecting rod are respectively hinged with one end of the first connecting rod and the third connecting rod. The other end of the first connecting rod is hinged with the fixed connecting rod support. The other end of the third connecting rod is hinged with the movable connecting rod support. The first connecting rod and the third connecting rod are of equal length. The second connecting rod is in a position parallel to the bottom plate. The included angles α and β formed between the first connecting rod, the third connecting rod and the second connecting rod are equal and are 110-140°. The bottom end of the pressing rod is in surface contact with the second connecting rod.

[0011] Further, perforated balls are installed at both ends of the quadrilateral lock tongue of the locking device located outside the outer shell.

[0012] Further, a guiding wedge block is provided on the main body frame to retract the four-sided tongue of the locking device along the wedge block.

[0013] Further, a first handrail is provided on the main body frame.

[0014] Further, a second handrail is provided on the topmost floating pedal.

[0015] Due to the adoption of the above technical solutions, the present invention has the following beneficial effects: 1. The structure of the pool ladder is simple, without the need to configure an additional drive unit, and the maintenance and repair are relatively easy. When the user stands on the topmost floating pedal during use, the weight of the human body is greater than the buoyancy provided by the floating pedal, and the floating pedal descends, bringing the user into the pool, with simple operation.

[0016] 2. The rope-tied lifting device is connected to the floating pedal. The rope-tied lifting device uses the cooperation of pulleys and ropes. Through reasonable arrangement, the four ropes fixedly connected to the floating pedal can move synchronously. The floating pedal moves synchronously with the rising and falling of the ropes. Since the ropes pulling the floating pedal can always move synchronously, the floating pedal can maintain a balanced and stable posture during the rising and falling processes. Due to the constraint of the ropes on the floating pedal, the floating pedal remains horizontal during the lifting and lowering processes and does not tilt. The floating pedal has a relatively large cross-section and has a certain buffering effect, and will not suddenly sink or suddenly rise during the rising and falling processes.

[0017] 3. During the descending process of the floating pedal, a displacement occurs between the magnetic damping magnet block and the metal plate, generating eddy currents in the metal plate. The faster the descending speed, the stronger the eddy currents; an electromagnetic force that resists relative movement is generated between the eddy currents and the damping magnet block, and the descending speed of the floating pedal becomes slower and finally reaches a stable speed, which can ensure a smooth and stable descending process of the floating pedal.

[0018] 4. The locking device adopted in the present invention is in a balanced state during operation, stable and reliable. The locking device of the present invention mainly pushes the tongue assembly to move left and right by pressing the connecting rod assembly, thereby realizing locking or unlocking. The whole device has a simple structure, and the maintenance and repair are relatively easier. When there is no external force in the present invention, Spring 1 and Spring 2 are in a state of equal force. The tongue assembly extends a greater length from the bottom plate at one end than the other end under the action of the two springs. When the longer end extends above the main body frame, the downward movement of the floating pedal can be locked, and the locking stability is better and more reliable. The locking device of the present invention uses pressing to unlock, without the need to rotate to unlock, and the operation is more convenient and fast.

[0019] Next, in combination with the drawings and embodiments, the technical features of a pool ladder with a slow descent function of the present invention will be further described. Description of the Drawings

[0020] Figure 1 : Usage state diagram of the swimming pool ladder with a slow descent function according to the present invention.

[0021] Figure 2 : Perspective view of the swimming pool ladder with a slow descent function according to the present invention.

[0022] Figure 3 : Schematic diagram of the connection relationship among the floating pedal, the connecting body and the lifting device according to the present invention.

[0023] Figure 4 : Schematic diagram of the main frame and the metal flat plate structure according to the present invention.

[0024] Figure 5 : Schematic diagram of the main frame and the metal flat plate structure according to the present invention (the outermost shell of the main frame is omitted).

[0025] Figure 6 : Schematic diagram of the connection relationship among the floating pedal, the connecting body, the lifting device and the main frame according to the present invention (one).

[0026] Figure 7 : Schematic diagram of the connection relationship among the floating pedal, the connecting body, the lifting device and the main frame according to the present invention (two).

[0027] Figure 8 : Schematic diagram of the structure of the lifting device according to the present invention.

[0028] Figure 9 : Schematic diagram of the floating pedal and the connecting body according to the present invention.

[0029] Figure 10 : Schematic diagram of the floating pedal, the connecting body and the metal flat plate according to the present invention.

[0030] Figure 11 : Perspective view of the connecting body and the magnetic damping magnet block according to the present invention (one).

[0031] Figure 12 : Perspective view of the connecting body and the magnetic damping magnet block according to the present invention (two).

[0032] Figure 13 : Top view of the connecting body and the magnetic damping magnet block according to the present invention.

[0033] Figure 14 : Perspective view of the locking device according to the present invention.

[0034] Figure 15 : Top view of the locking device according to the present invention.

[0035] Figure 16 : Figure 15 A - A sectional view of

[0036] Figure 17:Top view of the locking device of the present invention (upper shell omitted).

[0037] Figure 18 :Front view of the locking device of the present invention (upper shell omitted).

[0038] Figure 19 :Operating state diagram of the locking device of the present invention.

[0039] In the figure, 1 - main body frame, 2 - metal flat plate.

[0040] 3 - lifting device, 31 - pulley assembly, 311 - upper pulley, 312 - lower pulley 1, 313 - lower pulley 2, 32 - rope body, 321 - inner vertical rope, 322 - outer vertical rope, 33 - pulley seat.

[0041] 4 - floating pedal, 5 - magnetic damping magnet block.

[0042] 6 - connecting body, 61 - upper panel, 62 - rear panel, 63 - side panel, 64 - connecting plate, 65 - back panel, 66 - flat plate channel.

[0043] 7 - locking device, 71 - base, 711 - bottom plate, 712 - lock tongue support plate, 72 - upper shell, 721 - upper shell main body, 722 - housing, 723 - cylindrical hole, 73 - lock tongue assembly, 731 - movable link support, 732 - quadrilateral lock tongue, 74 - perforated ball, 75 - pressing rod, 76 - spring 1, 77 - fixed link support, 78 - link assembly, 781 - link 1, 782 - link 2, 783 - link 3, 79 - spring 2, 710 - pressing plate.

[0044] 8 - handrail 1, 9 - handrail 2, 10 - guiding wedge block.

[0045] Figure 8 The arrow in the figure indicates the movement direction of the rope body when the floating pedal descends. Detailed implementation method

[0046] Embodiment 1: A swimming pool ladder with a slow - descent function, as Figures 1 - 13, including a main body frame 1, a floating pedal 4, a lifting device 3, a metal flat plate 2, a magnetic damping magnet block 5, and a connecting body 6. The lifting device 3 includes a pulley assembly 31 and a rope body 32 connected end to end. There are four groups of pulley assemblies 3. Each group of pulley assemblies is composed of an upper pulley 311, a lower pulley one 312, and a lower pulley two 313. The upper pulley is installed at the top of the main body frame 1 through a pulley seat 33. The lower pulley one 311 and the lower pulley two 312 of the same group are respectively installed on the main body frame 1 below the upper pulley through pulley seats 33. The rope body 32 passes through the lower pulley one, the upper pulley, and the lower pulley two of the same group in sequence, and then passes through the pulley assemblies of adjacent groups in the same way, that is, the rope body passes through the upper left pulley assembly, the lower left pulley assembly, the lower right pulley assembly, and the upper right pulley assembly in sequence, and finally the rope body returns to the upper left pulley assembly to form a closed loop. The rope body is moderately tensioned on the pulley without shaking. The rope body forms an arrangement with 4 inner vertical ropes 321 and 4 outer vertical ropes 322. The center point connection line of the 4 inner vertical ropes forms a regular quadrilateral. Three floating pedals 4 are arranged vertically one above the other. The connecting body 6 is mainly a square box body with a front end and a lower end opening, composed of an upper panel 61, a rear panel 62, and two side panels 63. The rear end of the side panel of the square box body is connected to a back panel 65 through a connecting plate 64. A flat plate channel 66 is formed between the back panel and the rear panel. Magnetic damping magnet blocks 5 are installed on both sides of the back panel 65 and the rear panel 62 away from the flat plate channel. The bottom surface of the floating pedal 4 is fixedly connected to the upper panel 61 of the connecting body 6, and the side surface of the connecting body is fixedly connected to the 4 inner vertical ropes 321. The metal flat plate 2 is fixedly installed in the main body frame 1, and the metal flat plate 2 passes through the flat plate channel 66 of the connecting body. The horizontal distance between the metal flat plate and the magnetic damping magnet block is preferably 10 - 20 mm.

[0047] The installation sequence of the rope body 32 of the lifting device 3 ensures that the moving directions of the 4 inner vertical ropes 321 fixing the connecting body 6 are the same and the displacements are equal. During operation, the moving directions of the 4 inner vertical ropes 321 are the same, and the moving directions of the 4 outer vertical ropes 322 are the same. The moving direction of the inner vertical ropes 321 is opposite to that of the outer vertical ropes 322 and the moving distances are equal. When the floating pedal 4 descends, the 4 inner vertical ropes 321 move downward synchronously, and the 4 outer vertical ropes 322 move upward (as shown by the arrows in Figure 8 ). When the floating pedal 4 ascends, the 4 inner vertical ropes 321 move upward synchronously, and the 4 outer vertical ropes 322 move downward.

[0048] In this embodiment, a guiding wedge 10 is provided on the main body frame to retract the four-sided locking tongue of the locking device along the wedge. A handrail one 8 is provided on the main body frame. A handrail two 9 is provided on the topmost floating pedal.

[0049] In this embodiment, a locking device 7 for restricting the downward movement of the floating pedal is installed on the topmost floating pedal. The locking device (asFigures 14 - 19 As shown in the figure, it includes a base 71, a fixed connecting rod support 77, a lock tongue assembly 73, a first spring 76, a second spring 79, a connecting rod assembly 78, a pressing rod 75 and an upper shell 72. The base 71 includes a bottom plate 711 and two lock tongue support plates 712 respectively installed at both ends of the bottom plate. The lock tongue assembly 73 includes a quadrilateral lock tongue 732 and a movable connecting rod support 731 fixed on the lock tongue. The quadrilateral lock tongue is placed on the lock tongue support plate of the base parallel to the bottom plate. The movable connecting rod support is fixed between the two long frames of the lock tongue. There is a spacing between the movable connecting rod support and the bottom plate, that is, the movable connecting rod support 731 does not contact the bottom plate. The quadrilateral lock tongue 732 can move left and right following the movable connecting rod support 731. One end of the connecting rod assembly 78 is hinged on the fixed connecting rod support 77, and the fixed connecting rod support 77 is fixedly installed on the bottom plate 711. The other end of the connecting rod assembly is hinged on the movable connecting rod support 731. The two ends of the first spring 76 are respectively connected to the fixed connecting rod support 77 and the movable connecting rod support 731. The two ends of the second spring 79 are respectively connected to the movable connecting rod support 731 and one of the lock tongue support plates 712. The center lines of the first spring 76 and the second spring 79 are basically coincident. The pressing rod 75 passes through the cylindrical hole of the upper shell and is perpendicular to the bottom plate. The pressing rod is in surface contact with the connecting rod assembly. The connecting rod assembly can be pushed to act by the pressing rod 75. A pressing disc 710 is provided at the top end of the pressing rod 75 to facilitate the operation of the pressing rod 75. The base 71 and the upper shell 72 form an outer shell. The first spring 76, the second spring 79 and the connecting rod assembly 78 are located inside the outer shell. The two ends of the quadrilateral lock tongue 732 of the lock tongue assembly pass through the outer shell and are located on both sides of the outer side of the shell. The rest of the lock tongue assembly 73 is located inside the outer shell. The upper part of the pressing rod 75 passes through the top surface of the upper shell and is located outside the top surface of the outer shell. The lock tongue assembly can move parallel to the bottom plate on the base along the center line of the spring. When there is no external force, the first spring 76 and the second spring 79 are in a static equilibrium state, that is, the compression lengths of the first spring and the second spring are equal and the forces are equal. The lock tongue assembly is in a static equilibrium position. The lengths of the two ends of the quadrilateral lock tongue 732 of the lock tongue assembly extending out of both sides of the outer shell are not equal. That is, the length of one end of the quadrilateral lock tongue 732 close to the fixed connecting rod support 77 extending out of the outer shell is greater than the length of the other end of the quadrilateral lock tongue 732 extending out of the outer shell. One end of the quadrilateral lock tongue 732 close to the fixed connecting rod support 77 is in an extended state, and the other end is in a retracted state. Perforated balls 74 are installed on both ends of the quadrilateral lock tongue located outside the outer shell. In the locked state, the end of the quadrilateral lock tongue 732 in the extended state is located above the main body frame 1, restricting the downward movement of the floating pedal 4.

[0050] In this embodiment, the connecting rod assembly 78 includes a first connecting rod 781, a second connecting rod 782, and a third connecting rod 783. The two ends of the second connecting rod are respectively hinged to one end of the first connecting rod and the third connecting rod through connecting rod pins. The other end of the first connecting rod 781 is hinged to the fixed connecting rod support 77 through a connecting rod pin. The other end of the third connecting rod 783 is hinged to the movable connecting rod support 731 through a connecting rod pin. When there is no external force, the second connecting rod is in a position parallel to the bottom plate, and the included angle α and the included angle β formed between the first connecting rod, the third connecting rod and the second connecting rod are equal, which is 110-120°. The pressing rod 75 is a cylinder, and the pressing rod 75 has an unequal diameter structure with a larger bottom and a smaller top to prevent it from slipping out of the upper shell. The bottom end of the pressing rod 75 is in surface contact with the second connecting rod 782. The upper shell includes an upper shell main body 721. On the top surface of the upper shell main body 721, there is a shell 722 that protrudes upward for placing the connecting rod assembly and the pressing rod. A cylindrical hole 723 (as Figure 10 shown) is provided on the shell 722. The base 71 and the upper shell 72 form a cuboid outer shell with a top surface protruding shell and a cylindrical hole. The pressing rod 75 is constrained by the shell 722 and the cylindrical hole 723 to be perpendicular to the bottom plate and can only move up and down along the center line of its own cylinder. Pressing down the pressing rod 75 applies a force to the connecting rod assembly 78, and the lock tongue assembly 73 moves driven by the connecting rod assembly 78, that is, the included angle α and the included angle β formed between the first connecting rod, the third connecting rod and the second connecting rod in the connecting rod assembly increase. The third connecting rod 783 pushes the movable connecting rod support 731 to move away from the fixed connecting rod support 77, causing the first spring 76 to elongate and the second spring 79 to be compressed. The original protruding end of the quadrilateral lock tongue 732 retracts, and the retracted section protrudes, realizing unlocking or locking. When the pressing rod 75 is released and there is no external force, under the action of the first spring 76 and the second spring 79, the lock tongue assembly returns to the static equilibrium position, the original protruding end protrudes, and the retracted end retracts, restoring the original state.

[0051] In this embodiment, the floating pedal is a cuboid pedal with an overall density less than that of water and can float on the water surface in a free state in water. As a variation, the floating pedal can also adopt other suitable shapes.

[0052] In this embodiment, the quadrilateral lock tongue 732 is a rectangular frame body, and the four sides forming the rectangular frame body are circular rods. Circular through holes for the circular rods to pass through are provided on the side surface of the outer shell. As a variation, the specific shape of the quadrilateral lock tongue can be determined according to actual needs.

[0053] Working process: The rope of the lifting device can guide the floating pedal to move up and down through the pulley assembly and keep it horizontal without tilting. When the user stands on the topmost floating pedal, the body weight is greater than the buoyancy provided by the floating pedal. When the user presses the pressing disc of the locking device, the four-sided locking tongue of the locking device retracts, the floating pedal is unlocked and starts to descend. Due to the restraint of the rope on the floating pedal, the floating pedal remains horizontal without tilting during the lifting process. The floating pedal has a relatively large cross-section and has a certain buffering effect, and will not suddenly sink or suddenly rise during the ascending and descending processes. During the descent of the floating pedal, a displacement is generated between the magnetic damping magnet block and the metal plate, and eddy currents are generated in the metal plate. The faster the descent speed, the stronger the eddy currents; an electromagnetic force that resists relative movement is generated between the eddy currents and the damping magnet block, and the descending speed of the floating body slows down and finally reaches a stable speed. After the user descends into the water and leaves the floating pedal, the floating pedal automatically rises under the action of buoyancy. The locking device guiding wedge block arranged on the main body frame can make the four-sided locking tongue of the locking device retract along the wedge block to ensure that the floating body rises to the locking position. After rising to the locking position, the four-sided locking tongue of the locking device automatically extends above the main body frame under the action of the spring force, and the floating pedal cannot move downward, and the floating pedal is locked.

Claims

1. A swimming pool ladder with a slow descent function, characterized in that: It includes a main frame (1), a floating pedal (4), a lifting device (3), a metal plate (2) and a magnetic damping magnet block (5). The lifting device (3) includes a pulley assembly (31) and a rope body (32) connected end to end. There are four groups of pulley assemblies. Each group of pulley assemblies is composed of an upper pulley (311), a lower pulley one (312) and a lower pulley two (313). The upper pulley is installed at the top of the main frame (1) through a pulley seat (33). The lower pulley one and the lower pulley two of the same group are respectively installed on the main frame below the upper pulley through pulley seats (33). The rope body passes through the lower pulley one, the upper pulley and the lower pulley two of the same group in sequence, and then passes through the pulley assemblies of adjacent groups in the same way. The rope body forms an arrangement with 4 inner vertical ropes (321) and 4 outer vertical ropes (322). The connecting lines of the centers of the 4 inner vertical ropes form a regular quadrilateral. The floating pedal is fixedly connected to the 4 inner vertical ropes respectively through a connecting body (6). A flat plate channel (66) for the metal plate to pass through is provided on the connecting body (6). Magnetic damping magnet blocks (5) are installed on both sides of the flat plate channel. The metal plate is fixed inside the main frame and passes through the flat plate channel of the connecting body. At least one floating pedal is provided, and the density of the floating pedal is less than that of water.

2. The pool ladder with a slow descent function according to claim 1, characterized in that: The connecting body (6) is mainly a square box body with a front end and a lower end opening, which is composed of an upper panel (61), a rear panel (62) and two side panels (63). The rear ends of the side panels of the square box body are connected with a back panel (65) through a connecting plate (64). A flat plate channel (66) is formed between the back panel and the rear panel. Magnetic damping magnet blocks (5) are installed on the sides of the back panel and the rear panel away from the flat plate channel.

3. The pool ladder with a slow descent function according to claim 2, characterized in that: Three floating pedals are arranged vertically one above the other. The bottom surface of the floating pedal is fixedly connected to the upper panel of the connecting body, and the side surface of the connecting body is fixedly connected to the 4 inner vertical ropes.

4. A swimming pool ladder with a slow descent function according to any one of claims 1-3, characterized in that: A locking device (7) for limiting the downward movement of the floating pedal is installed on the topmost floating pedal.

5. The pool ladder with a slow descent function according to claim 4, characterized in that: The locking device includes a base (71), a fixed connecting rod support (77), a locking tongue assembly (73), a first spring (76), a second spring (79), a connecting rod assembly (78), a pressing rod (75) and an upper shell (72). The base (71) includes a bottom plate (711) and two locking tongue support plates (712) respectively installed at both ends of the bottom plate. The locking tongue assembly (73) includes a quadrilateral locking tongue (732) and a movable connecting rod support (731) fixed on the quadrilateral locking tongue. The quadrilateral locking tongue is placed on the locking tongue support plate of the base and is parallel to the bottom plate, and there is a spacing between the movable connecting rod support and the bottom plate. One end of the connecting rod assembly (78) is hinged to the fixed connecting rod support (77), the fixed connecting rod support is fixedly installed on the bottom plate, and the other end of the connecting rod assembly is hinged to the movable connecting rod support (731). Both ends of the first spring (76) are connected to the fixed connecting rod support and the movable connecting rod support respectively. Both ends of the second spring (79) are connected to the movable connecting rod support and one of the locking tongue support plates respectively. The pressing rod (75) passes through the upper shell and is perpendicular to the bottom plate, and the pressing rod is in surface contact with the connecting rod assembly. The base and the upper shell form an outer shell. The first spring, the second spring and the connecting rod assembly are located inside the outer shell. Both ends of the quadrilateral locking tongue of the locking tongue assembly pass through the outer shell and are located on both sides of the outer shell. The rest of the locking tongue assembly is located inside the outer shell. The upper part of the pressing rod passes through the top surface of the upper shell. When there is no external force, the first spring and the second spring are equal in force and are both in a compressed state. The lengths of both ends of the quadrilateral locking tongue of the locking tongue assembly extending out of both sides of the outer shell are not equal.

6. The pool ladder with a slow descent function according to claim 5, characterized in that: The connecting rod assembly (78) of the locking device includes a first connecting rod (781), a second connecting rod (782) and a third connecting rod (783). Both ends of the second connecting rod are respectively hinged to one end of the first connecting rod and the third connecting rod. The other end of the first connecting rod (781) is hinged to the fixed connecting rod support (77). The other end of the third connecting rod (783) is hinged to the movable connecting rod support (731). The first connecting rod and the third connecting rod are of equal length. The second connecting rod is in a position parallel to the bottom plate. The included angle α and the included angle β formed between the first connecting rod, the third connecting rod and the second connecting rod are equal and are 110 - 140°. The bottom end of the pressing rod (75) is in surface contact with the second connecting rod.

7. The pool ladder with a slow descent function according to claim 6, characterized in that: Perforated balls (74) are installed at both ends of the quadrilateral locking tongue located outside the outer shell of the locking device.

8. A swimming pool ladder with a slow descent function according to claim 5, characterized in that: A guiding wedge block (10) for retracting the quadrilateral locking tongue of the locking device along the wedge block is provided on the main body frame.

9. A swimming pool ladder with a slow descent function according to any one of claims 1-3, characterized in that: A first handrail (8) is provided on the main body frame.

10. A swimming pool ladder with a slow descent function according to any one of claims 1-3, characterized in that: A second handrail (9) is provided on the topmost floating body pedal.

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