Slow descending mechanism and lifting equipment capable of descending slowly

Abstract

The invention discloses a slow descending mechanism and lifting equipment capable of descending slowly, and relates to the technical field of constant-speed slow descending mechanisms, the slow descending mechanism comprises a propeller slow descending assembly, a band-type brake assembly, an electromagnetic slow descending assembly and a detection assembly, and a rotating shaft of the propeller slow descending assembly is connected with the band-type brake assembly and the slow descending mechanism through a belt wheel transmission mechanism; a rotating shaft of the propeller slow descending assembly is connected with a rope through a belt wheel, the detection assembly is arranged below the propeller slow descending assembly and used for detecting the rotating speed of the propeller slow descending assembly, and the detection assembly is in communication connection with the band-type brake assembly and the slow descending mechanism. The coil cutting magnetic field of the electromagnetic slow descending assembly is used for generating current, after short circuit connection, according to the Lenz's law, resistance generated by the slow descending device automatically adapts, the rotating speed is increased, the generated resistance is increased, the rotating speed is decreased, the generated resistance is decreased, and the whole descending process is smooth and free of the blocking phenomenon.

Description

Technical Field

[0001] The present invention relates to the technical field of uniform speed descent mechanisms, and particularly to a descent mechanism and a lifting device capable of descending at a slow speed. Background Art

[0002] A life-saving descent device is a common fire-fighting and life-saving equipment. In case of a fire, the escape personnel located on a high-rise building can escape from the fire scene along the outer wall of the building through the life-saving descent device. The modern education promotes quality education as the theme. How to carry out entertainment-based and gamified education in the development of quality education products is a direction being explored at present. The current entertainment facilities on the market cannot effectively combine entertainment and education. They can neither give full play to the wisdom of students nor enable them to feel the joy of learning. This product uses balls as a medium, integrates scientific knowledge, perfectly combines fun and knowledge, establishes an extremely interesting scientific experiment station, combines education with entertainment, stimulates children's curiosity, makes entertainment and education no longer conflict, and allows children to seek knowledge happily. When the life-saving descent device is applied in places such as children's exploration museums, science and technology museums, theme parks, indoor children's playgrounds, and educational institutions, it can be used as a self-lifting amusement device and a descent and life-saving demonstration device.

[0003] At present, after the life-saving descent equipment on the market is lifted, it descends in free fall. Although a buffer spring or a sandpit is added at the bottom of the equipment to play a certain buffering role, due to the relatively large final speed of free fall, the personnel still receive a relatively large reaction force at the bottom, posing a safety risk and affecting the comfort of the personnel. Summary of the Invention

[0004] The purpose of the present invention is to provide a descent mechanism and a lifting device capable of descending at a slow speed to solve the problems existing in the above-mentioned prior art, so that the speed of the descent process is controllable and smooth without jamming.

[0005] To achieve the above purpose, the present invention provides the following solution:

[0006] The present invention provides a descent mechanism, including a propeller descent component, a brake component, an electromagnetic descent component, a detection component, and a control unit. The rotating shaft of the propeller descent component is connected to the brake component and the electromagnetic descent component respectively through a belt pulley transmission mechanism. A rope is connected to the rotating shaft of the propeller descent component through a belt pulley. The detection component is arranged below the propeller descent component and is used to detect the rotation speed of the propeller descent component. Both the detection component and the brake component are communicatively connected to the control unit. Both ends of the rope are used to connect a fixed pulley group or a movable pulley group. The electromagnetic descent component and the brake component can reduce the rotation speed of the belt pulley.

[0007] Preferably, the propeller slow descent assembly includes a reduction propeller, a rotating shaft, a pulley and a one-way bearing. The middle part of the rotating shaft is connected to four pulleys by a key, one of which is a large pulley and the remaining three are small pulleys. The large pulley is used to wind the rope. The three small pulleys are respectively connected to the brake assembly, the electromagnetic slow descent assembly and the detection assembly through belts. Both ends of the rotating shaft are provided with a one-way bearing and a reduction propeller from the inside to the outside.

[0008] Preferably, the reduction propeller includes three blades and the planes of the blades are parallel to the axial direction of the rotating shaft, and the reduction propeller is connected to the end of the rotating shaft via a locking nut.

[0009] Preferably, the two one-way bearings are respectively connected to two arms of a base through bearing seats, and shaft sleeves are provided between the pulleys and the one-way bearings on both sides.

[0010] Preferably, the brake assembly includes a brake bracket, a rotating shaft, a pulley and an electromagnetic brake, both ends of the rotating shaft are rotatably connected to the brake bracket through seat bearings, the pulley and the electromagnetic brake are sequentially arranged on the middle part of the rotating shaft, and the pulley is transmission-connected to a small pulley on the propeller descent control assembly through a belt drive mechanism; the brake bracket is a U-shaped bracket, the pulley is connected to the rotating shaft through a key, and a sleeve is arranged between the pulley and the seat bearing.

[0011] Preferably, the electromagnetic descent control assembly includes a reduction motor and a pulley, the reduction motor is connected to the pulley, and the pulley is connected to the small pulley on the propeller descent control assembly through a belt transmission mechanism; a fixed bracket is provided on the reduction motor, and a pad is provided between the fixed bracket and the fixed surface.

[0012] Preferably, the detection assembly includes a speed sensor and a pulley, the speed sensor is connected to a small pulley on the propeller slow descent assembly through a belt drive mechanism, the diameter of the pulley on the speed sensor is the same as the diameter of the small pulley on the propeller slow descent assembly, and the speed sensor is a speed encoder and is used to detect the rotational speed of the rotating shaft of the propeller slow descent assembly.

[0013] Preferably, the detection component and the control unit are both arranged in the base of the propeller slow descent component, and the base is a U-shaped base.

[0014] The present invention also relates to a lifting device that can slowly descend, comprising the above-mentioned slow descent mechanism, a rope, a support frame, a movable pulley and a plurality of fixed pulleys, wherein the support frame is provided with a plurality of fixed pulleys according to a fixed space, one end of the rope is fixed, and the other end is fixed after being wound around a plurality of the fixed pulleys, a large pulley of the electromagnetic slow descent assembly and the movable pulley, and a bearing frame is installed on the movable pulley, and the bearing frame is used to carry people or objects.

[0015] Preferably, a plurality of movable pulleys arranged side by side form a movable pulley group, the bearing frame is mounted on the movable pulley group, a plurality of fixed pulleys arranged side by side form a fixed pulley group, the movable pulley group and the fixed pulley group have the same number of pulleys, after the rope passes around the large pulley of the electromagnetic slow descent assembly, the rope is then alternately and reciprocatingly wound around each pulley on the fixed pulley group and the movable pulley group and then fixed, the movable pulley group is located below the fixed pulley group; a certain pulley is also wound between the large pulley of the electromagnetic slow descent assembly and the fixed pulley group.

[0016] Compared with the prior art, the present invention has achieved the following technical effects:

[0017] The propeller slow-descent assembly of the present invention slows down through wind force, and the brake assembly can prevent the harm caused by excessive descent due to failure of the slow-descent mechanism, and can brake in time to protect the personal safety of the user; the electromagnetic slow-descent assembly cuts the magnetic field to generate current, and after short-circuiting, electromagnetic resistance is generated according to Lenz's law, and the resistance generated by increasing the speed becomes larger, and the resistance generated by decreasing the speed becomes smaller, and the entire landing process is smooth without any jamming. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the assembly structure of the slow-descent mechanism in an embodiment of the present invention;

[0020] Figure 2 It is a schematic diagram of the explosion structure of the slow-descent mechanism in an embodiment of the present invention;

[0021] Figure 3 It is a structural schematic diagram of a brake assembly in an embodiment of the present invention;

[0022] Figure 4 It is a structural schematic diagram of a brake bracket in an embodiment of the present invention;

[0023] Figure 5Schematic diagram of the structural connection relationship of the detection component in the embodiment of the present invention;

[0024] Figure 6 Schematic diagram of the structure of the deceleration propeller in the embodiment of the present invention;

[0025] Figure 7 Schematic diagram of the structure of the base in the embodiment of the present invention;

[0026] Figure 8 Schematic diagram of the internal structure of the deceleration motor in the embodiment of the present invention;

[0027] Figure 9 Schematic diagram of the principle of the lifting device capable of descending at a slow speed in the embodiment of the present invention;

[0028] In the figure: 1 - slow descent mechanism, 2 - large pulley, 3 - one-way bearing, 4 - base, 5 - deceleration motor, 6 - rotating shaft, 7 - bearing seat, 8 - small pulley, 9 - deceleration propeller, 10 - bushing, 11 - belt, 12 - electromagnetic brake, 13 - flat key, 14 - speed measurement sensor, 15 - control unit, 16 - lock nut, 17 - brake bracket, 18 - fixed bracket, 19 - rope, 20 - fixed pulley, 21 - fixed pulley group, 22 - movable pulley group, 23 - rotor, 24 - stator. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] It should be noted that in the description of the present invention, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "clockwise", "counterclockwise", etc. are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", "fourth" may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0031] In addition, it should be noted that in the description of the present invention, unless otherwise clearly defined and limited, the terms "set", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0032] The object of the present invention is to provide a descending mechanism and a lifting device capable of descending at a slow speed to solve the problems existing in the prior art, so that the speed during the descending process is controllable and smooth without jamming.

[0033] To make the above objects, features, and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Embodiment 1

[0035] As Figures 1 to 8 shown, in this embodiment, a descending mechanism 1 is provided, which includes a propeller descending component, a brake component, an electromagnetic descending component, a detection component, and a control unit 15. The rotating shaft 6 of the propeller descending component is connected to the brake component and the electromagnetic descending component respectively through a belt drive mechanism. A rope 19 is connected to the rotating shaft 6 of the propeller descending component through a belt. The detection component is arranged below the propeller descending component and is used to detect the rotation speed of the propeller descending component. The detection component is communicatively connected to the brake component and the control unit 15. In this embodiment, the speed detected by the detection component is fed back to the control unit 15, and the control unit 15 controls the opening and closing of the brake of the brake component. When the rotating shaft 6 of the propeller descending component descends too fast and exceeds the set value of the control unit 15, it will be detected by the detection component and then fed back to the control unit 15, thereby triggering the braking of the brake component.

[0036] As an alternative, in this embodiment, the propeller descent component includes a deceleration propeller 9, a rotating shaft 6, belt pulleys, and a one-way bearing 3. Four belt pulleys are connected to the middle of the rotating shaft 6 by keys, one of which is a large belt pulley 2 and the remaining three are small belt pulleys 8. A rope 19 is wound around the large belt pulley 2. The three small belt pulleys 8 are respectively connected to the brake component, the electromagnetic descent component, and the detection component through belts 11. One one-way bearing 3 and one deceleration propeller 9 are arranged from the inside to the outside at both ends of the rotating shaft 6. Among them, the rope 19 is wound around the large belt pulley 2. If the pulling direction of the rope 19 is forward rotation, due to the function of the one-way bearing 3, it will not drive other mechanisms to rotate; when rotating in reverse, the one-way bearing 3 starts to do work and drives other mechanisms to rotate. The propeller descent component can be selectively assembled to play a role in aesthetic decoration and primary buffering. In this embodiment, the diameters of each belt pulley are as follows: the diameter of the large belt pulley 2 is 136 mm, the diameters of the 2 belt pulleys connected to the brake component are 78 mm, the diameters of the 2 belt pulleys connected to the electromagnetic descent component are 78 mm, and the diameters of the 2 belt pulleys connected to the detection component are 94 mm. The large belt pulley 2 drives the other three belt pulleys to rotate. These three belt pulleys are connected to three descent structures through belts 11 to start working, gradually realizing the functions of descent and stop rotation, and thus ensuring the safety of the people or objects carried on the rope 19.

[0037] As an alternative, in this embodiment, the deceleration propeller 9 includes three blades and the blade plane is parallel to the axis direction of the rotating shaft 6. The deceleration propeller 9 is connected to the end of the rotating shaft 6 through a lock nut 16. In this embodiment, the rope 19 drives the large belt pulley 2 and the rotating shaft 6 to rotate. The rotation of the rotating shaft 6 drives the blades to rotate. The blades of the propeller descent component rotate, and the air generates resistance to its rotation, thereby slowing down the descending speed of the rope 19.

[0038] As an alternative, in this embodiment, the two one-way bearings 3 are respectively connected to the two arms of a base 4 through bearing seats 7. Sleeve 10 is arranged between the belt pulleys on both sides and the one-way bearings 3. The base 4 is preferably a U-shaped base, which is convenient for accommodating and fixing the detection component. The one-way bearing 3 is sleeved on the rotating shaft 6. The sleeve 10 is located on both sides of the belt pulley. One one-way bearing 3 is provided on each side of the sleeve 10. The inside of the belt pulley is connected to the rotating shaft 6 by a flat key 13. The sleeve 10 plays an isolating role.

[0039] As an alternative, in this embodiment, the brake assembly includes a brake bracket 17, a rotating shaft 6, a belt pulley, and an electromagnetic brake 12. Both ends of the rotating shaft 6 are rotatably connected to the brake bracket 17 through bearing blocks with seats. On both sides of the rotating shaft of the brake bracket 17, there are two bearing blocks 7 with plain bearings. In the middle of the rotating shaft 6, a belt pulley and an electromagnetic brake 12 are arranged in sequence. The belt pulley is connected to the small belt pulley 8 on the propeller descent assembly through a belt 11. In this embodiment, when the electromagnetic descent assembly fails, the control unit 15 will start the brake system according to the rotation speed of the rotating shaft 6 detected by the detection assembly, stop the rotation of the rotating shaft 6, prevent the rotation speed of the rotating shaft 6 from being too large, and thus avoid the impact feeling during landing.

[0040] As an alternative, in this embodiment, the brake bracket 17 is a U-shaped bracket. The belt pulley is connected to the rotating shaft 6 by a key, preferably a flat key 13. A shaft sleeve 10 is arranged between the belt pulley and the bearing block with seat.

[0041] As an alternative, in this embodiment, the electromagnetic descent assembly includes a reduction motor 5 and a belt pulley. A belt pulley is connected to the reduction motor 5. The belt pulley is connected to the small belt pulley 8 on the propeller descent assembly through a belt 11. In this embodiment, the rope 19 drives the large belt pulley 2 and the rotating shaft 6 to rotate. The rotating shaft 6 drives the small belt pulley 8 to rotate, and then drives the rotating shaft 6 of the reduction motor 5 to rotate through the belt 11. Among them, the rotor 23 of the reduction motor 5 is composed of a rotating shaft 6 and a coil. The stator 24 is an arc-shaped magnetic sheet and is embedded on the inner wall of the motor housing. When an external force drives the rotating shaft of the reduction motor 5 to rotate, the rotor 23 rotates, causing the magnetic flux inside the reduction motor 5 to change. According to Lenz's law, the rotating shaft 6 of the reduction motor 5 rotates to cut the magnetic induction line, generating a corresponding electromagnetic resistance, thereby generating a resistance to prevent the rotating shaft 6 from continuing to rotate. It is to utilize the fact that when the reduction motor 5 is in a non-powered state, it is very difficult to rotate the motor, to achieve the function of slow descent. Thus, essentially, when the motor is not powered on, if there is a change in the external magnetic field that causes the magnetic flux inside the motor to change, a corresponding resistance will indeed be generated according to Lenz's law. For example, when the rotor 23 of the motor rotates rapidly under the action of an external force, the rotation of the rotor 23 will cause a change in the magnetic flux passing through the motor winding. At this time, an induced current will be generated, and the magnetic field of the induced current will hinder the change in the magnetic flux, thereby showing a resistance effect to prevent the rotation of the rotor 23. In this embodiment, the resistance generated by the electromagnetic descent assembly changes adaptively. As the rotation speed increases, the generated resistance becomes larger; as the rotation speed decreases, the generated resistance becomes smaller, and the whole process is smooth without jamming.

[0042] As an alternative, in this embodiment, a fixed bracket 18 is arranged on the reduction motor 5. A cushion plate is arranged between the fixed bracket 18 and the fixed surface, which can reduce vibration. The fixed bracket is preferably a sheet metal fixing part for fixed support.

[0043] As an alternative, in this embodiment, the detection component includes a speed sensor 14 and a pulley. The speed sensor 14 is drivingly connected to a small pulley 8 on the propeller descent component through a belt drive mechanism. The diameter of the pulley on the speed sensor 14 is the same as that of the small pulley 8 on the propeller descent component. The speed sensor 14 is a speed encoder and is used to detect the rotational speed of the rotating shaft 6 of the propeller descent component. Among them, the rope 19 drives the large pulley 2 and the rotating shaft 6 to rotate. When it is detected that the rotational speed of the rotating shaft 6 exceeds the set value, the data will be uploaded to the control unit 15, and the control unit 15 will control the brake system to lock.

[0044] As an alternative, in this embodiment, both the detection component and the control unit 15 are arranged in the base 4 of the propeller descent component. The base 4 is a U-shaped base, which is convenient for accommodating and fixing the detection component.

[0045] Embodiment Two

[0046] As Figure 9 shown, this embodiment also provides a lifting device capable of descending at a slow speed, including the descent mechanism 1, the rope 19, the support frame, the movable pulley, and a plurality of fixed pulleys 20 in the above-mentioned Embodiment One. A plurality of fixed pulleys 20 are arranged on the support frame according to the fixed space, which play a role in guiding and spatial positioning. One end of the rope 19 is fixed, and the other end is wound around a plurality of fixed pulleys 20, the large pulley 2 of the electromagnetic descent component, and the movable pulley and then fixed. A carrier is installed on the movable pulley, and the carrier is used to carry people or objects.

[0047] As an alternative, in this embodiment, a plurality of juxtaposed movable pulleys form a movable pulley group 22, and a carrier is installed on the movable pulley group 22. A plurality of juxtaposed fixed pulleys 20 form a fixed pulley group 21. The number of pulleys in the movable pulley group 22 is the same as that in the fixed pulley group 21. After the rope 19 bypasses the large pulley 2 of the electromagnetic descent component, the rope 19 is alternately wound around the pulleys on the fixed pulley group 21 and the movable pulley group 22 and then fixed, which is convenient for carrying a greater weight. The movable pulley group 22 is located below the fixed pulley group 21; A fixed pulley 20 is also wound between the large pulley 2 of the electromagnetic descent component and the fixed pulley group 22.

[0048] The descent principle and the specific movement process of the descent mechanism 1 in this embodiment are as follows:

[0049] One end of the rope 19 is first fixedly connected to the bottom of the support frame of the overall device, and the other end sequentially passes through the large pulley 2, the movable pulley block 22, and the fixed pulley block 21. After winding around the fixed pulley block 21 and the movable pulley block 22 several times, finally, the end of the rope 19 is fixed above the support frame of the device. A person can sit on the seat below the movable pulley block 22 and pull the end of the rope 19 outwards. The large pulley 2 connected to the rope 19 rotates clockwise, and the person and the seat rise. Under the action of the one-way bearing 3, the rotating shaft 6 does not rotate, and the slow-down mechanism 1 does not play a role. When the seat or other lifting devices connected to the rope tail rise to the specified height, the person releases the end of the rope 19. Under the action of the self-weight of the person or the lifting device (seat), the large pulley 2 rotates counterclockwise. Under the action of the one-way bearing 3, the large pulley 2 drives the rotating shaft 6 and the small pulley 8 to rotate. The rotation of the rotating shaft 6 drives the deceleration propeller 9 to rotate. The deceleration propeller 9 plays a certain role in slow descent. At the same time, when the magnetic flux changes, the deceleration motor 5 starts to generate rotational resistance, further realizing the deceleration of the rotating shaft 4. When the deceleration of the deceleration motor 5 fails, if the rotational speed of the rotating shaft 6 detected by the detection component exceeds the set value, the control unit 15 will start the brake system vertically according to the rotational speed, so that the rotating shaft 6 stops rotating, ultimately avoiding a super-speed descent. Although the rope 19 is fixed, the movable pulley block 22 is movable. By pulling and bunching up one fixed end of the rope 19, the length of the rope 19 is shortened, and then the movable pulley block 22 will drive the human body to rise; when the rope 19 is released, the length of the rope 19 increases, the movable pulley block 22 descends, and the slow-down mechanism 1 will play a role, thus realizing a slow descent.

[0050] In this embodiment, the rotation of the rotating shaft 6 of the deceleration motor 5 cuts the magnetic field of the coil to generate current. According to Lenz's law, the resistance generated by the slow-down device automatically adapts. When the rotational speed increases, the generated resistance becomes larger; when the rotational speed decreases, the generated resistance becomes smaller, and the whole process is smooth without jamming; it solves the problems that it is impossible to rise with less effort and impossible to descend slowly in the current market, and can also protect the personal safety of players multiple times after the device fails.

[0051] In the present invention, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A slow descent mechanism, characterized in that: It includes a propeller slow descent assembly, a brake assembly, an electromagnetic slow descent assembly, a detection assembly and a control unit. The rotating shaft of the propeller slow descent assembly is respectively connected to the brake assembly and the electromagnetic slow descent assembly through a pulley transmission mechanism. The rotating shaft of the propeller slow descent assembly is connected with a rope through a pulley. The detection assembly is arranged below the propeller slow descent assembly and is used to detect the rotation speed of the propeller slow descent assembly. The detection assembly and the brake assembly are both communicatively connected to the control unit. Both ends of the rope are used to connect a fixed pulley group or a movable pulley group. The electromagnetic slow descent assembly and the brake assembly can reduce the rotation speed of the pulley.

2. The slow descent mechanism according to claim 1, characterized in that: The propeller slow descent assembly includes a reduction propeller, a rotating shaft, a pulley and a one-way bearing. The middle part of the rotating shaft is connected to four pulleys by a key, one of which is a large pulley and the remaining three are small pulleys. The large pulley is used to wind the rope. The three small pulleys are respectively connected to the brake assembly, the electromagnetic slow descent assembly and the detection assembly through belts. Both ends of the rotating shaft are provided with a one-way bearing and a reduction propeller from the inside to the outside.

3. The slow descent mechanism according to claim 2, characterized in that: The reduction propeller includes three blades, and the planes of the blades are parallel to the axial direction of the rotating shaft. The reduction propeller is connected to the end of the rotating shaft through a locking nut.

4. The slow descent mechanism according to claim 2, characterized in that: The two one-way bearings are respectively connected to two arms of a base through bearing seats, and shaft sleeves are arranged between the pulleys and the one-way bearings on both sides.

5. The slow descent mechanism according to claim 1, characterized in that: The brake assembly includes a brake bracket, a rotating shaft, a pulley and an electromagnetic brake. Both ends of the rotating shaft are rotatably connected to the brake bracket through seat bearings. The middle part of the rotating shaft is sequentially provided with the pulley and the electromagnetic brake. The pulley is connected to a small pulley on the propeller slow descent assembly through a belt transmission mechanism. The brake bracket is a U-shaped bracket. The pulley is connected to the rotating shaft through a key. A sleeve is provided between the pulley and the seat bearing.

6. The slow descent mechanism according to claim 1, characterized in that: The electromagnetic descent control assembly includes a reduction motor and a pulley, the reduction motor is connected to the pulley, and the pulley is connected to the small pulley on the propeller descent control assembly through a belt transmission mechanism; a fixed bracket is arranged on the reduction motor, and a pad is arranged between the fixed bracket and the fixed surface.

7. The slow descent mechanism according to claim 1, characterized in that: The detection component includes a speed sensor and a pulley. The speed sensor is connected to a small pulley on the propeller slow descent assembly through a belt drive mechanism. The diameter of the pulley on the speed sensor is the same as the diameter of the small pulley on the propeller slow descent assembly. The speed sensor is a speed encoder and is used to detect the rotational speed of the rotating shaft of the propeller slow descent assembly.

8. The slow descent mechanism according to claim 7, characterized in that: The detection component and the control unit are both arranged in the base of the propeller slow-down component, and the base is a U-shaped base.

9. A lifting device capable of slow descent, characterized in that: It comprises the descending control mechanism, rope, support frame, movable pulley and several fixed pulleys as described in any one of claims 1 to 8, wherein several fixed pulleys are arranged on the support frame according to the fixed space, one end of the rope is fixed, and the other end is fixed after being wound around several fixed pulleys, the large pulley of the electromagnetic descending control assembly and the movable pulley, and a bearing frame is installed on the movable pulley, and the bearing frame is used to carry people or objects.

10. The lifting device capable of slow descent according to claim 9, characterized in that: A plurality of movable pulleys arranged side by side form a movable pulley group, the bearing frame is mounted on the movable pulley group, a plurality of fixed pulleys arranged side by side form a fixed pulley group, the movable pulley group and the fixed pulley group have the same number of pulleys, after the rope passes around the large pulley of the electromagnetic slow descent assembly, the rope is then alternately and reciprocatingly wound around each pulley on the fixed pulley group and the movable pulley group and then fixed, so that the weight of the bearing frame of the movable pulley group on which people or goods are carried is increased, the movable pulley group is located below the fixed pulley group; a certain pulley is also wound between the large pulley of the electromagnetic slow descent assembly and the fixed pulley group.

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