Lower limb lifting exerciser

Abstract

The invention relates to the technical field of lower limb lifting exercisers, in particular to a lower limb lifting exerciser which comprises a plate group, the plate group comprises a straight plate, movable sleeve plates sleeve the two sides of the straight plate, a frame group is arranged at the top end of the straight plate and comprises a beam plate, and insertion plates are connected to the two sides of the bottom end of the beam plate. The bottom end of the plate frame is fixedly connected with the straight plate, toothed plates are movably installed on the left side and the right side of the beam plate, lifting assemblies are movably installed on the outer sides of the toothed plates, and suspension assemblies are arranged at the top ends of the lifting assemblies. A driving motor controls a gear to rotate after being electrified beside the sickbed, the gear is matched with teeth of a toothed plate, then a movable plate is controlled and adjusted to move on the surface of the toothed plate, the movable plate is matched with a side hanging plate to drive a leg supporting plate to lift and move the shank position of a patient, and then the exercise state of the legs of the patient is guaranteed; the situation that the patient takes exercise by himself or herself is laborious is avoided, and the body burden of the patient is prevented from being

Description

Technical Field

[0001] The invention relates to the technical field of lower limb raising exercise equipment, in particular to a lower limb raising exercise equipment. Background Art

[0002] Patients who are bedridden for a long time are prone to deep vein thrombosis in their lower limbs, and their musculoskeletal system may also experience changes such as muscle atrophy and decreased bone density. Muscles maintain metabolic balance during exercise, promote the absorption and utilization of calcium and the transport of metabolic products within muscle tissue, which can prevent muscle atrophy, decreased muscle strength and decreased bone density. It has been confirmed that lower limb functional training can prevent and improve the above symptoms.

[0003] Traditional lower limb raising exercisers usually consist of a base, pedals, a resistance device and an adjustment mechanism. The base is used to stabilize the entire device, the pedals are for users to step on, and the resistance device provides adjustable resistance to meet the exercise needs of different users. However, since some patients are bedridden for a long time, their leg muscles are in a state of atrophy. Long-term leg raising and stepping activities put a heavy burden on the patients' bodies. Moreover, when the legs are raised, they can only move up and down at an angle with the assistance of the device, and the adjustable flexibility is poor. Therefore, a lower limb raising exerciser is needed to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to solve the problems raised in the above background technology.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A lower limb raising exerciser comprises a plate group, wherein the plate group comprises a straight plate, movable sleeve plates are installed on both sides of the straight plate, a frame group is arranged on the top of the straight plate, the frame group comprises a beam plate, plug plates are connected to both sides of the bottom end of the beam plate, and the plug plates are inserted into the plate frame through slots, the bottom end of the plate frame is connected and fixed to the straight plate, tooth plates are movably installed on the left and right sides of the beam plate, a lifting assembly is movably installed on the outer side of the tooth plate, and a suspension assembly is arranged on the top of the lifting assembly.

[0006] Preferably, return springs are connected to both ends of the straight plate, and the return springs are fixed to the inner wall of the movable sleeve plate. A fixing component is arranged on the outer side of the movable sleeve plate, and the fixing component includes a side plate sleeve fixed to the side of the movable sleeve plate, and a threaded shaft is inserted from top to bottom through a threaded hole at the top of the side plate sleeve, and a clamping plate is movably installed at the bottom end of the threaded shaft. When the movable sleeve plate is moved and adjusted, the threaded shaft can be moved in the threaded hole of the side plate sleeve, so that the threaded shaft can lift the clamping plate, and then the clamping plate is controlled to be buckled on the bottom side of the bed board, which is convenient for fixing the device and enables the exercise equipment to be adapted to the installation of different beds.

[0007] Preferably, a support rod is movably installed on the outer side of the tooth plate, and a slider is movably installed on the end of the support rod, and the slider is movably installed on the surface of the movable sleeve plate through a guide groove, the slider is threadedly sleeved on the surface of the threaded rotating rod, and one end of the threaded rotating rod is rotatably installed on the inner wall of the guide groove of the movable sleeve plate, and the slider can move in the guide groove on the surface of the movable sleeve plate through the cooperation between the external thread and the internal thread of the slider, and then the tooth plate is pushed by the support rod to change the inclination angle of the tooth plate, and the movable plate moves on the surface of the tooth plate, so that the patient's legs can be lifted and exercised at different angles.

[0008] Preferably, the threaded rotating rod consists of an axial end and a knob end, and the surface of the movable sleeve is provided with a groove adapted to the knob end. The groove design on the surface of the movable sleeve can facilitate the staff to twist the knob end of the threaded rotating rod, thereby ensuring the convenience of moving the slider.

[0009] Preferably, the lifting assembly includes a movable plate, which is sleeved on the surface of the tooth plate, and the movable plate is in a U-shaped structure. A rectangular block end is provided on the inner side of the U-shaped edge of the movable plate, and the rectangular block end is embedded in the edge of the tooth plate through a guide groove. The side of the movable plate is connected to a support plate, and a driving motor is installed on the top of the support plate. The shaft end of the driving motor is connected to a gear, and the gear is meshed with the surface of the tooth plate through teeth. The gear is driven to rotate by the shaft end of the driving motor, and the gear can cooperate with the outer teeth of the tooth plate, so that the movable plate can be conveniently controlled to move on the surface of the tooth plate, so as to conveniently control the leg support plate to lift the patient's legs.

[0010] Preferably, a plate cover is connected to the outer side of the bottom end of the support plate, and the plate cover is designed in a U-shaped structure. The plate cover covers the surface of the drive motor. The drive motor can be shielded by the plate cover, which is convenient for protecting the drive motor and gears and preventing debris or legs from directly touching the gears from the side.

[0011] Preferably, the inner wall of the rectangular block end of the movable plate is embedded with a ball through a ball groove, and the ball abuts against the inner wall of the guide groove of the tooth plate. When the rectangular block end of the movable plate moves in the guide groove on the side of the tooth plate, it can drive the ball to roll frictionally, thereby ensuring the smoothness of the movable plate when moving on the surface of the tooth plate.

[0012] Preferably, two limit plates are connected to the outer side of the movable plate, and a side hanging plate is mounted on the outer side of the limit plate. A leg support plate is connected to the outer side of the side hanging plate. The side hanging plate can be mounted on the surface of the limit plate in a side-sliding manner to facilitate assembly of the leg support plate. The leg support plate is designed to be inclined, which can conveniently support the patient's legs and prevent the legs from sliding sideways.

[0013] Preferably, the suspension assembly includes a lower pull ring connected and fixed to the movable plate, the top end of the lower pull ring is hooked and connected with a threaded suspension rod, and the axial end of the threaded suspension rod is threadedly sleeved with a threaded nut, two threaded nut are provided, the two threaded nut are connected and fixed by a suspension spring, the top end of the threaded nut is threadedly sleeved on the outer side of the axial end of the upper pull ring, the upper pull ring is hooked and docked with the fixed plate, the fixed plate is fixed to the outer side of the tooth plate by bolts, the suspension spring can provide pulling force to the movable plate, so that the movable plate can move up on the surface of the tooth plate conveniently, and the threaded nut moves on the surface of the threaded suspension rod, so as to change the overall tightness of the suspension spring.

[0014] The present invention has at least the following beneficial effects: 1. By setting up a frame group and a lifting component, the patient's legs can be lifted independently for exercise. Compared with the traditional structure, this device controls the rotation of the gear after the driving motor is powered on at the bedside. The gear and the teeth of the gear plate cooperate to control the movement of the movable plate on the surface of the tooth plate, so that the movable plate cooperates with the side hanging plate to drive the leg support plate to lift and move the patient's calf position, thereby ensuring the patient's leg exercise state, avoiding the patient's difficulty in independent exercise, and avoiding increasing the patient's physical burden.

[0015] 2. By setting up a frame group, the lifting angle of the patient's legs can be adjusted. The device rotates the threaded rod to control the slider to move in the guide groove at the top of the movable sleeve. The support rod pulls the tooth plate during movement to make the tooth plate rotate on the surface of the movable sleeve, thereby changing the position of the adjustment tooth plate. When the tooth plate is tilted, the movable plate moves on the surface of the tooth plate, which can control the oblique movement of the patient's legs for exercise, thereby ensuring the patient's leg exercise effect.

[0016] 3. By setting the plate group and the fixing assembly, the adaptability of the device installed on the bed is achieved. The device pulls the two sides of the straight plate through the movable sleeve to displace the card plate. At this time, the card plate is placed on the bottom end of the side of the bed board, and the threaded shaft knob is turned to move the threaded shaft in the threaded hole of the side plate sleeve. The threaded shaft can drive the card plate to be buckled on the bottom side of the bed board during movement, ensuring the convenience and adaptability of the device installation and meeting the installation requirements of different beds.

[0017] 4. By setting up a suspension component, the exercise needs of patients at different stages can be met. By connecting the pull-down ring at the top of the movable plate, a fixed plate is installed on the surface of the toothed plate, and the pull-down ring and the fixed plate are connected by a suspension spring. The movable plate can be suspended by the suspension spring. In the later stage, the patient can be placed on the surface of the leg support plate, and the leg support plate can be controlled to move downward by pressing down the patient's legs, which makes it convenient for the patient to exercise his legs and for the patient to perform independent exercise in the later stage of rehabilitation, thereby further meeting the patient's exercise needs. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 1 This is a schematic diagram of the external structure of a lower limb raising exerciser proposed by the present invention; Figure 2 This is a schematic diagram of the three-dimensional disassembled structure of a frame assembly of a lower limb raising exerciser proposed by the present invention; Figure 3 For the present invention Figure 2 A is a schematic diagram of the structure enlargement; Figure 4 It is a schematic diagram of the partial disassembled structure of a frame assembly of a lower limb raising exerciser proposed by the present invention; Figure 5 It is a three-dimensional disassembled structural schematic diagram of a fixing component in a lower limb raising exerciser proposed by the present invention; Figure 6 It is a three-dimensional disassembled structural schematic diagram of a lifting assembly in a lower limb lifting exerciser proposed by the present invention; Figure 7 The present invention provides a schematic diagram of the three-dimensional disassembled structure of a suspension assembly in a lower limb raising exerciser.

[0020] In the figure: 1. plate group; 11. straight plate; 12. movable sleeve plate; 13. reset spring; 2. fixing assembly; 21. side plate sleeve; 22. threaded rotary shaft; 23. clamping plate; 3. frame assembly; 31. plate frame; 32. plug plate; 33. beam plate; 34. tooth plate; 35. support rod; 36. slider; 37. threaded rotary rod; 4. lifting assembly; 41. movable plate; 42. support plate; 43. driving motor; 44. gear; 45. plate cover; 46. limit plate; 47. side hanging plate; 48. leg support plate; 49. ball; 5. suspension assembly; 51. lower pull ring; 52. threaded suspension rod; 53. threaded screw cap; 54. suspension spring; 55. upper pull ring; 56. fixing plate. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0022] Reference Figure 1-7A lower limb raising exerciser includes a plate group 1, which includes a straight plate 11, movable sleeve plates 12 are installed on both sides of the straight plate 11, a frame group 3 is arranged on the top of the straight plate 11, and the frame group 3 includes a beam plate 33, and plug plates 32 are connected to both sides of the bottom end of the beam plate 33, and the plug plates 32 are inserted into the plate frame 31 through slots, and the bottom end of the plate frame 31 is connected and fixed to the straight plate 11, and tooth plates 34 are movably installed on the left and right sides of the beam plate 33, and a lifting component 4 is movably installed on the outer side of the tooth plate 34, and a suspension component 5 is arranged on the top of the lifting component 4.

[0023] Reset springs 13 are connected to both ends of the straight plate 11, and the reset springs 13 are fixed to the inner wall of the movable sleeve plate 12. A fixing component 2 is arranged on the outer side of the movable sleeve plate 12. The fixing component 2 includes a side plate sleeve 21 fixed to the side of the movable sleeve plate 12. A threaded shaft 22 is inserted from top to bottom through a threaded hole at the top of the side plate sleeve 21, and a clamping plate 23 is movably installed at the bottom end of the threaded shaft 22.

[0024] A support rod 35 is movably installed on the outer side of the tooth plate 34, and a slider 36 is movably installed on the end of the support rod 35. The slider 36 is movably installed on the surface of the movable sleeve plate 12 through a guide groove. The slider 36 is threadedly sleeved on the surface of the threaded rotating rod 37, and one end of the threaded rotating rod 37 is rotatably installed on the inner wall of the guide groove of the movable sleeve plate 12.

[0025] The threaded rotating rod 37 is composed of a shaft end and a knob end, and a groove matching the knob end is formed on the surface of the movable sleeve plate 12 .

[0026] The lifting assembly 4 includes a movable plate 41, which is sleeved on the surface of the tooth plate 34. The movable plate 41 is in a U-shaped structure. A rectangular block end is provided on the inner side of the U-shaped edge of the movable plate 41, and the rectangular block end is embedded in the side of the tooth plate 34 through a guide groove. A support plate 42 is connected to the side of the movable plate 41, and a driving motor 43 is installed on the top of the support plate 42. A gear 44 is connected to the shaft end of the driving motor 43, and the gear 44 is meshed with the surface of the tooth plate 34 through teeth.

[0027] A plate cover 45 is connected to the outer side of the bottom end of the support plate 42 . The plate cover 45 is designed in a U-shaped structure and covers the surface of the driving motor 43 .

[0028] A ball 49 is embedded in the inner wall of the rectangular block end of the movable plate 41 through a ball groove, and the ball 49 abuts against the inner wall of the guide groove of the tooth plate 34 .

[0029] Two limit plates 46 are connected to the outer side of the movable plate 41 , and a side hanging plate 47 is sleeved and installed on the outer side of the limit plate 46 , and a leg support plate 48 is connected to the outer side of the side hanging plate 47 .

[0030] The suspension assembly 5 includes a lower pull ring 51 connected and fixed to the movable plate 41, and a threaded suspension rod 52 is hooked on the top of the lower pull ring 51, and a threaded screw cap 53 is threadedly sleeved on the axial end of the threaded suspension rod 52. Two threaded screw caps 53 are provided, and the two threaded screw caps 53 are connected and fixed by a suspension spring 54. The top threaded screw cap 53 is threadedly sleeved on the outer side of the axial end of the upper pull ring 55, and the upper pull ring 55 is hooked and docked with the fixed plate 56, and the fixed plate 56 is fixed to the outer side of the toothed plate 34 by bolts.

[0031] Under normal circumstances, under the elastic force of the return spring 13, the movable sleeve 12 is driven to move on the surface of the straight plate 11 and then buckled at both ends. The movable sleeve 12 can be freely pulled and moved, which is convenient for the two movable sleeves 12 to match with one straight plate 11 to adapt to the width of the bed. When the movable sleeve 12 is moved and adjusted, the threaded shaft 22 can be moved in the threaded hole of the side plate sleeve 21, so that the threaded shaft 22 can lift the clamping plate 23, and then control the clamping plate 23 to be buckled on the bottom side of the bed board, which is convenient for fixing the device, so that the exercise equipment can be adapted to the installation of different beds, and the adaptation effect of the device is improved. By rotating the threaded rotating rod 37, the external thread can be matched with the internal thread of the slider 36, so that the slider 36 can move in the guide groove on the surface of the movable sleeve 12, and then the tooth plate 34 can be pushed by the support rod 35 to change the inclination angle of the adjustment tooth plate 34.

[0032] By rotating the threaded rotating rod 37, the threaded rotating rod 37 controls the slider 36 to move in the guide groove at the top of the movable sleeve 12. The support rod 35 pulls the tooth plate 34 during movement, causing the tooth plate 34 to rotate on the surface of the movable sleeve 12, thereby changing the position of the tooth plate 34. When the tooth plate 34 is tilted, the movable plate 41 moves on the surface of the tooth plate 34, thereby controlling the oblique movement exercise of the patient's legs, thereby ensuring the patient's leg exercise effect.

[0033] By moving the movable plate 41 on the surface of the toothed plate 34, the patient's legs can be conveniently lifted and exercised at different angles, thereby improving the exercise effect on the patient's lower limbs. The slider 36 can be guided by the guide groove of the movable sleeve 12 to ensure the stability of the slider 36 when it moves left and right. The groove design on the surface of the movable sleeve 12 can facilitate the staff to twist the knob end of the threaded rotating rod 37 to ensure the convenience of moving the slider 36. The U-shaped structure design of the movable plate 41 can prevent the movable plate 41 from deviating when it moves on the surface of the toothed plate 34. The shaft end of the driving motor 43 drives the gear 44 to rotate, and the gear 44 can cooperate with the outer teeth of the toothed plate 34, and then the movable plate 41 can be conveniently controlled to move on the surface of the toothed plate 34, so that the leg support plate 48 can be conveniently controlled to lift the patient's legs. The rectangular block end of the movable plate 41 is displaced in the side guide groove of the toothed plate 34 to prevent the movable plate 41 from detaching from the surface of the toothed plate 34 during movement.

[0034] The plate cover 45 can shield the driving motor 43, which is convenient for protecting the driving motor 43 and the gear 44, and prevents debris or legs from directly touching the gear 44 from the side, which affects the safety of the patient's exercise. When the rectangular block end of the movable plate 41 moves in the side guide groove of the tooth plate 34, it can drive the ball 49 to roll frictionally, thereby ensuring the smoothness of the movable plate 41 when moving on the surface of the tooth plate 34, and avoiding obstacles in the movement of the movable plate 41. The side hanging plate 47 can be set on the surface of the limit plate 46 in a side-sliding manner, which is convenient for assembling the leg support plate 48. The leg support plate 48 is designed to be inclined, which is convenient for the patient's legs. The part is supported, and the limit plate 46 is designed in an L shape to ensure the stability of the side hanging plate 47 hanging on the side of the movable plate 41. A fixed plate 56 is connected to the outside of the tooth plate 34, and a lower pull ring 51 is arranged on the top of the movable plate 41. The threaded screw cap 53 is respectively connected with the axial end threads of the threaded suspension rod 52 and the upper pull ring 55. The movable plate 41 can be provided with a pulling force through the suspension spring 54, so that the movable plate 41 can be conveniently moved up on the surface of the tooth plate 34. The threaded screw cap 53 moves on the surface of the threaded suspension rod 52, which can change the overall tightness of the suspension spring 54. When the suspension spring 54 loses its elasticity, the suspension spring 54 can be conveniently replaced.

[0035] Working principle: According to the attached Figure 2 With attached Figure 5 As shown, during use, the movable cover plate 12 can be pulled so that the movable cover plate 12 stretches the return spring 13 while moving on the surface of the straight plate 11. When the movable cover plate 12 moves to a suitable position, the clamping plate 23 can be buckled on the side of the bed board. At this time, the threaded shaft 22 is rotated to move the threaded shaft 22 upward in the side plate cover 21, and then the clamping plate 23 is controlled to contact and be fixed at the bottom end of the bed board, thereby completing the assembly operation; Secondly, according to the attached Figure 2 With attached Figure 3 As shown, the threaded rod 37 is rotated, and the threaded rod 37 can control the slider 36 to move in the guide groove of the movable sleeve plate 12 during the rotation. The slider 36 pushes the support rod 35 during the movement, and the support rod 35 can push the tooth plate 34 to rotate, thereby changing the inclination angle of the tooth plate 34. When the adjustment is completed, according to the attached Figure 6 With attached Figure 7As shown, in the early stage of the patient's rehabilitation, the side hanging plates 47 can be slid from the side of the movable plate 41, and the side hanging plates 47 are moved and buckled on the outside of the limiting plate 46. After completion, the patient's legs are placed on the surface of the leg support plates 48, and the drive motor 43 can be powered on and started, so that the shaft end of the drive motor 43 drives the gear 44 to rotate, and the gear 44 can cooperate with the outer teeth of the tooth plate 34, and then control and drive the movable plate 41 to move on the surface of the tooth plate 34. During the movement of the movable plate 41, the side hanging plates 47 drive the leg support plates 48 to lift the legs. In the later stage of rehabilitation, the patient's legs can be placed on the leg support plates 48 for pressing down. The leg support plates 48 can cooperate with the side hanging plates 47 to drive the movable plate 41 to move downward on the surface of the tooth plate 34 while being pressed. During the movement of the movable plate 41, the suspension springs 54 can be stretched, thereby facilitating the exercise of the leg muscles.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A lower limb raising exerciser, comprising a plate set (1), characterized in that: The plate group (1) comprises a straight plate (11), movable sleeve plates (12) are sleeved and installed on both sides of the straight plate (11), a frame group (3) is arranged at the top of the straight plate (11), the frame group (3) comprises a beam plate (33), plug plates (32) are connected to both sides of the bottom end of the beam plate (33), and the plug plates (32) are inserted into the plate frame (31) through slots, the bottom end of the plate frame (31) is connected and fixed to the straight plate (11), tooth plates (34) are movably installed on both left and right sides of the beam plate (33), a lifting assembly (4) is movably installed on the outer side of the tooth plate (34), and a suspension assembly (5) is arranged at the top of the lifting assembly (4).

2. A lower limb raising exerciser according to claim 1, characterized in that: The two ends of the straight plate (11) are connected to return springs (13), and the return springs (13) are fixed to the inner wall of the movable sleeve plate (12). A fixing component (2) is arranged on the outer side of the movable sleeve plate (12), and the fixing component (2) comprises a side plate sleeve (21) fixed to the side of the movable sleeve plate (12). A threaded shaft (22) is inserted from top to bottom through a threaded hole at the top of the side plate sleeve (21), and a clamping plate (23) is movably installed at the bottom of the threaded shaft (22).

3. A lower limb raising exerciser according to claim 1, characterized in that: A support rod (35) is movably mounted on the outer side of the tooth plate (34), and a slider (36) is movably mounted on the end of the support rod (35). The slider (36) is movably mounted on the surface of the movable sleeve plate (12) through a guide groove. The slider (36) is threadedly sleeved on the surface of a threaded rotating rod (37), and one end of the threaded rotating rod (37) is rotatably mounted on the inner wall of the guide groove of the movable sleeve plate (12).

4. A lower limb raising exerciser according to claim 3, characterized in that: The threaded rotating rod (37) consists of a shaft end and a knob end, and a groove matching the knob end is formed on the surface of the movable sleeve plate (12).

5. The lower limb raising exerciser according to claim 1, characterized in that: The lifting assembly (4) comprises a movable plate (41), wherein the movable plate (41) is sleeved on the surface of the tooth plate (34), the movable plate (41) is in a U-shaped structure, a rectangular block end is arranged on the inner side of the U-shaped edge of the movable plate (41), and the rectangular block end is embedded in the side of the tooth plate (34) through a guide groove, the side of the movable plate (41) is connected to a support plate (42), and a driving motor (43) is installed on the top of the support plate (42), and a gear (44) is connected to the shaft end of the driving motor (43), and the gear (44) is meshed with the surface of the tooth plate (34) through teeth.

6. A lower limb raising exerciser according to claim 5, characterized in that: A plate cover (45) is connected to the outer side of the bottom end of the support plate (42); the plate cover (45) is designed in a U-shaped structure; and the plate cover (45) covers the surface of the drive motor (43).

7. The lower limb raising exerciser according to claim 5, characterized in that: A ball (49) is embedded in the inner wall of the rectangular block end of the movable plate (41) through a ball groove, and the ball (49) abuts against the inner wall of the guide groove of the tooth plate (34).

8. The lower limb raising exerciser according to claim 7, characterized in that: Two limit plates (46) are connected to the outside of the movable plate (41), and a side hanging plate (47) is sleeved and installed on the outside of the limit plate (46), and a leg support plate (48) is connected to the outside of the side hanging plate (47).

9. The lower limb raising exerciser according to claim 1, characterized in that: The suspension assembly (5) comprises a lower pull ring (51) connected and fixed to the movable plate (41); the top end of the lower pull ring (51) is hooked and connected to a threaded suspension rod (52); the axial end of the threaded suspension rod (52) is threadedly sleeved with a threaded screw cap (53); two threaded screw caps (53) are provided, and the two threaded screw caps (53) are connected and fixed via a suspension spring (54); the top end of the threaded screw cap (53) is threadedly sleeved on the outer side of the axial end of the upper pull ring (55); the upper pull ring (55) is hooked and docked with a fixed plate (56); and the fixed plate (56) is fixed to the outer side of the toothed plate (34) via bolts.

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