Postoperative nuchal muscle rehabilitation exercise device

Abstract

The utility model relates to a kind of postoperative nuchal muscle rehabilitation exercise device, belong to medical instrument technical field, solve the problem of complex structure, poor synchronism and directivity of traditional back muscle rehabilitation exercise device in prior art.The utility model includes drive unit, transmission unit, connecting unit, backplate and back muscle exercise frame;Transmission unit is set in the cavity formed by backplate;Back muscle exercise frame is symmetrically set in the two sides of backplate, and the side of back muscle exercise frame is hinged with the side of backplate;Transmission unit includes first gear and second gear, and second gear is engaged with first gear and is set in the upper and lower symmetry of first gear;Connecting unit is set in the opposite sides of transmission unit;One end of connecting unit is set in second gear, and the other end of connecting unit is set in back muscle exercise frame;The output shaft of drive unit is connected with first gear.The utility model structure is simple, and the synchronism and directivity of back muscle rehabilitation exercise device can be improved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a postoperative neck and back muscle rehabilitation exercise device. Background Technology

[0002] Postoperative neck and back muscle rehabilitation refers to the process by which patients gradually restore the strength, endurance, and function of their neck and back muscles through scientific and regular exercise after neck and back surgery. As key muscle groups that maintain spinal stability and support the weight of the upper body, the neck and back muscles are prone to muscle atrophy, decreased strength, and limited mobility if immobilized for extended periods due to surgical trauma. This not only affects patients' daily sitting and standing postures and limb mobility but may also lead to complications such as back pain and spinal deformities. Therefore, timely postoperative neck and back muscle rehabilitation exercises are crucial. The core goal is to activate muscle fibers and promote blood circulation through appropriate exercise, while avoiding secondary injury, to help patients gradually restore normal neck and back muscle function, improve their quality of life, and lay the foundation for returning to normal life and work.

[0003] Traditional postoperative neck and back muscle rehabilitation often relies on manual assistance or simple equipment, which has its drawbacks. Manual assistance requires the assistance of medical staff or family members to guide patients to complete movements such as raising their arms and expanding their chests. This not only consumes a lot of manpower but also makes it difficult to accurately control the intensity and frequency of the exercise. Excessive intensity can cause pain due to wound traction, while insufficient intensity can fail to achieve the desired rehabilitation effect. Simple equipment such as elastic bands and dumbbells can allow patients to exercise independently, but they lack targeted guidance structures. In the early postoperative period when muscle strength is weak, patients may have difficulty mastering the correct movement trajectory, easily leading to compensatory movements, resulting in poor exercise effects, or even increasing the burden on the back muscles, delaying the recovery process. Some patients may also suffer muscle strains due to improper operation, further affecting the efficiency of postoperative recovery. Utility Model Content

[0004] Based on the above analysis, the present invention aims to provide a postoperative neck and back muscle rehabilitation exercise device to solve the problems of complex structure, poor synchronization and guidance of traditional back muscle rehabilitation exercise devices.

[0005] The objective of this utility model is mainly achieved through the following technical solutions:

[0006] A postoperative neck and back muscle rehabilitation exercise device includes a drive unit, a transmission unit, a connecting unit, a back plate, and a back muscle exercise frame; the transmission unit is disposed in the cavity formed by the back plate; the back muscle exercise frame is symmetrically disposed on both sides of the back plate, and the side of the back muscle exercise frame is hinged to the side of the back plate.

[0007] The transmission unit includes a first gear and a second gear, wherein the second gear meshes with the first gear and is symmetrically arranged above and below the first gear;

[0008] The connecting unit is disposed on opposite sides of the transmission unit; one end of the connecting unit is disposed on the second gear, and the other end of the connecting unit is disposed on the back muscle exercise frame;

[0009] The output shaft of the drive unit is connected to the first gear. The drive unit is used to drive the connecting unit to extend and retract, and to cause the back muscle exercise frame to swing.

[0010] Furthermore, the back plate includes a base plate and a cover plate; the second gear has a rotating shaft disposed on the base plate, and the second gear rotates around the rotating shaft.

[0011] Furthermore, the connecting unit includes an eccentric column, which is disposed on the edge of the second gear and rotates with the second gear.

[0012] Furthermore, the connecting unit also includes a guide component, which is disposed inside the second gear. The guide component has a guide groove inside, and the eccentric column is located in the guide groove and is tangentially engaged with the guide groove.

[0013] Furthermore, the connecting unit also includes a drive rod, which is horizontally disposed on both sides of the guide component; the drive rod is integrally formed with the guide component.

[0014] Furthermore, one end of the drive rod is provided with an elongated through hole, and a support column is provided inside the elongated through hole;

[0015] The connecting unit further includes a connecting rod; one end of the connecting rod is sleeved on the support column, and the other end of the connecting rod is hinged to the back muscle exercise frame.

[0016] Furthermore, the connecting unit also includes a first guide groove and a second guide groove; the first guide groove is disposed on the inner side of the base plate, and the second guide groove is disposed on the edge of the base plate; the first guide groove and the second guide groove are used to accommodate the drive rod and guide the drive rod.

[0017] Furthermore, a fixing strip is provided on the back muscle exercise frame, and the end of the connecting rod is hinged to the fixing strip.

[0018] Furthermore, the side of the backplate that fits against the back of the human body is curved.

[0019] Furthermore, the back panel also includes a cover plate, and a storage basket is provided on the outside of the cover plate, with the drive unit disposed inside the storage basket.

[0020] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0021] (1) This utility model uses the meshing of the first gear and the second gear, the connecting unit connects the second gear and the back muscle exercise frame, the driving unit drives the connecting unit to move, and drives the back muscle exercise frame to move, so as to realize back muscle exercise. By utilizing the strong synchronicity of gear transmission, the back muscle exercise frames on both sides move synchronously, the movements are highly coordinated, the guidance and motion accuracy are improved, and the whole device has a compact structure. The whole device is driven by the driving unit, which does not require the patient to exert force manually, reducing the muscle burden in the early postoperative period, and is especially suitable for patients with weak muscle strength.

[0022] (2) The present invention provides an eccentric column on the edge of the second gear. The eccentric column is located in the guide groove of the vertically arranged guide component. At the same time, the guide groove is set on the drive rod that can move horizontally. The eccentric column moves in the guide groove while the second gear rotates. The tangential cooperation between the eccentric column and the guide groove drives the drive rod to move horizontally. The rotational motion of the second gear is converted into the horizontal reciprocating linear motion of the drive rod through the constraint motion of the eccentric column in the guide groove. The structure is simple, compact and has high conversion efficiency.

[0023] (3) In this utility model, the support column connects the drive rod and the connecting rod, and the connecting rod connects to the back muscle exercise frame. The horizontal reciprocating motion of the drive rod is transmitted to the connecting rod and the back muscle exercise frame, which is converted into the contraction and expansion motion of the back muscle exercise frame. This is direct and efficient, the motion trajectory is controllable, the training efficiency is improved, and the structure is stable. The cooperation between the eccentric column of the second gear and the guide component, combined with the reverse symmetrically distributed drive rods, can drive the back muscle exercise frames at both ends to achieve automated and regular reciprocating swing through the drive connecting rod. This can provide uniform and continuous exercise for the neck and back muscles and promote muscle function recovery.

[0024] (4) The back muscle exercise frame and the fixing strip form a back muscle extension area, which makes it easy for the patient to bend their arm and extend it. The operation is simple, and the drive rod is guided by the guide groove to ensure the stability of the movement trajectory and avoid the impact of movement deviation on the rehabilitation effect. Overall, it helps the patient to safely and efficiently restore the neck and back muscle function after surgery.

[0025] (5) This utility model utilizes the arc shape of the front end of the back plate to fit the back of the human body closely, and with the stable support frame at the bottom, it not only ensures the stability of the device, but also improves the comfort and body fit of the patient when using it, and avoids discomfort caused by poor fit of the device during the rehabilitation process.

[0026] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages will become apparent from the description or be learned by practicing this invention. The objectives and other advantages of this invention can be realized and obtained from the details specifically pointed out in the text and accompanying drawings. Attached Figure Description

[0027] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0028] Figure 1 A schematic diagram of the outer structure of the postoperative neck and back muscle rehabilitation exercise device;

[0029] Figure 2 A schematic diagram of the inner structure of a postoperative neck and back muscle rehabilitation exercise device;

[0030] Figure 3 A schematic diagram of the internal structure of the backplate cavity;

[0031] Figure 4 A schematic diagram showing the connection between the transmission unit, the connecting unit, and the back muscle exercise frame;

[0032] Figure 5 This is a schematic diagram of the structure inside the bottom plate of the back panel.

[0033] Figure label:

[0034] 1-Support frame; 2-Back panel; 21-Cover plate; 211-Storage basket; 22-Base plate; 3-Transmission unit; 31-First gear; 32-Second gear; 321-Rotating shaft; 4-Connecting unit; 41-Eccentric column; 42-Drive rod; 421-Elongated through hole; 422-Support column; 43-Guide component; 431-Guide groove; 44-First guide groove; 45-Second guide groove; 46-Connecting rod; 5-Back muscle exercise frame; 51-Fixing strip; 6-Drive unit. Detailed Implementation

[0035] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0036] A specific embodiment of this utility model is as follows: Figure 1 , Figure 3 and Figure 4 As shown, a postoperative neck and back muscle rehabilitation exercise device is disclosed, including a back plate 2, a transmission unit 3, a connecting unit 4, a back muscle exercise frame 5, and a drive unit 6; the transmission unit 3 is disposed in the cavity formed by the back plate 2; the back muscle exercise frame 5 is symmetrically disposed on both sides of the back plate 2, and the side of the back muscle exercise frame 5 is hinged to the side of the back plate 2.

[0037] The transmission unit 3 includes a first gear 31 and a second gear 32. The second gear 32 meshes with the first gear 31 and is symmetrically arranged above and below the first gear 31.

[0038] The connecting unit 4 is located on opposite sides of the transmission unit 3; one end of the connecting unit 4 is located on the second gear 32, and the other end of the connecting unit 4 is located on the back muscle exercise frame 5.

[0039] The output shaft of the drive unit 6 is connected to the first gear 31. The drive unit 6 is used to drive the extension and retraction of the connecting unit 4 and to drive the back muscle exercise frame 5 to swing.

[0040] In this embodiment, the first gear 31 and the second gear 32 mesh, the connecting unit 4 connects the second gear 32 and the back muscle exercise frame 5, and the driving unit 6 drives the connecting unit 4 to move, thereby moving the back muscle exercise frame 5 to achieve back muscle exercise. Utilizing the strong synchronicity of gear transmission, the back muscle exercise frames 5 on both sides move synchronously, resulting in highly coordinated movements, improved guidance and motion accuracy and reliability, and a compact overall structure. The entire device is driven by the driving unit 6, eliminating the need for manual force from the patient, reducing muscle burden in the early postoperative period, and is especially suitable for patients with weak muscle strength.

[0041] Specifically, such as Figure 1 As shown, the device includes a support frame 1, which supports other parts of the device.

[0042] The back plate 2 is located on the upper part of the support frame 1. For example... Figure 2 As shown, the backplate 2 includes a base plate 22 and a cover plate 21, which form a cavity. The side of the base plate 22 is designed to fit against the back of the human body, and for ergonomic design purposes, the surface that fits against the back of the human body is curved. Exemplarily, the base plate 22 and the cover plate 21 are welded together. This embodiment utilizes the curved shape of the front end of the backplate 2 to fit tightly against the back of the human body, and with the stable support frame at the bottom, it ensures the stability of the device, improves the comfort and body fit of the patient during use, and avoids discomfort caused by poor device fit during rehabilitation.

[0043] like Figure 3 As shown, the transmission unit 3 is disposed within the cavity formed by the base plate 22 and the cover plate 21. Exemplarily, the transmission unit 3 includes a first gear 31 and a second gear 32.

[0044] The first gear 31 is located at the center of the base plate 22, and the second gear 32 meshes with the first gear 31 and is symmetrically arranged above and below the first gear 31. The rotation of the first gear 31 drives the upper and lower second gears 32 to rotate in two opposite directions.

[0045] A rotating shaft 321 is provided on the base plate 22, and the second gear 32 is sleeved on the rotating shaft 321 and rotates with the rotating shaft 321.

[0046] like Figure 4As shown, the connecting unit 4 is used to connect the transmission unit 2 and the back muscle exercise frame 5. The connecting unit 4 includes an eccentric column 41, which is disposed on the inner edge of the second gear 32 and rotates with the second gear 32.

[0047] The connecting unit 4 also includes a drive rod 42 and a guide component 43. For example... Figure 5 As shown, a first guide groove 44 and a second guide groove 45 are provided on the base plate 22. The first guide groove 44 is located on the inner side of the base plate 22 and is symmetrically arranged on both sides of the rotating shaft 321. The second guide groove 45 is located on the edge of the base plate 22. The centers of the first guide groove 44 and the second guide groove 45 are at the same height as the center of the rotating shaft 321. The first guide groove 44 and the second guide groove 45 are used to accommodate the drive rod 42 and guide the drive rod 42.

[0048] The drive rod 42 is disposed within the first guide groove 44 and the second guide groove 45, and is capable of horizontal movement within the first guide groove 44 and the second guide groove 45. One end of the drive rod 42 is located within the cavity of the back plate 2, and the other end extends out of the back plate 2 through the second guide groove 45. The first guide groove 44 and the second guide groove 45 provide a path for the drive rod 42 to exit the back plate 2, ensuring smooth movement of the component.

[0049] The guide component 43 is vertically mounted on the drive rod 42 and fixedly connected to it. The guide component 43 has a guide groove 431 inside, and the eccentric column 41 is located within the guide groove 431. During the movement of the eccentric column 41, it is tangentially engaged with the guide groove 431. When the eccentric column 41 rotates with the second gear 32, the guide component 43 moves horizontally, driving the drive rod 42 to move horizontally. Thus, the rotation of the second gear 32 is converted into the horizontal movement of the drive rod 42.

[0050] In this embodiment, the second gears 32 are symmetrically arranged above and below the first gears 31, and the eccentric column 41 is arranged on the two second gears 32. The guide component 43 and the drive rod 42 are correspondingly arranged in twos. The guide component 43 has an eccentric column 41 arranged on the edge of the second gear 32, and the eccentric column 41 rotates with the second gear 32.

[0051] When the eccentric column 41 is located at the center line of the drive rod 42, its horizontal displacement from the center of the second gear 32 is at its maximum, and the guide component 43 and the drive rod 42 are at their maximum horizontal displacement to the right. From this position, the eccentric column 41 rotates upwards or downwards, and within the guide groove 432 of the guide component 43, it is positioned above or below the center line of the drive rod 42. The horizontal displacement of the eccentric column 41 from the center of the second gear 32 decreases, and the guide components 43 on both sides and the drive rod 42 move towards each other. At this time, the length of the drive rod 42 extending beyond the back plate 2 decreases. When the eccentric column 41 moves from its upper or lower position to a position aligned with the drive rod, its horizontal displacement from the center of the second gear 32 decreases, and the guide components 43 on both sides and the drive rod 42 move in opposite directions. At this time, the length of the drive rod 42 extending beyond the back plate 2 increases.

[0052] In this embodiment, an eccentric column 41 is provided on the edge of the second gear 32. The eccentric column 41 is located in the guide groove 431 of the vertically arranged guide component 43. At the same time, the guide groove 431 is provided on the drive rod 42 that can move horizontally. The eccentric column 41 moves in the guide groove 431 while the second gear 32 rotates, driving the drive rod 42 to move horizontally. The rotational motion of the second gear 32 is converted into the horizontal reciprocating linear motion of the drive rod 42 by the constraint motion of the eccentric column 41 in the guide groove 431. The structure is simple and compact, and the conversion efficiency is high.

[0053] Furthermore, one end of the drive rod 42 is provided with an elongated through hole 421. For example... Figure 3 As shown, a support column 422 is vertically installed inside the elongated through hole 421.

[0054] like Figure 4 As shown, the connecting unit 4 also includes a connecting rod 46. One end of the connecting rod 46 is sleeved on the support column 422, and the other end of the connecting rod 46 is hinged to the back muscle exercise frame 5. The end of the connecting rod 46 can move in the elongated through hole 421. When the driving rod 42 moves horizontally, the support column 422 drives the end of the connecting rod 46 to move horizontally, thereby causing the other end of the connecting rod 46 to swing the back muscle exercise frame 5.

[0055] The back muscle training frame 5 is symmetrically arranged on both sides of the back plate 2, and the side of the back muscle training frame 5 is hinged to the side of the back plate 2. A fixing strip 51 is provided on the back muscle training frame 5. Exemplarily, in this embodiment, the fixing strip 51 is vertically arranged, and the end of the connecting rod 46 is hinged to the fixing strip 51. The two ends of the guide component 43 are respectively connected to fixing strips 51 of different lengths. The length of the fixing strip 13 at the right end of the guide component 43 is greater than the length of the fixing strip 51 at the left end. Through the tangential engagement between the eccentric column 41 on the second gear 32 and the guide component 43, the rotation of the gear is converted into the sliding power of the guide component 43, and the difference in the length of the fixing strips 51 provides adaptability for subsequent connections.

[0056] The back muscle exercise frame 5 and the fixing strip 51 form a back muscle extension area, which makes it easy for the patient to bend their arm and extend it. The operation is simple. The drive rod 42 is guided by the first guide groove 44 and the second guide groove 45 to ensure the stability of the movement trajectory and avoid the impact of movement deviation on the rehabilitation effect. Overall, it helps the patient to safely and efficiently recover the neck and back muscle function after surgery.

[0057] In this embodiment, the back muscle training frame 5 is hinged to the connecting rod 46, with one end connected to the end of the drive rod 42. When the two drive rods 42 move in opposite directions, and the length of the drive rods 42 extending beyond the back plate 2 increases, the hinged end of the connecting rod 46 drives the back muscle training frame 5 to swing towards one side of the back plate 2, causing the person's arm to retract inward. When the drive rods 42 move towards each other, and the length of the drive rods 42 extending beyond the back plate 2 decreases, the hinged end of the connecting rod 46 drives the back muscle training frame 5 to swing away from the back plate 2, causing the person's arm to extend outward. The cooperation between the eccentric column 41 of the second gear 32 and the guide component 43, combined with the symmetrically distributed drive rods 42, can drive the back muscle training frames 5 at both ends to achieve automated and regular reciprocating swing through the drive connecting rod 46, which can provide uniform and continuous exercise for the neck and back muscles and promote muscle function recovery.

[0058] In this embodiment, the support column 422 connects the drive rod 42 and the connecting rod 46. The connecting rod 46 connects to the back muscle training frame 5, transmitting the horizontal reciprocating motion of the drive rod 42 to the connecting rod 46 and the back muscle training frame 5, which is then converted into the contraction and expansion motion of the back muscle training frame 5. This is direct and efficient, with controllable motion trajectory, improving training efficiency, and the structure is stable.

[0059] The output shaft of the drive unit 6 is connected to the rotation shaft of the first gear 31, and the drive unit 6 drives the first gear 31 to rotate. Exemplarily, in this embodiment, the drive unit 6 is a motor, and a storage basket 211 is provided on the outer side of the cover plate 21, with the motor disposed within the storage basket 211. The output shaft of the motor passes through the cover plate 21 and connects to the rotation shaft of the first gear 31, transmitting power to the first gear 31.

[0060] The drive unit 6 is equipped with a controller for controlling the drive unit 6. Since the controller is prior art in this field, it will not be described in detail here.

[0061] The usage method of this embodiment is as follows:

[0062] The controller starts the motor, which drives the first gear 31 to rotate clockwise. The first gear 31 drives the meshing second gear 32 to rotate. The up-and-down movement of the eccentric column 41 on the second gear 32 causes the guide component 43 and the drive rod 42 to move horizontally in opposite directions, increasing the length of the two drive rods 42 extending outside the back plate 2. The end support column 422 of the drive rod 42 causes the end of the connecting rod 46 to move horizontally outward, and drives the other end of the connecting rod 46 to swing, causing the back muscle exercise frame 5 to swing inward, thus retracting the human arm inward.

[0063] The controller starts the motor, which drives the first gear 31 to rotate counterclockwise. The first gear 31 drives the meshing second gear 32 to rotate. The up-and-down movement of the eccentric column 41 on the second gear 32 causes the guide component 43 and the drive rod 42 to move horizontally towards each other, reducing the length of the two drive rods 42 extending outside the back plate 2. The end support column 422 of the drive rod 42 causes the end of the connecting rod 46 to move horizontally inward, and drives the other end of the connecting rod 46 to swing, causing the back muscle exercise frame 5 to swing outward, thus expanding the human arm outward.

[0064] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A postoperative neck and back muscle rehabilitation exercise device, characterized in that, It includes a back plate (2), a transmission unit (3), a connecting unit (4), a back muscle exercise frame (5), and a drive unit (6); the transmission unit (3) is disposed in the cavity formed by the back plate (2); the back muscle exercise frame (5) is symmetrically disposed on both sides of the back plate (2), and the side of the back muscle exercise frame (5) is hinged to the side of the back plate (2); The transmission unit (3) includes a first gear (31) and a second gear (32), wherein the second gear (32) meshes with the first gear (31) and is symmetrically arranged above and below the first gear (31); The connecting unit (4) is disposed on opposite sides of the transmission unit (3); one end of the connecting unit (4) is disposed on the second gear (32), and the other end of the connecting unit (4) is disposed on the back muscle exercise frame (5). The output shaft of the drive unit (6) is connected to the first gear (31). The drive unit (6) is used to drive the connecting unit (4) to extend and retract, and to drive the back muscle exercise frame (5) to swing.

2. The postoperative neck and back muscle rehabilitation exercise device according to claim 1, characterized in that, The back plate (2) includes a base plate (22); the second gear (32) has a rotating shaft (321) which is disposed on the base plate (22), and the second gear (32) rotates around the rotating shaft (321).

3. The postoperative neck and back muscle rehabilitation exercise device according to claim 2, characterized in that, The connecting unit (4) includes an eccentric column (41) disposed on the edge of the second gear (32), and the eccentric column (41) rotates with the second gear (32).

4. The postoperative neck and back muscle rehabilitation exercise device according to claim 3, characterized in that, The connecting unit (4) further includes a guide component (43), which is disposed inside the second gear (32). The guide component (43) has a guide groove (431) inside it. The eccentric column (41) is located inside the guide groove (431) and is tangentially engaged with the guide groove (431).

5. The postoperative neck and back muscle rehabilitation exercise device according to claim 4, characterized in that, The connecting unit (4) further includes a drive rod (42), which is horizontally arranged on both sides of the guide component (43); the drive rod (42) and the guide component (43) are integrally formed.

6. The postoperative neck and back muscle rehabilitation exercise device according to claim 5, characterized in that, One end of the drive rod (42) is provided with an elongated through hole (421), and a support column (422) is provided inside the elongated through hole (421). The connecting unit (4) further includes a connecting rod (46); one end of the connecting rod (46) is sleeved on the support column (422), and the other end of the connecting rod (46) is hinged to the back muscle exercise frame (5).

7. The postoperative neck and back muscle rehabilitation exercise device according to claim 5, characterized in that, The connecting unit (4) further includes a first guide groove (44) and a second guide groove (45); the first guide groove (44) is disposed on the inner side of the base plate (22), and the second guide groove (45) is disposed on the edge of the base plate (22); the first guide groove (44) and the second guide groove (45) are used to accommodate the drive rod (42) and guide the drive rod (42).

8. The postoperative neck and back muscle rehabilitation exercise device according to claim 6, characterized in that, The back muscle exercise frame (5) is provided with a fixing strip (51), and the end of the connecting rod (46) is hinged to the fixing strip (51).

9. The postoperative neck and back muscle rehabilitation exercise device according to any one of claims 1-8, characterized in that, The back panel (2) has an arc-shaped side that fits against the back of the human body.

10. The postoperative neck and back muscle rehabilitation exercise device according to claim 9, characterized in that, The back panel (2) also includes a cover plate (21), and a storage basket (211) is provided on the outside of the cover plate (21), and the drive unit (6) is located inside the storage basket (211).

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