A rotational bias drive mechanism

Abstract

The present invention provides a rotational offset drive mechanism, comprising a fixed frame and a rotating frame with surfaces parallel to each other, the fixed frame being fixedly provided with a supporting component and a driving component respectively connected to the rotating frame, the rotating frame being able to freely rotate in a plane relative to the supporting component and the driving component respectively, the driving component comprising a driving shaft cooperating with the rotating frame, the driving shaft being able to change position in the rotating plane of the rotating frame under the action of the driving component, and the driving component being able to lock the position of the driving shaft. The advantages of the present invention are: providing two rotation centers for the rotating frame, changing the position of one of the driving shafts by the driving component, so that the rotating frame rotates in a plane relative to the supporting component, overcoming the influence of the eccentric force on the life of the rotating shaft in the case of a single rotating shaft, improving stability and service life, the driving shaft can be fixed at any position within the range of motion, ensuring that the rotating frame will not shake during use, and improving safety.

Description

Technical Field

[0001] The present invention relates to the technical field of rotary drive mechanisms, and in particular to a rotary bias drive mechanism. Background Art

[0002] With the increase of the aging population, there are more and more people with limited mobility. Many patients can only stay in bed for a long time. When caring for this kind of people, sometimes it is necessary to rotate the patient relative to the bed appropriately to facilitate getting in and out of bed, body care and other tasks; the existing equipment mostly adopts a motor direct drive structure, or the motor, reducer and shaft adopt a series structure, which occupies a large space in the axial direction and requires a large installation space. Some equipment uses a shaft and a reducer in series, and the input shaft of the reducer and the motor are driven by a synchronous belt drive, and the central axis of the shaft is the input point of the maximum torque position. In order to meet the torque requirements, a larger reducer is required, which undoubtedly increases the cost. The large torque reducer is also large in size and requires a larger installation space.

[0003] The utility model patent with publication number CN208741347U discloses a bed board rotating mechanism for a nursing bed, in which a telescopic driving mechanism is hingedly matched with a first connecting rod connected to a driving shaft, and the first hinged rod is driven to rotate in a plane through the telescopic movement of the telescopic driving mechanism, thereby rotating the driving shaft, and then driving the bed board to rotate. Its structural composition is relatively complex. The telescopic driving mechanism generally requires an external compressor or air pump to work, and the noise is relatively large. In addition, both ends of the telescopic driving mechanism are hingedly arranged, and the stability is poor. The bed board and the supporting structure are supported and matched only by the driving shaft. When the bed board rotates, the driving shaft is easily affected by eccentric force, which affects the service life. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a rotation offset drive mechanism which uses an offset structure to drive the movement of the bed board and can be locked during rotation, in view of the problems that the existing technology requires a large installation space and the rotating shaft is easily affected by eccentric force.

[0005] The present invention solves the above technical problems through the following technical solutions: a rotational offset drive mechanism, comprising a fixed frame and a rotating frame whose surfaces are parallel to each other, the fixed frame is fixedly provided with a supporting component and a driving component respectively connected to the rotating frame, the rotating frame can rotate freely in a plane relative to the supporting component and the driving component respectively, the driving component comprises a driving shaft cooperating with the rotating frame, the driving shaft can change its position in the rotation plane of the rotating frame under the action of the driving component, and the driving component can lock the position of the driving shaft.

[0006] The present invention provides two rotation centers for the rotating frame, and changes the position of one of the driving shafts by a driving component, so that the rotating frame rotates relative to the supporting component in a plane, thereby overcoming the influence of eccentric force on the life of the rotating shaft in the case of a single rotating shaft, improving stability and service life, and the driving shaft can be fixed at any position within the range of motion, ensuring that the rotating frame will not shake during use, thereby improving safety.

[0007] Preferably, the driving component also includes a motor fixed on the fixed frame, the output shaft of the motor is connected to the screw rod, a first slide is threadedly provided on the screw rod, a second guide rod perpendicular to the screw rod is provided on the first slide, both ends of the second guide rod are fixedly connected to the second slide, and the driving shaft is fixed on the second slide.

[0008] Preferably, the length direction of the screw rod is perpendicular to the length direction of the fixing frame.

[0009] Preferably, at least one first guide rod parallel to the screw rod is fixedly arranged on the fixing frame, and the first guide rod is slidably matched with the first sliding seat.

[0010] Preferably, linear bearings are respectively provided on the first slide seat and the second slide seat.

[0011] Preferably, a guide wheel is coaxially fixedly provided at one end of the screw rod, and the guide wheel is transmission-coordinated with the output end of the motor via a belt.

[0012] Preferably, a screw seat fixedly matched with a fixing frame is respectively provided at both ends of the screw rod, the screw rod and the screw seat are freely matched along the circumferential direction, and the guide wheel is located on the outside of one of the screw seats.

[0013] Preferably, a nut is threadedly provided on the screw rod, and the first sliding seat is fixedly matched with the nut.

[0014] Preferably, the support component includes a support bearing and a support shaft, the outer ring of the support bearing is fixedly matched with the fixed frame, the inner ring of the support bearing is fixedly matched with the support shaft, and the support shaft is fixedly matched with the rotating frame.

[0015] Preferably, a plurality of fixing holes are arranged on the surface of the support shaft along the circumferential direction, the axial direction of the fixing holes is parallel to the axial direction of the support shaft, and the rotating frame is screwed and fixed to the support shaft through the fixing holes.

[0016] The advantages of a selective offset drive mechanism provided by the present invention are: providing two rotation centers for the rotating frame, changing the position of one of the drive shafts by the driving component, so that the rotating frame rotates relative to the supporting component in the plane, thereby overcoming the influence of eccentric force on the life of the rotating shaft in the case of a single rotating shaft, improving stability and service life, and the drive shaft can be fixed at any position within the range of motion to ensure that the rotating frame will not shake during use, thereby improving safety. By changing the position of the drive shaft by the screw rod, the position of the drive shaft can be conveniently locked by the thread to ensure the stability of the rotating frame; the motor transmits power through the belt, reducing the axial installation distance, and does not require a large torque reducer to transmit, reducing costs and the demand for installation space. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of a rotary bias drive mechanism provided by an embodiment of the present invention;

[0018] Figure 2 A bottom view schematic diagram of a rotary bias drive mechanism provided by an embodiment of the present invention;

[0019] Figure 3 A schematic diagram of a driving component of a rotary bias driving mechanism provided in an embodiment of the present invention;

[0020] Figure 4 A schematic diagram of driving away the rotation bias driving mechanism provided by an embodiment of the present invention;

[0021] Figure 5 A schematic diagram of a support component of a rotary bias drive mechanism provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the technical solution of the present invention is clearly and completely described below in combination with specific embodiments and with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] like Figure 1As shown, this embodiment provides a rotational bias driving mechanism, including a fixed frame 1 and a rotating frame 2 whose surfaces are parallel to each other, the fixed frame 1 is fixedly provided with a supporting component 3 and a driving component 4 respectively connected to the rotating frame 2, the rotating frame 2 can rotate freely in a plane relative to the supporting component 3 and the driving component 4 respectively, the driving component 4 includes a driving shaft 41 matched with the rotating frame 2, the driving shaft 41 can change its position in the rotation plane of the rotating frame 2 under the action of the driving component 4, and the driving component 4 can lock the position of the driving shaft 41.

[0024] This embodiment provides two rotation centers for the rotating frame 2, and changes the position of one of the driving shafts 41 by the driving component 4, so that the rotating frame 2 rotates relative to the supporting component 3 in the plane, thereby overcoming the influence of the eccentric force on the life of the rotating shaft in the case of a single rotating shaft, improving the stability and service life, and the driving shaft 41 can be fixed at any position within the range of motion to ensure that the rotating frame 2 will not shake during use, thereby improving safety.

[0025] Combination Figure 2 and Figure 3 The driving component 4 also includes a motor 42 fixed on the fixed frame 1, and the output end of the motor 42 is connected to the screw rod 43 for transmission. A first slide 44 is screwed on the screw rod 43, and a second guide rod 45 perpendicular to the screw rod 43 is provided on the first slide 44. Both ends of the second guide rod 45 are fixedly connected to the second slide 46, and the driving shaft 41 is fixed on the second slide 46.

[0026] refer to Figure 4 The motor 42 drives the screw rod 43 to rotate, so that the first slide 44 on the screw rod 43 changes its position along the length direction of the screw rod 43. Since the distance between the driving shaft 41 and the supporting component 3 remains unchanged, when the first slide 44 moves along the length direction of the screw rod 43, the second slide 46 needs to slide and change its position along the second guide rod 45 to balance the position change brought by the first slide 44, so that the driving shaft 41 can move longitudinally and transversely in the plane at the same time, and finally the rotating frame 2 is driven to rotate relative to the supporting component 3 in the plane through the movement of the driving shaft 41.

[0027] Refer to Figure 3The length direction of the screw rod 43 is perpendicular to the length direction of the fixing frame 1. The fixing frame 1 is also fixedly provided with at least one first guide rod 431 parallel to the screw rod 43. The first guide rod 431 is slidably matched with the first slide 44, thereby ensuring that the first slide 44 will not rotate under the rotation of the screw rod 43. The first slide 44 and the second slide 46 are respectively provided with linear bearings (not shown in the figure), and the first guide rod 431 and the second guide rod 45 are respectively matched with the linear bearings. A nut (not shown in the figure) is threadedly provided on the screw rod 43, and the first slide 44 is fixedly matched with the nut, so that the position of the first slide 44 is adjusted by the rotation of the screw rod 42.

[0028] In order to reduce the axial installation space, the screw rod 43 and the motor 42 are matched through the belt 421. Specifically, a guide wheel 432 is coaxially fixedly provided at one end of the screw rod 43, and the guide wheel 432 is matched with the output end of the motor 42 through the belt 421; the motor 42 is fixedly installed on the fixed frame 1 through the motor mounting seat 422. A screw rod seat 433 fixedly matched with the fixed frame 1 is respectively provided at both ends of the screw rod 43. The screw rod 43 and the screw rod seat 433 are freely matched along the circumferential direction, and can be connected by a bearing or other structure. One end of the screw rod 43 passes through the screw rod seat 433 to connect the guide wheel 432. Both ends of the first guide rod 431 are also fixed on the screw rod seat 433, and the first guide rod 431 can be fixedly or rotationally matched with the screw rod seat 433.

[0029] The rotating frame 2 will rotate relative to the second slide seat 46 when rotating. When setting, the rotating frame 2 can be freely matched with the driving shaft 41 in the circumferential direction, the driving shaft 41 can be freely matched with the second slide seat 46 in the circumferential direction, and the two ends of the driving shaft 41 can be freely fixed in the circumferential direction respectively, and bearings can be used for connection.

[0030] Combination Figure 1 and Figure 5 The support component 3 includes a support bearing 31 and a support shaft 32. The outer ring of the support bearing 31 is fixedly matched with the fixed frame 1 by welding or screwing. The inner ring of the support bearing 31 is fixedly matched with the support shaft 32. The support shaft 32 is fixedly matched with the rotating frame 2. Specifically, a plurality of fixing holes 33 are circumferentially arranged at the end of the support shaft 32. The axial direction of the fixing hole 33 is parallel to the axial direction of the support shaft 32. The rotating frame 2 is screwed and fixed to the support shaft 32 through the fixing hole 33.

[0031] If the fixed frame 1 and the rotating frame 2 are at the same height, the support bearing 31 can be screwed to the fixed frame 1 using bolts in the same way, so that the support bearing 31 is offset from the surface of the fixed frame 1, thereby leaving enough axial space for installing the rotating frame 2 in the fixed frame 1.

[0032] When used for patient care, the fixed frame 1 and the rotating frame 2 can be set as a bed board structure, but the use scenario of the rotational offset drive mechanism provided in this embodiment is not limited to a nursing bed, and those skilled in the art can adaptively set the specific structure of the fixed frame 1 and the rotating frame 2 according to needs.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rotational bias drive mechanism, characterized in that: The invention comprises a fixed frame and a rotating frame whose surfaces are parallel to each other, the fixed frame is fixedly provided with a supporting component and a driving component respectively connected to the rotating frame, the rotating frame can rotate freely in a plane relative to the supporting component and the driving component respectively, the driving component comprises a driving shaft matched with the rotating frame, the driving shaft can change position in the rotating plane of the rotating frame under the action of the driving component, and the driving component can lock the position of the driving shaft; The driving component also includes a motor fixed on the fixed frame, the output shaft of the motor is connected to the screw rod, the screw rod is threaded with a first slide seat, the first slide seat is provided with a second guide rod perpendicular to the screw rod, the two ends of the second guide rod are fixedly connected to the second slide seat, and the driving shaft is fixed on the second slide seat; the length direction of the screw rod is perpendicular to the length direction of the fixed frame; at least one first guide rod parallel to the screw rod is also fixedly provided on the fixed frame, and the first guide rod is slidably matched with the first slide seat; The support component includes a support bearing and a support shaft. The outer ring of the support bearing is fixedly matched with the fixed frame, the inner ring of the support bearing is fixedly matched with the support shaft, and the support shaft is fixedly matched with the rotating frame.

2. A rotational bias drive mechanism according to claim 1, characterized in that: The first slide seat and the second slide seat are respectively provided with linear bearings.

3. A rotational bias drive mechanism according to claim 1, characterized in that: A guide wheel is coaxially fixedly arranged at one end of the screw rod, and the guide wheel is transmission-matched with the output end of the motor through a belt.

4. A rotational bias drive mechanism according to claim 3, characterized in that: A screw seat fixedly matched with the fixing frame is respectively arranged at both ends of the screw rod, the screw rod and the screw seat are freely matched along the circumferential direction, and the guide wheel is located on the outside of one of the screw rod seats.

5. A rotational bias drive mechanism according to claim 1, characterized in that: A nut is threadedly provided on the screw rod, and the first sliding seat is fixedly matched with the nut.

6. A rotational bias drive mechanism according to claim 1, characterized in that: The end of the support shaft is provided with a plurality of fixing holes along the circumferential direction. The axial direction of the fixing holes is parallel to the axial direction of the support shaft. The rotating frame is screwed and fixed to the support shaft through the fixing holes.

Images