Sickbed and lifting device thereof
By introducing a monitoring unit into the hospital bed lifting device, the separation state between the second transmission unit and the first transmission unit is monitored in real time, and the power generator is prevented from running, which solves the safety hazards of the hospital bed lifting device and realizes the anti-fall function.
Patent Information
- Application Number
- CN202422066184.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-08-23
AI Technical Summary
When the existing hospital bed lifting device is separated from the driving device, it is easy to cause the bed plate to fall suddenly, posing a safety hazard.
A hospital bed lifting device is designed, including a height adjustment unit, a driving assembly and a monitoring unit. By monitoring whether the second transmission unit and the first transmission unit are separated, the power generator is prevented from running in time and preventing the bed plate from falling.
Effectively prevent the bed plate from falling suddenly, improve the safety of the hospital bed and the reliability of the power generator, and avoid the triggering of mechanical structure damage and overload protection.
Smart Images
Figure CN223054692U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical devices, and particularly relates to a hospital bed and a lifting device thereof. Background Art
[0002] In scanning devices such as Magnetic Resonance Imaging (MRI) and Computed Tomography (CT), the hospital bed is usually equipped with a lifting device to enable the hospital bed to have a lifting function by using the lifting device, so that the patient carried on the hospital bed can be lifted from the initial position to the scanning height before the scan starts, and can be lowered from the scanning height to the initial height after the scan ends.
[0003] The existing lifting device is arranged between the base and the bed board of the hospital bed, and includes a driving device and a lifting unit. The driving device drives the lifting unit to move up and down to realize the lifting of the bed board. In such a driving device, by applying a force to the lifting unit, the lifting unit rises, and when the driving device unloads the force applied to the lifting unit, the lifting unit realizes the lowering through the self-weight pressing adaptive movement of the bed board. During this lowering process, the lifting unit is always in contact with the driving end of the driving device. That is to say, the driving end of the driving device is essentially a supporting member, which can make the lifting unit descend slowly.
[0004] Under normal circumstances, the lifting unit is always in contact with the driving end of the driving device. However, in some cases, the lifting unit gets stuck and does not descend when the driving device unloads the force, resulting in the separation of the lifting unit from the driving end and the loss of external support for the lifting unit. At this time, once the cause of the jamming is eliminated, the force balance of the lifting unit and the bed board is destroyed, leading to the sudden fall of the lifting unit. Summary of the Utility Model
[0005] The purpose of the utility model is to provide a hospital bed and a lifting device thereof, so that the lifting device has the function of preventing falling.
[0006] To achieve the above purpose, the utility model provides a hospital bed lifting device, which is connected between a base and a bed board. The hospital bed lifting device includes a height adjustment unit, a driving assembly and a monitoring unit;
[0007] The driving assembly includes a first transmission unit, a second transmission unit and a driving unit; the driving unit is arranged on the base and includes a power generator and a driver connected in communication; the first transmission unit is connected to the power generator, the second transmission unit is arranged on the height adjustment unit, and the second transmission unit is in sliding contact with the first transmission unit; the monitoring unit is at least connected to the driver.
[0008] Optionally, the second transmission unit is insulated and connected to the height adjustment unit;
[0009] The monitoring unit includes a power supply, the power supply is electrically connected to the second transmission unit and the driver respectively, and the driver is also electrically connected to the first transmission unit.
[0010] Optionally, the second transmission unit includes rolling elements and a rolling shaft, the rolling elements are rotatably mounted on the height adjustment unit through the rolling shaft, and the rolling elements are in contact with the first transmission unit; the rolling shaft includes a shaft body and an insulating isolation sleeve sleeved on the outer peripheral surface of the shaft body;
[0011] The power supply is electrically connected to the rolling element or the shaft body.
[0012] Optionally, the power supply is electrically connected to the shaft body through a wire.
[0013] Optionally, the monitoring unit includes a sensor, the sensor is configured to monitor target information, and the target information is used to determine whether the second transmission unit is separated from the first transmission unit.
[0014] Optionally, the sensor includes a force sensor, and the force sensor is disposed on the first transmission unit and / or the second transmission unit.
[0015] Optionally, the power generator includes a motor; the sensor includes a stroke sensor, and the stroke sensor is disposed on at least one of the base, the bed board, and the height adjustment unit.
[0016] Optionally, the stroke sensor includes a distance sensor, and the distance sensor is disposed on the base and / or the bed board.
[0017] Optionally, the height adjustment unit at least includes a first height adjustment arm and a second height adjustment arm that are cross - arranged, and the change in the angle between the first height adjustment arm and the second height adjustment arm represents the movement distance of the bed board relative to the base;
[0018] The stroke sensor includes an angle sensor, and the angle sensor is disposed on the height adjustment unit and is used to monitor the change in the angle between the first height adjustment arm and the second height adjustment arm.
[0019] To achieve the above object, the present utility model further provides a hospital bed, including the hospital bed lifting device, the base and the bed board as described above, one end of the height adjustment unit is rotatably connected to the base, and the other end is rotatably connected to the bed board.
[0020] Compared with the prior art, the hospital bed and its lifting device of the present utility model have the following advantages:
[0021] The aforementioned hospital bed lifting device is connected between the base and the bed board, and includes a height adjustment unit, a drive assembly, and a monitoring unit; the drive assembly includes a first transmission unit, a second transmission unit, and a drive unit; the drive unit is disposed on the base and includes a power generator and a driver connected in communication; the first transmission unit is connected to the power generator, the second transmission unit is disposed on the height adjustment unit, and the second transmission unit is in sliding contact with the first transmission unit; the monitoring unit is at least connected to the driver. Among them, the monitoring unit is configured to monitor whether the second transmission unit is separated from the first transmission unit; the hospital bed lifting device is further configured to prevent the driver from driving the power generator to operate when the second transmission unit is separated from the first transmission unit. During the application of this hospital bed lifting device, it can timely identify whether the second transmission unit is separated from the first transmission unit, and control the power generator to stop generating power at the moment of separation, avoiding the risk of the sudden fall of the bed board. Moreover, the use of the monitoring unit will not cause any adverse effects on the mechanical structure of the hospital bed, nor will it trigger the overload protection of the power generator, making the power generator have better reliability. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The drawings are used to better understand the present utility model and do not constitute an improper limitation to the present utility model. Among them:
[0023] Figure 1 is a schematic structural view of the hospital bed in some embodiments of the present utility model;
[0024] Figure 2 is a schematic structural view of the second transmission unit of the hospital bed in some embodiments of the present utility model;
[0025] Figure 3 is a schematic structural view of the hospital bed in other embodiments of the present utility model;
[0026] Figure 4 is a schematic structural view of the hospital bed in still other embodiments of the present utility model.
[0027] [The reference numerals are explained as follows]:
[0028] 10 - Base, 20 - Hospital bed lifting device, 100 - Height adjustment unit, 110 - First height adjustment arm, 120 - Second height adjustment arm, 200 - Drive assembly, 210 - First transmission unit, 211 - Curved surface, 220 - Second transmission unit, 221 - Rolling element, 222 - Rolling shaft, 222a - Shaft body, 222b - Insulating isolation sleeve, 230 - Drive unit, 231 - Power generator, 232 - Driver, 233 - Lead screw, 234 - Drive arm, 300 - Monitoring unit, 310 - Power supply, 320 - Conducting wire, 30 - Bed board. Detailed implementation manners
[0029] The following uses specific specific examples to illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model. It should be noted that the diagrams provided in this embodiment only illustrate the basic concept of the present utility model in a schematic manner. Therefore, only the components related to the present utility model are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components during actual implementation. The type, quantity, and ratio of each component during its actual implementation can be arbitrarily changed, and the component layout type may also be more complex.
[0030] In addition, each of the following description contents of the embodiments has one or more technical features. However, this does not mean that those who use the present utility model must simultaneously implement all the technical features in any one embodiment, or can only separately implement a part or all of the technical features in different embodiments. In other words, on the premise that implementation is possible, those skilled in the art can, according to the disclosed content of the present utility model and depending on design specifications or implementation requirements, selectively implement some or all of the technical features in any one embodiment, or selectively implement the combination of some or all of the technical features in multiple embodiments, thereby increasing the flexibility during the implementation of the present utility model.
[0031] As used in this specification, the singular forms "one", "an", and "the" include plural objects, and the plural form "a plurality" includes more than two objects, unless the content clearly indicates otherwise. As used in this specification, the term "or" is generally used in a sense that includes "and / or", unless the content clearly indicates otherwise, and the terms "installed", "connected", and "connected" 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 a connection between two elements or an interactive relationship between two elements. Relational terms such as the terms "first", "second", etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor do they indicate or imply relative importance or implicitly indicate the number of technical features indicated. It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0032] The utility model aims to provide a hospital bed lifting device and a hospital bed comprising the hospital bed lifting device. The hospital bed lifting device has a lifting function and also has a hospital bed anti-falling function.
[0033] In order to make the purpose, advantages and features of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the utility model. The same or similar reference numerals in the drawings represent the same or similar components.
[0034] Figure 1 , Figure 3 and Figure 4 Schematic diagrams of the structures of hospital beds in some different embodiments of the present invention are shown. Figure 1 , Figures 3 to 4As shown, the hospital bed includes a base 10, a bed lifting device 20, and a bed board 30. The bed board 30 is installed on the bed lifting device 20, and the bed lifting device 20 is installed on the base 10. The bed lifting device 20 is used to drive the bed board 30 to move relative to the base 10 to adjust the height of the bed board 30.
[0035] The bed board 30 is used to carry the target object. In some embodiments, the bed board 30 is rectangular, and in other embodiments, the shape of the bed board 30 can be adaptively adjusted based on actual usage requirements.
[0036] The bed lifting device 20 includes a height adjustment unit 100 and a drive assembly 200. One end of the height adjustment unit 100 is rotatably connected to the base 10, and the other end is rotatably connected to the bed board 30. The drive assembly 200 is used to apply power to the height adjustment unit 100 to drive the height adjustment unit 100 to move, so as to drive the bed board 30 to rise or fall. When the drive assembly 200 unloads the power applied to the height adjustment unit 100, the height adjustment unit 100 can also descend under the action of the self-weight of the bed board 30.
[0037] Among them, the drive assembly 200 includes a first transmission unit 210, a second transmission unit 220, and a drive unit 230. The drive unit 230 is arranged on the base 10 and includes a power generator 231 and a driver 232 connected in communication. The driver 232 is used to control the operation of the power generator 231 to generate power. The first transmission unit 210 is connected to the power generator 231 and moves under the drive of the power generated by the power generator 231. The second transmission unit 220 is arranged on the height adjustment unit 100 and is in sliding contact with the first transmission unit 210.
[0038] When the power generator 231 drives the first transmission unit 210 to move in the first direction, the first transmission unit 210 transmits power to the height adjustment unit 100 to drive the height adjustment unit 100 to move and drive the bed board 30 to rise; when the first transmission unit 210 moves in the second direction opposite to the first direction, the power applied to the height adjustment unit 100 is unloaded, so that the height adjustment unit 100 descends under the action of the self-weight of the bed board 30. Both the first direction and the second direction are parallel to the length direction of the bed board 30.
[0039] During the process in which the height adjustment unit 100 moves to drive the bed board 30 to rise, and during the process in which the height adjustment unit 100 moves to drive the bed board 30 to normally descend, the second transmission unit 220 is always in contact with the first transmission unit 210, and the first transmission unit 210 acts as a support member for the height adjustment unit 100 during the normal descent of the bed board 30, so that the bed board 30 descends slowly and smoothly. However, during the process in which the drive assembly 200 unloads the force applied to the height adjustment unit 100, if the height adjustment unit 100 gets stuck due to some reason and cannot descend normally, since the first transmission unit 210 is still driven by the power generator 231 to move, the second transmission unit 220 is separated from the first transmission unit 210, causing the height adjustment unit 100 to lose support. When the distance between the second transmission unit 220 and the first transmission unit 210 is relatively large, once the cause of the height unit 100 getting stuck is eliminated, the bed board 30 will suddenly drop due to unbalanced force.
[0040] Based on this, the hospital bed lifting device 20 further includes a monitoring unit 300. The monitoring unit 300 is at least connected to the driver 232 and is configured to monitor whether the second transmission unit 220 is separated from the first transmission unit 210. The hospital bed lifting device 20 is configured to prevent the driver 232 from controlling the power generator 231 to operate when the second transmission unit 220 is separated from the first transmission unit 210, so as to prevent the first transmission unit 210 from continuing to move at the moment when the second transmission unit 220 is separated from the first transmission unit 210, avoid the increase in the distance between the second transmission unit 220 and the first transmission unit 210, and thus avoid the problem that the height adjustment unit 100 and the bed board 30 suddenly drop. Moreover, the setting of the monitoring unit 300 will not cause any impact on the mechanical structure of the height adjustment unit 100 and the drive assembly 200, nor will it cause the power generator 231 to operate overload, making the power generator 231 have better reliability.
[0041] It should be understood that if it is determined that the second transmission unit 220 is separated from the first transmission unit 210, then only after the maintenance personnel eliminate the cause of the lifting device 20 getting stuck is the driver 232 allowed to re-control the power generator 231 to operate.
[0042] In the embodiment of the present invention, each component of the height adjustment unit 100 and the drive assembly 200 can be configured with reference to the prior art.
[0043] In some embodiments, such as Figure 1 、Figure 3 and Figure 4 As shown in and
[0044] , the height adjustment unit 100 includes a first height adjustment arm 110 and a second height adjustment arm 120.
[0044] One end of the first height adjustment arm 110 (the lower end of the first height adjustment arm 110 in Figure 1 , Figure 3 and Figure 4 ) is rotatably connected to the base 10, and the other end of the first height adjustment arm 110 (the upper end of the first height adjustment arm 110 in Figure 1 , Figure 3 , Figure 4 ) is rotatably connected to the bed board 30. One end of the second height adjustment arm 120 (the lower end of the second height adjustment arm 120 in Figure 1 , Figure 3 , Figure 4 ) is slidably engaged with the base 10 and can slide along the length direction of the bed board 30, and the other end of the second height adjustment arm 120 (the upper end of the second height adjustment arm 120 in Figure 1 , Figure 3 , Figure 4 ) is rotatably connected to the bed board 30. The second height adjustment arm 120 is the same length as the first height adjustment arm 110 and is arranged in a scissor shape in a crossed manner, and the two are rotatably connected at the crossed position. In this way, when the second height adjustment arm 120 rotates relative to the first height adjustment arm 110, it can be opened or closed in a scissor manner, causing the height adjustment unit 100 to perform a lifting motion and driving the bed board 30 to perform a lifting motion.
[0045] The second transmission unit 220 is rotatably arranged on the first height adjustment arm 110, and when the hospital bed lifting device 20 is in a normal state, the relative rotation of the second height adjustment arm 120 and the first height adjustment arm 110 is controlled by the drive assembly 200. The normal state refers to the state where the second transmission unit 220 is in contact with the first transmission unit 210. Specifically, when the first transmission unit 210 moves in the first direction, the second transmission unit 220 transmits power to the height adjustment unit 100 so that the first height adjustment arm 110 and the second height adjustment arm 120 rotate relative to each other, causing the height adjustment unit 100 to move and drive the bed board 30 to rise; when the first transmission unit 210 moves in the second direction, the height adjustment unit 100 causes the first height adjustment arm 110 and the second height adjustment arm 120 to rotate relative to each other under the action of the self-weight of the bed board 30, causing the height adjustment unit 100 to move and the bed board 30 to descend. The first direction is the direction close to the connection position between the first height adjustment arm 110 and the base 10, and the second direction is the direction away from the connection position between the first height adjustment arm 110 and the base 10.
[0046] It can be understood that when the height adjustment unit 100 moves to drive the bed board 30 to rise, the lower end of the second height adjustment arm 120 moves in the first direction, and when the height adjustment unit 100 moves to cause the bed board 30 to descend, the lower end of the second height adjustment arm 120 moves in the second direction.
[0047] It can also be understood that the rotation axes at the rotational connection between the first height adjustment arm 110 and the second height adjustment arm 120, the rotation axis at the rotational connection between the first height adjustment arm 110 and the base 10, the rotation axis at the rotational connection between the first height adjustment arm 110 and the bed board 30, and the rotation axis at the rotational connection between the second height adjustment arm 120 and the bed board 30 are parallel to each other and extend along the width direction of the bed board 30.
[0048] The above-mentioned height adjustment unit 100 is a first-level scissor lift structure. In some alternative embodiments, the height adjustment unit may also be a multi-level scissor lift structure formed by two or more intersecting height adjustment arms (not shown in the figure), or the height adjustment unit may be a parallelogram lift structure (not shown in the figure). The specific structure of the height adjustment unit 100 can be adaptively adjusted according to actual usage requirements.
[0049] The driving unit 230 includes a fixed part and a moving part. The fixed part is fixedly arranged on the base 10 and includes the power generator 231 and the driver 232. The moving part is connected to the fixed part and can partially move relative to the fixed part along the first direction or the second direction.
[0050] In some specific embodiments, the power generator 231 includes a motor. Preferably, the power generator 231 further includes a speed reducer connected to the output end of the motor. The moving part is a lead screw nut pair, which includes a lead screw 233 and a driving arm 234. The lead screw 233 extends along the length direction of the bed board 30 and is in transmission cooperation with the output end of the speed reducer. The lead screw 233 is in screw transmission cooperation with the driving arm 234. The driving arm 234 is connected to the first transmission unit 210. When the lead screw 233 rotates, it drives the driving arm 234 to move linearly, and further drives the first transmission unit 210 to move along the first direction or the second direction.
[0051] The first transmission unit 210 may have a curved surface 211. The structure of the second transmission unit 220 may be as Figure 2 shown, including rolling elements 221 and rolling shafts 222. The rolling elements 221 are rotatably mounted on the height adjustment element 100 through the rolling shafts 222. The rolling elements 221 are used to contact the curved surface 211.
[0052] The monitoring unit 300 may have a variety of optional configurations.
[0053] In some embodiments, the base 10, the height adjustment unit 100, and the first transmission unit 210 are all made of conductive materials. The rolling elements 221 of the second transmission unit 220 are made of conductive materials, and the second transmission unit 220 is insulated from the height adjustment unit 100. The monitoring unit 300 is configured to form a closed loop with the base 10, the height adjustment unit 100, and the drive assembly 300 when the hospital bed lifting device 20 is in a normal state, and form an open circuit with the base 10, the height adjustment unit 100, and the drive assembly 300 when the hospital bed lifting device 20 is in an abnormal state. Here, the abnormal state refers to the state where the second transmission unit 220 is separated from the first unit 210.
[0054] Specifically, please refer to Figure 1, the monitoring unit 300 includes a power supply 310 and a wire 320. The power supply 310 is electrically connected to the second transmission unit 220 and the driver 232 through the wire 320 respectively, and the driver 232 is also electrically connected to the first transmission unit 210 in any suitable manner. When the hospital bed lifting device 20 is in the normal state, the second transmission unit 220 is also electrically connected to the first transmission unit 210, so that the circuit formed by the power supply 310, the wire 320, the second transmission unit 220, the height adjustment unit 100, and the drive assembly 230 is closed to form a closed loop, allowing the power supply 310 to supply power to the driver 232, and further allowing the driver 232 to control the operation of the power generator 231. When the hospital bed lifting device 20 is in an abnormal state, since the second transmission unit 220 is separated from the first transmission unit 210, the circuit formed by the power supply 310, the wire 320, the second transmission unit 220, the height adjustment unit 100, and the drive assembly 230 is disconnected, and the power supply 310 cannot supply power to the driver 232, so that the driver 232 cannot control the operation of the power generator 231.
[0055] In some cases, the rolling shaft 222 is made of an insulating material, and then the power supply 310 is connected to the rolling element 221 through the wire 320. In other cases, as Figure 2 shown, the rolling shaft 222 includes a shaft body 222a and an insulating sleeve 222b. The shaft body 222a is made of a conductive material, and the insulating sleeve 222b is sleeved on the outer peripheral surface of the shaft body 222a. Thus, when the second transmission unit 220 is connected to the height adjustment unit 100, electrical isolation between the shaft body 222a and the height adjustment unit 100 is achieved through the insulating sleeve 111b. In this case, the power supply 310 can be connected to either the rolling element 221 or the shaft body 222a through the wire 320. Preferably, the power supply 310 is connected to the shaft body 222a through the wire 320. Preferably, the connection point of the wire 320 and the shaft body 222a is located at the axis of the shaft body 222a, thereby avoiding the problem of kinking caused by the rotation of the wire 320 with the rotation of the second transmission unit 220.
[0056] The embodiment of the present utility model does not have special limitations on the configuration of the power supply 310, as long as it meets the expected voltage requirements. The expected voltage is generally 24V. The power supply 310 can be a power supply structure independent of the mains system or a power supply structure connected from the mains system.
[0057] In other embodiments, please refer to Figure 3 and Figure 4 The electrical monitoring element 300 includes a sensor, and the sensor is used to monitor target information, and the target information is used to determine whether the second transmission unit 220 is separated from the first transmission unit 210.
[0058] It can be understood that when the bed lifting device 20 is in a normal state, the bed has the following characteristics: ① there is a large interaction force between the second transmission unit 220 and the first transmission unit 210; ② when the power generator 231 includes a motor, the movement distance of the bed board 30 relative to the base 10 and the rotation angle of the motor conform to a predetermined conversion relationship. The rotation angle of the motor is monitored by its own angle encoder.
[0059] Based on the above feature ①, the target information includes the interaction force between the first transmission unit 210 and the second transmission unit 220, and the sensor includes a force sensor. The force sensor is arranged on one of the first transmission unit 210 and the second transmission unit 220 to monitor the interaction force between the first transmission unit 210 and the second transmission unit 220, and judge whether the first transmission unit 210 and the second transmission unit 220 are separated based on the monitored value. That is, when the value monitored by the force sensor is greater than a preset first threshold value, it is determined that the first transmission unit 210 is in contact with the second transmission unit 220; when the value monitored by the force sensor is less than a preset second threshold value, it is determined that the first transmission unit 210 is separated from the second transmission unit 220. It can be understood that the second threshold value is less than the first threshold value.
[0060] Based on the above feature ②, the target information includes the movement distance of the bed board 30 relative to the base 10, or other parameter information that can characterize the movement distance of the bed board 10 relative to the base 10, and the sensor may include a stroke sensor. The stroke sensor directly monitors the movement distance of the bed board 30 relative to the base 10, or monitors other parameter information that can characterize the movement distance of the bed board 30 relative to the base 10. When the parameter value monitored by the stroke sensor and the rotation angle of the motor meet the predetermined conversion relationship, it can be determined that the second transmission unit 220 is in contact with the first transmission unit 210; when the parameter value monitored by the stroke sensor and the rotation angle of the motor do not meet the predetermined relationship, it can be determined that the second transmission unit 220 is separated from the first transmission unit 210. According to the specific type of the stroke sensor, the stroke sensor can be set on at least one of the base 10, the bed board 30, and the height adjustment unit 100.
[0061] In some embodiments, the travel sensor includes a distance sensor, such as an infrared distance sensor, a pull-wire sensor, etc., and the distance sensor can directly monitor the movement distance of the bed board 30 relative to the base 10. For an infrared distance sensor with an integrated receiver, it can be set on the base 10 or on the bed board 30; for an infrared distance sensor including a split transmitter and receiver, one of the transmitter and the receiver is set on the base 10, and the other is correspondingly set on the bed board 30. For a pull-wire sensor, its pull-wire box can be set on one of the base 10 and the bed board 30, and the free end of the pull wire is set on the other of the base 10 and the bed board 30; or, the pull-wire box is set at one end of the height adjustment unit 100 connected to the base 10, for example Figure 1 , Figure 3 and Figure 4 The free end of the pull wire is arranged at the lower end of the first height adjustment arm 110 in the height adjustment unit 100 and at one end connected to the bed board 30, for example Figure 1 , Figure 3 and Figure 4 On the upper end of the first height adjustment arm 110, the embodiment of the utility model is not limited to this.
[0062] In other embodiments, for the height adjustment unit 100 including the first height adjustment arm 110 and the second height adjustment arm 120 arranged crosswise, the travel sensor may include an angle sensor, which is disposed on the height adjustment unit 100 and is used to monitor the angle change between the first height adjustment arm 110 and the second height adjustment arm 120. It can be understood that the angle change between the first height adjustment arm 110 and the second height adjustment arm 120 determines the movement distance of the bed board 30 relative to the base 10. That is, by monitoring the angle change between the first height adjustment arm 110 and the second height adjustment arm 120, the movement distance of the bed board 30 relative to the base 10 is also indirectly monitored. In other words, when the hospital bed lifting device 20 is in a normal state, as the height adjustment unit 100 is raised and lowered, the angle change between the first height adjustment arm 110 and the second height adjustment arm 120 and the rotation angle of the motor conform to a predetermined conversion relationship. Therefore, if the angle change between the first height adjustment arm 110 and the second height adjustment arm 120 monitored by the angle sensor does not conform to the conversion relationship with the rotation angle of the motor, it is determined that the second transmission unit 220 is separated from the first transmission unit 210 .
[0063] In some embodiments, the sensor includes more than two of the stroke sensors, and the hospital bed lifting device 20 is configured to prevent the driver 232 from controlling the operation of the motor when any one of the stroke sensors monitors that the second transmission unit 220 is separated from the first transmission unit 210. The advantage of this is to improve the reliability of the monitoring unit 210 through redundant configuration.
[0064] Of course, in some other embodiments, the sensor may include both the force sensor and the stroke sensor at the same time, and the hospital bed lifting device 20 is configured to prevent the driver 232 from controlling the operation of the motor when any one of the sensors monitors that the second transmission unit 220 is separated from the first transmission unit 210.
[0065] Although the present utility model is disclosed as above, it is not limited thereto. Those skilled in the art can make various changes and modifications to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and its equivalent technologies, the present utility model also intends to include these changes and modifications therein.
Claims
1. A hospital bed lifting device is connected between a base (10) and a bed board ((30), and is characterized in that, The hospital bed lifting device (20) includes a height adjustment unit (100), a drive assembly (200), and a monitoring unit (300); The drive assembly (200) includes a first transmission unit (210), a second transmission unit (220), and a drive unit (230); the drive unit (230) is disposed on the base (10), and the drive unit (230) includes a power generator (231) and a driver (232) that are communicatively connected; the first transmission unit (210) is connected to the power generator (231), the second transmission unit (220) is disposed on the height adjustment unit (100), and the second transmission unit (220) is in sliding contact with the first transmission unit (210); the monitoring unit (300) is at least connected to the driver (232).
2. The hospital bed lifting device according to claim 1, wherein The second transmission unit (220) is insulatedly connected to the height adjustment unit (100); The monitoring unit (300) includes a power supply (310), the power supply (310) is electrically connected to the second transmission unit (220) and the driver (232) respectively, and the driver (232) is also electrically connected to the first transmission unit (210).
3. The hospital bed lifting device according to claim 2, wherein The second transmission unit (220) includes rolling elements (221) and a rolling shaft (222), the rolling elements (221) are rotatably mounted on the height adjustment unit (100) through the rolling shaft (222), and the rolling elements (221) are in contact with the first transmission unit (210); the rolling shaft (222) includes a shaft body (222a) and an insulating isolation sleeve (222b) sleeved on the outer peripheral surface of the shaft body (222a); The power supply (310) is electrically connected to the rolling elements (221) and / or the shaft body (222a).
4. The hospital bed lifting device according to claim 3, wherein, The power supply ((310) is electrically connected to the shaft body (222a) through a wire (320).
5. The hospital bed lifting device according to any one of claims 1-4, characterized in that, The monitoring unit (300) includes a sensor, the sensor is configured to monitor target information, and the target information is used to determine whether the second transmission unit is separated from the first transmission unit.
6. The hospital bed lifting device according to claim 5, characterized in that The sensor includes a force sensor, and the force sensor is disposed on the first transmission unit (210) and / or the second transmission unit (220).
7. The hospital bed lifting device according to claim 5, wherein The power generator includes a motor; the sensor includes a travel sensor, and the travel sensor is disposed on at least one of the base (10), the bed board (30), and the height adjustment unit (100).
8. The hospital bed lifting device according to claim 7, characterized in that, The travel sensor includes a distance sensor, and the distance sensor is disposed on the base (10) and / or the bed board (30).
9. The hospital bed lifting device according to claim 7, wherein, The height adjustment unit (100) at least includes a first height adjustment arm (110) and a second height adjustment arm (120) that are cross - arranged, and the angle change between the first height adjustment arm (110) and the second height adjustment arm (120) characterizes the movement distance of the bed board (30) relative to the base (10); The stroke sensor includes an angle sensor, which is disposed on the height adjustment unit (100) and is used to monitor the angle change between the first height adjustment arm (110) and the second height adjustment arm (120).
10. A hospital bed, characterized in that, Comprising a hospital bed lifting device (20), a base (10) and a bed board (30) as described in any one of claims 1-9, one end of the height adjustment unit (100) is connected to the base (10) and the other end is connected to the bed board (30).