Medical bed electric push rod with good protection

Abstract

The utility model belongs to medical bed accessory technical field discloses a good protective medical bed electric push rod, including mounting seat, fixedly connected on the main rod of mounting seat and the extension rod of sliding connection on the main rod, the motor is slidably connected on the mounting seat, the handle is rotatably connected on the mounting seat, the drive assembly, clutch assembly and switching assembly are fixedly connected in the mounting seat, drive assembly is used for through motor or handle drive the extension rod relative to the main rod extension, clutch assembly is used for through control motor and drive assembly's separation and close to realize electric push rod's electric operation and manual operation's switching of switching, the utility model discloses the quick switching structure of built -in clutch assembly, can switch to manual operation mode in time when motor power failure or trouble, ensure the timely adjustment of medical bed height and angle under the emergency, solved the problem that electric push rod exists security risk under the power -off scene.

Description

Technical Field

[0001] This utility model relates to the field of medical bed accessories technology, and more specifically, to an electric push rod for a medical bed with good protection. Background Technology

[0002] As a core piece of equipment in modern medical care, the functionality and safety of medical beds directly affect the treatment effect and nursing experience of patients. As a core driving component of medical beds, electric push rods enable precise adjustment of bed height, backrest angle, and leg support through motor drive, greatly improving the convenience of operation for medical staff and the comfort of patients. In recent years, with the popularization of intelligent medical equipment, the reliability and protective performance of electric push rods have become the focus of industry attention.

[0003] However, in scenarios such as patient transfer or power outages due to circuit failures, medical staff may find it difficult to quickly adjust the bed position, which could lead to positional injuries or even falls for patients, making it difficult to meet the safety requirements of the medical environment.

[0004] In view of this, we propose an electric actuator for medical beds with good protection. Utility Model Content

[0005] 1. Technical problems to be solved

[0006] The purpose of this invention is to provide a protective electric actuator for a medical bed, so as to solve the problem mentioned in the background art that traditional electric actuators for medical beds are inconvenient to operate in the event of a power outage, thus posing a safety hazard.

[0007] 2. Technical Solution

[0008] A protective electric push rod for a medical bed includes a mounting base, a main rod fixedly connected to the mounting base, and an extension rod slidably connected to the main rod. A motor is slidably connected to the mounting base, and a handle is rotatably connected to the mounting base. A drive assembly, a clutch assembly, and a switching assembly are fixedly connected inside the mounting base.

[0009] A drive assembly for extending the extension rod relative to the main rod via a motor or handle;

[0010] The clutch assembly is used to switch between electric and manual operation of the electric actuator by controlling the separation and closure of the motor and drive assembly.

[0011] Preferably, the drive assembly includes a first gear, a second gear, and a third gear rotatably connected within the mounting base. The second gear meshes with both the first and third gears. A first bevel gear is fixedly connected to the third gear. A screw is rotatably connected within the mounting base. A threaded sleeve is threaded onto the screw via a ball screw pair. The threaded sleeve is fixedly connected to the bottom of the extension rod. A second bevel gear meshes with the first bevel gear and is fixedly connected to the screw. One side of the first gear is fixedly connected to the handle, and the other side of the first gear is connected to the clutch assembly.

[0012] Preferably, the clutch assembly includes a fixed block fixedly connected to the side of the first gear facing away from the handle and a rotating block that can rotate at a small angle relative to the fixed block. The output end of the motor is fixedly connected to a plug rod with a cross-section of "+". The rotating block has a slot that matches the size of the plug rod. The plug rod is used to insert into the slot and drive the first gear to rotate through the rotating block.

[0013] Preferably, the wall of the slot is provided with a sloping guide ramp to facilitate the insertion of the insertion rod.

[0014] Preferably, two limiting rods are fixedly connected to the rotating block, and two arc-shaped adjustment grooves are provided on the fixed block. The adjustment grooves are used to limit the rotating block to a small angle relative to the fixed block when the insertion rod is inserted into the slot.

[0015] Preferably, a movable plate is fixedly connected to one side of the motor, and a locking rod is elastically connected to the movable plate by a spring. A mounting plate is fixedly connected to the mounting base, and the mounting plate has a first locking groove and a second locking groove adapted to the locking rod. When the locking rod is located in the first locking groove, the insert rod is just inserted into the slot. When the locking rod is located in the second locking groove, the insert rod is disengaged from the slot.

[0016] Preferably, a sealing ring is fixedly connected to the top of the main rod, and the sealing ring has two sealing lips.

[0017] 3. Beneficial effects

[0018] Compared with existing technologies, the advantages of this utility model are:

[0019] 1. This utility model, through its built-in clutch component and quick-switching structure, can instantly switch to manual operation mode when the motor is powered off or malfunctions, ensuring timely adjustment of the height and angle of the medical bed in emergency situations, and solving the safety risk problem of electric push rods in power outage scenarios.

[0020] 2. This utility model enables quick switching between electric and manual operation of the electric push rod through the locking rod and locking groove. Combined with the double-lip sealing ring design at the top of the main rod, it ensures good protection for the electric push rod while allowing medical staff to switch between manual and electric operation modes more conveniently.

[0021] 3. The mechanical transmission link of the gear set and bevel gear reversing structure of this utility model, combined with the power conversion of the ball screw pair, significantly reduces the force required for manual operation. Even when the motor is disengaged, the push rod can still be driven to extend or retract by inputting power through the handle. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 This is a three-dimensional structural diagram of the present invention from another angle;

[0024] Figure 3 This is an exploded view of the extension rod and screw of this utility model;

[0025] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0026] Figure 5 This is a connection diagram of the drive components of this utility model;

[0027] Figure 6 This is an exploded view of the fixed block and rotating block of this utility model;

[0028] Figure 7 This is a schematic diagram of the structure of the adjusting groove of this utility model;

[0029] Figure 8 This is a cross-sectional schematic diagram of the sealing ring of this utility model.

[0030] The following are the labeling instructions in the diagram: 1. Mounting base; 11. Main rod; 12. Extending rod; 13. Mounting plate; 14. Motor; 15. Handle; 16. Sealing ring; 17. Sealing lip; 2. Drive assembly; 21. First gear; 22. Second gear; 23. Third gear; 24. First bevel gear; 25. Second bevel gear; 26. Screw; 27. Screw sleeve; 3. Clutch assembly; 31. Fixed block; 32. Rotating block; 33. Insert rod; 34. Slot; 35. Guide slope; 36. Limiting rod; 37. Adjusting groove; 38. Movable plate; 39. Locking rod; 311. First locking groove; 312. Second locking groove. Detailed Implementation

[0031] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" 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 a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] Please see Figure 1-8 This utility model provides a technical solution:

[0035] An electric push rod for a medical bed with good protection includes a mounting base 1, a main rod 11 fixedly connected to the mounting base 1, and an extension rod 12 slidably connected to the main rod 11. During installation, the main rod 11 should be connected to the bottom of the medical bed, and the extension rod 12 should be connected to the bed board of the medical bed. A motor 14 is slidably connected to the mounting base 1, and a handle 15 is rotatably connected to the mounting base 1. A drive assembly 2, a clutch assembly 3, and a switching assembly are fixedly connected inside the mounting base 1. The drive assembly 2 is used to drive the extension rod 12 to extend relative to the main rod 11 through the motor 14 or the handle 15. The clutch assembly 3 is used to switch between electric and manual operation of the electric push rod by controlling the separation and closure of the motor 14 and the drive assembly 2. This design integrates the operation mode switching function, avoiding the risk of liquid and dust intrusion caused by the exposed switching port in traditional designs. In addition, the sliding connection design of the motor 14 provides physical travel space for the clutch movement and enables centralized control of the drive power and manual input, simplifying the internal layout of the push rod. In specific implementation, the wear resistance of the sliding track of the motor 14 is ensured to avoid positioning deviation after long-term use.

[0036] Additionally, the drive assembly 2 includes a first gear 21, a second gear 22, and a third gear 23 rotatably connected within the mounting base 1. The second gear 22 meshes with both the first gear 21 and the third gear 23. A first bevel gear 24 is fixedly connected to the third gear 23. A screw 26 is rotatably connected within the mounting base 1. A threaded sleeve 27 is threaded onto the screw 26 via a ball screw pair. The threaded sleeve 27 is fixedly connected to the bottom of the extension rod 12. A second bevel gear 25, meshing with the first bevel gear 24, is fixedly connected to the screw 26. One side of the first gear 21... The first gear 21 is fixedly connected to the handle 15, and the other side of the first gear 21 is connected to the clutch assembly 3. This configuration simplifies the complex structure of the traditional dual-path transmission by simultaneously connecting the first gear 21 to the input shaft of the handle 15 and the clutch output end. The bevel gear set converts the horizontal rotation into the vertical power of the screw 26, improving space utilization. It should be noted that chemical disinfectants in the medical environment can easily corrode the working surface of the gears. Therefore, the gear surface should be ceramicized, and grease should be injected into the gearbox to prevent corrosive substances from affecting the core transmission components of the device.

[0037] In specific implementation, more reduction gear modules can be added between the first gear 21 and the second bevel gear 25 to further reduce the input force during manual operation, ensuring that medical staff can manually drive the push rod to extend and retract. In addition, when adjusting electrically, the handle 15 will continue to rotate freely. In specific implementation, the handle 15 can be set as a folding handle 15 or a detachable handle 15 for easy use.

[0038] Secondly, the clutch assembly 3 includes a fixed block 31 fixedly connected to the side of the first gear 21 facing away from the handle 15 and a rotating block 32 that can rotate at a small angle relative to the fixed block 31. The output end of the motor 14 is fixedly connected to a plug rod 33 with a cross-shaped cross section. The rotating block 32 has a slot 34 that matches the size of the plug rod 33. The plug rod 33 is used to insert into the slot 34 and drive the first gear 21 to rotate through the rotating block 32. With this configuration, the power of the motor 14 is rigidly transmitted to the first gear 21 through the cross-shaped plug rod 33 and the slot 34. The design of the rotating block 32 being able to deflect around the fixed block 31 at a small angle can eliminate assembly errors during the insertion process.

[0039] Furthermore, the wall of the slot 34 is provided with a sloping guide slope 35 to facilitate the insertion of the rod 33. The guide slope 35 can correct the positional deviation between the rod 33 and the slot 34, so that the rod 33 can still be inserted into the slot 34 of the rotating block 32 relatively smoothly after manual operation.

[0040] Specifically, two limiting rods 36 are fixedly connected to the rotating block 32, and two arc-shaped adjustment grooves 37 are provided on the fixed block 31. The adjustment grooves 37 are used to limit the rotating block 32 to a small angle relative to the fixed block 31 when the insertion rod 33 is inserted into the slot 34. In this way, the two limiting rods 36 and the arc-shaped adjustment grooves 37 form an angle compensation mechanism. When the insertion rod 33 contacts the inclined surface of the slot 34, it will push the rotating block 32 to rotate until the limiting rods 36 abut against the end of the adjustment grooves 37 to complete the precise positioning. This process eliminates the error during alignment, and the arc-shaped grooves can also limit the deflection angle of the rotating block 32 to avoid excessive rotation and gear misalignment.

[0041] Furthermore, a movable plate 38 is fixedly connected to one side of the motor 14. A locking rod 39 is elastically connected to the movable plate 38 via a spring. A mounting plate 13 is fixedly connected to the mounting base 1. The mounting plate 13 has a first locking groove 311 and a second locking groove 312 that are adapted to the locking rod 39. When the locking rod 39 is in the first locking groove 311, the insert rod 33 is inserted into the slot 34. When the locking rod 39 is in the second locking groove 312, the insert rod 33 is disengaged from the slot 34. This arrangement allows the operator to push and pull the motor 14 to switch the locking rod 39 between the two locking grooves, making it easier to switch between manual and electric modes.

[0042] Furthermore, a sealing ring 16 is fixedly connected to the top of the main rod 11. Two sealing lips 17 are provided on the sealing ring 16. This arrangement allows the top sealing lip 17 to tightly scrape off any adhering substances on the surface of the protruding rod 12, while the bottom sealing lip 17 further blocks the penetration of external impurities. The closed cavity formed between the two lips can store silicone grease to form a secondary liquid seal, maintaining the protective function even if a single layer of seal is damaged.

[0043] Working principle:

[0044] Under normal conditions, the motor 14 of this protective medical bed electric actuator is powered on and running normally. Its output end, the cross-shaped insert 33, is inserted into the slot 34 of the rotating block 32. The motor 14 drives the rotating block 32 to rotate via the insert 33, synchronously rotating the fixedly connected first gear 21. The first gear 21 transmits torque to the first bevel gear 24 via the second gear 22 and the third gear 23. The second bevel gear 25, which meshes with it, converts the horizontal rotation into the vertical rotation of the screw 26. Finally, the ball screw pair pushes the screw sleeve 27 and the extension rod 1. 2. Extends along the main rod 11 axially to realize the electric lifting and adjustment of the medical bed. In case of sudden power failure or emergency manual operation, medical staff pull up the locking rod 39 to push the motor 14 to move along the sliding track until the locking rod 39 is engaged in the second locking groove 312. During this process, the insertion rod 33 is completely pulled out from the slot 34 of the rotating block 32, and the power transmission path of the motor 14 is cut off. At this time, the handle 15 is turned and the manual input torque directly drives the first gear 21 to rotate. The transmission path of the subsequent gear set, bevel gear and screw 26 remains unchanged, and the movement of the extension rod 12 continues to be controlled.

[0045] It should be noted that there is no need to immediately reset the motor 14 after manual operation: In the absence of power, even if the motor 14 is not reset, the self-locking characteristic of the ball screw pair and the static friction of the main rod 11 and the extension rod 12 will automatically maintain the position of the push rod unchanged. After the power is restored, it is only necessary to push the locking rod 39 back into the first locking groove 311. At this time, the inclined guide slope 35 at the entrance of the slot 34 will automatically guide the cross rod 33 into place. The rotating block 32 will slightly deflect within the arc-shaped adjustment groove 37 through the limit rod 36 to compensate for the alignment deviation and ensure the smooth progress of the reset process.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A protective electric actuator for a medical bed, characterized in that: It includes a mounting base (1), a main rod (11) fixedly connected to the mounting base (1), and an extension rod (12) slidably connected to the main rod (11). A motor (14) is slidably connected to the mounting base (1), and a handle (15) is rotatably connected to the mounting base (1). A drive assembly (2), a clutch assembly (3), and a switching assembly are fixedly connected inside the mounting base (1). A drive assembly (2) for driving the extension rod (12) to extend relative to the main rod (11) via a motor (14) or a handle (15); The clutch assembly (3) is used to switch between electric and manual operation of the electric actuator by controlling the separation and closure of the motor (14) and the drive assembly (2).

2. The electrically operated push rod for a medical bed with good protective properties as described in claim 1, characterized in that: The drive assembly (2) includes a first gear (21), a second gear (22), and a third gear (23) rotatably connected within the mounting base (1). The second gear (22) meshes with both the first gear (21) and the third gear (23). A first bevel gear (24) is fixedly connected to the third gear (23). A screw (26) is rotatably connected within the mounting base (1). A threaded sleeve (27) is threaded onto the screw (26) via a ball screw thread. The threaded sleeve (27) is fixedly connected to the bottom of the extension rod (12). A second bevel gear (25) meshes with the first bevel gear (24) and is fixedly connected to the screw (26). One side of the first gear (21) is fixedly connected to the handle (15), and the other side of the first gear (21) is connected to the clutch assembly (3).

3. The electrically operated push rod for a medical bed with good protective properties as described in claim 2, characterized in that: The clutch assembly (3) includes a fixed block (31) fixedly connected to the side of the first gear (21) facing away from the handle (15) and a rotating block (32) that can rotate at a small angle relative to the fixed block (31). The output end of the motor (14) is fixedly connected to a plug rod (33) with a cross-shaped cross section. The rotating block (32) has a slot (34) that matches the size of the plug rod (33). The plug rod (33) is used to insert into the slot (34) and drive the first gear (21) to rotate through the rotating block (32).

4. The electrically operated push rod for a medical bed with good protective properties as described in claim 3, characterized in that: The wall of the slot (34) is provided with a guide slope (35) that is inclined to facilitate the insertion of the insertion rod (33).

5. The electrically operated push rod for a medical bed with good protective properties as described in claim 3, characterized in that: Two limiting rods (36) are fixedly connected to the rotating block (32), and two arc-shaped adjustment grooves (37) are provided on the fixed block (31). The adjustment grooves (37) are used to limit the rotating block (32) to be finely adjusted relative to the fixed block (31) by a small angle when the insertion rod (33) is inserted into the slot (34).

6. The electrically operated push rod for a medical bed with good protective properties as described in claim 5, characterized in that: A movable plate (38) is fixedly connected to one side of the motor (14). A locking rod (39) is elastically connected to the movable plate (38) by a spring. A mounting plate (13) is fixedly connected to the mounting base (1). The mounting plate (13) has a first locking groove (311) and a second locking groove (312) that are adapted to the locking rod (39). When the locking rod (39) is located in the first locking groove (311), the insert rod (33) is just inserted into the slot (34). When the locking rod (39) is located in the second locking groove (312), the insert rod (33) is disengaged from the slot (34).

7. The electrically operated push rod for a medical bed with good protective properties as described in claim 1, characterized in that: A sealing ring (16) is fixedly connected to the top of the main rod (11), and two sealing lips (17) are provided on the sealing ring (16).

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