A lifting mechanism special for medical instruments

Abstract

The application relates to the field of jacking mechanisms, in particular to a jacking mechanism special for medical instruments. The jacking mechanism comprises a driving part, a transmission part and a jacking part. The driving part comprises a motor and a speed reducer matched with each other. The transmission part comprises a driving bevel gear, a driven bevel gear, a transition flange, a machine cover, a shell, an outer sleeve, a front support base, a transmission nut, a transmission shaft sleeve, a sleeve sleeve and a protection sleeve. The jacking part comprises a transmission screw rod and a jacking head. The application increases the proportion of the effective stroke length of the transmission screw rod on the total length of the jacking mechanism, thereby reducing the installation space of the jacking mechanism, reducing the volume and weight of the equipment, and reducing the equipment cost. The transmission screw rod is a single-head trapezoidal screw rod and can be self-locked, thereby improving the safety and reliability of use. The motor can be without a brake, thereby further reducing the product cost.

Description

Technical Field

[0001] This invention relates to the field of lifting mechanisms, and more particularly to a lifting mechanism specifically for medical devices. Background Technology

[0002] Currently, medical equipment with bed-lifting functions primarily uses a scissor-fork lifting mechanism. This structure is labor-intensive and saves on stroke, thus reducing the installation space required for the corresponding lifting mechanism. Existing technology commonly uses a reciprocating servo electric cylinder as the actuator. When a servo electric cylinder operates, the lead screw position is fixed; it only rotates and does not move. Therefore, its stroke is limited to the length of the lead screw that is not occupied by other components. Calculating the stroke requires subtracting the dimensions of the timing pulley, bearings, retaining rings, lock nuts, transmission nuts, guide heads, and other mating parts from the total lead screw length. As a result, the effective stroke length only accounts for about 35%-40% of the total length of the servo electric cylinder. This leads to a large equipment size and increased manufacturing costs. Furthermore, the transmission lead screw of a servo electric cylinder is generally a ball screw, which is not self-locking. The servo motor must be equipped with a brake, further increasing production costs. Summary of the Invention

[0003] To address the problems existing in the background technology, this invention proposes a lifting mechanism specifically for medical devices. This invention reduces the installation space, equipment size and weight, and lowers costs by increasing the proportion of the effective stroke length of the transmission screw to the total length of the lifting mechanism. The transmission screw is a single-start trapezoidal screw with self-locking capability, improving safety and reliability. The motor used does not require a holding brake, further reducing product costs.

[0004] This invention proposes a lifting mechanism specifically for medical devices, comprising a drive unit, a transmission unit, and a lifting unit. The drive unit includes a motor and a reducer that cooperate with each other. The transmission unit includes a driving bevel gear, a driven bevel gear, a transition flange, a cover, a housing, an outer protective sleeve, a front support base, a transmission nut, a transmission shaft sleeve, a protective sleeve, and a protective sleeve; the front support base, outer protective sleeve, transition flange, cover, housing, protective sleeve, and protective sleeve are connected sequentially from top to bottom to form a transmission chamber; the transmission shaft sleeve is rotatably disposed within the transmission chamber; the driven bevel gear is keyed to the lower end of the transmission shaft sleeve; the driving bevel gear is keyed to the reduction end of the reducer and extends into the transmission chamber to mesh with the driven bevel gear; the transmission nut is disposed at the upper end of the transmission shaft sleeve and is rotatably connected to the front support base. The lifting unit includes a transmission screw and a lifting head; the transmission screw is rotatably disposed within the transmission shaft sleeve, with its upper end threadedly engaged with the transmission nut; the lifting head extends out of the transmission chamber, its lower end connected to the top of the transmission screw, and its upper end has an inner hole for connecting an external pin.

[0005] Preferably, the reducer is an angle planetary reducer, which is connected to the driving bevel gear via a flat key.

[0006] Preferably, a retaining ring is provided at the front end of the driving bevel gear, and the two are connected by a countersunk hexagonal screw, and an adjusting washer is provided at the rear end of the driving bevel gear.

[0007] Preferably, the driven bevel gear and the drive shaft sleeve are connected by a double flat key.

[0008] Preferably, the lifting head is fixed to the upper end of the transmission screw via fine thread and set screw.

[0009] Preferably, the front support seat has an inner hole; the lower end of the inner hole has a bearing seat and a groove; a deep groove ball bearing is installed on the bearing seat; the transmission nut is rotatably connected to the front support seat through the deep groove ball bearing; a dustproof ring is provided on the groove; a graphite copper sleeve is inlaid at the upper end of the inner hole; the graphite copper sleeve and the transmission screw are clearance-fitted, with a clearance of 0.05-0.1mm.

[0010] Preferably, the upper end of the transmission nut is provided with a boss with a first optical shaft; the first optical shaft and the deep groove ball bearing are in clearance fit with a clearance of 0.03-0.05mm; the lower end of the transmission nut is provided with a stop that mates with the transmission shaft sleeve and is connected to the transmission shaft sleeve by a second internal hexagon screw.

[0011] Preferably, the bottom of the drive shaft sleeve is provided with a bearing seat two, and the middle is provided with a bearing seat three; a tapered roller bearing one is provided on bearing seat two; a tapered roller bearing two is provided on bearing seat three; the drive shaft sleeve is rotatably connected to the housing through tapered roller bearing one, and rotatably connected to the machine cover through tapered roller bearing two.

[0012] Preferably, the outer casing is machined from a standard cylinder barrel, and the outer wall of the cylinder barrel is provided with heat dissipation grooves and 4 oil nozzles; the positions of the oil nozzles correspond one-to-one with the through holes on the drive shaft sleeve.

[0013] Preferably, the transmission lead screw is a single-start trapezoidal lead screw with a threaded hole and a countersunk hole at the lower end; the threaded hole is fitted with an internal hexagonal head screw; and the lower end of the transmission lead screw also has a second optical shaft.

[0014] Preferably, the bottom of the housing is provided with 4 mounting holes.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects:

[0016] I. Long Effective Stroke: The power output method of this invention uses a transmission shaft sleeve to drive the transmission nut to rotate, causing the transmission screw to extend and retract. The effective length of the transmission screw is the total length of its trapezoidal thread section minus the length of the front support, transmission nut, and the optical shaft at the end of the transmission screw. The effective stroke accounts for more than 60% of the cylinder size. This is unmatched by electric servo cylinders, which only account for about 35%-40%. A long effective stroke means that compared with other products, the total length of the cylinder can be smaller for the same stroke requirements, thus significantly reducing the size and weight of the equipment and reducing the cost of medical equipment.

[0017] II. High Safety Factor: The transmission lead screw adopts a single-start trapezoidal lead screw, which can self-lock under certain impacts and vibrations. Furthermore, the lifting mechanism is equipped with internal mechanical hard limits to prevent the transmission lead screw from going over its travel and disengaging, ensuring sufficient reliability and safety.

[0018] III. Easy Maintenance: This lifting mechanism is essentially maintenance-free, requiring only periodic addition of grease. Multiple grease fittings are located on the outer casing and housing, allowing operators to easily add grease from various positions, ensuring effective lubrication of all transmission components. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the external structure of one embodiment of the present invention;

[0020] Figure 2 This is a cross-sectional view of one embodiment of the present invention.

[0021] Reference numerals: 1. Lifting head; 2. Lead screw; 3. Graphite copper bushing; 4. Front support seat; 5. Dustproof ring; 6. Outer protective sleeve; 7. Transmission nut; 8. Oil nozzle; 9. Transmission shaft sleeve; 10. Transition flange; 11. Machine cover; 12. Housing; 13. Driven bevel gear; 14. Tapered roller bearing I; 15. Protective sleeve; 16. Protective sleeve; 18. Socket head cap screw; 20. Retaining ring; 21. Driven bevel gear; 22. Countersunk socket head cap screw I; 23. Reducer; 25. Tapered roller bearing II; 26. Socket head cap screw II; 28. Deep groove ball bearing; 29. ​​Motor; 30. Set screw. Detailed Implementation

[0022] Example 1

[0023] like Figure 1-2As shown, the present invention proposes a lifting mechanism for medical devices, comprising a drive unit, a transmission unit, and a lifting unit. The drive unit includes a motor 29 and a reducer 23 that cooperate with each other. The transmission unit includes a driving bevel gear 21, a driven bevel gear 13, a transition flange 10, a cover 11, a housing 12, an outer protective sleeve 6, a front support 4, a transmission nut 7, a transmission shaft sleeve 9, a protective sleeve 15, and a protective sleeve 16; the front support 4, outer protective sleeve 6, transition flange 10, cover 11, housing 12, protective sleeve 15, and protective sleeve 16 are connected sequentially from top to bottom to form a transmission chamber; the transmission shaft sleeve 9 is rotatably disposed in the transmission chamber; the driven bevel gear 13 is keyed to the lower end of the transmission shaft sleeve 9; the driving bevel gear 21 is keyed to the reduction end of the reducer 23 and extends into the transmission chamber to mesh with the driven bevel gear 13; the transmission nut 7 is disposed at the upper end of the transmission shaft sleeve 9 and is rotatably connected to the front support 4. The lifting part includes a transmission screw 2 and a lifting head 1; the transmission screw 2 is rotatably mounted in the transmission shaft sleeve 9, and its upper end is threadedly engaged with the transmission nut 7; the lifting head 1 extends out of the transmission chamber, its lower end is connected to the top of the transmission screw 2, and its upper end is provided with an inner hole for connecting an external pin.

[0024] Example 2

[0025] like Figure 1-2 As shown, the present invention proposes a lifting mechanism for medical devices, comprising a drive unit, a transmission unit, and a lifting unit. The drive unit includes a motor 29 and a reducer 23 that cooperate with each other. The transmission unit includes a driving bevel gear 21, a driven bevel gear 13, a transition flange 10, a cover 11, a housing 12, an outer protective sleeve 6, a front support 4, a transmission nut 7, a transmission shaft sleeve 9, a protective sleeve 15, and a protective sleeve 16; the front support 4, outer protective sleeve 6, transition flange 10, cover 11, housing 12, protective sleeve 15, and protective sleeve 16 are connected sequentially from top to bottom to form a transmission chamber; the transmission shaft sleeve 9 is rotatably disposed in the transmission chamber; the driven bevel gear 13 is keyed to the lower end of the transmission shaft sleeve 9; the driving bevel gear 21 is keyed to the reduction end of the reducer 23 and extends into the transmission chamber to mesh with the driven bevel gear 13; the transmission nut 7 is disposed at the upper end of the transmission shaft sleeve 9 and is rotatably connected to the front support 4. The lifting part includes a transmission screw 2 and a lifting head 1; the transmission screw 2 is rotatably mounted in the transmission shaft sleeve 9, and its upper end is threadedly engaged with the transmission nut 7; the lifting head 1 extends out of the transmission chamber, its lower end is connected to the top of the transmission screw 2, and its upper end is provided with an inner hole for connecting an external pin.

[0026] Furthermore, the reducer 23 is an angle planetary reducer, which is connected to the drive bevel gear 21 via a flat key.

[0027] Furthermore, a retaining ring 20 is provided at the front end of the drive bevel gear 21, and the two are connected by a countersunk hexagon socket screw 22 to restrict its axial movement. An adjusting washer is provided at the rear end of the drive bevel gear 21 to adjust the installation distance of the gear, thereby adjusting the gear clearance.

[0028] Furthermore, the driven bevel gear 13 is connected to the transmission shaft sleeve 9 via a double flat key.

[0029] Furthermore, the lifting head 1 is fixedly connected to the upper end of the transmission screw 2 via fine thread and set screw 30.

[0030] Furthermore, the front support seat 4 is provided with an inner hole; a bearing seat and a groove are provided at the lower end of the inner hole; a deep groove ball bearing 28 is installed on the bearing seat; the transmission nut 7 is rotatably connected to the front support seat 4 through the deep groove ball bearing 28; the deep groove ball bearing 28 supports the operation of the transmission nut 7. A dustproof ring 5 is provided on the groove to prevent external dust from entering the cylinder body; a graphite copper sleeve 3 is inlaid at the upper end of the inner hole; the graphite copper sleeve 3 and the transmission screw 2 are clearance-fitted, with a clearance of 0.05-0.1mm, which guides the movement of the transmission screw 2.

[0031] Furthermore, the upper end of the transmission nut 7 is provided with a boss with a light shaft; the light shaft and the deep groove ball bearing 28 are clearance fit, with a clearance of 0.03-0.05mm; the lower end of the transmission nut 7 is provided with a stop that mates with the transmission shaft sleeve 9, and is connected to the transmission shaft sleeve 9 by an internal hexagon screw 26.

[0032] Furthermore, the bottom of the transmission shaft sleeve 9 is provided with a bearing seat two, and the middle is provided with a bearing seat three; a tapered roller bearing one 14 is provided on the bearing seat two; a tapered roller bearing two 25 is provided on the bearing seat three; the transmission shaft sleeve 9 is rotatably connected to the housing 12 through the tapered roller bearing one 14, and rotatably connected to the machine cover 11 through the tapered roller bearing two 25.

[0033] Furthermore, the outer casing 6 is machined using a standard cylinder barrel, and the outer wall of the cylinder barrel is provided with heat dissipation grooves and four grease nipples 8; the positions of the grease nipples 8 correspond one-to-one with the through holes on the transmission shaft sleeve 9; this facilitates the smooth arrival of grease at the thread of the transmission screw 2 when adding grease.

[0034] Furthermore, the transmission screw 2 is a single-ended trapezoidal screw with a threaded hole and a countersunk hole at the lower end. After applying thread-locking adhesive to the threaded hole, an internal hexagon head screw 18 is installed. After the thread-locking adhesive cures, the internal hexagon head screw 18 connects to the transmission screw 2, which facilitates the use of a pneumatic wrench when assembling the transmission screw 2. A second optical shaft is also provided at the lower end of the transmission screw 2. This shaft will contact the transmission nut 7 after the transmission screw 2 has traveled its stroke, preventing the transmission screw 2 from disengaging from the cylinder body; this is a mechanical hard limit.

[0035] Furthermore, the bottom of the housing 12 is provided with four mounting holes for mounting the lifting mechanism on the equipment.

[0036] The working principle of this invention is as follows: After the motor 29 is powered on, the main shaft first drives the reducer 23 to rotate, reducing the speed of the drive end and increasing the output torque. Then, the driving bevel gear 21 is connected to the reducer 23 via a key. The driven bevel gear 13 and the driving bevel gear 21 form a gear pair, further amplifying the torque. The driven bevel gear 13 is also connected to the transmission shaft sleeve 9 via a double key, driving the transmission shaft sleeve 9 to rotate synchronously. The end of the transmission nut 7 has a stop that mates with the transmission shaft sleeve 9 and is connected to the transmission shaft sleeve 9 via an internal hexagonal screw 26. Therefore, the transmission nut 7 rotates synchronously with the transmission shaft sleeve 9. At the same time, the transmission screw 2 and the transmission nut 7 form a threaded pair. For every revolution of the transmission nut 7, the transmission screw 2 is displaced by one pitch. The lower end of the lifting head 1 is fixed to the transmission screw 2 via a fine thread and a set screw 30, and its upper end is connected to the pin. By controlling the number of revolutions and the direction of rotation of the main shaft of the motor 29, the lifting head 1 can drive the pin to perform quantitative displacement.

[0037] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A lifting mechanism specifically for medical devices, characterized in that, It includes a drive unit, a transmission unit, and a lifting unit; The drive unit includes a motor (29) and a reducer (23) that work together. The transmission unit includes a driving bevel gear (21), a driven bevel gear (13), a transition flange (10), a cover (11), a housing (12), an outer sleeve (6), a front support seat (4), a transmission nut (7), a transmission shaft sleeve (9), a sleeve sleeve (15), and a protective sleeve (16). The front support seat (4), outer sleeve (6), transition flange (10), cover (11), housing (12), sleeve sleeve (15), and protective sleeve (16) are connected sequentially from top to bottom to form a transmission chamber. The transmission shaft sleeve (9) is rotatably mounted in the transmission chamber. The driven bevel gear (13) is keyed to the lower end of the transmission shaft sleeve (9). The driving bevel gear (21) is keyed to the reduction end of the reducer (23) and extends into the transmission chamber to mesh with the driven bevel gear (13). The transmission nut (7) is mounted on the upper end of the transmission shaft sleeve (9) and is rotatably connected to the front support seat (4). The lifting part includes a transmission screw (2) and a lifting head (1); the transmission screw (2) is rotatably disposed in the transmission shaft sleeve (9), and its upper end is threadedly engaged with the transmission nut (7); the lifting head (1) extends out of the transmission chamber, its lower end is connected to the top of the transmission screw (2), and its upper end is provided with an inner hole for connecting an external pin. The front support seat (4) is provided with an inner hole; a bearing seat and a groove are provided at the lower end of the inner hole; a deep groove ball bearing (28) is installed on the bearing seat; the transmission nut (7) is rotatably connected to the front support seat (4) through the deep groove ball bearing (28); a dustproof ring (5) is provided on the groove; a graphite copper sleeve (3) is inlaid at the upper end of the inner hole; the graphite copper sleeve (3) and the transmission screw (2) are clearance-fitted, and the clearance is 0.05-0.1mm; The upper end of the transmission nut (7) is provided with a boss with a light shaft; the light shaft and the deep groove ball bearing (28) are in clearance fit with a clearance of 0.03-0.05mm; the lower end of the transmission nut (7) is provided with a stop that fits with the transmission shaft sleeve (9), and is connected to the transmission shaft sleeve (9) by an internal hexagon screw (26). The outer casing (6) is machined using a standard cylinder barrel. The outer wall of the cylinder barrel is provided with heat dissipation grooves and four oil nozzles (8). The positions of the oil nozzles (8) correspond one-to-one with the through holes on the transmission shaft sleeve (9).

2. The medical device-specific lifting mechanism according to claim 1, characterized in that, The reducer (23) is a rotary planetary reducer, which is connected to the drive bevel gear (21) via a flat key.

3. The medical device-specific lifting mechanism according to claim 1, characterized in that, The front end of the drive bevel gear (21) is provided with a retaining ring (20), and the two are connected by a countersunk hexagonal screw (22). The rear end of the drive bevel gear (21) is provided with an adjusting washer.

4. The medical device-specific lifting mechanism according to claim 1, characterized in that, The driven bevel gear (13) is connected to the transmission shaft sleeve (9) by a double flat key.

5. A lifting mechanism for medical devices according to claim 1, characterized in that, The lifting head (1) is fixed to the upper end of the transmission screw (2) through fine thread and set screw (30).

6. A lifting mechanism for medical devices according to claim 1, characterized in that, The bottom of the transmission shaft sleeve (9) is provided with bearing seat 2 and the middle is provided with bearing seat 3; a tapered roller bearing 1 (14) is provided on bearing seat 2; a tapered roller bearing 2 (25) is provided on bearing seat 3; the transmission shaft sleeve (9) is rotatably connected to the housing (12) through tapered roller bearing 1 (14) and rotatably connected to the machine cover (11) through tapered roller bearing 2 (25).

7. A lifting mechanism for medical devices according to claim 1, characterized in that, The lower end of the transmission screw (2) is provided with a threaded hole and a countersunk hole; the threaded hole is fitted with an internal hexagonal head screw (18); the lower end of the transmission screw (2) also has a light shaft.

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