Novel medical reverse driving mechanism

Abstract

The utility model provides a novel medical reverse drive mechanism, which relates to the technical field of medical speed reduction equipment, and comprises an RV speed reducer and a reverse drive assembly connected with the RV speed reducer, the RV speed reducer comprises a pin wheel housing, an output shaft, an output end cover, at least two eccentric shafts and a cycloidal gear; the end, away from the output shaft, of the output end cover is provided with an input shaft, and the end, close to the input shaft, of the eccentric shaft is provided with a planet wheel. The reverse driving assembly comprises a reverse driving flange which is arranged at the end, away from the output shaft, of the input shaft and detachably and fixedly connected with the pin wheel housing, a magnetic suction cup located between the eccentric shaft and the reverse driving flange is detachably and fixedly installed on the input shaft, and a plurality of first permanent magnets matched with the magnetic suction cup are arranged on the side, close to the magnetic suction cup, of the reverse driving flange in a circumferential array mode. Lifting driving of the instrument supporting table can be achieved without using a motor and only with small reverse thrust, the position of the instrument supporting table can be fixed at any time, and load balance of the instrument supporting table is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of medical deceleration equipment technology, and in particular to a novel medical reverse drive mechanism. Background Technology

[0002] In medical surgery, a support platform is commonly used to hold surgical instruments. To facilitate the placement and retrieval of instruments and avoid interfering with the surgical procedure, the platform needs to be able to swing and rise. Current technology typically uses a motor, braking device, and reducer to achieve the swinging, rising, and fixing of the platform. This structure is large, heavy, complex, and has poor stability, and is increasingly unable to meet the miniaturization and safety requirements of medical equipment. Utility Model Content

[0003] The purpose of this invention is to provide a novel medical reverse drive mechanism that can achieve the lifting and lowering of the instrument tray without the need for a motor and with only a small reverse thrust. It can also fix the position of the instrument tray at any time to ensure the load balance of the instrument tray. The structure is simpler and the operation is more convenient and labor-saving.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0005] A novel medical reverse drive mechanism includes an RV reducer and a reverse drive assembly connected to the RV reducer. The RV reducer includes a pin gear housing, an output shaft, an output end cover, and at least two eccentric shafts arranged in a circumferential array. Cycloidal wheels that mesh with the pin gear housing via needle rollers are respectively mounted on two cams of the eccentric shafts. An input shaft is provided at the end of the output end cover away from the output shaft. A planetary gear is mounted at the end of the eccentric shaft near the input shaft. An input gear that meshes with the planetary gear is provided at the end of the input shaft near the planetary gear.

[0006] The reverse drive assembly includes a reverse drive flange disposed at the end of the input shaft away from the output shaft. The reverse drive flange and the pin tooth housing are detachably and fixedly connected. A magnetic chuck located between the eccentric shaft and the reverse drive flange is detachably and fixedly installed on the input shaft. A plurality of permanent magnets cooperating with the magnetic chuck are arranged in a circumferential array on the side of the reverse drive flange near the magnetic chuck.

[0007] By adopting the above technical solution, the needle-tooth shell serves as the fixed end. The frictional force generated by the magnetic attraction between the permanent magnet on the reverse drive flange and the magnetic chuck directly replaces the motor as the reverse drive force of the RV reducer. The speed ratio is amplified through the two-stage transmission of the RV reducer. This way, the output shaft requires a large torque to push, while the pushing force applied by the person only needs to be the difference between the reverse drive force of the RV reducer and the weight of the instrument platform. Only a small driving force is needed to manually raise and lower the instrument platform, which is convenient and labor-saving, and effectively simplifies the structure of the entire reverse drive mechanism, meeting the requirements of miniaturization. Since the weight of the instrument platform is always less than the reverse drive force of the RV reducer, the position of the instrument platform can be fixed at any time, achieving load balance of the instrument platform and improving safety.

[0008] Furthermore, the magnetic chuck is an iron disc, and the magnetic chuck and the permanent magnet do not contact each other on their adjacent sides.

[0009] By adopting the above technical solution, the magnetic chuck is an iron disc, made directly from a material that can generate magnetic attraction with the permanent magnet, and the side of the chuck that is close to the permanent magnet does not contact it. This ensures that the input shaft can drive the magnetic chuck to rotate normally, while using the magnetic friction between the two as the counter-drive force of the RV reducer, replacing the motor and simplifying the structure.

[0010] Furthermore, the magnetic chuck is an aluminum disc, and a plurality of permanent magnets are arranged in a circular array on the side of the aluminum disc near the reverse drive flange, which are attracted to and cooperate with the first permanent magnet.

[0011] By adopting the above technical solution, the magnetic chuck is an aluminum disc made of a material that does not generate magnetic attraction with the first permanent magnet. Several second permanent magnets that cooperate with and attract the first permanent magnet are embedded on the aluminum disc. The force generated between the first permanent magnet and the second permanent magnet is greater. This structure can obtain a greater reverse thrust without changing the volume of the RV reducer, and can be used for a wider load range, which can meet the needs of larger instrument trays.

[0012] Furthermore, each of the permanent magnets is connected to an adjusting screw at the end away from the magnetic chuck. The reverse drive flange is provided with a plurality of adjusting holes arranged in a circumferential array, which penetrate its axial direction and cooperate with the corresponding permanent magnet and adjusting screw. The adjusting screw is threadedly connected to the corresponding adjusting hole.

[0013] By adopting the above technical solution, by changing the different thread connection depths of the adjusting screw and the adjusting hole, the permanent magnet is moved, and the axial clearance between the permanent magnet and the magnetic chuck is adjusted to obtain different magnetic attraction forces. That is, with the volume of the RV reducer unchanged, the required magnitude of the reverse driving force is obtained by adjusting the magnetic attraction force between the permanent magnet and the magnetic chuck, so that the reverse driving force is adapted to the instrument tray with different loads. This ensures that the instrument tray can be stopped and put into balance at any time, while only a small thrust is needed to push the instrument tray up and down, effectively improving the applicability of the entire reverse driving mechanism.

[0014] Furthermore, support bearings are respectively provided between the outer walls of both ends of the input shaft and the inner holes of the output end cover and the reverse drive flange. The inner and outer rings of the support bearings near the output end cover abut against the output end cover and the input gear, respectively, and the inner and outer rings of the support end cover near the reverse drive flange abut against the reverse drive flange and the magnetic chuck, respectively.

[0015] By adopting the above technical solution, the input shaft is supported by two support bearings, and the axial positioning of the input shaft is achieved through the output shaft cover, input gear engagement, magnetic chuck, reverse drive flange, and the engagement of the two support bearings, thus ensuring the stability of the input shaft installation and operation.

[0016] Furthermore, the RV reducer is provided with a hollow conduit coaxially arranged therewith, and the output shaft is fitted with a limiting retaining ring that abuts against the hollow conduit at one end. The output shaft is also provided with a limiting step that cooperates with the hollow conduit, and the end of the hollow conduit away from the output shaft extends into the inner hole of the reverse drive flange and is coaxially arranged therewith.

[0017] By adopting the above technical solution, a hollow conduit is installed in the RV reducer to facilitate the installation of cables, and the limiting ring and limiting step realize the axial limiting of the hollow conduit.

[0018] Furthermore, a first skeleton sealing ring is provided between the needle tooth housing and the output shaft, an oil seal is provided on the output shaft to cooperate with the end of the eccentric shaft away from the planetary gear, an O-ring is provided between the needle tooth housing and the reverse drive flange, and a second skeleton sealing ring is provided between the reverse drive flange and the hollow conduit.

[0019] By adopting the above technical solution, the first skeleton sealing ring achieves the seal between the needle tooth housing and the output shaft, the oil seal achieves the seal between the output shaft and the end of the eccentric shaft, the O-ring seal achieves the seal between the needle tooth housing and the reverse drive flange, and the second skeleton sealing ring achieves the seal between the reverse drive flange and the hollow conduit. In this way, the first skeleton sealing ring, the oil seal, the O-ring seal, and the second skeleton sealing ring achieve the full sealing of the entire reverse drive mechanism, ensuring the safety and service life of the reverse drive mechanism.

[0020] Furthermore, mounting bearings are provided between the needle tooth housing, the output shaft, and the output end cover, and an adjustment ring is provided between the mounting bearing corresponding to the output end cover and the side away from the cycloidal wheel.

[0021] By adopting the above technical solution, the mounting bearing realizes the installation connection between the pin tooth housing, the output shaft and the output end cover. The adjustment ring can adjust the axial clearance between the two mounting bearings, ensuring the performance and service life of the mounting bearing.

[0022] In summary, this utility model has the following beneficial effects:

[0023] 1. In this utility model, an RV reducer and a reverse drive assembly that works with the RV reducer are provided. The reverse drive assembly includes a reverse drive flange mounted on the needle tooth housing, a magnetic chuck mounted on the input shaft, and a permanent magnet mounted on the reverse drive flange that works with the magnetic chuck. The needle tooth housing serves as the fixed end. The friction force generated by the magnetic attraction between the permanent magnet and the magnetic chuck on the reverse drive flange directly replaces the motor as the reverse drive force of the RV reducer. The pushing force applied by the person only needs to be the difference between the reverse drive force of the RV reducer and the weight of the instrument platform. Only a small reverse drive force is needed to manually raise and lower the instrument platform. The position of the instrument platform can also be fixed at any time to ensure the load balance of the instrument platform. The structure is simpler, the operation is more convenient and labor-saving, and it meets the needs of medical equipment for miniaturization and safety.

[0024] 2. In this utility model, the magnetic chuck can be set as an aluminum disc with embedded permanent magnet II. This results in a larger force generated between permanent magnet I and permanent magnet II, which can obtain a larger reverse thrust without changing the volume of the RV reducer. The load range is wider and can meet the needs of larger instrument trays.

[0025] 3. In this utility model, the permanent magnet is connected to an adjusting screw. The permanent magnet can be moved by adjusting the screw, and the axial gap between the permanent magnet and the magnetic chuck can be adjusted to obtain different magnetic attraction forces. That is, with the volume of the RV reducer unchanged, the required amount of reverse driving force can be obtained by adjusting the magnetic attraction force between the permanent magnet and the magnetic chuck. This allows the reverse driving force to be adapted to the instrument trays with different loads, ensuring that the instrument trays can be stopped and put into balance. At the same time, only a small thrust is needed to push the instrument trays up and down, effectively improving the applicability of the entire reverse driving mechanism. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of a new type of medical reverse-drive mechanism, used to show that the magnetic chuck is an iron disc;

[0027] Figure 2 This is a schematic diagram of the overall structure of a new type of medical reverse-drive mechanism, used to show that the magnetic chuck is made of aluminum.

[0028] In the diagram, 01 is the RV reducer; 02 is the reverse drive assembly; 1 is the needle gear housing; 2 is the output shaft; 3 is the output end cover; 4 is the eccentric shaft; 5 is the needle roller; 6 is the cycloidal wheel; 7 is the input shaft; 8 is the planetary gear; 9 is the input gear; 10 is the reverse drive flange; 11 is the magnetic chuck; 12 is the first permanent magnet; 13 is the second permanent magnet; 14 is the adjusting screw; 15 is the adjusting hole; 16 is the support bearing; 17 is the hollow conduit; 18 is the limit retaining ring; 19 is the limit step; 20 is the first skeleton seal ring; 21 is the oil seal; 22 is the O-ring seal; 23 is the second skeleton seal ring; 24 is the mounting bearing; and 25 is the adjusting ring. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0030] A new type of medical anti-reverse mechanism, such as Figure 1 As shown, the device includes an RV reducer 01 and a reverse drive assembly 02 connected to the RV reducer 01. The basic structure of the RV reducer 01 is similar to that in the prior art, including a pin gear housing 1, an output shaft 2, an output end cover 3, and at least two eccentric shafts 4 arranged in a circumferential array. Cycloidal wheels 6, which mesh with the pin gear housing 1 via needle rollers 5, are respectively mounted on two cams of the eccentric shafts 4. An input shaft 7 is provided at the end of the output end cover 3 away from the output shaft 2. A planetary gear 8 is mounted at the end of the eccentric shaft 4 near the input shaft 7, and an input gear 9 that meshes with the planetary gear 8 is provided at the end of the input shaft 7 near the planetary gear 8.

[0031] Among them, such as Figure 1 As shown, mounting bearings 24 are provided between the needle housing 1, the output shaft 2, and the output end cover 3. An adjusting ring 25 is provided between the side of the mounting bearing 24 corresponding to the output end cover 3 away from the cycloidal wheel 6 and the output end cover 3. The axial clearance between the two mounting bearings 24 can be adjusted using the adjusting ring 25 to ensure the performance and service life of the mounting bearings 24.

[0032] like Figure 1 As shown, the reverse drive assembly 02 includes a reverse drive flange 10 disposed at the end of the input shaft 7 away from the output shaft 2. The reverse drive flange 10 and the pin tooth housing 1 are detachably fixedly connected by screws. A magnetic chuck 11 located between the eccentric shaft 4 and the reverse drive flange 10 is detachably fixedly mounted on the input shaft 7 by screws. A plurality of permanent magnets 12 that cooperate with the magnetic chuck 11 are arranged in a circular array on the side of the reverse drive flange 10 near the magnetic chuck 11.

[0033] like Figure 1 As shown, the needle-tooth shell 1 serves as the fixed end. The frictional force generated by the magnetic attraction between the permanent magnet 12 on the reverse drive flange 10 and the magnetic chuck 11 directly replaces the motor, acting as the reverse drive force for the RV reducer 01. The speed ratio is amplified through the two-stage transmission of the RV reducer 01. This means that a larger torque is required when the output shaft 2 is pushed, while the pushing force applied by the person only needs to be the difference between the reverse drive force of the RV reducer 01 and the weight of the instrument support. Only a small driving force is needed for purely manual lifting and lowering of the instrument support, saving time and effort, and effectively simplifying the structure of the entire reverse drive mechanism, meeting the requirements of miniaturization. Since the weight of the instrument support is always less than the reverse drive force of the RV reducer 01, the position of the instrument support can be fixed at any time, achieving load balance and improving safety.

[0034] Among them, such as Figure 1 and Figure 2 As shown, the magnetic chuck 11 can have two structures, one of which is as follows: Figure 1 The magnetic chuck 11 shown is an iron disc, made directly from a material that can generate magnetic attraction with the permanent magnet 12. The magnetic chuck 11 and the permanent magnet 12 do not contact each other on the side that is close to each other, ensuring that the input shaft 7 can drive the magnetic chuck 11 to rotate normally. At the same time, the magnetic friction between the two is used as the counter-drive force of the RV reducer 01 to replace the motor and simplify the structure.

[0035] Another one is like Figure 2 The magnetic chuck 11 shown is an aluminum disc, and on the side of the aluminum disc near the reverse drive flange 10, there is a circumferential array of several permanent magnets 13 that are attracted to and cooperate with permanent magnet 12. The sides of permanent magnets 12 and 13 that are close to each other do not contact each other. In this way, the magnetic chuck 11 is made of a material that does not generate magnetic attraction with permanent magnet 12, while several permanent magnets 13 that are attracted to and cooperate with permanent magnet 12 are embedded on the aluminum disc. The force generated between permanent magnet 12 and permanent magnet 13 is greater, so that a greater reverse thrust can be obtained without changing the volume of RV reducer 01, and a wider load range can be used to meet the needs of larger instrument trays.

[0036] To further expand the scope of application, such as Figure 1 or Figure 2 As shown, each permanent magnet 12 is connected to an adjusting screw 14 at the end away from the magnetic chuck 11. The reverse drive flange 10 has several adjusting holes 15 arranged in a circumferential array, penetrating its axial direction and cooperating with the corresponding permanent magnet 12 and adjusting screw 14. The adjusting screw 14 is threadedly connected to the corresponding adjusting hole 15. By changing the different thread depths of the adjusting screw 14 and the adjusting hole 15, the permanent magnet 12 is moved, adjusting the axial clearance between the permanent magnet 12 and the magnetic chuck 11 to obtain different magnetic attraction forces. That is, with the volume of the RV reducer 01 remaining constant, the required reverse drive force is obtained by adjusting the magnetic attraction force between the permanent magnet 12 and the magnetic chuck 11, making the reverse drive force adaptable to instrument trays with different loads. This ensures the instrument tray achieves a balanced state where it can stop and start instantly, while requiring only a small thrust to push the instrument tray up and down, effectively improving the applicability of the entire reverse drive mechanism.

[0037] like Figure 1As shown, to ensure the stability of the input shaft 7 during installation and operation, support bearings 16 are respectively provided between the outer walls of both ends of the input shaft 7 and the inner holes of the output end cover 3 and the reverse drive flange 10, thereby supporting the input shaft 7. In addition, the inner and outer rings of the support bearings 16 near the output end cover 3 abut against the output end cover 3 and the input gear 9, respectively, and the inner and outer rings of the support end cover near the reverse drive flange 10 abut against the reverse drive flange 10 and the magnetic chuck 11, respectively, thereby limiting the axial movement of the input shaft 7 and preventing the input shaft 7 from causing axial movement of the input gear 9 and the magnetic chuck 11.

[0038] like Figure 1 As shown, in this embodiment, the RV reducer 01 is further provided with a hollow cable conduit 17 coaxially arranged therewith. A limiting retaining ring 18 is embedded in the output shaft 2, abutting against one end of the hollow cable conduit 17. A limiting step 19, which cooperates with the hollow cable conduit 17, is also provided on the output shaft 2. The end of the hollow cable conduit 17 away from the output shaft 2 extends into the inner hole of the reverse drive flange 10 and is coaxially arranged therewith. The hollow cable conduit 17 in the RV reducer 01 facilitates cable routing, and the limiting retaining ring 18 and limiting step 19 provide axial limiting for the hollow cable conduit 17.

[0039] like Figure 1 As shown, to achieve a fully sealed reverse drive mechanism, a first skeleton seal ring 20 is provided between the pin housing 1 and the output shaft 2; an oil seal 21 is provided on the output shaft 2 to mate with the end of the eccentric shaft 4 away from the planetary gear 8; an O-ring seal 22 is provided between the pin housing 1 and the reverse drive flange 10; and a second skeleton seal ring 23 is provided between the reverse drive flange 10 and the hollow conduit 17. In this way, the first skeleton seal ring 20, the oil seal 21, the O-ring seal 22, and the second skeleton seal ring 23 achieve a fully sealed reverse drive mechanism, ensuring its safety and service life.

[0040] The working principle and usage of this utility model:

[0041] This invention utilizes the frictional force generated by the magnetic attraction between the permanent magnet 12 and the magnetic chuck 11 in the reverse drive assembly 02 to replace the motor as the reverse drive force of the RV reducer 01. The pushing force applied by the user only needs to be the difference between the reverse drive force of the RV reducer 01 and the weight of the instrument tray. Only a small reverse driving force is required for purely manual raising and lowering of the instrument tray, and the position of the instrument tray can be fixed at any time to ensure the load balance of the instrument tray. The gap between the permanent magnet 12 and the magnetic chuck 11 is adjustable to obtain different magnetic attraction forces. With the volume of the RV reducer 01 remaining unchanged, the required magnitude of the reverse drive force can be obtained by adjusting the magnetic attraction force between the permanent magnet 12 and the magnetic chuck 11, so that the reverse drive force can be adapted to the instrument tray with different loads. This ensures that the instrument tray can be stopped and raised or lowered with only a small pushing force, effectively improving the applicability of the entire reverse drive mechanism.

[0042] The foregoing description illustrates and describes preferred embodiments of the present invention. As previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or related technical or knowledge. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A new medical counter drive mechanism, characterized by: The application relates to an RV reducer (01) and a counter driving assembly (02) connected with the RV reducer (01), wherein the RV reducer (01) comprises a pin gear shell (1), an output shaft (2), an output end cover (3), at least two eccentric shafts (4) arranged in a circumferential array, and a cam follower (6) mounted on each of the two cams of the eccentric shaft (4) and engaged with the pin gear shell (1) through a needle roller (5); an input shaft (7) is arranged at the end of the output end cover (3) away from the output shaft (2); a planetary gear (8) is mounted on the end of the eccentric shaft (4) close to the input shaft (7); and an input gear (9) engaged with the planetary gear (8) is arranged at the end of the input shaft (7) close to the planetary gear (8). The counter driving assembly (02) comprises a counter driving flange (10) arranged at the end of the input shaft (7) away from the output shaft (2), the counter driving flange (10) and the pin gear shell (1) are detachably fixedly connected, the input shaft (7) is detachably fixedly provided with a magnetic suction disc (11) between the eccentric shaft (4) and the counter driving flange (10), and a plurality of permanent magnets I (12) matched with the magnetic suction disc (11) are arranged in a circumferential array on the side of the counter driving flange (10) close to the magnetic suction disc (11).

2. The novel medical anti-driving mechanism according to claim 1, characterized in that: The magnetic suction disc (11) is an iron disc, and the side of the magnetic suction disc (11) and the permanent magnet I (12) close to each other is not in contact.

3. The novel medical anti-driving mechanism according to claim 1, characterized in that: The magnetic suction disc (11) is an aluminum disc, and a plurality of permanent magnets II (13) matched with the permanent magnets I (12) and attracted to the permanent magnets I (12) are arranged in a circumferential array on the side of the aluminum disc close to the counter driving flange (10).

4. A novel medical counter drive mechanism according to claim 2 or 3, characterized in that: An adjusting screw (14) is connected to the end of each permanent magnet I (12) away from the magnetic suction disc (11), a plurality of adjusting holes (15) penetrating through the axial direction of the counter driving flange (10) and matched with the corresponding permanent magnet I (12) and adjusting screw (14) are arranged in a circumferential array on the counter driving flange (10), and the adjusting screw (14) is threadedly connected with the corresponding adjusting hole (15).

5. The novel medical backdrive mechanism according to claim 1, characterized in that: Support bearings (16) are arranged between the outer walls of the two ends of the input shaft (7) and the inner holes of the output end cover (3) and the counter driving flange (10), respectively, the inner and outer rings of the support bearing (16) close to the output end cover (3) abut against the output end cover (3) and the input gear (9), respectively, and the inner and outer rings of the support bearing (16) close to the counter driving flange (10) abut against the counter driving flange (10) and the magnetic suction disc (11), respectively.

6. The novel medical backdrive mechanism according to claim 1, characterized in that: A hollow wire passing pipe (17) coaxially arranged with the RV reducer (01) is arranged in the RV reducer (01), a limiting stop ring (18) abutting against the end of the hollow wire passing pipe (17) close to the RV reducer (01) is embedded in the output shaft (2), a limiting step (19) matched with the hollow wire passing pipe (17) is further arranged on the output shaft (2), and the end of the hollow wire passing pipe (17) away from the output shaft (2) is arranged in the inner hole of the counter driving flange (10) coaxially.

7. A novel medical anti-driving mechanism according to claim 6, characterized in that: The first skeleton seal ring (20) is arranged between the pin gear shell (1) and the output shaft (2), the oil seal (21) is arranged on the output shaft (2) and matched with the eccentric shaft (4) away from the planetary gear (8), the O-shaped seal ring (22) is arranged between the pin gear shell (1) and the counter driving flange (10), and the second skeleton seal ring (23) is arranged between the counter driving flange (10) and the hollow wire tube (17).

8. The novel medical backdrive mechanism according to claim 1, characterized in that: The mounting bearing (24) is arranged between the pin gear shell (1) and the output shaft (2) and the output end cover (3), and the adjusting ring (25) is arranged between the side of the mounting bearing (24) corresponding to the output end cover (3) and the output end cover (3) and away from the cycloid gear (6).

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