Motor gear box output shaft for medical instrument and manufacturing process of motor gear box output shaft

Abstract

The invention discloses a motor gear box output shaft for medical equipment and a manufacturing process thereof, and the motor gear box output shaft comprises the following components in percentage by mass: 2.67%-3.27% of Cr, 0.54%-0.66% of C, 0.44%-0.55% of Mo, 0.45%-0.55% of Lu and the balance of Fe. When the output shaft is operated mistakenly or the torque is larger than a threshold value, the disc face part is broken along the planet pin hole of the planet carrier, power output between the motor and the output shaft can be automatically cut off at the moment, and a tool bit and the weak part of a cutting instrument are protected.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors for medical devices, and in particular relates to an output shaft of a motor gearbox for medical devices and a manufacturing process thereof. Background Art

[0002] During surgery, doctors often use medical staplers to shear metal parts or calcified tissues, so the cutting head is subjected to a very large load during shearing. However, ordinary carbon brush motor reducers have very large torque and continuous output torque, and cannot be stopped or reduced in time according to the load conditions. Therefore, when the cutter head reaches its ultimate tensile strength, the cutter head will break, and the broken blade may splash into the abdominal cavity or other parts of the operation, causing medical accidents. Surgeons usually adjust the speed to reduce the risk of cutter head breakage, but the shearing efficiency will become very low, resulting in extended surgery time. Therefore, a reducer that can sense torque within a limited gun space and at a very low cost, and in the case of abnormal operation, the gearbox cuts off the power output to protect the cutter head, is needed to avoid medical accidents. Summary of the invention

[0003] The present invention mainly solves the problem of being able to sense torque changes and automatically cut off the power output of the gear box in a limited firearm space at a very low cost, thereby protecting the cutter head from breaking.

[0004] In order to solve the above technical problems, a technical solution adopted by the present invention is as follows:

[0005] An output shaft of a motor gearbox for medical equipment comprises the following components by mass percentage: Cr: 2.67%-3.27%, C: 0.54%-0.66%, Mo: 0.44%-0.55%, Lu: 0.45%-0.55%, and the rest is Fe.

[0006] Furthermore, the output shaft manufacturing process includes the following steps:

[0007] S1): Mix the powders of the ingredients in proportion at a temperature of 25-35° C. to obtain a premix;

[0008] S2): The premix is ​​pressed and molded to reduce the output shaft surface density to 6.3-6.4 g / cm 3 ;

[0009] S3): Place the product into a powder metallurgy sintering furnace for sintering, and the sintering furnace belt speed is 7-9cm / min;

[0010] S4): After sintering for four hours, enter the slow cooling zone, wherein the temperature of the first section during sintering is 600-650°C, the temperature of the second section is 900-950°C, the temperature of the third section is 1000-1100°C, the temperature of the fourth section is 1000-1130°C, the temperature of the fifth section is 1000-1130°C, and the temperature of the sixth section is 1000-1130°C;

[0011] S5): Take out after cooling in the slow cooling zone for two hours, the temperature of the slow cooling zone is 25-35°C;

[0012] S6): Press riveting: riveting the pins used to install the planetary gears to the output shaft disc surface;

[0013] S7): Bonding: bonding the disc surface and the output shaft;

[0014] S8): Anti-rust treatment.

[0015] Furthermore, in step 4, protective gas is introduced throughout the sintering process, and the protective gas is nitrogen with a flow rate of 10NM 3 / H, the protective gas flow rate at the front end of the sintering furnace is 1NM 3 / H, the rear protection gas flow is 2NM 3 / H.

[0016] Furthermore, 5NM 3 / H decomposition of ammonia and 10NM 3 / H of propane protective gas.

[0017] Furthermore, in step 7, the glue model used is Loctite 648.

[0018] Beneficial effects of the present invention:

[0019] The output shaft disc part of the present invention adopts powder metallurgy technology, and designs the powder metallurgy manufacturing process to ensure that its density and strength reach a suitable level. During normal operation and suturing, there is enough torque in the entire use process, and no breakage will occur. When the operation is wrong or the torque is greater than the threshold, the disc part will break along the planetary pin hole of the planetary frame, and the power output between the motor and the output shaft will be automatically cut off at this time, protecting the weak parts of the cutter head and the cutting instrument.

[0020] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the output shaft structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the output shaft;

[0023] Description of reference numerals:

[0024] 1. Motor; 2. Reduction gearbox; 3. Output shaft; 31. Output shaft end face. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention. Specific embodiment 1:

[0027] An output shaft of a motor gearbox for medical equipment comprises the following components by mass percentage: Cr: 3%, C: 0.6%, Mo: 0.5%, Lu: 0.5%, and the rest is Fe. Specific embodiment 2:

[0029] The invention discloses an output shaft of a motor gearbox for medical equipment, which comprises the following components by mass percentage: Cr: 3%, C: 0.5%, Mo: 0.5%, Lu: 0.5%, and the rest is Fe. Specific embodiment 3:

[0031] The invention discloses an output shaft of a motor gearbox for medical equipment, which comprises the following components by mass percentage: Cr: 3.5%, C: 0.5%, Mo: 0.5%, Lu: 0.5%, and the rest is Fe. Specific embodiment 4:

[0033] The invention discloses an output shaft of a motor gearbox for medical equipment, which comprises the following components by mass percentage: Cr: 3.5%, C: 0.6%, Mo: 0.5%, Lu: 0.5%, and the rest is Fe. Specific embodiment 5:

[0035] The invention discloses an output shaft of a motor gearbox for medical equipment, which comprises the following components by mass percentage: Cr: 1%, C: 0.45%, Mo: 0.5%, Lu: 0.5%, and the rest is Fe.

[0036] Specifically, the above embodiments are manufactured according to the following steps:

[0037] S1): Mix the powders of the ingredients in proportion at a temperature of 25-35° C. to obtain a premix;

[0038] S2): The premix is ​​pressed and molded to reduce the output shaft surface density to 6.3-6.4 g / cm 3 ;

[0039] S3): Place the product into a powder metallurgy sintering furnace for sintering, and the sintering furnace belt speed is 7-9cm / min;

[0040] S4): After sintering for four hours, enter the slow cooling zone, wherein the temperature of the first section during sintering is 600-650°C, the temperature of the second section is 900-950°C, the temperature of the third section is 1000-1100°C, the temperature of the fourth section is 1000-1130°C, the temperature of the fifth section is 1000-1130°C, and the temperature of the sixth section is 1000-1130°C; specifically, in the step 4, protective gas is introduced throughout the sintering process, and the protective gas is nitrogen with a flow rate of 10NM 3 / H, the protective gas flow rate at the front end of the sintering furnace is 1NM 3 / H, the rear protection gas flow is 2NM 3 / H. Specifically, 5NM 3 / H decomposition of ammonia and 10NM 3 / H of propane protective gas.

[0041] S5): Take out after cooling in the slow cooling zone for two hours, the temperature of the slow cooling zone is 25-35°C;

[0042] S6): Press riveting: riveting the pins used to install the planetary gears to the output shaft disc surface;

[0043] S7): Bonding: bonding the disk surface and the output shaft; specifically, in step 7, the glue model used is Loctite 648.

[0044] S8): Anti-rust treatment.

[0045] According to the above embodiment ratio, the test report is as follows:

[0046]

[0047] By comparison, it can be seen that Example 1 is the optimal ratio.

[0048] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An output shaft of a motor gearbox for medical equipment, characterized in that: The composition thereof includes the following components by mass percentage: Cr: 2.67% to 3.27%, C: 0.54% to 0.66%, Mo: 0.44% to 0.55%, Lu: 0.45% to 0.55%, and the rest is Fe.

2. The manufacturing process of the output shaft of the motor gearbox for medical equipment according to claim 1, characterized in that: The following steps are involved: S1): Mix the powders of the ingredients in proportion at a temperature of 25 to 35° C. to obtain a premix; S2): The premix is ​​pressed and molded to reduce the output shaft surface density to 6.3-6.4 g / cm 3 ; S3): Place the product into a powder metallurgy sintering furnace for sintering, and the sintering furnace belt speed is 7-9 cm / min; S4): After sintering for four hours, enter the slow cooling zone, wherein the temperature of the first stage during sintering is 600-650°C, the temperature of the second stage is 900-950°C, the temperature of the third stage is 1000-1100°C, the temperature of the fourth stage is 1000-1130°C, the temperature of the fifth stage is 1000-1130°C, and the temperature of the sixth stage is 1000-1130°C; S5): Take out after cooling in a slow cooling zone for two hours, the temperature of the slow cooling zone is 25-35°C; S6): Press riveting: riveting the pins used to install the planetary gears to the output shaft disc surface; S7): Bonding: bonding the disc surface and the output shaft; S8): Anti-rust treatment.

3. The manufacturing process of the output shaft of the motor gearbox for medical equipment according to claim 2, characterized in that: In step 4, protective gas is introduced throughout the sintering process, and the protective gas is nitrogen with a flow rate of 10NM 3 / H, the protective gas flow rate at the front end of the sintering furnace is 1NM 3 / H, the rear protection gas flow is 2NM 3 / H.

4. The manufacturing process of the output shaft of the motor gearbox for medical equipment according to claim 3, characterized in that: The sintering furnace also introduced 5NM 3 / H decomposition of ammonia and 10NM 3 / H of propane, the decomposed ammonia is used to reduce the surface oxidation degree of the material, and the propane is used to increase the hardness.

5. The manufacturing process of the output shaft of the motor gearbox for medical equipment according to claim 2, characterized in that: In step 7, the glue model used is Loctite 648.

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