A new type of drive shaft mechanism

Abstract

This utility model relates to a novel transmission shaft mechanism, including a support base, an outer shaft, and an inner shaft. The key technical features are: a magnetic fluid seal is provided on the support base to mate with the outer shaft; one end of the inner shaft passes sequentially through the mandrel of the magnetic fluid seal, a rotary sealing structure, and a conductive slip ring, with the inner shaft and mandrel fixed as one unit; the other end of the inner shaft leads out to the outer shaft and is connected to a bearing between them; the inner shaft is hollow and has an inner water jacket on its inner wall; the rotary sealing structure communicates with the inner water jacket; an outer water jacket is provided on the inner wall of the outer shaft; a thermocouple passes through the inner shaft; the conductive slip ring is electrically connected to the thermocouple; the bottom of the support base is connected and fixed to the slider of a linear module; a driven pulley is fixed to the exposed end of the mandrel of the magnetic fluid seal; a drive motor reducer is fixed to the outer wall of the magnetic fluid seal; and a drive pulley connected to the driven pulley is provided on the output end of the drive motor reducer. This mechanism has good sealing performance, good water cooling effect, and long service life.

Description

Technical Field

[0001] This utility model relates to the field of transmission shaft technology for connecting the power sources inside and outside a vacuum chamber, and specifically to a novel transmission shaft mechanism. Background Technology

[0002] With the continuous maturation of vacuum metallurgy and vacuum heat treatment processes, corresponding ultra-high vacuum furnaces are also developing towards greater economy, scale, and size. In the field of vacuum metallurgy and vacuum heat treatment, the drive shaft, as a core component connecting the power inside and outside the vacuum chamber and realizing material conveying or tooling movement, has always focused its technological development on reliability and process adaptability under extreme environments. The molten metal and precision alloy workpieces in vacuum metallurgy, as well as the high-cleanliness parts (such as aerospace components and semiconductor materials) in vacuum heat treatment, are extremely sensitive to impurities. The lubrication and sealing system of the drive shaft must not generate volatiles, particles, or oil stains, otherwise it will contaminate the workpiece surface or the melt, leading to product scrap. The dynamic seal between the drive shaft and the vacuum chamber is the core technology, which must simultaneously meet the dual requirements of "rotational / reciprocating motion" and "high vacuum sealing".

[0003] However, existing technologies have the following problems: 1. When the main shaft of a conventional drive shaft rotates, it is easy to cause friction damage to the sealing ring that comes into contact with it, which greatly reduces the sealing performance.

[0004] 2. The conventional drive shaft structure of the spindle does not have a good water cooling effect in a vacuum high-temperature environment, which can easily damage the spindle's accuracy and strength due to excessive spindle temperature. Utility Model Content

[0005] The purpose of this invention is to provide a new type of transmission shaft mechanism that is structurally reasonable, reliable in use, and has good sealing performance, good water cooling effect, and long service life, thus solving the above problems.

[0006] The technical solution of this utility model is: A novel transmission shaft mechanism includes a support base, an outer shaft fixed on the support base, and an inner shaft disposed within the outer shaft. The key technical features are: a magnetohydrodynamic seal is provided on the support base to mate with the outer shaft; one end of the inner shaft passes sequentially through the mandrel of the magnetohydrodynamic seal, a rotary sealing structure, and a conductive slip ring; the inner shaft and the mandrel are fixed as a single unit; the other end of the inner shaft extends out onto the outer shaft and is connected to a bearing between them; the inner shaft is hollow and has an inner water jacket on its inner wall; the rotary sealing structure communicates with the inner water jacket; an outer water jacket is provided on the inner wall of the outer shaft; a thermocouple passes through the inner shaft; the conductive slip ring is electrically connected to the thermocouple; the bottom of the support base is connected and fixed to the slider of a linear module; a driven pulley is fixed to the exposed end of the mandrel of the magnetohydrodynamic seal; a drive motor reducer is fixed to the outer wall of the magnetohydrodynamic seal; and a drive pulley connected to the driven pulley is provided on the output end of the drive motor reducer.

[0007] The aforementioned novel transmission shaft mechanism has an outer circulation inlet and an outer circulation outlet on the outer wall of the outer shaft, which are connected to the outer water jacket.

[0008] In the aforementioned novel transmission shaft mechanism, a first connecting component is provided between the outer wall of the magnetohydrodynamic seal and the outer wall of the rotary sealing structure, and the outer wall of the rotary sealing structure is provided with an inner circulation inlet and an inner circulation outlet that communicate with the inner water jacket.

[0009] In the aforementioned novel transmission shaft mechanism, a second connecting component is provided between the outer wall of the conductive slip ring and the first connecting component.

[0010] The beneficial effects of this invention are: 1. Both the inner and outer shafts are designed with water-cooling structures, namely inner and outer water jackets, to prevent deformation and damage when the inner and outer shafts are too hot.

[0011] 2. Water is supplied to the inner water jacket of the inner shaft through a rotating sealing structure, so that the external water pipes will not get tangled together while the inner shaft rotates.

[0012] 3. The thermocouple is powered by a conductive slip ring, so that the external cables of the thermocouple in the inner shaft will not get tangled together while the inner shaft rotates.

[0013] 4. The magnetic fluid seal is adopted to improve the sealing performance. The mandrel of the magnetic fluid seal is connected to the drive motor reducer through a belt drive mechanism to realize the rotation drive of the inner shaft.

[0014] 5. The linear module enables linear feed motion of the support base and its components, effectively improving the accuracy of linear displacement. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 yes Figure 1 Top view; Figure 3 This is a perspective view of the present invention.

[0016] In the diagram: 1. Inner shaft, 2. Outer shaft, 3. Support seat, 4. Magnetohydrodynamic seal, 5. Rotary seal structure, 6. Conductive slip ring, 7. Thermocouple, 8. Second connecting assembly, 9. First connecting assembly, 10. Linear module, 11. Outer water jacket, 12. Inner water jacket, 13. Bearing, 14. Driving pulley, 15. Driven pulley. Detailed Implementation

[0017] The present invention will be described in detail with reference to the accompanying drawings.

[0018] like Figures 1-3As shown, the novel transmission shaft mechanism includes a support base 3, an outer shaft 2 fixed on the support base 3, and an inner shaft 1 disposed in the outer shaft 2.

[0019] The support base 3 is provided with a magnetohydrodynamic seal 4 that mates with the outer shaft 2. One end of the inner shaft 1 passes through the mandrel of the magnetohydrodynamic seal 4, the rotary sealing structure 5, and the conductive slip ring 6 in sequence, and the inner shaft 1 is fixed to the mandrel as a whole. The other end of the inner shaft 1 leads out of the outer shaft 2 and is provided with a bearing 13 between the inner shaft 1 and the outer shaft 2.

[0020] The inner shaft 1 is a hollow shaft with an inner water jacket 12 on its inner wall. The rotary sealing structure 5 communicates with the inner water jacket 12. A first connecting component 9 is provided between the outer wall of the magnetohydrodynamic seal 4 and the outer wall of the rotary sealing structure 5. The outer wall of the rotary sealing structure 5 has an inner circulation inlet and an inner circulation outlet communicating with the inner water jacket 12. The rotary sealing structure does not interfere with the rotation of the inner shaft. The inner wall of the outer shaft 2 has an outer water jacket 11. The outer wall of the outer shaft 2 has an outer circulation inlet and an outer circulation outlet communicating with the outer water jacket 11. A second connecting component 8 is provided between the outer wall of the conductive slip ring 6 and the first connecting component 9. A thermocouple 7 passes through the inner shaft 1, and the conductive slip ring 6 is electrically connected to the thermocouple 7.

[0021] The bottom of the support base 3 is connected and fixed to the slider of the linear module 10. The exposed end of the mandrel of the magnetohydrodynamic seal 4 is fixed with a driven pulley 15, and a drive motor reducer 13 is fixed on the outer wall of the magnetohydrodynamic seal 4. The output end of the drive motor reducer 13 is provided with a drive pulley 14 connected to the driven pulley 15.

[0022] Working principle: 1. This mechanism can achieve both rotational and linear motion, and utilizes a rotary sealing structure 5 and a conductive slip ring 6 to prevent external water pipes or external wiring from getting tangled.

[0023] 2. During operation, start the linear module 10 to drive the support base 3 and its components to achieve linear feed.

[0024] 3. Start the drive motor reducer 13, which drives the magnetic fluid seal mandrel and inner shaft 1 to rotate through the belt drive mechanism, while the outer shaft 2 only moves linearly and does not rotate.

[0025] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made within the scope of this utility model should still fall within the scope of this utility model.

Claims

1. A novel transmission shaft mechanism, comprising a support base, an outer shaft fixed to the support base, and an inner shaft disposed within the outer shaft, characterized in that: The support base is equipped with a magnetohydrodynamic seal that mates with the outer shaft. One end of the inner shaft passes through the mandrel of the magnetohydrodynamic seal, the rotary sealing structure, and the conductive slip ring in sequence. The inner shaft and the mandrel are fixed together. The other end of the inner shaft leads out to the outer shaft and is provided with a bearing between them. The inner shaft is a hollow shaft and its inner wall is provided with an inner water jacket. The rotary sealing structure is connected to the inner water jacket. The inner wall of the outer shaft is provided with an outer water jacket. A thermocouple passes through the inner shaft. The conductive slip ring is electrically connected to the thermocouple. The bottom of the support base is connected and fixed to the slider of the linear module. A driven pulley is fixed to the exposed end of the mandrel of the magnetohydrodynamic seal. A drive motor reducer is fixed to the outer wall of the magnetohydrodynamic seal. A drive pulley connected to the driven pulley is provided on the output end of the drive motor reducer.

2. The novel transmission shaft mechanism according to claim 1, characterized in that: The outer wall of the outer shaft is provided with an outer circulation inlet and an outer circulation outlet that communicate with the outer water jacket.

3. The novel transmission shaft mechanism according to claim 1, characterized in that: A first connecting component is provided between the outer wall of the magnetohydrodynamic seal and the outer wall of the rotary sealing structure. The outer wall of the rotary sealing structure is provided with an inner circulation inlet and an inner circulation outlet that communicate with the inner water jacket.

4. The novel transmission shaft mechanism according to claim 1, characterized in that: A second connecting component is provided between the outer wall of the conductive slip ring and the first connecting component.

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