Spline structure transmission shaft

Abstract

The invention discloses a transmission shaft with a spline structure. The transmission shaft comprises a transmission shaft body, a spline sleeve, a bearing cover and a connecting bottom plate. A flat key notch structure is arranged at one end of a thin shaft of the transmission shaft, a spline structure is arranged at one end of a thick shaft of the transmission shaft, a spline structure is arranged on the inner surface of the spline sleeve, a completely-through threaded hole is formed in the outer surface of the spline sleeve, and the spline ends of the two transmission shafts are fixedly connected through the spline sleeve through the spline structure. A stepped hole is formed in the connecting cover, a bearing assembly is installed in the stepped hole, a completely-through counterbore is formed in the edge of the connecting cover, a semicircular opening is formed in the middle of the connecting base, four small round holes are formed in the periphery of the semicircular opening, and completely-through through holes are formed near the four corners of the connecting base. Efficient torque transmission can be achieved, energy loss is reduced, the transmission efficiency is improved, the large contact area is achieved, large torque and loads can be borne, and the high-speed transmission is suitable for the heavy-load working condition.

Description

Technical Field

[0001] The invention relates to the technical field of development and industrial application of a drive shaft of an isolated power supply system in boron neutron capture therapy technology, and in particular to a drive shaft with a spline structure. Background Art

[0002] The drive shaft is one of the key components of the drive shaft of the isolated power supply system in the boron neutron capture therapy technology. The drive shaft in the isolated power supply system is usually made of high-strength materials to withstand large torque and load. The two ends of the drive shaft are usually connected to other mechanical parts through universal joints, splines, flanges and other connection methods to form a complete transmission system. The types of drive shafts are usually divided into the following three categories according to the structure, namely: rigid drive shaft, universal joint drive shaft, spline drive shaft, telescopic drive shaft. The rigid drive shaft is made of a single material, has high rigidity and strength, and is suitable for short-distance and high-precision transmission systems. The universal joint drive shaft is connected by a universal joint and can transmit torque within a certain angle range. It is suitable for transmission systems that require angle adjustment. The spline drive shaft is connected by a spline, has high transmission efficiency and good concentricity, and is suitable for high-load and high-speed transmission systems. The telescopic drive shaft has a retractable structure and can adjust the length within a certain range. It is suitable for transmission systems that require axial adjustment.

[0003] In the BNCT technology equipment, the isolated power supply system is one of its core key components. The performance of the isolated power supply system directly determines the neutron yield and life of the neutron generator. The isolated power supply system works in a 2.5MeV high voltage environment. The drive shaft is used to connect the motor and the generator set, and transmit the mechanical energy of the motor to the generator to ensure that stable power can be provided for the BNCT. Although the existing drive shaft technology has made significant progress, there are still some shortcomings. For example, the general drive shaft is made of metal or carbon fiber, which has no insulation effect and will spark in a high-voltage environment. Ordinary insulating materials are not rigid and strong enough, and are prone to breakage during use. The manufacturing cost is high and maintenance is difficult. Therefore, there is an urgent need for an improved insulating drive shaft technology to reduce manufacturing costs and simplify maintenance. Summary of the invention

[0004] In order to solve the above problems, the purpose of the present invention is to provide a spline structure transmission shaft, which can realize convenient installation and disassembly of the transmission shaft, and at the same time meet the requirements of continuous safe and stable operation of the isolated power supply system.

[0005] The present invention is realized through the following technical scheme: a spline structure transmission shaft, the spline structure transmission shaft comprises a transmission shaft, a spline sleeve, a bearing cover, and a connecting base plate; wherein, both ends of the spline sleeve are connected to the transmission shaft, one end of the transmission shaft is a thick shaft, and the other end is a thin shaft, and one end of the thick shaft is provided with a spline; one end of the thin shaft is provided with a flat key groove; the inner walls at both ends of the spline sleeve are provided with spline grooves; the transmission shaft and the spline sleeve are rigidly connected by the spline at one end of the thick shaft and the spline groove on the inner surface of the spline sleeve; the transmission shaft passes through the bearing cover, a ceramic bearing is arranged in the bearing cover, and the surface of the thin shaft is interference fit with the ceramic bearing; a connecting base plate is fixedly installed at one end of the bearing cover.

[0006] The beneficial effects of the present invention are:

[0007] Under the premise of ensuring the stable operation of the isolated power supply system, it can effectively solve the mechanical instability problem of the drive shaft during operation, ensuring the continuous safe and stable operation of the boron neutron capture therapy technology system; at the same time, the drive shaft can be easily disassembled and replaced during the later maintenance work of the accelerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0009] Figure 2 It is a schematic diagram of the spline structure opened on the transmission shaft;

[0010] Figure 3 Schematic diagram of the connecting base plate structure;

[0011] Figure 4 (a) is a front view of the bearing cover structure;

[0012] Figure 4 (b) is a side view of the bearing cover structure.

[0013] In the figure, 1-transmission shaft; 2-spline sleeve; 3-bearing cover; 4-connecting base plate; 5-spline; 6-flat key slot; 7-slot-type through hole; 8-center hole; 9-bevel slot. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in each embodiment of the present invention described below can be combined with each other as long as they do not conflict with each other. To achieve the above-mentioned purpose, the present invention adopts the following technical scheme.

[0015] like Figure 1As shown, a spline structure transmission shaft of the present invention includes a transmission shaft 1, a spline sleeve 2, a bearing cover 3, and a connecting base plate 4. The transmission shaft 1 is fixedly connected to the spline sleeve 2 by a spline connection; the spline sleeve 2 fixes the transmission shaft 1 as a whole by a threaded connection, and the threaded connection method is specifically as follows: four threaded holes penetrating the sleeve wall are opened on the outer surface of the spline sleeve 2, and the bolts are passed through the threaded holes and tightened to hit the splines of the transmission shaft; the bearing cover 3 is fixed to the step of the transmission shaft 1 by an interference fit with the thin shaft of the transmission shaft 1, and a groove is opened in the middle for placing the ceramic bearing, so that the ceramic bearing and the thin shaft of the transmission shaft 1 are too tight, and six 6 M6 countersunk holes are opened on the edge of the bearing cover 3; a center hole 8 is opened at the center of the main body of the connecting base plate 4, which is used for interference fit with the thin shaft of the transmission shaft 1, and a beveled notch 9 is opened from the position of the center hole 8 to the edge of the main body, and 4 M6 through holes are opened on the edge of the center hole 8, and the connecting base plate 4 and the bearing cover 3 are connected as a whole by bolting the M6 ​​through holes and the M6 ​​countersunk holes.

[0016] like Figure 2 As shown, the transmission shaft 1 is fixed as a whole with the spline sleeve 2 by a spline connection. The insulating material POM is used to prepare the transmission shaft. The rated parameters of the motor during operation mainly faced by the present invention are 1500rpm, and the rated torque of the motor is 34.7 Nm. Therefore, the thin shaft size of the transmission shaft 1 is set to a circle of Φ50 mm and a length of 638.75 mm, and the thick shaft size of the transmission shaft 1 is set to a circle of Φ62 mm and a length of 283.75 mm. Eight splines 5 with a length of 70 mm and a width of 10 mm are provided on the end face of the thick shaft, and a flat key slot 6 with a length of 14 mm and a depth of 50 mm is provided 5.5 mm away from the edge of the end face of the thin shaft, which can effectively transmit torque and axial force, facilitate installation and disassembly, and reduce maintenance time and replacement costs.

[0017] The spline sleeve 2 is a cylinder made of POM material; the outer diameter of the spline sleeve 2 is 115mm and the inner diameter is 50mm; four symmetrical and completely penetrating M6 threaded holes are opened on the surface; the inner surface is opened with a spline groove matching the coarse shaft spline; it is used to fix the spline ends of the two transmission shafts 1.

[0018] As shown in Figure 4 (a) and Figure 4 (b), the bearing cover 3 is a cylinder made of transparent acrylic material; the outer diameter of the bearing cover 3 is 120 mm and the thickness is 30 mm; 6 M6 countersunk holes are completely penetrated on the upper surface; the relative distance between the countersunk holes is 105 mm; the countersunk holes are used for fixed connection with the connecting base plate 4; one end face of the bearing cover 3 is provided with a groove with a diameter of 90 mm and a depth of 20 mm for placing ceramic bearings; the other end face of the bearing cover 3 is provided with a 75 mm through hole, which is concentric with the above-mentioned groove and interconnected, and is used to accommodate the transmission shaft; all edges and corners are set to be chamfered with 1 mm.

[0019] like Figure 3 As shown, the connecting base plate 4 is a rectangular plate made of transparent acrylic material; the overall dimensions are 230mm x180mm; the four corners are slightly chamfered, and the chamfer size is 3mm to prevent damage from sharp corners; four slot-shaped through holes 7 are opened at the edge of the main body, and the slot-shaped through holes 7 are used to be fixedly connected to the fixed base on the isolation power supply system. The slot-shaped through holes 7 are 16.5mm long and 13.5mm wide. The slot-shaped through holes 7 are 190mm apart horizontally and 103.5mm apart vertically, and are installed and fixed with bolts or screws; a center hole 8 with a diameter of 80mm is opened in the middle of the main body to accommodate the transmission shaft; a beveled notch 9 is opened from the center hole to the edge of the main body, and the angle of the beveled notch 9 is 90° to avoid other structures and reduce material usage; four M6 through holes are evenly distributed around the center hole 8.

[0020] The present invention first connects the splines 5 of the two transmission shafts 1 with the spline slots 6 in the spline sleeve 2. The spline structure enables the transmission shaft to effectively transmit torque and axial force during operation, facilitates installation and disassembly, and reduces maintenance time and replacement costs. The bearing is placed in the bearing cover 3, and the bearing cover 3 and the connecting base plate 4 are fixed by bolts. Then, the fixed bearing group is inserted into the transmission shaft 1 through the center hole 8 for tight fit. The four bearing groups are matched to reduce the vibration effect generated by the transmission shaft during rated operation. A flat key slot 6 is provided at the thin shaft of the transmission shaft 1, and the transmission shaft 1 is connected to the driving device through a coupling to provide kinetic energy for the transmission shaft 1, so that the transmission shaft 1 can run stably under the working conditions of a rated torque of 34.7 Nm and a rated speed of 1500 rpm.

[0021] The present invention does not elaborate on some of the common technologies of those skilled in the art. The above-described embodiments are only descriptions of preferred implementations of the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementations described. Without departing from the design spirit of the present invention, various modifications and improvements made by ordinary technicians in this field to the technical solution of the present invention should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A transmission shaft with a spline structure, characterized in that: The spline structure transmission shaft includes a transmission shaft, a spline sleeve, a bearing cover, and a connecting base plate; wherein, both ends of the spline sleeve are connected to the transmission shaft, one end of the transmission shaft is a thick shaft, and the other end is a thin shaft, and one end of the thick shaft is provided with a spline; one end of the thin shaft is provided with a flat key slot; the inner walls at both ends of the spline sleeve are provided with spline slots; the transmission shaft and the spline sleeve are rigidly connected through the spline at one end of the thick shaft and the spline slot on the inner surface of the spline sleeve; the transmission shaft passes through the bearing cover, and a ceramic bearing is arranged in the bearing cover, and the surface of the thin shaft is interference fit with the ceramic bearing; a connecting base plate is fixedly installed at one end of the bearing cover.

2. A spline structure transmission shaft according to claim 1, characterized in that: The transmission shaft is a cylinder made of POM material; the thin shaft size of the transmission shaft is: Φ50 mm×638.75 mm; a flat key slot with a length of 14 mm and a depth of 50 mm is opened 5.5 mm away from the edge of the end face; the thick shaft size of the transmission shaft is Φ62 mm×283.75 mm; 8 splines with a length of 70 mm and a width of 10 mm are arranged on the end face of the thick shaft.

3. A spline structure transmission shaft according to claim 2, characterized in that: The spline sleeve is a cylinder made of POM material; the outer diameter of the spline sleeve is 115mm and the inner diameter is 50mm; the circumferential surface of the spline sleeve is provided with four symmetrical M6 threaded holes that completely penetrate the sleeve wall, and the bolts are tightened through the M6 ​​threaded holes and then pressed against the splines of the transmission shaft.

4. A spline structure transmission shaft according to claim 3, characterized in that: The bearing cover is a cylinder made of transparent acrylic material. The outer diameter of the bearing cover is 120 mm and the thickness is 30 mm. The bearing cover is provided with 6 M6 countersunk holes that completely penetrate the thickness of the bearing, and the relative countersunk hole distance is 105 mm; the countersunk holes are used for fixed connection with the M6 ​​through holes connecting the base plate. One end face of the bearing cover is provided with a notch with a diameter of 90 mm and a depth of 20 mm for placing ceramic bearings. The other end face of the bearing cover is provided with a 75 mm through hole, which is concentric with the above-mentioned notch and interpenetrates with each other, and the transmission shaft passes through the through hole.

5. A spline structure transmission shaft according to claim 4, characterized in that: The connecting base plate is a rectangular plate made of transparent acrylic material with an overall size of 230mm×180mm; four slot-shaped through holes are opened at the edge of the main body, and the slot-shaped through holes are used to be fixedly connected to the fixed base on the isolation power supply system. A center hole with a diameter of 80mm is opened in the middle of the main body to accommodate the transmission shaft; a beveled notch is opened from the center hole to the edge of the main body, and the angle of the beveled notch is 90°. Four M6 through holes are evenly distributed around the center hole for connecting to the four M6 countersunk holes on the bearing cover.

6. A spline structure transmission shaft according to claim 1, characterized in that: The two transmission shafts are inserted into the spline sleeves so that the end faces of the two transmission shafts coincide with each other.

Images