High-precision expansion shaft tool for gear hobbing

Abstract

The utility model discloses a high-precision expansion shaft tool for gear hobbing, which comprises a liquid expansion shaft and a counter flange, and a main body part comprises a main body part and a liquid expansion positioning part; a high-pressure pipeline filled with high-pressure oil is arranged in the main body part, an annular liquid expansion cavity is formed in the liquid expansion positioning part, one end of the high-pressure pipeline is communicated with the liquid expansion cavity, and a hydraulic pipeline and a detection pipeline which are communicated with the high-pressure pipeline are arranged at the other end of the high-pressure pipeline; an air cylinder, an electromagnetic valve, a displacement sensor and a pressure sensor are arranged in the main body part, the air cylinder comprises a cylinder barrel, an end cover, a piston and a piston rod, the displacement sensor and the pressure sensor are electrically connected with the electromagnetic valve, and the piston rod penetrates into the hydraulic pipeline; the displacement sensor is arranged on an end cover of the cylinder; and a pressure sensitive element of the pressure sensor penetrates into the detection pipeline. The gear expansion fixing device has the advantages that expansion fixing of the gear can be self-adapted, and the gear cannot be deformed on the premise that the gear is fixed and fastened.

Description

Technical Field

[0001] This utility model relates to the field of gear transmission technology, and in particular to a high-precision shaft expansion tool for gear hobbing. Background Technology

[0002] In the gear hobbing process, one of the most critical factors affecting the machining accuracy of mechanical parts is the precise positioning of the gear. Currently, hydraulic tie rods to drive tapered sleeve expansion shafts are a widely used precision positioning method. However, with the application and development of automation, informatization, and AI intelligence in gear hobbing, the drawbacks of tapered sleeve expansion shafts have become apparent.

[0003] Currently, when using a tapered sleeve expansion shaft to clamp gears, the clamping force between the tapered sleeve expansion shaft and the gear is not adjustable. When the clamping force of the tapered sleeve expansion shaft on the gear is too large, it is very easy to cause the gear to deform or overload and damage the workpiece. When the clamping force of the tapered sleeve expansion shaft on the gear is too small, it is easy to have a loose clamp or incomplete clamping. This can easily lead to defective products or production accidents, and improvements are needed. Utility Model Content

[0004] The purpose of this invention is to propose a high-precision shaft expansion tool for gear hobbing that can adaptively fix the gear.

[0005] This utility model proposes a high-precision expanding shaft tooling for gear hobbing, including a hydraulic expanding shaft and a docking flange. The hydraulic expanding shaft includes a main body and a hydraulic expanding positioning part. The docking flange is fixedly installed to the end of the main body away from the hydraulic expanding positioning part. A high-pressure pipeline containing high-pressure oil is opened in the main body. An annular hydraulic expanding cavity is opened in the hydraulic expanding positioning part. One end of the high-pressure pipeline is connected to the hydraulic expanding cavity, and the other end of the high-pressure pipeline is provided with a hydraulic pipeline and a detection pipeline connected thereto. A cylinder, a solenoid valve, a displacement sensor, and a pressure sensor are arranged in the main body. The cylinder includes a cylinder barrel, an end cover, a piston, and a piston rod. The displacement sensor and the pressure sensor are both electrically connected to the solenoid valve. The piston rod passes through the hydraulic pipeline. The solenoid valve controls the movement of the piston rod of the cylinder within the hydraulic pipeline. The displacement sensor is set on the end cover of the cylinder to sense changes in piston displacement. The pressure-sensitive element of the pressure sensor passes through the detection pipeline to detect changes in hydraulic pressure within the high-pressure oil circuit.

[0006] Preferably, a high-pressure oil seal is provided inside the main body, and the high-pressure oil seal is sleeved around the piston rod.

[0007] Preferably, a first sealing groove is formed on both sides of the piston, and a second sealing groove is formed on both sides of the end cap, with an O-ring provided in both the first and second sealing grooves.

[0008] Preferably, the O-ring is made of rubber material.

[0009] Preferably, the size of the main body is larger than the size of the liquid expansion positioning part. A plurality of positioning bosses are provided at one end of the main body near the liquid expansion positioning part. The plurality of positioning bosses surround the periphery of the liquid expansion positioning part. After the gear is sleeved on the periphery of the liquid expansion positioning part, one side surface of the gear abuts against each positioning boss.

[0010] Preferably, the main body has an air inlet pipe, an air ring cavity and a plurality of air blowing holes formed therein. One side of the air ring cavity is connected to the air inlet pipe, and the other side of the air ring cavity is connected to each air blowing hole. The plurality of air blowing holes are located between each positioning boss and the hydraulic expansion positioning part.

[0011] Preferably, an air blowing connector is provided at the inlet of the air intake pipe.

[0012] Preferably, the mating flange and the main body are installed using a stop joint, and the surface of the mating flange is provided with a plurality of screw holes and a plurality of through holes, and the screw holes of the mating flange are fixed to the main body by bolts.

[0013] Preferably, a pipeline cavity is formed inside the main body, the solenoid valve is disposed inside the pipeline cavity, the connecting flange has a pipeline hole extending axially through it, an oil slinger cap is provided at the opening of the pipeline cavity, a wire hole is provided in the oil slinger cap, and an oil slinger shoulder is provided around the wire hole.

[0014] As can be seen from the above description of this utility model, this utility model has the following beneficial effects:

[0015] 1. After the cylinder is pressurized, high-pressure oil enters the hydraulic expansion chamber of the hydraulic expansion positioning part, so that the hydraulic expansion positioning part can be tightened with the gear. The displacement sensor monitors the displacement changes of the piston and piston rod, and the pressure sensor monitors the hydraulic pressure changes of the high-pressure oil in the detection pipeline. From this, the expansion size and abnormal conditions of the hydraulic expansion positioning part can be inferred, which is convenient for adaptive control.

[0016] 2. Gas is introduced into the intake pipe. After entering the air ring cavity, the gas is discharged from each air blowing hole. The gas discharged from the air blowing hole blows away the dust layer on the surface of the hydraulic expansion positioning part, thereby ensuring that the surface of the hydraulic expansion positioning part is clean and reliable and stable when tightening the gear. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a high-precision shaft expansion tool for gear hobbing according to an embodiment;

[0018] Figure 2 This is a front view of a high-precision shaft expansion tooling for gear hobbing according to an embodiment;

[0019] Figure 3 This is a cross-sectional view of a high-precision shaft expansion tooling for gear hobbing according to an embodiment;

[0020] Figure 4 This is a cross-sectional view of the hydraulic expansion shaft in the embodiment;

[0021] Figure 5 This is a front view of the mating flange in the embodiment;

[0022] Figure 6 This is a front view of the air inlet and the positioning boss in the embodiment;

[0023] Figure 7 This is an example. Figure 3 Sectional view at point A in the middle;

[0024] Figure 8 This is a cross-sectional view of the end cap, piston, and piston rod of the embodiment;

[0025] Figure 9 This is a schematic diagram of the oil-slinging cap in the embodiment;

[0026] Figure 10 This is a cross-sectional view of the oil-slinging cap in the embodiment.

[0027] Reference numerals: 1. Hydraulic shaft; 11. Breathing port; 12. Waterproof and breathable valve; 2. Connecting flange; 21. Pipeline hole; 22. Screw hole; 23. Through hole; 3. Main body; 31. Pipeline cavity; 32. Positioning boss; 33. Air inlet pipe; 331. Air blowing connector; 34. Air ring cavity; 35. Air blowing hole; 36. High-pressure oil seal; 37. High-pressure oil circuit; 38. Hydraulic pipeline; 39. Detection pipeline; 4. Hydraulic positioning part; 41. Hydraulic expansion cavity; 5. Cylinder; 51. Cylinder barrel; 52. End cap; 521. Second sealing groove; 53. Piston; 531. First sealing groove; 54. Piston rod; 55. O-ring; 6. Solenoid valve; 7. Displacement sensor; 8. Pressure sensor; 81. Pressure sensitive element; 9. Oil slinger cap; 91. Wiring hole; 92. Oil slinger shoulder. Detailed Implementation

[0028] To make the technical problem to be solved, the technical solution and the beneficial effects of this utility model clearer and more understandable, the following description is provided in conjunction with the appendix. Figure 1-10 The present invention will be further described in detail below with reference to the 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.

[0029] Reference Figures 1-5A high-precision expansion shaft fixture for gear hobbing includes a hydraulic expansion shaft 1 and a mating flange 2. The hydraulic expansion shaft 1 includes a main body 3 and a hydraulic positioning part 4 for mounting gears. The hydraulic positioning part 4 is located at one end of the main body 3, and the mating flange 2 is installed with the end of the main body 3 away from the hydraulic positioning part 4. A pipeline cavity 31 is formed at the end of the main body 3 where it is installed with the mating flange 2, and a pipeline hole 21 is formed through the axial direction of the mating flange 2. The mating flange 2 and the end of the main body 3 with the pipeline cavity 31 are connected by a stop joint. For this purpose, a plurality of screw holes 22 and a plurality of through holes 23 are formed on the surface of the mating flange 2, and the screw holes 22 and through holes 23 are spaced apart. The screw holes 22 of the mating flange 2 are bolted to the main body 3. After installation, the concentricity between the mating flange 2 and the hydraulic positioning part 4 is controlled within 2 μm. The high-precision expansion shaft tooling is fixed to the spindle of the external equipment at the through hole 23 of the docking flange 2 by bolt fastening.

[0030] Reference Figure 6 The main body 3 is larger than the hydraulic positioning part 4. Several positioning bosses 32 are provided at one end of the main body 3 near the hydraulic positioning part 4. Each positioning boss 32 is evenly surrounding the periphery of the hydraulic positioning part 4 and maintains a distance from it. The gear is fitted onto the hydraulic positioning part 4, with one side of the gear abutting against each positioning boss 32. The runout of the end face of the positioning boss 32 is controlled within 2µm, ensuring high precision in the installation of the hydraulic shaft 1 and gear positioning, guaranteeing machining accuracy.

[0031] Reference Figure 3 and Figure 4 To ensure the gear is securely positioned and installed on the hydraulically expanded positioning part 4, an air inlet pipe 33, an air ring cavity 34, and several air blowing holes 35 are formed within the main body 3. Each air blowing hole 35 is located between the hydraulically expanded positioning part 4 and each positioning boss 32. One side of the air ring cavity 34 is connected to the air inlet pipe 33, and the other side of the air ring cavity 34 is connected to each air blowing hole 35. To facilitate the input of gas into the air inlet pipe 33, an air blowing connector 331 is provided at the inlet of the air inlet pipe 33, through which gas is input into the air inlet pipe 33. After the gas enters the air ring cavity 34, it is discharged from each air blowing hole 35. The gas discharged from the air blowing holes 35 blows away the dust layer on the surface of the hydraulically expanded positioning part 4, thereby ensuring that the surface of the hydraulically expanded positioning part 4 is clean and reliable and stable when the gear is tightened.

[0032] To enable the hydraulic expansion positioning part 4 to tighten and fix the gear surrounding it, an annular hydraulic expansion cavity 41 is formed within the hydraulic expansion positioning part 4. A high-pressure oil circuit 37, a hydraulic pipeline 38, and a detection pipeline 39 are provided within the main body part 3. One end of the high-pressure oil circuit 37 is connected to the hydraulic expansion cavity 41, and the other end of the high-pressure oil circuit 37 is connected to both the hydraulic pipeline 38 and the detection pipeline 39. High-pressure oil is contained within the high-pressure oil circuit 37. A cylinder 5 (not shown in the figure), a solenoid valve 6, a displacement sensor 7, and a pressure sensor 8 are provided within the main body part 3, with the solenoid valve 6 located within the pipeline cavity 31. The cylinder 5 is controlled by the solenoid valve 6, and both the displacement sensor 7 and the pressure sensor 8 are electrically connected to the solenoid valve 6.

[0033] Reference Figure 4 and Figure 7 The cylinder 5 includes a cylinder barrel 51, an end cap 52, a piston 53, and a piston rod 54. The piston rod 54 of the cylinder 5 is inserted into the hydraulic line 38. The piston 53 is controlled by the solenoid valve 6 to move within the cylinder barrel 51, thereby driving the piston rod 54 to move within the hydraulic line 38. After the solenoid valve 6 supplies gas into the cylinder 5, it pushes the piston 53 to move within the cylinder barrel 51, causing the piston rod 54 to push high-pressure oil to the hydraulic expansion chamber 41 of the hydraulic expansion positioning part 4, thereby causing the hydraulic expansion positioning part 4 to expand, thus securing the gear on the hydraulic expansion positioning part 4.

[0034] A displacement sensor 7 is mounted on the end cap 52 of cylinder 5. The displacement sensor 7 senses the movement of piston 53 within cylinder 51, thereby detecting the degree of pressure applied by piston 53 to the high-pressure oil in hydraulic line 38. A pressure sensor 8 is horizontally fixed, with its pressure-sensitive element 81 extending into detection line 39. This allows for precise control of the pressurized pressure within detection line 39 via pressure sensor 8. By monitoring the displacement changes of piston 53 and piston rod 54 using displacement sensor 7, and monitoring the hydraulic pressure changes of high-pressure oil in detection line 39 using pressure sensor 8, the expansion and abnormal conditions of the hydraulic expansion positioning part 4 can be inferred, facilitating adaptive control.

[0035] Reference Figure 7 and Figure 8To prevent high-pressure oil from overflowing from the hydraulic pipe, a high-pressure oil seal 36 is installed inside the main body 3, and the high-pressure oil seal 36 is fitted around the piston rod 54. A breather port 11 is provided through the main body to the inside of the cylinder 51, and a waterproof vent valve 12 can be installed inside the breather port 11. The breather port 11 allows the gas inside the cylinder 5 to exchange with the external gas, thereby balancing the internal pressure and preventing damage to the cylinder 5 due to excessive pressure. In addition, the breather port 11 can also help the cylinder 5 to expel residual gas during the reset process, ensuring that the cylinder 5 can smoothly return to the initial position. To improve the airtightness of the cylinder 5, first sealing grooves 531 are formed on both sides of the piston 53, and second sealing grooves 521 are formed on both sides of the end cover 52. O-rings 55 are fitted into both the first and second sealing grooves 531 and 521, respectively, to seal the gaps between the piston 53 and the cylinder 51, and between the end cover 52 and the cylinder 51, thereby improving the airtightness of the cylinder 5. The O-rings 55 are made of rubber for even better sealing performance.

[0036] Reference Figure 9 and Figure 10 In addition, to prevent oil and water from entering the pipeline cavity 31, an oil slinger cap 9 is provided at the opening of the pipeline cavity 31, and a wire-passing hole 91 is formed in the center of the oil slinger cap 9. An oil slinger shoulder 92 is formed on the outer periphery of the wire-passing hole 91 on the oil slinger cap 9. In addition, an air pipe, signal line and control line are also provided in the pipeline cavity 31. The signal line and control line provided in the pipeline cavity 31 can pass through the wire-passing hole 91 of the oil slinger cap 9 and the pipeline hole 21 of the connecting flange 2. The oil slinger shoulder 92 further prevents oil and water from entering the pipeline cavity 31.

[0037] The specific implementation principle of this application embodiment is as follows: When the gear needs to be clamped and fixed by the high-precision expansion shaft tooling, the docking flange 2 of the high-precision expansion shaft tooling is installed with the main shaft of the external equipment, and bolts are used to fix it to the main shaft of the external equipment at the through hole 23 of the docking flange 2. Gas is blown into the air inlet pipe 33 from the air blowing joint 331. After the gas enters the air ring cavity 34, it is discharged from each air blowing hole 35, thereby blowing away the air on the surface of the liquid expansion positioning part 4, thereby ensuring that the surface of the liquid expansion positioning part 4 is clean and ensuring reliable and stable tightening of the gear. The gear is sleeved on the liquid expansion positioning part 4 of the liquid expansion shaft 1, so that one side of the gear abuts against each positioning boss 32 on the main body 3.

[0038] Subsequently, gas is injected into cylinder 5 via solenoid valve 6. After entering cylinder 51, the gas is pressurized by piston 53, causing piston rod 54 to push high-pressure oil into hydraulic expansion chamber 41, thereby causing hydraulic expansion positioning part 4 to tighten with the gear. Displacement sensor 7 monitors the displacement changes of piston 53 and piston rod 54, and pressure sensor 8 monitors the hydraulic pressure changes of high-pressure oil in detection line 39. From this, the degree of tightening of hydraulic expansion positioning part 4 and any abnormalities can be inferred. The monitoring information is then fed back to solenoid valve 6 for adaptive control. This prevents the gear from being loosely clamped or not properly clamped.

[0039] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution to other situations without modification, shall be protected by the present invention.

Claims

1. A high-precision shaft expansion fixture for gear hobbing, characterized in that: The device includes a hydraulic shaft and a docking flange. The hydraulic shaft includes a main body and a hydraulic positioning part. The docking flange is fixedly installed to the end of the main body away from the hydraulic positioning part. The main body has a high-pressure pipeline containing high-pressure oil, and the hydraulic expansion positioning part has an annular hydraulic expansion cavity. One end of the high-pressure pipeline is connected to the hydraulic expansion cavity, and the other end of the high-pressure pipeline is provided with a hydraulic pipeline and a detection pipeline connected thereto. The main body is equipped with a cylinder, a solenoid valve, a displacement sensor, and a pressure sensor. The cylinder includes a cylinder barrel, an end cap, a piston, and a piston rod. The displacement sensor and the pressure sensor are both electrically connected to the solenoid valve. The piston rod passes through a hydraulic pipeline, and the solenoid valve controls the movement of the piston rod of the cylinder within the hydraulic pipeline. The displacement sensor is mounted on the end cover of the cylinder to sense changes in piston displacement. The pressure-sensitive element of the pressure sensor is inserted into the detection pipeline to detect hydraulic changes in the high-pressure oil circuit.

2. The high-precision shaft expansion fixture for gear hobbing according to claim 1, characterized in that: A high-pressure oil seal is provided inside the main body, and the high-pressure oil seal is sleeved around the piston rod.

3. The high-precision shaft expansion fixture for gear hobbing according to claim 1, characterized in that: The piston has a first sealing groove formed on both sides of its surface, and the end cap has a second sealing groove formed on both sides of its surface. O-rings are provided in both the first and second sealing grooves.

4. A high-precision shaft expansion fixture for gear hobbing according to claim 3, characterized in that: The O-ring is made of rubber.

5. A high-precision shaft expansion fixture for gear hobbing according to claim 1, characterized in that: The size of the main body is larger than the size of the liquid expansion positioning part. A number of positioning bosses are provided at one end of the main body near the liquid expansion positioning part. The number of positioning bosses surround the periphery of the liquid expansion positioning part. After the gear is sleeved on the periphery of the liquid expansion positioning part, one side surface of the gear abuts against each positioning boss.

6. A high-precision shaft expansion fixture for gear hobbing according to claim 5, characterized in that: The main body has an air inlet pipe, an air ring cavity and several air blowing holes. One side of the air ring cavity is connected to the air inlet pipe, and the other side of the air ring cavity is connected to each air blowing hole. The air blowing holes are located between each positioning boss and the hydraulic expansion positioning part.

7. A high-precision shaft expansion fixture for gear hobbing according to claim 6, characterized in that: An air-blowing connector is provided at the inlet of the air intake pipe.

8. A high-precision shaft expansion fixture for gear hobbing according to claim 1, characterized in that: The mating flange and the main body are installed using a stop joint. The surface of the mating flange has several screw holes and several through holes. The screw holes of the mating flange are fixed to the main body using bolts.

9. A high-precision shaft expansion fixture for gear hobbing according to claim 1, characterized in that: A pipeline cavity is formed inside the main body, the solenoid valve is installed inside the pipeline cavity, the connecting flange has a pipeline hole that runs through it axially, an oil slinger cap is provided at the opening of the pipeline cavity, a wire hole is provided in the oil slinger cap, and an oil slinger shoulder is provided around the wire hole.

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