Exhaust device of precise speed reducer

Abstract

The utility model relates to an exhaust device of a precision speed reducer, which is characterized in that the lower part of a ventilation column is fixedly connected with a speed reducer box body, and the lower part of an axial through hole in the ventilation column is connected with a plurality of oil baffle plates; a ventilation gap is formed between the lower end of the cover top and the upper end of the ventilation column; a plurality of exhaust through holes are uniformly distributed in the upper circumference of the transverse edge part of the lower ring edge of the dustproof cover; an arc-shaped top surface is arranged in the middle of the lower end of the cover top; the filter screen sleeves the upper end of the ventilation column and is fixedly arranged at the lower end of the dustproof cover; the ventilation valve is installed in an axial through hole of the ventilation column, an oil return hole is formed in the ventilation valve, and the pressing plug is installed in an installation through hole in the dustproof cover and connected with an external controller. The pressure spring is arranged between the pressing plug and the vent valve, so that the middle conical section of the vent valve is in sealing contact with the conical hole section of the vent column; the pressure sensor is fixedly installed at the lower end of the vent valve, and detection signal output is achieved in a wireless mode. The device achieves better exhaust and oil return effects.

Description

Technical Field

[0001] The utility model belongs to the technical field of reducers, and in particular relates to an exhaust device for a precision reducer. Background Art

[0002] Precision reducers have the characteristics of large transmission ratio, high precision, and large load capacity, and are mainly used in high-precision and high-stability industrial application scenarios. When the reducer runs for a long time under conditions of high input speed or heavy load, its internal temperature will continue to rise, and the gas pressure inside the box will increase. In the absence of a ventilation device, it is easy to affect the sealing performance of the oil seal and seriously reduce the service life of the reducer itself.

[0003] The existing reducer ventilation device is difficult to avoid leakage caused by oil atomization under high temperature environment inside the reducer. At the same time, it lacks the ability to monitor the internal air pressure of the reducer and effectively balance the air pressure inside and outside the reducer in real time. Therefore, it is necessary to further improve the performance of the reducer ventilation device to solve the above problems. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model proposes an exhaust device for a precision reducer which can monitor the internal air pressure of the reducer in real time, effectively reduce the internal temperature and air pressure of the reducer, and effectively prevent the oil leakage inside the reducer.

[0005] The above-mentioned purpose of the utility model is achieved through the following technical solutions:

[0006] An exhaust device for a precision reducer, comprising a vent column, a dust cover, a compression plug, a compression spring, a vent valve, a filter screen, and a pressure sensor;

[0007] The upper and lower parts of the ventilation column are both provided with external threads; the ventilation column is fixedly connected to the reducer housing through the lower external threads; an axial through hole is provided inside the ventilation column, and the axial through hole is composed of a coaxially arranged lower hole section, a transition hole section, a tapered hole section with a smaller bottom and a larger top, and an upper hole section; a plurality of inwardly extending oil baffles are connected to the hole wall of the lower hole section;

[0008] The dust cover is composed of a cover top and a lower ring edge connected to the edge of the cover top; a mounting through hole is provided in the middle of the cover top, and an arc-shaped top surface is provided in the middle of the lower end of the cover top; the lower ring edge of the dust cover adopts a ring edge with an L-shaped cross section, and an internal thread is provided on the inner side of the horizontal edge of the lower ring edge, which is connected to the upper external thread of the ventilation column, so that the cover top is fixedly installed above the ventilation column, and a ventilation gap is formed between the lower end of the cover top of the dust cover and the upper end of the ventilation column; a plurality of exhaust through holes are evenly distributed along the circumferential direction on the horizontal edge of the lower ring edge;

[0009] The filter screen is an annular filter screen, which is sleeved on the outside of the upper end of the ventilation column and fixedly installed on the lower end of the dust cover;

[0010] The vent valve is composed of an upper cylindrical section, a middle conical section and a lower cylindrical section, and the taper of the middle conical section is consistent with the taper of the conical hole in the vent column; a compression spring positioning hole is arranged at the center of the upper end of the vent valve, and a plurality of oil return holes are evenly arranged in the vent valve along the circumferential direction, the inner ends of the plurality of oil return holes extend to the compression spring positioning groove, the outer ends of the plurality of oil return holes extend to the outer conical surface of the middle conical section, and the plurality of oil return holes are arranged downwardly inclined from the inside to the outside;

[0011] The vent valve is installed in the axial through hole of the vent column, and the compression plug is installed in the installation through hole on the dust cover in a slidable manner up and down, and is connected to an external controller; the compression spring is arranged between the compression plug and the vent valve, the upper end of the compression spring is positioned and matched with the lower end of the compression plug to form a top pressure contact, the lower end of the compression spring is inserted into the compression spring positioning hole, and forms a top pressure contact with the vent valve, so that the middle conical section of the vent valve and the conical hole section of the vent column form a sealing contact, and the upper cylindrical section of the vent valve and the upper hole section of the vent column and the lower cylindrical section of the vent valve and the transition hole section of the vent column form a clearance fit;

[0012] The pressure sensor is fixedly mounted on the lower end of the ventilation valve, and the pressure sensor outputs a detection signal wirelessly.

[0013] Moreover, the plurality of oil baffles are all arranged to be inclined downward, and are staggered on both sides along the up-down direction.

[0014] Moreover, the radial dimension of the lower edge of the arc-shaped top surface is consistent with the aperture of the upper hole section on the ventilation column.

[0015] Furthermore, the exhaust through hole is a fan-shaped hole.

[0016] The advantages and positive effects of the utility model are:

[0017] 1. The utility model can monitor the internal air pressure of the reducer in real time and effectively balance the internal and external air pressure of the reducer by arranging a vent valve, a compression plug and a pressure sensor.

[0018] 2. The utility model forms a labyrinth gas passage through the axial through hole on the ventilation column, the staggered oil baffles arranged in the axial through hole, the ventilation gap between the upper end of the ventilation column and the dust cover, and the exhaust through hole on the dust cover. At the same time, an inclined oil return hole is arranged on the ventilation valve, and an arc-shaped top surface is arranged on the inner top of the dust cover. On the one hand, the smooth discharge of gas is realized, and the purpose of effectively reducing the internal temperature and air pressure of the reducer is achieved. On the other hand, the reflux of oil mist ascending with the gas is realized, and the leakage of oil in the reducer is effectively avoided.

[0019] 3. The utility model effectively prevents external dust from entering the reducer and contaminating the lubricating oil by arranging a filter screen, a dust cover and a vent valve, thereby ensuring the performance of the lubricating oil inside the reducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an overall longitudinal sectional view of the utility model;

[0021] Figure 2 This is a schematic diagram of oil return of the utility model;

[0022] Figure 3 This is a schematic diagram of the outward exhaust of the utility model;

[0023] In the figure: 1-ventilation column, 11-oil baffle, 12-conical surface, 2-dust cover, 21-arc top, 22-exhaust through hole, 3-compression plug, 4-compression spring, 5-vent valve, 51-oil return groove, 6-filter screen, 7-pressure sensor. DETAILED DESCRIPTION

[0024] The structure of the utility model is further described below with reference to the accompanying drawings and through embodiments. It should be noted that the embodiments are descriptive rather than restrictive.

[0025] A venting device for precision reducers, see Figure 1-Figure 3 The invention point is: it includes a ventilation column 1, a dust cover 2, a compression plug 3, a compression spring 4, a ventilation valve 5, a filter screen 6, and a pressure sensor 7.

[0026] The upper and lower parts of the ventilation column are both provided with external threads. The ventilation column is fixedly connected to the reducer housing through the lower external threads. An axial through hole is provided inside the ventilation column, and the axial through hole is composed of a coaxially arranged lower hole section, a transition hole section, a tapered hole section 12 with a smaller bottom and a larger top, and an upper hole section. The aperture of the transition hole section is smaller than that of the lower hole section, the aperture of the lower end of the tapered hole end is consistent with the aperture of the transition hole section, and the aperture of the large end of the tapered hole end is consistent with the aperture of the upper hole section. A plurality of inwardly extending oil baffles 11 are connected to the hole wall of the lower hole section, and the plurality of oil baffles are all arranged in a downward tilt, and are staggered on both sides along the up and down directions to allow the oil in the oil mist to reflux.

[0027] The dust cover is composed of a cover top and a lower ring edge connected to the edge of the cover top. A mounting through hole is provided in the middle of the cover top for mounting a compression plug, and an arc-shaped top surface 21 is provided in the middle of the lower end of the cover top for realizing the reflux of oil. The radial dimension of the lower edge of the arc-shaped top surface is consistent with the aperture of the upper hole section on the ventilation column. The lower ring edge of the dust cover adopts a ring edge with an L-shaped cross section, and an internal thread is provided on the inner side of the horizontal edge of the lower ring edge for connecting with the external thread of the upper part of the ventilation column to realize the fixed installation of the cover top above the ventilation column. And there is an indirection between the lower end of the cover top of the dust cover and the upper end of the ventilation column to form a ventilation gap. In order to realize the discharge of gas, a plurality of exhaust through holes 22 are evenly distributed along the circumferential direction on the horizontal edge of the lower ring edge. The exhaust through holes are preferably fan-shaped holes, but not limited to them.

[0028] The filter screen is an annular filter screen, which is sleeved on the outside of the upper end of the ventilation column and fixedly installed on the lower end of the dust cover, which effectively prevents external dust from entering the reducer and contaminating the lubricating oil.

[0029] The vent valve adopts a rotating body structure, which is composed of an upper cylindrical section, a middle conical section and a lower cylindrical section. The taper of the middle conical section is consistent with the taper of the conical hole in the vent column. The outer diameter of the upper cylindrical section is slightly smaller than the aperture of the upper hole section of the vent column, and the outer diameter of the lower cylindrical section is slightly smaller than the aperture of the lower hole section of the vent column. A compression spring positioning hole is provided at the center of the upper end of the vent valve, and a plurality of oil return holes 51 are evenly distributed along the circumferential direction in the vent valve. The inner ends of the plurality of oil return holes extend to the compression spring positioning groove, and the outer ends of the oil return holes extend to the outer cone surface of the middle conical section. The plurality of oil return holes are arranged downwardly inclined from the inside to the outside, so that the oil can smoothly reflux under the action of weight.

[0030] The vent valve is installed in the axial through hole of the vent column, and the compression plug is installed in the mounting through hole on the dust cover in a slidable manner, and is connected to an external controller. The external controller enables the compression plug to move up and down in the axial through hole of the dust cover, thereby changing the preload force of the compression spring and adjusting the internal air pressure of the reducer. The external controller can adopt devices such as electric cylinders and electric push rods. The compression spring is arranged between the compression plug and the vent valve, and the upper end of the compression spring is positioned and matched with the lower end of the compression plug to form a top pressure contact. The lower end of the compression spring is inserted into the compression spring positioning hole and forms a top pressure contact with the vent valve. Through the action of the compression spring, the middle conical section of the vent valve is fitted with the conical hole section of the vent column to achieve sealing.

[0031] The pressure sensor is fixedly mounted at the lower end of the vent valve and is used to detect the gas pressure in the reducer at all times. The pressure sensor outputs the detection signal wirelessly.

[0032] How this works:

[0033] When the reducer is running continuously, the internal air pressure gradually increases, and the oil mist enters the ventilation device. The air pressure is monitored in real time by the pressure sensor fixedly installed on the lower end face of the vent valve, and the preload of the compression spring is adjusted by controlling the upper and lower positions of the compression plug. When the internal air pressure of the reducer is greater than the pressure of the compression spring on the vent valve, the vent valve moves outward along the vent column, so that a gap is generated between the conical hole section of the vent column and the middle conical section of the vent valve, so that the device is connected to the outside world, and the upward gas enters the ventilation gap between the dust cover and the vent column through the gap, and then is discharged through the exhaust hole on the dust cover. When the oil mist that goes up with the gas flows through the oil baffle inside the vent column, part of the oil refluxes, and the other part of the oil mist goes up through the gap between the conical hole section and the middle conical section of the vent valve, and under the action of the arc-shaped top surface of the dust cover, oil reflux is also generated, and finally flows back to the reducer through the oil return groove on the vent valve.

[0034] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. An exhaust device for a precision reducer, characterized in that: Including ventilation column, dust cover, compression plug, compression spring, ventilation valve, filter screen, pressure sensor; The upper and lower parts of the ventilation column are both provided with external threads; the ventilation column is fixedly connected to the reducer housing through the lower external threads; an axial through hole is provided inside the ventilation column, and the axial through hole is composed of a coaxially arranged lower hole section, a transition hole section, a tapered hole section with a smaller bottom and a larger top, and an upper hole section; a plurality of inwardly extending oil baffles are connected to the hole wall of the lower hole section; The dust cover is composed of a cover top and a lower ring edge connected to the edge of the cover top; a mounting through hole is provided in the middle of the cover top, and an arc-shaped top surface is provided in the middle of the lower end of the cover top; the lower ring edge of the dust cover adopts a ring edge with an L-shaped cross section, and an internal thread is provided on the inner side of the horizontal edge of the lower ring edge, which is connected to the upper external thread of the ventilation column, so that the cover top is fixedly installed above the ventilation column, and a ventilation gap is formed between the lower end of the cover top of the dust cover and the upper end of the ventilation column; a plurality of exhaust through holes are evenly distributed along the circumferential direction on the horizontal edge of the lower ring edge; The filter screen is an annular filter screen, which is sleeved on the outside of the upper end of the ventilation column and fixedly installed on the lower end of the dust cover; The vent valve is composed of an upper cylindrical section, a middle conical section and a lower cylindrical section, and the taper of the middle conical section is consistent with the taper of the conical hole in the vent column; a compression spring positioning hole is arranged at the center of the upper end of the vent valve, and a plurality of oil return holes are evenly arranged in the vent valve along the circumferential direction, the inner ends of the plurality of oil return holes extend to the compression spring positioning groove, the outer ends of the plurality of oil return holes extend to the outer conical surface of the middle conical section, and the plurality of oil return holes are arranged downwardly inclined from the inside to the outside; The vent valve is installed in the axial through hole of the vent column, and the compression plug is installed in the installation through hole on the dust cover in a slidable manner up and down, and is connected to an external controller; the compression spring is arranged between the compression plug and the vent valve, the upper end of the compression spring is positioned and matched with the lower end of the compression plug to form a top pressure contact, the lower end of the compression spring is inserted into the compression spring positioning hole, and forms a top pressure contact with the vent valve, so that the middle conical section of the vent valve and the conical hole section of the vent column form a sealing contact, and the upper cylindrical section of the vent valve and the upper hole section of the vent column and the lower cylindrical section of the vent valve and the transition hole section of the vent column form a clearance fit; The pressure sensor is fixedly mounted on the lower end of the ventilation valve, and the pressure sensor outputs a detection signal wirelessly.

2. The exhaust device of the precision reducer according to claim 1 is characterized in that: The multiple oil baffles are all arranged in a downward tilted manner and are staggered on both sides along the up and down directions.

3. The exhaust device of the precision reducer according to claim 1 is characterized in that: The radial dimension of the lower edge of the arc-shaped top surface is consistent with the aperture of the upper hole section on the ventilation column.

4. The exhaust device of the precision reducer according to claim 1 is characterized in that: The exhaust through hole is a fan-shaped hole.

Images