Protective cover for rotating speed sensor

Abstract

The invention discloses a protective cover for a rotating speed sensor, relates to the technical field of rotating speed sensors, and mainly aims to avoid monitoring inaccuracy of the rotating speed sensor due to jamming of pulverized coal. According to the main technical scheme, the protective cover for the rotating speed sensor comprises an elastic cover body, a first sealing ring and a second sealing ring; the elastic cover body is provided with a large head end and a small head end, the small head end wraps a bearing end of the rotating speed sensor, and the large head end wraps a shell of the rotating speed sensor; the first sealing ring is arranged on the inner side of the large head end; the second sealing ring is arranged on the inner side of the small head end; wherein the side face of the large-head end shaft is provided with an axial inclination angle, and the side face of the large-head end shaft is provided with threads used for screwing a nut.

Description

Technical Field

[0001] The invention relates to the technical field of rotation speed sensors, and in particular to a protective cover for a rotation speed sensor. Background Art

[0002] In a coal-fired boiler unit, the coal feeder is an important pre-equipment in the boiler auxiliary equipment. This equipment is generally arranged between the raw coal hopper and the coal mill. It can evenly deliver the raw coal in the raw coal hopper into the coal mill according to the coal load requirements.

[0003] A conveyor metering belt is installed inside the coal feeder. Under the conveyor metering belt, there is a high-precision electronic belt scale weighing device. There are two sensors in the device, one is the weighing sensor and the other is the speed sensor.

[0004] The speed sensors of the coal feeders are all installed inside the coal feeders. The bearings of these sensors are protected by only one mechanical oil seal, which causes the bearings of the speed sensors to become stuck after entering the coal powder, resulting in inaccurate fuel delivery monitoring and affecting the automatic load control and commissioning of the unit. Summary of the invention

[0005] In view of this, the present invention provides a protective cover for a rotation speed sensor, the main purpose of which is to prevent the rotation speed sensor from being misaligned due to coal powder jamming.

[0006] In order to achieve the above object, the present invention mainly provides the following technical solutions:

[0007] The present invention provides a protective cover for a rotation speed sensor, which comprises: an elastic cover body, a first sealing ring and a second sealing ring;

[0008] The elastic cover body is provided with a large head end and a small head end, the small head end is wrapped around the bearing end of the speed sensor, and the large head end is wrapped around the housing of the speed sensor;

[0009] The first sealing ring is arranged inside the large end;

[0010] The second sealing ring is arranged inside the small head end;

[0011] Wherein, the side surface of the big head end shaft is provided with an axial inclination angle, and the side surface of the big head end shaft is provided with a thread for screwing a nut.

[0012] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0013] Optionally, a groove is provided on the inner side of the large head end, and the first sealing ring is arranged in the groove.

[0014] Optionally, the inner side wall of the groove is fixedly connected to the outer edge of the first clamping ring, and the first sealing ring is correspondingly clamped to the inner edge of the first clamping ring.

[0015] Optionally, an annular inclined surface is further provided on the inner side of the large head end, and the annular inclined surface is located on the outer side of the groove.

[0016] Optionally, a flange is further included, the inner edge of the flange is fixedly connected to the axial side of the elastic cover body, and a plurality of through holes are evenly distributed around the circumference of the flange.

[0017] Optionally, the axial inclination angle is an elevation angle of the opening toward the flange.

[0018] Optionally, the axial inclination angle is less than 5°.

[0019] Optionally, the elastic cover body is made of nylon.

[0020] By means of the above technical solution, the present invention has at least the following advantages:

[0021] When using the protective cover, the bearing end of the speed sensor is placed into the elastic cover body from the large head end, so that the bearing end of the sensor fits against the inner surface of the small head end, and then the nut is screwed into the thread on the side of the shaft of the elastic cover body, so that the nut moves in the direction where the diameter of the outer edge of the elastic cover body becomes larger, thereby causing the nut to form radial extrusion on the large head end of the elastic cover body. In this way, the first sealing ring gradually fits tightly against the housing of the speed sensor, forms a seal on the side of the shaft of the housing of the speed sensor, and also prevents the cover body from being separated from the housing of the speed sensor. The second sealing ring is arranged on the inner side of the small head end, so that the second sealing ring covers the bearing end face of the transfer sensor.

[0022] Through the above arrangement, the contact between the bearing end of the speed sensor and the coal powder is isolated, so that the external coal powder is prevented from blocking the speed sensor bearing, thereby preventing the speed sensor from monitoring inaccuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic structural diagram of a protective cover for a rotation speed sensor provided in an embodiment of the present invention;

[0024] Figure 2 for Figure 1 Enlarged view of part A.

[0025] The reference numerals in the drawings of the specification include: elastic cover body 1, bearing end 2, housing 3, first sealing ring 4, second sealing ring 5, nut 6, first retaining ring 7, annular inclined surface 8, flange 9, through hole 10. DETAILED DESCRIPTION

[0026] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention application are described in detail below in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures, or characteristics in one or more embodiments may be combined in any suitable form.

[0027] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0028] like Figure 1 As shown, an embodiment of the present invention provides a protective cover for a rotation speed sensor, which includes: an elastic cover body 1, a first sealing ring 4 and a second sealing ring 5;

[0029] The elastic cover body 1 is provided with a large head end and a small head end, the small head end is wrapped around the bearing end 2 of the speed sensor, and the large head end is wrapped around the housing 3 of the speed sensor;

[0030] The first sealing ring 4 is arranged inside the large end;

[0031] The second sealing ring 5 is arranged inside the small head end;

[0032] Among them, the side surface of the big head end shaft is provided with an axial inclination angle, and the side surface of the big head end shaft is provided with a thread for screwing the nut 6.

[0033] The working process of a protective cover for a speed sensor is as follows:

[0034] When using the protective cover, the bearing end 2 of the speed sensor is placed into the elastic cover body 1 from the large head end, so that the bearing end 2 of the sensor fits the inner surface of the small head end, and then the nut 6 is screwed into the thread on the axial side of the elastic cover body 1, so that the nut 6 moves in the direction where the outer edge diameter of the elastic cover body 1 becomes larger, so that the nut 6 forms radial extrusion on the large head end of the elastic cover body 1, so that the first sealing ring 4 gradually fits tightly against the housing 3 of the speed sensor, forms a seal on the axial side of the housing 3 of the speed sensor, and also prevents the housing from being separated from the housing 3 of the speed sensor. The second sealing ring 5 is arranged on the inner side of the small head end, so that the second sealing ring 5 covers the bearing end 2 surfaces of the transfer sensor;

[0035] Through the above arrangement, the contact between the bearing end 2 of the speed sensor and the coal powder is isolated, so that the external coal powder is prevented from blocking the speed sensor bearing, thereby preventing the speed sensor from monitoring inaccuracy.

[0036] In a specific implementation, a groove is provided on the inner side of the large head end, and the first sealing ring 4 is arranged in the groove.

[0037] In the present embodiment, specifically, the first sealing ring 4 is arranged in the groove, which improves the position stability of the first sealing ring 4 on the inner side of the big head end. In the process that the big head end of the elastic cover body 1 is squeezed by the nut 6, the first sealing ring 4 is not easy to shift to the outside of the groove, thereby ensuring the sealing performance of the first sealing ring 4 on the peripheral side of the speed sensor housing 3.

[0038] In a specific implementation, the inner side wall of the groove is fixedly connected to the outer edge of the first clamping ring 7 , and the first sealing ring 4 is correspondingly clamped to the inner edge of the first clamping ring 7 .

[0039] In this embodiment, specifically, the first retaining ring 7 divides the groove into an inner groove and an outer groove. When the large head end of the elastic cover body 1 is radially squeezed and contracted by the tightened nut 6, a part of the first sealing ring 4 is located in the inner groove, and the other part of the first sealing ring 4 is located in the outer groove, which further enhances the relative position stability of the first sealing ring 4 and the groove.

[0040] like Figure 2 As shown, in a specific embodiment, an annular inclined surface 8 is further provided on the inner side of the large head end, and the annular inclined surface 8 is located on the outer side of the groove.

[0041] In this embodiment, specifically, during the process in which the big end of the elastic cover body 1 is radially squeezed and contracted by the tightened nut 6, there is a spacing between the annular inclined surface 8 and the peripheral side surface of the speed sensor housing 3, providing room for the inner side of the big end to be tightened and abutted against the speed sensor housing 3.

[0042] In a specific implementation, a flange 9 is further included, the inner edge of the flange 9 is fixedly connected to the axial side of the elastic cover body 1, and a plurality of through holes 10 are evenly distributed around the circumference of the flange 9.

[0043] In this embodiment, specifically, the plurality of through holes 10 can be used to pass bolts, so as to facilitate the use of bolts to fix the elastic cover 1 and the rotation speed sensor in the coal feeder.

[0044] In a specific implementation, the axial inclination angle is the elevation angle of the opening toward the flange 9 .

[0045] In this embodiment, when the protective cover is used, the axial inclination angle is the elevation angle of the opening toward the flange 9, the diameter of the big head end of the elastic cover body 1 is smaller than the inner edge diameter of the flange 9, and when the nut 6 is tightened, the nut 6 moves from the big head end toward the flange 9, and the radial pressure of the nut 6 on the elastic cover body 1 gradually increases, so that the big head end of the elastic cover body 1 is squeezed and the inner diameter is reduced, thereby achieving the purpose of improving the sealing effect.

[0046] In a specific embodiment, the axial inclination angle is less than 5°.

[0047] In this embodiment, specifically, the axial inclination angle is less than 5°. During the axial movement of the nut 6 along the elastic cover body 1, the rate of increase of the radial extrusion force of the nut 6 on the elastic cover body 1 will not be too large, thereby preventing the elastic cover body 1 from being damaged by the extrusion force of the nut 6.

[0048] In a specific implementation, the elastic cover body 1 is made of nylon.

[0049] In this embodiment, specifically, the elastic cover body 1 made of nylon material has good wear resistance, elasticity, and self-lubricating properties, which can prevent the nut 6 from squeezing the elastic cover body 1 multiple times and damaging the elastic cover body 1. At the same time, the elastic cover body 1 made of nylon material also has corresponding mechanical strength.

[0050] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A protective cover for a speed sensor, characterized in that: include: An elastic cover body, wherein the elastic cover body is provided with a large head end and a small head end, the small head end is wrapped around the bearing end of the speed sensor, and the large head end is wrapped around the housing of the speed sensor; A first sealing ring, wherein the first sealing ring is arranged inside the large end; A second sealing ring, the second sealing ring being arranged inside the small end; Wherein, the side surface of the big head end shaft is provided with an axial inclination angle, and the side surface of the big head end shaft is provided with a thread for screwing a nut.

2. The protective cover for the rotation speed sensor according to claim 1, characterized in that: A groove is provided on the inner side of the large head end, and the first sealing ring is arranged in the groove.

3. The protective cover for the rotation speed sensor according to claim 2, characterized in that: The inner side wall of the groove is fixedly connected to the outer edge of the first clamping ring, and the first sealing ring is correspondingly clamped to the inner edge of the first clamping ring.

4. The protective cover for the rotation speed sensor according to claim 2, characterized in that: An annular inclined surface is also provided on the inner side of the large head end, and the annular inclined surface is located on the outer side of the groove.

5. The protective cover for the rotation speed sensor according to claim 1, characterized in that: It also includes a flange, the inner edge of which is fixedly connected to the axial side of the elastic cover body, and the circumference of the flange is evenly distributed with a plurality of through holes.

6. The protective cover for the rotation speed sensor according to claim 5, characterized in that: The axial inclination angle is the elevation angle of the opening toward the flange.

7. The protective cover for the rotation speed sensor according to claim 6, characterized in that: The axial inclination angle is less than 5°.

8. The protective cover for a rotation speed sensor according to any one of claims 1 to 7, characterized in that: The elastic cover body is made of nylon.

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