Speed measuring device of rotating equipment

Abstract

The utility model discloses a speed measuring device of rotating equipment. Comprising a cylindrical shell, a displacement compensation structure, a tachometer wheel and a supporting bearing, wherein one end of the cylindrical shell is open, and a shaft hole is formed in the center of the other end of the cylindrical shell; the displacement compensation structure is arranged in the shell, and one end of the displacement compensation structure is connected with a measured rotating shaft; the tachometer wheel is inserted into the shell from the shaft hole and is connected to the other end of the displacement compensation structure; and the speed measurement sensor is arranged on the outer side surface of the shell and corresponds to the speed measurement wheel. The speed measuring device of the rotating equipment can be easily installed on the supporting shell of the rotating shaft to be measured, and the speed measuring device can adapt to the multi-direction movement of the rotating shaft to be measured in the axial direction and the radial direction through the arrangement of the displacement compensation structure. A fixed gap can be always kept between the tachometer wheel and the tachometer sensor under the condition that the displacement of the measured rotating shaft is relatively large, and the accuracy of a rotating speed signal is ensured, so that the measurement precision is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of speed measurement, in particular to a speed measuring device for rotating equipment. Background Art

[0002] Precisely measuring the speed of rotating equipment is a common application in protective devices. These devices typically consist of a rotating armature and a speed sensor, with the armature being threaded or welded to the end face of the shaft. To ensure accurate measurement, the sensor and armature are kept close together, typically 1-3 mm. If the shaft to be measured is secured by bearings, its radial displacement is generally small, and this type of speed measurement device can meet the distance measurement requirements. However, shafts supported by bearings or sleeves typically experience significant radial displacement, often exceeding 3 mm. Therefore, conventional measurement devices cannot be used. During use, the armature often scrapes against the speed sensor due to significant radial movement. Summary of the Invention

[0003] In view of this, the utility model provides a speed measuring device for rotating equipment, which has axial and radial displacement compensation functions, and can ensure that the rotation speed of the measured rotating shaft can still be accurately measured when the position of the measured rotating shaft changes by a large amplitude.

[0004] The utility model solves the above problems through the following technical means:

[0005] The utility model provides a speed measuring device for rotating equipment, comprising a cylindrical housing with an open end and an axial hole formed in the center of the other end, a displacement compensation structure disposed within the housing and connected to a rotating shaft to be measured at one end, a speed measuring wheel inserted into the housing through the axial hole and connected to the other end of the displacement compensation structure, a support bearing disposed at the axial hole for assembling the speed measuring wheel, and a speed measuring sensor disposed on the outer surface of the housing and corresponding to the speed measuring wheel.

[0006] The displacement compensation structure includes a central connecting shaft, a first universal joint provided at one end of the connecting shaft and connected to the measured rotating shaft, and a second universal joint provided at the other end of the connecting shaft and connected to the rotating shaft of the speed measuring wheel.

[0007] Preferably, the open end of the shell is provided with a connecting flange for fixing the whole to the support housing of the measured rotating shaft.

[0008] Preferably, the connecting flange and the housing are detachable structures.

[0009] Preferably, the speed sensor is fixed to the housing via an L-shaped fixing bracket.

[0010] As a further improvement of the above technical solution, the length of the rotating shaft of the tachometer wheel extending out of the housing portion is 10 mm-20 mm, and its diameter is smaller than the inner diameter of the support bearing.

[0011] Preferably, the inner surface of the shell is provided with a sound-absorbing cotton layer.

[0012] It can be seen from the above technical solution that the utility model has the following beneficial effects:

[0013] The speed measuring device of the rotating equipment of the present invention can be easily installed on the support housing of the measured rotating shaft. Through the arrangement of the displacement compensation structure, the speed measuring device can adapt to the multi-directional movement of the measured rotating shaft in the axial and radial directions. When the amount of movement of the measured rotating shaft is large, a fixed gap can always be maintained between the speed measuring wheel and the speed measuring sensor, thereby ensuring the accuracy of the speed signal and thus ensuring the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the speed measuring device of the rotating equipment of the utility model when assembled;

[0015] Figure 2 This is a schematic diagram of the structure of the speed measuring device of the rotating equipment after assembly of the utility model.

[0016] like Figure 1 、 Figure 2 , housing-1, displacement compensation structure-2, connecting shaft-21, first universal joint-22, second universal joint-23, speed measuring wheel-3, support bearing-4, speed sensor-5, connecting flange-6, fixing frame-7, sound absorbing cotton layer-8. DETAILED DESCRIPTION

[0017] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0018] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, unless otherwise specified, "plurality" means two or more.

[0019] The present invention will be described in detail below with reference to the accompanying drawings. Figures 1 to 2 As shown: The speed measuring device of the rotating equipment described in this embodiment includes a cylindrical shell 1 with an open end and an axial hole in the center of the other end, a displacement compensation structure 2 arranged in the shell 1 and connected to the measured rotating shaft at one end, a speed measuring wheel 3 inserted into the shell 1 from the axial hole and connected to the other end of the displacement compensation structure 2, a support bearing 4 for assembling the speed measuring wheel 3 arranged at the axial hole, and a speed sensor 5 arranged on the outer surface of the shell 1 corresponding to the speed measuring wheel 3; the displacement compensation structure 2 includes a middle connecting shaft 21, a first universal joint 22 arranged at one end of the connecting shaft 21 and connected to the measured rotating shaft, and a second universal joint 23 arranged at the other end of the connecting shaft 21 and connected to the rotating shaft of the speed measuring wheel 3.

[0020] The speed measuring device of the rotating equipment described in this embodiment can be easily installed on the support housing of the measured rotating shaft. Through the arrangement of the displacement compensation structure 2, the speed measuring device can adapt to the multi-directional movement of the measured rotating shaft in the axial and radial directions. Even when the measured rotating shaft has a large amount of movement, a fixed gap can always be maintained between the speed measuring wheel 3 and the speed sensor 5, thereby ensuring the accuracy of the speed signal and thus ensuring the measurement accuracy.

[0021] To facilitate installation, as a preferred embodiment of the above technical solution, the open end of the housing 1 is provided with a connecting flange 6 for fixing the entire housing to the support housing of the measured shaft.

[0022] As a preferred embodiment of the above technical solution, the connecting flange 6 and the housing 1 are detachable and split structures, the size of which can be flexibly adjusted according to the volume of the object to be measured, and has wider applicability.

[0023] As a preferred implementation of the above technical solution, the speed sensor 5 is fixed to the housing 1 through an L-shaped fixing bracket 7, with one right-angled side thereof being fixed against the housing 1 and the other right-angled side being parallel to the axial direction of the speed wheel 3. This not only makes the assembly more firm and stable, but also facilitates the speed sensor 5 to be parallel to the wheel surface of the speed wheel 3, resulting in more accurate measurement.

[0024] To facilitate assembly, as a further improvement to the above technical solution, the length of the portion of the rotating shaft of the speed measuring wheel 3 extending out of the housing 1 is 10mm-20mm, and its diameter is smaller than the inner diameter of the support bearing 4. Before connecting the device to the rotating shaft to be measured, the speed measuring wheel 3 is first pushed into the housing 1 so that the portion of the rotating shaft of the speed measuring wheel 3 extending out of the housing 1 slides into the support bearing 4. At this time, the first universal joint 22 extends out of the opening of the housing 1, as shown in FIG. Figure 1 As shown, it is convenient for workers to put their hands in for assembly.

[0025] As a preferred implementation of the above technical solution, a sound-absorbing cotton layer 8 is provided on the inner surface of the shell 1, which can block the rotation vibration and the noise generated by turning. After disassembling the device, the displacement compensation structure 2 will fall downward. At this time, the sound-absorbing cotton layer 8 can also protect the displacement compensation structure 2 to avoid collision damage and extend its service life.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A speed measuring device for a rotating device, characterized in that: The device comprises a cylindrical housing with an open end and an axial hole at the center of the other end, a displacement compensation structure disposed in the housing and connected to a rotating shaft to be measured at one end, a speed measuring wheel inserted into the housing through the axial hole and connected to the other end of the displacement compensation structure, a support bearing disposed at the axial hole for assembling the speed measuring wheel, and a speed measuring sensor disposed on the outer surface of the housing and corresponding to the speed measuring wheel. The displacement compensation structure includes a central connecting shaft, a first universal joint provided at one end of the connecting shaft and connected to the measured rotating shaft, and a second universal joint provided at the other end of the connecting shaft and connected to the rotating shaft of the speed measuring wheel.

2. The speed measuring device for rotating equipment according to claim 1, characterized in that: The open end of the shell is provided with a connecting flange for fixing the whole to the support housing of the measured rotating shaft.

3. The speed measuring device for rotating equipment according to claim 2, characterized in that: The connecting flange and the housing are detachable structures.

4. The speed measuring device for rotating equipment according to claim 1, characterized in that: The speed sensor is fixed on the housing via an L-shaped fixing bracket.

5. The speed measuring device for rotating equipment according to claim 1, characterized in that: The length of the rotating shaft of the speed measuring wheel extending out of the housing portion is 10 mm to 20 mm, and its diameter is smaller than the inner diameter of the support bearing.

6. The speed measuring device for rotating equipment according to claim 1, characterized in that: The inner surface of the shell is covered with a sound-absorbing cotton layer.

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