Speed measuring device

Abstract

The utility model discloses a speed measuring device, which relates to the technical field of belt speed measurement and comprises a swing arm with an inverted U-shaped cross section. The bearing wheel is rotationally connected to one end of the swing arm, one side of a wheel body of the bearing wheel extends in the axial direction of the bearing wheel to form a connecting ring, and the connecting ring protrudes out of the side face of the wheel body and is fixedly connected with a measuring wheel; the proximity switch is fixedly connected to the inner side of the swing arm, and the fixed position of the proximity switch corresponds to the position of the measuring wheel; and the connecting piece is rotationally connected to the other end of the swing arm. The speed measuring device is good in speed measuring effect, simple and reliable in structure and long in service life.

Description

Technical Field

[0001] The utility model relates to the technical field of belt speed measurement, and specifically relates to a speed measurement device. Background Technique

[0002] An electronic belt scale is a weighing instrument for automatically and continuously weighing bulk materials. Since the belt scale operates dynamically and is affected by various factors, relatively loose requirements are imposed on the metering accuracy, but high requirements are placed on the operating reliability.

[0003] However, most of the currently widely used speed measurement sensors are connected to the speed measurement drum through a coupling. In this connection method, the center of gravity is unevenly distributed, and rotor wear easily causes loosening problems at the connection part, seriously affecting the service life of the speed measurement device.

[0004] In the Chinese utility model patent application number: CN202321568740.6, a speed measurement device applied to a high-speed belt is disclosed. It offsets the problem of center of gravity offset caused by the installation of the speed detector on one side by adding a counterweight, but the overall mass increase of the rotating part will lead to an increase in the rotational resistance of the speed measurement wheel, resulting in a slipping phenomenon and affecting the speed measurement effect.

[0005] Therefore, it is necessary to propose a speed measurement device to solve the above problems. Content of the Utility Model

[0006] (I) Technical Problems to be Solved

[0007] The purpose of the utility model is to provide a speed measurement device with good speed measurement effect, simple and reliable structure, and long service life to solve the problems raised in the above background technique.

[0008] (II) Technical Solutions

[0009] To achieve the above purposes, the utility model is realized through the following technical solutions: A speed measurement device, comprising:

[0010] A swing arm;

[0011] A bearing wheel, the bearing wheel is rotatably connected to one end of the swing arm, a connecting ring is formed along the axial direction on one side of the wheel body of the bearing wheel, and the connecting ring protrudes from the side surface of the wheel body and is fixedly connected with a measurement wheel;

[0012] A proximity switch, the proximity switch is fixedly connected to the inner side of the swing arm, and the fixed position of the proximity switch corresponds to the position of the measurement wheel;

[0013] A connecting piece, the connecting piece is rotatably connected to the other end of the swing arm.

[0014] Preferably, the cross-section of the swing arm is in an inverted U shape.

[0015] Preferably, the measuring wheel is fixedly connected to the connecting ring by bolts.

[0016] Preferably, a stepped groove is formed at one end of the connecting ring away from the wheel body. The measuring wheel is sleeved on the outside of the stepped groove, and a first circlip is provided on the side of the measuring wheel away from the wheel body.

[0017] Preferably, the measuring wheel is a toothed metal wheel.

[0018] Preferably, an annular groove adapted to the diameter of the connecting ring is formed on one side of the measuring wheel.

[0019] Preferably, a mounting bracket is fixedly connected to the inner side of the swing arm. An external thread is provided on the outside of the proximity switch. The proximity switch passes through the mounting bracket and is fixedly connected to the mounting bracket by a nut.

[0020] Preferably, the proximity switch is located on the extension line of the diameter of the bearing wheel.

[0021] Preferably, the connecting member is U-shaped. The two ends of the connecting member are respectively located on both sides of the swing arm. The swing arm is rotatably connected to the connecting member by a pin shaft.

[0022] Preferably, a gasket is provided between the connecting member and the swing arm. The gasket is sleeved on the outside of the pin shaft.

[0023] (III) Beneficial Effects

[0024] Compared with the prior art, the present utility model provides a speed measuring device, which has the following beneficial effects:

[0025] In this speed measuring device, a measuring wheel is fixed on one side of the wheel body of the bearing wheel, and a proximity switch is fixed at a corresponding position inside the swing arm. The speed is measured by the cooperation of the two, reducing the rotational resistance of the bearing wheel, avoiding relative sliding of the bearing wheel with respect to the belt, and improving the detection accuracy; at the same time, its structure is simple and reliable, and it has a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic cross-sectional view of the structure of the present utility model;

[0027] Figure 2 is a three-dimensional schematic view of the bearing wheel of the present utility model;

[0028] Figure 3 is a schematic cross-sectional view of the bearing wheel of the present utility model;

[0029] Figure 4 is a schematic cross-sectional view of the measuring wheel of the present utility model;

[0030] Figure 5 is a schematic view of the usage state of the structure of the present utility model.

[0031] In the figure: 1, bearing wheel; 2, measuring wheel; 3, mounting bracket; 4, proximity switch; 5, swing arm; 6, nut; 7, pin shaft; 8, connecting piece; 9, bolt; 10, connecting ring; 11, annular groove; 12, wheel body; 13, bracket; 14, stepped groove; 15, first circlip; 16, stepped shaft. Specific embodiments

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0033] Please refer to Figures 1-3 As shown, a speed measuring device includes a bearing wheel 1, a proximity switch 4, a swing arm 5 and a connecting piece 8; the bearing wheel 1 is rotatably connected to one end of the swing arm 5, and a connecting ring 10 is formed on one side of the wheel body 12 of the bearing wheel 1 along its axial direction. The connecting ring 10 protrudes from the side surface of the wheel body 12 and is fixedly connected with a measuring wheel 2; the proximity switch 4 is fixedly connected to the inner side of the swing arm 5, and the fixed position of the proximity switch 4 corresponds to the position of the measuring wheel 2; the connecting piece 8 is rotatably connected to the other end of the swing arm 5. Specifically, the measuring wheel 2 is a toothed metal wheel.

[0034] During use, the connecting piece 8 is fixed to the bracket 13 of the belt conveyor, the swing arm 5 rotates under the action of its own weight, the bearing wheel 1 contacts the inner surface of the belt. During the conveying process, under the action of friction, when the belt drives the bearing wheel 1 to rotate, when the tooth peak of the measuring wheel 2 passes by the proximity switch 4, it outputs a high-level signal, and when the tooth valley of the measuring wheel 2 passes by the proximity switch 4, it outputs a low-level signal. The number n of high-level signals (or low-level signals) within a preset time period t is counted; the belt speed calculation formula is: ; where d is the outer diameter of the bearing wheel 1 and m is the number of teeth of the measuring wheel 2.

[0035] The proximity switch 4 is used in cooperation with the measuring wheel 2 for speed measurement, which has high reliability and long service life; by fixing the measuring wheel 2 on one side of the wheel body 12 and making its diameter smaller than that of the wheel body 12, its appearance is simple and the installation is convenient; preferably, the cross-section of the swing arm 5 is in an inverted U shape, and the inverted U-shaped swing arm 5 can protect the proximity switch 4.

[0036] In some embodiments, please refer to Figure 4 As shown, the measuring wheel 2 is fixedly connected to the connecting ring 10 by bolts 9. By using bolts 9 for fixation, it is convenient for the maintenance and replacement of the measuring wheel 2.

[0037] In some embodiments, please refer to Figure 3As shown, a stepped groove 14 is formed at one end of the connecting ring 10 away from the wheel body 12. The measuring wheel 2 is sleeved outside the stepped groove 14, and a first snap ring 15 is provided on one side of the measuring wheel 2 away from the wheel body 12. The measuring wheel 2 is limited by the first snap ring 15 and the stepped groove 14 of the connecting ring 10 to prevent it from swinging, and its connection structure is more convenient. Preferably, a flat key is provided between the measuring wheel 2 and the connecting ring 10. By providing the flat key, relative rotation between the measuring wheel 2 and the connecting ring 10 is avoided.

[0038] An annular groove 11 adapted to the diameter of the connecting ring 10 is formed on one side of the measuring wheel 2. By providing the annular groove 11, the measuring wheel 2 and the bearing wheel 1 can be coaxially aligned.

[0039] In some embodiments, a mounting bracket 3 is fixedly connected to the inner side of the swing arm 5. External threads are provided on the outer side of the proximity switch 4. The proximity switch 4 passes through the mounting bracket 3 and is fixedly connected to the mounting bracket 3 by two nuts 6. Specifically, the nuts 6 are threadedly connected to the proximity switch 4, and the two nuts 6 are respectively located on both sides of the thin plate-shaped mounting bracket 3 and clamped and fixed. The proximity switch 4 is fixed by the two nuts 6 to adjust the distance between the detection head of the proximity switch 4 and the measuring wheel 2 to achieve a detection distance adapted to the proximity switch 4.

[0040] In order to improve the detection accuracy, the proximity switch 4 is located on the extension line of the diameter of the bearing wheel 1 to ensure that the measuring wheel 2 can stably trigger the proximity switch 4 during the rotation of the bearing wheel 1, thereby realizing accurate and reliable speed measurement.

[0041] In some embodiments, the connecting member 8 is U-shaped, and both ends of the connecting member 8 are respectively located on both sides of the swing arm 5. The swing arm 5 is rotatably connected to the connecting member 8 through a pin shaft 7. Preferably, a gasket is provided between the connecting member 8 and the swing arm 5. The gasket is sleeved outside the pin shaft 7. By providing the gasket to fill the gap between the swing arm 5 and the connecting member 8, the swing of the swing arm 5 in the horizontal direction is avoided, and at the same time, mutual friction between the swing arm 5 and the connecting member 8 is avoided.

[0042] In some embodiments, the bearing wheel 1 is connected to the swing arm 5 through a stepped shaft 16. The bearing wheel 1 is limited on the stepped shaft 16 by a second snap ring, and the bearing wheel 1 is key-connected to the stepped shaft 16 to prevent relative rotation between the inner ring of the bearing wheel 1 and the stepped shaft 16.

[0043] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A speed measurement device, characterized in that: Comprising: Swing arm (5); Bearing wheel (1), the bearing wheel (1) is rotatably connected to one end of the swing arm (5), a connecting ring (10) is formed by extending along the axial direction on one side of the wheel body (12) of the bearing wheel (1), the connecting ring (10) protrudes from the side surface of the wheel body (12) and is fixedly connected with a measuring wheel (2); Proximity switch (4), the proximity switch (4) is fixedly connected to the inner side of the swing arm (5), and the fixed position of the proximity switch (4) corresponds to the position of the measuring wheel (2); Connecting piece (8), the connecting piece (8) is rotatably connected to the other end of the swing arm (5).

2. The speed measurement device according to claim 1, characterized in that: The cross-section of the swing arm (5) is inverted U-shaped.

3. A speed measurement device according to claim 1, characterized in that: The measuring wheel (2) is fixedly connected to the connecting ring (10) by bolts (9).

4. A speed measuring device according to claim 1, characterized in that: A stepped groove (14) is formed at one end of the connecting ring (10) away from the wheel body (12), the measuring wheel (2) is sleeved on the outside of the stepped groove (14), and a first circlip (15) is arranged on the side of the measuring wheel (2) away from the wheel body (12).

5. A speed measurement device according to claim 1, characterized in that: The measuring wheel (2) is a toothed metal wheel.

6. The speed measuring device according to claim 1, characterized in that: An annular groove (11) adapted to the diameter of the connecting ring (10) is formed on one side of the measuring wheel (2).

7. The speed measurement device according to claim 1, characterized in that: An installation frame (3) is fixedly connected to the inner side of the swing arm (5), an external thread is formed on the outside of the proximity switch (4), and the proximity switch (4) penetrates through the installation frame (3) and is fixedly connected to the installation frame (3) by a nut (6).

8. A speed measuring device according to claim 1, characterized in that: The proximity switch (4) is located on the extension line of the diameter of the bearing wheel (1).

9. A speed measuring device according to claim 1, characterized in that: The connecting piece (8) is U-shaped, both ends of the connecting piece (8) are respectively located on both sides of the swing arm (5), and the swing arm (5) is rotatably connected to the connecting piece (8) by a pin shaft (7).

10. A speed measuring device according to claim 7, characterized in that: A gasket is arranged between the connecting piece (8) and the swing arm (5), and the gasket is sleeved on the outside of the pin shaft (7).

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