Gravity sensing device for motor

Abstract

The utility model relates to the technical field of weighing and metering, and particularly discloses a gravity sensing device for a motor, which comprises a motor (10), a bearing (20) mounted on a shaft of the motor (10), and a gravity sensing device (30) mounted on the bearing (20), a lifting rope of an existing bridge crane is arranged on a motor, the motor rotates to achieve ascending and descending of the lifting rope, a gravity sensing device is installed on a bearing of the motor, rotation of the motor is not affected, and when a heavy object is lifted, the gravity of the heavy object can be transmitted to the motor through the lifting rope and then transmitted to the bearing through the motor. And finally, the gravity data is transmitted to the gravity sensing device through the bearing, the gravity data obtained by the gravity sensing device is displayed on an external display through infrared connection, and at the moment, an operator can judge whether the heavy object is overloaded or not according to the specific weight, so that the unnecessary danger caused by blind hoisting in the prior art is avoided, and meanwhile, the service life of the electric hoist is also prolonged.

Description

Technical Field

[0001] This utility model relates to the field of weighing and measurement technology, and in particular to a gravity sensing device for electric motors. Background Technology

[0002] A crane is a multi-action lifting machine that vertically lifts and horizontally moves heavy objects within a certain range; and the bridge crane is the most widely used and numerous type of lifting machine; it is a lifting device that spans the airspace above workshops, warehouses and material yards to lift and transport materials.

[0003] Existing bridge cranes generally use electric hoists. For the objects being lifted, only a weight limit mark is made on the electric hoist. During actual operation, the operator cannot identify the weight of the object. This leads to the electric hoist often operating unintentionally under overload, which not only poses safety hazards but also greatly reduces the service life of the electric hoist. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a gravity sensing device for electric motors.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A gravity sensing device for an electric motor includes: an electric motor, a bearing mounted on the electric motor, and a gravity sensing device mounted on the bearing.

[0007] Preferably, the gravity sensing device includes an inner ring and an outer ring; a strain gap exists between the inner ring and the outer ring, which are connected by a strain beam; sensing holes are provided at both the top and bottom of the strain beam; and sensors are installed in the sensing holes.

[0008] Preferably, a limiting groove is also provided in the inner ring for mounting on the bearing.

[0009] Preferably, the strain beams are a pair, arranged symmetrically with respect to the inner ring center.

[0010] Compared with the prior art, this application has the following beneficial effects:

[0011] In existing bridge cranes, the lifting ropes are all mounted on the motor. The motor rotates to raise and lower the ropes. This invention mounts the gravity sensor on the motor's bearing. This design does not affect the motor's rotation, and when lifting heavy objects, the weight of the object is transmitted to the motor through the lifting rope, then to the bearing, and finally to the gravity sensor. The gravity data obtained by the gravity sensor is displayed on an external monitor via infrared connection. At this time, the operator can judge whether the object is overloaded based on the specific weight, solving the problem of blind lifting in existing technology and causing unnecessary dangers, while also improving the service life of the electric hoist. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only involve some embodiments of this utility model, and are not intended to limit this utility model.

[0013] Figure 1 This is a schematic diagram of the structure of a gravity sensing device for an electric motor according to the present invention;

[0014] Figure 2 for Figure 1 A schematic diagram of the structure assembled with the motor. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings. The components of the embodiments of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0016] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0017] Unless otherwise defined, the technical or scientific terms used in this patent document shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model patent specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "an," "a," or "the" do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" indicate that the element or object preceding "comprising" encompasses the element or object listed following "comprising" or its equivalents, and do not exclude other elements or objects. Terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are used only to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0018] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the features in the following embodiments can be combined with each other.

[0019] Example 1:

[0020] like Figure 2 As shown, a gravity sensing device for an electric motor includes: a motor 10, a bearing 20 mounted on the shaft of the motor 10, and a gravity sensing device 30 mounted on the bearing 20.

[0021] Using a motor equipped with a gravity sensor 30 in an electric hoist allows the weight of the object to be weighed in advance during lifting, thus determining whether the object is overloaded. If it is not overloaded, it can be lifted safely; if it is overloaded, the heavy object can be lowered, avoiding unnecessary dangers during transport. It also prevents the electric hoist from operating under overload conditions for extended periods, which would reduce its lifespan.

[0022] Of course, when the above-mentioned motor is used in an electric hoist, a gravity sensing device 30 needs to be installed on each of the motor shafts 10 on both sides of the hoisting rope to improve the accuracy of detecting the weight of the object.

[0023] like Figure 1 As shown, the gravity sensing device 30 includes an inner ring 31 and an outer ring 32; there is a strain gap 33 between the inner ring 31 and the outer ring 32, which is connected by a strain beam 34; the strain beam 34 has sensing holes 35 at both the top and bottom; a sensor 36 is installed in the sensing hole 35.

[0024] The gravity sensing device 30 is mounted on the limiting ring of the bearing 20 through the limiting groove 37 opened in the inner ring 31. The limiting ring limits the limiting groove 37 to prevent the gravity sensing device 30 from sliding out of the bearing 20 when it is subjected to force.

[0025] Among them, the strain beams 23 are a pair, symmetrically arranged with the center of the inner ring 21. When subjected to force, the inner ring 31 moves downward, causing the strain beams 23 on both sides to deform and transfer the stress to the sensor 36. The sensor 36 converts the stress change into weight data, which is transmitted through infrared and displayed on an external display.

[0026] Among them, the strain beam 23 has the ability to rebound. When the object is put down, the strain beam 23 returns to its original position, the stress disappears, and at the same time, the inner ring 31 is pulled back to its original position.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A gravity sensing device for use on an electric motor, characterized by, include: The motor (10), the bearing (20) mounted on the shaft of the motor (10), and the gravity sensing device (30) mounted on the bearing (20); the gravity sensing device (30) includes an inner ring (31) and an outer ring (32); there is a strain gap (33) between the inner ring (31) and the outer ring (32), which is connected by a strain beam (34); the strain beam (34) has sensing holes (35) on both the top and bottom; a sensor (36) is installed in the sensing hole (35).

2. A gravity sensing device for use on an electric motor as defined in claim 1, wherein, The inner ring (31) also has a limiting groove (37) for mounting on the bearing (20).

3. A gravity sensing device for use on an electric motor as defined in claim 1, wherein, The strain beams (34) are a pair, arranged symmetrically around the center of the inner ring (31).

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