Overload protection device for weighing sensor

Abstract

The utility model discloses a weighing sensor overload protection device which comprises a weighing plate and a supporting plate, a weighing sensor is installed on the lower side of the weighing plate, a strong magnet is arranged below the weighing sensor, an electromagnet is installed on the upper side of the supporting plate, and the electromagnet corresponds to the strong magnet. A magnetic field generated when the electromagnet is electrified to work is mutually exclusive to the strong magnet, and a plurality of protective columns are fixed on the lower side of the weighing plate. According to the weighing sensor overload protection device, the weighing sensor is pushed through the magnetic resistance to weigh an external object, the magnetic resistance mode can be used for overload protection of the weighing sensor, the situation that the weighing sensor is extruded and damaged due to the fact that the external object is too heavy is avoided, meanwhile, a deformation space is reserved in the mode, and the deformation space is extruded when the external object is too heavy; when the deformation space is filled, the deformation space is supported and protected by the protective columns, so that the influence of the protective columns on the numerical measurement of the weighing sensor can be reduced, and the overload protection of the weighing sensor can be realized.

Description

Technical Field

[0001] This utility model relates to the field of weighing device technology, specifically to an overload protection device for a weighing sensor. Background Technology

[0002] Load cells, as electronic components that convert weight signals into electrical signals and output them, are typically installed in weighing devices for detecting the weight of external objects. Common load cells include photoelectric load cells, hydraulic load cells, and capacitive load cells. Each type of sensor has a maximum load-bearing range during operation. If the weight of the external object exceeds the load cell's capacity, it can easily damage the load cell. Currently, to prevent damage from excessively heavy external objects, overload protection components, such as support columns and limit columns, are usually installed inside the sensor. While these structures provide overload protection, they can affect the accuracy of the weighing reading, resulting in a deficiency in the load cell's performance. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the existing defects and provide an overload protection device for a weighing sensor. The device uses magnetoresistive force to drive the weighing sensor to weigh external objects. The magnetoresistive method can be used for overload protection of the weighing sensor to prevent the weighing sensor from being crushed and damaged due to excessive weight of the external object. At the same time, the device has reserved deformation space. When the weight of the external object is too large, it will compress the deformation space. After the deformation space is filled, it is supported and protected by a protective column. This can reduce the influence of the protective column on the numerical measurement of the weighing sensor and can also be used for overload protection of the weighing sensor, which can effectively solve the problems in the background technology.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an overload protection device for a weighing sensor, comprising a weighing plate and a support plate. A weighing sensor is installed on the lower side of the weighing plate, and a strong magnet is disposed below the weighing sensor. An electromagnet is installed on the upper side of the support plate, and the electromagnet is disposed corresponding to the strong magnet. When the electromagnet is energized, the magnetic field generated therein repels the strong magnet. Several protective posts are fixed on the lower side of the weighing plate, and a movable gap is reserved between the protective posts and the support plate. The weighing plate and the support plate are connected and positioned by a connector.

[0005] As a preferred technical solution of this utility model, the connecting member includes a first protective frame and a second protective frame. The first protective frame is fixed to the middle of the lower side of the weighing plate, and the second protective frame is fixed to the middle of the upper side of the support plate. The first protective frame covers the outside of the second protective frame, and the first protective frame and the second protective frame are slidably connected. The strong magnet is located inside the first protective frame, and the electromagnet is located inside the second protective frame.

[0006] As a preferred embodiment of the present invention, a sliding hole is provided on the side of the first protective frame, and a positioning plate is fixed on the side of the second protective frame, wherein the positioning plate is slidably disposed in the sliding hole.

[0007] As a preferred embodiment of this utility model, a shielding plate is fixed inside the first protective frame, and the shielding plate is located between the weighing sensor and the strong magnet.

[0008] As a preferred embodiment of this utility model, a controller and a battery pack are installed on the lower side of the weighing plate, and protective pads are provided on the upper side of the support plate corresponding to the positions of the controller and the battery pack. An installation groove is provided on the upper side of the weighing plate, and a display screen is installed in the installation groove.

[0009] As a preferred technical solution of this utility model, a plurality of elastic support members are provided between the weighing plate and the support plate. The elastic support members are springs, one end of which is fixed to the lower part of the side of the weighing plate, and the other end of which is fixed to the upper part of the side of the support plate.

[0010] As a preferred embodiment of this utility model, a protective cover is provided between the weighing plate and the support plate. One end of the protective cover is fixed at the edge of the weighing plate, and the other end of the protective cover is fixed at the edge of the support plate. Several rubber pads are installed at the bottom of the support plate.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] The overload protection device for the weighing sensor of this utility model uses magnetoresistive force to drive the weighing sensor to weigh external objects. The magnetoresistive method can be used for overload protection of the weighing sensor to prevent the weighing sensor from being crushed and damaged due to excessive weight of the external object. At the same time, the method has reserved deformation space. When the weight of the external object is too large, it will compress the deformation space. After the deformation space is filled, it is supported and protected by the protective column. This can reduce the influence of the protective column on the numerical measurement of the weighing sensor and can also be used for overload protection of the weighing sensor. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the structure of the protective cover after it has been cut open.

[0015] Figure 3 for Figure 2 A schematic diagram of the structure after the first and second protective frames have been cut open.

[0016] Figure 4 for Figure 3 A magnified structural diagram of point A in the middle.

[0017] In the diagram: 1 Weighing plate, 2 Support plate, 3 Display screen, 4 First protective frame, 5 Second protective frame, 51 Positioning plate, 6 Weighing sensor, 7 Shielding plate, 8 Strong magnet, 9 Electromagnet, 10 Protective column, 11 Spring, 12 Controller, 13 Battery pack, 14 Protective pad, 15 Rubber pad foot, 16 Protective cover. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-4 This utility model provides a technical solution: a weighing sensor overload protection device, including a weighing plate 1 and a support plate 2. A weighing sensor 6 is installed on the lower side of the weighing plate 1, and a strong magnet 8 is arranged below the weighing sensor 6. An electromagnet 9 is installed on the upper side of the support plate 2, and the electromagnet 9 is arranged corresponding to the strong magnet 8. When the electromagnet 9 is energized, the magnetic field generated is mutually repelled by the strong magnet 8. When using this device, the electromagnet 9 is controlled to generate magnetic force, which pushes the strong magnet 8 to squeeze the weighing sensor 6. The initial value is set to 0. When an object is placed on the weighing plate 1, the weighing plate 1 is compressed, causing the weighing sensor 6 and the strong magnet 8 to move downward. The distance between the strong magnet 8 and the electromagnet 9 changes, and the force on the weighing sensor 6 changes, thereby realizing the weighing of the object on the weighing plate 1. In this way, the electromagnet 9 and the strong magnet 8 do not make substantial contact due to magnetic resistance, thereby avoiding damage to the weighing sensor 6 due to excessive weight of the object on the weighing plate 1, and facilitating the overload protection of the weighing sensor 6.

[0020] Several protective posts 10 are fixed on the lower side of the weighing plate 1, and an movable gap is reserved between the protective posts 10 and the support plate 2. The movable gap provides space for the change of distance between the electromagnet 9 and the strong magnet 8. This space is also the deformation space of this device. When an item is placed on the upper side of the weighing plate 1, the deformation space is squeezed. When the item is too heavy, the deformation space is compressed and disappears. Then the protective posts 10 contact the support plate 2. The protective posts 10 support and limit the weighing plate 1, preventing the weighing sensor 6 from being damaged by excessive force, and facilitating the overload protection of the weighing sensor 6.

[0021] The weighing plate 1 and the support plate 2 are connected and positioned by a connector, which includes a first protective frame 4 and a second protective frame 5. The first protective frame 4 is fixed to the lower middle part of the weighing plate 1, and the second protective frame 5 is fixed to the upper middle part of the support plate 2. The first protective frame 4 covers the outside of the second protective frame 5, and the first protective frame 4 and the second protective frame 5 are slidably connected. The strong magnet 8 is located inside the first protective frame 4, and the electromagnet 9 is located inside the second protective frame 5. The first protective frame 4 is used for the installation and protection of the weighing sensor 6 and the strong magnet 8, and the second protective frame 5 is used for the installation and protection of the electromagnet 9. At the same time, the sliding connection between the first protective frame 4 and the second protective frame 5 limits and guides the downward movement of the weighing plate 1 under force, which facilitates the use of this device.

[0022] The first protective frame 4 has a sliding hole on its side, and the second protective frame 5 has a positioning plate 51 fixed on its side. The positioning plate 51 is slidably disposed in the sliding hole. The positioning plate 51 is used to limit the connection between the first protective frame 4 and the second protective frame 5, so as to prevent the weighing plate 1 and the support plate 2 from separating.

[0023] A shielding plate 7 is fixed inside the first protective frame 4, and the shielding plate 7 is located between the load cell 6 and the strong magnet 8. The material of the shielding plate 7 includes, but is not limited to, ferromagnetic materials or superconducting materials. The shielding plate 7 is set to reduce the influence of the strong magnet 8 on the load cell 6, so as to facilitate the use of the load cell 6.

[0024] A controller 12 and a battery pack 13 are installed on the lower side of the weighing plate 1. The controller 12 is preferably a PLC controller. The controller 12 is used for the operation of the electronic components in this device. The battery pack 13 includes, but is not limited to, a lithium battery pack or a graphene battery pack. The battery pack 13 is used to power the electronic components in this device. Protective pads 14 are provided on the upper side of the support plate 2 at the positions corresponding to the controller 12 and the battery pack 13. During the weighing process, the protective pads 14 are used to protect the controller 12 and the battery pack 13. An installation groove is opened on the upper side of the weighing plate 1, and a display screen 3 is installed in the installation groove. The display screen 3 is used to display the weighing value. The weight signal detected by the weighing sensor 6 is transmitted to the controller 12, and after being processed by the controller 12, it is displayed on the display screen 3 in numerical form.

[0025] Several elastic support components are provided between the weighing plate 1 and the support plate 2. The elastic support component is a spring 11. One end of the spring 11 is fixed to the lower side of the weighing plate 1, and the other end of the spring 11 is fixed to the upper side of the support plate 2. The spring 11 is used for supporting and limiting the weighing plate 1 and the support plate 2, and at the same time plays a certain auxiliary role in the overload protection of the weighing sensor 6.

[0026] A protective cover 16 is provided between the weighing plate 1 and the support plate 2. One end of the protective cover 16 is fixed to the edge of the weighing plate 1, and the other end of the protective cover 16 is fixed to the edge of the support plate 2. The protective cover 16 is used to protect the components between the weighing plate 1 and the support plate 2. Several rubber pads 15 are installed at the bottom of the support plate 2. The rubber pads 15 improve the stability of the device after it is placed and prevent the device from sliding during use.

[0027] This overload protection device for a load cell uses magnetoresistive force to drive the load cell to weigh external objects. The magnetoresistive method can be used for overload protection of the load cell, preventing damage caused by excessive weight of the external object. At the same time, this method has a reserved deformation space. When the weight of the external object is too large, it will compress the deformation space. After the deformation space is filled, it is supported and protected by a protective column. This can reduce the influence of the protective column on the numerical measurement of the load cell and can also be used for overload protection of the load cell.

[0028] The parts not disclosed in this utility model are all prior art, and their specific structures, materials, and working principles will not be described in detail. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A weighing sensor overload protection device, comprising a weighing plate (1) and a support plate (2), characterized in that: A weighing sensor (6) is installed on the lower side of the weighing plate (1), and a strong magnet (8) is set below the weighing sensor (6). An electromagnet (9) is installed on the upper side of the support plate (2), and the electromagnet (9) is set corresponding to the strong magnet (8). When the electromagnet (9) is energized, the magnetic field generated is mutually repulsive to the strong magnet (8). Several protective columns (10) are fixed on the lower side of the weighing plate (1), and an movable gap is reserved between the protective columns (10) and the support plate (2). The weighing plate (1) and the support plate (2) are connected and positioned by connectors.

2. The overload protection device for the weighing sensor according to claim 1, characterized in that: The connector includes a first protective frame (4) and a second protective frame (5). The first protective frame (4) is fixed to the lower middle part of the weighing plate (1), and the second protective frame (5) is fixed to the upper middle part of the support plate (2). The first protective frame (4) covers the outside of the second protective frame (5), and the first protective frame (4) and the second protective frame (5) are slidably connected. The strong magnet (8) is located inside the first protective frame (4), and the electromagnet (9) is located inside the second protective frame (5).

3. The overload protection device for the weighing sensor according to claim 2, characterized in that: The first protective frame (4) has a sliding hole on its side, and the second protective frame (5) has a positioning plate (51) fixed on its side. The positioning plate (51) is slidably disposed in the sliding hole.

4. The overload protection device for the weighing sensor according to claim 2, characterized in that: The first protective frame (4) has a shielding plate (7) fixed inside, and the shielding plate (7) is located between the weighing sensor (6) and the strong magnet (8).

5. The overload protection device for the weighing sensor according to claim 1, characterized in that: The weighing plate (1) is equipped with a controller (12) and a battery pack (13) on its lower side. The support plate (2) is provided with protective pads (14) on its upper side corresponding to the positions of the controller (12) and the battery pack (13). The weighing plate (1) is provided with an installation groove on its upper side, and a display screen (3) is installed in the installation groove.

6. The overload protection device for the weighing sensor according to claim 1, characterized in that: A plurality of elastic support members are provided between the weighing plate (1) and the support plate (2). The elastic support members are springs (11). One end of the spring (11) is fixed to the lower side of the weighing plate (1), and the other end of the spring (11) is fixed to the upper side of the support plate (2).

7. The overload protection device for the weighing sensor according to claim 1, characterized in that: A protective cover (16) is provided between the weighing plate (1) and the support plate (2). One end of the protective cover (16) is fixed at the edge of the weighing plate (1), and the other end of the protective cover (16) is fixed at the edge of the support plate (2). Several rubber pads (15) are installed at the bottom of the support plate (2).

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