Load cell and internal calibration structure thereof

Abstract

The application discloses an internal calibration mechanism of a load cell, which comprises an internal calibration driving structure, an internal calibration weight and an internal calibration weight support frame; the internal calibration weight support frame is provided with an opening or a slot, and the opening or the slot can bear the internal calibration weight; the internal calibration weight support frame is connected to the bearing part on both sides of the bearing part and the bearing part; the internal calibration weight support frame and the bearing part and the fixed part of the load cell are integrally formed; alternatively, the force transmission connecting part and the fulcrum connecting part of the internal calibration weight support frame are fixedly connected to the part, which extends to the bearing part, of the bearing part and the fixed part respectively; or the internal calibration weight support frame is connected to the bearing part on both sides of the bearing part through a spring sheet; and the part, which extends to the bearing part, of the internal calibration weight support frame and the fixed part are connected through a spring sheet. The application makes the sensor structure simple and compact, effectively reduces the size of the overall sensor and improves the calibration weighing performance.

Description

Technical Field

[0001] This invention relates to an internal calibration mechanism for weighing sensors in balances, particularly electronic balances. Background Technology

[0002] As the environment and time change, the load cells on electronic balances require recalibration to ensure weighing accuracy. Most electronic balances are equipped with a precision weight for calibration before weighing. Without a precision weight, the balance cannot be calibrated, rendering it unusable. Since the precision weight needs to be stored separately, this presents a significant inconvenience. The current solution involves adding an internal calibration mechanism to the electronic balance for automatic calibration. This eliminates the need for an external measuring weight, greatly simplifying the process for end-users.

[0003] The internal calibration mechanism, installed inside the electronic balance, brings convenience and accuracy in weighing, but also has a drawback: it occupies internal space. To ensure calibration accuracy, the larger the weighing range of the weighing sensor, the larger the mass of the internal calibration weights required. In the design of some large-range weighing sensors, due to size and space limitations, the size of the internal calibration weights cannot be too large. In this case, the weight and size of the internal calibration weights are limited, and therefore the corresponding mass during internal calibration cannot meet the weighing performance requirements of the weighing sensor's internal calibration. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the limitation of the mass and size of the internal calibration weights in the internal calibration mechanism of the existing electronic balance, and to provide an internal calibration mechanism.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] An internal calibration mechanism for a weighing sensor is provided, including an internal calibration drive structure and an internal calibration weight, characterized in that it also includes an internal calibration weight support frame;

[0007] The internal calibration weight support frame is symmetrically arranged on both sides of the load-bearing part of the weighing sensor. The internal calibration weight support frame has an opening or groove on the side away from the fixed part of the weighing sensor, and the opening or groove can support the internal calibration weight. The internal calibration drive structure can lift the internal calibration weight away from the internal calibration weight support frame or place it in the opening or groove of the internal calibration weight support frame.

[0008] The internal calibration weight support frame is connected to both sides of the load-bearing part and the load-bearing part, and the connection is a thin sheet structure; the internal calibration weight support frame and the part of the fixing part extending towards the load-bearing part are connected, and the connection is a thin sheet structure; the internal calibration weight support frame and the load-bearing part and fixing part of the weighing sensor are integrally formed;

[0009] or,

[0010] The inner calibration weight support frame includes an inner calibration weight support frame connecting part and an inner calibration weight support frame fulcrum part on the side away from the opening or slot; the connection between the inner calibration weight support frame connecting part and the main body of the inner calibration weight support frame is a thin sheet structure, and the inner calibration weight support frame connecting part is fixedly connected to the bearing part; the connection between the inner calibration weight support frame fulcrum part and the main body of the inner calibration weight support frame is a thin sheet structure, and the inner calibration weight support frame fulcrum part is fixedly connected to the part of the fixed part extending towards the bearing part;

[0011] or,

[0012] The internal calibration weight support frame is connected to the bearing part on both sides of the bearing part by springs;

[0013] The internal calibration weight support frame and the portion of the fixed part extending towards the bearing part are connected by a spring.

[0014] In this solution, the internal calibration drive structure and the internal calibration weight are existing mechanisms used to load or unload the internal calibration weight from the support frame, and will not be described in detail here. This solution does not limit the structure and form of the internal calibration drive structure and the internal calibration weight.

[0015] In this design, the internal calibration weight support frame and the load-bearing part are connected by springs or by cutting, etc. make it into The force is transmitted through a thin, sheet-like structure. The internal calibration weight support frame and fixing part are connected by springs. Alternatively, the connection point can be made into a thin sheet-like shape using cutting or other methods to achieve the fulcrum function of a lever.

[0016] The internal calibration structure of this solution amplifies the force applied to the weighing sensor by the internal calibration weights using the lever principle, while achieving a simpler and more compact internal calibration structure.

[0017] Furthermore, by using a one-piece molding method, the number of assembly parts can be further reduced, and the costs of processing, assembly, and logistics are also lower.

[0018] Furthermore, this solution simplifies and reduces assembly parts by using a separately designed internal calibration weight support frame, compared to spring plate installation, making it easier to process and assemble.

[0019] Furthermore, the load-bearing part, parallel guide part, fixing part and lever of the weighing sensor are integrally formed.

[0020] In this solution, the main body of the entire weighing sensor is molded as a single piece, reducing the types of parts in the weighing sensor and lowering costs for processing, assembly, and logistics.

[0021] Furthermore, when the main body of the weighing sensor and the internal calibration mechanism are both integrally molded, the types of parts of the weighing sensor can be further simplified, thereby reducing processing, assembly, and logistics costs.

[0022] Furthermore, the opening or groove of the internal calibration weight support frame is a V-shaped opening or groove.

[0023] This design incorporates a V-shaped opening or groove, which can stably support the internal calibration weights and prevent them from swaying on the support frame.

[0024] Furthermore, the connecting part and the fulcrum part of the inner calibration weight support frame are fixed to the bearing part and the fixing part respectively by rivets or welding.

[0025] Furthermore, the distance from the center line of the opening or groove of the support frame to the connection point between the inner calibration weight support frame and the fixing part is greater than the distance from the connection point between the inner calibration weight support frame and the bearing part to the connection point between the inner calibration weight support frame and the fixing part.

[0026] In this design, the weight of the internal calibration weights is amplified and transmitted to the bearing unit by setting a lever ratio.

[0027] A weighing sensor is also provided, including the internal calibration mechanism described above.

[0028] The positive and progressive effects of this invention are as follows:

[0029] The above method can obtain smaller internal calibration weights, and the corresponding power and size of the internal calibration motor can be reduced. Sizes are all acceptable. Making it very small allows for a simple and compact sensor structure, effectively reducing the overall size of the sensor. Increasing the size and improving the calibration weighing performance. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of a weighing sensor according to an embodiment of the present invention.

[0031] Figure 2 This is a schematic diagram of the internal calibration weight support frame of the weighing sensor according to an embodiment of the present invention.

[0032] Figure 3 This is a schematic diagram of an internal calibration weight support frame according to another embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures

[0034] 1 Weighing sensor

[0035] 11. Bearing section

[0036] 12 Fixing Part

[0037] 13 Parallel guide section

[0038] 14. Lever

[0039] 15. Magnetic System Structure

[0040] 16 Internal Schools

[0041] 161 Internal calibration drive structure

[0042] 162 Internal calibration weights

[0043] 163 Internal calibration weight support frame

[0044] 1631, 1631' Internal Calibration Weight Support Section

[0045] 1632, 1632' Internal Calibration Weight Support Frame Body

[0046] 1633, 1633' Internal Calibration Weight Support Frame Connection Part

[0047] 1634, 1634' Internal Calibration Weight Support Frame Support Point

[0048] 1635', 1636' connecting part Detailed Implementation

[0049] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0050] This invention can achieve a self-calibration weight many times heavier than the weight of the internal calibration weight itself by lever mechanism, even when the mass of the internal calibration weight is limited and the volume of the weighing sensor is limited. This solves the problem of needing a large internal calibration weight due to size and space constraints.

[0051] The following embodiments illustrate the implementation of the present invention.

[0052] like Figure 1 and Figure 2 In the embodiment shown, the weighing sensor 1 includes a bearing part 11, a fixing part 12, a parallel guide part 13, a lever 14, a magnetic system structure 15, and an internal calibration mechanism 16.

[0053] The supporting part 11, the parallel guide part 13, the fixing part 12, and the lever 14 are an integral structure, which is formed by molding a single piece of material. The integral structure in this embodiment can be a die-cast integral structure, a machined integral structure, or an integral structure obtained by die casting and machining.

[0054] The structure of the bearing part 11, parallel guide part 13, fixing part 12, lever 14 and magnetic system in this embodiment is consistent with the functions of the components that realize the force transmission of the weighing sensor in the prior art, so it will not be described again here.

[0055] The internal calibration mechanism 16 in this embodiment includes an internal calibration drive structure 161, an internal calibration weight 162, and an internal calibration weight support frame 163. The internal calibration weight support frame 163 is provided with a V-groove for loading or placing the internal calibration weight 162.

[0056] In this embodiment, the internal calibration weight support frame 163 is symmetrically arranged on both sides of the weighing sensor 1. The internal calibration drive mechanism 161 can lift the internal calibration weight 162 vertically along the paper and place it on the internal calibration weight support frame 163 for internal calibration. After the internal calibration is completed, the internal calibration drive mechanism 161 can also lift the internal calibration weight 162 vertically to remove it from the internal calibration weight support frame 163.

[0057] Therefore, the internal calibration weight 162 has a calibrated state and an uncalibrated state in the weighing sensor. When in the calibrated state, the internal calibration weight 162 is lifted by the internal calibration drive mechanism 161 and placed on the internal calibration weight support frame 163. Afterwards, the internal calibration drive mechanism 161 resets, at which point there is a gap between the internal calibration weight 162 and the internal calibration drive mechanism 161 in the vertical direction on the paper, meaning the internal calibration weight 162 is separated from the internal calibration drive mechanism 161. When in the uncalibrated state, the internal calibration drive mechanism 161 pushes the internal calibration weight 162 upwards. Weight 162 is placed on the internal calibration drive mechanism 161, and the internal calibration weight support frame 163 is connected to the internal calibration weight 16. 2. There is a gap in the vertical direction of the paper, that is, the inner calibration weight support frame 163 is separated from the inner calibration weight 162.

[0058] like Figure 2 As shown, the internal calibration weight support frame 163 includes an internal calibration weight support part 1631 for holding the internal calibration weight 162 for internal calibration, an internal calibration weight support frame body part 1632, and an internal calibration weight support frame connecting part 1633 connected to the load-bearing part 11 of the load cell. The connection between the internal calibration weight support frame connecting part 1633 and the load-bearing part 11 is cut into an elastic sheet to transmit force. The function of the elastic sheet is the same as that of the connecting spring in the load cell assembled in the prior art, and will not be described again here. The internal calibration weight support frame fulcrum part 1634, which is connected to the extension of the fixing part 12, is cut into an elastic sheet to act as a lever support point; the function of the elastic sheet is the same as that of the fulcrum connecting spring in the load cell assembled in the prior art, and will not be described again here.

[0059] In this embodiment, the internal calibration mechanism 16, the supporting part 11, the parallel guide part 13, the fixing part 12, and the lever 14 are an integral structure, formed from a single piece of material. This integrated manufacturing reduces the number of parts, thereby effectively reducing costs associated with processing, transportation, and storage. It also results in good sensor performance consistency, convenient assembly, and improved assembly efficiency.

[0060] like Figure 2 As shown, the distance from the weight support center of the internal calibration weight support part 1631 to the fulcrum part 1634 of the internal calibration weight support frame connected to the fixed part 12 is a, and the distance from the connecting part 1633 of the internal calibration weight support frame to the fulcrum part 1634 of the internal calibration weight support frame connected to the fixed part 12 is b. If the weight of the internal calibration weight 162 is W, according to the lever principle, the mass loaded onto the bearing part 11 is W*a / b. Using the lever ratio, the weight W*a / b loaded onto the bearing part 11 by the internal calibration weight support frame 163 is significantly increased compared to W, making it easier to meet the internal calibration weight requirements of large-range weights, complete the calibration of the sensor, and thus better meet the performance requirements, thereby improving the accuracy of the weighing sensor.

[0061] In another embodiment, the internal calibration weight support frame 163' adopts a separate structure. For example... Figure 3 As shown, the internal calibration weight support frame 163' includes an internal calibration weight support part 1631', an internal calibration weight support frame body part 1632', an internal calibration weight support frame connecting part 1633', an internal calibration weight support frame fulcrum part 1634', a connecting part 1635' connecting the bearing part 11, and a connecting part 1636' connecting the fixing part 12.

[0062] In this embodiment, the thin-plate structure between the various components of the internal calibration weight support frame 163' replaces the connecting spring and fulcrum spring, reducing the types of parts and facilitating assembly.

[0063] The internal calibration weight support frame 163', the load-bearing part 11, and the fixing part 12 are connected by a fixed connection method, such as screw connection, or other connection methods such as riveting and welding. There are two internal calibration weight support frames 163', which are respectively set on both sides of the weighing sensor 1.

[0064] The internal calibration weight support frame 163' in this embodiment adopts a split structure, which can reduce the processing difficulty and processing cost, while also meeting the high performance requirements of the weighing sensor.

[0065] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. An internal calibration mechanism for a weighing sensor, comprising an internal calibration drive structure and an internal calibration weight, characterized in that, It also includes an internal calibration weight support frame; The internal calibration weight support frame is symmetrically arranged on both sides of the load-bearing part of the weighing sensor. The internal calibration weight support frame has an opening or groove on the side away from the fixed part of the weighing sensor, and the opening or groove can support the internal calibration weight. The internal calibration drive structure can lift the internal calibration weight out of the internal calibration weight support frame or place it in the opening or slot of the internal calibration weight support frame. The inner calibration weight support frame includes an inner calibration weight support frame connecting part and an inner calibration weight support frame fulcrum part on the side away from the opening or slot; the connection between the inner calibration weight support frame connecting part and the main body of the inner calibration weight support frame is a thin sheet structure, and the inner calibration weight support frame connecting part is fixedly connected to the bearing part; the connection between the inner calibration weight support frame fulcrum part and the main body of the inner calibration weight support frame is a thin sheet structure, and the inner calibration weight support frame fulcrum part is fixedly connected to the part of the fixed part extending towards the bearing part.

2. The internal calibration mechanism of the weighing sensor as described in claim 1, characterized in that, The internal calibration weight support frame and the load-bearing and fixing parts of the weighing sensor are integrally formed.

3. The internal calibration mechanism of the weighing sensor as described in claim 1, characterized in that, The internal calibration weight support frame and the load-bearing and fixing parts of the weighing sensor are connected by a separate structure.

4. The internal calibration mechanism of the weighing sensor as described in claim 1, characterized in that, The load-bearing part, parallel guide part, fixing part and lever of the weighing sensor are integrally formed.

5. The internal calibration mechanism of the weighing sensor as described in claim 1, characterized in that, The opening or groove of the internal calibration weight support frame is a V-shaped opening or groove.

6. The internal calibration mechanism of the weighing sensor as described in claim 1, characterized in that, The connecting part and the fulcrum part of the internal calibration weight support frame are fixed to the bearing part and the fixing part respectively by rivets or welding.

7. The internal calibration mechanism of the weighing sensor as described in any one of claims 1-6, characterized in that, The distance from the center line of the opening or groove of the support frame to the connection point between the inner calibration weight support frame and the fixing part is greater than the distance from the connection point between the inner calibration weight support frame and the bearing part to the connection point between the inner calibration weight support frame and the fixing part.

8. A weighing sensor, characterized in that, The load cell is equipped with an internal calibration mechanism for the load cell as described in any one of claims 1-7 on one side of its load-bearing portion.

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