Beam type weighing sensor

Abstract

The utility model provides a beam-type weighing sensor, which is a single-beam weighing sensor and comprises a sensor main beam provided with a through hole; one end parts of the annular flexible connecting pieces are fixed on the sensor main beam, are respectively arranged on the outer sides of the two end parts of the through hole in a surrounding manner, and extend outwards; one end of each annular rigid connecting piece is fixed to the other end of the corresponding annular flexible connecting piece, and the annular rigid connecting pieces extend outwards; the at least one pair of sealing pieces are respectively fixed at the other end parts of the corresponding annular rigid connecting pieces; a sealed cavity is formed among the sealing piece, the annular rigid connecting piece, the annular flexible connecting piece and the sensor main beam. According to the utility model, a structure combining the flexible connecting piece, the sealing piece and the rigid connecting piece is adopted. During loading deformation, the influence of welding stress between the sealing element and the rigid connecting element on the sensor is small, and the precision and reliability of the sensor are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of force or weighing sensor, especially relates to a beam type weighing sensor. BACKGROUND

[0002] In the prior art, the beam type weighing sensor is widely used in platform scale and process weighing such as tank, and the capacity range is usually 0.22t to 4.4t. The existing beam type weighing sensor structure is relatively simple, and is usually suitable for the sensor with a capacity of more than 1t.

[0003] However, when the beam type weighing sensor is made to a small capacity of 0.5t and below, the contribution of the welded sealing element to the SPAN is about 3% or more, because the hysteresis performance of the sealing element is very poor, thereby causing the hysteresis performance of the sensor to be very poor, and it is difficult to achieve high precision.

[0004] For this, at present, the hysteresis performance is mainly reduced by customizing special strain gauges, the dependence on the strain gauges is high, and the consistency of the small capacity hysteresis is poor, and the qualified rate is not high.

[0005] Therefore, the present application inventors design a beam type weighing sensor to overcome the above technical problems. UTILITY MODEL CONTENTS

[0006] The utility model wants to solve the technical problem that the hysteresis performance of the beam type weighing sensor is poor when the capacity is small, and it is difficult to achieve high precision in the prior art, and provides a beam type weighing sensor.

[0007] The utility model solves the above technical problem through the following technical scheme:

[0008] A beam type weighing sensor, characterized in that the beam type weighing sensor is a single-beam weighing sensor, comprising:

[0009] A sensor main beam, a through hole is formed in the sensor main beam;

[0010] At least one pair of annular flexible connecting pieces, one end of the annular flexible connecting piece is fixed on the sensor main beam, is respectively arranged outside the two end portions of the through hole, and extends outward;

[0011] At least one pair of annular rigid connecting pieces, one end of the annular rigid connecting piece is respectively fixed on the other end of the corresponding annular flexible connecting piece, and extends outward;

[0012] At least one pair of sealing elements are respectively fixed on the other end of the corresponding annular rigid connecting piece;

[0013] The sealing member, the annular rigid connecting member, the annular flexible connecting member and the sensor main beam form a closed cavity.

[0014] According to one embodiment of the present application, one end of the annular flexible connecting member is aligned with the outer edge of the through hole.

[0015] According to one embodiment of the present application, one end of the annular flexible connecting member is located outside the outer edge of the through hole.

[0016] According to one embodiment of the present application, the wall thickness of the annular rigid connecting member is greater than the wall thickness of the annular flexible connecting member.

[0017] According to one embodiment of the present application, the sensor main beam is provided with a groove on each side, and the annular flexible connecting member and the annular rigid connecting member are respectively located in the corresponding grooves.

[0018] According to one embodiment of the present application, the sealing member is a flexible sealing member.

[0019] According to one embodiment of the present application, the outer edge of the sealing member is sealingly connected with the upper end surface of the annular rigid connecting member.

[0020] According to one embodiment of the present application, the annular flexible connecting member and the annular rigid connecting member adopt an integrated structure.

[0021] According to one embodiment of the present application, the sensor main beam is provided with a plurality of flexible walls, and the sensor main beam is provided with a strain gauge at a position corresponding to the flexible wall on the inner wall surface.

[0022] According to one embodiment of the present application, the annular flexible connecting member is perpendicular to the sensor main beam.

[0023] The positive progress effect of the present application is that:

[0024] The beam type load cell of the present application adopts the structure combined with the flexible connecting member, the sealing member and the rigid connecting member. When the deformation is loaded, the welding stress between the sealing member and the rigid connecting member has little influence on the sensor, thereby improving the precision and reliability of the sensor. The hysteresis and creep characteristics of the sealing member have little influence on the sensor, thereby improving the consistency and precision of the sensor performance. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above and other features, properties and advantages of the present application will become more apparent through the following description with reference to the accompanying drawings and embodiments, wherein the same reference numerals always denote the same features, and wherein:

[0026] Figure 1 It is a perspective view of the beam type load sensor.

[0027] Figure 2 It is Figure 1 It is a sectional view along A-A line.

[0028] Figure 3 It is a front view of the beam type load sensor.

[0029]

Reference signs

[0030] Sensor main beam 10

[0031] Annular flexible connecting piece 20

[0032] Annular rigid connecting piece 30

[0033] Sealing piece 40

[0034] Through hole 11

[0035] Closed cavity H

[0036] Groove 12

[0037] Flexible wall 13 DETAILED DESCRIPTION

[0038] In order to make the above objects, characteristics and advantages of the utility model more obvious and easy to understand, the following will make detailed description on the specific implementation of the utility model combined with the drawings.

[0039] The embodiments of the utility model will now be described in detail with reference to the drawings. The embodiments of the utility model will now be described in detail with reference to the preferred embodiments of the utility model, examples of which are shown in the drawings. In any possible case, the same signs will be used in all the drawings to indicate the same or similar parts.

[0040] In addition, although the terms used in the utility model are selected from the commonly known and used terms, some terms mentioned in the utility model specification can be selected by the applicant according to his or her judgment, and the detailed meanings are explained in the relevant part of the description herein.

[0041] In addition, the utility model is required to be understood not only through the actual terms used, but also through the meaning contained in each term.

[0042] As Figures 1 to 3 As shown in the utility model, a kind of beam type load sensor is disclosed, the beam type load sensor is mainly single-beam load sensor, single-beam in the application refers to the load end 100 and mounting end 200 of load sensor only set one beam, i.e. Figure 1 Sensor main beam 10 (as shown).

[0043] The beam load cell comprises a sensor main beam 10, at least one pair of annular flexible connectors 20, at least one pair of annular rigid connectors 30, and at least one pair of sealing members 40. A through hole 11 is formed in the sensor main beam 10 (as shown in the structure, which is through in the front-rear direction of the paper). One end of the annular flexible connector 20 is fixed on the sensor main beam 10 and extends outward around the two ends of the through hole 11. One end of the annular rigid connector 30 is fixed on the other end of the corresponding annular flexible connector 20 and extends outward. The sealing member 40 is fixed on the other end of the corresponding annular rigid connector 30. For example, the sealing member 40 is welded on the annular rigid connector 30. Figure 3

[0044] This structure makes the annular flexible connector 20, the annular rigid connector 30, and the sealing member 40 connected in sequence, and the structures of the three can be integrally formed by a processing technology (such as 3D printing). Alternatively, the annular flexible connector 20 and the annular rigid connector 30 are integrally formed by a processing technology, and then the annular flexible connector 20 is fixedly connected (such as welded) on the through hole 11 to form an integrated structure.

[0045] Through the above structure, a closed cavity H is formed between the sealing member 40, the annular rigid connector 30, the annular flexible connector 20, and the sensor main beam 10. In this way, the beam load cell can be applied to a humid environment (such as a humid environment in a liquid), and the influence of the humid environment on the load cell can be effectively avoided by forming a closed cavity. In an embodiment, one end of the annular flexible connector 20 can be arranged to be aligned with the outer edge of the through hole 11. Alternatively, in another embodiment, one end of the annular flexible connector 20 can be arranged to be located outside the outer edge of the through hole 11 (as shown in the structure). Figure 2

[0046] Preferably, the annular flexible connector 20 is arranged perpendicular to the sensor main beam 10, or the annular flexible connector 20 can be arranged to be inclinedly connected to the sensor main beam 10. Of course, the two connection structures are only examples and are not limiting, and other connection methods are also within the protection scope of the present application.

[0047] Preferably, the wall thickness of the annular rigid connector 30 is greater than the wall thickness of the annular flexible connector 20. In this way, the rigidity of the annular rigid connector 30 can be increased, and when the annular flexible connector 20 deforms with the sensor main beam 10, the annular rigid connector 30 can basically not deform, thereby isolating the stress from the sensor main beam 10 to the sealing member 40, reducing the influence of the sealing member 40 and the annular rigid connector 30 on the deformation of the sensor main beam 10, and thereby improving the measurement accuracy. ​​

[0048] As Figure 2 Further preferably, as shown in the drawings, a groove 12 is formed on each side of the sensor main beam 10, and the annular flexible connecting member 20 and the annular rigid connecting member 30 are respectively located in the corresponding groove 12.

[0049] The sealing member 40 is preferably a flexible sealing member, and the two ends of the sealing member 40 are respectively sealed and connected (for example, welded) to the two ends of the annular rigid connecting member 30. The welding stress between the flexible sealing member and the annular rigid connecting member 30 has little effect on the sensor, improving the accuracy and reliability of the sensor. The flexible sealing member is preferably a thin-walled member, such as a thin-walled metal member, which can be formed by stamping.

[0050] At the same time, the hysteresis and creep characteristics of the flexible sealing member have little effect on the sensor, improving the consistency and accuracy of the sensor performance.

[0051] As Figure 3 As shown in the drawings, the sensor main beam 10 is provided with a plurality of flexible walls 13, and strain gauges are arranged on the inner wall surface of the sensor main beam 10 at positions corresponding to the flexible walls 13, and the strain gauges are attached to the closed cavity H.

[0052] According to the above structural description, when the sensor main beam 10 is loaded and deformed, the annular flexible connecting member 20 deforms along with it. Since the annular rigid connecting member 30 has high rigidity, it does not deform substantially. In this way, the deformation of the sealing member 40 is small, and it has little effect on the SPAN (range, the range between the maximum and minimum input signals that the sensor can measure) of the sensor. The annular flexible connecting member 20 serves to isolate the transmission of stress from the sensor main beam 10 to the sealing member 40.

[0053] The beam type load cell can be applied to platform scales, chemical industry, food industry, pharmaceutical industry and other industries for weighing and batching and process control. In particular, for small-capacity tanks or platform scales below 500 kg, the beam type load cell can significantly improve the accuracy.

[0054] In summary, the beam type load cell of the present application adopts a structure combining a flexible connecting member, a sealing member and a rigid connecting member. When loaded and deformed, the welding stress between the sealing member and the rigid connecting member has little effect on the sensor, improving the accuracy and reliability of the sensor. The hysteresis and creep characteristics of the sealing member have little effect on the sensor, improving the consistency and accuracy of the sensor performance.

[0055] The above-described disclosure merely provides examples for those skilled in the art, and does not constitute a limitation on the present application. Although the present application is not explicitly described, those skilled in the art can make various modifications, improvements and corrections to the present application. Such modifications, improvements and corrections are suggested in the present application, so such modifications, improvements and corrections still belong to the spirit and scope of the exemplary embodiments of the present application.

[0056] Meanwhile, the present application uses specific words to describe the embodiments of the present application. As "one embodiment", "an embodiment", and / or "some embodiments" means a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that the "an embodiment" or "one embodiment" or "an alternative embodiment" mentioned in different places in the specification twice or more does not necessarily mean the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be properly combined.

[0057] Similarly, it should be noted that, in order to simplify the description of the present application and to help understand one or more embodiments of the present application, the foregoing description of the embodiments of the present application sometimes combines various features into one embodiment, figure or description thereof. However, this method of disclosure does not mean that the features required by the present application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiments disclosed above. Some embodiments use numbers to describe components, attributes and quantities. It should be understood that such numbers used in the description of the embodiments are modified by the modifier "about", "approximately" or "generally" in some examples.

[0058] Although the above describes the specific embodiments of the present application, those skilled in the art should understand that these are only illustrative, the protection scope of the present application 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 application. However, these changes and modifications all fall within the protection scope of the present application.

Claims

1. A beam-type load cell, characterized in that, The beam-type load cell is a single-beam load cell, comprising: A sensor main beam, wherein a through hole is formed on the sensor main beam; At least one pair of annular flexible connectors, one end of which is fixed to the main beam of the sensor, respectively surrounding the two ends of the through hole and extending outward; At least one pair of annular rigid connectors, one end of each annular rigid connector being fixed to the other end of the corresponding annular flexible connector and extending outward; At least one pair of seals are respectively fixed to the other end of the corresponding annular rigid connector; A sealed cavity is formed between the sealing element, the annular rigid connector, the annular flexible connector, and the sensor main beam.

2. The beam-type load cell as described in claim 1, characterized in that, One end of the annular flexible connector is aligned with the outer edge of the through hole.

3. The beam-type load cell as described in claim 1, characterized in that, One end of the annular flexible connector is located outside the outer edge of the through hole.

4. The beam-type load cell as described in claim 1, characterized in that, The wall thickness of the annular rigid connector is greater than the wall thickness of the annular flexible connector.

5. The beam-type load cell as described in claim 1, characterized in that, A groove is formed on each side of the main beam of the sensor, and the annular flexible connector and the annular rigid connector are respectively located in the corresponding grooves.

6. The beam-type load cell as described in claim 1, characterized in that, The sealing element is a flexible sealing element.

7. The beam-type load cell as described in claim 6, characterized in that, The outer edge of the seal is sealed to the upper end face of the annular rigid connector.

8. The beam-type load cell as described in claim 1, characterized in that, The annular flexible connector and the annular rigid connector are integrally formed.

9. The beam-type load cell as described in claim 1, characterized in that, The sensor main beam is provided with multiple flexible walls, and strain gauges are provided on the inner wall surface of the sensor main beam at positions corresponding to the flexible walls.

10. The beam-type load cell as described in claim 1, characterized in that, The annular flexible connector is perpendicular to the main beam of the sensor.

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