Anti-impact structure and weighing sensor assembly

Abstract

The utility model provides an anti-impact structure for a weighing sensor assembly, the weighing sensor assembly comprises a mounting plate and an elastic body, a gap exists between at least part of the mounting plate and the elastic body, the anti-impact structure comprises a damping part located in the gap, and the utility model further provides the weighing sensor assembly comprising the anti-impact structure. According to the anti-impact structure, the damping part used for limiting is arranged so that limiting can be performed and displacement and amplitude can be limited when the weighing sensor assembly is impacted, and the amplitude of the elastic body can be rapidly attenuated to a normal balance position by utilizing energy consumption when the elastic body impacts the damping limiting part; therefore, the anti-impact performance of the weighing sensor is obviously improved.

Description

Technical Field

[0001] The utility model relates to the field of weighing sensors, and particularly to the field of anti-impact structures of weighing sensors. Background Art

[0002] During the use of weighing sensors and their components, the weighing accuracy often suffers losses due to the action of impact loads. The current common practice is to install metal limit blocks at the ends of weighing sensors, or to set limit components such as convex steps on the elastic bodies of weighing sensors. The limit components are mostly made of metal. However, in actual weighing systems, due to the cooperation relationship and dimensional tolerances between components, the metal limit components cannot achieve good anti-impact effects. For example, if the limit gap is too large, the limit function fails; if the limit gap is too small, it is difficult to install the weighing sensor. Summary of the Utility Model

[0003] An object of the utility model is to provide an anti-impact structure that can endow a weighing sensor with better anti-impact performance.

[0004] The anti-impact structure for achieving the above object is used for a weighing sensor assembly. The weighing sensor assembly includes a mounting plate and an elastic body. There is a gap between at least part of the mounting plate and the elastic body. The anti-impact structure includes a damping member located in the gap.

[0005] In one or more embodiments, the damping member is a viscoelastic material.

[0006] In one or more embodiments, the damping member is a solid provided on the mounting plate and / or the elastic body. The maximum thickness of the damping member is set such that when the weighing sensor is subjected to a load within 1.5 times the range, the damping member fills at least part of the gap.

[0007] In one or more embodiments, the quasi-static modulus range of the viscoelastic material is 0.8 - 1.2 Gpa.

[0008] In one or more embodiments, the damping member is a viscoelastic fluid that fills at least part of the gap.

[0009] In one or more embodiments, the damping member is one or more layers of viscoelastic solid layered members.

[0010] In one or more embodiments, the damping member includes a viscoelastic solid layered member and a viscoelastic fluid, and the viscoelastic fluid fills at least part of the gap.

[0011] In one or more embodiments, the damping member is detachably provided on the mounting plate and / or the elastic body.

[0012] In one or more embodiments, one end of the elastomer is fixedly connected to the mounting plate, and the damping member is provided at the other end of the elastomer.

[0013] Another object of the present invention is to provide a weighing sensor assembly, including a mounting plate, a connecting member and an elastomer. One end of the elastomer is fixed to the mounting plate by means of the connecting member, and a gap is defined between the other end and the mounting plate. The assembly further includes the above-mentioned anti-impact structure.

[0014] The above anti-impact structure uses a damping member such as a viscoelastic material as a limiting component of the weighing sensor. The strain rate-related effect of the viscoelastic material shows a large complex modulus when impacted, which not only limits the displacement of the weighing sensor, but also accelerates the attenuation of the vibration caused by the impact, thereby ensuring the weighing performance and accuracy of the weighing sensor assembly and the weighing system, and improving the anti-impact ability of the weighing sensor assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and other features, properties and advantages of the present invention will become more apparent from the following description in conjunction with the drawings and embodiments, wherein:

[0016] Figure 1 is a schematic diagram of an embodiment of a weighing sensor assembly;

[0017] Figure 2 is a schematic diagram of an embodiment of a damping member;

[0018] Figure 3 is a schematic diagram of another embodiment of a damping member;

[0019] Figure 4 is a schematic diagram of still another embodiment of a damping member;

[0020] Figure 5 is a schematic diagram of yet another embodiment of a damping member;

[0021] Figure 6 is a schematic diagram of the vibration curve of a weighing sensor system. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present invention will be further described below in conjunction with specific embodiments and the drawings. More details are set forth in the following description in order to fully understand the present invention. However, the present invention can obviously be implemented in many other ways different from this description. Those skilled in the art can make similar generalizations and deductions according to the actual application situation without departing from the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0023] It should be noted that these and subsequent other drawings are only examples, and they are not drawn under the condition of equal proportion, and should not be used to limit the actual protection scope required by the present utility model.

[0024] Figure 1 The structure of the load cell is shown, including a mounting plate 10, a connecting member 20, and an elastic body 30. The mounting plate 10 is the bottom plate for installing the sensor, and the bottom plate can be flat, U-shaped, or other shapes. The elastic body 30, as the core component of the sensor, is provided with strain gauges on its surface. One end of the elastic body 30 is fixed to the mounting plate 10 by means of a connecting member 20 such as a bolt, and the other end defines a gap G with the mounting plate 10. The gap G allows the elastic body 30 to deform, thereby causing the strain gauges to generate strain.

[0025] When abnormal situations such as dropping or impact occur, the load cell will lose its weighing accuracy due to the action of impact loads. Therefore, an anti-impact structure is required to limit the displacement and amplitude of the elastic body of the load cell, and to avoid damage to the weighing system or unacceptable weighing errors caused by impact.

[0026] Refer to Figures 1 to 5 As shown, the anti-impact structure for the load cell includes a damping member 40 located in the gap G. The damping member 40 is preferably a viscoelastic material. When there is no impact load acting on the system, the viscoelastic material exhibits a relatively low complex modulus, which has little impact on the accuracy of the weighing system and does not affect the normal use of the load cell. When the system is subjected to an impact load, the rate-dependent effect of the viscoelastic material during impact exhibits a relatively large complex modulus, which not only limits the displacement of the load cell, but also accelerates the attenuation of the vibration caused by the impact, thereby ensuring the weighing performance and accuracy of the load cell and its weighing system, and further improving the anti-impact performance and reliability of the weighing system.

[0027] When the load cell is subjected to an impact, the elastic body will vibrate, and the introduction of the viscoelastic material limiting component will add additional damping to the vibration system. The displacement response of the vibration system is where ξ is the damping ratio, ω n is the undamped natural frequency, is the damped natural frequency, t is the time, and x is the displacement response quantity. As shown in the vibration curve of the load cell system in Figure 6 , the abscissa t is the time, and the ordinate x is the displacement response quantity.

[0028] From the above formula and the attached Figure 6It can be seen that the introduction of damping will cause the amplitude to decay rapidly, thereby reducing the impact on the vibration symmetrical weighing sensor and the weighing system. Moreover, the complex modulus of the viscoelastic material increases with the increase of frequency. The impact process can be regarded as a part of the vibration period. The faster the impact speed, the greater the complex modulus of the viscoelastic material, and the more the limiting effect can be reflected.

[0029] In some embodiments, the damping member 40 is a solid made of a viscoelastic material provided on the mounting plate 10 and / or the elastic body 30. For example, in Figure 2 the illustrated embodiment, a layer of damping member 40 made of a viscoelastic material is fixed on the mounting plate 10 and has a certain gap with the elastic body 30 in the natural unloaded state to allow the normal deformation of the elastic body. In Figure 3 the illustrated embodiment, a layer of damping member 40 made of a viscoelastic material is fixed on the elastic body 30 and has a certain gap with the mounting plate 10 in the natural unloaded state. In Figure 4 the illustrated embodiment, the damping member 40 can also be a multi-layer viscoelastic solid layer member, for example, formed by laminating at least two layers of viscoelastic materials 40, 40'.

[0030] The viscoelastic material for limiting is preferably a material with a higher modulus. In some embodiments, the quasi-static modulus range of the viscoelastic material is 0.8 - 1.2 Gpa. For example, various rubbers, polymer materials, etc. are used to prepare the damping member. When the damping member 40 is in a solid form, the maximum thickness of the damping member in the Figure 2 up and down direction is set such that when the weighing sensor is subjected to a load within 1.5 times the range, the damping member 40 fills at least part of the gap G, that is, when the weighing sensor is subjected to a load of 1.5 times the full scale, after the elastic body deforms, the elastic body 30 and the mounting plate 10 can simultaneously contact the viscoelastic material, so that the damping member 40 plays a limiting role.

[0031] The damping member 40 in the Figure 2 up and down direction of the above can be set to be consistent along the length direction of the elastic body, or can be set to be inconsistent. When the thickness is inconsistent, the thickness change of the damping member 40 is determined according to the deformation amount of each part of the elastic body.

[0032] The damping member 40 is detachably disposed on the mounting plate 10 or the elastomer 30 by means such as pasting, so that the thickness of the damping member 40 is adjustable, easy to replace, and has good environmental adaptability. For example, when the size of the gap G is not determined and debugging is required, the damping member can be pre-attached to the mounting plate 20 that has been fixed in the weighing device, and then different models of elastomers 30 can be adapted; in an installation environment where the size of the gap G is known, the damping member 40 can be pre-attached to the elastomer 30 of the sensor and directly adapted to the mounting plates 10 of different weighing devices. The above design enables the damping member to determine a suitable size according to the specific device model and installation conditions, so as to achieve a better limiting effect and avoid problems such as limiting failure or interference fit caused by mismatched sizes.

[0033] The damping member 40 is along Figure 2 The shape of the horizontal cross-section perpendicular to the paper plane in the middle includes but is not limited to being circular, square, rectangular or irregular, that is, the damping member 40 covers the elastomer 30 or the mounting plate 10 in a circular, square, rectangular or irregular shape. The damping member 40 is along Figure 2 The length in the left-right direction in the middle is less than the length of the gap G. Preferably, when one end of the elastomer is fixedly connected to the mounting plate, the damping member 40 is disposed on the other end of the elastomer that extends out, so as to achieve better limiting performance.

[0034] In some other embodiments, the damping member 40 is a viscoelastic fluid that fills at least part of the gap G. As Figure 5 shown, the damping member 40 can be a viscous and thick liquid in a viscous flow state, having the properties of a non-Newtonian fluid, and filling the gap G by means of capillary force, etc. Since the viscoelastic material limit has the properties of a non-Newtonian fluid, during quasi-static loading, its modulus and yield stress are both very low, even lower than 1 MPa, which has almost no influence on the weighing accuracy and does not affect the normal deformation of the elastomer; while during impact loading, its modulus increases sharply, so as to achieve a good anti-impact protection effect.

[0035] In still some other embodiments, the damping member 40 includes a viscoelastic solid layer member and a viscoelastic fluid. For example, a layer of viscoelastic solid is disposed on the mounting plate. In the state where the sensor is not loaded, the viscoelastic fluid fills at least part of the gap, such as filling the gap between the viscoelastic solid and the elastomer, and can further fill the gap between the mounting plate and the elastomer.

[0036] The above anti-impact structure uses a viscoelastic material to make the damping member of the weighing sensor for limiting, which can adapt to a variety of application scenarios, is easy to replace, increases the damping of the weighing system while limiting the amplitude of the components, so that the vibration decays quickly, thereby ensuring the weighing performance and accuracy of the weighing sensor or the weighing system during impact loading or dropping, and thus improving the reliability of the weighing system.

[0037] Combined with the introduction of the above anti-shock structure, a load cell can also be understood, which includes a mounting plate, a connecting piece, an elastic body and the above anti-shock structure. One end of the elastic body is fixed to the mounting plate by means of the connecting piece, and the other end defines a gap with the mounting plate, and the anti-shock structure is arranged in the gap. The load cell adds damping in the gap, effectively limiting the vibration amplitude of the system or its components caused by impact loading or dropping. Since the viscoelastic material shows a strain rate strengthening effect when being limited, it can significantly improve the anti-shock performance of the weighing system, thereby avoiding damage to the sensor and the connected components caused by excessive amplitude of the weighing system or its components and resulting in loss of weighing performance or weighing accuracy.

[0038] This application uses specific terms to describe the embodiments of this application. Such as "one embodiment", "an embodiment", and / or "some embodiments" mean a certain feature, structure or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that "an embodiment" or "one embodiment" or "an alternative embodiment" mentioned twice or more at different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures or characteristics in one or more embodiments of this application can be appropriately combined.

[0039] Although the present utility model is disclosed above with preferred embodiments, it is not used to limit the present utility model. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present utility model. Therefore, all modifications, equivalent changes and decorations made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model fall within the protection scope defined by the claims of the present utility model.

Claims

1. An impact-resistant structure for a weighing sensor assembly, wherein the weighing sensor assembly comprises a mounting plate and an elastic body, wherein a gap exists between at least a portion of the mounting plate and the elastic body, and wherein: The impact resistant structure includes a damping member located within the void.

2. The impact-resistant structure according to claim 1, characterized in that: The damping element is made of viscoelastic material.

3. The impact-resistant structure according to claim 2, characterized in that: The damping member is a solid body arranged on the mounting plate and / or the elastic body, and the maximum thickness of the damping member is set so that when the weighing sensor is subjected to a load of 1.5 times the measuring range, the damping member fills at least a part of the gap.

4. The impact-resistant structure according to claim 2, characterized in that: The quasi-static modulus of the viscoelastic material ranges from 0.8 to 1.2 GPa.

5. The impact-resistant structure according to claim 2, characterized in that: The damping element is a viscoelastic fluid filling at least a portion of the gap.

6. The impact-resistant structure according to claim 2, characterized in that: The damping element is one or more layers of viscoelastic solid layered elements.

7. The impact-resistant structure according to claim 2, characterized in that: The damping element includes a viscoelastic solid layer and a viscoelastic fluid, and the viscoelastic fluid fills at least a portion of the gap.

8. The impact-resistant structure according to claim 1, characterized in that: The damping member is detachably arranged on the mounting plate and / or the elastic body.

9. The impact-resistant structure according to claim 1, characterized in that: One end of the elastic body is fixedly connected to the mounting plate, and the other end of the elastic body is provided with the damping member.

10. A weighing sensor assembly, comprising a mounting plate, a connecting piece and an elastic body, wherein one end of the elastic body is fixed to the mounting plate by means of the connecting piece, and the other end defines a gap with the mounting plate, characterized in that: The assembly further comprises an impact-resistant structure as claimed in any one of claims 1 to 9.

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