CN214407830U

CN214407830U - Strain type force sensitive sensing device

Info

Publication number: CN214407830U
Application number: CN202022925169.1U
Authority: CN
Inventors: 王春国; 周争云
Original assignee: SHENZHEN LIHE XINYUAN INTELLIGENT TECHNOLOGY CO LTD
Current assignee: SHENZHEN LIHE XINYUAN INTELLIGENT TECHNOLOGY CO LTD
Priority date: 2020-12-09
Filing date: 2020-12-09
Publication date: 2021-10-15
Anticipated expiration: 2030-12-09

Abstract

The utility model provides a strain type force sensitive sensing device, include: the end plate is provided with a pressure head; the elastic gasket is arranged on the end plate and sleeved on the periphery of the pressure head; the gasket type sensor is arranged on the elastic gasket, a cantilever beam is arranged in the middle of the gasket type sensor, and a strain gauge is arranged on the cantilever beam; and a post disposed above the shim sensor. During the use, pressure is applyed on the stand, the utility model discloses after the sensing device pressure-bearing, the elastic washer warp, and the height of elastic washer is compressed. The salient point of the pressure head fixed on the end plate is contacted with the tail end of the cantilever beam of the gasket sensor. The pressure is reacted to the cantilever beam of the pad sensor, the strain gauge on the cantilever beam of the pad sensor deforms along with the pressure, and the signal generated by the strain gauge is output to the control module through the lead. The control module processes the signals and then calculates the pressure.

Description

Strain type force sensitive sensing device

Technical Field

The utility model relates to a gravity sensing device, more specifically relates to a quick sensing device of strain gauge formula force.

Background

A strain type force sensitive sensing device is a sensing device based on a strain type principle. The sensing device is based on a strain sensor for measuring the deformation of an object under force, and a strain gauge (or strain gauge) is the most commonly used sensing element, and is a sensing element capable of converting the change of strain on a mechanical component into the change of resistance. The strain type force-sensitive sensing device is mainly used for intelligent home, intelligent goods shelves, intelligent desks, intelligent sickbeds and the like (force measuring elements of various electronic scales and material testing machines, thrust tests of engines and monitoring of dam body bearing conditions). Strain-type force-sensitive sensing devices require high sensitivity and stability.

Heretofore, strain-type force-sensitive sensing devices on the market have been complicated in structure, large in size and high in cost.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present invention provides a novel strain type force sensitive sensing device.

In order to achieve the above object, the present invention provides a strain type force sensitive sensing device, including:

the end plate is provided with a pressure head;

the elastic gasket is arranged on the end plate and sleeved on the periphery of the pressure head;

the gasket type sensor is arranged on the elastic gasket, a cantilever beam is arranged in the middle of the gasket type sensor, and a strain gauge is arranged on the cantilever beam;

and the upright is arranged above the shim type sensor.

According to an aspect of the utility model, the pressure head install in the middle part of end plate. Preferably, support legs are mounted below the end plates.

According to an aspect of the utility model, the center of pressure head is equipped with the bump, the bump with the strainometer is located the same axis.

According to an aspect of the utility model, the pressure head bump and cantilever beam tail end contact. When the elastic gasket is not compressed, the pressure head salient point is in non-mechanical contact with the tail end of the cantilever beam, when the elastic gasket is compressed, the pressure head salient point is abutted against the tail end of the cantilever beam, and the tail end of the cantilever beam generates pressure on the pressure head salient point.

According to an aspect of the present invention, the elastic washer is made of rubber. The linear better macromolecular material of deformation after the pressure-bearing is selected to the elastic washer, the utility model discloses preferred rubber materials.

According to one aspect of the present invention, the annular space enclosed by the elastic washer can accommodate the cantilever beam moving up and down therebetween.

According to an aspect of the present invention, the shim sensor includes: the middle part of the elastic gasket is provided with a cantilever beam;

the strain gauge is arranged on the cantilever beam;

and the lead is connected with the strain gauge.

Preferably, the shim sensor further comprises a protective cover body disposed on the strain gauge for protecting the strain gauge.

According to an aspect of the present invention, the elastic pad is a circular sheet body.

According to the utility model discloses an aspect, the cantilever beam includes head end and tail end, the head end be used for with resilient gasket connects, the tail end with certain distance has between the resilient gasket, makes the tail end can be in the middle of the resilient gasket activity from top to bottom.

Preferably, the cantilever beam and the elastic gasket are integrally formed.

Further preferably, the elastic pad is provided with a hollow in the middle, and the elastic pad forms the cantilever beam at the tongue part surrounded by the hollow.

Further preferably, the elastic gasket is provided with a U-shaped hollow in the middle, and the cantilever beam is in a rectangular tongue piece shape.

Preferably, the strain gauge is provided at the trailing end of the cantilever beam.

According to an aspect of the utility model, the elastic gasket with the cantilever beam adopts 65Mn spring steel.

According to an aspect of the utility model, the protective cover body is the colloidal silica body.

According to an aspect of the utility model, the stand includes the tube-shape main part and is located tube-shape main part bottom and from the ring process of tube-shape main part internal extension, the ring process be used for with the gasket type sensor is fixed and the pressfitting is in on the gasket type sensor.

According to an aspect of the present invention, the ring protrusion is matched with the elastic washer, and the corresponding distribution is on the upper and lower sides of the shim sensor.

Preferably, the shape and area of the annular protrusion and the elastic washer are consistent with those of the gasket-type sensor.

According to an aspect of the present invention, the end plate, the pressure head, and the column are made of rigid materials.

According to an aspect of the utility model, strain gauge force sensing device still includes control module, control module passes through the wire with the strainometer is connected.

The technical effects of the utility model:

the utility model makes full use of the simple structure of the gasket and the washer, hollows out a cantilever beam on the gasket, pastes the strain gauge on the cantilever beam, and makes the gasket into the sensor without increasing the structure height; the polymer washer is set as an auxiliary elastic element, and the stress is converted into the deformation of the strain gauge by matching with the cantilever beam, so that the increase of the height and the volume is not generated. The design realizes the stress measurement without changing the appearance of the tested product and increasing the height and the volume, and has simple structure, low cost and good stability.

Drawings

FIG. 1 is an exploded view of the strain gauge type force sensor of the present invention;

FIG. 2 is a schematic view of a partially sectioned construction of the column;

fig. 3 is a schematic perspective view of an embodiment of a shim sensor according to the present invention;

fig. 4 is a schematic top view of an embodiment of a shim sensor according to the present invention;

fig. 5 is a schematic top view of another embodiment of a shim sensor according to the present invention.

Detailed Description

In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.

Various embodiments according to the present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 shows a schematic structural decomposition diagram of a strain-type force-sensitive sensing device, which can be used in smart homes, smart offices, smart beds, smart shelves, and the like. The bending type force sensitive sensing device is formed by combining an upright post 5, a gasket type sensor 1, an elastic washer 2, a pressure head 4 and an end plate 3 from top to bottom, and all the components are fastened by bolts.

The structure of each component is described in detail below.

Fig. 2 shows a schematic view of a partially sectioned construction of a column. The column 5 includes a cylindrical body 51, and an annular protrusion 52 located at the bottom of the cylindrical body 51 and extending from the cylindrical body inward. The annular projection 52 of the upright 5 is used for fixing with the shim sensor 1 and pressing on the shim sensor 1.

Fig. 3 to 5 show a schematic illustration of the construction of shim sensor 1. Fig. 3 is a schematic perspective view of an embodiment of a shim sensor, and fig. 4 is a schematic top view of an embodiment of a shim sensor. Shim sensor 1, as shown in fig. 3 and 4, comprises: elastomeric pad 11, strain gauge 12 and wire 13. The middle part of the elastic gasket is provided with a cantilever beam 14, and the cantilever beam 14 belongs to one part of the elastic gasket and is integrally formed with the elastic gasket. Material is removed from the middle of the resilient pad to form a shaped cutout 15, so that the resilient pad 11 forms a cantilever beam at the tab portion 14 around which the cutout is located. The cantilever beam 14 includes a head end 141 and a tail end 142, the head end 141 is connected to the elastic pad, and the tail end 142 is spaced from the elastic pad such that the tail end 142 can move up and down in the middle of the elastic pad 11. The distance between the tail end 142 and the elastic pad 11 can be adjusted according to the size of the applied device, the size of the elastic pad and the size of the strain gauge, which can be realized by those skilled in the art according to the description of the present invention and in combination with the prior art. The strain gage 12 is mounted to the trailing end 141 of the cantilever beam 14. Wires 13 are connected to strain gauges 12. The strain gauge 12 may be adhered to the surface of the elastic pad 11, and the lead wire 13 may be welded to the strain gauge 12. A protective cover 16 is also provided on the strain gauge 12 to protect the strain gauge 12. Strain gage 12 is not shown in fig. 3, and strain gage 12 is enclosed in protective cover 16. Fig. 4 shows the protective cover 16 partially in section. The protective cover 16 may be silicone, and encloses the strain gauges and/or the connections of the strain gauges to the leads on the cantilever beam 14. Preferably, the elastic pad 11 is a circular sheet. In this embodiment, the resilient pad 11 has a U-shaped hollow 15 in the middle, and the cantilever beam 14 has a rectangular tongue shape. When the cantilever beam 14 in the middle 1 of the elastic pad 11 is stressed, it will deform, and thus the strain gauge 12 will be driven to deform, the strain gauge 12 will output an electrical signal to the external control module 6 through the lead 3, and the stress can be further calculated by the control module. Fig. 5 is a schematic top view of another embodiment of a shim sensor, with fig. 5 showing boot 16 in partial cross-section. A different shape of the cantilever beam 4 is shown. This embodiment is more suitable for the case where the strain gauge is wide. In addition to this, the cantilever beam can also be made in other shapes.

As shown in fig. 1, the indenter 4 is fixed to the end plate 3, and the convex point 40 of the indenter 4 is located at the geometric center of the end plate. In this embodiment, both ends of the ram 4 are fixed to the end plate 3 by bolts (nuts) 9. Other means of securing the ram 4 and end plate 3 may be used by those skilled in the art. The elastic washer 2 can be made of a high polymer material with good deformation linearity after pressure bearing, and the embodiment adopts rubber. The elastic washer 2 is in contact with the indenter bump 40. When the spring washer 2 is not compressed, the indenter bump 40 is in mechanical contact with the cantilever beam tail end 142, i.e., only contact, but there is no interaction between the two. When the spring washer 2 is compressed, the indenter bump abuts the cantilever beam tail end, and the cantilever beam tail end 142 exerts pressure on the indenter bump 40. The annular space 20 enclosed by the elastic washer 2 accommodates the cantilever beam 14 to move up and down therebetween. The elastic washer 2 is fixed to the end plate 3 and the ram 4 is located in the inner space 20 enclosed by the elastic washer 2.

In a preferred embodiment, the column 5, the shim sensor 1, the elastic washer 2 and the end plate 3 are all provided with screw holes 8, the screw holes 8 of the four components have corresponding axial positions, and the screw holes 8 in the same axial direction of the four components are fixed by a nut, which is beneficial to the stability of the device.

During the use, pressure is applyed on stand 5, the utility model discloses after the sensing device pressure-bearing, the elastic washer warp, and the height of elastic washer is compressed. The raised point 40 of the ram 4 fixed to the end plate 3 contacts the tail end 142 of the cantilever beam 14 of the pad sensor 1. The pressure is reacted to the pad sensor 1 cantilever 14, the strain gauge 12 on the pad sensor cantilever 14 deforms accordingly, and the strain gauge 12 generates a signal which is output to the control module 6 through the lead 13. The control module 6 processes the signals and calculates the pressure.

While the foregoing disclosure shows illustrative embodiments of the invention, it should be noted that various changes and modifications could be made herein without departing from the scope of the invention as defined by the appended claims. Furthermore, although elements of the invention may be described or claimed in the singular, the plural is contemplated unless limitation to a single element is explicitly stated.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A strain-type force sensitive transducer apparatus, comprising:

the end plate is provided with a pressure head;

the gasket type sensor is arranged on the elastic gasket, a cantilever beam is arranged in the middle of the gasket type sensor, and a strain gauge is arranged on the cantilever beam; and

and the upright is arranged above the shim type sensor.

2. The strain-type force sensitive transducer of claim 1, wherein the indenter is mounted in a middle portion of the end plate.

3. The strain-type force sensitive transducer of claim 2, wherein support legs are mounted below the end plate.

4. The strain-type force sensitive transducer apparatus according to claim 1, wherein the indenter has a bump in the center thereof, the bump being located on the same axis as the strain gauge.

5. The strain-type force sensitive transducer of claim 1, wherein the indenter bump contacts the cantilever beam tail end.

6. The strain-type force sensitive sensing device of claim 1, wherein the resilient gasket is made of a rubber material.

7. The strain-type force sensitive transducer assembly of claim 6, wherein the annular space defined by the resilient washer accommodates up and down movement of the cantilevered beam therebetween.

8. The strain-type force sensitive sensing device of claim 1, wherein the shim-type sensor comprises: the middle part of the elastic gasket is provided with a cantilever beam;

the strain gauge is arranged on the cantilever beam;

and the lead is connected with the strain gauge.

9. The strain-type force sensitive sensing device of claim 1, wherein the shim sensor further comprises a protective cover disposed over the strain gage for protecting the strain gage.

10. The strain-type force sensitive transducer apparatus according to claim 8, wherein the resilient spacer is a circular sheet.

11. The strain-type force sensitive transducer apparatus according to claim 8, wherein the cantilevered beam includes a head end and a tail end, the head end being adapted to be coupled to the resilient pad, the tail end being spaced from the resilient pad such that the tail end is movable up and down between the resilient pad.

12. The strain-type force sensitive sensing device of claim 8, wherein the cantilevered beam is integrally formed with the resilient pad.

13. The strain-type force sensing device according to claim 8, wherein the resilient pad is hollowed out in the middle thereof, and the resilient pad forms the cantilever beam at a tongue portion surrounded by the hollowed out.

14. The strain-type force sensing device according to claim 13, wherein the resilient pad has a U-shaped cutout in the middle thereof, and the cantilever beam has a rectangular tab shape.

15. The strain-type force sensitive sensing device of claim 11, wherein the strain gauge is disposed at a trailing end of the cantilever beam.

16. The strain-type force sensitive sensing device of claim 9, wherein the resilient pad and the cantilevered beam are 65Mn spring steel; the protective cover body is a silica gel body.

17. The strain-type force-sensitive transducer assembly according to claim 1, wherein the post comprises a cylindrical body and a collar located at a bottom of the cylindrical body and extending inwardly from the cylindrical body, the collar adapted to be secured to and press-fit over the shim-type sensor.

18. The strain-type force-sensitive transducer assembly according to claim 17, wherein the annular protrusions are adapted to the elastic washer and are correspondingly disposed on the upper and lower sides of the shim-type sensor.

19. The strain-type force sensitive sensing device of claim 18, wherein the annular protrusion and the resilient washer conform to the shape and area of contact with the shim-type sensor.

20. The strain-type force sensitive transducer apparatus of claim 1, wherein the end plates, indenter, and post are made of rigid materials.

21. The strain-type force sensitive sensing device of claim 1, further comprising a control module connected to the strain gage by a wire.