CN219347919U

CN219347919U - Resistance strain type digital weighing sensor

Info

Publication number: CN219347919U
Application number: CN202320113052.4U
Authority: CN
Inventors: 徐杰; 陈华南; 赵金龙
Original assignee: Wuxi Kezhu Automation Technology Co ltd
Current assignee: Wuxi Kezhu Automation Technology Co ltd
Priority date: 2023-01-16
Filing date: 2023-01-16
Publication date: 2023-07-14
Anticipated expiration: 2033-01-16

Abstract

The utility model discloses a resistance strain type digital weighing sensor, which comprises an elastomer, wherein a strain gauge is arranged in the elastomer, a sensor outgoing terminal is arranged at one end of the side surface of the elastomer in the length direction, a through hole is formed in the middle of the elastomer, and the strain gauge is arranged in the through hole; the sensor pressure head is matched with the elastic body, and a blind hole matched with the top end of the sensor overload protection jackscrew is formed in one surface of the sensor pressure head facing the sensor overload protection jackscrew. The structural improvement of the utility model can enhance the structural strength and avoid damage during use.

Description

Resistance strain type digital weighing sensor

Technical Field

The utility model relates to a resistance strain type digital weighing sensor.

Background

A resistive strain gauge sensor (strain gauge) is a resistive sensor having a resistive strain gauge as a conversion element. The resistance strain type sensor consists of an elastic sensitive element, a resistance strain gauge, a compensation resistance and a shell, and can be designed into various structural forms according to specific measurement requirements. The elastic sensing element is deformed by the measured force and causes the resistive strain gauge attached thereto to deform together. The resistance strain gauge converts the deformation into a change of a resistance value, so that various physical quantities such as force, pressure, torque, displacement, acceleration, temperature and the like can be measured. In the prior art, there are many related principles and related improvements, such as Wang Qi published in "Wood processing machine" in the 3 rd phase of 05 and "design of resistance strain type weighing sensor", which adopts a double-hole beam as an elastic element, and can weigh the weight of the wood to be tested at a certain moment to calculate the moisture content of the wood to be tested at that moment. The prior art is focused on the improvement of the structure and the improvement on the processing to meet the application requirement of the resistance strain type weighing sensor or reduce the manufacturing and processing cost, and the structure of the resistance strain type weighing sensor is improved to strengthen the structural strength or avoid damage in use, and the patent with the publication number of CN 210570951U: the utility model provides a resistance strain type weighing sensor of wide range bearing detection, has solved the problem that the detection scope of resistance strain type weighing sensor of present stage increases to 800mm back and takes place the bending fracture easily when carrying out the weighing detection. The technical scheme is that the resistance strain type weighing sensor for wide-range bearing detection comprises an elastomer and a mounting seat arranged on the side wall of the elastomer, wherein the elastomer is provided with a strain gap and four blind holes, and the elastomer is divided into a basic part and a reinforced part from top to bottom according to the plane of the bottom surface of the mounting seat; the strain gap comprises two first gap parts positioned at two ends, a second gap part positioned at the middle part and a transition gap part connecting the first gap part and the second gap part; the first gap part is positioned at the base part and is positioned below the blind hole; the second gap part is positioned in the strengthening part. The reinforcing part is arranged below the base part, so that the second gap part in the strain gap can be arranged in the reinforcing part, the thickness of the part from the second gap part to the top surface of the elastic body in the elastic body is increased, the bending resistance of the part is improved, and the resistance strain type weighing sensor is not easy to break when bearing the weight of the rail transport vehicle. The structure strength is improved to a certain extent, but when the weighing sensor is overloaded, the sensor overload protection jackscrew is touched, the problem that the sensor pressure head or the elastic body is damaged still exists, and in addition, the structure strength of the existing resistance strain type digital weighing sensor is poor, and the existing resistance strain type digital weighing sensor is easy to damage during use.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art and provide a resistance strain type digital weighing sensor, the structural strength of which can be enhanced by structural improvement, and damage during use can be avoided.

In order to achieve the above purpose, the technical scheme of the utility model is to design a resistance strain type digital weighing sensor, which comprises an elastomer, wherein a strain gauge is arranged in the elastomer, a sensor outgoing terminal is arranged at one end of the side surface of the elastomer in the length direction, a through hole is arranged in the middle of the elastomer, and the strain gauge is arranged in the through hole;

the sensor pressure head is matched with the elastic body, and a blind hole matched with the top end of the sensor overload protection jackscrew is formed in one surface of the sensor pressure head facing the sensor overload protection jackscrew. Although the sensor overload protection jackscrew is arranged in a matched manner with the sensor pressure head to realize overload protection, the problem that the sensor pressure head is damaged or an elastic body is damaged during overload still exists, so that a blind hole matched with the top end of the sensor overload protection jackscrew is arranged on one surface of the sensor pressure head facing the sensor overload protection jackscrew, the contact between the sensor pressure head and the sensor overload protection jackscrew is more accurate during overload, the tiny slippage of the top end of the jackscrew and the plane contact of the bottom surface of the sensor pressure head is avoided, the overload protection function is better realized, and the damage is avoided (the distance between the jackscrew and the sensor pressure head is redesigned according to the depth and the size of the blind hole of course).

The further technical proposal is that the depth of the blind hole is 1-3 mm, and the orifice of the blind hole is fixedly provided with a plastic film covering the orifice. After the setting, the contact between the sensor pressure head and the sensor overload protection jackscrew is softer when overload occurs, and the probability of damage to the sensor pressure head or the elastic body is reduced.

The further technical scheme is that a pressure sensor is arranged in the blind hole, a controller is electrically connected with the pressure sensor, and the controller is electrically connected with the buzzer. The controller and the buzzer are not components in the resistance strain type digital weighing sensor, but are arranged in a matched mode with the resistance strain type digital weighing sensor, and the controller and the buzzer are kept at a certain distance from the working range of the resistance strain type digital weighing sensor. The sensor overload protection jackscrew is used for bursting the plastic film and then is contacted with the pressure sensor, the pressure sensor sends a signal to the controller after detecting the pressure, and the controller controls the buzzer to alarm so as to prompt overload of the resistance strain type digital weighing sensor.

The further technical scheme is that a buffer piece made of rubber materials is fixedly arranged in the blind hole, and a pressure sensor is fixedly connected to the top end of the sensor overload protection jackscrew facing the buffer piece; the lower end of the buffer piece is not arranged beyond the orifice of the blind hole. The pressure sensor is electrically connected with a controller, and the controller is electrically connected with the buzzer. The buffer piece is arranged in the blind hole, so that the contact between the sensor pressure head and the sensor overload protection jackscrew is softer during overload, the probability of damage of the sensor pressure head or the elastic body is reduced, and the arrangement of the sensor at the top end of the sensor overload protection jackscrew can give an alarm after sending information during overload; the buffer member can also be arranged in a form of filling the blind hole, namely, the lower end of the buffer member is just flush with the orifice of the blind hole, so that the distance between the overload protection jackscrew of the sensor and the pressure head of the sensor does not need to be redesigned.

Further technical scheme is, fixedly connected with warp beam on the hole inner wall of through-hole, the middle part fixedly connected with ladder ring of warp beam, the both ends mouth seal setting of ladder ring, the foil gage sets up in the both ends mouth of ladder ring. The ladder ring is three ladder rings and middle part ring is the small-size end, and both ends part is jumbo size ring end, and the three ladder ring forms of setting like this because middle rigidity is little, and both ends rigidity is big, so the sealed not fragile of both ports of ladder ring when detecting.

The utility model has the advantages and beneficial effects that: the structural improvement can enhance the structural strength and avoid damage during use.

Although the sensor overload protection jackscrew is arranged in a matched manner with the sensor pressure head to realize overload protection, the problem that the sensor pressure head is damaged or an elastic body is damaged during overload still exists, so that a blind hole matched with the top end of the sensor overload protection jackscrew is arranged on one surface of the sensor pressure head facing the sensor overload protection jackscrew, so that the contact between the sensor pressure head and the sensor overload protection jackscrew is more accurate during overload, the top end of the jackscrew is prevented from tiny sliding in plane contact with the bottom surface of the sensor pressure head, the overload protection function is better realized, and the damage is avoided

And when in overload, the contact between the sensor pressure head and the sensor overload protection jackscrew is softer, so that the probability of damage to the sensor pressure head or the elastomer is reduced.

The buffer piece is arranged in the blind hole, so that the contact between the sensor pressure head and the sensor overload protection jackscrew is softer during overload, the probability of damage of the sensor pressure head or the elastic body is reduced, and the arrangement of the sensor at the top end of the sensor overload protection jackscrew can give an alarm after sending information during overload;

the ladder ring is three ladder rings and middle part ring is the small-size end, and both ends part is jumbo size ring end, and the three ladder ring forms of setting like this because middle rigidity is little, and both ends rigidity is big, so the sealed not fragile of both ports of ladder ring when detecting.

Drawings

FIG. 1 is a schematic diagram of a resistance strain digital weighing cell of the present utility model;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a schematic view in the A-A direction of FIG. 2;

FIG. 4 is an enlarged schematic view of the deformed beam and stepped annular ring portion of FIG. 3;

fig. 5 is an enlarged schematic view of the sensor ram and sensor overload protection jack portion of fig. 2.

In the figure: 1. an elastomer; 2. a sensor outlet terminal; 3. a through hole; 4. a sensor ram; 5. overload protection jackscrew of sensor; 6. a blind hole; 7. a buffer member; 8. a pressure sensor; 9. a deformed beam; 10. a stepped annular ring; 11. and (5) installing screw holes.

Detailed Description

The following describes the embodiments of the present utility model further with reference to the drawings and examples. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and are not intended to limit the scope of the present utility model.

As shown in fig. 1 to 5 (for convenience of illustration, fig. 1 does not show a deformed beam, a stepped ring, a sensor pressure head and a sensor overload protection jackscrew; fig. 2 does not show a buffer member; fig. 4, the curved part represents the seal of the end part of the stepped ring), the utility model relates to a resistance strain type digital weighing sensor, which comprises an elastomer 1, wherein a strain gauge is arranged in the elastomer 1, one end of the side surface of the elastomer 1 in the length direction is provided with a sensor outlet terminal 2, the middle part of the elastomer 1 is provided with a through hole 3, and the strain gauge is arranged in the through hole 3; the sensor pressure head 4 is matched with the elastic body 1, and a blind hole 6 matched with the top end of the sensor overload protection jackscrew 5 (the sensor overload protection jackscrew is arranged on a sensor mounting support) is formed in one surface of the sensor pressure head 4 facing the sensor overload protection jackscrew 5. The depth of the blind hole 6 is 1-3 mm, a buffer piece 7 made of rubber material is fixedly arranged in the blind hole 6, and the top end of the sensor overload protection jackscrew 5 facing the buffer piece 7 is fixedly connected with a pressure sensor 8; the lower end of the buffer 7 is not arranged beyond the orifice of the blind hole 6. The deformation beam 9 is fixedly connected to the inner wall of the through hole 3, the stepped circular ring 10 is fixedly connected to the middle of the deformation beam 9, two ports of the stepped circular ring 10 are sealed, and the strain gauge is arranged in the two ports of the stepped circular ring 10. The elastic body is provided with a sensor mounting screw hole 11 in a penetrating manner, and the mounting screw hole 11 is arranged along the height direction of the elastic body.

The working principle is as follows:

when overload occurs, the top end of the sensor overload protection jackscrew contacts with the buffer in the blind hole, the pressure sensor on the sensor overload protection jackscrew detects pressure and then sends a signal to the controller, and the controller controls the buzzer to alarm so as to prompt overload of the resistance strain type digital weighing sensor.

When the resistance strain type digital weighing sensor is loaded with force, the deformation beam 9 deforms firstly, the middle part of the deformed ladder circular ring of the deformation beam 9 deforms, and finally sealing elements at two ends and two ports of the ladder circular ring are driven to deform. Because the middle of the ladder ring has small rigidity and the two ends have large rigidity, the sealing of the two ports of the ladder ring is not easy to damage when the ladder ring is detected (the middle part is deformed greatly but the two ends are deformed slightly).

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principle of the present utility model, and these modifications and variations should also be regarded as the scope of the utility model.

Claims

1. The resistance strain type digital weighing sensor is characterized by comprising an elastomer, wherein a strain gauge is arranged in the elastomer, a sensor outgoing terminal is arranged at one end of the side surface of the elastomer in the length direction, a through hole is formed in the middle of the elastomer, and the strain gauge is arranged in the through hole;

the sensor pressure head is matched with the elastic body, and a blind hole matched with the top end of the sensor overload protection jackscrew is formed in one surface of the sensor pressure head facing the sensor overload protection jackscrew.

2. The resistance strain type digital weighing sensor according to claim 1, wherein the depth of the blind hole is 1-3 mm, and a plastic film covering the hole is fixedly arranged at the hole opening of the blind hole.

3. The resistance strain type digital weighing sensor according to claim 2, wherein a pressure sensor is arranged in the blind hole, a controller is electrically connected with the pressure sensor, and the controller is electrically connected with the buzzer.

4. The resistance strain type digital weighing sensor according to claim 1, wherein a buffer piece made of rubber material is fixedly arranged in the blind hole, and a pressure sensor is fixedly connected to the top end of the overload protection jackscrew facing the buffer piece; the lower end of the buffer piece is not arranged beyond the orifice of the blind hole.

5. The resistance strain type digital weighing sensor according to claim 1, 3 or 4, wherein a deformation beam is fixedly connected to the inner wall of the through hole, a stepped circular ring is fixedly connected to the middle of the deformation beam, two ports of the stepped circular ring are sealed, and strain gauges are arranged in two ports of the stepped circular ring.