WO2014190932A1

WO2014190932A1 - Elastomer structure of multi-range weighing sensor

Info

Publication number: WO2014190932A1
Application number: PCT/CN2014/078871
Authority: WO
Inventors: 郝德刚; 王伟; 徐宇军
Original assignee: 梅特勒-托利多(常州)精密仪器有限公司; 梅特勒-托利多(常州)测量技术有限公司; 梅特勒-托利多(常州)称重设备系统有限公司
Priority date: 2013-05-31
Filing date: 2014-05-30
Publication date: 2014-12-04
Also published as: CN103335699B; CN103335699A

Abstract

An elastomer structure of a multi-range weighing sensor comprises a fixed part and a strain part. The strain part comprises at least two sensitive strain areas of different ranges arranged on an elastomer (2). The first sensitive strain area is provided with a first strain hole (6), and a first strain gage group (5) for measuring a first range load is fixed on the thin wall of the first strain hole (6). The second sensitive strain area is provided with a second strain hole (12), and a second strain gage group (11) for measuring a second range load is fixed on the thin wall of the second strain hole (12). A first notch (15) having a first overload gap α is arranged on a first overload beam (14) inside the second strain hole (12) or on the corresponding elastomer (2). The elastomer structure is reasonable, can achieve the measurement for both wide-range loads and small-range loads on the elastomer (2) and can be processed according to conventional manufacturing technologies, and moreover, the processing precision can be ensured without precision improvement.

Description

Elastomer structure of multi-range load cell

Field of invention

The invention relates to an elastomer structure of a multi-range load cell, belonging to the field of load cell technology. Background technique

In the weighing process, it is hoped that the same scale can weigh both very light objects and heavy objects, but the output range signal of a load cell is within the set range, if the rated load is large. Heavy-duty sensors, when measuring objects of lower quality, there will be a large measurement error; if a load cell with a small rated load is used, the load cell may be damaged due to overload when weighing a large load.

In order to reduce the structural design of the scale, a load cell with a large range of load and minimum proof scale values is required. The current solution has two structures. One type of structure is a high-load, high Y-worthy load cell. This type of load cell imposes high demands on manufacturing, and the minimum verification scale value is also difficult to control. Another solution is to use a load cell with a large load and a load cell with a small range load to connect the load cell with a small range load to measure the small load range, large load. The load cell measures the large load range, and the output of the load cell is selected by an external circuit, but the scale of this structure cannot measure the multi-range load. Summary of invention

The object of the present invention is to provide an elastomer structure of a multi-range load cell, which has a reasonable structure and is easy to manufacture, and can realize a large-range load measurement on an elastic body and a small-range load measurement.

The technical solution of the present invention to achieve the above object is: an elastomer structure of a multi-range load cell comprising a fixed portion and a strained portion, the fixed portion comprising a printed board mounting hole (3) on the elastic body (2), The strained portion comprises a sensitive strain zone disposed on the elastomer (2) with at least two different range loads, the first sensitive strain zone having a first strain hole (6), and the first strain hole (6) being located at a thin wall A first set of strain gauges (5) for measuring the first range load is fixed, a second strained strain zone has a second strain hole (12), and a second strain hole (12) is fixed at the thin wall for measuring the second a second set of strain gauges (11) of the range load, wherein the first notch (15) having the first overload gap α is disposed inside the second strain hole (12) or the second strain hole (12) and is second Between the strain holes corresponding to the next range load with a large range load.

The invention provides at least two sensitive strain zones of different range loads in the strain portion of the elastic body, so that the measured load deforms the sensitive strain regions of the respective range loads, and the first sensitive strain zone is perceived by the first set of strain gauges The strain generated by the deformation enables the first sensitive strain zone to achieve a large-scale load metering, and the second sensitive strain zone senses the strain generated by the deformation of the second set of strain gauges, in particular, the first sensitive strain zone is provided with the first overload The first notch of the gap α, so the second sensitive strain zone can achieve the measurement of the small-range load. And when the measured load is small, the metering is performed by the second sensitive strain zone, and when the load increases and exceeds the bearing capacity of the second sensitive strain zone, the first overload gap of the first notch of the second sensitive strain zone is eliminated, so that The load can be transmitted, and the load is loaded into the first sensitive strain zone through the first overload beam or the elastic body of the second sensitive strain zone, and the load is measured by the first sensitive strain zone, so that it can be passed through an elastic body Achieve large-scale load measurement and small-scale load measurement for easy control. The present invention is provided with a plurality of sensitive strain zones on an elastomer, which can be processed according to conventional manufacturing techniques without requiring an increase in precision to ensure machining accuracy.

The foregoing description of the preferred embodiments of the present invention Brief description of the drawing

The embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The accompanying drawings are included to provide a further understanding of the embodiments of the invention In the figure:

1 is a schematic structural view of an elastomer structure of a multi-range load cell of the present invention.

Fig. 2 is a cross-sectional view showing the structure of an elastomer of a multi-range load cell according to a first embodiment of the present invention.

Fig. 3 is a cross-sectional view showing the structure of an elastomer of a multi-range load cell according to a second embodiment of the present invention.

4 is a cross-sectional view showing an elastomer structure of a multi-range load cell according to a third embodiment of the present invention; Figure 5 is a cross-sectional view showing an elastomer structure of a multi-range load cell according to a fourth embodiment of the present invention.

Among them: 1 cable connector, 2 - elastomer, 3 - printed board mounting hole, 4 printed board, 5 - first set of strain gauges, 6 - first strain hole, 7 - third set of strain gauges, 8 - third strain hole, 9 second notch, 10 intermediate overload beam, 11 a second set of strain gauges, 12 second strain holes, 13 - load component mounting holes, 14 first overload beam, 15 - first notch , 16—threaded hole, 17 second deformed hole, 18—first deformed hole. 19 a threaded hole. Detailed description of the invention

Embodiments of the present invention will now be described in detail with reference to the drawings.

1 is a schematic structural view of an elastomer structure of a multi-range load cell of the present invention. Fig. 2 is a cross-sectional view showing the structure of an elastomer of a multi-range load cell according to a first embodiment of the present invention. As shown in Figures 1-2, the elastomeric structure of the multi-range load cell of the present invention includes a fixed portion and a strained portion. The fixed portion includes a printed board mounting hole 3 on the elastic body 2, and the printed board 4 is disposed on the printed board. In the board mounting hole 3, the printed board 4 is connected to the cable joint 1, and the electrical signal is output through the cable joint 1, the fixed portion also has a threaded hole 16, and the elastic body 2 is fixed on the base by the fastener, the strain portion The end portion has a loading member mounting hole 13, and the support member of the loading member or the loading member is mounted on the loading member mounting hole 13, and the object to be tested is loaded with a load on the elastic member by loading the member.

As shown in FIG. 2, the strained portion of the elastic body 2 of the present invention comprises a sensitive strain region disposed on the elastic body 2 with at least two different ranges of loads, and the first sensitive strain region of the present invention has a first strained hole 6, first The strain hole 6 is fixed at the thin wall with a first set of strain gauges 5 for measuring the first range load, the first set of strain gauges 5 may be conventional four strain gauges and form a bridge, and the first set of strain gauges 5 pass the wires Connected to the printed board 4, the measurement of the bulk load is performed by the first sensitive strain zone. The wire is threaded through the threading hole 19 shown in FIG. As shown in FIG. 2, the second sensitive strain zone of the present invention has a second strain hole 12, and the second strain hole 12 is fixed at the thin wall with a second set of strain gauges 11 for measuring the second range load, and the second set of strains. The sheet 11 may be a conventional four strain gauges and form a bridge. The second set of strain gauges 11 are connected to the printed board 4 by wires, and the intermediate overload beam 10 or the corresponding elastic body 2 in the second strain hole 12 is provided. The first notch 15 having the first overload gap α allows the second sensitive strain zone to be measured for small range loads. The wire is threaded through the threading hole 19 shown in FIG. Fixed to the elastomer 2 to The three lower seals respectively seal the first strain hole 6 and the second strain hole 12 and the printed board mounting hole 3, so that the elastic body 2 has better sealing performance.

As shown in FIG. 2, the strain portion of the elastic body 2 of the present invention further has a third sensitive strain region between the first sensitive strain region and the second sensitive strain region, and the third sensitive strain region has a third strain hole 8, The third strain hole 8 is fixed at the thin wall with a third set of strain gauges 7 for measuring the third range load, and the third set of strain gauges 7 can be a conventional four strain gauges and form a bridge, and the third set of strain gauges 7 pass The wires are connected to the printed board 4, and the seals fixed to the elastic body 2 respectively seal the third strain holes 8. The intermediate overload beam 10 or the corresponding elastic body 2 in the third strain hole 8 of the present invention is provided with a second notch 9 having a second overload gap β, and the bearing capacity of the third sensitive strain zone of the present invention is greater than the second sensitive strain. The carrying capacity of the area. As shown in Fig. 2, the second sensitive strain zone, the third sensitive strain zone and the first sensitive strain zone are horizontally arranged from right to left. However, it is also conceivable by those skilled in the art that the second sensitive strain zone, the third sensitive strain zone and the first sensitive strain zone can also be horizontally arranged from left to right. The invention may further have a third sensitive strain zone and a fourth sensitive strain zone between the first sensitive strain zone and the second sensitive strain zone, and the structure of the fourth sensitive strain zone is the same as the structure of the third sensitive strain zone, The bearing capacity increases from the second sensitive strain zone, the third sensitive strain zone, the fourth sensitive strain zone to the first sensitive strain zone, and can be set according to requirements. Similarly, the sensitive areas may be sequentially arranged in order according to the corresponding bearing capacity.

2 and 3, the thin wall thickness at the first strain hole 6 of the first sensitive strain zone of the present invention is greater than or equal to the thin wall thickness at the second strain hole 12 of the second sensitive strain zone, the third sensitive strain The thin wall thickness at the third strain hole 8 in the region is greater than the thin wall thickness at the second strain hole in the second sensitive strain region, so that the elastomer 2 has different deflections in different sensitive strain regions. As shown in FIG. 2, the thin wall at the strain hole of each sensitive strain zone of the present invention is corresponding to the concave curved structure of each strain hole and the outer wall of the elastic body 2, and can also be as shown in FIG. 3, the second of the present invention. The thin wall at the second strain hole of the sensitive strain zone and the thin wall at the third strain hole 8 of the third sensitive strain zone are formed by the strain holes and the deformation holes, and the first strain hole of the first sensitive strain zone The wall thickness at 6 is the thickness between the two ends of the strain hole and the outer wall of the elastic body 2.

As shown in FIG. 2, the first slot 15 of the first overload beam 14 of the second sensitive strain zone of the present invention has two ends communicating with the second strain hole, and the first slot 15 is an oblique vertical slot or port. a notch or a square wave notch or an L-shaped notch or a V-shaped notch, the first overload gap α of the first notch 15 being between 0.05 and 1.00 mm, the first overload gap α being 0.1 mm, 0.25 mm Or 0.5 mm or 0.8 mm, etc. As shown in FIG. 2, the second notch 9 on the intermediate overload beam 10 of the third sensitive strain zone of the present invention communicates with the third strain hole 8 at both ends thereof.

As shown in Fig. 2, when the object to be tested is loaded on the elastic body 2, the corresponding strain gauges in the respective sensitive strain zones sense the strain generated by the deformation. When the measured object is in the second range load measurement area, the second set of strain gauges 11 in the second sensitive strain zone senses the deformation of the sensitive strain zone, and the second range load can be measured to realize the measurement of the small range load; When the load continues to increase, the first overload gap on the first notch 15 in the second range load measurement area is eliminated, so that the second sensitive strain zone acts as a load transfer, and the circuit on the printed board 4 stops outputting. The bridge output signal formed by the two sets of strain gauges 11; at this time, the third set of strain gauges 7 of the third sensitive strain zone senses the deformation, and the output of the third set of strain gauges 7 constitutes the signal of the bridge output, and the load continues to increase. And when the third range load upper limit is reached, the second overload gap on the second slot 9 in the third range load measurement area is eliminated, and the third sensitive strain area acts as a load transfer, and the circuit on the printed board 4 Stopping outputting the bridge output signal formed by the third group of strain gauges 7, and outputting the bridge output signal formed by the first group of strain gauges 5 of the first sensitive strain zone, performing a large-range load Amount, a plurality of ranges to achieve a load on the elastomer metering.

Fig. 3 is a cross-sectional view showing the structure of an elastomer of a multi-range load cell according to a second embodiment of the present invention. The elastomer structure shown in Fig. 3 is similar to the elastomer structure shown in Fig. 2, so the same portions will not be described, and only the differences from Fig. 2 will be described.

As shown in FIG. 3, the inner notch of the first notch 15 of the second sensitive strain zone of the present invention communicates with the first deformation hole 18, and the outer notch communicates with the outer end surface of the elastic body 2, and the first deformation hole 18 is disposed at The outer side of the second strain hole, the first notch 15 is an oblique vertical slot or a Z slot or a square wave notch or an L-shaped slot or an L-shaped slot connected by two or more phases, the present invention The first overload gap α of the first slot 15 is between 0.05 and 1.00 mm, and overload protection can be achieved by the first slot 15.

As shown in FIG. 3, the inner notch of the second notch 9 of the third sensitive strain zone of the present invention communicates with the second deformation hole 17, and the outer notch communicates with the outer end surface of the elastic body 2, and the second deformation hole 17 is disposed at The outer side of the third strain hole 8, the second notch 9 is an inclined vertical slot or Z slot or square wave slot or V-shaped slot or L-shaped slot or L-shaped connected by two or more The notch, the second overload gap β of the second slot 9 is between 0.05 and 1.00 mm, and the second overload gap β is at 0.1 mm, 0.25 mm or 0.5 mm or 0.8 mm, etc., and is overloaded by the second slot 9 protection.

4 is a cross-sectional view showing an elastomer structure of a multi-range load cell according to a third embodiment of the present invention. Figure. The elastomer structure shown in Fig. 4 is similar to the elastomer structure shown in Fig. 2, so the same portions will not be described, and only the differences from Fig. 2 will be described.

As shown in Fig. 4, the second sensitive strain zone, the third sensitive strain zone and the first sensitive strain zone are vertically arranged from top to bottom. However, it is also conceivable to those skilled in the art that the second sensitive strain zone, the third sensitive strain zone and the first sensitive strain zone can also be vertically arranged from bottom to top. The invention may further have a third sensitive strain zone and a fourth sensitive strain zone between the first sensitive strain zone and the second sensitive strain zone, and the structure of the fourth sensitive strain zone is the same as the structure of the third sensitive strain zone, The bearing capacity increases from the second sensitive strain zone, the third sensitive strain zone, the fourth sensitive strain zone to the first sensitive strain zone, and can be set according to requirements. Similarly, the sensitive areas can be sequentially arranged in order according to the corresponding bearing capacity.

As shown in FIG. 4, the first notch 15 is disposed between the second sensitive strain zone and the third sensitive zone, and the first notch 15 is an inclined vertical slot or a Z slot or a square wave slot or an L shape. The first overload gap α of the first notch 15 is between 0.05 and 1.00 mm. The second slot 9 is disposed between the third sensitive sensing region and the first sensitive region. The second notch 9 is an inclined vertical slot or a Z slot or a square wave slot or a V-shaped slot or an L-shaped slot or an L-shaped slot connected by two or more, and the intermediate bent slot The second overload gap β of the port is between 0.05 and 1.00 mm.

Figure 5 is a cross-sectional view showing the structure of an elastomer of a multi-range load cell according to a fourth embodiment of the present invention. The elastomer structure shown in Fig. 5 is similar to the elastomer structure shown in Fig. 2, so the same portions will not be described, and only the differences from Fig. 2 will be described.

As shown in FIG. 5, the first sensitive strain zone and the third sensitive strain zone are horizontally arranged from left to right or from right to left, and the second sensitive strain zone is located above the first sensitive strain zone and the third sensitive strain zone. However, it is also conceivable by one of ordinary skill in the art that the second sensitive strain zone may also be located below the first sensitive strain zone and the third sensitive strain zone. The invention may further have a third sensitive strain zone and a fourth sensitive strain zone between the first sensitive strain zone and the second sensitive strain zone, and the structure of the fourth sensitive strain zone is the same as the structure of the third sensitive strain zone, The bearing capacity increases from the second sensitive strain zone, the third sensitive strain zone, the fourth sensitive strain zone to the first sensitive strain zone, and can be set according to requirements. Similarly, each sensitive area may also be sequentially arranged in a horizontal and vertical arrangement according to the corresponding bearing capacity. For example, the second sensitive strain zone and the third sensitive strain zone are horizontally arranged from left to right or from right to left, and the first sensitive strain zone is located above or below the second sensitive strain zone and the third sensitive strain zone. As shown in FIG. 5, the first notch 15 is disposed between the second sensitive strain zone and the third sensitive zone, and the first notch 15 is an inclined vertical slot or a Z slot or a square wave slot or an L shape. The first overload gap α of the first notch 15 is between 0.05 and 1.00 mm. The second slot (9) is disposed on the intermediate overload beam 10 of the third sensitive strain zone, and both ends of the second slot 9 communicate with the third strain hole 8. The second notch 9 is an inclined vertical slot or Z slot or square wave slot or a V-shaped slot or an L-shaped slot or an L-shaped slot connected by two or more, and the intermediate bent slot The second overload gap β of the port is between 0.05 and 1.00 mm. It is apparent to those skilled in the art that various modifications and changes may be made to the above-described exemplary embodiments of the present invention without departing from the spirit and scope of the invention. Therefore, it is intended that the present invention cover the modifications and modifications of the invention

Claims

claims

1. An elastomer structure of a multi-range load cell, including a fixed part and a strain part. The fixed part includes a printed board mounting hole (3) on the elastomer (2), characterized by: the strain part It includes at least two sensitive strain zones with different load ranges arranged on the elastomer (2), the first sensitive strain zone has a first strain hole (6), and the first strain hole (6) is located at the thin wall and is useful for fixation. In the first set of strain gauges (5) for measuring the first range load, the second sensitive strain area has a second strain hole (12). The second strain hole (12) is located at the thin wall and is fixed with a second strain gauge for measuring the second range load. The second set of strain gauges (11),

Wherein, the first notch (15) with the first overload gap α is provided inside the second strain hole (12) or between the second strain hole (12) and the next load larger than the second range. between the strains corresponding to the range load.

2. The elastomer structure of a multi-range load cell according to claim 1, characterized in that: the strain part of the elastomer (2) also has a The third sensitive strain area has a third strain hole (8). The third strain hole (8) is located at the thin wall and is fixed with a third set of strain gauges (7) for measuring the third range load. ;

Wherein, the second notch (9) with the second overload gap β is provided inside the third strain hole (8) or the third strain hole (12) and the next load larger than the third range. between the strains corresponding to the range load,

Wherein, the second measurement range, the third measurement range and the first measurement range increase in sequence.

3. The elastomer structure of a multi-range load cell according to claim 2, characterized in that the second sensitive strain area, the third sensitive strain area and the first sensitive strain area are arranged in the following manner Any arrangement:

The second sensitive strain area, the third sensitive strain area and the first sensitive strain area are arranged horizontally from left to right;

The second sensitive strain area, the third sensitive strain area and the first sensitive strain area are arranged horizontally from right to left;

The second sensitive strain area, the third sensitive strain area and the first sensitive strain area are arranged vertically from top to bottom;

The second sensitive strain area, the third sensitive strain area and the first sensitive strain area are arranged vertically in sequence from bottom to top; The first sensitive strain area and the second sensitive strain area are arranged horizontally from left to right or from right to left, and the third sensitive strain area is located between the first sensitive strain area and the second sensitive strain area. above or below the zone; or

The second sensitive strain area and the third sensitive strain area are arranged horizontally from left to right or from right to left, and the first sensitive strain area is located between the second sensitive strain area and the third sensitive strain area. area above or below.

4. The elastomer structure of a multi-range load cell according to claim 3, characterized in that: the thickness of the thin wall at the third strain hole (8) in the third sensitive strain zone is greater than that of the second sensitive strain zone. The thin wall thickness at the second strain hole (12) is smaller than the thin wall thickness at the first strain hole (6) of the first sensitive strain zone.

5. The elastomer structure of the multi-range load cell according to claim 1, characterized in that: the first notch (15) is provided on the first overload beam of the second sensitive strain zone.

6. The elastomer structure of a multi-range load cell according to claim 1, characterized in that: the inner notch of the first notch (15) communicates with the first deformation hole (18), and the outer notch communicates with the first deformation hole (18). The outer end surfaces of the elastic body (2) are connected, and the first deformation hole (18) is arranged outside the second strain hole (12).

7. The elastomer structure of a multi-range load cell according to claim 1, characterized in that: the first notch (15) is provided between the second sensitive strain area and the third sensitive area. .

8. The elastomer structure of a multi-range load cell according to any one of claims 4 to 6, characterized in that: the first notch (15) is an inclined vertical notch or a Z notch or Square wave notch or L-shaped notch or V-shaped notch, the first overload gap α of the first notch (15) is between 0.05 ~ 1.00 mm.

9. The elastomer structure of a multi-range load cell according to claim 2, characterized in that: the second notch (9) is provided on the middle overload beam (10) of the third sensitive strain zone, Both ends of the second notch (9) are connected with the third strain hole (8).

10. The elastomer structure of a multi-range load cell according to claim 2, characterized in that: the inner notch of the second notch (9) communicates with the second deformation hole (17), and the outer notch communicates with the second deformation hole (17). The outer end surfaces of the elastic bodies are connected, and the second deformation hole (17) is arranged outside the third strain hole (8).

11. The elastomer structure of a multi-range load cell according to claim 2, characterized in that: the second notch (9) is provided between the third sensitive strain area and the first sensitive area. .

12. The elastomer structure of a multi-range load cell according to any one of claims 9 to 11, characterized in that: the second notch (9) is an inclined vertical notch or a Z notch or Square Wave Notch or V shaped notch or L-shaped notch or two or more connected L-shaped notches, and the second overload gap β of the middle bent-shaped notch is between 0.05 ~ 1.00 mm.