CN105300493A - Direct-buried type bent plate weighing sensor - Google Patents

Abstract

The invention provides a direct-buried type bent plate weighing sensor, and the sensor comprises a strain plate with a strain gauge, and also comprises two limiting assemblies for limiting the strain plate. The limiting assemblies enable two ends of the strain plate to be lapped on the limiting assemblies to form a simply supported beam structure. Moreover, gaps are formed between end faces of the strain plate and the limiting assemblies. The weighing sensor can effectively avoid the unrecoverable deformation of the strain plate in an application process, can effectively improve the detection sensitivity, and improves the accuracy of detection results. According to the invention, an elastic limiting body is made of organic materials, and the weighing sensor has the performance of complete sealing, does not need a foundation trench and a drainage system while guaranteeing that the sensor is installed on a road, is directly buried in a superficial region of a road surface, forms a body with the road surface, reduces the installation, use and maintenance cost, and improves the reliability of the whole structure.

Description

Direct burial bent plate LOAD CELLS

Technical field

The present invention relates to a kind of Weighing equipment, particularly relate to a kind of direct burial bent plate LOAD CELLS.

Background technology

Direct burial bent plate LOAD CELLS is widely used in highway weight metering charging and transfinites in inspection field, provides a great convenience for administering overload of vehicle, highway safety bridge security and reducing traffic hazard.

There are the following problems for existing direct burial bent plate LOAD CELLS: in existing direct burial bent plate LOAD CELLS, strain plate is fixedly connected with as the base plate supported, the sensitivity of sensor and the accuracy of metering can also be ensured in the use starting stage, owing to bearing pressure in strain plate Long-Time Service, and the end, two ends of strain plate is fixed, thus make strain plate that expendable deformation easily occur, thus the sensitivity of sensor and accuracy is caused greatly to reduce.

Existing direct burial bent plate LOAD CELLS, due to reasons in structure, can not work for a long time in water, needs on highway, make large volume excavation during installation, build concrete basis, form sensor pre-installation structure, and the trench drain (pipe) across road need be set, reach draining object.Installation work is large to the destruction of road, and installation cost is high and the time that suspends traffic is long.

Therefore, need to propose a kind of new direct burial bent plate LOAD CELLS, effectively can prevent in use straining plate and occur expendable deformation, and effectively can improve the detection sensitivity of sensor, improve the accuracy of testing result.

Summary of the invention

In view of this, the object of this invention is to provide a kind of direct burial bent plate LOAD CELLS, effectively can prevent in use straining plate and occur expendable deformation, and effectively can improve the detection sensitivity of sensor, improve the accuracy of testing result.

A kind of direct burial bent plate LOAD CELLS provided by the invention, comprise the strain plate that is provided with strainometer and for carrying out two spacing limit assemblies to strain plate, the two ends lapping ends straining plate described in limit assembly forms simple beam structure in limit assembly, and has gap between the end face of strain plate and limit assembly.

Further, described limit assembly comprises backing plate and block, described block is fixedly connected with backing plate is detachable, and the lapping ends of described strain plate forms some supporting constructions or bar shaped supported structure and has gap between the end face of strain plate and block on backing plate.

Further, described block is towards the side sinking forming station terrace structure of strain plate, and the step surface of block coordinates with backing plate and forms embedded groove, and the end of described strain plate can be embedded in embedded groove and to strain the end face of plate and block has gap.

Further, the end lower surface of described strain plate sinks to forming groove, strainometer is arranged in groove and the mode that strainometer is increased to centre by the two ends straining plate gradually according to spacing is arranged, and the strainometer be positioned in the middle of strain plate is equidistantly arranged, described groove is near being supported on backing plate with the sidewall of block as the strong point straining plate, and the end upper surface of described strain plate is that the end face of step surface structural strain plate and step surface all have gap with block.

Further, elastic spacing body is filled with in described gap.

Further, also comprise a base plate, two limit assembly detachable two ends being arranged at base plate respectively, described backing plate is between base plate and block.

Further, described base plate corresponds to the groove straining plate and is provided with handle hole.

Further, the detachable cover plate be provided with for covering described handle hole of the lower surface of described base plate.

Beneficial effect of the present invention: direct burial bent plate LOAD CELLS provided by the invention, be not fixedly connected with by strain plate with limit assembly and strain between the end face of plate and limit assembly and there is gap, when receiving strain plate when strain occurs pressure, there is flexible surplus, effectively can prevent in use straining plate and occur expendable deformation, and effectively can improve the detection sensitivity of sensor, improve the accuracy of testing result.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the invention will be further described:

Fig. 1 is structural representation of the present invention.

Fig. 2 is the schematic diagram of load F position of the present invention between B and B ' point.

Fig. 3 is the schematic diagram of load F position of the present invention between A and B point.

Fig. 4 is the schematic diagram of load F position of the present invention between M and A point.

Fig. 5 is the schematic diagram of solid intermittent load F position, sensor two ends between B and B ' point.

Fig. 6 is the schematic diagram of solid intermittent load F position, sensor two ends between A and B point.

Fig. 7 is the schematic diagram of solid intermittent load F position, sensor two ends between M and A point.

Fig. 8 is the structural representation of the gap-fill elastic spacing body in Fig. 1.

Embodiment

Fig. 1 is structural representation of the present invention, a kind of direct burial bent plate LOAD CELLS provided by the invention, comprise the strain plate 1 that is provided with strainometer 4 and for carrying out two spacing limit assemblies to strain plate 1, the two ends lapping ends of described strain plate 1 forms simple beam structure in limit assembly, and between the end face of strain plate 1 and limit assembly, there is gap 6, by this structure, effectively can prevent in use straining plate and occur expendable deformation, and effectively can improve the detection sensitivity of sensor, improve the accuracy of testing result.

In the present embodiment, described limit assembly comprises backing plate 9 and block 8, described block 8 is fixedly connected with backing plate 9 is detachable, the lapping ends of described strain plate 1 forms some supporting constructions or bar shaped supporting construction and has gap between the end face of strain plate 1 and block 8 on backing plate 9, the structure that plate is fixedly connected with backing plate is strained in prior art, screw is such as adopted to connect, when straining plate and being stressed, strain plate generation deformation has certain extension in the longitudinal direction, and this extension all acts on the tie point of strain plate, thus the concentrated strain plate that causes of stress produces expendable deformation, and in the present embodiment, strain plate and backing plate overlap and refer to that the end straining plate is arranged on backing plate, but strain plate and backing plate to adopt fixture to carry out indefinite, when straining plate and being stressed, strain plate can extend in the longitudinal direction on backing plate, after having weighed, strain plate can recover in time, thus ensure that the serviceable life of LOAD CELLS and the sensitivity of metering, wherein, point supporting construction is that the end of strain plate contacts with the strong point with between backing plate, bar shaped supporting construction is that the end of strain plate contacts with the narrower strip shaped contact face being transverse direction between backing plate.

In the present embodiment, described block 8 is towards the side sinking forming station terrace structure of strain plate 1, and the step surface of block 8 coordinates with backing plate and forms embedded groove 7, the end of described strain plate 1 can be embedded in embedded groove 7 and the end face of strain plate 1 and block 8 have gap, that is to say that the sidewall end mask of the strain end face of plate and the bottom of embedded groove and embedded groove has gap, as shown in Figure 1, by this structure, can be formed spacing in the longitudinal direction with on thickness direction of strain plate, be beneficial to and form globality structure, and obstruction can not be caused to the extension produced during strain plate generation deformation.

In the present embodiment, the end lower surface of described strain plate 1 sinks to forming groove 3, strainometer 4 is arranged in groove and the mode that strainometer 4 is increased to centre by the two ends straining plate 1 gradually according to spacing is arranged, and the strainometer 4 be positioned in the middle of strain plate 1 is equidistantly arranged, described groove 3 is near being supported on backing plate 9 with the sidewall of block 8 as the strong point 5 straining plate 1, the end upper surface of described strain plate 1 is step surface structure, end face and the step surface 12 of strain plate 1 all have gap with block, by this structure, be convenient to the setting of strainometer on the one hand, what is more important, when straining plate and being stressed, produce stress between the strong point of strain plate and backing plate to concentrate, but it is on the direction, plate face perpendicular to strain plate that this stress is concentrated, instead of the length direction produced at strain plate, therefore any expendable impact can not be produced on strain plate, and effectively can improve the sensitivity of metering.

In the present embodiment; elastic spacing body 13 is filled with in described gap 6; wherein; elastic spacing body can adopt rubber bodies etc.; in the present embodiment, limited employing elastomeric material is filled; by this structure; can carry out effectively spacing to strain plate on the one hand; make the two ends of strain plate form closed structure, protection is formed to strainometer, on the other hand; because elaxtic seal has elasticity; can not reacting force be formed when straining when plate is stressed to extend in the longitudinal direction, thus protection strain plate, and ensure the accuracy of metering.

In the present embodiment, also comprise a base plate 2, two limit assembly detachable two ends being arranged at base plate 2 respectively, described backing plate 9, between base plate 2 and block 8, by this structure, is beneficial to the present invention and forms a globality structure, the laying being beneficial to product uses, and by the effect of backing plate, make, between strain plate and base plate, there is enough deformation spaces, ensure the accuracy of metering.

In the present embodiment, groove 3 place that described base plate 2 corresponds to strain plate 1 is provided with handle hole 11, by this structure, is beneficial to and overhauls the support equipment of strainometer and strainometer, easy to use.

In the present embodiment, the detachable cover plate 10 be provided with for covering described handle hole 11 of the lower surface of described base plate 2, by this structure, is beneficial to the opening and closing of handle hole, effectively protects strainometer; Detachable in above-mentioned is fixedly connected with, and adopts the connection of existing screw, bolt connection etc.

Below by the present invention and traditional sensors force analysis, the present invention is further described:

As shown in Figure 2, when load F is positioned between B and B ', dependent variable calculates in the following manner:

The square at fulcrum M place is:

now carry out analysis to A point can obtain: M _a=F _mthe dependent variable at a, A point place is: wherein, in like manner, the dependent variable put for B point, A ' point, B ' is respectively:

${\mathrm{\ϵ}}_B=\frac{{\mathrm{\δ}}_B}{E}=\frac{bhF(l-r)}{2EIl},{{\mathrm{\ϵ}}_A}^{\′}=\frac{{\mathrm{\δ}}_{A^{\′}}}{E}=\frac{Frah}{2EIl},{{\mathrm{\ϵ}}_B}^{\′}=\frac{{\mathrm{\δ}}_{B^{\′}}}{E}=\frac{Frbh}{2EIl},$ A and A', B and B' summation can obtain:

$\left\{\begin{array}{c}{\mathrm{\ϵ}}_A+{{\mathrm{\ϵ}}_A}^{\′}=\frac{ahF}{2EI}\\ {\mathrm{\ϵ}}_B+{{\mathrm{\ϵ}}_B}^{\′}=\frac{bhF}{2EI}\end{array}\right.,$ Therefore, total dependent variable is: from total dependent variable, when load F has nothing to do in the strain summation shown in Fig. 1 during position and the point of application distance to fulcrum M, only relevant to each strainometer position (A namely in Fig. 1, A', B and B' are to the distance of fulcrum), h, E, I and l (h be strain the height of plate, E is elastic modulus, I cross sectional moment of inertia and l be for straining plate length), and to strain summation be a definite value between B ' and B.

As shown in Figure 3, when load F is between A and B of position, now, can obtain the analysis of B point: $M_B=F\·(1-\frac{r}{l})\·b-F\·(b-r),$ Therefore: ${\mathrm{\ϵ}}_B=-\frac{F\·r\·(l-b)\·h}{2EIl},$ In like manner can in the hope of ε _a' and ε _b', A and A', B and B' summation can obtain: $\left\{\begin{array}{c}{\mathrm{\ϵ}}_A+{{\mathrm{\ϵ}}_A}^{\′}=\frac{Fha}{2EI}\\ {\mathrm{\ϵ}}_B+{{\mathrm{\ϵ}}_B}^{\′}=\frac{Fhr}{2EI}\end{array}\right.,$ Therefore, known by above formula: ε _withstrain summation relevant with r, i.e. ε _withchange along with the change of the position of F.

As shown in Figure 4, when load F is between fulcrum M and A point:

Carrying out analysis to A point can be in the hope of: $M_A=Fr(1-\frac{a}{l}),{\mathrm{\ϵ}}_A=\frac{Frh}{2EI}(1-\frac{a}{l})$

Carrying out analysis to B point can be in the hope of: $M_B=Fr(1-\frac{b}{l}),{\mathrm{\ϵ}}_B=\frac{Frh}{2EI}(1-\frac{b}{l})$

Carrying out analysis to A' point can be in the hope of:

Carrying out analysis to B' point can be in the hope of:

Can obtain strain A and A', B and B' summation: $\left\{\begin{array}{c}{\mathrm{\ϵ}}_A+{{\mathrm{\ϵ}}_A}^{\′}=\frac{Fhr}{2EI}\\ {\mathrm{\ϵ}}_B+{{\mathrm{\ϵ}}_B}^{\′}=\frac{Fhr}{2EI}\end{array}\right.$

Therefore: ε _with=(ε _b+ ε _b')-(ε _a+ ε _a')=0, therefore, under this kind of state, can not gather out data;

Therefore, when F effect and B and B' region, ε and be a permanent value, when namely tire acts on B and B' region, it is all identical that tire acts on the strain data that any position system of strain plate gathers.

When straining plate two ends and all fixing:

As shown in Figure 4, when load F is positioned between B and B ', square is got to M point, $F_M=\frac{M_M-M_N-Fr+Fl}{l}$

Can obtain A point analysis:

$M_A=F_{M}a-M_M=\frac{a(M_M-M_N-Fr+Fl)-M_{M}l}{l}$

${\mathrm{\δ}}_A=\frac{M_A\·h}{2I}=\frac{a(M_M-M_N-Fr+Fl)-M_{M}l}{2Il}h$

Therefore ${\mathrm{\ϵ}}_A=\frac{{\mathrm{\δ}}_A}{E}=\frac{a(M_M-M_N-Fr+Fl)-M_{M}l}{2IlE}h$

In like manner, carrying out analysis to B point can be in the hope of:

$M_B=F_{M}b-M_M=\frac{b(M_M-M_N-Fr+Fl)-M_{M}l}{l}$

${\mathrm{\δ}}_B=\frac{M_B\·h}{2I}=\frac{b(M_M-M_N-Fr+Fl)-M_{M}l}{2Il}h$

Therefore ${\mathrm{\ϵ}}_B=\frac{{\mathrm{\δ}}_B}{E}=\frac{b(M_M-M_N-Fr+Fl)-M_{M}l}{2IlE}h$

In like manner, carrying out analysis to A' point can be in the hope of:

In like manner, carrying out analysis to B' point can be in the hope of:

Can obtain strain A and A', B and B' summation:

$\left\{\begin{array}{c}{\mathrm{\ϵ}}_A+{{\mathrm{\ϵ}}_A}^{\′}=\frac{2a(M_M-M_N-Fr)+(Fa-M_M-M_N)l}{2EI}h\\ {\mathrm{\ϵ}}_B+{{\mathrm{\ϵ}}_B}^{\′}=\frac{2b(M_M-M_N-Fr)+(Fb-M_M-M_N)l}{2EI}h\end{array}\right.$

:

ε _withvalue relevant with r, and M _m, M _nbe not definite value, i.e. a ε _withchange along with the change of the position of F;

As shown in Figure 5, when load F is between A and B, can obtain A point analysis:

$M_A=F_{M}a-M_M=\frac{a(M_M-M_N-Fr+Fl)-M_{M}l}{l}$

${\mathrm{\δ}}_A=\frac{M_A\·h}{2I}=\frac{a(M_M-M_N-Fr+Fl)-M_{M}l}{2Il}h$

Therefore ${\mathrm{\ϵ}}_A=\frac{{\mathrm{\δ}}_A}{E}=\frac{a(M_M-M_N-Fr+Fl)-M_{M}l}{2IlE}h$

In like manner, carrying out analysis to B point can be in the hope of:

$M_B=F_{M}b-M_M-F(b-r)=\frac{b(M_M-M_N-Fr)-M_{M}l+Flr}{l}$

${\mathrm{\δ}}_B=\frac{M_B\·h}{2I}=\frac{b(M_M-M_N-Fr)-M_{M}l+Flr}{2Il}h$

Therefore ${\mathrm{\ϵ}}_B=\frac{{\mathrm{\δ}}_B}{E}=\frac{b(M_M-M_N-Fr)-M_{M}l+Flr}{2IlE}h$

In like manner, carrying out analysis to A' point can be in the hope of:

In like manner, carrying out analysis to B' point can be in the hope of:

Can obtain strain A and A', B and B' summation:

$\left\{\begin{array}{c}{\mathrm{\ϵ}}_A+{{\mathrm{\ϵ}}_A}^{\′}=\frac{2a(M_M-M_N-Fr)+(Fa-M_M-M_N)l}{2EI}h\\ {\mathrm{\ϵ}}_B+{{\mathrm{\ϵ}}_B}^{\′}=\frac{2b(M_M-M_N-Fr)+(Fr-M_M-M_N)l}{2EI}h\end{array}\right.$

:

ε _withvalue relevant with r, and M _m, M _nbe not definite value, i.e. a ε _withchange along with the change of the position of F;

As shown in Figure 6, when load F is between fulcrum M and A, can obtain A point analysis:

$M_A=F_{M}a-M_M-F(a-r)=\frac{a(M_M-M_N-Fr)-M_{M}l+Flr}{l}$

${\mathrm{\δ}}_A=\frac{M_A\·h}{2I}=\frac{a(M_M-M_N-Fr)-M_{M}l+Flr}{2Il}h$

Therefore ${\mathrm{\ϵ}}_A=\frac{{\mathrm{\δ}}_A}{E}=\frac{a(M_M-M_N-Fr)-M_{M}l+Flr}{2IlE}h$

In like manner, carrying out analysis to B point can be in the hope of:

$M_B=F_{M}a-M_M-F(b-r)=\frac{b(M_M-M_N-Fr)-M_{M}l+Flr}{l}$

${\mathrm{\δ}}_B=\frac{M_B\·h}{2I}=\frac{b(M_M-M_N-Fr)-M_{M}l+Flr}{2Il}h$

Therefore ${\mathrm{\ϵ}}_B=\frac{{\mathrm{\δ}}_B}{E}=\frac{b(M_M-M_N-Fr)-M_{M}l+Flr}{2IlE}h$

In like manner, carrying out analysis to A' point can be in the hope of:

In like manner, carrying out analysis to B' point can be in the hope of:

Can obtain strain A and A', B and B' summation:

$\left\{\begin{array}{c}{\mathrm{\ϵ}}_A+{{\mathrm{\ϵ}}_A}^{\′}=\frac{2a(M_M-M_N-Fr)+(Fa-M_M-M_N)l}{2EI}h\\ {\mathrm{\ϵ}}_B+{{\mathrm{\ϵ}}_B}^{\′}=\frac{2b(M_M-M_N-Fr)+(Fr-M_M-M_N)l}{2EI}h\end{array}\right.$

:

ε _withvalue relevant with r, and M _m, M _nbe not definite value, i.e. a ε _withchange along with the change of the position of F.

In sum, when bending plate type sensor two ends are fixed, load F in B, B' region, A, B region, M, a-quadrant motion time, ε _witha definite value can not be kept in certain region, always in continuous change, namely the system strain data that can gather because of the difference of tire active position is different, and these data for accurate acquisition strain plate are very unfavorable, and need a large amount of data analyses and evaluation work when late time data process; And when adopting of the present invention, when load F acts on strain plate BB' region, the strain data that any position system that load F acts on this region gathers is all identical, this guarantees consistance and the accuracy of strain plate image data, be very easy to the process of strain plate strain data, substantially increase the precision of load bearing system, also considerably reduce cost simultaneously.

What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.

Claims (8)

1. a direct burial bent plate LOAD CELLS, it is characterized in that: comprise the strain plate that is provided with strainometer and for carrying out two spacing limit assemblies to strain plate, the two ends lapping ends straining plate described in limit assembly forms simple beam structure in limit assembly, and has gap between the end face of strain plate and limit assembly.

2. direct burial bent plate LOAD CELLS according to claim 1, it is characterized in that: described limit assembly comprises backing plate and block, described block is fixedly connected with backing plate is detachable, and the lapping ends of described strain plate is on backing plate and form some supporting construction or bar shaped supporting construction and have gap between the end face of strain plate and block.

3. direct burial bent plate LOAD CELLS according to claim 2, it is characterized in that: described block is towards the side sinking forming station terrace structure of strain plate, and the step surface of block coordinates with backing plate and forms embedded groove, the end of described strain plate can be embedded in embedded groove and the end face of strain plate and block have gap.

4. direct burial bent plate LOAD CELLS according to claim 3, it is characterized in that: the end lower surface of described strain plate sinks to forming groove, strainometer is arranged in groove and the mode that strainometer is increased to centre by the two ends straining plate gradually according to spacing is arranged, and the strainometer be positioned in the middle of strain plate is equidistantly arranged, described groove is near being supported on backing plate with the sidewall of block as the strong point straining plate, and the end upper surface of described strain plate is that the end face of step surface structural strain plate and step surface all have gap with block.

5. direct burial bent plate LOAD CELLS according to the arbitrary claim of claim 1-4, is characterized in that: be filled with elastic spacing body in described gap.

6. direct burial bent plate LOAD CELLS according to claim 4, it is characterized in that: also comprise a base plate, two limit assembly detachable two ends being arranged at base plate respectively, described backing plate is between base plate and block.

7. direct burial bent plate LOAD CELLS according to claim 6, is characterized in that: the groove that described base plate corresponds to strain plate is provided with handle hole.

8. direct burial bent plate LOAD CELLS according to claim 7, is characterized in that: the detachable cover plate be provided with for covering described handle hole of the lower surface of described base plate.