GB2191867A - Weight measuring device for vehicles - Google Patents
Weight measuring device for vehicles Download PDFInfo
- Publication number
- GB2191867A GB2191867A GB08712136A GB8712136A GB2191867A GB 2191867 A GB2191867 A GB 2191867A GB 08712136 A GB08712136 A GB 08712136A GB 8712136 A GB8712136 A GB 8712136A GB 2191867 A GB2191867 A GB 2191867A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bar
- weight
- load
- deflection
- sensing device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/08—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for incorporation in vehicles
- G01G19/12—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for incorporation in vehicles having electrical weight-sensitive devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/02—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles
- G01G19/021—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles having electrical weight-sensitive devices
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Balance (AREA)
Abstract
A weight-sensing device eg for incorporation within a weighbridge comprises a deflection bar (4) mounted upon supports (1) and engaged by load-applying members (8), a strain gauge pair (9, 10) being attached to the deflection bar (4). Signals from said gauges (9, 10) are received by an analyser device which calculates the live load on the members (8). The weighbridge may comprise several weight sensing devices and each device may be provided with several strain gauge pairs, in which case the analyser may indicate the total load and the load distribution. Alternatively, the bar may constitute the pivot shaft (15) of a tipper truck body (Figs. 8-11). <IMAGE>
Description
SPECIFICATION
Weight measuring device for vehicles
The subject of this invention is a weight measuring device for vehicles. The device of the invention may take either of two forms. In one form it may be arranged as a fitment for a vehicle or as an integral part of a vehicle. In the other form it may be arranged as a weighbridge.
Stringent regulations now govern the maximum loads which commercial vehicles are permitted to carry. The customary method of finding the load placed on a vehicle has been to drive a vehicle to a weighbridge, weigh the whole vehicle if necessary in more than one stage by weighing separately the load carried by the different groups of wheels and then subtract the tare weight of the vehicle. This is a clumsy operation and in several respects an uneconomical operation. First the vehicle has to be loaded with a load which is estimated to be within the permitted load. Then the vehicle has to be driven to a weighbridge and the actual load on the vehicle found.If the estimated load has been seriously underestimated or if it has been overestimated and the vehicle is consequently overloaded the vehicle has to be driven back to the loading point and either more load added if the load is underweight or some load removed if the vehicle is overloaded, followed preferably by a second journey to the weighbridge. The weighbridge may be several kilometres away and in such a case it is frequently considered cheaper where the vehicle is underloaded to continue with the underload without returning to its base. This can represent a considerable loss in the operation of the vehicle over a year, for example.
The loss has been found in many cases to be as much as 10%. An additional danger is where a vehicle is to pick up a load during its journey and thus although within the limit of loading when leaving its base may perform part of its journey in an overloaded condition.
It is one object of the invention to provide a weight measuring device which may be readily incorporated in a vehicle so that the weight of the vehicle is readily ascertainable at any time.
There are however many situations where a weighbridge is necessary and it is also an object of the invention to provide the device of the invention in the form of a weighbridge.
Various proposals have been made for providing apparatus on a vehicle for ascertaining the load carried by a vehicle. One such system measures the deflection of the springs of the vehicle under load by providing distance sensitive transducers between the chassis of the vehicle and the axles. The disadvantage of this system is that it measures the complete sprung weight of the vehicle including the weight of the driver and the weight of the fuel carried and this sprung weight has to be accurately known. Another device proposed incorporates strain gauges inserted within the axles of the vehicle.This device also measures the all up weight of the vehicle and apart from the same disadvantage shown by the other known systems of requiring knowledge of the weight of the driver and the weight of the fuel carried can mean some reduction in the strength of the axles because of the cavity required in the axles to contain the transducers. The most advantageous form of weight measuring device would be a device which displayed only the weight of the load container and its contained load with preferably provision for correcting for the constant weight of the container. The present invention provides such a device.
A weighbridge as at present constructed usually consists of a vehicle-supporting platform connected by an arrangement of levers to a steelyard. The known weighbridges are expensive to construct, require quite a deep pit to accommodate the mechanism and an operator to be in attendance, with the additional disadvantage that they can be used only during the time the operator is in attendance.
Carelessly operated such a weighbridge can give a false reading of the weight of a vehicle on the platform of the weighbridge.
The present invention also provides a weight measuring device in the form of a weighbridge which is of simple construction, has only a few robust parts and requires either a shallow pit or no pit at all. It may also if desired be constructed to be mobile.
A weight-sensing device according to the invention is characterized by incorporating at least one deflection bar supported at two points longitudinally spaced along the bar, two load-applying members mounted on the deflection bar at points longitudinally spaced along the bar from the points where the bar is supported, strain gauges attached to the deflection bar at points above and below the neutral axes of the bar and an analyser device operatively connected to the strain gauges to receive signals of strain therefrom, analyse said signals using information previously stored in the analyser relating to the physical dimensions of the device and the characteristics of the material of the deflection bar and convert them into terms of the live load on the load-applying members and show said load in an intelligible form.
The load-applying members may bear on the deflection bar outside or between the points where the bar is supported. When located outside said support points any load applied to the members will cause the portions of the deflection bar between said support points to deflect upwardly and if mounted between said support points a load on the load-applying members will cause the portions of the deflection bar between said support points to deflect downwardly.
The support points may be constituted by vertical members incorporating upwardly extending plates through which the deflection bar projects so that the plates act as fulcra for the bar. Alternatively the support points may be constituted by bars transverse to the deflection bar and on which the deflection bar rests.
The deflection bar may be a single bar which may be in the form of an H beam with the web arranged in a vertical plane, one strain gauge being then attached to the upper flange and the other strain gauge being attached to the lower flange. Alternatively the deflection bar may comprise two parallel bar components spaced from one another in a vertical direction one strain gauge being attached to the upper bar component and the other strain gauge being attached to the lower bar component.
The deflection bar or each or any particular deflection bar may be formed of three sections connected to one another in line so that the bar is formed of a centre section and two end sections.
The three sections of the bar may be fastened to one another by flanges fitted to the adjacent ends of the sections. The centre section of the bar may have a different cross sectional shape from the cross sectional shape of the end sections of the bar, for example the end sections of the bar may be circular in cross section whereas the centre section may be rectangular in cross section or may be of "H" section, i.e. with a vertical web and two horizontal flanges. In this latter construction the calculation of the weight is more accurate because the whole of each strain gauge is then at the same distance from the horizontal plane containing the neutral axis of the centre portion.
Two or more pairs of strain gauges may be fitted to the bar at spaced points on the bar.
In this case the analyser is arranged to combine the signals from the individual pairs of strain gauges and use them to calculate the load on the bar or to treat the signals separately.
A weighbridge may incorporate two weight sensing units, each unit incorporating at least one weight sensing device as described the two units being disposed with their deflection bars parallel with one another and spaced from one another, said two units being interconnected by a platform connected to the load members of the two weight-sensing devices, said platform being arranged to receive a vehicle to be weighed. Each device may incorporate its own analyser so that an indication of the weight distribution between the front and rear axles may be obtained or one analyser may be arranged to receive the signals from all the strain gauges and provide simply an indication of the total weight of the vehicle.
Each weight sensing unit may comprise two weight-sensing devices as described above arranged in side by side parallel relationship.
With this construction the two sides of the vehicle are weighed separately. Apart from the advantage of requiring less excavation where the weighbridge is to be level with the surrounding ground surface there is another very important advantage in that asymmetric loading of the vehicle can be detected. This aspect is described later in the specification.
Where the device is fitted to a tipping vehicle the existing pivot bar of the vehicle may be adapted to become the deflection bar of the present invention. Alternatively the existing pivot bar of the vehicle may be removed and a new deflection bar according to the invention fitted in place of it.
Where the device is formed as a weighbridge the support points of the or each deflection bar may be constituted by pedestals which may be attached to a prepared base such as concrete slabs or they may be mounted on a base plate so that the weighbridge is readily moved as a unit. Where the device constructed as a weighbridge is to be used at ground level without a pit to contain it there may be provided at each end a ramp to facilitate movement of a vehicle on to the platform.
Where the device is fitted to a vehicle said support points may be provided by vertical members connected at their lower ends to the chassis of the vehicle.
An existing non-tipping lorry may be fitted with the device of the invention by removing the existing supports for the ioad-carrying platform or container and replacing them by a device or several devices according to the invention, the load-carrying platform or container being connected to the struts.
The device of the invention is applicable to any form of vehicle but is particularly suitable for use with tippers employing a hydraulic tipping cylinder at the front of the load container and a transverse pivot at the rear of the load container about which the load container is swingable by the tipping cylinder. In such a tipper the bar of the invention functions as the pivot and the pressure prevailing in the tipping cylinder is also measured and fed to the analyser and combined with the readings from the strain gauges. In non-tipping vehicles two weighing devices according to the invention may be fitted one at each end of the platform or load containing portion. The signals from these may be shown separately or may be combined to provide a total load reading. The analyser may be programmed with the tare weight of the load-containing portion and arranged to subtract this weight from the weight detected so that the truexweight of the load is shown in intelligible form. The intelligible form may take the form of a dial reading or of a digital read out or may provide a print out of the weight measured. The device may be arranged to operate continuously in conjunction with the tachometer record in the vehicle so that any change which may take place in the loading of the vehicle during the journey of the vehicle will be noted and the place where the change took place will be ascertainable.
The analyser unit in a device of the invention constructed as a weighbridge may incorporate means for receiving at least one coin or a card bearing means to provide an electronic signal to the analyser so that the analyser will only be operative to show the weight when at least one coin is inserted or an operating card is inserted into an appropriate coin or card-receiving position in the analyser.
Practical embodiments of the invention are illustrated in the accompanying semi-diagrammatic drawings in which Figs. 1 to 5 show the device constructed as a weighbridge. In these drawings Fig. 1 shows a weighbridge in side elevation, Fig. 2 is a section through the line 2-2 in Fig. 1, Fig. 3 is a plan view of the weighbridge with a portion of the upper cover plate cut away to show the construction of the deflection bars more clearly, Fig. 4 is a view to a larger scale of the section of Fig. 2 and Fig. 5 is a view looking in the direction 5- 5 in Fig. 4. Fig. 6 is a plan view of one form of the device intended to be used as one of a pair of devices arranged parallel with one another and spaced appropriately. Fig. 7 is a view corresponding with Fig. 2 showing an alternative construction, the device being shown arranged for the weighing of railway vehicles.
In the drawings 1 and 2 denote pairs of supports in the form of pedestals (Figs. 1-6) or transverse bars (Fig. 7) spaced from one another and resting on a firm base 3. 4 denotes deflection bars supported on the supports in Figs. 2 and 4 penetrating holes in upwardly extending plates 1 A and 2A presented by the pedestals so that the deflection bars can swing about the fulcrum points presented by the plates 1 A, 2A. Spherical bearings may be employed at the support points.
5 denotes a load supporting platform formed of a frame 6 to which is attached an upper cover plate 7. The load supporting platform 5 presents load-applying members 8 which rest on the deflection bars 4. 9 and 10 denote strain gauges attached respectively to the supporting bars above and below the neutral axis of the deflection bars 4, the strain gauges 9 and 10 being connected to an analyser device 11 arranged to analyse and present the signals it receives from the strain gauges 9 and 10 as an intelligible signal of the load corresponding to the strains detected by the strain gauges 9 and 10.
In practice, when a vehicle is driven on to the load supporting platform 5 the weight of the vehicle is transmitted by the load-applying members 8 to the ends of the deflection bars 4. The loads on the ends of the bars cause the portions of the bars between the pairs of pedestals 1 and 2 to deflect upwardly (Figs. 2 and 3) or downwardly (Fig. 7) about the fulcra presented by the supports 1 and 2. The deflection of the bars 4 causes the portions of the bars on one side of the neutral axis to be correspondingly strained in one sense (tensile or compressive) and the portions of the bars on the other side of the neutral axis to be strained in the opposite sense (compressive or tensile).The analyser receives signals from the strain gauges 9 and 10 and is programmed to interpret these signals taking into account the modulus of elasticity of the material of the deflection bars and their dimensions to arrive at the load which causes the particular deflection to take place. The analyser device then indicates this load either visually and/or by issuing a print out. The analyser device is also programmed to make allowance for the weight of the platform resting on the deflection bars so that the true weight of the vehicle resting on the platform is indicated. The analyser device 11 is also arranged to sum the results from the two deflection bars so that irrespective of the positions of a vehicle on the platform the true total weight of the vehicle is still indicated.In the construction of Fig. 6 employing two parallel devices the analyser may be arranged to indicate the total weight of the vehicle or to indicate the separate weight borne by the wheels on opposite sides of the vehicle thereby indicating if the vehicle is asymmetrically loaded. The construction of Fig.
7 requires the minimum amount of excavation to accommodate the weighbridge.
Figs. 8, 9 and 10 show the device as fitted to a vehicle. In these drawings Fig. 8 shows a tipper vehicle fitted with one embodiment of the device of the invention, Fig. 9 is a rear view of the vehicle and Fig. 10 shows the portion ringed in Fig. 9 to an enlarged scale.
Fig. 11 shows an alternative arrangement of the strain gauges on the deflection bar.
In the drawings 11 denotes the chassis of the vehicle, 12 denotes the tipper portion, i.e.
the load-carrying container of the vehicle and 13 denotes the vehicle cab. The tipper portion
12 is supported at the forward end by a hydraulic cylinder and piston device 14 and at the rear end on a pivot 15. The pivot 15 comprises a supporting bar constituting the deflection bar formed of three sections 15A, 15B and 15C arranged in line.The sections
15A and 15C are end sections and the section 15B is a centre section. 16 denotes flanges by which the bar sections 15A, 15B and 15C are connected to one another in alignment. 17 denotes supporting means constituting load-applying members by which the tipper portion 2 is supported on the sections
15A and 15C of the bar 15 at points near their outer ends and 18 denotes supports located near the outer ends of the sections 15A and 15C by which the bar 15 is connected to the chassis 11. 19 denotes a strain gauge attached to the centre section 15B above the neutral axis of the bar and 20 denotes a strain gauge attached to the centre section 5B below the neutral axis of the bar 5. 21 denotes connecting leads connecting the strain gauges 19 and 20 to an analyser and read out device 22 fitted in the cab 13 of the vehicle. 23 denotes a connection from the hydraulic cylinder and piston device 14 to the analyser to convey a reading of the pressure in the cylinder of the device 14 to the analyser. In Fig. 11 the strain gauges 19 and 20 are duplicated with one set at each end of the bar 15.
In practice, when the tipper portion 12 is loaded the load supported by the hydraulic cylinder and piston device 14 is indicated as a pressure signal by way of the connection 23 to the analyser and read out device 22. The portion of the load supported by the bar 15 causes the bar 15 to deflect.
In deflecting, the strain gauge 19 shows the tensile strain at the top of the bar section 15B and the strain gauge 20 shows the compressive strain at the bottom of the bar section 15B. These two signals conveyed to the analyser are used by the analyser in conjunction with the information stored in the analyser memory relating to the physical characteristics of the bar 15 to make a calculation of the load applied to the bar 15. This signal is converted by the analyser into a signal of load on the bar 15 and is either displayed or recorded by itself or along with a display or a record of the load of the device 14 or is combined with that load to give the total load of the tipper portion 12 of the vehicle.The unladen weight is subtracted from the weight measured so that only the load carried by the tipper portion 12 is displayed or recorded directly within the vehicle cab. Since it is the weight of the tipper portion only which is measured the weight of the driver and the weight of the fuel carried do not appear in the figure displayed or recorded and no allowance need be made for these. In the construction of Fig. 11 the strain gauges at opposite ends of the bar 15 may be so connected to the analyser that they show the proportion of the weight of the vehicle applied at opposite ends of the bar thereby showing if the vehicle is asymmetrically loaded.
It may be made clear that separate strain gauges may be fitted to opposite ends of the deflection bars in the weighbridge construction with the object of providing some indication that a vehicle resting on the weighbridge is asymmetrically loaded.
Claims (13)
1. A weight-sensing device characterized by incorporating at least one deflection bar supported at two points longitudinally spaced along the bar, two load-applying members mounted on the deflection bar at points longitudinally spaced along the bar from the points where the bar is supported, strain gauges attached to the deflection bar at points above and below the neutral axis of the bar and arranged to issue strain signals indicating the amount of strain detected and an analyser device operatively connected to the strain gauges to receive the strain signals therefrom, analyse said signals using information previously stored in the analyser relating to the physical dimensions of the device and the characteristics of the material of the deflection bar and convert them into terms of the live load on the load-applying members and show said load in an intelligible form.
2. A weight-sensing device according to claim 1 characterized in that the support points are presented by vertical members incorporating upwardly extending plates through which the deflection bar projects so that the plates act as fulcra for the bar.
3. A weight-sensing device according to claim 1 characterized in that the support points are constituted by the contact points of the deflection bar with other bars transverse to the deflection bar and on which the deflection bar rests.
4. A weight-sensing device according to claim 1 characterized in that the deflection bar is a single bar in the form of an H beam with the web arranged in a vertical plane, one strain gauge being attached to the upper flange and the other strain gauge being attached to the lower flange.
5. A weight-sensing device according to claim 1 characterized in that the deflection bar comprises two parallel bar components spaced from one another in a vertical direction and rigidly attached to one another at their ends, one strain gauge being attached to the upper bar component and the other strain gauge being attached to the lower bar component.
6. A weight-sensing device according to claim 1 characterized in that the deflection bar is formed of three sections connected to one another in line so that the bar is formed of a centre section and two end sections.
7. A weight-sensing device according to claim 6 characterized in that the centre section of the bar has a different cross sectional shape from the cross sectional shape of the end sections of the bar.
8. A weight sensing device according to claim 1, characterized in that at least two pairs of strain gauges are fitted to the bar at spaced points on the bar, the analyser being arranged to combine the signalssfrom the individual pairs of strain gauges and use them to calculate the load on the bar or to treat the signals separately.
9. A weight-sensing device characterized in that it is arranged as a weighbridge incorporating two weight sensing units each unit incorporating at least one weight-sensing device according to claim 1, the two units being disposed with their deflection bars parallel with one another and spaced from one another, said two units being interconnected by a platform connected to the load members of the weight-sensing devices, said platform being arranged to receive a vehicle to be weighed.
10. A weight-sensing device according to claim 9 characterized in that one analyser is arranged to receive the signals from all the strain gauges and provide an indication of the total weight of the vehicle.
11. A weight-sensing device according to claim 9 characterized in that each unit comprises two weight-sensing devices each according to claim 1, the two units being arranged in side by side parallel relationship.
12. A weight-sensing device according to claim 1 fitted to a tipping vehicle characterized in that the deflection bar constitutes the pivot bar about which tipping action takes place.
13. A weight-sensing-device according to claim 1 characterized in that the support points are constituted by vertical members connected at their lower ends to the chassis of a vehicle to which the device is fitted.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB868612426A GB8612426D0 (en) | 1986-05-22 | 1986-05-22 | Weight measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8712136D0 GB8712136D0 (en) | 1987-06-24 |
| GB2191867A true GB2191867A (en) | 1987-12-23 |
Family
ID=10598246
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB868612426A Pending GB8612426D0 (en) | 1986-05-22 | 1986-05-22 | Weight measuring device |
| GB08712136A Withdrawn GB2191867A (en) | 1986-05-22 | 1987-05-22 | Weight measuring device for vehicles |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB868612426A Pending GB8612426D0 (en) | 1986-05-22 | 1986-05-22 | Weight measuring device |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB8612426D0 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107290105A (en) * | 2016-07-09 | 2017-10-24 | 天津华北衡器有限公司 | Container static state unbalance loading detection method |
| CN110296792A (en) * | 2019-05-17 | 2019-10-01 | 中国铁路成都局集团有限公司计量所 | A kind of method of freight container unbalance loading calibration |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1096786A (en) * | 1964-02-13 | 1967-12-29 | Anselme Marie Jean Bellier | Improvements in/or relating to a system for weighing loads while in motion |
| US4095660A (en) * | 1975-09-18 | 1978-06-20 | Kurt Eilert Johansson | Roller |
| EP0223384A1 (en) * | 1985-10-05 | 1987-05-27 | Manterfield, Kenneth Charles | A vehicle load monitoring system |
| GB2184852A (en) * | 1985-12-19 | 1987-07-01 | Sharp Kk | Foldable weighing scale |
-
1986
- 1986-05-22 GB GB868612426A patent/GB8612426D0/en active Pending
-
1987
- 1987-05-22 GB GB08712136A patent/GB2191867A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1096786A (en) * | 1964-02-13 | 1967-12-29 | Anselme Marie Jean Bellier | Improvements in/or relating to a system for weighing loads while in motion |
| US4095660A (en) * | 1975-09-18 | 1978-06-20 | Kurt Eilert Johansson | Roller |
| EP0223384A1 (en) * | 1985-10-05 | 1987-05-27 | Manterfield, Kenneth Charles | A vehicle load monitoring system |
| GB2184852A (en) * | 1985-12-19 | 1987-07-01 | Sharp Kk | Foldable weighing scale |
Non-Patent Citations (2)
| Title |
|---|
| WO A1 85/01796 * |
| WO A1 86/00700 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107290105A (en) * | 2016-07-09 | 2017-10-24 | 天津华北衡器有限公司 | Container static state unbalance loading detection method |
| CN110296792A (en) * | 2019-05-17 | 2019-10-01 | 中国铁路成都局集团有限公司计量所 | A kind of method of freight container unbalance loading calibration |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8612426D0 (en) | 1986-07-02 |
| GB8712136D0 (en) | 1987-06-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |