Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
  • G01F17/00—Methods or apparatus for determining the capacity of containers or cavities, or the volume of solid bodies

Definitions

• the solid volume, not the weight, of the timber is used as a measure for determining the price of delivered timber, for example when logs are delivered to sawmills.
• the measuring of the solid volume of such logs which are usually transported to the sawmill by vehicles on wheels, is, in actual practice, carried out by experienced tallymen who, with the aid of mechanical measuring tools and, possibly, arithmetical tables, esti ⁇ mate the solid biomass content of the load received at the sawmill- This estimate is, however, often rather uncertain and may differ by as much as 10-15% from the actual value. From the economic point of view, this is, of course, unsa ⁇ tisfactory to both suppliers and buyers, as the value of each load of timber may run to considerable amounts of money.
• Technical field of the invention is, in actual practice, carried out by experienced tallymen who, with the aid of mechanical measuring tools and, possibly, arithmetical tables, esti ⁇ mate the solid biomass content of the load received at the sawmill- This estimate is, however, often rather uncertain and may differ by as
• the present invention aims at providing simple and exact measuring of the solid volume of vehicle loads, such as loads of timber, by means of a method which comprises the steps of introducing the load into a compartment which is hermetically sealable against the ambient atmosphere and located in a housing into which is gradually intro ⁇ quizd a fill-out means intended to reduce the volume, and thus increase the pressure, of the gas in said compart ⁇ ment; determining, after at least a certain excess pres- sure in said compartment has been established, the product of gas volume and gas pressure as a first reference value; and measuring the solid volume of the load as the differ ⁇ ence between said first reference value and a second re ⁇ ference value of the product of gas volume and gas pres- sure, determined under identical conditions, but with no load in said compartment.
• DE-B- 1,923,683 relates to a method of measuring in which a la- boratory sample is put into a can which, preparatory to measuring, is sealed by means of a lid.
• the object to be measured is a liquid which is pumped into a sealable tank, while in FR-A-1,480,470 the object to be measured is an injured foot which is put into a casing especially designed for this purpose.
• the present invention aims at applying the teaching of Boyle's law to the measuring of the solid volume of loads of timber and the like, thereby to obtain a far higher measuring accuracy. According to the distinctive features of the invention, this is achieved in that the load is introduced into the housing on a goods vehicle through a hermetically sealable gate of the housing, that the load is left on said vehicle while the first reference value is being determined, and that the vehicle is then removed from the housing through a hermetically sealable gate.
• the invention also relates to an apparatus for measuring the solid volume of loads of timber or the like, the distinctive features of the apparatus being defined in the appended claim 3.
• the housing is elongate and has, at two opposite ends, hermetically sealable gates.
• the vehicle carrying the load can be driven in through one gate and out through the other.
• SU 1,137,315 intimates that gas pressure measuring could be used for measuring the volume of round timber, but does not explain how this is done in actual practice.
• the technique referred to in this document seems to be on a laboratory scale only in that no means of the type re ⁇ quired in the present invention are disclosed. Further ⁇ more, the-method of SU 1,137,315 is not based on the con ⁇ cept of determining two different reference values for the product of gas volume and gas pressure after a certain excess pressure has been established in the measuring com ⁇ partment.
• Fig. 1 is a schematic longitudinal section of an appa ⁇ ratus according to the invention
• Fig. 2 is a longitudinal section of the same apparatus into which a vehicle with a load has been driven
• Fig. 3 is a similar longitudinal section showing the ve- hicle without any load
• Fig. 4 is a cross-section of an apparatus according to an alternative embodiment of the invention
• Fig. 5 is a similar cross-section of the apparatus into which a vehicle with a load has been driven
• Fig. 6 is a similar cross-section showing the vehicle without any load
• Fig. 7 is a schematic perspective view of a hermetically sealable gate of the apparatus.
• the apparatus shown in Figs 1-3 comprises a housing generally designated 1 and defining a compartment 2 which is hermetically sealable against the ambient atmosphere.
• the housing 1 is elongate and has gates 3,3' at its two opposite short sides. These gates may ad- vantageously be constructed in the manner shown in Fig. 7.
• a panel 4 serving as a fill-out means is attached to the ceiling of the housing 1 and connected with a rectangular bellows 5 extending along the edge portions of the panel.
• the bellows 5 can expand vertically, while maintaining a gastight separation between the compartment 2 and the out ⁇ side of the housing.
• the panel 4 can be raised and lowered by means of hydraulic cylinders or similar power generat ⁇ ing means 6.
• the apparatus comprises a means 7 adapted to measure the gas pressure inside the compart ⁇ ment 2 and, in practice, connectible to a computer 7' for recording the measurement results.
• a vehicle is generally designated 8 and consists, in this example, of a logging truck.
• the load on the vehicle is generally designated 9 and may, in actual practice, be made up of stacks or bundles of logs, in par ⁇ ticular logs of saw timber.
• the vehicle 8 with the load 9 is driven into the housing 1, whereupon the two gates 3,3' are shut, such that the compartment 2 is hermetically sealed against the ambient atmosphere.
• the panel 4 is lowered from the ceiling by means of the hydraulic cylinders 6, such that the panel and the bellows 5 gradually reduce the volume of air in the compartment 2, and a certain excess pressure in relation to the atmospheric pressure is ob ⁇ tained in said compartment.
• the panel 4 When the desired excess pres- sure has been established, the panel 4 is stopped in a given position, and the air pressure in the compartment is measured and recorded by means of the computer 7,7'. Then, the vehicle is driven out and the load 9 discharged, whereupon the vehicle is again driven into the housing (see Fig. 3), and the gates 3,3' are closed. At this point, the panel 4 has been retracted to its initial posi ⁇ tion shown in Fig. 1. In a repeated measuring process, the panel 4 is lowered to the same position as in Fig. 2, and the gas pressure is then measured. Since there is no load on the vehicle, the air pressure in the compartment will be lower than in the measuring according to Fig. 2, the difference in air pressure between the state in Fig. 2 and the state in Fig. 3 being a measure of the solid volume of the load 9.
• Fig. 7 shows how the gate 3 may form a bellows-shaped boundary wall 10 which, along an upper edge, is attached to an inclined, stationary frame 11 connected in airtight fashion to the ceiling and walls of the housing 1, and the lower edge of which is connected to a pivotable frame 12 which wholly or partly can be immersed in a liquid bath 13 in a trough 14.
• the liquid bath not only provides, in a simple and reliable fashion, a gastight sealing of the boundary wall 10, but also cleans the wheels of the ve ⁇ hicle when these pass through said bath.
• FIGs 4-6 show an embodiment in which a liquid is used as fill-out means, a storage container 15 being dis ⁇ posed outside the compartment 2 and containing a liquid 18, such as water, which can be supplied to and discharged from a trough 17 inside said compartment via a pump 16.
• a liquid 18 such as water
• a pump 16 By pumping liquid 18 from the container 15 into the trough 17, after having sealed the compartment 2 as described above, an excess pressure of the air in the compartment 2 can be established, and this pressure can be measured by a means 7 in the manner described above.
• the hous ⁇ ing As shown in the drawings, with hermetically sealable gates at each one of two opposite ends of said housing which suitably is elongate with the gates situated at the two short sides of the housing.
• the hous ⁇ ing with two gates has a length, width and height only slightly exceeding the corresponding dimensions of the ve ⁇ hicle, such that the volume of the housing is minimal in relation to the size of the vehicle, thus ensuring speedy measuring operations.

Landscapes

• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• General Physics & Mathematics (AREA)
• Measuring Fluid Pressure (AREA)
• Air Bags (AREA)
• Force Measurement Appropriate To Specific Purposes (AREA)
• Body Structure For Vehicles (AREA)
• Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
• Crystals, And After-Treatments Of Crystals (AREA)
• Loading Or Unloading Of Vehicles (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20373968

Family Applications (1)

Country Status (9)

Cited By (1)

Families Citing this family (5)

Citations (5)

Family Cites Families (2)

• 1988
  • 1988-11-17 SE SE8804149A patent/SE467021B/sv not_active IP Right Cessation
• 1989
  • 1989-11-16 US US07/689,782 patent/US5231873A/en not_active Expired - Lifetime
  • 1989-11-16 DE DE3991373A patent/DE3991373C2/de not_active Expired - Fee Related
  • 1989-11-16 DE DE19893991373 patent/DE3991373T/de active Pending
  • 1989-11-16 WO PCT/SE1989/000663 patent/WO1990005896A1/en active IP Right Grant
  • 1989-11-16 AU AU45117/89A patent/AU4511789A/en not_active Abandoned
• 1991
  • 1991-05-16 NO NO911929A patent/NO175796C/no not_active IP Right Cessation
  • 1991-05-17 FI FI912410A patent/FI97570C/sv active
  • 1991-05-17 RU SU4895663/10A patent/RU2037786C1/ru not_active IP Right Cessation
• 1993
  • 1993-12-21 LV LVP-93-1357A patent/LV11377B/lv unknown

Patent Citations (5)

Non-Patent Citations (1)

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