EP0675231B1 - Method and device for spreading of salt slurry - Google Patents

Method and device for spreading of salt slurry Download PDF

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Publication number
EP0675231B1
EP0675231B1 EP95850067A EP95850067A EP0675231B1 EP 0675231 B1 EP0675231 B1 EP 0675231B1 EP 95850067 A EP95850067 A EP 95850067A EP 95850067 A EP95850067 A EP 95850067A EP 0675231 B1 EP0675231 B1 EP 0675231B1
Authority
EP
European Patent Office
Prior art keywords
salt
rotors
tube
blades
water
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.)
Expired - Lifetime
Application number
EP95850067A
Other languages
German (de)
French (fr)
Other versions
EP0675231A1 (en
Inventor
Christer Friggeraker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Friggerakers Verkstader AB
Original Assignee
Friggerakers Verkstader AB
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Filing date
Publication date
Application filed by Friggerakers Verkstader AB filed Critical Friggerakers Verkstader AB
Publication of EP0675231A1 publication Critical patent/EP0675231A1/en
Application granted granted Critical
Publication of EP0675231B1 publication Critical patent/EP0675231B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
    • E01H10/00—Improving gripping of ice-bound or other slippery traffic surfaces, e.g. using gritting or thawing materials ; Roadside storage of gritting or solid thawing materials; Permanently installed devices for applying gritting or thawing materials; Mobile apparatus specially adapted for treating wintry roads by applying liquid, semi-liquid or granular materials
    • E01H10/007—Mobile apparatus specially adapted for preparing or applying liquid or semi-liquid thawing material or spreading granular material on wintry roads

Definitions

  • the present invention relates to a method and device for spreading of salt slurry.
  • Salt in various conditions is spread on the road lanes in order to dissolve ice and prevent skidding.
  • the salt can be in the form of solid or a more or less coarse-grained powder or dissolved or slurried in water. Saturated solutions of salt are only used on special occasions and use of dry salt or salt in slurries is more common. Salt slurries are generally more efficient than dry salt as it penetrates the surface faster and not like dry salt i.e. may be blown away from the road.
  • Salt slurries primarily means salt substantially comprising sodium chloride and/or other substances which are included in the designation road salt and which are mixed with an amount of water which is less than what is required to make all of the salt become dissolved.
  • a device for spreading moist material is disclosed in US-A-3420451.
  • the device includes feeders to feed material into a vertical pipe through which it falls onto a rotor comprising radial throwing blades which seize and eject the spreading material.
  • An agitator may be provided on the rotating shaft of the throwing rotor, said agitator projecting into the supply pipe, its wings distributing the spreading material uniformly over the throwing rotor.
  • the present invention relates to a new method for spreading of salt slurry.
  • the invention also concerns a device for performing the method, whereby the salt slurry is produced in immediate connection with the spreading.
  • Figure 1 shows a complete equipment for producing and spreading of salt slurry using the method and device according to the invention.
  • Figure 2 shows part of the device of figure 1 more in detail.
  • Figures 3 and 4 show the device of the invention from the side and from above.
  • FIGS 5 and 6 show another embodiment of the invention from the side and from above.
  • the device shown in figure 1 comprises a container 12 for salt and a tank 13 for water or solution of salt.
  • Water and salt is delivered to a device enclosed in a tube 4, wherein the slurry is produced.
  • the tube 4 is essentially vertical which in practice means that it deviates not more than 25° from a vertical line as by greater deviations there are problems with the conveyance of material through the tube. Thereupon the slurry falls down onto a spreader disc 15 from which it is spread over the road.
  • the complete device when used is intended to be placed on a suitable transportation vehicle.
  • Salt and water are supplied to the tube 4 from the top by a feeding screw 11 for salt and a tube 9 for water having a spreader disc 10 at its end. Thereafter, salt and water fall down through the tube to a device comprising two rotors made as fans 1 and 2.
  • fans is a device which has several blades or wings 1 a-d, 2 a-d mounted to a shaft 3. The blades extend from the shaft all the way outwards close to the inside of the tube.
  • the denomination fan aims at the appearance of the device.
  • the rotating fan shall not cause a flow of air in the direction of the shaft 3.
  • the fans are driven by a motor 5, suitably a hydraulic motor, and are directed opposite each other, i.e. so arranged that the flow of air which results from the rotation is nil or very small.
  • the fans are mounted onto a common shaft 3.
  • the blades of the fans are immovably mounted to the shaft and thus always rotate at the same speed and at the same direction.
  • the blades of the fans comprise flat surfaces which are somewhat oblique relative to the shaft and arranged so that the upper fan 1 alone would cause a flow of air directed in opposite direction to the flow of air from the lower fan 2.
  • the fans rotate at high speed which means that the salt particles hit the blades of the fans and are broken thereby.
  • the speed of rotation is based upon a desire to obtain a specific maximum particle size. It has also been found that the water shall be supplied before the fans and pass through them together with the salt as problems will otherwise occur with particles of salt that adhere to and form lumps on the blades of the fans.
  • the so obtained slurry falls via a funnel or duct 6 onto a conventional spreader including a spreader disc 15 with several blades 7.
  • the spreader disc is mounted onto a shaft 8 which is driven by a motor that can be controlled to the desired rotational speed.
  • the fan device can be made in many different ways.
  • the device as shown in figures 3 and 4 has two sets of fan blades 1, 2 on a common shaft.
  • the blades of the fans may also be mounted onto two different concentric shafts which rotate in opposite directions where all of the blades are angled in the same direction.
  • the speed of the rotors varies depending upon the other design features. However, there is a certain lowest speed at the outer ends of the blades close to the tube walls which is required and at a tube diameter of 200 mm the speed of rotation shall be not less than 1500 rpm, preferably about 2000 rpm.
  • FIG. 5 Another embodiment of the invention is shown in figures 5 and 6, wherein the blades of the fans have been substituted for by chain links 15, 16, 17, 18. In many cases this design further reduces the formation of lumps and adhering layers on the rotors. Nor do the chain links cause a vertical flow of air.

Abstract

The present invention relates to a method for spreading of salt slurry and a device for making such slurry. Salt and water are supplied to the tube 4 from the top by a feeding screw 11 for salt and a tube 9 for water having a spreader disc 10 at its end. Thereafter, salt and water fall down through the tube to a device comprising two rotors 1 and 2. The rotors are driven by a motor 5, suitably a hydraulic motor, and rotate at high speed which means that the salt particles hit the rotors and are broken thereby. <IMAGE>

Description

  • The present invention relates to a method and device for spreading of salt slurry.
  • Salt in various conditions is spread on the road lanes in order to dissolve ice and prevent skidding. The salt can be in the form of solid or a more or less coarse-grained powder or dissolved or slurried in water. Saturated solutions of salt are only used on special occasions and use of dry salt or salt in slurries is more common. Salt slurries are generally more efficient than dry salt as it penetrates the surface faster and not like dry salt i.e. may be blown away from the road.
  • Salt slurries primarily means salt substantially comprising sodium chloride and/or other substances which are included in the designation road salt and which are mixed with an amount of water which is less than what is required to make all of the salt become dissolved.
  • The various means and methods for spreading of salts set various requirements on the equipment used. As a rule, different equipments must be used for the different ways of spreading, which brings with it large investments. There are also difficulties, especially by preparing and using salt slurries, which appear as formation of lumps, blocking and adhesion into and onto the equipment.
  • A device for spreading moist material is disclosed in US-A-3420451. The device includes feeders to feed material into a vertical pipe through which it falls onto a rotor comprising radial throwing blades which seize and eject the spreading material. An agitator may be provided on the rotating shaft of the throwing rotor, said agitator projecting into the supply pipe, its wings distributing the spreading material uniformly over the throwing rotor.
  • The present invention relates to a new method for spreading of salt slurry. The invention also concerns a device for performing the method, whereby the salt slurry is produced in immediate connection with the spreading.
  • The invention will below be described more in detail with reference to the enclosed figures.
  • Figure 1 shows a complete equipment for producing and spreading of salt slurry using the method and device according to the invention.
  • Figure 2 shows part of the device of figure 1 more in detail.
  • Figures 3 and 4 show the device of the invention from the side and from above.
  • Figures 5 and 6 show another embodiment of the invention from the side and from above.
  • The device shown in figure 1 comprises a container 12 for salt and a tank 13 for water or solution of salt. Water and salt is delivered to a device enclosed in a tube 4, wherein the slurry is produced. The tube 4 is essentially vertical which in practice means that it deviates not more than 25° from a vertical line as by greater deviations there are problems with the conveyance of material through the tube. Thereupon the slurry falls down onto a spreader disc 15 from which it is spread over the road. The complete device when used is intended to be placed on a suitable transportation vehicle.
  • In the figures 3 and 5 half of the tube 4 has been removed to show the arrangements inside the tube.
  • Salt and water are supplied to the tube 4 from the top by a feeding screw 11 for salt and a tube 9 for water having a spreader disc 10 at its end. Thereafter, salt and water fall down through the tube to a device comprising two rotors made as fans 1 and 2. What is here named fans is a device which has several blades or wings 1 a-d, 2 a-d mounted to a shaft 3. The blades extend from the shaft all the way outwards close to the inside of the tube. The denomination fan aims at the appearance of the device. However, the rotating fan shall not cause a flow of air in the direction of the shaft 3. The fans are driven by a motor 5, suitably a hydraulic motor, and are directed opposite each other, i.e. so arranged that the flow of air which results from the rotation is nil or very small.
  • In the embodiment of the invention as shown in the figures, the fans are mounted onto a common shaft 3. The blades of the fans are immovably mounted to the shaft and thus always rotate at the same speed and at the same direction. The blades of the fans comprise flat surfaces which are somewhat oblique relative to the shaft and arranged so that the upper fan 1 alone would cause a flow of air directed in opposite direction to the flow of air from the lower fan 2. The fans rotate at high speed which means that the salt particles hit the blades of the fans and are broken thereby. The speed of rotation is based upon a desire to obtain a specific maximum particle size. It has also been found that the water shall be supplied before the fans and pass through them together with the salt as problems will otherwise occur with particles of salt that adhere to and form lumps on the blades of the fans.
  • From the fans the so obtained slurry falls via a funnel or duct 6 onto a conventional spreader including a spreader disc 15 with several blades 7. The spreader disc is mounted onto a shaft 8 which is driven by a motor that can be controlled to the desired rotational speed.
  • The fan device can be made in many different ways. The device as shown in figures 3 and 4 has two sets of fan blades 1, 2 on a common shaft. The blades of the fans may also be mounted onto two different concentric shafts which rotate in opposite directions where all of the blades are angled in the same direction.
  • It is essential that there is no or very little vertical air flow generated by the fans.
  • The speed of the rotors varies depending upon the other design features. However, there is a certain lowest speed at the outer ends of the blades close to the tube walls which is required and at a tube diameter of 200 mm the speed of rotation shall be not less than 1500 rpm, preferably about 2000 rpm.
  • Another embodiment of the invention is shown in figures 5 and 6, wherein the blades of the fans have been substituted for by chain links 15, 16, 17, 18. In many cases this design further reduces the formation of lumps and adhering layers on the rotors. Nor do the chain links cause a vertical flow of air.

Claims (9)

  1. Method for spreading of salt slurry, whereby salt particles and liquid are continuously supplied from above into an essentially vertical tube (4), wherein are arranged rotor (1,2) which rotate at a high speed and through which salt and liquid pass together, so that the salt particles are broken by the rotors (1, 2), characterized in that the rotors (1, 2) are two identical oppositely directed fans (1a-d, 2a-d) so that the resulting flow of air from the rotors (1, 2) in the longitudinal direction of the tube (4) is nil or very small.
  2. Method according to claim 1, characterized in that the amount of salt supplied is greater than the amount which corresponds to the solubility of the salt in the liquid supplied at the same time.
  3. Method according to any of the preceding claims, characterized in that the liquid is water.
  4. Method according to any of the preceding claims, characterized in that the liquid is a solution of salt in water.
  5. Device for spreading of salt slurry, comprising a vertical tube (4), wherein are arranged rotors (1, 2) along a vertical shaft (3), and arrangements (11, 9) to separately supply from above salt particles and water so that they will together pass through the rotors (1, 2), characterized in that the rotors (1, 2) are two identical oppositely directed fans having several blades (1 a-d, 2 a-d), which upon rotation generate nil or very small flow of air in the longitudinal direction of the tube (4).
  6. Device according to claim 5, characterized in that the fan blades (1a-d, 2a-d) are permanently mounted onto the same shaft (3).
  7. Device according to claim 5 or 6, characterized in that the fan blades (1a-d, 2 a-d) are made as flat sheets.
  8. Device according to any of the claims 5-7, characterized in that the blades (1a-d, 2a-d) of the fans are oblique relative to the shaft (3).
  9. Device according to claim 5, characterized in that the rotor blades are chains or individual chain links.
EP95850067A 1994-03-28 1995-03-27 Method and device for spreading of salt slurry Expired - Lifetime EP0675231B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9401054 1994-03-28
SE9401054A SE501524C2 (en) 1994-03-28 1994-03-28 Methods and apparatus for spreading salt slurry

Publications (2)

Publication Number Publication Date
EP0675231A1 EP0675231A1 (en) 1995-10-04
EP0675231B1 true EP0675231B1 (en) 1999-03-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP95850067A Expired - Lifetime EP0675231B1 (en) 1994-03-28 1995-03-27 Method and device for spreading of salt slurry

Country Status (7)

Country Link
EP (1) EP0675231B1 (en)
AT (1) ATE177165T1 (en)
DE (1) DE69507973T2 (en)
DK (1) DK0675231T3 (en)
FI (1) FI109928B (en)
NO (1) NO304195B1 (en)
SE (1) SE501524C2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002042184A1 (en) 2000-11-23 2002-05-30 Schmidt Holding Gmbh Dispersing appliance
DE10157160A1 (en) * 2001-08-30 2003-04-03 Anton Lindner Apparatus, for wetting granular or powdery scattering material, comprises belts for transporting material, and silos for storing material to be moistened, with liquid sprays on housing surfaces
DE10328913B3 (en) * 2003-06-26 2005-03-24 Schmidt Holding Gmbh spreader

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1459727B1 (en) * 1964-08-25 1970-10-15 Anton Karlbacher Mobile device for spreading grit on roads or the like.
DE3035360C2 (en) * 1980-09-19 1982-12-30 Willy 7715 Bräunlingen Küpper Spreading vehicle with spreading devices for granulated and liquid thawing substances
DE3420694A1 (en) * 1984-06-02 1985-12-05 Max Pietsch KG GmbH & Co, 3014 Laatzen Spreading vehicle for winter service
DE3937675A1 (en) * 1989-11-13 1991-05-23 Kuepper Weisser Gmbh SPREADING DEVICE FOR SPREADING MOISTURIZED GRANULATES

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002042184A1 (en) 2000-11-23 2002-05-30 Schmidt Holding Gmbh Dispersing appliance
DE10058073A1 (en) * 2000-11-23 2002-06-06 Schmidt Holding Gmbh spreader
DE10058073C2 (en) * 2000-11-23 2002-11-07 Schmidt Holding Gmbh spreader
DE10157160A1 (en) * 2001-08-30 2003-04-03 Anton Lindner Apparatus, for wetting granular or powdery scattering material, comprises belts for transporting material, and silos for storing material to be moistened, with liquid sprays on housing surfaces
DE10328913B3 (en) * 2003-06-26 2005-03-24 Schmidt Holding Gmbh spreader

Also Published As

Publication number Publication date
FI951437A0 (en) 1995-03-27
NO304195B1 (en) 1998-11-09
EP0675231A1 (en) 1995-10-04
DE69507973D1 (en) 1999-04-08
SE9401054D0 (en) 1994-03-28
ATE177165T1 (en) 1999-03-15
NO951177L (en) 1995-09-29
SE9401054L (en) 1995-03-06
FI109928B (en) 2002-10-31
FI951437A (en) 1995-09-29
NO951177D0 (en) 1995-03-27
DK0675231T3 (en) 1999-10-04
DE69507973T2 (en) 1999-09-16
SE501524C2 (en) 1995-03-06

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