Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
  • B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
  • B26D3/16—Cutting rods or tubes transversely
  • B26D3/164—Cutting rods or tubes transversely characterised by means for supporting the tube from the inside
  • B26D3/165—Cutting rods or tubes transversely characterised by means for supporting the tube from the inside by fluid under pressure
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
  • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
  • B26D7/06—Arrangements for feeding or delivering work of other than sheet, web, or filamentary form
  • B26D7/0683—Arrangements for feeding or delivering work of other than sheet, web, or filamentary form specially adapted for elongated articles

Definitions

• the present invention relates to a cutting device for cutting hoses, preferably reinforced hydraulic hoses
• the invention likewise relates to a hose cutting method.
• Another prior-art method of hose cleaning is to propel a plug of foam rubber through the hose cavity. It has been found that the foam-rubber plug has a tendency to spread the dust and the residual particles on the faces of the hose itself without removing them as desired.
• Patent Specification SE502864 discloses a method of cutting hoses by means of insertion into the hose of a plug of a special design to a position, where the cutting is intended to be carried out. The plug is then severed essentially at its centre into two parts in conjunction with the hose being cut at the desired place.
• the suggested hose-cutting method with the aid of a plug designed for that purpose has the advantage of protecting the inner jacket face of the hose from particles and chips.
• the patent specification discloses one way of forcing the plug to the desired position inside an unrestrained hose by means of a rodlike tool.
• the rod-like tool is pulled out of the hose.
• the position of the inserted plug coincides with the length of the rod part that has been introduced into the hose and that rod part is now placed alongside the external face of the hose, to thus allow the position of the plug from the hose end to be determined.
• the hoses are opaque, there is no possibility, however, of verifying by ocular means that the plug actually still occupies the intended position, when the hose, in the following sequence, is moved up to the cutting means to be severed.
• the frictional resistance encountered as the plug is being inserted into the hose causes further problems of placing the plug in the correct position.
• the possibility of cutting long hoses is restricted by the length of the rod-like tool itself.
• the fundamental idea of the invention is to solve the problems outlined above and to make possible rapid and efficient cutting of hoses, particularly hoses intended for hydraulically operated machinery, and this in a manner that prevents various residual products from adhering to internal hose faces at the hose ends at the point of cutting.
• a further object of the invention is to suggest a method and a device enabling cleaner cutting of hoses, irrespectively of the intended length of the hose to be cut .
• these objects are obtained by means of the hose-cutting device defined in the appended claim 1 and the hose cutting method defined in the appended claim 10.
• Preferred embodiments of the device are defined in the dependent claims 2-9.
• the invention concerns a cutting device for cutting hoses, which device comprises a cutting means to cut the hose at a cutting point, at least one source of pressure for pressurising a medium inside the hose to a pressure amounting to between 1 and 100 bars, and connecting means for pressurising said medium inside the hose, said connecting means adapted to be applied at the hose ends.
• the inventive cutting device allows cleaner cutting of hoses to be made without particles and dust penetrating into and adhering to the inner face of the hose, thanks to it being possible to perform the cutting operation while the hose to be cut is simultaneously subjected to an excess pressure. Owing to the excess air pressure thus applied, dust and particles that form during the cutting operation will instead flow in the direction outwards, out of the hose ends.
• the flow generated by the excess pressure applied inside the hose makes it possible to simultaneously cool the cutting means.
• the medium inside the hose is air.
• the temperature of the air may be regulated to cool the cutting means as desired.
• the cutting device preferably is equipped with a feeder designed to advance the hose up to a cutting point.
• the inventive cutting device is provided with measuring equipment, along which the hose may be displaced to allow the intended length of the hose to be determined in a simple manner before the cutting operation is initiated.
• Connecting means preferably are provided to continuously supply pressure to the medium inside the hose, at least for as long as the hose-cutting operation is in progress.
• the pressurisation of the medium inside the hose should be carried out continuously throughout the entire cutting cycle .
• the cutting device in accordance with the invention preferably comprises two sources of pressure, each one of which is formed with a connecting means, the latter in turn designed to be coupled to a hose end in order to allow supply of pressure to the medium inside the hose.
• the invention thus also concerns a hose-cutting method, comprising the steps of pressurising a medium inside the hose to a pressure of 1-100 bars by application onto the hose ends of connecting means, which are coupled to at least one source of pressure, and of effecting the cutting by means of the cutting device while the medium is pressurised.
• the medium is pressurised continuously for at least as long as the hose-cutting operation is in progress.
• the method steps are repeated for each length of hose to be cut, thus forming a cutting cycle.
• the hose-feeding step etcetera may be made automatic .
• the medium inside the hose is temperature-controlled.
• the inventive method offers a possibility of cooling the cutting means at the same time as the latter cuts through the hose.
• the method and the cutting device in accordance with the invention are suitable for use in conjunction with cutting of reinforced hoses, such as reinforced hydraulic hoses.
• the cutting device is formed with a measuring unit.
• the hose end may be displaced with a high degree of accuracy to a position spaced the required distance from the cutting point, in which position the hose may be fixed. This distance coincides with the desired length of the hose to be cut off.
• Fig 1 is a schematic perspective view of the cutting device .
• Fig 2 is a schematic perspective view of an alternative embodiment of the cutting device.
• Fig 1 shows a cutting device 1 in accordance with a preferred embodiment.
• the cutting device 1 comprises a first body 13 and a second body 14 carrying between them a rail 15, which interconnects the two device bodies 13, 14.
• the first body 13 has an essentially flat working top 18 extending in a horizontal plane at a suitable working level and onto which top a hose 2 is intended to be advanced preliminary to its being cut.
• Said first body also comprises a cutting means 3, in the shown example in the form of a motor-driven cutting disc 16.
• the cutting disc 16 is mounted on the motor for rotational movement.
• a holder-on member 17 are arranged to be shifted essentially in one plane towards the cutting disc 16 between two extreme positions, one inactive position and one cutting position, not shown in closer detail in the drawing figures.
• the cutting means 3 comprises an abutment member 17 abutting against the hose 2 when the cutting disc 16 penetrates the hose at the intended cutting point.
• the abutment member 17 preferably is located spaced from the position of rest of the cutting disc 16, the space in between intended to accommodate hoses of varying dimensions that is being advanced on the working top.
• the first body 13 comprises a feeder unit 6, which advances the hose 2 across the working top
• the hose 2 is advanced by the feeder 6 in a direction of advancement A, past the cutting point 4 and further on towards the rail 15.
• a stop means 5 is arranged for displacement on the insertion rod 7.
• the stop means 5 thus is moveable and in accordance with a preferred embodiment it may also be fixed in any desired position along the rail 15.
• a measuring unit 12 is provided on the rail, which measuring unit serves to determine the distance between the cutting point 4 and the end of the hose, the latter preferably being placed in abutment against the stop means 5 in conjunction with the cutting operation.
• the measuring unit 12 could be designed as a conventional simple measuring ruler that extends along the path of advancement of the hose or else as a more sophisticated measuring system including transducers, readers and display means for presentation of the measurement values.
• One preferred kind of transducer consists of a measuring wheel, which is read digitally.
• a method is suggested of diverting residual machining fragments generated in conjunction with hose cutting operations, said method comprising the steps of pressurising a medium contained inside the hose to a pressure of between 1 and 100 bars by application onto the hose ends of connecting means 9, which are coupled to at least one source of pressure.
• the source of pressure 8 is a conventional compressor generating a pressure of about 8 bars .
• the pressure inside the hose 2 amounts to between 1 and 100 bars, the purpose being to prevent residual particles from adhering to the inner faces of the hose 2, but preferably the pressure amounts to between 1 and 20 bars, and more preferably to between 4 and 8 bars, most preferably to about 8 bars.
• Modern compressors of conventional technology generate about 8 bars, making these compressors particularly useful.
• the source of pressure 8 is a fan.
• the source of pressure 8 is an air pump.
• One suitable type of pressure generator is a sliding vane compressor having a capacity of free output air of about 0.6 m 3 /min.
• Compressor delivering about 0.6 and 2.2 m 3 /min of free air are commonly available today and they may be used to construct the inventive device.
• the hose ends are designed to " Have a complementary engagement fit with their respective connecting means 9, whereby an airtight connection is created at each hose end, allowing a pressure to build up inside the hose in anticipation of the cutting operation.
• the opposite end of the connecting means 9 is connected to its source of pressure via a hose or other suitable means.
• the connecting means 9 may be supplied with a pressurised medium, for example by means of pressurised air, from a common source of pressure 8.
• This drawing figure likewise shows the manner in which a hose reel 20 is arranged to advance considerable lengths of hose 2, for example in a controlled manner.
• the connecting means 9 preferably is coupled to the hose end that is arranged in the centre of the hose reel 20, via a swivel joint that in this case is incorporated in the connecting means 9. It will be appreciated that for hose lengths of considerable length, it may be advantageous to arrange a hose reel also on the receiving end of the cutting device.
• the means connecting the source of pressure 8 to the hose 2 also in this case preferably is a swivel -joint type of connection coupled to the hose reel 20 at the centre thereof .
• the cutting means 1 is provided with safety means of standard type, such as emergency stop means, two-hand control devices, no-voltage circuit breakers and a spring- actuated shield for the cutting disc 16.
• the cutting means 3 need not necessarily have a circular shape as illustrated in the drawings but could be configured in various ways and could for example be a blade-like cutting blade, which is moved in a backwards-forwards movement to cut through the hose 2.
• the cutting means 3 is a water jet or a laser.
• the method of cutting the hose 2 may be implemented by making the cutting device 1 operate in a more or less automated way.
• the stop means 5 is designed with an automated stop function. The automated stop function is triggered off when the hose 2 abuts against the stop means 5.
• the device is for example applicable also to rigid hoses and pipes.
• rigid hoses or pipes When rigid hoses or pipes are used, these should be regarded as included in the concept of hose as referred to herein.
• Further preferred embodiments of the invention thus may be created by providing the cutting device with additional equipment within the scope of what the expert in the field considers to be obvious, such as hose reels for winding-on the hose, not shown in detail as they are well known.
• hose reels for winding-on the hose not shown in detail as they are well known.
• By combining characteristic features of different alternative embodiments of the invention described herein additional possible varieties may be obtained that are within the scope of the inventive idea. It is considered to be within the competence of the expert in the field to choose a compressor, alternatively a pump or other pressure sources to provide suitable embodiments within the scope of the invention.
• one of the connecting means 9 is a seal applied to one hose end, whereupon the pressure of the medium inside the hose is built up by connecting the opposite hose end to a source of pressure 8.
• This embodiment is not shown in detail in the drawings.
• other media than air could be used to build up an excess pressure inside the hose before it is cut, and in this manner create a flow of medium out of the hose that prevents residual products and particles from entering the hose in conjunction with and also following the cutting operation.

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20283942

Family Applications (1)

Country Status (7)

Citations (3)

• 2001
  • 2001-04-30 SE SE0101515A patent/SE518959C2/sv not_active IP Right Cessation
• 2002
  • 2002-04-26 AT AT02766714T patent/ATE391589T1/de not_active IP Right Cessation
  • 2002-04-26 WO PCT/SE2002/000822 patent/WO2002087836A1/en not_active Application Discontinuation
  • 2002-04-26 EP EP02766714A patent/EP1390179B1/de not_active Expired - Lifetime
  • 2002-04-26 DK DK02766714T patent/DK1390179T3/da active
  • 2002-04-26 ES ES02766714T patent/ES2304449T3/es not_active Expired - Lifetime
  • 2002-04-26 DE DE60226020T patent/DE60226020T2/de not_active Expired - Lifetime

Patent Citations (3)

Also Published As

Similar Documents

Legal Events