DE102021131950A1 - Cutting device for polystyrene foam - Google Patents

Abstract

The invention relates to a cutting device for cutting thermoplastic foams such as polystyrene foam, a plurality of cutting wires being arranged on a frame running horizontally parallel to one another, the cutting wires being guided in wire guides or being arranged on guide wires which are guided in wire guides, the wire guides being Horizontal grooves for receiving and guiding the cutting or guide wires, the at least one wire guide (1) having the outwardly open grooves (8) on a peripheral wall (7), the groove (8) having a bearing area (11) in the the groove (8) is closed except for a slot (13), a bearing bushing (16) being arranged in the bearing area (11) of the groove (8) which has an outer contour which is wider than the slot (13) and corresponds essentially to the inner contour of the groove (8) in the bearing area, the bearing bush having an axial recess (18) in which the cutting wire or the guide wire (2) is accommodated.

Description

The invention relates to a cutting device for polystyrene foam according to the preamble of claim 1.

Cutting devices for polystyrene foam are known and in particular devices are known which serve to divide a block of polystyrene foam into polystyrene foam panels.

For this purpose, a grid of horizontally running wires is usually stretched out and a polystyrene foam is passed through this grid.

In particular, the wires can be charged with electric current in such a way that they heat up and slide through the polystyrene foam, partially melting it in the area of the cuts.

Such devices for cutting polystyrene foam thus have a plurality of wires arranged horizontally one above the other, the wires being arranged on both sides of the block to be cut on a frame via wire holders. The wire holders are arranged so that they can be moved vertically on the frame in order to achieve different panel thicknesses. In addition, such cutting devices have a magazine on the frame in which the wires stretched on the wire holders are stored together with the wire holders and can be automatically shifted into a cutting area in order to either cut blocks of different heights or, in the case of thin plates, make a plurality of wires available place. Accordingly, these wire holders can also be moved out of the cutting area again if, for example, a smaller number of cutting wires is required, particularly with thicker panels.

In 1 shows in a highly schematic manner how such a wire mesh cuts through a block of polystyrene, but the frame is not shown here. 2 shows a wire holder according to the prior art, it being evident that the wire holder has a greater thickness than the cutting wire or, in the example shown, the holding wire for the cutting wire. The thickness of the wire holders limits the thickness of the polystyrene foam sheets to be cut to the thickness of the wire holders, at least when the wires are arranged horizontally and arranged vertically one above the other. In 3 one recognizes how it is usually ensured in the prior art that thinner plates can also be cut. For cutting panels with a thickness or height that is less than the thickness of the wire holders, the entire frame is tilted in such a way that the virtual vertical spacing of the cutting wires is thereby reduced.

However, it has been found that with such a tilting of the frame of the cutting device, the plate thickness can vary and is uneven.

The object of the invention is to further develop a cutting device for polystyrene foam panels in such a way that thin panels can be cut evenly.

The object is achieved with a cutting device having the features of claim 1.

Advantageous developments are identified in the dependent claims.

The inventors have found that an uneven cutting performance of a cutting device in a severely tilted state is caused by the fact that the cutting wires slip in their guide or move in the guide and are thus deflected.

In particular, it was found that the guide groove of a conventional wire holder is not able to ensure adequate guidance in the event of severe tilting.

According to the invention, a conventional simple groove according to the prior art is designed in such a way that the groove is now at least partially formed in such a way that the groove is cylindrical in cross section with a slot-like opening pointing outwards, the slot-like opening having a width that corresponds to the thickness of a wire or slightly wider, but the width of the slot is smaller than the transverse extent of the groove.

A cylindrical guide bushing is mounted in this groove with a cylindrical inner contour, the cylindrical guide bushing having an outer diameter which corresponds to the cylindrical inner diameter of the groove.

The cylindrical guide bush has an axial longitudinal bore or axial longitudinal recess, the diameter of which corresponds to a wire which is to be guided in the groove or is slightly wider.

In addition, the guide bushing is slidably mounted in the groove and can also be removed from the groove in an expanded area of the slot or pushed out of the area of the wire guide that has the cylindrical groove, so that it is possible after removal slide the guide bush to remove the wire from the wire holder, e.g. for maintenance work.

The guide bushing can also be fixed in the wire holder at the corresponding position in the groove if this appears necessary, in particular by means of a grub screw or the like arranged on the wire holder.

The invention thus relates in particular to a cutting device for cutting thermoplastic foams such as polystyrene foam, a plurality of cutting wires being arranged on a frame running horizontally parallel to one another, the cutting wires being guided in wire guides or being arranged on guide wires which are guided in wire guides, the Wire guides for receiving and guiding the cutting or guide wires have horizontal grooves, the at least one wire holder having the outwardly open groove on a peripheral wall, the groove having a guide area in which the groove is closed except for a slot, wherein in the guide area a bearing bush is arranged in the groove, which has an outer contour which is wider than the slot and essentially corresponds to the inner contour of the groove in the bearing area, the bearing bush having an axial recess in which the cutting wire or the guide wire is accommodated.

A further development provides that the socket is arranged fixedly or longitudinally displaceably on the cutting wire or guide wire.

A further development provides that the bushing is fixedly arranged on the cutting wire or guide wire in such a way that the position corresponds to the position of the guide area when the cutting wire or guide wire is fixed and tensioned on the wire holder.

A development provides that the bushing is arranged to be longitudinally displaceable on the cutting wire or guide wire and can be fixed in the guide area with a fixing means.

A development provides that the bushing is fixed in the guide area with a locking screw, a wedge, an adhesive, a solder, a weld, a friction or press fit or the like.

A further development provides that the groove or the slot of the groove widens adjacent to the guide area in such a way that the bushing can be removed outwards from the groove in the widened area.

• 1: Stark schematisiert einen zu schneiden Polystyrolblock mit Schneiddrähten, welche durch den Block geführt werden;
• 2: einen Drahthalter nach dem Stand der Technik;
• 3: einen Polystyrolblock, welcher mit Schneiddrähten geschnitten wird, welche auf 30° Rahmenneigung verkippt sind;
• 4: einen Drahthalter nach der Erfindung;
• 5: ein Drahthalterpaket in einer Schneidvorrichtung.

The invention is explained by way of example with reference to a drawing. They show:

• 1 : Highly schematic of a block of polystyrene to be cut with cutting wires passing through the block;
• 2 : a prior art wire holder;
• 3 : a polystyrene block cut with cutting wires tilted to 30° frame inclination;
• 4 : a wire holder according to the invention;
• 5 : a wire holder pack in a cutting device.

1 Fig. 12 shows a conventional block of polystyrene to be cut 101, which has a long side wall 102 and a short side wall 103. In addition, the block has an upper side 104. For the purpose of cutting up the block, cutting wires 105 are present, which are guided in a guide (not shown) and in a 1 frames that are not visible. Out of 1 It can be seen that these cutting wires are each cut by a wire 105 in a plane running parallel to the upper side 104, with the wires 105 thus being guided horizontally through the block 101 in a conventional orientation.

The distance between the wires thus also determines the height of the individual plates 106.

In the prior art, such cutting wires are usually held in a frame on a hook on both sides of the block 101, the hook 107 engaging in a loop of the cutting wire (not shown), the hook 107 being connected to the loop 108 of a guide wire 109, wherein the guide wire 109 is guided in a wire guide 110 and is attached to the wire holder or another component with a further wire loop 111 diametrically opposite the wire loop 108 in such a way that the wire 109 is able to tension the cutting wire 105 .

In order to enable sufficient wire tension, a spiral spring is arranged as a tension spring on at least one of the hooks 107 and only then the cutting wire 105. So that the tension springs (not shown) do not cause the distance between the wires to become too large, they are mutual arranged on both sides of the frame.

The wire guide 110 according to the prior art can be displaced vertically on a cylindrical guide rod (not shown) transversely to the extension of the wire 105, the wire holder 110 having a cylindrical receiving recess 112 that is at least more than semicircular for this purpose. The wire holder or the wire holder also has a support groove 113 that runs in the shape of a part circle for receiving the wire 109.

The support groove 113 is, for example, a rectangular groove 113 introduced from the outside into the body of the wire holder. As already explained, if a frame with wire holders and wires 105 arranged therein is inclined, for example an inclined position of 30°, as in 3 shown, the disadvantage is overcome that the wire holders have a certain thickness, so that with the appropriate inclination, plates 106 can also be cut with a thickness that is less than the thickness of the wire holders 110. However, it is also off 2 It can be seen that this means that the wire holders are tilted in such a way that the wires 109 are no longer pressed into the bottom of the groove 113 under load, but rather against the side wall of a groove (not shown), with the risk that the wires either slip completely out of the groove or move along the side wall 114, which in the case of the inclined position means that a different thickness of the corresponding plate 106 is caused here.

A modified wire holder 1 is used in a cutting device according to the invention. A wire 2 acting on a hook 3 is also used in the modified wire holder 1 can be.

The wire holder 1 is a disk-like element which has at least partially a circular circumference or a circular circumferential wall 7 . At one end of the peripheral wall 7, the bearing 6 for the cylindrical bearing piece 4 is present. In the circular peripheral wall 7, the bearing groove 8 for the wire 2 is arranged.

A receiving opening 8 is arranged concentrically to the circular peripheral wall 7 around a vertical axis (not shown) of the wire holder 1, which is delimited, for example, by a three-quarter circular inner wall 9, with the inner wall 9 or the guide opening 8 opposite the peripheral wall 7 having a mouth 10 has, so that the receiving opening 8 is not closed cylindrical. The groove 8 or the circular peripheral wall 7 are formed in a region opposite the mouth 10 in such a way that the groove 8 is formed part-cylindrically from the inner contour, with a slot 11 pointing outwards. The slot 11 is narrower than the Groove 8 in the groove areas adjacent to this area, whereby the groove is designed with an expanding cross section on the inside, from a rectangular area of the groove 8 to the guide area 13 of the groove 8 opposite the mouth 10. In a transition area 14 of the guide area 13 of the groove 8 to a rectangular area 12 of the groove 8, the slot 11 correspondingly widens to the width of the groove 8 in the area 12. A feed opening 15 is thereby formed.

A guide bushing 16 can be inserted into the area 11 via the feed opening 15 of the groove 8 from the rectangular area 12 into the guide area 13 .

The guide bushing 16 is cylindrical, the outer wall 17 of which has a diameter which corresponds to the inner diameter of the region 11 of the groove 8 and has a coaxial central recess 18 which corresponds to the diameter of the wire 2 or is somewhat wider.

The bushing 16 is pushed onto the wire 2 before its assembly and in particular before the production of the end piece 4 or the eyelet 19 diametrically opposite this and can be slidably arranged on the wire or be arranged fixedly on the wire 2 .

In a fixed arrangement, the position of the sleeve or bushing 16 on the wire is fixed and thus the position in the guide area 13 of the groove 8 is fixed after the end piece 4 has been pushed into the bearing 6 and before it is arranged on the hook 3 .

In addition, the bushing 16 can also be fixed in the wire holder 1, for example with a grub screw running transversely to the groove in the region of the cylindrical groove 11.

The advantage of this design of a wire holder 1 of a cutting device is that the wire remains reliably in the groove 8 and is fixed with respect to its horizontal position even if the frame is in an inclined position. Nevertheless, after releasing the tension on the cutting wire 105, this wire can also be detached from a hook 3 and then pushed out together with the bushing 16 from the cylindrical area 11 of the groove 8 via the mouth area 15 so that the wire can be dismantled.

Instead of an indirect guidance of the cutting wire via the wire 2, the cutting wire (not shown) itself can be guided in the wire holder 1.

5 shows the arrangement of the wire holder 1 on a guide rod 20 of a frame 21 of the cutting device. Wires 2 guided in the wire holders can be seen, which act with corresponding eyelets 19 either on hooks 3 or on springs 22 arranged alternately with hooks 3, with the corresponding cutting wires (not shown) being arranged on hooks 3 or springs 22 . The springs 22 and the hooks 3 are arranged alternately, with the opposite frame, where in 5 a hook is shown, there is a spring and vice versa, so that the springs are alternately present on both frame sides, so that the cutting wires can be correspondingly tensioned with the springs.

The wire holders 1 are non-rotatably mounted on the guide rod 2, but are axially displaceable along the guide rod 20 in order to be moved accordingly to corresponding thicknesses of the polystyrene plates to be cut. In the displaced position, the wire holders 1 are then secured in a manner known per se on the guide rod 20 against further displacement. One recognizes in 5 also that when the frame is tilted for the purpose of reducing the vertical spacing of the wires when the frame 21 is tilted, the wires are nevertheless guided securely in the grooves 8 .

The opening area 15 is also clearly visible, from which the sockets 16 can be pushed out of the eyelet 19 after the spring 22 or the hook 3 has been released, in order to remove the wire 2 from the wire holder 1 .

The advantage of the invention is that a device for cutting polystyrene foam is created in a simple and cost-effective manner, in which the wires that hold the cutting wires are arranged in the wire holders in such a way that they can be securely held in place even if the frame is tilted Groove to hold the wire, even if the tilting is carried out very far. This means that it is also possible to cut very thin polystyrene foam boards, in particular thinner boards than before, and more precise cutting is also possible.

Reference List

1

wire holder

2

wire

3

Hook

4

cylindrical bearing piece

5

free end

6

cylindrical storage

7

circular peripheral wall

8th

groove

9

three-quarter circular inner wall

10

mouth

11

outward-facing slit

12

rectangular area

13

management area

14

transition area

15

feeding mouth

16

guide bush

17

shell wall

18

coaxial central recess

19

diametrically opposite eyelet

20

guide rod

21

Frame

22

feathers

101

polystyrene block

102

long side wall

103

narrow side wall

104

top

105

cutting wires

106

plate

107

Hook

108

loop

109

guide wire

110

wire guide

111

wire loop

112

semi-circular cylindrical receiving recess

113

carrying slot

114

sidewall

Claims (6)

Cutting device for cutting thermoplastic foams such as polystyrene foam, a plurality of cutting wires being arranged on a frame running horizontally parallel to one another, the cutting wires being guided in wire guides or being arranged on guide wires which are guided in wire guides are, the wire guides having horizontal grooves for receiving and guiding the cutting or guide wires, characterized in that the at least one wire holder (1) has the outwardly open groove (8) on a peripheral wall (7), the groove (8 ) has a guide area (13) in which the groove (8) is closed except for a slot (11), a bearing bushing (16) being arranged in the guide area (13) of the groove (8) and having an outer contour which is wider than the slot (11) and essentially corresponds to the inner contour of the groove (8) in the bearing area, the bearing bushing (16) having an axial recess (18) in which the cutting wire or the guide wire (2) is accommodated. cutting device claim 1 , characterized in that the bushing (16) is arranged fixedly or longitudinally displaceably on the cutting wire or guide wire (2). cutting device claim 1 or 2 , characterized in that the bushing (16) is firmly arranged on the cutting wire or guide wire (2) in such a way that the position when the cutting wire or guide wire (2) is fixed and tensioned on the wire holder (1) corresponds to the position of the guide area (13). . cutting device claim 1 or 2 , characterized in that the bushing (16) is arranged to be longitudinally displaceable on the cutting wire or guide wire (2) and can be fixed in the guide area (13) with a fixing means. cutting device claim 4 , characterized in that the socket (16) is fixed in the guide area (13) with a locking screw, a wedge, an adhesive bond, a soldering, a weld, a friction or press fit or the like. Cutting device according to one of the preceding claims, characterized in that the groove (8) or the slot (11) of the groove (8) adjacent to the guide area (13) widens in such a way that the bushing (16) in the widened area can be removed from the outside of the groove.

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