DE4341864C2 - Device for removing welding beads from plastic pallets and cutting devices used thereby - Google Patents

Description

When welding several individually injected subcomponents together Plastic beads can weld beads on the sub-components Form places where they are assembled and welded. The present The present invention relates to a system for removing welding beads, that arise when a plastic pallet is welded together. More accurate said, it relates to a sweat removal system from a plastic pallet, which are created when the in the horizontal direction several upper and lower component parts divided pallet into one piece is welded together, as well as on cutting device used in this system directions.

Conventionally, plastic pallets are manufactured either by injection molding one-piece parts using an injection molding machine or by using a butt welding process in which the end faces of pre-sprayed partial components of a pallet are joined by welding. In the case of butt welding, a plastic pallet is divided into several sub-components in various ways, e.g. B. as shown in Fig. 9 to 12, where a pallet is divided in the horizontal direction. The pallet shown in Figures 9 and 10 is a four-way pallet (ie it contains four insertion openings for a forklift fork). The pallet 1 is divided in the horizontal direction along the dividing line 5 located approximately in the middle of the height of the spacer 3 into an upper part 7 and a lower part 9 . FIGS. 11 and 12 show a two-way pallet 2 (DH includes two introduction apertures for a forklift fork), which in the horizontal direction along the dividing line 6 is located substantially in the middle of the height of the carrier 4 into an upper part 8a and a lower part 8 b is divided. These upper and lower parts 7 and 9 or 8 a and 8 b are joined at their respective end faces by butt welding.

In order to butt-weld the end faces of partial components, the upper and lower parts 7 and 9 or 8 a and 8 b are held in place between a pair of pressure plates with their end faces so that they lie opposite one another. A heating plate that can be pushed back and forth is then inserted between the two parts lying between the pressure plates. The pressure plates are brought closer to each other while the heating plate is between the two parts until the end faces of the parts touch the heating plate in order to be heated and fused together. After a certain period of time, which serves to heat up until the melting process begins, the pressure plates are pulled apart and the heating plate is withdrawn. The pressure plates are then closed again in order to connect the upper and lower parts 7 and 9 or 8 a and 8 b to one another by pressure. During this process, welding beads can easily form on the butt-welded front ends. In other words, since the butt-welded end faces are joined together by pressing them together while they are slightly melted, this means that the molten plastic material can flow out and form weld beads on the sides.

Sweat bulges are undesirable because they not only look ugly but also can also cause problems because they are when inserting a forklift fork can break off and scatter on the floor. The broken ones Welding beads as foreign bodies can contaminate the articles on the in a stack of pallets lying at the bottom made up of several pallets be set. The weld beads formed on the sides of a pallet are undesirable as it can happen when pallets are juxtaposed that sweat beads tilt together and the displaceability of Interfering with pallets or even causing a pallet to break. Furthermore, welding beads on the sides of a pallet can where a forklift fork is inserted, that forklift fork will get in the way and hinder the easy insertion of this fork. If the fork is violent inserted, the spacer may break.  

Because of these disadvantages, sweat beads are traditionally up to to a certain extent, mainly by hand under Using a knife. Due to the applied handicraft it is Removal of welding beads is not only time-consuming but also inadequate due to the fact that it is not possible to remove welding beads from inside the pallet. It is on the other side in mechanizing this removal process only possible welding beads that were on flat surfaces, relatively easy to remove, but sweat sticks that are on curved Surfaces could not be removed.

Because of the above situation, the present invention devised and aims to provide an automatic device for removing To provide welding beads from a plastic pallet.

Furthermore, a system is to be provided which welds themselves completely remove from curved surfaces of a plastic pallet can.

In addition, cutting devices are to be provided, which in this System for removing welding beads can be used.

No devices are known from the prior art, which deal with the Solving the problem of removing welding beads on plastic deal with pallets. Considered as the closest prior art Teten DE-OS 23 13 681 is a device for eliminating Press weld beads and for plastering mitres on plastic windows known. However, this is like an essentially rectangular one shaped in a circumferential window profile on the welded profile frame protruding welding beads can be removed. For this, the Window frame relative to one along the peripheral wall of the profile frame running milling cutter rotated by 360 °, so that the entire circumferential wall of Sweat beads can be freed.

However, this device and the associated procedure cannot be used for the pallets explained above in connection with FIGS. 9-12 with closed top and bottom surfaces and spacers attached between them.

The above objects are achieved by a device according to the invention according to claim 1 and a cutting device according to claim 10 solved.

The advantages of the invention result from the following Description of an embodiment in connection with the drawing; show it:

Fig. 1 is an overall view of the system for removal of weld beads from the front with certain parts omitted;

Fig. 2 is an overall side view of this system;

Fig. 3 is a front view showing a pallet holder;

Fig. 4 is a partially enlarged perspective view showing the pallet holder;

Fig. 5 is a planar section showing part of the serging device which can move back and forth relative to the pallet holder;

Fig. 6 is a section showing a part of the serging device from the front;

Fig. 7 is a flat section showing cutting devices for the welding beads;

Fig. 8 is a perspective view showing a cutter for the welding beads with certain parts omitted;

Fig. 9 is a perspective view showing how a four-way pallet can be divided;

FIG. 10 is a plan view of a shared four-way pallet;

Fig. 11 is a perspective view showing how a two-way pallet can be divided;

Fig. 12 is a plan view of a split two-way pallet.

In order to achieve the above-mentioned goals, one according to the invention  Device the following structure:

The device for removing welding beads from a plastic pallet comprises a pallet holder that can be pushed back and forth, which is a pallet holds and rotates, as well as a serging device. This purification direction comprises a device which is provided with cutting devices and can move it back and forth, as well as a pallet transport direction, these two being arranged side by side.

More specifically, the pallet holder includes a moving back and forth Cart, a device for rotating the pallet and support units, which are attached to the cart and are at a certain distance from each other face each other as well as pallet transport devices that are between the Device for rotating the pallet and the support units housed are. This device for rotating the pallet is slidable Carrier unit provided, in a frame connected to this car attached, which moves back and forth in the same direction as the carriage is, as well as with a rotatable shaft, which with a rotatable plate on its End is connected and rotatably attached to this slidable support unit is. The fixed support unit comprises a rotatable shaft which is on the top of a Frame is attached to this car and the end of it with a rotatable plate is provided. The device for moving the back and forth Cutting edge of the serging device is relative to it Pallet holder movable sliding frame provided. Furthermore are on this movable frame vertically movable arms attached with Cutting blades are provided at their ends.

The cutting tool used in the sweat removing device directions each include a vertically and horizontally movable arm, a lever, the rear end of which is rotatably mounted on this arm, and a holder, which is mounted at the upper end of this lever and the cutting blade holds at its front end so that it can be replaced. This Holder is with guide rollers and one between the guide rollers attached tension spring provided, and the lever arm end ensures that the  Cutting blade is continuously pressed against the welding beads.

In the above-mentioned device for removing welding beads, the and returning carriages for a pallet inserted into the device moved forward and after removing the welding beads laterally with the Cutting devices and aligned with the pallet transport devices becomes. Hold the pallet rotating device and support units a pallet fixed in the pallet transport device, which is between this Device and the carrier units is located. A pallet is held while a slidable carrier unit in the device for rotating the pallet moves forward and the pallet against the opposite fixed Carrier unit presses. The pallet transport device comprises a transport device, there will be a certain distance between the transport device and adhered to the bottom of the pallet so that an arm can be inserted. To remove sweat, a device moves to the front and Move a serrator cutting blade forward and ensures that the cutting blade against the surface of the weld bead is pressed and that the cutting blade shaves away the welding beads while the device for moving the cutting blade back and forth pulls. Then the device for rotating the pallet is operated, which is therefor ensures that the pallet rotates through a certain angle.

The device for moving the cutting blade back and forth is shown in similarly moves forward and ensures that the cutting blades counter press the surface of the weld bead and that the weld beads are removed can be while the device for moving the back and forth Cutting blades pulls back. When the sweat beads are removed, the Pallet shifted so that it is perpendicular to the first pallet transport device is aligned, which is then the pallet to the side the pallet transport device located in the serging device pushes on. The palette is now available for the next step. There the arm of the device for moving the cutting blade back and forth is vertically displaceable, its position can be adjusted to type and size of the pallet to be treated.  

In the serging device, the cutting blades are held by holders held, which are pivotally attached to the front of rotatable lever arms, so that while a lever arm rotates the associated cutting blade further The inside of the pallet can be inserted as it is the surface of the sweat bead would correspond. This allows you to look inside an arched Remove any welding beads on the surface. The one attached to the holder Tension spring ensures that the cutting blade is permanently under one certain angle is pressed against the surface of the weld bead.

The inventive device for removing welding beads is now in the following explained in more detail using an exemplary embodiment.

The present invention is characterized in that pallets for Removed welding beads in an upright position processed and trans can be ported. Another feature is that the cutting blade for Removal of the welding bead inside the pallet through insertion openings for Forklift forks can be inserted into the pallet. Another Another feature is that the cutting blade is in a circular Bow can be rotated so that the cutting blade permanently under one certain angle is pressed against a curved surface.

The device for removing welding beads according to the invention comprises a pallet holder 10 , which holds a pallet moved in an upright position by means of transport devices, and which ensures that the pallet is rotated by a certain angle, and the serging device 11 , which faces the pallet holder 10 held pallet moved back and forth from it and which is provided with a vertically movable cutting device. As shown in FIG. 1, the pallet holder 10 contains a device 15 for rotating the pallets, a fixed carrier unit 17 opposite this device for rotating 15 , and a first transport device 19 located between this device 15 for rotating and the fixed carrier unit 17 . The pallet holder 10 is able to move back and forth perpendicular to the transport direction of the pallet. The serging device 11 comprises devices 20 for moving the cutting blades back and forth as well as a second transport device 21 .

According to the above structure, the pallet A is moved by the pallet transfer device 13 to the first transport device 19 of the pallet holder 10 and held between the rotatable device 15 and the fixed support unit 17 . The rotating device 15 and the fixed support unit 17 , which hold the pallet A, move forward and align the pallet A with the device 20 for moving the cutting blade of the serging device 11 back and forth. The device 20 for back and forth because of the cutting blade is then used to remove the weld beads. The cutters ensure that the cutting blade moves out of the holding frame into the system further than the horizontal weld bead surfaces. Since the cutting blade holder is rotatable, the cutting blade can be pressed against the curved surface on the pallet side at a certain angle. This makes it possible to completely remove sweat beads on flat and curved pallet surfaces. After the welding beads have been removed, the pallet A is pulled back into its original position and the device for rotation 15 holding it and the carrier unit 17 are opened. The first Transportvor direction 19 is actuated and the pallet A is moved by the transport devices 19 and 21 to the next step.

The construction of various devices mentioned above is as follows described in more detail.

The pallet holder 10 comprises a carriage 25 which is displaceable on a base plate 23 and the device for rotating 15 ; the fixed support unit 17 and the first transport device 19 are mounted on the carriage 25 . In other words, that a pair of rails 27 rests on the base plate 23 and a pair of guide members 29 attached to the underside of the carriage 25 engages in the rails so that the carriage is displaceable. A pneumatic shear cylinder 30 is mounted on the base plate 23 , its piston 31 being fastened to the carriage 25 with the fastening plate 33 . During operation of the pneumatic working cylinder 30 , the piston 31 is moved, whereby the carriage 25 is caused to move in the direction indicated by the arrow a in FIG. 3. The rails 27 are perpendicular to the direction of movement of the pallet. The carriage 25 ensures that the pallet A is moved back and forth between the device 20 for moving the cutting blade back and forth and the second transport device 21 .

The device for turning 15 comprises a frame 35 which is fixed to the carriage 25 and a displaceable support unit 39 which is attached to the carriage 25 so that it can be freely pushed back and forth, and on which a rotatable plate 37 is pivotably mounted which is used to hold and rotate the pallet A. In other words, the frame 35 is fixedly attached to the carriage 25 and a pair of rails 40 , which run parallel to the rails 27 , rest on the top of the frame 35 . Guide members 41 , which are fastened to the underside of the displaceable carrier unit 39 , engage in the rails 40 in such a way that they can be displaced. The displaceable carrier unit 39 is moved forwards or backwards by a pneumatic working cylinder 43 . The pneumatic working cylinder 43 is fixedly attached to a mounting plate 45 standing on the frame 35 , while a piston 47 of the pneumatic working cylinder 43 is fastened to the displaceable carrier unit 39 . A rotatable shaft 49 with a rotatable plate 37 at its front end and a worm thread 53 at its rear end is rotatably fastened in bearings 50 , 51 to the displaceable carrier unit 39 .

A worm 55 engages the worm thread 53 and the shaft 57 of the worm 55 is connected to a pulley 59 . A drive motor 61 is mounted on a plate 60 mounted on the slidable carrier unit 39 , and a pulley 63 is fixed to the rotatable shaft of the drive motor 61 . A belt is wrapped around pulleys 63 and 59 . When the drive motor 61 is operated, the belt 65 is driven to drive the rotatable shaft 49 via the worm thread 53 and the worm 55 , whereby the rotatable plate 37 attached to the front end of the rotatable shaft 49 is rotated. Four holes 67 are formed on the rotatable plate 37 at substantially equal distances from the rotatable shaft 49 . A retaining pin 69 on the slidable carrier unit 39 engages in one of the holes 67 while the pin is moved forward. The holding pin 69 is mounted in bearings 70 , 71 to be displaceable in the axial direction and the piston of the pneumatic working cylinder 75 is fastened to a carrier plate 73 which is attached in the center of the pin 69 .

Thus, when the pneumatic power cylinder 75 is operated, the holding pin 69 is moved forward by the carrier plate 73 to engage in one of the holes on its front. When the support pin 69 engages in one of the holes 67 , the rotatable plate 37 is prevented from rotating and the pallet A is kept upright. This retention pin 69 is moved forward to hold the rotatable plate 37 in place during the removal of the weld bead. When the rotatable plate 37 is rotated to change the orientation of the pallet A, the pin is withdrawn from the rotatable plate 37 . The devices for preventing the rotation of the plate 37 are not limited to this embodiment; they can be omitted or replaced by any other devices for preventing rotation. In the above structure, the displacement of the slidable carrier unit 39 can be effected by any other drive devices instead of the pneumatic cylinder 43 . The belt 65 looped around the pulley 63 of the drive motor 61 can be looped directly around a pulley connected to the rotatable shaft 49 .

The fixed support unit 17 opposite the rotating device 15 described above comprises a frame 79 which is fastened on this carriage 25 , and a rotatable plate 81 which is fastened on a rotatable shaft 80 which in turn is rotatably mounted on this frame 79 . The frame 79 is attached to the carriage 25 at a certain distance from the frame 35 , and the rotatable shaft 80 and the rotatable shaft 49 lie opposite one another along the axis of the union wesent. The rotatable plate 81 and the rotatable plate 37 hold the pallet A between them, and both rotate together when the rotatable plate 37 is rotated.

Referring to FIGS. 2 and 3, the structure will now be the first pallet transport device 19 explained. The first pallet transport device 19 is mounted between the rotating device 15 and the fixed carrier unit 17 . Pistons 85 of the pneumatic working cylinders 83 , which each extend from the frames 35 and 79 , are attached to a roller holding frame 89 comprising a plurality of rollers 87 . The rollers 87 are moved vertically by actuating the pneumatic working cylinders 83 and the height of their position can be adjusted by the stroke of the pistons 85 . The rollers 87 can be provided with a drive motor by themselves, or they can be provided with a gear wheel which is driven by a chain which is wound around the drive gear wheel of a drive motor, not shown. Instead of the first pallet transport device 19 , another type of pallet transport device can be used, as long as it is ensured that the pallet can be placed between the rotating device 15 and the fixed support unit 17 before the welding beads are removed, and that it can be placed after the welding beads have been removed can be moved further to a pallet transport device 21 of the serging device 11 .

With reference to FIGS. 2 and 5 to 8, the serging device 11 will be explained.

The serging device 11 comprises the device 20 for moving the cutting blades back and forth, which is placed on the base plate 23 of the pallet train sports device 21 . The device 20 for back and forth because of the cutting blades comprises a movable frame 91 to which four arms 90 , each with a cutting blade, are attached at their front ends so that they are vertically displaceable, and a drive device 92 which ensures that the movable frame 91 can be moved back and forth relative to the pallet holder 10 . A substantially L-shaped movable plate 100 , which is attached to the top of the movable frame 91 , is attached to a movable member 103 in the two guide rails 101 , 101 engaging guide member. In other words, the movable frame 91 is fastened to the guide rails 101 , 101 by means of the guide member 103 . On the underside of the movable frame 91 , guide rollers 95 are fastened by means of angles 93 , these two guide rollers 95 being located at a certain distance on both sides of a rail 97 running parallel to the guide rails 101 , 101 . Since the guide rollers 95 hold the rail 97 between them, pendulum movements in the lateral direction can be avoided.

The drive device 92 for displacing the movable frame 91 comprises a chain 105 attached to the outside of the frame 91 and a drive motor 107 for driving the chain 105 . The chain 105 is wound around a toothed wheel 111 , which is fastened to a movable shaft 110 and to a toothed wheel 105, which is fastened to a carrier 113 resting on the base plate 23 . The drive motor 107 is set on a frame 109 and a chain 121 is looped around a gear 119 fastened to the rotatable shaft of the drive motor 107 and around a gear 120 fastened on the other side of this rotatable shaft 110 . The chain 121 is fastened by means of a pressure plate 118 , which is screwed onto a fastening plate 116 resting on the movable frame 91 . Thus, when the drive motor 107 is operated to rotate the rotatable shaft 110 via the chain 121 , the chain 105 is driven via the gear 111 mounted on the movable shaft 110 , causing the movable frame 91 to slide over the rail 97 . By rotating the drive motor 107 in the forward or backward direction, the movable frame 91 can be moved toward or away from the pallet holder 10 .

The arms 90 which are mounted on the movable frame 91 in such a way that they can be moved vertically will now be explained in more detail.

The arms 90 comprise four arms 123 to 126 , each of which with a cutting device 123 a, 124 a, 125 a or 126 a on the front and each with a cutting tool bearing 123 b, 124 b, 125 b or 126 b on rear end is connected. The cutting tool bearings 123 b to 126 b are fastened to ball screw nuts which engage in ball screw drives which are attached in the vertical direction. In other words, drive motors 127 , 129 are mounted on the moving plate 100 which is located on the top of the movable frame 91 . Ball screws 130 , 131 are connected to the rotatable shaft of the drive motors, and the lower end is held by a bearing 133 . The ball screw 130 engages in a ball screw nut 135 , which is attached to the cutting tool bearing 123 b, and the ball screw nut 131 engages in the ball screw 137 , which is fastened to the carrier 124 b.

A ball screw 141 , which rotates in the same direction via a pair of threads 139 , is attached to the ball screw 130 and a ball screw 143 , which rotates in the same direction via a pair of threads 140 , is attached to the ball screw 131 . The ball screws 141 , 143 are supported by upper and lower bearings 145 and 147 , respectively. A ball screw nut 149 , which is attached to the cutting tool bearing 126 , engages in the ball screw drive 141 and a ball screw nut 150 , which is attached to the cutting tool bearing 125 b, engages in the ball screw drive 143 . The cutting tool bearings 123 b, 124 b, 125 b and 126 b are each provided with guide members 151 on each side. The guide members 151 movably engage in a rail 155 which is fastened on the vertical frame 153 of the movable frame 91 .

When the drive motor 127 is actuated, the ball screws 130 , 141 are thus rotated, and ensure that the cutting tool bearings 123 b and 126 b move in the vertical direction by means of the ball screw nuts 135 , 159 engaging in them. When the drive motor 129 is actuated, the ball screws 131 , 143 are rotated and ensure that the cutting tool bearings 124 b, 125 b move in the vertical direction by means of the ball screw nuts 137 , 150 engaging in them. Since each of the cutting tool bearings engages the rail 155 by means of the guide member 151 , they can be easily shifted in the vertical direction while maintaining their horizontal orientation.

The cutters 123 a, 124 a, 125 a and 126 a, which are attached to the front of each arm, are explained below. A cutter 159 , which is directed inward, is attached to each of the cutters 123 a and 126 a, while two cutters 129 , which are directed in opposite directions and face in the vertical direction, on the cutters 124 a and 125 a are attached. In the following only the cutting device 124 a is explained, no special explanation is given for the other cutting devices. The bodies 159 of the cutting device 124 a are embedded between two parallel holding frames 157 , as is shown in FIGS . 7 and 8.

The cutting body 159 comprises a holder 161 for holding a cutting blade 160 , a lever 163 which rotatably holds the holder 161 , and a pneumatic working cylinder 165 for driving the lever 163 . The rear end of the pneumatic working cylinder 165 is rotatably attached to the holding frame 157 by means of a pin 167 . The piston 169 of the pneumatic working cylinder 165 is attached to a mounting plate 170 on the lever 163 . The holder 161 is rotatably attached to the front of the lever 163 approximately at its center by means of a pin 171 . The rear end of the lever 163 is rotatably attached to the holding frame 157 by means of a pin 173 . Furthermore, the holder 161 is removably attached to the cutting blade 160 and is shaped so that the cutting blade 160 presses against the surface of the weld bead at a certain angle. The rear end of the holder 161 is provided with a guide roller 175 and has a tension spring 177 which extends from the lever 163 . The tension spring 177 ensures that the holder 161 rotates about the pin 171 and continuously pushes the cutting blade 160 away from the holding frame 157 . A sensor 176 is attached to the rear end of the lever 163 to check whether the lever 163 is inside the holding frame 157 .

The cutting blade 159 of the embodiment described above is normally within the holding frame 157 . When the piston 169 is retracted by actuating the pneumatic cylinder 165 , the lever 163 rotates about the pin 173 to push the holder 161 out of the holding frame 157 . Since the cutting blade 160 is now further out than the guide roller 175 , the cutting blade can be advanced further inside the pallet than the side of the pallet against which the guide roller 175 abuts. Thus, if the arm 90 is withdrawn at this time, the cutting blade 160 can shave the weld bead. To move the cutting blade 160 from a curved surface to a flat surface, the guide roller 175 is pressed against the surface of the weld bead as the holder 161 rotates around the pin 171 . Thus, the cutting blade 160 can be continuously pressed against the surface of the weld bead at a certain angle.

The use of the device for removing sweat according to the invention beads on four-way pallets will now be described below.

The positions of the pallet holder 10 in the front-lying or the retracted position and the height of the first pallet conveying apparatus 19, etc. are ausjustiert, that is, when the pallet holder 10 is retracted, the first pallet transport device is adapted to the height of the pallet conveying apparatus 13 nineteenth If the pallet holder 10 is moved forward, the first pallet transport device 19 is brought to the height of the frame 90 of the Versäuberungsein device 11 . The height and the extent of the vertical stroke of the first pallet transport device 19 are also adapted to the size of the pallet. The arm 90 and in particular the height of the cutting blade 160 in the extended state are adjusted so that they match the type and size of the pallet. If this preliminary adjustment work has been carried out, the first pallet conveying apparatus is of the pallet holder 10 with the pallet conveying apparatus 13 and the pallet conveying apparatus 21 is directed out 19 to be able to transport the pallet A.

When the pallet A is inserted into the device, the pneumatic working cylinder 43 is operated to advance the slidable carrier unit 39 , whereby the rotating plate 37 and the rotating plate 81 on the side of the frame 79 hold the pallet between them. At the same time, the pneumatic cylinder 75 is actuated to advance the support pin 69 so that its tip can engage in one of the holes 67 made in the rear of the rotatable plate 37 . The holding pin 69 ensures that the pallet A is held firmly in place. Then the pneumatic cylinder 30 is actuated to advance the carriage 125 and align the pallet A with the arm 90 . The pneumatic power cylinder 83 is operated to retract the holding frame 89 to which the roller 87 is attached. By retracting the holding frame frame 89 , the pallet A is freely rotatable, and serging device 126 a can be inserted.

The drive motor 107 of the serging device 11 is driven to rotate the chain 105 . While the chain 105 is rotated, the movable frame 91 moves slowly forward while being supported by the guide rails 101 . When the cutting blade 160 is advanced to a position in which it abuts the surface of the weld bead, the forward movement of the movable frame 91 is stopped by a sensor, not shown. The pneumatic cylinder 165 of the Versäuberungsein direction is then actuated to let the cutting blade 160 pop out of the holding frame 157 . The cutting blade 160 thus protruding can now be inserted further inside the smooth surface to be cut, abutting the inside of the curved surface. If the drive motor 107 is operated again to retract the movable frame 91 , the weld bead can be shaved off by the cutting blade 160 . Since the guide roller 175 now presses against the surface to be cut, the cutting blade 160 can be gently guided over the curved surface at a certain angle in order to shave off the weld bead (see FIG. 7).

If the welding beads extending in the X direction in FIG. 10 are removed after the retracting of the movable frame 91 , the piston 169 is moved forward by actuating the pneumatic working cylinder 165 in order to rotate the lever 163 , in order to temporarily put the cutting blade 160 back into the holding frame 157 to record. The sensor 176 serves to check whether the cutting blade 160 is located in the holding frame 157 . In the meantime, the pallet A in the pallet holder 10 is rotated through a certain angle in order to remove the welding beads running in the Y direction. In order to rotate the pallet A, the pneumatic working cylinder 75 is actuated to pull the holding pin 69 out of the hole 67 . Then, the drive motor 61 is operated to rotate the rotatable shaft 49 through 90 °. The pneumatic cylinder 75 is operated again to advance the retaining pin 69 so that it engages in the hole 67 . In the device 20 for advancing and retracting the cutting blades, the height of each of the arms 90 is reset by operating the motors 127 , 129 if necessary.

When the readjustment is complete, the drive motor 107 is actuated to remove welding beads in the Y direction in the manner described above. When all of the weld beads in both the X and Y directions have been removed, the pneumatic jack 30 is actuated to retract the carriage 25 , thereby aligning the first pallet transport device 19 with the pallet transport device 13 and the pallet transport device 21 . The pneumatic power cylinder 83 is operated to pull up the first pallet transport device 19 so that it abuts against the pallet A. At the same time, the pneumatic jack 43 is operated to retract the slidable carrier unit 39 , thereby releasing the pallet A held by the rotating plate 37 , and the pneumatic jack 75 is operated to pull the front of the support pin 69 out of the hole 67 pull. The pallet A can then be transported out of the system by the pallet transport sports devices 19 and 21 .

In the above explanation, the removal of sweat beads was on a surface performed only once, but it is also possible to remove this If the curvature of the wearer is small, carry out the process twice or if the sweat beads get up excessively. That means that the pallet around Is rotated 180 ° when the removal process in the X direction is completed to perform the process in the backward X direction, making it it is possible to leave welding beads on the curved surface etc. completely remove. Likewise, the process can be in decline Perform the Y direction a second time by rotating the pallet by 180 ° will.

The following section explains the removal of welding beads on a two-way pallet. Since the process of removal in the L direction shown in Fig. 12, that is, in the insertion direction of the forklift fork, is the same as that of the four-way pallet, no further explanation will be given. In the case of the two-way pallet, the removal of the welding beads in the W direction shown in FIG. 12 is not possible if the pallet is held with its fork insertion openings in such a way that they are at right angles to the pallet holder 10 , since there are then no openings , into which the cutting devices 124 a and 125 a can be inserted. The drive motors 127 , 129 are therefore operated to move the cutting devices 123 a, 126 a in the vertical direction. At the same time, the cutter 124 a is brought to the level of the upper side of the pallet and the cutter 125 a is brought to the level of the bottom of the pallet. Then the cutting devices 123 a and 126 a move to the side and the cutting devices 124 a, 125 a are used. The drive motor 107 is operated to move the movable frame 91 forward, and the removal of the weld bead is returned in the W direction in the same manner as described above. For this operation, only the inner pneumatic working cylinder 165 abutting against the welding bead surface is actuated in the cutting devices 124 a and 125 a, in order to let the cutting blade 160 protrude from the holding frame 157 .

Since the cutting devices 123 a, 124 a and 125 a, 126 a can be moved up or down at any distance from the central height setting, pallets of various types and sizes can be accommodated.

In the embodiment described above, the first pallet transport device 19 was aligned with the transport device 13 and the pallet transport device 21 , but it can also be aligned with the arm 90 of the device 20 for moving the cutting blades back and forth. In the latter case, the pallet transport device is aligned with the arms 90 and the first pallet transport device 19 is aligned with the second pallet transport device 21 when the pallet is transported out of the system after the welding beads have been removed. The pallet transport devices 19 , 21 are not limited to certain types. Any type of transport device can be used as long as it is ensured that the pallets are transported.

As can be seen from the above explanation, the present Invention the following effects:

Since the pallet holder is able to hold the pallet so that it can both can move back and forth and also rotate, the device for Advance and retract the cutting blades and the pallet transport forward be aligned with the pallet. Since the device for rotation the pallet and the device for supporting the same in the pallet opposite the holder, the pallet can move forward and backward  Movements of the device for rotating the pallet are recorded, while rotating the held pallet. Since the device for Feeding and retracting the cutting blades with a variety of vertical movable arms is provided with cutting blades that extend towards the pallet or moving away from this, it is possible to insert the arms into the insertion openings insert the forklift fork of the pallet to remove the weld beads, an adaptation to pallets of different sizes is possible.

In the cutting device, the holder provided with a cutting blade is on rotatable lever pivoted and with one of the cutting blade against Provide overlying tension spring so that the cutting blade is inserted further can be considered the horizontal plane, thereby removing sweat bulging on curved surfaces is possible. Because the cutting blade turned If it counteracts the spring force, it can be permanently under one certain angle against the surface of the weld bead.

Claims (11)

1. Device for removing welding beads on plastic pallets, which form during welding on the spacers between the upper and lower part of the pallet in the region of the dividing line, consisting of

• 1. - a carriage which can be moved back and forth ( 25 ),
  on which, on the one hand, a fixed support unit ( 17 ) and a support unit ( 39 ) which can be displaced for this purpose are arranged, which are each provided with a coaxially arranged rotating device ( 15 ; 80 , 81 or 37 , 49 ) for the pallet,
  and on the other hand, a first pallet transport device ( 19 ) arranged between the carrier units ( 17 , 39 ) is attached, which serves to feed the pallet in an insertion direction perpendicular to the direction of movement of the carriage ( 25 ) between the two carrier units ( 17 , 39 ),
• 2. - A serging device ( 11 ) with a displaceable frame ( 91 ) which is arranged in the direction of insertion of the pallet behind the carriage and comprises a plurality of cutting bodies ( 159 ) carrying arms ( 90 ) which are used to cut off the welding beads between the upper and lower parts of the pallet the insertion direction of which can be pushed, the cutting bodies ( 159 ) being connected to retractable and retractable cutting blades ( 160 ) and the arms ( 90 ) at the same time being guided vertically on the frame ( 91 ), and
• 3. - In addition to the displaceable frame ( 91 ) of the serging device ( 11 ) parallel to the first pallet transport device ( 19 ) offset arranged second pallet transport device ( 21 ) for removal of the processed pallet.

2. Device according to claim 1, wherein the first pallet transport device ( 19 ) and the second pallet transport device ( 21 ) each consist of roller tracks. 3. The device according to claim 1, wherein the advancement and retraction of the carriage ( 25 ) and the displaceable carrier unit ( 39 ) is effected by pneumatic working cylinders ( 30 and 43 ). 4. The device according to claim 1, wherein a rotatable shaft ( 49 ) which is rotatably mounted on the displaceable carrier unit ( 39 ) and on the front side of which a rotatable pallet ( 37 ) is fastened is driven by a motor ( 61 ). 5. The apparatus of claim 1, wherein a rotatable plate ( 37 ) is fixedly attached to the front of a rotatable shaft ( 49 ) movably mounted on the displaceable carrier unit ( 39 ) and with four substantially equal distances from the rotatable shaft ( 49 ) holes ( 67 ) is provided and a push-back and push-back holding pin ( 69 ) on the sliding support unit ( 39 ) is attached so that the front of the holding pin ( 69 ) in one of the holes ( 67 ) on the rotating plate ( 37 ) takes effect when this is pushed forward. 6. The device according to claim 1, wherein the first pallet transport device ( 19 ) comprises pneumatic working cylinders ( 83 ) which are held by the frame ( 35 ) of the device ( 15 ) for rotating the pallet and a frame ( 79 ) of the supporting unit ( 17 ) and the pistons ( 85 ) of these pneumatic working cylinders ( 83 ) are fastened to a roller holding frame ( 89 ) provided with a plurality of rollers ( 87 ). 7. The device according to claim 1, wherein a device ( 20 ) for pushing and retracting the cutting blades ( 160 ) in the Versäuberungsein direction ( 11 ) comprises a guide member ( 103 ) which slidably engages in guide rails ( 101 ), and a displaceable Support plate ( 100 ) which is attached to this guide member ( 103 ), the movable frame ( 91 ) being held by this displaceable support plate ( 100 ),
Guide rollers ( 95 ) attached to the lower end of the movable frame ( 91 ) by means of brackets ( 93 ), and
a rail ( 97 ) which is designed parallel to the guide rails ( 101 ) between these guide rollers ( 95 ), the movable frame ( 91 ) being connected on the outside to a chain ( 105 ) driven by a motor ( 107 ). 8. The device according to claim 7, wherein four arms ( 123-126 ) on this be movable frame ( 91 ) are vertically displaceably fastened, each of the arms having a cutting blade ( 160 ) on its front side and a cutting tool bearing ( 123 b - 126 b) at its rear end, each of these cutting tool bearings being fastened in the vertical direction to the movable frame ( 91 ) and to ball screw nuts ( 135 , 137 , 150 , 149 ) which are threaded in ball screw assemblies ( 130 , 131 , 141 , 143 ) which are driven independently of each other. 9. The device according to claim 7, wherein the chain ( 105 ) attached to the outside of the movable frame ( 91 ) is wound around a toothed wheel ( 115 ) which is fastened to the carrier ( 113 ) which extends from a base plate ( 23 ) he lifts and around a gear ( 111 ) which is attached to a rotatable shaft ( 110 ) which is driven by a motor ( 107 ). 10. A welding bead removing device for a device according to any one of claims 1-9, comprising:
an arm ( 124 ) capable of vertical and horizontal movements,
a lever ( 163 ), the rear end of which is rotatably attached to this arm ( 124 ), the front of this lever ( 163 ) being interchangeably mounted in a holder ( 161 ) which holds a replaceable cutting blade ( 160 ), said holder ( 161 ) is provided with a guide roller ( 175 ), and a tension spring which is brought between the guide roller ( 175 ) and the lever ( 163 ). 11. The cutting device of claim 10, wherein a sensor ( 176 ) is mounted near the rear end of the lever ( 163 ) to determine that the lever is within the holding frame ( 157 ).