Scar scraping equipment in longitudinal welded pipe

Abstract

The longitudinal welded pipe inner scar scraping device comprises a working table, a front limiting block, a side limiting block, an acting cylinder, a pin shaft support, a screw rod and a scraper vehicle body, four bottom wheels are arranged at the bottom of the scraper vehicle body, two T-shaped grooves are vertically formed in the tops of the two sides of the scraper vehicle body respectively, and each T-shaped groove is correspondingly connected with a T-shaped block in a guiding and sliding mode. The bottom end of the T-shaped block can be locked on the T-shaped groove through a locking structure, and a top wheel is arranged at the top end of the T-shaped block; the four top wheels and the four bottom wheels are respectively positioned on the top surface and the bottom surface of the inner hole of the welded square tube needing to be scratched in a rolling manner; the scraper body is obliquely arranged in a left-high and right-low mode, the back face of the scraper can lean against the inclined face of the bottom of the scraper body, and a tool bit at the bottom end of the scraper scrapes welding seam burrs. The internal scar scraping device can be used for performing internal scar scraping on port parts of welded square pipes of various specifications, so that the working efficiency is improved, and the input cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of steel pipe scraping, in particular to a straight seam welded pipe internal scraping device. Background Art

[0002] During the high-frequency welding process of welded steel pipes, the temperature of the weld seam will rise instantly due to the high-frequency induction. The edge of the strip steel at the weld seam will reach a solid solution state, and then the steel pipe will be formed through extrusion and smelting. However, peach-shaped burrs will also be generated inside and outside the weld seam during the extrusion process. The burrs outside the pipe and inside the pipe need to be removed by an external scraper and an internal scraper respectively. In the past, the internal scraper mainly consisted of a pull rod part and a scraper part, and the scraper part consisted of a cutter head mechanism, a guide mechanism, a retracting mechanism, a feed positioning mechanism, and a scraper bracket. This internal scraper is suitable for integration in a welding production line, that is, scraping while welding.

[0003] However, some welded pipes, such as welded square pipes used as brackets for equipment or infrastructure, do not need to be scraped all the way inside. It is only necessary to remove the weld scars within a certain length of the pipe end, and to put in the end plugging cap or insert the guide rod of the inner hole section. In order to remove the weld scars of a certain length of the pipe end, if online removal is used, not only complex equipment is required, but also production efficiency is seriously affected. Offline removal lacks special equipment, and offline manual removal is naturally slow and inefficient.

[0004] When the applicant was conducting preliminary research, he searched and found an invention patent with publication number CN115351357A, which is an offline rectangular welded pipe end internal scraping device, which is composed of a frame, a scraper part, a positioning part, and a driving part. The positioning part and the driving part are both arranged on the frame, and the scraper part is hingedly connected to the driving part. The driving part is composed of a screw bracket, a cylinder seat, a driving cylinder, and a limit bar. The screw bracket is fixedly mounted on the top surface of the frame, the cylinder seat is arranged on the screw bracket, the driving cylinder is fixedly mounted on the cylinder seat, and the limit bar is arranged on the cylinder seat to drive the cylinder. On both sides, the positioning part is composed of a steel pipe bracket, a first positioning block, and a second positioning block. The steel pipe bracket is arranged at a position adjacent to the frame. The first positioning block and the second positioning block are divided into front and rear steel pipe brackets coaxially arranged on the top surface of the frame. The scraper part is composed of a scraper handle, a scraper, a first support roller group, a second support roller group, and a scraper adjustment screw. The scraper handle is hingedly connected to the driving oil cylinder. The scraper is arranged at the lower part of the scraper handle. The first support roller group and the second support roller group are arranged side by side at the upper part of the scraper handle. The scraper adjustment screw and the scraper are arranged in the middle of the scraper handle relative to the scraper. This patented technical solution can remove the internal scars of the weld at the end of the welded square tube, which basically solves the problem of slow speed and low efficiency of offline scar removal. However, since the distance between the support roller group and the scraper part cannot be adjusted, it can only scrape the inner scars of a square tube with a certain height specification. The applicant needs to deal with the internal scars at the ports of square tubes of different specifications for a long time. If multiple sets of equipment in this patented solution are prepared, it will obviously invest more equipment costs and occupy a larger processing workshop space.

[0005] Therefore, it is necessary to develop a scar scraping device inside a straight seam welded pipe to overcome the above-mentioned defects. Utility Model Content

[0006] The utility model aims to provide a straight seam welded pipe internal scraping device, which can scrape the internal scars of the end parts of welded square pipes of various specifications, thereby improving the operation efficiency and reducing the investment cost.

[0007] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0008] The utility model discloses a scar scraping device for straight seam welded pipe, comprising a workbench, a front limit block, a side limit block, an action cylinder, a pin shaft support, a screw and a scraper body, wherein four bottom wheels are arranged at the bottom of the scraper body, and two T-slots are respectively arranged vertically at the tops of both sides of the scraper body, each of which is connected to a T-block corresponding to a guide slide, and the bottom end of the T-block can be locked on the T-slot through a locking structure, and a top wheel is arranged on the outer side of the top end of the T-block; the four top wheels and the four bottom wheels are respectively rolled and positioned on the top surface and the bottom surface of the inner hole of the welded square pipe that needs to be scraped; the pin shaft at the rear end of the scraper body is connected to the piston rod end of the action cylinder, and the pin shaft at the rear end of the scraper body is connected to the top end of the scraper, the scraper main body is tilted high on the left and low on the right, and the back of the scraper can lean against the inclined surface of the bottom of the scraper body, and the blade head at the bottom end of the scraper scrapes off the burrs in the weld of the welded square pipe.

[0009] Furthermore, there are two side limit blocks, which are arranged in parallel on the top surface of the workbench on the left side of the front limit block; the side limit block is a U-shaped structure with its opening facing upward, and the opening width of the side limit block is larger than the welded square tube. The upper part of the vertical plate of the side limit block is threadedly connected with a first top screw, and the inner end of the first top screw abuts against the side wall of the welded square tube.

[0010] Furthermore, the locking structure includes two second top screws at different heights, the second top screws are threadedly connected to the threaded holes at the bottom end of the T-block, and the inner ends of the second top screws can be pressed tightly against the bottom surface of the T-slot.

[0011] Furthermore, the top wheel is connected to the top side wall of the T-block through the support shaft of the inner ring, and the mounting screw passes through the hole in the support shaft and is connected to the threaded hole of the T-block.

[0012] Furthermore, a lug with a narrowed width is provided at the rear of the scraper body, and the rear of the lug is connected to the piston rod end of the cylinder via a pin; the bottom of the lug is connected to the top of the scraper via a pin, and the inclined surface is provided between the two ear plates of the lug.

[0013] Furthermore, a chip breaker groove is provided in front of the scraper.

[0014] Compared with the prior art, the beneficial technical effects of the utility model are:

[0015] The utility model discloses a device for scraping scars inside straight seam welded pipes. By setting a T-slot and a T-block, a top wheel is installed on the outside of the top end of the T-block, so that the height position of the top wheel can be adjusted, thereby adapting to welded square pipes of different height specifications, ensuring that the device can remove scars inside the ports of welded square pipes of various specifications; by setting four top wheels and four bottom wheels to limit the height direction, the device has good stability, does not cut too much or too little, and has a good scar removal effect. By setting a pin to install the top end of the scraper, the scraper can swing around the top pin, which is convenient for feeding in the empty stroke without scratching. The utility model discloses a device for scraping scars inside straight seam welded pipes, which can scrape scars inside the ports of welded square pipes of various specifications, thereby improving work efficiency and reducing investment costs.

[0016] In addition, by setting the first top screw on the vertical plate of the side limit block of the U-shaped structure, it can be suitable for welding square tubes of different widths on the one hand, and on the other hand, it can ensure that the clamping position on both sides of the welding square tube is adjustable, thereby ensuring that the scraper position and the weld position of the welding square tube are aligned in the center; by setting two spaced-apart side limit blocks, the welding square tube is limited front and back to avoid front and back tilting when the welding square tube is clamped. The bottom end of the T-block is stretched and pressed by the second top screws at two different height positions, which has good stability and connection strength, and avoids the loosening of the T-block during the scar removal process of the action cylinder return stroke. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the main structure of the internal scar scraping device of the straight seam welded pipe of the utility model;

[0019] Figure 2 It is a partial cross-sectional front view of the internal scar scraping device of the straight seam welded pipe of the utility model;

[0020] Figure 3 It is a schematic diagram of the top view of the structure of the internal scar scraping device of the straight seam welded pipe of the utility model;

[0021] Figure 4 for Figure 2 A schematic diagram of the partial enlarged structure of the middle I part;

[0022] Figure 5 The utility model is a schematic diagram of the scraper body part viewed from above.

[0023] Explanation of the accompanying reference numerals: 1. workbench; 2. front limit block; 3. side limit block; 301. first top screw; 4. action cylinder; 5. pin support; 6. screw; 7. scraper body; 701. bottom wheel; 702. support ear; 703. T-slot; 704. inclined surface; 8. scraper; 9. T-block; 10. top wheel; 11. mounting screw; 12. second top screw; 13. welded square tube. DETAILED DESCRIPTION

[0024] The core of the utility model is to provide a straight seam welded pipe internal scraping device, which can scrape the internal scars of the end parts of welded square pipes of various specifications, thereby improving the working efficiency and reducing the investment cost.

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0027] With reference to the accompanying drawings, Figure 1 This is a schematic diagram of the main structure of the internal scar scraping device of the straight seam welded pipe of the utility model; Figure 2 It is a partial cross-sectional front view of the internal scar scraping device of the straight seam welded pipe of the utility model; Figure 3 It is a schematic diagram of the top view of the structure of the internal scar scraping device of the straight seam welded pipe of the utility model; Figure 4 for Figure 2 A schematic diagram of the partial enlarged structure of the middle I part; Figure 5 The utility model is a schematic diagram of the scraper body part viewed from above.

[0028] In a specific embodiment, Figures 1 to 5As shown, the scar scraping device for straight seam welded pipe of the utility model comprises a workbench 1, a front limit block 2, a side limit block 3, an action cylinder 4, a pin support 5, a screw 6 and a scraper body 7. The pin support 5 supports the pin in the middle of the cylinder body of the action cylinder 4. The pin support 5 is supported and installed on the workbench 1 by four screws 6, and each screw 6 is respectively installed with a nut on the upper and lower surfaces of the bottom plate of the pin support 5, that is, the height of the pin support 5 can be adjusted, that is, the height of the action cylinder 4 can be adjusted. The action cylinder 4 can be selected as a pneumatic cylinder or a hydraulic cylinder. The end of the piston rod 401 of the action cylinder 4 is inserted into the square hole of the welded square pipe 13 where the weld scar needs to be scraped and connected to the scraper body 7. There is a concave platform on the left side of the top surface of the front limit block 2, and the side wall of the concave platform abuts against the bottom wall of the welded square pipe 13 and does not exceed the thickness of the bottom wall. The side limit blocks 3 are centered on the front and rear sides of the welded square tube 13. The longer welded square tube 13 requires an auxiliary bracket independent of the device, which is not shown in the attached drawings.

[0029] The important innovation of the utility model compared with the existing port scar removal equipment is as follows: four bottom wheels 701 are arranged at the bottom of the scraper body 7, and two T-slots 703 are vertically arranged on the top of both sides of the scraper body 7, that is, there are four T-slots 703 for guiding. Each T-slot 703 corresponds to a T-block 9 connected to the guide sliding, and the bottom end of the T-block 9 can be locked on the T-slot 703 through a locking structure. A rolling top wheel 10 is arranged on the outer side of the top of the T-block 9. The four top wheels 10 and the four bottom wheels 701 are respectively rolled and positioned on the top and bottom surfaces of the inner hole of the welded square tube 13 that needs to be scraped, that is, the top wheel 10 and the bottom wheel 701 are limited in height position. The rear pin shaft of the scraper body 7 is connected to the end of the piston rod 401 of the acting cylinder 4, and the rear pin shaft of the scraper body 7 is connected to the top of the scraper 8, that is, the scraper 8 can swing around the top pin shaft. Figure 2 and Figure 4 As shown, the scraper 8 body is tilted with the left side higher and the right side lower, and the back of the scraper 8 can be tilted against the inclined surface 704 at the bottom of the scraper body 7. The bottom end of the scraper 8 corresponds to the weld position of the welded square tube 13, and scrapes away the burrs in the weld of the welded square tube 13.

[0030] By setting the T-slot 70 and the T-block 9, the top wheel 10 is installed on the outside of the top of the T-block 9, which can adjust the height position of the top wheel 10, thereby adapting to the welded square tubes 13 of different height specifications, ensuring that the equipment can remove scars from the ports of welded square tubes 13 of various specifications; by setting four top wheels 10 and four bottom wheels 701 to limit the height direction, the stability is good, and there will be no over-cutting or under-cutting, and the scar removal effect is good. By setting the top of the scraper 8 to install the pin shaft, the scraper 8 can swing around the top pin shaft, which is convenient for feeding in the empty stroke without scratching. The utility model of the straight seam welded pipe internal scar scraping equipment can scrape scars from the ports of welded square tubes of various specifications, improves the working efficiency, and reduces the investment cost.

[0031] In a specific embodiment of the present invention, Figure 1 and Figure 3 As shown, there are two side limit blocks 3, and the two side limit blocks 3 are arranged in parallel on the top surface of the workbench 1 on the left side of the front limit block 2. The side limit block 3 is a U-shaped structure with an opening facing upward, and the opening width of the side limit block 3 is larger than the welded square tube 13. The upper part of the vertical plate of the side limit block 3 is threadedly connected with a first top screw 301, and the inner end of the first top screw 301 abuts against the side wall of the welded square tube 13.

[0032] By setting the first top screw 301 on the vertical plate of the side limit block 3 of the U-shaped structure, on the one hand, it can be suitable for welding square tubes 13 of different widths, and on the other hand, it can ensure that the front and rear clamping positions of the welding square tube 13 are adjustable, thereby ensuring that the position of the scraper 8 and the weld position of the welding square tube 13 are centered and aligned; by setting two spaced-apart side limit blocks 3, the welding square tube 13 is limited front and back, avoiding the front and back tilting of the welding square tube 13 when being clamped.

[0033] In a specific embodiment of the present invention, Figure 2 and Figure 4 As shown, the locking structure includes two second top screws 12 at different heights. The second top screws 12 are threadedly connected to the threaded holes at the bottom end of the T-block 9 , and the inner ends of the second top screws 12 can be pressed tightly against the bottom surface of the T-slot 703 .

[0034] Obviously, the locking structure can also be locked by bolts, that is, multiple threaded holes of different heights are opened on the bottom surface of the T-slot 703, through holes are opened on the T-block 9, bolts pass through the through holes to connect the threaded holes, and the T-block 9 is fixed and locked. This method can also adapt to welded square pipes 13 of different height specifications. Similar simple transformation methods all fall within the protection scope of the utility model.

[0035] The bottom end of the T-block 9 is stretched and pressed by the second top screws 12 at two different heights, which has good stability and connection strength, and avoids the loosening of the T-block 9 during the scar removal process of the return stroke of the acting cylinder 4.

[0036] Specifically, if Figure 4 and Figure 5 As shown, the top wheel 10 is connected to the top side wall of the T-block 9 through the support shaft of the inner ring, and the mounting screw 11 passes through the hole in the support shaft and is connected to the threaded hole of the T-block 9.

[0037] Specifically, the top wheel 10 and the bottom wheel 701 are both made of deep groove ball bearings. The inner ring of the top wheel 10 is mounted on the support shaft, and the bottom of the scraper body 7 is fixedly connected to the wheel shaft by screws, and the bottom wheels 701 are respectively mounted on both ends of the wheel shaft.

[0038] In a specific embodiment of the present invention, Figure 4 and Figure 5 As shown, the rear of the scraper body 7 is provided with a lug 702 with a narrowed width in the middle, and the rear of the lug 702 is connected to the end of the piston rod 401 of the cylinder 4 through a pin, and the end of the piston rod 401 is provided with a flattened pin mounting platform. The bottom of the lug 702 is connected to the top of the scraper 8 through a pin, and the top of the scraper 8 is an arc surface that does not affect its swing. The inclined surface 704 is provided between the two ear plates of the lug 702.

[0039] Specifically, if Figure 4 and Figure 5 As shown, the front of the scraper 8 is provided with a chip breaker groove.

[0040] The support lug 702 is provided to facilitate the connection between the end of the piston rod 401 and the top of the pin-connected scraper 8, so that the width of the scraper 8 can be controlled within a smaller range, reducing the possibility of accidental damage to the bottom wall. By providing a chip breaker groove near the tip of the scraper 8 in front of the material, it is possible to prevent the iron chips from being too long and entangled, making it easier to clean.

[0041] The working process of the internal scar scraping device of the utility model is as follows: first, the welded square tube 13 to be scraped is placed horizontally with the aid of an auxiliary bracket, with the weld seam at one end to be processed facing downward and the right end face abutting against the side vertical wall of the concave platform of the front limit block 2. Use a wrench to adjust the ejection length of the inner end of the first top screw 301 of the side limit block 3, so that the position of the scraper 8 and the weld seam position of the welded square tube 13 are centered and aligned, and the axis of the welded square tube 13 is parallel to the cylinder 4. By adjusting the position of the nut on the screw 6, the height of the bottom plate of the pin support 5 is adjusted, so that the four bottom wheels 701 at the bottom of the scraper body 7 can all contact the bottom wall of the inner hole of the welded square tube 13 horizontally, and the piston rod 401 is ejected and withdrawn for inspection. According to the height of the welded square tube 13, the height position of the top wheel 10 is adjusted. When adjusting, loosen the second top screw 12, and manually adjust the height of the T-block 9 so that the outer edge spacing of the top wheel 10 and the bottom wheel 701 is consistent with the height of the square hole of the welded square tube 13. The button of the electric control box of the control device is operated to make the cylinder 4 start to push out, and the scraper body 7 slowly enters the set depth of the welded square tube 13. During the entry process, the back of the scraper 8 contacts the weld scar of the welded square tube 13, and the bottom of the scraper 8 swings upward to make way, and no hard scraping occurs. After reaching the set penetration depth, the button of the electric control box of the control device is operated to make the cylinder 4 start to retreat, and the piston rod 401 pulls the scraper body 7 to move slowly outward. During this process, the scraper 8 swings back to the inclined surface 704 and starts to cut, scraping the weld scar.

[0042] In summary, the utility model straight seam welded pipe internal scraping equipment can adjust the height position of the top wheel 10 through the arrangement of the T-slot 70 and the T-block 9, and the top wheel 10 is installed on the top outer side of the T-block 9, so as to adapt to the welded square tubes 13 of different height specifications, ensuring that the equipment can remove scars from the ports of welded square tubes 13 of various specifications; by setting four top wheels 10 and four bottom wheels 701 to limit the height direction, the equipment has good stability, and there will be no over-cutting or under-cutting, and the scar removal effect is good. By setting the top of the scraper 8 to be installed with a pin shaft, the scraper 8 can swing around the top pin shaft, which is convenient for feeding in the empty stroke without scratching. The utility model straight seam welded pipe internal scraping equipment can scrape scars from the ports of welded square tubes of various specifications, thereby improving the working efficiency and reducing the investment cost. In addition, by setting the first top screw 301 on the vertical plate of the side limit block 3 of the U-shaped structure, on the one hand, it can be applied to the welding square tube 13 of different widths, and on the other hand, it can also ensure that the clamping position of the front and rear sides of the welding square tube 13 is adjustable, thereby ensuring that the position of the scraper 8 and the weld position of the welding square tube 13 are aligned in the center; by setting two spaced side limit blocks 3 to limit the front and rear of the welding square tube 13, the front and rear tilting of the welding square tube 13 is avoided when the welding square tube 13 is clamped. The bottom end of the T-block 9 is stretched and pressed by the second top screws 12 at two different height positions, which has good stability and connection strength, and avoids the loosening of the T-block 9 during the scar removal process of the action cylinder 4. By setting the support ear 702, it is convenient to connect the end of the piston rod 401 and the top of the pin shaft to connect the scraper 8, so that the width of the scraper 8 can be controlled within a smaller range, reducing the accidental damage to the bottom wall. By setting a chip breaker groove near the tip of the scraper 8 in front of the material, it can avoid that the iron chips are too long and will not be entangled, which is convenient for cleaning.

[0043] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0044] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A scar scraping device for a straight seam welded pipe, comprising a workbench (1), a front limit block (2), a side limit block (3), an action cylinder (4), a pin support (5), a screw (6) and a scraper body (7), characterized in that: The bottom of the scraper body (7) is provided with four bottom wheels (701), and two T-shaped slots (703) are respectively vertically provided on the top of both sides of the scraper body (7), and each of the T-shaped slots (703) is connected to a T-shaped block (9) in a corresponding guide sliding manner, and the bottom end of the T-shaped block (9) can be locked on the T-shaped slot (703) through a locking structure, and a top wheel (10) is provided on the outer side of the top end of the T-shaped block (9); the four top wheels (10) and the four bottom wheels (701) are respectively moved when needed. The scraper (8) is rolled and positioned on the top and bottom surfaces of the inner hole of the welded square tube (13) for scraping scars; the tail pin of the scraper body (7) is connected to the end of the piston rod (401) of the acting cylinder (4), and the tail pin of the scraper body (7) is connected to the top of the scraper (8); the scraper (8) body is tilted with the left side higher and the right side lower; the back of the scraper (8) can be tilted against the inclined surface (704) at the bottom of the scraper body (7), and the bottom end of the scraper (8) scrapes away the burrs in the weld of the welded square tube (13).

2. The internal scar scraping device of the straight seam welded pipe according to claim 1 is characterized in that: The number of the side limit blocks (3) is two, and the two side limit blocks (3) are arranged in parallel on the top surface of the workbench (1) on the left side of the front limit block (2); the side limit block (3) is a U-shaped structure with an opening facing upward, the opening width of the side limit block (3) is larger than the welded square tube (13), and the upper part of the vertical plate of the side limit block (3) is threadedly connected with a first top screw (301), and the inner end of the first top screw (301) abuts against the side wall of the welded square tube (13).

3. The internal scar scraping device of the straight seam welded pipe according to claim 1 is characterized in that: The locking structure comprises two second top screws (12) at different heights, wherein the second top screw (12) is threadedly connected to a threaded hole at the bottom end of the T-block (9), and the inner end of the second top screw (12) can be pressed tightly against the bottom surface of the T-slot (703).

4. The internal scar scraping device of the straight seam welded pipe according to claim 3 is characterized in that: The top wheel (10) is connected to the top side wall of the T-block (9) via the inner ring support shaft, and the mounting screw (11) passes through the hole in the support shaft and is connected to the threaded hole of the T-block (9).

5. The internal scar scraping device of the straight seam welded pipe according to claim 1 is characterized in that: The rear end of the scraper body (7) is provided with a lug (702) with a narrowed width in the middle, and the rear end of the lug (702) is connected to the end of the piston rod (401) of the cylinder (4) via a pin; the bottom of the lug (702) is connected to the top of the scraper (8) via a pin, and the inclined surface (704) is provided between two ear plates of the lug (702).

6. The internal scar scraping device of the straight seam welded pipe according to claim 5 is characterized in that: A chip breaker groove is arranged in front of the scraper (8).

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