Laser engraving blanking machine

Abstract

The utility model relates to the technical field of laser engraving, in particular to a laser engraving blanking machine which is characterized in that a workpiece which is not subjected to laser engraving is placed on a feeding mechanism, the workpiece which is not subjected to laser engraving is moved to a specified height through the feeding mechanism, then the workpiece which is not subjected to laser engraving is fixed through a limiting mechanism, and then the feeding mechanism is reset. Workpieces which are not subjected to laser engraving are overturned to the position above the supporting mechanism through the limiting mechanism, the workpieces are engraved through the laser engraving machine, then the engraved workpieces are discharged through the cooperation of the discharging mechanism and the limiting mechanism, and therefore the practicability of the equipment is improved. Comprising a supporting mechanism; the device further comprises a limiting mechanism, a feeding mechanism and a discharging mechanism, and the limiting mechanism, the feeding mechanism and the discharging mechanism are all installed on the supporting mechanism. The supporting mechanism supports the laser engraving machine, the feeding mechanism conveys workpieces which are not subjected to laser engraving, the limiting mechanism fixes the workpieces which are not subjected to laser engraving, and the discharging mechanism conveys the engraved workpieces.

Description

Technical Field

[0001] The utility model relates to the technical field of laser engraving, in particular to a laser engraving blanking machine. Background Art

[0002] A laser engraving machine is a device that uses a laser beam to cut, engrave or mark materials. Existing laser engraving machines, such as the multi-station laser engraving machine disclosed in the utility model patent publication number CN220782585U and the laser engraving machine disclosed in the utility model patent publication number CN218050848U, can both perform laser engraving on workpieces.

[0003] However, it was found during use that the existing laser engraving machine has a relatively simple structure, which is inconvenient for loading and unloading, affecting the laser engraving efficiency and resulting in poor practicality. Therefore, a laser engraving unloading machine is urgently needed to improve the above problems. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a laser engraving blanking machine which places an un-laser-engraved workpiece on a loading mechanism, moves the un-laser-engraved workpiece to a specified height through the loading mechanism, fixes the un-laser-engraved workpiece through a limiting mechanism, then resets the loading mechanism, flips the un-laser-engraved workpiece over to the top of a supporting mechanism through the limiting mechanism, enables a laser engraving machine to engrave it, and then discharges the engraved workpiece through a discharging mechanism in cooperation with the limiting mechanism, thereby improving the practicality of the equipment.

[0005] The utility model provides a laser engraving blanking machine, comprising a supporting mechanism; a limiting mechanism, a feeding mechanism and a discharging mechanism, wherein the limiting mechanism, the feeding mechanism and the discharging mechanism are all mounted on the supporting mechanism;

[0006] The support mechanism supports the laser engraving machine, the loading mechanism transports the workpiece that has not been laser engraved, the limiting mechanism fixes the workpiece that has not been laser engraved, and the discharge mechanism transports the engraved workpiece;

[0007] The unengraved workpiece is placed on the loading mechanism, moved to a specified height by the loading mechanism, fixed by the limiting mechanism, and then reset by the loading mechanism. The unengraved workpiece is flipped over to the top of the supporting mechanism by the limiting mechanism, engraved by the laser engraving machine, and then discharged by the discharge mechanism in cooperation with the limiting mechanism, thereby improving the practicality of the equipment.

[0008] Preferably, the supporting mechanism includes a workbench, a loading door, multiple sets of slide grooves and multiple sets of mounting tables. The loading door is installed at the front end of the workbench, and the multiple sets of mounting tables are installed at the top of the workbench. The multiple sets of mounting tables are respectively slidably installed on the multiple sets of slide grooves, and the multiple sets of mounting tables are respectively fixed on the multiple sets of slide grooves by multiple sets of bolts. Multiple sets of threaded holes are provided on the multiple sets of mounting tables; by sliding the multiple sets of mounting tables, the distance between the multiple sets of mounting tables on the left and right sides is adjusted, and the multiple sets of mounting tables are respectively fixed on the multiple sets of slide grooves by multiple sets of bolts, and then the laser engraving machine is installed on the multiple sets of mounting tables, thereby improving the practicality of the equipment.

[0009] Preferably, the limiting mechanism includes an engraving table, two groups of rotating shafts, multiple groups of first suction cups, multiple groups of second suction cups, a driving motor, a gear, a gear ring and a guide mechanism. A chamber is provided inside the workbench, and a reserved opening is provided on the top of the workbench. The engraving table is rotatably mounted on the top of the workbench through the two groups of rotating shafts, and the engraving table is located in the reserved opening of the workbench. Multiple groups of first suction cups and multiple groups of second suction cups are respectively mounted on the top and bottom of the engraving table. The driving motor is mounted on the rear end of the workbench, the gear is mounted on the output shaft of the driving motor, the gear ring is sleeved on the rear rotating shaft, and the gear is meshed with the gear ring, and the guide mechanism is mounted on the engraving table; the loading material is sucked by the multiple groups of second suction cups For the workpiece that has not been laser engraved on the mechanism, the drive motor is turned on, and the gear and the gear ring are engaged to drive the engraving table to flip 180 degrees, and the workpiece that has not been laser engraved is flipped to the top of the workbench. The workpiece that has not been laser engraved is then laser engraved by the laser engraving machine. After the engraving is completed, the drive motor is run to make the engraving table continue to flip, and at the same time, multiple groups of second suction cups release the laser engraved workpiece, and the engraved workpiece is guided by the guide mechanism, and the engraved workpiece is discharged in conjunction with the discharge mechanism, and then another group of non-laser engraved workpieces are sucked by the multiple groups of first suction cups flipped to the bottom, and the above workpieces are repeated to continue laser engraving, thereby improving the practicality of the equipment.

[0010] Preferably, the guiding mechanism includes multiple groups of electric cylinders, two groups of brackets and multiple groups of guide wheels, one end of the multiple groups of electric cylinders is respectively installed on the top and bottom ends of the engraving table, the two groups of brackets are respectively installed on the other end of the multiple groups of electric cylinders, and the multiple groups of guide wheels are respectively installed on the two groups of brackets; after the multiple groups of second suction cups release the workpiece after laser engraving, the multiple groups of electric cylinders on one side of the multiple groups of second suction cups are extended to make the multiple groups of guide wheels on one side of the multiple groups of second suction cups support the workpiece after laser engraving, and as the engraving table tilts, the multiple groups of guide wheels tilt to discharge the workpiece after laser engraving onto the discharge mechanism; after the multiple groups of first suction cups release the workpiece after laser engraving, the multiple groups of guide wheels on one side of the multiple groups of first suction cups support the workpiece after laser engraving, and the above steps are repeated to discharge the workpiece after laser engraving onto the discharge mechanism.

[0011] Preferably, the discharge mechanism includes a discharge plate, rollers and a buffer pad, a discharge port is provided at the side end of the workbench, the discharge plate is obliquely installed on the discharge port of the workbench, multiple sets of rollers are installed on the top of the discharge plate, and the buffer pad is installed on the right part of the discharge plate; through the tilt of the engraving table and the support of multiple sets of guide wheels, the workpiece after laser engraving falls onto the multiple sets of rollers, and the workpiece after laser engraving is guided by the multiple sets of rollers, and the workpiece after laser engraving is discharged to the outside of the workbench, and then the workpiece after laser engraving is blocked by the buffer pad, thereby improving the practicality of the equipment.

[0012] Preferably, the loading mechanism includes a hydraulic cylinder, a lifting platform, a two-way hydraulic cylinder, two sets of splints and a baffle. The hydraulic cylinder is installed at the bottom end of the workbench, the lifting platform is installed at the top of the hydraulic cylinder, the two-way hydraulic cylinder is installed at the bottom of the lifting platform, the two sets of splints are respectively installed on the two ends of the two-way hydraulic cylinder, and the baffle is installed on the top of the lifting platform; the workpiece that is not laser engraved is placed on the top of the lifting platform, and the rear end of the workpiece that is not laser engraved is limited by the baffle, and then the baffle is contracted to make the two sets of splints move relative to each other, and the workpiece that is not laser engraved is moved to the center position of the lifting platform, and then extended by the hydraulic cylinder, so as to facilitate multiple sets of first suction cups or multiple sets of second suction cups to adsorb the workpiece that is not laser engraved, thereby improving the practicality of the equipment.

[0013] Preferably, the two sets of rotating shafts and the engraving table are provided with through holes inside, which facilitates the installation of pipelines of multiple sets of first suction cups and multiple sets of second suction cups and circuits of multiple sets of electric cylinders, thereby improving the practicality of the equipment.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the workpiece that has not been laser engraved is placed on the loading mechanism, the workpiece that has not been laser engraved is moved to a specified height by the loading mechanism, and then the workpiece that has not been laser engraved is fixed by the limiting mechanism. After that, the loading mechanism is reset, and the workpiece that has not been laser engraved is flipped over to the top of the supporting mechanism by the limiting mechanism, and is engraved by the laser engraving machine, and then the engraved workpiece is discharged by the discharge mechanism in cooperation with the limiting mechanism, thereby improving the practicality of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is an axonometric structural diagram of the present utility model;

[0016] Figure 2 This is a front view structural diagram of the present utility model;

[0017] Figure 3 It is a rear view structural diagram of the utility model;

[0018] Figure 4 This is a schematic diagram of the front cross-sectional structure of the utility model;

[0019] Figure 5 This is an axonometric enlarged structural diagram of the engraving table and rotating shaft of the utility model;

[0020] Figure 6 This is a frontal enlarged structural diagram of the engraving table and rotating shaft of the utility model;

[0021] Figure 7 This utility model Figure 5 A schematic diagram of the enlarged structure of part A;

[0022] Figure 8 It is a front view enlarged cross-sectional structural diagram of the discharge mechanism of the utility model.

[0023] Markings in the attached figure: 1. Workbench; 2. Loading door; 3. Slide; 4. Mounting table; 5. Engraving table; 6. Rotating shaft; 7. First suction cup; 8. Second suction cup; 9. Driving motor; 10. Gear; 11. Gear ring; 12. Electric cylinder; 13. Bracket; 14. Guide wheel; 15. Discharge plate; 16. Roller; 17. Buffer pad; 18. Hydraulic cylinder; 19. Lifting platform; 20. Bidirectional hydraulic cylinder; 21. Clamp; 22. Baffle. DETAILED DESCRIPTION

[0024] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0025] Example 1

[0026] A laser engraving blanking machine includes a supporting mechanism; a limiting mechanism, a feeding mechanism, and a discharging mechanism, wherein the limiting mechanism, the feeding mechanism, and the discharging mechanism are all mounted on the supporting mechanism;

[0027] The support mechanism supports the laser engraving machine, the loading mechanism transports the workpiece that has not been laser engraved, the limiting mechanism fixes the workpiece that has not been laser engraved, and the discharge mechanism transports the engraved workpiece;

[0028] The support mechanism includes a workbench 1, a loading door 2, multiple sets of slide grooves 3 and multiple sets of mounting platforms 4. The loading door 2 is installed at the front end of the workbench 1. The multiple sets of mounting platforms 4 are all installed on the top of the workbench 1. The multiple sets of mounting platforms 4 are respectively slidably installed on the multiple sets of slide grooves 3, and the multiple sets of mounting platforms 4 are respectively fixed on the multiple sets of slide grooves 3 by multiple sets of bolts. Multiple sets of threaded holes are provided on the multiple sets of mounting platforms 4.

[0029] The limiting mechanism includes an engraving table 5, two sets of rotating shafts 6, multiple sets of first suction cups 7, multiple sets of second suction cups 8, a driving motor 9, a gear 10, a gear ring 11 and a guide mechanism. The interior of the workbench 1 is provided with a chamber, and the top of the workbench 1 is provided with a reserved opening. The engraving table 5 is rotatably mounted on the top of the workbench 1 through the two sets of rotating shafts 6, and the engraving table 5 is located in the reserved opening of the workbench 1. Multiple sets of first suction cups 7 and multiple sets of second suction cups 8 are respectively mounted on the top and bottom ends of the engraving table 5. The driving motor 9 is mounted on the rear end of the workbench 1, the gear 10 is mounted on the output shaft of the driving motor 9, the gear ring 11 is sleeved on the rear rotating shaft 6, and the gear 10 is meshed with the gear ring 11. The guide mechanism is mounted on the engraving table 5;

[0030] The guide mechanism includes multiple sets of electric cylinders 12, two sets of brackets 13 and multiple sets of guide wheels 14. One end of the multiple sets of electric cylinders 12 is respectively installed on the top and bottom ends of the engraving table 5, the two sets of brackets 13 are respectively installed on the other ends of the multiple sets of electric cylinders 12, and the multiple sets of guide wheels 14 are respectively installed on the two sets of brackets 13.

[0031] The discharge mechanism includes a discharge plate 15, rollers 16 and a buffer pad 17. A discharge port is provided at the side end of the workbench 1. The discharge plate 15 is obliquely mounted on the discharge port of the workbench 1. Multiple groups of rollers 16 are mounted on the top of the discharge plate 15. The buffer pad 17 is mounted on the right side of the discharge plate 15.

[0032] By sliding multiple sets of mounting platforms 4, the spacing between multiple sets of mounting platforms 4 on the left and right sides is adjusted, and multiple sets of mounting platforms 4 are fixed to multiple sets of slide grooves 3 by multiple sets of bolts, and then the laser engraving machine is installed on the multiple sets of mounting platforms 4, and the uncarved workpiece is placed on the top of the lifting platform 19, and the rear end of the uncarved workpiece is limited by the baffle 22, and then the baffle 22 is retracted to make the two sets of clamping plates 21 move relative to each other, and the uncarved workpiece is moved to the center position of the lifting platform 19, and then the hydraulic cylinder 18 is extended, and the uncarved workpiece on the feeding mechanism is sucked by multiple sets of second suction cups 8, and the driving motor 9 is turned on, and the gear 10 is engaged with the gear ring 11 to drive the engraving table 5 to flip 180 degrees, and the uncarved workpiece is flipped to the top of the workbench 1, and then the uncarved workpiece is laser engraved by the laser engraving machine, and at the same time, The multiple sets of first suction cups 7 flipped to the bottom suck another set of unlaser-engraved workpieces. After the engraving is completed, the multiple sets of second suction cups 8 release the laser-engraved workpieces, and the multiple sets of electric cylinders 12 on one side of the multiple sets of second suction cups 8 are extended to make the multiple sets of guide wheels 14 on one side of the multiple sets of second suction cups 8 support the laser-engraved workpieces, and as the engraving table 5 tilts, the multiple sets of guide wheels 14 tilt to discharge the laser-engraved workpieces onto the discharge plate 15, and the laser-engraved workpieces are guided by the multiple sets of rollers 16 to be discharged to the outside of the workbench 1, and then the laser-engraved workpieces are blocked by the buffer pads 17 to complete the unloading, and then the above steps are repeated to move the other set of unengraved workpieces sucked by the multiple sets of first suction cups 7 to the top of the workbench 1, and continue the laser engraving process, thereby improving the practicality of the equipment.

[0033] Example 2

[0034] like Figures 1 to 8 As shown, a laser engraving blanking machine includes a support mechanism; a limiting mechanism, a feeding mechanism and a discharge mechanism, wherein the limiting mechanism, the feeding mechanism and the discharge mechanism are all installed on the support mechanism;

[0035] The support mechanism supports the laser engraving machine, the loading mechanism transports the workpiece that has not been laser engraved, the limiting mechanism fixes the workpiece that has not been laser engraved, and the discharge mechanism transports the engraved workpiece;

[0036] The support mechanism includes a workbench 1, a loading door 2, multiple sets of slide grooves 3 and multiple sets of mounting platforms 4. The loading door 2 is installed at the front end of the workbench 1. The multiple sets of mounting platforms 4 are all installed on the top of the workbench 1. The multiple sets of mounting platforms 4 are respectively slidably installed on the multiple sets of slide grooves 3, and the multiple sets of mounting platforms 4 are respectively fixed on the multiple sets of slide grooves 3 by multiple sets of bolts. Multiple sets of threaded holes are provided on the multiple sets of mounting platforms 4.

[0037] The limiting mechanism includes an engraving table 5, two sets of rotating shafts 6, multiple sets of first suction cups 7, multiple sets of second suction cups 8, a driving motor 9, a gear 10, a gear ring 11 and a guide mechanism. The interior of the workbench 1 is provided with a chamber, and the top of the workbench 1 is provided with a reserved opening. The engraving table 5 is rotatably mounted on the top of the workbench 1 through the two sets of rotating shafts 6, and the engraving table 5 is located in the reserved opening of the workbench 1. Multiple sets of first suction cups 7 and multiple sets of second suction cups 8 are respectively mounted on the top and bottom ends of the engraving table 5. The driving motor 9 is mounted on the rear end of the workbench 1, the gear 10 is mounted on the output shaft of the driving motor 9, the gear ring 11 is sleeved on the rear rotating shaft 6, and the gear 10 is meshed with the gear ring 11. The guide mechanism is mounted on the engraving table 5;

[0038] The guide mechanism includes multiple sets of electric cylinders 12, two sets of brackets 13 and multiple sets of guide wheels 14. One end of the multiple sets of electric cylinders 12 is respectively installed on the top and bottom ends of the engraving table 5, the two sets of brackets 13 are respectively installed on the other ends of the multiple sets of electric cylinders 12, and the multiple sets of guide wheels 14 are respectively installed on the two sets of brackets 13.

[0039] The discharge mechanism includes a discharge plate 15, rollers 16 and a buffer pad 17. A discharge port is provided at the side end of the workbench 1. The discharge plate 15 is obliquely mounted on the discharge port of the workbench 1. Multiple groups of rollers 16 are mounted on the top of the discharge plate 15. The buffer pad 17 is mounted on the right side of the discharge plate 15.

[0040] The feeding mechanism includes a hydraulic cylinder 18, a lifting platform 19, a bidirectional hydraulic cylinder 20, two sets of clamping plates 21 and a baffle 22. The hydraulic cylinder 18 is installed at the bottom end of the workbench 1, the lifting platform 19 is installed at the top of the hydraulic cylinder 18, the bidirectional hydraulic cylinder 20 is installed at the bottom of the lifting platform 19, the two sets of clamping plates 21 are respectively installed on the two ends of the bidirectional hydraulic cylinder 20, and the baffle 22 is installed at the top of the lifting platform 19;

[0041] The two sets of rotating shafts 6 and the engraving table 5 are both provided with through holes;

[0042] By sliding the multiple sets of mounting platforms 4, the spacing between the multiple sets of mounting platforms 4 on the left and right sides is adjusted, and the multiple sets of mounting platforms 4 are fixed to the multiple sets of slide grooves 3 by multiple sets of bolts, and then the laser engraving machine is installed on the multiple sets of mounting platforms 4, the loading door 2 is opened, and the uncarved workpiece is placed on the top of the lifting platform 19, and the rear end of the uncarved workpiece is limited by the baffle 22, and then the baffle 22 is retracted to make the two sets of clamping plates 21 move relative to each other, and the uncarved workpiece is moved to the center position of the lifting platform 19, and then the hydraulic cylinder 18 is extended, and the uncarved workpiece on the loading mechanism is sucked by the multiple sets of second suction cups 8, and the driving motor 9 is turned on, and the gear 10 is engaged with the gear ring 11 to drive the engraving table 5 to flip 180 degrees, and the uncarved workpiece is flipped to the top of the workbench 1, and then the uncarved workpiece is laser engraved by the laser engraving machine. At the same time, by flipping over the multiple groups of first suction cups 7 to the bottom, another group of un-laser-engraved workpieces are sucked. After the engraving is completed, the multiple groups of second suction cups 8 release the laser-engraved workpieces, and the multiple groups of electric cylinders 12 on one side of the multiple groups of second suction cups 8 are extended to make the multiple groups of guide wheels 14 on one side of the multiple groups of second suction cups 8 support the laser-engraved workpieces, and as the engraving table 5 tilts, the multiple groups of guide wheels 14 tilt to discharge the laser-engraved workpieces onto the discharge plate 15, and the laser-engraved workpieces are guided by the multiple groups of rollers 16 to be discharged to the outside of the workbench 1, and then the laser-engraved workpieces are blocked by the buffer pads 17 to complete the unloading, and then the above steps are repeated to move the other group of un-engraved workpieces sucked by the multiple groups of first suction cups 7 to the top of the workbench 1, and continue the laser engraving process, thereby improving the practicality of the equipment.

[0043] The first suction cup 7, the second suction cup 8, the electric cylinder 12, the hydraulic cylinder 18 and the bidirectional hydraulic cylinder 20 of the laser engraving blanking machine of the utility model are purchased on the market. Technicians in this industry only need to install and operate them according to the accompanying instruction manual, without the need for creative labor by technicians in this field.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A laser engraving blanking machine, comprising a support mechanism; characterized in that: It also includes a limiting mechanism, a feeding mechanism and a discharging mechanism, and the limiting mechanism, the feeding mechanism and the discharging mechanism are all installed on the supporting mechanism; The support mechanism supports the laser engraving machine, the loading mechanism transports the workpiece that has not been laser engraved, the limiting mechanism fixes the workpiece that has not been laser engraved, and the discharge mechanism transports the engraved workpiece; The supporting mechanism comprises a workbench (1), a loading door (2), a plurality of slide grooves (3) and a plurality of mounting platforms (4); the loading door (2) is mounted on the front end of the workbench (1); the plurality of mounting platforms (4) are mounted on the top end of the workbench (1); the plurality of mounting platforms (4) are respectively slidably mounted on the plurality of slide grooves (3); and the plurality of mounting platforms (4) are respectively fixedly mounted on the plurality of slide grooves (3) by a plurality of bolts; and the plurality of mounting platforms (4) are each provided with a plurality of threaded holes; The discharge mechanism comprises a discharge plate (15), rollers (16) and a buffer pad (17); a discharge port is provided at the side end of the workbench (1); the discharge plate (15) is obliquely mounted on the discharge port of the workbench (1); multiple groups of rollers (16) are mounted on the top of the discharge plate (15); and the buffer pad (17) is mounted on the right side of the discharge plate (15); The feeding mechanism comprises a hydraulic cylinder (18), a lifting platform (19), a bidirectional hydraulic cylinder (20), two groups of clamping plates (21) and a baffle (22); the hydraulic cylinder (18) is installed at the bottom end of the workbench (1); the lifting platform (19) is installed at the top end of the hydraulic cylinder (18); the bidirectional hydraulic cylinder (20) is installed at the bottom of the lifting platform (19); the two groups of clamping plates (21) are respectively installed on the two ends of the bidirectional hydraulic cylinder (20); and the baffle (22) is installed at the top end of the lifting platform (19).

2. A laser engraving blanking machine according to claim 1, characterized in that: The limiting mechanism comprises an engraving table (5), two groups of rotating shafts (6), multiple groups of first suction cups (7), multiple groups of second suction cups (8), a driving motor (9), a gear (10), a gear ring (11) and a guide mechanism. A chamber is provided inside the workbench (1), a reserved opening is provided on the top of the workbench (1), the engraving table (5) is rotatably mounted on the top of the workbench (1) through the two groups of rotating shafts (6), and the engraving table (5) is located in the reserved opening of the workbench (1), the multiple groups of first suction cups (7) and the multiple groups of second suction cups (8) are respectively mounted on the top and bottom of the engraving table (5), the driving motor (9) is mounted on the rear end of the workbench (1), the gear (10) is mounted on the output shaft of the driving motor (9), the gear ring (11) is sleeved on the rear rotating shaft (6), and the gear (10) is meshed with the gear ring (11), and the guide mechanism is mounted on the engraving table (5).

3. A laser engraving blanking machine as claimed in claim 2, characterized in that: The guide mechanism comprises a plurality of electric cylinders (12), two brackets (13) and a plurality of guide wheels (14), one end of the plurality of electric cylinders (12) is respectively mounted on the top and bottom ends of the engraving table (5), the two brackets (13) are respectively mounted on the other end of the plurality of electric cylinders (12), and the plurality of guide wheels (14) are respectively mounted on the two brackets (13).

4. A laser engraving blanking machine as claimed in claim 2, characterized in that: The two groups of rotating shafts (6) and the engraving table (5) are both provided with through holes inside.

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