Perforating device for food packaging bag

Abstract

The utility model belongs to the technical field of food packaging bag production, and particularly relates to a punching device for food packaging bags, which comprises a workbench, a first sliding groove is formed in the workbench, a sliding ring is slidably mounted in the first sliding groove, and a plurality of first springs fixed with the bottom of the sliding ring are fixedly mounted in the first sliding groove; the two second sliding grooves are formed in the workbench, sliding blocks are slidably installed in the second sliding grooves, a first air cylinder is fixedly installed in one second sliding groove, and the telescopic end of the first air cylinder is fixedly connected with the top of one sliding block. The sides, close to each other, of the two sliding blocks penetrate through the second sliding grooves, extend to the outside and are fixedly provided with the same connecting column, a rotating disc is rotationally installed on one side of the connecting column, and a plurality of punching heads are fixedly installed on the circumferential side wall of the rotating disc. When the whole device is used, scraps generated by punching can be automatically cleaned and collected, and meanwhile punching heads with different diameters can be conveniently replaced.

Description

Technical Field

[0001] The utility model belongs to the technical field of food packaging bag production, in particular to a punching device for food packaging bags. Background Art

[0002] Packaging bags refer to bags used to package various supplies, which make it convenient to transport and store goods during the production and circulation process. They are widely used in daily life and industrial production.

[0003] For example, the Chinese patent with publication number CN215970342U discloses a punching device for food packaging bags, which includes: a base, a base frame is fixedly installed at the upper end of the base near the side; a processing table, the processing table is fixedly connected to the upper end of the base; a driving component, the driving component is located directly above the processing table and is fixedly connected to the base frame; a punching component, the punching component is fixedly connected to the driving component, corresponding to the position of the processing table. When the pressing plate presses the food packaging bag, the food packaging bag itself will be subjected to a strong pressure. Under the action of pressure, the mobility of the food packaging bag itself will be lower and the stability will be higher. Therefore, during the process of cutting holes, the entire food packaging bag will not be pulled and displaced due to the small processing area, further improving the accuracy of the punching.

[0004] The above patent has the following problems:

[0005] This patent has some disadvantages when used, such as: the device can only punch holes of one specification, and cannot punch holes of different diameters, resulting in a low range of use of the device. At the same time, the device will have debris left after the punching is completed. If the debris is not cleaned up in time, it will fall to the ground, requiring personnel to clean up, wasting time. In view of this, we propose a punching device for food packaging bags. Utility Model Content

[0006] The purpose of the utility model is to provide a punching device for food packaging bags to solve the problems raised in the above background technology.

[0007] In view of this, the utility model provides a punching device for food packaging bags, comprising:

[0008] A workbench, wherein a sliding groove 1 is provided on the workbench, a sliding ring is slidably installed in the sliding groove 1, and a plurality of springs 1 fixed to the bottom of the sliding ring are fixedly installed in the sliding groove 1;

[0009] Two sliding grooves 2, both of which are provided on the workbench, wherein sliding blocks are slidably installed in the sliding grooves 2, wherein a cylinder 1 is fixedly installed in one of the sliding grooves 2, wherein the telescopic end of the cylinder 1 is fixedly connected to the top of one of the sliding blocks, wherein the two sliding blocks are close to each other on one side thereof and extend through the sliding groove 2 to the outside and are fixedly installed with the same connecting column, wherein a rotating disk is rotatably installed on one side of the connecting column, and a plurality of punching heads are fixedly installed on the circumferential side wall of the rotating disk;

[0010] A fixing assembly, which is located on the connecting column and is used to fix the position of the turntable;

[0011] A sliding groove three, wherein the sliding groove three is arranged on the workbench, a sliding rod is slidably installed in the sliding groove three, and an upper end of the sliding rod passes through the sliding groove three and extends to the outside;

[0012] A driving assembly, the driving assembly is located in the workbench and is used to drive the sliding rod to slide back and forth;

[0013] The collecting trough is arranged on the workbench and is located at a side of the sliding ring away from the sliding rod.

[0014] In the technical solution, when it is necessary to punch holes in the packaging bag, first put the packaging bag on the workbench, then place the position where the packaging bag needs to be punched on the top of the sliding ring, and then start the cylinder one. The cylinder one is powered on to drive one of the sliding blocks to slide downward, and one of the sliding blocks drives the connecting column and the other sliding block to slide downward. The connecting column drives the turntable to slide downward, and the turntable drives several punching heads to slide downward. At this time, one of the punching heads will squeeze the packaging bag, and then the packaging bag will be penetrated. Then the sliding ring is squeezed by one of the punching heads and slides downward, and at the same time, several springs are squeezed and contracted. When the punching is completed, the cylinder one drives the sliding block to slide upward, and the sliding block drives the turntable and several punching heads to slide upward through the connecting column. When one of the punching heads is separated from the sliding groove one, under the action of the rebound force of several springs one, the sliding ring slides upward, and at the same time, the debris in the sliding groove one is squeezed out of the sliding groove one. The driving component provided can drive the sliding rod to slide in the direction of the sliding ring, and the sliding rod pushes the debris into the collection groove for collection. The driving component provided can drive the sliding rod to slide in the direction away from the sliding ring and return to its original position;

[0015] When the diameter of the hole needs to be adjusted, the turntable can be rotated through the set fixing component. When the turntable is rotated to the appropriate position, the punching head to be used will be vertically downward. The position of the turntable can be fixed through the set fixing component, so that the position of the punching head is fixed.

[0016] In the above technical solution, further, the fixing assembly includes:

[0017] A limit groove, wherein the limit groove is provided in the connecting column, and a sliding bar is slidably installed in the limit groove, two springs fixed to the inner wall of the limit groove are fixedly installed on one side of the sliding bar, and two sliding columns are fixedly installed on the other side of the sliding bar;

[0018] Four limiting holes are provided on the turntable and close to one side of the connecting column. One end of the two sliding columns passes through the limiting groove and extends into two of the limiting holes respectively. The sliding columns are plugged into the limiting holes.

[0019] In the present technical solution, when it is necessary to adjust the diameter of the hole, first pull the sliding bar in the direction of spring two. At the same time, the two springs two are squeezed and contracted, and the sliding bar drives the two sliding columns to slide and disengage from two of the limiting holes. Then, the turntable is rotated. When the turntable is rotated to the appropriate position, the punching head to be used will move vertically downward. Then, the sliding bar is released. Under the action of the rebound force of the two springs two, the spring two drives the sliding bar to slide in the direction of the turntable. The sliding bar drives the two sliding columns to be inserted into two of the limiting holes respectively, so that the position of the turntable can be fixed, so that the position of the punching head is fixed.

[0020] In the above technical solution, further, the driving component includes:

[0021] Cylinder 2, wherein the cylinder 2 is fixedly installed in the sliding groove 3, and the telescopic end of the cylinder 2 is fixedly connected to the sliding rod.

[0022] In this technical solution, cylinder two is started, and cylinder two is powered on to drive the sliding rod to slide in the direction of the sliding ring. The sliding rod pushes the debris into the collection groove for collection. Finally, cylinder two drives the sliding rod to slide away from the sliding ring and return to its original position.

[0023] In the above technical solution, further, the telescopic end of the cylinder two is slidably connected to the sliding groove three, and the telescopic end of the cylinder one is slidably connected to one of the sliding grooves two.

[0024] In this technical solution, it is ensured that the telescopic end of the cylinder two can slide in the sliding groove three, and it is ensured that the telescopic end of the cylinder one can slide in one of the sliding grooves two.

[0025] In the above technical solution, further, the plurality of punching heads are distributed in a circular shape with equal intervals, and the number of the plurality of punching heads is four.

[0026] In this technical solution, it is convenient to replace the punching head, and the punching head can be vertically placed on the workbench.

[0027] In the above technical solution, further, the connecting column and the two sliding blocks are an integrally formed structure.

[0028] In this technical solution, the stability of the connecting column and the two sliding blocks during operation is ensured.

[0029] The beneficial effects of the utility model are:

[0030] 1. The punching device for food packaging bags, when one of the punching heads is disengaged from the sliding groove, the sliding ring slides upward under the action of the rebound force of a plurality of springs, and at the same time, the debris in the sliding groove is squeezed out of the sliding groove, and the driving component is set to drive the sliding rod to slide in the direction of the sliding ring, and the sliding rod pushes the debris into the collecting groove for collection, and the driving component is set to drive the sliding rod to slide in the direction away from the sliding ring and return to its original position, so that the debris generated by the punching can be automatically cleaned and collected.

[0031] 2. The punching device for food packaging bags can rotate the turntable through the set fixing component when the diameter of the hole needs to be adjusted. When the turntable is rotated to a suitable position, the punching head to be used will be vertically downward. The position of the turntable can be fixed through the set fixing component, so that the position of the punching head is fixed, which is convenient for replacing punching heads of different diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0033] Figure 2 It is a schematic diagram of the cross-sectional structure of the workbench of the utility model;

[0034] Figure 3 It is a schematic diagram of the structure of the second area of ​​the cylinder of the utility model;

[0035] Figure 4 It is a schematic diagram of the cross-sectional structure of the turntable of the utility model;

[0036] Figure 5 It is a schematic diagram of the cross-sectional structure of the connecting column of the utility model.

[0037] The symbols in the figure are:

[0038] 1. Workbench; 2. Sliding groove 1; 3. Sliding ring; 4. Spring 1; 5. Sliding groove 2; 6. Sliding block; 7. Cylinder 1; 8. Connecting column; 9. Turntable; 10. Punching head; 11. Sliding groove 3; 12. Sliding rod; 13. Cylinder 2; 14. Limiting groove; 15. Sliding bar; 16. Spring 2; 17. Sliding column; 18. Limiting hole; 19. Collecting groove. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0040] In the description of the present application, it should be noted that the terms used here are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but in appropriate cases, the techniques, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0041] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0042] It should be noted that, in the description of the present application, the orientation or positional relationship indicated by terms such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these orientation words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application; the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

[0043] It should be noted that, in the present application, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be noted that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0044] Embodiment 1:

[0045] See also Figure 1 - Figure 5 As shown, this embodiment provides a punching device for food packaging bags, comprising:

[0046] A workbench 1 is provided with a sliding groove 2, a sliding ring 3 is slidably installed in the sliding groove 2, and a plurality of springs 4 fixed to the bottom of the sliding ring 3 are fixedly installed in the sliding groove 2;

[0047] Two sliding grooves 2 5, both sliding grooves 2 5 are provided on the workbench 1, sliding blocks 6 are slidably installed in the sliding grooves 2 5, a cylinder 1 7 is fixedly installed in one of the sliding grooves 2 5, the telescopic end of the cylinder 1 7 is fixedly connected to the top of one of the sliding blocks 6, the two sliding blocks 6 are close to each other, both sides pass through the sliding groove 2 5 and extend to the outside and are fixedly installed with the same connecting column 8, a turntable 9 is rotatably installed on one side of the connecting column 8, and a plurality of punching heads 10 are fixedly installed on the circumferential side wall of the turntable 9;

[0048] A fixing component, which is located on the connecting column 8 and is used to fix the position of the rotating disk 9;

[0049] A sliding groove 3 11 is provided on the workbench 1, a sliding rod 12 is slidably installed in the sliding groove 3 11, and the upper end of the sliding rod 12 passes through the sliding groove 3 11 and extends to the outside;

[0050] A driving assembly, which is located inside the workbench 1 and is used to drive the sliding rod 12 to slide back and forth;

[0051] The collecting tank 19 is opened on the workbench 1 and is located at a side of the sliding ring 3 away from the sliding rod 12 .

[0052] When it is necessary to punch holes in a packaging bag, first place the packaging bag on the workbench 1, then place the location where the packaging bag needs to be punched on the top of the sliding ring 3, then start the cylinder 7, the cylinder 7 is powered on and drives one of the sliding blocks 6 to slide downward, one of the sliding blocks 6 drives the connecting column 8 and the other sliding block 6 to slide downward, the connecting column 8 drives the turntable 9 to slide downward, the turntable 9 drives several punching heads 10 to slide downward, at this time one of the punching heads 10 will squeeze the packaging bag, then the packaging bag will be penetrated, then the sliding ring 3 is squeezed by one of the punching heads 10 and slides downward, and at the same time several springs 4 are squeezed The pressure shrinks. When the drilling is completed, the cylinder 7 drives the sliding block 6 to slide upward. The sliding block 6 drives the turntable 9 and the plurality of punching heads 10 to slide upward through the connecting column 8. When one of the punching heads 10 is separated from the sliding groove 2, the sliding ring 3 slides upward under the action of the rebound force of the plurality of springs 4, and at the same time, the debris in the sliding groove 2 is squeezed out of the sliding groove 2. The driving component provided can drive the sliding rod 12 to slide in the direction of the sliding ring 3. The sliding rod 12 pushes the debris into the collecting groove 19 for collection. The driving component provided can drive the sliding rod 12 to slide in the direction away from the sliding ring 3 and return to its original position.

[0053] When the diameter of the hole needs to be adjusted, the turntable 9 can be rotated through the set fixing component. When the turntable 9 is rotated to a suitable position, the punching head 10 to be used will be vertically downward. The position of the turntable 9 can be fixed through the set fixing component, so that the position of the punching head 10 is fixed.

[0054] In this embodiment, the fixing component includes:

[0055] A limit groove 14 is provided in the connecting column 8, and a sliding bar 15 is slidably installed in the limit groove 14, two springs 16 fixed to the inner wall of the limit groove 14 are fixedly installed on one side of the sliding bar 15, and two sliding columns 17 are fixedly installed on the other side of the sliding bar 15;

[0056] Four limiting holes 18, all of which are provided on the rotating disk 9 and close to one side of the connecting column 8, one end of each of the two sliding columns 17 passes through the limiting groove 14 and extends into two of the limiting holes 18 respectively, and the sliding columns 17 are plugged and matched with the limiting holes 18;

[0057] Among them, when it is necessary to adjust the diameter of the punching hole, first pull the sliding bar 15 in the direction of the spring second 16, and at the same time, the two springs 16 are squeezed and contracted, and the sliding bar 15 drives the two sliding columns 17 to slide and disengage from two of the limiting holes 18, and then rotate the turntable 9. When the turntable 9 is rotated to a suitable position, the punching head 10 to be used will move vertically downward, and then release the sliding bar 15. Under the action of the rebound force of the two springs 16, the spring second 16 drives the sliding bar 15 to slide in the direction of the turntable 9, and the sliding bar 15 drives the two sliding columns 17 to be inserted into two of the limiting holes 18 respectively, so that the position of the turntable 9 can be fixed, so that the position of the punching head 10 is fixed.

[0058] In this embodiment, the driving component includes:

[0059] Cylinder 2 13, cylinder 2 13 is fixedly installed in sliding groove 3 11, and the telescopic end of cylinder 2 13 is fixedly connected to the sliding rod 12;

[0060] Among them, cylinder 2 13 is started, and cylinder 2 13 is energized to drive the sliding rod 12 to slide in the direction of the sliding ring 3. The sliding rod 12 pushes the debris into the collecting groove 19 for collection. Finally, cylinder 2 13 drives the sliding rod 12 to slide in the direction away from the sliding ring 3 and return to its original position.

[0061] Embodiment 2:

[0062] This embodiment provides a punching device for food packaging bags, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0063] In this embodiment, the telescopic end of the second cylinder 13 is slidably connected to the sliding groove three 11, and the telescopic end of the first cylinder 7 is slidably connected to one of the sliding grooves two 5.

[0064] Among them, it is ensured that the telescopic end of the cylinder 2 13 can slide in the sliding groove 3 11, and it is ensured that the telescopic end of the cylinder 1 7 can slide in one of the sliding grooves 2 5.

[0065] Embodiment 3:

[0066] This embodiment provides a punching device for food packaging bags, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0067] In this embodiment, the plurality of punching heads 10 are distributed in a ring shape with equal intervals, and the number of the plurality of punching heads 10 is four.

[0068] The punching head 10 can be easily replaced, and the punching head 10 can be placed vertically on the workbench 1 .

[0069] Embodiment 4:

[0070] This embodiment provides a punching device for food packaging bags, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0071] In this embodiment, the connecting column 8 and the two sliding blocks 6 are an integrally formed structure.

[0072] The stability of the connecting column 8 and the two sliding blocks 6 during operation is ensured.

[0073] Working principle: When it is necessary to punch holes in a packaging bag, first place the packaging bag on the workbench 1, then place the location where the packaging bag needs to be punched on the top of the sliding ring 3, and then start the cylinder 7. The cylinder 7 is powered on to drive one of the sliding blocks 6 to slide downward, and one of the sliding blocks 6 drives the connecting column 8 and the other sliding block 6 to slide downward. The connecting column 8 drives the turntable 9 to slide downward, and the turntable 9 drives several punching heads 10 to slide downward. At this time, one of the punching heads 10 will squeeze the packaging bag, and then the packaging bag will be penetrated. Then the sliding ring 3 is squeezed by one of the punching heads 10 and slides downward, and at the same time, several springs 4 are squeezed. The pressure shrinks. When the drilling is completed, the cylinder 1 7 drives the sliding block 6 to slide upward. The sliding block 6 drives the turntable 9 and a plurality of punching heads 10 to slide upward through the connecting column 8. When one of the punching heads 10 is separated from the sliding groove 2, the sliding ring 3 slides upward under the action of the rebound force of a plurality of springs 4, and at the same time, the debris in the sliding groove 2 is squeezed out of the sliding groove 2. Then the cylinder 2 13 is started. The cylinder 2 13 is powered on to drive the sliding rod 12 to slide in the direction of the sliding ring 3. The sliding rod 12 pushes the debris into the collecting groove 19 for collection. Finally, the cylinder 2 13 drives the sliding rod 12 to slide away from the sliding ring 3 and return to its original position.

[0074] When the diameter of the hole needs to be adjusted, the sliding bar 15 is first pulled in the direction of the spring 2 16. At the same time, the two springs 16 are squeezed and contracted, and the sliding bar 15 drives the two sliding columns 17 to slide and disengage from two of the limiting holes 18. Then the turntable 9 is rotated. When the turntable 9 is rotated to a suitable position, the punching head 10 to be used will move vertically downward. Then the sliding bar 15 is released. Under the action of the rebound force of the two springs 16, the spring 2 16 drives the sliding bar 15 to slide in the direction of the turntable 9. The sliding bar 15 drives the two sliding columns 17 to be inserted into two of the limiting holes 18 respectively, so that the position of the turntable 9 can be fixed, so that the position of the punching head 10 is fixed.

[0075] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A punching device for food packaging bags, characterized in that: include: A workbench (1), wherein a sliding groove (2) is provided on the workbench (1), a sliding ring (3) is slidably installed in the sliding groove (2), and a plurality of springs (4) fixed to the bottom of the sliding ring (3) are fixedly installed in the sliding groove (2); Two sliding grooves (5), both of which are provided on the workbench (1), wherein a sliding block (6) is slidably installed in each of the sliding grooves (5), wherein a cylinder (7) is fixedly installed in one of the sliding grooves (5), wherein the telescopic end of the cylinder (7) is fixedly connected to the top of one of the sliding blocks (6), wherein the two sliding blocks (6) are close to each other and extend through the sliding groove (5) to the outside and are fixedly installed with a same connecting column (8), wherein a rotating disk (9) is rotatably installed on one side of the connecting column (8), and a plurality of punching heads (10) are fixedly installed on the circumferential side wall of the rotating disk (9); A fixing assembly, the fixing assembly being located on the connecting column (8) and being used to fix the position of the rotating disk (9); A sliding groove (11), wherein the sliding groove (11) is provided on the workbench (1), a sliding rod (12) is slidably installed in the sliding groove (11), and the upper end of the sliding rod (12) passes through the sliding groove (11) and extends to the outside; A driving assembly, the driving assembly is located in the workbench (1) and is used to drive the sliding rod (12) to slide back and forth; A collecting trough (19) is provided on the workbench (1) and is located on a side of the sliding ring (3) away from the sliding rod (12).

2. A punching device for food packaging bags according to claim 1, characterized in that: The fixing assembly comprises: A limiting groove (14), wherein the limiting groove (14) is provided in the connecting column (8), and a sliding bar (15) is slidably installed in the limiting groove (14), and two springs (16) fixed to the inner wall of the limiting groove (14) are fixedly installed on one side of the sliding bar (15), and two sliding columns (17) are fixedly installed on the other side of the sliding bar (15); Four limiting holes (18), the four limiting holes (18) are all opened on the rotating disk (9) and close to one side of the connecting column (8), one end of the two sliding columns (17) passes through the limiting groove (14) and extends into two of the limiting holes (18) respectively, and the sliding columns (17) are plugged into and matched with the limiting holes (18).

3. A punching device for food packaging bag according to claim 2, characterized in that: The drive assembly comprises: Cylinder 2 (13), wherein the cylinder 2 (13) is fixedly installed in the sliding groove 3 (11), and the telescopic end of the cylinder 2 (13) is fixedly connected to the sliding rod (12).

4. A punching device for food packaging bag according to claim 3, characterized in that: The telescopic end of the second cylinder (13) is slidably connected to the third sliding groove (11), and the telescopic end of the first cylinder (7) is slidably connected to one of the second sliding grooves (5).

5. A punching device for food packaging bag according to claim 1, characterized in that: The plurality of punching heads (10) are distributed in a circular shape with equal spacing, and the number of the plurality of punching heads (10) is four.

6. A punching device for food packaging bag according to claim 1, characterized in that: The connecting column (8) and the two sliding blocks (6) are an integrally formed structure.

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