Material receiving equipment based on laser cutting

Abstract

The utility model provides material receiving equipment based on laser cutting, which comprises two parallel supporting inclined rails, and the tops of the supporting inclined rails are inclined; the bearing vehicle is in a cover shape with an upward opening, two supporting wheels are arranged at the X end of the bottom of the bearing vehicle, and two supporting frames are arranged at the-X end of the bottom of the bearing vehicle. The first wheel body and the second wheel body are rotationally connected to the two supporting frames respectively, one supporting inclined rail supports one supporting wheel and the first wheel body, the other supporting inclined rail supports the other supporting wheel and the second wheel body, and the bottoms of the first wheel body and the second wheel body are lower than the bottoms of the supporting wheels; the positioning mechanism is used for fixing the position of the first wheel body; the resistance table is in a horizontal circular truncated cone shape; the adjusting mechanism is used for adjusting the position of the resistance table and enabling the resistance table to be separated from the second wheel body or movably attached to the outer side of the second wheel body, and the length direction of the resistance table is perpendicular to the plane where the second wheel body is located; and the operating handle is connected to the-X end of the carrying vehicle. According to the material receiving equipment based on laser cutting, the operation difficulty can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to laser cutting technical field relates to the receiving equipment based on laser cutting. BACKGROUND

[0002] The laser cutting machine is the laser that emits from laser, focuses into high power density laser beam through optical path system. Laser beam irradiates to workpiece surface, makes workpiece reach melting point or boiling point, high pressure gas with beam coaxially blows away melted or vaporized metal. With the relative position of light beam and workpiece movement, finally makes material form cut seam, thereby achieves the purpose of cutting.

[0003] Laser cutting processing is with invisible light beam instead of traditional mechanical knife, has high precision, cutting is fast, is not limited to cutting pattern restriction, automatic layout saves material, cutout is smooth, processing cost is low etc., will gradually improve or replace traditional metal cutting process equipment. The mechanical part of laser cutter head has no contact with workpiece, and will not scratch the surface of the workpiece during work. Laser cutting speed is fast, and the cut is smooth and flat. Generally, no subsequent processing is required. The heat affected zone is small, the deformation of the plate is small, and the cut seam is narrow (0.1mm-0.3mm). The cut has no mechanical stress and no shear burr. The processing precision is high, the repeatability is good, and the material surface is not damaged. Numerical control programming can process any plane figure and can cut large plates without mold. It is economical and time-saving.

[0004] At present, the laser cutting machine on the market mainly includes a part supporting the steel plate and a laser head part for cutting the steel plate. When cutting, the steel plate is placed on the part, the laser head generates laser and supports the steel plate, and the cut parts or waste fall down through the supporting part, which is received by the receiving trolley. Then the trolley is regularly dragged outside for cleaning. A receiving device for laser cutting machine with announcement number CN219005000U is disclosed on the current market, which has good effect of receiving falling material. However, it is found in actual use that after the material is loaded into the trolley, a downward force is generated, so that the worker needs to exert a force to push the trolley upward and move the trolley backward while moving the trolley outward, which is difficult to operate. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a receiving equipment based on laser cutting, which aims to solve the problem of high operation difficulty.

[0006] To solve the above technical problems, the utility model provides a receiving equipment based on laser cutting, which comprises:

[0007] Two parallel support inclined rails, the top of the support inclined rail is inclined;

[0008] The receiving vehicle is in the form of a cover with an opening upward, two support wheels are arranged at the X end of the bottom of the receiving vehicle, and two support frames are arranged at the X end;

[0009] The first wheel body and the second wheel body are respectively rotationally connected to the two support frames, one support inclined rail supports the support wheel and the first wheel body, and the other support inclined rail supports the other support wheel and the second wheel body, and the bottom of the first wheel body and the second wheel body is lower than the bottom of the support wheel;

[0010] The positioning mechanism is used for fixing the position of the first wheel body;

[0011] The resistance table is in the form of a horizontal circular table;

[0012] The adjusting mechanism is used for adjusting the position of the resistance table, and the resistance table is separated from the second wheel body or is movably attached to the outer side of the second wheel body, and the length direction of the resistance table is perpendicular to the plane where the second wheel body is located;

[0013] The operation handle is connected to the X end of the receiving vehicle.

[0014] The utility model further sets up that the X end outside of receiving vehicle is provided with two L character shape's support arm, two support arms between horizontal setting has the sliding column, the longitudinal section of sliding column is rectangle;

[0015] The adjusting mechanism comprises a sliding cylinder which is slidingly connected to the outer wall of the sliding column, the outer wall of the sliding column is movably attached to the inner wall of the sliding cylinder, the inner side of the sliding cylinder is provided with a connecting rod, the side of the connecting rod is provided with a connecting arm, and the free end of the connecting arm is connected with one end of the resistance table.

[0016] The utility model further sets up that the resistance table one end of diameter is relatively big and is connected with the connecting arm, and the resistance table and the receiving vehicle are in the form of separation.

[0017] The utility model further sets up that the end of operation handle is connected with the outside of sliding cylinder.

[0018] The utility model further sets up that the end of connecting rod is horizontally provided with the cylindrical stabilizing column, the outer wall of receiving vehicle is horizontally provided with the stabilizing table, the outside of stabilizing table is horizontally provided with the stabilizing groove for the activity of stabilizing column and the free end of connecting rod, the outer wall of stabilizing column is movably attached to the inner wall of stabilizing groove, and the radian of the longitudinal section of stabilizing groove is greater than pi.

[0019] The utility model further sets up, first wheel body is near the side of second wheel body is equipped with a plurality of annular distribution's positioning slot, the positioning mechanism includes positioning arm, one end of positioning arm is connected with the connecting rod, and the other end can insert any positioning slot;

[0020] When the sliding cylinder is located in the middle part of the sliding column, the positioning arm and the positioning slot are in a separated state, and the resistance platform and the second wheel body are in a separated state;

[0021] When the free end of the positioning arm is inserted into the positioning slot, the resistance platform and the second wheel body are in a separated state;

[0022] When the resistance platform and the second wheel body are in an active state, the positioning arm and the positioning slot are in a separated state.

[0023] The utility model further sets up, the inside of positioning slot is equipped with anti -drop slot, the free end of positioning arm is provided with the anti -drop part of anti -drop slot.

[0024] The utility model further sets up, the both sides top of support inclined rail all are provided with limiting portion, support wheel, first wheel body and second wheel body all are located between two adjacent limiting portion.

[0025] The utility model further sets up, the bottom of limiting portion is provided with arc -shaped guide portion, and two adjacent guide portion is in the shape of eight.

[0026] The utility model further sets up, and the top between two adjacent limiting portion is provided with the termination for limiting support wheel.

[0027] Compared with the prior art, the receiving equipment based on laser cutting provided by the utility model is characterized in that when the receiving vehicle is pushed to below the workbench of the laser cutting machine, the receiving vehicle is empty and thus lighter in weight, and the receiving vehicle can be pushed to the inclined supporting inclined rail more easily through the operation handle; when the receiving vehicle needs to be cleaned or the product needs to be taken out, the position of the first wheel body is fixed through the positioning mechanism after the positioning mechanism is released, and the position of the resistance table is adjusted through the adjusting mechanism, and the resistance table is attached to the side wall of the second wheel body, so that the second wheel body is subjected to a certain resistance from the resistance table when the second wheel body is moved downward, the receiving vehicle can be lowered more slowly, the pushing force applied to the operation handle by the worker is reduced, the operation is more convenient and simple, and the receiving vehicle can be prevented from being subjected to a large downward force when the receiving vehicle is too heavy, so that the receiving vehicle can be slowly lowered and the operation safety is higher.

[0028] Preferably, the second wheel body has a resilient layer on the outer wall, so that the resistance table and the second wheel body can be conveniently acted on and the acting force between the resistance table and the second wheel body can be adjusted; or the second wheel body and the resistance table are both hard, but the resistance table and / or the second wheel body are plastic parts with certain elasticity, so that although the resistance table and / or the second wheel body are hard, the resistance table and / or the second wheel body actually have certain deformability, and the resistance applied to the second wheel body by the resistance table can be adjusted by moving the relative positions of the resistance table and the second wheel body, so that the resistance is suitable for the mass of the current receiving table and the material. The diameters of the two ends of the resistance table in the application are very small or small, so that the resistance table can apply resistance to the second wheel body and can be adjusted at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a structure diagram of an embodiment of the receiving equipment based on laser cutting of the utility model Figure 1 ,

[0030] Figure 2 is Figure 1 an enlarged view of part A in the figure

[0031] Figure 3 is Figure 1 an enlarged view of part B in the figure

[0032] Figure 4 isFigure 1 Enlarged view of part C;

[0033] Figure 5 is Figure 1 Enlarged view of part D;

[0034] Figure 6 is a structural schematic of an embodiment of the material receiving equipment based on laser cutting of the utility model Figure 2 ;

[0035] Figure 7 is Figure 6 Enlarged view of part E;

[0036] Figure 8 is a structural schematic of an embodiment of the material receiving equipment based on laser cutting of the utility model Figure 1 ,

[0037] Figure 9 is Figure 8 Enlarged view of part F;

[0038] Figure 10 is a schematic view of an embodiment of the sliding cylinder part in the material receiving equipment based on laser cutting of the utility model

[0039] Figure 11 is a schematic view of an embodiment of the first wheel body in the material receiving equipment based on laser cutting of the utility model.

[0040] Wherein, 1, support inclined rail; 2, receiving vehicle; 3, support wheel; 4, support frame; 5, first wheel body; 6, second wheel body; 7, resistance platform; 8, operating handle; 9, support arm; 10, sliding column; 11, sliding cylinder; 12, connecting rod; 13, connecting arm; 14, stabilizing column; 15, stabilizing platform; 16, stabilizing groove; 17, positioning groove; 18, positioning arm; 19, anti-drop groove; 20, anti-drop part; 21, limiting part; 22, guide part; 23, termination part. DETAILED DESCRIPTION

[0041] The material receiving equipment based on laser cutting of the utility model is further described in detail below in combination with the drawings and specific embodiments. The advantages and features of the utility model will be more apparent according to the following description. It should be noted that the drawings are all very simplified and use non-precise proportions, only for the purpose of facilitating and clearly assisting the description of the embodiments of the utility model. The same or similar reference signs in the drawings represent the same or similar parts.

[0042] A material receiving equipment based on laser cutting, as shown in Figures 1 to 11 , comprising:

[0043] Two support inclined rails 1 in parallel, the top of the support inclined rail 1 is inclined;

[0044] A receiving vehicle 2, which is in the shape of a cover with an opening upward, the X end of the bottom of the receiving vehicle 2 is provided with two supporting wheels 3, and the X end is provided with two supporting frames 4;

[0045] A first wheel body 5 and a second wheel body 6, which are respectively rotationally connected to the two supporting frames 4, one supporting inclined rail 1 supports one supporting wheel 3 and the first wheel body 5, and the other supporting inclined rail 1 supports the other supporting wheel 3 and the second wheel body 6, the bottom of the first wheel body 5 and the second wheel body 6 is lower than the bottom of the supporting wheel 3;

[0046] A positioning mechanism for fixing the position of the first wheel body 5;

[0047] A resistance platform 7, which is in the shape of a horizontal circular platform;

[0048] An adjusting mechanism for adjusting the position of the resistance platform 7, and making the resistance platform 7 separate from or movably fit on the outside of the second wheel body 6, the length direction of the resistance platform 7 is perpendicular to the plane where the second wheel body 6 is located;

[0049] An operation handle 8 connected to the X end of the receiving vehicle 2.

[0050] The X end of the receiving vehicle 2 is provided with two L-shaped supporting arms 9, and a sliding column 10 is horizontally arranged between the two supporting arms 9, the longitudinal section of the sliding column 10 is in the shape of a rectangle;

[0051] The adjusting mechanism includes a sliding cylinder 11 slidingly connected to the outer wall of the sliding column 10, the outer wall of the sliding column 10 movably fits on the inner wall of the sliding cylinder 11, the inner side of the sliding cylinder 11 is provided with a connecting rod 12, the side of the connecting rod 12 is provided with a connecting arm 13, and the free end of the connecting arm 13 is connected to one end of the resistance platform 7.

[0052] The end with larger diameter of the resistance platform 7 is connected to the connecting arm 13, and the resistance platform 7 is in a separated state with the receiving vehicle 2.

[0053] The end of the operation handle 8 is connected to the outside of the sliding cylinder 11.

[0054] The end of the connecting rod 12 is horizontally provided with a cylindrical stabilizing column 14, the outer wall of the receiving vehicle 2 is horizontally provided with a stabilizing platform 15, the outer side of the stabilizing platform 15 is horizontally provided with a stabilizing groove 16 for the free movement of the stabilizing column 14 and the free end of the connecting rod 12, the outer wall of the stabilizing column 14 is movably attached to the inner wall of the stabilizing groove 16, and the curvature of the longitudinal section of the stabilizing groove 16 is greater than π.

[0055] The first wheel body 5 is provided with a plurality of positioning grooves 17 arranged in a ring shape on one side close to the second wheel body 6, the positioning mechanism comprises a positioning arm 18, one end of the positioning arm 18 is connected to the connecting rod 12, and the other end can be inserted into any of the positioning grooves 17.

[0056] When the sliding cylinder 11 is located at the middle part of the sliding column 10, the positioning arm 18 is in a separated state with the positioning groove 17, and the resistance platform 7 is in a separated state with the second wheel body 6.

[0057] When the free end of the positioning arm 18 is inserted into the positioning groove 17, the resistance platform 7 is in a separated state with the second wheel body 6.

[0058] When the resistance platform 7 is in a movably attached state with the second wheel body 6, the positioning arm 18 is in a separated state with the positioning groove 17.

[0059] The inner side of the positioning groove 17 is provided with an anti-falling groove 19, and the free end of the positioning arm 18 is provided with an anti-falling part 20 which can be inserted into the anti-falling groove 19.

[0060] The two sides of the supporting inclined rail 1 are provided with limiting parts 21 at the top, the supporting wheel 3, the first wheel body 5 and the second wheel body 6 are located between two adjacent limiting parts 21. The bottom of the limiting part 21 is provided with a circular arc-shaped guide part 22, and two adjacent guide parts 22 are in a spread shape. The top of two adjacent limiting parts 21 is provided with a termination part 23 for limiting the supporting wheel 3.

[0061] The material receiving equipment based on laser cutting is provided in the utility model, when the receiving vehicle 2 is pushed to the workbench below the laser cutting machine, the receiving vehicle 2 is empty at the moment, therefore the mass is lighter, and the receiving vehicle 2 can be pushed to the inclined supporting inclined rail 1 more easily through the operation handle 8; when the receiving vehicle 2 reaches the appropriate position, the position of the first wheel body 5 is fixed through the positioning mechanism, and the receiving vehicle 2 is prevented from sliding off the supporting inclined rail 1. When it is needed to clean the receiving vehicle 2 or take out the product, the positioning mechanism is only needed to be unfastened, the position of the resistance table 7 is adjusted through the adjusting mechanism, and the resistance table 7 is attached to the side wall of the second wheel body 6; since the position of the resistance table 7 is fixed, when the second wheel body 6 is moved downward, the resistance table 7 can apply certain resistance to the second wheel body 6, and the receiving vehicle 2 can be lowered more slowly, and the pushing force applied to the operation handle 8 by the worker is also reduced, so that the operation convenience is higher, the operation is simpler, and the receiving vehicle 2 can be prevented from having great downward force after being too heavy, so that the receiving vehicle 2 can be lowered slowly, and the operation safety is higher. In addition, since the resistance table 7 is a circular table, the distance between the part with the greater diameter and the side wall of the second wheel body 6 is smaller, so that the resistance applied to the second wheel body 6 by the resistance table 7 is greater, so that the receiving vehicle 2 with different bearing capacities can be applied.

[0062] The second wheel body 6 is preferably provided with a circle of elastic layers on the outer wall, so that the resistance table 7 can be conveniently acted on the second wheel body 6, and the acting force between the resistance table 7 and the second wheel body 6 can be adjusted; or the second wheel body 6 and the resistance table 7 are both hard, but the resistance table 7 and / or the second wheel body 6 are plastic parts with certain elasticity, so that although the resistance table 7 and / or the second wheel body 6 are hard, the resistance table 7 and / or the second wheel body 6 still have certain plasticity, and the resistance applied to the second wheel body 6 by the resistance table 7 can be adjusted by moving the relative positions of the resistance table 7 and the second wheel body 6, so that the resistance table 7 and / or the second wheel body 6 are deformed to different degrees, and the resistance applied to the second wheel body 6 by the resistance table 7 can be adjusted, and the resistance is suitable for the mass of the current receiving table and the material. The diameters of the resistance table 7 at both ends are very small or small in the utility model, so that the resistance table 7 can apply resistance to the second wheel body 6 and be adjusted.

[0063] In actual use, first push the receiving vehicle 2 upward by operating the handle 8, and after the receiving vehicle 2 reaches the appropriate position, swing the handle 8 horizontally to one side of the first wheel body 5, drive the sliding cylinder 11, connecting rod 12 and positioning arm 18 to move towards the first wheel body 5, and make the positioning arm 18 inserted into one of the stable grooves 16; if the positioning arm 18 does not insert into the positioning groove 17 at a certain position, the receiving vehicle 2 needs to be moved slightly upward or downward, so that the positioning arm 18 can be inserted into the corresponding positioning groove 17; then release the handle 8, at this time the receiving vehicle 2 slightly moves downward under the action of gravity, and the anti-dropping part 20 is clamped into the anti-dropping groove 19, so that the position of the receiving vehicle 2 can be stably stopped on the support inclined rail 1.

[0064] When moving out the receiving vehicle 2, only need to slightly push the handle 8 upward, and make the anti-dropping part 20 out of the anti-dropping groove 19 (the anti-dropping groove 19 is very shallow, in actual operation, the worker only needs to exert a larger instantaneous pushing force to make the anti-dropping part 20 out of the anti-dropping groove 19), then move the handle 8 towards the second wheel body 6, and make the connecting arm 13 and the resistance platform 7 quickly move towards the second wheel body 6; in the movement process, the waist line side wall of the resistance platform 7 touches the side wall of the second wheel body 6, and the longer the length of the resistance platform 7 passing through the second wheel body 6, the greater the resistance of the second wheel body 6, so that the worker can move the position of the handle 8 according to the actual situation of the receiving vehicle 2; at the same time, the worker can also move the handle 8 in real time after moving a certain distance, so that the downward force of the receiving vehicle 2 can be very small or even disappear. Because the second wheel body 6 is resisted by the resistance platform 7 during rotation, the receiving vehicle 2 can be stably moved to the bottom of the support inclined rail 1 and moved out to the outside of the workpiece platform.

[0065] The handle 8 can not only push and pull the receiving vehicle 2, but also move the position of the sliding cylinder 11, adjust the positions of the positioning arm 18 and the resistance platform 7, and achieve the effects of locking the receiving vehicle 2 and adjusting the resistance of the receiving vehicle 2. The sliding cylinder 11 and the sliding column 10 are in sliding fit, and the stable column 14 at the end of the connecting rod 12 is limited by the stable groove 16, so that the positioning arm 18 and the connecting arm 13 can be more stably supported during use, and can also protect the sliding cylinder 11, the supporting arm 9 and the like.

[0066] Moreover, the support wheel 3, the first wheel body 5 and the second wheel body 6 are limited by the limiting portions 21 during lifting, so that the stability of the lifting of the receiving vehicle 2 can be maintained; meanwhile, the guiding portion 22 at the bottom can guide the support wheel 3, the first wheel body 5 and the second wheel body 6, so that the support wheel 3, the first wheel body 5 and the second wheel body 6 can be smoothly positioned between the two limiting portions 21; meanwhile, the termination portion 23 can prevent the receiving vehicle 2 from sliding off the support inclined rail 1, so that the use stability is ensured. When the support wheel 3 abuts against the termination portion 23, the anti-disengagement portion 20 can be inserted into one of the positioning grooves 17, so that the operation convenience is improved.

[0067] In still another embodiment, the end of the positioning arm 18 is not provided with the anti-disengagement portion 20, that is, the positioning arm 18 is kept in stable relative position with the first wheel body 5 by the static friction force with the inner wall of the positioning groove 17.

[0068] The above description is only a description of the preferred embodiments of the present application, and does not limit the scope of the present application in any way. Any modification or change made by a person skilled in the art according to the above disclosure is within the protection scope of the claims.

Claims

1. A receiving device based on laser cutting, characterized in that, include: Two parallel support rails (1), the top of which is inclined; The receiving vehicle (2) is a cover-shaped structure with an opening facing upwards. The bottom of the receiving vehicle (2) is provided with two support wheels (3) at the X end and two support frames (4) at the -X end. The first wheel (5) and the second wheel (6) are rotatably connected to the two support frames (4), one support rail (1) supports one support wheel (3) and the first wheel (5), and the other support rail (1) supports another support wheel (3) and the second wheel (6). The bottom of the first wheel (5) and the second wheel (6) is lower than the bottom of the support wheel (3). A positioning mechanism is provided for fixing the position of the first wheel (5). Resistance platform (7), the resistance platform (7) is a horizontal frustum shape; An adjustment mechanism is used to adjust the position of the resistance platform (7) and make the resistance platform (7) separate from the second wheel body (6) or move to fit against the outside of the second wheel body (6). The length direction of the resistance platform (7) is perpendicular to the plane where the second wheel body (6) is located. Operating handle (8), which is connected to the -X end of the receiving vehicle (2).

2. The receiving equipment based on laser cutting according to claim 1, characterized in that, Two L-shaped support arms (9) are provided on the outer side of the -X end of the receiving vehicle (2), and a sliding column (10) is horizontally arranged between the two support arms (9). The longitudinal section of the sliding column (10) is rectangular. The adjustment mechanism includes a sliding cylinder (11) slidably connected to the outer wall of the sliding column (10). The outer wall of the sliding column (10) is movably attached to the inner wall of the sliding cylinder (11). A connecting rod (12) is provided on the inner side of the sliding cylinder (11). A connecting arm (13) is provided on the side of the connecting rod (12). The free end of the connecting arm (13) is connected to one end of the resistance platform (7).

3. The receiving equipment based on laser cutting according to claim 2, characterized in that, The diameter of one end of the resistance platform (7) connected to the connecting arm (13) is larger than the diameter of the other end, and the resistance platform (7) and the receiving vehicle (2) are separate.

4. The receiving equipment based on laser cutting according to claim 3, characterized in that, The end of the operating handle (8) is connected to the outside of the sliding cylinder (11).

5. The receiving device based on laser cutting according to claim 2, characterized in that, A cylindrical stabilizing column (14) is horizontally provided at the end of the connecting rod (12), and a stabilizing platform (15) is horizontally provided on the outer wall of the receiving vehicle (2). A stabilizing groove (16) is horizontally provided on the outer side of the stabilizing platform (15) for the free end of the stabilizing column (14) and the connecting rod (12) to move. The outer wall of the stabilizing column (14) is movably attached to the inner wall of the stabilizing groove (16), and the arc of the longitudinal section of the stabilizing groove (16) is greater than π.

6. The receiving device based on laser cutting according to claim 3, characterized in that, The first wheel body (5) has several positioning grooves (17) arranged in a ring on the side near the second wheel body (6). The positioning mechanism includes a positioning arm (18), one end of which is connected to the connecting rod (12), and the other end can be inserted into any of the positioning grooves (17). When the sliding cylinder (11) is located in the middle of the sliding column (10), the positioning arm (18) is separated from the positioning groove (17), and the resistance platform (7) is separated from the second wheel body (6). When the free end of the positioning arm (18) is inserted into the positioning groove (17), the resistance platform (7) and the second wheel body (6) are separated. When the resistance platform (7) and the second wheel (6) are in a movable contact state, the positioning arm (18) and the positioning groove (17) are in a separated state.

7. The receiving device based on laser cutting according to claim 6, characterized in that, The positioning groove (17) has an anti-detachment groove (19) on its inner side, and the free end of the positioning arm (18) is provided with an anti-detachment part (20) that can be inserted into the anti-detachment groove (19).

8. The receiving device based on laser cutting according to claim 1, characterized in that, Limiting parts (21) are provided on the top of both sides of the support rail (1), and the support wheel (3), the first wheel body (5) and the second wheel body (6) are all located between two adjacent limiting parts (21).

9. The receiving device based on laser cutting according to claim 8, characterized in that, The bottom of the limiting part (21) is provided with an arc-shaped guide part (22), and two adjacent guide parts (22) are in a figure-eight shape.

10. The receiving device based on laser cutting according to claim 8, characterized in that, A termination part (23) for limiting the support wheel (3) is provided between the tops of two adjacent limiting parts (21).

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