Folding type storage basket back plate mold with multi-point pouring hot runner structure

Abstract

The utility model provides a folding type storage basket back plate mold with a multi-point pouring hot runner structure, and belongs to the technical field of molds. The back plate forming mold comprises an upper mold plate and a lower mold plate, a back plate forming cavity is formed between the upper mold plate and the lower mold plate, and a hot runner multi-point pouring mechanism is arranged on the upper side of the upper mold plate. The injection molding efficiency can be improved through multi-point glue feeding into the back plate forming cavity through the hot runner multi-point pouring mechanism, the first through groove body forming structure and the second through groove body forming structure can form a through groove body in a back plate main body, and the supporting plate forming structure can form a supporting plate at the bottom of the back plate during back plate injection molding. And the outer edge forming structure can form outer edges protruding towards the front face and the back face of the back plate on the back plate, and the outer edges can improve the overall strength of the back plate.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds and relates to a foldable storage basket backboard mold with a multi-point pouring hot runner structure. Background Art

[0002] The back panel of a foldable storage basket is generally formed by injection molding. Since the back panel is thin and has a large area, when the single-point pouring mechanism in the prior art is used for injection molding, the speed at which the injection liquid fills the molding cavity is slow, and the injection liquid is prone to lose temperature while flowing in the mold, resulting in premature solidification, which will cause the flow rate of the injection liquid to be further reduced. In addition, the different condensation times of the injection liquid at different positions in the molding cavity will also reduce the quality of the back panel product.

[0003] For example, a Chinese patent discloses a hollow plastic storage basket injection molding mold [application number: 202221194547.6], including a lower mold plate, a bottom mold groove is opened in the middle of the lower mold plate, an injection hole is arranged in the bottom mold groove, a fixed connecting groove is also arranged on the lower mold plate, a storage basket bottom molding plate is arranged on the side of the lower mold plate, and a plastic storage basket core piece is arranged on the side of the storage basket bottom molding plate. Utility Model Content

[0004] The utility model aims to solve the above problems and provides a foldable storage basket back plate mold with a multi-point pouring hot runner structure.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A foldable storage basket backboard mold with a multi-point pouring hot runner structure comprises an upper template and a lower template, a backboard molding cavity is arranged between the upper template and the lower template, a hot runner multi-point pouring mechanism is arranged on the upper side of the upper template, a No. 1 through-trough molding structure and a No. 2 through-trough molding structure which can mold a through-trough on the left and right sides of the backboard product are also arranged between the upper template and the lower template, a support plate molding structure which can mold a support plate at the bottom of the backboard product is also arranged between the upper template and the lower template, and an outer edge molding structure connected to the support plate molding structure is also arranged at the edge of the backboard molding cavity.

[0007] In the above-mentioned foldable storage basket back panel mold with a multi-point pouring hot runner structure, the hot runner multi-point pouring mechanism includes an injection liquid diverter plate with a Wang-shaped cross-section, six injection molding tubes are fixedly connected to the bottom of the injection molding liquid diverter plate, and the six injection molding tubes are respectively fixed on the six support arms of the injection molding liquid diverter plate, and the bottom of the injection molding tube is connected to the back panel molding cavity.

[0008] In the above-mentioned foldable storage basket back panel mold with a multi-point hot runner structure, the No. 1 through-groove forming structure includes a No. 1 groove forming block protruding from the bottom of the upper mold and a No. 1 groove forming groove recessed inwardly on the lower mold. The cross-sections of the No. 1 groove forming block and the No. 1 groove forming groove are rectangular. The No. 1 groove forming groove is provided with a plurality of grooves with arc-shaped cross-sections on the side away from the No. 2 through-groove forming structure, and the No. 1 groove forming block is provided with a plurality of arc-shaped protrusions corresponding to the grooves.

[0009] In the above-mentioned foldable storage basket back panel mold with a multi-point hot runner structure, the No. 2 through-trough body forming structure includes a plurality of lower trough body forming blocks protrudingly arranged on the lower template and a plurality of upper trough body forming blocks protrudingly arranged on the upper template, and the plurality of lower trough body forming blocks and the plurality of upper trough body forming blocks are distributed in a rectangular array.

[0010] In the above-mentioned foldable storage basket back panel mold with a multi-point hot runner structure, the support plate molding structure includes a support plate back panel molding groove that is recessed inwardly on the lower mold plate and a support plate body molding groove that is recessed inwardly on the upper mold plate. The upper mold plate is also provided with an upper insert connected to the support plate body molding groove.

[0011] In the above-mentioned foldable storage basket back panel mold with a multi-point hot runner structure, the outer edge molding structure includes an outer edge molding groove correspondingly arranged on the upper mold plate and the lower mold plate and circumferentially arranged along the outer edge of the back panel molding cavity, and the two ends of the outer edge molding groove are respectively connected to the two ends of the support plate molding structure.

[0012] In the above-mentioned foldable storage basket back panel mold with a multi-point hot runner structure, a snap-on molding structure capable of forming two relatively arranged hooks on the front side of the back panel product is provided between the upper template and the lower template, and a buckle plate molding structure capable of forming a U-shaped buckle plate on the back side of the back panel product is provided between the upper template and the lower template.

[0013] In the above-mentioned foldable storage basket back panel mold with a multi-point hot runner structure, the snap-on molding structure includes two inwardly recessed snap-on molding grooves arranged on the upper mold plate, the snap-on molding groove is arranged on the side of the No. 1 through-groove molding structure away from the No. 2 through-groove molding structure, and a snap-on molding block is protrudingly arranged on the lower mold plate, and the snap-on molding block is inserted into the snap-on molding groove, and two symmetrically arranged hook molding grooves are formed between the two sides of the snap-on molding block and the inner wall of the snap-on molding groove, and arc chamfers are arranged on both sides of the top of the snap-on molding block.

[0014] In the above-mentioned foldable storage basket backboard mold with a multi-point pouring hot runner structure, two lower inserts are fixed to the lower mold plate by bolts, and the buckle molding block is located at the top of the lower insert.

[0015] In the above-mentioned foldable storage basket back panel mold with a multi-point pouring hot runner structure, the gusset plate forming structure includes a plurality of groups of gusset plate forming grooves symmetrically arranged on both sides of the lower template and recessed inwardly, and a plurality of gusset plate forming blocks protruding from the upper template that can be inserted into the gusset plate forming grooves, the two ends of the gusset plate forming blocks abut against the inner walls of the two sides of the gusset plate forming grooves, and a U-shaped gusset plate forming groove is formed between the gusset plate forming blocks and the gusset plate forming grooves.

[0016] Compared with the existing technology, the advantages of the utility model are:

[0017] 1. The injection molding efficiency can be improved by injecting glue into the back plate molding cavity at multiple points through the hot runner multi-point pouring mechanism. The No. 1 through-trough molding structure and the No. 2 through-trough molding structure can form a through-trough on the back plate body. The support plate molding structure can form a support plate at the bottom of the back plate during the back plate injection molding, so that the frame can be supported when the storage basket frame is assembled later. The outer edge molding structure can form an outer edge on the back plate that is protruding toward the front and back of the back plate, and the outer edge can increase the overall strength of the back plate.

[0018] 2. The injection liquid can be diverted to six arms through the injection liquid diverter plate, and then the six injection tubes can be used to inject the glue into the molding cavity from six points to increase the injection efficiency.

[0019] 3. Two relatively arranged hooks can form a buckle for clamping. The buckle molding structure can form a buckle on the upper part of the front side of the back panel when the back panel product is injection molded. The buckle plate molding structure can form U-shaped buckle plates on both sides of the back side of the back panel product for assembly of the back panel and the frame. The above structure can reduce the post-processing steps after the injection molding of the back panel, and can improve the production efficiency of the back panel.

[0020] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional view of the utility model;

[0022] Figure 2 It is a partial structural schematic diagram of the utility model;

[0023] Figure 3 It is a structural diagram of the lower template;

[0024] Figure 4It is a structural diagram of the upper template with a backboard product;

[0025] Figure 5 It is a structural diagram of the upper template.

[0026] In the figure, the upper template 1, the lower template 2, the back plate molding cavity 3, the hot runner multi-point pouring mechanism 4, the back plate product 5, the No. 1 through-trough body molding structure 6, the No. 2 through-trough body molding structure 7, the injection liquid diverter plate 8, the injection tube 9, the No. 1 trough body molding block 10, the No. 1 trough body molding groove 11, the groove 12, the arc-shaped protrusion 13, the lower trough body molding block 14, the upper trough body molding block 15, the support plate back plate molding groove 16, the support plate main body molding groove 17, the upper insert 18, the outer edge molding groove 19, the buckle molding structure 20, the buckle plate molding structure 21, the buckle molding groove 22, the buckle molding block 23, the arc-shaped chamfer 24, the lower insert 25, the buckle plate molding groove 26, the buckle plate molding block 27, the hook 28, and the U-shaped buckle plate 29. DETAILED DESCRIPTION

[0027] like Figure 1-Figure 5 As shown, a foldable storage basket backboard mold with a multi-point pouring hot runner structure includes an upper template 1 and a lower template 2, a backboard molding cavity 3 is provided between the upper template 1 and the lower template 2, a hot runner multi-point pouring mechanism 4 is provided on the upper side of the upper template 1, a No. 1 through-trough molding structure 6 and a No. 2 through-trough molding structure 7 are also provided between the upper template 1 and the lower template 2, which can form a through-trough body on the left and right sides of the backboard product 5, a support plate molding structure is also provided between the upper template 1 and the lower template 2, and an outer edge molding structure connected to the support plate molding structure is also provided at the edge of the backboard molding cavity 3.

[0028] In the utility model, the injection molding efficiency can be improved by injecting glue into the back plate molding cavity at multiple points through the hot runner multi-point pouring mechanism 4, the No. 1 through-groove molding structure 6 and the No. 2 through-groove molding structure 7 can form a through-groove on the back plate main body, the support plate molding structure can form a support plate at the bottom of the back plate during the back plate injection molding, so that the frame can be supported when the storage basket frame part is assembled later, and the outer edge molding structure can form an outer edge on the back plate that is protruding toward the front and back of the back plate, and the outer edge can increase the overall strength of the back plate.

[0029] Specifically, the hot runner multi-point pouring mechanism 4 includes an injection liquid diverter plate 8 with a Wang-shaped cross section, six injection tubes 9 are fixedly connected to the bottom of the injection liquid diverter plate 8, and the six injection tubes 9 are respectively fixed to the six arms of the injection liquid diverter plate 8, and the bottom of the injection tube 9 is connected to the back plate molding cavity 3. The injection liquid can be diverted to the six arms through the injection liquid diverter plate, and then the six injection tubes can be injected into the molding cavity from six points to increase the injection efficiency.

[0030] Specifically, the No. 1 through-trough body forming structure 6 includes a No. 1 trough body forming block 10 protruding from the bottom of the upper template 1 and a No. 1 trough body forming groove 11 recessed inwardly on the lower template 2. The cross-sections of the No. 1 trough body forming block 10 and the No. 1 trough body forming groove 11 are rectangular. The No. 1 trough body forming groove 11 is provided with a plurality of grooves 12 with arc-shaped cross-sections on the side away from the No. 2 through-trough body forming structure 7. The No. 1 trough body forming block 10 is provided with a plurality of arc-shaped protrusions 13 corresponding to the grooves 12. The No. 1 trough body forming block 10 on the upper template 1 and the No. 1 trough body forming groove 11 on the lower template can cooperate to form a handle groove penetrating the backboard body at the top of the backboard. The groove 12 in the No. 1 trough body forming groove 11 cooperates with the arc-shaped protrusion 13 on the No. 1 trough body forming block 10 to form an arc-shaped concave portion suitable for the human hand shape at the top of the handle groove.

[0031] Specifically, the second through-trough body forming structure 7 includes a plurality of lower trough body forming blocks 14 protruding from the lower template 2 and a plurality of upper trough body forming blocks 15 protruding from the upper template 1, and the plurality of lower trough body forming blocks 14 and the plurality of upper trough body forming blocks 15 are distributed in a rectangular array. The lower trough body forming blocks 14 on the lower template 2 and the upper trough body forming blocks 15 on the upper template 1 cooperate to form a plurality of through-trough bodies on the back plate body.

[0032] Specifically, the support plate forming structure includes a support plate back plate forming groove 16 which is recessed inwardly on the lower template 2 and a support plate main body forming groove 17 which is recessed inwardly on the upper template 1. The upper template 1 is also provided with an upper insert 18 connected to the support plate main body forming groove 17. The support plate main body forming groove 17 on the upper template 1 can form a support plate at the bottom of the front side of the back plate during injection molding of the back plate, and the support plate back plate forming groove 16 can form a bottom outer edge on the back side of the back plate.

[0033] Specifically, the outer edge forming structure includes an outer edge forming groove 19 which is correspondingly arranged on the upper template 1 and the lower template 2 and is arranged along the outer edge of the back plate forming cavity 3. The two ends of the outer edge forming groove 19 are respectively connected to the two ends of the support plate forming structure. The outer edge forming groove can form an outer edge with two raised ends at the outer edge of the back plate, thereby increasing the overall strength of the back plate.

[0034] Specifically, a buckle forming structure 20 capable of forming two oppositely arranged hooks 28 on the front of the backplane product 5 is provided between the upper template 1 and the lower template 2, and a gusset forming structure 21 capable of forming a U-shaped gusset 29 on the back of the backplane product 5 is provided between the upper template 1 and the lower template 2. The two oppositely arranged hooks 28 can form a buckle for clamping, and the buckle forming structure can form a buckle on the upper part of the front of the backplane during injection molding of the backplane product, and the gusset forming structure 21 can form U-shaped gussets on both sides of the back of the backplane product for assembly of the backplane and the frame. The above structure can reduce the post-processing steps after the injection molding of the backplane, and can improve the production efficiency of the backplane.

[0035] Specifically, the snap-on forming structure 20 includes two snap-on forming grooves 22 which are recessed inwardly and are arranged on the upper template 1. The snap-on forming groove 22 is arranged on the side of the No. 1 through-groove forming structure 6 away from the No. 2 through-groove forming structure 7. A snap-on forming block 23 is protrudingly arranged on the lower template 2. The snap-on forming block 23 is inserted into the snap-on forming groove 22. Two symmetrically arranged hook forming grooves are formed between the two sides of the snap-on forming block 23 and the inner wall of the snap-on forming groove 22. Arc chamfers 24 are arranged on both sides of the top of the snap-on forming block 23. Two lower inserts 25 are fixed to the lower template 2 by bolts, and the snap-on forming block 23 is located at the top of the lower insert 25. After the snap forming block 23 is inserted into the snap forming groove 22, two hook forming grooves that can directly form hooks during back panel injection molding will be formed between the two sides of the snap forming block 23 and the inner wall of the snap forming groove 22. The arc chamfers on both sides of the top of the snap forming block 23 can form a protrusion on the inner side of the top of the hook to clamp the object inserted between the two hooks. A lower insert 25 fixed to the lower template by bolts is provided so that the snap forming block can be disassembled and replaced, which can reduce the later cost.

[0036] Specifically, the gusset plate forming structure 21 includes a plurality of gusset plate forming grooves 26 symmetrically arranged on both sides of the lower template 2 and recessed inwardly, and a plurality of gusset plate forming blocks 27 protruding from the upper template 1 that can be inserted into the gusset plate forming grooves 26, and the two ends of the gusset plate forming blocks 27 abut against the inner walls of the two sides of the gusset plate forming grooves 26, and a U-shaped gusset plate forming groove is formed between the gusset plate forming blocks 27 and the gusset plate forming grooves 26. After the gusset plate forming blocks 27 are inserted into the gusset plate forming grooves 26, a U-shaped gusset plate forming groove can be formed, and the U-shaped gusset plate forming groove can form a U-shaped gusset plate on the back of the backplane product for assembly of the backplane and the frame.

[0037] The working principle of the utility model is as follows: the injection molding efficiency can be improved by injecting glue into the back plate molding cavity at multiple points through the hot runner multi-point injection mechanism 4, the No. 1 through-trough molding structure 6 and the No. 2 through-trough molding structure 7 can form a through-trough on the back plate body, the support plate molding structure can form a support plate at the bottom of the back plate during the back plate injection molding, so that the frame can be supported when the basket storage frame part is assembled later, the outer edge molding structure can form an outer edge protruding toward the front and back of the back plate on the back plate, and the outer edge can increase the overall strength of the back plate, the injection liquid can be diverted to the six arms through the injection liquid diverter plate, and then the six injection tubes can be used to inject glue into the molding cavity from six points to increase the injection molding efficiency;

[0038] The No. 1 trough body forming block 10 on the upper template 1 and the No. 1 trough body forming groove 11 on the lower template can cooperate to form a handle groove that runs through the backboard body at the top of the backboard, the groove 12 in the No. 1 trough body forming groove 11 cooperates with the arc-shaped protrusion 13 on the No. 1 trough body forming block 10 to form an arc-shaped concave portion suitable for the human hand shape at the top of the handle groove, the lower trough body forming block 14 on the lower template 2 and the upper trough body forming block 15 on the upper template 1 can cooperate to form a number of through trough bodies on the backboard body, the support plate body forming groove 17 on the upper template 1 can form a support plate at the bottom of the front side of the backboard during injection molding of the backboard, the support plate backboard forming groove 16 can form a bottom outer edge on the back side of the backboard, and the outer edge forming groove can form an outer edge with two raised ends on the outer edge of the backboard, thereby increasing the overall strength of the backboard;

[0039] The two relatively arranged hooks 28 can form a buckle for clamping. The buckle molding structure can form a buckle on the upper part of the front of the back panel when the back panel product is injection molded. The buckle plate molding structure 21 can form a U-shaped buckle plate on both sides of the back of the back panel product for assembly of the back panel and the frame. The above structure can reduce the post-processing steps after the injection molding of the back panel, and can improve the production efficiency of the back panel. After the buckle molding block 23 is inserted into the buckle molding groove 22, two buckle molding blocks 23 and the inner wall of the buckle molding groove 22 are formed. The hook molding groove of the hook is directly formed during the injection molding of the back panel. The arc chamfers on both sides of the top of the snap molding block 23 can form a bulge on the inner side of the top of the hook to clamp the object inserted between the two hooks. The lower insert 25 fixed to the lower template by bolts is arranged so that the snap molding block can be disassembled and replaced, which can reduce the later cost. After the gusset plate molding block 27 is inserted into the gusset plate molding groove 26, a U-shaped gusset plate molding groove can be formed. The U-shaped gusset plate molding groove can form a U-shaped gusset plate on the back of the back panel product for assembly of the back panel and the frame.

[0040] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0041] Although this article uses the upper template 1, lower template 2, back plate molding cavity 3, hot runner multi-point pouring mechanism 4, back plate product 5, No. 1 through-trough molding structure 6, No. 2 through-trough molding structure 7, injection liquid diverter plate 8, injection tube 9, No. 1 trough molding block 10, No. 1 trough molding groove 11, groove 12, arc-shaped protrusion 13, lower trough molding block 14, upper trough molding block 15, support plate back plate molding groove 16, support plate main body molding groove 17, upper insert 18, outer edge molding groove 19, snap molding structure 20, buckle plate molding structure 21, snap molding groove 22, snap molding block 23, arc chamfer 24, lower insert 25, buckle plate molding groove 26, buckle plate molding block 27, hook 28, U-shaped buckle plate 29, etc. more frequently, these terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A foldable storage basket back plate mold with a multi-point hot runner structure, comprising an upper mold plate (1) and a lower mold plate (2), characterized in that: A backplane forming cavity (3) is provided between the upper template (1) and the lower template (2). A hot runner multi-point feeding mechanism (4) is arranged on the upper side of the upper template (1). Between the upper template (1) and the lower template (2), there is also a first through-groove forming structure (6) and a second through-groove forming structure (7) that can form through grooves on the left and right sides of the backplane product (5). Between the upper template (1) and the lower template (2), there is also a support plate forming structure that can form a support plate at the bottom of the backplane product (5). An outer edge forming structure connected to the support plate forming structure is also provided at the edge of the backplane forming cavity (3).

2. The foldable storage basket back plate mold with a multi-point pouring hot runner structure according to claim 1, characterized in that: The hot runner multi-point feeding mechanism (4) includes an injection liquid distribution plate (8) with a cross-section in the shape of a king character. Six injection pipes (9) are fixedly connected to the bottom of the injection liquid distribution plate (8), and the six injection pipes (9) are respectively fixed on the six arms of the injection liquid distribution plate (8). The bottom of the injection pipe (9) is connected to the backplane forming cavity (3).

3. The foldable storage basket back plate mold with a multi-point pouring hot runner structure according to claim 2, characterized in that: The first through-groove forming structure (6) includes a first groove forming block (10) protruding from the bottom of the upper template (1) and a first groove forming groove (11) recessed inward on the lower template (2). The cross-sections of the first groove forming block (10) and the first groove forming groove (11) are rectangular. A number of grooves (12) with an arc-shaped cross-section are arranged on the side of the first groove forming groove (11) away from the second through-groove forming structure (7). A number of arc-shaped protrusions (13) corresponding to the grooves (12) are arranged on the first groove forming block (10).

4. The foldable storage basket back plate mold with a multi-point hot runner structure according to claim 2, characterized in that: The second through-groove forming structure (7) includes a number of lower groove forming blocks (14) protruding from the lower template (2) and a number of upper groove forming blocks (15) protruding from the upper template (1). The number of lower groove forming blocks (14) and the number of upper groove forming blocks (15) are arranged in a rectangular array.

5. The foldable storage basket back plate mold with a multi-point pouring hot runner structure according to claim 1, characterized in that: The support plate forming structure includes a support plate backplane forming groove (16) recessed inward on the lower template (2) and a support plate main body forming groove (17) recessed inward on the upper template (1). An upper insert (18) connected to the support plate main body forming groove (17) is also provided on the upper template (1).

6. The foldable storage basket back plate mold with a multi-point pouring hot runner structure according to claim 5, characterized in that: The outer edge forming structure includes outer edge forming grooves (19) correspondingly arranged on the upper template (1) and the lower template (2) and circumferentially arranged along the outer edge of the backplane forming cavity (3). The two ends of the outer edge forming groove (19) are respectively connected to the two ends of the support plate forming structure.

7. The foldable storage basket back plate mold with a multi-point pouring hot runner structure according to claim 1, characterized in that: A buckle forming structure (20) capable of forming two oppositely arranged hooks (28) on the front of the backplane product (5) is also provided between the upper template (1) and the lower template (2). A buckle forming structure (21) capable of forming a U-shaped buckle plate (29) on the back of the backplane product (5) is also provided between the upper template (1) and the lower template (2).

8. The foldable storage basket back plate mold with a multi-point pouring hot runner structure according to claim 7, characterized in that: The buckle forming structure (20) comprises two buckle forming grooves (22) which are recessed inwardly and arranged on the upper template (1); the buckle forming groove (22) is arranged on the side of the No. 1 through-groove forming structure (6) away from the No. 2 through-groove forming structure (7); a buckle forming block (23) is protrudingly arranged on the lower template (2); the buckle forming block (23) is inserted into the buckle forming groove (22); two symmetrically arranged hook forming grooves are formed between the two sides of the buckle forming block (23) and the inner wall of the buckle forming groove (22); arc chamfers (24) are arranged on both sides of the top of the buckle forming block (23).

9. The foldable storage basket back plate mold with a multi-point pouring hot runner structure according to claim 8, characterized in that: Two lower inserts (25) are fixed to the lower template (2) by bolts, and the buckle forming block (23) is located at the top of the lower inserts (25).

10. The foldable storage basket back plate mold with a multi-point pouring hot runner structure according to claim 9, characterized in that: The gusset plate forming structure (21) comprises a plurality of gusset plate forming grooves (26) symmetrically arranged on both sides of the lower template (2) and recessed inwardly, and a plurality of gusset plate forming blocks (27) protruding from the upper template (1) and capable of being inserted into the gusset plate forming grooves (26), the two ends of the gusset plate forming blocks (27) abutting against the inner walls of the gusset plate forming grooves (26) on both sides, and a U-shaped gusset plate forming groove is formed between the gusset plate forming blocks (27) and the gusset plate forming grooves (26).

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