CN214184820U - Hydraulic forming device for large-diameter thin-wall small-bending-radius bent pipe with straight sections at two ends - Google Patents
Hydraulic forming device for large-diameter thin-wall small-bending-radius bent pipe with straight sections at two ends Download PDFInfo
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- CN214184820U CN214184820U CN202021856078.0U CN202021856078U CN214184820U CN 214184820 U CN214184820 U CN 214184820U CN 202021856078 U CN202021856078 U CN 202021856078U CN 214184820 U CN214184820 U CN 214184820U
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Abstract
The utility model discloses a hydraulic forming device of major diameter thin wall small bending radius return bend of straight section is taken at both ends belongs to thin wall tubular product return bend technical field. The forming device comprises an upper die, a lower die, an upper fixing plate, a lower fixing plate, an insert with damping ribs, a left push head and a right push head; placing a bent pipe blank in a mold cavity formed after the upper mold and the lower mold are closed; the insert with the damping ribs is arranged in the circumferential direction of the cavity and used for fixing a bent pipe blank placed in the cavity; the upper fixing plate and the lower fixing plate are respectively arranged above the upper die and below the lower die; the left push head and the right push head are respectively butted with two end parts of a bent pipe blank placed in the cavity and used for applying axial pressure to the two end parts of the bent pipe blank and simultaneously sealing the cavity. The forming device has good forming effect on the bent pipe with the long straight section and the small bending radius at the two ends, the forming process is simple, the efficiency is high, and the reduction rate of the produced parts is low.
Description
Technical Field
The utility model relates to a thin wall tubular product return bend technical field, concretely relates to hydraulic forming device of major diameter thin wall small bending radius return bend of straight section is taken at both ends.
Background
The bending forming generally adopts the technical methods of numerical control bending, ball pushing bending, liquid filling bending, splicing welding after half shell drawing and the like. The bending radius R of the numerical control pipe bending process is generally equal to
(
Tube diameter) when bending radius
In time, the numerical control pipe bending efficiency is low, the reliability of parts is poor, the inner wall of the elbow is scratched, the opening part is easy to be elliptical, and the bending radius is large
It cannot be bent. The ball-pushing elbow process has low efficiency and poor reliability, although the bending radius can be formed
But cannot form a bent pipe having straight sections of 20mm or more at both ends and a bending radius
And the inner side is easy to be positioned when the thickness of the pipe wall is less than 1.5mmAnd (4) wrinkling. The liquid-filled pipe bending process can form the bending radius
The mould increases along with the increase of the length of the straight sections at the two ends of the bent pipe, the thinning of the outer R is increased along with the increase of the length of the straight sections at the two ends of the bent pipe, and the defects of wrinkling, buckling, cracking and the like can occur. The pipe bending process of half-shell drawing and tailor welding adopts a split manufacturing method, firstly uses a plate material to form a half of the bent pipe, and then welds the bent pipe, and the method has low efficiency and poor size precision and reliability of parts.
SUMMERY OF THE UTILITY MODEL
For the above-mentioned weak point that exists when overcoming the thin wall return bend that takes shape, the utility model aims to provide a hydraulic forming device of major diameter thin wall small bending radius return bend of straight section is taken at both ends, and this forming device has good shaping effect to the return bend that both ends have long straight section, small bending radius.
In order to achieve the above object, the utility model adopts the following technical scheme:
the large-diameter thin-wall small-bending-radius elbow with the straight section is characterized in that two ends of an elbow product are provided with the straight sections exceeding 20mm, the outer diameter of the elbow is more than or equal to 95mm, the wall thickness of the elbow is more than or equal to 0.8mm and less than or equal to 2mm, and the bending radius of the elbow which is 0.5 times and less than or equal to the diameter of the elbow is less than or equal to the diameter of the elbow; the bending angle of the bent pipe is 90-170 degrees.
The lengths of straight sections at two ends of the bent pipe product are equal or unequal, and the bent pipe can have only one bend or a plurality of bends.
The hydraulic forming device for the large-diameter thin-wall small-bending-radius elbow with the straight section comprises an upper die, a lower die, an upper fixing plate, a lower fixing plate, an insert with a damping rib, a left push head and a right push head; wherein: inner grooves are respectively formed in the inner surfaces of the upper die and the lower die, a die cavity is formed by the two inner grooves after die assembly, and a bent pipe blank is placed in the die cavity; the insert blocks with damping ribs are arranged at the positions of the circumferential direction of the cavity, which correspond to the straight sections at the two ends of the bent pipe product, and are used for fixing a bent pipe blank placed in the cavity; the upper fixing plate and the lower fixing plate are respectively arranged above the upper die and below the lower die; the left push head and the right push head are respectively butted with two end parts of a bent pipe blank placed in the cavity and used for applying axial pressure to the two end parts of the bent pipe blank and simultaneously sealing the cavity.
The structure of the cavity is adapted to the shape of a bent pipe product to be formed, and two ports of the cavity are of an open structure; and after the bent pipe blank is placed into the cavity and the die is closed, the distance from the two ends of the bent pipe blank to the two ports of the cavity is 1-2 cm.
The left push head and the right push head respectively extend into two ports of the cavity and are connected with two ends of a bent pipe blank placed in the cavity, the diameters of the left push head and the right push head are equal to the inner diameters of the two ports of the cavity, so that the part extending into the two ports of the cavity can be in close contact with the inner surface of the port, and the cavity is sealed.
The insert with the damping ribs comprises a left damping rib insert and a right damping rib insert which are arranged on an upper die and a lower die, the left damping rib insert and the right damping rib insert are both provided with inner concave surfaces, after the upper die and the lower die are closed, the inner concave surfaces of the left damping rib insert on the upper die and the lower die are matched with one end straight section of a clamping bent pipe blank, and the inner concave surfaces of the right damping rib insert on the upper die and the lower die are matched with the other end straight section of the clamping bent pipe blank.
The inner concave surfaces of the left damping rib insert and the right damping rib insert are respectively provided with 2-4 damping ribs, and the damping ribs are rectangular, square, circular, oval or rhombic bulges; the height of the protrusion is 1mm-5 mm.
The shapes of the inner concave surfaces of the left damping rib insert and the right damping rib insert are matched with the outer diameter of the bent pipe blank; the shape, the number and the distribution position of the damping ribs can be designed according to factors such as the material of the tube blank, the bending radius and the like.
The method for forming the large-diameter thin-wall small-bending-radius bent pipe with the straight section by using the hydraulic forming device sequentially comprises the following steps: preparing a straight pipe blank, numerically controlling a bent pipe, putting the bent pipe blank into a mould, closing the mould, pushing a head to feed, filling liquid and pressurizing, taking a pipe and cutting, and specifically comprising the following steps of:
(1) preparing a straight tube blank: the outer diameter of the straight pipe blank is smaller than that of the finished bent pipe, the wall thickness of the straight pipe blank is greater than or equal to that of the finished bent pipe, and the straight pipe blank is a seamed pipe or a seamless pipe;
(2) carrying out numerical control pipe bending: forming a bent pipe blank after the straight pipe blank passes through a numerical control bent pipe; bending parameters such as bending radius, bending angle and the like need to be adjusted to form a bent pipe blank so as to ensure that the bent pipe blank can be smoothly placed into a hydraulic forming die;
(3) placing the die into a mold and closing the mold: putting the bent pipe blank obtained in the step (2) into a lower die of a hydraulic forming device, moving an upper die downwards to be completely closed with the lower die, and clamping the bent pipe blank between the upper die and the lower die through the extrusion effect of the inserts with damping ribs on the upper die and the lower die on straight sections at two ends of the bent pipe blank;
(4) pushing and feeding: the left push head and the right push head respectively move towards the inner direction of the mould along the axes of the straight sections at the two ends of the bent pipe, and the two ends of the bent pipe blank are clamped between the mould and the push heads, so that the sealing effect of the two ends of the bent pipe blank is realized;
(5) liquid filling and pressurizing: applying a mold closing force to the mold to enable the upper mold and the lower mold to be tightly attached, and applying an axial force to the pushing head to enable two ends of the bent pipe blank to be tightly attached to the mold, so that a closed space is formed inside the bent pipe blank; the hydraulic system fills liquid into the bent pipe blank through a liquid inlet channel in the push head, and gradually increases the liquid pressure, so that the bent pipe blank is gradually deformed and attached to a die under the action of the liquid pressure to form a hydroformed pipe blank;
(6) opening the die and taking out the tube: after opening the die, taking out the hydroformed tube blank;
(7) cutting: cutting useless parts at two ends of the hydroformed tube blank, and obtaining the remaining middle part as a final bent tube product.
In the step (2), the bending radius R of the bent pipe blank is as follows: the bending radius R of the bent pipe blank is not less than 1.1D and not more than 1.5D, and D is the outer diameter of the bent pipe blank; the expansion amplitude of the bent pipe blank is 10-23%, and the expansion amplitude of the bent pipe blank is (outer diameter of a bent pipe product-outer diameter of the bent pipe blank)/outer diameter of the bent pipe blank; the expansion amplitude is less than 10%, the wrinkling is easy, and the R is broken when the expansion amplitude exceeds 23%.
In the step (3), when the bent pipe blank is placed into the lower die of the hydraulic forming device, the inner R of the bent pipe blank is in contact with the inner R of the die cavity (the inner R of the die cavity refers to the position in the die cavity corresponding to the inner R of the bent pipe finished product) to be in the optimal state, and the bending radius R is as large as possible as good as possible on the premise that the bent pipe blank cannot be exposed out of the die cavity.
The utility model has the advantages and beneficial effects as follows:
1. use the utility model discloses in the device forming process, go up the mould downstream, with the lower mould closed completely, because last lower mould all is equipped with the inserting of taking the damping muscle, through the extrusion of inserting at the banding damping muscle of upper and lower mould to return bend base both ends, press from both sides the return bend base tightly between upper and lower mould, realize fixedly.
2. The utility model discloses the mould of hydroforming process adopts the structure of inserting that has the damping muscle, and the damping muscle height design on inserting is 1mm-5mm, if does not adopt the damping muscle, or the highly too high or low of damping muscle all can lead to the return bend product to appear corrugating when taking shape.
3. The utility model discloses at the forming process, the bend radius R of blank return bend is: the bending radius R is less than or equal to 1.5D and is less than or equal to 1.1D, and D is the outer diameter of the blank bent pipe; when the bent pipe blank is placed in the die cavity, the R in the blank pipe is just contacted with the R in the die cavity, and the best state is achieved, and the bending radius R is increased as much as possible on the premise that the blank pipe cannot be exposed out of the die cavity.
4. The utility model has high efficiency and low part thinning rate; the parts can be produced in batch, and the yield is high.
Drawings
FIG. 1 is a schematic view of parameters of a finished elbow; wherein:
is the diameter of the bent pipe product, R is the bending radius of the bent pipe, α is the bending angle, L1 and L2 are the lengths of the straight sections at both ends, respectively, and define the inside and outside of the bent pipe.
Fig. 2 shows a lower mold and a pusher.
Fig. 3 is an insert with circular damping ribs.
Fig. 4 is an insert with rectangular damping ribs.
Fig. 5 is a straight tube blank.
Fig. 6 is a bent pipe blank.
Fig. 7 is a schematic view of the bent pipe blank being placed into the lower mold.
FIG. 8 is a schematic view of mold clamping.
Fig. 9 is a schematic diagram of the pusher feed.
FIG. 10 is a schematic view of the mold after filling and pressurizing and opening.
Fig. 11 shows the tube blank after hydroforming.
Fig. 12 is the final formed part after cutting.
Fig. 13 shows two bent tube blanks.
Fig. 14 is a schematic view of two curved bent-tube blanks being placed into two bend-down dies.
Fig. 15 is a schematic view of two curved elbow tubes after filling and pressurizing and opening the mold.
In the figure: 1-lower fixing plate, 2-lower die, 3-left damping rib insert, 4-right damping rib insert, 5-left push head, 6-right push head, 7-straight tube blank, 8-bent tube blank, 9-upper die, 10-upper fixing plate, 11-hydroformed tube blank, and 12-bent tube finished product.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
On the basis of numerical control return bend and hydroforming return bend, the utility model provides a device of the minor bend radius return bend of major diameter thin wall of straight section is taken at shaping both ends.
As shown in figure 1, both ends of the bent pipe to be formed in the utility model are provided with straight sections exceeding 20mm, the outer diameter of the bent pipe is more than or equal to 95mm, the wall thickness of the bent pipe is 0.8-2 mm, and the bending radius of the bent pipe product is 0.5-1 times of the diameter of the bent pipe product; the bending angle of the bent pipe product is 90-170 degrees. The lengths of straight sections at two ends of the bent pipe product are equal or unequal, and the bent pipe can have only one bend or a plurality of bends.
As shown in fig. 2-6, the hydroforming apparatus for forming a large-diameter thin-walled small-bending-radius elbow with a straight section of the present invention comprises an upper die 9, a lower die 2, an upper fixing plate 10, a lower fixing plate 1, an insert with a damping rib, a left push head 5 and a right push head 6; wherein: inner grooves are respectively formed in the inner surfaces of the upper die and the lower die, a die cavity is formed by the two inner grooves after die assembly, and a bent pipe blank is placed in the die cavity; the insert blocks with damping ribs are arranged at the positions of the circumferential direction of the cavity, which correspond to the straight sections at the two ends of the bent pipe product, and are used for fixing a bent pipe blank placed in the cavity; the upper fixing plate and the lower fixing plate are respectively arranged above the upper die and below the lower die; the left push head and the right push head are respectively butted with two end parts of a bent pipe blank placed in the cavity and used for applying axial pressure to the two end parts of the bent pipe blank and simultaneously sealing the cavity.
The structure of the die cavity is adapted to the shape of a bent pipe product to be formed, and two ports of the die cavity are of an open structure. And after the bent pipe blank is placed into the cavity and the die is closed, the distance from the two ends of the bent pipe blank to the two ports of the cavity is 1-2 cm.
The left push head and the right push head respectively extend into two ports of the cavity and are connected with two ends of a bent pipe blank placed in the cavity, the diameters of the left push head and the right push head are equal to the inner diameters of the two ports of the cavity, so that the part extending into the two ports of the cavity can be in close contact with the inner surface of the port, and the cavity is sealed.
The insert with the damping ribs comprises a left damping rib insert and a right damping rib insert which are arranged on an upper die and a lower die, the left damping rib insert and the right damping rib insert are both provided with inner concave surfaces, after the upper die and the lower die are closed, the inner concave surfaces of the left damping rib insert on the upper die and the lower die are matched with one end straight section of a clamping bent pipe blank, and the inner concave surfaces of the right damping rib insert on the upper die and the lower die are matched with the other end straight section of the clamping bent pipe blank. The sizes of the inner concave surfaces of the left damping rib insert and the right damping rib insert are matched with the outer diameter of the bent pipe blank; the inner concave surfaces of the left damping rib insert and the right damping rib insert are respectively provided with 2-4 damping ribs, the damping ribs are rectangular, square, circular, oval or rhombic bulges, and the height of the bulges is 1mm-5 mm. The shape, the number and the distribution position of the damping ribs can be designed according to factors such as the material of the tube blank, the bending radius and the like.
Example 1:
the forming of the bent pipe is carried out by adopting the hydraulic forming device, and the process is as follows:
1. selecting a straight pipe blank: as shown in fig. 5, the outer diameter of the straight pipe blank 7 is smaller than the outer diameter of the final bent pipe 12, the thickness of the straight pipe blank 7 is equal to or greater than the thickness of the final bent pipe 12, and the straight pipe blank 7 may be a seamed pipe or a seamless pipe.
2. Carrying out numerical control pipe bending: as shown in fig. 6, the straight pipe billet 7 is subjected to numerical control bending to form a bent pipe billet 8.
In this example, the bend radius R of the bent pipe blank is 1.2D, D is the outer diameter of the bent pipe blank, and the bulging of the bent pipe blank is 18%.
3. Placing into a mold: as shown in fig. 7, the bent pipe blank 8 is placed in a hydroforming die, typically the lower die 2. When the bent pipe blank 8 is put in, the R in the bent pipe blank is just contacted with the R in the die cavity; the upper die 2 and the lower die 2 are both provided with a left damping rib insert 3 and a right damping rib insert 4, and the height of the upper damping rib insert is 3 mm.
4. Die assembly: as shown in fig. 8, the upper die moves downward, including the die 9 and the upper fixing plate 10 and two inserts with damping ribs (hidden in the drawing and not shown), until the upper die 9 and the lower die 2 are completely closed and a force F1 is applied to the upper die 9, clamping the bent pipe blank 8 between the upper die and the lower die.
5. Pushing and feeding: as shown in fig. 9, the pushing head 5 and the pushing head 6 move towards the inside of the mold along the axes of the straight line sections at the two ends of the bent pipe, so as to clamp the two ends of the bent pipe blank 8 between the mold and the pushing head, clamp the left end of the bent pipe blank 8 between the mold 2, the mold 9 and the pushing head 5, and clamp the right end of the bent pipe blank 8 between the mold 2, the mold 9 and the pushing head 6, thereby realizing the sealing function at the two ends of the bent pipe blank 8.
6. Liquid filling and pressurizing: as shown in fig. 9, a certain mold clamping force F2 is applied to the mold 9 to make the upper and lower molds closely contact each other, and certain axial forces F3 and F4 are applied to the pusher 5 and the pusher 6 to make both ends of the bent pipe blank 8 closely contact the mold, so that a closed space is formed inside the bent pipe blank. The hydraulic system fills liquid into the bent pipe blank 8 through a channel in the push head, the liquid pressure is gradually increased, and the bent pipe blank 8 is gradually deformed and attached to a die under the action of the liquid pressure to form a hydroformed pipe blank 11.
7. Opening the die and taking out the tube: after opening the die, as shown in fig. 10, the hydroformed blank tube 11 is taken out as shown in fig. 11.
8. Cutting: the blank 11 is cut at both ends and the remaining central portion is the final bent pipe part 12, as shown in fig. 12. The bent pipe part real product has no problems of outer side fracture and inner side corrugation.
Example 2:
the difference from the embodiment 1 is that: the bent pipe product is changed into two bends from one bend, and the rest can be done in the same way.
1. Selecting a straight pipe blank: as shown in fig. 5.
2. Carrying out numerical control pipe bending: as shown in fig. 13.
3. Placing into a mold: as shown in fig. 14.
4. Die assembly: as shown in fig. 8.
5. Pushing and feeding: as shown in fig. 9.
6. Liquid filling and pressurizing: as shown in fig. 9.
7. Opening the die and taking out the tube: after opening the mold, as shown in fig. 15.
8. Cutting: may be cut into a bend having two bends or into two bends having only one bend.
Comparative example 1:
the difference from the embodiment 1 is that:
the bulging of the bent tube blank was designed to be 8%, and the other procedures were the same as in example 1.
The formed elbow product of this example had wrinkles at R in the elbow.
Comparative example 2:
the difference from the embodiment 1 is that:
the bulging of the bent tube blank was designed to be 25%, and the other procedures were the same as in example 1.
The bend product formed in this example exhibited cracking at the bend outer R.
Comparative example 3:
the difference from the embodiment 1 is that:
in the hydroforming apparatus, the height of the damping rib of the insert was set to 0.5mm, and the other processes were the same as in example 1.
The formed elbow product of this example had wrinkles at R in the elbow.
Claims (7)
1. The utility model provides a hydraulic forming device of major diameter thin wall minor bend radius return bend of straight section in area which characterized in that: the hydraulic forming device comprises an upper die, a lower die, an upper fixing plate, a lower fixing plate, an insert with damping ribs, a left push head and a right push head; wherein: inner grooves are respectively formed in the inner surfaces of the upper die and the lower die, a die cavity is formed by the two inner grooves after die assembly, and a bent pipe blank is placed in the die cavity; the insert blocks with damping ribs are arranged at the positions of the circumferential direction of the cavity, which correspond to the straight sections at the two ends of the bent pipe product, and are used for fixing a bent pipe blank placed in the cavity; the upper fixing plate and the lower fixing plate are respectively arranged above the upper die and below the lower die; the left push head and the right push head are respectively butted with two end parts of a bent pipe blank placed in the cavity and used for applying axial pressure to the two end parts of the bent pipe blank and simultaneously sealing the cavity.
2. The hydroforming apparatus according to claim 1, further comprising a pair of spaced apart, straight, thin-walled, large bend radius bends, wherein: the structure of the cavity is adapted to the shape of a bent pipe product to be formed, and two ports of the cavity are of an open structure; and after the bent pipe blank is placed into the cavity and the die is closed, the distance from the two ends of the bent pipe blank to the two ports of the cavity is 1-2 cm.
3. The hydroforming apparatus according to claim 2, further comprising a pair of spaced apart, straight, thin-walled, large bend radius bends, wherein: the left push head and the right push head respectively extend into two ports of the cavity and are connected with two ends of a bent pipe blank placed in the cavity, the diameters of the left push head and the right push head are equal to the inner diameters of the two ports of the cavity, so that the part extending into the two ports of the cavity can be in close contact with the inner surface of the port, and the cavity is sealed.
4. The hydroforming apparatus according to claim 1, further comprising a pair of spaced apart, straight, thin-walled, large bend radius bends, wherein: the insert with the damping ribs comprises a left damping rib insert and a right damping rib insert which are arranged on an upper die and a lower die, the left damping rib insert and the right damping rib insert are both provided with inner concave surfaces, after the upper die and the lower die are closed, the inner concave surfaces of the left damping rib insert on the upper die and the lower die are matched with one end straight section of a clamping bent pipe blank, and the inner concave surfaces of the right damping rib insert on the upper die and the lower die are matched with the other end straight section of the clamping bent pipe blank.
5. The hydroforming apparatus according to claim 4 having a straight section of a large diameter thin wall bend with a small bend radius, wherein: the inner concave surfaces of the left damping rib insert and the right damping rib insert are respectively provided with 2-4 damping ribs, and the damping ribs are rectangular, circular, oval or rhombic bulges; the height of the protrusion is 1mm-5 mm.
6. The hydroforming apparatus according to claim 1, further comprising a pair of spaced apart, straight, thin-walled, large bend radius bends, wherein: both ends of the bent pipe product are provided with straight sections with diameters exceeding 20mm, the outer diameter of the bent pipe is more than or equal to 95mm, the wall thickness of the bent pipe is more than or equal to 0.8mm and less than or equal to 2mm, and the diameter of the bent pipe which is 0.5 times is less than or equal to the bending radius of the bent pipe and less than or equal to the diameter of the bent pipe; the bending angle of the bent pipe is 90-170 degrees.
7. The hydroforming apparatus according to claim 1, further comprising a pair of spaced apart, straight, thin-walled, large bend radius bends, wherein: the lengths of straight sections at two ends of the bent pipe product are equal or unequal, and the bent pipe product is provided with one bend or a plurality of bends.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021856078.0U CN214184820U (en) | 2020-08-31 | 2020-08-31 | Hydraulic forming device for large-diameter thin-wall small-bending-radius bent pipe with straight sections at two ends |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021856078.0U CN214184820U (en) | 2020-08-31 | 2020-08-31 | Hydraulic forming device for large-diameter thin-wall small-bending-radius bent pipe with straight sections at two ends |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114704699A (en) * | 2022-04-07 | 2022-07-05 | 济南迈科管道科技有限公司 | Pipeline connecting piece for direction-changing connection and production equipment and method thereof |
| CN116371983A (en) * | 2023-06-06 | 2023-07-04 | 山东鲁旺机械设备有限公司 | Pipe fitting bending device for building hanging basket |
| CN114704699B (en) * | 2022-04-07 | 2024-04-26 | 济南迈科管道科技有限公司 | Pipeline connecting piece for turning connection and production equipment and method thereof |
-
2020
- 2020-08-31 CN CN202021856078.0U patent/CN214184820U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114704699A (en) * | 2022-04-07 | 2022-07-05 | 济南迈科管道科技有限公司 | Pipeline connecting piece for direction-changing connection and production equipment and method thereof |
| CN114704699B (en) * | 2022-04-07 | 2024-04-26 | 济南迈科管道科技有限公司 | Pipeline connecting piece for turning connection and production equipment and method thereof |
| CN116371983A (en) * | 2023-06-06 | 2023-07-04 | 山东鲁旺机械设备有限公司 | Pipe fitting bending device for building hanging basket |
| CN116371983B (en) * | 2023-06-06 | 2023-08-18 | 山东鲁旺机械设备有限公司 | Pipe fitting bending device for building hanging basket |
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