Blow molding equipment and automatic closing and taking-out method thereof

Abstract

The present invention discloses a blow molding equipment and an automatic closing and taking method, comprising a frame, a mouth die is installed on the top of the frame, the mouth die feed port is connected with the feed channel, a clamping device is installed below the mouth die outlet, and the characteristics are: it also comprises a supporting device, a closing device and a taking device, the supporting device can rotate to the bottom of the mouth die and open the bag of the material blank shot from the mouth die, the closing device is used to close the bottom of the material blank, the clamping device is used to shape the material blank moved down into a blow molded part, and the taking device is used to clamp the top of the blow molded part and take away the blow molded part. When the blow molding equipment is working, the mutual cooperation of the clamping device, the supporting device, the closing device and the taking device can complete the shooting, supporting, closing, closing and taking work in sequence, with a high degree of automation, greatly improving the work efficiency, especially the closing operation is completed automatically, avoiding manual closing, not only improving the closing quality, but also greatly improving the safety.

Description

Technical Field

[0001] The invention relates to plastic mechanical equipment, in particular to a blow molding equipment and an automatic closing and taking method thereof. Background Art

[0002] Blow molding, also known as hollow blow molding, is a rapidly developing plastic processing method. The tubular plastic preform obtained by extrusion or injection molding of thermoplastic resin is placed in a split mold while hot (or heated to a softened state). After the mold is closed, compressed air is immediately introduced into the preform to inflate the plastic preform and cling to the inner wall of the mold. After cooling and demolding, various hollow products are obtained. The hollow blow molding machine is the key equipment of this blow molding process. With the rapid development of the plastics industry, the functional requirements of the hollow blow molding machine are becoming more and more complete in order to meet the shape diversification of the production of hollow blow molded products and the simplification of personnel operation. Various blow molding equipment are disclosed in the prior art. The feed port of the die is connected to the feed channel, and a clamping device is installed below the discharge port of the die. After the die shoots the material downward, the bag mouth of the material needs to be closed. At present, the closing is usually done manually, which not only cannot ensure the product quality, but also the workers are close to the clamping device when operating, which poses a great safety hazard. In addition, before the bag mouth of the blank is closed, the bag mouth needs to be fully opened. If it is not fully opened, it will affect the normal closing operation, thereby affecting the quality of the product and even generating waste. In addition, the existing blow molding equipment does not have a special material taking device, which not only has a low material taking efficiency, but also has safety hazards. In summary, the existing blow molding equipment needs to be further improved. Summary of the invention

[0003] The first technical problem to be solved by the present invention is to provide a blow molding equipment with safe and reliable operation and high degree of automation in view of the above-mentioned existing technical status.

[0004] The second technical problem to be solved by the present invention is to provide an automatic closing and taking-out method for blow molding equipment with a high degree of automation in view of the above-mentioned existing technical status.

[0005] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: the blow molding equipment includes a frame, a die is installed on the top of the frame, the die feed port is connected to the feed channel, and a clamping device is installed below the die outlet, characterized in that it also includes a supporting device, a closing device and a taking device, the supporting device can rotate to the bottom of the die and support the bag of the blank shot from the die, the closing device is used to close the bottom of the blank, the clamping device is used to shape the blank moved down into a blow molded part, and the taking device is used to clamp the top of the blow molded part and take away the blow molded part.

[0006] The material supporting device can have a variety of structures. Preferably, the material supporting device includes a supporting frame, a first telescopic cylinder, a connecting arm, a second telescopic cylinder, a turning frame, a telescopic frame and a support rod. The supporting frame is fixed on the frame, the first telescopic cylinder is installed on the supporting frame and the piston rod of the first telescopic cylinder is vertically arranged, the upper end of the connecting arm is rotatably connected to the piston rod of the first telescopic cylinder, and the lower end of the connecting arm is rotatably connected to the turning frame, the second telescopic cylinder is installed on the turning frame and can be turned synchronously with the turning frame, the telescopic frame is installed on the piston rod of the second telescopic cylinder, the support rod is installed on the telescopic frame and is used to support the bag mouth of the blank, and the first telescopic cylinder can drive the telescopic frame to turn up to the bottom of the die or turn down through the connecting arm to avoid the blank shot from the die.

[0007] In order to enable the supporting device to fully open the bag opening of the blank, the supporting rod includes a first supporting rod and a second supporting rod installed on both sides of the telescopic frame. Under the drive of the second telescopic cylinder, the first supporting rod and the second supporting rod can approach or move away from each other.

[0008] In order to enable the flipping frame to flip smoothly, a vertical guide groove is provided on the support frame, and the piston rod head of the first telescopic cylinder is installed with a connecting shaft which can move up and down in the vertical guide groove, and the upper end of the connecting arm is rotatably connected to the connecting shaft, and, when the upper end of the connecting arm moves downward to the lowest position, the connecting arm and the piston rod of the second telescopic cylinder are both inclined relative to the vertical plane, and the inclination directions are opposite, and when the upper end of the connecting arm moves upward to the highest position, the telescopic frame flips up to the bottom of the die and the piston rod of the second telescopic cylinder is in a horizontal position.

[0009] The closing device can have a variety of structures. Preferably, the closing device includes a fixed bracket, a first closing arm, a second closing arm, a first double-headed telescopic cylinder and a second double-headed telescopic cylinder. The first closing arm and the second closing arm are both roughly U-shaped. The two side rods of the first closing arm and the two side rods of the second closing arm are respectively arranged on both sides of the lower part of the mouth die, and the bottom rod of the first closing arm and the bottom rod of the second closing arm are arranged below the mouth die. The first double-headed telescopic cylinder and the second double-headed telescopic cylinder are respectively located on both sides of the lower part of the mouth die, and the piston rod of the first double-headed telescopic cylinder is horizontally arranged and respectively connected to the upper parts of the first closing arm and the second closing arm, and the piston rod of the second double-headed telescopic cylinder is horizontally arranged and respectively connected to the upper parts of the first closing arm and the second closing arm, and the middle parts of the two side arms of the first closing arm and the two side arms of the second closing arm are rotatably connected to the fixed bracket.

[0010] The material picking device can have a variety of structures. Preferably, the material picking device includes a material clamping fixed frame, a first material clamping telescopic cylinder, a second material clamping telescopic cylinder, a first material clamping arm, a second material clamping arm and a translation drive mechanism. The first material clamping telescopic cylinder and the second material clamping telescopic cylinder are both horizontally installed on the material clamping fixed frame, the first material clamping arm is installed on the piston rod of the first material clamping telescopic cylinder, and the second material clamping arm is installed on the telescopic rod of the second material clamping telescopic cylinder. The first material clamping arm and the second material clamping arm are arranged in parallel and can be matched with or separated from each other under the drive of the first material clamping telescopic cylinder and the second material clamping telescopic cylinder. The translation drive mechanism can drive the first material clamping telescopic cylinder, the second material clamping telescopic cylinder, the first material clamping arm and the second material clamping arm to move inward as a whole to the upper opening of the mold clamping device or move outward to the outside of the mold clamping device.

[0011] In order to prevent the material supporting device, the closing device and the piece taking device from interfering with each other during operation, the material supporting device and the piece taking device are respectively arranged on both sides of the closing device.

[0012] The technical solution adopted by the present invention to solve the second technical problem is: the automatic closing and taking-out method of the blow molding equipment is characterized by comprising the following steps:

[0013] ①. The turning frame of the supporting device is turned upward to below the die under the drive of the first telescopic cylinder, and the blank is ejected downward from the discharge port of the die. The second telescopic cylinder drives the first supporting rod and the second supporting rod to move away from each other to open the blank bag opening;

[0014] ②. Driven by the first double-head telescopic cylinder and the second double-head telescopic cylinder, the bottom rods of the first closing arm and the second closing arm of the closing device close together and close the mouth of the blank bag;

[0015] ③. The overturning frame is turned downward under the drive of the first telescopic cylinder. Under the drive of the first double-head telescopic cylinder and the second double-head telescopic cylinder, the bottom rods of the first closing arm and the second closing arm are opened outward to avoid the falling blank.

[0016] ④. The closed blank is ejected downward, and after it descends to the set position, the clamping device is relatively closed to form the blank into a blow molded part;

[0017] ⑤. Driven by the translation drive mechanism, the first clamping arm and the second clamping arm of the pick-up device move to the top of the mold clamping device, and the first clamping arm and the second clamping arm are driven by the first clamping telescopic cylinder and the second clamping telescopic cylinder to move closer to each other and clamp the top of the blow-molded part;

[0018] ⑥. Driven by the translation drive mechanism, the clamped blow molded part is moved out of the mold clamping device;

[0019] ⑦. When the blow-molded part moves to the unloading position, the first clamping telescopic cylinder and the second clamping telescopic cylinder drive the first clamping arm and the second clamping arm to open, and the blow-molded part falls.

[0020] Compared with the prior art, the advantages of the present invention are that when the blow molding equipment is working, the injection, support, closing, mold closing and material taking operations can be automatically completed in sequence through the mutual cooperation of the mold closing device, the material supporting device, the closing device and the picking device. The degree of automation is high, which greatly improves the work efficiency. In particular, the closing operation is completed automatically, avoiding manual closing, which not only improves the closing quality, but also greatly improves the operating safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of an embodiment of the present invention before the blank is shot down;

[0023] Figure 3 for Figure 2 A schematic diagram of the structure from another angle;

[0024] Figure 4 It is a schematic structural diagram of the supporting device of an embodiment of the present invention in a non-supporting state;

[0025] Figure 5 for Figure 4 A schematic diagram of the structure from another angle;

[0026] Figure 6 It is a schematic diagram of the structure of the embodiment of the present invention when the blank is ejected;

[0027] Figure 7 It is a schematic diagram of the structure of the embodiment of the present invention when the blank is in a closed state;

[0028] Figure 8 It is a schematic structural diagram of the material supporting device in the material supporting state according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below with reference to the accompanying drawings.

[0030] like Figures 1 to 8As shown, the blow molding equipment of this embodiment includes a frame 1, a die 2, a feed channel 3, a clamping device 4, a supporting device 5, a closing device 6 and a taking device 7. Among them, the die 2 is installed on the top of the frame 1, the feed port of the die 2 is connected to the feed channel 3, the clamping device 4 is installed below the discharge port of the die 2, the supporting device 5 is used to support the bag opening of the blank ejected from the die 2, the closing device 6 is used to close the bag opening of the blank, the clamping device 4 is used to mold the blank into a blow molded part, and the taking device 7 is used to take the blow molded part from the clamping device 4. In addition, in order to avoid mutual interference during operation, as shown in FIG. Figure 2 As shown, the material supporting device 5 and the piece taking device 7 are respectively arranged on both sides of the closing device 6 .

[0031] The supporting device 5 of this embodiment includes a supporting frame 51, a first telescopic cylinder 52, a connecting arm 53, a second telescopic cylinder 54, a turning frame 55, a telescopic frame 56, a first supporting rod 57, a second supporting rod 58 and a connecting shaft 59. Among them, the support frame 51 is fixed on the frame 1, and a vertical guide groove 511 is provided on the support frame 51. The first telescopic cylinder 52 is installed on the support frame 51 and the piston rod of the first telescopic cylinder 52 is vertically arranged. The connecting shaft 59 is horizontally installed on the piston rod head of the first telescopic cylinder 52 and can move up and down along the vertical guide groove 511. The upper end of the connecting arm 53 is rotatably connected to the connecting shaft 59, and the lower end of the connecting arm 53 is rotatably connected to the flip frame 55. The second telescopic cylinder 54 is installed on the flip frame 55 and can flip synchronously with the flip frame 55. The telescopic frame 56 is installed on the piston rod of the second telescopic cylinder 54. The first strut 57 and the second strut 58 are installed at both ends of the telescopic frame 56. Under the drive of the second telescopic cylinder 54, the first strut 57 and the second strut 58 can be made to approach or move away from each other.

[0032] like Figure 4 and Figure 5 As shown, under the drive of the first telescopic cylinder 52, the connecting shaft 59 is driven to move downward. When the upper end of the connecting arm 53 moves downward to the lowest position, the turning frame 55 turns downward. The piston rods of the connecting arm 53 and the second telescopic cylinder 54 are both inclined relative to the vertical plane, and the inclination directions are opposite. At this time, as shown in FIG. Figure 1 , Figure 2 , Figure 3 and Figure 6 As shown, the telescopic frame 56 avoids the blank (not shown) ejected from the die 2.

[0033] like Figure 7 and Figure 8As shown, driven by the first telescopic cylinder 52, the connecting shaft 59 is driven to move upward, and when the upper end of the connecting arm 53 moves upward to the highest position, the turning frame 55 turns upward to a horizontal position, and the telescopic frame 56 turns upward to the bottom of the die 2 and the piston rod of the second telescopic cylinder 54 is in a horizontal position. At this time, driven by the second telescopic cylinder 54, the first support rod 57 and the second support rod 58 are separated from each other, so that the mouth of the blank bag ejected from the die 2 can be fully opened.

[0034] The mouth-closing device 6 of this embodiment includes a fixed bracket 61, a first mouth-closing arm 62, a second mouth-closing arm 63, a first double-headed telescopic cylinder 64, and a second double-headed telescopic cylinder 65. The first mouth-closing arm 62 and the second mouth-closing arm 63 are both generally U-shaped, the two side rods of the first mouth-closing arm 62 and the two side rods of the second mouth-closing arm 63 are respectively arranged on the two sides of the lower part of the mouth die 2, the bottom rod of the first mouth-closing arm 62 and the bottom rod of the second mouth-closing arm 63 are arranged below the mouth die 2, the first double-headed telescopic cylinder 64 and the second double-headed telescopic cylinder 65 are respectively located on the two sides of the lower part of the mouth die 2, the piston rod of the first double-headed telescopic cylinder 64 is horizontally arranged and connected to the upper part of the first mouth-closing arm 62 and the second mouth-closing arm 63, the piston rod of the second double-headed telescopic cylinder 65 is horizontally arranged and connected to the upper part of the first mouth-closing arm 62 and the second mouth-closing arm 63, and the middle parts of the two side arms of the first mouth-closing arm 62 and the two side arms of the second mouth-closing arm 63 are both rotatably connected to the fixed bracket 61.

[0035] like Figure 7 As shown, under the drive of the first double-head telescopic cylinder 64 and the second double-head telescopic cylinder 65, the first closing arm 62 and the second closing arm 63 are closed together and are in a closing state, that is, the first closing arm 62 and the second closing arm 63 clamp the opening of the blank bag (not shown in the figure) ejected from the die 2 to perform the closing operation. Figure 6 As shown, under the drive of the first double-head telescopic cylinder 64 and the second double-head telescopic cylinder 65 , the first closing arm 62 and the second closing arm 63 open to each other to avoid the blank ejected from the die 2 .

[0036] The picking device 7 of this embodiment includes a clamping fixed frame 71, a first clamping telescopic cylinder 72, a second clamping telescopic cylinder 73, a first clamping arm 74, a second clamping arm 75 and a translation drive mechanism 76. Among them, the first clamping telescopic cylinder 72 and the second clamping telescopic cylinder 73 are both horizontally mounted on the clamping fixed frame 71, the first clamping arm 74 is mounted on the piston rod of the first clamping telescopic cylinder 72, and the second clamping arm 75 is mounted on the telescopic rod of the second clamping telescopic cylinder 73. The first clamping arm 74 and the second clamping arm 75 are arranged in parallel and can be matched or separated from each other under the drive of the first clamping telescopic cylinder 72 and the second clamping telescopic cylinder 73. The translation drive mechanism 76 can drive the first clamping telescopic cylinder 72, the second clamping telescopic cylinder 73, the first clamping arm 74 and the second clamping arm 75 to move inward as a whole to the top of the mold clamping device 4 or outward to the outside of the mold clamping device 4. The translation drive mechanism 76 can adopt various translation mechanisms in the prior art, such as Figure 3 As shown, the translation driving mechanism 76 of this embodiment adopts a transmission method of a driving motor 761, a sprocket 762 and a chain 763, and the specific structure will not be described in detail.

[0037] The automatic closing and taking-out method of the blow molding equipment of this embodiment comprises the following steps:

[0038] ①. The turning frame 55 of the supporting device 5 is turned upward to the bottom of the die 2 under the drive of the first telescopic cylinder 52, and the blank is ejected downward from the discharge port of the die 2. The second telescopic cylinder 54 drives the first supporting rod 57 and the second supporting rod 58 to move away from each other to open the blank bag opening;

[0039] ②, driven by the first double-head telescopic cylinder 64 and the second double-head telescopic cylinder 65, the bottom rods of the first closing arm 62 and the second closing arm 63 of the closing device 6 close together and close the mouth of the blank bag;

[0040] ③. The turning frame 55 is turned downward under the drive of the first telescopic cylinder 52, and the bottom rods of the first closing arm 62 and the second closing arm 63 are opened outward under the drive of the first double-headed telescopic cylinder 64 and the second double-headed telescopic cylinder 65 to avoid the falling blank;

[0041] ④. The closed blank is ejected downward, and after it descends to the set position, the mold clamping device 4 is relatively closed to form the blank into a blow molded part;

[0042] ⑤. Driven by the translation drive mechanism 76, the first clamping arm 74 and the second clamping arm 75 of the pick-up device 7 move to the top of the mold clamping device 4. Driven by the first clamping telescopic cylinder 72 and the second clamping telescopic cylinder 73, the first clamping arm 74 and the second clamping arm 75 move closer to each other and clamp the top of the blow-molded part.

[0043] ⑥. Driven by the translation drive mechanism 76, the clamped blow molded part is moved out of the mold clamping device 4;

[0044] ⑦. When the blow-molded part moves to the unloading position, the first clamping telescopic cylinder 72 and the second clamping telescopic cylinder 73 drive the first clamping arm 74 and the second clamping arm 75 to open, and the blow-molded part falls.

Claims

1. A blow molding device, comprising a frame (1), a die (2) mounted on the top of the frame (1), a feed port of the die (2) being connected to a feed channel (3), and a clamping device (4) being mounted below a discharge port of the die (2), characterized in that: The device also comprises a supporting device (5), a closing device (6) and a taking device (7); the supporting device (5) can rotate to the bottom of the die (2) and support the bag mouth of the blank ejected from the die (2); the closing device (6) is used to close the bag mouth of the blank; the clamping device (4) is used to mold the blank moved down into a blow molded part; the taking device (7) is used to clamp the top of the blow molded part and take away the blow molded part; the supporting device (5) and the taking device (7) are respectively arranged on both sides of the closing device (6); the supporting device (5) comprises a supporting frame (51), a first telescopic cylinder (52), a connecting arm (53), and a connecting arm (54). The invention relates to a machine frame (1) comprising a first telescopic frame (53), a second telescopic cylinder (54), a turning frame (55), a telescopic frame (56) and a support rod, wherein the support frame (51) is fixed on the frame (1), the first telescopic cylinder (52) is mounted on the support frame (51) and the piston rod of the first telescopic cylinder (52) is arranged vertically, the upper end of the connecting arm (53) is rotatably connected to the piston rod of the first telescopic cylinder (52), the lower end of the connecting arm (53) is rotatably connected to the turning frame (55), the second telescopic cylinder (54) is mounted on the turning frame (55) and can be turned synchronously with the turning frame (55), and the telescopic frame (56) is mounted on the second telescopic cylinder (54). The support rod is mounted on the piston rod of the cylinder (54), the support rod is mounted on the telescopic frame (56) and is used to open the mouth of the blank bag, and the first telescopic cylinder (52) can drive the telescopic frame (56) to turn up to the bottom of the die (2) or turn down to avoid the blank shot from the die (2) through the connecting arm (53), the support rod comprises a first support rod (57) and a second support rod (58) mounted on both sides of the telescopic frame (56), under the drive of the second telescopic cylinder (54), the first support rod (57) and the second support rod (58) can approach each other or move away from each other, and the support frame (51) is provided with a vertical guide groove (511), The piston rod head of the first telescopic cylinder (52) is provided with a connecting shaft (59) which can move up and down in the vertical guide groove (511); the upper end of the connecting arm (53) is rotatably connected to the connecting shaft (59); and, when the upper end of the connecting arm (53) moves downward to the lowest position, the connecting arm (53) and the piston rod of the second telescopic cylinder (54) are both inclined relative to the vertical plane, and the inclination directions are opposite; and, when the upper end of the connecting arm (53) moves upward to the highest position, the telescopic frame (56) is flipped up to the bottom of the die (2) and the piston rod of the second telescopic cylinder (54) is in a horizontal position.

2. The blow molding device according to claim 1, characterized in that: The closing device (6) comprises a fixed bracket (61), a first closing arm (62), a second closing arm (63), a first double-head telescopic cylinder (64) and a second double-head telescopic cylinder (65); the first closing arm (62) and the second closing arm (63) are both substantially U-shaped; two side rods of the first closing arm (62) and two side rods of the second closing arm (63) are respectively arranged on two sides of the lower part of the mouth die (2); a bottom rod of the first closing arm (62) and a bottom rod of the second closing arm (63) are arranged below the mouth die (2); the first double-head telescopic cylinder (64) and the second double-head telescopic cylinder (65) are respectively arranged on two sides of the lower part of the mouth die (2); The cylinder (64) and the second double-headed telescopic cylinder (65) are respectively located on both sides of the lower part of the die (2); the piston rod of the first double-headed telescopic cylinder (64) is horizontally arranged and respectively connected to the upper parts of the first closing arm (62) and the second closing arm (63); the piston rod of the second double-headed telescopic cylinder (65) is horizontally arranged and respectively connected to the upper parts of the first closing arm (62) and the second closing arm (63); the middle parts of the two side arms of the first closing arm (62) and the two side arms of the second closing arm (63) are both rotatably connected to the fixed bracket (61).

3. The blow molding device according to claim 2, characterized in that: The picking device (7) comprises a material clamping fixed frame (71), a first material clamping telescopic cylinder (72), a second material clamping telescopic cylinder (73), a first material clamping arm (74), a second material clamping arm (75) and a translation drive mechanism (76), wherein the first material clamping telescopic cylinder (72) and the second material clamping telescopic cylinder (73) are both horizontally mounted on the material clamping fixed frame (71), the first material clamping arm (74) is mounted on the piston rod of the first material clamping telescopic cylinder (72), and the second material clamping arm (75) is mounted on the piston rod of the second material clamping On the telescopic rod of the telescopic cylinder (73), the first clamping arm (74) and the second clamping arm (75) are arranged in parallel and can be aligned with or separated from each other under the drive of the first clamping telescopic cylinder (72) and the second clamping telescopic cylinder (73); the translation drive mechanism (76) can drive the first clamping telescopic cylinder (72), the second clamping telescopic cylinder (73), the first clamping arm (74) and the second clamping arm (75) to move inward as a whole to the upper opening of the mold clamping device (4) or move outward to the outside of the mold clamping device (4).

4. The automatic closing and removing method of blow molding equipment according to claim 3 is characterized in that The steps include: ①, the turning frame (55) of the supporting device (5) is turned upward to the bottom of the die (2) under the drive of the first telescopic cylinder (52), and the blank is ejected downward from the discharge port of the die (2), and the second telescopic cylinder (54) drives the first supporting rod (57) and the second supporting rod (58) to move away from each other, so as to open the blank bag opening; ②, under the drive of the first double-headed telescopic cylinder (64) and the second double-headed telescopic cylinder (65), the bottom rods of the first closing arm (62) and the second closing arm (63) of the closing device (6) are closed together to close the mouth of the blank bag; ③. The turning frame (55) is turned downward under the drive of the first telescopic cylinder (52), and the bottom rods of the first closing arm (62) and the second closing arm (63) are opened outward under the drive of the first double-headed telescopic cylinder (64) and the second double-headed telescopic cylinder (65) to avoid the falling blank; ④. The closed blank is ejected downwards, and after it descends to a set position, the mold clamping device (4) is relatively closed to form the blank into a blow-molded part; ⑤. Driven by the translation drive mechanism (76), the first clamping arm (74) and the second clamping arm (75) of the pick-up device (7) move to the top of the mold clamping device (4), and the first clamping arm (74) and the second clamping arm (75) are driven by the first clamping telescopic cylinder (72) and the second clamping telescopic cylinder (73) to move closer to each other and clamp the top of the blow-molded part; ⑥. Driven by the translation drive mechanism (76), the clamped blow-molded part is moved out of the mold clamping device (4); ⑦. When the blow-molded part moves to the unloading position, the first clamping telescopic cylinder (72) and the second clamping telescopic cylinder (73) drive the first clamping arm (74) and the second clamping arm (75) to open, and the blow-molded part falls.

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