JP3741399B2 - Air blower for hollow molding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air blowing device for a hollow molding machine, and in particular, by using a variable height stopper for a nut stand hook contact, a counter ring whose cut ring is a mold even in repeated driving of an air blowing nozzle. The present invention relates to a novel improvement for preventing depression and preventing a gap between the cut ring and the counter plate.
[0002]
[Prior art]
As the air blowing device of this type of hollow molding machine that has been used conventionally, the configurations disclosed in Japanese Patent No. 2599864 and Japanese Patent Laid-Open No. 8-281787 are given as shown in FIGS. Can do.
That is, what is indicated by reference numeral 1 in FIG. 4 and FIG. 5 is a fixed portion composed of a pair of plates 1 a and a lower plate 1 b fixed to the base 20, and a plurality of the fixed portions 1 are provided. A plurality of guide bars 22 are provided on the guide cylinder 21 so as to be movable up and down, and a movable plate 24 having a blowing nozzle holder 23 is integrally attached to the lower end of the guide bar 22.
An air blowing nozzle 5 is provided at a lower portion of the blowing nozzle holder 23, and a mold 6 including a pair of mold parts 6a and 6b is disposed below the air blowing nozzle 5, Air is blown into the parison 7 located in the mold 6 through the air blowing nozzle 5.
A nut 26 having a stopper 25 in a state of passing through the hole 1bA of the lower plate 1b is integrally provided on the movable plate 24 via a nut stand 26a and a lock nut 26A. The diameter is larger than that of the hole 1bA.
[0003]
An electric motor 30 is provided on the plate 1a. A rotary screw 29 made of a ball screw or the like is integrally connected to a rotary shaft 27 of the electric motor 30 through a thrust bearing 28. The nut 26 is threaded through. Accordingly, the movable plate 24 moves up and down along the arrow A through the nut 26 by the rotation of the rotary screw 29.
The conventional air blowing device of the hollow molding machine is configured as described above, and its operation will be described below. First, the mold 6 is opened, a cylindrical parison 7 extruded from a molding machine (not shown) is positioned in the cavity 6A of the mold 6, and the motor 30 is closed with the mold 6 closed. Is operated, the air blowing nozzle 5 hangs down through the nut 26 and the movable plate 24 by the rotation of the rotary screw 29, and the tip 5a is inserted into the upper end of the parison 7 to complete the driving.
In the above-described state, compressed air is supplied into the parison 7 from an air source (not shown), and hollow molding is performed in the mold 6. After the hollow molding is performed, when the mold 6 is opened, a molded product by the hollow molding can be taken out.
The speed of insertion (injection) of the air blowing nozzle 5 by the motor 30 is preliminarily taken in optimal data depending on the shape of the molded product, the type of resin, etc., and is stored in a memory (not shown) of the control unit 40. Since the rotation of the motor 30 is freely stored and controlled according to the data from the memory and the speed is freely adjusted, the operator does not need to rely on the feeling as in the prior art, and the switch Optimal insertion can be performed only by operation. Further, the lowering position of the air blowing nozzle 5 can be easily set by the contact between the stopper 25 and the lower plate 1b.
[0004]
In addition, the structure using the nozzle adjustment apparatus is proposed for the above-mentioned blowing nozzle holder 23 as disclosed by above-mentioned Unexamined-Japanese-Patent No. 8-281787.
That is, the nozzle adjusting device 23 is configured as shown in FIG. 6. The nozzle adjusting device 23 includes upper and lower tapered plates 50 and 51 whose mating surfaces are inclined surfaces, and a lower portion of the lower tapered plate 51. And a block 54 for attaching the upper and lower taper plates 50 and 51 and the nozzle nut 52 to the lower plate 1b via a spring 53 as an elastic member to be described later. An air blowing nozzle 5 is screwed into a lower portion of the nut 52 and is fixed by a nozzle lock nut 55.
A hole 57 for an upper adjustment bolt 56 for sliding the upper taper plate 50 in the horizontal direction is provided on the upper side of the block 54, and a lower part for sliding the nozzle nut 52 in the horizontal direction on the lower side. A long hole 59 for the adjustment bolt 58 is provided. The lower taper plate 51 is provided on the block 54 so as to be slidable in the vertical direction. Further, a gap S is provided between the block 54 and the nozzle nut 52 in order to slide the upper taper plate 50 in the horizontal direction and the lower taper plate 51 in the vertical direction by the upper adjustment bolt 56. It has been. The gap S is provided with a plurality of springs 53 as elastic members so that the nut 52 is always in contact with the lower taper plate 51 and the upper taper plate 50 slides with as little force as possible. Further, the mating surfaces of both the taper plates 50 and 51 are subjected to a surface treatment such as hard chrome plating so as to slide with as little force as possible.
[0005]
Next, operation | movement of the air blowing nozzle adjustment apparatus 23 mentioned above is demonstrated.
In order to align the core of the air blowing nozzle 5 with the core of the mouth portion of the mold 6 disposed at the lower position, the nozzle nut 52 is moved by the lower adjustment bolt 58 provided on the lower side of the block 54. Slide horizontally. Further, the height of the air blowing nozzle 5 is adjusted by sliding the upper taper plate 50 in the horizontal direction with an upper adjustment bolt 56 provided on the upper side of the block 54.
Accordingly, when the height of the air blowing nozzle 5 is adjusted by the nozzle adjusting device 23 and then the rotating screw 29 is rotated by the electric motor 30, the movable plate 24 and the blowing unit integrally connected to the nut 26 via the nut stand 26a. As the air nozzle 5 descends rapidly and the cut ring 60 contacts the counter plate 61 of the mold 6 as shown in FIG. 7, the upper burr 64 of the mouth 63 of the molded product 62 is cut.
[0006]
[Problems to be solved by the invention]
Since the conventional air blowing device of the hollow molding machine is configured as described above, the following problems exist. That is,
As described above, when the air blowing nozzle is repeatedly driven into the molded product, the stopper 25 and the lock nut 26A are loosened, and a gap is generated between the cut ring 60 and the counter plate 61. Cutting was poor and had a significant effect on the yield of molded products. Therefore, as shown in FIG. 8, when such a situation occurs, the lock nut 26A of the stopper 25 is rotated by the hook spanner 70 to adjust the height, but the guide tube 21 becomes an obstacle. Therefore, the hook spanner 70 is difficult to rotate, and the operation is extremely difficult.
[0007]
The present invention has been made to solve the above-described problems, and in particular, by making the stopper with which the nut of the nut stand comes into contact with a variable height type, the cut ring can be used even when the air blowing nozzle is repetitively driven. An object of the present invention is to provide an air blowing device for a hollow molding machine in which a counter plate of a mold is not pushed down and a gap is not generated between a cut ring and a counter plate.
[0008]
[Means for Solving the Problems]
An air blowing apparatus for a hollow molding machine according to the present invention supplies air through an air blowing nozzle into a parison held in a mold, and performs air blowing of the hollow molding machine configured to perform hollow molding of the parison. In the apparatus, an electric motor having a rotating screw provided on an upper portion of the fixed portion located above the mold, a guide bar which is provided on the fixed portion and can be moved in and out, and the air blowing nozzle connected to each of the guide bars. A movable plate connected thereto, a lower plate provided at a lower portion of the fixed portion and having a hole; a nut provided on a nut stand provided on the movable plate; and a screw screwed with the rotating screw; and provided on the lower plate. And a pair of tapered sliders that constitute the height-variable stopper and slide relative to each other, rotate a rotating screw via the electric motor, and air via a nut. When lowering the inlet nozzle, the height of the nut stand is stored in contact with the height-variable stopper, and the height of the air blowing nozzle with respect to the mold is variably regulated. Further, one of the taper type sliders is fixed to the lower plate, and has a push bolt for sliding any one of the taper type sliders. The display unit displays a total height, and is further provided between a pair of longitudinal guide blocks provided on the lower plate, and the guide block and the variable height stopper. An elastic body, and the height-variable stopper is constantly urged toward the lower plate by the elastic body.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of an air blowing device for a hollow molding machine according to the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected and demonstrated to a part the same as that of a prior art example, or an equivalent part.
That is, what is denoted by reference numeral 1 in FIG. 1 is a fixed portion composed of a pair of plates 1 a and a lower plate 1 b fixedly provided on the base 20, and a plurality of guide cylinders 21 provided on the fixed portion 1. The guide bar 22 is provided with a plurality of guide bars 22 so as to be freely movable in the vertical direction. At the lower end of the guide bar 22, as in the conventional description of FIG. A movable plate 24 having 23 is attached integrally.
An air blowing nozzle 5 is provided at a lower portion of the blowing nozzle holder 23, and a mold 6 including a pair of mold parts 6a and 6b is disposed below the air blowing nozzle 5, Air is blown into the parison 7 located in the mold 6 through the air blowing nozzle 5. In addition, this nozzle adjustment apparatus 23 adjusts the core, the position, etc. of the air blowing nozzle 5 as previously described, and may not be used.
[0010]
At the upper part of the movable plate 24, a nut 26 is integrally provided through a nut stand 26a in a state of passing through the hole 1bA of the lower plate 1b. The nut 26 is connected to the nut stand 26a by a fixing bolt 200. It is provided integrally. An electric motor 30 controlled by the control unit 40 is provided on the plate 1a, and a rotating screw 29 made of a ball screw or the like is integrally connected to a rotating shaft 27 of the electric motor 30 via a thrust bearing 28. At the same time, the rotating screw 29 is threaded through the nut 26. Accordingly, the movable plate 24 moves up and down along the arrow A through the nut 26 by the rotation of the rotary screw 29. Between the nut 26 and the lower plate 1b, there is provided a variable height stopper 70 which is fixed on the lower plate 1b and whose total height L is variable.
Further, the cut ring 60 of the air blowing nozzle 5 provided at the lower part of the nozzle adjusting device 23 is configured to come into contact with the counter plate 61 of the mold 6 composed of a pair of mold parts 6a and 6b. In the parison 7 clamped in the mold 6, air from an air drive source (not shown) is supplied through the air blowing nozzle 5 so that hollow molding can be performed.
[0011]
The height-variable stopper 70 is configured as shown in FIGS. 2 and 3, and a pair of first and second tapered sliders 80 and 81 are slidable relative to each other on the lower plate 1b. Is provided. The second taper type slider 81 is provided so as to slide directly on the lower plate 1b, and the push bolts 83 and the pull bolts 84 provided on the first support piece 82 indicate arrows B and C. The second taper type slider 81 is provided on the first taper type slider 81, and is provided at an end 80 a of the second taper type slider 80. The tightening bolt 86 is held in the U groove 85a of the second support piece 85 planted on the lower plate 1b so as to be movable up and down. A flange 26b of a nut stand 26a accommodating the nut 26 is in contact with the upper surface of the second taper type slider 80, and each slider 80, 81 is formed in a U shape as seen in the plan view of FIG. A hole 90 is formed in the central portion so as to pass through the nut stand 26a and communicate with the hole 1bA. On each side of the upper surface of the first taper type slider 80, a pair of long guide blocks 100, 101 having an inverted L-shaped cross section are disposed and fixed on the lower plate 1b by mounting bolts 102. An elastic body 103 made of a spring, a spring, or the like is inserted between the guide blocks 100, 101 and the first taper type slider 80, and a gap or the like is generated between the sliders 80, 81 on the lower plate 1b side. It is always energized so that there is no. The nozzle adjusting device 23 may not be used. Further, the push bolt 83 that can be fixed by the lock nut 300 is provided with a known display portion 83a such as a dial type indicating the overall height L.
[0012]
The air blowing device of the hollow molding machine according to the present invention is configured as described above, and the operation thereof will be described below. First, the positions of the sliders 80 and 81 of the variable height stopper 70 are adjusted so that the cut ring 60 and the counter plate 61 of the air blowing nozzle 5 are in a contact state suitable for cutting the upper burr 64. After adjusting the overall height L as described above, the mold 6 is opened, and a cylindrical parison 7 extruded from a molding machine (not shown) is positioned in the cavity 6A of the mold 6 so that the air blowing nozzle 5 When the electric motor 30 is operated after moving the mold 6 in a state where the mold 6 is closed, the air blowing nozzle 5 is moved through the nut 26 and the movable plate 24 by the rotation of the rotary screw 29. Dripping is completed by inserting the tip 5a into the upper end of the parison 7. At the same time, the upper burr 64 is cut by the cut ring 60 and the counter plate 61 as in the conventional FIG.
In the above-described state, compressed air is supplied into the parison 7 from an air source (not shown), and hollow molding is performed in the mold 6. After the hollow molding is performed, when the mold 6 is opened, a molded product by the hollow molding can be taken out.
The speed of insertion (injection) of the air blowing nozzle 5 by the motor 30 is preliminarily taken in optimal data depending on the shape of the molded product, the type of resin, etc., and is stored in a memory (not shown) of the control unit 40. Since the rotation of the motor 30 is freely stored and controlled according to the data from the memory and the speed is freely adjusted, the operator does not need to rely on the feeling as in the prior art, and the switch Optimal insertion can be performed only by operation.
If the cutting state of the upper burr 64 by the cut ring 60 and the counter plate 61 deteriorates in the operation of driving the air blowing nozzle 5 described above, the push bolt 83 or the pull bolt without stopping the operation of the molding machine. By sliding the second taper type slider 81 by 84, the overall height L is changed and can be freely adjusted. In this embodiment, the case where the first taper type slider 80 is configured not to slide but only to move up and down and the second taper type slider 81 is configured to slide is described. In this case, the same effects as described above can be obtained.
[0013]
【The invention's effect】
Since the air blowing device of the hollow molding machine according to the present invention is configured as described above, the following effects can be obtained. In other words, the stopper provided on the lower plate of the fixed part is composed of a variable height type stopper that can freely change its overall height, and the contact position relationship between the cut ring and the counter plate at the time of driving can be freely set. Can be changed, reliable positioning of the lowering point of the air blowing nozzle, good burr cutting, no whiskers, improved life of the counter plate and cut ring, shortening the adjustment work time, regardless of operator skill level An effect such as workability can be achieved.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an air blowing device of a hollow molding machine according to the present invention.
FIG. 2 is an enlarged detail view showing a main part of FIG. 1;
FIG. 3 is a plan view of FIG. 2;
FIG. 4 is a configuration diagram showing a conventional air blowing device.
FIG. 5 is a side view of FIG. 4;
6 is an enlarged cross-sectional view showing a main part of FIG. 4;
FIG. 7 is a cross-sectional view showing a state where the upper burr is cut.
FIG. 8 is a configuration diagram showing a state during conventional adjustment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fixed part 1bA Hole 1b Lower plate 5 Air blowing nozzle 6 Mold 7 Parison 22 Guide bar 24 Movable plate 26 Nut 26b 鍔 26a Nut stand 29 Rotating screw 30 Electric motor 70 Height-variable type stopper 80, 81 Taper type slider 83 Push bolt 83a Display part L Total height 100, 101 Guide block 103 Elastic body

Claims (3)

Air blow of a hollow molding machine configured to supply air to the parison (7) held in the mold (6) via the air blow nozzle (5) and perform the hollow molding of the parison (7). In the apparatus, an electric motor (30) having a rotating screw (29) provided on an upper part of the fixing part (1) located above the mold (6), and a guide that is provided on the fixing part (1) and is freely accessible. A bar (22), a movable plate (24) connected to each of the guide bars (22) to which the air blowing nozzle (5) is connected, and a hole (1bA) provided at a lower portion of the fixed portion (1). A lower plate (1b) having a nut, a nut stand (26a) provided on the movable plate (24), a nut (26) screwed with the rotating screw (29), and the lower plate (1b) The height-variable stopper (70) provided and a pair of taper-type sliders (80, 81) that constitute the height-variable stopper (70) and slide relative to each other, and the electric motor (30 ) The rotating screw (29) When rotating and lowering the air blowing nozzle (5) through the nut (26), the flange (26b) of the nut stand (26a) in which the nut (26) is housed in the variable height stopper (70) Are in contact with each other to variably regulate the height position of the air blowing nozzle (5) with respect to the mold (6). One of the respective taper type sliders (80, 81) is fixed to the lower plate (1b), and a push bolt (83) for sliding any one of the respective taper type sliders (80, 81) is provided. 2. The air for a hollow molding machine according to claim 1, wherein the push bolt (83) has a display portion (83a) for displaying the total height (L) of the variable height stopper (70). Blowing device. A pair of elongated guide blocks (100, 101) provided on the lower plate (1b), and an elastic body (between the guide blocks (100, 101) and the height-variable stopper (70)) 103), and the height-variable stopper (70) is constantly urged toward the lower plate (1b) by the elastic body (103). Air blower for molding machines.

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