JP6041680B2 - Parison conveyor - Google Patents

Description

  The present invention relates to a parison transport device that is attached to a blow molding device and transports a parison extruded from an extrusion head to a blow molding die.

  Conventionally, in the production of a hollow body, for example, in the production of an automotive fuel tank made of a thermoplastic synthetic resin, a blow molding method has been often used because of the ease of molding the hollow body. In the blow molding method, a parison of a molten thermoplastic synthetic resin member is formed into a cylindrical shape, extruded from an extrusion head, the parison is sandwiched between blow molding dies, and air is blown into the parison to manufacture a fuel tank for an automobile. .

  As shown in FIGS. 7 and 8, in the blow molding method, the parison 102 is extruded from the extrusion head 101, the blow molding die 141 is opened, and the parison 102 is allowed to flow down therebetween. At that time, in order to shorten the molding cycle of blow molding and increase productivity, two blow molding dies 141 are used (for example, refer to Patent Document 1).

  That is, two blow molding dies 141 are respectively attached to the blow molding unit 140, and the blow molding unit 140 is rotated on the base 143 by the driving device 142. As a result, the two blow molding dies 141 are sequentially moved under the extrusion head 101 to cause the parison 102 to flow down between the blow molding dies 141, and then the blow molding die 141 is closed to perform extrusion. Move from below the head 101.

Then, the next blow molding die 141 is moved below the extrusion head 101 to cause the parison 102 to flow down, and the blow molded product is taken out from the previous blow molding die 141. Repeat this.
In this case, a large amount of energy is required because the blow molding unit 140 to which the heavy blow molding die 141 is attached is rotated on the base 143 by the driving device 142.

Therefore, as shown in FIGS. 9 to 11, the two blow molding dies 241 are respectively fixed, and the parison 202 extruded from the extrusion head 201 is conveyed to each blow molding 241 by the parison conveying device 210. (For example, refer to Patent Document 2).
The parison transport device 210 has a parison holding member 220 attached to a robot arm 213, a parison suction member 230 attached to the tip of the parison holding member 220, the parison 202 being sandwiched, and transported to each blow molding die 241. It is.

  As shown in FIG. 10, the parison adsorption member 230 includes three parison adsorption plates 231 attached to the main arm 222, and a plurality of parison adsorption pads 234 are attached to the parison adsorption plates 231. The parison suction plate 231 can be rotated by the cylinder 223 so as to surround the parison 202. The parison 202 is adsorbed and held by the parison adsorption pad 234.

  At this time, as shown in FIG. 11, the parison 202 is sandwiched by a total of six parison adsorption plates 231 respectively attached to the two main arms 222. In this case, the parison 202 extruded from the extrusion head 201 has a cylindrical shape, but the six parison adsorption plates 231 are hexagonal and sandwich the parison 202, so the parison adsorption plate 231 and the parison adsorption plate 231 The deformation of the parison 202 was inevitable at the corner between the two.

  The parison adsorbing plate 231 has a flat abutting surface with the parison 202, and the parison 202 is obliquely abutted with the parison 2202 among the parison adsorbing pads 234 attached to the six parison adsorbing plates 231. Some of them are difficult to adsorb, and the parison 202 may not be stably held.

JP 2004-52926 A Japanese Patent No. 4551982

  Therefore, the present invention has an object to provide a parison transport device that can reliably hold the parison and transport it to the blow molding die without impairing the shape of the parison in the parison transport device of the blow molding device. And

The present invention of claim 1 for solving the above-mentioned problem is a parison transport device that is attached to a blow molding device and transports a parison extruded from an extrusion head to a blow molding die.
The parison transport device has a parison holding member that holds the parison and a robot arm that moves the parison holding member attached to the tip.
The parison holding member includes a main frame that is attached to the robot arm, two main arms that are attached to the main frame, and are slidable on the main frame so as to be close to and away from each other. And a parison adsorbing member attached to each tip of the
The parison adsorbing member is composed of a parison adsorbing plate divided into three in the longitudinal direction, and the central parison adsorbing plate is attached to the front end of the main arm, and the front end side of the main arm is connected to the central parison adsorbing plate. The parison suction plate on the base side is pivotally attached with a suction member mounting pin,
When the parison adsorbing member attached to each tip of the main arm adsorbs the parison, the surface that grips the parison of the two parison adsorbing members forms an overall elliptical surface so as to wrap the parison,
A parison transport device in which a plurality of parison adsorption pads for adsorbing a parison are attached to a surface of each parison adsorption plate that holds the parison.

  According to the first aspect of the present invention, in the parison transport device that is attached to the blow molding device and transports the parison extruded from the extrusion head to the blow mold, the parison transport device includes a parison holding member that holds the parison, and a parison. It has a robot arm that attaches and moves the holding member to the tip. For this reason, the parison holding member can be moved freely even in a narrow place by the robot arm, and the degree of freedom of the installation place of the blow molding die and the extrusion head is great. Further, since the degree of freedom is large, the distance and height difference between the extrusion head and the blow molding die can be reduced, and the parison can be transported stably.

  The parison holding member includes a main frame that is attached to the robot arm, two main arms that are attached to the main frame, and are slidable on the main frame so as to be close to and away from each other. And a parison adsorbing member attached to each tip. For this reason, the two main arms attached to the main frame can be operated, and the parison can be clamped or separated by the parison adsorbing members attached to the respective ends of the main arms.

  The parison adsorbing member is composed of a parison adsorbing plate divided into three in the longitudinal direction, and the central parison adsorbing plate is attached to the front end of the main arm, and the front end side of the main arm is connected to the central parison adsorbing plate. A parison suction plate on the base side is rotatably attached by a suction member mounting pin. For this reason, the parison suction plate divided into three in the longitudinal direction is rotated by the suction member mounting pin, and the mounting angle is changed to change the elliptical shape formed by the parison suction member. According to the size, the parison can be wrapped by a parison adsorption plate.

  When the parison adsorbing members attached to the respective ends of the main arms adsorb the parison, the surfaces of the two parison adsorbing members that hold the parison form an overall elliptical surface so as to wrap the parison. For this reason, there are no corners on the surface of the parison adsorbing member that holds the parison, the outer surface of the parison can be smoothly held between the oval surfaces, the deformation of the parison is small, and a large number of parison adsorption pads do not leak, The parison can be adsorbed and stably held.

  A plurality of parison adsorption pads for adsorbing the parison were attached to the surface of each parison adsorption plate that holds the parison. For this reason, the outer surface of a parison can be hold | maintained uniformly with many parison adsorption | suction pads, and a deformation | transformation of a parison can be decreased.

  According to the present invention of claim 2, a sub arm is attached in parallel to each main arm, and the sub arm is reciprocated by a sub arm air check attached to each main arm and a valve plate attached to the robot arm. By the reciprocating motion, the parison suction plate on the front end side and the root side of the main arm attached to the central parison suction plate is a parison transport device that is rotated by the reciprocating motion of the sub arm.

  According to the present invention of claim 2, a sub arm is attached in parallel to each main arm, and the sub arm is reciprocated by a sub arm air check attached to each main arm and a valve plate attached to the robot arm. For this reason, the mounting position of the sub arm air check can be mounted near the base of the main arm, and the moment load on the main frame of the main arm can be reduced. Further, since the valve plate is attached to the robot arm, the load on the tip of the robot arm can be reduced, the operating energy of the robot arm can be reduced, and the operation can be performed smoothly.

  By the reciprocating motion of the sub-arm, the front-side and base-side parison-adsorbing plates attached to the central parison suction plate are rotated by the reciprocating motion of the sub arm. Therefore, the sub-arm can freely change the elliptical radius of the surface that holds the parison formed by the parison suction plate, and the surface that holds the parison formed by the parison suction plate according to the outer diameter of the parison. Can be optimized.

  According to a third aspect of the present invention, each surface of the parison adsorbing plate that holds the parison constitutes a part of the ellipsoidal surface when the parison adsorbing member forms an elliptical surface as a whole so as to wrap the parison. It is a parison conveyance device formed so as to be curved.

  In this invention of Claim 3, each surface which hold | maintains the parison of a parison adsorption | suction board comprises a part of elliptical surface, when an elliptical surface is formed as a whole so that a parison adsorption member may wrap a parison. It was formed to be curved. For this reason, the surface that grips the parison can form a smooth elliptical surface as a whole, there is little deformation of the parison, and a large number of parison adsorption pads uniformly adsorb the parison and stably hold the parison. be able to.

  The present invention of claim 4 is a parison transport device in which at least one of the parison suction pads attached to the parison suction plate on the front end side of the main arm is rotatably attached to the parison suction plate. .

  In the present invention of claim 4, at least one of the parison suction pads attached to the parison suction plate on the tip side of the main arm is attached so that the suction surface is rotatable with respect to the parison suction plate. For this reason, the parison suction pad that is rotatably attached to the outer surface of the parison can be in close contact with the elliptical outer surface of the parison, and the parison suction plate on the tip side can securely hold the parison. .

  According to the present invention of claim 5, the parison adsorption pad has an adsorption opening in the center, the circumference of the adsorption opening is surrounded by the adsorption opening outer wall, and the tip of the adsorption opening outer wall is formed in a protruding shape. Further, the suction opening outer wall tip is formed, and the outer surface of the suction opening outer wall is a parison transport device provided with a suction opening outer wall outer peripheral surface formed to be inclined from the suction opening outer wall tip.

  In the present invention of claim 5, the parison adsorption pad has an adsorption opening in the center, the circumference of the adsorption opening is surrounded by the adsorption opening outer wall, and the tip of the adsorption opening outer wall is formed in a protruding shape. The outer surface of the suction opening outer wall is formed, and the outer surface of the suction opening outer wall is provided with the outer surface of the suction opening outer wall formed so as to be inclined from the tip of the suction opening outer wall. For this reason, the parison is adsorbed at the suction opening when the parison is transported, and the area where the parison contacts the parison suction pad is small due to the front end of the suction opening outer wall and the outer peripheral surface of the suction opening outer wall. Can be reliably separated from the parison adsorption pad.

According to the sixth aspect of the present invention, there is provided a parison adsorption pad which is attached to a plurality of parison adsorption plates which are divided into three and which are attached to the surface of the parison adsorption plate. It is a parison transport device having a shut-off valve that shuts off only the pipe that sucks air from.

According to the present invention of claim 6, a plurality of parison adsorption pads attached to a surface of the parison adsorption plate divided into three and holding the parison, when any one of the parison adsorption pads has an air leak, It has a shut-off valve that shuts off only the pipe that sucks air from. For this reason, even if air leakage occurs in one parison adsorption pad, many other parison adsorption pads can be operated, and the parison can be stably held.

The present invention of claim 7 is a parison transport device in which the parison transport device is connected to the robot arm by a dummy bush for attaching a parison holding member .

In the present invention of claim 7, since the parison holding member is connected to the robot arm by the dummy bush for attaching the parison holding member , when the blow molded product to be molded is changed, when the parison holding member is replaced, Since it is only necessary to reconnect the parison holding member mounting dummy bush , the parison holding member can be easily exchanged, and the productivity can be improved.

When the parison adsorbing member attached to each end of the main arm adsorbs the parison, the surfaces of the two parison adsorbing members that hold the parison form an overall elliptical surface so as to wrap the parison. The surface of the adsorption member that holds the parison has no corners, the parison is less deformed, and a large number of parison adsorption pads do not leak, so that the parison can be adsorbed and stably held.
Since multiple parison adsorption pads that adsorb parison are attached to the surface of the parison adsorption plate that holds the parison, the outer surface of the parison can be uniformly held by a large number of parison adsorption pads, and deformation of the parison can be reduced. .

It is a side view of the parison conveyance device which is an embodiment of the invention. It is a top view of the parison holding member which is an embodiment of the invention. It is a front view of the parison holding member which is an embodiment of the invention. It is a top view of the parison adsorption member which is an embodiment of the invention. It is sectional drawing of the parison adsorption pad which is embodiment of this invention. It is a top view of the filter of the parison adsorption pad which is an embodiment of the invention. It is a side view of the conventional parison conveyance apparatus. It is a top view of the conventional parison conveyance apparatus. It is a side view of the other conventional parison conveyance apparatus. It is a perspective view of the other conventional parison holding member. It is a top view of the other conventional parison holding member.

The parison transport apparatus 10 which is embodiment of this invention is demonstrated based on FIGS.
As shown in FIG. 1, the parison transport device 10 includes a parison holding member 20 that holds the parison 2 and a robot arm 13 that moves the parison holding member 20 attached to the tip. The robot arm 13 is attached to the robot 15 and is driven by a predetermined program to convey the parison 2 to a blow molding die (not shown). The parison holding member 20 holds the parison 2 extruded from the extrusion head 1. The held parison 2 is cut in a hollow state between the extrusion head and the parison holding member 20.

For this reason, the parison holding member 20 can be freely moved even in a narrow place by the robot arm 13, and the degree of freedom of the installation place of the blow molding die and the extrusion head 1 is great.
In addition, the distance between the extrusion head 1 and the blow mold and the height difference are reduced, the vertical movement during parison transport and the change in inertia are reduced, and the parison 2 is prevented from being stretched and the parison 2 is prevented from falling. Can do.
The parison holding member 20 will be described later.

  An air hose 12 for sending air for driving a parison adsorbing member 30 to be described later is attached to the robot arm 13. The air hose 12 is supplied with air from the air tank 11 and is connected to a valve plate 14 attached to the robot arm 13. The air hose 12 is further extended from the valve plate 14 and reaches a sub-arm air check 25 attached to a main arm 22 of a parison holding member 20 described later. The parison adsorbing member 30 can be rotated by sending the air.

  Since the valve plate 14 is attached to the robot arm 13, the load on the tip of the robot arm 13 is made smaller than the attachment of the valve plate 14 to the parison holding member 20, and the operating energy of the robot arm 13 is reduced. The operation of the robot arm 13 can be made smooth.

  The parison holding member 20 is connected to the robot arm 13 by an ATC mounting dummy bush 27. In the ATC mounting dummy bush 27, the parison holding member 20 is attached to the tip of the robot arm 13, and a connecting member for supplying signals and energy for driving various members attached to the parison holding member 20 is integrally attached. ing. For this reason, when replacing the parison holding member 20 in order to form another blow molded product, it is only necessary to reconnect the portion of the ATC mounting dummy bush 27, and therefore the replacement of the parison holding member 20 is easy. Productivity can be improved.

Next, the parison holding member 20 is demonstrated based on FIG. 2 and FIG.
The parison holding member 20 is attached to the robot arm 13 by the ATC attachment dummy bush 27, and is slidably attached to the main frame 21, and is attached to be able to approach and separate from each other. Main arms 22, 22 and parison adsorbing members 30, 30 attached to the respective ends of the main arms 22, 22.

  The two main arms 22, 22 are attached to the main frame 21 at one end, and are slid on the main frame 21 by a main arm opening / closing servomotor 24 attached to the main frame 21 to be close to each other. And it is possible to leave. For this reason, the parison 2 can be clamped by the parison adsorption members 30 and 30 by operating the two main arms 22 and 22.

  On the two main arms 22, 22, sub-arm air checks 25, 25 are attached, respectively. An air hose 12 extending from the valve plate 14 is connected to the sub arm air checks 25, 25. The sub arms 23 and 23 are attached to the two main arms 22 and 22 along the longitudinal direction, respectively. One end of each of the sub-arms 23, 23 is connected to the sub-arm air check 25, 25, and the other end is connected to a parison adsorbing plate 31, 31 of a parison adsorbing member 30, 30 described later.

  The sub arms 23, 23 are reciprocated by the sub arm air checks 25, 25 and the valve plate 14 attached to the robot arm 13. For this reason, it is possible to reduce the moment load on the main frame 21 of the main arms 22, 22 by attaching the attachment positions of the sub-arm air checks 25, 25 near the base of the main arm 22 close to the main frame 21.

  Next, the parison adsorbing members 30 and 30 attached to the tips of the main arms 22 and 22 will be described with reference to FIGS. The two parison adsorbing members 30 and 30 are attached facing each other from the front ends of the main arms 22 and 22 and are symmetrical to each other, so that one parison adsorbing member 30 will be described.

  The parison adsorbing member 30 is composed of parison adsorbing plates 31, 31, 31 divided into three in the longitudinal direction. The central parison suction plate 31 is fixedly attached to the tip of the main arm 22. The parison suction plates 31 and 31 on the front end side and the base side of the main arm 22 are rotatably attached to the central parison suction plate 31 by suction member mounting pins 32 and 32.

  As described above, the tip of the sub arm 23 is attached to the parison suction plates 31 and 31 on the tip side and the base side of the main arm 22. For this reason, the parison suction plates 31 and 31 on the tip side and the base side of the main arm 22 of the parison suction plate 31 divided into three in the longitudinal direction are moved around the suction member mounting pins 32 and 32 by the reciprocating motion of the sub arm 23. The parison 2 can be wrapped by the parison suction plates 31, 31, 31 by rotating and rotating the mounting angle.

  Each surface that holds the parison 2 of the parison suction plate 31 is curved so as to form an elliptical surface as a whole. For this reason, when the three parison adsorbing plates 31, 31, 31 of the parison adsorbing member 30 hold the parison 2, the parison 2 formed by combining the left and right parison adsorbing members 30, 30 is held. The surface forms an elliptical surface as a whole so as to wrap the parison 2. The elliptical shape formed by the parison suction plate 31 can be changed according to the sliding length of the sub arm 23.

  The elliptical shape formed by the parison adsorbing members 30, 30 is such that when the parison 2 is extruded from the extrusion head 1 into a cylindrical shape, the elliptical short axis is about 10% shorter than the cylindrical diameter of the parison 2. The formed ellipse is preferred. Due to this elliptical surface, the parison 2 can be stably held without wrinkles.

  Therefore, the surface that holds the parison 2 formed by combining the left and right parison adsorbing members 30 and 30 is smooth and has no corners, and the outer surface of the parison 2 can be smoothly held by an elliptical surface. There is little deformation of Parison 2. In addition, a large number of parison adsorbing pads 34 to be described later can uniformly abut against and adsorb to the parison 2 to stably hold the upper portion of the parison 2.

  In the present embodiment, three parison adsorption pads 34 that adsorb the parison 2 are attached to the surface of the parison adsorption plate 31 that holds the parison 2. If there are a plurality of parison adsorption pads 34, the number thereof can be appropriately selected. For this reason, the outer surface of the parison 2 can be uniformly held by the large number of parison adsorption pads 34, 34, 34 attached to the three parison adsorption plates 31, and deformation of the parison 2 can be reduced.

  At least one of the parison suction pads 34 attached to the parison suction plate 31 on the front end side of the main arm 22 has a suction surface attached to the parison suction plate 31 so as to be rotatable. In the present embodiment, the parison suction pad 34 at the most distal end is rotatably attached. For this reason, when the parison 2 is held by the parison adsorption member 30, the parison adsorption pad 34 rotatably attached to the outer surface of the parison 2 can be brought into close contact with the parison 2 by changing the angle. The parison 2 existing at the 31st joint can be reliably held. Moreover, the parison adsorption pad 34 of the most root side and the other parison adsorption pad 34 can also be attached rotatably.

  As shown in FIG. 5, each parison adsorption pad 34 has an adsorption opening 38 at the center, and the adsorption opening 38 is surrounded by an adsorption opening outer wall 39. At the tip of the suction opening outer wall 39, a suction opening outer wall tip portion 39a formed in a protruding shape is formed. The outer surface of the suction opening outer wall 39 opposite to the suction opening 38 is formed with a suction opening outer wall outer peripheral surface 39b inclined from the suction opening outer wall tip 39a.

  For this reason, when the parison 2 is sucked by the suction opening 38 during conveyance of the parison, the parison 2 comes into contact with the suction opening outer wall front end portion 39a. However, since the suction opening outer wall tip 39a is pointed, the contact area is small. Furthermore, since the suction opening outer wall outer peripheral surface 39b is an inclined surface, the parison 2 in contact with the suction opening outer wall tip 39a is less likely to come into contact with the suction opening outer wall outer peripheral surface 39b and transports the parison 2. After that, the parison 2 can be reliably separated from the parison adsorption pad 34 when sandwiched between the blow molding dies.

  Each parison adsorption pad 34 has an adsorption opening 38 in the center, and a filter 35 is attached in the adsorption opening 38. The filter 35 has a number of filter holes 36 formed therein. An air suction hole 37 is formed in a portion of the parison suction pad 34 opposite to the suction opening 38, and the parison 2 can be sucked by the parison suction pad 34 by sucking air from the air suction hole 37. it can. The air suction hole 37 is connected to a vacuum pump (not shown) that sucks air with a pipe.

  Further, this pipe can be connected to a compressor to blow out air from the suction opening 38. In this case, the parison 2 can be reliably and quickly separated from the parison adsorption pad 34. Then, the filter hole 36 of the filter 35 can be prevented from being clogged, and the suction force can be maintained.

  A large number of parison adsorption pads 34 attached to the surface of the parison adsorption plate 31 that divides the parison adsorbing plate 31 to hold the parison 2 sucks air from the parison adsorption pad 34 when any of the parison adsorption pads 34 leaks air. When the vacuum pressure of the pipe is detected and the vacuum pressure drops, a shut-off valve (not shown) that shuts off the pipe is provided. For this reason, even if air leakage occurs in one parison adsorption pad 34, many other parison adsorption pads 34 can be operated, and the parison 2 can be stably held.

  This shutoff valve may be provided in a pipe in which two or three parison adsorption pads 34 are connected as a block. In this case, it is preferable that the parison adsorbing pads 34 connected by pipes are located at positions apart from each other. For example, a parison adsorption pad 34 attached to the central parison adsorption plate 31 is formed as one block of a parison adsorption pad 34 attached to the parison adsorption plate 31 on the front end side and a parison adsorption pad 34 attached to the parison adsorption plate 31 on the root side. 34 and the parison adsorbing pad 34 attached to the parison adsorbing plate 31 on the front end side or the base side are formed as one block.

2 Parison 10 Parison Transport Device 13 Robot Arm 20 Parison Holding Member 21 Main Frame 22 Main Arm 23 Sub Arm 27 ATC Mounting Dummy Bush 30 Parison Adsorption Member 31 Parison Adsorption Plate 34 Parison Adsorption Pad 38 Adsorption Opening

Claims (7)

In the parison transport device that is attached to the blow molding device and transports the parison extruded from the extrusion head to the blow molding die,
The parison transport device includes a parison holding member that holds the parison, and a robot arm that moves the parison holding member attached to the tip.
The parison holding member is attached to the robot arm, and the two main arms are attached to the main frame and are slidable on the main frame so as to be close to and away from each other. And a parison adsorbing member attached to each tip of the main arm,
The parison adsorbing member is composed of a parison adsorbing plate that is divided into three in the longitudinal direction. The central parison adsorbing plate is attached to the tip of the main arm, and the main parison adsorbing plate is attached to the main parison adsorbing plate. The above-mentioned parison suction plates on the tip side and the base side of the arm are rotatably attached by suction member mounting pins,
When the parison adsorbing member attached to the tip of each of the main arms adsorbs the parison, the surfaces of the two parison adsorbing members that hold the parison are oval surfaces as a whole so as to wrap the parison Form the
A parison transport device, wherein a plurality of parison adsorption pads for adsorbing the parison are attached to a surface of each of the parison adsorption plates for holding the parison.   A sub arm is attached in parallel to each main arm, and the sub arm is reciprocated by the air check for the sub arm attached to the main arm and the valve plate attached to the robot arm. 2. The parison transport device according to claim 1, wherein the parison adsorbing plate on the front end side and the root side of the main arm attached to the central parison adsorbing plate is rotated by the reciprocating motion of the sub arms.   Each surface of the parison suction plate that grips the parison is curved so as to form a part of the elliptical surface when the parison suction member forms an overall elliptical surface so as to wrap the parison. The parison conveyance device according to claim 1 or claim 2 formed as described above.   The at least one of the parison adsorbing pads attached to the parison adsorbing plate on the front end side of the main arm has an adsorbing surface rotatably attached to the parison adsorbing plate. The parison transport device according to claim 1.   The parison adsorption pad has an adsorption opening in the center, the adsorption opening is surrounded by an adsorption opening outer wall, and the tip of the adsorption opening outer wall is formed in a protruding shape at the adsorption opening outer wall 5. The suction opening outer wall outer peripheral surface formed so as to be inclined from the suction opening outer wall tip is provided on the outer surface of the suction opening outer wall. The parison transport device according to one item. A plurality of the parison adsorbing pads attached to the surface of the parison adsorbing plate divided into three and holding the parison, when one of the parison adsorbing pads leaks air, sucks air from the parison adsorbing pad. The parison transport device according to any one of claims 1 to 5, further comprising a shut-off valve that shuts off only a pipe to be turned on. The parison transport device according to any one of claims 1 to 6, wherein the parison holding member is connected to the robot arm by a dummy bush for attaching the parison holding member .

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