JP2006043949A - Manufacturing method of upper and lower part housing bodies in two-split type wiring protective cylinder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem wherein a bellows part is compressed or stretched to be deformed in a wiring protective cylinder for permitting the insertion of wiring or piping between a main body and a moving body to protect the wiring or piping. <P>SOLUTION: The one unit members 25 and 25a of the upper and lower part housing bodies 8 and 11 in the two-split type wiring protective cylinder 1 are constituted of a bellows member 26 constituting bellows parts 3 and 3a and hinge attaching members 27 and 27a which constitute a part of the hinge attaching parts 4 and 4a positioned at both front and rear ends of the bellows member 26 and holding rod bodies 58 and 58a, which are removed after the one unit members 25 and 25a are injection-molded to be solidified and stabilized, are integrally molded between the hinge attaching members 27 and 27a in the non-contact state with the bellows member 26 to hold the interval between the hinge attaching members 27 and 27a by the holding rod bodies 58 and 58a. Accordingly, the deformation of the bellows member 26 can be prevented. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

In various apparatuses provided with a movable body movable on a main body frame, the present invention inserts wiring and piping for supplying and transmitting fluid such as electric power, signal, air and oil between the main body and the movable body. The present invention relates to a method for manufacturing an upper and lower container in a wiring protection cylinder that protects a wiring and is divided into upper and lower parts.

Conventionally, a protective cylinder is obtained by inserting wiring, etc. for supplying and transmitting power, signals, etc. between the main body and the moving body into the protective cylinder, and by attaching a mounting bracket to the end of the protective cylinder and attaching it to the main body and the moving body It is attached in a U-shape with an arc-shaped bent portion in the middle, and the bent portion is moved by the movement of the moving body so that the protective cylinder travels.

As the protective cylinder, the storage space has a substantially rectangular shape and can be bent in at least one direction, and a corrugated tube having a bellows shape or a unit member connection type has been proposed.
The bellows-like corrugated tube is not easy to insert the wiring into the storage space, and
Since terminals and connectors are attached to both ends of the plurality of wires, it is difficult to insert the plurality of wires at the same time, or it is impossible to insert them depending on the size.
On the other hand, in the unit member connection type protective cylinder, the member configuration and the connection configuration are complicated.

Therefore, the applicant of the present application is that the upper and lower storage bodies 2 have a substantially rectangular frame on the front and have a storage space inside.
The upper and lower parts of the upper and lower storage bodies are formed integrally with a bellows part that can be bent in the longitudinal direction and a hinge mounting part that cannot be bent alternately, and the hinge body is engaged with and disengaged from the connecting part provided on the side surface of the hinge mounting part. Developed a protective cylinder with a simple configuration with only the upper and lower housings and the hinge body provided freely. According to the protective cylinder,
An insertion opening is provided in the direction of the peripheral axis of the protective cylinder by opening and closing the hinge body on one side of the protective cylinder and the upper storage body so that wiring or the like can be inserted.

As a method for molding such a long object, when the single body constituting the long object is continuously formed and molded, the rear end portion which is the melted part of the single molded object is melted. By molding the next single unit while melting by the residual heat, and integrally forming the continuous portion between the single units by thermal fusion,
There is a method for increasing the strength of the connecting portion (see, for example, Patent Document 1).

Japanese Examined Patent Publication No. 59-23550 (Claims, Fig. 4)

However, in the above molding method, after moving the previously molded unit, the next unit is molded. There has been a problem to be solved, such as the weak bellows being compressed or stretched.

In view of the problem that the weak bellows portion is compressed or stretched during movement after molding based on the above-described conventional technology, the present invention provides a unit member for the upper and lower part storage bodies in the two-part wiring protection cylinder as a bellows portion. A holding rod body comprising a bellows member and a hinge attachment member constituting a part of a hinge attachment portion located at both front and rear ends of the bellows member, the one unit member being injection-molded and removed after solidification stabilization Are formed in a non-contact manner with the bellows member and integrally between the hinge mounting members, so that the holding rod body holds the space between the hinge mounting members to prevent deformation of the bellows member. Resolve.

In short, the present invention is a method for manufacturing an upper and lower housing in a two-part wiring protection cylinder in which a thin and flexible bellows portion and a thick and non-bendable hinge mounting portion are alternately and continuously formed. One unit member of the upper and lower housings is constituted by a bellows member constituting the bellows part and hinge attachment members constituting a part of the hinge attachment part located at both front and rear ends of the bellows member, and the one unit member The holding rod that is removed after solidification is stabilized without contact with the bellows member,
Since it is formed integrally between the hinge mounting members, molding shrinkage differs depending on molding conditions such as temperature, gate arrangement, and wall thickness. Especially, the thinner the wall thickness, the larger the shrinkage due to the flow direction of the resin material. Because the difference is large, the bellows part is easily affected by molding shrinkage, but in the present invention there is a holding rod body, so after molding, the retaining rod body remains for several days due to shape change due to molding shrinkage, and the change over time is completed Since it may be removed at the time, it is possible to prevent dimensional change and shrinkage of the bellows member due to changes over time, stabilize the size, shape and crystal of the bellows part and prevent deformation due to molding shrinkage.

Since the molding die is provided with a spool that opens in the cavity of one hinge mounting member and a runner that connects the cavity of the hinge mounting member, the raw resin injected from the spool enters the cavity of the other hinge mounting member into a narrow bellows Can be injected through the runner without passing through the cavity of the part, so that the injection time of the raw material resin into the entire cavity of one unit member can be shortened, and thus the entire cavity of one unit member can be reliably It is possible to spread the raw material resin.
Further, since the solidifying member of the remaining raw material in the runner is formed with the holding rod body, it can be handled without forming the cavity for the holding rod body in the molding die.

In the molding die, an arrangement cavity at the end of one unit member molded and solidified is continuously formed in the cavity provided with the spool, and a new one unit member is injected to connect to the end of the one unit member molded and solidified. Since it was made to be molded, the raw material resin in a high temperature state enters the rear end of the molded member, so that the molded member can be melted and integrated with the injected raw material resin. The upper and lower part storage bodies in the protective cylinder can be formed.
In addition, since the gate from the runner connecting both the hinge mounting members to the bellows cavity is provided in the molding die, the raw material resin is injected from the hinge mounting member cavity and the runner into the bellows cavity. Since the raw material resin can be injected into the bellows part cavity not only from the cavity of the mounting member but also from the runner, the injection time of the raw material resin into the entire cavity of one unit member can be further shortened. The practical effect is significant, such as the fact that the raw material resin can be more reliably distributed throughout the cavity of the unit member.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing the arrangement / running state of a wiring protection cylinder attached to the main body and the moving body, FIG. 2 is a partial plan view of the wiring protection, and FIG.

The wiring protection cylinder of the present invention is used in various apparatuses having a moving body provided in the apparatus main body, for example, various industrial apparatuses such as machine tools, conveying apparatuses, manufacturing apparatuses, and in particular, an IC set installed in a clean room having a dust problem. It is used for various devices such as insertion devices and manufacturing devices, or used for vehicles having sliding doors.
As an example of mounting to the main body and the moving body, as shown in FIG. 1, mounting brackets (not shown) are attached to both ends of the protective cylinder and connected to the main body and the moving body. U at the arc-shaped bend
It is attached in the shape of a letter, and is attached so that the arc-shaped bent part moves and travels as the moving body moves.

As shown in FIGS. 2 and 3, the synthetic resin wiring protection cylinder 1 is an upper and lower divided body having a substantially rectangular frame shape with a storage space 2 inside, and bellows 3, 3 a. The hinge mounting parts 4, 4 a... That cannot be bent are integrally formed, and the upper and lower divided bodies are assembled by the hinge bodies 5, 5 a, which can be engaged and disengaged on both sides of the hinge mounting parts 4, 4 a. ing.
The substantially rectangular upper and lower divided parts are a concave lower storage body 8 in which the side plates 7 and 7a are integrally formed by bending upward from both ends of the bottom plate 6, and the side plates 10 and 10a by bending downward from both ends of the top plate 9. It is composed of an integrally formed reverse concave upper storage body 11, and the upper and lower side plates 7, 7 a, 10, 10 a are in a butted state when assembled.

The bellows portions 3, 3 a... In the upper and lower housings 8, 11 that are formed into a substantially rectangular frame when assembled are thin and substantially wavy, while the hinge mounting portions 4, 4 a are thick. The hinge bodies 5, 5a are detachably attached to the connecting portions 12 provided on both side surfaces, and the bellows portions 3, 3a,. It can be bent little by little to form an arcuate bend.

The connecting portions 12 provided on the hinge mounting portions 4, 4a,... Have two gaps 13 at the front and rear with a gap 13 in the longitudinal direction, and the connecting projections 14, 14a, etc. are provided outside the side plates 7, 7a, 10, 10a. Each connecting projection is provided
14, 14 a... Are provided with fitting recesses 15, 15 a... Of the hinge bodies 5, 5 a... And engaging projections 16, 16 a. Joint recesses 17, 17a,... Are provided respectively.
In addition, the riffs 18, 18a,... In the width direction at the front and rear ends of the hinge mounting portions 4, 4a, and the connecting projections 14, 14a,.
And a gate solidified portion 19 in which a resin raw material flow path at the time of injection molding is solidified on the surface side at an intermediate portion between the pair of engaging concave portions 17, 17a.

The hinge bodies 5, 5 a... Are pivotally attached to the other side connection at the one side opening when the upper and lower divided bodies are assembled and joined.
It has a configuration having a lock function in a vertically joined state.
A pair of upper and lower fitting rods that can compete in the fitting recesses 15, 15a of the pair of upper and lower connecting projections 14, 14a.
20 and 20a are connected by connecting side plates 21 and 21a to integrally form unit hinge members 22 and 22a, and a pair of unit hinge members 22 and 22a are integrated by a central connecting member 23 to form hinge bodies 5, 5a. Forming.
The fitting bars 20, 20a in the hinge bodies 5, 5a ... have a circular cross section, and the fitting bars 20
The fitting recesses 15, 15a, which can be fitted freely, have an inner diameter that is the same as that of the fitting rods 20, 20a, and have an opening that is narrower on the outside than the diameter of the fitting rods 20, 20a ... In the C shape, the projecting arc portion on the opening side is elastically deformed when the fitting rods 20, 20a.
Further, the connecting member 23 and the inner connecting side plates 21 and 21a in the hinge bodies 5 and 5a are placed in the gap 13 between the pair of connecting protrusions 14 and 14a.

The material resin can be made of various materials such as polypropylene resin, polyamide resin, and vinyl chloride resin, and is preferably highly durable due to repeated bending of the bellows portions 3, 3a, etc. Because of the slight sliding contact and separation between the 8 and 11 butting surfaces, one of the upper and lower housings 8 and 11 has excellent surface smoothness, low wear, or a lubricating film on the surface. May be provided.

In the wiring protection cylinder 1, a plurality of one unit members 25, 25a... Are connected and integrated, and each of the one unit members 25, 25a. The bellows member 26 and the hinge mounting member 27 constituting a part of the hinge mounting portions 4, 4 a, located at both ends of the bellows member 26.
27a, guide members 28, 28a are integrally formed on both side portions of the hinge mounting members 27, 27a, and guide holes 29, 29a are horizontally penetrated through the guide members 28, 28a.
In addition, the phase stepped portion 30 is provided on the back surface of the rear end of the hinge mounting member 27 on the rear end side, and the hinge mounting member 27 on the front end side is provided.
A phase missing step 30a corresponding to the phase missing step 30 is formed at the front end of a, and the phase missing steps 30, 30 are formed.
A unit member 25, 25a... is connected and melted and integrated to form the wiring protection cylinder 1 by a.

In the mold for forming the upper and lower housings 8 and 11 in the wiring protection cylinder 1 by connecting and integrating the one unit members 25 and 25a to the front one unit members 25 and 25a. The movable frame 32 and the take-out frame 33 between the fixed frame 31 and the movable frame 32 are configured.

In the fixed frame 31 and the movable frame 32, the concave mold 36 and the convex mold 37 are installed on the opposing surfaces of the mold plates 34 and 35, and one unit in the upper and lower housings 8 and 11 is provided between the concave mold 36 and the concave mold 37. Forming a cavity 38 of the members 25, 25a... Which is a cavity 38a forming a hinge mounting member 27, 27a
, 38b and a cavity 38c forming the bellows member 26, and a spool 31a opened at the cavity 38b forming the hinge mounting member 27a on the front end side is formed in the concave mold 36, and the raw material is injected into the cavity 38. I try to do it.
Further, the concave mold 36 and the convex mold 37 can be clamped at substantially the center of the extraction frame 33, and a pair of guide shafts 40, 40a are horizontally disposed on the extraction frame 33, and the cavity 38 on the opposing surface of the concave mold 36 and the convex mold 37 The receiving grooves 43, 43a, 44, 44a of the guide shafts 40, 40a are formed on the upper and lower portions of the forming portions 41, 42, respectively.
A pusher 45 that pushes out a molded product when the mold is opened is disposed outside the one side portion of the take-out frame 33, and the other side portion is formed so that one unit member 25, 25a.
, 40a protrudes from the other side.
Further, the guide shafts 40, 40a pass through the cavities 38a, 38b of the hinge mounting members 27, 27a, which are also cavities of the guide members 28, 28a, at the time of mold clamping, so that the guide holes 29, 28a have a guide hole 29. 29a are formed.
In addition, the outer side of the guide shafts 40, 40a has a fitting recess 15, 15a.
The protrusions 47 and 47a for forming the shape are integrally formed.

Grooves 48, 48a are formed at the bottoms of the receiving grooves 44, 44a of the convex mold 37 in the movable frame 32, and the grooves 48, 48a
And guide shafts 40, 40a, hinge mounting members 27, 27 in one unit member 25, 25a.
Runners 49 and 49a communicating between the cavities 38a and 38b forming a are formed.
Cavity 38c forming each bellows member 28 in each unit member 25, 25a ... and each runner 49, 49
a communicate with each other by gates 50, 50a, and the gates 50, 50a are cold slugs 51,
The runners 49 and 49a communicate with each other via 51a.
Each of the cold slugs 51, 51 a... Is provided inside the grooves 48, 48 a.
48a is formed by the concavity formed so as to be hung on the opposite surface of the concave mold 36, and the concave portion is a groove 48,
48a forming deeper.
The gates 50, 50a,... Are formed by grooves formed on the opposing surface of the concave mold 36 and the opposing surface of the convex mold 37.

In the molding portion 54 of the bellows member 28 in the concave mold 36, the bellows member 28 and the hinge mounting members 27, 27 in the concave die 37 are recessed in the portions protruding from both side portions where the housing grooves 43, 43a are formed.
In the molding part 55, 56, 56a of a, the convex part is continuously provided in the part depressed from both side parts where the receiving grooves 44, 44a are formed, and the gates 50, 50a. In addition to being formed so as to open at the molding part 54 and the projecting side surface, the cold slugs 51, 51a,...
In addition, a molding portion 57 of the phase stepped portion 30 of the rear hinge mounting member 27 is formed in the molding portion 56a of the rear hinge mounting member 27a.

Therefore, as shown in FIGS. 10 and 11, the molded product by the above-mentioned mold has the holding rods 58, 58a in which the raw resin remaining in the runners 49, 49a is solidified between the guide members 30, 30a, the gate 50, 50a…
And the members 59, 59a... In which the raw material resin remaining in the 51, 51a... Are cold slugs are formed between the holding rods 58, 58a and the bellows member 28, respectively.

Next, the manufacturing process of the upper and lower storage bodies 8 and 11 in the protective cylinder will be described.
(1) The fixed frame 31 and the movable frame 32 so that the rear end of the molded member is positioned at the front of the cavity 38b.
And the extraction frame 33 is clamped.
(2) After the mold clamping, when the raw material resin is injected from the spool 31a into the cavity 38c, the cavity 38b is filled, and then the raw material resin is directly filled into the cavity 38b and the runners 49, 49
a, because of the cold slug 51, 51a ... and the gate 50, 50a ..., the cavity 38c is filled with the raw resin, and the cavity 38a is filled with the raw resin via the runners 49, 49a, and the cavity After filling 38c, the raw resin is filled directly into the cavity 38a.
(3) When a predetermined amount of time has elapsed after the injection of the raw material resin is completed, the movable frame 32 and the extraction frame 33 are first separated from the concave mold 36 of the fixed frame 31, and the movable frame 32 is further stopped after the extraction frame 33 stops. Is moving and convex
Release from 37.
(4) After the molded member is moved to the downstream side by a predetermined stroke by the pusher 45 of the take-out frame 33, the steps (1) to (3) are repeated until the molded member has a predetermined length.
(5) After the completion, in the next step, the holding bar bodies 58, 58a and the raw material resin solidified members 59, 59a.

(2) In the process, when the raw material resin is injected from the spool 31a into the cavity 38c, the raw material resin in a high temperature state enters the phase-less step portion 30 at the rear end portion of the molded member, and the phase step portion 30a is formed, and the low temperature phase phase difference step portion 30a is melted by the high temperature phase phase step portion 30a, and the hinge mounting members 27, 27a are integrated to form the hinge mounting portions 4, 4a. Yes.
The bellows member 28 becomes the bellows portions 3, 3a, and the guide members 30, 30a are connected to the connecting projections 14, 14a.
..., so that the guide holes 29, 29a become fitting recesses 15, 15a.

(4) Since the holding rods 58, 58a still exist at the time of the process, even if the molded member is pushed out by the pusher 45, the bellows member 28 which is easily deformed at a high temperature is not compressed and deformed.

In the upper and lower housings 8 and 11 that do not require the guide protrusions 14 and 14a, that is, the guide members 30 and 30a, in the step (5), the holding rods 58 and 58a and the raw material resin solidifying members 59 and 59a are used. ... and the guide members 30, 30a are also removed.

It is the schematic which shows the use condition of the wiring protection cylinder which concerns on this invention. It is a partial top view of a wiring protection cylinder. It is AA sectional drawing of FIG. It is a top view at the time of the mold clamping of the shaping die of the upper-and-lower part storage body in a wiring protection cylinder. FIG. 5 is a horizontal sectional view of FIG. 4. It is BB sectional drawing of FIG. It is CC sectional drawing of FIG. It is DD sectional drawing of FIG. It is a top view which shows the shaping | molding process by the shaping die of FIG. It is a partial top view of the upper-lower storage body immediately after shaping | molding. It is EE sectional drawing of FIG.

Explanation of symbols

1 Wiring protection cylinder 3, 3a ... Bellows part 4, 4a ... Hinge mounting part 8 Upper housing
11 Lower housing
25, 25a… One unit member
26 Bellows member
27, 27a Hinge mounting member
31a spool
38a, 38b, 38c cavity
49, 49a Lanna
50, 50a… Gate
58, 58a Holding rod

Claims (4)

A method of manufacturing an upper and lower housing in a two-part wiring protection cylinder in which a thin and flexible bellows portion and a thick and non-bendable hinge mounting portion are alternately and continuously formed,
One unit member of the upper and lower part storage body is constituted by a bellows member that constitutes a bellows part, and a hinge attachment member that constitutes a part of the hinge attachment part located at both front and rear ends of the bellows member,
The one-unit member is injection-molded, and the holding rod body that is removed after solidification is formed in a non-contact manner with the bellows member and integrally formed between the hinge mounting members. Manufacturing method of upper and lower portion storage body in cylinder. A runner that connects the cavities of the hinge mounting member and a spool that opens in the cavity of one hinge mounting member are provided in the molding die, and the solidified member of the remaining raw material in the runner is formed as a holding rod. The manufacturing method of the upper-and-lower part storage body in the 2-part dividing type | formula wiring protection cylinder of Claim 1. In the molding die, an arrangement cavity at the end of one unit member molded and solidified is continuously formed in the cavity provided with the spool, and a new one unit member is injected to connect to the end of the one unit member molded and solidified. 3. The method for manufacturing an upper and lower portion storage body in a two-divided wiring protection cylinder according to claim 1, wherein the upper and lower case storage bodies are molded. 4. A gate from the runner for connecting both hinge mounting members to the bellows cavity is provided in the molding die, and the raw material is injected from the cavity of the hinge mounting member and the runner to the bellows cavity. The manufacturing method of the upper-and-lower-parts storage body in the 2 division | segmentation-type wiring protection cylinder of description.

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