JPH0640574U - Extendable pipe for piping - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention has a large expansion and contraction rate and is not easily damaged. In addition, the expansion and contraction is smooth and quick, and the adjacent lateral expansion and contraction pipes are not damaged. An object of the present invention is to provide a pipe for expansion and contraction, which has little pressure loss and can improve the productivity of bottle making machines and the like. [Structure] The reference tube has stoppers attached to the inner surfaces of both ends thereof, and the first movable tube has a sealing on the outer peripheral surface of the tip end portion on the side to be inserted into the reference tube, and an outer peripheral surface on the opposite side and an inner peripheral surface on the tip end side thereof. A plurality of movable pipes having the same structure as the first movable pipe and having an outer diameter that is gradually reduced are sequentially inserted into the adjacent movable pipes, and the movable pipe with the smallest diameter is located at the tip of the insertion side. It is characterized in that a sealing and a screw are respectively provided on the outer peripheral surface and the outer peripheral surface of the tip portion on the opposite side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a stretchable pipe for pipes, and more particularly, to a stretchable pipe for use in connecting a plunger cylinder of a bottle making machine and two relatively moving parts.

[0002]

[Prior art]

 When manufacturing various bottles with different heights and diameters, the plunger (PL) cylinders that make up the bottle making machine are made of corrugated thin stainless welded pipe A flexible tube coated with a blade was used while being housed in multiple cases.

[0003]

[Problems to be solved by the device]

 Further, the plurality of flexible tubes housed in the case also move laterally due to fluctuations in the atmospheric pressure and strike against each other, which also causes damage. Moreover, in the conventional flexible tube, even if a crack occurs in the bent part of a thin stainless steel tube, the outer side of the flexible tube is covered with a stainless steel blade, which delays the discovery of cracks and identifies the crack location. Was difficult.

Further, since a thin tube made of stainless steel is covered with a blade on the outside, a large force is required to bend the tube. For this reason, a large force was required to move the PL cylinder in the vertical direction, which required time for adjustment and shortened the time for changing the mold of the bottle making machine. In addition, the flexible tube has a non-smooth inner surface, and the outer surface is covered by a stainless steel blade, which reduces the inner diameter for the same outer diameter, resulting in a large pressure loss of the fluid flowing inside. Therefore, the pressure required to operate the fluid had to be increased. If the inner diameter is increased, the outer diameter of the flexible tube becomes larger, resulting in higher cost, more labor to handle, and a larger case for accommodating the flexible tube.

The present invention has been made in view of these circumstances, and has a larger expansion and contraction rate than a conventional flexible tube, is less susceptible to damage, and is smoothly and swiftly moved during expansion and contraction. The purpose of the present invention is to provide an expandable pipe pipe that does not damage the expansion pipe, reduces the loss of fluid pressure during operation, and improves the productivity of bottle manufacturing machines. is there.

[0006]

[Means for Solving the Problems]

 The present invention has been made to achieve the above-mentioned object. The reference tube is provided with a ring-shaped stopper on the inner peripheral surface of the opening at both ends, and the first movable tube inserted into the reference tube is The outer peripheral surface of the tip end on the insertion side is fitted with a ceiling that contacts the inner peripheral surface of the reference tube, and the outer peripheral surface on the opposite side of the first movable tube and the inner peripheral surface on the distal end side contact the end surface of the reference tube. A plurality of movable stoppers, each of which has a contacting stopper and a stopper that contacts an outer protruding portion on the distal end side of the second movable tube to be inserted, has the same configuration as the first movable tube and whose outer diameter is gradually reduced. The pipes are sequentially inserted into the movable pipes whose inner diameters are slightly larger than those of the adjacent pipes, and the movable pipe with the smallest diameter farthest from the reference pipe is installed with the sealing on the outer peripheral surface of the tip end on the inserted side and the opposite. It is characterized in that the connecting means is provided at the tip of the side It is obtained by devising a stretchable plumbing pipes.

[0007]

[Action]

 When a tensile force is applied to both ends of a pipe for expansion and contraction that is connected to two members, the movable pipes with the smallest diameters at both ends in the length direction adjoin the sealing on the outer peripheral surface of the tip. 2 Sliding in contact with the inner peripheral surface of a small-diameter movable pipe, it is pulled out in the direction of the acting force. When the outer protruding portion of the drawn-out minimum-diameter movable pipe comes into contact with the stopper on the inner peripheral surface side of the second small-diameter movable pipe, the direction of the force exerted by the second small-diameter movable pipe together with the minimum-diameter movable pipe. Be slid on. In the same manner, movable pipes with a large diameter are sequentially drawn out, and the pipes for pipes are stretched.

On the other hand, when a force in the compression direction is applied to both ends of the pipe for piping in the stretched state, the movable pipe having the smallest diameter is first accommodated in the movable pipe having the second small diameter, and the movable pipe having the smallest diameter is stored. The storage is stopped in a state where the members connected to the movable pipe are in contact with both ends of the second small diameter. Next, when the second small diameter movable pipe is pressed toward the large diameter movable pipe by the member connected by the connecting means, the second small diameter movable pipe has a stopper on the outer peripheral surface side. It is housed in the adjacent movable pipe together with the movable pipe having the smallest diameter up to a position where it comes into contact with the end face of the adjacent movable pipe having a larger diameter. The storage is continued in the same manner thereafter, and finally each movable pipe is stored in the reference pipe in a superposed state, and the total length of the pipe for piping is the shortest length.

[0009]

【Example】

 Hereinafter, embodiments according to the present invention will be described with reference to the drawings. 1 to 4 show an embodiment of the present invention. An expandable pipe is a reference pipe 1 having the largest outer diameter, and a plurality of sets, for example, two sets, each having an outer diameter gradually decreasing. Mainly composed of the movable tubes 2 and 3.

The reference tube 1 has a circumferential groove 1a having a constant width formed on the inner peripheral surfaces of the openings at both ends thereof. The circumferential groove 1a is provided with a ring-shaped stopper 4 such as a C-shaped ring. It is elastically attached so that it can be detached so as to project inward from the inner peripheral surface. Reference numeral 1b is a ring-shaped protrusion formed on a portion of the outer peripheral surface corresponding to the circumferential groove 1a of the reference tube 1, and the protrusion 1b serves to reduce the thickness of the reference tube 1.

First movable tubes 2 and 2 each having an outer diameter slightly smaller than an inner diameter of the reference tube 1 are inserted into openings at both ends of the reference tube 1. Each of the first movable tubes 2 has a ring-shaped protruding portion 2a having a circumferential groove 2b formed on the outer peripheral surface of the tip end portion on the insertion side. A sealing member 5 that comes into contact with the inner peripheral surface of the reference tube 1 is attached to the circumferential groove 2b, and the airtightness between the reference tube 1 and the first movable tube 2 is maintained.

On the other hand, at the opposite end of the first movable tube 2, the circumferential groove 2d formed in the ring-shaped protrusion 2c protruding from the outer peripheral surface is in contact with the end surface of the reference tube 1 C. A ring-shaped stopper 6 such as a shape ring is detachably and elastically mounted. In the first movable tube 2, a stopper 7 having the same structure as the above is elastically mounted in a circumferential groove 2e formed on the inner peripheral surface on the tip side. The protrusion 2c to which the stopper 6 on the outer peripheral surface side is attached has a height on the tip side slightly lower than that on the reference tube 1 side, so that the outer stopper 6 can be easily attached and detached. Further, the stopper 7 on the inner peripheral surface side is attached, and the depth of the tip end side of the circumferential groove 2e is slightly shallower than that of the reference tube 1 side so that the thickness of the tip end side of the first movable tube 2 is reduced. The inner stopper 7 can be easily attached and detached without any need.

A second movable tube 3 having an outer diameter slightly smaller than the inner diameter of the first movable tube 2 is inserted at the tip end side of the first movable tube 2. The second movable tube 3 has a ring-shaped protrusion 3a formed on the outer peripheral surface of the distal end on the side inserted into the first movable tube 2, which can come into contact with the stopper 7 on the inner peripheral surface side of the first movable tube 2. Has been done. In the circumferential groove 3b provided in the projecting portion 3a, a sealing 8 that is in contact with the inner peripheral surface of the first movable tube 2 is mounted. Further, a screw 3c as a coupling means is engraved on the outer peripheral surface at the tip end on the opposite side of the second movable pipe 3, and both ends of the expandable pipe are screwed to the screw 3c. It is connected to two members that move relative to each other or change the distance via the connecting members 9, 9. The connecting means may be a screw, a flange, a bayonet, a coupler, or the like.

In the above embodiment, one first movable tube 2 is extendably connected between the reference tube 1 and the second movable tube 3 which is the minimum diameter movable tube in which the screw 3c is engraved. Although the case has been described, a plurality of movable tubes having the same structure as the first movable tube 2 and having a gradually decreasing outer diameter may be inserted between the reference tube 1 and the movable tube having the smallest diameter. In this case, if the number of movable tubes to be inserted is increased, not only the extendable distance but also the expansion / contraction rate can be increased.

In the case of the configuration of this embodiment, when a force in the pressing direction acts on both ends of the pipe for piping in the stretched state (see FIG. 1), the second movable pipes 3 having the smallest diameters are respectively moved to the first movable pipes. The portion of the sealing 8 that abuts on the inner peripheral surface of 2 slides and is housed in the first movable tube 2 to be in the state shown in FIG. In this state, the connecting member 9 connected to the second movable tube 3 is in contact with the end surface of the first movable tube 2, so that when a force in the pressing direction is further applied, the first movable tube 2 will move to the reference position. Sliding occurs at the portion of the sealing 5 that abuts the inner peripheral surface of the tube 1, and is moved into the reference tube 1 together with the second movable tube 3. This movement is stopped when the stopper 6 on the outer side of the first movable tube 2 comes into contact with the end surface of the reference tube 1, and the contracted state shown in FIG.

Further, when a force in the pulling direction acts on both ends of the pipe for piping in the contracted state (see FIG. 3), the second movable pipe 3 comes into contact with the inner peripheral surface of the first movable pipe 2 and the sealing 8 4 causes a slip, and is pulled out from the inside of the first movable tube 2 to be in the state shown in FIG. In this state, since the end surface of the ring-shaped protruding portion 3a of the second movable tube 3 is in contact with the stopper 7 inside the first movable tube 2, when a force in the pulling direction further acts, the first movable tube 2 Slides at the portion of the sealing 5 that abuts the inner peripheral surface of the reference tube 1, and is pulled out from the reference tube 1 together with the second movable tube 3. This withdrawal is stopped when the end surface of the insertion-side protruding portion 2a of the first movable tube 2 contacts the stopper 4 of the reference tube 1, and the extended state shown in FIG. 1 is obtained.

In the pipe for piping having this configuration, the expansion and contraction of the pipe is performed by sliding between the reference pipe 1 and the first movable pipe 2 and between the first movable pipe 2 and the second movable pipe 3, so The expansion and contraction rate can be increased as compared with the case of the flexible tube, and the stress applied to the reference tube 1 and each of the movable tubes 2 and 3 can be reduced so that damage is less likely to occur. Also, since the surface of the pipe for piping is not covered by the blade like the flexible tube, the outer diameter of the pipe can be made smaller than the inner diameter, and when the pipe is damaged, Not only can air leaks due to breakage be detected early, but the location of breakage can be easily identified.

Further, since the expansion and contraction direction is determined in the length direction of the reference tube 1 and bending stress does not act, durability is improved and the tube moves laterally even when the pressure of air or the like flowing in the tube fluctuates. Instead, the adjacent pipes can be prevented from hitting each other so that they do not damage each other. In addition, the inner surface of the pipe for piping is smoother than that of the conventional flexible tube, the pressure loss of the air flowing inside is small, and the expansion and contraction is performed smoothly and quickly by sliding, so It is possible to improve the productivity of bottle making machines to which pipes for manufacturing are attached.

[0019]

[Effect of device]

 According to the present invention, stoppers are attached to the inner surfaces of the openings at both ends of the reference tube, and a plurality of movable tubes having smaller outer diameters are inserted into the reference tube. Each movable tube has a sealing on the outer peripheral surface on the insertion side. When mounted, stoppers are provided on the outer peripheral surface of the tip on the opposite side and the inner peripheral surface on the tip side of the tip, and the movable tube with the smallest diameter has the sealing on the tip of the insertion side and the outer circumference of the tip on the opposite side. Since the surface is provided with screws, the piping pipe has a larger expansion and contraction rate than conventional flexible tubes, making it less susceptible to damage and reducing the outer diameter, allowing early detection of air leakage when damage occurs. Therefore, it becomes easy to identify the damaged part. Further, since the expansion and contraction is performed in one direction and is not subjected to bending stress, the durability is good and it is possible to prevent the pipes from hitting each other due to pressure fluctuations such as air. In addition, since the inner surface of the pipe for piping is smooth and the expansion and contraction of the pipe can be performed smoothly and quickly, it is possible to improve the productivity of the bottle making machine to which the pipe is connected.

[Brief description of drawings]

FIG. 1 is a cross-sectional side view in an expanded state showing an embodiment of the present invention.

FIG. 2 is a sectional side view showing an intermediate state from a stretched state to a contracted state.

FIG. 3 is a sectional side view showing a contracted state of the present invention.

FIG. 4 is a sectional side view showing an intermediate state from a contracted state to an extended state.

[Explanation of symbols]

 1 Reference pipe 2 1st movable pipe 2a (outside) protrusion 3 2nd movable pipe 3a (outside) protrusion 3c Screw 4,6,7 Stopper 5,8 Sealing

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaru Nakaiso Yamamura Glass Co., Ltd. 2-21 Hamamatsubaracho, Nishinomiya City, Hyogo Prefecture

Claims (1)

[Scope of utility model registration request] 1. The reference tube has a stopper protruding in a ring shape attached to the inner peripheral surface of both end openings, and the first movable tube inserted into the reference tube has a reference tube on the outer peripheral surface of the tip end on the insertion side. A sealing member that comes into contact with the inner peripheral surface of the first movable tube is mounted, and a stopper that contacts the end surface of the reference tube and a second movable member that is inserted into the outer peripheral surface on the opposite side of the first movable tube and the inner peripheral surface on the tip side thereof. A plurality of movable pipes each having a stopper that comes into contact with the outer protruding portion on the tip end side of the pipe and having the same configuration as the first movable pipe, and the outer diameter of which gradually decreases, have an inner diameter slightly larger than those of adjacent ones. The movable tube with the smallest diameter farthest from the reference tube is sequentially inserted into the movable tube, and the sealing is attached to the outer peripheral surface of the tip end on the side to be inserted, and the connecting means is provided on the tip end on the opposite side. An expandable pipe for piping.