JP2535695Y2 - Butt welding equipment for synthetic resin pipes - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding apparatus for butt-welding a pipe made of a heat-fusible synthetic resin such as polyarylene sulfide containing polyphenylene sulfide resin (hereinafter referred to as PPS).

[0002]

2. Description of the Related Art A synthetic resin tube made of PPS or the like has an extremely small amount of water-soluble components, and is therefore suitable for use in piping of ultrapure water for cleaning in the manufacture of electronic devices such as ultra LSI. Furthermore, when piping pipes made of PPS resin or the like,
The so-called butt welding, in which the ends of the pipes are melted by heat and joined together, has been widely adopted because joining with an adhesive is difficult or elution from the adhesive becomes a problem. As such a conventional butt welding apparatus, there is Japanese Patent Publication No. Sho 6
As disclosed in Japanese Patent Application Laid-Open No. 3-28011, a heating plate is brought into contact with both end faces of a resin pipe, the both end faces of the resin pipe are melted, and then the melted both end faces are bonded by pressing. Such an apparatus is known and is disclosed in
As disclosed in Japanese Patent Publication No. 279925, without using a heating plate, hot air is blown onto both end surfaces of a resin tube to melt the both end surfaces in a non-contact manner, and then, the melted both end surfaces are pressed. A joining method is also known.

[0003]

[Problem to be solved by the invention]
According to the apparatus disclosed in Japanese Patent No. 28011, the heating plate is brought into contact with both end surfaces of the resin pipe, so that it is not easy to remove the heating plate from both end surfaces after heating. This is because if the heating plate cannot be removed from both end surfaces of the molten resin tube while maintaining its shape in a predetermined shape, a protrusion called a bead (also referred to as a burr) is generated on the inner surface of the joint, This is because the joint may be bent. If there is such a bead at the joint, the flow of the fluid in the pipe will be disturbed there,
This may cause the accumulation of fine particles and the generation of bacteria and algae, making the pipe unsuitable for ultrapure water. In addition, the above-mentioned method in which both end surfaces of the tube are brought into contact with the heating plate has a problem that a small amount of molten resin adhered to the heating plate is gradually subjected to thermal denaturation, and is mixed into the molten resin as an impurity during the next pressure welding operation. There is also.

Further, according to the method disclosed in Japanese Patent Application Laid-Open No. 62-279925, it is necessary to rotate the resin tube, so it is difficult to apply the method to a long resin tube. Both ends melted by wind pressure from the steel have a tendency to bend slightly toward the center, and if both ends are slightly bent toward the center in this way, there is a risk of promoting the generation of beads and this tendency If a tapered groove is provided, the strength becomes even stronger. In addition, if the rotation is not performed in a predetermined manner, there is a possibility that both end surfaces may be degraded by oxidizing heat due to the hot air, and in any case, it cannot be said to be satisfactory.

[0005] In view of the above problems, the present applicant has
First, in Japanese Patent Application No. 27358/1992, a pair of chucks sandwiching respective ends of a pair of synthetic resin tubes to be welded, and a pair of chucks disposed between the chucks are used. A movable spacer that sets an end face distance, a movable heating plate that is disposed with a gap between end faces of the pipe where the end face distance is set to a predetermined value, and heats both end faces in a non-contact state; A heating plate moving device that moves between and outside the surface, a chuck moving device that moves at least one of the pair of chucks, and presses the end faces heated and melted by the heating plate with a predetermined pressure, and a heating plate A butt welding apparatus for synthetic resin pipes, comprising a moving device and a control device for controlling the operation of the chuck moving device, has been proposed.

The butt welding apparatus for a synthetic resin pipe according to the present invention can heat and melt both ends of the synthetic resin pipe by a heating plate in a non-contact manner, and additionally minimizes the generation of beads. It is possible to automatically perform butt welding of a synthetic resin pipe while minimizing the occurrence of beads, without causing oxidative heat deterioration and the like, and to solve the above-mentioned problem preferably. However, in the specific welding apparatus according to the present proposal, when trying to butt-weld pipes having different outer diameters, complicated operations such as replacing a chuck member or attaching an attachment to the chuck member are required, which is an efficient method. Butt welding is difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned points, and an object thereof is to replace a chuck member or attach an attachment to a chuck member even when butt welding pipes having different outer diameters. An object of the present invention is to provide a butt-welding apparatus for a synthetic resin pipe, which can obviate a complicated operation such as attaching a member or the like, and can perform an efficient butt-welding.

[0008]

SUMMARY OF THE INVENTION According to the present invention, the above objects are attained by a pair of chucks for holding respective ends of a pair of synthetic resin tubes to be welded, and a pair of chucks for holding the ends of the tubes. A chuck moving device that moves the chucking opposing holding surfaces toward and away from each other in a direction perpendicular to the center of the tube, a movable spacer used between the chucks to set the distance between the end surfaces of the pair of tubes, and the end surface. A movable heating plate that is disposed with a gap between the end surfaces of the tube whose distance is set to a predetermined value and heats both end surfaces in a non-contact state, and a heating plate movement that moves the heating plate between the both end surfaces and outward thereof. An apparatus, another chuck moving device that moves at least one of a pair of chucks and presses the end faces heated and melted by the heating plate with a predetermined pressure, and an operation of the heating plate moving device and another chuck moving device. Control Is achieved by that the control device and comprising a synthetic resin pipe butt welding apparatus.

In the present invention, preferably, each chuck includes a pair of chuck members each having a clamping surface, and the chuck moving device for moving the opposed clamping surfaces of each chuck toward and away from each other includes a guide rail and this guide. A pair of slider blocks, which are movably fitted to the rails and support the respective chuck members, and a rotatable screw rod in which the pair of slider blocks are screwed and arranged in parallel with the guide rail. In the threaded rod, the threading direction of the threaded portion to which one of the slider blocks is screwed is:
It is opposite to the thread cutting direction of the threaded portion to which the other slider block is screwed.

In the present invention, it is not necessary to move the two chuck members to move the opposing holding surfaces toward and away from each other as described above, but to move only one chuck member to move the opposing holding surfaces to each other. You may make it approach and separate.

[0011]

In the butt-welding apparatus for synthetic resin pipes of the present invention, a pair of synthetic resin pipes to be butt-welded with a movable spacer disposed between a pair of chucks and in contact with the spacers. Each end is arranged. Each of the pair of tubes arranged in this manner is held and fixed by each of the chucks. Thereafter, the spacer is moved out of the space between the pair of chucks, and then a heating plate is arranged with a gap between the pipe end faces whose distance is set to a predetermined value by the spacer, whereby the both end faces are heated and melted in a non-contact state. When heated in this manner, the heating plate is moved out of the space between the pair of chucks, and then at least one of the pair of chucks is moved, and the both end surfaces heated and melted by the heating plate are pressed against each other at a predetermined pressure. Is done. In the butt welding of pipes having different outer diameters, the amount of approach between the opposing holding surfaces of the chucks is set in accordance with the outer diameter of the pipe by operating the chuck moving device.

Next, the present invention will be described in more detail based on preferred embodiments shown in the drawings. The present invention is not limited to these specific examples.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 to 7, a butt-welding apparatus 1 for a synthetic resin pipe according to the present embodiment comprises a pair of pipes 2 and 3 made of a synthetic resin to be butt-welded, in this example PPS. A pair of chucks 6 and 7 for holding the ends 4 and 5 of
, The opposed clamping surfaces of the chucks 6 and 7 for clamping the ends 4 and 5 of the chucks 3, that is, the opposed clamping surfaces 8 and 9 for the chuck 6, the opposed clamping surfaces 10 and 11 for the chuck 7, The chuck moving devices 13 and 14 which approach and separate from each other in the direction orthogonal to the center 12 of the tubes 2 and 3, that is, in the direction A, and the distance between the end faces 15 and 16 of the tubes 2 and 3 which are disposed between the chucks 6 and 7. A movable spacer 17 for setting D1 to a predetermined value, and a pipe end face 15 for which the distance D1 is set to a predetermined value by the spacer 17
A movable heating plate 18 disposed between the first and second tubes 16 and 16 with gaps D2 and D3 to heat the opposed end surfaces 15 and 16 of the tubes 2 and 3 in a non-contact state; And 16 and at least one of the chucks 6 and 7, in this example, the chuck 6 is moved to move the end faces of the tubes 2 and 3 heated and melted by the heating plate 18. The apparatus includes a chuck moving device 20 for pressing the members 15 and 16 together at a predetermined pressure, and a control device 21 for controlling operations of the heating plate moving device 18 and the chuck moving device 20.

As shown in FIG. 6, the chuck 6 includes a pair of chuck members 31 and 32 having clamping surfaces 8 and 9, respectively. Chuck member 3 having clamping surface 8
1 is a stainless steel 2 each having a thickness of 3 mm.
Chuck plates 33, a 3.2 mm thick stainless steel spacer plate 34 disposed between the chuck plates 33, and a 3.2 mm thick stainless steel reinforcing plate disposed on one side of the chuck plate 33. 35, and these two chuck plates 33, the spacer plate 34, and the reinforcing plate 35 are connected by screws 36 to be integrated, and the chuck plate 3
The holding surface 8 is formed by a substantially semi-rectangular cutout recess formed at one edge of each of the three. The chuck member 32 having the holding surface 9 is also formed in the same manner as the chuck member 31, and has two stainless steel chuck plates 37 each having a thickness of 3 mm and a thickness 3 disposed between the chuck plates 37. A 2 mm stainless steel spacer plate 38,
A 3.2 mm-thick stainless steel reinforcing plate 39 disposed on the side surface of one of the chuck plates 37;
The chuck plate 37, the spacer plate 38, and the reinforcing plate 39 are connected and integrated by screws 40, and the holding surface 9 is formed by a substantially semi-rectangular notch recess formed on one edge of each of the chuck plates 37. Is formed. The two chuck plates 33 are arranged on the spacer plate 38 and the reinforcing plate 39, and the spacer plate 34 and the reinforcing plate 35 are arranged on the two chuck plates 37 so as to face each other in the A direction.

On the other hand, the chuck 7 is formed almost similarly to the chuck 6. That is, the chuck 7 is a pair of chuck members 51 and 5 having the holding surfaces 10 and 11, respectively.
2, the chuck member 51 having the holding surface 10
2. Two stainless steel chuck plates 53 each having a thickness of 3 mm, and a thickness of 3 mm disposed between the chuck plates 53.
A stainless steel spacer plate 54 having a thickness of 2 mm and a stainless steel reinforcing plate 55 having a thickness of 3.2 mm disposed on the side surface of one of the chuck plates 53 are provided. The reinforcing plate 55 is connected and integrated by a screw 56, and the holding surface 10 is formed by a substantially semi-rectangular notch recess formed at one edge of each of the chuck plates 53. The chuck member 52 is also formed in the same manner as the chuck member 51. Two chuck plates 57 each made of stainless steel having a thickness of 3 mm, and a stainless steel plate 3.2 mm thick disposed between the chuck plates 57. Spacer plate 58 and a 3.2 mm-thick stainless steel reinforcing plate 59 disposed on the side surface of one of the chuck plates 57. The spacer plate 58 and the reinforcing plate 59 are connected and integrated by screws 60, and the holding surface 11 is formed by a substantially semi-rectangular cutout recess formed on one edge of each of the chuck plates 57. The chuck plate 53 is provided on the spacer plate 58 and the reinforcing plate 59 with the spacer plate 5.
4 and the reinforcing plate 55 are attached to two chuck plates 57 respectively.
They are arranged facing each other in the direction. As described above, in the chuck 6 and the chuck 7, when the spacer plates are formed thicker than the chuck plates and these are alternately arranged as shown in FIG. It can be arranged between the chuck plates of the other chuck member, and can also clamp tubes 2 and 3 of sufficiently small diameter.

As shown in FIG. 4, the chuck moving device 13
A guide rail 63 whose ends are supported by a pair of opposing support members 61 and 62,
Slider blocks 66 and 67 having a pair of slider portions 64 and 65 fitted movably in the directions, and block portions 68 and 6 of the pair of slider blocks 66 and 67.
9 is provided with a screw rod 70 disposed in parallel with the guide rail 63. In the screw rod 70, the screw part 71 of the one slider block 66 is screwed with the screw part 71. The threading direction is opposite to the threading direction of the threaded portion 72 with which the block portion 69 of the other slider block 67 is screwed, and the threading pitch is formed to be the same. The block portion 68 is attached to the slider portion 64 by screws 81 and the block portion 69 is attached to the slider portion 65 by screws 82, and the chuck member 31 is attached to the block portion 68 of the slider block 66 by screws 83. The chuck member 32 is attached to and supported on the block portion 69 of the slider block 67 by screws 84. The screw rod 70 is supported at both ends by supporting members 61 respectively.
, And 62 are rotatably supported, and the ends 85 and 86 protruding from the support members 61 and 62 are formed so as to be easily rotated by a tool.

As shown in FIG. 3, the chuck moving device 14
Is formed substantially in the same manner as the chuck moving device 13, and has a guide rail 93 whose ends are supported by a pair of opposing support members 91 and 92, respectively.
Slider blocks 96 and 97 having a pair of slider portions 94 and 95 fitted movably in the directions, and block portions 98 and 9 of the pair of slider blocks 96 and 97.
9 is screwed, and has a screw rod 100 arranged in parallel with the guide rail 93. In the screw rod 100, the screw part 101 of the one slider block 96 with which the block part 98 is screwed is screwed. The threading direction is the thread portion 102 with which the block portion 99 of the other slider block 97 is screwed.
And the threading pitch is formed to be the same. Block 98 is screw 1
11 to the slider portion 94 and the block portion 99 to the screw 1
The chuck member 51 is attached to and supported by the block portion 98 of the slider block 96 by screws 113, and the chuck member 52 is attached to the slider block 97 by screws 114. It is attached to and supported by the block 99. The screw rod 100 is rotatably supported at both ends by support members 91 and 92, respectively, and ends 115 and 116 protruding from the support members 91 and 92 are squarely formed so that they can be easily rotated by a tool. ing.

As described above, in the screw portion 71 and the screw portion 72, and in the screw portion 101 and the screw portion 102,
If the threading directions are opposite to each other and the threading pitch is the same, tubes 2 and 3 of different outer diameters can be brought to the ends 85 or 8 without changing the position of the center 12.
Only the rotation of the tool 6 and the end 115 or 116 by the tool can be held between the chuck 6 and the chuck 7.

The threading directions of the threaded portions 71 and 101 and the threading direction of the threaded portions 72 and 102 are the same in this embodiment.

As shown in FIG. 7, in this embodiment, the spacer 17 comprises a main body 131 made of a rectangular plate-like member having a thickness D1 = 40 mm, and a flange 132 formed integrally on one end surface of the main body 131. And a handle 133 attached to the front end surface of the main body 131 with screws or the like. Note that the thickness D1 is not limited to this, and it goes without saying that the thickness D1 is determined from the thickness of the heating plate 18 and the set values of the gaps D2 and D3. In use, the spacer 17 is disposed between the chuck members 6 and 7 with the handle 133 so that the flange portion 13 is used.
2 is placed and held on a locking plate 134 attached to the chuck plates 33 and 57 and the reinforcing plates 39 and 55 by screws or the like. A plurality of holes 135 may be formed in the main body 131 to reduce the weight of the main body 131. Instead of manually disposing the spacer 17 between the chuck members 6 and 7 in this manner, the spacer 17 is automatically disposed between the chuck members 6 and 7 using an electric motor or a hydraulic cylinder. Is also good.

As shown in FIG. 2, the heating plate 18 in this embodiment is formed of a case made of a perforated ceramic plate in which a nichrome wire is accommodated. However, the heating plate 18 can uniformly heat the end faces 15 and 16 of the tubes 2 and 3. The heating plate, for example, a rod-shaped heating wire may be uniformly embedded in the entire surface of an electrically insulating member such as ceramic. The surface temperature of the heating plate 18 can be appropriately determined by the melting temperature of the tubes 2 and 3 to be butt-welded, the gaps D2 and D3, the heating time, and the like. In this example where D2 = D3 = 1.0 mm, 445 ° C. to 455 ° C. Is preferably used.

As shown in FIG. 3, the heating plate moving device 19
Is a pneumatic cylinder device 143 attached to the base 141 via the bracket 142, a connecting plate 145 having one end connected to the tip of the piston rod 144 of the pneumatic cylinder device 143, and a connecting plate 145 having the other end. Screw 146
A slider 147 mounted on the base 141, the slider 147 being movably fitted in the direction A, and mounted on the base 141;
And the arm 1 having the other end connected to the connecting plate 145, respectively.
When the pneumatic cylinder device 143 is actuated and its piston rod 144 is moved in the direction A, the slider 147 also moves to the A position via the connecting plate 145.
The heating plate 18 is also moved in the direction A via the arm 149, so that the heating plate 18 is moved between the opposite end faces 15 and 16 of the tubes 2 and 3 and in that direction. Moved out. Alternatively, the pneumatic cylinder device 143 may be configured with, for example, a hydraulic cylinder device or an electric motor, or may be configured with a rotary type instead of the direct-acting type.

As shown in FIGS. 4 and 5, the chuck moving device 20 includes a thin pneumatic cylinder device 151 supported on a base 141 via a bracket or the like, and a piston rod 152 of the pneumatic cylinder device 151. Moving table 1 connected to the tip via connecting member 153 and screw 154
55, sliders 157 and 158 attached to both ends of the moving base 155 via screws 156 and the like, and slider 1
Each of the guide rails 157 and 158 is provided with guide rails 159 and 160 movably fitted in the C direction, and the base 161 of the guide rail 63 and the support members 61 and 62 are provided on the movable base 155 with screws 162 and 163. And the base 16 of the guide rails 159 and 160
4 and 165 are attached to the base 141. When the pneumatic cylinder device 151 is operated, the piston rod 1
When the base 52 is expanded and contracted in the C direction, the moving table 155 is guided by the guide rails 159 and 160 via the connecting member 153, and is similarly moved in the C direction.
Are also moved with respect to the C direction. Chuck moving device 2
0 indicates that the chuck 6 is moved toward the chuck 7 and the end face 1 of the tube heated and melted by the heating plate 18 at the same time.
5 and 16 are pressed against each other at a predetermined pressure. The pressure of the pipes 2 and 3 against the end faces 15 and 16 is
Can be determined by the presence or absence of a groove on the end surfaces 15 and 16 of the pipes, the heating time, the material of the tubes 2 and 3, etc., but in this example, the groove angle is 30 degrees, the groove length is 1 mm, the heating time is 45 seconds, and D
When 2 = D3 = 1.0 mm, the pressure is about 2 kgf per square centimeter. In this example, the pneumatic cylinder device 1 is used as a power source of the chuck moving device 20.
Although the aeroelastic pressure is obtained by using 51, a hydraulic cylinder or an electric motor may be used similarly to the above-described devices.

As shown in FIG. 2, the support members 91 and 92 and the base 201 of the guide rail 93 are provided with screws 202.
And 203 are attached to the base block 204, respectively, and the base block 204 is similarly fixed to the base 141 by screws or the like.

As shown in FIG. 1, the control device 21 includes a control electric circuit disposed in a housing 171 below the base 141,
Push button switch 172 for instructing operation start
173, a reset push button switch 173, a timer 174 for setting and measuring the heating time, a timer 175 for setting and measuring the pressure welding time, and a limit switch. The control electric circuit sends an operation signal to the hot plate moving device 19 and the chuck moving device 20 to perform an operation described later based on electric signals from the switches 172 and 173, the limit switch, and the timers 174 and 175. The control electric circuit including the timer may be constituted by a microcomputer, and the operation of the butt welding apparatus 1 may be performed by a program stored in advance. The limit switch detects the left-right movement position in the movement of the heating plate 18 in the direction A, and sends an electric signal of the position to the control electric circuit. The heating time measured by the timer 174 is 45 seconds in this example, but the heating time is the surface temperature of the heating plate 18, the melting temperature of the end faces 15 and 16 determined by the materials of the tubes 2 and 3, the gaps D2 and D3, and the opening time. It can be set as appropriate depending on the presence or absence of the point. The controller 21 includes a temperature controller 176 for controlling the temperature of the heating plate 18 and the pneumatic cylinder device 1.
A main air pressure setting device 181, a pressure setting device 182, a display lamp 183 during heating, a display lamp 184 during pressing, and an operation completion display lamp 185 related to the pressure reducing valve used in combination with 51 are provided.

As shown in FIG. 2, supporting devices 191 and 192 for supporting the tubes 2 and 3 are attached to the base 141, and the supporting devices 191 and 192 are fixed to the base 141, respectively. Hollow columns 193 and 19
4; and vertically extending telescopic fork members 195 and 196 nested on the hollow columns 193 and 194, respectively, and thumb screws 198 and 199 for fixing the respective telescopic positions of the fork members 195 and 196. . A protective cover 197 is attached to the base 141 so as to cover the heating plate 18.

The butt welding apparatus 1 operates as follows. First, the inside of the cylinder of the pneumatic cylinder device 151 is opened to the outside, then the spacer 17 is arranged between the chucks 6 and 7, the chuck 6 is manually moved toward the chuck 7, and the spacer 17 is chucked by the locking plate 134. Hold between 6 and 7. At this time, the flange 132 is brought into contact with the chucks 6 and 7 exactly. Next, the supporting device 191
Ends 15 and 16 of tubes 2 and 3 supported by, and 192 are attached to side surfaces 221 and 22 of body 131 of spacer 17.
2 and the tools are used to rotate the threaded rods 72 and 100 so that the chuck members 31 and 32 and the chuck members 51 and 52 approach each other so that the ends 4 and 5 of the tubes 2 and 3 are close to each other. Are held by the holding surfaces 8, 9 and 10, 11 of the chucks 6 and 7, respectively.

After the initial setting, when the switch 172 is pressed, the pneumatic cylinder device 143 is operated first. The heating plate 18 is moved in the direction A by the operation of the pneumatic cylinder device 143. Since the heating plate 18 is narrower than the thickness D1 of the spacer 17 by the gaps D2 and D3, the heating plate 18 has two end surfaces without contacting the end surfaces 15 and 16 of the tubes 2 and 3. 15 and 16 are disposed between both chucks 6 and 7 with gaps D2 and D3 respectively. When the heating plate 18 is disposed at this position, a detection signal is generated from a limit switch for detecting the heating plate 18, whereby the movement of the pneumatic cylinder device 143 in the direction A with respect to the heating plate 18 is stopped, and the state is maintained. At the same time, the timer 174 starts the operation of measuring the heating time. When the heating plate 18 is thus disposed between the end surfaces 15 and 16, the end surfaces 15 and 16 are heated by the heating plate 18 for a predetermined time and melted. The melting start temperature of the pipes 2 and 3 of this example (the temperature at which endothermic occurs due to the melting of the sample in the differential scanning calorimeter) is 220 ° C., and is higher than this temperature, preferably lower than the melting end temperature. And 16, more specifically, the region from the end faces 15 and 16 to about 0.5 mm in the axial direction, respectively, is heated and melted. When the set time of 45 seconds has elapsed from the heating and melting conditions, a timer completion signal is issued from the timer 174, whereby the pneumatic cylinder device 143 is operated again. With this operation of the pneumatic cylinder device 143, the heating plate 18 starts to move in the opposite direction, and the heating plate 18 is disposed between the two chucks 6 and 7. Thereafter, the heating plate 18 is moved to the initial position by the pneumatic cylinder device 143, and when a detection signal is issued from a limit switch for detecting this, the pneumatic cylinder device 1
The movement of the heating plate 18 in the direction A with respect to 43 is stopped, and the state is maintained.

On the other hand, the detection signal from the limit switch for detecting the return of the heating plate 18 to the initial position
At the same time, the operation for measuring the press-contact time 5 is started, and at the same time, the pneumatic cylinder device 151 is operated. The operation of the pneumatic cylinder device 151 moves the moving table 155 in the direction C so that the chuck 6 approaches the chuck 7. As a result, the end face 15 of the tube 2 held by the chuck 6 is
End face 1 which is brought close to the end face 16 of the
5 is pressed against the end surface 16 which is also heated and melted. The time from when the heating plate 18 is disposed outside the chucks 6 and 7 to the pressing operation is such that the melting start temperature of the tubes 2 and 3 is as high as 220 ° C., and the tubes 2 and 3 may be cooled immediately. Therefore, it is required to be extremely short, which is about 0.5 seconds in this example, but it is preferable to shorten this as much as possible.

After the completion of the pressure welding and the elapse of the time until the welding portion is completely cooled, the screw shafts 72 and 100 are rotated by the tool in the opposite direction, and the chuck members 31 and 32 and the chuck members 51 and 52 are rotated. Are separated from each other so that the ends 4 and 5 of the tubes 2 and 3 are released from being clamped by the chucks 6 and 7 respectively, and the butt-welded tubes 2 and 3 are removed by hand. A synthetic resin tube can be obtained. After this switch 17
3, the pneumatic cylinder device 151 is operated again. With the operation of the pneumatic cylinder device 151, the moving table 155 is moved to C so that the chuck 6 is separated from the chuck 7.
When the carriage 155 is brought to the initial position, the operation of the pneumatic cylinder device 151 is stopped by a signal from a limit switch that detects the movement, and the carriage 155 is moved.
Is held in that position. Thereafter, pipes 2 and 3 to be newly butt-welded are arranged on the chucks 6 and 7, and the above operation is repeated one after another.

As described above, in the butt welding apparatus 1 of the present embodiment, the distance D1 between the end faces 15 and 16 to be heated and melted is always made constant by the spacer 17 in advance, and the distance D1 between the fixed end faces 15 and 16 is kept constant. Heating plate 18 arranged in contact
As a result, the end surfaces 15 and 16 made of PPS are uniformly heated and melted, so that there is no fear of bending and deformation of the heated and melted portion which may occur when the heating plate 18 is removed, and furthermore, the generation of beads is minimized. In addition, the possibility of heat degradation due to oxidation is extremely low. In the butt welding apparatus 1, the concave holding surfaces 8 and 9 and 10 and 11
Since the tubes 2 and 3 are formed so as to approach and separate from each other with respect to the direction, and to support the tubes 2 and 3 by the holding surfaces 8 and 9 and 10 and 11, when butt-welding tubes having different outer diameters, screws are required. Since the pipes having different outer diameters can be supported by being held between the holding surfaces 8 and 9 and 10 and 11 only by making the rotation amounts of the rods 72 and 100 correspond to the rotation amounts, the work becomes extremely easy.

By the way, in the butt welding apparatus 1 of the above example,
Although the heating plate 18 is linearly moved in the direction A by the pneumatic cylinder device 143, the present invention is not limited to this. For example, a butt welding device 301 may be formed as shown in FIGS. In the butt welding apparatus 301, the hot plate moving apparatus 30
2 is a pneumatic rotary actuator 30 attached to a support block 303 via a bracket 304.
5 and the output rotary shaft 30 of the rotary actuator 305
6 is provided with an arm 307 having one end attached thereto. The heating plate 18 is attached to the other end of the arm 307, and when the output rotary shaft 306 is rotated by the operation of the rotary actuator 305, the heating plate 18 Is pivoted in the R direction to be disposed between the chucks 6 and 7, and to be disposed outside thereof. As described above, the rotary actuator 305 may form the hot plate moving device of the present invention. Also, the butt welding apparatus 301 of the present embodiment
Then, the chuck moving device 311 includes the support block 303.
And a pair of guide rods 3 having one end attached to the support block 303.
13 and 314, and a movable block 315 through which the guide rods 313 and 314 penetrate and are movably guided and supported in the C direction by the guide rods 313 and 314. The piston rod of the pneumatic cylinder device 312 The tip of 317 is connected to the movable block 315 by a nut 318 or the like, and the support members 61 and 62 and the moving table 155 described above are provided.
Is attached to the movable block 315. Even with such a chuck moving device 311, the moving table 155 can be moved in the C direction by the expansion and contraction of the piston rod 317 due to the operation of the pneumatic cylinder device 312, so that the chuck 6 can approach the chuck 7. Thus, the end faces 15 and 16 of the tubes 2 and 3 can be pressed against each other. Therefore, the butt welding apparatus 301 of this example
However, the same operation and effect as the butt welding device 1 can be obtained.

Also, the butt welding apparatuses 1 and 301 of the above example are used.
In this embodiment, the heating plate 18 is configured using a separately prepared spacer 17, but for example, as shown in FIG.
01, a spacer 402 and a heating plate 403 are attached, and the movable table 401 is connected to a cylinder device equivalent to the above-described pneumatic cylinder device 143. First, the movable table is mounted so that the spacer 402 is disposed between the chucks 6 and 7. The movable table 401 is further moved in the same direction by the cylinder device so that the heating plate 403 is moved between the end faces of the two tubes sandwiched by the chucks 6 and 7 by moving the 401 by the cylinder device. If the setting of the predetermined distance between the end faces of the pipes and the heating thereof can be performed automatically and in a series of operations, it is possible to save labor and perform the butt welding work in a shorter time. It can be preferable. In this case, a heat insulating space or a heat insulating member may be provided between the heating plate 403 and the spacer 402 so that heat of the heating plate 403 is not transmitted to the spacer 402.

[0034]

As described above, according to the present invention, the distance between the end faces of the pipe to be heated and melted is always made constant by the spacer beforehand, and the heating is arranged in a non-contact manner between the fixed end faces. Since both ends of the synthetic resin pipe are uniformly heated and melted by the plate, the risk of bending and deformation of the heated and melted portion which may occur when removing the heating plate can be eliminated, and furthermore, the occurrence of beads is minimized. In addition, there is very little risk of oxidative heat deterioration and the like, and the butt welding can be performed automatically and continuously. As a result, the working time can be reduced, and the butt welding of pipes having different outer diameters can be performed. Can easily clamp and support pipes of different outer diameters without removing members and parts, and the butt welding operation becomes extremely easy.

[Brief description of the drawings]

FIG. 1 is a perspective view of a preferred embodiment of the present invention.

FIG. 2 is a front view of the specific example shown in FIG.

FIG. 3 is a right side view of the specific example shown in FIG. 1;

FIG. 4 is a partial left side view of the specific example shown in FIG. 1;

FIG. 5 is a partially detailed front view of the specific example shown in FIG. 1;

FIG. 6 is a partial plan view of the specific example shown in FIG. 1;

FIG. 7 is a perspective view of the spacer of the specific example shown in FIG. 1;

FIG. 8 is a left side view of another preferred embodiment of the present invention.

FIG. 9 is a front view of the specific example shown in FIG. 8;

FIG. 10 is an explanatory view of still another preferred embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 butt welding device 2, 3 tube 6, 7 chuck 13, 14 chuck moving device 17 spacer 18 heating plate 19 heating plate moving device 20 chuck moving device

Claims (2)

(57) [Scope of request for utility model registration] 1. A pair of chucks for holding respective ends of a pair of synthetic resin tubes to be welded, and opposing holding surfaces of the chucks for holding the ends of the tubes are orthogonal to the center of the tube. A chuck moving device that moves toward and away from each other in the direction, a movable spacer that is used between the chucks, and sets the end face distance of the pair of pipes, and the end faces of the pipes whose end face distances are set to a predetermined value. A movable heating plate that is arranged with a gap and heats both end surfaces in a non-contact state, a heating plate moving device that moves the heating plate between both end surfaces and outward thereof, and moves at least one of a pair of chucks. A synthetic resin comprising: another chuck moving device for pressing the end faces heated and melted by the heating plate at a predetermined pressure, and a control device for controlling operations of the heating plate moving device and the other chuck moving device. Made of pipe Butt welding equipment. 2. Each chuck has a pair of chuck members each having a clamping surface, and a chuck moving device for moving the opposed clamping surfaces of each chuck toward and away from each other is a guide rail, and is movable on the guide rail. And a pair of slider blocks supporting each chuck member, and a rotatable screw rod in which the pair of slider blocks are screwed and arranged in parallel with the guide rail. 2. The butt welding of a synthetic resin pipe according to claim 1, wherein, in the threaded rod, a threading direction of a threaded portion to which one of the slider blocks is screwed is opposite to a threading direction of a threaded portion to which the other slider block is threaded. apparatus.