JPH079566A - Fusion-bonding machine - Google Patents

Abstract

PURPOSE:To provide a fusion-bonding machine which can always fusion-bond to connect under stable conditions even if sizes of a tube-joint to be connected are altered and has high reliability of connecting strength. CONSTITUTION:The fusion-bonding machine comprises a plurality of air pressure regulators R1,..., R5 for an air cylinder 20 for clamping to move in the case of butt fusion-bonding, wherein any one regulator is selected in response to a length of a locking pin of a liner of a bore type to be mounted at a clamp to connect the regulator R3 to the cylinder 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fusing machine for joining pipe materials such as pipes and joints formed of a thermoplastic resin such as PPS and a pipe material by butt fusion.

[0002]

2. Description of the Related Art As a fusion bonding machine for piping materials of thermoplastic resin molded products, a piping material is grasped by a pair of clamps, and a connecting end portion of each piping material is melted by heating with a heater, and then a handle is operated. There is a structure in which one clamp is moved toward the other clamp to abut and fuse the respective melted portions at a predetermined pressure (for example, Japanese Utility Model Laid-Open No. 56-26217). Further, as another fusing machine, there is a system device in which a clamp is automatically moved by a mechanism using an air cylinder.

In general, this type of fusion splicer is of a type that can be used to connect a plurality of types of pipes with a single device.

[0004]

By the way, according to the fusion machine for joining by butt fusion, when changing the diameter of the pipe to be connected, the butt load is changed according to the diameter every time the size is changed. There is a need. However,
According to the conventional fusion machine described above, the pressure when the pipes are butted is adjusted manually by the operator, such as torque control by operating the handle or adjusting the air cylinder regulator. The butt load varies each time the replacement is performed, and thus it is not possible to always obtain stable joint strength.

The present invention has been made in view of such circumstances, and an object of the present invention is to perform fusion splicing always under stable conditions even if the size of a pipe / joint to be connected is changed, so that the splicing can be performed. It is to provide a fusion splicer having high strength reliability.

[0006]

A structure for achieving the above object will be described with reference to FIGS. 1 to 4 corresponding to an embodiment. The present invention will be described with reference to a fixed side clamp 1 and a movable side clamp 2. And an air cylinder 20 for giving the movement,
These two clamps 1 and 2 have a heater 3 for heating each connection end portion of the piping materials P and J gripped, and the clamps 1 and 2 grip piping materials of plural kinds by changing the liner. In the fusion machine of the obtained structure, the liner of each diameter type (for example, the liner L3 of the fixed side clamp) is provided with the lock pins P2 and P3 having mutually different lengths, and the clamp 1 is provided with a lock. Sensors S1 ... S5 for detecting the tip positions of the pins are arranged in a positional relationship corresponding to the length of each pin, and the air cylinder 20
The air pressure circuit 21 has a number of air pressure controllers R1 ... R5 corresponding to each caliber of the liner, and switching means (electromagnetism) for selectively connecting any one of the air pressure controllers to the air cylinder. Valves V1 ... V5) are provided. It is characterized by including a controller 7 that controls switching of the connection according to the output of each sensor.

[0007]

[Function] When the liners of the clamps 1 and 2 are exchanged when the size of the pipe / joint to be connected is changed, the switching means is switched according to the length of the lock pin P3 of the liner L3 to connect to the air cylinder 20. The pneumatic controller R3 to be activated is automatically selected. Therefore, each air pressure controller R1 ... R5
By adjusting the adjustment pressure of each to be the pressure (butt load) suitable for each diameter type of the liner, that is, the size of the pipe / joint to be connected, each size can be adjusted to each size. Butt fusion is performed under suitable conditions.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a front view showing the structure of an embodiment of the present invention, and FIG. 2 is a plan view thereof. 3 is a cross-sectional view taken along the line AA of FIG. Note that the specific configuration of the heater 3 is omitted in FIG.

Fixed side clamp 1 and movable side clamp 2
Is for holding the pipe materials (PPS molded products) P and J to be joined, and is arranged on the bed 5. The clamps 1 and 2 are fixed to the ends of the mounts 1a and 2a slidably arranged on the guides 6a and 6b.
They are facing each other.

Each of the clamps 1 and 2 has a structure in which it is vertically divided into two parts, and the upper half of each of the clamps is structured to open upward with a hinge 1b (moving side not shown) as a center.
Tightening mechanisms 1c and 2c for fastening the upper and lower members are provided on the opposite sides of the respective hinges. Further, the grip centers of the pair of clamps 1 and 2 coincide with each other.

The pedestal 1a of the fixed-side clamp is fixed to the bed 5 via the position-controlling pressing rod 12 and its locking mechanism 10. The lock mechanism 10 is a mechanism for locking the movement of the pressing rod 12 by operating the lever 11 and releasing it. By operating the handle 13 in the unlocked state, the fixed side clamp The position of 1 with respect to the bed 5 can be adjusted.

A rod 20a of an air cylinder 20 is connected to a pedestal 2a of the moving side clamp.
By the movement (retraction) of 0a, the gantry 2a, that is, the moving side clamp 2 moves toward the fixed side clamp 1.

On the other hand, on the bed 5 of the fusion machine, as shown in FIGS. 2 and 3, a heater 3 and a spacer 4 are arranged at positions facing each other with a pair of clamps 1 and 2 interposed therebetween. ing.

The heater 3 has a heating temperature that can be arbitrarily set up to about 500 ° C., for example, a cartridge type heater is used. The heater 3 is selectively arranged at a standby position (upright state shown in FIG. 3) and a use position, that is, an intermediate position between the two clamps 1 and 2 by a rotation mechanism 30 using a geared motor 31 with a brake as a drive source. To be done. The rotation speed of the heater 3 is preferably within 0.5 seconds in one direction, and the heater 3 is preferably arranged at a position corresponding to the grip center of each of the clamps 1 and 2 in the use position. .

The spacer 4 is used for positioning when fixing the pipe members P and J to the clamps 1 and 2, and the whole thereof is supported by the manual rotation mechanism 40. The thickness of the spacer 4 is 2 mm thicker than that of the heater 3, and the positioning surface 4a of the spacer 4 is located in the operating position (intermediate position between the two clamps 1 and 2) by operating the lever 41 of the rotating mechanism. , 4b are set so that the positions of the heating surfaces 3a and 3b of the heater 3 are 1 mm apart from the fixed side clamp 1 and the movable side clamp 2, respectively.

Here, the procedure and operation for connecting the pipe and the joint by the fusion machine having the above structure will be briefly described. First, an operator sets the connection pipe members P and J on the fusion machine before performing the automatic fusion bonding operation. The setting is
Move the spacer 4 by manual operation and place it in the use position,
In this state, the pipe materials P and J are arranged in the two clamps 1 and 2, and the clamps 1 and 2 are closed / tightened in a state where the respective connection end surfaces thereof are in contact with the positioning surfaces 4a and 4b of the spacer 4. By doing so, the piping materials P and J are fixed. After setting,
Move the spacer 4 to the standby position. Further, the heater 2 is preheated and its temperature is kept at, for example, 400 ° C. or higher.

After the above setting is completed, the fusion welding automatic operation is started. First, the heater 2 is moved to the operating position,
After a certain time (melting time of the connection end portion) has passed, the heater 2 is retracted to the standby position, then the moving side clamp 2 is moved toward the fixed side clamp 1, and the pipe member P and the pipe member J are connected. Butt joining is performed by contacting the ends of each other.

In the embodiment of the present invention, each liner L3 of the pair of clamps 1 and 2 (only the clamp on the fixed side is shown) is replaceable, and the liner can be replaced by piping of plural kinds of diameters. Can hold materials. In addition, in this example, five fusion liners (L2, L2,
L3 etc .: See Fig. 4).
Lock pins P2 and P3 having lengths different from each other are provided at 2 and L3, respectively. These lock pins P2, P3
Is a pin for positioning and fixing when the liner is attached to the clamp.

Further, of the pair of clamps, in the fixed side clamp 1, as shown in FIG. 4, five proximity switches S1 ... S1 are provided around the hole 1h into which the preceding lock pin is fitted.
S5 is located. Each proximity switch S1 ... S5
Are located at a depth corresponding to the length of the lock pin (P3) of the liner (L3) of each diameter type mounted on the fixed side clamp 1. Further, these proximity switches S1 ... S5 are connected to the controller 7.

On the other hand, in the pneumatic circuit 21 of the air cylinder 20 which gives the movement to the moving side clamp 2, the air compressor 21 is provided.
Between the a and the cylinder 20, five air pressure regulators R1 ...
R5 is connected in parallel with each other. The respective adjusting pressures of the respective air pressure regulators R1..R5 are set to values (butt load) suitable for each size of the pipe material connected by this fusion machine. Further, each air pressure regulator R1 ... R5 is provided with a solenoid valve V1 whose opening / closing is controlled by the controller 7.
..V5s are connected to the respective outlets.

Then, the controller 7 sets only one of the preceding five solenoid valves V1 ... V5 to "open" based on the ON / OFF output of each proximity switch S1 ... S5. Then, set the other four valves to “closed”. That is, in the example of FIG. 4, since the liner L3 is attached to the clamp 1, only the proximity switch S3 at the position corresponding to the tip of the lock pin P3 is turned on, whereby only the solenoid valve V3 is opened, Compressed air is supplied to the air cylinder 20 through an air pressure regulator R3.

When the size is changed and the liner L2 is attached to the clamp 1, for example, the solenoid valve which becomes "open" is automatically switched from V3 to V2, whereby the driving pressure of the air cylinder 20 is changed. Is set by the air pressure regulator R2. Similarly, every time the liner is changed when the size is changed, the air pressure regulator (R1 ... R5) corresponding to the changed size is automatically selected.

In the above embodiment of the present invention, the number of air pressure regulators is five, but the number of air pressure regulators is not limited to this, and the number of air pressure regulators is arbitrary. Select according to the number of possible pipe diameter types.

Further, the clamp for arranging the proximity switch may be either a fixed side clamp or a movable side clamp, but considering the durability of the switch signal line and the like, it is preferable to provide the fixed side clamp. Further, instead of the proximity switch, another general position detection sensor such as a photoelectric switch may be adopted.

Furthermore, in the above embodiments, an example of connecting PPS piping material has been described. However, the fusion machine of the present invention is not limited to such a thermoplastic resin molded article having a high melting point, and is, for example, vinyl chloride. It can also be used to connect piping materials molded of low melting point resins such as.

[0026]

As described above, according to the fusion machine of the present invention, a plurality of air pressure regulators are provided for an air cylinder (one unit) that performs clamp movement during butt fusion. Since any one of the air pressure regulators is configured to be automatically selected according to the diameter of the liner attached to the clamp, even if the connecting pipe is resized, the butt load will not change after the change. Is automatically set to a value suitable for the size, and as a result, in any size of pipe connection, the respective fusion splicing conditions can be kept constant, resulting in improved reliability of the connection strength.

[Brief description of drawings]

FIG. 1 is a front view showing a structure of a mechanical portion according to an embodiment of the present invention.

FIG. 2 is a plan view of the embodiment.

3 is a sectional view taken along the line AA of FIG.

FIG. 4 is a diagram showing a configuration of a control unit according to the embodiment of the present invention, and is a diagram showing a block diagram of a pneumatic circuit 21 and a control system together.

[Explanation of symbols]

 1 Fixed side clamp 1h Positioning hole L2, L3 Liner P2, P3 Lock pin S1 ・ ・ S5 Proximity switch 2 Moving side clamp 20 Air cylinder 21 Air pressure circuit R1 ・ ・ R5 Air pressure regulator V1 ・ ・ V5 Solenoid valve 3 Heater 7 Controller P, J Piping material

Claims (1)

[Claims] 1. A device for connecting pipe materials such as pipes and joints formed of a thermoplastic resin by butt fusion welding, and a fixed side clamp for gripping one of the pipe materials to be connected, A moving side clamp that is arranged so as to be able to move toward and away from the clamp and that holds the other piping material to be connected, an air cylinder that gives that movement, and each connection end of the piping material that is gripped by these two clamps. Is provided with a heater that heats the connection end portion by heating the heater, and then the melted portions are abutted by the movement of the moving side clamp, and the clamp has a plurality of types by changing the liner. In a fusion machine having a structure capable of gripping pipe material of a diameter, the liner of each diameter type is provided with lock pins having different lengths from each other. The clamp is provided with a sensor for detecting the tip position of the lock pin in a positional relationship corresponding to the length of each pin, and the pneumatic circuit of the air cylinder is provided with each of the liner diameter types. And a switching means for selectively connecting any one of the air pressure controllers to the air cylinder, and switching of the connection is performed by each sensor output. A fusion machine comprising a controller for controlling according to the above.