JPS6330136B2 - - Google Patents

Abstract

PURPOSE:To enable to perform safely manual fusion welding which is performed inevitably, by providing a changeover device changing over to automatic locking and release of manual locking and a brake controlling a false motion by making pressure welding of a friction plate to a locking gear. CONSTITUTION:When manual fusion welding is performed inevitably between resin pipes, an operation screw 45 is changed over the manual operation from automatic operation by turning the screw 45 by an angle of 180 deg., a plunger 39 and locking cog 40 are pushed up against a compression spring 43 by an eccentric pin 46, locking to a locking gear 32 is released even if a solonoid is at a nondriving time and a false motion of a system of the locking gear 32 including an operation lever 9 making one of vises grasping the resin pipes bring close to the other one is prevented by only a brake 35 bringing a friction plate 34 into contact elastically with it. As a locking switch 39 does not operate at the time of manual operation, contact bonding through heating, fusion welding and pressure welding are performed by manual operation of the operation lever 9 and peeling of fusion welding is prevented by absorbing reaction shock at the time of slackening of pressure welding force after completion of the fusion welding.

Description

Detailed Description of the Invention (Object and Structure) The present invention provides a first vise that releasably grips a resin pipe or a resin socket pipe on one side;
A second vise that releasably grips the resin pipe or resin saddle pipe on the other side is installed on the machine base, with one vise fixed in position, or both vises slidable, and the pipes on both sides are welded. A rocking lever that controls pressure contact between surfaces, a lock gear that rotates in conjunction with the operation of the operating lever, and a lock gear that engages and separates from the lock gear when the solenoid is not driven and retreats when the solenoid is driven. The two vises are moved relatively close to each other by an operating lever, and the solenoid is deactivated in relation to joining the welding surfaces of the pipes on both sides, and the lock teeth are controlled by a plunger. A resin pipe welder that engages with a locking gear to automatically lock the locking gear is provided with a braking device that presses a friction plate against the locking gear by the elasticity of a spring, and a manual means that manually locks the plunger so that it cannot advance. The present invention relates to an automatic/manual switching device for a locking device for a resin pipe welder, and an object of the present invention is to provide a resin pipe welder that can be switched to manual mode at a timely manner to perform welding.

Most resin pipe welders are portable, and in order to prevent them from moving accidentally while being transported to the work site, when the solenoid is not connected to the power supply,
It is designed to generate a lock. In addition, a timer measures the time to heat the welded part of the resin pipe and the welding time to join the welded part, and an automatic braking device activated by the timer automatically commands the solenoid to deactivate to release the lock. The principle is to control. However, automatic control devices or solenoids often malfunction due to being hit by other objects while being transported to a work site or by other objects during use. However, since there is no failure in the automatic control equipment, etc., it is possible to perform manual welding using the operation lever while checking the required time using the work table, etc. However, if the solenoid cannot be driven, it will not be possible to lock the machine. cannot be released, which makes a series of manual welding impossible. In such a case, the present invention manually moves the lock teeth to the unlocked position, and the operation lever, lock gear, etc. are moved by a friction plate that suppresses the free rotation of the lock gear. Even if the pressing force is relaxed, the recoil shock of pressure release is alleviated, making it possible to perform welding without peeling.

(Example) An embodiment of the present invention will be described with reference to the drawings.

In this embodiment, one resin pipe a is attached to one side of the machine base 1.
A first vice 6 with a fixed position is provided to releasably grip the pipe a, and a slidable second vise 8 which releasably grips the resin pipe b having the same diameter as the pipe a is provided on the other side.
is provided, and the second vise 8 is moved to the first position by the operation lever 9.
This is an example of a welder that welds the end surfaces of pipes a and b in close proximity to the vise 6.

The machine base 1 has a support 2 with a first vise 6 installed at its upper end.
A pair of round bar-shaped rails 4 in the front and rear are provided in opposition to a column 3 on which an operating lever 9 is pivoted, and a mounting portion 7 of a second vise 8 is slidably mounted between both columns 2 and 3. and the connecting rod 5 are passed and fixed.

The first vise 6 and the second vise 8 each include a fixed piece 10 on the lower side, a movable piece 11 that is pivotally supported at one end on the fixed piece and swings in the direction of the arrow x in FIG. 2, and a shaft on the lower end. 14 is pivotally supported on the fixed piece 10, and the arrow y in Fig. 2 is moved at the appropriate time.
The movable piece 11 is configured to have a gate-shaped fastening tool 12 that swings in the direction and presses the free end of the movable piece 11 with a set screw 13 at the upper end. The fixed piece 10 and the movable piece 11 are provided with semicircular arc-shaped opposed grooves for gripping pipes a and b, respectively, and each groove has a semicircular arc shape for gripping a pipe with a small diameter. Auxiliary pieces 10a, 11a
It is designed so that it can be installed by fitting it in.

A protruding shaft 15 that protrudes outward through the support 3 is fixed to the mounting portion 7 of the second vise 8 , and the shaft 15 has a sliding shaft whose one end engages with a nut-shaped collar 16 at the outer end. A possible sleeve 18 is fitted and passed through the insertion hole 3a of the support column 3. The sleeve 18 has a rack 19 formed on its lower surface and a blind hole 20 at its front end. 21 is the protruding shaft 1
It is a cap-shaped adjustable spring receiving piece that is screwed onto a screw 17 provided on the front outer periphery of the spring receiving piece 5, and a part of the spring receiving piece is loosely inserted into the blind hole 20. A pressure detection spring 22 is provided in pressure contact with the adjustable spring receiving piece 21 and the sleeve tube 18.

Shaft 23 that crosses the underside of rack 19 on column 3
(see Figure 2), and the above-mentioned rack 1 is attached to the shaft.
The pinion 24 that meshes with and engages with the pinion 9 is fixed.
Further, the shaft 23 is provided with a small gear 25 at one end, and the other end of the shaft 23 is passed through a lock casing 31 attached to the support column 3. The operating lever 9 is rotatably supported by a shaft 26 which is supported below the small gear 25 and has a gear 27 fixed thereto, so that it can freely swing. intervene.

On the mounting portion 7 of the second vise 8 , locking switches 29 and 30 with respective push buttons 29a and 30a protruding along the path through which the sleeve 18 advances against the elasticity of the pressure detection spring 22 are installed as shown in FIG. provided in parallel to
When the auxiliary pieces 10a and 11a are fitted into the fixed piece 10 and the movable piece 11 of the second vise 8 , the circuit of the switch 29 is closed, and when the auxiliary pieces 10a and 11a are removed, the circuit of the switch 30 is closed. A changeover switch (not shown) is provided to close the switch.

A lock gear 32 is fitted and fixed to the shaft 23 in the lock casing 31 as shown in FIG. 2, and a friction plate 34 made of rubber or other material is pressed against the gear 32 by the elastic action of a spring 33 behind the lock gear 32. A braking device 35 is attached to the casing 31. In addition, the lock gear 32 is located at the left position of the vertical line L passing through the center of the shaft 23 (see the solid line in FIG. 1) as shown in FIG. The other end of a toggle spring 37, one end of which is fixed below the vertical line L, is hung on the pin 36, which is displaced to one of two positions on the right side of the vertical line L with the rotation of the toggle spring 9 to the left in FIG. Lock gear 32
A solenoid 38 is attached to the upper side, and a plunger 39 that is attracted in the lifting direction when the solenoid 38 is driven is provided with lock teeth 40 that oppose the lock gear 32.

The lock tooth 40 is attached to the horizontal shaft 39a of the plunger 39 so as to be able to move slightly, and furthermore, the guide post 41 fixed to the tooth 40 is passed through the guide member 42 attached to the lock casing 31, and the guide post 41 is inserted between the guide post 41 and the guide member 42. Lock tooth 40 when solenoid 38 is not driven.
A pressing spring 43 is provided which engages and locks the lock gear 32 as shown in FIG. solenoid 3
8 is the push button 29 of the lock switch 29 or 30
a, 30a are inserted into the circuit that is pushed by the sleeve 18 and closed.

An operating screw 45 (FIG. 4) is fitted into the cover 44 of the lock casing 31 so that it can rotate freely, and an eccentric pin 46 is provided on the end surface of the operating screw 45.
When the eccentric pin 46 is positioned downward by the rotation of
is engaged with the lock gear 32 as shown in FIG. 5 to lock the shaft 23 so that it cannot rotate, and at the same time lock the sleeve 18 and the operating lever 9 so that they cannot move or swing. At this time, when the solenoid 38 is activated, the plunger 39 and the lock teeth 40 are pulled up to perform the normal operation of releasing the lock. When the operating screw 45 is rotated 180 degrees by the active force, the plunger 39 and the lock tooth 40 are pulled up as shown in FIG. 6 and disengaged from the lock gear 32.
This state is the same as the state in which the solenoid 38 is driven when there is no failure. The operating screw 45 provided with the eccentric pin 46 constitutes an example of the manual means of the present invention.

In this embodiment, auxiliary pieces 10a and 11a are fitted into the first vise 6 and the second vise 8 , resin pipes a and b with small diameters are gripped to the first vise 6 and the second vise 8 , and the welded surfaces are The manner in which the end surfaces are heated and welded when the solenoid 38 and the like are in a protruding state and there is no failure in the solenoid 38 etc. will be described.

When heating the end face of a resin pipe, a T-shaped heater with heating plates on both sides is suspended between resin pipes a and b, the solenoid 38 is driven to release the lock, and the operating lever 9 is moved as shown in solid line in Figure 1. The shaft 26, the gear 27, and the intermediate gear 2 swing from the position to the chain line position.
8 to rotate the shaft 23. At this time, the engagement between the pinion 24 and the rack 19 causes the sleeve 18 to advance to the left in FIG. 2 vise 8 and resin pipe b
Move to the left. After the resin pipe a of the first vise 6 and the resin pipe b of the second vise 8 come into contact with both sides of the heating plate, the mantle 18 compresses the pressure detection spring 22 and moves to the left, and the resin pipe a, Increase the pressure applied to the heating plate in b. Finally, the push button 29a of the locking switch 29 is pressed by the sleeve 18.
is pressed to electrically detect the pressure of the second vice 8 by compressing the pressure detection spring 22.

Since the solenoid 38 had been driven until then and had not pulled up the plunger 39 and the lock teeth 40 against the elasticity of the pressing spring 43 to lock the lock gear 32, the shaft 23 was moved when the operating lever 9 was operated. Rotate clockwise in Fig. 3 and pin 35
is moved to a position beyond the vertical line L to the right, the toggle spring 37 gives the lock gear 32 and the shaft 23 a tendency to rotate clockwise, and the frictional action of the braking device 35 causes the operating lever 9 to return to its original position by itself. Avoid returning to position. Also, lock switch 2
9 detects the pressure by the sleeve 18 as described above, the circuit of the solenoid 38 is opened to deactivate the solenoid 38, and the pressure spring 43 projects the lock tooth 40 together with the plunger 39 into the lock gear 32. When engaged, the second vise 8 , operating lever 9, etc. become immovable.

The heating time by pressing the resin pipes a and b against the heating plate is set by a timer (not shown).
When a certain heating time elapses, the circuit of the solenoid 38 is closed and driven by the timer, and the lock teeth 40 etc. are pulled up by the pressure spring 43 to release the lock. For this reason, the pressure detection spring 22 expands and causes the sleeve 18 to return until it hits the collar 16, but the lock gear 32 does not allow the operating lever 9 to return to its original position due to the aforementioned action of the braking device. The pressure of pipes a and b on the vessel is loosened to allow the vessel to be freely removed. Of course, this heating causes pressure detection spring 22
If this is done with the heated end face being compressed, there is a risk that the heated end surface may melt a little and flow, so after a short period of time after the above-mentioned lock has elapsed, the solenoid 38 is driven by a timer to release the lock, and the toggle spring 37, This is done by mechanically balancing the braking device 35 and the weight of the operating lever 9 located at the position indicated by the chain line, and the end of the heating time may be announced by a signal sound or the like.

After heating as described above, immediately remove the heater,
Rotate the operating lever 9 to the position indicated by the chain line in Figure 1,
The second vice 8 is further moved to the left by the engagement of the pinion 24 and the rack 19, and the resin pipes a,
Press the end faces of b. This pressure contact is performed by the sleeve 18 under compression of the pressure detection spring 22 in the same way as before, so the sleeve 18 moves on the protruding shaft 15 in the same manner as described above, and this movement causes the locking switch 29 to open. Push button 29a is pressed and welding is maintained by lock gear 32 with solenoid 39 not driven.
Pin 36 is rotated to the position shown in FIG. 3 to further strengthen the toggle action of toggle spring 37.

After this welding, a suitable air-cooling time is allowed, and the grip of the pipes a and b by the first and second vises 6 and 8 is released.

If you have no choice but to switch from automatic to manual mode due to a failure in the solenoid 38, etc., rotate the operating screw 45 by about 180 degrees to bring the eccentric pin 46 to the upper position as shown in Fig. 6, which will cause the plunger 39 and lock tooth 40 to is pushed up against the elasticity of the pressing spring 43, releasing the lock on the lock gear 32 even if the solenoid 38 is not driven, and preventing the lock gear 32 from moving accidentally in the system of the lock gear 32, including the operating lever 9. This is performed only by the braking device 35 that makes elastic contact with the friction plate 34.

During this manual operation, the lock switch 29
30 is not activated, the pressure required for heat pressure welding, welding pressure welding, etc. is applied manually by operating the operating lever 9. The time required for heating and the time required for pressure welding are determined using a stopwatch or the like using the automatic time values shown in the work table.

There are two types of resin pipe welders; one model connects pipes of different diameters by welding them to both ends of a short socket, and the other model welds a saddle pipe to the side of one pipe. No, the first
Some models also perform welding by moving the vise in the approach direction using respective operating levers, and the present invention can be applied to any of these models.

(Effects) When the solenoid 38 is not driven, the present invention advances the plunger 39 and the lock teeth 40, engages the lock gear 32 with the lock teeth 40, locks the operating lever 9, etc., and drives the solenoid 38. Regarding a resin pipe welder having a structure in which the lock tooth 40 is pushed away via the plunger 39 when the lock gear 32 and the operating lever 9 can be freely rotated,
Even if the solenoid 38 etc. is damaged due to transportation or the like and cannot be driven, the plunger 39 can be prevented from advancing by manual operation in the same way as when the solenoid 38 is driven by energization, so that the lock gear 32 is locked by the lock teeth 40. At this time, the operating lever 9 is free to rotate, and since welding is no longer possible if the operating lever 9 is free to rotate, a braking action is applied to press the friction plate 34 against the lock gear 32 by the elasticity of the spring 3. Due to the structure in which the device 35 is provided, the operating lever 9 does not rotate unnecessarily and can be operated only by human operation, and even if the solenoid 38 breaks down, the brake device 35 switches to manual locking and the welding is completed. The friction plate 34 of the braking device 35 absorbs the reaction shock when the handle 9 is manually pressed to release the pressure that presses the resin pipe, and the pipe is pulled in the direction of separation before it cools down naturally to prevent welding. Since undesirable reactionary movements such as peeling can be well prevented, manual welding that must be performed in unavoidable circumstances can be carried out safely.

[Brief explanation of the drawing]

The accompanying drawings show an embodiment of the present invention, in which Fig. 1 is a partially cutaway side view, Fig. 2 is a front view of the same, Fig. 3 is a side view of the lock gear 32 etc. seen from the front, and Fig. 4 is a side view of the same. The perspective view of the operating screw 45, FIGS. 5 and 6, are enlarged side views showing automatic and manual switching by the operating screw 45, and are partial views of FIG. 3. a, b...pipe, x, y...arrow, 1...machine, 6
...First vice, 8 ...Second vice, 9...Operation lever, 15...Protruding shaft, 18...Cannula, 19...Rack, 2
2... Pressure detection spring, 23... Shaft, 24... Pinion, 31... Lock casing, 32... Lock gear, 33... Spring, 34... Friction plate, 35... Braking device, 38... Solenoid, 39... Plunger, 40
...Lock tooth, 43...Press spring, 44...Cover, 4
5...Operation screw, 46...Eccentric pin.

Claims (1)

[Claims] 1. A first vise that releasably grips a resin pipe or resin socket pipe on one side, and a second vise that releasably grips a resin pipe or resin saddle pipe on the other side. The vise may be fixed in position or both vises may be slidable and installed on the machine base, and there is also a swing lever that controls the pressure welding of the welding surfaces of the pipes on both sides, and a lock that rotates in conjunction with the operation of the operating lever. A gear and a lock tooth whose engagement and separation with the lock gear are controlled by a plunger that advances when the solenoid is not driven and retreats when the solenoid is driven are provided, and the two vises are moved relatively close to each other by an operating lever. In a resin pipe welder that moves and joins the welding surfaces of pipes on both sides, a solenoid is deactivated and a lock tooth is engaged with a lock gear to automatically lock the weld. Automatic/manual switching of a locking device for a resin pipe welder, characterized in that it is provided with a braking device that presses a friction plate by a brake, and a manual means that manually locks the plunger so that it cannot advance and unlocks the locking gear. Device.