JPH031145B2 - - Google Patents

Abstract

PURPOSE:To relax the shock produced by lock release, by engaging locking teeth to hold welding and by absorbing the returning rotation which is in the opposite direction of the pressed contact of the welding surface of an eccentric cam plate by the extending/compressing shaft of the shock absorber contacted with the circumference of the eccentric cam plate if an external force peeling the welding surface works when the lock is released in course of the required welding time. CONSTITUTION:Holding time of welding by pressed contact of the end surfaces of resin pipes a, b is set by a timer which starts when the circuit of a solenoid 37 is closed, and locking is released by pushing up lock teeth 39 by means of a pressing spring 43. A shaft piece 36 a of the shock absorber 36 contacts with the circumference surface close to a shaft piece 23 of an eccentric cam plate 35 to prevent the rotation to the arrow line, z direction. At the same time, a spring for setting pressure 22 suddenly extends to delay the rotating speed of the shaft piece 23 as a friction brake 34 works too. The rotation of a pinion, which moves with the shaft piece 23, to the clock direction is thereby delayed and the movement of the pressing shaft 18 which engages a rack 19 with the pinion 24 by means of extending elasticity of the spring for setting pressure 22 is delayed to absorb shock.

Description

Detailed Description of the Invention (Industrial Application Field) 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 slidably movable, and the pipe welding surfaces on both sides The welding surface of the pipes is welded using the operating lever, and the pressure welding is held by a lock by a locking mechanism, and as the welding time elapses, the lock is released and the welding is released. This invention relates to a damping device for a resin pipe welder that prevents one or both of the slidable vises from moving back too quickly due to the shock of the welding process, thereby disabling or weakening the weld.

(Prior art) The resin pipes to be gripped by the first and second vises are welded together at their end faces as shown in Fig. 7, but the resin pipes are welded to the resin socket pipe as shown in Fig. 8. The resin saddle pipe is welded to the resin pipe by fitting the ends together as shown in Fig. 9, and the resin saddle pipe is welded to the resin pipe in a T-shape on the side of the resin pipe as shown in Fig. 9. There are types that allow both the first and second vises to slide, or types that allow one of them to slide, and since the vise is slid by an operating lever, the lever is Sometimes it's one book, sometimes it's two books. However, there is no conventional technology similar to the present invention for resin pipe welders that perform such welding.

(Problems to be Solved by the Present Invention) Resin pipes are welded as described above, but the heated welding surface is pressed against the relative surface of one or both of the sliding vises. The approach is controlled by an operating lever, and at the end of the operation, a pressure setting spring is compressed, and welding is maintained by a locking mechanism to keep the welding pressure constant. However, after the welding time has elapsed, the lock is automatically released, but due to this release, the pressure setting spring is expanded, and one or both of the vises, which have been made slidable, move in the direction of separation along with the operating lever. However, if the moving speed is high, the weld on the welding surface will be separated, making the welding ineffective or weakening the welding force, which has the disadvantage that this must be solved rationally.

(Means for Solving the Problems) The present invention aims to solve the above problems, and includes a first vise that releasably grips a resin pipe or a resin socket pipe on one side, and A second vise that releasably grips the resin pipe or resin saddle pipe is installed on the machine frame with one vise fixed in position or both vises movable forward, and the welded surfaces of the pipes on both sides A lock gear that rotates in conjunction with the operation of the operating lever is provided on the machine frame, and the operating lever moves the two vises relatively close together, and the lock gear is interlocked. It rotates and presses the welded surfaces of the pipes on both sides, and the lock teeth engage the lock gear to lock it. At the same time, an eccentric cam plate is attached to the shaft that interlocks with the lock gear, and the lock is attached to the machine frame side. Bring the tip of the telescopic shaft of the installed shock absorber into contact with the circumferential surface of the eccentric cam plate, and bring the end surface of the telescopic shaft close to the shaft to which the eccentric cam plate is attached while pressing the adhesive surface of the pipes using the operating lever. When the pressure is released, the eccentric cam plate rotates in a direction to move the tip of the telescopic shaft away from the shaft, and the telescopic shaft of the shock absorber, which contacts the circumferential surface of the eccentric cam plate interlocked with the lock gear, moves in the retracting direction. In this case, the resin pipe welder utilizes a buffering function that absorbs the energy of the impact using hydraulic pressure or the like.

(Function) The present invention presses the end face of the telescopic shaft of the shock absorber against the circumferential surface of the eccentric cam plate that rotates together with the lock gear that is linked to the operation of the operating lever, and when the operating lever is set at the original position, the end face of the telescopic shaft When pressing against the circumferential surface of the eccentric cam plate that is far from the axis, and when one or both of the movable vises are approached by the operating lever and the heated welding surface of the pipe is pressed against the pressure setting spring, the eccentric cam plate causes the end face of the telescopic shaft to rotate closer to the shaft of the cam plate, and at the same time locks the lock gear, returns the slidable vise and the operating lever, and locks them so that they cannot rotate. At the same time, when the lock is automatically released and the slideable vise and operating lever are about to move back rapidly due to the release shock, the return rotation of the eccentric cam plate is slowed down by the buffering effect caused by the slow movement of the telescopic shaft. This buffering effect cools the welded parts by buffering the effect of rapidly separating the welded parts of the resin pipes gripped by the vise. If the weld is cooled before being peeled off, the weld strength will not deteriorate.

(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 7 is provided on the other side to releasably grip the resin pipe b having the same diameter as the pipe a.
is provided, and the second vise 7 is moved to the first position by the operation lever 9.
This is an example of a welder (see FIG. 7) 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.
and a column 3 on which an operating lever 9 is pivoted are provided in opposition, and a pair of front and rear round bar-shaped rails 4 has a mounting portion 8 of a second vise 7 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 7 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 indicated by the arrow 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 opposing semicircular arc grooves 10a and 11a for gripping pipes, and each groove has a semicircular auxiliary piece for gripping a small diameter pipe. 10b, 11b
It is designed so that it can be installed by fitting it in.

A screw shaft 15 protruding outward through the support column 3 is rotatably supported by a bracket 16 on the mounting portion 8 of the second vise 7, and a knob 17 is attached to the protruding end of the shaft 15.
Install.

A front end portion of a cylindrical spring receiver 21 is screwed into the front portion of the screw shaft 15 near the bracket 16. 1
8 is a large diameter hole 20 formed on the front end surface of the spring receiver 21.
A screw shaft 15 is slidably fitted onto a portion of the rear end.
The pressure setting spring 22 is loosely wound around the screw shaft 15 in the large diameter hole 20, and both ends of the pressure setting spring 22 are connected to the spring receiver 21 and the pressure shaft 18. Multiply. When the shaft 18 is in the non-operating position as shown by the solid line in FIG. 1, the knob (17)
(Figure 5). A rack 19 is formed on the lower surface of the pressure shaft 18 at a portion passing through the insertion hole 3a provided in the rearward protrusion of the support column 3.

An insertion hole 3b that crosses the lower side of the insertion hole 3a in the support 3
is provided as shown in FIG. 2, and a shaft 23 to which a pinion 24 is fixed, which meshes with the aforementioned rack, is passed through the insertion hole 3b and supported. The shaft 23 is provided with a small gear 25 at one end and passes through a lock casing 31 attached to the support column 3 at the other end. The operating lever 9 is fitted onto 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.

The pressure shaft 1 is attached to the mounting part 8 of the second vise 7.
Locking switches 29 and 30 with respective push leads 29a and 30a protruding are provided in parallel as shown in Figs. As shown in FIG.
A changeover switch (not shown) is provided which operates so that the circuit of the switch 29 is closed in relation to the engagement of the auxiliary pieces 10b and 11b, and the circuit of the switch 30 is closed in relation to the removal of the auxiliary pieces 10b and 11b.

Inside the lock casing 31, a lock gear 32 is fitted and fixed onto the shaft 23, and behind the lock gear 32, a friction brake device 34 is provided on the side of the casing 31, which presses against the lock gear 32 by the action of a spring 33.

An eccentric cam plate 35 is fixed to the shaft 26 coaxially with the lock gear 32, and a telescopic shaft 36a of a shock absorber 36 attached to project outside the lock casing 31 is brought into contact with the circumferential surface of the eccentric cam plate 35.

On the upper side of the lock gear 32, a plunger 38 which is attracted in the pulling direction when the solenoid 37 is driven is provided with lock teeth 39 that mesh with the lock gear 32.

The lock tooth 39 is attached to the transverse shaft 40 of the plunger 38 so as to be able to move slightly, and furthermore, the guide column 41 fixed to the tooth 39 is passed through the guide member 42 attached to the lock casing 31, and the guide column 41 is inserted between the guide column 41 and the guide member 42. A pressure spring 43 is provided which engages the lock tooth 39 with the lock gear 32 to lock it when the solenoid 37 is not driven. The solenoid 37 is connected to a circuit that is closed when the push leads 29a, 31a of the locking switch 29 or 30 are pushed in the right angle direction by the pressure shaft 18 as shown in FIG. The aforementioned lock is released by driving the solenoid 37.

In this embodiment, the auxiliary pieces 10b and 11b are fitted, and the small diameter resin pipes a and b are connected to the first vise 6.
and the second vise 7, and the pipes a and b on both sides.
A case will be described in which the welded surfaces of the welded surfaces are aligned by cutting and are heated and protruded.

Swing the operating lever 9 from the position shown by the solid line in FIG.
The shaft 23 is rotated through the. At this time, the pressure shaft 18 moves to the left in FIG. 1 using the rack mechanism formed by the meshing of the pinion 24 and the rack 19, and at this time, the pressure setting spring 22 is pushed against the spring shaft 15 via the spring receiver 21 without causing almost any compression. and move the second vise 7 and the resin pipe b to the left. After the heated end surfaces of the resin pipe a of the first vise 6 and the resin pipe b of the second vise 7 come into contact, the pressure shaft 18 compresses the pressure adjustment spring 22 as shown in FIG. 6 and moves it to the left. Move to increase pressure.
Finally, the push lead 29a of the locking switch 29 is pushed by the pressure shaft 18 as shown in the figure, and the pressure exerted on the second vise 7 due to the compression of the pressure adjustment spring 22 by the pressure shaft 18 is electrically reduced. To detect.

The solenoid 37 had been driven until then, and had not pulled up the plunger 38 and the lock teeth 39 against the elasticity of the pressing spring 43 to lock the lock gear 32, but with the operation of the operating lever 9, the shaft 23 Rotating clockwise in FIG. 3, the lotus switch 29 is pushed in the right angle direction by the pressure shaft 18 as described above and at the same time detects the pressure.
Open the circuit of solenoid 37 to deactivate it. Therefore, the lock tooth 39 projects together with the plunger 38 by the pressing spring 43 and engages with the lock gear 32, making the second vise 7, operating lever 9, etc. immovable.

The welding retention time due to pressure welding of the end surfaces of resin pipes a and b is set by a timer not shown.
When a certain welding time elapses, the circuit of the solenoid 37 is closed and driven by the timer, and the lock teeth 39 and the like are pulled up by the pressure spring 43 to release the lock. However, in that case, the eccentric cam plate 35 is attached to the shaft 23 at the angle shown in FIG. 4, and the shaft 36a of the shock absorber 36 is
comes in contact with the circumferential surface of the eccentric cam plate 35 near the shaft 23 and acts to prevent rotation in the direction of the arrow z, and the friction brake device 34 also acts, so that the pressure setting is stopped when the lock is released. Shaft 23 when spring 22 expands rapidly to return pressure shaft 18 until it hits knob 17 as shown in FIG.
delay the rotation speed of For this reason, the rotation of the pinion 24 interlocked with the shaft 23 in the clockwise direction in FIG. ease. Therefore, no sudden external force is applied to the welded surfaces of the resin pipes a and b, and during the slow motion, the welded surfaces are naturally cooled and strengthened, and the adhesive force increases as the pressure setting spring 22 expands. This acts as a resistance, and since a pulling force acts on the pipes a and b, and the welded surfaces are not pulled off, the welding is not weakened.

After this welding, a suitable air-cooling time is allowed, and the pipes a and b are released from the first and second vises 6 and 7, and then the operating lever 9 is returned to the position shown in solid line in FIG.

The present invention can be applied to any of the welding machines shown in FIGS. 7 to 9.

(Effects) As clarified by the description of the above embodiments, the present invention provides the following effects when welding is performed by pressing the welding surfaces of the resin pipes gripped by the first and second vices on both sides by operating the operating lever. When the lock teeth are engaged with the lock gear that is interlocked with the operating lever, the welding is maintained by the lock, and when the lock is released as the required time for welding has elapsed, the circumferential surface of the eccentric cam plate that is interlocked with the lock gear. The shock absorber's telescopic shaft in contact with the welded surface can buffer the return rotation of the eccentric cam plate, which is opposite to the pressure welding of the welded surface, even if an external force is applied to peel off the welded surface, and the shock caused by unlocking can be alleviated. can be made into a simple configuration by cooperating with an eccentric cam plate interlocked with a pinion and a shock absorber. According to the present invention, after welding the resin pipe, the external force that weakens the strength of the weld is reduced to the acting force that rotates the lock gear in the opposite direction. Even if it acts as a weld, it has the effect of buffering external forces until the strength is achieved by cooling, without invalidating the welding or weakening the strength.

[Brief explanation of the drawing]

The accompanying drawings show one 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 plan view, and Fig. 4 is a cross section taken along the line A-A in Fig. 3. Figure 5,
FIG. 6 is a cutaway side view explaining the operation of the pressure shaft 18, and FIGS. 7 to 9 are longitudinal sectional views showing the types of pipe bonding. 1 → Machine base, 6 → 1st vice, 7 → 2nd vice,
8→Mounting part, 9→Operation lever, 15→Screw shaft, 1
7 → knob, 18 → pressure shaft, 19 → rack,
23 → Shaft, 24 → Pinion, 32 → Lock gear, 35 → Eccentric cam plate, 36 → Shock absorber, 36a → Telescopic shaft, 37 → Solenoid, 39
→Lock teeth.

Claims (1)

[Claims] 1. A first vise that releasably grips the resin pipe or resin socket pipe on one side, and a second vise that releasably grips the resin pipe or resin saddle pipe on the other side, with one vise fixed in position, Alternatively, both vises can be slid forward and installed on the machine frame, and an operating lever is provided to control the pressure welding of the welded surfaces of the pipes on both sides, and a lock gear that rotates in conjunction with the operation of the operating lever is attached to the machine frame. The two vises are moved relatively close to each other by an operating lever, and the lock gears are rotated in conjunction with each other, so that the lock teeth are engaged with the lock gears in relation to pressing the welded surfaces of the pipes on both sides. At the same time, an eccentric cam plate is attached to the shaft that interlocks with the lock gear, the tip of the telescopic shaft of the shock absorber attached to the machine frame is brought into contact with the circumferential surface of the eccentric cam plate, and the operation lever is used to connect the pipes. The distal end surface of the telescopic shaft is brought close to the shaft on which the eccentric cam plate is attached while the adhesive surfaces are pressed together, and when the pressure contact is released, the eccentric cam plate rotates in a direction to move the distal end of the telescopic shaft away from the shaft. A shock absorber for resin pipe welders.