JPH03221B2 - - Google Patents

Abstract

PURPOSE:To make adjusting easily the pressure of the pressure adjusting spring possible, by setting a screw shaft projected on a vice and a knob on a projected end of the screw shaft to fit it to the end surface of the pressure shaft, by setting a spring holder and a pressure adjusting spring and by setting a pressure scale on the outer surface of the spring holder. CONSTITUTION:When resin pipes of large diameters a, b are welded, the switch 29 does not work even if a thimble contacts it. After the switch 30 enlarges the compressed amt. of the pressure adjusting spring 22 by means of a pressure shaft 18, the shaft 18 contacts with a press button 30 a. Namely, the pressure changes depending upon the difference in the diameters of the pipes a, b. The stretched/compressed amt. of the pressure adjusting spring 22 can be easily adjusted and the adjusted state can be easily kept. The adjustment increases the spring pressure in accordance with the initial torque the long resin pipe a has. Namely, the pressure shaft is adjusted in such a manner that the extreme point should coincide with the right end of the pressure scale M of the spring holder 21 and the pressure adjustment is thereby given when no initial torque of the pipe a exists. The end surface of a pressing screw 46 whose outer side is extended contacts under pressure with the part where the spring holder 21 fits to the screw shaft 15 to prevent unnecessary rotation.

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 provided on the machine base, with one vise fixed in position, or both vises slidably movable, and the pipes on both sides welded together. In a resin pipe welder equipped with a swing lever for controlling the pressure welding of a surface to a heating plate and the pressure welding of a welding surface excluding the heating plate, the pressure of the resin pipe heater or the resin pipe welding can be easily adjusted. This relates to a device that allows settings to be made.

(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. 11, but the resin pipes are welded to the resin socket pipe as shown in Fig. 12. As shown in the figure, the ends are fitted together, and there are types that allow both the first and second vises to slide, or types that allow one of them to slide. Since the sliding movement is performed by an operating lever, there may be one or two levers. 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 Invention) Resin pipes are welded as described above, but the pipe, which has become long by repeatedly welding end faces to each other, is gripped by a vise on the slidable side. When installing, the long pipe protrudes diagonally from the vise,
When the vise is subjected to resistance or weight caused by rubbing against the ground, etc., and the sliding side vise is slid by operating the control lever, the action of returning the control lever to its original position works to reduce the sliding resistance of the pipe. Become. (The resistance of such a pipe is called the initial torque). Therefore, after joining the welding surfaces of the pipes with the control bar, the set pressure of the pressure spring used to press the welding surfaces by operating the control lever in the same direction will not be reduced by the initial torque. There are some issues that need to be resolved.

(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 on one side, and a resin pipe on the other side. Alternatively, a second vise that releasably grips the resin socket pipe is installed on the machine base, with one vise fixed in position, or both vices movable forward, and a heating plate on the welding surfaces of the pipes on both sides. In a resin pipe welder equipped with a swinging lever for controlling the pressure welding of the welding surface and the pressure welding of the welding surface excluding the heating plate, one or both of the slidable vices are attached to the rear side in the forward sliding direction. A screw shaft protruding from the top is provided, and a cylindrical adjustable spring receiver is screwed onto the screw shaft, and a sleeve-shaped pressurizing shaft that can freely slide and fits externally also in a part of the spring receiver is provided on the screw shaft. , a pressure adjustment spring is provided which engages with the end surface of the pressure shaft in the knob provided on the protruding end of the screw shaft, and has both ends in contact with the spring receiver and the pressure shaft; A pressure scale is provided on the outer circumferential surface to be fitted, and by simply rotating the screw shaft with a knob, the above-mentioned initial torque is applied to the vise by approaching the cannula-shaped pressure shaft while looking at the scale on the spring receiver. The pressure of the pressure adjustment spring can be easily adjusted to prevent this from happening.

(Function) The present invention provides a rotatable screw shaft that protrudes rearward in the forward direction of a sliding vise, and a spring receiver that enables axial position adjustment is screwed onto the screw shaft. and a sleeve-shaped pressure shaft that can freely slide, a part of which is fitted onto the spring receiver, and a pressure adjustment spring whose both ends are joined to the spring receiver and the pressure shaft. A pressure adjustment scale is provided on the outer circumferential surface of the spring receiver that is fitted onto the outside, and the screw shaft is gently rotated by the knob on the protruding end of the screw shaft, and the pressure is adjusted by moving the spring receiver so that the pressure scale matches the tip of the sleeve. When compressing a spring and trying to move a slidable vise closer to another vise, the spring pressure of the pressure adjustment spring is increased by the initial torque of the pipe that acts as a sliding resistance on that vise. After setting the adjustment, operate the operating lever to move the vise forward, press the pipe to the heating plate, and press the welding surface after removing the heating plate using the set pressure. The vise and operating lever on the possible side are prevented from returning due to the initial torque of the long pipe, and the welding surface can be pressed with almost the same pressure as when gripping a short pipe.

(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 which releasably grips the pipe a, and a slidable second vise 7 which releasably grips a resin pipe b having the same diameter as the pipe a is provided on the other side.
This is an example of a welder which welds the end surfaces of pipes a and b by moving the second vise closer to the first vise 6 using the operating lever 9.

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 to each other, 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 whose one end is pivotally supported on the fixed piece and swings in the direction of arrow x in FIG. 2, and a shaft 14 on the lower end. is pivoted on the fixed piece 10, and the arrow y in Fig. 2 is
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.
The screw shaft 1 is slidably fitted onto a part of the rear end.
5, the pressure adjustment spring 22 is loosely wound around the screw shaft 15 in the large diameter hole 20, and both ends of the pressure adjustment spring 22 are connected to the spring receiver 21 and the pressure shaft 18. A ninth,
A pressure scale M is provided as shown in Figure 10. The pressure shaft 18 is pressed against the knob 17 by the elasticity of the pressure adjustment spring 22 with the operating lever 9 in the non-operating position as shown by the solid line in FIG. 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, which engages with the rack is fixed, is passed through the insertion hole 3b and supported. The shaft 23 is provided with a small gear 25 at one end, and the other end is passed through a lock casing 31 attached to the support column 3. 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 buttons 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 disc 35 is fixed to the shaft 23 coaxially with the lock gear 32, and a shock absorber 36 is attached so as to protrude outside of the lock casing 31.
The shaft 36a of the cam disk 35 is brought into contact with the circumferential surface of the cam disk 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 buttons 29a, 31a of the locking switch 29 or 30 are pushed in the right angle direction by the sleeve 18 as shown in FIG. The above lock is solenoid 37
It is released by driving.

In this embodiment, the auxiliary pieces 10b and 11b are fitted, a long resin pipe a with a small diameter and hanging obliquely from the vise is gripped in the first vise 6, and a pipe b of normal length is attached to the second vise. 7, and the welding surfaces are aligned by cutting and are in a protruding state, the manner in which the end surfaces are heated and welded will be described.

When heating the end face of a resin pipe, a T-shaped heater 51 with heating plates 52 on both sides is used as shown in FIG.
is suspended between resin pipes a and b of the first vise 6 and second vise 7, and the operating lever 9 is swung from the position shown by the solid line in FIG. 1 to the position shown by the chain line (), and the shaft 2
6. Rotate the shaft 23 via the gear 27 and intermediate gear 28. However, the pressure shaft 18 moves to the left in FIG. 1 due to the rack mechanism formed by the meshing of the pinion 24 and the rack 19, and the pressure adjustment spring 22 is moved between the spring shaft 15 and the second vise via the spring receiver 21 with almost no compression. 7 and the resin pipe b to the left. After the resin pipe a of the first vise 6 and the resin pipe b of the second vise 7 come into contact with both sides of the heating plate 52, the pressure shaft 18 compresses the pressure adjustment spring 22 as shown in FIG. move,
Strengthen the pressure against the heating plate 52. Finally, the locking switch 2 is activated by the pressure shaft 18.
9 is pressed 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 detected.

Since 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, the shaft 23 was moved when the operating lever 9 was operated. 4, the locking switch 29 is pushed in the right angle direction by the pressure shaft 18 as described above to detect pressure, and at the same time opens the circuit of the 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 heating time by pressing the resin pipes a and b against the heating plate 52 is set by a timer (not shown), and when a certain heating time elapses, the circuit of the solenoid 37 is closed and driven by the timer, and the lock tooth 39 is activated. etc. are pulled up by the pressing spring 43 to release the lock. For this reason, the pressure adjustment spring 22
extends and causes the pressure shaft 18 to return until it hits the knob 17 as shown in FIG. 6, but at that time the cam disc 35 is attached to the shaft 23 at the angle shown in FIG. Shock absorber 3
The shaft element 36a of the cam disc 35 comes into contact with the circumferential surface of the cam disk 35 near the shaft element 23 and acts to prevent rotation in the direction of the arrow z, and the friction brake device 34 also acts, so that the operating lever 9 did not return to its original position,
The pressure of the resin pipes a and b against the heater 51 by the pressure adjustment spring 22 is gradually loosened, and the heater 51 can be freely removed. Of course, this heating can only be done by pressing the resin pipes a and b against the heating plate 52, and if the pressure welding is carried out with the pressure adjustment spring 22 being compressed due to the aforementioned lock, there is a risk that the heated end surfaces may melt a little and flow. After a short period of time has elapsed, the solenoid 37 is driven by a timer to release the lock.

After the heating described above, quickly remove the heater 51, rotate the operating lever 9 to the position indicated by the chain line () in FIG. to press the end surfaces of resin pipes a and b together. This pressure contact is carried out by the pressure adjustment spring 2 by the pressure shaft 18 in the same way as above.
2, the shaft 18 moves on the spring shaft 15 in the same way as before, and with this movement presses the push button 29a of the locking switch 29,
The solenoid 37 is deactivated to create a lock and maintain the weld.

At this time, the cam disk 35 rotates slightly more clockwise than in FIG.

The welding retention time is set by a timer (not shown), and as soon as the time elapses, solenoid 3 is activated.
7 to release the lock. As a result of this release, the pressure adjustment spring 22 expands in the same way as before, and the pressure shaft 18 only hits the knob 17, without returning the operating lever 9 and the second vise 7 to their original positions. The welded surfaces a and b can only be loosened from pressure, and the force in the pulling direction does not work to separate the end surfaces, so the welding is not weakened.

After this welding, a suitable air-cooling period is allowed, and the grips of the pipes a and b by the first and second vises 6 and 7 are released, and then the operating lever 9 is returned to the solid line position in FIG. 1.

As mentioned above, when welding the large diameter resin pipes a and b, the circuit is changed by the switch 30, and the switch 29 does not work at all even if the sleeves come into contact with each other. The switch 30 is a pressure adjusting spring 2
After the compression amount of 2 is increased by the pressure shaft 18, the shaft 18 contacts the push button 30a.
That is, the pressure changes depending on the difference in diameter between pipes a and b.

In the above, in both heating and welding, if the pressure detection signal is output from the locking switch 29 or 30 immediately after the pressure shaft 18 compresses the pressure adjustment spring 22, the position difference between heating and welding ( In Figure 1, the operating lever positions (), () are shown.
It is preferable to cause a slight time delay in generating the signals of the switches 29 and 30, since this may cause the lock to occur early regardless of the position difference between the switches 29 and 30. In other words, the operator does not release his hand immediately after moving the operating lever 29 to the positions () and (), but rather releases his hand after confirming that it is locked by the aforementioned slow movement.

The present invention can be applied to any type of welding machine shown in Figs. 11 and 12.

In this embodiment, the amount of expansion and contraction of the compression adjustment spring 22 can be easily adjusted and the adjusted state can be maintained. This adjustment increases the spring pressure in accordance with the initial torque that the long resin pipe a has. That is, the pressure shaft 18 is adjusted so that its tip coincides with the right end of the pressure scale M of the spring receiver 21, as shown in FIG. 9, to adjust the pressure when the pipe a has no initial torque. The end face of a retaining screw 46 having an elongated outer side is pressed against the portion of the receiver 21 that is screwed into the screw shaft 15 to prevent unnecessary rotation.

In order to adjust the pressure of the second vise 7 in accordance with the initial torque when the pipe a has become longer due to welding of the end faces to each other and is generating the above-mentioned initial torque, loosen the pressure of the cap screw 46 against the screw shaft 15. , the screw shaft 15 is rotated by the knob 17. At that time, the threaded portion of the spring receiver 21 with the screw shaft 15 becomes the first
It moves to the right in the figure and moves a part of the pressure scale M into the large diameter hole 20 of the pressure shaft 18 as shown in FIG. 10, thereby compressing the pressure adjustment spring 20. At this time, the distance L between the tip of the pressure shaft 18 and the push buttons 29a, 30a of the lock switch 29 or 30 does not change at all, as is clear from a comparison between FIGS. 9 and 10. After making the above adjustment, the retaining screw 46 is tightened to fix the screw shaft 15 and the spring receiver 21.

(Effects) As clarified by the description of the above embodiment, the present invention allows the pinion 24, which rotates by operating the operating lever 9, to be rotated from a vise so that it can freely slide onto the screw shaft 15 that protrudes. Pressure shaft 18 that is fitted and engaged by a knob on the protruding rear end of the shaft 15
A spring receiver 21 constitutes a rack mechanism that engages a rack 19 provided in the spring, and has one end screwed onto the screw shaft 15
The pressure adjusting spring 22, which is applied to the pressurizing shaft 18 at one end, is compressed at the end of the vise movement by the operation of the operating lever 9 to detect the increase in vise pressure that occurs during heating or welding.
A lock gear 32 is attached to the shaft 23 of the pinion 24.
is installed and the solenoid 37 is deactivated by detecting the pressure set in the pressure adjustment spring 22.
The operating lever 9 is locked by the lock teeth 39 corresponding to the lock gear 32, which in turn locks the vice, and the screw shaft 15
A knob 17 is provided at the protruding rear end of the knob 17 and is brought into contact with the pressure shaft 18 by the elasticity of the pressure adjustment spring 22.
is rotated only when necessary to move the spring receiver 21 in the direction of the pressure shaft 18, thereby increasing the compression of the pressure adjustment spring 22 to a pressure that counters the initial torque of the longer pipe a. Therefore, even if one of the resin pipes becomes long, the resin pipe welder can be used with a desired pressure setting by simple operation, and the range of use of the welder can be easily expanded.

[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 line A-A in Fig. 3. Figure 5 is a front view taken along the line B-B in Figure 3, Figures 6 and 7 are side views illustrating the operation of the pressure shaft 18, and Figure 8
The figure is a side view of the heater 51, Figures 9 and 10 are plan views showing the pressure adjustment spring 22 before and after pressure adjustment, and Figures 11 to 13 are longitudinal sectional views showing the types of pipe bonding. . 1... Machine base, 6... First vice, 7... Second vice,
8...Mounting part, 9...Operation lever, 15...Screw shaft, 1
7...knob, 18...pressure shaft, 19...rack,
21... Spring receiver, 22... Pressure adjustment spring, 23... Terminal, 24... Pinion, 32... Lock gear, 37...
Solenoid, 39...lock tooth, M...scale, 46...
Holder screw.

Claims (1)

[Claims] 1 The first part that releasably grips the resin pipe on one side.
A vise and a second vise that releasably grips the resin pipe or resin socket pipe on the other side are installed on the machine base, with one vise fixed in position, or both vises movable forward. In a resin pipe welder comprising a swing lever for controlling the pressure welding of the welding surface of the pipe to the heating plate and the pressure welding of the welding surface excluding the heating plate, one or both of the above-mentioned slidable The vise is provided with a screw shaft that protrudes rearward in the forward sliding direction, and a cylindrical spring receiver is screwed onto the screw shaft, and a sleeve-shaped sleeve that can freely slide is fitted onto a part of the spring receiver. A pressure adjustment spring is provided, the knob is attached to the protruding end of the screw shaft and engages with the end surface of the pressure shaft, and both ends of the spring receiver and the pressure shaft are in contact with each other. , a pressure setting device for a resin pipe welder, which has a pressure scale on the outer circumferential surface on which the pressure shaft of the spring receiver fits.