JP2568162B2 - Device for processing valve seats such as gate valves and check valves - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is designed to remove defective valve seats by cutting and removing a defective valve seat with a sluice valve or a check valve installed in a piping system of a power plant or the like still connected to the piping. The present invention relates to a valve seat processing device such as a sluice valve and a check valve, which is designed to finish a welded portion of a valve seat.

[0002]

2. Description of the Related Art Conventionally, a sluice valve or a check valve installed in a piping system of a power plant or the like has a valve seat ring formed by welding a valve seat ring made of a hard metal material in a valve box in a substantially vertical direction. However, in actual use, the valve seat seat surface is easily damaged. To replace this valve seat, remove the entire valve from the piping, then take it back to a specialized factory and use a lathe, boring device (boring jig), etc. to remove the defective valve from the valve seat mounting part of the valve box. After removing the seat ring and fitting and welding a new valve seat ring to the portion, the welded portion is finished by the boring device or the like described above.

[0003]

However, when the valve is brought back to the factory and the valve seat is replaced, not only the repair cost is significantly increased, but also the delivery time of the repaired product is delayed, which causes the line to be replaced. There is a strong demand from the user side especially to replace the valve seat on-site because the suspension period will be long.

However, since a general boring machine conventionally used in factories and the like inserts a bite from the inlet or outlet of the valve box and supports and rotates the valve box itself with a positioner, Even if the device is used in the field, the valve box must be separated from the piping, which requires a great deal of work, and the device itself is large and heavy, which makes installation on the site a lot. There was a problem to be solved.

[0005]

In order to solve the above problems, the present invention connects the lower end of the main spindle and the back surface of the face plate with a bevel gear, and is installed so as to be expandable and contractible in the radial direction of the face plate. A bite adjusting shaft is screwed into a holder of a bite, the adjusting shaft and the bite spindle rotatably inserted in the main spindle are connected by a miter gear, and the main spindle is rotated by a motor,
This motor rotates the bite spindle through a differential mechanism, and adjusts the reduction ratio of this differential mechanism.
The main spin is installed when the adjustment mechanism is inoperative.
The first from the dollar to the face panel 1 reduction ratio main spindle Karaba
Second to the miter gear in the axial direction of the face plate that meshes with the gear adjustment shaft
While setting so as to match the reduction ratio, a spindle case fitted on the main spindle is supported by a base that can be attached to the upper edge of the valve box, and a face plate provided below the spindle case is moved by a moving mechanism. Can be moved horizontally
We adopted the means of configuring .

Further, a worm shaft for driving a bite spindle and a clutch shaft arranged in parallel with the shaft can be interlocked with each other, large and small bevel gears are mounted on the clutch shaft, and a gear is mounted on a drive shaft of a motor installed above the clutch shaft. A means for electrically activating the bite feed mechanism by arranging the support shafts in parallel through the shafts and selectively engaging the bevel gears attached to the lower ends of the shafts with the large and small bevel gears is also adopted.

[0007]

In the processing apparatus of the present invention, the tip of the cutting tool can be exposed to the cutting position by inserting the face plate inside the valve box that is still installed in the piping system and moving the face plate horizontally. can Ru. Then, the motor rotates the main spindle.
Cutting is done by turning and turning the face plate. On the spot
If the adjustment mechanism is not activated, the first reduction ratio will decrease by the second.
Since it matches the speed ratio, the surface that meshes with the face plate and bite adjustment shaft
There should be no difference in rotation between the miter gear in the board axis direction.
The tool bit adjustment axis does not rotate and the tool bit is not fed.
Yes. On the other hand, when the adjustment mechanism is operated, the reduction ratio of the differential mechanism
However, there is an imbalance between the first reduction ratio and the second reduction ratio.
Therefore, there will be a rotation difference between the face plate and the miter gear.
Byte adjusting shaft is rotating Te, exhibits the effect of bytes feed Ru performed.

Further, the one in which the bite feeding mechanism is electrically operated is
By selectively driving the large and small bevel gears provided on the clutch shaft, the tool is automatically fed and retracted via the tool spindle.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below in more detail with reference to one embodiment. In FIG. 1 to FIG. 4, 1 is a base that can be fixed to a flange (F) at the upper end of the valve box (B), Reference numeral 2 is a spindle case which is supported by penetrating the base 1, and 3 is a horizontal screw rod of a moving mechanism which enables the spindle case to move in the horizontal direction, that is, the Y direction in FIG. 2, and the handle 4 is attached to the base end side thereof. , This part through the horizontal bearing 5 to the base 1
It is rotatably supported by the screw case 6 and can be screwed into a screw cylinder 6 that is horizontally provided on one side of the spindle case 2. Further, 7 is a main spindle inserted in the spindle case 2, 8 is a rotatable bite spindle inserted in the central axis direction of the main spindle 7, and 9 is an idle shaft 1.
Bevel gear 1 fixed to the rear surface of the main spindle 7 and the lower surface of the main spindle 7 so that they can mesh with each other.
It is made rotatable through 1 · 11 ′. 1 more
Reference numeral 2 is a bite, 13 is a bite holder that is provided so as to be slidable in the front radial direction of the face plate 9, and 14 is a bite adjusting shaft that is rotatable in the axial direction. . In 15a · 15b · 15c are respectively attached to the center side of the byte adjusting shaft 14 to both ends and facing the lower end and idle shaft 10 byte spindle 8 Maitagiya, the rotation of the byte spindle 8 to the surface plate side
To communicate .

Further, FIG. 5 is an enlarged view of the inside of the gear case 16 provided at the upper end of the spindle.
Reference numeral 17 denotes a worm gear connected to a motor (not shown), which allows the main spindle 7 to rotate at a speed of 16 to 31 rpm via a worm wheel 17 '.
18 is a worm wheel, a bite handle 19
Is rotated by a manual worm shaft 20 connected to
It 25a is a marker fixed to the worm wheel 18
Iter gear, which is the worm wheel 18 and
The miter gear 25a is opposed to the shaft 21a passing through them.
And is slidable. This shaft 21a has a spaghetti
The sprockets 21 are fixed and the spur gears 21
It meshes with the spur gear 21 'fixed to the spindle 8.
It On the other hand, 22 is a spa fixed to the main spindle 7.
Gear, 23 is a reduction gear 24 meshing with this spur gear
Of the miter gear 2.
5b is fixed. 25c is a miter gear
Each of the bearing shafts is fixed to the shaft 21a .
And is configured to revolve around the shaft 21a.
The miter gears 25a and 25b.
They are in mesh with each other. In the above configuration, the miter
-By the gears 25a, 25b, 25c and the shaft 21a,
It constitutes the dynamic mechanism. In addition, the bite handle 19,
A differential gear with a home shaft 20 and a worm wheel 18.
It constitutes an adjusting mechanism for adjusting the speed reduction ratio of the structure.

When the adjusting mechanism is inoperative, the
The first reduction ratio R1 from the in-spindle 7 to the face plate 9
Face plate shaft that meshes with the tool adjusting shaft 14 from the spindle 7
The second reduction ratio R2 to the miter gear 15b in the same direction
Is set. The first reduction ratio R1 is a bevel gear
The reduction ratio from 11 to the bevel gear 11 ', the second reduction
Ratio R2 is deceleration from spur gear 22 to spur gear 24
Ratio ra and the shaft from the miter gear 25b in the differential mechanism
21a and the reduction ratio rb to the spur gear 21
The gear ratio rc to the gear 21 'and from the miter gear 15a
It is the product of the reduction gear ratio rd to the gear 15b. Specifically the number
In terms of values, for example, the first reduction ratio R1 is 1/5
2 reduction ratio R2, ra is 2/5, rb is 1/2, rc is
Since it is 1/1 and rd is 1/1, it becomes 1/5
It corresponds to the first reduction ratio R1. Incidentally, reference numeral 27 in the figure denotes a bearing fitted to each spindle or shaft.

[0012] Next, the usage procedure and function of the processing apparatus of the present invention will be described. When removing the defective valve seat (S) of Fig. 1, first, the bonnet such as a sluice valve which is still attached to the piping of the power plant or the like is removed. Remove and insert the face plate 9 in which the cutting tool 12 consisting of the blade point tool and the parting tool is set in the tool holder 13 in advance into the valve box (B), and the base 1 is placed and fixed on the flange (F). . After that, the center positions of the face plate 9 and the valve seat ring (S) are aligned with each other, and the bite 12
After confirming that the tip of the rod does not project, the horizontal screw rod 3 supported by the base 1 is rotated by the handle, and the screw cylinder 6 screwed with the screw rod is fixed to the spindle case 2. Since it moves in the direction, the tip of the cutting tool 12 reaches the joint between the valve seat (S) and the valve box (B). At this point, the rotation of the horizontal screw rod 3 is stopped and the cutting tool 1
Make the tip of 2 face the cutting position.

When the motor is subsequently driven, the main spindle 7 is moved through the worm gear wheel 17 17 '.
Rotates, and the face plate 9 is decelerated at the first reduction ratio R1 through the bevel gears 11 and 11 'provided below the spindle.
It rotates at a constant speed and is attached to the valve seat by the bite 12.
The welded portion between the gear and the valve seat (S) is cut. on the other hand,
The main spindle 7 is rotated by the spur gears 22 and 24,
Bite gear through differential mechanism and spur gears 21 and 21 '
It is transmitted to the pindle 8 and further transmitted to the miter gear 15b.
Adjustment mechanism unless turning the bite handle 19
Is inactive and the reduction ratio of the differential mechanism does not change,
The second reduction ratio R2, which is a series of reduction ratios during this period, is
It is equal to 1 reduction ratio R1. Therefore, the face plate 9 and the miter gear 1
There is no difference in rotation between the miter gear 1 and
Whether 5c does not rotate and the bite adjustment shaft 14 does not rotate
Byte transfer is not performed.

On the other hand, turning the bite handle 19 adjusts the machine.
When the structure is operated, the reduction ratio of the differential mechanism changes, and the first deceleration
Is there an imbalance between the ratio R1 and the second reduction ratio R2?
The rotation difference between the face plate 9 and the miter gear 15b.
Then, the miter gear 15c rotates and the bite adjustment shaft 14 rotates.
FIG. 3 shows the bite holder 13 that rolls and is screwed into the adjusting shaft 14.
The direction of arrow A is moved to the outer peripheral side to perform the bite feed,
Cutting of welded part of valve seat attachment part and valve seat (S) progresses
It When this cutting work is completed, the bite handle 19 is rotated in the reverse direction to pull back the bite 12 toward the center side, the rotation of the motor is stopped, and then the lateral screw rod 3 is reversed to retract the entire device and the device is valved. After removing it from the box (B), the cut valve seat ring is removed.

Next, the valve seat ring newly fitted to the above-mentioned valve box is welded by using an appropriate welding device, and this time, the cutting tool 12 for chamfering is set in the cutting tool holder 13, and the above-mentioned cutting step is carried out. The welded portion of the valve seat (S) is cut again in the same procedure as described above.

FIG. 6 shows an example of a bite-feeding electric mechanism, that is, a mechanism in which the worm shaft 20 for driving the bite spindle is rotated by a motor. The worm shaft 20 and a clutch shaft 31 provided in parallel thereabove. And spur gear 32
32 'is made to be interlockable, and large and small bevel gears 33 and 34 are fixed to the clutch shaft, while the gear case 16
The bevel gear 33 'attached to the lower end of the drive shaft 36 of the motor 35 installed on the upper end of the motor 35 meshes with the large-diameter side bevel gear 33 of the clutch shaft 31, and also interlocks via the drive shaft 36 and the spur gears 37 and 37'. The bevel gear 34 ′ attached to the tip of the support shaft 38 is configured to mesh with the small diameter bevel gear 34 of the clutch shaft 31.

When the bite 12 is to be projected by the bite feeding mechanism, the clutch shaft 31 can be engaged by engaging the larger bevel gears 33, 33 'connected to the drive shaft 36 and the clutch shaft 31 by switching the clutch.
Since the rotation of the tool is reduced and the tool spindle 8 also rotates at a low speed, the tool 12 is gradually projected and there is no risk of damaging the cutting edge. On the other hand, when retracting the tip of the cutting tool 12, the smaller bevel gears 34, 34 'connected to the support shaft 38 and the clutch shaft rotating in the opposite direction to the drive shaft 36 via the spur gears 37, 37'. When the clutch is engaged with the clutch shaft 31, the clutch shaft 31 quickly rotates in the reverse direction, and the tip of the cutting tool can be immediately pulled back.

Incidentally, the feed mechanism of the cutting tool may be, for example, a mechanism using a planetary gear mechanism other than the mechanism described above, and the structure thereof is not particularly limited.

[0019]

As described above, in the valve seat machining apparatus of the present invention, the face plate inserted into the valve box is movable, and the face plate is rotated by the main spindle .
Even when rotating, the bite attached to the face plate can be moved in the radial direction via the bite spindle, so that the valve box installed in the piping system of the power plant etc. can be used without removing it. It is possible to cut and remove the valve seat that has become defective in the state, and to finish the newly welded valve seat. Therefore, when replacing the valve seat, it is not necessary to bring the valve back to a specialized factory as in the past, so the cost of repair is low and the delivery time of the repaired product is accelerated, and the period of suspension of the piping system is greatly shortened. Of.

Further, the processing apparatus of the present invention is more compact than the conventional boring apparatus and is extremely simple to use on site.

In addition to the above, those equipped with an electric bite feed mechanism are capable of smoothly ejecting the bite without requiring skill, such that the bite can be gradually protruded by switching the switch or can be quickly retracted. It has excellent effects such as being able to do it.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing a usage state of a device of the present invention,

FIG. 2 is a longitudinal section of the device,

FIG. 3 is a front view of a face plate,

FIG. 4 is a bottom view of the face plate,

FIG. 5 is a sectional view of a gear case,

FIG. 6 is a cross-sectional view of an electric bite feeding mechanism.

[Explanation of symbols]

 1 Base 2 Spindle 7 Main Spindle 8 Bit Spindle 9 Face Plate 11 Bevel Gear 12 Bit 13 Bit Holder 13 Miter Gear 16 Gear Case 23 Reduction Shaft 25 Miter Gear 26 Differential Shaft 31 Clutch Shaft 35 Motor 36 Drive Shaft

Claims (2)

(57) [Claims] 1. A lower end of a main spindle and a rear surface of a face plate are connected by a bevel gear, and a bite adjusting shaft is screwed into a holder of a bite that is arranged so as to be expandable and contractable in a radial direction of the face plate, and the adjusting shaft is connected to the adjustment shaft. The bite spindle rotatably inserted in the main spindle is connected by a miter gear, and the main spindle is rotated by a motor.
The bite spindle is rotated via a differential mechanism by
And an adjustment mechanism for adjusting the reduction ratio of this differential mechanism is provided.
When the above adjustment mechanism is inactive,
The first reduction ratio to the panel is from the main spindle to the bite adjustment axis
The second reduction ratio to the miter gear in the axial direction of the face plate that meshes with the
On the other hand, the spindle case fitted to the main spindle is supported on the base that can be attached to the upper edge of the valve box, and the face plate provided below the spindle case is moved horizontally by the moving mechanism. A device for processing valve seats such as sluice valves and check valves, which is configured to be movable. 2. A worm shaft for driving a bite spindle and a clutch shaft arranged in parallel with the shaft can be interlocked with each other, and large and small bevel gears are attached to the clutch shaft, and a gear is mounted on a drive shaft of a motor installed above the bevel gear. The sluice valve according to claim 1, further comprising a support shaft arranged in parallel through a shaft, and a bite feed mechanism capable of selectively engaging a bevel gear attached to a lower end of each shaft with the large and small bevel gears.・ Valve seat processing equipment such as check valves.