JPS5850141B2 - Pipe inner surface coating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for coating the inner surface of a pipe.

Traditionally, when painting the inside surface of a pipe (for example, a steel pipe), it has also been common to paint the outside surface at the same time. One common method is to dip the hepaibu.

However, this method not only requires a large-capacity paint bath, but also requires a very long conveying path for painting, which requires a large amount of space.

Of course, this method cannot be used if only the inner surface of the pipe needs to be painted.

Therefore, a method was proposed in which a preheated pipe is conveyed while lying horizontally, a thermoplastic powder coating is blown through an opening at one end of the pipe, and the powder coating is melted and adhered to the inner surface of the pipe to form a coating film. Sometimes.

However, in this case, the disadvantage was that unless the pipe was rotated, the coating film would have an uneven thickness.

The present invention aims to eliminate the drawbacks of the conventional methods as described above, and preferred embodiments of the present invention will be described below based on the attached illustrative drawings.

FIG. 1 shows the state in which the pipe is transported under suspension.

Reference numeral 1 denotes a suspended conveyance means, and the trolley 3 is guided by a conveyance rail 2 forming a conveyance path.The trolley 3 is connected and propelled by an endless chain 4.The trolley 3 has a chain 7.
5, an S-shaped hook 6, a hanging tool 7 whose middle part is made thinner for easy cutting, and an S-shaped hook 8 crabs, which are hung in this order.

As shown in FIGS. 1 and 2, in this embodiment, two pipes 9 are combined into a set and suspended from one trolley 3.

That is, a hanging jig 10 divided into two parts is attached near the upper end of each pipe 9, and the partition parts 11 of the hanging jig 10 are overlapped with each other so that the S-shaped hook 8 is penetrated and locked thereto.

FIG. 3 shows a part of the conveyance path along which the suspended conveyance means moves in conjunction with each other.

On the conveyance route, a suspension release location A, a painting location B1, and a suspension return location C are set in this order by distributing static distance delivery intervals.

The transport rail 2, on which the suspension transport means moves in conjunction, is lower at the suspension release location A, higher at the painting location B, and is lower at the suspension release location C than at the suspension release location A. It has been lowered further and is installed to maintain a steady conveyance height in the bushes.

A suspension release means 12 is provided at the suspension release location A.

FIG. 5 shows an enlarged view of the suspension release means 12 viewed from the front in the conveying direction.

The suspension release means 12 includes a fixed cutting blade 13 and a movable cutting blade 14, which are arranged to sandwich the moving path of the hanging tool 7 in the suspension conveyance means 1.

The fixed cutting blade 13 is fixed to the lower end of the portal machine frame 15, and the movable cutting blade 14 is fixed to the lower end of the movable arm 17 which is pivotally supported on the upper part of the portal machine frame 15 by a shaft 16 parallel to the transport rail 2. It is fixed.

The movable arm 17 includes a piston/cylinder unit 18
The movable arm 1F is connected by a link 21 to an elevating cart 20 that is driven up and down via a rod 19 connected to the movable arm 1F. It has become.

Therefore, the movable cutting blade 14 fixed to the lower end of the movable arm 17 acts on the fixed cutting blade 13 to cut the thin part of the hanging tool I positioned between the two cutting blades. It is configured.

In addition, as shown in Figure 2, at this suspension release location A, 22 asymmetric pipe guides are installed across the loading path, and the pipe guides are suspended in a state parallel to each other in the transverse direction with respect to the transport direction. The two pipes 9 that have been transported are brought into contact with the pipe guide 22 and turned so that they are lined up in series in the transport direction.

This conversion is accomplished by using the cheno 5 and S-shaped hook 6 shown in Figure 1.
．． This is done by a torsional movement between the 8 and the hanger 7.

Furthermore, the suspended conveyance of the pipe 9 by the suspended conveyance means 1 is as follows:
A plurality of pipes 9 (in this embodiment, there were two sets of four pipes in total as shown in FIGS. 6 and 7).

) The moths form a group and perform continuously, keeping an appropriate distance between each group.

When it is detected by the detection rod 23 shown in FIG. 1
4) Cut the hanging tool 7.

In this case, the cutting blades 13 and 14 are as shown in FIG.
The length is set such that the two hanging tools 7 from which two sets of four pipes 9 are suspended can be cut at the same time.

As shown in FIG. 3, between the suspension release location A, the painting location B, and the suspension return location C, there is a clamping and conveying means 2 that reciprocates therebetween.
There are 4 positions.

When viewed from the front with the clamping and conveying means 24 installed, the fourth
As shown in the figure.

8 is an enlarged side view of the holding and conveying means 24, and FIG. 9 is an enlarged front view.

The clamping and conveying means 24 includes a pair of carts 25 and 26 that are arranged to sandwich the pipe conveying path directly below the conveying rail 2, and pipe holding portions 27 are provided at both ends of the carrying-in side and the carrying-out side of both carts 25 and 26. .28 is provided.

The distance between the pipe holding parts 27 and 28 is equal to the length of the delivery interval distributed between the suspension release location A, the painting location B, and the suspension location C.

Each pipe holding part 27,28 is separated from a pipe upper support part 29 and a pipe lower clamping part 30.

Both carriages 25,26 are movable back and forth along a guide rail 31,32 via wheels 33,34 which each surround a guide rail 31,32, each of which has a cable cylinder 35.
It is caused to reciprocate by .degree.36.

As shown in FIGS. 6 and 9, the pipe upper support portion 29 is provided at the upper end of the extension portion 37 extending from the upper end of both carts 25.26 to the carry-in side and the carry-out side. It consists of support plates 38 that are mounted facing each other so as to maintain a slightly wide interval.

Movable platforms 39.40 that can move toward and away from each other in opposite directions are attached to the lower portions of both the carts 25 and 26, and bars are attached to extend to the loading and unloading sides of each movable platform 39.40. 41, the pipe lower clamping part 30
The clamping plates 42 constituting the two are mounted so as to face each other.

This clamping plate 42 is provided with pipe fitting recesses 43'l into which each of the group of pipes 9 is fitted individually when they move close to each other, as shown in FIG.

The height of the support plate 38 of the pipe upper support part 29 is the fifth
As shown in the figure, hanging tool 7φ: located slightly lower than the bottom surface of the hanging jig 10 split in half before being cut; hanging tool 7φ: a group (4) of pipes that will fall when cut. 9, the hanging jig 1 attached to each pipe 9
Uke stops through 0.

The movable base 39.40 for opening and closing the pair of clamping plates 42 of the pipe lower clamping part 30 is a cylinder 44 pivotally supported on the cart 25.26 side as shown in FIGS. 10 and 11.
and a piston rod 45 pivotally supported on the movable table 39 and 40 side.
They are driven toward and away from each other by a piston-cylinder unit 46 consisting of.

When driving the movable carriages 39, 40, a shaft 4 supported by a bearing 47 and installed parallel to the moving direction of the carriages 25, 26 so that both move in parallel.
Pinion gears 49 are fixed to both ends of the movable base 39.40, and two parallel gears 50 that mesh with both pinion gears 49 are attached to the movable base 39.40.
It is fixed along the direction of movement.

Reference numeral 51 indicates a movable base guide rail, which is attached to both sides of the lower end of the carriage 25.26, and 52 indicates a roller that fits into the rail 51 and is pivotally supported by the movable base 39.40.

Both carts 25 and 26 must move back and forth in synchronization with each other.As a means for this synchronization, a guide 53 holds the bottom of the cart 25 so that it can move in and out of the other cart 26. The conical engagement piece 54 was broken, and the carriage 2
6 is provided with a female engagement piece 56 which is held by a guide 55 so as to be movable in and out of the other carriage 25 side, and each of the engagement pieces 54 and 56 is connected to the movable platform 39 and 40 below, respectively. are connected to each other via a coupling member 57, and when both rotating bases 39, 40 move toward each other (when the clamping plate 42 of the pipe lower clamping part 30 clamps the pipe 9), both engaging pieces 54, 56
5 and 10.
Both carts 25.2 are fitted together as shown by imaginary lines in the figure.
6 to prevent displacement between them when they move along the rails 31, 32.

At painting location B shown in FIG. 3, there is a pipe upper clamp 58.
A positioning means crab consisting of a pipe lower clamp 59 and a pipe lower clamp 59 is provided.

When viewed from the front, the pipe upper clamp 58 and the pipe lower clamp 59 are as shown in FIG.

The pipe upper clamp 58 and the pipe lower clamp 59 are
Both have a pair of clamp arms 60.61, and each pair of clamp arms 60.61 is swung about its support shaft 64.65 by a piston/cylinder unit 62.63. The clamping plates 66, 67 (same shape as the pipe lower clamping clamping plate 42 shown in FIG. 10) attached to the inside of the lower end of the arm clamp a group (four pipes) of pipes 9 from both sides at the same time.

These pipe upper clamp 58 and pipe lower clamp 5
9 allows the clamped pipe 9 to move up and down.

Further, in this painting location B, there is a paint supply pipe 68 located concentrically above the upper end of each pipe 9 positioned by the upper pipe clamp 58 and lower pipe clamp 59, and an intake pipe located below the lower end of each pipe 9. 69 are provided.

Each paint supply pipe 68 is fixed to a fixture frame 70, and its lower end has a trumpet-shaped opening 71 that fits into the upper end of the pipe 9.
has.

Each intake pipe 69 is attached to an elevating table 74 that is movably supported by a guide rod 72 and moved up and down by a piston/cylinder unit 73, and is connected to a telescopic flexible pipe 75.
It is connected to an air intake means (not shown) via.

Further, a trumpet-shaped opening 76 is provided at the upper end of each intake pipe 69 to fit into the lower end of the pipe 9.

At the lifting location C shown in FIG. 3, there is a pipe upper lifting guide 7.
7 and pipe lifting means 78 are provided.

The pipe upper lifting guide 77 and the pipe lifting means 78 are as shown in FIG. 14 when viewed from the front in an enlarged manner, and as shown in FIG. 15 when the pipe upper lifting guide 77 is viewed from above.

The pipe upper lifting guide 77 includes a pipe guide 79 disposed on one side of the pipe conveyance path, and a pipe guide 79 disposed on one side of the pipe conveyance path.
and a planar U-shaped movable guide 80 that grips a group of pipes 9 in a vertically movable manner.

The pipe guide 79 is attached to the lower end of the arm 83.

The arm 83 is normally fixed at a fixed position by a fixing pin 81 and a pivot shaft 82, but it can also be rotated about the pivot shaft 82 by removing the pin 81.

The movable guide 80 is attached to the inside of the lower end of the arm 86 , and the arm 86 is swingable about the pivot shaft 84 and is swing-operated by the piston/cylinder unit 85 .

The pipe lifting means 78 is a piston/cylinder unit 8
It has a pipe lifting stand 88 which can be raised and lowered by means 7.

This pipe lifting table 88 is formed into a rectangular saucer shape that is large enough to receive a group (four pipes) of pipes 9 at the same time.
When lifting the lower end of the pipe, the lower end of the pipe - 2 is designed to prevent it from slipping and falling.

Next, the effects of the pipe inner surface coating apparatus having the above structure will be explained.

As shown in FIG. 1, the pipes 9 suspended from the suspension conveyance means 1 via the hanging devices 7 are arranged in groups of four pipes 7'.
1' - Continuously conveyed with appropriate intervals between each group,
Each pipe 9 is heated to a predetermined temperature by passing through a preheating furnace during its transport route.

At the end of the preheating furnace, the group of pipes 9 are arranged in a line in the transport direction by the pipe guide 22 as shown in FIG. 2, and then reach the suspension release location A shown in FIG. 3. do.

At this time, the clamping and conveying means 24
7 and the pipe holding section 28 on the unloading side are in positions that match the suspension release location A and the painting location B shown in FIG. 3, and the pipe lower clamping section 30 is in an open state.

The four serial pipes 9 enter between a pair of support plates 38 on the upper support part 29 of the upper pipe, and enter between a pair of clamping plates 420 on the lower pipe lower clamping part 30.

When a predetermined position is reached, the pair of cutting blades 13 and 14 of the suspension release means 12 cut off the two hanging tools 7 that suspend the four serial pipes 9.

At the same time, as shown in FIG.
The movable base 39.4 (l pistons shown in Fig. 10) on both sides of the
The cylinder units 46 move forward to approach each other, and along with this, the pair of bars 41 also approach, and the pair of clamping plates 42 of the pipe lower clamping part 30 move forward as shown in FIGS. 5 and 7. The lower portions of the four pipes 9 are held from the sides.

Therefore, the four pipes 9 that fall due to the cutting of the hanging tool 7 are prevented by the hanging jig 10 fixed to each pipe 9 being placed on the pair of support plates 38 of the pipe upper support part 29, and the pipes By the clamping action of the lower clamping part 30, it is held by the pipe holding part 27 on the carry-in side of the clamping and conveying means 24.

Next, the pair of carriages 25, 26 of the clamping and conveying means 24 are moved forward in the conveying direction along the guide rails 31, 32 by the cable cylinders 35, 36.
As a result of the approaching movement of 9.40, the engaging pieces 54, 5675 of both the carriages 25, 26 protrude and move closer to each other as shown by the imaginary lines in FIG. Therefore, both carts 25 and 26 move in perfect synchronization.

Due to the forward movement of the clamping and conveying means 24, the pipe holding section 27 on the carry-in side and the pipe holding section 28 on the carry-out side are moved to the painting place B.
and reaches a position suitable for the lifting location C.

At this time, both upper and lower pipe clamps 58 at painting location B.
The clamping plates 66, 67 of 59 are open, and the four pipes 9 held by the pipe holding section 27 on the carry-in side and transported from the suspension release location A are held in both upper and lower pipe clamps 58.
59 between the clamping plates 66 and 67, and stops at a predetermined position.

Next, the pipe upper clamp 58 and the pipe lower clamp 5
As shown in Fig. 12 and Fig. 13, each clamping plate 66.677
j: Close movement to clamp the vicinity of both upper and lower ends of each pipe 9.

At the same time, the intake pipe 69 rises due to the action of the gas piston cylinder unit 73, and its trumpet-shaped opening 76 opens:
Each pipe 9 is fitted and connected to the lower end opening of each pipe 9, and each pipe 9 is lifted up, and the upper end opening of each pipe 9 is also fitted and connected to the trumpet-shaped opening 71 of the paint supply pipe 68 as shown in the figure. (Thus, the paint supply pipe 68 and the intake pipe 69 communicate with each other via the pipe 9.

On the other hand, the pair of movable tables 39 and 40 of the clamping and conveying means 24 move backward one time, so that the pipe lower clamping part 30 is opened and the pair of retaining pieces 54 and 56 that have integrated both carts 25 and 26 are moved backward.
They also move backward and separate from each other.

In this state, the clamping and conveying means 24 is connected to the cable cylinder 35.
．． 36 returns to the original position shown in FIG.

As shown in FIG. 13, each pipe 9 has its upper end opening connected to a paint supply pipe 68, and the powder paint blown from the paint supply pipe 68 adheres to the inner surface and melts, thereby forming a coating film on the inner surface. She is given a 75-year-old discipline and is given an inside painting job.

At this time, since the suction pipe 6 u is connected to the lower end opening of the pipe 9, the excess powder paint is sucked and collected by its suction action, and is not scattered around.

Before the above-mentioned inner surface painting is completed, as mentioned earlier, at the suspension release location A, the suspension release means 12 performs the pro-eutectoid operation of the hanging tool 7 that suspends the subsequent group of pipes 9, and the subsequent A clamping and conveying means 2 for a group of pipes 9
Pipe holding operation 75=performed by No.4.

That is, the pair of movable tables 39 and 40 of the clamping and conveying means 24 move closer again and hold the group of pipes 9 following the suspension release location A in the pipe holding section 27 on the carry-in side. A pair of clamping plates 42 in the pipe lower clamping part 30 of the pipe holding part 28 on the side also move to close at the same time to hold the group of pipes 9 in the painting place B (the first
(See imaginary line in Figure 0).

Furthermore, as shown in FIG. 13, under each hanging jig 10 of the group of pipes 9 in this painting place B, there is a clamping and conveying means 2.
Since the pair of support plates 38 in the pipe upper support part 29 of the pipe holding part 28 on the unloading side of
By lowering the intake pipe 69 after completing the inner surface painting,
The painted pipe 9 is lowered and placed on the hanging jig 10 and the support plate 38, and is held by the pipe holding section 28 on the output side of the clamping and conveying means 24.

At the same time, the clamping plates 66 and 67 of the pipe upper clamp 58 and the pipe lower clamp 59 are also opened.

Next, the clamping and conveying means 24 is moved forward in the conveying direction again,
By moving both the pipe holding parts 27 and 28 from the unsuspension area A and the painting area B to positions that match the painting area B and the hanging area C, the subsequent group of pipes held in the pipe holding area 27 is The pipe 9 is moved to the painting location B and the inner surface is coated as described above, and the inner surface coated pipe 9 held in the pipe holder 28 is moved to the hanging location C.

Immediately after the 9 pipes with their inner surfaces painted were moved to the hanging location C,
The U-shaped movable guide 80 is moved closed by the operation of the piston/cylinder unit 85 of the pipe upper lifting guide 77, and a group of pipes 9 are moved between the fixed pipe guide 79 and the 14th pipe.
It is held movable up and down as shown in the figure and FIG. 15.

Furthermore, the pipe holding base 88 is raised by the operation of the piston/cylinder unit 87 of the pipe lifting means 78, and the group of pipes 9 held by the pine upper lifting guide 77 is lifted up to a predetermined height.

After this pipe lifting operation, the clamping and conveying means 24 opens its pipe lower clamping part 30 and returns to its original position.

A group of pipes 902 S raised to a predetermined height
The letter-shaped hook 8 is attached to the third conveyor rail 2 of the suspended conveyor means 1.
Coupled with the fact that it is low as shown in the figure, it is possible to manually hang it onto the S-shaped hooks 6 suspended from each trolley 3 of the suspension conveyance means 1.

At this time, if the previously cut pieces 7J of the hanging tool 7 remain on each hook 6.8 and appear to be a nuisance, they can be removed.

After the manual lifting operation 752 is completed, the lifting table 88 of the pipe lifting means 78 is lowered and the upper pipe lifting guide 77 is opened.

In this way, the inner surface coated pipe 9 is again suspended and conveyed to the next process by the original suspension conveyance means 1.

In addition, in this embodiment, a cuttable hanging tool 7 is used to release the pipe from hanging by cutting the hanging tool 7. It is also possible to use a hanging device configured to separate, and to configure the separation operation section of the hanging device to be automatically operated mechanically or electrically.

Furthermore, in this embodiment, the crab is painted by moving intermittently in groups of four pipes, and the number of pipes in each group is not limited to four.

For example, you can paint one by one, or paint 6 or 8.
Book.

It is also possible to paint 10 pieces at a time.

Since the present invention is as described above, there is no need for a large-capacity paint bath, and only the inner surface of the pipe can be coated by using the minimum necessary amount of paint.

Furthermore, unlike the conventional method of laying the pipe on its side and painting the inside, it not only does not require a large space, it also does not require a means to rotate the pipe, and it is easy to form a coating film of uniform thickness on the inside of the pipe. can.

In particular, the pipe inner surface coating apparatus according to the present invention provides a coating area in the middle of a route for transporting pipes in a vertical position, and distributes equal distance delivery intervals between the loading side and the unloading side around this coating area. A suspension release location and a suspension return location are provided, and a delivery operation is performed in which transported unpainted pipes are carried from the suspension release location to the painting location, and painted pipes are transported from the coating location to the suspension return location. Since this is carried out by reciprocating the holding and conveying means, which is equipped with an inlet side pipe holder and an outlet side pipe holder with a length equal to the delivery interval, the paint supply pipe and the intake pipe are connected to the pipe. In addition to being able to connect pipes reliably and quickly, the time required for pipe delivery can be significantly shortened.
Therefore, not only can it be easily adapted to automation, but also the inner surfaces of a large number of pipes can be coated with high efficiency.

[Brief explanation of drawings]

Figure 1 is a front view showing the suspended pipe transport state, Figure 2 is a plan view showing the hanging jig attached to the pipe, Figure 3 is a side view showing the entire device, and Figure 4 is the same painting location. 5 is a partially omitted front view at the suspension release location, FIG. 6 is a plan view showing the relationship between the pipe upper support part and the pipe, and FIG.
The figure is a plan view showing the relationship between the lower part of the pipe and the pipe.
FIG. 8 is a side view of the clamping and conveying means, FIG. 9 is a front view of the same, and FIG. 10 is a plan view showing the driving part of the movable table in the same means.
Fig. 11 is a side view of the same, Fig. 12 is a partially omitted front view at the painting location, Fig. 13 is a partially omitted front view showing the state at the time of painting, and Fig. 14 is a partially omitted front view at the hanging location. , FIG. 15 is a plan view showing the pipe upper lifting guide. 1... Hanging conveyance means, 2... Conveyance rail, 7...
Hanging tool, 9...pipe, 10...2-split hanging jig,
12... Hanging release means, 13.14... Cutting blade body,
17... Movable arm, 18... Piston/cylinder unit for driving the movable arm 17, 22... Pipe guide, 23... Detection rod, 24... Clamping and conveying means, 2
5.26... Trolley, 27.28... Pipe holding part,
29... Pipe upper support part, 30... Pipe lower clamping part, 31.32... Guide rail 35.36...
Cable cylinder, 38...Support plate, 39.40...
- Movable base, 42... Holding plate, 43... Pipe fitting recess, 46... Piston/cylinder unit for driving movable base, 49... Pinion gear, 50... Rack gear,
51... Rail for guiding the movable platform, 54... Conical engagement piece for synchronized movement of the carriage, 56... Female engagement piece, 58...
Pipe upper clamp, 59...pipe lower clamp,
60.61... Clamp arm, 62.63... Piston/cylinder unit for driving clamp arm, 66
．． 67... Holding plate, 68... Paint supply pipe, 69...
・Intake pipe, 73... Piston/cylinder unit for raising and lowering the intake pipe, 77... Pipe upper lift guide, 78...
- Pipe lifting means, 79... Pipe guide, 80...
・U-shaped movable guide, 85... Piston/cylinder unit for driving the movable guide, 87... Pipe lifting stand 8
8 piston/cylinder unit for lifting/lowering drive.

Claims (1)

[Claims] 1. A coating area 75 is provided at the intermediate point of a conveyance route in which a large number of hanging conveyance means ``lJ'' are connected by suspending pipes in a vertical position. A suspension release location and a suspension return location are provided on the unloading side with equidistant delivery intervals, and a positioning means provided with a pipe upper clamp and a pipe lower clamp is provided at the painting location, and the pipe is clamped by the positioning means. A coating means comprising a paint supply pipe connected relatively close to the upper end opening of the pipe from above and an intake pipe connected relatively close to the lower end opening of the pipe from below. Suspension release means for separating the pipe transported by the suspension transport means to the release location from the suspension transport means: A suspension release means is provided to support the painted pipe in a vertical position at the suspension return location and suspend the pipe from the suspension transport means. A pipe lifting means is provided for returning the pipe to the lower conveying means, and a pipe holding means is provided at the carry-in end of the extension portion having a length equal to the delivery interval to receive the pipe separated from the suspended conveying means and deliver it to the painting means. A pipe holding section is provided at the unloading end of the extension section for receiving the painted pipe from the painting means and delivering it to the pipe lifting means, and the pipe holding section is provided at the unloading end of the extension section, and the pipe holding section is provided to receive the painted pipe from the painting means and deliver it to the pipe lifting means, and the pipe holding section is provided at the carrying-out end of the extension section, and the pipe holding section is provided to receive the painted pipe from the painting means and deliver it to the pipe lifting means. A pipe inner surface coating device characterized by being provided with a clamping and conveying means for reciprocating between locations.