KR20170018676A

KR20170018676A - Square pipe hole processing apparatus

Info

Publication number: KR20170018676A
Application number: KR1020150112604A
Authority: KR
Inventors: 김권식
Original assignee: 주식회사 산돌기업
Priority date: 2015-08-10
Filing date: 2015-08-10
Publication date: 2017-02-20
Also published as: KR101779663B1

Abstract

The present invention relates to a method and apparatus for precise punching due to cutting by applying a fast mold, and to form punches uniformly and continuously at necessary intervals by the transfer of each tube, and to simultaneously form punches on one side or both sides Provide each tube air.
The pipe line air according to a preferred embodiment of the present invention comprises cutting equipment having an operation end repeating upward and downward movement in a vertical direction; A punching die fixed to the upper surface of the table of the cutting equipment and having at least one upper punch punch corresponding to the punch shape and generating a punching shear force interlocked with the operation end; A plurality of pipe work stations arranged at one side of the other die; A long bar for supporting each tube having one end fixed to a distal end of each of the tube work platforms and the other end being positioned close to the other of the other dies so as to support each tube inserted with a fast mold; And at least one punching cutter corresponding to the punching shape on the upper surface thereof and connected to the other end side of the long bar for supporting each pipe to be positioned in the punching area of the punching die, and; And a tube conveying unit which is installed on the work table so as to be able to be conveyed in the longitudinal direction and transfers each tube supported by the long bar for supporting each tube to the punch area by a predetermined pitch.

Description

Square pipe hole processing apparatus

[0001] The present invention relates to an air duct for air ducts used for forming a hollow in a hollow hollow pipe, and more particularly, And to the air ducts that can be formed.

Conventionally, laser machining or freeze-cutting was used to form a hollow tube with a hollow shape in accordance with the need and a desired position. However, the laser processing or the prism processing requires a high installation cost, and therefore, the cost is increased for machining a desired shape even if the machining depends on the outside. On the other hand, there are methods of processing using oxygen or grinders, but the state and shape of the machined surface are not constant, and the cost of the subsidiary material, such as gas, is large. Even if processed, precision and uniformity are remarkably reduced and it is difficult to use in actual reality.

In order to overcome the above-mentioned problem of equipment installation cost, accuracy and uniformity of processing conditions, a separate processing method is required.

As a background of the present invention, Korean Patent Registration No. 10-1311314 has proposed a hole punching apparatus for a metal pipe. In this background art, a metal pipe to be drilled is inserted into a pipe inserting metal, and then the die side punch is lowered to puncture the hole by the cutting force of the punch hole.

However, since the background art of the above-described electron pipes is pierced while being hand-held while holding the metal pipe, the productivity of the piercing work is low and productivity is low and it is difficult to set a uniform piercing position.

Another technology to be a background of the present invention is Korean Registered Patent Registration No. 10-1267363, in which a continuous barbed pipe workbench is proposed. This is done by inserting the pipe into the lower mold connected to the connecting rod, passing the punching hole of the upper mold for punching the pipe through the punching die, and transferring the pipe to the servo motor.

The latter background technology can automatically transfer the pipe after the punching, but it has a structure in which the punching hole is pierced only when the pipe and the punching die are completely pierced. Therefore, for example, the background art has a problem that it can not be applied to have a perforation on only one side of a square pipe.

Korean Registered Patent Registration No. 10-1311314 (hole for perforation for metal pipe) Korean Registered Patent Registration No. 10-1267363 (Handrail Pipeline Continuous Pier)

Therefore, the present invention can precisely puncture by cutting by applying a fast metal mold, and can form perforations uniformly and continuously at necessary intervals by transferring each tube, and can simultaneously puncture the desired one surface or opposite surfaces The purpose is to provide an air of each angle.

According to a preferred embodiment of the present invention,

A cutting device having an operation end that repeats up and down movement in a vertical direction;

A punching die fixed to the upper surface of the table of the cutting equipment and having at least one upper punch punch corresponding to the punch shape and generating a punching shear force interlocked with the operation end;

A plurality of pipe work stations arranged at one side of the other die;

A long bar for supporting each tube having one end fixed to a distal end of each of the tube work platforms and the other end being positioned close to the other of the other dies so as to support each tube inserted with a fast mold;

And at least one punching cutter corresponding to the punching shape on the upper surface thereof and connected to the other end side of the long bar for supporting each pipe to be positioned in the punching area of the punching die, and;

And a tube conveying unit which is installed on the work table so as to be able to be conveyed in the longitudinal direction and transfers each tube supported by the long bar for supporting each tube to the punch area by a predetermined pitch.

The scrap removing unit may further include a scrap removing unit for scrapping the remaining scrap from each pipe,

The scrap removing unit includes:

A push bar movably inserted into the inside of the long bar for supporting the pipe;

A scrap removing plate connected to a tip end of the push bar and positioned inside the die for removing scrap from the die;

And a scrap removing cylinder connected to a rear end of the scrap removing plate and fixed to a distal end of each of the pipe work bench to reciprocate the push bar back and forth.

Further, in the above-described conventional die,

A lower mold disposed at a lower portion with respect to each tube;

An upper mold disposed opposite to the upper mold and connected to an operation end of the cutting equipment;

An upper perforation punch disposed in a direction perpendicular to the upper mold;

A plurality of rollers for rotatably installed on the lower mold side for guiding the machining transfer of each of the tubes while being in rolling contact with both side surfaces of the tubes;

A lower part of the upper mold and supported by the lower part of the upper mold;

A plurality of mold guide pins, one end of which is fixed to the upper mold and the other end of which is inserted into the lower mold after inserting the respective tube presser plates;

And a plurality of perforated positioning pins supported by an upper metal mold to set a punching position with respect to the fast mold and protruding by a predetermined amount by inserting a perforated plate.

Further, a lower perforation punch is further provided on the lower mold side in the vertical direction.

Further, the above-

A punching cut hole having a perforated shape is formed on the upper surface, the upper surface, and the lower surface, and a tapered portion is formed so as to smoothly flow in each tube at the tip thereof. The tapered portion is contacted to the inner surface of each tube A plurality of fastening positioning holes are formed on the upper surface of the roller so as to determine the mounting position of the fastening die. .

In addition, a long bar connector is further assembled to connect the long bar for supporting each pipe to the rear end of the quick die, and the long bar connector is coupled to the quick die with a dovetail-shaped coupling jaw at the tip thereof.

Further, each of the pipe-

A tubular conveyor belt conveyed along a linear guide rail provided on an upper surface of the workbench position workbench;

A conveying motor mounted on one side of the conveying table and connected to the rack gear arranged in the longitudinal direction on the each work table by a pinion gear of an output shaft;

A tubular conveyance block fixed to the upper surface of the tubular conveyance belt;

And a long bar supporting roller which is in rolling contact with a long bar for supporting each pipe at the front end of each pipe conveying block.

The hollow pipe air of the present invention is formed by hollow hollow molds without completely passing hollow pipes through which hollows are hollow. The shape of the punch and the number of the fast metal molds are adjusted according to the required shape, So that precise piercing can be achieved. Therefore, it is possible to perform the punching work which is quick, precise and uniform, without using the conventional laser processing or freeze-cutting, thereby improving the quality and productivity and reducing the facility cost.

In addition, each hollow hollow pipe can be buried at a low cost without putting an excessive facility cost of a laser plasma device or the like.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the principles of the invention, Shall not be construed as limiting.
1 is a front view of an air duct in accordance with the present invention;
Fig. 2 is an enlarged view of the mold side applied to the air of each pipe shown in Fig.
3 is a partial perspective view of the air of each pipe shown in Fig.
Fig. 4 is a perspective view of the scraper removal unit side of the air duct of Fig. 1; Fig.
Fig. 5A is a front view of a tandem die used in the present invention; Fig.
Figure 5b is a side view of Figure 5a.
FIG. 6A is a view showing a setting process of a rapid-forming die applied to the present invention; FIG.
FIG. 6B is a view showing a piercing state using a fast-forming die applied to the present invention. FIG.
Fig. 7 is an enlarged view of the scraper removal unit and the pipe transfer unit shown in Fig. 1. Fig.
FIG. 8 is a perspective view of the apparatus shown in FIG. 3 in a state where each tube is inserted into a long bar for supporting a tube;
FIGS. 9A and 9B are perspective views showing various forms of a fast-forming die according to the present invention. FIG.
10A and 10B are perspective views showing various shapes of the tubes processed using the air of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto.

The air duct 10 shown in FIG. 1 according to the present invention is for machining the perforations 1a in the metal pipe 1 as a perforated material as shown in FIGS. 10a and 10b. The perforations 1a may be in the form of peanut holes as illustrated or various other shapes. The arrangement of the perforations 1a may be one column as shown in FIG. 10a or two columns as shown in FIG. 10b. In addition, the perforations 1a are formed only on the upper surface of each tube 1 but may be formed on the side surface including the lower surface.

As shown in FIGS. 1 and 2, each air pipe 10 has a cutting device 20 in which the operation end 201 repeats upward and downward movement in the vertical direction. The cutting equipment 20 may be a punching machine for generating a punching shear force in response to hydraulic pressure or cranking motion, or a pressing equipment for plastic working. A shearing load is applied to the working end 201, which can sufficiently exert a shearing force used for the front end of each pipe 1.

The cutting equipment 20 is provided with a table 22, and the punching die 30 is arranged and fixed on the upper surface of the table 22. [ The punching die 30 has one or more perforation punches 33 corresponding to the shape of the perforations 1a of the respective pipes 1 and is provided with a perforation shearing force of the working end 201 interlocked with vertical downward movement of the cutting equipment 20 And cut into each tube 1 to form perforations 1a.

For example, the perforation punch 33 may be installed solely in the other mold 30 so as to puncture one of the square pipes 1. As another example, two perforated punches 33 may be provided in parallel with each other on the other common metal mold 30 so that the perforations may be simultaneously formed on the two perforated pipes 1, and two perforated punches 33 may be formed on one perforated pipe 1 Heat may be generated.

As shown in FIGS. 2, 5A and 5B, the punching die 30 includes a lower mold 31 disposed at the lower portion with respect to each pipe 1, An upper perforation punch 33 provided vertically to the upper mold 32 and an upper perforation punch 33 provided to the lower mold 31 so as to be rotatable and connected to the operation end 201 of each of the upper and lower molds 20, A plurality of rollers 34 for outsourcing rollers for guiding the feed of the workpiece 1 while rolling in contact with both side surfaces of the upper die 32, A plurality of metal molds 36 which are inserted into the lower mold 31 after one end is fixed to the upper mold 32 and the other end is inserted into the lower metal mold 31 by inserting the metal pipe presser plate 36, The upper mold 32 is supported by a spring 38 so as to set the punching position between the guide pin 37 and the fast mold 50 And a plurality of perforation positioning pins 39 protruding by a predetermined amount by inserting a tube retaining plate 36.

2, the pressing die 36 is positioned above the upper surface of each pipe 1 by a predetermined distance, and the operating end 201 is lowered by the cutting equipment 20 The presser plate 36 presses the upper surface of each pipe 1 by the pressure of the spring 35 and then the upper perforation punch 33 is pushed by the pressure of the spring 35 So that the perforations 1a are formed.

Each pipe work bench (40) is disposed on one side of the other die (30).

As shown in FIGS. 3, 4 and 7, the individual pipe position workbench 40 has a height corresponding to the height of the table 22 and a length enough to arrange the pipes 1 as workpieces sufficiently in the longitudinal direction. Each pipe position workbench 40 is provided with a linear guide rail 44 and a rack gear 46 for transferring a feed belt 61 on the side of each pipe conveying unit 60 to be described later. The linear guide rails 44 are provided on the upper surface of each pipe position workbench 40 and the rack gears 46 are disposed below the linear guide rails 44. In addition, a long bar fixing stand 48 is installed at the end of each pipe position workbench 40 for installing a long bar 90 for supporting each pipe and a scrap removing unit 70. The long bar fixing base 48 is divided and assembled into a lower fixing base 48b and an upper fixing base 48a fixed to the upper face of the lower fixing base 48b by bolts.

There is provided a long bar 90 for supporting each pipe horizontally supporting the respective pipes 1.

One end of the long bar 90 for supporting the tube is fixed to the distal side long bar fixing base 48 of the respective tube position workbench 40 and the other end is positioned close to the other tongue mold 30, Thereby supporting the respective pipes 1. At this time, the long bar 90 for supporting the pipe is supported on the long bar supporting roller 64 by inserting the pipe conveying block 63 on the side of the pipe conveying unit 60 as shown in FIG. 3 and FIG.

Therefore, each tube 1 is inserted into the inner tube supporting rods (FIG. 2) by inserting the inner mold 50 as shown in FIGS. 2 and 6 while the tube transfer rods 61 on the tube transfer unit 60 side are waiting at the distal end The respective pipes 1 are moved in the perforation operation by the respective pipe transport block 63 being moved toward the pore area by the driving of the feed motor 62 on the pipe feed unit 60 in this state, .

The inner mold 50 is positioned in the punching area of the punching die 30. The inner die 50 is positioned between the presser plate 36 of the other die 30 and the lower die 31 and connected to the vertical bar 90 for horizontal support. Therefore, the fast mold 50 also serves to guide the tube 1 to be inserted into the tube 90 for supporting the tube.

As shown in Figs. 6 and 9, the fast mold 50 is made of a hollow metal having a rectangular cross section having the same shape and a smaller length than the pipe 1, which is a workpiece, in a predetermined length. The punching cut hole 51 of the punching shape may be formed on the upper surface or the upper and lower surfaces of the die 50. The inner mold 50 is provided with tapered portions 52 for smoothly introducing the pipes 1 to the front end thereof and rollers 53a and 53b for supporting inner pipes which roll on both sides of the inner and outer surfaces, Respectively. The fast mold 50 is inserted into a plurality of puncture positioning pins 39 on the upper surface to determine the same number of fast mold positioning positions corresponding to the puncturing pins 39 so as to determine the installation position of the fast mold 50 A hole 54 is formed.

Therefore, when the fast mold 50 is installed on the side of the lower mold 31, the operation end 201 of the cutting equipment 20 is gradually lowered so that the puncturing pin 39 on the side of the upper mold 32, Is adjusted to coincide with the positioning hole (54), and is connected to the long bar (90) for supporting each pipe. Therefore, the upper perforation punch 33 is accurately aligned with the punching cut hole 51 of the fast mold 50, so that a correct perforation is achieved.

As shown in FIGS. 3 and 6B, a long bar connector 501 may be further assembled to connect the long bar 90 for supporting each pipe to the rear end of the fast mold 50. The long bar connector 501 has a dovetail-shaped coupling step 501a at the tip end thereof forcibly fitted into the coupling groove 55 of the fast mold 50. In addition, the long bar connector 501 has a thread groove 501b formed at the rear end of the long bar connector 501 to be screwed with the forming end of the long bar 90 for supporting the respective tubes. The long bar connector 501 also functions to easily connect the other die with the shape of the punching cutter 51 changed.

Each pipe position workbench 40 is provided with a pipe pipe transfer unit 60 for transferring each pipe 1 to the punching work area. In other words, each pipe feed unit 60 serves to feed the pipe 1 inserted and supported by the pipe 90 for supporting each pipe by a predetermined pitch.

3, 4 and 7, each tube conveying unit 60 includes a tubular conveying belt 61 conveyed along a linear guide rail 44 provided on the upper surface of each tubular work bench 40, A feed motor 62 connected to the rack gear 46 disposed in the longitudinal direction on the work table 40 via the pinion gear 622 of the output shaft and driven and controlled by an electrical control signal, A tubular conveying block 63 fixed to the upper surface of the tubular conveying table 61 and a long bar supporting roller 64 in a rolling contact with a long bar 90 for supporting each tubular member at the front end of each tubular conveying block 63 .

Each tube conveying belt 61 has a side plate 611 for fixing the conveying motor 62 to the side surface and each tube conveying block 63 has a hollow structure for inserting the long bar 90 for supporting each tube.

Therefore, when the feed motor 62 is driven, the respective pipe conveying belts 61 are moved along the linear guide rails 44 together with the pipe conveying blocks 63, Each tube 1 inserted in the used long bar 90 is transferred to the punched region by the amount of the conveyance.

6B and FIG. 7, the screW removal unit 70 may be further provided for removing the scrap 12, which is cut from each pipe 1 and becomes a cutting piece, as shown in FIG.

The scrap removing unit 70 includes a push bar 72 which is freely movably inserted into the inside of the long bar 90 for supporting the pipe and a scraper 72 which is connected to the tip of the push bar 72, A scrap removing plate 74 connected to the rear end of the scrap removing plate 74 and fixed to the end of each pipe position workbench 40 to remove the scrap from the fast mold 72, And a scraping cylinder 76 for reciprocating forward and backward.

Therefore, the push bar 72 is moved back and forth inside the long bar 90 for supporting each pipe during the reciprocating operation of the scrap removing cylinder 76, and the scrap removing plate 74 moves the scrap 12 in the fast- (50).

Reference numeral 300 denotes an 'each tube supporting workbench' which is disposed on the other side of the cutting equipment 20 and supports the perforated tube 1.

The percussion work of each pipe 1 through the air pipe 10 of the present embodiment having the above-described structure will be described.

3, the pipe 1 as the workpiece is placed in a state in which the pipe feeder 61 of the pipe feeder unit 60 is standing at the rear end of the pipe work bench 40, as shown in Figs. 6B and 7 And is inserted into the long bar 90 for supporting each pipe through the fast mold 50, and is waiting for machining. The rear end of each pipe 1 is in close contact with the front surface of each pipe transport block 63 of the pipe transport unit 60 and the front end thereof is positioned in the fast mold 50 or at a certain distance from the fast mold 50 .

During the insertion of each pipe 1, the fast mold 50 is passed through the rollers 53a and 53b for supporting each pipe and the other mold 30 is rotated through the rollers 34 and 34 for each pipe, So that smooth insertion of each tube 1 is achieved.

Then, each pipe feed motor 62 rotates by a predetermined amount. Thus, the tubular conveying belt 61 on the side of the tubular conveying unit 60 is conveyed toward the perforation work area by a predetermined pitch. At this time, each pipe (1) is moved by a predetermined amount by the pipe conveying block (63), and the piercing part is located in the piercing area of the other common mold (30).

Also in this case, during delivery of each pipe 1, the inner mold 50 is passed through the inner pipe supporting rollers 53a and 53b and the punching die 30 is passed through the pipes 34 and 34 for each pipe, So that smooth transport is achieved.

Then, the cutting instrument 20 is operated so that the operation end 201 performs the up-and-down movement once, and the upper perforation punch 33 exerts a shearing force on each of the tubes 1 to form the perforation 1a .

This is because the upper plate 32 on the side of the other die 30 is moved downward and the pressing plate 36 pushes the upper surface of each tube 1 by the pressure of the spring 35 and presses the upper surface of the upper perforation punch 33 ) Exert a shearing force on the tube 1 to form the perforation 1a.

At this time, the scrap 12 cut by the perforation 1a is left on the inner bottom of the fast mold 50.

Next, as shown in Fig. 2, the scrap removing cylinder 76 on the scrap removal unit 70 side performs forward and backward reciprocating motion. As a result, the push bar 72 pushes the scrap removing plate 74 back to its original position, so that the scrap 12 is removed from the inside of the fast mold 50 by the scrap removing plate 74.

Therefore, the scrap 12 is not accumulated in the inside of the fast mold 50, so that continuous puncturing operation is not obstructed.

Then, as shown in FIG. 10, the workpiece having the perforations 1a formed at a predetermined pitch is manufactured as shown in FIG. 10 by repeating the movement of the pipe pitch, the perforation of the pipe, and the scrap removal. Here, the pitch interval is determined according to the feed amount of the feed motor 62 on the side of the pipe feed unit 60.

As described above, according to the shape of the punch and the number of the fast molds 50, it is possible to puncture the shape of the main pipe 10 with the hollow pipe 1 as required and the required position. Therefore, it is possible to perform the punching work which is quick, precise and uniform, without using the conventional laser processing or freeze-cutting, thereby improving the quality and productivity and reducing the facility cost.

In the meantime, the air duct 10 of the present invention may be constructed such that a lower perforation punch 33a is further installed in the vertical direction on the side of the lower mold 31 as shown in FIG. In this case, perforations are simultaneously formed on the upper surface and the lower surface of each tube 1.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the above teachings. will be. The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

20: Cutting equipment
30: Other mold
40: Each position work bench
50: Speed Mold
60: Each tube conveying unit
70: scrap removal unit
90: Long bar for supporting each pipe

Claims

In each tube air for machining the perforation 1a in each tube 1,
A cutting apparatus (20) having an operation end (201) for repeating up and down movement in the vertical direction;
The cutting apparatus 20 includes at least one upper perforation punch 33 fixed to the upper surface of the table 22 and corresponding to the perforation 1a, A common mold 30;
A respective pipe work bench (40) disposed at one side of the other dies (30);
And the other end of which is positioned close to the punching die 30 so as to support the respective pipes 1 inserted through the fast mold 50, )Wow;
A plurality of punching holes 51 corresponding to a punch shape on the upper surface and connected to the other end side of the respective pipe supporting rods 90 for positioning in the punching area of the punching die 30, (50) for guiding the inner tube (50) to be inserted into the long bar (90) for supporting the tube;
And a tubular conveying unit 60 which is provided so as to be capable of being conveyed in the longitudinal direction on the workbench position workbench 40 and which conveys each of the tubes 1 supported by the longbars 90 for supporting each tube to the punch region by a predetermined pitch And the air flow direction of each of the tubes.

The method according to claim 1,
Further comprising a scrap removing unit (70) for removing the scrap (12) remaining in the pipe (1)
The scrap removal unit (70)
A push bar 72 inserted freely movably in the inside of the long bar 90 for supporting the pipe;
A scrap removing plate 74 connected to a front end of the push bar 72 and positioned inside the fast mold 50 to remove scrap from the fast mold 50;
And a scraping removal cylinder (76) connected to the rear end of the scrap removal plate (74) and fixed to the end of each pipe position workbench (40) to reciprocate forward and backward the pushbars (72) Each tube air.

The method according to claim 1,
The other die (30)
A lower mold 31 disposed at a lower portion with respect to each pipe 1;
An upper mold 32 disposed opposite to the upper mold 31 and connected to an operation end of the cutting equipment 20;
An upper perforation punch 33 installed vertically to the upper mold 32;
A plurality of roller-out rollers (34) rotatably installed on the side of the lower mold (31) for guiding the machining transfer of the tubes (1) in rolling contact with both side surfaces of the tubes (1);
A square tube presser plate 36 supported by the upper mold 32 and supported by the pressure of the spring 35 at the time of perforation;
A plurality of mold guide pins (37) one end of which is fixed to the upper mold (32) and the other end of which is inserted into the lower mold (31) after inserting the pipe holding plate (36);
And a plurality of puncture positioning pins 39 supported by the upper mold 32 by a spring 38 to protrude a predetermined amount by inserting the perimeter presser plate 36 to set the punching position with the fast mold 50 Wherein the air flow passage is formed in the air passage.

The method of claim 3,
And a lower perforation punch (33a) is further provided on the side of the lower mold (31) in the vertical direction.

The method of claim 3,
The fast mold (50)
A punching hole 51 of a perforated shape is formed on the upper surface or both the upper surface and the lower surface, and a tapered portion 52 is formed so as to smoothly flow in each tube at the tip, 53a and 53b which are in contact with the inner surface of each pipe before and after rolling and rolls are provided in the upper surface of the upper mold 50, The number of the fast-type mold positioning holes 54 is determined so as to determine the number of the fast mold positioning holes.

6. The method of claim 5,
A long bar connector 501 is further assembled to connect the long bar 90 for supporting each pipe to the rear end of the fast mold 50. The long bar connector 501 has a dovetail- And is coupled to the inner mold (50).

The method according to claim 1,
The tube-conveying unit (60)
A tubular conveyor belt 61 conveyed along a linear guide rail 44 provided on the upper surface of the tubular position workbench 40;
A feed motor 62 mounted on one side of the feed belt 61 and connected to a rack gear 46 arranged in the longitudinal direction of the pipe work bench 40 through a pinion gear 622 of an output shaft;
A tubular conveying block 63 fixed to the upper surface of the tubular conveying belt 61;
And a long bar supporting roller (64) in rolling contact with a long bar (90) for supporting each pipe at the front end of each pipe conveying block (63).