JPH0446672A - Manufacture of lance pipe with connector and lance pipe with connector - Google Patents

Abstract

PURPOSE:To make sure of gap plugging in a lance pipe and to obtain the lance pipe with connector having high melting boring efficiency by fitting packing at outer end part of inner pipe in the lance pipe, pressing in one end of the connecting pipe and deforming as expansion-opening the end part of inner pipe to radial direction. CONSTITUTION:The packing 10 is fitted to the outer end part of inner pipe 2 in the lance pipe P1 and on the other hand, a connector receiving body 20 is fitted to the other end of a connecting pipe P2. Then, the end part of lance pipe P1 is pressed into the one end of connecting pipe P2 to press-weld outer pipe 1 of the lance pipe P1 to inner wall of the connecting pipe P2. Further, the pressing-in is progressed and plural metal wires 3 in the lance pipe P1 are abutted on inclining face of a projection 21 for expansion-opening in the connector receiving body 20 and bent so as to expansion-open to the radial direction. At the same time, the metal wires 3 are bitten into the inner pipe 2 and combining condition of both 2, 3 is strengthened. Further, the inner pipe 2 is press-welded with the inner wall of outer pipe 1 with the packing 10 and press-welded with the end face of outer pipe 1 to plug the opening part at end part of the gap space 5.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is applicable to structures such as reinforced concrete and other structures, metal materials such as steel frames, refractories such as fire bricks, rocks, or underwater structures. The present invention relates to a method for manufacturing a lance pipe with a joint for an oxygen lance used for cutting an oxygen lance, which involves drilling, cutting, and disassembling objects to be fused, such as structures and reefs, while melting them, and the lance pipe with a joint.

(Prior art) Oxygen lance cutting involves flowing high-pressure oxygen into the pipe from the proximal end of the lance pipe, exposing the tip of the lance pipe to the oxygen that blows out, and igniting and burning the tip of the lance pipe. The workpiece is perforated and cut using high heat caused by oxidation reaction, flame, and mechanical pressure.

As described in Japanese Patent Application Laid-Open No. 53-113247, a conventional lance pipe has a metal inner pipe inserted into an outer pipe, and a slight gap is left between the outer pipe and the inner pipe. , a plurality of metal wires are arranged inside the inner tube, a gap between the outer tube and the inner tube is used as the first gas flow passage, and a plurality of first gas flow passages are provided inside the inner tube. has been done.

However, with lance pipes such as those mentioned above, oxygen is also supplied to the gap between the outer and inner tubes, which tends to cause excessive combustion, and the outer and inner tubes burn quickly, causing the flame to become concentrated. If the lance is not properly formed, the efficiency of fusing and drilling will be significantly reduced, and if the lance is not formed in a way that allows oxygen to exit uniformly from between the outer tube and the inner tube, the lance will continue to burn unevenly, resulting in uneven wear. There are disadvantages such as the flame is easily generated, the flame tends to spread outward, it is difficult to concentrate only on a predetermined melting point of the object to be melted, and it is difficult to perform efficient cutting and drilling work.

Therefore, in order to solve these difficulties, the applicant of the present application developed a lance pipe for oxygen lance (Utility Model No. 62142471).
No.) was proposed.

This consists of an outer tube, an inner tube inside the outer tube, and a plurality of metal wires inside the inner tube, and each metal wire inside the inner tube is inscribed on the inner wall surface of the inner tube. Along with urging,
Adjacent metal wires are circumscribed and arranged in a substantially annular shape, and the part surrounded by the metal wires is a relatively large space as the main oxygen flow path, which is surrounded by the adjacent metal wires and the inner wall surface of the inner tube. The portion is defined as an auxiliary oxygen flow path which is a smaller space than the main oxygen flow path, and a gap space is formed between the inner wall surface of the outer tube and the outer wall surface of the inner tube. It is configured to be closed by a closing part provided in the gap, and the supply of oxygen into the gap space is blocked.

(Problem to be solved by the invention! 1) When closing the gap space of the lance pipe, for example, the outer pipe was often caulked in a band shape along the circumference using a press machine or a roll machine. . However, since caulking using a press or roll machine is performed with a fairly strong force, the arrangement of the metal wires arranged in a ring may become uneven, the outer tube or inner tube may be distorted, and oxygen leakage may occur. The flow state and flow rate are not constant and become non-uniform, causing variations in the combustion state in the circumferential direction of the lance pipe.
There were drawbacks such as the inability to obtain a uniform and stable combustion state.

Therefore, the present invention makes it possible to reliably close the gap space of the lance pipe configured as described above, and to perform these closing means simply and quickly. When connecting a new lance pipe to the base end of the lance pipe in advance to continue work, the joint pipe can be used to close the gap at the same time, making it easy to use. It was created with the aim of making it possible to easily manufacture a lance pipe with a joint that has a high ability to cut and drill holes.

(Means for Solving the Problems) Therefore, in the method for manufacturing a lance pipe P with a joint according to the present invention, an inner pipe 2 is installed inside an outer pipe 1 so that a gap space 5 is appropriately provided, and a plurality of metal The wires 3 are inscribed in the inner wall surface of the inner tube 2 and adjacent metal wires 3 are circumscribed to form a substantially annular shape, and the base end portions of the inner tube 2 and the metal wires 3 are connected to the outer tube 1.
A lance pipe P1 that slightly protrudes from the base end of
form. Then, a space closing packing 10 is fitted onto the proximal end of the inner pipe 2 of the lance pipe P1, and a joint receiver 20 is attached to the other end of the joint pipe P2. Then, on one end of the joint pipe P2, the lance pipe P
Forcibly press-fit the proximal end of lance pipe P1 into the outer pipe 1 of lance pipe P1.
The outer wall surface is brought into pressure contact with the inner wall surface of the joint pipe P2, and the plurality of metal wires 3 of the lance pipe P1 are brought into contact with the inclined surface of the substantially conical expansion protrusion 21 provided at the tip of the joint receiver 20,
The metal wires 3 are bent gradually so as to expand in the radial direction, and at the same time as the metal wires 3 are bent, the inner tube 2 is deformed to expand its diameter by a plurality of metal wires 3, and the space closing packing 10 is pressed against the inner wall surface of the joint pipe P2. At the same time, a means is adopted for fixing the joint pipe P2 to the lance pipe P1 with the gap space 5 between the inner wall surface of the outer pipe 1 and the outer wall surface of the inner pipe 2 being closed with a space closing packing 10.

In addition, in the lance pipe P with a joint of the present invention, a plurality of metal wires 3 are installed in a substantially annular shape in the inner tube 2 that is installed inside the outer tube 1, and the base end portions of the inner tube 2 and the metal wires 3 are A lance pipe P is formed by slightly protruding from the base end portion of the outer tube 1.
1, and a joint pipe P2 that is externally fitted and fixed to the base end portion of the lance pipe P1. A space-occluding packing 1 is provided at the proximal end of the inner pipe 2 of the lance pipe P1.
0 is externally fitted, and the outer wall surface of the outer pipe 1 of the lance pipe P1 is brought into pressure contact with the inner wall surface of the joint pipe P2.

Then, each of the proximal end portions of the plurality of metal wires 3 which are inscribed in the inner wall surface of the inner tube 2 and arranged adjacent to each other in a substantially annular shape is bent so as to expand in the radial direction,
The proximal end portion of the inner tube 2 is expanded in diameter. Moreover, the space closing packing 10 is brought into pressure contact with the inner wall surface of the joint pipe P2,
A gap space 5 provided between the inner wall surface of the outer tube 1 and the outer wall surface of the inner tube 2
A means of closing the space with a space-closing gasket 10 was adopted.

(Function) Therefore, in the method for manufacturing the lance pipe P with a joint of the present invention, the plurality of metal wires 3 of the lance pipe P1 are forced toward one end of the joint pipe P2 at the base end portion of the lance pipe P1. At the time of press-fitting, the joint receiver 20 comes into contact with the inclined surface of the substantially conical expansion protrusion 21 provided at the tip and is gradually bent to expand in the radial direction. Furthermore, the inner tube 2 is deformed by bending the metal wire 3 so that the diameter of the portion in contact with the metal wire 3 is expanded. At this time, the space closing packing 10
It is pressed by the inner tube 2 so as to come into pressure contact with the inner wall surface, closing the gap space 5, and the space closing pipe P2 and the inner tube 2 are fixed to each other via the space closing packing 10.

In addition, in the lance pipe P with a joint of the present invention, the outer pipe 1 of the lance pipe P1 has an outer wall surface that is connected to the joint vibe P2.
It comes into pressure contact with the inner wall surface and is prevented from being removed from the joint pipe P2. Each of the base end portions of the plurality of metal wires 3 is bent so as to expand in the radial direction, and the inner tube 2 has a diameter expanded at the portion of the base end portion that contacts the metal wire 3. It's deformed. The space closing packing 10 is connected to the joint pipe P2.
It comes into pressure contact with the inner wall surface, and closes the gap space 5 provided between the inner wall surface of the outer tube 1 and the outer wall surface of the inner tube 2.

(Example) Hereinafter, the present invention will be explained with reference to illustrated examples.

In the figure, P1 indicates a lance pipe for an oxygen lance, and this lance pipe P1 is a metal (mainly made of iron) outer tube 1.
and metal (mainly made of iron) inside this outer tube 1.
Consisting of an inner tube 2 and a plurality of metal wires 3 (mainly made of iron) installed inside the inner tube 2, the metal wires 3 installed inside the inner tube 2 are connected to the inner wall surface of the inner tube 2 The metal wires 3 are inscribed in each other, and the adjacent metal wires 3 are circumscribed and arranged in an annular shape, forming a gap space 5 between the inner wall surface of the outer tube 1 and the outer wall surface of the inner tube 2, and surrounding the metal wires 3. The central part of the lance pipe P1 is the main oxygen flow path, and the adjacent metal wires 3 and the inner pipe 2
Each portion surrounded by the inner wall surface is configured as an auxiliary oxygen flow path. Furthermore, the proximal end portion of the inner tube 2 and the metal wire 3 is
The proximal end portion of the outer tube 1 protrudes from the proximal end portion, and the proximal end portion of the inner tube 2 is formed to protrude slightly from the proximal end portion of the metal wire 3.

By the way, the inner tube 2 has an outer diameter smaller than the inner diameter of the outer tube 1 and is arranged so as to be concentric with the outer tube 1 (although it does not necessarily have to be concentric). By holding the provided appropriate holding means, the inner wall surface of the outer tube 1 and the inner wall surface of the inner tube 2 are
A gap space 5 is secured between the outer wall surface and the outer wall surface. That is, the specific means for holding the inner tube 2 within the outer tube 1 is as follows:
Partial welding means, partial caulking means, and other appropriate means can be employed. Furthermore, the position, number, etc. of the holding means can be freely set.

In addition, the specific configuration, shape, size, material, number of metal wires 3, cross-sectional shape of each of the gap space 5, main oxygen flow path, and sub oxygen flow path, The ratio of cross-sectional area, etc. can also be set freely as appropriate.

In the figure, P2 indicates a joint pipe for connecting the lance pipes P1 as described above. This joint pipe P2 is made of metal (mainly iron) pipe material, and both ends A tightening part whose diameter is gradually reduced as it goes from the center to the center is provided, and by forcibly press-fitting the lance pipe P1 into this tightening part, the lance pipe P
1 can be fixed to the joint pipe P2, and the lance pipes P1 can be connected to each other.

By the way, the narrowing state of the tightening portion in the longitudinal center portion of the joint pipe P2 is a relatively gentle curved narrowing state,
The joint pipe P2 can have a relatively gentle linear narrowing state, a relatively gentle compound curved narrowing state, etc., and the joint pipe P2 has a part along one end bordering approximately the center in the longitudinal direction. The other end portion may not be formed symmetrically, and for example, a lance pipe P1 of a different diameter may be connected thereto. Further, the specific shape, dimensions, material, etc. of the joint pipe P2 can be freely set as appropriate.

In the figure, 10 indicates the inner wall surface of the outer pipe 1 and the inner pipe 2 of the lance pipe P1.
A space closing packing 10 is shown that closes the gap space 5 between the outer wall surface and the base end portion of the lance pipe P1, and this space closing packing 10 is made of a suitable elastic material such as a rubber material, a synthetic resin material, or the like. It is formed into an annular shape using an appropriate relatively ductile metal material (for example, copper, lead, or an alloy thereof, etc.) or an appropriate paper material, and is fitted onto the inner tube 2 of the lance pipe P1. It is formed to be able to sufficiently close the gap space 5 at the proximal end surface portion. Note that its specific configuration, shape, dimensions, material, etc. can be freely set as appropriate.

Reference numeral 20 in the figure indicates a joint receiver that can be detachably attached to the other end of the joint pipe P2, and this joint receiver 20 has a substantially conical shape (or ,
A polygonal pyramid-shaped expansion protrusion 21 is provided in a protruding manner. still,
The joint receiver 20 is formed so that its distal end portion can be inserted into the other end portion of the joint pipe P2, and its base end portion is formed so that it can be held stably with a chuck or the like as appropriate. The structure includes a stepped portion that can abut against the other open end surface of the pipe P2. That is, the joint pipe P2 is stably supported, and one end of the joint pipe P2 is formed so as to be able to reliably receive a certain amount of force. In addition, the specific shape, dimensions, material,
The specific shape (for example, a cone with a curved slope, a cone with a straight slope, etc.) and dimensions of the expansion protrusion 21 are based on the lance pipe P1 and the joint pipe P2. It can be freely set as appropriate depending on the shape, dimensions, etc.

And, the manufacturing method of the lance pipe P with a joint of the present invention is as follows:
First, a space closing packing 10 is attached to the base end portion of the inner pipe 2 of the lance pipe P1 so as to close the opening of the gap space 5 at the base end.
At the same time, the other end of the joint pipe P2 is fitted so that the tip of the joint receiver 20 is inserted, and the joint receiver 20 is held by an appropriate means (for example, gripped with an appropriate chuck). ), so that the joint pipe P2 is stably supported by the joint receiver 20 (see FIG. 1).

Then, the proximal end portion of the lance pipe P1 is force-fitted into one end of the joint pipe P2, and the lance pipe P1
The outer wall surface of the outer pipe 1 is brought into pressure contact with the inner wall surface of the joint pipe P2 (see FIG. 2).

Furthermore, this forced press-fitting is progressed to bring the outer wall surface of the outer pipe 1 of the lance pipe P1 into even stronger pressure contact with the inner wall surface of the joint pipe P2, and the plurality of metal wires 3 of the lance pipe P1 are expanded at the tip of the joint receiver 20. The metal wires 3 are brought into contact with the inclined surface of the inner tube 2 and gradually bent so as to expand in the radial direction. It is deformed so as to expand in diameter using a plurality of metal wires 3 (see Fig. 3). At this time, the inner tube 2 is greatly deformed only at the part where the metal wire 3 is in contact with it, and the base end of the metal wire 3 bites into the inner tube 2 (see Fig. 4), and the metal wires 3 and the inner tube 2 each deform. Mutual bonding is strengthened. Moreover, in the space closing packing 10, mainly the deformed portion of the inner tube 2 is brought into pressure contact with the inner wall surface of the outer tube 1 and the proximal end surface of the outer tube 1, so that the opening portion at the proximal end of the gap space 5 is appropriately elastically deformed. A lance pipe P with a joint is manufactured by closing the space with the space-closing packing 10 and fixing the joint pipe P2 to the lance pipe P1.

The means for forcibly press-fitting the lance pipe P1 into the joint pipe P2 includes, for example, a chuck capable of gripping the lance pipe P1 and a chuck capable of gripping the joint receiver 20, and these chucks are hydraulically operated. It is also possible to use a device that allows the parts to be brought close to each other using a force-fitting method, or other suitable forced press-fitting means can be used.

Further, the lance pipe P with a joint of the present invention manufactured by the method described above is a lance pipe P constructed as described above.
1, a joint pipe P2, and a space-closing packing 10. The joint pipe P2 is externally fitted and fixed to the base end of the lance pipe P1, and a gap space 5 at the base end of the lance pipe P1 is formed by the space-closing packing 10. 10.

That is, the space closing packing 10 is fitted onto the base end portion of the lance pipe P1, the outer wall surface of the outer tube 1 of the lance pipe P1 is brought into pressure contact with the inner wall surface of the joint pipe P2, and the base end portions of the plurality of metal wires 3 are each , the inner tube 2 is bent so as to expand in the radial direction, the proximal end portion of the inner tube 2 is expanded in diameter, the space closing packing 10 is pressed against the inner wall surface of the coupling pipe P2, and the proximal end surface of the outer tube 1 is bent. The gap space 5 provided between the inner wall surface of the outer tube 1 and the outer wall surface of the inner tube 2 is closed by a space closing packing 10 in a press-contact state.

(Effect of the invention) Therefore, the method for manufacturing the lance pipe P with a joint of the present invention is as follows:
An inner tube 2 is placed inside an outer tube 1 so that an appropriate gap space 5 is provided, and a plurality of metal wires 3 are inscribed in the inner wall surface of the inner tube 2, and adjacent metal wires 3 are circumscribed with each other to form a substantially annular shape. A lance pipe P1 is formed by arranging the inner tube 2 and the base end portion of the metal wire 3 to slightly protrude from the base end portion of the outer tube 1, and a space is closed at the base end portion of the inner tube 2 of the lance pipe P1. Fit the packing 10 on the outside, attach the joint receiver 20 to the other end of the joint pipe P2, forcibly press-fit the base end of the front lance pipe P1 to one end of the joint pipe P2, and then The outer wall surface of the outer pipe 1 of P1 is pressed against the inner wall surface of the joint pipe P2, and the plurality of metal wires 3 of the lance pipe P1 are attached to the inclined surface of the substantially conical expansion protrusion 21 provided at the tip of the joint receiver 20. Bring them into contact and gradually bend them to expand in the radial direction,
At the same time as this metal wire 3 is bent, the inner tube 2 is folded into a plurality of metal wires 3.
The space-closing packing 10 is pressed against the inner wall surface of the joint pipe P2, and the gap space 5 between the inner wall surface of the outer pipe 1 and the outer wall surface of the inner pipe 2 is closed with the space-closing packing 1o. , fitting pipe P2 to lance pipe P1
Therefore, when closing the gap space 5 of the lance pipe P1, there is no need to use a press machine, a roll machine, etc. that exerts a fairly strong crimping mechanism, and the plurality of metal wires 3 arranged in an annular manner can be closed. The arrangement state is disturbed or uneven, and the outer tube 1 and the inner tube 2 are also distorted.The state of oxygen flowing inside the inner tube 2 and its flow rate become constant and uniform. The combustion state in the circumferential direction of the lance pipe P1 becomes uniform without variation, and a stable combustion state can be obtained, making it possible to easily create the lance pipe P1 without the risk of impairing the original weld cutting ability. Moreover, it becomes possible to manufacture the product reliably.

In particular, when connecting the joint pipe P2, which is used when connecting a new lance pipe P1 to the lance pipe P1 which has become short due to combustion consumption and continuing work, to the base end of the lance pipe P1 in advance, this To easily and quickly produce a lance pipe P with a joint that can close the gap space 5 of the lance pipe P1 at the same time as the connection, moreover, close the gap space '5 of the lance pipe P1 reliably and quickly, and has high welding and drilling ability. become able to.

In addition, in the lance pipe P with a joint of the present invention, a plurality of metal wires 3 are arranged in a substantially annular shape in an inner tube 2 housed in an outer tube 1, and the proximal end portion of the inner tube 2 and the third metal wire is connected to the outer tube 1. The lance pipe P1 is formed to slightly protrude from the base end portion of the lance pipe P1, and the joint pipe P2 is externally fitted and fixed to the base end portion of the lance pipe P1. The space-closing gasket 10 is fitted onto the outside, and the lance pipe P1 is
The outer wall surface of the outer tube 1 is brought into pressure contact with the inner wall surface of the coupling pipe P2, and the proximal end portions of the plurality of metal wires 3 which are inscribed in the inner wall surface of the inner tube 2 and are arranged adjacent to each other in a substantially annular shape are radiated. At the same time, the base end portion of the inner tube 2 is bent to expand in the direction, and the base end portion of the inner tube 2 is expanded in diameter, and the space closing packing 10 is pressed against the inner wall surface of the joint pipe P2, so that the inner wall surface of the outer tube 1 and the inner tube 2
A gap space 5 provided between the outer wall surface and the space-closing gasket 1
Since it is configured to close at 0, it is easy to connect a new lance pipe P1 to the lance pipe P1 that has been shortened due to combustion consumption.It is easy to use, allows the welding and drilling work to continue smoothly, and has a fitting with high work efficiency. It becomes Lance Pipe P.

In particular, the outer wall surface of the outer pipe 1 of the lance pipe P1 is strongly pressed against the inner wall surface of the joint pipe P2, and each of the plurality of metal wires 3 of the lance pipe P1 is gradually bent so as to expand in the radial direction.
Since the inner tube 2 is deformed to expand its diameter by a plurality of metal wires 3, the inner tube 2 is greatly deformed only in the portion where the metal wires 3 are in contact, and the base end of the metal wire 3 is bent to the inner tube 2. This results in a biting state, and the bonding state between the metal wires 3 and the inner tube 2 becomes even stronger. That is, the metal wire 3 is reliably prevented from moving in the longitudinal direction with respect to the inner tube 2 or rotating about the longitudinal direction by the bent portion at the base end, so that an immobile state can be obtained. Moreover, since the space-occluding gasket 10 is pressed against the inner wall surface of the outer tube 1 mainly by the deformed portion of the inner tube 2, a force that presses against the proximal end surface of the outer tube 1 is also applied to the space-occluding gasket 10. As a result, the opening at the proximal end of the gap space 5 can be reliably closed with the space closing packing 10 which is appropriately elastically deformed.

[Brief explanation of the drawing]

The drawings illustrate the invention, and FIGS. 1 to 3 show
This figure shows the state in which the lance pipe is inserted into the pipe joint. Figure 1 is a longitudinal sectional front view of the main part before the lance pipe is forcibly fitted into the joint pipe, and Figure 2 shows the state in which the lance pipe is inserted into the joint receiver. Fig. 3 is a longitudinal sectional front view of the main part when the lance pipe is in contact with the expansion protrusion, Fig. 4 is a longitudinal sectional front view of the main part when the lance pipe is fixed to the pipe fitting, and Fig. 4 is a longitudinal sectional front view of the main part when the lance pipe is fixed to the pipe fitting. FIG. P...Lance pipe with fitting, Pl...Lance pipe, P2...Joint pipe, 1...Outer pipe, 2...Inner pipe, 3...Metal wire, 5...
・Gap space, 0... Space closing packing, 0... Joint receiver, 1... Expansion protrusion. Patent applicant: Fire Lance Industry Co., Ltd.

Claims (1)

[Claims] 1. An inner tube is placed inside the outer tube so that an appropriate gap space is provided, and a plurality of metal wires are inscribed in the inner wall surface of the inner tube, and adjacent metal wires are circumscribed to form a substantially annular shape. A lance pipe is formed by disposing the inner pipe and the proximal end portion of the metal wire slightly protruding from the proximal end portion of the outer pipe, and a space closing packing is externally fitted onto the proximal end portion of the inner pipe of the lance pipe. Attach a joint receiver to the other end of the joint pipe, force-fit the proximal end of the lance pipe to one end of the joint pipe, and press the outer wall of the lance pipe to the inner wall of the joint pipe. Then, the metal wires of the lance pipe are brought into contact with the inclined surface of the substantially conical expansion protrusion provided at the tip of the joint receiver, and gradually bent so as to expand in the radial direction. At the same time as the inner tube is bent, the inner tube is deformed to expand its diameter with a plurality of metal wires, and the space closing packing is pressed against the inner wall surface of the joint pipe, and the gap space between the inner wall surface of the outer tube and the outer wall surface of the inner tube is closed. A method for manufacturing a lance pipe with a fitting, characterized in that the lance pipe is closed with a sealing packing and the fitting pipe is fixed to the lance pipe. 2. A lance pipe that is formed by arranging a plurality of metal wires in a substantially annular shape in an inner tube that is housed in an outer tube, and making the base end portions of the inner tube and metal wires slightly protrude from the base end portion of the outer tube. , and a joint pipe that is fitted and fixed to the base end of the lance pipe, and a space-closing packing is externally fitted to the base end of the inner pipe of the lance pipe, and the outer wall surface of the outer pipe of the lance pipe is connected to the inner wall surface of the joint pipe. The proximal end portions of the plurality of metal wires, which are inscribed in the inner wall surface of the inner tube and arranged adjacent to each other in a substantially annular shape, are bent so as to expand in the radial direction. The diameter of the proximal end of the pipe is enlarged, and the space-closing packing is brought into pressure contact with the inner wall surface of the joint pipe, so that the gap space provided between the inner wall surface of the outer tube and the outer wall surface of the inner tube is closed by the space-closing packing. A lance pipe with a fitting.