DE202021103868U1 - Delivery pipe - Google Patents

Abstract

Conveyor pipe (1) for the transport of granular solids, the conveying pipe (1) having an inlet and outlet opening (7, 8) for the solids and a vibration drive (9) acting on the wall of the conveying pipe for generating vibrations and on the inside with a the inlet and outlet opening (7, 8) is provided connecting the elastic lining hose (3) through which the solids can be guided, an intermediate space (4) being defined between the lining hose (3) and in the conveyor pipe (1) and the conveyor pipe (1) has at least one opening (5) communicating with the interspace (4), characterized in that the interspace (4) can be evacuated via the opening (5), the lining tube (3) being elastically expanded to the inside of the delivery pipe ( 2) can be applied and the vibrations generated by the vibration drive in the conveyor pipe are transmitted to the adjacent lining hose and the solids contained therein can be used and the space (4) can be temporarily ventilated for cleaning the lining tube (3) so that the lining tube (3) can be lifted elastically from the inside of the conveyor pipe (2) and transferred to its de-energized state while reducing its diameter.

Description

The invention relates to a conveying pipe for transporting granular solids, the conveying pipe having an inlet and outlet opening for the solids and a vibration drive acting on the wall of the conveying pipe and being provided on the inside with an elastic lining hose connecting the inlet and outlet opening through which the Solids can be guided, an intermediate space being defined between the lining tube and the delivery pipe and the delivery pipe having at least one opening communicating with the intermediate space.

Delivery pipes of the type mentioned are generally used for the delivery of granular solids, such as crushed stone, sand, coal, graphite powder, gravel, rubble or building material.

On the one hand, conveyor pipes are known which are excited to vibrate from the outside and, if necessary, are inclined axially in one direction, so that there is a gradient. The granular solid is set in motion by the vibration and follows the direction given by the conveyor pipe.

On the other hand, there are delivery pipes that are equipped with a lining hose attached to the inside. The lining hose and the inner wall of the conveyor pipe enclose a closed space. A connection opens into the intermediate space, which serves to vary the pressure in the intermediate space, in particular by means of pressure surges. The liner tube and the granular solids carried in the liner tube are set in motion by periodic changes in pressure of the gas in the gap. The granular solids are thus transported in a direction defined by the conveyor pipe.

Depending on the type of granular solids, deposits can form on the inside of the conveyor pipe. In industrial applications, for example the conveyance of pitch-containing powders, deposits lead to problems that can be remedied by replacing conveyor pipes that have become unusable or by cleaning. In conveyor operation, deposits can lead to increased wear and tear and a loss of efficiency during transport.

Solutions for removing deposits are known from the prior art for conveyor pipes with a lining hose.

the DE 39 10 796 A1 describes conveying pipes with a lining hose for conveying building material. The delivery pipe contains a liner that can be cleaned during operation. An inflatable body is integrated between the conveying hose and the pipe wall, which acts against the outer wall of the hose and acts on the flexible inner wall in such a way that it bulges.

the U.S. 2,78,326 describes a conveyor pipe for transporting hard coal. Here, too, a flexible inner hose is used, which is surrounded by a rigid pipe. Gas is fed into the space between the rigid pipeline and the inner hose with pressure. The coal can be transported by blasts of compressed air and it can be prevented from being deposited on the inner hose.

the EP 2 810 899 A1 describes a container for liquid media loaded with solids, in particular liquids, and a method for removing deposits in liquid containers. Here, too, an intermediate space, which lies between the container wall and a covering lining tube, is used to remove deposits by means of a blast of compressed air.

Previously known methods by means of an inner hose that covers the inner wall of the conveyor pipe do not offer a solution for the type of conveyor pipe that is equipped with a vibration drive. The previous methods provide that the space between the inner wall of the delivery pipe and the lining hose is under pressure during the delivery process, as a result of which a damping layer of air is formed in the space. As a result, no vibration-induced transport can take place.

From the DE 202 21 50045 U1 A device is known for transferring a granular material to be conveyed from a storage container into an open and closable receiving space, the receiving space comprising an interior perforated wall through which a negative pressure can be exerted from the outside on the receiving space, which is closed by means of a flap, in order to exclude the conveyed material sucking into a storage container, which is retained on the perforated wall. After the suction process is complete, the flap is opened and, instead of the negative pressure in the opposite direction, overpressure is exerted on the perforated wall from the outside, whereby the sucked-in conveyed material is blown off the perforated wall and discharged from the device via the opened flap. In this respect, it is an intermittent suction and blow-out process, which is not suitable for sensitive conveyed goods that tend to clump.

The present invention is based on the object of developing a delivery pipe that has a vibration drive so that a reliable conveyance and easy cleaning can be achieved.

According to the invention, it is provided that the gap can be evacuated via the opening and the lining tube can be placed against the inside of the conveyor pipe with elastic expansion thereof and that the gap can be temporarily ventilated for cleaning the lining hose, so that the lining hose can be lifted elastically from the inside of the conveyor pipe.

Advantageous configurations and developments of the invention are the subject matter of the dependent claims.

According to the invention, it is thus possible to minimize the gap during operation of the conveyor pipe or - which is preferred in this respect - to eliminate it completely, the lining tube in which the granular solids are to be conveyed comes to rest on the inner surface of the conveyor pipe. The vibrations generated by the vibration drive in the delivery pipe are thus transmitted almost undamped to the adjacent lining hose and the solids contained therein. The desired vibration-related conveyance can thus take place through the conveying pipe.

If deposits settle in the lining hose during operation, the space is briefly and temporarily ventilated so that the lining hose is elastically reset and lifts off the inside of the delivery pipe. The deposits are reliably broken up. After the gap has been evacuated again, the broken deposits are then removed by vibration together with the other granulated solids.

According to a proposal of the invention, the lining hose can be designed in such a way that it can be placed over the entire surface of the inside of the conveying pipe, thereby optimizing the conveying effect.

According to a further embodiment, the lining tube can be made from a rubber-elastic material based on natural or synthetic rubber.

According to a further embodiment, the lining hose is folded over and fixed in the area of the inlet and outlet opening to the outside of the conveyor pipe, for example by means of suitable hose clamps.

According to a further embodiment, the inlet and / or outlet opening of the conveying pipe is formed by a connecting piece opening at an angle into the conveying pipe, and the lining tube has a lining nozzle that corresponds thereto.

According to a further embodiment, a tissue is present in the space. The fabric is positioned between the delivery pipe and the lining hose. The fabric prevents the opening through which the intermediate space is evacuated from being closed by preventing the opening from being clogged by the fabric, for example by the lining tube that has been sucked in. The fabric favors the complete application of the lining hose to the inside of the delivery pipe and thus prevents the opening from being blocked. The fabric has, for example, a thickness of 0.8 mm and is preferably made of polyester or a polyolefin, but can also be made of other plastics or natural fibers. In the context of the invention, such a fabric can also be formed from a corresponding fabric.

The conveying pipe can be used, for example, for conveying powders containing pitch, sand, gravel or building material, but is also suitable for all other types of free-flowing bulk materials.

• 1 ein Ausführungsbeispiel des Förderrohrs;
• 2 ein weiteres Ausführungsbeispiel des Förderrohrs mit evakuiertem Zwischenraum;
• 3 das Förderrohr gemäß 2 mit belüftetem Zwischenraum.

Further advantageous refinements and details of the invention are explained below with reference to the drawing showing an exemplary embodiment. Show it:

• 1 an embodiment of the conveyor pipe;
• 2 a further embodiment of the delivery pipe with evacuated space;
• 3 the delivery pipe according to 2 with ventilated space.

1 shows an embodiment of a conveyor pipe 1 .. The delivery pipe consists of a rigid steel pipe 12th with a round cross-section and a suitable length and diameter-dependent pipe wall thickness. The delivery pipe has an inlet opening 7th and an exit port 8th on that as a connecting piece at an angle of 90 ° to the longitudinal axis of the conveyor pipe 1 flow into this. The front pipe ends 10 , 11th are by means of sealing caps 6th locked. A vibratory drive 9 is with the outer wall of the rigid steel pipe 12th coupled and brings the rigid steel pipe 12th holistic to vibration. An oscillating conveyor is used as a vibration drive, which causes the rigid steel pipe to vibrate. The sealing caps 6th are made, for example, of plastic and designed in the form of a sealing cap that extends over the respective pipe end 10 , 11th everted and with the rigid steel tube 12th connected. Furthermore, the delivery pipe has an inner wall of the delivery pipe 2 and a liner tube 3 on that an enclosed space 4th lock in. the Liner tube 3 consists of rubber-elastic material, e.g. based on natural or synthetic rubber, and has rubber-elastic material properties. In addition, the liner tube has 3 in the de-energized state has a smaller diameter than the rigid steel pipe 12th . This creates the space between the lining hose and the rigid steel pipe 4th , the cross-section of which is approximately ring-shaped. The lining tube 3 is in the area of the pipe ends 10 and 11th to the outside of the conveyor pipe 1 turned over and fixed. The fixation is done by gluing the lining tube 3 with the steel pipe 12th or realized by hose clamps. The fixation is airtight. The lining tube 3 has a corresponding liner for the inlet opening 7th and outlet opening 8th on. The lining tube is accordingly 3 in the area of the inlet and outlet openings 7th , 8th to the outside of the conveyor pipe 1 turned over and fixed.

Three openings 5 open from the outside into the space in between 4th and serve to evacuate and ventilate the space 4th . At the openings 5 is connected to a suction device, which in the present 1 is not shown. The suction device can use the space 4th evacuate so that there is no air in the space 4th is present. The space in between is used to transport bulk goods 4th over the openings 5 evacuated. The lining tube 3 lies with elastic expansion of the same on the inside of the delivery pipe 2 on and the vibration of the rigid steel pipe 12th plants itself on the lining tube 3 away. The bulk material is in the entrance opening 7th entered and moves on the liner tube 3 due to the vibration and gravity in the direction of the outlet opening 8th .

A cleaning process can be initiated at certain time intervals, whereby the gap 4th over the openings 5 is ventilated so that the liner tube 3 elastic from the inside of the delivery pipe 2 lifts off and due to the elastic deformation of the liner tube 3 deposits are detached. The elastic deformation takes place because of the liner tube 3 passes into the tension-free state due to the ventilation of the gap and the hose diameter becomes smaller than the pipe diameter of the rigid steel pipe 12th . The deposits can be lumps, layers, dust or brittle crusts that have arisen from the transport of the bulk material. After ventilation, the space in between 4th again over the openings 5 evacuated. The cleaning process can cover several periodic cycles of ventilation and evacuation.

the 2 and 3 show a further embodiment of the conveyor pipe 1 . The difference to the above-mentioned embodiment according to 1 is the design of the inlet and outlet openings. The first end of the pipe is used for this 10 as an entrance opening 7th . The second end of the pipe 11th serves as an outlet opening 8th . The lining tube 3 is folded over and fixed in the area of the inlet and outlet opening to the outside of the conveyor pipe.

In the representation according to 3 is the space in between 4th ventilated and a fabric 13th is in the space between the delivery pipe 1 and liner tube 3 positioned. The mesh 13th is like the lining tube 3 folded over and fixed in the area of the inlet and outlet opening to the outside of the conveyor pipe.

In the representation according to 2 is the space in between 4th evacuated. The lining tube 3 is thus under elastic expansion of the same on the inside of the delivery pipe 2 and there may be a pumping of granular solids through the liner bag 3 done by means of vibration. The mesh 13th favors the complete application of the liner tube 3 to the inside of the delivery pipe 2 .

3 shows the cleaning status of the liner tube 3 . The space in between is used for this 4th temporarily ventilated so that the liner tube 3 elastic from the inside of the delivery pipe 2 takes off. The deformation of the liner tube 3 leads to detachment of the liner tube 3 any deposits.

List of reference symbols

1

Delivery pipe

2

Conveyor pipe inner wall

3

Liner tube

4th

Space

5

opening

6th

Cap

7th

Inlet opening

8th

Outlet opening

9

Vibration drive

10

First pipe end

11th

Second pipe end

12th

Rigid steel pipe

13th

tissue

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 3910796 A1 [0007]
• US 278326 [0008]
• EP 2810899 A1 [0009]
• DE 2022150045 U1 [0011]

Claims (7)

Conveyor pipe (1) for the transport of granular solids, the conveying pipe (1) having an inlet and outlet opening (7, 8) for the solids and a vibration drive (9) acting on the wall of the conveying pipe for generating vibrations and on the inside with a the inlet and outlet opening (7, 8) is provided connecting the elastic lining hose (3) through which the solids can be guided, an intermediate space (4) being defined between the lining hose (3) and in the conveyor pipe (1) and the conveyor pipe (1) has at least one opening (5) communicating with the interspace (4), characterized in that the interspace (4) can be evacuated via the opening (5), the lining tube (3) being elastically expanded to the inside of the delivery pipe ( 2) can be applied and the vibrations generated by the vibration drive in the conveyor pipe are transmitted to the adjacent lining hose and the solids contained therein can be protruded and the space (4) can be temporarily ventilated for cleaning the lining hose (3) so that the lining hose (3) can be lifted elastically from the inside of the conveyor pipe (2) and can be transferred to its de-energized state while reducing its diameter. Delivery pipe (1) Claim 1 , characterized in that the lining hose (3) can be placed over the entire surface of the inner side of the conveyor pipe (2). Conveyor pipe (1) according to one of the preceding claims, characterized in that the lining tube (3) is made from a rubber-elastic material based on natural or synthetic rubber. Conveyor pipe (1) according to one of the preceding claims, characterized in that the lining hose (3) is folded over and fixed in the area of the inlet and outlet opening (7, 8) to the outside of the conveyor pipe (1). Conveyor pipe (1) according to one of the preceding claims, characterized in that the inlet opening (7) and / or the outlet opening (8) is formed by a connecting piece opening into the conveying pipe (1) at an angle, and the lining tube (3) has a corresponding lining piece having. Conveyor pipe (1) according to one of the preceding claims, characterized in that a fabric (13) is arranged in the intermediate space (4). Use of a conveying pipe (1) according to one of the preceding claims for conveying pitch-containing powder, sand, gravel or building material.

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