Material suction device for a suction exchanger and suction exchanger comprising such a material suction device

Abstract

The invention relates to a material suction device with an articulated hose carrier (01) and a suction hose for a suction excavator (02). The articulated hose carrier (01) can be mounted by means of a proximal first end on the suction excavator by means of a rotationally movable fastening holder (03). At the second end of the distal end, the articulated hose carrier (01) comprises a suction collar (04) connected to a suction hose. The articulated hose carrier (01) comprises at least n > = 3 links (05) between which a hinge joint (06) having an associated drive (07) is formed. All the hinge joints (06) have the same degree of freedom such that the links (05) can be pivoted in a common plane (16). According to the invention, the material suction device further comprises a rotational joint (08) which is arranged between the last distal hinge joint (09) at which the suction sleeve is located and the first hinge joint. The rotational joint (08) has a different degree of freedom than the hinge joint (06), so that a link (05) arranged after the rotational joint (08) can be moved out of the plane. The invention further relates to a suction excavator (02) having a material suction device.

Description

Technical Field

[0001] The invention relates to a material suction device for mounting on a suction excavator, comprising an articulated hose carrier and a suction hose. The invention also relates to a suction excavator having a material suction device with an articulated hose carrier and a suction hose. Background Art

[0002] A suction excavator is a vehicle with a frame that carries a preferably tiltable material collection container. In a suitable embodiment, such a suction excavator has a telescopic device with two telescopic arms, whose container-side ends are respectively arranged on a tilting axis, about which the material collection container can be rotated, wherein the frame-side end of each telescopic arm is respectively arranged on the frame. Usually, a suction hose is arranged on the suction excavator with one end and has a suction socket at its other end, by means of which the material can be sucked. The sucked material is transported by the suction hose and introduced into the material collection container. It is well known that the suction hose has a larger diameter than a standard hose, for example, for pumping water or conveying liquid concrete. Known articulated hose carriers for suction excavators have variable-angle joints between the individual links, so that these links can be moved or rotated in a single plane. In addition, the articulated hose carrier can be allowed to rotate about a rotation point via a rotary drive, wherein the rotary drive forms a connection between the articulated hose carrier and the vehicle. The plane in which the articulated hose carrier extends can therefore be described by the axis of rotation of the rotary drive and the direction of swivel of the first link mounted on the rotary drive; this plane is usually perpendicular to the vehicle floor or frame. The connection is therefore a fastening retaining part that can be swiveled. This known arrangement results in a working range that is described by a cylindrical coordinate system. A typical articulated hose carrier for a suction excavator has a number n (preferably n ≥ 4) of links, between which there are joints, wherein angle changes can be achieved between the links by means of the associated drive. However, simple articulated hose carriers with fewer than four links are also possible.

[0003] The movement of one joint of the articulated hose carrier has an effect on the positioning of the other joints located upstream and the suction hose. Since the joints can only move in a single common plane, the individual links can collide with each other. This can be avoided by modern controls which limit the range of motion of the individual joints where necessary.

[0004] Known components or material suction devices on suction excavators have a limited working surface or a limited working range, because their components can only move in one plane. However, for suction excavators, in principle, a wide range of applications is preferred, because various locations need to be processed or various materials need to be suctioned freely. For example, it is necessary to suction lines that cross the ground at various locations freely, or to suck away building debris from buildings. In order to cover the required working range, it is sometimes necessary to change the positioning of the vehicle, wherein the maneuvering area on the construction site is usually set small or manual assistance by personnel with a shovel or similar tools is required. Therefore, for certain applications, a more flexible material suction device is desired, especially its articulated hose carrier with additional degrees of freedom.

[0005] EP 2 149 434 B1 describes a revolute joint and a revolute joint connection for an industrial robot. The revolute joint connection is arranged between the working device and the joint section and comprises a rotatable shaft section with a fluid transport path. The fluid transport path is formed by a hose path, which consists of two hoses that are loosely wound around the rotating section in a spiral shape at intervals. However, this supply hose is not suitable for suctioning coarse materials in terms of type and size.

[0006] DE 10 2007 063 408 A1 discloses a swivel joint for hose and / or pipe connections, which is used in particular in the pharmaceutical industry and through which a fluid is guided. However, this swivel joint cannot be used for transporting coarse materials, since it is susceptible to clogging and high wear due to its rigid design, the hose lengths required in suction excavators cannot be achieved, and the movement possibilities of the guided hose are severely restricted.

[0007] EP 3 705 662 A1 describes an articulated arm control for a concrete pump. The articulated arm consists of a rotating block and four segments, wherein the rotating block has a rotating joint that can be controlled by a hydraulic motor.

[0008] EP 0 166 800 A1 shows a head part for a movable or relatively fixed filling system, which includes a filling coupling and a pipeline. The pipeline is composed of five pipe fittings, which are respectively connected by a revolute joint with a unique degree of freedom. Three of the five revolute joints have parallel rotation axes. The other two revolute joints have rotation axes arranged perpendicular to the rotation axes of the above-mentioned three revolute joints. In addition, the head part also has another revolute joint at one end that serves as an interface on the filling system. Since the pipe fittings used are not flexible, the filling range is limited.

[0009] DE 10 2016 106 427 B3 describes a method for controlling the movement of an articulated hose carrier, which has at least three segments, wherein an angle change can be brought about between two adjacent segments by means of an associated drive.

[0010] US 3,495,878 A describes a pipe installation for pneumatically transporting bulk materials. The installation comprises a stationary pipe, a rotatable pipe (one end of which is rotatably connected to one end of the stationary pipe), and a flexible pipe unit (one end of which is connected to the other end of the rotatable pipe). A first drive device causes the rotatable pipe and the flexible pipe unit to rotate. A second drive device is configured to bend the flexible pipe unit, thereby causing a lifting movement.

[0011] DE 10 2018 004 334 A1 describes a suction excavator having a chassis and a superstructure arranged on the chassis. The superstructure comprises a suction pipe (Saugrüssel) for sucking up the suction material and a suction pipe arm having at least one arm link for supporting the suction pipe. The suction pipe arm can be swung around a first swivel axis extending parallel to the height axis of the suction excavator. The suction pipe arm is supported on a supporting element with its end facing the superstructure. The supporting element can be swung together with the suction pipe arm relative to the superstructure around a second swivel axis parallel to the longitudinal axis of the suction excavator, and can also be fixed together with the suction pipe arm in different swivel positions relative to the superstructure.

[0012] EP 3 399 108 B1 shows an articulated suction arm of a suction excavator. The suction arm comprises at least two parts defined in the same plane and articulated to each other along a first axis perpendicular to the plane in a swing connection. The two parts define a rear end and a front end. A base member is articulated with the rear end along a second axis perpendicular to the plane in the swing connection. A swing connection device is arranged on the base member so that the at least two parts swing along a third axis defined in the plane. The suction nozzle arranged in the area of ​​the front end is configured to be connected to the front end of the suction line. The suction nozzle defines a fourth axis, which is defined in a plane corresponding to the initial positioning. The suction arm comprises a tilting device, which is configured to change the orientation of the suction nozzle so that the fourth axis can be tilted to one side or the other side of the plane. An eccentrically arranged hydraulic cylinder is used as a tilting device, which can cause the fourth axis or the corresponding section of the suction arm to tilt by about 10°. Due to the selected structure, it is not possible to achieve a larger inclination, such as about 90°. Therefore, certain areas of the ground cannot still be reached by the suction nozzle. Summary of the invention

[0013] The object of the present invention is to provide a material suction device for a suction excavator which has an enlarged or better accessible working space without the risk of damaging the suction hose or reducing its diameter during the movement of the articulated hose carrier, so that a continuous material flow is maintained in any working position. In particular, in order to expand the range of use of the suction excavator, it should be possible to achieve a working position of the suction socket from different directions without the suction excavator having to change its position for this purpose.

[0014] This object is achieved according to the invention by a material suction device with an articulated hose carrier and a suction hose according to the appended claim 1 and by a suction excavator with a material suction device with an articulated hose carrier and a suction hose according to the appended claim 10 .

[0015] The material suction device according to the present invention comprises an articulated hose carrier and a suction hose, wherein the articulated hose carrier carries and guides the suction hose. During operation, the material suction device is mounted on a suction excavator so that the material can be transported to the container of the suction excavator via the suction hose. The negative pressure and suction airflow required for this purpose are generated by the fan unit of the suction excavator. The articulated hose carrier has a rotatable fastening and retaining portion at the first end, by means of which the articulated hose carrier can be mounted on the suction excavator. The fastening and retaining portion can be a swivel joint or a rotary joint with an axis of rotation. Usually, the axis of rotation of the fastening and retaining portion is perpendicular to the vehicle floor, wherein the fastening and retaining portion is usually fastened to the suction excavator backward in the direction of travel. The articulated hose carrier can be moved with the suction hose by means of the fastening and retaining portion. The material suction device comprises a suction socket at its other end, which is mounted on the distal end of the suction hose. The articulated hose carrier is composed of n segments, wherein n ≥ 3, particularly preferably n ≥ 4, between which articulated joints (hereinafter also referred to as joints) are respectively constructed. A drive is assigned to each articulated joint, wherein the drive is preferably operated hydraulically. Alternatively, an electric or pneumatic drive can be used. All joints have the same degrees of freedom, i.e. all segments of the articulated hose carrier can be moved or swiveled in a single common plane via these joints and their drives.

[0016] According to the present invention, the material suction device further comprises at least one swivel joint, which is arranged between the last (most distal) hinge joint on the link where the suction socket is located and the first hinge joint which is located closest to the fastening holding part that can rotate. In a preferred embodiment, the swivel joint is between the last hinge joint and the previous hinge joint, that is, between the two hinge joints which are farthest from the proximal end of the hinged hose carrier.

[0017] In a modified embodiment, the swivel joint is further equipped with one or two links in the direction of the proximal end of the articulated hose carrier, thereby increasing the range of motion of the suction socket, because multiple links can be moved out of the plane defined by the rotation axis of the fastening holder and the position of the second link.

[0018] In a further modified embodiment, two swivel joints can also be arranged on the articulated hose carrier. Thus, the articulated hose carrier can be guided, for example, around house corners or similar obstacles.

[0019] The swivel joint has a rotation axis, wherein the swivel joint has a degree of freedom different from the hinge joint, thereby allowing the links arranged after the swivel joint to move out of the plane of the remaining joints. In addition, the swivel joint has a continuous receiving opening along its axis, and the receiving opening has a cross-section that is larger than the cross-section of the suction hose. The suction hose is guided through the receiving opening. Therefore, the swivel joint is coaxially and concentrically assembled with the suction hose, that is, the rotation axis of the swivel joint extends in the receiving opening in line with the longitudinal axis of the suction hose. Therefore, the rotation carried out in the swivel joint is carried out around the longitudinal axis of the suction hose. In order to be able to implement the rotation without hindrance, the swivel joint must also be a component of the articulated hose carrier (integral supporting mechanism) that carries the load. Other (non-rotating) supporting elements cannot be guided over the swivel joint, because they will hinder the rotation.

[0020] Due to the structure of the material suction device described above, the suction hose can be moved by means of the articulated hose carrier and its hinge joints and swivel joints. Thus, at least one additional degree of freedom is achieved with the material suction device according to the invention, so that material can be sucked away by the suction excavator even outside the plane defined by the joints in conventional suction excavators, for example parallel to the direction of travel of the suction excavator.

[0021] Furthermore, the material suction device according to the invention has the advantage that, due to the at least one swivel joint and its additional degree of freedom compared to the other joints, a larger working range of the material suction device with the articulated hose carrier and the suction hose is possible.

[0022] With the material suction device according to the invention, it is advantageously possible to work in a larger working space without having to move the suction excavator to which the material suction device is fastened. The swivel joint allows for the first time to move all sections of the articulated hose carrier out of the common working plane. As a result, the range of motion of the articulated hose carrier has been qualitatively improved, so that it can be described entirely only by a cylindrical coordinate system, while conventional hose carriers can only move in a working space reflected by a Cartesian coordinate system. Therefore, it is possible to use it in narrow construction sites or similar places, and the suction excavator does not need to be so precise in the working range, because the working range is designed to be more flexible and spacious by the material suction device according to the invention. Similarly, manual assistance with a shovel or similar tools is not required. The material suction device can advantageously expose the lines, channels, tracks, etc. that need to be exposed from the side and below. Therefore, materials such as soil or debris can also be easily removed from intersecting lines or similar locations.

[0023] For an optimal mode of action or a large range of motion, the swivel joint should preferably be arranged in the kinematic chain formed by the articulated hose carrier and not at the suction-side end of the kinematic chain (suction socket).

[0024] Preferably, the swivel joint of the material suction device can be rotated by 90° to 190° in the negative and positive direction starting from the middle position. Preferably, the swivel joint can be rotated by at least 170° to 190° in the negative and positive direction. Particularly preferably, the swivel joint can be rotated by 190° in the negative and positive direction, so that a total rotation range of slightly more than 360° can be achieved. The middle position is usually located in the common plane of the articulated joint.

[0025] An electric drive can be constructed on the revolving joint. Particularly preferably, a hydraulic drive is arranged on the revolving joint. Other fluid-technical drives, such as pneumatic drives, are also conceivable. The hydraulic drive of the revolving joint preferably has a brake. The brake is closed in the normal state, especially in the case of energy failure or during transportation.

[0026] For the supply line of the hydraulic drive device and the joint and its hydraulic drive device thereafter, the revolving joint is constructed so that the supply line itself is not entangled or damaged. It should also be noted that the revolving joint itself is a component of the articulated hose carrier that carries the load. For this reason, the revolving joint includes at least two, preferably four hoses, and each hose has a deflection roller. The hose is coupled to the upstream and subsequent hydraulic supply lines by means of a connector. Preferably, the hose is arranged on one side of the revolving joint together. For example, the hose is connected to the first connector on the revolving joint, and extends from there to the deflection roller spaced apart from it, and returns to the second connector around the deflection roller. The first connector is firmly connected to the revolving joint and rotates with the revolving joint. The second connector is on an anti-rotational component indirectly arranged on the revolving joint. Therefore, the second connector forms an anti-rotational point. The second hose is arranged in the same way as the first hose in a mirror image. The deflection rollers are reversed and connected to each other in a 1:2 mode of action. At least two deflection rollers work together and are preferably connected to each other by elements, especially springs. The spring can be used to compensate for possible length errors caused by loading.

[0027] In an advantageous embodiment, a rotatable hose coupling is constructed on the swivel joint, which can also be referred to as a swivel flange or swivel flange tube. In the case of a rotatable hose coupling on the swivel joint, the suction hose is preferably constructed in two parts. The first part of the suction hose is bendable. The second part of the suction hose is bendable and twistable. As a result, the suction hose can move with the articulated hose carrier without breaking or excessive twisting, so that the internal cross section of the suction hose is not reduced or only slightly reduced so as not to hinder the flow of material.

[0028] Preferably, the clear cylindrical cross section inside the swivel joint can have a diameter of approximately 500 mm in order to allow a typical suction hose to be passed through.

[0029] In a preferred embodiment, the suction hose can be rotatably mounted on the suction excavator, in particular on the cover of the material collection container of the suction excavator. Particularly preferably, the suction hose is mounted on the material collection container by means of a swivel flange.

[0030] The suction excavator according to the invention comprises the aforementioned material suction device with an articulated hose carrier and a suction hose. The suction excavator as a vehicle also comprises a vehicle frame, a suction blower (fan unit) and a material collection container in which the sucked-up material can be collected and transported. The material is removed by means of a suction socket on the suction hose and transported to the material collection container via the suction hose. In addition, the suction excavator comprises a control unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Further details, advantages and improvements of the invention are apparent from the following description of preferred embodiments with reference to the accompanying drawings.

[0032] Figure 1 A perspective view showing a material suction device according to the invention mounted on a suction excavator in a swung-out working position;

[0033] Figure 2 Shown according to Figure 1 A top view of a material suction device;

[0034] Figure 3 shows a cross section of a revolute joint of a material suction device; and

[0035] Figure 4 Shown according to Figure 1 A perspective view of a material suction device on a suction excavator in a swiveled-in transport position. DETAILED DESCRIPTION

[0036] Figure 1 A perspective view of a material suction device according to the invention in a working position is shown, the material suction device having an articulated hose carrier 01 and (for the sake of simplicity only Figure 3 ) suction hose 10, wherein the material suction device is mounted on a suction excavator 02. The material suction device shown is moved out and is in a ready-to-operate state (working position). The articulated hose carrier 01 is rotatably mounted on the suction excavator 02 at a first proximal end by means of a rotatably movable fastening holder 03. By means of the fastening holder 03 having an axis of rotation, the articulated hose carrier 01 can be rotated about the axis of rotation, so that the articulated hose carrier 01 and the suction hose arranged thereon can be rotated from a rest position or transport position on the suction excavator 02 to a working position. The articulated hose carrier 01 has a suction socket 04 at its distal second end, on which the suction hose can be mounted, and the suction socket is used to remove and suck up material.

[0037] In the example shown, the articulated hose carrier 01 consists of five segments 05, between which are arranged mechanical articulated joints 06, each of which has a hydraulic drive 07. The articulated joints 06 can move like a hinge. All articulated joints 06 have the same degrees of freedom, so that the segments 05 can initially pivot in a common plane.

[0038] According to the invention, the material suction device further comprises a swivel joint 08 integrated in the articulated hose carrier 01. In the illustrated embodiment, the swivel joint 08 is located between the last distal articulation joint 09, which is farthest from the rotatable fastening holder (03) of the suction excavator, where the suction socket 04 is located, and the preceding articulation joint 11. Preferably, the swivel joint 08 is arranged directly on the preceding articulation joint 11 and can also form a structural unit with the preceding articulation joint. The swivel joint 08 can rotate about the axis of rotation and therefore has different degrees of freedom compared to the other articulation joints 06, 09, 11. The rotation of the swivel joint 08 about the axis of rotation with different degrees of freedom than the remaining articulation joints 06, 09, 11 can allow the link 05 arranged after the swivel joint 08 to move out of the plane of the other articulation joints. As a result, the range of motion of the articulated hose carrier 01 and thus the working range of the suction excavator 02 is extended by one degree of freedom and can also allow material to be removed from the side and below obstacles (for example, in the case of crossed pipes). The material suction device can therefore also allow suction excavation parallel to the travel direction of the suction excavator 02 .

[0039] The swivel joint 08 has a continuous receiving opening 12 whose cross section is larger than the cross section of the suction hose, so that the suction hose extends through the swivel joint 08. The suction hose can be mounted on the material collection container 14 of the suction excavator 02 by means of a flange 13, so that the removed material can be transported via the suction hose into the material collection container 14. The swivel joint 08 preferably has a hydraulic drive 20, but can also be operated with an electric drive, for example. In order to supply the drive, the material suction device includes a supply line 15, which is guided along the articulated hose carrier 01. The structure of the swivel joint 08 is Figure 3 Explained in detail.

[0040] Figure 2 Shown according to Figure 1 A top view of the material suction device. Figure 2 It can be seen that the suction socket 04 can be pivoted by means of the swivel joint 08 from a first plane 16 of the articulated hose carrier, in which the joints and links between the swivel joint and the suction excavator can move, into a second plane 17. Figure 2 In FIG. 1 , the suction socket 04 together with the last distal joint 09 and the link 05 located therebetween is pivoted by approximately 60°, so that the suction socket 04 can be moved parallel to the travel direction of the suction excavator 02 and, for example, in a trench A for suctioning material.

[0041] Figure 3The cross-sectional view of the rotary joint 08 of the material suction device is shown. The rotary joint 08 is designed as a component of the articulated hose carrier 01 so that the supply line 15 and the hydraulic hose 18 that connects the supply line 15 across the rotary joint 08 are not bent and are not entangled with each other when the rotary joint 08 rotates. The supply line 15 extends from the suction excavator 02 via the link 05 to the last distal end or the joint 09 that is located farthest from the suction excavator. The rotary joint 08 includes two hydraulic hoses 18 that are connected to the first connector 19 in a rotationally fixed manner at one end. The first connector 19 is arranged on the outer ring 21 at the outer periphery of the rotary joint 08, wherein the outer ring 21 of the rotary joint 08 is non-rotatable. The second ends of the two hydraulic hoses 18 are connected to the second connector 22 respectively. The second connector 22 is arranged on the rotatable inner ring 23 of the rotary joint 01. When the rotary joint 01 rotates, the rotating inner ring 23 rotates, wherein the rotation of the inner ring 23 is relative to the outer ring 21. In order to prevent the hoses from getting tangled with each other, the hoses are laid around deflection rollers 24. The two deflection rollers 24 are arranged on the inner ring 23 in a manner that allows for countermovement and are connected by means of springs 25, thereby compensating for possible length errors caused by installation. Figure 3 The swivel joint 08 comprises two hydraulic hoses 18, two first connectors 19, two second connectors 22 and two deflection rollers 24, wherein these components are arranged in a mirror-image manner in one plane. Due to the reversibility, the deflection roller 24 of the first hose 18 moves the same distance in the same direction as the second deflection roller 24 in the opposite direction around which the second hose 18 is wound. In a modified embodiment, multiple inverse systems can be arranged one after the other; for example, in our case, there are four hoses in the case of two systems. The inner radius of the swivel joint 08 forms a continuous receiving opening 12 for the suction hose 10, which is twisted by means of the swivel joint 08, wherein excessive twisting of the suction hose can be avoided, for example, by limiting the rotation of the swivel joint 08 or by designing the suction hose in two parts using a swivel coupling. Figure 3 It can also be clearly seen in FIG. 1 that the axis of rotation of the swivel joint extends along the longitudinal axis of the suction hose 10 . The swivel joint 08 is therefore arranged coaxially and concentrically with the suction hose in the region of the receiving opening 12 .

[0042] Figure 4 Shown according to Figure 1A perspective view of a material suction device in the transport position on a suction excavator 02. In the transport position, the material suction device is arranged on the rear side of the suction excavator 02. In this position, the material suction device with the articulated hose carrier 01 is pivoted approximately at a right angle in the joint and thus "wound up in a spiral shape", and the swivel joint 08 is twisted in such a way that collisions of elements of the material suction device, in particular the suction socket 04, with other components are avoided.

[0043] Reference numerals list

[0044] 01 Articulated Hose Carrier

[0045] 02 Suction Excavator

[0046] 03 Fastening and retaining part capable of rotational movement

[0047] 04 Suction socket

[0048] 05 Session

[0049] 06 Hinge joint

[0050] 07 Hydraulic drive device

[0051] 08 Rotational joints

[0052] 09 The last distal hinge joint

[0053] 10 Suction hose

[0054] 11 Previous hinge joint

[0055] 12 Continuous receiving opening

[0056] 13 Flange

[0057] 14 Material collection container

[0058] 15 Supply lines

[0059] 16 First plane

[0060] 17 Second Plane

[0061] 18 Hydraulic hose

[0062] 19 First Connector

[0063] 20 Driving device of rotating joint 08

[0064] 21 Outer ring of rotating joint 08

[0065] 22 Second connector

[0066] 23 Inner ring of rotating joint 08

[0067] 24 Deflection roller

[0068] 25 Spring

[0069] A trench parallel to the direction of travel

Claims

1. A material extraction device for a suction excavator (02) having an articulated hose carrier (01) and a suction hose, wherein: The articulated hose carrier (01) has a rotatable fastening retaining portion (03) at a first proximal end and a suction socket (04) connected to the suction hose at a second distal end, and wherein the articulated hose carrier (01) has a number n ≥ 3 links (05), between which hinge joints (06) are respectively constructed, and the hinge joints each have an associated drive device (07), wherein all hinge joints (06) have the same degree of freedom, so that the links (05) can pivot in a common plane (16), characterized in that the material suction device also includes a swivel joint (08), which has a continuous receiving opening (12) along its rotation axis with a cross-section larger than the cross-section of the suction hose, wherein the swivel joint (08) is arranged A positioning point between a last distal hinge joint (09) farthest from the fastening retaining part (03) and a first hinge joint closest to the rotatable fastening retaining part, wherein the swivel joint (08) has different degrees of freedom from the hinge joint (06), thereby allowing a link (05) arranged distally after the swivel joint (08) to move out of the plane, wherein the suction hose is guided through a receiving opening (12) of the swivel joint, so that the swivel joint (08) is arranged coaxially with the suction hose.

2. The material suction device according to claim 1, characterized in that: The number of the links (05) is n ≥ 4.

3. The material suction device according to claim 1 or 2, characterized in that: The swivel joint (08) is arranged between the two hinge joints which are farthest from the proximal end of the articulated hose carrier.

4. The material suction device according to any one of claims 1 to 3, characterized in that: The rotary joint (08) has a fluid or electric drive (20).

5. The material suction device according to any one of claims 1 to 4, characterized in that: The rotatably movable fastening and holding part (03) is a further rotary joint or a swivel joint, wherein the fastening and holding part (03) can be mounted on the suction excavator (02).

6. The material suction device according to any one of claims 1 to 5, characterized in that: A rotatable hose coupling is inserted into the swivel joint (08).

7. The material suction device according to claim 6, characterized in that: In the case of a twistable hose coupling, the suction hose is composed of two parts, wherein a first part of the suction hose is bendable and wherein a second part of the suction hose is bendable and twistable.

8. The material suction device according to any one of claims 1 to 7, characterized in that: The swivel joint (08) comprises at least two hoses (18), and each hose (18) has a deflection roller (24).

9. The material suction device according to claim 8, characterized in that: The deflecting rollers (24) acting in opposite directions are coupled to one another via spring elements.

10. A suction excavator (02) having a material suction device with an articulated hose carrier (01) and a suction hose according to any one of claims 1 to 9, further comprising a material collection container (14).

11. The suction excavator (02) according to claim 10, characterized in that: The suction hose is rotatably arranged on a material collection container (14) of the suction excavator (02).

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