Steam cleaning machine with waste water discharge

Abstract

The utility model provides a steam cleaning machine with waste water discharging function, which comprises a steam shell with a water feeding port and a steam outlet port; a steam boiler is arranged in the steam shell and is communicated with the water feeding port and the steam outlet port through pipelines respectively; a floor support member is arranged, and a bottom space is formed between the bottom of the floor support member and the bottom of the steam shell; the bottom of the steam boiler is provided with a waste water discharge port, the bottom of the steam shell is provided with a bottom opening, and the waste water discharge port is opposite to the bottom opening; and a bottom cover is detachably connected to the waste water discharge port through the bottom opening. The steam cleaning machine with waste water discharging function has the advantages of simple waste water discharging operation, reliable sealing performance, stable structure and convenient movement.

Description

Technical Field

[0001] This utility model relates to the field of cleaning equipment technology, specifically to a structural improvement of a steam cleaner, and more particularly to a steam cleaner with a wastewater discharge function. Background Technology

[0002] Steam cleaners are widely used in household and commercial cleaning applications due to the cleaning power of high-temperature steam. Their core component is a steam boiler, which heats water to generate high-temperature steam, which is then delivered to the cleaning nozzles through the steam outlet to perform the cleaning operation. For example, prior art, see patent document CN100560226C, discloses a steam cleaner having a housing that surrounds a steam generator having an electrically heated steam boiler for generating steam that can be applied to a surface to be cleaned, wherein the housing has two housing halves that can be assembled together. To improve the steam cleaner so that it can economically meet the requirement of reliable splash protection, according to the present invention, the housing incorporates a protective shield extending between the two housing halves, which covers the steam boiler.

[0003] However, after use, existing steam cleaners often leave unevaporated wastewater inside the steam boiler. If this wastewater remains for a long time, it can easily lead to scaling and corrosion on the inner wall of the boiler, shortening the service life of the equipment. At the same time, existing steam cleaners generally lack convenient and reliable wastewater discharge structures: some products do not have a dedicated wastewater discharge port, requiring disassembly of the equipment shell to empty the wastewater, which is cumbersome; some products have a wastewater discharge structure, but the discharge port is hidden, difficult to disassemble, and has poor sealing performance, which can easily lead to water leakage during use, seriously affecting the user experience.

[0004] Therefore, there is an urgent need for a steam cleaner structure that is convenient for waste discharge and has reliable sealing to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing steam cleaners, such as inconvenient wastewater discharge, poor sealing, and insufficient structural stability, and to provide a steam cleaner with wastewater discharge function that is simple to operate, has reliable sealing performance, a stable structure, and is easy to move.

[0006] The technical solution of this utility model to solve its technical problem is: a steam cleaner with wastewater discharge function, comprising: A steam casing having a water inlet port and a steam outlet port; A steam boiler is installed inside a steam shell, and the steam boiler is connected to the water inlet port and the steam outlet port respectively through pipelines; It also includes: A ground support component, wherein a bottom space is formed between the bottom of the ground support component and the bottom of the steam shell; The bottom of the steam boiler has a wastewater discharge port, and the bottom of the steam shell has a bottom opening, with the wastewater discharge port directly facing the bottom opening. The bottom cover is detachably connected to the wastewater outlet after passing through the bottom opening.

[0007] Preferably, the bottom cover is at least partially located within the bottom space.

[0008] Preferably, the bottom of the steam shell is recessed upward to form a groove region, the bottom opening is disposed in the groove region, and the bottom cover is at least partially located in the groove region.

[0009] Preferably, the bottom of the steam boiler is arranged to gradually slope downwards from the point away from the wastewater outlet towards the point closer to the wastewater outlet.

[0010] In some preferred embodiments of this utility model, the inner edge of the wastewater outlet extends downward to form a vertical section, the vertical section extends into the bottom opening of the steam shell, and a sealing element is provided between the outer wall of the vertical section and the inner wall of the bottom opening.

[0011] Optionally, an internally threaded pipe joint is provided in the vertical section, and the bottom cover is threadedly connected to the internally threaded pipe joint.

[0012] Specifically, the bottom cover includes an integrally formed external thread section and a screw cap section, and the junction of the screw cap section and the external thread section extends outward to form a stepped groove, in which a sealing ring is provided. When the bottom cover is connected to the internal threaded pipe joint, the sealing rings abut against the junction of the external thread section and the internal threaded pipe joint, and the junction of the internal threaded pipe joint and the vertical section, respectively.

[0013] In some preferred embodiments of this utility model, a support frame is provided inside the steam shell, the steam boiler is connected to the support frame by a first fastener, and the support frame is connected to the steam shell by a second fastener.

[0014] Furthermore, a wiring space is formed between the support frame and the bottom surface of the steam shell, and a through hole is provided on the support frame. The steam boiler has a heating tube, and at least part of the heating tube enters the wiring space after passing through the through hole. The first fastener is in an inverted position, and the second fastener is in a forward position.

[0015] Optionally, the ground support component is a roller.

[0016] The process of using this utility model: Water replenishment: Release the water inlet port, add an appropriate amount of clean water into the steam boiler, and then close the water inlet port; Cleaning: When the power is turned on, the heating element heats up to generate steam, which is then delivered to the cleaning nozzle through the steam outlet for cleaning. Waste discharge: After cleaning is completed and the steam boiler has cooled down, release the brake on the rollers and move the equipment to the drainage position; the user reaches into the bottom space, rotates the screw cap section of the bottom cover, removes the bottom cover, and the wastewater is discharged through the wastewater outlet and bottom opening under the tilting action of the bottom of the boiler; Reset: After the waste is discharged, reconnect the bottom cover threaded connection back to the internal threaded pipe joint until the sealing ring is tightly against the seal, thus completing the reset.

[0017] The beneficial effects of this utility model are as follows: 1. Convenient waste discharge: The bottom operating space is formed by the ground support components, and the wastewater outlet is set directly opposite the bottom opening. The bottom cover can be detached and connected, so users can quickly start the waste discharge without disassembling the equipment shell. The operation is simple. The inclined design of the bottom of the steam boiler can ensure that the wastewater is completely collected and discharged to avoid residue.

[0018] 2. Reliable sealing: The seal between the vertical section and the bottom opening, and the sealing ring in the bottom cover step groove form a double sealing structure, which effectively prevents steam or wastewater leakage and improves equipment safety and service life.

[0019] 3. Stable structure: The support frame is connected to the steam boiler and the steam shell by fasteners set in opposite directions. The connection is firm and the layout is reasonable to avoid loosening of parts; the wiring space is designed to facilitate the wiring of heating pipes and does not affect the installation of other components.

[0020] IV. Flexible Use: The omnidirectional casters serve as a floor support component, creating both a bottom operating space and facilitating flexible movement of the equipment, making them suitable for various cleaning scenarios. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0022] Figure 2 This is a schematic diagram of the bottom structure of this utility model.

[0023] Figure 3 This is a partial structural disassembly diagram of this utility model.

[0024] Figure 4 This is a cross-sectional view of the present invention.

[0025] Figure 5 This is an enlarged schematic diagram of part A in this utility model.

[0026] Figure 6 This is a schematic diagram of the internal structure of this utility model.

[0027] Figure 7 This is a schematic diagram of the supporting skeleton.

[0028] Figure 8 This is a schematic diagram of the present invention during wastewater discharge.

[0029] In the diagram: 1. Steam shell; 11. Water inlet port; 12. Steam outlet port; 13. Bottom opening; 14. Groove area; 2. Steam boiler; 21. Wastewater outlet; 211. Vertical section; 22. Seal; 23. Internal threaded pipe joint; 24. Heating pipe; 3. Ground support component; 31. Front caster wheel; 32. Rear directional wheel; 4. Bottom space; 5. Bottom cover; 51. External threaded section; 52. Screw cap section; 53. Step groove; 531. Sealing ring; 6. Support frame; 61. First fastener; 62. Second fastener; 63. Through hole; 7. Wiring space. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments are merely specific descriptions of the present invention, and their purpose is to enable those skilled in the art to better understand the technical solution of the present invention, and should not be regarded as limitations on the present invention.

[0031] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example

[0033] Reference Figures 1 to 8 A steam cleaner with wastewater discharge function includes: a steam housing 1 having a water inlet port 11 and a steam outlet port 12; a steam boiler 2 disposed inside the steam housing 1 and connected to the water inlet port 11 and the steam outlet port 12 respectively via pipelines; a floor support member 3, with a bottom space 4 formed between the bottom of the floor support member 3 and the bottom of the steam housing 1; a wastewater outlet 21 at the bottom of the steam boiler 2 and a bottom opening 13 at the bottom of the steam housing 1, with the wastewater outlet 21 facing the bottom opening 13; and a bottom cover 5 detachably connected to the wastewater outlet 21 after passing through the bottom opening 13.

[0034] The above content constitutes the basic structural scheme of this utility model, and its main structural design concepts are as follows: I. Integrated Layout of Steam Boiler 2 and Steam Shell 1: Steam boiler 2 is completely built into steam shell 1, connected to water inlet port 11 and steam outlet port 12 via pipelines, forming a closed steam circulation system. This layout ensures both steam generation efficiency and thermal insulation protection through the shell. The wastewater outlet 21 at the bottom of steam boiler 2 is precisely aligned with the bottom opening 13 of the shell, forming a straight drainage channel to prevent wastewater from stagnating inside the equipment.

[0035] II. Functional Synergy of Ground Support and Bottom Space 4: The bottom space 4 between the ground support component 3 and the bottom of the steam shell 1 not only provides physical space for drainage operations but also optimizes the stability of the equipment's center of gravity. This space can accommodate a water collection container, and together with the removable bottom cover 5, it facilitates wastewater collection. For example, in industrial scenarios, users can directly place the water collection tray in the bottom space 4 and quickly drain the condensate or residual dirt from the boiler by opening the cover.

[0036] III. Sealing and Maintenance Mechanism of the Removable Cover: The bottom cover 5 is detachably connected to the wastewater outlet 21 via a threaded or snap-fit ​​structure. This design ensures sealing during daily use (preventing steam leakage) and facilitates regular maintenance. For example, when scale buildup inside the boiler affects performance, the user can unscrew the cover for chemical descaling or mechanical cleaning. In some embodiments, a rubber sealing ring 531 may be provided between the cover and the wastewater outlet 21 to further improve sealing performance.

[0037] Based on the above structural design, the advantages of this utility model are at least as follows: 1. Breakthrough in drainage efficiency and ease of maintenance: Traditional steam cleaners typically rely on side or top valves for wastewater discharge, which limits operating space and easily leaves residue. This design, however, uses a bottom-through opening to drain wastewater from the boiler within seconds, making it particularly suitable for areas with hard water and rapid scale formation. 2. Dual protection against clogging and leakage: The wastewater outlet 21, combined with the gravity drainage of the bottom space 4, effectively prevents scale or impurities from clogging the system. Simultaneously, the removable cover's sealing design (such as using O-rings or conical seals) avoids the leakage problems caused by spring corrosion in traditional one-way valves.

[0038] Preferably, refer to Figure 2 The bottom cover 5 is at least partially located within the bottom space 4. The positioning of the bottom cover 5 serves two purposes: First, it reduces external protrusions. If the cover were completely outside the casing, it would be easily damaged or detached due to equipment movement or collisions. Partially located within the bottom space 4, the main structure of the cover is concealed within the reserved space at the bottom of the equipment, with only a small portion of the operating parts exposed, resulting in a simpler overall appearance and reducing the risk of bumps and knocks during transportation and use. Second, it provides guidance for installation / disassembly. The bottom space 4 provides a natural positioning boundary for the cover, eliminating the need for repeated alignment of the wastewater outlet 21 during disassembly. Users can simply push the cover along the contour of the bottom space 4 for quick connection. Especially in low-light environments, the physical boundary of the bottom space 4 assists users in blind operation, improving maintenance efficiency. Third, it prevents impurities from entering. The semi-enclosed environment formed by the bottom space 4 can prevent dust, water stains, and foreign objects from directly contacting the sealing surface of the cover and the wastewater outlet 21, reducing the risk of wear or blockage of the seal 22. Fourth, the sealing pressure is more stable: if the cover is completely suspended, the pressure inside the steam boiler 2 may cause slight deformation of the cover, affecting the seal. When part of it is located in the bottom space 4, the non-sealed end of the cover can rely on the inner wall of the bottom space 4 to form auxiliary support, preventing the cover from shifting due to pressure and ensuring that the sealing surface fits tightly.

[0039] Preferably, refer to Figure 2The bottom of the steam housing 1 is recessed upwards to form a groove region 14. The bottom opening 13 is disposed in the groove region 14, and the bottom cover 5 is at least partially located in the groove region 14. The inner wall contour of the groove region 14 can precisely match the shape of the bottom cover 5, forming a guide effect of insertion and alignment. When installing the cover, the user does not need to visually align the bottom opening 13; simply push the cover along the inner wall of the groove, and the shape and position constraints of the groove will automatically align it with the wastewater outlet 21. On the other hand, the groove region 14 is recessed upwards, and its opening edge is higher than the bottom plane of the housing, which can prevent water, dust, and debris from the ground from splashing directly into the bottom opening 13 and the sealing surface of the cover. Furthermore, the upwardly recessed groove does not occupy the ground space under the equipment, reducing the overall height of the equipment by 5-8cm, making it more suitable for embedded installation. This ensures that the cover does not protrude excessively from the bottom plane of the housing after being embedded, allowing the equipment to be placed stably on any flat surface. It also optimizes the overall center of gravity of the equipment, preventing the equipment from tilting due to excessive weight at the front.

[0040] Preferably, the bottom of the steam boiler 2 is arranged in a gradually downward slope from the point away from the wastewater outlet 21 towards the point closer to the wastewater outlet 21. The inclined structure at the bottom of the steam boiler 2 is essentially to create a directional drainage slope, using gravity to automatically collect wastewater, condensate, scale residue, etc. in the boiler to the lowest point of the wastewater outlet 21, achieving efficient emptying without the need for additional power devices (such as water pumps).

[0041] Optionally, refer to Figure 2 The ground support component 3 is a roller. Preferably, a combination of front omnidirectional wheels 31 and rear directional wheels 32 can be used, which makes the steam cleaner more flexible in steering and easier to move, greatly reducing the handling intensity and improving the safety and stability of use. Example

[0042] Reference Figures 3-6 Based on the structure of Embodiment 1, this embodiment provides a more preferred solution, as follows: the inner edge of the wastewater outlet 21 extends downward to form a vertical section 211, the vertical section 211 extends into the bottom opening 13 of the steam shell 1, and a sealing element 22 is provided between the outer wall of the vertical section 211 and the inner wall of the bottom opening 13.

[0043] The above configuration serves three purposes: First, it enables interface positioning guidance: the vertical section 211 extends into the bottom opening 13 of the steam shell 1, forming a guide structure for shaft-hole mating. When installing the steam boiler 2, simply inserting the vertical section 211 into the bottom opening 13 automatically aligns the relative positions of the boiler and the shell, preventing misalignment between the wastewater discharge port 21 and the bottom opening 13. Second, it enhances structural strength: the wastewater discharge port 21 is a weak point at the bottom of the boiler. The downward-extending vertical section 211, by extending the load-bearing arm, disperses the pressure at the bottom of the boiler to the bottom opening 13 of the shell, preventing deformation of the wastewater discharge port 21 due to excessive local stress. Third, it solidifies the drainage path: the vertical section 211 forms a straight-through drainage channel, directly guiding the wastewater in the boiler to the bottom opening 13 of the shell, preventing wastewater from stagnating in the gap between the boiler and the shell. Fourthly, the sealing element 22 is installed. When the vertical section 211 is inserted into the opening, the sealing element 22 is compressed and deformed to fill the gap between the two, thus playing a double sealing role (1. preventing high-pressure steam in the boiler from leaking from the interface; 2. preventing wastewater during venting from leaking from the interface gap into the equipment, avoiding corrosion of core components such as circuits and motors).

[0044] Furthermore, an internally threaded pipe joint 23 is provided within the vertical section 211, and the bottom cover 5 is threadedly connected to the internally threaded pipe joint 23. Compared with traditional cover connection methods such as snap-fit ​​and magnetic attraction, this threaded connection design has significant advantages in sealing reliability, ease of operation, and structural durability.

[0045] Specifically, the bottom cover 5 includes an integrally formed external thread section 51 and a screw cap section 52. A stepped groove 53 extends outward from the junction of the screw cap section 52 and the external thread section 51, and a sealing ring 531 is provided in the stepped groove 53. When the bottom cover 5 is connected to the internal thread pipe joint 23, the sealing ring 531 abuts against the junction of the external thread section 51 and the internal thread pipe joint 23, and the junction of the internal thread pipe joint 23 and the vertical section 211, respectively. In the above scheme, the sealing ring 531 plays a dual-interface sealing role, simultaneously sealing two leakage risk points. The sealing ring 531 in the stepped groove 53 is the core of the entire design, and its abutment positions (the junction of the external thread section 51 and the internal thread pipe joint 23, and the junction of the internal thread pipe joint 23 and the vertical section 211) precisely cover the two most easily leaking risk interfaces. First layer of sealing: Sealing the threaded connection seam. After the external thread section 51 and the internal thread pipe fitting 23 are tightened, a tiny gap will form at the thread engagement point. The sealing ring 531 is compressed against this point, filling the gap and preventing steam / wastewater from leaking from the threaded seam. Second layer of sealing: Sealing the connection seam between the pipe fitting and the vertical section 211. At the fixing point of the internal thread pipe fitting 23 and the vertical section 211 (where there may be process gaps), the sealing ring 531 also abuts against this point, forming a second sealing barrier to prevent leaked materials from seeping into the equipment from this connection seam. Example

[0046] Reference Figure 6 In this preferred embodiment, a support frame 6 is provided inside the steam shell 1. The steam boiler 2 is connected to the support frame 6 via a first fastener 61 (which may be screws or other accessories), and the support frame 6 is connected to the steam shell 1 via a second fastener 62 (which may be screws or other accessories). The support frame 6, as an intermediate carrier between the boiler and the shell, bears the three major functions of force transmission, assembly positioning, and functional isolation, and is the core guarantee for the structural stability and assembly flexibility of the steam cleaner. This design, through layered support and modular connection, solves the pain points of uneven force distribution, assembly difficulties, and inconvenient maintenance inherent in the traditional direct-fixed boiler shell mode, while also providing a reference support for the precise assembly of the preceding drainage system.

[0047] Furthermore, a wiring space 7 is formed between the support frame 6 and the bottom surface of the steam shell 1, and a through hole 63 is provided on the support frame 6. The steam boiler 2 has a heating tube 24, and at least part of the heating tube 24 enters the wiring space 7 after passing through the through hole 63. The wiring space 7 between the support frame 6 and the bottom surface of the steam shell 1 is not a simple gap, but a dedicated electrical connection area designed specifically for the heating tube 24 (the core heating component of the steam boiler 2). Its main function is to accommodate the wiring terminals, power lines, and control lines of the heating tube 24, physically isolating the high-temperature and high-pressure boiler area from the low-voltage electrical area, while providing standardized space for wiring to avoid the risk of short circuits caused by messy wiring. In addition, the through hole 63 on the support frame 6 is the directional channel for the heating tube 24 to extend from the boiler to the wiring space 7, and its design directly affects the installation accuracy and service life of the heating tube 24. Optionally, the first fastener 61 is arranged in an inverted position, with its head hidden within the wiring space 7, thus not occupying the upper boiler installation space. Simultaneously, the operating height of the wiring space 7 is convenient for tightening bolts with a wrench, avoiding the problem of the head protruding and obstructing wiring when the fastener is in the forward position. The second fastener 62 is arranged in the forward position, away from the bottom drainage groove area 14, avoiding operational conflicts with the bottom cover 5 and water container during disassembly. Together, these two fasteners achieve three benefits: first, physical isolation between high temperature and low pressure is achieved through the wiring space 7, standardizing wiring and reducing the risk of short circuits and electric shock; second, the modular process of adapting the directional fasteners avoids assembly conflicts and significantly improves production efficiency; and third, the independent design of the wiring space 7 and the ease of operation of the directional fasteners allow for maintenance of the heating element 24 and the boiler without disassembling the entire unit, reducing after-sales costs.

[0048] It is worth noting that the other technical solutions of this utility model are all existing technologies, and therefore will not be described in detail.

[0049] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the concept of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A steam cleaner having a waste water discharge function, characterized by comprising: Including: A steam housing (1) having a water inlet port (11) and a steam outlet port (12); A steam boiler (2) is installed inside a steam shell (1), and the steam boiler (2) is connected to the water inlet port (11) and the steam outlet port (12) respectively through pipelines; Its characteristic is that it further includes: A ground support member (3) is provided, and a bottom space (4) is formed between the bottom of the ground support member (3) and the bottom of the steam shell (1); The bottom of the steam boiler (2) has a wastewater outlet (21), and the bottom of the steam shell (1) has a bottom opening (13), with the wastewater outlet (21) facing the bottom opening (13). The bottom cover (5) is detachably connected to the wastewater outlet (21) through the bottom opening (13).

2. The steam cleaner with waste water discharge function according to claim 1, characterized in that: The bottom cover (5) is at least partially located in the bottom space (4).

3. The steam cleaner with wastewater discharge function according to claim 1, characterized in that: The bottom of the steam housing (1) is recessed upward to form a groove region (14), the bottom opening (13) is disposed in the groove region (14), and the bottom cover (5) is at least partially located in the groove region (14).

4. The steam cleaner with wastewater discharge function according to claim 1, characterized in that: The bottom of the steam boiler (2) is set in a gradually downward slope from the point away from the wastewater outlet (21) towards the point closer to the wastewater outlet (21).

5. The steam cleaner with wastewater discharge function according to claim 1, characterized in that: The inner edge of the wastewater outlet (21) extends downward to form a vertical section (211), which extends into the bottom opening (13) of the steam shell (1), and a sealing element (22) is provided between the outer wall of the vertical section (211) and the inner wall of the bottom opening (13).

6. The steam cleaner with wastewater discharge function according to claim 5, characterized in that: The vertical section (211) is provided with an internal threaded pipe joint (23), and the bottom cover (5) is threadedly connected to the internal threaded pipe joint (23).

7. The steam cleaner with wastewater discharge function according to claim 6, characterized in that: The bottom cover (5) includes an integrally formed external thread section (51) and a screw cap section (52), and the junction of the screw cap section (52) and the external thread section (51) extends outward to form a stepped groove (53), and a sealing ring (531) is provided in the stepped groove (53). When the bottom cover (5) is connected to the internal threaded pipe joint (23), the sealing ring (531) abuts against the junction of the external thread section (51) and the internal threaded pipe joint (23), and the junction of the internal threaded pipe joint (23) and the vertical section (211).

8. The steam cleaner with wastewater discharge function according to claim 1, characterized in that: The steam shell (1) is provided with a support frame (6), the steam boiler (2) is connected to the support frame (6) by a first fastener (61), and the support frame (6) is connected to the steam shell (1) by a second fastener (62).

9. The steam cleaner with wastewater discharge function according to claim 8, characterized in that: A wiring space (7) is formed between the support frame (6) and the bottom surface of the steam shell (1), and a through hole (63) is provided on the support frame (6). The steam boiler (2) has a heating pipe (24), and the heating pipe (24) enters the wiring space (7) after passing through the through hole (63) in at least part. The first fastener (61) is inverted, and the second fastener (62) is in the forward orientation.

10. The steam cleaner with wastewater discharge function according to claim 1, characterized in that: The aforementioned ground support component (3) is a roller.

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