JPH1033438A - Squeegee device of floor cleaning vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a squeegee device with a structure made on the inside surface of rear squeegee blade, into where such dropped dust as sludge on a floor can hardly be remained. SOLUTION: The cross-section of a suction space 30, surrounded by a squeegee frame 20, a front squeegee blade 25, a rear squeegee blade 26 and floor, is made so that it forms a top-like cross-section swollen upward in a triangular- like form in the vicinity of the inside surface of the rear squeegee blade 26. When the air sucked through a suction pipe 11 flows along the longitudinal direction of the squeegee device in the suction space 30, this makes the flow hard to receive a wall resistance, and most of a main fast flow 50 to run along the vicinity of inside surface of the rear squeegee blade 26, thus smoothly carrying out the dropped dust tended to remain thereon toward the suction pipe direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a skewing device for sucking sewage after washing of a floor washing vehicle for washing a floor with a washing brush while spraying a washing liquid on a floor surface.

[0002]

2. Description of the Related Art In a floor cleaning car for cleaning bare floors of industrial buildings and commercial buildings, a cleaning liquid is sprinkled on the floor, and a rotating cleaning brush is used to remove dirt on the floor surface. Dropping, relatively large garbage, such as small pieces of wood, or in the factory, cutting chips or even small parts (nuts, screws, etc.) can be suctioned and collected by a skew device that applies suction airflow. doing. As the skewing device, front and rear skewing blades are attached to the front and rear sides of the skewing frame with a U-shaped cross section that opens downward, and a suction pipe is installed in the center of the skewing frame in the longitudinal direction (width direction of the floor washing vehicle). In a state where the skew device is grounded, a suction airflow from a suction pipe acts on a space formed between the skew frame, the front, the rear skew blade, and the floor surface, and the space is formed. There is known a device in which sewage containing floor dirt and fallen trash on the floor are sucked by the cleaning action of the cleaning brush that has entered the inside (Japanese Patent Laid-Open No. 6-7276). Front and rear skew blades B and C are attached to the front and rear sides of the upwardly U-shaped skew frame A. The lower wall and front of the skew frame A, the rear skew blades B and C and the floor surface F are used. It is also known that the height of the formed sewage suction space is relatively small (FIGS. 12 and 13).

[0003]

In the above, since the front and rear sides of the downwardly U-shaped skew frame are closed by the blades, the cross-sectional area of the suction space is large. There is a problem that the flow velocity in the inside is not sufficiently large, and it is not possible to smoothly suck sewage and falling dust, which is not preferable from the viewpoint of energy saving. on the other hand,
Since the lower wall of the skewed frame A is close to the floor surface F, the cross-sectional area of the space forming the suction space is small, and even if the suction source has a small output, the suction flow rate is sufficient to convey the falling dust. However, there is a disadvantage that falling dust having a certain size is not easily conveyed in a suction space having a uniform low height. In addition, the suction space
Since it is along the length of the skewed frame, the suction airflow is a pipe flow along the length of the skewed frame. Therefore, on the lower surface of the skew frame A forming the space, the inner surfaces of the front and rear skew blades B and C, and the portions close to the floor surface F, the wall surface resistance acts on the suction air flow, and the suction flow velocity decreases. The part which is lowered and separated from the wall surface to some extent is a mainstream part having a high suction speed (that is, suitable for transporting sewage and heavy falling dust E to a suction pipe) (D in FIGS. 13 and 14). Indicated by
It has become. By the way, the skew blades B and C
Is generally made of a suitable elastomeric material, for example, a flexible material such as rubber, so that when the skewing device is grounded to the floor F and the floor cleaning vehicle is advanced, as shown in FIGS. Bend diagonally. Most of the fallen trash E that has pushed into the suction space by pushing the front skew blade B on the front side in the traveling direction is sucked and collected by the mainstream portion D. The movement of the apparatus tends to accumulate inside the rear skew blade C. However, in the case of the above structure, in the vicinity of the inner surface of the rear skew blade C, the space cross-sectional shape is reduced from a uniform height to a wedge shape.
There is little mainstream portion that acts effectively on the debris to be collected and carries it away, and the transport energy by the mainstream portion is small. Therefore, the debris E is not smoothly sucked and collected. There is a case where the rear skew blade C is pushed up by digging between the skew blade C and the floor F (FIG. 14). In such a case, the rear skew blade C rides on the accumulated falling dust E, and the rear squeegee blade C
The skew device is moved forward by the washing operation while the surface is raised from the floor surface F. Therefore, since the sewage is not wiped off the portion of the rear skewing blade C to which the falling dust E adheres, a streak-like wiping residue G remains behind in the traveling direction as shown in FIG. There was a problem that the finish looked very dirty. In addition, in the suction pipe H, as shown in FIG. 12, the suction airflow separates from the rear skew blade C and goes toward the pipe opening at a small angle with respect to the horizontal, and the suction airflow at the pipe opening suddenly increases. In addition, there is a problem that a large resistance floats to change the flow direction, and the suction cannot be performed smoothly.
An object of the present invention is to reduce the cross-sectional area of the suction space,
An object of the present invention is to provide a skewing device having a structure in which falling dust is reliably collected and the falling dust does not accumulate on the inner surface of the rear skew blade.

[0004]

In order to solve the above problems,
In the present application, the cross-sectional shape forming the suction space formed by the skew frame, the pair of front and rear skew blades, and the floor surface is a hook-like (L-shaped) cross-section in which the inner surface side of the rear skew blade protrudes upward. Also, even when the lower end of the skew frame is brought closer to the floor surface to increase the suction speed, the main flow portion of the suction airflow is biased in the vicinity of the inner surface of the rear skew blade to a greater extent than in the prior art.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a skewing device provided in a floor washing vehicle, in which a suction pipe is connected to a skew frame, and a suction airflow from the suction pipe is transmitted to a skew frame, a front skew blade, A cross-sectional shape that forms a suction space in a skew device that acts on a rear squeegee blade and a suction space that is surrounded by a floor surface and that extends along the length of the skew frame to suction an object to be suctioned in the suction space. Has a hook-shaped cross section in which the vicinity of the inner surface of the rear skewing blade bulges upward. The cross-sectional shape of the suction space includes a front portion in contact with the front skew blade and a rear portion in contact with the rear skew blade, and the rear portion has a substantially triangular cross-section that is higher than the upper end of the front portion. The triangular cross section forms a main flow portion of the suction airflow along the longitudinal direction of the skew frame near the inner surface of the rear skew blade. According to such a configuration, even when the lower end of the skew frame is configured to be close to the floor, the main flow portion where the suction airflow flows at a high speed in a larger range than in the related art is provided near the skew blade inner surface. Because it exists along the length of the, the relatively large falling dust is smoothly transported on the flow of its mainstream part, as in the past,
Falling debris is prevented from accumulating on the inner surface of the rear skew blade and pushing up the rear skew blade. As a result, the wiping action of the sewage by the rear skew blade is reliably performed, and the finished state after cleaning is improved.

[0006] The skew frame has a downward U-shaped cross section connecting the upper ends of the front and rear holding plates, and front and rear skew blades are attached to the outside of the holding plates. A closing member is interposed from the longitudinal outside position of the suction opening of the suction pipe to the longitudinal end portion, and the lower end of the closing member is located below the lower end of the rear holding plate, so that the floor surface and the rear skew A triangular cross-section is formed which is generally surrounded by the inner surface of the blade, the lower end of the rear holding plate, and the rear surface of the closing member. In this configuration, even if a downward U-shaped skew frame is employed, the space between the front and rear holding plates is closed by the closing member, and the lower surface of the closing member approaches the floor surface. Of the mainstream portion can be increased, and the suction speed of the mainstream portion can be increased.

The skew frame has a frame portion in which the front and rear holding plates are connected to the lower end by a lower plate to form an upward U-shaped cross section, and the front and rear skew blades are sandwiched by the skew frame. Attachment, after which the connecting part between the side holding plate and the lower wall is formed on an inclined surface that is inclined forward and obliquely downward, and a triangular cross-section that is generally surrounded by the floor surface, the inner surface of the rear scooter blade, and the inclined surface It may be formed. Also in this configuration, the lower wall connecting the front and rear holding plates of the skew frame can be close to the floor, and the cross-sectional area of the suction space can be reduced.

[0008] The suction pipe connected to the skew frame and the suction space near the inner surface of the rear squeegee blade allow the suction airflow from the suction pipe to act in a direction along the rear squeegee blade at a portion corresponding to the suction pipe. It is preferable that the communication is performed such that Specifically, by providing a passage groove having a shape recessed upward from the lower end on the rear holding plate of the skew frame at a pipe connection portion to which the suction pipe is connected, suction airflow from the suction pipe is reduced. Acts in the direction along the skew blade. With this configuration, along the length of the skew device, the collected material that has been conveyed toward the suction pipe by the mainstream portion near the inner surface of the rear skew blade is guided by the inner surface of the rear skew blade,
In order not to change the flow direction largely with respect to the suction opening, the pipe resistance is reduced, and the liquid is smoothly sucked into the suction pipe.

Furthermore, it is more preferable that the inner surface of the air suction path formed by the suction pipe is formed obliquely so as to be substantially continuous with the inner surface of the rear skew blade in a grounded state. With this configuration, the pipeline resistance is further reduced, and the suction can be performed stably.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a floor cleaning car 1 will be described with reference to the drawings. In FIG. 1, a left and right front wheel 3 and a caster-type rear wheel 4 are rotatably provided on a frame 2 of a floor cleaning vehicle 1, and can be run by a running motor (not shown). Further, left and right cleaning brushes 5 and 5 rotatable by a drive motor are supported at the lower front part of the frame 2 via a lifting mechanism so as to be vertically movable. At the center of rotation of the left and right cleaning brushes 5, 5, watering hoses 7 are provided, respectively.
The cleaning liquid supplied from the cleaning tank 8 is sprayed from the watering hose 7 onto the floor at the rotation center of the cleaning brush 5, and the cleaning of the floor is performed by the rotation of the cleaning brush 5. Also,
In the lower rear part of the frame 2, sewage generated after cleaning by the cleaning brush 5, fine wood chips, cutting chips, or small parts (small nuts,
A skew device 10 that also sucks small articles having a mass (weight) other than sewage, such as bolts, having a size of several millimeters (3 to 4 mm) or less;
Are connected via a support arm 14, and the sewage and falling dust sucked by the skewing device 10 are collected in a sewage tank 9 via a suction pipe 11. 1
Reference numeral 2 denotes a battery mounted on the frame 2 for supplying power to a traveling motor, a driving motor, and the like, and 13 denotes a hand-held handle.

As shown in FIG. 4 and FIG.
Numeral 0 includes a skew frame 20 having a downward U-shaped cross section in which front and rear holding plates 15 and 16 are connected by an upper plate 17. The skew frame 20 extends straight in a direction intersecting the traveling direction of the floor washer 1, and the rear holding plate 16 is bent forward at the longitudinal end and is in contact with the front holding plate 15. . The front and rear holding plates 15 and 16 are suspended so that their lower end positions are the same. The upper plate 17 is provided with an oval hole 21 at the longitudinal center portion of the skew frame 20, and the hole 21 communicates with the suction pipe 11 attached to the upper surface of the upper plate 17. Rear holding plate 1
6 has a semicircular notch (communication groove) recessed upward from the lower end at a position corresponding to the mounting position of the suction pipe 11.
22 are formed. From a position on both sides of the skew frame 20 at the connection part of the suction pipe 11 (both sides of the hole 21) to a longitudinal end of the skew frame 20,
A blocking member 23 having a rectangular cross section is interposed between the front and rear holding plates 15 and 16. The closing member 23 is made of a sponge. The lower end surface 23a of the closing member 23 is located further below the lower ends of the front and rear holding plates 15 and 16, the rear end surface 23b of the closing member 23, the lower end of the rear holding plate 16 and the rear end surface 23b of the closing member 23. A groove portion is formed in the lower portion of the rear portion of the skew frame 20 at the portion of the rear skew blade 26 that faces the skew frame.

On the front and rear outer surfaces of the front and rear holding plates 15 and 16 respectively, a front skew blade 25 and a rear skew blade 26 made of an elastomer material, for example, a flexible material such as rubber, are attached. , And are integrally connected via a holding plate 28 by positioning pins 27a. The lower ends of the skew blades 25, 26 are located further below the lower end surface 23a of the closing member 23. In a state where the skew blades 25 and 26 are in contact with the floor surface F, the closing member 23, the front and rear inner surfaces 25a and 26a of the skew blades 25 and 26, and the rear holding plate 16 allow the inside of the skew frame 20 to be moved. A suction space 30 is formed in a portion corresponding to the closing member 23 along the length of the skew frame 20. As shown in FIG. 5, the cross-sectional shape of the space forming the suction space 30 includes a front portion 31 in contact with the front skew blade 25 and a rear portion 32 in contact with the rear skew blade 26.
The front part 31 is vertically surrounded by the lower surface 23 a of the closing member 23 and the floor surface F, and the front side is surrounded by the inner surface 25 a of the front skew blade 25.
b, and the rear portion 32 includes a floor surface F,
This is a substantially triangular space surrounded by a vertical surface including the inner surface 26a of the rear skew blade 26, the lower end of the rear holding plate 16, and the rear end surface 23b of the closing member 23. As is apparent from FIG. 5, the top of the substantially triangular cross section (the apex of the groove) is located above the lower end surface 23a of the closing member 23, and the overall cross-sectional shape of the space is such that the rear skew blade 26 side is upward. It has a bent hook-shaped cross section. A floor surface F is provided below the opening 11a of the suction pipe 11.
And a floor surface from a portion corresponding to the longitudinal inner end surfaces 23c of the left and right closing members 23, the inner surface 15a of the front holding plate 15, the inner surface 25a of the front skew blade 25, the inner surface 16a of the rear holding plate 16, and the communication groove 22. A suction passage 40 is formed which is surrounded by the portion of the rear squeegee blade 26 that reaches F and the inner surface 26a. The lower part of the suction passage 40 also functions as a suction space. As is clear from FIGS.
The suction space 30 and the suction passage 40 are in communication with each other, and the suction airflow acts on the suction space 30 via the suction passage 40.

The size of the cross-sectional area of the suction space depends on the suction force from the suction pipe 11 (the suction capability of the suction source), so that the main flow portion 50 capable of carrying the above-mentioned falling dust can also be provided.
It is set to a size that can obtain the flow velocity of. If the capacity of the suction source is the same, the size of this cross-sectional area is the same as that shown in FIG. 13 described above. Therefore, in this embodiment, the rear space 32 is expanded by the amount of the front space 31 by the expansion. The area is smaller. Further, the closing member 23 and the floor F
When the rear skew blade 26 and the front skew blade 25 are grounded and the suction action is performed, even if the floor surface F has irregularities, the closing member 23 is formed on the floor surface F by the irregularities. The minimum gap is determined by the size of the unevenness without interference.

The cleaning brushes 5 and 5 are rotated while the floor cleaning wheel 1 is moved forward and the cleaning liquid is sprinkled. At the same time, the skew device 10 is grounded, and the suction airflow acts on the suction space 30 via the suction pipe 11. Then, the suction airflow flows along the length of the suction space 30. Since the flow is a flow in the pipe, the flow rate decreases at the portions in contact with the inner surfaces of the members 20, 23, 25, 26, and F forming the cross section of the suction space 30 due to the wall resistance, and the flow rate decreases. The part surrounded by a predetermined distance from the inner surface is less susceptible to such influence,
This is the portion where the flow velocity is fast (main flow portion 50). Mainstream part 50
Is distributed so as to decrease from a uniform distribution in the front space as in the related art, because the cross-sectional shape of the suction space 30 has a shape that bulges upward in the vicinity of the later skew blade 26. Instead, as shown in FIG. 5, in the vicinity of the rear skew blade 26, the distribution state is such that the distribution swells upward once and decreases, and the mainstream portion 50 wider than before appears in the vicinity of the inner surface of the rear skew blade 26. .

As the washing car 1 advances, sewage, which is contaminated with dirt on the floor F, passes under the front squeegee blade 25 and enters the suction space 30, and drops of dust such as chips on the floor F. Also enters the suction space 30. These suctioned objects that have entered immediately below the suction passage 40 are immediately sucked up, and the suctioned objects that have entered the suction space 30 below the closing member 23 also pass through the suction passages from both ends of the skew device 10. It is collected via the suction passage 40 on the flow toward 40. At this time, even if some of the fallen trash tries to accumulate on the front side of the contact portion between the rear skew blade 26 and the floor surface F due to the advance of the skew device 10, it is suctioned in a substantially triangular cross section near the rear skew blade 26. Since the mainstream portion 50 of the airflow 30 exists as a larger flow than in the past, such falling debris rides on the flow of the mainstream portion 50 and is smoothly transported toward the suction pipe 11. Even relatively large falling dust which is difficult to be transported in the front portion is transported along the flow of the wide mainstream portion 50 near the inner surface of the rear skewing blade 26. Accordingly, since large falling dust such as cuttings does not collect inside the rear skew blade 26 and the rear skew blade 26 can be prevented from riding on the trash, the ground state of the rear skew blade 26 can be improved. It is kept and the wiping action of sewage is not hindered.

When the object to be suctioned is transported in the direction of the suction pipe 11 along the flow of the main flow portion 50 near the rear skewing blade 26, the suction pipe 11
The transport direction is changed in the direction. At this time, the suction air flow acts along the inner surface of the rear skew blade 26 by the communication groove 22, and the flow direction in the suction passage 40 does not change much as compared with the conventional case. Since it is guided by the inner surface 26a of the suction pipe 26 and smoothly sucked up into the opening of the suction pipe 11, suction can be performed with less resistance than in the conventional case without such a notch.

Next, a description will be given of a case where the skew device 10 is curved. As shown in FIG. 7, about half the length, the skew frame 60 includes a central portion 61 and left and right side portions 62 continuous therewith. The central portion 61 occupies approximately 1/3 of the entire length, the rear holding plate 63 is curved, and the front holding plate 64 is straight. The front and rear holding plates 63 and 64 are continuous by a horizontal lower wall 65, and the cross-sectional shape of the central portion 61 is an upward U-shape as shown in FIG. A connecting portion between the rear holding plate 63 and the lower wall 65 is formed on an inclined surface 66 facing forward, and a groove is formed below a rear portion of the skew frame 60. The front surface 64a of the front holding plate 64 and the rear surface 63a of the rear holding plate 63 have front and rear surfaces 62a, 62b of the side portion 62.
Are continuous. The side portion 62 extends obliquely forward in the traveling direction, has a substantially rectangular cross section, and has a slope 62c facing forward formed at the rear lower end corner.
0). Lower plate 65 lower surface 65a of central portion 61 and side portion 6
A step 80 is provided in the middle of the lower surface 62d of the second member 2 and the lower surface 65a of the lower plate 65 of the central portion 61 is located below.
In the center of the central portion 61, a pipe mounting hole 6 is formed in the lower plate 65.
The lower end of the suction pipe 67 is fitted into the pipe mounting hole 69 between the front and rear holding plates 63 and 64, as shown in FIG. On the rear surface of the suction pipe 67, there is provided a notch 68a recessed upward from the lower end. A similar notch 68b is provided in the rear holding plate 63 that faces the notch 68a. The notch 68a, 68b forms a communication groove 68.

A front skewing blade 70 is attached to the front surface 62a of the left and right side portions 62 and the front surface 64a of the front holding plate 64 of the central portion 61. A rear skewing blade 71 is provided on the rear surface 63a of the rear holding plate 63 of the central portion 61 and the rear surface 62b of the left and right side portions 62.
Is attached. The front and rear inner surfaces of the skewing blades 70 and 71, the skewed frame 60, and the floor F form suction spaces 30A and 30B along the length of the skewed frame 60. In the central portion 61, the cross-sectional shape forming the suction space 30A is such that the front skew blade 70, the lower plate 65 lower surface 65a, and the floor surface F
A substantially rectangular front portion 31A extending to the lower side of the inclined surface 66, and a generally triangular rear portion 32A surrounded by the inclined surface 33, the inner surface of the rear skewing blade 71, and the floor surface F.
As is apparent from FIG. 9, the triangular top is located above the lower plate 65 lower surface 65a, and the cross-sectional shape in the vicinity of the rear skewing blade 71 is increased upward as in the previous embodiment. It has a hook shape. Note that the same reference numerals are given to the same parts as those in the above-described embodiment, and the description is omitted.

According to this configuration, the suction airflow from the suction pipe 67 acts from the suction space 30B in the side portion 62 to the suction space 30A in the central portion 61, and the suctioned air flowing into the spaces 30A, 30B. The object is conveyed toward the suction pipe 11. In the central portion 61, even if the above-mentioned fallen dirt accumulates inside the rear skew blade 71, as in the previous embodiment, the high-speed main flow portion 50 due to the suction airflow causes the rear skew blade 7
1 and is larger than the conventional one and has a larger area, so that it is smoothly transported in the direction of the suction pipe 67 on the mainstream portion 50, and does not accumulate on the inner surface of the rear skewing blade 71 and does not adhere thereto. Also, in this way, the suction pipe 6
The suction object carried downward 7 is guided by the bent inner surface of the rear skew blade 71 in the suction passage 40 in the same manner as in the previous embodiment, by providing the communication groove 68, so that the change in the flow direction is reduced. Since it is sucked up, there is little pipeline resistance.

In the above-described embodiment, the suction pipe is attached vertically downward, and the air suction path in the suction passage 40 is located above the notch provided in the rear holding plate and the suction pipe on the rear skewing blade 71 side. The edge was a slight step, and the change in the flow direction of the suction airflow was discontinuous due to the step, leaving some resistance to the flow of the suction airflow. As shown in FIG. 11, the mounting direction of the suction pipe 67 is inclined, and the rear inner surface (air suction passage) 67a is substantially continuous with the inner surface of the bent rear skewing blade 71 to eliminate the stepped portion. Resistance can be reduced.

[0021]

As described above, according to the present invention, the main stream portion of the suction airflow near the inner surface of the rear skew blade is made to exist as a larger flow than in the past, so that the falling dust tends to collect on the inner surface of the rear skew blade. However, the falling debris rides on the flow of the mainstream portion near the inner surface of the rear skewing blade and is smoothly transported along the length of the skewing device. Leaving can be prevented, and the finish of the floor surface after washing becomes good. In addition, the collected material conveyed toward the suction pipe by the mainstream portion of the inner surface of the rear skew blade along the length of the skew device can be smoothly sucked into the suction pipe with low resistance.

[Brief description of the drawings]

FIG. 1 is a side view of a floor cleaning vehicle.

FIG. 2 is an enlarged view as viewed in a direction II of FIG. 1, and is a view showing about a half of a length of the skew device.

FIG. 3 is a perspective view of FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is a sectional view taken along line VV of FIG. 2;

FIG. 6 is a diagram showing another half of the skew device viewed from the rear about half its length.

FIG. 7 is a VII view of FIG. 6;

FIG. 8 is a sectional view taken along line VIII-VIII of FIG. 6;

FIG. 9 is a sectional view taken along line IX-IX of FIG. 6;

FIG. 10 is a sectional view taken along line XX of FIG. 6;

FIG. 11 is still another embodiment.

FIG. 12 is a cross-sectional view of a suction pipe section of a conventional skew device.

FIG. 13 is a cross-sectional view corresponding to FIG. 9 in a conventional skew device.

FIG. 14 is a diagram showing a drawback of the conventional device.

FIG. 15 is a diagram for explaining the drawbacks of the conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Floor washing vehicle 10 Skewing device 11 Suction pipe 15 Front side holding plate 16 Rear side holding plate 22 Passing groove 25 Front skew blade 26 Rear skew blade 30 Suction space 31 Front part 32 Back part 50 Mainstream part

Claims (7)

[Claims] 1. A skew device provided in a floor washing vehicle, wherein a suction pipe is connected to a skew frame, and a suction airflow from the suction pipe is supplied to the skew frame.
A front skew blade, a rear skew blade, and a skew device that acts on a suction space that is surrounded by a floor and extends along the length of the skew frame to suction an object to be suctioned in the suction space. The cross-sectional shape of the skewing device for a floor cleaning car, wherein the cross-sectional shape of the rear squeegee blade is a hook-shaped cross-section that protrudes upward in the vicinity of the inner surface. 2. A cross-sectional shape of the suction space includes a front portion in contact with the front skew blade and a rear portion in contact with the rear skew blade, and the cross-sectional shape of the rear portion bulges above the upper end of the front portion. 2. The floor cleaning car skewing device according to claim 1, wherein the skewing device has a substantially triangular shape. 3. The skew frame has a downward U-shaped cross section connecting the upper ends of the front and rear holding plates, and front and rear skew blades are attached to the outside of the holding plates. Between the holding plates, a closing member is interposed from the longitudinal outside position of the suction opening of the suction pipe to the longitudinal end, and the lower end of the closing member is located below the lower end of the rear holding plate. 3. The skewing device for a floor washing vehicle according to claim 2. 4. The skew frame has a front and rear skew frame with a front and rear holding plate having a lower U-shaped cross section with a lower end connected by a lower plate. 3. A scrubbing device for a floor washing vehicle according to claim 2, wherein a blade is attached, and a connecting portion between the rear side holding plate and the lower wall is formed on an inclined surface inclined obliquely downward toward the front. 5. A suction pipe connected to a skew frame and a suction space portion near an inner surface of a rear skewing blade, the direction in which the suction airflow from the suction pipe corresponds to the suction pipe along the rear skew blade. 2. The communication as set forth in claim 1, wherein
The skewing device for a floor washing car according to any one of claims 1 to 4. 6. A passage groove having a shape recessed upward from a lower end thereof is provided in a rear holding plate of a skew frame at a pipe connection portion to which a suction pipe is connected. Floor cleaning car skewing equipment. 7. The floor according to claim 6, wherein the inner surface of the air suction path formed by the suction pipe is formed obliquely so as to be substantially continuous with the inner surface of the rear skew blade in a grounded state. Skewing device for washing car.