CN113550255B - Third brush structure of small-sized sweeper - Google Patents

Abstract

The invention provides a third brush structure of a small-sized sweeper, which relates to the technical field of environmental sanitation sweeping equipment, and can be used for arranging a third brush aiming at the small-sized sweeper, so that the space requirement of the small-sized sweeper is met, the arrangement requirement on an air suction inlet is low, and the air suction inlet is allowed to be arranged at the front position; the third brush structure comprises a first section arm, a second section arm, a cleaning brush and a third brush mounting piece fixedly connected with the vehicle body; the third brush mounting piece, the first section arm, the second section arm and the cleaning brush are sequentially connected; the first arm can rotate along the horizontal plane in a limiting way relative to the third brush mounting part; the second arm section can be extended or folded relative to the first arm section; the hydraulic cylinder of the first section arm is connected with the second section arm through a connecting piece which is reversely arranged, and the second section arm is pushed and pulled to realize extension and folding. The technical scheme provided by the invention is suitable for the design, production and use processes of the sweeper.

Description

Third brush structure of small-sized sweeper

Technical Field

The invention relates to the technical field of environmental sanitation cleaning equipment, in particular to a third brush structure of a small-sized cleaning vehicle.

Background

Along with the continuous improvement of the living standard of people, the construction scale of cities is continuously enlarged, and the role played by the sweeper in the cities is more and more important. At present, the cleaning vehicle for the external road condition generally adopts a third brush to expand the working range of the cleaning vehicle. For the small-sized sweeper, although the small-sized sweeper has stronger passing performance, the arrangement of the air suction ports and the state of the side brushes in the retraction process can be influenced due to the smaller size of the small-sized sweeper, and the arrangement space of the third brushes of the comparison vehicle type is occupied.

Accordingly, there is a need to develop a third brush arrangement for a small motor sweeper that reconciles the conflict of existing small space layouts to address or mitigate one or more of the problems described above.

Disclosure of Invention

In view of the above, the invention provides a third brush structure of a small-sized sweeper, which can be used for arranging the third brush aiming at the small-sized sweeper, thereby meeting the space requirement of the small-sized sweeper, not affecting the arrangement of the air suction ports and ensuring better trafficability of the sweeper.

The invention provides a third brush structure of a small-sized sweeper, which is characterized by comprising a first section arm, a second section arm, a sweeper and a third brush mounting piece fixedly connected with a sweeper body;

the third brush mounting piece, the first section arm, the second section arm and the cleaning brush are sequentially connected;

the first arm can rotate along the horizontal plane in a limiting way relative to the third brush mounting part;

the second arm section is extendable or foldable relative to the first arm section.

In the aspect and any possible implementation manner described above, there is further provided an implementation manner, where the first arm includes a first rigid arm and a first hydraulic cylinder fixed on an upper side of the first rigid arm;

the first rigid arm and the second arm-saving connecting piece are hinged; the end part of a piston rod of the first hydraulic oil cylinder is hinged with one end of a connecting piece which is reversely arranged; the other end of the reverse arrangement connecting piece is fixedly connected with the second section arm connecting piece.

In aspects and any one of the possible implementations described above, there is further provided an implementation, the reverse arrangement connection includes a first connection, a second connection, and a buffer;

one end of the first connecting piece is hinged with the end part of a piston rod of the first hydraulic oil cylinder, the other end of the first connecting piece is fixedly connected with one end of the second connecting piece through the buffer piece, and the other end of the second connecting piece is fixedly connected with the second knuckle arm connecting piece.

In the aspects and any possible implementation manners as described above, there is further provided an implementation manner, where the buffer member is a bidirectional torsion spring. Through the two-way torsional spring card dead, when the resistance exceeded two-way torsional spring card dead force, two-way torsional spring took place to obviously warp and absorbs overload, and protection architecture is spacing by sheet metal component fork structure angle simultaneously, hits other parts when avoiding the energy-absorbing.

In aspects and any one of the possible implementations described above, there is further provided an implementation, wherein the first connector and the second connector are at an acute angle of no more than 30 °. The reverse arrangement connecting piece is coaxially hinged with the second knuckle arm connecting piece and the first rigid arm through the bidirectional torsion spring, a buffer effect is achieved through the bidirectional torsion spring, and meanwhile, the fork-shaped structure is arranged on the reverse arrangement connecting piece for limiting. The angle of the fork-shaped structure is influenced by the arm length of the extending hinge point of the connecting piece, the left and right limit positions of the third brush, the folding and retracting positions of the third brush and the joint gap.

In aspects and any one of the possible implementations described above, there is further provided an implementation, the second joint arm including a second hydraulic ram and a second rigid arm; the second hydraulic cylinder is fixedly connected with the second section arm connecting piece; the second rigid arm is hinged with the second knuckle arm connecting piece;

the second hydraulic cylinder is arranged above the second rigid arm;

the end of the second rigid arm is provided with a sling fixing piece, and the end part of a piston rod of the second hydraulic oil cylinder is connected with the sling fixing piece through a hinged chain or sling; the road surface can appropriately float upwards when encountering obstacles, and has certain road surface adaptability.

In the aspect and any possible implementation manner described above, there is further provided an implementation manner, where a pull rope mounting member is fixedly provided at an end of the second arm, and the pull rope mounting member is connected with a cleaning brush mounting member for connecting the cleaning brush through a torsion spring. When the stay cord is not stressed, the wrist piece is deflected to a certain extent through the torsion spring, generally at about 5 degrees, a certain torsion moment is reserved, and when the stay cord is stressed, the wrist piece is deflected to the other side to a certain extent, so that the sweeping and grounding angle can be adjusted according to the swinging and cleaning direction. The working condition that is particularly suitable for the second arm section to work independently and the first arm section to work cooperatively is adopted. The stay cord can adopt the tricycle electric motor car brake cable, is convenient for purchase.

In the aspect and any possible implementation manner, there is further provided an implementation manner, wherein a transverse strip hole is arranged on the cleaning brush mounting piece, so that the range of the swing track of the brush disc can be limited; the pull rope mounting piece is provided with a through hole matched with the pull pin, and the pull pin passes through the through hole and the strip hole and then is prevented from falling off by the limiting piece; the pull pin is fixedly connected with one end of the pull rope, the other end of the pull rope sequentially penetrates through the plurality of pull rope through holes and then is connected with the electric push rod arranged at the first arm, the electric push rod is used for acting and tensioning, and when the electric push rod contracts, the electric push rod is reset mainly by means of torsion spring force.

In the aspects and any possible implementation manner described above, there is further provided an implementation manner, where the hydraulic cylinder is a direct-acting bidirectional hydraulic cylinder.

In the aspect and any possible implementation manner as described above, there is further provided an implementation manner, in which the third brush mounting member includes a plate member fixedly connected with the vehicle body and a first connecting frame fixedly connected with the plate member; the end part of the first arm is provided with a second connecting frame; the first connecting frame is electrically hinged with the second connecting frame.

In the aspects and any possible implementation manner, there is further provided an implementation manner, the first connecting frame is provided with a proximity switch, the second connecting frame is provided with a left limit detection piece and a right limit detection piece, the limit detection pieces are arranged opposite to the proximity switch, and the positions of the two limit detection pieces are used as left limit positions and right limit positions of the second connecting frame relative to the rotation of the first connecting frame.

In accordance with the above aspect and any possible implementation manner, there is further provided an implementation manner, where the hinge of the first connecting frame and the second connecting frame is provided with a physical limiting structure, which is used to limit the rotation of the first arm relative to the third brush mounting member.

In the aspect and any possible implementation manner as described above, there is further provided an implementation manner, where the second connecting frame is in a shape of a horizontal "U"; the first connecting frame comprises an upper part and a lower part which are arranged in parallel;

the first connecting frame and the second connecting frame are inserted in the horizontal direction and hinged in the vertical direction.

In aspects and any one of the possible implementations described above, there is further provided an implementation, the cleaning brush including a rotating disk, a motor disposed above the rotating disk, and a brush disposed below the rotating disk; a rotary centering structure is arranged in the middle of the rotary disk;

a sinking type bearing mounting hole is formed in the middle of the rotary centering structure, and a motor shaft is inserted into the bearing mounting hole and connected with a bearing to drive the hairbrush to rotate;

the motor shaft is of a conical structure with a wide bottom and a narrow top;

the whole rotary centering structure is in a circular plate shape, and the thickness of the rotary centering structure is more than 2 times of that of the rotary disk.

Compared with the prior art, one of the technical schemes has the following advantages or beneficial effects: the third brush can be arranged aiming at the small-sized sweeper, so that the space requirement of the small-sized sweeper is met, and the arrangement of the air suction port is not influenced;

the other technical scheme has the following advantages or beneficial effects: the stay ropes and the torsion springs are arranged, so that the third brush can adapt to the working environment of left-right swing, and a brake system can be started to perform corresponding coping operations when an obstacle exists;

the other technical scheme has the following advantages or beneficial effects: the soft chain sling is arranged, so that the fluctuation of the road surface can be adapted by means of gravity;

the other technical scheme has the following advantages or beneficial effects: the telescopic interference can be avoided, so that the third brush structure state is firmer.

Of course, it is not necessary for any of the products embodying the invention to achieve all of the technical effects described above at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a perspective view of a third brush structure of a small sweeper provided in one embodiment of the present invention;

FIG. 2 is a top view of a third brush structure of a small sweeper provided in accordance with one embodiment of the present invention;

FIG. 3 is a block diagram of a reverse arrangement connector provided by one embodiment of the present invention;

FIG. 4 is a diagram of a two-jointed arm extended state provided by one embodiment of the present invention;

FIG. 5 is a diagram of a sling layout according to one embodiment of the present invention;

FIG. 6 is a view of the attachment of a third brush mount to a first arm according to one embodiment of the present invention;

FIG. 7 is a view of a second arm segment coupled to a sweeper brush according to one embodiment of the present invention;

FIG. 8 is a layout of a rotational centering structure provided in one embodiment of the invention.

Wherein, in the figure:

1. a first arm; 2. a second arm segment; 3. a cleaning brush; 4. a third brush mount; 5. arranging the connecting pieces reversely; 6. a second arm link; 7. a torsion spring; 8. a pull pin; 9. a slit hole; 10. a cleaning brush mounting member; 11. a pull rope mounting member;

1.1, a first hydraulic cylinder; 1.2, a first rigid arm; 1.3, an electric push rod;

2.1, a second hydraulic cylinder; 2.2, a second rigid arm; 2.3, slings;

3.1, rotating the disc; 3.2, a motor; 3.3, hairbrush; 3.4, rotating the centering structure; 3.5, bearing mounting holes; 3.6, a conical structure;

4.1, a proximity switch; 4.2, a first connecting frame; 4.3, a second connecting frame; 4.4, limiting the detection piece;

4.5, a physical limiting structure;

5.1, a first connector; 5.2, a second connecting piece; 5.3, a buffer piece.

Detailed Description

For a better understanding of the technical solution of the present invention, the following detailed description of the embodiments of the present invention refers to the accompanying drawings.

It should be understood that the described embodiments are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

The present embodiment provides a third brush structure of a small-sized sweeper, as shown in fig. 1, comprising a first arm section 1, a second arm section 2, a sweeper brush 3 and a third brush mounting member 4 for connection with a vehicle body. One end of the first section arm 1 is connected with the third brush mounting piece 4, the other end of the first section arm 1 is movably connected with one end of the second section arm 2, and the other end of the second section arm 2 is connected with the top of the cleaning brush 3. The second arm section 2 is folded or extended relative to the first arm section in use to achieve a folded or extended condition of the third brush.

Specifically, as shown in fig. 2 and 3, the first arm section 1 includes a first rigid arm 1.2 and a first hydraulic cylinder 1.1 fixedly disposed above the first rigid arm 1.2, the hydraulic cylinder 1.1 is a direct-acting bidirectional hydraulic cylinder, the first rigid arm 1.2 is connected with the second arm section 2 through a second arm section connecting piece 6, the first rigid arm 1.2 is hinged with the second arm section connecting piece 6, and the end of a piston rod of the first hydraulic cylinder 1.1 is hinged with one end of a reverse arrangement connecting piece 5. The other end of the reverse arrangement connecting piece 5 is fixedly connected with the second knuckle arm connecting piece 6.

In one embodiment, the reverse arrangement connecting piece 5 comprises a first connecting piece 5.1, a second connecting piece 5.2 and a buffer piece 5.3, one end of the first connecting piece 5.1 is hinged with the end part of a piston rod of the first hydraulic oil cylinder 1.1, the other end of the first connecting piece is fixedly connected with one end of the second connecting piece 5.2 through the buffer piece 5.3, and the other end of the second connecting piece 5.2 is fixedly connected with the second knuckle arm connecting piece 6. The first and second connectors 5.1, 5.2 are at an acute angle, typically not exceeding 30 °. When the hydraulic arm stretching device works, the piston rod of the first hydraulic oil cylinder 1.1 stretches to push the reversely arranged connecting piece 5, so that the second arm connecting piece 6 is driven to rotate relative to the first rigid arm 1.2, and the stretching action of the second arm 2 relative to the first arm 1 is realized.

Specifically, as shown in fig. 4, a state diagram in which two sections of arms are stretched almost in the same straight line is shown; conversely, when the piston rod of the first hydraulic oil cylinder 1.1 is contracted, the reverse arrangement connecting piece 5 is pulled, so that the second joint arm connecting piece 6 is driven to reversely rotate relative to the first rigid arm, the folding and retracting action of the second joint arm relative to the first joint arm is realized, and the figure 2 is a semi-folding state diagram. The buffer part 5.3 is of a two-way action torsion spring structure, and absorbs impact energy to protect other mechanisms when the tail end of the broom touches an obstacle on the left side or the right side. One end of the two ends of the two-way action torsion spring structure is clamped on the first connecting piece 5.1, and the other end is clamped on the second connecting piece 5.2.

In a specific embodiment, the second arm connecting piece 6 is hinged with the first rigid arm, and a hinged plate is fixedly connected to the second arm connecting piece 6, and a hinged hole is formed in the hinged plate and hinged with a hinged hole in the first rigid arm 1.2. The axially fixed position of the counter-arranged connection piece 5 and the hinge position of the first rigid arm and the second joint arm connection piece 6 are coaxial, i.e. the second joint arm connection piece 6, the first rigid arm 1.2, the counter-arranged connection piece 5 are coaxially hinged. It should be noted that, in order to obtain a more stable structural performance, the hinged plate and the second connecting piece 5.2 of the opposite arrangement connecting piece may be integral, i.e. the hinged plate is entirely in the shape of a lying "U", both the upper and lower sub-plates of the hinged plate being hinged with the first rigid arm 1.2, the first connecting piece of the opposite arrangement connecting piece being hinged on the one hand on this hinge shaft and on the other hand its end being fixedly connected to the hinged end of the first connecting piece 5.2 (i.e. the upper sub-plate of the lying "U" shaped hinged plate) by means of a buffer piece 5.3 of the double-acting torsion spring structure (this fixed connection does not take into account the deformation buffering characteristics of the double-clamp spring itself). When the device works, the first hydraulic cylinder pushes the reversely arranged connecting piece 5 to rotate along the hinge shaft, and the torsion spring transmits force to push the second knuckle arm connecting piece 6 to rotate along the hinge shaft, so that the angle between the second knuckle arm connecting piece 6 and the first rigid arm is enlarged until the angle reaches the maximum, and the angle is approximately 180 degrees, so that the second knuckle arm 2 is stretched; likewise, when the first hydraulic cylinder pulls the reversely arranged connecting piece 5, the second section arm connecting piece 6 is driven to rotate along the hinge shaft, so that the angle between the second section arm connecting piece 6 and the first rigid arm is reduced, the inherent angle of the reversely arranged connecting piece 5 is minimized, and the second section arm 2 is folded. Fig. 2 shows a semi-folded state, in which the first hydraulic cylinder and the first rigid arm are not in the same straight line, and fig. 4 shows an unfolded state, in which the included angle between the first hydraulic cylinder and the first rigid arm is the largest.

As a specific embodiment, the end of the first hydraulic cylinder 1.1 is hinged to a fixing element fixed to the end of the first rigid arm. In order to have fixing and supporting effects on the first hydraulic cylinder 1.1 in the telescopic process, a plurality of protection grooves are formed in the upper surface of the first rigid arm, the first hydraulic cylinder is movably connected with the protection grooves, the movement track of the first hydraulic cylinder in the stretching and folding process can be limited, and the first arm structure is stable and is strengthened.

In one embodiment, as shown in FIG. 5. The second joint arm 2 comprises a second hydraulic oil cylinder 2.1 and a second rigid arm 2.2, the second hydraulic oil cylinder 2.1 is fixedly connected with a second joint arm connecting piece 6, and the second rigid arm 2.2 is hinged with the second joint arm connecting piece 6. The second hydraulic ram 2.1 is arranged above the second rigid arm 2.2. The end of the second rigid arm 2.2 is provided with a sling fixing part, the end part of a piston rod of the second hydraulic cylinder 2.1 is connected with the sling fixing part through a soft sling, the end of the second rigid arm can be pulled by telescopic hanging of the second hydraulic cylinder when the ground is uneven, and the end of the second rigid arm is vertically displaced (namely, the rotation action of the second rigid arm relative to the second section arm connecting part 6) due to the hinge joint of the second rigid arm and the second section arm connecting part 6, so that the device is suitable for different high-low operation requirements of the ground such as road teeth and brush disc abrasion.

The first hydraulic oil cylinder and the second hydraulic oil cylinder are connected with oil supply equipment of the small-sized sweeper, and precise expansion and contraction are realized under the control of the control unit. The expansion and contraction of the hydraulic cylinder can be combined with memory (differential GPS triggering) and road surface monitoring pictures, the fluctuation and roadblock conditions of the road surface are judged according to the road surface monitoring pictures on the sweeper, and then the corresponding hydraulic cylinder is controlled by the control unit to work.

According to the invention, through innovative design of the first section arm and the second section arm and adoption of a linkage mode of the direct-acting oil cylinder, the oil cylinder is not easy to damage even if collision occurs, and the protection of important parts is enhanced. The oil cylinder is arranged above, reverse connection of the connecting piece is arranged in a reverse mode, telescopic interference is avoided, the third brush is in a contracted state, the oil cylinder for determining the expansion and contraction of the first arm is also in a contracted state, the structural state is firmer, and the device is more suitable for high-speed (higher-speed) movement of a vehicle under the self-transition working condition.

In one embodiment, as shown in fig. 6. The third brush mounting member 4 is fixedly connected with the vehicle body. The third brush mounting member 4 comprises a plate-shaped member fixedly connected with the vehicle body, a first connecting frame 4.2 used for being connected with a first arm is arranged on one side surface of the plate-shaped member, and a second connecting frame 4.3 is arranged at the end part of the first arm. The second connecting frame is in a horizontal U shape. The first connecting frame also comprises an upper part and a lower part, and forms a U shape which can be laid horizontally together with the plate-shaped piece. When in connection, the first connecting frame and the second connecting frame are connected in a plugging mode in the horizontal direction, and are electrically hinged in the vertical direction, and are controlled by the control unit. The upper surface of the second connecting frame 4.3 is provided with two limit detection pieces 4.4. The middle position of the upper surface of the first connecting frame 4.2 is provided with a proximity switch 4.1, when the second connecting frame 4.3 rotates relative to the first connecting frame 4.2, the proximity switch 4.1 detects left and right limit detection pieces 4.4, the positions of the two limit detection pieces 4.4 are used as left and right limits of rotation of the second connecting frame 4.3, and specifically, after the left limit or the right limit is detected, a control command is issued by the control unit immediately to stop rotation of the second connecting frame 4.3. The bottom of articulated department of first link 4.2 and second link 4.3 is equipped with physical limit structure 4.5, and physical limit structure 4.5 is including setting up the protruding and the protruding of setting on second link 4.3 on first link 4.2, and when second link 4.3 reached spacing position along the articulated shaft rotation, two protruding realization collision hinder the further rotation of second link to realize that first arm is spacing for the rotation of third brush installed part.

In one embodiment, as shown in fig. 7. The first rigid arm and the second rigid arm are respectively provided with a plurality of stay cord through holes, the stay cords are arranged along the first rigid arm and the second rigid arm through the stay cord through holes, the tail ends of the stay cords are fixedly connected with the stay pins 8, and the other ends of the stay cords are connected with the electric push rods. The stay cord mounting 11 secures the brake cable stay cord sheath. The brake cable stay cord comprises a sheath and an inner steel wire core, wherein the steel wire core is connected with a pull pin 8, and the sheath is fixed on a stay cord mounting piece 11. The top of the cleaning brush mounting member 10 is provided with a transverse strip hole 9, and the pull pin 8 is arranged in the strip hole 9 and the through hole on the pull rope mounting member 11 in a penetrating way. The diameter of the through hole on the pull rope mounting piece 11 is matched with the diameter of the pull pin 8, the pull pin 8 does not have displacement in the through hole of the pull rope mounting piece 11, and the pull pin 8 drives the pull rope mounting piece 11 by pulling the pull rope steel wire to realize the fixation of the outer skin. The width of the strip hole 9 is matched with the diameter of the pull pin 8, the pull pin 8 is longitudinally and longitudinally not displaced, and a limiting piece is arranged at the end part of the pull pin 8 passing through the strip hole 9, so that the pull pin 8 can be prevented from being separated from the strip hole. When the cleaning brush needs to swing left and right, the pull pin moves left and right along the strip hole 9, and meanwhile the torsion spring 7 provides reset torsion, so that the adaptation to the left and right swing of the wrist joint in a narrow space is realized. An electric push rod 1.3 is arranged along the first rigid arm, and a pull rope penetrates through the pull rope through holes of the second rigid arm and the first rigid arm and then is connected with the electric push rod 1.3, so that the tensioning and releasing of the steel wire core inside the pull rope are realized through the pulling of the electric push rod, and the left-right swing of the cleaning brush is realized.

The ends in this application all refer to the end that is remote from the vehicle body.

In a specific embodiment, as shown in fig. 8, the cleaning brush 3 comprises a rotating disk 3.1, a motor 3.2 arranged above the rotating disk and a brush 3.3 arranged below the rotating disk, wherein a motor shaft of the motor is arranged in the rotating disk in a penetrating manner to drive the rotating disk and the brush to rotate, a rotary centering structure 3.4 is arranged on the periphery of the motor shaft, the rotary centering structure 3.4 is integrally in a circular thick plate shape, the structure is sunken to accommodate a bearing protection prime mover, the thickness of the circular thick plate is more than 2 times that of the rotating disk, a bearing mounting hole 3.5 is arranged in the middle of the rotary centering structure and used for the motor shaft to penetrate into the mounting hole to be connected with a bearing, and then the cleaning brush is driven to rotate to realize cleaning. The sinking structure accommodates the bearing and can protect the prime motor such as the hydraulic motor. The motor shaft is designed into a conical structure 3.6 with a wide bottom and a narrow top, a better centering effect is realized through the conical structure, better dynamic balance controllability is obtained, and abnormal sound during rotary sweeping is further weakened.

The third brush structure of the small-sized sweeper provided by the embodiment of the application is described in detail. The above description of embodiments is only for aiding in understanding the method of the present application and its core ideas; meanwhile, as those skilled in the art will have modifications in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.

Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As referred to throughout the specification and claims, the terms "comprising," including, "and" includes "are intended to be interpreted as" including/comprising, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art is able to solve the technical problem within a certain error range, substantially achieving the technical effect. The description hereinafter sets forth the preferred embodiment for carrying out the present application, but is not intended to limit the scope of the present application in general, for the purpose of illustrating the general principles of the present application. The scope of the present application is defined by the appended claims.

Claims (4)

1. The third brush structure of the small-sized sweeper is characterized by comprising a first section arm, a second section arm, a sweeping brush and a third brush mounting piece fixedly connected with a vehicle body;

the third brush mounting piece, the first section arm, the second section arm and the cleaning brush are sequentially connected;

the first arm can rotate along the horizontal plane in a limiting way relative to the third brush mounting part;

the second arm section can be extended or folded relative to the first arm section;

the first arm comprises a first rigid arm and a first hydraulic cylinder fixedly arranged on the upper side of the first rigid arm;

the first rigid arm and the second arm-saving connecting piece are hinged; the end part of a piston rod of the first hydraulic oil cylinder is hinged with one end of a connecting piece which is reversely arranged; the other end of the reverse arrangement connecting piece is fixedly connected with the second section arm connecting piece;

the reverse arrangement connecting piece comprises a first connecting piece, a second connecting piece and a buffer piece;

one end of the first connecting piece is hinged with the end part of a piston rod of the first hydraulic oil cylinder, the other end of the first connecting piece is fixedly connected with one end of the second connecting piece through the buffer piece, and the other end of the second connecting piece is fixedly connected with the second knuckle arm connecting piece;

the first connector and the second connector are at an acute angle of no more than 30 degrees; the buffer piece is of a bidirectional torsion spring structure, and absorbs impact energy to protect other mechanisms when the tail end of the broom touches an obstacle on the left side or the right side;

the second section arm comprises a second hydraulic oil cylinder and a second rigid arm; the second hydraulic oil cylinder is fixedly connected with the second knuckle arm connecting piece; the second rigid arm is hinged with the second knuckle arm connecting piece;

the second hydraulic cylinder is arranged above the second rigid arm;

the end of the second rigid arm is provided with a sling fixing piece, and the end part of a piston rod of the second hydraulic oil cylinder is connected with the sling fixing piece through a sling or a chain; the tail end of the second section arm is fixedly provided with a pull rope mounting piece, and the pull rope mounting piece is connected with a cleaning brush mounting piece for connecting the cleaning brush through a torsion spring; the cleaning brush mounting piece is provided with a transverse strip hole, the pull rope mounting piece is provided with a through hole matched with a pull pin, and the pull pin passes through the through hole and the strip hole and then is prevented from falling by the limiting piece; the pull pin is fixedly connected with one end of the pull rope, and the other end of the pull rope sequentially penetrates through the plurality of pull rope through holes and then is connected with the electric push rod arranged at the first arm.

2. The third brush structure of the small-sized sweeper according to claim 1, wherein the third brush mounting member comprises a plate-shaped member fixedly connected with the sweeper body and a first connecting frame fixedly connected with the plate-shaped member; the end part of the first arm is provided with a second connecting frame; the first connecting frame is electrically hinged with the second connecting frame.

3. The third brush structure of the small-sized sweeper according to claim 2, wherein the first connecting frame is provided with a proximity switch, the second connecting frame is provided with a left limit detection member and a right limit detection member, the limit detection members are arranged opposite to the proximity switch, and the positions of the two limit detection members are used as left limit positions and right limit positions of the second connecting frame relative to the rotation of the first connecting frame.

4. The third brush structure of the small sweeper of claim 1 wherein the sweeper brush includes a rotating disc, a motor disposed above the rotating disc and a brush disposed below the rotating disc; a rotary centering structure is arranged in the middle of the rotary disk;

the whole rotary centering structure is in a circular plate shape;

a sinking type bearing mounting hole is formed in the middle of the rotary centering structure, and a motor shaft is inserted into the bearing mounting hole and connected with a bearing to drive the hairbrush to rotate;

the motor shaft is of a conical structure with a wide bottom and a narrow top.

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