Suction nozzle height adjustment device, road sweeper

Abstract

The present invention discloses a device for adjusting the height of a suction nozzle from the ground and a road sweeper. The device for adjusting the height of a suction nozzle from the ground comprises: a frame, an axle, a first connecting rod, a second connecting rod, a third connecting rod, a support rod, a sliding member, a flexible rope and a suction nozzle; wherein the top end of the first connecting rod and the top end of the second connecting rod are both hinged on the frame, the bottom end of the first connecting rod and the bottom end of the second connecting rod are both hinged on the support rod, and the first connecting rod and the second connecting rod are parallel and of equal length; the support rod is parallel to the frame, the sliding member is slidably arranged on the support rod along the length direction of the support rod, and the two ends of the flexible rope are respectively fixedly connected to the sliding member and the suction nozzle; the two ends of the third connecting rod are respectively hinged on the axle and the first connecting rod. The above-mentioned device for adjusting the height of the suction nozzle from the ground, in the case of eliminating the suction nozzle running wheel, cleverly utilizes the simultaneous deformation of the frame and the wheel when the mass of the whole vehicle changes, realizes real-time adaptive adjustment of the height of the suction nozzle from the ground, improves reliability, and reduces or even eliminates hysteresis.

Description

Technical Field

[0001] The invention relates to the technical field of road sweeping, and more particularly to a device for adjusting the height of a suction nozzle from the ground and a road sweeper. Background Art

[0002] The road sweeper uses the negative pressure generated by the centrifugal fan to pick up garbage on the ground through a suction nozzle with a small ground clearance. The suction nozzle and the ground constitute the working area of ​​the road sweeper to suck up garbage. The gap between the suction nozzle and the ground is the inlet of the cleaning airflow. The size of this inlet directly determines the air volume of the entire pneumatic system. The size of the air volume has a decisive influence on the working energy consumption of the centrifugal fan and the cleaning effect of the road sweeper. Therefore, the height of the suction nozzle from the ground is one of the most critical parameters of the operating performance of the road sweeper.

[0003] At present, a small diameter wheel is used to install the suction nozzle, and the height of the suction nozzle from the ground is controlled by adjusting the height of the suction nozzle on the wheel. Due to the small diameter of the wheel, its rotation speed is high during operation. As time goes by, the wheel is gradually worn out and must be replaced after a period of use. Replacing the wheel is not only time-consuming, but also increases the cost of use; in addition, the wheel is very rigid and has poor shock absorption, so it makes a lot of noise when running on rough roads.

[0004] In order to overcome the above shortcomings, the nozzle is hung on the frame, the height of the nozzle is adjusted by the cylinder, and a position sensor is set in front of the nozzle. By real-time monitoring of the height between the frame and the ground, the signal is fed back to the electronic control unit, and then the electronic control unit controls the cylinder to adjust the height of the nozzle from the ground in real time. The above design is relatively complicated. The position sensor is more likely to be contaminated and fail during operation. In addition, the sensor needs a long feedback time from collecting the height position signal to the controller and then to the cylinder, resulting in the height of the nozzle from the ground cannot be adjusted in real time, and there is a serious lag.

[0005] In summary, how to adjust the height of the suction nozzle from the ground to reduce hysteresis is a problem that needs to be urgently solved by those skilled in the art. Summary of the invention

[0006] The purpose of the present invention is to provide a device for adjusting the height of a suction nozzle from the ground, so as to achieve adaptive adjustment of the height of the suction nozzle from the ground, reduce or even eliminate hysteresis. Another purpose of the present invention is to provide a road sweeper having the device for adjusting the height of a suction nozzle from the ground.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A device for adjusting the height of a suction nozzle from the ground comprises: a frame, an axle, a first connecting rod, a second connecting rod, a third connecting rod, a supporting rod, a sliding member, a flexible cable and a suction nozzle;

[0009] Wherein, the top end of the first connecting rod and the top end of the second connecting rod are both hinged to the frame, the bottom end of the first connecting rod and the bottom end of the second connecting rod are both hinged to the support rod, and the first connecting rod and the second connecting rod are parallel and of equal length;

[0010] The support rod is parallel to the frame, the sliding member is slidably arranged on the support rod along the length direction of the support rod, and the two ends of the flexible cable are fixedly connected to the sliding member and the suction nozzle respectively;

[0011] Two ends of the third connecting rod are hinged on the axle and the first connecting rod respectively.

[0012] Preferably, the first connecting rod comprises: an upper connecting rod section and a lower connecting rod section, wherein the upper connecting rod section is located above the central horizontal plane of the axle, and the lower connecting rod section is located below the central horizontal plane of the axle;

[0013] The hinge point between the third link and the upper link segment is located at the midpoint of the upper link segment, and L 2 =2L 1 +2L 1 K 1 / K 2 ;

[0014] Among them, K 1 K is the elastic coefficient of the tire at rated tire pressure, 2 is the frame elastic coefficient, L 1 is the length of the third connecting rod, L 2 is the length of the first connecting rod, and the length of the upper connecting rod section is 2L 1 .

[0015] Preferably, the sliding member is located on a side of the second connecting rod away from the first connecting rod.

[0016] Preferably, the sliding member is a pulley, and the flexible cable is a chain.

[0017] Preferably, the device for adjusting the height of the suction nozzle from the ground also includes a driving device for driving the suction nozzle to rise and fall.

[0018] Preferably, the device for adjusting the height of the suction nozzle from the ground also includes: a first support fixed on the frame, a second support fixed to the top of the suction nozzle, a fourth connecting rod whose two ends are respectively hinged to the first support and the second support, and a fifth connecting rod whose two ends are respectively hinged to the first support and the second support, wherein the first support, the fourth connecting rod, the fifth connecting rod and the second support form a parallelogram structure.

[0019] Based on the above-mentioned device for adjusting the height of a suction nozzle from the ground, the present invention further provides a road sweeper, which comprises the device for adjusting the height of a suction nozzle from the ground as described in any one of the above-mentioned items.

[0020] In the device for adjusting the height of the suction nozzle from the ground provided by the present invention, the support rod is parallel to the frame, and the first connecting rod and the second connecting rod are parallel and of equal length, so the support rod, the frame, the first connecting rod and the second connecting rod form a parallelogram structure, and the third connecting rod hinged to the axle is hinged to the first connecting rod, so the simultaneous deformation of the frame and the wheel when the mass of the whole vehicle changes is cleverly utilized, and during the operation of the road sweeper, no matter how the height of the frame from the ground changes, the height of the support rod from the ground remains unchanged; as the support rod moves, the sliding part moves along the length direction of the support rod; when the suction nozzle is lowered, the flexible cable is straightened and always maintains a vertical direction, and the lower limit mechanism of the suction nozzle composed of the flexible cable and the support rod realizes the lower limit of the suction nozzle, so that the height of the suction nozzle from the ground remains unchanged, that is, the height of the suction nozzle from the ground always maintains the designed height, thereby realizing real-time adaptive adjustment of the height of the suction nozzle from the ground.

[0021] The device for adjusting the height of the suction nozzle from the ground provided by the present invention can achieve the maintenance of the ground height of the suction nozzle without removing the suction nozzle running wheels, thereby reducing the wearing parts of the road sweeper, reducing the later maintenance costs, and eliminating the noise generated by the suction nozzle running wheels; at the same time, the simultaneous deformation of the frame and the wheels when the mass of the entire vehicle changes is cleverly utilized to achieve real-time adaptive adjustment of the height of the suction nozzle from the ground. Compared with the prior art method using position sensors, the device improves reliability and reduces or even eliminates hysteresis. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0023] Figure 1 A simplified structural diagram of a device for adjusting the height of a suction nozzle from the ground provided in an embodiment of the present invention;

[0024] Figure 2 A geometric principle diagram of a device for adjusting the height of a suction nozzle from the ground provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] like Figure 1 As shown, the device for adjusting the height of a suction nozzle from the ground provided in an embodiment of the present invention comprises: a frame 1, an axle 11, a first connecting rod 3, a second connecting rod 4, a third connecting rod 12, a supporting rod 13, a sliding member 5, a flexible cable 14 and a suction nozzle 16;

[0027] The top ends of the first link 3 and the second link 4 are both hinged on the frame 1, and the bottom ends of the first link 3 and the second link 4 are both hinged on the support rod 13. The first link 3 and the second link 4 are parallel and of equal length. It can be understood that the support rod 13 is located at the bottom side of the frame 1.

[0028] The support rod 13 is parallel to the frame 1 , and the sliding member 5 is slidably disposed on the support rod 13 along the length direction of the support rod 13 .

[0029] Both ends of the flexible rope 14 are fixedly connected to the sliding member 5 and the suction nozzle 16 respectively, that is, one end of the flexible rope 14 is fixedly connected to the sliding member 5 , and the other end of the flexible rope 14 is fixedly connected to the suction nozzle 16 .

[0030] Both ends of the third link 12 are hinged to the axle 11 and the first link 3 respectively, that is, one end of the third link 12 is hinged to the axle 11 , and the other end of the third link 12 is hinged to the first link 3 .

[0031] The specific structure of the hinge is selected according to actual needs, and this embodiment does not limit it. The tire 2 is installed on the axle 11. The suction nozzle 16 is provided with a suction pipe 6 to guide the garbage to the collection structure.

[0032] In the device for adjusting the height of the suction nozzle from the ground provided by the embodiment of the present invention, the support rod 13 is parallel to the frame 1, and the first connecting rod 3 and the second connecting rod 4 are parallel and of equal length, so the support rod 13, the frame 1, the first connecting rod 3 and the second connecting rod 4 form a parallelogram structure, and the third connecting rod 12 hinged to the axle 11 is hinged to the first connecting rod 3, so that the simultaneous deformation of the frame 1 and the wheel when the mass of the whole vehicle changes is cleverly utilized, and the support rod 13 is realized regardless of how the height of the frame 1 from the ground changes during the operation of the road sweeper. The height above the ground remains unchanged; as the support rod 13 moves, the sliding member 5 moves along the length direction of the support rod 13; when the suction nozzle 16 is lowered, the flexible cable 14 is straightened and always maintains a vertical direction, and the lower limit mechanism of the suction nozzle 16 composed of the flexible cable 14 and the support rod 13 realizes the lower limit of the suction nozzle 16, so that the height of the suction nozzle 16 above the ground remains unchanged, that is, the height of the suction nozzle 16 above the ground always maintains the designed height, thereby realizing real-time adaptive adjustment of the height of the suction nozzle 16 above the ground.

[0033] The device for adjusting the height of the suction nozzle from the ground provided in the embodiment of the present invention can achieve the maintenance of the height of the suction nozzle 16 from the ground without removing the running wheels of the suction nozzle 16, thereby reducing the number of vulnerable parts of the road sweeper, reducing the subsequent maintenance costs, and eliminating the noise generated by the running wheels of the suction nozzle 16; at the same time, the device can cleverly utilize the simultaneous deformation of the frame 1 and the wheels when the mass of the entire vehicle changes, thereby achieving real-time adaptive adjustment of the height of the suction nozzle 16 from the ground, which improves reliability and reduces or even eliminates hysteresis compared with the prior art method using position sensors.

[0034] In order to ensure that the support rod 13 always moves in the vertical plane, the first link 3 is preferably selected to include: an upper link section and a lower link section, the upper link section is located at the upper part of the central horizontal plane of the axle 11, and the lower link section is located at the lower part of the central horizontal plane of the axle 11; the hinge point of the third link 12 and the upper link section is located at the midpoint of the upper link section, and L 2 =2L 1 +2L 1 K 1 / K 2 ; Among them, K 1 is the elastic coefficient of tire 2 at rated tire pressure, K 2 is the elastic coefficient of frame 1, L 1 is the length of the third connecting rod 12, L 2 is the length of the first connecting rod 3, and the length of the upper connecting rod section is 2L 1 .

[0035] It can be understood that the central horizontal plane of the axle 11 refers to the horizontal plane where the central axis of the axle 11 is located. The central horizontal plane of the axle 11 divides the first connecting rod 3 into an upper connecting rod section and a lower connecting rod section.

[0036] like Figure 2As shown in FIG. 1 , when the load of the road sweeper changes, the frame 1 is displaced in the vertical direction relative to the axle 11, and the height of the center horizontal plane of the axle 11 above the ground changes with the load of the road sweeper. That is, when the total mass of the road sweeper changes, its height above the ground changes by ΔM·K 1 At this time, the height change of the frame 1 relative to the center horizontal plane of the axle 11 is ΔM·K 2 Among them, ΔM is the total mass change during the operation of the road sweeper.

[0037] from Figure 2 It can be concluded that when the nozzle height adjustment device moves to the position shown by the dotted line, H 2 =ΔM·K 2 =2L 1 (sinα-sinα'), H 1 =(L 2 -2L 1 )*(sinα-sinα').

[0038] In the above formula, α is the angle between the frame 1 and the first connecting rod 3 before the overall mass of the road sweeper changes; α' is the angle between the frame 1 and the first connecting rod 3 after the overall mass of the road sweeper changes. It can be understood that no matter how the overall mass of the road sweeper changes, the angle between the frame 1 and the first connecting rod 3 is less than 90°.

[0039] In order to keep the support rod 13 at a constant height above the ground, the following conditions must be met: ΔM·K 1 =H 1 Therefore, it can be deduced that L 2 =2L 1 +2L 1 K 1 / K 2 .

[0040] The sliding member 5 is arranged on the support rod 13 and can be located between the first connecting rod 3 and the second connecting rod 4. In order to avoid the sliding member 5 interfering with the second connecting rod 4 and the first connecting rod 3, it is preferred that the sliding member 5 is located on the side of the second connecting rod 4 away from the first connecting rod 3.

[0041] Preferably, the sliding member 5 is a pulley, and the flexible cable 14 is a chain. Of course, the sliding member 5 can also be a slider, and the flexible cable 14 can be a steel cable or rope, etc., and is not limited to the above embodiments.

[0042] In order to realize the folding and lowering of the suction nozzle 16, the above-mentioned suction nozzle height adjustment device also includes a driving device 7 for driving the suction nozzle 16 to rise and fall. The driving device 7 is a cylinder or a linear motor, which is not limited in this embodiment.

[0043] In order to facilitate the suction nozzle 16 to remain parallel to the frame 1 and to ensure that the suction nozzle 16 remains parallel to the ground, it is preferred that the above-mentioned suction nozzle ground height adjustment device also includes: a first support 10 fixed on the frame 1, a second support 15 fixed to the top of the suction nozzle 16, a fourth connecting rod 8 whose two ends are respectively hinged to the first support 10 and the second support 15, and a fifth connecting rod 9 whose two ends are respectively hinged to the first support 10 and the second support 15; wherein the first support 10, the fourth connecting rod 8, the fifth connecting rod 9 and the second support 15 form a parallelogram structure.

[0044] The fourth connecting rod 8 is located above the fifth connecting rod 9. In order to avoid mutual interference, the second support 15 is located on the side of the flexible cable 14 away from the second connecting rod 4.

[0045] Based on the device for adjusting the height of a suction nozzle from the ground provided in the above embodiment, this embodiment further provides a road sweeper, which includes the device for adjusting the height of a suction nozzle from the ground described in the above embodiment.

[0046] Since the above-mentioned suction nozzle height adjustment device has the above-mentioned technical effect, and the above-mentioned road sweeper has the above-mentioned suction nozzle height adjustment device, the above-mentioned road sweeper also has the corresponding technical effect, which will not be repeated herein.

[0047] The type of the road sweeper is selected according to actual needs, and this embodiment does not limit this.

[0048] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for adjusting the height of a suction nozzle from the ground, characterized in that: include: A vehicle frame (1), a vehicle axle (11), a first connecting rod (3), a second connecting rod (4), a third connecting rod (12), a supporting rod (13), a sliding member (5), a flexible cable (14) and a suction nozzle (16); The top end of the first connecting rod (3) and the top end of the second connecting rod (4) are both hinged to the frame (1), the bottom end of the first connecting rod (3) and the bottom end of the second connecting rod (4) are both hinged to the support rod (13), and the first connecting rod (3) and the second connecting rod (4) are parallel and of equal length; The support rod (13) is parallel to the vehicle frame (1), the sliding member (5) is slidably arranged on the support rod (13) along the length direction of the support rod (13), and the two ends of the flexible cable (14) are respectively fixedly connected to the sliding member (5) and the suction nozzle (16); Two ends of the third connecting rod (12) are respectively hinged on the axle (11) and the first connecting rod (3); The first connecting rod (3) comprises an upper connecting rod section and a lower connecting rod section, the upper connecting rod section being located above the central horizontal plane of the axle (11), and the lower connecting rod section being located below the central horizontal plane of the axle (11); The hinge point between the third connecting rod (12) and the upper connecting rod section is located at the midpoint of the upper connecting rod section, and L2=2L1+2L1K1 / K2; K1 is the elastic coefficient of the tire (2) at the rated tire pressure, K2 is the elastic coefficient of the frame (1), L1 is the length of the third connecting rod (12), L2 is the length of the first connecting rod (3), and the length of the upper connecting rod section is 2L1; The device for adjusting the height of the suction nozzle from the ground further comprises a driving device (7) for driving the suction nozzle (16) to rise and fall.

2. The device for adjusting the height of the suction nozzle from the ground according to claim 1, characterized in that: The sliding member (5) is located on a side of the second connecting rod (4) away from the first connecting rod (3).

3. The device for adjusting the height of the suction nozzle from the ground according to claim 1, characterized in that: The sliding member (5) is a pulley, and the flexible cable (14) is a chain.

4. The device for adjusting the height of a suction nozzle from the ground according to any one of claims 1 to 3, characterized in that: Also includes: A first support (10) fixed on the frame (1), a second support (15) fixed to the top of the suction nozzle (16), a fourth connecting rod (8) having two ends respectively hinged to the first support (10) and the second support (15), and a fifth connecting rod (9) having two ends respectively hinged to the first support (10) and the second support (15); Wherein, the first support (10), the fourth connecting rod (8), the fifth connecting rod (9) and the second support (15) form a parallelogram structure.

5. A road sweeper, characterized in that: The device comprises a device for adjusting the height of a suction nozzle from the ground as claimed in any one of claims 1 to 4.

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