Hedge trimmer applied to municipal garden engineering

Abstract

The hedge trimmer comprises a traction vehicle head and a flat-bed trailer, a base is arranged on the left side of the middle of the flat-bed trailer, an extension arm extending rightwards is arranged at the top end of the base, the extension arm is provided with a lifting seat and an adjusting device for driving the lifting seat to ascend and descend, and the space below the lifting seat serves as a trimming cavity; the lifting seat is provided with a planetary pruning assembly driven by a pruning motor, baffles are arranged on the periphery of the flat-bed trailer to form a storage cavity located on the periphery of the base, and a conveying device for conveying branches generated by pruning of the pruning cavity from the pruning cavity to the storage cavity is arranged between the lifting seat and the flat-bed trailer. By the adoption of the scheme, the hedge trimmer applied to the municipal garden engineering guarantees the trimming effect and reduces manual participation.

Description

Technical Field

[0001] This invention relates to the field of municipal landscaping equipment, specifically to a hedge trimmer used in municipal landscaping projects. Background Technology

[0002] Municipal landscaping engineering refers to the management and construction of urban landscaping projects by specialized construction companies. Through artistic design and engineering techniques, it involves greening, beautifying, and landscaping urban land to improve the living environment and quality of life for urban residents. It typically includes landscaping drainage engineering, earthwork engineering, artificial rockery engineering, water feature engineering, paving engineering, and planting engineering. In the planting aspects of municipal landscaping projects, hedge trimmers are often used to trim the tops of hedges neatly, making the urban greenery more aesthetically pleasing.

[0003] Traditional hedge trimmers are mostly handheld hedge trimmers. These handheld hedge trimmers include a main unit, a handle located at the rear of the main unit to maintain its balance, and a blade located at the front of the main unit to perform the trimming action under the drive of the main unit. When trimming is needed, the operator holds the handle, aligns the blade with the top of the hedge, and then moves it horizontally along the hedge after starting the main unit. Because this method is time-consuming and labor-intensive, it is difficult to meet the needs of large-scale trimming.

[0004] To address the aforementioned issues, a vehicle-mounted hedge trimmer has emerged. This type of hedge trimmer includes a tractor unit, a flatbed trailer mounted behind the tractor unit, and a robotic arm mounted above the flatbed trailer. The movable end of the robotic arm is equipped with a main unit and a cutting head that performs trimming actions under the drive of the main unit. The robotic arm raises the cutting head to a height level with the top of the hedge. After starting the main unit, it travels along the hedge. After starting the main unit, the operator moves horizontally along the hedge, thereby improving trimming efficiency.

[0005] However, the aforementioned vehicle-mounted hedge trimmer still has the following problems: ① After the hedge is trimmed, the branches will be scattered on both sides of the road, requiring other staff to collect and process them along the hedge, which still consumes a lot of manpower and resources; ② The blade head often has multiple rotating circular blades arranged horizontally side by side. In order to ensure that the blades will not be damaged by collision, a safety gap is left between the blades. However, a small number of branches will pass through the safety gap without being trimmed, affecting the trimming effect. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a hedge trimming machine that can ensure the trimming effect and reduce manual intervention for use in municipal landscaping projects.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A tractor unit is included, with a flatbed trailer positioned behind it. A base is located on the left side of the middle section of the flatbed trailer. An extension arm extending to the right and outwards from the top of the base is provided. A lifting seat and an adjustment device for driving the lifting seat are located on the outer part of the extension arm. The space below the lifting seat serves as a trimming chamber. Multiple flexible belts encircling the trimming chamber are vertically arranged below the lifting seat. A central shaft is rotatably mounted inside the lifting seat. A trimming motor is mounted above the lifting seat. A drive sprocket is driven below the trimming motor. A transmission sprocket, connected by a chain, is fixedly mounted at the upper end of the central shaft at the same height as the drive sprocket. The lifting seat has a gear ring surrounding the lower end of the central shaft. A sun gear is fixedly mounted on the central shaft at the center of the gear ring. Multiple circumferentially arranged planetary gear shafts are arranged between the gear ring and the sun gear. The planetary gear shafts are respectively fixedly equipped with planetary gears that mesh with the outer circumference of the sun gear and the inner circumference of the gear ring. The lifting seat is located above the gear ring and has an upper limit wall that abuts against the upper side of each planetary gear. The upper limit wall has a guide groove along its circumference. The upper end of each planetary gear shaft is located in the guide groove and moves along the guide groove. The lifting seat is located below the gear ring and has a lower limit wall that abuts against the lower side of each planetary gear. The lower limit wall has a through hole in its middle. The lower end of the central shaft is located in the through hole and has a limiting plate that abuts against the lower side of each planetary gear. The outer circumference of the limiting plate and the inner circumference of the inner hole form an annular guide channel. The lower end of each planetary gear shaft is located in the guide channel and moves along the guide channel. The lower end of the planetary gear shaft extends to the pruning chamber and is equipped with a circular blade. The flatbed trailer is equipped with baffles around its perimeter to form a storage chamber around the base. A conveying device is provided between the lifting seat and the flatbed trailer to transfer the branches pruned in the pruning chamber from the pruning chamber to the storage chamber.

[0008] By adopting the above technical solution, during pruning, the tractor unit is first positioned parallel to the hedge and above the lifting seat. After starting the pruning motor, the adjusting device adjusts the pruning chamber to the required height. At this time, the conveying device is simultaneously activated to transfer the pruned branches from the pruning chamber to the storage chamber. Then, the tractor unit travels along the hedge until the entire hedge pruning work is completed. Finally, the branches collected in the storage chamber are dumped into the recycling station. The above structure has the following advantages: ① The planetary blade drive structure, composed of a sun gear, planetary gears, and a gear ring, not only rotates on its own axis but also revolves around the center during the blade cutting process, avoiding the problem of missed cuts due to the safety gap between the blades, thus ensuring both pruning efficiency and pruning effect; ② It makes reasonable use of the remaining space above the flatbed trailer, in conjunction with the conveying device, to store the pruned branches, avoiding the need for other workers to collect and process them along the hedge, saving manpower and resources; ③ During the collection of branches by the transport device, the curtain formed by the flexible belt combination does not affect the entry of branches from the top of the hedge into the pruning chamber, and the pruned branches are confined within the pruning chamber, ensuring the collection effect of the transport device.

[0009] The present invention is further configured such that each of the planetary gear shafts has two circular blades arranged vertically, with the diameter of the upper circular blade being smaller than that of the lower circular blade.

[0010] By adopting the above technical solution, the double-layer blade structure makes the branches entering the pruning chamber smaller in volume and easier to be transported by the conveying device. The upper small and lower large structure design allows the branches to have a certain amount of space to move after pruning and is not easy to get stuck in the upper dead corner.

[0011] The invention is further configured such that: the adjustment device includes a hydraulic cylinder fixed above the extension arm; the hydraulic cylinder drives a hydraulic shaft that passes through the extension arm and is fixedly engaged with the lifting seat; the extension arm has four guide holes arranged vertically around the hydraulic cylinder; the lifting seat is provided with guide rods corresponding to each guide hole and sliding vertically with the guide holes; the upper end of the guide rod is provided with an assisting disc; and the guide rod is sleeved with an assisting spring that is compressed between the assisting disc and the upper end face of the extension arm.

[0012] By adopting the above technical solution, the hydraulic cylinder is used as the driving source to provide reliable driving force for the lifting of the lifting seat. At the same time, the guide rod and guide hole make the lifting action of the lifting seat more accurate and stable. The booster spring compressed by the booster plate of the guide rod will always provide upward assistance to the lifting seat, making the lifting seat start more quickly when moving and more stable when stopping.

[0013] The invention is further configured such that: the conveying device includes a transmission pipe and a negative pressure pump; the transmission pipe is arranged in a left-right direction and is located on the front and rear sides of the lifting seat respectively; one end of the transmission pipe is an input end fixed to the lifting seat and connected to the trimming chamber, and the other end is an output end extending to the top of the storage chamber; a negative pressure generating seat is provided below the output end of the baffle; a negative pressure generating channel is arranged vertically on the negative pressure generating seat; a corrugated pipe is provided at the lower end of the output end and connected to the upper end of the negative pressure generating channel; the negative pressure pump is fixed to the base; the negative pressure pump is provided with negative pressure branch pipes that form a negative pressure environment in each negative pressure generating channel; a filter screen is provided at the connection between the negative pressure branch pipe and the negative pressure generating channel; and a discharge valve for opening or closing the negative pressure generating channel is provided below the negative pressure generating seat.

[0014] By adopting the above technical solution, the negative pressure generated by the negative pressure pump collects the branches pruned in the pruning chamber through the transmission pipeline. The branches reach the negative pressure generating channel through the transmission pipeline and corrugated pipe. After the branches accumulate to a certain extent, the discharge valve opens, the negative pressure is greatly reduced, and the branches fall into the storage chamber, realizing the automatic conveying of branches. During this process, since the discharge valve closes the lower end of the negative pressure generating channel most of the time, the negative pressure pump can generate sufficient and stable negative pressure to collect the branches, thereby ensuring the collection effect. At the same time, a filter screen is installed at the connection between the negative pressure branch pipeline and the negative pressure generating channel to prevent debris from entering the negative pressure pump and ensure the stable operation of the negative pressure pump.

[0015] The present invention is further configured such that: the cross-section of the input end of the transmission pipe is trapezoidal and the lower base of the trapezoid is connected to the trimming cavity, and the upper base faces away from the trimming cavity.

[0016] By adopting the above technical solution, the trapezoidal cross-section of the input end increases the area of ​​the transmission pipe for collecting tree branches. On the other hand, the pruned tree branches bounce towards the transmission pipe under the guidance of the trapezoidal slope of the input end, thereby comprehensively improving the comprehensiveness and efficiency of tree branch collection.

[0017] The present invention is further configured such that: the negative pressure generating seat is located on the left side of the storage cavity, and the bottom surface of the storage cavity is inclined and gradually decreases in height from left to right.

[0018] By adopting the above technical solution, the negative pressure generator unloads the branches to the left side of the storage chamber. Since the bottom of the storage chamber is inclined, the branches will move to the right side first along the bottom, making full use of the storage chamber space.

[0019] The invention is further configured such that: the storage cavity is provided with a discharge port on the right side, and a baffle on the right side of the storage cavity closes the discharge port. The baffle is hinged to a flatbed trailer below and opens the discharge port when overturned to form a discharge ramp connecting to the ground.

[0020] By adopting the above technical solution, the right baffle, as a component of the storage chamber, can also open the unloading port and form an unloading ramp that connects to the ground by flipping outward, making it easier to unload the branches stored in the storage chamber to the outside. In addition, the bottom of the storage chamber is inclined, and the inclination direction is consistent with the unloading ramp, which further makes the unloading smoother and more efficient. Attached Figure Description

[0021] Figure 1 Three-dimensional representation of a specific embodiment of the present invention Figure 1 ;

[0022] Figure 2 Three-dimensional representation of a specific embodiment of the present invention Figure 2 ;

[0023] Figure 3 This is a schematic diagram of the left-right structure of the trimming cavity;

[0024] Figure 4 This is a schematic diagram of the structure of the trimming cavity in the front-to-back direction;

[0025] Figure 5 This is a schematic diagram of the negative pressure generator. Detailed Implementation

[0026] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] like Figure 1 — Figure 5As shown, this invention discloses a hedge trimmer for municipal landscaping projects, including a tractor unit 1, a flatbed trailer 2 located behind the tractor unit 1, a base 3 located on the left side of the middle of the flatbed trailer 2, an extension arm 31 extending to the right and to the outside of the flatbed trailer 2 located at the top of the base 3, a lifting seat 4 located below the extension arm 31 and an adjustment device for driving the lifting seat 4 to rise and fall, the space below the lifting seat 4 serving as a trimming cavity 41, multiple flexible belts 42 arranged vertically around the trimming cavity 41 below the lifting seat 4, a central shaft 43 rotatably mounted inside the lifting seat 4, a trimming motor 44 located above the lifting seat 4, and a drive mechanism located below the trimming motor 44. A transmission sprocket 431, connected to the drive sprocket 441, is fixedly mounted at the upper end of the central shaft 43 at the same height as the drive sprocket 441. A gear ring 45 surrounds the lower end of the central shaft 43. A sun gear 432 is fixedly mounted at the center of the gear ring 45. Multiple circumferentially arranged planetary gear shafts 46 (usually three) are arranged between the gear ring 45 and the sun gear 432. Each planetary gear shaft 46 is fixedly mounted with a planetary gear 461 that meshes with the outer circumference of the sun gear 432 and the inner circumference of the gear ring 45. An upper limit wall 48, abutting against the upper side of each planetary gear 461, is located above the gear ring 45 on the lifting seat 4. The upper limit wall 48 extends along... A guide groove 481 is provided circumferentially. The upper ends of each planetary gear shaft 45 are located within the guide groove 481 and move along the guide groove 481. The lifting seat 4 is located below the gear ring 45 and is provided with a lower limiting wall 49 that abuts against the lower side of each planetary gear 461. A through hole 491 is provided in the middle of the lower limiting wall 49. The lower end of the central shaft 43 is located within the through hole 491 and is provided with a limiting disk 433 that abuts against the lower side of each planetary gear 461. An annular guide channel 492 is formed between the outer periphery of the limiting disk 433 and the inner periphery of the inner hole 491. The lower ends of each planetary gear shaft 46 are located within the guide channel 492 and move along the guide channel 492. The lower ends of the planetary gear shaft 46 extend to the trimming cavity 41 and are provided with a circular blade 46. 2. The flatbed trailer 2 is equipped with baffles 21 around its perimeter, forming a storage cavity 22 around the base 3. A conveying device is provided between the lifting seat 4 and the flatbed trailer 2 to transfer the branches pruned in the pruning cavity 41 from the pruning cavity 41 to the storage cavity 22. During pruning, the tractor head 1 is first driven to a position parallel to the hedge and above the lifting seat 4. After starting the pruning motor 44, the adjusting device adjusts the pruning cavity 41 to the required height. At this time, the conveying device is simultaneously turned on to transfer the pruned branches from the pruning cavity 41 to the storage cavity 22. Then, the tractor head 1 travels along the hedge until the entire hedge pruning work is completed. Finally, the branches collected in the storage cavity 22 are dumped into the garbage recycling station.The above structure has the following advantages: ① The planetary blade drive structure, composed of the sun gear 432, planetary gear 461, and gear ring 45, not only rotates on its own axis but also revolves around the center during the blade cutting process, avoiding the problem of missed cuts in the hedge due to the safety gap between the blades, thus ensuring both pruning efficiency and pruning effect; ② It makes reasonable use of the remaining space above the flatbed trailer 2, in conjunction with the conveying device, to store the branches produced during pruning, avoiding the need for other workers to collect and process them along the hedge, saving manpower and resources; ③ During the process of collecting branches by the transport device, the curtain formed by the flexible belt 42 does not affect the entry of branches at the top of the hedge into the pruning chamber 41, and the branches produced during pruning are confined within the pruning chamber 41, ensuring the collection effect of the transport device.

[0029] Each planetary gear shaft 46 has two circular blades 462 arranged vertically. The diameter of the upper circular blade 462 is smaller than that of the lower circular blade 462. The double-layer blade structure makes the branches entering the pruning chamber 41 smaller in volume and easier to be transported by the conveying device. The upper-smaller-lower-larger structure design allows the branches to have a certain amount of space to move after pruning and is less likely to get stuck in the upper dead corner.

[0030] The adjustment device includes a hydraulic cylinder 32 fixed above the extension arm 31. The hydraulic cylinder 32 drives a hydraulic shaft 321 that passes through the extension arm 31 and is fixedly engaged with the lifting seat 4. The extension arm 31 has four guide holes 311 arranged vertically around the hydraulic cylinder 32. The lifting seat 4 is provided with guide rods 47 that slide vertically with each guide hole 311. An assist plate 471 is provided at the upper end of the guide rod 47. An assist spring 472 compressed on the assist plate 471 and the upper end face of the extension arm 31 is sleeved on the guide rod 47. The hydraulic cylinder 32 serves as the driving source to provide reliable driving force for the lifting of the lifting seat 4. At the same time, the guide rod 47, in conjunction with the guide holes 311, makes the lifting action of the lifting seat 4 more accurate and stable. The assist spring 472 compressed by the assist plate 471 of the guide rod 47 will always provide upward assistance to the lifting seat 4, making the lifting seat 4 start more quickly when moving and more stable when stopping.

[0031] The conveying device includes a transmission pipe 5 and a negative pressure pump 6. The transmission pipe 5 is arranged in a left-right direction and is located on the front and rear sides of the lifting base 4 respectively. One end of the transmission pipe 5 is an input end 51 fixed to the lifting base 4 and connected to the trimming chamber 41, and the other end is an output end 52 extending to the top of the storage chamber 22. A negative pressure generating seat 7 is arranged below the output end 52, and the negative pressure generating seat 7 is arranged vertically with a negative pressure generating channel 71 (the size of the negative pressure generating channel 71 in the attached figure is only schematic and can be adjusted according to the size of the transmission pipe 5 to meet the unloading requirements). A corrugated pipe 53 is arranged at the lower end of the output end 52 and the upper end of the negative pressure generating channel 71 (the corrugated pipe 53 in the attached figure is only schematic and can be lengthened or shortened in practice, or different lengths of corrugated pipe 53 can be replaced according to actual needs). The negative pressure pump 6 is fixed to the base 3, and the negative pressure pump 6 is provided with negative pressure branch pipes 61 to form a negative pressure environment in each negative pressure generating channel 71. A filter screen 62 is installed at the connection between the negative pressure branch pipe 61 and the negative pressure generating channel 71. A discharge valve 72 (electrically driven valve) is installed below the negative pressure generating seat 7 to open or close the negative pressure generating channel 71. The negative pressure generated by the negative pressure pump 6 collects the branches pruned by the pruning chamber 41 through the transmission pipe 5. The branches reach the negative pressure generating channel 71 through the transmission pipe 5 and the bellows 53. After the branches accumulate to a certain extent, the discharge valve 72 opens, and the negative pressure is greatly reduced (the pump can also be stopped for tens of seconds). The branches fall into the storage chamber 22, realizing the automatic conveying of branches. During this process, since the discharge valve 72 closes the lower end of the negative pressure generating channel 71 most of the time, the negative pressure pump 6 can generate sufficient and stable negative pressure to collect the branches, thereby ensuring the collection effect. At the same time, a filter screen 62 is installed at the connection between the negative pressure branch pipe 61 and the negative pressure generating channel 71 to prevent debris from entering the negative pressure pump 6 and ensure the stable operation of the negative pressure pump 6.

[0032] The cross-section of the input end 51 of the transmission pipe 5 is trapezoidal, with the lower base a of the trapezoid connected to the trimming cavity 41 and the upper base b facing away from the trimming cavity 41. The trapezoidal cross-section of the input end 51 increases the area of ​​the transmission pipe 5 for collecting branches. On the other hand, the trimmed branches bounce towards the transmission pipe 5 under the guidance of the trapezoidal slope of the input end 51, thereby comprehensively improving the comprehensiveness and efficiency of branch collection.

[0033] The negative pressure generating seat 7 is located on the left side of the storage cavity 22. The bottom surface c of the storage cavity 22 is inclined and the height gradually decreases from left to right. The negative pressure generating seat 7 unloads the branches to the left side of the storage cavity 22. Since the bottom surface of the storage cavity 22 is inclined, the branches will move to the right side first along the bottom surface, making full use of the space of the storage cavity 22.

[0034] The storage chamber 22 is provided with a discharge port 23 on the right side. A baffle 21 on the right side of the storage chamber 22 closes the discharge port 23 (usually kept closed by a locking hook, not shown in the figure). The baffle 21 is hinged to the flatbed trailer 2 below and opens the discharge port 23 when it is flipped outward to form a discharge ramp d connecting to the ground. The right baffle 21 is part of the storage chamber 22 and can also open the discharge port 23 by flipping outward to form a discharge ramp c connecting to the ground, making it easier to unload the branches stored in the storage chamber 22 to the outside. In addition, the bottom surface of the storage chamber 22 is inclined, and the inclination direction is consistent with the discharge ramp, which further makes the unloading smoother and more efficient.

Claims

1. A hedge trimmer applied to municipal garden engineering, comprising a tractor head, a flatbed trailer is arranged behind the tractor head, characterized in that: The left side of the middle of the flatbed trailer is provided with a base, the top end of the base is provided with an extension arm extending to the outside of the flatbed trailer, the part of the extension arm outside the flatbed trailer is provided with a lifting seat below and an adjusting device driving the lifting seat to lift, the space below the lifting seat is used as a pruning cavity, a plurality of flexible belts surrounding the pruning cavity are vertically arranged below the lifting seat, a central shaft is rotatably arranged in the lifting seat, a pruning motor is arranged above the lifting seat, a driving sprocket is drivingly arranged below the pruning motor, a transmission sprocket is fixedly arranged on the central shaft at a position with the same height as the driving sprocket and is in transmission cooperation with the driving sprocket through a chain, the lifting seat is provided with a gear ring surrounding the lower end of the central shaft, the central shaft is fixedly provided with a sun gear at the center of the gear ring, a plurality of planetary gear shafts are arranged between the gear ring and the sun gear, each planetary gear shaft is fixedly provided with a planetary gear meshing with the outer periphery of the sun gear and the inner periphery of the gear ring, an upper limiting wall abutting against the upper side of each planetary gear is arranged above the gear ring of the lifting seat, the upper limiting wall is provided with a guide groove in the circumferential direction, the upper end of each planetary gear shaft is located in the guide groove and moves along the guide groove, a lower limiting wall abutting against the lower side of each planetary gear is arranged below the gear ring of the lifting seat, a through hole is arranged in the middle of the lower limiting wall, a limiting disc abutting against the lower side of each planetary gear is arranged in the through hole of the lower end of the central shaft, an annular guide channel is formed between the outer periphery of the limiting disc and the inner periphery of the through hole, the lower end of each planetary gear shaft is located in the guide channel and moves along the guide channel, the lower end of the planetary gear shaft extends to the pruning cavity and is provided with a circular blade, baffles are arranged around the flatbed trailer to form a storage cavity around the base, a conveying device is arranged between the lifting seat and the flatbed trailer to convey branches generated by pruning in the pruning cavity to the storage cavity.

2. The hedge trimmer for municipal landscaping work according to claim 1, characterized in that: The number of the circular blades of each planetary gear shaft is two and arranged in an upper-lower arrangement, the diameter of the upper circular blade is smaller than that of the lower circular blade.

3. The hedge trimmer for municipal landscaping work according to claim 1, characterized in that: The adjusting device comprises a hydraulic cylinder fixed above the extension arm, a hydraulic shaft penetrating through the extension arm and fixedly matched with the lifting seat is drivingly arranged downward from the hydraulic cylinder, four guide holes surrounding the hydraulic cylinder are vertically arranged in the extension arm, a guide rod vertically slidingly matched with each guide hole is arranged in the lifting seat corresponding to each guide hole, a booster disc is arranged at the upper end of the guide rod, a booster spring is sleeved on the guide rod and compressed between the booster disc and the upper end surface of the extension arm.

4. The hedge trimmer for municipal landscaping work according to claim 1, characterized in that: The conveying device comprises a transmission pipe and a negative pressure pump, the transmission pipe is arranged along the left-right direction and is respectively located at the front and back sides of the lifting seat, one end of the transmission pipe is an input end fixed to the lifting seat and communicated with the trimming cavity, the other end is an output end extended to above the storage cavity, the baffle is arranged below the output end and provided with a negative pressure generating seat, the negative pressure generating seat is arranged along the vertical direction and provided with a negative pressure generating channel, the lower end of the output end is communicated with the upper end of the negative pressure generating channel and provided with a bellows, the negative pressure pump is fixed to the base, the negative pressure pump is respectively provided with a negative pressure branch pipe forming a negative pressure environment in each negative pressure generating channel, a filter screen is arranged at the connection between the negative pressure branch pipe and the negative pressure generating channel, and a discharge valve is arranged below the negative pressure generating seat and used for opening or closing the negative pressure generating channel.

5. The hedge trimmer for municipal landscaping work according to claim 4, characterized in that: The cross section of the input end of the transmission pipe is in a trapezoidal shape, and the lower base of the trapezoidal shape is communicated with the trimming cavity, and the upper base faces away from the trimming cavity.

6. The hedge trimmer for municipal landscaping work according to claim 4, characterized in that: The negative pressure generating seat is located at the left side of the storage cavity, and the bottom surface of the storage cavity is in an inclined shape and gradually decreases in height from left to right.

7. The hedge trimmer for municipal landscaping work according to claim 6, characterized in that: The storage cavity is provided with a discharge port located at the right side, and a baffle located at the right side of the storage cavity closes the discharge port, the baffle is hinged to the flatbed trailer below and forms a discharge ramp abutting the ground when turned outward and opens the discharge port.

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