A work implement

Abstract

The application discloses a working machine tool, which comprises a shield assembly and a cutter installed in the shield assembly, the shield assembly comprises side shields located on both sides of the cutter and a top shield covering the top of the cutter, and the cutter is horizontally arranged in the shield assembly; wherein, the entrance end of the shield assembly is provided with a movable shield, and the movable shield is movably connected with the shield assembly and the movable range thereof is adjustable. In the application, when the movable shield is arranged at the entrance end of the shield assembly, the degree of the movable shield pressing the grass can be adjusted when the grass passes through the movable shield during mowing, the grass binding force can be changed, the cutter is convenient for mowing, and the mowing effect of the cutter is ensured. Compared with the prior art, the movable shield structure in the application is simpler, the maintenance is more convenient, and the function of adjusting the grass pressing degree is added. After the swing range of the movable shield is adjusted, the height of the movable shield can be adjusted, so that the grassland of different heights can be adapted, and the mowing effect is further ensured.

Description

Technical Field

[0001] This invention relates to a work implement, specifically a work implement with a grass-pressing structure. Background Technology

[0002] A lawnmower, also known as a lawn trimmer, is a mechanical tool used for mowing lawns, vegetation, etc. It consists of a blade disc, engine, wheels, a walking mechanism, blades, a handle, and a control unit. Driven by the high-speed rotation of the engine, the blades cut through the vegetation, greatly improving work efficiency, saving lawnmower workers' time, and significantly reducing manpower costs.

[0003] Chinese patent document CN104885687A discloses a grass-pressing structure for a lawnmower and the lawnmower itself, including a roller, two wheels, a handle, and two sets of adjustment devices. The wheels are rotatably connected to the lawnmower body, and a positioning shaft is fixed relative to the lawnmower body. Each set of adjustment devices includes a first connecting rod, a second connecting rod, and a bent third connecting rod. The two ends of the first connecting rod are rotatably connected to the handle and the second connecting rod, respectively. The two ends of the second connecting rod are rotatably connected to the first connecting rod and the third connecting rod, respectively. The two ends of the third connecting rod are connected to one end of the roller and the second connecting rod, respectively. The bent part of the third connecting rod is rotatably connected to one end of the positioning shaft, and the bent part of the third connecting rod is higher than the axis of the roller. A height adjustment rod parallel to the positioning shaft is also provided between the two connection points of the second and third connecting rods of the two sets of adjustment devices. The height adjustment rod is rotatably connected to the second connecting rod. When the wheels are raised or lowered, the height of the roller of the grass-pressing mechanism remains unchanged, ensuring that the grass-pressing effect is fully utilized.

[0004] The prior art has the following drawbacks: Although the prior art can achieve the grass pressing effect to ensure the mowing effect, the complex grass pressing structure increases the production and maintenance costs of the mower. Summary of the Invention

[0005] To address the technical problem of increased costs due to complex grass-pressing structures in existing lawnmowers, this invention provides a working implement comprising a protective cover assembly and blades installed within the protective cover assembly. The protective cover assembly includes side guards on both sides of the blades and a top guard covering the top of the blades. The blades are horizontally positioned within the protective cover assembly. A movable protective cover is provided at the inlet end of the protective cover assembly, and this movable cover is movably connected to the protective cover assembly and its range of motion is adjustable.

[0006] Note: In this solution, the inlet end refers to the end where the grass enters the protective cover assembly.

[0007] In this design, a movable cover is installed at the inlet end of the cover assembly. During mowing, the degree to which the movable cover compresses the grass as it passes over it is adjustable, allowing for variable binding force and facilitating effective cutting by the blades. Compared to existing technologies, the movable cover in this design has a simpler structure, is easier to maintain, and adds the function of adjusting the grass compression level. Furthermore, the adjustable swing range of the movable cover allows for height adjustment, adapting to grasses of different heights and further ensuring effective mowing.

[0008] Preferably, a first limiting device is provided between the movable cover and the cover assembly to limit the swing range of the movable cover. In this design, the first limiting device facilitates the adjustment of the swing range of the movable cover and has a simple structure.

[0009] Preferably, the first limiting device includes a limiting hole and a limiting pin that can be inserted into the limiting hole. The limiting hole is located on the protective cover assembly and / or the movable protective cover, and the limiting holes can be distributed around the hinge point axis of the movable protective cover with the same radius. In this solution, the swing range of the movable protective cover is adjusted by the cooperation of the limiting hole and the limiting pin. When the limiting pin passes through the pin hole on both the protective cover assembly and the movable protective cover, the movable protective cover can be fixed at the corresponding angle. When the limiting pin is only installed on one side of the protective cover assembly or the movable protective cover, when the movable protective cover swings upward to a certain angle, it will work with the protective cover assembly to apply a shearing force to the limiting pin, thereby limiting the angle of upward or downward floating and swinging of the movable protective cover through the limiting pin. The structure is simple.

[0010] Preferably, the system further includes a second limiting device to restrict the downward swinging tendency of the movable shield under gravity. In this design, the second limiting device effectively restricts the downward swinging tendency of the movable shield, resulting in a simple structure.

[0011] Preferably, the second limiting device is a protrusion, support point, or deformable part on the movable cover that abuts against the cover assembly. In this solution, the downward swing tendency of the movable cover is limited by the protrusion, support point, or deformable part on the movable cover abutting against the cover assembly, resulting in a simple structure.

[0012] Preferably, an inner protective plate is detachably installed on the inner side of the shield assembly. In this embodiment, the detachable inner protective plate can protect the shield assembly, reduce the possibility of it being penetrated, and reduce maintenance costs.

[0013] Preferably, the cutting tool includes a spindle welding assembly, a blade mounting shaft, a swivel blade, and a limiting component. The spindle welding assembly has several blade mounting shafts evenly distributed around its axis of rotation. Multiple sets of swivel blades are loosely fitted onto the blade mounting shafts. The limiting component restricts the axial movement of the blade mounting shafts along the spindle welding assembly. In this design, the swivel of the swivel blades achieves the functions of cutting grass and avoiding collisions with hard objects. The blade mounting shafts facilitate the mounting of the swivel blades on the spindle welding assembly, resulting in a simple structure. Furthermore, the limiting component's restriction on the lateral movement of the blade mounting shafts prevents them from detaching from their mounting positions, further simplifying the design.

[0014] Preferably, the spindle welding assembly includes a central shaft and a mounting plate. The mounting plate has several mounting positions evenly distributed around the circumference of the central shaft axis, and the blade mounting shaft passes through the corresponding mounting position on the mounting plate. In this design, the uniform distribution of the blade mounting shaft around the rotation axis of the spindle welding assembly is achieved by utilizing the cooperation between the mounting positions on the mounting plate and the blade mounting shaft, resulting in a simple structure.

[0015] Preferably, the spindle welding assembly is further provided with a blade spacer sleeve, and the blade mounting shaft also passes through the inside of the spacer sleeve. Several swivel blades are arranged circumferentially on the spindle welding assembly through the blade spacer sleeve. In this solution, the blade spacer sleeve enables the arrangement of the blade mounting shaft in the circumferential direction of the spindle welding assembly, resulting in a simple structure.

[0016] Preferably, a primary symmetry plane is provided on the main shaft welding assembly. The same number of secondary symmetry planes are symmetrically arranged on each blade mounting axis, with the same number of secondary symmetry planes on each blade mounting axis. The same number and types of swivel blades are provided on the secondary symmetry planes symmetrically arranged about the primary symmetry plane, and the theoretical center of gravity of the corresponding swivel blades is concentrated on the corresponding secondary plane. The types of blades and the total number of each type of swivel blade are the same on each blade mounting axis. With the primary symmetry plane as the boundary, the swivel blades on either side are evenly distributed along the axial direction of the main shaft welding assembly. The axial projection interval between two adjacent sets of swivel blades is the same, and the axial projection interval distance on each side of the swivel blades on the primary symmetry plane is consistent with the axial projection interval distance on the other side. The structural design of the main shaft welding assembly in this scheme can achieve better mowing results.

[0017] Preferably, the swivel blade includes a sharpened cutting edge and an unsharpened shank. The shank is loosely fitted onto the blade mounting shaft, and when the swivel blade swings freely, the shank contacts the central shaft. This design, where the shank contacts the central shaft, prevents the cutting edge from impacting the central shaft during swing, thus avoiding damage to the central shaft and / or the blade. Preferably, the side guard plate of the protective cover assembly has a notch. The spindle welding assembly is housed within the protective cover assembly through the notch. A sealing plate is detachably connected to the notch. Bearings and bearing seats are used to mount the spindle welding assembly on both sides of the side guard plate and the sealing plate. Cutter shaft protective rings are installed at both ends of the spindle welding assembly. These protective rings are detachably connected to the protective cover assembly and are located inside the side guard plate. In this design, the notch on the side guard plate facilitates the installation of the entire spindle welding assembly within the guard assembly, which is then sealed by a separately designed sealing plate. This facilitates the installation of the spindle welding assembly and improves after-sales maintenance efficiency, resulting in a simple structure. The bearings and bearing housings facilitate the installation of the spindle welding assembly on the side guard plate and the sealing plate. The installation of the cutter shaft protective ring can partially enclose both ends of the spindle welding assembly within the cutter shaft protective ring, thus meeting the requirement for the spindle welding assembly to be installed through the notch, further simplifying the structure. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of a work implement of the present invention;

[0019] Figure 2 for Figure 1 Top view;

[0020] Figure 3 for Figure 2 Sectional view of AA;

[0021] Figure 4 for Figure 2 BB section view;

[0022] Figure 5 for Figure 4 CC section view;

[0023] Figure 6 for Figure 4 DD section view;

[0024] Figure 7 A partial schematic diagram of the spindle welding assembly;

[0025] Figure 8 This is a schematic diagram of the protective cover assembly;

[0026] Figure 9 This is a schematic diagram of a sealing plate. Detailed Implementation

[0027] The following detailed description illustrates the specific implementation method:

[0028] The reference numerals in the accompanying drawings include: bearing housing 1, bearing 2, spindle welding assembly 3, blade mounting shaft 4, blade spacer sleeve 5, limiting component 6, swivel blade 7, blade shaft protective ring 8, sealing plate 9, limit pin 10, movable guard 11, inner guard plate 12, guard assembly 13, side guard plate 14, second limiting device 15, limiting hole 16, mounting bolt 17, mounting pin 18, notch 19.

[0029] The basic implementation examples are as follows: Figure 1-9 As shown: A working tool includes a protective cover assembly 13 and a cutting tool installed inside the protective cover assembly 13. The protective cover assembly 13 includes side protective plates 14 located on both sides of the cutting tool and a top protective plate covering the top of the cutting tool. The cutting tool is horizontally arranged inside the protective cover assembly 13. The protective cover assembly 13 is detachably equipped with an inner protective plate 12, which is connected to the top protective plate by mounting bolts 17 and mounting pins 18.

[0030] The inlet end of the protective cover assembly 13 is provided with a movable protective cover 11. Specifically, the movable protective cover 11 is hinged to the protective cover assembly 13 and its swing range is adjustable. A first limiting device for limiting the swing range of the movable protective cover 11 and a second limiting device 15 for limiting the downward swing tendency of the movable protective cover 11 under the action of gravity are provided between the movable protective cover 11 and the protective cover assembly 13.

[0031] The first limiting device includes a limiting hole 16 and a limiting pin 10 that can be inserted into the limiting hole 16. The limiting hole 16 is located on the protective cover assembly 13 and / or the movable protective cover 11. Multiple limiting holes 16 are provided and distributed around the hinge point axis of the movable protective cover 11 with the same radius. In this embodiment, the limiting hole 16 is located on both the protective cover assembly 13 and the movable protective cover 11. In other embodiments, the limiting hole 16 is located on either the protective cover assembly 13 or the movable protective cover 11. When it is necessary to adjust the range of motion of the movable protective cover 11, the limiting holes 16 at different positions on the protective cover assembly 13 and the movable protective cover 11 are aligned, and then the limiting pin 10 is inserted for fixation.

[0032] The second limiting device 15 is a protrusion on the movable cover 11 that abuts against the cover assembly 13. In other embodiments, the second limiting device 15 may also be a deformable part on the movable cover 11 that abuts against the cover assembly 13 or a support point on the side of the cover assembly 13 that abuts against the movable cover 11.

[0033] The cutting tool includes a spindle welding assembly 3, insert mounting shafts 4, insert spacer sleeves 5, and swivel inserts 7. The spindle welding assembly 3 has several insert mounting shafts 4 evenly distributed around its axis of rotation. Multiple sets of swivel inserts 7 are loosely fitted onto the insert mounting shafts 4. Specifically, the spindle welding assembly 3 includes a central shaft and mounting plates on both sides. Several mounting positions are evenly distributed on the mounting plates around the axis of the central shaft, and the insert mounting shafts 4 pass through corresponding mounting positions on the side mounting plates. The insert mounting shafts 4 are also equipped with limiting members 6 that restrict the left and right movement of the insert mounting shafts 4 along the mounting positions. The limiting members 6 are limiting bolts located at both ends of the insert mounting shafts 4. The central shaft is equipped with insert spacer sleeves 5, and the several insert mounting shafts 4 are arranged circumferentially around the spindle welding assembly 3 through the insert spacer sleeves 5.

[0034] The swivel blade 7 includes a sharpened blade portion and an unsharpened handle portion. The handle portion is loosely fitted onto the blade mounting shaft 4. When the swivel blade 7 swings freely, the handle portion contacts the central shaft.

[0035] A primary symmetry plane is provided on the main shaft welding assembly 3. The same number of secondary symmetry planes are symmetrically arranged on each blade mounting shaft 4, with the same number of secondary symmetry planes on each blade mounting shaft 4. In this embodiment, there are two secondary symmetry planes. The same number and types of swivel blades 7 are provided on the secondary symmetry planes symmetrically arranged about the primary symmetry plane, and the theoretical center of gravity of the corresponding swivel blades 7 is concentrated on the corresponding secondary plane. With the primary symmetry plane as the boundary, the swivel blades 7 on either side are evenly distributed axially on the main shaft welding assembly 3. The axial projection interval between two adjacent sets of swivel blades 7 is the same, and the axial projection interval distance on each side of the swivel blades 7 on the main symmetry plane is consistent with the axial projection interval distance on the other side. The structural design of the main shaft welding assembly 3 in this scheme achieves better mowing results.

[0036] The side guard plate 14 of the protective cover assembly 13 has a downward-facing notch 19 at its lower end. The main shaft welding assembly 3 is inserted into the protective cover assembly 13 through the notch 19. A sealing plate 9 is detachably connected to the notch 19. Figure 8 and Figure 9 As shown.

[0037] The spindle welding assembly 3 is mounted on the side guard plate 14 and the sealing plate 9 via bearings 2 and bearing seats 1 on both sides. Tool shaft protective rings 8 are installed at both ends of the spindle welding assembly 3. The tool shaft protective rings 8 are detachably connected to the guard assembly 13 and are located inside the side guard plate 14. In this embodiment, all detachable connections are made using bolts.

[0038] The specific implementation process is as follows: During use, the grass enters the cover assembly 13 from the lower part of the movable cover 11 and is pressed down by the movable cover 11. The rotation of the central shaft of the cutter drives the blade mounting shaft 4 to move through the blade spacer sleeve 5, and the swivel blade 7 swings freely. The swivel blade 7 cuts the grass that has entered the cover assembly 13, completing the grass cutting operation.

[0039] The above descriptions are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A working tool, comprising a protective cover assembly and a cutting tool installed within the protective cover assembly, the protective cover assembly including side guards located on both sides of the cutting tool and a top guard covering the top of the cutting tool, the cutting tool being horizontally disposed within the protective cover assembly; characterized in that: The inlet end of the protective cover assembly is provided with a movable protective cover. The movable protective cover is movably connected to the protective cover assembly and its range of motion is adjustable, so that when the grass passes through the movable protective cover, the degree to which the movable protective cover presses the grass can be adjusted, and the binding force on the grass can be varied. A first limiting device is provided between the movable cover and the cover assembly to limit the range of motion of the movable cover; The first limiting device includes a limiting hole and a limiting pin that can be inserted into the limiting hole. The limiting hole is located on the protective cover assembly and / or the movable protective cover. The limiting holes can be distributed around the hinge point axis of the movable protective cover with the same radius.

2. The working implement according to claim 1, characterized in that: It also includes a second limiting device to restrict the downward swing tendency of the movable shield under the action of gravity.

3. The working implement according to claim 2, characterized in that: The second limiting device is a protrusion, support point, or deformable part on the movable cover that abuts against the cover assembly.

4. The working implement according to claim 1 or 3, characterized in that: An inner protective plate is detachably installed on the inside of the protective cover assembly.

5. The working implement according to claim 4, characterized in that: The cutting tool includes a spindle welding assembly, a blade mounting shaft, a swivel blade, and a limiting component. The spindle welding assembly has a plurality of blade mounting shafts evenly distributed around its axis of rotation. Multiple sets of swivel blades are loosely fitted on the blade mounting shafts. The limiting component restricts the blade mounting shafts from moving axially along the spindle welding assembly.

6. The working implement according to claim 5, characterized in that: The spindle welding assembly includes a central shaft and a mounting plate. The mounting plate has several mounting positions evenly distributed around the axis of the central shaft in the circumferential direction. The blade mounting shaft passes through the corresponding mounting position on the mounting plate. The spindle welding assembly is also provided with a blade spacer sleeve. The blade mounting shaft also passes through the inside of the spacer sleeve. Several of the swivel blades are arranged in the circumferential direction of the spindle welding assembly through the blade spacer sleeve.

7. The working implement according to claim 6, characterized in that: A primary symmetry plane is provided on the spindle welding assembly. The same number of secondary symmetry planes are symmetrically arranged on each blade mounting axis, with the same number of secondary symmetry planes on each blade mounting axis. The same number and type of swivel blades are provided on the secondary symmetry planes symmetrically arranged about the primary symmetry plane, and the theoretical center of gravity of the corresponding swivel blades is concentrated on the corresponding secondary plane. The types of blades and the total number of each type of swivel blade are the same on each blade mounting axis. With the main symmetry plane as the boundary, the swivel blades on either side are evenly distributed along the axis of the main spindle welding assembly. The axial projection interval of two adjacent sets of swivel blades is the same, and the axial projection interval of the swivel blades on both sides of the main symmetry plane is consistent with the axial projection interval of the swivel blades on the other side.

8. The working implement according to claim 7, characterized in that: The swivel blade includes a sharpened blade portion and an unsharpened handle portion. The handle portion is loosely fitted onto the blade mounting shaft, and when the swivel blade swings freely, the handle portion contacts the central shaft.

9. The working implement according to any one of claims 5-8, characterized in that: The side guard plate of the protective cover assembly has a notch, and the main spindle welding assembly is set inside the protective cover assembly through the notch. The notch is detachably connected to a sealing plate. The two sides of the main spindle welding assembly are mounted on the side guard plate and the sealing plate through bearings and bearing seats. The two ends of the main spindle welding assembly are equipped with cutter shaft protective rings. The cutter shaft protective rings are detachably connected to the protective cover assembly and are set inside the side guard plate.

Images