Protective device for cutting knife of mowing machine

Abstract

The invention discloses a mowing machine cutting knife protection device which comprises a mounting box, a cutterhead seat mechanism, a cutterhead mechanism and a protection plate mechanism, a plurality of mounting positions are arranged in the mounting box and used for mounting the cutterhead seat mechanism, the cutterhead seat mechanism is used for mounting the cutterhead mechanism, the protection plate mechanism is mounted below the mounting positions, and a protection plate comprises a lower protection plate body and an upper protection plate body. The lower protection plate comprises a first section, a second section and a third section, the two ends of the second section are connected with one end of the first section and one end of the third section respectively, the other end of the first section and the other end of the third section incline towards the installation box, and preset included angles are formed between the first section and the second section and between the second section and the third section and are obtuse angles. One end of the upper protection plate is fixedly connected with the other end of the third section of the lower protection plate, the other end of the upper protection plate is fixedly connected with the installation box, the other end of the lower protection plate is fixedly connected with the installation box through a connecting piece, and a gap exists between the upper end face of the lower protection plate and the lower end face of the installation box.

Description

Technical Field

[0001] The invention relates to a cutting blade protection device for a lawn mower. Background Art

[0002] The rotary mower is an important member of the lawn mower family. It has attracted much attention for its unique working method and wide range of applications. This type of machine is mainly suitable for vast grasslands, dense shrubbery and pastures with uneven surfaces. In grasslands and shrubbery, the rotary mower can efficiently cut weeds and shrubs to keep the ground clean and orderly. At the same time, for pastures with uneven surfaces, the rotary mower can also play its powerful role to help ranchers update and renovate pastures. Rotary mowers are widely used in various lawn maintenance scenarios due to their efficient and fast mowing capabilities.

[0003] However, the speed of the cutter blade of this type of mower is generally relatively high, which improves the mowing efficiency but also brings potential safety hazards during the operation. In order to ensure the safety of the operator, the safety protection of the cutter blade is particularly important. Summary of the invention

[0004] The purpose of the present invention is to solve the above deficiencies in the prior art and provide a lawn mower blade protection device.

[0005] A mower blade protection device comprises a mounting box, a blade seat mechanism, a blade mechanism, and a protection plate mechanism. The mounting box is provided with a plurality of mounting positions, the mounting positions are used to be mounted on the blade seat mechanism, the blade seat mechanism is used to mount the blade mechanism, the protection plate mechanism is mounted below the mounting positions, and the protection plate comprises a lower protection plate and an upper protection plate.

[0006] The lower guard plate includes a first section, a second section, and a third section. The two ends of the second section are respectively connected to one end of the first section and the third section. The other end of the first section and the other end of the third section are both inclined toward the installation box. A predetermined angle is provided between the first section and the second section, and between the second section and the third section. The angle is an obtuse angle. One end of the upper guard plate is fixedly connected to the other end of the third section of the lower guard plate, and the other end of the upper guard plate is fixedly connected to the installation box. The other end of the lower guard plate is fixedly connected to the installation box through a connecting piece. There is a gap between the upper end surface of the lower guard plate and the lower end surface of the installation box.

[0007] Furthermore, the third section of the lower guard plate is a trapezoidal structure, and upward flanges are provided at the waist positions on both sides.

[0008] Furthermore, the upper guard plate and the lower guard plate are fixedly connected by welding, and the other end of the lower guard plate and the other end of the upper guard plate are connected to the installation box by bolts.

[0009] Furthermore, the installation box comprises a box body and a box cover, and a plurality of connection holes are provided along the edges of the box body and the box cover, and the connection holes are used for passing bolts.

[0010] Furthermore, the connecting part is a "Z"-shaped bending plate, and the bending plate includes an upper section, a middle section, and a lower section connected in sequence. The upper section is connected to the installation box by bolts, and the bolts pass through the box cover, the box body, the upper section of the bending plate, and the nut at one time, and the lower section is connected to the first section of the lower guard plate by bolts.

[0011] Furthermore, the cutter disc seat mechanism includes a driving gear, a first connecting shaft is provided at the center of the driving gear, at least one bearing and a connecting plate are provided on the outside of the first connecting shaft, a bearing seat is provided on the outside of the bearing, the inner side surface of the bearing is connected to the outer side surface of the first connecting shaft, the outer side surface of the bearing is connected to the inner side surface of the bearing seat, the connecting plate is located above the bearing, the connecting plate is spline-connected to the first connecting shaft, the connecting plate is used to install the cutter disc mechanism, and a locking nut is provided on the top of the first connecting shaft.

[0012] Furthermore, there are two bearings, a spacer is provided between the two bearings, a skeleton sealing ring is provided between the outer side surface of the spacer and the inner side surface of the bearing seat, and an O-ring is provided between the inner side surface of the spacer and the outer side surface of the first connecting shaft.

[0013] Furthermore, the knife disc mechanism includes a knife holder plate, a knife disc, and a cutting knife. The knife disc includes a left section, a middle section, and a right section. The left section and the right section are respectively connected to one end of the knife holder plate. A short shaft is provided above the other end of the knife holder plate. A special-shaped through hole is provided on the surface of the other end of the cutting knife. The width of the through hole is larger than the axial diameter of the short shaft. The cutting knife sleeve is arranged on the outside of the short shaft. The cutting knife is located between the cutting disc and the knife holder plate. The knife holder plate and the knife disc are fixedly connected by multiple bolts. The bolts pass through the knife disc, the knife holder plate, and the connecting plate at one time.

[0014] Furthermore, blades are provided on both sides of the cutting knife.

[0015] Furthermore, a top cover is provided above the middle section of the cutter disc, and connection holes are provided on the edges around the top cover. A corresponding connection hole is provided in the middle section of the cutter disc, and the top cover is fixedly connected by bolts passing through the connection holes of the top cover and the cutter disc. The top cover is a thin plate stretched and pressed, and a concave clearance groove is provided below it.

[0016] Beneficial effects: Compared with the existing technology, the present invention has the following advantages:

[0017] Stable and flexible structure: The device ensures the stability of each component through multiple connections and fixing methods (such as bolt connection, welding, etc.). At the same time, the unique three-section design of the lower guard plate and the inclined and obtuse angle design between it and the installation box not only increase the stability of the structure, but also provide sufficient flexibility to adapt to the needs of different working environments.

[0018] Excellent protection performance: The design of the lower guard plate and the upper guard plate forms a complete protection system, which can effectively prevent the splashing debris or external objects from damaging the internal parts of the mower during mowing, and also protect the operator from accidental injury. In particular, the trapezoidal structure and flange design of the lower guard plate further enhance the protection effect.

[0019] Easy maintenance and replacement: The connection method between the components (such as bolt connection) makes it easier to repair or replace the device when parts need to be replaced. For example, when the cutter is worn and needs to be replaced, just loosen the bolts to easily remove the cutter for replacement.

[0020] Good sealing performance: The skeleton seal ring and O-ring design between the bearing seat and the bearing effectively prevent the leakage of substances such as lubricating oil or water, ensuring the normal operation and long service life of the internal components of the device.

[0021] The cutting knife has a long service life: the flexible connection between the cutting knife and the knife holder plate (realized by special-shaped through holes and short shafts) and the design that the cutting knife can be turned over for use enable the cutting knife to automatically avoid hard objects when encountering them, thus reducing the wear of the cutting knife and extending the service life of the cutting knife.

[0022] Reasonable top cover design: The top cover is made of thin plate stretched and pressed, which not only reduces weight but also reduces cost. At the same time, the design of the groove on the top cover can reduce the friction and collision with surrounding objects during operation, further improving the stability and durability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The invention is an overall cross-sectional view of a lawn mower blade guard;

[0024] Figure 2 It is a schematic diagram of the cutter disc mechanism;

[0025] Figure 3 It is the motion diagram of the cutter disc mechanism;

[0026] Figure 4 It is a schematic diagram of a cutting knife;

[0027] Figure 5 is a schematic diagram of the tool holder plate;

[0028] Figure 6 is a top view of the guard plate mechanism;

[0029] Figure 7 It is a cross-sectional view of the internal structure of the cutter head seat mechanism;

[0030] In the figure, 1, top cover, 2, cutter disc, 3, cutter holder plate, 4, short shaft, 5, cutting knife, 6, box cover, 7, connecting piece, 8, box body, 9, lower guard plate, 10, cutter disc seat mechanism, 11, upper guard plate, 12, special-shaped through hole, 13, driving gear, 14, bearing, 15, spacer, 16, O-ring, 17, skeleton sealing ring, 18, bearing seat, 19, connecting plate. DETAILED DESCRIPTION

[0031] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0032] like Figure 1-7 As shown, top cover 1, cutter disc 2, cutter frame plate 3, short shaft 4, cutter 5, box cover 6, connecting piece 7, box body 8, lower guard plate 9, cutter disc seat mechanism 10, upper guard plate 11, special-shaped through hole 12, driving gear 13, bearing 14, spacer 15, O-ring 16, skeleton sealing ring 17, bearing seat 18, connecting plate 19;

[0033] A mower blade protection device comprises an installation box, a blade seat mechanism 10, a blade 2 mechanism, and a protection plate mechanism. The installation box is provided with a plurality of installation positions, the installation positions are used to be installed on the blade seat mechanism 10, the blade seat mechanism 10 is used to install the blade 2 mechanism, the protection plate mechanism is installed below the installation positions, and the protection plate comprises a lower protection plate 9 and an upper protection plate 11.

[0034] The lower guard plate 9 includes a first section, a second section, and a third section. The two ends of the second section are respectively connected to one end of the first section and the third section. The other end of the first section and the other end of the third section are both inclined toward the installation box. A predetermined angle is provided between the first section and the second section, and between the second section and the third section. The angle is an obtuse angle. One end of the upper guard plate 11 is fixedly connected to the other end of the third section of the lower guard plate 9, and the other end of the upper guard plate 11 is fixedly connected to the installation box. The other end of the lower guard plate 9 is fixedly connected to the installation box through a connecting member 7. There is a gap between the upper end surface of the lower guard plate 9 and the lower end surface of the installation box.

[0035] In this example, the third section of the lower guard plate 9 is a trapezoidal structure, and upward flanges are provided at the waist positions on both sides.

[0036] In this example, the upper guard plate 11 and the lower guard plate 9 are fixedly connected by welding, and the other end of the lower guard plate 9 and the other end of the upper guard plate 11 are connected to the installation box by bolts.

[0037] In this example, the installation box includes a box body 8 and a box cover 6. The box body 8 and the box cover 6 are provided with a plurality of connection holes along the edges, and the connection holes are used for passing bolts.

[0038] In this example, the connecting member 7 is a "Z"-shaped bending plate, which includes an upper section, a middle section, and a lower section connected in sequence. The upper section is connected to the installation box by bolts, and the bolts pass through the box cover 6, the box body 8, the upper section of the bending plate, and the nut at one time. The lower section is connected to the first section of the lower guard plate 9 by bolts.

[0039] In this example, the cutter disc seat mechanism 10 includes a driving gear 13, a first connecting shaft is provided at the center of the driving gear 13, at least one bearing 14 and a connecting plate 19 are provided on the outside of the first connecting shaft, a bearing seat 18 is provided on the outside of the bearing 14, the inner side surface of the bearing 14 is connected to the outer side surface of the first connecting shaft, the outer side surface of the bearing 14 is connected to the inner side surface of the bearing seat 18, the connecting plate 19 is located above the bearing 14, the connecting plate 19 is spline-connected to the first connecting shaft, the connecting plate 19 is used to install the cutter disc 2 mechanism, and a locking nut is provided on the top of the first connecting shaft.

[0040] In this example, there are two bearings 14, a spacer sleeve 15 is provided between the two bearings 14, a skeleton sealing ring 17 is provided between the outer side surface of the spacer sleeve 15 and the inner side surface of the bearing seat 18, and an O-ring 16 is provided between the inner side surface of the spacer sleeve 15 and the outer side surface of the first connecting shaft.

[0041] In the present example, the knife disc 2 mechanism comprises a knife holder plate 3, a knife disc 2 and a cutting knife 5. The knife disc 2 comprises a left section, a middle section and a right section. The left section and the right section are respectively connected to one end of the knife holder plate 3. A short shaft 4 is provided above the other end of the knife holder plate 3. A special-shaped through hole 12 is provided on the surface of the other end of the cutting knife 5. The width of the through hole is greater than the axial diameter of the short shaft 4. The cutting knife 5 is sleeved on the outside of the short shaft 4. The cutting knife 5 is located between the cutting disc and the knife holder plate 3. The knife holder plate 3 and the knife disc 2 are fixedly connected by multiple bolts. The bolts pass through the knife disc 2, the knife holder plate 3 and the connecting plate 19 at one time.

[0042] It should be noted that in the present structure, the cooperation between the cutter 5 and the short shaft 4 is flexible, and the cutter 5 can rotate around the short shaft 4. During normal operation, the cutter 5 disk 2 rotates at high speed, driving the cutter 5 to rotate together (the cutter 5 is thrown out to cut the grass) to cut the grass. When encountering hard objects, because the cutter 5 is flexibly connected and the aperture of the cutter 5 is larger than the diameter of the short shaft 4, the cutter 5 rotates backward to avoid the hard objects, thereby extending the service life of the cutter 5.

[0043] In this example, the cutting knife 5 is provided with cutting edges on both sides.

[0044] In this example, a top cover 1 is provided above the middle section of the cutter disc 2, and connection holes are provided on the edges of the top cover 1. A corresponding connection hole is provided in the middle section of the cutter disc 2. The top cover 1 is fixedly connected by bolts passing through the connection holes of the top cover 1 and the cutter disc 2. The top cover 1 is a thin plate stretched and pressed, and a concave clearance groove is provided below it.

[0045] Instructions for use: This mower blade protection device integrates key components such as the blade, blade disc, top cover, locking nut, blade disc gear, connecting plate, skeleton oil seal, bearing seat, protective plate, connecting plate, and box assembly. The two sides of the blade are provided with tough edges for easy flipping, and the opening adopts a flexible non-circular hole design to protect the blade from damage by hard objects; the blade disc is flexibly connected to the blade to ensure that the blade can rotate backward to avoid hard objects; the top cover is made of thin plate stretched and pressed to prevent dust and dirt; the connecting plate is made of bent steel plate to connect the box and the protective plate; the blade disc gear matches the connecting plate and the transition gear in the box to form a power transmission system; the upper folding plate of the protective plate enhances the strength and effectively prevents the box from rubbing; the box assembly is responsible for the power transmission of the blade disc. The overall design not only ensures the efficiency of mowing, but also improves durability and safety.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A lawn mower blade protection device, characterized in that: It includes an installation box, a cutter seat mechanism, a cutter mechanism, and a protective plate mechanism. The installation box is provided with a plurality of installation positions. The installation positions are used to be installed on the cutter seat mechanism. The cutter seat mechanism is used to install the cutter mechanism. The protective plate mechanism is installed below the installation positions. The protective plate includes a lower protective plate and an upper protective plate. The lower guard plate includes a first section, a second section, and a third section. The two ends of the second section are respectively connected to one end of the first section and the third section. The other end of the first section and the other end of the third section are both inclined toward the installation box. A predetermined angle is provided between the first section and the second section, and between the second section and the third section. The angle is an obtuse angle. One end of the upper guard plate is fixedly connected to the other end of the third section of the lower guard plate, and the other end of the upper guard plate is fixedly connected to the installation box. The other end of the lower guard plate is fixedly connected to the installation box through a connecting piece. There is a gap between the upper end surface of the lower guard plate and the lower end surface of the installation box.

2. A lawn mower blade guard according to claim 1, characterized in that: The third section of the lower guard plate is a trapezoidal structure, and upward flanges are provided at the waist positions on both sides.

3. A lawn mower blade guard according to claim 1, characterized in that: The upper guard plate and the lower guard plate are fixedly connected by welding, and the other end of the lower guard plate and the other end of the upper guard plate are connected to the installation box by bolts.

4. A lawn mower blade guard according to claim 1, characterized in that: The installation box comprises a box body and a box cover. A plurality of connection holes are arranged along the edges of the box body and the box cover, and the connection holes are used for passing bolts.

5. A lawn mower blade guard according to claim 4, characterized in that: The connecting piece is a "Z"-shaped bending plate, which includes an upper section, a middle section, and a lower section connected in sequence. The upper section is connected to the installation box by bolts, and the bolts pass through the box cover, the box body, the upper section of the bending plate, and the nut at one time. The lower section is connected to the first section of the lower guard plate by bolts.

6. A lawn mower blade guard according to claim 1, characterized in that: The cutter disc seat mechanism includes a driving gear, a first connecting shaft is provided at the center of the driving gear, at least one bearing and a connecting plate are provided on the outside of the first connecting shaft, a bearing seat is provided on the outside of the bearing, the inner side surface of the bearing is connected to the outer side surface of the first connecting shaft, the outer side surface of the bearing is connected to the inner side surface of the bearing seat, the connecting plate is located above the bearing, the connecting plate is spline-connected to the first connecting shaft, the connecting plate is used to install the cutter disc mechanism, and a locking nut is provided on the top of the first connecting shaft.

7. A lawn mower blade guard according to claim 6, characterized in that: There are two bearings, a spacer is arranged between the two bearings, a skeleton sealing ring is arranged between the outer side of the spacer and the inner side of the bearing seat, and an O-type sealing ring is arranged between the inner side of the spacer and the outer side of the first connecting shaft.

8. The lawn mower blade guard device according to claim 6, characterized in that: The knife disc mechanism includes a knife holder plate, a knife disc and a cutting knife. The knife disc includes a left section, a middle section and a right section. The left section and the right section are respectively connected to one end of the knife holder plate. A short shaft is provided above the other end of the knife holder plate. A special-shaped through hole is provided on the surface of the other end of the cutting knife. The width of the through hole is larger than the axial diameter of the short shaft. The cutting knife sleeve is arranged on the outside of the short shaft. The cutting knife is located between the cutting disc and the knife holder plate. The knife holder plate and the knife disc are fixedly connected by multiple bolts. The bolts pass through the knife disc, the knife holder plate and the connecting plate at one time.

9. A lawn mower blade guard according to claim 8, characterized in that: The cutting knife is provided with cutting edges on both sides.

10. The lawn mower blade guard device according to claim 8, characterized in that: A top cover is provided above the middle section of the cutter disc, and connection holes are provided on the edges of the top cover. A corresponding connection hole is provided in the middle section of the cutter disc, and the top cover is fixedly connected by bolts passing through the connection holes of the top cover and the cutter disc. The top cover is a thin plate stretched and pressed, and a concave give way groove is provided below it.

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