Height adjusting mechanism and mower

Abstract

The utility model provides a height adjusting mechanism and a mower, the height adjusting mechanism comprises a lifting assembly, the lifting assembly comprises a fixed base, two parallel rod assemblies and a connecting assembly, one end of each parallel rod assembly is hinged to the fixed base, the connecting assembly is connected with the two parallel rod assemblies, and one of the parallel rod assemblies is provided with a limiting protrusion; the lifting driving assembly comprises a lifting driving part, a cam shaft connected with the lifting driving part and a first cam surface which surrounds the periphery of the cam shaft and is a spiral surface; the cam shaft is rotatably arranged on the fixed base; the lifting driving part drives the cam shaft to rotate, the limiting protrusion slides relative to the spiral faces with different heights on the first cam face, the two parallel rod assemblies are driven to rotate up and down along the hinged positions of the parallel rod assemblies and the fixed base along with fluctuation of the spiral faces and ascending or descending of the limiting protrusion, and mowing height adjustment is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of lawn mowers, in particular to a height adjustment mechanism and a lawn mower. Background Art

[0002] A lawn mower, also known as a lawn mower, lawn trimmer, lawn trimmer, etc., is a machine specifically used for mowing lawns, vegetation, etc.

[0003] The lawn mower automatically walks on the grass and mows the grass. In order to meet the different requirements of users for mowing height, the lawn mower usually has a height adjustment device to adjust the cutting height. Existing lawn mowers usually use mechanical or electronic methods to achieve this, such as rotating the height adjustment lever, adjusting the connecting rod bracket, or using an electric push rod. This adjustment method is often limited by the size and installation position of the mechanical components, resulting in a narrow range of adjustment for the mowing height, which cannot fully meet the diverse needs of users for mowing height, resulting in the lawn being mowed too short or too long, affecting the overall aesthetics and growth of the lawn. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a height adjustment mechanism and a lawn mower, so as to solve the technical problem of the narrow height adjustment range of the lawn mower in the prior art.

[0005] In order to achieve the above object, the utility model provides a height adjustment mechanism, comprising:

[0006] A lifting assembly, the lifting assembly comprising a fixed base, two parallel rod assemblies hinged at one end to the fixed base, and a connecting assembly connecting the two parallel rod assemblies, wherein a limiting protrusion is provided on one of the parallel rod assemblies;

[0007] A lifting drive assembly, the lifting drive assembly comprising a lifting drive member, a cam shaft connected to the lifting drive member, and a first cam surface in a spiral surface arranged around the cam shaft; the cam shaft is rotatably arranged on the fixed base;

[0008] The lifting drive member drives the camshaft to rotate and drives the first cam surface to rotate. As the first cam surface rotates, relative sliding occurs between the limiting protrusion and the spiral surfaces of different heights on the first cam surface. As the spiral surfaces rise and fall, the limiting protrusion rises or falls, thereby driving the two parallel rod assemblies to rotate up and down respectively along the hinges with the fixed base.

[0009] As a more preferred embodiment, the parallel rod assembly includes a support rod and a top rod and a bottom rod arranged parallel to each other; a fixed rod is vertically arranged on the fixed base; one end of the top rod and the bottom rod are respectively hinged to the top and bottom ends of the fixed rod, and the other ends are respectively hinged to the two ends of the support rod, and the limiting protrusion is arranged on one of the top rods.

[0010] As a more preferred embodiment, a limiting protrusion is also provided on the other push rod, and the lifting drive assembly also includes a second cam surface which is spirally arranged around the camshaft, and the limiting protrusion on the other push rod can slide relative to the second cam surface.

[0011] As a more preferred embodiment, a long strip slide groove is provided on the first cam surface, and the limiting protrusion can slide along the long strip slide groove along with the ups and downs of the spiral surface.

[0012] As a more preferred embodiment, the lifting drive assembly also includes a first connecting sleeve, and the lifting drive member is connected to the first connecting sleeve by interference fit; a plurality of keys are axially arranged on the outer side of the camshaft; a keyway matching the key on the outer side of the camshaft is arranged in the first connecting sleeve, and the shape, size and distribution position of the keyway correspond one-to-one with the key on the camshaft, and the key is embedded in the keyway, so that a clearance or transition fit is achieved between the camshaft and the first connecting sleeve through a multi-tooth connection.

[0013] As a more preferred embodiment, the connecting assembly includes a first crossbeam and a second crossbeam, the top rods of the two parallel rod assemblies are connected by the first crossbeam, the bottom rods of the two parallel rod assemblies are connected by the second crossbeam, an extension portion is provided on the side of the top rod, the limiting protrusion is provided on the extension portion, and the length of the extension portion does not exceed one third of the length of the crossbeam.

[0014] As a more preferred embodiment, the lifting assembly further comprises a protruding shaft vertically arranged on the fixed base, and the cam shaft is rotatably sleeved on the protruding shaft.

[0015] As a more preferred embodiment, the lifting drive member includes a drive member and a worm gear structure connected to the drive member, and the worm gear structure is connected to the camshaft.

[0016] As a more preferred embodiment, the lifting assembly further comprises a spring, one end of the spring is connected to the top rod, and the other end of the spring is connected to the bottom rod, and when the two parallel rod assemblies rotate up and down, the spring is always in a stretched state.

[0017] To achieve the above object, the utility model also provides a lawn mower, comprising:

[0018] A height adjustment mechanism as described above;

[0019] A cutting assembly, the cutting assembly comprising a blade, a blade driving member and a support cylinder for accommodating the blade driving member; the other ends of the two parallel rod assemblies are hinged to the two sides of the support cylinder; the output shaft of the blade driving member extends out of the support cylinder and is connected to the blade;

[0020] A fixed shell is provided with a chamber for accommodating the height adjustment mechanism; the cutting assembly is arranged on the fixed shell; when the two parallel rod assemblies rotate up and down along the hinges with the fixed base respectively, the blade is driven to move up and down through the support tube.

[0021] As described above, the height adjustment mechanism and lawn mower of the utility model have the following beneficial effects:

[0022] When the height adjustment mechanism of the utility model is working, the lifting drive member drives the camshaft to rotate, and drives the first cam surface to rotate. As the first cam surface rotates, relative sliding occurs between the limiting protrusion and the spiral surfaces of different heights on the first cam surface. As the spiral surfaces rise and fall, the limiting protrusion rises or falls, thereby driving the two parallel rod assemblies to rotate up and down respectively along the hinges with the fixed base, thereby realizing height adjustment. At the same time, when the height adjustment mechanism encounters an obstacle, the two parallel rod assemblies can rotate upward under the action of external force, thereby realizing the floatability of the height adjustment mechanism, which can be applied in different scenarios, with high stability and strong flexibility.

[0023] When the lawn mower of the utility model is working, the camshaft is driven to rotate by the lifting drive member, so that the first cam surface can be driven to rotate. With the rotation of the first cam surface, relative sliding occurs between the limiting protrusion and the spiral surface of different heights on the first cam surface. With the ups and downs of the spiral surface, the limiting protrusion rises or falls, thereby driving the two parallel rod assemblies to rotate up and down along the hinges with the fixed base respectively, and the blade is driven up and down by the support tube. The blade driving member drives the blade to rotate to cut grass, thereby realizing the adjustment of the cutting height. When the lawn mower encounters obstacles or high dense grass during driving, the two parallel rod assemblies will be lifted by the upward force to increase the distance between the cutting assembly and the working surface. Even if the cutting assembly is at a lower cutting height, the floating effect of the cutting assembly can ensure that the lawn mower has good passability. The height adjustment mechanism of the present application can ensure the floating property of the cutting assembly while realizing the adjustment of the cutting height, so that the lawn mower can better adapt to various terrains and lawn conditions, improve the adaptability and flexibility of the lawn mower, and increase the overall beauty and growth condition of the lawn. Furthermore, height adjustment is achieved through limited structures such as the camshaft, the limit protrusion, and the first cam surface. The structure is simple, the cost and failure rate are reduced, and it helps to maintain the stability of the lawn mower during operation. The stable mowing height and cutting action can reduce the vibration and noise of the machine, and improve the operating efficiency and service life.

[0024] The height adjustment mechanism and lawn mower of the utility model realize height adjustment through limited structures such as a camshaft, a limit protrusion, and a first cam surface. The structure is simple, and the cost and failure rate are reduced, which helps to maintain the stability of the lawn mower during operation. The stable mowing height and cutting action can reduce the vibration and noise of the machine, and improve the operating efficiency and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Shown is an exploded schematic diagram of the height adjustment mechanism of the present invention.

[0026] Figure 2 Shown is a structural schematic diagram of the height adjustment mechanism of the utility model.

[0027] Figure 3 Shown is a structural schematic diagram of the height adjustment mechanism of the utility model from another angle.

[0028] Figure 4 Shown is a bottom view of the lawn mower of the present invention.

[0029] Component number description

[0030] 1 Fixed base

[0031] 2 Limiting protrusion

[0032] 3 Fixing rod

[0033] 4 Support rods

[0034] 5. Ejector

[0035] 501 Extension

[0036] 6 Bottom bar

[0037] 7 Lifting drive

[0038] 701 Drive parts

[0039] 702 Worm gear structure

[0040] 8 Camshaft

[0041] 9 First cam surface

[0042] 10 Second cam surface

[0043] 11 First connection set

[0044] 12 First beam

[0045] 13 Second beam

[0046] 14 Second connection set

[0047] 15 Protruding shaft

[0048] 16 Spring

[0049] 17 Blade

[0050] 18 Blade drive

[0051] 19 Support tube

[0052] 20 Fixed housing

[0053] 21. Blade

[0054] 22 Mowing Fender DETAILED DESCRIPTION

[0055] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0056] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions that can be implemented in this utility model, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that can be produced by the utility model and the purposes that can be achieved, should still fall within the scope of the technical content disclosed by the utility model. The following detailed description should not be considered restrictive, and the scope of the embodiments of this application is limited only by the claims of the published patents. The terms used here are only for describing specific embodiments and are not intended to limit this application. Spatial related terms, such as "upper", "lower", "left", "right", "below", "below", "lower", "above", "upper", etc., can be used in the text to facilitate the description of the relationship between an element or feature shown in the figure and another element or feature.

[0057] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix", "hold" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] Furthermore, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless there is an indication to the contrary in the context. It should be further understood that the terms "comprise", "include" indicate the presence of the described features, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence or addition of one or more other features, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Exceptions to this definition will only occur when the combination of elements, functions or operations is inherently mutually exclusive in some way.

[0059] In order to make the purpose, technical solution and advantages of the utility model more clear, the technical solution in the embodiment of the utility model is further described in detail through the following embodiments and the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0060] like Figure 1-4 As shown, the utility model provides a height adjustment mechanism, comprising:

[0061] A lifting assembly, the lifting assembly comprising a fixed base 1, two parallel rod assemblies hinged at one end to the fixed base 1, and a connecting assembly connecting the two parallel rod assemblies, wherein a limiting protrusion 2 is provided on one of the parallel rod assemblies;

[0062] A lifting drive assembly, the lifting drive assembly comprising a lifting drive member 7, a cam shaft 8 connected to the lifting drive member 7, and a first cam surface 9 arranged around the cam shaft 8 in a spiral surface; the cam shaft 8 is rotatably arranged on the fixed base 1;

[0063] The lifting drive member 7 drives the camshaft 8 to rotate, and drives the first cam surface 9 to rotate. As the first cam surface 9 rotates, relative sliding occurs between the limiting protrusion 2 and the spiral surfaces of different heights on the first cam surface 9. As the spiral surfaces rise and fall, the limiting protrusion 2 rises or falls, thereby driving the two parallel rod assemblies to rotate up and down along the hinges with the fixed base 1 respectively.

[0064] In order to better introduce the height adjustment mechanism of the utility model, it is now explained in combination with the following specific applications: when the height adjustment mechanism of the utility model is working, the lifting drive member 7 drives the camshaft 8 to rotate, and drives the first cam surface 9 to rotate. As the first cam surface 9 rotates, relative sliding occurs between the limiting protrusion 2 and the spiral surfaces of different heights on the first cam surface 9. As the spiral surfaces rise and fall, the limiting protrusion 2 rises or falls, thereby driving the two parallel rod assemblies to rotate up and down respectively along the hinges with the fixed base 1, thereby realizing height adjustment; at the same time, when the height adjustment mechanism encounters an obstacle, under the action of external force, the two parallel rod assemblies can rotate upward, thereby realizing the floatability of the height adjustment mechanism, which can be applied in different scenarios, with high stability and strong flexibility.

[0065] In this embodiment, if Figure 1-3As shown, the parallel rod assembly includes a support rod 4 and a top rod 5 and a bottom rod 6 arranged in parallel with each other; a fixed rod 3 is vertically arranged on the fixed base 1; one end of the top rod 5 and the bottom rod 6 are respectively hinged to the top and bottom ends of the fixed rod 3, and the other end is respectively hinged to the two ends of the support rod 4, and the limiting protrusion 2 is arranged on one of the top rods 5. In this way, the limiting protrusion 2 is arranged on one of the top rods 5, and when the lifting drive member 7 drives the cam shaft 8 to rotate, the limiting protrusion 2 contacts the first cam surface 9 and slides along the spiral surface of different heights on the first cam surface 9, driving the parallel rod assembly provided with the limiting protrusion 2 to rotate, and through the connecting assembly, driving the other parallel rod assembly to rotate at the same time, so as to maintain the stability of the overall structure during the height adjustment process. Furthermore, since the limiting protrusion 2 is arranged on the top rod 5, the position where the limiting protrusion 2 abuts against the first cam surface 9 is on the side of the parallel rod assembly, which can increase the height adjustment range of the height adjustment mechanism.

[0066] In this embodiment, if Figure 1-3 As shown, the other push rod 5 is also provided with a limiting protrusion 2, and the lifting drive assembly further includes a second cam surface 10 which is arranged around the cam shaft 8 and is a spiral surface, and the limiting protrusion 2 on the other push rod 5 can slide relative to the second cam surface 10. The first cam surface 9 and the second cam surface 10 are arranged at intervals, so that the lifting drive member 7 drives the cam shaft 8 to rotate, and at the same time drives the first cam surface 9 and the second cam surface 10 to rotate. With the rotation of the first cam surface 9 and the second cam surface 10, the limiting protrusions 2 on the two push rods 5 slide relative to each other with the spiral surfaces of different heights on the first cam surface 9 and the second cam surface 10, and with the ups and downs of the spiral surfaces, the limiting protrusions 2 on the two push rods 5 rise or fall, thereby driving the two push rods 5 to rotate up and down respectively along the hinge with the fixed rod 3, thereby driving the two parallel rod assemblies to rotate up and down at the same time, further improving the stability of the overall structure during the height adjustment process.

[0067] In this embodiment, the first cam surface 9 is provided with a long strip slide groove, and the limiting protrusion 2 can slide along the long strip slide groove along with the ups and downs of the spiral surface. The second cam surface 10 is also provided with a long strip slide groove, and when the lifting drive member 7 drives the cam shaft 8 to rotate, the limiting protrusions 2 on the two push rods 5 slide in the corresponding long strip slide grooves, which can ensure the accuracy of the limiting protrusions 2 sliding in the long strip slide grooves, and ensure the stability of the two parallel rod assemblies in the process of rotating up and down, so that the rotation angle and position of the two parallel rod assemblies are accurately controlled, thereby improving the working accuracy of the entire mechanism.

[0068] In this embodiment, the limiting protrusion 2 can also be set on the bottom rod 6, and a cam surface with a spiral surface can be correspondingly set around the cam shaft 8. The structure and principle are similar to those of the limiting protrusion 2 set on the top rod 5, and will not be repeated here.

[0069] In this embodiment, if Figure 1-3 As shown, the lifting drive assembly also includes a first connecting sleeve 11, and the lifting drive member 7 is connected to the first connecting sleeve 11 through an interference fit; a plurality of keys are axially arranged on the outer side of the camshaft 8; a keyway matching the key on the outer side of the camshaft 8 is arranged in the first connecting sleeve 11, and the shape, size and distribution position of the keyway correspond to the key on the camshaft 8 one by one, and the key is embedded in the keyway, so that the camshaft 8 and the first connecting sleeve 11 are connected through multiple teeth to achieve a gap or transition fit. In this way, installation is convenient, the stability of the connection is increased, loosening due to impact or vibration is prevented, the efficiency of power transmission is improved, and the stable rotation of the camshaft 8 relative to the protruding shaft 15 is ensured.

[0070] In this embodiment, if Figure 1-3 As shown, the connecting assembly includes a first crossbeam 12 and a second crossbeam 13, the top rods 5 of the two parallel rod assemblies are connected via the first crossbeam 12, the bottom rods 6 of the two parallel rod assemblies are connected via the second crossbeam 13, an extension portion 501 is provided on the side of the top rod 5, the limiting protrusion 2 is provided on the extension portion 501, and the length of the extension portion 501 does not exceed one third of the length of the crossbeam.

[0071] In this embodiment, if Figure 1 As shown, the lifting assembly further includes a protruding shaft 15 vertically disposed on the fixed base 1, and the cam shaft 8 is rotatably sleeved on the protruding shaft 15. Figure 1-3 As shown, the lifting assembly also includes a second connecting sleeve 14, and the cam shaft 8 is rotatably mounted on the protruding shaft 15 through the second connecting sleeve 14. The first cam surface 9 and the second cam surface 10 with a spiral surface are arranged around the second connecting sleeve 14. Under the driving action of the lifting drive 7, the cam shaft 8 rotates relative to the protruding shaft 15, thereby driving the two parallel rod assemblies to rotate up and down.

[0072] In this embodiment, if Figure 1-3As shown, the lifting drive member 7 includes a drive member 701 and a worm gear structure 702 connected to the drive member 701, and the worm gear structure 702 is connected to the camshaft 8. The worm gear structure 702 includes a worm and a worm wheel, and the worm is connected to the drive member 701. The output shaft of the worm wheel is connected to the first connecting sleeve 11 through an interference fit, and the camshaft 8 and the first connecting sleeve 11 are connected by multiple teeth to achieve a gap or transition fit. The drive member 701 drives the camshaft 8 to rotate relative to the protruding shaft 15 through the worm gear structure 702. With the rotation of the first cam surface 9 and the second cam surface 10, the limiting protrusions 2 on the two push rods 5 slide relative to each other with the spiral surfaces of different heights on the first cam surface 9 and the second cam surface 10, and with the ups and downs of the spiral surfaces, the limiting protrusions 2 on the two push rods 5 rise or fall, thereby driving the two push rods 5 to rotate up and down respectively along the hinge with the fixed rod 3, and then driving the two parallel rod assemblies to rotate up and down at the same time, thereby achieving height adjustment. At the same time, due to the self-locking function of the worm gear structure 702, when the camshaft 8 is subjected to external force or vibration, the camshaft 8 cannot overcome the self-locking force of the worm gear structure 702 to move, ensuring that the camshaft 8 can only be driven to rotate by the driving force of the driving member 701, thereby improving the stability of the structure. Furthermore, the height adjustment mechanism of the utility model realizes the functions of height adjustment and self-locking through the camshaft 8, the limiting protrusion 2, the first cam surface 9 and the worm gear structure 702, etc., with a simple structure, and reduces costs and failure rates.

[0073] In this embodiment, the driving member 701 adopts a driving motor. Since the driving motor has the advantages of easy control, fast response and easy integration, the driving motor is adopted as the driving member, so that the rotation of the camshaft 8 can be controlled more flexibly and conveniently.

[0074] In this embodiment, the driving member 701 may also be a manual operating element, and the manual operating element includes a knob, which can synchronously link the worm of the worm gear structure 702 to rotate, thereby driving the camshaft 8 to rotate through the worm gear structure 702. The above-mentioned knob can be locked and arranged on the top of the body for user operation; because its specific structure is the prior art in this field, it will not be described in detail in this application.

[0075] In this embodiment, if Figure 3As shown, the lifting assembly also includes a spring 16, one end of which is connected to the top rod 5, and the other end of which is connected to the bottom rod 6. When the two parallel rod assemblies rotate up and down, the spring 16 is always in a stretched state. A spring 16 is arranged between the top rod 5 and the bottom rod 6 of the two parallel rod assemblies. With the ups and downs of the spiral surface, the spring 16 is always in a stretched state during the up and down rotation of the two parallel rod assemblies, so that the spring 16 provides an upward force for the up and down rotation of the two parallel rod assemblies, which helps to stabilize the position of the parallel rod assemblies. Especially in dynamic operation or external disturbance, this stability can prevent the assembly from accidentally sagging or deviating from the predetermined position due to gravity or other forces, thereby improving the reliability and durability of the entire height adjustment mechanism. During the rotation process, the stretched state of the spring 16 is actually storing energy. When needed (such as when the parallel rod assembly needs to be quickly reset or resist external force impact), the spring 16 can release this stored energy to provide additional power support for the parallel rod assembly. Since the spring 16 continuously provides supporting force during the rotation process, the direct contact and friction between the parallel rod assembly and other components will be reduced accordingly, which helps to reduce wear and extend component life, while also reducing noise caused by friction and improving the overall operating quality of the height adjustment mechanism.

[0076] In order to better solve the above problems, Figure 1-4 As shown, the utility model also provides a lawn mower, comprising:

[0077] A height adjustment mechanism as described above;

[0078] A cutting assembly, the cutting assembly comprises a blade 17, a blade drive 18 and a support tube 19 for accommodating the blade drive 18; the other ends of the two parallel rod assemblies are hinged to the two sides of the support tube 19; the output shaft of the blade drive 18 extends from the support tube 19 and is connected to the blade 17;

[0079] A fixed shell 20 is provided with a chamber for accommodating the height adjustment mechanism; the cutting assembly is arranged on the fixed shell 20; when the two parallel rod assemblies rotate up and down along the hinges with the fixed base 1 respectively, the blade 17 is driven to move up and down through the support tube 19.

[0080] In order to better introduce the lawn mower of the utility model, it is now explained in combination with the following specific applications: the lawn mower of the utility model adopts the above-mentioned height adjustment mechanism. When the lawn mower is working, the cam shaft 8 is driven to rotate by the lifting drive member 7, which can drive the first cam surface 9 to rotate. As the first cam surface 9 rotates, relative sliding occurs between the limiting protrusion 2 and the spiral surfaces of different heights on the first cam surface 9. As the spiral surface rises and falls, the limiting protrusion 2 rises or falls, thereby driving the two parallel rod assemblies to rotate up and down respectively along the hinges with the fixed base 1, and the blade 17 is driven up and down by the support tube 19. The blade drive member 18 drives the blade 17 to rotate to cut grass, thereby realizing the adjustment of the cutting height. When the lawn mower encounters an obstacle or high dense grass during driving, the two parallel rod assemblies will be lifted by the upward force to increase the distance between the cutting assembly and the working surface. Even if the cutting assembly is at a lower cutting height, the floating effect of the cutting assembly can ensure that the lawn mower has good passability. The height adjustment mechanism of the present application can ensure the floating property of the cutting assembly while achieving cutting height adjustment, so that the lawn mower can better adapt to various terrains and lawn conditions, improve the adaptability and flexibility of the lawn mower, and increase the overall aesthetics and growth conditions of the lawn. Furthermore, height adjustment is achieved through limited structures such as the camshaft 8, the limit protrusion 2, and the first cam surface 9. The structure is simple, the cost and failure rate are reduced, and it helps to maintain the stability of the lawn mower during operation. The stable mowing height and cutting action can reduce the vibration and noise of the machine, and improve the operating efficiency and service life.

[0081] It is worth mentioning that the lawn mower of the present invention adopts two parallel rod assemblies, and the limiting protrusion 2 is set on the top rod 5. When the camshaft 8 drives the first cam surface 9 to rotate, accompanied by the ups and downs of the spiral surface, the position where the limiting protrusion 2 abuts against the first cam surface 9 is placed on the side of the parallel rod assembly, which can increase the height adjustment range of the lawn mower and solve the technical problem of the narrow mowing height adjustment range of the existing lawn mower.

[0082] Furthermore, some lawn mowers with self-locking functions in the prior art are often complex in design to adapt to the original lifting structure, which increases the cost and has a high failure rate. However, the lawn mower of the utility model utilizes the self-locking function of the worm gear structure 702 to ensure that the camshaft 8 can only be driven to rotate by the driving force of the driving member 701, and has a simple structure, which further improves the stability of the structure and reduces the cost and failure rate.

[0083] In this embodiment, if Figure 1-4As shown, the two sides of the support tube 19 are connected to the other ends of the top rod 5 and the bottom rod 6 of the two parallel rod assemblies through the support rod 4. The lawn mower also includes a cutter disc 21, and the blade 17 is arranged at the edge of the cutter disc 21. The output shaft of the blade drive 18 extends from the support tube 19 and is connected to the cutter disc 21, and drives the cutter disc 21 to rotate. The blade 17 arranged at the edge of the cutter disc 21 can obtain a higher rotation speed, so as to achieve faster lawn mowing and improve work efficiency. Further, in this embodiment, the lawn mower includes a plurality of blades 17, and the outer contour of the cutter disc 21 is a disc. The plurality of blades 17 are respectively arranged at the edge of the cutter disc 21 in a centrally symmetrical manner. Specifically, the number of blades 17 is preferably three.

[0084] In this embodiment, if Figure 1-4 As shown, the lawn mower also includes a mowing baffle 22, which is arranged on the periphery of the rotation radius of the blade 17 to improve the safety of the lawn mower, prevent the blade 17 from hitting hard objects and causing damage, and prevent the human body from directly contacting the blade 17 and causing safety accidents.

[0085] In this embodiment, the lawn mower further includes a travel assembly, which is disposed on the fixed housing 20 and is used to drive the lawn mower to move. The lawn mower further includes a control assembly, which is electrically connected to the blade drive 18 and the drive 701, so as to control the start and stop, rotation direction and rotation speed of the drive 701 and the blade drive 18.

[0086] In this embodiment, the blade drive 18 also uses a drive motor. Due to the advantages of easy control, quick response and easy integration of the drive motor, the drive motor is used as the blade drive. Through the control component, the start and stop of the blade 17 and the speed and other parameters can be controlled more flexibly and conveniently. At the same time, its smaller size also makes it easier to be directly set in the support tube 19. Of course, in order to obtain better endurance and power, the blade drive 18 can also use other mechanisms as the power source.

[0087] In summary, the height adjustment mechanism and lawn mower of the utility model have the following advantages:

[0088] (1) A limiting protrusion 2 capable of sliding relative to the first cam surface 9 is provided on the side wall of the push rod 5. When the camshaft 8 drives the first cam surface 9 to rotate, the limiting protrusion 2 rises or falls along with the ups and downs of the spiral surface, thereby driving the two parallel rod assemblies to rotate up and down, thereby increasing the range of mowing height adjustment.

[0089] (2) Height adjustment is achieved through limited structures such as the camshaft 8, the limiting protrusion 2, and the first cam surface 9. The structure is simple, which reduces costs and failure rates, and helps to maintain the stability of the lawn mower during operation. The stable mowing height and cutting action can reduce the vibration and noise of the machine, thereby improving operating efficiency and service life.

[0090] (3) Due to the self-locking function of the worm gear structure 702, when the camshaft 8 is subjected to external force or vibration, the camshaft 8 cannot overcome the self-locking force of the worm gear structure 702 and move, thereby ensuring that the camshaft 8 can only be driven to rotate by the driving force of the driving member 701, thereby improving the stability of the structure and simplifying the structure.

[0091] (4) The mowing baffle 22 is used to improve the safety of the lawn mower, preventing the blade 17 from being damaged by hitting hard objects, and preventing the human body from directly contacting the blade 17 and causing safety accidents.

[0092] (5) The lawn mower includes a cutter disc 21 and a plurality of blades 17 disposed on the edge of the cutter disc 21, which can achieve rapid lawn mowing and improve work efficiency.

[0093] (6) The springs 16 provided on the two parallel rod assemblies provide an upward force for the up and down rotation of the two parallel rod assemblies, which helps to stabilize the position of the parallel rod assemblies and provide additional power support for the parallel rod assemblies.

[0094] In summary, the utility model effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0095] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A height adjustment mechanism, characterized in that: include: A lifting assembly, the lifting assembly comprising a fixed base (1), two parallel rod assemblies hinged at one end to the fixed base (1), and a connecting assembly connecting the two parallel rod assemblies, wherein a limiting protrusion (2) is provided on one of the parallel rod assemblies; A lifting drive assembly, the lifting drive assembly comprising a lifting drive member (7), a cam shaft (8) connected to the lifting drive member (7), and a first cam surface (9) arranged around the cam shaft (8) in the form of a spiral surface; the cam shaft (8) is rotatably arranged on the fixed base (1); The lifting drive member (7) drives the camshaft (8) to rotate, and drives the first cam surface (9) to rotate. As the first cam surface (9) rotates, relative sliding occurs between the limit protrusion (2) and the spiral surfaces of different heights on the first cam surface (9). As the spiral surfaces rise and fall, the limit protrusion (2) rises or falls, thereby driving the two parallel rod assemblies to rotate up and down respectively along the hinges with the fixed base (1).

2. The height adjustment mechanism according to claim 1, characterized in that: The parallel rod assembly comprises a support rod (4) and a top rod (5) and a bottom rod (6) which are arranged parallel to each other; a fixed rod (3) is vertically arranged on the fixed base (1); one end of the top rod (5) and the bottom rod (6) are respectively hinged to the top end and the bottom end of the fixed rod (3), and the other end is respectively hinged to the two ends of the support rod (4); the limiting protrusion (2) is arranged on one of the top rods (5).

3. The height adjustment mechanism according to claim 2, characterized in that: A limiting protrusion (2) is also provided on the other push rod (5), and the lifting drive assembly further comprises a second cam surface (10) which is arranged around the cam shaft (8) and is in the form of a spiral surface, and the limiting protrusion (2) on the other push rod (5) can slide relative to the second cam surface (10).

4. The height adjustment mechanism according to claim 1, characterized in that: The first cam surface (9) is provided with a long strip sliding groove, and the limiting protrusion (2) can slide along the long strip sliding groove along with the ups and downs of the spiral surface.

5. The height adjustment mechanism according to claim 1, characterized in that: The lifting drive assembly also includes a first connecting sleeve (11), and the lifting drive member (7) is connected to the first connecting sleeve (11) through an interference fit; a plurality of keys are axially arranged on the outer side of the camshaft (8); a keyway matching the key on the outer side of the camshaft (8) is arranged inside the first connecting sleeve (11), and the shape, size and distribution position of the keyway correspond one-to-one with the key on the camshaft (8), and the key is embedded in the keyway, so that the camshaft (8) and the first connecting sleeve (11) are connected through multiple teeth to achieve a clearance or transition fit.

6. The height adjustment mechanism according to claim 2, characterized in that: The connecting assembly comprises a first crossbeam (12) and a second crossbeam (13); the top rods (5) of the two parallel rod assemblies are connected via the first crossbeam (12); the bottom rods (6) of the two parallel rod assemblies are connected via the second crossbeam (13); an extension portion (501) is provided on the side of the top rod (5); the limiting protrusion (2) is provided on the extension portion (501); and the length of the extension portion (501) does not exceed one third of the length of the crossbeam.

7. The height adjustment mechanism according to claim 1, characterized in that: The lifting assembly further comprises a protruding shaft (15) vertically arranged on the fixed base (1), and the cam shaft (8) is rotatably sleeved on the protruding shaft (15).

8. The height adjustment mechanism according to claim 1, characterized in that: The lifting drive member (7) comprises a drive member (701) and a worm gear structure (702) connected to the drive member (701), and the worm gear structure (702) is connected to the camshaft (8).

9. The height adjustment mechanism according to claim 2, characterized in that: The lifting assembly further comprises a spring (16), one end of the spring (16) being connected to the top rod (5), and the other end of the spring (16) being connected to the bottom rod (6); when the two parallel rod assemblies rotate up and down, the spring (16) is always in a stretched state.

10. A lawn mower, characterized in that: include: The height adjustment mechanism according to any one of claims 1 to 9; A cutting assembly, the cutting assembly comprising a blade (17), a blade driving member (18) and a support tube (19) for accommodating the blade driving member (18); the other ends of the two parallel rod assemblies are hinged to the two sides of the support tube (19); the output shaft of the blade driving member (18) extends from the support tube (19) and is connected to the blade (17); A fixed shell (20), wherein a chamber for accommodating the height adjustment mechanism is arranged in the fixed shell (20); the cutting assembly is arranged on the fixed shell (20); when the two parallel rod assemblies rotate up and down along the hinges with the fixed base (1), the blade (17) is driven to move up and down through the support tube (19).

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