Mowing machine capable of adjusting height of tool bit

Abstract

The invention discloses a mower capable of adjusting the height of a cutter head, which relates to the technical field of mowers and comprises a rack, a chassis, a lifting mechanism, a linear lifting guide mechanism and a lifting driving mechanism, a tool bit assembly is arranged on the chassis; the lifting mechanism comprises a lifting connecting rod mechanism, and the lifting connecting rod mechanism comprises a first adjusting arm and a second adjusting arm; a hinge seat is arranged on the chassis; the first adjusting arm is provided with a hinge part; the linear lifting guide mechanism comprises a linear guide rail and a guide sliding piece; when the rack is horizontally arranged, the linear guide rail is arranged in a vertical guiding mode, and the height change path of the chassis is limited to be a vertical path. Through the arrangement, when the rack is horizontally arranged, the chassis can be vertically lifted to adjust the pruning height; when the trimming height is adjusted, the overall gravity center does not incline forwards or backwards obviously, and control over a mower body is facilitated; meanwhile, the blades can be well prevented from being damaged, and the mowing resistance and impact borne by the blades in the lifting process are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of lawn mowers, and in particular to a lawn mower with an adjustable cutter head height. Background Art

[0002] At present, most of the mowing height lifting structures of lawn mowers are like the "wheeled liftable cutter disc" proposed in the Chinese utility model with the announcement number CN212064908U. The height adjustment device is a parallelogram connecting rod structure, including two connecting rods, a connecting rod and an electric push rod; wherein, the two connecting rods are respectively arranged in parallel at the front and rear ends of the frame; each of the connecting rods is provided with three hinge points, including an upper hinge point at the upper end, a middle hinge point at the middle part and a lower hinge point at the lower end; the lower hinge point is hinged to the frame, and the middle hinge point is hinged to the frame; the connecting rod is arranged between the two connecting rods, and the two ends of the connecting rod are respectively hinged to the two upper hinge points; one end of the electric push rod is hinged to the frame, and the other end is hinged to one of the upper hinge points of the connecting rods.

[0003] When the height of the frame with the cutting knife is adjusted, the electric push rod is used for driving, and under the action of the parallelogram connecting rod structure, the height of the frame with the cutting knife can be adjusted.

[0004] However, when the height of the rack is adjusted by the parallelogram connecting rod structure, the rack will also move forward or backward by a certain amount due to the rotation of the parallelogram connecting rod structure.

[0005] In this type of lawn mower, especially when a heavy internal combustion engine is used as the power source for driving the cutter disc, if the lawn mower moves forward and backward during the lifting process, the center of gravity of the lawn mower will move forward or backward significantly, which is not conducive to the control of the lawn mower body; In addition, it is easy to hit the hard obstacles in front due to the additional forward movement or the additional backward movement during lifting, which will cause great damage to the blade and the output shaft of the internal combustion engine; Furthermore, when the chassis is raised or lowered while the blade is rotating to mow the grass, the additional forward movement or the additional backward movement during the raising or lowering process may cause large mowing resistance and impact, thereby reducing the vehicle's passability. Summary of the Invention

[0006] In order to overcome the above-mentioned shortcomings, the present invention aims to provide a technical solution to the above-mentioned problems.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: a lawn mower with adjustable cutter head height, comprising a frame, a chassis, a lifting mechanism, a linear lifting guide mechanism and a lifting drive mechanism; A cutter head assembly is provided on the chassis; The lifting mechanism includes a lifting link mechanism, and the lifting link mechanism includes a first adjusting arm and a second adjusting arm; An articulated seat is provided on the chassis, one end of the second adjusting arm is rotatably connected to the articulated seat of the chassis, and the other end of the second adjusting arm is rotatably connected to one end of the first adjusting arm; The first adjusting arm has a hinge portion, which is rotatably connected to the frame; The other end of the first adjustment arm is adapted to be driven by the lifting drive mechanism, and when the lifting drive mechanism drives the first adjustment arm so that the first adjustment arm rotates on the frame, the height of one end of the first adjustment arm changes accordingly; The linear lifting guide mechanism includes a linear guide rail and a guide slide slidably disposed on the linear guide rail. The connecting portion on the linear guide rail and the connecting portion on the guide slide correspond to two different connecting portions of the linear lifting guide mechanism. The first connecting portion of the linear lifting guide mechanism is connected to the chassis, and the second connecting portion of the linear lifting guide mechanism is connected to the frame. When the frame is in a horizontal setting, the linear guide rail is in a vertical guiding setting, and the height change path of the chassis is limited to a vertical path.

[0008] A further technical solution of the present invention is that the lifting link mechanism further includes a third adjusting arm and a fourth adjusting arm; On the first adjusting arm, the arm length portion from the hinge portion to one end of the first adjusting arm forms a first force arm; One end of the fourth adjusting arm is rotatably connected to the hinge seat of the chassis, the other end of the fourth adjusting arm is rotatably connected to one end of the third adjusting arm, and the other end of the third adjusting arm is rotatably connected to the hinge portion; The length of the third adjustment arm is the same as that of the first force arm, and the length of the fourth adjustment arm is the same as that of the second adjustment arm.

[0009] A further technical solution of the present invention is as follows: the lifting mechanism includes two lifting link mechanisms, the two lifting link mechanisms are spaced apart along the rotation radial direction of the hinge portion, and the two lifting link mechanisms are respectively a first lifting link mechanism and a second lifting link mechanism; The lifting mechanism further includes a first connecting rod, one end of which is rotatably connected to the first adjusting arm of the first lifting link mechanism, and the other end of the first connecting rod is rotatably connected to the first adjusting arm of the second lifting link mechanism.

[0010] A further technical solution of the present invention is that the rotation axis of the hinge portion corresponds to the left and right direction when the frame moves forward, and the first lifting link mechanism and the second lifting link mechanism are arranged with a front-to-back interval in the rotation radial direction corresponding to the front-to-back direction.

[0011] A further technical solution of the present invention is that two lifting mechanisms are provided, and the two lifting mechanisms are spaced apart along the rotation axis of the hinge portion, and the two lifting mechanisms are respectively a first lifting mechanism and a second lifting mechanism; There are two lifting drive mechanisms, which act on the first lifting mechanism and the second lifting mechanism respectively.

[0012] A further technical solution of the present invention is that the rotation axis of the hinge portion corresponds to the left and right directions when the frame moves forward, and the first lifting mechanism and the second lifting mechanism are arranged at intervals on the left and right.

[0013] A further technical solution of the present invention is that two linear lifting guide mechanisms are provided, and the two linear lifting guide mechanisms are respectively a first linear lifting guide mechanism and a second linear lifting guide mechanism; The linear guide rail of the first linear lifting guide mechanism is installed on the left side of the chassis, the opening of the linear guide rail of the first linear lifting guide mechanism faces left, the guide sliding member of the first linear lifting guide mechanism is arranged in the form of a roller, and the guide sliding member of the first linear lifting guide mechanism is rotatably connected to the left side of the frame; The linear guide rail of the second linear lifting guide mechanism is installed on the right side of the chassis, the opening of the linear guide rail of the second linear lifting guide mechanism faces right, the guide sliding member of the second linear lifting guide mechanism is arranged as a roller, and the guide sliding member of the second linear lifting guide mechanism is rotatably connected to the right side of the frame.

[0014] A further technical solution of the present invention is that the hinge portion is located on the first adjustment arm between one end of the first adjustment arm and the other end of the first adjustment arm; On the first adjusting arm, the arm length portion from the hinge portion to one end of the first adjusting arm forms a first force arm; The arm length portion from the hinge portion to the other end of the first adjusting arm forms a second lever arm, and the length of the second lever arm is greater than the length of the first lever arm.

[0015] A further technical solution of the present invention is as follows: the lifting drive mechanism includes a linear drive assembly, the linear drive assembly includes a driving body and a moving part driven by the driving body to move linearly, the mounting portion on the driving body and the mounting portion on the moving part corresponding to two different mounting portions constituting the linear drive assembly; When the driving body drives the moving part to move linearly, the distance between the two mounting parts changes; The first mounting portion of the linear drive assembly is rotatably connected to the frame, and the second mounting portion of the linear drive assembly is rotatably connected to the other end of the first regulating arm.

[0016] A further technical solution of the present invention is as follows: the linear drive assembly includes an electric push rod, the cylinder body of the electric push rod and the piston rod of the electric push rod are the driving body and the moving part respectively.

[0017] A further technical solution of the present invention is that the second mounting portion is provided with a bidirectional buffer device, and the second mounting portion is rotatably connected to the other end of the first adjusting arm through the bidirectional buffer device; The moving component of the linear drive assembly is driven to move along a straight line and has a first moving direction in the straight line that increases the distance between the first mounting portion and the second mounting portion, and a second moving direction opposite to the first moving direction. The bidirectional buffer device is configured to perform buffering along a first moving direction and to perform buffering along a second moving direction.

[0018] A further technical solution of the present invention is as follows: the bidirectional buffer device comprises a linear sliding guide rail and a sliding member slidably arranged on the linear sliding guide rail, wherein the sliding member has a resisting portion; A first buffer spring and a second buffer spring are provided on the linear sliding guide rail, and the linear movement direction of the sliding member on the linear sliding guide rail is the same as the linear movement direction of the moving part of the linear drive assembly when driven by the driving body; When the sliding member slides along the first moving direction, the resisting portion and the linear sliding guide rail jointly press the first buffer spring; when the sliding member slides along the second moving direction, the resisting portion and the linear sliding guide rail jointly press the second buffer spring; A connecting shaft is connected to the sliding member, and the connecting part on the connecting shaft and the connecting part on the linear sliding guide rail constitute two different connecting parts of the bidirectional buffer device. The first connecting part is connected to the second mounting part, and the second connecting part is rotatably connected to the other end of the first adjusting arm.

[0019] Further technical solution of the present invention: When the linear drive assembly includes an electric push rod, The linear sliding guide is arranged in a cylindrical shape, and one end of the linear sliding guide is connected to the outer end of the piston rod; The sliding member is slidably arranged in the cylinder of the linear sliding guide rail, and the first buffer spring and the second buffer spring are spiral compression springs. The first buffer spring is arranged in the cylinder of the linear sliding guide rail and is located between the sliding member and the other end of the linear sliding guide rail, and the second buffer spring is arranged in the cylinder of the linear sliding guide rail and is located between the sliding member and one end of the linear sliding guide rail. One end of the linear sliding guide rail is provided with a through opening communicating with the cylinder, one end of the connecting shaft is configured to penetrate into the cylinder from the through opening and be connected to the sliding member, and the first buffer spring is configured to be sleeved on the outside of the connecting shaft in the cylinder. The end portion of the connecting shaft located outside the cylinder of the linear sliding guide rail is rotatably connected to the other end of the first regulating arm.

[0020] Compared with the existing technology, the beneficial effects of this technical solution are: through the above-mentioned setting, when the frame is in a horizontal setting, the chassis can be raised and lowered vertically to adjust the mowing height; when adjusting the mowing height, the overall center of gravity will not produce a significant forward or backward tilt, which is conducive to the control of the lawn mower body; at the same time, it can better avoid damage to the blade and reduce the mowing resistance and impact during lifting and lowering.

[0021] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Figure 1 It is a structural stereogram of the present invention; Figure 2 It is another structural stereogram of the present invention, which is Figure 1 The viewing direction is different; Figure 3 A schematic diagram of the cooperation between the frame and the chassis of the present invention; Figure 4 This is another schematic diagram of the cooperation between the frame and the chassis of the present invention. Figure 3 The viewing direction is different; Figure 5 Schematic diagram of the cooperation between the linear guide rail and the guide sliding member of the present invention; Figure 6 It is a connection diagram of the bidirectional buffer device of the present invention; Figure 7 for Figure 6 A schematic diagram of the enlarged local structure of the bidirectional buffer device at point A; The corresponding reference numerals in the accompanying drawings are described as follows: rack-1, Chassis-2, articulated seat-201, First lifting mechanism-3a, second lifting mechanism-3b, lifting link mechanism-31, first connecting rod-32, First lifting link mechanism 31a, second lifting link mechanism 31b, first adjustment arm 311, second adjustment arm 312, third adjustment arm 313, fourth adjustment arm 314, hinge 3111, first lever arm 3112, second lever arm 3113, First linear lifting guide mechanism-4a, second linear lifting guide mechanism-4b, linear guide rail-401, guide slide-402, first connecting part-403, second connecting part-404, Cutter head assembly-5, Cutter head drive assembly-6, Walking mechanism-7, left walking assembly-701, right walking assembly-702, left walking drive assembly-703, right walking drive assembly-704, First lifting drive mechanism-8a, second lifting drive mechanism-8b, linear drive assembly-81, drive body-811, moving part-812, first mounting part-813, second mounting part-814, bidirectional buffer device-815, linear sliding guide rail-8151, sliding part-8152, supporting part-8153, first buffer spring-8154, second buffer spring-8155, connecting shaft-8156. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] See also Figure 1-7 A lawn mower with adjustable cutter head height includes a frame 1, a chassis 2, a lifting mechanism and a linear lifting guide mechanism, wherein the lifting mechanism is used to drive the chassis to perform lifting activities relative to the frame.

[0026] A cutter head assembly 5 and a cutter head driving assembly 6 for driving the cutter head assembly to work are provided on the chassis 2. The cutter head assembly 5 can be used to trim grass, bushes, etc. The height of the chassis 2 is adjusted by the lifting mechanism, so that the trimming height of the cutter head assembly 5 can be adjusted.

[0027] The frame 1 is provided with a traveling mechanism 7, which is used to enable the frame 1 to be conveniently moved on the ground.

[0028] In some embodiments, the traveling mechanism 7 includes a left traveling assembly 701 and a right traveling assembly 702 respectively arranged on the left and right sides of the forward direction of the lawn mower.

[0029] In some embodiments, the traveling assembly includes, for example, a traveling wheel set.

[0030] In some embodiments, the lawn mower can be manually propelled for walking.

[0031] In some embodiments, the travel wheel groups of the left travel assembly and the right travel assembly of the lawn mower can be driven by the same travel drive assembly; in other embodiments, they can also be driven separately by different travel drive assemblies, such as the left travel drive assembly 703 drives the left travel assembly 701, and the right travel drive assembly 704 drives the right travel assembly 702.

[0032] The travel drive assembly includes, for example, power parts such as a motor and an internal combustion engine.

[0033] In some embodiments, the travel drive assembly further includes a power transmission assembly to transmit the power output by the power member of the travel drive assembly to the corresponding travel wheel assembly.

[0034] In some embodiments, the travel assembly includes, for example, a travel track assembly. The travel track assemblies of the left and right travel assemblies may be driven by the same travel drive assembly; in other embodiments, they may be driven independently by different travel drive assemblies, such as the left travel drive assembly driving the left travel assembly and the right travel drive assembly driving the right travel assembly.

[0035] like Figure 1 As shown, the walking track assembly of the left walking assembly 701 is driven by the motor of the left walking drive assembly 703, and the walking track assembly of the right walking assembly 702 is driven by the motor of the right walking drive assembly 704, so as to have greater travelability.

[0036] In this embodiment, the lifting mechanism includes a lifting link mechanism 31. The lifting link mechanism 31 is provided between the frame 1 and the chassis 2.

[0037] In this embodiment, the lawn mower with adjustable cutter head height also includes a lifting drive mechanism, which is used to drive the lifting link mechanism 31 to change the connecting rod shape of the lifting link mechanism 31, so that the chassis 2 is raised or lowered relative to the frame 1 under the action of the lifting link mechanism 31.

[0038] A linear lift guide mechanism is provided between the frame 1 and the chassis 2. When the chassis 2 is raised or lowered relative to the frame 1, the linear lift guide mechanism guides the chassis 2, limiting its rise or fall to a linear motion. For example, when the frame 1 is horizontal, the chassis 2 can be limited to vertical lift.

[0039] In this embodiment, the lifting link mechanism 31 includes a first adjusting arm 311 and a second adjusting arm 312 .

[0040] An articulated seat 201 is provided on the chassis 2, one end of the second adjusting arm 312 is rotatably connected to the articulated seat 201 of the chassis, the other end of the second adjusting arm 312 is rotatably connected to one end of the first adjusting arm 311, and the other end of the first adjusting arm 311 is suitable for being driven by the lifting drive mechanism.

[0041] The first adjusting arm 311 has a hinge portion 3111 , and the hinge portion 3111 is rotatably connected to the frame 1 .

[0042] The lifting drive mechanism drives the first adjusting arm 311 so that when the first adjusting arm 311 rotates on the frame 1, the height of one end of the first adjusting arm 311 changes accordingly; at this time, through the connection with the second adjusting arm 312, the height of the chassis 2 also changes; for example, when the height of one end of the first adjusting arm 311 increases, the height of the chassis 2 correspondingly increases; when the height of one end of the first adjusting arm 311 decreases, the height of the chassis 2 correspondingly decreases.

[0043] In this embodiment, the linear lifting guide mechanism includes a linear guide rail 401 and a guide slide 402 slidably arranged on the linear guide rail. The connecting portion on the linear guide rail 401 and the connecting portion on the guide slide 402 correspond to two different connecting portions (403, 404) constituting the linear lifting guide mechanism.

[0044] The first connection portion 403 of the linear lifting guide mechanism is connected to the chassis 2 , and the second connection portion 404 of the linear lifting guide mechanism is connected to the frame 1 .

[0045] When the height of the chassis 2 changes, the height change path of the chassis 2 is limited to a straight path through the linear guidance of the linear guide rail 401 and the guide slide 402 and the rotation connection of the second adjustment arm 312.

[0046] When the frame 1 is in a horizontal setting, the height change path of the chassis 2 can be set to be defined as a vertical path.

[0047] In some embodiments, the matching mode between the linear guide rail 401 and the guide sliding member 402 can be set to corresponding shapes according to different needs, such as being set to a sliding match between a round shaft and a guide sleeve, being set to a sliding match between a square shaft and a U-shaped slide rail, being set to a sliding match between a polygonal shaft and a polygonal slide rail groove, etc.

[0048] In some embodiments, the lifting drive mechanism includes a linear drive assembly 81, which includes a driving body 811 and a moving part 812 driven by the driving body to move linearly. The mounting portion on the driving body 811 and the mounting portion on the moving part 812 correspond to two different mounting portions (813, 814) constituting the linear drive assembly.

[0049] When the driving body 811 drives the moving part 812 to move linearly, the distance between the two mounting parts (813, 814) changes. For example, the two mounting parts are driven to adjust to shorten the distance, or the two mounting parts are driven to adjust to lengthen the distance.

[0050] The first mounting portion 813 of the linear drive assembly is rotatably connected to the frame 1 , and the second mounting portion 814 of the linear drive assembly is rotatably connected to the other end of the first adjustment arm 311 .

[0051] When the driving body 811 of the linear drive assembly drives the moving part 812 to move linearly (the two mounting parts are driven to adjust to a shorter spacing or the two mounting parts are replaced and adjusted to a longer spacing), the first adjusting arm 311 is acted upon to rotate on the frame 1 through the rotational connection between the first mounting part 813 and the frame 1, the rotational connection between the second mounting part 814 and the other end of the first adjusting arm 311, and the rotational connection between the hinge part 3111 and the frame 1.

[0052] It can be understood that the other end of the first adjustment arm 311 is pushed or pulled by the linear drive assembly 81 , so that the first adjustment arm 311 can rotate on the frame 1 through the rotational connection between the hinge portion 3111 and the frame 1 .

[0053] When the first adjustment arm 311 rotates on the frame 1, the height of one end of the first adjustment arm 311 changes accordingly. At this time, through the connection with the second adjustment arm 312 and the lifting guidance of the linear lifting guide mechanism, the chassis 2 can be raised and lowered along a specified path.

[0054] In some embodiments, the linear drive assembly 81 includes an electric push rod, the cylinder body of the electric push rod and the piston rod of the electric push rod are respectively the driving body and the moving part of the linear drive assembly, and the operation of the electric push rod causes the piston rod to extend and retract.

[0055] The first mounting portion 813 of the linear drive assembly can be a connector on the cylinder of the electric push rod, and the second mounting portion 814 of the linear drive assembly can be a connector on the piston rod of the electric push rod located outside the cylinder. In other embodiments, the positions of the two mounting portions can be interchanged, so that the first and second mounting portions represent different locations.

[0056] In some embodiments, the lifting linkage mechanism 31 further includes a third adjustment arm 313 and a fourth adjustment arm 314 .

[0057] On the first adjustment arm 311 , the arm length portion from the hinge portion 3111 to one end of the first adjustment arm 311 forms a first force arm 3112 .

[0058] One end of the fourth adjustment arm 314 is rotatably connected to the hinge seat 201 of the chassis, the other end of the fourth adjustment arm 314 is rotatably connected to one end of the third adjustment arm 313 , and the other end of the third adjustment arm 313 is rotatably connected to the hinge portion 3111 .

[0059] In some embodiments, the length of the third adjustment arm 313 is the same as the length of the first force arm 3112 , and the length of the fourth adjustment arm 314 is the same as the length of the second adjustment arm 312 .

[0060] Specifically, a length L1 from the rotational connection position of the hinge portion on the first force arm to the rotational connection position on one end of the first adjustment arm, and a length L3 from the rotational connection position on one end of the third adjustment arm to the rotational connection position on the other end of the third adjustment arm satisfy L1=L3; The length distance L2 from the rotational connection position on one end of the second adjusting arm to the rotational connection position on the other end of the second adjusting arm, and the length distance L4 from the rotational connection position on one end of the fourth adjusting arm to the rotational connection position on the other end of the fourth adjusting arm satisfy L2=L4.

[0061] The first force arm 3112 , the second adjustment arm 312 , the third adjustment arm 313 , and the fourth adjustment arm 314 form a quadrilateral connecting rod structure.

[0062] like Figure 3 、 4 As shown, under the condition of being able to lift vertically, an independent quadrilateral connecting rod structure can be formed between each hinge part and the corresponding hinge seat.

[0063] During the lifting and lowering process, when the chassis is hit, no matter it is a front impact or a rear impact, the independent quadrilateral connecting rod structure can form a tensioning + supporting effect between each hinge part and the corresponding hinge seat.

[0064] Specifically, the first force arm 3112 and the second adjustment arm 312 constitute a first force-bearing structure, and the third adjustment arm 313 and the fourth adjustment arm 314 constitute a second force-bearing structure.

[0065] When the first force-bearing structure formed by the first force arm 3112 and the second adjustment arm 312 provides tension, the second force-bearing structure formed by the third adjustment arm 313 and the fourth adjustment arm 314 can simultaneously provide support. Conversely, when the first force-bearing structure formed by the first force arm 3112 and the second adjustment arm 312 provides support, the second force-bearing structure formed by the third adjustment arm 313 and the fourth adjustment arm 314 can simultaneously provide tension, thereby achieving uniform force distribution and impact resistance.

[0066] When the chassis is hit, each hinged portion and the corresponding hinged seat can obtain a unique protection effect through the independent quadrilateral connecting rod structure, which can better protect the lifting connecting rod mechanism when the chassis is hit.

[0067] In some embodiments, the length of the third adjustment arm 313 is the same as the length of the first force arm 3112 , the length of the fourth adjustment arm 314 , and the length of the second adjustment arm 312 .

[0068] Specifically, the length distance L1 from the rotation connection position of the hinge part on the first force arm to the rotation connection position on one end of the first adjusting arm, the length distance L3 from the rotation connection position on one end of the third adjusting arm to the rotation connection position on the other end of the third adjusting arm, the length distance L2 from the rotation connection position on one end of the second adjusting arm to the rotation connection position on the other end of the second adjusting arm, and the length distance L4 from the rotation connection position on one end of the fourth adjusting arm to the rotation connection position on the other end of the fourth adjusting arm, satisfy L1=L2=L3=L4.

[0069] The first force arm 3112 , the second adjustment arm 312 , the third adjustment arm 313 , and the fourth adjustment arm 314 form an equilateral quadrilateral connecting rod structure.

[0070] In this embodiment, by setting the first force arm 3112, the second adjustment arm 312, the third adjustment arm 313, and the fourth adjustment arm 314, when the chassis 2 is driven to rise and fall, it can play a good force balancing role and has good impact resistance.

[0071] In some embodiments, the hinge portion 3111 is located on the first adjustment arm between one end of the first adjustment arm 311 and the other end of the first adjustment arm 311 .

[0072] The arm length from the hinge portion 3111 to the other end of the first adjustment arm 311 forms a second lever arm 3113 , and the length of the second lever arm 3113 is greater than that of the first lever arm 3112 .

[0073] Please refer to the following for details: Figure 6 The length distance L1 from the rotation connection position of the hinge part on the first force arm 3112 to the rotation connection position on one end of the first adjustment arm, and the length distance L5 from the rotation connection position of the hinge part on the second force arm 3113 to the rotation connection position on the other end of the first adjustment arm satisfy L1<L5, which makes it easier to drive the chassis 2 to rise and fall, and makes the impact force reacting to the lifting drive mechanism smaller.

[0074] like Figure 3 、 6As shown, in some embodiments, the first mounting portion 813, the second mounting portion 814, the first adjustment arm 311, the second adjustment arm 312, the third adjustment arm 313, and the fourth adjustment arm 314 have the same rotation axis. The rotation axis is horizontally arranged, for example, corresponding to the left and right directions when the rack moves forward.

[0075] In some embodiments, the lifting mechanism includes two lifting link mechanisms, which are spaced apart along the rotation radial direction of the hinge portion. The two lifting link mechanisms are respectively a first lifting link mechanism 31 a and a second lifting link mechanism 31 b .

[0076] The lifting mechanism further includes a first connecting rod 32 , one end of which is rotatably connected to the first adjustment arm of the first lifting link mechanism 31 a , and the other end of the first connecting rod 32 is rotatably connected to the first adjustment arm of the second lifting link mechanism 31 b .

[0077] When the first adjustment arm of the first lifting link mechanism 31 a rotates, the first adjustment arm of the second lifting link mechanism 31 b rotates accordingly.

[0078] When the rotation axis of the hinge portion 3111 is the left-right direction, the first lifting link mechanism 31 a and the second lifting link mechanism 31 b may be arranged with a front-to-back spacing in a rotation radial direction corresponding to the front-to-back direction.

[0079] In some embodiments, two lifting mechanisms are provided, and the two lifting mechanisms are spaced apart along the rotation axis of the hinge portion. The two lifting mechanisms are respectively a first lifting mechanism 3a and a second lifting mechanism 3b.

[0080] For example, the rotation axis of the hinge portion 3111 is in the left-right direction, and the first lifting mechanism 3a and the second lifting mechanism 3b can be arranged with a left-right spacing.

[0081] In some embodiments, there are two lifting drive mechanisms, which act on the first lifting mechanism and the second lifting mechanism respectively. For example, the two lifting drive mechanisms are the first lifting drive mechanism 8a and the second lifting drive mechanism 8b.

[0082] The first lifting drive mechanism 8a acts on the first lifting mechanism 3a, and the second lifting drive mechanism 8b acts on the second lifting mechanism 3b, so that the first lifting mechanism 3a and the second lifting mechanism 3b can both obtain driving force to adjust the height of the chassis 2.

[0083] In some embodiments, the second mounting portion 814 has a bidirectional buffer device 815 , and the second mounting portion 814 is rotatably connected to the other end of the first adjustment arm 311 through the bidirectional buffer device 815 thereon.

[0084] The moving part 812 of the linear drive assembly can be driven to move along a straight line direction, and has a first moving direction in the straight line direction that increases the distance between the first mounting part and the second mounting part, and has a second moving direction opposite to the first moving direction, or it can be understood that it has a second moving direction in the straight line direction that reduces the distance between the first mounting part and the second mounting part.

[0085] The bidirectional buffer device 815 is configured to buffer along a first moving direction and a second moving direction, so as to play a bidirectional vibration reduction role when the chassis 2 is subjected to a large impact force, thereby better resisting the impact.

[0086] In some embodiments, the bidirectional buffer device 815 includes a linear sliding guide rail 8151 and a sliding member 8152 slidably mounted on the linear sliding guide rail, and the sliding member 8152 has a blocking portion 8153 .

[0087] A first buffer spring 8154 and a second buffer spring 8155 are provided on the linear sliding guide rail 8151 .

[0088] The linear movement direction of the sliding member 8152 on the linear sliding guide rail 8151 is the same as the linear movement direction of the moving part 812 of the linear drive assembly when driven by the driving body.

[0089] When the sliding member 8152 slides along the first moving direction, the supporting portion 8153 and the linear sliding guide rail 8151 jointly press the first buffer spring 8154; when the sliding member 8152 slides along the second moving direction, the supporting portion 8153 and the linear sliding guide rail 8151 jointly press the second buffer spring 8155.

[0090] The sliding member 8152 is connected to a connecting shaft 8156. The connecting portion on the connecting shaft 8156 and the connecting portion on the linear sliding guide rail 8151 constitute two different connecting portions of the bidirectional buffer device. The first connecting portion is connected to the second mounting portion 814, and the second connecting portion is rotatably connected to the other end of the first adjusting arm 311.

[0091] In some embodiments, when the linear drive assembly 81 includes an electric push rod: the linear sliding guide 8151 is arranged in a cylindrical shape, and one end of the linear sliding guide 8151 is connected to the outer end of the piston rod; the sliding member 8152 is slid in the cylinder of the linear sliding guide 8151; the first buffer spring 8154 and the second buffer spring 8155 are spiral compression springs, the first buffer spring 8154 is arranged in the cylinder of the linear sliding guide 5151 and is located between the sliding member 5152 and the other end of the linear sliding guide 5151, and the second buffer spring 8155 is arranged in the cylinder of the linear sliding guide 8151 and is located between the sliding member 8152 and one end of the linear sliding guide 8151.

[0092] One end of the linear sliding guide rail 8151 is provided with a through hole connected to the cylinder, and one end of the connecting shaft 8156 is configured to penetrate into the cylinder from the through hole and be connected to the sliding member 8152. The first buffer spring 8154 is configured to be sleeved on the outside of the connecting shaft 8156 in the cylinder.

[0093] The end portion of the connecting shaft 8156 located outside the cylinder of the linear sliding guide rail 8151 is rotatably connected to the other end of the first adjustment arm 311 .

[0094] In some embodiments, an annular mounting groove is formed in the cylinder of the linear sliding guide rail 8151 near the through-port, and a waterproof double-lip oil seal corresponding to the through-port is installed on the annular mounting groove.

[0095] In this embodiment, when the above-mentioned two lifting mechanisms and two lifting drive mechanisms are provided, the provision of the bidirectional buffer device 815 is also used to solve the problem of twisting, damage and suffocation caused by inconsistent speeds of the electric push rods when the left and right sides are lifted and lowered simultaneously.

[0096] like Figure 1 、 2 As shown, in some embodiments, in terms of the overall structure, walking components are provided on both the left and right sides of the frame 1, and the frame 1 is supported on the ground by a walking mechanism 7 so that there is a high movable space under the frame 1, and the chassis 2 is arranged in the high movable space and is connected to the frame through the above-mentioned lifting link mechanism.

[0097] Driven by the lifting drive assembly and guided by the linear lifting guide mechanism, the chassis 2 performs linear up and down movement adjustment accordingly.

[0098] In some embodiments, the cutter head drive assembly 6 includes a power part such as a motor or an internal combustion engine. The cutter head assembly 5 includes a blade, which is output and rotated by the cutter head drive assembly 6 to drive the blade to rotate, thereby forming a trimming action.

[0099] For example, the output shaft of the engine is connected to the blade to drive the blade to rotate, or the output shaft of the engine is connected to the blade power through a gearbox to drive the blade to rotate, or the output shaft of the engine is connected to a cutter head for mounting the blade to drive the blade to rotate, etc.

[0100] In some embodiments, the output shaft of the engine is vertically arranged, extending downward and connected to a cutter disc, and the blade is connected to the cutter disc. When the engine is working, the blade on the cutter disc is driven to rotate to perform cutting and trimming operations.

[0101] like Figure 3 、 4As shown in Figures 5 and 5, in some embodiments, two linear lifting guide mechanisms are provided, and the two linear lifting guide mechanisms are respectively a first linear lifting guide mechanism 4a and a second linear lifting guide mechanism 4b.

[0102] The linear guide rail of the first linear lifting guide mechanism 4a is installed on the left side of the chassis 2, the opening of the linear guide rail of the first linear lifting guide mechanism 4a faces left, the guide sliding member of the first linear lifting guide mechanism 4a is arranged as a roller, and the guide sliding member of the first linear lifting guide mechanism 4a is rotatably connected to the left side of the frame.

[0103] The linear guide rail of the second linear lifting guide mechanism 4b is installed on the right side of the chassis 2, the opening of the linear guide rail of the second linear lifting guide mechanism 4b faces to the right, the guide sliding member of the second linear lifting guide mechanism 4b is arranged as a roller, and the guide sliding member of the second linear lifting guide mechanism 4b is rotatably connected to the right side of the frame 1.

[0104] The above setting provides a smooth guiding effect for vertical lifting, and the sliding is not easily stuck. The chassis has good static and dynamic impact resistance in the front, back, left and right directions.

[0105] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A lawn mower with adjustable cutter head height, characterized in that: It includes a frame, a chassis, a lifting mechanism, a linear lifting guide mechanism and a lifting drive mechanism; A cutter head assembly is provided on the chassis; The lifting mechanism includes a lifting link mechanism, and the lifting link mechanism includes a first adjusting arm and a second adjusting arm; An articulated seat is provided on the chassis, one end of the second adjusting arm is rotatably connected to the articulated seat of the chassis, and the other end of the second adjusting arm is rotatably connected to one end of the first adjusting arm; The first adjusting arm has a hinge portion, which is rotatably connected to the frame; The other end of the first adjustment arm is adapted to be driven by the lifting drive mechanism, and when the lifting drive mechanism drives the first adjustment arm so that the first adjustment arm rotates on the frame, the height of one end of the first adjustment arm changes accordingly; The linear lifting guide mechanism includes a linear guide rail and a guide slide slidably disposed on the linear guide rail. The connecting portion on the linear guide rail and the connecting portion on the guide slide correspond to two different connecting portions of the linear lifting guide mechanism. The first connecting portion of the linear lifting guide mechanism is connected to the chassis, and the second connecting portion of the linear lifting guide mechanism is connected to the frame. When the frame is in a horizontal setting, the linear guide rail is in a vertical guiding setting, and the height change path of the chassis is limited to a vertical path.

2. The lawn mower according to claim 1, wherein: The lifting link mechanism also includes a third adjusting arm and a fourth adjusting arm; On the first adjusting arm, the arm length portion from the hinge portion to one end of the first adjusting arm forms a first force arm; One end of the fourth adjusting arm is rotatably connected to the hinge seat of the chassis, the other end of the fourth adjusting arm is rotatably connected to one end of the third adjusting arm, and the other end of the third adjusting arm is rotatably connected to the hinge portion; The length of the third adjustment arm is the same as that of the first force arm, and the length of the fourth adjustment arm is the same as that of the second adjustment arm.

3. The lawn mower according to claim 1, wherein: The lifting mechanism includes two lifting link mechanisms, which are spaced apart along the rotation radial direction of the hinge portion, and the two lifting link mechanisms are respectively a first lifting link mechanism and a second lifting link mechanism; The lifting mechanism further includes a first connecting rod, one end of which is rotatably connected to the first adjusting arm of the first lifting link mechanism, and the other end of the first connecting rod is rotatably connected to the first adjusting arm of the second lifting link mechanism.

4. The lawn mower according to claim 3, characterized in that The rotation axis of the hinge portion corresponds to the left and right direction when the frame moves forward, and the first lifting link mechanism and the second lifting link mechanism are arranged with a front-to-back interval in the rotation radial direction corresponding to the front-to-back direction.

5. The lawn mower according to claim 1, wherein There are two lifting mechanisms, which are spaced apart along the rotation axis of the hinge portion, and the two lifting mechanisms are respectively a first lifting mechanism and a second lifting mechanism; There are two lifting drive mechanisms, which act on the first lifting mechanism and the second lifting mechanism respectively.

6. The lawn mower according to claim 5, characterized in that The rotation axis of the hinge portion corresponds to the left and right direction when the frame moves forward, and the first lifting mechanism and the second lifting mechanism are arranged at intervals on the left and right.

7. The lawn mower according to claim 1, wherein: There are two linear lifting guide mechanisms, which are a first linear lifting guide mechanism and a second linear lifting guide mechanism; The linear guide rail of the first linear lifting guide mechanism is installed on the left side of the chassis, the opening of the linear guide rail of the first linear lifting guide mechanism faces left, the guide sliding member of the first linear lifting guide mechanism is arranged in the form of a roller, and the guide sliding member of the first linear lifting guide mechanism is rotatably connected to the left side of the frame; The linear guide rail of the second linear lifting guide mechanism is installed on the right side of the chassis, the opening of the linear guide rail of the second linear lifting guide mechanism faces right, the guide sliding member of the second linear lifting guide mechanism is arranged as a roller, and the guide sliding member of the second linear lifting guide mechanism is rotatably connected to the right side of the frame.

8. The lawn mower according to claim 1, wherein The hinge portion is located on the first adjustment arm between one end of the first adjustment arm and the other end of the first adjustment arm; On the first adjusting arm, the arm length portion from the hinge portion to one end of the first adjusting arm forms a first force arm; The arm length portion from the hinge portion to the other end of the first adjusting arm forms a second lever arm, and the length of the second lever arm is greater than the length of the first lever arm.

9. The lawn mower according to claim 1, wherein The lifting drive mechanism includes a linear drive assembly, which includes a driving body and a moving part driven by the driving body to move linearly, and the mounting portion on the driving body and the mounting portion on the moving part correspond to two different mounting parts constituting the linear drive assembly; When the driving body drives the moving part to move linearly, the distance between the two mounting parts changes; The first mounting portion of the linear drive assembly is rotatably connected to the frame, and the second mounting portion of the linear drive assembly is rotatably connected to the other end of the first regulating arm.

10. The lawn mower according to claim 9, characterized in that The linear drive assembly includes an electric push rod, the cylinder body of the electric push rod and the piston rod of the electric push rod are the driving body and the moving part respectively.

11. The lawn mower according to claim 9 or 10, characterized in that The second mounting portion is provided with a bidirectional buffer device, and the second mounting portion is rotatably connected to the other end of the first adjusting arm through the bidirectional buffer device; The moving component of the linear drive assembly is driven to move along a straight line and has a first moving direction in the straight line that increases the distance between the first mounting portion and the second mounting portion, and a second moving direction opposite to the first moving direction. The bidirectional buffer device is configured to perform buffering along a first moving direction and to perform buffering along a second moving direction.

12. The lawn mower according to claim 11, characterized in that The bidirectional buffer device includes a linear sliding guide rail and a sliding member slidably arranged on the linear sliding guide rail, wherein the sliding member has a resisting portion; A first buffer spring and a second buffer spring are provided on the linear sliding guide rail, and the linear movement direction of the sliding member on the linear sliding guide rail is the same as the linear movement direction of the moving part of the linear drive assembly when driven by the driving body; When the sliding member slides along the first moving direction, the resisting portion and the linear sliding guide rail jointly press the first buffer spring; when the sliding member slides along the second moving direction, the resisting portion and the linear sliding guide rail jointly press the second buffer spring; A connecting shaft is connected to the sliding member, and the connecting part on the connecting shaft and the connecting part on the linear sliding guide rail constitute two different connecting parts of the bidirectional buffer device. The first connecting part is connected to the second mounting part, and the second connecting part is rotatably connected to the other end of the first adjusting arm.

13. The lawn mower according to claim 12, characterized in that When the linear drive assembly includes an electric push rod, The linear sliding guide is arranged in a cylindrical shape, and one end of the linear sliding guide is connected to the outer end of the piston rod; The sliding member is slidably arranged in the cylinder of the linear sliding guide rail, and the first buffer spring and the second buffer spring are spiral compression springs. The first buffer spring is arranged in the cylinder of the linear sliding guide rail and is located between the sliding member and the other end of the linear sliding guide rail, and the second buffer spring is arranged in the cylinder of the linear sliding guide rail and is located between the sliding member and one end of the linear sliding guide rail. One end of the linear sliding guide rail is provided with a through opening communicating with the cylinder, one end of the connecting shaft is configured to penetrate into the cylinder from the through opening and be connected to the sliding member, and the first buffer spring is configured to be sleeved on the outside of the connecting shaft in the cylinder. The end portion of the connecting shaft located outside the cylinder of the linear sliding guide rail is rotatably connected to the other end of the first regulating arm.

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