Middle mower lifting mechanism, middle mower and tractor

Abstract

The utility model relates to a middle mower lifting mechanism, a middle mower and a tractor, the middle mower lifting mechanism comprises a front hitching assembly, a torsion spring, at least two middle hitching assemblies and a rear hitching assembly, one end of the torsion spring is fixed at the rear end of the front hitching assembly, and the rear end of the rear hitching assembly is used for being in transmission connection with the tractor. The rear end of the front hitching assembly is used for being rotationally connected to the front end of a mower assembly, the other end of the torsional spring is used for being fixedly connected to the front end of the mower assembly, and the middle hitching assembly comprises a seat plate with the upper end used for being fixedly connected to a tractor and a lifting plate with the front end rotationally connected to the lower end of the seat plate. The rear end of each lifting plate is used for being detachably connected to the rear end of a mower assembly, the front end of the rear hooking assembly is rotationally connected to the multiple lifting plates at the same time, and the rotating connecting point is located in front of the detachable connecting point of the rear ends of the lifting plates and the mower assembly. According to the utility model, the middle mower can be relatively kept in a balanced state after being lifted.

Description

Technical Field

[0001] The utility model relates to the technical field of lawn maintenance equipment, in particular to a mid-mounted lawn mower lifting mechanism, a mid-mounted lawn mower and a tractor. Background Art

[0002] Small horsepower tractors have a good performance in garden mowing operations and are widely used. As one of the mowing equipment, the mower placed in the middle of the tractor is a non-standard interface machine. During use, the mower in the middle of the tractor needs to be lifted to a certain height to facilitate the movement of the tractor. However, in the prior art, the mower cannot maintain balance after being lifted, which affects the driving of the tractor and has a poor use effect. Utility Model Content

[0003] The utility model provides a lifting mechanism for a center-mounted lawn mower, a center-mounted lawn mower and a tractor, which can ensure that the center-mounted lawn mower maintains a relatively balanced state after being lifted.

[0004] The technical solution of the utility model to solve the above technical problems is as follows:

[0005] In the first aspect, the utility model provides a mid-mounted lawn mower lifting mechanism, comprising a front end for fixedly connecting to a front hitch assembly of a tractor, a torsion spring with one end fixed to the rear end of the front hitch assembly, at least two middle hitch assemblies, and a rear end for transmission connection to a lifter assembly of the tractor, the rear end of the front hitch assembly being used for rotationally connecting to the front end of the lawn mower assembly, the other end of the torsion spring being used for fixedly connecting to the front end of the lawn mower assembly, the middle hitch assembly comprising an upper end for fixedly connecting to a seat plate of the tractor and a lifting plate with a front end rotationally connected to the lower end of the seat plate, the rear end of each lifting plate being used for detachably connecting to the rear end of the lawn mower assembly, the front end of the rear hitch assembly being rotationally connected to a plurality of lifting plates at the same time, and the rotation connection point being located in front of the detachable connection point between the rear end of the lifting plate and the lawn mower assembly.

[0006] The beneficial effect of the utility model is that when the lawn mower assembly under the tractor is lifted, the lifter assembly of the tractor is used to apply lifting power to the rear hitch assembly, so that the lifting plate rotates around the rotation axis between it and the seat plate, driving the rear end of the lawn mower assembly to be lifted upward, and at the same time, under the action of the front hitch assembly and the torsion spring, the reaction force of the torsion spring is used to lift the front end of the lawn mower assembly upward, completing the lifting of the entire lawn mower assembly, thereby ensuring that the lawn mower assembly remains in a relatively balanced state after being lifted.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the rear hitch assembly includes a lifting rocker arm whose rear end is used for transmission connection to the tractor's lift assembly, a connecting rod assembly whose rear end is detachably connected to the front end of the lifting rocker arm, a lifting shaft for rotationally connected to the tractor, and at least two transmission units fixedly connected to the lifting shaft, the number of the transmission units is equal to the number of the lifting plates and are arranged in a one-to-one correspondence, the rear end of one of the transmission units is rotated to the front end of the connecting rod assembly, and the front end of the transmission unit is rotationally connected to the corresponding lifting plate.

[0009] The beneficial effect of adopting the above further scheme is: the tractor's lifter assembly is used to apply lifting power to the rear hitch assembly, so that the lifting plate rotates around the rotation axis between it and the seat plate, and drives the rear end of the lawn mower assembly to be lifted upward. The tractor's lifter assembly applies power to the lifting rocker arm, and the power is transmitted by the connecting rod assembly. The transmission unit rotates around the lifting shaft, so that the lifting plate rotates around the rotation axis between it and the seat plate through the transmission unit, and drives the rear end of the lawn mower assembly to be lifted upward.

[0010] Furthermore, the lifting rocker arm includes a rocker at the rear end for transmission connection to the lifter assembly of the tractor and an eccentric shaft with one end rotatably connected to the front end of the rocker, and the other end of the eccentric shaft is detachably connected to the rear end of the connecting rod assembly.

[0011] The beneficial effect of adopting the above further scheme is that the lifter assembly of the tractor applies power to the rocker, causing the rocker to rotate, driving the eccentric shaft to rotate, causing the rear end of the connecting rod assembly to move in the vertical direction to be transmitted to the transmission unit, so that the lifting plate rotates around the rotation axis between it and the seat plate.

[0012] Furthermore, the connecting rod assembly includes a short pull rod whose rear end is detachably connected to the front end of the lifting rocker arm, a short rocker arm whose rear end is rotatably connected to the front end of the short pull rod, a rotating shaft whose rear end is fixedly connected to the front end of the short rocker arm, a long rocker arm whose rear end is fixedly connected to the front end of the rotating shaft, and a long pull rod whose rear end is rotatably connected to the front end of the long rocker arm, the rotating shaft is used to be rotatably installed on the tractor, and the front end of the long pull rod is rotated on the rear end of one of the transmission units.

[0013] The beneficial effect of adopting the above further scheme is: when lifting, the short pull rod moves upward, the rotating shaft rotates, the short rocker arm and the long rocker arm rotate around the centerline axis of the rotating shaft at the same time, pulling the long pull rod, so that the transmission unit rotates around the lifting shaft, thereby realizing the rotation of the lifting plate around the rotation axis between it and the seat plate.

[0014] Furthermore, the transmission unit includes at least two rocker arms and at least two pull rods which are arranged in a one-to-one correspondence on each of the rocker arms. The number of the rocker arms is equal to the number of the lifting plates and are arranged in a one-to-one correspondence. The rear end of one of the rocker arms is rotated on the front end of the connecting rod assembly. Each of the rocker arms is fixedly connected to the lifting shaft, the rear end of the pull rod is rotatably connected to the front end of the rocker arm, and the front end of the pull rod is rotatably connected to the lifting plate.

[0015] The beneficial effect of adopting the above further scheme is: when the lifting plate is rotated around the rotation axis between it and the seat plate by using the transmission unit, the rocker arm and the lifting shaft simultaneously rotate around the lifting shaft as the central axis, so that the pull rod drives the lifting plate to rotate around the rotation axis between it and the seat plate, and the rear end of the lawn mower assembly is lifted upward.

[0016] Furthermore, two ends of the rocker arm form an acute angle, and the lifting shaft is located at the angle.

[0017] The beneficial effect of adopting the above further solution is that the rocker arm can rotate smoothly around the central axis of the lifting shaft by pulling the connecting rod assembly.

[0018] Furthermore, the rear end of the front hitch assembly is rotatably connected to a mounting shaft for fixedly connecting to the front end of the lawn mower assembly, and the other end of the torsion spring is sleeved and fixedly connected to the mounting shaft.

[0019] The beneficial effect of adopting the above further scheme is that when the rear end of the lawn mower assembly is lifted upward, the torsion spring generates torque, so that the front end of the lawn mower assembly is lifted upward, completing the lifting of the entire lawn mower assembly, thereby ensuring that the lawn mower assembly remains relatively balanced after being lifted.

[0020] Furthermore, along the front-to-back direction, the connection point between the front hitch assembly and the lawn mower assembly is located directly in front of the midpoints of at least two of the middle hitch assemblies.

[0021] The beneficial effect of adopting the above further solution is to ensure that the lawn mower assembly remains balanced during the process of lifting the lawn mower assembly.

[0022] In a second aspect, the utility model provides a mid-mounted lawn mower, comprising the aforementioned mid-mounted lawn mower lifting mechanism.

[0023] In a third aspect, the utility model provides a tractor, comprising the above-mentioned mid-mounted lawn mower. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is an axonometric drawing of the utility model;

[0025] Figure 2 for Figure 1 A first partial structural schematic diagram of;

[0026] Figure 3 for Figure 1 A second partial structural schematic diagram of;

[0027] Figure 4 for Figure 2 Enlarged view of part A in the middle;

[0028] Figure 5 for Figure 3 Enlarged view of middle part B;

[0029] Figure 6 for Figure 1 A schematic diagram of a third partial structure;

[0030] Figure 7 for Figure 6 Enlarged view of part C in the middle.

[0031] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0032] 1. Lifter assembly;

[0033] 2. Lawn mower assembly;

[0034] 3. Front hitch assembly; 31. Hook assembly; 32. Front hitch assembly; 33. Mounting shaft;

[0035] 4. Torsion spring;

[0036] 5. Middle hitch assembly; 51. Seat plate; 52. Lifting plate; 53. Center shaft; 54. Limiting plate;

[0037] 6. Rear hitch assembly; 61. Lifting rocker arm; 611. Rocker; 612. Eccentric shaft; 613. Fixing block; 614. Bolt; 615. Fixed outer pin; 62. Connecting rod assembly; 621. Short pull rod; 6211. Nut; 6212. Spacer; 622. Short rocker arm; 623. Transfer shaft; 624. Long rocker arm; 625. Long pull rod; 63. Lifting shaft; 64. Transmission unit; 641. Rocker arm; 642. Pull rod; 6421. Clamp; 6422. Pull rope. DETAILED DESCRIPTION

[0038] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0039] It should be noted that if Figure 1The lawn mower assembly 2 is a shell structure with a downward opening, a cutting knife is arranged in the lower opening, and a power transmission component (such as a transmission box) is installed on the upper side thereof, the shaft head of the power transmission component is transmission-connected with the spline sleeve of the universal joint transmission shaft, the universal joint transmission shaft is transmission-connected with the power output assembly of the tractor, and the output end of the power transmission component is transmission-connected to the cutting knife, so that the universal joint transmission shaft is controlled by the tractor, and the cutting knife is driven to rotate through the transmission of the transmission box to complete the mowing operation.

[0040] Furthermore, a plurality of rollers are fixed to the lower end of the shell of the lawn mower assembly 2 to facilitate moving operations.

[0041] When the mower assembly 2 is used as a mid-mounted mower in combination with a tractor, the mower assembly 2 is placed on a horizontal ground, and the tractor drives onto the mower assembly 2 from the rear through the upper plate (not marked in the figure) on the mower assembly 2, until the front wheels pass through and drive off the mower assembly 2. After driving off, the left and right hooks on the mower assembly 2 are automatically connected with the automatic connection mechanism, and at the same time, the shaft head of the transmission box of the mower assembly 2 is simultaneously connected to the front spline sleeve of the universal joint transmission shaft to complete the automatic connection. After that, the mower assembly 2 can be lifted by the tractor's lifter assembly 1, so that the mower assembly 2 is off the ground, so that the tractor can drive to the mowing destination.

[0042] It should be noted that the present invention only describes how to lift a mid-mounted lawn mower. Other operations, such as how to couple the lawn mower assembly 2 to a tractor, are not described in detail and are not the focus of protection of the present invention.

[0043] The utility model is described in detail below.

[0044] On the one hand, the utility model provides a lifting mechanism for a mid-mounted lawn mower, as described in detail below.

[0045] Example 1

[0046] like Figures 1 to 7A mid-mounted lawn mower lifting mechanism comprises a front end for fixedly connecting to a tractor a front hitch assembly 3, a torsion spring 4 having one end fixed to the rear end of the front hitch assembly 3, at least two middle hitch assemblies 5, and a rear end for transmission connection to a lifter assembly 1 of the tractor, the rear end of the front hitch assembly 3 being used for rotationally connecting to the front end of the lawn mower assembly 2, the other end of the torsion spring 4 being used for fixedly connecting to the front end of the lawn mower assembly 2, the middle hitch assembly 5 comprising an upper end for fixedly connecting to a seat plate 51 of the tractor and a lifting plate 52 having a front end rotationally connected to the lower end of the seat plate 51, the rear end of each lifting plate 52 being used for detachably connecting to the rear end of the lawn mower assembly 2, the front end of the rear hitch assembly 6 being rotationally connected to a plurality of lifting plates 52 at the same time, the rotation connection point being located in front of the rear end of the lifting plate 52 and the detachable connection point of the lawn mower assembly 2.

[0047] The beneficial effect of this embodiment is that when the lawn mower assembly 2 under the tractor is lifted, the lifter assembly 1 of the tractor is used to apply lifting power to the rear hitch assembly 6, so that the lifting plate 52 rotates around the rotation axis between it and the seat plate 51, driving the rear end of the lawn mower assembly 2 to lift upward, and at the same time, under the action of the front hitch assembly 3 and the torsion spring 4, the reaction force of the torsion spring 4 is used to lift the front end of the lawn mower assembly 2 upward, completing the lifting of the entire lawn mower assembly 2, thereby ensuring that the lawn mower assembly 2 remains relatively balanced after being lifted.

[0048] The term “front end” is used in Figure 1 The left side is the front, and the “back end” is Figure 1 The right side is the rear, and the components are connected from left to right in sequence to form the "front end" and "rear end" in the above terms. Further explanation: when the tractor travels above the mower assembly 2 to complete the docking action, it drives from the rear to the front in the direction shown in the figure.

[0049] The rear hitch assembly 6 is specifically connected to the left lifting arm of the lifter assembly 1 by transmission.

[0050] As a specific solution of the above embodiment, the front hitch assembly 3 includes a vertically arranged hook assembly 31 and a horizontally arranged front hitch assembly 32. The front end ( Figure 1 The upper end is shown in the figure) and is used to be fixed to the belly of the tractor by bolts, while the rear end of the hook assembly 31 ( Figure 1 The front end of the front hook assembly 32 is bent upward to form a rod shape to be hooked to the hook of the hook assembly 31. The rear end of the front hook assembly 32 extends horizontally backward to form two rods, and the two rods are used to be rotatably connected to the front end of the mower assembly 2. When hooking, the tractor moves forward, and the hook assembly 31 fixed to the tractor completes the hooking of the front hook assembly 32.

[0051] Based on the above embodiment, the at least two middle hitch assemblies 5 may be two, three, four, etc., and only two are shown in the figure, and are arranged perpendicular to Figure 1 Directional interval distribution in the middle and front-back direction.

[0052] The upper end of the seat plate 51 is fixed by bolts ( Figure 1 , Figure 3 The upper and lower ones are shown in the figure) and are fixedly connected to the tractor, specifically to the rear axle housing of the tractor's gearbox.

[0053] Based on the above embodiment, the lower end of the seat plate 51 is rotatably connected to the central shaft 53, and the central shaft 53 includes a bolt and a sleeve sleeved on the bolt rod. The bolt and the sleeve are simultaneously passed through the lower end of the seat plate 51 and the front end of the lifting plate 52 to complete the connection between the seat plate 51 and the lifting plate 52, and the lifting plate 52 can be rotated relative to the seat plate 51 with the central shaft 53 as the center axis.

[0054] Based on the above embodiment, each lifting plate 52 has a gap with the top of the lawn mower assembly 2 to prevent the two from colliding.

[0055] A limiting plate 54 is provided below the front end of each lifting plate 52 for fixing to the upper side of the front end of the lawn mower assembly 2, and the upper end of the limiting plate 54 faces the lifting plate 52 to form a limit between the lifting plate 52 and the lawn mower assembly 2 to prevent the two from colliding.

[0056] Example 2

[0057] like Figure 1 , Figure 3 , Figure 6 as well as Figure 7 On the basis of Example 1, the rear hitch assembly 6 includes a lifting rocker arm 61 at the rear end for transmission connection to the lifter assembly 1 of the tractor, a connecting rod assembly 62 at the rear end detachably connected to the front end of the lifting rocker arm 61, a lifting shaft 63 for rotation connection to the tractor, and at least two transmission units 64 fixedly connected to the lifting shaft 63, the number of transmission units 64 is equal to the number of lifting plates 52 and is arranged one by one, the rear end of one transmission unit 64 is rotated to the front end of the connecting rod assembly 62, and the front end of the transmission unit 64 is rotationally connected to the corresponding lifting plate 52.

[0058] The beneficial effect of adopting the preferred scheme in the above embodiment is that the lifting power is applied to the rear hitch assembly 6 by using the lifter assembly 1 of the tractor, so that the lifting plate 52 rotates around the rotation axis between it and the seat plate 51, and the rear end of the lawn mower assembly 2 is driven to lift upward. The lifter assembly 1 of the tractor applies power to the lifting rocker arm 61, and the power is transmitted by the connecting rod assembly 62. The transmission unit 64 and the lifting shaft 63 rotate at the same time with the central axis of the lifting shaft 63 as the axis, so that the lifting plate 52 rotates around the rotation axis between it and the seat plate 51 through the transmission unit 64, and the rear end of the lawn mower assembly 2 is driven to lift upward.

[0059] Example 3

[0060] like Figure 6 and Figure 7 On the basis of embodiments 1 and 2, the lifting rocker arm 61 includes a rocker 611 at the rear end for transmission connection to the lifter assembly 1 of the tractor and an eccentric shaft 612 with one end rotatably connected to the front end of the rocker 611, and the other end of the eccentric shaft 612 is detachably connected to the rear end of the connecting rod assembly 62.

[0061] The beneficial effect of adopting the preferred scheme in the above embodiment is that the lifter assembly 1 of the tractor applies power to the rocker 611, causing the rocker 611 to rotate, driving the eccentric shaft 612 to rotate, causing the rear end of the connecting rod assembly 62 to move in the vertical direction to be transmitted to the transmission unit 64, so that the lifting plate 52 rotates around the rotation axis between it and the seat plate 51.

[0062] The rotation axes of the rocker 611 and the eccentric shaft 612 do not coincide, one end of the eccentric shaft 612 passes through a hole reserved at the end of the rocker 611 , and a nut is threadedly connected to the end to achieve the connection between the rocker 611 and the eccentric shaft 612 .

[0063] On the basis of the above embodiment, the lifting rocker arm 61 further includes a fixing block 613 , and the rocker rod 611 is rotatably connected to the outer side of the fixing block 613 .

[0064] As one of the specific solutions of the above embodiment, the fixing block 613 is welded to or integrally formed on the left lifting arm of the lifter assembly 1 to form an integral structure, thereby eliminating the installation steps.

[0065] As a second specific solution of the above embodiment, the fixing block 613 is detachably connected to the left lifting arm of the lifter assembly 1 through a bolt 614 and / or a fixed outer pin 615, so as to reduce the cost of the user who does not install the lawn mower assembly 2 and improve the market share. Among them, two bolts 614 are arranged at intervals.

[0066] Example 4

[0067] like Figure 6 and Figure 7On the basis of Examples 1-3, the connecting rod assembly 62 includes a short pull rod 621 whose rear end is detachably connected to the front end of the lifting rocker arm 61, a short rocker arm 622 whose rear end is rotatably connected to the front end of the short pull rod 621, a rotating shaft 623 whose rear end is fixedly connected to the front end of the short rocker arm 622, a long rocker arm 624 whose rear end is fixedly connected to the front end of the rotating shaft 623, and a long pull rod 625 whose rear end is rotatably connected to the front end of the long rocker arm 624. The rotating shaft 623 is used for rotatably installing on the tractor, and the front end of the long pull rod 625 is rotated at the rear end of one of the transmission units 64.

[0068] The beneficial effect of adopting the preferred scheme in the above embodiment is that, when lifting, the short pull rod 621 moves upward, the rotating shaft 623 rotates, the short rocker arm 622 and the long rocker arm 624 rotate around the center axis of the rotating shaft 623 at the same time, pulling the long pull rod 625, causing the transmission unit 64 to rotate, thereby realizing the rotation of the lifting plate 52 around the rotation axis between it and the seat plate 51.

[0069] Based on the above embodiment, the rear end of the short pull rod 621 is provided with an external thread, and the front end of the eccentric shaft 612 is provided with a through hole. The rear end of the short pull rod 621 passes through the through hole and is threadedly connected with multiple nuts 6211. A spacer sleeve 6212 is also provided between the nut 6211 close to the eccentric shaft 612 and the eccentric shaft 612 to limit the use length of the short pull rod 621 by the screwing length of the nut 6211, and to reduce friction by using the spacer sleeve 6212.

[0070] In the above embodiment, the lengths of the eccentric shaft 612 and the short rocker arm 622 are equal, which may be 33 mm; and the length of the long rocker arm 624 may be 58 mm.

[0071] Based on the above embodiment, a U-shaped clamp is provided at the rear end of the long pull rod 625, and a rotating shaft is provided at the open end of the U-shaped clamp, which is rotatably connected to the front end of the long rocker arm 624 (shown as the lower end of the long rocker arm 624 in the figure).

[0072] A U-shaped clamp is also provided at the front end of the long pull rod 625, and a rotating shaft is provided at the open end of the U-shaped clamp, which is rotatably connected to the long pull rod 625, and a T-shaped shaft is fixed to the rear end of one of the transmission units 64, and the T-shaped shaft rotates and slides in the U-shaped clamp.

[0073] Specifically, during lifting, the rocker arm 611 drives the eccentric shaft 612 to rotate counterclockwise, the short pull rod 621 moves upward, the short rocker arm 622 and the long rocker arm 624 rotate counterclockwise around the center axis of the rotating shaft 623 at the same time, and the counterclockwise rotating long rocker arm 624 pulls the long pull rod 625 to move relatively backward and upward, and the long pull rod 625 pulls the transmission unit 64 to rotate.

[0074] Example 5

[0075] like Figure 1 , Figure 5 as well as Figure 6 On the basis of Examples 1-4, the transmission unit 64 includes at least two rocker arms 641 and at least two pull rods 642 which are arranged one-to-one on each rocker arm 641. The number of rocker arms 641 is equal to the number of lifting plates 52 and is arranged one-to-one. The rear end of one rocker arm 641 is rotated on the front end of the connecting rod assembly 62, and each rocker arm 641 is fixedly connected to the lifting shaft 63. The rear end of the pull rod 642 is rotatably connected to the front end of the rocker arm 641, and the front end of the pull rod 642 is rotatably connected to the lifting plate 52.

[0076] The beneficial effect of adopting the preferred scheme in the above embodiment is that when the lifting plate 52 is rotated around the rotation axis between it and the seat plate 51 by utilizing the transmission unit 64, the rocker arm 641 and the lifting shaft 63 simultaneously rotate around the central axis of the lifting shaft 63, so that the pull rod 642 drives the lifting plate 52 to rotate around the rotation axis between it and the seat plate 51, and the rear end of the lawn mower assembly 2 is lifted upward.

[0077] As a specific solution of the above embodiment, two rocker arms 641 and two pull rods 642 are provided, and the rear end of one of the rocker arms 641 is rotated and slidably connected to the U-shaped clip at the front end of the long pull rod 625 through a T-shaped shaft.

[0078] The middle end of the rocker arm 641 is sleeved on the rod end of the lifting shaft 63 and is limited by a latch to keep the rocker arm 641 and the lifting shaft 63 relatively still.

[0079] Based on the above embodiment, the pull rod 642 includes two splints 6421 and a pull rope 6422. One ends of the two splints 6421 are simultaneously rotatably connected to the front end of the rocker arm 641 and are limited by a pin; the upper end of the pull rope 6422 is wrapped around and fixed to the rotating shaft at the other end of the two splints 6421, and the lower end of the pull rope 6422 is rotatably connected to the lifting plate 52. Specifically, the lifting plate 52 is rotatably connected to a rotating part, and the lower end of the pull rope 6422 is fixedly connected to one end of the rotating part.

[0080] The height of the rear end of the lifting plate 52 can be adjusted by adjusting the length of the pull rope 6422 . Under the joint action of the limit plate 54 , the limit plate 54 can be used as a scale for leveling the lifting plate 52 , thereby ensuring the overall horizontality of the lifting plate 52 .

[0081] Example 6

[0082] like Figure 1 , Figure 5 as well as Figure 6 On the basis of Embodiments 1-5, the two ends of the rocker arm 641 form an acute angle, and the lifting shaft 63 is located at the angle.

[0083] The beneficial effect of the preferred solution in the above embodiment is that the rocker arm 641 and the lifting shaft 63 can be smoothly rotated with the central axis of the lifting shaft 63 as the axis by pulling the connecting rod assembly 62. In the figure, when the long rocker arm 624 rotating counterclockwise pulls the long pull rod 625 to move relatively backward and upward, the long pull rod 625 pulls the rocker arm 641 to rotate counterclockwise.

[0084] Specifically, a sleeve is fixed at the angle of the rocker arm 641, and the two ends of the lifting shaft 63 extend into the two sleeves respectively, and are fixed to the sleeves by pins at the same time, so as to realize the fixed connection between the rocker arm 641 and the lifting shaft 63.

[0085] Example 7

[0086] like Figure 1 and Figure 2 On the basis of embodiments 1-6, the rear end of the front hitch assembly 3 is rotatably connected to a mounting shaft 33 for fixedly connecting to the front end of the lawn mower assembly 2, and the other end of the torsion spring 4 is sleeved and fixedly connected to the mounting shaft 33.

[0087] The beneficial effect of adopting the preferred scheme in the above embodiment is that when the rear end of the lawn mower assembly 2 is lifted upward, the torsion spring 4 generates torque, so that the front end of the lawn mower assembly 2 is lifted upward, completing the lifting of the entire lawn mower assembly 2, thereby ensuring that the lawn mower assembly 2 remains relatively balanced after being lifted.

[0088] Specifically, the rear end of the front hanging assembly 32 extends horizontally backward to form two rod portions, and the two rod portions are rotatably connected to the two ends of the installation shaft 33 respectively.

[0089] When the rear end of the lawn mower assembly 2 moves upward, the angle between the lawn mower assembly 2 and the horizontal front hitch assembly 32 changes from a straight angle to an obtuse angle, and the torsion spring 4 generates a torsion force to make the lawn mower assembly 2 horizontal.

[0090] Example 8

[0091] like Figure 1 On the basis of embodiments 1-7, along the front-to-back direction, the connection point between the front hitch assembly 3 and the lawn mower assembly 2 is located directly in front of the midpoints of at least two middle hitch assemblies 5.

[0092] The beneficial effect of adopting the preferred solution in the above embodiment is to ensure that the lawn mower assembly 2 remains balanced during the process of lifting the lawn mower assembly 2.

[0093] Specifically, Figure 1 The connection point between the front hitch assembly 3 and the lawn mower assembly 2 is located at the midpoint of the two middle hitch assemblies 5.

[0094] Example 9

[0095] In a second aspect, the utility model further provides a mid-mounted lawn mower, including a mid-mounted lawn mower lifting mechanism as described in embodiments 1 to 8. To use this lawn mower, a user only needs to purchase a lawn mower assembly 2 containing the mid-mounted lawn mower lifting mechanism and install the mid-mounted lawn mower lifting mechanism on his own tractor, thereby reducing the use cost.

[0096] Example 10

[0097] In a third aspect, the utility model also provides a mid-mounted tractor, including a lawn mower as described in Example 9.

[0098] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0099] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0100] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" 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, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0101] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0102] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0103] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A lifting mechanism for a mid-mounted lawn mower, characterized in that: The utility model comprises a front hitch assembly (3) having a front end for fixedly connecting to a tractor, a torsion spring (4) having one end fixed to the rear end of the front hitch assembly (3), at least two middle hitch assemblies (5), and a rear hitch assembly (6) having a rear end for transmission connection to a lifter assembly (1) of the tractor, wherein the rear end of the front hitch assembly (3) is used for rotationally connecting to the front end of a lawn mower assembly (2), the other end of the torsion spring (4) is used for fixedly connecting to the front end of the lawn mower assembly (2), the middle hitch assembly (5) comprises an upper end for fixedly connecting to a seat plate (51) of the tractor and a lifting plate (52) having a front end rotationally connected to the lower end of the seat plate (51), the rear end of each lifting plate (52) being used for detachably connecting to the rear end of the lawn mower assembly (2), the front end of the rear hitch assembly (6) being rotationally connected to a plurality of lifting plates (52) at the same time, and the rotation connection point is located in front of the detachable connection point between the rear end of the lifting plate (52) and the lawn mower assembly (2).

2. A lifting mechanism for a mid-mounted lawn mower according to claim 1, characterized in that: The rear hitch assembly (6) comprises a lifting rocker arm (61) at the rear end for transmission connection to the lifting device assembly (1) of the tractor, a connecting rod assembly (62) at the rear end detachably connected to the front end of the lifting rocker arm (61), a lifting shaft (63) for rotationally connecting to the tractor, and at least two transmission units (64) fixedly connected to the lifting shaft (63), the number of the transmission units (64) being equal to the number of the lifting plates (52) and being arranged in one-to-one correspondence, the rear end of one of the transmission units (64) being rotationally connected to the front end of the connecting rod assembly (62), and the front end of the transmission unit (64) being rotationally connected to the corresponding lifting plate (52).

3. A lifting mechanism for a mid-mounted lawn mower according to claim 2, characterized in that: The lifting rocker arm (61) comprises a rocker (611) at the rear end for transmission connection to the lifter assembly (1) of the tractor and an eccentric shaft (612) with one end rotatably connected to the front end of the rocker (611), and the other end of the eccentric shaft (612) is detachably connected to the rear end of the connecting rod assembly (62).

4. A lifting mechanism for a mid-mounted lawn mower according to claim 2, characterized in that: The connecting rod assembly (62) includes a short pull rod (621) whose rear end is detachably connected to the front end of the lifting rocker arm (61), a short rocker arm (622) whose rear end is rotatably connected to the front end of the short pull rod (621), a central shaft (623) whose rear end is fixedly connected to the front end of the short rocker arm (622), a long rocker arm (624) whose rear end is fixedly connected to the front end of the central shaft (623), and a long pull rod (625) whose rear end is rotatably connected to the front end of the long rocker arm (624), wherein the central shaft (623) is used for being rotatably mounted on a tractor, and the front end of the long pull rod (625) is rotated at the rear end of one of the transmission units (64).

5. A lifting mechanism for a mid-mounted lawn mower according to claim 2, characterized in that: The transmission unit (64) includes at least two rocker arms (641) and at least two pull rods (642) which are arranged in a one-to-one correspondence on each of the rocker arms (641). The number of the rocker arms (641) is equal to the number of the lifting plates (52) and they are arranged in a one-to-one correspondence. The rear end of one of the rocker arms (641) is rotated on the front end of the connecting rod assembly (62). Each of the rocker arms (641) is fixedly connected to the lifting shaft (63). The rear end of the pull rod (642) is rotationally connected to the front end of the rocker arm (641), and the front end of the pull rod (642) is rotationally connected to the lifting plate (52).

6. A lifting mechanism for a mid-mounted lawn mower according to claim 5, characterized in that: The two ends of the rocker arm (641) form an acute angle, and the lifting shaft (63) is located at the angle.

7. A lifting mechanism for a mid-mounted lawn mower according to any one of claims 1 to 6, characterized in that: The rear end of the front hitch assembly (3) is rotatably connected to a mounting shaft (33) for fixedly connecting to the front end of the lawn mower assembly (2), and the other end of the torsion spring (4) is sleeved and fixedly connected to the mounting shaft (33).

8. A lifting mechanism for a mid-mounted lawn mower according to any one of claims 1 to 6, characterized in that: The connection point between the front hitch assembly (3) and the lawn mower assembly (2) is located directly in front of the midpoint of at least two of the middle hitch assemblies (5).

9. A mid-mounted lawn mower, characterized in that: It comprises a lifting mechanism for a mid-mounted lawn mower as described in any one of claims 1-8.

10. A tractor, characterized in that: It includes a mid-mounted lawn mower as claimed in claim 9.

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