Height adjusting mechanism of operation machine

Abstract

The utility model discloses an operation machine height adjusting mechanism, an operation machine comprises a machine body and a blade arranged on the machine body, the front end and the rear end of the machine body are respectively connected with a front wheel shaft and a rear wheel shaft in a rotating mode, and the height adjusting mechanism comprises a front wheel supporting piece, a rear wheel supporting piece, a connecting piece, a locking mechanism, a handle and an adjusting button. The front wheel supporting piece is fixedly connected with the front wheel shaft and used for supporting the front tire. The rear wheel supporting piece is fixedly connected with the rear axle and used for supporting a rear tire. The connecting piece is connected with the front wheel supporting piece and the rear wheel supporting piece at the same time so that the front wheel supporting piece and the rear wheel supporting piece can move in an interlocking mode, and the locking mechanism is used for limiting displacement of the connecting piece in the front-back direction. The handle is fixed on the machine body; the adjusting button can slide in the vertical direction, one end of the adjusting button is located in the handle and used for driving the positioning block to move, and the other end of the adjusting button is exposed outside the handle. The height adjusting mechanism of the operation machine is simple and reliable in structure and small in occupied space.

Description

Technical Field

[0001] The utility model relates to the technical field of garden tools, in particular to a height adjustment mechanism for a working machine. Background Art

[0002] A lawn mower or grass comber is a kind of equipment tool used to mow the lawn. Generally, household lawn mowers or grass combers are cart-type. Such lawn mowers or grass combers generally have a base with four wheels for movement on both sides of the base. A driving device is provided on the base to drive the wheels and blades, and a control push rod is provided on the upper part of the body. When in use, the power device is started to make the rotary cutter rotate quickly, and the user holds the push rod to push the lawn mower or grass comber forward. Sometimes, in order to control the height of the grass cut, we usually adjust the height adjustment mechanism of the lawn mower or grass comber to adjust the height of the blade.

[0003] The existing height adjustment structures are divided into simple structures where the front and rear axles are adjusted separately and linkage structures where the front and rear axles are connected by rods. Mid- to high-end products often use linkage structures, which either have movable adjustment handles that take up more space, or have complex rotatable or pressable adjustment structures. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a height adjustment mechanism for a working machine, which has a simple and reliable structure and occupies a small space.

[0005] The utility model is realized by the following technical solutions:

[0006] A height adjustment mechanism for a working machine, the working machine comprising a machine body and a blade arranged on the machine body, the front end and the rear end of the machine body are rotatably connected to a front wheel shaft and a rear wheel shaft respectively, and the height adjustment mechanism comprises:

[0007] A front wheel support member is swingably disposed at the front end of the machine body and fixedly connected to the front wheel axle, and is used to support the front tire;

[0008] A rear wheel support member is swingably disposed at the rear end of the machine body and fixedly connected to the rear wheel axle to support the rear tire;

[0009] A connecting member connected to the front wheel support member and the rear wheel support member at the same time, so that the front wheel support member and the rear wheel support member can move in an interlocking manner, and the connecting member can be displaced in the front-to-back direction and the up-and-down direction relative to the swinging of the front wheel support member and the rear wheel support member;

[0010] A locking mechanism, used to limit the displacement of the connecting member in the front-to-back direction; the locking mechanism comprises a positioning block, a first elastic member and a plurality of locking grooves, the plurality of locking grooves are arranged on the connecting member in sequence from front to back, the positioning block can move between a locking position and an unlocking position, one end of the first elastic member abuts against the positioning block to maintain the positioning block in the locking position, at which time, the positioning block is interlocked with one of the plurality of locking grooves;

[0011] A handle, fixed on the body;

[0012] An adjusting button, which can slide in the up-down direction, and one end of the adjusting button is located inside the handle to drive the positioning block to move, and the other end is exposed outside the handle;

[0013] When the height of the working machine needs to be adjusted, the user holds the handle and presses the adjustment button downward with the thumb, and the adjustment button moves downward and overcomes the elastic force of the first elastic member to push the positioning block from the locked position to the unlocked position. At this time, the user can pull up and / or press down the handle to adjust the blade on the machine body to the target height position;

[0014] When the blade on the machine body has been adjusted to the target height position, the adjustment button is released. At this time, the positioning block returns to the locking position from the unlocking position under the elastic force of the first elastic member.

[0015] Furthermore, the adjustment button includes a pressing portion and a driving portion, wherein the pressing portion is at least partially exposed on the outside of the handle, and one end of the driving portion can drive the positioning block to move, and the other end is fixedly connected to the pressing portion.

[0016] Furthermore, a first wedge-shaped surface is provided at one end of the driving portion, and a second wedge-shaped surface matched with the first wedge-shaped surface is provided on the positioning block. When the adjustment button moves downward, the first wedge-shaped surface and the second wedge-shaped surface slide relatively.

[0017] Furthermore, a positioning seat is fixed on the machine body, and the other end of the first elastic member abuts against the positioning seat, and the positioning seat is used to limit the movement direction of the positioning block.

[0018] Furthermore, the positioning seat is provided with an opening, and the positioning block at least partially passes through the opening and moves along the direction of the opening.

[0019] Furthermore, a sliding block is protrudingly provided on one side of the positioning block away from the locking groove, and the sliding block at least partially passes through the opening and moves along the direction of the opening.

[0020] Furthermore, a second elastic member is provided between the positioning seat and the driving part, one end of the second elastic member abuts against one end of the driving part, and the other end abuts against the positioning seat, for driving the adjustment button to reset.

[0021] Furthermore, the working machine height adjustment mechanism also includes a third elastic member, one end of the third elastic member is connected to the positioning seat, and the other end of the third elastic member is connected to the connecting member.

[0022] Furthermore, a hook piece is fixed to the position of the connecting member close to the rear tire, the other end of the third elastic member is matched with the hook piece, and the third elastic member is used to drive the positioning seat to reset.

[0023] Furthermore, the locking mechanism also includes a shift plate, the shift plate is fixed on the connecting member, and a plurality of the locking grooves are sequentially opened on the shift plate from front to back.

[0024] Furthermore, at least one locking block is protrudingly provided on one side of the positioning block close to the locking groove, and when the positioning block is located at the locking position, the locking block is at least partially received in the locking groove.

[0025] Further, the front wheel support member and the rear wheel support member each have a first end, a second end and a third end;

[0026] The front wheel axle is fixed to the first end, the front tire is fixedly connected to the second end via a front positioning rod, and one end of the connecting member is hinged to the third end;

[0027] The rear wheel axle is fixed to the first end, and the rear tire is fixedly connected to the second end via a rear positioning rod; the other end of the connecting member is hinged to the third end.

[0028] Furthermore, a first connecting rod is embedded in the front wheel support member, and a second connecting rod is embedded in the rear wheel support member. One end of the first connecting rod is fixedly connected to the front wheel axle, and the other end is fixedly connected to the front positioning rod; one end of the second connecting rod is fixedly connected to the rear wheel axle, and the other end is fixedly connected to the rear positioning rod.

[0029] Compared with the prior art, the advantages of the present invention are:

[0030] 1. Hold the handle and press the adjustment button downward. The adjustment button acts directly on the positioning block. The relative movement of the first wedge surface and the second wedge surface enables the positioning block to engage and separate from the shift plate. The force required to press the adjustment button is very small, and it can be done with one finger. The downward pressing force of the adjustment button is offset by the upward holding force of the handle, and will not cause the entire machine to move downward. The structure is simple and reliable, occupies little space, and is easy to operate.

[0031] 2. When the positioning block is separated from the shift plate, you can intuitively lift the machine by holding the handle, which saves effort. The movement direction of the machine is consistent with the direction of the operating force, and it is easy to grab. This overcomes the disadvantage of pressing the knob down while moving the entire machine upward during conventional height adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a structural schematic diagram of a working machine according to an embodiment of the utility model;

[0033] Figure 2 A schematic diagram of the partial structure of the working machine Figure 1 ;

[0034] Figure 3 A schematic diagram of the partial structure of the working machine Figure 2 ;

[0035] Figure 4 A schematic diagram of part of the height adjustment mechanism Figure 1 ;

[0036] Figure 5 A schematic diagram of part of the height adjustment mechanism Figure 2 ;

[0037] Figure 6 A schematic diagram of the partial structure of the working machine Figure 3 ;

[0038] Figure 7 A partial cross-sectional view of the working machine with the locking mechanism in a locked position;

[0039] Figure 8 It is a partial cross-sectional view of the working machine with the locking mechanism in the unlocked position.

[0040] 1. body; 2. front wheel axle; 20. front tire; 21. front positioning rod; 22. first connecting rod; 3. rear wheel axle; 30. rear tire; 31. rear positioning rod; 32. second connecting rod; 4. front wheel support; 40. first end; 41. second end; 42. third end; 5. rear wheel support; 50. first end; 51. second end; 52. third end; 6. connecting member; 60. hook member; 7. locking mechanism; 70. positioning block; 700. second wedge-shaped surface; 701. block; 702. slider; 71. first elastic member; 72. shift plate; 720. locking groove; 8. handle; 9. adjustment button; 90. pressing part; 91. driving part; 910. first wedge-shaped surface; 10. positioning seat; 100. opening; 11. second elastic member; 12. third elastic member. DETAILED DESCRIPTION

[0041] The following is a further non-restrictive detailed description of the utility model technical solution in conjunction with the preferred embodiment and its accompanying drawings. In the description of the utility model, 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 the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings. In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the utility model, and cannot be understood as limitations on the utility model.

[0042] like Figure 1-Figure 6 As shown, a height adjustment mechanism for a working machine according to an embodiment of the utility model is provided. The working machine is, for example, a lawn mower or a grass comber. In this embodiment, a lawn mower with a height adjustment mechanism is provided. The lawn mower comprises a machine body 1 and a blade (not shown) arranged on the machine body 1. The front end and the rear end of the machine body 1 are rotatably connected to a front wheel shaft 2 and a rear wheel shaft 3, respectively. The height adjustment mechanism comprises a front wheel support member 4, a rear wheel support member 5, a connecting member 6, a locking mechanism 7, a handle 8 and an adjustment button 9. The front wheel support member 4 is swingably arranged at the front end of the machine body 1 and is connected to the front wheel shaft 3. The shaft 2 is fixedly connected to support the front tire 20; the rear wheel support 5 is swingably arranged at the rear end of the body 1 and fixedly connected to the rear wheel shaft 3 to support the rear tire 30; the connecting member 6 is connected to the front wheel support 4 and the rear wheel support 5 at the same time, so that the front wheel support 4 and the rear wheel support 5 can move in an interlocking manner, and the connecting member 6 can be displaced in the front and rear directions and the up and down directions relative to the swinging of the front wheel support 4 and the rear wheel support 5; the locking mechanism 7 is used to limit the displacement of the connecting member 6 in the front and rear directions, and the handle 8 is fixed on the body 1 and is located in the middle position of the body 1.

[0043] The locking mechanism 7 includes a positioning block 70, a first elastic member 71 and a plurality of locking grooves 720. The plurality of locking grooves 720 are arranged on the connecting member 6 from front to back. The positioning block 70 can move between a locked position and an unlocked position. One end of the first elastic member 71 abuts against the positioning block 70 to maintain the positioning block 70 in the locked position. At this time, the positioning block 70 is interlocked with one of the plurality of locking grooves 720.

[0044] At least one block 701 is protruded from one side of the positioning block 70 near the locking groove 720. When the positioning block 70 is located at the locking position, the block 701 is at least partially received in the locking groove 720 to complete the locking. Figure 4 In this embodiment, three card blocks 701 are provided, and the three card blocks 701 are arranged in sequence and can be matched with a plurality of locking grooves 720 arranged in sequence on the connecting member 6 to improve the stability of the locking structure.

[0045] The locking mechanism 7 further includes a shift plate 72 , which is fixed on the connecting member 6 , and a plurality of locking grooves 720 are sequentially formed on the shift plate 72 from front to back.

[0046] The height adjustment mechanism also includes an adjustment button 9, which is set at a position that can be pressed when the handle 8 is held by hand. The adjustment button 9 can slide in the up and down direction, and one end of the adjustment button 9 is located inside the handle 8 to drive the positioning block 70 to move, and the other end is exposed on the outside of the handle 8; when it is necessary to adjust the height of the working machine, the user holds the handle 8 and presses the adjustment button 9 downward with the thumb, and the adjustment button 9 moves downward and overcomes the elastic force of the first elastic member 71 to push the positioning block 70 from the locked position to the unlocked position. At this time, the user can pull up and / or press down the handle 8 to adjust the blade on the machine body 1 to the target height position; when the blade on the machine body 1 has been adjusted to the target height position, release the adjustment button 9, and at this time, the positioning block 70 returns from the unlocked position to the locked position under the elastic force of the first elastic member 71.

[0047] The adjustment button 9 includes a pressing portion 90 and a driving portion 91. The pressing portion 90 is at least partially exposed on the outside of the handle 8. One end of the driving portion 91 can drive the positioning block 70 to move, and the other end is fixedly connected to the pressing portion 90. The adjustment button 9 can be formed by the pressing portion 90 and the driving portion 91 being integrally formed, or by the pressing portion 90 and the driving portion 91 being detachably connected.

[0048] Specifically, a first wedge surface 910 is provided at one end of the driving portion 91, and a second wedge surface 700 matched with the first wedge surface 910 is provided on the positioning block 70. When the adjustment button 9 moves downward, the first wedge surface 910 and the second wedge surface 700 slide relative to each other.

[0049] A positioning seat 10 is fixed on the machine body 1 , and the other end of the first elastic member 71 abuts against the positioning seat 10 . The positioning seat 10 is used to limit the movement direction of the positioning block 70 .

[0050] Specifically, an opening 100 is provided on the positioning seat 10 , and the positioning block 70 at least partially passes through the opening 100 and moves along the direction of the opening 100 .

[0051] A sliding block 702 is protruded from one side of the positioning block 70 away from the locking groove 720 . The sliding block 702 at least partially passes through the opening 100 and moves along the direction of the opening 100 .

[0052] A second elastic member 11 is further provided between the positioning seat 10 and the driving portion 91 . One end of the second elastic member 11 abuts against one end of the driving portion 91 and the other end abuts against the positioning seat 10 , and is used to drive the adjustment button 9 to move upward to reset.

[0053] The height adjustment mechanism of the working machine also includes a third elastic member 12, one end of the third elastic member 12 is connected to the positioning seat 10, and the other end is connected to the connecting member 6, and the third elastic member 12 is used to drive the positioning seat 10 to reset.

[0054] A hook member 60 is fixed to a position of the connecting member 6 close to the rear tire 30 , and the other end of the third elastic member 12 is matched with the hook member 60 .

[0055] The front wheel support 4 and the rear wheel support 5 each have a first end 40 / 50, a second end 41 / 51 and a third end 42 / 52; the front wheel axle 2 is fixed at the first end 40, the front tire 20 is fixedly connected to the second end 41 via the front positioning rod 21, and one end of the connecting member 6 is hinged to the third end 42; the rear wheel axle 3 is fixed at the first end 50, the rear tire 30 is fixedly connected to the second end 51 via the rear positioning rod 31; the other end of the connecting member 6 is hinged to the third end 52.

[0056] A first connecting rod 22 is embedded in the front wheel support 4, and a second connecting rod 32 is embedded in the rear wheel support 5. One end of the first connecting rod 22 is fixedly connected to the front wheel axle 2, and the other end is fixedly connected to the front positioning rod 21; one end of the second connecting rod 32 is fixedly connected to the rear wheel axle 3, and the other end is fixedly connected to the rear positioning rod 31.

[0057] The height adjustment structure in the utility model is divided into a locked state and an unlocked state. Figure 4 and Figure 7 When the height adjustment structure is in the locked state, under the elastic force of the first elastic member 71, the positioning block 70 and the shift plate 72 are mutually engaged and locked. Figure 8When the blade height needs to be adjusted, the user holds the handle 8 and presses the adjustment button 9 downward with the thumb. When the adjustment button 9 moves downward, the first wedge surface 910 slides relative to the second wedge surface 700, so that the entire positioning block 70 moves leftward, and the positioning block 70 and the shift plate 72 are separated from each other. At the same time, the first elastic member 71 is also squeezed by the positioning block 70. At this time, the body 1 can be moved up and down by the handle 8, driving the connecting member 6 and the shift plate 72 to move forward and backward. When the adjustment button 9 is released, the second elastic member 11 drives the adjustment button 9 to reset upward. The positioning block 70 moves rightward under the elastic force of the first elastic member 71, and the clamping block 701 is re-engaged between the locking grooves 720, so that the positioning block 70 is locked with the shift plate 72 again. The above actions realize that by pressing the adjustment button 9, the connecting member 6 and the shift plate 72 can move forward and backward relative to the body 1. When the adjustment button 9 is released, the toothed parts of the connecting member 6 and the shift plate 72 are engaged, and the connecting member 6 and the shift plate 72 cannot move forward and backward.

[0058] like Figure 3 and Figure 6 As shown, within a certain range, when the connecting member 6 moves forward, the front wheel axle 2 and the rear wheel axle 3 rotate counterclockwise around their rotation centers at the same time, wherein the rotation center of the front wheel axle 2 is located at its first end 40, and the rotation center of the rear wheel axle 3 is located at its first end 50. At this time, the positions of the second end 41 on the front wheel axle 2 and the second end 51 on the rear wheel axle 3 should move downward relative to the machine body 1. However, since the second end 41 on the front wheel axle 2 is installed with the front tire 20, and the second end 41 on the rear wheel axle 3 is installed with the rear tire 30, and since the front tire 20 and the rear tire 30 are placed on the ground and cannot move downward, at this time, the machine body 1 moves upward relative to the ground to achieve a higher cutting height. Within a certain range, when the connecting member 6 moves backward, the front wheel axle 2 and the rear wheel axle 3 rotate clockwise around their rotation centers at the same time. At this time, the positions of the second end 41 on the front wheel axle 2 and the second end 51 on the rear wheel axle 3 should move upward relative to the machine body 1. However, since the second end 41 on the front wheel axle 2 is equipped with the front tire 20, and the second end 41 on the rear wheel axle 3 is equipped with the rear tire 30, and since the front tire 20 and the rear tire 30 are placed on the ground and cannot leave the ground and move upward, the machine body 1 can only move downward relative to the ground at this time, thereby achieving a lower cutting height. In summary, by pressing the adjustment button 9, the connecting member 6 and the shift plate 72 can move forward and backward relative to the machine body 1, and the cutting height can be adjusted up and down at this time. Release the adjustment button 9, the positioning block 70 is partially engaged and locked with the shift plate 72, and the connecting member 6 and the shift plate 72 cannot move forward and backward, that is, positioning at the required cutting height is achieved.

[0059] By holding the handle 8 and pressing the adjustment button 9 downward, the adjustment button 9 directly acts on the positioning block 70. The first wedge surface 910 and the second wedge surface 700 are relative to each other to achieve the engagement and separation of the positioning block 70 and the shift plate 72. Pressing the adjustment button 9 only needs to overcome the elastic force of the first elastic member 71 and the second elastic member 11, which can be done with one finger. The downward pressing force of the adjustment button 9 is offset by the upward holding force of the handle 8, and will not cause the entire machine to move downward. The structure is simple and reliable, occupies little space, and is easy to operate.

[0060] When the positioning block 70 is separated from the shift plate 72, the handle 8 is held by hand to intuitively drive the machine body 1 to rise and fall, which saves effort in operation. The movement direction of the machine body 1 is consistent with the direction of the operating force, and it is easy to grasp. This overcomes the disadvantage of pressing the knob downward while moving the entire machine upward during conventional height adjustment.

[0061] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A height adjustment mechanism for a working machine, the working machine comprising a machine body (1) and a blade arranged on the machine body (1), the front end and the rear end of the machine body (1) being rotatably connected to a front wheel shaft (2) and a rear wheel shaft (3) respectively, characterized in that: The height adjustment mechanism comprises: A front wheel support member (4) is swingably disposed at the front end of the machine body (1) and fixedly connected to the front wheel shaft (2), and is used to support the front tire (20); A rear wheel support member (5) is swingably disposed at the rear end of the machine body (1) and is fixedly connected to the rear wheel axle (3) and is used to support a rear tire (30); a connecting member (6) connected to the front wheel support member (4) and the rear wheel support member (5) at the same time, so that the front wheel support member (4) and the rear wheel support member (5) can move in an interlocking manner, and the connecting member (6) can be displaced in the front-to-back direction and the up-down direction relative to the swinging of the front wheel support member (4) and the rear wheel support member (5); A locking mechanism (7) for limiting the displacement of the connecting member (6) in the front-to-back direction; the locking mechanism (7) comprises a positioning block (70), a first elastic member (71) and a plurality of locking grooves (720); the plurality of locking grooves (720) are arranged on the connecting member (6) from front to back in sequence; the positioning block (70) is movable between a locking position and an unlocking position; one end of the first elastic member (71) abuts against the positioning block (70) for maintaining the positioning block (70) in the locking position; at this time, the positioning block (70) is interlocked with one of the plurality of locking grooves (720); A handle (8) fixed on the machine body (1); an adjusting button (9) which can slide in an up-down direction, and one end of the adjusting button (9) is located inside the handle (8) for driving the positioning block (70) to move, and the other end is exposed outside the handle (8); When it is necessary to adjust the height of the working machine, the user holds the handle (8) and presses the adjustment button (9) downward with the thumb, and the adjustment button (9) moves downward and overcomes the elastic force of the first elastic member (71) to push the positioning block (70) from the locked position to the unlocked position. At this time, the user can pull up and / or press down the handle (8) to adjust the blade on the machine body (1) to a target height position; When the blade on the machine body (1) has been adjusted to a target height position, the adjustment button (9) is released, and at this time, the positioning block (70) returns from the unlocking position to the locking position under the elastic force of the first elastic member (71).

2. The height adjustment mechanism of the working machine according to claim 1, characterized in that: The regulating button (9) comprises a pressing portion (90) and a driving portion (91); the pressing portion (90) is at least partially exposed outside the handle (8); one end of the driving portion (91) can drive the positioning block (70) to move, and the other end is fixedly connected to the pressing portion (90).

3. The height adjustment mechanism of the working machine according to claim 2, characterized in that: A first wedge-shaped surface (910) is provided at one end of the driving portion (91), and a second wedge-shaped surface (700) matched with the first wedge-shaped surface (910) is provided on the positioning block (70), and when the adjustment button (9) moves downward, the first wedge-shaped surface (910) and the second wedge-shaped surface (700) slide relative to each other.

4. The height adjustment mechanism of the working machine according to claim 2, characterized in that: A positioning seat (10) is fixed on the machine body (1), the other end of the first elastic member (71) abuts against the positioning seat (10), and the positioning seat (10) is used to limit the movement direction of the positioning block (70).

5. The height adjustment mechanism of the working machine according to claim 4, characterized in that: An opening (100) is provided on the positioning seat (10), and the positioning block (70) at least partially passes through the opening (100) and moves along the direction of the opening (100).

6. The height adjustment mechanism of the working machine according to claim 5, characterized in that: A sliding block (702) is protrudingly provided on one side of the positioning block (70) away from the locking groove (720), and the sliding block (702) at least partially passes through the opening (100) and moves along the direction of the opening (100).

7. The height adjustment mechanism of the working machine according to claim 4, characterized in that: A second elastic member (11) is further provided between the positioning seat (10) and the driving portion (91); one end of the second elastic member (11) abuts against one end of the driving portion (91) and the other end abuts against the positioning seat (10), and is used to drive the adjustment button (9) to reset.

8. The height adjustment mechanism of the working machine according to claim 4, characterized in that: The working machine height adjustment mechanism further comprises a third elastic member (12), one end of the third elastic member (12) being connected to the positioning seat (10) and the other end of the third elastic member (12) being connected to the connecting member (6).

9. The working machine height adjustment mechanism according to claim 8, characterized in that: A hook member (60) is fixed to the connecting member (6) at a position close to the rear tire (30); the other end of the third elastic member (12) is matched with the hook member (60); and the third elastic member (12) is used to drive the positioning seat (10) to reset.

10. The height adjustment mechanism of the working machine according to claim 1, characterized in that: The locking mechanism (7) further comprises a shift plate (72), the shift plate (72) being fixed on the connecting member (6), and a plurality of locking grooves (720) being sequentially formed on the shift plate (72) from front to back.

11. The height adjustment mechanism of the working machine according to claim 1, characterized in that: At least one locking block (701) is protrudingly provided on one side of the positioning block (70) close to the locking groove (720); when the positioning block (70) is located at the locking position, the locking block (701) is at least partially received in the locking groove (720).

12. The height adjustment mechanism of the working machine according to claim 1, characterized in that: The front wheel support member (4) and the rear wheel support member (5) both have a first end (40, 50), a second end (41, 51) and a third end (42, 52); The front wheel axle (2) is fixed to the first end (40), the front tire (20) is fixedly connected to the second end (41) via a front positioning rod (21), and one end of the connecting member (6) is hinged to the third end (42); The rear wheel axle (3) is fixed to the first end (50), and the rear tire (30) is fixedly connected to the second end (51) via a rear positioning rod (31); the other end of the connecting member (6) is hinged to the third end (52).

13. The working machine height adjustment mechanism according to claim 12, characterized in that: The front wheel support member (4) is embedded with a first connecting rod (22), and the rear wheel support member (5) is embedded with a second connecting rod (32); one end of the first connecting rod (22) is fixedly connected to the front wheel axle (2), and the other end is fixedly connected to the front positioning rod (21); one end of the second connecting rod (32) is fixedly connected to the rear wheel axle (3), and the other end is fixedly connected to the rear positioning rod (31).

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