Tractor external lifter operating device and tractor with same

Abstract

The invention relates to the technical field of agricultural equipment, in particular to a tractor external lifter control device and a tractor with the same. The tractor external lifter control device comprises an external lifter handle mechanism, a mandrel and a positioning guide assembly, one end of the mandrel penetrates through the positioning guide assembly and is connected with an internal lifting control mechanism, the external lifter handle mechanism is connected with the other end of the mandrel, and the positioning guide assembly is connected with the external lifter handle mechanism. And the pulling device is used for pulling the mandrel and driving the built-in lifting control mechanism to operate, so that the lifter big arm is controlled through the built-in lifting control mechanism. The lifting device has the advantages that the structural design is simple and reasonable, a driver does not need to repeatedly enter a cab to operate the lifting device operating device when maintaining and repairing a machine tool, and the operation efficiency is greatly improved; and the machine tool does not need to go back and forth during hanging, so that the machine tool hanging efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural machinery equipment, and in particular to a tractor external lifter operating device and a tractor having the same. Background Art

[0002] Traditional lifter controls are often located inside the cab. When the driver is performing maintenance and repairs on the equipment, the driver needs to enter the cab to operate the lifter controls, and then return to the equipment to handle the equipment. This requires the driver to go back and forth to the cab many times, which seriously affects the work efficiency. In addition, when attaching the equipment, the efficiency of the equipment attachment will be low due to the presence of the cab.

[0003] Based on this, it is necessary to develop a tractor external lifter operating device to overcome the above technical problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a tractor external lifter operating device and a tractor having the same, which effectively overcomes the defects of the prior art.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A tractor external lifter operating device comprises an external lifter handle mechanism, a core shaft and a positioning guide assembly, wherein one end of the core shaft passes through the positioning guide assembly and is connected to a built-in lift operating mechanism, and the external lifter handle mechanism is connected to the other end of the core shaft and is used to pull the core shaft and drive the built-in lift operating mechanism to operate, thereby controlling the lifter boom through the built-in lift operating mechanism.

[0007] Based on the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the above-mentioned external lifter handle mechanism includes a box body, a rack, a gear and a knob driver. The above-mentioned gear is rotatably installed in the above-mentioned box body, and the above-mentioned rack is linearly movably installed in the above-mentioned box body and is consistent with the above-mentioned gear. The above-mentioned box body is provided with a wire entry hole, and the other end of the above-mentioned core shaft passes through the above-mentioned wire entry hole and is connected and fixed to one end of the above-mentioned rack. The above-mentioned knob driver is connected to one end of the above-mentioned gear and passes through the above-mentioned box body. The above-mentioned knob driver is used to drive the above-mentioned gear to rotate and drive the above-mentioned rack to move linearly, thereby pulling the above-mentioned core shaft.

[0009] Furthermore, the box body includes an upper cover and a lower cover, which are buckled together and fixed by screws. A positioning ring is provided in the inner middle area of ​​the lower cover, and a positioning hole is coaxially provided in the middle of the gear. The gear is nested outside the positioning ring through the positioning hole, and the two ends of the gear are respectively close to or in contact with the inner side surfaces of the upper cover and the lower cover.

[0010] Furthermore, a straight edge is provided on the inner side of one side of the upper cover and the lower cover near the edge, and the rack is attached to the straight edge. Guide bosses are provided on both ends of one side of the lower cover near the straight edge, and the two ends of the rack are respectively arranged between the guide bosses and the straight edge at both ends.

[0011] Furthermore, the knob driving component includes a knob shaft and a knob, one end of the knob shaft is coaxially provided with a circular ring-shaped engaging portion with a diameter larger than the knob shaft, the engaging portion is coaxially nested in the positioning hole in the middle of the gear, the engaging portion and the inner wall of the positioning hole are jointly provided with an engaging groove, a connecting block is engaged in the engaging groove, and the other end of the knob shaft passes through the upper cover and is connected to the knob.

[0012] Furthermore, the positioning guide assembly includes a mounting plate and a guide tube, the guide tube vertically penetrates the mounting plate, a thread is provided on the surface of the guide tube, fixing nuts are screwed on the two sides of the guide tube corresponding to the mounting plate, the fixing nuts on both sides clamp the mounting plate, and one end of the core shaft passes through the guide tube.

[0013] Furthermore, a rubber tube is sleeved on the outer side of the core shaft, the rubber tube passes through the guide tube and is connected and fixed with the guide tube, the other end of the rubber tube is connected to the wire inlet hole, and a tube clamp fixer is provided on the rubber tube.

[0014] Furthermore, the above-mentioned built-in lifting operating mechanism includes a sleeve-shaped rotating hub, a built-in rotating shaft, an external active rocker arm and a built-in passive rocker arm, a connecting rod fork assembly and a valve body rocker arm. The above-mentioned built-in rotating shaft coaxially passes through the two ends of the above-mentioned rotating hub and is rotatably connected to the corresponding part of the tractor. The above-mentioned external active rocker arm is connected to one end of the above-mentioned rotating hub and is connected to one end of the above-mentioned core shaft. The above-mentioned built-in passive rocker arm is vertically connected to the other end of the above-mentioned rotating hub. The two ends of the above-mentioned connecting rod fork assembly are respectively movably connected to the end of the above-mentioned external active rocker arm away from the rotating hub and one end of the valve body rocker arm. The other end of the above-mentioned valve body rocker arm is connected to the input shaft of the above-mentioned lifter boom control valve. The middle part of the upper end of the above-mentioned rotating hub is connected with the built-in active rocker arm.

[0015] Furthermore, a connecting portion is provided at one end of the external active rocker arm away from the rotating hub, and an axis core head is provided at one end of the core shaft, and the axis core head vertically penetrates the connecting portion.

[0016] The beneficial effects of the present invention are: the structural design is simple and reasonable, which enables the driver to maintain and repair the equipment without having to repeatedly enter the cab to operate the lifting device, thereby greatly improving the working efficiency; and there is no need to go back and forth to the cab when attaching the equipment, thereby improving the equipment attachment efficiency.

[0017] A tractor is also provided, comprising an external lifter operating device for the tractor, wherein the external lifter handle mechanism is installed outside the cab. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the tractor external lifter operating device of the present invention;

[0019] Figure 2 The invention discloses an explosion-proof mechanism for the external lifter handle in the tractor external lifter operating device. Figure 1 ;

[0020] Figure 3 The invention discloses an explosion-proof mechanism for the external lifter handle in the tractor external lifter operating device. Figure 2 ;

[0021] Figure 4 It is a structural schematic diagram of a positioning guide assembly in a tractor external lifter operating device of the present invention;

[0022] Figure 5 It is a structural schematic diagram of the built-in lifting control mechanism in the tractor external lifting device control device of the present invention;

[0023] Figure 6 The present invention is a schematic structural diagram of the connection between the lifter boom control valve and the valve body rocker arm involved in the tractor external lifter operating device of the present invention.

[0024] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0025] 1. External lifter handle mechanism; 2. Mandrel; 3. Positioning guide assembly; 4. Internal lift control mechanism; 11. Box body; 12. Rack; 13. Gear; 14. Knob driver; 21. Shaft core head; 31. Mounting plate; 32. Guide tube; 33. Fixing nut; 41. Hub; 42. Internal shaft; 43. External active rocker arm; 44. Internal passive rocker arm; 45. Connecting rod fork assembly; 46. Valve body rocker arm; 47. Internal active rocker arm; 111. Upper cover; 112. Lower cover; 141. Knob shaft; 142. Knob; 143. Fitting part; 144. Connecting block; 321. Rubber tube; 431. Connecting part; 461. Connecting arm; 1121. Positioning ring; 1122. Guide boss. DETAILED DESCRIPTION

[0026] 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.

[0027] Example: Figure 1 , 2As shown in Figures 3 and 4, the tractor external lifter operating device of this embodiment includes an external lifter handle mechanism 1, a core shaft 2 and a positioning guide assembly 3. One end of the core shaft 2 passes through the positioning guide assembly 3 and is connected to the built-in lift operating mechanism 4. The external lifter handle mechanism 1 is connected to the other end of the core shaft 2 to pull the core shaft 2 and drive the built-in lift operating mechanism 4 to operate, thereby controlling the lifter boom through the built-in lift operating mechanism 4.

[0028] The tractor external lifter operating device of this embodiment is connected with the internal lifter operating mechanism 4 through the external lifter handle mechanism 1 and the spindle 2, so as to achieve the purpose of operating the external lifter handle mechanism 1 to pull the spindle 2 to drive the internal lifter operating mechanism 4 to operate. The operation of the internal lifter operating mechanism 4 can control the lifter boom, and the external lifter handle mechanism 1 can be installed at an adapted position outside the tractor, so that the lifter boom can be controlled from the outside of the tractor. When the driver or staff maintains and repairs the machine, or hooks it, the lifter boom can be controlled externally without going back and forth to the cab, which effectively saves the time of maintenance and hooking operation, improves the working efficiency, and also reduces the working intensity of the driver or staff.

[0029] In this embodiment, the core shaft 2 is a flexible steel cable structure that can withstand tension and thrust.

[0030] As a preferred embodiment, the external lifter handle mechanism 1 includes a box body 11, a rack 12, a gear 13 and a knob driver 14. The gear 13 is rotatably installed in the box body 11, and the rack 12 is linearly movably installed in the box body 11 and matches the gear 13. The box body 11 is provided with a wire entry hole, and the other end of the core shaft 2 passes through the wire entry hole and is connected and fixed to one end of the rack 12. The knob driver 14 is connected to one end of the gear 13 and passes through the box body 11. The knob driver 14 is used to drive the gear 13 to rotate and drive the rack 12 to move linearly, thereby pulling the core shaft 2.

[0031] In the above-mentioned implementation scheme, the gear 13 is driven to rotate by the knob driving member 14 exposed outside the box body 11, thereby driving the rack 12 to move linearly along its length direction. The rack 12 can pull the core shaft 2 while moving, thereby driving the built-in lifting control mechanism 4 to operate to achieve the purpose of controlling the lifter arm. The operation is very simple, and only the knob driving member 14 needs to be turned, which is very convenient.

[0032] As a preferred embodiment, Figure 2 and 3As shown, the box body 11 includes an upper cover 111 and a lower cover 112, which are buckled together and fixed by screws. A positioning ring 1121 is provided in the inner middle area of ​​the lower cover 112, and a positioning hole is coaxially provided in the middle of the gear 13. The gear 13 is nested outside the positioning ring 1121 through the positioning hole, and the two ends of the gear 13 are close to or in contact with the inner side surfaces of the upper cover 111 and the lower cover 112 respectively.

[0033] In the above implementation scheme, the box body 11 adopts a split splicing box body, specifically a flat upper cover 111 and a lower cover 112. The upper cover 111 and the lower cover 112 are fastened together and fixed by screws, and a flat assembly cavity is defined between the two. After the gear 13 is positioned by the cooperation of the positioning ring 1121 and the positioning hole, it is just "clamped" in the flat assembly cavity, and the rack 12 is also "clamped" in the flat assembly cavity (the axial thickness of the gear 13 is close to the thickness of the assembly cavity, or the thickness is the same, and the thickness of the rack 12 is also close to the thickness of the assembly cavity, or the thickness is the same), and no shaking will occur. With the drive of the knob driving member 14, the gear 13 can rotate stably. During the rotation of the gear 13, the rack 12 meshing with it can be driven to move linearly. The structural design is simple, which is conducive to the stable cooperation of the gear 13 and the rack 12, and ensures the stable operation of the gear 13 and the rack 12.

[0034] In this embodiment, a threaded hole is opened at one end of the rack 12. After the other end of the core shaft 2 passes through the wire entry hole (one end of the rack 12 is close to the wire entry hole), it is screwed into the threaded hole at one end of the rack 12 through a threaded joint connected thereto.

[0035] As a preferred embodiment, a straight edge is respectively provided on the inside of one side of the upper cover 111 and the lower cover 112 near the edge, and the rack 12 is attached to the straight edge. A guide boss 1122 is respectively provided on both ends of one side of the lower cover 112 near the straight edge, and both ends of the rack 12 are respectively arranged between the guide boss 1122 and the straight edge at both ends.

[0036] In the above-mentioned embodiment, a rectangular box-mounted cavity is jointly defined at the edge of one side of the upper cover 111 and the lower cover 112, and the rack 12 is confined in the box-mounted cavity and moves along its length direction. Since the interior of the box-mounted cavity is connected to the inner cavity of the main body of the box body 11, the two ends of the rack 12 are limited by setting guide bosses 1122, so that the rack 12 will not be displaced in the direction of its length, thereby ensuring that the rack 12 has effective linear displacement, preventing the rack 12 from offsetting and generating errors during movement, greatly improving the working accuracy, and achieving good pulling of the core shaft 2.

[0037] As a preferred embodiment, the knob driving member 14 includes a knob shaft 141 and a knob 142. One end of the knob shaft 141 is coaxially provided with a circular ring-shaped engaging portion 143 with a diameter larger than the knob shaft 141. The engaging portion 143 is coaxially nested in the positioning hole in the middle of the gear 13. The engaging portion 143 and the inner wall of the positioning hole are jointly provided with an engaging groove. A connecting block 144 is engaged in the engaging groove. The other end of the knob shaft 141 passes through the upper cover 111 and is connected to the knob 142.

[0038] In the above implementation scheme, the outer diameter of the engaging portion 143 is close to or equal to the diameter of the positioning hole. After the two are engaged, the knob shaft 141 and the gear 13 are stably connected and fixed by embedding the connecting block 144 in the common engaging groove of the engaging portion 143 and the positioning hole. When the knob shaft 141 is rotated by the knob 142, the gear 13 can be stably rotated.

[0039] In this embodiment, the knob 142 can be a conventional knurled knob on the market. The lower part of the knob 142 is provided with a connection hole for inserting the knob shaft 141, and the upper part is provided with an arrow and an English logo indicating the direction of rotation. This design can serve as a warning for the operation direction and largely avoid the harm to the human body caused by misoperation.

[0040] As a preferred embodiment, Figure 4 As shown, the positioning guide assembly 3 includes a mounting plate 31 and a guide tube 32. The guide tube 32 vertically penetrates the mounting plate 31. The surface of the guide tube 32 is provided with threads. The guide tube 32 is screwed with fixing nuts 33 at the positions on both sides corresponding to the mounting plate 31. The fixing nuts 33 on both sides clamp the mounting plate 31. One end of the core shaft 2 passes through the guide tube 32.

[0041] In the above implementation scheme, the function of the mounting plate 31 is to be fixed to the corresponding part of the tractor by screws, and then the mounting plate 31 is clamped after the fixing nuts 33 on both sides are screwed in, so that the positioning guide assembly 3 can be stably assembled on the tractor, thereby achieving a good positioning and installation effect on a section of the core shaft 2.

[0042] In this embodiment, the mandrel 2 is covered with a rubber tube 321, which passes through the guide tube 32 and is connected and fixed to the guide tube 32. The other end of the rubber tube 321 is connected to the wire entry hole, and a tube clamp fixture is provided on the rubber tube 321. The rubber tube 321 can well protect the mandrel 2, and the tube clamp fixture can position the rubber tube 321 and a section of the mandrel 2 to ensure that the pulling direction of the mandrel 2 is correct.

[0043] In this embodiment, the two ends of the guide tube 32 can be squeezed and shaped respectively, and after the rubber tube 321 passes through, the two ends are squeezed outside the rubber tube to achieve good fixation of the two. A wear-resistant rubber sleeve is sleeved on one end of the rubber tube 321.

[0044] It should be noted that when the rack 12 reciprocates, it generates thrust and pull on the core shaft 2. Due to the existence of the guide tube 32, the core shaft 2 always reciprocates inside the rubber sleeve, and the wear-resistant rubber sleeve at the end of the rubber tube 321 can prevent wear and reduce friction resistance, thereby increasing the reliability of the mechanism.

[0045] As a preferred embodiment, Figure 5 As shown, the built-in lifting operating mechanism 4 includes a sleeve-shaped rotating hub 41, a built-in rotating shaft 42, an external active rocker arm 43 and a built-in passive rocker arm 44, a connecting rod fork assembly 45 and a valve body rocker arm 46. The built-in rotating shaft 42 coaxially passes through the two ends of the above-mentioned rotating hub 41 and is rotatably connected to the corresponding part of the tractor. The external active rocker arm 43 is connected to one end of the above-mentioned rotating hub 41 and is connected to one end of the above-mentioned core shaft 2. The above-mentioned built-in passive rocker arm 44 is vertically connected to the other end of the above-mentioned rotating hub 41. The two ends of the above-mentioned connecting rod fork assembly 45 are respectively movably connected to the end of the above-mentioned external active rocker arm 43 away from the rotating hub 41 and one end of the valve body rocker arm 46. The other end of the above-mentioned valve body rocker arm 46 is connected to the input shaft of the above-mentioned lifter boom control valve (denoted by B in the figure), and the middle part of the upper end of the above-mentioned rotating hub 41 is connected with the built-in active rocker arm 47.

[0046] In the above implementation scheme, when the core shaft 2 is pulled, the core shaft 2 will pull the external active rocker arm 43, and pull the rotating hub 41 to rotate a certain angle through the external active rocker arm 43. During the rotation of the rotating hub 41, the built-in passive rocker arm 44 at the other end will pull the connecting rod fork assembly 45 to drive the valve body rocker arm 46 to swing. During the swinging process of the valve body rocker arm 46, the input shaft of the lifter arm control valve connected and fixed thereto will be driven to rotate, thereby realizing the operation of the lifter arm, and the operation is very simple and convenient.

[0047] In this embodiment, a crescent-shaped handle is provided at the upper end of the built-in active rocker arm 47, which can simulate the state of a human hand grasping and improve the comfort of operation. The upper and lower sections of the built-in active rocker arm 47 are designed to be at a fixed angle, which can move the handle installed at the upper end forward. When the driver sits in the cab, the handle is just located on the right front side of the arm, and the operation is most comfortable at this time, which greatly improves the comfort of ergonomics.

[0048] In this embodiment, Figure 6As shown, one end of the valve body rocker arm 46 connected to the input shaft of the lifter arm control valve is also provided with a connecting arm 461 which is inclined at a certain (upward) angle with its main body, and a limit plate (denoted by A in the figure) is provided on one side of the lifter arm control valve, and an arc-shaped limit hole (denoted by a in the figure) is provided on the upper end of the limit plate, and the connecting arm 461 extends to one side of the limit hole at one end away from the main body of the valve body rocker arm 46, and the end of the connecting arm 461 passes through the limit hole through a threaded pin shaft perpendicular to the connecting arm 461, and is screwed with a limit buckle, and a spring is clamped between the limit buckle and the limit plate. This design can limit the swing angle of the valve body rocker arm 46 to prevent over-operation.

[0049] Of course, the hub 41 can also be driven to rotate by operating the built-in active rocker arm 47 in the cab, thereby controlling the operation of the lifter boom.

[0050] In this embodiment, the end of the external active rocker arm 43 away from the rotating hub 41 is provided with a connecting portion 431, and the end of the core shaft 2 is provided with an axial core head 21, and the axial core head 21 vertically penetrates the connecting portion 431. Specifically, the external active rocker arm 43 is a Z-shaped sheet metal part, one end of which is vertically connected and fixed to the lower part of one end of the rotating hub 41, and its main body is parallel to the long axis of the rotating hub 41, and the other end constitutes the connecting portion 431. The axial core head 21 is a special-shaped structure, and a threaded hole is provided at the cylindrical end, which can be fixed together with one end of the core shaft 2, and a cylindrical boss is vertically provided at the flat end of the ball head, and a thread is provided on the boss, and a nut can be installed. After the boss passes through the connecting portion 431, the nut can be screwed in and locked.

[0051] It should be noted that: in this embodiment, the lifter arm control valve is an accessory in the existing tractor, and its specific structure and function are not described in detail here. Similarly, the built-in lift control mechanism 4 is also an accessory of the conventional tractor. In this embodiment, only an external active rocker arm 43 is installed on the rotating hub 41 to connect with one end of the spindle 2.

[0052] Example 2

[0053] The tractor of this embodiment includes the tractor external lifter operating device in Embodiment 1, and the external lifter handle mechanism 1 is installed outside the cab at a position convenient for the driver to inspect and maintain.

[0054] In the description of the present invention, it is to 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”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, 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 limiting the present invention.

[0055] 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 invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0056] 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.

[0057] In the present invention, 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.

[0058] 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 present invention. 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.

[0059] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A tractor external lifter operating device, characterized in that: The invention comprises an external lifter handle mechanism (1), a core shaft (2) and a positioning guide assembly (3); one end of the core shaft (2) passes through the positioning guide assembly (3) and is connected to a built-in lift control mechanism (4); the external lifter handle mechanism (1) is connected to the other end of the core shaft (2) and is used to pull the core shaft (2) and drive the built-in lift control mechanism (4) to operate, thereby controlling the lifter arm through the built-in lift control mechanism (4).

2. The tractor external lifter operating device according to claim 1, characterized in that: The external lifter handle mechanism (1) comprises a box body (11), a rack (12), a gear (13) and a knob driving member (14); the gear (13) is rotatably mounted in the box body (11); the rack (12) is linearly movably mounted in the box body (11) and is matched with the gear (13); the box body (11) is provided with a wire entry hole; the other end of the core shaft (2) passes through the wire entry hole and is connected and fixed to one end of the rack (12); the knob driving member (14) is connected to one end of the gear (13) and passes through the box body (11); the knob driving member (14) is used to drive the gear (13) to rotate and drive the rack (12) to move linearly, thereby pulling the core shaft (2).

3. The tractor external lifter operating device according to claim 2, characterized in that: The box body (11) comprises an upper cover (111) and a lower cover (112); the upper cover (111) and the lower cover (112) are buckled with each other and fixed by screws; a positioning ring (1121) is provided in the middle area of ​​the inner side of the lower cover (112); a positioning hole is coaxially provided in the middle of the gear (13); the gear (13) is nested outside the positioning ring (1121) through the positioning hole; and two ends of the gear (13) are respectively close to or in contact with the inner side surfaces of the upper cover (111) and the lower cover (112).

4. The tractor external lifter operating device according to claim 3, characterized in that: A straight edge is provided at the inner part of one side of the upper cover (111) and the lower cover (112) near the edge, and the rack (12) is in contact with the straight edge. Guide bosses (1122) are provided at the two ends of one side of the lower cover (112) near the straight edge, and the two ends of the rack (12) are respectively arranged between the guide bosses (1122) and the straight edge at the two ends.

5. The tractor external lifter operating device according to claim 3, characterized in that: The knob driving member (14) comprises a knob shaft (141) and a knob (142); one end of the knob shaft (141) is coaxially provided with a circular annular engaging portion (143) having a diameter greater than the knob shaft; the engaging portion (143) is coaxially embedded in a positioning hole in the middle of the gear (13); the engaging portion (143) and the inner wall of the positioning hole are provided with an engaging groove; a connecting block (144) is engaged in the engaging groove; the other end of the knob shaft (141) passes through the upper cover (111) and is connected to the knob (142).

6. The tractor external lifter operating device according to claim 2, characterized in that: The positioning guide assembly (3) comprises a mounting plate (31) and a guide tube (32). The guide tube (32) vertically penetrates the mounting plate (31). The surface of the guide tube (32) is provided with threads. The guide tube (32) is screwed with fixing nuts (33) at positions on both sides corresponding to the mounting plate (31). The fixing nuts (33) on both sides clamp the mounting plate (31). One end of the core shaft (2) passes through the guide tube (32).

7. The tractor external lifter operating device according to claim 6, characterized in that: The core shaft (2) is sheathed with a rubber tube (321), the rubber tube (321) passes through the guide tube (32) and is connected and fixed to the guide tube (32), the other end of the rubber tube (321) is connected to the wire entry hole, and a tube clamp fixer is provided on the rubber tube (321).

8. A tractor external lifter operating device according to any one of claims 1 to 7, characterized in that: The built-in lifting control mechanism (4) comprises a sleeve-shaped rotating hub (41), a built-in rotating shaft (42), an external active rocker arm (43), a built-in passive rocker arm (44), a connecting rod fork assembly (45) and a valve body rocker arm (46). The built-in rotating shaft (42) coaxially passes through the two ends of the rotating hub (41) and is rotatably connected to the corresponding parts of the tractor. The built-in passive rocker arm (44) is connected to one end of the rotating hub (41) and to one end of the core shaft (2). The external active rocker arm (43) is vertically connected to the other end of the rotating hub (41). The two ends of the connecting rod fork assembly (45) are respectively movably connected to one end of the external active rocker arm (43) away from the rotating hub (41) and one end of the valve body rocker arm (46). The other end of the valve body rocker arm (46) is connected to the input shaft of the lifter boom control valve. The middle part of the upper end of the rotating hub (41) is connected to the built-in active rocker arm (47).

9. The tractor external lifter operating device according to claim 8, characterized in that: A connecting portion (431) is provided at one end of the external active rocker arm (43) away from the rotating hub (41), and an axial core head (21) is provided at one end of the core shaft (2), wherein the axial core head (21) vertically penetrates the connecting portion (431).

10. A tractor, characterized in that: It comprises an external lifter operating device for a tractor as claimed in any one of claims 1 to 9, wherein the external lifter handle mechanism (1) is installed outside the cab.

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