Heat dissipation device for tractor and working method of heat dissipation device

Abstract

The invention belongs to the technical field of general vehicles, and particularly relates to heat dissipation equipment for a vehicle, in particular to a heat dissipation device for a tractor and a working method of the heat dissipation device. The heat dissipation device for the tractor comprises at least two sets of grating plates arranged in parallel, and the middle of each set of grating plates is rotatably arranged on the inner wall of a fixing frame through a hinge shaft; the adjusting assembly is arranged on the inner wall of the fixing frame in a sliding mode and comprises telescopic adjusting blocks which are symmetrically arranged, and the outer ends of the telescopic adjusting blocks abut against the grating plate; when the telescopic adjusting blocks move to the innermost ends of the grating plates, the telescopic adjusting blocks tightly abut against the side walls of the inner ends of the two grating plates correspondingly, so that the air inlet amount between the two grating plates is in the minimum state. When the telescopic adjusting blocks move to the outermost ends of the grating plates, the telescopic adjusting blocks extend outwards and push the outer ends of the two adjacent grating plates to enable the two adjacent grating plates to turn outwards, and a V-shaped flow guide channel with an opening facing the incoming flow direction is formed between the two grating plates.

Description

Technical Field

[0001] This invention belongs to the field of general vehicle technology, specifically relating to heat dissipation equipment for vehicles, and more particularly to a heat dissipation device for tractor vehicles and its working method. Background Technology

[0002] Tractor trucks, as heavy-duty power vehicles, are widely used in harsh working conditions such as ports, docks, and logistics parks. These environments are typically dusty with high levels of suspended particulate matter in the air. The tractor truck's engine, hydraulic system, and other core components generate a significant amount of heat during operation, thus requiring efficient cooling systems to ensure their normal operating temperature.

[0003] In related technologies, common heat dissipation devices typically feature louvered grilles at the air inlet, adjusting the airflow by changing the opening angle of the grilles. While this method can address different heat dissipation needs to some extent, it has significant drawbacks: The contradiction between dust prevention and heat dissipation efficiency: In dusty conditions, it's necessary to reduce airflow to prevent excessive dust from entering the cooling system and clogging the fins. However, this can lead to insufficient airflow, reduced heat dissipation efficiency, and potentially engine overheating. Conversely, increasing airflow to ensure heat dissipation efficiency can result in a large influx of dust, accelerating system wear and blockage. Current technologies struggle to achieve a good balance between the two core requirements of "efficient heat dissipation" and "effective dust prevention."

[0004] Limited adjustment functions and inability to optimize airflow: Traditional grille angle adjustment can only change the open area of ​​the air inlet, that is, it can only control the "air volume", but cannot optimize the "flow velocity" and "flow direction" of the incoming airflow. The airflow passes through the grille in a relatively gentle manner, and it does not have self-cleaning ability. Dust easily accumulates on the leeward side of the grille, which will still affect the ventilation effect in the long run.

[0005] Therefore, how to resolve the contradiction between air intake and dust prevention effect of grating is a technical problem that urgently needs to be solved in this field.

[0006] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore, the above description is not considered to constitute information related to the technology. Summary of the Invention

[0007] This disclosure provides at least one cooling device for a tractor and its operating method.

[0008] In a first aspect, embodiments of this disclosure provide a cooling device for a tractor unit, comprising: At least two sets of parallel grid plates, the middle part of each set of grid plates is rotatably mounted on the inner wall of the fixed frame via a hinge shaft; The adjusting component is slidably disposed on the inner wall of the fixed frame, and is adapted to push the grid plate to flip when it moves horizontally back and forth; The adjustment component includes symmetrically arranged telescopic adjustment blocks, the outer ends of which abut against the grid plate; When the telescopic adjustment block moves to the middle position of the grille, the two grilles are parallel and the air intake between the two grilles is at its maximum. When the telescopic adjustment block moves to the innermost end of the grille, the telescopic adjustment block abuts tightly against the inner end sidewalls of the two grilles respectively, so that the air intake between the two grilles is at its minimum. When the telescopic adjustment block moves to the outermost end of the grating plate, the telescopic adjustment block extends outward and pushes the outer ends of the two adjacent grating plates respectively, causing them to flip outward, forming a "V"-shaped guide channel with the opening facing the direction of the incoming flow between the two grating plates.

[0009] In one optional embodiment, the grid plate is provided with a plurality of mesh holes, the mesh holes having a diameter of 1-3 mm.

[0010] In one alternative implementation, the adjustment component includes: Vertical bars are slidably mounted on the inner wall of the fixed frame; The horizontal bar is vertically fixed to the inner wall of the vertical bar and is located between the two grid plates; The two telescopic adjustment blocks are respectively disposed on the upper and lower surfaces of the horizontal bar, and extend or retract along the direction of the vertical bar.

[0011] In one alternative embodiment, a torsion spring is sleeved on the outer wall of the hinge shaft, with one end of the torsion spring fixed to the grating plate and the other end fixed to the inner wall of the fixing frame.

[0012] In one alternative implementation, the horizontal movement of the horizontal bar is 0.6-0.9 times the length of the grating plate.

[0013] In one alternative embodiment, the spacing between two adjacent grid plates is 1.5 to 2.5 times the height of the grid plate.

[0014] In one optional embodiment, a driving device is fixed to the outside of the fixed frame, and a linear sliding pair is provided on the inner wall of the driving frame, which is connected to the driving device in a transmission manner. The vertical bar is fixed to the movable end of the linear sliding pair, and the driving device is adapted to drive the vertical bar to move horizontally reciprocatingly.

[0015] In one optional implementation, the telescopic adjustment block includes: The base layer is fixed to the side wall of the horizontal strip and is hollow inside; The telescopic block is slidably installed within the base layer; A drive unit, located within the base layer, is used to drive the telescopic block to move up and down relative to the base layer.

[0016] In one optional embodiment, a cooling device for a tractor unit further includes: At least two sets of parallel grid plates, the middle part of each set of grid plates is rotatably mounted on the inner wall of the fixed frame via a hinge shaft; Adjustment assembly, which is slidably disposed on the inner wall of the fixed frame, includes: Vertical bars are slidably mounted on the inner wall of the fixed frame; The horizontal bar is vertically fixed to the inner wall of the vertical bar and is located between the two grid plates; The two telescopic adjustment blocks are respectively disposed on the upper and lower surfaces of the horizontal bar, and extend or retract along the direction of the vertical bar.

[0017] In one optional implementation, the telescopic adjustment block includes: The base layer is fixed to the side wall of the horizontal strip and is hollow inside; The telescopic block is slidably installed within the base layer; A drive unit, located within the base layer, is used to drive the telescopic block to move up and down relative to the base layer.

[0018] Secondly, this disclosure also provides a method for operating a cooling device for a tractor, the method comprising: When the adjustment component moves to the middle position of the grille, the two telescopic adjustment blocks contact the inner end sidewalls of the two adjacent grilles respectively, and the two grilles are parallel to maximize the air intake between the two grilles. When the adjustment component moves to the innermost position of the grille, the outer walls of the two telescopic adjustment blocks abut tightly against the inner side walls of the two grilles, and the outer side walls of the two adjacent grilles also abut against each other, so that the air intake between the two grilles is at its minimum. When the adjustment component moves to the outermost position of the grid plate, the telescopic adjustment block extends outward and pushes the outer ends of the two adjacent grid plates respectively, causing the two grid plates to rotate outward around their respective hinge axes, forming a "V"-shaped guide channel with the opening facing the direction of the incoming flow between the two grid plates. When the airflow passes through the "V"-shaped channel, the flow velocity increases, and the air intake velocity is at its maximum at this time.

[0019] The beneficial effects of this invention are that it provides a cooling device for tractor vehicles and its operating method. By adjusting the cooperation between the components and the grille, and through the simple linear movement of a retractable adjusting block, it achieves flexible switching between three modes: maximum airflow (strong heat dissipation), complete closure (high dust prevention), and maximum airflow (Venturi effect, dust prevention while ensuring basic heat dissipation). This perfectly solves the contradiction of traditional devices where heat dissipation and dust prevention are mutually exclusive. The innovative "V"-shaped channel design utilizes the Venturi effect (or the principle of acceleration due to changes in cross-sectional area) to actively increase local airflow velocity when a large airflow is not required. The high-speed airflow can more effectively blow away dust adhering to the grille and reduce dust penetration through the gaps in the grille, providing self-cleaning capability and good long-term effectiveness.

[0020] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of the present invention, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 A perspective view of a tractor cooling device provided in an embodiment of this disclosure; Figure 2 A perspective view of the adjustment assembly and grating plate provided in an embodiment of this disclosure; Figure 3 A longitudinal sectional perspective view of the adjustment assembly and the grid plate provided in an embodiment of this disclosure; Figure 4 This is a schematic diagram of the minimum air intake state of the grille provided in an embodiment of the present disclosure; Figure 5 This is a schematic diagram of the maximum air intake state of the grille provided in an embodiment of this disclosure; Figure 6 This is a schematic diagram of the maximum wind speed state of the grating plate provided in an embodiment of this disclosure.

[0024] In the picture: 1. Fixing frame; 2. Grating plate; 20. Hinge shaft; 21. Mesh; 3. Adjustment component; 30. Telescopic adjustment block; 301. Base layer; 302. Telescopic block; 303. Drive component; 31. Vertical bar; 32. Horizontal bar. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0027] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify an entire column of elements when following a column of elements. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0028] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise expressly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0029] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0030] Research has found that common cooling devices typically use louvered grilles at the air inlet, adjusting the airflow by changing the opening angle of the grilles. While this method can address different cooling needs to some extent, it has significant drawbacks: The contradiction between dust prevention and heat dissipation efficiency: In dusty conditions, it's necessary to reduce airflow to prevent excessive dust from entering the cooling system and clogging the fins. However, this can lead to insufficient airflow, reduced heat dissipation efficiency, and potentially engine overheating. Conversely, increasing airflow to ensure heat dissipation efficiency can result in a large influx of dust, accelerating system wear and blockage. Current technologies struggle to achieve a good balance between the two core requirements of "efficient heat dissipation" and "effective dust prevention."

[0031] Limited adjustment functions and inability to optimize airflow: Traditional grille angle adjustment can only change the open area of ​​the air inlet, that is, it can only control the "air volume", but cannot optimize the "flow velocity" and "flow direction" of the incoming airflow. The airflow passes through the grille in a relatively gentle manner, and it does not have self-cleaning ability. Dust easily accumulates on the leeward side of the grille, which will still affect the ventilation effect in the long run.

[0032] Therefore, how to resolve the contradiction between air intake and dust prevention effect of grating is a technical problem that urgently needs to be solved in this field.

[0033] The defects in the above solutions and the reasons for their occurrence are the results of the inventors' practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventors' contributions to this disclosure.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0036] like Figure 1 As shown, at least one embodiment provides a cooling device for a tractor unit, including: a mounting frame 1, multiple sets of grille plates 2, and an adjustment assembly 3. The mounting frame 1, serving as the mounting base, is made of high-strength aluminum alloy or steel to withstand vibrations and impacts during vehicle operation, and is fixed to the air inlet end of the cooling device. The grille plates 2 are rotatably mounted on the inner wall of the mounting frame 1 via hinge shafts 20, forming an adjustable air inlet channel; several of the grille plates 2 are parallel to each other. The adjustment assembly 3 is slidably mounted on the inner wall of the mounting frame 1, and drives the grille plates 2 to rotate via horizontal reciprocating movement, achieving intelligent adjustment of the air intake volume. This structure is compact and suitable for confined spaces such as the engine compartment of a tractor unit, while its modular design facilitates maintenance.

[0037] Reference Appendix Figure 2 Each set of grilles 2 is arranged in parallel to balance ventilation efficiency and dust prevention requirements. The grilles 2 are made of stamped stainless steel or corrosion-resistant coated steel plates, with a number of evenly distributed mesh holes 21, the diameter of which is controlled between 1-3mm. These mesh holes 21 further block dust, fine debris, fibers, and other impurities beyond the spacing of the grilles 2. Even with a larger spacing between the grilles 2, the controlled mesh hole diameter (e.g., 1-3mm) prevents small particles from entering and scratching the radiator fins or internal components. This aperture range has been experimentally verified to effectively block larger particles (such as sand and dust) without excessively affecting airflow. The height of the grilles 2 is typically 50-100mm, and the length is customized according to the dimensions of the mounting bracket 1. The even distribution of the mesh holes 21 disperses the airflow passing through the grilles 2, preventing localized turbulence at the edges of the grilles 2 and allowing the airflow to flow smoothly towards the radiator. Combined with the forward and backward movement of the adjusting component 3, airflow uniformity is further improved, reducing heat dissipation dead zones.

[0038] Reference Appendix Figure 3 The middle part of the grating plate 2 is rotatably connected to the inner wall of the fixing frame 1 via a hinge shaft 20. A torsion spring is sleeved on the outer wall of the hinge shaft 20, with one end of the torsion spring fixed to the grating plate 2 and the other end fixed to the inner wall of the fixing frame 1. This torsion spring provides a restoring force, ensuring that the grating plate 2 remains flipped inward when no external force is applied, as shown in the specific flipping state. Figure 5 As shown. The spacing between two adjacent grille plates 2 is designed to be 1.5-2.5 times the height of grille plate 2. For example, when the height of grille plate 2 is 60mm, the spacing is 90-150mm. This ratio optimizes the airflow distribution and avoids the generation of vortices.

[0039] Reference Appendix Figure 3The adjustment component 3 includes a vertical bar 31, a horizontal bar 32, and symmetrically arranged telescopic adjustment blocks 30. The vertical bar 31 is slidably mounted on the inner wall of the fixed frame 1, and its smooth movement is ensured by a linear guide rail. The horizontal bar 32 is vertically fixed to the inner wall of the vertical bar 31 and is located between the two grid plates 2, forming a cross-shaped support. The telescopic adjustment blocks 30 are respectively disposed on the upper and lower surfaces of the horizontal bar 32 and can extend or retract along the direction of the vertical bar 31. Each telescopic adjustment block 30 includes a base layer 301, a telescopic block 302, and a driving component 303. The base layer 301 is fixed to the side wall of the horizontal bar 32 and is hollow inside. The telescopic block 302 is disposed in the base layer 301 through a sliding pair and is driven to rise and fall by the driving component 303 (such as a micro motor or cylinder). The driving component 303 can precisely adjust the protrusion of the telescopic block 302 according to the control signal to achieve contact or separation with the grid plate 2. Furthermore, the driving component 303 can be a compression spring. When the horizontal bar 32 drives the telescopic adjustment block 30 to move horizontally relative to the grille plate 2, the compression spring can push the telescopic block 302 outward so that the outer end wall of the telescopic block 302 always abuts against the grille plate 2. A driving device is fixed on the outside of the fixing frame 1. This device can be a stepper motor or a hydraulic cylinder, and its output end is connected to the vertical bar 31 through a linear sliding pair (such as a lead screw or gear rack). The driving device receives signals from the vehicle ECU and automatically controls the horizontal reciprocating movement of the vertical bar 31 according to the heat dissipation requirements (such as engine temperature). The horizontal movement stroke of the horizontal bar 32 is designed to be 0.6-0.9 times the length of the grille plate 2. For example, when the length of the grille plate 2 is 200mm, the stroke is 120-180mm, ensuring that the adjustment component 3 can cover the entire range of the grille plate 2.

[0040] The working method and three modes of the cooling system for tractor units are as follows: like Figure 5 As shown, in the maximum air intake state (strong heat dissipation mode), when the adjusting component 3 moves to the middle position of the grille plate 2, the two telescopic adjusting blocks 30 contact the inner end sidewalls of the adjacent grille plates 2 respectively. At this time, the telescopic block 302 protrudes from the base layer 301, and the thrust of the telescopic block 302 on the grille plate 2 overcomes the elastic force of the torsion spring, so that the grille plate 2 remains parallel, forming an air intake channel with the maximum open area. Airflow can pass smoothly, and the air intake volume reaches its maximum, which is suitable for rapid heat dissipation under high-temperature conditions, such as engine cooling of a tractor under heavy load.

[0041] like Figure 4As shown, in the minimum air intake state (high dustproof mode), when the adjusting component 3 moves to the innermost end of the grille plate 2, the outer wall of the telescopic adjusting block 30 tightly abuts against the inner sidewalls of the two grille plates 2. At this time, the outer end of the base layer 301 abuts against the grille plate 2, the grille plate 2 flips under the elastic force of the torsion spring, and the outer sidewalls of the adjacent grille plates 2 abut against each other under the push of the torsion spring, forming a nearly closed state. A small amount of air flows to the radiator only through the mesh 21, the air intake is reduced to the minimum, effectively blocking dust intrusion. It is suitable for standby or low-speed operation in dusty environments (such as port operations) to prevent radiator blockage.

[0042] like Figure 6 As shown, in the maximum wind speed state (Venturi effect dust prevention mode), when the adjusting component 3 moves to the outermost end of the grille plate 2, the telescopic adjusting block 30 extends outward, and the telescopic block 302 protrudes from the base layer 301 to its maximum size. The end of the telescopic block 302 abuts against the side wall of the grille plate 2, pushing the outer ends of the two adjacent grille plates 2 respectively, causing them to flip outward around the hinge axis 20. A "V"-shaped guide channel with an opening facing the direction of incoming flow is formed between the two grille plates 2. When the airflow passes through this channel, it accelerates due to the reduced cross-sectional area of ​​the channel, increasing the flow velocity and generating the Venturi effect. The high-speed airflow can not only blow away the dust accumulated on the surface of the grille plate 2, achieving self-cleaning, but also reduce dust penetration while ensuring basic heat dissipation, making it suitable for medium load or transitional working conditions with more dust. Figures 4 to 6 The middle arrow indicates the direction of airflow.

[0043] At least one embodiment provides a method for operating a cooling device for a tractor, the method comprising: When the adjustment component 3 moves to the middle position of the grille plate 2, the two telescopic adjustment blocks 30 contact the inner end sidewalls of the two adjacent grille plates 2 respectively, and the two grille plates 2 are parallel, so that the air intake between the two grille plates 2 is at its maximum. When the adjustment component 3 moves to the innermost position of the grille plate 2, the outer walls of the two telescopic adjustment blocks 30 abut tightly against the inner side walls of the two grille plates 2, and at the same time, the outer side walls of the two adjacent grille plates 2 also abut against each other, so that the air intake between the two grille plates 2 is at its minimum. When the adjustment component 3 moves to the outermost position of the grid plate 2, the telescopic adjustment block 30 extends outward and pushes the outer ends of the two adjacent grid plates 2 respectively, causing the two grid plates 2 to flip outward around their respective hinge axes 20, forming a "V"-shaped guide channel with the opening facing the direction of the incoming flow between the two grid plates 2. When the airflow passes through the "V"-shaped channel, the flow velocity increases, and at this time the air intake velocity is at its maximum.

[0044] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0045] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as a second element, component, region, layer, or segment.

[0046] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A cooling device for a tractor unit, characterized in that, include: At least two sets of parallel grid plates (2), the middle part of each set of grid plates (2) is rotatably mounted on the inner wall of the fixed frame (1) via a hinge shaft (20); The adjusting component (3) is slidably disposed on the inner wall of the fixed frame (1) and is suitable for pushing the grid plate (2) to flip when it moves horizontally back and forth; The adjustment component (3) includes symmetrically arranged telescopic adjustment blocks (30), the outer ends of which abut against the grid plate (2); When the telescopic adjustment block (30) moves to the middle position of the grille (2), the two grilles (2) are parallel and the air intake between the two grilles (2) is at its maximum. When the telescopic adjustment block (30) moves to the innermost end of the grille (2), the telescopic adjustment block (30) abuts tightly against the inner sidewalls of the two grilles (2) respectively, so that the air intake between the two grilles (2) is at its minimum. When the telescopic adjustment block (30) moves to the outermost end of the grid plate (2), the telescopic adjustment block (30) extends outward and pushes the outer ends of the two adjacent grid plates (2) to make them flip outward, forming a "V"-shaped guide channel with the opening facing the direction of the incoming flow between the two grid plates (2).

2. The cooling device for a tractor as described in claim 1, characterized in that, The grid plate (2) has a number of mesh holes (21) evenly distributed on it, and the mesh hole (21) has a diameter of 1-3mm.

3. The cooling device for a tractor as described in claim 1, characterized in that, The adjustment component (3) includes: A vertical bar (31) is slidably mounted on the inner wall of the fixed frame (1); A horizontal strip (32) is vertically fixed to the inner wall of the vertical strip (31) and located between the two grid plates (2); The two telescopic adjustment blocks (30) are respectively disposed on the upper and lower surfaces of the horizontal bar (32) and extend or retract along the direction of the vertical bar (31).

4. The cooling device for a tractor as described in claim 1, characterized in that, A torsion spring is fitted on the outer wall of the hinge shaft (20). One end of the torsion spring is fixed to the grid plate (2), and the other end is fixed to the inner wall of the fixing frame (1).

5. The cooling device for a tractor as described in claim 3, characterized in that, The horizontal movement of the horizontal bar (32) is 0.6-0.9 times the length of the grid plate (2).

6. The cooling device for a tractor as described in claim 5, characterized in that, The spacing between two adjacent grid plates (2) is 1.5-2.5 times the height of the grid plate (2).

7. The cooling device for a tractor as described in claim 3, characterized in that, A driving device is fixed on the outside of the fixed frame (1). A linear sliding pair is provided on the inner wall of the driving frame and is connected to the driving device. The vertical bar (31) is fixed to the movable end of the linear sliding pair. The driving device is adapted to drive the vertical bar (31) to move horizontally back and forth.

8. The cooling device for a tractor as described in claim 3, characterized in that, The telescopic adjustment block (30) includes: The base layer (301) is fixed to the side wall of the horizontal strip (32) and is hollow inside; The telescopic block (302) is slidably disposed within the base layer (301); A drive unit (303), located within the base layer (301), is used to drive the telescopic block (302) to move up and down relative to the base layer (301).

9. A cooling device for a tractor unit, characterized in that, include: At least two sets of parallel grid plates (2), the middle part of each set of grid plates (2) is rotatably mounted on the inner wall of the fixed frame (1) via a hinge shaft (20); Adjustment component (3), which is slidably disposed on the inner wall of the fixing frame (1), includes: A vertical bar (31) is slidably mounted on the inner wall of the fixed frame (1); A horizontal strip (32) is vertically fixed to the inner wall of the vertical strip (31) and located between the two grid plates (2); Telescopic adjustment blocks (30), the two telescopic adjustment blocks (30) are respectively disposed on the upper and lower surfaces of the horizontal bar (32), and extend or retract along the direction of the vertical bar (31); The telescopic adjustment block (30) includes: The base layer (301) is fixed to the side wall of the horizontal strip (32) and is hollow inside; The telescopic block (302) is slidably disposed within the base layer (301); A drive unit (303), located within the base layer (301), is used to drive the telescopic block (302) to move up and down relative to the base layer (301).

10. A method for operating a cooling device for a tractor, characterized in that, The working method of the tractor cooling device as described in any one of claims 1-9 includes: When the adjustment component (3) moves to the middle position of the grille (2), the two telescopic adjustment blocks (30) respectively contact the inner end sidewalls of the two adjacent grilles (2), and the two grilles (2) are parallel, so that the air intake between the two grilles (2) is at its maximum. When the adjustment component (3) moves to the innermost position of the grille (2), the outer walls of the two telescopic adjustment blocks (30) are in close contact with the inner side walls of the two grilles (2), and the outer side walls of the two adjacent grilles (2) are also in contact with each other, so that the air intake between the two grilles (2) is at its minimum. When the adjustment component (3) moves to the outermost position of the grid plate (2), the telescopic adjustment block (30) extends outward and pushes the outer ends of the two adjacent grid plates (2) respectively, so that the two grid plates (2) flip outward around their respective hinge axes (20), and a "V"-shaped guide channel with the opening facing the direction of the incoming flow is formed between the two grid plates (2). When the airflow passes through the "V"-shaped channel, the flow velocity increases, and the air intake velocity is at its maximum at this time.

Images