Towing vehicle pipe connection device and method of operation thereof

Abstract

The present application belongs to the technical field of vehicle connecting piece, and particularly relates to a connecting piece or its joint, especially a pipeline connecting device for a tractor and a working method thereof; wherein one pipeline connecting device for a tractor comprises a connecting male head and a connecting female head, the connecting male head and the connecting female head are fast-plug matched, and the connecting female head is internally provided with an extension pipe which can be inserted into the inside of the connecting male head; the outer wall of the extension pipe is circumferentially and evenly provided with a plurality of elastic members which extend along the axial direction; the inside of the connecting male head is provided with a bellows and a limiting ring, when the extension pipe is inserted into the bellows, the outer end of the elastic member abuts against the end wall of the limiting ring; wherein when the flow velocity of the airflow in the pipeline instantaneously increases, the airflow pushes the extension pipe to axially slide in the direction away from the connecting male head, the outer end of the elastic member is limited by the limiting ring and elastically deforms along the radial direction, so that the elastic member abuts against the inner wall of the bellows section, and a anti-dropping locking is formed.

Description

Technical Field

[0001] This invention belongs to the field of vehicle connector technology, specifically relating to connectors or their joints, and particularly to a pipeline connection device for tractor vehicles and its working method. Background Technology

[0002] As heavy-duty engineering machinery, the pneumatic braking system and pneumatic control pipelines of tractor trucks are core components ensuring safe operation. The reliability of pipeline joints directly affects the vehicle's braking performance and driving safety. Currently, most tractor truck pneumatic pipelines use quick-connect couplings for rapid assembly and maintenance. These couplings mainly consist of a male connector and a female connector. Connection is achieved by inserting the male connector into the female connector and locking it with internal claws, offering convenient assembly and reliable sealing.

[0003] However, in practical applications, existing quick-connect couplings have the following technical defects: Sudden changes in flow velocity can cause joint loosening. When the tractor brakes, accelerates, or experiences sudden changes in operating conditions, the airflow velocity in the pneumatic pipeline will change drastically. Especially at the point where the inner diameter of the pipeline connected to the female and male connectors decreases, the airflow will impact the inner wall of the connecting pipeline when passing through the male and female connectors, generating axial impact force. Long-term impact can easily lead to failure of the connector claws, loosening or even separation of the male and female connectors, causing air pressure leakage, directly affecting the performance of the braking system, and posing a serious safety hazard. Traditional quick-connect couplings lack an active anti-disengagement mechanism. Existing quick-connect couplings rely solely on the passive locking of the claws, which cannot actively enhance the connection strength under sudden changes in airflow impact force and vibration load, making it difficult to meet the reliability requirements of tractor vehicles under complex working conditions. Threaded connections cannot meet the needs of the scenario. Although traditional threaded connections can improve the static connection strength, they have problems such as low assembly and maintenance efficiency, large space occupation, and poor vibration resistance, which cannot meet the needs of compact layout and rapid maintenance of tractor vehicles.

[0004] Therefore, developing a quick-connect pipe connection device that can actively resist airflow impact and vibration load and prevent joint detachment has become an urgent technical problem to be solved in this field.

[0005] 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

[0006] This disclosure provides at least one pipeline connection device for a tractor and its working method.

[0007] In a first aspect, embodiments of this disclosure provide a pipeline connection device for a tractor, comprising: A male connector and a female connector are connected, and the male connector and the female connector are quick-connect type, and the female connector is provided with an extension tube that can be inserted into the male connector; The extension tube has several elastic elements evenly distributed around its outer wall, and the elastic elements extend axially. The male connector is provided with a corrugated tube and a limiting ring inside. When the extension tube is inserted into the corrugated tube, the outer end of the elastic element abuts against the end wall of the limiting ring. When the airflow velocity in the pipeline increases instantaneously, the airflow pushes the extension pipe to slide axially away from the male connector. The outer end of the elastic element is limited by the limiting ring and undergoes elastic deformation in the radial direction, so that the elastic element abuts against the inner wall of the corrugated pipe section to form an anti-disengagement lock.

[0008] In one optional embodiment, the elastic element is an arc-shaped spring sheet, one end of which is fixed to the outer wall of the extension tube, and the other end extends along the axial direction of the connecting female head to form a free end, which is adapted to abut against the end face of the limiting ring.

[0009] In one optional embodiment, the outer surface of the elastic element is provided with anti-slip teeth, which are adapted to the crests of the bellows section. When the elastic element deforms, the anti-slip teeth engage and lock with the inner wall of the bellows.

[0010] In one optional embodiment, the corrugated pipe is an annular corrugated structure integrally formed with the inner wall of the male connector. The crests and troughs of the corrugated structure are alternately distributed along the axial direction, and the axial distance between the crests and troughs is 5-8 mm, which is used to form multi-point contact with the deformable part of the elastic element.

[0011] In one optional embodiment, the inner diameter of the extension tube is smaller than the inner diameter of the connecting male pipe, forming an airflow contraction section, and the end of the extension tube is provided with a guide cone surface, the cone angle of which is 30-60°.

[0012] In one optional embodiment, the axial length of the elastic element is 15-25 mm, which is greater than the axial distance between adjacent crests and troughs inside the bellows; when the elastic element deforms, the outer wall of the elastic element completely abuts against at least one crest of the inner wall of the bellows.

[0013] In one optional embodiment, the outer wall of the end of the male connector is provided with a plurality of slots along the axial direction; The inner wall of the female connector is provided with a quick-connect claw that is adapted to the slot. The quick-connect claw is an elastic metal claw structure. After being inserted, it engages with the slot to achieve initial locking of the male connector and the female connector.

[0014] In one optional embodiment, the axial length of the slot is greater than the axial length of the quick-connect claw. When the male connector and the female connector are inserted into each other, the end wall of the quick-connect claw abuts against the inner wall of one end of the slot.

[0015] In one optional embodiment, the number of elastic elements is 6-10, which are evenly distributed along the circumference of the extension tube, and the included angle between adjacent elastic elements is 36-60° to ensure that the elastic elements are subjected to uniform force with the inner wall of the corrugated tube when they deform.

[0016] In one optional embodiment, a sealing ring is provided inside the female connector, the sealing ring being hollow inside and abutting against the end wall of the male connector.

[0017] Secondly, this disclosure also provides a method for operating a pipeline connection device for a tractor, the method comprising the following steps: Step 1: Align the end of the male connector with the interface of the female connector, apply axial thrust to make the male connector and the female connector quick-connect fit, insert the extension tube inside the female connector into the bellows of the male connector, the free end of the elastic element abuts against the end wall of the limiting ring, and at the same time the quick-connect claw engages with the annular groove to complete the initial connection and sealing. Step 2: When the airflow is stable under normal operating conditions of the tractor, the elastic element remains in its initial state, and the airflow passes smoothly after being guided by the guide cone surface of the extension pipe. Step 3: When the tractor brakes, accelerates, or the working condition changes suddenly, causing the airflow velocity in the pipeline to increase instantaneously, the high-speed airflow impacts the guide cone surface of the extension tube, generating an axial thrust that pushes the extension tube to slide away from the male connector. Step 4: During the sliding process of the extension tube, the elastic element undergoes elastic deformation, and the arc-shaped spring sheet opens outward. The anti-slip teeth on its outer surface engage and abut with the crests of the corrugated pipe inner wall to form a mechanical lock, preventing the male connector from separating from the female connector. Step 5: When the airflow velocity in the pipeline returns to a stable state, the elastic element resets under its own elastic force, the extension tube returns to its initial position, and the anti-disengagement locking state is unlocked.

[0018] The beneficial effect of this invention is that it provides a pipeline connection device for tractor vehicles and its working method. By incorporating an extension tube into the female connector, the impact energy of high-speed airflow can be converted into axial thrust, rather than directly impacting the inner wall of the pipe. Simultaneously, the inner diameter of the extension tube is smaller than that of the male connector pipe, creating an airflow contraction section that effectively slows down the airflow velocity, reducing the wear and tear on the connection structure from the source. Furthermore, when the airflow pushes the extension tube to slide, the mechanical locking mechanism formed by the elastic element and the bellows responds quickly, preventing the pawls from failing due to long-term impact, and preventing the male and female connectors from loosening and disengaging, thus eliminating the risk of air pressure leakage and ensuring the stable operation of the tractor's braking system.

[0019] 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.

[0020] 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

[0021] 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.

[0022] Figure 1 A perspective view of a pipeline connection device for a tractor provided in an embodiment of this disclosure; Figure 2 A axial sectional perspective view of the pipeline connection device for a tractor provided in the embodiments of this disclosure; Figure 3 An axial sectional perspective view of the connector provided in an embodiment of this disclosure; Figure 4 This is a front view of the elastic element in contact with the bellows during deformation, as provided in an embodiment of this disclosure.

[0023] In the picture: 1. Male connector; 10. Limiting ring; 11. Corrugated tube; 12. Slot; 2. Connecting female head; 20. Extension tube; 21. Elastic element; 22. Anti-slip toothed surface; 23. Guide cone surface; 24. Quick-connect claw; 25. Sealing ring. Detailed Implementation

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] Research has revealed that, as heavy-duty engineering machinery, the pneumatic braking system and pneumatic control pipelines of tractor trucks are core components ensuring safe vehicle operation. The reliability of pipeline joints directly affects the vehicle's braking performance and driving safety. Currently, most tractor truck pneumatic pipelines utilize quick-connect couplings for rapid assembly and maintenance. These couplings mainly consist of a male connector and a female connector. Connection is achieved by inserting the male connector into the female connector and locking it with internal claws, offering convenient assembly and reliable sealing.

[0030] However, in practical applications, existing quick-connect couplings have the following technical defects: Sudden changes in flow velocity can cause joint loosening. When the tractor brakes, accelerates, or experiences sudden changes in operating conditions, the airflow velocity in the pneumatic pipeline will change drastically. Especially at the point where the inner diameter of the pipeline connected to the female and male connectors decreases, the airflow will impact the inner wall of the connecting pipeline when passing through the male and female connectors, generating axial impact force. Long-term impact can easily lead to failure of the connector claws, loosening or even separation of the male and female connectors, causing air pressure leakage, directly affecting the performance of the braking system, and posing a serious safety hazard. Traditional quick-connect couplings lack an active anti-disengagement mechanism. Existing quick-connect couplings rely solely on the passive locking of the claws, which cannot actively enhance the connection strength under sudden changes in airflow impact force and vibration load, making it difficult to meet the reliability requirements of tractor vehicles under complex working conditions. Threaded connections cannot meet the needs of the scenario. Although traditional threaded connections can improve the static connection strength, they have problems such as low assembly and maintenance efficiency, large space occupation, and poor vibration resistance, which cannot meet the needs of compact layout and rapid maintenance of tractor vehicles.

[0031] Therefore, developing a quick-connect pipe connection device that can actively resist airflow impact and vibration load and prevent joint detachment has become an urgent technical problem to be solved in this field.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] like Figures 1 to 4As shown, at least one embodiment provides a pipeline connection device for a tractor, comprising two main bodies: a male connector 1 and a female connector 2, which are quick-connect fitting structures. The extension tube 20 of the female connector 2 can be inserted into the male connector 1 to form an axial fit. The corrugated tube 11 and the limiting ring 10 inside the male connector 1 work together with the elastic element 21 on the outer wall of the extension tube 20 to form a working condition-triggered anti-disengagement locking mechanism. The quick-connect claw 24 and the slot 12 achieve initial locking, and the sealing ring 25 achieves sealing. All components work together to complete the pipeline connection, anti-disengagement, and sealing functions. In this embodiment, both the male connector 1 and the female connector 2 are made of aluminum alloy (meeting the industry requirements for lightweight and corrosion-resistant tractor vehicles). The overall outer diameter is adapted to the φ16mm pipeline commonly used in the air pressure braking system of tractor vehicles, and the inner wall diameter is adapted to the flow requirements of air pressure transmission.

[0036] like Figure 2 The male connector 1 is an integral tubular structure. Near its end, an annular retaining ring 10 is integrally formed inside. The inner diameter of the retaining ring 10 is slightly larger than the outer diameter of the extension tube 20, ensuring smooth axial sliding of the extension tube 20. The end wall of the retaining ring 10 is planar, serving as the contact and limiting reference for the elastic element 21. On the side of the retaining ring 10 facing the inside of the male connector 1, a corrugated tube 11 with an annular corrugated structure integrally formed with the inner wall of the male connector 1 is provided. The crests and troughs of the corrugated tube 11 are alternately distributed axially, with an axial spacing of 6mm between the crests and troughs (within the limited range of 5-8mm). The height of the crest is 2mm, the depth of the trough is 2mm, and the effective length of the corrugated tube 11 is 30mm, ensuring sufficient contact space when the elastic element 21 deforms. The inner wall of the corrugated tube 11 has a rough surface, enhancing the meshing friction with the anti-slip teeth 22 of the elastic element 21. Figure 2 In this context, F1 indicates the direction of airflow.

[0037] Reference Appendix Figure 2 The outer wall of the end of the male connector 1 is provided with several slots 12 (evenly distributed in the circumferential direction) along the axial direction. The slots 12 are rectangular groove structures with an axial length of 10mm, a groove depth of 2mm, and a groove width of 3mm. One end of the slot 12 is a closed end, and the other end is an open end, which is adapted to the engagement and axial movement requirements of the quick-connect claw 24.

[0038] like Figure 3 The female connector 2 has a stepped tubular structure with a quick-connect interface at its front end. An extension tube 20 (integrated with the female connector 2) is coaxially fixed inside. The outer diameter of the extension tube 20 is smaller than the inner diameter of the male connector 1, forming an airflow contraction section to achieve airflow contraction and guidance. The effective insertion length of the extension tube 20 is 25mm, ensuring that after insertion into the corrugated tube 11 of the male connector 1, the elastic element 21 can effectively abut against the end wall of the limiting ring 10.

[0039] Continue to refer to the appendix Figure 3 Eight arc-shaped elastic elements 21 are evenly distributed circumferentially on the outer wall of the extension tube 20 (the included angle between adjacent elastic elements is 45°, within the range of 6-10 elements and 36-60°). The elastic elements 21 are made of 65Mn spring steel (possessing excellent elasticity and fatigue resistance), and have an axial length of 20mm (within the range of 15-25mm, and greater than the axial spacing of the crests and troughs of the bellows 11 by 6mm). One end of the elastic element 21 is welded and fixed to the outer wall of the extension tube 20, and the other end extends along the axial direction of the connecting female head 2 to form a free end. The end of the free end is rounded to avoid scratching the limiting ring 10 and the inner wall of the bellows 11. The end face of the free end is flat and can tightly abut against the end wall of the limiting ring 10. The outer surface (arc-shaped outer side) of the elastic element 21 is machined with anti-slip teeth 22. The tooth pitch of the anti-slip teeth 22 is 1.5mm and the tooth height is 0.5mm. The tooth shape is adapted to the crest curvature of the bellows 11 to ensure that when the elastic element 21 deforms radially, the anti-slip teeth 22 can fully engage with the crest of the inner wall of the bellows 11 to form a mechanical lock.

[0040] like Figure 3 The free end of the extension tube 20 is machined with a guide cone surface 23. In this embodiment, the cone angle of the guide cone surface 23 is 45° (within the limited range of 30-60°), and the surface roughness is Ra1.6. This ensures smooth flow when high-speed airflow passes through, converting the radial impact force of the airflow into an axial thrust that pushes the extension tube 20 away from the male connector 1. The inner wall of the quick-connect interface of the female connector 2, corresponding to the slot 12 of the male connector 1, has several integrally formed quick-connect claws 24 with elastic metal claw structures (integrated with the female connector 2, made of aluminum alloy, and possessing elastic recovery characteristics). The axial length of the quick-connect claws 24 is 8mm (less than the axial length of the slot 12, which is 10mm), and the protrusion height of the claws is 2mm, matching the depth of the slot 12. The end of the quick-connect claw 24 is an arc-shaped guide surface, which facilitates the guidance when the male connector 1 is inserted. The inner end wall of the claw is flat, so after insertion, it can tightly abut against the inner wall of the closed end of the slot 12 to achieve initial locking. Inside the quick-connect interface of the female connector 2, a hollow rubber sealing ring 25 is embedded. The outer wall of the sealing ring 25 abuts against the end of the male connector 1. When the male connector 1 and the female connector 2 are quickly connected, the sealing ring 25 abuts tightly against the end wall of the male connector 1 to achieve a high airtightness sealing effect. The hollow structure can increase the compression deformation of the sealing ring and enhance the sealing reliability.

[0041] The working principle of the pipeline connection device for tractor vehicles is as follows: The extension tube 20 of the female connector 2 and the limiting ring 10 of the male connector 1 are in a clearance fit. The extension tube 20 can reciprocate along the axial direction of the limiting ring 10, with a sliding stroke of 2mm (determined by the difference in axial length between the slot 12 and the quick-connect claw 24). This stroke satisfies the requirement of deformation locking of the elastic element 21 while preventing structural disengagement due to excessive sliding. At the same time, when the extension tube 20 reciprocates along the axial direction of the limiting ring 10, the end of the male connector 1 deforms due to the pressure sealing ring 25, thereby ensuring the airtightness between the male connector 1 and the female connector 2.

[0042] In the initial locking state, the quick-release claw 24 engages within the slot 12, with its end wall abutting against the closed end of the slot 12, achieving initial locking; as... Figure 4 When the working condition changes abruptly, the extension tube 20 drives the elastic element 21 to slide axially (during this axial movement, although the female connector 2 moves axially away from the male connector 1, the airtightness between the male connector 1 and the female connector 2 is ensured by the synchronous elastic deformation of the hollow sealing ring 25). The free end of the elastic element 21 is limited by the limiting ring 10 and cannot continue to move axially. It then opens outward radially (the deformation direction of the arc-shaped spring) until the anti-slip teeth 22 on the outer surface of the elastic element 21 completely engages with the crest of the bellows 11, forming an anti-disengagement lock. The axial length of the elastic element 21 is 20mm, which ensures that it completely contacts at least one crest of the bellows 11 when it deforms. Figure 4 F1 indicates the direction of airflow.

[0043] The sealing relationship is such that the hollow sealing ring 25 and the end wall of the male connector 1 form the first seal, and the outer wall of the male connector 1 and the inner wall of the female connector 2 form the second seal. The double sealing structure effectively prevents air pressure leakage and meets the sealing requirements of the tractor's air pressure braking system.

[0044] Reset engagement relationship: When the airflow velocity returns to a stable state, the axial thrust disappears. The elastic element 21, relying on the elastic force of the 65Mn spring steel, retracts radially inward to reset, and the reset elastic force of the sealing ring 25 drives the extension tube 20 to slide axially in the opposite direction until the quick-connect claw 24 abuts against the closed end of the slot 12 again. The free end of the elastic element 21 returns to the initial abutment state with the end wall of the limit ring 10, preventing disengagement and unlocking. The entire reset process is completed without manual intervention, relying on the characteristics of the components themselves.

[0045] At least one embodiment provides a method for operating a pipeline connection device for a tractor, the method comprising the following steps: Step 1: Align the end of the male connector 1 with the interface of the female connector 2, apply axial thrust to make the male connector 1 and the female connector 2 quick-connect, the extension tube 20 inside the female connector 2 is inserted into the bellows 11 of the male connector 1, the free end of the elastic element 21 abuts against the end wall of the limiting ring 10, and at the same time the quick-connect claw 24 engages with the annular groove 12 to complete the initial connection and sealing; Step 2: When the airflow is stable under normal operating conditions of the tractor, the elastic element 21 remains in its initial state, and the airflow passes smoothly after being guided by the guide cone surface 23 of the extension pipe 20. Step 3: When the tractor brakes, accelerates, or the working condition changes suddenly, causing the airflow velocity in the pipeline to increase instantaneously, the high-speed airflow impacts the guide cone surface 23 of the extension pipe 20, generating an axial thrust that pushes the extension pipe 20 to slide away from the connecting male head 1. Step 4: During the sliding process of the extension tube 20, the elastic element 21 undergoes elastic deformation, and the arc-shaped spring sheet opens outward. The anti-slip teeth 22 on its outer surface engage and abut with the crests of the corrugated tube 11, forming a mechanical lock to prevent the male connector 1 from separating from the female connector 2. Step 5: When the airflow velocity in the pipeline returns to a stable state, the elastic element 21 resets under its own elastic force, the extension tube 20 returns to its initial position, and the anti-disengagement locking state is unlocked.

[0046] 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.

[0047] 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.

[0048] 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 pipe connection device for a tractor, characterized in that, include: Connecting male connector (1) and connecting female connector (2), the connecting male connector (1) and connecting female connector (2) are quick-connect type, and the connecting female connector (2) is provided with an extension tube (20) that can be inserted into the connecting male connector (1). The extension tube (20) has a plurality of elastic elements (21) evenly distributed around its outer wall, and the elastic elements (21) extend along the axial direction; The male connector (1) is provided with a corrugated tube (11) and a limiting ring (10) inside. When the extension tube (20) is inserted into the corrugated tube (11), the outer end of the elastic element (21) abuts against the end wall of the limiting ring (10). When the airflow velocity in the pipeline increases instantaneously, the airflow pushes the extension pipe (20) to slide axially away from the connecting male head (1). The outer end of the elastic element (21) is limited by the limiting ring (10) and undergoes elastic deformation in the radial direction, so that the elastic element (21) abuts against the inner wall of the corrugated pipe (11) section to form an anti-disengagement lock.

2. The pipeline connection device for a tractor as described in claim 1, characterized in that, The elastic element (21) is an arc-shaped spring sheet. One end of the elastic element (21) is fixed to the outer wall of the extension tube (20), and the other end extends along the axial direction of the connecting head (2) to form a free end. The free end is adapted to abut against the end face of the limiting ring (10).

3. The pipeline connection device for a tractor as described in claim 2, characterized in that, The outer surface of the elastic element (21) is provided with anti-slip teeth (22), which are adapted to the crests of the corrugated pipe (11) section. When the elastic element (21) deforms, the anti-slip teeth (22) engage and lock with the inner wall of the corrugated pipe (11).

4. The pipeline connection device for a tractor as described in claim 3, characterized in that, The corrugated pipe (11) is an annular corrugated structure integrally formed on the inner wall of the male connector (1). The peaks and valleys of the corrugated structure are alternately distributed along the axial direction, and the axial distance between the peaks and valleys is 5-8 mm, which is used to form multi-point contact with the deformed part of the elastic element (21).

5. The pipeline connection device for a tractor as described in claim 1, characterized in that, The inner diameter of the extension tube (20) is smaller than the inner diameter of the pipe connecting the male connector (1), forming an airflow contraction section. The end of the extension tube (20) is provided with a guide cone surface (23), and the cone angle of the guide cone surface (23) is 30-60°.

6. The pipeline connection device for a tractor as described in claim 4, characterized in that, The axial length of the elastic element (21) is 15-25mm, which is greater than the axial distance between adjacent peaks and valleys inside the bellows (11); when the elastic element (21) deforms, the outer wall of the elastic element (21) abuts against at least one peak of the inner wall of the bellows (11).

7. The pipeline connection device for a tractor as described in claim 1, characterized in that, The outer wall of the end of the male connector (1) is provided with several slots (12) along the axial direction. The inner wall of the female connector (2) is provided with a quick-connect claw (24) that is adapted to the slot (12). The quick-connect claw (24) is an elastic metal claw structure. After being inserted, it engages with the slot (12) to achieve the initial locking of the male connector (1) and the female connector (2).

8. The pipeline connection device for a tractor as described in claim 7, characterized in that, The axial length of the slot (12) is greater than the axial length of the quick-connect claw (24). When the male connector (1) and the female connector (2) are plugged into each other, the end wall of the quick-connect claw (24) abuts against the inner wall of one end of the slot (12).

9. The pipeline connection device for a tractor as described in claim 1, characterized in that, The number of elastic elements (21) is 6-10, and they are evenly distributed along the circumference of the extension tube (20). The included angle between adjacent elastic elements (21) is 36-60° to ensure that the elastic elements (21) are subjected to uniform force with the inner wall of the corrugated tube (11) when they deform.

10. The pipeline connection device for a tractor as described in claim 1, characterized in that, A sealing ring (25) is provided inside the female connector (2). The sealing ring (25) is hollow inside and abuts against the end wall of the male connector (1).

11. A method for operating a pipeline connection device for a tractor, characterized in that, The working method of the tractor piping connection device according to any one of claims 1-10 includes the following steps: Step 1: Align the end of the male connector (1) with the interface of the female connector (2), apply axial thrust to make the male connector (1) and the female connector (2) quick-connect fit, insert the extension tube (20) inside the female connector (2) into the bellows (11) of the male connector (1), the free end of the elastic element (21) abuts against the end wall of the limiting ring (10), and at the same time the quick-connect claw (24) engages with the annular groove (12) to complete the initial connection and sealing; Step 2: When the airflow is stable under normal operating conditions of the tractor, the elastic element (21) remains in its initial state, and the airflow passes smoothly after being guided by the guide cone surface (23) of the extension pipe (20); Step 3: When the tractor brakes, accelerates, or the working condition changes suddenly, causing the airflow velocity in the pipeline to increase instantaneously, the high-speed airflow impacts the guide cone surface (23) of the extension pipe (20), generating an axial thrust that pushes the extension pipe (20) to slide away from the connecting male (1); Step 4: During the sliding process of the extension tube (20), the elastic element (21) undergoes elastic deformation, the arc-shaped spring sheet opens outward, and the anti-slip teeth (22) on its outer surface engages with the crests of the corrugated tube (11) to form a mechanical lock, preventing the male connector (1) from separating from the female connector (2). Step 5: When the airflow velocity in the pipeline returns to a stable state, the elastic element (21) resets under its own elastic force, the extension tube (20) returns to its initial position, and the anti-disengagement locking state is unlocked.

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