Anti-falling quartered tooth joint

Abstract

The invention relates to the technical field of connecting pieces, in particular to an anti-falling quartered tooth connector which comprises a body and is characterized in that an external thread section is arranged at one end of the body, an internal thread section is arranged at the other opposite end of the body, a fixing sleeve fixedly sleeves the outer circumferential surface of the external thread section, a rotating ring is coaxially and rotationally connected to the outer side of the fixing sleeve, and first oblique teeth are arranged on the inner wall of the rotating ring; second helical teeth meshed with the first helical teeth are arranged on the outer wall of the fixing sleeve, the outer side of the rotating ring is fixedly connected with a clamping assembly, the clamping assembly comprises symmetrically-arranged buckling arms and a limiting ring connected to the top ends of the two buckling arms, anti-skid insections are arranged on the inner wall of the limiting ring, and the limiting ring is elastically connected with the rotating ring through a spring piece. A limiting assembly is further arranged between the fixing sleeve and the rotating ring and comprises an annular flange fixed to the end face of the fixing sleeve and an annular groove formed in the inner wall of the rotating ring, the annular flange is embedded into the annular groove and can axially slide, and a locking block is further arranged on the outer wall of the rotating ring and matched with a wedge-shaped groove in the outer wall of the fixing sleeve.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of connecting pieces, and particularly relates to a falling-prevention 1 / 4" screw joint. BACKGROUND

[0002] The 1 / 4" screw joint is a standard screw connecting piece widely used in the fields of hydraulic, pneumatic, pipeline connection and the like, and its name is derived from the English unit "1 / 4 inch". The joint is mainly used for quick connection of a fluid conveying system, has the advantages of simple structure, convenient disassembly and assembly and the like, and is widely applied to the fields of industrial equipment, automobile manufacturing, agricultural machinery and the like.

[0003] Although the 1 / 4" screw joint is widely used in engineering applications, the prior art still has the following main defects, which lead to easy loosening or falling of the joint in a vibration, impact or long-term use environment. The traditional 1 / 4" screw joint mainly relies on the pre-tightening force of the screw thread and the sealing glue / raw material belt to enhance the friction, but when the high-frequency vibration or temperature change occurs, the screw thread pair is prone to fretting wear, which leads to a decrease in the pre-tightening force and finally loosens. Some improved schemes adopt a locking nut or a spring washer, but these structures need an additional tool for locking, and are prone to failure after being disassembled and assembled for many times. In addition, a patent proposes an elastic clamping jaw or a conical surface locking structure, but has the problems of large installation space and poor compatibility, and is difficult to adapt to connecting pieces of different specifications. SUMMARY

[0004] The application provides a falling-prevention 1 / 4" screw joint to solve the technical problems of loosening of the above-mentioned 1 / 4" screw joint and large installation space.

[0005] The technical scheme adopted by the application is as follows: A falling-prevention 1 / 4" screw joint, comprising a body, characterized in that: one end of the body is provided with an external thread segment, and the opposite end is provided with an internal thread segment; a fixing sleeve is fixedly sleeved on the outer circumferential surface of the external thread segment; a rotating ring is coaxially rotatably connected to the outside of the fixing sleeve; a first bevel gear is arranged on the inner wall of the rotating ring; a second bevel gear is arranged on the outer wall of the fixing sleeve and meshes with the first bevel gear; a clamping assembly is fixedly connected to the outside of the rotating ring, and the clamping assembly comprises symmetrically arranged clamping arms and a limiting ring connected to the top ends of the clamping arms; an anti-skid tooth pattern is arranged on the inner wall of the limiting ring; the limiting ring is elastically connected to the rotating ring through a spring sheet; a limiting assembly is further arranged between the fixing sleeve and the rotating ring; the limiting assembly comprises an annular flange fixed to the end surface of the fixing sleeve and an annular groove in the inner wall of the rotating ring; the annular flange is embedded in the annular groove and can axially slide; a locking block is further arranged on the outer wall of the rotating ring; and the locking block cooperates with a wedge-shaped groove in the outer wall of the fixing sleeve, and when the rotating ring is rotated to a locking position, the locking block is clamped into the wedge-shaped groove.

[0006] By adopting the technical scheme, the first bevel gear is arranged on the inner wall of the rotating ring and is in close cooperation with the second bevel gear machined on the outer wall of the fixing sleeve. Through the cooperation of the bevel gears, the rotational movement is converted into an axial pushing force, so that the fixing sleeve is uniformly and continuously displaced on the body. Compared with the simple screw movement adjustment mode in the prior art, the present application realizes smooth force transmission during the pre-tightening process through the cooperation of the bevel gears, avoids the problems of uneven wear or excessive gap possibly caused by single thread transmission, and thus guarantees the reliable combination of the assembly parts for a long time.

[0007] After the pre-tightening adjustment is completed, the rotating ring continues to rotate, the locking block is precisely cooperated with the wedge-shaped groove on the outer wall of the fixing sleeve, and the self-locking effect is realized. Since the wedge-shaped groove has a tapered and transitional structure, the self-locking effect generated after the locking block enters can prevent the rotation or loosening under the external vibration condition. In this way, the mechanical connection during operation is guaranteed not to be loosened due to long-time vibration, and the gap change caused by vibration is reduced, so that the stability of the overall transmission system is maintained.

[0008] Optionally, the fixing sleeve and the joint body are fixedly connected through a radial pin, the pin penetrates the fixing sleeve and is embedded in the body.

[0009] By adopting the technical scheme, the fixing sleeve and the body are connected through a radial pin, and an annular groove is arranged on the body, so that the fixing sleeve is anchored at multiple positions. This multi-point connection mode ensures that the parts are not easily displaced in the axial or radial directions after installation, and can resist the positional deviation caused by vibration more than the traditional single positioning mode. This design can make the entire joint maintain high stability in a vibration and impact environment, and provides a solid foundation for subsequent operation and locking.

[0010] Optionally, a guide groove is arranged at the root of the buckle arm, a guide column is slidably connected in the guide groove, and the guide column is fixed to the outer side wall of the rotating ring.

[0011] By adopting the technical scheme, the buckle arm is provided with a guide groove matched with the guide column fixed to the outer side of the rotating ring, the movement path of the limiting ring is controlled through the sliding cooperation, and the parts are always coaxial and coplanar during the operation process. This design not only effectively avoids the clamping disorder caused by mispositioning, but also ensures the accurate coordination between the mechanical parts in high-frequency repeated operation, and improves the assembly stability during long-term use.

[0012] Optionally, the number of spring sheets is two groups, which are distributed in the circumferential direction of the limiting ring. The spring sheet is an arc-shaped stainless steel sheet, one end of which is welded to the outer wall of the rotating ring, and the other end is welded to the inner wall of the limiting ring.

[0013] By adopting the technical scheme, the elastic connection between the limiting ring and the rotating ring is realized by the arc-shaped stainless steel spring sheet, and in the mechanical operation process, this return mechanism can automatically eliminate the instantaneous displacement caused by external disturbance force and restore to the accurate position at the end of rotation. Compared with the rigid connection that can be used in the prior art, such elastic design not only ensures the fault tolerance of the system in the operation process, but also effectively relieves the impact energy in the high-vibration and impact environment and reduces the damage risk of each component caused by hard impact.

[0014] Optionally, the inner threaded segment end of the joint body is provided with a guide surface.

[0015] By adopting the technical scheme, the guide surface at the end of the inner threaded segment is pre-guided to realize automatic centering when the connecting piece is inserted, and to reduce the jamming phenomenon caused by initial imperfect butt joint.

[0016] Optionally, the outer wall of the fixing sleeve is provided with an annular sealing groove, and a rubber sealing ring is embedded in the sealing groove.

[0017] By adopting the technical scheme, the annular sealing groove on the outer wall of the fixing sleeve cooperates with the rubber sealing ring to form a continuous sealing channel, which can effectively prevent medium leakage caused by the small gap at the connecting joint. In the traditional technology, sealing often depends on subsequent glue coating or embedded sealing. This design realizes the sealing requirement of the structure itself through the early processing precision, so that the whole joint can maintain high sealing efficiency during long-term service.

[0018] Optionally, the annular flange end surface of the limiting assembly is provided with a ball groove, and a ball is embedded in the ball groove, and the ball is in rolling contact with the inner wall of the annular groove.

[0019] By adopting the technical scheme, the ball provided in the limiting assembly forms continuous rolling contact with the annular groove. This low-friction contact mechanism not only makes the axial sliding process smoother, but also disperses the load transmission and reduces the local wear caused by single-point stress concentration. Compared with the traditional direct surface contact and friction design, this design undoubtedly has higher wear resistance and stability in long-term and high-frequency vibration environment, thereby prolonging the service life of the joint device.

[0020] Optionally, the inner side of the buckle arm is provided with a reinforcing rib.

[0021] By adopting the technical scheme, As a result of adopting the technical scheme, the application has the following beneficial effects: 1、The present application sets up outer thread section and inner thread section on the body at the same time, and fixes the fixed sleeve on the outer wall of the outer thread section, and realizes the oblique tooth meshing and mechanical limiting through the coaxial installation of the rotating ring and the clamping assembly, so that the whole joint forms a multi-point locking, complementary anti-loose overall system, which ensures the closer cooperation between the parts, thereby greatly improving the assembly stability, and avoiding the uneven local stress problem that may exist in the traditional single-point fixing; 2、The first oblique tooth is arranged on the inner wall of the rotating ring, and the second oblique tooth is arranged on the outer wall of the fixed sleeve, and the first oblique tooth and the second oblique tooth are in close cooperation, and the rotation is converted into axial pushing force through the meshing of the oblique teeth, so that the fixed sleeve realizes uniform and continuous displacement on the body, compared with the simple screw motion adjustment mode in the prior art, the present application realizes stable force transmission in the pre-tightening process through the meshing of the oblique teeth, avoids the problem of uneven wear or excessive gap caused by single thread transmission, and thus guarantees the reliable combination between the assembled parts for a long time; 3、The clamping arm is provided with a guide groove matched with the guide column fixed on the outer side of the rotating ring, and the movement path of the limiting ring is controlled through sliding cooperation, so that the coaxiality and coplanarity of the parts are always maintained during the operation process, which not only effectively avoids the clamping disorder caused by mispositioning, but also ensures the accurate coordination between mechanical parts in high-frequency repeated operation, and improves the assembly stability during long-term use; 4、After completing the pre-tightening adjustment, the rotating ring continues to rotate, the locking block is precisely matched with the wedge-shaped groove on the outer wall of the fixed sleeve, and the self-locking effect is realized, since the wedge-shaped groove has a tapered and transitional structure, the self-locking effect generated after the locking block enters can prevent rotation or loosening under external vibration conditions, so that the mechanical connection during operation cannot be loosened due to long-term vibration, and the gap change caused by vibration is also reduced, thereby maintaining the stability of the overall transmission system. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings described herein are used to provide further understanding of the present application, and constitute a part of the present application, the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings: Figure 1 It is a four-part tooth joint three-dimensional schematic view of the present application; Figure 2 It is a four-part tooth joint sectional view of the present application; Figure 3 It is a four-part tooth joint three-dimensional schematic view of the present application; Figure 2 It is a four-part tooth joint three-dimensional schematic view of the present application; Figure 4 It is a four-part tooth joint three-dimensional schematic view of the present application; Figure 5 It is a four-part tooth joint three-dimensional schematic view of the present application; Figure 6 It is one kind of anti-drop four tooth connection fixed sleeve, rotating ring front view for the application.

[0023] 1, the body; 2, fixed sleeve; 21, second bevel gear; 3, rotating ring; 31, first bevel gear; 4, clamping assembly; 41, buckle arm; 42, limit ring; 5, spring piece; 6, limit assembly; 61, annular flange; 62, annular groove; 7, locking block; 8, wedge groove; 9, pin; 10, guide groove; 11, guide column; 12, guide surface; 13, sealing ring; 14, ball; 15, reinforcing rib. DETAILED DESCRIPTION

[0024] In order to more clearly illustrate the overall concept of the application, the following will be described in detail with reference to the accompanying drawings.

[0025] In the following description, a lot of specific details are set forth in order to fully understand the application, however, the application can also be implemented in other ways different from the description herein, therefore, the protection scope of the application is not limited by the specific embodiments disclosed below. It should be noted that the embodiments of the application and the features in each embodiment can be combined with each other without conflict.

[0026] An anti-drop four tooth connection, comprising a body 1, characterized in that: the body 1 is provided with an external thread segment at one end, and an internal thread segment at the opposite end, the outer circumferential surface of the external thread segment is fixedly connected with a fixed sleeve 2, the outer side of the fixed sleeve 2 is coaxially connected with a rotating ring 3, the inner wall of the rotating ring 3 is provided with a first bevel gear 31, the outer wall of the fixed sleeve 2 is provided with a second bevel gear 21 meshing with the first bevel gear 31, the outer side of the rotating ring 3 is fixedly connected with a clamping assembly 4, the clamping assembly 4 comprises symmetrically arranged buckle arms 41 and a limit ring 42 connected to the top ends of the two buckle arms 41, the inner wall of the limit ring 42 is provided with anti-skid teeth, the limit ring 42 is elastically connected with the rotating ring 3 through a spring piece 5, the fixed sleeve 2 and the rotating ring 3 are further provided with a limit assembly 6, the limit assembly 6 comprises an annular flange 61 fixed on the end face of the fixed sleeve 2 and an annular groove 62 on the inner wall of the rotating ring 3, the annular flange 61 is embedded in the annular groove 62 and can axially slide, the outer wall of the rotating ring 3 is further provided with a locking block 7, the locking block 7 cooperates with a wedge groove 8 on the outer wall of the fixed sleeve 2, when the rotating ring 3 rotates to a locking position, the locking block 7 is clamped into the wedge groove 8.

[0027] When installing, the user first tightens and fixes the external thread segment with the specified pipe or fitting, since the guide surface 12 at the end of the internal thread segment is pre-guided, automatic centering during insertion of the connecting piece is achieved, reducing the jamming phenomenon caused by initial misalignment.

[0028] In other embodiments, the fixing sleeve 2 remains fixedly installed at the end of the connector body 1. Besides the necessary sealing grooves machined on its outer wall, one or more tapered bosses extending in a conical shape are machined at appropriate positions. The fixing sleeve 2 is directly fixed to the body 1 by radial pins 9 or other fixing methods. This component serves as a relatively stationary base platform. The rotating ring 3 is still installed on the outside of the fixing sleeve 2, but its inner wall has tapered grooves that match the tapered bosses of the fixing sleeve 2 in corresponding areas. The fit between the tapered grooves and the tapered bosses generates a significant axial thrust when the rotating ring 3 rotates, causing the fixing sleeve 2 to move axially along the body 1, thereby achieving pre-tightening and locking. The rotating ring 3 is coaxially fitted onto the outside of the fixing sleeve 2, achieving smooth rotation through bearings or sliding fits. The groove positions are opposite to the tapered bosses on the fixing sleeve 2, and are evenly distributed throughout the entire circumference.

[0029] In other embodiments, a set of elastic retaining rings is provided on the outer side of the rotating ring 3, one end of which is fixed to the outer wall of the rotating ring 3, and the other end is connected to the auxiliary locking ring. The inner side of the auxiliary locking ring has a set of protrusions or teeth, which cooperate with the corresponding grooves on the outer wall of the fixed sleeve 2. When the rotating ring 3 rotates to a predetermined position, the protrusions of the auxiliary locking ring engage with the grooves on the fixed sleeve 2, achieving secondary mechanical locking. The elastic retaining rings are fixed to the rotating ring 3, and the auxiliary locking ring is installed on the outer side of the rotating ring 3, forming a contact interface with the outer wall of the fixed sleeve 2. The two are elastically connected, ensuring reset while preventing loosening due to vibration.

[0030] Furthermore, the fixing sleeve 2 and the connector body 1 are fixedly connected by a radial pin 9, which passes through the fixing sleeve 2 and is embedded in the body 1.

[0031] In this embodiment, the fixed sleeve 2 is a regular cylinder. Its outer wall is machined with evenly distributed annular sealing grooves according to the requirements of this embodiment. A rubber sealing ring 13 is embedded in the sealing groove to ensure good sealing between the fixed sleeve 2 and other components. The inner side of the fixed sleeve 2 is fixed to the body 1 by a radial pin 9. The pin 9 is made of high-strength stainless steel to ensure that one end of the pin 9 penetrates the fixed sleeve 2.

[0032] During installation, the fixing sleeve 2 is heated to 200℃ and then fitted onto the external thread section. After cooling, an interference fit is formed. The radial pin 9 is driven vertically into the side wall of the fixing sleeve 2, penetrating to the body 1. The head of the pin 9 is recessed into the surface of the fixing sleeve 2 to avoid interfering with the rotation of the rotating ring 3. When the rotating ring 3 drives the helical teeth to engage, the fixing sleeve 2 is subjected to circumferential shear force. The pin 9 resists this force through its shear strength, preventing the fixing sleeve 2 from rotating relative to the connector body 1.

[0033] Furthermore, the base of the buckle arm 41 is provided with a guide groove 10, and a guide post 11 is slidably connected in the guide groove 10. The guide post 11 is fixed on the outer wall of the rotating ring 3.

[0034] When the rotating ring 3 rotates, the guide post 11 moves along the guide groove 10, forcing the latching arm 41 to retract along a predetermined path, ensuring that the limiting ring 42 evenly presses the connecting piece. If the guide post 11 breaks, the spring plate 5 can still maintain part of the clamping force through elastic deformation.

[0035] Furthermore, there are two sets of spring plates 5, distributed circumferentially along the limiting ring 42. The spring plates 5 are arc-shaped stainless steel plates, with one end welded to the outer wall of the rotating ring 3 and the other end welded to the inner wall of the limiting ring 42.

[0036] When the limiting ring 42 is connected to the component, the central part of the spring plate 5 undergoes elastic bending, storing potential energy. If there is a tolerance in the outer diameter of the connecting component, the spring plate 5 can be additionally compressed to compensate. The welding of the spring plate 5 to the rotating ring 3 and the limiting ring 42 is carried out by laser spot welding to avoid the heat-affected zone reducing the elasticity of the stainless steel.

[0037] Furthermore, the end of the internal thread section of the connector body 1 is provided with a guide surface 12.

[0038] When the externally threaded pipe fitting on the other side is screwed into the internally threaded section, the guide surface 12 guides the starting end of the thread to be aligned, reducing the risk of misalignment. The guide surface 12 and the end face of the connecting pipe fitting form a wedge-shaped space, which can be filled with sealant to enhance the sealing performance.

[0039] Furthermore, the outer wall of the fixing sleeve 2 is provided with an annular sealing groove, and a rubber sealing ring 13 is embedded in the sealing groove.

[0040] After the rubber sealing ring 13 is installed into the sealing groove, its outer diameter extends above the bottom of the groove. When the rotating ring 3 is assembled, the sealing ring 13 is compressed, forming a radial seal. The sealing ring 13 prevents external dust and moisture from entering the helical tooth meshing area, preventing tooth surface corrosion or jamming.

[0041] Furthermore, the end face of the annular flange 61 of the limiting component 6 is provided with a ball 14 groove, in which a ball 14 is embedded, and the ball 14 rolls in contact with the inner wall of the annular groove 62.

[0042] The inner wall of the annular groove 62 is machine-hardened, and the balls 14 roll freely within the groove. When the rotating ring 3 moves axially, the balls 14 convert sliding friction into rolling friction. The groove of the balls 14 is filled with lithium-based grease to further reduce frictional resistance.

[0043] Furthermore, the inner side of the buckle arm 41 is provided with reinforcing ribs 15.

[0044] Working principle: With the rotating ring 3 in the axially retracted position and the latching arm 41 open, the inner diameter of the limiting ring 42 is larger than the outer diameter of the connector. Align the external thread section with the internal thread hole of the connector and manually rotate the connector body 1 to screw the external thread section into the connector. At this time, the fixing sleeve 2 covers the root of the external thread section, and the rotating ring 3 and the latching assembly 4 are located on the outer side of the connector's outer wall. Rotating the rotating ring 3 clockwise causes the first helical tooth 31 to slide along the inclined surface of the second helical tooth 21, pushing the rotating ring 3 to move axially towards the connector. The axial movement of the rotating ring 3, through the cooperation of the guide post 11 and the guide groove 10, forces the latching arm 41 to retract in the axial direction, and the anti-slip teeth on the inner wall of the limiting ring 42 gradually press against the outer wall of the connector. When the rotating ring 3 rotates to its maximum stroke, the inclined surface of the locking block 7 slides into the wedge groove 8 of the fixing sleeve 2. The radial component force generated by the inclined surface makes the locking block 7 fit tightly against the inner wall of the wedge groove 8, forming a mechanical self-lock and preventing the rotating ring 3 from rotating in the opposite direction. After the annular flange 61 is embedded in the annular groove 62, it restricts the axial movement range of the rotating ring 3 and avoids excessive compression of the spring sheet 5.

[0045] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0046] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0047] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A type of anti-detachment four-point threaded connector, comprising a body (1), characterized in that: One end of the body (1) is provided with an external thread section, and the other end is provided with an internal thread section. A fixed sleeve (2) is attached to the outer circumference of the external thread section. A rotating ring (3) is coaxially rotatably connected to the outer side of the fixed sleeve (2). The inner wall of the rotating ring (3) is provided with a first helical tooth (31). The outer wall of the fixed sleeve (2) is provided with a second helical tooth (21) that meshes with the first helical tooth (31). A snap-fit ​​assembly (4) is fixedly connected to the outer side of the rotating ring (3). The snap-fit ​​assembly (4) includes symmetrically arranged snap-fit ​​arms (41) and a limiting ring (42) connected to the top of the two snap-fit ​​arms (41). The inner wall of the limiting ring (42) is provided with Anti-slip teeth, the limiting ring (42) is elastically connected to the rotating ring (3) through the spring sheet (5), and a limiting component (6) is also provided between the fixed sleeve (2) and the rotating ring (3). The limiting component (6) includes an annular flange (61) fixed on the end face of the fixed sleeve (2) and an annular groove (62) on the inner wall of the rotating ring (3). The annular flange (61) is embedded in the annular groove (62) and can slide axially. The outer wall of the rotating ring (3) is also provided with a locking block (7). The locking block (7) cooperates with the wedge groove (8) on the outer wall of the fixed sleeve (2). When the rotating ring (3) rotates to the locking position, the locking block (7) is inserted into the wedge groove (8).

2. The anti-detachment four-part threaded connector according to claim 1, characterized in that: The fixing sleeve (2) and the connector body (1) are fixedly connected by a radial pin (9), which passes through the fixing sleeve (2) and is embedded in the body (1).

3. The anti-detachment four-part threaded connector according to claim 1, characterized in that: The root of the buckle arm (41) is provided with a guide groove (10), and a guide post (11) is slidably connected in the guide groove (10). The guide post (11) is fixed on the outer wall of the rotating ring (3).

4. The anti-detachment four-part threaded connector according to claim 1, characterized in that: The spring sheet (5) consists of two sets, distributed circumferentially along the limiting ring (42). The spring sheet (5) is an arc-shaped stainless steel sheet, with one end welded to the outer wall of the rotating ring (3) and the other end welded to the inner wall of the limiting ring (42).

5. The anti-detachment four-part threaded connector according to claim 1, characterized in that: The end of the internal thread section of the connector body (1) is provided with a guide surface (12).

6. The anti-detachment four-point threaded joint according to claim 1, characterized in that: The outer wall of the fixed sleeve (2) is provided with an annular sealing groove, and a rubber sealing ring (13) is embedded in the sealing groove.

7. The anti-detachment four-part threaded connector according to claim 1, characterized in that: The end face of the annular flange (61) of the limiting component (6) is provided with a ball (14) groove, in which a ball (14) is embedded, and the ball (14) rolls in contact with the inner wall of the annular groove (62).

8. The anti-detachment four-part threaded connector according to claim 1, characterized in that: The inner side of the buckle arm (41) is provided with reinforcing ribs (15).

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