A quick sealing joint for a lubrication recovery duct of a conical twin-screw gearbox

Abstract

The utility model relates to the field of mechanical transmission system lubrication, concretely relates to a kind of quick sealing joint of conical double screw gear box lubrication recovery pipeline, including male joint assembly and female joint assembly, the male joint assembly is used to connect to the fixed end of conical double screw gear box lubrication recovery pipeline, the female joint assembly is used to connect to the movable end of lubrication system oil return pipeline, the male joint assembly includes gear box butt joint section and oil pipeline, one end of the gear box butt joint section is the conical structure that is adapted with gear box oil return port, the other end inner wall of the gear box butt joint section is fixedly connected with the one end of oil pipeline and is communicated, the female joint assembly includes pipeline connecting section, connecting pipe and sleeve. By adopting the combined connection mode of axial insertion and thread connection, it is not necessary to rely on multiple bolts or welding operation, only axial quick insertion is needed through sleeve guidance during connection, and then thread fastening is completed by simple screwing, to reduce equipment downtime.

Description

Technical Field

[0001] This utility model relates to the field of lubrication of mechanical transmission systems, specifically to a quick-sealing joint for a lubrication recovery pipeline of a conical twin-screw gearbox. Background Technology

[0002] Conical twin-screw extruders are widely used in industries such as plastics and chemicals. The core component, the conical twin-screw gearbox, generates a large amount of heat during operation. Due to the intense friction generated by the gears, bearings, and other components inside the gearbox under high-speed operation, a forced lubrication system is required to continuously supply lubricating oil to achieve cooling, lubrication, and friction reduction. After fulfilling its lubrication mission, the lubricating oil needs to flow back from the gearbox to the oil tank through the lubrication recovery pipeline. After filtration and cooling, it re-enters the circulation. Therefore, the stability, smoothness, and reliable sealing of the oil return pipeline directly affect the service life of the gearbox and the production continuity of the extruder.

[0003] In existing technologies, the return oil pipeline between the gearbox and the lubrication system is mostly connected by flanges or welded, which is complicated to disassemble and install and inconvenient to maintain. Especially during equipment maintenance, oil pipe replacement or debugging, it is necessary to stop the machine and drain the oil line before operation, which seriously affects production efficiency. Moreover, after repeated disassembly, the seal is prone to failure, resulting in lubricating oil leakage, which not only pollutes the environment but also poses safety hazards.

[0004] Therefore, it is necessary to invent a quick-sealing joint for the lubrication recovery pipeline of a conical twin-screw gearbox to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a quick-sealing connector for the lubrication recovery pipeline of a conical twin-screw gearbox. By adopting a combination of axial insertion and threaded connection, it can solve the problems of difficult assembly and disassembly, easy leakage and low maintenance efficiency of the lubrication return pipeline in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a quick-sealing connector for a conical twin-screw gearbox lubrication recovery pipeline, comprising a male connector assembly and a female connector assembly. The male connector assembly is used to connect to the fixed end of the conical twin-screw gearbox lubrication recovery pipeline, and the female connector assembly is used to connect to the movable end of the lubrication system return oil pipeline. The male connector assembly includes a gearbox mating section and an oil delivery pipeline. One end of the gearbox mating section has a conical structure adapted to the gearbox return oil port, and the inner wall of the other end of the gearbox mating section is fixedly connected to one end of the oil delivery pipeline. Furthermore, the female connector assembly includes a pipe connection section, a connecting pipe, and a sleeve. One end of the pipe connection section is used to connect to the return oil pipeline of the lubrication system. The other end of the pipe connection section is fixedly connected to and communicates with one end of the connecting pipe. The sleeve is coaxially and fixedly sleeved on the outer wall of the connecting pipe. The inner wall of the sleeve fits against the outer wall of the gearbox docking section. The end of the oil delivery pipeline away from the gearbox docking section is detachably connected to the end of the connecting pipe away from the pipe connection section by a thread. A sealing mechanism for enhancing sealing performance is provided at the mating point between the gearbox docking section and the sleeve.

[0007] Preferably, the inner wall of the connecting pipe at the end away from the pipe connection section is provided with an internal thread groove, and the outer wall of the oil pipeline at the end away from the gearbox docking section is provided with an external thread that matches the internal thread groove. The oil pipeline is threadedly connected to the internal thread groove of the connecting pipe through the external thread.

[0008] Preferably, the inner wall of the sleeve and the outer wall of the gearbox mating section are in transition fit, and the length of the sleeve is not less than the length of the gearbox mating section extending out of the oil pipeline.

[0009] Preferably, the sealing mechanism includes a fixing block, and an annular mounting groove is provided on the outer wall of the gearbox docking section. The fixing block is fixed to the inner wall of the annular mounting groove by a threaded connection.

[0010] Preferably, the fixing block has a cavity on the side near the sleeve, and a pressure ring is fitted on the inner wall of the cavity, the outer diameter of the pressure ring being adapted to the inner diameter of the cavity.

[0011] Preferably, the sealing mechanism further includes an elastic gasket and a sealing ring. One end of the elastic gasket is fixedly connected to the side of the pressure ring away from the fixed block, and the other end of the elastic gasket is fixedly connected to the side of the sealing ring near the pressure ring. The side of the sealing ring away from the elastic gasket is in contact with the inner wall of the sleeve.

[0012] Preferably, the pressure ring is elastically connected to the sealing ring via an elastic gasket, wherein the elastic gasket is made of oil-resistant engineering plastic and the sealing ring is made of fluororubber.

[0013] Preferably, the fixing block and the inner wall of the cavity are integrally formed, and the sealing ring is slidably disposed on the inner wall of the cavity along the axial direction of the cavity.

[0014] The technical effects and advantages provided by this utility model in the above technical solution are as follows: This utility model adopts a combination of axial insertion and threaded connection, eliminating the need for multiple bolts or welding operations. During connection, only a sleeve guide is needed to achieve axial quick insertion, and then the thread is tightened by simple screwing, reducing equipment downtime. Furthermore, during installation, the elastic gasket pushes the fluororubber sealing ring to generate radial compression deformation, sealing the gap between the sleeve and the gearbox mating section, maintaining sealing reliability even under vibration conditions generated during long-term equipment operation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0016] Figure 1 This is a three-dimensional structural diagram of the overall device in this utility model; Figure 2 This is a three-dimensional structural breakdown diagram of the present invention. Figure 3 This is a three-dimensional structural disassembly diagram of the male connector assembly and sealing mechanism in this utility model; Figure 4 This is a three-dimensional sectional view of the sealing mechanism in this utility model. Figure 5 This is a three-dimensional sectional view of the male connector assembly and the female connector assembly in this utility model.

[0017] Legend: 10. Male connector assembly; 101. Gearbox mating section; 1011. Annular mounting groove; 102. Oil pipeline; 1021. External thread; 20. Female connector assembly; 201. Pipe connection section; 202. Connecting pipe; 2021. Internal thread groove; 203. Sleeve; 30. Sealing mechanism; 301. Fixing block; 3011. Cavity; 302. Pressure ring; 303. Elastic gasket; 304. Sealing ring. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0019] This utility model provides, for example Figure 1 - Figure 3 The quick-sealing connector for a conical twin-screw gearbox lubrication recovery pipeline includes a male connector assembly 10 and a female connector assembly 20. The male connector assembly 10 is used to connect to the fixed end of the conical twin-screw gearbox lubrication recovery pipeline, and the female connector assembly 20 is used to connect to the movable end of the lubrication system return oil pipeline. The male connector assembly 10 and the female connector assembly 20 achieve quick connection and disconnection through axial insertion. In the connected state, a sealed oil passage is formed, and in the disconnected state, both oil ports can be automatically sealed to prevent lubricating oil leakage. The male connector assembly 10 includes a gearbox docking section 101 and an oil delivery pipeline 102. One end of the gearbox docking section 101 has a conical structure adapted to the gearbox return oil port, and the inner wall of the other end of the gearbox docking section 101 is fixedly connected and communicates with one end of the oil delivery pipeline 102, providing a main oil flow channel and... The precision thread enables reliable mechanical locking. The female connector assembly 20 includes a pipe connection section 201, a connecting pipe 202, and a sleeve 203. One end of the pipe connection section 201 is used to connect to the return oil line of the lubrication system. The other end of the pipe connection section 201 is fixedly connected to and communicates with one end of the connecting pipe 202. The sleeve 203 is coaxially fixedly sleeved on the outer wall of the connecting pipe 202. The inner wall of the sleeve 203 fits against the outer wall of the gearbox mating section 101. The end of the oil pipeline 102 away from the gearbox mating section 101 is detachably connected to the end of the connecting pipe 202 away from the pipe connection section 201 by a thread. A sealing mechanism 30 is provided at the mating point between the gearbox mating section 101 and the sleeve 203 to enhance the sealing performance, improve the sealing performance, compensate for possible minor leakage paths in the threaded connection, and improve the overall sealing level.

[0020] like Figure 1 , Figure 2 and Figure 5 As shown, the inner wall of the connecting pipe 202 away from the pipe connection section 201 has an internal thread groove 2021, and the outer wall of the oil pipeline 102 away from the gearbox docking section 101 has an external thread 1021 that matches the internal thread groove 2021. The oil pipeline 102 is threadedly connected to the internal thread groove 2021 of the connecting pipe 202 through the external thread 1021. The threaded connection provides high strength and pull-out resistance, which is suitable for large-diameter, high-pressure oil return systems and is superior to the snap-fit ​​quick-connect structure. The inner wall of the sleeve 203 and the outer wall of the gearbox docking section 101 are transition fit to ensure smooth sliding and avoid excessive gaps affecting sealing accuracy, thus improving connection consistency. In addition, the length of the sleeve 203 is not less than the length of the gearbox docking section 101 extending out of the oil pipeline 102.

[0021] like Figure 2 - Figure 4As shown, the sealing mechanism 30 includes a fixing block 301. An annular mounting groove 1011 is provided on the outer wall of the gearbox mating section 101. The fixing block 301 is fixed to the inner wall of the annular mounting groove 1011 by a threaded connection. A cavity 3011 is provided on the side of the fixing block 301 near the sleeve 203. A pressure ring 302 is fitted on the inner wall of the cavity 3011. The outer diameter of the pressure ring 302 is adapted to the inner diameter of the cavity 3011 to disperse pressure, protect the elastic gasket 303 from shear damage, and improve sealing durability. The sealing mechanism 30 also includes an elastic gasket 303 and a sealing ring 304. One end of the elastic gasket 303 is fixedly connected to the side of the pressure ring 302 away from the fixing block 301, and the other end of the elastic gasket 303 is connected to the side of the sealing ring 304 near the pressure ring 302. The fixed connection has good axial elasticity and creep resistance, and can maintain preload under long-term compression. The side of the sealing ring 304 away from the elastic gasket 303 is in contact with the inner wall of the sleeve 203. The pressure ring 302 is elastically connected to the sealing ring 304 through the elastic gasket 303. Under compression, it expands radially to fill the tiny gap between the sleeve 203 and the joint, effectively preventing lubricating oil from seeping out along the outer wall. The elastic gasket 303 is made of oil-resistant engineering plastic, and the sealing ring 304 is made of fluororubber. The fixing block 301 and the inner wall of the cavity 3011 are integrally formed, which improves the structural strength, avoids the leakage risk that may occur in the split structure, and enhances reliability. The sealing ring 304 is slidably disposed on the inner wall of the cavity 3011 along the axial direction of the cavity 3011.

[0022] The working principle of this practical system is as follows: When the equipment needs maintenance, repair, or replacement of the lubrication pipeline, the operator can quickly disassemble the female connector assembly 20 from the male connector assembly 10. Before restarting, the two can be quickly reconnected. During the connection process, the operator holds the female connector assembly 20 and inserts it axially into the male connector assembly 10. Since one end of the gearbox mating section 101 is designed with a tapered structure that matches the gearbox oil return port, it can achieve self-guided alignment, which is convenient for blind insertion on site. As the insertion goes deeper, the sleeve 203 slides along the outer wall of the gearbox mating section 101, which plays a guiding and limiting role to ensure coaxial alignment. After the connecting pipe 202 contacts the oil pipeline 102, the female connector assembly 20 is rotated again, and the thread is locked by the cooperation of the external thread 1021 and the internal thread groove 2021.

[0023] During this process, as the sleeve 203 gradually advances to the side of the fixed block 301, its inner wall presses against the sealing ring 304 and transmits the pressure to the pressure ring 302 through the elastic gasket 303. Since the elastic gasket 303 has a certain compression resilience, it can generate a uniform radial deformation force under axial force, pushing the sealing ring 304 to fit tightly between the inner wall of the sleeve 203 and the connection area, forming a reliable dynamic seal. Even under vibration conditions, this elastic compensation mechanism can still maintain the sealing stability and prevent lubricating oil leakage.

[0024] When disconnected, the female connector assembly 20 is rotated in the opposite direction to release the threaded connection and pull outward. At this time, the sealing ring 304 automatically retracts under the action of the elastic gasket 303 restoring its deformation, and disengages from the sleeve 203. Since there is no pressure difference at the port of the oil pipeline 102 and it is in a high position with the gearbox usually above, residual oil is not easy to flow out. Combined with the self-sealing property of the fluororubber material itself, a leak-free disconnection can be effectively achieved, improving the cleanliness and safety of the site.

[0025] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A quick-sealing joint for a conical twin-screw gearbox lubrication recovery pipeline, characterized in that, The system includes a male connector assembly (10) and a female connector assembly (20). The male connector assembly (10) is used to connect to the fixed end of the lubrication recovery pipeline of the conical twin-screw gearbox, and the female connector assembly (20) is used to connect to the movable end of the lubrication system return oil pipeline. The male connector assembly (10) includes a gearbox docking section (101) and an oil delivery pipeline (102). One end of the gearbox docking section (101) is a conical structure adapted to the gearbox return oil port, and the inner wall of the other end of the gearbox docking section (101) is fixedly connected and communicates with one end of the oil delivery pipeline (102). The female connector assembly (20) includes a pipeline connection section (201), a connecting pipe (202), and a sleeve (203). One end of the pipe connection section (201) is used to connect to the return oil pipeline of the lubrication system. The other end of the pipe connection section (201) is fixedly connected to and communicates with one end of the connecting pipe (202). The sleeve (203) is coaxially fixedly sleeved on the outer wall of the connecting pipe (202). The inner wall of the sleeve (203) is in contact with the outer wall of the gearbox docking section (101). The end of the oil pipeline (102) away from the gearbox docking section (101) is detachably connected to the end of the connecting pipe (202) away from the pipe connection section (201) by a thread. A sealing mechanism (30) for enhancing sealing performance is provided at the mating point between the gearbox docking section (101) and the sleeve (203).

2. The quick-sealing joint for a conical twin-screw gearbox lubrication recovery pipeline according to claim 1, characterized in that: The inner wall of the connecting pipe (202) away from the pipe connection section (201) is provided with an internal thread groove (2021), and the outer wall of the oil pipeline (102) away from the gearbox docking section (101) is provided with an external thread (1021) that matches the internal thread groove (2021). The oil pipeline (102) is threadedly connected to the internal thread groove (2021) of the connecting pipe (202) through the external thread (1021).

3. The quick-sealing joint for a conical twin-screw gearbox lubrication recovery pipeline according to claim 1, characterized in that: The inner wall of the sleeve (203) is in transition fit with the outer wall of the gearbox docking section (101), and the length of the sleeve (203) is not less than the length of the gearbox docking section (101) extending out of the oil pipeline (102).

4. The quick-sealing joint for a conical twin-screw gearbox lubrication recovery pipeline according to claim 1, characterized in that: The sealing mechanism (30) includes a fixing block (301), and an annular mounting groove (1011) is provided on the outer wall of the gearbox docking section (101). The fixing block (301) is fixed to the inner wall of the annular mounting groove (1011) by a threaded connection.

5. A quick-sealing joint for a conical twin-screw gearbox lubrication recovery pipeline according to claim 4, characterized in that: The fixing block (301) has a cavity (3011) on the side near the sleeve (203). A pressure ring (302) is attached to the inner wall of the cavity (3011), and the outer diameter of the pressure ring (302) is adapted to the inner diameter of the cavity (3011).

6. A quick-sealing joint for a conical twin-screw gearbox lubrication recovery pipeline according to claim 5, characterized in that: The sealing mechanism (30) further includes an elastic gasket (303) and a sealing ring (304). One end of the elastic gasket (303) is fixedly connected to the side of the pressure ring (302) away from the fixing block (301), and the other end of the elastic gasket (303) is fixedly connected to the side of the sealing ring (304) near the pressure ring (302). The side of the sealing ring (304) away from the elastic gasket (303) is in contact with the inner wall of the sleeve (203).

7. A quick-sealing joint for a conical twin-screw gearbox lubrication recovery pipeline according to claim 6, characterized in that: The pressure ring (302) is elastically connected to the sealing ring (304) through an elastic gasket (303). The elastic gasket (303) is made of oil-resistant engineering plastic, and the sealing ring (304) is made of fluororubber.

8. A quick-sealing joint for a conical twin-screw gearbox lubrication recovery pipeline according to claim 7, characterized in that: The fixing block (301) and the inner wall of the cavity (3011) are integrally formed, and the sealing ring (304) is slidably disposed on the inner wall of the cavity (3011) along the axial direction of the cavity (3011).

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