Portable hydraulic pipeline expansion joint

Abstract

The invention relates to the field of hydraulic pipelines, and discloses a portable hydraulic pipeline expansion joint which comprises a movable joint, a threaded sleeve is connected to the bottom of the outer wall of the movable joint, steel ball grooves are formed in the sides, connected with the threaded sleeve, of the movable joint, and plugs are arranged at steel ball groove inlets of the threaded sleeve. A flat key is arranged on the outer wall of the threaded sleeve, the outer wall of the threaded sleeve is connected with an adjusting structure through the flat key, a guide key is arranged in the middle of the outer wall of the movable connector, the outer wall of the movable connector is connected with a fixed connector through the guide key, and sliding sealing rings are evenly arranged on the top of the outer wall of the movable connector. By adopting thread transmission, rotary motion transmitted manually is converted into axial motion, and the axial motion is transmitted to the joint through the steel ball rolling friction pair, so that the joint is axially stretched out and drawn back, axial thrust borne by the joint in the axial stretching out and drawing back process is evenly distributed, and the problems of motion clamping stagnation and end face inclination caused by uneven stress are solved.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic pipelines, in particular to a convenient hydraulic pipeline expansion joint. Background Art

[0002] Hydraulic pipelines are pipes used to transmit hydraulic oil in hydraulic systems. They connect hydraulic pumps, hydraulic valves, hydraulic cylinders and other hydraulic components together to form a complete hydraulic circuit to achieve energy transmission and conversion, thereby driving the working parts of various mechanical equipment to perform corresponding actions. Hydraulic pipelines are usually made of metal pipes or rubber hoses, with different sizes and specifications to meet the flow and pressure requirements of different hydraulic systems.

[0003] In fluid and hydraulic pipelines, for some components that rely on flange connections, they are often fastened with studs and nuts, and sealed with end face sealing rings and gaskets. Currently, when there are no telescopic joints in the pipeline, when installing and removing the connecting parts at this part, it is necessary to use manual or mechanical methods to force the pipeline to bend and deform, and then dock, install and tighten; this installation method is labor-intensive and easily causes damage to the pipeline, installation joints and end face sealing surfaces, thereby causing end face sealing failure and pipeline fluid and hydraulic leakage; and the telescopic joints used in traditional hydraulic pipelines have complex structures and large friction in telescopic movement, which leads to the occurrence of telescopic movement jams. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a convenient hydraulic pipeline expansion joint to solve the problem that the expansion joints used in traditional hydraulic pipelines have complex structures, large expansion and contraction friction, and cause the expansion and contraction movement to be stuck.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a portable hydraulic pipeline expansion joint, including a movable joint, a threaded sleeve is connected to the bottom of the outer wall of the movable joint, a steel ball groove is provided on the side where the movable joint is connected to the threaded sleeve, a plurality of steel balls are provided in the steel ball grooves of the movable joint and the threaded sleeve, a plug is provided at the entrance of the steel ball groove of the threaded sleeve, a flat key is provided on the outer wall of the threaded sleeve, an adjustment structure is connected to the outer wall of the threaded sleeve through the flat key, a guide key is provided in the middle of the outer wall of the movable joint, the outer wall of the movable joint is connected to a fixed joint through the guide key, and sliding sealing rings are evenly provided on the top of the outer wall of the movable joint.

[0006] Preferably, the top of the fixed joint is connected to the hydraulic pipeline via bolts, a second gasket and a nut, and an end face sealing ring is provided on the side of the fixed joint connected to the hydraulic pipeline.

[0007] Preferably, the outer wall of the fixing joint is provided with an external thread, and the inner wall of the threaded sleeve is provided with an internal thread, which is threadedly connected with the external thread of the outer wall of the fixing joint.

[0008] Preferably, the adjustment structure adopts a gear transmission structure, and the gear transmission structure includes a large gear, the inner wall of the large gear is connected to the outer wall of the threaded sleeve through a flat key, and the outer wall of the large gear is meshingly connected with a small gear.

[0009] Preferably, one side of the pinion is connected to a bracket via a first washer and a first screw, and the bracket is mounted on one side of the movable joint via a second screw.

[0010] Preferably, the outer wall of the threaded sleeve is threadedly connected with a compression screw sleeve, the compression screw sleeve is located above the large gear, and a sealing ring is provided at the bottom of the movable joint.

[0011] Preferably, the adjustment structure adopts a handle, and one end of the handle is fixedly connected to one side of the threaded sleeve.

[0012] Working principle: When using this joint, connect the top of the fixed joint to the hydraulic pipeline with bolts, a second gasket and a nut, and set an end face sealing ring on one side of the connection. Use a ratchet wrench to quickly twist the end of the small gear in one direction to make the small gear rotate in one direction on the bracket, thereby driving the large gear to rotate in one direction, so that the large gear drives the threaded sleeve to rotate on the fixed joint through the flat key, and converts it into axial motion through the threaded transmission pair. Then the threaded sleeve presses the steel ball through its steel ball groove, so that the steel ball rolls in the steel ball groove, and presses the movable joint through the steel ball groove to make axial expansion and contraction motion. At the same time, the axial expansion and contraction pressure of the threaded sleeve is transmitted to the movable joint, so that the movable joint produces axial expansion and contraction motion on the fixed joint, and the guide key is used to prevent the movable joint from rotating with the threaded sleeve, so that the movable joint moves axially with the threaded sleeve to produce expansion and contraction. At the same time, the two sliding sealing rings move with the movable joint to prevent the fluid from leaking from the fitting gap between the fixed joint and the movable joint.

[0013] The present invention provides a convenient hydraulic pipeline expansion joint, which has the following beneficial effects:

[0014] 1. The present invention converts the manually transmitted rotational motion into axial motion by adopting threaded transmission, and transmits it to the joint through the steel ball rolling friction pair, so that the joint can achieve axial expansion and contraction, so that the axial thrust received by the joint during the axial expansion and contraction process is evenly distributed, and the movement is smooth, thereby avoiding the problems of movement jamming and end face tilting due to uneven force, and thus avoiding the problems of hydraulic and fluid leakage caused by end face tilting and sealing failure, and also reducing the operating friction.

[0015] 2. The overall structure of the present invention is relatively simple and easy to operate. It can be widely used in hydraulic and fluid pipelines in the fields of engineering machinery, oil and gas transportation, aerospace, etc. It can effectively simplify the manual operation steps of joint docking, reduce the labor intensity of operation, and avoid joint leakage, thereby improving the working reliability of the pipeline system.

[0016] 3. The present invention connects a threaded sleeve at the bottom of the outer wall of the movable joint, arranges a plurality of steel balls in the steel ball grooves of the two, and arranges a plug at the entrance of the steel ball groove of the threaded sleeve. At the same time, a flat key connection adjustment structure is arranged on the outer wall of the threaded sleeve. The middle part of the outer wall of the movable joint is connected to the fixed joint through a guide key, and a sliding sealing ring is arranged on the top of the outer wall, so that the movable joint can be extended and retracted in the fixed joint through the adjustment structure, the steel balls reduce friction and can transmit pressure, the guide key prevents the movable joint from rotating, and the sliding sealing ring prevents leakage, thereby improving the telescopic flexibility and sealing performance of the hydraulic pipeline expansion joint.

[0017] 4. The present invention connects the hydraulic pipeline via a fixed joint, an external thread is arranged on the outer wall of the fixed joint, an internal thread is arranged on the inner wall of the threaded sleeve and is threadedly connected to the fixed joint, so that the threaded sleeve can rotate on the fixed joint and realize axial movement through thread transmission; by arranging a sealing ring at the bottom of the movable joint, when the adjustment structure drives the threaded sleeve to adjust the position of the relevant structure, the sealing of the bottom of the movable joint can be enhanced, thereby improving the adjustability and sealing of the joint structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the scheme of the present invention when the operating space is small;

[0019] Figure 2 It is a schematic diagram of the scheme of the present invention when the operating space is large.

[0020] Among them, 1. end face sealing ring; 2. sliding sealing ring; 3. fixed joint; 4. flat key; 5. small gear; 6. bracket; 7. first gasket; 8. first screw; 9. second screw; 10. sealing ring; 11. movable joint; 12. steel ball; 13. plug; 14. large gear; 15. guide key; 16. tightening screw sleeve; 17. threaded sleeve; 18. bolt; 19. second gasket; 20. nut; 21. handle; 22. hydraulic pipeline. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example:

[0023] Please refer to the attached Figure 1 , Attachment Figure 2 The embodiment of the present invention provides a convenient hydraulic pipeline expansion joint, including a movable joint 11, a threaded sleeve 17 is connected to the bottom of the outer wall of the movable joint 11, a steel ball groove is provided on one side where the movable joint 11 and the threaded sleeve 17 are connected, a plurality of steel balls 12 are provided in the steel ball grooves of the movable joint 11 and the threaded sleeve 17, a plug 13 is provided at the entrance of the steel ball groove of the threaded sleeve 17, a flat key 4 is provided on the outer wall of the threaded sleeve 17, an adjustment structure is connected to the outer wall of the threaded sleeve 17 through the flat key 4, a guide key 15 is provided in the middle of the outer wall of the movable joint 11, and the outer wall of the movable joint 11 is connected to the outer wall of the threaded sleeve 17 through the guide key 15 is connected with a fixed joint 3, and a sliding sealing ring 2 is evenly arranged on the top of the outer wall of the movable joint 11; the top of the fixed joint 3 is connected with a hydraulic pipeline 22 through a bolt 18, a second gasket 19, and a nut 20, and an end face sealing ring 1 is arranged on the side where the fixed joint 3 is connected to the hydraulic pipeline 22; the outer wall of the fixed joint 3 is provided with an external thread, and the inner wall of the threaded sleeve 17 is provided with an internal thread, which is threadedly connected with the external thread of the outer wall of the fixed joint 3; the outer wall of the threaded sleeve 17 is threadedly connected with a clamping screw sleeve 16, and the clamping screw sleeve 16 is located above the large gear 14, and a sealing ring 10 is arranged at the bottom of the movable joint 11.

[0024] Specifically, by connecting a threaded sleeve 17 at the bottom of the outer wall of the movable joint 11, arranging a plurality of steel balls 12 in the steel ball grooves of the two, and arranging a plug 13 at the entrance of the steel ball groove of the threaded sleeve 17, and arranging a flat key 4 on the outer wall of the threaded sleeve 17 to connect the adjustment structure, the middle part of the outer wall of the movable joint 11 is connected to the fixed joint 3 through a guide key 15, and a sliding sealing ring 2 is arranged on the top of the outer wall, so that the movable joint 11 can be extended and retracted in the fixed joint 3 through the adjustment structure, the steel ball 12 reduces friction and can transmit pressure, the guide key 15 prevents the movable joint 11 from rotating with the threaded sleeve 17 during the extension and retraction process, and the sliding sealing ring 2 prevents leakage, thereby improving the telescopic flexibility and sealing performance of the hydraulic pipeline expansion joint;

[0025] The hydraulic pipeline 22 is connected with the fixing joint 3 by using the bolt 18, the second washer 19 and the nut 20 at the top, and the end face sealing ring 1 is arranged on one side of the connection, so that the hydraulic pipeline 22 is reliably connected with the fixing joint 3 and the sealing is good; the outer wall of the fixing joint 3 is provided with an external thread, the inner wall of the threaded sleeve 17 is provided with an internal thread and is threadedly connected with the fixing joint 3, so that the threaded sleeve 17 can rotate on the fixing joint 3 and realize axial movement through thread transmission;

[0026] By threading the compression screw sleeve 16 on the outer wall of the threaded sleeve 17 and locating it above the large gear 14, the large gear 14 is prevented from falling off the threaded sleeve 17. By arranging a sealing ring 10 at the bottom of the movable joint 11, when the adjustment structure drives the threaded sleeve 17 to adjust the position of the relevant structure, the sealing of the bottom of the movable joint 11 can be enhanced, thereby improving the adjustability and sealing of the joint structure; thereby solving the problem of complex structure, large friction force of telescopic movement and stagnation of telescopic movement of telescopic joints used in traditional hydraulic pipelines.

[0027] Please refer to the attached Figure 1 , Attachment Figure 2 In one embodiment, the adjustment structure adopts a gear transmission structure, which includes a large gear 14, the inner wall of the large gear 14 is connected to the outer wall of the threaded sleeve 17 through a flat key 4, and the outer wall of the large gear 14 is meshed with a small gear 5; one side of the small gear 5 is connected to a bracket 6 through a first washer 7 and a first screw 8, and the bracket 6 is installed on one side of the movable joint 11 through a second screw 9.

[0028] Specifically, the inner wall of the large gear 14 is connected to the outer wall of the threaded sleeve 17 by a flat key 4, and the outer wall of the large gear 14 is meshed with the pinion 5, so that the pinion 5 can be driven to rotate by a ratchet wrench, and the large gear 14 can be driven to rotate, and then the threaded sleeve 17 can be driven to rotate to achieve telescopic movement; the bracket 6 is connected to one side of the pinion 5 by a first washer 7 and a first screw 8, and the bracket 6 is installed on one side of the movable joint 11 by a second screw 9, so as to achieve a stable installation of the pinion 5 and ensure its rotation flexibility and position accuracy.

[0029] In another embodiment, the adjustment structure adopts a handle 21 , and one end of the handle 21 is fixedly connected to one side of the threaded sleeve 17 .

[0030] Specifically, by fixing the handle 21 on one side of the threaded sleeve 17, the handle 21 can be directly used to drive the threaded sleeve 17 to rotate to achieve the extension and retraction of the movable joint 11 when the operating space is large, thereby improving the operational convenience of the joint extension and retraction under specific space conditions.

[0031] The following is further introduced in conjunction with specific embodiments:

[0032] Embodiment 1:

[0033] The fixed joint 3 is fixed to the hydraulic pipeline 22 by bolts 18, second washers 19 and nuts 20, and the end face is sealed by the end face sealing ring 1. The threaded sleeve 17 is sleeved on the movable joint 11, and then a number of steel balls 12 are installed into the steel ball grooves on the threaded sleeve 17 and the movable joint 11 through the steel ball entrance, and the two are installed and connected together, and then the plug 13 is installed. The flat key 4 is installed in the keyway of the threaded sleeve 17, and then the large gear 14 is installed on the threaded sleeve 17 and compressed with the compression screw sleeve 16. Then the two sliding sealing rings 2 are installed and bumped into the sealing groove of the movable joint 11, and the guide key 15 is installed in the installation hole of the fixed joint 3. Then align the keyway on the movable joint 11 with the guide key 15 on the fixed joint 3, first insert the outer circle of the movable joint 11 into the hole of the fixed joint 3, then insert the guide key 15 into the keyway of the movable joint 11, and then screw the internal thread of the threaded sleeve 17 onto the external thread of the fixed joint 3, so as to install the assembly consisting of the movable joint 11, the threaded sleeve 17, the large gear 14 and other parts on the fixed joint 3. Install and tighten the bracket 6 to the movable joint 11 through the second screw 9, and then install the pinion 5 to the bracket 6, and ensure that the pinion 5 and the large gear 14 are meshed with each other. Then install the first washer 7 and the first screw 8 on the pinion 5, and tighten the first screw 8. Then install the sealing ring 10 into the sealing groove of the movable joint 11.

[0034] During the expansion and contraction process of the joint, a ratchet wrench is used to quickly and unidirectionally twist the end of the pinion 5 so that the pinion 5 rotates unidirectionally on the bracket 6. In order to ensure that the pinion 5 rotates flexibly on the bracket 6, the length of the mounting journal of the pinion 5 should be 0.5 to 1 mm greater than the height of the bracket 6, so that after the first washer 7 is tightened by the first screw 8, the pinion 5 forms an axial movable clearance of 0.5 to 1 mm. When the pinion 5 rotates unidirectionally, the large gear 14 is driven to rotate unidirectionally. The large gear 14 drives the threaded sleeve 17 to rotate on the fixed joint 3 through the flat key 4, and converts it into axial motion through the threaded transmission pair. Then the threaded sleeve 17 presses the steel ball 12 through its steel ball groove, so that the steel ball 12 rolls in the steel ball groove and pushes the movable joint 11 through the steel ball groove to perform axial expansion and contraction motion. The function of the steel ball 12 is to reduce the friction force generated by the relative movement between the threaded sleeve 17 and the movable joint 11 in the axial rotation direction through rolling friction, and at the same time transmit the axial expansion and contraction pressure of the threaded sleeve 17 to the movable joint 11, so that the movable joint 11 produces axial expansion and contraction movement on the fixed joint 3. The guide key 15 is inserted into the keyway of the movable joint 11 to prevent the movable joint 11 from rotating with the threaded sleeve 17, so that the movable joint 11 can only move axially with the threaded sleeve 17 to produce expansion and contraction. During the joint expansion and contraction process, the two sliding sealing rings 2 move with the movable joint 11 to prevent the fluid from leaking from the matching gap between the fixed joint 3 and the movable joint 11.

[0035] If the operating space is large, the transmission mechanisms such as the pinion 5, the large gear 14 and the bracket 6 can be removed, and the handle 21 can be directly installed to directly drive the threaded sleeve 17 to rotate, so as to realize the extension and retraction of the movable joint 11.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A portable hydraulic pipeline expansion joint, comprising a movable joint (11), characterized in that: The bottom of the outer wall of the movable joint (11) is connected with a threaded sleeve (17); a steel ball groove is provided on one side where the movable joint (11) and the threaded sleeve (17) are connected; a plurality of steel balls (12) are provided in the steel ball grooves of the movable joint (11) and the threaded sleeve (17); a plug (13) is provided at the entrance of the steel ball groove of the threaded sleeve (17); a flat key (4) is provided on the outer wall of the threaded sleeve (17); the outer wall of the threaded sleeve (17) is connected with an adjustment structure via the flat key (4); a guide key (15) is provided in the middle of the outer wall of the movable joint (11); the outer wall of the movable joint (11) is connected with a fixed joint (3) via the guide key (15); and sliding sealing rings (2) are evenly provided on the top of the outer wall of the movable joint (11).

2. A portable hydraulic pipeline expansion joint according to claim 1, characterized in that: The top of the fixed joint (3) is connected to a hydraulic pipeline (22) via a bolt (18), a second gasket (19) and a nut (20), and an end face sealing ring (1) is provided on one side of the fixed joint (3) connected to the hydraulic pipeline (22).

3. The portable hydraulic pipeline expansion joint according to claim 1, characterized in that: The outer wall of the fixing joint (3) is provided with an external thread, and the inner wall of the threaded sleeve (17) is provided with an internal thread, which is threadedly connected to the external thread of the outer wall of the fixing joint (3).

4. The portable hydraulic pipeline expansion joint according to claim 1, characterized in that: The adjustment structure adopts a gear transmission structure, which comprises a large gear (14), the inner wall of the large gear (14) is connected to the outer wall of the threaded sleeve (17) through a flat key (4), and the outer wall of the large gear (14) is meshingly connected with a small gear (5).

5. A portable hydraulic pipeline expansion joint according to claim 4, characterized in that: One side of the pinion (5) is connected to a bracket (6) via a first washer (7) and a first screw (8), and the bracket (6) is mounted on one side of the movable joint (11) via a second screw (9).

6. The portable hydraulic pipeline expansion joint according to claim 1, characterized in that: The outer wall of the threaded sleeve (17) is threadedly connected with a compression screw sleeve (16), and the compression screw sleeve (16) is located above the large gear (14). A sealing ring (10) is arranged at the bottom of the movable joint (11).

7. The portable hydraulic pipeline expansion joint according to claim 1, characterized in that: The adjustment structure adopts a handle (21), one end of which is fixedly connected to one side of the threaded sleeve (17).

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