Anti-rollback threaded connector

Abstract

The invention relates to an anti-rollback threaded connector which comprises a spline shell and a connecting nut, a rotating support is arranged on the periphery of the spline shell, a locking piece is rotationally supported on the rotating support, and an elastic reset piece used for providing power for the locking piece to enable the locking piece to rotate anticlockwise is further arranged between the locking piece and the spline shell. A locking cap is arranged on the periphery of the spline shell in a sliding mode, a long groove extending in the axial direction is further formed in one side of the tail of the locking cap, when the locking cap slides in the axial direction of the spline shell, the locking piece is located in the long groove, and when the locking cap slides to the position where the locking cap is matched with the connecting nut through a concave-convex structure to achieve circumferential rotation stopping, the locking piece is located in the long groove. The locking sheet is pressed on a stop wall at the front end of the long groove under the action of the elastic reset piece, so that the locking sheet cannot axially slide backwards; when the connecting nut needs to be rotated for unlocking, the locking piece can compress the elastic reset piece to rotate clockwise under the action of external force, so that the locking nut can move backwards to be separated from the connecting nut. The anti-backspacing device is convenient to assemble and operate, and can realize reliable backspacing prevention.

Description

Technical Field

[0001] The present invention belongs to the technical field of connectors, and particularly relates to an anti-back-off threaded connector. Background Art

[0002] For existing plugs and sockets using threaded connections, generally, the anti-loosening function after the plug and the socket are installed in place is achieved through the anti-loosening structure designed inside the plug.

[0003] Existing anti-loosening structures such as Figure 1 shown, the plug contains a steel ball anti-loosening structure. The spring is installed in the spline housing steel ball groove, then the steel ball is installed, and finally the spline housing is installed in the connecting nut. The inner circumference of the connecting nut is evenly distributed with ratchet teeth grooves. When the plug and the socket are threadedly connected, the connecting nut is rotated clockwise, and the steel ball falls into and out of the ratchet teeth groove under the action of the spring force and the rotation of the connecting nut... After the plug and the socket are connected in place, the steel ball falls into the ratchet teeth groove.

[0004] The above anti-loosening structure is relatively complex. It is necessary to machine ratchet teeth grooves on the inner circumference of the connecting nut and steel ball grooves on the outer circumference of the spline housing. And when the connecting nut is locked, it is necessary to overcome the spring force and squeeze the steel ball inward, and the locking is relatively laborious. Processing, assembly and use are all inconvenient. Summary of the Invention

[0005] The purpose of the present invention is to provide an anti-back-off threaded connector with a new structure, which realizes axial locking limit and unlocking of the locking cap through the action of a locking piece and a torsion spring arranged on the outer circumference of the spline housing, and further realizes circumferential rotation stop limit of the connecting nut through the locking cap to prevent the connecting nut from retreating.

[0006] The purpose of the present invention and the solution to its technical problems are achieved by adopting the following technical solutions. An anti-back-off threaded connector according to the present invention includes a spline housing 3 and a connecting nut 1. A rotating support 302 is provided on the outer circumference of the spline housing 3. The locking piece 6 is rotatably supported on the rotating support 302. An elastic resetting member 5 is further provided between the locking piece 6 and the spline housing 3 for providing the locking piece 6 with the power to rotate in the counterclockwise direction. A locking cap 9 is also slidably provided on the outer circumference of the spline housing 3. A long groove 902 extending axially is provided on one side of the tail of the locking cap 9. When the locking cap 9 slides axially along the spline housing 3, the rotating support 302 and the locking piece 6 are located in the long groove 902. And when the locking cap 9 slides to a position where it is circumferentially rotationally stopped in cooperation with the connecting nut 1 through the concave-convex structure, the locking piece 6 is pressed against the stop wall 903 at the front end of the long groove 902 under the action of the elastic resetting member 5 to prevent it from sliding backward. When the connecting nut 1 needs to be rotated and unlocked, the locking piece 6 can rotate clockwise by compressing the elastic resetting member 5 under the action of an external force, so that the locking cap 9 can move backward to separate from the connecting nut 1.

[0007] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0008] In the aforementioned anti-backward threaded connector, the stop wall 903 is an inclined surface. When the locking cap 9 and the connecting nut 1 are circumferentially stopped, the locking sheet 6 is pressed on the stop wall 903 through the locking surface 602 thereon.

[0009] The aforementioned anti-backoff threaded connector, the locking plate 6 is provided with an unlocking surface 603 and a limiting surface 604 in sequence above the locking surface 602. When the connecting nut 1 is unlocked, the locking plate 6 rotates clockwise so that the locking surface 602 and the unlocking surface 603 thereon are both rotated into the locking cap 9. The locking cap 9 can move axially backward over the locking surface 602 and the unlocking surface 603. When the stopping wall 903 is stopped by the limiting surface 604, the locking cap 9 is completely separated from the connecting nut 1.

[0010] In the aforementioned anti-retraction threaded connector, when the stopping wall 903 is stopped by the limiting surface 604 , the unlocking surface 603 is in a horizontal state, and is adapted and locked with the locking protrusion 904 on the inner wall of the locking cap 9 through the locking groove 605 thereon.

[0011] In the aforementioned anti-backward threaded connector, the limiting surface 604 is an inclined surface that can be adapted to fit with the stopping wall 903 .

[0012] In the aforementioned anti-backoff threaded connector, the locking cap 9 is a stepped hole structure with a larger front and a smaller rear, the long groove 902 passes through the wall of the small hole end 905 at the rear end and extends to the inner wall of the large hole end 906; the locking protrusion 904 is located on the inner wall of the large hole end 906 of the locking cap 9.

[0013] In the aforementioned anti-backward threaded connector, the outer periphery of the spline housing 3 is further provided with a limiting member 10 for limiting the axial backward displacement of the locking cap 9.

[0014] In the aforementioned anti-backward threaded connector, the elastic reset member 5 is a torsion spring.

[0015] In the aforementioned anti-backward threaded connector, the rear end of the connecting nut 1 is provided with a second ratchet 101 , and the front end of the locking cap 9 is provided with a matching first ratchet 901 .

[0016] In the aforementioned anti-backward threaded connector, the locking piece 6 and the torsion spring are both connected to the rotating support 302 via the pin 4 .

[0017] Compared with the prior art, the present invention has obvious advantages and beneficial effects. By means of the above technical solution, the present invention can achieve considerable technical advancement and practicality, and has wide industrial utilization value, and has at least the following advantages:

[0018] The structure of the present invention is simple and can achieve cyclic unlocking and locking. When unlocking, the plug and the socket can be normally connected and separated, and when locking, the threaded connection part between the plug and the socket does not retreat.

[0019] The present invention realizes the axial limit of the locking cap only by adding a rotating support on the outer periphery of the spline housing, and arranging a locking piece and a torsion spring for driving the locking piece to rotate on the rotating support, so that the locking cap maintains locking or unlocking with the connecting nut. The structure is simple and easy to assemble and operate.

[0020] In addition, when the present invention is locked, the locking piece can push the locking cap to move towards the locking position, and when unlocking, only the end part of the locking piece needs to be pressed to easily move the locking cap away from the connecting nut, and the operation is convenient and labor-saving. Description of the Drawings

[0021] Figure 1 It is a schematic diagram of anti-retreat of an existing connector;

[0022] Figure 2 It is an exploded view of the anti-retreat threaded connector of the present invention;

[0023] Figure 3 It is a schematic diagram of the structure of the spline housing of the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of the locking piece of the present invention;

[0025] Figure 5 It is a schematic diagram of the structure of the locking cap of the present invention;

[0026] Figure 6 It is a schematic diagram of the locking state of the anti-retreat threaded connector of the present invention;

[0027] Figure 7 It is a schematic diagram of the unlocking state of the anti-retreat threaded connector of the present invention.

[0028]

Description of the Main Component Symbols

[0029] 1: Connecting nut

[0030] 101: Second ratchet

[0031] 2: First gasket

[0032] 3: Spline housing

[0033] 301: Ring platform

[0034] 302: Rotating support

[0035] 3021: Tab

[0036] 303: Ring groove

[0037] 304: Annular groove

[0038] 4: Pin

[0039] 5: Elastic reset member

[0040] 6: Locking piece

[0041] 601: Groove

[0042] 602: Locking surface

[0043] 603: Unlocking surface

[0044] 604: Limiting surface

[0045] 605: Locking groove

[0046] 606: Unlocking pressing surface

[0047] 7: Second gasket

[0048] 8: Snap ring

[0049] 9: Locking cap

[0050] 901: First ratchet tooth

[0051] 902: Long slot

[0052] 903: Stop wall

[0053] 904: Locking protrusion

[0054] 905: Small hole end

[0055] 906: Large hole end

[0056] 10: Stop member Detailed implementation manners

[0057] To further elaborate on the technical means and effects adopted by the present invention to achieve the intended invention purpose, the following, in combination with the accompanying drawings and preferred embodiments, details the specific implementation manners, structures, features and effects of the anti-back-off threaded connector according to the present invention as follows.

[0058] Please refer to Figure 2-7 , which is a schematic diagram of the structures of various parts of the anti-back-off threaded connector of the present invention. The connector includes a spline housing 3 and a connection nut 1 rotatably arranged on the outer periphery of the front end of the spline housing 3 and axially tensilely connected to the spline housing 3.

[0059] The outer periphery of the spline housing 3 is provided with an annular platform 301. The inner periphery of the tail of the connecting nut 1 is provided with an annular groove, and a snap ring 8 is installed in the annular groove. The connecting nut 1 is in anti-pull connection with the rear end face of the annular platform 301 through the snap ring 8. In this embodiment, a second gasket 7 is further provided between the snap ring 8 and the annular platform 301. The outer periphery of the second gasket 7 is in the shape of a stepped shaft with a larger front and a smaller rear. The outer peripheral surface of the small-diameter part at the rear end is blocked on the inner periphery of the snap ring 8, and the gap between the snap ring 8 and the second gasket 7 is not enough to allow the snap ring 8 to escape from the annular groove in the connecting nut 1, realizing the anti-detachment of the snap ring 8. A first gasket 2 is further provided between the front end face of the annular platform 301 and the connecting nut 1.

[0060] The outer periphery of the spline housing 3 is further provided with a locking cap 9, which can slide axially along the spline housing 3, and the outer periphery of the spline housing 3 is further provided with a stopper 10 for restricting the axial backward sliding stroke of the locking cap 9. In this embodiment, the stopper 10 is a snap ring, which is detachably and fixedly assembled in the annular groove 303 on the outer periphery of the spline housing 3. The axial forward sliding stroke of the locking cap 9 is restricted by the tail of the connecting nut 1, and the front end of the locking cap 9 can also be in circumferential anti-rotation cooperation with the tail of the connecting nut 1. In this embodiment, a first ratchet tooth 901 is provided on the front end face of the locking cap 9, and a second ratchet tooth 101 is provided on the end face of the tail of the connecting nut 1. When the locking cap 9 moves axially forward to the position where it is axially blocked and limited with the connecting nut 1, the two realize circumferential anti-rotation cooperation through the engagement of the first ratchet tooth 901 and the second ratchet tooth 101. In other embodiments of the present invention, the first ratchet teeth 901 are distributed on the outer peripheral surface of the front end of the locking cap 9, and the second ratchet teeth 101 are distributed on the inner peripheral surface of the tail of the connecting nut 1. At this time, the locking cap 9 can be embedded in the connecting nut 1 and axially blocked by the connecting nut 1 when the first ratchet teeth 901 and the second ratchet teeth 101 are engaged. The first ratchet teeth 901 can also be distributed on the inner peripheral surface of the front end of the locking cap 9, and the second ratchet teeth 101 are distributed on the outer peripheral surface of the tail of the connecting nut 1. At this time, the front end of the locking cap 9 can be sleeved on the outer periphery of the connecting nut 1 and axially blocked by the connecting nut 1 when the first ratchet teeth 901 and the second ratchet teeth 101 are engaged.

[0061] In other embodiments of the present invention, the connecting nut 1 and the locking cap 9 can also realize circumferential anti-rotation through the cooperation of at least one convex key and a key groove. For example, at least one axially extending convex key or key groove is provided along the circumference at the tail of the connecting nut 1, and at least one key groove or convex key adapted to the above convex key or key groove is provided axially at the front end of the locking cap 9. Through the concave-convex cooperation of the convex key and the key groove, the circumferential anti-rotation between the connecting nut 1 and the locking cap 9 is realized.

[0062] On one side of the outer circumference of the spline housing 3, a rotating support 302 is further provided. The locking piece 6 is rotatably connected to the rotating support 302 through a pin 4. The rotating support 302 is composed of two convex pieces 3021 that extend along the axial direction of the spline housing 3 and are circumferentially spaced apart along the outer circumference of the spline housing 3. Through holes adapted to the pin 4 are provided on the convex pieces 3021. An elastic reset member 5 is further fixed on the rotating support 302. One end of the elastic reset member 5 presses on the spline housing 3, and the other end presses on the locking piece 6, and can provide power for the locking piece 6 to rotate counterclockwise. In this embodiment, the elastic reset member 5 is a torsion spring, and the torsion spring 5 is fixed on the rotating support 302 through a pin 4. A groove 601 for one end of the torsion spring to enter is provided at the bottom of the locking piece 6. The groove 601 extends along the length direction of the locking piece 6, and the bottom and the front end (the end of the locking piece 6 provided with a pin hole for the pin 4 to pass through) of the groove 601 are open, so that the end of the torsion spring can smoothly enter the groove.

[0063] On one side of the tail of the locking cap 9, a long groove 902 extending axially is further provided. The long groove 902 is a through groove penetrating the thickness direction of the locking cap 9. When the locking cap 9 slides axially, it is axially slidably guided and circumferentially rotationally stopped in cooperation with the rotating support 302 on the outer circumference of the spline housing 3 and the locking piece 6 through the long groove 902. And when the locking cap 9 slides axially forward to the position where it is in concave-convex fit and circumferentially rotationally stopped with the connecting nut 1, the locking piece 6 presses on the stop wall 903 at the front end of the long groove 902 on the locking cap 9 under the action of the torsion spring, and provides an axially forward force for the locking cap 9 to prevent the locking cap 9 from moving axially backward and releasing the circumferential rotational stop cooperation with the connecting nut 1. In this embodiment, the stop wall 903 is an inclined surface with a lower inner side and a higher outer side. The locking surface 602 of the upper end of the locking piece 6 that is stop-limited with the stop wall 903 is also an inclined surface that can be adaptively fitted with the stop wall 903.

[0064] The upper end of the locking piece 6 is successively provided with a locking surface 602, an unlocking surface 603, and a limiting surface 604 that rise in sequence from front to back. When the connecting nut 1 needs to be unlocked, press the locking piece 6 downward and pull the locking cap 9 axially backward, or directly pull the locking cap 9 forcefully to make the locking piece 6 compress the torsion spring and rotate clockwise downward to make way. When the locking cap 9 moves axially backward, the stop wall 903 on it successively crosses the locking surface 602 and the unlocking surface 603 on the locking piece 6 until it is axially stopped by the limiting surface 604. At this time, the locking cap 9 is unlocked in place and disengages from the connecting nut 1, and the connecting nut 1 can rotate freely.

[0065] In this embodiment, when the locking cap 9 moves to the position where the stop wall 903 is axially stopped by the limiting surface 604, the locking surface 603 is in a horizontal state. At the same time, the end surface of the tail of the locking cap 9 is also stop-limited by the stop member 10 on the spline housing 3 to prevent it from continuing to squeeze the locking piece 6 and move backward.

[0066] In this embodiment, the limiting surface 604 is an inclined surface that can be attached to the stop wall 903. The locking piece 6 is also provided at the end with an unlocking pressing surface 606 connected to the limiting surface 604. When the locking cap 9 and the connecting nut 1 are locked, the unlocking pressing surface 606 is in a horizontal state.

[0067] In this embodiment, a locking protrusion 904 is further provided on the inner wall of the locking cap 9, and a locking groove 605 adapted to the locking protrusion 904 is provided on the unlocking surface 603. When the locking cap 9 moves to the position where the stopping wall 903 is stopped and limited by the limiting surface 604, the locking protrusion 904 is adapted to be locked with the locking groove 605, so that the locking cap 9 is kept at a position separated from the connecting nut 1. In other embodiments of the present invention, the setting of the locking protrusion 904 and the locking groove 605 can also be cancelled, and the locking cap 9 is kept at a position separated from the connecting nut 1 by an external force.

[0068] In this embodiment, the locking protrusion 904 is a convex bulge, and the locking groove 605 is a rectangular groove. However, in other embodiments of the present invention, the locking protrusion 904 can also be in other shapes. Preferably, the front end surface of the locking protrusion 904 is a guide surface that can guide it to escape from the locking groove 605, such as an inclined surface or a curved surface.

[0069] In the embodiment of the present invention, the locking cap 9 has an inner hole that is larger at the front and smaller at the rear, wherein the long groove 902 extends from the wall of the small hole end 905 at the rear end to the wall of the large hole end 906 at the front end, and the stop wall 903 is located on the wall of the large hole end 906 at the front end. The locking protrusion 904 is located on the inner wall of the large hole end 906 at the front end. The locking cap 9 slides with the spline housing 3 with a small gap through the inner wall of the small hole end 905 at the rear end. In other embodiments of the present invention, the locking cap 9 has a cylindrical structure with a constant inner diameter. At this time, a groove extending axially is also provided in the locking cap 9, which is located in front of the long groove 902 and extends to the inner side of the stopping wall 903. The locking protrusion 904 is located in the long groove 902. When the locking cap 9 needs to move axially backward, the locking plate 6 is rotated clockwise so that the locking surface 602 and the unlocking surface 603 of the locking plate 6 are rotated into the groove to avoid the stopping wall 903, so that the stopping wall 903 can move axially backward over the locking surface 602 and the unlocking surface 603.

[0070] After the connector of the present invention is inserted into place with the mating connector and locked by the connection nut 1, the locking cap 9 is axially pushed forward to unlock the locking cap 9 from the locking piece 6 or the locking piece 6 is first pressed to unlock it from the locking cap 9, and then the locking cap 9 is continuously pushed forward until its front end is adapted and locked with the connection nut 1. At the same time, under the action of the torsion spring, the locking piece 6 is pushed to rotate counterclockwise, and its locking surface 602 is pressed against the stop wall at the front end of the long groove on the locking cap 9, so that the locking cap 9 is held in the position locked with the connection nut 1. When it is necessary to unlock the connection nut, the locking piece 6 can be pressed, so that the locking surface 602 and the unlocking surface 603 that stop and limit the stop wall 903 on the locking piece 6 both rotate into the large hole of the locking cap 9, and the limiting surface 604 moves away from the stop wall 903, so that the stop wall 903 can move to the position where it stops against the limiting surface 604 of the locking piece. At this time, the axial movement distance of the stop wall 903 is not less than the minimum axial displacement required for the locking cap 9 to disengage from the connection nut 1, and the connection nut 1 can rotate freely.

[0071] In the embodiment of the present invention, an annular groove 304 is further provided between the annular platform 301 and the rotating support 302 on the outer periphery of the spline housing 3, and the second gasket 7 is located in the annular groove 304. For the convenience of assembling the second gasket 7, the second gasket 7 of the present invention is a two-piece splicing type with radial butt joints. The two parts forming the second gasket 7 are respectively assembled into the annular groove 304 along the radial direction from both sides of the annular groove 304, and the two are mutually matched through the concave-convex structure at the butt joint surface and buckled together.

[0072] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content within the scope of the technical solution of the present invention to make equivalent embodiments of equivalent changes. However, as long as it does not depart from the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An anti-backward threaded connector, comprising a spline housing and a connecting nut, characterized in that: The outer periphery of the spline housing is provided with a rotating support, and the locking plate is rotatably supported on the rotating support, and an elastic reset member is provided between the locking plate and the spline housing for providing the locking plate with power to rotate in the counterclockwise direction; a locking cap is slidably provided on the outer periphery of the spline housing, and one side of the rear portion of the locking cap is provided with a long groove extending in the axial direction, and when the locking cap slides axially along the spline housing, the locking plate is located in the long groove, and when the locking cap slides to a position where the circumferential rotation is stopped by cooperating with the connecting nut through the concave-convex structure, the locking plate is pressed on the stop wall at the front end of the long groove under the action of the elastic reset member to prevent it from sliding backward; When the connecting nut needs to be rotated to unlock, the locking sheet can compress the elastic reset member under the action of external force to rotate clockwise, so that the locking cap can move backward and separate from the connecting nut.

2. The anti-backoff threaded connector according to claim 1, characterized in that: The stopping wall is an inclined surface. When the locking nut and the connecting nut are circumferentially stopped, the locking sheet is pressed on the stopping wall through the locking surface thereon.

3. The anti-backoff threaded connector according to claim 2, characterized in that: An unlocking surface and a limiting surface are provided above the locking surface in sequence. When the connecting nut is unlocked, the locking plate rotates clockwise so that the locking surface and the unlocking surface thereon are rotated into the locking cap. The locking cap can move axially backward over the locking surface and the unlocking surface. When the stopping wall is stopped by the limiting surface, the locking cap is completely separated from the connecting nut.

4. The anti-backoff threaded connector according to claim 3, characterized in that: When the stopping wall is stopped by the limiting surface, the unlocking surface is in a horizontal state, and is locked by matching with the locking protrusion on the inner wall of the locking cap through the locking groove on the unlocking surface.

5. The anti-backoff threaded connector according to claim 4, characterized in that: The limiting surface is an inclined surface that can be adapted to fit with the stopping wall.

6. The anti-backoff threaded connector according to claim 4, characterized in that: The locking cap is in a stepped hole structure with a larger front and a smaller rear, the long groove passes through the small hole end wall at the rear end and extends to the inner wall of the large hole end; the locking protrusion is located on the inner wall of the large hole end of the locking cap.

7. The anti-backoff threaded connector according to any one of claims 1 to 6, characterized in that: The outer periphery of the spline housing is also provided with a limiting piece for limiting the axial rearward displacement of the locking cap.

8. The anti-backoff threaded connector according to any one of claims 1 to 6, characterized in that: The elastic reset element is a torsion spring.

9. The anti-backoff threaded connector according to claim 8, characterized in that: The tail of the connecting nut is provided with a second ratchet, and the front end of the locking cap is provided with a first ratchet matched with the second ratchet.

10. The anti-backoff threaded connector according to claim 9, characterized in that: The locking sheet and the torsion spring are both connected to the rotating support through pins.

11. The anti-backoff threaded connector according to any one of claims 1-6, 9-10, characterized in that: The outer periphery of the spline housing is also provided with a ring platform, and a retaining ring is installed in the inner ring groove of the tail of the connecting nut. A second gasket is provided between the retaining ring and the ring platform. The outer periphery of the second gasket is a stepped shaft structure with a larger front and a smaller rear, and the outer periphery of the small-diameter part at the rear end is blocked by the inner periphery of the retaining ring to prevent it from escaping from the ring groove of the connecting nut; the second gasket is composed of two radially buckled parts, and the mutually buckled surfaces are provided with matching keys and grooves.

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