Quick-change connector valve element device

Abstract

The utility model discloses a quick-change connector valve core device, which relates to the technical field of agricultural machinery and comprises a male connector body (16) and a female connector body (2), the female connector body (2) is mounted on a tractor, the male connector body (16) is mounted on an agricultural implement, and the male connector body (16) and the female connector body (2) are connected in a pluggable manner; according to the utility model, the second valve core, the third valve core, the third spring and the fourth spring are arranged, so that a two-stage opening valve core structure can be realized, and the sealing reliability is improved; by arranging the oil cavity on the first connecting plug and the second valve element, the circulation sectional area of an oil port is increased, the defects that an original conical surface oil port is large in resistance and large in loss are overcome, the resistance when hydraulic oil flows is reduced, and the hydraulic output power is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of agricultural machinery, especially relates to a quick connector valve core device. BACKGROUND

[0002] The tractor needs to be connected through the quick connector when providing hydraulic output to the external farm implement. The tractor end is equipped with a female connector, and the implement end is equipped with a male connector. The characteristics require that the connection is easy to plug and unplug, the resistance is small when the hydraulic output, and the loss is small. The existing taper structure has a small oil port flow area when connected, and a large resistance when the hydraulic output. UTILITY MODEL CONTENTS

[0003] In view of the problems of the existing taper structure that the oil port flow area is small when connected and the resistance is large when the hydraulic output, the utility model aims to provide a quick connector valve core device.

[0004] In order to achieve the above purpose, the utility model adopts the technical scheme that:

[0005] A quick connector valve core device, comprising: a male connector body 16 and a female connector body 2, the female connector body 2 is installed on the tractor, the male connector body 16 is installed on the implement, and the male connector body 16 and the female connector body 2 are plug-connected;

[0006] The inside of the female connector body 2 is provided with a first path, a second path and a third path;

[0007] The first path, the second path and the third path are coaxially arranged and mutually communicated, a first annular limiting plate with a reduced inner diameter is arranged between the first path and the second path, and a second annular limiting plate with a reduced inner diameter is arranged between the second path and the third path;

[0008] The inside of the male connector body 16 is provided with a fourth path and a fifth path;

[0009] The fourth path and the fifth path are coaxially arranged and mutually communicated, a third annular limiting plate with a reduced inner diameter is arranged between the fourth path and the fifth path, and the end of the fourth path is provided with a fourth annular limiting plate;

[0010] Further comprising: a stop block 4, one stop block 4 is installed in the inside of the female connector body 2 and the male connector body 16;

[0011] The stop block 4 located in the female connector body 2 is arranged in the second path, one end of the stop block 4 abuts against the first annular limiting plate, the other end of the stop block 4 is provided with a first limiting assembly groove, and the groove bottom of the first limiting assembly groove is provided with a first passage communicated at both ends;

[0012] The block 4 located in the male joint body 16 is arranged in the fourth path, one end of the block 4 abuts against the third annular limiting plate, and the other end of the block 4 is provided with a second limiting assembly groove, and the groove bottom of the second limiting assembly groove is provided with a second passage in communication between two ends;

[0013] The first valve core 1 and the first spring 5 are further included, the first valve core 1 includes a first limiting rod, a first plug head plate and a first connecting plug, the first limiting rod, the first plug head plate and the first connecting plug are sequentially connected and coaxially arranged, the first limiting rod is slidingly installed in the first limiting assembly groove, the first spring 5 is sleeved on the first limiting rod, one end of the first spring 5 abuts against the block 4 in the second path, and the other end of the first spring 5 abuts against the first plug head plate, and the outer periphery of the first plug head plate matches the inner periphery of the second annular limiting plate;

[0014] The second valve core 11, the third valve core 12, the third spring 13, the fourth spring 14 and the fourth valve core 15 are further included, the second valve core 11 is slidingly installed in the fourth path, the second valve core 11 includes a first end cover and a first limiting cylinder, the first end cover is provided with a first through hole located at the axis center thereof, the first through hole matches the first connecting plug, the first end cover and the first limiting cylinder are connected and coaxially arranged, a plurality of second through holes are formed in the first limiting cylinder, and the outer periphery of the first end cover matches the inner periphery of the fourth annular limiting plate; the fourth spring 14 is sleeved on the first limiting cylinder, one end of the fourth spring 14 abuts against the second valve core 11, and the other end of the fourth spring 14 abuts against the block 4 in the fourth path; the third valve core 12 is slidingly installed in the second valve core 11, one end of the third valve core 12 matches the first end cover, the other end of the third valve core 12 is provided with a limiting column, one end of the fourth valve core 15 is slidingly installed in the second limiting assembly groove, the other end of the fourth valve core 15 is slidingly installed in the first limiting cylinder, the third spring 13 is arranged in the first limiting cylinder and sleeved on the limiting column, one end of the third spring 13 abuts against the third valve core 12, the other end of the third spring 13 abuts against the fourth valve core 15, and the fourth valve core 15 is provided with a third passage in communication between two ends;

[0015] The second spring 8 and the sheath 10 are further included, the outer wall of the female joint body 2 is provided with a fifth annular limiting plate with an increased outer diameter, the sheath 10 is sleeved on the outer wall of the female joint body 2, the inner periphery of the sheath 10 is provided with a sixth annular limiting plate, the second spring 8 is sleeved on the female joint body 2 and arranged in the sheath 10, one end of the second spring 8 abuts against the fifth annular limiting plate, and the other end of the second spring 8 abuts against the sixth annular limiting plate;

[0016] The steel balls 9 are further included, the outer wall of the female joint body 2 is provided with a plurality of third through holes, the plurality of third through holes are located at the outer periphery of the third path, and one steel ball 9 is slidingly installed in each third through hole; when the male joint body 16 is assembled in the female joint body 2, the plurality of steel balls 9 are located between the male joint body 16 and the sheath 10, and the sixth annular limiting plate is located at the outer periphery of the plurality of steel balls 9.

[0017] The outer wall of the male connector body 16 is provided with an annular limiting groove matched with the plurality of steel balls 9.

[0018] The quick connector valve core device, wherein the second path of the female connector body 2 is provided with a crude oil cavity A with an increased inner diameter, and the side wall of the first connecting plug is provided with an oil cavity B.

[0019] The quick connector valve core device, wherein the groove wall of the annular limiting groove is inclined.

[0020] The quick connector valve core device, wherein the inner end of each third through hole has a smaller diameter than the outer diameter of the steel ball 9.

[0021] The quick connector valve core device, further comprising a first check ring 3, and one first check ring 3 is installed in the interior of the female connector body 2 and the male connector body 16.

[0022] The first check ring 3 located in the female connector body 2 is assembled between the stop block 4 in the second path and the first annular limiting plate.

[0023] The first check ring 3 located in the male connector body 16 is assembled between the stop block 4 in the fourth path and the third annular limiting plate.

[0024] The quick connector valve core device, further comprising a first sheath sealing ring, the first sheath sealing ring is sleeved on the outer wall of the female connector body 2 and abuts against the fifth annular limiting plate, and the first sheath sealing ring is used for sealing between the female connector body 2 and the sheath 10.

[0025] The quick connector valve core device, further comprising a second sheath sealing ring, the second sheath sealing ring is sleeved on the outer wall of the female connector body 2, and the second sheath sealing ring is used for limiting the sixth annular limiting plate and sealing between the female connector body 2 and the sheath 10.

[0026] The quick connector valve core device, further comprising a double-layer sealing ring, the double-layer sealing ring is installed on the inner wall of the female connector body 2 and located in the third path, and the double-layer sealing ring is used for sealing between the male connector body 16 and the female connector body 2 when the male connector body 16 is assembled in the female connector body 2.

[0027] The quick connector valve core device, wherein the two stop blocks 4 are both multi-piece fan blade structures with front and rear communication.

[0028] The quick connector valve core device, wherein the inner periphery of the second annular limiting plate is a stepped structure, the inner periphery of the fourth annular limiting plate is a stepped structure, and the outer periphery of the sheath 10 is provided with a groove for easy operation.

[0029] The utility model discloses a valve core device of quick change connector which is characterized by the following technical scheme.

[0030] (1) In the utility model, through setting up second valve core and third valve core and third spring and fourth spring, two-stage opening valve core structure can be realized, and the sealing reliability is increased.

[0031] (2) In the utility model, through setting up the structure of oil cavity on first connecting plug and second valve core, the oil port flow area is increased, the original conical surface oil port resistance and loss are solved, the hydraulic oil flow resistance is reduced, and the hydraulic output power is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a structure schematic view of a valve core device of quick change connector.

[0033] Figure 2 It is a structure schematic view of a female connector body of a valve core device of quick change connector.

[0034] Figure 3 It is a structure schematic view of a male connector body of a valve core device of quick change connector.

[0035] In the drawing: 1, first valve core;2, female connector body;3, first stop ring;4, stop block;5, first spring;6, second stop ring;7, sealing ring;8, second spring;9, steel ball;10, sheath;11, second valve core;12, third valve core;13, third spring;14, fourth spring;15, fourth valve core;16, male connector body;A, original oil cavity;B, oil cavity. DETAILED DESCRIPTION

[0036] The utility model will be further described in connection with the drawings and specific embodiment, but not as the limitation of the utility model.

[0037] Please refer to Figures 1 to 3 It shows a valve core device of quick change connector, wherein, including: male connector body 16 and female connector body 2, female connector body 2 is installed on tractor, male connector body 16 is installed on farm implement, and male connector body 16 and female connector body 2 are inserted and connected;

[0038] The inside of female connector body 2 is equipped with first path, second path and third path;

[0039] First path, second path and third path are coaxially arranged and mutually communicated, and first annular limiting plate with reduced inner diameter is arranged between first path and second path, and second annular limiting plate with reduced inner diameter is arranged between second path and third path;

[0040] The inside of male connector body 16 is equipped with fourth path and fifth path.

[0041] The fourth path and the fifth path are coaxially arranged and communicated, and a third annular limiting plate with a reduced inner diameter is arranged between the fourth path and the fifth path, and the end of the fourth path is provided with the fourth annular limiting plate;

[0042] Further comprising: a stopper 4, one stopper 4 is arranged in the inner part of the female connector body 2 and the male connector body 16;

[0043] The stopper 4 arranged in the female connector body 2 is arranged in the second path, one end of the stopper 4 abuts against the first annular limiting plate, and the other end of the stopper 4 is provided with a first limiting assembly groove, and the groove bottom of the first limiting assembly groove is provided with a first passage communicated at two ends;

[0044] The stopper 4 arranged in the male connector body 16 is arranged in the fourth path, one end of the stopper 4 abuts against the third annular limiting plate, and the other end of the stopper 4 is provided with a second limiting assembly groove, and the groove bottom of the second limiting assembly groove is provided with a second passage communicated at two ends;

[0045] Further comprising: a first valve core 1 and a first spring 5, the first valve core 1 comprises: a first limiting rod, a first plug plate and a first connecting plug, the first limiting rod, the first plug plate and the first connecting plug are sequentially connected and coaxially arranged, the first limiting rod is slidingly installed in the first limiting assembly groove, the first spring 5 is sleeved on the first limiting rod, one end of the first spring 5 abuts against the stopper 4 in the second path, the other end of the first spring 5 abuts against the first plug plate, and the outer periphery of the first plug plate matches the inner periphery of the second annular limiting plate;

[0046] Further comprising: a second valve core 11, a third valve core 12, a third spring 13, a fourth spring 14 and a fourth valve core 15, the second valve core 11 is slidingly installed in the fourth path, the second valve core 11 comprises: a first end cover and a first limiting cylinder, the first end cover is provided with a first through hole located at the axis thereof, the first through hole matches the first connecting plug, the first end cover and the first limiting cylinder are connected and coaxially arranged, a plurality of second through holes are arranged on the first limiting cylinder, and the outer periphery of the first end cover matches the inner periphery of the fourth annular limiting plate; the fourth spring 14 is sleeved on the first limiting cylinder, one end of the fourth spring 14 abuts against the second valve core 11, and the other end of the fourth spring 14 abuts against the stopper 4 in the fourth path; the third valve core 12 is slidingly installed in the second valve core 11, one end of the third valve core 12 matches the first end cover, the other end of the third valve core 12 is provided with a limiting column, one end of the fourth valve core 15 is slidingly installed in the second limiting assembly groove, the other end of the fourth valve core 15 is slidingly installed in the first limiting cylinder, the third spring 13 is arranged in the first limiting cylinder and sleeved on the limiting column, one end of the third spring 13 abuts against the third valve core 12, the other end of the third spring 13 abuts against the fourth valve core 15, and the fourth valve core 15 is provided with a third passage communicated at two ends;

[0047] Further comprising: the second spring 8 and the sheath 10, the outer wall of the female connector body 2 is provided with a fifth annular limiting plate with increased outer diameter, the sheath 10 is sleeved on the outer wall of the female connector body 2, the inner periphery of the sheath 10 is provided with a sixth annular limiting plate, the second spring 8 is sleeved on the female connector body 2 and located in the sheath 10, one end of the second spring 8 abuts against the fifth annular limiting plate, the other end of the second spring 8 abuts against the sixth annular limiting plate;

[0048] Further comprising: the steel ball 9, a plurality of third through holes are provided on the outer wall of the female connector body 2, the plurality of third through holes are located on the outer periphery of the third path, one steel ball 9 is slidably installed in each third through hole, when the male connector body 16 is assembled in the female connector body 2, the plurality of steel balls 9 are located between the male connector body 16 and the sheath 10, and the sixth annular limiting plate is located on the outer periphery of the plurality of steel balls 9.

[0049] The outer wall of the male connector body 16 is provided with an annular limiting groove, and the annular limiting groove is matched with the plurality of steel balls 9.

[0050] Further, in a preferred embodiment, the second path of the female connector body 2 is provided with a crude oil cavity A with an increased inner diameter, and the side wall of the first connecting plug is provided with an oil cavity B.

[0051] Further, in a preferred embodiment, the groove wall of the annular limiting groove is inclined.

[0052] Further, in a preferred embodiment, the inner end of each third through hole has a smaller diameter than the outer diameter of the steel ball 9.

[0053] Further, in a preferred embodiment, further comprising: the first check ring 3, one first check ring 3 is installed in the female connector body 2 and the male connector body 16.

[0054] The first check ring 3 located in the female connector body 2 is assembled between the stopper 4 in the second path and the first annular limiting plate.

[0055] The first check ring 3 located in the male connector body 16 is assembled between the stopper 4 in the fourth path and the third annular limiting plate.

[0056] Further, in a preferred embodiment, further comprising: the first sheath sealing ring, the first sheath sealing ring is sleeved on the outer wall of the female connector body 2 and abuts against the fifth annular limiting plate, and the first sheath sealing ring is used for sealing between the female connector body 2 and the sheath 10.

[0057] Further, in a preferred embodiment, further comprising: the second sheath sealing ring, the second sheath sealing ring is sleeved on the outer wall of the female connector body 2, and the second sheath sealing ring is used for limiting the sixth annular limiting plate and sealing between the female connector body 2 and the sheath 10.

[0058] Further, in a preferred embodiment, it further comprises a double-layer sealing ring, which is installed on the inner wall of the female connector body 2 and located in the third path, and is used for sealing between the male connector body 16 and the female connector body 2 when the male connector body 16 is assembled in the female connector body 2.

[0059] Further, in a preferred embodiment, the two stop blocks 4 are both multi-piece fan-shaped structures in communication front and back.

[0060] Further, in a preferred embodiment, the inner periphery of the second annular limiting plate is a stepped structure, the inner periphery of the fourth annular limiting plate is a stepped structure, and the outer periphery of the sheath 10 is provided with a recess for convenient operation.

[0061] The above is only a preferred embodiment of the utility model, and does not limit the implementation mode and protection scope of the utility model.

[0062] The utility model further has the following implementation modes on the basis of the above:

[0063] In a further embodiment of the utility model, the utility model provides a tractor hydraulic quick connector structure and device, adopts a two-stage opening valve core structure, increases the oil port flow cross-sectional area, solves the defects of large resistance and large loss of the original conical surface oil port, increases the sealing reliability, reduces the resistance when the hydraulic oil flows, and effectively improves the hydraulic output power.

[0064] In a further embodiment of the utility model, when in use, the male connector body 16 is inserted into the female connector body 2, at this time, the steel ball 9 and the sheath 10 lock the male connector body 16, the first valve core 1, the second valve core 11 and the third valve core 12 respectively overcome the action force of the first spring 5, the fourth spring 14 and the third spring 13 and move in the opposite direction, form the crude oil cavity A at the same time, and increase the oil cavity B. The oil port flow cross-sectional area is increased, the resistance when the hydraulic oil flows is reduced, and the hydraulic output power is effectively improved.

[0065] In a further embodiment of the utility model, the first valve core 1, the first spring 5 and the stop block 4 are sequentially installed in the female connector body 2 and are fixed by the first stop ring 3; the second stop ring 6, the second spring 8 and the steel ball 9 are sequentially installed outside the female connector body 2, and the sheath 10 is sleeved outside the female connector body 2 and is fixed by the second stop ring 6.

[0066] In a further embodiment of the utility model, the second valve core 11, the third valve core 12, the third spring 13, the fourth spring 14, the fourth valve core 15 and the stop block 4 are sequentially installed in the male connector body 16 and are fixed by the first stop ring 3.

[0067] In a further embodiment of the utility model, Figure 1The structure diagram for assembling the male connector body 16 in the female connector body 2 is shown in the figure, at this time, the first connecting plug is located in the first through hole and abuts against the third valve core 12, the first spring 5, the third spring 13 and the fourth spring 14 are all in the compressed state, the oil liquid in the tractor enters the crude oil cavity A through the block 4 in the female connector body 2 and enters the fourth path through the second annular limiting plate and the fourth annular limiting plate, then enters the farm implement after passing through the block 4 in the male connector body 16, and meanwhile, the oil liquid in the crude oil cavity A enters the second valve core 11 through the oil cavity B and enters the fourth path through the plurality of second through holes, then enters the farm implement after passing through the block 4 in the male connector body 16.

[0068] In the further embodiment of the utility model, through the structure of the oil cavity B on the first connecting plug and the second valve core 11, the oil port flow area is increased, the large resistance and large loss of the original conical surface oil port are solved, the resistance of the hydraulic oil flow is reduced, and the hydraulic output power is effectively improved.

[0069] In the further embodiment of the utility model, through the compression of the second spring 8 by the sliding sheath 10, the male connector body 16 is pulled out to the outside, so that the female connector body 2 and the male connector body 16 can be disassembled, and the disassembly is simple and convenient.

[0070] In the further embodiment of the utility model, the structure diagram of the female connector body 2 is shown in the figure, Figure 2 The structure diagram of the male connector body 16 is shown in the figure, Figure 3 The female connector body 2 is aligned with the male connector body 16 and is pushed into the male connector body 16, so that the female connector body 2 and the male connector body 16 can be assembled, as shown in the figure, Figure 1 The outer wall of the male connector body 16 is provided with an annular limiting groove, when the female connector body 2 is assembled in the male connector body 16, the plurality of steel balls 9 are located in the annular limiting groove, and under the action of the second spring 8, the sixth annular limiting plate on the sheath 10 abuts against the plurality of steel balls 9, so that the plurality of steel balls 9 are limited in the annular limiting groove, and the female connector body 2 and the male connector body 16 are prevented from being disconnected during the oil liquid conveying process, so that the oil liquid is prevented from leaking.

[0071] In the further embodiment of the utility model, the first block 4 in the female connector body 2 can be sealed with the female connector body 2 by arranging the first block 3 in the female connector body 2, and the first block 4 in the male connector body 16 can be sealed with the male connector body 16 by arranging the first block 3 in the male connector body 16.

[0072] In the further embodiment of the utility model, the structure diagram of the female connector body 2 is shown in the figure, Figure 2As shown, under the action of the first spring 5, the outer periphery of the first plug plate abuts against the inner periphery of the second annular limiting plate, thereby realizing the sealing of the female connector body 2, and when the female connector body 2 is in a disassembled state, oil leakage does not occur, and the inner periphery of the second annular limiting plate is provided with a stepped structure, thereby increasing the sealing performance between the first plug plate and the second annular limiting plate.

[0073] In a further embodiment of the utility model, the structure diagram of the male connector body 16 is as shown in the figure Figure 3 As shown, under the action of the fourth spring 14, the outer periphery of the first end cover abuts against the inner periphery of the fourth annular limiting plate, thereby realizing the sealing of the second valve core 11 and the male connector body 16, and the inner periphery of the fourth annular limiting plate is provided with a stepped structure, thereby increasing the sealing performance between the first end cover and the fourth annular limiting plate.

[0074] In a further embodiment of the utility model, the structure diagram of the male connector body 16 is as shown in the figure Figure 3 As shown, under the action of the third spring 13, the third valve core 12 abuts against the first end cover and realizes the sealing of the first through hole, and the end portion of the third valve core 12 is provided with a stepped structure, thereby increasing the sealing performance between the third valve core 12 and the first end cover.

[0075] In a further embodiment of the utility model, the groove wall of the annular limiting groove is provided in an inclined manner, thereby facilitating the moving in and out of the plurality of steel balls 9 into and out of the annular limiting groove.

[0076] In a further embodiment of the utility model, the outer periphery of the sheath 10 is provided with a groove for facilitating operation, thereby facilitating the hand gripping and pushing.

[0077] In a further embodiment of the utility model, when the sheath 10 slides and the second spring 8 is in a compressed state, the sixth annular limiting plate on the sheath 10 moves away from the outer side of the plurality of third through holes, and the plurality of steel balls 9 can move outward along the third through hole, at this time, the male connector body 16 is pulled, and the male connector body 16 can move out of the female connector body 2, at this time, the inner wall of the sheath 10 is still located on the outer side of the plurality of steel balls 9, the plurality of steel balls 9 are limited by the inner wall of the sheath 10, thereby avoiding the plurality of steel balls 9 from falling off the female connector body 2, and at the same time, the inner end aperture of each third through hole is smaller than the outer diameter of the steel ball 9, after the male connector body 16 moves out of the female connector body 2, the plurality of steel balls 9 will not fall off from the third through hole.

[0078] In a further embodiment of the utility model, after the male connector body 16 moves out of the female connector body 2, the first spring 5 can realize the resetting of the female connector body 2, and the third spring 13 and the fourth spring 14 can realize the resetting of the male connector body 16.

[0079] In a further embodiment of the utility model, by providing the second valve core 11 and the third valve core 12 and the third spring 13 and the fourth spring 14, a two-stage opening valve core structure can be realized, thereby increasing the sealing reliability.

[0080] The above are only preferred embodiments of the present invention and do not limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A quick-change joint valve core device, characterized in that: include: A male connector body (16) and a female connector body (2), wherein the female connector body (2) is mounted on a tractor, and the male connector body (16) is mounted on an agricultural implement, and the male connector body (16) and the female connector body (2) are connected by plugging and unplugging; A first path, a second path and a third path are provided inside the female connector body (2); The first path, the second path and the third path are coaxially arranged and interconnected, a first annular limiting plate with a reduced inner diameter is provided between the first path and the second path, and a second annular limiting plate with a reduced inner diameter is provided between the second path and the third path; A fourth path and a fifth path are provided inside the male connector body (16); The fourth path and the fifth path are coaxially arranged and interconnected, a third annular limiting plate with a reduced inner diameter is provided between the fourth path and the fifth path, and a fourth annular limiting plate is provided at the end of the fourth path; It also includes: a stopper (4), wherein a stopper (4) is installed inside the female connector body (2) and the male connector body (16); A stopper (4) located in the female connector body (2) is arranged in the second path, one end of the stopper (4) abuts against the first annular limiting plate, the other end of the stopper (4) is provided with a first limiting assembly groove, and the bottom of the first limiting assembly groove is provided with a first passage with two ends connected; A stopper (4) located in the male connector body (16) is arranged in the fourth path, one end of the stopper (4) abuts against the third annular limiting plate, the other end of the stopper (4) is provided with a second limiting assembly groove, and the bottom of the second limiting assembly groove is provided with a second passage with both ends connected; The valve core (1) further comprises a first valve core (1) and a first spring (5), wherein the first valve core (1) comprises a first limiting rod, a first plugging plate and a first connecting plug, wherein the first limiting rod, the first plugging plate and the first connecting plug are sequentially connected and coaxially arranged, wherein the first limiting rod is slidably mounted in the first limiting assembly groove, the first spring (5) is sleeved on the first limiting rod, one end of the first spring (5) abuts against the stopper (4) in the second path, and the other end of the first spring (5) abuts against the first plugging plate, and the outer periphery of the first plugging plate matches the inner periphery of the second annular limiting plate; The valve body (15) further comprises: a second valve core (11), a third valve core (12), a third spring (13), a fourth spring (14) and a fourth valve core (15); the second valve core (11) is slidably installed in the fourth path; the second valve core (11) comprises: a first end cover and a first limiting cylinder; the first end cover is provided with a first through hole located at its axis; the first through hole matches the first connecting plug; the first end cover and the first limiting cylinder are connected and coaxially arranged; a plurality of second through holes are provided on the first limiting cylinder; the outer periphery of the first end cover matches the inner periphery of the fourth annular limiting plate; the fourth spring (14) is sleeved on the first limiting cylinder; one end of the fourth spring (14) is against the second valve core (11); the fourth spring (14) is provided ... The other end of the spring (14) abuts against the block (4) in the fourth path; the third valve core (12) is slidably installed in the second valve core (11), one end of the third valve core (12) matches the first end cover, the other end of the third valve core (12) is provided with a limiting column, one end of the fourth valve core (15) is slidably installed in the second limiting assembly groove, the other end of the fourth valve core (15) is slidably installed in the first limiting cylinder, the third spring (13) is provided in the first limiting cylinder and sleeved on the limiting column, one end of the third spring (13) abuts against the third valve core (12), the other end of the third spring (13) abuts against the fourth valve core (15), and the fourth valve core (15) is provided with a third path with two ends connected; It also includes: a second spring (8) and a sheath (10); the outer wall of the female connector body (2) is provided with a fifth annular limiting plate with an increased outer diameter; the sheath (10) is sleeved on the outer wall of the female connector body (2); the inner periphery of the sheath (10) is provided with a sixth annular limiting plate; the second spring (8) is sleeved on the female connector body (2) and is arranged in the sheath (10); one end of the second spring (8) abuts against the fifth annular limiting plate, and the other end of the second spring (8) abuts against the sixth annular limiting plate; It also includes: a steel ball (9); a plurality of third through holes are provided on the outer wall of the female connector body (2); the plurality of third through holes are all located on the periphery of the third path; a steel ball (9) is slidably installed in each of the third through holes; when the male connector body (16) is assembled in the female connector body (2), the plurality of steel balls (9) are all located between the male connector body (16) and the sheath (10); and a sixth annular limiting plate is located on the periphery of the plurality of steel balls (9); An annular limiting groove is provided on the outer wall of the male connector body (16), and the annular limiting groove matches the plurality of steel balls (9).

2. The quick-change joint valve core device according to claim 1, characterized in that: The second path of the female connector body (2) is provided with a crude oil cavity (A) with an increased inner diameter, and the side wall of the first connecting plug is provided with an oil cavity (B).

3. The quick-change joint valve core device according to claim 1, characterized in that: The groove wall of the annular limiting groove is arranged inclined.

4. The quick-change joint valve core device according to claim 1, characterized in that: The inner end diameter of each third through hole is smaller than the outer diameter of the steel ball (9).

5. The quick-change joint valve core device according to claim 1, characterized in that: Also includes: A first retaining ring (3) is installed inside the female connector body (2) and the male connector body (16); A first retaining ring (3) located in the female connector body (2) is assembled between a stopper (4) in the second path and a first annular limiting plate; The first retaining ring (3) located in the male connector body (16) is assembled between the stopper (4) in the fourth path and the third annular limiting plate.

6. The quick-change joint valve core device according to claim 1, characterized in that: Also includes: A first sheath sealing ring is sleeved on the outer wall of the female connector body (2) and abuts against the fifth annular limiting plate. The first sheath sealing ring is used for sealing between the female connector body (2) and the sheath (10).

7. The quick-change joint valve core device according to claim 1, characterized in that: Also includes: A second sheath sealing ring is sleeved on the outer wall of the female connector body (2). The second sheath sealing ring is used to limit the sixth annular limiting plate and to seal between the female connector body (2) and the sheath (10).

8. The quick-change joint valve core device according to claim 1, characterized in that: Also includes: A double-layer sealing ring is installed on the inner wall of the female connector body (2) and is located in the third path. When the male connector body (16) is assembled in the female connector body (2), the double-layer sealing ring is used to seal between the male connector body (16) and the female connector body (2).

9. The quick-change joint valve core device according to claim 1, characterized in that: Both of the two stoppers (4) are multi-leaf fan-shaped structures that are connected front to back.

10. The quick-change joint valve core device according to claim 1, characterized in that: The inner circumference of the second annular limiting plate is a stepped structure, the inner circumference of the fourth annular limiting plate is a stepped structure, and the outer circumference of the sheath (10) is provided with a groove for easy operation.

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