阅读说明：本技术 一种快速接头的锁紧装置 (Locking device of quick connector ) 是由 王鹏 于 2020-12-02 设计创作，主要内容包括：本发明提供一种快速接头的锁紧装置。该锁紧装置包括转动外环、销孔、定位销、弹簧、手柄和锁紧定位块,转动外环套设在固定内环上,可绕固定内环转动；定位销与手柄连接,销孔沿径向设置,弹簧套设在定位销上,销孔内和定位销上设有限位结构；转动外环的内侧沿圆周方向交替均布有凸台和凹槽,销孔穿过其中一个凸台；锁紧定位块放置在固定内环上设置的通孔内,锁紧定位块可沿径向在通孔内移动；锁紧定位块上设有定位孔。本发明另一种锁紧装置的方案是转动外环可沿固定内环轴向运动,转动外环的内侧与锁紧定位块的接触面为斜面设置。本发明的锁紧装置承压能力更强,可保证接头与槽车阳接头连接可靠,操作安全。(The invention provides a locking device of a quick connector. The locking device comprises a rotating outer ring, a pin hole, a positioning pin, a spring, a handle and a locking positioning block, wherein the rotating outer ring is sleeved on the fixed inner ring and can rotate around the fixed inner ring; the positioning pin is connected with the handle, the pin hole is arranged along the radial direction, the spring is sleeved on the positioning pin, and limit structures are arranged in the pin hole and the positioning pin; bosses and grooves are alternately and uniformly distributed on the inner side of the rotating outer ring along the circumferential direction, and a pin hole penetrates through one boss; the locking positioning block is placed in a through hole formed in the fixed inner ring and can move in the through hole along the radial direction; the locking positioning block is provided with a positioning hole. The other scheme of the locking device is that the rotating outer ring can axially move along the fixed inner ring, and the contact surface between the inner side of the rotating outer ring and the locking positioning block is arranged in an inclined plane. The locking device has stronger bearing capacity, can ensure that the joint is reliably connected with the tank car male joint, and is safe to operate.)

1. A locking device of a quick connector comprises a valve, a fixed inner ring and a sleeve, wherein the valve is arranged in the sleeve, and the sleeve is connected with the fixed inner ring; the locking device is characterized by comprising a rotating outer ring, a pin hole, a positioning pin, a spring, a handle and a locking positioning block, wherein the rotating outer ring is sleeved on the fixed inner ring and can rotate around the fixed inner ring; the positioning pin is connected with the handle, the pin hole is arranged along the radial direction, the spring is sleeved on the positioning pin, and limit structures are arranged in the pin hole and the positioning pin; bosses and grooves are alternately and uniformly distributed on the inner side of the rotating outer ring along the circumferential direction, and the pin hole penetrates through one of the bosses; the locking positioning block is placed in a through hole formed in the fixed inner ring and can move in the through hole along the radial direction; and the locking positioning block is provided with a positioning hole.

2. A locking device of a quick connector comprises a valve, a fixed inner ring and a sleeve, wherein the valve is arranged in the sleeve, and the sleeve is connected with the fixed inner ring; the locking device is characterized by comprising a rotating outer ring, a pin hole, a positioning pin, a spring, a handle and a locking positioning block, wherein the rotating outer ring is sleeved on the fixed inner ring and can axially move along the fixed inner ring; the positioning pin is connected with the handle, the pin hole is arranged along the radial direction, the spring is sleeved on the positioning pin, and limit structures are arranged in the pin hole and the positioning pin; the locking positioning block is placed in a through hole formed in the fixed inner ring and can move in the through hole along the radial direction; the contact surface between the inner side of the rotating outer ring and the locking positioning block is an inclined plane; and the locking positioning block is provided with a positioning hole.

3. The locking device of a quick coupling as claimed in claim 2, wherein the rotating outer ring and the fixed inner ring are provided with anti-rotation protrusions and grooves for cooperation.

4. The locking device of a quick coupling according to claim 1 or 2, wherein a protruding platform is provided in the through hole, the locking positioning block is provided with a receiving groove, and a resetting device is provided between the platform and the receiving groove.

5. The locking device of a quick coupling according to claim 1 or 2, wherein the quick coupling further comprises a nut flange and a hand wheel which are fixedly connected; the sleeve comprises a guide inner ring and an outer ring, and the outer ring is arranged outside the guide inner ring and is connected with the nut flange; the rear end of the valve is of a screw rod structure, and threads are arranged inside the nut flange and matched with the threads on the screw rod structure; the edge of the end face of the fixed inner ring is provided with one or more guide holes, or the edge of the end face of the fixed inner ring and the edge of the end face of the guide inner ring are correspondingly provided with one or more guide holes; an interlocking limit guide rod is arranged in the guide hole; a guide thimble is fixed at the rear end of the interlocking limit guide rod, a spiral groove is formed in the outer surface of the outer ring, and the guide thimble is positioned in the spiral groove; the thread of the spiral groove is opposite to the thread direction of the screw structure.

6. The locking device of a quick coupling as claimed in claim 5, wherein the guiding hole is provided with an anti-rotation block, the front end of the interlocking limiting guide rod is provided with an anti-rotation groove, and the anti-rotation block is located in the anti-rotation groove.

7. The locking device of a quick connector as claimed in claim 5, wherein the edge of the end face of the rotary outer ring is provided with one or more locking holes.

8. The locking device of a quick coupling as claimed in claim 5, wherein the rear end of the guiding inner ring is provided with an anti-rotation post, the screw structure is provided with a first anti-rotation guiding groove, and the anti-rotation post is located in the first anti-rotation guiding groove.

9. The locking device of a quick coupling according to claim 1 or 2, wherein the valve is fixed with a sliding device which can drive the valve to slide along the axis in the guide inner ring; the fixed inner ring is provided with a limiting structure for limiting the movement of the valve; the valve is of a single valve core structure or a double valve core structure.

10. The locking device of a quick coupling according to claim 9, wherein the dual valve core structure comprises a sliding main valve core and a screw sub valve core, wherein a cavity is formed at the rear end of the sliding main valve core, the front end of the screw sub valve core is inserted into the cavity, and a limiting device is arranged at the end of the cavity and used for limiting the sliding range of the front end of the screw sub valve core in the cavity; the front end of the sliding main valve core is provided with a pressure relief hole along the axis, or the rear end of the sliding main valve core is also provided with a pressure relief hole along the radial direction, and the pressure relief hole is communicated with the cavity.

Technical Field

The invention relates to a connecting joint for fluid conveying, in particular to a locking device of a quick joint for fluid loading and unloading.

Background

With the accelerated consumption of gas fuels such as natural gas, liquefied gas and the like and liquid chemical raw materials, the transportation volume is increased rapidly, and the environment protection situation is more severe. At present, the main modes of inland transportation of gas fuel and chemical raw materials are pipeline transportation and tank car filling transportation, and the loading and unloading of materials are involved in the tank car filling transportation process. The traditional assembling and disassembling process mostly adopts the ball valve to be matched with the conventional wrench type quick joint for connection.

The locking device of the existing wrench type quick connector is a wrench with a cam structure, the wrench is distributed on two sides of the connector, when in butt joint, a person needs to pull the wrench, and the wrench is locked by utilizing a groove of a standard male connector of a tank clamped by a cam on the wrench. In 2017, liquefied hydrocarbon explosion accidents happen in mountain-east near-Yi Jinyu petrochemical industry, 10 dead people and 9 dead people are seriously injured, and the direct reason is caused by leakage caused by falling of the wrench type quick joint during unloading operation. Once the wrench type quick connector falls off during the loading and unloading operation, the liquefied hydrocarbon is rapidly gasified to form an explosion space. In order to avoid the falling of the joint during the loading and unloading operation and avoid accidents such as fire explosion, personal injury and the like, a safer and more reliable quick joint locking device is needed to ensure the long-period safe operation of the loading and unloading operation.

Chinese patent CN109386679A provides a safety quick coupling, in which a locking rod is disposed on a female coupling, and when the locking rod is abutted with a male coupling, the locking rod is automatically inserted into a slot at the tail of the male coupling by the pre-tightening force of a spring. When the locking rod is disengaged, the locking rod needs to be lifted manually to be pulled out of the tail clamping groove of the male connector, and then the female connector is operated further to be disengaged from the male connector. The locking device is complex in operation and unreliable in safety, and the female connector and the male connector are required to be matched and paired for use due to the fact that the clamping groove needs to be formed in the male connector of the vehicle end, namely the male connector of the vehicle end needs to be modified.

Disclosure of Invention

In order to solve or improve the problems in the prior art, the invention provides a locking device of a quick connector, which can ensure that the connector is reliably connected with a tank car male connector and the operation is safe.

The technical scheme adopted by the invention is as follows:

a locking device of a quick connector comprises a valve, a fixed inner ring and a sleeve, wherein the valve is arranged in the sleeve, and the sleeve is connected with the fixed inner ring; the locking device comprises a rotating outer ring, a pin hole, a positioning pin, a spring, a handle and a locking positioning block, wherein the rotating outer ring is sleeved on the fixed inner ring and can rotate around the fixed inner ring; the positioning pin is connected with the handle, the pin hole is arranged along the radial direction, the spring is sleeved on the positioning pin, and limit structures are arranged in the pin hole and the positioning pin; bosses and grooves are alternately and uniformly distributed on the inner side of the rotating outer ring along the circumferential direction, and the pin hole penetrates through one of the bosses; the locking positioning block is placed in a through hole formed in the fixed inner ring and can move in the through hole along the radial direction; and the locking positioning block is provided with a positioning hole.

The invention discloses another locking device of a quick connector, wherein the quick connector comprises a valve, a fixed inner ring and a sleeve, the valve is arranged in the sleeve, and the sleeve is connected with the fixed inner ring; the locking device comprises a rotating outer ring, a pin hole, a positioning pin, a spring, a handle and a locking positioning block, wherein the rotating outer ring is sleeved on the fixed inner ring and can axially move along the fixed inner ring; the positioning pin is connected with the handle, the pin hole is arranged along the radial direction, the spring is sleeved on the positioning pin, and limit structures are arranged in the pin hole and the positioning pin; the locking positioning block is placed in a through hole formed in the fixed inner ring and can move in the through hole along the radial direction; the contact surface between the inner side of the rotating outer ring and the locking positioning block is an inclined plane; and the locking positioning block is provided with a positioning hole. And the rotating outer ring and the fixed inner ring are provided with anti-rotating lugs and grooves which are matched with each other.

Further, a convex platform is arranged in the through hole, a containing groove is formed in the locking positioning block, and a reset device is arranged between the platform and the containing groove.

Furthermore, the quick connector also comprises a nut flange and a hand wheel which are fixedly connected; the sleeve comprises a guide inner ring and an outer ring, and the outer ring is arranged outside the guide inner ring and is connected with the nut flange; the rear end of the valve is of a screw rod structure, and threads are arranged inside the nut flange and matched with the threads on the screw rod structure; the edge of the end face of the fixed inner ring is provided with one or more guide holes, or the edge of the end face of the fixed inner ring and the edge of the end face of the guide inner ring are correspondingly provided with one or more guide holes; an interlocking limit guide rod is arranged in the guide hole; a guide thimble is fixed at the rear end of the interlocking limit guide rod, a spiral groove is formed in the outer surface of the outer ring, and the guide thimble is positioned in the spiral groove; the thread of the spiral groove is opposite to the thread direction of the screw structure.

Furthermore, the guide hole is internally provided with an anti-rotation block, the front end of the interlocking limiting guide rod is provided with an anti-rotation groove, and the anti-rotation block is positioned in the anti-rotation groove.

Further, the edge of the end face of the rotating outer ring is provided with one or more locking holes.

Furthermore, the rear end of the guide inner ring is provided with an anti-rotation column, the screw structure is provided with a first anti-rotation guide groove, and the anti-rotation column is located in the first anti-rotation guide groove.

Furthermore, a sliding device is fixed on the valve and can drive the valve to slide in the guide inner ring along the axis; the fixed inner ring is provided with a limiting structure for limiting the movement of the valve; the valve is of a single valve core structure or a double valve core structure. The double-valve-core structure comprises a sliding main valve core and a screw auxiliary valve core, wherein a cavity is formed in the rear end of the sliding main valve core, the front end of the screw auxiliary valve core is embedded in the cavity, and a limiting device is arranged at the end part of the cavity and used for limiting the sliding range of the front end of the screw auxiliary valve core in the cavity; the front end of the sliding main valve core is provided with a pressure relief hole along the axis, or the rear end of the sliding main valve core is also provided with a pressure relief hole along the radial direction, and the pressure relief hole is communicated with the cavity.

Compared with the prior art, the invention has the following specific advantages:

(1) the locking device has stronger bearing capacity, and the safety of the joint is ensured by arranging a plurality of locking blocks and changing the traditional two-claw contact locking into multi-claw contact locking.

(2) The locating pin can be used as a locking indication in the hole of the locking locating block when the acting force of the reset structure falls, and the locking indication and the hole are matched for use, so that the quick connector falling accident caused by the fact that personnel neglect is not locked and the vibration in the loading process can be avoided.

(3) The fixed inner ring of joint end connection size matches with conventional male joint completely, need not to reform transform the change to current tank wagon male joint, greatly reduced later stage transformation time and cost.

(4) The interlocking limiting guide rod which moves synchronously with the valve core is arranged and is matched with the locking device for use, the phenomenon that the joint is accidentally separated from the tank wagon end can not occur, and the safety and the reliability can be further improved.

(5) The invention adopts a double-valve core structure: the main valve core has large area, can allow a medium to pass through at large flow rate after being opened, has small area of the auxiliary valve core, and only allows the medium to pass through at small flow rate after being opened. The structure can balance the internal pressure of the tank car male joint and then reduce the starting force of the hand wheel, the design pressure can reach 5MPa, which is far higher than that of the dry joint on the market at present, and the filling requirement of most media is completely met.

(6) The components can be made of stainless steel corrosion-resistant materials, so that the applicable medium range of the joint is wide, and the joint can be used as long as the medium has corrosion and viscosity which are not very large.

Drawings

Fig. 1 is a schematic structural diagram of a joint in an embodiment of the present invention.

Fig. 2 is a schematic structural view of a stopper pin in the practice of the present invention.

FIG. 3 is a sectional view taken along line A-A, (B) B-B, (C) C-C and D-D in FIG. 1.

Fig. 4 is a schematic structural diagram of a fixed inner ring in an embodiment of the present invention, (a) a top view, and (b) a side view.

Fig. 5 is a schematic structural diagram of a locking positioning block in the embodiment of the present invention, (a) a top view, and (b) a screenshot of installation with a fixed inner ring.

FIG. 6 is a locking state diagram of the male joint of the joint and the tank car in the embodiment of the invention, (a) an integral structure, and (b) a sectional view from F to F.

Fig. 7 is a schematic view of another implementation structure of the locking device of the invention, wherein (a) the overall structure of the joint, (b) the cross section of the locking device, and (c) the cross section of the locking positioning block.

Fig. 8 is a schematic view of a joint structure using a single valve element according to the present invention.

In the figure, 1-a fixed inner ring, 2-a guide inner ring, 3-an outer ring, 4-a nut flange, 5-a hand wheel, 6-a mounting end, 7-a sliding main valve core, 8-a screw auxiliary valve core, 9-a cavity, 10-a limiting block, 11-a thread, 12-a liquid drainage guide post, 13-a pressure relief hole, 14-a stop block, 15-a guide piston, 16-a flow hole, 17-a sealing ring, 18-a rotating outer ring, 19-a pin hole, 20-a positioning pin, 21-a spring, 22-a handle, 23-a locking positioning block, 24-a limiting platform, 25-a boss, 26-a groove, 27-a positioning hole, 28-a through hole, 29-a platform, 30-a containing groove, 31-a return spring and 32-a limiting boss, 33-an anti-rotation guide column, 34-an anti-rotation guide groove, 35-a ball, 36-a screw plug, 37-a spiral groove, 38-a guide thimble, 39-an interlocking limit guide rod, 40-a locking hole, 41-a guide hole, 42-an anti-rotation block, 43-an anti-rotation groove, 44-a raceway outer ring, 45-a connecting end inner ring, 46-an anti-explosion retainer ring, 47-a male joint, 48-an anti-rotation column, 49-a limiting pin, 50-an anti-rotation lug and 51-an anti-rotation groove.

Detailed Description

The invention will be elucidated on the basis of an embodiment shown in the drawing.

Example 1

The locking device of the invention is used on a quick connector for fluid loading and unloading, as shown in fig. 1 and 3, the quick connector of the embodiment comprises the locking device, a double-valve structure, a fixed inner ring 1, a guide inner ring 2, an outer ring 3, a nut flange 4, a hand wheel 5 and a mounting end 6. The double-valve structure is positioned in the guide inner ring 2 and comprises a sliding main valve core 7 and a screw auxiliary valve core 8 which can axially translate along the joint. Wherein, the rear end of the sliding main valve core 7 is provided with a cavity 9, and the front end of the screw auxiliary valve core 8 is embedded in the cavity 9 and can slide in a certain range in the cavity 9. The end of the cavity 9 is provided with a limiting block 10 for limiting the sliding of the front end of the screw auxiliary valve core 8. When the valve structure is opened and closed, the bottom of the front end of the screw auxiliary valve core 8 is matched with the limiting block 10, so that delayed linkage of the screw auxiliary valve core 8 and the sliding main valve core 7 can be realized. The function of the stopper 10 can be realized by using other stopper devices, such as a retainer ring at the end of the cavity, or a stopper pin 49 structure as shown in fig. 2. The front end of the screw auxiliary valve core 8 is sleeved with a spring (or other elastic bodies) to assist the auxiliary valve core to open, and the rear end of the screw auxiliary valve core is of a screw structure with threads 11. The front end of the sliding main valve core 7 is provided with a drainage guide pillar 12, the two can be in an integrated structure or fixedly connected through other existing modes, and can also be movably connected, so that the drainage guide pillar 12 can be detached from the sliding main valve core 7, and the drainage guide pillars 12 with different lengths can be replaced to adapt to the inner cavities of male connectors with different depths. And pressure relief holes 13 are formed in the front ends of the liquid drainage guide pillar 12 and the sliding main valve element 7 along the axis or in the radial direction of the rear end of the sliding main valve element 7 at the same time, and the pressure relief holes 13 are communicated with the cavity 9. In this embodiment, a stopper 14 is further provided at the front end of the screw pair valve element 8, and when the valve is not opened, the stopper 14 blocks a relief hole 13 at the rear end of the sliding main valve element 7, and when the screw pair valve element 8 is opened, the relief hole 13 is exposed. A guide piston 15 is fixed on the sliding main valve core 7 and can synchronously slide along the axis of the joint in the guide inner ring 2 along with the sliding main valve core 7. In this embodiment, the outer diameter of the guide piston 15 is slightly smaller than the inner diameter of the guide inner ring 2, but other sliding structures such as a slider and a guide rail may be provided to realize the sliding of the sliding main valve element 7 in the guide inner ring 2. The guide piston 15 is also provided with a plurality of through holes 16 which facilitate the medium circulation. The outside of the sliding main valve core 7 is provided with a sealing ring 17 which can form a seal with the fixed inner ring 1, and the contact part of the front end of the screw auxiliary valve core 8 and the cavity of the sliding main valve core 7 is also provided with the sealing ring 17.

The locking device comprises a rotating outer ring 18, a pin hole 19, a positioning pin 20, a spring 21, a handle 22 and a locking positioning block 23, wherein the rotating outer ring 18 is sleeved on the fixed inner ring 1. The inner surface of the rotating outer ring 18 is a circumferential surface, the outer surface of the fixed inner ring 1 is a circumferential surface, and the two are sleeved to form a hole and shaft relationship, so that the rotating outer ring 18 can rotate around the fixed inner ring 1, and certainly, the rotation can be realized by adopting other modes. The positioning pin 20 is connected with the handle 22, the pin hole 19 is arranged along the radial direction, the spring 21 is sleeved on the positioning pin 20, and the limiting table 24 is arranged in the pin hole 19 and on the positioning pin 20, or other limiting structures can be adopted, such as combination limiting of a hole and a pin. Bosses 25 and grooves 26 are alternately and uniformly distributed on the inner side of the rotating outer ring 18 along the circumferential direction, and the pin hole 19 penetrates through one of the bosses 25. Wherein, the boss 25 is used for blocking or pushing the locking positioning block 23 to move along the radial direction of the joint, and the groove 26 is used for loosening and accommodating the locking positioning block 23. In the embodiment, three bosses 25 and three grooves 26 are alternately and uniformly distributed.

The locking positioning block 23 is provided with a positioning hole 27 which is matched with the positioning pin 20 for use. A through hole 28 is formed in the fixed inner ring 1 along the circumferential direction, a locking positioning block 23 is placed in the through hole 28, and the locking positioning block 23 can move in the through hole 28 along the radial direction. In order to prevent the lock positioning block 23 from falling off from the through hole 28, the present embodiment provides two preferable implementations: (1) the cross sections of the through hole 28 and the locking positioning block 23 are both set to be conical, and the size of the locking positioning block 23 is larger than the conical opening of the through hole 28. (2) As shown in fig. 4 and 5, a convex platform 29 is arranged in the through hole 28, the locking and positioning block 23 is provided with a receiving groove 30, and a reset device is arranged between the platform 29 and the receiving groove 30, so that the connection between the locking and positioning block 23 and the fixed inner ring 1 can be ensured, and the locking and positioning block 23 can be reset into the groove 26 when the rotating outer ring 18 rotates to release the locking and positioning block 23. The resetting device of the embodiment adopts the compression resetting spring 31, and other resetting modes can be used as follows: magnet reset, spring leaf reset, torsion spring reset, etc.

The fixed inner ring 1 is fixedly connected with the guide inner ring 2 through bolts, and a limiting boss 32 (or other limiting structures, such as a check ring used at the end part) is arranged on the fixed inner ring 1 and used for limiting the displacement of the sliding main valve element 7. The inner side of the fixed inner ring 1 is provided with a sealing ring 17, and the sealing ring 17 is used for sealing the contact part of the fixed inner ring 1 and the vehicle-end male joint. The rear end of the guide inner ring 2 is provided with an anti-rotation guide post 33 along the radial direction, the screw of the screw auxiliary valve core 8 is provided with an anti-rotation guide groove 34, and the anti-rotation guide post 33 is placed in the anti-rotation guide groove 34 to prevent the rotation of the screw. The rotation preventing guide grooves 34 of the present embodiment are provided as a row of linear grooves in the joint axial direction.

The outer ring 3 is arranged outside the guide inner ring 2. In this embodiment, the inner surface of the rear end of the outer ring 3 is provided with a raceway, the outer circumferential surface of the rear end of the guide inner ring 2 is also provided with a raceway, and balls 35 are added into the raceways to form a similar bearing structure. And a dustproof sealing ring is arranged at the contact position of the outer ring 3 and the guide inner ring 2. The outer race 3 is provided with a plug screw 36 for injecting balls 35 and lubricating oil into the raceway. The outer surface of the outer ring 3 is provided with a spiral groove 37, and the rotation direction of the spiral groove 37 is opposite to the rotation direction of the screw auxiliary valve core thread 11. A guide thimble 38 is arranged in the spiral groove 37, and the guide thimble 38 is fixed at the end part of an interlocking limit guide rod 39. The end face circumferential edge of the rotating outer ring 18 is provided with a locking hole 40, the end face circumferential edge of the fixed inner ring 1 is provided with a guide hole 41, and when the end face circumferential edge of the guide inner ring 2 is larger than or equal to the end face circumferential edge of the fixed inner ring 1, the guide hole 41 is correspondingly arranged at the edge of the guide inner ring 2. The locking hole 40 of the rotating outer ring 18, the guide hole 41 of the fixed inner ring 1 and the guide inner ring 2 are aligned to receive the interlocking position limiting guide rod 39. The number of the locking holes 40 and the guiding holes 41 may be one or more, wherein the number and the positions of the locking holes 40 generally correspond to the number and the positions of the lock positioning blocks 23 in a one-to-one manner. The guide hole 41 is provided with an anti-rotation block 42, and the position of the anti-rotation block 42 is not limited (for example, the anti-rotation block can be arranged in the fixed inner ring 1, the anti-rotation block can be arranged in the guide inner ring 2, or both). An anti-rotation groove 43 is formed on the front end surface of the interlock limiter guide 39, and an anti-rotation block 42 is located in the anti-rotation groove to limit the rotation of the interlock limiter guide 39 and allow only the movement thereof along the axis of the guide hole 41.

The outer ring 3 and the hand wheel 5 are respectively connected with a nut flange 4. The hand wheel 5 and the nut flange 4 can be of an integrated structure. The nut flange 4 is internally provided with threads which are matched with the threads 11 of the screw auxiliary valve core 8, and the rear end of the nut flange 4 is also connected with the mounting end 6. The mounting end 6 comprises a raceway outer ring 44 and a connecting end inner ring 45, the raceway outer ring 44 is connected with the nut flange 4, and the tail end of the connecting end inner ring 45 is provided with threads or a flange so as to provide various optional connection modes for connecting with a user hose or a loading and unloading arm. The inner surface of the raceway outer ring 44 and the outer surface of the connecting end inner ring 45 are provided with raceways, balls 35 are added into the raceways, the raceway outer ring 44 is provided with a plug screw 36, and the contact part of the raceway outer ring 44 and the connecting end inner ring 45 is provided with a dustproof sealing ring. The joint end and the mounting end of the embodiment are both internally designed with bearing structures, so that the operating force of the hand wheel can be reduced. The inner side of the connecting end inner ring 45 is provided with an anti-rotation column 48, the anti-rotation column 48 is positioned in an anti-rotation guide groove 34 on the screw rod, and the anti-rotation column 48 of the connecting end inner ring 45 and the anti-rotation guide groove 34 used by the anti-rotation guide column 33 of the guide inner ring 2 can be the same linear groove or different linear grooves. Since the inner ring 45 of the connecting end is fixed after being mounted with the conveying equipment, the anti-rotation guide column 33 on the inner ring is also fixed. When the operating hand wheel 5 rotates, the nut flange 4 and the outer ring 3 fixed with the operating hand wheel synchronously rotate, the nut of the nut flange 4 is matched with the screw rod at the rear end of the auxiliary valve core by threads with the same specification to carry out spiral transmission, the spiral groove 37 of the outer ring 3 is matched with the guide thimble 38 of the interlocking limit guide rod 39 (the guide thimble 38 can move along the spiral groove 37), and when the operating hand wheel 5 rotates along a certain direction, the interlocking limit guide rod 39 and the screw rod auxiliary valve core 8 can move along the axial line of the joint in opposite directions. Because the rotation of the screw auxiliary valve core 8 is limited by the anti-rotation guide column 33, the screw can only move along the axial direction of the joint, thereby playing the anti-rotation effect. The rotation preventing guide groove 34 limits the rotation preventing column 48 on the guide inner ring 2 so that the rotation preventing column cannot be influenced by friction force and rotates along with the hand wheel 5, and the fixed inner ring 1 fixedly connected with the guide inner ring 2 cannot rotate. The nut flange 4 is also provided with a plurality of circulation holes 16 which are convenient for medium circulation. And sealing structures are arranged between the nut flange 4 and the guide inner ring 2 and between the nut flange 4 and the connecting end inner ring 45, and can isolate a medium channel from the outside.

An explosion-proof retainer ring 46 can be arranged at the foremost end of the joint, the explosion-proof retainer ring 46 is connected with the fixed inner ring 1, and the explosion-proof material is adopted, so that sparks generated by collision during butt joint can be prevented.

For the existing single valve core structure, when the valve core is in a closed state, medium pressure in the joint can be completely acted on the single valve core, if conversion is carried out according to working pressure of 2MPa, hundreds of kilograms of pulling force can be provided for opening the single valve core, and if the inner valve core is indirectly pulled by the rotation of a hand wheel, the starting force for rotating the hand wheel is very large. After the double-valve-core structure is adopted, the auxiliary valve core and the main valve core are in a nested relation, when the hand wheel 5 is rotated, the screw auxiliary valve core 8 is indirectly pulled open firstly, and medium pressure is discharged into a tank car male connector through the pressure relief hole 13, so that the front pressure and the rear pressure of the main valve core are balanced, the main valve core is hooked by the limiting block 10 after certain displacement of the auxiliary valve core, the auxiliary valve core is driven to be opened, the main valve core is mainly overcome by operating force, and the friction force is not medium pressure, and the starting force of the hand wheel 5 can be greatly reduced.

The following is a specific working procedure of a joint structure according to the present invention.

1. Before the male joint 47 of the tank car is butted, the joint is in a closed state (see fig. 1), at the moment, the end surface of the interlocking limit guide rod 39 is not inserted into the locking hole 40, the rotation of the locking handle 22 is not hindered, the locking handle 22 is rotated to enable the locking positioning block 23 to be in a release state (the corresponding position can be pasted with a character indication mark), and the preparation for car receiving is made.

2. After the male joint 47 of the tank car is initially butted, the locking handle 22 is rotated to enable the locking positioning block 23 to be in a locking state, namely, the male joint 47 of the tank car is locked (see fig. 6). The hand wheel 5 is rotated anticlockwise facing the tank car, the screw auxiliary valve core 8 is opened firstly, namely a displacement gap is generated between a sealing ring 17 at the front end of the screw auxiliary valve core 8 and a sealing surface of a cavity of the sliding main valve core 7. The pressure in the inner cavity of the joint is balanced with the pressure in the inner cavity of the tank car male joint 47 through the pressure relief hole 13, then the sliding main valve element 7 is driven to move rightwards to be in a fully opened state (the hand wheel 5 does not rotate), and meanwhile the interlocking limit guide rod 39 moves leftwards and gradually penetrates into the locking hole 40. At the moment, the inner cavity of the joint is communicated with the vehicle end male joint 47 and is isolated from the outside to be in a closed state, and then a groove vehicle end valve can be opened to carry out loading and unloading operations.

When the valve is opened, the locking positioning block 23 is in a locking state (see (b) diagram in fig. 6), and the interlocking limit guide rod 39 and the valve core move synchronously, that is, the valve core is opened, and the interlocking limit guide rod 39 is gradually inserted into the locking hole 40 on the rotating outer ring integrated with the locking handle 22, at this moment, in order to be separated from the vehicle end male connector, the operating handle 22 must be rotated by a certain angle to enable the locking positioning block 23 to be in a releasing state, and the operating handle 22 is limited by the interlocking limit guide rod 39 and cannot rotate, so that the phenomenon of accidental separation from the vehicle end cannot occur, and the phenomenon that the vehicle end is separated from the vehicle male connector 47 under pressure by manual misoperation can be.

3. After the loading and unloading of the tank car are finished, the hand wheel 5 is rotated clockwise facing the tank car, the sliding main valve core 7 gradually moves left to a closed state (until the hand wheel 5 does not rotate), the liquid discharge guide pillar 12 on the sliding main valve core 7 also synchronously moves left to extend into the inner cavity of the tank car male connector 47, and the interlocking limit guide rod 39 moves right to gradually exit the locking hole 40. Until the end surface of the interlocking limit guide rod 39 is flush with the right end surface of the locking hole 40, the shape and the volume of the front end structure of the drainage guide post 12 are basically consistent with (slightly smaller than) the inner cavity of the male joint, and the front end structure of the drainage guide post can occupy the residual liquid space after extending into the inner cavity of the male joint, namely the residual liquid in the inner cavity of the male joint can be extruded into a tank car or the inner cavity of the joint of the invention. At the moment, the inner cavity of the connector body is isolated from the outside and is in a closed state, the tank car end valve is closed, the pressure release valve on the side surface of the tank car male connector is opened, and then the locking handle 22 is rotated to release the locking positioning block 23 to disconnect the tank car male connector 47 (see a diagram (a) in fig. 3). The end face of the interlocking limit guide rod 39 is flush with the right end face of the locking hole 40 and can be used as an indication that the valve core is completely closed. Before the quick female joint is disconnected with the male joint of the tank car, most of residual liquid is sealed in the quick female joint or is extruded into the tank car by the liquid drainage guide post 12, so that the actual residual liquid is only the part in the gap between the liquid drainage guide post 12 and the male joint of the tank car, the discharge of the residual liquid can be greatly reduced after the quick female joint is disconnected, and the discharge of the residual liquid can be reduced by more than 90 percent compared with the conventional quick female joint on the market at present.

Example 2

This embodiment provides another structure of the locking device, and the structure of the other parts of the joint is the same as that of embodiment 1. As shown in fig. 7, the rotating outer ring 18 is sleeved on the fixed inner ring 1, and the rotating outer ring 18 can move in parallel along the axial direction of the fixed inner ring 1. The inner side of the rotating outer ring 18 and the surface of the locking positioning block 23 are both provided with inclined planes, one side of the inclined planes is high, and the other side of the inclined planes is low, so that the axial movement of the rotating outer ring 18 can push the locking positioning block 23 to move along the radial direction of the joint. Referring to fig. 7 (a), the rotating outer ring 18 is located at the rightmost side of the stroke, at this time, the lock positioning block 23 contacts the higher side of the inclined surface of the rotating outer ring 18, and is in a release state, when the rotating outer ring 18 is moved leftwards, the lock positioning block 23 is gradually moved downwards under the pushing of the inclined surface and is clamped in the groove of the grooved car male connector, and finally the positioning pin 20 falls into the positioning hole 27 of the lock positioning block 23, so that locking is realized. The rotation-preventing protrusions 50 and the rotation-preventing grooves 51 are provided on the rotation outer ring 18 and the fixed inner ring 1 to limit the rotation of the rotation outer ring 18.

The embodiments disclosed above are to be considered in all respects as illustrative and not restrictive. For example, the valve structure may adopt a single valve core structure as shown in fig. 8, and variations of these structures are within the scope of the present invention.