Rotary joint for ultralow-temperature crane pipe

Abstract

The utility model provides a rotary joint for an ultralow-temperature crane pipe, which relates to the technical field of rotary joints and comprises an inner pipe, a second raceway is arranged on the outer wall of the inner pipe, an outer pipe is sleeved on the outer wall of the inner pipe, a third raceway is arranged on the inner wall of the outer pipe, and two protective covers penetrate through the inner wall of the outer pipe and are slidably mounted on the inner wall of the outer pipe. When the ball is replaced, a worker pulls the pull rod, the pull rod drives the clamping block to move through the connecting rod, the clamping block leaves the clamping groove, at the moment, the worker can pull out the protective cover, the ball can leave the second roller path and the third roller path, and then the worker places a new ball, resets the protective cover and loosens the pull rod. The elastic force of the first spring pushes the clamping block to enter the clamping groove, at the moment, the protective cover can be fixed, the outer wall of the protective cover is attached to the inner wall of the opening of the outer pipe, so that external dust can be prevented from entering the protective cover, and the protective cover can be prevented from being lost due to the arrangement of the connecting belt.

Description

Technical Field

[0001] The utility model relates to the technical field of swivel joints, in particular to a swivel joint for cryogenic loading arms. Background Art

[0002] The swivel joint is a key component of the loading arm. The swivel joint is also called the loading arm universal joint. It is machined by a precision CNC machine tool, with flexible rotation, light weight and reliability; it is generally applicable to the transmission of media with high temperature, low temperature and strong corrosiveness.

[0003] In the prior art, for example, an automatic swivel joint for a loading arm in Chinese Patent CN 220037790 U includes an inner ring sleeved outside an outer ring. Flanges are provided on the same side of the outer ring and the inner ring. The flange of the flange is arranged opposite to the flange of the outer ring and is connected by screws to provide a pressing force to be transmitted to the main seal ring. The main seal ring has good sealing performance to ensure that the medium passing through the swivel joint will not leak outside. An inner ring is sleeved inside the outer ring. A raceway is coupled between the outer wall of the inner ring and the inner wall of the outer ring. The rolling elements move in the raceway to convert the sliding friction between the outer ring and the inner ring into rolling friction, with small friction and reduced damage to the contact surface between the outer ring and the inner ring. A seal ring is also provided between the inner ring and the outer ring to prevent ultimate leakage of the medium and dust. A worm gear drive mechanism is circumferentially provided on the flange of the outer ring to mesh with a worm. The worm is driven by a drive motor, and the controller controls the start and stop of the drive motor to automatically control the rotation speed, rotation angle and final positioning of the horizontal loading arm, with accurate positioning. However, this patent still has the following problems.

[0004] In the above patent, although rolling elements are provided and the rolling elements move in the raceway to convert the sliding friction between the outer ring and the inner ring into rolling friction, with small friction and reduced damage to the contact surface between the outer ring and the inner ring, and injection holes and plugs are provided, after long-term use of the plug, the thread connection may be worn, which may cause foreign objects to enter the raceway, thus affecting rotation, and the plug is small and may be lost when removed. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the problems in the prior art that after long-term use of the plug, the thread connection may be worn, which may cause foreign objects to enter the raceway, thus affecting rotation, and the plug is small and may be lost when removed, and to propose a swivel joint for cryogenic loading arms.

[0006] To achieve the above object, the utility model adopts the following technical solutions: A cryogenic crane pipe swivel joint, including an inner pipe, wherein a second raceway is provided on the outer wall of the inner pipe, an outer pipe is sleeved on the outer wall of the inner pipe, a third raceway is provided on the inner wall of the outer pipe, two protective covers are penetrated and slidably installed on the inner wall of the outer pipe, a first raceway is provided on one side of each of the two protective covers facing each other, a card slot is provided on the outer wall of each of the two protective covers, two fixing blocks are fixedly installed on the outer wall of the outer pipe, a storage groove is provided on the outer wall of the fixing block, a first spring is fixedly installed on the inner wall of the storage groove, a clamping block is fixedly installed at one end of the first spring, a connecting rod is fixedly installed at one end of the clamping block close to the first spring, one end of the connecting rod penetrates through the fixing block and a pull rod is fixedly installed, balls are arranged inside the second raceway and the third raceway, and connecting bands are fixedly connected between the tops of the two protective covers and the outer wall of the outer pipe respectively.

[0007] Preferably, a first flange is fixedly installed on the outer wall of the outer pipe, a connecting pipe is arranged at one end of the outer pipe, and a second flange is fixedly installed on the outer wall of the connecting pipe.

[0008] Preferably, a plurality of uniformly distributed first threaded holes are provided at one end of the first flange close to the second flange, a second threaded hole is penetrated through the outer wall of the second flange, and a bolt is threadedly connected inside the second threaded hole.

[0009] Preferably, two slots are provided at one end of the first flange close to the second flange, a limiting groove is provided on the inner wall of the slot, a second spring is fixedly installed on the inner wall of the limiting groove, a connecting block is fixedly installed at one end of the second spring, a fixing rod is fixedly installed at one end of the connecting block close to the second spring, and one end of the fixing rod penetrates through the first flange and a pull plate is fixedly installed.

[0010] Preferably, two inserting plates are fixedly installed at one end of the second flange close to the slot, and connecting grooves are penetrated through the outer walls of the two inserting plates.

[0011] Preferably, a sealing groove is provided at one end of the outer pipe close to the connecting pipe, and a sealing ring is fixedly installed at one end of the connecting pipe close to the outer pipe.

[0012] Preferably, the outer wall of the clamping block fits with the inner wall of the card slot.

[0013] Compared with the prior art, the advantages and positive effects of the utility model are as follows.

[0014] 1. In the present utility model, when replacing the ball bearings, the staff member pulls the pull rod. The pull rod drives the clamping block to move through the connecting rod, and the clamping block leaves the clamping groove. At this time, the staff member can extract the protective cover, and the ball bearings can leave the second raceway and the third raceway. Then, the staff member places new ball bearings, resets the protective cover, and releases the pull rod. The elastic force of the first spring pushes the clamping block into the clamping groove, and at this time, the protective cover can be fixed. Moreover, since the outer wall of the protective cover fits with the inner wall of the opening of the outer tube, dust from the outside can be prevented from entering. Due to the provision of the connecting belt, the loss of the protective cover can be prevented.

[0015] 2. In the present utility model, when connecting, the staff member pulls two pull plates. The pull plates drive the connecting block into the limiting groove through the fixed rod, and the second spring is compressed. At this time, the plug enters the slot. When the connecting groove moves beside the connecting block, the staff member releases the pull plates. The connecting block enters the connecting groove under the elastic force of the second spring and fixes the plug. In this way, when the bolt loosens, the sealing performance can be prevented from decreasing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is an overall three-dimensional view of a rotating joint for a cryogenic crane pipe proposed by the present utility model;

[0017] Figure 2 is a cross-sectional view of the inner tube of a rotating joint for a cryogenic crane pipe proposed by the present utility model;

[0018] Figure 3 is a cross-sectional view of the fixing block of a rotating joint for a cryogenic crane pipe proposed by the present utility model;

[0019] Figure 4 is a cross-sectional view of the first flange of a rotating joint for a cryogenic crane pipe proposed by the present utility model.

[0020] Legend: 1. Inner tube; 2. Outer tube; 3. First flange; 4. Connecting pipe; 5. Second flange; 6. Protective cover; 7. Connecting belt; 8. Fixing block; 9. First threaded hole; 10. Second threaded hole; 11. Bolt; 12. Sealing groove; 13. Sealing ring; 14. First raceway; 15. Ball bearing; 16. Second raceway; 17. Third raceway; 18. Clamping groove; 19. Storage groove; 20. First spring; 21. Clamping block; 22. Connecting rod; 23. Pull rod; 24. Slot; 25. Plug; 26. Connecting groove; 27. Limiting groove; 28. Second spring; 29. Connecting block; 30. Fixed rod; 31. Pull plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] In order to more clearly understand the above-mentioned objects, features, and advantages of the present utility model, the present utility model will be further described below in conjunction with the drawings and embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0022] In the following description, many specific details are set forth in order to provide a thorough understanding of the present utility model. However, the present utility model may also be implemented in other ways different from those described herein. Therefore, the present utility model is not limited by the specific embodiments disclosed in the following specification.

[0023] Embodiment 1, as Figures 1-4 shown, the present utility model provides a cryogenic crane pipe swivel joint, which includes an inner pipe 1. A second raceway 16 is provided on the outer wall of the inner pipe 1. An outer pipe 2 is sleeved on the outer wall of the inner pipe 1. A third raceway 17 is provided on the inner wall of the outer pipe 2. Two protective covers 6 are installed through and slidably on the inner wall of the outer pipe 2. First raceways 14 are provided on the opposite sides of the two protective covers 6. Card slots 18 are provided on the outer walls of the two protective covers 6. Two fixing blocks 8 are fixedly installed on the outer wall of the outer pipe 2. A storage groove 19 is provided on the outer wall of the fixing block 8. A first spring 20 is fixedly installed on the inner wall of the storage groove 19. One end of the first spring 20 is fixedly installed with a clamping block 21. A connecting rod 22 is fixedly installed at the end of the clamping block 21 close to the first spring 20. One end of the connecting rod 22 penetrates through the fixing block 8 and is fixedly installed with a pull rod 23. Ball bearings 15 are arranged inside the second raceway 16 and the third raceway 17. Connecting bands 7 are fixedly connected between the tops of the two protective covers 6 and the outer wall of the outer pipe 2 respectively.

[0024] The effect achieved by the entire Embodiment 1 is that when replacing the ball bearings 15, the staff member pulls the pull rod 23. The pull rod 23 drives the clamping block 21 to move through the connecting rod 22. The clamping block 21 leaves the card slot 18. At this time, the staff member can pull out the protective cover 6, and the ball bearings 15 can leave the second raceway 16 and the third raceway 17. Then the staff member puts in new ball bearings 15, resets the protective cover 6, and releases the pull rod 23. The elastic force of the first spring 20 pushes the clamping block 21 to make it enter the card slot 18. At this time, the protective cover 6 can be fixed. And because the outer wall of the protective cover 6 fits with the inner wall of the opening of the outer pipe 2, dust from the outside can be prevented from entering. Due to the arrangement of the connecting band 7, the protective cover 6 can be prevented from being lost.

[0025] Embodiment 2, as Figures 1-4 shown, further, a first flange 3 is fixedly installed on the outer wall of the outer pipe 2. A connecting pipe 4 is arranged at one end of the outer pipe 2. A second flange 5 is fixedly installed on the outer wall of the connecting pipe 4.

[0026] Further, a plurality of uniformly distributed first threaded holes 9 are provided at one end of the first flange 3 close to the second flange 5. A second threaded hole 10 is penetrated through the outer wall of the second flange 5. A bolt 11 is threadedly connected inside the second threaded hole 10.

[0027] Further, two slots 24 are provided at one end of the first flange 3 close to the second flange 5. A limiting groove 27 is provided on the inner wall of the slot 24. A second spring 28 is fixedly installed on the inner wall of the limiting groove 27. One end of the second spring 28 is fixedly installed with a connecting block 29. One end of the connecting block 29 close to the second spring 28 is fixedly installed with a fixing rod 30. One end of the fixing rod 30 penetrates through the first flange 3 and is fixedly installed with a pulling plate 31.

[0028] Further, two inserting plates 25 are fixedly installed at one end of the second flange 5 close to the slot 24. Connecting grooves 26 are provided through the outer walls of the two inserting plates 25.

[0029] Further, a sealing groove 12 is provided at one end of the outer tube 2 close to the connecting tube 4. A sealing ring 13 is fixedly installed at one end of the connecting tube 4 close to the outer tube 2, further enhancing the sealing performance.

[0030] Further, the outer wall of the clamping block 21 fits with the inner wall of the clamping groove 18, preventing the protective cover 6 from shaking up and down after the clamping block 21 enters the clamping groove 18.

[0031] The overall effect achieved by the entire Embodiment 2 is that during connection, the staff pulls the two pulling plates 31. The pulling plates 31 drive the connecting block 29 into the limiting groove 27 through the fixing rod 30, and the second spring 28 is compressed. At this time, the inserting plate 25 enters the slot 24. When the connecting groove 26 moves beside the connecting block 29, the staff releases the pulling plates 31. The connecting block 29 enters the connecting groove 26 under the elastic force of the second spring 28, fixing the inserting plate 25. In this way, it can prevent the sealing performance from decreasing when the bolt 11 becomes loose.

[0032] Working principle: The outer tube 2, the inner tube 1 and the connecting tube 4 are all made of low-temperature resistant alloy steel, which can maintain good mechanical properties and sealing performance at extremely low temperatures. When replacing the ball 15, the staff pulls the pull rod 23, and the pull rod 23 drives the clamping block 21 to move through the connecting rod 22. The clamping block 21 leaves the clamping groove 18. At this time, the staff can pull out the protective cover 6, and the ball 15 can leave the second raceway 16 and the third raceway 17. Then the staff puts in a new ball 15, resets the protective cover 6, and releases the pull rod 23. The elastic force of the first spring 20 pushes the clamping block 21 to make it enter the clamping groove 18. At this time, the protective cover 6 can be fixed. And because the outer wall of the protective cover 6 fits with the inner wall of the opening of the outer tube 2, dust from the outside can be prevented from entering. Due to the setting of the connecting belt 7, the protective cover 6 can be prevented from being lost. When connecting, the staff inserts the bolt 11 into the first threaded hole 9 and the second threaded hole 10, so that the first flange 3 and the second flange 5 can be connected together. At the same time, the staff pulls two pull plates 31, and the pull plates 31 drive the connecting block 29 into the limiting groove 27 through the fixing rod 30, and the second spring 28 is compressed. At this time, the insertion plate 25 enters the insertion slot 24. When the connecting groove 26 moves beside the connecting block 29, the staff releases the pull plates 31, and the connecting block 29 enters the connecting groove 26 under the elastic force of the second spring 28, fixing the insertion plate 25. In this way, when the bolt 11 loosens, the sealing performance can be prevented from decreasing.

[0033] The above is only the preferred embodiment of the present invention, and it does not limit the present invention in other forms. Any person skilled in the art may use the technical content disclosed above to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical solution content 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 belong to the protection scope of the technical solution of the present invention.

Claims

1. A cryogenic crane pipe swivel joint, comprising an inner pipe (1), characterized in that: The outer wall of the inner tube (1) is provided with a second raceway (16). An outer tube (2) is sleeved on the outer wall of the inner tube (1). The inner wall of the outer tube (2) is provided with a third raceway (17). Two protective covers (6) are installed through and slidably on the inner wall of the outer tube (2). First raceways (14) are provided on the opposite sides of the two protective covers (6). Card slots (18) are provided on the outer walls of the two protective covers (6). Two fixing blocks (8) are fixedly installed on the outer wall of the outer tube (2). A storage groove (19) is provided on the outer wall of the fixing block (8). A first spring (20) is fixedly installed on the inner wall of the storage groove (19). A clamping block (21) is fixedly installed at one end of the first spring (20). A connecting rod (22) is fixedly installed at the end of the clamping block (21) close to the first spring (20). One end of the connecting rod (22) penetrates through the fixing block (8) and is fixedly installed with a pull rod (23). Ball bearings (15) are arranged inside the second raceway (16) and the third raceway (17). Connecting bands (7) are fixedly connected between the tops of the two protective covers (6) and the outer wall of the outer tube (2) respectively.

2. The rotating joint for cryogenic crane pipes according to claim 1, characterized in that: A first flange (3) is fixedly installed on the outer wall of the outer tube (2). A connecting pipe (4) is arranged at one end of the outer tube (2). A second flange (5) is fixedly installed on the outer wall of the connecting pipe (4).

3. The swivel joint for cryogenic crane pipes according to claim 2, characterized in that: A plurality of uniformly distributed first threaded holes (9) are provided at the end of the first flange (3) close to the second flange (5). A second threaded hole (10) penetrates through the outer wall of the second flange (5). A bolt (11) is threadedly connected inside the second threaded hole (10).

4. The swivel joint for cryogenic crane pipes according to claim 2, characterized in that: Two slots (24) are provided at the end of the first flange (3) close to the second flange (5). A limiting groove (27) is provided on the inner wall of the slot (24). A second spring (28) is fixedly installed on the inner wall of the limiting groove (27). A connecting block (29) is fixedly installed at one end of the second spring (28). A fixing rod (30) is fixedly installed at the end of the connecting block (29) close to the second spring (28). One end of the fixing rod (30) penetrates through the first flange (3) and is fixedly installed with a pull plate (31).

5. The swivel joint for cryogenic crane pipes according to claim 2, characterized in that: Two insertion plates (25) are fixedly installed at the end of the second flange (5) close to the slot (24). Connecting grooves (26) penetrate through the outer walls of the two insertion plates (25).

6. The swivel joint for cryogenic crane pipes according to claim 1, characterized in that: A sealing groove (12) is provided at the end of the outer tube (2) close to the connecting pipe (4). A sealing ring (13) is fixedly installed at the end of the connecting pipe (4) close to the outer tube (2).

7. The swivel joint for cryogenic crane pipes according to claim 1, characterized in that: The outer wall of the clamping block (21) is fitted with the inner wall of the card slot (18).

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