Pin joint type sling

Abstract

The utility model discloses a pin joint type sling which comprises a fork lug and an anchor cup, one end of the fork lug is provided with a pin hole, the other end of the fork lug is provided with a groove, and the groove is provided with an internal thread section. The outer ring of the anchor cup is provided with an external thread section matched with the internal thread section; wherein a sealing structure is arranged at the joint of the fork lug and the anchor cup. According to the pin joint type sling disclosed by the utility model, by changing the connection mode between the fork lug and the anchor cup, the problem of stress concentration at the threaded tool withdrawal groove is avoided, meanwhile, the problem that the core part of a threaded column cannot be completely quenched in the heat treatment process of the traditional fork lug is avoided, and the overall fatigue performance of the sling can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge slings, in particular to a pin-connected sling. Background Art

[0002] The pin-connected sling is a component that connects the main cable of a suspension bridge to the stiffening beam. It transfers the load of the stiffening beam to the main cable. Under the action of live load and temperature, the sling is prone to fatigue damage, especially the connection structure between the fork ear and the sling anchor cup, which generally adopts threaded connection, which is more prone to fatigue fracture risk.

[0003] At present, the fork ears of the pin-connected slings are generally provided with external threads, and the anchor cups are provided with internal threads that can be screwed together for connection. For example, Chinese patent CN215104685U discloses a suspension bridge sling connection structure, the specific structure of which is that the cable clamp ear plate is provided with a cylinder with external threads, the anchor cup is provided with a groove with internal threads, the cable clamp ear plate and the anchor cup are connected by the cooperation of internal and external threads, and a waterproof cover is provided at the connection between the upper fork ear plate and the upper anchor cup for waterproof sealing. In the above-mentioned prior art, the connecting ear plate and the external thread structure of the fork ear are in an integral form, resulting in a geometric mutation of the cross section at the thread back groove, which is prone to stress concentration under load and fatigue failure at the connection; and the external thread part of the fork ear is large in diameter to meet the force requirements, and the core is difficult to be fully hardened during the heat treatment process, resulting in a large deviation in the heat treatment hardness of the core and the outer surface of the screw part, component segregation and uneven mechanical properties, etc., which are factors affecting the fatigue performance of the fork ear. At the same time, the sealing and waterproofing effect between the fork ear and the anchor cup of the existing pin-connected sling is poor. Rainwater and water vapor can easily enter the anchor and the cable from the threaded connection, causing corrosion to the internal structure of the anchor, which is more likely to cause the cable to fail and endanger the safety of the bridge. Utility Model Content

[0004] In view of the above problems, the utility model provides a pin-connected sling, which aims to solve the problem that the ear plate with external threads in the sling connection structure in the prior art has a geometric mutation in cross-section at the thread backing groove, which is prone to stress concentration under load and fatigue failure at the connection. In order to meet the force requirements, the external thread part of the fork ear has a large diameter of the solid screw. During the heat treatment process, it is difficult to fully quench the core, resulting in a large deviation in the heat treatment hardness of the core and the outer surface of the screw, composition segregation and uneven mechanical properties, and factors affecting the fatigue performance of the fork ear.

[0005] The utility model adopts the following technical solutions to achieve the above purpose:

[0006] A pin-connected sling comprises a fork ear and an anchor cup, wherein one end of the fork ear is provided with a pin hole and the other end is provided with a groove, and the groove is provided with an internal thread section; the outer ring of the anchor cup is provided with an external thread section matching the internal thread section; wherein a sealing structure is provided at the connection between the fork ear and the anchor cup.

[0007] In the technical solution, by changing the connection method between the fork ear and the anchor cup, the traditional fork ear external thread and anchor cup internal thread connection structure is changed to a fork ear internal thread and anchor cup external thread connection structure, that is, the traditional fork ear thread column structure is changed to a threaded sleeve structure, which avoids the problem of geometric mutation of the cross-section at the thread back groove that is prone to stress concentration, and at the same time avoids the problem that the core of the thread column of the traditional fork ear cannot be completely hardened during the heat treatment process, which can improve the overall fatigue performance of the sling.

[0008] A further technical solution is that the sealing structure includes a sealing ring and a sealing pressure ring with an external thread; the internal thread section is provided with a first internal thread section that matches the external thread section of the anchor cup and a second internal thread section that matches the sealing pressure ring from the inside to the outside; the inner diameter of the first internal thread section is smaller than the inner diameter of the second internal thread section, and a limiting step for installing the sealing ring is provided between the first internal thread section and the second internal thread section; the sealing pressure ring is sleeved on the outer ring of the anchor cup and matches the thread of the second internal thread section, squeezing the sealing ring to deform and interference fit with the outer ring of the anchor cup. In this technical solution, the sealing pressure ring is connected to the second internal thread section of the fork ear through its external thread. After installation, the sealing pressure ring and the limiting step squeeze the sealing ring and deform it, forming a sealing structure between the fork ear and the anchor cup to achieve a water-blocking sealing effect.

[0009] A further technical solution is that the sealing structure includes a first sealing ring, a second sealing ring and a sealing cover installed at the connection between the fork ear and the anchor cup; one end of the sealing cover is located on the outer ring of the fork ear and is provided with an annular groove for installing the first sealing ring, and the other end is located on the outer ring of the anchor cup and is provided with an annular groove for installing the second sealing ring, and the first sealing ring and the second sealing ring are respectively interference fit with the outer ring of the fork ear and the outer ring of the anchor cup. In this technical solution, the outer wall of the connecting part of the fork ear and the outer wall of the anchor cup squeeze the first sealing ring and the second sealing ring and deform them by buckling the sealing cover, so as to form a sealing structure between the fork ear and the anchor cup, thereby achieving a water-blocking sealing effect.

[0010] A further technical solution is that the sealing cover is a Haversian structure, which facilitates the installation of the sealing cover at the connection between the fork ear and the anchor cup.

[0011] A further technical solution is that the outer wall of the fork ear is provided with an annular step, and one end of the sealing cover is installed on the annular step, so as to facilitate the positioning of the sealing cover during the installation process.

[0012] A further technical solution is that the side wall of the groove is a thin-walled structure. In this technical solution, under the condition of meeting the force requirements, the fork ear thread is a thin-walled structure, which can improve the hardenability of the material during heat treatment, reduce the hardness deviation of the inner and outer surfaces of the fork ear groove, make the overall mechanical properties of the product more uniform, and improve the overall fatigue performance of the sling.

[0013] The beneficial effects of the utility model are:

[0014] The utility model provides a pin-connected sling, which changes the connection method between the fork ear and the anchor cup, and changes the traditional fork ear external thread matching anchor cup internal thread connection structure into a fork ear internal thread matching anchor cup external thread connection structure, that is, changes the traditional fork ear thread column structure into a thread sleeve structure, thereby avoiding the problem of stress concentration caused by geometric mutation of the cross section at the thread backing groove, and at the same time avoiding the problem that the core of the thread column of the traditional fork ear cannot be completely hardened during the heat treatment process, thereby improving the overall fatigue performance of the sling; and a sealing structure is provided between the fork ear and the anchor cup, thereby achieving a water-blocking sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 : A schematic diagram of the structure of the pin-connected sling of the utility model.

[0016] Figure 2 for: Figure 1 A magnified schematic diagram of center A.

[0017] Figure 3 : A schematic diagram of the structure of the fork ear of the utility model.

[0018] Figure 4 : A schematic diagram of the sealing pressure ring described in the utility model.

[0019] Figure 5 : A schematic diagram of the structure of the anchor cup of the utility model.

[0020] Figure 6 Schematic diagram of the pin-connected sling structure of another embodiment of the present invention.

[0021] Figure 7 : A schematic diagram of the fork ear structure of another embodiment of the utility model.

[0022] Figure 8 : A schematic structural diagram of the sealing cover of the utility model.

[0023] In the figure:

[0024] 1. Fork ear; 10. Groove; 11. First internal thread section; 12. Second internal thread section; 13. Limiting step; 14. Internal thread section; 15. Annular step; 2. Anchor cup; 21. External thread section; 22. Cable body; 3. Sealing ring; 4. Sealing pressure ring; 41. Pressure ring external thread; 5. Sealing cover; 51. First annular groove; 52. Second annular groove; 61. First sealing ring; 62. Second sealing ring. DETAILED DESCRIPTION

[0025] The following is combined with Figures 1 to 8 The present invention is described in detail with specific implementation modes. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0026] like Figures 1 to 5 As shown, this embodiment provides a pin-connected sling, including a fork ear 1 and an anchor cup 2, wherein the fork ear 1 is provided with a pin hole at one end and a groove 10 at the other end, wherein the inner cavity of the groove 10 is cylindrical and provided with an internal thread section; the outer ring of the anchor cup 2 is provided with an external thread section 21 matching the internal thread section; wherein a sealing structure is provided at the connection between the fork ear 1 and the anchor cup 2;

[0027] Specifically, the sling in this embodiment is used to connect the beam end and the main cable, including a cable body 22, an anchor cup 2 at the beam end of the cable body 22, and a fork ear 1 connected to the anchor cup 2 by a thread, and the fork ear 1 is connected to the beam end or the main cable by the cooperation of the pin shaft and the pin hole; the sealing structure specifically includes a sealing ring 3 and a sealing pressure ring 4 with an external thread; the internal thread section is provided with a first internal thread section 11 that cooperates with the external thread section 21 of the anchor cup 2, and a second internal thread section 12 that cooperates with the pressure ring external thread 41 of the sealing pressure ring from the inside to the outside; the inner diameter of the first internal thread section 11 is smaller than the inner diameter of the second internal thread section 22, and a limiting step 13 for installing the sealing ring 3 is provided between the first internal thread section 11 and the second internal thread section 22; the sealing pressure ring 4 is sleeved on the outer ring of the anchor cup 2 and threadedly cooperates with the second internal thread section 12 to squeeze the sealing ring 3 The sealing ring 4 is connected with the second internal thread section 12 of the fork ear 1 by means of its external thread 41. After installation, the sealing ring 4 and the limiting step 13 squeeze the sealing ring 3 and deform it, thereby forming a sealing structure between the fork ear 1 and the anchor cup 2 to achieve a water-blocking sealing effect. At the same time, by changing the connection method between the fork ear 1 and the anchor cup 2, the traditional connection structure of the external thread of the fork ear 1 and the internal thread of the anchor cup 2 is changed to a connection structure of the internal thread of the fork ear 1 and the external thread of the anchor cup 2, that is, the traditional threaded column structure of the fork ear 1 is changed to a threaded sleeve structure, thereby avoiding the problem of stress concentration caused by geometric mutation of the cross section at the thread backing groove and avoiding the problem that the core of the threaded column of the traditional fork ear 1 cannot be completely hardened during the heat treatment process, thereby improving the overall fatigue performance of the sling.

[0028] Another embodiment is different from the above embodiment in that the specific sealing structure and the inner wall of the groove 10 only includes an internal thread section 14 for cooperating with the external thread section 21 of the anchor cup 2, such as Figures 6 to 8 As shown, the sealing structure specifically includes a first sealing ring 61, a second sealing ring 62 and a sealing cover 5 installed at the connection between the fork ear 1 and the anchor cup 2; one end of the sealing cover 5 is located at the outer ring of the fork ear 1 and is provided with an annular groove 51 for installing the first sealing ring 61, and the other end is located at the outer ring of the anchor cup 2 and is provided with an annular groove 52 for installing the second sealing ring 62, and the first sealing ring 61 and the second sealing ring 62 are respectively interference fit with the outer ring of the fork ear 1 and the outer ring of the anchor cup 2; wherein the sealing cover 5 can specifically be a Haversian structure, for example, a two-half structure buckled at the connection between the fork ear 1 and the anchor cup 2, the opposite end faces on one side are connected by a rotating shaft, and the opposite end faces on the other side are fixedly connected by fixing bolts, so that the buckled sealing cover 5 is realized to squeeze the first sealing ring 61 and the second sealing ring 62 and deform them, so as to form a sealing structure between the fork ear 1 and the anchor cup 2 to achieve a water-blocking sealing effect. In addition, the sealing cover 5 can also be a completely split two-half structure, with both ends fixedly connected by fixing bolts, or an integral structure with a certain elastic deformation, such as rubber, silicone and other materials, which is directly sleeved on the connection.

[0029] In another embodiment, in order to further facilitate the positioning and installation of the sealing cover, an annular step 15 is provided on the outer wall of the fork ear 1 , and one end of the sealing cover 5 is installed on the annular step 15 .

[0030] Another embodiment, based on the above embodiment, the side wall of the groove 10 is a thin-walled structure. Under the condition of meeting the force requirements, the inner thread of the fork ear 1 is a thin-walled structure, which can improve the hardenability of the material during heat treatment and reduce the hardness deviation of the inner and outer surfaces of the fork ear 1 groove 10, so that the overall mechanical properties and mechanical properties of the product are more uniform, thereby improving the overall fatigue performance of the sling.

[0031] The utility model provides a pin-connected sling, which changes the connection method between the fork ear 1 and the anchor cup 2, and changes the traditional connection structure of the fork ear 1 external thread and the anchor cup 2 internal thread to a connection structure of the fork ear 1 internal thread and the anchor cup 2 external thread, that is, the traditional fork ear thread column structure is changed into a thread sleeve structure, thereby avoiding the problem of stress concentration caused by geometric mutation of the cross section at the thread backing groove, and at the same time avoiding the problem that the core of the thread column of the traditional fork ear cannot be completely hardened during the heat treatment process, thereby improving the overall fatigue performance of the sling; and a sealing structure is provided between the fork ear 1 and the anchor cup 2, which can achieve a water-blocking sealing effect.

Claims

1. A pin-jointed sling, comprising a fork ear and an anchor cup, characterized in that: The fork ear has a pin hole at one end and a groove at the other end, wherein the groove has an internal thread section; the outer ring of the anchor cup has an external thread section matching the internal thread section; wherein a sealing structure is provided at the connection between the fork ear and the anchor cup.

2. A pin-connected sling according to claim 1, characterized in that: The sealing structure comprises a sealing ring and a sealing pressure ring provided with external threads; The internal thread section is provided with a first internal thread section cooperating with the external thread section of the anchor cup and a second internal thread section cooperating with the sealing pressure ring from the inside to the outside; The inner diameter of the first internal thread section is smaller than the inner diameter of the second internal thread section, and a limiting step for installing a sealing ring is provided between the first internal thread section and the second internal thread section; the sealing pressure ring is sleeved on the outer ring of the anchor cup and cooperates with the thread of the second internal thread section, and the sealing ring is squeezed and deformed to have an interference fit with the outer ring of the anchor cup.

3. A pin-jointed sling according to claim 1, characterized in that: The sealing structure includes a first sealing ring, a second sealing ring and a sealing cover installed at the connection between the fork ear and the anchor cup; one end of the sealing cover is located on the outer ring of the fork ear and is provided with an annular groove for installing the first sealing ring, and the other end is located on the outer ring of the anchor cup and is provided with an annular groove for installing the second sealing ring. The first sealing ring and the second sealing ring are respectively interference fit with the outer ring of the fork ear and the outer ring of the anchor cup.

4. A pin-jointed sling according to claim 3, characterized in that: The sealing cover is a Haversian structure.

5. A pin-connected sling according to claim 3, characterized in that: An annular step is arranged on the outer wall of the fork ear, and one end of the sealing cover is mounted on the annular step.

6. A pin-jointed sling according to claim 1, characterized in that: The side wall of the groove is a thin-wall structure.

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