Steel rail cementing insulation joint

Abstract

The utility model discloses a steel rail cementing insulation joint which comprises a joint body, the joint body comprises a steel rail, a first clamping plate, a second clamping plate and insulation groove plates, the first clamping plate and the second clamping plate are arranged on the two sides of the steel rail respectively, and the insulation groove plates are arranged between the first clamping plate and the steel rail and between the second clamping plate and the steel rail. The steel rail cementing insulation joint further comprises a plurality of groups of fasteners, and each group of fasteners comprises a connecting bolt and a locking nut which are matched with each other. The connecting bolts penetrate through the bolt holes from the first clamping plate and then extend out of the second clamping plate. The locking nut is in threaded connection with the outwards-extending end of the connecting bolt, the connecting bolt is tensioned in the axial direction in the screwing process, then the end of the connecting bolt and the locking nut elastically abut against the first clamping plate and the second clamping plate correspondingly, and the two ends of the bolt hole are sealed. According to the insulating joint, external water vapor is effectively prevented from permeating from a gap of the bolt hole of the cementing insulating joint, the problem of corrosion caused by the water vapor in the bolt hole is solved, and electric conduction of the insulating joint and line safety accidents caused by the electric conduction of the insulating joint are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of railway transportation, in particular to a rail adhesively-jointed insulating joint. Background Art

[0002] Rail insulation joints are one of the key structures that connect track circuits with seamless lines. The insulation joints of cross-section seamless lines and seamless turnouts must be glued insulation joints. With the rapid development of cross-section seamless lines and track circuits, higher requirements are placed on the insulation performance of insulation joints.

[0003] The factory standard for rail-bonded insulated joints proposed by TB / T2975 is that the resistance between rail and clamp, rail and rail should be greater than 10MΩ in dry state, and the resistance between rail and clamp, rail and rail should be greater than 1000Ω in wet state. In fact, users have put forward different requirements. For example, the users of the Guangzhou-Zhuhai Intercity Zhuhai Station require the resistance between rail and clamp to be greater than 10KΩ (dry state), and other users have different requirements such as the resistance between rail and clamp to be greater than 1000Ω, 100Ω, 20Ω, etc.

[0004] The existing products of adhesive insulation joints are generally assembled and glued by rails, plywood, insulating adhesive layer and bolt fasteners according to certain process requirements. The fasteners used in the existing rail adhesive insulation joints are all metal parts, and the washers are all ordinary flat washers. One flat washer is used on both sides of the nut and nut. There are inevitably gaps between the bolts and nuts, the bolts and flat washers, the flat washers and nuts, and the flat washers and plywood.

[0005] The existing patent "Rail Glued Insulated Joint (CN109355980A)" mentions a rail insulating joint, which provides a polyurethane elastic material sealing sleeve structure on both sides of the sleeve in the bolt hole to prevent water vapor from entering.

[0006] The existing patent "A Rail Glued Insulated Joint (CN113897819A)" mentions a rail insulating joint. The technology designs a gasket with a drainage groove to help discharge water vapor in the bolt hole.

[0007] The disadvantages of the prior art are as follows:

[0008] Most of the existing rail glued insulated joints are used in the open air. After long-term use, rainwater will penetrate into the gaps between the bolts and nuts, bolts and flat washers, flat washers and nuts, and flat washers and splints into the gaps in the bolt holes. A lot of water is retained in the gaps in the bolt holes. Metal parts such as rails and splints will rust under the influence of multiple factors such as water vapor and temperature. Rusty materials remain in the bolt holes, which will have a great impact on the insulation performance of the joints and may cause electrical connection, affecting line safety.

[0009] The existing patent "Rail Glued Insulated Joint (CN109355980A)" sets a polyurethane elastic material sealing sleeve structure on both sides of the sleeve in the bolt hole, which can prevent water vapor from entering the bolt hole. The disadvantage is that the polyurethane elastic material sealing sleeve needs to be slightly larger than the bolt hole to ensure sealing during extrusion. When the polyurethane elastic material sealing sleeve is larger than the bolt hole diameter, it is difficult to install.

[0010] The existing patent "A Rail Glued Insulated Joint (CN113897819A)" mentions a rail insulating joint. Although the technology is designed with a drainage groove, it does not completely solve the problem of water ingress at the bolts. In an environment with high humidity or an environment where the entire joint is soaked in water, the water vapor in the bolt hole cannot be eliminated, and there is still the possibility of rust in the bolt hole, which in turn affects the insulation performance of the joint. Utility Model Content

[0011] The utility model provides a rail adhesive insulating joint to solve the technical problems of difficult installation and poor insulation performance of the existing insulating joints.

[0012] The technical solution adopted by the utility model is as follows:

[0013] A rail glued insulating joint comprises a joint body, the joint body comprises a rail, a first clamping plate and a second clamping plate respectively arranged on both sides of the rail, an insulating slot plate arranged between the first clamping plate and the rail and between the second clamping plate and the rail, the joint body is also provided with bolt holes arranged in sequence along its length direction and vertically passing through both sides thereof, the rail glued insulating joint also comprises a plurality of groups of fasteners which are penetrated in each bolt hole to relatively tighten and fix the first clamping plate and the second clamping plate, each group of fasteners comprises: a connecting bolt and a locking nut which act in cooperation with each other; the connecting bolt extends out of the second clamping plate after passing through the bolt hole arranged on the first clamping plate side; the locking nut is threadedly connected to the protruding end of the connecting bolt extending out of the second clamping plate, and the connecting bolt is tightened axially during the tightening process, so that the end of the connecting bolt and the locking nut elastically press against the first clamping plate and the second clamping plate on the corresponding side respectively to seal the two ends of the bolt hole.

[0014] Furthermore, the connecting bolt includes a screw with an external thread on the outer circle of the end, and a bolt head fixedly connected to the other end of the screw; the screw extends out of the second clamping plate after passing through a bolt hole on the first clamping plate side, and the locking nut is threadedly connected to the protruding end of the screw extending out of the second clamping plate; the bolt head is used to elastically press the first clamping plate during the tightening process of the locking nut to seal the gap between it and the first clamping plate, thereby sealing the first end of the bolt hole.

[0015] Furthermore, the bolt head includes a first limiting nut connected to the end of the screw and integrally formed with the screw, and a sealing gasket sleeved on the outer circle of the screw; the sealing gasket is located between the first limiting nut and the first clamping plate, so as to be deformed and pressed between the first limiting nut and the first clamping plate under the action of the screw to seal the first end of the bolt hole.

[0016] Furthermore, the sealing gasket includes a first elastic ring and a steel washer that are coaxial, sleeved and connected into a whole; the first elastic ring is thicker in the axial direction than the steel washer, so that it can be deformed under the pressure of the first limiting nut to seal the gap between the first limiting nut and the first clamping plate; the steel washer is used to form a skeleton of the sealing gasket to bear the pressure and ensure that the torque of the locking nut meets the set requirements.

[0017] Further, the first elastic ring is located inside the steel washer; or, the first elastic ring is located outside the steel washer.

[0018] Furthermore, the bolt head includes a second limiting nut connected to the end of the screw and integrally formed with the screw, a first flat washer fixed to the second limiting nut near the inner end of the screw, and a first sealing ring installed on the inner end of the first flat washer; the first sealing ring is used to deform and press the first clamping plate under the action of the screw to seal the gap between the first flat washer and the first clamping plate to seal the first end of the bolt hole.

[0019] Furthermore, the locking nut includes a second flat washer, a first locking nut and a sealing nut which are sequentially installed on the protruding end of the screw; the second flat washer is located between the first locking nut and the second clamping plate, and the first locking nut is threadedly connected to the protruding end of the screw for axially tightening and locking the connecting bolt during the tightening process; the sealing nut cover is arranged outside the second flat washer and the first locking nut, and is sealingly threadedly connected to the protruding end of the screw, and the sealing nut is also used for deforming its open end during the tightening process to press against the second clamping plate to seal the gap between it and the second clamping plate, thereby sealing the second end of the bolt hole.

[0020] Furthermore, the sealing nut includes a nut body covered outside the second flat washer and the first locking nut, a second sealing ring that performs a sealing function, and a second elastic ring connected to the open end of the nut body; the nut body is threadedly connected to the outer circle of the protruding end of the screw rod, and the second sealing ring is located between the nut body and the screw rod; the second elastic ring is used to deform and press against the second clamping plate during the tightening process of the nut body, thereby sealing the gap between the sealing nut and the second clamping plate.

[0021] Furthermore, the nut body, the first locking nut and the second flat washer are integrally formed.

[0022] Furthermore, the locking nut includes a second locking nut threadedly connected to the protruding end of the screw, a third flat washer fixedly connected to the second locking nut on the inner end of the second clamping plate, a third sealing ring installed in the inner circle of the second locking nut, and a fourth sealing ring installed on the inner end of the third flat washer; the third sealing ring is used to seal the gap between the second locking nut and the screw; the fourth sealing ring is used to deform and press against the second clamping plate during the tightening process of the second locking nut, thereby sealing the gap between the second locking nut and the second clamping plate.

[0023] The utility model has the following beneficial effects:

[0024] In the rail glued insulating joint of the utility model, the connecting bolt is tightened axially by tightening the locking nut, and then the first clamping plate and the second clamping plate are relatively clamped and locked by the end of the connecting bolt and the locking nut which are relatively arranged, so that the joint body forms an integral structure with stable structure and simple installation operation; in the rail glued insulating joint of the utility model, the end of the connecting bolt is deformed and elastically pressed against the outer side of the first clamping plate under the action of the locking nut, and then the gap between the end of the connecting bolt and the first clamping plate is sealed to seal the first end of the bolt hole, and at the same time, the locking nut is also deformed and elastically pressed against the outer side of the second clamping plate, and then the gap between the locking nut and the second clamping plate is sealed to seal the second side end of the bolt hole, thereby realizing the sealing of the bolt hole, effectively isolating external water vapor from penetrating from the gap of the bolt hole of the glued insulating joint, eliminating the rust problem caused by water vapor in the bolt hole, reducing the conduction of the insulating joint and the line safety accidents caused by it, and improving the insulation performance of the insulating joint.

[0025] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0027] Figure 1 This is a schematic diagram of the top view of the structure of the rail adhesive insulation joint of the preferred embodiment of the utility model;

[0028] Figure 2 yes Figure 1 Schematic diagram of the cross-section structure;

[0029] Figure 3 yes Figure 2 A schematic diagram of the main structure of the middle sealing gasket;

[0030] Figure 4 yes Figure 3 A schematic diagram of the top view of the structure of the middle sealing gasket;

[0031] Figure 5 yes Figure 2 A schematic diagram of a half-section structure of a first embodiment of a middle locking nut;

[0032] Figure 6 yes Figure 2 A schematic diagram of the half-section structure of the second embodiment of the middle locking nut;

[0033] Figure 7 yes Figure 2 A schematic diagram of the half-section structure of the second embodiment of the connecting bolt.

[0034] Legend:

[0035] 10. Joint body; 101. Bolt hole; 11. Rail; 12. First clamping plate; 13. Second clamping plate; 14. Insulating slot plate; 15. Insulating sleeve; 20. Connecting bolt; 21. Screw; 22. Bolt head; 221. First limiting nut; 222. Sealing washer; 2221. First elastic ring; 2222. Steel washer; 223. Second limiting nut; 224. First flat washer; 225. First sealing ring; 30. Locking nut; 31. Second flat washer; 32. First locking nut; 33. Sealing nut; 331. Nut body; 332. Second sealing ring; 333. Second elastic ring; 34. Second locking nut; 35. Third flat washer; 36. Third sealing ring; 37. Fourth sealing ring. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. However, the present invention can be implemented in a variety of different ways as defined and covered below.

[0037] Reference Figure 1-2The preferred embodiment of the utility model provides a rail adhesive insulation joint, including a joint body 10, the joint body 10 includes a rail 11, a first clamping plate 12 and a second clamping plate 13 respectively arranged on both sides of the rail 11, and an insulation slot plate 14 arranged between the first clamping plate 12 and the rail 11 and between the second clamping plate 13 and the rail 11. The joint body 10 is also provided with bolt holes 101 arranged in sequence along its length direction and vertically passing through both sides thereof. The rail adhesive insulation joint also includes a plurality of groups of fasteners penetrated in each bolt hole 101 to relatively tighten and fix the first clamping plate 12 and the second clamping plate 13, and each group of fasteners includes: a connecting bolt 20 and a locking nut 30 acting in cooperation. The connecting bolt 20 penetrates the bolt hole 101 on the side of the first clamping plate 12 and extends out of the second clamping plate 13. The locking nut 30 is threadedly connected to the protruding end of the connecting bolt 20 extending out of the second clamping plate 13, and the connecting bolt 20 is axially tightened during the tightening process, so that the end of the connecting bolt 20 and the locking nut 30 elastically press against the first clamping plate 12 and the second clamping plate 13 on the corresponding side respectively to seal the two ends of the bolt hole 101.

[0038] In the rail glued insulating joint of the utility model, the connecting bolt 20 is tightened axially by tightening the locking nut 30, and then the first clamping plate 12 and the second clamping plate 13 are relatively clamped and locked by the end of the connecting bolt 20 and the locking nut 30 arranged relatively, so that the joint body 10 forms a structurally stable overall structure, and the installation operation is simple; in the rail glued insulating joint of the utility model, the end of the connecting bolt 20 is deformed and elastically pressed against the outer side of the first clamping plate 12 under the action of the locking nut 30, thereby sealing the end of the connecting bolt 20 The gap between the locking nut 30 and the first clamping plate 12 is formed to seal the first end of the bolt hole 101. At the same time, the locking nut 30 is also deformed and elastically pressed against the outer side of the second clamping plate 13, thereby sealing the gap between the locking nut 30 and the second clamping plate 13 to seal the second side end of the bolt hole 101, thereby achieving the sealing of the bolt hole 101, effectively isolating external water vapor from penetrating from the gap of the bolt hole 101 of the adhesively bonded insulating joint, eliminating the rust problem caused by water vapor in the bolt hole 101, reducing the conductivity of the insulating joint and the line safety accidents caused by it, and improving the insulation performance of the insulating joint.

[0039] Alternatively, if Figure 2 As shown, the joint body 10 further includes an insulating sleeve 15 axially installed in the bolt hole 101 , and the connecting bolt 20 is passed through the insulating sleeve 15 to insulate the rail 11 and the first clamping plate 12 and the second clamping plate 13 through the insulating sleeve 15 .

[0040] Alternatively, if Figure 2As shown, the connecting bolt 20 includes a screw rod 21 with an external thread on the outer circle of the end, and a bolt head 22 fixedly connected to the other end of the screw rod 21. The screw rod 21 passes through the bolt hole 101 on the side of the first clamping plate 12 and then extends out of the second clamping plate 13, and the locking nut 30 is threadedly connected to the extended end of the screw rod 21 extending out of the second clamping plate 13. The bolt head 22 is used to elastically press the first clamping plate 12 during the tightening process of the locking nut 30 to seal the gap between it and the first clamping plate 12, thereby sealing the first end of the bolt hole 101, and preventing external moisture from entering the first end of the bolt hole 101 through the gap between the bolt head 22 and the first clamping plate 12.

[0041] In this optional solution, the first embodiment of the bolt head 22 is as follows Figure 2 As shown, the bolt head 22 includes a first limiting nut 221 connected to the end of the screw rod 21 and formed integrally with the screw rod 21, and a sealing washer 222 sleeved on the outer circle of the screw rod 21. The sealing washer 222 is located between the first limiting nut 221 and the first clamping plate 12, so as to be deformed and pressed between the first limiting nut 221 and the first clamping plate 12 under the action of the screw rod 21 to seal the first end of the bolt hole 101.

[0042] Furthermore, if Figure 3 and Figure 4 As shown, the sealing gasket 222 includes a first elastic ring 2221 and a steel washer 2222 which are coaxial, sleeved and connected as a whole; in this optional solution, the steel washer 2222 is a steel ring made of a rigid material. The thickness of the first elastic ring 2221 along the axial direction is greater than that of the steel washer 2222, so as to be deformed under the compression of the first limiting nut 221 to seal the gap between the first limiting nut 221 and the first clamping plate 12. The steel washer 2222 is used to form a skeleton of the sealing gasket 222 to bear the pressure and ensure that the torque of the locking nut 30 reaches the set requirements. When the locking nut 30 is tightened, the steel ring bears the pressure to ensure that the torque can reach the set requirements, and the first elastic ring 2221 is compressed to be as thick as the steel ring. The first elastic ring 2221 seals the gap between the first limiting nut 221 with a large hexagon and the first clamping plate 12 in the compressed state, thereby sealing the first end of the bolt hole 101.

[0043] In the specific embodiment of this optional solution, the first elastic ring 2221 is located inside the steel washer 2222. Alternatively, the first elastic ring 2221 is located outside the steel washer 2222. Figure 4 shown.

[0044] In this optional solution, the second embodiment of the bolt head 22 is as follows Figure 7As shown, the bolt head 22 includes a second limiting nut 223 connected to the end of the screw rod 21 and integrally formed with the screw rod 21, a first flat washer 224 fixed to the inner side end of the second limiting nut 223 near the screw rod 21, and a first sealing ring 225 installed on the inner side end of the first flat washer 224. The first sealing ring 225 is used to deform and press the first clamping plate 12 under the action of the screw rod 21 to seal the gap between the first flat washer 224 and the first clamping plate 12 to seal the first end of the bolt hole 101. In this optional solution, the first flat washer 224 is a steel ring made of rigid material; when the locking nut 30 is tightened, the first flat washer 224 bears the pressure to ensure that the torque can reach the set requirements, and the first sealing ring 225 seals the gap between the large hexagonal second limiting nut 223 and the first clamping plate 12 in the compressed state, thereby sealing the first end of the bolt hole 101.

[0045] Optionally, the first embodiment of the locking nut 30, such as Figure 2 As shown, the locking nut 30 includes a second flat washer 31, a first locking nut 32 and a sealing nut 33 which are sequentially mounted on the protruding end of the screw rod 21. The second flat washer 31 is located between the first locking nut 32 and the second clamping plate 13. The first locking nut 32 is threadedly connected to the protruding end of the screw rod 21, so as to be used for axially tightening and locking the connecting bolt 20 during the tightening process. The sealing nut 33 is covered outside the second flat washer 31 and the first locking nut 32, and is threadedly connected to the protruding end of the screw rod 21. The sealing nut 33 is also used for deforming its open end to press against the second clamping plate 13 during the tightening process, so as to seal the gap between it and the second clamping plate 13, thereby sealing the second end of the bolt hole 101. In this optional solution, after the sealing nut 33 is tightened, the sealing nut 33 is threadedly connected to the extending end of the screw rod 21, so that the gap between the sealing nut 33 and the screw rod 21 can be sealed. At the same time, the open end of the sealing nut 33 is deformed to press against the second clamping plate 13, thereby sealing the gap between the sealing nut 33 and the second clamping plate 13, and then sealing the second end of the bolt hole 101.

[0046] In this option, if Figure 5As shown, the sealing nut 33 includes a nut body 331 covered outside the second flat washer 31 and the first locking nut 32, a second sealing ring 332 for sealing, and a second elastic ring 333 connected to the open end of the nut body 331. The nut body 331 is threadedly connected to the outer circle of the extended end of the screw rod 21, and the second sealing ring 332 is located between the nut body 331 and the screw rod 21. The second elastic ring 333 is used to deform and press against the second clamping plate 13 during the tightening process of the nut body 331, thereby sealing the gap between the sealing nut 33 and the second clamping plate 13. After the nut body 331 is tightened, the second sealing ring 332 is compressed to ensure that the thread of the large hexagonal first locking nut 32 is sealed. At the same time, the second flat washer 31 is compressed to ensure that the sealing nut 33 and the second clamping plate 13 are sealed, thereby ensuring that the periphery of the first locking nut 32 in the original design is sealed. The sealing nut 33 only has the sealing function and does not have the function of ensuring torque. The torque function is still guaranteed by the first locking nut 32.

[0047] Preferably, if Figure 2 As shown, the nut body 331, the first locking nut 32 and the second flat washer 31 are integrally formed. After the integral forming, the sealing nut 33 plays the function of ensuring torque and also plays the function of ensuring sealing.

[0048] Optionally, a second embodiment of the locking nut 30, such as Figure 6 As shown, the locking nut 30 includes a second locking nut 34 threadedly connected to the protruding end of the screw rod 21, a third flat washer 35 fixedly connected to the inner side end of the second locking nut 34 facing the second clamping plate 13, a third sealing ring 36 installed in the inner circle of the second locking nut 34, and a fourth sealing ring 37 installed on the inner side end of the third flat washer 35. The third sealing ring 36 is used to seal the gap between the second locking nut 34 and the screw rod 21. The fourth sealing ring 37 is used to deform and press the second clamping plate 13 during the tightening process of the second locking nut 34, thereby sealing the gap between the second locking nut 34 and the second clamping plate 13. After the second locking nut 34 is tightened, the third sealing ring 36 is compressed to seal the gap between the second locking nut 34 and the screw rod 21, and the fourth sealing ring 37 is compressed to ensure the sealing between the second locking nut 34 and the second clamping plate 13.

[0049] In the utility model, through the optimized design of the insulating joint, it can be ensured that the torque of the fastener system meets the design requirements, and at the same time, the sealing of the head and tail of the fastener system can be ensured, thereby preventing the entry of water vapor and thus ensuring the electrical insulation performance of the rail adhesive insulating joint.

[0050] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A rail adhesive insulating joint, comprising a joint body (10), the joint body (10) comprising a rail (11), a first clamping plate (12) and a second clamping plate (13) respectively arranged on both sides of the rail (11), and an insulating slot plate (14) arranged between the first clamping plate (12) and the rail (11) and between the second clamping plate (13) and the rail (11), the joint body (10) is also provided with bolt holes (101) arranged in sequence along the length direction thereof and vertically penetrating through both sides thereof, characterized in that: The rail adhesive insulation joint also includes a plurality of groups of fasteners which are inserted into the bolt holes (101) to relatively tighten and fix the first clamping plate (12) and the second clamping plate (13), and each group of fasteners includes: Cooperative connecting bolts (20) and locking nuts (30); The connecting bolt (20) passes through a bolt hole (101) provided on the side of the first clamping plate (12) and then extends out of the second clamping plate (13); The locking nut (30) is threadedly connected to the protruding end of the connecting bolt (20) extending out of the second clamping plate (13), and the connecting bolt (20) is axially tightened during the tightening process, so that the end of the connecting bolt (20) and the locking nut (30) elastically press against the first clamping plate (12) and the second clamping plate (13) on the corresponding side respectively to seal the two ends of the bolt hole (101).

2. The rail adhesive insulating joint according to claim 1, characterized in that: The connecting bolt (20) comprises a screw rod (21) with an outer circle at the end thereof having an external thread, and a bolt head (22) fixedly connected to the other end of the screw rod (21); The screw rod (21) passes through a bolt hole (101) on the side of the first clamping plate (12) and then extends out of the second clamping plate (13), and the locking nut (30) is threadedly connected to the protruding end of the screw rod (21) extending out of the second clamping plate (13); The bolt head (22) is used to elastically press the first clamping plate (12) during the tightening process of the locking nut (30) to seal the gap between it and the first clamping plate (12), thereby sealing the first end of the bolt hole (101).

3. The rail adhesive insulating joint according to claim 2, characterized in that: The bolt head (22) comprises a first limiting nut (221) connected to the end of the screw rod (21) and formed integrally with the screw rod (21), and a sealing gasket (222) sleeved on the outer circle of the screw rod (21); The sealing gasket (222) is located between the first limiting nut (221) and the first clamping plate (12) so as to be deformed and pressed between the first limiting nut (221) and the first clamping plate (12) under the action of the screw rod (21) to seal the first end of the bolt hole (101).

4. The rail adhesive insulating joint according to claim 3, characterized in that: The sealing gasket (222) comprises a first elastic ring (2221) and a steel gasket (2222) which are coaxially arranged and sleeved and connected to form a whole. The first elastic ring (2221) has a thickness in the axial direction greater than that of the steel washer (2222), so as to be deformed under the compression of the first limiting nut (221) to seal the gap between the first limiting nut (221) and the first clamping plate (12); The steel washer (2222) is used to form the skeleton of the sealing washer (222) to bear the pressure and ensure that the torque of the locking nut (30) reaches the set requirement.

5. The rail adhesive insulating joint according to claim 4, characterized in that: The first elastic ring (2221) is located inside the steel washer (2222); or The first elastic ring (2221) is located outside the steel washer (2222).

6. The rail adhesive insulating joint according to claim 2, characterized in that: The bolt head (22) comprises a second limiting nut (223) connected to the end of the screw rod (21) and formed integrally with the screw rod (21), a first flat washer (224) fixed to the inner end of the second limiting nut (223) close to the screw rod (21), and a first sealing ring (225) mounted on the inner end of the first flat washer (224); The first sealing ring (225) is used to deform and press the first clamping plate (12) under the action of the screw rod (21) to seal the gap between the first flat washer (224) and the first clamping plate (12) to seal the first end of the bolt hole (101).

7. The rail adhesive insulating joint according to claim 2, characterized in that: The locking nut (30) comprises a second flat washer (31), a first locking nut (32) and a sealing nut (33) which are sequentially mounted on the protruding end of the screw rod (21); The second flat washer (31) is located between the first locking nut (32) and the second clamping plate (13), and the first locking nut (32) is threadedly connected to the extended end of the screw rod (21) so as to tighten and lock the connecting bolt (20) in the axial direction during the tightening process; The sealing nut (33) is arranged outside the second flat washer (31) and the first locking nut (32), and is sealingly threadedly connected to the protruding end of the screw rod (21). The sealing nut (33) is also used to deform its open end to press against the second clamping plate (13) during the tightening process to seal the gap between it and the second clamping plate (13), thereby sealing the second end of the bolt hole (101).

8. The rail adhesive insulating joint according to claim 7, characterized in that: The sealing nut (33) comprises a nut body (331) which is covered on the outside of the second flat washer (31) and the first locking nut (32), a second sealing ring (332) which performs a sealing function, and a second elastic ring (333) which is connected to the open end of the nut body (331); The nut body (331) is threadedly connected to the outer circle of the extended end of the screw rod (21), and the second sealing ring (332) is located between the nut body (331) and the screw rod (21); The second elastic ring (333) is used to deform and press against the second clamping plate (13) during the tightening process of the nut body (331), thereby sealing the gap between the sealing nut (33) and the second clamping plate (13).

9. The rail adhesive insulating joint according to claim 8, characterized in that: The nut body (331), the first locking nut (32) and the second flat washer (31) are integrally formed.

10. The rail adhesive insulating joint according to claim 2, characterized in that: The locking nut (30) comprises a second locking nut (34) threadedly connected to the protruding end of the screw rod (21), a third flat washer (35) fixedly connected to the inner side end of the second locking nut (34) facing the second clamping plate (13), and a second locking nut (34) threadedly connected to the outer side end of the screw rod (21), and a third flat washer (35) fixedly connected to the inner side end of the second locking nut (34) facing the second clamping plate (13). A third sealing ring (36) in the inner circle of the locking nut (34) and a fourth sealing ring (37) mounted on the inner side end of the third flat washer (35); The third sealing ring (36) is used to seal the gap between the second locking nut (34) and the screw rod (21); The fourth sealing ring (37) is used to deform and press against the second clamping plate (13) during the tightening process of the second locking nut (34), thereby sealing the gap between the second locking nut (34) and the second clamping plate (13).

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