Pull rod type expansion joint

Abstract

The utility model relates to a pull rod type expansion joint which comprises a pull rod and pull plates, the two ends of the pull rod are both connected with the pull plates, the pull plates are provided with first holes, the pull rod is movably matched with the pull plates through the first holes, and gasket assemblies are arranged at the joints of the pull rod and the pull plates. The gasket assemblies composed of the first gaskets and the second gaskets are arranged on the two sides of the pulling plate, so that the rotating centers of the gasket assemblies are controlled at the center of the first hole of the pulling plate. When the locking pieces on the two sides of the pulling plate are screwed, the pulling rod, the locking pieces and the second gasket can rotate around the rotating circle center of the first gasket at the same time in the using process. The problem that an inner side locking piece needs to be loosened for the field pull rod under the negative pressure working condition is solved, and it is ensured that the pull rod can balance pressure thrust all the time.

Description

Technical Field

[0001] The utility model relates to the technical field of expansion joint devices, in particular to a pull rod type expansion joint. Background Art

[0002] As a key component of pipeline compensation or mechanical sealing technology, tie-rod expansion joints, through their unique design and structure, effectively compensate for axial or lateral deformation caused by thermal expansion and contraction of pipes or containers due to temperature fluctuations, ensuring the proper operation of the system. As a key component of the expansion joint, the tie-rod provides both fastening and support. When the pipe or container expands and contracts, the bellows deform accordingly. The tie-rod's tightening action balances the forces applied to the bellows, thereby ensuring the mechanical performance and sealing properties of the expansion joint. Furthermore, the tie-rod adjusts the pre-deflection of the bellows, maintaining elastic deformation within a certain range to accommodate varying operating conditions.

[0003] However, in negative pressure conditions, tie-rod expansion joints incorporate ball, conical washers, and nuts on the back of the tie plate to prevent vacuum forces from compressing the bellows. Consequently, the rotational centers of the spherical washers on either side of the tie plate are not concentric, and the spherical and conical washers on the back must maintain some clearance from the tie plate to allow the tie rod to rotate. Therefore, after on-site installation of the expansion joint, the nuts on the inside of the tie plate should be loosened slightly to ensure proper function of the tie rod. However, this operation will generate internal pressure thrust until the tie plate fully supports the ball, conical washers, and nuts on the back during operation. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a tie rod type expansion joint to solve one or more problems in the prior art.

[0005] To achieve the above purpose, the technical solution of the utility model is as follows:

[0006] A pull rod type expansion joint includes a pull rod and a pull plate, wherein both ends of the pull rod are connected to the pull plate, the pull plate has a first hole, the pull rod can be movably matched with the pull plate through the first hole, and a washer assembly is provided at the intersection of the pull rod and the pull plate.

[0007] Furthermore, the washer assembly includes a first washer, which is evenly connected to the pull plate relative to the first hole and is symmetrically arranged on both sides of the pull plate.

[0008] Furthermore, the first washer is provided with a first surface on a side away from the pull plate.

[0009] Furthermore, the washer assembly also includes a second washer, and the second washer is provided with a second surface on a surface close to the pull plate.

[0010] Further, the second surface is movably fitted to the first surface.

[0011] Further, the expansion joint further includes a locking member, and the locking member is movably arranged on the tie rod.

[0012] Further, the locking member is located on both sides of the pull plate and abuts against one surface of the second washer away from the pull plate.

[0013] Further, the washer assembly is concentric with the first hole.

[0014] Compared with the prior art, the beneficial technical effects of the present utility model are as follows:

[0015] By arranging a washer assembly composed of a first washer and a second washer on both sides of the pull plate, the rotation center of the washer assembly is controlled at the center of the first hole of the pull plate. When the locking members on both sides of the pull plate are tightened, during use, the tie rod, the locking member, and the second washer can rotate around the rotation center of the first washer at the same time. This avoids the problem that the inner locking member of the on-site tie rod needs to be loosened under the negative pressure condition, and ensures that the tie rod can always balance the pressure thrust. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Shows a schematic structure of a tie rod type expansion joint according to an embodiment of the present utility model Figure I .

[0017] Figure 2 Shows a schematic structure of a tie rod type expansion joint according to an embodiment of the present utility model Figure II .

[0018] Reference numerals in the drawings: 1, tie rod; 2, pull plate; 201, first hole; 3, washer assembly; 301, first washer; 3011, first surface; 302, second washer; 3021, second surface; 4, locking member. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In order to make the purpose, technical solutions and advantages of the present utility model clearer and more understandable, the following further details a pull rod type expansion joint proposed by the present utility model in combination with the attached drawings and specific embodiments. According to the following description, the advantages and features of the present utility model will be clearer. It should be noted that the attached drawings are in a very simplified form and all use non-precise scales. The orientation or positional relationship indicated by terms such as "center", "lateral", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "side", etc. is based on the orientation or positional relationship shown in the attached drawings, rather than indicating or implying that a pull rod type expansion joint or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present utility model, and is only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present utility model. In order to make the purpose, features and advantages of the present utility model more obvious and understandable, please refer to the attached drawings.

[0020] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present utility model. Therefore, they do not have technical substance significance. Any modification of the structure, change in the ratio relationship or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed by the present utility model.

[0021] The following describes the specific structure of a pull rod type expansion joint:

[0022] Please refer to Figure 1 and Figure 2 , the pull rod type expansion joint of this embodiment includes a pull rod 1 and a pull plate 2. Both ends of the pull rod 1 are connected with the pull plate 2. The pull plate 2 is provided with a first hole 201. The pull rod 1 is movably fitted to the pull plate 2 through the first hole 201. A washer assembly 3 is provided at the junction of the pull rod 1 and the pull plate 2, and the washer assembly 3 is concentric with the first hole 201.

[0023] Furthermore, the washer assembly 3 includes a first washer 301. The first washer 301 is evenly connected to the pull plate 2 relative to the first hole 201 and is symmetrically arranged on both sides of the pull plate 2. The first washer 301 has a first surface 3011 on the side away from the pull plate 2.

[0024] Furthermore, the washer assembly 3 further includes a second washer 302. The second washer 302 has a second surface 3021 on the side close to the pull plate 2. The second surface 3021 is movably fitted to the first surface 3011.

[0025] Further, the expansion joint further includes a locking member 4, which is movably arranged on the tie rod 1. Preferably, the locking member 4 is a nut in this embodiment. The locking member 4 is located on both sides of the pull plate 2 and abuts against the side of the second washer 302 away from the pull plate 2, so that the washer assembly 3 is fastened relative to the pull plate 2 through the locking member 4. When adjusting after tightening the locking members 4 on both sides of the pull plate 2, the tie rod 1, the locking member 4 and the second washer 302 can rotate around the rotation center of the first washer 301 simultaneously.

[0026] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification. The above-described embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A pull rod type expansion joint, comprising a pull rod and a pull plate. Both ends of the pull rod are connected with the pull plate. The pull plate is provided with a first hole, and the pull rod is movably fitted to the pull plate through the first hole. It is characterized in that: A washer assembly is provided at the junction of the pull rod and the pull plate.

2. The expansion joint of the pull rod type according to claim 1, characterized in that: The washer assembly includes a first washer, which is evenly connected to the pull plate relative to the first hole and symmetrically arranged on both sides of the pull plate.

3. The expansion joint of the drawbar type according to claim 2, characterized in that: The first washer has a first surface on the side away from the pull plate.

4. The expansion joint of a drawbar type according to claim 3, characterized in that: The washer assembly further includes a second washer, which has a second surface on the side close to the pull plate.

5. The expansion joint of the drawbar type according to claim 4, characterized in that: The second surface is movably engaged with the first surface.

6. The expansion joint of the pull rod type according to claim 5, characterized in that: The expansion joint further includes a locking member, which is movably arranged on the pull rod.

7. The expansion joint of the pull rod type according to claim 6, characterized in that: The locking member is located on both sides of the pull plate and abuts against the side of the second washer away from the pull plate.

8. The expansion joint of the pull rod type according to claim 7, wherein: The washer assembly is concentric with the first hole.

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