CN210460009U - Steel pull rod - Google Patents

Abstract

The utility model provides a steel pull rod, which comprises a rod body (2), one end of which is used for realizing the connection or fixation of the steel pull rod and a fixture to be connected; the sleeve (1) is connected to the other end of the rod body (2), and the thickness of the inner wall of the sleeve (1) is gradually thickened from a preset position along the direction from the opening inlet to the bottom of the opening. The utility model discloses a steel pull rod carries out the processing of inner wall thickening gradually in sleeve (1) inboard for this sleeve (1) is used for the obvious grow of the biggest tensile stress that fixed wire rope's part can bear, and this design still makes this very important structure that is used for fixed wire rope fag end hide inside the sleeve simultaneously, has avoided the corruption of external environment to this important structure.

Description

Steel pull rod

Technical Field

The utility model relates to a wire rope connecting elements technical field, concretely relates to steel pull rod for wire rope fixed connection.

Background

The steel pull rod is a common tool in the construction of a high-altitude overhanging steel structure. The steel pull rod can play a role in pre-tightening and stretching, and the conventional steel pull rod is mainly a tension member assembled by steel rod bodies, connecting pieces and other components. The steel pull rod connection fitting except the rod body comprises: the device comprises a joint, a pin shaft, an end cover, a long sheath, a short sheath, a thin nut, a base plate and the like.

During the production and development process related to the technology for many years, the applicant of the present application finds that the above-mentioned existing steel tie rod technology has at least the following technical problems:

in the traditional steel pull rod process shown in fig. 1, a stepped shaft type structural design is adopted on the outer wall of a sleeve, a hole in the sleeve is a smooth hole, the depth of the hole extends to the bottom of the sleeve towards the inside of the sleeve, a steel wire rope is inserted into the smooth hole of the sleeve during specific use, and the stepped shaft structure on the outer wall of the sleeve is pressed into a consistent size by a hydraulic clamp so as to fix the steel wire rope.

However, in this kind of stepped shaft type steel tie rod, the wall thickness of the stepped shaft portion is significantly lower than that of the peripheral sleeve portion, stress concentration is caused by abrupt change in section, and the stepped shaft portion is very easily damaged at the time of processing, and even if it is formed, the stepped shaft portion is difficult to withstand high tensile stress in industrial application of the steel tie rod, and is a portion which is very easily damaged. Meanwhile, the steel wire rope access part is exposed in the external environment outside the sleeve wall for a long time, so that the steel wire rope is easily damaged naturally due to external factors such as corrosion and abrasion, and the service life of the steel pull rod is seriously influenced.

The search of existing documents reveals:

the patent document with the publication number of CN205637123U is disclosed by the national intellectual property office, and the stepwise adjustable steel pull rod is characterized by comprising a steel pull rod (1), an adjusting section (2), a first connecting steel plate (3) and a second connecting steel plate (6), wherein the first connecting steel plate (3) is arranged at each of two ends of the steel pull rod (1), the adjusting section (2) is arranged between the outer end of one first connecting steel plate (3) and the second connecting steel plate (6), threaded steel rods (4) are arranged at two ends of the adjusting section (2) in a threaded mode, the threaded steel rods (4) are connected with the first connecting steel plate (3) and the second connecting steel plate (6) through pressure-bearing high-strength bolts (5), and the first connecting steel plate (3) and the second connecting steel plate (6) are connected with the outside through the pressure-bearing high-strength bolts (5).

This patent document, its specification 0005 paragraph mentions "all be provided with first connecting steel plate at the both ends of steel pull rod, the regulation section sets up between the outer end of one of them first connecting steel plate and the second connecting steel plate, the both ends of regulation section are provided with the screw-thread steel pole through the screw thread mode, the screw-thread steel pole adopts pressure-bearing formula high strength bolted connection with first connecting steel plate and second connecting steel plate, first connecting steel plate and second connecting steel plate all adopt pressure-bearing formula high strength bolted connection with the outside, it is adjustable through middle regulation section to know, guarantee the degree that the precision reaches the millimeter level through the screw thread, thereby confirm adjust length, reduce construction error. Obviously, the thread needs to bear not only the responsibility of bearing tension and pressure but also the responsibility of controlling precision to achieve the purpose of reducing construction errors, so the steel tie rod disclosed in the patent document has poor practical operability and does not make enough breakthrough in the direction of bearing higher tension and stress.

For another example, the patent document with publication number CN205907900U, which is published by the national intellectual property office as huge force rigging limited company, discloses an automatic aligning steel tie rod, which comprises a connector and a steel tie rod connected with the connector, and is characterized in that: the connector is internally provided with a spherical hole, the spherical hole is internally provided with a centripetal joint bearing assembly with an outer spherical surface, the center of the centripetal joint bearing assembly is provided with a pin shaft hole, and a pin shaft assembly is arranged in the pin shaft hole.

The patent document provides a self-aligning steel tie rod, which uses an embedded centripetal joint bearing assembly to eliminate additional stress in other directions in the structure, and aims at some situations that the angle adjustment is not determined due to frequent angle adjustment or the angle changes in the stress process. The self-aligning steel pull rod has the function of self-adjusting to deal with various additional stresses when dealing with external force factors such as vibration, wind load and the like, but the improvement of the maximum tensile stress is based on the design of using low-alloy structural steel, and enough improvement and contribution are not made in the direction of improving the bearable maximum tensile stress on the premise of not improving the material.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the applicant analyzes that the outer diameter wall thickness of the corresponding outer sleeve at the steel wire rope connecting position is too thin, so that the structure at the position is relatively fragile, and the maximum tensile stress which can be borne by the whole steel pull rod is insufficient.

Therefore, the utility model provides a steel pull rod, this steel pull rod can solve under the existing conditions hydraulic pressure fixed wire rope in-process, and the biggest tensile stress that telescopic wire rope access department part can bear is not enough, thereby the difficult problem of easy damage is leaded to the external environment of direct contact moreover.

The utility model discloses a steel pull rod, it is including: one end of the rod body (2) is used for realizing the connection or fixation of the steel pull rod and a fixture to be connected; the sleeve (1) is connected to the other end of the rod body (2), an opening is formed in one end, away from the rod body (2), of the sleeve (1), and the opening is used for being connected into a steel wire rope; the thickness of the inner wall of the sleeve (1) is gradually thicker from a preset position to the bottom of the opening along the direction from the opening inlet.

Further, the thickness of the inner wall of the sleeve (1) becomes thicker in a step-by-step mode along the direction from the opening inlet to the opening bottom.

Further, the thickness of the inner wall of the sleeve (1) becomes thicker continuously along the direction from the opening inlet to the opening bottom.

Further, the rod body (2) and the end of the to-be-connected fixture which is connected or fixed are a nut fixing end (3), and the surface of the nut fixing end (3) is provided with a thread for connecting a nut.

Furthermore, a tensioner is additionally arranged between the rod body (2) and a fixture to be connected with the rod body (2).

Further, the sleeve (1) and the rod body (2) are welded into an integral structure.

Further, the sleeve (1) and the rod body (2) are of an integrally formed structure.

Further, the steel pull rod is of a detachable structure.

Furthermore, two pairs of connecting buckles are arranged at the connecting part of the rod body (2) and the sleeve (1), and are respectively arranged on two sides of the rod body (2) and two sides of the sleeve (1); the connecting buckles are located on two sides of the rod body (2) and two sides of the sleeve (1) and are opposite in position, and the connecting buckles are used for connecting the rod body (2) and the sleeve (1).

The utility model discloses a steel pull rod compares in prior art's advantage lies in:

1) the initial utility model of steel pull rod provided by the utility model aims to solve the problem of insufficient maximum tensile stress that the steel wire rope can bear under the existing condition, and analyzes and recognizes that the wall thickness of the outer wall corresponding to the part for connecting the steel wire rope is too small, so that the adjustment is decided to be changed into a sleeve inner wall thickening type structure, but unexpectedly, the design ensures that in the processing process of fixing the steel wire rope by utilizing hydraulic equipment and an irregular mould to strongly press the sleeve in some occasions and processing flows, because the outer wall of the sleeve is not an uneven structure any more, but a structure with the same outer wall outer diameter, when some irregular moulds are used for hydraulic operation, the fixation and the proceeding of the hydraulic operation are easier, and the problems that the stepped shaft part is directly damaged due to uneven stress in the hydraulic process are also avoided, finally, compared with the original steel pull rod, the yield of the steel pull rod is obviously improved.

2) The steel pull rod of the utility model processes the gradual thickening of the inner wall at the inner side of the sleeve, so that the maximum tensile stress born by the part of the sleeve used for fixing the steel wire rope is obviously increased, and simultaneously, the very important structure used for fixing the rope head of the steel wire rope is hidden in the sleeve with the same outer diameter, thereby avoiding the corrosion of the external environment to the important structure;

3) the actual test meter for the maximum tensile stress of each type of structure is detailed in Table 1 (test meter for tensile and fracture resistance of different structures of BLG205 strength steel)

Attached: the remaining steel tie rods not marked in the first column in table 1 are all the qualified stainless steel tie rod products with the strength grade of BLG205 specified in GB T20934-.

Wherein the original tensile strength R_mA520 MPa steel tie is defined in GB T20934-2016 as the BLG205 strength rating.

As shown in Table 1, the novel steel pull rod sleeve of the utility model has the tensile strength R_mCompared with the traditional stepped shaft type steel pull rod sleeve, the steel pull rod sleeve has certain progress;

4) the existing steel pull rod is complex in design, a U-shaped joint and a rivet are adopted to be connected with a steel frame, the manufacturing cost is high, the installation and construction are very laborious, the inner wall of the steel pull rod which is gradually thickened becomes small, the steel pull rod is finally pressed through hydraulic equipment such as an oil press or a hydraulic press, a steel wire rope connected into a sleeve and the sleeve are integrally hydraulically formed, and the steel pull rod is suitable for an environment with high tensile stress which cannot be adapted to the steel pull rod with an internal hole formed through an external stepped shaft on the premise of low cost; due to the design that the inner wall of the steel pull rod is gradually reduced, the sudden change of the section of the existing stepped shaft type steel pull rod generated when the steel pull rod is subjected to hydraulic pressure is reduced, the stress concentration condition caused by the sudden change of the section in the hydraulic pressure process is weakened, and meanwhile, the fixing effect of the steel pull rod sleeve on the steel wire rope is obviously enhanced due to the gradually reduced inner wall, which is proved by the following two embodiments of the steel pull rod sleeve;

5) in the embodiment of the utility model in which the inner walls of the sleeves of the steel pull rod are gradually thickened, the inner wall of the sleeve is thickened from the outside to the inside, so the fixing effect of the steel wire rope is good after hydraulic pressure, but the tensile strength is high (R)_m501) is slightly lower than the other embodiment of the continuously thickened sleeve inner wall (Rm is 515), so in the practical application scene, when the steel wire rope needing to be fixed has the characteristics of low surface friction coefficient, small strand number and the like, the steel wire rope is not easy to be fixedWhen the steel wire rope is fixed or when the surface friction coefficient of the steel wire rope material needing to be fixed is higher and the number of strands is more, the embodiment that the inner walls of the plurality of sleeves 1 are gradually thickened can be selected according to the requirements; according to different scene selection the utility model discloses a different embodiments, it is visible the utility model discloses have multiple use's adaptability and alternative.

Drawings

FIG. 1 is a schematic three-dimensional structure of a steel tie rod of the prior art;

FIG. 2 is a front view of the prior art steel tie rod of FIG. 1;

FIG. 3 is a cross-sectional view at B-B of the prior art steel tie rod of FIG. 2;

fig. 4 is a schematic three-dimensional structure diagram of a steel pull rod according to a first embodiment of the present invention;

FIG. 5 is a front view of the steel drawbar of FIG. 4;

FIG. 6 is a cross-sectional view of the steel tie rod of FIG. 5 taken at A-A and gradually thickened on the inner wall of the sleeve;

fig. 7 is a cross-sectional view of a steel tie rod according to a second embodiment of the present invention, showing the inner wall of the sleeve being continuously thickened;

fig. 8 is a schematic view of the connection structure of all the embodiments of the present invention after using hydro-forming.

In the figure: 1. a sleeve; 2. a rod body; 3. a nut fixing end; 4. a wire rope; 1', a sleeve; 2', a rod body; 1', a sleeve; 1 "', sleeve.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

Throughout the description of the present invention, it should be noted that, for the terms of orientation, there are terms such as "center", "horizontal", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicating the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, which are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific scope of protection of the present invention.

Referring to fig. 1 to 3, fig. 1, 2 and 3 all show a conventional steel tie structure, in which a steel wire rope connection portion of the steel tie structure is designed to be an exposed shaft type with a stepwise reduction, so as to illustrate the disadvantages of the conventional process in terms of corrosion resistance, tensile stress, and the like. The prior art steel tie rod comprises a sleeve 1 'and a rod body 2'.

In fig. 1, the left side is a sleeve 1 'portion of a steel pull rod in the prior art, the rightmost end of the sleeve 1' is a portion for fixing a steel wire rope, the sleeve is designed into an exposed stepped shaft type structure, and the wall thickness of the outer wall corresponding to the stepped shaft portion is small, so that the stepped shaft type steel pull rod is easy to break due to high tensile stress in the actual use process, and adverse effects such as accidents are caused. In addition, the stepped shaft of the conventional stepped shaft type steel pull rod is directly exposed in the external environment, is easy to damage due to external corrosion, seriously influences the service life of the steel pull rod, and further influences the stability of the fixed connection between the steel pull rod and the steel wire rope.

Example 1:

referring to fig. 4, 5 and 6, the series of drawings is a series of schematic views of a steel tie rod according to a first embodiment of the present invention, which includes a sleeve 1 and a rod body 2, wherein the rod body 2 has a nut fixing end 3. Fig. 6 is a specific schematic view of the inner wall of the sleeve 1 of the present invention being a stepwise thickening from the opening entrance to the opening bottom, and illustrates the structural advantages of this embodiment of the present invention over the prior art.

In the figure, the part of the sleeve 1 close to the rod body 2 is a part of the plurality of sleeves 1 with gradually thickened inner walls, the inner wall of the sleeve 1 in the first embodiment is initially of uniform inner diameter from the opening entrance to the bottom, but when starting from a preset position (also referred to as an inner wall thickening starting position, namely a starting position where a steel wire rope head is inserted into the sleeve to be clamped and fixed), the inner wall starts to gradually thicken, and the thickened part is the key part of the steel pull rod for connecting the steel wire rope head so as to receive subsequent hydraulic pressure. And because in steel pull rod technical field, this kind of process of pressing the steel pull rod through hydraulic mould is at fixed wire rope's in-process, must drive the mould through the hydraulic press and press sleeve 1's outer wall, and the utility model discloses a steel pull rod's design for pressing the in-process, this outer wall part is not highly different, but external diameter thickness is unified, and the atress is even, has avoided hydraulic pressure force direct damage important sleeve 1's that is used for fixed wire rope's inner wall to thicken the part gradually in the course of working. In addition, the steel pull rod with the thickened inner wall is protected inside the opening of the sleeve at the important position connected to the rope end of the steel wire rope, in the actual use process, the part is in full contact with the steel wire rope, so that the steel pull rod is not easy to corrode by the external environment, and the outer side of the thin wall of the part of the stepped shaft in the prior art is easy to wear and corrode in the contact process of the external environment, so that the outer side of the wall of the part of the stepped shaft is damaged continuously, and the inner structure of the steel pull rod is damaged.

Example 2:

referring to fig. 7, fig. 7 is a cross-sectional view of a steel tie rod according to a second embodiment of the present invention, showing that the inner wall of the sleeve is continuously thickened; this figure differs from fig. 4 in that the thickening of the inner wall of the sleeve 1 "of the figure is not stepwise, but continuously variable, compared with the prior art, the design also has the functions of increasing the maximum tensile stress of the steel pull rod, avoiding the corrosion of the key fixing part and the like, and because the thickening of the inner wall of the sleeve 1' is continuous and smooth, the maximum tensile stress which can be borne by the sleeve is larger than that of the embodiment 1, but also because the thickening of the inner wall of the sleeve 1 "is not stepwise, after the cable has been fixed by hydroforming, the fixing effect for the steel wire rope is weaker than that of the embodiment 1, therefore, the embodiment 2 and the embodiment 1 should be selected according to the situation, the utility model provides a plurality of options, the steel pull rod has good selectivity in different occasions facing the number of strands, the friction coefficient and the required maximum tensile stress.

Referring to fig. 8, fig. 8 is a schematic view of a connection structure after all embodiments of the present invention are formed by hydraulic molding; for illustrating the situation after the steel tie rod of the present invention uses hydraulic pressure and a die to compress the sleeve 1 (or the sleeve 1 ') and fix the sleeve 1 (or the sleeve 1') and the wire rope. Fig. 1 to 7 mentioned above are schematic structural diagrams of the steel pull rod of the type before the steel pull rod is sleeved into a steel wire rope through an opening and hydraulically fixed, and fig. 8 is a schematic structural diagram of an appearance after pressing. When the steel wire rope is connected and fixed, the steps are as follows:

1) the steel wire rope needs to be pushed into the deep opening of the sleeve 1 until the steel wire rope is pushed to the gradually-thickened part of the inner wall of the sleeve 1 (or the sleeve 1');

2) the sleeve 1 (or sleeve 1') is then pressed strongly using hydraulic equipment and a die;

3) since a prismatic mold is usually used, it can be seen that the sleeve 1 is pressed into the shape of a prism in fig. 6, resulting in a pressed sleeve 1 "'. Since the outer diameters of the outer surfaces of the two embodiments of the sleeve 1 (or the sleeve 1') of the present invention are consistent, the local stress is not too high.

The hydraulic equipment and the die installed therein compress the sleeve together, and finally the sleeve 1 '″ is formed by pressing as shown in fig. 6, at this time, the fixing of the steel pull rod and the steel wire rope is completed, and the part of the volume extruded by the steel wire rope after being subjected to hydraulic pressure is also stored by the gradually thickened position (which is used as a steel wire rope allowance storage position in addition to the further fixing function) in the sleeve 1'. Thereby using the part of the rod body 2 to be connected with a fixture to be connected, and realizing the use of the steel pull rod.

Referring to fig. 4 to 7, all embodiments of the present invention may include a sleeve 1 (or a sleeve 1' in the second embodiment, hereinafter, referred to as the sleeve 1, but the following description applies to both embodiments, which is a general structural improvement of all embodiments of the present invention) and a rod 2, and preferably, a nut fixing end 3 may be provided.

The rod body 2 can be provided with threads for connecting the whole steel pull rod with a fixed building and a fixed object waiting for connection of a bridge after the sleeve 1 is connected and fixed with a steel wire rope, a fixing plate waiting for threads can be arranged on the working objects and is connected with the rod body 2 through the threads, the steel pull rod can be connected with other positions with holes matched with the diameter of the rod body, and then the whole steel pull rod is fixed by arranging a nut on the nut fixing end 3.

The steel pull rod can be of a detachable structure, threads can be arranged on one side, close to the rod body 2, of the sleeve 1, and the rod body of the rod body 2 is connected to the sleeve 1 by rotating the adjusting sleeve 1, so that detachable connection is realized; meanwhile, two pairs of connecting buckles can be arranged at the joint of the rod body 2 and the sleeve 1 and are respectively arranged on two sides of the rod body 2 and two sides of the sleeve 1; two connect the buckle that are located body of rod 2 both sides and two connect the buckle position with being located sleeve 1 both sides and be relative, connect the buckle and be used for connecting body of rod 2 and sleeve 1. The connectable structure enables the components of the novel steel pull rod to form good interchangeability relative to the same components produced in a unified mode, and the other parts can use the mode of unified production, so that certain cost can be saved by the design of interchangeability.

The steel pull rod can also be of an integrally formed structure or an integrally welded structure formed by welding the sleeve 1, the rod body 2 and the nut fixing end 3.

The design of the utility model avoids the outer wall of the most important small hole clamping part for connecting the steel wire rope of the steel pull rod from being directly exposed in the external environment, and avoids the possible corrosion;

meanwhile, the utility model can connect the work piece to be connected by additionally arranging the tensioner between the rod body 2 and the fixture to be connected, and the connecting mode of the tensioner can meet the requirements of structural size under different requirements when the raw material is limited;

the utility model discloses can be as an organic whole shaping formula structure for it is more firm when facing various environment, and it also can weld formula structure as an organic whole, especially can be after accomplishing sleeve 1 and wire rope's fixed operation, again with the body of rod 2 welding as an organic whole, avoided at the hydraulic pressure in-process, the body of rod 2 that has even as an organic whole with sleeve 1 is difficult to fixedly, drive vibrations, be not convenient for centre gripping, the not waiting a great deal of adverse effect of focus to processing cause at this moment.

The utility model can be arranged in a detachable structure, comprising a screw thread arranged at the joint between the sleeve 1 and the rod body 2, so that the sleeve and the rod body are connected by the screw thread to realize the detachable structure; two pairs of connecting buckles are arranged at the joint of the rod body 2 and the sleeve 1 and are respectively arranged on two sides of the rod body 2 and two sides of the sleeve 1; two connect the buckle that is located body of rod 2 both sides and is located sleeve 1 both sides are relative in position, connect the buckle be used for connecting the body of rod 2 with sleeve 1, this connect the buckle be prior art, adopt the stainless steel material in GB/T1220, the purpose of realizing this kind of detachable structure is in order to guarantee the high replaceability between each part.

Novel steel tie rod spare if be detachable, then the equipment back that finishes adopts following mode inspection:

(1) firstly applying a tensile force with 10% of the yield strength of the rod body by using a force application assembly, checking whether each assembly is normal or not, and measuring the length L0 of the steel pull rod;

(2) then slowly loading the steel bar body to a tension force K times of the yield strength of the steel bar body, and keeping the load for 10 min;

(3) unloading to a tensile force of 10% of the yield strength of the rod body, measuring the length L1 again and calculating the residual deformation rate delta according to the formula (1);

(4) completely unloading the force application assembly;

wherein the content of the first and second substances,

(5) and after the inspection mode is finished, carrying out a static load breaking test on the novel steel pull rod.

Supplementing: the bearing capacity of the steel pull rod assembly is not lower than the lowest bearing capacity of the rod body.

The point that needs attention when this application steel pull rod body of rod preparation has: the end of the rod body made of a single rod can be machined after forging or directly machined, and is preferably connected by threads or hinges. When the forging is mechanically processed and the screw thread is adopted for connection, the small diameter of the screw thread is ensured not to be smaller than the diameter of the rod body. In the nondestructive testing of the novel steel pull rod, attention needs to be paid to ultrasonic flaw detection of the rod body of the steel pull rod, which meets the B-level regulation of GB/T4162-2008.

The steel pull rod of the utility model also uses alloy steel as the rod body, and adopts magnetic powder inspection when inspecting the end part (the thread part or the O-shaped rod head) of the alloy steel rod body, which is in accordance with the II-level regulation of JB/T5000.15-2007; the stainless steel rod body adopts penetration flaw detection and is in accordance with the 2-grade regulation of JB/T4730.5-2005; ultrasonic flaw detection of the welding stress member is in accordance with the GB/T11345-2013 regulations, and the evaluation result is in accordance with the 2-level requirement; the magnetic particle flaw should meet the regulation of JB/T6061-2007, and the evaluation result should meet the requirement of level II; the ultrasonic flaw detection of the forged steel stress member meets the regulation of GB/T6402-2008, and the evaluation result meets the requirement of grade 3; the magnetic powder flaw detection meets the requirement of grade 2 (excluding stainless steel) according to the regulation of JB/T5000.15-2007; the stainless steel forging adopts penetration flaw detection and is in accordance with the 2-level regulation of JB/T4730.5-2005; the ultrasonic flaw detection of the cast steel stress member meets the GB/T7233.2-2010 regulation, and the evaluation result meets the 2-level requirement; magnetic powder inspection; when stainless steel is used, the evaluation result of the penetrant flaw detection of the casting is required to meet the requirement of grade 2 according to the GB/T9443-2007 regulation.

The ultrasonic flaw detection of the pin shaft of the pull rod structure of the utility model is in accordance with the regulation of GB/T4162-2008, and the evaluation result is in accordance with the B-grade requirement; the magnetic powder flaw detection is regulated according to JB/T5000.15-2007, and the evaluation result meets the requirement of grade 2 (excluding stainless steel); the stainless steel pin shaft adopts penetration flaw detection and is in accordance with the 2-grade regulation of JB/T4730.5-2005.

The surface requirements are as follows: the surface of the steel tie rod should be smooth and not allow for visible flaws such as cracking, folding, delamination, scarring and rusting. The machined steel tie rod assembly should have a surface roughness value no greater than Ra 12.5. The surface protection treatment of the steel pull rod is in accordance with the regulations of relevant standards such as GB50017, GB50205 and the like. The tensile test requirements of the finished product are as follows: the steel tie rod should be able to withstand a tension of K times the yield strength of the rod body. If the relevant technical conditions do not specify a K value, the K value is generally 0.85. The residual deformation rate delta after unloading is not more than 0.2 percent, and each part can rotate flexibly.

Preferably, stainless steel is used as the rod body, and more preferably, the stainless steel pull rod body and the components are made of the materials specified in GB/T1220 and GB/T6967.

The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutes or changes made by the technical personnel in the technical field on the basis of the utility model are all within the protection scope of the utility model.

The reference numerals and drawings in the present invention are for the purpose of the present invention to facilitate understanding of the present invention during and after the application process, and when reading by those skilled in the art, the present invention does not constitute a limitation to the position and connection of the components.

The protection scope of the present invention is subject to the claims.

Those not described in detail in this specification are within the skill of the art.

Claims (9)

1. A steel tie rod, comprising:

one end of the rod body (2) is used for realizing the connection or fixation of the steel pull rod and a fixture to be connected;

the sleeve (1) is connected to the other end of the rod body (2), an opening is formed in one end, away from the rod body (2), of the sleeve (1), and the opening is used for being connected into a steel wire rope;

the inner wall of the sleeve (1) is gradually thickened from a preset position to the bottom of the opening along the direction from the opening inlet.

2. A steel tie rod according to claim 1, characterized in that the thickness of the inner wall of the sleeve (1) becomes thicker in steps in the direction from the entrance of the opening to the bottom of the opening.

3. A steel tie rod according to claim 1, characterized in that the thickness of the inner wall of the sleeve (1) becomes continuously thicker in the direction from the entrance of the opening to the bottom of the opening.

4. A steel tie rod according to claim 2 or 3, wherein the end of the rod body (2) connected or fixed with the fixture to be connected is a nut fixing end (3), and the surface of the nut fixing end (3) is provided with a thread for connecting a nut.

5. A steel tie rod according to claim 2 or 3, wherein a tensioner is added between the rod body (2) and the fixture to which the rod body (2) is to be connected.

6. A steel tie rod according to claim 2 or 3, wherein the sleeve (1) and the rod body (2) are welded as a one-piece structure.

7. A steel tie rod according to claim 2 or 3, wherein the sleeve (1) and the rod body (2) are of an integrally formed structure.

8. A steel tie rod according to claim 2 or 3, characterized in that it is of a detachable construction.

9. The steel tie rod of claim 8, wherein the joint of the rod body (2) and the sleeve (1) is provided with two pairs of connecting buckles which are respectively arranged on two sides of the rod body (2) and two sides of the sleeve (1); the connecting buckles are located on two sides of the rod body (2) and two sides of the sleeve (1) and are opposite in position, and the connecting buckles are used for connecting the rod body (2) and the sleeve (1).

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