Tilted rod assembly structure and pumping apparatus

Abstract

The embodiment of the application provides a kind of inclined pull rod assembly structure and pumping equipment, it is related to pumping machinery technical field.The inclined pull rod assembly structure includes: fixed turret, subframe, inclined pull rod, for connecting the fixed turret and the subframe;Hinge mechanism, set in one end of the inclined pull rod, for connecting one of the fixed turret and the subframe;Adjusting mechanism, set in the other end of the inclined pull rod, for connecting the other of the fixed turret and the subframe, and the adjusting mechanism can adjust the distance between the inclined pull rod and the fixed turret or the subframe.The inclined pull rod assembly structure provided in the application allows certain manufacturing error, significantly reduces the manufacturing and assembly difficulty, and the hinge mechanism and adjusting mechanism can make the connection part of the inclined pull rod, the fixed turret and the subframe not to be blocked, so as to avoid the effect of cracking of the connection part.

Description

Technical Field

[0001] This application relates to the field of pumping machinery technology, and in particular to a tie rod assembly structure and pumping equipment. Background Technology

[0002] The diagonal tie rod of the concrete pump truck is used to connect the subframe and the fixed turret to increase the rigidity of the rear overhang section of the subframe during pumping operations and improve stress distribution.

[0003] In existing technologies, the connection structure of the diagonal tie rod of concrete pump trucks mainly adopts two forms: integral welding and separate assembly. The integral welding type directly welds the diagonal tie rod and the connecting parts into a whole structure, while the separate assembly type designs the diagonal tie rod and the upper and lower connecting parts as separate structures, which are assembled by pins or bolts.

[0004] However, the integrated welding method has problems such as difficulty in controlling the on-site welding quality and the stress concentration caused by welding defects. The modular assembly method has problems such as complex structure, high process requirements and difficult assembly. If forced assembly is required, it will cause structural stress and may even lead to cracking of the turret connection. Utility Model Content

[0005] This application provides a tie rod assembly structure and pumping equipment to facilitate assembly and reduce the risk of cracking at the turret connection.

[0006] In a first aspect, embodiments of this application provide a tie rod assembly structure, including:

[0007] Fixed turret;

[0008] Subframe;

[0009] Diagonal tie rods are used to connect the fixed turret and the subframe;

[0010] A hinge mechanism, located at one end of the tie rod, is used to connect one of the fixed turret and the subframe.

[0011] An adjustment mechanism is provided at the other end of the tie rod for connecting one of the fixed turret and the subframe, and the adjustment mechanism can adjust the distance between the tie rod and the fixed turret or the subframe.

[0012] In one possible implementation, one end of the tie rod is connected to the fixed turret via the hinge mechanism, and the other end of the tie rod is connected to the subframe via the adjustment mechanism.

[0013] In one possible implementation, the hinge mechanism includes:

[0014] A spherical ball bearing includes an outer ring having an inner spherical surface and an inner ring having an outer spherical surface, the inner ring being nested inside the outer ring and slidably connected to the outer ring, and the outer ring being fixedly connected to a fixed turret;

[0015] A pin passes through the inner ring of the ball bearing and is fixedly connected to the inner ring. Both ends of the pin are connected to the tie rod.

[0016] In one possible implementation, the fixed turret is provided with an ear plate, the outer ring is fixedly connected to the ear plate, one end of the diagonal tie rod is provided with a first pin connecting part and a second pin connecting part, both the first pin connecting part and the second pin connecting part are provided with pin connecting holes, and both ends of the pin are connected to the first pin connecting part and the second pin connecting part respectively through the two pin connecting holes.

[0017] In one possible implementation, the adjusting mechanism includes at least one transverse bolt and at least one axial adjusting bolt;

[0018] The subframe is provided with a transverse bolt connecting plate, which is parallel to the axial direction of the diagonal tie rod, and the transverse bolt connecting plate and the diagonal tie rod are connected by the transverse bolt;

[0019] An end plate is provided at one end of the diagonal tie rod near the subframe, and the end plate is perpendicular to the axial direction of the diagonal tie rod. An axial bolt connection plate parallel to the end plate is provided on the subframe, and the end plate and the axial bolt connection plate are connected by the axial adjusting bolt.

[0020] In one possible implementation, both the diagonal tie rod and the transverse bolt connecting plate are provided with oblong holes, and the transverse bolt passes through the oblong holes to connect the diagonal tie rod and the transverse bolt connecting plate.

[0021] In one possible implementation, the tie rod is provided with a plurality of reinforcing ribs along its length.

[0022] In one possible implementation, there are two tie rods, which are arranged side by side and fixedly connected by a connecting rod.

[0023] In one possible implementation, the connection between the tie rod and the fixed turret, and / or the connection between the tie rod and the subframe, is provided with an anti-corrosion coating;

[0024] And / or, the tie rod is a single piece.

[0025] Secondly, embodiments of this application provide a pumping device, including the inclined tie rod assembly structure provided in the first aspect.

[0026] The tie rod assembly structure and pumping equipment provided in this application embodiment utilize a hinge mechanism at one end of the tie rod and an adjustment mechanism at the other end. One of the hinge mechanism and the adjustment mechanism is connected to a fixed turret, and the other is connected to a subframe. The hinge mechanism can deflect at multiple angles, and the adjustment mechanism can adjust the distance between the tie rod and the fixed turret or subframe. This allows for certain manufacturing errors, significantly reducing manufacturing and assembly difficulty. Furthermore, the use of both the hinge mechanism and the adjustment mechanism prevents stiffness at the connection points between the tie rod and the fixed turret or subframe, thus avoiding cracking at the connection points. Attached Figure Description

[0027] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0028] Figure 1 A structural schematic diagram of the tie rod assembly structure provided in this application;

[0029] Figure 2 for Figure 1 An enlarged schematic diagram of part A in the middle;

[0030] Figure 3 for Figure 1 Enlarged diagram of part B.

[0031] Figure label:

[0032] 1. Fixed turret; 11. Ear plate; 2. Diagonal tie rod; 21. First pin shaft connection part; 22. Second pin shaft connection part; 23. End plate; 3. Subframe; 31. Transverse bolt connection plate; 32. Axial bolt connection plate; 4. Pin shaft; 5. Adjustment mechanism; 51. Transverse bolt; 52. Axial adjustment bolt; 6. Connecting rod.

[0033] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0034] First, those skilled in the art should understand that these embodiments are merely for explaining the technical principles of this application and are not intended to limit the scope of protection of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0035] Secondly, it should be noted that, in the description of the embodiments of this application, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0036] The following is an explanation of the terms used in this application:

[0037] Fixed turret: refers to the core load-bearing and functional transfer component in a pump truck that connects the chassis and boom system, and is also the only rotation fulcrum of the boom system;

[0038] Subframe: refers to the reinforced structure of the chassis in a pump truck that bears the load;

[0039] Ball joint structure: It is a flexible connecting component that can achieve multi-directional angle rotation. Through the cooperation of the "sphere" and the "ball socket", the two connected components are allowed to deflect around the center of the sphere in three-dimensional space at multiple angles.

[0040] The diagonal tie rod is used to connect the subframe of the concrete pump truck to the fixed turret, so as to increase the rigidity of the overhanging section of the subframe during pumping operations and improve stress distribution.

[0041] In related technologies, the connection structure of the diagonal tie rod of concrete pump truck mainly takes the following two forms:

[0042] Integrated welded type: The diagonal tie rod and connecting parts are directly welded into an integral structure;

[0043] Split assembly type: The diagonal tie rod and the upper and lower end connecting parts are designed as separate structures and assembled by pins or bolts.

[0044] However, integrated welded rods require on-site welding, which makes it difficult to control the quality of on-site welding, and welding defects can easily lead to problems such as stress concentration. Split-assembly type tie rods are usually composed of three parts (rod body, upper end connector, and lower end connector). The upper and lower end connectors need to be precision machined to ensure the coaxiality of the pin holes. The process requirements are high. If the parallelism of the upper and lower end pin holes is out of tolerance, it will lead to assembly difficulties, and may even cause structural tension due to forced assembly, resulting in cracks at the connection.

[0045] To address the aforementioned technical problems, this application provides a diagonal tie rod assembly structure, including a fixed turret, a subframe, and a diagonal tie rod. One end of the diagonal tie rod is provided with a hinge mechanism for connecting one of the fixed turret and the subframe; the other end of the diagonal tie rod is provided with an adjustment mechanism for connecting the other of the fixed turret and the subframe.

[0046] The tie rod assembly structure provided in this application features a hinge mechanism at one end of the tie rod and an adjustment mechanism at the other end. One of the hinge mechanism and the adjustment mechanism is connected to a fixed turret, and the other is connected to the subframe. The hinge mechanism can deflect at multiple angles, and the adjustment mechanism can adjust the distance between the tie rod and the fixed turret or subframe. Even with certain manufacturing errors, the tie rod can still be installed smoothly, thus reducing the difficulty of manufacturing and assembly. Furthermore, there will be no tightness at the connection points between the tie rod and the fixed turret, or between the tie rod and the subframe, thereby preventing cracking at the connection points.

[0047] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0048] Please refer to Figures 1-3 The first aspect of this application provides a tie rod assembly structure, including:

[0049] The vehicle comprises a fixed turret 1, a subframe 3, a tie rod 2, a hinge mechanism, and an adjusting mechanism 5. The tie rod 2 connects the fixed turret 1 and the subframe 3. The hinge mechanism is located at one end of the tie rod 2 and connects one of the fixed turret 1 and the subframe 3. The adjusting mechanism 5 is located at the other end of the tie rod 2 and connects the other of the fixed turret 1 and the subframe 3.

[0050] The tie rod assembly structure provided in this application features a hinge mechanism at one end of the tie rod 2 and an adjustment mechanism 5 at the other end. One of the hinge mechanism and the adjustment mechanism 5 is connected to the fixed turret 1, and the other is connected to the subframe 3. The hinge mechanism can deflect at multiple angles, and the adjustment mechanism can adjust the distance between the tie rod and the fixed turret or the subframe. Even with certain manufacturing errors, the tie rod 2 can still be installed smoothly, thus reducing the difficulty of manufacturing and assembly. Furthermore, there will be no tightness at the connection points between the tie rod and the fixed turret, or between the tie rod and the subframe, thus protecting the connection points between the tie rod 2 and the fixed turret 1 and the subframe 3 from cracking.

[0051] In one possible implementation, please see Figure 1As shown, one end of the diagonal tie rod 2 is connected to the fixed turret 1 via a hinge mechanism, and the other end of the diagonal tie rod 2 is connected to the subframe 3 via an adjustment mechanism. Connecting the diagonal tie rod 2 to the fixed turret 1 via the hinge mechanism reduces the manufacturing precision requirements of the connection structure between the diagonal tie rod 2 and the fixed turret, while also preventing tension at the connection points and protecting the connection from cracking. The other end of the diagonal tie rod 2 is connected to the subframe 3 via the adjustment mechanism 5, facilitating quick installation.

[0052] In one possible implementation, the installation positions of the articulation mechanism and the adjustment mechanism 5 can also be interchanged, that is, one end of the tie rod 2 is connected to the subframe 3 through the articulation mechanism, and the other end of the tie rod 2 is connected to the fixed turret 1 through the adjustment mechanism 5.

[0053] In one possible implementation, the hinge mechanism is a ball joint structure, which includes: a ball bearing (not shown in the figure) and a pin 4.

[0054] The ball bearing includes an outer ring with an inner spherical surface and an inner ring with an outer spherical surface. The inner ring is nested inside the outer ring and slidably connected to it. The outer ring is fixedly connected to the fixed turret 1. Pin 4, please refer to [link / reference]. Figure 2 As shown, pin 4 passes through the inner ring of the ball bearing and is fixedly connected to the inner ring. Both ends of pin 4 are connected to tie rod 2.

[0055] Spherical plain ball bearings, also known as spherical plain bearings or spherical sliding bearings, consist of an outer ring and an inner ring. The outer ring has an inner spherical surface, and the inner ring has an outer spherical surface. The sliding contact surfaces are treated with phosphating, burring, padding, and spraying, and are equipped with lubrication holes and lubrication grooves. They feature high load capacity, impact resistance, corrosion resistance, and wear resistance, and can achieve multi-directional loads and rotation at certain angles. The connection between the tie rod 2 and the fixed turret 1 is completed by fixing the outer ring of the spherical plain ball bearing to the fixed turret 1, and by passing a pin 4 through the inner ring of the spherical plain ball bearing and fixing both ends of the pin 4 to the tie rod 2. This makes installation convenient and quick. The tie rod 2 is fixed to the inner ring via the pin 4, allowing it to rotate at a certain angle. This reduces manufacturing precision and assembly difficulty, and prevents tightness at the connection point, protecting the connection from cracking.

[0056] In one possible implementation, please refer to Figure 2 The fixed turret 1 is provided with an ear plate 11, and the outer ring is fixedly connected to the ear plate 11. One end of the diagonal tie rod 2 is provided with a first pin shaft connecting part 21 and a second pin shaft connecting part 22. Both the first pin shaft connecting part 21 and the second pin shaft connecting part 22 are provided with pin shaft connecting holes. The two ends of the pin 4 are connected to the first pin shaft connecting part 21 and the second pin shaft connecting part 22 through the two pin shaft connecting holes respectively.

[0057] During installation, first move the diagonal tie rod 2 so that the ear plate 11 is positioned between the first pin connection part 21 and the second pin connection part 22. Then, pass the pin 4 through the pin connection holes provided on the first pin connection part 21 and the second pin connection part 22 and the inner ring of the ball bearing, connecting the inner ring to the diagonal tie rod 2. Even if the parallelism of the pin connection holes exceeds the manufacturing error, the mounting hole in the center of the inner ring can be adjusted to be aligned with the two pin connection holes, without affecting the installation of the pin 4, and there will be no problem of tightness after assembly. Finally, fix the pin 4 to the diagonal tie rod 2 with a nut to complete the connection between the diagonal tie rod 2 and the fixed turret 1. The installation is convenient and quick.

[0058] In one possible implementation, the hinge mechanism can also be a ball joint support, with both ends of the ball joint support connected to the tie rod 2 and the fixed turret 1, respectively. In other embodiments of this application, the hinge mechanism can also take other forms, which are not limited here.

[0059] In related technologies, the two ends of the diagonal tie rod 2, which is assembled in a split manner, are connected to the fixed turret 1 and the subframe 3 respectively by bolts, and the length direction of the bolts is perpendicular to the length direction of the diagonal tie rod 2. The load is mainly transferred by the friction between the bolts and the contact surface of the diagonal tie rod 2. However, it is unreliable to transfer the load by the friction of the contact surface. After being stressed, the contact surface is easy to slide, or a large number of bolts are required to ensure sufficient friction.

[0060] To resolve the above technical issues, please refer to [link / reference]. Figure 3 The adjustment mechanism 5 provided in this application includes at least one transverse bolt 51 and at least one axial adjustment bolt 52; a transverse bolt connecting plate 31 is provided on the subframe 3, the transverse bolt connecting plate 31 is parallel to the axial direction of the diagonal tie rod 2, and the transverse bolt connecting plate 31 and the diagonal tie rod 2 are connected by the transverse bolt 51.

[0061] An end plate 23 is provided at one end of the diagonal tie rod 2 near the subframe 3, and the end plate 23 is perpendicular to the axis of the diagonal tie rod 2. An axial bolt connecting plate 32 parallel to the end plate 23 is provided on the subframe 3. The end plate 23 and the axial bolt connecting plate 32 are connected by an axial adjusting bolt 52.

[0062] The subframe 3 can be initially connected to the tie rod 2 via the transverse bolt connecting plate 31 and the transverse bolt 51. The end plate 23 on the tie rod 2 is connected to the axial bolt connecting plate 32 on the subframe 3 via the axial adjusting bolt 52. By rotating the nut of the axial adjusting bolt 52, the distance between the tie rod 2 and the subframe 3 can be adjusted. Since the length direction of the axial adjusting bolt 52 is parallel to the length direction of the tie rod 2, and the end plate 23 and the axial bolt connecting plate 32 are perpendicular to the length direction of the tie rod 2, the axial adjusting bolt 52 does not rely on the friction of the contact surface to transmit the load. Therefore, it can prevent slippage between the contact surface of the transverse bolt 51 and the tie rod 2, and at the same time reduce the number of bolts used.

[0063] In one possible implementation, both the diagonal tie rod 2 and the transverse bolt connecting plate 31 are provided with oblong holes, and the transverse bolt 51 passes through the oblong holes to connect the diagonal tie rod 2 and the transverse bolt connecting plate 31.

[0064] By creating a slotted hole, the installation of the transverse bolt 51 can be facilitated, reducing the accuracy requirements for the bolt hole location.

[0065] In one possible implementation, please refer to Figure 3 The number of transverse bolts 51 is 6, and the number of axial adjusting bolts 52 is 1. In other embodiments of this application, the number of transverse bolts 51 and axial adjusting bolts 52 may also be other than those required by actual needs, and this application does not limit them.

[0066] In one possible implementation, the tie rod 2 has multiple reinforcing ribs (not shown in the figure) along its length. By adding reinforcing ribs, the stiffness of the tie rod 2 can be improved, and the risk of deformation of the tie rod 2 can be reduced.

[0067] In one possible implementation, please refer to Figure 3 The cross-sectional shape of the diagonal tie rod 2 is U-shaped. Optionally, the cross-sectional shape of the diagonal tie rod 2 can also be I-shaped, circular, square, etc., and this application does not limit it.

[0068] In one possible implementation, please refer to Figure 1 There are two diagonal tie rods 2, which are arranged side by side and fixedly connected by a connecting rod 6. By setting two diagonal tie rods 2, the load-bearing capacity can be improved, and the rigidity of the rear overhang section of the subframe 3 can be increased during pumping operations. At the same time, connecting the two diagonal tie rods 2 by the connecting rod 6 can improve the rigidity of the diagonal tie rods 2 and reduce the risk of deformation.

[0069] It should be noted that the installation positions of the hinge mechanism and the adjustment mechanism 5 on the two diagonal tie rods 2 can be the same or different. Specifically, both hinge mechanisms can be set at one end near the fixed turret 1, and the two adjustment mechanisms 5 can be set at one end of the subframe. Alternatively, both adjustment mechanisms 5 can be set at one end near the fixed turret 1, and the two hinge mechanisms can be set at one end near the subframe 3. Another option is to connect one end of one diagonal tie rod 2 to the fixed turret 1 via a hinge mechanism, and the other end to the subframe 3 via an adjustment mechanism 5. Similarly, one end of the other diagonal tie rod 2 can be connected to the subframe 3 via a hinge mechanism, and the other end to the fixed turret 1 via an adjustment mechanism 5.

[0070] In one possible implementation, the connection points between the tie rod 2 and the fixed turret 1, and between the tie rod 2 and the subframe 3, are provided with anti-corrosion coatings. By applying these anti-corrosion coatings, the corrosion resistance of the connection points can be improved, thereby extending their service life.

[0071] In one possible implementation, the tie rod 2 is a single piece. Specifically, the tie rod 2 can be manufactured by integral molding or by welding; this application does not limit the specific method. By making the tie rod 2 a single piece, the number of parts can be reduced, and assembly efficiency can be improved.

[0072] A second aspect of the embodiments of this application also provides a pumping device, including the above-described tie rod assembly structure.

[0073] Given that the pumping equipment in this embodiment includes the tie rod assembly structure described in any of the above embodiments, the structure and beneficial effects of the pumping equipment including the tie rod assembly structure will not be elaborated further in this embodiment.

[0074] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0075] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0076] Finally, it should be noted that other embodiments of this application will readily conceive of by those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and alterations may be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A tie rod assembly structure, characterized in that, include: Fixed turret; Subframe; Diagonal tie rods are used to connect the fixed turret and the subframe; A hinge mechanism, located at one end of the tie rod, is used to connect one of the fixed turret and the subframe. An adjustment mechanism is provided at the other end of the tie rod for connecting one of the fixed turret and the subframe, and the adjustment mechanism can adjust the distance between the tie rod and the fixed turret or the subframe.

2. The tie rod assembly structure according to claim 1, characterized in that, One end of the diagonal tie rod is connected to the fixed turret via the hinge mechanism, and the other end of the diagonal tie rod is connected to the subframe via the adjustment mechanism.

3. The tie rod assembly structure according to claim 2, characterized in that, The hinge mechanism is a ball joint structure, which includes: A spherical ball bearing includes an outer ring having an inner spherical surface and an inner ring having an outer spherical surface, the inner ring being nested inside the outer ring and slidably connected to the outer ring, and the outer ring being fixedly connected to a fixed turret; A pin passes through the inner ring of the ball bearing and is fixedly connected to the inner ring. Both ends of the pin are connected to the tie rod.

4. The tie rod assembly structure according to claim 3, characterized in that, The fixed turret is provided with an ear plate, and the outer ring is fixedly connected to the ear plate. One end of the diagonal tie rod is provided with a first pin connecting part and a second pin connecting part. Both the first pin connecting part and the second pin connecting part are provided with pin connecting holes. The two ends of the pin are connected to the first pin connecting part and the second pin connecting part respectively through the two pin connecting holes.

5. The tie rod assembly structure according to claim 1, characterized in that, The adjusting mechanism includes at least one transverse bolt and at least one axial adjusting bolt; The subframe is provided with a transverse bolt connecting plate, which is parallel to the axial direction of the diagonal tie rod, and the transverse bolt connecting plate and the diagonal tie rod are connected by the transverse bolt; An end plate is provided at one end of the diagonal tie rod near the subframe, and the end plate is perpendicular to the axial direction of the diagonal tie rod. An axial bolt connection plate parallel to the end plate is provided on the subframe, and the end plate and the axial bolt connection plate are connected by the axial adjusting bolt.

6. The tie rod assembly structure according to claim 5, characterized in that, Both the diagonal tie rod and the transverse bolt connecting plate have oblong holes, and the transverse bolts pass through the oblong holes to connect the diagonal tie rod and the transverse bolt connecting plate.

7. The tie rod assembly structure according to any one of claims 1-6, characterized in that, The tie rod has multiple reinforcing ribs along its length.

8. The tie rod assembly structure according to any one of claims 1-6, characterized in that, The number of the diagonal tie rods is two, the two diagonal tie rods are arranged side by side, and the two diagonal tie rods are fixedly connected by a connecting rod.

9. The tie rod assembly structure according to any one of claims 1-6, characterized in that, The connection between the diagonal tie rod and the fixed turret, and / or the connection between the diagonal tie rod and the subframe, is provided with an anti-corrosion coating; And / or, the tie rod is a single piece.

10. A pumping device, characterized in that, The tie rod assembly structure includes any one of claims 1-9.

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