A rotary jib base

Abstract

The utility model discloses a rotary wrist arm base, including fixed base, adjusting screw rod, rotary base, connecting rod and sliding pin seat, wherein, the fixed base is along vertical direction and is set up with the limit sliding slot, the rotary base upper portion is connected with one side of fixed base and rotates, the adjusting screw rod verticality sets up and can rotatably install on fixed base, and along its own axis rotates and lifts, the sliding pin seat sets up in the limit sliding slot, and with the bottom end drive connection of adjusting screw rod, by adjusting screw rod drive sliding pin seat along limit sliding slot and adjust up and down in vertical direction, the one end of connecting rod is rotatably connected with the lower part of rotary base, and the other end is rotatably connected with sliding pin seat, the utility model not only can realize accurate, continuous, convenient adjustment to the installation angle of positioning line clamp, especially vertical direction angle, but also can reduce material cost, avoid the problem that there is stress concentration in certain sharp edge part, fundamentally improve the construction quality of catenary, operation reliability and maintenance convenience.

Description

Technical Field

[0001] This utility model belongs to the field of electrified railway and mechanical engineering technology, and specifically relates to a rotating wrist arm base. Background Technology

[0002] The overhead contact system of high-speed railways is a special type of power transmission line erected above the railway line to supply power to electric locomotives. It is the heart of the electrified railway traction power supply system, and its operational reliability directly affects the safety and efficiency of train operation. Positioning clamps, as key components of the positioning device in the contact system, bear the dual responsibility of fixing the position of the contact wire and transmitting mechanical loads and electrical current. Their installation quality, especially the accuracy of the installation angle, is crucial for ensuring good current collection between the contact system and the pantograph, reducing abnormal wear, suppressing arcing, and ensuring reliable power transmission.

[0003] During the construction and maintenance of the overhead contact line, the installation angle of the positioning clamps must meet strict process requirements. Ensuring the accuracy of the vertical installation angle of the positioning clamps is crucial for achieving precise current conduction in the contact wire and preventing localized hard spots and stress concentrations.

[0004] The positioning clamp currently in use (CN 118665278 A, such as...) Figure 1 Although it has vertical adjustability (as shown), it also has the following problems: (1) The original fixed pin seat 7 adopts a square structure with vertical transition between the surfaces, forming a natural sharp edge, which easily causes stress concentration and affects the long-term reliability and safety of the structure.

[0005] (2) The wire clamp has high processing requirements and material costs. Its fixing pin structure relies on four threads on the back for positioning, which requires precise alignment with the central through hole and mating threads, resulting in high overall processing accuracy requirements and difficult assembly. In addition, the fixing pin needs to be made of cold-drawn special stainless steel, which has high material costs. The blank volume is large, and it is easy to stick to the tool when milling the outer contour, resulting in low processing efficiency and large processing volume, which further increases the manufacturing cost. Utility Model Content

[0006] To address the aforementioned issues, this invention provides a rotating bracket base that not only enables precise, continuous, and convenient adjustment of the positioning clamp installation angle, particularly the vertical angle, but also reduces material costs and avoids stress concentration at certain sharp edges, fundamentally improving the construction quality, operational reliability, and maintenance convenience of the contact network.

[0007] The main technical solution adopted in this utility model is as follows: A rotating arm base includes a fixed base, an adjusting screw, a rotating base, a connecting rod, and a sliding pin seat, wherein... A limiting groove is provided in the fixed base along the vertical direction; The upper part of the rotating base is rotatably connected to one side of the fixed base; The adjusting screw is vertically arranged and rotatably mounted on the fixed base, and rotates and rises along its own axis; The sliding pin seat is disposed in the limiting slide groove and is drivenly connected to the bottom end of the adjusting screw. The adjusting screw drives the sliding pin seat to adjust vertically along the limiting slide groove. One end of the connecting rod is rotatably connected to the lower part of the rotating base, and the other end is rotatably connected to the sliding pin seat.

[0008] Preferably, the upper part of the side where the fixed base connects to the rotating base is integrally formed with a double-ear seat, and the upper part of the rotating base is rotatably connected to the double-ear seat by a pin.

[0009] Preferably, the top of the sliding pin seat is provided with a limiting groove with an opening on one side, and the vertical cross section of the limiting groove is inverted T-shaped, which is used to engage and limit the bottom end of the adjusting screw; the bottom of the sliding pin seat is provided with a U-shaped through groove with an opening facing downward, and the end of the connecting rod is rotatably connected to the U-shaped through groove by a pin.

[0010] Preferably, the lateral opening of the limiting groove in the fixed base is used to accommodate the up-and-down movement of the connecting rod.

[0011] Preferably, the top of the fixed base is provided with a stepped through hole communicating with the limiting slide groove, and a self-tapping sleeve is provided in the stepped through hole. The adjusting screw passes through the self-tapping sleeve and is threadedly connected to it.

[0012] Preferably, the bottom outer periphery of the self-tapping screw sleeve is designed with a limiting protrusion, the top surface of which abuts against the stepped surface of the stepped through hole to restrict the upward movement of the self-tapping screw sleeve.

[0013] Preferably, the limiting protrusion has a non-circular outer peripheral surface, and the outer peripheral surface includes at least one planar segment, which mates with the inner wall surface of the stepped through hole to form a circumferential limit.

[0014] Preferably, the top of the fixed base is provided with a through hole, the inner circumferential surface of the through hole is machined with an internal thread, the threaded sleeve is threadedly installed in the through hole, and the adjusting screw passes through the through hole and is threadedly connected to the threaded sleeve.

[0015] Beneficial effects: This utility model provides a rotating wrist arm base, which has the following advantages: (1) This utility model uses a self-tapping screw sleeve to limit the installation on the fixed base, replacing the original fixed pin seat. On the one hand, the self-tapping screw sleeve only needs clearance fit to be positioned, which reduces the requirements for processing accuracy and saves materials and manufacturing costs. On the other hand, the structure mostly uses arc surface contact, which avoids stress concentration at sharp edges, effectively strengthens the mechanical properties of the overall structure and improves the durability of the structure.

[0016] (2) Through the optimized design of the linkage mechanism, this utility model ensures that the linkage is continuously subjected to an upward force during the overall adjustment process. The upward component of this force always creates a lifting effect on the linkage, thereby ensuring that the self-tapping sleeve will not loosen or fall off.

[0017] (3) By designing the limiting protrusion of the self-tapping screw sleeve, the non-circular outer peripheral surface and the inner wall surface of the stepped through hole are used to form a circumferential limit, which can effectively prevent the self-tapping screw sleeve from rotating and ensure the stability and reliability of adjustment. Attached Figure Description

[0018] Figure 1 For existing rotating wrist arm bases; Figure 2 This is a schematic diagram of the rotating wrist arm base structure of Example 1; Figure 3 This is a partial structural diagram of Example 1; Figure 4 This is a schematic diagram of the fixed base structure in Example 1. Figure I ; Figure 5 This is a schematic diagram of the fixed base structure in Example 1. Figure II ; Figure 6 This is a vertical cross-sectional view of Example 1; Figure 7 This is a schematic diagram of the self-tapping screw in Example 1; Figure 8 This is a vertical cross-sectional view of Example 2; In the diagram: 1. Fixed base, 1-1. Limiting slide groove, 1-2. Double ear seat, 1-3. Stepped through hole, 1-4. Through hole, 1-5. Threaded sleeve, 2. Adjusting screw, 3. Rotating base, 3-1. Pin, 3-1. Connecting rod, 4. Pin shaft, 4-1. Sliding pin seat, 5. Limiting groove, 5-1. U-shaped through groove, 5-2. Self-tapping screw sleeve, 6. Limiting protrusion, 6-1. Flat section, 6-12. Fixed pin seat, 7. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application are clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application. Example 1

[0020] like Figure 1-3 As shown, a rotating wrist arm base includes a fixed base 1, an adjusting screw 2, a rotating base 3, a connecting rod 4, and a sliding pin seat 5, wherein... A limiting groove 1-1 is provided in the fixed base 1 along the vertical direction; The upper part of the rotating base 3 is rotatably connected to one side of the fixed base; The adjusting screw 2 is vertically set and rotatably mounted on the fixed base 1, and can rotate and rise along its own axis; The sliding pin seat 5 is set in the limiting slide groove 1-1 and is driven to the bottom end of the adjusting screw 2. The adjusting screw 2 drives the sliding pin seat 5 to adjust vertically along the limiting slide groove. One end of the connecting rod 4 is rotatably connected to the lower part of the rotating base 3, and the other end is rotatably connected to the sliding pin seat 5.

[0021] like Figure 4 As shown, a double-ear seat 1-2 is integrally formed on the upper part of the side where the fixed base 1 connects to the rotating base 3, and the rotating base 3 is rotatably connected to the double-ear seat 1-2. In this embodiment 1, the rotating base 3 is rotatably connected to the double-ear seat 1-2 by a pin 3-1. This integrated double-ear seat structure significantly enhances the strength and reliability of the connection between the two bases.

[0022] like Figure 3 As shown, the top of the sliding pin seat 5 is provided with a limiting groove 5-1 with an opening on one side. The vertical cross-section of the limiting groove 5-1 is inverted T-shaped, used to engage and limit the bottom end of the adjusting screw 2. The bottom of the sliding pin seat 5 is provided with a U-shaped through groove 5-2 with an opening facing downwards. The end of the connecting rod 4 is rotatably connected to the U-shaped through groove 5-2 by a pin. In this embodiment 1, the connecting rod 4 is rotatably connected to the U-shaped through groove 5-2 by a pin 4-1.

[0023] like Figure 4-5 As shown, the lateral opening of the limiting groove 1-1 inside the fixed base 1 is used to accommodate the up-and-down movement of the connecting rod 4.

[0024] like Figure 5 As shown, the top of the fixed base 1 is provided with a stepped through hole 1-3 that communicates with the limiting slide groove 1-2. A self-tapping screw sleeve 6 is provided in the stepped through hole 1-3. The adjusting screw 2 passes through the self-tapping screw sleeve 6 and is threadedly connected to it.

[0025] like Figure 6 As shown, the bottom outer periphery of the self-tapping screw sleeve 6 is designed with a limiting protrusion 6-1. The top surface of the limiting protrusion 6-1 abuts against the stepped surface of the stepped through hole 1-3 to restrict the upward movement of the self-tapping screw sleeve 6.

[0026] To further prevent the self-tapping sleeve from rotating, in this embodiment 1, as follows: Figure 7 As shown, the limiting protrusion 6-1 has a non-circular outer peripheral surface, and the outer peripheral surface includes at least one planar segment 6-12. The planar segment mates with the inner wall surface of the stepped through hole to form a circumferential limit.

[0027] The working principle of this utility model is as follows: The adjusting screw 2 is vertically installed in the self-tapping screw sleeve (or threaded through hole) of the fixed base 1. When the adjusting screw 2 is rotated, due to the threaded engagement, the adjusting screw will move up and down along its own axis. The bottom end of the adjusting screw 2 is engaged with the inverted T-shaped limiting groove 5-1 on the top of the sliding pin seat 5. When the adjusting screw moves up and down, it drives the sliding pin seat 5 to move up and down vertically along the limiting groove 1-1 in the fixed base 1. The movement of the sliding pin seat 5 is constrained by the limiting groove 1-1 to ensure linear movement. The bottom of the sliding pin seat 5 is rotatably connected to one end of the connecting rod 4 through the pin shaft 4-1, and the other end of the connecting rod 4 is rotatably connected to the lower part of the rotating base 3 through the pin 3-1. When the sliding pin seat 5 moves up and down, the connecting rod 4 will push or pull the lower part of the rotating base, causing the rotating base 3 to rotate around its connection point (pin connection) with the double-ear seat on the upper part of the fixed base 1. The rotation of the rotating base 3 changes its overall angle, thereby adjusting the vertical angle of the positioning clamp mounted on the rotating base. Precise and continuous control of the positioning clamp angle can be achieved by continuously adjusting the rotation of the adjusting screw.

[0028] During adjustment, because the rotating base 3 is suspended by a cantilever and a busbar device, its gravity amplifies through the long lever arm formed by the cantilever and is transmitted to the connecting rod 4 connected to it, so that the connecting rod is continuously subjected to an upward force. The force can be decomposed into a vertically upward component, which produces a lifting effect on the connecting rod, thereby ensuring that the self-tapping sleeve will not loosen and fall.

[0029] In this utility model, in order to prevent the self-tapping screw sleeve from loosening and falling, the following additional safety measures can be provided: (1) Apply resin glue to the outside of the self-tapping screw sleeve 6 to make it rigidly bonded to the fixed base. (2) Install a locking nut on the adjusting screw 2, and tighten the locking nut after adjustment. (3) When installing, heat the aluminum alloy fixed base to expand the inner hole, and then fit the stainless steel screw sleeve in, combining the principle of thermal expansion and contraction + interference fit. (4) Install a limiting screw from one side of the fixed base to cooperate with the self-tapping screw sleeve to limit and prevent it from falling. Example 2

[0030] like Figure 8 As shown, in Embodiment 2, instead of using the self-tapping sleeve 6, a through hole 1-4 is directly designed on the top of the fixed base 1. The inner circumferential surface of the through hole 1-4 is machined with internal threads, and a threaded sleeve 1-5 is placed inside the through hole 1-4. The adjusting screw 2 passes through the through hole 4-1 and is threadedly connected to the threaded sleeve 1-5. The remaining structure is the same as in Embodiment 1. In this Embodiment 2, the threaded sleeve 1-5 can be, but is not limited to, a standard steel wire threaded sleeve.

[0031] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A rotating wrist arm base, characterized in that, It includes a fixed base, an adjusting screw, a rotating base, a connecting rod, and a sliding pin seat, among which, A limiting groove is provided in the fixed base along the vertical direction; The upper part of the rotating base is rotatably connected to one side of the fixed base; The adjusting screw is vertically arranged and rotatably mounted on the fixed base, and rotates and rises along its own axis; The sliding pin seat is disposed in the limiting slide groove and is drivenly connected to the bottom end of the adjusting screw. The adjusting screw drives the sliding pin seat to adjust vertically along the limiting slide groove. One end of the connecting rod is rotatably connected to the lower part of the rotating base, and the other end is rotatably connected to the sliding pin seat.

2. The rotating wrist arm base according to claim 1, characterized in that, The upper part of the side where the fixed base connects to the rotating base is integrally formed with a double-ear seat, and the upper part of the rotating base is rotatably connected to the double-ear seat by a pin.

3. The rotating wrist arm base according to claim 1, characterized in that, The top of the sliding pin seat is provided with a limiting groove with an opening on one side. The vertical cross-section of the limiting groove is inverted T-shaped, which is used to engage and limit the bottom end of the adjusting screw. The bottom of the sliding pin seat is provided with a U-shaped through groove with an opening facing downward. The end of the connecting rod is rotatably connected to the U-shaped through groove by a pin.

4. The rotating wrist arm base according to claim 1, characterized in that, The lateral opening of the limiting groove in the fixed base is used to accommodate the up-and-down movement of the connecting rod.

5. The rotating wrist arm base according to any one of claims 1-4, characterized in that, The top of the fixed base is provided with a stepped through hole that communicates with the limiting slide groove. A self-tapping sleeve is provided in the stepped through hole, and the adjusting screw passes through the self-tapping sleeve and is threadedly connected to it.

6. The rotating wrist arm base according to claim 5, characterized in that, The bottom outer periphery of the self-tapping screw sleeve is designed with a limiting protrusion. The top surface of the limiting protrusion abuts against the stepped surface of the stepped through hole to restrict the upward movement of the self-tapping screw sleeve.

7. The rotating wrist arm base according to claim 6, characterized in that, The limiting protrusion has a non-circular outer peripheral surface, which includes at least one planar segment. The planar segment mates with the inner wall of the stepped through hole to form a circumferential limit.

8. The rotating wrist arm base according to any one of claims 1-4, characterized in that, The top of the fixed base is provided with a through hole, and the inner circumferential surface of the through hole is machined with an internal thread. The threaded sleeve is threadedly installed in the through hole, and the adjusting screw passes through the through hole and is threadedly connected to the threaded sleeve.

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