Contact net pulley compensation device

Abstract

The utility model discloses a catenary pulley compensation device which comprises at least one movable pulley connected with a catenary and used for dragging the catenary, a rope wound on the movable pulley and used for driving the movable pulley to move, and a balance weight for tensioning the rope, the two ends of the traction rope are connected with the free end of the rope, a balance wheel is arranged in the middle of the traction rope, and the balance weight is arranged on the balance wheel; the guide wheel is provided with two rope grooves, and two sections, formed by winding the traction rope around the balance wheel, of the traction rope are arranged in the two rope grooves respectively; according to the technical scheme, the free end of the rope wound in the movable pulley is connected with the balance weight through the traction rope, the traction rope is wound on the balance wheel to form two sections, and the two sections are erected in the two rope grooves of the guide wheel, so that the traction rope cannot twist when the balance weight moves, and potential safety hazards such as untwisting, bulging and rope breaking of the traction rope are avoided.

Description

Technical Field

[0001] The utility model relates to the field of electrified rail transit contact network, in particular to a contact network pulley compensation device. Background Art

[0002] The contact network is an important component of electrified rail transit. Trains draw power from the contact network to run. The contact network is laid over a long distance and will expand and contract due to temperature factors and the action of the pantograph. In order to ensure its reliability and safety, the contact network needs to maintain sufficient tension. A compensation device is set in the contact network to compensate for the problem of insufficient tension or excessive tension caused by contraction. In the prior art, it is common to achieve contact network tension compensation through pulleys and weights, such as the Chinese utility model patent publication No. CN204736720U. The opened electric tension wheel device for railways drives the moving pulley to tighten the contact network through the weight. Since the wire rope in the pulley is a single wire connected to the weight, the weight drives the wire rope to easily rotate freely. After the wire rope rotates and untwists, the gravity of the weight concentrates on the center strand of the wire rope. The breaking force of the single center strand is less than the gravity of the weight, resulting in broken wires and strands of the center strand. After multiple temperature changes, the wire rope is entangled and squeezed with the pulley body, and the broken wires of the center strand are squeezed out from the gaps in the outer steel wire to form a bulge, which poses a great hidden danger to the safe operation of electrified railways or urban rail transit. Utility Model Content

[0003] In order to solve the deficiencies in the prior art, a safe and reliable contact network compensation device is provided, which can prevent the rope connected to the weight from rotating freely. The technical solution adopted by the utility model is:

[0004] A contact network pulley compensation device comprises at least one movable pulley connected to the contact network and traction-applying the contact network, a rope wound around the movable pulley to drive the movable pulley to move, and a weight for tightening the rope;

[0005] It also includes a traction rope with both ends connected to the free ends of the rope, a balance wheel is arranged in the middle of the traction rope, and the weight is arranged on the balance wheel;

[0006] The guide wheel has two rope grooves, and the two sections formed by the traction rope wrapped around the balance wheel are respectively placed in the two rope grooves.

[0007] Furthermore, the two ends of the traction rope and the free end of the rope are connected by a connecting plate.

[0008] Furthermore, the fixed end of the rope is connected to one side of the guide wheel.

[0009] Furthermore, it also includes a fixed pulley connected in series with the guide wheel, and the fixed end of the rope is connected to one side of the movable pulley.

[0010] In this technical solution, the free end of the rope wound around the movable pulley is connected to the weight through a traction rope, and the traction rope is wound around the balance wheel to form two sections and the two sections are placed in two rope grooves of the guide wheel, so that the traction rope will not twist when the weight moves, avoiding the occurrence of safety hazards such as untwisting, bulging, and breaking of the traction rope. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic structural diagram of a pulley compensation device embodiment 1;

[0012] Figure 2 This is a schematic structural diagram of embodiment 2 of the pulley compensation device. DETAILED DESCRIPTION

[0013] The technical solution of the utility model is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0014] like Figure 1 The embodiment 1 shown is a pulley compensation device with a stroke of 1:2, including a movable pulley 1 and a guide wheel 6. The guide wheel 6 is installed on a column (the column is a foundation for setting a compensation device along the railway) through a mounting frame 9. A frame 10 is arranged on the movable pulley 1, and the frame 10 is connected to the contact line a. When the movable pulley 1 moves, it drives the frame 10 to pull the contact line to maintain the contact line tension to achieve compensation.

[0015] The utility model comprises a movable pulley 1 and a frame 10 for installing the movable pulley 1, a contact line a is connected to the frame 10, the movable pulley 1 is moved to drive the frame 10 to compensate the contact line so that the contact line maintains tension, a rope 2 for driving the movable pulley 1 to move is wound around the movable pulley 1, one end of the rope 2 is connected to the mounting frame 9 as a fixed end, after the rope 2 passes around the movable pulley 1, a traction rope 4 is connected to the free end, the traction rope 4 is wound around the guide wheel 6, changes direction and hangs down, and is connected to the sinker 3, specifically, a balancing wheel 5 is arranged in the middle of the traction rope 4, so that the traction rope 4 forms two sections after passing around the guide wheel 6, and the guide wheel 6 has two rope grooves 6-1, the two sections of the traction rope 4 are laid in the two rope grooves 6-1 so that the two ends of the traction rope 4 can be connected to the rope 2, and the sinker 3 is connected to the balancing wheel 5 to generate a downward pulling force on the traction rope 4. The actual compensation process is that when the contact line a contracts, the movable pulley 1 drives the rope to pull the traction rope 4 to drive the weight 3 to move up and down, and the contact line is always kept taut by the gravity of the weight 3. When the weight 3 moves up and down, the traction rope 4 is driven to move by the balance wheel 5. Since the traction rope is divided into two sections by the balance wheel 5 and laid in the two rope grooves 6-1 of the guide wheel, and the two ends are connected to the rope 2, the traction rope 4 will not generate a reverse twisting force to cause the weight 3 to rotate, thereby avoiding the hidden danger of the traction rope 4 being untwisted and causing bulging and breaking.

[0016] In order to facilitate the connection between the two ends of the traction rope 4 and the rope, a triangular connecting plate 7 is used for connection in this embodiment. The hole in the connecting plate 7 for connecting the free end of the rope 2 is located on the mid-perpendicular line of the line connecting the two holes connecting the two ends of the traction rope 4, so that the tension opposing the traction rope 4 and the rope 2 is balanced. In order to facilitate the connection, the ends of the rope 2 and the traction rope 4 are connected to the connecting plate 7 using a wedge-shaped wire clamp 11.

[0017] like Figure 2 The shown embodiment 2 is a pulley compensation device with a 1:3 stroke. Its purpose is to use the labor-saving principle of the pulley group and adopt a lighter weight 3 to provide sufficient tension for the contact line to tension it. Therefore, embodiment 2 only needs to add a fixed pulley 8 on the basis of embodiment 1, that is, a fixed pulley 8 connected in series with the guide wheel 6 is arranged on the mounting frame 9, and the fixed end of the rope 2 is arranged on the frame 10 so that the free end is passed around the fixed pulley 8 and the movable pulley 1 in turn and then connected to the traction rope 4, wherein the traction rope 4, the guide wheel 6, the balance wheel 5 and the weight 3 are arranged in the same manner as in embodiment 1. Through the structure of embodiment 2, although the weight needs to move a longer distance during compensation, the required weight of the weight 3 is relatively much lighter, and the gravity provided by the weight 3 is only 1 / 3 of the tension required for the contact line.

[0018] Similarly, by changing the number of pulleys and the rope winding method, a pulley compensation device with a stroke of 1:4 or even larger can be realized, but due to the limitations of height and size, it is not often implemented in practice and will not be described in detail here. Since the guide wheel 6 in the above two embodiments needs to be provided with two rope grooves 6-1, a parallel pulley or a double-groove pulley cast at one time can be used.

Claims

1. A contact network pulley compensation device, comprising: at least one movable pulley (1) connected to the contact network and traction-applying the contact network, a rope (2) wound around the movable pulley (1) to drive the movable pulley (1) to move, and a weight (3) for tightening the rope (2); Features: Also includes, A traction rope (4) whose two ends are connected to the free ends of the rope (2), a balancing wheel (5) is arranged in the middle of the traction rope (4), and the weight (3) is arranged on the balancing wheel (5); A guide wheel (6) is provided with two rope grooves (6-1), and two sections formed by the traction rope (4) winding around the balance wheel (5) are respectively placed in the two rope grooves (6-1).

2. A contact network pulley compensation device according to claim 1, characterized in that: The two ends of the traction rope (4) and the free end of the rope (2) are connected via a connecting plate (7).

3. The contact network pulley compensation device according to claim 1, characterized in that: The fixed end of the rope (2) is connected to one side of the guide wheel (6).

4. The contact network pulley compensation device according to claim 1, characterized in that: It also includes a fixed pulley (8) connected in series with the guide wheel (6), and the fixed end of the rope (2) is connected to one side of the movable pulley (1).

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