Overhead line crossing construction anti-line-displacement tackle

Abstract

The invention, which relates to the technical field of the electric power engineering, discloses an overhead line crossing construction anti-line-running tackle comprising an operation pulley notch, a wire clamping system and a driven pulley through which a wire passes in sequence. The actuating pulley and the driven pulley are connected to the tackle rack through bearings, and the wire clamping system is located between the actuating pulley and the driven pulley; a centrifugal brake system is further mounted on the actuating pulley, the centrifugal brake system is started for braking under the action of centrifugal force after the clockwise or anticlockwise rotating speed of the actuating pulley reaches a threshold value, the wire clamping system and the centrifugal brake system are arranged in a linkage manner, and the centrifugal brake system is started under the action of the centrifugal force and drives the wire clamping system to clamp a wire at the same time. According to the invention, the centrifugal brake system is matched with the mechanical linkage of the wire clamping system, so that instant, active and high-reliability braking and locking of abnormal bidirectional line displacement risks in overhead line construction are realized, the intrinsic safety level of spanning construction is improved, and the potential safety hazard of a traditional tackle is solved.

Description

Technical Field

[0001] This invention relates to the field of power engineering technology, specifically to a pulley for preventing power line runaway during overhead line crossing construction. Background Technology

[0002] In the construction of high-voltage overhead lines, conductor misalignment has always been a significant technical challenge hindering the safety of power construction. Traditional crossing methods typically employ simple pulleys or mechanical auxiliary equipment without braking devices, which pose obvious safety hazards during actual construction.

[0003] When conductors are subjected to wind loads, construction tension, or sudden external forces, they are highly susceptible to slippage, leading to serious consequences such as conductor detachment and loss of tension control. This not only causes construction interruptions and material losses but may also trigger safety accidents such as falls from heights and equipment damage, posing a serious threat to the lives of construction workers and the stability of power grid operation.

[0004] With the rapid advancement of ultra-high-voltage power grid construction and the upgrading of power infrastructure in my country, the number of construction scenarios involving large spans and significant elevation differences is increasing, placing higher demands on the safety and reliability of construction equipment. Existing pulley systems generally suffer from technical deficiencies such as insufficient braking performance, lack of anti-runaway mechanisms, and poor adaptability, making it difficult to meet the construction needs under complex conditions. Especially when crossing important facilities such as railways, highways, and navigable rivers, the potential consequences of runaway risks are more severe, potentially causing significant socio-economic losses. Summary of the Invention

[0005] The purpose of this invention is to provide a pulley for preventing runaway during overhead line crossing construction, in order to solve the problems currently found in the market as described in the background.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a pulley for preventing power line runaway during overhead line crossing construction, comprising:

[0007] The wires pass through the actuating pulley slot, the wire clamping system, and the driven pulley in sequence;

[0008] A trolley frame, wherein the actuating pulley and the driven pulley are connected to the trolley frame by bearings, and the wire clamping system is located between the actuating pulley and the driven pulley;

[0009] The actuating pulley is also equipped with a centrifugal braking system. When the actuating pulley rotates clockwise or counterclockwise to a threshold speed, the centrifugal braking system is activated by centrifugal force. The wire clamping system is linked to the centrifugal braking system. When the centrifugal braking system is activated by centrifugal force, it simultaneously drives the wire clamping system to clamp the wire.

[0010] Preferably, the centrifugal braking system includes:

[0011] A card holder is provided on the actuating pulley;

[0012] A cam is movably mounted on the card holder, and a guide groove is provided in the cam to allow the card holder to slide.

[0013] A ratchet is also mounted on the trolley frame via bearings;

[0014] The ratchet is hinged to the wire clamping system via a connecting rod;

[0015] When the actuating pulley is not rotating, the cam and the ratchet are not engaged. When the rotational speed of the actuating pulley reaches a threshold, the contour line of the cam guide groove, under the influence of centrifugal force, slides with the card seat, causing the cam ratchet to extend and engage with the ratchet. The ratchet is rotated under force, pushing the connecting rod to start the wire clamping system.

[0016] Preferably, the cam, the card holder, and the ratchet are arranged in two sets, one in the forward direction and the other in the reverse direction, on the actuating pulley;

[0017] Wherein, the hinge point between the ratchet and the connecting rod on the side of the actuating pulley that rotates counterclockwise toward the wire clamping system is located obliquely above the ratchet axis, and the hinge point between the ratchet and the connecting rod on the side of the actuating pulley that rotates clockwise is located obliquely below the ratchet axis.

[0018] Preferably, the wire clamping system includes:

[0019] Upper clamping block, the upper clamping block being fixed to the trolley frame;

[0020] A fixed wedge block is fixed to the trolley frame;

[0021] The lower clamping block is axially connected to the other end of the connecting rod;

[0022] The lower clamping block is wedge-shaped. When the lower clamping block is pushed by the connecting rod, it moves diagonally upward on the fixed wedge to clamp the wire.

[0023] Preferably, the wire clamping system further includes a unidirectional structure, which limits the movement of the lower clamping block in a straight line upwards.

[0024] Preferably, the unidirectional structure includes:

[0025] An inclined rack is provided on the fixed wedge block;

[0026] A pawl, the pawl shaft being connected to the bottom of the lower clamping block;

[0027] When the lower clamping block moves diagonally downward, it is limited by the engagement of the pawl with the inclined rack.

[0028] Preferably, the top of the fixed wedge has a guide groove to cooperate with the bottom guide block of the lower clamping block to make linear movement.

[0029] Preferably, the upper clamping block and / or the fixing wedge block are fixed to the trolley frame by bolts.

[0030] Compared with the prior art, the beneficial effects of the present invention are:

[0031] This invention achieves immediate, proactive, and highly reliable stopping and locking of abnormal bidirectional line run-off risks during overhead line construction through the mechanical linkage of a centrifugal braking system and a conductor clamping system. It significantly improves the inherent safety level and engineering reliability of crossing construction and effectively solves the fundamental safety hazards of traditional pulleys. Attached Figure Description

[0032] The accompanying drawings, as part of this invention, are provided to further illustrate the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation thereof. Clearly, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0033] Figure 1 This is a schematic diagram of a three-dimensional structure of a pulley for preventing runaway during overhead line crossing construction according to the present invention;

[0034] Figure 2 This is a schematic diagram of the main structure of a pulley for preventing runaway lines during overhead line crossing construction according to the present invention;

[0035] Figure 3 This is a schematic diagram of the centrifugal braking system of a pulley for preventing runaway during overhead line crossing construction according to the present invention.

[0036] Figure 4 This is a schematic diagram of the conductor clamping system of the overhead line crossing construction anti-runaway pulley according to the present invention;

[0037] Figure 5 This is a schematic diagram of a unidirectional structure of a conductor clamping system for preventing runaway conductors during overhead line crossing construction, according to the present invention.

[0038] Figure 6 This is a schematic diagram of a pulley clamping trigger structure for preventing line slippage during overhead line crossing construction according to the present invention.

[0039] In the diagram: 1. Pulley frame; 2. Cam; 3. Ratchet; 4. Actuating pulley; 5. Clamping seat; 6. Bearing; 7. Connecting rod; 8. Lower clamping block; 9. Fixed wedge; 10. Upper clamping block; 11. Pawl; 12. Inclined rack; 13. Driven pulley. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Please see Figures 1-6 A type of overhead power line crossing construction safety trolley, such as... Figure 1 As shown, it includes: an actuating pulley 4 slot through which the wire passes in sequence, a wire clamping system, and a driven pulley 13; the actuating pulley 4 and the driven pulley 13 are connected to the trolley frame 1 by bearings 6, and the wire clamping system is located between the actuating pulley 4 and the driven pulley 13; wherein, a centrifugal brake system is also installed on the actuating pulley 4, and after the actuating pulley 4 rotates clockwise or counterclockwise to a threshold speed, the centrifugal brake system is activated by centrifugal force to brake, and the wire clamping system is linked with the centrifugal brake system, and the centrifugal brake system is activated by centrifugal force to clamp the wire.

[0042] It should be noted that: In this embodiment, the actuating pulley 4 serves as the braking trigger pulley of the entire trolley system, and also acts as the sliding motion wheel of the conductor. When the trolley system moves too fast on the conductor, the rotation speed of the actuating pulley 4 is increased synchronously to cooperate with the centrifugal brake system for corresponding braking.

[0043] As further explained: the centrifugal braking system includes: a locating seat 5 mounted on the actuating pulley 4; a cam 2 movably mounted on the locating seat 5, and a guide groove for sliding the locating seat 5 is provided in the cam 2; a ratchet 3 is also mounted on the trolley frame 1 via a bearing 6; the ratchet 3 is hinged to the wire clamping system via a connecting rod 7; wherein, the cam 2, the locating seat 5 and the ratchet 3 are arranged in two sets on the actuating pulley 4 in both forward and reverse directions.

[0044] It should be noted that: the hinge point between the ratchet 3 and the connecting rod 7 on the side of the actuating pulley 4 that rotates counterclockwise toward the wire clamping system is located diagonally above the axis of the ratchet 3, and the hinge point between the ratchet 3 and the connecting rod 7 on the side of the actuating pulley 4 that rotates clockwise is located diagonally below the axis of the ratchet 3.

[0045] When the actuating pulley 4 is not rotating, the cam 2 and the ratchet 3 are not engaged. When the rotational speed of the actuating pulley 4 reaches the threshold, the contour line of the guide groove of the cam 2 slides with the card seat 5 under the influence of centrifugal force, causing the ratchet of the cam 2 to extend and engage with the ratchet 3. The ratchet 3 is rotated under force, pushing the connecting rod 7 to start the wire clamping system.

[0046] As further explained, the wire clamping system includes: an upper clamping block 10, fixed to the trolley frame 1; a fixed wedge block 9 fixed to the trolley frame 1; and a lower clamping block 8 axially connected to the other end of the connecting rod 7. The lower clamping block 8 is wedge-shaped, and when pushed by the connecting rod 7, it moves diagonally upwards on the fixed wedge block 9 to clamp the wire. The wire clamping system also includes a one-way structure, which limits the movement of the lower clamping block 8 after its diagonal upward movement.

[0047] It should be noted that the unidirectional structure includes: a helical rack 12, which is mounted on the fixed wedge 9; and a pawl 11, which is axially connected to the bottom of the lower clamping block 8. When the lower clamping block 8 moves diagonally downward, it is limited by the engagement of the pawl 11 with the helical rack 12. A guide groove is provided on the top of the fixed wedge 9 to cooperate with the guide block at the bottom of the lower clamping block 8 for linear movement. The upper clamping block 10 and / or the fixed wedge 9 are fixed to the trolley frame 1 by bolts.

[0048] In practice: the wire passes through the slot of the actuating pulley 4, the gap between the upper clamping block 10 and the lower clamping block 8, and the slot of the driven pulley 13, and is in normal working condition, such as... Figure 2 As shown, cam 2 and ratchet 3 are disengaged and not meshed. If the wire runs abnormally, it will drive pulley 4 to rotate. When the speed threshold is reached, the centrifugal braking system will be triggered.

[0049] Taking the counterclockwise rotation of the wire clamping system as an example, the actuating pulley 4 rotates counterclockwise to reach the speed threshold, and the cam 2, restricted by the chuck 5, rotates relative to the inner contour line until it reaches the locked position. The ratchet teeth on the outer contour of the cam 2 engage and drive the ratchet 3 to rotate counterclockwise. Figure 3 As shown. The ratchet 3 drives the connecting rod 7 to push the lower clamping block 8 along the guide groove on the inclined surface of the fixed wedge block 9. The working surface of the lower clamping block 8 and the working surface of the upper clamping block 10 generate a clamping force, clamping the faulty wire, as shown. Figure 4 As shown. The lower clamping block 8 moves, causing the pawl 11 to engage with the inclined rack 12 at the inclined side of the fixed wedge block 9, as... Figure 5 As shown, even if the thrust of connecting rod 7 disappears, the wedge remains clamped.

[0050] By completing the above actions, an emergency braking effect can be applied to the conductor if it runs off one side of the trolley, thus creating an accident situation. Figure 6As shown. Due to the use of symmetrical reverse braking, when the line deviates in the clockwise direction: the actuating pulley 4 rotates clockwise to reach the speed threshold, and the cam 2 and ratchet 3, which are symmetrically installed in opposite directions on the other side of the pulley, and... Figure 3 The directions shown are opposite, and both are subjected to centrifugal force. The side cam 2 rotates along its inner contour to the locked position in the holder 5, while its outer contour engages and drives its associated ratchet 3 to rotate clockwise. Due to the change in position of the reverse linkage 7, as... Figure 5 As shown, this also pushes the associated lower clamping block 8 to move along its guide groove on the inclined surface of the corresponding fixed wedge block 9, thereby clamping the wire. At the same time, the pawl 11 of the lower clamping block 8 engages with the inclined rack 12 on the fixed wedge block 9 to achieve self-locking.

[0051] After confirming that the wire misalignment is completely under control (the conductor is effectively braked and clamped), the root cause of the misalignment is addressed manually (such as adjusting the tension system or eliminating external interference). A reset operation can be performed by manually rotating ratchet 3 back to its initial state, causing the lower clamping block 8 to move in the opposite direction along the inclined surface of the fixed wedge block 9. This releases the clamping force on the conductor, restoring the conductor tension to a controlled state and enabling smooth traction. The rotational speed of the actuating pulley 4 falls below the threshold, and the centrifugal force acting on the cam 2 disappears. During the reset process, the cam 2 is manually rotated to disengage from the locking state of the chuck 5, disengaging its outer contour from the ratchet 3. After the braking device is fully reset, the conductor can move smoothly in the trolley, and traction work can continue.

[0052] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A pulley for preventing power line derailment during overhead line crossing construction, characterized in that, include: The wires pass through the slot of the actuating pulley (4), the wire clamping system and the driven pulley (13) in sequence. The pulley frame (1) is connected to the pulley frame (1) by the actuating pulley (4) and the driven pulley (13) via bearings (6), and the wire clamping system is located between the actuating pulley (4) and the driven pulley (13); The actuating pulley (4) is also equipped with a centrifugal braking system. When the actuating pulley (4) rotates clockwise or counterclockwise to a threshold speed, the centrifugal braking system is activated by centrifugal force. The wire clamping system is linked with the centrifugal braking system. When the centrifugal braking system is activated by centrifugal force, it drives the wire clamping system to clamp the wire.

2. The overhead line crossing construction anti-runaway pulley according to claim 1, characterized in that: The centrifugal braking system includes: The card holder (5) is provided on the actuating pulley (4); A cam (2) is movably mounted on the card holder (5), and a guide groove is provided in the cam (2) to allow the card holder (5) to slide. A ratchet (3) is also mounted on the trolley frame (1) via a bearing (6); The ratchet (3) is hinged to the wire clamping system via a connecting rod (7); When the actuating pulley (4) is not rotating, the cam (2) and the ratchet (3) are not engaged. When the rotation speed of the actuating pulley (4) reaches the threshold, the contour line of the guide groove of the cam (2) is affected by the centrifugal force and slides with the card seat (5) so that the ratchet of the cam (2) extends out and engages with the ratchet (3). The ratchet (3) is rotated by force and pushes the connecting rod (7) to start the wire clamping system.

3. The overhead line crossing construction anti-runaway pulley according to claim 2, characterized in that: The cam (2), the card holder (5), and the ratchet (3) are respectively arranged in two sets on the actuating pulley (4) in the forward and reverse directions; Among them, the hinge point between the ratchet (3) and the connecting rod (7) on the side of the actuating pulley (4) that rotates counterclockwise toward the wire clamping system is located obliquely above the axis of the ratchet (3), and the hinge point between the ratchet (3) and the connecting rod (7) on the side of the clockwise rotation is located obliquely below the axis of the ratchet (3).

4. The overhead line crossing construction anti-runaway pulley according to claim 3, characterized in that: The wire clamping system includes: Upper clamping block (10), the upper clamping block (10) is fixed on the trolley frame (1); A fixed wedge (9) is fixed to the trolley frame (1); The lower clamping block (8) is axially connected to the other end of the connecting rod (7); The lower clamping block (8) is wedge-shaped. When the lower clamping block (8) is pushed by the connecting rod (7), the lower clamping block (8) moves diagonally upward on the fixed wedge block (9) to clamp the wire.

5. The overhead line crossing construction anti-runaway pulley according to claim 4, characterized in that: The wire clamping system also includes a unidirectional structure, which limits the movement of the lower clamping block (8) in a straight line upwards.

6. The overhead line crossing construction anti-runaway pulley according to claim 5, characterized in that: The unidirectional structure includes: A helical rack (12) is provided on the fixed wedge (9); A pawl (11) is axially connected to the bottom of the lower clamping block (8); When the lower clamping block (8) moves diagonally downward, it is limited by the engagement of the pawl (11) with the inclined rack (12).

7. The overhead line crossing construction anti-runaway pulley according to any one of claims 4-6, characterized in that: The top of the fixed wedge (9) has a guide groove that works in conjunction with the bottom guide block of the lower clamping block (8) to make linear motion.

8. The overhead line crossing construction anti-runaway pulley according to claim 7, characterized in that: The upper clamping block (10) and / or the fixed wedge block (9) are fixed to the trolley frame (1) by bolts.

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