Anti-back-twist jack for bridge inhaul cable

Abstract

The utility model discloses an anti-back-twist jack for a bridge inhaul cable, which comprises a jack, a tensioning rod is arranged on the jack, the peripheral side of the tensioning rod is connected with a tensioning rod nut, one side of the tensioning rod nut adjacent to the jack is provided with a limiting plate, the upper end of the jack is provided with a fixed seat, and the fixed seat is provided with a limiting plate. A bottom plate and a side plate are arranged in the fixing base, a reinforcing plate is installed on one side of the side plate, and an inserting plate is installed on one side of the bottom plate. When the jack begins to work, the piston ascends to abut against the limiting plate and the tensioning rod nut, if the inhaul cable is twisted, the protruding parts at the two ends of the limiting plate abut against the fixing base, through friction force between the limiting plate and the tensioning rod nut, the tensioning rod nut is prevented from being unscrewed, the inhaul cable is prevented from being untwisted, and the situation that the jack rotates together due to untwisting of the inhaul cable can be avoided; the oil leakage of the jack, the damage of the jack and the casualty accidents are avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge cable installation, and in particular relates to an anti-back-twist jack for bridge cables. Background Art

[0002] When making the cable, the steel wire bundle is slightly twisted in the left hand with a twist degree of 2° to 4°, so as to facilitate the winding and unwinding of the cable without affecting the performance of the cable. Due to the twist, when the cable is tensioned, the twisted steel wire generates a component force in the tangential direction of the cable cross section, forming a large torque. When the external force cannot resist the torque generated by the steel wire, the cable body rotates in the opposite direction of the twist of the steel wire, and the detwisting phenomenon will occur.

[0003] If there is no anti-back-twist device for cables with larger specifications, when the inclined cables are tensioned, the back-twist of the cable body will also cause the tension rod and the tension rod nut to bear a large torque at the same time. The large torsional force between the jack piston and the cylinder body cannot be overcome, causing the cable body to drive the jack piston to rotate together, causing the inclined cable to back-twist, resulting in oil leakage from the jack and endangering the safety of tensioning equipment and personnel. Therefore, those skilled in the art provide an anti-back-twist jack for bridge cables to solve the problems raised in the above background technology. Summary of the invention

[0004] In view of the deficiencies in the prior art, the utility model provides an anti-back-twisting jack for bridge cables to solve the problem that the large torsional force between the jack piston and the cylinder body cannot be overcome, causing the cable body to drive the jack piston to rotate together, resulting in back-twisting of the inclined cable.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an anti-back-twist jack for bridge cables, comprising a jack, a tension rod is arranged on the jack, a tension rod nut is connected to the circumference of the tension rod, a limiting plate is arranged on the side of the tension rod nut adjacent to the jack, a fixed seat is installed at the upper end of the jack, the fixed seat includes a bottom plate and a side plate, a reinforcing plate is installed on one side of the side plate, an insert plate is installed on one side of the bottom plate, and a positioning hole is opened at the bottom of the insert plate.

[0006] Furthermore, the limit plate is sleeved with the tension rod, and the limit plate is in contact with the tension rod nut. Both ends of the limit plate are provided with protrusions, and the protrusions of the limit plate are clamped with the fixed seat. If the cable is twisted, the protrusions at both ends of the limit plate will resist the fixed seat. The friction between the limit plate and the tension rod nut can prevent the tension rod nut from being dethreaded, and the cable from being twisted back. It can also prevent the jack from rotating together due to the twisting back of the cable, causing the jack to leak oil and damage the jack.

[0007] Furthermore, a slot is provided on the side wall of the jack, and the fixing seat is limitedly plugged into the slot through an insert plate, so as to facilitate positioning of the fixing seat.

[0008] Furthermore, a limiting groove is provided below the slot, a limiting rod is vertically installed on the bottom side wall of the limiting groove, a pressure spring is sleeved around the limiting rod, a latch is slidably sleeved on the limiting rod, and the latch is positioned and plugged into the positioning hole at the bottom of the plug plate under the pressure of the pressure spring, so that the fixing seat is firmly fixed on the jack, and this fixing method is simple and quick when removing the fixing seat, and the fixing seat can be taken out by pressing the latch downward. Beneficial Effects

[0009] Through the design, when the jack starts working, the piston moves upward to tighten the limit plate and the tension rod nut. If the cable twists, the protrusions at both ends of the limit plate will press against the fixed seat. The friction between the limit plate and the tension rod nut can prevent the tension rod nut from being dethreaded, avoid the cable from twisting back, and prevent the jack from rotating together due to the twisting back of the cable, causing oil leakage from the jack, damage to the jack and casualties. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0011] Figure 2 It is an enlarged view of the local structure of the utility model;

[0012] Figure 3 It is a structural schematic diagram of the fixing seat of the utility model;

[0013] Figure 4 It is a structural schematic diagram of the limiting plate of the utility model.

[0014] In the figure: 1. jack; 2. fixing seat; 201. bottom plate; 202. side plate; 203. reinforcing plate; 204. plug plate; 205. positioning hole; 3. limit plate; 4. tension rod nut; 5. tension rod; 6. limit groove; 7. limit rod; 8. pressure spring; 9. latch; 10. slot. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] The utility model provides a technical solution, a torsion-proof jack for bridge cables, see Figure 1 , Figure 3 , Figure 4 , including a jack 1, on which a tension rod 5 is arranged, and a tension rod nut 4 is connected to the tension rod 5 around the side, and a limit plate 3 is arranged on the side of the tension rod nut 4 adjacent to the jack 1, and a fixing seat 2 is installed on the upper end of the jack 1, and the fixing seat 2 includes a bottom plate 201 and a side plate 202, and a reinforcing plate 203 is installed on one side of the side plate 202, and a plug plate 204 is installed on one side of the bottom plate 201, and a positioning hole 205 is opened at the bottom of the plug plate 204, and the limit plate 3 is sleeved with the tension rod 5, the limit plate 3 is in contact with the tension rod nut 4, and protrusions are provided at both ends of the limit plate 3, and the protrusions of the limit plate 3 are clamped with the fixing seat 2. If the cable is twisted, the protrusions at both ends of the limit plate 3 abut against the fixing seat 2. The friction between the limit plate 3 and the tension rod nut 4 can prevent the tension rod nut 4 from being de-threaded, and the cable from being twisted back. It can also prevent the jack 1 from rotating together due to the twisting back of the cable, causing the jack 1 to leak oil and damage the jack 1.

[0017] See also Figure 1 , Figure 2 , Figure 3 A slot 10 is provided on the side wall of the jack 1, and the fixing seat 2 is limitedly plugged with the slot 10 through the plug plate 204, which is convenient for positioning the fixing seat 2. A limiting slot 6 is provided below the slot 10, and a limiting rod 7 is vertically installed on the bottom side wall of the limiting slot 6. A pressure spring 8 is sleeved around the limiting rod 7, and a latch 9 is slidably sleeved on the limiting rod 7. The latch 9 is positioned and plugged with the positioning hole 205 at the bottom of the plug plate 204 under the pressure of the pressure spring 8, so that the fixing seat 2 is firmly fixed on the jack 1, and this fixing method is simple and quick when removing the fixing seat 2, and the fixing seat 2 can be taken out by pressing the latch 9 downward.

[0018] The anti-retraction jack in the utility model is composed of a jack 1, a fixing seat 2, a limit plate 3, a tension rod nut 4 and a tension rod 5, wherein the fixing seat 2 is composed of a bottom plate 201 and a side plate 202, a reinforcing plate 203 is installed on one side of the side plate 202, and a plug plate 204 is installed on one side of the bottom plate 201, and a positioning hole 205 is opened at the bottom of the plug plate 204;

[0019] The fixing seat 2 is plugged into the slot 10 provided on the outer shell of the jack 1 through the plug plate 204, so as to position the fixing seat 2. Then, the latch 9 in the limit groove 6 is pressed by the pressure spring 8 and is plugged into the positioning hole 205 at the bottom of the plug plate 204, so that the fixing seat 2 is firmly fixed on the jack 1. In addition, this fixing method is simple and quick when removing the fixing seat 2. The fixing seat 2 can be taken out by pressing the latch 9 downward.

[0020] After the fixed seat 2 is fixedly connected to the outer wall of the jack 1 by the plug plate 204, when the jack 1 starts to work, the piston moves upward to press the limit plate 3 and the tension rod nut 4. If the cable is twisted, the protrusions at both ends of the limit plate 3 will resist the fixed seat 2. The friction between the limit plate 3 and the tension rod nut 4 can prevent the tension rod nut 4 from being dethreaded, and the cable from being twisted back. It can also prevent the jack 1 from rotating together due to the twisting back of the cable, causing oil leakage from the jack 1 and damage to the jack 1.

Claims

1. A torsion-proof jack for a bridge cable, comprising a jack (1), characterized in that: The jack (1) is provided with a tension rod (5), the tension rod nut (4) being connected to the periphery of the tension rod (5), a limit plate (3) being provided on the side of the tension rod nut (4) adjacent to the jack (1), a fixing seat (2) being installed on the upper end of the jack (1), the fixing seat (2) comprising a bottom plate (201) and a side plate (202), a reinforcing plate (203) being installed on one side of the side plate (202), an insert plate (204) being installed on one side of the bottom plate (201), and a positioning hole (205) being provided at the bottom of the insert plate (204).

2. The anti-torsion jack for bridge cables according to claim 1 is characterized in that: The limit plate (3) is sleeved with the tension rod (5), the limit plate (3) is in contact with the tension rod nut (4), and protrusions are provided at both ends of the limit plate (3).

3. The anti-torsion jack for bridge cables according to claim 2 is characterized in that: The protruding portion of the limiting plate (3) is clamped with the fixing seat (2).

4. The anti-twist-back jack for bridge cables according to claim 1, characterized in that: A slot (10) is provided on the side wall of the jack (1), and the fixing seat (2) is limitedly plugged into the slot (10) via a plug plate (204).

5. The anti-twist-back jack for bridge cables according to claim 4, characterized in that: A limiting groove (6) is provided below the slot (10), a limiting rod (7) is vertically mounted on the bottom side wall of the limiting groove (6), a pressing spring (8) is sleeved around the limiting rod (7), and a latch (9) is slidably sleeved on the limiting rod (7).

6. The anti-torsion jack for bridge cables according to claim 5, characterized in that: The latch pin (9) is positioned and plugged into the positioning hole (205) at the bottom of the plug plate (204) under the pressure of the pressure spring (8).

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