CN111416305B

CN111416305B - Hydraulic cable cutter

Info

Publication number: CN111416305B
Application number: CN202010244272.1A
Authority: CN
Inventors: 曾庆珠; 陈冰如; 刘梦琪
Original assignee: Nanjing College of Information Technology
Current assignee: Nanjing College of Information Technology
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2021-04-27
Anticipated expiration: 2040-03-31
Also published as: CN111416305A

Abstract

The invention discloses a hydraulic cable cutter, which comprises a support and two groups of propelling devices, wherein each group of propelling devices comprises two propelling devices symmetrically connected to the support, and extension lines of output pistons of the four propelling devices are intersected on a straight line; the output piston of one group of the propelling devices is connected with a cutting knife device, and the output piston of the other group of the propelling devices is connected with a fixing device; the bracket is connected with a prime mover, the prime mover is connected with the propulsion device, the prime mover works to drive the propulsion device to work, the propulsion device drives a cutting knife device or a fixing device to work, the fixing device works to fix a cable, and the cutting knife device peels the cable; the device can be effectively fixed on the cable, so that the cable can be conveniently stripped; two knives in the propelling device simultaneously peel the cable, so that the peeling efficiency is improved.

Description

Hydraulic cable cutter

Technical Field

The invention relates to the technical field of cable maintenance, in particular to a hydraulic cable cutter.

Background

The cable cutter in the prior art mainly has the following defects when the double-layer armored optical cable is stripped. The outer protective layer and the shielding layer of the optical cable are relatively hard, so that the stripping is difficult; secondly, optical cable stripping is mostly single-tool stripping, and is not suitable for occasions with high optical cable stripping efficiency and time for rush repair; thirdly, for different optical cable application occasions, the requirements on the stripping mode or mode of the optical cable are more, and the existing cable cutter only has a one-way function.

Disclosure of Invention

The invention aims to provide a hydraulic cable cutter to solve one of the defects caused by the prior art.

In order to achieve the purpose, the invention is realized by adopting the following technical scheme:

a hydraulic cable cutter comprising: the propulsion device comprises a bracket and two groups of propulsion devices, wherein each group of propulsion device comprises two propulsion devices symmetrically connected to the bracket, and extension lines of output pistons of the four propulsion devices are intersected on a straight line;

the output piston of one group of the propelling devices is connected with a cutting knife device, and the output piston of the other group of the propelling devices is connected with a fixing device;

the cable stripping device is characterized in that a driving device is connected to the support and connected with the pushing device, the driving device works to drive the pushing device to work, the pushing device drives the cutting knife device or the fixing device to work, the fixing device works to fix a cable, and the cutting knife device strips the cable.

Further, the cutting knife device comprises a knife and a rice connecting piece, the knife is connected with the rice connecting piece, and the rice connecting piece is detachably connected with the output piston.

Furthermore, the cutting knife device also comprises a spring and a first base, the first base is connected with the extending end of the output piston, one end of the spring is connected into the extending end of the output piston, and the other end of the spring penetrates through the first base and is connected with the rice connecting piece;

the first base is provided with a meter-shaped groove for fixing a meter connecting piece, and the meter connecting piece is clamped in the meter-shaped groove.

Further, the fixing device comprises a second base and a roller, the second base is connected with the extending end of the output piston, base frames are integrally formed on two sides of the second base, and the roller is rotatably connected between the base frames on the two sides.

Further, the propelling device comprises a hydraulic cylinder, and the output piston is telescopically connected with the hydraulic cylinder.

Further, the periphery of output piston integrated into one piece has the piston to follow the post, set up on the inner wall of pneumatic cylinder along the steel bay of output piston direction of motion, piston is along post sliding connection in the steel bay.

Furthermore, the prime power device is a hydraulic device, the hydraulic device comprises a piston cylinder arranged in the support, a second piston is connected in the piston cylinder, the piston cylinder is provided with an oil outlet, and the oil outlet is communicated with the hydraulic cylinder through an oil pipe;

the second piston movement drives an output piston movement in the hydraulic cylinder through oil in the piston cylinder.

Further, a transmission rod is connected to the second piston and penetrates to the outside of the bracket;

the support is provided with a supporting point, one end part of the lever is connected with the supporting point, and the middle part of the lever is connected with the transfer rod; pressing or lifting the other end of the lever drives the second piston to move.

Furthermore, the hydraulic device further comprises a hydraulic tank arranged inside the support, the hydraulic tank is communicated with the piston cylinder through a first oil pipe and a second oil pipe, a first check valve is arranged in the first oil pipe, a first throttle valve is arranged in the second oil pipe, and a second check valve is connected to the oil pipe of the oil outlet.

Furthermore, an oil way control is arranged between an oil outlet of the hydraulic device and the hydraulic cylinder;

the oil circuit control comprises a second throttling valve and a third throttling valve, and the second throttling valve is used for controlling a propelling device for mounting the knife; the third throttle is used for controlling a propelling device provided with the roller.

According to the technical scheme, the embodiment of the invention at least has the following effects:

1. the cable opening knife provided by the invention is characterized in that two groups of propelling devices are arranged on a support, one group of propelling devices is provided with a knife, the other group of propelling devices is provided with a roller, when the cable opening knife is used, the propelling devices drive the roller to clamp the device on the periphery of a cable, and then the propelling devices drive the knife to move to open the cable; the device can be effectively fixed on the cable, so that the cable can be conveniently stripped; each group of propelling devices in the device comprises two symmetrically arranged propelling devices, and two knives in the propelling devices simultaneously peel the cables, so that the peeling efficiency is improved;

2. the output piston of the propelling device is provided with a first base, the first base is provided with a rice-shaped groove, a knife is arranged on a rice connecting piece, and the rice connecting piece is connected with the rice-shaped groove; the included angle of adjacent grooves in the rice connecting groove is 45 degrees, so that the device can realize the cutting of three angles;

3. the hydraulic device designed by the invention can effectively realize the control of the cutter and the roller, the hydraulic device controls the propelling device to work, the propelling device realizes the fixation and stripping of the cable, and the stripping effect is ensured.

Drawings

FIG. 1 is a top cross-sectional view of the overall structure of an embodiment of the present invention;

FIG. 2 is a schematic view of the connection of the hydraulic cylinder and the bracket according to the embodiment of the present invention;

FIG. 3 is a schematic view of the connection between the roller and the propulsion device in accordance with an embodiment of the present invention;

FIG. 4 is a schematic diagram of the connection of the output piston in an embodiment of the present invention;

FIG. 5 is a schematic view of the knife installation in accordance with an embodiment of the present invention;

FIG. 6 is a schematic view of a rice connector in accordance with an embodiment of the present invention;

FIG. 7 is a schematic diagram of oil circuit control in accordance with an embodiment of the present invention;

wherein: 1. a support; 2. a rotating wheel; 3. a propulsion device; 4. a hydraulic device; 5. controlling an oil way; 6. a roller; 7. a knife; 31. a hydraulic oil inlet; 32. a hydraulic cylinder; 33. an output piston; 331. a piston rim post; 332. a steel trough; 40. a hydraulic tank; 41. a lever; 42. a second piston; 43. a transfer lever; 44. a first check valve; 45. a second one-way valve; 46. a first throttle valve; 47. an oil outlet; 48. a support point; 49. a piston cylinder; 51. a roller hydraulic oil circuit; 52. a third oil pipe; 53. a second throttle valve; 54. a third throttle valve; 55. a fourth throttle valve; 56. a fourth oil pipe; 57. a fifth oil pipe; 58. a sixth oil pipe; 59. a fifth throttle valve; 61. a base frame; 62. a second base; 64. a first stud; 71. a spring; 72. a first base; 73. a groove; 74. a second stud; 75. a rice connector; 76. a spring hole; 77. a screw hole; 78. and a support pillar.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

It should be noted that in the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention but do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. As used in the description of the present invention, the terms "front," "back," "left," "right," "up," "down" and "in" refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

As shown in fig. 1 to 7, a hydraulic cable cutter mainly comprises a bracket 1, a rotating wheel 2, a propelling device 3, a prime mover, an oil path controller 5, a roller 6, a cutter 7 and the like. The prime mover in the invention is a hydraulic device 4, and four propelling devices 3 are pushed to work through the hydraulic device 4. When the propelling device 3 works, firstly, the propelling device 3 drives the roller 6 to move to position the cable; secondly, advancing device 3 drives sword 7 and moves and accomplish the degree of depth and impel, and two gyro wheels 6 of this patent fix a position the cable fixedly, and this patent sets up two sword 7 and opens and shells labour saving and time saving.

The invention can complete the rotation of 0 degree, 90 degrees and 45 degrees through the meter connecting piece 75 by adjusting the angle between the knife 7 and the cable, so that the device has the function of multi-directional stripping. And the scale marks are designed to realize accurate cutting, and finally, the rotating wheel is rotated or pushed and pulled to realize stripping of the optical cable. The invention can finish horizontal, longitudinal and 45-degree spiral stripping of cables, adopts double-cutter design and hydraulic propulsion, and has reasonable design structure and quick and labor-saving operation.

The whole shape of support 1 is the hexagon, and support 1 is inside to be hollow structure, and hexagonal hole is formed in the centre of hexagon support 1, and the cable is then installed in the hexagonal hole. Four propelling devices 3 are arranged on the hexagonal support 1 and divided into two groups, one group is used for mounting the knife 7, and the other group is used for mounting the roller 6. The two propelling devices 3 for installing the knife 7 are symmetrically distributed, and the two propelling devices for installing the roller 6 are symmetrically distributed. The included angle between the four propelling devices 3 is 90 degrees, the output ends of the four propelling devices 3 point to the center of the hexagonal hole, namely, the extension lines of the output ends of the four propelling devices 3 are intersected in the same straight line. The propulsion device 3 is welded or nut-fastened to the support 1 by means of four fixing points 11 on the periphery of the hydraulic cylinder 32. The whole structure of the bracket is reasonable and firm.

A hydraulic device 4 is embedded in one side of a hexagonal column of the support 1, and the hydraulic device 4 mainly comprises a piston cylinder 49, a supporting point 48, a hydraulic oil outlet 47, a first throttle valve 46, a second check valve 45, a first check valve 44, a transmission rod 43, a second piston 42, a lever 41 and the like. The hydraulic oil outlet 47 and the supporting point 48 are arranged at one side of the bracket 1, and the piston cylinder 49 and the hydraulic tank 40 are arranged inside the bracket 1. The piston cylinder 49 is internally connected with the second piston 42, and the oil outlet 47 is communicated with the hydraulic cylinder 32 through an oil pipe. The movement of the second piston 42 causes the movement of the output piston 33 in the hydraulic cylinder 32 by the oil in the piston cylinder 49. A transmission rod 43 is connected to the second piston 42, and the transmission rod 43 penetrates the outside of the bracket 1. One end of the lever 41 is connected to the support point 48, and the middle of the lever 41 is connected to the transmission rod 43; pressing or lifting the other end of the lever 41 moves the second piston 42. And 2 pull rings are connected between the lever 41 and the transmission rod 43, so that the disassembly is convenient, and the operation is simple and reliable. The hydraulic tank 40 is communicated with the piston cylinder 49 through a first oil pipe and a second oil pipe, a first check valve 44 is arranged in the first oil pipe, a first throttle valve 46 is arranged in the second oil pipe, the oil pipe of the oil outlet 47 is connected with a second check valve 45, the oil pipe of the oil outlet 47 is communicated with the second oil pipe, and the oil pipe and the second oil pipe are connected and are used for oil of the hydraulic cylinder 32 to flow back to the hydraulic tank 40.

The transfer rod 43 and the second piston 42 are fixed by means of bolts, the first check valve 44 is responsible for the suction control of hydraulic oil from the piston cylinder 49 in the hydraulic device 4, and the second check valve 45 is responsible for the delivery control of hydraulic oil from the piston cylinder 49. The first throttle 46 is responsible for the return flow control of the propulsion unit hydraulic oil. The hydraulic oil outlet 47 is responsible for providing the input and return flow of hydraulic oil to and from the two pairs of propulsion units. The lever 41 is lifted by the support point 48, the transmission rod 43 drives the second piston 42 to ascend, the first check valve 44 works, the second check valve 45 and the first throttle valve 46 are closed, and hydraulic oil flows from the hydraulic tank 40 to the piston cylinder 49. Pressing down the lever 41, the transmission rod 43 drives the second piston 42 to move downwards, the second one-way valve 45 works, the first one-way valve 44 and the first throttle valve 46 are closed, hydraulic oil flows to the hydraulic oil outlet 47 from the piston cylinder 49 and then flows to the hydraulic cylinder 32, the output piston 33 is pushed to move, the roller 6 or the knife 7 is pushed to move, dense scales are arranged at the top end of the output piston 33, the stripping depth can be focused, and an operator can accurately control the knife-setting depth.

In the present embodiment, the oil passage control 5 is mainly composed of the second throttle 53, the third throttle 54, the fourth throttle 55, the fifth throttle 59, and the fourth oil pipe 56, the fifth oil pipe 57, the third oil pipe 52, and the sixth oil pipe 58. The oil pipe design can be embedded into the bracket 1 for sealing protection.

The oil outlet 47 and a fourth oil pipe 56 are connected with a second throttling valve 53, the oil outlet 47 and a fifth oil pipe 57 control a third throttling valve 54, the third throttling valve 54 controls two roller hydraulic oil paths to realize hydraulic propulsion synchronization, wherein the roller hydraulic oil path 51 is connected with the third throttling valve 54 and a fourth throttling valve 55, and the fourth throttling valve 55 controls one roller hydraulic oil path; the second throttle valve 53 controls two cutter propulsion hydraulic oil paths to realize hydraulic propulsion roller synchronization, wherein the third oil pipe 52 is connected with the second throttle valve 53 and a sixth oil pipe 58, the other end of the sixth oil pipe 58 is connected with a fifth throttle valve 59, and the fifth throttle valve 59 controls one cutter propulsion hydraulic oil path; the propulsion distance synchronization of the symmetrical hydraulic devices is realized.

The second throttle 53 controls the oil outlet 47 to control a pair of knife pushers, and the third throttle 54 controls the oil outlet 47 to control a pair of roller pushers. The fourth throttle valve 55 controls the hydraulic oil input of the parallel second roller propelling device, and the fifth throttle valve 59 controls the hydraulic oil input of the parallel second knife propelling device, so that the problem of hydraulic asynchronism of the propelling devices 1 is solved, and the positioning and cutting of the center line of the cable are facilitated.

When the device is used, the second throttle valve 53 of the propelling device provided with the knife 7 is closed preferentially, the third throttle valve 54 is opened, the propelling device provided with the roller 6 is enabled to complete work, the third throttle valve 54 is closed, the second throttle valve 53 is opened, and the propelling device provided with the knife 7 is enabled to complete corresponding knife setting depth control through a hydraulic device. The hydraulic pressure needs to lift and press the lever 41 many times. After the cutting of the cable is completed, all the throttle valves are opened, the return flow returns to the hydraulic tank 40 through the first throttle valve 46, and the pusher is returned to the position to complete a cutting process.

The propulsion device 3 is composed of a hydraulic oil inlet 31, a hydraulic cylinder 32, an output piston 33 and the like. The hydraulic cylinder 32 is cylindrical, piston edge columns 331 are integrally formed on two sides of the output piston 33, steel grooves 332 are symmetrically formed in the inner side wall of the hydraulic cylinder 32, and the piston edge columns 331 are matched with the steel grooves 332, so that the piston can move up and down, and the piston is prevented from rotating. Hydraulic oil enters the hydraulic cylinder 32 from the hydraulic oil inlet 31, and the hydraulic oil pushes the output piston 33 to move, so that the roller 6 and the knife 7 move. When the first throttle 46 is opened, the hydraulic oil of the hydraulic cylinder 32 flows back to the hydraulic tank 40.

The front end of the roller propelling device is composed of a roller 6, a second base 62, a first stud 64 and the like. The second base 62 is matched with the output piston 33 through a first stud 64, and the roller 6 is fastened with the base frame 61 at two sides of the second base 62 through a shaft, so that the rotation of the roller 6 is realized.

The front end of the knife propulsion device comprises a knife 7, a spring 71, a first base 72, a groove 73, a second stud 74, a rice connector 75, a spring hole 76, a screw hole 77, a support 78 and the like. The knife 7 is fastened in a screw hole 77 of a support 78 through a second stud 74, a rice connecting piece 75 is designed into a rice-shaped column, the top end of the output piston 33 is connected with a first base 72, a rice-shaped groove is formed in the first base 72, a groove 73 is formed in the output piston 33, the rice connecting piece 75 and the first base 72 are sucked together through a spring 71, and the rice-shaped column is matched with the rice-shaped groove formed in the first base 72. Can realize the rotation of 0 degree, 45 degrees and 90 degrees swoves through rotatory rice connecting piece 75, can realize that the cable is horizontal, vertical and 45 spiral shells of opening, utilizes second double-screw bolt 74 and screw 77 coincide, can more change knife 7, and it is simple swift to change the cutter.

Case (2): the cable head is passed through the centre of the holder 1 and the cable or holder is moved to the cutting position. Taking out the lever 41, lifting the lever 41 by using a supporting point 48, driving the transmission rod 43 and the second piston 42 to ascend by the lever 41, working the first check valve 44 in the oil inlet line, closing the second check valve 45 and the first throttle valve 46 at the same time, and flowing hydraulic oil from the hydraulic tank 40 to the piston cylinder 49; pressing the lever 41 drives the transmission rod 43 and the second piston 42 to move downwards, at this time, the second one-way valve 45 works, the first one-way valve 44 and the first throttle valve 46 are closed, hydraulic oil flows to the hydraulic oil outlet 47 through the piston cylinder 49, the second throttle valve 53 is closed, the third throttle valve 54 and the fourth throttle valve 55 work, the hydraulic oil flows to the hydraulic cylinder 32, the output piston 33 is pushed to move, the idler wheels 6 are pushed to move towards the cable, the optical cable is positioned by the two pairs of idler wheels 6, and the optical cable limiting positioning is achieved. Before the knife pushing device works, three modes are selected for stripping the cable, the first mode is transverse stripping, the meter connecting piece 75 is adjusted, the supporting column 78 is pulled by force, the pulling force exceeds the pulling force of the spring 71, the meter connecting piece 75 leaves the first base 72, the knife direction is perpendicular to the cable arrangement direction by rotating the meter connecting piece 75, the knife direction is aligned to the meter-shaped groove in the first base 72, the pulling force is removed, the meter connecting piece 75 is matched with the first base 72 through the spring 71, and the cable routing and the knife direction are perpendicular. The third throttle valve 54 is closed, the second throttle valve 53 and the fifth throttle valve 59 are opened, the lever 41 is lifted and pressed, hydraulic oil pushes the output piston 33 to move, the push knife 7 is pushed to move towards the cable, the two pairs of knives peel the optical cable in a double-knife mode, dense scales are arranged at the top end of the output piston 33, the cutting depth of the knives can be focused, and the aid is provided for operators to accurately control the cutting depth. The two rotating wheels 2 are held by hands and the roller is rotated to realize the double-knife transverse cutting. The second transverse peeling method comprises the steps of adjusting a rice connecting piece 75, pulling a support 78 with force, enabling the pulling force to exceed the pulling force of a spring 71, enabling the rice connecting piece 75 to leave a first base 72, rotating the rice connecting piece 75 to enable a knife direction to be the same as a cable arrangement direction, aligning the knife direction with an empty groove of the first base 72, removing the pulling force, enabling the spring 71 to enable the rice connecting piece 75 to be matched with the first base 72, enabling cable routing and the knife direction to be the same, closing a third throttle valve 54, opening a second throttle valve 53 and a fifth throttle valve 59, lifting a lever 41, enabling hydraulic oil to push an output piston 33 to move, pushing a knife 7 to move towards a cable, enabling two pairs of knives to peel double knives of the optical cable, arranging dense scales at the top end of an output piston 33, paying attention to the cutting depth of the knife. The two rotating wheels 2 are held by hands and the bracket is pushed and pulled, so that double-blade longitudinal cutting is realized. The third 45-degree spiral stripping is carried out, the rice connecting piece 75 is adjusted, the supporting column 78 is pulled by force, the pulling force exceeds the pulling force of the spring 71, the rice connecting piece 75 leaves the first base 72, the rice connecting piece 75 is rotated to enable the knife direction to form a 45-degree included angle with the direction of the cable, the knife direction is aligned with the empty groove of the first base 72, the pulling force is removed, the spring 71 enables the rice connecting piece 75 to be matched with the first base 72, the cable routing and the knife direction are 45 degrees, the third throttle valve 54 is closed, the second throttle valve 53 and the fifth throttle valve 59 are opened, the lever 41 is lifted and pressed, hydraulic oil pushes the output piston 33 to move, the knife is pushed to move towards the cable, the two pairs of knives strip the double knives, dense scales are arranged at the top end of the output piston 33, the cutting depth of. Two runners 2 are held by hands and rotated, and the bracket pushes the cable and the knife to an included angle, so that double-knife 45-degree spiral cutting is realized. The lever 41 needs to be lifted and pressed for many times in hydraulic pressure, the lower cutter depth of the propelling device is propelled for many times, the idler wheel 6 is rotated again, the cable is cut for many times, and the stripping quality of the cable is improved. After the cutting of the cable is completed, all the throttle valves are opened, the hydraulic oil returns to the hydraulic tank 40 through the first throttle valve 46, and the propelling device returns to the original position to complete a cutting process.

It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.

Claims

1. A hydraulic cable cutter is characterized by comprising: the device comprises a support (1) and two groups of propelling devices (3), wherein each group of propelling devices (3) comprises two propelling devices (3) symmetrically connected to the support (1), and extension lines of output pistons (33) of the four propelling devices (3) are intersected on the same straight line;

wherein the output piston (33) of one group of the propelling devices (3) is connected with a cutting knife device, and the output piston (33) of the other group of the propelling devices (3) is connected with a fixing device;

the device is characterized in that a prime mover is connected to the bracket (1), the prime mover is connected with the propulsion device (3), the propulsion device works to drive the propulsion device (3) to work, the propulsion device (3) drives a cutting knife device or a fixing device to work, the fixing device works to fix a cable, and the cutting knife device peels the cable; the cutting knife device comprises a knife (7) and a rice connecting piece (75), the knife (7) is connected with the rice connecting piece (75), and the rice connecting piece (75) is detachably connected with the output piston (33);

the cutting knife device further comprises a spring (71) and a first base (72), the first base (72) is connected to the extending end of the output piston (33), one end of the spring (71) is connected to the extending end of the output piston (33), and the other end of the spring penetrates through the first base (72) and is connected with the rice connecting piece (75);

the first base (72) is provided with a rice-shaped groove for fixing a rice connecting piece (75), and the rice connecting piece (75) is clamped in the rice-shaped groove.

2. The hydraulic cable cutter according to claim 1, wherein the fixing device comprises a second base (62) and a roller (6), the second base (62) is connected with the protruding end of the output piston (33), a base frame (61) is integrally formed on two sides of the second base (62), and the roller (6) is rotatably connected between the base frames (61) on the two sides.

3. Hydraulic cable opener according to claim 2, characterized in that the propulsion device (3) comprises a hydraulic cylinder (32), the output piston (33) being telescopically connected to the hydraulic cylinder (32).

4. The hydraulic cable cutter according to claim 3, wherein a piston edge column (331) is integrally formed on the outer periphery of the output piston (33), a steel groove (332) along the movement direction of the output piston (33) is formed in the inner wall of the hydraulic cylinder (32), and the piston edge column (331) is slidably connected in the steel groove (332).

5. The hydraulic cable cutter according to claim 3, wherein the prime mover is a hydraulic device (4), the hydraulic device (4) comprises a piston cylinder (49) arranged inside the bracket (1), a second piston (42) is connected in the piston cylinder (49), the piston cylinder (49) is provided with an oil outlet (47), and the oil outlet (47) is communicated with the hydraulic cylinder (32) through an oil pipe;

the second piston (42) movement drives the output piston (33) in the hydraulic cylinder (32) by oil in the piston cylinder (49).

6. The hydraulic cable opening knife according to claim 5, characterized in that a transmission rod (43) is connected to the second piston (42), and the transmission rod (43) penetrates to the outside of the bracket (1);

a supporting point (48) is arranged on the bracket (1), one end part of the lever (41) is connected with the supporting point (48), and the middle part of the lever (41) is connected with the transmission rod (43); pressing or lifting the other end of the lever (41) drives the second piston (42) to move.

7. The hydraulic cable cutter according to claim 5, wherein the hydraulic device (4) further comprises a hydraulic tank (40) arranged inside the bracket (1), the hydraulic tank (40) and the piston cylinder (49) are communicated through a first oil pipe and a second oil pipe, a first check valve (44) is arranged in the first oil pipe, a first throttle valve (46) is arranged in the second oil pipe, and a second check valve (45) is connected to an oil pipe of the oil outlet (47).

8. The hydraulic cable cutter according to claim 5, characterized in that an oil path control (5) is arranged between an oil outlet (47) of the hydraulic device and the hydraulic cylinder (32);

the oil circuit control (5) comprises a second throttle valve (53) and a third throttle valve (54), and the second throttle valve (53) is used for controlling a propelling device (3) for installing the knife (7); the third throttle valve (54) is used for controlling the propulsion device (3) for mounting the roller (6).