Cutting pliers

FIELD: plastic working of metals, possibly cutting shaped, rod materials, tubes.

SUBSTANCE: cutting pliers include hydraulic cylinder with rod and body, control unit, two levers having common rotation pivot rigidly joined with body of hydraulic cylinder, cutters with cutting edges secured to free ends of levers whose opposite ends are jointly coupled with rod of hydraulic cylinder. Said cutters are detachable, lengthwise and crosswise ones. Lengthwise cutters have pointing angle α in range 55 - 65° and they are arranged according to condition providing opening angle of edges β at closing lengthwise cutters along outer end in range 15 - 25°. Crosswise cutters have pointing angle less by 5 - 10° of pointing angle of lengthwise cutters.

EFFECT: enhanced efficiency of safe cutting of metallic rods, reinforcing members and so on, increased wear resistance of cutting members.

4 dwg

 

The present invention relates to the processing of metals by pressure and can be used when cutting profile, bars, tubes and various designs of metal when conducting rescue operations and liquidation of consequences of emergency situations (ES).

In the Federal Republic of Germany patent No. 2621249, class. And 62 In 37/00, 1978 known portable device with hydraulic drive, containing two levers pivotally connected to the housing of the cylinder, on one arm of levers mounted working bodies in the form of expanding sponges, other arms of the levers are made with toothed sectors located interoperable with the rack on the piston rod of the hydraulic cylinder.

The disadvantages of this apparatus are insufficient reliability, and low technological capabilities.

It is also known a device with hydraulic drive, containing two levers, one shoulders pivotally mounted on the body of the cylinder is symmetrical about its axis of symmetry, and working bodies in the form of expanding jaws mounted on the free arms of the levers, while the piston rod of the power cylinder pivotally connected with each of the levers by means of corresponding parts (the Federal Republic of Germany patent No. 2319276 And 62 In 37/00, 1977). The disadvantages of this device is that obtaining the necessary decompresses efforts to determine the hinnon interval disclosure levers with decompresses sponges requires application to the stock much effort.

A prototype of the proposed solution are scissors universal portable by RF patent No. 02116872 from 10.08.98, class B 23 D 17/00. They consist of a cylinder, two levers carrying the cutting knives, and on the outer surface of the locking teeth, and a control unit, hydraulic cylinder, and the knives are aligned on the levers with the possibility of a counter-rotary motion, each of the knives made in the form of a triangular plate and has a base, the front face to the rear plane of the knife - rear face, the front and rear faces intersecting at an acute angle to form a cutting edge having a cutting cavity, and the same number of teeth, formed by the intersection of cylindrical surfaces.

However, these scissors cannot be used for cutting rods and pipes of considerable diameter, the relative sizes of the elements of the cutting edges are not defined, and the configuration of the cutting elements (edges), formed by the intersection of cylindrical surfaces, is not optimal because it does not provide reliable cutting metal rods and pipes.

The closest analogue of the present invention is a portable hydraulic tool according to the patent of Russian Federation №2095235, 26 D 15/00. It is used mainly for cutting electrical wires.

The tool contains a plunger pump, issue nanny of two sections and spacers between them, and cutter body made in the form of separate units, connected by a tubular rod containing at least two parts. In the wall of the cylinder housing of the cutting body fitting, designed for connection with a flexible hose with the fitting of the second section of a plunger pump. The plunger pump is pivotally connected to the handles located in the same plane, perpendicular to the plane of cutting. The rod is made of a dielectric material. The liquid used in the tool selected dielectric.

The disadvantages of this tool is that the cutting element in the form of one knife has a one-way move, and that is not defined, the configuration of the cutting edges of the knives and their location in space.

The technical result of the invention of "Cutters", consisting of

cylinder, a control unit, two levers having a common axis of rotation, is rigidly connected to the housing of the hydraulic cylinder, cutters mounted on the free ends of the levers, the opposite ends of which are pivotally connected with the rod of the hydraulic cylinder is increased efficiency, safe cutting of metal rods, valves, etc., as well as increasing the wear resistance cutters. This goal is achieved due to the fact that the cutters are removable, longitudinal and transverse, thus the longitudinal cutters are made with an angle of taper α=55°...65° and set out the conditions for obtaining the angle of their cutting edges β the gnashing of longitudinal cutters on the outer end of 15...25°and transverse cutters are made with an angle of taper less for 5...10° the angle of taper of the longitudinal cutters.

On 1 shows a longitudinal section of the cutter, with divorced cutters, figure 2 shows the form And on the outside of a regulatory mechanism, figure 3 - position, when the cutters are summarized on figure 4 indicated the angle of taper α.

Cutters are designed for cutting reinforcement steel, steel bars, nuts threaded connections and other structural elements when conducting rescue operations in the areas of emergency incidents, accidents, catastrophes, fires, natural disasters (landslides, earthquakes, landslides and other), as well as construction and dismantling works in various industries.

The pliers include two cutter 1, mounted on the free ends of the levers 2, pivotally connected with the tubular body 3, which is connected to the housing of the power cylinder 4. Shoulders arms 2 through earrings 5 and axis 6 pivotally connected with the rod of a cylinder.

Supply of working fluid to the power cylinder through Bolotnikova the control unit, which is associated with two flexible sleeves 7 and 8 with quick polurethane 9.

In the middle position of the valve, when the control ring 10 with its pointer 11 is opposite the symbol "0", the working fluid coming from the pump under pressure to the sleeve 7, freely drained through the valve, and piston cavity of a cylinder and the discharge sleeve 8 in the tank. When this rod cylinder chamber is locked by the slide valve and the movement of the knives is not happening.

By turning the ring 10 to align the pointer 11 symbol 12 fluid pressure through the sleeve 7 and the spool enters the piston cavity of the cylinder. The rod moves through earrings 5 turning the levers 2, the cutters 1 closer, biting in between the bars.

By turning the ring 10 to match the pointer 11 with symbol 13 working fluid pressure through the sleeve 7 and the spool enters the rod of the cylinder chamber. The rod moves through earrings 5 turning the levers 2, the cutters apart.

In these three positions of the control ring 10 is fixed ball lock.

The cylinder of the clipper is equipped with a safety valve, which eliminates the possibility of increasing the pressure in the rod end above specified, in the event of disconnection of the quick connect drain line when running the pump station.

The handle 14 is rednaznachena to protect the sleeves 7 and 8 from excessive kinking, and also (together with arm 15) for carrying pliers and ease of manipulation at work.

Cutters 1 - detachable, they are installed and fixed to the levers by means of screws 16. The angle of taper cutters and within 55-65° selected experimentally based on their maximum durability and efficiency of the cutting process (cutting), which is quick and one-time impact of the cut rod. It was found that when using cutters with corner α less 55°, the cutting efficiency is sharply reduced, and when the α>65° dramatically increases the wear of the incisor teeth.

When the cutting bars of the longitudinal cutters embedded in the metal, pushing it, and in front of the cutters is uneven compaction of metal, especially located in layers in front of the cutters, fully exhausts the stock of ductility and becomes brittle as glass. These phenomena are well described in the multi-volume edition of "Destruction", the World, 1971-1980, and, for example, in the book His "Methods and means of field definitions of strain and stress". M: mechanical engineering, 1983, this implies that there is no need to completely cut the rod when cutting, because after the introduction of cutters on 60-70% of the total thickness of the rod then he collapses on the cutting line. All this was also confirmed by the results from the Atami performed experiments. These phenomena lead to the fact that when cutting the rod of his half scatter in different directions. In addition, emerging forces push rod from beneath the cutters in the outer side, which impairs the cutting conditions and lead to rapid zatupleniju tool.

To avoid these negative phenomena allows a certain location of the cutters shown in figure 3, when they are reduced. In this position the cutting edges of the cutters are angled βthat hinders the movement of the cut rod, because he is in a confined space. The result is improved cutting conditions, are provided with safety requirements, increases the efficiency of the process.

It was established experimentally that these positive effects are most pronounced when the β=15-25°. When β<15° positive processes practically does not occur, and when β>25° because of the complicated kinematics of the movement of incisors lost the benefits of this scheme.

As already noted, it is found experimentally that the angle of taper α the top of the cutter must lie in the range 55-65°. When α<55° cutting edge quickly Satupaitea. And when α>65° worsening dramatically cutting conditions.

The proposed layout of the longitudinal cutters gives another significant p is a positive effect: the cutters, width N 1.25 times smaller than the diameter D snack bar, ensure sustainable and efficient cutting process.

Increase the width of the N incisors 1.25 times would result in a corresponding increase of the sizes of all other elements of the clipper, and increase their size and weight.

Cross cutters are designed for cutting nuts and other fittings, i.e. objects that are not solid fill volumes of metal. It is found experimentally that for lateral incisors to the angle of taper α1should be 5-10° less than the angle of taper of the longitudinal cutters and make 45-55°.

According to the proposed scheme created cutter, longitudinal cutters have α=60°, β=20°N=26 mm; cross - α=50°N=26 mm

Technical characteristics of the clipper. The force on the cutters k H - 170 to 270. The greatest diameter of the snack bar D mm - 32. The working fluid is oil AMG - 10 GOST 6794 - 75 or MGE - 10A OST 38.01281 - 82. Weight, kg to 12.5. Dimensions, mm 785 X 200. The relation

The pliers are made and have been thoroughly tested, which confirmed all of the above provisions and calculations.

Pliers, containing the cylinder with the rod and the housing, a control unit, two levers having rigidly connected with the housing of the hydraulic cylinder common axis of rotation, the cutters with cutting to what akami, mounted on the free ends of the levers, the opposite ends of which are pivotally connected with the piston rod of the hydraulic cylinder, characterized in that the cutters are removable, longitudinal and transverse, with longitudinal cutters are made with an angle of taper α=55...65° and set out the conditions for obtaining the angle of their cutting edges β the gnashing of longitudinal cutters on the outer end of 15...25°and transverse cutters are made with an angle of taper less for 5...10° the angle of taper of the longitudinal cutters.



 

Same patents:

FIELD: plastic working of metals, possibly cutting sheet, shaped and rod materials.

SUBSTANCE: combination type shears include hydraulic cylinder with control unit; two levers having cutters with cutting edges and mounted with possibility of rotation one towards other in common axle. Cutting edges have cutting teeth. Fixing teeth are formed on outer surface of lever ends. Length of cutting edges consists at least of 0.6 of level length. Cutting edges are tapered one to other by angle 40 - 50° relative to cutting line. Cutting teeth have pitch Z = 5 - 8 mm, thickness l1 = (0.2 - 0.25)Z, height h = (0.25 - 035)Z and width of initial land l = 0.8 -1.0 mm. Each tooth is tapered by angle α = 60 - 80° to side of lever rotation axis and it is sharpened by angle β = 25 - 35°. Fixing teeth have pitch 3 - 5 mm, depth 1.0 - 3.0 mm and inclination angle 60 - 80° to side of lever rotation axis. In variant levers end portions are tapered on their outer surface along length of 4 - 10 teeth by angle α1 = 20 - 40°. On inner surface of levers before cutting teeth smooth supporting surface with width 20 - 40 mm is formed.

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2 cl, 4 dwg

FIELD: plastic working of metals, possibly cutting sheet, shaped and rod materials, tubes.

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5 dwg, 1 ex

Sapper's shears // 2286232

FIELD: hand tools for cutting round, square, hexahedral and other metal shapes; removal of barriers on emergency objects; cutting reinforcement in construction engineering.

SUBSTANCE: proposed shears have pair of powerful levers with holes located symmetrically relative to their center of turn where pair of identical cutting knives are placed; knives have slots for item to be cut and holes for pins of load-bearing articulations. Holes for pins of load-bearing articulations are located on plane of each cutting knife over longitudinal axis symmetrically relative to transversal axis; two holes are made in form of slots (every other hole) oriented perpendicularly relative to common axis of holes. One cutting knife of pair is laid on other one by reverse side, so that holes of one cutting knife of pair is laid on slots of other one.

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3 cl, 5 dwg, 1 ex

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FIELD: repairing and building works, mounting-dismounting operations and rescue works.

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SUBSTANCE: combination type shears include hydraulic cylinder with control unit; two levers having cutters with cutting edges and mounted with possibility of rotation one towards other in common axle. Cutting edges have cutting teeth. Fixing teeth are formed on outer surface of lever ends. Length of cutting edges consists at least of 0.6 of level length. Cutting edges are tapered one to other by angle 40 - 50° relative to cutting line. Cutting teeth have pitch Z = 5 - 8 mm, thickness l1 = (0.2 - 0.25)Z, height h = (0.25 - 035)Z and width of initial land l = 0.8 -1.0 mm. Each tooth is tapered by angle α = 60 - 80° to side of lever rotation axis and it is sharpened by angle β = 25 - 35°. Fixing teeth have pitch 3 - 5 mm, depth 1.0 - 3.0 mm and inclination angle 60 - 80° to side of lever rotation axis. In variant levers end portions are tapered on their outer surface along length of 4 - 10 teeth by angle α1 = 20 - 40°. On inner surface of levers before cutting teeth smooth supporting surface with width 20 - 40 mm is formed.

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FIELD: equipment used, mainly at extreme condition for cutting reinforcement.

SUBSTANCE: device includes cylinder with openings for releasing gas, piston with rod and actuating mechanism. Device is provided with sleeve mounted in cylinder with possibility of axial motion. Said sleeve has mass less than common mass of piston with rod and of actuating mechanism. Sleeve is mounted with possibility of placing piston with rod inside it and it has grooves whose length exceeds height of piston. In bottom of sleeve there are openings that may be matched with gas releasing openings of cylinder.

EFFECT: increased useful life period, lowered mass of device.

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FIELD: equipment used, mainly at extreme condition for cutting reinforcement.

SUBSTANCE: device includes piston with rod arranged in cylinder with possibility of operating by action of gas pressure source; actuating mechanism in the form of stationary and movable cutters. Device also includes yoke rigidly joined to cylinder and having groove for placing eccentric insert in it; rocking bar mounted with possibility of motion along yoke. Movable and stationary cutters are mounted on yoke. Movable cutter has one end jointly mounted in rod of piston and other end jointly mounted by means of said eccentric insert in rocking bar.

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4 dwg

FIELD: plastic working of metals, possibly cutting sheet, shaped and rod materials, tubes.

SUBSTANCE: cutting blade includes hydraulic cylinder, control unit, two cutters mounted with possibility of rotation one towards other in common axle and having shaped cutting edges. Each cutting edge has cutting band tapered by angle 2 - 4° and having width consisting of 8 - 10% of cutter thickness and slope adjacent to said band and formed along remaining thickness of cutter. Each cutting edge has two crescent like cutouts mutually joined through bridge consisting of 10 - 20% of cutter thickness. Radius of inner crescent like cutout consists of 20 - 30% of radius of outer crescent like cutout. Cutting edge in crescent like cutouts is tapered by angle 40 - 50° and in bridge it is tapered by angle 50 - 56°.

EFFECT: enhanced efficiency of cutting due to distributing cutting edge for two crescent-like cutouts and due to using optimum configuration of cutting edge.

5 dwg, 1 ex

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