RU2397062C1 - Pincers for squeezing of tubes - Google Patents

Abstract

FIELD: technological processes.

SUBSTANCE: invention relates to hand tools, namely to devices for squeezing of metal hollow parts. In proposed pincers one of handles is arranged as a whole with body, and the other one is arranged as rotary and is connected to body hingedly, at the same time pincers are equipped with two connecting rods and one yoke connected hingedly by one axis, besides one connecting rod with its second end is connected hingedly to pusher, the other connecting rod is hingedly connected with its second end to rotary handle, and yoke with the second end is connected hingedly to body.

EFFECT: invention provides for required force of tube squeezing in hard-to-access space with small angle of maximum opening of pincers handles.

3 cl, 8 dwg

Description

The invention relates to mechanical engineering, in particular to a device for clamping hollow parts, including metal tubes, for example aluminum, to ensure the deformation of the cross section of the tubes to the full contact of opposite points.

The inventive pincers, in particular, are designed for clamping process tubes filled with a gaseous medium under atmospheric pressure and connecting a plurality of synchronously working products to a common collector. The clamping of such tubes is necessary in order to isolate a failed product from the collector, including if the valves do not provide the necessary tightness upon actuation. In this case, the pinch prevents the leakage of the gas medium pumped through the tubes.

This is also necessary if the failure of at least one product from the group affects the work of many. Then there is the danger of not only leakage of the gas medium through the destroyed product, but also the danger of disrupting the operating parameters of the process as a whole, and stopping and resuming the operation of the entire technological system requires a lot of labor.

A device for crimping and sealing, containing lever pincers and located between their jaws spring element with a loop, the ends of which are fixed to the respective jaws [1].

The known device is suitable for crimping and sealing bundles of fibers, for example, wires, but it is not suitable for pinching (flattening) tubes filled with a working gas medium due to the fact that the compressive forces of the device are insufficient to deform the above tubes.

Known locking pliers [2] with axial clamping action, comprising a housing, a sponge, fixed relative to the body, a movable sponge, pivotally attached to the body, a work handle rotatably attached to the movable sponge, while the sponges are fixed with clamping elements that are in the closed position ticks are adjacent to each other, and the elongation of the movable jaw is installed with the possibility of sliding along the elongation of the fixed jaw towards the closing of the clamping elements.

Known locking pliers allow two parts to be pressed together before welding or during welding. However, they cannot be used to pinch tubes with a working gas medium.

A disadvantage of the known ticks is a small working force, insufficient for pinching (flattening) the tube for a tight closure of its walls, ensuring a tight place for the separation of the two formed cavity of the tube.

Known pliers [3] for crimping aluminum or copper conductors in sleeves (tips), containing a housing with a sponge, a pusher placed opposite the sponge in the housing bore, two working handles, nozzles mounted one on the housing sponge, the other on the pusher opposite the first, two working handles pivotally connected by parallel axes to the pusher, and each with its own rod, each rod being pivotally connected to the housing.

Although the known pincers allow you to create the force necessary for pinching the tubes, however, before performing the pinch to cover the tube with the nozzles of the pincers, it is necessary to spread the pens of the pincers 180 degrees apart between them. When pinching the handle tubes from the initial position before pinching, in which they are directed in opposite directions, it is necessary to turn them until they are compressed, i.e. 90 degrees each.

To work with such mites, a large space is needed.

And in the case of a small space, for example, in the case of clamping of technological tubes connecting a large number of products in a space limited by adjacent products, collectors, tubes, control devices and other technical means, the use of these mites is impossible due to their dimensions due to the large angle of rotation of the handles .

The task was to create such mites that would provide the necessary effort to compress the tube in a small space with an angle of maximum dilution of the handles of not more than 40 degrees.

The problem is solved in that the known pincers containing a body with a sponge, a pusher placed opposite the sponge in the body bore, two working handles and two nozzles fixed one on the body sponge, the other on the push rod opposite the first one, one of the handles is integral with the body, and the other is rotatable and pivotally connected to the housing, while the pincers are provided with two connecting rods and one beam, pivotally connected by one axis, with one connecting rod pivotally connected to the pusher with the other end, and the other connecting rod pivotally connected the second end with a rotary handle, and the rocker with the second end pivotally connected to the body, while the working surfaces of the nozzles are rounded along the entire length equal to the largest width of the tube squeezed to flattening, one of the nozzles is made with protrusions whose height is not more than the minimum thickness of the two walls of the compressible tube, and the other nozzle is made with stops lying in one plane with the protruding part of the surface of the nozzle, pinching the tube, and located opposite the protrusions of the first nozzle.

When the movable handle is rotated around an axis fixed in the housing, the handle acts through the axis on the connecting rod, which, in turn, acts on the second connecting rod and rocker via a common axis (see Figs. 7, 8).

The force of action of the jaws on the compressible product P ₃ depends on the L / 1 ratio of the movable handle and on the angle “a” between the axis of the pusher and the direction of the connecting rod connected to the pusher:

P3 = (P1L / 1) / 2sin <a>

With an angle <a> equal to 3 ... 4 degrees, the compressive force can reach several thousand kilograms and this is quite enough for pinching aluminum tubes with a diameter of 10-12 mm with a wall thickness of up to 2 mm.

The design of the claimed ticks is presented in the drawings:

Figure 1 - section of ticks along the axis; ticks are depicted in the open position, the initial one before pinching the tube;

In Fig.2 - also with compressed handles and a clamped tube

Figure 3 is a section aa taken in figure 1;

Figure 4 is a section bB made in figure 1

Figure 5 - section bb, made in figure 1;

In Fig.6 is a section GG made in Fig.2;

7 is a kinematic diagram of ticks in the open state;

On Fig - kinematic diagram of ticks after compression of the tube.

The pliers consist of a housing 1 with a fixed handle 2, a rotary handle 3, pivotally attached to the housing 1 using an axis 4, a fixed nozzle 5 and a movable nozzle 6. In the cylindrical bore 7 of the housing 1 there is a pusher 8 on which the movable nozzle 6 is fixed with a pin 9 .

An ear 10 is made at the opposite end of the pusher, to which a connecting rod 12 is pivotally connected via an axis 11. A beam 14 is mounted on the ear 13 of the housing 1, connected by an axis 15 to the connecting rod 12.

Using the same axis, the connecting rod 12 and the beam 14 by means of the connecting rod 16 and the axis 17 are connected to the movable handle 3. The fixed nozzle 5 is fixed to the protrusion 18 of the housing 1 with the help of a pin 19.

The fixed handle 3, the emphasis 13 and the ear 20 are fixed to the housing 1 with pins 21, and the emphasis 13 and the ear 20 are made in one piece. It is possible to execute the housing 1 as a whole with the fixed handle 2, the stop 13 and the ear 20. To reduce the required compression force of the tube, the working surfaces 22 and 23 of the nozzles 5 and 6 are rounded along their entire length (see Fig. 6), which is equal to the largest the width of the tube pinched to flatten.

When clamping tubes made of soft material, for example aluminum tubes, in order to avoid through-wall clamping of the tube wall, one of the nozzles is made with protrusions 24, the height of which is not more than the minimum thickness of the two walls of the compressible tube, and the other is equipped with stops 25 lying in one plane <б> with a protruding pinch surface, and is located opposite the protrusions 24 of another nozzle.

Pinch tubes of the inventive tool can be carried out as follows.

At the beginning, the handles 2 and 3 are bred, and with them the nozzles 5 and 6 of the ticks are bred to the required size. Then, pliers are installed on the tube to be pinched so that the tube is between the nozzles 5 and 6. When the handles are compressed, the movable handle 3 acts through the axis 17 on the connecting rod 16, which acts through the axis 15 on the beam 14 and the connecting rod 12.

The latter moves the pusher 8 in the direction of the fixed nozzle 5. At the beginning of the movement, when the angle between the beam 14 and the connecting rod 12 is small (up to 90 degrees), the resistance of the deformation tube is small, and the speed is maximum.

As the tube contracts, its resistance increases. At the same time, the angle <a> between the beam 14 and the connecting rod 12 increases to almost 175 degrees, which, without increasing the effort on the handles, makes it possible to obtain the necessary force for pinching the tube section. The extreme position of the movable handle 3 is determined by the protrusion of the stop 13, which rests on the connecting rod 12.

After the tube is clamped, the tick handles part and the ticks are removed from the tube.

A positive effect from the use of the inventive device is expressed in achieving the ability to pinch the process tubes in hard to reach places without stopping the process, i.e. in those places where it is impossible to raise the tick handles at an angle exceeding 40 degrees.

With a small angle of rotation of the movable handle (within 30 ... 35 degrees), it is possible to obtain a sufficient stroke of the movable jaw necessary for joining the opposite points of the tube wall while providing the necessary force for pinching the tube.

The ability to perform work with pincers of the claimed design when clamping the technological tubes of the existing equipment allows you to get a significant economic effect due to the exclusion of the cost of stopping the equipment. Ease of use of the claimed pincers is that the working stroke of the handles is small, and the force required to clamp the tubes is provided with a relatively small force on the handles (up to thirty kilograms).

Information sources

1. Patent No. 2025266. Crimp device, publ. 12/30/1994

2. Patent No. 2113976 C1. Locking pliers with axial clamping action (options), publ. 05/27/1998

3. TU 36-872-79. "Press tongs" type PK-3. NPO "Electric installation". Passport.

Claims (3)

1. Pincers for clamping the tubes, comprising a housing with a sponge, a pusher located opposite the sponge in the housing bore, two working handles and two nozzles, one of which is mounted on the housing sponge and the other on the pusher opposite the first, characterized in that they are equipped with two connecting rods and one rocker, pivotally connected by one axis, one of the working arms is integral with the housing, and the other is rotary and connected to the housing articulated, one of the connecting rods with the second end pivotally connected to the pivot, the second connecting rod pivotally connected n the second end with a rotary handle, and the rocker the second end is pivotally connected to the housing. 2. The pliers according to claim 1, characterized in that the working surfaces of the nozzles are made rounded along their entire length, equal to the largest width pinched to flatten the tube. 3. Pliers according to one of claims 1 and 2, characterized in that one of the nozzles is made with protrusions whose height is not more than the minimum thickness of the two walls of the pinch tube, and the other nozzle is made with stops lying in the same plane as the protruding part of the nozzle surface pinching the tube located opposite the protrusions of the first nozzle.

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