SU1053932A1 - Apparatus for crimp connection of hose end with nipple - Google Patents

Abstract

1. A DEVICE FOR CONNECTING A BENDED END OF A 10 5 NIPPEL HOSE, containing coaxially mounted guide bush with leaves, a mandrel to limit the deformation of the inner surface of the nipple, connected to the mandrel and between each other a hydrocylide, with a piston with a cone crimp sheer body located between them and an auxiliary hydraulic cylinder, characterized in that, in order to increase productivity, the mandrel is spring-loaded relative to the piston of the power hydraulic cylinder and is associated with it by means of a collet lock with fur ism of its disclosure. 2. A device according to claim 1, characterized in that a channel is made in the wall of the auxiliary hydraulic cylinder for draining the liquid from its over-piston cavity. with @ (L ate with so by sou Yu 1E 11. 20 18

Description

This invention relates to the joining of parts of a product to one another by a pressure treatment method. A known device for crimping fittings at the ends of the hoses, including an axially mounted collet chuck, a mandrel to limit the deformation of the nipple, a main hydraulic cylinder with a power element provided with a tapered crimp surface, and an auxiliary hydraulic cylinder connected to the mandrel. To supply and retract the power torque, it is necessary to apply the working pressure to the rod end of the power cylinder. A separate auxiliary hydraulic cylinder is used to install and remove the mandrel. To control the power and auxiliary hydraulic cylinders, two independently controlled hydraulic distributors 1 are used. However, such devices have a complex configuration, do not provide high performance in mass production of terminations at the ends of hoses and high quality crimping, require a large number of regulators, hydraulic equipment and a time relay to ensure control the process of reduction with simultaneous removal of the mandrel. It is well known that much less effort is required to retract a stamp than to crimp a seal in the process of axial advancement of a stamp. However, the volume of the hydraulic cavity used in the removal of the power element is equal to the volume of the cavity used in the thrust, which is not advisable, since the speed of removal of the stamp with the same performance of the Pump is equal to the speed of the supply of the stamp. This reduces the performance of the device. From a safety point of view, the device has drawbacks, since an unprotected external main hydraulic cylinder is reciprocating in the process of crimping the seals of the rods. The supply of working fluid to the power cylinder is carried out only with the help of flexible pipes or high pressure hoses, which reduces the reliability of the installation as a whole. The simultaneous operation of both power and auxiliary hydraulic cylinders, which are kinematically unrelated and therefore controlled by separate hydraulic distributors, increases the cycle time and fatigues the operator. It is also known to crimp the end of a hose with a nipple, comprising a mounted guide bush with lobes, a mandrel to restrict the deformation of the nipple, connected to each other and to the mandrel, a main single-liter hydraulic cylinder with a power piston with a tapered crimp surface and an auxiliary hydraulic cylinder. The design of the device ensures operation from one hydrodistributor (for crimping and withdrawal of the mandrel) and with installation to the initial position at the command of the operator or driver. The removal of the power element is carried out faster than the forward stroke, as it is carried out by the auxiliary hydraulic cylinder having several times smaller volumes of cavities than the working cavity of the power hydraulic cylinder. The device has no external moving parts. This results in greater productivity in the production of fittings at the ends of the hoses, facilitates the work of the operators and increases the safety of operation of the installation 2. The disadvantage of this device is the need to perform a special operation to return the mandrel to its original position, which requires additional time in the cycle of connecting the hoses nipple. In addition, the presence between the piston of the auxiliary hydraulic cylinder and the mandrel, as well as between the piston of the main hydraulic cylinder and the piston bushing of the auxiliary hydraulic cylinder, axial clearances complicates the design, reduces the rigidity of the power section of the device, and increases the time of the SDI embedment cycle. The purpose of the invention is to increase productivity. The goal is achieved by the fact that in a device for crimping the end of a hose with a nipple, containing a coaxially mounted guide sleeve with petals, a mandrel to limit the deformation of the inner surface of the nipple, connected to each other and with the mandrel, a power cylinder, in the cavity of which a piston is placed a cone crimping surface, and an auxiliary hydraulic cylinder, the mandrel is spring-loaded relative to the piston of the power hydrocyl-indra and connected with it by means of a collet lock with its opening mechanism. A channel is made in the wall of the auxiliary hydraulic cylinder for draining the liquid from its piston cavity. FIG. 1 shows the device, a general view; in fig. 2 and 3 are variants of the connections of the mandrel with the piston of the hydraulic cylinder with a collet lock and a return spring. The device for crimping the ends 1 of the hoses 2 when fixing the nipples 3 in them is designed as a guide sleeve 4 with petals 5. To limit the deformation of the inner surface of the nipple 3, the mandrel 6 is located in it. The device contains two hydraulic cylinders installed in series, one of which is power cylinder 7, the other - auxiliary cylinder 8. The piston 9 of the power cylinder 7 has a tapered crimping surface 10. The piston 11 of the auxiliary hydraulic cylinder 8 is kinematically

It is connected with the power piston 9, which, in turn, is associated with the mandrel 6, and this connection is made in the form of a collet lock consisting of a lobe element 12 with the shoulder 13, the hook 14 and the stop 15.

The collet lock can have 2 versions (see Figs. 2 and 3).

FIG. 2 shows a collet lock with a petal element 12, which is inserted inside the hook 14.

FIG. 3 shows a collet lock with a petal element 12, in which the hook 14 is located inside, not outside.

To return the mandrel 6 to its original position, a return spring 16 is installed. The main hydraulic cylinder has only one working cavity 17, which can be connected to the cavity 18 of the auxiliary hydraulic cylinder 8. The auxiliary hydraulic cylinder 8 has a cavity 19 and a cut-off channel 20 formed in the wall of the hydraulic cylinder.

The device works as follows.

In the initial position, both vehicles 11 are in the extreme right position (Fig. 1). The hose 2 is inserted into the axial hole of the guide sleeve 4, and the nipple 3 is put on the mandrel 6. Then the working pressure is applied in the cavity 17 "18, and the pistons 9 and 11 are moved to the left, the conical surface 10 acts on the petals 5. The end 1 is crimped and the mandrel 6 fixes the inner surface of the nipple 3 without allowing it to deform. At the end of the reduction through channel 20 is reset.

to drain the working fluid from the cavity 18, and, consequently, the working pressure drops in the cavity 18 and 17.

At the end of the crimping process, the working pressure is supplied to the cavity 19, 9

and 11 are displaced to the right, the petals 5 are dispensed with, and then the force from the rims by means of the collet lock pulls the mandrel 6 from the embedment 1. The hose 2 with the embedment crimped at its end 1 is removed from

devices.

The collet lock when moving backwards is triggered, since the petal element 12, the raid on the support 15, is compressed (Fig. 2), releasing the hook 14, after which the spring 16 returns the mandrel 6 to the starting position.

The collet lock represented in FIG. 3. Only in this case, the petal element 12, the foray into the stop .15, opens and, by releasing the hook 14, returns the mandrel 6 to its original position with the help of the spring 16.

The cutoff channel 20 serves to provide a shortened axial head gap of 9 and 11. Through this channel, the working fluid is discharged from the cavity 19 to discharge.

In case it is necessary to carry out a full back stroke (for example for changing the petals 5), the cutoff channel 20 is completely closed.

The use of the proposed device instead of the known ones allows to increase the productivity of the manufacture of fittings at the ends of the hoses, and also to simplify the design of the device in comparison with the known ones.

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Claims (2)

1. DEVICE FOR COMPRESSING THE HOSE END NIPPEL, containing a coaxially mounted guide sleeve with petals, a mandrel to limit deformation of the inner surface of the nipple, associated with a-correction and between themselves a power hydraulic cylinder, in the cavity of which a piston with a conical crimping surface is placed, and an auxiliary hydraulic cylinder, characterized in that, in order to increase performance, the mandrel is spring-loaded relative to the piston of the power hydraulic cylinder and connected with it through a collet lock with a mechanism for its opening. 2. The device according to π. 1, characterized in that in the wall of the auxiliary hydraulic cylinder there is a channel for draining fluid from its supra-piston cavity.