HK1085162A - Method for producing a tapping valve formed as a plastic injection-molded part for plastic or metal shipping and storage tanks for liquids - Google Patents

Description

Method for producing a device for removing injection-molded parts from plastic or metal containers for transporting liquids

Technical Field

The invention relates to a method for producing a rotary valve (Klappenhahn) or ball valve (Kugelhahn) for a device for removing injection-molded parts, in particular for plastic or metal containers for transporting liquids. The removal device has a device housing with an inflow connector and an outflow connector, on which a union nut is arranged in a non-releasable and displaceable manner between a collar of the inflow connector and a bearing block of a rotary shaft in the device housing, which bears a closing element, for screwing the device housing onto the outflow connector of a liquid container with an external thread.

Background

A liquid storage and transport container is known from DE 10301517B 3, which comprises a plastic inner container on a tray-like base (pallet) and a grid casing. The removal device for the inner container is screwed onto the outflow nipple of the inner container by means of a plastic union nut, wherein the union nut consists of two half-nuts which are welded together on the inflow nipple and are not attached to the inflow nipple of the device in a manner such that they do not fall to the ground. When producing the aluminum union nut, the two nut halves are riveted together on the inflow nipple of the removal device. Such a method of attaching the union nut to the outflow nipple of the removal device is cumbersome and time-consuming, which increases the production costs.

Disclosure of Invention

The object of the invention is to develop a method for the cost-effective production of an injection-molded part removal device for a belt-mounted housing of a plastic or metal container for transporting liquids. The device housing has an inflow connection piece, on which a union nut is arranged in a non-falling manner for screwing the device housing onto an outflow connection piece of a liquid container with external thread.

This object is achieved according to the invention by providing a method for producing a rotary valve or ball valve for a plastic or metal liquid transport container, wherein the removal device has a device housing with an inlet connection and an outlet connection, a union nut being mounted on the inlet connection in a non-detachable and displaceable manner between the edge of the inlet connection and a bearing seat in the device housing, which bearing the axis of rotation of the closure element, for screwing the device housing onto the externally threaded outlet connection of the liquid container; in the first procedure, firstly manufacturing a locking nut in a first injection molding machine; the finished union nut is then inserted into a second injection molding machine, and the device housing is then produced in a second step: the inflow nipple of the device housing can pass through the through-hole of the annular shoulder and the threaded hole of the union nut with a clearance, while the edge of the inflow nipple of the device housing is arranged in the union nut.

This object is also achieved by a method for producing a removal device for injection-molded parts, in which, in a first step, the device housing and its inflow socket are injection-molded as special parts; in a second subsequent step, the inflow socket is welded to the device housing together with the union nut slid onto it.

Drawings

The invention is described below with reference to the accompanying drawings:

FIG. 1 is a longitudinal cross-sectional view of a rotary valve made according to a first method;

FIG. 2a is a side view of a rotating valve housing of an injection molded part;

FIG. 2b is a side view of a rotary valve inflow socket of an injection-molded part;

fig. 3 is a side view of a rotary valve, wherein the housing of the rotary valve and the inflow nipple are welded together with the mounted union nut according to a second method.

Detailed Description

The valve housing 2 of the rotary valve 1 made of high density polyethylene (PE-HD) has a valve plate 3 for opening and closing a central through-opening 4 of a valve chamber 5, which valve chamber 5 is connected to an inflow channel 6 of an inflow socket 7 and an outflow channel 8 of an outflow socket 9 of the valve housing 2. The valve plate 3 is eccentrically mounted on a shaft 10, the two ends 10a, 10b of the shaft 10 being rotatably received in bearings 11, 12 of the valve housing 2, wherein the upper end 10b of the shaft 10 protrudes through the valve housing 2 via the bearing 12. The rotary shaft 10 is sealed from the outside by a sealing ring 13 in a bearing 12. A handle 14 for opening and closing the rotary valve 1 is provided on one end 10b of the rotary shaft 10 of the valve plate 3 extending out of the valve housing 2.

The rotary valve 1 is fastened to an outlet connection 16 of a liquid container 17 (for example a plastic inner container of a plate container) by means of a plastic union nut 15, the liquid container 17 and the outlet connection 16 with an external thread 18 being integrally formed by means of a tuyere (Blasformen).

The union nut 15 is mounted between the collar 19 of the inlet connection 7 and the bearing blocks 11, 12 of the valve housing 2 for bearing the rotary shaft 10 of the valve plate 3 and is held in a non-removable manner on the inlet connection of the valve housing 2.

When the inlet connector 7 of the valve housing 2 is inserted into the outlet connector 16 of the liquid container 17 by screwing the union nut 15, which is held without falling onto the valve housing 2 on the inlet connector 7 and acts on the collar 19 of the inlet connector 7 via the annular shoulder 20, onto the outlet connector 16, the sealing ring 21 on the inlet connector 7 is clamped between the collar 19 and the outer end 16a of the outlet connector 16 of the liquid container 17, so that the housing 2 of the rotary valve 1 is sealed off from the liquid container 17.

In order to produce the rotary valve 1 with the non-falling union nut 15 on the inlet connection 7 of the valve housing 2, the union nut 15 is produced in a first step in a first injection molding machine. The finished union nut 15 is then inserted into a second injection molding machine, and the valve housing 2 is produced in a second process step: the inlet socket 7 of the valve housing 2 can be passed with play through the through-opening 22 of the annular shoulder 20 and the threaded opening 23 of the union nut 15, while the collar 19 of the inlet socket 7 of the valve housing 2 is placed in the union nut 15.

The second method of manufacturing the rotary valve 1 with the lock nut 15 is characterized in that: in a first step, the valve housing 2 and its inflow socket 7 are injection molded as special parts; in a second subsequent step, the inflow socket 7 is welded together with the union nut 15 slid onto it to the valve housing 2 in the position indicated by reference numeral 24 in fig. 3.

The valve housing 2 and the lock nut 15 of the rotary valve 1 can be manufactured from different plastic materials, depending on the different strength properties required.

Claims (3)

1. A method for producing a rotary valve or ball valve for a device for removing injection-molded parts, in particular for plastic or metal containers for transporting liquids, wherein the device comprises a device housing having an inlet connection and an outlet connection, a union nut being mounted on the inlet connection in a non-detachable manner and being displaceable between the edge of the inlet connection and a bearing of a rotary shaft in the device housing, which bears a closing element, for screwing the device housing onto the outlet connection of the externally threaded liquid container; characterized in that, in a first process, a lock nut (15) is firstly manufactured in a first injection molding machine; the finished union nut (15) is then inserted into a second injection molding machine, and the device housing (2) is then produced in a second step: the inflow socket (7) of the device housing (2) can pass through the through-opening (22) of the annular shoulder (20) and the threaded bore (23) of the union nut (15) with play, while the edge (19) of the inflow socket (7) of the device housing (2) is arranged in the union nut (15).

2. The method for producing a device for removing injection-molded parts, as claimed in claim 1, characterized in that, in a first step, the device housing (2) and its inflow socket (7) are injection-molded as special parts; in a second subsequent step, the inflow socket (7) is welded to the device housing (2) together with the union nut (15) slid onto it.

3. Method according to claim 1 or 2, characterized in that the device housing (2) and the lock nut (15) are made of different plastic materials.