Glass tubing is drawn out from the tip of the sleeve

Preface

Danner process, which is a horizontal glass tubing technology, is the most usual choice for soda-lime, lead and borosilicate glass tubing drawing. This process provides good accuracy in diameter, thickness; bow and ovality as well as lopside, thus the most glass tubing production lines in the world were and are equipped with Danner process and its machines.

Beijing Quarts V. Glass Co., Ltd. supply either single machine or complete tubing drawing line, meanwhile Vello process equipment and whole line are also available to be provided.

2.

Components of Danner Process Equipment

The Danner process consists of a trough at the end of forehearth, a Muffle in which a hollow refractory mandrel aslant installed and called as Sleeve, a Sleeve driver, tubing running alley and a Danner drawing machine together with cutter(s) as well as a precise cutting & glazing machine. The accessories of Danner tubing line are combustion system for Muffle, temperature control system of trough and Muffle as well as dimensions detectors for outside diameter and wall thickness, glass defects some cases. 

3.

Muffle

The Muffle is a kind of oven with two layers, the first layer is made of Silicon Carbon (SiC) plates that form an oval shape chamber, in center of which the sleeve locates. The molten glass from forehearth through a refractory gate flows out of the trough and falls down as glass ribbon to the sleeve.

4.

Sleeve part

A refractory mandrel plays a role of the sleeve that fixes on the sleeve shaft. The size of sleeve depends on the size of the tubing to be drawn. The sleeve shaft is a bigger and longer enough heat-resistant steel axle with a straight hole in the center for inflating air.

Material: Sillimanite

Dimension: Length 1500mm

Diameter:270, 300, 330mm

5.

Sleeve driver

The sleeve driver is used to drive the sleeve shaft with sleeve rotating. Its main body is water cooled, the sleeve shaft in it is driven by a motor and the worm-gear box. There are several adjusting parts on the sleeve driver respectively, at the base of the support frame of the driver there are hydraulic cylinders to move the sleeve driver up/down and left/right at the initial stage of installation.

Main drive: 3.0Kw, 380V, 50Hz

Speed: 4 rpm (min.)–15 rpm (max.)

Diameter of chuck: 100 mm (75mm also available)

Number of rotation: 4–15 rpm, adjustable

Adjusting angle: 0°–15°, adjustable

Vertical stroke: 510 mm, adjustable

Back and forth stroke: 260 mm, adjustable

Lateral stroke: ±70 mm, adjustable

6.

Tubing Running Alley

The tubing running alley comprises two parts. The insulation cover made of steel plates eliminates the influence of environment temperature.  The cover and pit make a closed tunnel to be the first part. The other part is running alley that holds the glass tubing for a relative long distance mostly in the closed cases. Many rollers inside of the alley are free rotating by means of air bearings and playing the role of the tubing brackets..

   Tubing Running Alley and X-Y laser OD detector                            Rollers inside of the alley

7.

Drawing Machine (Danner Machine)

The Drawing machine usually includes cutting machine, which can be driven by the same motor used for the drawing machine or an independent motor. The drawing motor drives several rollers that are located at two layers shown as the photo below. The both upper and lower belts ring are hooped on the rollers. The tubing is running forward in the gap between both rotating belts. The rotating of the belts always enables tubing moving to the cuter. At the entrance of the drawing machine there are three guide rollers, two vertical rollers and one horizontal roller guides the tubing to the gap of belts.

The cutter can be single or double according to tube size and the line speed of tubing drawing. 

After cutting it is a sorting machine to reject NG tubes based on laser OD detector signals in the case of over tolerance of outside diameter.

Main drive unit: 3.0Kw, 380V, 50Hz

Glass tubing diameter:4.0–40mm

Drawing speed:25-200mm/min.

Cutting length:1000–1800mm

The Drawing machine following with cutter and sorting machine

8.

Precise cutting and Glazing

The tubes after sorting are qualified tubes in diameter, which are moving to re-cutting and glazing machine through the front conveyer (three segments) with line up machine.
The re-cutting is done by several pairs of burners at the both ends of the machine, i.e. both tube ends together are precisely cut with a pair of sharp and thin discs made of special steel. The cut tubes then move to be glazed by 6 pairs of glazing burner.
After glazing the hot tubes should be cooling down on a cooling conveyer, then the tubes can be packed.
Main drive unit: 1.5Kw ´2, 0.4 KW  380V, 50Hz 

Length:1200mm–1800mm

Precise cut and glazed glass tubing diameter:10–40mm

Cutting length:1200–1700mm

Full length of the machine:11m

We also supply the front conveyers installed before precise cutting machine and
cooling conveyer after glazing machine.

9.

Electric part

(1) Automatic control system

     ① Muffle roof temperature control system

     ② Muffle chamber temperature control system

     ③ Inflating air pressure control system

(2) Automatic sorting system

      Laser O.D. measuring system and sorting system

      General type (single direction) and X-Y type are available

(3) Automatic synchronizing system for any tubing specification

      All motors of conveyers and re-cutting & glazing machine after cutting should be synchronized to ensure no touch between tubes on the conveyers to avoid scratches.

(4) Monitoring system

      Tubing catenary monitoring system by ITV.

(5) Measuring system

      ① Measuring speed of sleeve driver
② Measuring speed of drawing machine

      ③ Measuring cut numbers, NG counter, OK counter after the first cutting

      ④ Measuring Muffle temperature at 5 points