Automatic Bar Wrapping Machine: Sizing Steel Bar Bundles

Name: 自动条形包装机
Uploaded: 2018-04-19T01:51:08+00:00
Duration: 1 min 46 s
Description: > **Executive summary** > Our automatic bar wrapping machine spiral wraps bundles of steel bars as they pass through a rotating ring, then cuts and holds the film for the next bundle with no operator. For steel bars, the bundle weight often limits the model before the diameter does. A…

执行摘要 Our automatic bar wrapping machine spiral wraps bundles of steel bars as they pass through a rotating ring, then cuts and holds the film for the next bundle with no operator. For steel bars, the bundle weight often limits the model before the diameter does. A 6 m, 20 mm steel bar weighs about 14.8 kg, so a 100 kg rated wrapper takes about 6条每捆。

How the machine wraps a bar bundle

In this installation, our wrapper sits inline with the bar line’s roller conveyor, so bundles are wrapped as they pass through without being lifted off the line. The cycle has four stages:

进料。 The motor-driven entrance conveyor carries the bundle to the ring. A photocell sets the wrapping position.
裹。 The ring turns around the bundle while the conveyor moves it forward, laying a spiral of film.
Cut and hold. The mechanical hand cuts the film and holds the tail.
出料。 The outlet conveyor carries the wrapped bundle away.

Ring speed and conveyor speed are set by inverters, and the overlap is adjustable from 10% to 90%.

Horizontal orbital stretch wrapper E300 with wrapping ring and motor-driven infeed and outfeed conveyors — **水平轨道式拉伸包装机 E300。** The ring wraps the bundle as the conveyors move it through.

Why weight decides the model

Steel is heavy for its size. Each model has a weight limit as well as a bundle OD window, and for steel bars the weight limit is often reached first. Steel weighs about 7,850 kg per cubic metre, so the weight of one bar is:

每米重量 = 7,850 × π ÷ 4 × d², with d in metres.
20 mm bar: about 2.47 kg per metre, so a 6 m bar weighs about 14.8 kg.
12 mm bar: about 0.89 kg per metre, so a 6 m bar weighs about 5.3 kg.

Bars per bundle

Divide the model’s weight limit by the weight of one bar. For 6 m bars:

巴	Weight per bar	最高100 kg	最高200 kg
12 毫米	约5.3公斤	18条	37条
20 毫米	约14.8公斤	6条	13条

Then check the bundle OD. Thirteen 20 mm bars make a slim bundle, well below 200 mm across. That is heavier than the 100 kg models allow, but below the 200 mm minimum OD of our 200 kg model. A bundle like this falls between standard windows, so we customise the ring and conveyors for it.

Model windows

型号	捆绑外径	重量	Min. length	包装速度
E300	100–300毫米	15-100 kg	超过1,000毫米	5–15 米/分钟
E400	100–400毫米	15-100 kg	超过1,200毫米	5–25 米/分钟
E600	200–600毫米	20-200 kg	超过800毫米	set in proposal

The E300 and E400 have 2,000 mm motor-driven infeed and outfeed conveyors, conveyor speed 6–12 m/min and ring speed 20–90 r/min. The E400 also runs paper, PP and woven material on 50 or 76 mm cores. On the E600, side protective devices are adjusted by hand to keep the bundle from shaking during wrapping, and a top press device with soft material holds it from above.

Unmanned film cut and feed

The automatic cutter and feeder is what makes the machine run without an operator:

喂食。 The film is clamped and fed automatically at the start of each bundle.
切割。 The film is cut automatically at the end.
位置。 The photocell sets the wrapping position, and a sensor resets the ring to its start position.
故障。 Alarms show on the indicator and in the program.

The PLC runs the wrap to your packing goal, and the machine can connect to the packing line.

公用设施和安全

公用事业	E300 / E400
电力	about 2.5 kW, 380 V, 3 phase, 60 Hz
胶卷	OD 100–200 mm, width 100–200 mm
地板	flat, hard ground, load over 1 t/m² (E300)
压缩空气	您的提案已确认

The ring has soft start and stop, and guardrails cover the moving parts. The standards that apply depend on the destination market. For CE markets, ISO 12100 sets the risk-assessment method and EN 415-10 sets general requirements for packaging machines.

酒吧包装机选型清单

Bar diameter, length and material.
Bars per bundle, and the bundle weight this gives.
Bundle OD, smallest and largest.
Bundles per hour and the wrapping speed needed.
Wrapping material: film, paper, PP or woven.
Inline with the bundling line, or standalone.

工程常见问题解答

Q: How much does a 6 m, 20 mm steel bar weigh? A: About 14.8 kg, from 7,850 kg/m³ × π ÷ 4 × d² × length.

Q: How many 20 mm bars fit a 100 kg wrapper? A: About 6 bars of 6 m. A 200 kg model takes about 13.

Q: What if my bundle is heavy but slim? A: It can fall between standard windows, as with thirteen 20 mm bars. We customise the ring and conveyors for it.

Q: Does the machine need an operator? A: No. The automatic cutter and feeder clamps, feeds and cuts the film for unmanned operation.

Q: What is the shortest bundle the E300 can wrap? A: Over 1,000 mm, so the bundle spans the conveyors while it passes the ring.

下一步

We size your bar wrapper in three steps:

提交您的布局图 with bar sizes, bars per bundle and bundles per hour to info@fhopepack.com.
48小时内收到方案以及模型和传送带布局。
预约现场勘测 to fit the wrapper to your bar line.