CN110877136A

CN110877136A - Differential pressure type flame cutting powder spraying device and method

Info

Publication number: CN110877136A
Application number: CN201911186535.1A
Authority: CN
Inventors: 方欣; 郑壮; 李正庭
Original assignee: Shanxi Taigang Stainless Steel Co Ltd
Current assignee: Shanxi Taigang Stainless Steel Co Ltd
Priority date: 2019-11-28
Filing date: 2019-11-28
Publication date: 2020-03-13

Abstract

A pressure difference type flame cutting powder spraying device is characterized in that a throttling valve and a pressure gauge are installed on a back pressure air pipe of a powder storage tank of the existing equal pressure type flame cutting powder spraying device. When the back pressure of the powder storage tank is greater than the pressure of the powder outlet pipe, the powder outlet amount is adjusted by adjusting the pressure difference; when the back pressure of the powder storage tank is smaller than the pressure of the powder outlet pipe, a pressure release valve at the top of the powder storage tank is opened to realize reverse spraying, and a blockage in the powder spraying pipe is reversely blown out, so that the powder spraying pipe is unblocked, and the accurate control of the powder spraying amount is realized. The invention eliminates the blockage fault of the flame cutting powder spraying device; meanwhile, the iron powder is saved by 30 percent; the stainless steel cutting section is continuous and flat; the labor cost of spare parts of the powder spraying device of the flame cutting machine is reduced.

Description

Differential pressure type flame cutting powder spraying device and method

Technical Field

The invention is used for stainless steel cutting and powder spraying.

Background

Fig. 1 shows, current isobaric formula flame cutting powder spray device, including storing up powder jar 1, relief valve 2, tube clamp valve 3, go out powder pipe 4, switching-over valve 5, manometer 6, choke valve 7, store up 1 tops of powder jar and set up relief valve 2, store up 1 bottoms of powder jar and connect tube clamp valve 3, powder pipe 4 is connected to 3 one ends of tube clamp valve, 5 one ends of switching-over valve are connected to the 3 other ends of tube clamp valve, the nitrogen gas input tube is connected to the 5 other ends of switching-over valve, store up and install a choke valve, a manometer on the powder jar backpressure trachea. When the stainless steel billet is cut by the flame cutting machine, because the stainless steel contains a large amount of alloy components (such as chromium, nickel and the like), a layer of high-melting-point oxide film is generated on the surface of the stainless steel in the cutting process, the contact of metal and high-speed oxygen flow is blocked, and the combustion of the next layer of metal is blocked, so that the stainless steel billet cannot be cut normally. Only the iron powder is used as combustion-supporting oxygen flux, so that the iron powder continuously enters a cutting area along with cutting oxygen flow in the cutting process, the iron powder generates violent oxidation reaction in flame, a large amount of heat energy is released, the upper part of a cutting opening is melted, and meanwhile, the fluidity of slag is improved, so that the cutting is smoothly finished.

The introduction of iron powder must be synchronized with the cutting. The traditional powder spraying device takes nitrogen as power, is formed by controlling iron powder by a pneumatic pipe clamp valve and comprises an equal-pressure type powder storage tank, in the production process, the iron powder is condensed to block a spray pipe, which is a main cause of failure, the powder spraying pipe needs to be disassembled for dredging when the iron powder is condensed, the powder spraying pipe needs to be replaced if necessary, a large amount of iron powder is wasted, and a large amount of manpower is consumed.

In addition, the isobaric powder spraying device also has the defect that the pressure difference is not adjustable, when powder is sprayed, the outlet pressure is equal to the back pressure of the powder storage tank, so that the phenomenon that the iron powder is deadened by airflow is easy to occur, and in order to avoid the phenomenon, repeated debugging is needed, the workload is increased, and the waste of the iron powder is caused.

Disclosure of Invention

The invention provides a pressure difference type flame cutting powder spraying device for avoiding blockage of a spray pipe due to coagulation of iron powder.

The utility model provides a differential pressure formula flame cutting duster, characterized by installs choke valve, manometer on current isobaric formula flame cutting duster's storage powder jar backpressure trachea, realizes adjustable pressure differential with powder outlet pipe pressure: when the back pressure of the powder storage tank is greater than the pressure of the powder outlet pipe, the powder outlet amount is adjusted by adjusting the pressure difference; when the back pressure of the powder storage tank is smaller than the pressure of the powder outlet pipe, a pressure release valve at the top of the powder storage tank is opened to realize reverse spraying, and blockages in the powder spraying pipe are blown out reversely to ensure that the powder spraying pipe is unblocked.

The invention eliminates the blockage fault of the flame cutting powder spraying device; meanwhile, the iron powder is saved by 30 percent; the stainless steel cutting section is continuous and flat; the labor cost of spare parts of the powder spraying device of the flame cutting machine is reduced.

Drawings

Fig. 1 is a structural diagram of a conventional isobaric flame cutting powder spraying device.

Fig. 2 is a block diagram of the present invention.

In the figure, 1, a powder storage tank, 2, a pressure release valve, 3, a pipe clamp valve, 4, a powder outlet pipe, 5, a reversing valve, 6, a pressure gauge, 7 and a throttle valve.

Detailed Description

FIG. 2 shows, a differential flame cutting powder spray device, including storing up powder jar 1, the relief valve 2, the tube clamp valve 3, go out powder pipe 4, the switching-over valve 5, manometer 6, the choke valve 7, store up 1 top of powder jar and set up relief valve 2, store up 1 bottom connecting tube clamp valve 3 of powder jar, powder pipe 4 is connected to 3 one end of tube clamp valve, switching-over valve 5 one end is connected to the 3 other end of tube clamp valve, the nitrogen gas input tube is connected to the 5 other ends of switching-over valve, the backpressure trachea way sets up two choke valves 7 and two manometer 6 on storing up the powder jar, make and store up powder jar backpressure and go out powder pipe pressure formation pressure differential. When the powder outlet pipe is blocked, the back pressure of the powder storage tank is reduced, the pressure of the powder outlet pipe is greater than the back pressure of the powder storage tank, the pressure release valve at the top of the powder storage tank is opened, reverse spraying is realized, and the blocking object coagulation block is blown back into the powder storage tank, so that the coagulation block is crushed, and the powder outlet pipe is dredged.

The test is carried out on a BGT-247 flame cutting machine in a steel rolling operation area of a Tai steel section bar factory, the cutting machine has two sets of 1# and 2# cutting devices, an equal-pressure powder spraying device is installed on the 1# cutting machine, a differential-pressure powder spraying device is installed on a 2# gun, 40 experimental stainless steel plate blanks with 5 furnaces are arranged, wherein 20 traditional equal-pressure cutting devices are used for cutting, and 20 differential-pressure cutting devices are used for cutting, and the records are as follows:

and (4) test conclusion:

1. the equal-pressure cutting machine has the fault of iron powder slagging blockage for 2 times in the production process, and production personnel timely remove the powder outlet pipe for cleaning, and the time is 0.5 hour. The differential pressure type cutting machine of the invention can reversely spray, has simple operation and does not generate failure time. Therefore, the failure rate of the differential pressure type flame cutting powder spraying device is reduced by 100 percent;

2. the cutting efficiency of the isobaric cutting machine is 0.142 h/block, the cutting efficiency of the differential pressure type cutting machine is 0.104 h/block, and the cutting efficiency is improved by 26.8%;

3. because the equal-pressure cutting machine has 2 blockage faults, iron powder is wasted during cleaning, and 40kg of iron powder is consumed in total; the differential pressure type cutting machine consumes 25kg, and iron powder is saved by 37.5%.

When the flame cutting machine is used for cutting stainless steel billets, iron powder is used as a combustion-supporting oxygen flux, so that the iron powder continuously enters a cutting area along with a cutting oxygen flow in the cutting process to smoothly finish cutting.

Claims

1. A pressure difference type flame cutting powder spraying device is characterized in that a throttling valve and a pressure gauge are installed on a back pressure air pipe of a powder storage tank of the existing equal pressure type flame cutting powder spraying device.

2. The differential pressure type flame cutting powder spraying device as claimed in claim 1, wherein when the back pressure of the powder storage tank is greater than the pressure of the powder outlet pipe, the powder outlet amount is adjusted by adjusting the differential pressure; when the back pressure of the powder storage tank is smaller than the pressure of the powder outlet pipe, a pressure release valve at the top of the powder storage tank is opened to realize reverse spraying, and blockages in the powder spraying pipe are blown out reversely to ensure that the powder spraying pipe is unblocked.