Method for underwater explosive compounding of corrosion-resistant piston rod of hydraulic support in coal mine

Abstract

The present application discloses a method for underwater explosive compounding of a corrosion-resistant piston rod of a hydraulic support in a coal mine, which specifically includes the following steps: (1) firstly uniformly arrange support materials on the outside of the piston rod substrate, then coaxially arrange a corrosion-resistant metal pipe coating, then seal the piston rod substrate and both ends of the corrosion-resistant metal pipe, reserve a vacuum port, and evacuate to obtain a vacuum environment in the gap between the piston rod substrate and the corrosion-resistant metal pipe; (2) then coaxially arrange an explosive laying pipe outside the corrosion-resistant metal pipe, and reserve a set spacing to place explosives and detonators on the inner wall of the explosive laying pipe; (3) place the device in an explosion water tank, fix it, inject water, and detonate the explosives to obtain a corrosion-resistant piston rod. The present application adopts underwater explosive compounding technology to compound the corrosion-resistant metal pipe on the piston stem substrate, which significantly improves the bonding strength of the coating and the base layer, reduces the production cost, and at the same time significantly reduces the degree of oxidation of the welding interface during the explosion, ensuring the welding quality.

Description

Technical Field

[0001] The present application relates to the technical field of explosive compounding, and in particular to a method for underwater explosive compounding of corrosion-resistant piston rods of hydraulic supports in underground coal mines. Background Art

[0002] Explosive bonding is a solid-state welding process that uses the high pressure generated by the explosion of explosives to metallurgically bond two or more metals, the same or different. In the metal manufacturing and processing industry, explosive bonding is often used to produce a variety of multi-metal composite materials with a wide range of uses. In terms of reducing production costs and improving product quality, explosive bonding has advantages that traditional metal bonding methods cannot match.

[0003] Among them, the corrosion-resistant piston rod of the underground hydraulic support of coal mines produced by explosive composite technology can not only ensure that the original properties of the metal material remain unchanged, but also combine different advantages such as strong corrosion resistance, high strength, and good plasticity, thereby increasing the service life of the hydraulic support and reducing production costs.

[0004] There are four main processes for surface treatment of corrosion-resistant piston rods of hydraulic supports in coal mines: 1. Electrochromium plating process; 2. Chemical plating process; 3. Laser cladding process; 4. Plasma cladding process. In the past, the electrochromium plating process was mainly used, but it had a short service life and was prone to cracks and voids. Now the laser cladding process is mainly used, but the metal powder used for laser cladding is expensive and mainly relies on imports, with high processing energy consumption, low efficiency and high cost. The underwater explosive composite technology has high efficiency, low cost, and high bonding strength of the corrosion-resistant layer, which provides application space for the underwater explosive composite technology.

[0005] Therefore, how to develop a method for preparing a corrosion-resistant piston rod underwater explosion composite for a hydraulic support in a coal mine is an urgent problem to be solved by technicians in this field. Summary of the invention

[0006] Based on the technical problems existing in the background technology, the present application proposes a method for underwater explosive compounding of a corrosion-resistant piston rod of a hydraulic support in an underground coal mine.

[0007] The method for underwater explosive compounding of corrosion-resistant piston rods of hydraulic supports in coal mines proposed in this application has the following steps:

[0008] S1: evenly arrange the supporting materials on the piston rod substrate in sequence, then coaxially arrange the corrosion-resistant metal pipe coating, and then seal the gap between the piston rod substrate and the corrosion-resistant metal pipe, and reserve a vacuum port for vacuuming;

[0009] S2: Coaxially arrange an explosive laying pipe outside the corrosion-resistant metal pipe, evenly lay explosives on the inner wall of the explosive laying pipe with a set spacing, and insert a detonator into the explosives;

[0010] S3: Place the device in an explosion water tank, fill it with water and detonate the explosive to obtain a corrosion-resistant piston rod.

[0011] Preferably, the piston rod substrate is a round steel column.

[0012] Preferably, the cross-sectional diameter of the piston rod substrate is 5-30 cm.

[0013] Preferably, the corrosion-resistant metal pipe is a stainless steel pipe.

[0014] Preferably, the wall thickness of the corrosion-resistant metal pipe is 0.05-0.3 cm.

[0015] Preferably, the explosive laying pipe is a rigid polyvinyl chloride pipe.

[0016] Preferably, the wall thickness of the rigid polyvinyl chloride tube is 0.2-0.8 cm.

[0017] Preferably, the explosive is an emulsion explosive.

[0018] Preferably, the density of the emulsion explosive is 1.05-1.25 g / cm 3 , the explosion speed is 3500-5000m / s.

[0019] Beneficial technical effects of this application:

[0020] The entire explosion composite process of the present application is completed underwater. The water medium can better absorb excess energy waves, explosion noise and exhaust gas generated by the explosion, significantly reducing the potential risk factor of explosion welding and its impact on the surrounding environment. At the same time, the present application significantly reduces the degree of oxidation of the composite interface during the explosion process through the dual combination of vacuum sealing technology and water environment, thereby ensuring the welding quality. DETAILED DESCRIPTION

[0021] The present application will be further explained below in conjunction with specific embodiments.

[0022] Example 1

[0023] The preparation method of the underwater explosion composite of the corrosion-resistant piston rod of the underground hydraulic support of the coal mine proposed in the present application specifically comprises the following steps:

[0024] (1) First, support materials are evenly arranged outside the piston rod substrate with a cross-sectional diameter of 5 cm, and then a 0.05 cm stainless steel tube is coaxially arranged, and then the gaps on both sides of the piston rod substrate and the stainless steel tube are sealed, and a vacuum port is reserved, fixed, and vacuumed to obtain a vacuum environment in the gap between the piston rod substrate and the stainless steel tube;

[0025] (2) A 0.2 cm thick rigid polyvinyl chloride tube is coaxially arranged outside the stainless steel tube, and explosives and detonators are placed on the inner wall of the rigid polyvinyl chloride tube with a predetermined spacing. The density of the emulsion explosive is 1.05 / cm 3 , the detonation speed is 3500m / s, and the explosive device is obtained;

[0026] (3) Place the device in an explosion water tank, fix it, fill it with water to a certain height, and detonate the explosive to obtain a corrosion-resistant piston rod.

[0027] Example 2

[0028] The preparation method of the underwater explosion composite of the corrosion-resistant piston rod of the underground hydraulic support of the coal mine proposed in the present application specifically comprises the following steps:

[0029] (1) First, support materials are evenly arranged outside the piston rod substrate with a cross-sectional diameter of 12 cm, and then a 0.2 cm stainless steel tube is coaxially arranged, and then the gaps on both sides of the piston rod substrate and the stainless steel tube are sealed, and a vacuum port is reserved, fixed, and vacuumed to obtain a vacuum environment in the gap between the piston rod substrate and the stainless steel tube;

[0030] (2) A 0.5 cm thick rigid polyvinyl chloride tube is coaxially arranged outside the stainless steel tube, and explosives and detonators are placed on the inner wall of the rigid polyvinyl chloride tube with a predetermined spacing. The density of the emulsion explosive is 1.15 g / cm 3 , the detonation speed is 4200m / s, and the explosive device is obtained;

[0031] (3) Place the device in an explosion water tank, fix it, fill it with water to a certain height, and detonate the explosive to obtain a corrosion-resistant piston rod.

[0032] Example 3

[0033] The preparation method of the underwater explosion composite of the corrosion-resistant piston rod of the underground hydraulic support of the coal mine proposed in the present application specifically comprises the following steps:

[0034] (1) First, support materials are evenly arranged outside the piston rod substrate with a cross-sectional diameter of 30 cm, and then a 0.3 cm stainless steel tube is coaxially arranged, and then the gaps on both sides of the piston rod substrate and the stainless steel tube are sealed, and a vacuum port is reserved, fixed, and vacuumed to obtain a vacuum environment in the gap between the piston rod substrate and the stainless steel tube;

[0035] (2) A 0.8 cm rigid polyvinyl chloride tube is coaxially arranged outside the stainless steel tube, and explosives and detonators are placed on the inner wall of the rigid polyvinyl chloride tube with a predetermined spacing. The density of the emulsion explosive is 1.25 g / cm 3 , the detonation speed is 5000m / s, and the explosive device is obtained;

[0036] (3) Place the device in an explosion water tank, fix it, fill it with water to a certain height, and detonate the explosive to obtain a corrosion-resistant piston rod.

[0037] The corrosion-resistant piston rods prepared in Examples 1-3 were respectively taken and the microstructure of the welding interface was observed using a metallographic microscope to check whether there was an oxide layer and oxidation defects. The results are shown in Table 1.

[0038] Table 1 Inspection results of welding interface of composite metal bars of Examples 1-3

[0039] Corrosion resistant piston rod Whether there is an oxide layer and oxidation defects at the composite interface Example 1 no Example 2 no Example 3 no

[0040] As can be seen from Table 1, it was found that the composite interfaces of the corrosion-resistant piston rods of Examples 1-3 did not have oxide layers and oxidation defects.

[0041] The above experiments show that the entire explosion composite process of the present invention is completed underwater, and the water medium can better absorb excess energy waves, explosion noise and exhaust gas generated by the explosion, which significantly reduces the potential risk factor of explosion welding and its impact on the surrounding environment, and greatly reduces production costs; at the same time, the present invention significantly reduces the degree of oxidation of the composite interface during the explosion process through the dual combination of vacuum sealing technology and water environment, thereby ensuring the welding quality.

[0042] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application. The scope of the present application is defined by the appended claims and their equivalents, and all shall be included in the scope of protection of the present application.

Claims

1. A method for underwater explosive compounding of corrosion-resistant piston rods of hydraulic supports in coal mines, characterized in that: The steps are as follows: S1: evenly arrange the supporting materials on the piston rod substrate in sequence, then coaxially arrange the corrosion-resistant metal pipe coating, and then seal the gap between the piston rod substrate and the corrosion-resistant metal pipe, and reserve a vacuum port for vacuuming; S2: Coaxially arrange an explosive laying pipe outside the corrosion-resistant metal pipe, evenly lay explosives on the inner wall of the explosive laying pipe with a set spacing, and insert a detonator into the explosives; S3: Place the device in an explosion water tank, fill it with water and detonate the explosive to obtain a corrosion-resistant piston rod.

2. The method for underwater explosive compounding of corrosion-resistant piston rods of hydraulic supports in coal mines according to claim 1 is characterized in that: The piston rod base material is a round steel column.

3. The method for underwater explosive compounding of corrosion-resistant piston rods of hydraulic supports in coal mines according to claim 1 is characterized in that: The cross-sectional diameter of the piston rod substrate is 5-30 cm.

4. The method for underwater explosive compounding of corrosion-resistant piston rods of hydraulic supports in coal mines according to claim 1 is characterized in that: The corrosion-resistant metal pipe is a stainless steel pipe.

5. The method for underwater explosive compounding of corrosion-resistant piston rods of hydraulic supports in coal mines according to claim 1 is characterized in that: The wall thickness of the corrosion-resistant metal pipe is 0.05-0.3 cm.

6. The method for underwater explosive compounding of corrosion-resistant piston rods of hydraulic supports in coal mines according to claim 1 is characterized in that: The explosive laying pipe is a hard polyvinyl chloride pipe.

7. The method for underwater explosive compounding of corrosion-resistant piston rods of hydraulic supports in coal mines according to claim 1 is characterized in that: The wall thickness of the rigid polyvinyl chloride tube is 0.2-0.8 cm.

8. The method for underwater explosive compounding of corrosion-resistant piston rods of hydraulic supports in coal mines according to claim 1 is characterized in that: The explosive is an emulsion explosive.

9. The method for underwater explosive compounding of corrosion-resistant piston rods of hydraulic supports in coal mines according to claim 8, characterized in that: The density of the emulsion explosive is 1.05-1.25 g / cm 3 , the explosion speed is 3500-5000m / s.