Hydraulic support cylinder barrel accessory welding method suitable for various media

Abstract

The invention provides a hydraulic support cylinder barrel accessory welding method suitable for various media, the cylinder barrel accessory is made of stainless steel, a stainless steel cylinder is welded to an inner hole in the end, used for being connected with a cylinder barrel, of the cylinder barrel accessory, and the diameter of the stainless steel cylinder is larger than the designed inner diameter of a liquid passing hole in the side wall of the cylinder barrel; an inner hole of the cylinder barrel is roughly machined, a connecting hole and a welding groove are machined in the cylinder wall of the cylinder barrel, and the diameter of the connecting hole is matched with that of the stainless steel cylinder; the cylinder barrel accessory is welded to a connecting hole in the side wall of the cylinder barrel, and a welding seam on the inner wall side of the cylinder barrel is formed by welding a stainless steel material; the inner hole of the cylinder barrel is further machined to the size before anti-corrosion treatment; an original liquid through hole of the cylinder barrel accessory is used for alignment, the liquid through hole in the side wall of the cylinder barrel is drilled based on a stainless steel cylinder, and the inner wall of the liquid through hole in the side wall of the cylinder barrel is polished without burrs; and the inner hole of the cylinder barrel is subjected to anti-corrosion treatment, so that the inner hole of the cylinder barrel reaches the anti-corrosion treatment design size. The method has the advantage that corrosion prevention is achieved when liquid is seen by 100%.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic supports, in particular to a welding method for hydraulic support cylinder accessories suitable for various media. Background Art

[0002] At present, coal mining in coal mine comprehensive mining faces mainly adopts comprehensive mining units equipped with hydraulic supports, coal mining machines and scraper conveyors. Hydraulic cylinders are widely used in hydraulic supports, scraper conveyors and other equipment for operation. The transmission medium of hydraulic cylinders is emulsion or concentrated liquid, which requires high cost. At the same time, leakage will cause environmental pollution, which does not meet the requirements of green and sustainable development.

[0003] In order to promote green and environmental protection of coal mining, it is a development trend to use water medium instead of emulsion as transmission medium. Since water medium is highly corrosive, and the material of hydraulic cylinder is generally 27SiMn, 30CrMnSi and other alloy structural cylinders, it is easy to rust in water medium, which will not only cause pure water pollution but also cause hydraulic cylinder failure. The use of stainless steel for the entire cylinder will increase the cost, and the performance of stainless steel is lower than that of alloy structural cylinders. At present, there are cases of pure water hydraulic cylinders in the market, but in terms of anti-corrosion treatment, the anti-corrosion treatment is not thorough, and some surfaces in contact with water do not have an anti-corrosion layer, and the rust problem still exists. How to achieve 100% liquid and anti-corrosion of hydraulic cylinders has become an industry problem.

[0004] Patent CN114160776B discloses a method for manufacturing a fully protected hydraulic support column suitable for a variety of media. The joint seat, liquid pipe, etc. are made of stainless steel, and the liquid hole is processed by copper welding wire surfacing, which solves the corrosion problem of the liquid hole and the joint seat, but the corrosion resistance of the fitting surface of the joint seat and the cylinder is not treated.

[0005] Patent CN214698594U mentions that a pure water hydraulic cylinder structure is made of stainless steel for the liquid through hole and stainless steel is used for welding, but does not mention the specific processing and manufacturing method. The stainless steel weld 20 is welded by alloy steel and stainless steel, and there is no explanation on how to ensure the corrosion resistance of the weld. Therefore, only the structural design of avoiding rust by using stainless steel is disclosed, but no more in-depth analysis of the problems at the process level is conducted.

[0006] In general, whether from the perspective of technological trends or patent protection, the use of stainless steel to replace traditional cylinder accessories is a trend and there are corresponding discussions and records. However, these technical discussions and records are still at a relatively conceptual level. To implement the concept into specific products, there are still many difficulties in the process level and the details of the specific connection positions that have not been overcome. As a result, under the premise that these concepts are simply implemented, hydraulic cylinders still have local corrosion problems.

[0007] For example, in the prior art, the material of the joint seat is replaced with stainless steel, but the surface roughness of the liquid hole in the cylinder wall is difficult to control, the quality of the anti-corrosion treatment is poor, and it is still easy to rust. Moreover, the joint seat and the cylinder wall contact surface is a blind spot for treatment, and rust often occurs, causing the hydraulic cylinder to fail.

[0008] Therefore, how to achieve 100% liquid-proof and corrosion-resistant hydraulic cylinder is the core issue that needs to be addressed in this application.

[0009] In order to solve the above problems, people have been seeking an ideal technical solution. Summary of the invention

[0010] The purpose of the present invention is to address the deficiencies of the prior art and thereby provide a hydraulic cylinder that is 100% liquid-proof and corrosion-resistant, and deeply solves the problem that the hydraulic cylinder can use water as a transmission medium, and is a hydraulic support cylinder accessory welding method that is adaptable to multiple media.

[0011] In order to achieve the above purpose, the technical solution adopted by the present invention is: a welding method for cylinder accessories of a hydraulic support suitable for various media, wherein the material of the cylinder accessories is stainless steel, and the material of the cylinder is non-stainless steel, and the method comprises the following parts: Part I: A stainless steel cylinder is welded at the inner hole of one end of the cylinder accessory for connecting to the cylinder, and the diameter of the stainless steel cylinder is larger than the designed inner diameter of the liquid through hole on the side wall of the cylinder; The inner hole of the cylinder is roughly machined, and a connecting hole and a welding groove are machined on the cylinder wall of the cylinder, wherein the diameter of the connecting hole matches the diameter of the stainless steel cylinder; Part II: The cylinder accessories are welded to the connection holes on the cylinder side wall, and the weld on the inner wall of the cylinder is formed by welding with stainless steel; Further process the inner bore of the cylinder to the size before anti-corrosion treatment; Align the original liquid hole of the cylinder barrel accessories, drill the liquid hole through the side wall of the cylinder barrel based on the stainless steel cylinder, and grind the inner wall of the liquid hole on the side wall of the cylinder barrel to remove burrs; Part III: Carry out anti-corrosion treatment on the inner hole of the cylinder to make it reach the design size of anti-corrosion treatment.

[0012] Based on the above, in the first part, the cylinder accessory is used to connect the inner hole of one end of the cylinder and a welding groove is pre-processed, and the stainless steel cylinder is welded based on the welding groove. The weld here is formed by stainless steel welding and polished to ensure that the weld is not protruding and there is no leakage.

[0013] Based on the above, in the first part, the diameter of the stainless steel cylinder is 2-3 mm larger than the designed inner diameter of the liquid through hole on the side wall of the cylinder.

[0014] Based on the above, in the second part, the fillet weld of the outer wall of the cylinder barrel is welded with ordinary high-strength welding wire.

[0015] Based on the above, the cylinder accessories are a joint seat, a control valve seat or a liquid pipe.

[0016] Based on the above, the cylinder accessory is a joint seat. In the third part, the liquid through hole of the joint seat is aligned and the liquid through hole of the cylinder side wall is drilled through, and the outer end of the liquid through hole of the joint seat is blocked with a stainless steel plug and welded.

[0017] Based on the above, in the second part, after the cylinder accessories are welded, the end face of the cylinder is leveled and the inner diameters of each section in the cylinder are processed to the same size.

[0018] Based on the above, in the third part, before the anti-corrosion treatment, the inner diameters of different sections in the cylinder are processed to the designed dimensions before the anti-corrosion treatment.

[0019] Compared with the prior art, the present invention has outstanding substantial features and significant progress. Specifically, the present invention utilizes a cylinder accessory and a stainless steel cylinder to form a complete accessory installed on the side wall of the cylinder. The weld is formed by stainless steel welding, and then a liquid hole is drilled based on the stainless steel cylinder, so that the entire wall surface of the liquid hole is stainless steel with high precision, and further, the dead angle areas such as the inner wall of the cylinder, the liquid hole, and all the fitting surfaces of the cylinder accessories are also covered with stainless steel, achieving 100% full protection of the cylinder contacting liquid area, thereby ensuring that the usable range of the transmission medium of the hydraulic cylinder is greatly increased, ensuring the high reliability and long life of the hydraulic cylinder when operating underground, and also having good processability.

[0020] Compared with the traditional solution, the inner wall of the liquid hole on the side wall of the newly constructed cylinder is made of stainless steel, and the fitting surface between the cylinder accessories and the cylinder is the transition area between the stainless steel structure and the weld. This frees these areas that are difficult to treat with anti-corrosion and have blind spots in anti-corrosion treatment in the traditional solution from anti-corrosion problems and improves the anti-corrosion ability.

[0021] The hydraulic cylinder products manufactured through this solution have simpler manufacturing processes, higher reliability, convenient operation at the fluid holes, higher processing efficiency, and lower processing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the hydraulic cylinder in the present invention.

[0023] Figure 2 It is a matching diagram of the joint seat and the stainless steel cylinder in the present invention.

[0024] Figure 3 It is a schematic diagram of the joint seat and the stainless steel cylinder after welding in the present invention.

[0025] Figure 4It is a schematic diagram of the processing of the cylinder connection hole area in the present invention.

[0026] In the figure: 1. Cylinder accessories; 2. Cylinder; 3. Stainless steel cylinder; 11. First welding groove; 21. Liquid hole; 22. Connection hole; 23. Second welding groove; 24. Stainless steel plug. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described in detail below through specific implementation methods.

[0028] like Figure 1-Figure 4 As shown, a welding method for cylinder accessories of a hydraulic support suitable for various media is provided. The material of the cylinder accessories is stainless steel, and the material of the cylinder is non-stainless steel. In this embodiment, the cylinder accessories are described by taking the joint seat as an example. The material of the cylinder is a conventional alloy material, such as 27SiMn, 30CrMnSi and other alloy structural cylinders, including the following parts: Part I: A stainless steel cylinder 3 is welded at the inner hole of one end of the cylinder accessory 1 for connecting to the cylinder 2 , and the diameter of the stainless steel cylinder 3 is larger than the designed inner diameter of the liquid through hole 21 on the side wall of the cylinder 2 .

[0029] During the specific processing, the first welding groove 11 is pre-processed at the inner hole of one end of the cylinder accessory 1 used to connect the cylinder, and then the stainless steel cylinder is welded based on the first welding groove 11. The material of the weld is also stainless steel. The formed stainless steel weld needs to be polished and smooth to ensure that the weld does not protrude and there is no leakage.

[0030] The specific size of the stainless steel cylinder 3 exceeds the design size of the liquid hole 21 on the side wall of the cylinder 2 by 2-3 mm, the purpose of which is to leave room for the wall thickness of the liquid hole 21 for later processing, so that the wall material of the entire liquid hole is stainless steel.

[0031] The inner hole of the cylinder 2 is rough-machined. Specifically, the end face of the cylinder 2 is leveled first, and the inner hole of the cylinder is machined to the size of фD before anti-corrosion treatment. The ф(D+2) section is also temporarily machined to the size of фD before anti-corrosion treatment. The connecting hole 22 and the second welding groove 23 are machined on the cylinder wall according to the drawing. The diameter of the connecting hole 22 matches the diameter of the stainless steel cylinder 3.

[0032] In this step, the portion of the stainless steel cylinder 3 that protrudes beyond the inner wall of the cylinder is cut off and flush with the inner wall of the cylinder.

[0033] Part II: The cylinder accessory 1 is welded to the connecting hole 22 of the side wall of the cylinder 2. The weld on the inner wall of the cylinder 2 is formed by welding with stainless steel, and the corner weld on the outer wall of the cylinder 2 is welded with ordinary high-strength welding wire, so that the inner hole on the right side of the cylinder 2 is processed continuously, the processability is improved, and the tool life is extended.

[0034] Further process the inner hole of the cylinder 2 to the size before the anti-corrosion treatment. Specifically, it mainly includes processing the inner hole (ф(D+2) section and the thread section on the right side of the cylinder to the size before the anti-corrosion treatment.

[0035] Align with the original liquid through hole of cylinder accessory 1, drill the liquid through hole through the side wall of the cylinder based on the stainless steel cylinder, and grind the inner wall of the liquid through hole on the side wall of the cylinder to remove burrs.

[0036] In this step, the specific formation process of the liquid hole 21 is to drill a hole in the central area of ​​the original stainless steel cylinder 3, and retain a wall thickness of 1-1.5mm on the outside as the side wall of the liquid hole, so that the inner wall of the cylinder and the connecting area of ​​the liquid hole are both made of stainless steel, which can perfectly transition with the anti-corrosion layer, thereby achieving 100% full protection of the cylinder liquid contact area.

[0037] After the liquid hole is processed, the stainless steel plug 24 is installed and welded with stainless steel material to ensure that there is no leakage.

[0038] Finally, the inner hole of the cylinder is treated with anti-corrosion treatment to make it reach the design size of the anti-corrosion treatment to ensure that the inner hole of the cylinder meets the size required by the drawing.

[0039] In other embodiments, the cylinder accessory may also be a control valve seat or a liquid passage pipe.

[0040] In general, the present invention not only replaces the material of cylinder accessories such as the joint seat with stainless steel, but also transforms the liquid through hole welding area on the cylinder side wall to which the cylinder accessories are connected into a stainless steel structure, so that the liquid through hole area of ​​the cylinder does not need additional anti-corrosion treatment, thereby solving the problem in the traditional solution that the fitting surface between the cylinder accessory and the cylinder wall is a treatment blind area, the surface roughness of the liquid through hole is difficult to control, and it is difficult to control the quality of the anti-corrosion treatment, which causes rust and leads to failure of the hydraulic cylinder.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A welding method for cylinder accessories of a hydraulic support suitable for various media, characterized in that: The material of the cylinder barrel accessories is stainless steel, and the material of the cylinder barrel is non-stainless steel, including the following parts: Part I: A stainless steel cylinder is welded at the inner hole of one end of the cylinder accessory for connecting to the cylinder, and the diameter of the stainless steel cylinder is larger than the designed inner diameter of the liquid through hole on the side wall of the cylinder; The inner hole of the cylinder is roughly machined, and a connecting hole and a welding groove are machined on the cylinder wall of the cylinder, wherein the diameter of the connecting hole matches the diameter of the stainless steel cylinder; Part II: The cylinder accessories are welded to the connection holes on the cylinder side wall, and the weld on the inner wall of the cylinder is formed by welding with stainless steel; Further process the inner bore of the cylinder to the size before anti-corrosion treatment; Align the original liquid hole of the cylinder barrel accessories, drill the liquid hole through the side wall of the cylinder barrel based on the stainless steel cylinder, and grind the inner wall of the liquid hole on the side wall of the cylinder barrel to remove burrs; Part III: Carry out anti-corrosion treatment on the inner hole of the cylinder to make it reach the design size of anti-corrosion treatment.

2. The welding method for cylinder accessories of a hydraulic support adapted to various media according to claim 1 is characterized in that: In the first part, the cylinder accessory is used to connect the inner hole of one end of the cylinder and a welding groove is pre-processed, and the stainless steel cylinder is welded based on the welding groove. The weld here is formed by stainless steel welding and polished to ensure that the weld is not protruding and there is no leakage.

3. The welding method for cylinder accessories of a hydraulic support adapted to various media according to claim 1 or 2, characterized in that: In the first part, the diameter of the stainless steel cylinder is 2-3 mm larger than the designed inner diameter of the liquid hole on the side wall of the cylinder.

4. The welding method for cylinder accessories of a hydraulic support adapted to various media according to claim 1 or 2 is characterized in that: In the second part, the fillet weld of the outer wall of the cylinder is welded with ordinary high-strength welding wire.

5. The welding method for cylinder accessories of a hydraulic support adapted to various media according to claim 1 or 2 is characterized in that: The cylinder accessories are a joint seat, a control valve seat or a liquid pipe.

6. The welding method for cylinder accessories of a hydraulic support adapted to various media according to claim 1 or 2, characterized in that: The cylinder barrel accessory is a joint seat. In the third part, the liquid through hole of the joint seat is aligned and drilled through the liquid through hole of the cylinder barrel side wall, and the outer end of the liquid through hole of the joint seat is blocked with a stainless steel plug and welded.

7. The welding method for cylinder accessories of a hydraulic support adapted to various media according to claim 1 or 2, characterized in that: In the second part, after the cylinder accessories are welded, the end face of the cylinder is leveled and the inner diameters of each section in the cylinder are processed to the same size.

8. The welding method for cylinder accessories of a hydraulic support adapted to various media according to claim 7 is characterized in that: In the third part, before the anti-corrosion treatment, the inner diameters of different sections in the cylinder are processed to the designed dimensions before the anti-corrosion treatment.

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