Grinding method for sealing surface of high-pressure pipeline

Abstract

The invention relates to the technical field of cover grinding, in particular to a high-pressure pipeline sealing surface grinding method which comprises the following steps: acquiring a first pipeline shape parameter; the grinding contact surface is machined through a grinding tool based on the first pipeline shape parameter, so that the machined grinding contact surface is coupled with the pipeline sealing surface; and a grinding material is placed on the grinding contact surface of the grinding tool, and the grinding material is tightly attached to the pipeline sealing surface for grinding. According to the grinding method for the sealing surface of the high-pressure pipeline, in the grinding process, uneven contact of the sealing surface caused by local grinding of manual grinding is reduced, additional cost caused by outsourcing machining is reduced, and the grinding tool which is light and not prone to abrasion is adopted; the grinding tool and the pretreatment face of the pipeline sealing face are tightly attached and keep concentric relative movement, treatment of the defects of the treatment face is completed, only grinding materials are consumed in the process, and damage to the grinding tool is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of cover grinding, and particularly to a grinding method for the sealing surface of high-pressure pipelines. Background Art

[0002] Polyolefin products are important basic chemical raw materials and play an important role in the national economy. At the same time, the output of polyolefins is also one of the important indicators to measure the development level of a country's petrochemical industry. At present, China is vigorously developing the high-end polyolefin industrial chain, and the polyolefin market has good prospects. Currently, a large number of polyolefin plants are under construction or about to start construction. As one of the main plants, the process package, detailed design, equipment and components of the core high-pressure part of the LDPE / EVA plant all adopt foreign technologies and products. The high-pressure pipeline system includes four pressure grade systems of PN4000, PN3600, PN1600, and PN500. Among them, the PN3600, PN1600, and PN500 systems are flange-connected, and high-pressure lens gaskets are used as gaskets. In the entire high-pressure system, flange connection pairs account for more than 70% of the entire connection pairs. Their installation quality is the key point of the installation of the entire high-pressure system, and the installation quality of the sealing surface of the lens gasket is the key to ensuring the tightness of the entire system. According to the standard procedure for the installation of the high-pressure system, the connection pairs of the entire high-pressure system are successively subjected to installation and fastening, tightness test, purging, and overall airtightness. The connection pairs need to be disassembled, assembled, and fastened multiple times. Due to multiple fastenings of the pipeline and the lens gasket, the sealing surface will more or less have indentations, wear, and inevitable sealing defects. At present, the treatment of sealing surface defects in the high-pressure system is usually carried out by manual grinding and subcontracting processing. The subcontracting processing period is relatively short, but for the sealing surface of the pipe section, mechanical transportation is required, and the turnover period is long. Most of the pipe sections are prefabricated and supplied in a non-standard state, which requires high requirements for the site and equipment of mechanical processing. The special-shaped pipelines are installed in the structural framework. Once installed, the space is narrow. Subcontracting processing requires demolition, and the demolition workload and difficulty increase significantly, resulting in high construction costs. Manual grinding only has labor costs and is not restricted by space, and the cost is relatively low. However, manual grinding is carried out locally and section by section, which will cause uneven treatment of the sealing surface, and the quality cannot be well guaranteed, and the grinding efficiency is low. Summary of the Invention

[0003] In view of this, the present invention provides a grinding method for the sealing surface of high-pressure pipelines to solve the above technical problems.

[0004] Specifically, the present invention is realized through the following technical solutions:

[0005] The present invention provides a grinding method for the sealing surface of high-pressure pipelines, and the method includes:

[0006] Obtain the first pipeline shape parameters, where the first pipeline shape parameters include the structural shape sub-parameters and the sealing surface size sub-parameters of the high-pressure system pipeline sealing surface;

[0007] Based on the structural shape sub-parameters and the sealing surface size sub-parameters, process the grinding contact surface with a grinding tool so that the processed grinding contact surface is coupled with the pipeline sealing surface;

[0008] Place grinding materials on the grinding contact surface of the grinding tool and closely fit it with the pipeline sealing surface for grinding.

[0009] In some embodiments, the grinding materials are sandpapers of different grades.

[0010] In some embodiments, placing grinding materials on the grinding contact surface of the grinding tool and closely fitting it with the pipeline sealing surface for grinding includes:

[0011] Drive the grinding tool with a handheld low-speed electric tool to grind the pipeline sealing surface.

[0012] In some embodiments, the grinding includes at least one rough grinding and at least one fine grinding.

[0013] In some embodiments, a guiding body for preventing the grinding materials from falling off is provided at the center of the grinding tool.

[0014] In some embodiments, a guiding body for ensuring the concentricity of the relative movement between the grinding tool and the pipeline sealing surface is provided at the center of the grinding tool.

[0015] In some embodiments, the pipeline sealing surface is of a concave structure, and the grinding contact surface of the grinding tool is of a convex structure.

[0016] In some embodiments, the diameter of the guiding body is smaller than the inner diameter of the pipeline.

[0017] In some embodiments, the diameter of the guiding body is 2 - 5 mm smaller than the inner diameter of the pipeline.

[0018] In some embodiments, the guiding body is detachably provided at the grinding end of the grinding tool through screws.

[0019] The technical solution provided by the present invention brings at least the following beneficial effects:

[0020] The high-pressure pipeline sealing surface grinding method provided by the present invention reduces the uneven contact of the sealing surface caused by local grinding in manual grinding during the grinding process and reduces the additional costs caused by outsourcing machining. A portable and non-abrasive grinding tool is used to make the grinding tool closely fit and maintain a concentric relative movement with the pre-treated surface of the pipeline sealing surface, and the defects of the treated surface are processed. Only grinding materials are consumed in this process, and the grinding tool is not damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings herein are incorporated into the specification and form a part of this specification, showing embodiments in accordance with the present invention, and are used together with the specification to explain the principles of the present invention.

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic flow chart of the high-pressure pipeline sealing surface grinding method provided by the embodiments of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0025] For the convenience of understanding the high-pressure pipeline sealing surface grinding method described in this embodiment, the relevant defects of the prior art are elaborated again:

[0026] Existing processing method 1:

[0027] Manual grinding, using sandpaper of the corresponding grade to manually grind the defective part to achieve the purpose of eliminating the defects of the sealing surface.

[0028] Defects of existing processing method 1:

[0029] The advantages of manual grinding are low cost, convenient construction and operation, but the disadvantages are low efficiency. Grinding is only for some minor defects, and it is local grinding. For large defects, local grinding is prone to uneven grinding, which cannot ensure good contact between the lens pad and the pipeline sealing surface, and easily causes discontinuity of the sealing contact surface, affecting the installation quality and increasing the probability of pipeline leakage. If the entire sealing surface is manually ground as a whole, it will take a lot of time, a long cycle, low efficiency and increased costs.

[0030] The second existing processing method: outsourcing factory mechanical processing, using machine tools to process the pipe and lens gasket sealing surface to eliminate surface defects.

[0031] The second defect of the existing processing method:

[0032] The advantages of mechanical processing are good efficiency, a wide range of defects to be treated, and the overall sealing surface treatment, good processing quality. The disadvantage is that the defective parts need to be transported to the processing plant for processing, which is not suitable for on-site construction. For the sealing surface of the special-shaped and installed pipe section, not only is it difficult to remove the pipeline, the corresponding auxiliary removal workload increases sharply, the on-site implementation and operability are poor, and when the defects of the sealing surface of the special-shaped pipe section are treated, the processing equipment and tooling need to be re-modified, which is costly.

[0033] Example 1

[0034] Reference Figure 1 As shown, this embodiment provides a method for grinding a sealing surface of a high-pressure pipeline, and the method includes step S100, step S200 and step S300.

[0035] Step S100, obtaining a first pipeline shape parameter, wherein the first pipeline shape parameter includes a structural shape sub-parameter and a sealing surface size sub-parameter of a sealing surface of a high-pressure system pipeline;

[0036] Step S200, machining the grinding contact surface by a grinding tool based on the structural shape sub-parameter and the sealing surface size sub-parameter, so that the machined grinding contact surface is coupled with the pipeline sealing surface;

[0037] Step S300: placing abrasive material on the grinding contact surface of the grinding tool and grinding it so that it fits tightly against the pipeline sealing surface.

[0038] Wherein, the pipeline sealing surface is a concave structure, and the grinding contact surface of the grinding tool is a convex structure.

[0039] In this embodiment, by reducing the uneven contact of the sealing surface caused by local grinding by manual grinding during the grinding process and reducing the additional costs caused by outsourcing machining, a lightweight and non-abrasive grinding tool is used, so that the grinding tool and the pre-treated surface of the pipeline sealing surface are closely attached and maintain a concentric relative movement to complete the treatment of the defects on the treated surface. Only grinding materials are consumed in this process, and the grinding tool is not damaged.

[0040] Embodiment 2

[0041] This embodiment is based on Embodiment 1. The grinding materials are sandpapers of different grades. The sandpaper materials in this embodiment can be selected according to the materials of the pipelines to be processed. Secondly, there are also differences in the sandpaper materials used for rough grinding and fine grinding. Specifically:

[0042] Dry sandpaper uses synthetic resin as the binder to bond silicon carbide abrasive on latex and is coated with an antistatic coating to make high-grade products. It has the advantages of anti-clogging, anti-static, good softness, high wear resistance, etc. There are a variety of finenesses available for selection, suitable for grinding metal surfaces, putty and coatings. Dry sandpaper generally selects special kraft paper and latex paper, uses natural and synthetic resins as binders, and is manufactured by an advanced high-static electricity sand planting process. This product has high grinding efficiency and is not easy to stick chips, etc., and is suitable for dry grinding, such as the rough grinding of pipelines in the early stage.

[0043] Water sandpaper, also known as waterproof sandpaper or wet sandpaper, gets its name because it can be immersed in water or ground in water during use. Water sandpaper is a kind of abrasive tool made by using water-resistant paper or paper treated to be water-resistant as the base, and using paint or resin as the binder to firmly bond corundum or silicon carbide abrasive on the base. Its shapes are of two types: sheet-shaped and roll-shaped. It can be divided into: brown corundum sandpaper; white corundum sandpaper; silicon carbide sandpaper; zirconium corundum sandpaper, etc. according to the abrasive. It can be divided into: ordinary binder sandpaper; resin binder sandpaper according to the binder. Water sandpaper has a finer texture. Water sandpaper is suitable for grinding some things with finer textures and is suitable for post-processing. The gaps between the sand grains of water sandpaper are smaller, and the ground powder is also smaller. When used with water, the powder will flow out with the water. Therefore, it must be used with water. If water sandpaper is used for dry grinding, the powder will remain in the gaps between the sand grains, making the surface of the sandpaper smooth and thus failing to achieve its original effect. While dry sandpaper is not so troublesome. The gaps between its sand grains are larger, and the ground powder is also larger. During the grinding process, due to the large gaps, the powder will fall off. Therefore, it does not need to be used with water and is suitable for fine grinding in pipeline grinding.

[0044] Embodiment 3

[0045] This embodiment is based on Embodiment 1. Grinding materials are placed on the grinding contact surface of the grinding tool and are closely attached to the pipeline sealing surface for grinding, including:

[0046] The grinding tool is driven by a handheld low-speed power tool to grind the sealing surface of the pipeline. There are many requirements during the grinding process. For example, the power of the grinding machine is one of the important indicators to measure its performance. Generally, the greater the power of the grinding machine, the better its grinding effect. Therefore, when selecting a grinding machine, it is necessary to determine the required power range according to the specific pipeline size parameters and grinding requirements.

[0047] Secondly, the rotation speed of the grinding machine is also a key indicator. Too high or too low rotation speed will affect the grinding effect. Therefore, it is necessary to determine the appropriate rotation speed range according to the hardness of the grinding material and the grinding requirements. Generally speaking, the preferred rotation speed range can be within 1000 - 1300 revolutions.

[0048] Example 4

[0049] This example is based on Example 3 and is used to further elaborate on relevant matters during the grinding process of the pipeline, such as at least one rough grinding and one fine grinding should be carried out during the grinding process.

[0050] However, there are certain drawbacks in the processing of existing mechanical and electrical accessories. Traditional mechanical and electrical accessories are polished mechanically during processing. Due to the uneven surface thickness of the mechanical and electrical accessories, it is impossible to control the thickness during polishing, resulting in an uneven surface during polishing, which brings inconvenience to use.

[0051] The specific operation steps can be as follows:

[0052] Clean the relevant accessories. First, clean the mechanical and electrical accessories. Put the mechanical and electrical accessories into the cleaning solution for washing. The temperature of the cleaning solution is 30 - 40°C. When washing, wipe the surface of the mechanical and electrical accessories with a cotton cloth. The washing time is 5 - 8 minutes. Then dry the washed mechanical and electrical accessories and place them in a ventilated place for 30 minutes to obtain clean mechanical and electrical accessories; rough and fine grinding. First, use 120-mesh sandpaper to grind the obtained clean mechanical and electrical accessories. After grinding evenly, use 320-mesh dry sandpaper for secondary grinding. The purpose of rough grinding is to remove the burrs and bumps around the accessories, and the purpose of fine grinding is to eliminate the rough surface that appears during rough grinding and further grind the defects; the fine grinding operation is similar to the rough grinding; if there are still a large number of defects and rough grinding wheel marks after one pass, then continue grinding; the amount of grinding can be determined according to the number of defects to obtain the ground mechanical and electrical accessories; polishing and cleaning. Put the obtained ground mechanical and electrical accessories into the polishing solution for polishing, and then put the mechanical and electrical accessories into the water tank of an ultrasonic cleaning machine filled with deionized water at 40 - 50°C. The cleaning duration is 2 - 3 minutes. Take it out and rinse the accessories with clean water 2 - 3 times, and then drain the water and dry it. The drying temperature is 60 - 85°C. Take it out and set it aside for later use, and the high-smoothness grinding method for mechanical and electrical accessories can be completed, and finally, mechanical and electrical accessories with high smoothness are obtained.

[0053] After fine grinding, final grinding is carried out with 480-mesh water sandpaper, and finally the electromechanical parts are dried at 100-120 °C.

[0054] During rough and fine grinding, grinding is carried out in the same direction, for example, in the clockwise direction or in the counterclockwise direction.

[0055] Example 5

[0056] This example is based on Example 1, and a guide body for preventing the grinding material from falling off is provided at the center of the grinding tool.

[0057] Secondly, the guide body can also ensure the concentricity of the relative movement between the grinding tool and the pipe sealing surface.

[0058] Function 1: As a countermeasure against the radial displacement during mechanical rotation, it plays a guiding role.

[0059] Function 2: As a function of fixing the grinding material, the relative movement between the grinding tool and the pipe sealing surface achieves the overall grinding effect, thereby ensuring the grinding quality.

[0060] Example 6

[0061] This example is based on Example 5 and is used to further elaborate on the installation position and dimensional data of the guide body.

[0062] Specifically, the diameter of the guide body is smaller than the inner diameter of the pipe. Preferably, the diameter of the guide body is 2-5 mm smaller than the inner diameter of the pipe, and the guide body is detachably provided at the grinding end of the grinding tool by screws.

[0063] Example 7

[0064] This example provides a high-pressure pipe sealing surface grinding device, and the device includes:

[0065] A first acquisition module for acquiring first pipe shape parameters, where the first pipe shape parameters include structural shape sub-parameters and sealing surface size sub-parameters of the high-pressure system pipe sealing surface;

[0066] A first processing module for processing the grinding contact surface based on the structural shape sub-parameters and the sealing surface size sub-parameters through a grinding tool so that the processed grinding contact surface is coupled with the pipe sealing surface;

[0067] A second processing module for placing a grinding material on the grinding contact surface of the grinding tool and closely fitting it with the pipe sealing surface for grinding.

[0068] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0069] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather will conform to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for grinding the sealing surface of a high-pressure pipeline, characterized in that, the method includes: obtaining the first pipeline shape parameters, which include the structural shape sub-parameters and the sealing surface size sub-parameters of the sealing surface of the high-pressure system pipeline; processing the grinding contact surface through a grinding tool based on the structural shape sub-parameters and the sealing surface size sub-parameters, so that the processed grinding contact surface is coupled with the pipeline sealing surface; placing grinding materials on the grinding contact surface of the grinding tool and closely fitting it with the pipeline sealing surface for grinding.

2. The method for grinding the sealing surface of a high-pressure pipeline according to claim 1, characterized in that, the grinding materials are sandpapers of different grades.

3. The method for grinding the sealing surface of a high-pressure pipeline according to claim 1, characterized in that, placing grinding materials on the grinding contact surface of the grinding tool and closely fitting it with the pipeline sealing surface for grinding includes: driving the grinding tool by a handheld low-speed electric tool to grind the pipeline sealing surface.

4. The method for grinding the sealing surface of a high-pressure pipeline according to claim 3, characterized in that, the grinding includes at least one rough grinding and at least one fine grinding.

5. The method for grinding the sealing surface of a high-pressure pipeline according to claim 1, characterized in that, a guiding body for preventing the grinding materials from falling off is provided at the center of the grinding tool.

6. The method for grinding the sealing surface of a high-pressure pipeline according to claim 1, characterized in that, a guiding body for ensuring the concentricity of the relative movement between the grinding tool and the pipeline sealing surface is provided at the center of the grinding tool.

7. The method for grinding the sealing surface of a high-pressure pipeline according to claim 1, characterized in that, the pipeline sealing surface is of a concave structure, and the grinding contact surface of the grinding tool is of a convex structure.

8. The method for grinding the sealing surface of a high-pressure pipeline according to any one of claims 5-6, characterized in that, the diameter of the guiding body is smaller than the inner diameter of the pipeline.

9. The method for grinding the sealing surface of a high-pressure pipeline according to claim 8, characterized in that, the diameter of the guiding body is 2-5 mm smaller than the inner diameter of the pipeline.

10. The method for grinding the sealing surface of a high-pressure pipeline according to any one of claims 5-6, characterized in that, the guiding body is detachably arranged at the grinding end of the grinding tool by screws.

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