A high-pressure-resistant composite pipe special cutting circular saw blade

Abstract

The utility model relates to a kind of cutting circular saw blade special for high-pressure composite pipe, including saw blade body, the circumferential side of saw blade body is evenly distributed with several groups of tooth profile, the tooth profile is designed as periodic combination, it is arranged in order as flat tooth-left helical tooth-right helical tooth-left helical tooth-right helical tooth, every 5 teeth a group, the whole circular saw blade is made of 16 groups of teeth total tooth number 80 teeth, the circumferential side of saw blade body is evenly provided with 80 recesses for the insertion of cutter head, the cutter head is welded in the recess by three sides. The main deflection angle ε of left helical tooth and right helical tooth is designed as 5 °, the radial difference Hd of flat tooth, left helical tooth and right helical tooth is designed as 0.2mm. It is mainly used for cutting of high-pressure steel wire winding high-pressure composite pipe (such as mine hydraulic support, oilfield development, engineering construction and other high-pressure hydraulic system in conveying pipeline), significantly reduce cutting resistance, eliminate cutter head fracture, shedding, jam and cracking risk, improve service life and safety.

Description

Technical Field

[0001] This utility model relates to the field of high-pressure resistant composite pipe cutting and processing technology, and in particular to a special circular saw blade for cutting high-pressure resistant composite pipes. Background Technology

[0002] In today's era of rapid technological advancement, all industries are seeking more efficient and safer materials and technologies to improve production efficiency and product quality. High-pressure resistant composite pipes, as a key conveying material, are used in hydraulic supports for mines, oilfield development, engineering construction, lifting and transportation, metallurgical forging, mining equipment, ships, injection molding machinery, agricultural machinery, various machine tools, and in the mechanized and automated hydraulic systems of various industrial sectors to transport petroleum-based liquids (such as mineral oil, soluble oil, hydraulic oil, fuel oil, and lubricating oil) and water-based liquids (such as emulsions, oil-water emulsions, and water) under certain pressure and temperature, as well as in fluid transmission pipelines.

[0003] The high-pressure steel wire wound composite pipe structure mainly consists of an inner rubber layer, a middle rubber layer, four or more layers of alternating steel wire reinforcement layers, and an outer rubber layer. The inner rubber layer allows the conveyed medium to withstand pressure and protects the steel wire from corrosion. The outer rubber layer protects the steel wire from damage, and the steel wire (ф0.3-2.0 reinforcement layer) layer is the skeleton material that provides reinforcement.

[0004] The cutting of high-pressure steel wire wound composite pipe involves placing the pipe into a replaced guide sleeve, and then operating the blade-shaped handle to push the pipe into the saw blade, where it will be cut. When the slide returns to its original position, it is automatically pulled back by two tension springs.

[0005] The main problems with composite pipe cutting are:

[0006] 1. Because there are four or more layers of steel wires wrapped alternately in the middle of the composite pipe, the blade of the traditional circular saw is prone to breakage and detachment when cutting, resulting in a short service life and a significant safety hazard.

[0007] 2. The inner, middle, and outer rubber layers of the composite pipe are made of reinforcing rubber components and have a certain degree of elasticity. When cutting with a traditional circular saw blade, the blade substrate is easily jammed, which brings great cutting resistance to the saw blade and causes it to crack. Utility Model Content

[0008] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a special circular saw blade for cutting high-pressure resistant composite pipes. It is mainly used for cutting high-pressure steel wire wound high-pressure resistant composite pipes (such as conveying pipelines in high-pressure hydraulic systems for mine hydraulic supports, oil field development, and engineering construction). It significantly reduces cutting resistance, eliminates the risk of blade breakage, detachment, jamming, and cracking, and improves service life and safety.

[0009] The above-mentioned utility model objective is achieved through the following technical solution:

[0010] A circular saw blade for cutting high-pressure composite pipes includes a saw blade body. Several sets of teeth are evenly distributed on the periphery of the saw blade body. The teeth are designed in a periodic combination and are arranged in sequence as flat teeth-left oblique teeth-right oblique teeth-left oblique teeth-right oblique teeth, with 5 teeth per group. The entire circular saw blade consists of 16 groups of teeth with a total of 80 teeth. 80 grooves for inserting the cutter head are evenly formed on the periphery of the saw blade body. The cutter head is welded into the grooves on three sides.

[0011] As a further technical solution of this utility model: the principal cutting angle ε of the left helical tooth and the right helical tooth are both designed to be 5°, and the radial difference Hd between the flat tooth and the left helical tooth and the right helical tooth is designed to be 0.2mm.

[0012] As a further technical solution of this utility model: the material of the cutter head is P40 grade, and the composition is 75% tungsten carbide, 12% tantalum carbide + titanium carbide, and 13% cobalt by mass percentage, with a bending strength ≥2300MPa.

[0013] As a further technical solution of this utility model: the tooth height of the tooth profile is 0.7mm.

[0014] As a further technical solution of this utility model: the depth of the groove is 2mm, and the solder is a copper-based material.

[0015] As a further technical solution of this utility model: the total number of teeth of the saw blade body can be expanded to 100 teeth (20 sets of tooth shapes), while other parameters remain unchanged.

[0016] As a further technical solution of this utility model: the diameter of the saw blade body is 200 mm and the thickness is 1.5 mm, which is suitable for cutting high-pressure steel wire wound composite pipes.

[0017] As a further technical solution of this utility model: several thermal expansion grooves are evenly opened on the periphery of the saw blade body.

[0018] In summary, this utility model has at least one of the following beneficial technical effects:

[0019] This utility model discloses a special circular saw blade for cutting high-pressure resistant composite pipes, belonging to the field of high-pressure resistant composite pipe cutting and processing technology. It mainly solves the problems of blade breakage, detachment, jamming, and cracking that easily occur when cutting high-pressure steel wire wound composite pipes using existing circular saw blades. By designing the tooth profile as a periodic combination of flat teeth-left helical teeth-right helical teeth-left helical teeth-right helical teeth (5 teeth per group, 80 teeth in total), with a principal cutting edge angle ε = 5° and a radial difference of 0.2 mm; the welding area adopts an insert-groove design, increasing the welding area by 22% and achieving three-sided welding; the blade material is selected from P40 grade (containing 75% tungsten carbide, 12% tantalum carbide + titanium carbide, and 13% cobalt) with a bending strength ≥2300MPa; the tooth height is set at 0.7 mm. This significantly reduces cutting resistance, eliminates the risk of blade breakage, detachment, jamming, and cracking, and improves service life and safety. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0021] Figure 2 for Figure 1 Side view.

[0022] Figure 3 This is a schematic diagram illustrating the tooth shape of this utility model.

[0023] Figure 4 This is a schematic diagram showing the structure of the cutter head and the groove of this utility model.

[0024] Reference numerals: 1. Saw blade body; 2. Tooth shape; 3. Cutting head; 4. Groove; 5. Thermal expansion groove. Detailed Implementation

[0025] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0026] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] Example 1:

[0029] Reference Figure 1 This utility model discloses a special circular saw blade for cutting high-pressure composite pipes, which includes a saw blade body 1, and several sets of teeth 2 are evenly distributed on the periphery of the saw blade body 1.

[0030] Reference Figure 3 The tooth shape 2 is designed as a periodic combination, arranged in sequence as flat tooth - left oblique tooth - right oblique tooth - left oblique tooth - right oblique tooth, with 5 teeth per group. The entire circular saw blade consists of 16 groups of teeth, with a total of 80 teeth. When cutting, the flat tooth is responsible for cutting the material in the middle, the left oblique tooth is responsible for the material on the left side, and the right oblique tooth is responsible for the material on the right side.

[0031] The principal cutting edge angle ε of both the left and right helical teeth is designed to be 5°, and the radial difference Hd between the flat teeth and the left and right helical teeth is designed to be 0.2mm. This results in a very small cutting amount per tooth, significantly reducing cutting resistance and the risk of breakage or chipping of the cutter head 3. The cutter head 3 is made of P40 grade material, with a composition of 75% tungsten carbide, 12% tantalum carbide and titanium carbide, and 13% cobalt by mass percentage, and a bending strength ≥2300MPa. In actual use, this prevents transverse breakage of the cutter head 3.

[0032] Reference Figure 2 The tooth height of tooth shape 2 is 0.7mm. Designing the tooth height of the circular saw blade to 0.7mm is 0.2mm higher than the traditional design of 0.5mm. This avoids friction between the rubber layer and the circular saw blade, significantly reduces cutting resistance, prevents the circular saw blade from getting stuck, and avoids the risk of the circular saw blade cracking.

[0033] Reference Figure 1 and Figure 4 The saw blade body 1 has 80 evenly spaced grooves 4 for inserting the blade head 3. The blade head 3 is welded into the grooves 4 on three sides. The grooves 4 are 2mm deep, and the solder is a copper-based material. By designing the welding area of ​​the circular saw blade as an insertion groove 4, the welding area is increased by 22% compared to the traditional design. Furthermore, the welding area is welded on three sides, which greatly improves the welding strength and significantly reduces the risk of the blade head 3 falling off.

[0034] The saw blade body 1 has a diameter of 200 mm and a thickness of 1.5 mm, and is suitable for cutting high-pressure steel wire wound composite pipes. Several thermal expansion grooves 5 are evenly formed on the periphery of the saw blade body 1. In this embodiment, there are five thermal expansion grooves 5.

[0035] Shape and structure: see Figure 1 (Circular saw blade overall structure), saw blade diameter 200 mm, thickness 1.5 mm. Tooth shape 2 is arranged in groups of 5 in a periodic pattern (flat tooth - left oblique tooth - right oblique tooth - left oblique tooth - right oblique tooth), with uniform spacing between groups. Welded area ( Figure 2 The groove 4 is 2 mm deep, and after being filled with solder, a three-sided solder layer is formed.

[0036] Materials and Connections: The saw blade base is made of high-speed steel, and the cutter head 3 is welded using copper-based solder; the P40 cutter head 3 is fixed in the insertion groove 4 by brazing.

[0037] Working principle: When cutting high-pressure composite pipe, the composite pipe is pushed within the guide sleeve. The saw teeth disperse the cutting force: flat teeth cut the center of the steel wire layer, while left / right oblique teeth deflect the cutting edge, with a radial difference of 0.2 mm ensuring uniform cutting; a tooth height of 0.7 mm prevents rubber adhesion; P40 material is impact-resistant, and the welded structure is robust. Operation process: Handle pushes → saw teeth cut in → resistance decreases → cutting completes → spring returns to normal.

[0038] This utility model has the following technical effects:

[0039] No breakage or detachment of the cutter head: Improved welding strength and the bending resistance of P40 material reduce the risk of breakage by more than 90%.

[0040] No jamming or cracking: The tooth height and tooth shape design reduces frictional resistance, avoids jamming, and extends the life of the saw blade to twice that of traditional saw blades.

[0041] Overall improvement in safety and efficiency: Suitable for cutting pipelines in high-pressure hydraulic systems, reducing downtime for maintenance.

[0042] Example 2:

[0043] A special circular saw blade for cutting high-pressure composite pipes, which differs from Embodiment 1 in that the total number of teeth on the saw blade body 1 can be expanded to 100 teeth (20 sets of tooth shapes), while other parameters remain unchanged.

[0044] The implementation principle of this utility model is as follows: This utility model discloses a special circular saw blade for cutting high-pressure resistant composite pipes, belonging to the field of high-pressure resistant composite pipe cutting and processing technology. It mainly solves the problem of existing circular saw blades easily experiencing breakage, detachment, jamming, and cracking of the cutter head 3 when cutting high-pressure steel wire wound composite pipes. By designing the tooth shape 2 as a periodic combination of flat teeth - left helical teeth - right helical teeth - left helical teeth - right helical teeth (each group of 5 teeth, totaling 80 teeth), with a principal cutting angle ε = 5° and a radial difference of 0.2 mm; the welding area adopts an insert-type groove design 4, increasing the welding area by 22% and achieving three-sided welding; the cutter head 3 material is selected from P40 grade (containing 75% tungsten carbide, 12% tantalum carbide + titanium carbide, and 13% cobalt) with a bending strength ≥2300MPa; the tooth height is set to 0.7 mm. This significantly reduces cutting resistance, eliminates the risk of cutter head 3 breakage, detachment, jamming, and cracking, and improves service life and safety.

[0045] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A circular saw blade for cutting high-pressure composite pipes, comprising a saw blade body (1), characterized in that, The saw blade body (1) has several sets of teeth (2) evenly distributed around its periphery. The teeth (2) are designed to be periodically combined and arranged in sequence as flat teeth - left oblique teeth - right oblique teeth - left oblique teeth - right oblique teeth, with 5 teeth per group. The entire circular saw blade consists of 16 groups of teeth with a total of 80 teeth. The saw blade body (1) has 80 grooves (4) evenly opened around its periphery for inserting the cutting head (3). The cutting head (3) is welded into the grooves (4) on three sides.

2. The high-pressure resistant composite pipe cutting circular saw blade according to claim 1, characterized in that, The principal cutting angle ε of both the left and right helical teeth is designed to be 5°, and the radial difference Hd between the flat tooth and the left and right helical teeth is designed to be 0.2 mm.

3. The circular saw blade for cutting high-pressure composite pipes according to claim 1, characterized in that, The material of the cutter head (3) is P40 grade, and its composition is 75% tungsten carbide, 12% tantalum carbide + titanium carbide, and 13% cobalt by mass percentage, with a bending strength ≥2300MPa.

4. The high-pressure resistant composite pipe cutting circular saw blade according to claim 1, characterized in that, The tooth height of the tooth profile (2) is 0.7 mm.

5. The high-pressure resistant composite pipe cutting circular saw blade according to claim 1, characterized in that, The groove (4) has a depth of 2 mm and the solder is a copper-based material.

6. The high-pressure resistant composite pipe cutting circular saw blade according to claim 1, characterized in that, The total number of teeth on the saw blade body (1) can be expanded to 100 teeth.

7. The high-pressure resistant composite pipe cutting circular saw blade according to claim 1, characterized in that, The saw blade body (1) has a diameter of 200 mm and a thickness of 1.5 mm, and is suitable for cutting high-pressure steel wire wound composite pipes.

8. The high-pressure resistant composite pipe cutting circular saw blade according to claim 1, characterized in that, The saw blade body (1) has several thermal expansion grooves (5) evenly distributed around its periphery.

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