A manufacturing method of a high-strength triple offset butterfly valve

Abstract

The application discloses a manufacturing method of a high-strength three-eccentric butterfly valve, and comprises the following steps: (1) casting and forming a valve body; (2) removing surface burrs; (3) placing the valve body on a positioning tool of a drilling device to be fixed in orientation; (4) rotating a middle shaft core before drilling, and driving the front end of a drilling and grinding assembly to be attached by a conversion mechanism, so that the drilling and grinding tool bit is formed into a conical shape, and drilling and grinding processing is realized; (5) after the drilling and grinding processing is completed, the middle shaft core is rotated, the front end of the drilling and grinding assembly is separated by the conversion mechanism, so that the drilling and grinding tool bit is cylindrical when rotating, and the polishing convex patterns on the outer surface of the drilling and grinding assembly polish the connecting holes drilled; and (6) performing sand blasting and rust-proof treatment. According to the method, the two sides of the valve body are drilled at the same time, the disassembly and assembly times of the valve body are reduced, and manufacturing and processing are more convenient. Moreover, the coaxiality of the connecting holes is higher, the valve rod is more accurately and firmly installed, the use stability of the valve rod is improved, and then the overall use strength and structural strength of the three-eccentric butterfly valve are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to butterfly valve manufacturing technical field, specifically relates to a kind of high-strength three eccentric butterfly valve manufacturing method. BACKGROUND

[0002] Valve stem axis is offset from the center of the disc and the center of the body, and the valve seat axis of rotation and the valve body passage axis have a certain angle, which is called three eccentric butterfly valve, when the flow needs to be controlled, three eccentric butterfly valve is used.

[0003] Three eccentric butterfly valve mainly includes valve body, valve stem, valve seat and valve flap, the middle part of valve body is provided with the liquid passage for installing valve seat, valve stem is connected through valve body rotation, valve flap is connected on valve body and is used to block valve seat and liquid passage. The existing three eccentric butterfly valve manufacturing is mainly that valve body is formed by casting process, then valve body is positioned and clamped on drilling device, drilling device is first drilled on one side of valve body to connect hole for valve stem, then valve body is removed and positioned and clamped on drilling device after rotating 180 degrees, then drilling device continues to drill the connecting hole on the other side of valve body. However, the above-mentioned manufacturing method of three eccentric butterfly valve needs to disassemble and assemble valve body several times in drilling process, which can easily affect the coaxiality of the connecting hole on both sides, so that the valve stem is subjected to greater radial stress when connected, which causes the valve stem to be unable to smoothly drive the valve flap to rotate, and the valve flap and the valve seat are stuck, thereby affecting the structure and use strength of butterfly valve.

[0004] Therefore, the present application is produced in view of the above-mentioned problems. SUMMARY

[0005] The main purpose of the present application is to provide a kind of high-strength three eccentric butterfly valve manufacturing method, which can effectively solve the above technical problems.

[0006] In order to achieve the above-mentioned purpose, the solution of the present application is:

[0007] A kind of high-strength three eccentric butterfly valve manufacturing method, comprising the following steps:

[0008] (1) by special mold, valve body is formed by casting, and the sand on the surface of valve body is cleaned;

[0009] (2) the inner wall and the outer wall of valve body are polished, and surface burrs are removed;

[0010] (3) the valve body is placed on the positioning tool of drilling device, the positioning tool is oriented and clamped to fix valve body;

[0011] (4) The drilling device has drilling mechanisms on both sides, and the drilling mechanisms are provided with drill grinding heads. The drill grinding heads on both sides are coaxially arranged. The drill grinding head comprises a conversion mechanism, a middle shaft core and a plurality of drill grinding assemblies arranged around the middle shaft core. The outer surface of the drill grinding assembly is provided with a polishing ridge. The lower end of the drill grinding assembly is provided with a connecting block, which is rotationally connected with the middle shaft core. The middle shaft core rotates before drilling. The conversion mechanism drives the front end of the drill grinding assembly to adhere, so that the drill grinding head forms a conical shape, and drilling processing is realized.

[0012] (5) After the drilling processing is completed, the middle shaft core rotates, the conversion mechanism drives the front end of the drill grinding assembly to separate, so that the drill grinding head rotates in a cylindrical shape, and the polishing ridge on the outer surface of the drill grinding assembly polishes the connecting hole drilled.

[0013] (6) The valve body is removed for sand blasting and rust prevention treatment, and then the valve seat, valve flap and valve rod are installed on the valve body.

[0014] Further, the drilling device further comprises a rack, and a positioning tool is installed on the rack. The drilling mechanism is arranged on the rack and symmetrically arranged on both sides of the positioning tool. The positioning tool is provided with a positioning groove for embedding the valve body.

[0015] Further, the outer surface of the drill grinding assembly is further provided with a chip removal groove.

[0016] Further, the drilling mechanism further comprises a guide rail, a translation plate, a first air cylinder, a motor and an adapter sleeve. The guide rail is symmetrically arranged on both sides of the positioning tool. The translation plate is slidingly connected with the guide rail. The power output end of the first air cylinder is connected with the translation plate and drives the horizontal movement of the translation plate. The motor is installed on the translation plate. The power output end of the motor is connected with the adapter sleeve. The adapter sleeve is connected with the middle shaft core.

[0017] Further, the conversion mechanism comprises an adjusting block, a spring, a second air cylinder and a gas guide pipe. The lower end of the drill grinding assembly is provided with an adjusting part, and an adjusting cavity is formed in the adjusting part. The adjusting block is slidingly connected in the adjusting cavity. The outer side of the adjusting block is provided with a sealing ring which is attached to the inner wall of the adjusting cavity. The adjusting block and the rear wall of the adjusting cavity form a driving cavity. One end of the spring is fixedly connected with the front wall of the adjusting cavity. The other end of the spring is abuttingly connected with the adjusting block. The second air cylinder is installed on the adapter sleeve. The second air cylinder and the driving cavity are connected through the gas guide pipe.

[0018] Further, the pressure generated by the second air cylinder is always greater than the compression force generated by the spring.

[0019] Further, the conversion mechanism comprises a connecting rod, a threaded sleeve and a connecting sleeve, the middle shaft core is provided with a threaded section, the threaded sleeve is threadedly connected with the threaded section, the two ends of the threaded sleeve are locked and fixed through nuts, the threaded sleeve is provided with an annular groove, the connecting sleeve is rotatably connected on the annular groove, the drill grinding assembly and the connecting sleeve are provided with connecting grooves, the connecting grooves are provided with connecting shafts, and the two ends of the connecting rod are rotatably connected with the connecting shafts.

[0020] Compared with the prior art, the beneficial effects are that the method simultaneously drills the two sides of the valve body through the drilling device, reduces the disassembly and assembly times of the valve body, and is more convenient to manufacture and process. The drill grinding heads on the two sides are coaxially arranged, the coaxiality of the connecting holes drilled on the two sides is higher, the valve rod is more accurately and firmly installed, thereby the use stability of the valve rod is improved, and the overall use strength and structural strength of the three-eccentric butterfly valve are improved. In addition, the drill grinding head can further polish the connecting hole after drilling the connecting hole, improve the surface quality of the connecting hole, and enable the valve rod to rotate more stably. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a perspective view of the shape structure of the drilling device.

[0022] Figure 2 It is a structure schematic view when the drill grinding head drills.

[0023] Figure 3 It is a sectional structure schematic view of the drill grinding head in the first embodiment.

[0024] Figure 4 It is a structure schematic view when the drill grinding head polishes.

[0025] Figure 5 It is a sectional structure schematic view of the drill grinding head in the second embodiment.

[0026] In the drawings:

[0027] The rack 1, the positioning tool 2, the drilling mechanism 3, the drill grinding head 4, the middle shaft core 41,

[0028] The threaded section 411, the drill grinding assembly 42, the polishing convex 421, the connecting block 422,

[0029] The adjusting cavity 423, the driving cavity 424, the guide rail 51, the translation plate 52, the first air cylinder 53, the motor 54, the adapter sleeve 55, the adjusting block 61, the spring 62, the second air cylinder 63,

[0030] The air guide pipe 64, the connecting rod 71, the threaded sleeve 72, the connecting sleeve 73. DETAILED DESCRIPTION

[0031] To further explain the technical solution of the present invention, the present invention will be described in detail below through specific embodiments.

[0032] like Figures 1-5 As shown, a method for manufacturing a high-strength triple eccentric butterfly valve includes the following steps:

[0033] (1) The valve body is cast and molded using a special mold, and the sand and gravel on the surface of the valve body are cleaned.

[0034] (2) Grind the inner and outer walls of the valve body to remove surface burrs;

[0035] (3) Place the valve body on the positioning fixture 2 of the drilling device. The positioning fixture 2 orients and clamps the valve body.

[0036] (4) The drilling device has drilling mechanisms 3 on both sides. The drilling mechanism 3 is equipped with a grinding head 4. The grinding heads 4 on both sides are coaxially arranged. The grinding head 4 includes a conversion mechanism, a central core 41 and several grinding components 42 arranged around the central core 41. The outer surface of the grinding component 42 is provided with grinding texture 421. The lower end of the grinding component 42 is provided with a connecting block 422. The connecting block 422 is rotatably connected to the central core 41. Before drilling, the central core 41 rotates. The conversion mechanism drives the front end of the grinding component 42 to fit together, so that the grinding head 4 forms a cone shape, thereby realizing drilling.

[0037] (5) After the drilling is completed, the central core 41 rotates and the conversion mechanism drives the front end of the drilling and grinding assembly 42 to separate, so that the drilling and grinding head 4 rotates into a cylindrical shape, and the grinding texture 421 on the outer surface of the drilling and grinding assembly 42 grinds the drilled connecting hole.

[0038] (6) Remove the valve body for sandblasting and rust prevention, and then install the valve seat, valve disc and valve stem on the valve body.

[0039] Specifically, the drilling device also includes a frame 1, a positioning fixture 2 mounted on the frame 1, and a drilling mechanism 3 mounted on the frame 1 and symmetrically arranged on both sides of the positioning fixture 2. The positioning fixture 2 has a positioning groove for the valve body to be embedded. During processing, the valve body can be placed horizontally in the positioning groove, and then the valve body can be pressed by a clamping cylinder to position and fix the orientation of the valve body.

[0040] Specifically, the outer surface of the drilling assembly 42 is also provided with chip removal grooves. The chip removal grooves help to remove waste chips when the drilling head 4 is drilling.

[0041] Specifically, the drilling mechanism 3 further comprises guide rails 51, a translation plate 52, a first air cylinder 53, a motor 54 and an adapter sleeve 55. The guide rails 51 are symmetrically arranged on both sides of the positioning tool 2. The translation plate 52 is in sliding connection with the guide rails 51. The power output end of the first air cylinder 53 is connected with the translation plate 52 and drives the horizontal movement of the translation plate 52. The motor 54 is installed on the translation plate 52. The power output end of the motor 54 is connected with the adapter sleeve 55. The adapter sleeve 55 is connected with the middle shaft core 41. After the above structure is adopted, the first air cylinder 53 drives the translation plate 52 to move horizontally along the guide rails 51, thereby driving the motor 54 and the drill grinding bit 4 to approach or move away from the valve body. The motor 54 can drive the drill grinding bit 4 to rotate, so as to drill and polish the valve body.

[0042] As a first embodiment of the present application, as shown in Figures 2-4 The drilling and grinding assembly 42 is provided with three drill grinding assemblies 42. The conversion mechanism comprises an adjusting block 61, a spring 62, a second air cylinder 63 and a gas guide pipe 64. The lower end of the drilling and grinding assembly 42 is provided with an adjusting part. An adjusting cavity 423 is formed in the adjusting part. The adjusting block 61 is in sliding connection with the adjusting cavity 423. A sealing ring is arranged on the outer side of the adjusting block 61 and is in abutment with the inner wall of the adjusting cavity 423. A driving cavity 424 is formed between the adjusting block 61 and the rear side wall of the adjusting cavity 423. One end of the spring 62 is fixedly connected with the front side wall of the adjusting cavity 423. The other end of the spring 62 is in abutment connection with the adjusting block 61. The second air cylinder 63 is installed on the adapter sleeve 55. The second air cylinder 63 is connected with the driving cavity 424 through the gas guide pipe 64. The pressure generated by the second air cylinder 63 is always greater than the compression force generated by the spring 62. After the above structure is adopted, the second air cylinder 63 can deliver gas into the driving cavity 424 to generate gas pressure to push the adjusting block 61. The adjusting block 61 slides in the adjusting cavity 423. The other end of the adjusting block 61 is in abutment through the spring 62, so as to adjust and fix the position of the adjusting block 61. When the position of the adjusting block 61 changes, the center of gravity of the drilling and grinding assembly 42 can be adjusted. When drilling, the second air cylinder 63 is closed. The spring 62 abuts the adjusting block 61 to the rear end of the adjusting cavity 423. When the middle shaft core 41 rotates, the rear end of the drilling and grinding assembly 42 deviates outward and the front end of the drilling and grinding assembly 42 approaches each other under the action of the rotating centrifugal force, so that the drill grinding bit 4 forms a conical shape. When polishing, the second air cylinder 63 drives the adjusting block 61 to move to the front end of the adjusting cavity 423. When the middle shaft core 41 rotates, the front end of the drilling and grinding assembly 42 deviates under the action of the centrifugal force due to the high-speed rotation, so that the drill grinding bit 4 rotates in a cylindrical shape. The polishing ridges 421 on the drilling and grinding assembly 42 can polish the connecting holes, so as to improve the processing quality of the connecting holes.

[0043] As a second embodiment of the present application, as shown in Figure 5As shown, the conversion mechanism includes a connecting rod 71, a threaded sleeve 72 and a connecting sleeve 73, the middle shaft core 41 is provided with a threaded section 411, the threaded sleeve 72 is threadedly connected with the threaded section 411, both ends of the threaded sleeve 72 are locked and fixed through nuts, the threaded sleeve 72 is provided with an annular groove, the connecting sleeve 73 is sleeved on the annular groove and is rotationally connected, the drill grinding assembly 42 and the connecting sleeve 73 are provided with connecting grooves, connecting shafts are arranged in the connecting grooves, both ends of the connecting rod 71 are rotationally connected with the connecting shafts. After the above structure is adopted, the state of the drill grinding assembly 42 can be adjusted by adjusting the position of the threaded sleeve 72 on the threaded section 411. When the threaded sleeve 72 is close to the side of the drill grinding assembly 42, the connecting rod 71 lifts the rear end of the drill grinding assembly 42, at this time, the front ends of the drill grinding assembly 42 are close to each other, when the middle shaft core 41 rotates, the drill grinding bit 4 forms a conical shape for drilling processing. When the threaded sleeve 72 is away from the drill grinding assembly 42, the connecting rod 71 can drive the rear end of the drill grinding assembly 42 to swing downward, so that the front ends of the drill grinding assembly 42 are separated from each other, when the middle shaft core 41 rotates, the drill grinding bit 4 is in a cylindrical shape for grinding processing. And the taper of the drill grinding bit 4 when drilling can be adjusted by adjusting the position of the threaded sleeve 72, so that it is suitable for drilling connection holes of different sizes, is more flexible to use and has stronger applicability.

[0044] Compared with the prior art, the beneficial effects are that the method of the present application simultaneously drills the two sides of the valve body through the drilling device, reduces the disassembly and assembly times of the valve body, and is more convenient to manufacture and process. The drill grinding bits 4 on the two sides are coaxially arranged, so that the coaxiality of the connection holes drilled on the two sides is higher, the valve rod is more accurately and firmly installed, thereby improving the use stability of the valve rod and the overall use strength and structural strength of the three-eccentric butterfly valve. In addition, the drill grinding bit 4 can further grind the connection hole after drilling the connection hole, improve the surface quality of the connection hole, and make the valve rod rotation more stable.

[0045] The above embodiments and drawings do not limit the product form and style of the present application, and any appropriate changes or modifications made by those skilled in the art shall be considered as not departing from the patent scope of the present application.

Claims

1. A method for manufacturing a high-strength triple eccentric butterfly valve, characterized in that, Includes the following steps: (1) The valve body is cast using a special mold and the sand and gravel on the surface of the valve body are cleaned. (2) Grind the inner and outer walls of the valve body to remove surface burrs; (3) Place the valve body on the positioning fixture of the drilling device. The positioning fixture orients and clamps the valve body. (4) The drilling device has drilling mechanisms on both sides, and the drilling mechanisms are equipped with drilling heads. The drilling heads on both sides are coaxially arranged. The drilling head includes a conversion mechanism, a central core, and several drilling components arranged around the central core. The outer surface of the drilling component is provided with grinding textures. The lower end of the drilling component is provided with a connecting block. The connecting block is rotatably connected to the central core. Before drilling, the central core rotates, and the conversion mechanism drives the front end of the drilling component to fit together, so that the drilling head forms a cone shape to realize drilling. (5) After the drilling is completed, the central core rotates and the conversion mechanism drives the front end of the drilling and grinding assembly to separate, so that the drilling and grinding head is cylindrical when it rotates, and the grinding texture on the outer surface of the drilling and grinding assembly grinds the drilled connecting hole. (6) Remove the valve body for sandblasting and rust prevention, then install the valve seat, valve disc, and valve stem onto the valve body; The drilling mechanism further includes a guide rail, a translation plate, a first cylinder, a motor, and an adapter sleeve. The guide rail is symmetrically arranged on both sides of the positioning fixture. The translation plate is slidably connected to the guide rail. The power output end of the first cylinder is connected to the translation plate and drives the translation plate to move horizontally. The motor is mounted on the translation plate, and the power output end of the motor is connected to the adapter sleeve, which is connected to the central shaft. The conversion mechanism includes an adjusting block, a spring, a second cylinder, and an air guide pipe. The lower end of the drilling assembly is provided with an adjusting part, and an adjusting cavity is opened in the adjusting part. The adjusting block is slidably connected in the adjusting cavity. A sealing ring is provided on the outer side of the adjusting block to fit against the inner wall of the adjusting cavity. A driving cavity is formed between the adjusting block and the rear side wall of the adjusting cavity. One end of the spring is fixedly connected to the front side wall of the adjusting cavity, and the other end of the spring is abutted against the adjusting block. The second cylinder is mounted on the adapter sleeve, and the second cylinder is connected to the driving cavity through the air guide pipe. The pressure generated by the second cylinder is always greater than the compressive force generated by the spring.

2. The method for manufacturing a high-strength triple eccentric butterfly valve as described in claim 1, characterized in that, The drilling device also includes a frame, a positioning fixture is mounted on the frame, the drilling mechanism is located on the frame and symmetrically arranged on both sides of the positioning fixture, and the positioning fixture is provided with a positioning groove for the valve body to be embedded.

3. The manufacturing method of a high-strength triple eccentric butterfly valve as described in claim 2, characterized in that, The outer surface of the drilling assembly is also provided with chip removal grooves.

4. The manufacturing method of a high-strength triple eccentric butterfly valve as described in claim 1, characterized in that, The conversion mechanism includes a connecting rod, a threaded sleeve, and a connecting sleeve. The central shaft has a threaded section, and the threaded sleeve is threadedly connected to the threaded section. The two ends of the threaded sleeve are locked and fixed by nuts. The threaded sleeve has an annular groove, and the connecting sleeve is fitted onto the annular groove for rotatable connection. The drilling assembly and the connecting sleeve have connecting grooves, and a connecting shaft is provided in the connecting groove. The two ends of the connecting rod are rotatably connected to the connecting shaft.

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