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Valve plug of height adjustment reversing valve and girth welding process thereof for height adjustment system of coal mining machine

A coal shearer and reversing valve technology, which is applied in the direction of mechanical equipment, earth drilling, cutting machinery, etc., can solve the problems of reducing the effective cross-sectional area of ​​the weld, discounting the strength of the weld, and limiting the rotation of the welding torch, etc. The effect of unlimited space, good welding quality and low welding conditions

Active Publication Date: 2011-08-31
XIAN COAL MINING MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Depend on figure 1 It can be seen that the square welding seam 4 between the left core head 2 and the right core head 3 and the valve core body 1 is designed along the axial direction of the valve core body 1, and there are the following practical problems in actual use: on the one hand, the operation space in the welding process Small, the rotation of the welding torch is limited, and the weld is prone to virtual welding and poor fusion; on the other hand, because the weld width is only 2mm, the effective cross-sectional area itself is small, and the root of the square weld cannot Welding to reduce the effective cross-sectional area of ​​the weld, and the strength of the weld will also be compromised
In the actual use process, the welding seam desoldering phenomenon occurred many times, which seriously affected the product quality

Method used

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  • Valve plug of height adjustment reversing valve and girth welding process thereof for height adjustment system of coal mining machine
  • Valve plug of height adjustment reversing valve and girth welding process thereof for height adjustment system of coal mining machine
  • Valve plug of height adjustment reversing valve and girth welding process thereof for height adjustment system of coal mining machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] like figure 2 The height adjustment reversing valve spool for a shearer height adjustment system shown includes a valve core body 1 and two left core heads 2 and right core heads 3 respectively installed at the left and right ends of the valve core body 1, The valve core body 1 is a hollow cylindrical tube, the left core head 2 and the right core head 3 are solid cylindrical rods and the two are arranged coaxially with the valve core body 1, the valve core body 1 and the left core head 2 and the right core The heads 3 are all made of 35CrMo material. The left core head 2 and the right core head 3 are respectively inserted into the inner sides of the left and right ends of the valve core body 1. The installed cylindrical insertion port, the diameter of the cylindrical insertion port is greater than the inner diameter of the valve core body 1, and the inner ends of the left core head 2 and the right core head 3 are all correspondingly arranged to match the cylindrical i...

Embodiment 2

[0058] In this embodiment, the height-adjusting reversing valve spool structure processed is different from Embodiment 1 in that: the transverse width of the annular welding seam one 7 and the annular welding seam two 8 (specifically, the top transverse width Width) is 4mm and the longitudinal depth of the two is 4mm, and the structure and positional relationship of the remaining parts are all the same as in Example 1.

[0059] In this embodiment, the difference in the girth welding process for the girth welding of the spool of the height-adjusting reversing valve from that of Embodiment 1 is that the V-shaped groove angle in step 1 is 50°, and the V-shaped groove angle is 50°. The horizontal width of the top of the mouth is 4mm and its longitudinal depth is 4mm; when preheating before welding in step 2, the surface temperature of the welding part is heated to 310°C and then stop preheating; when actually welding in step 3, the welding current The welding voltage is 190A, the ...

Embodiment 3

[0061] In this embodiment, the height-adjusting reversing valve spool structure processed is different from Embodiment 1 in that: the transverse width of the annular welding seam one 7 and the annular welding seam two 8 (specifically, the top transverse width Width) is 4mm and the longitudinal depth of the two is 4mm, and the structure and positional relationship of the remaining parts are all the same as in Example 1.

[0062] In this embodiment, the girth welding process for the height-adjusting reversing valve spool is different from that of embodiment 1 in that the bevel angle of the V-shaped bevel described in step 1 is 55°, and the V-shaped bevel The horizontal width of the top of the mouth is 4mm and its longitudinal depth is 4mm; when preheating before welding in step 2, the surface temperature of the welding part is heated to 320°C and then stop preheating; when actually welding in step 3, the welding current The welding voltage is 200A, the welding voltage is 17V, an...

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Abstract

The invention discloses a valve plug of a height adjustment reversing valve and a girth welding process thereof for a height adjustment system of a coal mining machine. The valve plug comprises a valve plug body, a left plug head and a right plug head; the left plug head and the right plug head are respectively provided with a left annular boss and a right annular boss the outer diameter of whichare the same with the outer diameter of the valve plug body; and the left annular boss and the valve plug body as well as the right annular boss and the valve plug body are respectively fastened and connected through a circular ring-shaped soldering joint which is arranged along the valve plug body radially. The girth welding process comprises the following steps: 1. groove treatment; 2. preheating before welding; 3. girth welding; and 4. heat preservation after welding. The valve plug and the process provided by the invention have the advantages of reasonable design, simple welding steps, good welding quality and long service life of valve plug manufacturing, are convenient to operate, and multiple actual problems of small operation space, smaller effective welding cross section area, lower strength, poor welding quality and higher rejection rate, is inconvenient to operate, the welding quality of the valve plug is not easy to control and the like in welding for the existing valve plug can be solved effectively.

Description

technical field [0001] The invention belongs to the technical field of processing and manufacturing a height adjustment valve group for a shearer height adjustment system, and in particular relates to a height adjustment reversing valve core and a ring welding process thereof for a coal shearer height adjustment system. Background technique [0002] The shearer height adjustment system is set up to realize the height adjustment needs of the shearer drum. Nowadays, the shearer height adjustment system mostly adopts the hydraulic system, which is usually called the shearer height adjustment hydraulic system. In the actual use process, the hydraulic system of the coal mining machine mainly includes the gear pump, the motor that provides power for the gear pump, the height adjustment cylinder and its hydraulic control valve (ie hydraulic lock, etc.), the height adjustment reversing valve, the high pressure relief valve (safety valve), low pressure relief valve, brake solenoid va...

Claims

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Application Information

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IPC IPC(8): F15B13/02B23K31/00E21C31/08
Inventor 白西训周晓红薛强李荣智
Owner XIAN COAL MINING MACHINERY
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