Rotary drum for machining valve shaft and shaft hole of ball valve of water turbine

Abstract

The invention discloses a rotary drum for machining a valve shaft and a shaft hole of a water turbine ball valve, belongs to the technical field of machining, and aims to solve the problems that an existing rotary drum for machining the water turbine ball valve is too heavy and the like. The rotary cylinder is a cylindrical component with one end provided with a sealed end wall, a first concave spigot is formed in the outer end face of the sealed end wall, a second through hole, two key-shaped holes, a plurality of first through holes and a plurality of first threaded holes are formed in the sealed end wall, and a plurality of third through holes are formed in the circumferential wall of the rotary cylinder. Two trapezoidal notches are formed in the edge of the opening end of the rotary cylinder, two mounting parts are formed between the two trapezoidal notches in the circumferential direction, the trapezoidal notches, the first through hole, the second through hole and the third through hole can reduce the weight of the rotary cylinder, and then the load burden of the boring machine is reduced; and the trapezoidal notch and the plurality of third through holes can ensure that scrap iron generated by machining can be smoothly removed.

Description

Technical Field

[0001] This invention belongs to the field of mechanical processing technology, and in particular relates to a rotary cylinder for machining the valve shaft and shaft hole of a water turbine ball valve. Background Technology

[0002] Ball valves are core components of hydroelectric turbine units, used to control the flow of water. The efficiency and quality of ball valve manufacturing directly affect the unit's commissioning time and operational safety. Currently, the machining of ball valve shafts and bores involves directly connecting a rotary drum to the machine tool spindle. This rotary drum is excessively heavy, and its weight and cutting forces are borne by the machine tool spindle. Consequently, the current machining process for valve shafts and bores suffers from problems such as shallow cutting depth, long machining cycles, low cutting speeds, poor machining quality, and significant wear and short lifespan of the machine tool spindle bearings. Summary of the Invention

[0003] The purpose of this invention is to provide a rotary cylinder for machining the valve shaft and shaft hole of a water turbine ball valve, thereby solving the problem of excessive weight in existing rotary cylinders used for machining water turbine ball valves. The technical solution adopted by this invention is as follows:

[0004] A rotary cylinder for machining the valve shaft and shaft hole of a water turbine ball valve is disclosed. The rotary cylinder is a cylindrical component with a sealed end wall at one end. A first concave stop is provided on the outer end face of the sealed end wall. A second through hole, two key-shaped holes, several first through holes, and several first threaded holes are opened on the sealed end wall. Several third through holes are opened on the peripheral wall of the rotary cylinder. Two trapezoidal notches are provided on the edge of the open end of the rotary cylinder. Two mounting parts are formed between the two trapezoidal notches in the circumferential direction. The end faces of the two mounting parts are defined as a first plane and a second plane, respectively. Two second threaded holes are provided on both the first plane and the second plane.

[0005] Furthermore, a plurality of first through holes are arranged circumferentially, a plurality of first threaded holes are arranged circumferentially, and the distribution axes of the plurality of first threaded holes, the distribution axes of the plurality of first through holes, the axis of the first recessed stop, and the axis of the second through hole are all collinear with the rotation axis of the rotary drum.

[0006] Furthermore, the rotary drum is an HT300 casting with a sealing end wall thickness of 60mm, a first recessed stop depth of 15mm, a first threaded hole of M24 thread, eight first threaded holes, a first through hole diameter of Φ100mm, eight first through holes, one end of a key-shaped hole connected to a second through hole, two key-shaped holes evenly distributed circumferentially, and a second through hole diameter of Φ120mm.

[0007] Furthermore, the two trapezoidal notches are evenly distributed around the circumference, the two mounting parts are evenly distributed around the circumference, the first plane and the second plane are fan-shaped annular planes with consistent contours, and the second threaded hole is an M12 threaded blind hole.

[0008] Furthermore, the thickness of the peripheral wall is 40 mm.

[0009] Furthermore, the diameter of the third through hole is Φ90mm, and the number of the third through holes is thirty-four. Thirty-two of the third through holes are divided into four groups and arranged axially along the peripheral wall. Each group has eight third through holes evenly distributed circumferentially along the peripheral wall, and the other two third through holes are correspondingly opened on the two mounting parts.

[0010] Furthermore, the length of the base of the trapezoidal notch is 350mm, and the depth of the trapezoidal notch is 290mm.

[0011] Furthermore, the length-to-diameter ratio of the rotary drum is 1.2 to 1.5.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] The trapezoidal notch, the first through hole, the second through hole, and the third through hole can reduce the weight of the rotary drum, thereby reducing the load on the boring machine. At the same time, the trapezoidal notch and several third through holes can ensure the smooth removal of iron chips generated during machining. The trapezoidal notch is an isosceles trapezoidal notch. Two evenly distributed trapezoidal notches can achieve equal rigidity design from the bottom edge to the first plane and the second plane area, ensuring the stability of the rotary drum structure and the machining process. The rotary drum is a casting of HT300 with a peripheral wall thickness of 40mm, which has strong vibration absorption capacity and low cost. The rotary drum is mounted on the ram of the boring machine through the first concave stop and the first double-ended stud. It is connected to the spindle through a flat key, so that the rotary drum can rotate around the spindle for centering. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the rotary drum of the present invention;

[0015] Figure 2 yes Figure 1 AA section view;

[0016] Figure 3 yes Figure 1 View from direction B;

[0017] Figure 4 yes Figure 1 CC section view;

[0018] Figure 5 yes Figure 1 DD sectional view;

[0019] Figure 6 This is a schematic diagram of the connection between the rotary drum and the boring machine for machining the valve shaft and valve shaft hole according to the present invention;

[0020] Figure 7 yes Figure 6 EE sectional view;

[0021] Figure 8This is a schematic diagram of a boring tool machining a shaft hole.

[0022] In the diagram, 1-valve shaft; 2-shaft hole; 3-first end face; 4-second end face; 5-rotating cylinder; 6-sealing end wall; 7-first recessed stop; 8-first threaded hole; 9-keyhole; 10-first through hole; 11-second through hole; 12-first plane; 13-second plane; 14-peripheral wall; 15-trapezoidal notch; 16-opening; 17-rotation axis; 18-second threaded hole; 19-inner circumferential surface; 20-third through hole; 21-bottom edge; 22-slide block; 23-third threaded hole; 24-second circumferential surface; 25-first engagement hole; 26- Support seat; 27-Second concave stop; 28-First convex stop; 29-First nut; 30-Spindle; 31-Flat key; 32-First screw; 33-Second stud; 34-Rotating flange; 35-Second mating hole; 36-Second convex stop; 37-Second nut; 38-Second screw; 39-Bore tool holder; 40-Third screw; 41-Counterweight; 42-Bore tool; 43-Bore tool edge; 44-First stud; 45-Angular contact ball bearing; 46-Outer ring cap; 47-Fourth screw; 48-Inner ring cap; 49-Fifth screw. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0024] The connections mentioned in this invention are divided into fixed connections and detachable connections. Fixed connections, also known as non-detachable connections, include but are not limited to conventional fixed connection methods such as folded connections, riveted connections, adhesive connections, and welded connections. Detachable connections include but are not limited to conventional disassembly methods such as bolted connections, snap-fit ​​connections, pin connections, and hinged connections. When a specific connection method is not explicitly defined, it is assumed that at least one existing connection method can be found to achieve this function, and those skilled in the art can choose according to their needs. For example, a welded connection can be chosen for fixed connections, and a bolted connection can be chosen for detachable connections.

[0025] The present invention will be further described in detail below with reference to the accompanying drawings. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0026] Example: Figures 1 to 8As shown, a rotary cylinder 5 for machining the valve shaft and shaft hole of a water turbine ball valve is disclosed. The rotary cylinder 5 is a cylindrical component with a sealed end wall 6 at one end. A first concave stop 7 is provided on the outer end face of the sealed end wall 6. A second through hole 11, two key-shaped holes 9, several first through holes 10 and several first threaded holes 8 are provided on the sealed end wall 6. Several third through holes 20 are provided on the peripheral wall 14 of the rotary cylinder 5. Two trapezoidal notches 15 are provided on the edge of the open end of the rotary cylinder 5. Two mounting parts are formed between the two trapezoidal notches 15 in the circumferential direction. The end faces of the two mounting parts are defined as a first plane 12 and a second plane 13, respectively. Two second threaded holes 18 are provided on both the first plane 12 and the second plane 13.

[0027] A plurality of first through holes 10 are arranged circumferentially, a plurality of first threaded holes 8 are arranged circumferentially, and the distribution axis of the plurality of first threaded holes 8, the distribution axis of the plurality of first through holes 10, the axis of the first concave stop 7 and the axis of the second through hole 11 are all collinear with the rotation axis 17 of the rotary drum 5.

[0028] The rotary drum 5 is an HT300 casting. The thickness of the sealing end wall 6 is 60mm. The depth of the first concave stop 7 is 15mm. The first threaded hole 8 is an M24 threaded hole. There are eight first threaded holes 8. The diameter of the first through hole 10 is Φ100mm. There are eight first through holes 10. One end of the key-shaped hole 9 is connected to the second through hole 11, so that the end of the key-shaped hole 9 connected to the second through hole 11 forms an opening 16. The two key-shaped holes 9 are evenly distributed around the circumference. The diameter of the second through hole 11 is Φ120mm.

[0029] Two trapezoidal notches 15 are evenly distributed around the circumference, and the two mounting parts are evenly distributed around the circumference. The first plane 12 and the second plane 13 are fan-shaped annular planes with the same outline, and the second threaded hole 18 is an M12 threaded blind hole.

[0030] The thickness of the peripheral wall 14 is 40mm, and the diameter of the inner peripheral surface 19 of the rotary cylinder 5 is 10mm larger than the diameter of the valve shaft 1 to be processed.

[0031] The diameter of the third through hole 20 is Φ90mm, and there are thirty-four third through holes 20. Thirty-two of the third through holes 20 are divided into four groups and arranged along the axial direction of the peripheral wall 14. Each group has eight third through holes 20 evenly distributed along the circumference of the peripheral wall 14, and the other two third through holes 20 are correspondingly opened on the two mounting parts.

[0032] The length of the base 21 of the trapezoidal notch 15 is 350mm, and the depth of the trapezoidal notch 15 is 290mm.

[0033] The length-to-diameter ratio of the rotary drum 5 is 1.2 to 1.5.

[0034] The turbine ball valve includes a valve and a valve body. The valve is located in the valve body. Valve shafts 1 are provided on both sides of the valve. Shaft holes 2 are provided on both sides of the valve body. The two valve shafts 1 pass through the two shaft holes 2 respectively. An annular gap is formed between the valve shafts 1 and the corresponding shaft holes 2. The valve and the valve body are both supported on the rotary table of the boring machine. The two valve shafts 1 and the two shaft holes 2 are coaxial with the spindle 30 of the boring machine.

[0035] The rotary drum 5 is coaxially connected to the rotary flange 34. The rotary flange 34 and the support seat 26 are coaxially rotated through the angular contact ball bearing 45. The support seat 26 is coaxially connected to the slide 22 of the boring machine. The spindle 30 passes through the support seat 26 and is close to the rotary drum 5. The rotary drum 5 and the spindle 30 are circumferentially limited by the flat key 31. The open end of the rotary drum 5 is provided with a boring tool 42. The open end of the rotary drum 5 enters and exits the annular gap axially. The boring tool edge 43 of the boring tool 42 respectively processes the outer circumference of the two valve shafts 1 and the inner circumference of the two shaft holes 2.

[0036] Specifically, the annular gap is 55mm to 80mm wide, the concentric deviation between the valve shaft 1 and the shaft hole 2 before processing is less than 2mm, the outer ends of the two valve shafts 1 are defined as the first end face 3, the outer ends of the two shaft holes 2 are defined as the second end face 4, the first end face 3 protrudes from the second end face 4, the first end face 3 is perpendicular to the valve shaft 1, and the second end face 4 is perpendicular to the shaft hole 2.

[0037] The spindle 30 is positioned on the right side of the rotary table, the opening end of the rotary cylinder 5 faces left, and the left end of the rotary flange 34 has a second convex stop 36, which mates with the first concave stop 7. The inner hole of the rotary flange 34 is a stepped hole composed of a first inner hole and a second inner hole, which are positioned left and right. The diameter of the second inner hole is larger than the diameter of the first inner hole. The outer ring of the angular contact ball bearing 45 circumferentially mates with the second inner hole. The support 26 is a sleeve-shaped component, and the outer periphery of the support 26 has a stepped circumferential surface composed of a first circumferential surface and a second circumferential surface 24. The second circumferential surface 24 is arranged on the left and right, and the diameter of the first circumferential surface is smaller than the diameter of the second circumferential surface 24. The inner ring of the angular contact ball bearing 45 is sleeved on the first circumferential surface. The right end of the support seat 26 is provided with a second concave stop 27, and the left end of the ram 22 of the boring machine is provided with a first convex stop 28. The second concave stop 27 and the first convex stop 28 are fitted together. The support seat 26 is provided with a through third inner hole. The third inner hole is opened on the bottom surface of the second concave stop 27. The second concave stop 27, the first circumferential surface, the second circumferential surface 24, and the third inner hole are coaxial. The main shaft 30 passes through the third inner hole and is connected to the rotary drum 5.

[0038] Two keyways are provided on the left end face of the spindle 30. The left parts of the two flat keys 31 are adapted to fit into the two key-shaped holes 9, and the right parts of the two flat keys 31 are respectively matched with the two keyways. The headless end of the first screw 32 passes through the countersunk hole on the flat key 31 and is threaded to the spindle 30.

[0039] Two second screws 38 respectively engage with two second threaded holes 18 on the first plane 12, fixing the boring bar holder 39 on the first plane 12. The boring bar 42 is mounted on the boring bar holder 39. Two third screws 40 respectively engage with two second threaded holes 18 on the second plane 13, fixing the counterweight 41 on the second plane 13.

[0040] Specifically, it also includes an inner ring cover 48, which is an annular component. The inner ring cover 48 is connected to the support seat 26 by a number of fifth screws 49. The first circumferential surface and the second circumferential surface 24 are connected by a second annular surface. The inner ring cover 48 presses the inner ring of the bearing onto the second annular surface. The main shaft 30 passes through the support seat 26 and the inner ring cover 48 and approaches the rotary drum 5.

[0041] It also includes an outer ring cover 46, which is an annular component. The outer ring cover 46 and the rotary flange 34 are connected by a number of fourth screws 47. The outer ring cover 46 presses the outer ring of the bearing onto the bottom surface of the second inner hole.

[0042] The outer periphery of the slewing flange 34 is provided with a second flange flange. A number of second engagement holes 35 are evenly distributed around the second flange flange. The left part of a number of second double-ended studs 33 is threadedly connected to a number of first threaded holes 8 in a corresponding manner. The right part of a number of second double-ended studs 33 passes through a number of second engagement holes 35 in a corresponding manner and is connected to a second nut 37 in a corresponding manner.

[0043] The right end of the second circumferential surface 24 is provided with a first flange, and the first flange is provided with a plurality of first engagement holes 25. A plurality of third threaded holes 23 are evenly distributed around the left end face of the slide ram 22. A first convex stop 28 is provided on the left end face of the slide ram 22. The right part of a plurality of first double-ended studs 44 is connected to a plurality of third threaded holes 23 in a corresponding manner. The left part of a plurality of first double-ended studs 44 passes through a plurality of first engagement holes 25 in a corresponding manner and is connected to a first nut 29 respectively.

[0044] The diameter of the second mating hole 35 is Φ26mm, and there are eight second mating holes 35. The first threaded hole 8 is an M24 threaded hole, and there are eight first threaded holes 8. The second flange is a square flange flange. The diameter of the first mating hole 25 is Φ50mm, and there are four first mating holes 25. The second threaded hole 18 is an M12 threaded hole, and there are eight second threaded holes 18. The support base 26 is a component made of Q345 material.

[0045] The trapezoidal notch 15, the first through hole 10, the second through hole 11, and the third through hole 20 can reduce the weight of the rotary drum 5. Simultaneously, the trapezoidal notch 15 and several third through holes 20 ensure smooth removal of machining chips. The trapezoidal notch 15 is an isosceles trapezoidal notch; two evenly distributed trapezoidal notches 15 can achieve equal rigidity design within the area from the base 21 to the first plane 12 and the second plane 13, ensuring the structural stability of the rotary drum 5 and its stability during machining. The rotary drum 5 is an HT300 casting with a peripheral wall 14 thickness of 40 mm. mm, strong vibration absorption capacity, low cost; the rotary drum 5 is mounted on the slide 22 of the boring machine through the first concave stop 7 and the first double-ended stud 44, and cooperates with the spindle 30 through the flat key 31, so that the rotary drum 5 can rotate around the spindle 30 in a centered manner. The weight of the rotary drum 5 and the cutting force generated by machining are borne by the rigid slide 22, and the spindle 30 only provides the rotational motion power during machining, avoiding the problems of low machining efficiency, poor machining quality and excessive wear of the bearings of the spindle 30 caused by excessive load on the spindle 30 with poor rigidity.

[0046] The above embodiments are merely illustrative examples of the present invention and do not limit its scope of protection. Those skilled in the art can make partial changes to them, as long as they do not exceed the spirit and essence of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A rotary cylinder for machining the valve shaft and shaft hole of a water turbine ball valve, characterized in that: The rotary drum (5) is a cylindrical component with a sealing end wall (6) at one end. A first concave stop (7) is provided on the outer end face of the sealing end wall (6). A second through hole (11), two key holes (9), several first through holes (10) and several first threaded holes (8) are provided on the sealing end wall (6). Several third through holes (20) are provided on the peripheral wall (14) of the rotary drum (5). Two trapezoidal notches (15) are provided on the edge of the open end of the rotary drum (5). Two mounting parts are formed between the two trapezoidal notches (15) in the circumferential direction. The end faces of the two mounting parts are defined as the first plane (12) and the second plane (13). Two second threaded holes (18) are provided on both the first plane (12) and the second plane (13).

2. The rotary cylinder for machining the valve shaft and shaft hole of a water turbine ball valve according to claim 1, characterized in that: A plurality of first through holes (10) are arranged in a circle, a plurality of first threaded holes (8) are arranged in a circle, and the distribution axis of the plurality of first threaded holes (8), the distribution axis of the plurality of first through holes (10), the axis of the first concave stop (7), and the axis of the second through hole (11) are all collinear with the rotation axis (17) of the rotary drum (5).

3. The rotary cylinder for machining the valve shaft and shaft hole of a water turbine ball valve according to claim 1, characterized in that: The rotary drum (5) is an HT300 casting. The thickness of the end wall (6) is 60mm. The depth of the first concave stop (7) is 15mm. The first threaded hole (8) is an M24 threaded hole. There are eight first threaded holes (8). The diameter of the first through hole (10) is Φ100mm. There are eight first through holes (10). One end of the key hole (9) is connected to the second through hole (11). The two key holes (9) are evenly distributed around the circumference. The diameter of the second through hole (11) is Φ120mm.

4. A rotary cylinder for machining the valve shaft and shaft hole of a water turbine ball valve according to claim 1, characterized in that: Two trapezoidal notches (15) are evenly distributed around the circumference, and the two mounting parts are evenly distributed around the circumference. The first plane (12) and the second plane (13) are fan-shaped annular planes with consistent contours, and the second threaded hole (18) is an M12 threaded blind hole.

5. A rotary cylinder for machining the valve shaft and shaft hole of a water turbine ball valve according to claim 1, characterized in that: The thickness of the peripheral wall (14) is 40 mm.

6. A rotary cylinder for machining the valve shaft and shaft hole of a water turbine ball valve according to claim 1, characterized in that: The diameter of the third through hole (20) is Φ90mm. There are thirty-four third through holes (20). Thirty-two of the third through holes (20) are divided into four groups and arranged along the axial direction of the peripheral wall (14). Eight third through holes (20) in each group are evenly distributed along the circumference of the peripheral wall (14). The other two third through holes (20) are opened on the two mounting parts respectively.

7. A rotary cylinder for machining the valve shaft and shaft hole of a water turbine ball valve according to claim 1, characterized in that: The length of the bottom edge (21) of the trapezoidal notch (15) is 350mm, and the depth of the trapezoidal notch (15) is 290mm.

8. A rotary cylinder for machining the valve shaft and shaft hole of a water turbine ball valve according to any one of claims 1-7, characterized in that: The length-to-diameter ratio of the rotary drum (5) is 1.2 to 1.5.

Images