On-line grinding repair equipment for ball valve body bore

Abstract

The utility model discloses a ball valve body hole on -line grinding repair equipment, it includes machine body frame, first screw drive mechanism, second screw drive mechanism, X axle sliding table, Z axle sliding table and electric grinding mechanism, electric grinding mechanism, Z axle sliding table, X axle sliding table and machine body frame are sequentially arranged along Y, and electric grinding mechanism is connected on Z axle sliding table, and second screw drive mechanism and Z axle sliding table are all set up on X axle sliding table, and second screw drive mechanism is connected on Z axle sliding table, and X axle sliding table and first screw drive mechanism are all set up on machine body frame, and first screw drive mechanism is connected on X axle sliding table. Make height integration and adopt modularization design, and the overall weight is light, and the structure is compact, and it is especially applicable to the on -line maintenance operation of nuclear power station narrow space. Realize high accuracy positioning, and it is convenient to install and operate in the narrow space, thereby completely satisfy the ball valve on -line repair technical requirement of nuclear power station important industrial occasion, has important engineering application value.

Description

Technical Field

[0001] This utility model relates to an online grinding and repair device for the inner bore of a ball valve. Background Technology

[0002] Ball valves are widely used in fields with extremely high safety requirements, such as nuclear power plants, petrochemical plants, and long-distance pipelines. However, during long-term use, the inner bore of ball valves is prone to wear and corrosion, affecting sealing performance and service life. Traditional repair methods require disassembling the valve and sending it for grinding, which is not only time-consuming and costly but also disrupts the normal operation of the system. Furthermore, current CNC heavy-duty roll grinding machines are used to grind the valve body internals, but these machines are large and heavy, making them unsuitable for online grinding and maintenance operations in confined spaces such as nuclear power plants. Utility Model Content

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings of existing technology and to provide an online grinding and repair device for the inner bore of a ball valve.

[0004] This utility model is achieved through the following technical solution:

[0005] An online grinding and repair device for the inner bore of a ball valve includes a machine frame, a first lead screw drive mechanism, a second lead screw drive mechanism, an X-axis slide, a Z-axis slide, and an electric grinding mechanism. The electric grinding mechanism, the Z-axis slide, the X-axis slide, and the machine frame are arranged sequentially along the Y direction. The electric grinding mechanism is connected to the Z-axis slide. The second lead screw drive mechanism and the Z-axis slide are both disposed on the X-axis slide. The second lead screw drive mechanism is connected to the Z-axis slide and is used to drive the Z-axis slide to move along the Z direction on the X-axis slide, thereby causing the electric grinding mechanism to be inserted into or retracted from the valve body. The X-axis slide and the first lead screw drive mechanism are both disposed on the machine frame. The first lead screw drive mechanism is connected to the X-axis slide and is used to drive the X-axis slide to move along the X direction on the machine frame, thereby causing the electric grinding mechanism to move in a direction close to or away from the grinding surface of the valve body.

[0006] Furthermore, the first lead screw drive mechanism includes a first rotary motor, a first lead screw, and a first mounting base. The first mounting base and the first rotary motor are both disposed on the machine frame. The first lead screw is rotatably connected to the first mounting base. The first rotary motor is connected to one end of the first lead screw and is used to drive the rotation of the first lead screw. The X-axis slide is threadedly connected to the first lead screw.

[0007] Furthermore, a first bearing is provided between the first mounting base and the first lead screw;

[0008] And / or, the number of the first mounting bases is two, the two ends of the first lead screw are respectively connected to the two first mounting bases, and the X-axis slide is disposed between the two first mounting bases;

[0009] And / or, the first lead screw drive mechanism further includes a first guide rail and a first slider, the first guide rail extending along the X direction and disposed on the machine frame, the first slider being connected to the X-axis slide table, and the first slider being connected to the first guide rail and moving on the first guide rail.

[0010] Furthermore, the second lead screw drive mechanism includes a second rotary motor, a second lead screw, and a second mounting base. The second mounting base and the second rotary motor are both disposed on the X-axis slide. The second lead screw is rotatably connected to the second mounting base. The second rotary motor is connected to one end of the second lead screw and is used to drive the rotation of the second lead screw. The Z-axis slide is threadedly connected to the second lead screw.

[0011] Furthermore, a second bearing is provided between the second mounting base and the second lead screw;

[0012] And / or, the number of the second mounting bases is two, the two ends of the second lead screw are respectively connected to the two second mounting bases, and the Z-axis slide is disposed between the two second mounting bases;

[0013] And / or, the second lead screw drive mechanism further includes a second guide rail and a second slider, the second guide rail extending along the X direction and disposed on the X-axis slide, the second slider being connected to the Z-axis slide, and the second slider being connected to the second guide rail and moving on the second guide rail.

[0014] Furthermore, the machine frame includes a main body and a positioning plate. The X-axis slide and the first lead screw drive mechanism are both disposed on the main body. The positioning plate is connected to the top of the main body. The positioning plate is provided with multiple positioning holes, and the multiple positioning holes are respectively connected to the valve body through positioning components.

[0015] Furthermore, the frame also includes multiple reinforcing ribs, the main body and the positioning plate are L-shaped, and the multiple reinforcing ribs are connected to the main body and the positioning plate.

[0016] Furthermore, the electric grinding mechanism includes a base, a drive motor, and a grinding head. The base is connected to the Z-axis slide and extends in a direction close to the valve body. The grinding head is located at one end of the base close to the valve body. The drive motor is mounted on the base and connected to the grinding head for controlling the rotation of the grinding head.

[0017] Furthermore, the grinding head is a flap wheel.

[0018] Furthermore, the online grinding and repair equipment for the inner bore of the ball valve body also includes a control device, which is electrically connected to the first lead screw drive mechanism, the second lead screw drive mechanism, and the electric grinding mechanism, and is used to control the opening and closing of the first lead screw drive mechanism, the second lead screw drive mechanism, and the electric grinding mechanism, respectively.

[0019] The beneficial effects of this utility model are as follows:

[0020] This utility model discloses an online grinding and repair device for the inner bore of a ball valve. The electric grinder mechanism, Z-axis slide, X-axis slide, and machine frame are sequentially arranged and interconnected along the Y-axis, resulting in a highly integrated and modular design. The device is lightweight and compact, making it particularly suitable for online maintenance operations in confined spaces such as nuclear power plants. Furthermore, a first lead screw drive mechanism and a second lead screw drive mechanism are used to drive the electric grinder mechanism in the X and Z axes respectively to achieve high-precision positioning. This facilitates installation and operation in confined spaces, thus fully meeting the technical requirements for online ball valve repair in critical industrial settings such as nuclear power plants, and possessing significant engineering application value. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the ball valve body inner bore online grinding and repair equipment in use according to an embodiment of this utility model.

[0022] Figure 2 This is a schematic diagram of the structure of the online grinding and repair equipment for the inner bore of a ball valve body according to an embodiment of this utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] Body frame 1

[0025] Main body 11

[0026] Positioning plate 12

[0027] Reinforcing rib 13

[0028] X-axis slide 2

[0029] Z-axis slide 3

[0030] First lead screw drive mechanism 4

[0031] First rotary motor 41

[0032] First lead screw 42

[0033] First mounting base 43

[0034] First guide rail 44

[0035] First slider 45

[0036] First bearing 46

[0037] Second lead screw drive mechanism 5

[0038] Second rotary motor 51

[0039] Second lead screw 52

[0040] Second mounting bracket 53

[0041] Second guide rail 54

[0042] Second slider 55

[0043] Electric grinder mechanism 6

[0044] Drive motor 61

[0045] Base 62

[0046] Grinding head 63

[0047] Valve body 10

[0048] Valve body grinding surface 101 Detailed Implementation

[0049] The following description of the embodiments is with reference to the accompanying drawings, which illustrate specific embodiments in which the present invention can be implemented.

[0050] like Figure 1 and Figure 2 As shown, this embodiment discloses an online grinding and repair device for the inner bore of a ball valve. This device includes a machine frame 1, an X-axis slide 2, a Z-axis slide 3, a first lead screw drive mechanism 4, a second lead screw drive mechanism 5, and an electric grinding mechanism 6. The electric grinding mechanism 6, the Z-axis slide 3, the X-axis slide 2, and the machine frame 1 are arranged sequentially along the Y direction. The electric grinding mechanism 6 is connected to the Z-axis slide 3. The second lead screw drive mechanism 5 and the Z-axis slide 3 are both located on the X-axis slide 2, and the first lead screw drive mechanism 4, the second lead screw drive mechanism 5, and the second lead screw drive mechanism 6 are all located on the X-axis slide 2. The two lead screw drive mechanism 5 is connected to the Z-axis slide 3 and is used to drive the Z-axis slide 3 to move along the Z direction on the X-axis slide 2, so as to drive the electric grinding mechanism 6 to be inserted into the valve body 10 or retracted to the outside of the valve body 10. The X-axis slide 2 and the first lead screw drive mechanism 4 are both set on the machine frame 1, and the first lead screw drive mechanism 4 is connected to the X-axis slide 2 and is used to drive the X-axis slide 2 to move along the X direction on the machine frame 1, so as to drive the electric grinding mechanism 6 to move in the direction close to or away from the valve body grinding surface 101.

[0051] The electric grinding mechanism 6 is mounted on the Z-axis slide 3, which is connected to the X-axis slide 2. The second lead screw drive mechanism 5 provides driving force to move the electric grinding mechanism 6 along the Z-axis, allowing it to be inserted into or retracted outside the valve body 10. The first lead screw drive mechanism 4 drives the X-axis slide 2 to move along the X-axis on the machine frame 1, thereby moving the electric grinding mechanism 6 towards or away from the valve body grinding surface 101. The electric grinding mechanism 6, Z-axis slide 3, X-axis slide 2, and machine frame 1 are sequentially arranged and interconnected along the Y-axis, achieving high integration and modular design. This enables precise online grinding repair of the valve body grinding surface 101 using an online grinding repair device for the inner bore of a ball valve. Furthermore, the device is lightweight and compact, making it particularly suitable for online maintenance operations in confined spaces such as nuclear power plants. Meanwhile, the first lead screw drive mechanism 4 and the second lead screw drive mechanism 5 are used to drive the electric mill mechanism 6 to move in the X and Z directions respectively to achieve high-precision positioning, and are easy to install and operate in narrow spaces, thus fully meeting the technical requirements for online repair of ball valves in important industrial occasions such as nuclear power plants, and have important engineering application value.

[0052] In this embodiment, the machine frame 1 includes a main body 11 and a positioning plate 12. The X-axis slide 2 and the first lead screw drive mechanism 4 are both located on the main body 11. The positioning plate 12 is connected to the top of the main body 11 and has multiple positioning holes. These positioning holes are respectively connected to the valve body 10 via positioning components. The positioning plate 12 of the machine frame 1 is connected to the valve body 10 through these multiple positioning holes, allowing the ball valve body internal bore online grinding and repair equipment to be interconnected and precisely positioned with the valve body 10, resulting in higher stability during use. The electric grinding mechanism 6, the Z-axis slide 3, the X-axis slide 2, and the main body 11 are arranged sequentially along the Y direction. The X-axis slide 2 and the first lead screw drive mechanism 4 are mounted on the main body 11, making installation and connection very convenient.

[0053] The frame 1 also includes multiple reinforcing ribs 13. The main body 11 and the positioning plate 12 are L-shaped, and the multiple reinforcing ribs 13 are all connected to the main body 11 and the positioning plate 12. Both the main body 11 and the positioning plate 12 are plate-shaped and L-shaped. The reinforcing ribs 13 have a reinforcing function. Through the multiple reinforcing ribs 13, the connection strength between the main body 11 and the positioning plate 12 can be effectively strengthened, so as to achieve high structural stability of the frame 1 and further enhance high-precision positioning and operation.

[0054] The electric grinding mechanism 6 includes a drive motor 61, a base 62, and a grinding head 63. The base 62 is connected to the Z-axis slide 3 and extends in the direction close to the valve body 10. The grinding head 63 is located at one end of the base 62 near the valve body 10. The drive motor 61 is mounted on the base 62 and connected to the grinding head 63 to control its rotation. The base 62 and the drive motor 61 are conveniently mounted on the Z-axis slide 3. The drive motor 61 provides driving force to drive the rotation of the grinding head 63, which then grinds the valve body grinding surface 101.

[0055] In this embodiment, the grinding head 63 is a flap wheel. The flap wheel is mounted and connected to the drive motor 61. The use of a flap wheel, characterized by good elasticity, high efficiency, good heat dissipation, and low noise, for grinding and polishing combines the dual functions of grinding and polishing, effectively removing surface defects and improving surface finish. Specifically, the dedicated flap wheel for this grinding tool is made of 320# steel, with a diameter of 75mm and a length of 25mm.

[0056] In this embodiment, the first lead screw drive mechanism 4 includes a first rotary motor 41, a first lead screw 42, and a first mounting base 43. Both the first mounting base 43 and the first rotary motor 41 are mounted on the machine frame 1. The first lead screw 42 is rotatably connected to the first mounting base 43. The first rotary motor 41 is connected to one end of the first lead screw 42 and drives its rotation. The X-axis slide 2 is threadedly connected to the first lead screw 42. Both the first rotary motor 41 and the first mounting base 43 are mounted on the machine body 11. The first rotary motor 41 provides driving force and drives the first lead screw 42 to rotate. The rotation of the first lead screw 42 causes the X-axis slide 2 to move linearly along the lead screw 42, i.e., the X-axis slide 2 moves along the X direction. The first mounting base 43 provides support, making the first lead screw 42 more stable during rotation. Simultaneously, the use of a high-precision first lead screw 42 in conjunction with a servo drive achieves a feed accuracy of ±0.002mm, enabling precise motion control.

[0057] A first bearing 46 is provided between the first mounting base 43 and the first lead screw 42. The first bearing 46 supports the first lead screw 42 and reduces friction loss, thereby enabling precise motion control.

[0058] There are two first mounting bases 43, and the two ends of the first lead screw 42 are respectively connected to the two first mounting bases 43. The X-axis slide 2 is disposed between the two first mounting bases 43. This allows the two ends of the first lead screw 42 to be supported on the two first mounting bases 43 respectively, thereby achieving greater stability in the rotation of the first lead screw 42 and the movement of the X-axis slide 2.

[0059] The first lead screw drive mechanism 4 also includes a first guide rail 44 and a first slider 45. The first guide rail 44 extends along the X-direction and is disposed on the machine frame 1. The first slider 45 is connected to the X-axis slide table 2 and moves along the first guide rail 44. The first guide rail 44 provides a guiding function, allowing the first slider 45 and the X-axis slide table 2 to move along the X-direction on the first guide rail 44, resulting in higher stability and further enabling precise motion control. There are two first guide rails 44, spaced apart on the machine body 11 of the machine frame 1, with the first lead screw 42 located in the middle of the two first guide rails 44.

[0060] The second lead screw drive mechanism 5 includes a second rotary motor 51, a second lead screw 52, ​​and a second mounting base 53. Both the second mounting base 53 and the second rotary motor 51 are mounted on the X-axis slide 2. The second lead screw 52 is rotatably connected to the second mounting base 53. The second rotary motor 51 is connected to one end of the second lead screw 52 and drives its rotation. The Z-axis slide 3 is threadedly connected to the second lead screw 52. Both the second rotary motor 51 and the second mounting base 53 are mounted on the X-axis slide 2. The second rotary motor 51 provides driving force and drives the second lead screw 52 to rotate. The rotation of the second lead screw 52 causes the Z-axis slide 3 to move linearly along the second lead screw 52, ​​i.e., the Z-axis slide 3 moves along the Z-axis. The second mounting base 53 provides support, making the second lead screw 52 more stable during rotation. Simultaneously, the use of a high-precision second lead screw 52 in conjunction with a servo drive achieves a feed accuracy of ±0.002mm, enabling precise motion control.

[0061] A second bearing is provided between the second mounting base 53 and the second lead screw 52. The second bearing supports the second lead screw 52 and reduces friction loss, thereby enabling precise motion control.

[0062] There are two second mounting bases 53, and the two ends of the second lead screw 52 are respectively connected to the two second mounting bases 53. The Z-axis slide 3 is disposed between the two second mounting bases 53. This allows the two ends of the second lead screw 52 to be supported on the two second mounting bases 53 respectively, thereby achieving greater stability in the rotation of the second lead screw 52 and the movement of the Z-axis slide 3.

[0063] The second lead screw drive mechanism 5 also includes a second guide rail 54 and a second slider 55. The second guide rail 54 extends along the X-axis and is mounted on the X-axis slide 2. The second slider 55 is connected to the Z-axis slide 3 and is connected to the second guide rail 54, moving along the second guide rail 54. The second guide rail 54 provides guidance, allowing the second slider 55 and the Z-axis slide 3 to move along the Z-axis along the second guide rail 54, resulting in higher stability and further enabling precise motion control. There are two second guide rails 54, spaced apart on the X-axis slide 2, with the second lead screw 52 located between the two second guide rails 54.

[0064] In this embodiment, the machine frame 1, X-axis slide 2 and Z-axis slide 3 are all made of 6061 aluminum alloy, so that the overall size of the ball valve body inner hole online grinding and repair equipment is 375mm wide and 492mm high, and the weight is reduced by more than 40% compared with traditional equipment. This achieves a lightweight structural design, which is convenient for installation and operation in narrow spaces.

[0065] The position of the flap wheel is observed through an endoscope to ensure the precise positioning of the grinding head 63. The grinding path and data coordinates are set, first positioning the X-axis of the power module, then the Z-axis, and ensuring an optimal working angle of 5-10° between the flap wheel and the valve seat. By integrating a high-definition endoscope, real-time monitoring of the processing is achieved, ensuring grinding accuracy and quality, and enabling real-time visual monitoring.

[0066] The online grinding and repair equipment for the inner bore of a ball valve also includes a control device. This control device is electrically connected to the first lead screw drive mechanism 4, the second lead screw drive mechanism 5, and the electric grinding mechanism 6, and is used to control the opening and closing of these mechanisms. The control device also controls the opening and closing of the first rotary motor 41, the second rotary motor 51, and the drive motor 61. The grinding head 63 is mounted on the robot tool holder, and the control device operates the X-axis slide 2 and Z-axis slide 3 power modules for high-precision positioning. Based on the actual dimensions of the valve design drawings, the geometric relationship between the valve body center and the reference plane is calculated, and the actual dimensions of the valve body center are calibrated using an automatic centering device. The precise coordinate data is then entered into the operating system. This system features automatic centering, path planning, and parameter optimization, significantly improving repair efficiency and quality stability, achieving intelligent operation and control, and making it very convenient to use.

[0067] The online grinding repair equipment for the inner bore of the ball valve in this embodiment has the following specific parameters: spindle speed of the electric grinding mechanism 6: S = 1000 r / min; X-axis feed speed: F = 6-8 mm / min; number of processing cycles: 2 round trips along the X-axis; thickness removed in a single grinding pass: less than 0.01 mm. After grinding, the surface quality is inspected using an endoscope, and dimensional changes are measured using precision measuring tools. Experimental results show that using a 320# flap wheel with a diameter of 75 mm and a length of 25 mm for grinding and polishing achieves a coaxiality of 0.005–0.01 mm, a surface roughness Ra of 0.4–0.8 μm, and significantly improves the surface finish of the inner bore of the valve, fully meeting the technical requirements for nuclear-grade valve repair. The grinding repair process of the ball valve body internal bore online grinding repair equipment can effectively repair defects such as wear, corrosion, and microcracks on the inner surface of the valve body, improving the surface roughness from Ra3.2-6.3μm before repair to Ra0.4-0.8μm. Simultaneously, it corrects the geometric accuracy of the parts, achieving a coaxiality of 0.005-0.01mm. Practical application verification has shown that this equipment fully meets the technical requirements for online ball valve repair in important industrial settings such as nuclear power plants, and has significant engineering application value.

[0068] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. An online grinding and repair device for the inner bore of a ball valve, characterized in that, It includes a machine frame, a first lead screw drive mechanism, a second lead screw drive mechanism, an X-axis slide, a Z-axis slide, and an electric grinder mechanism. The electric grinder mechanism, the Z-axis slide, the X-axis slide, and the machine frame are arranged sequentially along the Y direction. The electric grinder mechanism is connected to the Z-axis slide. The second lead screw drive mechanism and the Z-axis slide are both disposed on the X-axis slide. The second lead screw drive mechanism is connected to the Z-axis slide and is used to drive the Z-axis slide to move along the Z direction on the X-axis slide, so as to drive the electric grinder mechanism to be inserted into or retracted out of the valve body. The X-axis slide and the first lead screw drive mechanism are both disposed on the machine frame. The first lead screw drive mechanism is connected to the X-axis slide and is used to drive the X-axis slide to move along the X direction on the machine frame, so as to drive the electric grinder mechanism to move in a direction close to or away from the grinding surface of the valve body.

2. The online grinding and repair equipment for the inner bore of a ball valve body as described in claim 1, characterized in that, The first lead screw drive mechanism includes a first rotary motor, a first lead screw, and a first mounting base. The first mounting base and the first rotary motor are both mounted on the machine frame. The first lead screw is rotatably connected to the first mounting base. The first rotary motor is connected to one end of the first lead screw and is used to drive the rotation of the first lead screw. The X-axis slide is threadedly connected to the first lead screw.

3. The online grinding and repair equipment for the inner bore of a ball valve body as described in claim 2, characterized in that, A first bearing is provided between the first mounting base and the first lead screw; And / or, the number of the first mounting bases is two, the two ends of the first lead screw are respectively connected to the two first mounting bases, and the X-axis slide is disposed between the two first mounting bases; And / or, the first lead screw drive mechanism further includes a first guide rail and a first slider, the first guide rail extending along the X direction and disposed on the machine frame, the first slider being connected to the X-axis slide table, and the first slider being connected to the first guide rail and moving on the first guide rail.

4. The online grinding and repair equipment for the inner bore of a ball valve body as described in claim 1, characterized in that, The second lead screw drive mechanism includes a second rotary motor, a second lead screw, and a second mounting base. The second mounting base and the second rotary motor are both disposed on the X-axis slide. The second lead screw is rotatably connected to the second mounting base. The second rotary motor is connected to one end of the second lead screw and is used to drive the rotation of the second lead screw. The Z-axis slide is threadedly connected to the second lead screw.

5. The online grinding and repair equipment for the inner bore of a ball valve body as described in claim 4, characterized in that, A second bearing is provided between the second mounting base and the second lead screw; And / or, the number of the second mounting bases is two, the two ends of the second lead screw are respectively connected to the two second mounting bases, and the Z-axis slide is disposed between the two second mounting bases; And / or, the second lead screw drive mechanism further includes a second guide rail and a second slider, the second guide rail extending along the X direction and disposed on the X-axis slide, the second slider being connected to the Z-axis slide, and the second slider being connected to the second guide rail and moving on the second guide rail.

6. The online grinding and repair equipment for the inner bore of a ball valve body as described in claim 1, characterized in that, The machine frame includes a main body and a positioning plate. The X-axis slide and the first lead screw drive mechanism are both located on the main body. The positioning plate is connected to the top of the main body. The positioning plate is provided with multiple positioning holes, and the multiple positioning holes are respectively connected to the valve body through positioning components.

7. The online grinding and repair equipment for the inner bore of a ball valve body as described in claim 6, characterized in that, The frame also includes multiple reinforcing ribs, and the main body and the positioning plate are L-shaped, with the multiple reinforcing ribs connected to the main body and the positioning plate.

8. The online grinding and repair equipment for the inner bore of a ball valve body as described in claim 1, characterized in that, The electric grinding mechanism includes a base, a drive motor, and a grinding head. The base is connected to the Z-axis slide and extends in a direction close to the valve body. The grinding head is located at one end of the base close to the valve body. The drive motor is mounted on the base and connected to the grinding head for controlling the rotation of the grinding head.

9. The online grinding and repair equipment for the inner bore of a ball valve body as described in claim 8, characterized in that, The grinding head is a flap wheel.

10. The online grinding and repair equipment for the inner bore of a ball valve body as described in claim 1, characterized in that, The ball valve body internal bore online grinding repair equipment also includes a control device, which is electrically connected to the first lead screw drive mechanism, the second lead screw drive mechanism and the electric grinding mechanism and is used to control the opening and closing of the first lead screw drive mechanism, the second lead screw drive mechanism and the electric grinding mechanism respectively.

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