Rotary lifting mechanism for valve machining and machining device thereof

Abstract

The application provides a rotary lifting mechanism for valve machining, comprising a transmission shaft assembly, an electric spindle, a lifting assembly and a driving assembly, the transmission shaft assembly has a mounting end for mounting a valve machining tool; the electric spindle is fixedly connected with the transmission shaft assembly, so that the transmission shaft assembly can rotate around the axis of the electric spindle; the lifting assembly is connected with the transmission shaft assembly, so that the transmission shaft assembly can move up and down along the axis direction of the electric spindle; the power output end of the driving assembly is connected with the lifting assembly, and the driving assembly can provide driving force for the lifting assembly. The rotary lifting mechanism for valve machining integrates the rotary lifting structure into one, has compact structure, small size and high precision, and can meet the machining operation such as valve seat cutting of small space valve body.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valve on-site machining, in particular to a rotary lifting mechanism for valve machining and a machining device thereof. BACKGROUND

[0002] A large number of valves used in nuclear power plants are welded to pipes. When the valve seat of such a valve is severely damaged, the damaged valve is usually cut off from the pipe, and a new valve is welded. If some high-value valves are repaired through on-line maintenance, a large amount of funds and time can be saved, the damage to the pipe caused by cutting can be reduced, and the number of expensive whole valve spare parts can be reduced.

[0003] For on-line maintenance of safety valves, stop valves and other horizontal valves, the valve seat can be replaced or the sealing surface can be machined for repair. There are some valve on-line repair tools on the market, but they have the following defects:

[0004] (1) The structure of the valve on-line repair tool is complex and the size is large. The size of the safety valve, stop valve and other horizontal valve seat valves is small (not more than DN200), and the cutting space is small. In the cutting process, high machining precision is required to ensure the accuracy of the weld cutting and the position of the bevel for subsequent welding, and the large size of the valve on-line repair tool cannot cut the valve seat of the small space valve body.

[0005] (2) The number of drive shafts of the valve on-line repair tool is small. Although it can be bored or ground on the plane or inner hole, it cannot be machined on the inclined surface or other complex curved surface.

[0006] (3) The automation degree of the valve on-line repair tool is low. In the case that the application environment of the valve has a certain radiation dose and the operator is not suitable for long-time operation on site, it cannot meet the requirements of remote control and operation. SUMMARY

[0007] The technical problem to be solved by the present application is to provide a rotary lifting mechanism for valve machining and a machining device thereof, which solves the problems of complex structure, large size, few drive shafts, inability to machine inclined surfaces or curved surfaces, and low automation degree of the valve on-line repair tool in the prior art.

[0008] To solve the above technical problems, the technical solutions of the present application are as follows:

[0009] A rotary lifting mechanism for valve machining, comprising:

[0010] A transmission shaft assembly having a mounting end for mounting a valve machining tool;

[0011] An electric spindle is fixedly connected with the transmission shaft assembly, so that the transmission shaft assembly can rotate around the axis of the electric spindle;

[0012] A lifting assembly is connected with the transmission shaft assembly, so that the transmission shaft assembly can move up and down along the axis of the electric spindle;

[0013] A driving assembly is connected with the lifting assembly at the power output end, and can provide driving force to the lifting assembly.

[0014] Preferably, the transmission shaft assembly comprises a lead screw spline shaft, a spline female, and a lead screw nut; the spline female is installed on the spline groove of the lead screw spline shaft; the lead screw nut is installed on the lead screw thread of the lead screw spline shaft; and the mounting end is located at the end of the lead screw spline shaft.

[0015] Preferably, the transmission shaft assembly further comprises a support bearing; the support bearing is arranged around the outer periphery of the lead screw nut.

[0016] Preferably, the transmission shaft assembly is connected with the electric spindle through a fixing seat;

[0017] The fixing seat is fixed on the electric spindle; the fixing seat has a cavity in the interior for accommodating the support bearing, and the lead screw nut is fixed on the fixing seat through the support bearing;

[0018] The spline female is fixed on the electric spindle, so that the lead screw spline shaft is coaxial with the electric spindle.

[0019] Preferably, a fixing plate is arranged on the outer wall of the fixing seat, and the driving assembly is fixed on the fixing seat through the fixing plate.

[0020] Preferably, the lifting assembly comprises a first gear and a second gear; the first gear is engaged with the second gear, and the second gear is fixed with the lead screw nut; when the first gear rotates, the second gear drives the lead screw nut to rotate, so that the lead screw nut produces relative displacement with respect to the lead screw spline shaft.

[0021] Preferably, the power output end of the driving assembly is connected with the first gear.

[0022] Preferably, the rotary lifting mechanism for valve machining further comprises a protective cover, which is sleeved outside the first gear and the second gear.

[0023] Preferably, the rotary lifting mechanism for valve machining further comprises a slip ring assembly; the slip ring assembly is fixed on the protective cover.

[0024] The application further provides a machining device for valve machining, comprising the rotary lifting mechanism for valve machining.

[0025] The above scheme of the application has at least the following beneficial effects:

[0026] The rotary lifting mechanism for valve machining comprises a transmission shaft assembly, an electric spindle, a lifting assembly and a driving assembly. The rotary lifting structure is integrated, compact in structure, small in size and high in precision, and can meet the machining operation such as valve seat cutting of small space valve body. The mounting end of the transmission shaft assembly can be further expanded with a linkage shaft, and the slip ring assembly facilitates cable connection of the expanded linkage shaft, thereby realizing numerical control linkage of three-axis, four-axis and other multi-axis, meeting the machining requirements of complex surfaces and remote control requirements. In addition, all driving power devices of the rotary lifting mechanism for valve machining can be arranged outside the valve, which is beneficial for radiation protection. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural schematic view of the rotary lifting mechanism for valve machining of the application;

[0028] Figure 2 is Figure 1 a partial schematic view of the A position of

[0029] Figure 3 is a structural schematic view of the slip ring assembly of the rotary lifting mechanism for valve machining of the application;

[0030] Figure 4 is a structural schematic view of the machining device for valve machining of the application;

[0031] 1, transmission shaft assembly; 10, mounting end; 11, screw key shaft; 12, key female; 13, screw nut; 14, support bearing; 2, electric spindle; 3, lifting assembly; 31, first gear; 32, second gear; 4, driving assembly; 5, fixed seat; 6, fixed plate; 7, protective cover; 8, slip ring assembly; 81, rotating part; 82, stationary part; 83, lever; 91, sliding table; 92, boring tool; 93, motor. DETAILED DESCRIPTION

[0032] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be accurately conveyed to those skilled in the art.

[0033] Example 1

[0034] As shown in Figures 1-3 The embodiment of the present application proposes a rotary lifting mechanism for valve machining, comprising: a transmission shaft assembly 1, an electric spindle 2, a lifting assembly 3, a driving assembly 4.

[0035] The transmission shaft assembly 1 has a mounting end 10 for mounting valve machining tools;

[0036] The electric spindle 2 is fixedly connected with the transmission shaft assembly 1, so that the transmission shaft assembly 1 can rotate around the axis of the electric spindle 2;

[0037] The lifting assembly 3 is connected with the transmission shaft assembly 1, so that the transmission shaft assembly 1 can move up and down along the axis direction of the electric spindle 2;

[0038] The power output end of the driving assembly 4 is connected with the lifting assembly 3, so as to provide driving force to the lifting assembly 3. The driving assembly 4 can be any device in the prior art that can provide driving force. In the embodiment, a servo motor assembly can be specifically used, which at least includes a servo motor.

[0039] For the purpose of realizing the present application, the design of the transmission shaft assembly 1 is not unique. In the embodiment, the transmission shaft assembly 1 includes a lead screw spline shaft 11, a spline female 12, and a lead screw nut 13. The spline female 12 is mounted on the spline groove of the lead screw spline shaft 11. The lead screw nut 13 is mounted on the lead screw thread of the lead screw spline shaft 11. The mounting end 10 is located at the end of the lead screw spline shaft 11.

[0040] As a preferred implementation of the embodiment, the transmission shaft assembly 1 further includes a support bearing 14, which surrounds the outer periphery of the lead screw nut 13.

[0041] It should be noted that the fixed connection between the transmission shaft assembly 1 and the electric spindle 2 is not unique. In the embodiment, the transmission shaft assembly 1 is fixedly connected with the electric spindle 2 through a fixed seat 5. The fixed seat 5 is fixed on the electric spindle 2. The fixed seat 5 has a cavity in the interior for accommodating the support bearing 14. The lead screw nut 13 is fixed to the fixed seat 5 through the support bearing 14. The spline female 12 is fixed to the electric spindle 2, so that the lead screw spline shaft 11 is coaxial with the electric spindle 2. Since the spline female 12 on the lead screw spline shaft 11 is fixed to the electric spindle 2, and the lead screw nut 13 is fixed to the fixed seat 5, the two fixed points make the lead screw spline shaft 11 and the electric spindle 2 coaxial. The structure of the two fixed points is simple, compact, and occupies a small space. The consistency and stability are good during the transmission and rotation of the lead screw spline shaft 11 and the electric spindle 2.

[0042] For example, in this embodiment, such as Figure 1 As shown, the fixed seat 5 is positioned at the upper rotary shaft of the electric spindle 2, so that the lead screw nut 13 is located at the upper rotary shaft of the electric spindle 2, and the lower rotary shaft of the electric spindle 2 is fixed to the spline nut 12. When the electric spindle 2 rotates, the spline 12 at the lower rotary shaft of the electric spindle 2 rotates, thereby driving the lead screw spline shaft 11 to rotate. At the same time, the fixed seat 5 at the upper rotary shaft of the electric spindle 2 also rotates, thereby driving the lead screw nut 13 connected to the fixed seat 5 to rotate. This ensures that the lead screw nut 13 and the lead screw spline shaft 11 do not have relative displacement, but rather achieve synchronous rotation of the lead screw spline shaft 11, spline nut 12, and lead screw nut 13 around the axis of the electric spindle 2.

[0043] To facilitate the fixing of the drive assembly 4, a fixing plate 6 is provided on the outer wall of the fixing base 5, and the drive assembly 4 is fixed to the fixing base 5 by the fixing plate 6.

[0044] In a preferred embodiment, the lifting assembly 3 includes a first gear 31 and a second gear 32; the first gear 31 meshes with the second gear 32, and the second gear 32 is fixed to the lead screw nut 13; when the first gear 31 rotates, the second gear 32 drives the lead screw nut 13 to rotate, causing the lead screw nut 13 to have a relative displacement with respect to the lead screw spline shaft 11, and the lead screw spline shaft 11 to perform lifting and lowering movements. The power output end of the drive assembly 4 is connected to the first gear 31, and the drive assembly 4 provides power to the first gear 31.

[0045] To prevent objects from being caught in the lifting assembly 3, the rotary lifting mechanism for valve processing also includes a protective cover 7, which is fitted over the first gear 31 and the second gear 32. The protective cover 7 is fixed to the fixed base 5. The protective cover 7 protects the first gear 31 and the second gear 32, ensuring that residues, debris, dust, and other objects do not fall into the gear transmission components.

[0046] To facilitate cable connection of the extended linkage shaft of the rotary lifting mechanism for valve processing, the rotary lifting mechanism for valve processing in this embodiment further includes a slip ring assembly 8; the slip ring assembly 8 is fixed to the protective cover 7. The slip ring assembly 8 can be a conventional rotating electrical component used in the prior art for connecting and transmitting energy and signals, such as an electric slip ring, a fluid slip ring, or a smooth ring.

[0047] As a preferred implementation of this embodiment, such as Figure 3As shown, the slip ring assembly 8 includes a rotating part 81, a stationary part 82, and a lever 83. The rotating part 81 is fixedly connected to the protective cover 7, the stationary part 82 can be connected to the fixed structure of the device, including but not limited to the interface of the power source or signal, and the lever 83 is connected to the stationary part 82, extends along the length direction of the transmission shaft assembly 1, and is located outside the driving assembly 4. The arrangement of the slip ring assembly 8 facilitates the numerical control linkage of multi-axes such as three-axes and four-axes, meets the remote control requirements, and avoids the winding of the cable during the high-speed continuous rotation when transmitting the power and data signal from the fixed position to the rotating position. The lever 83 is connected to the stationary part 82 and does not rotate with the rotating part of the motorized spindle 2, and is located outside the driving assembly 4, which can prevent the cable from winding around the driving assembly 4 and other components under the driving of the rotating part, and causing damage to the electrical components.

[0048] The working process of the rotary lifting mechanism for valve machining is as follows:

[0049] The operator installs the valve machining tool at the mounting end 10 of the screw key shaft 11 according to the machining needs of the valve. When the motorized spindle 2 rotates, the female spline 12 on the motorized spindle 2 rotates, thereby driving the screw key shaft 11 to rotate. At the same time, the fixed seat 5 on the motorized spindle 2 also rotates, thereby driving the screw nut 13 to rotate, so that the screw nut 13 does not have relative displacement with the screw key shaft 11, but the screw key shaft 11, the female spline 12, and the screw nut 13 synchronously rotate with the axis of the motorized spindle 2 as the rotation axis, thereby realizing the rotation of the mounting end 10 of the screw key shaft 11. When the driving assembly 4 is started, the first gear 31 rotates, thereby driving the second gear 32 and the screw nut 13 fixed thereto to rotate, so that the screw nut 13 has relative displacement with respect to the screw key shaft 11, thereby realizing the lifting of the mounting end 10 of the screw key shaft 11.

[0050] It can be seen that the rotary lifting mechanism for valve machining can realize rotation and lifting by only using the screw key shaft 11, the female spline 12, the screw nut 13, the support bearing 14, the motorized spindle 2, the fixed seat 5, the first gear 31, the second gear 32, and the driving assembly 4, integrates the rotary lifting structure, has compact structure, small size, and high precision, and can meet the machining operation such as valve seat cutting of small space valve body.

[0051] Embodiment 2

[0052] The embodiment provides a machining device for valve machining, as shown in Figure 4As shown, it comprises the rotary lifting mechanism for valve machining described in Embodiment 1, and further comprises a machining tool installed at the mounting end 10 of the rotary lifting mechanism. The machining tool includes but is not limited to one or more of a feeding mechanism, a boring tool, a milling tool, and a grinding tool, and a person skilled in the art can select a suitable machining tool according to the actual needs of valve repair machining and other operations.

[0053] It should be noted that the extended linkage shaft can be connected through the cable of the mounting end 10 and the slip ring assembly 8, so as to realize multi-axis numerical control linkage such as three-axis and four-axis linkage, so as to meet the machining requirements of inclined surfaces or complex curved surfaces, and meet the remote control requirements of the machining device.

[0054] In this embodiment, a specific implementation is provided, and the machining tool comprises a sliding table 91 and a boring tool 92 installed on the sliding table 91. The sliding table 91 can be a conventional electric screw rod sliding table in the prior art. In this embodiment, the sliding table 91 is driven by a motor 93, and the motor 93 is fixed to one side of the screw rod spline shaft 11 through a mounting component. In this way, the space at the end of the screw rod spline shaft 11 can be fully utilized, and the occupied space of the machining device for valve machining is not additionally increased.

[0055] The working process of the machining device for valve machining described in this embodiment is as follows:

[0056] The rotary direction and the lifting height of the boring tool 92 are adjusted by using the rotary lifting mechanism for valve machining, the horizontal position of the boring tool 92 is adjusted by using the sliding table 91, and the position adjustment in three dimensions is realized, so as to meet the machining requirements of inclined surfaces or curved surfaces.

[0057] The above is the preferred embodiment of the present application, and it should be noted that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A rotary lift mechanism for valve machining, characterized by, The utility model relates to a valve machining tool transmission shaft assembly, including: Transmission shaft assembly (1), transmission shaft assembly (1) have the installation end (10) of installation valve machining tool; Electrical spindle (2), electrical spindle (2) are fixedly connected with transmission shaft assembly (1), make transmission shaft assembly (1) can revolve around the axis of rotation of electrical spindle (2); Lifting assembly (3), lifting assembly (3) are connected with transmission shaft assembly (1), make transmission shaft assembly (1) can lift along the axis direction of electrical spindle (2); Drive assembly (4), the power output end of drive assembly (4) is connected with lifting assembly (3), can provide drive force to lifting assembly (3); Transmission shaft assembly (1) includes lead screw spline shaft (11), spline female (12), lead screw nut (13);Spline female (12) is installed on the spline groove of lead screw spline shaft (11);Lead screw nut (13) is installed on the lead screw thread of lead screw spline shaft (11);The installation end (10) is located at the end of lead screw spline shaft (11);Support bearing (14);Support bearing (14) surrounds the outer periphery of lead screw nut (13); Transmission shaft assembly (1) is connected with electrical spindle (2) through fixed seat (5); The fixed seat (5) is fixed on the electrical spindle (2);The inside of fixed seat (5) has the cavity of containing support bearing (14), and lead screw nut (13) is fixed on fixed seat (5) through support bearing (14); Spline female (12) is fixed on electrical spindle (2), makes lead screw spline shaft (11) with electrical spindle (2) coaxial; The outer wall of fixed seat (5) is equipped with fixed plate (6), and drive assembly (4) is fixed on fixed seat (5) through fixed plate (6); Lifting assembly (3) includes first gear (31), second gear (32);First gear (31) is engaged with second gear (32), and second gear (32) is fixed with lead screw nut (13);When first gear (31) rotates, second gear (32) drives lead screw nut (13) to rotate, so that lead screw nut (13) generates relative displacement relative to lead screw spline shaft (11); The power output end of drive assembly (4) is connected with first gear (31); Protective cover (7), protective cover (7) is sleeved on first gear (31), second gear (32) outside; Slip ring assembly (8);Slip ring assembly (8) is fixed on protective cover (7); Slip ring assembly (8) includes rotating part (81), stationary part (82), shift lever (83);Rotating part (81) is fixedly connected with protective cover (7), stationary part (82) is connected with the fixed structure of equipment, shift lever (83) is connected with stationary part (82), extends along the length direction of transmission shaft assembly (1), and is located at the outside of drive assembly (4); The mounting end (10) is extended with a linkage shaft, and a cable of the linkage shaft is connected with the slip ring assembly (8).

2. A machining device for valve machining, characterized by A rotary lifting mechanism for valve machining is provided.

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