Seal weld cutting tool for nuclear power pneumatic stop valve

Abstract

The utility model discloses a nuclear power pneumatic stop valve seal weld cutting tool, which comprises a rotary sliding table, a supporting seat, a rotary knife rest and a cutting module, the rotary sliding table is provided with a rotary part and a fixed part, one end of the supporting seat is connected and matched with the fixed part of the rotary sliding table, and the other end of the supporting seat is fixedly matched with a stop valve. The rotary knife rest is fixedly connected to a rotary part of the rotary sliding table, a valve rod of the stop valve sequentially penetrates through the supporting base and the rotary sliding table, the cutting module is fixedly installed on the rotary knife rest and comprises a cutting knife, and the cutting end of the cutting knife extends to the surface of the sealing weld to conduct rotary cutting. According to the cutting tool, the cutting efficiency is improved, the cutting tool is suitable for cutting in a limited space, meanwhile, manual work is not needed any more, and the cutting quality is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of nuclear electric shut-off valve technology, specifically to a sealing welding and cutting tool for nuclear electric shut-off valves. Background Technology

[0002] Nuclear power plant sites contain a wide variety of pipes and valves. After the main valve body and valve cover are connected, welding is required on the outer cylindrical surface of the connection point. During major overhauls of nuclear power plants, when disassembling and inspecting these valves, the valve body sealing welds need to be ground off online. Due to the lack of specialized tools, an angle grinder is currently used in conjunction with a hand saw or other manual tools to cut the sealing weld areas. Because of the limited space available for some valves on site, cutting with manual tools is inefficient and entirely dependent on the skill of the workers; otherwise, failure to control the cutting position, depth, and flatness can damage the valves. Furthermore, cutting with a hand saw is time-consuming, directly impacting the overhaul schedule and work quality.

[0003] Given the various problems associated with using manual saws for cutting in the specific environment of nuclear power plants, it is necessary to develop a set of targeted sealing weld cutting tools. Utility Model Content

[0004] The purpose of this utility model is to provide a cutting tool for the sealing weld of nuclear electric stop valves, which solves the technical problems mentioned above, such as low cutting efficiency, complete reliance on worker skills, and uncontrollable cutting quality when cutting the sealing weld of nuclear electric stop valves.

[0005] This utility model is achieved through the following technical solution:

[0006] A sealing weld cutting tool for a nuclear electric shut-off valve includes a rotary slide, a support base, a rotary tool holder, and a cutting module. The rotary slide has a rotating part and a fixed part. One end of the support base is connected to the fixed part of the rotary slide, and the other end is fixedly connected to the shut-off valve. The rotary tool holder is fixedly connected to the rotating part of the rotary slide. The valve stem of the shut-off valve passes through the support base and the rotary slide in sequence. The cutting module is fixedly mounted on the rotary tool holder. The cutting module includes a cutting blade, and the cutting end of the cutting blade extends to the surface of the sealing weld for rotary cutting.

[0007] Preferably, the rotary slide is an electrically driven rotary table.

[0008] Preferably, the bottom of the support base is provided with a positioning groove that matches the positioning protrusion on the packing cavity of the shut-off valve.

[0009] Preferably, the support base has a tapered through hole inside, which mates with the outer circumferential surface of the valve stem of the shut-off valve.

[0010] As preferably, two rotating tool holders are fixedly connected to the two sides of the rotating slide, and the rotating tool holder is an angular plate body, and the end of the angular plate body extends to the two sides of the support seat.

[0011] As preferably, the cutting module further comprises a first feeding support, a first speed regulating knob, a first speed regulating gear pair, and a first feeding screw, the first feeding support is mounted on the rotating tool holder, the first speed regulating knob is rotationally connected to the first feeding support, the first speed regulating knob is connected with the first speed regulating gear pair, one end of the first feeding screw is fixedly matched with the first speed regulating gear pair, and the other end of the first feeding screw is threadedly connected with the cutting knife through the first feeding support.

[0012] As preferably, the first speed regulating gear pair comprises a pinion and a gear, the pinion is fixedly sleeved on the outside of the first speed regulating knob, and the gear is located on one side of the pinion and is in meshing connection.

[0013] As preferably, the rotating tool holder is provided with a clamping groove, the first feeding support is provided with a clamping convex matched with the clamping groove, the first feeding support is further provided with a locking knob, the rotating rod of the locking knob is provided with a locking convex, the first feeding support is provided with a through groove, the rotating rod of the locking knob and the locking convex pass through the through groove, the locking convex is clamped and locked on the back of the first feeding support by rotating the locking knob with the rotating rod and the locking convex.

[0014] As preferably, the polishing module further comprises a polishing knife, a second feeding support, a second speed regulating knob, a second speed regulating gear pair, and a second feeding screw, the polishing end of the polishing knife extends to the surface of the sealed weld for rotary polishing.

[0015] The second feeding support is mounted on the rotating tool holder, the second speed regulating knob is rotationally connected to the second feeding support, the second speed regulating knob is connected with the second speed regulating gear pair, one end of the second feeding screw is fixedly matched with the second speed regulating gear pair, and the other end of the second feeding screw is threadedly connected with the polishing knife through the second feeding support.

[0016] As preferably, the second speed regulating gear pair adopts the same structure as the first gear pair.

[0017] The polishing module and the cutting module are symmetrical on the rotating tool holder.

[0018] The second feeding support is connected with the rotary tool holder through a clamping groove and a clamping convex, a locking knob is arranged on the second feeding support, a locking convex is arranged on the rotating rod of the locking knob, a through slot is arranged on the second feeding support, the rotating rod of the locking knob and the locking convex pass through the through slot, and the locking knob is rotated with the rotating rod and the locking convex, so that the locking convex is clamped and locked on the back of the second feeding support.

[0019] Compared with the prior art, the utility model has the advantages and beneficial effects that:

[0020] The sealing welding cutting tool of the nuclear power hydraulic stop valve provided by the utility model embodiment has the advantages that: the whole cutting tool is fixedly installed on the stop valve through the rotary sliding table, the cutting module is arranged on the rotary tool holder, the cutting knife rotates and cuts along with the rotation of the rotary sliding table selection part, automatic cutting can be realized, and the cutting efficiency is improved; meanwhile, the cutting tool is installed on the stop valve, and more structures are not needed in the effective space, so the cutting tool is suitable for cutting in a limited space. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the example embodiments of the utility model, the drawings needed to be used in the embodiments will be briefly introduced as follows, and it should be understood that the following drawings only show some embodiments of the utility model, and therefore should not be regarded as a limitation to the scope, and other related drawings can be obtained by those skilled in the art without creative labor on the premise of not paying.

[0022] In the drawings:

[0023] Figure 1 The structural schematic diagram of the sealing welding cutting tool of the nuclear power hydraulic stop valve provided by the utility model embodiment 1.

[0024] Figure 2 The structural schematic diagram of the internal conical through hole of the cutting tool support seat.

[0025] Figure 3 The three-dimensional structural schematic diagram of the cutting tool.

[0026] Figure 4 The structural schematic diagram of the cutting module.

[0027] Figure 5 The three-dimensional diagram of the cutting module.

[0028] Figure 6 The structural schematic diagram of the through hole slot matched with the locking convex.

[0029] Figure 7Structure diagram of the polishing module.

[0030] Figure 8 Structure diagram of the polishing module.

[0031] Markings in the drawings and corresponding names of parts:

[0032] 1-rotary slide, 2-support seat, 201-tapered through hole, 3-rotary tool holder, 4-polishing module, 401-polishing knife, 402-second feeding support, 403-second speed regulating knob, 404-second speed regulating gear pair, 405-second feeding screw, 5-cutting module, 501-cutting knife, 502-first feeding support, 503-first speed regulating knob, 504-first speed regulating gear pair, 5041-small gear, 5042-large gear, 505-first feeding screw, 506-engaging groove, 507-engaging convex, 508-locking knob, 509-locking convex, 510-through slot hole, 7-positioning bearing, 9-positioning groove, 10-valve, 11-valve rod. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with embodiments and drawings. The schematic embodiments of the present application and the description thereof are only used to explain the present application, and not to limit the present application.

[0034] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application can be practiced without these specific details. In other instances, well-known structures, circuits, materials or processes have not been described in detail in order to avoid obscuring the present application.

[0035] In the entire description, the mention of "one embodiment", "an embodiment", "one example" or "an example" means that the specific features, structures or characteristics described in connection with the embodiment or example are included in at least one embodiment of the present application. Therefore, the phrases "one embodiment", "an embodiment", "one example" or "an example" appearing in various places in the entire description do not necessarily refer to the same embodiment or example. In addition, specific features, structures or characteristics can be combined in one or more embodiments or examples in any appropriate combination and / or sub-combination. In addition, those of ordinary skill in the art should understand that the drawings provided herein are for illustrative purposes and the drawings are not necessarily drawn to scale. The term "and / or" used herein includes any and all combinations of one or more of the relevant listed items.

[0036] In the description of the utility model, the terms "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the protection scope of the utility model.

[0037] Embodiment 1:

[0038] As Figures 1-6 indicated in the description, a sealing weld cutting tool of a nuclear electric dynamic stop valve comprises a rotating sliding table 1, a supporting seat 2, a rotating tool holder 3 and a cutting module 5.

[0039] The rotating sliding table 1 has a rotating part and a fixed part, the rotating part can rotate, the fixed part is fixed, the rotating part is located in the inner layer, and the fixed part is located in the outer layer, the rotating sliding table 1 can adopt an electric self-driving rotating table, and can adopt a finished product rotating table that can be purchased on the market at present, and will not be described in detail here. One end of the supporting seat 2 is fixedly matched with the fixed part of the rotating sliding table 1, and the other end is fixedly matched with the stop valve. During work, the rotating part of the rotating sliding table 1 rotates, and the supporting seat 2 is fixed. The rotating tool holder 3 is fixedly connected to the rotating part of the rotating sliding table 1 and rotates with the rotating part. When in use, the entire cutting tool is installed on the stop valve through the fixation of the supporting seat 2 and the stop valve, and the valve stem 11 of the stop valve penetrates the supporting seat 2 and the rotating part of the rotating sliding table 1 in sequence, and the rotating part and the valve stem 11 are in a rotating matching relationship, for example, the rotating matching of the rotating part and the valve stem 11 can be realized through a bearing, and the valve stem 11 does not rotate when the rotating part rotates. The supporting seat 2 and the valve stem 11 are in a fixed relationship. The cutting module 5 is fixedly installed on the rotating tool holder 3, the cutting module 5 comprises a cutting knife 501, and the cutting end of the cutting knife 501 extends to the surface of the sealing weld to perform rotary cutting, so as to separate the valve 10 main valve body and the valve cover.

[0040] In this embodiment, the entire cutting tool is fixedly installed on the stop valve by setting the rotating sliding table 1, and the cutting module 5 is installed on the rotating tool holder 3. In use, with the rotation of the rotating sliding table 1, the rotating tool holder 3 and the cutting module 5 rotate along the stop valve on one side, and the cutting knife 501 rotates while cutting the seal weld, which can realize automatic cutting and improve cutting efficiency. At the same time, the cutting tool is installed on the stop valve, and it does not need to occupy more structure in the effective space, and it does not need to put hands or tools into the limited space, and it can also realize cutting in the limited space. In this embodiment, the valve stem 11 penetrates the support seat 2 and the rotating sliding table 1, which can ensure the stable connection between the cutting tool and the valve stem 11, the stability of the cutting position, depth and flatness during the rotating cutting process, and the stability of the cutting quality.

[0041] Further, a positioning groove 9 matched with the positioning convex on the stop valve packing cavity is arranged at the bottom of the support seat 2. The positioning groove 9 realizes the positioning function. In use, the lower end of the support seat 2 is pressed against the packing cavity of the valve 10, and the valve stem 11 is fastened to prevent the valve stem 11 from shaking and affecting the centring of the cutting tool. Better, a tapered through hole 201 is arranged in the support seat 2, which is matched with the outer peripheral surface of the valve stem 11 of the stop valve. The tapered through hole 201 is arranged for the axial positioning of the cutting tool and the valve stem 11, which ensures the coaxiality of the rotating center of the cutting tool and the axis of the valve stem 11, avoids the cutting deviation during the rotating cutting, further improves the cutting stability, improves the cutting quality, and does not depend on the skill of the technical worker.

[0042] As a better design, the rotating tool holder 3 is provided with two, which are fixedly connected to the two sides of the rotating sliding table 1, such as being connected by bolts. The rotating tool holder 3 is an angular plate body, which forms an L-shaped structure. The end of the angular plate body away from the rotating sliding table 1 extends to the lower end of the support seat 2 on both sides. The cutting module 5 is installed on one of the rotating tool holders 3, the position of the cutting knife 501 corresponds to the seal weld position, and the cutting end of the cutting knife 501 is in contact with the seal weld position.

[0043] The cutting module 5 further comprises a first feeding support 502, a first speed regulating knob 503, a first speed regulating gear pair 504, and a first feeding screw 505. The first feeding support 502 is mounted on the rotary tool holder 3. The first speed regulating knob 503 is rotationally connected to the first feeding support 502. The first speed regulating knob 503 is connected with the first speed regulating gear pair 504. The first speed regulating gear pair 504 comprises a pinion 5041 and a gear 5042. The pinion 5041 is fixedly sleeved on the outside of the first speed regulating knob 503. The gear 5042 is located on one side of the pinion 5041 and is in meshing connection with the pinion 5041. The pinion 5041 drives the gear 5042 to realize the radial feeding action of the automatic cutting module 5 with a small torque, thereby realizing the manual feeding function. Rotating the first speed regulating knob 503 can drive the pinion 5041 and the gear 5042 to rotate. One end of the first feeding screw 505 is fixedly connected with the first speed regulating gear pair 504, and the other end of the first feeding screw 505 is threadedly connected with the cutting knife 501 through the first feeding support 502. The first feeding screw 505 is in rotational connection with the first feeding support 502. A positioning bearing 7 can be mounted on the first feeding support 502, and the first feeding screw 505 is arranged in the positioning bearing 7.

[0044] During operation, the first speed regulating knob 503 is adjusted to drive the first speed regulating gear pair 504 to rotate with the first feeding screw 505. Since the cutting knife 501 is in threaded connection with the first feeding screw 505, the rotary motion can be converted into linear motion, so that the cutting knife 501 moves in the radial direction. The first speed regulating knob 503, the first speed regulating gear pair 504, and the first feeding screw 505 are arranged to enable the cutting knife 501 to move in the radial direction. The distance between the cutting knife 501 and the sealed weld surface can be adjusted according to the requirement, thereby realizing the feeding and retreating of the cutting knife 501.

[0045] The first speed regulating knob 503 is provided with a scale. The angle of rotation required can be calculated according to the feeding amount, the thread pitch, and the gear ratio each time.

[0046] In this embodiment, a locking groove 506 is also provided on the rotating blade holder 3. The locking groove 506 is designed in the shape of a dovetail groove. A locking protrusion 507 is provided on the first feed bracket 502 to cooperate with the locking groove 506. The locking protrusion 507 can slide into the locking groove 506, thereby allowing the first feed bracket 502 to be detachably and fixedly connected to the rotating blade holder 3, facilitating the installation and removal of the cutting module 5. A locking knob 508 is also provided on the first feed bracket 502. A locking protrusion 509 is provided on the rotating rod of the locking knob 508. A through slot 510 is provided on the first feed bracket 502. The rotating rod of the locking knob 508 and the locking protrusion 509 pass through the through slot 510 to reach the back of the first feed bracket 502. The locking protrusion 509 is perpendicular to the rotating rod of the locking knob 508. When the locking knob 508 is rotated in the opposite direction, the locking protrusion 509 is released from the first feed bracket 502. The locking knob 508 is a fastening part that replaces the bolt. It can be installed, removed, and replaced with one click without the need for tools. It is equipped with the automatic cutting module 5.

[0047] In use, first insert the locking knob 508's rotating rod and locking protrusion 509 into the through slot 510, then rotate the locking knob 508, causing the rotating rod and locking protrusion 509 to rotate. At this time, the locking protrusion 509 is locked in place on the back of the first feed bracket 502, making the cooperation between the first feed bracket 502 and the rotating tool holder 3 more stable. The specific structure of the locking knob 508 in this embodiment can use commercially available finished products, which will not be described in detail here.

[0048] Example 2:

[0049] Based on Example 1, such as Figure 1 , 7 As shown in Figure 8, a grinding module 4 is also included. The grinding module 4 is fixedly mounted on another rotating tool holder 3, and the grinding module 4 and the cutting module 5 are symmetrically positioned on the rotating tool holder 3. The grinding module 4 includes a grinding blade 401, a second feed bracket 402, a second speed control knob 403, a second speed control gear pair 404, and a second feed screw 405. The grinding end of the grinding blade 401 extends to the surface of the sealing weld for rotary grinding. The grinding blade 401 is a flat-head blade.

[0050] The second feed bracket 402 is mounted on the rotary tool holder 3. The second speed control knob 403 is rotatably connected to the second feed bracket 402 and is connected to the second speed control gear pair 404. One end of the second feed screw 405 is fixedly engaged with the second speed control gear pair 404, and the other end passes through the second feed bracket 402 and is threadedly connected to the grinding tool 401. The second speed control gear pair 404 has the same structure as the first gear pair, as shown in Embodiment 1.

[0051] The rotary tool holder 3 provided with the second feeding support 402 is also provided with a clamping groove 506 in the form of a dovetail groove, and the second feeding support 402 is provided with a clamping convex, and the second feeding support 402 and the rotary tool holder 3 are connected through the clamping groove 506 and the clamping convex 507, and the second feeding support 402 is also provided with a locking knob 508, the locking knob 508 is provided with a locking convex 509 on a rotating rod of the locking knob 508, the second feeding support 402 is provided with a through groove hole 510, the rotating rod of the locking knob 508 and the locking convex 509 pass through the through groove hole 510, and the locking knob 508 rotates with the rotating rod and the locking convex 509 to form a structure that the locking convex 509 is clamped and locked on the back of the second feeding support 402.

[0052] The cutting tool is integrally installed on the flange cover of the upper end surface of the valve 10 and is fixed by bolts.

[0053] The automatic polishing module 4 is installed and used as follows:

[0054] The automatic polishing module 4 is slid along the dovetail groove (i.e., the clamping groove 506), and when the center line of the automatic polishing module 4 coincides with the center of the rotary tool holder 3, the quick locking knob 508 is rotated according to the indication of the knob to lock the whole device.

[0055] The second speed adjusting knob 403 is screwed and rotated to drive the second speed adjusting gear pair 404 to rotate, so that the second feeding screw 405 is rotated to convert the rotary motion into linear motion, and the flat-end cutter moves radially and reciprocally to realize manual feeding of the automatic polishing module 4.

[0056] The automatic cutting module 5 is installed and used as follows:

[0057] The automatic cutting module 5 is slid along the dovetail groove, and when the center line of the automatic cutting module 5 coincides with the center of the rotary tool holder 3, the quick locking knob 508 is rotated according to the indication of the knob to lock the whole device.

[0058] The first speed adjusting knob 503 is screwed and rotated to drive the first speed adjusting gear to rotate, so that the first feeding screw 505 is rotated to convert the rotary motion into linear motion, and the cutting cutter 501 moves radially and reciprocally to realize feeding and retracting of the automatic cutting module 5. When the hollow rotary sliding table 1 is powered and rotated, the automatic cutting module 5 rotates around the center axis of the valve rod 11, the cutting cutter 501 acts on the weld surface along the circumference, and the valve 10 is separated from the valve cover.

[0059] The sealing welding cutting tool of the nuclear electric stop valve provided by the utility model has a short cutting time, and can reduce workload and manual operation dose.

[0060] The above detailed description of the embodiments is further detailed to the purpose, technical scheme and beneficial effects of the utility model, and it should be understood that the above is only a specific embodiment of the utility model, and is not used to limit the protection scope of the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A cutting tool for cutting a seal weld of a nuclear electric actuated globe valve, characterized by, The utility model provides a cutting device for sealing welding, including rotary slide (1), support seat (2), rotary tool rest (3), cutting module (5), rotary slide (1) has rotary part and fixed part, one end of support seat (2) is connected with the fixed part of rotary slide (1) and is matched, the other end is fixedly matched with stop valve, rotary tool rest (3) is fixedly connected on the rotary part of rotary slide (1), the valve stem (11) of stop valve is in turn penetrated through support seat (2), rotary slide (1), cutting module (5) is fixedly installed on rotary tool rest (3), cutting module (5) includes cutting knife (501), and the cutting end of cutting knife (501) extends to the surface at sealing welding to carry out rotary cutting.

2. A cutting tool for sealing welds of a nuclear electric globe valve according to claim 1, characterized in that, The rotary slide (1) is an electric self-driving rotary table.

3. A cutting tool for sealing welds of a nuclear electric globe valve according to claim 1, characterized in that, The bottom of the support seat (2) is provided with a positioning groove (9) matched with a positioning convex on the upper gasket cavity of the stop valve.

4. A cutting tool for sealing welds of a nuclear electric globe valve according to claim 1, characterized in that, The inside of the support seat (2) is provided with a tapered through hole (201) matched with the outer peripheral surface of the valve stem (11) of the stop valve.

5. A cutting tool for sealing welds of a nuclear electric globe valve according to claim 1, characterized in that, The rotary tool rest (3) is provided with two, respectively fixedly connected on both sides of the rotary slide (1), the rotary tool rest (3) is an angle plate body, and the end of the angle plate body extends to both sides of the support seat (2).

6. A cutting tool for sealing welds of nuclear electric globe stop valves according to any one of claims 1 to 5, characterized in that, The cutting module (5) further includes a first feeding support (502), a first speed regulating knob (503), a first speed regulating gear pair (504), and a first feeding screw (505). The first feeding support (502) is installed on the rotary tool rest (3). The first speed regulating knob (503) is rotationally connected to the first feeding support (502). The first speed regulating knob (503) is connected with the first speed regulating gear pair (504). One end of the first feeding screw (505) is fixedly matched with the first speed regulating gear pair (504), and the other end is threadedly connected with the cutting knife (501) through the first feeding support (502).

7. A cutting tool for sealing welds of a nuclear electric globe valve according to claim 6, characterized in that, The first speed regulating gear pair (504) includes a pinion (5041) and a gear (5042). The pinion (5041) is fixedly sleeved on the outside of the first speed regulating knob (503). The gear (5042) is located on one side of the pinion (5041) and is in meshing engagement.

8. A cutting tool for sealing welds of a nuclear electric globe valve according to claim 6, characterized in that, The rotary tool rest (3) is provided with a clamping groove (506). The first feeding support (502) is provided with a clamping convex (507) matched with the clamping groove (506). The first feeding support (502) is further provided with a locking knob (508). The rotating rod of the locking knob (508) is provided with a locking convex (509). The first feeding support (502) is provided with a through slot (510). The rotating rod and the locking convex (509) of the locking knob (508) pass through the through slot (510). Rotating the locking knob (508) with the rotating rod and the locking convex (509) rotates to form a structure in which the locking convex (509) is clamped and locked on the back of the first feeding support (502).

9. A cutting tool for sealing welds of a nuclear electric globe valve according to claim 7 or 8, characterized in that, Also include polishing module (4), the polishing module (4) includes polishing knife (401), second feed support (402), second speed regulating knob (403), second speed regulating gear pair (404), second feed screw (405), the polishing end of the polishing knife (401) extends to the surface of the sealed weld to carry out rotary polishing; The second feed support (402) is installed on the rotary tool holder (3), the second speed regulating knob (403) is rotatably connected to the second feed support (402), the second speed regulating knob (403) is connected with the second speed regulating gear pair (404), one end of the second feed screw (405) is fixedly connected with the second speed regulating gear pair (404), and the other end of the second feed screw (405) is threadedly connected with the polishing knife (401) through the second feed support (402).

10. A cutting tool for sealing welds of a nuclear electric globe valve according to claim 9, characterized in that, The second speed regulating gear pair (404) and the first speed regulating gear pair adopt the same structure; The polishing module (4) and the cutting module (5) are symmetrical on the rotary tool holder (3); The second feed support (402) and the rotary tool holder (3) are connected through the clamping groove (506) and the clamping convex (507), the second feed support (402) is provided with a locking knob (508), the rotating rod of the locking knob (508) is provided with a locking convex (509), the second feed support (402) is provided with a through slot (510), the rotating rod of the locking knob (508) and the locking convex (509) pass through the through slot (510), the locking knob (508) is rotated with the rotating rod and the locking convex (509), and the locking convex (509) is locked on the back of the second feed support (402) to form a clamping locking structure.

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