A broaching device for metal spare parts of power tools

Abstract

The present invention relates to the field of broaching technology, and specifically discloses a broaching device for metal spare parts of electric tools, which specifically includes: a workbench, both ends of the top of the workbench are fixedly connected with hydraulic push rods, and one end of the hydraulic push rod is fixedly connected with a clamping device; a support frame, the support frame is fixed at the center position of the top of the workbench, the top of the support frame is fixedly connected with a three-jaw chuck, and cleaning devices are fixedly connected to both sides of the top of the support frame where the three-jaw chuck is located; a recovery tank, the recovery tank is opened on the top of the workbench, a recovery cavity is opened in the part of the workbench below the recovery tank, and a filter hole communicating with the recovery cavity is opened at the bottom of the recovery tank; a cooling water pump, the water inlet of the cooling water pump is communicated with one side of the recovery cavity. This broaching device for metal spare parts of electric tools can freely replace different broaches without the need to remove and reinstall steps, the broach replacement operation is simple, and the coaxiality is relatively good.

Description

Technical Field

[0001] The present invention relates to the technical field of broaching, and specifically relates to a broaching device for metal spare parts of electric tools. Background Art

[0002] Broaching refers to using a special broach to successively cut off very thin metal layers from the workpiece tooth by tooth, so that the surface reaches a high dimensional accuracy and a low roughness. It is a high-efficiency machining method. During broaching, the broach forms the machined surface in one cut, so the broaching machine only has a main motion and no feed motion. The chips cut by broaching are thin and the cutting motion is stable, so it has a high machining accuracy and a small surface structure value. At present, when replacing the broach after one broaching operation with the existing broaching equipment, it is necessary to remove the broach and then re-clamp the broach, which is rather troublesome to operate. Moreover, the broach cannot be cleaned after broaching, making it inconvenient to use. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the present invention provides a broaching device for metal spare parts of electric tools, which solves the problems that when replacing the broach after one broaching operation with the existing broaching equipment, it is necessary to remove the broach and then re-clamp the broach, which is rather troublesome to operate, and the broach cannot be cleaned after broaching, making it inconvenient to use.

[0004] To achieve the above objectives, the present invention is realized through the following technical solutions: A broaching device for metal spare parts of electric tools specifically includes:

[0005] A workbench, both ends of the top of the workbench are fixedly connected with hydraulic push rods, and one end of each hydraulic push rod is fixedly connected with a clamping device;

[0006] A support frame, which is fixed at the center of the top of the workbench. A three-jaw chuck is fixedly connected to the top of the support frame, and cleaning devices are fixedly connected to both sides of the top of the support frame where the three-jaw chuck is located;

[0007] A recovery tank, which is opened on the top of the workbench. A recovery cavity is opened in the part of the workbench interior below the recovery tank, and a filter hole communicating with the recovery cavity is opened at the bottom of the recovery tank;

[0008] A cooling water pump, the water inlet of which is communicated with one side of the recovery cavity, and the water outlet of which is communicated with the cleaning device;

[0009] The clamping device includes:

[0010] A support plate, on one side of which an annular sliding groove is opened, and a rotating device is fixedly connected to the center position of the annular sliding groove on one side of the support plate;

[0011] Fixing frame, which is arranged on one side of the support plate. A connecting support rod is fixedly connected to the side of the fixing frame close to the support plate. One end of the connecting support rod away from the fixing frame is fixedly connected with a limiting slider. The center position of one side of the fixing frame is fixedly connected with a rotating device;

[0012] Fixing disk, one side of which is fixedly connected with the fixing frame. A fixing groove is opened at the center position of the side of the fixing disk away from the fixing frame;

[0013] Retractable push rod, which is fixed on the side of the fixing disk close to the fixing groove. A clamping head is fixedly connected to the bottom of the retractable push rod.

[0014] A clamping device is provided. During use, the broach can be placed inside the fixing groove on one side of the fixing disk. Since there are multiple groups of fixing disks, multiple groups of broaches can be fixed on one side of the fixing frame. After the broach is placed inside the fixing groove, the retractable push rod can drive the clamping head to insert into the clamping groove at the end of the broach, and then the broach can be fixed inside the fixing groove. When a group of broaches has completed broaching, the fixing frame can be rotated. The fixing frame rotates under the support of the rotating device and the limiting slider, and drives the broach to rotate. When the broach rotates to a suitable position, the broach is driven by the hydraulic push rod to pass through the workpiece and be fixed to the other end of the inserted fixing disk. Different broaches can be freely replaced without the steps of removing and reinstalling, and the broach replacement operation is simple.

[0015] Preferably, a broach is slidably connected inside the fixing groove, and clamping grooves adapted to the clamping head are opened at both ends of the broach inside the fixing groove.

[0016] Preferably, the side of the support plate away from the annular chute is fixedly connected to the movable end of the hydraulic push rod. The connecting support rods and the fixing disks are both provided with multiple groups and are evenly distributed on the fixing frame. The limiting slider is arranged inside the annular chute and is slidably connected to the inner wall of the annular chute. The connecting support rods and the limiting slider are provided. When the broach is subjected to a pulling force, the pulling force of the broach is transmitted to the fixing disk through the clamping head and the retractable push rod, and then transmitted to the connecting support rods and the limiting slider through the fixing disk. The pulling force of the broach can be borne through the cooperation of the limiting slider and the annular limiting groove, avoiding the pulling force of the broach acting on the rotating device and facilitating the protection of the rotating device.

[0017] Preferably, the rotating device includes a positioning disk. The inner wall of the positioning disk is rotatably connected to a rotating disk through a rotating bolt. An arc-shaped chute is provided on the side of the inner wall of the positioning disk. A telescopic groove corresponding to the arc-shaped chute one by one is provided on the side of the rotating disk. A limiting disk is slidably connected to the inner wall of the telescopic groove. An arc-shaped spring is provided between the inner wall of the telescopic groove and the limiting disk. One side of the rotating disk is fixedly connected to a rotating column. A rotating device is provided. When the broach needs to be replaced, rotate the fixing frame. The fixing frame drives the rotating column to rotate. The rotating column drives the rotating disk to rotate. The rotating disk drives the limiting disk to rotate through the telescopic groove. While the limiting disk rotates, it is squeezed by the inner wall of the arc-shaped chute and moves into the interior of the telescopic groove, and squeezes the arc-shaped spring. When the limiting disk completely enters the interior of the telescopic groove, the rotating disk continues to rotate. When the limiting disk moves to the position of the next group of arc-shaped chutes driven by the telescopic groove, the limiting disk can extend into the arc-shaped chute under the thrust of the arc-shaped spring to fix the limiting disk. The rotation and fixing operations are relatively convenient. Since the arc-shaped chutes correspond to the fixing disks one by one, the rotating disk can be rotated to a suitable angle through the cooperation of the limiting disk and the arc-shaped chute, which is convenient for ensuring the coaxiality.

[0018] Preferably, one side of the positioning disk is fixedly connected to the support plate. One end of the rotating column penetrates through the positioning disk and is fixedly connected to the fixing frame.

[0019] Preferably, both ends of the arc-shaped spring are fixedly connected to the inner wall of the telescopic groove. The radian of the limiting disk is adapted to the arc of the inner wall of the arc-shaped chute. Multiple groups of arc-shaped chutes are provided and correspond to the fixing disks one by one.

[0020] Preferably, the cleaning device includes a cleaning pipe. The cleaning pipe is arranged in a ring shape. An inclined nozzle is communicated with the inner side of the cleaning pipe. One side of the cleaning pipe is fixedly connected to an annular fixing ring. A cleaning brush is fixedly connected to the inner wall of the annular fixing ring. A cleaning device is provided. After the broach passes through the workpiece inside the three-jaw chuck, it passes through the inside of the annular fixing ring and the cleaning pipe. When passing through, the cleaning brush inside the annular fixing ring can brush the broach to loosen and brush off the residual debris on the broach. When the broach passes through the fixing ring and enters the interior of the cleaning pipe, the cooling water pump sends cooling water into the interior of the cleaning pipe and sprays it on the broach through the inclined nozzle on the inner side of the cleaning pipe. The inclined nozzle faces the tangent direction of the broach, so that the cooling water can be sprayed into the gap between the debris and the broach, which is convenient for flushing away the debris that the cleaning brush has not cleaned while cooling, and the cleaning effect is better.

[0021] Preferably, one side of the cleaning pipe is communicated with the water outlet of the cooling water pump. One side of the annular fixing ring is fixedly connected to the support frame through a bracket.

[0022] The present invention provides a broaching device for metal spare parts of electric tools. It has the following beneficial effects:

[0023] (1). The broaching equipment for metal parts of an electric tool is provided with a clamping device. During use, the broach can be placed inside the fixing groove on one side of the fixing disk. Since there are multiple groups of fixing disks, multiple groups of broaches can be fixed on one side of the fixing frame. After the broach is placed inside the fixing groove, the chuck can be driven by the telescopic push rod to insert into the clamping groove at the end of the broach, and then the broach can be fixed inside the fixing groove. After a group of broaches finishes broaching, the fixing frame can be rotated. The fixing frame rotates under the support of the rotating device and the limiting slider, and drives the broach to rotate. When the broach rotates to a suitable position, the broach is driven by the hydraulic push rod to pass through the workpiece and be fixed to the fixing disk at the other end. Different broaches can be freely replaced without the steps of removal and reinstallation, and the broach replacement operation is simple.

[0024] (2). The broaching equipment for metal parts of an electric tool is provided with a connecting support rod and a limiting slider. When the broach is subjected to a pulling force, the pulling force of the broach is transmitted to the fixing disk through the chuck and the telescopic push rod, and then transmitted to the connecting support rod and the limiting slider through the fixing disk. The limiting slider and the annular limiting groove can cooperate to bear the pulling force of the broach, avoiding the pulling force of the broach acting on the rotating device and facilitating the protection of the rotating device.

[0025] (3). The broaching equipment for metal parts of an electric tool is provided with a rotating device. When a broach needs to be replaced, the fixing frame is rotated. The fixing frame drives the rotating column to rotate, the rotating column drives the rotating disk to rotate, the rotating disk drives the limiting disk to rotate through the telescopic groove. While the limiting disk rotates, it is squeezed by the inner wall of the arc-shaped chute and moves into the telescopic groove, and squeezes the arc-shaped spring. When the limiting disk completely enters the telescopic groove, the rotating disk continues to rotate. When the limiting disk moves to the position of the next group of arc-shaped chutes driven by the telescopic groove, the limiting disk can be pushed by the arc-shaped spring to extend into the arc-shaped chute to fix the limiting disk. The rotation and fixing operations are relatively convenient. Since the arc-shaped chute corresponds to the fixing disk one by one, the rotating disk can be rotated to a suitable angle through the cooperation of the limiting disk and the arc-shaped chute, which is convenient to ensure the coaxiality.

[0026] (4). The broaching equipment for metal parts of an electric tool is provided with a cleaning device. After the broach passes through the workpiece inside the three-jaw chuck, it passes through the annular fixing ring and the cleaning pipe. When passing through, the broach can be brushed by the cleaning brush inside the annular fixing ring to loosen and brush off the residual debris on the broach. When the broach passes through the fixing ring and enters the cleaning pipe, the cooling water pump sends cooling water into the cleaning pipe and sprays it on the broach through the inclined nozzles on the inner side of the cleaning pipe. The inclined nozzles face the tangential direction of the broach, so that the cooling water can be sprayed into the gap between the debris and the broach, which is convenient to wash away the debris that the cleaning brush has not cleaned while cooling, and the cleaning effect is better. Description of the Drawings

[0027] Figure 1Schematic structural diagram of the present invention;

[0028] Figure 2 Schematic cross-sectional structural diagram of the present invention;

[0029] Figure 3 Schematic structural diagram of the clamping device of the present invention;

[0030] Figure 4 Schematic internal structural diagram of the clamping device of the present invention;

[0031] Figure 5 Schematic internal structural diagram of the rotating device of the present invention;

[0032] Figure 6 Schematic structural diagram of the cleaning device of the present invention;

[0033] Figure 7 Schematic internal structural diagram of the cleaning device of the present invention.

[0034] In the figure: 1, workbench; 2, hydraulic push rod; 3, clamping device; 31, support plate; 32, annular chute; 33, rotating device; 331, positioning disk; 332, rotating disk; 333, arc chute; 334, telescopic chute; 335, limiting disk; 336, arc spring; 337, rotating column; 34, fixing frame; 35, connecting support rod; 36, limiting slider; 37, fixing disk; 38, fixing groove; 39, telescopic push rod; 30, chuck; 4, support frame; 5, three-jaw chuck; 6, cleaning device; 61, cleaning pipe; 62, inclined spray head; 63, fixing ring; 64, cleaning brush; 7, recovery tank; 8, recovery cavity; 9, cooling water pump. Specific embodiments

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] Embodiment 1: Please refer to Figures 1 - 4 , the present invention provides a technical solution: a broaching device for metal parts of electric tools, specifically including:

[0037] A workbench 1, both ends of the top of the workbench 1 are fixedly connected with hydraulic push rods 2, and one end of the hydraulic push rod 2 is fixedly connected with a clamping device 3;

[0038] Support frame 4, which is fixed at the center of the top of the workbench 1. A three-jaw chuck 5 is fixedly connected to the top of the support frame 4. Cleaning devices 6 are fixedly connected to both sides of the top of the support frame 4 where the three-jaw chuck 5 is located;

[0039] Recovery tank 7, which is opened on the top of the workbench 1. A recovery cavity 8 is opened in the part of the workbench 1 below the recovery tank 7. Filter holes communicating with the recovery cavity 8 are opened at the bottom of the recovery tank 7;

[0040] Cooling water pump 9, whose water inlet is communicated with one side of the recovery cavity 8, and whose water outlet is communicated with the cleaning device 6;

[0041] The clamping device 3 includes:

[0042] Support plate 31, on one side of which an annular chute 32 is opened. A rotating device 33 is fixedly connected to the center position of the annular chute 32 on one side of the support plate 31;

[0043] Fixed frame 34, which is arranged on one side of the support plate 31. A connecting support rod 35 is fixedly connected to the side of the fixed frame 34 close to the support plate 31. A limiting slider 36 is fixedly connected to the end of the connecting support rod 35 far from the fixed frame 34. The center position of one side of the fixed frame 34 is fixedly connected to the rotating device 33;

[0044] Fixed disk 37, whose one side is fixedly connected to the fixed frame 34. A fixing groove 38 is opened at the center position of the side of the fixed disk 37 far from the fixed frame 34;

[0045] Telescopic push rod 39, which is fixed on the side of the fixed disk 37 close to the fixing groove 38. A chuck 30 is fixedly connected to the bottom of the telescopic push rod 39.

[0046] A broach is slidably connected inside the fixing groove 38. Card slots adapted to the chuck 30 are opened at both ends of the broach inside the fixing groove 38.

[0047] The side of the support plate 31 far from the annular chute 32 is fixedly connected to the movable end of the hydraulic push rod 2. Multiple groups of the connecting support rods 35 and the fixed disks 37 are provided and evenly distributed on the fixed frame 34. The limiting slider 36 is arranged inside the annular chute 32 and slidably connected to the inner wall of the annular chute 32.

[0048] A clamping device 3 is provided. During use, the broach can be placed inside the fixing groove 38 on one side of the fixing disk 37. Since there are multiple groups of fixing disks 37, multiple groups of broaches can be fixed on one side of the fixing frame 34. After the broach is placed inside the fixing groove 38, the telescopic push rod 39 can be used to drive the chuck 30 to insert into the clamping groove at the end of the broach, so that the broach can be fixed inside the fixing groove 38. After a group of broaches finish broaching, the fixing frame 34 can be rotated. The fixing frame 34 rotates under the support of the rotating device 33 and the limiting slider 36 and drives the broach to rotate. When the broach rotates to a suitable position, the hydraulic push rod 2 is used to drive the broach to pass through the workpiece and fix it to the fixing disk 37 at the other end. Different broaches can be freely replaced without the steps of removing and reinstalling. The broach replacement operation is simple. The connecting support rod 35 and the limiting slider 36 are provided. When the broach is subjected to a tensile force, the tensile force of the broach is transmitted to the fixing disk 37 through the chuck 30 and the telescopic push rod 39, and then transmitted to the connecting support rod 35 and the limiting slider 36 through the fixing disk 37. The tensile force of the broach can be borne through the cooperation of the limiting slider 36 and the annular limiting groove 32, avoiding the tensile force of the broach acting on the rotating device 33 and facilitating the protection of the rotating device.

[0049] Embodiment 2: Please refer to Figures 1 - 5, on the basis of the first embodiment, the present invention provides a technical solution: The rotating device 33 includes a positioning disk 331. The inner wall of the positioning disk 331 is rotatably connected to a rotating disk 332 through a rotating bolt. An arc-shaped chute 333 is provided on the side of the inner wall of the positioning disk 331. A telescopic groove 334 corresponding to the arc-shaped chute 333 one by one is provided on the side of the rotating disk 332. A limiting disk 335 is slidably connected to the inner wall of the telescopic groove 334. An arc-shaped spring 336 is provided between the inner wall of the telescopic groove 334 and the limiting disk 335. One side of the rotating disk 332 is fixedly connected to a rotating column 337. One side of the positioning disk 331 is fixedly connected to the support plate 31. One end of the rotating column 337 penetrates through the positioning disk 331 and is fixedly connected to the fixing frame 34. Both ends of the arc-shaped spring 336 are fixedly connected to the inner wall of the telescopic groove 334. The radian of the limiting disk 335 is adapted to the arc of the inner wall of the arc-shaped chute 333. There are multiple groups of arc-shaped chutes 333 and they correspond to the fixing disks 37 one by one. The rotating device 33 is provided. When the broach needs to be replaced, rotate the fixing frame 34. The fixing frame 34 drives the rotating column 337 to rotate. The rotating column 337 drives the rotating disk 332 to rotate. The rotating disk 332 drives the limiting disk 335 to rotate through the telescopic groove 334. While the limiting disk 335 rotates, it is squeezed by the inner wall of the arc-shaped chute 333 and moves towards the inside of the telescopic groove 334, and squeezes the arc-shaped spring 336. When the limiting disk 335 completely enters the inside of the telescopic groove 334, the rotating disk 332 continues to rotate. When the limiting disk 335 moves to the position of the next group of arc-shaped chutes 333 driven by the telescopic groove 334, the limiting disk 335 can extend into the arc-shaped chute 333 under the thrust of the arc-shaped spring 336 to fix the limiting disk 335. The rotation and fixing operations are relatively convenient. Since the arc-shaped chutes 333 correspond to the fixing disks 37 one by one, the rotating disk 332 can be rotated to a suitable angle through the cooperation of the limiting disk 335 and the arc-shaped chutes 333, which is convenient for ensuring coaxiality.

[0050] Embodiment 3: Please refer to Figures 1 - 7, on the basis of the first and second embodiments, the present invention provides a technical solution: The cleaning device 6 includes a cleaning pipe 61, the cleaning pipe 61 is arranged in a ring shape, an inclined spray head 62 is communicated with the inner side of the cleaning pipe 61, a ring-shaped fixing ring 63 is fixedly connected to one side of the cleaning pipe 61, a cleaning brush 64 is fixedly connected to the inner wall of the ring-shaped fixing ring 63, one side of the cleaning pipe 61 is communicated with the water outlet of the cooling water pump 9, one side of the ring-shaped fixing ring 63 is fixedly connected to the support frame 4 through a bracket, and a cleaning device 6 is provided. After the broach passes through the workpiece inside the three-jaw chuck 5, it passes through the inside of the ring-shaped fixing ring 63 and the cleaning pipe 61. When passing through, the cleaning brush 64 inside the ring-shaped fixing ring 63 can brush the broach to loosen and brush off the residual chips on the broach. When the broach passes through the fixing ring 63 and enters the inside of the cleaning pipe 61, the cooling water pump 9 sends cooling water into the inside of the cleaning pipe 61 and sprays it on the broach through the inclined spray head 62 on the inner side of the cleaning pipe 61. The inclined spray head 62 faces the tangential direction of the broach, so that the cooling water can be sprayed into the gap between the chips and the broach, which is convenient for flushing away the chips that have not been cleaned by the cleaning brush 64 while cooling, and the cleaning effect is better.

[0051] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art and related fields without creative efforts shall fall within the protection scope of the present invention. The structures, devices, and operation methods not specifically described and explained in the present invention, unless otherwise specified and limited, are implemented according to the conventional means in the art.

Claims

1. A broaching device for metal parts of electric tools, specifically comprising: A workbench (1), wherein both ends of the top of the workbench (1) are fixedly connected to hydraulic push rods (2), and one end of the hydraulic push rod (2) is fixedly connected to a clamping device (3); A support frame (4), the support frame (4) being fixed at the center position of the top of the workbench (1), the top of the support frame (4) being fixedly connected to a three-jaw chuck (5), and the parts of the top of the support frame (4) located on both sides of the three-jaw chuck (5) being fixedly connected to cleaning devices (6); A recovery tank (7), the recovery tank (7) being disposed on the top of the workbench (1); a recovery cavity (8) being disposed in a portion of the workbench (1) below the recovery tank (7); and a filtering hole communicating with the recovery cavity (8) being disposed at the bottom of the recovery tank (7); A cooling water pump (9), wherein a water inlet of the cooling water pump (9) is connected to one side of the recovery cavity (8), and a water outlet of the cooling water pump (9) is connected to the cleaning device (6); The broaching device for metal parts of electric tools is characterized in that the clamping device (3) comprises: A support plate (31), wherein an annular slide groove (32) is formed on one side of the support plate (31), and a rotating device (33) is fixedly connected to one side of the support plate (31) at the center of the annular slide groove (32); A fixing frame (34), the fixing frame (34) being arranged on one side of the support plate (31), a connecting rod (35) being fixedly connected to a side of the fixing frame (34) close to the support plate (31), an end of the connecting rod (35) away from the fixing frame (34) being fixedly connected to a limiting slider (36), and a central position of one side of the fixing frame (34) being fixedly connected to the rotating device (33); A fixing plate (37), one side of the fixing plate (37) being fixedly connected to the fixing frame (34), and a fixing groove (38) being provided at a central position of a side of the fixing plate (37) away from the fixing frame (34); A telescopic push rod (39), the telescopic push rod (39) being fixed to a side of the fixing plate (37) close to the fixing groove (38), and a clamping head (30) being fixedly connected to the bottom of the telescopic push rod (39); A broach is slidably connected inside the fixed groove (38), and both ends of the broach inside the fixed groove (38) are provided with a clamping groove adapted to the clamping head (30); The cleaning device (6) comprises a cleaning tube (61), the cleaning tube (61) is arranged in an annular shape, the inner side of the cleaning tube (61) is connected to an inclined nozzle (62), one side of the cleaning tube (61) is fixedly connected to an annular fixing ring (63), and the inner wall of the annular fixing ring (63) is fixedly connected to a cleaning brush (64); The side of the support plate (31) away from the annular slide groove (32) is fixedly connected to the movable end of the hydraulic push rod (2), the connecting support rod (35) and the fixed plate (37) are provided in multiple groups and are evenly distributed on the fixed frame (34), and the limit slider (36) is arranged inside the annular slide groove (32) and is slidably connected to the inner wall of the annular slide groove (32).

2. The broaching device for metal parts of electric tools according to claim 1, characterized in that: The rotating device (33) comprises a positioning plate (331), the inner wall of the positioning plate (331) being rotatably connected to a rotating plate (332) via a rotating bolt, an arc-shaped sliding groove (333) being provided on the side of the inner wall of the positioning plate (331), a telescopic groove (334) corresponding to the arc-shaped sliding groove (333) being provided on the side of the rotating plate (332), the inner wall of the telescopic groove (334) being slidably connected to a limiting plate (335), an arc-shaped spring (336) being provided between the inner wall of the telescopic groove (334) and the limiting plate (335), and a rotating column (337) being fixedly connected to one side of the rotating plate (332).

3. The broaching device for metal parts of electric tools according to claim 2, characterized in that: One side of the positioning plate (331) is fixedly connected to the support plate (31), and one end of the rotating column (337) passes through the positioning plate (331) and is fixedly connected to the fixing frame (34).

4. The broaching device for metal parts of electric tools according to claim 3, characterized in that: Both ends of the arc spring (336) are fixedly connected to the inner wall of the telescopic slot (334); the curvature of the limit plate (335) matches the curvature of the inner wall of the arc sliding slot (333); and a plurality of groups of arc sliding slots (333) are provided and correspond one to one with the fixed plates (37).

5. The broaching device for metal parts of electric tools according to claim 1, characterized in that: One side of the cleaning pipe (61) is in communication with the water outlet of the cooling water pump (9), and one side of the annular fixing ring (63) is fixedly connected to the support frame (4) via a bracket.

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