A tool edge honing machine

Abstract

The present invention belongs to the technical field of cutting tool processing. Specifically, it relates to a tool edge honing machine, which includes a machine frame, a honing machine main body, and a tool fixing seat. The honing machine main body includes a honing motor and a grinding wheel arranged on the output shaft of the honing motor. The grinding wheel and the tool fixing seat are arranged correspondingly. The honing machine main body is adjustably connected to one end of the machine frame through an X-direction main shaft feeding mechanism and a Y-direction swinging mechanism. The tool fixing seat is slidably connected to the other end of the machine frame through an adjustable arc swinging mechanism. This device is convenient to operate and has good adjustability. It is suitable for honing the edges of large-arc tools of various specifications, and the ground arcs are more smooth and closer to the true circle effect, which is beneficial to improving the service life of the tools.

Description

Technical Field

[0001] The present invention belongs to the technical field of cutting tool processing, and specifically relates to a tool edge honing machine. Background Art

[0002] Tool edge honing treatment, that is, honing and polishing the tool edge with a brush containing diamond particles to reduce or eliminate the defects of the tool edge, is an essential process after the precision grinding and before the coating of CNC tools. The purpose is to make the edge smooth and flat and extend the tool life. For the grinding of large-arc tool edges, traditional tool honing machines can only grind through the synchronous point movement of the x / y two axes. Microscopically, it can be seen that this arc is composed of countless points. The grinding process is difficult and the tool use effect is not good.

[0003] Therefore, there is an urgent need to develop a new tool edge honing machine. Summary of the Invention

[0004] The purpose of the present invention is to solve the above technical problems and propose a tool edge honing machine.

[0005] The technical solution is as follows: A tool edge honing machine includes a machine frame, a honing machine main body, and a tool fixing seat. The honing machine main body includes a honing motor and a grinding wheel arranged on the output shaft of the honing motor. The grinding wheel and the tool fixing seat are correspondingly arranged. The honing machine main body is adjustably connected to one end of the machine frame through an X-axis main shaft feeding mechanism and a Y-axis swing mechanism. The tool fixing seat is slidably connected to the other end of the machine frame through an adjustable arc swing mechanism.

[0006] Preferably, the adjustable arc swing mechanism includes a swing arm, a swing arm rotation center adjustment component, and a Y-direction traction mechanism. The tool fixing seat is connected to one end of the swing arm close to the honing machine body. A long through hole is provided at the end of the swing arm away from the tool fixing seat. The swing arm rotation center adjustment component includes a first rotating seat, a first linear guide rail, a first sliding table, a first lead screw, and a hand wheel. The two ends of the first lead screw are respectively connected to the machine frame through a first bearing seat. The first lead screw and the first linear guide rail are arranged in parallel. The first sliding table is slidably connected to the first linear guide rail, and the bottom of the first sliding table is threadedly connected to the first lead screw. A hand wheel is provided at the end of the first lead screw away from the honing machine body. The first rotating seat is rotatably connected to the first sliding table, and a central shaft and a locking component are provided at the top of the first rotating seat. The locking component is used to lock and connect the swing arm and the first rotating seat during operation. The central shaft slidably passes through the long through hole. The Y-direction traction mechanism includes a first servo motor, a second lead screw, a second linear guide rail, a second sliding table, a third linear guide rail, a third sliding table, and a second rotating seat. The first servo motor and the second linear guide rail are both connected to the machine frame. The second lead screw is arranged in parallel with the second linear guide rail, and the two ends of the second lead screw are respectively connected to the machine frame through a second bearing seat. The output shaft of the first servo motor is drivingly connected to the second lead screw. The second sliding table is slidably connected to the second linear guide rail, and the bottom of the second sliding table is threadedly connected to the second lead screw. The third linear guide rail is provided on the second sliding table and is perpendicular to the second linear guide rail. The third sliding table is slidably connected to the third linear guide rail. The second rotating seat is rotatably connected to the third sliding table, and the top of the second rotating seat is connected to the swing arm through a connecting rod. The connecting rod is arranged corresponding to the tool fixing seat up and down. By driving the hand wheel to move the swing arm rotation center back and forth, the size of the blade edge arc can be adjusted. By the reciprocating movement of the Y-direction traction mechanism, the arc movement trajectory is made more smooth. At the same time, the X-direction main shaft feeding mechanism drives the grinding wheel to move forward to achieve the grinding effect. The ground arc is close to the true circle effect, which is more smooth than the arc generated by the traditional X / Y two-axis movement, thus being beneficial to improving the service life of the tool.

[0007] Further, a grating scale is also provided on the machine frame, and a protective cover is provided outside the grating scale. The grating scale is arranged in parallel and corresponding to the first linear guide rail. The radius position of the tool edge arc is displayed more accurately through the grating scale.

[0008] Preferably, the locking component includes two connecting bolts. Both connecting bolts pass through the long through hole and are symmetrically distributed on both sides of the central shaft. A compression nut is threadedly connected to the top of the connecting bolt. The top of the compression nut presses on the upper part of the swing arm, and the lower part of the compression nut is clamped in the long through hole. Guide planes are provided on both sides of the central shaft, and the guide planes are slidably connected to the corresponding side hole walls of the long through hole, which is convenient for realizing the convenient adjustment of the swing arm rotation center and the quick locking of the swing arm and the first rotating seat after adjustment.

[0009] Preferably, a storage groove is provided on the frame. The storage groove is correspondingly arranged below the grinding wheel and the tool fixing seat for storing debris during the honing process, making the device more environmentally friendly during operation. And a clearance hole corresponding to the second rotating seat is provided on the storage groove, so as not to interfere with the normal operation of the adjustable arc swing mechanism.

[0010] Preferably, a limiting frame is provided on the frame. The limiting frame is connected to the frame by bolts and is correspondingly arranged at one end of the swing arm away from the tool fixing seat. The limiting frame is used to limit the maximum adjustment arc of the swing arm.

[0011] Preferably, the X-axis main shaft feeding mechanism includes a second servo motor, a third lead screw, a fourth linear guide rail and a fourth slide table provided on the top of the frame. The third lead screw is arranged in parallel with the fourth linear guide rail, and both ends of the third lead screw are connected to the frame through bearing blocks. The fourth slide table is slidably connected to the fourth linear guide rail, and the bottom of the fourth slide table is threadedly connected to the third lead screw. The second servo motor is drivingly connected to the third lead screw. Both ends of the fourth slide table are provided with a first telescopic cover. One end of the first telescopic cover away from the fourth slide table is connected to the frame, and the first telescopic cover covers the upper part of the first linear guide rail. A first protective cover is provided outside the second servo motor. The second servo motor drives the third lead screw to rotate, driving the fourth slide table to feed or retreat in the X direction. The first telescopic cover and the first protective cover are provided to protect the internal structure thereof.

[0012] Preferably, the Y-axis swing mechanism includes a fifth slide table, a fifth linear guide rail and a swing motor provided on the fourth slide table. The swing motor is arranged at one end of the fourth slide table, and a turntable is provided on the output shaft of the swing motor. A swing rod is eccentrically hinged on the turntable. One end of the swing rod away from the turntable is hingedly connected to the fifth slide table. The fifth slide table is slidably connected to the fourth slide table through the fifth linear guide rail, and the fifth linear guide rail is arranged perpendicular to the fourth linear guide rail. The honing motor is fixed on the fifth slide table. The swing motor can drive the fifth slide table to swing back and forth in the Y direction on the fourth slide table.

[0013] Preferably, a second protective cover is provided on one side of the honing motor corresponding to the swing motor. The second protective cover covers the upper part of the fifth linear guide rail and the swing motor. One end of the fifth slide table away from the swing motor is connected to the fourth slide table through a second telescopic cover. The second telescopic cover covers the upper part of the fifth linear guide rail. By providing the second protective cover and the second telescopic cover, it is beneficial to protect the internal structure thereof and extend the service life of the device.

[0014] Preferably, it further includes a PLC controller with a touch screen. The honing motor, the first servo motor, the second servo motor and the swing motor are respectively electrically connected to the PLC controller. By inputting corresponding processing parameters through the PLC controller, automatic and efficient processing of the device can be realized.

[0015] Preferably, telescopic covers III are provided at both ends of the first sliding table, and the telescopic covers III cover the upper part of the first linear guide rail. A protective cover III is provided outside the first servo motor. Telescopic covers IV are respectively provided on both sides of the second sliding table. One end of the telescopic cover IV away from the second sliding table is connected to the machine frame, and the other end of the telescopic cover IV away from the second sliding table is connected to the protective cover III. A protective cover IV is provided on the third sliding table, and the protective cover IV covers the upper part of the third linear guide rail. One end of the telescopic cover III away from the first sliding table is connected to the machine frame, and the other end of the telescopic cover III away from the first sliding table is connected to the protective cover IV. Through the arrangement of the telescopic cover III, the telescopic cover IV, the protective cover III and the protective cover IV, it is beneficial to protect the internal structure and extend the service life of the device.

[0016] The present invention further includes other components that can make a tool edge honing machine work properly, which are all conventional means in the art. In addition, the devices or components not defined in the present invention, such as the honing motor, the first servo motor, the second servo motor, the swing motor, the PLC controller, each linear guide rail and the lead screw, etc., all adopt the existing technologies in the art, and those skilled in the art can select the specifications and models of the corresponding components according to actual needs.

[0017] The working principle of the present invention is that when in use, first fix the tool on the tool fixing seat, then accurately adjust the gap between the grinding wheel on the honing motor and the tool through the X-direction main shaft feeding mechanism, and then adjust the swing arc of the tool fixing seat through the adjustable arc swing mechanism according to the arc of the tool edge, and then make the honing machine body swing back and forth along the Y direction through the Y-direction swing mechanism, so as to realize the efficient and accurate honing processing of the tool edge arc.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: the device is convenient to operate, has good adjustability, is suitable for honing the edges of large-arc tools of various specifications, and the ground arcs are more smooth, approaching the true circle effect, which is beneficial to improving the service life of the tools. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention in the embodiment.

[0020] Figure 2 It is a schematic diagram of the partial structure of the present invention in the embodiment.

[0021] Figure 3 It is a schematic diagram of the overall structure of the adjustable arc swing mechanism in the embodiment.

[0022] Figure 4 For Figure 3 A partial structure schematic diagram of one perspective.

[0023] Figure 5 For Figure 3 A partial structure schematic diagram of another perspective.

[0024] Figure 6 Schematic diagram of the overall structure of the first rotating seat of the present invention in the implementation.

[0025] Figure 7 Schematic diagram of the structure of the Y-direction traction mechanism of the present invention in the embodiment.

[0026] Figure 8 Schematic diagram of the combined structure of the honing machine main body, the X-direction main shaft feeding mechanism and the Y-direction swinging mechanism of the present invention in the embodiment.

[0027] Figure 9 For Figure 8 Partial structure schematic diagram of one perspective.

[0028] Figure 10 For Figure 9 Partial structure schematic diagram of another perspective. Specific implementation manner;

[0030] The following further describes the technology of the present invention in detail with reference to the accompanying drawings and specific implementation manners.

[0031] Embodiment 1:

[0032] As Figure 1 shown, this embodiment proposes a tool edge honing machine, which is suitable for honing large-arc tool edges with a radius of 350-800 mm. It includes a frame 1, a honing machine main body and a tool fixing seat 2. The honing machine main body includes a honing motor 3 and a grinding wheel 4 arranged on the output shaft of the honing motor. The grinding wheel and the tool fixing seat are arranged corresponding to each other. The honing machine main body is adjustably connected to one end of the frame through an X-direction main shaft feeding mechanism and a Y-direction swinging mechanism. The tool fixing seat is slidably connected to the other end of the frame through an adjustable arc swinging mechanism.

[0033] As Figures 2 to 5 described, the adjustable arc swinging mechanism includes a swing arm 5, a swing arm rotation center adjustment component and a Y-direction traction mechanism. The tool fixing seat is connected to one end of the swing arm close to the honing machine main body. A long strip through hole 6 is provided at the end of the swing arm away from the tool fixing seat. The swing arm rotation center adjustment component includes a first rotating seat 7, a first linear guide rail 8, a first slide table 9, a first lead screw 10 and a hand wheel 11. The two ends of the first lead screw are respectively connected to the frame through bearing seats. The first lead screw and the first linear guide rail are arranged in parallel. The first slide table is slidably connected to the first linear guide rail and the bottom of the first slide table is threadedly connected to the first lead screw. A hand wheel is provided at the end of the first lead screw away from the honing machine main body. The first rotating seat is rotatably connected to the first slide table and a central shaft 12 and a locking component are provided at the top of the first rotating seat. The locking component is used to lock and connect the swing arm and the first rotating seat during operation. The central shaft slidably penetrates through the long strip through hole;

[0034] As shown Figure 7 in the figure, the Y-direction traction mechanism includes a first servo motor 13, a second lead screw 14, a second linear guide rail 15, a second slide table 16, a third linear guide rail 17, a third slide table 18, and a second rotating seat 19. The first servo motor and the second linear guide rail are both connected to the frame. The second lead screw is arranged in parallel with the second linear guide rail, and both ends of the second lead screw are connected to the frame through second bearing seats. The output shaft of the first servo motor is in transmission connection with the second lead screw. The second slide table is slidably connected to the second linear guide rail, and the bottom of the second slide table is threadedly connected to the second lead screw. The third linear guide rail is arranged on the second slide table and is perpendicular to the second linear guide rail. The third slide table is slidably connected to the third linear guide rail. The second rotating seat is rotatably connected to the third slide table, and the top of the second rotating seat is connected to the swing arm through a connecting rod 20, and the connecting rod and the tool fixing seat are arranged vertically corresponding to each other. By driving the swing arm rotation center to move back and forth through the handwheel to adjust the size of the blade edge arc, and through the reciprocating movement of the Y-direction traction mechanism, the arc movement trajectory becomes more smooth. At the same time, the X-direction main shaft feeding mechanism drives the grinding wheel to move forward to achieve the grinding effect. The ground arc is close to the true circle effect, which is more smooth than the arc generated by the traditional X / Y two-axis movement, thus being beneficial to improving the service life of the tool.

[0035] As shown Figure 6 in the figure, the locking assembly includes two connecting bolts 42. Both connecting bolts are arranged in the long strip through holes and symmetrically distributed on both sides of the central axis. The top of the connecting bolt is threadedly connected with a compression nut 43. The top of the compression nut presses above the swing arm, and the lower part of the compression nut is clamped in the long strip through hole. Guide planes are arranged on both sides of the central axis, and the guide planes are slidably connected with the corresponding side hole walls of the long strip through hole, which is convenient for realizing the convenient adjustment of the swing arm rotation center and the quick locking of the swing arm and the first rotating seat after adjustment. A limit frame 44 is arranged on the frame. The limit frame is connected to the frame through bolts and corresponds to the end of the swing arm far from the tool fixing seat. The limit frame is used to limit the maximum adjustment arc of the swing arm.

[0036] As shown Figure 2 、 Figure 5 in the figure, specifically, a grating scale 21 is further arranged on the frame, and a protective cover 22 is arranged outside the grating scale. The grating scale is parallel and correspondingly arranged with the first linear guide rail. Through the grating scale, the radius position of the tool edge arc is displayed more accurately. A storage groove 23 is arranged on the frame. The storage groove is correspondingly arranged below the grinding wheel and the tool fixing seat and is used to store the debris during the honing process, making the device more environmentally friendly during the working process. And a relief hole corresponding to the second rotating seat is arranged on the storage groove, so as not to interfere with the normal working of the adjustable arc swing mechanism.

[0037] In this embodiment, as shown Figures 8 to 10As shown in the figure, the X-axis main spindle feeding mechanism includes a servo motor two 24, a lead screw three 25, a linear guide four 26 and a slide table four 27 provided on the top of the frame. The lead screw three is arranged parallel to the linear guide four, and both ends of the lead screw three are connected to the frame through bearing blocks three. The slide table four is slidably connected to the linear guide four, and the bottom of the slide table four is threadedly connected to the lead screw three. The servo motor two is drivingly connected to the lead screw three. Both ends of the slide table four are provided with telescopic covers one 28. One end of the telescopic cover one away from the slide table four is connected to the frame, and the telescopic cover one covers the upper part of the linear guide one. The outside of the servo motor two is covered with a protective cover one 29. The servo motor two drives the lead screw three to rotate, driving the slide table four to feed or retreat in the X direction. The settings of the telescopic cover one and the protective cover one are used to protect the internal structure therein. The Y-axis swing mechanism includes a slide table five 30, a linear guide five 31 and a swing motor 32 provided on the slide table four. The swing motor is arranged at one end of the slide table four, and a turntable 33 is provided on the output shaft of the swing motor. An oscillating rod 34 is eccentrically hinged on the turntable. One end of the oscillating rod away from the turntable is hingedly connected to the slide table five. The slide table five is slidably connected to the slide table four through the linear guide five, and the linear guide five is arranged perpendicular to the linear guide four. The honing motor is fixed on the slide table five, and the swing motor can drive the slide table five to swing back and forth in the Y direction on the slide table four.

[0038] As Figure 1 shown, this embodiment further includes a PLC controller 35 with a touch screen. The honing motor, servo motor one, servo motor two and swing motor are respectively electrically connected to the PLC controller. By inputting corresponding processing parameters through the PLC controller, automatic and efficient processing of the device can be achieved.

[0039] More specifically, as Figure 3 , Figure 8 shown, a protective cover two 36 is provided on one side of the honing motor corresponding to the swing motor. The protective cover two covers the upper parts of the linear guide five and the swing motor. One end of the slide table five away from the swing motor is connected to the slide table four through a telescopic cover two 37. The telescopic cover two covers the upper part of the linear guide five. By providing the protective cover two and the telescopic cover two, it is beneficial to protect the internal structure therein and extend the service life of the device. Both ends of the slide table one are provided with telescopic covers three 38, and the telescopic covers three cover the upper part of the linear guide one. A protective cover three 39 is provided outside the servo motor one. Telescopic covers four 40 are respectively provided on both sides of the slide table two. One end of one telescopic cover four away from the slide table two is connected to the frame, and one end of the other telescopic cover four away from the slide table two is connected to the protective cover three. A protective cover four 41 is provided on the slide table three. The protective cover four covers the upper part of the linear guide three. One end of one telescopic cover three away from the slide table one is connected to the frame, and one end of the other telescopic cover three away from the slide table one is connected to the protective cover four. Through the settings of the telescopic cover three, telescopic cover four, protective cover three and protective cover four, it is beneficial to protect the internal structure therein and extend the service life of the device.

[0040] The working principle of the present invention is that when in use, the cutting tool is first fixed on the tool fixing seat, and then the gap between the grinding wheel on the honing motor and the cutting tool is precisely adjusted through the X-direction main shaft feeding mechanism. Then, according to the required radian of the cutting tool edge, the swinging radian of the tool fixing seat is adjusted through the adjustable radian swinging mechanism. Furthermore, the honing machine main body swings back and forth along the Y direction through the Y-direction swinging mechanism, thereby realizing the efficient and precise honing processing of the cutting tool edge radian.

[0041] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A tool edge honing machine, comprising a frame, a honing machine main body and a tool fixing seat. A storage groove is provided on the frame. The honing machine main body includes a honing motor and a grinding wheel provided on the output shaft of the honing motor. The grinding wheel and the tool fixing seat are arranged corresponding to each other. It is characterized in that: The honing machine main body is adjustably connected to one end of the frame through an X-direction main shaft feeding mechanism and a Y-direction swinging mechanism, and the tool fixing seat is slidably connected to the other end of the frame through an adjustable arc swinging mechanism; The adjustable arc swinging mechanism includes a swing arm, a swing arm rotation center adjustment component and a Y-direction traction mechanism. The tool fixing seat is connected to one end of the swing arm close to the honing machine main body. A long strip-shaped through hole is provided at the end of the swing arm far from the tool fixing seat. The swing arm rotation center adjustment component includes a first rotating seat, a first linear guide rail, a first sliding table, a first lead screw and a hand wheel. The two ends of the first lead screw are respectively connected to the frame through a first bearing seat. The first lead screw and the first linear guide rail are arranged in parallel. The first sliding table is slidably connected to the first linear guide rail, and the bottom of the first sliding table is threadedly connected to the first lead screw. A hand wheel is provided at the end of the first lead screw far from the honing machine main body. The first rotating seat is rotatably connected to the first sliding table, and a central shaft and a locking component are provided at the top of the first rotating seat. The locking component is used to lock and connect the swing arm and the first rotating seat during operation. The central shaft slidably passes through the long strip-shaped through hole. The Y-direction traction mechanism includes a first servo motor, a second lead screw, a second linear guide rail, a second sliding table, a third linear guide rail, a third sliding table and a second rotating seat. The first servo motor and the second linear guide rail are both connected to the frame. The second lead screw is arranged in parallel with the second linear guide rail, and the two ends of the second lead screw are respectively connected to the frame through a second bearing seat. The output shaft of the first servo motor is in transmission connection with the second lead screw. The second sliding table is slidably connected to the second linear guide rail, and the bottom of the second sliding table is threadedly connected to the second lead screw. The third linear guide rail is arranged on the second sliding table and is perpendicular to the second linear guide rail. The third sliding table is slidably connected to the third linear guide rail. The second rotating seat is rotatably connected to the third sliding table, and the top of the second rotating seat is connected to the swing arm through a connecting rod, and the connecting rod is arranged corresponding to the tool fixing seat up and down.

2. The tool edge honing machine according to claim 1, characterized in that: The locking component includes two connecting bolts. The two connecting bolts are both arranged in the long strip-shaped through hole and symmetrically distributed on both sides of the central shaft. A pressing nut is threadedly connected to the top of the connecting bolt. The top of the pressing nut presses above the swing arm, and the lower part of the pressing nut is clamped in the long strip-shaped through hole. Guide planes are provided on both sides of the central shaft, and the guide planes are slidably connected to the corresponding side hole walls of the long strip-shaped through hole.

3. The tool edge honing machine according to claim 2, characterized in that: A limiting frame is provided on the frame. The limiting frame is connected to the frame through bolts and is arranged corresponding to the end of the swing arm far from the tool fixing seat. The limiting frame is used to limit the maximum adjustable arc of the swing arm.

4. The tool edge honing machine according to claim 2, characterized in that: The X-direction main shaft feeding mechanism includes a second servo motor, a third lead screw, a fourth linear guide rail and a fourth sliding table arranged on the top of the frame. The third lead screw is arranged in parallel with the fourth linear guide rail, and the two ends of the third lead screw are respectively connected to the frame through a third bearing seat. The fourth sliding table is slidably connected to the fourth linear guide rail, and the bottom of the fourth sliding table is threadedly connected to the third lead screw. The second servo motor is in transmission connection with the third lead screw. Expansion covers are provided at both ends of the fourth sliding table. One end of the expansion cover far from the fourth sliding table is connected to the frame, and the expansion cover covers above the first linear guide rail. A protective cover is provided outside the second servo motor.

5. The tool edge honing machine according to claim 4, characterized in that: The Y-direction swing mechanism includes a fifth slide table, a fifth linear guide rail, and a swing motor provided on the fourth slide table. The swing motor is provided at one end of the fourth slide table, and a turntable is provided on the output shaft of the swing motor. An oscillating rod is eccentrically hinged on the turntable. The end of the oscillating rod away from the turntable is hinged to the fifth slide table. The fifth slide table is slidably connected to the fourth slide table through the fifth linear guide rail, and the fifth linear guide rail is perpendicular to the fourth linear guide rail. The honing motor is fixed on the fifth slide table.

6. The tool edge honing machine according to claim 5, characterized in that: A second shield is provided on the side of the honing motor corresponding to the swing motor. The second shield covers the fifth linear guide rail and the swing motor. The end of the fifth slide table away from the swing motor is connected to the fourth slide table through a second telescopic cover. The second telescopic cover covers the fifth linear guide rail.

7. The tool edge honing machine according to claim 6, characterized in that: It also includes a PLC controller with a touch screen. The honing motor, the first servo motor, the second servo motor, and the swing motor are respectively electrically connected to the PLC controller.

8. The tool edge honing machine according to claim 7, characterized in that: Both ends of the first slide table are provided with third telescopic covers, and the third telescopic covers cover the first linear guide rail. A third shield is provided outside the first servo motor. The two sides of the second slide table are respectively provided with fourth telescopic covers. One end of the fourth telescopic cover on one side away from the second slide table is connected to the machine frame, and the other end of the fourth telescopic cover on the other side away from the second slide table is connected to the third shield. A fourth shield is provided on the third slide table. The fourth shield covers the third linear guide rail. One end of the third telescopic cover on one side away from the first slide table is connected to the machine frame, and the other end of the third telescopic cover on the other side away from the first slide table is connected to the fourth shield.

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