Graphite heat exchanger machining and cutting device

Abstract

The invention discloses a graphite heat exchanger machining and cutting device, and belongs to the field of planing, inserting and cutting. A processing bin which is provided with an opening in the upper part and is used for placing a heat exchange block is arranged in the workbench; an axial machining mechanism is arranged above the workbench, and the axial machining mechanism comprises a movable slotting head which is axially arranged; a radial slotting bin communicated with the machining bin is arranged at the position, on one side of the machining bin, in the workbench, a radial machining mechanism is arranged in the radial slotting bin, and the radial machining mechanism comprises a radial slotting head which is perpendicular to the axial machining mechanism and does not intersect with a slotting head of the axial machining mechanism. According to the graphite heat exchanger machining and cutting device, the heat exchange block can be stably clamped and accurately subjected to slotting and drilling, and the production efficiency is high.

Description

Technical Field

[0001] The invention relates to the field of planing and cutting, and in particular to a graphite heat exchanger processing and cutting device. Background Art

[0002] Common impregnated graphite heat exchangers include three types of graphite heat exchangers: shell and tube type, block hole type and plate type. The advantages of block hole graphite heat exchangers include corrosion resistance, strong structure, small footprint, strong adaptability, good parts interchangeability, non-bonded structure and high heat transfer coefficient. The medium flow channel diameter of the block hole graphite heat exchanger is small and the number is large, so it is necessary to be extremely careful when making the channel. However, the existing channel making method is to first fix the graphite heat exchange block, and then make the channel row by row. Since the number of channels in each row is different, the number of planing plugs needs to be adjusted for each row. To ensure accuracy, this requires auxiliary image recognition algorithms, and each planing plug needs to be controlled separately, which is extremely costly. After making the axial channel, the heat exchange block must be turned over to make the radial channel. There are as many rows as there are to calibrate and fix them. In addition, the side of the cylindrical heat exchange block is arc-shaped, which makes it difficult to fix and align. A slight error will penetrate the axial channel. Due to the properties of graphite, if the force is not enough during the fixing and clamping process, the heat exchange block will easily shift and become a waste part. However, graphite is relatively soft. Even after impregnation, if the clamping force is too large, it will easily affect the structural stability of the heat exchange block, causing damage or even collapse. Summary of the invention

[0003] In order to solve the problems existing in the prior art, the present invention proposes a graphite heat exchanger processing and cutting device that can perform axial and radial cutting simultaneously and does not require repeated calibration and positioning. The technical solution of the present invention is as follows: A graphite heat exchanger machining and cutting device comprises a workbench; a machining chamber with an upper opening for placing a heat exchange block is provided in the workbench; an axial machining mechanism is provided above the workbench, and the axial machining mechanism comprises a movable, axially arranged slotting head; A radial slotting chamber connected to the processing chamber is provided in a workbench at one side of the processing chamber, and a radial processing mechanism is provided in the radial slotting chamber. The radial processing mechanism includes a radial slotting head which is perpendicular to the axial processing mechanism and staggered with the slotting head of the axial processing mechanism.

[0004] Further, the axial processing mechanism includes an axial fixing plate; first telescopic members symmetrically arranged on workbenches on both sides of the processing chamber are respectively provided at two ends below the axial fixing plate; first linear motion mechanisms perpendicular to the axial fixing plate and connected to the first telescopic members are respectively provided on the processing chamber at the lower end of each first telescopic member; The axial fixed plate is provided with an axial fixed slotting head whose driving end is fixedly connected to the axial fixed plate, and a plurality of axial movable slotting heads are arranged in parallel on both sides of the axial fixed slotting head and connected to the axial fixed slotting head; a control panel for shielding the non-slotting area of ​​the heat exchange block is provided on the workbench above the processing chamber; A plurality of accommodating grooves corresponding to the axially movable slotting heads and for the axially movable slotting heads to enter are arranged in the axially fixed plate above the axially movable slotting heads.

[0005] Furthermore, the control plates include two, which are symmetrically arranged on both sides of the processing chamber; the lower end of each control plate is provided with a second linear motion mechanism which is parallel to the axial fixing plate and connected to the control plate.

[0006] Furthermore, the lower part of the axial fixing plate is open, and the axial fixing slotting head and the axial movable slotting head are both arranged at the opening of the axial fixing plate; A connecting plate is rotatably provided on the driving end housing of the axially fixed slotting head and each axially movable slotting head; a first elastic ball head is fixed below the outer end of each connecting plate, and a ball head groove for inserting the first elastic ball head is provided on the movable slotting head adjacent to each connecting plate.

[0007] Furthermore, the outer end of the connecting plate is open, and a ratchet that can rotate counterclockwise is rotatably provided at the opening of the connecting plate, and a pawl matching the ratchet is provided on the connecting plate at one side of each ratchet; a toggle plate is fixedly provided on the driving end housing of the movable slotting head on one side where each pawl is located; when the axially fixed slotting head or the axially movable slotting head where the connecting plate is located returns upward, the toggle plate toggle the ratchet to rotate the connecting plate downward; On the inner wall of the driving end shell of the axially fixed slotting head or the axially movable slotting head where the connecting plate is located, a limiting groove is provided along the rotation direction of the connecting plate, and a second elastic ball head extending into the limiting groove is fixed to the connecting plate at the position of each limiting groove; the upper end of the limiting groove converges inwardly into a neck-shaped end, and when the connecting plate rotates to the upper end, the second elastic ball head reaches the upper end of the limiting groove and is limited by the neck-shaped end.

[0008] Furthermore, air bags connected to an external air source are respectively provided in the workbenches at both sides of the processing chamber.

[0009] Furthermore, the driving end of the radial slotting head is fixed on the radial fixing plate; second telescopic parts connected to the radial fixing plate are respectively provided on the inner walls of the radial slotting bin at both ends of the radial fixing plate; a third linear motion mechanism connected to the second telescopic part and perpendicular to the radial slotting head is provided on the inner wall of the radial slotting bin at one end of each second telescopic part away from the radial fixing plate.

[0010] Furthermore, the radial slotting heads at both ends of the radial fixing plate are radial outer slotting heads penetrating the heat exchange block; a grating sensor assembly is provided on the inner wall of the processing chamber on the side opposite to the radial outer slotting head.

[0011] Furthermore, a chip removal bin connected to the processing bin is provided below the processing bin; a support plate that can rotate along one side is provided in the chip removal bin, and when the support plate rotates to a horizontal position, it is close to the heat exchange block above; a turntable that can be extended and retracted up and down and is controllably connected to the grating sensor assembly is provided on the upper surface of the support plate.

[0012] Furthermore, an electromagnet is fixed on the inner wall at the position where the processing bin and the chip removal bin are connected; a magnetic conductor is fixed at the position of the electromagnet and on the free end of the support plate; the side wall of the chip removal bin at the position of the magnetic conductor is open, and a door body is provided at the opening of the chip removal bin.

[0013] Based on the above technical solution, the technical effects that can be achieved by the present invention are: 1. The present invention can simultaneously realize the planing and inserting of the axial and radial heat exchange channels of the heat exchange block, thereby improving production efficiency, avoiding the frequent flipping of the heat exchange block posture caused by unidirectional slotting and cutting, and the time cost and labor cost caused by debugging and accurately aligning the hole positions.

[0014] 2. The slotting heads for radial slotting and axial slotting of the present invention maintain a fixed vertical angle and can only move linearly within their own working surfaces, ensuring that the holes made in the two directions will not be offset or crossed during synchronous cutting.

[0015] 3. The present invention uses airbags to position the cylindrical heat exchange block, which greatly increases the contact area with the heat exchange block, provides stable and powerful clamping, further avoids errors, and causes little damage to the graphite heat exchange block, thus avoiding damage to the soft and porous graphite heat exchange block that is easily caused by mechanical clamping.

[0016] 4. The axial slotting head of the present invention is divided into a fixed type and a mobile type that can participate in slotting or not with the cooperation of a control panel, and is adapted to the change of the number of holes in different queues on a circular surface. Through a simple mechanical structure, it replaces high-cost investments such as algorithm control programs and precision electronic components.

[0017] 5. The axially fixed slotting head of the present invention drives the axially movable slotting head to move when it is slotting downward. When the control panel is limited, the axially movable slotting head stops moving downward and enters the slotting head position. After the axially fixed slotting head returns to its upward position, it drives the axially movable slotting head again, and the two are reconnected to form an accurate change in the number of channels. The original parts in the structure are easy to obtain and replace.

[0018] 6. The radial outer end slotting head of the present invention can penetrate the heat exchange block. The turntable rotates the heat exchange block, and the continuity of the channel after penetration is used to perform precise positioning through the grating to ensure that the heat exchange block rotates 180°, ensuring that the channel formed by the two slotting can be connected without affecting the axial channel.

[0019] 7. The support plate of the present invention can be flipped downward to support the heat exchange block during operation, and flipped downward after the work is completed to facilitate the full discharge of debris, avoid the impact of debris accumulation on the flatness of the heat exchange block, further improve the accuracy of the slotting channel, and improve the pass rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the front view of the graphite heat exchanger processing and cutting device of the present invention; Figure 2 It is a schematic diagram of the top view of the structure of the graphite heat exchanger processing and cutting device of the present invention; Figure 3 It is a cross-sectional view taken along line A-A' of the graphite heat exchanger machining and cutting device of the present invention; Figure 4 It is a BB' cross-sectional view of the graphite heat exchanger processing and cutting device of the present invention; Figure 5 C is an enlarged view of the graphite heat exchanger processing and cutting device of the present invention; Figure 6 D is an enlarged view of the graphite heat exchanger processing and cutting device of the present invention; In the figure: 1. workbench; 2. axial fixing plate; 21. axial processing mechanism; 22. axially fixed slotting head; 23. axially movable slotting head; 231. connecting plate; 232. limiting groove; 233. second elastic ball head; 234. ratchet; 235. pawl; 236. first elastic ball head; 237. toggle plate; 24. accommodating groove; 25. first telescopic member; 26. first linear motion mechanism; 3. processing chamber; 31. control plate; 32. airbag; 33. chip removal chamber; 34. support plate; 341. magnetic conductor; 342. electromagnet; 35. turntable; 36. door body; 4. radial slotting chamber; 41. radial fixing plate; 42. radial slotting head; 43. radial outer end slotting head; 44. second telescopic member; 45. grating sensor assembly. DETAILED DESCRIPTION

[0021] The content of the present invention is further described below in conjunction with the drawings of the specification. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] like Figure 1 , Figure 2As shown, this embodiment provides a graphite heat exchanger machining and cutting device, including a workbench 1. The workbench 1 is provided with a machining chamber 3 with an upper opening for placing a heat exchange block. An axial machining mechanism 21 is provided above the workbench 1, and the axial machining mechanism 21 includes a movable, axially arranged slotting head.

[0023] A radial slotting chamber 4 connected to the processing chamber 3 is provided in the workbench 1 at one side of the processing chamber 3, and a radial processing mechanism is provided in the radial slotting chamber 4. The radial processing mechanism includes a radial slotting head 42 which is perpendicular to the axial processing mechanism 21 and does not intersect with the slotting head of the axial processing mechanism 21.

[0024] Preferably, the axial processing mechanism 21 includes an axial fixing plate 2. First telescopic members 25 symmetrically arranged on the workbench 1 on both sides of the processing chamber 3 are respectively provided at both ends below the axial fixing plate 2; first linear motion mechanisms 26 perpendicular to the axial fixing plate 2 and connected to the first telescopic members 25 are respectively provided on the processing chamber 3 at the lower end positions of each first telescopic member 25. An axial fixed slotting head 22 whose driving end is fixedly connected to the axial fixing plate 2 is provided on the axial fixing plate 2, and a plurality of axially movable slotting heads 23 arranged in parallel on both sides of the axially fixed slotting head 22 and connected to the axially fixed slotting head 22 are provided on the axial fixing plate 2. A control plate 31 for shielding the non-slotting area of ​​the heat exchange block is provided on the workbench 1 at the upper position of the processing chamber 3. A plurality of accommodating grooves 24 corresponding to each axially movable slotting head 23 and for each axially movable slotting head 23 to enter are provided in the axial fixing plate 2 at the position above the axially movable slotting head 23. Preferably, the control plates 31 include two, which are symmetrically arranged on both sides of the processing chamber 3 ; the lower end of each control plate 31 is provided with a second linear motion mechanism which is parallel to the axial fixing plate 2 and connected to the control plate 31 .

[0025] Preferably, Figure 5 and Figure 6 As shown, the lower part of the axial fixed plate 2 is open, and the axial fixed slotting head 22 and the axial movable slotting head 23 are both arranged at the opening. A connecting plate 231 is rotatably provided on the driving end housing of the axial fixed slotting head 22 and each axial movable slotting head 23; a first elastic ball head 236 is fixed below the outer end of each connecting plate 231, and a ball head groove for inserting the first elastic ball head 236 is provided on the movable slotting head 23 adjacent to each connecting plate 231. There are one or more first elastic ball heads 236.

[0026] Preferably, the outer end of the connecting plate 231 is open, and a ratchet 234 that can rotate counterclockwise is rotatably provided at the opening. A pawl 235 matching the ratchet 234 is provided on the connecting plate 231 at one side of each ratchet 234. A toggle plate 237 is fixedly provided on the driving end housing of the movable slotting head 23 at one side where each pawl 235 is located. When the axially fixed slotting head or the axially movable slotting head where the connecting plate 231 is located returns upward, the toggle plate toggles the ratchet 234 to rotate the connecting plate 231 downward. A limiting groove 232 is provided on the inner wall of the driving end housing of the axially fixed slotting head or the axially movable slotting head where the connecting plate 231 is located along the rotation direction of the connecting plate 231, and a second elastic ball head 233 extending into the limiting groove 232 is fixed on the connecting plate 231 at the position of each limiting groove 232. The upper end of the limiting groove 232 converges inwardly into a neck-shaped end. When the connecting plate 231 rotates to the upper end, the second elastic ball head 233 reaches the upper end of the limiting groove 232 and is limited by the neck-shaped end.

[0027] Preferably, air bags 32 connected to an external air source are respectively provided in the workbench 1 at both sides of the processing chamber 3 .

[0028] Preferably, Figure 2 and Figure 4 As shown, the driving end of the radial slotting head 42 is fixed on the radial fixing plate 41. On the inner wall of the radial slotting bin 4 at both ends of the radial fixing plate 41, second telescopic members 44 connected to the radial fixing plate 41 are respectively provided; on the inner wall of the radial slotting bin 4 at one end of each second telescopic member 44 away from the radial fixing plate 41, a third linear motion mechanism connected to the second telescopic member 44 and perpendicular to the radial slotting head 42 is provided.

[0029] Preferably, Figure 3 and Figure 4 As shown, the radial slotting heads 42 at both ends of the radial fixing plate 41 are radial outer slotting heads 43 that penetrate the heat exchange block. A grating sensor assembly 45 is provided on the inner wall of the processing chamber 3 on the side opposite to the radial outer slotting head 43 and on the radial outer slotting head 43. A chip removal chamber 33 connected to the processing chamber 3 is provided below the processing chamber 3. A support plate 34 that can rotate along one side is provided in the chip removal chamber 33. When the support plate 34 rotates to a horizontal position, it is closely attached to the heat exchange block above. A rotating disk 35 that can be extended and retracted up and down and is controllably connected to the grating sensor assembly 45 is provided on the upper surface of the support plate 34.

[0030] Preferably, an electromagnet 342 is fixed on the inner wall at the position where the processing chamber 3 and the chip removal chamber 33 meet. A magnetic conductor 341 is fixed at the position of the electromagnet 342 and the free end of the support plate 34. The side wall of the chip removal chamber 33 at the position of the magnetic conductor 341 is open, and a door body 36 is provided at the opening.

[0031] Based on the above structure, in the graphite heat exchanger processing and cutting device of the present invention, when cutting the channel of the heat exchange block, the electromagnet 342 is energized to attract the support plate 34 to reverse upward to a horizontal position, and the heat exchange block is placed in the processing chamber 3, on the support plate 34, the airbag 32 is inflated to squeeze and fix the heat exchange block.

[0032] The control plates 31 on both sides move toward the heat exchange block and stop after covering the peripheral area that is not slotted. Then the first linear motion mechanism 26 drives the first telescopic member 25 to move toward the heat exchange block and stops after the axial fixed slotting head 22 on the axial fixed plate 2 is aligned with the position where the first row of holes need to be punched; then the first telescopic member 25 contracts, the axial fixed plate 2 and the fixed axial fixed slotting head 22 move downward, and at the same time, the axial movable slotting head 23 moves downward together under the action of the connecting plate 231. The axially movable slotting heads 23 partially located in the non-slotting area are blocked by the control plate 31, while the remaining slotting heads continue to move downward with the axial fixed plate 2, and the blocked axially movable slotting heads produce relative movement, enter the receiving groove 24, and maintain a stable position; at the same time, the displacement difference causes the connecting plate 231 to rotate upward, the first elastic ball head 236 leaves the ball head groove, and the connecting plate 31 is dragged along the axially movable slotting head 23 to continue to rotate upward in the continuously increasing displacement, until the second elastic ball head 233 enters the neck end convergence area along the limit groove 232. After a row of slotting is completed, the first telescopic member 25 extends outward, and after the resistance of the control plate 31 is weakened, the axially movable slotting head 23 in the receiving groove 24 approaches the remaining slotting heads under the action of gravity, and after the ratchet 234 touches the toggle plate 27, the ratchet 234 does not rotate under the resistance of the pawl 235, and is stuck by the toggle plate 27, thereby driving the connecting plate 231 to move downward and return to its position. The axial fixed plate 2 continues to move to the next row of channels, repeating the above process to achieve selective slotting of different numbers of channels. The structural strength of the graphite heat exchange block is relatively low, and the friction between the first elastic ball head 236 and the ball head groove is greater than the slotting resistance, which can ensure the stable connection between the axial fixed slotting head 22 and the axial movable slotting head 23.

[0033] At the same time, the second telescopic member 44 moves toward the first row of radial channel positions driven by the third linear motion mechanism until the radial slotting head 42 is aligned with the position to be slotted; the second telescopic member 44 contracts, and the radial fixing plate 41 drives the fixed slotting head to move toward the heat exchange block and perform slotting. The radial outer end slotting head 43 penetrates the heat exchange block, and the remaining radial slotting heads 42 slot more than half of the heat exchange block before retreating into the radial slotting chamber 4. Then the turntable 35 lifts the heat exchange block upward and rotates. During the rotation, the grating sensor assembly 45 detects the through-channel, indicating that the heat exchange block has accurately rotated 180°. The turntable 35 stops rotating and contracts, and then the radial fixing plate 41 drives the fixed slotting head to continue slotting through. Through slotting and penetration on both sides, the problem of the middle radial slotting head being too long and prone to offset during one-time slotting is solved.

[0034] After all the slotting is completed, the first telescopic member 25 and the third telescopic member 44 drive the axial fixing plate 2 and the radial fixing plate 41 to return to their original positions, and the heat exchange block can be removed. The electromagnet 342 loses its attraction to the magnetizer 341, the support plate 34 turns over, and the door body 36 is opened to clean the internal debris.

[0035] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A graphite heat exchanger processing and cutting device, characterized in that: The invention comprises a workbench (1); the workbench (1) is provided with a processing chamber (3) with an upper opening for placing a heat exchange block; an axial processing mechanism (21) is provided above the workbench (1), and the axial processing mechanism (21) comprises a movable, axially arranged slotting head; A radial slotting chamber (4) connected to the processing chamber (3) is provided in the workbench (1) at one side of the processing chamber (3), and a radial processing mechanism is provided in the radial slotting chamber (4), the radial processing mechanism comprising a radial slotting head (42) which is perpendicular to the axial processing mechanism (21) and staggered with the slotting head of the axial processing mechanism (21).

2. The graphite heat exchanger processing and cutting device according to claim 1, characterized in that: The axial processing mechanism (21) comprises an axial fixing plate (2); first telescopic members (25) are respectively provided at two ends below the axial fixing plate (2) and are symmetrically arranged on the workbench (1) on both sides of the processing chamber (3); and first linear motion mechanisms (26) are respectively provided on the processing chamber (3) at the lower end of each first telescopic member (25) and are perpendicular to the axial fixing plate (2) and connected to the first telescopic member (25); The axial fixing plate (2) is provided with an axial fixing slotting head (22) whose driving end is fixedly connected to the axial fixing plate (2), and a plurality of axial movable slotting heads (23) are arranged in parallel on both sides of the axial fixing slotting head (22) and connected to the axial fixing slotting head (22); a control plate (31) for shielding a non-slotting area of ​​the heat exchange block is provided on the workbench (1) at a position above the processing chamber (3); A plurality of accommodating grooves (24) corresponding to the axially movable slotting heads (23) and for the axially movable slotting heads (23) to enter are provided in the axially fixed plate (2) above the axially movable slotting heads (23).

3. The graphite heat exchanger processing and cutting device according to claim 2, characterized in that: The control plates (31) include two, which are symmetrically arranged on both sides of the processing chamber (3); a second linear motion mechanism is provided at the lower end of each control plate (31), which is parallel to the axial fixing plate (2) and connected to the control plate (31).

4. The graphite heat exchanger processing and cutting device according to claim 2, characterized in that: The lower portion of the axial fixed plate (2) is open, and the axial fixed slotting head (22) and the axial movable slotting head (23) are both arranged at the opening of the fixed plate (2); A connecting plate (231) is rotatably provided on the driving end housings of the axially fixed slotting head (22) and each axially movable slotting head (23); a first elastic ball head (236) is fixed below the outer end of each connecting plate (231), and a ball head groove for inserting the first elastic ball head (236) is provided on the movable slotting head (23) adjacent to each connecting plate (231).

5. The graphite heat exchanger processing and cutting device according to claim 4, characterized in that: The outer end of the connecting plate (231) is open, and a ratchet (234) that can rotate counterclockwise is rotatably provided at the opening of the connecting plate (231), and a ratchet (235) that matches the ratchet (234) is provided on the connecting plate (231) at one side of each ratchet (234); a toggle plate (237) is fixedly provided on the driving end housing of the movable slotting head (23) at one side where each ratchet (235) is located; when the axially fixed slotting head or the axially movable slotting head where the connecting plate (231) is located returns upward, the toggle plate toggle the ratchet (234) to rotate the connecting plate (231) downward; On the inner wall of the driving end housing of the axially fixed slotting head or the axially movable slotting head where the connecting plate (231) is located, a limiting groove (232) is provided along the rotation direction of the connecting plate (231); a second elastic ball head (233) extending into the limiting groove (232) is fixed on the connecting plate (231) at the position of each limiting groove (232); the upper end of the limiting groove (232) converges inwardly into a neck-shaped end; when the connecting plate (231) rotates to the upper end, the second elastic ball head (233) reaches the upper end of the limiting groove (232) and is limited by the neck-shaped end.

6. The graphite heat exchanger processing and cutting device according to claim 1, characterized in that: Air bags (32) connected to an external air source are respectively provided in the workbenches (1) at the two sides of the processing chamber (3).

7. The graphite heat exchanger processing and cutting device according to claim 1, characterized in that: The driving end of the radial slotting head (42) is fixed on the radial fixing plate (41); second telescopic members (44) connected to the radial fixing plate (41) are respectively provided on the inner wall of the radial slotting chamber (4) at both ends of the radial fixing plate (41); and a third linear motion mechanism connected to the second telescopic member (44) and perpendicular to the radial slotting head (42) is provided on the inner wall of the radial slotting chamber (4) at one end of each second telescopic member (44) away from the radial fixing plate (41).

8. The graphite heat exchanger processing and cutting device according to claim 7, characterized in that: The radial slotting heads (42) at both ends of the radial fixing plate (41) are radial outer slotting heads (43) that penetrate the heat exchange block; a grating sensor assembly (45) is provided on the inner wall of the processing chamber (3) on the side opposite to the radial outer slotting head (43) and on the radial outer slotting head (43).

9. The graphite heat exchanger processing and cutting device according to claim 8, characterized in that: A chip removal bin (33) in communication with the processing bin (3) is provided below the processing bin (3); a support plate (34) rotatable along one side is provided in the chip removal bin (33); when the support plate (34) is rotated to a horizontal position, it is in close contact with the heat exchange block above; a rotating disk (35) is provided on the upper surface of the support plate (34) and is retractable and controllably connected to the grating sensor assembly (45).

10. The graphite heat exchanger processing and cutting device according to claim 9, characterized in that: An electromagnet (342) is fixed on the inner wall at the position where the processing chamber (3) and the chip removal chamber (33) meet; a magnetic conductor (341) is fixed on the free end of the support plate (34) at the position of the electromagnet (342); the side wall of the chip removal chamber (33) at the position of the magnetic conductor (341) is open, and a door body (36) is provided at the opening of the chip removal chamber (33).

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