A graphite heat exchanger processing device

Abstract

The present invention discloses a graphite heat exchanger processing device, belonging to the field of planing and cutting, which includes a workbench; a processing bin with an open upper part for placing a heat exchange block is arranged in the workbench; an axial processing mechanism is arranged above the workbench, and the axial processing mechanism includes a movable and axially arranged broaching head; a radial broaching bin communicated with the processing bin is arranged in the workbench at a position on one side of the processing bin, and a radial processing mechanism is arranged in the radial broaching bin. The radial processing mechanism includes a radial broaching head that is perpendicular to the axial processing mechanism and does not intersect with the broaching head of the axial processing mechanism. The graphite heat exchanger processing device of the present invention can firmly clamp and accurately broach holes in the heat exchange block, and has high production efficiency.

Description

Technical Field

[0001] The present invention relates to the field of planing and cutting, and particularly to a processing device for graphite heat exchangers. Background Art

[0002] Common impregnated graphite heat exchangers include three types: shell-and-tube type, block-hole type, and plate type graphite heat exchangers. The advantages of block-hole type graphite heat exchangers include corrosion resistance, strong structure, small floor area, strong adaptability, good interchangeability of parts, no bonding structure, and relatively high heat transfer coefficient. The medium flow channels of block-hole type graphite heat exchangers are small in diameter and large in number, and extreme care is required when making the channels. However, the existing method for making channels is to first fix the graphite heat exchange block and then make the channels row by row. Since the number of channels in each row is different, the number of planing plugs needs to be adjusted every time a row is changed. To ensure accuracy, an auxiliary image recognition algorithm is required, and each planing plug needs to be controlled separately, resulting in extremely high costs. After the axial channels are made, the heat exchange block needs to be flipped to make the radial channels, and it needs to be calibrated and fixed as many times as there are rows. Moreover, the side of the cylindrical heat exchange block is arc-shaped, making it difficult to fix and align. Even a slight error will cause the channels to penetrate axially. Due to the properties of graphite, if the clamping force is insufficient during the fixing and clamping process, the heat exchange block is likely to shift and become a waste part. However, graphite is relatively soft, and even after impregnation, if the clamping force is too large, it is likely to 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 processing device for graphite heat exchangers that can perform axial and radial cutting simultaneously without repeated calibration and positioning. The technical solution of the present invention is as follows:

[0004] A processing device for graphite heat exchangers includes a workbench; a processing chamber for placing the heat exchange block with an upper opening is provided in the workbench; an axial processing mechanism is provided above the workbench, and the axial processing mechanism includes a movable planing head arranged axially.

[0005] A radial planing chamber communicating with the processing chamber is provided in the workbench at a position on one side of the processing chamber, and a radial processing mechanism is provided in the radial planing chamber. The radial processing mechanism includes a radial planing head perpendicular to the axial processing mechanism and offset from the planing head of the axial processing mechanism.

[0006] Further, the axial processing mechanism includes an axial fixing plate; first telescopic members are respectively provided at both ends below the axial fixing plate on the workbenches symmetrically arranged on both sides of the processing chamber; 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 ends of the first telescopic members.

[0007] 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;

[0008] 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.

[0009] 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.

[0010] 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;

[0011] 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.

[0012] 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;

[0013] 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.

[0014] Furthermore, air bags connected to an external air source are respectively provided in the workbenches at both sides of the processing chamber.

[0015] 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.

[0016] Further, the radial cutting heads at both ends of the radial fixing plate are radial outer cutting heads penetrating through the heat exchange block; grating sensor components are provided on the inner wall of the processing chamber on the side opposite to the radial outer cutting heads and on the radial outer cutting heads.

[0017] Further, a chip discharging chamber communicating with the processing chamber is provided below the processing chamber; a support plate that can rotate along one side is provided in the chip discharging chamber. When the support plate rotates to the horizontal position, it closely adheres to the heat exchange block above; a turntable that can be telescoped up and down and is controlledly connected to the grating sensor assembly is provided on the upper surface of the support plate.

[0018] Further, an electromagnet is fixed on the inner wall at the position where the processing chamber is connected to the chip discharging chamber; a magnetic conductor is fixed on the free end of the support plate at the position of the electromagnet; a side wall of the chip discharging chamber at the position of the magnetic conductor is open, and a door body is provided at the opening of the chip discharging chamber.

[0019] Based on the above technical solutions, the technical effects that the present invention can achieve are as follows:

[0020] 1. The present invention can simultaneously perform planing and inserting of heat exchange channels in the axial and radial directions of the heat exchange block, improve production efficiency, and avoid the frequent flipping of the posture of the heat exchange block caused by one-way cutting and the time cost and labor cost brought by debugging and accurately aligning the hole positions.

[0021] 2. The cutting heads for radial cutting and axial cutting of the present invention maintain a fixed vertical angle and can only move linearly within their own working surfaces, ensuring that the channels made in the two directions will not be offset and crossed during synchronous cutting.

[0022] 3. The present invention positions the cylindrical heat exchange block through an airbag, greatly increasing the contact area with the heat exchange block, clamping stably and powerfully, further avoiding errors, and causing little damage to the graphite heat exchange block, avoiding the damage easily caused by mechanical clamping to the relatively soft and porous graphite heat exchange block.

[0023] 4. The axial cutting head of the present invention is divided into a fixed type and a movable type that can participate in or not participate in cutting under the cooperation of a control board, adapting to the change of the number of channels in different queues on the circular surface, and replacing high-cost inputs such as algorithm control programs and precision electronic components through a simple mechanical structure.

[0024] 5. When the axial fixed cutting head moves downward for cutting, it drives the axial movable cutting head to move. When it encounters the limit of the control board, the axial movable cutting head stops moving downward and enters the position of the cutting head. After the axial fixed cutting head returns upward, it drives the axial movable cutting head again, and the two are reconnected to form an accurate change in the number of channels. The components in the structure are easy to obtain and replace.

[0025] 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.

[0026] 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

[0027] Figure 1 It is a schematic diagram of the main structure of the graphite heat exchanger processing device of the present invention;

[0028] Figure 2 It is a schematic diagram of the top view of the structure of the graphite heat exchanger processing device of the present invention;

[0029] Figure 3 It is a cross-sectional view of the graphite heat exchanger processing device of the present invention taken along line A-A';

[0030] Figure 4 It is a BB' cross-sectional view of the graphite heat exchanger processing device of the present invention;

[0031] Figure 5 It is an enlarged view of C of the graphite heat exchanger processing device of the present invention;

[0032] Figure 6 D is an enlarged view of the graphite heat exchanger processing device of the present invention;

[0033] 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

[0034] 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.

[0035] As shown in Figure 1 , Figure 2 the figure, this embodiment provides a graphite heat exchanger processing device, including a workbench 1. A processing bin 3 for placing heat exchange blocks with an opening at the upper part is provided in the workbench 1. An axial processing mechanism 21 is provided above the workbench 1, and the axial processing mechanism 21 includes a movable and axially arranged broaching head.

[0036] Inside the workbench 1 at a position on one side of the processing bin 3, a radial broaching bin 4 communicating with the processing bin 3 is provided, and a radial processing mechanism is provided in the radial broaching bin 4. The radial processing mechanism includes a radial broaching head 42 that is perpendicular to the axial processing mechanism 21 and does not intersect with the broaching head of the axial processing mechanism 21.

[0037] Preferably, the axial processing mechanism 21 includes an axial fixing plate 2. At both ends below the axial fixing plate 2, first telescopic members 25 are respectively provided on the workbench 1 symmetrically arranged on both sides of the processing bin 3; on the processing bin 3 at the lower end positions of the first telescopic members 25, first linear motion mechanisms 26 perpendicular to the axial fixing plate 2 and connected to the first telescopic members 25 are respectively provided. An axially fixed broaching head 22 with a driving end fixedly connected to the axial fixing plate 2, and a plurality of axially movable broaching heads 23 arranged in parallel on both sides of the axially fixed broaching head 22 and connected to the axially fixed broaching head 22 are provided on the axial fixing plate 2. A control plate 31 for shielding the non-broaching area of the heat exchange block is provided on the workbench 1 at a position above the processing bin 3. Inside the axial fixing plate 2 at a position above the axially movable broaching head 23, a plurality of accommodating grooves 24 respectively corresponding to the axially movable broaching heads 23 and for the axially movable broaching heads 23 to enter are provided. During the processing, preferably, the control plate 31 includes two, and is respectively symmetrically arranged on both sides of the processing bin 3; at the lower end of each control plate 31, a second linear motion mechanism parallel to the axial fixing plate 2 and connected to the control plate 31 is provided.

[0038] Preferably, as shown in Figure 5 and Figure 6 the figure, the lower part of the axial fixing plate 2 is open, and the axially fixed broaching head 22 and the axially movable broaching heads 23 are both arranged at the opening. Connecting plates 231 are rotatably provided on the driving end shells of the axially fixed broaching head 22 and the axially movable broaching heads 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 adjacent movable broaching head 23 to each connecting plate 231. The first elastic ball head 236 is one or several.

[0039] Preferably, the outer end of the connecting plate 231 is open, and a ratchet wheel 234 that can rotate counterclockwise is rotatably provided at the opening. A pawl 235 that matches the ratchet wheel 234 is provided on the connecting plate 231 at the position on one side of each ratchet wheel 234; a shifting plate 237 is fixedly provided on the driving end housing of the moving insert head 23 on the side where each pawl 235 is located; when the axial fixed insert head or the axial moving insert head where the connecting plate 231 is located returns upward, the shifting plate toggles the ratchet wheel 234 to rotate the connecting plate 231 downward. On the inner wall of the driving end housing of the axial fixed insert head or the axial moving insert head where the connecting plate 231 is located, a limiting groove 232 is provided along the rotation direction of the connecting plate 231, and a second elastic ball head 233 that extends 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 inward to form 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.

[0040] Preferably, air bags 32 communicated with an external air source are respectively provided in the workbench 1 at the positions on both sides of the processing chamber 3.

[0041] Preferably, as Figure 2 and Figure 4 shown, the driving end of the radial insert head 42 is fixed to the radial fixing plate 41. On the inner walls of the radial insert chamber 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 insert chamber 4 at the 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 insert head 42 is provided.

[0042] Preferably, as Figure 3 and Figure 4 shown, the radial insert heads 42 at both ends of the radial fixing plate 41 are radial outer end insert 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 end insert head 43 and on the radial outer end insert head 43. A chip removal chamber 33 communicated with 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 the horizontal position, it is closely attached to the heat exchange block above. A turntable 35 that can be telescoped up and down and is controlledly connected to the grating sensor assembly 45 is provided on the upper surface of the support plate 34.

[0043] Preferably, an electromagnet 342 is fixed on the inner wall at the position where the processing chamber 3 is connected to the chip removal chamber 33. A magnetic conductor 341 is fixedly provided 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.

[0044] Based on the above structure, in the graphite heat exchanger processing 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.

[0045] 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. Part of the axially movable slotting heads 23 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 231 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 237, the ratchet 234 does not rotate under the resistance of the pawl 235, and is stuck by the toggle plate 237, 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.

[0046] 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.

[0047] After all the broaching operations are 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 then the heat exchange block can be taken out. The electromagnet 342 loses its suction force on the magnetically conductive body 341, the support plate 34 flips, and after the door body 36 is opened, the debris inside can be cleaned up.

[0048] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A graphite heat exchanger processing device, characterized in that, It includes a workbench (1); a processing chamber (3) with an upward opening for placing a heat exchange block is provided in the workbench (1); an axial processing mechanism (21) is provided above the workbench (1), and the axial processing mechanism (21) includes a movable, axially arranged broaching head. A radial broaching chamber (4) communicating with the processing chamber (3) is provided in the workbench (1) at a position on one side of the processing chamber (3), and a radial processing mechanism is provided in the radial broaching chamber (4). The radial processing mechanism includes a radial broaching head (42) that is perpendicular to the axial processing mechanism (21) and is offset from the broaching head of the axial processing mechanism (21). The axial processing mechanism (21) includes an axial fixing plate (2); two ends of the lower part of the axial fixing plate (2) are respectively provided with first telescopic members (25) symmetrically arranged on the workbench (1) on both sides of the processing chamber (3); at the lower end positions of the first telescopic members (25), 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). An axially fixed broaching head (22) with a driving end fixedly connected to the axial fixing plate (2), and a plurality of axially movable broaching heads (23) arranged in parallel on both sides of the axially fixed broaching head (22) and connected to the axially fixed broaching head (22) are provided on the axial fixing plate (2); a control plate (31) for shielding the non-broaching 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 broaching heads (23) respectively and for the axially movable broaching heads (23) to enter are provided in the axial fixing plate (2) at a position above the axially movable broaching heads (23). The lower part of the axial fixing plate (2) is open, and the axially fixed broaching head (22) and the axially movable broaching heads (23) are both arranged at the opening of the axial fixing plate (2). Connecting plates (231) are rotatably provided on the driving end shells of the axially fixed broaching head (22) and the axially movable broaching heads (23); first elastic ball heads (236) are fixed below the outer ends of the connecting plates (231), and ball head grooves for the first elastic ball heads (236) to insert are provided on the axially movable broaching heads (23) adjacent to the connecting plates (231).

2. The graphite heat exchanger processing device according to claim 1, characterized in that, The control plate (31) includes two, and is symmetrically arranged on both sides of the processing chamber (3) respectively; a second linear motion mechanism parallel to the axial fixing plate (2) and connected to the control plate (31) is provided at the lower end of each control plate (31).

3. The graphite heat exchanger processing device according to claim 1, 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 axially 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.

4. The graphite heat exchanger processing 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).

5. The graphite heat exchanger processing 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).

6. The graphite heat exchanger processing device according to claim 5, characterized in that, The radial slotting heads (42) at both ends of the radial fixing plate (41) are radial outer end 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 end slotting head (43).

7. The graphite heat exchanger processing device according to claim 6, 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).

8. The graphite heat exchanger processing device according to claim 7, 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); and a door body (36) is provided at the side wall opening of the chip removal chamber (33) at the position of the magnetic conductor (341).

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