Plate milling machine

Abstract

The utility model discloses a plate milling machine which comprises a first base body and a second base body, the second base body is arranged on the first base body in a drawable manner; the milling cutter assembly comprises a plurality of milling cutter units which are connected to the second base body and are arranged side by side; and the dustproof cover is assembled and fixed on the second base body and is arranged below the plurality of milling cutter units, and the dustproof cover is provided with a penetrating part used for penetrating through the milling cutter units. According to the novel plate milling machine structure provided by the utility model, the milling cutter assembly can be conveniently maintained or overhauled.

Description

Technical Field

[0001] This utility model belongs to the field of wood processing and production technology, specifically, it relates to an improvement in the structure of a milling machine. Background Technology

[0002] Existing milling machine structures, such as the artificial board milling sander structure disclosed in patent publication number CN 202846307 U, can be used to mill boards. Its structure mainly includes a base, a frame fixed on the base, a worktable and a board conveying mechanism and its motor drive system, a dust collection mechanism installed on the frame, multiple vertical milling heads arranged horizontally on the left and right, and their height adjustment mechanism. During assembly, the multiple vertical milling heads are individually fixed to the frame. Due to space limitations, when the vertical milling heads need to be maintained or repaired, they need to be disassembled for repair, and the repair operation remains unchanged. Utility Model Content

[0003] This utility model addresses the aforementioned technical problems existing in existing milling machines by proposing a novel milling machine structure that facilitates the maintenance or repair of the milling cutter assembly.

[0004] To achieve the above-mentioned utility model / design objectives, the present utility model adopts the following technical solution:

[0005] A milling machine, comprising:

[0006] First matrix;

[0007] The second substrate is removably disposed on the first substrate;

[0008] The milling cutter assembly includes:

[0009] Multiple milling cutter units are connected to the second base, and the multiple milling cutter units are arranged side by side;

[0010] A dust cover is mounted and fixed on the second base and disposed below the plurality of milling cutter units. The dust cover is provided with a through-hole for the milling cutter units to pass through.

[0011] Compared with the prior art, the advantages and positive effects of this utility model are:

[0012] In this utility model, the milling cutter assembly is structurally designed such that the dust cover and multiple milling cutter units are fixedly connected to a second base to form a whole. The second base is retractable and is mounted on the first base. When it is necessary to perform maintenance or other operations on the multiple milling cutter units, the second base can be pulled relative to the first base to move the multiple milling cutter units mounted on it away from the working position above the conveyor line and to the outer area of ​​the frame. This allows for convenient maintenance or repair of the milling cutter units from the bottom position, making maintenance and repair more convenient.

[0013] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of the milling cutter assembly of the milling machine proposed in this utility model, which is in cooperation with the first base and the second base;

[0016] Figure 2 for Figure 1 Enlarged view of a portion at point A;

[0017] Figure 3 for Figure 1 A magnified view of section B;

[0018] Figure 4 This is a side view of one embodiment of the milling machine proposed in this utility model;

[0019] Figure 5 This is a schematic diagram of the milling cutter assembly of one embodiment of the milling machine proposed in this utility model;

[0020] Figure 6 This is a schematic diagram of the rolling fit between the second connecting base and the first base in one embodiment of the milling machine proposed in this utility model;

[0021] Figure 7 This is a schematic diagram of the milling cutter component structure of one embodiment of the milling machine proposed in this utility model;

[0022] Figure 8 yes Figure 7 A magnified view of a portion of point C.

[0023] In the figure, 100 is the first base; 110 is the first supporting base; 120 is the first connecting base; 130 is the rolling component; 200 is the second base; 210 is the second supporting base; 220 is the second connecting base; 221 is the rolling track; 300 is the milling cutter unit; 310 is the milling cutter component; 311 is the protective shell; 312 is the spindle component; 320 is the connecting assembly; 330 is the first rotary bearing; 340 is the first rotating component; and 341 is the second ring. 342. Second annular recess; 350. First seal; 351. First annular recess; 352. First annular protrusion; 360. Second rotating bearing; 370. Second seal; 380. Second rotating component; 400. Dust cover; 410. Through part; 500. Connecting component; 510. First component; 511. Left and right adjustment elongated hole; 520. Second component; 521. Height adjustment elongated hole; 522. Front and rear adjustment elongated hole. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. In the description of the embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0027] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0028] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0029] In some embodiments of this application, a milling machine is proposed, which can be used to perform milling operations on sheet metal. The milling machine includes a frame on which a conveyor line is provided for conveying the sheet metal to be milled.

[0030] The first base 100 is fixedly assembled on the frame and horizontally spans above the conveyor line.

[0031] The second substrate 200 is removably disposed on the first substrate 100.

[0032] The second base 200 is arranged laterally above the conveyor line.

[0033] The milling cutter assembly includes:

[0034] Multiple milling cutter units 300 are connected to the second base 200, and the multiple milling cutter units 300 are arranged side by side.

[0035] Multiple milling cutter units 300 are arranged side by side on the second base 200 to mill the sheet metal conveyed from the conveyor line along the entire width direction.

[0036] A dust cover 400 is mounted and fixed on the second base 200 and disposed below the plurality of milling cutter units 300. A through part 410 for passing through the milling cutter unit 300 is provided on the dust cover 400. The through part 410 is a through hole on the dust cover 400 for passing through the milling cutter unit 300 so that the milling cutter unit 300 can perform operations.

[0037] The dust cover 400 is a cover structure, and its bottom forms a working space for the milling cutter unit 300. After passing through the through part 410, the milling cutter unit 300 enters the working space to mill the plates on the conveyor line. At this time, the dust generated by milling is all in the working space. The dust cover 400 protects the dust and makes the dust overflow upward as little as possible, thus achieving the dust prevention effect.

[0038] In this embodiment, the milling cutter assembly is structurally designed such that the dust cover 400 and multiple milling cutter units 300 are fixedly connected to the second base 200 to form a whole. The second base 200 is retractable and is mounted on the first base 100. When maintenance or other operations are required on the multiple milling cutter units 300, the second base 200 can be pulled relative to the first base 100 to move the multiple milling cutter units 300 and the dust cover 400 mounted on it away from the working position above the conveyor line and to the outer area of ​​the frame. This allows for convenient maintenance or repair of the milling cutter units 300 from the bottom position, making maintenance and repair more convenient.

[0039] After inspection or maintenance is completed, the second base 200 can be pushed, and the multiple milling cutter units 300 and dust cover 400 can be reset through the second base 200. When the milling machine is working normally, the dust cover 400 and the multiple milling cutter units 300 are supported and fixed by the second base 200.

[0040] In some embodiments of this application, each milling cutter unit 300 includes two milling cutter components 310, and each milling cutter component 310 is connected to the second base 200 via a set of connecting components 320.

[0041] The connecting assembly 320 is composed of multiple connecting plates or multiple connecting seats connected to each other.

[0042] In some embodiments of this application, a rolling assembly is provided between the second base 200 and the first base 100. By providing the rolling assembly between the second base 200 and the first base 100, the sliding and pulling of the second base 200 relative to the first base 100 can be guided and the friction of the sliding and pulling of the second base 200 can be reduced, so that the second base 200 can be stably and quickly pulled into place, making it easier to pull the second base 200.

[0043] In some embodiments of this application, the first substrate 100 includes a first support substrate 110 and a first connecting substrate 120 connected to the first support substrate 110.

[0044] The first support base 110 is the first support beam, and the first connecting base 120 is the first connecting plate connected to the front side of the first support beam.

[0045] The second substrate 200 includes a second support substrate 210 and a second connecting substrate 220 connected to the second support substrate 210.

[0046] The second support base 210 is the second support plate, and the second connecting base 220 is the second connecting plate.

[0047] The second support base 210 and the second connecting base 220 are arranged in a front-to-back manner and are connected to each other.

[0048] The second support base 210 is mainly used for assembling the milling cutter assembly.

[0049] Rolling components 130 are provided at both the upper and lower ends of the first connecting base 120. The second connecting base 220 is arranged between the rolling components 130 at the upper and lower ends. Rolling tracks 221 that cooperate with the rolling components 130 are provided at both the upper and lower ends of the second connecting base 220.

[0050] The first connecting base 120 and the second connecting base 220 are adjacent to each other, and the height of the first connecting base 120 is greater than the height of the second connecting base 220.

[0051] The rolling component structure can be conveniently arranged by setting the first connecting base 120 and the second connecting base 220.

[0052] The rolling component 130 is a roller, which is rotatably mounted on the first connecting base 120.

[0053] In the specific arrangement, the rollers are set into two groups, with multiple rollers in each group. The two groups of rollers are respectively arranged at the upper and lower ends of the first connecting base 120.

[0054] The second connecting base 220 is arranged between the two sets of rollers, and rolling tracks 221 are respectively provided on its upper and lower sides.

[0055] By positioning the second connecting base 220 between the two sets of rollers on the first connecting base 120 and engaging with them in a rolling manner, not only can the stability of the second connecting base 220 relative to the first connecting base 120 be ensured by having rollers at both the upper and lower ends of the second connecting base 220, but the two sets of rollers can also engage with the rolling track 221 on the second connecting base 220 to limit the second connecting base 220, preventing it from coming off the first connecting base 120 when it is being pulled out relative to the first connecting base 120.

[0056] When the second connecting base 220 is pulled, it will cause the second supporting base 210 connected to it and the milling cutter assembly mounted on the second supporting base 210 to move relative to the first base 100, so that the second connecting base 220, the second supporting base 210 and the milling cutter assembly above it are all slidably pulled to the outer area of ​​the frame.

[0057] In some embodiments of this application, at least one end of the dust cover 400 is provided with a connecting member 500, which connects the dust cover 400 to the second base 200.

[0058] The connecting member 500 is a connecting plate assembly used to fix the dust cover 400 to the second base 200, so that when the second base 200 is pulled, the milling cutter unit 300 and the dust cover 400 can be simultaneously pulled to the outer area of ​​the frame for maintenance without removing the dust cover 400.

[0059] In some embodiments of this application, the connecting member 500 includes:

[0060] The first component 510 is bent and connected at one end to the second base 200. The position of the first component 510 relative to the second base 200 in the left and right directions is adjustable.

[0061] The first component 510 is a first bent plate, including a first bent section and a second bent section. The first bent section is parallel to the second base 200 and is connected and fixed to the second base 200.

[0062] A left-right adjustment elongated hole 511 is provided on the first bending section, and a screw hole is provided on the second base 200. When fixing, the locking screw passes through the left-right adjustment elongated hole 511 and is locked in the screw hole to press and fix the first bending section and the second base 200.

[0063] When it is necessary to adjust the left and right position of the first component 510 relative to the second base 200, the locking screw can be loosened, and then the position can be changed by moving along the locking screw through the left and right adjustment elongated hole 511 above it to achieve the adjustment of the left and right position. After the adjustment is in place, the locking screw can be tightened.

[0064] The second component 520 is connected to the end of the dust cover 400 and is connected to the first component 510. The position of the second component 520 relative to the dust cover 400 in the front-back direction is adjustable, and the height of the second component 520 relative to the first component 510 is adjustable.

[0065] The second component 520 is a second vertical plate, which is connected to one end of the dust cover 400. Its bottom is attached to the end face of the dust cover 400, and its top is attached to the second bent section of the first component 510.

[0066] The second component 520 has a height-adjusting elongated hole 521 at its top position, and the first component 510 has a threaded hole.

[0067] The locking screw passes through the height adjustment elongated hole 521 and locks into the threaded hole in the first component 510, thereby pressing and fixing the second component 520 and the first component 510 together.

[0068] When height adjustment is required, loosen the locking screw, and then move the second component 520 up and down along the locking screw through the height adjustment elongated hole 521 on the second component 520 to adjust the position of the second component 520 relative to the first component 510 in the height direction. After adjustment, tighten the locking screw.

[0069] The second component 520 has a front-to-back adjustment elongated hole 522 at its bottom position, and the dust cover 400 has a threaded hole.

[0070] When fixed, the locking screw passes through the front and rear adjustment elongated hole 522 and locks into the threaded hole of the dust cover 400 to fix the second component 520 and the dust cover 400.

[0071] When front-to-back adjustment is required, loosen the locking screw, move along the locking screw through the front-to-back adjustment elongated hole 522 on the second component 520 to adjust the front-to-back position, and tighten the locking screw after adjustment.

[0072] Since the first component 510 and the second component 520 are connected, and the second component 520 is connected to the dust cover 400, when the first component 510 is adjusted in the left and right direction relative to the second base 200, the left and right position adjustment of the dust cover 400 connected to it is realized.

[0073] The second component 520 is connected to the dust cover 400. Adjusting the height of the second component 520 relative to the first component 510 can adjust the height of the dust cover 400.

[0074] Meanwhile, by adjusting the front-to-back position of the second component 520 relative to the dust cover 400, the front-to-back position of the dust cover 400 can be adjusted.

[0075] The above-mentioned adjustment structure can be used to adjust the position of the dust cover 400 in the left-right, front-back and height directions, so that the through part 410 on the dust cover 400 can correspond exactly to the position of the milling cutter unit 300, so that the milling cutter unit 300 can pass through the dust cover 400.

[0076] In some embodiments of this application, the milling cutter component 310 includes a spindle assembly and a milling cutter component mounted below the spindle assembly. The spindle assembly includes a protective shell 311, with a first opening and a second opening formed at both ends of the protective shell 311.

[0077] The protective housing 311 has a space inside, which can be used to accommodate part of the spindle component 312 and the bearing assembly.

[0078] By embedding the bearing assembly inside the protective housing 311, dust protection of the bearing assembly can be achieved, thus preventing most of the dust from entering the bearing assembly.

[0079] The first opening and the second opening are respectively formed on the protective shell 311, and the two ends of the protective shell 311 can be connected through the first opening and the second opening.

[0080] The spindle component 312 is disposed inside the protective housing 311 and extends from the first opening and the second opening at both ends.

[0081] In the configuration, the first opening is located above the protective housing 311, the second opening is located below the protective housing 311, the spindle component 312 is partially placed inside the protective housing 311, and the upper and lower portions extend out of the protective housing 311 respectively.

[0082] The milling cutter assembly is connected to the section of the spindle assembly 312 that extends from the second opening.

[0083] The first rotary bearing 330 is disposed inside the protective housing 311 and near the first opening.

[0084] The first rotary bearing 330 is rotatably connected to the main shaft component 312, and is correspondingly connected to the upper part of the main shaft component 312 near the first opening.

[0085] A limiting stage is provided on the protective shell 311 to limit one end face of the first rotary bearing 330.

[0086] A limiting ring is fitted on the spindle component 312 and inserted and fixed to the protective shell 311, which is used to limit the end face of the other end of the first rotating bearing 330.

[0087] The first sealing element 350 is fixedly connected to the protective shell 311 and seals the first opening;

[0088] The first rotating member 340 is connected to the main shaft component 312 and forms a first rotating sealing structure with the first sealing member 350.

[0089] The first rotating component 340 is sleeved onto the spindle component 312 and is interference-fitted with the spindle component 312. A mounting hole is provided on the side of the first rotating component 340, and a locking screw passes through the mounting hole and locks itself in the spindle component 312 to securely lock and fix the first rotating component 340 and the spindle component 312.

[0090] The first seal 350 can seal the first opening by blocking the first opening above the protective shell 311. Since the first seal 350 also needs to pass through the spindle component 312, and a first through part 410 for passing through the spindle component 312 is provided in the middle, the first through part 410 is the first through hole, so the periphery of the first through hole also needs to be sealed.

[0091] The first rotating member 340 and the first sealing member 350 cooperate to form a first rotating sealing structure located around the first through portion 410, which is used to seal the first through portion 410.

[0092] In a specific configuration, the first rotating component 340 is mounted and fixed on the main shaft component 312, and is positioned opposite to the first sealing component 350. There is a small gap between the opposite end faces of the two components to avoid direct contact between the first rotating component 340 and the first sealing component 350, which would cause hard rotational wear.

[0093] On the one hand, since the first rotating component 340 is connected to the main shaft component 312 and the first sealing component 350 is connected to the protective shell 311, the two have a first rotational sealing structure, which can ensure that the main shaft component 312 can rotate normally relative to the protective shell 311 equipped with the first sealing component 350 through the first rotating component 340.

[0094] On the other hand, the first rotating seal structure can also seal the circumference of the first through part 410 to prevent dust from entering the interior of the first rotating bearing 330 through the first through part 410, affecting the normal operation and service life of the first rotating bearing 330, and ensuring the normal and stable rotation of the entire spindle assembly 312.

[0095] The second rotary bearing 360 is disposed inside the protective housing 311 and near the second opening.

[0096] The second rotary bearing 360 is mounted on the lower part of the spindle assembly 312.

[0097] A third limiting member is provided on the spindle assembly 312 to limit one end face of the second rotating bearing 360;

[0098] The second sealing element 370 is fixedly connected to the protective shell 311 and seals the second opening. A second through part 410 is provided on the second sealing element 370.

[0099] The second seal 370 limits the other end face of the second rotary bearing 360.

[0100] The second through portion 410 is a second through hole for passing through the spindle component 312.

[0101] The second seal 370 can seal the second opening at the bottom of the protective shell 311. Since the second seal 370 also needs to pass through the main shaft component 312, and there is a second through part 410 in the middle for passing through the main shaft component 312, the second through part 410 also needs to be sealed around its periphery.

[0102] The second rotating component 380 is connected to the main shaft component 312 and forms a second rotating sealing structure with the second sealing component 370.

[0103] The second rotating component 380 can be interference-fitted onto the spindle assembly 312, and its side is locked and fixed to the spindle assembly 312 by locking screws.

[0104] After assembly, there is a small gap between the opposing end faces of the second rotating member 380 and the second sealing member 370.

[0105] This is to avoid hard contact and wear between the second rotating member 380 and the second seal member 370 when they rotate relative to each other.

[0106] The second rotating member 380 and the second sealing member 370 are respectively formed with a second rotating sealing structure around the second through portion 410.

[0107] By forming a second rotational sealing structure between the two, when the spindle component 312 rotates relative to the protective housing 311, the second rotating member 380 rotates relative to the second sealing member 370 to ensure that the spindle component 312 can perform normal rotational operations.

[0108] Furthermore, due to the second rotational sealing structure between the second rotating member 380 and the second sealing member 370, dust during milling operations by the milling machine will not enter the interior of the second rotating bearing 360 through the second through part 410, thus ensuring the normal operation of the second rotating bearing 360.

[0109] In some embodiments of this application, two first annular recesses 351 are formed on the first seal 350 and a first annular protrusion 352 is formed between the two first annular recesses 351.

[0110] The first annular recess 351 is a first annular recessed groove, and the first annular protrusion 352 is formed between the two first annular recessed grooves.

[0111] Two second annular protrusions 341 and a second annular recess 342 formed between the two second annular protrusions 341 are formed on the first rotating member 340.

[0112] The second annular recess 342 is a second annular recessed groove, and the two second annular protrusions 341 are correspondingly formed with a second annular recessed groove.

[0113] Among them, two first annular recesses 351 and two second annular protrusions 341 are inserted into each other, and the first annular protrusions 352 and the second annular recesses 342 are inserted into each other.

[0114] When in use, the first annular recessed groove on the first sealing member 350 and the second annular protrusion 341 on the first rotating member 340 are inserted into each other, while the first annular protrusion 352 is inserted into the second annular recessed groove. Through this alternating insertion and engagement of the recessed and protruding parts, the transmission path of dust can be effectively blocked, preventing dust from entering the first through-part 410 through the gap, thus achieving a better sealing and dustproof effect.

[0115] The second rotary seal structure is the same as the first rotary seal structure, and will not be described in detail here.

[0116] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by this utility model.

Claims

1. A board milling machine characterized by, The milling machine comprises: a first base; a second base, which is arranged on the first base and is capable of being pulled out; a milling cutter assembly, which comprises: a plurality of milling cutter units, which are connected to the second base and are arranged side by side; a dust cover, which is fixed to the second base and is arranged below the plurality of milling cutter units, and a passing portion for passing through the milling cutter units is arranged on the dust cover.

2. The board milling machine of claim 1, wherein, Each milling cutter unit comprises two milling cutter members, and each milling cutter member is connected to the second base by a set of connecting assemblies.

3. The board milling machine of claim 1, wherein, Rolling assemblies are arranged between the second base and the first base.

4. The board milling machine of claim 3, wherein, The first base comprises a first supporting base and a first connecting base connected to the first supporting base. The second base comprises a second supporting base and a second connecting base connected to the second supporting base. Rolling parts are arranged at the upper end and the lower end of the first connecting base, and the second connecting base is arranged between the rolling parts at the upper end and the lower end, and rolling tracks matched with the rolling parts are arranged at the upper end and the lower end of the second connecting base.

5. The board milling machine of claim 1, wherein, At least one end of the dust cover is provided with a connecting member, and the connecting member connects the dust cover to the second base.

6. The board milling machine of claim 5, wherein, The connecting member comprises: a first member, which is arranged in a bent manner, one end of which is connected to the second base, and the first member is adjustable in position in the left-right direction relative to the second base; a second member, which is connected to the dust cover at the end position and is connected to the first member, and the second member is adjustable in position in the front-rear direction relative to the dust cover and is adjustable in height relative to the first member.

7. The board milling machine of claim 2, wherein, The milling cutter member comprises a main shaft assembly and a milling cutter part arranged below the main shaft assembly, and the main shaft assembly comprises: a protective shell, first and second opening parts are formed at two ends of the protective shell; a main shaft part, which is arranged in the protective shell and extends out of the first and second opening parts at two ends; a first rotating bearing, which is arranged in the protective shell and is close to the first opening part; a first sealing member, which is fixedly connected to the protective shell and blocks the first opening part, and a first passing portion for passing through the main shaft part is arranged above the first sealing member; a first rotating member, which is connected to the main shaft part and forms a first rotating sealing structure with the first sealing member around the first passing portion; a second rotating bearing, which is arranged in the protective shell and is close to the second opening part; a second sealing member, which is fixedly connected to the protective shell and blocks the second opening part, and a second passing portion for passing through the main shaft part is formed above the second sealing member; a second rotating member, which is connected to the main shaft part and forms a second rotating sealing structure with the second sealing member around the second passing portion.

8. The milling machine according to claim 7, wherein the first rotating sealing structure comprises: two first annular recesses formed on the first sealing member and a first annular protrusion formed between the two first annular recesses; two second annular protrusions formed on the first rotating member and a second annular recess formed between the two second annular protrusions. Two first annular recesses and two second annular protrusions are in a plug-in fit, and the first annular protrusion and the second annular recess are in a plug-in fit.

9. The board milling machine of claim 1, wherein, The two milling cutter members of each milling cutter unit are arranged staggeredly.

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