Integrated forming production line for inner ring and outer ring of bearing

Abstract

The invention discloses an integral forming production line for inner and outer rings of bearings, and relates to the technical field of bearing machining equipment.The integral forming production line comprises a machining table, a first motor is fixedly mounted at the bottom of the machining table, a rotating shaft is connected to the output end of the first motor, and a bearing seat is fixedly connected to the top of the rotating shaft; a through movable groove is formed in the top of the bearing seat, and inner ring fixing mechanisms are fixedly installed in the bearing seat and on the two sides of the bearing seat and penetrate through the movable groove to extend to the position above the bearing seat. The device can effectively solve the problems that in the prior art, a grinding device in an integrated forming production line of the inner and outer rings of the bearing cannot conveniently and rapidly fix the inner and outer rings of the bearing, the grinding device is not suitable for machining bearings of various different sizes conveniently, and meanwhile during grinding, the machining efficiency is high. And a large amount of fine dust generated by polishing is easy to drift into nearby air, so that the health of nearby workers is harmed.

Description

Technical Field

[0001] The invention relates to the technical field of bearing processing equipment, in particular to an integrated molding production line for inner and outer rings of bearings. Background Art

[0002] Bearings are an important mechanical component, and their main function is to support rotating shafts or other rotating parts in mechanical devices, reduce friction, and facilitate rotation and positioning. Bearings can withstand radial loads, axial loads, or a combination of the two, while maintaining rotation accuracy. The inner and outer rings of bearings refer to the outer and inner rings of bearings. The integrated processing of the inner and outer rings of bearings is to process the inner and outer rings of bearings together. The production line procedures for the integrated processing of the inner and outer rings of bearings generally include raw material preparation, forging, turning, heat treatment, grinding, super finishing, final inspection of parts, and rust prevention storage. The grinding of the inner and outer rings of bearings is a part of the production line for the integrated processing of the inner and outer rings of bearings.

[0003] However, the existing integrated grinding processing device for inner and outer rings of bearings is not convenient for fast and convenient fixing of the inner and outer rings of bearings during operation, and is not suitable for processing bearings of various sizes. At the same time, during the grinding process, the fine dust generated by the grinding is easily dispersed into the nearby air in large quantities and endangers the health of nearby workers. The structure needs to be improved and the practicality needs to be improved. Summary of the invention

[0004] 1. Technical issues to be resolved The purpose of the present invention is to make up for the deficiencies of the prior art and to provide an integrated molding production line for inner and outer rings of bearings.

[0005] (II) Technical solution To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an integrated molding production line for inner and outer rings of bearings, comprising a processing table, a first motor is fixedly installed at the bottom of the processing table, a rotating shaft is connected to the output end of the first motor, and a bearing seat is fixedly connected to the top of the rotating shaft, a cavity is opened inside the bearing seat, and a movable groove is opened on the top of the bearing seat, an inner ring fixing mechanism is fixedly installed inside and on both sides of the bearing seat, the inner ring fixing structure passes through the movable groove and extends to the top of the bearing seat, an outer ring fixing mechanism is fixedly installed on the top of the bearing seat, an L-shaped mounting seat is fixedly installed on one side of the processing table, and an adjustable grinding mechanism is fixedly installed on one side of the mounting seat, and a dust collection mechanism is fixedly installed on the top and bottom of the adjustable grinding mechanism.

[0006] As mentioned above, an annular slide groove is provided on the top of the processing table, and a plurality of sliding connectors are fixedly connected to the bottom of the bearing seat, and the sliding connectors are slidably connected to the slide groove.

[0007] As mentioned above, the inner ring fixing mechanism includes a screw rod, a turntable and an abutment knob. The outside of the screw rod is provided with two threaded parts in the thread direction. The outside of the two threaded parts of the screw rod are screwed with sliders. The tops of the two sliders are fixedly connected with inner support rods. The turntable is fixedly installed on one end of the screw rod. One side of the turntable is rotatably connected with a crank. One end of the abutment knob passes through the turntable by screwing.

[0008] As mentioned above, the screw rod is rotatably installed inside the bearing seat, and both ends of the screw rod extend through to the outside of the bearing seat, the abutment knob abuts against the outer side of the bearing seat, the top end of the inner support rod passes through the movable groove and extends to the top of the bearing seat, and the outer fixed sleeve of the inner support rod is provided with a rubber sleeve.

[0009] As mentioned above, the outer ring fixing mechanism includes a fixing plate, a clamping block and a clamping knob. The outer ring fixing mechanism is provided with two groups. The two fixing plates are fixedly installed on the top of the bearing seat, and the two fixing plates are respectively located on both sides of the movable groove. A V-shaped groove is provided on one side of the clamping block, and a plurality of first guide rods are fixedly connected to the other side of the clamping block. The first guide rods movably penetrate the fixing plate, one end of the clamping knob penetrates the fixing plate by screwing, and one end of the clamping knob penetrating the fixing plate is rotatably connected to one side of the clamping block through a rotating connecting piece.

[0010] The above-mentioned adjustable grinding mechanism includes a first cylinder, a mounting plate, a second cylinder, a lifting frame, a second motor and a grinding disc. The first cylinder is fixedly installed inside the mounting seat in a through-type, the mounting plate is L-shaped, one side of the mounting plate is fixedly connected to the telescopic end of the first cylinder, and one side of the mounting plate is fixedly connected with a plurality of second guide rods, the second guide rods movably penetrate the mounting seat, the second cylinder is fixedly installed on the top of the mounting plate in a through-type, the top of the lifting frame is fixedly connected to the bottom telescopic end of the second cylinder, the second motor is fixedly installed inside the lifting frame, the top of the grinding disc is connected to the output end of the second motor, and the grinding disc is located at the bottom of the lifting frame.

[0011] As mentioned above, the dust collecting mechanism includes an exhaust fan, a dust box and a duct. The dust collecting mechanism is provided with two groups. The exhaust end of the exhaust fan is connected to one side of the dust box, one side of the dust box is hingedly connected to a box door, the internal movable card of the dust box is equipped with a filter plate, one end of the duct is connected to the side of the dust box away from the exhaust fan, and the bottom of the duct is fixedly connected to a dust hood.

[0012] As mentioned above, the exhaust fan and the dust collecting box are both fixedly mounted on the top of the mounting plate, the bottom end of the duct passes through the mounting plate, and the dust collecting cover is inclined toward the grinding disc.

[0013] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: 1. The present invention is provided with an inner ring fixing mechanism and an outer ring fixing mechanism, so that when working, the bearing workpiece can be placed on the bearing seat and its inner ring is located outside the two inner support rods. At this time, the turntable can be rotated by the crank handle to drive the screw rod to rotate. The rotation of the screw rod can synchronously drive the two sliders and the two inner support rods to move away from each other until the two inner support rods are abutted and tightly against the inner ring of the bearing workpiece, so that the inner ring of the bearing workpiece can be quickly and conveniently fixed. Then, the abutment knob can be rotated to make it abut against the outer side of the bearing seat, so that the turntable and the screw rod can be auxiliary fixed to improve the fixing stability of the inner ring of the bearing. Then, the clamping knob can be rotated to drive the clamping block to move until one side of the V-groove of the two clamping blocks abuts and tightly against the outer side of the bearing workpiece, so that the outer ring of the bearing workpiece can be clamped and fixed. The operation is simple, convenient and fast, saving time and effort, and having high efficiency.

[0014] 2. The present invention is provided with an adjustable grinding mechanism, so that according to the actual size requirements of the bearing workpiece, the first cylinder can be started to drive the mounting plate to translate, thereby adjusting the grinding disc to a suitable position, so that it can be suitable for processing bearing workpieces of various sizes, thereby improving the practicality of the device. When working, the second cylinder and the second motor work to drive the grinding disc to move down and rotate, so as to synchronously grind the outer edges of the inner ring and outer ring of the bearing workpiece.

[0015] 3. The present invention is provided with a dust collecting mechanism, so that when working, the exhaust fan, in conjunction with the dust collecting box and the duct, can generate suction at the dust collecting hood, and a large amount of fine dust generated by grinding can be sucked into the dust collecting box, and the filter plate can intercept and filter it for centralized collection, thereby effectively preventing a large amount of dust from floating and endangering nearby workers.

[0016] Other advantages, objectives and features of the present invention will be set forth in part in the following description and, in part, will be apparent to those skilled in the art based on an examination of the following or may be taught from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the installation structure of the bearing seat of the present invention; Figure 3 It is a schematic diagram of the installation structure of the first cylinder of the present invention; Figure 4 It is a schematic diagram of the dissected structure of the screw rod installation of the present invention; Figure 5 for Figure 4 A is an enlarged structural diagram; Figure 6 It is a schematic diagram of the filter plate installation structure of the present invention.

[0018] In the figure: 1, processing table; 2, first motor; 3, rotating shaft; 4, bearing seat; 5, movable groove; 6, inner ring fixing mechanism; 601, screw rod; 602, turntable; 603, abutment knob; 604, threaded portion; 605, slider; 606, inner support rod; 607, crank; 608, rubber sleeve; 7, outer ring fixing mechanism; 701, fixing plate; 702, clamping block; 703, clamping knob; 704, first guide rod; 8, Mounting seat; 9. Adjustable grinding mechanism; 901. First cylinder; 902. Mounting plate; 903. Second cylinder; 904. Lifting frame; 905. Second motor; 906. Grinding disc; 907. Second guide rod; 10. Dust collecting mechanism; 1001. Exhaust fan; 1002. Dust collecting box; 1003. Conduit; 1004. Box door; 1005. Filter plate; 1006. Dust collecting hood; 11. Slide groove; 12. Sliding connector. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figure 1-6 As shown, the present invention provides a technical solution: an integrated molding production line for inner and outer rings of bearings, comprising a processing table 1, a first motor 2 is fixedly installed at the bottom of the processing table 1, a rotating shaft 3 is connected to the output end of the first motor 2, and a bearing seat 4 is fixedly connected to the top of the rotating shaft 3, a cavity is opened inside the bearing seat 4, and a movable groove 5 is opened on the top of the bearing seat 4, an inner ring fixing mechanism 6 is fixedly installed inside and on both sides of the bearing seat 4, the inner ring fixing structure passes through the movable groove 5 and extends to the top of the bearing seat 4, an outer ring fixing mechanism 7 is fixedly installed on the top of the bearing seat 4, an L-shaped mounting seat 8 is fixedly installed on one side of the processing table 1, and an adjustable grinding mechanism 9 is fixedly installed on one side of the mounting seat 8, and a dust collection mechanism 10 is fixedly installed on the top and bottom of the adjustable grinding mechanism 9.

[0021] An annular slide groove 11 is provided on the top of the processing table 1, and a plurality of sliding connectors 12 are fixedly connected to the bottom of the bearing seat 4. The sliding connectors 12 are slidably connected to the slide groove 11, so that the stability of the bearing seat 4 during rotation can be improved.

[0022] The inner ring fixing mechanism 6 includes a screw rod 601, a turntable 602 and an abutment knob 603. The screw rod 601 is provided with two threaded parts 604 in the thread direction on the outside. The two threaded parts 604 of the screw rod 601 are both screwed with sliders 605 on the outside. The tops of the two sliders 605 are fixedly connected with inner support rods 606. The turntable 602 is fixedly installed on one end of the screw rod 601. A crank 607 is rotatably connected to one side of the turntable 602. One end of the abutment knob 603 penetrates the turntable 602 by screwing, so that the bearing workpiece can be placed on the bearing seat 4 during operation and made to The inner ring is located outside the two inner support rods 606. At this time, the turntable 602 can be rotated by the crank 607 to drive the screw rod 601 to rotate. The rotation of the screw rod 601 can synchronously drive the two sliders 605 and the two inner support rods 606 to move away from each other until the two inner support rods 606 are tightly abutted against the inner ring of the bearing workpiece. The inner ring of the bearing workpiece can be quickly and conveniently fixed, and then the abutment knob 603 can be rotated to make it abut against the outer side of the bearing seat 4, so as to assist in fixing the turntable 602 and the screw rod 601 and improve the fixing stability of the inner ring of the bearing.

[0023] The screw rod 601 is rotatably installed inside the bearing seat 4, and both ends of the screw rod 601 extend through to the outside of the bearing seat 4, the abutment knob 603 abuts against the outer side of the bearing seat 4, the top end of the inner support rod 606 passes through the movable groove 5 and extends to the top of the bearing seat 4, and the outer fixing sleeve of the inner support rod 606 is provided with a rubber sleeve 608, which can increase the abutment friction between the inner support rod 606 and the inner ring of the bearing, thereby improving the fixing effect on the inner ring of the bearing.

[0024] The outer ring fixing mechanism 7 includes a fixing plate 701, a clamping block 702 and a clamping knob 703. The outer ring fixing mechanism 7 is provided with two groups. The two fixing plates 701 are fixedly installed on the top of the bearing seat 4, and the two fixing plates 701 are respectively located on both sides of the movable groove 5. A V-shaped groove is provided on one side of the clamping block 702, and a plurality of first guide rods 704 are fixedly connected to the other side of the clamping block 702. The first guide rods 704 movably penetrate the fixing plate 701, and one end of the clamping knob 703 penetrates the fixing plate 701 by screwing, and one end of the clamping knob 703 penetrating the fixing plate 701 is rotatably connected to one side of the clamping block 702 through a rotating connecting piece, so that after the inner ring of the bearing workpiece is fixed, the clamping knob 703 can be rotated to drive the clamping block 702 to move until one side of the V-shaped groove of the two clamping blocks 702 abuts against the outer side of the bearing workpiece, so that the outer ring of the bearing workpiece can be clamped and fixed.

[0025] The adjustable grinding mechanism 9 includes a first cylinder 901, a mounting plate 902, a second cylinder 903, a lifting frame 904, a second motor 905 and a grinding disc 906. The first cylinder 901 is fixedly installed inside the mounting seat 8 in a through-type manner. The mounting plate 902 is L-shaped. One side of the mounting plate 902 is fixedly connected to the telescopic end of the first cylinder 901, and one side of the mounting plate 902 is fixedly connected to a plurality of second guide rods 907. The second guide rods 907 movably penetrate the mounting seat 8. The second cylinder 903 is fixedly installed on the top of the mounting plate 902 in a through-type manner. The top of the lifting frame 904 is fixedly connected to the bottom telescopic end of the second cylinder 903. The second motor 905 is fixedly connected to the bottom telescopic end of the second cylinder 903. 05 is fixedly installed inside the lifting frame 904, the top of the grinding disc 906 is connected to the output end of the second motor 905, and the grinding disc 906 is located at the bottom of the lifting frame 904, so that when working, the first cylinder 901 can be started according to the actual size requirements of the bearing workpiece, driving the mounting plate 902 to translate, thereby adjusting the grinding disc 906 to a suitable position, so that it can be suitable for processing bearing workpieces of various sizes, thereby improving the practicability of the device. When working, the second cylinder 903 and the second motor 905 work, driving the grinding disc 906 to move down and rotate, so as to synchronously grind the outer edges of the inner ring and outer ring of the bearing workpiece.

[0026] The dust collecting mechanism 10 comprises an exhaust fan 1001, a dust collecting box 1002 and a duct 1003. The dust collecting mechanism 10 is provided with two groups. The exhaust end of the exhaust fan 1001 is connected to one side of the dust collecting box 1002. One side of the dust collecting box 1002 is hingedly connected to a box door 1004. The internal movable card of the dust collecting box 1002 is equipped with a filter plate 1005. One end of the duct 1003 is connected to the side of the dust collecting box 1002 away from the exhaust fan 1001. The duct 1003 is connected to the dust collecting box 1002. 3 is fixedly connected with a dust hood 1006, so that when the bearing workpiece is ground, the exhaust fan 1001 can work with the dust box 1002 and the duct 1003 to generate suction at the dust hood 1006, and a large amount of fine dust generated by the grinding can be sucked into the dust box 1002, and the filter plate 1005 can intercept and filter it for centralized collection, thereby effectively preventing a large amount of dust from floating and endangering nearby workers.

[0027] The exhaust fan 1001 and the dust box 1002 are both fixedly mounted on the top of the mounting plate 902 , the bottom end of the conduit 1003 passes through the mounting plate 902 , and the dust cover 1006 is inclined toward the grinding disc 906 .

[0028] Working principle: during operation, the bearing workpiece can be placed on the bearing seat 4, and its inner ring can be located outside the two inner support rods 606. At this time, the turntable 602 can be rotated by the crank 607 to drive the screw rod 601 to rotate. The rotation of the screw rod 601 can synchronously drive the two sliders 605 and the two inner support rods 606 to move away from each other until the two inner support rods 606 are in abutment with the inner ring of the bearing workpiece, so that the inner ring of the bearing workpiece can be quickly and conveniently fixed. Then, the abutment knob 603 can be rotated to make it abut against the outer side of the bearing seat 4, so as to perform auxiliary fixing of the turntable 602 and the screw rod 601 and improve the fixing stability of the inner ring of the bearing. Then, the clamping knob 703 can be rotated to drive the clamping block 702 to move until one side of the V-groove of the two clamping blocks 702 abuts against the outer side of the bearing workpiece, so as to fix the outer ring of the bearing workpiece. Clamping and fixing processing, at this time, according to the actual size requirements of the bearing workpiece, the first cylinder 901 can be started to drive the mounting plate 902 to move horizontally, so as to adjust the grinding disc 906 to a suitable position, so that it can be suitable for processing bearing workpieces of various sizes, thereby improving the practicality of the device. During operation, the second cylinder 903 and the second motor 905 work to drive the grinding disc 906 to move down and rotate, so as to synchronously grind the outer edges of the inner ring and outer ring of the bearing workpiece. In this process, the exhaust fan 1001 can also work in conjunction with the dust box 1002 and the duct 1003 to generate suction at the dust hood 1006, and a large amount of fine dust generated by grinding can be sucked into the dust box 1002, and the filter plate 1005 can be intercepted and filtered for centralized collection, thereby effectively preventing a large amount of dust from floating and endangering nearby workers.

[0029] It should be noted that, in this article, the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected", and "connected" should be understood in a broad sense. For example, "installed" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a mechanical connection or an electrical connection; "connected" can be a direct connection, an indirect connection through an intermediate medium, or a connection between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A production line for integrally forming inner and outer rings of a bearing, comprising a processing table (1), characterized in that: A first motor (2) is fixedly mounted on the bottom of the processing table (1); a rotating shaft (3) is connected to the output end of the first motor (2); a bearing seat (4) is fixedly connected to the top of the rotating shaft (3); a cavity is provided inside the bearing seat (4); a movable groove (5) is provided on the top of the bearing seat (4); an inner ring fixing mechanism (6) is fixedly mounted inside and on both sides of the bearing seat (4); the inner ring fixing structure passes through the movable groove (5) and extends to the top of the bearing seat (4); an outer ring fixing mechanism (7) is fixedly mounted on the top of the bearing seat (4); an L-shaped mounting seat (8) is fixedly mounted on one side of the processing table (1); an adjustable grinding mechanism (9) is fixedly mounted on one side of the mounting seat (8); and dust collecting mechanisms (10) are fixedly mounted on the top and bottom of the adjustable grinding mechanism (9).

2. The one-piece molding production line of the inner and outer rings of a bearing according to claim 1, characterized in that: An annular sliding groove (11) is provided on the top of the processing table (1), and a plurality of sliding connectors (12) are fixedly connected to the bottom of the bearing seat (4), and the sliding connectors (12) are slidably connected to the sliding groove (11).

3. The one-piece molding production line for inner and outer rings of a bearing according to claim 1, characterized in that: The inner ring fixing mechanism (6) comprises a screw rod (601), a rotating disk (602) and an abutting knob (603); the screw rod (601) is provided with two threaded parts (604) in the thread direction on the outside; the two threaded parts (604) of the screw rod (601) are both screwed with sliders (605) on the outside; the tops of the two sliders (605) are both fixedly connected with inner support rods (606); the rotating disk (602) is fixedly mounted on one end of the screw rod (601); one side of the rotating disk (602) is rotatably connected with a crank (607); and one end of the abutting knob (603) penetrates the rotating disk (602) by screwing.

4. The one-piece molding production line for inner and outer rings of a bearing according to claim 3, characterized in that: The screw rod (601) is rotatably mounted inside the bearing seat (4), and both ends of the screw rod (601) extend through the outside of the bearing seat (4), the abutment knob (603) abuts against the outer side of the bearing seat (4), the top end of the inner support rod (606) passes through the movable groove (5) and extends to the top of the bearing seat (4), and the outer fixed sleeve of the inner support rod (606) is provided with a rubber sleeve (608).

5. The one-piece molding production line for inner and outer rings of a bearing according to claim 1, characterized in that: The outer ring fixing mechanism (7) comprises a fixing plate (701), a clamping block (702) and a clamping knob (703). The outer ring fixing mechanism (7) is provided with two groups. The two fixing plates (701) are fixedly mounted on the top of the bearing seat (4), and the two fixing plates (701) are respectively located on both sides of the movable groove (5). A V-shaped groove is provided on one side of the clamping block (702), and a plurality of first guide rods (704) are fixedly connected to the other side of the clamping block (702). The first guide rods (704) movably penetrate the fixing plate (701). One end of the clamping knob (703) penetrates the fixing plate (701) by screwing, and one end of the clamping knob (703) penetrates the fixing plate (701) and is rotatably connected to one side of the clamping block (702) by a rotating connecting piece.

6. The one-piece molding production line of bearing inner and outer rings according to claim 1, characterized in that: The adjustable grinding mechanism (9) comprises a first cylinder (901), a mounting plate (902), a second cylinder (903), a lifting frame (904), a second motor (905) and a grinding disc (906); the first cylinder (901) is fixedly mounted inside the mounting seat (8) in a through-type manner; the mounting plate (902) is L-shaped; one side of the mounting plate (902) is fixedly connected to the telescopic end of the first cylinder (901); and one side of the mounting plate (902) is fixedly connected to a plurality of second guide rods (905). 07), the second guide rod (907) movably passes through the mounting seat (8), the second cylinder (903) is fixedly installed on the top of the mounting plate (902) in a through-type manner, the top of the lifting frame (904) is fixedly connected to the bottom telescopic end of the second cylinder (903), the second motor (905) is fixedly installed inside the lifting frame (904), the top of the grinding disc (906) is connected to the output end of the second motor (905), and the grinding disc (906) is located at the bottom of the lifting frame (904).

7. The one-piece molding production line of the inner and outer rings of a bearing according to claim 6, characterized in that: The dust collecting mechanism (10) comprises an exhaust fan (1001), a dust collecting box (1002) and a duct (1003). The dust collecting mechanism (1003) is provided with two groups. The exhaust end of the exhaust fan (1001) is connected to one side of the dust collecting box (1002). One side of the dust collecting box (1002) is hingedly connected to a box door (1004). The dust collecting box (1002) is internally movable with a filter plate (1005). One end of the duct (1003) is connected to a side of the dust collecting box (1002) away from the exhaust fan (1001). The bottom of the duct (1003) is fixedly connected to a dust collecting cover (1006).

8. The one-piece molding production line for inner and outer rings of a bearing according to claim 7, characterized in that: The exhaust fan (1001) and the dust collecting box (1002) are both fixedly mounted on the top of the mounting plate (902), the bottom end of the duct (1003) passes through the mounting plate (902), and the dust collecting cover (1006) is inclined toward the grinding disc (906).

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