A four-station polishing and dust removal machine

Abstract

The present invention provides a four-station polishing and dust removal machine, belonging to the technical field of fume purification. It solves the problems of poor working efficiency and dust suction effect of the existing polishing and dust removal machines. This product includes a housing with a water spray dust removal chamber. Four air inlets are provided on the side of the housing. A dust shield is further provided outside each air inlet. A motor assembly is provided between two dust shields on the same side. The motor assembly has an output shaft. The two ends of the output shaft respectively extend into the two dust shields on the same side. A grinding disc is further fixed on the output shaft inside the dust shield. The dust shield includes a left side plate, a right side plate, a top cover and a back plate. The back plate is provided with an interface opposite to the air inlet. Open slots for the output shaft to extend through are provided on both the left side plate and the right side plate. A moving door is further provided outside the dust shield at the position of the open slot. The moving door abuts against the side of the dust shield and can block the open slot by sliding. This dust removal machine has the advantages that dust is not easily diffused outward and the dust suction effect is relatively high.

Description

Technical Field

[0001] The present invention belongs to the technical field of fume purification, and relates to a polishing dust collector, in particular to a four-station polishing dust collector. Background Art

[0002] The polishing dust collector is also known as a polishing vacuum cleaner. It is widely used in various dust removal systems in polishing workshops such as foundry, metallurgy, mining, building materials and refractories. It is particularly suitable for places with a relatively high dust concentration. During the polishing and grinding operation, due to the influence of the induced air flow, there will be a phenomenon of dust flying. Without appropriate protective measures, it will seriously endanger the health of operators. Therefore, it is necessary to be equipped with an efficient purification device in this working area to provide clean air for the working environment. The existing polishing dust collectors have too simple structures, and their outer shells are often fixedly connected. When we process different types of workpieces or when the same workpiece needs to be processed through multiple polishing and grinding processes, it is often necessary to switch different polishing dust collectors for processing, which makes the operation very inconvenient. Moreover, the polishing dust collector has a large space occupancy rate, and the price of the equipment itself is relatively expensive, resulting in a substantial increase in our production costs. Therefore, solving the above existing problems is an urgent matter to be dealt with at present. Summary of the Invention

[0003] The purpose of the present invention is to provide a four-station polishing dust collector for the above problems existing in the prior art. It solves the technical problems of poor working efficiency and dust suction effect of the existing polishing dust collectors.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] A four-station polishing dust collector includes a housing with a water spray dust removal chamber. Four air inlets are provided laterally on the housing. The four air inlets are grouped in pairs and are oppositely arranged. A dust shield is provided outside each air inlet. A motor assembly is provided between the two dust shields on the same side. The motor assembly has an output shaft. The two ends of the output shaft respectively extend into the two dust shields on the same side. A grinding disc is fixed on the output shaft inside the dust shield. It is characterized in that the dust shield includes a left side plate, a right side plate, a top cover and a back plate. The back plate is provided with an interface opening facing the air inlet. Open slots for the output shaft to extend through are provided on both the left side plate and the right side plate. A movable door is provided outside the dust shield at the position of the open slot. The movable door abuts against the side of the dust shield and can block the open slot by sliding.

[0006] The side of the outer shell where the water spray dust removal chamber is located has four air inlets. The four air inlets are divided into two groups. Two air inlets are arranged side by side as a group on one side of the outer shell to connect the water spray dust removal chamber with the outside world. The other group of air inlets is arranged on the side of the opposite side of the outer shell where the above-mentioned air inlets are located. The advantage of this is that the relatively arranged air inlets can enable better inhalation of gas when the fan is turned on. When we polish workpieces at the air inlets and generate dust, the dust will be inhaled into the water spray dust removal chamber through the air inlets for purification. The setting of the relatively two groups of air inlets allows us to polish and grind four workpieces simultaneously, greatly improving the work efficiency without any congestion at all.

[0007] A dust shield can be detachably connected to the outside of each air inlet. The function of the dust shield is to block the flying dust. When we polish and grind workpieces at the air inlets, due to the high-speed rotation of the grinding disc, the dust ground off will fly forward or sometimes there will be sparks generated when the workpiece contacts the grinding disc. In this way, the setting of the dust shield can surround the air inlet, block the sparks and dust, enabling them to be better inhaled by the air inlet and purified by the water spray dust removal chamber inside. The dust shield of this product is detachably connected to the outer shell. Since our outer shell has four air inlets and each air inlet represents a processing station, we can freely close or open the number of air inlets according to actual needs to meet our production. After opening the air inlets, we only need to install the dust shield to start production, which is more convenient for multi-station switching.

[0008] The back of the dust shield is provided with a butting port communicating with the air inlet, and the front of the dust shield is also provided with an opening for the workpiece to extend into. The dust shield is in a box shape, and its back is provided with a butting port facing the air inlet to connect the cavity of the dust shield with the water spray dust removal chamber. And the front of the dust shield has an opening through which the workpiece can extend into the cavity for polishing treatment. The dust generated by polishing will enter the water spray dust removal chamber through the butting port for purification. This polishing and dust removal machine also includes a motor assembly between two dust shields on the same side. The motor assembly includes an output shaft that extends into the two dust shields on the same side through the opening groove at the same time. Grinding discs are provided on the output shaft in each dust shield. Grinding discs are provided in both dust shields on the same side, and the grinding discs are driven to rotate by the same motor. One motor controlling the production of two stations greatly reduces the energy consumption and production cost.

[0009] On each dust shield, movable doors are provided on the sides located on both sides of the grinding disc. The reason for setting the movable doors on the sides is that the output shaft of the motor extends into the dust shield from the side, so a groove needs to be opened on this side for the output shaft to extend. However, since this polishing and dust removal machine can independently select the number of working stations according to our needs, when starting a working station, the installation of the dust shield is inevitable. Two dust shields can be placed on the same side of the outer shell, and there must be a space on the adjacent sides of the two dust shields for the output shaft to extend. Therefore, by setting movable doors on both sides of this dust shield, the appearance and structure of the four dust shields are the same. Only by pushing the movable doors to switch positions can the output shaft extend. This setting enables us not to align each dust shield when installing the dust shield, thereby improving the applicability of the dust shield. Moreover, after the dust shield is installed, since the left and right side plates are provided with opening grooves, dust is likely to spread out from the opening grooves during the polishing and grinding process. Therefore, another function of the movable door is that after the output shaft extends into the dust shield, the position of the movable door can be adjusted to minimize the opening groove to the greatest extent without interfering with the operation of the output shaft, achieving the effect of preventing dust from spreading during the grinding process. The advantage of this design is that dust is not easily spread out through the opening grooves, thereby improving the dust collection effect.

[0010] In the above four-station polishing and dust removal machine, upper and lower guide rails are respectively fixed on the upper and lower sides of the opening groove on the dust shield. The movable door is clamped between the upper and lower guide rails, and the movable door can slide relative to the upper and lower guide rails.

[0011] Using the form of upper and lower guide rails to clamp the movable door is relatively stable and convenient for pushing and pulling. Moreover, the friction between the movable door and the lower guide rail under its own gravity is relatively large, so that after moving, the position of the movable door will not change with the processing of the polishing machine and is relatively stable.

[0012] In the above four-station polishing and dust removal machine, a convex edge that protrudes towards the air inlet direction and extends into the air inlet is provided at the docking port on the dust shield.

[0013] The dust shield is abutted against the side of the outer shell. The convex edge on the dust shield has two functions. One is to facilitate the alignment with the air inlet so that the docking port is directly opposite to the air inlet and the relative position between the dust shield and the outer shell is accurately positioned; the other is to make the connection between the docking port and the air inlet smoother. The convex edge directly extends into the water spray dust removal chamber, so that the dust in the dust shield can directly enter the water spray dust removal chamber without leakage or other situations, making the dust inhalation smoother and improving the working efficiency of this polishing and dust removal machine to a certain extent.

[0014] In the above-mentioned four-station polishing and dust removal machine, hemming that can abut against the outer shell is provided on each of the moving doors.

[0015] Hemming is provided on each of the moving doors. The setting of the hemming makes the moving doors more stable when abutting against the outer shell. The hemming can abut against the plane of the outer shell, making the connection between the two more stable and smooth.

[0016] In the above-mentioned four-station polishing and dust removal machine, an arc-shaped cover plate is further provided on the top cover. One end of the cover plate is hinged to the dust shield and the cover plate can rotate around the hinged end.

[0017] The setting of the rotatable cover plate enables us to automatically control the size of the opening in front of the dust shield, making it convenient to place parts of different sizes or irregular shapes into the dust shield for polishing treatment, with high practicability and further improving the adaptability of this polishing machine. Moreover, when a large amount of dust is generated, if the dust has no time to enter the air inlet, it will impact on the cover plate and rebound back into the dust shield, improving the dust suction efficiency of this dust removal machine.

[0018] In the above-mentioned four-station polishing and dust removal machine, an arc-shaped groove is further opened on the cover plate, bolt holes corresponding to the arc-shaped groove are provided on the dust shield, and the cover plate is fixed to the top cover by bolts passing through the bolt holes and the arc-shaped groove in sequence.

[0019] One end of the cover plate is hinged to the dust shield, and the other end is fixed in the arc-shaped groove by bolts. Loosen the bolts to rotate the cover plate for position adjustment, and then tighten it again after adjustment. Such a setting enables the cover plate to be adjusted at any angle, facilitating us to adjust the covering angle of the cover plate according to the actual workpiece size or the degree of dust dispersion, which is relatively convenient.

[0020] In the above-mentioned four-station polishing and dust removal machine, a folding plate that expands outward is further provided on the dust shield below the cover plate.

[0021] The folding plate holds the lower openings of the left side plate and the right side plate. When polishing and grinding, larger particles of impurities will fall. The setting of the folding plate enables the larger particles of impurities to be blocked by the outwardly protruding hemming when falling and fall inside the dust shield. Such a setting has high dust shielding efficiency and is relatively convenient to clean.

[0022] In the above-mentioned four-station polishing and dust removal machine, observation windows are provided between two air inlets on the same side of the outer shell, card slots are provided near the observation windows on the outer shell, and shielding plates are respectively clamped in the card slots, and the observation windows are shielded by the shielding plates.

[0023] The observation window is set so that the internal dust removal can be seen through the opened window to check whether it is operating normally. After removing the baffle, the opened observation window can also be used as a maintenance opening, which is convenient for machine maintenance and repair.

[0024] In the above four-station polishing and dust removal machine, a maintenance opening is provided on the outer shell, and a detachable cover is fixed on the maintenance opening, and a handle for holding is provided on the cover.

[0025] Since the outer shell is a whole structure and it is troublesome to disassemble, the setting of multiple maintenance openings enables us to operate from multiple angles during maintenance, which is convenient for maintenance.

[0026] Compared with the prior art, the advantages of this product are as follows:

[0027] 1. When dust is generated during workpiece grinding at the air inlet, it will be sucked into the water spray dust removal chamber through the air inlet for purification. The setting of the relatively two groups of air inlets enables us to polish and grind four workpieces simultaneously, greatly improving the work efficiency without any congestion.

[0028] 2. Another function of the movable door is that after the output shaft extends into the dust shield, the position of the movable door can be adjusted to minimize the opening slot to the greatest extent without interfering with the operation of the output shaft, achieving the effect of preventing dust diffusion during the grinding process. The advantage of this design is that dust is not easily diffused outward through the opening slot, improving the dust collection effect.

[0029] 3. The setting of the rotatable cover enables us to automatically control the size of the opening in front of the dust shield, making it convenient to place different-sized or irregular parts into the dust shield for polishing treatment. The practicality is high, further improving the adaptability of this polishing machine. Moreover, when a large amount of dust is generated, if the dust has no time to enter the air inlet, it will impact on the cover and rebound back into the dust shield, improving the dust collection efficiency of this dust removal machine. Brief Description of the Drawings

[0030] Figure 1 is the overall structural schematic diagram of the present invention;

[0031] Figure 2 is the schematic diagram of the present invention without the dust shield connected;

[0032] Figure 3 is the connection schematic diagram of the dust shield and the motor assembly of the present invention;

[0033] Figure 4 is the structural schematic diagram of the dust shield of the present invention;

[0034] Figure 5 is the rear view of the dust shield of the present invention;

[0035] Figure 6 is the bottom view of the dust shield of the present invention;

[0036] Figure 7 is the part drawing of the moving door of the present invention;

[0037] Figure 8 is the part drawing of the cover plate of the present invention.

[0038] In the figure, 1 is the outer shell; 11 is the air inlet; 12 is the observation window; 13 is the card slot; 14 is the maintenance port; 2 is the fan; 3 is the dust shield; 31 is the left side plate; 32 is the right side plate; 33 is the top cover; 34 is the back plate; 341 is the docking port; 342 is the convex edge; 35 is the cover plate; 351 is the arc-shaped groove; 36 is the upper guide rail; 37 is the lower guide rail; 38 is the folded edge; 4 is the motor assembly; 41 is the output shaft; 42 is the grinding disc; 5 is the folding plate; 6 is the shielding plate; 7 is the retaining cover; 71 is the handle; 8 is the moving door; 9 is the opening groove. Specific Embodiments

[0039] The following are specific embodiments of the present invention and, in conjunction with the accompanying drawings, further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0040] Embodiment 1

[0041] As Figure 1-4 shown, a four-station polishing and dust removal machine includes an outer shell 1 having a water spray dust removal chamber. A fan 2 is provided at the top of the outer shell 1. Two air inlets 11 communicating with the water spray dust removal chamber are opened on two opposite sides of the outer shell 1. A dust shield 3 is detachably connected to the outside of each air inlet 11. The dust shield 3 includes a left side plate 31, a right side plate 32, a top cover 33, and a back plate 34. The back plate 34 is provided with a docking port 341 facing the air inlet 11. An opening groove 9 for the output shaft 41 to extend into is provided on both the left side plate 31 and the right side plate 32. A moving door 8 is further provided on the outside of the dust shield 3 at the opening groove 9. The moving door 8 abuts against the side surface of the dust shield 3 and can block the opening groove 9 by sliding. The front notch of the dust shield 3 is for the workpiece to extend into. The polishing and dust removal machine further includes a motor assembly 4 between two dust shields 3 on the same side. The motor assembly 4 includes an output shaft 41 that simultaneously extends into the two dust shields 3 on the same side from the opening groove 9. A grinding disc 42 is provided on the output shaft 41 in each dust shield 3.

[0042] This polishing and dust removal machine has a housing 1 of a water spray dust removal chamber. A blower 2 is provided at the top of the housing 1. Two air inlets 11 communicating with the water spray dust removal chamber are provided on each of two opposite sides of the housing 1. A first water curtain plate and a second water curtain plate are provided in this water spray dust removal chamber. An arc-shaped portion one and an arc-shaped portion two that are bent towards each other are respectively provided on the first water curtain plate and the second water curtain plate. A strip-shaped baffle is arranged between the arc-shaped portion one and the arc-shaped portion two. Arc-shaped surfaces one and two that are recessed inward are respectively provided on the two side surfaces of the baffle facing the arc-shaped portion one and the arc-shaped portion two. The lower end of the arc-shaped portion one and the air inlet interval formed on the lower side of the arc-shaped surface one, and the upper side is the air outlet interval formed by the upper end of the arc-shaped portion one and the upper side of the arc-shaped surface one. When the water flow flows down from the first water curtain plate, it will be carried by the air flow into the space between the arc-shaped portion one and the arc-shaped surface one. Under the guidance of the arc-shaped portion one and the arc-shaped surface one, a tornado-shaped air flow will be formed between the two. When the water flow enters, it will move along the surface of the arc-shaped portion one towards the air outlet interval direction. Since the surface of the arc-shaped portion one is arc-shaped, the water flow will generate a centrifugal force during the movement process and thus strike the arc-shaped surface one, and then slide down along the arc-shaped surface one and then strike the side surface at the lower end of the arc-shaped portion one. In this way, with the blower 2 turned on, a vortex-shaped water column will be formed between the arc-shaped portion one and the arc-shaped surface one. Subsequently, when the dust enters, it will be driven by the vortex-shaped water column to rotate and mix repeatedly, so that it is fully mixed with water and separated from the air. Such a setting greatly improves the purification efficiency of the dust in the air. The working principle of the arc-shaped portion two and the arc-shaped surface two is the same as that of the arc-shaped portion one and the arc-shaped surface two, and will not be elaborated here. The side surface of the housing 1 where the water spray dust removal chamber is located has four air inlets 11. The four air inlets 11 are divided into two groups. Two air inlets 11 are in a group and arranged side by side on one side surface of the housing 1 to communicate the water spray dust removal chamber with the outside. The other group of air inlets 11 is arranged on the side surface of the housing 1 opposite to the side where the above air inlets 11 are located. The advantage of this is that the relatively arranged air inlets 11 can enable the blower 2 to better inhale gas when it is turned on. When we polish a workpiece at the air inlet 11 and dust is generated, it will be inhaled into the water spray dust removal chamber for purification. The setting of the two relatively arranged groups of air inlets 11 enables us to polish and grind four workpieces simultaneously, greatly improving the working efficiency and not being crowded at all.

[0043] A dust shield 3 is detachably connected to the outside of each air inlet 11. The function of the dust shield 3 is to block the flying dust. An interface 341 communicating with the air inlet 11 is opened on the back plate 341 of the dust shield 3. The front of the dust shield 3 allows the workpiece to extend in. The workpiece can be extended into the dust shield 3 from the opening for polishing treatment. The dust generated by polishing will enter the water spray dust removal chamber from the interface 341 and be purified. The polishing and dust removal machine further includes a motor assembly 4 between two dust shields 3 on the same side. The motor assembly 4 includes an output shaft 41 that extends into the two dust shields 3 on the same side from the opening groove 9 at the same time. A grinding disc 42 is provided on the output shaft 41 in each dust shield 3. Grinding discs 42 are provided in the two dust shields 3 on the same side, and the grinding discs 42 are driven by the same motor to rotate. One motor controlling the production of two workstations greatly reduces the energy consumption and production cost. When we polish and grind the workpiece at the air inlet 11, due to the high-speed rotation of the grinding disc 42, the dust ground off will fly forward or sometimes there will be sparks generated by the contact between the workpiece and the grinding disc 42. In this way, the setting of the dust shield 3 can surround the air inlet 11, block the sparks and dust so that they can be better inhaled by the air inlet 11 and purified by the water spray dust removal chamber therein. The dust shield 3 of this product is detachably connected to the housing 1. Since our housing 1 has four air inlets 11 and each air inlet 11 represents a processing station, we can freely close or open the number of air inlets 11 according to actual needs to meet our production. After opening the air inlet 11, only need to install the dust shield 3 to carry out production, and it is more convenient to switch between multiple workstations.

[0044] As Figure 2-7 shown, a convex edge 342 that protrudes towards the air inlet 11 and extends into the air inlet 11 is provided at the interface 341 of the dust shield 3. The dust shield 3 abuts against the side of the housing 1. The convex edge 342 on the dust shield 3 has two functions. One is to facilitate the alignment with the air inlet 11 so that the interface 341 is directly opposite to the air inlet 11 and the relative position between the dust shield 3 and the housing 1 is accurately positioned; the other is to make the communication between the interface 341 and the air inlet 11 smoother. The convex edge 342 directly extends into the water spray dust removal chamber so that the dust in the dust shield 3 can directly enter the water spray dust removal chamber without leakage or other situations, making the dust inhalation smoother and improving the working efficiency of this polishing and dust removal machine to a certain extent.

[0045] A movable door 8 is provided on each side of the dust cover 3 on both sides of the grinding disc 42. Upper guide rails 36 and lower guide rails 37 are provided on both sides of the dust cover 3 on both sides of the grinding disc 42. The movable doors 8 are all clamped between the upper guide rails 36 and the lower guide rails 37, and the movable doors 8 can all slide relative to the upper guide rails 36 and the lower guide rails 37. The function of setting the movable doors 8 on the sides is that the output shaft 41 of the motor extends into the dust cover 3 from the side, so a groove needs to be opened on this side for the output shaft 41 to extend in. However, since this polishing and dust removal machine can select how many workstations to open according to our needs, when opening the workstations, the dust cover 3 must be installed accordingly. Two dust covers 3 can be placed on the same side of the outer shell 1. There must be a space on the adjacent sides of the two dust covers 3 that can allow the output shaft 41 to extend in. Therefore, by setting the movable doors 8 on both sides of this dust cover 3, the appearance and structure of the four dust covers 3 are the same. Only by pushing the position of the movable door 8 can the output shaft 41 be allowed to extend in. This setting enables us not to align each dust cover 3 when installing the dust cover 3, thus improving the applicability of the dust cover 3. Using the form of the upper guide rails 36 and the lower guide rails 37 to clamp the movable doors 8 is relatively stable and convenient for pushing and pulling. Moreover, the frictional force between the movable door 8 and the lower guide rail 37 under the action of its own gravity will be relatively large, so that after moving, the position of the movable door 8 will not change with the processing of the polishing machine and is relatively stable.

[0046] Flanges 38 that can abut against the outer shell 1 are provided on the movable doors 8. The setting of the flanges 38 makes the movable doors 8 more stable when abutting against the outer shell 1. The flanges 38 can abut against the plane of the outer shell 1, making the connection between the two more stable and smooth.

[0047] The dust cover 3 is also provided with an arc-shaped cover plate 35. One end of the cover plate 35 is hinged to the dust cover 3, and the cover plate 35 can rotate around the hinged end. The cover plate 35 plays a role in blocking. When a large amount of dust and wind are generated, the dust does not have time to enter the air inlet 11, and then it will impact the inner cavity of the dust cover 3 and rebound and overflow from the opening of the dust cover 3. The function of the cover plate 35 is to better redirect the dust to the front of the air inlet 11. In this way, under the suction of the air inlet 11, the dust diffused in the reverse direction can be sucked into the air inlet 11 again, improving the purification efficiency and working efficiency of this dust collector. An arc-shaped groove 351 is also formed in the cover plate 35. The dust cover 3 is provided with bolt holes corresponding to the arc-shaped groove 351. The cover plate 35 can be fixed by screwing bolts into the bolt holes and the tightness in the arc-shaped groove 351. One end of the cover plate 35 is hinged to the dust cover 3, and the other end is fixed in the arc-shaped groove 351 by bolts. Such a setting enables the cover plate 35 to adjust at any angle, facilitating us to adjust the specific dust-blocking angle according to the actual situation, which is relatively convenient. A folding plate 5 that expands outward and surrounds the bottom of the opening is also provided on the dust cover 3 below the cover plate 35. The folding plate 5 can play a role in expanding the lower side of the opening outward, presenting an open shape. Since relatively large particles of impurities will also fall during polishing, the open shape enables the large-particle impurities to fall inside the dust cover 3, preventing pollution to the external environment and facilitating centralized cleaning of the dust cover 3 later.

[0048] Observation windows 12 are provided between two air inlets 11 on the same side of the outer shell 1. Card slots 13 are provided near the observation windows 12 on the outer shell 1. Dust shields 6 are clamped in the card slots 13, and the observation windows 12 are blocked by the dust shields 6. The setting of the observation windows 12 enables us to see whether the internal dust removal is operating normally by opening the observation windows 12. After removing the dust shields 6, the observation windows 12 are opened and can also be used as a maintenance opening 14, facilitating the maintenance and repair of the machine. Maintenance openings 14 are provided above the observation windows 12 on the outer shell 1. Removable covers 7 are fixed on the maintenance openings 14, and handles 71 for holding are provided on the covers 7. Since the outer shell 1 is an integral structure and is relatively troublesome to disassemble, the setting of multiple maintenance openings 14 enables us to operate from multiple angles during maintenance, facilitating the repair.

[0049] Embodiment 2

[0050] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference lies in that: in this embodiment, the upper track and the lower track are protruding fins, and sliding grooves are provided at both the upper and lower ends of the moving door. The fins are clamped in the sliding grooves and can also play a role in clamping the moving door, and the moving doors can also move relative to the dust cover.

[0051] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways of substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A four-station polishing and dust removal machine, comprising a housing (1) with a water spray dust removal chamber. Four air inlets (11) are provided on the side of the housing (1). The four air inlets (11) are grouped in pairs of two and are oppositely arranged. A dust shield (3) is further provided outside each air inlet (11). A motor assembly (4) is provided between two dust shields (3) on the same side. The motor assembly (4) has an output shaft (41). Both ends of the output shaft (41) extend into the two dust shields (3) on the same side respectively. A grinding disc (42) is further fixed on the output shaft (41) inside the dust shield (3). It is characterized in that, The dust cover (3) includes a left side plate (31), a right side plate (32), a top cover (33) and a back plate (34). The back plate (34) is provided with a butting port (341) facing the air inlet (11). Open slots (9) through which the output shaft (41) can extend are formed in both the left side plate (31) and the right side plate (32). A movable door (8) is further provided at the outer side of the dust cover (3) at the position of the open slot (9). The movable door (8) abuts against the side surface of the dust cover (3) and can block the open slot (9) by sliding. An arc-shaped cover plate (35) is further provided on the top cover (33). One end of the cover plate (35) is hinged to the dust cover (3) and the cover plate (35) can rotate around the hinged end. An arc-shaped slot (351) is formed in the cover plate (35). Bolt holes corresponding to the arc-shaped slot (351) are formed in the top cover (33). The cover plate (35) is fixed to the top cover (33) by bolts passing through the bolt holes and the arc-shaped slot (351) in sequence.

2. The four-station polishing and dust removal machine according to claim 1, characterized in that, Upper guide rails (36) and lower guide rails (37) are respectively fixed on the upper and lower sides of the dust cover (3) at the position of the open slot (9). The movable door (8) is clamped between the upper guide rail (36) and the lower guide rail (37), and the movable door (8) can slide relative to the upper guide rail (36) and the lower guide rail (37).

3. The four-station polishing and dust removal machine according to claim 2, wherein, A convex edge (342) which protrudes towards the air inlet (11) direction and extends into the air inlet (11) is provided on the dust cover (3) at the position of the butting port (341).

4. The four-station polishing and dust removal machine according to claim 3, wherein, Flanging (38) which can abut against the housing (1) is provided on the movable door (8).

5. A four-station polishing and dust removal machine according to any one of claims 1-4, characterized in that, A folding plate (5) which expands outwards is further provided on the dust cover (3) below the cover plate (35).

6. A four-station polishing and dust removal machine according to claim 5, characterized in that, Observation windows (12) are provided between two air inlets (11) on the same side of the housing (1). Card slots (13) are provided near the observation windows (12) on the housing (1). Shading plates (6) are respectively clamped in the card slots (13). The observation windows (12) are blocked by the shading plates (6).

7. The four-station polishing and dust removal machine according to claim 6, characterized in that, An inspection opening (14) is further provided on the housing (1). Removable cover plates (7) are fixed on the inspection openings (14), and handles (71) for holding are provided on the cover plates (7).

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