A shot blasting device for bar stock

Abstract

This application relates to a shot blasting apparatus for bar stock, belonging to the field of shot blasting equipment. It includes a shot blasting machine body, a dust collection pipe fixedly connected to one side wall of the shot blasting machine body, and a dust collection box installed on the dust collection pipe. The dust collection box includes a filter screen plate fixedly connected inside the dust collection box. The filter screen plate is vertically arranged, and a dust storage box with an open upper surface is installed at the bottom end of the filter screen plate. The dust storage box is slidably connected to the inner bottom wall of the dust collection box. A cleaning port is opened on one side wall of the dust collection box, and a door for sealing the cleaning port is hinged at the cleaning port. The bottom surface of the dust storage box contacts the inner bottom wall of the dust collection box, and the bottom end of the filter screen plate contacts the inner bottom wall of the dust storage box. A locking element is installed on the dust storage box to lock the filter screen plate to the dust storage box. This application has a low cost and high dust removal efficiency for the shot blasting process.

Description

Technical Field

[0001] This application relates to the field of shot blasting equipment, and more particularly to a shot blasting apparatus for bar stock. Background Technology

[0002] Tracked shot blasting machine is a common type of shot blasting machine. It is suitable for cleaning the surfaces of various parts and belongs to a type of small shot blasting machine.

[0003] Tracked shot blasting machines generate a large amount of dust during the shot blasting process, which contains a significant amount of residue. Therefore, dust removal is necessary during the shot blasting process. A common practice is to install a separate, large dust collection unit near the shot blasting equipment, transporting the dust-laden gas generated during shot blasting through pipelines to this unit for treatment. However, installing a separate large dust collection unit is costly. Another common dust removal method is to directly exhaust air from the shot blasting equipment through pipelines, with filters installed inside the pipelines. The filtered air is then discharged directly through the pipelines. However, dust accumulation on the filters can clog them, resulting in lower dust removal efficiency. Summary of the Invention

[0004] To achieve dust removal in the shot blasting process at a lower cost and with higher dust removal efficiency, this application provides a shot blasting cleaning machine.

[0005] The shot blasting machine provided in this application adopts the following technical solution: A shot blasting device for bar stock includes a shot blasting machine body, a dust removal pipe fixedly connected to one side wall of the shot blasting machine body, and a dust removal box installed on the dust removal pipe. The dust removal box includes a filter screen plate fixedly connected inside the dust removal box. The filter screen plate is vertically arranged, and a dust storage box with an open upper surface is installed at the bottom end of the filter screen plate. The dust storage box is slidably connected to the inner bottom wall of the dust removal box. A cleaning port is opened on one side wall of the dust removal box, and a door for sealing the cleaning port is hinged at the cleaning port. The bottom surface of the dust storage box contacts the inner bottom wall of the dust removal box, and the bottom end of the filter screen plate contacts the inner bottom wall of the dust storage box. A locking element is installed on the dust storage box to lock the filter screen plate and the dust storage box together.

[0006] By adopting the above technical solution, the shot blasting device is equipped with a dust removal pipe connected to the shot blasting machine body and a dust removal box installed on the dust removal pipe. A vertically arranged filter screen inside the dust removal box filters the dust generated during the shot blasting process. The dust is intercepted on the filter screen and falls into a dust collection box with an opening at the bottom. This structure is simple and achieves effective dust removal during the shot blasting process without the need for complex equipment or high costs. Simultaneously, a cleaning port is opened on one side wall of the dust removal box and a hinged door is provided, facilitating periodic opening of the door to clean the dust inside the dust collection box. This ensures the filtration effect of the filter screen, thereby improving dust removal efficiency and achieving high-efficiency dust removal at a relatively low cost.

[0007] Preferably, the filter screen is provided with a locking groove for a vertical door on the side wall away from the shot blasting machine body, and the dust collection box is also provided with a locking groove for a vertical door on one inner side wall. The bottom wall of each locking groove is provided with several protrusions arranged along the length of the locking groove. The locking component includes a locking rod, and several plastic cards are fixedly connected to the two side walls of the locking rod. Each card is gradually tilted from the direction close to the door body to the direction away from the locking rod. Each card abuts against the corresponding protrusion. The side wall of the dust collection box away from the door body is provided with a disassembly port for aligning with the locking rod.

[0008] By adopting the above technical solution, during installation, the locking rod is inserted into the locking slots of the filter screen and the dust collection box. Because the card is plastic and gradually tilts away from the locking rod from the direction closest to the door, the card slides into the locking slot and abuts against each protrusion, thus locking the filter screen and dust collection box together, ensuring a stable connection and guaranteeing stable dust collection. When disassembly is required, the locking rod can be pulled out of the two locking slots through the disassembly port, releasing the card from the locking slots. During the installation and disassembly of the locking rod, the card moves within each locking slot and presses against each protrusion. The plastic card deforms, disengaging from each protrusion, causing the filter screen to vibrate and allowing dust on the filter screen to fall into the dust collection box.

[0009] Preferably, the disassembly port is fitted with a mounting platform, and a mounting rod is threadedly connected to the mounting platform. The locking rod has a threaded hole at one end near the mounting platform, and one end of the mounting rod is threadedly connected to the threaded hole.

[0010] By adopting the above technical solution, after the locking rod is installed, the two can be locked by threading the mounting rod and the locking rod together, so that the locking rod is securely installed. When removing the locking rod, pull the mounting rod. Since the mounting rod is connected to the locking rod, the mounting rod will drive the mounting platform to disengage from the disassembly port, thereby driving the locking rod to disengage and completing the removal of the locking rod. The operation is convenient and quick.

[0011] Preferably, the diameter of the mounting platform gradually decreases along the direction closer to the interior of the dust collection box.

[0012] By adopting the above technical solution, the diameter of the mounting platform gradually decreases along the direction closer to the inside of the dust collection box. This structure makes it easier for the mounting platform to be inserted into the disassembly port with damping, reducing the installation difficulty and improving the installation efficiency.

[0013] Preferably, the filter screen plate has a cleaning cavity inside, and the bottom surface of the filter screen plate has an opening. The filter screen plate includes filter plates located on both sides of the cleaning cavity, and each filter plate has several rows of filter holes. A cleaning mechanism is installed inside the cleaning cavity. The cleaning mechanism includes a fixing block fixedly connected to the inner wall of the cleaning cavity. A connecting rod is provided between the fixing block and the top wall of the cleaning cavity. Several cleaning rods are fixedly connected to the connecting rod. Several bristles are provided on both sides of the cleaning rod. Each cleaning rod is located between adjacent rows of filter holes. A spring is installed between the connecting rod and the top wall of the cleaning cavity. The lower end of the connecting rod passes through the fixing block. A limiting block that abuts against the upper surface of the fixing block is fixedly connected to the connecting rod. An adjusting component that pushes the connecting rod to rise and fall is installed on the filter screen plate.

[0014] By adopting the above technical solution, the cleaning cavity inside the filter screen, in conjunction with the cleaning mechanism, can clean the filter holes on the filter screen. During cleaning, the connecting rod is raised and lowered by the adjusting component. Because the cleaning rod is fixed on the connecting rod, and the cleaning rod has bristles on both sides of its side walls located between adjacent rows of filter holes, when the connecting rod moves up and down under the action of the spring, it drives the cleaning rod and bristles to move. The bristles contact the inner wall of the filter holes, thereby effectively removing dust and other debris from the filter holes. At the same time, the cooperation between the limiting block and the fixing block can prevent the connecting rod from moving excessively, ensuring the stability of the cleaning process.

[0015] Preferably, the filter screen has a connection port on one side wall near the cleaning port, and a support rod located below the fixing block is fixedly connected to the inner wall of the cleaning cavity. The adjusting component includes an adjusting rod and a plurality of hemispherical blocks fixedly connected to the upper side of the adjusting rod. The adjusting rod is inserted into the connection port and overlaps the upper surface of the support rod.

[0016] By adopting the above technical solution, the adjusting rod can be inserted into the cleaning cavity through the connecting port and overlapped on the support rod. Multiple hemispherical blocks on the upper side of the adjusting rod interact with the connecting rod as the adjusting rod moves. When the adjusting rod moves, causing the hemispherical blocks to push the connecting rod, the connecting rod overcomes the spring force and rises, driving the cleaning rod upwards. The bristles on both sides of the cleaning rod clean the adjacent rows of filter holes. When the hemispherical blocks leave the connecting rod, the spring returns to its original shape, causing the connecting rod to descend. This process repeats, effectively cleaning the filter holes and ensuring the filtration effect of the filter screen.

[0017] Preferably, the dust removal pipe includes a first pipe and a second pipe. The end of the first pipe away from the dust removal box is connected to the shot blasting machine body. An exhaust fan is installed at the end of the second pipe away from the dust removal box. Hollow plates are fixed and connected to the ends of the first and second pipes that are close to each other. Several connecting pipes are fixedly connected to the side walls of the two hollow plates that are close to each other. The end of each connecting pipe that is close to the dust removal box is fixed and connected to the dust removal box.

[0018] By adopting the above technical solution, the arrangement of multiple connecting pipes allows gas to enter the dust collection box from different positions, which facilitates the gas to pass through the filter screen more evenly, thereby improving filtration efficiency and effect.

[0019] Preferably, each connecting pipe near the first pipe is inclined downwards gradually in the direction of approaching the dust collection box.

[0020] By adopting the above technical solution, during the operation of the bar shot blasting device, the exhaust fan directs the dust-laden airflow through a primary pipe and a connecting pipe into the dust collection box. The connecting pipe, closer to the primary pipe, gradually slopes downwards towards the dust collection box. As the dust-laden airflow flows within the inclined connecting pipe, larger dust particles settle more easily due to gravity and slide down the inclined pipe wall into the dust collection box, reducing the accumulation of larger dust particles within the connecting pipe and improving airflow conveying efficiency.

[0021] In summary, this application includes at least one of the following beneficial technical effects: 1. High dust removal efficiency is achieved at a relatively low cost; 2. To facilitate the dust on the filter screen falling into the dust collection box; 3. Ensure the stability of the cleaning process. Attached Figure Description

[0022] Figure 1 This is a schematic diagram illustrating the overall structure of the shot blasting device in an embodiment of this application.

[0023] Figure 2 This is a schematic diagram illustrating the internal structure of the dust collector according to an embodiment of this application.

[0024] Figure 3 This is a schematic diagram illustrating the structure of the locking lever in an embodiment of this application.

[0025] Figure 4 This is a schematic diagram illustrating the structure of the cleaning mechanism in an embodiment of this application.

[0026] Explanation of reference numerals in the attached drawings: 1. Shot blasting machine body; 2. Dust removal pipe; 21. Pipe 1; 22. Pipe 2; 23. Hollow plate; 24. Connecting pipe; 3. Dust collection box; 31. Slide groove; 32. Cleaning port; 33. Door; 34. Disassembly port; 35. Mounting platform; 36. Mounting rod; 4. Filter screen plate; 41. Locking groove; 411. Protrusion; 42. Cleaning cavity; 43. Filter plate; 431. Filter hole; 44. Connection port; 5. Dust collection box; 51. Slide rod; 6. Locking rod; 61. Card; 7. Cleaning mechanism; 71. Fixing block; 72. Connecting rod; 73. Cleaning rod; 74. Spring; 75. Support rod; 76. Adjusting rod; 77. Hemispherical block. Detailed Implementation

[0027] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0028] This application discloses a shot blasting apparatus for bar stock. (Refer to...) Figure 1 and Figure 2 The shot blasting device includes a shot blasting machine body 1, a dust collection pipe 2, and a dust collection box 3. The dust collection pipe 2 is fixedly connected to one side wall of the shot blasting machine body 1, and the dust collection box 3 is installed on the dust collection pipe 2. A vertically arranged filter screen 4 is fixedly connected inside the dust collection box 3. The dust-laden gas generated inside the shot blasting machine body 1 is transported to the dust collection box 3 for treatment through the dust collection pipe 2, thereby achieving the effect of removing dust generated during the shot blasting process.

[0029] The dust collection pipe 2 includes a first pipe 21 and a second pipe 22, with the dust collection box 3 located between the first pipe 21 and the second pipe 22. The end of the first pipe 21 furthest from the dust collection box 3 is connected to the shot blasting machine body 1, and an exhaust fan is installed at the end of the second pipe 22 furthest from the dust collection box 3. The exhaust fan can be a centrifugal exhaust fan or an axial flow exhaust fan.

[0030] Reference Figure 1 and Figure 2 Both pipes 21 and 22 have a hollow plate 23 fixed and connected to their adjacent ends. The hollow plate 23 is vertically arranged, and several connecting pipes 24 are fixedly connected to one of the adjacent side walls of the two hollow plates 23. The end of each connecting pipe 24 near the dust collector 3 is fixed and connected to the dust collector 3. This structure allows dust-laden gas to smoothly enter the dust collector 3 through pipe 21, hollow plate 23, and connecting pipes 24. Each connecting pipe 24 near pipe 21 gradually slopes downwards towards the dust collector 3. This slope facilitates better flow of dust-laden gas into the dust collector 3 and reduces dust accumulation in the connecting pipe 24. Furthermore, the arrangement of multiple connecting pipes 24 allows the gas to pass through the filter screen 4 more evenly, improving filtration efficiency.

[0031] Reference Figure 2 and Figure 3 A dust collection box 5 with an open upper surface is installed at the bottom of the filter screen plate 4. The dust collection box 5 is slidably connected to the bottom wall of the dust removal box 3. The dust collection box 5 is used to collect the filtered dust. Two sliding rods 51 are fixedly connected to the bottom wall of the dust collection box 5. Two sliding grooves 31 are opened on the inner wall of the dust removal box 3. Each sliding rod 51 is slidably connected to the corresponding sliding groove 31.

[0032] Reference Figure 1 and Figure 2A cleaning port 32 is provided on one side wall of the dust collection box 3. A door 33 for sealing the cleaning port 32 is hinged to the cleaning port 32. Opening the door 33 allows the dust collection box 5 to be pulled away from the dust collection box 3, thus enabling cleaning of the dust collection box 5. The bottom surface of the dust collection box 5 contacts the inner bottom wall of the dust collection box 3, and the bottom end of the filter screen 4 contacts the inner bottom wall of the dust collection box 5. This arrangement ensures that dust can fall smoothly into the dust collection box 5. A locking device is installed on the dust collection box 5 to lock the filter screen 4 and the dust collection box 5 together. This combination of the dust collection box 5 and the filter screen 4 organically combines filtration and dust collection functions. When dust-laden gas passes through the filter screen 4, the dust is intercepted and falls into the dust collection box 5 under gravity. The dust collection box 5 can effectively collect dust, facilitating subsequent cleaning.

[0033] Reference Figure 2 and Figure 3 A locking groove 41 is provided on the side wall of the filter screen plate 4 away from the shot blasting machine body 1, and a locking groove 41 is also provided on the inner side wall of the dust storage box 5. Each locking groove 41 extends along the direction of the dust storage box 5, and the bottom wall of each locking groove 41 is provided with several protrusions 411 arranged along the length direction of the locking groove 41.

[0034] The locking mechanism includes a locking rod 6, with several plastic clips 61 fixedly connected to both side walls of the locking rod 6. Each clip 61 gradually tilts away from the locking rod 6 along the direction close to the door 33, and each protrusion 411 gradually tilts towards the bottom wall of the locking groove 41 along the direction close to the door 33. The locking rod 6 is simultaneously inserted into two locking grooves 41, and each clip 61 abuts against the corresponding protrusion 411. This structure allows the locking rod 6 to securely connect the filter screen 4 and the dust collection box 5.

[0035] The dust collector 3 has a disassembly port 34 on its side wall away from the door 33, which is aligned with the locking rod 6 for easy disassembly and installation. A mounting platform 35 is damped and inserted into the disassembly port 34. The diameter of the mounting platform 35 gradually decreases towards the interior of the dust collector 3. This tapered structure makes it easier for the mounting platform 35 to be inserted into the disassembly port 34, and ensures a tight fit after insertion, limiting dust leakage.

[0036] A mounting rod 36 is threaded onto the mounting platform 35. A threaded hole is provided at one end of the locking rod 6 near the mounting platform 35, and one end of the mounting rod 36 is threaded into this hole. The mounting platform 35 and the locking rod 6 can be connected together by rotating the mounting rod 36. To remove the locking rod 6, pull the mounting rod 36 until it disengages the mounting platform 35 and the locking rod 6 from the disassembly port 34 and lock the locking groove 41.

[0037] Reference Figure 3 and Figure 4The filter plate 4 has a cleaning cavity 42 inside, and an opening on the bottom surface of the filter plate 4 to allow dust inside the cleaning cavity 42 to fall into the dust collection box 5. The filter plate 4 includes filter plates 43 located on both sides of the cleaning cavity 42, and each filter plate 43 has several rows of filter holes 431. A cleaning mechanism 7 is installed inside the cleaning cavity 42 to clean each filter plate 43.

[0038] The cleaning mechanism 7 includes a fixing block 71 fixedly connected to the inner wall of the cleaning cavity 42, and the fixing block 71 is located at the lower end of the cleaning cavity 42. A connecting rod 72 is provided between the fixing block 71 and the top wall of the cleaning cavity 42. The connecting rod 72 is vertically upward, and several cleaning rods 73 are fixedly connected to the connecting rod 72. Several bristles are provided on both sides of the cleaning rods 73, and each cleaning rod 73 is located between adjacent rows and columns of filter holes 431.

[0039] A spring 74 is fixedly connected to the inner top wall of the cavity 42, and the upper end of the connecting rod 72 abuts against the lower end of the spring 74. The lower end of the connecting rod 72 passes through the fixed rod and extends downward. An adjusting component is installed on the filter screen 4 to push the connecting rod 72 up and down.

[0040] When the adjusting member pushes the connecting rod 72 up and down, the bristles can clean the filter holes 431, reducing the occurrence of filter hole 431 clogging. A limiting block is fixedly connected to the connecting rod 72, which abuts against the upper surface of the fixing block 71. The limiting block prevents the connecting rod 72 from disengaging downward from the fixing block 71.

[0041] Reference Figure 3 and Figure 4 A connection port 44 is provided on the side wall of the filter screen plate 4 near the cleaning port 32, and the connection port 44 communicates with the interior of the cleaning cavity 42. A support rod 75 is fixedly connected to the inner wall of the cleaning cavity 42. The support rod 75 is arranged parallel to the cleaning rod 73 and is located below the fixing block 71.

[0042] The adjusting component includes an adjusting rod 76 and multiple hemispherical blocks 77 fixedly connected to the upper side of the adjusting rod 76. The adjusting rod 76 is inserted into the connecting port 44 and overlaps the upper surface of the support rod 75. The adjusting rod 76 and the support rod 75 are slidably connected along the length of the support rod 75. To ensure the linear sliding of the adjusting rod 76, a guide rail is provided on the support rod 75, and a guide rod is provided on the adjusting rod 76 that is slidably connected to the guide rail.

[0043] When the adjusting rod 76 is pushed, the hemispherical block 77 pushes the connecting rod 72 upward, thereby driving the cleaning rod 73 to move. When the adjusting rod 76 retracts, the spring 74 causes the connecting rod 72 to descend, returning it to its initial position. The cooperation of the adjusting rod 76, the hemispherical block 77, and the connecting rod 72 achieves effective control of the cleaning mechanism 7. The filter holes 431 can be easily cleaned by simply manually operating the adjusting rod 76, improving filtration efficiency. The connecting port 44 is aligned with the cleaning port 32, allowing the door 33 to be opened, and the adjusting rod 76 can be moved by hand.

[0044] The implementation principle of the shot blasting device for bar stock according to this application embodiment is as follows: Through a reasonable structural design, the shot blasting device for bar stock effectively transports the dust-laden gas inside the shot blasting machine body 1 to the dust collection box 3, filters it using the filter screen 4, and collects the dust through the dust storage box 5. Meanwhile, the inclusion of locking components, a cleaning mechanism 7, and adjusting components facilitates equipment maintenance and cleaning, improving overall dust removal efficiency and service life.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A shot blasting apparatus for bar stock, characterized in that: The assembly includes a shot blasting machine body (1), a dust removal pipe (2) fixedly connected to one side wall of the shot blasting machine body (1), and a dust removal box (3) installed on the dust removal pipe (2). The dust removal box (3) includes a filter screen plate (4) fixedly connected inside the dust removal box (3). The filter screen plate (4) is vertically arranged, and a dust storage box (5) with an open upper surface is installed at the bottom end of the filter screen plate (4). The dust storage box (5) is slidably connected to the inner bottom wall of the dust removal box (3). A cleaning port (32) is opened on one side wall of the dust removal box (3). A door (33) for sealing the cleaning port (32) is hinged at the cleaning port (32). The bottom surface of the dust storage box (5) contacts the inner bottom wall of the dust removal box (3). The bottom end of the filter screen plate (4) contacts the inner bottom wall of the dust storage box (5). A locking member is installed on the dust storage box (5) to lock the filter screen plate (4) and the dust storage box (5).

2. The shot blasting device for bar stock according to claim 1, characterized in that: The filter screen (4) has a locking groove (41) for a vertical door (33) on one side wall away from the shot blasting machine body (1). The dust collection box (5) also has a locking groove (41) for a vertical door (33) on one inner side wall. Each locking groove (41) has several protrusions (411) arranged along the length of the locking groove (41) on its bottom wall. The locking component includes a locking rod (6). Several plastic cards (61) are fixedly connected to the two side walls of the locking rod (6). Each card (61) gradually tilts from the direction close to the door (33) to the direction away from the locking rod (6). Each card (61) abuts against the corresponding protrusion (411). The dust collection box (3) has a disassembly port (34) for aligning with the locking rod (6) on one side wall away from the door (33).

3. The shot blasting device for bar stock according to claim 2, characterized in that: The disassembly port (34) is damped and connected to a mounting platform (35). A mounting rod (36) is threadedly connected to the mounting platform (35). A threaded hole is opened at one end of the locking rod (6) near the mounting platform (35). One end of the mounting rod (36) is threadedly connected to the threaded hole.

4. The shot blasting apparatus for bar stock according to claim 3, characterized in that: The diameter of the mounting platform (35) gradually decreases along the direction closer to the interior of the dust collection box (3).

5. A shot blasting device for bar stock according to claim 1, characterized in that: The filter plate (4) has a cleaning cavity (42) inside, and the bottom surface of the filter plate (4) has an opening. The filter plate (4) includes filter plates (43) located on both sides of the cleaning cavity (42). Each filter plate (43) has several rows of filter holes (431). A cleaning mechanism (7) is installed in the cleaning cavity (42). The cleaning mechanism (7) includes a fixing block (71) fixedly connected to the inner wall of the cleaning cavity (42). A connecting rod (72) is provided between the fixing block (71) and the top wall of the cleaning cavity (42). A number of cleaning rods (73) are fixedly connected to the connecting rod (72). The two sides of the cleaning rod (73) are provided with a number of bristles. Each cleaning rod (73) is located between adjacent rows and columns of filter holes (431). A spring (74) is installed between the connecting rod (72) and the top wall of the cleaning cavity (42). The lower end of the connecting rod (72) passes through the fixing block (71). A limiting block that abuts against the upper surface of the fixing block (71) is fixedly connected to the connecting rod (72). An adjusting component that pushes the connecting rod (72) up and down is installed on the filter screen plate (4).

6. A shot blasting apparatus for bar stock according to claim 5, characterized in that: The filter screen (4) has a connection port (44) on one side wall near the cleaning port (32). The inner wall of the cleaning cavity (42) is fixedly connected to a support rod (75) located below the fixing block (71). The adjusting component includes an adjusting rod (76) and a plurality of hemispherical blocks (77) fixedly connected to the upper side of the adjusting rod (76). The adjusting rod (76) is inserted into the connection port (44) and the adjusting rod (76) overlaps the upper surface of the support rod (75).

7. A shot blasting apparatus for bar stock according to claim 1, characterized in that: The dust removal pipe (2) includes a first pipe (21) and a second pipe (22). The end of the first pipe (21) away from the dust removal box (3) is connected to the shot blasting machine body (1). The end of the second pipe (22) away from the dust removal box (3) is equipped with an exhaust fan. The ends of the first pipe (21) and the second pipe (22) that are close to each other are fixed and connected to a hollow plate (23). Several connecting pipes (24) are fixedly connected to the side walls of the two hollow plates (23) that are close to each other. The end of each connecting pipe (24) that is close to the dust removal box (3) is fixed and connected to the dust removal box (3).

8. A shot blasting apparatus for bar stock according to claim 7, characterized in that: Each connecting pipe (24) near the pipe (21) is gradually inclined downward in the direction of the dust collection box (3).

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