A clara tube production apparatus

Abstract

The present application relates to a kind of clara tube production equipment, comprising: frame structure;Lifting mechanism is arranged on frame structure, and is connected with flame gun, lifting assembly includes screw adjusting assembly and guide assembly, guide assembly is connected with the mounting connector installed on frame structure, the upper portion of mounting connector is arc structure, when screw adjusting assembly act, guide assembly can drive flame gun along mounting connector and do arc movement;Flexible board, rotation is installed on mounting connector, flexible board is matched with the abutment piece of connecting guide assembly, can drive flexible board to extend outward when flame gun does arc movement;Inclination adjusting assembly is set on flexible sleeve plate and is used to adjust the angle of flexible board, second pulley is rotationally installed on inclination adjusting assembly, second pulley is rolled with the guide plate set on mounting connector, by setting flexible board, the stability of the stability of flame gun when ejecting flame is improved.

Description

Technical Field

[0001] This invention relates to the field of kraft tube production, specifically to kraft tube production equipment. Background Technology

[0002] Krah pipe is a hot-wound high-density polyethylene (HDPE) spiral wound structured pipe. This pipe uses HDPE resin as the main raw material and a hot-wound process, with a polypropylene (PP) single-wall corrugated pipe as the supporting structure, resulting in a special structural wall pipe with high resistance to external pressure. Krah pipe products are available in four series: PR, OP, SQ, and VW.

[0003] During the production of carat tubes, they need to be heated. The existing heating method is mostly to use a flame gun to spray flames for heating. This method is relatively simple and has a small amount of heat loss. However, when there is an external wind, it will affect the heating of the carat tube by the flame gun. Specifically, the external wind will cause the burning point of the flame sprayed by the flame gun to be less concentrated, and may even change the blue flame to a red or pink flame, resulting in insufficient heating temperature for the carat tube and a reduction in the quality of the carat tube. Summary of the Invention

[0004] The purpose of this invention is to provide a kraft tube production device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A carat tube production apparatus, comprising:

[0007] Frame structure;

[0008] A lifting mechanism is installed on the frame structure and connected to a flame gun. The lifting assembly includes a threaded adjustment assembly and a guide assembly. The guide assembly is connected to a mounting connector installed on the frame structure. The upper part of the mounting connector has an arc-shaped structure. When the threaded adjustment assembly is activated, the guide assembly can drive the flame gun to move in an arc along the mounting connector.

[0009] A telescopic plate is rotatably mounted on the mounting connector. The telescopic plate is adapted to the abutment connecting the guide assembly and can extend outward when the flame gun makes an arc movement.

[0010] An angle adjustment assembly is provided on the telescopic sleeve plate for adjusting the angle of the telescopic plate. A second pulley is rotatably mounted on the angle adjustment assembly, and the second pulley is in rolling cooperation with a guide plate provided on the mounting connector.

[0011] As a further embodiment of the present invention: the threaded adjustment assembly includes a vertical plate fixedly installed on the frame structure, a hysteresis groove is formed in the vertical plate, a slider is slidably installed in the hysteresis groove, and a lead screw is rotatably installed in the hysteresis groove, the lead screw being threadedly engaged with a threaded sleeve disposed in the slider.

[0012] The threaded adjustment assembly also includes a motor mounted on the vertical plate, the output shaft of which is connected to the lead screw.

[0013] As a further embodiment of the present invention: the guide component includes an arc-shaped groove fixedly installed on the mounting connector and an arc-shaped slide plate slidably installed in the arc-shaped groove. The arc-shaped slide plate is fixedly connected to the flame gun, and the arc-shaped slide plate is connected to the slider through a fitting kit.

[0014] As a further embodiment of the present invention: the fitting kit includes a support rod fixedly connected to the arc-shaped sliding plate, and a pulley is rotatably mounted on one end of the support rod away from the arc-shaped sliding plate;

[0015] The fitting kit also includes a horizontal rod fixedly connected to the slider, and the horizontal rod has a guide groove along its length, and the first pulley can roll in the guide groove.

[0016] As a further embodiment of the present invention: the telescopic plate includes a rotating sleeve plate, the rotating sleeve plate is connected to the mounting connector via a rotating shaft, and the telescopic plate is slidably sleeved inside the rotating sleeve plate;

[0017] A through groove is provided on the side wall of the rotating sleeve plate, and the abutting member can pass through the through groove to abut against the telescopic plate. The abutting member is connected to the arc-shaped sliding plate through a crossbar.

[0018] As a further embodiment of the present invention: the tilt adjustment assembly includes a fitting fixedly installed on the outer wall of the rotating sleeve plate, a sliding cavity is formed in the fitting along its length direction, a fitting rod is slidably installed in the sliding cavity, and the end of the fitting rod away from the fitting is rotatably connected to the second pulley.

[0019] As a further embodiment of the present invention: the guide plate is provided with multiple sets of horizontal grooves with progressively increasing heights, and two adjacent horizontal grooves are connected by an inclined groove, and a groove adapted to the second pulley is provided at the lower middle part of the horizontal groove.

[0020] Multiple sets of horizontal and inclined grooves form a guide groove, and the second pulley can roll within the guide groove.

[0021] As a further aspect of the present invention, a dust collection hood is also installed on the frame structure.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] The dust collection hood can collect harmful dust such as sulfur dioxide generated during the production of cara tubes, thereby effectively purifying the air in the factory. In addition, it can be used in conjunction with a filtration device to achieve pollution-free or low-pollution high-altitude emissions, meeting environmental protection requirements.

[0024] The height of the flame gun can be adjusted by the lifting mechanism. The stability of the flame gun's height position is improved by the threaded engagement of the lead screw and the threaded sleeve. Compared with the existing flame guns that are connected by bolts and nuts, the method proposed in this invention is obviously simpler and more convenient, and more conducive to the production of carabiners.

[0025] By incorporating telescopic plates and guide plates, external wind is prevented from blowing onto the flame gun, which could lead to insufficient concentration of the flame's burning point or even change the blue flame to a red or pink flame. This would result in insufficient heating of the kraft tube, reducing its quality. Simultaneously, as the flame gun rises, the abutment piece moves along with the arc-shaped sliding plate, causing the telescopic plate to extend outwards towards the rotating sleeve plate. This allows the telescopic plate to move synchronously with the flame gun, protecting it after its position changes and improving the stability of the flame gun's spray. Furthermore, the angle of the telescopic plates is adjustable, allowing for fine-tuning of the protective area of ​​the rotating sleeve plate and telescopic plates, resulting in superior protective effects. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of one embodiment of a kraft tube production equipment.

[0027] Figure 2 for Figure 2 A magnified schematic diagram of the structure at point A in the middle.

[0028] Figure 3 This is a schematic diagram of the lifting mechanism in one embodiment of a kraft tube production equipment.

[0029] Figure 4 This is a structural schematic diagram from another angle in one embodiment of a kraft tube production equipment.

[0030] Figure 5 for Figure 4 Enlarged schematic diagram of the structure at point B.

[0031] Figure 6 This is a schematic diagram illustrating the connection relationship between the telescopic plate and the arc-shaped sliding plate in one embodiment of a kraft tube production equipment.

[0032] Figure 7This is a schematic diagram of another angle showing the connection relationship between the telescopic plate and the arc-shaped sliding plate in one embodiment of a kraft tube production equipment.

[0033] Figure 8 An exploded view of the tilt adjustment assembly in one embodiment of a kraft tube production equipment.

[0034] Figure 9 An exploded view of a telescopic plate in one embodiment of a kraft tube production equipment.

[0035] In the diagram: 1. Frame structure; 2. Vertical plate; 3. Hysteresis groove; 4. Lead screw; 5. Slider; 6. Threaded sleeve; 7. Motor; 8. Horizontal bar; 9. Guide groove; 10. No. 1 pulley; 11. Support rod; 12. Flame gun; 13. Arc-shaped sliding plate; 14. Arc-shaped sliding groove; 15. Mounting connector; 16. Crossbar; 17. Abutment piece; 18. Rotating sleeve; 19. Telescopic plate; 20. Rotating shaft; 21. Fitting piece; 22. Fitting rod; 23. No. 2 pulley; 24. Guide plate; 25. Horizontal groove; 26. Inclined groove; 27. Groove; 28. Through groove; 29. ​​Smoke and dust collection hood. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Furthermore, elements in this invention are referred to as being "fixed to" or "set on" another element, which may be directly on the other element or may also include an intervening element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or may also include an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0038] Please see Figures 1-8 In this embodiment of the invention, a carat tube production equipment includes: a frame structure 1, a lifting mechanism, a telescopic plate, and an angle adjustment assembly.

[0039] The frame structure 1 is equipped with a dust collection hood 29. Specifically, the dust collection hood 29 is connected to an external ventilation device. By setting up the dust collection hood 29, harmful dust such as sulfur dioxide generated during the production of carbide tubes can be collected, thereby effectively purifying the air in the factory. In addition, by cooperating with a filter device (not shown in the figure), it can effectively achieve pollution-free or low-pollution high-altitude emissions, meeting environmental protection requirements.

[0040] The lifting mechanism is mounted on the frame structure 1 and connected to a flame gun 12. The lifting assembly includes a threaded adjustment assembly and a guide assembly. The guide assembly is connected to a mounting connector 15 mounted on the frame structure 1. The upper part of the mounting connector 15 has an arc-shaped structure. When the threaded adjustment assembly is activated, the guide assembly can drive the flame gun 12 to move in an arc along the mounting connector 15.

[0041] The threaded adjustment assembly includes a vertical plate 2 fixedly installed on the frame structure 1, a hysteresis groove 3 is formed in the vertical plate 2, a slider 5 is slidably installed in the hysteresis groove 3, and a lead screw 4 is rotatably installed in the hysteresis groove 3. The lead screw 4 is threadedly engaged with a threaded sleeve 6 provided in the slider 5.

[0042] The thread adjustment assembly also includes a motor 7 mounted on the vertical plate 2, and the output shaft of the motor 7 is connected to the lead screw 4;

[0043] The guide assembly includes an arc-shaped groove 14 fixedly mounted on the mounting connector 15 and an arc-shaped slide plate 13 slidably mounted in the arc-shaped groove 14. The arc-shaped slide plate 13 is fixedly connected to the flame gun 12, and the arc-shaped slide plate 13 is connected to the slider 5 through a fitting kit. The fitting kit includes a support rod 11 fixedly connected to the arc-shaped slide plate 13, and a pulley 10 is rotatably mounted at one end of the support rod 11 away from the arc-shaped slide plate 13.

[0044] The fitting kit also includes a horizontal rod 8 fixedly connected to the slider 5. The horizontal rod 8 has a guide groove 9 along its length, and the first pulley 10 can roll in the guide groove 9.

[0045] During the production of carat tubes, the carat tubes are placed on the frame structure 1. At this time, due to the different diameters of the carat tubes, it is necessary to adjust the angle of the mounting connector 15 (the mounting connector 15 is rotatably mounted on the frame structure 1). By adjusting the angle of the mounting connector 15, the arc-shaped area on the upper part of the mounting connector 15 can be made to coincide with or be close to the central axis of the carat tube to be produced. So that when the height of the flame gun 12 changes during the flame spraying process, the distance between the flame gun 12 and the outer circumference of the carat tube can be consistent or approximately the same, thereby making the heated temperature on the outer circumference of the carat tube more consistent and improving the production accuracy.

[0046] When it is necessary to heat different areas of the Krah tube or change the heating position of the Krah tube, the motor 7 is controlled to rotate. The output shaft of the motor 7 will drive the lead screw 4 connected to it to rotate. At this time, since the slider 5 is slidably set on the vertical plate 2, the slider 5 can only move in the length direction of the vertical plate 2. The threaded sleeve 6 is in a fixed connection with the slider 5, so that during the rotation of the lead screw 4, it will drive the threaded sleeve 6 to rise and fall, and also cause the slider 5 to rise and fall. Since the lead screw 4 and the threaded sleeve 6 are connected by threads, and the threaded connection has self-locking properties, the height between the threaded sleeve 6 and the slider 5 will not change when the motor 7 and the lead screw 4 stop rotating. This improves the stability of the flame gun 12 during operation, improves the uniformity of heating of the Krah tube, and improves the production quality of the Krah tube.

[0047] When slider 5 rises and falls, it drives horizontal bar 8 to rise and fall. At this time, since the arc-shaped slide plate 13 can only move within the arc-shaped slide groove 14, the arc-shaped slide plate 13 can be driven to make arc motion through pulley 10 and support rod 11. When the arc-shaped slide plate 13 makes arc motion, pulley 10 will make arc motion and slide in guide groove 9. Through the above settings, the arc-shaped slide plate 13 can be driven to make arc motion through slider 5.

[0048] With the above settings, the height of the flame gun 12 can be adjusted, and the stability of the height position of the flame gun 12 is improved by the threaded engagement between the lead screw 4 and the threaded sleeve 6. At the same time, compared with the existing flame gun 12 which is connected by bolts and nuts, the method proposed in this invention is obviously simpler and more convenient, and more conducive to the production of carabiners.

[0049] Please see Figure 6 , Figure 7 The telescopic plate is rotatably mounted on the mounting connector 15. The telescopic plate is adapted to the abutment 17 connecting the guide assembly. When the flame gun 12 makes an arc movement, the telescopic plate can be driven to extend outward.

[0050] The telescopic plate includes a rotating sleeve 18, which is connected to the mounting connector 15 via a rotating shaft 20, and a telescopic plate 19 is slidably sleeved inside the rotating sleeve 18.

[0051] A through groove 28 is provided on the side wall of the rotating sleeve plate 18. The abutting member 17 can pass through the through groove 28 and abut against the telescopic plate 19. The abutting member 17 is connected to the arc-shaped sliding plate 13 through the crossbar 16.

[0052] In the initial state, when the flame gun 12 is at its lowest height, the telescopic plate 19 is embedded in the rotating sleeve 18. In this state, the rotating sleeve 18 can block the outside wind blowing towards the flame gun 12 to prevent the outside wind from blowing towards the flame gun 12, which would cause the burning point of the flame emitted by the flame gun 12 to be insufficiently concentrated, or even change the blue flame to a red or pink flame, thereby resulting in insufficient heating temperature of the kraft tube and reducing the quality of the kraft tube. At the same time, when the height of the flame gun 12 rises, the abutment 17 will move with the arc-shaped sliding plate 13 to drive the telescopic plate 19 to extend towards the outside of the rotating sleeve 18, so that the telescopic plate 19 moves synchronously with the flame gun 12 to protect the flame gun 12 after the position changes and improve the stability of the flame gun 12 when spraying flame.

[0053] Please see Figure 5 , Figure 8 , Figure 9 The tilt adjustment component is set on the telescopic sleeve plate for adjusting the angle of the telescopic plate. A second pulley 23 is rotatably mounted on the tilt adjustment component. The second pulley 23 is in rolling cooperation with the guide plate 24 set on the mounting connector 15.

[0054] The tilt adjustment assembly includes a fitting 21 fixedly installed on the outer wall of the rotating sleeve 18. A sliding chamber is formed in the fitting 21 along its length direction. A fitting rod 22 is slidably installed in the sliding chamber. One end of the fitting rod 22 away from the fitting 21 is rotatably connected to the second pulley 23.

[0055] The guide plate 24 is provided with multiple sets of horizontal grooves 25 with progressively increasing heights. Adjacent horizontal grooves 25 are connected by inclined grooves 26, and the lower middle part of the horizontal groove 25 is provided with a groove 27 that is compatible with the second pulley 23.

[0056] Multiple sets of horizontal grooves 25 and inclined grooves 26 form guide grooves, and the second pulley 23 can roll in the guide grooves.

[0057] In use, by pulling the fitting 21, the connected second pulley 23 can be moved. When one of the horizontal grooves 25 of the second pulley 23 moves to the other horizontal groove 25, the height of the second pulley 23 will change accordingly. At this time, the fitting 21 can drive the rotating sleeve 18 to rotate at a certain angle, thereby realizing the fine adjustment of the protective area of ​​the flame gun 12 by the rotating sleeve 18 and the telescopic plate 19, so as to make the protective effect of the rotating sleeve 18 and the telescopic plate 19 better. Moreover, the second pulley 23 can be adapted to the groove 27, so that when the second pulley 23 moves into the groove 27, the position of the second pulley 23 is more stable, thereby making the position of the rotating sleeve 18 after the angle adjustment more stable, thus improving the accuracy of protection.

[0058] In summary, during the production of carat tubes, the carat tubes are placed on the frame structure 1. At this time, due to the different diameters of the carat tubes, it is necessary to adjust the angle of the mounting connector 15 (the mounting connector 15 is rotatably mounted on the frame structure 1). By adjusting the angle of the mounting connector 15, the arc-shaped area on the upper part of the mounting connector 15 can be made to coincide with or be close to the central axis of the carat tube to be produced. So that when the height of the flame gun 12 changes during the flame spraying process, the distance between the flame gun 12 and the outer circumference of the carat tube can be consistent or approximately the same, thereby making the heated temperature on the outer circumference of the carat tube more consistent and improving the production accuracy.

[0059] When it is necessary to heat different areas of the Krah tube or change the heating position of the Krah tube, the motor 7 is controlled to rotate. The output shaft of the motor 7 will drive the lead screw 4 connected to it to rotate. At this time, since the slider 5 is slidably set on the vertical plate 2, the slider 5 can only move in the length direction of the vertical plate 2. The threaded sleeve 6 is in a fixed connection with the slider 5, so that during the rotation of the lead screw 4, it will drive the threaded sleeve 6 to rise and fall, and also cause the slider 5 to rise and fall. Since the lead screw 4 and the threaded sleeve 6 are connected by threads, and the threaded connection has self-locking properties, the height between the threaded sleeve 6 and the slider 5 will not change when the motor 7 and the lead screw 4 stop rotating. This improves the stability of the flame gun 12 during operation, improves the uniformity of heating of the Krah tube, and improves the production quality of the Krah tube.

[0060] When slider 5 rises and falls, it drives horizontal bar 8 to rise and fall. At this time, since the arc-shaped slide plate 13 can only move within the arc-shaped slide groove 14, the arc-shaped slide plate 13 can be driven to make arc motion through pulley 10 and support rod 11. When the arc-shaped slide plate 13 makes arc motion, pulley 10 will make arc motion and slide in guide groove 9. Through the above settings, the arc-shaped slide plate 13 can be driven to make arc motion through slider 5.

[0061] In the initial state, when the flame gun 12 is at its lowest height, the telescopic plate 19 is embedded in the rotating sleeve 18. In this state, the rotating sleeve 18 can block the outside wind blowing towards the flame gun 12 to prevent the outside wind from blowing towards the flame gun 12, which would cause the burning point of the flame emitted by the flame gun 12 to be insufficiently concentrated, or even change the blue flame to a red or pink flame, thereby resulting in insufficient heating temperature of the kraft tube and reducing the quality of the kraft tube. At the same time, when the height of the flame gun 12 rises, the abutment 17 will move with the arc-shaped sliding plate 13 to drive the telescopic plate 19 to extend towards the outside of the rotating sleeve 18, so that the telescopic plate 19 moves synchronously with the flame gun 12 to protect the flame gun 12 after the position changes and improve the stability of the flame gun 12 when spraying flame.

[0062] In use, by pulling the fitting 21, the connected second pulley 23 can be moved. When one of the horizontal grooves 25 of the second pulley 23 moves to the other horizontal groove 25, the height of the second pulley 23 will change accordingly. At this time, the fitting 21 can drive the rotating sleeve 18 to rotate at a certain angle, thereby realizing the fine adjustment of the protective area of ​​the flame gun 12 by the rotating sleeve 18 and the telescopic plate 19, so as to make the protective effect of the rotating sleeve 18 and the telescopic plate 19 better. Moreover, the second pulley 23 can be adapted to the groove 27, so that when the second pulley 23 moves into the groove 27, the position of the second pulley 23 is more stable, thereby making the position of the rotating sleeve 18 after the angle adjustment more stable, thus improving the accuracy of protection.

[0063] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0064] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A kraft tube production equipment, characterized in that, include: Frame structure (1); A lifting mechanism is provided on the frame structure (1) and connected to a flame gun (12). The lifting mechanism includes a threaded adjustment assembly and a guide assembly. The guide assembly is connected to a mounting connector (15) installed on the frame structure (1). The upper part of the mounting connector (15) has an arc-shaped structure. When the threaded adjustment assembly is activated, the guide assembly can drive the flame gun (12) to move in an arc along the mounting connector (15). The telescopic plate is rotatably mounted on the mounting connector (15). The telescopic plate is adapted to the abutment (17) connecting the guide assembly. When the flame gun (12) makes an arc movement, the telescopic plate can be driven to extend outward. An angle adjustment assembly is used to adjust the angle of the telescopic plate. A second pulley (23) is rotatably mounted on the angle adjustment assembly. The second pulley (23) rolls in cooperation with the guide plate (24) provided on the mounting connector (15). The threaded adjustment assembly includes a vertical plate (2) fixedly installed on the frame structure (1), a hysteresis groove (3) is formed in the vertical plate (2), a slider (5) is slidably installed in the hysteresis groove (3), and a lead screw (4) is rotatably installed in the hysteresis groove (3). The lead screw (4) is threadedly engaged with a threaded sleeve (6) provided in the slider (5). The threaded adjustment assembly also includes a motor (7) mounted on the vertical plate (2), and the output shaft of the motor (7) is connected to the lead screw (4). The guide assembly includes an arc-shaped groove (14) fixedly mounted on the mounting connector (15) and an arc-shaped slide plate (13) slidably mounted in the arc-shaped groove (14). The arc-shaped slide plate (13) is fixedly connected to the flame gun (12), and the arc-shaped slide plate (13) is connected to the slider (5) through a fitting kit. The telescopic plate includes a rotating sleeve (18), which is connected to the mounting connector (15) via a rotating shaft (20), and a telescopic plate (19) is slidably sleeved inside the rotating sleeve (18). A through groove (28) is provided on the side wall of the rotating sleeve plate (18). The abutting member (17) can pass through the through groove (28) and abut against the telescopic plate (19). The abutting member (17) is connected to the arc-shaped sliding plate (13) through the crossbar (16). The tilt adjustment assembly includes a fitting (21) fixedly installed on the outer wall of the rotating sleeve (18). A sliding chamber is formed in the fitting (21) along its length direction. A fitting rod (22) is slidably installed in the sliding chamber. One end of the fitting rod (22) away from the fitting (21) is rotatably connected to the second pulley (23). The guide plate (24) is provided with multiple sets of horizontal grooves (25) with progressively increasing heights. Two adjacent horizontal grooves (25) are connected by an inclined groove (26), and the lower middle part of the horizontal groove (25) is provided with a groove (27) that is compatible with the second pulley (23). Multiple sets of the horizontal grooves (25) and inclined grooves (26) form guide grooves, and the second pulley (23) can roll in the guide grooves.

2. The kraft tube production equipment according to claim 1, characterized in that, The fitting kit includes a support rod (11) fixedly connected to the arc-shaped slide plate (13), and a pulley (10) is rotatably mounted at one end of the support rod (11) away from the arc-shaped slide plate (13). The fitting kit also includes a horizontal rod (8) fixedly connected to the slider (5), the horizontal rod (8) having a guide groove (9) along its length, and the first pulley (10) can roll in the guide groove (9).

3. The kraft tube production equipment according to claim 1, characterized in that, The frame structure (1) is also equipped with a dust collection hood (29).

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