Garment sample design and inspection device

Abstract

The invention relates to the technical field of garment fabric detection, in particular to a garment sample design inspection device which comprises a workbench and grinding wheel millstones symmetrically mounted on the workbench. The testing device further comprises a rotatable supporting disc which is installed on the workbench and located below the grinding wheel and the grinding disc, and the supporting disc is used for bearing a sample. The pressing control mechanism is arranged on the workbench, an annular plate is arranged on the pressing control mechanism, the inner diameter of the annular plate is smaller than the outer diameter of the supporting disc, and the pressing control mechanism drives the annular plate to press the sample on the supporting disc; according to the sample wear resistance testing device, the ring plate is controlled by the compression control mechanism to compress the sample, and the loading and unloading of the sample are controlled by the ejector pin, so that the circular abrasive paper with a hole in the middle and the sample need to be manually arranged on the positioning column in a sleeving manner and laid on the top surface of the supporting disc in sequence in the wear resistance testing process of the sample of the sample; and manually fixing the sample on the top surface of the supporting disc by the annular pressing frame.

Description

Technical Field

[0001] The invention relates to the technical field of clothing fabric detection, in particular to a clothing sample design inspection device. Background Art

[0002] The main purpose of garment sample design inspection is to ensure product quality and compliance with standards, among which fabric and material inspection is an important part; There is a Y522 type disc type fabric flat grinding machine in the prior art, and its working principle is as follows: the fabric sample is fixed on the working disc, and the disc rotates at a constant speed of 70r / min. There are two brackets above the disc, each of which is equipped with two grinding wheels, which can rotate on their own axes. During the test, the sample on the working disc contacts and moves relative to the two grinding wheels, and the sample is worn in multiple directions to form a wear ring. The pressure of the grinding disc on the sample can be adjusted by changing the pressure hammer on the bracket.

[0003] According to the above content and the prior art, a positioning column is generally provided on the top of the working disc. During the wear resistance test, it is necessary to manually place the circular sandpaper with a hole in the middle and the sample on the positioning column in turn and lay them on the top surface of the working disc. The sample is then locked and fixed to the top surface of the disc through an annular pressure frame. This process of fixing the sample is relatively cumbersome and cannot improve the process operation of the wear resistance test. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a clothing sample design inspection device to solve the technical problem that the process of fixing the sample is relatively cumbersome by locking the sample to the top surface of the disk through an annular pressure frame.

[0005] Based on the above purpose, the present invention provides a clothing sample design inspection device, comprising a workbench and a grinding wheel and a grinding disc symmetrically mounted on the workbench; the inspection device also comprises a supporting disc mounted on the workbench and rotatably located below the grinding wheel and a grinding disc, the supporting disc being used to support the sample; A clamping control mechanism is arranged on the workbench, the clamping control mechanism is provided with a ring plate, the inner diameter of the ring plate is smaller than the outer diameter of the supporting disc, and the clamping control mechanism drives the ring plate to clamp the sample on the supporting disc; A dust suction pipe is arranged above the ring plate; An air outlet pipe is arranged above the supporting disc; An airflow control mechanism is arranged on the workbench, and both the dust suction pipe and the air outlet pipe are connected to the airflow control mechanism.

[0006] Preferably, the top surface of the supporting disc is provided with a positioning column for controlling the position of the sandpaper and the sample; A driving rod is arranged at the bottom of the supporting disc, and the bottom end of the driving rod is rotatably mounted on the workbench through a bearing; A rotary driver is arranged inside the workbench, and the rotary driver is transmission-connected with the bottom end of the driving rod.

[0007] Preferably, the clamping control mechanism includes a guide plate, which is arranged at the bottom of the supporting disc, and the guide plate is fixedly connected to the supporting disc by bolts, and a guide rod is arranged around the bottom of the ring plate, and the guide rod penetrates the guide rod and is slidably connected thereto; A base is arranged below the supporting disc, and the bottom end of the guide rod is fixedly connected to the base; A ring frame is arranged around the supporting disc, the ring frame comprises an upper ring body and a lower ring body, the upper ring body is rotatably connected to the ring plate through a bearing, the lower ring body is rotatably connected to the base through a bearing, a limiting column is arranged on the workbench, and the lower ring body is slidably connected to the limiting column; A first linear drive is arranged inside the workbench, and an output end of the first linear drive is drivingly connected to the lower ring body.

[0008] Preferably, the pressing control mechanism further comprises an ejector pin, a pinhole is formed around the support disc, and the ejector pin passes through the pinhole and is slidably connected to the pinhole; A ring pressure piece is arranged below the supporting disc, and the outer diameter of the ring pressure piece is smaller than the inner diameter of the base. The bottom end of the ejector pin is connected to the ring pressure piece, and a spring is sleeved on the ejector pin. The two ends of the spring respectively abut against the supporting disc and the ring pressure piece. A limit plate is arranged on the top of the ejector pin. When the spring is in an extended state, the top surface of the limit plate is flush with the top surface of the supporting disc.

[0009] Preferably, a dust hood is provided on the top of the ring frame. The dust hood is in an annular structure and surrounds the supporting disc. The inner ring wall of the dust hood forms a guide channel toward the outer ring wall groove. The air inlet of the dust suction pipe is connected to the dust hood, and the outer ring wall of the dust suction pipe that passes through the dust hood is connected to the guide channel.

[0010] Preferably, an air outlet hood is provided at the air outlet of the air outlet duct, the air outlet hood is annular in structure, the bottom wall of the air outlet hood is recessed upward to form an air flow channel inside, the air outlet duct is connected to the air outlet hood, and the air outlet duct is connected to the air flow channel through the outer ring wall of the air outlet hood.

[0011] Preferably, the inspection device further comprises an air outlet control mechanism, the air outlet control mechanism comprises a stand fixedly arranged on the workbench and a cantilever thereof, a slider is arranged on the cantilever, a slide rail is arranged on the stand, the cantilever is slidably connected to the slide rail via the slider, a second linear drive is arranged on the workbench, and an output end of the second linear drive is connected to the bottom end of the cantilever; The air outlet cover is fixedly installed on the outer end of the cantilever, and the air outlet cover is coaxially arranged with the supporting disc and is located above the supporting disc.

[0012] Preferably, the airflow control mechanism includes a fan fixedly mounted on the workbench, a filter element is provided at the air inlet of the fan, the dust collecting hood is connected to the air inlet of the fan through a dust suction pipe, and the air outlet hood is connected to the air outlet of the fan through an air outlet pipe.

[0013] Beneficial effects of the present invention: The present invention controls the pressing of the sample by the ring plate through the pressing control mechanism, and controls the loading and unloading of the sample through the ejector pin, thereby realizing the operation of manually placing the circular sandpaper with a hole in the middle and the sample on the positioning column and laying them on the top surface of the supporting disc in turn during the wear resistance test of the sample clothing, and manually fixing the sample on the top surface of the supporting disc through the annular pressing frame. In addition, the arrangement of the airflow control mechanism, the dust suction pipe and the air outlet pipe effectively avoids the problem that the traditional detection device has only one dust suction port above the positioning column, which makes it difficult for fiber debris to be separated from the sample due to stickiness and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 The three-dimensional structure of the present invention is shown in FIG. Figure 1 ; Figure 2 The three-dimensional structure of the present invention is shown in FIG. Figure 2 ; Figure 3 It is a schematic diagram of the three-dimensional structure of the support disc of the present invention; Figure 4 It is a front view of the support disc of the present invention; Figure 5 A top view of the present invention; Figure 6 Figure 5 AA direction cross-sectional view; Figure 7 The three-dimensional structure of the present invention is shown in FIG. Figure 3 ; Figure 8 for Figure 7 Enlarged view of point B.

[0016] The numbers in the figure are: 1-workbench; 2-grinding wheel; 3-support disc; 31-positioning column; 32-driving rod; 33-rotating drive; 4-clamping control mechanism; 41-guide plate; 42-chassis; 43-ring frame; 44-limiting column; 45-first linear drive; 46-thimble; 47-ring pressure piece; 48-spring; 5-ring plate; 51-guide rod; 6-dust suction pipe; 61-dust hood; 7-air outlet pipe; 71-air outlet hood; 8-air flow control mechanism; 81-fan; 82-filter element; 9-air outlet control mechanism; 91-cantilever; 92-stand; 93-slide rail; 94-slider; 95-second linear drive. DETAILED DESCRIPTION

[0017] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0018] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0019] The first aspect of the present invention provides a clothing sample design inspection device, such as Figures 1 to 8 As shown, it includes a workbench 1 and a grinding wheel 2 symmetrically mounted on the workbench 1; the inspection device also includes a supporting disc 3 mounted on the workbench 1 and rotatably located below the grinding wheel 2, and the supporting disc 3 is used to support the sample; A clamping control mechanism 4 is arranged on the workbench 1, and a ring plate 5 is arranged on the clamping control mechanism 4. The inner diameter of the ring plate 5 is smaller than the outer diameter of the supporting disc 3. The clamping control mechanism 4 drives the ring plate 5 to clamp the sample on the supporting disc 3; A dust suction pipe 6 is arranged above the ring plate 5; An air outlet pipe 7 is arranged above the supporting disc 3; An airflow control mechanism 8 is arranged on the workbench 1 , and the dust suction pipe 6 and the air outlet pipe 7 are both connected to the airflow control mechanism 8 .

[0020] The top surface of the supporting disc 3 is provided with a positioning column 31 for controlling the position of the sandpaper and the sample; A driving rod 32 is provided at the bottom of the supporting disc 3, and the bottom end of the driving rod 32 is rotatably mounted on the workbench 1 through a bearing; A rotary driver 33 is disposed inside the workbench 1 , and the rotary driver 33 is drivingly connected to the bottom end of the driving rod 32 .

[0021] In this embodiment, the rotary driver 33 is specifically a servo motor, which is connected to the driving rod 32 via a synchronous pulley.

[0022] The clamping control mechanism 4 includes a guide plate 41, which is arranged at the bottom of the supporting disc 3, and the guide plate 41 is fixedly connected to the supporting disc 3 by bolts, and a guide rod 51 is arranged around the bottom of the ring plate 5, and the guide rod 51 penetrates the guide rod 51 and is slidably connected thereto; A base is arranged below the supporting disc 3, and the bottom end of the guide rod 51 is fixedly connected to the base; A ring frame 43 is arranged around the support disc 3, and the ring frame 43 includes an upper ring body and a lower ring body. The upper ring body is rotatably connected to the ring plate 5 through a bearing, and the lower ring body is rotatably connected to the base through a bearing. A limiting column 44 is arranged on the workbench 1, and the lower ring body is slidably connected to the limiting column 44; A first linear drive 45 is arranged inside the workbench 1 , and an output end of the first linear drive 45 is drivingly connected to the lower ring body.

[0023] In this embodiment, the first linear drive 45 is specifically an electric push rod but is not limited thereto.

[0024] The clamping control mechanism 4 also includes a pin 46. A pin hole is formed around the support disc 3. The pin 46 penetrates the pin hole and is slidably connected to the pin hole. A ring pressure piece 47 is arranged below the support disc 3, and the outer diameter of the ring pressure piece 47 is smaller than the inner diameter of the base. The bottom end of the ejector pin 46 is connected to the ring pressure piece 47, and a spring 48 is sleeved on the ejector pin 46. The two ends of the spring 48 respectively abut against the support disc 3 and the ring pressure piece 47. A limit plate is arranged on the top of the ejector pin 46. When the spring 48 is in an extended state, the top surface of the limit plate is flush with the top surface of the support disc 3.

[0025] When the output end of the first linear drive 45 drives the ring frame 43 to move upward, the ring frame 43 drives the ring plate 5 and the base to move with it. Since the guide rod 51 arranged at the bottom of the ring plate 5 is guided by the guide plate 41, when the supporting disc 3 rotates, the ring plate 5 will also rotate with it. When the ring pressure piece 47 is in a normal state, the spring 48 pushes the ring pressure piece 47 to the lower position, and the top of the ejector pin 46 connected to the ring pressure piece 47 will also be flush with the surface of the support disc 3. During the rising process of the base, the ring pressure piece 47 will be lifted up. The ring pressure piece 47 rises while overcoming the preload force of the spring 48, and causes the ejector pin 46 to extend so that its top end is higher than the top surface of the support disc 3.

[0026] A dust hood 61 is arranged on the top of the ring frame 43. The dust hood 61 is an annular structure that surrounds the support disc 3. The inner ring wall of the dust hood 61 forms a guide channel toward the outer ring wall groove. The air inlet of the dust suction pipe 6 is connected to the dust hood 61, and the outer ring wall of the dust suction pipe 6 that passes through the dust hood 61 is connected to the guide channel.

[0027] The sample garment is surrounded by the annular dust collecting cover 61, so that the debris generated during the grinding process of the sample garment can be prevented from being scattered on the workbench 1 and causing trouble for the staff to clean up.

[0028] An air outlet cover 71 is provided at the air outlet of the air outlet pipe 7. The air outlet cover 71 is annular in structure. The bottom wall of the air outlet cover 71 is recessed upward to form an air flow channel inside. The air outlet pipe 7 is connected to the air outlet cover 71, and the air outlet pipe 7 is connected to the outer ring wall of the air outlet cover 71 and the air flow channel.

[0029] The annular air hood 71 can avoid the positioning column 31 on the top of the supporting disk 3 when the cantilever 91 drives the air hood 71 to descend, and the outer ring wall of the air hood 71 is in a trumpet shape. The inspection device further includes an air outlet control mechanism 9, which includes a stand 92 fixedly arranged on the workbench 1 and a cantilever 91 thereof, a slider 94 being arranged on the cantilever 91, a slide rail 93 being arranged on the stand 92, the cantilever 91 being slidably connected to the slide rail 93 via the slider 94, a second linear drive 95 being arranged on the workbench 1, and an output end of the second linear drive 95 being connected to the bottom end of the cantilever 91; The air outlet cover 71 is fixedly mounted on the outer end of the cantilever 91 , and the air outlet cover 71 is coaxially arranged with the supporting disc 3 and is located above it.

[0030] The second linear drive 95 in this solution is specifically an electric push rod but is not limited to this.

[0031] The airflow control mechanism 8 includes a fan 81 fixedly mounted on the workbench 1, a filter element 82 is provided at the air inlet of the fan 81, the dust collecting hood 61 is connected to the air inlet of the fan 81 through the dust suction pipe 6, and the air outlet hood 71 is connected to the air outlet of the fan 81 through the air outlet pipe 7.

[0032] In this embodiment, in the initial state, the output shaft of the first linear drive 45 is in an extended state, the ring plate 5 is above the supporting disc 3, and the ejector pin 46 also extends out of the supporting disc 3 and the top end is higher than the top surface of the supporting disc 3. The staff puts a circular sandpaper with a hole in the middle on the positioning column 31 and lays it on the top of the ejector pin 46, and then puts a circular sample with a hole in the middle on the positioning column 31 and lays it on the top of the sandpaper; The clamping control mechanism 4 starts to work, and the first linear drive 45 drives the ring frame 43 to move downward. During the descending process of the ring frame 43, the ring plate 5 and the base will be driven to descend with it. During the descending process of the ring plate 5 and the base, due to the push of the spring 48, the ring pressing piece 47 will also move with the descending of the base. When the ring pressing piece 47 is in the lower position, the top of the ejector pin 46 connected to it will also be flush with the surface of the supporting disc 3, and the sandpaper and the sample clothing sample will also be laid on the top of the supporting disc 3. As the ring frame 43 continues to descend, it will also drive the ring plate 5 to cover the surface of the supporting disc 3 and press the sandpaper and the sample clothing sample. Then, it is necessary to prepare for the wear resistance test of the sample clothing, the rotary driver 33 starts to work, the servo motor controls the driving rod 32 to rotate through the synchronous belt, and the driving rod 32 drives the sandpaper and the sample clothing sample pressed on its top surface to rotate with it through the supporting disc circle. During the rotation process, since the guide disc 41 is fixed to the bottom of the supporting disc 3, the guide disc 41 will drive the ring plate 5 and the bottom plate 42 to continue to rotate with it through the guide rod 51 during the rotation of the supporting disc 3, so as to ensure that the ring plate 5 can always press the sample clothing sample during the rotation of the supporting disc 3. Also, because the bottom plate 42 and the ring plate 5 are both rotatably connected to the ring frame 43 through the bearing, the rotation of the ring plate 5 and the bottom plate 42 will not affect the ring frame 43. During the rotation of the supporting disc 3, the staff also put down the left grinding wheel 2 and the right grinding wheel 2 to make the grinding wheels contact with the sample clothing. The two grinding wheels are used to simulate the wear resistance of the fabric under different conditions, and the pressure of the grinding wheel on the sample can be adjusted by changing the pressure weight on the bracket. The two grinding wheels are controlled by the driving mechanism to rotate and act on the surface of the sample clothing. This is a mature existing technology and will not be described in detail. During the wear resistance test of the sample clothing, the airflow control mechanism 8 starts to collect the fiber debris generated by the wear between the grinding wheel and the sample clothing. Specifically, the fan 81 starts to work, and the fan 81 collects the debris generated by the grinding of the sample clothing surrounded by the dust collecting cover 61 through the dust suction pipe 6. At the same time, the airflow generated by the air outlet of the fan 81 acts on the surface of the sample clothing through the air outlet pipe 7 and the air outlet cover 71. The airflow blown by the air outlet cover 71 blows the fiber debris on the sample surface into the air flow channel of the dust collecting cover 61, and an effective airflow circulation process is completed in the cooperation of suction and blowing. After the sample clothing has completed the wear resistance test and needs to be taken out, the clamping control mechanism 4 starts working, and the first linear drive 45 controls the ring frame 43 to move upward. After the ring frame 43 moves upward, it will drive the ring plate 5 and the chassis 42 to move upward at the same time. After the ring plate 5 moves up, it will be released from the clamping of the sandpaper and the sample. Then, as the chassis 42 continues to rise, the chassis 42 will drive the ring pressing piece 47 to move upward. The ring pressing piece 47 rises while overcoming the preload force of the spring 48, and prompts the ejector pin 46 to extend so that its top is higher than the top surface of the supporting disc 3. The ejector pin 46 lifts the sandpaper and the sample, and the staff can smoothly remove the sample clothing from the positioning column 31 and identify its wear resistance.

[0033] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0034] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A clothing sample design inspection device, comprising a workbench (1) and a grinding wheel (2) symmetrically mounted on the workbench (1); characterized in that: The inspection device also includes a supporting disc (3) mounted on the workbench (1) and rotatably located below the grinding wheel (2), the supporting disc (3) being used to support the sample; A clamping control mechanism (4) is arranged on the workbench (1), and a ring plate (5) is arranged on the clamping control mechanism (4). The inner diameter of the ring plate (5) is smaller than the outer diameter of the supporting disc (3). The clamping control mechanism (4) drives the ring plate (5) to clamp the sample on the supporting disc (3); A dust suction pipe (6) disposed above the ring plate (5); An air outlet pipe (7) arranged above the supporting disc (3); An airflow control mechanism (8) is arranged on the workbench (1), and the dust suction pipe (6) and the air outlet pipe (7) are both connected to the airflow control mechanism (8).

2. A clothing sample design inspection device according to claim 1, characterized in that: The top surface of the supporting disc (3) is provided with a positioning column (31) for controlling the position of the sandpaper and the sample; A driving rod (32) is provided at the bottom of the supporting disc (3), and the bottom end of the driving rod (32) is rotatably mounted on the workbench (1) via a bearing; A rotary driver (33) is provided inside the workbench (1), and the rotary driver (33) is drivingly connected to the bottom end of the driving rod (32).

3. A clothing sample design inspection device according to claim 2, characterized in that: The clamping control mechanism (4) comprises a guide plate (41), the guide plate (41) being arranged at the bottom of the supporting disc (3), and the guide plate (41) and the supporting disc (3) being fixedly connected by bolts, and a guide rod (51) being arranged around the bottom of the ring plate (5), and the guide rod (51) passing through the guide rod (51) and being slidably connected thereto; A base is arranged below the supporting disc (3), the bottom end of the guide rod (51) being fixedly connected to the base; A ring frame (43) is arranged around the supporting disc (3), the ring frame (43) comprising an upper ring body and a lower ring body, the upper ring body is rotatably connected to the ring plate (5) via a bearing, and the lower ring body is rotatably connected to the base via a bearing, a limiting column (44) is arranged on the workbench (1), and the lower ring body is slidably connected to the limiting column (44); A first linear drive (45) is arranged inside the workbench (1), and an output end of the first linear drive (45) is drivingly connected to the lower ring body.

4. A clothing sample design inspection device according to claim 3, characterized in that: The clamping control mechanism (4) further comprises a pin (46), a pinhole is formed around the support disc (3), and the pin (46) passes through the pinhole and is slidably connected to the pinhole; A ring pressure piece (47) is arranged below the support disc (3), the outer diameter of the ring pressure piece (47) is smaller than the inner diameter of the base, the bottom end of the ejector pin (46) is connected to the ring pressure piece (47), a spring (48) is sleeved on the ejector pin (46), the two ends of the spring (48) respectively abut against the support disc (3) and the ring pressure piece (47), a limit plate is arranged at the top end of the ejector pin (46), and the top surface of the limit plate is flush with the top surface of the support disc (3) when the spring (48) is in an extended state.

5. A clothing sample design inspection device according to claim 3, characterized in that: A dust collecting hood (61) is arranged on the top of the ring frame (43); the dust collecting hood (61) is in an annular structure and surrounds the supporting disc (3); an inner annular wall of the dust collecting hood (61) forms a guide channel toward the outer annular wall groove; an air inlet of the dust suction pipe (6) is connected to the dust collecting hood (61); and an outer annular wall of the dust suction pipe (6) that passes through the dust collecting hood (61) is connected to the guide channel.

6. A clothing sample design inspection device according to claim 5, characterized in that: An air outlet cover (71) is provided at the air outlet of the air outlet pipe (7). The air outlet cover (71) is in an annular structure. The bottom wall of the air outlet cover (71) is recessed upwards to form an air flow channel inside the air outlet pipe (7). The air outlet pipe (7) is connected to the air outlet cover (71). The air outlet pipe (7) is connected to the outer ring wall of the air outlet cover (71) and the air flow channel.

7. A clothing sample design inspection device according to claim 6, characterized in that: The inspection device further comprises an air outlet control mechanism (9), the air outlet control mechanism (9) comprising a stand (92) fixedly arranged on the workbench (1) and a cantilever (91), a slider (94) being arranged on the cantilever (91), a slide rail (93) being arranged on the stand (92), the cantilever (91) being slidably connected to the slide rail (93) via the slider (94), a second linear drive (95) being arranged on the workbench (1), and an output end of the second linear drive (95) being connected to the bottom end of the cantilever (91); The air outlet cover (71) is fixedly mounted on the outer end of the cantilever (91), and the air outlet cover (71) is coaxially arranged with the supporting disc (3) and is located above it.

8. A clothing sample design inspection device according to claim 1, characterized in that: The airflow control mechanism (8) comprises a fan (81) fixedly mounted on the workbench (1); a filter element (82) is arranged at the air inlet of the fan (81); a dust collecting hood (61) is connected to the air inlet of the fan (81) via a dust suction pipe (6); and an air outlet hood (71) is connected to the air outlet of the fan (81) via an air outlet pipe (7).

Images