Drum-type fuel gas herbal medicine roaster with screening type material receiving mechanism

Abstract

The utility model relates to a drum-type gas herbal medicine roaster with a screening type material receiving mechanism, which comprises a herbal medicine roaster body with a material guide groove, the screening type material receiving mechanism is arranged below the material guide groove, the material receiving mechanism comprises a surrounding baffle arranged right below the material guide groove, and the back of the surrounding baffle is fixedly connected with a machine shell of the herbal medicine roaster body. A discharging opening is formed in one side surface of the feeding hopper, and a flashboard capable of being positioned and lifted is arranged at the discharging opening in a sealing manner; a mesh belt conveyor is arranged under a bottom opening of the fence plate. The mesh belt conveyor comprises a hollowed-out mesh belt, the hollowed-out mesh belt is matched with the bottom opening of the fence plate in size, and the hollowed-out mesh belt is in clearance fit with the bottom opening of the fence plate; a dust receiving box matched with the hollowed-out mesh belt is arranged in a gap in the inner side of the hollowed-out mesh belt in a penetrating mode, the dust receiving box is communicated with a centrifugal fan through a dust inlet pipe matched with the dust receiving box, and the centrifugal fan is connected with a dust collecting bag through a dust outlet pipe matched with the centrifugal fan. According to the utility model, the screening type material receiving mechanism is arranged, so that the stir-fried traditional Chinese medicinal material slices can be effectively screened and subjected to dust collection, and most mixed medicine dust can be removed.

Description

Technical Field

[0001] The utility model belongs to the technical field of traditional Chinese medicine processing equipment, and particularly relates to a drum-type gas medicine stir-frying machine with a sieve-type material receiving mechanism. Background Art

[0002] At present, in the process of traditional Chinese medicine processing, there are many steps, such as: cleaning, slicing, stir-frying, drying, detecting, packaging, etc. Among them, special medicine stir-frying machines are required for the traditional Chinese medicine that needs to be stir-fried; the existing large-scale traditional Chinese medicine stir-frying equipment usually adopts a drum-type gas medicine stir-frying machine with a large capacity. By using this equipment for stir-frying traditional Chinese medicine, not only the single stir-frying amount is increased, but also the qualified rate of the medicine is improved, and the stir-frying cost is reduced.

[0003] However, since the drum-type medicine stir-frying machine mainly stir-fries medicinal materials through high temperature and high-speed rotation, in this process, impurities, debris and some medicinal material components on the surface of the medicinal materials may volatilize or fall off due to high temperature, forming medicine dust; after the stir-frying is completed, these medicine dusts will be mixed with the traditional Chinese medicine and flow out through the material guiding groove in the medicine stir-frying machine, which will affect the quality of the later-stage medicinal material processing to a certain extent. Therefore, it is necessary to pre-clean and collect most of the medicine dust during the material discharging process to improve the quality of the later-stage medicinal material processing. Summary of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the utility model provides a drum-type gas medicine stir-frying machine with a sieve-type material receiving mechanism, and the specific technical solutions are as follows:

[0005] The utility model provides a drum-type gas medicine stir-frying machine with a sieve-type material receiving mechanism, which includes a medicine stir-frying machine body with a material guiding groove. A sieve-type material receiving mechanism is arranged below the material guiding groove. The material receiving mechanism includes a surrounding baffle plate which is arranged directly below the material guiding groove and has a "mouth" - shaped structure. The back surface of the surrounding baffle plate is fixedly connected to the machine shell of the medicine stir-frying machine body. One side surface of the surrounding baffle plate is provided with a discharge opening, and a gate plate which can be positioned and lifted is sealed at the discharge opening; a net belt conveyor is arranged directly below the bottom opening of the surrounding baffle plate;

[0006] The net belt conveyor includes driving rollers which are horizontally oppositely arranged. Both ends of the driving rollers are respectively rotationally connected with suspension rods, and the suspension rods are fixedly connected to the corresponding side surfaces of the surrounding baffle plate. A servo motor is arranged outside one of the suspension rods, and the power output end of the servo motor is axially传动连接 with the corresponding driving roller; a hollow net belt is wound and fitted between the two driving rollers. The hollow net belt is adapted to the size of the bottom opening of the surrounding baffle plate, and the two are in gap contact with each other;

[0007] A dust receiving box which is adapted to the hollow net belt is arranged inside the hollow net belt at an interval. The dust receiving box is communicated with a centrifugal fan through a dust inlet pipe which is adapted to it. The centrifugal fan is connected with a dust collection bag through a dust outlet pipe which is adapted to it.

[0008] As a preferred technical solution of this utility model, a baffle plate adapted to match is inclinedly arranged between the inner wall of the enclosure plate and the long side of the corresponding hollow mesh belt. A rubber strip is detachably riveted to the bottom edge of the baffle plate, and the bottom edge of the rubber strip is in close contact with the top surface of the long side of the corresponding hollow mesh belt.

[0009] As a preferred technical solution of this utility model, the side of the material discharge opening of the enclosure plate is vertically and symmetrically provided with a slot, and a gate plate is fitted in the slot with a gap. A positioning block is horizontally and symmetrically fixed and suspended at the top end of the gate plate. A screw rod is vertically and gaplessly inserted at the end of the positioning block. The bottom end of the screw rod is fixed to the top surface of the enclosure plate. The positioning block is positioned and clamped by two nuts screwed to the screw rod.

[0010] As a preferred technical solution of this utility model, a protrusion is integrally and vertically connected to the inner side of the top of the suspension rod, a suspension block is arranged parallel above the protrusion, and the suspension block is vertically fixed to the side of the corresponding enclosure plate. A screw rod is vertically fixed to the bottom surface of the suspension block, the screw rod passes through the protrusion with a gap, and the protrusion is positioned and clamped by two nuts on the screw rod.

[0011] As a preferred embodiment of this utility model, two support rods are vertically and symmetrically arranged on both sides of the dust collection box, and the support rods are fixed to the dust collection box by bolts that are compatible with them.

[0012] As a preferred technical solution of this utility model, the back of the enclosure plate is symmetrically welded with ear blocks at both ends, and the ear blocks are fixed to the casing of the frying machine body by bolts that are compatible with them.

[0013] As a preferred embodiment of this utility model, the dust collection bag is made of non-woven fabric.

[0014] The beneficial effects of this utility model are:

[0015] This utility model provides a screening and receiving mechanism below the feed trough of the main body of the stir-frying machine. The receiving mechanism includes a baffle plate, a mesh belt conveyor and a dust collection system, which can effectively screen and collect dust from the stir-fried Chinese medicinal materials to remove most of the mixed medicinal dust.

[0016] The perforated mesh belt is closely fitted to the bottom of the enclosure panel to ensure that when the sliced ​​Chinese medicinal herbs fall onto the perforated mesh belt, smaller dust particles can pass through the perforated part of the mesh belt and fall into the dust collection box below; the centrifugal fan is connected to the dust collection box through the dust inlet pipe, sucking in the dust and discharging it into the dust collection bag through the dust outlet pipe, realizing the centralized collection and treatment of the dust, avoiding most of the dust from mixing with the Chinese medicinal herbs, and improving the processing quality of the medicinal herbs in the later stages;

[0017] The baffle is in a "square" - shaped structure and is fixedly connected to the main body of the Chinese medicine frying machine at the back. A gate plate that can be positioned and lifted is arranged on one side. Such a design can adjust the distance between the gate plate and the hollow mesh belt according to the size of the sliced Chinese medicinal materials, so as to ensure that the well - fried sliced Chinese medicinal materials can be smoothly conveyed and discharged along with the hollow mesh belt;

[0018] The mesh belt conveyor is driven by a servo motor, which can achieve precise speed control and adjust the conveying speed according to the different characteristics of the fried Chinese medicinal materials to meet different production requirements. Brief Description of the Drawings

[0019] Figure 1 Shows the overall structural schematic diagram of the present utility model;

[0020] Figure 2 Shows the structural schematic diagram of the sieve - type material receiving mechanism in the present utility model;

[0021] Figure 3 Shows Figure 2 The enlarged structural view of part A in

[0022] Figure 4 Shows Figure 2 The enlarged structural view of part B in

[0023] Figure 5 Shows the structural schematic diagram of the sieve - type material receiving mechanism without the baffle assembled in the present utility model;

[0024] Figure 6 Shows the structural schematic diagram of the assembly of the dust - collecting box and the centrifugal fan in the present utility model.

[0025] As shown in the figure: 1. Main body of the Chinese medicine frying machine; 11. Material guiding groove; 2. Baffle; 21. Gate plate; 211. Card slot; 212. Positioning block; 213. First screw; 214. First nut; 22. Material blocking plate; 221. Rubber belt; 23. Ear block; 3. Mesh belt conveyor; 31. Driving roller; 32. Suspension rod; 321. Convex block; 322. Hanging block; 323. Second screw; 324. Second nut; 33. Hollow mesh belt; 34. Servo motor; 4. Dust - collecting box; 41. Support rod; 5. Centrifugal fan; 51. Dust - inlet pipe; 52. Dust - outlet pipe; 6. Dust - collecting bag. Detailed Description of the Embodiment

[0026] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the following further details the present utility model in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0027] Embodiment 1

[0028] To solve the technical problems in the background art, the following drum-type gas medicine stir-frying machine with a sieve-type material receiving mechanism is provided:

[0029] Combined with Figure 1 and Figure 2 As shown, the drum-type gas medicine stir-frying machine with a sieve-type material receiving mechanism includes a medicine stir-frying machine body 1 having a material guiding groove 11. A sieve-type material receiving mechanism is provided below the material guiding groove 11. The material receiving mechanism includes a surrounding baffle 2 arranged directly below the material guiding groove 11 and having a "mouth" shape structure. The back surface of the surrounding baffle 2 is fixedly connected to the casing of the medicine stir-frying machine body 1. An outlet opening is provided on one side surface of the surrounding baffle 2, and a gate plate 21 that can be positioned and lifted is sealed at the outlet opening. A net belt conveyor 3 is provided directly below the bottom opening of the surrounding baffle 2;

[0030] The net belt conveyor 3 includes driving rollers 31 arranged horizontally opposite to each other. Suspension rods 32 are respectively rotatably connected to both ends of the driving rollers 31, and the suspension rods 32 are fixedly connected to the corresponding side surface of the surrounding baffle 2. A servo motor 34 is provided outside one of the suspension rods 32, and the power output end of the servo motor 34 is axially drivingly connected to the corresponding driving roller 31. A hollow net belt 33 is wound and fitted between the two driving rollers 31. The hollow net belt 33 is adapted to the size of the bottom opening of the surrounding baffle 2, and the two are in clearance contact with each other;

[0031] A dust collecting box 4 is arranged in the hollow net belt 33 at an inner clearance. The dust collecting box 4 is connected to a centrifugal fan 5 through a dust inlet pipe 51 adapted to it. The centrifugal fan 5 is connected to a dust collecting bag 6 through a dust outlet pipe 52 adapted to it.

[0032] By adopting the above technical solution, the drum-type gas medicine stir-frying machine can effectively screen and vacuum the cut Chinese medicinal materials after frying by arranging a sieve-type material receiving mechanism below the material guiding groove 11 of the medicine stir-frying machine body 1. The material receiving mechanism includes a surrounding baffle 2, a net belt conveyor 3 and a dust collection system, so as to remove most of the mixed medicine dust;

[0033] The hollow net belt 33 is in clearance contact with the bottom opening of the surrounding baffle 2, ensuring that when the cut Chinese medicinal materials fall onto the hollow net belt 33, smaller medicine dust particles can fall into the dust collecting box 4 below through the hollow part of the hollow net belt 33. The centrifugal fan 5 is connected to the dust collecting box 4 through the dust inlet pipe 51, sucks in the medicine dust and discharges it into the dust collecting bag 6 through the dust outlet pipe 52, realizing the centralized collection and treatment of the medicine dust, avoiding the mixing of most of the medicine dust with the Chinese medicinal materials, and improving the processing quality of the later-stage medicinal materials;

[0034] The surrounding baffle 2 has a "mouth" shape structure, and the back surface is fixedly connected to the medicine stir-frying machine body 1. A gate plate 21 that can be positioned and lifted is provided on one side surface. Such a design can adjust the distance between the gate plate 21 and the hollow net belt 33 according to the size of the cut Chinese medicinal materials, so as to ensure that the fried cut Chinese medicinal materials can be smoothly conveyed and discharged along with the hollow net belt 33;

[0035] The mesh belt conveyor 3 is driven by a servo motor 34, which can achieve precise speed control and adjust the conveying speed according to the different characteristics of the medicinal materials to meet different production needs.

[0036] like Figure 1 and Figure 2 As shown, a baffle plate 22 is inclinedly provided between the inner wall of the enclosure plate 2 and the long side of the corresponding hollow mesh belt 33, and a rubber strip 221 is detachably riveted to the bottom edge of the baffle plate 22. The bottom edge of the rubber strip 221 is in close contact with the top surface of the long side of the corresponding hollow mesh belt 33.

[0037] By adopting the above technical solution, the baffle plate 22 is inclinedly set between the inner wall of the baffle plate 2 and the long side of the hollow mesh belt 33, forming an effective blocking surface; when the Chinese herbal medicine slices fall from the guide chute 11 of the stir-frying machine body 1 into the screening receiving mechanism, the baffle plate 22 can prevent the herbs from falling directly to the outside of the hollow mesh belt 33 due to inertia or wind force, thereby ensuring that the Chinese herbal medicine slices can fall orderly on the hollow mesh belt 33 for screening and dust collection;

[0038] The combined design of baffle plate 22 and rubber belt 221 also helps to reduce the flying of medicinal dust; baffle plate 22 can block some of the medicinal dust from flying directly out of the material placement space formed by baffle plate 2 and hollow mesh belt 33, while the tight fit of rubber belt 221 can further reduce the possibility of medicinal dust escaping through gaps, thereby reducing the impact of medicinal dust on the production environment and the quality of subsequent medicinal material processing.

[0039] The rubber belt 221 is connected to the bottom edge of the baffle plate 22 by a detachable riveting method. This design allows the rubber belt 221 to be easily replaced when it is worn or aged, without having to replace the entire baffle plate 22. This not only reduces maintenance costs but also improves the maintainability and service life of the equipment.

[0040] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, two support rods 41 are vertically and symmetrically arranged on both sides of the dust collection box 4, and the support rods 41 are fixed to the dust collection box 4 by bolts that are compatible with them.

[0041] By adopting the above technical solution, the support rod 41 is vertically and symmetrically arranged on both sides of the dust collection box 4 and fixed to the dust collection box 4 by bolts, providing stable support for the dust collection box 4;

[0042] The support rod 41 and the dust collection box 4 are fixed together by bolts. This connection method is not only firm and reliable, but also easy to install and disassemble.

[0043] like Figure 1 and Figure 2 As shown, ear blocks 23 are symmetrically welded to both ends of the back of the enclosure plate 2. The ear blocks 23 are fixed to the casing of the frying machine body 1 by bolts that are compatible with them.

[0044] By adopting the above technical solution, the ear block 23 is welded to both ends of the back of the baffle plate 2 and fixed to the casing of the frying machine body 1 by bolts. This connection method is not only firm and reliable, but also easy to install and disassemble.

[0045] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the dust collection bag 6 is made of non-woven fabric.

[0046] By adopting the above technical solution, the dust collection bag 6 is made of non-woven fabric material. This is because non-woven fabric material has good filtration performance, and its fiber structure can effectively capture and retain tiny drug dust particles. Under the action of the centrifugal fan 5, the drug dust is sucked into the dust collection bag 6 through the dust inlet pipe 51 and filtered by the dust collection bag 6. Most of the drug dust is trapped inside the dust collection bag 6, while clean air is discharged through the fiber gaps of the dust collection bag 6, thus achieving efficient collection and filtration of drug dust.

[0047] Example 2

[0048] Combination Figure 3 and Figure 4 As shown, based on the above embodiments, this embodiment further provides the following:

[0049] In this embodiment, as Figure 4 As shown, the side of the discharge opening of the enclosure plate 2 is vertically and symmetrically provided with a slot 211. A gate plate 21 is fitted in the slot 211 with a gap. A positioning block 212 is horizontally and symmetrically fixed to the top end of the gate plate 21. A screw 213 is vertically and gaplessly inserted at the end of the positioning block 212. The bottom end of the screw 213 is fixed to the top surface of the enclosure plate 2. The positioning block 212 is positioned and clamped by two nuts 214 screwed to the screw 213.

[0050] By adopting the above technical solution, the slots 211 are vertically and symmetrically opened on the side of the discharge opening of the baffle plate 2, providing a precise insertion and positioning space for the gate plate 21.

[0051] The positioning block 212 is horizontally symmetrically fixed at the end of the top surface of the gate plate 21 and is fixedly connected to the top surface of the baffle 2 through the first screw 213, forming a stable lifting mechanism; when it is necessary to adjust the height of the gate plate 21 according to the slice particle sizes of different types of Chinese medicinal materials, only need to loosen the first nut 214, adjust the position of the gate plate 21 on the first screw 213, and then tighten the first nut 214 again. This design makes the lifting adjustment of the gate plate 21 simple and fast, and the positioning is accurate.

[0052] As Figure 3 shown, an inner side of the top end of the suspension rod 32 is integrally and vertically connected with a convex block 321. A suspension block 322 is arranged in parallel directly above the convex block 321, and the suspension block 322 is vertically and fixedly connected to the side surface of the corresponding baffle 2. A second screw 323 is vertically and fixedly connected to the bottom surface of the suspension block 322. The second screw 323 passes through the convex block 321 with a clearance, and the convex block 321 is connected with the two second nuts 324 screwed onto the second screw 323 through upper and lower positioning clamping.

[0053] By adopting the above technical solution, the matching design of the convex block 321 and the suspension block 322 connects the suspension rod 32 and the side surface of the baffle 2 more firmly through the upper and lower positioning clamping connection of the second screw 323 and the second nuts 324;

[0054] The design of the convex block 321 and the suspension block 322 makes the installation and disassembly of the suspension rod 32 simple and fast; only need to align the convex block 321 with the second screw 323 and pass through it, and then use the second nuts 324 for upper and lower positioning clamping. This design not only improves the installation efficiency, but also facilitates the disassembly operation during equipment maintenance or component replacement;

[0055] By adjusting the position of the second nuts 324 on the second screw 323, the height of the suspension rod 32 can be finely adjusted, so as to adjust the distance between the hollow mesh belt 33 and the bottom opening of the baffle 2.

[0056] The working principle and usage process of the present utility model:

[0057] When the present utility model is in use, the Chinese medicinal material slices are first fried by the frying machine body 1 and then discharged from the material guiding groove 11 of the frying machine body 1; at this time, the screening type material receiving mechanism starts to play a role;

[0058] The Chinese medicinal material slices fall into the baffle 2 with a "mouth" - shaped structure, and the baffle 2 effectively prevents the Chinese medicinal material slices from scattering; an outlet opening is arranged on one side surface of the baffle 2, and a position - adjustable lifting gate plate 21 is sealed at the outlet opening; after frying is completed, the gate plate 21 can be lifted or lowered as needed to adapt to the outflow and blanking of different types of Chinese medicinal material slices along the hollow mesh belt 33.

[0059] During the transport of sliced ​​Chinese medicinal herbs, the dust collection box 4 inside the perforated mesh belt 33 begins to collect the medicinal dust that falls off the slices. The dust collection box 4 is connected to the centrifugal fan 5 through the dust inlet pipe 51. The suction force generated by the centrifugal fan 5 draws in the medicinal dust and discharges it into the dust collection bag 6 through the dust outlet pipe 52. The dust collection bag 6 is made of non-woven fabric and has good filtration and collection effects.

[0060] To further improve the screening effect, a baffle plate 22 is inclinedly installed between the inner wall of the baffle plate 2 and the long side of the perforated mesh belt 33. This baffle plate can effectively prevent the Chinese medicinal material slices from overflowing during the conveying process. The detachable riveted rubber strip 221 at the bottom edge of the baffle plate 22 further enhances the baffle effect and is closely attached to the top surface of the perforated mesh belt 33, reducing the leakage of Chinese medicinal material slices.

[0061] Throughout the operation, the operator can adjust the height of the gate 21 and the speed of the servo motor 34 as needed to control the outflow speed and conveying efficiency of the medicinal materials; at the same time, the dust collection bag 6 can be replaced or cleaned regularly to ensure the continuous and efficient operation of the equipment.

[0062] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A drum-type gas medicine roaster with a screening type material receiving mechanism, comprising a medicine roaster body (1) with a material guide groove (11), characterized in that: The guide chute (11) is provided below with a screening type material receiving mechanism, which comprises a surrounding baffle (2) provided directly below the guide chute (11) and in a "mouth" shaped structure, the back of the surrounding baffle (2) is fixed to the machine shell of the herbal medicine roaster (1), one side of the surrounding baffle (2) is provided with a discharge opening, and a gate (21) capable of being positioned and lifted is arranged at the discharge opening; a mesh belt conveyor (3) is arranged directly below the bottom opening of the surrounding baffle (2). The mesh belt conveyor (3) comprises horizontally opposite transmission rollers (31), the two ends of the transmission roller (31) are respectively rotatably connected with suspension rods (32), and the suspension rods (32) are fixed to the corresponding side surface of the surrounding baffle (2); one of the suspension rods (32) is externally provided with a servo motor (34), and the power output end of the servo motor (34) is axially connected with the corresponding transmission roller (31); a hollow mesh belt (33) is wound and connected between the two transmission rollers (31), the size of the hollow mesh belt (33) is matched with the bottom opening of the surrounding baffle (2), and the two are gap-connected with each other. A dust receiving box (4) matched with the hollow mesh belt (33) is gap-connected to the inner side of the hollow mesh belt (33), the dust receiving box (4) is communicated with a centrifugal fan (5) through a dust inlet pipe (51) matched therewith, and the centrifugal fan (5) is connected with a dust collecting bag (6) through a dust outlet pipe (52) matched therewith.

2. The roller-type gas herbal roaster having a sieve-type material receiving mechanism according to claim 1, characterized in that: An inclined material blocking plate (22) matched with the surrounding baffle (2) and the long edge part of the hollow mesh belt (33) is arranged between the inner wall of the surrounding baffle (2) and the long edge part of the hollow mesh belt (33), a rubber belt (221) is detachably riveted and connected to the bottom edge of the material blocking plate (22), and the bottom edge of the rubber belt (221) is gap-connected with the top surface of the long edge part of the hollow mesh belt (33).

3. The roller-type gas herbal roaster having a sieve-type material receiving mechanism according to claim 1, characterized in that: A clamping groove (211) is vertically and symmetrically arranged on the side surface of the discharge opening of the surrounding baffle (2), the gate (21) is gap-connected in the clamping groove (211), the top end of the gate (21) is horizontally and symmetrically fixed with a positioning block (212), a screw rod (213) is vertically and gap-connected to the end of the positioning block (212), the bottom end of the screw rod (213) is fixed to the top surface of the surrounding baffle (2), and the positioning block (212) is up and down positioned and clamped by two nuts (214) screwed on the screw rod (213).

4. The roller-type gas herbal roaster having a sieve-type material receiving mechanism according to claim 3, characterized in that: A protruding block (321) is vertically and integrally connected to the inner side of the top end of the suspension rod (32), a suspension block (322) is parallelly arranged above the protruding block (321), the suspension block (322) is vertically fixed to the side surface of the corresponding surrounding baffle (2), a screw rod (323) is vertically fixed to the bottom surface of the suspension block (322), the screw rod (323) gap-penetrates the protruding block (321), and the protruding block (321) is up and down positioned and clamped by two nuts (324) screwed on the screw rod (323).

5. The roller-type gas herbal roaster having a sieve-type material receiving mechanism according to claim 2, characterized in that: Two supporting rods (41) are vertically and symmetrically arranged on the two side surfaces of the dust receiving box (4), and the supporting rods (41) are fixed to the dust receiving box (4) by bolts matched therewith.

6. The roller-type gas herbal roaster having a sieve-type material receiving mechanism according to claim 1, characterized in that: The back of the fence plate (2) is symmetrically welded with lug blocks (23) at both ends, and the lug blocks (23) are fixed to the shell of the medicine roasting machine (1) through bolts.

7. The drum-type gas herbal roaster having a screening type material receiving mechanism according to any one of claims 1 to 6, characterized in that: The dust collecting bag (6) is made of non-woven fabric.

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