Dust removal device for sandblasting machine

Abstract

The present invention provides a dust removal device for a sandblasting machine, comprising a dust collecting box, a drainage pipe and a swirl pipe; the dust collecting box is used to collect sand dust generated by the sandblasting machine, the drainage pipe is used to separate sand dust and air in the dust-containing airflow; the drainage pipe comprises a drainage inner pipe and a dust collecting outer pipe, both ends of which extend into the dust collecting box, a positive pressure air gap is left between the drainage inner pipe and the dust collecting outer pipe, and the positive pressure airflow can cause the dust-containing airflow at the air inlet to settle to the bottom of the dust collecting box; the drainage inner pipe is connected to a negative pressure fan, and the airflow direction in the drainage inner pipe is opposite to that in the positive pressure air gap; the swirl pipe is used to assist in separating sand dust and air, the swirl pipe extends into the drainage inner pipe, and the airflow direction in the swirl pipe is the same as that in the positive pressure air gap; a swirl sheet is fixed on the outer wall of the swirl pipe, and the swirl pipe can be driven to rotate by a rotary drive mechanism. The present invention can solve the problem of poor workshop environment caused by dust during the sandblasting process of the sandblasting machine.

Description

Technical Field

[0001] The invention belongs to the technical field of sandblasting dust removal, and in particular relates to a dust removal device for a sandblasting machine. Background Art

[0002] The sand blasting machine uses compressed air to transport sand in a pipe, converting the kinetic energy of the sand into potential energy. During this process, the high-speed moving sand scours the surface of the object, removes the oxide layer on the metal surface, and improves the surface quality of the object.

[0003] The sandblasting process of the sandblasting machine will produce a lot of debris and sand dust. The dust is large and fills the entire production environment of the sandblasting section. In order to promote the clean production of production-oriented enterprises and the continuous improvement of the company's own requirements for environmental protection and clean production, the original production environment of the workshop sandblasting section can no longer meet the company's development requirements. In view of this situation, it is necessary to configure a dust removal device for the sandblasting machine to filter the dust in the dusty air generated by sandblasting and separate and treat it in a centralized manner. Summary of the invention

[0004] The purpose of the present invention is to provide a dust removal device for a sandblasting machine to solve the problem of poor workshop environment caused by dust during the sandblasting process of the sandblasting machine.

[0005] The present invention provides the following technical solutions:

[0006] A dust removal device for a sandblasting machine, comprising a dust collecting box, a drainage pipe and a cyclone pipe;

[0007] The dust collecting box is used to collect sand and dust generated by the sand blasting machine, and the dust-containing airflow containing sand and dust can be drawn into the dust collecting box through the air inlet of the dust collecting box by the induced draft fan;

[0008] The drainage pipe is used to separate sand and dust from air in the dust-laden airflow and drain the air out of the dust collecting box; the drainage pipe comprises an inner drainage pipe and an outer dust collecting pipe which are arranged in sequence from the inside to the outside, the ends of the inner drainage pipe and the outer dust collecting pipe both extend into the dust collecting box, an annular positive-pressure air gap is left between the inner drainage pipe and the outer dust collecting pipe, the positive-pressure air gap is connected to the air inlet, and the positive-pressure airflow in the positive-pressure air gap can cause the dust-laden airflow at the air inlet to settle to the bottom of the dust collecting box; the other end of the inner drainage pipe is connected to a negative-pressure fan, and the airflow direction in the inner drainage pipe is opposite to that in the positive-pressure air gap;

[0009] The swirl tube is used to assist in separating sand and dust from air. One end of the swirl tube is connected to an air compressor, and the other end of the swirl tube extends into the drainage inner tube. The swirl tube has the same airflow direction as the positive pressure wind gap, and a spiral swirl sheet is axially fixed on the outer wall of the swirl tube; a rotation drive mechanism is installed on the upper side of the swirl tube, and the rotation drive mechanism can drive the swirl tube to rotate.

[0010] Preferably, the drainage inner tube includes a vertically connected centrifugal separation portion and a fine sand outlet portion, the centrifugal separation portion is coaxial with the cyclone tube, the cyclone plates of the cyclone tube can perform secondary centrifugal separation on the dust-laden airflow after pre-separation in the positive pressure wind gap, and the fine sand outlet portion is connected to a fine sand collection box.

[0011] Preferably, the lower end of the cyclone tube extends out of the drainage inner tube, and the cyclone sheet extends upward from the lower side of the cyclone tube to the centrifugal separation portion of the drainage inner tube.

[0012] Preferably, the outer diameter of the swirl blades gradually decreases from bottom to top, and the blade spacing of the swirl blades also gradually decreases from bottom to top.

[0013] Preferably, the lower sides of the inner drainage tube and the outer dust collecting tube are both truncated cone-shaped and gradually taper from top to bottom, and the bottom end of the inner drainage tube extends to below the air inlet of the dust collecting box.

[0014] Furthermore, a HEPA filter is installed on the upper side of the drainage inner tube.

[0015] Preferably, the negative pressure fan is installed on the top wall of the drainage inner tube through a pipeline.

[0016] Furthermore, a three-way regulating valve is installed on the air outlet duct of the negative pressure fan, one end of the three-way regulating valve is connected to the exhaust duct, and the other end is connected to the return air duct, and the return air duct is connected to the positive pressure air gap.

[0017] Preferably, the connection between the return air duct and the positive pressure air gap is located above the air inlet of the dust collecting box.

[0018] Furthermore, the rotary drive mechanism includes a driving motor, a driving bevel gear and a driven bevel gear, the driving motor is horizontally installed on the top of the drainage inner tube, the driving bevel gear is connected to the output shaft of the driving motor, the driven bevel gear is installed on the vortex tube, and the driven bevel gear meshes with the driving bevel gear.

[0019] The beneficial effects of the present invention are:

[0020] The present invention is used to collect and separate the debris and dust generated in the process of sandblasting and grinding the surface of a workpiece. The dust collecting box of the present invention is connected to a drainage pipe, and the drainage pipe includes a drainage inner pipe and a dust collecting outer pipe. The airflow in the positive pressure air gap between the drainage inner pipe and the dust collecting outer pipe pre-separates the dust-containing airflow entering from the air inlet, and blows most of the sand and dust with larger particle sizes into the bottom of the dust collecting box; the negative pressure airflow in the drainage inner pipe sucks the pre-separated light dust-containing airflow into the drainage inner pipe, and the vortex tube in the drainage inner pipe can rotate at high speed to generate centrifugal force for the dust-containing airflow, and throws the light fine sand out of the drainage inner pipe, so as to perform secondary dust removal on the dust-containing airflow.

[0021] The device can efficiently separate sand and dust in the sandblasting process and improve the production environment of the workshop through the arrangement of multiple mutually reverse airflow chambers and cyclone tubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 It is a schematic diagram of the internal structure of the present invention.

[0024] The markings in the figure are:

[0025] 100. Dust collection box; 101. Air inlet; 102. Guide plate; 103. Box door;

[0026] 200. Drainage pipe; 210. Drainage inner pipe; 211. Centrifugal separation part; 212. Fine sand outlet; 220. Dust collection outer pipe; 230. Positive pressure air gap; 240. HEPA filter;

[0027] 300. swirl tube; 310. swirl blade; 320. rotation drive mechanism; 321. drive motor; 322. driving bevel gear; 323. driven bevel gear;

[0028] 400. Negative pressure fan;

[0029] 500. Fine sand collection box;

[0030] 600. Three-way regulating valve;

[0031] 700. Exhaust duct;

[0032] 800. Return air duct. DETAILED DESCRIPTION

[0033] like Figure 1 As shown, a dust removal device for a sandblasting machine includes a dust collecting box 100, a drainage pipe 200 and a cyclone pipe 300.

[0034] The dust collecting box 100 is used to collect sand and dust generated by the sandblasting machine. An induced draft fan and an air duct are installed on the sandblasting machine. The dust-laden airflow in the sandblasting machine can be drawn into the dust collecting box 100 by the induced draft fan through the air inlet 101 of the dust collecting box.

[0035] The drainage pipe 200 is used to separate the sand and dust from the dust-laden airflow, and introduce the sand and dust into the dust box 100 or the fine sand collection box 500, and drain the clean air out of the dust box 100. The drainage pipe 200 includes a drainage inner pipe 210 and a dust collection outer pipe 220 arranged from the inside to the outside, and the lower ends of the drainage inner pipe 210 and the dust collection outer pipe 220 are both extended into the dust box 100. An annular positive pressure air gap 230 is left between the drainage inner pipe 210 and the dust collection outer pipe 220, and the positive pressure air gap 230 is connected to the air inlet 101. The positive pressure airflow is passed into the positive pressure air gap 230, and part of the dust-laden airflow entering from the air inlet 101 swirls upward around the drainage inner pipe 210, and the positive pressure airflow pushes the dust-laden airflow to settle to the bottom of the dust box, thereby pre-separating the sand and dust with larger particle sizes and sinking them to the bottom of the dust box. The bottom of the dust box 100 is provided with an inclined guide plate 102 to guide the sand and dust out of the dust box 100. The bottom of the dust box 100 is provided with a box door 103, which is sealed between the box door 103 and the dust box, and the box door 103 can be opened regularly to clean the sand and dust.

[0036] The other end of the drainage inner tube 300 is connected to the negative pressure fan 400, and the airflow direction in the drainage inner tube 300 is opposite to the airflow direction in the positive pressure air gap 230. Specifically in this embodiment, the airflow direction in the drainage inner tube 300 is upward, and the light dust-laden airflow after pre-separation is sucked upward to facilitate secondary separation.

[0037] The cyclone tube 300 cooperates with the drainage inner tube 210 to perform secondary dust removal on the dust-containing airflow after pre-separation. A spiral cyclone sheet 310 is axially fixed on the outer wall of the cyclone tube 300, and a rotary drive mechanism 320 is installed on the upper side of the cyclone tube 300. The rotary drive mechanism 320 can drive the cyclone tube 300 to rotate, so that the dust-containing airflow after pre-separation moves around the cyclone sheet 310 at a high speed. At this time, due to the density difference between the fine sand and the air, the fine sand and the air have a large flow rate difference, so that the fine sand and the air are separated, which is convenient for throwing out the fine sand with a smaller particle size, thereby achieving secondary dust removal. Correspondingly, the drainage inner tube 210 includes a vertically connected centrifugal separation part 211 and a fine sand outlet part 212. The centrifugal separation part 211 is located near the lower side of the drainage inner tube, and the centrifugal separation part 211 is coaxial with the cyclone tube 300; the fine sand outlet part 212 is connected to the fine sand collection box 500. When the swirl blade 310 centrifugally separates the dust-laden airflow, the fine sand flowing in a high-speed spiral flow is automatically discharged from the fine sand outlet portion 212 and enters the fine sand collecting box 500, while the lighter air continues to flow upward to achieve secondary dust removal.

[0038] Specifically, the rotation drive mechanism 320 of the swirl tube includes a driving motor 321, a driving bevel gear 322 and a driven bevel gear 323. The driving motor 321 is horizontally installed on the top of the drainage inner tube 210, the driving bevel gear 322 is connected to the output shaft of the driving motor 321, the driven bevel gear 323 is installed on the swirl tube 300 and is key-connected to the swirl tube 300, and the driven bevel gear 323 engages with the driving bevel gear 322. When working, the driving motor 321 drives the driving bevel gear 322 to rotate, the driving bevel gear 322 drives the driven bevel gear 323 to rotate, and the driven bevel gear 323 drives the swirl tube 300 to rotate.

[0039] The upper end of the cyclone 300 is connected to the air compressor, and its lower side extends into the drainage inner tube 210 and then continues to extend downward until it extends out of the drainage inner tube 210. The airflow in the cyclone 300 is in the same direction as the airflow in the positive pressure air gap 230, that is, they both flow downward. The compressed air in the cyclone 300 can assist the positive pressure air gap to press the sand and dust with larger particle sizes into the bottom of the dust box 100, so as to prevent the sand and dust in the dust box 100 from being turbulent up and down due to the centrifugal force generated by the rotation of the cyclone 300. The pressure of the compressed air can be appropriately adjusted so that the sand and dust with large particle sizes can be smoothly pushed onto the guide plate, and the air containing light sand and dust is reversely sucked into the drainage inner tube 210 by the negative pressure fan for secondary separation.

[0040] The swirl plate 310 extends upward from the lower side of the swirl tube 300 to the centrifugal separation part 211 of the drainage inner tube 210. The outer diameter of the swirl plate 310 gradually decreases from bottom to top, and the plate spacing of the swirl plate 310 also gradually decreases from bottom to top. When the swirl tube 300 rotates at high speed, the swirl plate 310 can suck the dust-laden airflow after pre-separation into the drainage inner tube 210 in a spiral shape, and perform high-speed centrifugal motion in the drainage inner tube 210 to separate fine sand from air. The outer diameter of the swirl plate 310 gradually decreases from bottom to top, which is conducive to the effective separation of fine sand from air. The plate spacing of the swirl plate 310 also gradually decreases from bottom to top, which can accelerate the centrifugal separation speed of the dust-laden airflow.

[0041] The lower sides of the inner drainage tube 210 and the outer dust collecting tube 220 are both frustum-shaped and taper from top to bottom. The bottom end of the inner drainage tube 210 extends to below the air inlet 101 of the dust collecting box 100, so that the positive pressure air gap 230 intersects with the dust-laden airflow entering from the air inlet 101, and then guides the dust-laden airflow to flow downward, thereby improving the diversion effect.

[0042] A HEPA filter 240 is installed on the upper side of the drainage inner tube 210. The HEPA filter 240 efficiently filters the particles in the air after the secondary separation to obtain clean air.

[0043] The negative pressure fan 400 is connected to the top wall of the drainage inner tube 210 through a pipeline, and a three-way regulating valve 600 is installed on the air outlet duct of the negative pressure fan 400. One end of the three-way regulating valve 600 is connected to the exhaust duct 700, and the other end is connected to the return duct 800. The return duct 800 is connected to the positive pressure air gap 230, and the connection between the return duct 800 and the positive pressure air gap 230 is located above the air inlet 101 of the dust box. By adjusting the three-way regulating valve 600, part of the clean air can be discharged into the positive pressure air gap 230 to generate a positive pressure airflow, which reduces the use of positive pressure generating equipment and saves equipment costs.

[0044] The working process of the device is as follows: when the sandblasting machine is working, the induced draft fan draws sand and dust from the air inlet 101 of the dust collecting box into the dust collecting outer tube 220, and the dust-containing airflow swirls around the outer wall of the drainage inner tube 210. The positive pressure in the positive pressure air gap 230 presses the dust-containing airflow downward, causing the heavy sand and dust with larger particle size to fall into the bottom of the dust collecting box 100. At the same time, compressed air is introduced into the cyclone 300 to assist the positive pressure air gap in pre-separating the heavy sand and dust in the dust-containing airflow. The airflow containing light sand and dust after pre-separation is lifted upward by the negative pressure fan 400, and at the same time, the rotary drive mechanism 320 works to drive the cyclone 300 to rotate at high speed, so that the airflow is lifted spirally to generate centrifugal force, and the fine sand and air are separated for the second time. The separated fine sand is automatically discharged from the fine sand outlet and enters the fine sand collection box 500, while the lighter air continues to flow upward and is efficiently filtered by the HEPA filter 240 to obtain clean air, which is discharged from the top of the drainage inner tube 210. Part of the air passes through the three-way regulating valve 600 and enters the positive pressure air gap 230 for reuse. The dust box 100 and the fine sand collection box 500 can be cleaned regularly. The cleaning efficiency of the device can reach more than 97%.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A dust removal device for a sandblasting machine, characterized in that: It includes a dust collecting box, a drainage pipe and a swirl pipe; The dust collecting box is used to collect sand and dust generated by the sandblasting machine, and the dust-containing airflow can be drawn into the dust collecting box through the air inlet of the dust collecting box; The drainage pipe is used to separate sand and dust from air in the dust-laden airflow; the drainage pipe comprises an inner drainage pipe and an outer dust-collecting pipe arranged in sequence from the inside to the outside, the ends of the inner drainage pipe and the outer dust-collecting pipe both extend into the dust-collecting box, a positive-pressure air gap is left between the inner drainage pipe and the outer dust-collecting pipe, and the positive-pressure airflow in the positive-pressure air gap can cause the dust-laden airflow at the air inlet to settle to the bottom of the dust-collecting box; the other end of the inner drainage pipe is connected to a negative-pressure fan, and the airflow direction in the inner drainage pipe is opposite to that in the positive-pressure air gap; The cyclone tube is used to assist in separating sand and dust from air, and the cyclone tube extends into the drainage inner tube; a cyclone sheet is axially fixed on the outer wall of the cyclone tube, and the cyclone tube can be driven to rotate by a rotary drive mechanism; The drainage inner tube comprises a centrifugal separation part and a fine sand outlet part which are vertically connected. The centrifugal separation part is coaxial with the cyclone tube. The cyclone sheet of the cyclone tube can perform secondary centrifugal separation on the dust-laden airflow after pre-separation by the positive pressure air gap. The fine sand outlet part is connected to a fine sand collection box. The lower end of the cyclone tube extends out of the drainage inner tube, and the cyclone sheet extends upward from the lower side of the cyclone tube to the centrifugal separation part of the drainage inner tube; Compressed air flows through the swirl tube, and the airflow direction in the swirl tube is the same as that in the positive pressure air gap; A HEPA filter is installed on the upper side of the drainage inner tube.

2. The dust removal device for a sandblasting machine according to claim 1, characterized in that: The outer diameter of the swirl plate gradually decreases from bottom to top, and the plate spacing of the swirl plate also gradually decreases from bottom to top.

3. The dust removal device for a sandblasting machine according to claim 1, characterized in that: The lower sides of the inner drainage tube and the outer dust collecting tube are both truncated cone-shaped and gradually shrink from top to bottom, and the bottom end of the inner drainage tube extends to below the air inlet of the dust collecting box.

4. The dust removal device for a sandblasting machine according to claim 1, characterized in that: A three-way regulating valve is installed on the air outlet duct of the negative pressure fan, one end of the three-way regulating valve is connected to the exhaust duct, and the other end is connected to the return duct, and the return duct is connected to the positive pressure air gap.

5. The dust removal device for a sandblasting machine according to claim 4, characterized in that: The connection point between the return air duct and the positive pressure air gap is located above the air inlet of the dust collecting box.

6. The dust removal device for a sandblasting machine according to claim 1, characterized in that: The rotary drive mechanism includes a driving motor, a driving bevel gear and a driven bevel gear. The driving motor is horizontally installed on the top of the drainage inner tube. The driving bevel gear is connected to the output shaft of the driving motor. The driven bevel gear is installed on the vortex tube, and the driven bevel gear meshes with the driving bevel gear.

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