CN216504407U - Automatic sand blasting machine - Google Patents

Abstract

The utility model discloses an automatic sand blasting machine which comprises a rack, a first dust removal chamber, a second dust removal chamber, a sand blasting chamber, a conveyor belt and a spray gun assembly, wherein the rack is provided with a first end and a second end; the first dust chamber is arranged at the first end and is provided with a first air suction opening used for being connected to air suction equipment; the second dust chamber is arranged at the second end, and a second air suction opening for connecting to air suction equipment is formed in the second dust chamber; the sand blasting chamber is arranged between the first dust removing chamber and the second dust removing chamber on the frame; the conveying belt is arranged between the first end and the second end in a spanning mode and used for conveying the workpiece to pass through the first dust removal chamber, the sand blasting chamber and the second dust removal chamber in sequence; the spray gun assembly is suspended in the blasting chamber and is adapted to be connected to a compressed air conduit for blasting sand onto a workpiece entering the blasting chamber. According to the automatic sand blasting machine provided by the embodiment of the utility model, dust generated in the sand blasting process can be sucked away by using the air draft equipment, so that the dust is reduced, and in addition, the working efficiency is high.

Description

Automatic sand blasting machine

Technical Field

The utility model relates to the technical field of surface treatment, in particular to an automatic sand blasting machine.

Background

A sand blasting machine belongs to the category of air conveying machinery, and is characterized in that powdery particles (with the diameter of 1-4 mm) are conveyed from one place to another place in a pipeline by utilizing compressed air, and in the process of converting kinetic energy into potential energy, sand grains moving at high speed are enabled to scour the surface of an object, so that the effect of improving the surface quality of the object is achieved. In the related technology, when the sand blasting machine performs sand blasting operation, dust is large, sand splashes, and the safety is low.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the utility model aims to provide an automatic sand blasting machine.

To achieve the above object, an automatic blasting machine according to an embodiment of the present invention includes:

a frame having a first end and a second end;

the first dust chamber is arranged at the first end, and a first air suction opening for connecting to air suction equipment is formed in the first dust chamber;

the second dust chamber is arranged at the second end, and a second air suction opening for connecting to air suction equipment is formed in the second dust chamber;

the sand blasting chamber is arranged between the first dust removing chamber and the second dust removing chamber on the rack;

the conveying belt spans between the first end and the second end and is used for conveying the workpiece to pass through the first dust chamber, the sand blasting chamber and the second dust chamber in sequence;

the spray gun assembly is arranged in the suspension type sand blasting chamber and is suitable for being connected to a compressed air pipeline for blasting sand to the workpiece entering the sand blasting chamber.

According to the automatic sand blasting machine provided by the embodiment of the utility model, the first dust removal chamber, the second dust removal chamber and the sand blasting chamber are arranged, the sand blasting chamber is positioned between the first dust removal chamber and the second dust removal chamber, and the first air suction opening on the first dust removal chamber and the second air suction opening on the second dust removal chamber are connected to the air suction equipment in the sand blasting work, so that dust generated in the sand blasting process can be sucked away by using the air suction equipment, the dust is reduced, and in addition, the sand blasting is completed in the closed sand blasting chamber, so that the automatic sand blasting machine is safer and more reliable. Furthermore, the conveying belt is used for automatically conveying the workpieces, and the working efficiency is high.

In addition, the automatic sand blasting machine according to the above embodiment of the present invention may further have the following additional technical features:

according to an embodiment of the utility model, a first collecting hopper is arranged at the bottom of the first dust chamber and used for collecting sand falling from the first dust chamber, a second collecting hopper is arranged at the bottom of the second dust chamber and used for collecting sand falling from the second dust chamber, and a third collecting hopper is arranged at the bottom of the sand blasting chamber and used for collecting sand falling from the sand blasting chamber.

According to an embodiment of the present invention, further comprising:

the sand material recovery mechanism is arranged at the bottom of the rack and used for recovering sand materials leaked from the first collecting hopper, the second collecting hopper and the third collecting hopper;

the sand material recovery mechanism is provided with a backflow port which is used for being connected with a compressed air pipeline so as to enable the sand material to flow back to the spray gun assembly through the compressed air pipeline.

According to one embodiment of the utility model, the sand reclamation mechanism comprises:

the conveying cylinder extends along the direction from the first end to the second end, a first material receiving port, a third material receiving port and a second material receiving port are sequentially arranged on the conveying cylinder along the axial direction, the first material receiving port is communicated with the first material collecting hopper, the second material receiving port is communicated with the second material collecting hopper, and the third material receiving port is communicated with the third material collecting hopper;

the rotary shaft is arranged in the feed delivery cylinder, one end of the rotary shaft is provided with a first helical blade, the other end of the rotary shaft is provided with a second helical blade, and the helical directions of the first helical blade and the second helical blade are opposite;

the material collecting box is arranged on the material conveying cylinder and communicated with the bottom of the third material collecting hopper, the material collecting box is positioned between the first helical blade and the second helical blade, and the backflow port is arranged on the material collecting box;

and the first driving mechanism is connected with the rotating shaft and is used for driving the rotating shaft to rotate, so that the sand material in the conveying cylinder is conveyed to the aggregate box.

According to one embodiment of the utility model, the spray gun assembly comprises:

at least one mounting shaft disposed within the blasting chamber;

and the sand blasting guns are arranged on the installation shaft at intervals along the axial direction of the installation shaft.

According to one embodiment of the utility model, the mounting shaft is pivotable about its axis, and the lance assembly further comprises a second drive mechanism coupled to the mounting shaft for driving the mounting shaft in rotation to cause the plurality of blast guns to oscillate for blasting.

According to one embodiment of the utility model, the number of the mounting shafts is two, and the two mounting shafts are arranged in parallel;

the second driving mechanism comprises a second driving motor, a rotary table, a T-shaped rod, a first connecting rod and a second connecting rod, an arc-shaped sliding hole is formed in the rotary table, a sliding pin penetrates through the arc-shaped sliding hole, the first end of the T-shaped rod is rotatably connected with the sliding pin, the second end of the T-shaped rod is rotatably connected with one end of the first connecting rod, and the third end of the T-shaped rod is rotatably connected with one end of the second connecting rod; the other end of the first connecting rod is fixedly connected with one of the two installation shafts, and the other end of the second connecting rod is fixedly connected with the other of the two installation shafts.

According to one embodiment of the utility model, the first dust chamber has a workpiece inlet provided with a first curtain, the second dust chamber has a workpiece outlet provided with a second curtain.

According to one embodiment of the utility model, the conveyor belt is a mesh belt.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an automatic sand blasting machine according to an embodiment of the utility model;

FIG. 2 is a cross-sectional view of an automatic sander according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a second driving mechanism in the automatic sander according to the embodiment of the present invention.

Reference numerals:

a frame 10;

a first dust chamber 20;

a first suction opening 201;

a first curtain 202;

a second dust chamber 30;

a second suction opening 301;

a second curtain 302;

a blasting chamber 40;

a conveyor belt 50;

a spray gun assembly 60;

mounting a shaft 601;

a sand blast gun 602;

a second driving mechanism 603;

a second drive motor 6031;

a turntable 6032;

a T-bar 6033;

a first link 6034;

a second link 6035;

a first collection hopper 70;

a second collection hopper 71;

a third collection hopper 72;

a sand recovery mechanism 80;

a delivery cylinder 801;

a first receiving port 8011;

a second receiving port 8012;

a third receiving port 8013;

a rotating shaft 802;

a first helical blade 8021;

the second helical blade 8022;

a material collecting box 803;

a return port 8031;

a first drive mechanism 804.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the present invention and should not be construed as limiting the present invention, and all other embodiments that can be obtained by one skilled in the art based on the embodiments of the present invention without inventive efforts shall fall within the scope of protection of the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "circumferential," "radial," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

An automatic blasting machine according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1 to 3, an automatic blasting machine according to an embodiment of the present invention includes a frame 10, a first clean room 20, a second clean room 30, a blasting room 40, a conveyor 50, and a spray gun assembly 60.

Specifically, the frame 10 has a first end that is a workpiece input end and a second end that is a workpiece output end, and in operation, an operator moves a workpiece to be processed onto the first end, and when the blasting of the workpiece is completed, the operator can remove the workpiece from the second end.

First clean room 20 is established first end, be equipped with on the first clean room 20 and be used for being connected to the first suction opening 201 of air extraction equipment. Second clean room 30 is established the second end, be equipped with the second suction opening 301 that is used for being connected to air extraction equipment on the second clean room 30. A blast chamber 40 is provided between the first dust chamber 20 and the second dust chamber 30 on the frame 10.

That is to say, the first dust chamber 20, the sandblasting chamber 40 and the second dust chamber 30 are sequentially disposed on the rack 10 along a direction from the first end to the second end of the rack 10, for example, the first dust chamber 20, the sandblasting chamber 40 and the second dust chamber 30 may be formed by sealing metal or plastic plates, the first dust chamber 20 has a first suction opening 201, the second dust chamber 30 has a second suction opening 301, for example, the first suction opening 201 is located at the top of the first dust chamber 20, the second suction opening 301 is located at the top of the second dust chamber 30, in a specific application, the first suction opening 201 and the second suction opening 301 are connected to an external air draft device (for example, an exhaust fan), and the air draft device is used to exhaust air from the first dust chamber 20 and the second dust chamber 30. A grit blasting chamber 40 is located between the first and second dust chambers 20, 30 and the workpiece to be treated can be grit blasted in the grit blasting chamber 40.

A conveyor 50 spans between the first and second ends for transporting the workpiece sequentially through the first dust chamber 20, the blast chamber 40, and the second dust chamber 30. That is, the workpiece may be transferred from the first end to the second end of the frame 10 by the conveyor 50, and in the process, the workpiece passes through the first dust chamber 20, the blasting chamber 40, and the second dust chamber 30 in sequence.

A spray gun assembly 60 is provided suspended within the blasting chamber 40 and is adapted for connection to a compressed air conduit for blasting the workpiece into the blasting chamber 40. That is, the spray gun assembly 60 is located within the blasting chamber 40, and in particular applications, the spray gun assembly 60 is connected to an external compressed air line for blasting the workpiece within the blasting chamber 40 with the spray gun assembly 60 as the workpiece is fed into the blasting chamber 40.

The working process of the automatic sand blasting machine according to the embodiment of the utility model is described as follows:

an operator moves a workpiece to be processed to the conveyor belt 50 at the first end of the rack 10, the conveyor belt 50 rotates to convey the workpiece to the second end of the rack 10, in the process, the workpiece firstly passes through the first dust removal chamber 20 and then enters the sand blasting chamber 40, when the workpiece enters the sand blasting chamber 40, the spray gun assembly 60 sprays sand to the workpiece, so that the workpiece is subjected to surface processing, the processed workpiece passes through the second dust removal chamber 30 along with the conveyor belt 50 and then comes out from the second end of the rack 10, and at the moment, the operator unloads the processed workpiece from the second end of the rack 10. Wherein, the work piece is by the in-process of sandblast, produce great dust in the sandblast room 40, because first clean room 20 and second clean room 30 establish respectively in the both sides of sandblast room 40, and first clean room 20 and second clean room 30 all are connected to air extraction equipment, so, the dust in the sandblast room 40 is inhaled to first clean room 20 and second clean room 30, is taken away by air extraction equipment in first clean room 20 and the second clean room 30 again, so, reach the dust removal purpose.

According to the embodiment of the utility model, the automatic sand blasting machine is provided with the first dust chamber 20, the second dust chamber 30 and the sand blasting chamber 40, wherein the sand blasting chamber 40 is positioned between the first dust chamber 20 and the second dust chamber 30, and in the sand blasting work, the first suction opening 201 on the first dust chamber 20 and the second suction opening 301 on the second dust chamber 30 are connected to the air draft equipment, so that dust generated in the sand blasting process can be sucked away by using the air draft equipment, the dust is reduced, and in addition, the sand blasting is completed in the closed sand blasting chamber 40, so that the automatic sand blasting machine is safer and more reliable. Further, the work is automatically transferred by the transfer belt 50, and the work efficiency is high.

Referring to fig. 2, in an embodiment of the present invention, a first collecting hopper 70 is disposed at the bottom of the first clean room 20 for collecting the sand falling from the first clean room 20, a second collecting hopper 71 is disposed at the bottom of the second clean room 30 for collecting the sand falling from the second clean room 30, and a third collecting hopper 72 is disposed at the bottom of the blasting room 40 for collecting the sand falling from the blasting room 40.

In the blasting operation in the blasting chamber 40, the ejected sand is splashed in different directions and falls down by the action of gravity, and therefore, in this embodiment, the first collecting hopper 70 is provided at the bottom of the first dust removal chamber 20, the second collecting hopper 71 is provided at the bottom of the second dust removal chamber 30, and the third collecting hopper 72 is provided at the bottom of the blasting chamber 40, so that the fallen sand can be collected by the first collecting hopper 70, the second collecting hopper 71, and the third collecting hopper 72, and recycling is facilitated.

Referring to fig. 2, in some embodiments of the present invention, a sand recycling mechanism 80 is further included, and the sand recycling mechanism 80 is disposed at the bottom of the rack 10 and is used for recycling sand leaked from the first collecting hopper 70, the second collecting hopper 71, and the third collecting hopper 72. The sand reclamation mechanism 80 has a return port 8031 for connection to a compressed air conduit for returning the sand to the lance assembly 60 via the compressed air conduit.

That is, the sand recovery mechanism 80 is provided below the first collecting hopper 70, the second collecting hopper 71, and the third collecting hopper 72, and the sand in the first collecting hopper 70, the second collecting hopper 71, and the third collecting hopper 72 can flow into the sand recovery mechanism 80 by the gravity. The sand material recycling mechanism 80 is provided with a return port 8031, and in a specific application, the return port 8031 is connected to a compressed air pipeline, so that the sand material recycled by the sand material recycling mechanism 80 flows back to the spray gun assembly 60 through the compressed air pipeline and is sprayed to a workpiece from the spray gun assembly 60, and therefore, the sand material can be recycled.

In one embodiment of the present invention, the sand recovery mechanism 80 includes a material delivery cylinder 801, a rotating shaft 802, a material collection box 803, and a first driving mechanism 804.

The feeding cylinder 801 extends along the direction from the first end to the second end, a first material receiving port 8011, a third material receiving port 8013 and a second material receiving port 8012 are sequentially arranged on the feeding cylinder 801 along the axial direction, the first material receiving port 8011 is communicated with the first material collecting hopper 70, the second material receiving port 8012 is communicated with the second material collecting hopper 71, and the third material receiving port 8013 is communicated with the third material collecting hopper 72. That is, the bottoms of the first collecting hopper 70, the second collecting hopper 71, and the third collecting hopper 72 are all communicated with the material conveying cylinder 801, and the sand in the first collecting hopper 70, the second collecting hopper 71, and the third collecting hopper 72 flows into the material conveying cylinder 801 under the action of gravity.

The rotation axis 802 is established in the feed delivery cylinder 801, and the one end of rotation axis 802 is equipped with first helical blade 8021, the other end of rotation axis 802 is equipped with second helical blade 8022, first helical blade 8021 with the spiral direction of second helical blade 8022 is opposite. Since the spiral directions of the first spiral blade 8021 and the second spiral blade 8022 are different, when the rotary shaft 802 rotates in one direction, the sand in one end of the feed delivery cylinder 801 and the sand in the other end of the feed delivery cylinder 801 can move toward each other.

The material collecting box 803 is arranged on the material conveying cylinder 801 and communicated with the bottom of the third material collecting hopper 72, the material collecting box 803 is positioned between the first helical blade 8021 and the second helical blade 8022, and the return opening 8031 is arranged on the material collecting box 803. The sand in the third collecting hopper 72 can flow into the aggregate box 803, and the sand in the material conveying cylinder 801 can be conveyed into the aggregate box 803 by the first helical blade 8021 and the second helical blade 8022, and finally flows into the compressed air pipeline from the return opening 8031 on the aggregate box 803, and flows back to the spray gun assembly 60 through the compressed air pipeline.

The first driving mechanism 804 is connected to the rotating shaft 802 for driving the rotating shaft 802 to rotate, so that the sand in the material delivery cylinder 801 is delivered to the material collection box 803.

In the specific working process, the sand materials of the first collecting hopper 70 and the second collecting hopper 71 flow into two ends of the material conveying cylinder 801, and are conveyed to the middle through the first helical blade 8021 and the second helical blade 8022 on the rotating shaft 802 in the material conveying cylinder 801, finally, the sand materials are conveyed to the material collecting box 803 at the middle position, the sand materials of the third collecting hopper 72 flow into the material collecting box 803, and the return port 8031 on the material collecting box 803 is connected to the compressed air pipeline, so the sand materials in the material collecting box 803 flow into the compressed air pipeline through the return port 8031 and flow back to the spray gun assembly 60 through the compressed air pipeline.

In this embodiment, the sand recovery mechanism 80 can recycle the sand in the first collecting hopper 70, the second collecting hopper 71, and the third collecting hopper 72, and has a simple structure and reliable and stable circulation.

It is understood that the first driving mechanism 804 may include a first driving motor and a transmission mechanism, the transmission mechanism may be a chain transmission mechanism, a gear transmission mechanism, or a belt transmission mechanism, and the first driving motor operates to drive the transmission mechanism to move, and then drives the rotating shaft 802 to rotate through the transmission mechanism.

In one embodiment of the present invention, the spray gun assembly 60 includes at least one mounting shaft 601 and a plurality of sand blasting guns 602, the mounting shaft 601 being disposed within the sand blasting chamber; a plurality of the sand blasting guns 602 are arranged on the installation shaft 601 at intervals along the axial direction of the installation shaft 601.

That is, the plurality of sand blasting guns 602 are provided on the mounting shaft 601, and the plurality of sand blasting guns 602 can blast the workpiece in the blasting chamber 40, so that the workpiece in the blasting chamber 40 can be blasted uniformly.

It is understood that the jetting directions of the plurality of sand blasting guns 602 may be the same or different, and may be configured according to the size and requirements of the jetted workpiece.

Referring to fig. 2 and 3, in one embodiment of the present invention, the mounting shaft 601 is pivotable about its own axis, and the spray gun assembly 60 further includes a second driving mechanism 603, wherein the second driving mechanism 603 is connected to the mounting shaft 601 for driving the mounting shaft 601 to rotate so as to swing the plurality of sand blasting guns 602 for blasting sand.

In specific work, the installation shaft 601 can be driven to rotate through the second driving mechanism 603, the installation shaft 601 is driven to swing, the sand blasting gun 602 on the installation shaft 601 is driven to swing, the workpiece can be ensured to be subjected to more uniform sand blasting through the angle of the sand blasting gun 602 which is not swung, and the treatment effect is better.

In one embodiment of the present invention, there are two mounting shafts 601, and the two mounting shafts 601 are arranged in parallel; the second driving mechanism 603 includes a second driving motor 6031, a turntable 6032, a T-shaped rod 6033, a first connecting rod 6034 and a second connecting rod 6035, the turntable 6032 is provided with an arc-shaped sliding hole, a sliding pin penetrates through the arc-shaped sliding hole, a first end of the T-shaped rod 6033 is rotatably connected with the sliding pin, a second end of the T-shaped rod 6033 is rotatably connected with one end of the first connecting rod 6034, and a third end of the T-shaped rod 6033 is rotatably connected with one end of the second connecting rod 6035; the other end of the first link 6034 is fixedly connected to one of the two mounting shafts 601, and the other end of the second link 6035 is fixedly connected to the other of the two mounting shafts 601.

When the second driving motor 6031 during operation, the electronic carousel 6032 of second driving motor 6031 is rotatory, carousel 6032 further drives the swing of T type pole 6033, the second end and the third end of T type pole 6033 drive first connecting rod 6034 and second connecting rod 6035 respectively and rotate, because first connecting rod 6034 is fixed with an installation axle 601, second connecting rod 6035 is fixed with another installation axle 601, so, when first connecting rod 6034 and second connecting rod 6035 rotate, can drive the installation axle 601 rotatory, so, can drive a plurality of sand blasting guns 602 swing injection on the installation axle 601 and spray, in this embodiment, drive installation axle 601 through above-mentioned second actuating mechanism 603, its simple structure, the linkage swing is reliable and stable.

In one embodiment of the present invention, the first dust chamber 20 has a workpiece inlet provided with a first curtain 202, and the second dust chamber 30 has a workpiece outlet provided with a second curtain 302. So, utilize first check curtain 202 and second check curtain 302 can shelter from dust and sand material etc. and reveal to the outside from work piece entry and work piece export, play better isolation protection for operational environment is clean more sanitary, and simultaneously, the security is also higher.

Advantageously, the conveyor belt 50 is a mesh belt, which facilitates the sand material falling under gravity into the first collection hopper 70, the second collection hopper 71 and the third collection hopper 72 below.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the technical solutions of the present invention, which are made by using the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (9)

1. An automatic blasting machine, comprising:

a frame having a first end and a second end;

the first dust chamber is arranged at the first end, and a first air suction opening for connecting to air suction equipment is formed in the first dust chamber;

the second dust chamber is arranged at the second end, and a second air suction opening for connecting to air suction equipment is formed in the second dust chamber;

the sand blasting chamber is arranged between the first dust removing chamber and the second dust removing chamber on the rack;

the conveying belt spans between the first end and the second end and is used for conveying workpieces to pass through the first dust chamber, the sand blasting chamber and the second dust chamber in sequence;

a spray gun assembly suspended within the blasting chamber and adapted for connection to a compressed air conduit for blasting the workpiece into the blasting chamber.

2. The automatic sand blasting machine according to claim 1, wherein a first collecting hopper is arranged at the bottom of the first dust chamber for collecting the sand falling from the first dust chamber, a second collecting hopper is arranged at the bottom of the second dust chamber for collecting the sand falling from the second dust chamber, and a third collecting hopper is arranged at the bottom of the sand blasting chamber for collecting the sand falling from the sand blasting chamber.

3. The automatic sander of claim 2, further comprising:

the sand material recovery mechanism is arranged at the bottom of the rack and used for recovering sand materials leaked from the first collecting hopper, the second collecting hopper and the third collecting hopper;

the sand material recovery mechanism is provided with a backflow port which is used for being connected with a compressed air pipeline so as to enable the sand material to flow back to the spray gun assembly through the compressed air pipeline.

4. The automatic sander of claim 3, wherein the sand reclamation mechanism comprises:

the conveying cylinder extends along the direction from the first end to the second end, a first material receiving port, a third material receiving port and a second material receiving port are sequentially arranged on the conveying cylinder along the axial direction, the first material receiving port is communicated with the first material collecting hopper, the second material receiving port is communicated with the second material collecting hopper, and the third material receiving port is communicated with the third material collecting hopper;

the rotary shaft is arranged in the feed delivery cylinder, one end of the rotary shaft is provided with a first helical blade, the other end of the rotary shaft is provided with a second helical blade, and the helical directions of the first helical blade and the second helical blade are opposite;

the material collecting box is arranged on the material conveying cylinder and communicated with the bottom of the third material collecting hopper, the material collecting box is positioned between the first helical blade and the second helical blade, and the backflow port is arranged on the material collecting box;

and the first driving mechanism is connected with the rotating shaft and is used for driving the rotating shaft to rotate, so that the sand material in the conveying cylinder is conveyed to the aggregate box.

5. The automatic sander of claim 1, wherein the spray gun assembly comprises:

at least one mounting shaft disposed within the blasting chamber;

and the sand blasting guns are arranged on the installation shaft at intervals along the axial direction of the installation shaft.

6. The automatic sander of claim 5, wherein said mounting shaft is pivotable about its axis, said spray gun assembly further comprising a second drive mechanism coupled to said mounting shaft for driving rotation of said mounting shaft to cause a plurality of said sand blasting guns to oscillate for blasting sand.

7. The automatic sander of claim 6, wherein there are two of said mounting shafts, said two mounting shafts being arranged in parallel;

the second driving mechanism comprises a second driving motor, a rotary table, a T-shaped rod, a first connecting rod and a second connecting rod, an arc-shaped sliding hole is formed in the rotary table, a sliding pin penetrates through the arc-shaped sliding hole, the first end of the T-shaped rod is rotatably connected with the sliding pin, the second end of the T-shaped rod is rotatably connected with one end of the first connecting rod, and the third end of the T-shaped rod is rotatably connected with one end of the second connecting rod; the other end of the first connecting rod is fixedly connected with one of the two installation shafts, and the other end of the second connecting rod is fixedly connected with the other of the two installation shafts.

8. The automatic sander of claim 1, wherein said first clean room has a workpiece inlet with a first curtain and said second clean room has a workpiece outlet with a second curtain.

9. The automatic sander of claim 1, wherein the conveyor belt is a mesh belt.

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