阅读说明：本技术 一种粗细颗粒分离的机械零件表面干式喷砂机 (Mechanical part surface dry sand blasting machine with coarse and fine particle separation function ) 是由 汪帆 于 2021-01-20 设计创作，主要内容包括：本发明公开了一种粗细颗粒分离的机械零件表面干式喷砂机,包括喷射箱以及设置于所述喷射箱下侧的动力机构、筛选机构、抽取机构,所述喷射箱后侧设有放砂机构,本发明将本身就较为细碎的喷砂再进行进一步的使用前分离,而后进行粗细处理两道步骤,在不易产生扬尘的粗颗粒阶段,加大喷砂的力度,进而快速的完成工件表面粗处理,而在易产生扬尘的细颗粒阶段,在气体分流降低冲击速度的同时,在装置上方使用了正压的气流,使得扬起的灰尘,尽可能落到装置底部进行回收,减少上侧人工更换工件区域的灰尘,极大的保护了操作人员的身心健康,同时本发明实现了处理过程自动化,大大提高了处理效率,节省了劳动力,降低了干式喷砂机的使用成本。(The invention discloses a mechanical part surface dry type sand blasting machine for separating coarse and fine particles, which comprises a spraying box, a power mechanism, a screening mechanism and an extracting mechanism, wherein the power mechanism, the screening mechanism and the extracting mechanism are arranged on the lower side of the spraying box, the back side of the spraying box is provided with a sand releasing mechanism, the sand blasting machine further separates the sand blasting which is relatively fine and fine before use, and then performs two steps of coarse and fine treatment, the strength of the sand blasting is increased in a coarse particle stage which is not easy to generate dust, so that the workpiece surface coarse treatment is rapidly completed, in a fine particle stage which is easy to generate dust, positive pressure airflow is used above the device while the impact speed is reduced by gas diversion, so that the raised dust falls to the bottom of the device as far as possible to be recovered, the dust in the upper manual workpiece replacing area is reduced, the physical and mental health of operators is greatly protected, and meanwhile, the invention realizes the automation of, the treatment efficiency is greatly improved, the labor force is saved, and the use cost of the dry sand blasting machine is reduced.)

1. The utility model provides a mechanical parts surface dry-type sand blasting machine of thickness granule separation which characterized in that: the sand-discharging device comprises a spraying box, and a power mechanism, a screening mechanism and an extracting mechanism which are arranged on the lower side of the spraying box, wherein a sand-discharging mechanism is arranged on the rear side of the spraying box, a pneumatic mechanism is arranged on the left side of the spraying box, a spraying cavity is arranged in the spraying box, a dust-falling mechanism, a placing mechanism and a control mechanism are arranged in the spraying cavity, an opening door which can be opened downwards and outwards is arranged on the right wall of the spraying cavity, a workpiece can be placed in the spraying cavity after the opening door is opened outwards, and a handle is arranged on the right side of the opening door to facilitate; the screening mechanism comprises a screening box positioned on the lower side of the spraying box, a screening cavity is arranged in the screening box, a fine sand box is connected to the lower side of the screening cavity, a screening cavity which can enter unseparated sand blasting is connected to the left wall of the screening cavity, two rotating bases which are symmetrical front and back are arranged on the rear wall of the screening cavity, two fixed bases which are symmetrical to the rear wall of the screening cavity are arranged on the left side of each rotating base through a power frame in a rotating mode, a vibrating plate is connected to the upper side of the power frame in a rotating mode, the rotating bases are connected with the power frame in a rotating mode through driven gear shafts, driven bevel gears are arranged on the right sides of the screening box in a manner that one ends of the driven gear shafts extend to the right sides of the screening box, driving bevel gears are connected to the upper sides of the driven bevel gears in, the front wall of the screening cavity is connected with a coarse sand pipe, the lower end of the coarse sand pipe is connected with a coarse sand box, a coarse sand plate is arranged in the coarse sand box in a sliding mode, the lower side of the coarse sand plate is elastically connected with the bottom wall of the coarse sand box through a spring, and after sand blasting of the blanking pipe enters the screening cavity, under the driving of the driven belt pulley, finer sand blasting falls into the fine sand box through a vibrating plate, and larger particles fall into the coarse sand box to complete separation; the pneumatic mechanism comprises a pneumatic box fixedly positioned on the left side of the injection box, the pneumatic box is provided with a pneumatic cavity, an air pump is arranged on the inner wall of the pneumatic cavity, the right side of the air pump is connected with an air jet pipe, the right end of the air jet pipe is connected with a spray pipe, the right end of the spray pipe extends into the injection cavity, the left end of the spray pipe is connected with an absorption pipe, the lower side of the absorption pipe extends to the lower side of the pneumatic box, the right end of the spray pipe is positioned in the injection cavity and is provided with a spray head, when the air pump is started, the air jet pipe sprays air into the spray pipe, negative pressure is formed in the absorption pipe at the moment, sand; the extracting mechanism comprises a suction pipe positioned in the fine sand box, the suction pipe is arranged on the upper side of the bottom wall of the fine sand box, the right end of the fine sand box extends into the coarse sand box, the middle section of the suction pipe is connected with the absorption pipe, a spring frame and a resistance frame are fixedly arranged at the rear side of the absorption tube in the absorption tube, a resistance block is arranged in the resistance frame in a sliding manner, one side of the resistance block is elastically connected with the spring frame through a spring, when the absorption pipe is started to start to extract, the absorption pipe firstly extracts coarse particles in the coarse sand box with lower pressure, when the coarse sand box is completely pumped, the coarse sand plate is tightly attached to the right end of the suction pipe to prevent air from being pumped, at the moment, the resistance block is pushed rightwards to suck the fine particles in the coarse sand box into the absorption pipe to fulfill the aim of respectively pumping and separating, simultaneously, the speed of the fine particles is reduced by a part under the action of the elastic force of the spring at the rear side of the resistance block; the dust falling mechanism comprises an airflow pipe connected to the upper side of the jet pipe, the right end of the airflow pipe extends into the jet cavity and is connected with a dust falling head with the upper end fixed on the top wall of the jet cavity, the upper side of the jet pipe positioned in the jet cavity is fixedly provided with a pneumatic box, a pneumatic cavity is arranged in the pneumatic box, the lower side of the pneumatic cavity is connected with the jet pipe, a snap ring is fixedly arranged in the pneumatic cavity, the inner wall of the pneumatic cavity is provided with a pneumatic sliding plate in a sliding manner, the upper side of the pneumatic sliding plate is provided with a pneumatic snap plate extending into the airflow pipe, when coarse dust falling particles do not need to flow in the jet pipe, the pneumatic snap plate seals the airflow pipe under the condition of high air pressure of the jet pipe, the flow speed in the jet pipe is further increased, otherwise, when fine particles flow in the jet pipe, the dust falling head can spray gas downwards, and suspended dust in the spraying cavity is reduced.

2. A dry sand blasting machine for separating thick and thin particles on the surface of mechanical parts according to claim 1, wherein: power unit is including being located two supporting legss of injection case downside bilateral symmetry, be equipped with the backup pad between the supporting legs, the fixed motor that is equipped with of backup pad upside, the motor upside is equipped with and extends to spray the main shaft of intracavity, the main shaft is located be equipped with drive pulley on the injection case downside part, the last belt that is equipped with of drive pulley, the belt rear end extends to screening case right side is connected passive pulley, does screening mechanism provides power, the main shaft is located spray chamber diapire upper portion and be connected with the scraper blade, be equipped with on the injection chamber diapire with the recovery mouth of screening chamber upside intercommunication works as during the main shaft is rotatory, just can pass through the scraper blade will the sandblast that sprays on the chamber diapire is sent to accomplish cyclic utilization in the screening chamber.

3. A dry sand blasting machine for separating thick and thin particles on the surface of mechanical parts according to claim 1, wherein: the mechanism of placing is including fixed being located spout bushing on the lateral wall of chamber, it can make the sandblast of upside fall to be equipped with the hole on the bushing spout on the diapire in chamber, the main shaft upper end extends to the bushing upside is equipped with the gear, the meshing of gear outside is connected with interior tooth cover, interior tooth cover upper end is connected with places the board, opens when placing personnel open just can place the work piece that needs the sandblast behind the opening door place the board upside, when the motor starts, place the board and just can drive the rotatory even sandblast of work piece.

4. A dry sand blasting machine for separating thick and thin particles on the surface of mechanical parts according to claim 1, wherein: control mechanism is including being located lift box on the bushing, be equipped with the ascending and descending chamber of upwards opening in the lift box, the ascending and descending intracavity slides and is equipped with the lift slide, the lift slide downside passes through spring elastic connection the diapire in ascending and descending chamber, the lift slide upside is equipped with the lifter, lifter upside butt place the downside of board, the gear with can slide from top to bottom when meshing between the interior tooth cover, the lift slide rear side is connected with the lever, the lever downside pass through roating seat swivelling joint in the bushing upside, lever one end extends to be equipped with the trigger head on the injection box rear side, the first upside of triggering is equipped with and is fixed in the rotation motor of injection box rear side, work as when placing the work piece on the board, the lever just can trigger rotate the motor.

5. A dry sand blasting machine for separating thick and thin particles on the surface of mechanical parts according to claim 1, wherein: the sand discharging mechanism comprises a rotating motor, a rotating shaft is arranged on the left side of the rotating motor, a sand dropping pipe is arranged on the rotating shaft, a sand blasting box is arranged at the upper end of the sand dropping pipe, fan blades are uniformly arranged in the sand dropping pipe by the rotating shaft, a strut is arranged at the lower side of the sand dropping pipe, the front end of the strut is fixed at the rear side of the sand blasting box, a stopping plate is arranged at the upper end of the strut in a rotating manner, the stopping plate can catch sand blasting particles falling from the sand dropping pipe, a fixing rod is arranged at the rear side of the strut to prevent the stopping plate from rotating towards the rear side, a sliding block is arranged on the strut in a sliding manner, a sliding connecting rod is arranged at the front side of the sliding block in a rotating manner, the upper end of the sliding connecting rod is connected with the lower side of the stopping plate in a rotating manner, when, the stop plate front end is connected with the rear end of the lever through a connecting wire, at the moment, the trigger head is separated from the rotating motor, at the moment, the weight of the workpiece placed on the placing plate can be controlled, and then the waste of sand blasting is reduced.

Technical Field

The invention relates to a mechanical part surface dry sand blasting machine for separating coarse particles from fine particles, and mainly relates to the technical field of sand blasting.

Background

The sand blasting machine is an air conveying machine, and the principle is that powder particle materials are conveyed from one place to another place by utilizing compressed air in a pipeline, 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;

at present, most suction dry sand blasting machines are used, compressed air is used as power, negative pressure is formed in a spray gun through high-speed movement of air flow, abrasive materials are sucked into the spray gun through a sand conveying pipe and are ejected out through a nozzle to be sprayed to the surface to be processed, and the expected processing purpose is achieved. In a suction type dry sand blasting machine, compressed air is not only feeding power but also jet flow accelerating power, the dry sand blasting machine is high in treatment efficiency and low in use price, but has the problems of high pollution and difficulty in cleaning the interior of a machine after use, the machine is easy to age after long-term use, equipment breaking cost is high, the blasting materials of the dry sand blasting machine are generally difficult to recycle, and a user is difficult to control the using amount, so that the defects of a large amount of sand blasting and sand blasting are caused.

Disclosure of Invention

The invention aims to solve the technical problem of providing a mechanical part surface dry sand blasting machine for separating coarse particles from fine particles, and overcomes the problems.

The invention is realized by the following technical scheme.

The invention relates to a mechanical part surface dry type sand blasting machine with coarse and fine particle separation, which comprises a spraying box, and a power mechanism, a screening mechanism and an extracting mechanism which are arranged on the lower side of the spraying box, wherein a sand releasing mechanism is arranged on the rear side of the spraying box, a pneumatic mechanism is arranged on the left side of the spraying box, a spraying cavity is arranged in the spraying box, a dust falling mechanism, a placing mechanism and a control mechanism are arranged in the spraying cavity, an opening door capable of being opened downwards and outwards is arranged on the right wall of the spraying cavity, a workpiece can be placed in the spraying cavity after the opening door is opened outwards, and a handle is arranged on the right side of the opening door to facilitate opening;

the screening mechanism comprises a screening box positioned on the lower side of the spraying box, a screening cavity is arranged in the screening box, a fine sand box is connected to the lower side of the screening cavity, a screening cavity which can enter unseparated sand blasting is connected to the left wall of the screening cavity, two rotating bases which are symmetrical front and back are arranged on the rear wall of the screening cavity, two fixed bases which are symmetrical to the rear wall of the screening cavity are arranged on the left side of each rotating base through a power frame in a rotating mode, a vibrating plate is connected to the upper side of the power frame in a rotating mode, the rotating bases are connected with the power frame in a rotating mode through driven gear shafts, driven bevel gears are arranged on the right sides of the screening box in a manner that one ends of the driven gear shafts extend to the right sides of the screening box, driving bevel gears are connected to the upper sides of the driven bevel gears in, the front wall of the screening cavity is connected with a coarse sand pipe, the lower end of the coarse sand pipe is connected with a coarse sand box, a coarse sand plate is arranged in the coarse sand box in a sliding mode, the lower side of the coarse sand plate is elastically connected with the bottom wall of the coarse sand box through a spring, and after sand blasting of the blanking pipe enters the screening cavity, under the driving of the driven belt pulley, finer sand blasting falls into the fine sand box through a vibrating plate, and larger particles fall into the coarse sand box to complete separation;

the pneumatic mechanism comprises a pneumatic box fixedly positioned on the left side of the injection box, the pneumatic box is provided with a pneumatic cavity, an air pump is arranged on the inner wall of the pneumatic cavity, the right side of the air pump is connected with an air jet pipe, the right end of the air jet pipe is connected with a spray pipe, the right end of the spray pipe extends into the injection cavity, the left end of the spray pipe is connected with an absorption pipe, the lower side of the absorption pipe extends to the lower side of the pneumatic box, the right end of the spray pipe is positioned in the injection cavity and is provided with a spray head, when the air pump is started, the air jet pipe sprays air into the spray pipe, negative pressure is formed in the absorption pipe at the moment, sand;

the extracting mechanism comprises a suction pipe positioned in the fine sand box, the suction pipe is arranged on the upper side of the bottom wall of the fine sand box, the right end of the fine sand box extends into the coarse sand box, the middle section of the suction pipe is connected with the absorption pipe, a spring frame and a resistance frame are fixedly arranged at the rear side of the absorption tube in the absorption tube, a resistance block is arranged in the resistance frame in a sliding manner, one side of the resistance block is elastically connected with the spring frame through a spring, when the absorption pipe is started to start to extract, the absorption pipe firstly extracts coarse particles in the coarse sand box with lower pressure, when the coarse sand box is completely pumped, the coarse sand plate is tightly attached to the right end of the suction pipe to prevent air from being pumped, at the moment, the resistance block is pushed rightwards to suck the fine particles in the coarse sand box into the absorption pipe to fulfill the aim of respectively pumping and separating, simultaneously, the speed of the fine particles is reduced by a part under the action of the elastic force of the spring at the rear side of the resistance block;

the dust falling mechanism comprises an airflow pipe connected to the upper side of the jet pipe, the right end of the airflow pipe extends into the jet cavity and is connected with a dust falling head with the upper end fixed on the top wall of the jet cavity, the upper side of the jet pipe positioned in the jet cavity is fixedly provided with a pneumatic box, a pneumatic cavity is arranged in the pneumatic box, the lower side of the pneumatic cavity is connected with the jet pipe, a snap ring is fixedly arranged in the pneumatic cavity, the inner wall of the pneumatic cavity is provided with a pneumatic sliding plate in a sliding manner, the upper side of the pneumatic sliding plate is provided with a pneumatic snap plate extending into the airflow pipe, when coarse dust falling particles do not need to flow in the jet pipe, the pneumatic snap plate seals the airflow pipe under the condition of high air pressure of the jet pipe, the flow speed in the jet pipe is further increased, otherwise, when fine particles flow in the jet pipe, the dust falling head can spray gas downwards, and suspended dust in the spraying cavity is reduced.

Further, power unit is including being located two supporting legss of injection case downside bilateral symmetry, be equipped with the backup pad between the supporting legs, the fixed motor that is equipped with of backup pad upside, the motor upside is equipped with and extends to spray the main shaft of intracavity, the main shaft is located be equipped with drive pulley on the injection case downside part, the last belt that is equipped with of drive pulley, the belt rear end extends to screening case right side is connected passive pulley, for screening mechanism provides power, the main shaft is located spray chamber diapire upper portion and be connected with the scraper blade, be equipped with on the injection chamber diapire with the recovery mouth of screening chamber upside intercommunication, work as when the main shaft is rotatory, just can pass through the scraper blade will the sandblast on the injection chamber diapire is sent to accomplish cyclic utilization in the screening chamber.

Further, the placing mechanism comprises a bushing fixedly positioned on the side wall of the injection cavity, the upper end of the main shaft is extended to the upper side of the bushing, an inner gear sleeve is meshed and connected with the outer side of the gear, a placing plate is connected to the upper end of the inner gear sleeve, the placing plate is opened by a placing person, a workpiece needing sand blasting can be placed behind the opening door and the upper side of the placing plate is placed, and when the motor is started, the placing plate can drive the workpiece to perform rotary and uniform sand blasting.

Further, control mechanism is including being located lift box on the bushing, be equipped with the ascending and descending chamber of upwards opening in the lift box, the lift intracavity slides and is equipped with the lifting slide, the lifting slide downside passes through spring elastic connection the diapire in ascending and descending chamber, the lifting slide upside is equipped with the lifter, lifter upside butt place the downside of board, the gear with can slide from top to bottom when meshing between the interior tooth cover, the lifting slide rear side is connected with the lever, the lever downside pass through roating seat swivelling joint in the bushing upside, lever one end extends to be equipped with on the injection box rear side and triggers the head, it is equipped with and is fixed in to trigger the first upside spray the rotation motor of case rear side, work as when placing the work piece on the board, the lever just can trigger rotate the motor.

Furthermore, the sand discharging mechanism comprises the rotating motor, a rotating shaft is arranged on the left side of the rotating motor, a sand dropping pipe is arranged on the rotating shaft, a sand blasting box is arranged at the upper end of the sand dropping pipe, fan blades are uniformly arranged in the sand dropping pipe by the rotating shaft, a support with the front end fixed at the rear side of the sand dropping pipe is arranged at the lower side of the sand dropping pipe, a stopping plate is rotatably arranged at the upper end of the support, the stopping plate can receive sand blasting particles falling from the sand dropping pipe, a fixing rod is arranged at the rear side of the support and can prevent the stopping plate from rotating towards the rear side, a sliding block is slidably arranged on the support, a sliding connecting rod is rotatably arranged at the front side of the sliding block, the upper end of the sliding connecting rod is rotatably connected with the lower side of the stopping plate, when sand on the stopping plate reaches a certain weight, the stopping plate can tip forwards, the stop plate front end is connected with the rear end of the lever through a connecting wire, at the moment, the trigger head is separated from the rotating motor, at the moment, the weight of the workpiece placed on the placing plate can be controlled, and then the waste of sand blasting is reduced.

The invention has the beneficial effects that: the invention further separates the sand blasting which is relatively fine and broken, and then carries out two steps of coarse and fine treatment, increases the sand blasting force in the coarse particle stage which is not easy to generate dust, further quickly completes the coarse treatment of the surface of the workpiece, and uses positive pressure airflow above the device to ensure that the raised dust falls to the bottom of the device for recycling as much as possible in the fine particle stage which is easy to generate dust, thereby reducing the dust in the upper manual workpiece replacement area, greatly protecting the physical and mental health of operators, realizing the automation of the treatment process, greatly improving the treatment efficiency, saving the labor force and reducing the use cost of the dry sand blasting machine.

Drawings

In order to more clearly illustrate the embodiments of the 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, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic view of the structure a-a in fig. 1.

Fig. 3 is a schematic diagram of the structure B-B in fig. 2.

Fig. 4 is an enlarged schematic view of C in fig. 2.

Detailed Description

The invention will now be described in detail with reference to fig. 1-4, wherein for ease of description the orientations described hereinafter are now defined as follows: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

The mechanical part surface dry type sand blasting machine capable of separating coarse particles from fine particles, which is described in conjunction with the attached drawings 1-4, comprises a spraying box 10, and a power mechanism 100, a screening mechanism 101 and an extraction mechanism 102 which are arranged on the lower side of the spraying box 10, wherein a sand placing mechanism 103 is arranged on the rear side of the spraying box 10, a pneumatic mechanism 104 is arranged on the left side of the spraying box 10, a spraying cavity 11 is arranged in the spraying box 10, a dust falling mechanism 105, a placing mechanism 106 and a control mechanism 107 are arranged in the spraying cavity 11, an opening door 12 which can be opened downwards and outwards is arranged on the right wall of the spraying cavity 11, a workpiece can be placed in the spraying cavity 11 after the opening door 12 is opened outwards, and a handle 13 is arranged on the right side of the opening door 12;

the screening mechanism 101 comprises a screening box 58 positioned on the lower side of the injection box 10, a screening cavity 59 is arranged in the screening box 58, a fine sand box 64 is connected on the lower side of the screening cavity 59, the left wall of the screening cavity 59 is connected with the screening cavity 59 capable of entering unseparated sand blasting, two rotating bases 61 symmetrical front and back are arranged on the rear wall of the screening cavity 59, two fixed bases 63 symmetrically arranged on the rear wall of the screening cavity 59 are rotatably arranged on the left side of the rotating base 61 through a power frame 62, a vibration plate 60 is rotatably connected on the upper side of the power frame 62, the rotating base 61 is rotatably connected with the power frame 62 through a driven gear shaft 74, one end of the driven gear shaft 74 extends to the right side of the screening box 58 and is provided with a driven bevel gear 73, the upper side of the driven bevel gear 73 is engaged with a driving bevel gear 72, and, the left side of the connecting shaft 70 is connected to the screening box 58 through a screening cavity 59, the upper end of the connecting shaft 70 is provided with a rotating driven belt pulley 71, the front wall of the screening cavity 59 is connected with a coarse sand pipe 65, the lower end of the coarse sand pipe 65 is connected with a coarse sand box 66, a coarse sand plate 67 is arranged in the coarse sand box 66 in a sliding manner, the lower side of the coarse sand plate 67 is elastically connected with the bottom wall of the coarse sand box 66 through a spring, and after the sand blasting of the blanking pipe 56 enters the screening cavity 59, the finer sand blasting falls into the fine sand box 64 through a vibration plate 60 under the driving of the driven belt pulley 71, and the larger particles fall into the coarse sand box 66 to complete separation;

the pneumatic mechanism 104 comprises a pneumatic box 31 fixedly positioned on the left side of the injection box 10, the pneumatic box 31 is provided with a pneumatic cavity 33, an air pump 34 is arranged on the inner wall of the pneumatic cavity 33, the right side of the air pump 34 is connected with an air injection pipe 35, the right end of the air injection pipe 35 is connected with a spray pipe 30, the right end of the spray pipe 30 extends into the injection cavity 11, the left end of the spray pipe 30 is connected with an absorption pipe 32, the lower side of the absorption pipe 32 extends to the lower side of the pneumatic box 31, the right end of the spray pipe 30 is positioned in the injection cavity 11 and is provided with a spray head 29, when the air pump 34 is started, the air injection pipe 35 injects air into the spray pipe 30, and negative pressure is formed in the absorption pipe 32 at the moment to suck the;

the extracting mechanism 102 comprises an extracting pipe 68 located in the fine sand box 64, the extracting pipe 68 is located on the upper side of the bottom wall of the fine sand box 64, the right end of the fine sand box 64 extends into the coarse sand box 66, the absorbing pipe 32 is connected to the middle section of the extracting pipe 68, a spring frame 77 and a resistance frame 76 are fixedly arranged in the extracting pipe 68 at the rear side of the absorbing pipe 32, a resistance block 75 is arranged in the resistance frame 76 in a sliding manner, one side of the resistance block 75 is elastically connected with the spring frame 77 through a spring, when the absorbing pipe 32 starts to start extracting, the extracting pipe 68 firstly extracts coarse particles in the coarse sand box 66 with smaller pressure, when the extracting in the coarse sand box 66 is finished, the coarse sand plate 67 clings to the right end of the extracting pipe 68 to make the extracting pipe incapable of exhausting, at the moment, the resistance block 75 is pushed rightwards, and the fine particles in the coarse sand box 66 are sucked into the absorbing pipe 32 to finish the extracting purpose respectively, at the same time, the speed of the fine particles is reduced by a part under the action of the spring force on the rear side of the resistance block 75;

the dust settling mechanism 105 comprises an air flow pipe 36 connected to the upper side of the air jet pipe 35, the right end of the air flow pipe 36 extends into the jet cavity 11 to be connected with a dust settling head 42 with the upper end fixed on the top wall of the jet cavity 11, the upper side of the jet pipe 30 located in the jet cavity 11 is fixedly provided with a pneumatic box 37, a pneumatic cavity 38 is arranged in the pneumatic box 37, the lower side of the pneumatic cavity 38 is connected with the jet pipe 30, a snap ring 39 is fixedly arranged in the pneumatic cavity 38, a pneumatic slide plate 40 is slidably arranged on the inner wall of the pneumatic cavity 38, a pneumatic clamping plate 41 extending into the air flow pipe 36 is arranged on the upper side of the pneumatic slide plate 40, when coarse particles which do not need dust settling flow in the jet pipe 30, under the condition that the air pressure of the jet pipe 30 is high, the pneumatic clamping plate 41 seals the air flow pipe 36 to further increase the flow speed in the jet pipe 30, otherwise when fine particles, due to the fact that the pressure is low, the pneumatic clamping plate 41 descends, the dust falling head 42 sprays gas downwards, and suspended dust in the spraying cavity 11 is reduced.

Advantageously, the actuating mechanism 100 comprises two support feet 15 which are positioned on the lower side of the spraying box 10 in a bilateral symmetry, a supporting plate 16 is arranged between the supporting legs 15, a motor 17 is fixedly arranged on the upper side of the supporting plate 16, a main shaft 18 extending into the spraying cavity 11 is arranged on the upper side of the motor 17, a driving belt pulley 19 is arranged on the part of the main shaft 18 positioned on the lower side of the spraying box 10, the driving belt pulley 19 is provided with a belt 20, the rear end of the belt 20 extends to the right side of the screening box 58 and is connected with the driven belt pulley 71 to provide power for the screening mechanism 101, the part of the main shaft 18, which is positioned on the bottom wall of the spraying cavity 11, is connected with a scraping plate 78, the bottom wall of the spraying cavity 11 is provided with a recovery port 57 communicated with the upper side of the screening cavity 59, when the main shaft 18 rotates, the sand blasting on the bottom wall of the spraying cavity 11 can be sent to the screening cavity 59 through the scraper 78 for recycling.

Beneficially, the placing mechanism 106 includes a bushing 14 fixedly located on the side wall of the spraying chamber 11, the bushing 14 is provided with a hole to enable the sand blasting on the upper side to fall on the bottom wall of the spraying chamber 11, the upper end of the main shaft 18 extends to the upper side of the bushing 14 and is provided with a gear 27, the outer side of the gear 27 is engaged and connected with an inner gear sleeve 26, the upper end of the inner gear sleeve 26 is connected with a placing plate 25, when a placing person opens the opening door 12, the workpiece needing sand blasting can be placed on the upper side of the placing plate 25, and when the motor 17 is started, the placing plate 25 can drive the workpiece to rotate and uniformly sand blasting.

Beneficially, the control mechanism 107 includes a lifting box 21 located on the bushing 14, an upward-opening lifting cavity 22 is provided in the lifting box 21, a lifting slide plate 23 is slidably provided in the lifting cavity 22, a lower side of the lifting slide plate 23 is elastically connected to a bottom wall of the lifting cavity 22 through a spring, a lifting rod 24 is provided on an upper side of the lifting slide plate 23, an upper side of the lifting rod 24 abuts against a lower side of the placing plate 25, the gear 27 and the inner gear sleeve 26 are engaged and can slide up and down, a lever 43 is connected to a rear side of the lifting slide plate 23, a lower side of the lever 43 is rotatably connected to an upper side of the bushing 14 through a rotating base 44, one end of the lever 43 extends to the rear side of the spraying box 10 and is provided with a trigger head 45, a rotating motor 46 fixed to the rear side of the spraying box 10 is provided on the upper side of the trigger head 45, when, the lever 43 is able to trigger the rotation motor 46.

Advantageously, the sand discharging mechanism 103 comprises the rotating motor 46, a rotating shaft 49 is arranged on the left side of the rotating motor 46, a sand dropping pipe 48 is arranged on the rotating shaft 49, a sand blasting box 47 is arranged at the upper end of the sand dropping pipe 48, fan blades are uniformly arranged in the sand dropping pipe 48 through the rotating shaft 49, a pillar 52 with the front end fixed to the rear side of the sand blasting box 10 is arranged on the lower side of the sand dropping pipe 48, a stopping plate 50 is arranged at the upper end of the pillar 52 in a rotating manner, the stopping plate 50 can receive sand blasting particles falling from the sand dropping pipe 48, a fixing rod 51 is arranged on the rear side of the pillar 52 to prevent the stopping plate 50 from rotating towards the rear side, a sliding block 53 is arranged on the pillar 52 in a sliding manner, a sliding connecting rod 54 is arranged on the front side of the sliding block 53 in a rotating manner, the upper end of the sliding connecting rod 54 is rotatably connected with, the stopping plate 50 can be overturned towards the front side, the blanking pipe 56 is arranged on the support column 52 and is connected with the screening cavity 59, the front end of the stopping plate 50 is connected with the rear end of the lever 43 through a connecting wire 55, at the moment, the trigger head 45 is separated from the rotating motor 46, the weight of a workpiece placed on the placing plate 25 can be reached to control the weight of sand blasting, and further the waste of sand blasting is reduced.

Sequence of mechanical actions of the whole device:

1. before starting, the operator opens the opening door 12 through the handle 13, and places the workpiece to be sandblasted on the upper side of the placing plate 25;

2. at this time, the placing plate 25 presses down the front end of the lever 43 through the inner gear sleeve 26, the lifting rod 24 and the lifting sliding plate 23;

3. the rear end of the lever 43 places the sand in the sand-blasting box 47 on the upper side of the staying plate 50 through the trigger head 45, the rotating motor 46, the rotating shaft 49, the sand-blasting box 47 and the shakeout pipe 48, and meanwhile, the staying plate 50 is inclined to pull back the lever 43 through the connecting line 55, so that the rotating motor 46 does not rotate to achieve the purpose of controlling the usage amount of the sand;

4. the staying plate 50 is further inclined under the action of the sliding block 53 and the sliding connecting rod 54, so that the sand on the staying plate 50 falls on the surface of the vibrating plate 60 through the blanking pipe 56 and the screening cavity 59;

5. at the moment, the motor 17 is started to enable the vibration plate 60 to start vibration screening through the main shaft 18, the driving belt pulley 19, the belt 20, the driven belt pulley 71, the connecting shaft 70, the driving bevel gear 72, the driven bevel gear 73, the driven gear shaft 74, the power frame 62, the rotating base 61 and the fixed base 63, to screen and separate coarse and fine particles, and meanwhile, the main shaft 18 enables the workpiece on the upper side to start to rotate through the gear 27, the inner gear sleeve 26 and the placing plate 25;

6. at the moment, the air pump 34 is started to spray coarse particles in the coarse sand box 66 to the surface of the workpiece rotating on the upper side of the placing plate 25 through the spray head 29 through the air spraying pipe 35, the spray pipe 30, the absorption pipe 32 and the suction pipe 68 to start rough machining, and the pneumatic slide plate 40 is lifted by the large pressure in the spray pipe 30 to disconnect the air flow pipe 36 from the dust falling head 42;

7. when the coarse particles in the coarse sand box 66 are used up, the coarse sand plate 67 is tightly attached to the end of the suction pipe 68 under the action of the spring, and the negative pressure in the suction pipe 32 sucks the resistance block 75 to ensure that the fine particles in the fine sand box 64 start to be sprayed into the spraying cavity 11 for finishing;

8. meanwhile, the pressure in the spray pipe 30 is reduced, the pneumatic sliding plate 40 drives the pneumatic clamping plate 41 to fall down, so that the gas spraying pipe 35 sprays gas into the spraying cavity 11 through the gas flow pipe 36 and the dust falling head 42, and the raised dust in the spraying cavity 11 is reduced and falls down;

9. after the fine particles are sprayed, the motor 17 is stopped, the air pump 34 continues to spray air into the spraying cavity 11 to reduce dust, at the moment, the device is reset, and an operator can open the door 12 to replace the workpiece for continuous processing.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.