Combined circulating sandblasting apparatus

Abstract

Disclosed in the present invention is a combined circulating sandblasting apparatus, comprising a sandblasting system, a sand storage system, an abrasive recovery system and an electronic control system, wherein the sandblasting system comprises a first outer frame and a sandblaster, and four sandblasting guns can be connected to the bottom of the sandblaster; the sand storage system comprises a sand storage box and a second outer frame, and a flip-type manhole is provided at the top of the sand storage box; and the abrasive recovery system is composed of a dust removal fan, a dust-pellet separator, a vacuum abrasive recovery box and a bucket elevator. The key technical points are as follows: the combined circulating sandblasting apparatus is designed with a three-part modular mounting mode, and the width dimension of each module is effectively controlled to facilitate land transportation and meet the placement requirements on various ship decks, thereby realizing efficient land transfer; the apparatus has the functions such as abrasive recovery, dust removal, and automatic waste cleaning, which saves the abrasive use cost, reduces the generation of solid waste, and thus reduces the hoisting and transfer cost; and a dust remover is used for removing dust, which also greatly contributes to the occupational health of workers.

Description

Combined circulating sand blasting equipment TECHNICAL FIELD

[0001] The present application relates to the technical field of sand blasting equipment, in particular to a combined circulating sand blasting equipment. BACKGROUND

[0002] Sand blasting is a process of cleaning and roughening the surface of the substrate by using the impact of high-speed sand flow. Sand blasting machine is the most widely used product of abrasive jet. Sand blasting machine is generally divided into two categories: dry sand blasting machine and liquid sand blasting machine. Dry sand blasting machine can be divided into two categories: suction type and pressure type. Sand blasting uses compressed air as power to form a high-speed jet beam to spray the abrasive (copper ore sand, quartz sand, corundum sand, iron sand, Hainan sand) onto the surface of the workpiece to be processed, so that the appearance or shape of the workpiece surface changes. Sand blasting is a widely used method for surface treatment and cleaning. Traditional ship cabin sand blasting uses a sand blasting machine for sand blasting and rust removal. The abrasive is generally copper ore sand.

[0003] The copper ore sand has large dust, and the abrasive recovery operation needs to use a sand suction machine (Roots blower) and a sand recovery hopper to cooperate. A large amount of solid waste is generated during abrasive recovery, which needs to be frequently lifted and emptied by a crane. In addition, the copper ore sand has a high crushing rate, and after a single sand blasting operation, there is a lot of dust and impurities, which is mostly disposable. The entire operation process requires a lot of manpower and resources.

[0004] Therefore, it is necessary to design a circulating sand blasting equipment that meets the requirements of using steel sand abrasive for sand blasting and rust removal, has the functions of abrasive recovery, dust removal, and automatic waste cleaning, and also considers the transportation of the equipment, meets the requirements of placing on various ship decks, and has a small size, to solve the above problems. SUMMARY

[0005] Technical problems solved:

[0006] In view of the deficiencies of the prior art, the present application provides a combined circulating sand blasting equipment, which is designed in a three-part modular installation mode, and the width size of each module is effectively controlled, facilitating land transportation, meeting the requirements of placing on various ship decks, and realizing efficient land transfer. The equipment has the functions of abrasive recovery, dust removal, and automatic waste cleaning, saves the cost of abrasive use, reduces the generation of solid waste, and further reduces the cost of lifting and transferring. The dust collector helps the occupational health of workers, and solves the technical problems mentioned in the background art. Technical scheme

[0007] To achieve the above purpose, the present application is realized by the following technical scheme:

[0008] The combined circulating sand blasting equipment comprises a sand blasting system, a sand storage system, an abrasive material recovery system and an electric control system, the sand blasting system, the sand storage system and the abrasive material recovery system are designed as three modular installation modes, the width size of each module is controlled within 2.4 m, so as to facilitate land transportation and satisfy various ship deck placement, the sand blasting system comprises a first external frame and a sand blasting machine, the bottom of the sand blasting machine can be connected with four sand blasting guns, the sand storage system comprises a sand storage tank and a second external frame, the top of the sand storage tank is provided with a flip manhole, the flip manhole is convenient for operators to observe and maintain and use, and is beneficial to the maintenance operation, the abrasive material recovery system is composed of a dust removal fan, a dust pellet separator, an abrasive material vacuum recovery tank and a bucket elevator, the dust pellet separator is provided with a dust remover on the side, the dust pellet separator comprises a separator main body, and the separator main body is composed of a rolling screening device and an air dust suction device, the abrasive material vacuum recovery tank is a double-station double-bin sand suction tank, which is vertically divided into three chambers, the upper chamber is a sand suction and filtration tank, the middle chamber is a feeding bin, and the lower chamber is a discharging bin, a radio frequency material level instrument is installed on the tank body of the abrasive material vacuum recovery tank, air cylinder valves are arranged at the lower ends of the feeding bin and the discharging bin, the electric control system is used for controlling the sand blasting system, the sand storage system and the abrasive material recovery system, the radio frequency material level instrument installed on the tank body detects the recovery condition of the abrasive material in the tank, transmits signals to a programmable controller, and performs program operation by the programmable controller to control the action of the air cylinder valves of the two bins to realize automatic discharging, when the abrasive material recovery operation is performed, the discharging bin is closed, the feeding bin is opened, the abrasive material is recovered, after the radio frequency material level instrument detects that the abrasive material is full, the abrasive material release link is entered, the feeding bin is closed, the discharging bin is opened, and the vacuum destruction valve of the discharging bin is opened, the abrasive material in the feeding bin falls into the discharging bin and slides into the abrasive material screening machine, and the continuous abrasive material recovery of the feeding bin is not affected, after the abrasive material discharge outlet is controlled according to time, the discharging bin is closed, the feeding bin is opened, the vacuum bypass valve is opened, air is discharged, the abrasive material vacuum recovery tank is restored to the vacuum environment of the double bin, and the continuous abrasive material recovery is performed.

[0009] In a possible implementation, the first external frame and the second external frame are both constructed by square tube assemblies, and the first external frame and the second external frame each comprise a square steel, a flat steel, a rectangular tube or a channel steel.

[0010] In a possible implementation, a container corner fitting is welded to each of the eight corner points of the first external frame and the second external frame, and the container corner fitting facilitates hoisting, carrying and fixing of the equipment and facilitates modular installation.

[0011] In a possible implementation, the top of the sand suction and filtration tank is provided with a sand blocking plate and a vacuum pipe interface, and continuous abrasive material recovery is realized without stopping.

[0012] In a possible implementation, the lower part of the suction sand filter box is provided with a suction sand port, the abrasive vacuum recovery box is a double-station double-bin suction sand box vertically divided into three chambers, the upper part is the suction sand filter box, the middle part is the feeding bin, the lower part is the discharging bin, the top pipeline is connected with the suction sand machine, the special Roots blower, and the lower port is the sand inlet for recovering the abrasive, and two suction sand machines can be connected to work simultaneously or at different times, and six-way door covers are installed at the opening positions.

[0013] In a possible implementation, the abrasive recovery system comprises a bottom plate, the dust removal fan, the dust and abrasive separator, the abrasive vacuum recovery box and the bucket elevator are all installed on the bottom plate, the bottom part of the bucket elevator is provided with an anti-slip device, the bucket elevator can realize slip alarm by detecting the rotating part, the system alarm is divided into ordinary alarm and important alarm, the ordinary alarm is prompted by the indicator light and the buzzer, and the important alarm immediately stops and sends an alarm.

[0014] In a possible implementation, the top part of the bucket elevator is provided with a maintenance platform, the maintenance platform is arranged to facilitate the maintenance and repair of the head motor, the speed reducer and other accessories of the bucket elevator, and a safety guardrail is installed on the maintenance platform to improve the safety during maintenance and repair.

[0015] In a possible implementation, the dust and abrasive separator mainly comprises a feeding port, a spiral conveyor, a rolling screen, a dust suction port, a discharging port and a large-particle waste outlet, the discharging port is used for discharging the separated large-particle waste and the screened abrasive, the material generated in the sand blasting process enters the separator main body of the dust and abrasive separator through the feeding port and the spiral blade, in the separator main body of the dust and abrasive separator, the material is first screened by the rolling screen to screen out the large-particle abrasive, the screened material enters the air separation device, the dust and the abrasive are separated by the air separation device through the gravity air separation principle, and finally the separated dust and abrasive are discharged from different discharging ports, the dust is discharged from the waste outlet, and the abrasive is recycled.

[0016] In a possible implementation, the electric control system comprises a hardware part and a software part.

[0017] In a possible implementation, the hardware part includes a power module and a programmable controller, the rolling screen in the dust pellet separator is driven by a frequency converter, the motors of the screw conveyor, dust collector and bucket elevator are controlled by power frequency, and are matched with contactors and intermediate relays, the power module adopts a Mingwei 24V5.5A direct-current power supply, the programmable controller adopts a Siemens S7-200 SMARTSR30, the rolling screen in the dust pellet separator is driven by a Delta MS300 frequency converter, the running speed of the rolling screen can be adjusted according to the size of the abrasive, the motors of the screw conveyor, dust collector and bucket elevator are controlled by power frequency, and are matched with Schneider contactors and Schneider intermediate relays, pneumatic elements adopt Yaskawa, abrasive detection adopts a radio frequency material level instrument, a plurality of emergency stop switches are installed on the periphery and the body of the electric cabinet, the equipment can be immediately stopped when an emergency occurs, the program is written according to the working process of the equipment, the equipment has two control modes of full-automatic control and semi-automatic control, the full-automatic control can realize one-key starting and joint operation of the equipment, and the semi-automatic control can realize single operation of the equipment, which is convenient for maintenance and debugging.

[0018] Compared with the prior art, the application has the following beneficial effects:

[0019] The application is designed as a three-part modular installation mode, and the width size of each module is effectively controlled, facilitating land transportation, meeting the placement of various ship decks, realizing efficient land transfer, four-corner welding container corner fittings, using set container corner fitting twist lock connection, and facilitating installation.

[0020] The abrasive screening mechanism in the abrasive recycling system can effectively screen the abrasive and remove large particle impurities, and the abrasive can be recycled, which promotes the upgrading of the production process of replacing disposable abrasive with recyclable steel sand abrasive in copper ore sand, greatly saves the abrasive use cost, reduces the generation of solid waste, and makes a great contribution to green environmental protection.

[0021] The application has the functions of abrasive recycling, dust removal, automatic waste cleaning and the like, the use of the circulating abrasive sand equipment reduces the generation of solid waste, and further reduces the hoisting and transfer cost, and since the dust collector is provided, the dust collector effectively removes dust, which is of great help to the occupational health of the sandblasting workers.

[0022] 4, The hardware part and the software part of the electric control system realize full-automatic control and semi-automatic control of the whole equipment, a plurality of emergency stop switches are installed on the periphery and the body of the electric cabinet, the equipment can be immediately stopped when an emergency occurs, the bucket elevator can realize slip alarm, and the use safety of the whole equipment is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above description is only a summary of the technical scheme of the present application. In order to make the technical means of the present application more clearly understood and implemented according to the content of the description, the preferred embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0024] Fig. 1 is a schematic diagram of the overall structure of the present application;

[0025] Fig. 2 is a front view of the overall structure of the present application;

[0026] Fig. 3 is a schematic diagram of the structure of the sand blasting system of the present application;

[0027] Fig. 4 is a schematic diagram of the structure of the first external frame of the present application;

[0028] Fig. 5 is a schematic diagram of the structure of the sand storage system of the present application;

[0029] Fig. 6 is a schematic diagram of the structure of the abrasive material recovery system of the present application;

[0030] Fig. 7 is a side view of the abrasive material recovery system of the present application;

[0031] Fig. 8 is a schematic diagram of the structure of the abrasive material vacuum recovery tank of the present application;

[0032] Fig. 9 is a front view of the abrasive material vacuum recovery tank of the present application;

[0033] Fig. 10 is a schematic diagram of the internal structure of the abrasive material vacuum recovery tank of the present application;

[0034] Fig. 11 is an A-A sectional view of the present application;

[0035] Fig. 12 is a schematic diagram of the structure of the air cylinder valve of the present application;

[0036] Fig. 13 is an electrical schematic diagram 1 of the present application;

[0037] Fig. 14 is an electrical schematic diagram 2 of the present application;

[0038] Fig. 15 is an electrical schematic diagram 3 of the present application.

[0039] In the drawings: 1, sand blasting system; 2, sand storage system; 3, abrasive material recovery system; 11, first external frame; 12, sand blasting machine; 111, square tube assembly; 112, container corner fitting; 21, sand storage tank; 22, second external frame; 211, flip manhole; 31, bottom plate; 32, dust removal fan; 33, dust pellet separator; 34, abrasive material vacuum recovery tank; 35, bucket elevator; 341, sand suction filter tank; 342, upper feeding bin; 343, lower discharging bin; 344, air cylinder valve; 3411, sand blocking plate; 3412, vacuum pipe interface; 3413, sand suction port; 351, maintenance platform. DETAILED DESCRIPTION

[0040] The embodiment of the application provides a combined circulating sand blasting device, which is designed in a three-part modular installation mode, the width size of each module is effectively controlled, land transportation is facilitated, various ship decks can be placed, efficient land transfer can be realized, the device has the functions of abrasive recycling, dust removal, automatic waste cleaning and the like, abrasive use cost is saved, solid waste generation is reduced, hoisting and transfer cost is reduced, dust removal is performed by the dust remover, the professional health of workers is greatly helped, and the technical problems mentioned in the background art are solved.

[0041] The technical solutions in the embodiment of the application are as follows to solve the problems in the background art: Embodiment 1:

[0042] Please refer to FIGS. 1-15, the application provides a technical solution: a combined circulating sand blasting device, comprising a sand blasting system 1, a sand storage system 2, an abrasive recycling system 3 and an electric control system, abrasive is stored in the sand storage system 2 and enters the sand blasting system 1 through the sand storage system 2, the sand blasting system 1 is connected with a sand blasting gun for sand blasting operation, used abrasive is recycled and filtered by the abrasive recycling system 3 for recycling, the sand blasting system 1 comprises a first external frame 11 and a sand blasting machine 12, the sand blasting machine 12 is a manual sand blasting machine 12, and the bottom of the sand blasting machine 12 can be connected with four sand blasting guns, the sand storage system 2 comprises a sand storage tank 21 and a second external frame 22, the sand storage tank 21 has a capacity of twelve cubic meters, the top of the sand storage tank 21 is provided with a flip type manhole 211, the flip type manhole 211 facilitates observation and maintenance by an operator, and is beneficial to maintenance operation, the abrasive recycling system 3 comprises a dust removal fan 32, a dust pellet separator 33, an abrasive vacuum recycling tank 34 and a bucket elevator 35, a dust remover is installed on the side of the dust pellet separator 33, the dust pellet separator 33 comprises a separator main body, and the separator main body comprises a rolling screening device and an air dust suction device, the abrasive vacuum recycling tank 34 is a double-station double-bin sand suction tank, which is vertically divided into three chambers, the upper chamber is a sand suction and filtering tank 341, the middle chamber is a feeding bin 342, and the lower chamber is a discharging bin 343, a radio frequency material level instrument is installed on the tank body of the abrasive vacuum recycling tank 34, a pneumatic cylinder valve 344 is arranged at the lower end of the feeding bin 342 and the discharging bin 343, and the electric control system is used for controlling the sand blasting system 1, the sand storage system 2 and the abrasive recycling system 3.

[0043] The sand blasting system 1, the sand storage system 2 and the abrasive recycling system 3 are designed in a three-part modular installation mode, the width size of each module is controlled to be less than or equal to 2.4 m, the width size of each module is effectively controlled, land transportation is facilitated, various ship decks can be placed, the corners of the first external frame 11 and the second external frame 22 are welded with container corner fittings 112, and the container corner fittings 112 are connected by twist locking.

[0044] In some examples, the first external frame 11 and the second external frame 22 are both constructed by square tube assemblies 111, and the first external frame 11 and the second external frame 22 both include square steel, flat steel, rectangular tube, channel steel, and the second external frame 22 further includes steel plate, angle steel, waterproof surrounding edge, movable railing base, and the first external frame 11 further includes triangular plate and steel plate, and the structural members of the first external frame 11 are welded and fixed together, and the structural members of the second external frame 22 are welded and fixed together.

[0045] In some examples, the eight corner points of the first external frame 11 and the second external frame 22 are all welded with container corner fittings 112, which is convenient for lifting, carrying and fixing the equipment and facilitates the modular installation.

[0046] In some examples, the top of the sand suction filter box 341 is provided with a sand blocking plate 3411 and a vacuum pipe interface 3412 to realize continuous abrasive recovery without stopping.

[0047] In some examples, the lower part of the sand suction filter box 341 is provided with a sand suction port 3413.

[0048] The abrasive vacuum recovery box 34 is a double-station double-bin sand suction box vertically divided into three chambers, the upper part is a sand suction filter box 341, the middle part is a feeding bin 342, and the lower part is a discharging bin 343, the top pipeline is connected with a sand suction machine and a special Roots blower, and the lower pipe port is a sand inlet for recovering abrasive, which can be connected with two sand suction machines to work simultaneously or at different times, and six-way door covers are installed at the opening positions.

[0049] Working principle of the abrasive vacuum recovery box 34:

[0050] The abrasive vacuum recovery box 34 is a double-station double-bin abrasive recovery box, which is a continuous working sand suction box. The sand suction box is automatically discharged and controlled. A radio frequency material level instrument is installed in the box to detect the recovery of abrasive in the box, and the signal is transmitted to a programmable controller for program operation to control the action of two bin air cylinder valves 344 to realize automatic discharge.

[0051] Specific working steps of the abrasive vacuum recovery box 34:

[0052] During abrasive recovery, the discharging bin 343 is closed, the feeding bin 342 is opened, and the abrasive is recovered. After the radio frequency material level instrument detects that the abrasive is full, the abrasive release link is entered, the feeding bin 342 is closed, the discharging bin 343 is opened, and the discharging bin 343 vacuum destruction valve is opened at the same time. The abrasive in the feeding bin 342 will fall into the discharging bin 343 and slide into the abrasive screening machine, and the continuous abrasive recovery of the feeding bin 342 is not affected.

[0053] According to the time control abrasive outlet, the lower discharge bin 343 is closed, the upper discharge bin 342 is opened, and the vacuum bypass valve is opened, which is more direct to exhaust air, so that the abrasive vacuum recovery tank 34 returns to the vacuum environment of the double bin, and the abrasive is continuously recovered.

[0054] In some examples, the abrasive recovery system 3 includes a base plate 31, a dust removal fan 32, a dust ball separator 33, an abrasive vacuum recovery tank 34 and a bucket elevator 35, and the dust removal fan 32, the dust ball separator 33 and the abrasive vacuum recovery tank 34 are installed on the base plate 31. The bottom of the bucket elevator 35 is provided with an anti-skid device.

[0055] Among them, the abrasive vacuum recovery tank 34 continuously recovers the abrasive, the dust removal fan 32 cooperates with the dust collector and the dust ball separator 33, and separates the dust and the abrasive by air force, and finally the separated dust and abrasive are discharged into different discharge ports, realizing the separation of dust and ball.

[0056] In some examples, the top of the bucket elevator 35 is provided with a maintenance platform 351, which is provided for the convenience of maintenance and maintenance of the head motor, speed reducer and other accessories of the bucket elevator 35. The safety guardrail is installed and fixed on the maintenance platform 351 to improve the safety during maintenance and maintenance.

[0057] In some examples, the dust ball separator 33 mainly consists of a feed port, a spiral conveyor, a rolling screen, a dust suction port, a discharge port and a large particle waste outlet, and the discharge port is used to discharge the separated large particle waste and the screened abrasive.

[0058] The working principle of the dust ball separator 33 is as follows:

[0059] The material generated during the sand blasting process enters the separator main body of the dust ball separator 33 through the feed port by the spiral blade. In the separator main body of the dust ball separator 33, the material is first screened by the rolling screen to screen out large particle abrasives. The screened material enters the air separation device, which separates the dust and the abrasive by air force according to the principle of gravity air separation. Finally, the separated dust and abrasive are discharged into different discharge ports, realizing the separation of dust and ball. The dust flows out through the waste outlet, and the abrasive is recycled.

[0060] By adopting the above technical scheme:

[0061] The design is a three-part modular installation method, and the width of each module is effectively controlled, which is convenient for land transportation and meets the requirements of various ship decks. The four-corner welded container corner fittings 112 are connected by using the container corner fitting twist lock, which is beneficial to installation.

[0062] The abrasive screening mechanism in the abrasive recycling system 3 can effectively screen the abrasive and remove large-particle impurities, and the abrasive can be recycled, which promotes the upgrading of the production process of replacing disposable copper ore sand abrasive with recyclable steel sand abrasive, greatly saves the use cost of abrasive, reduces the generation of solid waste, and makes a great contribution to green environmental protection.

[0063] The device has the functions of abrasive recycling, dust removal, automatic waste cleaning, etc., and the use of the circulating abrasive sand device reduces the generation of solid waste, thereby reducing the cost of hoisting and transportation. Since the device is equipped with a dust remover, the dust remover effectively removes dust, which is also helpful to the occupational health of the sandblasting workers. Embodiment 2

[0064] Based on embodiment 1, this embodiment introduces the specific structure of the electric control system in the combined circulating sandblasting device. The electric control system includes a hardware part and a software part.

[0065] In some examples, the hardware part includes a power module and a programmable controller. The rolling screen in the dust pellet separator 33 is driven by a frequency converter, the motors of the screw conveyor, the dust remover, and the bucket elevator 35 are controlled by power frequency, and are matched with contactors and intermediate relays. The dust remover is a bag-type dust remover.

[0066] The hardware part: the power module uses Mingwei 24V5.5A DC power, the programmable controller uses Siemens S7-200 SMARTSR30, the rolling screen in the dust pellet separator 33 is driven by Delta MS300 frequency converter, which can adjust the rolling screen running speed according to the size of the abrasive, the motors of the screw conveyor, the dust remover, and the bucket elevator 35 are controlled by power frequency, and are matched with Schneider contactors and Schneider intermediate relays, the pneumatic elements use Yadea, the abrasive detection uses a radio frequency material level instrument, and multiple emergency stop switches are installed on the periphery and the electric cabinet body. When an emergency occurs, the device can be stopped immediately.

[0067] Software part: according to the working process of the device, the program is written, and the device has two control modes of full-automatic control and semi-automatic control.

[0068] Full-automatic control can realize one-key starting and joint operation of each device, and semi-automatic control can realize separate operation of each device, which is convenient for maintenance and debugging.

[0069] Among them, the bucket elevator 35 can realize slip alarm by detecting the rotating parts. The system alarm is divided into ordinary alarm and important alarm. The ordinary alarm is prompted by indicator light and buzzer, and the important alarm immediately stops and sends an alarm.

[0070] By adopting the above technical scheme:

[0071] The hardware part and the software part of the electric control system realize the full automatic control and semi-automatic control of the whole device;

[0072] The peripheral and the cabinet body are provided with multiple emergency stop switches, the device can be immediately stopped when an emergency occurs, the bucket elevator 35 can realize slip alarm, and the use safety of the whole device is improved.

[0073] Finally, it should be noted that: apparently, the above examples are merely for clearly illustrating the present application, and not limited to the implementation. For those skilled in the art, on the basis of the above description, other different forms of changes or variations can also be made. Here, it is not necessary and also impossible to exhaust all the implementations. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A combined circulating sand blasting device, comprising a sand blasting system (1), a sand storage system (2), an abrasive material recovery system (3) and an electric control system, characterized in that: The sand blasting system (1) comprises a first external frame (11) and a sand blasting machine (12), and the bottom of the sand blasting machine (12) can be connected with four sand blasting guns, the sand storage system (2) comprises a sand storage box (21) and a second external frame (22), the top of the sand storage box (21) is provided with a flip manhole (211), the abrasive recovery system (3) is composed of a dust removal fan (32), a dust pellet separator (33), an abrasive vacuum recovery box (34) and a bucket elevator (35), a dust remover is installed on the side of the dust pellet separator (33), the dust pellet separator (33) comprises a separator main body, and the separator main body is composed of a rolling screening device and an air suction device, the abrasive vacuum recovery box (34) is a double-station double-bin sand suction box, which is vertically divided into three chambers, the upper chamber is a sand suction and filtering box (341), the middle chamber is a feeding bin (342), and the lower chamber is a discharging bin (343), a radio frequency material level instrument is installed on the box body of the abrasive vacuum recovery box (34), a pneumatic cylinder valve (344) is arranged at the lower end of the feeding bin (342) and the discharging bin (343), and the electric control system is used for controlling the sand blasting system (1), the sand storage system (2) and the abrasive recovery system (3).

2. A combined circulating sand blasting apparatus according to claim 1, characterized in that: The first external frame (11) and the second external frame (22) are both constructed by square tube assemblies (111), and the first external frame (11) and the second external frame (22) both comprise square steels, flat steels, rectangular tubes and channel steels.

3. A combination circulating sand blasting apparatus as defined in claim 1, wherein: Container corner fittings (112) are welded to the eight corner points of the first external frame (11) and the second external frame (22).

4. A combination circulating sand blasting apparatus as defined in claim 1, wherein: A sand blocking plate (3411) and a vacuum pipe interface (3412) are arranged at the top of the sand suction and filtering box (341).

5. A combination circulating sand blasting apparatus as defined in claim 1, wherein: A sand suction port (3413) is arranged at the lower part of the sand suction and filtering box (341).

6. A combination circulating sand blasting apparatus as defined in claim 1, wherein: The abrasive recovery system (3) comprises a bottom plate (31), and the dust removal fan (32), the dust pellet separator (33), the abrasive vacuum recovery box (34) and the bucket elevator (35) are all installed on the bottom plate (31), and an anti-skid device is arranged at the bottom of the bucket elevator (35).

7. A combination circulating sand blasting apparatus as defined in claim 1, wherein: A maintenance platform (351) is arranged at the top of the bucket elevator (35).

8. A combination circulating sand blasting apparatus as defined in claim 1, wherein: The dust pellet separator (33) mainly comprises a feeding port, a spiral conveyor, a rolling screen, a dust suction port, a discharging port and a large-particle waste outlet, and the discharging port is used for discharging large-particle waste after separation and abrasive after screening.

9. A combined circulating sand blasting apparatus according to claim 8, characterized in that: The electric control system comprises a hardware part and a software part.

10. A combined circulating sand blasting apparatus according to claim 9, characterized in that: The hardware part comprises a power module and a programmable controller, the rolling screen in the dust pellet separator (33) is driven by a frequency converter, and the motors of the spiral conveyor, the dust remover and the bucket elevator (35) are all controlled by power frequency, and are matched with contactors and intermediate relays.

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