A double-sand switching system for a pre-sanding booth of a coating line

Abstract

The utility model relates to a sand blasting room technical field, concretely relates to a kind of coating line front sand blasting room double sand switching system, including back sand pipe, blanking hopper, first switching valve, first sand storage tank, first pipeline, first fan, first pneumatic conveying mechanism, still symmetrically provided with second switching valve, second sand storage tank, second pipeline, second fan, second pneumatic conveying mechanism, the utility model is collected sand by the back sand pipe of common use, blanking hopper, and is provided with two sets of symmetrical sand material processing unit (including sand storage tank, fan, filtration, screening, pneumatic conveying) with independent switching valve in its both ends.By controlling the open-close state of switching valve, sand material in back sand pipe is selectively sucked into corresponding processing unit for recycling, screening, storage and re-supply, so that flexible, pollution-free switching use of two kinds of sand material in single sand blasting station is realized, and by switching back sand system, the type of selected sand material is changed, solving the problem of selecting different sand material for different material workpieces.

Description

Technical Field

[0001] This utility model relates to the field of sandblasting booth technology, specifically to a dual-abrasive material switching system for a pre-coating sandblasting booth. Background Technology

[0002] Sandblasting booths are used in the pre-processing stage of a coating line, primarily for surface treatment of workpieces. After sandblasting, rust on the workpiece surface can be removed, facilitating further coating work. Different abrasives are required for sandblasting depending on the workpiece material. Normally, a single sandblasting booth can only use one type of abrasive. Modern sandblasting booths only support a single type of abrasive. Selecting different abrasives requires multi-station sandblasting booths, resulting in high investment costs, high energy costs, and a large footprint for customers. Utility Model Content

[0003] The problem solved by this utility model is that: selecting different abrasive materials requires multi-station sandblasting rooms, resulting in high investment costs, high energy costs, and large site area for customers. It provides a low-cost dual-abrasive material switching system for a pre-sandblasting room in a coating line that can meet the needs of two types of abrasive materials.

[0004] This utility model is achieved through the following technical solution: a dual sand material switching system for a pre-blasting chamber in a coating line, wherein the return sand pipe is located at the bottom of the blasting chamber and its width is not less than that of the blasting chamber.

[0005] Multiple material discharge hoppers are installed side by side on the return sand pipe, and their conical bottoms are connected to the return sand pipe;

[0006] The first switching valve, installed at the left end of the sand return pipe, can shut off / open the pipes on both sides of the valve;

[0007] The first sand storage box is installed on the bracket and contains sand of the first specification.

[0008] The first pipeline is connected at both ends to the inlet of the first sand storage tank and the first switching valve, respectively.

[0009] The first fan, installed on the first sand storage box, provides suction.

[0010] The first pneumatic conveying mechanism is installed at the discharge port below the first sand storage box;

[0011] The second switching valve, the second sand storage tank, the second pipeline, the second fan, and the second pneumatic conveying mechanism are respectively symmetrically arranged with the first switching valve, the first sand storage tank, the first pipeline, the first fan, and the first pneumatic conveying mechanism, and are installed on the right side of the return sand pipe. The second sand storage tank stores sand of the second specification.

[0012] Furthermore, the discharge hopper is an inverted quadrangular pyramid shape, with the bottom edges of two adjacent discharge hoppers touching.

[0013] Furthermore, the first switching valve and the second switching valve are pneumatic clamp valves.

[0014] Furthermore, a first transition box is provided above the first sand storage box, the bottom of the first transition box is connected to the first sand storage box, the first pipe is connected to the first transition box, the inlet of the first fan extends into the first transition box through the pipe, and a first filter device is provided.

[0015] Furthermore, a second transition box and a second filter device are symmetrically arranged at the second sand storage box.

[0016] Furthermore, an inclined first perforated plate is provided inside the first sand storage box, the diameter of the holes in the first perforated plate is matched with the diameter of the first specification sand, and a first inspection door is provided on the wall panel of the first sand storage box near the low position of the first perforated plate.

[0017] Furthermore, a second perforated plate and a second inspection door are symmetrically provided at the second sand storage box.

[0018] The beneficial effects of this utility model are:

[0019] This utility model describes a dual-abrasive switching system for a pre-blasting booth in a coating line. Abrasive is collected via a shared wide return pipe, with two symmetrical abrasive processing units (including a storage tank, fan, filter, sieve, and pneumatic conveyor) equipped with independent switching valves at both ends. By controlling the opening and closing of the switching valves, abrasive from the return pipe is selectively drawn into the corresponding processing unit for recovery, sieving, storage, and resupply. This allows for flexible and pollution-free switching between two types of abrasive within a single blasting station. This system effectively solves the problems of high investment, high energy consumption, and large footprint associated with traditional multi-station solutions. Furthermore, it optimizes abrasive recovery efficiency, system reliability, abrasive quality, dust control, and ease of maintenance through the use of a hopper, transition box, filter, perforated plate, and inspection door. The switching of the return sand system allows for changing the type of abrasive used, solving the problem of selecting different abrasives for workpieces of different materials. Attached Figure Description

[0020] Figure 1 This is a structural diagram of a dual-abrasive material switching system for a pre-blasting booth in a coating line, as described in this utility model.

[0021] Figure 2 for Figure 1 Enlarged view of the left side of the middle section;

[0022] Figure 3 for Figure 1 Enlarged view of the middle sandblasting pipe and the discharge hopper.

[0023] In the diagram: 1. Return sand pipe; 2. Material discharge hopper;

[0024] 11 First switching valve; 12 First sand storage box; 13 First pipeline; 14 First fan; 15 First pneumatic conveying mechanism; 16 First transition box; 17 First filter device; 18 First orifice plate; 19 First inspection door;

[0025] 21 Second switching valve; 22 Second sand storage box; 23 Second pipeline; 24 Second fan; 25 Second pneumatic conveying mechanism; 26 Second transition box; 27 Second filter device; 28 Second orifice plate; 29 Second inspection door. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] like Figure 1-3 As shown, a dual-abrasive switching system for a pre-blasting booth in a coating line includes a return sand pipe 1 located at the bottom of the blasting booth, with a width not less than that of the blasting booth.

[0028] Multiple material discharge hoppers 2 are installed side by side on the return sand pipe 1, and their conical bottoms are connected to the return sand pipe 1;

[0029] The first switching valve 11 is installed at the left end of the return sand pipe 1 and can shut off / open the pipes on both sides of the valve.

[0030] The first sand storage box 12 is installed on the bracket and stores sand of the first specification.

[0031] The first pipeline 13 is connected at both ends to the inlet of the first sand storage tank 12 and the first switching valve 11, respectively;

[0032] The first fan 14 is installed on the first sand storage box 12 to provide suction;

[0033] The first pneumatic conveying mechanism 15 is installed at the lower outlet of the first sand storage box 12;

[0034] The second switching valve 21, the second sand storage box 22, the second pipeline 23, the second fan 24, and the second pneumatic conveying mechanism 25 are respectively symmetrically arranged with the first switching valve 11, the first sand storage box 12, the first pipeline 13, the first fan 14, and the first pneumatic conveying mechanism 15, and are installed on the right side of the return sand pipe 1. The second sand storage box 22 stores sand of the second specification.

[0035] In this scheme, when the first specification sand is needed, the first switching valve 11 is opened and the second switching valve 21 is closed. The first blower 14 works, generating negative pressure at the left end of the return sand pipe 1 and in the first pipe 13, which sucks the first specification sand in the drop hopper 2 into the first sand storage box 12 for storage. Then, when in use, the first specification sand is supplied to the spray gun through the first pneumatic conveying mechanism 15 and sprayed out in the sandblasting room for use.

[0036] When the second specification sand is needed, the second switching valve 21 is opened and the first switching valve 11 is closed. The second blower 24 works, generating negative pressure at the right end of the return sand pipe 1 and in the second pipe 23, which draws the second specification sand in the drop hopper 2 into the second sand storage box 22 for storage. Then, when in use, the second specification sand is supplied to the spray gun through the second pneumatic conveying mechanism 25 and sprayed out in the sandblasting room.

[0037] This solution allows for the use of two types of abrasive within a single blasting room via a switching valve, achieving dual-abrasive operation at a single station. The wide return pipe 1 and the discharge hopper 2 serve as shared recycling channels for both types of abrasive, eliminating the need for separate recycling systems for each type, simplifying the structure, and reducing costs. Two symmetrical systems ensure complete isolation between the two types of abrasive during storage and supply, preventing cross-contamination. Compared to building two blasting rooms, this significantly reduces equipment investment costs, energy consumption, and requires only one room for lighting, dust removal, and site occupancy costs.

[0038] In practical applications, the discharge hopper 2 is an inverted square pyramid shape, with the base edges of adjacent discharge hoppers 2 touching. This inverted square pyramid design facilitates the smooth flow of sand to the bottom outlet under gravity. The touching base edges of adjacent discharge hoppers 2 mean they are tightly arranged on top of the return sand pipe 1, covering the entire width of the return sand pipe 1 without gaps. This ensures that all sand falling from all areas of the sandblasting booth floor can be collected by the discharge hopper 2, improving sand recovery rate and reducing waste.

[0039] In practical applications, the first switching valve 11 and the second switching valve 21 are pneumatic pinch valves. Pneumatic pinch valves achieve complete shut-off or open-off of the pipeline by using a pneumatic actuator to compress the inner wall of the rubber sleeve. They do not have valve cores or other components directly contacting the flowing material. They are ideal for controlling gas-solid two-phase flow containing sand, where the sand primarily wears down the replaceable rubber sleeve rather than the expensive valve body, extending valve life and reducing maintenance costs. When open, they provide an unobstructed flow path, reducing flow resistance and energy consumption; when closed, they provide a reliable seal. Maintenance is relatively simple compared to other valves.

[0040] In practical applications, a first transition box 16 is provided above the first sand storage box 12. The bottom of the first transition box 16 is connected to the first sand storage box 12. The first pipe 13 is connected to the first transition box 16. The inlet of the first fan 14 extends into the first transition box 16 through the pipe and is provided with a first filter device 17.

[0041] In this design, the first transition chamber 16 is located at the top of the first sand storage tank 12 and serves as the inlet chamber of the first pipe 13. The sand-laden airflow first enters the first transition chamber 16. Due to the sudden increase in volume of the first transition chamber 16, the airflow velocity drops sharply, and most of the sand initially settles into the first sand storage tank 12 below under gravity and inertia. Lighter dust and a small amount of fine sand rise with the airflow and are captured by the first filter device 17 located before the blower inlet. The filtered clean air is then discharged by the blower. The first transition chamber 16 provides a buffer space, allowing most of the sand to initially separate and settle into the first sand storage tank 12, reducing the load on the rear first orifice plate 18.

[0042] In practical applications, a second transition box 26 and a second filter device 27 are symmetrically arranged at the second sand storage box 22. Their functions are the same as those of the first transition box 16 and the first filter device 17.

[0043] In practical applications, the first sand storage box 12 is provided with an inclined first perforated plate 18, the diameter of the holes in the first perforated plate 18 is matched with the diameter of the first specification sand, and a first inspection door 19 is provided on the wall panel of the first sand storage box 12 near the low position of the first perforated plate 18.

[0044] In this design, the first perforated plate 18 is installed at an angle inside the first sand storage box 12, and the recovered sand falls to the higher end of the perforated plate. Sand that meets specifications (diameter smaller than the orifice diameter) passes through the first perforated plate 18 and falls into the bottom storage area of ​​the first sand storage box 12 for later use. Oversized sand, impurities, and agglomerated sand are intercepted by the first perforated plate 18 and slide down to the lower end of the first perforated plate 18 due to the angle of inclination and gravity, accumulating there. The first inspection door 19 is located on the wall panel of the first sand storage box 12 corresponding to the accumulation area at the lower end of the first perforated plate 18. Opening the first inspection door 19 allows for convenient cleaning of oversized particles and impurities intercepted by the first perforated plate 18. The first perforated plate 18 performs online screening of the recovered sand, automatically removing oversized particles, impurities, and agglomerated sand, ensuring that the sand particle size supplied to the spray gun meets the requirements, maintaining the quality and efficiency of sandblasting. Gravity is used to achieve automatic collection of impurities, improving screening and cleaning efficiency. Furthermore, the first inspection door 19 can be opened to clear obstructions at any time, greatly reducing maintenance time and workload and improving equipment availability.

[0045] In practical applications, a second perforated plate 28 and a second inspection door 29 are symmetrically arranged at the second sand storage box 22. Similarly, the aperture of the second perforated plate 28 filters the second specification of sand, ensuring that the particle size of the sand supplied to the spray gun meets the requirements and maintaining the sandblasting quality and efficiency.

[0046] In summary, the dual-abrasive switching system for a pre-blasting booth in a coating line described in this utility model collects abrasive through a shared wide return pipe 1, and sets two symmetrical abrasive processing units (including a sand storage box, fan, filter, sieve, and pneumatic conveyor) with independent switching valves at both ends. By controlling the opening and closing of the switching valves, the abrasive in the return pipe 1 is selectively drawn into the corresponding processing unit for recovery, sieving, storage, and resupply, thereby achieving flexible and pollution-free switching between two types of abrasive within a single blasting station. This system effectively solves the problems of high investment, high energy consumption, and large footprint associated with traditional multi-station solutions. Through detailed design of the discharge hopper 2, transition box, filter device, perforated plate, and inspection door, it optimizes abrasive recovery efficiency, system reliability, abrasive quality, dust control, and ease of maintenance.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that the above embodiments are only for illustrating the technical concept and characteristics of this utility model, and are intended to enable those skilled in the art to understand and implement the content of this utility model. They should not be used to limit the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A dual-abrasive switching system for a pre-blasting booth in a coating line, characterized in that: include: The return sand pipe (1) is located at the bottom of the sandblasting room and its width is not less than that of the sandblasting room; Multiple material hoppers (2) are installed side by side on the return sand pipe (1), and their conical bottoms are connected to the return sand pipe (1); The first switching valve (11) is installed at the left end of the return sand pipe (1) and can shut off / open the pipes on both sides of the valve; The first sand storage box (12) is installed on the bracket and contains sand of the first specification. The first pipeline (13) is connected at both ends to the inlet of the first sand storage tank (12) and the first switching valve (11); The first blower (14) is installed on the first sand storage box (12) to provide suction; The first pneumatic conveying mechanism (15) is installed at the lower outlet of the first sand storage box (12); The second switching valve (21), the second sand storage box (22), the second pipeline (23), the second fan (24), and the second pneumatic conveying mechanism (25) are respectively symmetrically arranged with the first switching valve (11), the first sand storage box (12), the first pipeline (13), the first fan (14), and the first pneumatic conveying mechanism (15), and are installed on the right side of the return sand pipe (1). The second sand storage box (22) stores sand of the second specification.

2. The dual-abrasive material switching system for a pre-blasting booth in a coating line according to claim 1, characterized in that: The discharge hopper (2) is an inverted quadrangular pyramid shape, with the bottom edges of two adjacent discharge hoppers (2) touching.

3. The dual-abrasive switching system for a pre-blasting booth in a coating line according to claim 1, characterized in that: The first switching valve (11) and the second switching valve (21) are pneumatic clamp valves.

4. The dual-abrasive switching system for a pre-blasting booth in a coating line according to claim 1, characterized in that: A first transition box (16) is provided above the first sand storage box (12). The bottom of the first transition box (16) is connected to the first sand storage box (12). The first pipe (13) is connected to the first transition box (16). The inlet of the first fan (14) extends into the first transition box (16) through the pipe and is provided with a first filter device (17).

5. A dual-abrasive material switching system for a pre-blasting booth in a coating line according to claim 4, characterized in that: A second transition box (26) and a second filter device (27) are symmetrically arranged at the second sand storage box (22).

6. The dual-abrasive switching system for a pre-blasting booth in a coating line according to claim 1, characterized in that: An inclined first perforated plate (18) is provided inside the first sand storage box (12). The diameter of the holes in the first perforated plate (18) matches the diameter of the first specification sand. A first inspection door (19) is provided on the wall panel of the first sand storage box (12) near the low position of the first perforated plate (18).

7. A dual-abrasive material switching system for a pre-blasting booth in a coating line according to claim 6, characterized in that: A second perforated plate (28) and a second inspection door (29) are symmetrically provided at the second sand storage box (22).

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