Sand blasting room with sand returning function

Abstract

The utility model provides a sand blasting room with back sand function, including sand blasting room body, sand blasting room body bottom board is by the back sand hopper of continuous arrangement, and back sand hopper bottom opening is connected through pipeline and sand dust sorting system of being equipped with sand blasting room body outside. Sand blasting system is equipped with sand blasting room body outside, and sand dust sorting system is connected through pipeline and the sand storage tank of sand blasting system, and sand blasting system receives the sand material of sand dust sorting system processing recovery. Sand blasting system is connected through pipeline and the sand blasting gun. Sand blasting room body top is equipped with liftable roof, and liftable roof is equipped with air inlet, and air inlet is communicated through folding hose and external air source. Sand blasting room body bottom is equipped with exhaust port, and exhaust port is communicated with dust removal system through folding hose and being equipped with sand blasting room body outside. The utility model sets up the back sand hopper of continuous arrangement and ensures that the abrasive after use is all collected. Set up liftable roof and adjust the height in the room flexibly, reduce the air volume demand of ventilation system, reduce the energy consumption of fan.

Description

Technical Field

[0001] This utility model belongs to the field of sandblasting technology, specifically relating to a sandblasting room with a sand return function. Background Technology

[0002] A sandblasting booth is an industrial device widely used for cleaning, rust removal, decontamination, and strengthening of workpiece surfaces. Its core working principle is to use a high-speed spray gun to propel abrasive particles onto the workpiece surface, thereby achieving the desired treatment. Existing sandblasting booths generally employ a fixed-height roof structure. To accommodate large or extra-tall workpieces (such as wind turbine blades, ship sections, and large steel structures), the booth must be constructed exceptionally tall. However, when processing standard-sized or smaller workpieces, this enormous space results in significant resource waste. The excessively large booth space means a dramatic increase in the airflow required by the ventilation system to maintain the necessary negative pressure and dust removal capacity, directly leading to a surge in fan energy consumption and a significant increase in operating costs. Furthermore, existing sandblasting booths place the air inlet and outlet on the side wall of the booth, easily creating airflow short-circuit or vortex dead zones within the booth, resulting in some areas where dust cannot be effectively extracted. Moreover, although bottom-mounted abrasive recovery hoppers are a common design feature, many existing hopper designs are flawed. For example, if the bucket wall angle is too small or there are dead angles, the abrasive material can easily accumulate and stick to the bucket wall, preventing it from smoothly sliding to the recovery port and causing blockages. This not only interrupts continuous production but also requires frequent manual cleaning, increasing maintenance costs and downtime.

[0003] Therefore, the above problems urgently need to be solved. Utility Model Content

[0004] Purpose of the utility model: In order to overcome the above shortcomings, this utility model provides a sandblasting room with a sand return function. By setting up a sand and dust separation system, a sandblasting system, and a sand return hopper to form an abrasive circulation, reusable abrasive and impurities are separated, realizing the recycling of abrasive and reducing consumption costs.

[0005] Technical Solution: To achieve the above objectives, this utility model provides a sandblasting chamber with a sand return function, comprising a sandblasting chamber body. The bottom plate of the sandblasting chamber body is composed of continuously arranged sand return hoppers. The bottom openings of the sand return hoppers are connected to a sand and dust separation system located outside the sandblasting chamber body via pipelines. A sandblasting system is located outside the sandblasting chamber body. The sand and dust separation system is connected to the sand storage tank of the sandblasting system via pipelines, and the sandblasting system receives the sand recovered by the sand and dust separation system. The sandblasting system is connected to a spray gun located inside the sandblasting chamber body via pipelines. The top of the sandblasting chamber body is equipped with a liftable roof plate, and the liftable roof plate has an air inlet, which is connected to an external air source via a folded flexible hose. The bottom of the sandblasting chamber body is equipped with an exhaust port, which is connected to a dust removal system located outside the sandblasting chamber body via a folded flexible hose.

[0006] This invention features a continuously arranged sand return hopper that covers the bottom plate of the blasting chamber without any dead angles, preventing abrasive from accumulating in gaps or corners of the bottom plate and ensuring that all used abrasive can smoothly slide into the bottom opening. When processing large or extra-tall workpieces, the adjustable top plate can be raised to increase the interior space; when processing standard-sized workpieces, the adjustable top plate can be lowered to reduce the ventilation volume, thereby reducing the airflow requirements of the ventilation system, lowering fan energy consumption, and improving the flexibility of the sandblasting chamber.

[0007] Furthermore, in the aforementioned sandblasting chamber with sand return function, the spray gun is held by a sandblasting robot, and a spray gun base is located on the upper side of the continuously arranged sand return hoppers. The sandblasting robot is connected to the top surface of the spray gun base. The spray gun base is located on one side of the sandblasting chamber. The sandblasting robot performs multi-dimensional movements according to a preset program, covering all surfaces of the workpiece, improving the uniformity and efficiency of the sandblasting process, and performing automated sandblasting operations by holding the spray gun, thus achieving automated and intelligent sandblasting operations.

[0008] Furthermore, in the aforementioned sandblasting chamber with sand return function, the air inlet is located on the upper side of the spray gun base, and the exhaust outlet is located on the side away from the spray gun base. The air inlet and exhaust outlet form a top-to-bottom airflow path. Fresh air is horizontally delivered into the chamber from the air inlet located on the upper side of the spray gun base. Because the exhaust outlet is located at the bottom on the opposite side away from the spray gun base, and negative pressure is created by the dust removal system fan, the air entering the chamber will naturally form a directional airflow from top to bottom, from the air inlet side to the exhaust outlet side. This airflow can effectively "push" the dust generated by sandblasting towards the exhaust outlet, preventing the dust from rising and spreading.

[0009] Furthermore, in the aforementioned sandblasting chamber with sand return function, the liftable roof panel is suspended from the underside of the chamber's roof by multiple steel wires. These wires are wound around suspension rollers located on the roof of the liftable roof panel. The ends of the wires furthest from the liftable roof panel are connected to a winch located on the roof of the sandblasting chamber. The winch drives the liftable roof panel to move vertically up and down by winding and unwinding the steel wires. When the height inside the chamber needs to be adjusted, the winch is activated. The winch winds up or releases the steel wires, which change direction via the suspension rollers, thereby raising or lowering the liftable roof panel.

[0010] Furthermore, in the aforementioned sandblasting chamber with sand return function, the air inlet and exhaust outlet are both designed as parallel elongated strips. The openings of the air inlet and exhaust outlet are positioned opposite each other, with the side of the air inlet away from the exhaust outlet having an arc shape, and the side of the exhaust outlet away from the air inlet also having an arc shape. The parallel elongated shape and opposite openings of the air inlet and exhaust outlet, with the air inlet located on the upper side of the spray gun base and the exhaust outlet located on the side away from the spray gun base, form a top-to-bottom directional airflow path, ensuring that dust-laden air flows along a preset path and improving dust removal efficiency.

[0011] Furthermore, in the aforementioned sandblasting chamber with sand return function, the angle between the sand return hopper wall and the horizontal plane is greater than the angle of repose of the abrasive. The abrasive falling into the sand return hopper slides down the hopper wall under its own gravity. Because the angle between the hopper wall and the horizontal plane is designed to be greater than the angle of repose of the abrasive, the abrasive will not remain on the inclined surface but will continue to slide down to the bottom opening, preventing the abrasive from sticking and clogging on the hopper wall, thus ensuring the continuity of the sand return process.

[0012] Furthermore, in the aforementioned sandblasting chamber with sand return function, the sand return hopper is designed in a funnel shape. The funnel-shaped structure ensures that the abrasive can gather towards the center, facilitating its recovery through pipelines.

[0013] Furthermore, in the aforementioned sandblasting chamber with sand return function, the wall of the sand return hopper on the side away from the air inlet is set as a straight wall, while the remaining walls of the sand return hopper are set inclined towards the center of the sand return hopper. During sandblasting, there is a directional airflow from top to bottom, from the air inlet side to the air outlet side. If the wall of the hopper on the side away from the air inlet is set as an inclined surface, the inclined wall surface will guide the airflow upward and reflect it, generating unnecessary local vortices, causing the abrasive to be rolled up again, affecting abrasive collection and reducing dust removal efficiency.

[0014] As can be seen from the above technical solution, this utility model has the following beneficial effects: The sandblasting chamber with sand return function of this utility model, through the continuous arrangement of funnel-shaped sand return hoppers covering the bottom plate without dead angles, and with the hopper wall inclination angle set greater than the abrasive's angle of repose, avoids abrasive accumulation on the bottom plate or hopper wall, ensuring smooth abrasive sliding and recycling, thus improving sand return efficiency and continuity. The addition of a liftable top plate allows for flexible adjustment of the chamber height and ventilation volume according to the workpiece size, reducing ventilation energy consumption and operating costs. The reasonable placement of air inlets and outlets forms a top-to-bottom directional airflow path, which, combined with the negative pressure of the dust removal system, guides dust-laden air along a preset path, improving dust removal efficiency and the working environment. The side of the sand return hopper away from the air inlet is designed as a straight wall, avoiding the reflection of airflow from the inclined wall surface to generate vortices, preventing the abrasive from being rolled up again, further improving the abrasive collection and dust removal effect. Attached Figure Description

[0015] Figure 1 This is a front view of the sandblasting chamber with sand return function according to this utility model; Figure 2 This is a front view of the sandblasting system; Figure 3 This is a schematic diagram of the sand return hopper described in Example 2.

[0016] In the diagram: 1. Sandblasting chamber, 11. Sand return hopper, 2. Sand and dust sorting system, 12. Liftable top plate, 121. Air inlet, 122. Air outlet, 123. Steel wire, 13. Suspension roller, 14. Winch, 3. Sandblasting system, 4. Spray gun, 41. Sandblasting robot, 42. Spray gun base. Detailed Implementation

[0017] Example 1 like Figure 1-2 The sandblasting chamber shown includes a sandblasting chamber body 1. The bottom plate of the sandblasting chamber body 1 is composed of continuously arranged sand return hoppers 11. The bottom opening of the sand return hoppers 11 is connected to a sand and dust separation system 2 located outside the sandblasting chamber body 1 via a pipeline. A sandblasting system 3 is located outside the sandblasting chamber body 1. The sand and dust separation system 2 is connected to the sand storage tank of the sandblasting system 3 via a pipeline. The sandblasting system 3 receives the sand material processed and recovered by the sand and dust separation system 2. The sandblasting system 3 is connected to a spray gun 4 located inside the sandblasting chamber body 1 via a pipeline. The top of the sandblasting chamber body 1 is provided with a liftable top plate 12. The liftable top plate 12 is provided with an air inlet 121, which is connected to an external air source via a folded flexible hose. The bottom of the sandblasting chamber body 1 is provided with an exhaust port 122, which is connected to a dust removal system located outside the sandblasting chamber body 1 via a folded flexible hose. The dust removal system uses a bag filter with a filtration accuracy of less than 1μm. A pulse cleaning device is installed at the top to periodically clean the bags and maintain stable dust removal efficiency. The sand storage tank is equipped with an ultrasonic level sensor; when the abrasive level falls below a set value, an alarm is triggered to remind the operator to replenish the abrasive. A pressure-feed sandblasting pump with a working pressure of 0.7-0.9MPa is connected to the bottom of the sand storage tank, delivering the abrasive to the spray gun 4 via a high-pressure hose.

[0018] In this embodiment, the spray gun 4 is held by a sandblasting robot 41. A spray gun base 42 is provided on the upper side of the continuously arranged sand return hoppers 11, and the sandblasting robot 41 is connected to the top surface of the spray gun base 42. The spray gun base 42 is located on one side of the sandblasting chamber 1. The sandblasting robot 41 performs multi-dimensional movements according to a preset program, covering all surfaces of the workpiece, improving the uniformity and efficiency of the sandblasting process, and holding the spray gun 4 to perform automated sandblasting operations, thus realizing automated and intelligent sandblasting operations.

[0019] In this embodiment, the air inlet 121 is located on the upper side of the spray gun base 42, and the exhaust outlet 122 is located on the side away from the spray gun base 42. The air inlet 121 and the exhaust outlet 122 form a top-to-bottom airflow path. Fresh air is horizontally delivered into the chamber from the air inlet 121 located on the upper side of the spray gun base 42. Since the exhaust outlet 122 is located at the bottom of the other side away from the spray gun base 42, and a negative pressure is formed under the action of the dust removal system fan, the air entering the chamber will naturally form a directional airflow from top to bottom, from the air inlet side to the exhaust outlet side. This airflow can effectively "push" the dust generated by sandblasting towards the exhaust outlet, preventing the dust from rising and spreading.

[0020] In this embodiment, the liftable roof panel 12 is suspended from the lower side of the roof of the sandblasting chamber 1 by multiple steel wires 123. The steel wires 123 are respectively wound around suspension rollers 13 located on the roof of the liftable roof panel 12. The ends of the steel wires 123 away from the liftable roof panel 12 are connected to a winch 14 located on the roof of the sandblasting chamber 1. The winch 14 drives the liftable roof panel 12 to move vertically up and down by winding and unwinding the steel wires 123. Guide sliders are provided on both sides of the liftable roof panel 12, and vertical guide grooves are correspondingly provided on the inner wall of the sandblasting chamber 1. The guide sliders are slidably embedded in the guide grooves to limit the movement direction of the liftable roof panel 12. When it is necessary to adjust the height inside the chamber, the winch 14 is activated. The winch 14 winds up or releases the steel wires 123, and the steel wires 123 change direction via the suspension rollers 13, thereby raising or lowering the liftable roof panel 12.

[0021] In this embodiment, the air inlet 121 and the air outlet 122 are both elongated and parallel. The openings of the air inlet 121 and the air outlet 122 are opposite to each other. The side of the air inlet 121 away from the air outlet 122 has an arc shape, and the side of the air outlet 122 away from the air inlet 121 also has an arc shape. The elongated opening of the air inlet is equipped with a grille, which is tilted downwards to guide the airflow downwards, enhancing the dust pushing effect.

[0022] In this embodiment, the angle between the wall of the return sand hopper 11 and the horizontal plane is greater than the angle of repose of the abrasive. The abrasive falling into the return sand hopper 11 slides down the hopper wall under its own gravity. Because the angle between the hopper wall and the horizontal plane is designed to be greater than the angle of repose of the abrasive, the abrasive will not remain on the inclined surface and will continue to slide down to the bottom opening. The angle between the return sand hopper wall and the horizontal plane is designed according to the angle of repose of the abrasive; for example, the angle of repose of quartz sand is approximately 30-35 degrees, and the hopper wall inclination angle is set to 40 degrees or more.

[0023] In this embodiment, the sand return hopper 11 is designed as a funnel. The funnel-shaped structure ensures that the abrasive can gather towards the center, facilitating its recovery through the pipeline. A pneumatic gate valve is installed at the bottom opening of the sand return hopper, and its opening degree is linked to the feeding speed of the sand and dust separation system via a PLC control system to prevent pipeline blockage.

[0024] This utility model provides a sandblasting chamber with a sand return function. Its sand and dust separation system specifically includes a vibrating screen and a cyclone separator. The sand and dust mixture conveyed by the sand return hopper is first separated by the vibrating screen to remove impurities such as metal fragments larger than the abrasive particle size (e.g., using a double-layer screen, the upper screen with a 2mm aperture separates large particles, and the lower screen with a 0.1mm aperture separates broken abrasive particles). Then, it enters the cyclone separator, where centrifugal force separates the denser, reusable abrasive particles (such as quartz sand and corundum sand) from the dust. The dust is introduced into the dust removal system from the top of the cyclone separator, while the clean abrasive falls into the sand storage tank of the sandblasting system for recycling. A hopper is located on the upper side of the sand storage tank, and a pressure-feed sandblasting pump is connected to the bottom of the tank.

[0025] During operation, the height of the workpiece needs to be monitored. The winch 14 is activated to wind up or release the steel wire 123, which raises or lowers the adjustable top plate 12 to adjust the height inside the chamber. Then, the spray gun 4 is activated, spraying abrasive material onto the workpiece. Used abrasive and detached impurities fall into the chamber's bottom plate, which consists of continuously arranged return sand hoppers 11. The sand and dust mixture is transported through pipes to the sand and dust separation system 2 outside the chamber via openings at the bottom of the return sand hoppers 11. The sand and dust separation system 2 separates reusable whole abrasive from dust and broken abrasive. The recovered clean abrasive is piped into the sand storage tank of the sandblasting system 3, awaiting reuse. The sandblasting system 3 transports the abrasive through pipes to the spray gun 4, completing a closed abrasive cycle. Simultaneously, an external air source supplies fresh air into the chamber through a folded flexible hose and an air inlet 121 on the adjustable top plate 12. The dust-laden air inside the room is guided by the airflow organization to the exhaust port 122 at the bottom of the room, which is connected by a folded flexible hose, and is finally drawn into the external dust removal system for purification.

[0026] Other details in this embodiment are standard settings in the art and will not be repeated here.

[0027] Example 2 The difference between this embodiment and Embodiment 1 is that, as Figure 3 As shown, the wall of the sand return hopper 11 on the side away from the air inlet 121 is a straight wall, while the remaining walls of the sand return hopper 11 are inclined towards the center of the sand return hopper 11. During sandblasting, there is a directional airflow from top to bottom and from the air inlet side to the air outlet side. If the wall of the hopper on the side away from the air inlet 121 is made into an inclined surface, the inclined wall will guide the airflow upward and reflect it, generating unnecessary local vortices, causing the abrasive to be rolled up again, affecting abrasive collection and reducing dust removal efficiency.

[0028] The above embodiments are exemplary and are intended to illustrate the technical concept and features of this utility model, so that those skilled in the art can understand the content of this utility model and implement it accordingly. They should not be construed as limiting 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 sandblasting chamber with sand return function, characterized in that: The equipment includes a sandblasting chamber (1), the bottom plate of which is composed of continuously arranged sand return hoppers (11), the bottom opening of which is connected to a sand and dust separation system (2) located outside the sandblasting chamber (1) via a pipeline; a sandblasting system (3) is provided outside the sandblasting chamber (1), the sand and dust separation system (2) is connected to the sand storage tank of the sandblasting system (3) via a pipeline; the sandblasting system (3) is connected to a spray gun (4) located inside the sandblasting chamber (1) via a pipeline; a liftable top plate (12) is provided on the top of the sandblasting chamber (1), the liftable top plate (12) is provided with an air inlet (121), the air inlet (121) is connected to an external air source via a folded hose; an exhaust port (122) is provided at the bottom of the sandblasting chamber (1), the exhaust port (122) is connected to a dust removal system located outside the sandblasting chamber (1) via a folded hose.

2. The sandblasting chamber with sand return function according to claim 1, characterized in that: The spray gun (4) is held by the sandblasting robot (41), and the upper side of the continuously arranged sand return hopper (11) is provided with a spray gun base (42). The sandblasting robot (41) is connected to the top surface of the spray gun base (42). The spray gun base (42) is located on one side of the sandblasting chamber (1).

3. The sandblasting chamber with sand return function according to claim 2, characterized in that: The air inlet (121) is located on the upper side of the spray gun base (42), and the air outlet (122) is located on the side away from the spray gun base (42); the air inlet (121) and the air outlet (122) form a top-to-bottom air path.

4. The sandblasting chamber with sand return function according to claim 1, characterized in that: The liftable roof panel (12) is suspended from the roof of the sandblasting chamber (1) by multiple steel wires (123). The multiple steel wires (123) are respectively wound around the suspension rollers (13) provided on the roof of the liftable roof panel (12). The end of the steel wire (123) away from the liftable roof panel (12) is connected to the winch (14) provided on the roof of the sandblasting chamber (1). The winch (14) drives the liftable roof panel (12) to move up and down in the vertical direction by winding and unwinding the steel wires (123).

5. The sandblasting chamber with sand return function according to claim 1, characterized in that: The air inlet (121) and the air outlet (122) are respectively set as parallel elongated strips; the openings of the air inlet (121) and the air outlet (122) are set opposite to each other, the side of the air inlet (121) away from the air outlet (122) is set as arc-shaped, and the side of the air outlet (122) away from the air inlet (121) is set as arc-shaped.

6. The sandblasting chamber with sand return function according to claim 1, characterized in that: The angle between the wall of the return sand hopper (11) and the horizontal plane is greater than the angle of repose of the abrasive.

7. The sandblasting chamber with sand return function according to claim 6, characterized in that: The return sand hopper (11) is configured as a funnel.

8. The sandblasting chamber with sand return function according to claim 6, characterized in that: The wall of the sand return hopper (11) on the side away from the air inlet (121) is set as a straight wall, and the remaining walls of the sand return hopper (11) are set at an inclination towards the center of the sand return hopper (11).

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