A negative pressure recovery cabin structure for brake pad surface sand blasting cleaning

Abstract

The utility model provides a kind of brake pad surface sand blasting cleaning's negative pressure recovery cabin structure, belong to brake pad surface sand blasting cleaning technical field, this brake pad surface sand blasting cleaning's negative pressure recovery cabin structure includes recovery cabin body, sealing cover, air suction duct and filter screen frame, the recovery cabin body is cuboid box type structure, the top of the recovery cabin body is equipped with rectangular opening, the sealing cover is connected in the top opening of the recovery cabin body one side edge by hinge shaft, for supporting sealing cover rotates around hinge shaft and realizes opening and closure, the air suction duct is inserted into the side wall of the recovery cabin body, one end of the air suction duct is located in the internal space of the recovery cabin body;It can solve the problem that sand and dust produced by sand blasting easily spread and splash to the surrounding environment when brake pad surface is sand blasted and cleaned in prior art, cause that working site environment is seriously polluted, sand cannot be effectively recycled and utilized, leading to material waste.

Description

Technical Field

[0001] This utility model belongs to the field of brake pad surface sandblasting cleaning technology, specifically, it relates to a negative pressure recovery chamber structure for brake pad surface sandblasting cleaning. Background Technology

[0002] As a key component of the automotive braking system, brake pads' surface quality directly affects braking performance and safety. During brake pad manufacturing, their surface undergoes sandblasting. High-speed abrasive particles impact the brake pad surface, removing oxide layers, burrs, and other impurities, increasing surface roughness, and enhancing the bond strength with the friction pad. Traditional brake pad sandblasting operations are typically conducted in open or semi-open environments. This process generates large amounts of abrasive particles and dust, causing severe dust pollution, reduced visibility, and hindering operator work. Inhaled dust can lead to occupational diseases such as pneumoconiosis over time, seriously endangering health. Furthermore, the abrasive particles scattered on the ground and equipment cannot be effectively collected and recycled, resulting in significant abrasive waste and increased production costs. Some simple recycling devices exist in the existing technology, which use cloth bags or filters to collect sand. However, these devices have poor sealing performance and are prone to air leakage from the interface when suctioned under negative pressure, which reduces the recycling efficiency. The sand and dust are mixed together and difficult to separate, which affects the reuse of sand. The device structure is often relatively complex and inconvenient to clean and maintain, which limits its application and promotion in actual production. Utility Model Content

[0003] In view of this, the present invention provides a negative pressure recovery chamber structure for sandblasting cleaning of brake pad surfaces. This structure can solve the problems in the prior art where, during sandblasting cleaning of brake pad surfaces, the sand and dust generated by sandblasting easily spread and splash into the surrounding environment, causing serious environmental pollution at the work site. The sand cannot be effectively recycled, resulting in material waste, and the flying dust also endangers the health of operators. Existing simple recycling devices have poor sealing performance, low negative pressure recovery efficiency, and are difficult to separate after the sand and dust are mixed. Furthermore, they have complex structures and are inconvenient to maintain, failing to meet the actual needs of environmental protection and sand recycling in brake pad sandblasting cleaning operations.

[0004] This utility model is implemented as follows:

[0005] This utility model provides a negative pressure recovery chamber structure for sandblasting cleaning of brake pad surfaces, including a recovery chamber body, a sealing cover, an air intake duct, and a filter frame. The recovery chamber body has a rectangular box structure with a rectangular opening at the top. The sealing cover is connected to one edge of the top opening of the recovery chamber body via a hinge shaft, which supports the sealing cover to rotate around the hinge shaft to open and close. The air intake duct passes through the side wall of the recovery chamber body, with one end located in the internal space of the recovery chamber body and the other end extending to the outside of the recovery chamber body. The filter frame is fixedly installed at the bottom of the internal space of the recovery chamber body, and a storage cavity is formed between the upper surface of the filter frame and the bottom inner surface of the recovery chamber body.

[0006] The technical advantages of the negative pressure recovery chamber structure for sandblasting cleaning of brake pads provided by this utility model are as follows: By setting up a combination structure of recovery chamber, sealing cover, air intake duct and filter frame, a complete negative pressure recovery system is formed. The recovery chamber provides a closed recovery space, the sealing cover is connected by a hinge shaft to realize convenient opening and closing operation, the air intake duct realizes the introduction of negative pressure airflow, the filter frame forms a separation space between sand and dust inside the recovery chamber, and the storage chamber is used to collect settled sand. The overall structure is simple and compact, realizing the effective recovery of sand and dust during the sandblasting cleaning process of brake pads and avoiding leakage and pollution of sand and dust.

[0007] Based on the above technical solution, the negative pressure recovery chamber structure for sandblasting cleaning of brake pad surface of this utility model can be further improved as follows:

[0008] The thickness of the sidewalls of the recovery chamber increases downwards along the vertical direction, and the thickness of the bottom sidewall of the recovery chamber is greater than the thickness of the top sidewall of the recovery chamber.

[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the thickness of the side wall of the recovery chamber increases downward along the vertical direction, and the thickness of the bottom side wall is greater than that of the top side wall. This design makes the bottom of the recovery chamber have higher structural strength and can withstand the gravity load generated by the accumulation of sand. At the same time, the smaller thickness of the top side wall reduces the overall weight and lowers the material cost. The gradual distribution of the side wall thickness also improves the impact resistance of the recovery chamber and extends its service life.

[0010] Furthermore, a raised sealing strip is provided on the lower surface of the sealing cover along its periphery. The raised sealing strip is rectangular and ring-shaped. When the sealing cover is closed, the raised sealing strip is pressed into contact with the edge of the top opening of the recovery chamber.

[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: a raised sealing strip is set along the perimeter of the lower surface of the sealing cover. The raised sealing strip is in rectangular ring shape and presses tightly against the edge of the top opening of the recovery chamber. This structure forms an effective sealing connection, preventing external air from seeping in from the gap between the cover and the chamber during negative pressure operation, ensuring the airtightness of the negative pressure recovery system, improving the recovery efficiency of sand and dust, and the elastic deformation of the raised sealing strip can also compensate for the assembly gap between the cover and the chamber and adapt to wear and deformation after long-term use.

[0012] Furthermore, the angle between the axis of the air intake duct and the side wall of the recovery chamber is 30~45°, and the end of the air intake duct located inside the recovery chamber has a flared, funnel-shaped opening.

[0013] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the axis of the air intake duct is set at an angle of 30~45° with the side wall of the recovery chamber. This tilt angle causes the negative pressure airflow to form a downward flow direction after entering the recovery chamber, which is conducive to the rapid settling of sand and dust under the combined action of gravity and airflow. The air intake duct has a funnel-shaped opening at one end inside the recovery chamber, which expands the range of airflow, reduces the airflow speed, reduces the secondary stirring of the settled sand, and improves the separation efficiency and recovery quality of sand.

[0014] Furthermore, the filter frame has a grid-like structure and includes several parallel support bars that extend along the length of the recovery chamber.

[0015] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: The filter screen frame adopts a grid-like structure, which is composed of several parallel bearing bars extending along the length of the recovery chamber. This structure ensures that sand particles can pass through smoothly while providing sufficient bearing strength. The parallel arrangement of the bearing bars allows the sand to be evenly distributed in the storage chamber, avoiding local accumulation. The grid-like structure is also easy to clean and maintain, and can be easily removed for cleaning, thus extending the service life of the filter screen frame.

[0016] Furthermore, the spacing between two adjacent support strips is less than the width of the support strip, the cross-section of the support strip is trapezoidal, and the width of the upper surface of the support strip is greater than the width of the lower surface of the support strip.

[0017] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the spacing between two adjacent support strips is less than the width of the support strip. This design ensures that the filter frame has sufficient bearing area to prevent larger sand particles from impacting the bottom when they fall. The cross-section of the support strip is trapezoidal and the width of the upper surface is greater than the width of the lower surface. The trapezoidal structure enhances the bending stiffness of the support strip. The shape of being wider at the top and narrower at the bottom makes it easier for sand particles to slide from the gaps between the support strips into the storage chamber, reducing the accumulation of sand on the filter frame and improving the filtration and separation effect.

[0018] Furthermore, the inner wall surface of the recovery chamber is coated with an anti-corrosion coating, and the four inner corners of the recovery chamber are provided with arc transition surfaces.

[0019] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the anti-corrosion coating on the inner wall surface of the recovery chamber effectively prevents the corrosion of the recovery chamber by corrosive substances that may be contained in the sand and dust, thus extending the service life of the recovery chamber. The rounded transition surfaces at the four inner corners of the recovery chamber eliminate the dead corners for sand accumulation that are easily formed by right-angle structures, allowing the sand to slide smoothly to the bottom of the storage chamber. The rounded transition surfaces also reduce the vortex effect of airflow at the corners, improve the overall recovery efficiency, and facilitate cleaning and maintenance.

[0020] Furthermore, the sealing cover is made of steel plate, and the recovery chamber is made of stainless steel plate.

[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the sealing cover is made of steel plate material, which has good strength and toughness and can withstand the stress generated by frequent opening and closing operations. The recovery chamber is made of stainless steel plate material, which has excellent corrosion resistance and can resist the long-term wear and corrosion of sand and dust. Both materials are commonly used industrial materials, with mature processing technology and moderate cost. The rational selection of materials ensures the reliability and economy of the overall structure.

[0022] Furthermore, the air intake duct is a cylindrical tubular structure, and the air intake duct is fixedly connected to the side wall of the recovery chamber by welding.

[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the suction duct adopts a cylindrical tubular structure, and the circular cross-section has the minimum flow resistance, which can ensure the smooth delivery of negative pressure airflow and reduce energy loss. The suction duct is fixedly connected to the side wall of the recovery chamber by welding. The welded connection has high strength and good airtightness, and can withstand the suction force under negative pressure working conditions, preventing gas leakage at the connection point and ensuring the stable operation of the negative pressure recovery system.

[0024] Furthermore, the filter frame is fixedly installed on the inner bottom surface of the recycling chamber by bolt assembly, and a number of support feet are provided on the bottom outer surface of the recycling chamber, with the support feet distributed along the four corners of the bottom of the recycling chamber.

[0025] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the filter screen frame is fixedly installed on the bottom surface of the recycling chamber by bolt assembly. The bolt connection method facilitates disassembly and installation, and makes it convenient for cleaning, replacement and maintenance of the filter screen frame. Several support feet are set on the outer surface of the bottom of the recycling chamber and distributed along the four corners. The support feet lift the recycling chamber off the ground to form a stable support structure, which facilitates the cleaning operation of sand at the bottom of the storage chamber. The distribution of the support feet ensures that the recycling chamber is evenly stressed and improves the stability of the overall structure.

[0026] Compared with existing technologies, the beneficial effects of the negative pressure recovery chamber structure for brake pad surface sandblasting cleaning provided by this utility model are as follows: This utility model achieves efficient recovery of sand and dust during the brake pad sandblasting cleaning process by setting up a negative pressure recovery chamber structure composed of a recovery chamber body, a sealing cover, an air intake duct, and a filter screen. The recovery chamber body provides a closed recovery space, the sealing cover is connected by a hinge shaft for easy opening and closing, the raised sealing strip ensures good airtightness, the air intake duct is set at an inclined angle and forms a funnel-shaped flare inside, allowing the negative pressure airflow to guide the sand and dust to settle quickly, the grid-like structure of the filter screen achieves effective separation of sand and dust, and the storage chamber collects the settled sand for easy recycling. The overall structure contains only 4 main components, is simple and compact, and is easy to process and manufacture. The sealing cover and recovery chamber body are made of known materials such as steel plates and stainless steel plates, which are corrosion-resistant, wear-resistant, and have a long service life. Compared with existing technologies, this utility model has significant advantages such as good sealing performance, high recycling efficiency, thorough separation of sand and dust, and convenient maintenance and operation. It effectively solves the environmental pollution and sand waste problems in sandblasting operations, protects the health of operators, reduces production costs, and has good practical value and prospects for promotion and application. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A schematic diagram of a negative pressure recovery chamber structure for sandblasting cleaning of brake pad surfaces;

[0029] Figure 2This is a schematic diagram of the sealing cover plate.

[0030] Figure 3 This is a schematic diagram of the filter frame structure;

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 1. Recovery chamber; 2. Sealing cover; 3. Suction duct; 4. Filter frame. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0034] like Figure 1-3 The diagram shows a negative pressure recovery chamber structure for sandblasting cleaning of brake pad surfaces provided by this utility model. The structure includes a recovery chamber body 1, a sealing cover 2, an air intake duct 3, and a filter frame 4. The recovery chamber body has a rectangular box-like structure with a rectangular opening at the top. The sealing cover is connected to one edge of the top opening of the recovery chamber body via a hinge shaft, supporting the sealing cover to rotate around the hinge shaft to open and close. The air intake duct penetrates the side wall of the recovery chamber body, with one end located inside the chamber and the other end extending outside. The filter frame is fixedly installed at the bottom of the chamber's interior space, forming a storage cavity between the upper surface of the filter frame and the bottom inner surface of the recovery chamber body.

[0035] In the above technical solution, the thickness of the sidewall of the recovery chamber increases downward along the vertical direction, and the thickness of the bottom sidewall of the recovery chamber is greater than the thickness of the top sidewall of the recovery chamber.

[0036] Furthermore, in the above technical solution, a raised sealing strip is provided on the lower surface of the sealing cover along its periphery. The raised sealing strip is rectangular and ring-shaped. When the sealing cover is closed, the raised sealing strip is pressed into contact with the edge of the top opening of the recovery chamber.

[0037] Furthermore, in the above technical solution, the angle between the axis of the air intake duct and the side wall of the recovery chamber is 30~45°, and the end of the air intake duct located inside the recovery chamber has a flared, trumpet-shaped opening.

[0038] Furthermore, in the above technical solution, the filter frame has a grid-like structure, and the filter frame includes several parallel support bars that extend along the length of the recovery chamber.

[0039] Furthermore, in the above technical solution, the spacing between two adjacent support strips is less than the width of the support strip, the cross-section of the support strip is trapezoidal, and the width of the upper surface of the support strip is greater than the width of the lower surface of the support strip.

[0040] Furthermore, in the above technical solution, the inner wall surface of the recovery chamber is coated with an anti-corrosion coating, and the four inner corners of the recovery chamber are provided with arc transition surfaces.

[0041] Furthermore, in the above technical solution, the sealing cover is made of steel plate material, and the recovery chamber is made of stainless steel plate material.

[0042] Furthermore, in the above technical solution, the air intake duct is a cylindrical tubular structure, and the air intake duct is fixedly connected to the side wall of the recovery chamber by welding.

[0043] Furthermore, in the above technical solution, the filter frame is fixedly installed on the inner bottom surface of the recovery chamber by bolt assembly, and several support feet are provided on the bottom outer surface of the recovery chamber, with the support feet distributed along the four corners of the bottom of the recovery chamber.

[0044] The following is a specific embodiment 1 of this utility model: In this embodiment, the recovery chamber is made of 304 stainless steel plate with a thickness of 3mm, which is processed by bending and welding. The overall shape is a rectangular box structure with external dimensions of 800mm in length, 600mm in width, and 500mm in height. The thickness of the side walls of the recovery chamber increases downward along the vertical direction, with the top side wall thickness being 3mm and the bottom side wall thickness being 5mm. The increase in side wall thickness is achieved by welding reinforcing plates on the inner side. The top of the recovery chamber has a rectangular opening with a size of 750mm*550mm, and each of the four inner corners is provided with an arc transition surface with a radius of curvature of 20mm. The inner wall surface is coated with an epoxy resin anti-corrosion coating with a thickness of 0.2mm. The sealing cover is made of 4mm thick Q235 steel plate, with a planar dimension of 760mm*560mm. The sealing cover is connected to one edge of the top opening of the recovery chamber via two 8mm diameter stainless steel hinge shafts. The hinge shafts pass through hinge seats welded to the edge of the chamber and hinge ears on the edge of the sealing cover to achieve a rotatable connection. A rectangular rubber raised sealing strip with a cross-section of 10mm*8mm is provided along the perimeter of the lower surface of the sealing cover. The raised sealing strip is fixed to the lower surface of the sealing cover by adhesive. When the sealing cover is closed, the raised sealing strip undergoes a 3-5mm compression deformation with the edge of the top opening of the recovery chamber to form a seal. The intake duct is made of seamless steel pipe with an outer diameter of 89mm and a wall thickness of 4mm. The intake duct enters the side wall of the recovery chamber 100mm from the top opening of the chamber. The angle between the axis of the intake duct and the side wall of the recovery chamber is 38°. The end of the intake duct inside the recovery chamber is flared into a trumpet shape by a tapered flare, with a diameter of 120mm. The intake duct is fixedly connected to the side wall of the recovery chamber by argon arc welding. The filter frame has a grid-like structure, consisting of 9 parallel support bars. The support bars are made of 3mm thick stainless steel sheet, stamped and formed. Each support bar is 780mm long and 25mm wide, with a trapezoidal cross-section. The upper surface is 25mm wide, the lower surface is 15mm wide, and the trapezoidal height is 30mm. The spacing between adjacent support bars is 20mm. The filter frame is fixedly installed on the bottom surface of the recycling chamber using eight M10 stainless steel bolts. A storage cavity with a height of 150mm is formed between the upper surface of the filter frame and the inner bottom surface of the recycling chamber. Four support feet are located at the four corners of the bottom outer surface of the recycling chamber. These support feet are made of welded angle steel, are 80mm high, and have rubber pads at their bottoms to increase friction.

[0045] The following is another specific embodiment 2 of this utility model: Embodiment 2 is based on Embodiment 1, with a transparent observation window added to the center of the upper surface of the sealing cover. The observation window is made of 8mm thick tempered glass and measures 200mm*150mm. It is fixed to a pre-drilled rectangular hole in the sealing cover by a rubber sealing ring and a pressure strip. Operators can observe the sandblasting cleaning status of the brake pads and the settling of sand inside the recovery chamber through the observation window, eliminating the need to frequently open the sealing cover and maintaining the stability of the negative pressure environment inside the recovery chamber. Simultaneously, a discharge port is added to the lower part of the other side wall of the recovery chamber. The discharge port measures 100mm*80mm and is sealed by a sliding plate. The sliding plate slides up and down along a guide groove on the outer wall of the recovery chamber to open and close. A rubber sealing strip is installed between the sliding plate and the discharge port to ensure airtightness. When a large amount of sand accumulates in the storage chamber, the discharge port can be opened to directly discharge the sand for recovery without disassembling the filter frame, improving the convenience and efficiency of sand cleaning.

[0046] The following is another specific embodiment 3 of this utility model: Embodiment 3 improves upon Embodiment 1 by modifying the structure of the filter frame. A fine filter screen woven from stainless steel wire is added below the support bars of the grid-like structure. The mesh size of the fine filter screen is 2mm*2mm. The fine filter screen is fixed to the lower surface of the support bars with bolts, forming a two-stage filtration structure. Larger sand particles pass directly through the gaps between the support bars and settle to the bottom of the storage chamber. Medium-sized sand particles are intercepted by the fine filter screen and deposited on its surface. Only very fine dust particles can pass through the fine filter screen with the airflow and enter the suction duct for discharge. This two-stage filtration structure significantly improves the sand recovery rate, reduces the amount of reusable sand lost with the airflow, and lowers production costs. Simultaneously, a cyclone separator is added at one end of the suction duct. The cyclone separator adopts a conical structure and uses the centrifugal force generated by the airflow rotation to separate and collect the fine dust particles discharged with the airflow, further improving the overall recovery efficiency and environmental protection effect.

[0047] Specifically, the principle of this invention is as follows: This invention adopts the working principle of negative pressure recovery. A negative pressure source is connected to an external air intake duct, creating a negative pressure environment inside the recovery chamber. The pressure difference between the inside and outside draws the sand and dust generated during sandblasting into the recovery chamber. A reliable seal is formed between the sealing cover and the recovery chamber via a raised sealing strip, ensuring that the negative pressure inside the recovery chamber is not affected by external air infiltration and maintaining a stable airflow. The air intake duct is set at an angle of 30 to 45 degrees, causing the intake airflow to flow downwards inside the recovery chamber. Combined with gravity, this promotes rapid settling of sand particles. The flared opening reduces the airflow velocity, minimizing secondary stirring of the settled sand. A filter frame is located at the bottom of the recovery chamber. Larger sand particles, under the influence of gravity and airflow, pass through the gaps in the filter frame and settle to the bottom of the storage chamber, while smaller dust particles are discharged through the air intake duct with the airflow, achieving separation of sand and dust. The design of the recovery hull with its sidewalls increasing in thickness downwards enhances the structural strength of the bottom, enabling it to withstand the gravitational load of accumulated sand. The anti-corrosion coating on the inner wall and the rounded transition surfaces reduce sand accumulation and corrosion, extending its service life. The overall structure, through a rational design of component shapes and the configuration of connections, simplifies the structure while ensuring recovery efficiency, facilitating manufacturing and maintenance.

[0048] First, place the recovery chamber in a suitable location within the brake pad sandblasting cleaning area. Secure the chamber to the ground using support feet. Connect one end of the suction duct to the negative pressure source device. Open the sealing cover and place the brake pads to be sandblasted inside the recovery chamber, with the surface to be cleaned facing upwards. Then close the sealing cover, ensuring the raised sealing strip presses firmly against the edge of the opening at the top of the recovery chamber to form a seal. Activate the negative pressure source device to create a negative pressure environment inside the recovery chamber through the suction duct. Maintain the negative pressure value within an appropriate range to ensure effective recovery. Operate the sandblasting equipment to clean the brake pad surface. After the abrasive particles impact the brake pad surface and complete the cleaning task, the abrasive particles and generated dust are sucked into the recovery chamber under negative pressure. The abrasive particles, under the combined action of gravity and the inclined airflow, pass through the filter frame and settle to the bottom of the storage chamber, while the dust is discharged through the suction duct with the airflow. After completing the sandblasting cleaning, turn off the negative pressure source device, open the sealing cover, and remove the cleaned brake pads. When the sand in the storage chamber accumulates to a certain amount, the filter screen frame is disassembled using bolt assembly, the sand at the bottom of the storage chamber is cleaned and recycled, and the filter screen frame is reinstalled after cleaning for continued use.

Claims

1. A negative pressure recovery chamber structure for sandblasting cleaning of brake pad surfaces, comprising a recovery chamber body, a sealing cover, an air intake duct, and a filter frame, wherein the recovery chamber body is a rectangular box structure, and a rectangular opening is provided at the top of the recovery chamber body, characterized in that, The sealing cover is connected to one side edge of the top opening of the recycling chamber via a hinge shaft, which supports the sealing cover to rotate around the hinge shaft to open and close. The air intake duct passes through the side wall of the recycling chamber, with one end of the air intake duct located in the internal space of the recycling chamber and the other end of the air intake duct extending to the outside of the recycling chamber. The filter frame is fixedly installed at the bottom of the internal space of the recycling chamber, and a storage cavity is formed between the upper surface of the filter frame and the bottom inner surface of the recycling chamber.

2. The negative pressure recovery chamber structure for sandblasting cleaning of brake pad surface according to claim 1, characterized in that, The thickness of the sidewalls of the recovery chamber increases downwards along the vertical direction, and the thickness of the bottom sidewall of the recovery chamber is greater than the thickness of the top sidewall of the recovery chamber.

3. The negative pressure recovery chamber structure for sandblasting cleaning of brake pad surface according to claim 2, characterized in that, The lower surface of the sealing cover is provided with a raised sealing strip along its periphery. The raised sealing strip is rectangular and ring-shaped. When the sealing cover is closed, the raised sealing strip is pressed into contact with the edge of the top opening of the recovery chamber.

4. The negative pressure recovery chamber structure for sandblasting cleaning of brake pad surface according to claim 3, characterized in that, The angle between the axis of the air intake duct and the side wall of the recovery chamber is 30-45°, and the end of the air intake duct located inside the recovery chamber has a flared, funnel-shaped opening.

5. The negative pressure recovery chamber structure for sandblasting cleaning of brake pad surface according to claim 4, characterized in that, The filter frame has a grid-like structure and includes several parallel support bars that extend along the length of the recovery chamber.

6. The negative pressure recovery chamber structure for sandblasting cleaning of brake pad surface according to claim 5, characterized in that, The spacing between two adjacent support bars is less than the width of the support bar, the cross-section of the support bar is trapezoidal, and the width of the upper surface of the support bar is greater than the width of the lower surface of the support bar.

7. The negative pressure recovery chamber structure for sandblasting cleaning of brake pad surface according to claim 6, characterized in that, The inner wall surface of the recovery chamber is coated with an anti-corrosion coating, and the four inner corners of the recovery chamber are provided with arc transition surfaces.

8. The negative pressure recovery chamber structure for sandblasting cleaning of brake pad surface according to claim 7, characterized in that, The sealing cover is made of steel plate, and the recovery chamber is made of stainless steel plate.

9. The negative pressure recovery chamber structure for sandblasting cleaning of brake pad surface according to claim 8, characterized in that, The air intake duct is a cylindrical tubular structure, and the air intake duct is fixedly connected to the side wall of the recovery chamber by welding.

10. The negative pressure recovery chamber structure for sandblasting cleaning of brake pad surface according to claim 9, characterized in that, The filter frame is fixedly installed on the inner bottom surface of the recycling chamber by bolt assembly. Several support feet are provided on the bottom outer surface of the recycling chamber, and the support feet are distributed along the four corners of the bottom of the recycling chamber.

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