Construction baghouse dust collection equipment

Abstract

The utility model relates to the field of building construction technology, specifically disclose a kind of construction bag type dust collecting equipment, comprising: bag type dust collector;Further comprising: laser scattering type sensor, laser scattering type sensor is arranged in the inside of bag type dust collector entrance, laser scattering type sensor utilizes light scattering to detect the dust concentration entering bag type dust collector;The utility model is matched by the synergic design of laser scattering type sensor+hydraulic drive power regulation, realizes the dynamic accurate matching of dust concentration and dust collecting power, laser scattering type sensor is installed in the core position of dust collector entrance, real-time capture dust concentration change, provides accurate data support for power regulation, is linked by electric push rod, hydraulic transmission and sliding rheostat, can linearly regulate power according to concentration data, compared with existing fixed power equipment, reduce 30%-50% energy consumption waste, significantly reduce the energy cost of civil engineering construction, meet the stringent requirements of environmental protection department to dust emission simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, specifically to a construction bag dust collection device. Background Technology

[0002] In the field of civil engineering, a large amount of dust is generated during construction, such as earthwork excavation, concrete mixing, sand and gravel crushing, and tunnel excavation. If this dust is discharged directly without effective treatment, it will not only cause the air quality at the construction site to deteriorate and endanger the health of construction workers (long-term inhalation can cause occupational diseases such as pneumoconiosis), but also have an adverse impact on the surrounding ecological environment. At the same time, high concentrations of dust adhering to the surface of equipment will also accelerate the aging of equipment and increase operation and maintenance costs.

[0003] In civil engineering construction, the amount of dust generated varies significantly between different processes (such as the foundation excavation stage and the main structure construction stage) and different work areas (such as open sites and closed tunnels). Existing baghouse dust collection equipment mostly adopts a fixed power or simple step-by-step adjustment mode, which is inconvenient to dynamically and accurately adjust the power according to the real-time dust concentration. When the dust concentration is low, the equipment operates at high power, resulting in energy waste; when the dust concentration rises sharply, the manual adjustment is delayed, resulting in a period of dust escape. It cannot effectively meet the stringent requirements of environmental protection and energy efficiency in civil engineering construction. Therefore, we propose a construction baghouse dust collection equipment. Utility Model Content

[0004] The purpose of this invention is to provide a construction bag dust collection device to solve the problem mentioned in the background art of inconvenience in dynamically and accurately adjusting the power according to the real-time dust concentration.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a construction bag dust collection device, comprising: a bag dust collector;

[0006] It also includes: a laser scattering sensor, which is installed inside the inlet of the bag filter and uses light scattering to detect the dust concentration entering the bag filter;

[0007] A fixed motor is provided with a fixed lead screw at its output end. A slider is slidably connected to the surface of the fixed lead screw. A connecting rod is provided inside the slider. A blow port is provided at one end of the connecting rod. The fixed motor drives the blow port to move on the surface of the fixed lead screw through the slider. The blow port cleans the surface of the laser scattering sensor.

[0008] An electric actuator is installed on one side of the baghouse dust collector. One end of the electric actuator is equipped with an oil tank, and a fixed pipe is installed on one side of the oil tank. A piston rod is slidably connected inside the fixed pipe, and a sliding rheostat is fixedly connected to one end of the piston rod. The electric actuator pushes the piston rod to move inside the fixed pipe through the hydraulic oil inside the oil tank. The piston rod drives the slider of the sliding rheostat to move, thereby indirectly adjusting the power of the baghouse dust collector.

[0009] The output end of the fixed motor is fixedly connected to a coupling, which is fixedly connected to one end of the fixed lead screw. One end of the fixed lead screw is rotatably connected to a fixed box, and the fixed motor is fixedly connected inside the fixed box.

[0010] The bottom of the slider is slidably connected to a guide rail, which is fixedly connected inside the fixed box. The bottom of the slider has a first groove that matches the guide rail.

[0011] The slider has a rotating groove in the middle that matches the connecting rod. A torsion spring is fixedly connected inside the rotating groove and is fixedly connected to one side of the connecting rod.

[0012] One end of the electric push rod is fixedly connected to a piston plate, which is slidably connected inside the oil tank. One end of the oil tank is fixedly connected to a connecting pipe, which is fixedly connected to one end of the fixed pipe.

[0013] The fixed tube is internally fixedly connected to a fixed spring, which is fixedly connected to one end of the piston rod.

[0014] The bottom of the sliding rheostat is fixedly connected to a protective box. A ventilation slot is provided on the side of the protective box near the sliding rheostat, and the electric push rod is fixedly connected inside the protective box.

[0015] This utility model has at least the following beneficial effects:

[0016] This invention achieves dynamic and precise matching between dust concentration and dust collection power through a collaborative design of a laser scattering sensor and hydraulic power adjustment. The laser scattering sensor is installed at the core position of the dust collector inlet to capture changes in dust concentration in real time, providing accurate data support for power adjustment. Through the linkage of electric push rod, hydraulic transmission and sliding rheostat, the power can be linearly adjusted according to the concentration data. Compared with existing fixed power equipment, it reduces energy waste by 30%-50%, significantly reduces the energy cost of civil engineering construction, and meets the stringent requirements of environmental protection departments for dust emissions.

[0017] This invention utilizes a blow-through port, where a fixed motor drives a high-precision ball screw to move a slider. Combined with guide rail constraints, this ensures the blow-through port moves smoothly along the sensor's detection window without jamming or collision. The annular jet structure of the blow-through port, combined with compressed air, achieves a cleaning efficiency of over 95%, thoroughly removing dust from the sensor surface. Simultaneously, the sensor surface is coated with a polytetrafluoroethylene (PTFE) anti-stick coating, reducing dust adsorption frequency. Coupled with a linkage logic that automatically initiates cleaning when the detection value deviation exceeds 10%, the invention ensures long-term stable sensor operation without manual intervention. Compared to manual cleaning, this reduces maintenance workload by over 80% and lowers the risk of sensor damage due to accidental human contact. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a three-dimensional structural diagram of the fixing box of this utility model;

[0020] Figure 3 This is a schematic diagram of the main cross-sectional structure of the fixing box of this utility model;

[0021] Figure 4 This is a schematic diagram of the main cross-sectional structure of the protective box of this utility model;

[0022] Figure 5 This is a schematic diagram of the structure at point A of this utility model.

[0023] In the diagram: 1. Baghouse dust collector; 2. Laser scattering sensor; 3. Fixed motor; 4. Fixed lead screw; 5. Slider; 6. Connecting rod; 7. Blowout port; 8. Electric push rod; 9. Oil tank; 10. Fixed pipe; 11. Piston rod; 12. Sliding rheostat; 13. Coupling; 14. Fixed box; 15. Guide rail; 16. Torsion spring; 18. Connecting pipe; 19. Fixed spring; 20. Protective box. Detailed Implementation

[0024] 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.

[0025] Example 1

[0026] Please see Figures 1 to 5 This utility model provides a technical solution: a construction bag dust collection device, comprising: a bag dust collector 1;

[0027] It also includes: a laser scattering sensor 2, which is installed inside the inlet of the bag filter 1. The laser scattering sensor 2 uses light scattering to detect the dust concentration entering the bag filter 1.

[0028] A fixed motor 3 is provided with a fixed lead screw 4 at its output end. A slider 5 is slidably connected to the surface of the fixed lead screw 4. A connecting rod 6 is provided inside the slider 5. A blow-out port 7 is provided at one end of the connecting rod 6. The fixed motor 3 drives the blow-out port 7 to move on the surface of the fixed lead screw 4 through the slider 5. The blow-out port 7 cleans the surface of the laser scattering sensor 2.

[0029] An electric push rod 8 is installed on one side of the baghouse dust collector 1. One end of the electric push rod 8 is equipped with an oil tank 9, and a fixed pipe 10 is installed on one side of the oil tank 9. A piston rod 11 is slidably connected inside the fixed pipe 10, and a sliding rheostat 12 is fixedly connected to one end of the piston rod 11. The electric push rod 8 pushes the piston rod 11 to move inside the fixed pipe 10 through the hydraulic oil inside the oil tank 9. The piston rod 11 drives the slider of the sliding rheostat 12 to move, thereby indirectly adjusting the power of the baghouse dust collector 1.

[0030] The equipment uses a baghouse dust collector 1 as the core for dust collection and integrates three major functional modules:

[0031] Real-time dust concentration detection module: Composed of laser scattering sensor 2, it is responsible for monitoring the dust concentration entering the dust collector in real time, providing data for power adjustment;

[0032] Automatic sensor cleaning module: Composed of fixed motor 3, fixed lead screw 4, slider 5, connecting rod 6, and blowing port 7, etc., it solves the problem of detection distortion caused by dust covering the laser sensor;

[0033] The intelligent dust collection power adjustment module consists of an electric push rod 8, an oil tank 9, a fixed pipe 10, a piston rod 11, a sliding rheostat 12, etc. It dynamically adjusts the power of the bag dust collector 1 according to the dust concentration to achieve "energy consumption on demand".

[0034] The laser scattering sensor 2 is installed inside the inlet of the bag filter 1 (near the center of the air inlet duct). It uses the "light scattering principle" to detect the dust concentration in the airflow in real time. The laser beam emitted by the sensor collides with the dust particles and is scattered. The intensity of the scattered light is positively correlated with the dust concentration. The sensor converts the light signal into an electrical signal (such as a 0-5V analog signal) and transmits it to the control center to provide accurate data for subsequent power adjustment (detection accuracy can reach ±5mg / m³, response time ≤20ms). This avoids the problems of "blindly operating at high power" or "incomplete collection at low power" of traditional equipment. The laser scattering sensor 2 is sealed to the inner wall of the air inlet duct (with a silicone sealing ring) to prevent dust from seeping into the equipment from the installation gap and affecting the operation of the sensor circuit.

[0035] The fixed motor 3 is a servo motor, fixedly installed inside the fixed box 14, and serves as the power source for the cleaning module. It drives the fixed lead screw 4 to rotate via forward and reverse rotation, thereby moving the slider 5. Its rotational speed can be precisely controlled (50-100 r / min) to ensure smooth movement of the slider 5 (0.5-1 cm / s), preventing collisions between the blow port 7 and the sensor due to excessive speed. The fixed lead screw 4 is a high-precision ball screw, with one end connected to the fixed motor 3 via a coupling 13, and the other end rotatably connected to the inner wall of the fixed box 14 (via a shaft). The connecting rod 6 (fixed) has threads on its surface that match the threaded holes inside the slider 5, converting the rotational motion of the motor into the linear motion of the slider 5, providing a movement trajectory for the blow-out port 7. The low friction characteristics of the ball screw (friction coefficient ≤0.001) ensure smooth movement of the slider 5, reducing jamming during the cleaning process. One end of the connecting rod 6 is embedded in the rotation groove of the slider 5 and elastically connected to the slider 5 via a torsion spring 16. The other end is fixedly connected to the blow-out port 7, serving to connect the slider 5 and the blow-out port 7. Simultaneously, the elastic deformation of the torsion spring 16 adapts to the laser scattering transmission... Different installation angles of sensor 2 ensure that the air outlet of the blow-out port 7 is always parallel to the sensor detection window (3-5mm spacing), avoiding airflow deviation that could lead to incomplete cleaning. The slider 5 has a cuboid structure with a threaded hole inside that matches the fixing screw 4. The bottom has a first sliding groove that matches the guide rail 15, and a rotating groove on one side. Its core function is to receive the power of the fixing screw 4, driving the connecting rod 6 and the blow-out port 7 to move linearly along the guide rail 15, thus achieving comprehensive blowing of the sensor detection window. The blow-out port 7 uses a ring-shaped jet structure made of plastic to ensure that compressed air covers the entire surface of the sensor. At the same time, a superhydrophobic and non-stick coating (such as polytetrafluoroethylene) is applied to the sensor surface to reduce dust adsorption. It is internally connected to a compressed air pipeline (compressed air pressure 0.3-0.5MPa). Its core function is to spray high-pressure airflow into the sensor detection window to blow away the covered dust. The cleaning frequency can be automatically controlled according to the sensor detection data (cleaning is started when the deviation between the detected value and the actual value exceeds 10%), with a cleaning efficiency of over 95%, ensuring long-term stable operation of the sensor.

[0036] The electric actuator 8 is a DC electric actuator (thrust 500-1000N, stroke 50-100mm), fixedly installed inside the protective box 20. It is the power source for the adjustment module, and performs telescopic movements according to the instructions of the control center, pushing the piston plate inside the oil tank 9 to move, converting electrical energy into hydraulic energy. Its telescopic speed can be precisely controlled (5-10mm / s) to ensure smooth changes in hydraulic pressure and avoid sudden changes in power adjustment. The oil tank 9 is a cylindrical container made of seamless steel pipe (volume 500-1000mL), filled with anti-wear hydraulic oil (such as L-HM46). One end is engaged with the piston plate of the electric actuator 8, and the other end is connected to the fixed... Pipe 10 is used to store hydraulic oil and transmit pressure. Its inner wall is precision polished (roughness Ra ≤ 0.8μm) to reduce frictional resistance during piston plate sliding and prevent hydraulic oil contamination (the top of the oil tank 9 is equipped with a sealing cap for periodic hydraulic oil replacement). The fixed pipe 10 is a cylindrical stainless steel pipe fixedly connected inside the protective box 20. A fixing spring 19 is fixedly connected inside, and the piston rod 11 is slidably connected. Its function is to provide sliding guidance for the piston rod 11 (limiting the piston rod 11 to move only axially), and to prevent hydraulic oil leakage through a sealing fit between the inner wall of the pipe and the piston rod 11 (an O-ring is installed on the surface of the piston rod 11), ensuring pressure control. To improve force transmission efficiency, the piston rod 11 is a cylindrical rod made of stainless steel. One end is slidably connected inside the fixed tube 10, and the other end extends to the outside of the fixed tube 10 and is fixedly connected to the slider of the sliding rheostat 12. Its core function is to convert the hydraulic oil pressure inside the fixed tube 10 into the mechanical displacement of the slider. When the hydraulic oil pressure increases, the piston rod 11 moves towards the sliding rheostat 12 against the elastic force of the fixed spring 19. When the pressure decreases, the fixed spring 19 pushes the piston rod 11 back to its original position, realizing the bidirectional movement of the slider. The sliding rheostat 12 is a wire-wound sliding rheostat 12, fixedly connected inside the protective box 20. The slider is fixedly connected to one end of the piston rod 11 and to... The electrical control system of the baghouse dust collector 1 is connected in series. Its core function is to change the resistance value of the circuit by moving the sliding plate, thereby adjusting the input current and power of the dust collector. When the dust concentration is high (sensor detection value > 1000mg / m³), the electric push rod 8 pushes the piston plate to increase the hydraulic pressure. The piston rod 11 drives the sliding plate to move, thereby reducing the resistance value, increasing the current, and increasing the power of the dust collector (e.g., from 50% of the rated power to 100%), enhancing the suction and filtration capabilities. When the dust concentration is low (detection value < 300mg / m³), the fixed spring 19 pushes the piston rod 11 to increase the resistance value, decrease the current, and reduce the power (e.g., to 30% of the rated power), reducing energy waste.

[0037] The output end of the fixed motor 3 is fixedly connected to a coupling 13, which is fixedly connected to one end of the fixed lead screw 4. One end of the fixed lead screw 4 is rotatably connected to a fixed box 14, and the fixed motor 3 is fixedly connected inside the fixed box 14.

[0038] Coupling 13 is fixedly connected between the output end of the fixed motor 3 and one end of the fixed lead screw 4. Its function is to compensate for the coaxiality error between the output shaft of the fixed motor 3 and the fixed lead screw 4 (allowable deviation of ±0.1mm), to prevent the lead screw from jamming due to shaft misalignment, and at the same time to transmit the torque of the motor and ensure the stable rotation of the lead screw. The fixed box 14 is a closed box made of sheet metal and is fixed to the outer wall of the inlet of the bag dust collector 1. Its function is to provide installation and protection space for the fixed motor 3, the fixed lead screw 4, and the slider 5. Dustproof cotton can be added inside (attached to the box wall) to prevent external dust from entering the module and affecting the operation of the transmission components. At the same time, the closed structure of the fixed box 14 can reduce the impact of construction vibration on the cleaning module and ensure the matching accuracy of the lead screw and the slider 5.

[0039] The bottom of the slider 5 is slidably connected to the guide rail 15, which is fixedly connected inside the fixed box 14. The bottom of the slider 5 is provided with a first groove that matches the guide rail 15.

[0040] The guide rail 15 is a linear guide rail 15, which is fixedly connected to the bottom surface inside the fixed box 14 and is adapted to the first slide groove of the slider 5. Its function is to limit the movement direction of the slider 5 (only move along the axial direction of the guide rail 15), prevent the slider 5 from rotating with the lead screw, and ensure that the blowing port 7 is always aligned with the sensor detection window (offset ≤ 0.5mm), thereby improving the cleaning accuracy.

[0041] The middle part of the slider 5 has a rotating groove that matches the connecting rod 6. A torsion spring 16 is fixedly connected inside the rotating groove and is fixedly connected to one side of the connecting rod 6.

[0042] The torsion spring 16 is fixedly connected between the inner wall of the rotating groove of the slider 5 and one side of the connecting rod 6. It has an elastic reset function. In its natural state, the torsion spring 16 is in contact with the surface of the bag filter under force. When the blowing port 7 enters the inlet of the bag filter, the torsion spring 16 resets and pushes the blowing port 7 to move closer to the sensor, avoiding rigid collision damage to the sensor, while ensuring that the blowing airflow covers the entire detection window.

[0043] One end of the electric push rod 8 is fixedly connected to a piston plate, which is slidably connected inside the oil tank 9. One end of the oil tank 9 is fixedly connected to a connecting pipe 18, which is fixedly connected to one end of the fixed pipe 10.

[0044] The piston plate is a circular thin sheet made of oil-resistant rubber material (such as nitrile rubber), which is fixedly connected to the telescopic end of the electric push rod 8 and slidably connected inside the oil tank 9. Its function is to transmit the thrust of the electric push rod 8 to the hydraulic oil in the oil tank 9. By sliding the piston plate, the internal volume of the oil tank 9 is changed, thereby adjusting the hydraulic oil pressure (pressure range 0.5-2MPa) to achieve "linear pressure regulation" and provide stable power for the movement of the piston rod 11. The connecting pipe 18 is a high-pressure rubber tube (pressure resistant 3MPa, oil-resistant, and aging-resistant), with both ends fixedly connected to the oil tank 9 and the fixed pipe 10, respectively. Its function is to transmit the hydraulic oil pressure in the oil tank 9 to the fixed pipe 10. Its flexible material can avoid pipe breakage caused by rigid connection, while ensuring that the pressure transmission is not delayed (hydraulic oil flow rate ≥10mL / s).

[0045] A fixing spring 19 is fixedly connected inside the fixing tube 10, and the fixing spring 19 is fixedly connected to one end of the piston rod 11.

[0046] The fixed spring 19 is a compression spring (elastic coefficient 5-10N / mm), which is fixedly connected between the bottom surface of the fixed tube 10 and one end of the piston rod 11. Its function is to provide a restoring force for the piston rod 11, ensuring that the piston rod 11 can quickly return to the initial position when the hydraulic oil pressure decreases. At the same time, the spring force balances the hydraulic pressure, preventing the piston rod 11 from moving violently due to sudden pressure changes, and ensuring that the resistance of the sliding rheostat 12 changes smoothly.

[0047] A protective box 20 is fixedly connected to the bottom of the sliding rheostat 12. A ventilation slot is provided on the side of the protective box 20 near the sliding rheostat 12. The electric push rod 8 is fixedly connected inside the protective box 20.

[0048] The protective box 20 is a closed box made of stainless steel and is fixed to the side of the bag dust collector 1. Its function is to provide protection for components such as the electric push rod 8, oil tank 9, and sliding rheostat 12. The internal ventilation slot (located on the side of the sliding rheostat 12) can dissipate heat in time (to prevent the sliding rheostat 12 from overheating and affecting the resistance stability). At the same time, the protective box 20 is waterproof and dustproof (a sealing ring is installed at the joint of the box), and can adapt to the harsh environment in the construction scene (such as rain and dust).

[0049] Example 2

[0050] In this second embodiment, the other structures remain unchanged. The difference from the first embodiment is that a control center is provided inside the protective box 20 on the side near the sliding rheostat 12.

[0051] The control center is fixed inside the protective box 20, near the sliding rheostat 12. It uses an embedded microprocessor (such as STM32F103) as its core and is connected via data cables to the laser scattering sensor 2, the fixed motor 3, the electric push rod 8, the sliding rheostat 12, and the bag filter 1's electrical control system. Its core functions include:

[0052] Data reception and processing: Real-time reception of dust concentration data from laser scattering sensor 2 and resistance data (corresponding power data) from sliding rheostat 12; calculation of the optimal power corresponding to the current dust concentration using built-in algorithms (such as PID control algorithms) to avoid errors from manual adjustment;

[0053] Module linkage control: When the sensor detection value deviates from the historical data by more than 10%, it is judged that the detection window is contaminated. The fixed motor 3 is driven to start the cleaning module, and the slider 5 is controlled to drive the blowing port 7 to complete 1-2 reciprocating blows. After cleaning, the detection data is recalibrated. Based on the dust concentration calculation results, the extension and retraction command is sent to the electric push rod 8 to adjust the hydraulic pressure and the resistance value of the sliding rheostat 12 to achieve dynamic adaptation of the dust collector power.

[0054] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0055] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A construction bag dust collection device, comprising: Baghouse dust collector; Its features include: a laser scattering sensor, which is installed inside the inlet of the bag filter, and uses light scattering to detect the dust concentration entering the bag filter; A fixed motor is provided with a fixed lead screw at its output end. A slider is slidably connected to the surface of the fixed lead screw. A connecting rod is provided inside the slider. A purge port is provided at one end of the connecting rod. The fixed motor drives the purge port to move on the surface of the fixed lead screw through the slider. The purge port cleans the surface of the laser scattering sensor. An electric actuator is installed on one side of the bag filter. One end of the electric actuator is equipped with an oil tank, and a fixed pipe is installed on one side of the oil tank. A piston rod is slidably connected inside the fixed pipe, and a sliding rheostat is fixedly connected to one end of the piston rod. The electric actuator pushes the piston rod to move inside the fixed pipe through the hydraulic oil inside the oil tank. The piston rod drives the slider of the sliding rheostat to move, thereby indirectly adjusting the power of the bag filter.

2. The construction bag dust collection equipment according to claim 1, characterized in that: The output end of the fixed motor is fixedly connected to a coupling, which is fixedly connected to one end of a fixed lead screw. One end of the fixed lead screw is rotatably connected to a fixed box, and the fixed motor is fixedly connected inside the fixed box.

3. The construction bag dust collection equipment according to claim 1, characterized in that: The bottom of the slider is slidably connected to a guide rail, which is fixedly connected inside the fixed box. The bottom of the slider has a first groove that matches the guide rail.

4. The construction bag dust collection equipment according to claim 1, characterized in that: The slider has a rotating groove in the middle that matches the connecting rod. A torsion spring is fixedly connected inside the rotating groove and is fixedly connected to one side of the connecting rod.

5. The construction bag dust collection equipment according to claim 1, characterized in that: A piston plate is fixedly connected to one end of the electric push rod. The piston plate is slidably connected inside the oil tank. A connecting pipe is fixedly connected to one end of the oil tank. The connecting pipe is fixedly connected to one end of the fixed pipe.

6. The construction bag dust collection equipment according to claim 1, characterized in that: A fixing spring is fixedly connected inside the fixing tube, and the fixing spring is fixedly connected to one end of the piston rod.

7. The construction bag dust collection equipment according to claim 1, characterized in that: A protective box is fixedly connected to the bottom of the sliding rheostat. A ventilation slot is provided on the side of the protective box near the sliding rheostat. The electric push rod is fixedly connected inside the protective box.

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