32 results about "Return work" patented technology

The invention relates to the technical field of grinding machines, in particular to a coreless grinding machine for machining a small cylinder sleeve, which comprises a grinding machine base, a grinding wheel and a guide wheel, the grinding wheel and the guide wheel are both arranged on the grinding machine base, a workpiece supporting plate is arranged between the grinding wheel and the guide wheel, and a return lifting shaft is arranged above the workpiece supporting plate between the grinding wheel and the guide wheel. The return lifting shaft is parallel to the axis of the grinding wheel, and a mounting hidden groove is formed in the return lifting shaft; after the air cylinder sleeve moves to the position of the cylinder sleeve position sensor through grinding machining, the return lifting shaft is used for controlling the air cylinder sleeve to be lifted, the air cylinder sleeve automatically slides and returns to the side where a worker is located, and occupation of the worker for receiving the machined air cylinder sleeve on the other side is reduced.

The utility model relates to the technical field of intelligent padlocks, particularly discloses an intelligent charging cabinet suitable for borrowing and returning of an intelligent padlock, and solves the problem that an existing intelligent charging cabinet suitable for borrowing and returning of the intelligent padlock cannot indicate whether the intelligent padlock is placed at a correct position and is in a charging state or not. The intelligent padlock comprises a cabinet body, a plurality of storage boxes are arranged in the cabinet body, a sealing door is arranged on one side of each storage box, an intelligent padlock body is placed in each storage box, and an indication assembly is arranged in each storage box. The indicating assembly comprises an indicating shaft and a fixing plate, the indicating assembly is used for prompting correct placement of the intelligent padlock body, whether the placement position of the intelligent padlock body is correct or not can be indicated through the indicating assembly, and only when the intelligent padlock body is correctly placed, the closing door can close the opening of the storage box, so that the intelligent padlock body is prevented from being damaged. And the return work of the intelligent padlock can be completed.

The utility model discloses an air conditioner oil blocking structure, a heat management system and a vehicle, and belongs to the technical field of vehicles, the air conditioner oil blocking structure comprises an oil blocking structure body and a guide part, the oil blocking structure body defines an inner cavity, and a compressor channel and a branch channel communicating with the inner cavity; the guide part comprises a first section extending into the inner cavity; when a refrigerant coming out of the evaporator enters the inner cavity, carried refrigerant oil can cross the branch channel under the guiding action of the first section, so that at least most of the refrigerant oil enters the compressor from the compressor channel, oil return work of the compressor is completed, the refrigerant oil can be effectively prevented from entering the branch channel, oil return of the compressor is ensured, and the service life of the compressor is prolonged. Moreover, the oil-resistant structure is simple and compact in structure, small in occupied space and suitable for the installation condition with the limited space, the defects of a traditional structure can be effectively overcome, and the technical blank of oil-resistant design under the condition that the installation space of an automobile air-conditioning system is limited is filled up.

The invention discloses an internal combustion engine plunger and barrel assembly matching degree calculation method, device, equipment and medium, and belongs to the technical field of data processing with specific functions.The internal combustion engine plunger and barrel assembly matching degree calculation method comprises the steps that the plunger and barrel assembly matching clearance deformation Gi of the first, second,..., ith,... and Mth plunger and barrel assembly oil inlet, oil supply and oil return work cycles is calculated, according to the design fit clearance G of the plunger and barrel assemblies, the plunger and barrel assembly fit degrees Gd1, Gd2,..., Gdi,... and GdM of the first plunger and barrel assembly, the second plunger and barrel assembly, the ith plunger and barrel assembly, the ith plunger and barrel assembly, the Mth plunger and barrel assembly and the Mth plunger and barrel assembly in the oil inlet, oil supply and oil return work cycle are calculated; according to the method, the matching degree of the internal combustion engine plunger and barrel assembly can be calculated and determined, and the leakage or clamping stagnation risk of the plunger and barrel assembly is reduced.

The invention relates to a hydrodynamic retarder comprising a rotor and a stator which are arranged in a two-part housing, namely a rotor housing part and a stator housing part, said rotor and stator forming a toroidal working chamber which can be filled with a working medium via an inlet channel and / or a pump, the invention relates to a retarder for a motor vehicle, in particular a motor vehicle, having a rotor housing part and a working chamber, which can be evacuated via an outlet channel and / or a return channel, which connects a skimming bore in the rotor housing part to a reservoir in such a way that the working medium can be discharged from the working chamber, the rotor being movably positioned on the retarder shaft and being movable from a non-braking operating position into a braking operating position. According to the invention, means are provided by means of which a volumetric flow can be discharged from the toroidal working chamber, a part of the volumetric flow entering the annular gap via a running gap between the rotor and the rotor housing part, and a part of the volumetric flow returning into the working chamber via the annular gap.

The invention discloses a construction method for coal pillar-free mining along a lane with a thick coal seam with a large inclination angle, comprising the following steps: step 1: excavating a transport chute for a production return working face in the coal seam, and reserving a wall space for casting a soft film concrete wall on the side of the next production return working face; step 2: arranging a model in the reserved wall space in the transport chute and casting the soft film concrete wall; step 3: drilling a top cut pressure relief hole in a roof 0.5 meters away from the soft film concrete wall in the transport chute; step 4: during mining, charging and blasting the top cut pressure relief hole closely following the mining face, so that a crack is formed between the goaf and the unmined area, so as to facilitate the timely collapse of the roof; step 5: after mining, the roof collapses along the top cut pressure relief hole; step 6: excavating a return air chute for a production return working face along the other side of the soft film concrete wall; step 7: excavating a transport chute at the next production return working face, and reserving a wall space for casting a soft film concrete wall on the side of the next production return working face.

The present invention relates to the field of spinning processing technology, and specifically to a ball spinning machine, comprising a frame for support, a core mold that can be raised and lowered is provided therein, a tube blank can be sleeved on the outside of the core mold, a spinning assembly that can rotate is installed below the core mold, and a material return mechanism that can be raised and lowered, the material return mechanism can clamp the outer ring of the tube blank, a slider that can be raised and lowered is installed on the material return mechanism, a plug rod that can be extended and retracted along its own axis is rotatably installed on the slider, the plug rod can rotate between horizontal and vertical, and the upper end of the core mold has a limit groove. In the spinning working state, the slider slides to the lower end of the material return mechanism, the plug rod is extended and horizontally extended, the plug rod is inserted into the positioning groove and the limit groove at the same time, and the material return mechanism rises and falls synchronously with the core mold. In the material return working state, the slider slides to the upper end of the material return mechanism, the plug rod retracts to only insert into the positioning groove, the material return mechanism clamps the outer ring of the tube blank, and the material return mechanism completes the material return of the tube blank.

The utility model relates to the field of press fit dies, in particular to a press fit die material returning structure which comprises a machine frame, a hydraulic column is arranged on the top of the machine frame, a material returning mechanism is installed on one side of the machine frame, a base is installed at the bottom of the machine frame, a lower die assembly is installed on the top of the base, and an upper die base is arranged on the top of the lower die assembly. A collecting pool is formed in one side of the base, the lower die assembly comprises a lower die base and a die cavity, the die cavity is formed in the lower die base, and a movable part is arranged in the die cavity; the material returning mechanism is arranged on the mechanism, an electric telescopic rod in the material returning mechanism can be conveniently used for driving a round rod and a round plate to move, a workpiece is pushed out of the die cavity, meanwhile, a notch is formed in the die cavity, the workpiece can be smoothly pushed out of the notch, and the material returning work of the workpiece is completed in cooperation with the formed collecting pool.

The utility model discloses an anti-skidding type plate rolling device which comprises a support and a guide sleeve, a transferring assembly is installed on the support, the transferring assembly comprises a fixed roller and a first motor, a clamping assembly is installed on the top of the fixed roller, the clamping assembly comprises a movable roller and a sliding block, a limiting assembly is installed on the inner side of the support, and the sliding block is installed on the limiting assembly. The limiting assembly comprises a sliding groove and a first spring, a pushing assembly is installed at the top of the support and comprises a rotating roller and a second motor, and a plate rolling assembly is installed at the top of the rotating roller. And the third motor pushes the pressing block upwards through the lead screw, so that the plate roll is separated from the rotating roller, then the plate roll is pushed outwards from one end of the winding roller, the material returning work of the plate roll can be rapidly completed, and the plate winding device is suitable for winding machining of plates.

The utility model discloses a valve body casting with a flow speed control function, which comprises a control valve main body, a flange is fixedly connected to the surface of the control valve main body, a fixing frame is fixedly connected to the inner wall of the control valve main body, the control valve main body is connected with a pipeline through the flange, and the impact force of fluid is reduced through the impact of the fluid and a backflow prevention mechanism. The driving assembly is started to drive the adjusting ring and the limiting mechanism to move transversely through the threaded rod and the connecting frame, the flow speed of the fluid can be controlled and adjusted by controlling the size of a gap between the adjusting ring and the backflow preventing mechanism, and the backflow fluid pushes the backflow preventing mechanism to move rightwards to make contact with the adjusting ring and extrudes the elastic limiting assembly at the same time. When the valve body casting is used, the sealing and non-return work can be carried out, the aims of conveniently controlling the flow speed of fluid and preventing backflow are achieved, and the problem that the inner wall of the valve body is damaged due to the fact that an existing valve body casting is difficult to control the flow speed of the fluid and difficult to prevent the backflow of the fluid is solved.

The utility model discloses a seal welding sealing nail structure which comprises a top cover plate, a liquid injection opening is formed in the top cover plate, the liquid injection opening is divided into a circular truncated cone section and a cylindrical section, a sealing nail is inserted into the liquid injection opening and is divided into a sealing cover and a sealing nail body, the sealing nail body is inserted into the cylindrical section of the liquid injection opening, and the sealing cover is connected with the sealing nail body. The sealing cover is clamped in the circular truncated cone section, the top of the sealing cover extends outwards and is erected on the top face of the top cover plate, and a groove is formed in the position, located on the outer side of a welding seam of the sealing cover and the top cover plate, of the top face of the top cover plate. According to the utility model, the welding mode of the battery cell liquid injection port is optimized, the electrolyte pollution of the liquid injection port and the adverse effect of the gap size of the liquid injection port on the sealing welding are reduced, the welding difficulty is reduced, the welding yield is improved, the reworking operation is simplified, and the stability and firmness of the welding of the liquid injection port are ensured.

A method for managing a state of charge of a battery of an electric work vehicle in preparation for returning to work at a return to work time. Data including an expected date and time of the return to work is obtained from an output of a user interface and used to calculate a duration of an expected immobilization of the electric work vehicle. A charging rate is determined based on the duration of the expected immobilization of the work vehicle and a target charge increment. A charging start time is calculated such that at the return to work time, an actual state of charge of the battery is a target operational state of charge value. A temperature of the battery is adjusted such that the battery is at a target temperature at the charging start time. A charging cycle is initiated at the charging start time.

The invention relates to the technical field of engineering machinery, and discloses a variable-amplitude hydraulic system, engineering machinery and a variable-amplitude control method. The variable-amplitude hydraulic system comprises a variable-amplitude oil cylinder, a pressure detection module, an oil way module, a first pilot oil way module and a control module. The pressure detection module is used for detecting the oil pressure of the rod cavity; the oil way module comprises a first oil way module and a first balance valve, the first oil way module is connected with a rod cavity of the variable-amplitude oil cylinder, and the first balance valve is arranged on a first oil way; the first pilot oil way module is connected with the control end of the first balance valve. The control module is configured to send out a stop signal used for controlling stopping of current work under the condition that the oil pressure detected by the pressure detection module is larger than a preset safety value, and / or control the pilot oil way module to open an oil return working position of the first balance valve for oil return. According to the variable-amplitude hydraulic system, when the pressure of a variable-amplitude oil cylinder rod cavity is larger than a preset safety value, oil return is actively started, equipment safety is protected, and the service life is prolonged.

A method for managing a state of charge of a battery of an electrically powered work vehicle, the battery being ready to return to work at a return to work time coinciding with an end of a fixed duration. A charging mode is selected through a user interface. An initial state of charge of the battery and a target operating state of charge of the battery are used to calculate a target charge increment. A charging cycle comprising a charging rate is selected based on the charging mode and the target charge increment. A charging start time is calculated such that at the return to work time, an actual state of charge of the battery corresponds to the target operating state of charge. At the charging start time, a temperature of the battery is adjusted to a target temperature. The charging cycle is started at the charging start time.

The utility model relates to the technical field of proximity detector production, and provides a proximity detector plug assembly tool and a proximity detector assembly production line, and the assembly tool comprises a plug guide body, a nut sleeve and a driving device. And the plug guide body is matched with the plug-in mounting part of the proximity detector plug so as to guide and position the plug-in mounting part. The nut sleeve is matched with a fastening nut of the proximity detector plug so that the fastening nut can be sleeved with the nut sleeve. The driving device is connected with the nut sleeve and used for driving the nut sleeve to rotate and translate. According to the tool for assembling, on one hand, the driving device drives the nut sleeve to rotate so that the fastening nut can be screwed, the torque is easy to control and more stable, the fastening nut and the nut sleeve can be effectively buckled, the assembling efficiency is improved, and the end face of the box body is effectively protected; and on the other hand, the insertion part of the proximity detector plug is inserted into the plug guide body in the assembly process, so that the direction of the plug can be effectively prevented from deviating, reworking operation is avoided, and the assembly efficiency is further improved.

The invention provides an electric control shock absorber and a vehicle, the electric control shock absorber comprises two valve devices connected to an outer cylinder barrel, one valve device is used for communicating one inner sub-cavity with an outer cavity, and the other valve device is used for communicating the other inner sub-cavity with the outer cavity; each valve device comprises a main flow channel, an oil return flow channel and a valve port channel with adjustable flow capacity, the main flow channel is communicated with the corresponding inner sub-cavity, and the oil return flow channel and the valve port channel are communicated with the outer cavity; when the piston is switched between the compression stroke and the reset stroke, one of the two inner sub-cavities is a high-pressure inner sub-cavity, and the other inner sub-cavity is a low-pressure inner sub-cavity; a main flow channel of the valve device communicated with the high-pressure inner sub-cavity is disconnected from the oil return flow channel and is communicated with the valve port channel; and a main flow channel of the valve device communicated with the low-pressure inner sub-cavity is disconnected from the valve port channel and is communicated with the oil return flow channel. By adopting the mode in the embodiment of the invention, each valve device can be switched between the pressure relief working condition and the oil return working condition corresponding to the compression stroke and the reset stroke of the piston, so that the valve device can realize bidirectional conduction of the inner sub-cavity and the upper cavity.

The utility model discloses a self-adaptive sweeper, which relates to the technical field of conveyor belt cleaning, and comprises a plurality of scraper components, each scraper component comprises a mounting seat, a tool apron, a scraper and an elastic component, the tool apron is rotatably arranged on the mounting seat, the scraper is arranged on the tool apron, and the elastic component is arranged on the mounting seat. The elastic assembly is used for applying elastic force rotating towards one side of the scraper blade part to the knife holder; the plurality of scrapers are linearly distributed; the scraper has the function of self-adaption according to the condition of a return working face of the conveying belt, damage to the surface of the conveying belt is small, and the service life of the conveying belt is prolonged.

The present application relates to the technical field of wood cutting auxiliary device, disclose a kind of cutting auxiliary device for furniture production, including sawing machine, the middle position of the sawing machine is fixedly provided with saw bench, the upper end of the saw bench is placed with wood, control mechanism is provided on the saw bench, drive mechanism is provided on the control mechanism, the control mechanism includes the hydraulic cylinder fixedly arranged in the front end of saw bench support, the upper side of the hydraulic cylinder telescopic rod is fixedly provided with fixed sleeve, the rear end of the fixed sleeve is fixedly provided with movable plate, two groups of transmission rods are rotatably arranged in the inner side of the movable plate, two groups of the transmission rod front side are rotatably provided with synchronous wheel, and two groups of the synchronous wheel outer side are sleeved with synchronous belt.The cutting auxiliary device for furniture production of the application is used in cooperation with the conveying assembly and the driving assembly, promotes cutting work, reduces the harm to hand, and the two pieces of cut plate can be driven to move back, to realize automatic return work.

To provide a removal method of a closing member which enables safe removal of the closing member in a state that flow is not interrupted, and to provide a working fluid device used in the removal method of the closing member.SOLUTION: A method of removing a closing member 51 from a fluid pipe 1 in a state that flow is not interrupted, includes: an installation step in which actuators 110 of a working fluid device 90 including a working fluid circuit 100 for removing the closing member 51 are installed in the closing member 51 so as to make a pair in a radial direction of the closing member 51; a delivery step in which working fluid is branched and delivered from a pump 120 of the working fluid device 90 to the respective actuators 110 and the returned working fluid is delivered from the respective actuators 110 and joined; a restriction step in which the returned working fluid delivered from the respective actuators 110 and joined in the delivery step is restricted by fluid control means 150; a closing step in which an upstream side in the fluid pipe 1 is closed in a state that the returned working fluid delivered from the respective actuators 110 and joined is restricted by the fluid control means 150; and a removal step in which the closing member 51 is removed.SELECTED DRAWING: Figure 7

A combine harvester includes a control device and a portable terminal. The control device functions as a discharge run control unit for doing an automatic discharge run based on a discharge route or a return run control unit for doing an automatic return run based on a return route. The portable terminal is provided with a control device, and the control device functions as a discharge route creation unit that creates a discharge route for doing an automatic discharge run in a non-work state from a given transfer position, where a work run is interrupted, to a discharge position as a target position, or a return route creation unit that creates a return route for doing an automatic return run in a non-work state from the discharge position as the given target position to a given return position for returning to the work run.

The invention discloses a force sense feedback method and device, a medium and a steer-by-wire system, and relates to the technical field of steer-by-wire. The method is applied to a steer-by-wire system in a vehicle and comprises the steps that the steering angle and the steering angular speed of a steering wheel in the steer-by-wire system are obtained; determining a steering condition based on the steering angle and the steering angular velocity; if the steering working condition is a forward working condition, determining a compensation torque based on the steering angle, the steering angular velocity and the current vehicle speed; if the steering working condition is a return working condition, determining a friction torque based on the steering angle, the steering angular velocity and the current vehicle speed; according to the compensation torque or the friction torque, a reference feedback torque is adjusted, a target feedback torque is obtained, and the reference feedback torque is obtained at least based on the steering angle and the steering angular speed; and applying the target feedback torque to the steering wheel to simulate a feedback force feeling corresponding to the steering condition. The center position feeling of the steering wheel can be remarkably enhanced, the hand feeling influence caused by steering delay is reduced, and therefore the overall steering performance is improved.

The invention discloses a harvester return operation control method, device and equipment and a medium. The method comprises the following steps: when driving to a pre-docking area along a return operation route, stopping driving, and collecting a current positioning image; determining an image positioning matching result according to the current positioning image and a target image collected at an operation interruption point; when the matching result is unsuccessful, performing first pose adjustment on the pose according to the pose difference between the standard pose and the current pose acquired in real time; when the matching result is successful, performing second pose adjustment on the pose according to the pose difference between the standard pose and the current pose acquired in real time and the image difference between the current calibration image acquired in real time and the target image; and after the adjustment is completed, recovering the execution of the operation of the operation interruption point. According to the embodiment of the invention, efficient and accurate return operation of the harvester can be ensured, and the operation quality and efficiency are improved.

The application relates to the technical field of grinding machines, in particular to a coreless grinding machine for small cylinder sleeve machining, which comprises a grinding machine base, a grinding wheel and a guide wheel, the grinding wheel and the guide wheel are arranged on the grinding machine base, a workpiece supporting plate is arranged between the grinding wheel and the guide wheel, a return lifting shaft is arranged above the workpiece supporting plate between the grinding wheel and the guide wheel, the return lifting shaft is parallel to the axis of the grinding wheel, and a mounting hidden groove is arranged in the return lifting shaft; after the cylinder sleeve grinding machining moves to the position of a cylinder sleeve position sensor, the cylinder sleeve is lifted by the return lifting shaft, and automatically slides back to the side where the staff is located, so that the personnel on the other side for taking the machined cylinder sleeve is saved.

The utility model discloses an auxiliary device for installing equipment under a rail transit vehicle, which comprises a movable base connected with a supporting platform through a lifting device. The movable base comprises a frame. Moving wheels are arranged at the bottom of the frame. The lifting device comprises a folding lifting support, one end of the bottom of the folding lifting support is fixed to one side of the frame, the other end of the bottom of the folding lifting support is slidably arranged in a sliding groove in the frame, and the folding lifting support is provided with a telescopic rod used for controlling lifting of the folding lifting support. Sliding long guide columns are arranged on the two sides of the long edge of the supporting platform respectively, a front transverse sliding short guide column and a rear transverse sliding short guide column are installed on the sliding long guide columns in an inserted mode, the two transverse sliding short guide columns are movably sleeved with a laser projector, and threaded holes are evenly distributed in the surface of the supporting platform. The auxiliary device is good in universality, can be applied to installation and positioning of equipment under various rail transit vehicles, can be used in different vehicle types and different working environments, and can effectively avoid the problems that when equipment is installed in the prior art, positioning is not accurate, consumed time is long, the number of operators is large, equipment installation does not meet the design requirement, and the installation cost is low. Therefore, a series of repairing and reworking operations are generated. And the manufacturing cost, the time cost and the resource waste of enterprises are effectively reduced.

The invention discloses a linkage switchable composite drilling machine valve. The linkage switchable composite drilling machine valve mainly comprises a rotary working unit for controlling a hydraulic motor, a feeding and returning working unit for realizing feeding and returning of a working device, and a linkage control working unit capable of realizing linkage switching. The combined drilling machine valve relates to the technical field of drilling machine valves, a linkage control work unit integrates a linkage switchable function, and the purposes that a clamp holder is independently opened, a hydraulic chuck is independently opened, and the clamp holder is not controlled when a motor rotates forwards can be achieved through a manual rotary valve. Action linkage of the drilling machine is achieved, and the clamp holder and the hydraulic chuck can be independently controlled. Various functional requirements of the drilling machine are perfected, the application range is expanded, and the drilling machine has the characteristics of multiple functions, simplicity and convenience in operation and high intelligent degree, and can remarkably improve the working efficiency and reduce the use cost.

The hydraulic system of the present application returns working oil discharged from an actuator to a tank via an oil cooler, and includes a throttle member, a flow path connecting the throttle member and the tank via the oil cooler, a discharge flow path connecting the throttle member and the tank, and a switching valve switching the flow direction of the working oil in accordance with a negative control pressure generated by the throttle member. When the negative control pressure generated by the throttle member is equal to or greater than a reference, the switching valve causes the working oil to flow to the flow path. When the negative control pressure is less than the reference, the switching valve blocks the inflow of the working oil from the throttle member to the flow path, and causes the working oil to flow to the discharge flow path.

The invention relates to a control method of an electric tool, the electric tool and electronic equipment, the electric tool comprises an operation part, a driving mechanism and a glue pushing part, and the method comprises the steps that in response to an operation signal of the operation part, the driving mechanism is controlled to work according to a current speed parameter so as to drive the glue pushing part to advance; responding to the driving mechanism to stop working, and obtaining the forward working time length of the driving mechanism; according to the forward working duration and / or the speed parameter of the driving mechanism, determining the rollback working duration of the driving mechanism; and controlling the driving mechanism to work according to the rollback working duration so as to drive the glue pushing piece to roll back. According to the technical scheme, after the driving mechanism stops advancing work, the driving mechanism is controlled to carry out returning work according to the advancing work duration and / or the speed parameter of the driving mechanism, returning of the glue pushing piece can be matched with the operation working condition, and the operation experience is improved.

Workbench (1), comprising a work chamber (3) surrounded by a housing (2), wherein the work chamber (3) is accessible through a working opening (4), comprising an air supply device (12) through which pre-assembled supply air can flow into the work chamber (3), and an exhaust air device (14) through which exhaust air can be extracted from the work chamber (3), wherein the exhaust air device (14) is designed such that exhaust air can be at least partially discharged from the workbench (1) and at least partially discharged into the work chamber (3) via an air supply element (15), characterized in that the exhaust air device (14) has an exhaust air pipe (16) which includes a branching section (17) at which the exhaust air pipe (16) is divided into two partial pipes (18), wherein at least one control damper (19) is arranged in each of the partial pipes (18) with which the ratio between exhaust air discharged from the workbench (1) and the air entering the work chamber (3) is controlled. The exhaust air recirculated into the work area is controllable.

The utility model relates to the technical field of comprehensive dust prevention of mines, and discloses a dust removal device for an air return working face. The dust removal device for the air return working face comprises an air outlet plate, three control valves are fixedly installed on one side of the air outlet plate, an air suction pipe is fixedly installed on one side of each control valve, an air suction opening is fixedly formed in the bottom of each air suction pipe, and an electric annular rotating shaft is movably connected to the bottom of each air suction opening; and a filtering barrel is fixedly mounted at the bottom of the electric annular rotating shaft. Through the operation of the sucking pump, the sucking opening can generate suction force, raised dust generated on the working face is sucked in after larger particles are filtered out through the filtering barrel, and finally the raised dust is discharged through the air outlet pipe, and after the filtering barrel is blocked by dust, the filtering barrel can be driven to rotate through the operation of the electric annular rotating shaft, so that the working face is protected. Therefore, impurities blocked in the middle of the filter barrel can be thrown out through centrifugal force, and the practicability and the anti-blocking effect of the dust removal device for the return air working face are improved.