43results about How to "Prevent sudden drop" patented technology

The invention relates to an auxiliary frame, in particular to an auxiliary weightlifting frame preventing drop of a barbell. The auxiliary weightlifting frame preventing the drop of the barbell can clamp the barbell, prevent injuries of weightlifting personnel due to the drop of the barbell and avoid smash of a floor. The auxiliary weightlifting frame preventing the drop of the barbell comprises abase, a frame body, a support plate, a bearing pedestal, a rotating shaft, a ratchet wheel and a volute spring, wherein the frame body is fixedly connected with the front side and the rear side of the top of the base symmetrically; a guide hole is formed in the middle of the top of the frame body; the support plate is fixedly connected with the left side of the outer top of the frame body; and the bearing pedestal is fixedly connected with the upper part of the support plate in an embedded manner. According to the auxiliary weightlifting frame, an arc sleeve and an arc rod are fixed on the barbell; a ratchet is matched with the ratchet wheel, so that the sudden drop of the barbell can be avoided; the injuries of the weight-lifting personnel are also avoided; the barbell can move down moreslowly to be contacted with the floor through a buffering device, so that the smash of the floor is also avoided.

The invention discloses a dynamic rotating speed protection method and system for virtual inertia frequency modulation of a doubly-fed fan. The method comprises the steps that an MPPT curve power reference value is obtained according to the rotating speed of the fan; performing virtual inertia control on the deviation between the actual frequency and the rated frequency to obtain an additional active reference signal added on the basis of the MPPT curve power reference value; performing dynamic rotation speed protection on the fan electromagnetic power actually output at the previous moment, the rotation speed of the fan and the product of delta f and the virtual inertia control differential coefficient to obtain output power; According to the power reference value, the extra active powerreference signal and the output power, obtaining the electromagnetic power output by the fan at the current moment. The output power of the fan can slowly drop to the maximum power tracking curve according to the change of the rotating speed of the rotor in the frequency modulation process, excessive reduction of the rotating speed of the fan is avoided, the fan can automatically recover to the original maximum power point after frequency modulation is finished, and therefore the stability and economical efficiency of the fan in the frequency modulation process are guaranteed.

The invention relates to the automobile spare tire external support field, particularly to a spare tire protection and lifting fixing device. The spare tire protection and lifting fixing device comprises a mounting support assembly, a transmission mechanism assembly, a pallet assembly and a steel wire rope. The mounting support assembly comprises a large support, a small support and a transmission pipe, wherein the large support and the small support are fixedly connected to an automobile body and fixedly connected through the transmission pipe; the transmission mechanism assembly is fixedly mounted on the large support, a main shaft in the transmission mechanism assembly is drivingly connected with a transmission disk which is connected with an inner gear disk through gear transmission, and the outside of the inner gear disk is provided with a wire slot; and one end of the steel wire rope is connected with the pallet assembly, the other end of the steel wire rope penetrates through the transmission pipe and is connected with the wire slot of the inner gear disk in a winding mode, and the disk piece of the inner gear disk is provided with lightening holes. According to the spare tire protection and lifting fixing device, the transmission mechanism is reasonable, the weight of moving parts can be lightened through the lightening holes, and labor-saving operation and smooth and stable transmission are achieved.

A pole climbing machine belongs to the climbing machine field; the pole climbing machine consists of a concave chassis, a pole climbing frame, a clamping mechanism and a guide claw mechanism; the concave chassis is connected with the pole climbing frame in a welding manner to form a groove-shaped space; a column is fixed in the groove-shaped space; the clamping mechanism is provided with two 90-degree arranged sliding rails; when the clamping mechanism clamps the column, a dead point exists, and the machine can be prevented from falling off through the dead point; a gear train structure of thechassis can move on the plane in all directions; the pole climbing machine is novel in structure, easy to operate and more stable in pole climbing, and the danger is reduced.

The invention relates to a jack with a brake device. The jack with the brake device comprises a base and left and right wallboard parts arranged on the left side and the right side of the base respectively, a lifting arm part and an oil pump device are arranged between the left and right wallboard parts, the rear part of the lifting arm part is movably connected with a piston rod of the oil pump device, a stop part and a pedal part for controlling the stop part are further arranged between the left and right wallboard parts, the stop part comprises a stop arm, the rear end of the stop arm is pivoted to the left and right wallboard parts, a non-slip part is arranged at the front section of the stop arm, the rear portion of the lifting arm part is matched with the non-slip part, the pedal part is pivoted to the left and right wallboard parts, the non-slip part of the stop arm can be separated from a connecting shaft by treading on the pedal part, a reset mechanism is arranged between thestop arm and the left and right wallboard parts, and the reset mechanism applies upward acting force to the stop arm, so that the non-slip part is matched with the connecting shaft. The brake deviceprevents the jack from suddenly falling when a hydraulic system breaks down, thereby playing a role in protecting.

The invention discloses an air pressure meter belt type watch. The air pressure meter belt type watch comprises a watch disc, a storage watch belt and a plug-in watch belt. The upper ends of the storage watch belt and the plug-in watch belt are movably fixed to the watch disc in a hinge connection mode. A hollow sliding way is formed in the storage watch belt. A containing cavity, a spring positioning groove, an air hole passageway and a through passageway are formed in the plug-in watch belt. An opening in one end of the air hole passageway is located in the bottom of the lower end of the plug-in watch belt, and an opening in the other end of the air hole passageway is in through connection with the through passageway. A special-shaped pressing sealing part is further arranged in the containing cavity. The special-shaped pressing sealing part is composed of a belling boss, a connecting center shaft and an air plugging stretching table. The special-shaped pressing sealing part and theplug-in watch belt are movably fixed into the containing cavity through the connecting center shaft in a hinge connection mode. A reset spring is further arranged in the containing cavity, one end ofthe reset spring is located in the spring positioning groove, and the other end of the reset spring abuts against the belling boss. The air plugging stretching table abuts against an air inlet and outlet in one end of the through passageway, and completely covers the whole air inlet and outlet.

The invention discloses a water conservancy gate with an emergency treatment function capable of rising and falling with water level. The water conservancy gate with the emergency treatment function capable of rising and falling with the water level includes a water storage body; and an impounding reservoir with a leftward opening is arranged in the water storage body. The invention discloses a water conservancy gate which is mainly used in water conservancy and hydropower and can be discharged in time, which can drive up and down sliders to rise and fall through the height of the water levelin the process of water storage, so as to affect and drive the rise and fall of the lifting gate; meanwhile, the rotation of water flow blades and an abutment mechanism are used for realizing the abutment between an auxiliary inclined block and a main inclined block, which can avoid sudden drop when the lifting gate is open; the waste can be filtered and processed through a filter plate, which prevents the waste from continuing to pollute the water source; and meanwhile, the drainage in emergency situations can be realized through an active rod, so that the water storage and drainage work canbe carried out more safely.

The invention provides a noise reduction device for reducing noise in a steel pipe transportation process, which comprises a drying pit pipe placing area noise reduction module, a passivation pipe placing area noise reduction module and a packaging area noise reduction module, and is characterized in that a steel pipe is firstly conveyed to the drying pit pipe placing area noise reduction module by a steel pipe conveying device; and then, the pipe is conveyed to the passivation pipe placing area noise reduction module through a chain conveying belt, and finally, the pipe is conveyed to the packaging area noise reduction module through a roller way. The steel pipe conveying device has the beneficial effects that the noise reduction module can conduct blocking between two steel pipes or between the steel pipe and a steel plate, large noise caused by collision is avoided, the quality of each steel pipe can be guaranteed to a certain degree, and the situation that the outer portions of the steel pipes are damaged due to collision in the conveying process is avoided.

It is an object of the present invention to provide a compact card connector in which the width and height of the connector can be reduced, and the size of the connector in the depth direction can also be reduced. In the card connector (1), the cam mechanism (50) includes a heart-shaped cam groove (42) formed in the slider (40) and is pivotally supported by the housing (10) and along the cam groove (42). Oscillating cam lever (51). The locking member (60) has a cantilever form, one end of which is fastened to the slider (40), and the movement range of the free end at the other end overlaps with the cam groove (42).

The invention relates to a folding easy-maintenance street lamp. A lamp post is in a long hollow cylindrical tubular shape, and an opening and closing folding door is arranged on the middle upper part of the side wall of the lamp post; a core column is arranged in the lamp post, the core column is designed into three sections, two adjacent sections of the core column are hinged end to end, and the length of the three sections of the core column after vertical unfolding is greater than that of the lamp post; a lamp body is fixed to the top end of the core column, a rain cover is arranged below the lamp body, and the inside diameter of the rain cover is greater than the outside diameter of the lamp post. According to the folding easy-maintenance street lamp, the lamp post of the street lamp can be conveniently folded and lowered, a special vehicle with a lifting platform is not needed, the maintenance cost is low, and the danger that maintenance personnel possibly fall off is avoided; and in addition, the street lamp can be maintained in time in case of a failure without waiting for the special vehicle, and only the lamp post of the street lamp needs to be supported by a long post, so that the street lamp can be maintained in time, and normal road lighting for urban residents cannot be influenced.

The invention belongs to the field of bridge construction, relates to a construction equipment technology and aims to solve the problem that an existing scaffold is not provided with a corresponding anti-falling mechanism to provide anti-falling protection, in particular to a supporting scaffold for bridge construction and an operation system of the supporting scaffold, the supporting scaffold comprises a supporting box body, and a jacking mechanism and a pulling detection mechanism are arranged in the supporting box body; the jacking mechanism comprises a bearing plate slidably connected between the inner side walls of the bearing box body, two symmetrical hydraulic cylinders are fixedly installed between the bottom of the bearing plate and the inner bottom wall of the bearing box body, the hydraulic cylinders are used for jacking up the bearing plate to support the bearing columns and the balance arms, the evenly-distributed bearing columns are fixedly installed on the top of the bearing plate, and the balance arms are fixedly installed on the top of the bearing plate. The top of the supporting column penetrates through the inner top wall of the supporting box body and extends to the outside of the supporting box body; according to the working platform, the steel cable penetrates through the first wrapping hole and the locking ring to lock the balance plate, so that the connection tightness of the balance plate and the supporting box body is guaranteed, and the lifting stability of the working platform is improved.

The invention relates to the technical field of balance weight devices, in particular to a balance weight anti-falling device and a balance weight mechanism. The balance weight anti-falling device comprises a shell, the shell comprises an inlet and an outlet, a pipeline is arranged in the shell, the inlet communicate with the outlet through the pipeline, the inlet is used for communicating with an air supply source, and the outlet is used for communicating with a balance weight air cylinder; and the balance weight anti-falling device further comprises a control valve, and the control valve is connected to the pipeline, wherein the pipeline comprises a first pipeline and a second pipeline, the first pipeline communicates with the inlet and the control valve, the second pipeline communicates with the balance weight air cylinder and the control valve, and the control valve can be automatically closed when gas is cut off or power is cut off, so that gas is blocked in the second pipeline. The balance weight anti-falling device can enable the balance weight air cylinder to be kept at an original position during emergency power failure or air failure, and the situation that equipment such as a machine tool and an elevator falls suddenly and damages products or parts is avoided.

The invention discloses a combined double-layer switch cabinet which comprises a main cabinet body, two symmetrical cabinet doors are arranged on the front face of the main cabinet body, a PLC is arranged on the side face of the main cabinet body, two symmetrical limiting blocks are fixedly installed on the inner bottom wall of the main cabinet body, an installation groove is movably connected between the close side faces of the two limiting blocks, first electric push rods are fixedly mounted on the inclined faces of the two mounting blocks correspondingly, an adjusting plate is fixedly mounted at the top of the sliding rail, a mounting frame is fixedly mounted at the top of the adjusting plate, and a fixing frame is fixedly mounted at the top of the mounting frame. A lifting adjusting plate of the adjusting plate can be controlled to ascend or descend, meanwhile, limiting rollers on the two sides are limited by the limiting plates, ascending and descending of the adjusting plate aremore stable, meanwhile, friction between the limiting rollers and the inner wall of the sliding groove is rolling friction, and abrasion between equipment parts is reduced.

The invention belongs to the field of net rack mounting, and relates to the technology of jacking equipment, in particular to a jacking device used for mounting of a steel structure net rack and a using method of the jacking device. The jacking device comprises a jacking mechanism, the jacking mechanism comprises a base, rolling wheels, a jacking component, a top plate and two side plates, the twoside plates are fixedly mounted on the two sides of the top face of the base correspondingly, the jacking component is arranged between the two side plates, the top plate is fixedly mounted between the tops of the two side plates, and a material bin is arranged on the top face of the top plate. The material bin is hinged to a mounting seat, and a first electric push rod is arranged in a groove ofthe mounting seat, the material bin can automatically rotate and incline for discharging after being jacked to a mounting platform, and therefore manual discharging is not needed after the material bin is jacked to the mounting platform, the working pressure of workers is reduced, and the discharging speed can be increased.

Prevent the sudden drop of the actuator by discharging high-pressure hydraulic fluid into the channel on the liquid supply side of the actuator when the actuator is lowered, and provide a device installed on the channel between the hydraulic pump and the actuator and control the drive of the actuator The main spool shaft barrel, a poppet valve installed on the channel between the main spool shaft barrel and the actuator to prevent the actuator from descending, and a spool shaft barrel installed between the back pressure chamber and the return path of the poppet valve. When connecting the back pressure chamber and the channel on the discharge port of the main valve core shaft barrel, and a liquid flow reduction channel connecting the back pressure and the return flow channel when the valve core shaft barrel is switched, so as to reduce the hydraulic fluid discharged from the actuator.