30results about How to "Avoid falling well accidents" patented technology

A normally-closed type electric car stopper is composed of electric pushers, a control device of the electric pushers, a pulling rod, a rotary shaft and car stop blocks. The two electric pushers are respectively provided with a motor inside, the pulling rod is arranged between two motor pushing rods, a reset spring is arranged between each pushing rod and an upper frame, the lower end of the pulling rod is connected with a connecting rod, the connecting rod is connected with the rotary shaft through a transmission device, the two car stop blocks are arranged on the rotary shaft, and grooves are formed in the corresponding positions of the car stop blocks. The electric pushers are connected with the control device. The normally-closed type electric car stopper has the advantages that automatic control is achieved, the structure is simple, design is reasonable, maintenance is convenient, a whole hydraulic transmission mechanism is located above the ground and dragged by the two electric pushers, and stable and efficient operation of a mine car is guaranteed through multiple protection measures.

The invention discloses a falling-into-well prevention device for an elevator. The falling-into-well prevention device comprises at least one stand column, swing rods and guide wheels, wherein the stand columns are arranged on the hoistway wall on one side of an elevator landing door, at least one swing rod is arranged corresponding to each stand column, and one end of each swing rod is hinged to the corresponding stand column; one guide wheel is arranged corresponding to each swing rod, and each guide wheel is arranged on an elevator car door. Along with the opening of the elevator car door, the guide wheels abut against the swing rods so that each swing rod can swing from a first working position to a second working position, wherein a large included angle is formed between the first working position and the corresponding stand column, and a small included angle is formed between the second working position and the corresponding stand column; along with the closing of the elevator car door, the swing rods are released by the guide wheels so that each swing rod can swing from the second working position to the first working position. Through blocking of the swing rods, it can be effectively avoided that because a passenger enters the elevator by mistake when the landing door is already open but an elevator car is not in a specific position, a falling-into-well accident is caused, and the falling-into-well prevention device is low in manufacturing cost and good in safety.

The invention discloses a safety protection device for a wellhead of a pumping unit. The safety protection device for the wellhead of the pumping unit comprises a base. A plurality of sets of mountingholes are formed in the edge of the base. Fixing columns are arranged in the mounting holes. Circular mounting openings are formed in the upper end face of the base. Annular protective plates are vertically and fixedly arranged between the circular mounting openings and the edge of the base. The two sides of the annular protective plates are connected with a horizontal U-shaped insertion rod in asleeved mode by through holes. The end, near the center of the base, of the horizontal U-shaped insertion rod, located at the inner side of the annular protective plates is fixedly provided with an arc-shaped plate. Springs are arranged on the outer portions of the upper and lower ends of the horizontal U-shaped insertion rod between the inner side of the annular protective plates and the middleof the outer side of the arc-shaped plate in a sleeved mode. Screws are installed at the middle of the horizontal U-shaped insertion rod and the middle of the outer side of the arc-shaped plate through bearings. According to the safety protection device for the wellhead of the pumping unit, the annular protective plates and protective cover are arranged to completely protect the wellhead, the structure is stable, the accident of falling into a well caused by the overturn of the protective cover is prevented, the safety is high, and the adjustable arc-shaped plate enlarges the application scopeof the device.

The invention discloses a novel rotary percussion drilling tool. The tool comprises an anti-dropping switching assembly, a motor assembly, a universal shaft assembly and a driving impact assembly. The interior of the anti-dropping switching assembly is provided with anti-dropping discs. An anti-dropping connecting rod is fixed by a spare fastening nut. An upper spherical joint and a lower spherical joint of the universal shaft assembly are connected to two ends of a spherically-hinged connecting rod through a movably articulated manner. Driving balls are utilized for transferring torque. The upper spherical joint is connected with a rotor of the motor assembly. The lower spherical joint is connected with a driving shaft of the driving impact assembly. One end of the driving shaft is connected with the lower spherical joint and the other end of the driving shaft is connected with a spline mandrel. The bottom of the spline mandrel stretches into a spline housing. The novel rotary percussion drilling tool has following beneficial effects: an impact generator is arranged in an open-type lubricating driving shaft assembly; the drilling tool is simple in structure; functions of rotary drilling and directional drilling for a bent housing of a common screw drill tool and a turbine drill can be fulfilled; and meanwhile, the function of an impact drill is also fulfilled so that drilling speed is effectively increased.

The invention belongs to the technical field of petroleum, and particularly relates to a catcher used in the well logging process. The catcher is used for preventing instruments from dropping into a well in the process of measuring high-low pressure of an oil and gas well site in the petroleum industry and in the operation process of lifting and dropping steel wires and cables. According to the technical scheme, the catcher used in the well logging process comprises a catcher outer cover which is cylindrical in shape. The inner diameter of the lower end of the catcher outer cover is smaller than the inner diameter of the upper end, an external thread which is arranged on the outer upper portion of the catcher outer cover is connected with a blowout prevention box, a thread on the inner upper portion of the catcher outer cover is connected with an adjusting elastic piece, a slip is arranged on the inner lower portion of the catcher outer cover, and a control spring is arranged between the slip and the adjusting elastic piece. According to the technical scheme, the catcher is simple in structure and small in size, the catcher is installed inside a blowout prevention pipe, a sealing device does not need to be additionally arranged, and the catcher has the catching function of preventing the instruments from accidentally dropping into the well.

The present invention discloses a fixing device for downhole rod and pipe, including first cylinder, second cylinder mounted in one end in the first cylinder and conical cylinder mounted in another end in the first cylinder. The described conical cylinder is made up by adopting the material whose hardness is less than at GFRP, and the internal surface of the conical hole of the first cylinder and the external surface of the conical cylinder are identical in taper, so that they are tightly contacted. Between the described second cylinder and the described conical cylinder a washer is set, and the first cylinder and second cylinder are screw-connected between them, on the radial position of the first cylinder the screw is set, and on the walls of first cylinder, second cylinder, conical cylinder and washer the opening mechanisms are respectively set.