48results about How to "Prevent top damage" patented technology

The invention discloses a method for retaining a gob-side tunnel, which overall arranges the retaining of the gob-side tunnel in a stope working face gateway tunneling period, and comprises the steps of: combining the stope working face gateway with the gob-side retained tunnel, namely the next section gateway, together to be served as one tunnel for tunneling; and constructing tunnel concrete pier columns between the stope working face gateway and the gob-side retained tunnel, wherein the tunnel concrete pier columns are served as support in the tunnel and also served as one part of the side support for the gob-side retained tunnel; namely comprising the steps of: widening the section of the tunnel by tunneling, reserving the tunnel section according to the shrinkage factor of the god-side retained tunnel suffering from two times of support pressure, and pouring the reinforcing steel bar concrete pier columns in middle of the transverse direction of the tunnel to match with a cable anchor for supporting. The tunnel concrete pier columns are arranged along the whole length of the tunnel at intervals, and used for dividing the tunnel into two parts. Insulating walls are constructed between two adjacent columns after the columns are constructed. When the stope is starting, the support is needed to be temporarily reinforced at two sides of the columns according to requirements along with the advancing of the stope working face. According to the method for retaining a gob-side tunnel, the retaining of the gob-side tunnel and the tunneling of the stope working face gateway are overall arranged, and the tunnel concrete pier column support is arranged; therefore, the side support intensity and support resistance of the retained tunnel are greatly enhanced, the influence of support pressure in two times of mining is effectively controlled. The method for retaining gob-side tunnel is particularly suitable for using in flexible mining faces of bottom plate and / or top plate.

The invention discloses an intelligent product taking machine which comprises a rack, an operating platform, a transmission mechanism and a pressure head mechanism, wherein the operating platform and the pressure head mechanism are arranged on the rack, the transmission mechanism is arranged on the operating platform, the pressure head mechanism is provided with a pressing frame and an ejector rod, the pressing frame can move up and down, the ejector rod is driven by an air cylinder with a pressure self inductor, the air cylinder is fixed on an upper pressing plate, the transmission mechanism comprises a transverse driving device and a longitudinal driving device, the transverse driving device is in sliding connection with the rack, the longitudinal driving device is in sliding connection with the transverse driving device, and the longitudinal driving device is provided with a fixed frame which is connected with a paper retaining frame. The intelligent product taking machine is characterized in that an ejector pin disc is arranged below the pressure head mechanism, the ejector pin disc can move up and down, a plurality of removable ejector pins are arranged on the ejector pin disc, and through holes which are used for the plurality of ejector pins to pass through are formed in the operating platform. The intelligent product taking machine is suitable for semi-finished products in various shapes and has the advantages of high product taking efficiency and strong versatility.

The invention relates to a double-layer metal pin assembly machine for plugs, comprising a frame, a conveying mechanism, a pin device, a welding device and a blanking device. Lifting cylinder and pin pick and place device. The pin pick and place device includes a pick and place body. The center of the lower part of the pick and place body is provided with an arc-shaped groove with an arc of 180 degrees. The lower part of the arc-shaped groove is equipped with an opening and closing device. There is a pressing slot on the main body of the device, the upper part of the pressing slot is provided with a pin pressing cylinder, the lower part of the pin pressing cylinder is connected to a pin pressing block, and the front side of the pick-and-placer is provided with a pin pushing installation block. The lower part of the pin push-in mounting block is provided with a pin push-in lift cylinder, and the pin push-in lift cylinder is connected with the pin push-in lift block. The present invention can not only realize the downward pressing of the pin, but also realize the metal pin The needle insertion operation is realized through the jack, which can meet the two-layer metal needle insertion of the double-layer and half-socket.

The invention provides a device capable of precisely placing thimbles and a method. The device is applied to a printing machine platform. A rail used for conveying a printed circuit board (PCB) is arranged above the printing machine platform. Due to the fact that a center positioning line on a film is aligned to a center line of a plate stopping position on the printing machine platform, and a bottom marking line on the film is aligned to one side edge of a pressing rod on the printing machine platform. Besides, due to arrangement that a flow direction index line on the film is in accordance with a flow direction indication on the printing machine platform, the film is rapidly and flatly placed on the printing machine platform, then the thimbles are arranged in a plurality of position marks on the film, and therefore fast and precise placement of the thimbles is realized. Besides, the phenomenon that the thimbles damage devices on the PCB is prevented from occurring.

The invention discloses a safety control device for anti-backward tilting of a crane jib, comprising a display, a controller, an angle sensor, a low-pressure alarm pressure switch, and a high-voltage alarm pressure switch; Compared with the setting value of the tilt limit position, a limit position limit signal is sent to stop the oil cylinder from retracting; the display is used to receive the anti-backward length signal sent by the controller, display it in real time on the display, and set it in the display Set a pre-alarm range for anti-backward limit, and when the anti-backward length reaches this range, an alarm window will pop up to remind the operator. The invention avoids the problem of inaccurate data display caused by signal interference; improves the generality and operation convenience of the detection of the limit position of anti-backward tilt; increases the pre-alarm function of the limit position of anti-backward tilt; improves the accuracy and accuracy of the entire anti-backward tilt safety control system. Reliability; reduce the cost of the anti-roll safety control system.

The invention discloses an automobile component punching forming die, and belongs to the technical field of automobile component punching. The automobile component punching forming die comprises a bottom plate, a first air pump, a male die, a top plate and a female die. The first air pump is connected to the top of the bottom plate, the female die is connected to the top plate, the end, away fromthe bottom plate, of the first air pump is connected with a sliding plate, the male die is connected to the outer wall of the sliding plate, ejector pins are connected to the inner wall of the femaledie, the tops of the ejector pins are connected with a pressing plate, the top of the pressing plate is connected with second air pumps, and the outer wall of each second air pump is connected with agas releasing valve and a one-way valve; and the ends, away from the female die, of the ejector pins penetrate through the second air pumps and are connected with pistons, and the ends, arranged in the female die, of the ejector pins are connected with ejector sheets. Through the arrangement of the second air pumps, it can be guaranteed that the stretching length of the ejector pins in the motionprocess is proper, and the situation that the ejector pins jack the dies to damage is avoided; and cost is reduced, manual drawing is avoided, the labor intensity is lowered, the work efficiency is improved, and repeated operation is convenient.

The invention relates to a plug metal assembly machine capable of integrally pulling and cutting a metal strip. The plug metal assembly machine comprises a rack, a transmission mechanism, a pin device, a welding device, a discharging device and a pulling and cutting device, wherein the pulling and cutting device comprises a pull groove seat and a metal roll rotation shaft, a metal roll is arrangedon the metal roll rotation shaft, the groove depth of the pull groove seat is half of the diameter of a metal needle, a cutter device comprises a pulling and cutting seat, a pull motor and a pull lead screw are arranged on the pulling and cutting seat, the pull lead screw is sleeved by a pull movable block, a cutting lifting air cylinder is arranged at a lower part of the pull movable block, a cutting lifting seat is connected with the cutting lifting air cylinder, a vertical cutter is connected with the cutting lifting seat, and an edge of the cutter is a semi-circular notch with the diameter larger than that of the metal needle. By special structure design on the cutter and the pull groove seat, the cutter can complete pulling of the metal strip, the metal strip also can be cut, the pulling and cutting structure is simplified, automatic pulling and cutting is achieved, and the processing efficiency is improved.

The invention discloses an automobile component punching forming die, and belongs to the technical field of automobile component punching. The automobile component punching forming die comprises a bottom plate, a first air pump, a male die, a top plate and a female die. The first air pump is connected to the top of the bottom plate, the female die is connected to the top plate, the end, away fromthe bottom plate, of the first air pump is connected with a sliding plate, the male die is connected to the outer wall of the sliding plate, ejector pins are connected to the inner wall of the femaledie, the tops of the ejector pins are connected with a pressing plate, the top of the pressing plate is connected with second air pumps, and the outer wall of each second air pump is connected with agas releasing valve and a one-way valve; and the ends, away from the female die, of the ejector pins penetrate through the second air pumps and are connected with pistons, and the ends, arranged in the female die, of the ejector pins are connected with ejector sheets. Through the arrangement of the second air pumps, it can be guaranteed that the stretching length of the ejector pins in the motionprocess is proper, and the situation that the ejector pins jack the dies to damage is avoided; and cost is reduced, manual drawing is avoided, the labor intensity is lowered, the work efficiency is improved, and repeated operation is convenient.

The invention discloses a device for adjusting a bearing gap. The device comprises an adapter sleeve, a locknut, a conical bore self-aligning bearing and a locking gasket. The device is characterized in that the periphery of the right side of the adapter sleeve is provided with a conical surface, the periphery of the conical surface is provided with the conical bore self-aligning bearing, and the left side of the conical bore self-aligning bearing is provided with the locking gasket; the locking gasket sleeves the adapter sleeve, the left side of the adapter sleeve is provided with the locknut, and the locknut is connected with the adapter sleeve. The device for adjusting the bearing gap has the beneficial effects of adjusting the bearing gap, preventing a bearing from being damaged duo to shaft swelling and facilitating dismantling.

The invention discloses a method for retaining a gob-side tunnel, which overall arranges the retaining of the gob-side tunnel in a stope working face gateway tunneling period, and comprises the steps of: combining the stope working face gateway with the gob-side retained tunnel, namely the next section gateway, together to be served as one tunnel for tunneling; and constructing tunnel concrete pier columns between the stope working face gateway and the gob-side retained tunnel, wherein the tunnel concrete pier columns are served as support in the tunnel and also served as one part of the side support for the gob-side retained tunnel; namely comprising the steps of: widening the section of the tunnel by tunneling, reserving the tunnel section according to the shrinkage factor of the god-side retained tunnel suffering from two times of support pressure, and pouring the reinforcing steel bar concrete pier columns in middle of the transverse direction of the tunnel to match with a cable anchor for supporting. The tunnel concrete pier columns are arranged along the whole length of the tunnel at intervals, and used for dividing the tunnel into two parts. Insulating walls are constructed between two adjacent columns after the columns are constructed. When the stope is starting, the support is needed to be temporarily reinforced at two sides of the columns according to requirements along with the advancing of the stope working face. According to the method for retaining a gob-side tunnel, the retaining of the gob-side tunnel and the tunneling of the stope working face gateway are overall arranged, and the tunnel concrete pier column support is arranged; therefore, the side support intensity and support resistance of the retained tunnel are greatly enhanced, the influence of support pressure in two times of mining is effectively controlled. The method for retaining gob-side tunnel is particularly suitable for using in flexible mining faces of bottom plate and / or top plate.

The invention discloses a straight walking type plate shearing machine, which belongs to the field of machining equipment. The straight walking type plate shearing machine comprises a shearing machine and a feeding device, wherein the feeding device is matched with the shearing machine, a straight walking mechanism is arranged at the bottom of the shearing machine, and the straight walking mechanism comprises a switch rail, a flat rail and a plurality of groups of roller assemblies; double inclined planes are formed on both sides of the upper part of the switch rail, the distance of the top ends of the double inclined planes is less than that of the bottom ends of the double inclined planes, and the center line of the flat rail is parallel to that of the switch rail; and the roller assemblies include concave rollers which are matched with the switch rail and flat rollers which are matched with the flat rail, and grooves which are matched with the upper part of the switch rail are formed in the surfaces of the concave rollers. The straight walking type plate shearing machine has the advantages of low cost and high practicability, the problem of incapability of straight walking of an existing walking type shearing machine is effectively solved, the structural design is optimized, the straight walking of the walking type shearing machine is realized by adopting a simple structure, and the plate shearing accuracy is guaranteed.

The invention discloses a lifting oil cylinder for agricultural machinery. The lifting oil cylinder for the agricultural machinery comprises a cylinder barrel, a cylinder cover, a piston and a piston rod; the external rod section of the piston rod is provided with a limiting stop clamp; a rod cavity oil port and a rodless cavity oil port are formed in the cylinder cover; the rodless cavity oil port communicates with a rodless cavity through a rodless cavity oil channel; a stop valve is arranged at the rodless cavity oil port; a connecting channel communicating with the rodless cavity oil port and the rodless cavity oil channel is further formed in the cylinder cover; and a check valve is arranged in the connecting channel. According to the lifting oil cylinder for the agricultural machinery, after a main engine of the lifting oil cylinder for the agricultural machinery is adopted for storing or transporting for a long time, when the lifting operation is started again, oil liquid of the rodless cavity oil port bypasses the stop valve, firstly the check valve is opened so that the oil liquid can enter the rodless cavity, when the oil liquid in the rodless cavity pushes the piston rod to be lifted to a certain position, the stop valve can be normally opened, the piston rod is continuously lifted, and therefore the phenomena that a valve rod abuts against and damages the limiting stop clamp or damages a sealing part, and the limiting stop clamp abuts against and damages the stop valve can be avoided, the failure rate of the oil cylinder can be reduced, and the service life of the oil cylinder can be prolonged.