33results about How to "Play the role of self-locking" patented technology

The invention provides a lifting stand column with a small installation distance. The lifting stand column comprises a driving device, a lifting pipe and a transmission assembly. The lifting pipe comprises a first pipe, a second pipe, a third pipe, a fourth pipe and a fifth pipe. The lower end of the fifth pipe is fixed to the driving device. The transmission assembly comprises a first screw rod,a second screw rod, a third screw rod and a fourth screw rod. The output end of the driving device is in transmission fit with the first screw rod and can drive the first screw rod to rotate. The lower end of the second screw rod is provided with a first nut in threaded transmission connection with the first screw rod. The lower end of the third screw rod is provided with a second nut in threadedtransmission connection with the second screw rod. The lower end of the fourth screw rod is provided with a third nut in threaded transmission connection with the third screw rod. The lower end of thefirst pipe is provided with a fourth nut in threaded transmission connection with the fourth screw rod. The adjacent screw rods are in threaded transmission connection, in addition, each nut is located between the corresponding two adjacent screw rods, the transmission assembly can be more compact in the axial direction and the radial direction, and the small installation distance and the large stroke of the lifting stand column are achieved.

The invention discloses an adjustable building crane, comprising a base. The left upper end of the base is provided with a cab; the right upper end of the base is provided with a rotating mechanism; the output end of the rotating mechanism is provided with a support column; the right upper end of the support column is provided with a suspender; a guide wheel is arranged at the tail end of the suspender; a lifting rope is arranged on the guide wheel in a winding manner; the left end of the lifting rope is fixedly connected with a hoist; a hook is arranged at the lower end of the lifting rope; and the tail end of the bending hook of the hook is connected with a self-locking rod by a reset hinge. The adjustable building crane has a simple and reasonable structure; when a heavy object is hungon the hook, a traction rope is subjected to a pressing force, and then the self-locking rod is driven to rotate towards the inner side of the hook so as to play the self-locking action; a camera is arranged on the suspender above the hook; the action of the camera is to observe the situation below the lifting, so that an operator can grasp the surrounding sight clearly and conveniently; the safety of the device is improved; the switching between the carrying mode and the fixing mode of the device is realized; and the practicability of the device is greatly improved.

The invention relates to a switch cabinet and a valve driving mechanism with a self-locking function thereof. The valve driving mechanism comprises a mounting frame and a connecting plate rotationallymounted on the mounting frame; the valve driving mechanism further comprises a spring bolt which is movably assembled on the mounting frame, wherein the guiding direction of the spring bolt is parallel to the rotating axis of the connecting plate. A lock hole structure is arranged on the connecting plate, and the spring bolt is provided with a locking position connected with the lock hole structure in an inserted mode and an unlocking position separated from the lock hole structure in the moving stroke of the spring bolt, wherein a reset spring is arranged between the spring bolt and the mounting frame, and the spring bolt is provided with a pushing part used for being pushed by a corresponding unlocking push rod to overcome an acting force of a reset spring to move towards the unlockingposition. During use, the unlocking push rod pushes the spring bolt, so that the spring bolt moves to the unlocking position along the guide direction of the mounting frame; at the moment, the springbolt unlocks the connecting plate, the connecting plate can rotate to drive a valve to be opened, the unlocking push rod to move reversely and the valve to be closed; meanwhile, the spring bolt is guided to move to the locking position under the action of the reset spring, the connecting plate is locked and cannot rotate at the moment, and the valve self-locking effect is achieved.

The invention relates to a molding sand for casting elevator traction wheels and a molding device thereof. The molding sand includes a three-layer structure, which is divided into a fine sand layer, a medium sand layer and a coarse sand layer. The fine sand layer is the innermost layer. The middle sand layer is the outer layer of the fine sand layer, the coarse sand layer is the outer layer of the middle sand layer, the fine sand layer is a sand layer made of sand with a fineness modulus less than 2.2, and the middle sand layer is composed of A sand layer composed of sand with a fineness modulus between 2.3 and 3.0, the coarse sand is a sand layer composed of sand with a fineness modulus between 3.1 and 3.7, and the thickness of the fine sand layer is 30 to 50mm between. On the premise of ensuring the surface quality of the casting, the molding sand greatly reduces the manufacturing cost of the molding sand, and at the same time, the stability of the molding sand after molding is improved, and it is not easy to be damaged and deformed.

The invention discloses a multiple anti-theft bluetooth office lock, which comprises a motor fixed on a table, a control circuit for driving the motor to run, and a drive block fixed on a drawer, the opposite sides of the drive block are respectively fixedly connected with connecting rods , one end of the connecting rod is fixed to the drive block, the other end is fixed to the inner wall of the drawer, a threaded hole is provided in the middle of the drive block, a screw is coaxially fixed on the rotating shaft of the motor, and the screw passes through the screw thread The hole is set to match the internal thread of the threaded hole, and the drawer is driven to move back and forth along the length direction of the screw rod when the motor rotates. The multiple anti-theft bluetooth office lock of the present invention can effectively lock and open the drawer through the setting of the control circuit, motor, drive block, screw rod and threaded hole, avoiding the problem that can be achieved by destroying the lock cylinder in the prior art. And the problem of prying open the drawer.

The invention relates to a near-ultraviolet source adjustment mechanism for a solar simulator, which includes an adapter ring, a body, a condenser lens, an adjustment cylinder, an inner focusing cylinder, an insulating sleeve and a lamp holder, and the adapter ring is sleeved on one side of the body. The condenser is fixedly connected to the adapter ring, the adjusting cylinder is connected to the other side of the body by rotation, the inner focusing cylinder is plugged into the body, the insulating sleeve is plugged into the focusing inner cylinder, and the lamp holder is plugged into the insulating sleeve, among which , there are four adjusting screws threaded on the insulating sleeve, the axis directions of the adjacent adjusting screws are vertical to each other and one end is in contact with the lamp holder, the other end of the adjusting screw passes through the focusing inner barrel and extends out of the body; the focusing inner There are several guide columns fixedly connected to the outer wall of the cylinder, and several guide grooves are opened on the adjustment cylinder. The guide columns pass through the body and extend into the guide grooves, so that the guide columns and the adjustment cylinder are slidably connected. The advantages of adjusting the position of the xenon lamp axis, horizontal direction, and vertical direction are unchanged.

The invention provides a downhole drilling tool and an anti-loosening self-locking structure thereof. The anti-loosening self-locking structure of the downhole drilling tool comprises a mandrel of a downhole drilling tool, the mandrel is connected with a casing of the downhole drilling tool in a pivotable manner via a bearing and a bearing seat, the bearing seat is connected with the casing via a first screw thread pair, the lower end of the mandrel is connected with the upper end of a driving shaft barrel of the downhole drilling tool via a second screw thread pair, and the lower end of the driving shaft barrel is connected with a drill via a third screw thread pair. During working, the threaded connections between the bearing seat and the casing, between the mandrel and the driving shaft barrel and between the driving shaft barrel and the drill become tighter and tighter by screwing along with rotation of the mandrel, so that self-locking function is realized, and loosening accidents can be effectively avoided. In addition, the downhole drilling tool and the anti-loosening self-locking structure thereof are simple in structure and low in cost.