142results about How to "Automatic tension adjustment" patented technology

The invention relates to a control device for the automatic tension of a chain, which is suitable for a conveyer on an underground working surface of a coal mine, in particular to a control device for automatic tension degree of a chain, which is characterized by comprising a shift oil cylinder (2), wherein the piston rod of the shift oil cylinder (2) is connected with the shaft of a chain wheel for pushing the chain wheel to make linear translation; the shift oil cylinder (2) is also connected with a hydraulic control unit (4) through a hydraulic pipeline (6); the hydraulic control unit (4) is connected with a controller (5); a pressure sensor (1) and a displacement sensor (3) are also respectively installed beside the shift oil cylinder (2) for detecting the pressure borne by the shift oil cylinder (2) when pushing the chain wheel and the displacement of the shift oil cylinder (2); and the pressure sensor (1) and the displacement sensor (3) are respectively connected with the controller (5). The invention can automatically adjust the tension of the chain and enable the chain to keep in an ideal tension state all the time, thereby increasing the service life.

The invention provides a coiled material conveying tensioning device, which comprises a working platform support (1), and a first guide roller assembly (2), a second guide roller assembly (3), a tensioning guide roller assembly (4) and a tensioning guide roller support assembly (5), which are arranged on the working platform support, wherein the tensioning guide roller support assembly (5) is arranged between the first guide roller assembly and the second guide roller assembly, and the tensioning guide roller assembly is supported on the tensioning guide roller support assembly and below the first guide roller assembly and the second guide roller assembly; the tensioning guide roller support assembly can regulate the height of the tensioning guide roller assembly to allow a coiled material to be tensioned after the coiled material passes through a first guide roller, a tensioning guide roller and the second guide roller. The coiled material conveying tensioning device with a simple structure has the advantages of quick response and automatic regulation of the tension of the coiled material at a feeding end.

The invention discloses a linear cutting molybdenum wire tensile force automatic control system and tensile force control method. The linear cutting molybdenum wire tensile force automatic control system comprises a plurality of guide wheels, a driving device, a sensor and a control unit, wherein molybdenum wire are wound on the guide wheels; the driving device is used for driving one guide wheel to slide; and the control unit receives a sensor signal and allows the driving device to drive the guide wheels to slide. The tensile force control method comprises the following steps: presetting a standard value on a singlechip; allowing the senor to acquire the value of the ensile force of a molybdenum wire; allowing the singlechip to convert the value of the tensile force into a comparison value; summing the comparison value and a standard value to obtain a driving value; if the driving value is bigger than zero, allowing a step motor to rotate anticlockwise, and if the driving value is smaller than zero, allowing the step motor to rotate clockwise; and repeating the previous step till the driving value is zero. In the invention, the tensile force of the molybdenum wire can be regulated automatically, and the smooth finish of a machined part can be improved greatly.

The invention relates to the technical field of conveyors, and discloses a conveying device capable of automatically adjusting the belt tension according to the weight of materials. The conveying device comprises a rack, wherein a driving groove is formed in the top of the rack, a rack is fixedly connected to the inner bottom of the driving groove, a gear is engaged with the top of the rack, a rotating wheel is fixedly connected to the interior of the gear, a movable frame is fixedly connected to the top of the rotating wheel, a support rod is connected to the interior of the movable frame ina sliding mode, a band pulley is fixedly connected to the back surface of the support rod, a conveying belt sleeves the outer side of the band pulley, a catch pawl is connected to the interior of theconveying belt in the sliding mode, and tension springs are fixedly connected to both sides of the bottom of the catch pawl. According to the conveying device capable of automatically adjusting the belt tension according to the weight of the materials, a piston is pressed to move leftwards by the materials, an expansion ball is driven to expand by the piston, and the expansion ball is matched withthe catch pawl, so that the effect that heavy objects can be effectively conveyed and cannot fall off is achieved.

Provided is a self-fitting and automatically adjustable clasp band / strap which is usable in medical immobilization (e.g., casts, splints, braces) and multiple other fixation devices. The clasp band / strap may have a shape memory material and clasp members attached to two ends of the clasp band / strap. Upon stimulation by a trigger source, the shape memory material deforms which brings the two end portions closer to each other, causing the two clasp members to attach to each other to form a closure. Additionally, the clasp band / strap may include a motor, a control unit, and sensors to enable a motor actuated fine tensioning. Finally, the clasp band / strap may have an adhesive backing or any other kind of annealing or connective backing, such as a Velcro strap with an adhesive backing, for attaching to a splint or other object.

The invention discloses a large-roll cloth rolling and unrolling machine which comprises a rack, a matt surface roller, a mirror surface roller, a fabric drum, a guiding roller, a tightening roller, amovable roller and a traction roller, wherein the matt surface roller and the mirror surface roller are mounted on the rack in parallel side by side; the fabric drum is erected and mounted on the matt surface roller and the mirror surface roller; the fabric drum and the matt surface roller are in parallel; the two sides of the lower part of the fabric drum are in contact with the matt surface roller and the mirror surface roller; fabric is rolled on the fabric drum; from the end of the fabric drum, the fabric sequentially passes through the mirror surface roller, the guiding roller, the tightening roller, the movable roller and the traction roller; and fixing seats are arranged at the two ends of the fabric drum to position and fix the fabric drum. The large-roll cloth rolling and unrolling machine is reasonable in structure, simple to operate, convenient to use and driven through force of friction, can automatically adjust the tension, is high in rolling and unrolling quality and stability, can be adapted to rolling of fabric with different specifications, and is wide in range of application, and high in flexibility and using effect.

The invention relates to the technical field of bag making and packaging equipment, and discloses a vertical automatic bag making and packaging machine. The vertical automatic bag making and packaging machine comprises a mounting main frame, and a film guiding mechanism, a forming mechanism, a film pulling mechanism, a vertical sealing mechanism and a transverse sealing mechanism which are sequentially mounted on the mounting main frame, wherein the forming mechanism is mainly used for turning and coiling a packaging film, the film pulling mechanism is mainly used for providing power to pull the packaging film to move, the vertical sealing mechanism is mainly used for sealing side seams of the packaging film formed by coiling, and the transverse sealing mechanism is mainly used for transversely sealing a packaging film coiling block vertically sealed by the vertical sealing mechanism at intervals to form a packaging bag. The vertical automatic bag making and packaging machine is high in integration degree and small in occupied area, it is no need to arranged two drives, the cost is saved, the forming time is saved, the production efficiency is greatly improved, the tightness degree of the packaging film is guaranteed, therefore, the quality of the packaging film during forming is improved, the situation that the packaging film is damaged is avoided, and the production quality is high.