34results about How to "Avoid broken belt accidents" patented technology

The invention discloses a pickling line tandem cold mill withdrawal and straightening machine control method. When the yielding strength of a target steel grade is smaller than or equal to 300 MPa, the ductility of a withdrawal and straightening machine is 2.3%-2.5%, and the engagement amount is 30 mm to 35 mm; when 300 MPa<the yielding strength<=450 MPa, the ductility is 1.8%-2.2%, and the engagement amount is 35 mm to 40 mm; when the yielding strength is larger than 450MPa, the ductility is set 0.5%-1.2%, and the engagement amount is 40 mm to 42 mm; and meanwhile according to the difference of the thickness or the width of front strip steel and rear strip steel, weld joint excessive withdrawal and straightening machine modes are divided into four kinds. By means of the pickling line tandem cold mill withdrawal and straightening machine control method, the withdrawal and straightening machine achieves automatic grouping control over steel grades in different yielding strength levels, normal withdrawal and straightening of the withdrawal and straightening machine can be guaranteed, the loads of the withdrawal and straightening machine can also be effectively reduced, normal pickling of the strip steel is guaranteed, and the withdrawal and straightening up-to-standard rate reaches 98% or above; and selection of the weld joint excessive withdrawal and straightening machine modes guarantees normal pickling of weld joint heads and tails, and the strip breakage accident caused by poor weld joint quality is avoided.

The invention discloses a method for acquiring process parameters of resistance seam welding and a welding method, and belongs to the field of welding. Among them, the method of obtaining the process parameters of resistance seam welding, the fastest welding speed is determined through the following steps: based on the finite element method, establish a temperature field / stress field calculation module for narrow lap resistance seam welding; Stress field calculation module, given welding current, electrode pressure and overlap amount, extract nugget size and plastic ring size; take nugget size and plastic ring size as constraints to solve the fastest welding speed. The invention obtains the nugget size and plastic ring size as constraint conditions through the narrow lap resistance seam welding temperature field / stress field calculation module, and can solve the fastest welding speed on the premise of ensuring welding quality and avoiding belt breakage accidents. The present invention does not need to pass multiple field tests, which is beneficial to saving time, manpower and material resources.

The invention provides a tension on-line detecting device which comprises a rack (1), cylinders (2), a connecting plate (3), pressure sensors (4), rollers (5), and a display screen (6). The upper right of the rack (1) is provided with the display screen (6) fixed through a base. The upper sides of the pressure sensors (4) are fixed to the lower side of the connecting plate (3), and the lower sides of the pressure sensors (4) are connected to the bases of the rollers. The tension on-line detecting device is characterized in that the lower side of the connecting plate (3) is provided with multiple groups of uniformly distributed pressure sensors (4) and rollers (5). According to the device, through the pressure sensors (4) arranged on the rollers (5), the tension of each section of a cold-rolled plate is detected, a worker can conveniently adjust the gap between rollers according to the tension of each section, and a belt breaking accident caused by uneven tension is avoided.

A strip steel buckles forecast method suitable for a continuous withdrawal unit, mainly comprises the following steps that are executed by a computer: 1 collecting a key apparatus of the continuous withdrawal unit and a technological parameter; 2 collecting the strip steel parameter; 3 defining related parameters; 4 calculating a strip steel critical instability stress Sigmah-cr(x); 5 calculating a Poisson stress Sigmav(x) that is born in strip steel local instability area, a thermal stress SigmaT(x), a frictional force Taud(x), and a centripetal force Tauz(x); 6 calculating a transversal crushing stress Sigmah(x) that is born in strip steel local instability area; 7 calculating strip steel buckles index distribution Lambada(x); 8 determining if Lambada(x) <Lamada *satisfies; and 9 outputting the forecast result. Buckles forecast in strip steel plate-connecting process is realized, thereby reducing accident rate and raising production efficiency.

The invention discloses a stereoscopic vision on-line detection method for a surface crack of a stretched aluminum alloy plate. According to the vision detection method, two CCD (Charge Coupled Device) cameras are fixedly connected with equipment so as to keep the constant parameters of the relative position of the CCD cameras; a matched calibrating program is used for automatically finishing a calibrating operation for the parameters of the two cameras; and a special precise mechanical system is used for controlling and outputting focal length parameters of the cameras, so as to realize the precise measurement for space coordinate information of a small object. Accordingly, a real-time measuring algorithm for an area stress and a crack length on the basis of displacement of a surface texture feature point (detecting point) is provided. The measured stress level and crack length information are combined with a crack growth theory, so that the crack threatening estimation and the action forecasting are realized, the optimal stretching technical parameter is confirmed, the belt breaking accident is avoided during a stretching process, the safety of equipment and production personnel is ensured, the yield of products is increased and the application prospect in the panel processing field is wide.