369results about How to "Guaranteed support effect" patented technology

The invention relates to the field of coal mine underground roadway supporting processes, and discloses a roadway supporting process for regional high-stress discrete solidification. The method comprises the steps of geological exploration and stress testing, roadway support processing, support sorting, parameter determination and real-time monitoring and feedback, in the roadway support processing, a stress data processing module is constructed, stress data around a roadway are discretized into a plurality of area units, support sorting is conducted on the area units, and the roadway support processing module is constructed; and the high-stress area and the secondary high-stress area are sequentially subjected to supporting construction, parameters of anchor rods and anchor cables are determined before supporting construction, and the supporting effect is ensured. According to the roadway supporting method suitable for regional high-stress discrete solidification, the stability of the roadway is enhanced, the service life is prolonged, and the safety is improved by perfecting the supporting process.

The invention relates to a straight seam welding system for pipes, which is provided with a working platform and a rack fixed on the working platform, and is characterized in that the working platform is provided with a feeding station, a calibration station and a welding station, the feeding station is provided with a feeding mechanism capable of feeding, clamping and positioning the pipes, and an outer centering mechanism; the calibration station is provided with an inner centering mechanism, a hanging arm, a hook mechanism and a pipe pushing mechanism, wherein the hanging arm is fixed to the rack and can stretch into a pipe to support the pipe when the pipe is fed, the hook mechanism can be connected with the hanging arm in a matched mode, and the pipe pushing mechanism can push, press and position the pipe on the hanging arm. The piano key pressing plate mechanisms are oppositely arranged on the rack and can abut against the tops of the pipes, and a laser welding mechanism capable of welding weld joints on the pipes is arranged on the welding station; the invention further relates to a welding method, an electronic device and a storage medium. The pipe welding device is ingenious in structure, capable of achieving fast, efficient, stable and accurate welding of pipes, convenient and practical.

The invention relates to the technical field of power systems, in particular to a control method and device for a tracking-networking fusion phase angle of a converter, and the method comprises the steps: respectively obtaining initial phase angles of a tracking control link and a networking control link in the tracking-networking fusion converter; determining an initial fusion coefficient according to the SCR and the system inertia of the power system accessed by the tracking-networking fusion converter; adjusting the initial fusion coefficient by using the direct current side current and the grid side current to obtain a final fusion coefficient; and calculating a fusion phase angle of the tracking-networking fusion converter according to the final fusion coefficient, the initial tracking phase angle and the initial networking phase angle. Therefore, the problems that in the related technology, only the influence of SCR is considered, the influence of the inertia of the connected system and the power amplitude limiting of the converter itself is not considered, the fusion coefficient cannot be adaptively adjusted under multiple working condition power grids, consequently, the supporting capacity of the power grids and the stability of the converter are poor, solving is complex, the response time is long, and the stability of the converter is poor are solved. And actual conditions such as different faults and current limiting cannot be adapted.

The utility model relates to the technical field of industrial silicon production, in particular to a raw material screening device with a filtering structure, which comprises a rack, a servo motor is arranged on the surface of one side of the rack, a driving belt pulley is arranged at the output end of the servo motor, and a driven belt pulley is arranged on one side of the driving belt pulley. The driving belt wheel and the driven belt wheel are rotationally connected to the surface of one side of the rack through rotating shafts correspondingly. According to the improved raw material screening device with the filtering structure, the problem that impurities and dust in raw materials spread in the screening process is effectively avoided while feeding is facilitated through the structure of the screening barrel, and a rocker rotates along the surface circumference of a belt wheel to drive the screening barrel to push front and back; the supporting performance and stability of the screening barrel in the reciprocating motion are guaranteed through the corresponding structures among the tension spring, the movable support and the rack, the purpose of split-flow screening is achieved through the structure of the split-flow opening, the purpose of classified machining is achieved, and the overall production efficiency and the silicon iron quality are improved.

The invention discloses a method for designing a bionic bone scaffold based on wall thickness mixed gradient change, and belongs to the technical field of bionic bone scaffolds. By designing the wall thickness mixed gradient function, the lattice unit can have wall thickness gradient change in the radial direction and the axial direction at the same time, so that the porosity also has gradient change in three directions at the same time, and the defect that a bone scaffold is designed by using a lattice material (beam unit) unit and a TPMS unit in the prior art can be well overcome; and the stent better conforms to the natural bone structure and mechanical property requirements. The designed bionic bone scaffold is excellent in mechanical property, high in compression resistance and deformation resistance and capable of promoting cell growth and tissue regeneration.

The invention relates to a combined type lifting and defending system and a construction method thereof.The combined type lifting and defending system is provided with an underground anti-impact wall structure, an underground collapse preparing body is arranged on the front side of the underground anti-impact wall structure, a cantilever retaining wall is arranged above the underground anti-impact wall structure, the collapse preparing body is formed by regularly stacking a plurality of collapse preparing body single bodies, and the underground anti-impact wall structure is provided with a main wall body; the main wall bodies are underground diaphragm walls, the number of the main wall bodies is two, the two main wall bodies are parallel to each other, a plurality of tie walls are distributed between the two main wall bodies, and a unified crown beam is arranged on the top of the main wall bodies. The method comprises the following steps: firstly, constructing an underground anti-scour wall structure, after the underground anti-scour wall structure is poured, constructing a collapse preparation body and a cantilever retaining wall, excavating earthwork as required, arranging the collapse preparation body on the front side of the underground anti-scour wall structure, and arranging the cantilever retaining wall on the underground anti-scour wall structure. By constructing the combined dike system, the scour prevention effect can be effectively improved.

The utility model belongs to the technical field of flame-retardant power cables, and particularly relates to an aluminum core flame-retardant power cable, which comprises a plurality of aluminum cores and an inner support positioned in the center of the cable, the plurality of aluminum cores are uniformly distributed outside the inner support, an outer cover plate is arranged outside the aluminum cores and positioned outside the inner support, and the outer cover plate is provided with a plurality of aluminum cores. The outer cover plates are tightly attached to the aluminum core and the inner support at the same time, the multiple outer cover plates are circumferentially distributed, the outer cover plates are continuously arranged in the axial direction of the cable, and the outer cover plates are in butt joint with or disengaged from the inner support and the aluminum core in the radial direction; firstly, the inner support and the outer cover plate are arranged to wrap the aluminum core, stripping is easier compared with a filling layer, the split outer cover plate is arranged to be matched with the marking groove, rapid stripping of the outer cover plate is facilitated, and wire stripping work during wiring is facilitated while the structural stability is guaranteed; buffering and deformation spaces can be provided for the aluminum core, so that the bending resistance of the cable is better.

The invention relates to a cable structure optimization design method and device and computer equipment. The method comprises the following steps: acquiring cable structure data of a cable, and core structure information and physical performance information of each filling core, constructing a cable structure model of the cable based on the cable structure data to simulate a current transmission process so as to obtain simulation structure data of the cable, and constructing a cable structure model of the cable based on the simulation structure data of the cable, the position information of each hollow core of the cable is identified, so that the cable structure model is adjusted, a cable core structure model of each filling core is obtained, and target cable structure data of the cable is identified based on core structure simulation data of each cable core structure model and core structure experiment data of each cable core structure model. By adopting the method, the resource optimization effect of designing the cable conductor structure can be improved.

The utility model provides a motor bearing press-fitting device which comprises a supporting table, a guide column, a supporting plate, a press-fitting structure, a supporting frame, a press-fitting hydraulic structure and a bearing positioning structure, the guide column is fixedly installed on the surface of the supporting table, the supporting plate is fixedly installed on the top of the guide column, and the press-fitting structure is installed on the surface of the guide column in a sliding mode; the supporting frame is fixedly installed on the surface of the supporting table, and the press-fitting hydraulic structure is fixedly installed on the top of the supporting frame and fixedly connected with the press-fitting structure. The bearing positioning structure is fixedly mounted on the surface of the supporting table; due to the arrangement of the press-fitting structure and the bearing positioning structure, the problems that an existing bearing press-fitting structure is still incapable of accurately positioning, uneven in pressure distribution and relatively low in production efficiency are solved.

The invention provides a coal mining method. The coal mining method comprises the following steps: 1, analyzing the characteristics of a coal seam to be mined, determining the structural strength sigma e of paste, and designing the step pitch L of the filled paste and the height H of the filled paste; 2, pre-mining the coal seam to be mined to form a first area to be mined and a second area to be mined, and arranging a roadway to form an air inlet and return system; thirdly, a heading machine is arranged to conduct primary mining on the first to-be-mined area and the second to-be-mined area in sequence, anchor rod or anchor cable supporting is conducted on a top plate in the mining process, and mined goaf roadways are blocked; fourthly, the goaf roadway is filled with paste; and 5, repeating the step 3 to the step 4 until the mining of the coal seam to be mined is completed. The problem that in the prior art, when a deep coal mine is mined, a coal seam falls off easily, and the mining efficiency is reduced is solved.

The invention relates to an automatic cutting machine, and belongs to the technical field of garment cutting devices. The automatic cutting machine comprises a cutting machine frame, a cutting mechanism, a movable frame body and a movable driving part, the cutting machine frame is provided with a cutting working face for laying cloth, and the automatic cutting machine further comprises a lifting mechanism arranged at the bottom of the cutting working face and a translation mechanism for driving the lifting mechanism to translate; the lifting mechanism comprises a lifting rod and a lifting driving part for driving the lifting rod to ascend and descend, a plurality of lifting through holes allowing the lifting rod to penetrate through are formed in the cutting working face of the cutting machine frame in the width direction at intervals, and the cutting machine frame is provided with a sealing assembly used for covering the lifting through holes. And when the lifting rod is not arranged in the lifting through hole, the sealing assembly covers the lifting through hole. The device has the effect that an operator can conveniently take all the cloth pieces at a time.

The utility model relates to the technical field of reinforcing steel bar positioning, in particular to an adjustable reinforcing steel bar positioning device which comprises a reinforcing steel bar support, a movable block, a positioning device and a positioning device. The adjusting and positioning mechanism is arranged on the outer side of the movable block; comprising a plurality of connecting bases, an adjusting assembly and a moving assembly. The multiple connecting bases are arranged on the outer side of the movable block, and the adjusting assembly is arranged outside the movable block and connected with the movable block through the connecting bases; the moving assembly is arranged between the movable block and the steel bar support. The positioning range can be adjusted through the adjusting assembly when the reinforcing steel bar support is used, so that the positioning range of the reinforcing steel bar support can be dynamically adjusted according to the sizes of different reinforcing steel bar meshes to ensure accurate adaptation and stable supporting, and the moving assembly can adjust the distance between the movable block and the reinforcing steel bar support, so that the downward pressing force on the reinforcing steel bar meshes is synchronously adjusted; the problems that in the prior art, a reinforcing mesh cannot be effectively positioned, and the binding quality of the reinforcing mesh cannot be guaranteed are solved.

The utility model provides an arm fixing device for child infusion, and belongs to the technical field of medical equipment. Comprising a base and a movable seat, the base is used for being fixedly connected with a seat armrest, the movable seat is movably hinged to the base, and a first mounting groove matched with an arm and a second mounting groove used for containing a palm are formed in the top wall of the movable seat; a first positioning cover used for being matched with the first mounting groove is hinged to the position, located on one side of the first mounting groove, of the movable seat, and a second positioning cover used for being matched with the second mounting groove is hinged to the position, located on one side of the second mounting groove, of the movable seat. The first positioning cover and the second positioning cover are turned over to press and fix the arm of the child, when the child moves between the movable seat and the base, the angle of the arm can be flexibly adjusted, it is ensured that the arm and the movable seat are supported on the base, and the effect that the arm ache caused by the fact that the arm of the child is bound to the fixed position in the long-time infusion process is avoided is achieved.

The present invention discloses a geographic information surveying and mapping device and a surveying and mapping method thereof, and relates to the field of geographic information surveying and mapping technology. The geographic information surveying and mapping device and the surveying and mapping method thereof include a geographic surveying and mapping mechanism, and the geographic surveying and mapping mechanism includes a flatbed car, the top of the flatbed car is fixedly connected with the geographic information surveying and mapping device, the bottom of the flatbed car is fixedly connected with rollers, the outer wall of the flatbed car is fixedly connected with a placement and stabilization mechanism, and the outer wall of the roller is fixedly connected with an impurity cleaning mechanism. The geographic information surveying and mapping device and the surveying and mapping method thereof, by rotating the second bolt, the bottoms of the folding rods are interlaced with each other, and then the insertion thorns are inserted into the ground, which further ensures the fixation of the geographic information surveying and mapping device, and the interlacing of the folding rods is aimed at harder soil, and the folding rods can be stuck on the soil to provide a stable support for the flatbed car, and the movement of the folding rods will drive the movement of the extrusion plate.

The invention discloses a steel plate laser cutting supporting tooth assembly which comprises a base fixedly arranged; the workbench assembly comprises an installation support fixedly connected with the base, a rotation assembly rotationally connected with the installation support and a plurality of supporting rack units detachably and fixedly connected with the rotation assembly, and the supporting rack units are adjacently arranged in the rotation direction of the rotation assembly; the multiple supporting rack units are matched to be used for supporting a steel plate. The laser cutter is arranged above the base and used for cutting the steel plate on the supporting rack unit; and the driving assembly is connected with the base and used for driving the laser cutter to move above the steel plate. The steel plate laser cutting supporting tooth assembly is reasonable in design, and the molten supporting racks which cannot play a supporting role can be replaced conveniently.

The utility model relates to the field of brick making machines, in particular to a coal ash brick making machine which comprises a base. A sliding rod is arranged on the top of the base; a top plate is arranged on the tops of the sliding rods; a sliding plate in sliding connection is arranged on the side surface of the sliding rod; an extrusion structure for pressing and shaping is arranged on the top plate; a supporting bracket is arranged on the top of the base; a feeding structure for feeding is arranged on the supporting bracket; a supporting base is arranged on the base; according to the automatic discharging device, the automatic discharging effect of the automatic discharging device can be effectively improved through combination of the material pushing plate and the overturning plate, and compared with a traditional device, the automatic discharging device has the advantages that raw materials can be pushed out through the material pushing plate after extrusion forming through the rotating motor.

The utility model discloses a heat preservation roller shutter door guide rail cutting device which comprises two conveying belts, a cutting table is installed between the two conveying belts, a limiting column is installed at the top end of the cutting table, a cutting machine capable of moving up and down is installed on the outer wall of the limiting column, and a hydraulic cylinder is installed at the top end of the limiting column. The output end of the hydraulic cylinder is connected with the top end of the outer wall of the cutting machine, and two inner supporting parts used for supporting the guide rail in the cutting table are symmetrically arranged at the top end of the cutting table and located on the left side and the right side of the limiting column correspondingly. The inner supporting part comprises a support, and an inner supporting block matched with an inner cavity of the guide rail in shape is assembled on the inner side of the support. According to the heat preservation roller shutter door guide rail cutting device, in actual use, a guide rail can be internally supported, it is guaranteed that the two sides of a notch are supported, deformation of the notch is avoided, in addition, the device can be rapidly adjusted to meet the cutting requirements of guide rails of different models, the universality of the device is improved, and operation is easy and convenient.

The utility model belongs to the technical field of deep foundation pit supporting, and particularly relates to a deep foundation pit supporting structure which comprises a protective plate, two hinge arms are fixedly connected to one side of the protective plate, two fixing plates are arranged on one side of the protective plate, the hinge arms are hinged to the inner sides of the fixing plates, a connecting plate is fixedly connected between the two fixing plates, and the connecting plate is fixedly connected with the protective plate. A first threaded rod is in threaded connection with the middle of the connecting plate, a hinge seat is arranged on one side of the protective plate, one end of the first threaded rod is rotatably connected with the hinge seat, and a stretching assembly is slidably mounted in the protective plate; through cooperation of a hinge arm, a fixing plate, a telescopic assembly and other parts, when a constructor carries out installation and use, the device can be adaptively adjusted according to the actual depth of a foundation pit and the inclination angle of the side wall, the overall applicability of the device is improved, it can be guaranteed that a protection plate is always attached to the side wall of the foundation pit, and the construction efficiency is improved. And a soil layer on the side wall of the foundation pit is stably supported, so that the overall supporting effect of the device can be ensured.

The utility model discloses a splicing type pier anti-collision protection device which comprises a pier body and further comprises a protection device arranged on the outer side of the pier body. The enclosure devices are arranged on the two sides of the lower portion of the pier body; wherein the protection device can isolate and protect the outer wall of the pier body, the enclosure device can isolate soil near the pier body, the speed of water and soil loss can be reduced to the maximum extent, and the protection device comprises two first protection plates which are both installed on the outer wall of the pier body. The utility model relates to the technical field of piers, in particular to an anti-collision protection device for a spliced pier, which can improve the impact resistance of the pier body through the matching of the pier body and the protection device, can prevent the pier body from being damaged due to collision to the greatest extent, effectively ensures the weighing and supporting capabilities of the pier body, and is quick to install, convenient to construct and high in practicability. And the operation time is greatly shortened.

The utility model relates to the technical field of ultrasonic welding production mold devices of automobile lamp parts, in particular to a lower mold device of an ultrasonic welding mold, which is fixedly mounted on a mold base through a mold fixing block, a first accommodating groove is formed in one side, far away from the mold base, of the mold fixing block, and a mold movable block is mounted on the mold base in a sliding manner. A second containing groove is formed in the side, away from the mold base, of the mold movable block, a welding part is located in the first containing groove and the second containing groove, the driving assembly drives the mold movable block to move, and the driving assembly drives the mold movable block and the mold fixed block to be closed or separated, so that the welding part can be taken and placed; and meanwhile, through the action of the first containing groove and the second containing groove, the welding parts can be positioned and supported, and therefore it is guaranteed that the welding parts are conveniently taken and placed while being positioned and supported.

The utility model relates to tower crane technical field, especially safety protection type tower crane, including main body stand, be equipped with a plurality of support frame and with the installation block that is connected to it on main body stand, a plurality of protective net, protective net is connected with the installation block through second mounting bolt, a plurality of telescopic subassembly, telescopic subassembly both ends are connected with the installation block and support plate respectively through connecting component, and support plate bottom end is connected with fixed cone, a plurality of building link frame, and building link frame includes spiral groove disc and cross -bracing pull frame, spiral groove disc is connected support frame through carousel, and cross -bracing pull frame is connected spiral groove disc through plug connector, the utility model discloses through the setting of telescopic subassembly and installation block, can four -sided support to tower crane body, and the ability of anti -tilting is strengthened, through the setting of protective net, can undertake the component such as falling, effectively reduce the risk of high -altitude falling object to hurt the equipment and the personnel below, utilize the overall structure of building to share horizontal load, and the stability is strengthened.

The invention discloses a transformer coil drying pressing plate structure which comprises a mounting frame, a protection arm is fixedly connected to the outer surface of the mounting frame, a fixing rod is slidably connected to the side, away from the mounting frame, of the protection arm, and an outward extending plate is fixedly connected to the inner surface of the protection arm. The jacking assembly is slidably connected to the top of the mounting frame; the auxiliary assembly is fixedly connected to the bottom of the inner cavity of the mounting frame, and the top of the auxiliary assembly is fixedly connected with a bearing plate; and the bearing assembly is fixedly connected to the position, close to the auxiliary assembly, of the mounting frame. According to the transformer coil drying pressing plate structure, the bearing plate moves along with the mounting frame, meanwhile, a transformer coil is placed, the placing position of the transformer coil is adjusted according to needs, then the drying quality of the transformer coil is guaranteed, and the transformer coil can be extruded and fixed conveniently after the jacking assembly moves.

This application relates to the field of fixture technology, specifically to a pin insertion fixture. This application aims to solve the problem of low pin positioning accuracy. An embodiment of this application provides a pin insertion fixture, including a base, a first positioning plate, and a second positioning plate. The base is used to fix the device to be inserted (pin). The first positioning plate faces the base and has at least one first positioning hole configured to align with a pad on the device to be inserted. The second positioning plate is located on the side of the first positioning plate opposite to the base and has at least one second positioning hole. The first and second positioning holes are used to accommodate the same pin. The first positioning hole can perform a primary positioning of the pin, and the second positioning hole can perform a secondary positioning, achieving secondary positioning. The improved coaxiality and positional accuracy of the first and second positioning holes reduce the impact of errors between the first or second positioning hole and the pad on the pin, thereby improving the pin positioning accuracy.

This application relates to a continuous positive airway pressure (CPAP) device and a method for controlling ventilation pressure. The minimum operating pressure is determined by acquiring a preset treatment pressure and a target pressure drop. The device monitors the patient's respiratory phase transitions in real time and employs different pressure regulation strategies for the inspiratory and expiratory phases. During the inspiratory phase, the ventilation pressure is smoothly adjusted from the preset treatment pressure to the minimum operating pressure and maintained to reduce inspiratory effort. During the expiratory phase, the ventilation pressure is gradually increased from the minimum operating pressure to ensure that the ventilation pressure returns to the preset treatment pressure at the end of the expiratory phase, maintaining airway support and avoiding the risks of airway closure and central apnea. This application improves patient comfort during CPAP therapy, enhances treatment compliance, and simultaneously ensures airway support while reducing the risks of airway closure and central apnea.

The utility model provides a side wall inner plate structure and a vehicle. The side wall inner plate structure comprises a roof side rail inner plate, a B column inner plate and a top cover cross beam connecting plate. The top cover cross beam connecting plate is lapped on the inner side of the roof side rail inner plate and is used for connecting a top cover cross beam; the top of the B column inner plate is in lap joint with the outer side of the roof side rail inner plate, and the lap joint portions, on the roof side rail inner plate, of the B column inner plate and the top cover cross beam connecting plate are at least partially overlapped. According to the side wall inner plate structure, the lap joint part is arranged at the top of the B-column inner plate, and the lap joint part, the inner wall of the upper edge beam and at least part of the top cover cross beam connecting plate are connected in an overlapped mode, so that the connecting strength between the B-column inner plate and the upper edge beam inner plate and between the B-column inner plate and the top cover cross beam is improved, and the supporting performance and the force transmission performance of the top position of the side wall B-column inner plate are improved; therefore, the safety of the vehicle is improved.

The utility model relates to the technical field of house safety, and discloses a house building safety device which comprises a safety stand column used for supporting a poured concrete wall, a first inclined column is arranged on the safety stand column, a second inclined column is arranged in the middle of the first inclined column in an attached mode, and the second inclined column is connected with the safety stand column. An assembling plate is arranged on the first inclined column in an attached mode, and the assembling plate and the second inclined column are attached to each other. According to the housing construction safety device, the purpose of limiting and reinforcing the first batter post and the second batter post can be achieved through the splicing plate, so that the supporting effect of the connecting position of the first batter post and the second batter post can be effectively guaranteed, and the situation that the connecting position is bent during stress is avoided; and auxiliary fixing between the first inclined column and the second inclined column can be achieved through a connecting bolt, an adding plate and a threaded sleeve, the stability of the connecting position of the first inclined column and the second inclined column can be improved, the supporting effect on the wall is improved, and the safety of a house is improved.

The utility model discloses a deep soil sampling device for soil detection, which comprises a rotating shell and sliding support grooves arranged on the inner wall of the rotating shell, two sliding connection plates are slidably connected in the sliding support grooves at corresponding positions, the lower ends of the sliding connection plates are fixedly connected with rotating support plates, and the rotating support plates are fixedly connected with the rotating support plates. A rotating rod is rotatably arranged in the middle of the rotating supporting plate, a fixed connecting rod is fixedly connected to the outer side of the rotating rod, a rotating frame is rotatably connected to the fixed connecting rod, the connecting modes of the supporting disc and the clamping disc are consistent, and a soil detector is slidably connected to the interior of the rotating shell. A collecting box is slidably connected to the interior of the rotating shell, and the collecting box and the soil detector are not used at the same time; according to the soil sampling device, the stability of the internal space can be guaranteed when the rotating shell moves downwards, and the safety and stability of the device during rotation and sampling are improved when soil needs to be collected or detected.

The present invention relates to the technical field of steel strip production, and specifically discloses a copper-plated steel strip winding device, comprising a frame, on which a winding mechanism, a clamping mechanism and a supporting mechanism are arranged, the winding mechanism comprising a winding roller and a driving component, the clamping mechanism comprising two groups of clamping components, each group of clamping components comprising a clamping roller, and an elastic member is arranged between the clamping roller and the frame, so that the side wall of the clamping roller is kept in contact with the steel strip, the supporting mechanism comprising a supporting plate, a plurality of supporting blocks and a driving structure 2, each supporting block is in an arc shape, and slides with the supporting plate in the longitudinal direction, and a plurality of supporting blocks are distributed on the supporting plate in a spiral shape at intervals; during the winding process, the present invention can press the steel strip by the clamping roller, so that the wound steel strip is more compact and uniform, thereby improving the winding effect, and at the same time can support the steel strip by the successive upward movement of the plurality of supporting blocks, thereby preventing the wound steel strip from partially collapsing downward and affecting the winding effect.