33results about How to "Avoid scratch damage" patented technology

This invention discloses a telescope lens processing device, specifically relating to the field of telescope manufacturing technology. It includes a processing table, with a processing component fixedly connected to its upper end and a transfer component fixedly connected to its upper part. A receiving tray is fixedly connected to the bottom of the processing table, and a control console is fixedly connected to the left side of the processing component. This telescope lens processing device achieves stable bearing and automated transfer of the lens through the cooperation of the processing table, processing component, and transfer component. The cooperation of the housing, grinding component, and unloading component ensures the stable installation of the processed parts. The combination of hydraulic rods, motors, and a coarse grinding head accommodates the grinding needs of lenses of different thicknesses. The replaceable coarse grinding head enhances the device's versatility. The receiving tray collects processing debris and finished lenses, avoiding environmental pollution, reducing manual labor intensity, improving processing accuracy and work efficiency, and ensuring the stability of the device's operation.

This application relates to an intelligent four-head electromagnetic clay pot cooker, belonging to the technical field of electromagnetic clay pot cookers. It includes a support plate, a support mechanism slidably connected to the top of the support plate, and a cleaning mechanism slidably connected to the top of the support plate. The cleaning mechanism includes a drive assembly for driving; a rotating rod is rotatably connected to the outside of the drive assembly; the drive assembly is fixedly connected to the outside of the support plate; a support column is fixedly connected to the outside of the rotating rod; a rotating rod is rotatably connected to the outside of the support column; and a connecting ring is rotatably connected to the outside of the rotating rod. This application has the advantages of improving the surface cleanliness of the support plate, having a stable and reliable mechanical transmission structure, automatically starting the cleaning program during idle periods without occupying cooking time, ensuring continuous and efficient operation of the equipment, avoiding scratch damage to the support plate surface by cleaning tools, and extending the service life of the equipment.

This utility model discloses a novel mine ventilation structure, belonging to the technical field of ventilation equipment. It includes a fan and a ventilation duct, with an installation mechanism between the fan and the ventilation duct for connecting the ventilation duct to the fan's outlet. The installation mechanism includes a detachable connecting cylinder attached to the fan's outlet. A partition is fixedly connected to the outer wall of the connecting cylinder. The ventilation duct's fabric is fitted onto the outer wall of the connecting cylinder, with one end covering the partition. Two clamps connected by bolts are installed on the outer side of the connecting cylinder. An elastic hook for hanging on a steel wire rope is installed on the ventilation duct. This utility model, through the installation mechanism, allows the ventilation duct's fabric to be fitted onto the outer wall of the connecting cylinder, with one end covering the partition. The two clamps are then installed on the outer side and secured with bolts, thus fixing the ventilation duct in place. The cooperation between the connecting cylinder and the clamps prevents the ventilation duct from falling off and prevents friction between the ventilation duct and the connecting cylinder during vibration, thereby preventing wear.

The invention belongs to the technical field of aerospace equipment assembly, and discloses a composite material wing box section intelligent flexible adjustable assembly tool which comprises a tool frame. The positioning assembly is installed in the tool frame and comprises a lower wall plate positioning device, an upper beam positioning device, a lower beam positioning device, a left end rib positioning device, a right end rib positioning device and an upper wall plate positioning device which are used for clamping a lower wall plate, an upper beam plate, a lower beam plate, a left end rib plate, a right end rib plate and a first upper wall plate of the wing box structure respectively; the mounting assembly comprises a six-degree-of-freedom mechanical arm and a storage rack, a mounting part is arranged at the tail end of the six-degree-of-freedom mechanical arm, a second upper wall plate is placed on the storage rack, and the six-degree-of-freedom mechanical arm is used for mounting the second upper wall plate on the wing box structure through the mounting part; and the adjusting part is used for leveling the tool frame. According to the method, the assembly precision, efficiency and universality can be greatly improved, the structural damage risk is reduced, and reliable technical support is provided for assembly of composite material complex components.

The invention relates to the technical field of magnetic core processing, in particular to a magnetic core and a processing technology thereof. The process comprises the following steps: step 1, preparing a magnetic core raw material; secondly, an insert is installed at the opening and closing position of the mold; 3, the magnetic core raw materials are added into a mold to be extruded and formed; 4, the insert and the magnetic core semi-finished product are sintered together, and a magnetic core product is obtained; according to the magnetic core obtained through the magnetic core machining technology, the hole is formed in the magnetic core, the insert is installed in the hole, and the part of the insert is connected with the mold; according to the invention, the insert is detachably mounted on the mold, so that the magnetic core product can be taken down from the mold together with the insert, and then subsequent sintering processing is carried out, so that the magnetic core with a groove structure is prevented from being scratched and damaged in the opening and closing process of the mold.

The application belongs to the technical field of bionic mechanical arm, and discloses a new energy vehicle air suspension package authorization, which comprises a buffer mechanism, the buffer mechanism comprises an upper arm, a sliding groove is formed in the inside of the upper arm, a first spring is fixedly connected to the inner wall of the sliding groove, a sealing ring is fixedly connected to the inside of the sliding groove, and a piston rod is slidably connected to the inside of the sliding groove; the cooperation of the piston rod and the first spring and other structures facilitates the buffering of the rotation of the lower arm, the inclined block slides in the inclined groove and exerts pressure on the piston rod in the process of rotation, the piston rod slides in the sliding groove towards the first spring, the first spring and the gas in the sliding groove are extruded, the rotation of the lower arm is buffered through the elastic force of the first spring and the gas pressure, mechanical energy is converted into gas pressure energy and elastic potential energy of the first spring, temporary energy storage is realized, the energy can be released in the subsequent reverse rotation of the lower arm, and energy loss is reduced.

The utility model relates to surface treatment technical field discloses the quick spraying positioning frame of stone surface antifouling nano coating, including work table, the top fixedly connected with fixed plate of work table, the top of fixed plate is provided with fixed mechanism, the fixed mechanism includes slide, the middle top fixedly connected with fixed column no.

The utility model provides a supporting and leveling mechanism and a supporting device, and belongs to the technical field of supporting devices. The problems that in the prior art, a rotating shaft is difficult to support and level, low in efficiency and prone to damage are solved. The supporting and leveling device comprises a V-shaped pad, the upper surface of the V-shaped pad is provided with a V-shaped groove, and slopes on the left side and the right side of the V-shaped groove are suitable for being in contact with a rotating shaft to be supported; the base is used for bearing the V-shaped pad, the base is connected to the lower surface of the V-shaped pad, and the bottom of the base is suitable for being connected with a jacking device; the dial indicator is used for detecting the jacking height difference of the left side and the right side of the rotating shaft and is connected to the base or the V-shaped pad; and the position adjusting piece is used for adjusting the horizontal position of the V-shaped pad and is connected between the base and the V-shaped pad. The leveling device has the advantages of efficiently leveling the rotating shaft and being convenient and fast to maintain.

The application provides a pipe belt conveyor, and relates to the technical field of pipe belt conveying, which comprises a tubular conveying belt, support frames uniformly distributed along a conveying direction, and a deviation rectifying roller set mechanism arranged thereon. The deviation rectifying roller set mechanism is composed of a fixing disc, a synchronous connection assembly, a deviation rectifying driving assembly, and a circumferentially distributed deviation rectifying roller assembly. The deviation rectifying roller assembly rolls and supports the tubular conveying belt in an arc surface. A deviation rectifying monitoring assembly is arranged between adjacent support frames, and is used for monitoring a surface marking line and a splicing joint of the tubular conveying belt. A control system judges deviation or torsion according to a monitoring signal, and controls the deviation rectifying driving assembly to drive the synchronous connection assembly to rotate, drives all the deviation rectifying rollers to synchronously deflect, applies a circumferential torsion force to the conveying belt, and realizes automatic correction of the deviation and the torsion. The application realizes real-time monitoring and automatic and accurate deviation rectification of a running state of the tubular conveying belt, effectively prevents damage of the belt body and material spilling, and significantly improves the reliability of equipment operation.

The utility model discloses a petroleum oil production water injection leakproof packer suitable for complex stratum, including packer body, the top of packer body is provided with the connecting pipe, the surface of connecting pipe is provided with the reinforcing sleeve, this petroleum oil production water injection leakproof packer suitable for complex stratum makes it pass through the thread hole of connecting plate and reinforcing sleeve in proper order through rotating screw rod, and finally is screwed into the lateral wall of drilling pipe column, thereby closely fixed connecting plate, reinforcing sleeve and drilling pipe column as a whole, and this structure is through mechanical linkage and multi -point locking mode, not only has strengthened the connection intensity between packer body and drilling pipe column, effectively prevented the loosening and falling apart of vibration during the process of going down the well, simultaneously formed the physical protection to the surface key part (such as rubber cylinder) of packer body with the help of the protection plate, avoided the scratch damage of well wall when lowering, significantly improved the installation reliability, structural stability and downhole operation safety of packer.

This invention relates to the field of oil and gas well fracturing technology, specifically disclosing a downhole bridge plug, including a central cylinder. A setting tool is provided on one side of the central cylinder, and a perforating gun is provided on one side of the setting tool. A movable cylinder is provided on the outer wall of the central cylinder, and a first anti-outburst ring is provided on the outer wall of the central cylinder. A first rubber sleeve is fixedly installed at the bottom of the first anti-outburst ring, and a first anti-outburst ring is also provided at the bottom of the first rubber sleeve. A second rubber sleeve is provided on the outer wall of the central cylinder, and a second anti-outburst ring is fixedly installed at both the top and bottom of the second rubber sleeve. This invention can effectively protect the bridge plug body through the protective components, avoiding damage to the bridge plug body caused by burrs protruding from the inner wall of the casing and casing deformation points during tool string advancement, which would lead to sealing failure. At the same time, during sealing, the cover plate is pressed against the inner wall of the casing for support, ensuring the stability of the operation, ensuring the sealing effect, and improving the overall fracturing operation efficiency.

The invention provides an intelligent high-temperature collecting, counting and stacking device for paper pulp environment-friendly tableware, which comprises an in-mold state monitoring unit for collecting temperature data and tableware state images in a shaping lower mold, and an adsorption transfer unit for adsorbing and transferring the tableware subjected to high-temperature shaping treatment in the shaping lower mold, the blowing demolding unit is used for assisting demolding when tableware subjected to high-temperature shaping treatment in the shaping lower mold is stuck to the mold, the transfer counting unit is used for collecting counting data in real time in the tableware transfer process, and the lifting limiting stacking unit is used for stacking and counting the tableware of different specifications. And the AI control unit is used for generating collecting, counting and stacking parameters matched with the current tableware to be transferred. Through the collaborative linkage design of all the units, the full-process intelligent high-temperature collecting, counting and stacking system is constructed, the problem that tableware is stuck to a mold after high-temperature setting is solved, and the labor cost and debugging errors caused by manual intervention are reduced.

The building construction level detection device with the safety protection function comprises a main ruler, the right end of the main ruler is connected with a balancing weight through a positioning piece, the side face of the balancing weight is connected with a buffering head, and the buffering head is provided with a cambered surface; a rope hole is formed in the surface of the main ruler, a safety rope is arranged in the rope hole, and the end of the safety rope is connected with a lock catch; the lower side surface of the main ruler is provided with a groove which is internally connected with a handle. The first protection strip and the second protection strip prevent the side face of the main ruler from being scratched and damaged, the main ruler is connected with the balancing weight through the stud, when the main ruler falls, the balancing weight falls fast, the buffering head falls to the ground preferentially, the buffering head replaces the main ruler to fall to the ground, the main ruler is prevented from being broken, the safety of the main ruler in the using process is improved, and the service life is long. The main ruler can be tied to a safe position through the lock catch and the safety rope, the main ruler can be prevented from falling off from the high altitude through the safety rope, and the safety accidents that people below are injured due to falling of the main ruler and the like are effectively avoided.

This utility model provides a hydraulic swing-arm type feeding pallet for a leveling machine used in the production of sound-absorbing sheet materials, including a main body, a support frame, an adjustment component, a support component, and a motor. This utility model avoids the safety hazards of manually prying heavy roll materials through a hydraulic swing-arm design. The anti-slip pad at the front end of the pallet adopts a flexible contact design to prevent scratching and damage to the damping rubber and sound insulation layer on the surface of the sound-absorbing sheet, solving the problem of sound-absorbing function failure caused by hard contact in traditional feeding methods. It prevents structural deformation: the reinforced structure of the support component distributes the load, and together with the flat surface of the pallet, prevents the sound-absorbing sheet from developing depressions and wrinkles due to uneven local stress. It is particularly suitable for the processing needs of thin metal substrates and flexible non-metallic substrates. The insertion and positioning of the adjustment groove and the pallet, and the multi-dimensional precise adjustment of the adjustment component, ensure that the sheet material is aligned with the feed inlet of the leveling machine during feeding, solving the problem of out-of-tolerance cutting dimensions caused by positioning misalignment in traditional feeding methods.

The utility model relates to the arrangement of the element specially applicable to vehicle and other categories not containing circuit or fluid pipeline, especially to an automobile pipeline road passes over edge structure, vehicle frame and vehicle. Automobile pipeline road passes over edge structure includes pipeline road and the through piece that pipeline road passes, has the edge on the through piece, is fixedly arranged with the pipeline road support plate that shields the edge on the through piece, the side panel of pipeline road support plate away from the side panel that is shielded the edge is equipped with the support surface for supporting pipeline road, one end of pipeline road support plate is the pipeline road lead -in end for the pipeline road lead -in support surface, the other end is the lead -out end for the pipeline road lead -out support surface, sets up the fixed part cooperation structure on pipeline road support plate for with pipeline road fixed part cooperation, and pipeline road fixed part is used for fixing the pipeline road that is supported on the support surface. The utility model has solved the inconvenient problem of installation of the existing pipeline road passes over edge structure because of the installation time is limited.

The utility model relates to a sealed container cleaning robot relates to oil tank cleaning technical field, including magnetic wall climbing robot, telescopic cylinder, mounting frame, cleaning device and cleaning device. Telescopic cylinder drives mounting frame to adjust the distance of cleaning device and oil tank inner wall accurately, and cleaning device adopts conical roller cooperation circulation cleaning belt, can adapt to oil tank straight cylinder section and top, bottom big curvature camber surface, eliminates cleaning blind area, driving roller and extruding roller synchronous extrusion realize cleaning belt online self -cleaning, and matched elastic toothed scraper improves oil dirt adsorption efficiency. Cleaning device integrates steam injection and negative pressure suction, forms grading cleaning system. Through installing camera on mounting frame, can reach the purpose of real -time visual detection. The utility model realizes oil tank full inner wall automatic blind -area -free continuous cleaning, avoids personnel to enter sealed dangerous environment, significantly improves cleaning efficiency, operation safety and equipment reliability.

This utility model relates to the field of furniture technology, specifically disclosing an inflatable, gap-filling bed frame, comprising: a bed frame surrounding an inner cavity for placing a mattress; and a gap-filling assembly installed on the cavity wall of the inner cavity. The gap-filling assembly has an inflated state where it expands to fill the gap between the mattress and the bed frame, and a deflated state where it contracts to expose the gap. The inflatable, gap-filling bed frame provided by this utility model avoids excessively large gaps between the mattress and the bed frame, thus preserving the aesthetics, and also protects the sides of the mattress from wear and tear.

The utility model relates to the technical field of intercooler cleaning, and discloses an intercooler inner wall cleaning device which comprises a fixing seat, the end face of the fixing seat is fixedly connected with a feeding pipe, a communication groove is formed in the center of the interior of the fixing seat, and sliding grooves communicated with the interior of the communication groove are formed in the fixing seat at equal intervals. The inner wall of the intercooler pipeline is cleaned through the high-pressure nozzles, and the nozzles rotationally spray cleaning liquid in the center of the pipeline, so that xylene liquid is uniformly covered, local excessive scouring damage can be avoided, the cleaning effect is guaranteed, the service life of the pipeline is prolonged, the heat exchange effect is recovered, and load reduction of the device is reduced; due to the fact that xylene has good solubility on the polymers, EVA products adhered to the inner wall of the intercooler, fine powder formed by self-polymerization of ethylene and vinyl acetate and other dirt can be effectively dissolved and removed, compared with traditional high-pressure water cleaning, the cleaning effect is better, and the heat exchange effect of the intercooler can be more thoroughly recovered.

The invention relates to the technical field of cross-linked polyethylene insulated cables, and provides a wear-resistant tensile cross-linked polyethylene insulated variable-frequency cable which comprises a conductor, a cross-linked polyethylene insulating layer, an inner sheath, an armor layer and an outer sheath, the cross-linked polyethylene insulating layer wraps the conductor, the outer sheath and the armor layer sequentially wrap the inner sheath, and the armor layer wraps the outer sheath. The cable further comprises a plurality of wear-resistant protection units and a tensile connection assembly, and the wear-resistant protection units are detachably arranged outside the outer sheath and used for providing impact-resistant and wear-resistant dual protection outside the cable. And the tensile connection assembly is used for connecting two adjacent wear-resistant protection units and cooperating with the wear-resistant protection units to perform tensile reinforcement on the exterior of the cable. According to the technical scheme, the cable is used for solving the problems that in the prior art, the wear-resistant and tensile performance of the cable mainly depends on an outer sheath, the cable is insufficient in coping with complex working conditions, and the replacement and maintenance cost is high.

A method for preventing photovoltaic module cables from sagging is disclosed. In existing technologies, photovoltaic module cables are mostly naturally hung or simply bound for fixation. This method affects the safety and lifespan of the photovoltaic system and may cause cable joints to loosen, leading to poor contact. This invention includes the following steps: Ground stakes are inserted into rectangular fixing plates around the bottom flange to firmly fix the device to the ground; during height adjustment, rotating the handle drives a single-headed worm gear to rotate, which meshes with a worm wheel, causing the B synchronous pulley welded to the worm wheel to rotate. This rotation is transmitted via a synchronous belt to the A synchronous pulley fixed to the main shaft, thereby driving the main shaft and secondary shaft to rotate; gears fixed on the two secondary shafts mesh with two support column racks, causing the support columns to rise and fall along the A slide rail, thus adjusting the height of the upper clamping device. This invention is used to prevent photovoltaic module cables from sagging.

The utility model discloses a vehicle-mounted support which comprises a base, a clamping seat and a clamping arm, the clamping seat is rotatably connected to the base through a damping pivot, and can rotate up and down relative to the base; the clamping arm is rotatably connected to the clamping seat and forms a clamping cavity with adjustable opening and closing degree, the rotary connection structure between the clamping arm and the clamping seat comprises an elastic member, and the elastic member always drives the clamping arm to rotate in the direction of reducing the opening and closing degree of the clamping cavity; the utility model utilizes the damping pivot between the clamping seat and the base to adjust the up and down rotation angle of the clamping seat relative to the base, and meets the different visual angle requirements of users. With the rotary connection between the clamping arm and the clamping seat, and through the elastic member always driving the clamping arm to rotate in the direction of reducing the opening and closing degree of the clamping cavity, stable clamping force is ensured for the mobile phone. The utility model can meet the requirements of mobile phone navigation visual angle adjustment, convenient operation and safe use during driving, and effectively improves the convenience and safety during driving.

The utility model discloses a paper-plastic composite film for luxury packaging. The paper-plastic composite film is sequentially provided with a scratch-resistant coating, a matte PLA layer, a bonding layer and a paper layer from outside to inside, the matt PLA layer is composed of a first PLA matt surface layer, a PLA matt core layer and a second PLA matt surface layer, and the first PLA matt surface layer and the second PLA matt surface layer are both double-sided matt two-way stretch polylactic acid films. According to the utility model, the surface scratch resistance is improved, the surface hardness is improved by the scratch-resistant coating, and the scratch-resistant coating is combined with the matte PLA layer to form a composite protection structure, so that the scratch damage in the transportation and use processes can be effectively prevented; the outer surface of the film can be subjected to surface treatment such as embossing, gold stamping or laser engraving. According to the composite film, the surface scratch resistance is improved, the visual effect is optimized, and the composite film is environmentally friendly, good in mechanical performance, suitable for various luxury packaging scenes and capable of meeting the high-end market requirement.

The utility model discloses a cold-chain logistics packing box sealing device which comprises a foam box, a net basket for preventing the foam box from being scratched is arranged outside the foam box, a fixing frame is fixed to the top of the net basket through screws, and a foam cover plate covers the top of the foam box. A sealing structure for pressing the foam cover plate is arranged at the top of the fixed frame; the net basket and the foam box are arranged to be of a mutual supporting structure, the net structure of the net basket effectively prevents the foam box from being scratched and damaged in the transportation process, meanwhile, the foam box provides internal support for the net basket, the net basket is prevented from being pressed and deformed, the foam box can be independently taken out of the net basket and is convenient to replace, and the foam box is convenient to use. The air bag and the top cover can be quickly disassembled and assembled through the magnetic attraction type detachable structure, and when the air bag is aged or damaged, the air bag can be replaced without a tool, and disassembly and replacement are quick.

The utility model relates to the field of cleaning robots, and discloses a cleaning base station and a cleaning system.The cleaning base station comprises a machine body, a dust bag assembly, a support assembly and a detection element, the dust bag assembly is detachably installed in the machine body, the support assembly is arranged in the machine body, and an avoiding groove is formed in the support assembly; the detection unit comprises a detection unit, a linkage piece and a roller, the two ends of the linkage piece are connected with the detection unit and the roller respectively, the detection unit is installed on the support assembly, and the roller is arranged at the receding groove; when the dust bag assembly is not inserted into the machine body, at least part of the rolling wheel is located on the side, away from the detection unit, of the receding groove, and when the dust bag assembly is inserted into the machine body, the dust bag assembly can push the rolling wheel to move in the direction of the receding groove on the side, away from the detection unit, of the receding groove so as to trigger the detection element and generate a dust bag in-place signal. In the embodiment of the utility model, the roller is in rolling contact with the dust bag bracket, so that the dust bag component and the detection element are prevented from being scratched and damaged due to rigid contact.

This invention relates to the field of water conservancy engineering technology, and in particular to a sewage filtration device for water conservancy projects. The device includes a filter tank with an inlet pipe connected to one side. A filter plate is installed inside the inlet pipe. A T-shaped cylinder is installed at the top of the filter tank. A water-guiding plate is installed on the inner wall of the filter tank. A cleaning mechanism is provided at the top of the filter plate. The cleaning mechanism includes a rotating shaft A that rotates inside the T-shaped cylinder. A fan blade is fitted onto the outer wall of the rotating shaft A. This invention uses a pusher plate that moves along the axis of a scraper, and a slider that slides along the bottom groove of the scraper to increase the angle between the two sets of pushers. The end of the pusher plate approaches the inner wall of the filter tank, creating a pushing force on the sediment and other impurities accumulated on the surface of the filter plate. This achieves active cleaning to avoid pore blockage, ensuring stable sewage filtration efficiency. It eliminates the need for manual intervention, reducing downtime for cleaning, lowering maintenance intensity, and improving the continuous operation capability of the device.

The invention relates to the technical field of air compressors, in particular to a flow measuring device integrated on an air inlet pipe of an air compressor, which comprises a breather pipe, a proximity sensor is arranged on the breather pipe, the measuring end of the proximity sensor extends into the breather pipe, and two mounting frames are symmetrically and fixedly mounted in the breather pipe. A rotating shaft is rotatably mounted on the mounting frame, a hub is arranged on the rotating shaft, a plurality of blades are fixedly mounted on the hub, and the proximity sensor is used for detecting the blades; a sliding groove is formed in the hub, a connecting key is fixedly installed on the rotating shaft, the connecting key is arranged in the sliding groove, a damping ring is fixedly installed on one installation frame and used for abutting against one end face of the hub, and a reset spring is fixedly installed on the other installation frame and used for abutting against one end face of the hub. The other end of the reset spring abuts against the hub. Under the condition of pulsating airflow of the reciprocating air compressor, the measuring precision of the mechanical flowmeter is improved.

The utility model discloses an aircraft cockpit maintenance working device, which belongs to the technical field of aviation equipment maintenance and comprises an obliquely upward step structure and a foldable roller mechanism mounted at the lower end of the step structure. The roller mechanism comprises an iron core polyurethane single wheel, a supporting plate, a single wheel connecting rod and a wheel shaft mechanism, the supporting plate is installed at the lower end of the step structure, a semicircular plate with a circle center hole is arranged on the lower portion of one side of the supporting plate, two eccentric shafts are installed on the wheel shaft mechanism, one eccentric shaft is installed on the supporting plate, and the other eccentric shaft is installed on the iron core polyurethane single wheel. When the iron core polyurethane single wheel is located on the side face of the supporting plate, the iron core polyurethane single wheel is in a folded state, the whole working device is supported on the ground, when the iron core polyurethane single wheel is located on the lower side of the supporting plate, the iron core polyurethane single wheel is in an extending state, and the whole working device can move. The device is simple and practical in structure, can be moved when being used, and can improve the maintenance efficiency of thermal guarantee maintenance of the aircraft cockpit.