1285 results about "Sliding contact" patented technology

The present invention mainly relates to the technical field of cable stripping. Disclosed are a cable stripping device and a stripping method. The cable stripping device comprises a sleeve and a first rotary disk, the first rotary disk being radially provided with several support rods, each support rod being rotatably connected to a roller in rolling contact with the side surface of a cable, and to a cutting blade used in cooperation with a cable sheath. The cable stripping device further comprises a second rotary disk, the second rotary disk being provided with arc-shaped grooves in sliding contact with the support rods. One end of the first rotary disk is provided with a center shaft rotatably connected to the sleeve, and protrusions are symmetrically provided at one end of the center shaft; a base is provided with an annular groove in a circumferential direction and a helical groove in communication with the annular groove; and the protrusions sequentially slide on the annular groove and the helical groove, thus respectively driving the cutting blades to move on the surface of the cable in a circumferential direction and helically in an axis direction. The beneficial effects of the present invention lie in: solving the problem of inconvenient stripping in existing stripping devices, and improving the cable stripping efficiency and effect.

The invention discloses a metro equipment mounting system, and relates to the technical field of metro equipment, the metro equipment mounting system comprises a collector shoe mounted on a metro vehicle chassis and a contact rail mounted beside a metro rail, a shoe body of the collector shoe is in sliding contact with the contact rail, and the collector shoe comprises a supporting seat and a swing arm arranged on the supporting seat; a spring mechanism is further arranged between the swing arm and the supporting seat, a shoe body is arranged at the end, away from the supporting seat, of the swing arm, the swing arm is connected with the shoe body through a base plate, and the base plate is arranged on the swing arm in a swing mode. In the jumping stroke of the shoe body, the base plate drives the shoe body to swing; the shoe body is arranged on the base plate capable of swinging, when the shoe body jumps, swinging of the base drives the shoe body to swing together, the inclination angle is gradually increased, and in the process that the shoe body is away from the contact rail, one side of the shoe body can basically keep in the state of making contact with the contact rail in the direction perpendicular to the advancing direction of a subway.

A hub is provided for a human-powered vehicle. The hub includes a hub axle, a first rotating body, a second rotating body, a first ratchet member, a second ratchet member and a slider. The first rotating body and the second rotating body are rotatably mounted on the hub axle. The first ratchet member rotates with the first rotating body. The second ratchet member rotates with the second rotating body. The slider rotates with the first rotating body and slide with respect to the second rotating body in a circumferential direction. The slider has a first contact surface in sliding contact with an axially facing surface of the second ratchet member. The slider has a second contact surface in sliding contact with a radially facing surface of the second ratchet member.

The invention belongs to the technical field of natural gas pipelines, and particularly relates to a self-compensation device for a metal sealing ring of a high-pressure natural gas pipeline. An outer connecting sleeve is fixedly connected to the exterior of a first pipeline, and a wear-resistant mechanism is mounted between a first inner connecting sleeve and a second inner connecting sleeve; the space between the first sealing ring and the packing sealing plate and the space between the second sealing ring and the packing sealing plate are filled with rigid packing, and the space between the first sealing ring and the second sealing ring is filled with flexible packing; a first toothed plate is fixedly connected to the exterior of the inserting plate, a sliding rod is slidably connected to the inner side of the translation groove, a clamping mechanism is installed at one end of the sliding rod, and a positioning mechanism is installed at the other end of the sliding rod; according to the device, rolling friction of balls is adopted to replace sliding contact, high-pressure vibration abrasion is greatly reduced, rigid-flexible double-filler combination elastically responds to deformation, continuous pressing of a sealing face is maintained, internal pressure impact is resisted through the right-angle toothed plate meshing self-locking design, and zero-leakage stable connection under the extreme working condition is achieved in combination with three-stage insertion rod positioning and bolt fastening.

A slip ring arrangement according to the invention for an electric machine comprises a first slip ring having a radial inner surface and a radial outer surface, a first contact pin forming an electrically conductive sliding contact with the first slip ring, a first conductor extending axially from the first slip ring and electrically connected to the first slip ring, and a substantially hollow cylindrical first support element having a radial inner surface and a radial outer surface. The first slip ring is arranged with its radial outer surface against the radial inner surface of the first support element. The first conductor is enclosed between the radial inner surface and the radial outer surface of the first support element.The first contact pin is guided radially displaceably within a second support element and is subjected to, or can be subjected to, force in a first radial direction. The second support element is arranged in a volume defined radially by the radial inner surface of the first slip ring, and the second support element is rotatably arranged relative to the first support element. Furthermore, the first contact pin can be subjected to force by a fluid on the side radially opposite the sliding contact. The invention further comprises a rotor of a separately excited synchronous machine.

The invention belongs to the technical field of valve executing parts, and discloses an executing mechanism driven by shape memory alloy, which comprises a supporting disc and a guide cylinder, a first binding post, a second binding post and a plurality of groups of positioning columns are arranged on the top surface of the supporting disc, the plurality of groups of positioning columns are spirally distributed, and a memory alloy wire is arranged on the top surface of the supporting disc. One end of a memory alloy wire is connected with the second binding post, the memory alloy wire is in sliding contact with the surface of the positioning column, and finally the memory alloy wire is in contact with the surface of the first binding post and then penetrates through a through hole in the center of the supporting disc to penetrate into a guide cylinder, and a connecting cylinder at the top end of the guide cylinder penetrates into the through hole in the center of the supporting disc; a positioning spring and a sliding block are arranged in the guide cylinder in a penetrating mode, the sliding block is connected with the tail end of the memory alloy wire, and a mandrel is arranged at the bottom end of the sliding block. The memory alloy wire is arranged in a spiral mode and occupies a smaller space, when the memory alloy wire is heated and integrally contracts, the memory alloy wire pulls the sliding block to move, longer linear displacement is achieved, and the executing mechanism is more compact in structure.

An improved perforating gun with novel endplates is disclosed along with a corresponding method of assembly. The endplate may include a base with first end separated from a second end separated by a curved sidewall centered around a longitudinal axis and a set of tube tabs flexibly coupled to the base and extending from the second end. The endplate may include a carrier tab with an integrated alignment pin. Selected embodiments may also include a zero-tension connector with a sliding contact mounted within a cavity of a housing, a through-wire connected to the sliding contact. The novel endplate reduces the cost and complexity of manufacture and installation.

A discharge device for discharging electric currents from a rotor part of a machine, said rotor part having a shaft, the discharge device comprising an axially displaceable contact element, which is at least partly accommodated in a guide, for forming an electroconductive sliding contact between a sliding contact surface of the contact element and a shaft contact surface of the shaft, the sliding contact surface being provided for forming the sliding contact, the contact element being electroconductively connected to the guide and / or a retaining element of the machine, and the contact element being prestressed towards the shaft contact surface by means of a spring element, the contact element being at least partly wetted with an oily fluid, in particular at least in the area of its sliding contact surface.

The utility model relates to the technical field of food safety detection, in particular to safety detection equipment for microorganisms in beef, which comprises an operation table, a placement table fixedly mounted on the operation table, a support arm fixedly mounted on the operation table, and a detection instrument fixedly mounted on the support arm. A U-shaped moving frame is slidably installed on the operating table through a sliding assembly, a cylindrical pipe is fixedly installed on the side face of the moving frame, the two ends of the cylindrical pipe are sealed, a plurality of liquid outlet pipes are fixedly connected to the cylindrical pipe, and a liquid inlet pipe is fixedly connected to the cylindrical pipe. A strip-shaped rod is mounted on the side, away from the cylindrical pipe, of the moving frame through a mounting assembly, a rubber scraping strip is fixedly mounted on the lower surface of the strip-shaped rod, and the lower side of the rubber scraping strip is in sliding contact with the containing table. The surface of the placing table is disinfected, so that residual microorganisms on the placing table are prevented from influencing the detection of the next beef, and the accuracy of a detection result is ensured.

A discharge device for discharging electric currents from a rotor part of a machine having a shaft. The discharge device having an axially displaceable contact element received at least partially in a guide unit and serving to form an electrically conductive sliding contact between a sliding contact surface of the contact element and a shaft contact surface of the shaft, the contact element being connected to the guide unit and / or a retaining element of the machine in an electrically conductive manner and being pre-loaded towards the shaft contact surface by a spring element, the contact element being wetted at least partially by an oily fluid, at least one duct being provided at least in sections of the guide unit and / or of the contact element for the oily fluid, the duct being formed by the guide unit and the contact element.

The utility model relates to the technical field of magnetic suspension conveying systems, in particular to sliding contact type power supply magnetic suspension equipment. Comprising a steel frame base, a bottom plate is arranged on the steel frame base, and a sliding contact module and a mover module are arranged on the bottom plate; the sliding contact module comprises a sliding contact line, a power connector is arranged on the sliding contact line, the sliding contact line forms a loop line through a connector and is arranged on a plurality of fixing seats, and the current collector is in sliding connection along the sliding contact line; the current collector and the mover module are rotationally connected through a hinge structure, the mover module slides along the guide rail, the guide rail is annular, and the current collector moves along the sliding contact line along with the mover module; one end, connected with the mover module, of the hinge structure is a z-shaped plate, one end, connected with the current collector, of the hinge structure is a connecting piece, and the connecting piece is hinged to the z-shaped plate through a hinge plate. According to the utility model, the problem of wiring winding in the motion process of a power supply loop line track when the mover moves is solved through a power supply mode of the sliding contact module; and the application of the equipment in different scenes is expanded.

The application relates to the brake pad manufacturing field and particularly relates to a brake pad cleaning equipment, which comprises a frame body, ultrasonic oscillators are installed on the frame body, a cleaning cavity is arranged in the frame body, a fixed connecting plate is fixedly installed in the frame body, a guide rod is fixedly installed on the fixed connecting plate, a lifting plate is slidably arranged on the guide rod, a brake pad is placed on the lifting plate, a guide column is fixedly installed on the fixed connecting plate, an arc-shaped guide groove is arranged in the guide column, a connecting piece is slidably installed on the guide column, the connecting piece is connected with the lifting plate, a connecting protrusion is integrally connected on the connecting piece, and the connecting protrusion is in sliding contact with the arc-shaped guide groove. In the application, when the lifting plate moves downwards along the guide rod, the lifting plate rotates, the brake pad is driven to move upwards and downwards, the brake pad is rotated, and the cleaning effect is good.

The utility model belongs to the technical field of steel bar bending, and particularly relates to a steel bar bending device for constructional engineering, which comprises four supporting rods, a workbench is fixedly mounted on the upper portions of the four supporting rods, a supporting plate is fixedly mounted on the upper portion of the workbench, and a placing groove is formed in the upper surface of the supporting plate. A steel bar body is in sliding contact with the arc surface of the containing groove, an angle-adjustable bending mechanism is arranged on the upper portion of the workbench, and a steel bar bending distance adjusting mechanism is arranged on the upper portion of the workbench. According to the reinforcing steel bar bending device for constructional engineering, the angle-adjustable bending mechanism is arranged to bend a reinforcing steel bar body at different angles, so that a worker can conveniently bend the reinforcing steel bar at different bending angles, and the reinforcing steel bar bodies with different sizes can be bent; and a steel bar bending distance adjusting mechanism is arranged, so that the bending distance of the steel bar is conveniently adjusted, and the technical problem that the requirement for large-angle bending of the steel bar cannot be met in the prior art is solved.

A piston of an actuator mechanism, the piston including a worm gear mechanism nut, the nut including an outer peripheral wall and a nut thread for cooperating, directly or via balls, with a worm gear mechanism screw; a bushing integral with the nut and at least partially covering the outer peripheral wall of the nut, the bushing comprising a cylindrical guide zone intended to come into close sliding contact with an inner guide wall of a guide cylinder of the actuator mechanism. The nut comprises at least one annular shrink-fit bearing surface, the bushing includes at least one shrink-fit zone shrink-fitted onto the annular shrink-fit bearing surface. The guide zone has a larger outer diameter than the shrink-fit zone and overlaps a covered portion of the outer peripheral wall of the nut without contact or shrink-fitting.

The invention relates to the field of pipeline welding, and provides a gas pipeline construction welding butt joint device which comprises a multi-degree-of-freedom supporting module, a base shell, a rotating module, a clamping shell, an adjusting module, a multi-degree-of-freedom welding module and an integrated driving module, an opening is formed in one side of the base shell, and the rotating module comprises a driving part, an arc-shaped pipe shell and a positioning hole. The integrated driving module is used for controlling the clamping shell to do radial movement, the surface of the pin rod is sleeved with a second spring, the second spring is used for controlling the pin rod to be separated from the cleaning part, the adjusting module can move along the axis of the arc-shaped pipe shell and comprises a limiting pin and a second pressure applying piece, and the limiting pin is located in the positioning hole and can enter the limiting hole. The second pressure applying piece controls the pin rod to make sliding contact with the cleaning part, then the cleaning part is controlled to stretch out of the hidden opening, the integrated operation function of clamping alignment, rotary translation cleaning and rotary welding is achieved, and the beneficial effects of being ingenious in structural matching, small in size, high in integration degree and high in precision are achieved.

There is provided a locking device for an opening and closing body, including: a locking portion; a base; a rotation body that includes a protruding portion on a part of an outer periphery thereof; a locking member; and an elastic member that includes a base portion, and a stopper portion configured to restrict a maximum rotation position of the rotation body in a predetermined direction by abutting against the protruding portion of the rotation body. The stopper portion is disposed in a manner of being biased in a direction opposite to the predetermined direction relative to the base portion. A part of the outer periphery of the rotation body is provided with a sliding contact portion that is configured to come into sliding contact with the elastic member in a process in which the protruding portion approaches the stopper portion.

The utility model belongs to the technical field of seamless steel pipe production, and particularly relates to a clamping component for large-diameter seamless steel pipe production, which comprises a fixed box and a moving assembly arranged on the side wall of the fixed box. The top of the outer side wall of the fixed box is fixedly connected with a fixed frame; the inner side wall of the fixing frame is slidably connected with a sliding block. A first servo motor is fixedly connected to the inner side wall of the sliding block. A supporting block is fixedly connected to the bottom of the inner side wall of the fixed box; the output end of the first servo motor is fixedly connected with a two-way screw rod; the two-way screw is in contact with the fixed box; the outer side wall of the two-way screw rod is in threaded connection with a pair of supporting columns; clamping plates are in sliding contact with the inner side walls of the supporting columns; the inner side wall of the fixed box is slidably connected with a first connecting block; and through the arrangement of the two-way screw rod and the supporting column, the steel pipe can be synchronously fixed at the two ends of the equipment, the position of the center of the steel pipe is not changed when the steel pipe is fixed, and the probability that the position of the center of the steel pipe is changed in the fixing process is reduced.

A slip ring arrangement according to the invention for an electric machine comprises a first slip ring, a first contact pin which forms an electrically conductive sliding contact with the first slip ring, and a first conductor extending axially from the first slip ring and electrically connected to the first slip ring. The slip ring arrangement further comprises a substantially hollow cylindrical first support element which has a first axial inner surface at a first axial end, forming a first rib extending radially inwards, wherein the first slip ring is arranged on the first axial inner surface. The first conductor is enclosed between a radial inner surface and a radial outer surface of the first support element. The first contact pin is guided axially displaceably within a second support element and can be subjected to force or is subjected to force in a first axial direction.The second support element is arranged within a volume defined radially by the radial inner surface of the first support element. The second support element is rotatably arranged relative to the first support element. The invention further comprises a rotor of a separately excited synchronous machine.

The present invention relates to a method for operating a current collector (10, 33), in which a positioning device (13, 56) moves a contact strip (14, 17, 27) relative to a contact wire and presses the contact strip against the contact wire using a pressing force to reach a sliding contact position, and a drive element (73) and / or a spring element (74) of the positioning device generate the pressing force on the contact strip. The current collector has a power supply unit (50) and a measurement unit (36, 43, 53, 58) having a measuring device (38, 44, 59), and at least two sensors (47, 48) of a sensor element (46) are provided, the power supply unit (50) generates at least the electrical energy required to power the sensor elements, each of the sensors outputs a measurement value, and a processing element (37, 49) processes the measurement value and correlates the measurement value with each other to determine a characteristic value representative of the operating state of the current collector and / or the contact wire. The present invention also relates to a current collector and a monitoring system.

The application provides a sliding contact line detection method and device, a controller, a medium and a product, and is applied to the technical field of defect detection. The method comprises the following steps: acquiring the current temperature of a carbon brush; performing two-dimensional code shooting on the position of the sliding contact line where the carbon brush is currently located to obtain current position information of the carbon brush, wherein the sliding contact line is provided with a plurality of two-dimensional codes, and each two-dimensional code corresponds to one position information; determining a temperature threshold value according to the current position information, wherein different position information corresponds to different temperature threshold values; and analyzing the current temperature and the temperature threshold value to determine the current state of the sliding contact line. According to the application, the temperature threshold value can be determined according to the current position information obtained by the two-dimensional code, and the current state of the sliding contact line can be determined according to the current temperature of the carbon brush and the temperature threshold value, so that the detection of the sliding contact line is realized.

The utility model relates to the technical field of PVC (polyvinyl chloride) film production, and discloses a PVC film calendering device, which comprises a machine body comprising a pair of support plates which are oppositely distributed along the horizontal direction; the pair of calendering rollers is rotationally connected between the pair of supporting plates; the driving assembly comprises two sliding block sets arranged on the supporting plate in the vertical direction, the two sliding block sets are connected with a pair of calendering rollers respectively, the calendering rollers and the sliding block sets are rotatably fixed, a first driving assembly is arranged on the supporting plate, and the driving end of the first driving assembly is connected with the two sliding block sets through a transmission unit. The two sliding block groups are configured to be close to or far away from each other; the cleaning sponge is arranged on one side of the pair of calendering rollers and is in sliding contact with the adjacent calendering rollers, a second driving assembly is arranged on the supporting plate, and the driving end of the second driving assembly is connected with the cleaning sponge so that the cleaning sponge can ascend and descend in the vertical direction. The application range of the calendering device can be widened, and the production requirements for PVC films with different thicknesses are met.

The utility model discloses a kind of over cross transport vehicles, including first rail, second rail and car body;Two first rails are provided, and two first rails are arranged in parallel and interval distribution;Three second rails are provided, and three second rails are arranged in parallel between two first rails;Three second rails are respectively and one-to-one correspondingly electrically connected with the three output electrodes of direct current three-phase power supply;Car body has electric drive part and three sliding contacts, each side of car body has at least two track wheels placed on first rail, electric drive part is drivingly connected with at least one track wheel, three sliding contacts are arranged on car body and interval distribution along left-right direction, and three sliding contacts are electrically connected with the three input electrodes of electric drive part, three sliding contacts and three second rails are one-to-one corresponding, and each sliding contact and corresponding second rail sliding contact.This makes three second rails as power supply line to power supply electric drive part on car body, so that cable is not needed to be set to carry out power supply.

One aspect of the invention relates to a test specimen (100) for characterizing vibration damping in adhesive or sliding contact between two components subjected to vibration, low-cycle, and tribological stress, wherein the specimen is provided with male and female fasteners (130) comprising a protrusion (131) extending from a free end of a first longitudinal rod and a recess (132) recessed at a free end of a second longitudinal rod. A second aspect of the invention relates to an apparatus (300) for characterizing vibration damping in adhesive or sliding contact between two components subjected to vibration, low-cycle, and tribological stress, wherein the apparatus is provided with a test bench (300) on which the test specimen (100) is mounted, and wherein the apparatus includes a vibrator (310) for transmitting vibrational excitation to the test specimen (100) and a static loading device (320) for transmitting low-cycle stress to the test specimen. A third aspect of the invention relates to a method (400) for implementing the characterization apparatus (300).

The disclosure relates to a device for transmitting electrical current to a rotor of an electric machine, having a group of sliding contacts each assigned to an electrical pole for transmitting current to a slip ring of the electric machine assigned to each such group. At least one separator is provided for separating electrically conductive particles from the coolant of a coolant system for cooling the sliding contacts.

The utility model discloses a kind of weighing elastomer pressure test equipment, including stand, clamping and pressing assembly, pound platform group and linkage rod. The clamping and pressing assembly is set on the horizontal table of stand top, including movable clamp holder, fixed clamp holder and adjusting rod, adjusting rod is connected to the bottom of fixed clamp holder and can be slidably adjusted, movable clamp holder is connected with linkage rod by connecting rod assembly. The pound platform group is set below stand, including guide rod, pound seat and deflection rod, pound seat is used for loading weight, its bottom and deflection rod sliding contact, deflection rod middle part and linkage rod bottom end rotationally connected, other end and stand rotationally installed. The adjusting rod bottom is equipped with ratchet bar, and is locked by cooperating with lock tooth plate engagement, and deflection rod and stand are equipped with tension spring. By single operation of linkage rod, clamping and loading action can be realized simultaneously, and have self-resetting function. The equipment structure is compact, convenient to adjust, test efficiency is high, suitable for different specifications weighing elastomer's fast and stable clamping and loading test.

The invention relates to a clamping pad (4) for a device for holding a tube (6) by means of friction, comprising a steel casing (8) in which a cavity (10) provided with a bottom (12) and two lateral edges (14) is formed. The cavity is filled with a flexible polymer material (16) in which a plurality of gripping bars (18a, 18b) are housed. The lateral gripping bars (18a) each have a different geometrical shape from the other gripping bars (18b) and each have a lateral face (22a) having a rounded profile matching the profile of the corresponding lateral edge of the cavity and which is in sliding contact therewith. Means (24) are provided for confining the flexible material in the cavity between the gripping bars at their respective contact face.

The invention relates to an aerosol-generating device. The aerosol-generating article comprises a heating device (14). The heating device comprises an induction coil (16). The aerosol-generating device further comprises a first sliding device (18). The first sliding device (18) comprises a first contact (22). The first sliding device (18) is arranged adjacent to the induction coil (16) of the heating device (14) and is configured to slide parallel to a longitudinal axis of the induction coil (12). The first contact (22) is mounted on the first sliding device (18) and is arranged to contact the induction coil (12). The aerosol-generating device further comprises a second sliding device (20). The second sliding device (20) comprises a second contact (24). The second sliding device (20) is arranged adjacent to the induction coil (16) of the heating device (14) and is configured to slide parallel to a longitudinal axis of the induction coil (16). The second contact (24) is mounted on the second sliding device (20) and is arranged to contact the induction coil (16). An alternating current is supplied to the induction coil (16) between the first contact (22) and the second contact (24).

The application provides a pipe pile system, which comprises a first pipe pile section and a plurality of second pipe pile sections, one end of the first pipe pile section is sleeved with one of the second pipe pile sections, the other end of the first pipe pile section is sleeved with a hammering section, and the second pipe pile sections are sleeved with each other; wherein the hammering section comprises a sleeve and a hammering part in sliding contact with the inner wall of the sleeve, the hammering part has a hammering end away from the second pipe pile section, and the hammering end can extend out of the sleeve along with the sliding of the hammering part and the sleeve. The application also provides a construction method of the pipe pile system, and solves the problem that the pipe pile assembly is prone to deviation after construction in the prior art, thereby causing deviation from the construction requirements.

The utility model belongs to the technical field of one-way valves, and particularly relates to a one-way valve with a stop function, which comprises a valve body, and a liquid inlet pipe and an outflow pipe are respectively arranged at two ends of the valve body. A baffle of an annular structure and a fixing plate of a strip-shaped structure are arranged in the valve body in the direction from the liquid inlet pipe to the outflow pipe, a push rod is movably connected to the fixing plate in an inserted mode, a push plate used for blocking the baffle is fixedly connected to one end of the push rod, a spring arranged on the push rod in a sleeving mode is arranged between the push plate and the fixing plate, and a sliding block is arranged at the other end, away from the baffle, of the push rod. A cam in sliding contact with the sliding block is further movably arranged in the valve body, and a driving assembly is arranged on the inner wall of the valve body and used for driving the cam.

The invention relates to the technical field of semiconductor processing, and particularly discloses a combined splicing structure for a semiconductor processing mold and a use method thereof.The combined splicing structure comprises a lower mold mechanism, an auxiliary mechanism is arranged on the lower mold mechanism, and an upper mold mechanism is further arranged above the lower mold mechanism. When injection molding of a mold product needs to be carried out, a first piston rod of a first air cylinder is used for pushing, a jacking plate can drive a connecting rod to move, an annular plate can make sliding contact with the conical surface of the outer wall face of a conical table, and in the process that the annular plate does not rise, due to the fact that the inner diameter of the annular plate is not broken, the annular plate cannot be lifted; when the lower mold and the mold groove are split, the lower mold and the mold groove continuously make contact with the conical surface of the outer wall of the conical table with the outer diameter gradually increased, so that the splicing blocks of the conical table split in the four directions can be folded inwards and closed, and therefore the lower mold and the mold groove which are split in the same mode can be synchronously driven to be folded, closed and spliced; and the lower mold and the mold groove form a complete mold seat structure for injection molding.