369 results about "Rotational molding" patented technology

An internally reinforced thermoplastic container has a body manufactured using rotational molding. Prior to molding, attachment elements are releasably attached to the interior surface of parts of a mold, and an initially separate tension member is connected between the attachment elements. The mold is closed and a body of the container molded such that the attachment elements are integrated into the walls of the body. After molding, the attachment elements are released from the mold. The attachment elements and the tension member define a tension structure to resist outward bulging of the container walls. The tension member may be tensioned prior to or after molding of the container body. The attachment elements may take the form of eyelets having a base incorporated into the wall of the container body. The method enables the formation of a hollow thermoplastic container with integrally formed internal reinforcement.

The utility model relates to the technical field of rotational molding, in particular to a full-automatic rotational molding rotary molding device which comprises a base and a molding device, a lower box body is arranged on the base; the forming device comprises a first mold, a second mold hinged to the first mold, a first fixing block and a second fixing block which are arranged on the first mold and the second mold respectively, a connecting shaft and a clamping block which are arranged on the first fixing block, and a driving assembly for driving the connecting shaft to rotate, and the connecting shaft penetrates through the lower box body and is rotationally connected with the lower box body; the second fixing block is provided with a groove for the clamping block to be embedded. According to the utility model, the structure is simple, the workpiece can be prevented from being adhered to the die cavity, the forming speed of the workpiece can be increased, and the processing efficiency is further improved.

The utility model relates to the technical field of rotational molding molds, in particular to a locking mechanism for an upper mold and a lower mold of a rotational molding mold. The die comprises an upper die body and a lower die body, a flange plate is arranged on the upper die body, the flange plate is provided with threaded holes which are coaxially formed, two clamping plates are arranged on the flange plate in a relatively sliding mode, and fixing blocks are arranged on the two clamping plates in a sliding mode; a connecting frame is arranged on the lower die, a fixing rod is arranged on the connecting frame in a sliding mode, an external thread sleeve is rotationally arranged on the fixing rod and is in threaded connection with the threaded hole, and a spring a is arranged between the connecting frame and the fixing rod. According to the utility model, the fixing rod is fixed by moving the clamping plate, so that the upper die and the lower die are locked together, and the production cost of workpieces is reduced.

The invention relates to the technical field of chemical engineering, and discloses nylon powder for a hydrogen storage bottle inner container and a preparation method thereof, the hydrogen storage bottle inner container and a forming process thereof.The method comprises the following steps that S1, nylon resin, an antioxidant and an organic solvent are mixed, heat preservation is conducted for 15 min to 120 min at the temperature of 140 DEG C to 160 DEG C, and a mixed solution A is formed; s2, the mixed solution A is cooled to 25-60 DEG C, nylon resin is separated out, and slurry B is formed; and S3, removing the organic solvent in the slurry B, and drying to obtain the product. According to the preparation method, the nylon resin and the antioxidant are jointly dissolved in the organic solvent at the specific temperature, the cooling and precipitation conditions are controlled, reconstruction and optimization of the particle size and morphology of the powder are effectively achieved, the obtained powder has the high sphericity degree, uniform particle size distribution and good fluidity, and the preparation method is suitable for industrial production. The melt consistency and the spreading performance in the rotational molding process are improved, the integrity and the air tightness of the hydrogen storage bottle liner structure are improved, and the problems that existing nylon powder is poor in particle size control, insufficient in fluidity and the like are solved.

The present invention relates to the technical field of plastic mold production, specifically, to a rotational molding device and method for producing parts of children's amusement slides, including a mold placement mechanism and heat dissipation mechanisms arranged on the left and right sides of the mold placement mechanism. The mold placement mechanism includes a swinging cantilever, a mold placement frame that rotates as the swinging cantilever rotates, and a first driving motor that drives the swinging cantilever to rotate. For this rotational molding device and method for producing parts of children's amusement slides, when the second driving motor is started, the reciprocating lead screw rotates to drive the moving part to reciprocate in the swinging frame. At the same time, through the transmission part, the overall angle of the swinging frame is changed, thereby increasing the coverage range of the cooling fan inside the moving part, optimizing the air flow distribution, and improving the uniformity of mold heat dissipation.

The invention relates to the technical field of macromolecular polyethylene foam materials, and discloses a chemical foaming agent as well as a preparation method and application thereof. The chemical foaming agent contains azodicarbonamide and ammonium dihydrogen phosphate, and on the basis of the total weight of the chemical foaming agent, the content of the azodicarbonamide is 10-40 wt%, and the content of the ammonium dihydrogen phosphate is 60-90 wt%. According to the chemical foaming agent, the thermal decomposition initial temperature of azodicarbonamide is promoted to be reduced through ammonium dihydrogen phosphate, the decomposition process is controllable, foam pore distribution is more uniform, and foaming gas released in the polyethylene rotational molding foaming forming process is mainly CO2, so that the chemical foaming agent is more environment-friendly and energy-saving when being used in the polyethylene rotational molding foaming forming process.

The present invention belongs to the technical field of polymer composite materials, and relates to a COFs flame-retardant polyethylene composite material for rotational molding and a preparation method thereof. The composite material comprises the following components: linear low-density polyethylene 15.0% - 35.0%, low-density polyethylene 35.0% - 55.0%, and a flame-retardant masterbatch; the flame-retardant masterbatch comprises the following components: linear low-density polyethylene 10.0% - 35.0%, carbon nanotubes 0% - 10.0%, Cu@COFs-COOH 1.0% - 12.0%, a toughening agent 1.0% - 10.0%, polyethylene wax 1.0% - 10.0%, and an antioxidant 1.0% - 10.0%; the proportions are all in mass percentages. The composite material of the present invention can isolate oxygen under high-temperature conditions, reduce the surface temperature, reduce the release of heat, and form a porous foam carbon layer, so as to significantly improve the flame-retardant effect. Moreover, compared with traditional halogen flame retardants, no toxic gas is generated, and it is more environmentally friendly.

The utility model discloses an integrated liquid storage barrel based on a zinc-bromine flow battery, and belongs to the field of zinc-bromine flow batteries, the integrated liquid storage barrel comprises a liquid storage barrel shell, a liquid storage barrel upper cover, a zinc side pipeline group and a bromine side pipeline group, an isolation plate is arranged in the liquid storage barrel shell, and the liquid storage barrel is divided into two independent spaces, namely a zinc side liquid storage barrel and a bromine side liquid storage barrel, by the isolation plate; an overflow port is formed in the upper end of the isolation plate; the zinc side pipeline group and the bromine side pipeline group are arranged on the upper cover of the liquid storage barrel; a pipeline extending downwards is arranged on the back surface of the upper cover of the liquid storage barrel; a rotational molding processing technology is changed into an injection molding technology, so that the downward extending pipeline in the barrel can be subjected to injection molding; and the injection molding process can improve the size precision, and subsequent automatic assembly is facilitated.

A rotator lubricating device for pickling-free drawing of wires relates to the technical field of pre-coating equipment for metal deep processing, a wire drawing powder box is arranged at the front end of a rotator die box, the die box is positioned in the wire drawing powder box and is connected with the rotator die box, and one side of the rotator die box far away from the wire drawing powder box is connected with a rotating mechanism. A waterproof plate is arranged at the position, close to the rotating mechanism, of the rotating body die box, a supporting plate is arranged in the middle of the rotating body die box, a wire drawing powder box is additionally arranged in front of the rotating body die box, powder is added again to lubricate the surface of a drawn steel wire in advance, and a die is additionally arranged at an outlet of the powder box, so that wire drawing powder can be attached to the surface of the steel wire conveniently; the water retaining ring is additionally arranged on the rotary die seat, so that die cooling water is prevented from being splashed to the surface of a wire rod and damaging a coating layer, the heating value in the wire rod rotary forming and drawing process is greatly reduced, and the purpose of increasing the drawing speed of a steel wire rotary forming pass is achieved.

The invention discloses fin forming equipment and a fin forming method, and relates to the technical field of fin machining. The forming module is used as a lower die during fin forming and stamping; the punching assembly is fixedly arranged over the forming station of the forming table. The punching assembly can punch and cut off materials on the forming module at the same time. The device has the beneficial effects that when the stamping module is matched with the forming module to stamp the metal belt, the metal belt is cut through the cutting module, so that the problem that after stamping equipment stamps the metal belt released by an unwinding machine, belt-shaped fins need to be continuously conveyed to cutting equipment to be cut, and the production efficiency is greatly improved is effectively solved. The problems that the fin forming machining process needs to depend on cutting equipment and direct forming cannot be achieved through stamping equipment due to the fact that the fins cannot be cut while punch forming is conducted are solved, and then the technical effects of punch forming and automatic cutting of metal belts are achieved.

The utility model belongs to the technical field of rotational molding molds, and discloses a mold closing positioning mechanism for a rotational molding mold, which comprises a fixed mold, a first fixing ring is fixedly sleeved on the front side of the outer surface of the fixed mold, and a guide port is arranged in the first fixing ring. By arranging the guide opening, the inclined block, the positioning rod and the through hole, an operator pushes the movable mold to move towards the fixed mold, at the moment, the positioning rod can move towards the interior of the guide opening, and when the positioning rod is not accurately aligned with the positioning hole, the rear end of the positioning rod can be in contact with the inner surface of the guide opening, so that the positioning rod is prevented from being damaged. According to the mold, the guide opening is formed in the fixed mold, so that the movable mold gradually slides into the positioning hole along the inclined surface of the guide opening along with the movement of the movable mold, precise positioning of the fixed mold and the movable mold is realized, and after the positioning rod enters the fixed block, the inclined block is inserted into the through hole, so that the positioning rod and the movable mold are fixed, and an operator can conveniently close the mold.

The utility model discloses a PO (polyolefin) rotational moulding steel lining polytetrafluoroethylene pipeline, which relates to the field of steel lining polytetrafluoroethylene pipelines and comprises a pipe body, a fixed flange plate is mounted at one end of the pipe body, a sliding flange plate is slidably arranged on the other side of the pipe body, and a plurality of groups of guide columns are arranged on one side of the sliding flange plate. A corresponding inserting hole is formed in the fixed flange plate, a first inserting rod is arranged in the inserting hole through an elastic assembly, and a sealing ring is connected to the other end of the first inserting rod. The sealing ring is limited under the action of the bolt assembly, so that the installation and connection work of two groups of pipe bodies is completed, the first insertion rod drives the sealing ring to move towards the inner side of the pipeline in the insertion process of the guide column, the sealing ring is attached to the outer wall of one end of the pipe body, the sealing ring can be prevented from being damaged during connection in the process, and the service life of the pipe body is prolonged. The service life of the whole sealing ring is prolonged, and the replacement frequency of the sealing ring by subsequent workers is reduced.

The utility model relates to the technical field of shuttling type rotational molding machines, in particular to a multi-arm shuttling type rotational molding machine which comprises a base, a rotational molding machine body and a sliding rail are installed on the base, the rotational molding machine body is connected with the base through the sliding rail in a sliding mode, a rotating disc is installed on the rotational molding machine body, and the multi-arm shuttling type rotational molding machine further comprises an escalator arm which is provided with a first supporting foot and a second supporting foot. The first supporting leg and the second supporting leg are arranged on the two sides of the escalator arm respectively and located at the bottom of the escalator arm, a connecting base is arranged on the base, the top of the connecting base is rotationally connected with the first supporting leg through a pin shaft, and the bottom of the connecting base is rotationally connected with the base through a bearing. The unfolding process and the folding process of the escalator arm do not need to occupy much time, operation is convenient, a traditional external escalator arm is replaced with the technical scheme, the processes of moving and fixing the escalator arm are omitted, and the installation efficiency of the mold is improved.

The invention relates to a die for non-normal-pressure rotary forming of an IV-type hydrogen storage bottle inner container and application of the die. The die comprises a die body, a left end cover, a right end cover, a fixing assembly and a bottle opening assembly. The mold main body is provided with a mold main body flange; the left end cover and the right end cover are provided with end cover flanges, and positioning structures are arranged between the end cover flanges and the mold body flanges. The fixing assembly comprises two end cover fixing frames and two main body fixing frames; the bottle opening assembly comprises an occupying pipe, an annular piece, a sealing gasket and a sealing device. The annular piece is provided with an internal thread, and the end, extending out of the bottle opening, of the BOSS insert is provided with an external thread; the annular piece is installed on the BOSS insert through the external thread and the internal thread and abuts against the limiting structure of the occupying pipe. The sealing device is installed on the outer side of the annular piece, and sealing gaskets are arranged between the annular piece and the BOSS insert and between the sealing device and the annular piece. The mold disclosed by the invention can meet the air tightness requirement of non-normal pressure rotational molding equipment, and is suitable for preparing rotational molding products with high compactness and low hole defects.

The utility model discloses an anti-drop type steel lining rotational molding storage tank, which comprises a tank body, an assembling device is arranged on the outer side of the tank body, a fast-assembling device is arranged on the outer side of the tank body, the fast-assembling device comprises a fast-assembling rod, a fast-assembling sleeve, a receding groove, an inserting rod and an inserting groove, the fast-assembling sleeve is detachably sleeved on the outer side of the fast-assembling rod, the inserting rod is movably arranged in the receding groove, and the inserting groove is arranged on the outer side of the fast-assembling rod. The receding groove penetrates through the side wall of the quick-assembly sleeve, the inserting groove is formed in the outer side of the quick-assembly rod, one end of the inserting rod is inserted into the inserting groove, a quick-disassembly mechanism is arranged on the outer side of the quick-assembly rod and comprises a sliding sleeve, a rack, a matching sleeve, a gear, a threaded sleeve and a threaded rod, the sliding sleeve is slidably installed on the outer side of the quick-assembly sleeve, the rack is fixedly connected to one side of the sliding sleeve, and the matching sleeve is fixedly connected to the other side of the sliding sleeve. The matching sleeve is detachably arranged on the outer side of the fast-assembly sleeve in a sleeved mode, the gear is arranged on the outer side of the thread sleeve in a sleeved mode, the thread sleeve is movably installed in the matching sleeve, the thread sleeve is arranged on the outer side of the screw rod in a sleeved mode through threads, and the screw rod is connected to one side of the clamping frame.

The present application discloses a type IV hydrogen storage bottle plastic liner and its preparation method, belonging to the technical field of high-pressure hydrogen storage containers. The preparation method of the type IV hydrogen storage bottle plastic liner comprises: uniformly mixing thermoplastic plastic, masterbatch and silane coupling agent to form a premix, then placing the premix into a twin-screw extruder for extrusion and granulation, the screw temperature is 220-240°C, and the speed is 100-120rpm; grinding the prepared pellets and passing them through a 40-60 mesh sieve to obtain rotational molding material, then drying the rotational molding material at 80-90°C for 5-8 hours, and then rotationally molding at 5-25rpm and 200-350°C for 8-15 minutes; annealing the molded workpiece, and then air cooling it to room temperature to obtain the type IV hydrogen storage bottle plastic liner. The liner has good hydrogen permeability and mechanical properties, so it is not easy to fail during the hydrogen charging and discharging process and under load impact, thus avoiding accidents.

The utility model discloses a main shaft structure of rotational molding equipment, which comprises a rotating cylinder, one side of the rotating cylinder is connected with a support rod, one side of the rotating cylinder is provided with a mounting plate, the surface of the mounting plate is rotatably connected with a main shaft, the other side of the surface of the mounting plate is connected with a servo motor, and an output shaft of the servo motor is connected with the main shaft. A first rotating frame and a second rotating frame are connected to the two ends of the rotating shaft, a bevel gear ring is connected to the surface of the first rotating frame, a bevel gear is connected to one end of the main shaft, the bevel gear is driven by one end of the main shaft to rotate, the engaged bevel gear ring is driven by the bevel gear to rotate, and the first rotating frame is driven by the bevel gear ring to rotate; therefore, the rotating shaft is driven to rotate by the rotating first rotating frame, and the second rotating frame is driven to rotate by the rotating rotating shaft, so that one servo motor can drive the first rotating frame and the second rotating frame to rotate in the upper direction and the lower direction at the same time, and the energy consumption and the production cost are greatly reduced.

The utility model discloses a feeding device for small rotational molding balls, which comprises a lower die holder, one end of the lower die holder is hinged with an upper die holder through a hinge, a plurality of lower die bins are uniformly distributed on the surface of the lower die holder, a plurality of upper die bins are uniformly distributed on the surface of the upper die holder, and the lower die bins and the upper die bins are used for processing the rotational molding balls after die assembly. A plurality of feeding hoppers matched with the lower die bins in number are evenly distributed on the surface of the feeding plate, and the lower die base and the upper die base are hinged through hinges, so that the dies can be opened relatively, the amount of raw materials in the lower die bins can be checked conveniently after feeding is finished and the feeding plate is removed, it is ensured that the amount of the raw materials in each lower die bin meets the production requirement, and the production efficiency is improved. According to the feeding device, due to the design of the feeding plate and the feeding hopper, feeding can be conducted on a plurality of lower die bins at the same time, and compared with the mode that the dies are manually aligned to be fed one by one through the hopper, the feeding speed is greatly increased, and therefore the overall production efficiency is improved.

The utility model relates to the technical field of rotational molding box raw material mixing, and discloses a rotational molding box raw material mixing device which comprises a mixing bin and an upper cover, the bottom wall of the mixing bin is a conical surface, the upper cover is arranged at an opening in the upper portion of the mixing bin, and a rapid mixing assembly is arranged on the upper cover. The rapid mixing assembly is used for evenly mixing raw materials used before production of the rotational molding box, by reversely starting the motor, an output shaft of the motor can drive the spiral blade to reversely rotate through a series of mechanisms, and when the spiral blade rotates, acting force close to a discharging valve is applied to plastic powder in the mixing bin; the plastic powder can be effectively discharged from the mixing bin, and the problem that in a traditional mode, after being mixed, the plastic powder is fine in particles, has certain viscosity, can be attached into the mixing bin and is not prone to being completely leaked out, so that discharging of the mixed plastic powder is not smooth, and follow-up machining of a rotational molding box is affected is solved.

The utility model relates to the technical field of rotational molding oil tank production, in particular to an intelligent clamping device for rotational molding oil tank production, which comprises a bottom plate and an oil tank body, a clamping device is arranged at the top end of the bottom plate, a supporting block is fixedly connected to the top end of the bottom plate, and a baffle is fixedly connected to the side wall of the supporting block. The clamping device comprises a first telescopic air cylinder installed at the top end of the bottom plate, the top end of the first telescopic air cylinder is fixedly connected with a first installation block, a rotating motor is fixedly installed at the top end of the first installation block, the output end of the rotating motor is fixedly connected with a second installation block, and a second telescopic air cylinder is fixedly installed on the side wall of the second installation block. According to the intelligent clamping equipment for rotational molding oil tank production, the detection steps can be simplified, the detection efficiency can be improved, meanwhile, the effect of rapidly transferring the oil tank body can be achieved, the production efficiency of the oil tank body can be improved, and actual use is facilitated.

The utility model discloses a table body seat structure based on a hot rotational molding process, which belongs to the technical field of seats and comprises a base, the lower surface of the base is connected with a bottom plate in a clamping manner, the upper surface of the base is provided with a seat cushion, the upper surface of the base is connected with a backrest through bolts, and the surface of the backrest is provided with a back cushion; a lower connecting block is fixedly connected to the lower surface of the base, a groove is formed in the upper surface of the bottom plate, a first magnet is fixedly connected to the upper surface of the bottom plate, and a handle is movably arranged on the surface of the base; and a clamping block is arranged in the lower connecting block in a sliding manner. According to the table body seat structure based on the hot rotational molding process, when the backrest and the base are in butt joint, the mounting holes in the backrest are aligned with the mounting holes in the base, then bolts can be screwed on the backrest and the base through the opening position in the lower surface of the base, operation is rapid, and when the bottom plate is in butt joint, the lower connecting block is directly inserted into the groove, so that the operation is convenient. The operation process is fast and convenient.

The utility model discloses a stamping die in-die bending and rotating forming device, a bending and rotating mechanism further comprises a bending assembly and a rotating assembly, the bending assembly comprises an electromagnetic valve fixedly connected to one side of a lower die holder, one side of the electromagnetic valve is fixedly connected with an air cylinder, and the telescopic end of the air cylinder is fixedly connected with an upper die holder; a first connecting rod is fixedly connected to the center of the bottom of the upper die base, a fixing plate is fixedly connected to the top of the outer wall of the first connecting rod, and an electric telescopic rod is fixedly connected to one corner of the bottom of the fixing plate. Under the driving of the electric telescopic rod at the top of the male die, the male die at the bottom is driven to repeatedly compact the stainless steel elastic piece at the bottom, so that the stainless steel elastic piece at the bottom can be formed more thoroughly, and the precision of the elastic piece in the machining process of the stainless steel elastic piece is improved.

The present invention relates to the technical field of rotational molding, and specifically, to a rotational molding mold with a heat energy storage function, which includes a processing table. Above the processing table, a storage structure is provided. Above the processing table, an intermittent structure is provided. One side of the intermittent structure is provided with an adjustment structure. Through the convex column and the guide groove formed inside the heat preservation sleeve, the present invention enables it to rotate inside the heat preservation sleeve. When the first limiting ring rotates, the ventilation holes formed on the surfaces of the first limiting ring and the second limiting ring can intermittently coincide, so that the inside of the heat preservation sleeve is separated into two sealed areas. At this time, when cold air is injected into the heat preservation sleeve through the air inlet pipe, the hot air emitted by the shaping barrel can have sufficient time to mix with the cold air, and then the mixed hot air is extracted into the connecting pipe through the output shaft end of the air extractor, avoiding the situation that the shaping barrel cannot be fully cooled when storing hot air.

This invention relates to the field of edge computing technology, specifically to an edge computing monitoring system for rotational molding equipment for storage bins. The system includes a data access terminal, edge computing nodes, a state estimation program, and a control output terminal. The data access terminal obtains process formula numbers, stage switching signals, heating output status, temperature process values, rotation speed, and cooling execution status from the existing controller of the rotational molding equipment. The edge computing nodes generate a process state sequence according to time windows, identifying the heating, melting, homogenization, and cooling stages, and obtain a molding state estimate based on a thermal inertia state model that includes heat accumulation, heat dissipation attenuation, stage coupling, and boundary inheritance. The control output terminal outputs stage hold or stage switching correction commands based on the deviation between the molding state estimate and the target state trajectory. This system reflects the thermal inertia lag state of the rotational molding process locally on the equipment side, reducing molding state deviations caused by fixed time and single-point temperature judgments.

This invention provides an integrated rotational molding device for boxes, belonging to the field of plastic mold production technology. The device includes an upper mold and a lower mold, with a mold cavity between them. A movable insert is slidably mounted on the upper mold, extending deep into the mold cavity and abutting against the inner wall of the lower mold. When the movable insert slides, it can also retract into the upper mold. A filling cavity is provided in the lower mold. Through the movable insert, molten material can be covered onto it. Before the material covering the insert has completely cooled and solidified, the movable insert is retracted, separating from the material covering it. At this point, the center of the material is hollow. Molten material is then added to the hollow portion through the filling structure. After complete cooling, a stable reinforcing column is formed, improving the stability of the box and preventing dents.

The invention relates to a method and a device for manufacturing screw caps by thermoforming. The process includes the following steps: - Providing a film made of a thermoplastic material and heating the film; - Feeding the film between a lower tool and an upper tool, which are movable relative to each other in an axial direction perpendicular to the film, wherein the lower tool comprises a plurality of rotatable form segments, the impression surfaces of which have an external thread complementary to the internal thread of the closure body or an internal thread complementary to the external thread of the closure body; - Closing of the lower and upper tools while the film is subjected to differential pressure in order to reshape the film, forming the closure bodies on the impression surface of the rotatable mold segments; - Allow the foil to cool; - at least partial opening of the lower and upper tools, while the rotatable mold segments perform a rotation about the axial direction synchronized according to the pitch of the internal thread in order to remove the closure bodies from the mold segments; - Removing the film with the formed closure bodies from the lower and upper tools; and - Separating the individual closure bodies from the foil to obtain the screw caps.

The invention belongs to the technical field of nuclear fuel preparation, and particularly relates to a powder discharging structure used in the annular pellet green pressing process, which comprises an upper punch, a punch sleeve, an upper punch rod and a center rod. The base of the upper punch is used for being installed on the top of an upper punch rod. The punch sleeve is used for penetrating through the upper portion of the upper punch and is in threaded connection with the upper punch rod. A center hole and a powder discharging hole are formed in the upper punch. The powder discharging hole is formed in the side edge of the center hole. One end of the center rod is used for being installed at a center hole of an upper punch, and the other end of the center rod is used for being installed on rotary forming press equipment. The powder discharging hole is formed in the side edge of the center hole of the upper punch, so that the technical problem that the upper punch is prone to breakage due to the fact that powder discharging is not timely in the annular pellet green pressing process is solved.

The utility model belongs to the technical field of tractors, and particularly relates to a tractor integrated rotational molding fuel tank which comprises a fuel tank body, the top of the fuel tank body is in threaded connection with a fuel tank cover, and the top of the fuel tank body is provided with a fuel inlet and a fuel return port which are communicated with the interior of the fuel tank body. The bottom of the oil tank body is provided with an oil outlet communicated with the interior of the oil tank body. An annular oil blocking structure is arranged at the bottom of the oil tank body. A fuel sensor is inserted into the fuel tank body; the fuel oil is stored in the annular oil blocking structure so as to achieve the purpose of storing the fuel oil, the annular oil blocking structure can achieve the function of storing the fuel oil at the fuel oil inlet pipe, the problem that when the fuel oil is insufficient or the whole vehicle goes uphill, the fuel oil is completely sucked to influence power is avoided, and the situation that the vehicle cannot go uphill due to the insufficient fuel oil when going uphill is solved. And meanwhile, the oil suction port, the liquid level sensor and the respirator are integrated in the fuel sensor, so that the functions are more concentrated, and the appearance is more attractive.

The invention provides a high-temperature rotational molding controlled-release cross-linked composition as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. The high-temperature rotational molding controllable slow-release cross-linked composition disclosed by the invention is prepared from the following components in parts by weight: 100 parts of high-density polyethylene resin, 0.05 to 0.5 part of free radical slow-release initiator, 0.05 to 2 parts of allyl assistant cross-linking agent, 0.05 to 0.2 part of main antioxidant and 0.1 to 0.5 part of auxiliary antioxidant. Through a two-stage rotational molding process, crosslinking is slowly released and controllably initiated at a high temperature, so that the influence on a high-density polyethylene crystalline region is reduced while the ESCR performance is greatly improved, and relatively low hydrogen permeability is kept. The high-temperature rotational molding controllable slow-release cross-linked composition can be applied to a compressed hydrogen plastic inner container for a vehicle.