200 results about "Rotational molding" patented technology

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 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 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 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 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.

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.

The utility model discloses an electromagnetic heating rotational molding cabin and rotational molding equipment thereof, which belong to the technical field of rotational molding machine heating, and comprise a rectangular cabin body, an electromagnetic heating device and a fan, the rectangular cabin body is internally provided with a partition wall, the partition wall divides the rectangular cabin body into a rotational molding chamber and a heating chamber, the partition wall is provided with an air return hole and an air supply hole, and the electromagnetic heating device is arranged in the rectangular cabin body. The electromagnetic heating device comprises a metal barrel and a heating coil, the heating coil is arranged outside the metal barrel and electrically connected with an electromagnetic power supply outside the rectangular cabin, the metal barrel is fixed in the heating chamber, an upper opening of the metal barrel is communicated with the air return hole, and a lower opening of the metal barrel is communicated with the air return hole. A lower opening of the metal barrel is communicated with an inlet of the fan, and an outlet of the fan is communicated with the air supply hole. Heat is supplied in an electromagnetic heating mode, the temperature is uniform, raw materials in the rotational molding mold are uniformly melted, the rotational molding quality of a product is improved, energy consumption is small, the production cost is reduced, and meanwhile the purpose of environmental protection is achieved.

The utility model relates to a hoisting and reinforcing device for a large rotational molding packaging box. The hoisting and reinforcing device is composed of a hoisting ring (1), a force bearing side plate (2), a transverse connecting rod (3) and a lifting mechanism (4). The bearing side plates (2) are divided into a left side plate and a right side plate, the transverse connecting rods (3) are connected with the left side plate and the right side plate on the upper side and the lower side respectively, the lifting mechanism (4) is composed of a lifting bottom plate (5) and a stop block (6), the lifting bottom plate (5) is used for bearing a large rotational molding packaging box body (7), a through hole is formed in the middle of the lifting bottom plate (5), and the bearing side plates (2) penetrate through the through hole in the middle of the lifting bottom plate (5). And the lifting bottom plate (5) is fixed by matching with the stop block (6). According to the hoisting reinforcing device, the hoisting stability and safety of the large rotational molding packaging box can be improved, meanwhile, the box body can be reinforced, and local deformation caused by hoisting is avoided.

The invention discloses water tank inner wall rotational molding equipment, and relates to the technical field of water tank rotational molding, the water tank inner wall rotational molding equipment comprises rails, an outer framework, an inner framework and a rotating shaft I. The rails are symmetrically arranged on the upper side and the lower side of a workpiece, jig rods are arranged on the upper side and the lower side of the workpiece, and driving wheels are in key connection with the outer sides of the jig rods; a horizontal bearing seat box is connected to the outer side of the jig rod, the first rotating shafts are symmetrically arranged on the two sides of the outer framework, a horizontal rotating bearing box is connected to the bottom end of the outer framework, the jig rod is connected into the horizontal rotating bearing box, and a limiting mechanism is arranged on the outer side of the inner framework. According to the novel middle limiting mechanism, the matched lifting structural part serves as a cooperative force transmission medium of the spring and the outer framework, the effective contact area is increased through the design of a boss and an arc-shaped face, radial displacement of the bottom end of the spring is precisely restrained, loads are stably transmitted when the spring stretches out and drastically improves the overall stability of cooperation of the spring and the outer framework.

A method is provided for producing discrete three-dimensional cellulose products from an air-formed cellulose blank structure in a rotary forming mould system. The method includes providing an air-formed cellulose blank structure, wherein the cellulose blank structure is air-formed from cellulose fibres; transporting the air-formed cellulose blank structure to a rotary forming mould system; feeding the air-formed cellulose blank structure to a position between a first mould part and a second mould part, and heating the air-formed cellulose blank structure; forming the three-dimensional cellulose products from the air-formed cellulose blank structure in the rotary forming mould system, by pressing the heated air-formed cellulose blank structure with a forming pressure.

The utility model discloses an integrated type multifunctional rotational molding box which comprises a box body, an adjusting frame is arranged on the outer side of the box body, fixing rods are fixedly connected to the two sides of the adjusting frame, fixing bases are fixedly connected to the two sides of the bottoms of the front face and the back face of the box body, and springs are fixedly connected to one sides of inner cavities of the fixing bases. One side of the spring is fixedly connected with a connecting rod, one side of the connecting rod is fixedly connected with a fixing frame, one side of the fixing frame is fixedly connected with an adjusting frame, one side of the adjusting frame is fixedly connected with a plug pin, and one side of the plug pin is connected with the fixing rod in an inserted mode. The adjusting frame is pulled outwards, the adjusting frame drives the plug pin to move, after the plug pin is far away from the fixing rod, the height of the adjusting frame can be vertically adjusted, after adjustment, the corresponding inserting hole and the plug pin are connected in an inserted mode, so that the adjusting work is completed, suction force is generated on the fixing frame through the magnetic block, thrust force is generated on the connecting rod through the spring, and therefore inserting connection is stable.

The utility model relates to a rotational molding sound box. The rotational molding sound box comprises a shell, an iron net and an elastic assembly, the iron net is arranged on the shell, and arc-shaped protrusions are arranged on the iron net; the elastic assembly comprises a first jacking piece, a limiting block and a second jacking piece, the first jacking piece is arranged on the iron net, the limiting block is connected with the first jacking piece, the second jacking piece is connected with the limiting block, an arc-shaped groove is formed in the limiting block, the arc-shaped protrusion is arranged in the arc-shaped groove, and the second jacking piece is arranged on the shell. According to the scheme provided by the invention, the installation process of the iron net of the rotational molding sound box can be simplified, and the assembly efficiency is improved.

The invention discloses a rotational molding simulation sample preparation device and a sample preparation method, and belongs to the technical field of testing, the rotational molding simulation sample preparation device comprises: a support assembly comprising a support seat; the mold assembly comprises a forming mold and a cover plate, the forming mold is provided with a mold cavity formed by sinking downwards from the top of the forming mold, the cover plate covers the upper side of the mold cavity in a sealing mode, and the cover plate is detachably connected with the forming mold; the cover plate is provided with two airflow channels, two ends of each airflow channel are respectively called an inner end and an outer end, the inner ends are communicated with the mold cavity, and the outer ends are connected with stop valves; and the action assembly comprises a plurality of telescopic rods, and the top ends and the bottom ends of the telescopic rods are connected with the forming mold and the supporting seat correspondingly. According to the sample preparation method, a rotational molding sample is prepared by using the simulated rotational molding sample preparation device. Simulation of the rotational molding process is achieved, sample manufacturing is completed, the sample manufacturing period is short, material consumption is low, cost is low, and the research and development progress can be accelerated.

The utility model discloses a multi-layer rotational molding hot melting composite floating body which comprises a shell integrally formed in a rotational molding mode, an equipment cabin formed by integrally concaving the surface of the shell and an EPS foaming body which is filled in the shell through an EPS foaming agent and wraps the equipment cabin are mainly arranged in the shell, and a cover plate for covering is arranged at a cabin opening of the equipment cabin. Therefore, after related equipment is arranged in the equipment cabin, the cover plate can cover the cabin opening and perform hot melting connection for sealing, and the related equipment is hidden in the equipment cabin, can be wrapped, damped and protected through the EPS foaming body and is isolated from seawater, so that better anti-collision protection, anti-corrosion protection and mounting firmness are provided for the mounted related equipment; therefore, the service life of related equipment is prolonged; meanwhile, related equipment can be independently arranged in one floating body, namely, the floating body can be independently disassembled, assembled and replaced more conveniently; and besides, the shell wall of the shell is compounded, so that better collision resistance and corrosion resistance can be achieved, and normal use is prevented from being influenced.

The utility model discloses a box rotational molding part shaping tool. The box rotational molding part shaping tool comprises an outer frame, side plates and positioning rings, a rotational molding box body is arranged in the outer frame, and positioning frames are arranged on the outer side of the outer frame at equal intervals; the side plate is arranged on the side edges of the multiple sets of positioning frames, and an air cylinder is arranged on one side of the side plate. Through the synergistic effect of air cylinder driving and the positioning mechanism, the movement and clamping force of the shaping plate can be accurately controlled, the product size qualification rate is effectively guaranteed, the defects of recession, deformation and the like of a rotational molding box body are avoided, and the product size qualification rate is guaranteed; the positioning frame, the side plate, the fixing plate and other parts are matched with one another, and the limiting rod and the limiting wheel have the guiding and limiting effects on the movement of the extrusion plate and the shaping plate, so that the accuracy and reliability of shaping operation are guaranteed; according to the tool, the box rotational molding part can be effectively clamped and shaped, and the defects such as sinking and deformation of a product in the cooling and shaping process are reduced, so that the product quality is improved.

This invention discloses a rotational molding microfiltration machine, including a housing and a rotating drum. The rotating drum includes a vertically vibrating and rotatable cylindrical frame. A vibration motor is provided at one end of the cylindrical frame, and an inlet is provided at the other end of the cylindrical frame. Wastewater enters the internal cavity of the cylindrical frame through the inlet and passes through a grid screen located around the perimeter of the cylindrical frame to filter out impurities in the wastewater. The impurities adhere to the inner surface of the grid screen. Guide plates are provided at equal angles on the inner surface of the grid screen, and a dirt collection area is formed between adjacent sets of guide plates. This invention utilizes the internal space of the cylinder by providing a flexible adhesive sheet that can swing and resembles a "cow's stomach" structure on the inner side of the filter screen, which greatly improves the efficiency of impurity adhesion. Moreover, with the rotation of the cylinder, the flexible adhesive sheet and the wastewater make surface contact, which easily increases the contact area between the wastewater and the flexible adhesive sheet, resulting in high filtration efficiency.

The invention discloses a material powder processing device for rotational molding of a storage tank. The material powder processing device comprises a crushing cylinder, a spiral conveyor and a raw material storage box, the crushing cylinder is composed of an integrated main shaft, a particle grading plate, a screening net and a screening driving device, provides a core cavity for the raw materials, and is used for performing stepped crushing on the raw materials from coarse to fine and screening the crushed raw materials; the tapered cavity and the crushing pendulum bobs with special inclination angles realize stepped crushing of raw materials under the guidance of the cavity, the multiple groups of pendulum bobs are accurately matched with the cavity, and only the standard raw materials are allowed to enter the next-stage cavity, so that each stage of cavity is ensured to concentrate on treating the raw materials with specific particle sizes; the crushing efficiency and uniformity are greatly improved, particle recovery is achieved through cooperation with a particle discharging opening and a collecting drawer, meanwhile, a scraper brush synchronously and circularly moves along with the integrated main shaft, the structure of the scraper brush is matched with a conical grading plate, a scraper pushes materials, and the brush cleans meshes to prevent blockage.

The invention discloses an anti-aging polyethylene rotational molding modified material and a preparation method thereof, and the modified material comprises the following raw materials: linear low density polyethylene, metallocene polyethylene rotational molding material, a modified additive, dicumyl peroxide, a modified filler and a Karst catalyst, in the melt extrusion process of the raw materials, part of double bonds on the modified additive can be grafted with polyethylene molecular chains, and the remaining double bonds are grafted with Si-H on the modified filler under the action of a Karst catalyst, so that the modified filler is uniformly dispersed in the material to form a protective layer; the surface of the modified filler contains a hydroxyl benzophenone structure, so that ultraviolet rays can be converted into harmless heat energy to be released, and an internal zirconium organic framework can absorb and scatter high-energy ultraviolet rays; the opportunity that ultraviolet rays directly act on polyethylene molecular chains is reduced, and the anti-aging effect of the material is further improved.

The utility model belongs to the technical field of rotational molding machines, and discloses a feeding mechanism for a rotational molding machine, which comprises a support frame and a rotational molding mold, the rotational molding mold is movably mounted in the support frame, a material storage mechanism is fixedly mounted above the support frame, a material supplementing opening is formed in the side surface of the rotational molding mold, and the material supplementing opening is communicated with the material storage mechanism. A discharging opening is formed in the side face of the material storage mechanism, and a feeding assembly is connected between the material supplementing opening and the discharging opening. The feeding assembly comprises a first feeding pipe arranged on one side of the rotational molding mold and one side of the storage mechanism. The feeding plug can ensure that the lower end of the first feeding pipe can be always communicated with the rotational molding mold, the upper end of the second feeding pipe can be always communicated with the material storage mechanism, and the first feeding pipe and the second feeding pipe can be inserted in a relatively sliding manner under the matching of the first feeding pipe and the second feeding pipe; therefore, when the rotational molding mold rotates continuously, the storage mechanism can always supplement raw materials into the rotational molding mold through the feeding assembly at any time.

The utility model discloses a bending mechanism capable of precisely rotating, forming and moving, which relates to the technical field of dies and comprises a male die component, a pressure plate and two female die components, the male die component is mounted on a lower die of the die, and the pressure plate and the two female die components are mounted on an upper die of the die; the male die assembly comprises a male die fixing base, male die inserts are arranged on the two sides of the male die fixing base respectively, the top faces of the male die inserts are used for containing workpieces, and the outer sides of the top faces of the male die inserts extend outwards to form forming parts. The material pressing plate is used for pressing the workpiece; the two female die assemblies are located above the corresponding male die inserts respectively, each female die assembly comprises a female die fixing base, a columnar rotating female die is horizontally and rotatably arranged at the bottom of each female die fixing base, and a forming groove matched with the forming part is formed in the rolling face of each columnar rotating female die.

A method of and fixture for molding a product with an embedded ring. A system for molding a ring into a product including a rotational molding mold with an opening formed in the rotational molding mold sized to fit a ring. A fixture is removably couplable to the ring, wherein the ring and the fixture when coupled are removably couplable in the opening. The fixture is removed from the ring after the ring is molded into a product. A method of manufacturing a product with an embedded ring includes: coupling a ring to a fixture; clamping the fixture and the ring in an opening in a mold top; clamping the mold top to a mold bottom; rotomolding a product; unclamping the fixture from the mold top; uncoupling the fixture from the ring; unclamping the mold top and the mold bottom; and removing the product from the mold.

Provided is a primer for use in forming fluororesin coating films by rotational molding, the primer being capable of forming coating films by rotational molding. This powdery composition comprises a meltable fluororesin powder having an average particle diameter of 100-1,000 μm and a binder resin powder.

The invention discloses a rotational molding assembly line. The rotational molding assembly line comprises a base; the rotational molding trolley is arranged on the base, is movable and is used for mounting a workpiece to be machined; the drying oven unit is arranged on the base and is used for carrying out rotational molding processing on the workpiece to be processed on the rotational molding trolley; and the cooling unit is arranged on the base and used for cooling the machined part subjected to rotational molding. The method has the advantages that the unit time productivity is improved, the problems of uneven wall thickness, size deviation and the like caused by manual operation are reduced, the defective rate is reduced, energy waste is reduced, the smoothness of the whole process is improved, the labor cost is reduced, meanwhile, the influence of manual operation errors on the production progress is avoided, the universality and expansion capacity of equipment are improved, and the production efficiency is improved. And the production requirements of different scales are met.