A rotational moulding machine

Abstract

The application relates to the field of rotational moulding technology, in particular to a rotational moulding machine which comprises a rolling mould, an opening is arranged at one end of the rolling mould, a mould cover is arranged at the opening of the rolling mould, a liquid collecting pool is arranged below the rolling mould, a rotating roller is rotatably connected to the upper end of the liquid collecting pool and is driven by a motor, the rolling mould is rotatably connected to the rotating roller, and a demoulding assembly further comprises a base, a pressure relief hole is arranged in the center of the upper end of the base, a sliding groove is arranged on the sidewall of the base, the sliding groove passes through the pressure relief hole, and a roller is arranged at the lower end of the base. In the process of demoulding of the product from the rolling mould, the demoulding assembly provides an upward supporting force, so that the collision caused by the contact between the product and the ground in the demoulding moment is avoided, the product is protected, and the demoulding of the product after moulding is more stable.

Description

Technical Field

[0001] This invention relates to the field of rotational molding technology, specifically a rotational molding machine. Background Technology

[0002] Rotational molding, also known as rotomolding, is a hollow molding method for thermoplastic plastics. The process involves adding plastic raw material into a mold, which is then continuously rotated and heated along two perpendicular axes. Under the influence of gravity and heat, the plastic material gradually and evenly coats, melts, and adheres to the entire surface of the mold cavity, forming the desired shape. After cooling and solidification, the product is demolded and the final product is obtained.

[0003] Demolding is a crucial component of rotational molding, and the smoothness of the demolding process directly affects the quality of the molded product. The existing demolding process for rotational molding is as follows: first, the end cap on one end of the mold is removed, and then the product is pulled out from one end of the mold. As the product is pulled, it gradually moves out from one end of the mold. Since the mold is at a certain height above the ground, at the moment the other end of the product detaches from one end of the mold, the product will fall to the ground and impact with the ground, causing damage to the outer surface of the product, which in turn affects the quality of the rotationally molded product.

[0004] In view of this, in order to overcome the above-mentioned technical problems, the present invention proposes a rotational molding machine, which solves the above-mentioned technical problems. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention proposes a rotational molding machine. This invention provides an upward support force through a demolding component during the process of the product separating from the mold, thereby avoiding the product from colliding with the ground at the moment of demolding and thus achieving the purpose of protecting the product and making the demolded product more stable.

[0006] The technical solution adopted by this invention to solve its technical problem is: a rotational molding machine according to this invention, comprising:

[0007] Rolling mold; one end of the rolling mold is provided with an opening;

[0008] A mold cover; the mold cover fits over an opening at one end of the rolling mold;

[0009] Liquid collection tank; the liquid collection tank is located below the rolling die;

[0010] A rotating roller; the rotating roller is rotatably connected to the upper end of the liquid collection tank and is driven by a motor; the rolling mold is rolledly connected to the rotating roller;

[0011] The rotational molding machine also includes:

[0012] Demolding assembly; the demolding assembly further includes:

[0013] A base; a pressure relief hole is provided through the center of the upper end of the base; a sliding groove is provided on the side wall of the base; the sliding groove passes through the pressure relief hole; a roller is provided at the lower end of the base;

[0014] A slider; the slider is slidably connected within the groove; one end of the slider is connected to the bottom of the groove by a spring; a through hole is provided at the upper end of the slider; the through hole connects to the pressure relief hole after the slider moves;

[0015] Sliding sleeve; there are multiple sliding sleeves; there are at least two sliding sleeves; two adjacent sliding sleeves are slidably and sealingly connected; the lower end of the outermost sliding sleeve is fixedly connected to the upper end of the base;

[0016] A support plate; the support plate is fixedly connected to the upper end of the innermost sliding sleeve; the support plate and the base are connected by a second spring;

[0017] Controller; the controller is used to control the automatic operation of the rotational molding machine.

[0018] Preferably, a support block is fixedly connected to one side of the base; an L-shaped plate is rotatably connected between the two support blocks; one end of the L-shaped plate abuts against the end of the slider away from the first spring; and the length of the other end of the L-shaped plate is greater than the length of one end of the L-shaped plate.

[0019] Preferably, the slider has a rectangular groove inside; the rectangular groove communicates with the through hole; the through hole is located in the middle of the rectangular groove; a sliding plate is slidably and sealingly connected inside the rectangular groove; a threaded hole is provided at the end of the slider away from the first spring; the threaded hole communicates with the rectangular groove; a screw is threadedly connected inside the threaded hole; the screw is rotatably connected to the outer wall of the sliding plate.

[0020] Preferably, two opposite edges at the upper end of the tray are provided with vertical plates; the two vertical plates are connected by a flexible membrane.

[0021] Preferably, the vertical plate is rotatably connected to the upper edge of the support plate by a torsion spring; a baffle is provided on the side of the two vertical plates that are far apart from each other; the baffle is fixed to the two side walls of the support plate; the baffle is used to limit the vertical plate; the flexible membrane is connected to the middle section of the vertical plate.

[0022] Preferably, the vertical plate includes a rotating shaft and sub-plates; there are multiple sub-plates; there are at least two sub-plates; one end of each sub-plate is rotatably connected to the rotating shaft; the rotating shaft is rotatably connected to the two edges of the upper end of the support plate via the torsion spring; the flexible membrane is composed of multiple flexible strips; there are at least two flexible strips; corresponding sub-plates are connected by flexible strips.

[0023] Preferably, the base has a sliding cavity inside; a first piston is slidably and sealingly connected to the inner wall of the sliding cavity; a push rod is fixedly connected to the upper end of the first piston; the push rod passes through the upper end of the base and is slidably and sealingly connected to the base; the first piston divides the sliding cavity into a rod-type cavity and a rodless cavity; the rodless cavity communicates with the outside; a circular groove is provided at the lower end of the base; a second piston is slidably and sealingly connected to the circular groove; the second piston divides the circular groove into an inner groove and an outer groove; the inner groove communicates with the rod-type cavity through an air hole; a T-shaped rod is rotatably connected to the lower end of the second piston; a roller is rotatably connected to the end of the T-shaped rod; a third spring is provided in the rodless cavity; the first piston is reset under the elastic force of the third spring.

[0024] Preferably, the lower end of the base is provided with an exhaust hole; the exhaust hole is connected to the rodless cavity; the lower end face of the base is provided with an exhaust groove; the exhaust groove is connected to the exhaust hole; and an elastic ring is fixedly connected to the opening of the circular groove.

[0025] The beneficial effects of this invention are as follows:

[0026] 1. The present invention provides an upward support force during the process of the product being released from the roller mold by the demolding component, thereby avoiding the product from colliding with the ground at the moment of demolding and thus achieving the purpose of protecting the product and making the demolding of the molded product more stable.

[0027] 2. The direct force applied by this invention is vertically downward, so that the base will not move during the opening or closing of the pressure relief hole; at the same time, through the simple lever principle, it is more labor-saving than the original, and the operation method of stepping on it is more labor-saving and convenient.

[0028] 3. This invention uses a screw rod to move a sliding plate within a rectangular groove, causing the opening of the through hole to increase or decrease as the sliding plate moves. This alters the cross-sectional area of ​​the gas discharged along the pressure relief hole, allowing the size of the pressure relief hole's cross-section to be changed based on the product's weight or strength. This changes the upward or downward movement speed of the pallet, and damping suppresses the upward or downward movement speed, thus controlling both the pallet's upward and downward movement speeds. This invention is applicable to products of varying weights and strengths. Attached Figure Description

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] Figure 1 This is a perspective view of the present invention;

[0031] Figure 2 This is a perspective view of the demolding component in this invention;

[0032] Figure 3 This is a perspective view of the demolding component in this invention from another angle;

[0033] Figure 4 This is a cross-sectional view of the demolding component in this invention;

[0034] Figure 5 yes Figure 4 Enlarged view of point A in the middle;

[0035] Figure 6 This is a motion diagram of piston No. 1 and piston No. 2 in this invention;

[0036] In the diagram: 1. Roller mold; 2. Mold cover; 3. Liquid collection tank; 4. Rotating roller; 41. Motor; 5. Demolding assembly; 51. Base; 511. Pressure relief hole; 512. Slide groove; 513. Slide cavity; 514. Piston No. 1; 515. Push rod; 516. Rod cavity; 517. Rodless cavity; 518. Circular groove; 519. Piston No. 2; 51a. Inner groove; 51b. Outer groove; 51c. Air hole; 51d. T-shaped rod; 51e. Spring No. 3; 51e. Exhaust groove. 51f, elastic ring 51g, roller 52, slider 53, through hole 531, rectangular groove 532, slide plate 533, threaded hole 534, screw 535, spring No. 1 54, sliding sleeve 55, support plate 56, vertical plate 561, flexible membrane 562, torsion spring 563, baffle 564, rotating shaft 565, dividing plate 566, flexible belt 567, spring No. 2 57, support block 58, L-shaped plate 581. Detailed Implementation

[0037] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0038] like Figures 1 to 6 As shown, the rotational molding machine of the present invention includes:

[0039] Rolling mold 1; one end of the rolling mold 1 is provided with an opening;

[0040] Mold cover 2; the mold cover 2 covers the opening at one end of the rolling mold 1;

[0041] Liquid collection tank 3; the liquid collection tank 3 is located below the rolling mold 1;

[0042] Rotating roller 4; the rotating roller 4 is rotatably connected to the upper end of the liquid collection tank 3 and is driven by motor 41; the rolling mold 1 is rolledly connected to the rotating roller 4;

[0043] The rotational molding machine also includes:

[0044] Demolding component 5; the demolding component 5 further includes:

[0045] A base 51; a pressure relief hole 511 is provided through the center of the upper end of the base 51; a sliding groove 512 is provided on the side wall of the base 51; the sliding groove 512 passes through the pressure relief hole 511; a roller 52 is provided at the lower end of the base 51;

[0046] Slider 53; the slider 53 is slidably connected in the groove 512; one end of the slider 53 is connected to the bottom of the groove 512 by a spring 54; a through hole 531 is provided through the upper end of the slider 53; the through hole 531 is connected to the pressure relief hole 511 after the slider 53 moves.

[0047] Sliding sleeve 55; there are multiple sliding sleeves 55; there are at least two sliding sleeves 55; two adjacent sliding sleeves 55 are slidably and sealingly connected; the lower end of the outermost sliding sleeve 55 is fixedly connected to the upper end of the base 51; the sliding and sealing connection between adjacent sliding sleeves 55 is the same as the principle of multi-section cylinder in the prior art.

[0048] Support plate 56; the support plate 56 is fixedly connected to the upper end of the innermost sliding sleeve 55; the support plate 56 and the base 51 are connected by a second spring 57;

[0049] Controller; the controller is used to control the automatic operation of the rotational molding machine;

[0050] During the demolding process, the end cap on one end of the mold is removed first, and then the product is pulled out from one end of the mold. As the product is pulled, it gradually moves out from one end of the mold. Since the mold is at a certain height from the ground, at the moment the other end of the product falls off from one end of the mold, the product will fall to the ground and impact with the ground, causing damage to the outer surface of the product, which in turn affects the quality of the product after rotational molding.

[0051] Therefore, the inventors first prepare the raw materials, using high-quality imported food-grade PE material. Then, they open the mold cover 2 from one end of the roller mold 1, add the raw material powder into the roller mold 1 according to the corresponding ratio, close the mold cover 2 at one end of the roller mold 1, and then start the controller to control the motor 41 to rotate. The motor 41 is fixed to the side wall of the liquid collection tank 3, and its output shaft is connected to the rotating roller 4. The roller mold 1 rests on the rotating roller 4, and the roller 4 drives the roller mold 1 to rotate. During the rotation of the roller mold 1, surrounding heating molds, such as heating guns, heat the surface of the roller mold 1 by spraying flames. After the raw material inside the roller mold 1 melts, the melted raw material is evenly distributed inside the roller mold 1. During the heating process... Temperature needs to be monitored in real time, which is existing technology and will not be elaborated further. After rotational molding for a period of time, cooling water is poured onto the surface of the mold 1, causing the cooling water to evaporate and absorb heat, thus cooling the surface of the mold 1. During the cooling process, the motor 41 continues to rotate, driving the mold 1 to rotate while cooling, thereby making the cooling of the mold 1 more uniform. Uniform cooling of the mold 1 means that the material inside the mold 1 cools more uniformly, allowing the material inside the mold 1 to solidify evenly. After cooling is complete, the controller stops the motor 41, then the mold cover 2 at one end of the mold 1 is opened, and the product is pulled out of the mold 1. After one end of the product is pulled out of the mold 1, that end of the product will bulge. After removing one end of the roller mold 1, move the demolding assembly 5 to below the product end protruding from the roller mold 1, i.e., push the base 51. Through the roller 52 at the lower end of the base 51, the base 51 is moved to below the product. Then, push the slider 53 by hand or foot to overcome the elastic force of the first spring 54, so that the slider 53 slides along the slide groove 512 towards the first spring 54. This allows the through hole 531 to connect with the pressure relief hole 511 after being moved by the slider 53, making the space inside the sliding sleeve 55 connected to the outside. Then, the second spring 57 will push the support plate 56 away from the base 51 under its own elastic force, so that the support plate 56 presses against the lower surface of the product under the elastic force of the second spring 57. Then, release the hand or foot holding the slider 53. The first spring 54 will then... When pressure is applied, the slider 53 is pushed to slide along the groove 512, thereby misaligning the through hole 531 with the pressure relief hole 511, thus closing the pressure relief hole 511 and preventing the gas inside the sleeve 55 from escaping. The product is then gradually pulled out from one end of the rolling mold 1. During this process, the demolding assembly 5 moves synchronously with the product on the ground. There can be one or two demolding assemblies 5. After the product is completely pulled out, it is pushed to the storage area, and the slider 53 is pressed again to connect the through hole 531 with the pressure relief hole 511. Under the weight of the product, the support plate 56 pushes against the second spring 57. The second spring 57 is compressed, and the gas inside the sleeve 55 is squeezed out and discharged through the pressure relief hole 511.This causes the distance between the support plate 56 and the base 51 to continuously decrease, bringing the product closer and closer to the ground. Then, the slider 53 is released, causing the through hole 531 and the pressure relief hole 511 to shift again. After the pressure relief hole 511 closes, the second spring 57 can no longer move the support plate 56 away from the base 51. Finally, after resisting the demolding assembly 5, the product is tilted and placed vertically for storage. At the moment the product detaches from the roller mold 1, the demolding assembly 5 prevents the product from falling directly to the ground and colliding with it, thus protecting the product's stability at the moment of demolding. In other words, at the moment the product detaches from the roller mold 1, the slider... The gas inside sleeve 55 and the elastic force of spring 57 provide a buffer to the product, thus protecting it. In this application, the demolding assembly 5 can hold the product at different heights as the gas enters the inner side of sleeve 55 along the pressure relief hole 511. Therefore, as part of the rotational molding machine, the demolding assembly 5 has a wider range of applications. In the prior art, the roller mold 1 is difficult to demold due to its height, and generally, the roller mold 1 is removed from the rotating roller 4 before demolding. However, in this application, demolding can be done directly without removing the roller mold 1 from the rotating roller 4. Therefore, this application is more efficient and convenient.

[0052] The present invention provides an upward support force by means of demolding component 5 during the process of the product being released from the rolling mold 1, thereby avoiding the situation where the product comes into contact with the ground at the moment of demolding and causing a collision, thus achieving the purpose of protecting the product and making the demolding of the molded product more stable.

[0053] In one embodiment of the present invention, a support block 58 is fixedly connected to one side of the base 51; an L-shaped plate 581 is rotatably connected between the two support blocks 58; one end of the L-shaped plate 581 abuts against the end of the slider 53 away from the first spring 54; the length of the other end of the L-shaped plate 581 is greater than the length of one end of the L-shaped plate 581.

[0054] During operation, when the pressure relief hole 511 needs to be opened, simply step on the other end of the L-shaped plate 581. Since the middle corner of the L-shaped plate 581 is rotatably connected between two support blocks 58, stepping on the other end of the L-shaped plate 581 causes one end of the L-shaped plate 581 to rotate via a lever, thus pressing one end of the L-shaped plate 581 against one end of the slider 53. After being pressed by one end of the L-shaped plate 581, the slider 53 slides along the groove 512, allowing the through hole 531 to connect with the pressure relief hole 511 after the slider 53 moves, thus opening the pressure relief hole 511. When the pressure relief hole 511 needs to be closed, simply remove your foot from one end of the L-shaped plate 581. The first spring 54 will then cause the slider 53 to press against one end of the L-shaped plate 581, pushing the L-shaped plate 581 to... After returning to its original position, the slider 53 is pushed by the first spring 54, causing the through hole 531 to be misaligned with the pressure relief hole 511, thereby closing the pressure relief hole 511. The pressure relief hole 511 can be opened or closed with the assistance of the L-shaped plate 581. Compared with the original embodiment, the direct force applied in this embodiment is vertically downward, while the force applied in the original embodiment is horizontal. Under the original force, the base 51 would be pushed and deviated from its original position, causing the position of the product to change and affecting demolding. In this embodiment, the force is vertically downward, so the base 51 will not move during the opening or closing of the pressure relief hole 511. At the same time, this embodiment uses a simple lever principle, which is more labor-saving than the original embodiment. The operation method of stepping on the pedal is more labor-saving and convenient.

[0055] In one embodiment of the present invention, a rectangular groove 532 is provided inside the slider 53; the rectangular groove 532 communicates with the through hole 531; the through hole 531 is located in the middle of the rectangular groove 532; a sliding plate 533 is slidably and sealingly connected inside the rectangular groove 532; a threaded hole 534 is provided at the end of the slider 53 away from the first spring 54; the threaded hole 534 communicates with the rectangular groove 532; a screw rod 535 is threadedly connected inside the threaded hole 534; the screw rod 535 is rotatably connected to the outer wall of the sliding plate 533.

[0056] During operation, with the pressure relief hole 511 open, the support plate 56 is pushed upwards by the elastic force of the second spring 57, causing it to contact the product. If the airflow enters the inner side of the sleeve 55 too quickly along the pressure relief hole 511, the support plate 56 will be momentarily fixed to the lower surface of the product by the elastic force of the second spring 57, resulting in impact noise and even damage to the product. Conversely, if the speed is too slow, it will cause low demolding efficiency. After demolding, the product needs to be lowered by the support plate 56. With the pressure relief hole 511 open, the product will compress the support plate 56, causing it to compress the second spring 57 under gravity, and allowing the gas in the sleeve 55 to escape through the pressure relief hole 511. If the gas escapes too quickly, it will cause the product to momentarily... The downward movement of the product can cause it to easily fall off the pallet 56. Since different product weights result in different downward movement speeds, the present invention addresses this by rotating the screw 535 before demolding. Rotating the screw 535 causes the sliding plate 533 to slide within the rectangular groove 532. This causes the opening of the through hole 531 to become larger or smaller as the sliding plate 533 moves, altering the cross-section of the gas discharged along the pressure relief hole 511. This allows the size of the pressure relief hole 511 to be adjusted according to the product's weight or strength, thus changing the upward or downward movement speed of the pallet 56. Damping is used to suppress the upward or downward movement speed of the pallet 56, controlling both the upward and downward movement speeds of the pallet 56 and the downward movement speed of the product. This method is suitable for products of different weights and strengths.

[0057] In one embodiment of the present invention, two opposite edges of the upper end of the tray 56 are provided with vertical plates 561; the two vertical plates 561 are connected by a flexible membrane 562.

[0058] During operation, as the second spring 57 pushes the support plate 56 upward, the support plate 56 will drive the vertical plate 561 and the flexible membrane 562 to move upward. The force of the second spring 57 pressing the support plate 56 causes the flexible membrane 562 to be squeezed and adhered to the lower surface of the product, so that the entire lower surface of the product can be supported by the flexible membrane 562. Through the flexible membrane 562, the flexible membrane 562 can support the lower surface of products of different shapes and specifications, thereby improving the stability of the supported product and expanding its application range.

[0059] In one embodiment of the present invention, the vertical plate 561 is rotatably connected to the upper edge of the support plate 56 by a torsion spring 563; a baffle 564 is provided on the side of the two vertical plates 561 that are far apart from each other; the baffle 564 is fixedly connected to the two side walls of the support plate 56; the baffle 564 is used to limit the vertical plate 561; the flexible membrane 562 is connected to the middle section of the vertical plate 561.

[0060] During operation, as the flexible membrane 562 supports the lower outer wall of the product, the product exerts a squeezing force on the flexible membrane 562. The flexible membrane 562 bends under this pressure, causing the vertical plates 561, which are fixed at both ends, to rotate inwards. During this rotation, the vertical plates 561 overcome the torque of the torsion spring 563 and press against the lower outer wall of the product. This achieves the purpose of supporting and holding the lower surface of the product through the two vertical plates 561, thereby reducing the amplitude of the product's swaying on the support plate 56 and greatly improving the stability of the support plate 56 in supporting the product. After the product is removed from the support plate 56, it no longer squeezes the flexible membrane 562, preventing the flexible membrane 562 from pulling on the vertical plates 561. The vertical plates 561 return to their original position under the torque of the torsion spring 563. The baffle 564 serves to limit the movement of the vertical plates 561, preventing them from flipping outwards due to the product's pressure.

[0061] In one embodiment of the present invention, the vertical plate 561 includes a rotating shaft 565 and a partition plate 566; there are multiple partition plates 566; there are at least two partition plates 566; one end of each partition plate 566 is rotatably connected to the rotating shaft 565; the rotating shaft 565 is rotatably connected to the two edges of the upper end of the support plate 56 via a torsion spring 563; the flexible membrane 562 is composed of multiple flexible strips 567; there are at least two flexible strips 567; corresponding two partition plates 566 are connected by flexible strips 567.

[0062] During operation, the flexible membrane 562 is composed of multiple flexible strips 567, allowing each strip 567 to be individually compressed. This means that even when adjacent outer wall shapes vary significantly, the compression of the flexible strips 567 on different shaped outer walls of the same product differs. Consequently, the flexible strips 567 drive the end plates 566 to individually clamp the outer wall of the product. This results in a closer fit between the flexible membrane 562 (i.e., the multiple flexible strips 567) and the outer wall, and a tighter clamping of the product by each end plate 566. This improves the stability of the demolding assembly 5 in supporting the product, allowing the demolding assembly 5 to move with the product, reducing relative slippage, and further enhancing stability.

[0063] In one embodiment of the present invention, a sliding cavity 513 is provided inside the base 51; a first piston 514 is slidably and sealingly connected to the inner wall of the sliding cavity 513; a push rod 515 is fixedly connected to the upper end of the first piston 514; the push rod 515 passes through the upper end of the base 51 and is slidably and sealingly connected to the base 51; the first piston 514 divides the sliding cavity 513 into a rod-type cavity 516 and a rodless cavity 517; the rodless cavity 517 communicates with the outside; a circular groove 51 is provided at the lower end of the base 51. 8; A second piston 519 is slidably and sealingly connected within the circular groove 518; the second piston 519 divides the circular groove 518 into an inner groove 51a and an outer groove 51b; the inner groove 51a is connected to the rod chamber 516 through an air hole 51c; the lower end of the second piston 519 is rotatably connected to a T-shaped rod 51d; the end of the T-shaped rod 51d is rotatably connected to a roller 52; a third spring 51e is provided within the rodless chamber 517; the first piston 514 is reset under the elastic force of the third spring 51e;

[0064] During operation, when the product needs to be unloaded from the pallet 56, the slider 53 is first pushed to open the pressure relief hole 511. The product will then press against the pallet 56 and the second spring 57, causing the pallet 56 to move closer to the base 51. The pallet 56 will then press against the push rod 515, which in turn presses against the first piston 514. This increases the space of the rod chamber 516 and decreases the space of the rodless chamber 517. With the gas pressure in the rod chamber 516 remaining constant, the pressure inside the rod chamber 516 decreases, creating a negative pressure in the rod chamber 516. The gas in the inner groove 51a enters the rod chamber 516 through the vent 51c. After the gas in the inner groove 51a is drawn away by the negative pressure, the second piston 519 slides upward along the circular groove 518. The second piston 519 drives the T-shaped rod 51d and the roller 52 to move upward, finally causing the roller 52 and the T-shaped rod 51d to retract into the outer groove 51b. This causes the lower end of the base 51 to contact the ground when the roller 52 retracts, thus changing the rolling friction between the base 51 and the ground into static friction, making the base 51 less likely to be pushed. The product, driven by the pallet 56, falls and eventually flips from the pallet 56 to a vertical position using the base 51 as a fulcrum. Compared to the original rolling base 51, which would have shifted during the product's vertical flip and thus failed to provide support, this embodiment utilizes the static friction between the base 51 and the ground to provide a limiting point and support for the product's flipping and straightening. Once the product has been moved to its limit position by the pallet 56, the slider 53 is released, and the product moves from the pallet 56... After leaving, press the slider 53 again to open the pressure relief hole 511 again. After the gas enters the inner side of the sliding sleeve 55, the second spring 57 drives the support plate 56 to reset. At the same time, the third spring 51e also drives the first piston 514 to move upward, so that the first piston 514 squeezes the gas in the rod chamber 516, so that the gas in the first piston 514 is squeezed into the inner groove 51a, so that the second piston 519 is pushed and moves downward along the circular groove 518. Finally, the T-shaped rod 51d and the roller 52 extend from the outer groove 51b, and the slider 53 is released again.

[0065] In one embodiment of the present invention, the lower end of the base 51 is provided with an exhaust hole 51c; the exhaust hole 51c is connected to the rodless cavity 517; the lower end face of the base 51 is provided with an exhaust groove 51f; the exhaust groove 51f is connected to the exhaust hole 51c; the opening of the circular groove 518 is annularly fixed with an elastic ring 51g; the pressure relief hole 511Y is connected to the exhaust groove 51f.

[0066] During operation, as piston 514 moves downward, it drives piston 519, T-shaped rod 51d, and roller 52 upward into the outer groove 51b. After the base 51 is in contact with the ground, the opening of the circular groove 518 is sealed by the elastic ring 51g. As piston 519 continues to move upward, a negative pressure is created in the outer groove 51b, causing the base 51 to be negatively attracted to the ground. Combined with the static friction between the base 51 and the ground, the stability of the base 51 on the ground is improved. As piston 514 moves downward, it pushes the gas in rodless chamber 517, causing the gas to be discharged along exhaust port 51c. This blows away impurities on the ground, reducing their impact on the base 51's adhesion to the ground. Exhaust groove 51f serves two purposes: firstly, it provides space for exhaust port 51c after the base 51 is in contact with the ground, and secondly, it increases the friction between the base 51 and the ground, thus increasing the static friction of the base 51 on the ground. As piston 519 moves downward, it increases the pressure in outer groove 51b.

[0067] The specific workflow is as follows:

[0068] First, the staff prepares the raw materials, using high-quality imported food-grade PE material. Then, they open the mold cover 2 from one end of the roller mold 1, add the raw material powder into the roller mold 1 according to the corresponding ratio, and then close the mold cover 2 at one end of the roller mold 1. Next, they start the controller to control the rotation of the motor 41. The motor 41 is fixed to the side wall of the liquid collection tank 3, and its output shaft is connected to the rotating roller 4. The roller mold 1 rests on the rotating roller 4, and the roller 4 drives the roller mold 1 to rotate. During the rotation of the roller mold 1, surrounding heating molds, such as heating guns, heat the surface of the roller mold 1 by spraying flames. After the raw material inside the roller mold 1 melts, the melted raw material is evenly distributed inside the roller mold 1. Real-time monitoring is required during the heating process. Temperature control is an existing technology and will not be elaborated further. After rotational molding for a period of time, cooling water is poured onto the surface of the mold 1. The cooling water evaporates and absorbs heat, carrying away the heat from the surface of the mold 1, thus cooling the surface of the mold 1. During the cooling process, the motor 41 continues to rotate, causing the mold 1 to rotate while cooling, resulting in more uniform cooling of the mold 1. Uniform cooling of the mold 1 means more uniform cooling of the material inside the mold 1, allowing the material inside the mold 1 to solidify evenly. After cooling is complete, the controller stops the motor 41, and then the mold cover 2 at one end of the mold 1 is opened. The product is then pulled out of the mold 1. After one end of the product is pulled out of the mold 1, that end of the product will protrude from the mold. At one end of 1, move the demolding component 5 to below the product end of the protruding roller mold 1, that is, push the base 51. Through the roller 52 at the lower end of the base 51, the base 51 is moved to the bottom of the product. Then, push the slider 53 by hand or foot to overcome the elastic force of the first spring 54, so that the slider 53 slides along the slide groove 512 towards the first spring 54. This allows the through hole 531 to connect with the pressure relief hole 511 after being driven by the slider 53, so that the space inside the slide sleeve 55 is connected to the outside. Then, the second spring 57 will push the support plate 56 away from the base 51 under its own elastic force, so that the support plate 56 is pressed against the lower surface of the product under the elastic force of the second spring 57. Then, release the hand or foot that is holding the slider 53. The first spring 54 will not be released. Under pressure, the slider 53 is pushed to slide along the groove 512, thereby misaligning the through hole 531 with the pressure relief hole 511, thus closing the pressure relief hole 511 and preventing the gas inside the sleeve 55 from escaping. The product is then gradually pulled out from one end of the rolling mold 1. During this process, the demolding assembly 5 moves synchronously with the product on the ground. There can be one or two demolding assemblies 5. After the product is completely pulled out, it is pushed to the storage area, and the slider 53 is pressed again to connect the through hole 531 with the pressure relief hole 511. Under the weight of the product, the support plate 56 pushes against the second spring 57. The second spring 57 is compressed, and the gas inside the sleeve 55 is squeezed out and discharged through the pressure relief hole 511.This causes the distance between the tray 56 and the base 51 to continuously decrease, bringing the product closer and closer to the ground. Then, the slider 53 is released, causing the through hole 531 and the pressure relief hole 511 to shift again. Once the pressure relief hole 511 closes, the second spring 57 can no longer move the tray 56 away from the base 51. Finally, after pressing against the demolding assembly 5, the product is tilted vertically and then stored.

[0069] When it is necessary to open the pressure relief hole 511, simply step on the other end of the L-shaped plate 581. Since the middle corner of the L-shaped plate 581 is rotatably connected between two support blocks 58, when the other end of the L-shaped plate 581 is stepped on, the lever causes one end of the L-shaped plate 581 to rotate, thereby pressing one end of the slider 53. After being pressed by one end of the L-shaped plate 581, the slider 53 slides along the slide groove 512, so that the through hole 531 connects with the pressure relief hole 511 after the slider 53 moves, thus opening the pressure relief hole 511. When it is necessary to close the pressure relief hole 511, simply step on the other end of the L-shaped plate 581. When one end of the L-shaped plate 581 is moved away, the first spring 54 will drive the slider 53 to press against one end of the L-shaped plate 581, pushing the L-shaped plate 581 back to its original position. After the slider 53 is pushed by the first spring 54, the through hole 531 and the pressure relief hole 511 are misaligned, thereby closing the pressure relief hole 511. This allows the pressure relief hole 511 to be opened or closed with the assistance of the L-shaped plate 581. Before demolding, the operator can turn the screw 535, which will cause the screw 535 to slide the slide plate 533 within the rectangular groove 532. This will cause the opening of the through hole 531 to become larger or smaller as the slide plate 533 moves, thus changing the air pressure. The body is discharged along the cross-section of the pressure relief hole 511; during the process of the second spring 57 pushing the support plate 56 to move upward, the support plate 56 will drive the vertical plate 561 and the flexible membrane 562 to move upward. Through the force of the second spring 57 squeezing the support plate 56, the flexible membrane 562 is squeezed and adhered to the lower surface of the product, so that the entire lower surface of the product can be supported by the flexible membrane 562; during the process of the flexible membrane 562 supporting the outer wall of the lower surface of the product, the product will give the flexible membrane 562 a squeezing force. After being squeezed, the flexible membrane 562 will bend, causing the flexible membrane 562 to drive the vertical plate 561 fixed at both ends to rotate inward. During the rotation of the vertical plate 561... It overcomes the torsion of the torsion spring 563. After rotation, the vertical plate 561 will abut against the lower outer wall of the product, achieving the purpose of supporting and clamping the lower surface of the product through the two vertical plates 561. By making the flexible film 562 into multiple flexible strips 567, each flexible strip 567 can be squeezed individually. Thus, when the shapes of some adjacent outer walls vary greatly, the compression of the flexible strips 567 on the different shaped outer walls of the same product is different. Thus, the flexible strips 567 drive the two end plates 566 to clamp the outer wall of the product individually, making the flexible film 562, i.e., the multiple flexible strips 567, fit the outer wall of the product more closely.When the product needs to be unloaded from the pallet 56, first push the slider 53 to open the pressure relief hole 511. The product will then press against the pallet 56 and the second spring 57, causing the pallet 56 to move closer to the base 51. The pallet 56 will then press against the push rod 515, which in turn presses against the first piston 514. This will increase the space of the rod chamber 516 and decrease the space of the rodless chamber 517. With the gas pressure in the rod chamber 516 remaining constant, the gas pressure in the rod chamber 516 will decrease, creating a negative pressure in the rod chamber 516, which will reduce the gas pressure in the inner groove 51a. The gas enters the rod chamber 516 through the air hole 51c. After the gas in the inner groove 51a is sucked away by the negative pressure, the second piston 519 slides upward along the circular groove 518. The second piston 519 drives the T-shaped rod 51d and the roller 52 to move upward, finally causing the roller 52 and the T-shaped rod 51d to retract into the outer groove 51b. This causes the lower end of the base 51 to contact the ground when the roller 52 retracts, thus changing the rolling friction between the base 51 and the ground into static friction. This makes the base 51 less likely to be pushed away and also makes the product more stable on the tray 56. The product is lowered and finally lifted from the support plate 56, using the base 51 as a fulcrum, and then flipped upright. After the product is moved to its limit position by the support plate 56, the slider 53 is released. After the product is removed from the support plate 56, the slider 53 is pressed again, causing the pressure relief hole 511 to open again. Gas enters the inner side of the sliding sleeve 55, and the second spring 57 drives the support plate 56 to reset. At the same time, the third spring 51e also drives the first piston 514 to move upward, causing the first piston 514 to compress the gas in the rod chamber 516, forcing the gas in the first piston 514 into the inner groove. Within 51a, the second piston 519 is pushed and moves downward along the circular groove 518, finally causing the T-shaped rod 51d and roller 52 to extend from the outer groove 51b, releasing the slider 53 again; as the first piston 514 moves downward, it drives the second piston 519, T-shaped rod 51d, and roller 52 upward into the outer groove 51b. After the base 51 is in contact with the ground, the opening of the circular groove 518 is sealed by the elastic ring 51g. As the second piston 519 continues to move upward, a negative pressure is formed in the outer groove 51b, causing the base 51 to be negatively attracted to the ground.

[0070] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description only, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and should not be construed as indicating or implying relative importance.

[0071] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rotational molding machine, comprising: Rolling mold (1); one end of the rolling mold (1) is provided with an opening; Mold cover (2); the mold cover (2) covers the opening at one end of the rolling mold (1); Liquid collection tank (3); the liquid collection tank (3) is located below the rolling mold (1); Rotating roller (4); the rotating roller (4) is rotatably connected to the upper end of the liquid collection tank (3) and is driven by a motor (41); the rolling mold (1) is rolledly connected to the rotating roller (4); The rotational molding machine is characterized in that it further includes: Demolding assembly (5); the demolding assembly (5) further includes: A base (51); a pressure relief hole (511) is provided through the center of the upper end of the base (51); a sliding groove (512) is provided on the side wall of the base (51); the sliding groove (512) passes through the pressure relief hole (511); a roller (52) is provided at the lower end of the base (51); A slider (53); the slider (53) is slidably connected in the groove (512); one end of the slider (53) is connected to the bottom of the groove (512) by a spring (54); a through hole (531) is provided at the upper end of the slider (53); the through hole (531) is connected to the pressure relief hole (511) after the slider (53) moves; Sliding sleeve (55); there are multiple sliding sleeves (55); two adjacent sliding sleeves (55) are slidably sealed and connected; the lower end of the outermost sliding sleeve (55) is fixedly connected to the upper end of the base (51); The support plate (56) is fixed to the upper end of the innermost sliding sleeve (55); the support plate (56) and the base (51) are connected by a second spring (57); Controller; the controller is used to control the automatic operation of the rotational molding machine; The base (51) has a sliding cavity (513) inside; a first piston (514) is slidably and sealingly connected to the inner wall of the sliding cavity (513); a push rod (515) is fixedly connected to the upper end of the first piston (514); the push rod (515) passes through the upper end of the base (51) and is slidably and sealingly connected to the base (51); the first piston (514) divides the sliding cavity (513) into a rod chamber (516) and a rodless chamber (517); the rodless chamber (517) communicates with the outside; a circular groove (518) is provided at the lower end of the base (51); the circular groove (518) is... 18) A second piston (519) is connected to the inner sliding seal; the second piston (519) divides the circular groove (518) into an inner groove (51a) and an outer groove (51b); the inner groove (51a) is connected to the rod chamber (516) through a vent (51c); the lower end of the second piston (519) is rotatably connected to a T-shaped rod (51d); the end of the T-shaped rod (51d) is rotatably connected to a roller (52); a third spring (51e) is provided in the rodless chamber (517); the first piston (514) is reset under the elastic force of the third spring (51e); The lower end of the base (51) is provided with an exhaust hole (51c); the exhaust hole (51c) is connected to the rodless cavity (517); the lower end face of the base (51) is provided with an exhaust groove (51f); the exhaust groove (51f) is connected to the exhaust hole (51c); the opening of the circular groove (518) is fixedly connected to an elastic ring (51g).

2. The rotational molding machine according to claim 1, characterized in that: One side of the base (51) is fixedly connected to a support block (58); an L-shaped plate (581) is rotatably connected between the two support blocks (58); one end of the L-shaped plate (581) abuts against the end of the slider (53) away from the first spring (54); the length of the other end of the L-shaped plate (581) is greater than the length of one end of the L-shaped plate (581).

3. The rotational molding machine according to claim 1, characterized in that: The slider (53) has a rectangular groove (532) inside; the rectangular groove (532) communicates with the through hole (531); the slide plate (533) is slidably and sealingly connected inside the rectangular groove (532); a threaded hole (534) is provided at the end of the slider (53) away from the first spring (54); the threaded hole (534) communicates with the rectangular groove (532); a screw (535) is threadedly connected inside the threaded hole (534); the screw (535) is rotatably connected to the outer wall of the slide plate (533).

4. The rotational molding machine according to claim 1, characterized in that: The upper end of the tray (56) has two opposite edges with vertical plates (561); the two vertical plates (561) are connected by a flexible membrane (562).

5. A rotational molding machine according to claim 4, characterized in that: The vertical plate (561) is rotatably connected to the upper edge of the support plate (56) by a torsion spring (563); a baffle (564) is provided on the side of the two vertical plates (561) that are far apart from each other; the baffle (564) is fixedly connected to the two side walls of the support plate (56); the baffle (564) is used to limit the vertical plate (561); the flexible membrane (562) is connected to the middle section of the vertical plate (561).

6. A rotational molding machine according to claim 5, characterized in that: The vertical plate (561) includes a rotating shaft (565) and a partition plate (566); there are multiple partition plates (566); one end of each partition plate (566) is rotatably connected to the rotating shaft (565); the rotating shaft (565) is rotatably connected to the two edges of the upper end of the support plate (56) through the torsion spring (563); the flexible membrane (562) is composed of multiple flexible strips (567); two corresponding partition plates (566) are connected by flexible strips (567).

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