Rubber forming equipment and using method thereof

Abstract

The invention relates to the technical field of rubber product processing and rubber recycling and reprocessing, and provides rubber forming equipment and a using method thereof.The rubber forming equipment comprises a machine body, an injection pipe, a hopper and a forming die, the injection pipe comprises an outer pipe, a rotating shaft, a partition plate, a spiral blade and a heating jacket, and the outer pipe is fixedly arranged on the machine body; the rotating shaft is rotatably and slidably arranged in the outer pipe; the partition plate is fixedly arranged on the rotating shaft and abuts against the inner wall of the outer pipe in a sealed mode, and a liquid through hole is formed in the partition plate. The spiral blade is fixedly arranged on the rotating shaft and abuts against the inner wall of the outer pipe. The heating sleeve is fixedly arranged on the outer side of the outer pipe. By arranging the partition plate and forming the liquid through holes in the partition plate, not only can incompletely molten rubber particles in rubber liquid flow be blocked and be fully heated and molten, but also impurities in the rubber liquid flow can be filtered, bubbles in the rubber liquid flow can be cut, and therefore the forming quality of rubber is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of rubber product processing and rubber recycling and reprocessing, and particularly relates to a rubber molding device and a method for using the same. Background Art

[0002] With the rapid development of modern industry, rubber products are increasingly widely used in various fields. From various rubber products in daily life to industrial equipment accessories, the demand for rubber products continues to grow. However, during the production, use, and disposal of rubber products, a large amount of waste rubber is generated. If these waste rubbers are not reasonably processed, it will not only cause a great waste of resources but also cause serious environmental pollution.

[0003] When recycling thermoplastic rubber, the recycled rubber products can be washed, crushed, directly heated to melt, and then made into new rubber products through molding processes such as injection molding, extrusion molding, and blow molding, such as automotive parts, toys, seals, etc. Or the recycled thermoplastic rubber can be blended with a certain proportion of new thermoplastic rubber or other polymers to improve its performance and then subjected to molding processing.

[0004] Injection molding is the most common method in the recycling and utilization of thermoplastic rubber, and this method is realized by relying on injection molding equipment. For example, an injection molding machine spraying device disclosed in the invention patent with the publication number CN118124086B sets an injection molding table and an injection molding die on the machine body, and sets a storage tank and an injection barrel on one side of the injection molding table. The recycled rubber is added into the injection molding die through the storage tank and the injection barrel, thereby realizing the recycling of waste rubber. However, when the waste rubber melts, there will be a problem of insufficient melting, and there will also be bubbles or impurities in the molten rubber liquid flow, which will affect the molding quality of the rubber. Summary of the Invention

[0005] In view of this, the present invention provides a rubber molding device and a method for using the same, which can isolate the incompletely melted rubber particles or impurities in the rubber liquid flow and ensure the molding quality of the rubber.

[0006] The technical solution of the present invention is realized as follows: On the one hand, the present invention provides a rubber molding device, including a machine body, an injection pipe, a hopper, and a molding die. Among them, the injection pipe includes an outer pipe, a rotating shaft, a partition plate, a spiral blade, and a heating sleeve. The outer pipe is fixedly arranged on the machine body; the rotating shaft rotates and slides in the outer pipe; the partition plate is fixedly arranged on the rotating shaft and is in sealing contact with the inner wall of the outer pipe. A liquid through hole is opened in the partition plate; the spiral blade is fixedly arranged on the rotating shaft and is in contact with the inner wall of the outer pipe; the heating sleeve is fixedly arranged on the outside of the outer pipe; the hopper and the molding die are both fixedly arranged on the machine body, and the two are connected through the outer pipe.

[0007] Based on the above technical solutions, preferably, the rotating shaft includes a sealing shaft, a feeding shaft, and a stirring shaft. Among them, the sealing shaft is sealingly arranged at one end of the outer tube far from the forming die and is rotationally and slidably connected to the outer tube; the feeding shaft is arranged at one end of the outer tube close to the forming die, and its outer diameter is smaller than the inner diameter of the outer tube, and both the feeding shaft and the sealing shaft are coaxially arranged with the outer tube; the stirring shaft is fixedly arranged between the sealing shaft and the feeding shaft, and the stirring shaft is not coaxially arranged with the outer tube; a feeding port is formed on the circumferential side of the outer tube, the hopper is communicated with the feeding port, and the feeding port is located at one end of the stirring shaft far from the feeding shaft.

[0008] More preferably, there are multiple stirring shafts, and the distances from the axes of the multiple stirring shafts to the axis of the outer tube are different; one ends of the multiple stirring shafts close to the sealing shaft are flush, and the lengths of the multiple stirring shafts are different.

[0009] More preferably, the distance from the axis of the stirring shaft to the axis of the outer tube is inversely proportional to the outer diameter of the stirring shaft.

[0010] Based on the above technical solutions, preferably, the injection tube further includes a cloth-feeding cylinder and a plug. Among them, the cloth-feeding cylinder is fixedly arranged on the side of the partition plate far from the forming die, its outer diameter is smaller than the inner diameter of the outer tube, and filter holes are formed on its circumferential side; the plug is sealingly fixed at one end of the cloth-feeding cylinder far from the partition plate, and the outer diameter of the plug gradually increases in the direction from the end far from the forming die to the end close to the forming die.

[0011] More preferably, the cloth-feeding cylinder includes a plurality of arc plates and a plurality of connecting plates. Among them, the plurality of arc plates are circumferentially arranged around the axis of the outer tube, and the distance between the circumferential side of the arc plate and the inner wall of the outer tube gradually decreases along the circumferential direction of the rotating shaft; the connecting plates and the plurality of arc plates are arranged alternately and are fixedly connected to enclose a cylindrical structure.

[0012] More preferably, the cloth-feeding cylinder further includes a plurality of material rods. The material rods are fixedly arranged on the arc plates and correspond to them one by one. The distance between the material rod and the inner wall of the outer tube is smaller than the distance between the arc plate and the inner wall of the outer tube; a plurality of card slots are evenly arranged on the circumferential side of the material rod along its axial direction. The inner wall of the card slot is flush with the circumferential side of the arc plate, and the distance between adjacent two card slots is smaller than half of the pitch of the spiral blade.

[0013] More preferably, the injection tube further includes a plurality of vibration balls. The vibration balls are arranged in the cloth-feeding cylinder; one end of the connecting plate close to the axis of the outer tube is arc-shaped and extends out of the inner side of the arc plate.

[0014] More preferably, the outer diameter of one end of the feeding shaft close to the molding die is greater than that of the end away from the molding die and its usage method.

[0015] In a second aspect, the present invention provides a usage method of a rubber molding device, including the following steps: S1, heating the heating sleeve and adding the recycled rubber raw materials into the hopper; S2, first using the speed reducer to drive the rotating shaft to rotate forward, and then driving the rotating shaft to slide in the direction close to the molding die to melt and convey the rubber raw materials into the molding die; S3, performing pressure holding and cooling on the rubber raw materials in the molding die; S4, using the speed reducer to drive the rotating shaft to rotate reversely and synchronously driving the rotating shaft to slide in the direction away from the molding die to move the un-melted rubber raw materials outside the cloth cylinder and the vibrating balls in the cloth cylinder to one end of the cloth cylinder away from the molding die; S5, opening the molding die and taking out the rubber product.

[0016] A rubber molding device and its usage method of the present invention have the following beneficial effects compared with the prior art:

[0017] (1) By setting the partition plate and arranging the liquid through holes in the partition plate, not only can the rubber particles that are not completely melted in the rubber liquid flow be blocked to make them fully heated and melted, but also the impurities in the rubber liquid flow can be filtered, and the air bubbles in the rubber liquid flow can be divided, thereby ensuring the molding quality of the rubber.

[0018] (2) By setting the cloth cylinder, the rubber particles that are not completely melted in the rubber liquid flow can be closer to the heating sleeve. By setting the cloth cylinder to include an arc plate, a connecting plate and a material rod, and arranging card slots on the material rod, not only can the rubber particles be extruded, but also the problem of rubber particle accumulation can be avoided, and the melting speed of the rubber particles can be accelerated. By arranging vibrating balls in the cloth cylinder, the rubber particles can be shaken off the cloth cylinder to avoid blockage of the filter holes and liquid through holes.

[0019] (3) By setting the rotating shaft to include a sealing shaft, a feeding shaft and a stirring shaft, setting the stirring shaft to be multiple and restricting the outer diameter of the stirring shaft, the rubber liquid flow can be stirred by using the rotating shaft, thereby further accelerating the melting efficiency of the rubber particles and improving the mixing uniformity of various rubber raw materials. Description of the Drawings

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a perspective view of a rubber molding device of the present invention.

[0022] Figure 2 It is a cross-sectional view of an injection pipe in a rubber molding device of the present invention.

[0023] Figure 3 It is a cross-sectional view of a partition in a rubber molding device of the present invention.

[0024] Figure 4 It is a cross-sectional view of a cloth cylinder in a rubber molding device of the present invention.

[0025] Figure 5 It is a perspective view of a stirring shaft and a feeding shaft in a rubber molding device of the present invention.

[0026] Figure 6 It is a perspective view of a stirring shaft and a sealing shaft in a rubber molding device of the present invention.

[0027] Figure 7 It is a cross-sectional view of a stirring shaft in a rubber molding device of the present invention.

[0028] Figure 8 It is a cross-sectional view of a cloth cylinder in a rubber molding device of the present invention.

[0029] Figure 9 It is a cross-sectional view of a connecting plate in a rubber molding device of the present invention.

[0030] Figure 10 It is a perspective view of a card slot in a rubber molding device of the present invention.

[0031] Figure 11 It is a perspective view of a material rod in a rubber molding device of the present invention.

[0032] Figure 12 It is a perspective view of a partition in a rubber molding device of the present invention.

[0033] Figure 13 It is a perspective view of a feeding shaft in a rubber molding device of the present invention.

[0034] Wherein: 1. Machine body; 2. Injection tube; 21. Outer tube; 22. Rotating shaft; 221. Sealing shaft; 222. Feeding shaft; 223. Stirring shaft; 23. Partition plate; 24. Screw blade; 25. Heating sleeve; 26. Cloth tube; 261. Arc plate; 262. Connecting plate; 263. Material rod; 27. Plug; 28. Vibration ball; 201. Liquid through hole; 202. Feed inlet; 203. Filter hole; 204. Card slot; 3. Hopper; 4. Molding die. Specific embodiments

[0035] The following will clearly and completely describe the technical solutions in the present invention in combination with the specific embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0036] A rubber molding device of the present invention is an injection molding device for plastic materials such as plastics and rubbers, including a machine body 1, an injection tube 2, a hopper 3, and a molding die 4, which is used for injection processing of rubber raw materials and can also recycle and reprocess rubber.

[0037] The injection tube 2, the hopper 3, and the molding die 4 are all fixedly arranged on the machine body 1. The hopper 3 and the molding die 4 are connected through the injection tube 2. After the rubber raw materials are crushed, they are added into the hopper 3 and are transported to the molding die 4 through the injection tube 2 for injection molding to realize the processing of rubber products.

[0038] The injection tube 2 includes an outer tube 21, a rotating shaft 22, a partition plate 23, a screw blade 24, a heating sleeve 25, a cloth tube 26, a plug 27, and a vibration ball 28. The outer tube 21 is fixedly arranged on the machine body 1. The hopper 3 and the molding die 4 are connected through the outer tube 21. The rotating shaft 22 rotates and slides in the outer tube 21. The screw blade 24 is fixedly arranged on the rotating shaft 22 and abuts against the inner wall of the outer tube 21. The heating sleeve 25 is fixedly arranged on the outside of the outer tube 21. The heating sleeve 25 is a prior art, such as a sleeve with an electric heating rod embedded inside, which can heat and melt the rubber material in the outer tube 21; when the rotating shaft 22 is driven to rotate by a speed reducer, the screw blade 24 is driven to rotate, thereby pushing the material in the outer tube 21, so that the rubber material is heated and melted into a rubber liquid flow while being transported to the molding die 4 for injection molding.

[0039] During the transportation of rubber materials, there will be problems such as incomplete melting of rubber raw materials. When the rubber materials are recycled materials, there will also be impurities in the rubber materials. During the melting process of the rubber materials, there will also be bubbles in the rubber liquid flow. Once the incompletely melted rubber particles, impurities and bubbles enter the molding die 4, they will not only affect the molding quality of the rubber, but also cause damage to the injection molding equipment and reduce the molding efficiency of rubber products.

[0040] The partition plate 23 is fixedly arranged on the rotating shaft 22 and is in sealing contact with the inner wall of the outer tube 21. A liquid through hole 201 is formed in the partition plate 23; as Figure 3 shown, when the rotating shaft 22 rotates, the rubber liquid flow can pass through the liquid through hole 201 under the drive of the spiral blade 24, and the melted rubber particles are isolated on the side of the partition plate 23 away from the molding die 4 until they are completely melted; at the same time, the non-melting impurities are isolated on the side of the partition plate 23 away from the molding die 4 and cannot enter the molding die 4. After passing through the liquid through hole 201, the bubbles will be divided into fine bubbles and float to the liquid surface of the rubber liquid flow to avoid affecting the molding quality of rubber products while being in the rubber liquid flow.

[0041] In order to improve the performance of the liquid through hole 201 in dividing bubbles, it is preferably to set the liquid through hole 201 to an elongated structure such as an 8-shaped or X-shaped structure; in order to avoid the blockage of the partition plate 23 by non-melted rubber particles or impurities, it is preferably to set the partition plate 23 to a conical cylinder structure. The outer diameter of the partition plate 23 gradually increases from the end away from the molding die 4 to the end close to the molding die 4. During the flow of the rubber liquid flow, the non-melted rubber particles can be in contact with the inner wall of the outer tube 21, so that they are more easily melted by the heating sleeve 25.

[0042] The cloth cylinder 26 is fixedly arranged on the side of the partition plate 23 away from the molding die 4. The outer diameter of the cloth cylinder 26 is smaller than the inner diameter of the outer tube 21. The circumferential side of the cloth cylinder 26 is spaced from the inner wall of the outer tube 21, and a plurality of filter holes 203 are formed on the circumferential side of the cloth cylinder 26. The plug 27 is fixedly sealed at the end of the cloth cylinder 26 away from the partition plate 23, and the outer diameter of the plug 27 gradually increases from the end away from the molding die 4 to the end close to the molding die 4; as Figure 4 shown, when the spiral blade 24 drives the rubber liquid flow to flow from right to left, the rubber liquid flow can pass through the filter holes 203 and the liquid through hole 201 and then be injected into the molding die 4, while the non-melted rubber particles in the rubber liquid flow are guided to the outside of the cloth cylinder 26 by the plug 27 until they are completely melted; the arrangement of the cloth cylinder 26 and the plug 27 makes the rubber particles closer to the heating sleeve 25, so that the melting efficiency of the rubber particles can be accelerated and the processing efficiency of rubber products can be improved.

[0043] To ensure the flow efficiency of the rubber liquid, it is preferred to set both the filter holes 203 and the liquid passage holes 201 as multiple; preferably, let the multiple liquid passage holes 201 be located inside the cloth cylinder 26, so as to enhance the filtering effect of the filter holes 203 and the liquid passage holes 201 on the rubber liquid flow.

[0044] As Figure 8 and Figure 9 shown, the cloth cylinder 26 includes multiple arc plates 261, multiple connecting plates 262 and multiple material rods 263. The multiple arc plates 261 are arranged in a circumferential array around the axis of the outer tube 21, and the distance between the circumferential side of the arc plate 261 and the inner wall of the outer tube 21 gradually decreases along the circumferential direction of the rotating shaft 22. The connecting plates 262 and the multiple arc plates 261 are arranged alternately and are fixedly connected. The multiple arc plates 261 and the multiple connecting plates 262 correspond one by one and enclose a cylindrical structure; as Figure 8 shown, when conveying the rubber material, the rotating shaft 22 rotates clockwise, and the distance between the circumferential side of the arc plate 261 and the inner wall of the outer tube 21 gradually increases in the clockwise direction. That is, when the rotating shaft 22 rotates, not only can the unmolten rubber particles be isolated outside the arc plate 261, but also the unmolten rubber particles can be gradually extruded to accelerate the melting efficiency of the rubber particles.

[0045] The material rod 263 is fixedly arranged outside the arc plate 261, and the material rod 263 also corresponds to the arc plate 261 one by one. The distance between the material rod 263 and the inner wall of the outer tube 21 is smaller than the distance between the arc plate 261 and the inner wall of the outer tube 21. The cross-section of the material rod 263 is circular, which can not only better extrude the unmolten rubber particles, but also extrude the unmolten rubber particles into a roll shape to increase the contact area between the unmolten rubber material and the rubber liquid flow and accelerate its melting efficiency.

[0046] The material rod 263 is arranged outside the arc plate 261 and is a protruding structure. When the rotating shaft 22 drives the cloth cylinder 26 to rotate, the material rod 263 can drive some of the unmolten rubber particles to rotate inside the outer tube 21, so as to disperse the unmolten rubber particles and further accelerate the melting efficiency of the rubber particles.

[0047] As Figure 9 and Figure 10 shown, it is preferred to open a card slot 204 on the circumferential side of the material rod 263, and the inner wall of the card slot 204 is flush with the circumferential side of the arc plate 261. As Figure 8 shown, when the rotating shaft 22 rotates clockwise, the unmolten rubber particles can be stuck in the card slot 204, so as to rotate with the cloth cylinder 26, so as to improve the dispersion effect of the cloth cylinder 26 on the rubber particles and accelerate the melting efficiency of the rubber particles.

[0048] A plurality of card slots 204 are evenly distributed along the axial direction of each material rod 263, and the distance between two adjacent card slots 204 is less than half of the pitch of the spiral blade 24. As Figure 10As shown, a plurality of card slots 204 are provided between adjacent two sections of the spiral blade 24, and a plurality of rubber particles are clamped in each card slot 204. Moreover, by means of the clamping of the card slot 204, the rubber particles can be prevented from moving axially along the material rod 263 with the rubber liquid flow, thereby improving the dispersion effect of the rubber particles by the cloth cylinder 26.

[0049] As Figure 9 and Figure 11 shown, the card slots 204 are only provided on one side of the material rod 263. As Figure 8 shown, when the rotating shaft 22 rotates counterclockwise, the unmelted rubber particles on the material rod 263 will slide in a direction away from the forming die 4 under the influence of the rubber liquid flow, so that they can be redispersed and melted when the rotating shaft 22 rotates clockwise, thereby further improving the dispersion effect and melting effect of the rubber particles.

[0050] As Figure 9 shown, one end of the connecting plate 262 close to the axis of the outer tube 21 is arc-shaped and extends out of the inner side of the arc plate 261. The vibrating ball 28 is arranged in the cloth cylinder 26; as Figure 8 shown, when the rotating shaft 22 rotates clockwise, the connecting plate 262 can lift the vibrating ball 28, and after the vibrating ball 28 is lifted to a certain position, it will fall. The falling vibrating ball 28 hammers the arc plate 261, which will cause the arc plate 261 to vibrate, thereby preventing the rubber particles from adhering to the surface of the arc plate 261, achieving the effect of preventing the filter holes 203 from being blocked, and ensuring the smooth flow of the rubber liquid.

[0051] In order to improve the vibration effect of the vibrating ball 28 on the cloth cylinder 26, it is preferably to arrange a plurality of vibrating balls 28.

[0052] The rotating shaft 22 includes a sealing shaft 221, a feeding shaft 222 and a stirring shaft 223. As Figure 2 , Figure 5 and Figure 6 shown, a feeding port 202 is opened on the circumferential side of the outer tube 21. The hopper 3 is communicated with the feeding port 202. The sealing shaft 221 is hermetically arranged at one end of the outer tube 21 far from the forming die 4. The sealing shaft 221 is rotationally and slidably connected with the outer tube 21. The feeding shaft 222 is arranged at one end of the outer tube 21 close to the forming die 4. The outer diameter of the feeding shaft 222 is smaller than the inner diameter of the outer tube 21, and both the feeding shaft 222 and the sealing shaft 221 are coaxially arranged with the outer tube 21. The stirring shaft 223 is fixedly arranged between the sealing shaft 221 and the feeding shaft 222. The feeding port 202 is located at one end of the stirring shaft 223 far from the feeding shaft 222, and the stirring shaft 223 is not coaxially arranged with the outer tube 21; when the reducer drives the sealing shaft 221 to rotate, the stirring shaft 223 rotates around the axis of the outer tube 21 instead of its own axis, thereby stirring the materials in the outer tube 21, which can not only prevent the accumulation of unmelted rubber particles, but also improve the mixing uniformity of various materials.

[0053] To improve the stirring effect of the stirring shaft 223, it is preferable to provide multiple stirring shafts 223. As Figure 5 and Figure 6 shown, one ends of the multiple stirring shafts 223 close to the sealing shaft 221 are flush, and the lengths of the multiple stirring shafts 223 are different, that is, the positions of the multiple stirring shafts 223 close to the feeding shaft 222 are different, which can make the rubber liquid flow form an unstable flow direction to fully stir the rubber liquid flow and disperse the unmelted rubber particles to the outside of the cloth cylinder 26 as soon as possible.

[0054] As Figure 7 shown, the distances from the axes of the multiple stirring shafts 223 to the axis of the outer tube 21 are different, and the distance from the axis of the stirring shaft 223 to the axis of the outer tube 21 is inversely proportional to the outer diameter of the stirring shaft 223, that is, the outer diameter of the stirring shaft 223 closer to the axis of the outer tube 21 is thicker, and the outer diameter of the stirring shaft 223 farther from the axis of the outer tube 21 is thinner; taking the rubber liquid flow in the dotted circle area in Figure 7 as an example, when the rotating shaft 22 rotates counterclockwise, first let the stirring shaft 223 at the lower right corner position stir the rubber liquid flow at the edge of this area, then let the stirring shaft 223 at the lower left position disturb the rubber liquid flow in the middle of this area, and finally let the stirring shaft 223 at the middle position stir the rubber liquid flow at the other edge of this area, and so on, to realize the repeated stirring of the rubber liquid flow in this area; correspondingly, the overall stirring effect of the rubber liquid flow can be improved by increasing the number of the stirring shafts 223.

[0055] As Figure 13 shown, the outer diameter of the feeding shaft 222 close to one end of the forming die 4 is larger than the outer diameter of its end far from the forming die 4, so that the rubber liquid flow can stably flow into the forming die 4 to ensure the forming quality of the rubber product.

[0056] The using method of a rubber forming device of the present invention is as follows:

[0057] S1. Heat the heating sleeve 25 to raise the temperature of the outer tube 21 to 160 - 220 °C so that the rubber raw material in the outer tube 21 can be melted; let the recycled rubber raw material or the new material configured according to production requirements be added to the hopper 3 for storage after being crushed, washed and dried.

[0058] S2. First, use the reducer to drive the rotating shaft 22 to rotate forward, so that the rotating shaft 22 drives the spiral blade 24 to rotate, so that the materials in the hopper 3 enter and fill the outer tube 21, and then drive the rotating shaft 22 to slide in the direction close to the forming die 4, and inject the rubber liquid flow into the forming die 4 with a certain pressure and speed; during this process, the rubber raw material is melted into a rubber liquid flow, thereby realizing the thermoplastic forming of the rubber product.

[0059] S3. After the rubber liquid flow is injected into the molding die 4, maintain a certain pressure for a period of time to perform pressure holding and cooling on the rubber raw material in the molding die 4, so as to supplement the volume change of the rubber during the cooling and shrinkage process, and ensure the dimensional accuracy and density of the rubber product.

[0060] S4. Use a speed reducer to drive the rotating shaft 22 to rotate in the reverse direction, and simultaneously drive the rotating shaft 22 to slide in a direction away from the molding die 4 to reset the rotating shaft 22. When the rotating shaft 22 rotates in the reverse direction, the unmolten rubber raw material outside the cloth cylinder 26 and the vibrating balls 28 in the cloth cylinder 26 are driven by the spiral blades 24 to move to one end of the cloth cylinder 26 away from the molding die 4, so that the unmolten rubber particles and the vibrating balls 28 are also reset, in order to perform continuous processing of the rubber product.

[0061] S5. Open the molding die 4, take out the rubber product, and perform treatments such as removing flash and inspection on the rubber product.

[0062] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rubber molding device, characterized in that: It comprises a machine body (1), an injection tube (2), a hopper (3) and a forming die (4), wherein: The injection tube (2) comprises an outer tube (21), a rotating shaft (22), a partition (23), a spiral blade (24) and a heating sleeve (25); the outer tube (21) is fixedly arranged on the machine body (1); the rotating shaft (22) is rotatably and slidably arranged in the outer tube (21); the partition (23) is fixedly arranged on the rotating shaft (22) and is in sealing contact with the inner wall of the outer tube (21); a liquid passage hole (201) is provided in the partition (23); the spiral blade (24) is fixedly arranged on the rotating shaft (22) and is in contact with the inner wall of the outer tube (21); the heating sleeve (25) is fixedly arranged on the outer side of the outer tube (21); The hopper (3) and the forming die (4) are both fixedly arranged on the machine body (1), and the two are connected via the outer tube (21).

2. A rubber molding device as claimed in claim 1, characterized in that: The rotating shaft (22) comprises a sealing shaft (221), a feeding shaft (222) and a stirring shaft (223), wherein: The sealing shaft (221) is sealingly disposed in the outer tube (21) at one end away from the forming die (4), and is rotatably and slidably connected to the outer tube (21); The feeding shaft (222) is arranged at one end of the outer tube (21) close to the forming die (4), and its outer diameter is smaller than the inner diameter of the outer tube (21), and the feeding shaft (222) and the sealing shaft (221) are both coaxially arranged with the outer tube (21); The stirring shaft (223) is fixedly arranged between the sealing shaft (221) and the feeding shaft (222), and the stirring shaft (223) and the outer tube (21) are not arranged coaxially; A feed port (202) is provided on the circumferential side of the outer tube (21), the hopper (3) is connected to the feed port (202), and the feed port (202) is located at an end of the stirring shaft (223) away from the feeding shaft (222).

3. A rubber molding device as claimed in claim 2, characterized in that: A plurality of stirring shafts (223) are provided, and the distances between the axes of the plurality of stirring shafts (223) and the axis of the outer tube (21) are different; The ends of the plurality of stirring shafts (223) close to the sealing shaft (221) are flush with each other, and the plurality of stirring shafts (223) have different lengths.

4. A rubber molding device as claimed in claim 3, characterized in that: The distance from the axis of the stirring shaft (223) to the axis of the outer tube (21) is inversely proportional to the outer diameter of the stirring shaft (223).

5. A rubber molding device as claimed in claim 1, characterized in that: The injection tube (2) further comprises a material dispensing tube (26) and a plug (27), wherein: The material distributing tube (26) is fixedly arranged on a side of the partition plate (23) away from the forming die (4), has an outer diameter smaller than an inner diameter of the outer tube (21), and has filtering holes (203) formed on its circumference; The plug (27) is sealingly fixed to an end of the material distributing tube (26) away from the partition (23), and the outer diameter of the plug (27) gradually increases along the direction from the end away from the forming die (4) to the end close to the forming die (4).

6. A rubber molding device as claimed in claim 5, characterized in that: The material distributing cylinder (26) comprises a plurality of arc plates (261) and a plurality of connecting plates (262), wherein: A plurality of the arc plates (261) are arranged in a circular array around the axis of the outer tube (21), and the distance between the circumferential side of the arc plates (261) and the inner wall of the outer tube (21) gradually decreases along the circumferential direction of the rotating shaft (22); The connecting plate (262) and the plurality of arc plates (261) are arranged alternately, and the two are fixedly connected to enclose a cylindrical structure.

7. A rubber molding device as claimed in claim 6, characterized in that: The material distributing cylinder (26) further comprises a plurality of material rods (263), wherein the material rods (263) are fixedly arranged on the arc plate (261) and correspond one to one thereto, and the distance between the material rods (263) and the inner wall of the outer tube (21) is smaller than the distance between the arc plate (261) and the inner wall of the outer tube (21); A plurality of slots (204) are evenly distributed along the axial direction on the circumferential side of the material rod (263); the inner walls of the slots (204) are flush with the circumferential side of the arc plate (261); and the distance between two adjacent slots (204) is less than half the pitch of the spiral blade (24).

8. A rubber molding device as claimed in claim 7, characterized in that: The injection tube (2) further comprises a plurality of vibration balls (28), wherein the vibration balls (28) are arranged in the material dispensing tube (26); One end of the connecting plate (262) close to the axis of the outer tube (21) is in an arc shape and extends out of the inner side of the arc plate (261).

9. A rubber molding device as claimed in claim 2, characterized in that: The outer diameter of the end of the feeding shaft (222) close to the forming die (4) is greater than the outer diameter of the end of the feeding shaft (222) away from the forming die (4).

10. A method for using the rubber molding device as claimed in claim 8, characterized in that: The following steps are involved: S1, heating the heating jacket (25) and adding the recycled rubber raw material into the hopper (3); S2, first using a speed reducer to drive the rotating shaft (22) to rotate in a positive direction, and then driving the rotating shaft (22) to slide in a direction close to the molding die (4), so as to melt the rubber raw material and convey it into the molding die (4); S3, maintaining pressure and cooling the rubber raw material in the molding die (4); S4, using a speed reducer to drive the rotating shaft (22) to rotate in the opposite direction, and simultaneously driving the rotating shaft (22) to slide in a direction away from the forming die (4), so as to move the unmelted rubber raw material on the outside of the distributing cylinder (26) and the vibrating ball (28) in the distributing cylinder (26) to an end of the distributing cylinder (26) away from the forming die (4); S5, opening the molding die (4) and taking out the rubber product.

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