Natural rubber drying system and process

Abstract

The invention discloses a natural rubber drying system and process, and belongs to the technical field of natural rubber drying. The system comprises a tunnel type drying kiln, a briquetting device, a curing cabinet, an automatic weighing / weight supplementing integrated device and a packaging device. The process comprises the steps of drying, curing, green spot detection, automatic weighing / weight supplementing, briquetting and the like. Natural rubber is dried through a gradual tunnel drying kiln, dried rubber blocks are placed in a curing cabinet to be cured, the cured rubber blocks are placed on a detecting and weighing disc, each area is divided into a plurality of rubber positions, the rubber blocks are subjected to weight measurement and weight matching after green points are removed, the unmatched rubber blocks are cut into small rubber blocks, and the small rubber blocks are placed on the detecting and weighing disc. After the two large rubber blocks and the small rubber block reach the weight index, briquetting and packaging are performed; the automatic weighing / weight supplementing integrated device is divided into an upper layer, a middle layer and a lower layer which are respectively used for tool placement, weighing matching and rubber block collection. According to the invention, the overall production capacity of natural rubber drying processing is improved, and the drying energy consumption is reduced.

Description

Technical Field

[0001] The present invention relates to a natural rubber drying system and process, and particularly to a system and process for drying natural rubber through a progressive tunnel drying kiln, curing through a curing cabinet, and then automatically weighing and packaging it, belonging to the technical field of natural rubber drying technology. Background Art

[0002] As an important strategic material and industrial raw material, natural rubber has excellent properties such as elasticity, flexibility, wear resistance, and insulation, and is widely used in tire manufacturing, mechanical parts, medical supplies and other fields. Typical primary processing processes of natural rubber include raw material collection, crushing, cleaning and impurity removal, mixing, homogenization, dehydration and creping, granulation, loading, drying, weighing, briquetting, testing, packaging, boxing and other processes.

[0003] Among them, drying is a key link in the primary processing of natural rubber. The existing tunnel hot air drying kiln in the industry is an essential equipment and facility for most primary processing plants at home and abroad, with high energy consumption and low automation. During on-site inspections of enterprises, it was found that the drying stage actually covers two tasks. One is to reduce the moisture content of natural rubber to less than 0.8%, and the other is to cure natural rubber. Taking some rubber factories of Yunnan Natural Rubber Group in Xishuangbanna Prefecture as an example, it was found that for almost all miscellaneous rubbers, according to the existing drying process conditions, it only takes 100 - 120 minutes to reduce the moisture content to the standard value, while natural rubber has to stay in the rubber truck in the drying kiln for more than 300 minutes to complete all curing, that is, to eliminate the vast majority of "uncooked spots" to meet the factory standards required by downstream customers. Previously, the rubber sources of natural rubber mainly came from state-owned farms, and the quality of rubber sources and the previous processing methods were relatively consistent. Whole latex accounted for the vast majority of the market. Ammonia was added before rubber collection to prevent coagulation, and acid was added again after collection to make it coagulate. Until recent years, the providers of natural rubber raw materials were mainly private farmers, and natural rubber sources containing various impurities such as bowl bottom rubber and forest land rubber became the mainstream. This method is natural coagulation, and after primary processing, it has better physical and chemical and mechanical properties. However, the gradually dominant miscellaneous rubber is prone to the problem of "being undercooked (uncooked spots)" during the drying process, and each rubber truck needs to stay in the drying tunnel for an extra three to five minutes to ensure that the "uncooked spot" problem is solved.

[0004] If only the drying temperature condition is reduced (e.g., from 125 °C to 115 °C) to reduce energy consumption, the time required for complete ripening will be longer and the production capacity will be reduced. To increase the production capacity, only a higher drying temperature can be maintained. The most direct impact of a long-term higher drying temperature is a significant increase in energy consumption, and the indirect impact is that the product quality is also average, resulting in a lower selling price. The economic value per ton of rubber is lower than that of natural rubber dried by small-scale low-temperature workshops in some Southeast Asian countries. This phenomenon is universal, and many current domestic natural rubber production enterprises are almost troubled by the "impossible triangle" composed of "production capacity", "cost (energy consumption)", and "quality". Previously, the inventor found that improving the combination of drying temperature and humidity process conditions can solve the "green spot" problem to a certain extent (CN119492249A), but this requires a major transformation of the tunnel-type hot air drying cabinet, and it is not easy to promote and implement.

[0005] In addition, there is also a problem that the weighing, briquetting, and packaging processes in the primary processing almost completely rely on manual labor. At the last station of the drying process, natural wind is required to cool the hot rubber. When it reaches 50 °C, it is transported to the weighing station by a conveyor belt. If the weight exceeds the standard range after weighing, workers need to add pre-prepared dried rubber blocks. If the weighing shows overweight or overweight after adding, workers need to repeatedly cut and reduce or replenish the material until the weight reaches the qualified range before briquetting and packaging. This process requires multiple skilled workers to operate simultaneously, which not only brings high labor costs but also becomes a bottleneck in increasing production capacity.

[0006] CN119492249A discloses a natural rubber drying process and device with pretreatment. The device includes a tunnel-type hot air drying cabinet with several rubber car positions. The frontmost position of the tunnel is the preheating section, followed by a closed section, and all the subsequent positions are continuous drying sections. Upper air ducts and lower air ducts are respectively provided above and below the positions in the tunnel. Partitions are provided on the air ducts at intervals of some positions, and air inlets and air outlets are alternately provided on the air ducts between adjacent partitions. However, it still cannot solve the problem that the above-mentioned enterprises are trapped in the "impossible triangle" composed of "production capacity", "cost (energy consumption)", and "quality".

[0007] Therefore, the multi-dimensional optimization of "production capacity", "cost (energy consumption and labor)", and "quality" for natural rubber primary processing enterprises has become an urgent problem to be solved, and there is room for improvement in the processes from drying to packaging. Summary of the Invention

[0008] The present invention mainly aims at the deficiencies in drying processing and quantitative packaging in CN119492249A, and provides a natural rubber drying system and process to achieve multiple purposes such as improving the overall production capacity of natural rubber drying processing, reducing drying energy consumption, accelerating the packaging rhythm, reducing labor costs, and improving the quality of rubber when leaving the factory.

[0009] The present invention decomposes the two functions of "drying - curing" in the traditional drying and processing link in terms of time and space dimensions. Only the function of reducing the moisture content is realized in the existing tunnel - type drying kiln, and the rubber with qualified moisture content but still in a large amount of under - cooked state is sent to another space curing cabinet. The curing cabinet exchanges space for time and provides a relatively large space for the rubber to be slowly cured. The curing cabinet has a buffering effect. Therefore, as long as a certain amount of rubber is stored inside, the overall initial processing speed will not be affected. At the same time, the functions of automatic weighing and feeding are also integrated in the curing cabinet, and after coming out of the curing cabinet, it can be directly pressed into blocks and packaged.

[0010] The specific technical solution disclosed by the present invention is as follows: A natural rubber drying process, the process of which includes: (1) Drying and curing: The natural rubber particles after creping and granulation are loaded onto the rubber trucks one by one into the rubber truck unit. The rubber trucks enter the tunnel - type hot - air drying kiln in sequence. Each rubber truck continuously and slowly moves towards the exit. After reaching the preset drying time, it exits the drying kiln, and a new rubber truck enters the drying kiln from the entrance; the exiting rubber truck is transported to one side for the removal of the four - week enclosures. The rubber truck with only the bottom support plate and rollers forms high - frequency and low - amplitude vibration under the push of the bottom vibration device. Then, the rubber blocks are grabbed one by one by the robotic arm and transported to the curing cabinet for stacking; each rubber block stays in the medium - temperature curing cabinet for enough time to wait for the under - cooked rubber to be completely cooked. The rubber blocks from the same rubber source stay in the curing cabinet for the same time. (2) Detection of raw spots: When a batch of rubber curing is completed, the batch of rubber is unstacked onto the conveyor belt and transported to the detection and weighing disc. Each rubber block occupies a rubber position on the periphery of the disc. The number of rubber positions is odd, and each rubber position corresponds to a number. Machine vision is used to identify whether there are still significant raw spots. If there are a small number of raw spots, they are removed by machine or manually. If the number of raw spots is significantly large, it re - enters the curing cabinet from the second curing cabinet inlet through the connecting conveyor belt II and is stacked and sent back to the furnace for a period of time. (3)Automatic weighing, weight compensation, and briquetting packaging: The weighing sensors under the trays at the gluing positions on the disc transmit the weight of each rubber block to the host computer in real time. The host computer calculates the sum of the weights of every two rubber blocks through a program, and uses an optimization algorithm to ensure that the number of groups with equal sums of the weights of every two rubber blocks is as large as possible. It determines which two numbered rubber blocks are combined, and selects the rubber block that is least suitable for combination with other rubber blocks as the weight-compensating rubber block; the weight-compensating rubber block is cut into small rubber blocks of several different weights by a mechanical knife, and the small rubber blocks are placed on the central area gluing positions of the detection and weighing disc. After being detected by the weight sensors in the same way, they are matched to two large rubber blocks that need to make up the packaging weight; the two large rubber blocks with the matched weight and a small weight-compensating rubber block are simultaneously dropped into the briquetting frame, briquetted and then packaged to complete the process; the rubber blocks that do not have a suitable matched weight in the first round are transported to the middle area of the detection and weighing disc, that is, the secondary matching waiting area. New batches of rubber blocks are supplemented into the outer ring of the disc. At this time, the weights of the rubber blocks waiting for secondary matching and the rubber blocks waiting for primary matching in the outer area are transmitted to the host computer again, and the total weight matching calculation is carried out again for two large rubber blocks and a small weight-compensating rubber block. The two large and one small rubber blocks with the total weight within the allowable weight range are dropped into the briquetting frame and transported to the briquetting device for briquetting and packaging; when the number of small rubber blocks is less than a certain value, large rubber blocks are selected again for cutting and supplementing, and the unmatched small rubber blocks are moved to the trays in the middle area for temporary storage; if there are still unmatched large rubber blocks after multiple cycles, they are preferentially selected as weight-compensating rubber blocks for cutting. For the rubber blocks that still cannot find a suitable matching combination, they re-enter the curing cabinet for temporary storage from the conveyor belt II and the curing cabinet inlet II as the detection and weighing disc rotates, and their positions and weights are marked. Once other rubber blocks with suitable weights are matched for them in the database, they will again move from the curing cabinet to the trays in the outer area of the detection and weighing disc. The rubber block is controlled to fall into the conical cylinder together with other paired rubber blocks, and is transported to the briquetting device through the briquetting frame to complete the briquetting and packaging. The large rubber blocks that cannot be matched after multiple rounds can also not return to the curing cabinet, but are combined with another large rubber block waiting for matching and small rubber blocks to form a rubber group that is close to but less than the allowable weight and enter the briquetting frame. The weight is supplemented by micro rubber blocks with a weight of grams on the way when the briquetting frame is transported to the briquetting device.

[0011] The present invention also provides a natural rubber drying system, which includes a tunnel drying kiln, a briquetting and packaging device, and also includes a curing cabinet and an automatic weighing / weight compensation integrated device between the drying kiln production unit and the briquetting device.

[0012] The aging cabinet is a hollow space with two inlets and one outlet. It has an intermediate channel inside, and there are multiple layers of rubber block racks for placing rubber blocks on both sides. Each layer of the rubber block rack has a tray sized to fit the rubber block. There is a weighing sensor at the bottom of the tray, and there is also a bracket for controlling its parallel and vertical movement. The aging cabinet is surrounded by a heat-insulating layer. There is a hot air inlet at the bottom on one side of the aging cabinet, and multiple temperature sensors are dispersed at different positions according to the space size inside. The hot air volume is controlled according to the average temperature to make the internal temperature reach the aging temperature.

[0013] The automatic weighing / weight compensation integrated device is divided into three coaxial upper, middle and lower layers. It can be independently rotated in layers through its respective support columns under the action of a driving device. Its top layer is a ring-shaped bracket with two circles for installing tools. Its middle layer is a detection weighing disc, and its bottom layer is a conical cylinder with a large inclination angle.

[0014] The detection weighing disc in the middle layer of the automatic weighing / weight compensation integrated device is divided into three areas: the periphery, the middle and the center. The periphery area is divided into an odd number of rubber block positions for placing single rubber blocks. Each rubber block position is an adjustable tray. The length and width dimensions of the tray are larger than those of the rubber block. There is a weighing sensor at the bottom of the tray, and there is also a telescopic support frame that can be connected to hydraulic drive. In the normal state, the adjustable tray is completely flush with the disc. In the transportation state, the tray is slightly higher than the disc. The telescopic support frame drives the tray to translate towards the center of the disc along the gap. In the sinking state, the tray droops in the plumb direction to let the rubber block freely fall to the next layer; the middle area is a secondary matching waiting area, and there is also a circle of adjustable trays arranged. The size of the tray is also one size larger than that of the rubber block, and it can also present the normal state, the transportation state and the sinking state; the center area is the cutting area for compensating rubber blocks, and it is also divided into several fan-shaped area positions. Adjustable trays are also arranged on the fan-shaped area positions for placing small rubber blocks. The size of the tray is one size larger than the size of the largest cut block in the normal situation.

[0015] The top layer of the automatic weighing / weight compensation integrated device is a ring-shaped bracket with two circles for installing tools. The outer ring-shaped bracket is suspended directly above the outer area of the middle layer disc. Its support column can drive the ring-shaped bracket to rotate forward and backward. Multiple high-definition cameras are dispersed at multiple angles on the ring-shaped bracket, and photos and videos can be transmitted to the upper computer for visual recognition of "birth points"; there is also a spiked cutter that can move up and down at one place on the outer ring-shaped bracket, which is used to remove the obvious birth points of the rubber block detected by the high-definition camera. When the camera recognizes the surface birth point, it immediately reports its position coordinates to the upper computer. The upper computer issues the position of the ring-shaped bracket rotation. After rotating in place, the spiked cutter moves down to the position of the rubber block birth point to remove the birth point. After the operation, the spiked cutter retracts and returns to its position; the inner ring-shaped bracket is suspended directly above the center area of the middle layer disc, and a tool set for cutting rubber blocks is placed on the ring-shaped bracket.

[0016] The bottom layer of the automatic weighing / supplementing integrated device is a conical cylinder with a large inclination angle. The upper end has a large caliber equal to the outermost dimension of the detection weighing disc, and the bottom opening is directly connected to a pressing block frame. After the pressing block frame receives a sufficient number of rubber blocks of the full weight, it is transferred to a nearby position for pressing, and then moved back to the original position after completion.

[0017] There are two connecting conveyor belts between the automatic weighing / supplementing integrated device and the curing cabinet. Connecting conveyor belt Ⅰ connects the outlet of the curing cabinet and the detection weighing disc, and is used to transport the rubber blocks in the curing cabinet to the outer area of the detection weighing disc. Connecting conveyor belt Ⅱ connects the detection weighing disc and the inlet Ⅱ of the curing cabinet, and is used to move the large rubber blocks that cannot be matched multiple times back to the outer area and then transport them back to the curing cabinet.

[0018] The natural rubber drying and curing system includes a set of upper computer hardware and program software. The functions implemented by the program software include wireless sensing signal acquisition, transmission, display and recording of the temperature in the curing cabinet and the weight data of the rubber blocks on each tray, weight calculation and matching of the rubber block weight data, real-time picture upload and visual recognition of the camera, mapping of the raw point position and transmission of the positioning coordinates, setting and control of the rotation direction and speed of the disc and the ring bracket.

[0019] The natural rubber drying and curing system also includes a PLC controller signal-connected to the upper computer, and is connected to the hydraulic device through the PLC controller to control the grasping, moving and dropping of the robotic arm.

[0020] The present invention has the following advantages compared with the prior art: The present invention decomposes the drying and curing process of the traditional hot air drying kiln into a continuous process in two spaces, so that the two links of "drying" and "roasting" are carried out in the hot air drying kiln and the curing cabinet respectively. The time of each rubber cart in the hot air drying kiln is shortened from 5 hours to 2 hours. Although it still takes 3 - 6 hours in the curing cabinet, the storage space of the curing cabinet exchanges for the processing time and does not affect the production rate of the overall production line. In addition, after the intelligent transformation of the original manual weighing / supplementing link, it can work continuously during the break time of the workers and can also cure at night when there is no production originally, further improving the production capacity. It is estimated that the initial processing capacity of the new system for miscellaneous rubber can be increased to 1.5 - 2.5 times of the original; Due to the spatial separation of the drying kiln and the curing cabinet, the temperature for dehydration drying can be appropriately reduced. Therefore, the environment where the natural rubber is located is reduced from the original long time (6 hours) high temperature (125°C) to a short time (2 hours) sub-high temperature (115°C). And the long-term high temperature is the main reason for the deterioration of the quality of natural rubber. Therefore, the present invention can improve the quality of natural rubber, especially miscellaneous rubber, and enable the initial processing manufacturers to have greater market bargaining power; Due to the spatial separation of the drying kiln and the aging cabinet, in the original process and system, when natural rubber exits the drying kiln, a large amount of natural wind is required to cool the natural rubber. However, in the new process and system of the present invention, it is not necessary to cool the rubber when it exits the drying kiln. Instead, it enters the aging cabinet while maintaining its high temperature state. The environmental temperature required inside the aging cabinet mainly relies on the residual heat of the rubber blocks themselves, and only a small amount of additional heat energy is needed to maintain a temperature of 60 - 90°C. In addition, the temperature drop and time shortening of the drying kiln have significantly reduced the energy consumption in the drying and aging process. The automatic weighing / supplementary weighing process adopted by the present invention replaces manual operation. Based on the material characteristics of rubber, the porosity inside each rubber block is different, making it difficult to accurately judge the weight of the rubber block directly according to volume. Moreover, cutting is a very time-consuming and laborious process. By adopting supplementary weighing instead of weight reduction, and combining real-time data acquisition, transmission, and matching algorithms, intelligent production of this process can be achieved, reducing the completion time of this process and helping to improve production capacity. Brief Description of the Drawings

[0021] Figure 1 It is a schematic flow chart of the process of the present invention.

[0022] Figure 2 It is a schematic structural diagram of the system of the present invention.

[0023] Figure 3 It is a top view of the system structure of the present invention.

[0024] Figure 4 It is a schematic structural diagram of the aging cabinet in the system of the present invention.

[0025] Figure 5 It is a cross-sectional view of the aging cabinet in the system of the invention.

[0026] Figure 6 It is a schematic plan view of the automatic weighing / supplementary weighing integrated device in the system of the present invention.

[0027] In the figure: 1 - drying kiln; 2 - briquetting device; 3 - packaging device; 4 - aging cabinet; 5 - automatic weighing / supplementary weighing integrated device; 6 - inlet Ⅰ; 7 - inlet Ⅱ; 8 - outlet; 9 - intermediate channel; 10 - rubber placement rack; 11 - tray; 12 - weighing sensor; 13 - support; 14 - thermal insulation layer; 15 - hot air inlet; 16 - temperature sensor; 17 - driving device; 18 - detection and weighing disc; 19 - peripheral area; 20 - central area; 21 - central zone; 22 - adjustable tray; 23 - telescopic support frame; 24 - outer ring annular support; 25 - high-definition camera; 26 - upper computer; 27 - spike cutter; 28 - inner ring annular support; 29 - tool set; 30 - small retaining cylinder; 31 - conical cylinder; 32 - briquetting frame; 33 - connecting conveyor belt Ⅰ; 34 - connecting conveyor belt Ⅱ; 35 - PLC controller; 36 - micro-rubber block supplementary weighing box; 37 - vibration device. Detailed implementation mode

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, but the protection scope of the present invention is not limited to the content described above. Embodiment 1

[0029] A natural rubber drying process, as shown in Figures 1 to 6 shown, its process includes: rubber particles after preliminary crushing, soaking, squeezing and washing, creping, tearing and granulating are loaded into the rubber truck unit one by one. The rubber trucks enter the tunnel-type hot air drying kiln in turn. The rubber trucks continue to move slowly towards the exit. One rubber truck exits the drying kiln at the exit every 2 - 3.5 minutes, and a new rubber truck enters the drying kiln from the entrance. The time of each rubber truck in the drying kiln is 1.5 - 2.5 hours; The exiting rubber trucks are transported to one side for the removal of the surrounding enclosures. The rubber trucks with only the bottom support plate and rollers form high-frequency and low-amplitude vibrations under the push of the bottom vibration device. Then, the robotic arm is controlled to grab the rubber blocks and transport them one by one to the curing cabinet for stacking; each rubber block is left standing in the curing cabinet at a temperature of 60 - 90 °C for 4 - 6 hours to wait for the undercooked rubber to become fully cooked. The standing time of the rubber blocks from the same rubber source in the curing cabinet is the same; At the end of the curing of a batch of rubber, the rubber is unstacked and transported to the conveyor belt one by one, and then transferred to the detection and weighing disc. Each rubber block occupies a rubber position on the periphery of the disc. The number of rubber positions is odd, and each rubber position corresponds to a number. Machine vision is used to identify whether there are still significant uncooked spots on the appearance. If the number of uncooked spots with a particle size greater than 3 mm is 1 - 3, they are removed by the machine-positioned cutter or manually. If the number of uncooked spots with a particle size greater than 3 mm is more than 3, they are re-entered into the temporary storage area of the curing cabinet from the second curing cabinet inlet through the connecting conveyor belt II, stacked and sent back to the furnace for 1 - 2 hours; The weighing sensors under the trays on the disc rubber positions transmit the weight of each rubber block to the upper computer in real time. The upper computer calculates the sum of the weights of every two rubber blocks through a program, and adopts a matching optimization algorithm to ensure that the number of groups with equal sums of the weights of two rubber blocks is as large as possible, determines which two numbered rubber blocks are combined, and selects the one rubber block that is least suitable for combination with other rubber blocks as the weight-compensating rubber block; The weight-compensating rubber block is cut twice by a cutter into 16 small rubber blocks with different weights. The small rubber blocks are placed on the 16-grid trays in the inner circle center area of the detection and weighing disc. After being detected by the weight sensor in the same way, they are matched to two large rubber blocks that need to complete the packaging weight; the two large rubber blocks with the matched weight and a weight-compensating small rubber block are simultaneously dropped into the pressing frame, pressed and packaged to complete the process; The rubber blocks without a suitable matching weight in the first round are transported to the middle area of the detection and weighing disc, that is, the secondary matching waiting area. The outer area of the disc is replenished with rubber blocks of the next batch. At this time, the weights of the rubber blocks to be secondarily matched and the rubber blocks to be primarily matched in the outer area are transmitted to the host computer, and the total weight matching calculation is performed again for two large rubber blocks and a small supplementary weight rubber block. The two large and one small rubber blocks with the total weight within the allowable weight range are dropped into the pressing frame for pressing and packaging. When the number of small rubber blocks is less than 1 / 3 of the set total supplementary weight rubber block number, large rubber blocks are selected again for cutting and supplementing, and the unmatched small rubber blocks are moved to the middle area tray for temporary storage; if there are still no matching large rubber blocks after multiple cycles, they are preferentially selected as supplementary weight rubber blocks for cutting. For the rubber blocks that still cannot find a suitable matching combination, they are moved back to the empty tray in the outer area of the detection and weighing disc, and enter the curing cabinet for temporary storage again from conveyor belt II and the inlet II of the curing cabinet as the disc rotates, and their positions and weights are marked. Once other rubber blocks with a suitable weight are matched for them in the database, they are again on the outer area tray of the detection and weighing disc from the curing cabinet, and the rubber block is controlled to fall into the conical cylinder together with other paired rubber blocks, and is transported to the pressing device through the pressing frame to complete pressing and packaging and complete the process.

[0030] Preferably, the temperature inside the tunnel hot air drying kiln is 115 °C and the drying time is 2 hours.

[0031] Preferably, the ambient temperature in the curing cabinet is 80 °C and the curing time is 5 hours. Example 2

[0032] A natural rubber drying process is the same as the drying and curing processes of Example 1, and also has the same process as Example 1 to complete the supplementary weight of two rubber blocks that can be matched in the first round. The difference is that the rubber blocks without a suitable matching weight in the first round do not need to be transported to the middle area of the detection and weighing disc. Instead, after two large rubber blocks are matched with the supplementary weight small rubber block that is closest but does not reach the allowable weight, they are directly dropped into the pressing frame, and several pre-set gram-level supplementary weight micro rubber blocks are added on the way of transporting the pressing frame to the pressing device to reach the required weight range. Example 3

[0033] A natural rubber drying system, as Figure 2 shown, includes a tunnel drying kiln 1, a pressing device 2 and a packaging device 3. There is also a curing cabinet 4 and an automatic weighing / supplementary weight integrated device 5 between the production unit of the drying kiln 1 and the pressing device 2.

[0034] As Figure 4 and Figure 5As shown in the figure, the aging cabinet 4 is a hollow space provided with an inlet I 6, an inlet II 7 and an outlet 8. There is an intermediate channel 9 in the hollow space, and there are multiple layers of rubber block placement racks 10 for placing rubber blocks on both sides. It is divided into an aging area and a temporary storage area. There are trays 11 sized to fit the rubber blocks on each layer of the rubber block placement rack 10. There are weighing sensors 12 at the bottom of the trays 11, and there is also a support 13 for controlling its parallel movement and vertical movement. The periphery of the aging cabinet is covered with a heat insulation layer 14. There is a hot air inlet 15 provided at the bottom of one side of the aging cabinet. Multiple temperature sensors 16 are dispersedly arranged at different positions inside according to the space size. The hot air volume is controlled according to the average temperature to make the internal temperature reach the aging temperature.

[0035] As Figure 6 shown in the figure, the automatic weighing / weight compensation integrated device 5 is divided into three coaxial upper, middle and lower layers, and can be independently rotated in layers through their respective support columns under the action of the driving device 17. Its uppermost layer is a ring-shaped bracket with two circles for installing tools. Its middle layer is a detection weighing disc 18, and its lowermost layer is a conical cylinder 31 with a large inclination angle.

[0036] As Figure 6 shown in the figure, the detection weighing disc 18 is divided into three areas: an outer area 19, a middle area 20 and a central area 21. The outer area 19 is divided into an odd number of rubber block positions for placing single rubber blocks. Each rubber block position is an adjustable tray 22. The adjustable tray 22 is a rectangular plate connected to the hollow solid skeleton of the detection weighing disc 18, with a gap around it, and its length and width are larger than the rubber block. It is connected to the mother board of the detection weighing disc 18 with a hinge in the width direction. There is also a weighing sensor 12 at the bottom of each adjustable tray 22, and there is also a telescopic support 23. In the normal state, the adjustable tray 22 is flush with the detection weighing disc 18. In the transportation state, the adjustable tray 22 is slightly higher than the detection weighing disc 18. The telescopic support 23 drives the tray to translate towards the center of the disc along the gap. In the sinking state, the telescopic support 23 completely contracts, and the adjustable tray 22 droops to the vertical direction to let the rubber block freely fall to the next layer; the middle area 20 is a secondary matching waiting area, and a circle of adjustable trays 22 is also arranged, and its size is also one circle larger than the rubber block, and it can also present the normal state, the transportation state and the sinking state; the central area 21 is the cutting area for the weight compensation rubber blocks, and it is also divided into 16 square area positions. Adjustable trays are also arranged on the positions in the central area 21 for placing small rubber blocks, and the size of the adjustable tray is one circle larger than the size of the largest cut block in the normal situation; As Figure 6As shown, the top layer of the automatic weighing / supplementing integrated device 5 is a ring-shaped bracket for mounting tools in two circles. The outer ring-shaped bracket 24 is suspended directly above the outer peripheral area 19 of the middle-layer disc. Its support columns can drive the outer ring-shaped bracket 24 to rotate forward and backward. Multiple high-definition cameras 25 are dispersedly arranged on the ring-shaped bracket from multiple angles, and can transmit photos and videos to the host computer 26 for visual recognition of "production points"; there is also a spike cutter 27 that can move up and down at one place on the outer ring-shaped bracket 24, which is used to remove the significant production points detected by the high-definition camera on the rubber block. When the high-definition camera 25 recognizes the particle size and number of surface production points and makes a judgment, when the number of production points larger than 3 mm does not exceed 3, the position coordinates of the production points are immediately reported to the host computer 27. The host computer issues the position for the ring-shaped bracket to rotate. After rotating in place, the spike cutter 27 is moved downward to the position of the production point on the rubber block to remove the production point. After completion, the spike cutter retracts and returns to its original position; when the particle size of the production point is less than 3 mm, it can be ignored; when the number of production points larger than 3 mm exceeds 3, they re-enter the curing cabinet from the inlet II of the curing cabinet through the connecting conveyor belt II, and after palletizing, they are returned to the furnace for 1 to 2 hours; the inner ring-shaped bracket 28 is suspended above the central area 21 of the middle-layer detection and weighing disc 18. A tool set 29 for cutting rubber blocks is placed on the ring-shaped bracket. The tool set 29 includes 3 parallel blades that can rotate in orientation and adjust the blade spacing, which is used to cut the supplementing rubber blocks. When the tool set 29 descends to the upper surface of the rubber block, the small retaining cylinder 30 preset on the rubber block tray in the central area 21 extends 5 to 10 mm, and the position of the rubber block can be fixed within the area of the small retaining cylinder 30. The tool first cuts once along the width direction of the rubber block, and then rotates 90° and cuts once along the length direction. The blade spacing can be roughly adjusted according to the required weight of the small rubber blocks to be matched, and the supplementing rubber block is cut into 16 small rubber blocks of different weights; As Figure 6 shown, the bottom layer of the automatic weighing / supplementing integrated device 5 is a conical cylinder 31 with a large inclination angle. Its upper large diameter is equal to the outermost dimension of the detection and weighing disc. The bottom opening is directly connected to a pressing block frame 32. After the pressing block frame 32 receives a sufficient number of rubber blocks of the right weight, it is transferred to the adjacent pressing device 2 for pressing, and then returns to its original position after completion.

[0037] As Figure 2 and Figure 6 shown, there are two connecting conveyor belts between the automatic weighing / supplementing integrated device 5 and the curing cabinet 4. The connecting conveyor belt I 33 connects the outlet of the curing cabinet 4 and the outer peripheral area 19 of the detection and weighing disc 18, and is used to transport the rubber blocks in the curing cabinet 4 to the outer peripheral area 19 of the detection and weighing disc 18. The connecting conveyor belt II 34 connects the outer peripheral area 19 of the detection and weighing disc 18 and the inlet II 7 of the curing cabinet, and is used to transport the large rubber blocks that cannot be matched multiple times back to the temporary storage area of the curing cabinet 4.

[0038] The natural rubber drying and curing system also includes a host computer 26 composed of a set of hardware and software. The functions that can be achieved include wireless sensor acquisition, transmission, display and recording of the temperature in the curing cabinet and the weight data of the rubber blocks on each tray, calculation and weight matching of the rubber block weight data, real-time picture uploading and visual recognition by the camera, mapping of the raw point position and transmission of the positioning coordinates, and setting and control of the rotation direction and speed of the disc and ring brackets.

[0039] The natural rubber drying and curing system also includes a PLC controller 35 communicating with the host computer 26, and is connected to the hydraulic device through the PLC controller 35 to control the grasping, moving and dropping of the robotic arms at various places.

[0040] Preferably, the maximum number of rubber blocks that can be stacked in the curing area of the curing cabinet is the number of replenishment packaging blocks that can be processed in 3 hours, preferably 120 rubber block positions, and the temporary storage area is 30 rubber block positions.

[0041] Preferably, there are 13 large rubber block positions in the outer area 19 of the detection weighing disc 18, 8 large rubber block positions in the middle area 20, and 16 small rubber block positions in the central area 21. Example 4

[0042] As Figure 6 As shown, there is also a micro-rubber block replenishment box 36 pre-loaded with standard gram-weight rubber blocks suspended above the transportation from the briquetting frame 32 of the automatic weighing / replenishment integrated device 5 to the briquetting device 2. There is an ejection port below the micro-rubber block replenishment box 36. When the micro-rubber block ejection controller receives the signal of the number of micro-rubber blocks required to make up the weight from the host computer and detects that the briquetting frame 32 is directly below it, the corresponding number of micro-rubber blocks is ejected into the briquetting frame 32.

[0043] The specific embodiments of the present invention have been described in detail above with reference to the drawings. However, the present invention is not limited to the above embodiments. Various changes can be made without departing from the spirit of the present invention within the knowledge of those of ordinary skill in the art.

Claims

1. A natural rubber drying and curing system, comprising a tunnel drying kiln (1), a briquetting device (2) and a packaging device (3), characterized in that, A ripening cabinet (4) and an automatic weighing / supplementary weighing integrated device (5) are further arranged between the tunnel drying kiln (1) and the briquetting device (2); The ripening cabinet (4) is used to ripen the natural rubber blocks; The automatic weighing / supplementary weighing integrated device (5) has a three-layer structure with upper, middle and lower layers coaxially arranged, and is respectively used to realize three functions of instrument placement, weighing matching and block collection; The lowermost layer of the automatic weighing / supplementary weighing integrated device (5) is a conical cylinder (31) with a large inclination angle, and its bottom has a large opening directly connected to a briquetting frame (32). After the briquetting frame (32) receives a sufficient number of blocks of sufficient weight, it is transferred to the adjacent briquetting device (2) for briquetting, and then moved back to its original position after completion.

2. A natural rubber drying and ripening system according to claim 1, characterized in that: The ripening cabinet (4) is a hollow cabinet body provided with an inlet I (6), an inlet II (7) and an outlet (8). There is an intermediate channel (9) in the hollow cabinet body, and there are multi-layer rubber block placement racks (10) for placing rubber blocks and divided into a ripening area and a temporary storage area on both sides. Each layer of the rubber block placement rack (10) is provided with a tray (11) for placing rubber blocks with the size of the rubber blocks. The bottom of the tray (11) is provided with a weighing sensor (12) and a bracket (13) capable of controlling the parallel movement and up and down movement of the tray (11); An inlet hot air vent (15) is provided at the bottom of one side of the ripening cabinet (4), and a plurality of temperature sensors (16) are dispersedly arranged at different positions according to the space size inside; The ripening cabinet (4) is used to control the internal temperature to reach the required ripening temperature of the rubber blocks.

3. A natural rubber drying and ripening system according to claim 2, characterized in that: The three-layer structure with upper, middle and lower layers coaxially arranged of the automatic weighing / supplementary weighing integrated device (5) can be independently rotated layer by layer through their respective support columns under the action of a driving device (17). Its uppermost layer is a ring-shaped bracket for installing tools in two circles, its middle layer is a detection and weighing disc (18), and its lowermost layer is a conical cylinder (31) with a large inclination angle; The detection and weighing disc (18) is divided into three areas: the peripheral area (19), the middle area (20), and the central area (21). The peripheral area (19) is divided into an odd number of glue positions for placing single glue blocks, and each glue position is an adjustable tray (22). The adjustable tray (22) is a rectangular plate connected to the hollow solid skeleton of the detection and weighing disc (18), with a gap around it, and its length and width are larger than those of the glue block. In the width direction, it is connected to the mother board of the detection and weighing disc (18) by a hinge. At the bottom of each adjustable tray (22), there is also a weighing sensor (12) and a telescopic support frame (23). In the normal state, the adjustable tray (22) is flush with the detection and weighing disc (18). In the transportation state, the adjustable tray (22) is higher than the detection and weighing disc (18). The telescopic support frame (23) drives the adjustable tray (22) to translate towards the center of the disc along the gap. In the sinking state, the telescopic support frame (23) completely contracts, and the adjustable tray (22) droops to the vertical direction to allow the glue block to freely fall to the next layer. The middle area (20) is a secondary matching waiting area, and a circle of adjustable trays (22) is also arranged. Its size is also one circle larger than that of the glue block, and it can also present the normal state, the transportation state, and the sinking state. The central area (21) is a supplementary weight glue block cutting area, which is divided into multiple square area glue positions. On each glue position, an adjustable tray (22) for placing small glue blocks is also arranged, and its size is one circle larger than the size of the largest cut block in the normal situation. The annular support includes an outer ring annular support (24) that can rotate forward and backward and is suspended directly above the peripheral area (19), and an inner ring annular support (28) that is suspended above the central area (21) of the detection and weighing disc (18). A plurality of high-definition cameras (25) are dispersedly arranged on the outer ring annular support (24) from multiple angles for transmitting photos and videos to the host computer (26) for visual recognition of "production points"; a spiked cutter (27) that can move up and down and is used to remove the production points of the rubber blocks is also arranged at one place of the outer ring annular support (24). After the high-definition camera (25) recognizes the particle size and number of the production points on the surface, a judgment is made. When the number of production points with a particle size greater than a certain size does not exceed a certain quantity, the position coordinates of the production points are reported to the host computer (27), and the host computer (26) controls the spiked cutter (27) to remove the production points; when the number of production points with a particle size greater than a certain size exceeds a certain quantity, the telescopic support frame (23) drives the tray to translate along the gap to the middle area for temporary storage; a tool set (29) for cutting the compensating rubber blocks is arranged on the inner ring annular support (28), and the tool set (29) includes 3 parallel blades that can rotate in orientation and adjust the blade spacing. When the tool set (29) descends to the upper surface of the rubber block, the small retaining cylinder (30) preset on the adjustable tray (22) in the central area (21) extends 5 mm to 10 mm to fix the position of the rubber block within the area of the small retaining cylinder (30). The tool set (29) first cuts once along the width direction of the rubber block, then rotates 90° and cuts once along the length direction. The blade spacing is roughly adjusted according to the required weight of the small rubber blocks, and the compensating rubber block is cut into several small rubber blocks with different weights.

4. The natural rubber drying and curing system according to claim 1, wherein: There are a connecting conveyor belt I (33) and a connecting conveyor belt II (34) between the automatic weighing / compensating integrated device (5) and the curing cabinet (4). The connecting conveyor belt I (33) is connected to the outlet of the curing cabinet (4) and the peripheral area (19) of the detection and weighing disc (18) for transporting the rubber blocks in the curing cabinet (4) to the peripheral area of the detection and weighing disc (18); the connecting conveyor belt II (34) is connected to the peripheral area (19) of the detection and weighing disc (18) and the inlet II (7) of the curing cabinet for transporting the large rubber blocks that cannot be weight-matched multiple times back to the temporary storage area of the curing cabinet (4).

5. The natural rubber drying and curing system according to claim 1, wherein: The host computer (26) is used to realize wireless sensor acquisition, transmission, display and recording of the temperature in the curing cabinet and the weight data of the rubber blocks on each tray, calculation and weight matching of the rubber block weight data, real-time picture uploading and visual recognition of the camera, mapping of the production point position and transmission of the positioning coordinates, and setting and control of the rotation direction and speed of the disc and the ring support; It also includes a PLC controller (35) that communicates with the host computer (26), and controls the grasping, movement and dropping of the robotic arms at various places through the PLC controller (35) and is connected to the hydraulic device.

6. The natural rubber drying and curing system according to claim 3, wherein: Above the transportation of the briquetting frame (32) of the automatic weighing / supplementary weighing integrated device (5) to the briquetting device (2), a micro rubber block supplementary weighing box (36) pre-loaded with standard gram-level weight rubber blocks is suspended. There is an ejection port below the micro rubber block supplementary weighing box (36). When the ejection controller of the micro rubber block receives the signal of the number of micro rubber blocks required to make up the weight from the host computer (26) and detects that the briquetting frame (32) is directly below it, the corresponding number of micro rubber blocks is ejected into the briquetting frame (32).

7. A natural rubber drying and curing system according to claim 3, characterized in that: The maximum number of rubber blocks that can be stacked in the curing area of the curing cabinet (4) is 120 rubber positions, and the temporary storage area is 30 rubber positions; When the size of the raw points is greater than 3 mm and the number of raw points does not exceed 3, the host computer (26) controls the spiked cutter (27) to remove the raw points through the PLC controller (35); When the number of raw points with a size greater than 3 mm exceeds 3, it re-enters the curing cabinet (4) from the inlet II (of the curing cabinet) (7) through the connecting conveyor belt II (34), and after stacking, it is reheated for 1 to 2 hours; The supplementary weighing rubber block is cut into 16 small rubber blocks of different weights.

8. A natural rubber drying and curing system according to claim 7, characterized in that: There are 13 large rubber block positions in the peripheral area (19) of the detection weighing disc (18), 8 large rubber block positions in the middle area (20), and 16 small rubber block positions in the central area (21).

9. A natural rubber drying process for a natural rubber drying system according to any one of claims 1-8, characterized in that, Including the following steps: (1) Drying and curing Push the rubber granule rubber truck into the tunnel-type hot air drying kiln for drying. After drying, the rubber truck exits the drying kiln, remove the enclosures around the rubber truck, apply high-frequency and low-amplitude vibration to the bottom of the rubber truck, and transport the rubber blocks on the rubber truck to the curing cabinet for stacking and curing; (2) Raw point detection The cured rubber blocks are transported to the detection weighing disc through the conveyor belt. Each rubber block occupies a rubber position on the periphery of the disc. There is a tray on the rubber position, and the number of rubber positions is odd. Each rubber position tray corresponds to a number. Use machine vision to identify whether there are still raw points on the surface. If there are 1 to 3 raw points with a size greater than 3 mm, they are removed by the cutter or manually after being positioned by the machine. If the number of raw points with a size greater than 3 mm is more than 3, they re-enter the curing cabinet from the inlet II of the curing cabinet through the connecting conveyor belt II, and after stacking, they are reheated for 1 hour to 2 hours; (3) Automatic weighing / supplementary weighing, briquetting and packaging The weighing sensors under the trays on the disc rubber positions transmit the weight of each rubber block to the host computer in real time. The host computer calculates the sum of the weights of every two rubber blocks through a program, adopts a matching optimization algorithm to ensure that the number of groups with equal sum of the weights of two rubber blocks is as large as possible, determines which two numbered rubber blocks are combined, and selects the one rubber block that is least suitable for combination with other rubber blocks as the supplementary weighing rubber block; The supplementary weighing rubber block is cut into 16 small rubber blocks of different weights by the cutter twice, and the small rubber blocks are placed on the 16-grid trays in the central area of the detection weighing disc. After being detected by the weight sensor in the same way, they are matched to two large rubber blocks that need to make up the packaging weight; the two large rubber blocks with the matched weight and a supplementary weighing small rubber block are dropped into the briquetting frame at the same time, and after briquetting, they are packaged; Transport the rubber blocks without a suitable matching weight in the first round to the middle area of the detection and weighing disc. Complement the outer area of the disc with rubber blocks from the next batch. Then, transfer the weights of the rubber blocks to be secondarily matched and the weights of the rubber blocks to be primarily matched on the periphery to the host computer. Calculate the total weight matching again for two large rubber blocks and a small weight-supplementing rubber block. Drop the two large and one small rubber blocks with the total weight within the allowable weight range into the briquetting frame, and then complete briquetting and packaging. When the number of small rubber blocks is less than 1 / 3 of the set total weight-supplementing rubber block number, select large rubber blocks again for cutting and supplementation, and move the unmatched small rubber blocks to the middle area tray for temporary storage. If there are still no matched large rubber blocks after multiple cycles, give priority to selecting them as weight-supplementing rubber blocks for cutting. For the rubber blocks that still cannot find a suitable matching combination, move them back to the empty tray in the outer area of the detection and weighing disc. As the disc rotates, enter the aging cabinet again for temporary storage through conveyor belt II and the inlet II of the aging cabinet, and mark their positions and weights. Once other rubber blocks with suitable weights are matched for them in the database, they will be on the outer tray of the detection and weighing disc again from the aging cabinet. Control the rubber block and other paired rubber blocks to drop into the conical cylinder, and then transport them to the briquetting device through the briquetting frame to complete briquetting and packaging.

10. A natural rubber drying process according to claim 9, characterized in that: The rubber blocks without a suitable matching weight in the first round are not transported to the middle area of the detection and weighing disc. After two large rubber blocks are matched with the supplementary block closest to but not reaching the required weight, directly drop them into the briquetting frame. During the transportation of the briquetting frame to the briquetting device, add several pre-set micro rubber blocks for weight supplementation in grams to reach the required weight range, and then briquette and package the large and small rubber blocks that have reached the weight together. The temperature inside the tunnel-type hot air drying kiln is 105°C to 115°C, and the drying time is 1.5 hours to 2.5 hours. The ambient temperature inside the aging cabinet is 60°C to ⑨0°C, and the aging time is 4 hours to 6 hours.

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