A granulating device for producing cat litter

Abstract

The present invention relates to the technical field of raw material extrusion granulation, and specifically to a granulation device for cat litter production. The device takes into account that the ratio of raw materials to water is fixed for a granulation cycle, so a material state detection module and a recovery water tank are set after preliminary mixing, and the material mixing state at each moment in the current granulation cycle is determined by detecting the weight, water content and recovered water volume of the preliminary mixed material, and then the water replenishment rate is determined according to a variety of state information. By setting and controlling a secondary water spraying device, accurate water replenishment of the material is achieved, and then subsequent granulation production is carried out. The present invention avoids cost waste by setting a recovery water tank, enhances the material mixing effect and saves costs, and then obtains high-quality cat litter products through compression granulation.

Description

Technical Field

[0001] The invention relates to the technical field of raw material extrusion granulation, in particular to a granulation device for cat litter production. Background Art

[0002] In the production process of cat litter, the process quality of the granulation link affects the properties of cat litter particles such as shape, water absorption, deodorization effect, and service life. In the granulation process, the raw materials are mixed with the aqueous solution and then an extrusion granulator is used to extrude different templates to form cat litter particles of specific size and shape.

[0003] In the process of mixing raw materials and aqueous solutions, raw materials and water are mixed in a fixed ratio. Due to mechanical transmission problems of the equipment or other reasons, the raw materials and water may be mixed unevenly. Uneven mixing may cause raw material particles to stick together or remain on the equipment, causing equipment wear. If the raw materials are continuously replenished with water, it may cause excessive moisture, further affecting the quality of the raw materials and causing cost waste. Summary of the invention

[0004] In order to solve the technical problem that the existing device cannot effectively replenish water during the mixing process of cat litter raw materials and water, the object of the present invention is to provide a granulating device for cat litter production, and the technical scheme adopted is as follows:

[0005] The present invention provides a granulating device for cat litter production, comprising a feed inlet, a water-material mixing module, a roller pressing mechanism, and a pressing granulating module, wherein the water-material mixing module is connected to a recovery water tank, and the preliminary mixed material output by the water-material mixing module falls into a material state detection module after being screened by a sub-screen plate; the material state detection module is used to detect the water content and material weight of the preliminary mixed material, and send the detection data to a data analysis module; the recovery water tank is connected to a secondary water spraying device, and comprises a water volume detection module, and the water volume detection module is used to detect the amount of recovered water in the recovery water tank and send the result to the data analysis module;

[0006] The data analysis module obtains the water-to-material ratio conservation rate according to the material weight and the amount of recycled water, and obtains the weight unsaturation and the water unsaturation according to the material weight and the water content respectively; obtains the water replenishment rate according to the water-to-material ratio conservation rate, the weight unsaturation and the water unsaturation; and controls the secondary water spray device to replenish water to the material in the material state detection module according to the water replenishment rate;

[0007] After the water replenishment is completed, the material state detection module sends the material to the roller pressing mechanism, and after being processed by the roller pressing mechanism, it is sent to the pressing granulation module for cat litter granulation.

[0008] Furthermore, the material state detection module includes a plurality of moisture content sensors, a stirring paddle, a rotating shaft, a vertical screen and an inclined panel; the stirring paddle, the rotating shaft and the vertical screen are installed on the inclined panel, and the stirring paddle is connected to the rotating shaft; the vertical screen is installed at the top of the inclined surface of the inclined panel;

[0009] The stirring paddle pushes the material to the vertical screen under the rotation of the rotating shaft. The material is replenished with water during the process of passing through the vertical screen and falls onto the inclined plate, and then falls into the roller pressing mechanism through the inclined plate.

[0010] Furthermore, the water-material mixing module is composed of an atomizing nozzle, several spray nozzles and a screw conveyor. The feed port is opposite to the screw conveyor. The atomizing nozzle and several spray nozzles are installed directly above the screw conveyor. A recovery water tank is installed at the bottom of the screw conveyor. The screw conveyor transports the preliminary mixed material to the sub-screen plate.

[0011] Furthermore, the secondary water spraying device consists of a vertical water pipe, a control water pump and a transverse water pipe. One end of the vertical water pipe is connected to a recovery water tank, and the other end is connected to the control water pump; the control water pump is connected to the transverse water pipe, and replenishes water to the material through the nozzle at the other end of the transverse water pipe.

[0012] Furthermore, the method for obtaining the water-to-material ratio conservation rate includes:

[0013] The recovered water volume curve and the material weight curve in each granulation cycle are counted; the recovered water volume curve and the material weight curve are time-series aligned after being standardized, and the aligned curves are added to obtain the curve to be analyzed; the average data value on the curve to be analyzed is negatively correlated and normalized to obtain the water-to-material ratio conservation rate.

[0014] Furthermore, the method for obtaining the weight unsaturation comprises:

[0015] The standard weight is subtracted from the actual material weight at the last moment of a granulation cycle to obtain a weight deviation, and the weight deviation is normalized to obtain the weight unsaturation.

[0016] Furthermore, the method for obtaining the water unsaturation degree includes:

[0017] The average actual moisture content at all times collected by the moisture sensor at each position during the granulation cycle is obtained, the moisture content difference between the standard moisture content and the average actual moisture content is obtained, and the average moisture content difference at all positions is normalized to obtain the moisture unsaturation.

[0018] Furthermore, the method for obtaining the water replenishment rate includes:

[0019] For any granulation cycle, the water-to-material ratio conservation rate of the previous granulation cycle of the granulation cycle is negatively correlated and normalized to obtain the water replenishment weight at the moment, and the weight unsaturation is weighted according to the water replenishment weight to obtain the weighted weight unsaturation, and the average value of the weighted weight unsaturation and the water unsaturation is used as the water replenishment rate of the granulation cycle.

[0020] Further, controlling the secondary water spraying device to replenish water to the material in the material state detection module 6 according to the water replenishment rate includes:

[0021] The water replenishment rate is multiplied by the amount of water in the recovery water tank to obtain the water replenishment amount, and the water replenishment speed is determined according to the water replenishment amount and the granulation cycle time; the secondary water spray device is controlled according to the water replenishment amount and the water replenishment speed to replenish water to the material in the material state detection module 6.

[0022] Furthermore, a dehydration metal plate is included between the rolling mechanism and the pressing granulation module. The surface of the dehydration metal plate has sieve holes, and a waste box is installed at the bottom. The sieve holes on the surface are used to sieve water and unmixed waste into the waste box.

[0023] The present invention has the following beneficial effects:

[0024] The present invention takes into account that the ratio of raw materials to water is fixed for a granulation cycle, so a material state detection module and a recovery water tank are set after preliminary mixing, and the material mixing state at each moment in the current granulation cycle is determined by detecting the weight, water content and recovered water volume of the preliminary mixed material, and then the water replenishment rate is determined according to a variety of state information. By setting and controlling a secondary water spraying device, accurate water replenishment of the material is achieved, and because the setting of the recovery water tank also avoids cost waste, the material mixing effect is enhanced while saving costs, and then a high-quality cat litter product is obtained by pressing and granulating. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A main body structure diagram of a granulating device for producing cat litter provided by one embodiment of the present invention;

[0027] Figure 2 A schematic diagram of a screening plate provided by an embodiment of the present invention;

[0028] Figure 3 A partial schematic diagram of a material status detection module provided by an embodiment of the present invention;

[0029] Figure 4 A schematic diagram of a vertical screen provided by an embodiment of the present invention;

[0030] Figure 5 A schematic diagram of a roller device in a rolling mechanism provided by an embodiment of the present invention;

[0031] Figure 6 A schematic diagram of a dehydration metal plate provided by an embodiment of the present invention;

[0032] Figure 7 A schematic diagram of a granulation template of a compression granulation module provided by one embodiment of the present invention;

[0033] Figure 8 A schematic diagram of a water recovery tank provided by an embodiment of the present invention;

[0034] Fig. 9 A flow chart of a data processing method of a data analysis module provided by an embodiment of the present invention.

[0035] In the figure, 1. feed inlet; 2. atomizing nozzle; 3. spray nozzle; 4. screw conveyor; 5. screening plate; 6. material status detection module; 61. stirring paddle; 62. rotating shaft; 63. inclined plate; 7. vertical screen; 8. roller; 9. dehydration metal plate; 10. granulation template; 11. pressing plate; 12. cylinder; 13. data analysis module; 14. vertical water pipe; 15. control water pump; 16. horizontal water pipe; 17. recovery water tank; 18. waste box; 19. conveyor belt. DETAILED DESCRIPTION

[0036] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of a granulating device for cat litter production proposed by the present invention, its specific implementation, structure, features and effects, in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0037] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0038] The embodiment of the present invention provides a granulating device for producing cat litter, which is an integrated device integrating material mixing and pressing. Material mixing refers to the mixing of cat litter raw materials and aqueous solutions, thereby realizing the functions of cat litter such as water absorption and deodorization. The raw material ratio of cat litter and the ratio of aqueous solution are both preliminary preparation processes. That is, after the ratio is completed, it is mixed and granulated by this device. Common cat litter raw materials include pine wood chips, tofu dregs, bentonite, etc. The embodiment of the present invention takes common bentonite as an example to briefly explain the preliminary preparation process in this embodiment:

[0039] (1) Put the bentonite cat litter raw material into a Raymond mill for crushing. Before crushing, add 2%-3% sodium carbonate powder to the bentonite to increase the adsorption and water absorption of the bentonite cat litter to obtain a 200-mesh raw material powder.

[0040] (2) Prepare the corresponding proportion of clean water according to the total amount of raw materials. Generally, when bentonite powder is used as the raw material, the weight ratio k of clean water to raw material powder is 30:100. The ideal water content of the mixture can be obtained as 3 / 13, recorded as N. Clean water will be lost during the mixing process, so an additional 5%-10% of clean water can be added.

[0041] (3) Adding about 0.2% potassium permanganate solution to clean water can disinfect and sterilize the finished cat litter; adding 1% water glass solution can increase the aggregation of bentonite powder.

[0042] After the preliminary preparation is completed, the raw materials can be fed into the water-material mixing module through the feed port 1, and the aqueous solution can be injected into the water tank of the water-material mixing module in advance. The device can be started to mix the water and material and press.

[0043] The granulation device for producing cat litter in the embodiment of the present invention includes common modules in existing devices, such as a feed inlet 1, a water-material mixing module, a roller pressing mechanism, and a pressing and granulation module. The raw material enters the water-material mixing module through the feed inlet 1 to be mixed with the prepared aqueous solution. The roller pressing mechanism is used to perform roller pressing on the mixed material, and by squeezing the material tightly, it is convenient for the pressing and granulation module to granulate cat litter. Please refer to Figure 5 , which shows a schematic diagram of a roller device in a rolling mechanism provided by an embodiment of the present invention, and the rolling is achieved by a roller 8. Figure 7 As shown, Figure 7 A schematic diagram of a granulation template 10 of a compression granulation module provided by an embodiment of the present invention, a common cat litter shape can be formed through the circular holes in the granulation template 10. These modules are well known to those skilled in the art and will not be described in detail here.

[0044] Furthermore, the water-material mixing module of the device is also connected to a recycling water tank 17, in which a water volume detection module is installed. When the water-material mixing module mixes the material and the aqueous solution, if the material is mixed unevenly, resulting in some water not being completely absorbed, the water volume in the recycling water tank 17 will increase significantly. Therefore, the water volume detection module sends the detected recycled water volume in the recycling water tank 17 to the data analysis module 13 for analysis of the mixing state. The recycling water tank 17 is further connected to a secondary water spraying device, which can use the water in the recycling water tank 17 to replenish the material on the material state detection module 6. Please refer to Figure 8 , which shows a schematic diagram of a recycling water tank 17 provided by an embodiment of the present invention. The recycling water tank 17 includes a plurality of water grooves, and the excess unmixed water in the water-material mixing module will flow into the tank along the water grooves.

[0045] After the preliminary mixing, the water-material mixing module passes the preliminary mixed material through the sub-screen plate 5 and then drops it into the material state detection module 6. Considering that the material transported by the water-material mixing module may become blocky or scattered due to mixing problems, if it is a large block, the material detection module cannot accurately and evenly obtain the material state data, and directly transporting the material from the water-material mixing module may cause the material to accumulate, so the sub-screen plate 5 is set to screen the material so that it is evenly scattered. The material state detection module 6 is used to detect the water content and material weight of the preliminary mixed material. These two types of information intuitively represent the state of the material after mixing by the water-material mixing module, and after screening by the sub-screen plate 5, the material can fall evenly on the material state detection module 6, making the detected data more accurate, and the data is sent to the data analysis module 13 for subsequent analysis of the mixing state.

[0046] The data analysis module 13 is used to analyze the received data, obtain the current material mixing state by analyzing the data, and then determine the water replenishment rate. According to the water replenishment rate, a control command can be transmitted to the secondary water spray device to control the secondary water spray device to replenish water to the material in the material state detection module 6. After the water replenishment is completed, the material detection module sends the material to the roller pressing mechanism, and after being processed by the roller pressing mechanism, it is sent to the pressing granulation module for cat litter granulation. It should be noted that the cat litter after pressing still needs post-processing steps such as drying and cooling to reduce the moisture content to below 6%, and the finished cat litter can be obtained.

[0047] Preferably, in the embodiment of the present invention, the material state detection module 6 includes a plurality of moisture content sensors, and also includes a stirring paddle 61 , a rotating shaft 62 , a vertical screen 7 and an inclined panel 63 .

[0048] In an embodiment of the present invention, the moisture content sensor adopts a capacitive sensor. The capacitive sensor determines the moisture content by measuring the dielectric constant of the material. The dielectric constant of water is significantly higher than that of dry material. Therefore, the water content can cause a change in capacitance, thereby obtaining moisture content data. Because the embodiment of the present invention is intended to analyze the state of the material, there is no need to obtain the real moisture content data. It can be directly replaced by the capacitance data, which can also characterize the moisture content information. The embodiment of the present invention further arranges the moisture content sensors at equal intervals to form a sensing array, so as to collect moisture content information at multiple positions on the material state monitoring module. In an embodiment of the present invention, the weight of the material can be collected by installing a weight sensor on the material state detection module 6.

[0049] The stirring paddle 61, the rotating shaft 62, and the vertical screen 7 are mounted on the inclined plate 63, and the stirring paddle 61 is connected to the rotating shaft 62. That is, the stirring paddle 61 can move the material on the material state detection module 6 by rotating, thereby playing a conveying role.

[0050] The vertical screen 7 is installed at the top of the inclined surface of the inclined plate 63. The stirring paddle 61 pushes the material to the vertical screen 7 under the rotation of the rotating shaft 62. The material is replenished with water during the process of passing through the vertical screen 7, and then falls on the inclined plate 63 and falls into the roller pressing mechanism through the inclined plate 63. Figure 2 as well as Figure 4 , Figure 2 A schematic diagram of a sub-screening plate 5 provided by an embodiment of the present invention is provided. Figure 4 A schematic diagram of a vertical screen 7 provided by an embodiment of the present invention is provided, wherein the purpose of the vertical screen 7 is similar to that of the sub-screen plate 5, both of which are to uniformly drop the conveyed material into the next mechanism through the sieve holes on the surface.

[0051] See also Figure 3 , which shows a partial schematic diagram of a material state detection module 6 provided by an embodiment of the present invention. In this partial area, it can be seen that the stirring paddle 61, the rotating shaft 62 and the inclined plate 63 in the material state detection module 6 are connected to each other. At the initial moment of the granulation cycle, the stirring paddle 61 stays at Figure 3 At the 0° position in the mixing bowl, after the water replenishment is completed, the stirring paddle 61 is started and rotated by the rotating shaft 62 until it rotates to 180°, pushing the material to the vertical screen 7 at the top of the inclined plate 63. The material passes through the screen and falls evenly along the inclined surface of the inclined plate 63 and falls into the roller pressing mechanism.

[0052] Preferably, in one embodiment of the present invention, the water-material mixing module is composed of an atomizing nozzle 2, a plurality of spray nozzles 3 and a screw conveyor 4, the feed port 1 is directly opposite to the screw conveyor 4, the atomizing nozzle 2 and a plurality of spray nozzles 3 are installed directly above the screw conveyor 4, a recovery water tank 17 is installed at the lower part of the screw conveyor 4, and the screw conveyor 4 conveys the preliminary mixed material to the sub-screen plate 5. It should be noted that the screw conveyor 4 in the embodiment of the present invention is an open screw conveyor 4, and the raw materials can be mixed with water more evenly through the rotation and transportation of the screw conveyor 4. The atomizing nozzle 2 can quickly wet the raw material powder to avoid dust floating, and then a plurality of spray nozzles 3 are used to achieve uniform mixing of the water material. Because the water spraying amount of a single spray nozzle 3 is large, once the water flow of the nozzle fluctuates, it is difficult to control the control deviation of water and materials in the mixing process, and the large water flow may flush the raw materials out of the screw conveyor 4. Therefore, the embodiment of the present invention adopts the form of multiple spray nozzles 3, reduces the water spraying amount and water spraying pressure of each spray nozzle 3, and ensures the full mixing of materials and water through multiple spraying. In the embodiment of the present invention, two spray nozzles 3 are arranged behind the atomizing nozzle 2 along the conveying direction of the screw conveyor 4.

[0053] Preferably, in one embodiment of the present invention, the secondary water spraying device is composed of a vertical water pipe 14, a control water pump 15 and a horizontal water pipe 16. One end of the vertical water pipe 14 is connected to a recovery water tank 17, and the other end is connected to the control water pump 15. The control water pump 15 is connected to the horizontal water pipe 16, and the material is replenished with water through the nozzle at the other end of the horizontal water pipe 16. The vertical and horizontal coordination can make the water in the recovery water tank 17 accurately sprayed on the material to be replenished with water.

[0054] Preferably, in one embodiment of the present invention, a dehydration metal plate 9 is further included between the roller pressing mechanism and the pressing granulation module. The surface of the dehydration metal plate 9 has sieve holes, and a waste box 18 is installed at the bottom. The sieve holes on the surface are used to sieve water and unmixed waste into the waste box 18. The arrangement of the dehydration metal plate 9 can further recycle waste, avoid material waste, and keep the production environment clean. Figure 6 , which shows a schematic diagram of a dehydration metal plate 9 provided in one embodiment of the present invention, through the gaps on the surface of the dehydration metal plate 9, excess water and material powder can fall into the waste box 18.

[0055] See also Figure 1, which shows a main body structure diagram of a granulation device for cat litter production provided by an embodiment of the present invention, wherein the material is fed into the screw conveyor 4 through the feed port 1, and the water material is mixed through the atomizing nozzle 2 and two spray nozzles 3 during the mixing and transportation of the material by the screw conveyor 4. During the mixing process, the excess water falls into the recovery water tank 17 through several water outlets at the bottom of the screw conveyor 4, wherein the water outlets have a small diameter and a large interval, and only when a large amount of water is accumulated will it flow down from the water outlets. The preliminarily mixed material is transported by the screw conveyor 4 and falls onto the sub-screen plate 5, which is placed at an angle. Through the rolling of the inclined surface, regardless of whether the material is fully mixed, it slides down along the inclined surface through the sieve hole, so that the screened material falls evenly onto the material state detection module 6. The data analysis module 13 determines the water replenishment rate by analyzing the data transmitted by the material state detection module 6 and the recovery water tank 17, and sends a control command to the control water pump 15. The control water pump 15 sprays the water in the recovery water tank 17 on the material in the material state detection module 6 through the vertical water pipe 14 and the horizontal water pipe 16 to achieve water replenishment. After the water replenishment is completed, the material state detection module 6 transports the material to the vertical screen 7. After screening by the vertical screen 7, the material falls evenly on the roller 8 for rolling. During the rolling process, the excess water and unmixed waste are dropped from the inclined surface of the dehydration metal plate 9 into the waste box 18 through the dehydration metal plate 9. The mixed material is finally on the granulation template 10, and the piston rod is driven up and down by the cylinder 12, which drives the control pressing plate 11 to be pressed. During the pressing process, the material passes through the die hole of the granulation template 10 to form a cat litter of fixed shape and size, thereby realizing cat litter granulation. The successfully pressed cat litter is conveyed by the conveyor belt 19.

[0056] It should be noted that in the embodiment of the present invention, in order to facilitate the data processing of the subsequent data analysis module 13, the material conveying time of the screw conveyor 4 is set to be the same as the conveying data of the stirring paddle 61, which is set to 5 seconds, that is, the granulation cycle duration in the embodiment of the present invention is 5 seconds. And each sensor is set to collect data once per second.

[0057] See also Fig. 9 , which shows a flow chart of a data processing method of a data analysis module 13 provided by an embodiment of the present invention, the method comprising:

[0058] Step S101: Obtain the water-to-material ratio conservation rate according to the material weight and the amount of recovered water.

[0059] When the water-material mixing is stable, the water content and weight of the material at each position in the water-material mixing module should be uniform, and the discharge speed to the next module should also be uniform. When the materials in the water-material mixing module are not mixed uniformly, the discharge amount will be unstable due to the instability of the material state, and recycled water will be generated in the recycling water tank 17. As for the amount of recycled water in the recycling water tank 17, it has an obvious correlation with the weight of the material on the material state detection module 6. If the water-material mixing is normal, the amount of recycled water in the recycling water tank 17 is small, indicating that the material absorbs water fully, and the weight of the material on the material state detection module 6 will be larger. Similarly, the more recycled water, the less material weight, indicating that the material on the material state detection module 6 at this time is also a material that absorbs water fully. On the contrary, if the amount of recycled water and the weight of the material do not satisfy this negative correlation, it means that the water-material mixing is unstable at this time, and the material mixing on the material state detection module 6 is insufficient. Therefore, the water-material ratio conservation rate can be obtained through the weight of the material and the amount of recycled water. The smaller the water-to-material ratio conservation rate is, the more uneven the material mixing is. There may be unmixed material residues in the water-to-material mixing module, which will affect the water absorption during the next batch of water-to-material mixing. That is, the water-to-material ratio conservation rate represents the impact of the current moment on the mixing at subsequent moments.

[0060] Step S102: Obtain weight unsaturation and moisture unsaturation according to the material weight and moisture content, respectively.

[0061] Further considering that the material weight and water content on the material state detection module 6 are data that directly represent the mixing state, because the ratio of raw materials to water in a granulation cycle is fixed, the material weight and water content on the material state detection module 6 can directly represent the material mixing state. Therefore, the corresponding weight unsaturation and water unsaturation can be obtained by analyzing the data of the two dimensions separately.

[0062] Step S103: obtaining the water replenishment rate according to the water-to-material ratio conservation rate, weight unsaturation and water unsaturation.

[0063] Combined with the water-to-material ratio conservation rate, weight unsaturation and water unsaturation obtained in step S101 and step S102, the greater the water-to-material ratio conservation rate, the better the mixing effect is at this time, and the less water replenishment is needed; the greater the weight unsaturation and the greater the water unsaturation, the more abnormal the material mixing state is, and the more water replenishment is needed. Therefore, the water replenishment rate can be obtained based on the three characteristics, and the greater the water replenishment rate, the more water replenishment is needed.

[0064] Step S104: controlling the secondary water spraying device to replenish water to the material in the material state detection module 6 according to the water replenishment rate.

[0065] According to the water replenishment rate, a control command can be sent to the secondary water spraying device to control the secondary water spraying device to perform water replenishment operation on the material in the material state detection module 6.

[0066] Preferably, in one embodiment of the present invention, because each sensor collects data according to a preset sampling frequency during the granulation cycle, that is, the data of each dimension corresponds to a data curve in each granulation cycle. For the acquisition process of the water-to-material ratio conservation rate, because the data of the recovered water volume curve is mainly concentrated in the working time of the water-to-material mixing module, and the data of the material weight curve is concentrated in a period of time after the water-to-material mixing module conveys the material to the material state detection module 6, the time series range of the two data is inconsistent, and the data value range and unit are inconsistent. Therefore, the embodiment of the present invention first counts the recovered water volume curve and the material weight curve in each granulation cycle, and then performs time series alignment after the recovered water volume curve and the material weight curve are standardized. The data after standardization eliminates the influence of the dimension, and the value range is limited to between 0 and 1. After the time series alignment, considering that the two features should show an obvious negative correlation under the normal water-to-material mixing state, the aligned curves are added to obtain the curve to be analyzed. The closer the data value on the curve to be analyzed is to 0, that is, the smaller the data value, indicating that the material weight and the recovered water volume show an obvious negative correlation at this time, the greater the water-to-material ratio conservation rate will be. Considering that there are multiple data on the curve to be analyzed, the average data value is negatively correlated and normalized to obtain the water-to-material ratio conservation rate under the corresponding granulation cycle. In the embodiment of the present invention, the process of negative correlation mapping and normalization is expressed by the formula: ,in is the water-to-material ratio conservation rate of the t-th granulation cycle, e is a natural constant, is the average data value on the curve to be analyzed in the t-th granulation cycle. That is, negative correlation mapping and normalization are achieved by taking the opposite number of the average data value as the power of an exponential function with a natural constant as the base.

[0067] Preferably, in one embodiment of the present invention, the method for obtaining weight unsaturation comprises:

[0068] The standard weight is subtracted from the actual material weight at the last moment of a granulation cycle to obtain the weight deviation, and the weight deviation is normalized to obtain the weight unsaturation. In one embodiment of the present invention, because the ratio of material to water is fixed, taking 1:k as an example, it can be understood that one part of the weight of the raw material corresponds to k parts of the weight of water; therefore, the formula for obtaining the weight unsaturation can be expressed as: ;in is the weight unsaturation of the t-th granulation cycle; It represents the coefficient of water-to-material ratio, T is the total number of moments in the granulation cycle, V is the weight of the material entering the feed port 1 at each moment, It is the actual material weight at the last moment of the granulation cycle detected by the material state detection module 6. It represents the standard weight and uses the standard weight as the denominator to normalize the weight deviation.

[0069] Preferably, in one embodiment of the present invention, the method for obtaining water unsaturation comprises:

[0070] Because the material state detection module 6 can detect the moisture content at multiple positions, the moisture content at each position corresponds to a set of data in the granulation cycle, so the average actual moisture content of all moments collected by the moisture content sensor at each position in the granulation cycle is obtained, the moisture content difference between the standard moisture content and the average actual moisture content is obtained, and the average moisture content difference at all positions is normalized to obtain the moisture unsaturation. In one embodiment of the present invention, the moisture unsaturation is expressed by the formula: ;in is the moisture unsaturation of the t-th granulation cycle, is the number of moisture content sensors, is the average actual moisture content collected by the i-th moisture sensor in the t-th granulation cycle, is the standard water content. That is, the standard water content is also used as the denominator to achieve the purpose of normalization.

[0071] Preferably, in one embodiment of the present invention, the method for obtaining the water replenishment rate includes:

[0072] Because the conservation rate of water-to-material ratio is the influence on the water-to-material mixing at the next moment, for any granulation cycle, the conservation rate of water-to-material ratio of the previous granulation cycle of the granulation cycle is negatively correlated and normalized to obtain the water replenishment weight at the moment. The larger the water replenishment weight, the more water replenishment is needed in the granulation cycle at this time. The weight unsaturation is weighted according to the water replenishment weight to obtain the weighted weight unsaturation. The average value of the weighted weight unsaturation and the water unsaturation is taken as the water replenishment rate of the granulation cycle. The intuitive state data of the two dimensions are integrated in the form of average values.

[0073] In the embodiment of the present invention, because the water-to-material ratio conservation rate has a value range of 0 to 1, the water replenishment weight can be obtained by subtracting the water-to-material ratio conservation rate from the positive integer 1, and the weighted weight unsaturation can be obtained by multiplying the water replenishment weight by the weight unsaturation.

[0074] Preferably, in one embodiment of the present invention, the secondary water spraying device is controlled to replenish water to the material in the material state detection module 6 according to the water replenishment rate, including:

[0075] The water replenishment rate is multiplied by the amount of water in the recovery water tank 17 to obtain the water replenishment amount. The water replenishment speed is determined according to the water replenishment amount to ensure that the material can be fully replenished with water; the secondary water spray device is controlled according to the water replenishment amount and the water replenishment speed to replenish water to the material in the material state detection module 6.

[0076] In one embodiment of the present invention, because the water replenishment operation is to push the material to the vertical screen 7, the water replenishment operation is performed while the material passes through the vertical screen 7. Therefore, the time it takes for the material to completely pass through the vertical screen 7 can be counted, and the water replenishment rate can be obtained by dividing the water replenishment amount by the time.

[0077] It should be noted that the sequence of the above embodiments of the present invention is only for description and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0078] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

Claims

1. A granulation device for cat litter production, comprising a feed inlet (1), a water-material mixing module, a roller pressing mechanism, and a pressing granulation module, characterized in that: The water-material mixing module is connected to a recovery water tank (17); the preliminary mixed material output by the water-material mixing module is screened by a sub-screen plate (5) and then falls into a material state detection module (6); the material state detection module (6) is used to detect the water content and material weight of the preliminary mixed material, and send the detection data to the data analysis module (13); the recovery water tank (17) is connected to the secondary water spraying device, and includes a water volume detection module, the water volume detection module is used to detect the amount of recovered water in the recovery water tank (17) and send it to the data analysis module (13); The data analysis module (13) obtains the water-to-material ratio conservation rate according to the material weight and the amount of recycled water, and obtains the weight unsaturation and the water unsaturation according to the material weight and the water content respectively; obtains the water replenishment rate according to the water-to-material ratio conservation rate, the weight unsaturation and the water unsaturation; and controls the secondary water spraying device to replenish water to the material in the material state detection module (6) according to the water replenishment rate; After the water replenishment is completed, the material state detection module (6) sends the material to the roller pressing mechanism, and after being processed by the roller pressing mechanism, it is sent to the pressing granulation module for cat litter granulation; The material state detection module (6) comprises a plurality of moisture content sensors, and also comprises a stirring paddle (61), a rotating shaft (62), a vertical screen (7) and an inclined panel (63); the stirring paddle (61), the rotating shaft (62) and the vertical screen (7) are mounted on the inclined panel (63), and the stirring paddle (61) and the rotating shaft (62) are connected; the vertical screen (7) is mounted on the top of the inclined surface of the inclined panel (63); The stirring paddle (61) pushes the material to the vertical screen (7) under the rotation of the rotating shaft (62); the material is replenished with water while passing through the vertical screen (7) and falls onto the inclined plate (63); and then falls into the roller pressing mechanism through the inclined plate (63); The method for obtaining the water-to-material ratio conservation rate includes: Counting the recovered water volume curve and the material weight curve in each granulation cycle; performing time series alignment on the recovered water volume curve and the material weight curve after standardization, and adding the aligned curves to obtain the curve to be analyzed; negatively correlating and normalizing the average data value on the curve to be analyzed to obtain the water-to-material ratio conservation rate; The method for obtaining the weight unsaturation comprises: Subtracting the standard weight from the actual material weight at the last moment of a granulation cycle to obtain a weight deviation, and normalizing the weight deviation to obtain the weight unsaturation; The method for obtaining the water unsaturation degree comprises: Obtaining the average actual moisture content at all times collected by the moisture sensor at each position during the granulation cycle, obtaining the moisture content difference between the standard moisture content and the average actual moisture content, normalizing the average moisture content difference at all positions, and obtaining the moisture unsaturation; The method for obtaining the water replenishment rate includes: For any granulation cycle, the water-to-material ratio conservation rate of the previous granulation cycle of the granulation cycle is negatively correlated and normalized to obtain the water replenishment weight at the moment, and the weight unsaturation is weighted according to the water replenishment weight to obtain the weighted weight unsaturation, and the average value of the weighted weight unsaturation and the water unsaturation is used as the water replenishment rate of the granulation cycle.

2. A granulating device for cat litter production according to claim 1, characterized in that: The water-material mixing module is composed of an atomizing nozzle (2), a plurality of spray nozzles (3) and a screw conveyor (4); the feed port (1) is directly opposite to the screw conveyor (4); the atomizing nozzle (2) and the plurality of spray nozzles (3) are installed directly above the screw conveyor (4); a recovery water tank (17) is installed at the bottom of the screw conveyor (4); and the screw conveyor (4) conveys the preliminary mixed material to the sub-screen plate (5).

3. A granulating device for cat litter production according to claim 2, characterized in that: The secondary water spraying device is composed of a vertical water pipe (14), a control water pump (15) and a transverse water pipe (16); one end of the vertical water pipe (14) is connected to a recovery water tank (17), and the other end is connected to the control water pump (15); the control water pump (15) is connected to the transverse water pipe (16), and water is supplied to the material through a nozzle at the other end of the transverse water pipe (16).

4. A granulating device for cat litter production according to claim 1, characterized in that: The controlling the secondary water spraying device to replenish water to the material in the material state detection module (6) according to the water replenishment rate comprises: The water replenishment rate is multiplied by the amount of water in the recovery water tank (17) to obtain a water replenishment amount, and a water replenishment speed is determined according to the water replenishment amount and the granulation cycle time; and the secondary water spray device is controlled according to the water replenishment amount and the water replenishment speed to replenish water to the material in the material state detection module (6).

5. A granulating device for cat litter production according to claim 1, characterized in that: A dehydration metal plate (9) is also provided between the roller pressing mechanism and the pressing and granulation module. The surface of the dehydration metal plate (9) has sieve holes, and a waste box (18) is installed at the bottom. The sieve holes on the surface are used to sieve water and unmixed waste into the waste box (18).

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