Sand mill production line

Abstract

The utility model relates to the technical field of sand mills, and provides a sand mill production line which comprises a hot water tank, a plate heat exchanger, a sand mill, a blockage detection device and a controller, the inlet end of the plate heat exchanger is selectively communicated with the hot water tank, and the outlet end of the plate heat exchanger is communicated with the sand mill; the blockage detection device is installed on a pipeline communicated with the plate heat exchanger and used for detecting whether the plate heat exchanger is blocked or not. The blocking detection device is connected with the controller, and when the blocking detection device detects blocking, the controller is used for controlling the hot water tank to be communicated with the plate heat exchanger so that hot water can be used for flushing the plate heat exchanger. According to the grinding machine production line, disassembly and assembly of the plate heat exchanger are avoided, waste of materials is avoided, automatic cleaning of the plate heat exchanger in the operation process of the grinding machine is achieved, and the production efficiency of the grinding machine production line and the automation degree of the grinding machine production line are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sand mills, in particular to a sand mill production line. Background Art

[0002] Sand mills are used to produce lithium iron phosphate. With the increasing demand for lithium iron phosphate, the production and manufacturing of lithium iron phosphate tends to be integrated and scaled, so sand mills tend to transform into large-scale ones.

[0003] In the process of sand mill transformation towards large-scale, the plate heat exchanger supporting the sand mill also tends to be large-scale, which makes the cleaning of the plate heat exchanger of the sand mill more difficult. The cleaning method and degree of cleaning mostly rely on the experience of the operator, resulting in the cleaning effect being greatly affected by human factors. In severe cases, the plate heat exchanger may be disassembled for cleaning, resulting in waste of materials. Utility Model Content

[0004] The utility model provides a sand mill production line, which is used to solve the problem in the prior art that the plate changer of the sand mill is difficult to automatically clean.

[0005] The utility model provides a sand mill production line, comprising: a hot water tank, a plate heat exchanger, a sand mill, a blockage detection device and a controller;

[0006] The inlet end of the plate heat exchanger is selectively connected to the hot water tank, and the outlet end of the plate heat exchanger is connected to the sand mill;

[0007] The blockage detection device is installed on a pipe connected to the plate heat exchanger, and is used to detect whether the plate heat exchanger is blocked;

[0008] The blockage detection device is connected to the controller. When the blockage detection device detects blockage, the controller is used to control the conduction between the hot water tank and the plate heat exchanger to flush the plate heat exchanger with hot water.

[0009] A sand mill production line provided by the utility model further includes: a first material pipeline and a hot water pipeline;

[0010] The first material pipeline is used to input materials into the plate heat exchanger, one end of the hot water pipeline is connected to the hot water tank, and the other end of the hot water pipeline is connected to the first material pipeline;

[0011] The first material pipeline is equipped with a first control valve, and the hot water pipeline is equipped with a second control valve;

[0012] The controller is connected to the first control valve and the second control valve; the controller is used to control the first control valve and the second control valve so that when one of the first control valve and the second control valve is turned on, the other one is turned off.

[0013] According to a sand mill production line provided by the utility model, the hot water tank is equipped with a heating element and a temperature sensor;

[0014] The heating element is installed at the bottom of the hot water tank, the temperature sensor is installed at the hot water tank, the temperature sensor is connected to the controller, and the controller is connected to the heating element.

[0015] According to a sand mill production line provided by the utility model, the hot water tank is equipped with a water level gauge;

[0016] The water level meter is installed on the top of the hot water tank, and the water level meter is connected to the controller.

[0017] According to a sand mill production line provided by the utility model, the hot water pipeline is installed with a diaphragm pump;

[0018] The diaphragm pump pumps the hot water in the hot water tank into the plate heat exchanger.

[0019] According to a sand mill production line provided by the utility model, a filter and an iron remover are installed on the first material pipeline;

[0020] Along the flow direction of the material in the first material pipeline, the filter and the iron remover are located after the inlet of the hot water pipeline.

[0021] According to the utility model, a sand mill production line is provided, further comprising: a second material pipeline; the second material pipeline is respectively connected to the plate heat exchanger and the sand mill;

[0022] The clogging detection device includes a first flow meter and a second flow meter;

[0023] The first flow meter is arranged on the first material pipeline, and the second flow meter is arranged on the second material pipeline;

[0024] The first flow meter and the second flow meter are connected to the controller respectively. When the difference between the first flow meter and the second flow meter exceeds a preset value, the controller controls the hot water pipeline to be connected to the first material pipeline.

[0025] According to a sand mill production line provided by the utility model, it also includes a sewage discharge pipeline;

[0026] One end of the sewage pipe is connected to the second material pipe, and the other end is connected to the sewage main pipe;

[0027] The sewage pipe is provided with a third control valve, the second material pipe is provided with a fourth control valve, and the third control valve and the fourth control valve are connected to the controller.

[0028] According to a sand mill production line provided by the utility model, it also includes a hot water circulation pipeline;

[0029] One end of the hot water circulation pipe is connected to the sewage pipe, and the other end is connected to the hot water tank.

[0030] According to a sand mill production line provided by the utility model, a three-way electric control valve is arranged at the connection between the sewage pipe and the hot water circulation pipe;

[0031] The three-way electrically controlled valve is connected to the controller.

[0032] The sand mill production line provided by the utility model is provided with a hot water tank on the sand mill production line, and a blockage detection device is provided on the pipeline connected with the plate heat exchanger. When the blockage detection device feeds back a blockage signal, the controller controls the conduction between the hot water tank and the plate heat exchanger, and the hot water in the hot water tank flushes the inner wall of the plate heat exchanger until the blockage detection signal can detect no blockage signal. The controller controls the shutoff of the hot water tank and the plate heat exchanger, and the plate heat exchanger resumes the connection with the material conveying channel and the sand mill, and the normal operation of the sand mill production line is restored. The utility model can monitor the blockage state of the plate heat exchanger in real time, and flush it immediately when there is a slight blockage on the inner wall of the plate heat exchanger. After flushing, it automatically switches to the normal working state of the sand mill production line. The flushing process of the plate heat exchanger is short in time and has no effect on the normal operation of the sand mill. It not only avoids the disassembly and installation of the plate heat exchanger, but also avoids the waste of materials, realizes the automatic cleaning of the plate heat exchanger during the operation of the sand mill, and improves the production efficiency and automation degree of the sand mill production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 It is a schematic diagram of the process of the sand mill production line provided by the utility model;

[0035] Figure 2 It is a control logic block diagram of the sand mill production line provided by the utility model.

[0036] Reference numerals:

[0037] 1. Sand mill production line;

[0038] 11. hot water tank; 12. plate heat exchanger; 13. sand mill; 14. blockage detection device; 15. controller; 16. first material pipeline; 17. hot water pipeline; 18. second material pipeline; 19. sewage pipeline; 20. hot water circulation pipeline; 21. three-way electric control valve; 111. heating element; 112. temperature sensor; 113. water level meter; 141. first flow meter; 142. second flow meter; 161. first control valve; 162. filter; 163. iron remover; 171. second control valve; 172. diaphragm pump; 181. fourth control valve; 191. third control valve;

[0039] 2. Sewage main. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] Combine the following Figure 1 to Figure 2 , the sand mill production line provided by the embodiment of the utility model is described in detail through specific embodiments and application scenarios.

[0042] In some embodiments, Figure 1 and Figure 2 As shown, this embodiment provides a sand mill production line 1, including: a hot water tank 11, a plate heat exchanger 12, a sand mill 13, a blockage detection device 14 and a controller 15.

[0043] The inlet end of the plate heat exchanger 12 is selectively connected to the hot water tank 11 , and the outlet end of the plate heat exchanger 12 is connected to the sand mill 13 .

[0044] The blockage detection device 14 is installed on a pipeline connected to the plate heat exchanger 12 and is used to detect whether the plate heat exchanger 12 is blocked.

[0045] The blockage detection device 14 is connected to the controller 15. When the blockage detection device 14 detects blockage, the controller 15 is used to control the connection between the hot water tank 11 and the plate heat exchanger 12 so as to flush the plate heat exchanger 12 with hot water.

[0046] It is understandable that the hot water tank 11 is a buffer tank. A pure water access pipe is provided at the top of the hot water tank 11. Pure water is introduced into the hot water tank 11 from a pure water source. Hot water can be introduced directly, or cold water can be introduced and heated to hot water in the hot water tank 11.

[0047] The sand mill 13 grinds, mixes, disperses and other processes the material to prepare lithium iron phosphate. Before the material enters the sand mill 13, it needs to be heated by the plate heat exchanger 12. The sticky substances such as sticky glucose in the material are easy to adhere to the inner wall of the plate heat exchanger 12, causing the plate heat exchanger 12 to be blocked. Only hot water cleaning can dissolve the sticky substances and restore the inner wall of the plate heat exchanger 12 to a smooth passage.

[0048] Specifically, the blockage detection device 14 may be a flow meter, a speed meter, or a pressure sensor, and the controller 15 may be a PLC controller or a single-chip microcomputer.

[0049] When the blockage detection device 14 does not detect that the plate heat exchanger 12 is blocked, the hot water tank 11 and the plate heat exchanger 12 are disconnected, the sand mill 13 is in normal operation, and the material conveying channel before the plate heat exchanger 12 continues to convey material to the plate heat exchanger 12. The heated material is conveyed from the plate heat exchanger 12 to the sand mill 13 and processed in the sand mill 13.

[0050] When the blockage detection device 14 detects that the plate heat exchanger 12 is blocked, the blockage detection device 14 feeds back a blockage signal to the controller 15. The controller 15 controls the conduction between the hot water tank 11 and the plate heat exchanger 12, and controls the closing of the material conveying channel. The hot water in the hot water tank 11 enters the plate heat exchanger 12 for flushing until the blockage detection device 14 feeds back a signal of no blockage, and the cleaning process of the plate heat exchanger 12 is completed.

[0051] Compared with the traditional method of relying on manual observation to see if the plate heat exchanger 12 is blocked, the plate heat exchanger 12 can only be observed when it is seriously blocked. The operator can only disassemble and clean the plate heat exchanger 12. The disassembly and installation workload of the plate heat exchanger 12 is huge, and the disassembly will also cause a large amount of material in the plate heat exchanger 12 to be wasted. The utility model monitors the plate heat exchanger 12 in real time based on the blockage detection device 14. When a slight blockage is found, it is flushed immediately. By flushing the plate heat exchanger 12 in small amounts and multiple times, serious blockage of the plate heat exchanger 12 is avoided.

[0052] The sand mill production line 1 provided by the utility model is provided with a hot water tank 11 on the sand mill production line 1, and a blockage detection device 14 is provided on the pipeline connected with the plate heat exchanger 12. When the blockage detection device 14 feeds back a blockage signal, the controller 15 controls the conduction between the hot water tank 11 and the plate heat exchanger 12, and the hot water in the hot water tank 11 flushes the inner wall of the plate heat exchanger 12 until the blockage detection signal detects no blockage signal. The controller 15 controls the shutoff of the hot water tank 11 and the plate heat exchanger 12, and the plate heat exchanger 12 resumes the connection with the material conveying channel and the sand mill 13, and the sand mill is resumed. The utility model can monitor the blockage state of the plate heat exchanger 12 in real time when the inner wall of the plate heat exchanger 12 is slightly blocked, and automatically switch to the normal working state of the sand mill production line 1 after flushing. The flushing process of the plate heat exchanger 12 is short and has no effect on the normal operation of the sand mill 13. It avoids the disassembly and installation of the plate heat exchanger 12 and the waste of materials, realizes the automatic cleaning of the plate heat exchanger 12 during the operation of the sand mill 13, and improves the production efficiency of the sand mill production line and the degree of automation of the sand mill production line.

[0053] In some embodiments, Figure 1 and Figure 2 As shown, the sand mill production line 1 of this embodiment also includes: a first material pipeline 16 and a hot water pipeline 17.

[0054] The first material pipeline 16 is used to input materials into the plate heat exchanger 12 . One end of the hot water pipeline 17 is connected to the hot water tank 11 , and the other end of the hot water pipeline 17 is connected to the first material pipeline 16 .

[0055] The first material pipeline 16 is equipped with a first control valve 161, and the hot water pipeline 17 is equipped with a second control valve 171;

[0056] The controller 15 is connected to the first control valve 161 and the second control valve 171 ; the controller 15 is used to control one of the first control valve 161 and the second control valve 171 to be turned on while the other one is turned off.

[0057] It is understandable that the first control valve 161 is used to control the on-off of the first material pipeline 16 , and the second control valve 171 is used to control the on-off of the hot water pipeline 17 .

[0058] When the sand mill production line 1 operates normally, the controller 15 controls the hot water pipeline 17 to be turned off and the first material pipeline 16 to be turned on. The first material pipeline 16 transports the material from the material source to the plate heat exchanger 12. The material is heated in the plate heat exchanger 12 and then sent to the sand mill 13 for processing.

[0059] When the plate heat exchanger 12 is blocked, the controller 15 controls the hot water pipe 17 to be turned on and the first material pipe 16 to be turned off. At this time, the cleaning operation of the plate heat exchanger 12 is started, and no material is transported to the plate heat exchanger 12. The hot water in the hot water tank 11 is sent into the plate heat exchanger 12 to flush the inner wall of the plate heat exchanger 12 and clear the blockage until the plate heat exchanger 12 is restored to a smooth state.

[0060] Specifically, the first control valve 161 and the second control valve 171 may be straight-through electrically controlled valves.

[0061] In this embodiment, a first control valve 161 is set on the first material pipeline 16, a second control valve 171 is set on the hot water pipeline 17, and a controller 15 is used to control one of the first control valve 161 and the second control valve 171 to be turned on and the other to be turned off, thereby realizing automatic switching of the first material pipeline 16 and the hot water pipeline 17 without manual intervention, thereby improving work efficiency.

[0062] In some embodiments, Figure 1 and Figure 2 As shown, the hot water tank 11 of this embodiment is equipped with a heating element 111 and a temperature sensor 112 .

[0063] The heating element 111 is installed at the bottom of the hot water tank 11 , and the temperature sensor 112 is installed at the hot water tank 11 . The temperature sensor 112 is connected to the controller 15 , and the controller 15 is connected to the heating element 111 .

[0064] It is understandable that the cold water introduced into the hot water tank 11 is heated by the heating element 111 so that the cold water is heated to a preset temperature, and the hot water at the preset temperature can dissolve viscous substances such as glucose adhering to the inner wall of the plate heat exchanger 12. In this embodiment, the temperature sensor 112 is used to detect the temperature of the hot water in the hot water tank 11, and the temperature information is fed back to the controller 15. When the temperature of the hot water reaches a preset value, the controller 15 controls the heating element 111 to stop heating. When the temperature of the hot water does not reach the preset temperature, the controller 15 controls the heating element 111 to start heating.

[0065] Specifically, the preset temperature is 70°C to 80°C.

[0066] Specifically, the temperature sensor 112 may be a thermal resistor, and the heating element 111 may be an electric heating wire or an electric heating coil.

[0067] In this embodiment, a heating element 111 and a temperature sensor 112 are provided in the hot water tank 11. The temperature sensor 112 detects the water temperature in the hot water tank 11. The controller 15 controls the start and stop of the heating element 111 according to the comparison between the water temperature and a preset temperature, thereby realizing automatic control of the water temperature in the hot water tank 11 and ensuring the reliability of the water temperature of the hot water output by the hot water tank 11.

[0068] In some embodiments, Figure 1 and Figure 2 As shown, the hot water tank 11 of this embodiment is provided with a water level gauge 113 .

[0069] The water level meter 113 is installed on the top of the hot water tank 11 , and the water level meter 113 is connected to the controller 15 .

[0070] It can be understood that hot water is introduced into the hot water tank 11 from the water source, a control valve is provided on the pipeline between the water source and the hot water tank 11, the controller 15 is connected to the control valve, the water level meter 113 is used to detect the water level in the hot water tank 11, and feed back the water level information in the hot water tank 11 to the controller 15. When the water level is too low, the controller 15 controls the control valve to open, and continuously introduces pure water into the hot water tank 11. When the water level is too high, there is a risk of overflow, and the controller 15 controls the control valve to close.

[0071] Specifically, the water level meter 113 may be an ultrasonic liquid level sensor.

[0072] In this embodiment, a water level gauge 113 is provided in the hot water tank 11. The water level in the hot water tank 11 is detected by the water level gauge 113. The controller 15 controls the opening and closing of the valve according to the water level control, thereby realizing automatic replenishment of pure water in the hot water tank 11 and avoiding the risk of overflow of the hot water tank 11, which is beneficial to the automatic control of the water level in the hot water tank 11.

[0073] In some embodiments, Figure 1 and Figure 2 As shown, the hot water pipe 17 of this embodiment is installed with a diaphragm pump 172.

[0074] The diaphragm pump 172 pumps the hot water in the hot water tank 11 into the plate heat exchanger 12 .

[0075] It is understandable that the diaphragm pump 172 is used to pump the hot water in the hot water tank 11 to the plate heat exchanger 12. The diaphragm pump 172 realizes the transportation of hot water based on the compression and release of the diaphragm. The controller 15 of this embodiment is connected to the diaphragm pump 172. When the hot water tank 11 and the plate heat exchanger 12 are in conduction, the controller 15 controls the diaphragm pump 172 to pump the hot water.

[0076] Since the diaphragm pump 172 uses compressed air as a power source, no additional electrical energy is required, and the structure is simple and maintenance is convenient, which is more conducive to installation and use in the sand mill production line 1.

[0077] In some embodiments, Figure 1 As shown, a filter 162 and an iron remover 163 are installed on the first material pipeline 16 of this embodiment.

[0078] Along the flow direction of the material in the first material pipeline 16 , the filter 162 and the iron remover 163 are located after the inlet of the hot water pipeline 17 .

[0079] It is understandable that the filter 162 and the iron remover 163 of this embodiment are provided with two channels, one for use and one for backup, and each channel is provided with a filter 162 and two iron removers 163. During the operation of the sand mill production line 1, the filter 162 and the iron remover 163 of the backup channel can be disassembled and cleaned, and then installed. In this embodiment, the filter 162 and the iron remover 163 are arranged after the hot water inlet of the first material channel. Before the hot water pump is sent into the plate heat exchanger 12, the filter 162 and the iron remover 163 can be flushed with hot water without disassembling and cleaning the filter 162 and the iron remover 163, thereby avoiding the disassembly and installation work of the operator and improving the production efficiency of the sand mill production line 1.

[0080] In some embodiments, Figure 1 and Figure 2 As shown, the sand mill production line 1 of this embodiment further includes: a second material pipeline 18; the second material pipeline 18 is connected to the plate heat exchanger 12 and the sand mill 13 respectively.

[0081] The clogging detection device 14 includes a first flow meter 141 and a second flow meter 142 .

[0082] The first flow meter 141 is disposed on the first material pipeline 16 , and the second flow meter 142 is disposed on the second material pipeline 18 .

[0083] The first flow meter 141 and the second flow meter 142 are respectively connected to the controller 15 . When the difference between the first flow meter 141 and the second flow meter 142 exceeds a preset value, the controller 15 controls the hot water pipe 17 to be connected to the first material pipe 16 .

[0084] It is understandable that the flow values ​​of the first flow meter 141 and the second flow meter 142 are different, that is, the inlet flow and outlet flow of the plate heat exchanger 12 are different, which means that there is a blockage inside the plate heat exchanger 12. The larger the difference between the first flow meter 141 and the second flow meter 142, the more serious the blockage of the plate heat exchanger 12.

[0085] The degree of blockage of the plate heat exchanger 12 is determined based on the difference between the first flow meter 141 and the second flow meter 142. When the difference between the first flow meter 141 and the second flow meter 142 exceeds a preset value, the flushing of the plate heat exchanger 12 is started. The difference in flow rate can accurately characterize the blockage of the plate heat exchanger 12, thereby achieving the effect of accurately determining the blockage of the plate heat exchanger 12.

[0086] Specifically, the first flow meter 141 can be set at one end of the first material pipeline 16 close to the plate heat exchanger 12, and the second flow meter 142 can be set at one end of the second material pipeline 18 close to the plate heat exchanger 12, which is more conducive to accurate monitoring of the inlet flow and outlet flow of the plate heat exchanger 12.

[0087] In some embodiments, Figure 1 and Figure 2 As shown, the sand mill production line 1 of this embodiment also includes a sewage pipe 19.

[0088] One end of the sewage pipe 19 is connected to the second material pipe 18 , and the other end is connected to the sewage main pipe 2 .

[0089] The sewage pipe 19 is provided with a third control valve 191 , the second material pipe 18 is provided with a fourth control valve 181 , and the third control valve 191 and the fourth control valve 181 are connected to the controller 15 .

[0090] It is understandable that after flushing the plate heat exchanger 12, the mixture of material and flushing water in the second material pipeline 18 is judged by the operator whether it meets the material requirements of the sand mill 13. The mixture that meets the requirements is input into the sand mill 13 for normal processing, and the mixture that does not meet the requirements is discharged into the sewage main pipe 2 through the sewage pipe 19.

[0091] According to the processing path of the mixture, when the mixture is transported into the sand mill 13, the controller 15 controls the third control valve 191 to close and the fourth control valve 181 to open; when the mixture is transported into the sewage main 2, the controller 15 controls the third control valve 191 to open and the fourth control valve 181 to close.

[0092] Specifically, the third control valve 191 and the fourth control valve 181 may be direct-through electrically controlled valves.

[0093] In this embodiment, a sewage pipe 19 is provided, and a third control valve 191 is provided on the sewage pipe 19, and a fourth control valve 181 is provided on the second material pipe 18. The controller 15 opens one of the third control valve 191 and the fourth control valve 181 and closes the other, thereby controlling the mixture of material and flushing water in the plate heat exchanger 12 to be discharged into the sand mill 13 or into the sewage pipe, thereby realizing automatic control of the sewage pipe 19 and the second material pipe 18.

[0094] In some embodiments, Figure 1 As shown, the sand mill production line 1 of this embodiment further includes a hot water circulation pipeline 20 .

[0095] One end of the hot water circulation pipe 20 is communicated with the sewage pipe 19 , and the other end is communicated with the hot water tank 11 .

[0096] It is understandable that, if the mixture containing materials and flushing water after flushing through the plate heat exchanger 12 does not meet the processing requirements for entering the sand mill 13, in addition to being discharged into the sewage main 2 through the sewage pipe 19, it can also be sent back to the hot water tank 11 for the next flushing.

[0097] In this embodiment, by setting up a hot water circulation pipe 20, the mixture after flushing in the plate heat exchanger 12 can be sent back to the hot water tank 11. After the hot water tank 11 reheats the flushing water, it can be input into the plate heat exchanger 12 again for flushing operation, thereby realizing the recycling of hot water, improving the material recovery rate, saving water resources, and realizing the comprehensive utilization of energy.

[0098] In some embodiments, Figure 1 and Figure 2 As shown, a three-way electric control valve 21 is disposed at the connection between the sewage pipe 19 and the hot water circulation pipe 20 of this embodiment.

[0099] The three-way electric-controlled valve 21 is connected to the controller 15 .

[0100] It is understandable that the connection between the sewage pipe 19 and the hot water circulation pipe 20 is composed of a sewage inlet channel and two outlet channels, one of which leads to the hot water circulation pipe 20 and the other leads to the sewage main pipe 2.

[0101] In order to control the on-off of the three channels respectively, the present embodiment adopts a three-way electrically controlled valve 21 for on-off control. When it is necessary to send the mixture of materials and flushing water back to the hot water tank 11, the controller 15 controls the inlet channel of the three-way electrically controlled valve 21 and the channel leading to the hot water circulation pipe 20 to be opened, and the channel leading to the sewage main pipe 2 is closed; when it is necessary to discharge the mixture of materials and flushing water into the sewage main pipe 2, the controller 15 controls the inlet channel of the three-way electrically controlled valve 21 and the channel leading to the sewage main pipe 2 to be opened, and the channel leading to the hot water circulation pipe 20 is closed.

[0102] This embodiment configures a three-way electric-controlled valve 21 at the connection between the sewage pipe 19 and the hot water circulation pipe 20. Based on the characteristics of the three-way electric-controlled valve 21, such as fast response speed, high control accuracy and good reliability, it realizes precise control of the flow direction and flow rate of the mixture of materials and flushing water.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A sand mill production line, characterized in that: include: Hot water tanks, plate heat exchangers, sand mills, blockage detection devices and controllers; The inlet end of the plate heat exchanger is selectively connected to the hot water tank, and the outlet end of the plate heat exchanger is connected to the sand mill; The blockage detection device is installed on a pipe connected to the plate heat exchanger, and is used to detect whether the plate heat exchanger is blocked; The blockage detection device is connected to the controller. When the blockage detection device detects blockage, the controller is used to control the conduction between the hot water tank and the plate heat exchanger to flush the plate heat exchanger with hot water.

2. The sand mill production line according to claim 1, characterized in that: Also includes: First material pipeline and hot water pipeline; The first material pipeline is used to input materials into the plate heat exchanger, one end of the hot water pipeline is connected to the hot water tank, and the other end of the hot water pipeline is connected to the first material pipeline; The first material pipeline is equipped with a first control valve, and the hot water pipeline is equipped with a second control valve; The controller is connected to the first control valve and the second control valve; the controller is used to control the first control valve and the second control valve so that when one of the first control valve and the second control valve is turned on, the other one is turned off.

3. The sand mill production line according to claim 1, characterized in that: The hot water tank is equipped with a heating element and a temperature sensor; The heating element is installed at the bottom of the hot water tank, the temperature sensor is installed at the hot water tank, the temperature sensor is connected to the controller, and the controller is connected to the heating element.

4. The sand mill production line according to claim 1, characterized in that: The hot water tank is provided with a water level gauge; The water level meter is installed on the top of the hot water tank, and the water level meter is connected to the controller.

5. The sand mill production line according to claim 2, characterized in that: The hot water pipeline is equipped with a diaphragm pump; The diaphragm pump pumps the hot water in the hot water tank into the plate heat exchanger.

6. The sand mill production line according to claim 2, characterized in that: A filter and an iron remover are installed on the first material pipeline; Along the flow direction of the material in the first material pipeline, the filter and the iron remover are located after the inlet of the hot water pipeline.

7. The sand mill production line according to claim 2, characterized in that: Also includes: A second material pipeline; the second material pipeline is connected to the plate heat exchanger and the sand mill respectively; The clogging detection device includes a first flow meter and a second flow meter; The first flow meter is arranged on the first material pipeline, and the second flow meter is arranged on the second material pipeline; The first flow meter and the second flow meter are connected to the controller respectively. When the difference between the first flow meter and the second flow meter exceeds a preset value, the controller controls the hot water pipeline to be connected to the first material pipeline.

8. The sand mill production line according to claim 7, characterized in that: It also includes sewage pipes; One end of the sewage pipe is connected to the second material pipe, and the other end is connected to the sewage main pipe; The sewage pipe is provided with a third control valve, the second material pipe is provided with a fourth control valve, and the third control valve and the fourth control valve are connected to the controller.

9. The sand mill production line according to claim 8, characterized in that: It also includes hot water circulation pipes; One end of the hot water circulation pipe is connected to the sewage pipe, and the other end is connected to the hot water tank.

10. The sand mill production line according to claim 9, characterized in that: A three-way electric control valve is arranged at the connection between the sewage pipe and the hot water circulation pipe; The three-way electrically controlled valve is connected to the controller.

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