Automatic curing agent control instrument

Abstract

The utility model provides an automatic curing agent controller which comprises a curing agent storage tank, a filter, a corrosion-resistant flow pump, a frequency converter, a sand mixer, a pneumatic three-way valve and a flow monitoring alarm, the number of the curing agent storage tanks, the number of the filters, the number of the corrosion-resistant flow pumps and the number of the frequency converters are all two. Each filter is respectively connected with one curing agent storage tank and one corrosion-resistant flow pump through pipelines; the two corrosion-resistant flow pumps are connected with a special frequency converter and a pneumatic three-way valve; the pneumatic three-way valve is also connected with the sand mixer; and the flow monitoring alarm is arranged at the pneumatic three-way valve. According to the utility model, two curing agents can be simultaneously controlled to act on a working object, and corresponding gears are selected to control different dosages of the two curing agents according to field use requirements, so that the hardening speed meets production use requirements. According to the utility model, the PLC module is also introduced to control the curing agent automatic control instrument, so that automatic control is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to foundry molding, core making equipment structure design and application technical field, especially a kind of curing agent automatic control instrument. BACKGROUND

[0002] Currently, self-hardening sand is most widely used in the foundry industry. In the production and use process, a curing agent is usually used to adjust the curing degree of the sand block by changing the addition amount of the curing agent and adjusting the model of the curing agent to achieve the purpose of demolding within a predetermined time. The hardening speed of self-hardening sand is mainly affected by factors such as sand temperature, production environment temperature, sand size, sand structure, etc. Frequent adjustment of the addition amount of the curing agent and adjustment of the model of the curing agent cause a large amount of sand waste, and manual operation often has certain randomness and uncertainty, which will seriously affect the quality of the sand mold (core). SUMMARY

[0003] The curing agent automatic control instrument provided by the utility model uses two kinds of curing agents, including a fast curing agent and a slow curing agent. The corresponding gear can also be flexibly selected according to the on-site use requirements to control the different amounts of the two kinds of curing agents, so that the hardening speed meets the production and use requirements.

[0004] The curing agent automatic control instrument provided by the utility model has the following technical key points: it contains curing agent storage tanks 1, filters 2, corrosion-resistant flow pumps 3, frequency converters 4, analog output modules 5, PLC modules 6, multi-gear switches 7, sand mixers 8, pneumatic three-way valves 9, and flow monitoring alarms 10.

[0005] The curing agent storage tanks 1, filters 2, corrosion-resistant flow pumps 3, and frequency converters 4 are all two, and the two curing agent storage tanks 1 are respectively used to store fast curing agents and slow curing agents;

[0006] Each filter 2 is respectively connected to one curing agent storage tank 1 and one corrosion-resistant flow pump 3 through a pipeline; each corrosion-resistant flow pump 3 is connected to a dedicated frequency converter 4; and the filter 2 is used to filter impurities in the curing agent.

[0007] The output ends of the two corrosion-resistant flow pumps 3 are respectively connected to the pneumatic three-way valve 9 through a pipeline; the pneumatic three-way valve 9 is also connected to the sand mixer 8; and one end of the pneumatic three-way valve 9 is connected to the loop pipeline connected to the curing agent storage tank 1.

[0008] The flow monitoring alarm 10 is arranged at the pneumatic three-way valve 9. The flow monitoring alarm 10 adopts a PVDF flow monitoring alarm, monitors the curing agent flow in real time, and alarms through sound and light when the flow is abnormal, so as to avoid quality problems of the sand mold. The PVDF flow monitoring alarm can select an inserted multi-parameter turbine flowmeter, the meter head can rotate by 360 degrees, so that the viewing angle can be adjusted during on-site installation; the wiring mode is generally that the gray wire is connected to the positive power supply and the brown wire is connected to the negative power supply; the flowmeter is suitable for corrosive working conditions such as strong acid and strong base. When actually selecting the flow monitoring alarm, the following factors also need to be considered: characteristics of the measured medium, working pressure, temperature range, accuracy requirement, installation mode, output signal requirement and the like.

[0009] Each constituent unit is connected with a power supply.

[0010] The curing agent automatic control instrument, the preferred technical content to be protected is that the opening / closing of the pneumatic three-way valve 9 is controlled by the working or not of the sand mixer 8;

[0011] The curing agent automatic control instrument is further provided with an analog output module 5, a PLC module 6 and a multi-gear conversion switch 7; wherein: the two frequency converters 4 are simultaneously connected with the analog output module 5; the analog output module 5 and the multi-gear conversion switch 7 are respectively connected with the PLC module 6.

[0012] The curing agent automatic control instrument further satisfies the following requirements:

[0013] When the sand mixer 8 normally works, the curing agent flows to the sand mixer 8 for sand mixing, and when the sand mixer 8 stops, the curing agent flows back to the curing agent storage tank 1;

[0014] The operator sets the gear position through the multi-gear conversion switch 7 on the control panel, the PLC module 6 compares the stored data to determine the required curing agent addition amount data output analog signal, then transmits the analog signal to the analog output module 5, the analog output module 5 converts the analog signal into an electric signal and transmits it to the frequency converter 4, the frequency converter 4 converts the electric signal into an electric frequency and outputs it to the corrosion-resistant flow pump 3, the speed of the corrosion-resistant flow pump 3 is adjusted, the corrosion-resistant flow pump 3 outputs the curing agent with a fixed flow, the flow monitoring alarm 10 detects the curing agent flow and transmits the data to the PLC module 6, the PLC module 6 compares the data with the stored data, and when the data deviation exceeds a fixed value, the alarm alarms to remind the operator to repair the equipment. The control system is integrated and easy to operate: the control system adopts a Siemens S7-1200 and above version PLC to write a program control, controls the frequency converter through the analog output module, and adjusts the corrosion-resistant flow pump to control the weight ratio of the two curing agents. The gear flow input adopts a touch screen input, and the flow control adopts a multi-gear conversion switch control.

[0015] The corrosion-resistant flow pump 3 is made of PVDF, which is corrosion-resistant and wear-resistant, and the service life is 10 times that of ordinary PVC. The mechanical diaphragm metering pump cancels the non-measuring diaphragm guard, reduces the pressure and flow pulse degree, and has a steady-state accuracy of ±1% of the rated flow within the flow range of 10%-100%.

[0016] The corrosion-resistant flow pump 3 is a GW or GS series mechanical diaphragm metering pump of Nanfang Pump Industry Co., Ltd. The maximum flow is 53L / H, the maximum discharge pressure can reach 10bar, the regulation ratio is 10:1, the steady-state accuracy is ±2%, the maximum suction lift is 1.5m water column, the maximum environmental temperature is +40℃, and the maximum inlet pressure is 1bar. The pump head material can be selected from PVC, PVDF, 316SS and the like. The application range of the corrosion-resistant flow pump 3 includes reverse osmosis (ultrafiltration), industrial water and wastewater, swimming pools, seawater desalination and various water treatment processes.

[0017] The PLC module 6 is a Siemens S7-1200 and above PLC, and the power supply of the curing agent automatic control instrument is a Siemens PM1207 power module, which can be used for a long time under high dust conditions and has high stability.

[0018] The corrosion-resistant flow pump 3 is provided with a filter at the front end, and the filter 2 is made of PVDF material, which is corrosion-resistant and has a long service life. The filtered curing agent is cleaner, which can effectively prevent the corrosion-resistant flow pump 3 from being blocked.

[0019] The sand mixer 8 is provided with a pneumatic three-way valve 9, and when the sand mixer 8 temporarily stops working, the curing agent is circulated back to the curing agent storage tank 1, so that the use stability of the curing agent automatic control instrument can be ensured.

[0020] The utility model can control two kinds of curing agents to act on the working object at the same time, and can select corresponding gear positions according to the use requirements on site to control different dosages of the two kinds of curing agents, so that the hardening speed meets the production and use requirements. The utility model also introduces a PLC module to control the curing agent automatic control instrument, and the PLC module is a Siemens S7-200 PLC, and the control function is designed according to actual engineering requirements. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the schematic diagram of the principle of the utility model;

[0022] Figure 2 It is the schematic diagram of the principle of the utility model. DETAILED DESCRIPTION

[0023] The attached diagram is labeled as follows: 1. Curing agent storage tank; 2. Filter; 3. Corrosion-resistant flow pump; 4. Frequency converter; 5. Analog output module; 6. PLC module; 7. Multi-stage selector switch; 8. Sand mixer; 9. Pneumatic three-way valve; 10. Flow monitoring alarm.

[0024] The present invention will be further described below with reference to the embodiments and the accompanying drawings, but is not limited thereto.

[0025] Example 1

[0026] An automatic controller for curing agents, such as Figure 1 , Figure 2 As shown, this automatic curing agent controller uses two types of curing agents, A and B, including one fast-curing agent and one slow-curing agent. It can also flexibly select the appropriate setting according to on-site requirements, controlling different amounts of the two curing agents to ensure the curing speed meets production requirements.

[0027] The automatic controller for the curing agent includes a curing agent storage tank 1, a filter 2, a corrosion-resistant flow pump 3, a frequency converter 4, an analog output module 5, a PLC module 6, a multi-range selector switch 7, a sand mixer 8, a pneumatic three-way valve 9, and a flow monitoring alarm 10; wherein:

[0028] There are two of each: curing agent storage tank 1, filter 2, corrosion-resistant flow pump 3, and frequency converter 4. The two curing agent storage tanks 1 are used to store fast curing agent and slow curing agent respectively.

[0029] Each filter 2 is connected to a curing agent storage tank 1 and a corrosion-resistant flow pump 3 via a pipeline; each corrosion-resistant flow pump 3 is connected to a dedicated frequency converter 4; the filter 2 is used to filter impurities in the curing agent; the corrosion-resistant flow pump 3 is selected from the GW or GS series mechanical diaphragm metering pump of Southern Pump Industry Co., Ltd.

[0030] The output ends of the two corrosion-resistant flow pumps 3 are connected to the pneumatic three-way valve 9 through pipelines; the pneumatic three-way valve 9 is also connected to the sand mixer 8; one end of the pneumatic three-way valve 9 is connected to the loop pipeline that connects to the curing agent storage tank 1;

[0031] The flow monitoring alarm 10 is arranged at the pneumatic three-way valve 9. The flow monitoring alarm 10 adopts a PVDF flow monitoring alarm to monitor the curing agent flow in real time, and sound and light alarm when the flow is abnormal, so as to avoid quality problems of the sand mold. The flow monitoring alarm 10 adopts a PVDF flow monitoring alarm to monitor the curing agent flow in real time, and sound and light alarm when the flow is abnormal, so as to avoid quality problems of the sand mold. The PVDF flow monitoring alarm can select a Manisha corrosion-resistant plug-in multi-parameter turbine flowmeter, the meter head can rotate by 360 degrees, which is convenient for adjusting the viewing angle during installation on site; the wiring mode is generally that the gray wire is connected to the positive power supply and the brown wire is connected to the negative power supply; the flowmeter is suitable for strong acid and strong alkali and other corrosive working conditions. When selecting the flow monitoring alarm, the following factors also need to be considered: the characteristics of the measured medium, the working pressure, the temperature range, the accuracy requirement, the installation mode, the output signal requirement, etc.

[0032] Each constituent unit is connected with a power supply.

[0033] In the curing agent automatic control instrument, the opening / closing of the pneumatic three-way valve 9 is controlled by the working or not of the sand mixer 8.

[0034] The curing agent automatic control instrument is also provided with an analog output module 5, a PLC module 6 and a multi-gear conversion switch 7; wherein the two frequency converters 4 are connected with the analog output module 5 at the same time; the analog output module 5 and the multi-gear conversion switch 7 are connected with the PLC module 6 respectively.

[0035] The curing agent automatic control instrument also meets the following requirements:

[0036] When the sand mixer 8 works normally, the curing agent flows to the sand mixer 8 for mixing sand, and when the sand mixer 8 stops, the curing agent flows back to the curing agent storage tank 1.

[0037] The operator sets the gear position through the multi-gear conversion switch 7 on the control panel, the PLC module 6 compares the stored data to determine the required curing agent addition amount data output analog signal, and then transmits the analog signal to the analog output module 5, the analog output module 5 converts the analog signal into an electric signal and transmits it to the frequency converter 4, the frequency converter 4 converts the electric signal into an electric frequency and outputs it to the corrosion-resistant flow pump 3, adjusts the rotating speed of the corrosion-resistant flow pump 3, and the corrosion-resistant flow pump 3 outputs a fixed flow of curing agent, the flow monitoring alarm 10 detects the curing agent flow and transmits the data to the PLC module 6, the PLC module 6 compares the data with the stored data, and when the data deviation exceeds a fixed value, the alarm alarms to remind the operator to repair the equipment. The control system is integrated and easy to operate: the control system adopts Siemens S7-1200 and above version PLC to write program control, controls the frequency converter through the analog output module, and adjusts the corrosion-resistant flow pump to control the weight ratio of the two curing agents. The gear flow input adopts touch screen input, and the flow control adopts multi-gear conversion switch control.

[0038] The corrosion-resistant flow pump 3 is made of PVDF, which is corrosion-resistant and wear-resistant, and its service life is 10 times that of ordinary PVC. The mechanical diaphragm metering pump eliminates the non-measuring diaphragm guard, thereby reducing the pulse degree of pressure and flow. Within the flow range of 10%-100%, the steady-state accuracy is ±1% of the rated flow.

[0039] The PLC module 6 is a Siemens S7-1200 or above PLC, and the power supply of the curing agent automatic control instrument is a Siemens PM1207 power module, which can be used for a long time under high dust conditions and has strong stability.

[0040] The corrosion-resistant flow pump 3 is provided with a filter at the front end, and the filter 2 is made of PVDF material, which is corrosion-resistant and has a long service life. The filtered curing agent is cleaner, which can effectively prevent the corrosion-resistant flow pump 3 from being blocked.

[0041] The pneumatic three-way valve 9 is installed on the sand mixer 8. When the sand mixer 8 temporarily stops working, the curing agent is circulated back to the curing agent storage tank 1, which can ensure the stable use of the curing agent automatic control instrument.

[0042] The curing agent storage tank 1 is a device for storing curing agent for production, and two curing agent storage tanks 1 store fast curing agent and slow curing agent, respectively. The filter 2 arranged on the output pipeline is used to filter impurities in the curing agent, and the output ends of the two filters 2 are connected to the corrosion-resistant flow pumps 3, respectively. The output ends of the two corrosion-resistant flow pumps 3 are connected to the pneumatic three-way valve 8, one end of the pneumatic three-way valve 8 is connected to the curing agent storage tank 1, and the other end is connected to the sand mixer 8. The opening and closing of the pneumatic three-way valve 9 is controlled by the sand mixer 7. When the sand mixer 8 is working normally, the curing agent flows to the sand mixer 8 for sand mixing, and when the sand mixer 8 stops, the curing agent flows back to the curing agent storage tank 1. The operator sets the gear position through the multi-gear switch 7 on the control panel, the PLC module 6 compares the stored data to determine the required curing agent addition data output analog signal, and then transmits the analog signal to the analog output module 5. The analog output module 5 converts the analog signal into an electrical signal and transmits it to the frequency converter 4. The frequency converter 4 converts the electrical signal into an electrical frequency output to the corrosion-resistant flow pump 3, adjusts the speed of the corrosion-resistant flow pump 3, and outputs a fixed flow of curing agent. The flow monitoring alarm 10 detects the flow of the curing agent and transmits the data to the PLC module 6. The PLC module 6 compares the data with the stored data, and when the data deviation exceeds a fixed value, the flow monitoring alarm 10 alarms to remind the operator to maintain the equipment.

[0043] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. An automatic controller for curing agents, characterized in that: It contains curing agent storage tank (1), filter (2), corrosion-resistant flow pump (3), frequency converter (4), sand mixer (8), pneumatic three-way valve (9), flow monitoring alarm (10); wherein: curing agent storage tank (1), filter (2), corrosion-resistant flow pump (3), frequency converter (4) all have 2; Each filter (2) is connected with one curing agent storage tank (1) and one corrosion-resistant flow pump (3) respectively through pipeline; each corrosion-resistant flow pump (3) is connected with special frequency converter (4); The output ends of the two corrosion-resistant flow pumps (3) are connected with pneumatic three-way valve (9) through pipeline; the pneumatic three-way valve (9) is also connected with sand mixer (8); The flow monitoring alarm (10) is arranged at the pneumatic three-way valve (9); The flow monitoring alarm (10) adopts PVDF flow monitoring alarm, specifically, it is plug-in type multi-parameter turbine flowmeter.

2. The automatic curing agent controller according to claim 1, characterized by: The curing agent automatic control instrument is also provided with analog output module (5), PLC module (6), multi-grade conversion switch (7); wherein: two frequency converters (4) are connected with analog output module (5) simultaneously; the analog output module (5) and multi-grade conversion switch (7) are connected with PLC module (6) respectively.

3. The curing agent automatic control instrument according to claim 2, characterized in that: The corrosion-resistant flow pump (3) is GW or GS series mechanical diaphragm metering pump.

4. The automatic curing agent controller according to claim 2, wherein: The PLC module (6) is Siemens S7-1200 and above PLC; the power supply of the curing agent automatic control instrument is Siemens PM1207 power module.

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