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CN-121491859-B - Automatic mating and grinding process and system for valve plate and valve seat of flat gate valve

CN121491859BCN 121491859 BCN121491859 BCN 121491859BCN-121491859-B

Abstract

The invention relates to the technical field of flat gate valves and discloses an automatic mating and grinding process and system for valve plates and valve seats of flat gate valves, comprising the following steps of preprocessing, namely selecting valve plates and valve seats of the flat gate valves, wherein the valve plates and the valve seats are made of stainless steel or alloy steel, degreasing, cleaning and drying the valve plates and the valve seats; the automatic grinding system integrates a multi-axis industrial robot, a high-precision grinding disc and a multi-dimensional sensor group, and a PLC (programmable logic controller) performs centralized closed-loop control, so that the contact pressure and the relative motion track between a valve plate and a valve seat can be regulated and controlled in real time, the grinding force is ensured to be uniformly distributed on a sealing surface, the motion track is strictly executed according to a preset path, the pressure non-uniformity and track deviation caused by the uncertainty of manual operation are avoided, the high-precision anastomosis between the valve plate and the sealing surface of the valve seat is ensured, and the sealing reliability of the flat gate valve is improved.

Inventors

  • DING XUEFENG
  • LI BO
  • CAI LEI
  • LI QUN

Assignees

  • 盐城奥凯明通阀门有限公司

Dates

Publication Date
20260508
Application Date
20251117

Claims (8)

  1. 1. The automatic mating and grinding process for the valve plate and the valve seat of the flat gate valve is characterized by comprising the following steps of: firstly, preprocessing, namely selecting a valve plate and a valve seat of a flat gate valve, wherein the valve plate and the valve seat are made of stainless steel or alloy steel, degreasing, cleaning and drying the valve plate and the valve seat; preparing a matched grinding fluid, namely preparing the matched grinding fluid, wherein the matched grinding fluid is prepared from the following raw materials, by weight, 40-60 parts of diamond abrasive, 20-30 parts of alumina abrasive, 10-15 parts of chemical activator, 5-10 parts of dispersing agent and 100-150 parts of deionized water; the chemical activator is prepared by selecting citric acid, oxalic acid and a corrosion inhibitor, mixing the citric acid, the oxalic acid and the corrosion inhibitor according to a mass ratio of 3:2:1, adding the mixture into a reaction kettle, and stirring the mixture for 1 to 2 hours at 50 to 70 ℃ to obtain the chemical activator, wherein the corrosion inhibitor adopts one of benzotriazole or sodium molybdate; The dispersing agent is added in batches, namely 60 to 70 percent of the total consumption of the dispersing agent and the diamond abrasive and the alumina abrasive are added into high-speed stirring equipment for first-stage stirring, and after deionized water is added, the rest 30 to 40 percent of the dispersing agent is added at a constant speed in the process of increasing the rotating speed to 1000 to 1500r/min, wherein the total stirring time in the whole process is 30 to 40 minutes; step three, automatic match grinding treatment, namely mounting the pretreated valve plate and valve seat on automatic match grinding equipment, adjusting match grinding parameters through a control system, and applying match grinding liquid to match the match grinding, wherein the match grinding parameters comprise pressure, rotating speed and time; Step four, post-processing, namely performing ultrasonic cleaning, drying and surface detection on the valve plate and the valve seat which are subjected to matched grinding to obtain a valve plate and valve seat assembly with high matching degree; In the third step, the automatic grinding equipment comprises a multi-axis robot, a grinding disc, a liquid supply system and a sensor system, wherein the grinding is carried out in a closed environment, the temperature is controlled at 20-30 ℃, and the humidity is controlled at 40-60%.
  2. 2. The automatic mating and grinding process for the valve plate and the valve seat of the flat gate valve is characterized in that the pretreatment in the first step comprises the following steps of immersing the valve plate and the valve seat in a stainless steel tank containing degreasing liquid for 1-2 hours at normal temperature, performing auxiliary cleaning by using an ultrasonic generator at the frequency of 40-60kHz in the immersing process, taking out after the immersing is finished, flushing for 10-15 minutes by deionized water, and then drying in an oven at the temperature of 60-80 ℃ for 1-2 hours.
  3. 3. The automatic mating and grinding process for the valve plate and the valve seat of the flat gate valve according to claim 2, wherein the degreasing fluid consists of sodium hydroxide, a surfactant and deionized water, the mass ratio of the sodium hydroxide to the surfactant to the deionized water is 1:0.5:10, the concentration of the sodium hydroxide is 5% -10%, and the surfactant is one of sodium dodecyl benzene sulfonate or fatty alcohol polyoxyethylene ether.
  4. 4. The automatic grinding process for the valve plate and the valve seat of the flat gate valve according to claim 1, wherein the preparation of the grinding fluid in the second step comprises the following steps of adding diamond grinding materials and aluminum oxide grinding materials into high-speed stirring equipment, controlling the temperature to be 25-35 ℃, stirring for 20-30 minutes at 500-800r/min, adding a chemical activator and a dispersing agent, continuously stirring for 15-20 minutes, finally adding deionized water, increasing the rotating speed to 1000-1500r/min, and stirring for 30-40 minutes to obtain the uniform grinding fluid.
  5. 5. The automatic grinding process for the valve plate and the valve seat of the flat gate valve is characterized in that the automatic grinding process in the third step comprises the following steps of fixing the valve plate on a grinding disc, clamping the valve seat by a multi-axis robot, starting the grinding disc to rotate at 100-200r/min after grinding liquid is applied, simultaneously controlling the valve seat to contact the valve plate by the robot at 5-10N pressure, enabling the grinding time to be 30-60 minutes, monitoring the surface roughness in real time through a sensor system in the grinding process, and feeding back the adjustment parameters.
  6. 6. The automatic mating and grinding process for the valve plate and the valve seat of the flat gate valve according to claim 5, wherein the sensor system comprises a laser displacement sensor and a temperature sensor, the laser displacement sensor is used for measuring the gap of the valve plate and the valve seat, the precision is 0.1 μm, and the temperature sensor is used for monitoring the temperature of a mating and grinding interface, and the control range is 20-30 ℃.
  7. 7. The automatic mating and grinding process for the valve plate and the valve seat of the flat gate valve is characterized in that the post-treatment in the fourth step comprises the following steps of placing a valve plate and valve seat assembly after mating and grinding into an ultrasonic cleaning machine, cleaning for 10-15 minutes by using a mixed solvent of acetone and ethanol, drying for 30 minutes at 50-60 ℃, and finally detecting the surface profile by using a three-coordinate measuring machine, so that the flatness error is ensured to be less than 0.01mm.
  8. 8. An automatic mating and grinding system for a valve plate and a valve seat of a flat gate valve, which is used for implementing the automatic mating and grinding process for the valve plate and the valve seat of the flat gate valve according to any one of claims 1-7, and is characterized by comprising a pretreatment module, a mating and grinding liquid preparation module, an automatic mating and grinding module and a post-treatment module; the pretreatment module comprises a degreasing tank, an ultrasonic cleaner and a drying box; the grinding fluid preparation module comprises a material mixing tank, a stirrer and a temperature control system; the automatic grinding distribution module comprises a multi-axis robot, a grinding distribution disc, a liquid supply pump, a sensor group and a PLC controller; the post-processing module comprises an ultrasonic cleaner, an oven and a detecting instrument; the PLC is connected with the sensor group, the robot and the auxiliary grinding disc to realize closed-loop control.

Description

Automatic mating and grinding process and system for valve plate and valve seat of flat gate valve Technical Field The invention relates to the technical field of flat gate valves, in particular to an automatic mating and grinding process and system for a valve plate and a valve seat of a flat gate valve. Background The flat gate valve is a sliding valve with parallel gate plates as the closing member, which may be a single gate plate or a double gate plate with a spreader mechanism therebetween, the pressing force of the gate plate against the valve seat being controlled by the pressure of the medium acting on the floating gate plate or the floating valve seat. At present, in the process of the mating and grinding of a flat gate valve plate and a valve seat, as the traditional mating and grinding process mainly relies on the experience of operators to carry out manual grinding, the contact pressure and the relative movement track between the valve plate and the valve seat in the process of mating and grinding cannot be accurately controlled in real time, and when the mating and grinding pressure is uneven or the movement track deviates, the degree of fit of the sealing surfaces of the valve plate and the valve seat is insufficient, the sealing performance of the gate valve is affected, and medium leakage is caused. Therefore, an automatic mating and grinding process and system for the valve plate and the valve seat of the flat gate valve are provided to solve the problems. Disclosure of Invention Aiming at the defects of the prior art, the invention provides an automatic mating and grinding process and an automatic mating and grinding system for a valve plate and a valve seat of a flat gate valve. In order to achieve the purpose, the invention provides the following technical scheme for realizing the automatic mating and grinding process and system of the valve plate and the valve seat of the flat gate valve, wherein the automatic mating and grinding process and system comprise the following steps: Firstly, preprocessing, namely selecting a valve plate and a valve seat of a flat gate valve, wherein the valve plate and the valve seat are made of stainless steel or alloy steel, degreasing, cleaning and drying the valve plate and the valve seat; Preparing a matched grinding fluid, namely preparing the matched grinding fluid, wherein the matched grinding fluid is prepared from the following raw materials, by weight, 40-60 parts of diamond abrasive, 20-30 parts of alumina abrasive, 10-15 parts of chemical activating agent, 5-10 parts of dispersing agent and 100-150 parts of deionized water; Step three, automatic match grinding treatment, namely mounting the pretreated valve plate and valve seat on automatic match grinding equipment, adjusting match grinding parameters by a control system, and applying match grinding liquid to match grinding, wherein the match grinding parameters comprise pressure, rotating speed and time; Step four, post-processing, namely performing ultrasonic cleaning, drying and surface detection on the valve plate and the valve seat which are subjected to matched grinding to obtain a valve plate and valve seat assembly with high matching degree; In the third step, the automatic grinding equipment comprises a multi-axis robot, a grinding disc, a liquid supply system and a sensor system, the grinding is carried out in a closed environment, the temperature is controlled at 20-30 ℃, and the humidity is controlled at 40-60%. Preferably, the pretreatment in the first step comprises the steps of immersing the valve plate and the valve seat in a stainless steel tank containing degreasing fluid for 1-2 hours at normal temperature, adopting an ultrasonic generator to carry out auxiliary cleaning at 40-60kHz frequency in the immersing process, taking out the valve plate and the valve seat after the immersing is finished, flushing the valve plate and the valve seat with deionized water for 10-15 minutes, and then placing the valve plate and the valve seat in an oven for drying at 60-80 ℃ for 1-2 hours. Preferably, the degreasing fluid consists of sodium hydroxide, a surfactant and deionized water, wherein the mass ratio of the sodium hydroxide to the surfactant to the deionized water is 1:0.5:10, the concentration of the sodium hydroxide is 5% -10%, and the surfactant adopts one of sodium dodecyl benzene sulfonate or fatty alcohol polyoxyethylene ether. Preferably, the preparation of the grinding fluid in the second step comprises the steps of adding diamond grinding materials and alumina grinding materials into high-speed stirring equipment, controlling the temperature to be 25-35 ℃, stirring for 20-30 minutes at 500-800r/min, adding a chemical activating agent and a dispersing agent, continuously stirring for 15-20 minutes, finally adding deionized water, increasing the rotating speed to 1000-1500r/min, and stirring for 30-40 minutes to obtain the uniform grinding fluid. Preferably, the chemical acti