CN113526832A - Method for automatically adjusting pressing parameters and reducing mud spraying at pressing stage according to depressurization time - Google Patents
Method for automatically adjusting pressing parameters and reducing mud spraying at pressing stage according to depressurization time Download PDFInfo
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- CN113526832A CN113526832A CN202110885794.4A CN202110885794A CN113526832A CN 113526832 A CN113526832 A CN 113526832A CN 202110885794 A CN202110885794 A CN 202110885794A CN 113526832 A CN113526832 A CN 113526832A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
- B01D25/12—Filter presses, i.e. of the plate or plate and frame type
- B01D25/21—Plate and frame presses
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- Engineering & Computer Science (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Filtration Of Liquid (AREA)
Abstract
The invention discloses a method for automatically adjusting pressing parameters and reducing the sludge spraying at a pressing stage according to a pressure reduction time. The method comprises the steps of additionally detecting the squeezing initial state, judging the squeezing execution state and self-adjusting the content of related subprograms of squeezing parameters in the PLC control program of the existing plate-and-frame filter press; the subprogram is as follows: firstly, collecting the average value of the pressure drop time of the oil cylinder three times before the first stage of squeezing as a reference quantity; then, the actual oil cylinder pressure reduction time is compared with a reference amount, and squeezing parameter self-tuning is carried out according to the difference value of the actual oil cylinder pressure reduction time and the reference amount. The method can solve the problem that when the pressing object is changed in real time mainly due to the drainability of the filter cloth, the effect of conditioning the sludge and the like, the system can be automatically switched to be executed in a more appropriate state, so that one set of parameters are not changed, the parameters are not adjusted timely or completely manually, and the problems of overlong pressing time, unsatisfactory pressing effect and abnormal sludge spraying during pressing can be avoided in actual production.
Description
Technical Field
The invention belongs to the technical field of sludge dewatering, and relates to a method for automatically adjusting pressing parameters and reducing sludge spraying at a pressing stage according to a pressure reduction time.
Background
Plate and frame type filter presses are common equipment used in sludge dewatering treatment. The pressing state action of the plate-and-frame filter press is executed by depending on initially set parameters, the hydraulic station is controlled by calculation to push the head plate to generate pressure, and pressing action water filtration is executed by the rising and falling of the pressure. The squeezing parameters are generally set according to the requirements during initial debugging, the squeezing conditions are greatly different along with the use time of filter cloth, the sludge generation under different conditioning conditions and the like, the actual requirements on the site are hardly met by depending on individual parameter adjustment of operators, and abnormal conditions such as overlong squeezing time, unsatisfactory squeezing effect and even sludge spraying on the squeezing site are often caused.
The execution of the pressing state of the plate and frame filter press is according to preset parameters: the pressure of each step of squeezing, the pressure of reduction and the times of squeezing are calculated to obtain the pressure of each step of squeezing, then the head plate is pushed by an oil supply pump of the hydraulic station to press the plate frame tightly, so that the pressure of the oil cylinder rises, and after the set value of the pressure (squeezing pressure) of the oil cylinder is reached, the oil supply pump of the hydraulic station stops working; when the oil supply pump of the hydraulic station stops working, the oil cylinder pressure (squeezing pressure) starts to be reduced, and after the preset oil cylinder pressure reduction (namely the preset value of the oil cylinder pressure reduction is reached, the existing preset value of the oil cylinder pressure reduction is 1-2MPa, and the corresponding squeezing frequency set value is generally between 10-20 times) is executed, the oil supply pump of the hydraulic station works again, so that the squeezing process is carried out repeatedly. The system can only act according to preset parameters, and in actual production, because the pressing effect in the pressing stage is affected by different conditions of plate frame use time, sludge conditioning and the like, the improper parameter setting can cause overlong pressing action time and poor pressing effect, and more serious abnormal conditions such as sludge spraying in pressing can be caused, so that the pressing mode is necessarily corrected according to the conditions to make up for the deficiency.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for automatically adjusting pressing parameters according to the pressure reduction time and reducing mud spraying in the pressing stage.
The purpose of the invention is realized by the following technical scheme:
the invention relates to a method for automatically adjusting pressing parameters and reducing the sludge spraying at a pressing stage according to a depressurization time, which comprises the following steps: the method comprises the following steps of additionally detecting a squeezing initial state, judging a squeezing execution state and self-adjusting related subprogram contents of squeezing parameters in a PLC control program of the existing plate-and-frame filter press; the subprogram is as follows: firstly, collecting the average value of the pressure drop time of the oil cylinder three times before the first stage of squeezing as a reference quantity; then, the actual oil cylinder pressure reduction time is compared with a reference amount, and squeezing parameter self-tuning is carried out according to the difference value of the actual oil cylinder pressure reduction time and the reference amount.
The invention relates to a method for automatically adjusting pressing parameters and reducing the mud spraying at a pressing stage according to a depressurization time, which specifically comprises the following steps:
(1) and detecting the initial state of squeezing: collecting the time of the pressure reduction of the oil cylinder three times before the first stage of squeezing, and then taking the average value of the three as a reference quantity t;
(2) adding subprogram content in the PLC control program of the existing plate-and-frame filter press;
the additional subroutine content is as follows: (pressing parameter setting ranges are as follows:)
(wherein the unit of the set value of the cylinder pressure drop is MPa, and the unit of the set value of the number of squeezing times is times)
If the time of the pressure drop of the oil cylinder is more than or equal to the reference amount t +2 and the condition is met, the squeezing parameters are self-adjusted as follows: the pressure drop set value of the oil cylinder is n, and the squeezing times is set to be 20;
if the time of the pressure drop of the oil cylinder is greater than the reference amount t +1 and less than or equal to the reference amount t +2, and the condition is met, the squeezing parameters are self-set as follows: the pressure drop set value of the oil cylinder is n-0.5, and the squeezing frequency is set to 15;
if the time of the pressure drop of the oil cylinder is greater than the reference amount t-1 and less than or equal to the reference amount t +1, and the condition is met, the squeezing parameters are self-set as follows: the pressure drop set value of the oil cylinder is n-1, and the squeezing times are set to 12;
if the time of the pressure drop of the oil cylinder is greater than the reference amount t-2 and less than or equal to the reference amount t-1, and the condition is met, the squeezing parameters are self-set as follows: the pressure drop set value of the oil cylinder is n-2, and the squeezing times are set to 10;
if the time of the pressure drop of the oil cylinder is less than or equal to the reference amount t-2 and the condition is met, the squeezing parameters are self-adjusted as follows: the pressure drop set value of the oil cylinder is n-2.2, and the squeezing frequency is set to 8;
(3) and when the plate-and-frame filter press is operated to a squeezing state, the PLC judges the squeezing execution state according to the preset subprogram, self-sets the squeezing parameters, and executes the squeezing action according to the preset program, so that the setting of the system self-setting squeezing parameters according to the actual squeezing conditions is realized.
Further, the plate-and-frame filter press is an exclusive TCYZ-200-YG type ultrahigh pressure elastic press.
Furthermore, in the step (2), the content of a subprogram is added to a PLC control program of the existing standard YG type squeezer (the cocentre TCYZ-200-YG type ultrahigh pressure elastic squeezer); the additional subroutine content is as follows: (pressing parameter setting ranges are as follows:)
If the time of the pressure drop of the oil cylinder is more than or equal to the reference amount t +2 and the condition is met, the squeezing parameters are self-adjusted as follows: the set value of the pressure drop of the oil cylinder is 3, and the squeezing times is set to be 20;
if the time of the pressure drop of the oil cylinder is greater than the reference amount t +1 and less than or equal to the reference amount t +2, and the condition is met, the squeezing parameters are self-set as follows: the set value of the pressure drop of the oil cylinder is 2.5, and the squeezing times is 15;
if the time of the pressure drop of the oil cylinder is greater than the reference amount t-1 and less than or equal to the reference amount t +1, and the condition is met, the squeezing parameters are self-set as follows: the set value of the pressure drop of the oil cylinder is 2.0, and the squeezing times is 12;
if the time of the pressure drop of the oil cylinder is greater than the reference amount t-2 and less than or equal to the reference amount t-1, and the condition is met, the squeezing parameters are self-set as follows: the pressure drop set value of the oil cylinder is 1.0, and the squeezing times are set to 10;
if the time of the pressure drop of the oil cylinder is less than or equal to the reference amount t-2 and the condition is met, the squeezing parameters are self-adjusted as follows: the cylinder pressure drop set value was 0.8, and the number of squeezing times was set to 8.
In the invention, the working principle of the squeezing stage is as follows: the position of the head plate is controlled to move through the action of an oil supply pump of the hydraulic station, the slurry entering the plate frame filter cloth is extruded forwards, the pressure is increased once after the head plate moves forwards once, the pressure is reduced after the head plate moves forwards once, the head plate moves forwards again, and the process of higher pressure is realized, so that the extrusion effect can be ensured through the repeated design of increasing the pressure repeatedly; the process needs to be realized by setting parameters in advance, including the squeezing pressure at a certain stage, the squeezing times and the time for pressure reduction after the pressure rises to reach the preset squeezing pressure, the setting of the parameters has no unified standard and is obtained according to the experience of debugging personnel and the actual operation condition on site, meanwhile, as everyone understands the squeezing process differently, the situation that the parameter setting difference is large can occur, and it needs to be pointed out that the parameter setting is always at the beginning of a project, namely, the squeezing machine, especially the filtering effect of the filter cloth is the best, the conditions that the working condition of the squeezing machine and the effect of the filter cloth are increasingly poor can not be self-adjusted at the first time, and the conditions that the working condition of the squeezing machine and the effect of the filter cloth are increasingly poor are always after abnormal conditions (poor squeezing effect and mud spraying) occur, and manual adjustment is carried out again, and the adjustment is confirmed by further adjustment after testing, thereby bringing serious uncertain factors to the using effect of the whole squeezer.
The design of automatically adjusting parameters in the schooling area according to the pressure drop is to mainly solve the problems, the first parameter setting is uncertain, the parameter setting has no standard, and the parameters preset in the newly designed system are unified after being determined by repeated tests; secondly, as the use time goes on, the parameters are unchanged, the squeezing effect is worse and worse, and the squeezing parameters can be updated in real time by a newly designed system, so that the squeezing stage achieves better effect; and thirdly, the judgment of the guest condition (the reduction rate of the pressing pressure, namely the pressure reduced in unit time) adjusts the parameters more scientifically and normatively.
The concrete mode is according to: parameters of a first stage are preset in the squeezing system, the parameters comprise squeezing pressure, squeezing times and squeezing pressure reduction time, and a squeezing process is completed, namely the pressure is reduced after the squeezing pressure is increased to a set value and within the set reduction time. In the process, the system collects the initial value and the final value of the squeezing pressure in the descending time, and the speed of the descending of the squeezing pressure can be obtained through calculation, so that the important data objectively reflect the water filtering efficiency in the squeezing process and indirectly reflect the squeezing effect at the same time, and a great number of tests show that the squeezing effect is better when the speed is higher; when the speed is lower than a certain value, the pressing effect is obviously reduced, and even the abnormality of mud spraying in the pressing process can occur. Therefore, the system presets an upper limit value and a lower limit value according to the real-time speed obtained by the last squeezing calculation, and when the real-time speed exceeds the upper limit value, the squeezing pressure is increased, the squeezing times are increased, and the squeezing descending time is reduced; when the real-time speed is lower than the lower limit value, the squeezing pressure is reduced, the squeezing times are reduced, and the squeezing descending time is prolonged; when the real-time rate is within a certain range, namely between an upper limit and a lower limit, the current parameters are ensured to be unchanged. The basis of the adjustment is that the higher the pressing pressure is, the more the pressing times are and the shorter the pressure reduction time is, the more the pressure release of the slurry in the plate frame is unfavorable, and the internal pressure of the plate frame objectively senses the water filtering condition of the slurry. It should be emphasized that, according to the actual operation situation, the squeezing effect is also affected when the real-time speed exceeds a certain value, so to ensure a better squeezing effect, "ensure the real-time speed to run within a certain range" is the best for the squeezing action, can realize the squeezing effect, and is the best measure for preventing the mud spraying phenomenon.
The invention has the beneficial effects that:
the method for automatically adjusting the pressing parameters and reducing the mud spraying at the pressing stage according to the depressurization time mainly comprises the steps of adding a relevant program for detecting the pressing initial state, judging the pressing execution state and automatically adjusting the pressing parameters in the original PLC program of the press filter, and mainly solves the problems that when a pressed object changes in real time (mainly caused by the drainage property of filter cloth, the effect of conditioning the mud and the like), a system can be automatically switched to a more appropriate state to execute, one set of parameters are unchanged, the manual adjustment parameters are not timely and incomplete, and the problems of overlong pressing time, unsatisfactory pressing effect and mud spraying abnormality during pressing can be limitedly avoided in actual production.
The method of the invention is to detect parameters of the initial stage of pressing, and enter certain preset pressing parameter setting after classification through calculation, and the parameters are determined according to the initial condition of pressing, so the method can be most close to the requirement of actual pressing.
Compared with the prior art, the method for automatically adjusting the pressing parameters and reducing the mud spraying at the pressing stage according to the depressurization time has the following advantages:
1. the setting of the squeezing parameters generally refers to the setting of other items at the early stage, or the experience of different debugging working personnel items, and no determined parameters can be used in a list, and due to the uncertainty of the setting, the squeezing process and the squeezing effect can be affected differently, and the unreasonable of manual parameter setting can be reduced by the setting of the system optimization parameters, so that the optimal effect is gradually achieved.
2. Because the sludge conditioning effect is different and the filter cloth filtering speed effect is different, the same squeezing parameters can obtain different squeezing effects every time, and the difference can be very large in some times, and abnormal conditions such as sludge spraying or plate frame dislocation can occur in extreme conditions, so in order to realize the best squeezing effect, the setting of the squeezing parameters can be changed along with different conditions, but the setting can not be judged before squeezing is carried out, so the possibility of realizing the squeezing by manual setting basically does not exist, and the problem can be well solved by adjusting the setting of the whole squeezing parameters according to the data obtained by the first squeezing action.
3. The squeezing action is firstly boosted to a set value and then reduced by a certain pressure value, so that the squeezing process is one time, the time for reducing the certain pressure value is measured by a program, the basic information of the squeezing action can be judged, and according to experience, the smaller the time is, the better the overall squeezing effect is, so that the parameter setting can be small in the past squeezing pressure setting, and the squeezing times are multidirectional; the longer the time is, the poorer the squeezing effect is, so that the parameter setting can be in the direction of larger squeezing pressure and reduced squeezing times, if some abnormal values occur in the time, special setting can be triggered, for example, if the time is too short, the mud feeding amount can be judged to be insufficient, and mud can be continuously fed; if the time is too long, the pressing failure of the mud feeding can be judged, and the conditioning effect or the filter cloth losing effect and other abnormalities are checked.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
The invention relates to a method for automatically adjusting pressing parameters and reducing the mud spraying at a pressing stage according to a depressurization time, which specifically comprises the following steps:
(1) and detecting the initial state of squeezing: collecting the time 11, 12 and 13 (minutes) of the pressure reduction of the oil cylinder in the first three times before the first stage of squeezing, and then taking the average value (12 minutes) of the three as a reference quantity t;
(2) adding subprogram content in a PLC control program of the existing standard YG type squeezer (the same minister TCYZ-200-YG type ultrahigh pressure elastic squeezer);
the additional subroutine content is as follows: judging the pressing execution state, self-tuning the pressing parameter (setting range is as follows)
(wherein the unit of the set value of the cylinder pressure drop is MPa, and the unit of the set value of the number of squeezing times is times)
If the time of the pressure drop of the oil cylinder is more than or equal to the reference amount t +2(14 minutes), and the condition is met, the squeezing parameters are self-adjusted as follows: the set value of the pressure drop of the oil cylinder is 3, and the squeezing times is set to be 20;
if the time of the pressure drop of the oil cylinder is greater than a reference amount t +1(13 minutes) and less than or equal to a reference amount t +2(14 minutes), the condition is met, the squeezing parameters are self-set as follows: the set value of the pressure drop of the oil cylinder is 2.5, and the squeezing times is 15;
if the time of the pressure drop of the oil cylinder is greater than a reference amount t-1(11 minutes) and less than or equal to a reference amount t +1(13 minutes), the condition is met, the squeezing parameters are self-set as follows: the set value of the pressure drop of the oil cylinder is 2.0, and the squeezing times is 12;
if the time of the pressure drop of the oil cylinder is greater than a reference amount t-2(10 minutes) and less than or equal to the reference amount t-1(11 minutes), the condition is met, the squeezing parameters are self-set as follows: the pressure drop set value of the oil cylinder is 1.0, and the squeezing times are set to 10;
if the time of the pressure drop of the oil cylinder is less than or equal to the reference amount t-2(10 minutes), and the condition is met, the squeezing parameters are self-adjusted as follows: the pressure drop set value of the oil cylinder is 0.8, and the squeezing times is set to 8;
(3) and when the plate-and-frame filter press is operated to a squeezing state, the PLC judges the squeezing execution state according to the preset subprogram, self-sets the squeezing parameters, and executes the squeezing action according to the preset program, so that the setting of the system self-setting squeezing parameters according to the actual squeezing conditions is realized.
Example 2
The invention relates to a method for automatically adjusting pressing parameters and reducing the mud spraying at a pressing stage according to a depressurization time, which specifically comprises the following steps:
(1) and detecting the initial state of squeezing: collecting the time 10, 11 and 12 (minutes) of the pressure reduction of the oil cylinder in the first three times before the first stage of squeezing, and then taking the average value (11 minutes) of the three as a reference quantity t;
(2) adding subprogram content in a PLC control program of the existing standard YG type squeezer (the same minister TCYZ-200-YG type ultrahigh pressure elastic squeezer);
the additional subroutine content is as follows: judging the pressing execution state, self-tuning the pressing parameter (setting range is as follows)
(wherein the unit of the set value of the cylinder pressure drop is MPa, and the unit of the set value of the number of squeezing times is times)
If the time of the pressure drop of the oil cylinder is more than or equal to the reference amount t +2(13 minutes), the squeezing parameters are self-adjusted as follows: the set value of the pressure drop of the oil cylinder is 3, and the squeezing times is set to be 20;
if the time of the pressure drop of the oil cylinder is greater than a reference amount t +1(12 minutes) and less than or equal to a reference amount t +2(13 minutes), the condition is met, the squeezing parameters are self-set as follows: the set value of the pressure drop of the oil cylinder is 2.5, and the squeezing times is 15;
if the time of the pressure drop of the oil cylinder is greater than a reference amount t-1(10 minutes) and less than or equal to a reference amount t +1(12 minutes), the condition is met, the squeezing parameters are self-set as follows: the set value of the pressure drop of the oil cylinder is 2.0, and the squeezing times is 12;
if the time of the pressure drop of the oil cylinder is greater than a reference amount t-2(9 minutes) and less than or equal to a reference amount t-1(10 minutes), the condition is met, the squeezing parameters are self-set as follows: the pressure drop set value of the oil cylinder is 1.0, and the squeezing times are set to 10;
if the time of the pressure drop of the oil cylinder is less than or equal to the reference amount t-2(9 minutes), the squeezing parameters are self-adjusted as follows: the pressure drop set value of the oil cylinder is 0.8, and the squeezing times is set to 8;
(3) and when the plate-and-frame filter press is operated to a squeezing state, the PLC judges the squeezing execution state according to the preset subprogram, self-sets the squeezing parameters, and executes the squeezing action according to the preset program, so that the setting of the system self-setting squeezing parameters according to the actual squeezing conditions is realized.
Claims (8)
1. A method for automatically adjusting the mud spraying at a pressing stage with reduced pressing parameters according to the depressurization time is characterized in that the method adds the related subprogram contents of detecting the pressing initial state, judging the pressing execution state and self-adjusting the pressing parameters in the PLC control program of the prior plate-and-frame filter press; the subprogram is as follows: firstly, collecting the average value of the pressure drop time of the oil cylinder three times before the first stage of squeezing as a reference quantity; then, the actual oil cylinder pressure reduction time is compared with a reference amount, and squeezing parameter self-tuning is carried out according to the difference value of the actual oil cylinder pressure reduction time and the reference amount.
2. The method for automatically adjusting the pressing parameters and reducing the mud injection at the pressing stage according to the depressurization time as claimed in claim 1, which is characterized by comprising the following steps:
(1) and detecting the initial state of squeezing: collecting the time of the pressure reduction of the oil cylinder three times before the first stage of squeezing, and then taking the average value of the three as a reference quantity t;
(2) adding subprogram content in the PLC control program of the existing plate-and-frame filter press;
the additional subroutine content is as follows:
if the time of the pressure drop of the oil cylinder is more than or equal to the reference amount t +2 and the condition is met, the squeezing parameters are self-adjusted as follows: the pressure drop set value of the oil cylinder is n, and the squeezing times is set to be 20;
if the time of the pressure drop of the oil cylinder is greater than the reference amount t +1 and less than or equal to the reference amount t +2, and the condition is met, the squeezing parameters are self-set as follows: the pressure drop set value of the oil cylinder is n-0.5, and the squeezing frequency is set to 15;
if the time of the pressure drop of the oil cylinder is greater than the reference amount t-1 and less than or equal to the reference amount t +1, and the condition is met, the squeezing parameters are self-set as follows: the pressure drop set value of the oil cylinder is n-1, and the squeezing times are set to 12;
if the time of the pressure drop of the oil cylinder is greater than the reference amount t-2 and less than or equal to the reference amount t-1, and the condition is met, the squeezing parameters are self-set as follows: the pressure drop set value of the oil cylinder is n-2, and the squeezing times are set to 10;
if the time of the pressure drop of the oil cylinder is less than or equal to the reference amount t-2 and the condition is met, the squeezing parameters are self-adjusted as follows: the pressure drop set value of the oil cylinder is n-2.2, and the squeezing frequency is set to 8;
wherein, the unit of the set value of the pressure drop of the oil cylinder is MPa, and the unit of the set value of the pressing times is times;
(3) and when the plate-and-frame filter press is operated to a squeezing state, the PLC judges the squeezing execution state according to the preset subprogram, self-adjusts the squeezing parameters, and executes the squeezing action according to the preset program.
3. The method for automatically adjusting the pressing parameters and reducing the mud spraying at the pressing stage according to the depressurization time according to claim 1 or 2, wherein the plate-and-frame filter press is an iso-TCYZ-200-YG type ultrahigh pressure elastic press.
4. The method for automatically adjusting the pressing parameters and reducing the mud sprayed at the pressing stage according to the depressurization time according to claim 3, wherein the content of a subprogram is added to the PLC control program of the existing co-minister TCYZ-200-YG type press; the additional subroutine content is as follows:
if the time of the pressure drop of the oil cylinder is more than or equal to the reference amount t +2 and the condition is met, the squeezing parameters are self-adjusted as follows: the cylinder pressure drop set value was 3, and the number of squeezing cycles was set to 20.
5. The method for automatically adjusting the pressing parameters to reduce the mud injection at the pressing stage according to the depressurization time as claimed in claim 4, wherein if the time for the cylinder pressure to decrease is greater than a reference amount t +1 and less than or equal to a reference amount t +2, and this condition is satisfied, the pressing parameters are self-adjusted as follows: the cylinder pressure drop set value was 2.5 and the number of squeezing cycles was set to 15.
6. The method for automatically adjusting the pressing parameters to reduce the mud injection at the pressing stage according to the depressurization time as claimed in claim 4, wherein if the time for the cylinder pressure to decrease is greater than a reference amount t-1 and less than or equal to a reference amount t +1, and this condition is satisfied, the pressing parameters are self-adjusted as follows: the cylinder pressure drop set value was 2.0 and the number of squeezing times was set to 12.
7. The method for automatically adjusting the pressing parameter and reducing the mud spraying at the pressing stage according to the depressurization time as claimed in claim 4, wherein if the time for the cylinder pressure to decrease is greater than a reference amount t-2 and less than or equal to the reference amount t-1, and this condition is satisfied, the pressing parameter is self-adjusted as follows: the cylinder pressure drop set value was 1.0, and the number of squeezing times was set to 10.
8. The method for automatically adjusting the pressing parameter and reducing the mud spraying at the pressing stage according to the depressurization time as claimed in claim 4, wherein if the time for the pressure of the oil cylinder to be reduced is less than or equal to a reference amount t-2 and this condition is satisfied, the pressing parameter is self-adjusted as follows: the cylinder pressure drop set value was 0.8, and the number of squeezing times was set to 8.
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2021
- 2021-08-03 CN CN202110885794.4A patent/CN113526832A/en active Pending
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| AU2002323712A2 (en) * | 1997-07-15 | 2003-04-03 | Zamtec Limited | A field actuated ink jet |
| JPH11165198A (en) * | 1997-12-04 | 1999-06-22 | Tokyoto Gesuido Service Kk | Dehydration evaluation test device of sludge and method for operating the same |
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Application publication date: 20211022 |
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| WD01 | Invention patent application deemed withdrawn after publication |