CN211390257U - Control device is prevented spouting in squeezer feeding - Google Patents
Control device is prevented spouting in squeezer feeding Download PDFInfo
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- CN211390257U CN211390257U CN201922363161.8U CN201922363161U CN211390257U CN 211390257 U CN211390257 U CN 211390257U CN 201922363161 U CN201922363161 U CN 201922363161U CN 211390257 U CN211390257 U CN 211390257U
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Abstract
The utility model discloses a control device is prevented spouting in squeezer feeding. A feeding pressure sensor, a small oil cylinder pressure sensor and a large oil cylinder pressure sensor are respectively connected with the input end of the PLC; the output end of the PLC is connected with a proportional overflow valve arranged on an oil inlet pipeline of the small oil cylinder, and the pressure of the small oil cylinder is controlled by controlling the opening of the proportional overflow valve; the output end of the PLC is connected with a variable frequency motor for driving a feeding pumpControlling the feeding speed by controlling the rotation speed of a variable frequency motor driving the feeding pump, and setting an A value, namely delta P × S in a PLC control program1The maximum value of (1) is that P1, P2 and P3 real-time data are collected in the process of feeding materials, and the data are measured for delta P × S1The value of (A) is continuously calculated, and once the value of (B) exceeds the value of (A), the feeding is stopped for pressing; therefore, the feeding flow speed and the pressure of the small oil cylinder are automatically adjusted by feeding back the pressure value, and the operation of the equipment is monitored. The device can prevent spouting material control adjustment to whole equipment from the source, solves the feeding and spouts the material problem.
Description
Technical Field
The utility model belongs to the technical field of the sludge press filtration dehydration, a controlling means is prevented spouting in squeezer feeding is related to.
Background
A plate-frame type oil cylinder presser (hereinafter referred to as presser) is a filter pressing mechanical device widely applied to sludge dewatering treatment. The automatic feeding device generally comprises a squeezer body, a feeding system, a hydraulic system and a PLC control system; the squeezer body comprises a plurality of filter plate frames which are arranged in sequence; each filter plate frame comprises a plate frame and a bearing plate (thrust plate), filter cloth is coated outside the plate frame, a plurality of small oil cylinders (plunger cylinders) are arranged around the plate frame and the bearing plate, the cylinder bodies of the small oil cylinders are arranged in the plate frame, and the top ends of piston rods of the small oil cylinders prop against the bearing plate; the rear outer surface of the plate frame of the last filter plate frame of the squeezer body is propped against the front outer surface of the push plate; the top end of a piston rod of the large oil cylinder props against the rear outer surface of the pushing plate; the feeding system comprises a feeding pump and a feeding hole; a feed inlet is formed in the center of the foremost filter plate frame of the squeezer body; the hydraulic system is used for supplying oil to the small oil cylinder and the large oil cylinder; the PLC control system is used for controlling the feeding process and the squeezing process.
In the feeding process of the plate and frame type oil cylinder press, the balance among the feeding pressure P1 of the plate frame, the pressure P2 of the small oil cylinder and the pressure P3 of the large oil cylinder is not controlled well, so that the sealing force of the plate frame is reduced, and the phenomenon of leaking and spraying materials between the plate frame and the bearing plate, namely, the material spraying of the press, is caused. The material is spouted to the squeezer is the problem that often appears in work, not only can influence the circulation of squeezer system for the operation can't normally be gone on, still can directly damage filter cloth and filter plate when serious, leads to certain life safety even, adds use cost for the enterprise.
The existing squeezer equipment generally has the following actions for preventing the blowout:
1. in the presser industry, the sealing of the plate frame usually adopts a method of adding a sealing strip or a locking force to prevent the material spraying during the feeding of the equipment, so that the normal operation of the equipment can be maintained. However, the sealing tape is aged, and therefore, the sealing force is continuously decreased with the aging of the sealing tape, and thus, a complete reliable seal cannot be made.
2. And a protective cover is added on the outer side of the equipment. The increase of the protective cover only can make the wave-reaching surface a little bit after the material is sprayed, so that the treatment is temporary and permanent.
Therefore, it is necessary to research how to start with the feeding operation principle of the press, to explore the reasons for material spraying of the equipment, and to solve the material spraying problem of the press by adding the material spraying prevention monitoring program.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's not enough, provide one kind through increasing and prevent spouting material monitor program, solve the squeezer and spout controlling means is prevented spouting of squeezer feeding of material problem.
The utility model aims at realizing through the following technical scheme:
the utility model relates to a controlling means is prevented spouting in squeezer feeding, it includes: the squeezer comprises a squeezer body, a feeding system, a hydraulic system and a PLC control system; the squeezer body comprises a plurality of filter plate frames which are arranged in sequence; each filter plate frame comprises a plate frame and a bearing plate, filter cloth is coated outside the plate frame, a plurality of small oil cylinders are arranged around the space between the plate frame and the bearing plate, the cylinder bodies of the small oil cylinders are arranged in the plate frame, and the top ends of piston rods of the small oil cylinders prop against the bearing plate; the rear outer surface of the plate frame of the last filter plate frame of the squeezer body is propped against the front outer surface of the push plate; the top end of a piston rod of the large oil cylinder props against the rear outer surface of the pushing plate; the feeding system comprises a feeding pump and a feeding hole; a feed inlet is formed in the center of the foremost filter plate frame of the squeezer body; the feeding pump is connected with the feeding hole; the hydraulic system is used for supplying oil to the small oil cylinder and the large oil cylinder; the overflow valve on the oil inlet pipe of the small and medium oil cylinder in the hydraulic system is a proportional overflow valve;
the PLC control system comprises a PLC controller; a feeding pressure sensor is arranged at a feeding hole of the squeezer or an outlet of the feeding pump; a small oil cylinder pressure sensor is arranged at an oil inlet of the small oil cylinder; a large oil cylinder pressure sensor is arranged at an oil inlet of the large oil cylinder; the feeding pressure sensor, the small oil cylinder pressure sensor and the large oil cylinder pressure sensor are respectively connected with the input end of the PLC; the output end of the PLC is connected with a proportional overflow valve arranged on an oil inlet pipeline of the small oil cylinder, and the pressure of the small oil cylinder can be controlled by controlling the opening of the proportional overflow valve; the output end of the PLC is connected with a motor for driving the feeding pump or a proportional valve of a hydraulic driving device of the feeding pump; the feeding speed can be controlled by controlling the rotation speed of a motor driving the feeding pump or controlling the opening degree of a proportional valve of a hydraulic driving device of the feeding pump.
Furthermore, the feeding pump is driven by a variable frequency motor, and the output end of the PLC is connected with the variable frequency motor for driving the feeding pump; controlling the working frequency of a variable frequency motor driving a feeding pump; the speed of the feed pump (and at the same time the feed pump outlet flow) can be controlled to control the feed rate.
Furthermore, the feeding pump is driven by hydraulic pressure, a hydraulic driving device of the feeding pump is controlled by a hydraulic proportional valve or a proportional overflow valve (namely the flow of hydraulic oil for driving the feeding pump is controlled by the hydraulic proportional valve or the proportional overflow valve), and the output end of the PLC is connected with the hydraulic proportional valve or the proportional overflow valve of the hydraulic driving device of the feeding pump; the speed of the feed pump (and the outlet flow of the feed pump) can be controlled by controlling the opening degree of a hydraulic proportional valve or a proportional overflow valve of a hydraulic driving device of the feed pump, so that the feed speed is controlled. The speed of the feed pump can be the rotating speed of the feed pump (screw pump) or the forward/backward speed of the plunger of the feed pump (plunger pump).
Further, the diameter d of the feed opening (namely the central feed opening) of the squeezer is increased by 55-65%, and the design is improved to be 200mm +/-20 mm from the original 120mm +/-10 mm.
Further, the length l of the central feeding hole of the presser is designed to be reduced by 10-15% (from 5600mm +/-100 mm to 5000 +/-100 mm), and the reduction can be realized by reducing the number of the presser plate frames.
The control method for preventing the feeding blowout of the squeezer by utilizing the control device for preventing the feeding blowout of the squeezer comprises the following step of adding a monitoring program for preventing the feeding blowout in a PLC (programmable logic controller), namely, setting an A value, namely delta P × S, in the PLC control program1The method comprises the steps of collecting feeding pressure P1, small oil cylinder pressure P2 and large oil cylinder pressure P3 real-time pressure values through a feeding pressure sensor, a small oil cylinder pressure sensor and a large oil cylinder pressure sensor in the process of material feeding when a squeezer is actually operated, and carrying out calculation on the delta P × S through an arithmetic unit in a PLC (programmable logic controller)1The value of (A) is continuously calculated, and once the actually operated value of Δ P × S is obtained1If the value of (B) exceeds the set value of (A), stopping feeding and squeezing; therefore, the feeding pressure, the pressure of the small oil cylinder and the feeding flow rate are automatically adjusted through the pressure values of P1, P2 and P3 fed back by the feeding pressure sensor, the pressure sensor of the small oil cylinder and the pressure sensor of the large oil cylinder; therefore, the operation of the equipment is monitored, and the material spraying is prevented.
Further, a value of a, i.e., Δ P × S, is set in the PLC control program1And a maximum limit value of the PLC control program, and the calculation of delta P × S1The real-time value B of the system is a calculation formula of B-P1 × S1+ P2 × S2-P3 × S3, wherein S1 is a filtering area, S2 is the sum of all small oil cylinder areas, S3 is a large oil cylinder area, in the process of material feeding, a PLC controller continuously collects the values of a feeding pressure sensor, a small oil cylinder pressure sensor and a large oil cylinder pressure sensor, and the values are respectively the values of feeding pressure P1, small oil cylinder pressure P2 and large oil cylinder pressure P3, then an arithmetic unit in the PLC controller carries out continuous operation according to the calculation formula of B-P1 × S1+ P2 × S2-P3 × S3 to obtain a B value, and the calculated B value is delta P × S3536S 31And the set value A, i.e. Δ P × S1Comparing the maximum limit values; if the B value is close to the A value, the PLC controller controls the working frequency of a motor driving the feeding pump or controls the feeding pumpThe opening of the proportional valve of the hydraulic drive of the pump reduces the speed of the feed pump, thereby reducing the feed speed v; meanwhile, the PLC controls the opening degree of a proportional overflow valve on an oil inlet pipe of the small oil cylinder to increase the pressure P2 value of the small oil cylinder; when the feed rate v decreases to a minimum value (which is determined by the characteristics of the feed pump) while the small cylinder pressure P2 increases to a maximum value, the value B still rises; and when the value B is larger than or equal to the value A, the PLC controls the feed pump to stop running, the squeezer finishes feeding, and the squeezing program is switched.
The utility model has the advantages that:
compared with the prior art, the utility model, have following advantage:
1. the utility model discloses a hydraulic fluid mechanics's analysis increases one in PLC control procedure and prevents material monitoring program, through feedback pressure numerical value, automatic adjustment feed pressure, velocity of flow, little hydro-cylinder pressure. Thereby can follow the source and prevent spouting material control adjustment to whole equipment, greatly reduced spout the loss that the material caused to the enterprise, improved the safety in utilization of equipment.
2. The utility model discloses a success on probation on the field operation of a plurality of projects of control mode. The material phenomenon is often spouted in the feeding link to original equipment, adopts this monitoring mode after, has solved the feeding and has spouted the problem of material.
3. By adopting the control method in the presser industry, the sealing force required by the plate frame can be accurately calculated, and the risk of damage to the plate frame caused by incapability of accurately calculating the sealing force of the plate frame in the debugging stage is greatly reduced.
4. The control method can be applied to the anti-spraying material of an elastic presser, a van-type plate frame machine and a membrane separator, and is a reasonable control logic.
Drawings
Fig. 1 is a schematic view of a presser structure and a plate frame stress analysis in the present invention;
fig. 2 is a schematic view of the bearing surface (direction a) of the plate frame 1 of the squeezer;
fig. 3 is a schematic structural diagram of the feed blowout prevention control device of the squeezer (the feed pump is driven by a variable frequency motor);
fig. 4 is the structure schematic diagram of the feeding blowout prevention control device of the squeezer (the feeding pump is driven by hydraulic pressure).
In the figure: 1. the device comprises a plate frame 2, a small oil cylinder 3, a large oil cylinder 4, a feed inlet (central feed hole) 5, a pressure-bearing plate 6, a material cake 7, a feed pressure sensor 8, a small oil cylinder pressure sensor 9, a large oil cylinder pressure sensor 10, a proportional overflow valve 11, a push plate 12, a feed pump 13, a variable frequency motor 14, a hydraulic proportional valve 15, a proportional overflow valve S1, a filtering area (namely the area of the material cake) S2, the sum of the areas of all the small oil cylinders S3, a large oil cylinder area S4, a sealing area P1, feed pressure (namely the pressure of the material cake) P2, small oil cylinder pressure P3, large oil cylinder pressure F and plate frame sealing force.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
Examples
As shown in fig. 1, fig. 2 and fig. 3, the utility model relates to a control device is prevented spouting in squeezer feeding, it includes: the squeezer comprises a squeezer body, a feeding system, a hydraulic system and a PLC control system; the squeezer body comprises a plurality of filter plate frames which are arranged in sequence; each filter plate frame comprises a plate frame 1 and a bearing plate 5 (thrust plate), filter cloth is coated outside the plate frame 1, a plurality of small oil cylinders 2 (plunger cylinders) are arranged around the space between the plate frame 1 and the bearing plate 5, the cylinder bodies of the small oil cylinders 2 are arranged in the plate frame 1, and the top ends of piston rods of the small oil cylinders 2 prop against the bearing plate 5; the rear outer surface of the plate frame 1 of the last filter plate frame of the squeezer body is propped against the front outer surface of the push plate 11; the top end of the piston rod of the large oil cylinder 3 props against the rear outer surface of the pushing plate 11; the feeding system comprises a feeding pump 12 and a feeding port 4; a feed port 4 (namely a central feed hole) is arranged in the center of the foremost filter plate frame of the squeezer body; the feeding pump 12 is connected with the feeding port 4; the hydraulic system is used for supplying oil to the small oil cylinder 2 and the large oil cylinder 3; the overflow valve on the oil inlet pipe of the small oil cylinder 2 in the hydraulic system is a proportional overflow valve 10.
The PLC control system comprises a PLC controller; a feeding pressure sensor 7 is arranged at the feeding hole 4 of the squeezer; a small oil cylinder pressure sensor 8 is arranged at an oil inlet of the small oil cylinder 2; a large oil cylinder pressure sensor 9 is arranged at an oil inlet of the large oil cylinder 3; the small oil cylinder feeding pressure sensor 7, the small oil cylinder pressure sensor 8 and the large oil cylinder pressure sensor 9 are respectively connected with the input end of the PLC; the output end of the PLC is connected with a proportional overflow valve 10 arranged on an oil inlet pipeline of the small oil cylinder 2, and the pressure of the small oil cylinder 2 can be controlled by controlling the opening degree of the proportional overflow valve 10.
As shown in fig. 3, the feeding pump 12 is driven by a variable frequency motor 13, the output end of the PLC controller is connected to the variable frequency motor 13 driving the feeding pump 12, and the speed of the feeding pump 12 (and the outlet flow of the feeding pump 12) can be controlled by controlling the operating frequency of the variable frequency motor 13 driving the feeding pump 12, so as to control the feeding speed.
Or, as shown in fig. 4, the feed pump 12 is hydraulically driven, the hydraulic driving device of the feed pump 12 is controlled by using a hydraulic proportional valve 14 or a proportional overflow valve 15 (that is, the flow rate of the hydraulic oil for driving the feed pump 12 is controlled by using the hydraulic proportional valve 14 or the proportional overflow valve 15), and the output end of the PLC controller is connected with the hydraulic proportional valve 14 or the proportional overflow valve 15 of the hydraulic driving device of the feed pump 12; by controlling the opening of the hydraulic proportional valve 14 or the proportional relief valve 15 of the hydraulic drive of the charge pump 12, the speed of the charge pump 12 (and at the same time the outlet flow of the charge pump 12) and thus the feed rate can be controlled.
According to fig. 1 and 3, the plate frame stress of the squeezer is analyzed as follows:
P3×S3＝(P1-ΔP)×S1+P2×S2(formula one)
Plate frame sealing force F ═ P2XS 2-delta PxS1 (formula II)
Wherein: delta P is the on-way resistance loss, P1 is the feed pressure (i.e. cake pressure), P2 is the small cylinder pressure, and P3 is the large cylinder pressure; s1 is the filtering area (i.e. cake area, i.e. plate frame area minus sealing area S4), S2 is the sum of all small cylinder areas, S3 is large cylinder area, S4 is sealing area (i.e. sealing surface area); f is the plate frame sealing force; the plate frame sealing force F acts on the sealing area S4 to perform a sealing function.
As shown in fig. 2, filter area S1 ═ plate and frame area-seal area S4; the area of the plate frame is equal to the peripheral length of the plate frame multiplied by the peripheral width of the plate frame-the area of the central feeding hole 4; the area of the central inlet opening 4 is pi x (d/2) 2. The sealing area S4 is the actual pressure area of the plate frame force-bearing surface.
According to the second formula, when the delta P is too large, the plate frame sealing force F is reduced too much, so that the material spraying phenomenon occurs, and the value A is set to be delta P × S1The value A is the maximum value which allows the original sealing force value P2XS2 to be weakened, when the value A is reached, the feeding is stopped, the squeezing process is carried out, and therefore, the sealing force F can be ensured to be in a reasonable range and the situation that the material is not sprayed can be ensured by specifying the value A.
The calculation formula of the loss of the on-way resistance of the delta P is as follows:
wherein: λ is the coefficient of on-way resistance; (the in-path drag coefficient lambda is related to the chemical composition, density, viscosity, pipe roughness of the material- -that is, the composition and degree of conditioning of the material)
l is the length of the central feeding hole, d is the diameter of the central feeding hole;
rho is the density of the material, and v is the feed rate of the material.
According to the third formula, it can be seen that:
(1) under the condition that the materials are the same and the pipeline roughness is the same, the on-way resistance coefficient lambda and the density rho of the materials are fixed, and the factors influencing delta P are as follows: the length l of the central feeding hole (related to the number of plate frames), the diameter d of the central feeding hole and the feeding speed v of the material.
(2) When the same presser equipment is used, the length l of the central feeding hole and the diameter d of the central feeding hole are fixed, and the factors influencing the delta P are as follows: the on-way resistance coefficient lambda, the density rho of the material and the feeding speed v of the material.
The on-way resistance coefficient lambda and the density rho of the material are determined by the material components and the conditioning condition of the material, and the feeding speed v of the material can be controlled. To reduce Δ P, two methods may be employed: (a) the number of the plate frames can be controlled, namely the length l of the central feeding hole is controlled within the range of 5600mm +/-100 mm, and the diameter d of the central feeding hole is properly increased; (b) the number of the plate frames can be reduced to reduce the value l (the value of the length l of the central feeding hole can be reduced by 10-15 percent, namely the value can be reduced from 5600mm +/-100 mm to 5000 +/-100 mm), but the area of the plate frame is preferably correspondingly increased to ensure that the total filtering area S1 is not changed when the length l of the central feeding hole is reduced. Considering the contradiction of filtering area and reduction delta P, central feed port diameter d can suitably increase, the utility model discloses design into the increase 55-65% with the diameter d of squeezer feed inlet (be central feed port) 4, from original 120mm 10mm, improve the design and be 200mm 20mm, simultaneously, reach the effect that reduces delta P through control feed speed v in the feeding process.
According to the formula II, under the condition that the sum S2 of the areas of all the small oil cylinders is fixed, the value P2 of the pressure of the small oil cylinders is increased, the value F of the sealing force can be increased, and the mud spraying phenomenon is reduced; the pressure P2 value of the small oil cylinder is increased, the overflow valve on the oil inlet pipe of the small oil cylinder in the original hydraulic system can be changed into a proportional overflow valve 10, and the opening degree of the proportional overflow valve 10 is controlled by a PLC controller to realize the control of the pressure P2 value of the small oil cylinder.
The feeding pressure sensor 7, the small oil cylinder pressure sensor 8 and the large oil cylinder pressure sensor 9 are respectively connected with the input end of the PLC; the output end of the PLC is connected with a proportional overflow valve 10 arranged on an oil inlet pipeline of the small oil cylinder 2; the small cylinder pressure can be controlled by controlling the opening of the proportional relief valve 10.
The output end of the PLC is also connected with a variable frequency motor 13 for driving the feeding pump 12, or connected with a hydraulic proportional valve 14 or a proportional overflow valve 15 of a hydraulic driving system of the feeding pump 12. The feeding pump 12 is driven by a variable frequency motor 13, and the rotating speed of the feeding pump 12 can be controlled by controlling the working frequency of the variable frequency motor 13 for driving the feeding pump (meanwhile, the outlet flow of the feeding pump 12 can be controlled), so that the feeding speed v can be controlled; or, the feed pump 12 is driven by hydraulic pressure, and the hydraulic driving system of the feed pump 12 is controlled by using a hydraulic proportional valve 14 or a proportional overflow valve 15 (that is, the flow rate of hydraulic oil for driving the feed pump 12 is controlled by using the hydraulic proportional valve 14 or the proportional overflow valve 15), and the rotation speed of the feed pump 12 can be controlled by controlling the opening degree of the hydraulic proportional valve 14 or the proportional overflow valve 15 of the hydraulic driving device of the feed pump 12; thus, the PLC controller can control the rotational speed of the feed pump 12 (and at the same time the outlet flow of the feed pump 12), i.e. the feed rate v can be controlled.
The utility model discloses a control method is prevented spouting in squeezer feeding increases a prevent spouting supervisory program in PLC control program, promptly, sets for a value A in PLC control program, delta P × S promptly1The method comprises the steps of collecting real-time pressure values of P1, P2 and P3 through a feeding pressure sensor, a small oil cylinder pressure sensor and a large oil cylinder pressure sensor in the process of material feeding when a squeezer is actually operated, and carrying out calculation on the maximum limit value of delta P × S through an arithmetic unit in a PLC (programmable logic controller)1The value of (A) is continuously calculated, and once the actually operated value of Δ P × S is obtained1If the value of (B) exceeds the set value of (A), stopping feeding and squeezing; therefore, the feeding pressure, the pressure of the small oil cylinder and the feeding flow rate are automatically adjusted through the pressure values of P1, P2 and P3 fed back by the feeding pressure sensor, the pressure sensor of the small oil cylinder and the pressure sensor of the large oil cylinder; therefore, the operation of the equipment is monitored, and the material spraying is prevented.
The utility model discloses a squeezer feeding prevents spouting concrete implementation method of control as follows:
setting a value A, namely delta P × S in a PLC control program1And a maximum limit value of the PLC control program, and the calculation of delta P × S1In the process of material feeding, the PLC controller continuously collects values of a feeding pressure sensor 7, a small oil cylinder pressure sensor 8 and a large oil cylinder pressure sensor 9 which are respectively values of a feeding pressure P1, a small oil cylinder pressure P2 and a large oil cylinder pressure P3, then an arithmetic unit in the PLC controller carries out continuous operation according to a B value calculation formula, wherein B is P1 × S1+ P2 × S2-P3 × S3, a B value is obtained, and the obtained B value (delta P × S3) is obtained through calculation1Real-time value of) and the set a value (Δ P × S)1Maximum limit value of) are compared; if the B value is close toIf the value is A, the PLC controller controls the working frequency of a variable frequency motor 13 for driving the feeding pump 12 or controls the opening degree of a hydraulic proportional valve 14 or a proportional overflow valve 15 of a hydraulic driving device for the feeding pump 12, so that the speed of the feeding pump is reduced, and the feeding speed v is reduced; meanwhile, the PLC controller controls the opening degree of a proportional overflow valve 10 on an oil inlet pipe of the small oil cylinder 2 to increase the pressure P2 value of the small oil cylinder; when the feeding speed v is reduced to the minimum value (the minimum value is determined by the characteristics of a feeding pump), and the small cylinder pressure P2 value is increased to the maximum value (the maximum value of the small cylinder pressure P2 value is determined by the pressure resistance value of a small cylinder; generally, in the initial mud feeding working condition, the small cylinder pressure P2 value is controlled to be about 14MPa, and when the B value is increased to be close to the A value, the small cylinder pressure P2 value is increased to be about 20MPa under the control of a PLC controller), the B value still rises; and when the value B is larger than or equal to the value A, the PLC controls the feed pump to stop running, the squeezer finishes feeding, and the squeezing program is switched. Therefore, the feeding pressure, the pressure of the small oil cylinder and the feeding flow rate are automatically adjusted through the pressure values of P1, P2 and P3 fed back by the feeding pressure sensor, the pressure sensor of the small oil cylinder and the pressure sensor of the large oil cylinder; therefore, the operation of the equipment is monitored, and the material spraying is prevented.
In summary, the above monitoring method is adopted as long as the B value (i.e. Δ P × S) is monitored well1The real-time value), the pressure P2 value of the small oil cylinder and the feeding speed v, so that the aim of effectively preventing the material from spraying can be fulfilled.
Claims (5)
1. A control device is prevented spouting in squeezer feeding, its characterized in that, it includes: the squeezer comprises a squeezer body, a feeding system, a hydraulic system and a PLC control system; the squeezer body comprises a plurality of filter plate frames which are arranged in sequence; each filter plate frame comprises a plate frame and a bearing plate, filter cloth is coated outside the plate frame, a plurality of small oil cylinders are arranged around the space between the plate frame and the bearing plate, the cylinder bodies of the small oil cylinders are arranged in the plate frame, and the top ends of piston rods of the small oil cylinders prop against the bearing plate; the rear outer surface of the plate frame of the last filter plate frame of the squeezer body is propped against the front outer surface of the push plate; the top end of a piston rod of the large oil cylinder props against the rear outer surface of the pushing plate; the feeding system comprises a feeding pump and a feeding hole; a feed inlet is formed in the center of the foremost filter plate frame of the squeezer body; the feeding pump is connected with the feeding hole; the hydraulic system is used for supplying oil to the small oil cylinder and the large oil cylinder; the overflow valve on the oil inlet pipe of the small and medium oil cylinder in the hydraulic system is a proportional overflow valve;
the PLC control system comprises a PLC controller; a feeding pressure sensor is arranged at a feeding hole of the squeezer or an outlet of the feeding pump; a small oil cylinder pressure sensor is arranged at an oil inlet of the small oil cylinder; a large oil cylinder pressure sensor is arranged at an oil inlet of the large oil cylinder; the feeding pressure sensor, the small oil cylinder pressure sensor and the large oil cylinder pressure sensor are respectively connected with the input end of the PLC; the output end of the PLC is connected with a proportional overflow valve arranged on an oil inlet pipeline of the small oil cylinder, and the pressure of the small oil cylinder can be controlled by controlling the opening of the proportional overflow valve; the output end of the PLC is connected with a motor for driving the feeding pump or a proportional valve of a hydraulic driving device of the feeding pump; the feeding speed can be controlled by controlling the rotation speed of a motor driving the feeding pump or controlling the opening degree of a proportional valve of a hydraulic driving device of the feeding pump.
2. The presser feed blowout prevention control device according to claim 1, wherein the feed pump is driven by a variable frequency motor, and the output end of the PLC controller is connected with the variable frequency motor for driving the feed pump; the speed of the feed pump can be controlled by controlling the working frequency of a variable frequency motor driving the feed pump, so that the feed speed is controlled.
3. The control device for preventing the blowout of the feeding machine of the presser in claim 1, wherein the feeding pump is driven by hydraulic pressure, the hydraulic driving device of the feeding pump is controlled by a hydraulic proportional valve or a proportional overflow valve, and the output end of the PLC is connected with the hydraulic proportional valve or the proportional overflow valve of the hydraulic driving device of the feeding pump; the speed of the feed pump can be controlled by controlling the opening of a hydraulic proportional valve or a proportional overflow valve of a hydraulic driving device of the feed pump, so that the feed speed is controlled.
4. A press feed blow out prevention control device as claimed in claim 1, 2 or 3, characterised in that the press feed opening, i.e. the central feed opening, is designed to increase in diameter d by 55-65%.
5. A press feed blow out prevention control device as in claim 1, 2 or 3 wherein the press central feed hole length/is designed to be reduced by 10-15%.
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| CN201922363161.8U CN211390257U (en) | 2019-12-25 | 2019-12-25 | Control device is prevented spouting in squeezer feeding |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114228223A (en) * | 2021-12-28 | 2022-03-25 | 同臣环保装备科技(苏州)有限公司 | Novel electro-hydraulic squeezing system and working method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114228223A (en) * | 2021-12-28 | 2022-03-25 | 同臣环保装备科技(苏州)有限公司 | Novel electro-hydraulic squeezing system and working method thereof |
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