CN218945336U

CN218945336U - Doublestage pushing centrifugal machine

Info

Publication number: CN218945336U
Application number: CN202223379122.5U
Authority: CN
Inventors: 王茂春; 田义群; 曹杰; 张锐; 唐超; 胡丹; 王炜; 高晓霞
Original assignee: Hubei Taisheng Chemical Co Ltd
Current assignee: Hubei Taisheng Chemical Co Ltd
Priority date: 2022-12-16
Filing date: 2022-12-16
Publication date: 2023-05-02
Anticipated expiration: 2032-12-16

Abstract

The utility model discloses a double-stage pushing centrifugal machine, which comprises a base and a motor arranged on the base, wherein a hood is arranged at one end of the base, a rotating shaft of the motor stretches into the hood, a primary rotary drum and a secondary rotary drum are arranged on the rotating shaft, a primary screen and a secondary screen are respectively arranged on the primary rotary drum and the secondary rotary drum, a feeding pipe and a flushing pipe are arranged on the hood, a solid discharge port and a liquid discharge port are arranged on the hood, an electromagnetic flow regulating valve is arranged on the feeding pipe, an electric ball valve is arranged on the flushing pipe, an electromagnetic flowmeter is arranged on the liquid discharge port, and the electromagnetic flow regulating valve, the electric ball valve and the electromagnetic flowmeter are all electrically connected with a PLC (programmable logic controller). The double-stage pushing centrifugal machine provided by the utility model can automatically regulate the feeding quantity on line in real time and automatically control flushing, improves the notification mode of the feeding port, not only improves the production efficiency, but also greatly improves the control precision, and is more beneficial to centrifugally separating materials with high quality.

Description

Doublestage pushing centrifugal machine

Technical Field

The utility model belongs to the technical field of double-stage pushing centrifuges, and particularly relates to a double-stage pushing centrifuges.

Background

The double-stage pushing centrifugal machine is widely applied to continuous solid-liquid separation of suspended liquid materials, and the working principle of the double-stage pushing centrifugal machine is that suspended liquid enters a high-speed rotating separation drum from a feed pipe, the suspended liquid is uniformly distributed on a drum screen under the action of centrifugal force, and the liquid is thrown out of the drum through gaps of the rotating screen to a liquid outlet for recycling. The solid is trapped on the rotary drum screen to form an annular filter cake, and the annular filter cake is pushed out of the screen by the reciprocating material returning plate to the discharge bin. The centrifugal machine is influenced by the change of the solid-liquid ratio of the materials at the feeding end, and the following conditions occur:

1. the feed suspension had a small solids content and a large liquid content. At this time, the feeding valve must be manually adjusted to reduce the feeding amount, otherwise, the liquid reaches the upper limit of the water amount of the gap of the screen, and the liquid which cannot timely permeate the gap of the screen is mixed with the solid material on the surface of the screen to be adhered to the screen of the centrifugal machine, so that the screen rotating at a high speed is unbalanced, and the machine is vibrated severely. At the moment, the operator is required to intervene, the feeding valve is closed, the flushing water valve is opened to flush the bonded materials of the screen, and the feeding can be recovered to continue the separation operation.

2. The feed suspension had a large solids content and a small liquid content. At the moment, the feeding valve must be manually adjusted in time, so that the feeding amount is increased, and the problem that the feeding valve and a pipeline in front of the valve are blocked by solid materials with higher concentration due to poor fluidity is avoided.

3. After the centrifuge runs continuously for a period of time, the screen is blocked or unevenly distributed due to the viscosity of the suspension and large-particle crystals, so that the centrifugal effect is poor, and the humidity of the separated solid materials is high. At the moment, the feeding valve is manually closed, the screen mesh is completely washed by opening washing water, and the feeding separation operation can be restored.

In summary, if the front-end production process cannot strictly control the solid-to-liquid ratio of the suspension fed by the centrifuge, special people must be arranged to operate the centrifuge, and frequent adjustment of the feeding valve and switching of the cleaning valve are required, so that the labor cost and the labor capacity are increased. At present, the industry has an improved mode of controlling the feeding flow by detecting the vibration quantity of the centrifugal machine, but due to the vibration of the centrifugal machine, factors including uneven feeding rate, overlarge feeding quantity, fluctuation of solid-liquid ratio of suspension, blocking and bonding of a screen, mechanical faults and the like, the feeding quantity is regulated to be passive by depending on the vibration of the centrifugal machine, and the feeding quantity is easy to deviate from the actual control requirement, so that the production efficiency is seriously influenced.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model provides the double-stage pushing centrifugal machine, which can automatically adjust the feeding quantity on line in real time and automatically control flushing, improves the notification mode of a feeding hole, not only improves the production efficiency, but also greatly improves the control precision and is more beneficial to centrifugally separating materials with high quality.

The technical purpose of the utility model is realized by the following technical scheme: the utility model provides a doublestage pushing centrifuge, includes the base and installs the motor on the base, still installs the pneumatic cylinder that is used for pushing away the material on the base, pneumatic cylinder piston rod end connection push away the flitch, the one end installation aircraft bonnet of base, the pivot of motor stretches into in the aircraft bonnet, install one-level rotary drum and second grade rotary drum in the pivot, set up one-level screen cloth and second grade screen cloth on one-level rotary drum and the second grade rotary drum respectively, be equipped with the inlet pipe to the material feeding in the one-level screen cloth on the aircraft bonnet to and provide the wash pipe of sparge water in the rotary drum, be equipped with solid bin outlet and liquid bin outlet on the aircraft bonnet, install electromagnetic flow governing valve on the inlet pipe, install electric ball valve on the wash pipe, install electromagnetic flowmeter on the liquid bin outlet, electromagnetic flow governing valve, electric ball valve and electromagnetic flowmeter all are connected with the PLC controller electricity.

Preferably, a vibration sensor is further installed at the top of the hood, and the vibration sensor is electrically connected with the PLC.

Preferably, the flushing pipe is arranged in parallel with the axis of the rotary drum, an injection head is arranged at the end part of the flushing pipe, and three groups of injection holes are formed in the injection head.

Preferably, the spray heads are arranged on a straight line forming an angle of 45 degrees with the centre line of the drum.

Preferably, the injection direction of one of the three groups of injection holes is the diameter direction of the rotary drum, and the injection directions of the other two groups of injection holes respectively form an included angle of 90 degrees and an included angle of 45 degrees with the diameter direction and are respectively positioned at two sides of the diameter direction.

Compared with the prior art, the utility model has the following beneficial effects:

1. according to the double-stage pushing centrifugal machine, the electromagnetic flow regulating valve is arranged on the feeding pipe, the electric ball valve is arranged on the flushing pipe, and meanwhile, the electromagnetic flow regulating valve and the electric ball valve are electrically connected with the control unit, so that real-time accurate control of feeding quantity is realized, and meanwhile, a flushing program can be controlled to be started or closed, so that the control efficiency is greatly improved, and the separation efficiency is further improved.

2. According to the double-stage pushing centrifugal machine, the quality of a solid layer in a material separation product can be improved through accurate control of the feeding quantity.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present utility model.

Fig. 2 is a schematic diagram of the arrangement of the ejection head in the present utility model.

In the above figures: 1. a base; 2. a hydraulic cylinder; 3. a motor; 4. a pushing plate; 5. a hood; 6. a rotating shaft; 7. a primary drum; 8. a secondary drum; 9. a first-stage screen; 10. a second-stage screen; 11. a feed pipe; 12. a flushing pipe; 13. a solid discharge port; 14. a liquid discharge port; 15. an electromagnetic flow regulating valve; 16. an electric ball valve; 17. an electromagnetic flowmeter; 18. a vibration sensor; 19. an ejection head.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1, as a preferred embodiment of the present utility model, there is provided a two-stage pusher centrifuge, comprising a base 1 and a motor 3 mounted on the base 1, a hydraulic cylinder 2 for pushing material is further mounted on the base 1, a pusher plate 4 is connected to the end of a piston rod of the hydraulic cylinder, a hood 5 is mounted at one end of the base, a rotating shaft 6 of the motor extends into the hood 5, a primary drum 7 and a secondary drum 8 are mounted on the rotating shaft 6, a primary screen 9 and a secondary screen 10 are respectively mounted on the primary drum 7 and the secondary drum 8, a feed pipe 11 for feeding water into the primary screen 9 is provided on the hood 5, and a flushing pipe 12 for providing flushing water into the drum is provided on the hood 5, a solid discharge port 13 and a liquid discharge port 14 are provided on the feed pipe 11, an electromagnetic flow regulating valve 15 is mounted on the flushing pipe 12, an electric ball valve 16 is mounted on the liquid discharge port 14, and electromagnetic flow regulating valves 15, electric ball valves 16 and electromagnetic flow regulating valves 17 are electrically connected to a PLC controller.

In some embodiments, referring to fig. 1, in order to determine the cleaning timing in combination with the vibration situation, a vibration sensor 18 is further installed on the hood top 5, and the vibration sensor 18 is electrically connected to the PLC controller.

In some preferred embodiments, referring to fig. 1, the flushing pipe 12 is arranged parallel to the axis of the drum, the end of the flushing pipe 12 is provided with an injection head 19, and the injection head 19 is provided with three groups of injection holes.

In other embodiments, referring to fig. 2, the spray heads 19 are arranged on a line that is at an angle of 45 ° to the drum centerline.

In other preferred embodiments, referring to fig. 2, in order to achieve the best cleaning effect, in this embodiment, the injection direction of one of the three sets of injection holes is the diameter direction of the drum, and the injection directions of the other two sets of injection holes respectively form an included angle of 90 ° and an included angle of 45 ° with the diameter direction, and are respectively located at two sides of the diameter direction.

In the control process, when the feeding flow is controlled, the instantaneous centrifugate of the centrifugal machine, namely, the optimal flow value of liquid materials penetrated by the screen of the centrifugal machine is calibrated according to the aperture and the area of the screen of the centrifugal machine, and the optimal flow value and the electromagnetic flow regulating valve 15 are subjected to proportional regulation and interlocking in the PLC. When the instantaneous flow rate of the centrifugal liquid at the electromagnetic flowmeter 17 is high, it can be determined that the solid content of the feed suspension is less and more or the opening of the feed valve is too large, and the PLC controller outputs a control signal to reduce the opening of the electromagnetic flow rate regulating valve 15. When the instantaneous flow rate of the centrifugal liquid at the electromagnetic flowmeter 17 is low, it can be determined that the solid content of the feed suspension is more or less or the opening of the feed valve is too small, and the PLC controller outputs a control signal to increase the opening of the electromagnetic flow rate regulating valve 15. The final adjustment opening of the electromagnetic flow rate adjusting valve 15 is based on the condition that the instantaneous flow rate at the electromagnetic flow meter 17 reaches the optimal value preset by the PLC controller.

When the electric ball valve is controlled to clean the screen, the vibration critical value is calibrated according to the normal operation data of the centrifugal machine, and the vibration critical value is interlocked with the electromagnetic flow regulating valve 15 and the electric ball valve 16 in the PLC. When the instantaneous flow of the electromagnetic flowmeter 17 is deviated to the bottom and the vibration monitoring sensor 18 reaches the vibration critical value, the two conditions are met at the same time, the material adhesion and blockage on the screen can be judged. At the moment, the PLC outputs a control signal to close the electromagnetic flow regulating valve 15, the electric ball valve 16 is opened to flush the screen, the electric ball valve is closed after timing flushing for 30 seconds, and the electromagnetic flow regulating valve 15 is opened to resume production.

Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present utility model, which is intended to be covered by the scope of the claims of the present utility model.

Claims

1. The utility model provides a doublestage pushing centrifugal machine, includes the base and installs the motor on the base, still installs the pneumatic cylinder that is used for pushing away the material on the base, pneumatic cylinder piston rod end connection push away the flitch, the one end installation aircraft bonnet of base, the pivot of motor stretches into in the aircraft bonnet, install one-level rotary drum and second grade rotary drum in the pivot, set up one-level screen cloth and second grade screen cloth on one-level rotary drum and the second grade rotary drum respectively, be equipped with the inlet pipe to the feeding in the one-level screen cloth on the aircraft bonnet to and provide the wash pipe of sparge water in the rotary drum, be equipped with solid bin outlet and liquid bin outlet on the aircraft bonnet, its characterized in that: the electromagnetic flow regulating valve is arranged on the feeding pipe, the electric ball valve is arranged on the flushing pipe, the electromagnetic flowmeter is arranged on the liquid discharge port, and the electromagnetic flow regulating valve, the electric ball valve and the electromagnetic flowmeter are all electrically connected with the PLC.

2. The dual stage pusher centrifuge of claim 1 wherein: and the top of the machine cover is also provided with a vibration sensor, and the vibration sensor is electrically connected with the PLC.

3. The dual stage pusher centrifuge of claim 1 wherein: the flushing pipe is arranged in parallel with the axis of the rotary drum, an injection head is arranged at the end part of the flushing pipe, and three groups of injection holes are formed in the injection head.

4. The dual stage pusher centrifuge of claim 3 wherein: the jet head is arranged on a straight line forming an included angle of 45 degrees with the center line of the rotary drum.

5. The dual stage pusher centrifuge of claim 3 wherein: the jet direction of one jet hole in the three groups of jet holes is the diameter direction of the rotary drum, and the jet directions of the other two groups of jet holes respectively form an included angle of 90 degrees and an included angle of 45 degrees with the diameter direction and are respectively positioned at two sides of the diameter direction.