Method for improving material handling capacity of double-motor centrifugal machine

Abstract

The invention aims to provide a method for improving the material handling capacity of a double-motor centrifugal machine, and belongs to the technical field of separation of solid-phase and liquid-phase materials such as soil and slurry. The rotating speed of the spiral pusher is larger than that of the rotary drum, and the rotating speed of the input end of the differential mechanism is larger than that of the rotary drum. The power of the main motor is completely applied to the rotary drum, the power of the auxiliary motor is applied to the spiral pusher, the total power of the centrifugal machine is the sum of the power of the main motor and the power of the auxiliary motor, the handling capacity of materials is greatly improved, or under the condition of the same handling capacity, the energy consumption needed by the two motors is reduced, and the equipment and operation cost is saved.

Description

Technical Field

[0001] The invention relates to the technical field of separation of materials containing solid and liquid phases such as soil and mud, and in particular to a method for improving the material processing capacity of a horizontal spiral dual-motor centrifuge. Background Art

[0002] The horizontal spiral centrifuge mainly achieves solid-liquid separation of materials such as soil and mud by achieving a certain centrifugal force at a rotation speed, so that the solid phase and liquid phase of the separated soil and other materials meet the recycling requirements or discharge requirements. As we all know, the dual-motor centrifuge mainly includes a main motor, an auxiliary motor, a screw pusher, a drum and a differential. Among them, the main motor is connected to the drum through a power transmission belt, the drum is connected to the housing of the differential, the output shaft of the differential is connected to the screw pusher, and the auxiliary motor is connected to the input shaft of the differential through a power transmission belt. At present, in the traditional dual-motor centrifuge, the main motor drives the drum to rotate through the transmission belt, the auxiliary motor drives the screw pusher to rotate through the differential, the drum and the screw pusher rotate in the same direction, and the drum speed is greater than the speed of the screw pusher. There is a speed difference between the two under the action of the differential, and then the solid phase of the material separation is pushed to the small end of the drum by the screw pusher and discharged from the solid phase discharge port, and the liquid phase of the material separation is discharged through the spiral channel through the liquid phase discharge port, thereby realizing the production process of continuous solid-liquid separation.

[0003] In the actual working process of the existing dual-motor centrifuge, the main motor drives the drum, while the drum shell drives the differential, and the auxiliary motor drives the screw pusher through the differential. Since the speed of the screw pusher is lower than the speed of the drum, the differential drives the auxiliary motor to rotate passively. At this time, the main motor not only drives the drum and the screw pusher, but also drags the auxiliary motor to rotate. The auxiliary motor even needs to do work to offset the work of the main motor's reverse drag, making the total power of the centrifuge the difference between the main motor power and the auxiliary motor power. In addition to making the main motor power unable to be fully applied to the drum, the power of the auxiliary motor is also unable to be fully applied, which in turn affects the material processing capacity. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for improving the material processing capacity of a dual-motor centrifuge. The method comprises the following steps: the rotation speed of the screw pusher is greater than the rotation speed of the drum, and the rotation speed of the differential input end is greater than the rotation speed of the drum. The power of the main motor is fully applied to the drum, and the power of the auxiliary motor is applied to the screw pusher. The total power of the centrifuge is the sum of the power of the main motor and the power of the auxiliary motor, thereby greatly improving the material processing capacity.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a method for improving the material processing capacity of a dual-motor centrifuge, wherein the main motor drives the drum to rotate, the drum is connected to the housing of the differential, the auxiliary motor is connected to the input end of the differential, the output end of the differential is connected to the screw pusher, the drum and the screw pusher rotate in the same direction and there is a differential speed between the two, the speed of the screw pusher is greater than the speed of the drum, and the speed of the differential input end is greater than the speed of the drum.

[0006] As an improvement of the present invention, the differential speed is the ratio of the difference between the drum speed and the input end speed of the differential to the differential speed ratio of the differential; The drum speed is 2800r / min, the differential input speed is 4698r / min, and the differential ratio is 57:1.

[0007] As an improvement of the present invention, the rotation speed of the auxiliary motor is greater than the rotation speed of the main motor.

[0008] As an improvement of the present invention, the material is mud, the mud specific gravity is 1.1, and the viscosity is 45S; The power of the main motor is 37 kW, and the power of the auxiliary motor is 11 kW.

[0009] The beneficial effects of the present invention are: a method for improving the material processing capacity of a dual-motor centrifuge, wherein the rotation speed of the screw pusher is greater than the rotation speed of the drum, and the rotation speed of the differential input end is greater than the rotation speed of the drum. The power of the main motor is fully applied to the drum, and the power of the auxiliary motor is applied to the screw pusher, so that the total power of the centrifuge is the sum of the power of the main motor and the power of the auxiliary motor, which greatly improves the material processing capacity, or under the same processing capacity, the energy consumption required by the two motors is reduced, saving equipment and operation costs.

[0010] Furthermore, the differential speed is the ratio of the difference between the drum speed and the input speed of the differential to the differential ratio of the differential; the drum speed is 2800r / min, the input speed of the differential is 4698r / min, and the differential ratio is 57: 1. Through the above design, the differential speed is about 33.3r / min, so that the solid-liquid separation effect of the material reaches the best state, and the solid and liquid phases of the separated soil, mud and other materials meet the recycling requirements or discharge requirements.

[0011] Furthermore, the rotation speed of the auxiliary motor is greater than that of the main motor. By designing the rotation speed of the auxiliary motor to be greater than that of the main motor, since the rotation speed of the differential input end is greater than the drum rotation speed, the transmission ratio structure between the auxiliary motor and the differential input end is simpler, the manufacturing is convenient, and the equipment cost is low.

[0012] It should be noted that in the existing dual-motor centrifuge material processing method, in order to increase the material processing capacity, most of them are achieved by selecting a higher power motor, which not only increases the equipment cost, but also takes up more physical space. However, this application breaks the convention, and increases the material processing capacity by using the same power motor, or reduces the energy consumption of the two motors under the same processing capacity, saving equipment and operating costs. DETAILED DESCRIPTION

[0013] A method for improving the material handling capacity of a dual-motor centrifuge, wherein the main motor drives the drum to rotate, the drum is connected to the housing of a differential, the auxiliary motor is connected to the input end of the differential, the output end of the differential is connected to a screw pusher, the drum and the screw pusher rotate in the same direction and there is a differential speed between the two, the speed of the screw pusher is greater than the speed of the drum, and the speed of the differential input end is greater than the speed of the drum. Preferably, a hydraulic coupler is installed on the output shaft of the main motor, the hydraulic coupler is connected to the drum end on one side thereof through a power transmission belt, and the output shaft of the auxiliary motor is connected to the input end of the differential through the power transmission belt.

[0014] It should be noted that the above dual-motor centrifuge belongs to existing known equipment, such as a dual-motor centrifuge disclosed in Chinese patent CN213644534U, and its specific structure will not be introduced in detail here.

[0015] The following takes mud with a specific gravity of 1.1 and a viscosity of 45S as the treatment object, and takes a dual-motor centrifuge with a main motor power of 37kW and an auxiliary motor power of 11kW as an example, and conducts experimental analysis on the above materials through the existing material treatment method and the material treatment method of the present application: 1. The above materials are processed by the existing known method. It is known that the drum speed is 2800r / min, the differential input speed is 900r / min, the differential ratio is 57:1, and the differential speed is about 33.3r / min. The material processing conditions are as follows: When the processing capacity is 28 cubic meters, the main motor current is 84A and the auxiliary motor current is -11A. At this time, the processing capacity cannot be increased any more and the main motor current has exceeded its rated current.

[0016] When the processing capacity is 24 cubic meters, the main motor current is 73A and the auxiliary motor current is -11A. At this time, the processing capacity is the maximum processing capacity of the centrifuge.

[0017] It should be noted that with the improvement of the automation level of measurement products, the current measuring equipment has developed from the original ammeter (the ammeter cannot detect the motor current as a negative value) to the current intelligent online current monitoring equipment. It is found that the auxiliary motor current displayed on the HMI is a negative value, indicating that the auxiliary motor is not actually doing work.

[0018] 2. The above materials are processed by the method of this application. It is known that the drum speed is 2800r / min, the speed of the differential input end is 4698r / min, and the differential ratio is 57:1. At this time, the differential speed is about 33.3r / min. The material processing conditions are as follows: When the processing capacity is 42 cubic meters, the main motor current is 83A and the auxiliary motor current is 17A. At this time, the current value of the main motor is similar to that of the traditional centrifuge processing method, but the processing capacity far exceeds that of the traditional centrifuge.

[0019] When the processing volume is 28 cubic meters, the main motor current is 63A and the auxiliary motor current is 8A. At this time, the main motor current does not reach the rated current.

[0020] When the processing capacity is 35 cubic meters, the main motor current is 73A and the auxiliary motor current is 10A. At this time, the processing capacity is the maximum processing capacity of the centrifuge.

[0021] In summary, through the comparison between 1 and 2 above, it can be seen that after the same material is processed by the method of the present application, the material processing capacity is greatly improved compared with the existing method, or under the same processing capacity, the energy consumption required by the two motors is reduced, saving equipment and operating costs.

[0022] The above is a detailed introduction to a method for improving the material processing capacity of a dual-motor centrifuge provided by the present invention. Specific examples are used in this article to illustrate the structural principles and implementation methods of the present invention. The above embodiments are only used to help understand the method of the present invention and its core ideas. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for improving the material handling capacity of a dual-motor centrifuge, wherein the main motor drives the drum to rotate, the drum is connected to the housing of the differential, the auxiliary motor is connected to the input end of the differential, the output end of the differential is connected to the screw pusher, the drum and the screw pusher rotate in the same direction and there is a differential speed between the two, characterized in that: The rotation speed of the screw pusher is greater than the rotation speed of the drum, and the rotation speed of the input end of the differential is greater than the rotation speed of the drum.

2. A method for increasing the material handling capacity of a dual-motor centrifuge according to claim 1, characterized in that: The differential speed is the ratio of the difference between the drum speed and the input end speed of the differential to the differential speed ratio of the differential; The drum speed is 2800r / min, the differential input speed is 4698r / min, and the differential ratio is 57:

1.

3. A method for increasing the material handling capacity of a dual-motor centrifuge according to claim 1, characterized in that: The rotation speed of the auxiliary motor is greater than the rotation speed of the main motor.

4. A method for increasing the material handling capacity of a dual-motor centrifuge according to claim 1, characterized in that: The material is mud, the mud specific gravity is 1.1, and the viscosity is 45S; The power of the main motor is 37 kW, and the power of the auxiliary motor is 11 kW.