A method for low power start-up of a ball mill

Abstract

This invention proposes a method for starting a ball mill under low power conditions, comprising the following steps: Step 1, turning off all electrical appliances unrelated to the test run; Step 2, starting the hydraulic system to allow lubricating oil to enter the ball mill journal and form an oil film, causing the ball mill cylinder to be suspended above the oil film and remain stationary for a certain period of time; Step 3, after the ball mill has been stationary for a certain period of time, marking the lowest point on the end face of the ball mill; Step 4, rotating the ball mill cylinder, and after the cylinder has rotated a certain angle, placing a wooden board between the teeth of the large gear on the cylinder and the ground; This invention shifts the center of gravity of the ball mill by a certain angle, causing the cylinder to rotate under its own gravity and inertia, while simultaneously coordinating with the main motor to drive the pneumatic clutch to drive the small gear to rotate, thus ultimately achieving the effect of the main motor driving the cylinder to rotate, completing the test run of the ball mill under low current load, and avoiding power outages.

Description

Technical Field

[0001] This invention belongs to the field of ball mill technology, specifically relating to a method for starting a ball mill with low power consumption. Background Technology

[0002] A ball mill is a key piece of equipment for further pulverizing materials after they have been crushed. A ball mill consists of a horizontal cylinder, hollow inlet and outlet shafts, and grinding heads. The cylinder is a long cylindrical structure made of steel plate, fixed to the cylinder by steel liners. A certain number of steel balls are loaded inside the cylinder in different diameters and proportions, selected according to the particle size of the material to be ground. The material is fed into the cylinder through the hollow inlet shaft. As the ball mill cylinder rotates, the grinding media, due to inertia, centrifugal force, and friction, adhere to the cylinder liner and are carried away by the cylinder. When carried to a certain height, they are thrown down by their own gravity, and the falling grinding media, like projectiles, crush the material inside the cylinder.

[0003] Currently, most places have a substation that matches the ball mill. However, in some special cases, such as near a mine, a substation cannot be built because the high voltage power is not connected to the site in time. This will cause the ball mill to trip and lose power when it is started during the trial run after it is installed, thus preventing the ball mill from starting normally. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a method for starting a ball mill with low power consumption. After shifting the ball mill's center of gravity by a certain angle, the mill body rotates under its own gravity and inertial force. Simultaneously, the main motor drives a pneumatic clutch, which in turn drives a pinion gear. Ultimately, this achieves the effect of the main motor driving the mill body to rotate, enabling trial operation of the ball mill under low current load and avoiding power outages.

[0005] The technical solution adopted in this invention is: a method for starting a ball mill with low power consumption, comprising the following steps:

[0006] Step 1: Turn off all electrical appliances that are not related to the test run;

[0007] Step 2: Start the hydraulic system to allow lubricating oil to enter the ball mill journal and form an oil film, so that the ball mill cylinder is suspended above the oil film and remains stationary for a certain period of time.

[0008] Step 3: After the ball mill has been stationary for a certain period of time, mark the lowest point on the end face of the ball mill.

[0009] Step 4: Rotate the ball mill cylinder. After the cylinder has rotated to a certain angle, place a wooden board between the teeth of the large gear on the cylinder and the ground. Use the wooden board as a support to keep the cylinder stationary at that angle.

[0010] Step 5: Start the main motor pneumatic clutch, causing the pneumatic clutch to engage the pinion gear and rotate. At the same time, remove the support board from Step 4. As the cylinder rotates, the main motor drives the pneumatic clutch to engage the pinion gear and rotate, thus starting the ball mill under low current load.

[0011] In step four, the overhead crane is used as a power source to drive the ball mill cylinder to rotate, and the rotation direction of the cylinder is the opposite of the normal rotation direction of the cylinder.

[0012] In step four, the rotation angle of the cylinder relative to the stationary state in step three is 170°-175°.

[0013] The beneficial effects of this invention are as follows:

[0014] After the center of gravity of the ball mill is shifted by a certain angle, the cylinder rotates under its own gravity and inertia. At the same time, the main motor drives the pneumatic clutch to drive the pinion gear to rotate, thus achieving the effect of the main motor driving the cylinder to rotate. This completes the trial operation of the ball mill under low current load and avoids the occurrence of power outages. Attached Figure Description

[0015] Figure 1 This is a perspective view of the ball mill of the present invention;

[0016] Figure 2 This is a schematic diagram of the ball mill cylinder of the present invention in a suspended and stationary state;

[0017] Figure 3 This is a schematic diagram of the ball mill cylinder of the present invention rotating at a certain angle and supported by a wooden board.

[0018] The markings in the diagram are: 1. Cylinder; 2. Large gear; 3. Small gear; 4. Shaft seat; 5. Wooden board. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figure 1-3 As shown, a method for starting a ball mill with low power includes the following steps:

[0021] Step 1: Turn off all electrical appliances that are not related to the test run;

[0022] Step 2: Start the hydraulic system to allow lubricating oil to enter the ball mill journal and form an oil film, so that the ball mill cylinder 1 is suspended above the oil film and remains stationary for a certain period of time; Figure 1 As shown, the journals at both ends of the ball mill cylinder 1 are mounted on the bearing seats 4, and the bearing bushes are installed inside the bearing seats 4. The lubrication pump pumps lubricating oil into the space between the bearing bushes and the journals of the cylinder 1, thereby forming an oil film and keeping the cylinder 1 suspended. This technology for suspending the cylinder 1, the hydraulic system, and the lubrication circuit technology are conventional structures in the existing technology and will not be described in detail here.

[0023] Step 3: After the ball mill has been stationary for a certain period of time, mark the lowest point on the end face of the ball mill; that is, with the ball mill cylinder 1 suspended, ensure that the center of gravity of the cylinder 1 is at the lowest position, and then use mark a to mark the center of gravity (e.g., ...). Figure 2 As shown in the figure, once the center of gravity is confirmed, it provides an indicator for subsequent steps, so that the staff can observe the location of the center of gravity of cylinder 1.

[0024] Step 4, as follows Figure 3 As shown, the ball mill cylinder 1 is rotated. Specifically, the ball mill cylinder 1 is driven to rotate by a crane as a power source. The rotation direction of the cylinder 1 is the opposite of the normal rotation direction of the cylinder 1.

[0025] After the cylinder 1 rotates by a certain angle, the rotation angle of the cylinder 1 relative to the stationary state in step three is 170°-175°, that is... Figure 3 In this case, the included angle of β is 170°-175°, and in this example, the included angle is specifically 175°.

[0026] like Figure 3 As shown, the wooden board 5 is placed between the teeth of the large gear 2 on the cylinder 1 and the ground, using the wooden board 5 as a support to keep the cylinder 1 stationary at this angle.

[0027] The purpose of rotating cylinder 1 by 175° is to raise the center of gravity of cylinder 1 to a sufficient height, thereby creating a certain drop. When the support is removed, cylinder 1 can have a high initial rotational speed after its center of gravity falls from the high point under its own gravity, so as to meet the speed requirements for subsequent ball mill startup.

[0028] Step 5: Activate the main motor pneumatic clutch, causing it to engage the pinion 3 and rotate. Simultaneously, remove the support board 5 from Step 4. As the cylinder 1 rotates, the main motor drives the pneumatic clutch to rotate the pinion 3, thus starting the ball mill with a low current load. In this step, the pneumatic clutch is activated simultaneously with the removal of the board 5, meaning the cylinder 1 rotates synchronously with the pneumatic clutch. This avoids gear damage caused by the large gear 2 rotating while the pinion 3 remains stationary. Furthermore, the cylinder 1's relatively constant speed reduces the current load required for main motor startup, preventing power outages and meeting the requirements for ball mill trial operation.

[0029] After actual testing, this method can meet the requirements for ball mill trial operation in situations where no high-voltage substation is set up, and achieve normal start-up of the ball mill.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for starting a ball mill with low power consumption, characterized in that, Includes the following steps: Step 1: Turn off all electrical appliances that are not related to the test run; Step 2: Start the hydraulic system to allow lubricating oil to enter the ball mill journal and form an oil film, so that the ball mill cylinder is suspended above the oil film and remains stationary for a certain period of time. Step 3: After the ball mill has been stationary for a certain period of time, mark the lowest point on the end face of the ball mill. Step 4: Rotate the ball mill cylinder. After the cylinder has rotated to a certain angle, place a wooden board between the teeth of the large gear on the cylinder and the ground. Use the wooden board as a support to keep the cylinder stationary at that angle. In Step 4, use an overhead crane as a power source to drive the ball mill cylinder to rotate. The direction of rotation of the cylinder is the opposite of the normal rotation direction of the cylinder. The rotation angle of the cylinder relative to the stationary state in Step 3 is 170°-175°. Step 5: Start the main motor pneumatic clutch, causing the pneumatic clutch to engage the pinion gear and rotate. At the same time, remove the support board from Step 4. As the cylinder rotates, the main motor drives the pneumatic clutch to engage the pinion gear and rotate, thus starting the ball mill under low current load.

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