Method for detecting internal stress of hot-rolled ball mill steel ball

Abstract

The application discloses a method for detecting internal stress of hot-rolled ball mill steel balls, which comprises the following steps: clamping the periodically extracted steel balls through a turnover positioning plate and a blocking plate, performing wire cutting, turning over the half steel balls after the wire cutting to make the cutting surfaces face upwards for detection by a camera, and dropping the steel balls after the detection into a collecting trolley for recycling. The method for detecting internal stress of hot-rolled ball mill steel balls can realize unmanned operation, greatly improves the detection efficiency, saves the labor cost and reduces the production cost of enterprises.

Description

TECHNICAL FIELD

[0001] The present application relates to an internal stress detection method, in particular to a method for automatically detecting the internal stress of hot-rolled ball mill steel balls. BACKGROUND

[0002] At present, hot-rolled wear-resistant steel balls gradually replace cast balls as the preferred ball mill steel balls in the mining industry because they have precise dimensions, round geometry, high hardness and good mechanical properties, as well as excellent qualities such as wear resistance, non-deformation and non-cracking. In order to improve the wear resistance of hot-rolled steel balls, people have begun to optimize their internal stress by increasing the carbon content. Compared with conventional ordinary hot-rolled steel balls, high-carbon content steel balls require more stringent process conditions, so after tempering, the finished steel balls need to be sampled to determine whether the production conditions meet the requirements.

[0003] Nowadays, when sampling hot-rolled steel balls, they are usually picked up by hand or grabbed by a mechanical hand to send them to the detection belt for cutting. After cutting, the cut surface is photographed to analyze the internal metallographic structure. The whole process is inefficient, requires multiple people to cooperate, and affects work efficiency, increasing production costs. Therefore, our company has developed an automatic detection method to solve the above problems. SUMMARY

[0004] The purpose of the present application is to overcome the above-mentioned deficiencies and provide a hot-rolled ball mill steel ball internal stress detection method with high detection efficiency and low cost.

[0005] The purpose of the present application is achieved as follows:

[0006] A hot-rolled ball mill steel ball internal stress detection method, the method comprises the following steps:

[0007] Extracting steel balls: during the process of transporting the tempered steel balls to the cooling ball table through the cooling channel plate, a guide channel is connected in series on the cooling channel plate, and steel balls are periodically extracted through the periodically opened detection port at the bottom of the guide channel. After falling through the detection port, the extracted steel balls are guided through the arc-shaped detection channel and then roll onto the horizontally arranged detection plate;

[0008] Cutting detection: the steel ball hits the vertically arranged stop plate on the detection plate to stop, and a trigger signal is sent by the vibration sensor installed on the stop plate during the process of hitting the stop plate;

[0009] After receiving the trigger signal, the controller starts the turnover cylinder to make the previously horizontally arranged turnover positioning plate turn clockwise by 90°, and then clamps the steel ball with the turnover positioning plate and the stop plate;

[0010] The controller starts the wire cutting machine above the detection plate 5-10 seconds after receiving the trigger signal, and cuts the steel ball into two halves by using the wire cutting machine; at this time, the half of the steel ball adhered to the blocking plate falls into the material collecting trolley through the dropping slot on the detection plate for recycling;

[0011] The controller starts the turning cylinder again 70-80 seconds after receiving the trigger signal, so that the turning positioning plate turns 90° counterclockwise with the half of the steel ball cut, and the cutting surface of the steel ball faces the camera above it;

[0012] The controller starts the camera to take pictures of the cutting surface of the steel ball for detection 85-90 seconds after receiving the trigger signal, and the detection time is 5-15 seconds;

[0013] The controller starts the turning cylinder again 90-105 seconds after receiving the trigger signal, so that the turning positioning plate turns 90° clockwise, and the half of the steel ball detected falls into the material collecting trolley through the dropping slot on the detection plate for recycling, and then the turning cylinder drives the turning positioning plate to rotate 90° counterclockwise to reset.

[0014] Preferably, at the same time of starting the wire cutting machine, the air chamber in the turning positioning plate starts to be vacuumized, and then the air hole connected with the air chamber adsorbs the steel ball;

[0015] After the camera completes the detection, the air chamber of the turning positioning plate stops vacuumizing, so that when the turning positioning plate is turned to the vertical state again, the half of the steel ball detected can fall smoothly.

[0016] Preferably, the blocking plate in the detection process is pushed to translate by a translation advancing mechanism;

[0017] When the turning cylinder drives the turning positioning plate to turn 90° clockwise to the vertical state for the first time, the translation advancing mechanism pushes the blocking plate to move towards the turning positioning plate, so that the clamping force on the steel ball is greater;

[0018] When the wire cutting machine cuts the steel ball into two halves, the translation advancing mechanism pushes the blocking plate to move away from the turning positioning plate, so that the steel ball abutting against the blocking plate after cutting can fall more easily.

[0019] Preferably, a limiting groove is arranged on the turning positioning plate, and the air hole connected with the air chamber is located in the limiting groove; a positioning groove corresponding to the limiting groove is arranged on the blocking plate, and when the turning positioning plate and the blocking plate clamp the steel ball, the left and right ends of the steel ball are respectively embedded in the limiting groove and the positioning groove.

[0020] Preferably, the bottom of the guide channel is hinged with a flap, the connecting rod on the side wall of the flap passes through the arc-shaped structure sliding groove on the side wall of the guide channel and then leads out, and the connecting rod leads out to a eccentric wheel driven by a power mechanism and rests on the eccentric wheel, so that the periodic turning of the flap is realized through the eccentric wheel, and then the periodic opening and closing of the detection port is realized.

[0021] Compared with the prior art, the beneficial effects of the present application are:

[0022] The present application realizes the sampling inspection of steel balls by periodically opening the detection port, which is more efficient and saves a lot of labor cost compared with manual mode; meanwhile, the blocking plate and the turnover positioning plate realize the clamping and positioning of the detected steel balls, which realizes automatic control and greatly reduces the labor cost; in addition, the vacuum adsorption mode is used to prevent the half of the steel balls to be detected from falling off and ensure the stability of the steel balls during the detection by the camera, thereby ensuring the detection accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 Fig. 1 is a structural schematic diagram of the automatic sampling inspection system of the present application.

[0024] Figure 2 Fig. 3 is a structural schematic diagram of the driving mechanism of the flap in the automatic sampling inspection system of the present application.

[0025] Figure 3 Fig. 4 is a partial schematic diagram of the guide channel in the automatic sampling inspection system of the present application.

[0026] Figure 4 Fig. 5 is a partial sectional view of the guide channel in the automatic sampling inspection system of the present application.

[0027] Figure 5 Fig. 6 is a partial enlarged schematic diagram of the cutting and detection mechanism in the automatic sampling inspection system of the present application.

[0028] Figure 6 Fig. 7 is a sectional view of the turnover positioning plate in the automatic sampling inspection system of the present application.

[0029] Among them:

[0030] Cooling channel plate 11, guide channel 12, eccentric wheel 13, detection channel 14, connecting rod 15, arc-shaped block 16, flap 17, sliding groove 18, motor reducer assembly 19, detection port 20, clamping groove 21, detection plate 22, turnover positioning plate 23, blocking plate 24, blanking groove 25, material collecting trolley 26, vacuumizing device 27, connecting pipe 28, turnover cylinder 29, limiting groove 30, air hole 31, air chamber 32, camera 33, wire cutting machine 34. DETAILED DESCRIPTION

[0031] See Figures 1-6 The present application relates to a kind of internal stress detection methods of hot rolling ball mill steel ball, the method is:

[0032] Extract steel ball: the process of steel ball after tempering is transported to the cooling ball platform by cooling channel plate 11, in the cooling channel plate 11 series connection guide channel 12, and periodically extracted steel ball by the detection port 20 periodically opened in the bottom of guide channel 12, after the steel ball extracted via detection port 20 falls and is guided by the detection channel 14 of arc structure and then rolls to the detection plate 22;

[0033] Cutting detection: steel ball impacts the blocking plate 24 vertically arranged on the detection plate 22, and the trigger signal is triggered by the vibration sensor installed on the blocking plate 24 in the process of impacting the blocking plate 24, the controller can start the turnover cylinder 29 after receiving the trigger signal, so that the turnover positioning plate 23 originally horizontally arranged is turned clockwise by 90°, and the steel ball is clamped by the turnover positioning plate 23 and the blocking plate 24, and the controller starts the wire cutting machine 34 above the detection plate 22 after receiving the trigger signal for 5~10s, and the steel ball is cut into two halves by the wire cutting machine 34, and the air chamber 32 in the turnover positioning plate 23 starts to vacuum after the wire cutting machine 34 is started, and the steel ball is adsorbed by the air hole 31 connected with the air chamber 32; the controller receives the trigger signal for 70~80 seconds, and then starts the turnover cylinder 29 with the half steel ball after cutting, and the cutting surface of the steel ball is opposite to the camera 33 after being turned counterclockwise by 90°, the controller starts the camera 33 to shoot the cutting surface of the steel ball for detection after receiving the trigger signal for 85~90s, and the detection time is 5~15s, then the controller starts the turnover cylinder 29 again to make the turnover positioning plate 23 rotate clockwise by 90°, and at the same time, the air chamber 32 is inflated, so that the steel ball after detection falls from the turnover positioning plate 23, passes through the discharge slot 25 on the detection plate 22 downward, and then falls into the collection trolley 26 for recycling, and finally the turnover cylinder 29 is rotated counterclockwise by 90° to reset.

[0034] Specifically:

[0035] The above method is an automatic detection system, a guide channel 12 is connected in series on the cooling channel plate 11, a detection port 20 is arranged at the bottom of the guide channel 12, a turnover plate 17 is hinged on the detection port 20, and the turnover plate 17 is periodically turned by the driving mechanism to control the opening and closing of the detection port 20, an arc-shaped detection channel 14 is connected below the detection port 20, the top opening of the detection channel 14 is located below the detection port 20 (preferably, the detection channel 14 is fixedly connected to the outer wall of the guide channel 12), and the bottom opening of the detection channel 14 extends horizontally to form a detection plate 22, so that the steel ball falling through the detection port 20 can roll to the detection plate 22 along the detection channel 14 and then be cut and detected by the cutting detection mechanism.

[0036] The specific structure of the cutting detection mechanism is that a through-length blanking groove 25 is arranged on the detection plate 22, the width of the blanking groove 25 is between the radius and the diameter of the steel ball, a blocking plate 24 is vertically arranged on the detection plate 22 (preferably, a translation advancing mechanism such as a pneumatic cylinder, an electric push rod, a screw nut, etc. is arranged on the detection plate 22, the extension end of the translation advancing mechanism is connected with the detection plate 22; the translation advancing mechanism is arranged to facilitate the adjustment of the distance when the system is applied to different specifications of steel balls, and to facilitate the blanking of the steel ball after cutting; at this time, the translation advancing mechanism drives the blocking plate 24 to move backward to easily make the half steel ball fall downward), the bottom of a turnover positioning plate 23 is hinged to the detection plate 22; when the steel ball rolls on the detection plate 22 and rolls over the turnover positioning plate 23 which is turned to a horizontal state, the steel ball hits the blocking plate 24, and then the turnover mechanism drives the turnover positioning plate 23 to turn to a vertical state to clamp the steel ball. Specifically, the turnover mechanism is a turnover pneumatic cylinder 29, the cylinder seat of the turnover pneumatic cylinder 29 is hinged to a support, the support is fixed to the bottom of the detection plate 22, and the piston rod of the turnover pneumatic cylinder 29 penetrates through the blanking groove 25 and is hinged to the bottom surface of the turnover pneumatic cylinder 29. Preferably, the turnover positioning plate 23 is provided with a limiting groove 30 with a spherical crown structure (or a pit structure) for clamping the steel ball to achieve limiting and fixing when the steel ball is embedded, meanwhile, the turnover positioning plate 23 is further provided with a gas chamber 32, and the limiting groove 30 is provided with a plurality of gas holes 31 which are in communication with the gas chamber 32, and the gas chamber 32 is in communication with a vacuumizing device 27 through a connecting pipe 28. Thus, when the blocking plate 24 and the turnover positioning plate 23 clamp the steel ball (in order to improve the stability during clamping, a positioning groove corresponding to the limiting groove 30 can be arranged on the blocking plate 24, so that the clamping is more stable during operation), the vacuumizing device 27 is started to make the gas chamber 32 in negative pressure, so that after the steel ball is cut by a wire cutting machine 34 above the detection plate 22, the turnover positioning plate 23 adsorbs the half steel ball, then the turnover positioning plate 23 drives the half steel ball adsorbed thereby to make the cutting surface of the steel ball face upward and face the camera 33 above the cutting surface for image detection; at the same time, the other half of the steel ball on the blocking plate 24 falls downward under the action of its own gravity, penetrates through the blanking groove 25 and falls into a material collecting trolley 26 below. When the camera 33 finishes detection, the vacuumizing device 27 stops working and reversely ventilates, at this time, the turnover positioning plate 23 is turned to a vertical state, at this time, the half steel ball also falls downward under the action of gravity, penetrates through the blanking groove 25 and falls into the material collecting trolley 26 below, then the turnover positioning plate 23 is turned to a horizontal state again to perform the next round of detection.In the process of rolling of the steel ball, the blocking plate 24 blocks it due to its high speed, and at the same time, the impact signal can be used as a starting signal (achieved by using a vibration sensor), when vibration occurs, the turnover cylinder 29 is started to turn over the clamping steel ball; and the top of the turnover positioning plate 23 is provided with a unique slope surface, through which the front of the steel ball can be conveniently blocked, and the slope surface can play a certain buffering role on the speed of the steel ball, especially for large volume steel balls, which can effectively avoid the impact force of the blocking plate 24 caused by the excessive speed of the steel ball; or when the steel ball is a small volume steel ball, a recess capable of accommodating the turnover positioning plate 23 is arranged on the detection plate 22, so that when the turnover positioning plate 23 is horizontal, the top surface of the turnover positioning plate 23 is flush with the top surface of the detection plate 22.

[0037] Preferably, the driving mechanism of the turnover plate 17 can be a stepping motor controlled by PCL, and the motor shaft of the stepping motor is connected with the rotation of the bottom of the turnover plate 17 through a shaft coupling, so as to periodically drive the turnover plate 17 to turn over upward to open the detection port 20 by the stepping motor, so that the steel ball falls downward to the detection channel 14, and after 3-5 seconds after opening, the stepping motor is reversed to drive the turnover plate 17 to turn over in the opposite direction to close the detection port 20.

[0038] Or the drive mechanism can also use the mechanical periodic control scheme in the embodiment, the advantage of the scheme is that the opening and closing period is controlled purely mechanically, which is not easy to fail, and the structure is more simple and reliable. At this time, the drive mechanism includes a motor reducer assembly 19 and an eccentric wheel 13 driven by the motor reducer assembly 19, the motor reducer assembly 19 is installed outside the guide channel 12, an arc-shaped chute 18 is arranged on the side wall of one side of the guide channel 12 (that is, the side wall of the side on which the motor reducer assembly 19 is installed is provided with the chute 18), one end of the flap 17 is hinged at the detection port 20, the side wall of the flap 17 is connected with a connecting rod 15, the connecting rod 15 passes through the chute 18 and rests on the eccentric wheel 13; so that when the motor reducer assembly 19 drives the eccentric wheel 13 to rotate one revolution, the opening and closing of the flap 17 can be completed, and the opening period can be controlled by controlling the rotating speed of the motor reducer assembly 19. Preferably, the guide channel 12 is provided with an arc-shaped clamping block 16 at the end close to the detection port 20 and away from the hinge point of the flap 17 and the guide channel 12, the purpose of arranging the arc-shaped clamping block 16 is to block the subsequent steel balls instantaneously while the detection port 20 is opened to drop the steel balls, so as to avoid dropping excess steel balls, and the arc-shaped clamping block 16 is also arranged on the end of the flap 17 away from the hinge point of the flap 17 and the guide channel 12, so as to play a role in gently falling the lifted steel balls, avoiding impacting the flap 17 and affecting its service life. At the same time, the top of the guide channel 12 is recessed upward to form a clamping groove 21, so as to avoid the flap 17 from being stuck when it is opened, that is, the steel balls on the flap 17 that have not rolled to the rear cooling channel plate 11 in time play a role in temporary storage space, ensuring smooth operation of detection.

[0039] In addition: It should be noted that the above specific embodiments are only an optimized scheme of the patent, and any changes or improvements made by those skilled in the art based on the above concept are within the protection scope of the patent.

Claims

1. A method for detecting the internal stress of hot-rolled ball mill steel balls, characterized in that: The method is as follows: Steel ball extraction: During the process of transporting the tempered steel balls to the cooling ball table through the cooling channel plate, a guide channel is connected in series on the cooling channel plate, and the steel balls are periodically extracted through the periodically opened detection port at the bottom of the guide channel. After the extracted steel balls fall through the detection port, they are guided by the arc-shaped detection channel and roll onto the horizontally set detection plate. Cutting inspection: The steel ball stops when it hits the vertically set baffle on the inspection plate. During the impact with the baffle, a vibration sensor installed on the baffle sends a trigger signal. Once the controller receives the trigger signal, it can activate the tilting cylinder to rotate the originally horizontally positioned tilting positioning plate 90° clockwise, and then use the tilting positioning plate and the blocking plate to hold the steel ball. 5-10 seconds after receiving the above trigger signal, the controller starts the wire cutting machine located above the detection plate. At the same time as starting the wire cutting machine, the air chamber inside the flip positioning plate begins to be evacuated and the steel ball is adsorbed by the air hole connected to the air chamber. The wire cutting machine cuts the steel ball into two halves. At this time, the half of the steel ball attached to the baffle plate passes down through the material drop chute on the detection plate and falls into the collection trolley for recycling. 70-80 seconds after receiving the above trigger signal, the controller restarts the flip cylinder, causing the flip positioning plate to rotate 90° counterclockwise with the cut half of the steel ball, so that the cut surface of the steel ball is facing the camera above it. After receiving the above trigger signal for 85-90 seconds, the controller starts the camera to detect the cut surface of the steel ball, and the detection time is 5-15 seconds. After receiving the trigger signal for 90-105 seconds, the controller will start the tilting cylinder again to drive the tilting positioning plate to rotate 90° clockwise, so that the half of the steel ball that has been tested will fall downward through the material drop chute on the testing plate and fall into the collection trolley for recycling. Then the tilting cylinder will drive the tilting positioning plate to rotate 90° counterclockwise to reset.

2. The method for detecting internal stress in hot-rolled ball mill steel balls according to claim 1, characterized in that: After the camera finishes its inspection, the air chamber of the flip positioning plate stops being evacuated, allowing the inspected half of the steel ball to fall smoothly when the flip positioning plate flips back to the vertical position.

3. The method for detecting internal stress in hot-rolled ball mill steel balls according to claim 1, characterized in that: The blocking plate in the detection process is moved by a translation propulsion mechanism; When the flipping cylinder drives the flipping positioning plate to rotate 90° clockwise to the vertical position for the first time, the translation and propulsion mechanism pushes the blocking plate to move towards the flipping positioning plate, thereby increasing the clamping force on the steel ball. After the wire cutting machine cuts the steel ball in half, the translation and propulsion mechanism pushes the baffle plate away from the flipping positioning plate, making it easier for the steel ball that is against the baffle plate after cutting to fall off.

4. The method for detecting internal stress in hot-rolled ball mill steel balls according to claim 2, characterized in that: The flip positioning plate is provided with a limiting groove, and the air hole connected to the air chamber is located in the limiting groove; the blocking plate is provided with a positioning groove corresponding to the limiting groove. When the flip positioning plate and the blocking plate clamp the steel ball, the left and right ends of the steel ball are respectively embedded in the limiting groove and the positioning groove.

5. The method for detecting internal stress in hot-rolled ball mill steel balls according to claim 1, characterized in that: A flap is hinged to the bottom detection port of the guide channel. A connecting rod on the side wall of the flap passes through the arc-shaped sliding groove on the side wall of the guide channel and extends out. The connecting rod extends to one end of the guide channel and rests on an eccentric wheel driven by a power mechanism. The eccentric wheel enables the flap to be flipped periodically, thereby enabling the periodic opening and closing of the detection port.

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