Full-automatic production system for isostatic pressing graphite small cylindrical carbon rod and control method

Abstract

The invention belongs to the field of carbon material product production equipment, and particularly relates to an isostatic pressing graphite small cylindrical carbon rod full-automatic production system which comprises an automatic weighing and feeding system which comprises a negative pressure temporary storage bin, a feeding machine, a rotary vibration screen, a measuring bin and an elephant trunk which are sequentially arranged from top to bottom, and the elephant trunk is fixed to a feeding trolley; the automatic forging and taking system comprises a die-casting die, a die-casting head, an ejection mechanism, a positioning sensor and a mechanical arm. During die-casting, the positioning sensor determines that the die-casting head corresponds to the feeding port of the die-casting die, after the die-casting head is started to conduct die-casting forming on carbon powder, the formed carbon rod is ejected out through the ejection mechanism, a material taking signal is sent to the mechanical arm, and the mechanical arm clamps the carbon rod through the clamp arranged at the end and transfers the carbon rod to the stacking position. The invention further provides a control method, the production system and the control method are easy to operate, safe and reliable, and obtained products are high in quality and precision.

Description

Technical Field

[0001] The invention belongs to the field of carbon material product production equipment, and in particular relates to a fully automatic production system and a control method for isostatically pressed graphite small cylindrical carbon rods. Background Art

[0002] Graphite can be used as an anti-wear agent and lubricant. High-purity graphite is used as a neutron moderator in atomic reactors. It can also be used to make crucibles, electrodes, brushes, dry batteries, graphite fibers, heat exchangers, coolers, arc furnaces, arc lamps, pencil refills, etc. In the prior art, when processing graphite raw materials, a screw feeder is often used to transport the materials to the mold and maintain and press the molded electrode plates. Since the graphite raw materials are in powder form, when the graphite raw materials are transported to the upper end and fall from the lower barrel, a lot of dust will be generated. This dust is easy to fly in the air and easily cause pollution, endangering the health of employees; it also causes a lot of raw material waste and increases production input costs.

[0003] CN114349510A discloses a production process of isostatic special graphite, wherein isostatic pressing is performed as follows: the screened material is loaded into a rubber mold sleeve, and after vibration and vacuuming, it is hoisted into an isostatic press; the pressure parameters of the isostatic press are set as follows: maximum pressure 60-200MPa, maximum pressure holding time 10-120 minutes, and pressure relief time 1-20 minutes. The above isostatic pressing process only discloses parameters such as die casting pressure and time, and does not provide loading and unloading processes. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies and defects mentioned in the above background technology and provide a fully automatic production system and control method for isostatic graphite small cylindrical carbon rods that is simple to operate, safe and reliable.

[0005] In order to solve the above technical problems, the technical solution proposed by the present invention is: a fully automatic production system for isostatically pressed graphite small cylindrical carbon rods, comprising: The automatic weighing and feeding system includes: a negative pressure buffer bin, a feeder, a rotary vibrating screen, a metering bin and a slide pipe which are arranged in sequence from top to bottom, and the slide pipe is fixed on the feeding vehicle; when feeding is required, the controller controls the start-up of the negative pressure buffer bin, the feeder and the rotary vibrating screen, and transports the carbon powder from the negative pressure buffer bin to the metering bin, and stops feeding when the weight of the carbon powder in the metering bin reaches the set value; the feeding vehicle is moved and a fixed amount of carbon powder is transported to the die-casting machine through the slide pipe; The automatic forging and material picking system includes a die-casting mold, a die-casting head, an ejection mechanism, a positioning sensor and a manipulator; during die-casting, the positioning sensor is used to determine whether the die-casting head is aligned with the feed port of the die-casting mold, and after the die-casting head is started to die-cast the carbon powder into shape, the ejection mechanism is used to eject the formed carbon rod, and a material picking signal is sent to the manipulator, which clamps the carbon rod through a clamp set at the end and moves it to the stacking position.

[0006] In one embodiment, the carbon rod has a diameter of 52.5 mm to 150 mm and a height of 250 mm to 365 mm.

[0007] In one embodiment, the clamp comprises a pair of arc-shaped jaws, and the inner surfaces of the arc-shaped jaws are flexible surfaces, and the inner surfaces of the arc-shaped jaws fit against the carbon rod during clamping.

[0008] In one embodiment, a force sensor and a position sensor are provided on the clamp for real-time monitoring and feedback of the position of the jaws and the dynamic parameters of the clamping force. The controller controls the jaws to move to the vicinity of the center of gravity of the carbon rod based on the feedback information from the force sensor and the position sensor, and adjusts the strength of the jaws to clamp the carbon rod without damaging the carbon rod.

[0009] In one embodiment, a carbon powder collecting device is provided around the die-casting mold, and the clamp of the manipulator is connected to the end of the manipulator through a connecting flange, and the flange can rotate freely. After the clamp clamps the carbon rod, it flips the carbon rod and moves it to the stacking position.

[0010] In one embodiment, the chute is fixed at one end of the feeding trolley by welding at an angle of 35°-42°, and the other end of the feeding trolley is connected to a driving device. When feeding is required, the controller sends a signal to the driving device, and the driving device controls the feeding trolley to move to the top of the chute to align with the outlet of the metering bin, and the bottom of the chute to align with the feed port of the die-casting mold, and start the feeding operation.

[0011] Based on the same inventive concept, the present invention also provides a control method for the above-mentioned isostatic graphite small cylindrical carbon rod fully automatic production system, comprising: The feeding car is driven to move. When the top of the chute of the feeding car is aligned with the outlet of the metering bin and the bottom of the chute is aligned with the feed inlet of the die-casting mold, the feeding car stops moving. Open the negative pressure buffer bin, feeder and vibrating screen valves, and start the carbon powder conveying; When the carbon powder amount in the metering bin reaches the preset weight, close the negative pressure buffer bin, feeder and rotary vibrating screen valves; Open the valve of the metering bin and transport the carbon powder to the pressing die through the slide pipe; Obtain the position information of the die-casting head and confirm that the die-casting head is aligned with the feed port of the die-casting mold; According to the set holding pressure and holding time, the die casting head is controlled to perform die casting to form the carbon rod; The die-casting head moves upward, and the ejection mechanism ejects the carbon rod and sends a material-taking signal to the robot; The robot moves to the fixture to clamp the center of gravity of the carbon rod and transfers the carbon rod to the stacking position.

[0012] In one embodiment, the manipulator moves to the position where the fixture clamps the center of gravity of the carbon rod, including: The robot moves to the vicinity of the center of gravity of the carbon rod, clamps the carbon rod and moves it to the stacking position; Turn over the carbon rod and scan the top of the carbon rod to obtain the top image of the carbon rod, and compare the obtained top image of the carbon rod with the standard image to determine whether the carbon rod is damaged. If not, confirm that the fixture clamps the center of gravity of the carbon rod and fix the clamping point of the fixture; If the carbon rod is damaged, adjust the clamping position of the fixture and repeat the above steps until it is determined that the carbon rod is not damaged and then fix the clamping point of the fixture.

[0013] In one embodiment, before opening the valve of the metering bin, the method further includes: a calibration step of an electronic scale: Confirm that the electronic scale is in an empty state; Add the rated weight and compare whether the currently displayed weight is the same as the previous calibration value. If different, modify the calibration value to be consistent with the rated weight. If the same, end the calibration.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: in the fully automatic production system and control method of isostatic graphite small cylindrical carbon rods of the present invention, the fully automatic production system includes: an automatic weighing and feeding system and an automatic forging and material taking system. When material is needed, the controller controls the start-up of the negative pressure buffer bin, the feeder and the rotary vibrating screen, and the carbon powder is transported from the negative pressure buffer bin to the metering bin. When the weight of the carbon powder in the metering bin reaches the set value, the feeding is stopped; the feeding car is moved and a fixed amount of carbon powder is transported to the die-casting machine through the chute; during die-casting, the die-casting head is determined to correspond to the feed port of the die-casting mold through the positioning sensor, and after the die-casting head is started to die-cast the carbon powder into shape, the molded carbon rod is ejected through the ejection mechanism, and a material taking signal is sent to the machine. The robot grips the carbon rod through the clamp set at the end and transfers it to the stacking position. The above-mentioned isostatic graphite small cylindrical carbon rod fully automatic production system is fully automatic throughout the process, avoiding manual processing and material taking. The precise weighing of the metering bin ensures the consistency of the product and improves the accuracy of the product. During die-casting, since the produced carbon rods are small carbon rods with a diameter range of 52.5mm-150mm, the die-casting head has high alignment accuracy requirements during die-casting. The position sensor is used to accurately determine that the die-casting head will not shift its position during die-casting, thereby improving the product molding accuracy. With the above-mentioned system, the entire operation process can be fully automatic, greatly improving production capacity and efficiency.

[0015] Furthermore, when the manipulator takes the material, the residual carbon powder on the formed carbon rod can be removed by clamping the carbon rod with a clamp and then flipping it, and the carbon powder can be recycled by using the carbon powder collection devices around the die-casting mold. More importantly, if the carbon rod is taken in and placed manually, it is easy to bump and scratch the carbon rod, affecting the quality of the carbon rod. Since the cylindrical carbon rod has a small diameter and a long length, the present application is particularly suitable for the production of cylindrical carbon rods with a diameter of 52.5mm-150mm and a height of 250mm-365mm. During the unloading process, by adjusting the position of the clamping carbon rod, the clamping claw is as close to the center of gravity of the carbon rod as possible, so as to achieve stable clamping and transfer and placement for stacking, so as not to scratch and damage the carbon rod, thereby affecting the overall quality and performance of the carbon rod. DETAILED DESCRIPTION

[0016] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively and carefully in combination with the following preferred embodiments, but the protection scope of the present invention is not limited to the following specific embodiments.

[0017] Unless otherwise defined, all professional terms used below have the same meanings as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0018] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0019] An isostatic graphite small cylindrical carbon rod fully automatic production system, including: an automatic weighing and feeding system and an automatic forging and picking system and a controller for controlling the operation of the two. The automatic weighing and feeding system includes: a negative pressure buffer bin, a feeder, a rotary vibrating screen, a metering bin and a chute arranged in sequence from top to bottom, and the chute is fixed on a feeding car; when feeding is required, the controller controls the start of the negative pressure buffer bin, the feeder and the rotary vibrating screen, and transports the carbon powder from the negative pressure buffer bin to the metering bin, and stops feeding when the weight of the carbon powder in the metering bin reaches the set value; the feeding car is moved and a fixed amount of carbon powder is transported to the die casting machine through the chute. The automatic forging and material picking system includes a die-casting mold, a die-casting head, an ejection mechanism, a positioning sensor and a manipulator; during die-casting, the positioning sensor is used to determine the feed port of the die-casting mold corresponding to the die-casting head, and after the die-casting head is started to die-cast the carbon powder into shape, the molded carbon rod is ejected through the ejection mechanism, and a material picking signal is sent to the manipulator, which clamps the carbon rod through a clamp set at the end and moves it to the stacking position.

[0020] The small cylindrical carbon rod in the present application specifically refers to a carbon rod with a diameter less than 100 mm.

[0021] Specifically, in one embodiment, the diameter of the carbon rod is 52.5mm-150mm, and the height is 250mm-365mm. This small cylindrical carbon rod has stricter production equipment and operation requirements than large mass and large size ones. During die casting, the die casting head needs to be accurately aligned with the feed port of the die casting mold, and there cannot be a large angle deviation. In order to ensure the alignment accuracy when the die casting head is pressed down, the position of the die casting head is detected by a position sensor, and the detection result is fed back to the controller. When the controller confirms that the position of the die casting head is in the appropriate position after comparing with the standard data, the die casting operation is performed to ensure the quality of the product.

[0022] Specifically, in one embodiment, the chute is fixed at one end of the feeding trolley by welding, and the inclination angle is 35°-42°. The other end of the feeding trolley is connected to the driving device. When feeding is required, the controller sends a signal to the driving device, and the driving device controls the feeding trolley to move to the top of the chute to align with the outlet of the metering bin, and the bottom of the chute to align with the feed port of the die-casting mold, and start the feeding operation.

[0023] Specifically, in one embodiment, the clamp includes a pair of arc-shaped jaws and the inner surface of the arc-shaped jaws is a flexible surface, and the inner surface of the arc-shaped jaws fits the carbon rod when clamping. The inner surface adopts a flexible surface, and the arc-shaped clamping is used to flexibly clamp the carbon rod to avoid scratching the surface of the carbon rod. At the same time, the arc-shaped jaws are used, and their shape fits the arc surface of the cylindrical carbon rod, which can also prevent scratching the surface of the carbon rod. Furthermore, in order to control the clamping force and angle, a force sensor and a position sensor are provided on the clamp to monitor and feedback the position of the jaws and the dynamic parameters of the clamping force in real time. The controller controls the jaws to move to the vicinity of the center of gravity of the carbon rod according to the feedback information of the force sensor and the position sensor, and adjusts the force of the jaws to clamp the carbon rod without damaging the carbon rod. Before clamping, it is necessary to adjust the clamping position of the clamp multiple times to ensure that the clamping position is located at the center of gravity of the carbon rod and then fix the clamping position of the clamp. Then, in the actual production process, the fixed clamping position is used to achieve lossless transfer of the carbon rod.

[0024] Specifically, in one embodiment, the clamp is connected to the end of the manipulator through a connecting flange, and the flange can rotate freely. After the clamp clamps the carbon rod, it flips the carbon rod and moves it to the stacking position. Since the carbon rod is die-casted by a die-casting head during the molding process, some carbon powder will remain on the surface of the molded carbon rod. After the clamp is clamped, the clamp is controlled to flip, the carbon powder on the surface of the carbon rod can be removed, and the carbon powder can be recycled by a recycling device for recycling, saving raw materials and improving the quality of the product.

[0025] A control method for a fully automatic production system of isostatic graphite small cylindrical carbon rods, comprising: S10, driving the feeding car to move, when the top of the chute of the feeding car is aligned with the outlet of the metering bin, and the bottom of the chute is aligned with the feed inlet of the die-casting mold, the feeding car stops moving; S20, opening the negative pressure buffer bin, feeder and rotary vibrating screen valves, and starting the carbon powder conveying; S30, when the amount of carbon powder in the metering bin reaches a preset weight, the negative pressure buffer bin, the feeder and the rotary vibrating screen valve are closed; Specifically, before weighing in the metering bin, the following steps are also included: electronic scale calibration steps: Confirm that the electronic scale is in an empty state; Add the rated weight and compare whether the currently displayed weight is the same as the previous calibration value. If different, modify the calibration value to be consistent with the rated weight. If the same, end the calibration.

[0026] The calibration step can ensure the mass accuracy of the carbon powder weighed in the metering bin, thereby ensuring the quality of the obtained product.

[0027] S40, opening the valve of the metering bin, and conveying the carbon powder to the pressing mold through the slide pipe; S50, obtaining the position information of the die-casting head, and confirming that the die-casting head is aligned with the feed port of the die-casting mold; S60, controlling the die-casting head to perform die-casting until the carbon rod is formed according to the set holding pressure and holding time; S70, the die-casting head moves upward, the ejection mechanism ejects the carbon rod and sends a material taking signal to the manipulator; S80, the robot moves to the clamp to clamp the center of gravity of the carbon rod and transfers the carbon rod to the stacking position.

[0028] Specifically, the manipulator moves to the position where the fixture clamps the center of gravity of the carbon rod, including: The robot moves to the vicinity of the center of gravity of the carbon rod, clamps the carbon rod and moves it to the stacking position; Turn over the carbon rod and scan the top of the carbon rod to obtain the top image of the carbon rod, and compare the obtained top image of the carbon rod with the standard image to determine whether the carbon rod is damaged. If not, confirm that the fixture clamps the center of gravity of the carbon rod and fix the clamping point of the fixture; If the carbon rod is damaged, adjust the clamping position of the fixture and repeat the above steps until it is determined that the carbon rod is not damaged and then fix the clamping point of the fixture.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows: in the fully automatic production system and control method of isostatic graphite small cylindrical carbon rods of the present invention, the fully automatic production system includes: an automatic weighing and feeding system and an automatic forging and material taking system. When material is needed, the controller controls the start-up of the negative pressure buffer bin, the feeder and the rotary vibrating screen, and the carbon powder is transported from the negative pressure buffer bin to the metering bin. When the weight of the carbon powder in the metering bin reaches the set value, the feeding is stopped; the feeding car is moved and a fixed amount of carbon powder is transported to the die-casting machine through the chute; during die-casting, the die-casting head is determined to correspond to the feed port of the die-casting mold through the positioning sensor, and after the die-casting head is started to die-cast the carbon powder into shape, the molded carbon rod is ejected through the ejection mechanism, and a material taking signal is sent to the machine. The robot grips the carbon rod through the clamp set at the end and transfers it to the stacking position. The above-mentioned isostatic graphite small cylindrical carbon rod fully automatic production system is fully automatic throughout the process, avoiding manual processing and material taking. The precise weighing of the metering bin ensures the consistency of the product and improves the accuracy of the product. During die-casting, since the produced carbon rods are small carbon rods with a diameter range of 52.5mm-150mm, the die-casting head has high alignment accuracy requirements during die-casting. The position sensor is used to accurately determine that the die-casting head will not shift its position during die-casting, thereby improving the product molding accuracy. With the above-mentioned system, the entire operation process can be fully automatic, greatly improving production capacity and efficiency.

[0030] Furthermore, when the manipulator takes the material, the residual carbon powder on the formed carbon rod can be removed by clamping the carbon rod with a clamp and then flipping it, and the carbon powder can be recycled by using the carbon powder collection devices around the die-casting mold. More importantly, if the carbon rod is taken in and placed manually, it is easy to bump and scratch the carbon rod, affecting the quality of the carbon rod. Since the cylindrical carbon rod has a small diameter and a long length, the present application is particularly suitable for the production of cylindrical carbon rods with a diameter of 52.5mm-150mm and a height of 250mm-365mm. During the unloading process, by adjusting the position of the clamping carbon rod, the clamping claw is as close to the center of gravity of the carbon rod as possible, so as to achieve stable clamping and transfer and placement for stacking, so as not to scratch and damage the carbon rod, thereby affecting the overall quality and performance of the carbon rod.

Claims

1. A fully automatic production system for isostatic graphite small cylindrical carbon rods, characterized in that: include: The automatic weighing and feeding system includes: a negative pressure buffer bin, a feeder, a rotary vibrating screen, a metering bin and a slide pipe which are arranged in sequence from top to bottom, and the slide pipe is fixed on the feeding vehicle; when feeding is required, the controller controls the start-up of the negative pressure buffer bin, the feeder and the rotary vibrating screen, and transports the carbon powder from the negative pressure buffer bin to the metering bin, and stops feeding when the weight of the carbon powder in the metering bin reaches the set value; the feeding vehicle is moved and a fixed amount of carbon powder is transported to the die-casting machine through the slide pipe; The automatic forging and material picking system includes a die-casting mold, a die-casting head, an ejection mechanism, a positioning sensor and a manipulator; during die-casting, the positioning sensor is used to determine whether the die-casting head is aligned with the feed port of the die-casting mold, and after the die-casting head is started to die-cast the carbon powder into shape, the ejection mechanism is used to eject the formed carbon rod, and a material picking signal is sent to the manipulator, which clamps the carbon rod through a clamp set at the end and moves it to the stacking position.

2. The fully automatic production system of isostatic graphite small cylindrical carbon rods according to claim 1, characterized in that: The carbon rod has a diameter of 52.5 mm to 150 mm and a height of 250 mm to 365 mm.

3. The fully automatic production system of isostatic graphite small cylindrical carbon rods according to claim 1, characterized in that: The clamp comprises a pair of arc-shaped clamping jaws, and the inner surfaces of the arc-shaped clamping jaws are flexible surfaces. When clamping, the inner surfaces of the arc-shaped clamping jaws are in contact with the carbon rod.

4. The fully automatic production system of isostatic graphite small cylindrical carbon rods according to claim 1, characterized in that: The clamp is equipped with a force sensor and a position sensor for real-time monitoring and feedback of the position and dynamic parameters of the clamping force of the clamp. The controller controls the clamp to move to the vicinity of the center of gravity of the carbon rod based on the feedback information from the force sensor and the position sensor, and adjusts the strength of the clamp to clamp the carbon rod without damaging it.

5. The fully automatic production system of isostatic graphite small cylindrical carbon rods according to claim 1, characterized in that: Carbon powder collecting devices are arranged around the die-casting mold. The clamp of the manipulator is connected to the end of the manipulator through a connecting flange, and the flange can rotate freely. After clamping the carbon rod, the clamp is flipped and moved to the stacking position.

6. The fully automatic production system for isostatic graphite small cylindrical carbon rods according to any one of claims 1, characterized in that: The chute is fixed at one end of the feeding trolley by welding, with an angle of 35°-42°. The other end of the feeding trolley is connected to the driving device. When feeding is required, the controller sends a signal to the driving device, and the driving device controls the feeding trolley to move to the top of the chute to align with the outlet of the metering bin, and the bottom of the chute to align with the feed port of the die-casting mold, and start the feeding operation.

7. A control method for the fully automatic production system of isostatic graphite small cylindrical carbon rods according to any one of claims 1 to 6, characterized in that: include: The feeding car is driven to move. When the top of the chute of the feeding car is aligned with the outlet of the metering bin and the bottom of the chute is aligned with the feed inlet of the die-casting mold, the feeding car stops moving. Open the negative pressure buffer bin, feeder and vibrating screen valves, and start the carbon powder conveying; When the carbon powder amount in the metering bin reaches the preset weight, close the negative pressure buffer bin, feeder and rotary vibrating screen valves; Open the valve of the metering bin and transport the carbon powder to the pressing die through the slide pipe; Obtain the position information of the die-casting head and confirm that the die-casting head is aligned with the feed port of the die-casting mold; According to the set holding pressure and holding time, the die casting head is controlled to perform die casting to form the carbon rod; The die-casting head moves upward, and the ejection mechanism ejects the carbon rod and sends a material-taking signal to the robot; The robot moves to the fixture to clamp the center of gravity of the carbon rod and transfers the carbon rod to the stacking position.

8. The control method according to claim 7, characterized in that: The manipulator moves to the fixture to clamp the center of gravity of the carbon rod, including: The robot moves to the vicinity of the center of gravity of the carbon rod, clamps the carbon rod and moves it to the stacking position; Turn over the carbon rod and scan the top of the carbon rod to obtain the top image of the carbon rod, and compare the obtained top image of the carbon rod with the standard image to determine whether the carbon rod is damaged. If not, confirm that the fixture clamps the center of gravity of the carbon rod and fix the clamping point of the fixture; If the carbon rod is damaged, adjust the clamping position of the fixture and repeat the above steps until it is determined that the carbon rod is not damaged and then fix the clamping point of the fixture.

9. The control method according to claim 7, characterized in that: Before opening the valve of the metering bin, the following steps are also included: electronic scale calibration steps: Confirm that the electronic scale is in an empty state; Add the rated weight and compare whether the currently displayed weight is the same as the previous calibration value. If different, modify the calibration value to be consistent with the rated weight. If the same, end the calibration.