A handheld weld grinding device capable of protecting welding parent material and a working method thereof

Abstract

The present invention relates to a handheld weld grinding device and a working method capable of protecting a welding parent material, comprising a frame on which a driving mechanism is fixed, the driving mechanism being connected to a cylindrical tool and capable of driving the tool to work, circular positioning pieces having a diameter greater than that of the tool being provided on both sides of the tool, the circular positioning pieces being capable of rolling along the surface of the welding parent material during grinding, and the residual height of the weld being controlled by the diameter difference between the circular positioning piece and the tool, the grinding device of the present invention can effectively protect the welding parent material, and conveniently control the grinding feed speed, has a good grinding effect, and is suitable for different processing scenarios.

Description

Technical Field

[0001] The invention relates to the technical field of weld grinding equipment, and in particular to a handheld weld grinding device capable of protecting a welding parent material and a working method. Background Art

[0002] Plate welding is currently widely used in various aspects of industrial production. The welded plates include arc-shaped plates and flat plates. Different working conditions have different requirements for the surface after welding. Some occasions have higher requirements for the surface after welding, have requirements for weld height, and need to grind the weld. Some occasions require the recycling of debris generated during the weld grinding process.

[0003] A common method of weld removal is to grind the weld with an angle grinder. A few companies also use a robotic arm to remove the weld by clamping a constant force gauge. Manually grinding the weld with an angle grinder is time-consuming and labor-intensive. Since the grinding force and angle of a handheld angle grinder are difficult to control, the surface of the parent material may be scratched if not carefully, causing the product to be scrapped. The dust generated after grinding with an angle grinder is inconvenient to recycle, and it also has an adverse effect on the processed surface. Although grinding with a constant force gauge can keep the grinding force constant, the constant force gauge is expensive and has a high cost. The currently widely used weld removal method cannot meet the processing requirements of automatic feeding, high efficiency, safety, and economy.

[0004] There are weld grinders on the market. They are pneumatic grinding devices with metal plate positioning mechanisms. This product is difficult to apply to situations where the welding base material is a softer material such as aluminum alloy, and it is easy to damage the base material. It is also difficult to apply to cabins welded from arc plates. This product lacks the necessary chip recovery device and is difficult to maintain the processing surface environment. This product is pneumatically driven, noisy, and has many auxiliary equipment, which is inconvenient to use. It lacks the necessary feed speed guidance device, making it difficult to grasp the optimal feed speed, which has a greater impact on the quality of the processed surface. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a handheld weld grinding device that can protect the welding base material, solve the problems of low processing efficiency, easy scratching of the base material, and difficulty in recycling debris in traditional grinding methods, and greatly improve the processing efficiency and processing effect of weld grinding.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A handheld weld grinding device capable of protecting a welding base material comprises a frame on which a driving mechanism is fixed, the driving mechanism being connected to a cylindrical tool and capable of driving the tool to work, circular positioning members having a diameter greater than that of the tool being provided on both sides of the tool, the circular positioning members being capable of rolling along the surface of the welding base material during grinding, and the residual height of the weld being controlled by the diameter difference between the circular positioning member and the tool.

[0008] Furthermore, the driving mechanism includes a DC reduction motor fixed on a frame, the DC reduction motor is equipped with a first encoder, the first encoder is used to monitor the output shaft speed of the DC reduction motor, the output shaft of the DC reduction motor is connected to an acceleration transmission box, and the output shaft of the acceleration transmission box is connected to a tool.

[0009] Furthermore, the DC reduction motor is connected to a stepless motor speed regulator, which is fixed on a frame and is used to perform stepless speed regulation and forward and reverse rotation adjustment on the DC reduction motor.

[0010] Furthermore, the tool adopts a cylindrical milling cutter, which is fixed on the tool fixing shaft. Both ends of the tool fixing shaft are rotatably connected to the tool shaft fixing plate. One end of the tool fixing shaft passes through the tool shaft fixing plate and is connected to the output shaft of the acceleration transmission box. The circular positioning part adopts a plastic-coated bearing, which is fixed on the tool fixing shaft sections on both sides of the tool. A second encoder is installed on the tool fixing shaft to monitor the rotational speed of the tool fixing shaft.

[0011] Furthermore, a chip splash shield is provided above the cylindrical milling cutter, and the chip splash shield is fixed on the tool shaft fixing plate to prevent the chip splash generated during the machining process.

[0012] Furthermore, a camera device is provided inside the waste chip splash shield, and the camera device is fixed on the frame.

[0013] Furthermore, an auxiliary support frame is fixed on one of the side panels of the frame, an auxiliary support shaft is rotatably connected to the auxiliary support frame, rubber-coated bearing auxiliary wheels are fixed at both ends of the auxiliary support shaft, a third encoder is installed on the auxiliary support shaft, the rubber-coated bearing auxiliary wheels can roll along the welding base material during weld grinding, and the third encoder is used to monitor the grinding feed speed.

[0014] Furthermore, a switching power supply is fixed on the frame, a handle is fixed on the top of the frame, and a comparison guidance prompter is provided on one side of the handle.

[0015] Furthermore, the comparison guidance prompter, the first encoder, the second encoder and the third encoder are all connected to a controller, and the controller can receive information collected by the first encoder, the second encoder and the third encoder, and display it on the comparison guidance prompter.

[0016] The present invention also discloses a working method of a handheld weld grinding device capable of protecting a welding base material, comprising the following steps:

[0017] Step 1: Calculate the reasonable grinding feed speed based on the tool speed and the reasonable feed per tooth of the welding base material;

[0018] Step 2: Start the driving mechanism, which drives the tool to rotate, so that the positioning element contacts the welding parent material on both sides of the weld. The tool contacts the weld, and pushes the positioning elements on both sides of the tool to roll forward along the welding parent material. The tool grinds the weld. While the tool and the positioning element move forward, observe the actual feed speed displayed on the comparison indicator in real time, and control the actual feed speed to be less than the reasonable grinding feed speed calculated in step 1.

[0019] Beneficial effects of the present invention:

[0020] 1. The weld grinding device of the present invention adopts a cylindrical milling cutter as a tool, which has good cutting effect, good processing surface quality, high tool hardness, slow wear, and is easy to realize automatic feeding.

[0021] 2. The weld grinding device of the present invention uses a plastic-coated bearing to position the tool, and controls the cutting allowance of the milling cutter by the diameter difference between the plastic-coated bearing and the tool, thereby controlling the weld residual height after cutting. There is rolling friction between the plastic-coated bearing and the welding parent material, and the friction force is small, which avoids damage to the welding parent material and makes the processing process smoother. In addition, the plastic-coated bearing is used for positioning, which can achieve positioning of the cylindrical outer wall, making the grinding device more applicable. The tool and the plastic-coated bearing are easy to replace. By replacing different tools and plastic-coated bearings, the purpose of controlling different cutting allowances can be achieved to adapt to different processing scenarios.

[0022] 3. The weld grinding device of the present invention has an auxiliary support frame and a rubber-coated bearing auxiliary wheel to assist in positioning the grinding device. It has a third encoder that can detect the feed speed and display it on the feed speed comparison indicator, which is convenient for the operator to reasonably control the feed speed and achieve the best grinding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation on the present application.

[0024] Figure 1It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a schematic diagram of assembling the cylindrical milling cutter and the plastic-coated bearing of the present invention;

[0026] Figure 3 This is a schematic diagram of the assembly of the acceleration transmission box and the tool fixing shaft of the present invention;

[0027] Among them, 1. Side plate, 2. First support plate, 3. Second support plate, 4. Third support plate, 5. DC reduction motor, 6. Motor seat, 7. Acceleration transmission box, 8. Stepless motor speed regulator, 9. Cylindrical milling cutter, 10. Tool fixing shaft, 11. Tool shaft fixing plate, 12. Connecting plate, 13. Double diaphragm coupling, 14. Plastic-coated bearing, 15. Shaft retaining ring, 16. Waste chip splash guard, 17. Miniature camera, 18. Auxiliary support frame, 19. Rubber-coated bearing auxiliary wheel, 20. Third encoder, 21. Switching power supply, 22. Handle, 23. Comparison guidance reminder. DETAILED DESCRIPTION

[0028] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0030] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0031] As introduced in the background technology, the existing weld grinding device is easy to cause damage to the welding base material. In view of the above problem, the present application proposes a handheld weld grinding device that can protect the welding base material.

[0032] In a typical implementation of the present application, Figure 1-3As shown, a handheld weld grinding device capable of protecting a welding base material comprises a frame, wherein the frame comprises two parallel side panels 1, a first support plate 2, a second support plate 3 and a third support plate 4 are fixed between the two side panels, the first support plate is fixed to the top ends of the side panels on both sides, the second support plate is fixed to the middle parts of the two side panels, and the third support plate is fixed to the bottom ends of the two side panels.

[0033] A driving mechanism is fixed on the frame, and the driving mechanism includes a 24V, 200W DC reduction motor 5, which is fixed to the lower surface of the second support plate through a motor seat 6, and the output shaft of the DC reduction motor is connected to an acceleration transmission box 7, and the output shaft of the DC reduction motor serves as an input shaft of the acceleration transmission box. The acceleration transmission box is fixed on the motor seat, and uses spur gears for transmission, with a transmission ratio of 1:2. It is lubricated with fixed grease, and sealed with deep groove ball bearings and O-rings. The power of the DC reduction motor is transmitted after being accelerated by the acceleration transmission box, and a first encoder is installed on the output shaft of the DC reduction motor, and the first encoder can measure the rotation speed of the output shaft of the DC reduction motor.

[0034] The DC reduction motor is also connected to a stepless motor speed regulator 8, which is fixed on the upper surface of the second support plate and is used for stepless speed regulation and forward and reverse rotation control of the DC reduction motor.

[0035] The output shaft of the acceleration transmission box is connected to the tool to transmit the power of the DC reduction motor to the tool. The tool adopts a cylindrical milling cutter 9 made of cemented carbide. The diameter of the cylindrical milling cutter is 40mm and the width of the tool is 40mm. The cylindrical milling cutter has multiple cutting edges, and the cutting edges are used to remove the weld material. The cylindrical milling cutter is fixedly connected to the tool fixing shaft 10. The two ends of the tool fixing shaft are rotatably connected to the tool shaft fixing plate 11 through bearings. The two tool shaft fixing plates are connected as a whole through a connecting plate 12. One end of the tool shaft passes through the tool shaft fixing plate and is connected to the output shaft of the acceleration transmission box through a double diaphragm coupling 13. The tool shaft fixing plate located on one side of the acceleration transmission box is fixedly connected to the box body of the acceleration transmission box. The use of a double diaphragm coupling can protect the gears in the acceleration transmission box and reduce the damage to the gears caused by impact loads.

[0036] Circular positioning elements are installed on the tool fixing shaft sections on both sides of the cylindrical milling cutter. The positioning elements are plastic-coated bearings 14. The outer diameter of the plastic-coated bearings is larger than the outer diameter of the cylindrical milling cutter. The plastic-coated bearings and the cylindrical milling cutter are positioned and fixed on the tool fixing shaft through shaft retaining springs 15. Since the outer diameter of the plastic-coated bearings is larger than the outer diameter of the cylindrical milling cutter, during grinding, the cylindrical milling cutter has a relatively safe distance from the welding parent material, thereby avoiding damage to the welding parent material by the cylindrical milling cutter.

[0037] A second encoder is also installed on the tool fixing shaft, and the second encoder can monitor the rotation speed of the tool fixing shaft.

[0038] A chip splash shield 16 is also provided above the cylindrical milling cutter. The chip splash shield is set according to the direction in which the chips fly out. The chip splash shield is fixed on the tool shaft fixing plate. The chip splash shield can prevent the splashing of chips during the grinding process and prevent the grinding work from polluting the surrounding environment.

[0039] A camera device is also provided inside the waste splash shield. The camera device uses a miniature camera 17 with an LED light source. The miniature camera is fixed on the bottom end surface of the third support plate, so that the user can observe the welding seam grinding situation in real time.

[0040] An auxiliary support frame 18 is provided at the lower part of the side plate on the right side of the frame, and an auxiliary support shaft is rotatably connected to the auxiliary support frame through a bearing. Rubber-coated bearing auxiliary wheels 19 are fixed at both ends of the auxiliary support shaft. A third encoder 20 is installed on the auxiliary support shaft. The third encoder can monitor the feed speed of grinding. The auxiliary support frame and the rubber-coated bearing auxiliary wheel can provide auxiliary support to the entire grinding device during the moving process to improve the stability of grinding.

[0041] A switching power supply 21 is also fixed on the upper end surface of the second support plate. The switching power supply is located on one side of the stepless motor speed regulator. The switching power supply is used to convert 220V AC power into 24V DC power to power the DC reduction motor and the stepless motor speed regulator.

[0042] A handle 22 is provided at the top of the first support plate to facilitate the operator to push the grinding device forward. A comparison guidance prompter 23 is provided on one side of the handle. The comparison guidance prompter is connected to the controller, and the controller can display the received information on the comparison guidance prompter. The controller adopts an STM32 microcontroller, and the STM32 microcontroller is connected to the first encoder, the second encoder and the third encoder. The information collected by the first encoder, the second encoder and the third encoder can be transmitted to the STM32 microcontroller.

[0043] The present invention also discloses a working method of a handheld weld grinding device capable of protecting a welding base material, comprising the following steps:

[0044] Step 1: Calculate the reasonable grinding feed speed based on the tool speed and the reasonable feed per tooth of the welding base material. Step 1 is a simple theoretical calculation and will not be described in detail here.

[0045] Step 2: Start the DC reduction motor. The DC reduction motor drives the cylindrical milling cutter to rotate through the acceleration transmission box, so that the plastic-coated bearing contacts the welding parent material on both sides of the weld. The cylindrical milling cutter contacts the weld. The operator holds the handle and pushes the entire grinding device forward. The plastic-coated bearing rolls along the welding parent material. At the same time, the cylindrical milling cutter grinds the weld. At the same time, the actual feed speed displayed by the comparison indicator is observed in real time. The operator controls the actual feed speed to be less than the reasonable grinding feed speed calculated in step 1 to always maintain a good grinding effect.

[0046] During the grinding process, the first encoder can collect the rotation speed of the DC reduction motor output shaft, and the second encoder can collect the rotation speed of the tool fixed shaft. By comparing the two collected rotation speeds, it can be determined whether the DC reduction motor output shaft and the tool fixed shaft are working strictly according to the transmission ratio, so as to determine whether the acceleration transmission box is working normally. The third encoder can obtain the actual grinding feed speed based on the monitoring speed of the auxiliary support shaft, and compare it with the calculated reasonable grinding feed speed. When the actual grinding feed speed exceeds the reasonable grinding feed speed, the comparison guidance display can alarm, so that the operator can reduce the actual grinding feed speed to make it lower than the reasonable grinding feed speed, ensuring that the weld cutting effect always remains in the best state.

[0047] During the grinding process of the present invention, the cylindrical milling cutter is at a certain distance from the welding parent material, and the plastic-coated bearing and the welding parent material are in rolling friction, which effectively avoids damage to the welding parent material during the grinding process. The plastic-coated bearing is used for positioning. The plastic-coated bearing has high rigidity and small deformation, which is beneficial to improving the positioning accuracy of the tool. At the same time, when grinding the cylindrical welding parent material, it can still be accurately positioned, and it is more practical.

[0048] The grinding device of the present invention can obtain the feed speed in real time during the grinding process, which is convenient for the operator to control the feed speed and can always maintain a high grinding effect. Moreover, during the grinding process, the flying waste chips enter the waste chip splash shield, thereby avoiding pollution to the surrounding air.

[0049] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A working method of a handheld weld grinding device capable of protecting a welding base material, characterized in that: A handheld weld grinding device capable of protecting a welding base material is used, the device comprising a frame, a driving mechanism fixed on the frame, the driving mechanism connected to a cylindrical tool, capable of driving the tool to work, circular positioning pieces with a diameter greater than the tool diameter are provided on both sides of the tool, the circular positioning pieces can roll along the surface of the welding base material during grinding, and the residual height of the weld is controlled by the diameter difference between the circular positioning piece and the tool; The driving mechanism comprises a DC reduction motor fixed on a frame, the DC reduction motor is equipped with a first encoder, the first encoder is used to monitor the output shaft speed of the DC reduction motor, the output shaft of the DC reduction motor is connected to an acceleration transmission box, and the output shaft of the acceleration transmission box is connected to a tool; The tool adopts a cylindrical milling cutter, which is fixed on a tool fixing shaft, and both ends of the tool fixing shaft are rotatably connected to a tool shaft fixing plate, and one end of the tool fixing shaft passes through the tool shaft fixing plate and is connected to an output shaft of an acceleration transmission box, and the circular positioning member adopts a plastic-coated bearing, which is fixed on the tool fixing shaft sections on both sides of the tool, and a second encoder is installed on the tool fixing shaft for monitoring the rotation speed of the tool fixing shaft; An auxiliary support frame is fixed on one of the side plates of the frame, an auxiliary support shaft is rotatably connected to the auxiliary support frame, rubber-coated bearing auxiliary wheels are fixed at both ends of the auxiliary support shaft, a third encoder is installed on the auxiliary support shaft, the rubber-coated bearing auxiliary wheels can roll along the welding base material during weld grinding, and the third encoder is used to monitor the grinding feed speed; A switch power supply is also fixed on the frame, a handle is fixed on the top of the frame, and a comparison guidance reminder is provided on one side of the handle; The comparison guidance prompter, the first encoder, the second encoder and the third encoder are all connected to the controller, and the controller can receive the information collected by the first encoder, the second encoder and the third encoder, and display it on the comparison guidance prompter; The method comprises the following steps: Step 1: Calculate the reasonable grinding feed speed based on the tool speed and the reasonable feed per tooth of the welding base material; Step 2: Start the driving mechanism, which drives the tool to rotate, so that the circular positioning piece contacts the welding base material on both sides of the weld, and the tool contacts the weld, pushing the circular positioning pieces on both sides of the tool to roll forward along the welding base material, so that the tool grinds the weld. While the tool and the circular positioning piece move forward, observe and compare the actual feed speed displayed on the guidance prompter in real time, and control the actual feed speed to be less than the reasonable grinding feed speed calculated in step 1; During the grinding process, the first encoder can collect the rotation speed of the DC reduction motor output shaft, and the second encoder can collect the rotation speed of the tool fixed shaft. By comparing the two collected rotation speeds, it can be determined whether the DC reduction motor output shaft and the tool fixed shaft are working strictly according to the transmission ratio, thereby determining whether the acceleration transmission box is working normally.

2. The working method of the handheld weld grinding device capable of protecting the welding base material according to claim 1, characterized in that: The DC reduction motor is connected to a stepless motor speed regulator, which is fixed on a frame and is used for stepless speed regulation and forward and reverse rotation adjustment of the DC reduction motor.

3. The working method of the handheld weld grinding device capable of protecting the welding base material according to claim 1, characterized in that: A waste chip splash shield is arranged above the cylindrical milling cutter, and the waste chip splash shield is fixed on the tool shaft fixing plate to prevent waste chips generated during the machining process from splashing.

4. The operating method of the handheld weld grinding device capable of protecting the welding base material as claimed in claim 3, characterized in that: A camera device is arranged inside the waste chip splash shield and is fixed on the frame.

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