Hand-held pneumatic grinding device for spot-welding electrode cap

Abstract

The invention discloses a spot welding electrode cap handheld pneumatic coping device which comprises a positioning feeding mechanism, a driving transmission mechanism and a coping cutter mechanism, the positioning feeding mechanism is installed on the driving transmission mechanism and used for conducting radial positioning on an electrode cap, and positioning clamping and cutting feeding of the electrode cap are achieved; the driving transmission mechanism is connected with the cutter grinding mechanism and drives the cutter grinding mechanism to rotate, and the cutter grinding mechanism is used for grinding the electrode cap. The device has the advantages of being high in coping precision, reliable in structure, easy to operate and capable of achieving continuous operation, and the problem that an existing device cannot meet the large-batch and fast-paced vehicle body welding requirement is solved.

Description

Technical Field

[0001] The invention relates to the technical field of resistance spot welding equipment, in particular to a handheld pneumatic grinding device for a spot welding electrode cap. Background Art

[0002] Resistance spot welding is a welding method that uses a large current to pass through the contact surface and adjacent areas of the workpiece while applying electrode pressure to the workpiece to be welded, so that the parent material quickly generates heat and forms a molten core. In today's automobile manufacturing industry, the resistance spot welding process can complete about 90% of the body parts connection work of the automobile body. Generally, there are about 4000-6000 spot welding points on the steel body, and about 3000-4000 steel welding points and 1000-2000 aluminum welding points on the steel-aluminum hybrid body. Therefore, improving the spot welding quality is of great significance to the production and manufacturing of the car body.

[0003] Although manually operated hanging spot welding guns are gradually being replaced by robot automation equipment, they still play a large role due to cost reasons and the particularity of certain production conditions. In actual production, the working environment of the electrode cap is relatively harsh. Under the combined action of high temperature and high pressure, the electrode cap is prone to deformation, ablation, oxidation and adhesion, which seriously affects the quality and stability of the body welds. Therefore, it is necessary to grind the electrode cap after a certain number of welds to maintain the surface quality of the electrode cap. There are two main ways to grind the electrode cap: manual file grinding and using a bench drill to install the grinding tool and fix the base. Manual grinding is highly dependent on the workers' work experience. After grinding, there are usually various problems with the electrode, such as upper and lower eccentricity of the electrode, tilt and offset of the contact surface, etc., which makes it difficult to meet the standardized process requirements; and using a bench drill for fixed-point grinding, due to the immovable lack of flexibility and portability of the equipment, the electrode cap to be ground cannot be processed in time, which wastes time and manpower and affects the production rhythm.

[0004] A patent document with publication number CN109454319A and publication date March 12, 2019 discloses a single-sided handheld self-loading electrode grinding device, including: an electrode cap positioning and clamping mechanism for positioning and clamping the spot welding electrode, a drive transmission mechanism, and a grinding tool mechanism. However, the device structure uses the lower end face of the electrode cap for positioning rather than radial positioning, and the limit reliability is weak, and it cannot ensure that the radial position of the electrode working surface after grinding is consistent with the original working surface.

[0005] The patent document with the announcement number CN220944647U and the announcement date of May 14, 2024 discloses a rechargeable lithium battery electrode cap electric grinder, including a grinder assembly power supply and a handle at the front end of the grinder assembly power supply; a fixed connector is provided at the front end of the connector, and a grinding assembly and a grinding hole are provided at the lower end of the fixed connector. The electrode cap can be ground at the fixed and accurate grinding hole position. However, the device uses lithium batteries for power supply and cannot guarantee long-term continuous operation, and has the disadvantage of being unable to accurately locate the electrode. Summary of the invention

[0006] The purpose of the present invention is to provide a handheld pneumatic grinding device for spot welding electrode caps, which has the advantages of grinding accuracy, reliable structure, simple operation and sustainable operation, and meets the needs of large-scale fast-paced body welding.

[0007] The present invention is achieved through the following technical solutions:

[0008] A handheld pneumatic grinding device for a spot welding electrode cap comprises a positioning and feeding mechanism, a driving transmission mechanism and a grinding tool mechanism. The positioning and feeding mechanism is installed on the driving transmission mechanism to radially position the electrode cap to achieve positioning, clamping and cutting feeding of the electrode cap. The driving transmission mechanism is connected to the grinding tool mechanism to drive the grinding tool mechanism to rotate. The grinding tool mechanism is used to grind the electrode cap.

[0009] Preferably, the positioning and feeding mechanism includes a movable handle, a connecting rod top rod, a fixed connecting plate and a limit baffle. The movable handle is rotatably connected to both sides of the driving transmission mechanism, the connecting rod end of the connecting rod top rod is slidably connected to the movable handle, and the top rod end of the connecting rod top rod passes through the through holes on the fixed connecting plate and the limit baffle in turn, and extends to the outside of the limit baffle for installing the electrode cap.

[0010] Preferably, the movable handle is in a Y-shaped structure, and both side ends thereof are connected to the driving transmission mechanism via a connecting shaft to form a rotating pair.

[0011] Preferably, notches are provided on both sides of the movable handle, and the connecting rod top rod is in a T-shaped structure, and the connecting rod ends are respectively embedded in the notches on both sides of the movable handle to form a movable joint.

[0012] Preferably, the drive transmission mechanism includes a power output mechanism and a gear reduction box, one end of the gear reduction box is connected to the power output mechanism, and the other end is connected to the tool grinding mechanism, and the fixed connecting plate is fixed between the power output mechanism and the gear reduction box.

[0013] Preferably, the gear reduction structure in the gear reduction box is a planetary gear train reduction structure.

[0014] Preferably, the power output mechanism is a pneumatic motor, and the pneumatic motor is connected to an external air source air pipe joint through a quick connector at the rear.

[0015] Preferably, the limit baffle is in an L-shaped structure.

[0016] Preferably, the diameter of the top rod end of the connecting rod top rod is 12.6 mm, and the diameter of the through holes on the fixed connecting plate and the limit baffle is 12.6 mm.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention realizes the positioning, clamping and cutting feeding of the electrode cap through the cooperation of the connecting rod push rod and the limit baffle in the positioning and feeding mechanism, accurately positions the electrode, ensures that the radial position of the electrode working surface after grinding is consistent with the original working surface, and has a simple and reliable structure and convenient operation. The grinding device has a compact structure, light weight and long service life, and meets the needs of operations in narrow spaces. It not only has high flexibility and can be circulated in various welding stations to meet the grinding needs, but also the integrated operations of positioning, clamping, feeding and grinding the electrode cap can also perform long-term centralized grinding of batches of electrode caps to be ground. The present invention meets the needs of large-scale and fast-paced body welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The disclosure of the present invention is described with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the accompanying drawings, the same reference numerals are used to refer to the same components. Among them:

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the initial grinding position of the present invention.

[0022] Figure 3 It is a schematic diagram of the grinding working position of the present invention.

[0023] In the figure: 1 power output mechanism, 2 movable handle, 3 connecting rod top rod, 4 fixed connecting plate, 5 limit baffle, 6 gear reduction box, 7 grinding assembly, 8 grinding tool, 9 connecting shaft, 10 electrode cap. DETAILED DESCRIPTION

[0024] like Figure 1 As shown, a handheld pneumatic grinding device for a spot welding electrode cap of the present embodiment comprises: a positioning and feeding mechanism, a driving and transmission mechanism and a grinding tool mechanism, wherein: the positioning and feeding mechanism realizes the positioning, clamping and cutting feeding of the electrode cap 10, the driving and transmission mechanism is respectively connected to the grinding tool mechanism and the positioning and feeding mechanism, thereby providing a rotational torque for circumferential grinding to the grinding tool mechanism, and the driving and transmission mechanism and the grinding tool mechanism are located below the positioning and feeding mechanism.

[0025] like Figure 1 As shown, the positioning feeding mechanism in this example includes: a movable handle 2, a connecting rod top rod 3, a fixed connecting plate 4, a limit baffle 5, and a connecting shaft 9. Among them: the limit baffle 5 is coaxially installed on the front side of the fixed connecting plate 4, the connecting rod ends of the connecting rod top rod 3 are respectively embedded in the notches on both sides of the movable handle 2, and the top rod end penetrates from the rear side of the fixed connecting plate 4.

[0026] The movable handle 2 is in a Y-shaped structure, with through holes of the same size opened on both sides of the front end, and is connected to the power output mechanism 1 through a connecting shaft 9 to form a rotating pair, and notches of the same size are opened on both sides of the movable handle 2.

[0027] The fixed connecting plate 4 is provided with a through hole having the same diameter as the top rod end of the connecting rod top rod 3 and is installed between the power output mechanism 1 and the gear reduction box 6 .

[0028] The limit baffle 5 is in an L-shaped structure. A through hole having the same diameter as the top rod end of the connecting rod top rod 3 is formed in the limit baffle 5 , and the limit baffle 5 is coaxially mounted on the fixed connecting plate 4 .

[0029] The connecting rod push rod is in a T-shaped structure, and the connecting rod ends are respectively embedded in the grooves on both sides of the movable handle to form a moving pair. The push rod end has a diameter of 12.6mm and penetrates the fixed connecting plate and the limit baffle from the rear side of the fixed connecting plate to form a moving pair.

[0030] The opening diameter of the fixed connecting plate 4 is 12.6 mm.

[0031] The opening diameter of the limit baffle 5 is 12.6 mm.

[0032] The drive transmission mechanism comprises: a power output mechanism 1 and a gear reduction box 6 connected to each other, wherein: the gear reduction box 6 amplifies the torque provided by the power output mechanism 1 .

[0033] Preferably, considering that the grinding device is lightweight and reliable and the power source is easy to collect, the power output mechanism 1 is a pneumatic motor, and the pneumatic motor is connected to an external air source through a quick connector at the rear.

[0034] The gear reduction box 6 amplifies the torque of the power output mechanism 1 by changing the gear ratio through the internal planetary gear system reduction structure, and is connected to the grinding component 7.

[0035] The front end surface of the gear reduction box 6 is provided with a groove matched with the grinding assembly 7 for fixing the relative position, driving the grinding assembly 7 and the grinding tool 8 to rotate.

[0036] The power output mechanism 1 is connected to an external air source, does not need to be connected to electricity, and is safe and convenient to operate. The air pressure is usually set at 5-7 kg / cm 2Between, select the pipe diameter interface PT-1 / 4.

[0037] The pneumatic motor has a rated power of 400W, and the rated speed is adjusted to 700rpm through the gear reducer 6, and the full-load output torque is 19N / m.

[0038] The tool grinding mechanism comprises: a grinding assembly 7 and a grinding tool 8 that cooperate with each other, wherein: the grinding tool 8 is arranged in the grinding assembly 7. The grinding assembly 7 is an existing structure and will not be described here.

[0039] The inner surface of the grinding tool 8 matches the outer surface of the electrode cap 10 .

[0040] The grinding tool is directly opposite to the electrode cap positioning hole formed by the limiting baffle 5 and the connecting rod push rod 3.

[0041] The grinding tool 8 is a 16 mm full-cambered electrode cap grinding blade.

[0042] The working process of this device is as follows: the initial position of the device is as follows: Figure 2 As shown, firstly, the electrode cap 10 to be ground is taken out from the manual welding gun head or from the consumables library. The inner diameter of the electrode cap 10 is 12.6 mm and the inclination is 1 / 10 from the port to the inside. The electrode cap 10 is placed on the connecting rod top rod 3 through the groove positioning of the limit baffle 5; the compressed air source is connected, and the power output mechanism 1 is started to drive the grinding tool mechanism to rotate and provide the grinding torque; the grinding working position of the device is as shown in Figure 3 As shown, the handle of the movable handle 2 is pulled, and the movable handle 2 drives the connecting rod top rod 3 to feed the initially positioned and installed electrode cap 10 in the direction of the grinding tool 8 through the fixed connecting plate 4 and the limit baffle 5; the movable handle 2 is continuously applied with force, and the electrode cap 10 is further clamped and fixed and provides grinding force under the action of the pressure of the connecting rod top rod 3 and the grinding tool 8; after the grinding is completed, the power output mechanism 1 is closed to stop the rotation of the grinding tool 8, and at the same time, the movable handle 2 is operated to make the connecting rod top rod 3 drive the electrode cap 10 to retreat to the limit baffle 5, and the movable handle 2 is retreated to the initial grinding position of the device by inertia. Figure 2 As shown, the clamping force generated by the connecting rod push rod 3 and the electrode cap 10 during grinding is automatically released, and the electrode cap 10 in the limit baffle 5 is taken out and installed back on the manual welding gun to complete the grinding.

[0043] The above-mentioned specific implementation can be partially adjusted in different ways by those skilled in the art without departing from the principle and purpose of the present invention. The protection scope of the present invention shall be based on the claims and shall not be limited by the above-mentioned specific implementation. Each implementation scheme within its scope shall be subject to the constraints of the present invention.

Claims

1. A handheld pneumatic grinding device for spot welding electrode caps, comprising a positioning and feeding mechanism, a driving transmission mechanism and a grinding tool mechanism, characterized in that: The positioning and feeding mechanism is installed on the driving transmission mechanism to radially position the electrode cap to achieve positioning, clamping and cutting feeding of the electrode cap. The driving transmission mechanism is connected to the grinding tool mechanism to drive the grinding tool mechanism to rotate. The grinding tool mechanism is used to grind the electrode cap.

2. A handheld pneumatic grinding device for spot welding electrode caps according to claim 1, characterized in that: The positioning and feeding mechanism includes a movable handle, a connecting rod top rod, a fixed connecting plate and a limit baffle. The movable handle is rotatably connected to both sides of the driving transmission mechanism. The connecting rod end of the connecting rod top rod is slidably connected to the movable handle. The top rod end of the connecting rod top rod passes through the through holes on the fixed connecting plate and the limit baffle in turn, and extends to the outside of the limit baffle for installing the electrode cap.

3. A handheld pneumatic grinding device for spot welding electrode caps according to claim 2, characterized in that: The movable handle is in a Y-shaped structure, and both side ends thereof are connected to the driving transmission mechanism through a connecting shaft to form a rotating pair.

4. A handheld pneumatic grinding device for spot welding electrode caps according to claim 3, characterized in that: Notches are arranged on both sides of the movable handle, and the connecting rod top rod is in a T-shaped structure, and the connecting rod ends are respectively embedded in the notches on both sides of the movable handle to form a moving joint.

5. A handheld pneumatic grinding device for spot welding electrode caps according to claim 2, characterized in that: The drive transmission mechanism includes a power output mechanism and a gear reduction box. One end of the gear reduction box is connected to the power output mechanism, and the other end is connected to the tool grinding mechanism. The fixed connecting plate is fixed between the power output mechanism and the gear reduction box.

6. A handheld pneumatic grinding device for spot welding electrode caps according to claim 5, characterized in that: The gear reduction structure in the gear reduction box is a planetary gear system reduction structure.

7. A handheld pneumatic grinding device for spot welding electrode caps according to claim 5, characterized in that: The power output mechanism is a pneumatic motor, which is connected to an external air source air pipe joint via a quick connector at the rear.

8. A handheld pneumatic grinding device for spot welding electrode caps according to claim 2, characterized in that: The limit baffle is in an L-shaped structure.

9. A handheld pneumatic grinding device for spot welding electrode caps according to claim 1, characterized in that: The diameter of the top rod end of the connecting rod top rod is 12.6 mm, and the diameter of the through holes on the fixed connecting plate and the limit baffle is 12.6 mm.

Images