Electric resistance welding head

Abstract

A welding head for electric resistance welding is characterized in that the welding head for electric resistance welding comprises a box body, conductive tiles, a conductive shaft and a welding wheel, the conductive tiles, the conductive shaft and the welding wheel are installed on the box body, the conductive tiles are arranged on the rear side of the box body, the conductive tiles comprise the left conductive tile and the right conductive tile, and a round hole for the conductive shaft to be inserted is formed after the two conductive tiles are in butt joint; the conductive shaft is arranged in the circular hole in a penetrating mode and connected with the welding wheel, the conductive shaft is in contact with the conductive tiles through the bearing bush, and a belleville spring which connects the two conductive tiles and exerts pretightening force on the conductive shaft is arranged between the two conductive tiles. The welding head is simple and reasonable in structure, convenient to use, small in abrasion of the conductive tile blocks and stable and reliable in welding performance, the overall conductive performance of the welding head is effectively improved, the service life of the welding head is greatly prolonged, the service life is prolonged to more than 6 years at present from original 2 years, and the welding head can be widely applied to similar welding machines of resistance welding machines and has wide application prospects. And the practical application significance of being popularized to various plate and strip steel production and processing enterprises is completely achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of welding and relates to a resistance welding head. Background Art

[0002] Resistance welding is the most widely used welding method in pressure welding. It uses the resistance heat energy generated by the current passing through the contact surface of the weld joint and the adjacent area to heat the welded metal to a local melt or a high plastic state, and forms a fixed weld joint under the action of external force. When welding with resistance welding, no filler metal is required, the productivity is high, the weld deformation is small, and it is easy to realize automation.

[0003] The Miebach resistance welding machine of the continuous annealing and pickling unit of the stainless steel production enterprise is used to weld plate and strip steel with a thickness of 0.3mm-3.0mm. The main function of the welding head is to lead the welding current from the rectifier to the welding wheel, and then press the stainless steel strip through the upper and lower welding wheels to form a loop. The upper and lower welding wheels rotate and move at the same time to weld the two steel coils together. The welding head originally used a spherical conductive block, which was fixed by 3 butterfly spring fixing bolts. After the conductive block is worn, it is difficult to ensure that the two are in a parallel state. During use, the uneven wear causes the spherical conductive block to have poor contact with the two, which affects the quality of strip welding. In addition, the service life of the welding head is relatively short at present, and it needs to be replaced after about 2 years of use, which greatly increases the production cost.

[0004] Therefore, a new resistance welding head needs to be developed to ensure the normal welding performance of the welding head. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide a resistance welding head with simple and reasonable structure, convenient use and stable and reliable welding performance in view of the above technical status quo.

[0006] The technical solution adopted by the utility model to solve the above-mentioned technical problems is: a resistance welding head, characterized in that: the resistance welding head includes a box body and a conductive tile, a conductive shaft and a welding wheel installed on the box body, the conductive tile is arranged on the rear side of the box body, the conductive tile is divided into two left and right pieces, the two conductive tiles are butt-jointed to form a circular hole for inserting the conductive shaft, the conductive shaft is inserted into the circular hole and connected to the welding wheel, the conductive shaft and the conductive tile are in contact through the bearing, and a butterfly spring is provided between the two conductive tiles to connect the two and apply a pre-tightening force to the conductive shaft.

[0007] As an improvement, the two conductive tiles are axially symmetrically provided with through semicircular holes on one side of the butt joint. After the two conductive tiles are butt jointed, a circular hole with a certain gap is formed. The conductive shaft is cylindrical, and the diameter of the conductive shaft is consistent with the circular hole. The front and rear ends of the conductive shaft are formed with annular ridges along the outer periphery that abut against the front and rear outer walls of the circular hole. The length between the front and rear annular ridges on the conductive shaft is consistent with the thickness of the conductive tile. The conductive shaft is set in the circular hole between the two conductive tiles and is limited by the annular ridge abutting against the outer wall of the conductive tile.

[0008] Furthermore, four penetrating connection countersunk holes are evenly opened axially on the conductive shaft, and the conductive shaft is connected to the welding wheel by passing long bolts through the connection countersunk holes.

[0009] Furthermore, there are four butterfly springs, and the four corners of the left conductive tile among the two conductive tiles are horizontally provided with through countersunk holes for installing the butterfly springs. The left side of the right conductive tile is provided with connecting holes corresponding to the through countersunk holes, and the connecting holes are inlaid with threaded sleeves. The butterfly spring is sleeved on the fixing bolts, and the fixing bolts are screwed into the threaded sleeves through the through countersunk holes to connect the two conductive tiles together.

[0010] Finally, a busbar connection block is installed on the right side of the right conductive tile, and the right conductive tile is connected to the busbar through the busbar connection block.

[0011] Compared with the prior art, the advantages of the utility model are: the conductive block is improved from the spherical contact form to the bearing contact form, which increases the contact area and ensures that the welding performance is more stable and reliable; the bearing contact form has lower uniform requirements for the disc spring preload force than the spherical form, and the maintenance is simpler and more convenient. The utility model has a simple and reasonable structure, is easy to use, has less wear on the conductive pad, and has stable and reliable welding performance. It effectively improves the overall conductivity of the welding head and greatly extends the service life of the welding head from the original 2 years to more than 6 years. The utility model can be widely used in resistance welding machines and similar welding machines, and has practical application significance for promotion to various types of plate and strip steel production and processing enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0013] Figure 2 It is a schematic diagram of the structure of the conductive shaft;

[0014] Figure 3 for Figure 2 The left side of the figure;

[0015] Figure 4 It is a schematic diagram of the structure of the conductive tile;

[0016] Figure 5 for Figure 4. DETAILED DESCRIPTION

[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0018] like Figures 1 to 5 As shown, a resistance welding head includes a box body 1 and left and right conductive tiles 3 and 4, a conductive shaft 5 and a welding wheel 2 installed on the box body 1. The left and right conductive tiles 3 and 4 are arranged on the rear side of the box body 1. The left and right conductive tiles 3 and 4 are two pieces arranged on the left and right. The two conductive tiles 3 and 4 are butt-jointed to form a circular hole 30 for the conductive shaft 5 to pass through. The conductive shaft 5 is passed through the circular hole 30 and connected to the welding wheel 2. The conductive shaft 5 contacts the left and right conductive tiles 3 and 4 through bearings. A butterfly spring 6 is provided between the left and right conductive tiles 3 and 4 to connect the two and apply pre-tightening force to the conductive shaft 5.

[0019] The specific structure is as follows: the height and thickness of the left and right conductive tiles 3 and 4 are consistent, the length of the right conductive tile 4 is greater than that of the left conductive tile 3, and the left and right conductive tiles 3 and 4 are respectively provided with semicircular holes symmetrically through them on the butt joint side. After the left and right conductive tiles 3 and 4 are butt jointed, a circular hole 30 with a certain gap is formed. The conductive shaft 5 is cylindrical, and the diameter of the conductive shaft 5 is consistent with that of the circular hole 30. The front and rear ends of the conductive shaft 5 are formed with annular convex edges 52 along the outer circumference to abut against the front and rear outer walls of the circular hole 30. The length between the front and rear annular convex edges 52 on the conductive shaft 5 is consistent with the thickness of the left and right conductive tiles 3 and 4. The conductive shaft 5 is arranged in the circular hole 30 between the left and right conductive tiles 3 and 4, and is limited by the annular convex edges 52 against the outer walls of the left and right conductive tiles 3 and 4. Four through-hole connection countersunk holes 51 are evenly provided on the conductive shaft 5 in the axial direction, and the conductive shaft 5 is connected to the welding wheel 2 by passing long bolts through the connection countersunk holes 51.

[0020] There are four butterfly springs 6, and the four corners of the left conductive tile 3 are laterally provided with through countersunk holes 31 for installing the butterfly springs 6. The left side of the right conductive tile 4 is provided with a connecting hole 41 corresponding to the through countersunk hole 31, and a screw sleeve is inlaid in the connecting hole 41. The butterfly spring 6 is sleeved on the fixing bolt, and the fixing bolt passes through the through countersunk hole 31 and is screwed into the screw sleeve to connect the left and right conductive tiles 3 and 4 together.

[0021] A busbar connecting block 7 is installed on the right side of the right conductive tile 4 , and the right conductive tile 4 is connected to the busbar 8 via the busbar connecting block 7 .

[0022] In this embodiment, the function of the conductive shaft 5 is to connect the conductive tiles 3 and 4 with the welding wheel 2; the function of the conductive tiles 3 and 4 is to connect the conductive shaft 5 with the busbar connection block; the function of the busbar connection block 7 is to connect the busbar 8 with the right conductive tile 4; the box 1 serves as a support seat for each component;

[0023] The function of the fixing bolt of the butterfly spring 5 is to ensure that there is a certain pre-tightening force between the conductive shaft 5 and the left and right conductive tiles 3 and 4 to maintain good contact.

[0024] The main function of the welding head is to lead the welding current from the rectifier to the welding wheel, and then press the stainless steel strip through the upper and lower welding wheels to form a loop. The upper and lower welding wheels rotate and move to weld the two steel coils together. Current flow: rectifier → busbar → busbar connection block → conductive tile → conductive shaft → upper welding wheel (the front is the upper welding head) → lower welding wheel (the back is the lower welding head) → conductive shaft → conductive tile → busbar connection block → busbar → rectifier.

[0025] This embodiment improves the conductive block from a spherical contact form to a bearing contact form, which increases the contact area and ensures that the welding performance is more stable and reliable; the bearing contact form has lower uniform requirements for the disc spring preload than the spherical form, and maintenance is simpler and more convenient. The conductive pad of the utility model has less wear, stable and reliable welding performance, effectively improves the overall conductivity of the welding head, and greatly extends the service life of the welding head, from the original 2 years to more than 6 years now. The utility model can be widely used in resistance welding machines and similar welding machines, and has practical application significance for promotion to various types of plate and strip steel production and processing enterprises.

[0026] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A resistance welding head, characterized in that: The resistance welding head includes a box body and a conductive tile, a conductive shaft and a welding wheel installed on the box body. The conductive tile is arranged on the rear side of the box body. The conductive tile is divided into two left and right pieces. After the two conductive tiles are butt-jointed, a circular hole for inserting the conductive shaft is formed. The conductive shaft is inserted into the circular hole and connected to the welding wheel. The conductive shaft contacts the conductive tile through the bearing. A butterfly spring is provided between the two conductive tiles to connect the two and apply pre-tightening force to the conductive shaft.

2. The resistance welding head according to claim 1, characterized in that: The two conductive tiles are butted together on one side with axially symmetrical semicircular holes, and a circular hole with a certain gap is formed after the two conductive tiles are butted together. The conductive shaft is cylindrical, and the diameter of the conductive shaft is consistent with the circular hole. The front and rear ends of the conductive shaft are formed with annular ridges along the outer circumference that abut against the front and rear outer walls of the circular hole. The length between the front and rear annular ridges on the conductive shaft is consistent with the thickness of the conductive tile. The conductive shaft is set in the circular hole between the two conductive tiles, and is limited by the annular ridge abutting against the outer wall of the conductive tile.

3. The resistance welding head according to claim 2, characterized in that: The conductive shaft is evenly and axially provided with four penetrating connection countersunk holes, and the conductive shaft is connected to the welding wheel by passing long bolts through the connection countersunk holes.

4. The resistance welding head according to claim 2 or 2 or 3, characterized in that: There are four butterfly springs. The four corners of the left conductive tile of the two conductive tiles are horizontally provided with through countersunk holes for installing the butterfly springs. The left side of the right conductive tile is provided with connecting holes corresponding to the through countersunk holes. The connecting holes are inlaid with threaded sleeves. The butterfly springs are sleeved on the fixing bolts. The fixing bolts pass through the through countersunk holes and are screwed into the threaded sleeves to connect the two conductive tiles together.

5. The resistance welding head according to claim 4, characterized in that: A busbar connecting block is installed on the right side of the right conductive tile, and the right conductive tile is connected to the busbar through the busbar connecting block.

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