A water-cooled clamp arm structure

Abstract

The present invention discloses a water-cooled clamp arm structure, comprising a clamp arm body, an electrode rod and an electrode cap, wherein one end of the clamp arm body is provided with a mounting hole, one end of the electrode rod is connected to the mounting hole, and the other end extends out of the mounting hole to connect to the electrode cap, and a groove for mounting a cooling water pipe and communicating with the mounting hole is arranged around the back of the clamp arm body, and the mounting hole and the longitudinal center section of the groove are the same section. The present invention has the advantages that the arrangement of the groove not only prevents the cooling water pipe from being exposed outside the clamp arm body, but also improves the cooling effect of the cooling water pipe on the clamp arm body, and at the same time, the arrangement that the mounting hole and the groove are connected through an arc transition and the longitudinal center section of the mounting hole and the groove are the same section cancels the adapter arranged between the original electrode rod and the cooling water pipe, which not only reduces the volume of the clamp arm mechanism end, but also solves the difficulty of installing the interface between the existing cooling water pipe and the electrode rod.

Description

Technical Field

[0001] The invention relates to the technical field of spot welding machines, in particular to a water-cooling clamp arm structure. Background Art

[0002] At present, robot resistance welding technology has been widely used in the field of automobile manufacturing. It has strict requirements on welding process and puts forward quite high requirements on resistance welding technology. As resistance welding, it refers to the welding method that uses columnar electrodes to form welding spots between the contact surfaces of two overlapping workpieces. During welding, pressure is first applied to make the workpieces in close contact, and then the current is turned on. The contact part of the workpiece melts under the action of resistance heat, and the welding spot is formed after cooling.

[0003] When the welding tongs are working, the electrode cap at the end of the electrode rod at the front end generates a lot of heat when welding with a large current, causing the shape of the electrode to change or wear, so the electrode cap needs to be cooled. At present, the existing cooling method is mainly to open grooves on both sides of the clamp arm body and connect the cooling water pipe with the adapter that cooperates with the electrode rod to form a loop. For example, Chinese Patent Invention Publication No. CN110524099A discloses a robot welding clamp arm device, in which the pipeline is installed in the groove on the side of the arm, and a water distribution block assembly is provided at the connection with the electrode rod; or a single or multiple pipe holes or ring holes are opened in the clamp arm body to insert water pipes or copper pipes, which are bent according to the shape of the clamp arm and passed to the inside of the electrode rod to form a cooling water loop. For example, Chinese Patent Invention Publication No. CN102962573A discloses a hanging welding electrode assembly, Chinese Patent Utility Model Publication No. CN207402331U discloses a single cooling loop robot welding clamp arm, and Chinese Patent Utility Model Publication No. CN207615856U discloses a spot welding special-shaped electrode water cooling structure. The technical solutions disclosed in the above patents all open a cooling circuit inside the clamp arm body. Obviously, the former has poor water pipe application effect and is easy to fall off, which may cause safety problems. At the same time, the water cooling adapter and the water pipe interface are difficult to install, resulting in a large clamp arm end. The latter has complex processing technology, high cost, and difficult disassembly and maintenance. However, due to the different welding work and different shapes of the clamp arm, the cooling mechanism of the existing technology can no longer meet the actual needs. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a water-cooled clamp arm structure which is anti-dropping and easy to install and maintain to cool the electrode cap.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A water-cooled clamp arm structure comprises a clamp arm body, an electrode rod and an electrode cap, wherein one end of the clamp arm body is provided with a mounting hole, one end of the electrode rod is connected to the mounting hole, and the other end extends out of the mounting hole to be connected to the electrode cap, a groove for clamping a cooling water pipe and communicating with the mounting hole is arranged around the back of the clamp arm body, and the mounting hole and the longitudinal center section of the groove are the same section.

[0007] The arrangement of the groove on the back side of the clamp arm body not only prevents the cooling water pipe from being exposed on the outside of the clamp arm body, and will not hook foreign objects when the clamp arm structure is working, nor will it cause damage to the cooling water pipe, thereby improving the safety of the clamp arm structure when working, but also increases the contact area of ​​the cooling water pipe on the clamp arm body, thereby improving the cooling effect of the cooling water pipe on the clamp arm body. At the same time, the mounting hole is connected to the groove and the mounting hole and the longitudinal center section of the groove are the same, so that the groove can be connected to the mounting hole, ensuring that the cooling water pipe can be sealed and connected to the electrode rod, thereby realizing cooling of the electrode cap on the electrode rod, and canceling the adapter arranged between the original electrode rod and the cooling water pipe, which not only reduces the volume of the end of the clamp arm mechanism, but also solves the problem of difficulty in installing the interface between the existing cooling water pipe and the electrode rod, and the clamp arm structure has a simple processing technology and low processing cost, and is also convenient for later maintenance.

[0008] Preferably, the mounting hole is connected to the groove through an arc transition.

[0009] Preferably, the end of the mounting hole away from the electrode rod is also connected to the transition connection structure, and the transition connection structure includes a transition tube, a sealing ring and a connecting tube. The transition tube is provided with an annular groove, and the sealing ring is tightly sleeved on the annular groove. One end of the transition tube is sleeved inside the connecting tube, and the outer wall of the transition tube is tightly fitted to the inner wall of the connecting tube, and the side of the end where the connecting tube and the transition tube are connected is tightly against the sealing ring. The other end of the connecting tube extends into the electrode rod and approaches the electrode cap. One end of the cooling water pipe is sleeved on the end of the transition tube away from the connecting tube, and the outer wall of the transition tube is tightly fitted to the inner wall of the cooling water pipe, and the side of the end where the cooling water pipe and the transition tube are connected is tightly against the sealing ring.

[0010] Preferably, a baffle is provided at the center of the groove along the extension direction of the groove, and the baffle divides the groove into a first groove and a second groove, which facilitates the installation and fixation of the cooling water pipe and prevents the cooling water pipe from falling off in the groove. At the same time, it also further increases the contact area of ​​the cooling water pipe on the clamp arm body, thereby improving the cooling effect of the cooling water pipe on the clamp arm body.

[0011] Preferably, a baffle is provided on the upper surface of the baffle plate for pressing the cooling water pipe to prevent the cooling water pipe from falling off from the groove.

[0012] Preferably, the mounting hole is connected to the first groove and the second groove respectively through a first connecting hole and a second connecting hole, and a short tube is arranged in the electrode rod, one end of the short tube is close to the electrode cap, and the other end is sealed and connected to the first connecting hole.

[0013] Preferably, the depth of the groove is greater than the outer diameter of the cooling water pipe, and the width of the groove is smaller than the outer diameter of the cooling water pipe.

[0014] Preferably, an electrode seat is also provided on the back of the clamp arm body, so that the cooling water pipe in the groove can cool the electrode seat, thereby realizing the cooling of the soft electrode installed on the electrode seat and improving the utilization rate of the cooling water.

[0015] Preferably, an opening parallel to the axial direction of the mounting hole is provided on the back side of the clamp arm body near the mounting hole, and the opening is connected to the mounting hole. The clamp arm body on both sides of the opening is provided with a plurality of threaded holes perpendicular to the opening, and locking screws are provided on the threaded holes to lock and fix the mounting hole to prevent the electrode rod from rotating in the mounting hole.

[0016] Preferably, C-shaped or X-shaped welding tongs arms.

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

[0018] 1. The arrangement of the groove on the back of the clamp arm body not only prevents the cooling water pipe from being exposed on the outside of the clamp arm body, but also prevents foreign objects from being hooked when the clamp arm structure is working, and also prevents the cooling water pipe from being damaged, thereby improving the safety of the clamp arm structure when working. The contact area of ​​the cooling water pipe on the clamp arm body is also increased, thereby improving the cooling effect of the cooling water pipe on the clamp arm body. At the same time, the mounting hole is connected to the groove, and the mounting hole and the longitudinal center section of the groove are the same, so that the groove can be connected to the mounting hole, ensuring that the cooling water pipe can be sealed and connected to the electrode rod, thereby realizing cooling of the electrode cap on the electrode rod, and canceling the adapter arranged between the original electrode rod and the cooling water pipe, which not only reduces the volume of the clamp arm mechanism end, but also solves the problem of difficulty in installing the interface between the existing cooling water pipe and the electrode rod, and the clamp arm structure has a simple processing technology and low processing cost, and is also convenient for later maintenance.

[0019] 2. The groove is divided into a first groove and a second groove by a baffle, which is convenient for the installation and fixation of the cooling water pipe and prevents the cooling water pipe from falling off in the groove. At the same time, the contact area of ​​the cooling water pipe on the clamp arm body is further increased, thereby improving the cooling effect of the cooling water pipe on the clamp arm body.

[0020] 3. The setting of the transition pipe and the sealing ring prevents water leakage between the cooling water pipe and the connecting pipe, improves the sealing performance, and extends into the electrode rod through the connecting pipe to approach the electrode cap, so that the cooling water in the water inlet pipe can directly cool the electrode cap, and the cooled cooling water is discharged from the end of the electrode rod into the water outlet pipe, thereby improving the cooling effect on the electrode cap.

[0021] 4. The baffle is provided to press the cooling water pipe, thereby further preventing the cooling water pipe from falling off from the groove.

[0022] 5. By arranging an electrode holder on the back of the clamp arm body, the cooling water pipe in the groove can cool the electrode holder, thereby realizing the cooling of the soft electrode installed on the electrode holder and improving the utilization rate of the cooling water. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of a water-cooled clamp arm structure according to Embodiment 1 of the present invention;

[0024] Figure 2 It is a schematic diagram of the partial structure of a clamp arm body according to an embodiment of the present invention;

[0025] Figure 3 is a cross-sectional view of the first embodiment of the present invention;

[0026] Figure 4 This is a structural schematic diagram of a transition connection structure according to an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of a transition tube according to a first embodiment of the present invention;

[0028] Figure 6 for Figure 3 A magnified view of middle;

[0029] Figure 7 for Figure 6 Another state structural diagram of;

[0030] Figure 8 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0031] Fig. 9 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0032] Fig.10 This is a schematic structural diagram of a clamp arm body according to a third embodiment of the present invention;

[0033] Fig.11 It is a partial cross-sectional view of the third embodiment of the present invention;

[0034] Fig.12 This is another partial cross-sectional view of the third embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0036] Embodiment 1

[0037] See also Figures 1 to 3 The present embodiment discloses a water-cooled clamp arm structure, comprising a clamp arm body 1, an electrode rod 2 and an electrode cap 3. In the present embodiment, the clamp arm body 1 is a clamp arm of a C-type welding clamp, one end of the clamp arm body 1 is provided with a mounting hole 11, one end of the electrode rod 2 is sealed and connected to the mounting hole 11, and the other end extends out of the mounting hole 11 to connect with the electrode cap 3. The clamp arm body 1 is provided with a groove 12 along the back side, so that a cooling water pipe 9 is stuck inside the groove 12 to prevent the cooling water pipe 9 from being exposed outside the clamp arm body 1. The cooling water pipe 9 can be a polyvinyl ketone tube or a copper tube with certain flexibility. When the clamp arm structure is working, it will not hook foreign objects, and will not cause damage to the cooling water pipe 9, thereby improving the safety of the clamp arm structure when working. At the same time, it also increases the contact area of ​​the cooling water pipe 9 on the clamp arm body 1, thereby improving the cooling effect of the cooling water pipe 9 on the clamp arm body 1. In addition, the processing technology of the clamp arm structure is simple and the processing cost is low, and the later maintenance is also convenient.

[0038] The back side of the clamp arm body 1 near the mounting hole 11 is also provided with an opening 13 parallel to the axial direction of the mounting hole 11, and the opening 13 is communicated with the mounting hole 11. The clamp arm body 1 on both sides of the opening 13 is provided with a plurality of threaded holes 14 perpendicular to the opening 13. In the present embodiment, two threaded holes 14 are provided, and locking screws (not shown) are provided on the threaded holes 14. Specifically, after the electrode rod 2 is installed to the mounting hole 11, the clamp arm body 1 on both sides of the opening 13 is locked by rotating the locking screws, and the width of the opening 13 is reduced, thereby realizing the locking and fixing of the mounting hole 11 to prevent the electrode rod 2 from rotating in the mounting hole 11.

[0039] The mounting hole 11 is connected with the groove 12 through an arc transition, and the longitudinal center sections of the mounting hole 11 and the groove 12 are the same section, so that the groove 12 can be connected with the mounting hole 11, thereby ensuring that the cooling water pipe 9 can be sealed and connected with the electrode rod 2, specifically, it can be sealed and connected through a sealant, or it can be sealed and connected through the transition connection structure 7, so as to realize cooling of the electrode cap 3 on the electrode rod 2, and cancel the adapter provided between the original electrode rod 2 and the cooling water pipe 9, which not only reduces the volume of the end of the clamp arm mechanism, but also solves the difficulty of installing the interface between the existing cooling water pipe 9 and the electrode rod 2.

[0040] For details, see Figure 4 and Figure 5 The transition connection structure 7 includes a transition pipe 71, a sealing ring 72 and a connecting pipe 73. The transition pipe 71 is provided with an annular groove 711, and the sealing ring 72 is tightly sleeved on the annular groove 711. One end of the transition pipe 71 is sleeved inside the connecting pipe 73. The outer wall of the transition pipe 71 is tightly fitted to the inner wall of the connecting pipe 73, and the side of the end of the connecting pipe 73 connected to the transition pipe 71 is tightly attached to the sealing ring 72. The other end of the connecting pipe 73 extends into the electrode rod 2 and approaches the electrode cap 3, so that the cooling water in the cooling water pipe 9 can directly cool the electrode cap 3, and the cooled cooling water is discharged from the end of the electrode rod 2 into the water outlet pipe, thereby improving the cooling effect on the electrode cap 3. Similarly, one end of the cooling water pipe 9 is sleeved on the end of the transition pipe 71 away from the connecting pipe 73, the outer wall of the transition pipe 71 is tightly fitted on the inner wall of the cooling water pipe 9, and the side of the end where the cooling water pipe 9 and the transition pipe 71 are connected is tightly attached to the sealing ring 72, thereby realizing the connection between the cooling water pipe 9 and the connecting pipe 73, and the setting of the transition pipe 71 and the sealing ring 72 prevents water leakage between the cooling water pipe 9 and the connecting pipe 73.

[0041] For further information, see Figure 6 A baffle 4 is provided at the center of the groove 12 along the extending direction of the groove 12, and the baffle 4 divides the groove 12 into a first groove 121 and a second groove 122. Generally, the cooling water pipe 9 includes an inlet pipe and an outlet pipe. The first groove 121 is used to install the inlet pipe, and the second groove 122 is used to install the outlet pipe. The inlet pipe is separated from the outlet pipe, which is convenient for the installation and fixation of the inlet pipe and the outlet pipe, and prevents the inlet pipe and the outlet pipe from falling off in the groove 12. At the same time, the contact area of ​​the cooling water pipe 9 on the clamp arm body 1 is further increased, thereby improving the cooling effect of the cooling water pipe 9 on the clamp arm body 1.

[0042] Furthermore, a plurality of screw holes are arranged at intervals on the upper surface of the baffle 4, and screws (not shown in the figure) matching the screw holes are fixed on the bottom surface of the baffle 5, so that the baffle 5 can be rotatably fixed on the upper surface of the baffle 4, and the width of the baffle 5 is not greater than the thickness of the baffle 4, and the length is greater than the width of the groove 12. Specifically, referring to FIG. 6, before the cooling water pipe 9 is installed, the baffle 5 is rotated to be parallel to the baffle 4 to facilitate the installation of the cooling water pipe 9, referring to FIG. Figure 7 When the cooling water pipe 9 is installed, the baffle 5 is rotated to be perpendicular to the baffle 4 to press the cooling water pipe 9 to prevent the cooling water pipe 9 from falling off from the groove 12.

[0043] Furthermore, the depth of the groove 12 is greater than the outer diameter of the cooling water pipe 9, and the width of the groove 12 is less than the outer diameter of the cooling water pipe 9, so that the cooling water pipe 9 can be pressed into the inside of the groove 12 respectively, which not only further prevents the cooling water pipe 9 from falling off from the groove 12, but also increases the contact area between the cooling water pipe 9 and the clamp arm body 1, thereby improving the cooling effect of the cooling water pipe 9 on the clamp arm body 1.

[0044] The working principle of the present invention is: after the electrode rod 2 is first installed to the mounting hole 11, the clamp arm body 1 on both sides of the opening 13 is locked by rotating the locking screw, the width of the opening 13 is reduced, and the mounting hole 11 is locked and fixed to prevent the electrode rod 2 from rotating in the mounting hole 11, and then the baffle 5 is rotated to be parallel to the baffle 4, and the cooling water pipe 9 is installed in the groove 12. Since the mounting hole 11 and the groove 12 are connected through an arc transition, and the longitudinal center sections of the mounting hole 11 and the groove 12 are the same, the groove 12 can be connected with the mounting hole 11, thereby ensuring that the cooling water pipe 9 can be sealed and connected with the electrode rod 2, and the original adapter is cancelled. After the cooling water pipe 9 is installed, the baffle 5 is rotated to make it perpendicular to the baffle 4, which is used to press the cooling water pipe 9 to prevent the cooling water pipe 9 from falling off from the groove 12, thereby preventing the cooling water pipe 9 from being exposed on the outside of the clamp arm body 1. Finally, when the clamp arm structure is working, cooling water is injected into the water inlet pipe inside the first groove 121 and enters the electrode rod 2 to cool the electrode cap 3. At the same time, the cooling water is discharged through the water outlet pipe inside the second groove 122, thereby cooling the electrode cap 3.

[0045] Embodiment 2

[0046] See also Figure 8 In this embodiment, based on the first embodiment, an electrode holder 6 is further provided at one end of the back side of the clamp arm body 1 away from the electrode rod 2. Specifically, the electrode holder 6 is fixed to the back side of the clamp arm body 1 by screws, so that the cooling water pipe 9 in the groove 12 can cool the electrode holder 6, thereby realizing the cooling of the soft electrode installed on the electrode holder 6 and improving the utilization rate of the cooling water. In addition, it should be noted that in this embodiment, the depth of the groove 12 at the bottom of the electrode holder 6 is less than the outer diameter of the cooling water pipe 9, so that the cooling water pipe 9 is exposed from the groove 12 and can be attached to the bottom surface of the electrode holder 6, thereby improving the cooling effect on the electrode holder 6.

[0047] Embodiment 3

[0048] See also Fig. 9 and Fig.12The difference between this embodiment and the first embodiment is that the welding clamp body 1 is an X-shaped welding clamp arm, and the mounting hole 11 and the groove 12 are at a straight angle, and cannot be directly connected to the electrode cap 3 through an arc transition. See Figures 11 and Fig.12 , by setting a first connecting hole 15 and a second connecting hole 16, the first groove 121 is connected to the mounting hole 11 and the second groove 122 is connected to the mounting hole 11 respectively. A short tube 8 is provided in the electrode rod 2, one end of the short tube 8 is close to the electrode cap 3, and the other end extends out of the electrode rod 2 and is sealed and connected to the first connecting hole 15. The water outlet of the water inlet pipe is sealed and connected to the first groove 121 set inside the clamp arm body 1. The cooling water flows from the first groove 121, the first connecting hole 15 and the short tube 8 set inside the clamp arm body 1 to the inner wall of the electrode cap 3 in sequence, so as to realize the connection between the water inlet pipe and the short tube 8. The water inlet of the water outlet pipe is sealed and connected to the second groove 122 set inside the clamp arm body 1. The cooling water flows to the drain pipe through the second connecting hole 16 and the second groove 122 set inside the clamp arm body 1 for the output of the cooling water, thereby ensuring the circulating output of the cooling water.

[0049] Furthermore, the end of the short tube 8 close to the electrode cap is beveled, which increases the contact area between the cooling water and the electrode cap 3 and improves the cooling effect on the cooling cap.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A water-cooled clamp arm structure, characterized in that: The invention comprises a clamp arm body, an electrode rod and an electrode cap, wherein one end of the clamp arm body is provided with a mounting hole, one end of the electrode rod is connected with the mounting hole, and the other end extends out of the mounting hole and is connected with the electrode cap, a groove for clamping a cooling water pipe and communicating with the mounting hole is arranged around the back of the clamp arm body, and the longitudinal center section of the mounting hole and the groove are the same section; the mounting hole is communicated with the groove through an arc transition, and the end of the mounting hole away from the electrode rod is also connected with a transition connection structure, and the transition connection structure comprises a transition pipe, a sealing ring and a connecting pipe, an annular groove is provided on the transition pipe, and the sealing ring is tightly sleeved on the annular groove, one end of the transition pipe is sleeved inside the connecting pipe, the outer wall of the transition pipe is tightly fitted on the inner wall of the connecting pipe, and the side of the end head of the connecting pipe connected with the transition pipe is tightly against the sealing ring, and the other end of the connecting pipe extends into the electrode rod and approaches the electrode cap, one end of the cooling water pipe is sleeved on the end of the transition pipe away from the connecting pipe, the outer wall of the transition pipe is tightly fitted on the inner wall of the cooling water pipe, and the side of the end head of the cooling water pipe connected with the transition pipe is tightly against the sealing ring.

2. The water-cooled clamp arm structure according to claim 1, characterized in that: A baffle is arranged at the center of the groove along the extending direction of the groove, and the baffle divides the groove into a first groove and a second groove.

3. The water-cooled clamp arm structure according to claim 2, characterized in that: The upper surface of the baffle plate is provided with a baffle.

4. The water-cooled clamp arm structure according to claim 2, characterized in that: The mounting hole is connected to the first groove and the second groove through the first connecting hole and the second connecting hole respectively. A short tube is arranged in the electrode rod. One end of the short tube is close to the electrode cap, and the other end is sealed and connected to the first connecting hole.

5. The water-cooled clamp arm structure according to claim 1, characterized in that: The depth of the grooves is greater than the outer diameter of the cooling water pipe, and the width of the grooves is less than the outer diameter of the cooling water pipe.

6. The water-cooled clamp arm structure according to claim 1, characterized in that: An electrode seat is also arranged on the back of the clamp arm body.

7. The water-cooled clamp arm structure according to claim 1, characterized in that: The back side of the clamp arm body near the mounting hole is also provided with an opening parallel to the axial direction of the mounting hole, the opening is connected to the mounting hole, and the clamp arm body on both sides of the opening is provided with a plurality of threaded holes perpendicular to the opening, and locking screws are provided on the threaded holes.

8. The water-cooled clamp arm structure according to claim 1, characterized in that: The clamp arm body is a C-shaped or X-shaped welding clamp arm.

Images