A fixed spot welding machine based on servo control

Abstract

The present invention belongs to the technical field of spot welding machines. The present invention discloses a fixed spot welding machine based on servo control, including a base and an upper support frame and a lower support frame fixed to one side of the base from top to bottom in sequence. The bottom of the upper support frame is slidably connected with a slide cylinder, and the slide cylinder and the lower support frame are fixedly installed with a fixed frame, and the two fixed frames are fixed with electrode arms, and the two electrode arms are provided with a clamping mechanism, and the two clamping mechanisms clamp an electrode grip rod; the clamping mechanism includes a fixed ring fixed in the electrode arm and a plurality of third guide rods fixedly installed on the fixed ring, and a sliding ring is slidably connected between the plurality of third guide rods, and the fixed ring and the sliding ring are rotatably connected with a plurality of clamp rods arranged in a circumferential array. The clamping mechanism of the present invention can quickly replace the electrode grip rod, and can clamp and fix electrode grip rods of different sizes, thereby increasing practicality.

Description

Technical Field

[0001] The invention belongs to the technical field of spot welding machines, and in particular relates to a fixed spot welding machine based on servo control. Background Art

[0002] At present, spot welding machines usually include two electrodes, upper and lower, and the lower electrode is usually fixed. The upper electrode moves and presses down the workpiece, so that the two electrodes clamp the workpiece to perform welding. The electrode of the spot welding machine is often fixed to the end of the electrode holder, and then the electrode holder is fixedly clamped on the electrode arm, such as Figure 1 As shown, the existing electrode holder is mostly fixed by bolts passing through the end cover and screwing it with the electrode arm to clamp it. The slot on the electrode arm corresponds to the size of the electrode holder. Usually, when replacing electrode holders and electrodes of different sizes, the electrode arm must be replaced together, which is troublesome to operate and leads to low efficiency. Summary of the invention

[0003] The object of the present invention is to provide a fixed spot welding machine based on servo control, so as to solve the problem of low efficiency in replacing electrode gripping rods of existing spot welding machines.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A fixed spot welding machine based on servo control, comprising a base and an upper support frame and a lower support frame fixed to one side of the base from top to bottom in sequence, wherein a slide cylinder is slidably connected to the bottom of the upper support frame, and a fixing frame is fixedly installed on the slide cylinder and the lower support frame, and an electrode arm is fixed in the two fixing frames, and a clamping mechanism is provided in the two electrode arms, and an electrode holding rod is clamped in the two clamping mechanisms, and an electrode is fixed at one end of the two electrode holding rods, and the two electrodes are arranged opposite to each other;

[0006] The clamping mechanism includes a fixed ring fixed in the electrode arm and a plurality of third guide rods fixedly installed on the fixed ring, a sliding ring is slidably connected between the plurality of third guide rods, and a plurality of clamping rods arranged in a circumferential array are rotatably connected to the fixed ring and the sliding ring, and two groups of the clamping rods are located between the fixed ring and the sliding ring, and the outer sides of the plurality of clamping rods connected to the fixed ring are in sliding contact with the inner side of the sliding ring, and the outer sides of the plurality of clamping rods connected to the sliding ring are in sliding contact with the inner side of the fixed ring.

[0007] Preferably, a spiral sleeve is rotatably connected to the electrode arm, a movable frame is screwed inside the spiral sleeve, and one end of the movable frame is fixedly connected to the sliding ring.

[0008] Preferably, the clamping rod is an L-shaped structure, and a reset frame is slidably connected between the fixed ring and the sliding ring and the corresponding connected clamping rods, and a fixed plate that abuts against one end of the clamping rod is fixed on the two reset frames, and a plurality of second springs are respectively fixedly connected between the two reset frames and the adjacent fixed rings and sliding rings, and the plurality of second springs are respectively sleeved on the outside of a plurality of third guide rods.

[0009] Preferably, a servo motor is fixedly mounted on the upper support frame, a first screw rod is fixedly connected to the output end of the servo motor, the slide cylinder is screwed together with the first screw rod, a second guide rod is fixedly mounted on one side of the slide cylinder, and one end of the second guide rod slides into the upper support frame.

[0010] Preferably, the lower support frame is symmetrically rotatably connected to two support bases on both sides, and multiple first guide rods are slidably connected to the two support bases. Support platforms are fixedly installed on the tops of the two groups of the first guide rods, and first springs are sleeved on the outer sides of the two groups of the first guide rods, and the two ends of the multiple first springs are respectively fixedly connected to the corresponding support platforms and support bases, and screws with one end sliding through the support base are fixedly installed on the bottoms of the two support platforms, and nuts are screwed on the two screws, and the two nuts are respectively located below the two support bases.

[0011] Preferably, the support base is provided with a first card hole and a second card hole, and the first card hole and the second card hole are respectively located on both sides of the rotation axis of the support base, and the lower support frame is slidably connected with two card frames that slide with the first card hole and the second card hole respectively, and one end of the two card frames is provided with an inclined surface that interferes with the support base.

[0012] Preferably, a slide is slidably provided inside the lower support frame, and a connecting rod is rotatably connected between the slide and the two card frames, one end of the slide is fixedly connected to a slide rod that slides out of the lower support frame, one end of the slide rod is fixedly installed with a pull rod, a third spring is sleeved on the outer side of the slide rod, and the third spring is located between the slide and the lower support frame.

[0013] Preferably, the two support platforms are both slidably connected with clamping plates, the bottoms of the two support platforms are both rotatably connected with second screw rods, and the two second screw rods are respectively screwed together and penetrate the two clamping plates.

[0014] Preferably, the spiral directions of the two second screw rods are the same, one end of the two second screw rods are fixedly connected to two baffles, a ratchet is slidably connected between each group of two baffles, and a fourth spring is fixedly connected between the ratchet and one of the baffles, one end of the two ratchets is provided with a tooth groove of a right-angled triangle structure, and the tooth groove ends of the two ratchet wheels are inserted into and matched with each other.

[0015] Preferably, a water inlet chamber and a water outlet chamber are provided in the electrode grip rod, and a water inlet and a water outlet are provided on one side of the water inlet chamber and the water outlet chamber respectively. A connecting pipe is connected between the water inlet chamber and the water outlet chamber, and one end of the connecting pipe extends into the water outlet chamber to an end away from the water outlet.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The present invention is provided with a clamping mechanism. When replacing the electrode grip, the electrode grip is inserted between a plurality of clamping rods, and then the sliding ring is moved close to the fixed ring, so that the sliding ring and the inner side of the sliding ring respectively push the two groups of clamping rods to rotate inward, thereby clamping the electrode grip. In this way, the electrode grip can be quickly replaced, and electrode grips of different sizes can be clamped and fixed, thereby increasing practicality.

[0018] (2) As mentioned above, the electrode holder drives the electrode to press the workpiece down to reach a set pressure before welding can be performed. Therefore, there is a certain friction between the electrode holder and the clamp rod during welding. The two sets of clamp rods are in an inclined state when clamping the electrode holder, and the two sets of clamp rods face different directions. Therefore, when the upper and lower electrode holders apply pressure, there is always a set of clamp rods that tends to rotate inward under the action of friction, thereby increasing the clamping force and preventing the electrode holder from moving relative to the clamp rod, thereby ensuring the pressure during welding and avoiding false welds.

[0019] (3) The present invention is provided with a reset frame, a fixed plate and a second spring, and the clamping rod is an L-shaped structure. When clamping the electrode gripping rod, the other end of the clamping rod pushes the fixed plate on the reset frame, so that the reset frame compresses the second spring. Therefore, when the sliding fixed ring moves away from the fixed ring to loosen the clamping, the elastic force of the second spring causes the fixed plate on the reset frame to push one end of the clamping rod so that the outer side of the clamping rod always contacts the inner side of the fixed ring or the sliding ring. In this way, when the clamping is loosened, multiple clamping rods are in an open state, and the electrode gripping rod can be directly inserted when replaced, which is simple to operate and highly efficient.

[0020] (4) The present invention is provided with a support platform and a first spring. During welding, the workpiece is supported on the electrode located below. However, since the end surface of the electrode is small, it also needs to be manually held, which makes the labor intensity high. Therefore, the support platform can support the workpiece to reduce the labor intensity. At the same time, the electrode located below is prone to wear during welding. When the electrode located above presses down on the workpiece, the support platform can move downward to compress the first spring, thereby compressing the wear of the electrode to ensure the welding pressure and avoid cold welding. In addition, a screw is fixed at the bottom of the support platform. By turning the nut, the distance between the support platform and the support base can be adjusted, thereby controlling the initial height of the support platform, so that it can be used for welding operations of small curved workpieces, thereby increasing practicality.

[0021] (5) The present invention provides a support base and a clamping frame. When the support base rotates, one side of the support base contacts with the inclined surface of one end of the clamping frame and pushes the clamping frame upward. The slide is pulled by the connecting rod to compress the third spring until the clamping frame moves to the top of the first clamping hole or the second clamping hole. Under the elastic force of the third spring, the slide drives the clamping frame downward through the connecting rod and extends into the first clamping hole or the second clamping hole, thereby realizing the limited fixation of the support base. When the support platform is located in front of the lower support frame, it can support workpieces with slats and small curved surfaces, reducing manual labor intensity. When the support platform is located on both sides of the lower support frame, large curved surfaces or annular workpieces can be directly mounted and supported on the electrode, avoiding the support platform affecting the placement of large curved surfaces or annular workpieces, thereby increasing the practicality of the equipment. The limiting structure of the support base is simple to operate and has a high adjustment efficiency.

[0022] (6) The present invention is provided with a clamping plate, a second screw rod, a fourth spring and a ratchet. When the two support platforms are located in front of the lower support frame, the tooth groove ends of the two ratchet wheels are inserted into each other. Rotating one of the second screw rods causes the corresponding clamping plate to move toward the middle. At this time, the oblique sides of the two ratchet tooth grooves collide, causing the two ratchets to move relative to each other and compress the fourth spring, thereby not driving the other second screw rod to rotate. Similarly, according to the same spiral direction of the two second screw rods, the other screw rod can also be rotated alone to move the corresponding clamping plate toward the middle; conversely, when the second screw rod is opposite to the above-mentioned rotation direction, the right-angled sides of the two ratchet tooth grooves collide with each other, thereby causing the two second screw rods to rotate synchronously, thereby causing the two clamping plates to move synchronously in the same direction. In this way, the welding position of the workpiece can be adjusted without adjusting the clamping of the clamping plates one by one, thereby improving the adjustment efficiency.

[0023] (7) The present invention is provided with a connecting pipe, one end of which extends into the water outlet cavity to a position far away from the water outlet, so that the cooling water can be circulated and cooled, thereby improving the cooling effect and cooling efficiency and increasing the service life of the electrode grip. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a prior art structure diagram;

[0025] Figure 2 is a first stereogram of the present invention;

[0026] Figure 3 is a second stereogram of the present invention;

[0027] Figure 4 is a third stereogram of the present invention;

[0028] Figure 5 It is a cross-sectional view of the upper support frame assembly of the present invention;

[0029] Figure 6 for Figure 5 A magnified image of point A;

[0030] Figure 7 It is a cross-sectional view of the lower support frame assembly of the present invention;

[0031] Figure 8 It is a three-dimensional diagram of the threaded sleeve assembly of the present invention;

[0032] Fig. 9 It is a cross-sectional view of the threaded sleeve assembly of the present invention;

[0033] Fig.10 It is an exploded view of the clamping mechanism assembly of the present invention;

[0034] Fig.11 It is a cross-sectional view of the clamping mechanism assembly of the present invention;

[0035] Fig.12 A three-dimensional diagram of the support platform assembly of the present invention;

[0036] Fig.13 A first cross-sectional view of the support platform assembly of the present invention;

[0037] Fig.14 A second cross-sectional view of the support platform assembly of the present invention;

[0038] Fig.15 A three-dimensional diagram of the ratchet assembly of the present invention;

[0039] Fig.16 It is a cross-sectional view of the ratchet assembly of the present invention;

[0040] Fig.17 is a cross-sectional view of the electrode grip rod of the present invention;

[0041] In the figure: 1, base; 2, upper support frame; 3, servo motor; 4, slide; 5, fixed frame; 6, electrode arm; 7, electrode grip; 8, electrode; 9, lower support frame; 10, first guide rod; 11, first spring; 12, support base; 13, support platform; 14, screw; 15, nut; 16, first screw rod; 17, second guide rod; 18, spiral sleeve; 19, moving frame; 20, sliding ring; 21, fixed plate; 22, reset frame; 23, clamping rod; 24, fixed ring; 25, third guide rod; 26, second spring; 27, pull rod; 28, slide rod; 29, third spring; 30, connecting rod; 31, bracket; 32, first clamping hole; 33, second clamping hole; 34, bracket; 35, clamping plate; 36, second screw rod; 37, fourth spring; 38, ratchet; 39, baffle; 40, connecting pipe. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] See also Figure 2-Figure 17 As shown, the present invention provides the following technical solutions:

[0044] A fixed spot welding machine based on servo control, comprising a base 1 and an upper support frame 2 and a lower support frame 9 fixed to one side of the base 1 from top to bottom, a slide 4 is slidably connected to the bottom of the upper support frame 2, a fixed frame 5 is fixedly installed on the slide 4 and the lower support frame 9, an electrode arm 6 is fixed in the two fixed frames 5, a clamping mechanism is provided in the two electrode arms 6, an electrode gripping rod 7 is clamped in the two clamping mechanisms, an electrode 8 is fixed at one end of the two electrode gripping rods 7, and the two electrodes 8 are arranged opposite to each other;

[0045] A servo motor 3 is fixedly mounted on the upper support frame 2, and a first screw rod 16 is fixedly connected to the output end of the servo motor 3. The slide cylinder 4 is screwed together with the first screw rod 16, and a second guide rod 17 is fixedly mounted on one side of the slide cylinder 4. One end of the second guide rod 17 slides into the upper support frame 2.

[0046] Based on the above disclosed structure, when performing spot welding operation:

[0047] First, the two electrode holders 7 are clamped in the two electrode arms 6 by the clamping mechanism, and the two electrodes 8 are fixed to the ends of the two electrode holders 7 respectively. Then, the workpiece to be welded is placed above the electrode 8 located below, and the servo motor 3 is started to drive the first screw rod 16 to rotate, so that the screw-connected slide cylinder 4 descends in the upper support frame 2, and the second guide rod 17 slides in the upper support frame 2, so that the slide cylinder 4 drives the bottom fixed frame 5 to descend, and then the electrode arm 6 drives the electrode holder 7 to descend through the clamping mechanism, so that the upper electrode 8 presses the workpiece against the lower electrode 8 from above, and the pressure of the upper electrode 8 on the workpiece reaches the set value to perform welding, and finally, the servo motor 3 is started to drive the first screw rod 16 to rotate in the opposite direction, so that the slide cylinder 4 rises, and the fixed frame 5 and the electrode arm 6 drive the electrode holder 7 to rise through the clamping mechanism, so that the electrode 8 is separated from the workpiece, thereby completing the welding operation.

[0048] As mentioned above, the clamping mechanism for clamping the electrode gripper 7 is preferably provided with the following structure:

[0049] The clamping mechanism includes a fixed circular ring 24 fixed in the electrode arm 6 and a plurality of third guide rods 25 fixedly mounted on the fixed circular ring 24, a sliding circular ring 20 is slidably connected between the plurality of third guide rods 25, a plurality of clamping rods 23 arranged in a circumferential array are rotatably connected to both the fixed circular ring 24 and the sliding circular ring 20, two groups of clamping rods 23 are located between the fixed circular ring 24 and the sliding circular ring 20, and the outer sides of the plurality of clamping rods 23 connected to the fixed circular ring 24 are in sliding contact with the inner side of the sliding circular ring 20, and the outer sides of the plurality of clamping rods 23 connected to the sliding circular ring 20 are in sliding contact with the inner side of the fixed circular ring 24;

[0050] A spiral sleeve 18 is rotatably connected to the electrode arm 6 , a movable frame 19 is screwed inside the spiral sleeve 18 , and one end of the movable frame 19 is fixedly connected to a sliding ring 20 .

[0051] As can be seen from the above, the electrode gripper 7 is passed through the electrode arm 6 and positioned between the plurality of clamping rods 23, and then the spiral sleeve 18 is rotated so that the screw-connected movable frame 19 drives the sliding ring 20 to approach the fixed ring 24. Since the outer sides of the plurality of clamping rods 23 connected to the fixed ring 24 slide against the inner side of the sliding ring 20, the outer sides of the plurality of clamping rods 23 connected to the sliding ring 20 slide against the inner side of the fixed ring 24, so that the inner sides of the fixed ring 24 and the sliding ring 20 respectively push a corresponding group of clamping rods 23 to rotate inward, so that the ends of the plurality of clamping rods 23 press against the electrode gripper 7, thereby achieving the clamping of the electrode gripper 7, and the electrode grippers 7 of different diameters can be clamped according to the distance between the fixed ring 24 and the sliding ring 20, which is simple to operate and highly efficient.

[0052] Preferably, the fixed ring 24, the sliding ring 20 and the plurality of clamping rods 23 are all made of hard conductive materials to ensure that the current can be conducted while the electrode gripping rod 7 is clamped, so that the welding operation can proceed smoothly.

[0053] In addition, the two groups of clamping rods 23 are in an inclined state when clamping the electrode holding rod 7, and the two groups of clamping rods 23 face different directions. When the electrode holding rod 7 drives the electrode 8 to press the workpiece, the workpiece will respectively generate thrust on the two electrodes 8 and the electrode holding rod 7, so that friction is generated between the end of the clamping rod 23 and the electrode holding rod 7. Due to the different directions of the two groups of clamping rods 23, when the upper and lower electrode holding rods 7 are subjected to thrust, one group of clamping rods 23 can generate a tendency to rotate inward under the action of friction, thereby increasing the clamping force on the electrode holding rod 7, thereby preventing the electrode holding rod 7 from sliding, and avoiding the occurrence of cold welding that affects the welding quality.

[0054] In addition, the clamping rod 23 is an L-shaped structure, and a reset frame 22 is slidably connected between the fixed ring 24 and the sliding ring 20 and the correspondingly connected clamping rod 23. A fixed plate 21 that abuts against one end of the clamping rod 23 is fixed on the two reset frames 22. A plurality of second springs 26 are respectively fixedly connected between the two reset frames 22 and the adjacent fixed rings 24 and sliding rings 20, and the plurality of second springs 26 are respectively sleeved on the outside of a plurality of third guide rods 25. Based on this, when the two groups of clamping rods 23 rotate to clamp the electrode holding rod 7, one end of the L-shaped clamping rod 23 pushes the fixed plate 21 to move, so that the two reset frames 22 are respectively close to the fixed ring 24 and the sliding ring 20, so that the two groups of clamping rods 23 compress the two groups of second springs 26 respectively, so that when the clamping is released, the spiral sleeve 18 is rotated so that the screw-connected movable frame 19 drives the sliding ring 20 away from the fixed ring 24, so that the fixed ring 24 and the sliding ring 20 are away from the corresponding group of clamping rods 23. At this time, under the elastic force of the second spring 26, the reset frame 22 drives the fixed plate 21 to always contact the end of the clamping rod 23, thereby pushing the clamping rod 23 to rotate outward, so that the outer sides of the two groups of clamping rods 23 are always against the inner sides of the fixed ring 24 and the sliding ring 20 respectively, so that the two groups of clamping rods 23 are in an open state, which is convenient for directly inserting electrode holding rods 7 of different diameters, thereby improving the efficiency of replacing and clamping the electrode holding rod 7.

[0055] In addition, regarding the lower support frame 9, it is preferably provided with the following structure:

[0056] The lower support frame 9 is symmetrically rotatably connected to two support bases 12 on both sides, and multiple first guide rods 10 are slidably connected to the two support bases 12. Support platforms 13 are fixedly installed on the tops of the two groups of first guide rods 10. First springs 11 are sleeved on the outer sides of the two groups of first guide rods 10, and the two ends of the multiple first springs 11 are respectively fixedly connected to the corresponding support platforms 13 and support bases 12. The bottoms of the two support platforms 13 are fixedly installed with screws 14 at one end that slide through the support base 12. Nuts 15 are screwed on the two screws 14, and the two nuts 15 are respectively located below the two support bases 12.

[0057] It can be seen from the above that when welding a plate-like workpiece, the two support bases 12 can be rotated so that the multiple first guide rods 10 drive the support platform 13 to rotate to the front of the lower support frame 9, and the two support platforms are located on the outside of the electrode gripping rod 7, so that the plate-like workpiece can be directly placed on the two support platforms 13, so that there is no need for manual hand-holding of the workpiece for a long time, thereby reducing the labor intensity of the workers; in addition, during the welding operation, the electrode 8 located below is prone to wear, so that the end position of the electrode 8 located below drops, and the electrode 8 located above pushes the workpiece downward so that the support platform 13 moves downward to compress the first spring 11, thereby ensuring that the bottom of the workpiece can be tightly pressed against the electrode 8 located below, and the electrode 8 applies a force to the workpiece to reach a set value before welding, thereby compensating for the wear of the electrode 8, and there is no need to frequently adjust the height of the electrode 8, thereby improving efficiency.

[0058] In addition, the nut 15 can be rotated to move along the screw rod 14. Under the elastic force of the first spring 11, the support platform 13 is supported by the screw rod 14 so that the nut 15 always contacts the bottom surface of the support base 12. In this way, the distance between the support platform 13 and the support base 12 can be adjusted, thereby controlling the initial height of the support platform 13, so that it can be suitable for welding operations of small curved workpieces.

[0059] In addition, when welding large curved workpieces or annular workpieces, the two support bases 12 can be rotated so that the multiple first guide rods 10 drive the support platform 13 to rotate to both sides of the lower support frame 9, leaving space on both sides of the electrode gripping rod 7 to facilitate the placement of large curved workpieces or annular workpieces.

[0060] As mentioned above, regarding the position limitation of the support platform, it is preferred to have the following structure:

[0061] The support base 12 is provided with a first clamping hole 32 and a second clamping hole 33, and the first clamping hole 32 and the second clamping hole 33 are respectively located on both sides of the rotation axis of the support base 12, and the lower support frame 9 is slidably connected with two clamping frames 31 that are slidably matched with the first clamping hole 32 and the second clamping hole 33, respectively, and one end of the two clamping frames 31 is provided with an inclined surface that contacts the support base 12;

[0062] A slide 34 is slidably provided inside the lower support frame 9, and a connecting rod 30 is rotatably connected between the slide 34 and the two brackets 31. One end of the slide 34 is fixedly connected to a slide rod 28 that slides out of the lower support frame 9, and one end of the slide rod 28 is fixedly installed with a pull rod 27. A third spring 29 is sleeved on the outer side of the slide rod 28, and the third spring 29 is located between the slide 34 and the lower support frame 9.

[0063] As can be seen from the above, when the two support platforms 13 are fixed to the front side of the lower support frame 9, the support base 12 is rotated so that the side of the support base 12 close to the first clamping hole 32 contacts the inclined surface of the end of the clamping frame 31, and the support base 12 is continued to be rotated so that the support base 12 pushes the clamping frame 31 upward through the inclined surface, so that the clamping frame 31 drives the slide 34 to slide in the lower support frame 9 through the connecting rod 30, and at the same time, the slide 34 compresses the third spring 29 until the clamping frame 31 moves to the top of the first clamping hole 32. At this time, under the elastic force of the third spring 29, the slide 34 slides so that the connecting rod 30 pulls the clamping frame 31 downward, so that the end of the clamping frame 31 extends into the first clamping hole 32, thereby limiting the rotation of the support base 12, so that the two support platforms 13 are fixed to the front side of the lower support frame 9;

[0064] The second spring 29 is pressed against the support frame 31 to release the second spring 29, and the second spring 29 is pressed against the support frame 31 to release the second spring 29.

[0065] In addition, regarding the fixation of the workpiece on the support platform, the following structure is preferably provided:

[0066] The two support platforms 13 are both slidably connected to the clamping plates 35, and the bottoms of the two support platforms 13 are both rotatably connected to the second screw rods 36, and the two second screw rods 36 are respectively screwed and penetrate the two clamping plates 35;

[0067] The spiral directions of the two second screw rods 36 are the same, and one end of the two second screw rods 36 is fixedly connected to two baffles 39, a ratchet 38 is slidably connected between each group of two baffles 39, and a fourth spring 37 is fixedly connected between the ratchet 38 and one of the baffles 39, one end of the two ratchet wheels 38 is provided with a tooth groove of a right-angled triangle structure, and the tooth groove ends of the two ratchet wheels 38 are inserted and matched with each other.

[0068] As can be seen from the above, when the two support platforms 13 are fixed to the front side of the lower support frame 9, the tooth groove ends of the two ratchet wheels 38 are inserted into each other, such as Fig.15As shown, it is preferably set that when the left second screw rod 36 rotates backward, the left clamping plate 35 moves toward the middle. According to the same spiral direction of the two second screw rods 36, it is known that when the right second screw rod 36 rotates forward, the right clamping plate 35 moves toward the middle. At this time, the hypotenuses of the right-angled triangle tooth grooves of the two ratchet wheels 38 conflict with each other, so that the two ratchet wheels 38 rotate with each other and move to both sides along the second screw rod 36. At the same time, the two ratchet wheels 38 compress the fourth spring 37, so that the two clamping plates 35 can be moved toward the middle by individual adjustment, so as to clamp the workpiece, and the operation of the welding point not being located in the middle of the workpiece can be performed, and the welding point can be prevented from shifting during the welding operation;

[0069] On the contrary, when the second screw rod 36 on the left side rotates forward, the right-angled sides of the right-angled triangular tooth grooves of the two ratchet wheels 38 collide with each other, so that the two ratchet wheels 38 rotate synchronously, thereby causing the two second screw rods 36 to rotate synchronously, and then causing the two clamping plates 35 to move to the left at the same time, thereby driving the workpiece clamped between the two clamping plates 35 to move; similarly, when the second screw rod 36 on the right side rotates backward, the two clamping plates 35 drive the workpiece to move synchronously to the right, thereby facilitating multiple spot welding operations on the same workpiece without adjusting the clamping plates 35 one by one, thereby improving efficiency.

[0070] Preferably, a water inlet cavity and a water outlet cavity are provided in the electrode gripper 7, and a water inlet and a water outlet are provided on one side of the water inlet cavity and the water outlet cavity, respectively. A connecting pipe 40 is connected between the water inlet cavity and the water outlet cavity, and one end of the connecting pipe 40 extending into the water outlet cavity extends to an end away from the water outlet. Based on this, during the welding operation, the electrode gripper 7 and the electrode 8 will heat up, so that cooling water is introduced into the water inlet cavity through the water inlet, and the cooling water flows into the water outlet cavity through the connecting pipe 40, and one end of the connecting pipe 40 extending into the water outlet cavity extends to a position away from the water outlet, thereby extending the moving distance of the cooling water, so that the cooling water can achieve circulating cooling, while improving the cooling effect and cooling efficiency, thereby increasing the service life of the electrode gripper.

[0071] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fixed spot welding machine based on servo control, characterized in that: The invention comprises a base (1), and an upper support frame (2) and a lower support frame (9) fixed to one side of the base (1) from top to bottom in sequence, the upper support frame (2) having a sliding cylinder (4) slidably connected to the bottom, the sliding cylinder (4) and the lower support frame (9) both having fixed frames (5) fixed thereon, the two fixed frames (5) both having electrode arms (6) fixed therein, the two electrode arms (6) both having clamping mechanisms provided therein, the two clamping mechanisms both having electrode gripping rods (7) clamped therein, the two electrode gripping rods (7) both having electrodes (8) fixed thereon at one end thereof, and the two electrodes (8) being arranged opposite to each other; The clamping mechanism comprises a fixed ring (24) fixed in the electrode arm (6) and a plurality of third guide rods (25) fixedly mounted on the fixed ring (24); a sliding ring (20) is slidably connected between the plurality of third guide rods (25); a plurality of clamping rods (23) arranged in a circumferential array are rotatably connected to both the fixed ring (24) and the sliding ring (20); two groups of clamping rods (23) are located between the fixed ring (24) and the sliding ring (20); the outer sides of the plurality of clamping rods (23) connected to the fixed ring (24) are in sliding contact with the inner side of the sliding ring (20); and the outer sides of the plurality of clamping rods (23) connected to the sliding ring (20) are in sliding contact with the inner side of the fixed ring (24).

2. A servo-controlled fixed spot welding machine according to claim 1, characterized in that: The electrode arm (6) is rotatably connected to a spiral sleeve (18), the spiral sleeve (18) is screwed inside to a movable frame (19), and one end of the movable frame (19) is fixedly connected to a sliding ring (20).

3. A servo-controlled fixed spot welding machine according to claim 2, characterized in that: The clamping rod (23) is an L-shaped structure. A reset frame (22) is slidably connected between the fixed ring (24) and the sliding ring (20) and the corresponding clamping rod (23). A fixed plate (21) that contacts one end of the clamping rod (23) is fixed on the two reset frames (22). A plurality of second springs (26) are respectively fixedly connected between the two reset frames (22) and the adjacent fixed rings (24) and the sliding ring (20), and the plurality of second springs (26) are respectively sleeved on the outside of a plurality of third guide rods (25).

4. A servo-controlled fixed spot welding machine according to claim 1, characterized in that: A servo motor (3) is fixedly mounted on the upper support frame (2); a first screw rod (16) is fixedly connected to an output end of the servo motor (3); the slide cylinder (4) is screwedly connected to the first screw rod (16); a second guide rod (17) is fixedly mounted on one side of the slide cylinder (4); one end of the second guide rod (17) slides and extends into the upper support frame (2).

5. A servo-controlled fixed spot welding machine according to claim 1, characterized in that: The lower support frame (9) is symmetrically rotatably connected to two support bases (12) on both sides, and a plurality of first guide rods (10) are slidably connected to the two support bases (12). A support platform (13) is fixedly installed on the top of the two groups of the first guide rods (10). The outer sides of the two groups of the first guide rods (10) are sleeved with first springs (11), and the two ends of the plurality of first springs (11) are respectively fixedly connected to the corresponding support platform (13) and the support base (12). The bottoms of the two support platforms (13) are fixedly installed with screws (14) at one end of which slides through the support base (12). Nuts (15) are screwed and connected to the two screws (14), and the two nuts (15) are respectively located below the two support bases (12).

6. A servo-controlled fixed spot welding machine according to claim 5, characterized in that: The support base (12) is provided with a first clamping hole (32) and a second clamping hole (33), and the first clamping hole (32) and the second clamping hole (33) are respectively located on both sides of the rotation axis of the support base (12); the lower support frame (9) is slidably connected with two clamping frames (31) respectively slidably matched with the first clamping hole (32) and the second clamping hole (33); one end of the two clamping frames (31) is provided with an inclined surface that contacts the support base (12).

7. A servo-controlled fixed spot welding machine according to claim 6, characterized in that: A slide frame (34) is slidably disposed inside the lower support frame (9), and a connecting rod (30) is rotatably connected between the slide frame (34) and the two clamping frames (31). One end of the slide frame (34) is fixedly connected to a slide rod (28) that slides out of the lower support frame (9), and one end of the slide rod (28) is fixedly mounted with a pull rod (27). A third spring (29) is sleeved on the outer side of the slide rod (28), and the third spring (29) is located between the slide frame (34) and the lower support frame (9).

8. A servo-controlled fixed spot welding machine according to claim 5, characterized in that: The two support platforms (13) are both slidably connected to a clamping plate (35), and the bottoms of the two support platforms (13) are both rotatably connected to a second screw rod (36), and the two second screw rods (36) are respectively screwed and penetrate the two clamping plates (35).

9. A servo-controlled fixed spot welding machine according to claim 8, characterized in that: The spiral directions of the two second screw rods (36) are the same, one end of the two second screw rods (36) is fixedly connected to two baffles (39), a ratchet (38) is slidably connected between each group of two baffles (39), and a fourth spring (37) is fixedly connected between the ratchet (38) and one of the baffles (39), one end of the two ratchet wheels (38) is provided with a tooth groove of a right-angled triangle structure, and the tooth groove ends of the two ratchet wheels (38) are inserted into and matched with each other.

10. A servo-controlled fixed spot welding machine according to claim 1, characterized in that: A water inlet cavity and a water outlet cavity are provided in the electrode gripping rod (7), and a water inlet and a water outlet are provided on one side of the water inlet cavity and the water outlet cavity, respectively. A connecting pipe (40) is connected between the water inlet cavity and the water outlet cavity, and one end of the connecting pipe (40) extends into the water outlet cavity to an end away from the water outlet.

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