CN218555899U - Adjustable spot welding mechanism - Google Patents

Abstract

The utility model relates to an adjustable spot welding mechanism, which comprises a welding bracket, a welding plate arranged on the welding bracket in a swinging way, an adjusting mechanism for adjusting the swinging amplitude of the welding plate, a welding rod sliding along the welding bracket, a welding head for welding products and a clamp for clamping products; the adjusting mechanism is obliquely arranged on the welding bracket in an angle and rolls one side of the welding plate; the welding rod is movably connected with the other side of the welding plate; the welding head is arranged on the welding rod; the product is placed on the jig. The problem of adopt artifical handheld spot welding grab handle's mode among the current scheme, lead to welding precision low, the pushing down force during welding simultaneously is uncontrollable, the time bonding tool can harm the chip when welding is solved.

Description

Adjustable spot welding mechanism

Technical Field

The utility model relates to a welding equipment field especially relates to a spot welding mechanism with adjustable.

Background

With the continuous development of society, the machining field is developed more and more. With the rapid development of science and technology, the electronic industry tends to tiny integrated electronic components, and the requirement on the pressure precision of a micro spot welder is higher and higher. The spot welding head is a device used in a resistance welding apparatus to directly contact an object to be welded to directly supply current and pressure to the object to be welded.

At present, when a chip of the smoke alarm is processed, the chip needs to be processed by spot welding. Because smoke alarm's chip is higher to the requirement of spot welding, the tradition adopts the mode of artifical handheld spot welding grab handle, leads to welding precision low, and the holding down force during welding simultaneously is uncontrollable, and the time bonding tool can damage the chip when welding. How to solve this problem becomes crucial.

Disclosure of Invention

To the shortcoming of above-mentioned prior art, the utility model aims at providing a spot welding mechanism with adjustable to solve the mode that adopts artifical handheld spot welding grab handle among the prior art, lead to welding precision low, the pushing down force uncontrollable when welding simultaneously, the problem of chip can be harmd to the time bonding tool when welding.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

an adjustable spot welding mechanism;

the welding device comprises a welding bracket, a welding plate arranged on the welding bracket in a swinging mode, an adjusting mechanism for adjusting the swinging amplitude of the welding plate, a welding rod sliding along the welding bracket, a welding head for welding a product and a clamp for clamping the product; the adjusting mechanism is obliquely arranged on the welding bracket at an angle and rolls one side of the welding plate; the welding rod is movably connected with the other side of the welding plate; the welding head is arranged on the welding rod; the product is placed on the jig.

The further technical scheme is as follows: an adjusting frame is arranged in the welding support in a swinging mode; the adjusting mechanism is rotatably arranged on the adjusting frame; an adjusting block is arranged in the welding bracket; an adjusting shaft is arranged on the adjusting block; the adjusting shaft penetrates through the adjusting frame.

The further technical scheme is as follows: the adjusting frame is in threaded connection with a first locking piece; a first elastic device is hung on the welding bracket; the first resilient means creates a force that pulls the first locking member.

The further technical scheme is as follows: the adjusting mechanism comprises an adjusting rod rotatably arranged on the adjusting frame, an adjusting piece in threaded connection with the adjusting rod and a first roller rotatably arranged on the adjusting piece; the first roller rolls along one side of the welding plate.

The further technical scheme is as follows: the welding rod is rotatably provided with a second roller; an opening is formed in the other side of the welding plate; the second roller rolls along the opening.

The further technical scheme is as follows: a bracket is arranged on the welding rod; a third roller is rotatably arranged on the bracket; the welding bracket is provided with a guide rod along the sliding direction of the welding rod; the third roller rolls along the guide rod.

The further technical scheme is as follows: the device also comprises a supporting mechanism for supporting the welding plate in a rolling manner; the supporting mechanism comprises a supporting frame arranged on the welding bracket in a swinging mode, a fourth roller for supporting the welding plate in a rolling mode and a supporting wheel arranged on the welding bracket in an eccentric rotating mode; the support frame extends towards the direction close to the welding plate to form a first extending part; the support frame extends to the direction far away from the welding plate to form a second extending part; the fourth roller is rotatably arranged on the first extending part; the support wheel contacts the second extension.

The further technical scheme is as follows: the supporting mechanism further comprises a sliding piece arranged on the welding bracket in a sliding mode and a detection device for detecting the sliding displacement of the sliding piece; the sliding piece is movably connected with the second extending part; the detection end of the detection device faces the sliding piece.

The further technical scheme is as follows: the welding head comprises a connecting sheet, a first welding block, a second welding block oppositely arranged on the welding rod, a welding pin for welding a product, a second locking piece for connecting the adjacent second welding blocks and a second elastic device for elastically supporting the adjacent second welding blocks; the connecting sheet is respectively connected with the first welding block and the second welding block; the welding pin is arranged on the first welding block; the second elastic device is sleeved on the second locking piece.

The further technical scheme is as follows: the clamp comprises a base, a clamping block for placing a product, a chuck for clamping the product, a movable seat arranged on the base in a sliding manner and a micro-cylinder for pushing the movable seat; the clamping block is arranged on the chuck; the micro-drum is arranged on the base.

Compared with the prior art, the utility model discloses a beneficial technological effect as follows: (1) The adjusting mechanism is screwed, so that the front end of the adjusting mechanism rolls along the front end of the welding plate, the swing amplitude of the welding plate is adjusted, the welding plate drives the welding rod and the welding head to move up and down, the height adjustment of the welding head is completed, and the height adjustment of the welding head can be completed only by screwing the adjusting mechanism in a small range by utilizing the swing arrangement of the welding plate and utilizing the lever principle, so that the spot welding efficiency is improved; (2) The adjusting mechanism is obliquely arranged on the welding bracket at an angle, the welding plate can drive the adjusting mechanism to move when swinging, the adjusting mechanism can move smoothly by swinging the adjusting bracket around the outer surface of the adjusting shaft, and the first elastic device forms a force for pulling the adjusting bracket to be tensioned by screwing the first locking piece, so that the vibration generated during spot welding on the welding bracket, the adjusting bracket and the adjusting mechanism is eliminated; (3) The adjusting rod is rotated to enable the adjusting piece to move back and forth, the first roller wheel rolls back and forth along the front end of the welding plate, the welding plate swings up and down, the welding plate drives the welding rod and the welding head to move up and down, the bracket and the third roller wheel are driven to move up and down in the moving process of the welding rod, the third roller wheel rolls up and down along the guide rod, the welding head can move up and down stably by rotating the adjusting rod, the welding precision of the welding head is improved, when the welding plate swings, the second roller wheel rolls in the opening, the welding plate and the welding rod can be movably connected smoothly, interference between the welding plate and the welding rod is avoided, and the welding head can move up and down smoothly; (4) When the welding head welds a product, the welding pin contacts the product, the first welding block is connected with the second welding block through the connecting sheet, soft connection between the first welding block and the second welding block is realized, after the welding pin contacts the product, the welding pin is prevented from damaging the product, the welding quality of the welding head is ensured, and the second elastic device forms elastic supporting force which pushes the adjacent second welding block outwards through screwing the second locking piece, so that the shaking of the welding head in the welding process is eliminated; (5) The product is placed on the product, the chuck clamps the product, the micro-drum is screwed, the pushing end of the micro-drum pushes the movable seat to slide along the front and back direction of the base, the front and back direction movement of the product is completed, the fine adjustment of the position of the product is completed, the welding head can accurately weld the product, and the welding precision of the product is improved; (6) Rotating the supporting wheel, wherein the supporting wheel realizes eccentric rotation, contacts the second extending part, pushes the supporting frame to swing through the supporting wheel, drives the fourth roller to move up and down through the supporting frame, and adjusts the swing height of the welding plate through adjusting the fourth roller, so as to adjust the welding height of the welding head; (7) When the supporting frame swings, the supporting frame drives the sliding piece to slide back and forth, the detection device detects the sliding displacement of the sliding piece, the swing height of the welding plate can be known, and the supporting wheel can be rotated conveniently.

Drawings

Fig. 1 shows a schematic structural diagram of an adjustable spot welding mechanism according to a first embodiment of the present invention.

Fig. 2 shows a right side structural view of the adjustable spot welding mechanism according to the first embodiment of the present invention.

Fig. 3 shows a right side view of a first embodiment of the welding head of the present invention.

Fig. 4 shows a right view structural diagram of an adjustable spot welding mechanism according to a second embodiment of the present invention.

Fig. 5 is a right structural view of a support mechanism according to a second embodiment of the present invention.

In the drawings, the reference numbers: 1. welding a bracket; 11. an adjusting frame; 12. an adjusting block; 13. an adjustment shaft; 14. a first locking member; 15. a first elastic device; 2. welding the plate; 21. an opening; 3. an adjustment mechanism; 31. an adjusting lever; 32. an adjustment member; 33. a first roller; 4. welding a rod; 41. a second roller; 42. a support; 43. a third roller; 44. a guide bar; 5. a welding head; 51. a first solder bump; 52. a second solder bump; 53. welding pins; 54. a second locking member; 55. a second elastic device; 56. connecting sheets; 6. a clamp; 61. a clamping block; 62. a chuck; 63. a base; 64. a movable seat; 65. a micro-drum; 7. a support mechanism; 71. a support frame; 72. a fourth roller; 73. a support wheel; 74. a first extension portion; 75. a second extension portion; 76. a slider; 77. and (4) a detection device.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the following device of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. To make the objects, features and advantages of the present invention more comprehensible, please refer to the attached drawings. It should be understood that the structure, proportion, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used for limiting the limitation of the implementation of the present invention, so that the present invention does not have the essential technical meaning, and any modification of the structure, change of the proportion relation or adjustment of the size should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function and the achievable purpose of the present invention.

The first embodiment:

fig. 1 shows a schematic structural diagram of an adjustable spot welding mechanism according to a first embodiment of the present invention. Fig. 2 shows a right view structural diagram of the adjustable spot welding mechanism according to the first embodiment of the present invention. Fig. 3 shows a right side view of a welding head according to a first embodiment of the present invention. With reference to fig. 1, 2 and 3, the present invention discloses an adjustable spot welding mechanism. The direction of X in the figure is the upper end of the structure schematic diagram of the utility model, and the direction of Y in the figure is the front end of the structure schematic diagram of the utility model.

The adjustable spot welding mechanism comprises a welding support 1, a welding plate 2 arranged on the welding support 1 in a swinging mode, an adjusting mechanism 3 for adjusting the swinging amplitude of the welding plate 2, a welding rod 4 sliding along the welding support 1, a welding head 5 for welding products and a clamp 6 for clamping the products. The adjusting mechanism 3 is obliquely arranged on the welding bracket 1 at an angle and is rolled on one side of the welding plate 2. The welding rod 4 is movably connected with the other side of the welding plate 2. The welding head 5 is arranged on the welding rod 4. The product is placed on a jig 6.

The welding plate 2 is arranged on the welding bracket 1 in a swinging way in the front-back direction. The middle position of the welding plate 2 is connected with the welding bracket 1 in a swinging way. The adjusting mechanism 3 is arranged on the welding bracket 1 in the front-back direction. The front end of the adjusting mechanism 3 is inclined downward. The rear end of the adjusting mechanism 3 is inclined upward. The adjusting mechanism 3 rolls the front end of the welded plate 2. The welding rod 4 is arranged on the welding bracket 1 in a vertical sliding manner. The upper end of the welding rod 4 is movably connected with the rear end of the welding plate 2. A welding head 5 is arranged at the lower end of the welding rod 4. The clamp 6 is located below the welding head 5.

The distance from the swing position of the welding plate 2 to the front end of the welding plate 2 is less than the distance from the swing position of the welding plate 2 to the rear end of the welding plate 2.

Through twisting guiding mechanism 3 for guiding mechanism 3's front end rolls along the front end of welded plate 2, adjusts the amplitude of oscillation of welded plate 2, makes welded plate 2 drive welding rod 4 and bonding tool 5 reciprocate, accomplishes the altitude mixture control of bonding tool 5. Through the swing setting of welded plate 2, utilize the principle of lever for only need the small-range adjusting mechanism 3 of twisting to accomplish the height position control of bonding tool 5, improved the efficiency of spot welding.

An adjusting frame 11 is arranged in the welding bracket 1 in a swinging way. The adjusting mechanism 3 is rotatably provided on the adjusting bracket 11. An adjusting block 12 is arranged in the welding bracket 1. The adjusting block 12 is provided with an adjusting shaft 13. The adjusting shaft 13 penetrates the adjusting bracket 11.

The adjusting bracket 11 is arranged at the rear end in the welding bracket 1 in a swinging way. The adjusting mechanism 3 is rotatably provided on the adjusting bracket 11 in the front-rear direction. The adjusting block 12 is arranged in the welding bracket 1 in the vertical direction. The adjusting shaft 13 is provided at the lower end of the adjusting block 12 in the left-right direction. The left end of the adjusting shaft 13 is connected with the lower end of the adjusting block 12. The adjusting shaft 13 penetrates the adjusting frame 11 in the left-right direction. The adjustment frame 11 swings around the outer surface of the adjustment shaft 13.

The adjustment frame 11 is screwed with a first locking member 14. The first elastic device 15 is hung on the welding bracket 1. The first elastic means 15 create a force pulling the first locking member 14.

The first locking member 14 is screwed up and down to the adjustment frame 11. Preferably, the first elastic means 15 is a spring. The upper end of the first elastic means 15 is hung on the lower end of the first locking member 14. The lower end of the first elastic device 15 is hung on the welding bracket 1.

By turning the first locking member 14, the first locking member 14 pulls the first elastic means 15 so that the first elastic means 15 is in a tensioned state.

The adjusting mechanism 3 is obliquely arranged on the welding bracket 1 at an angle, and the welding plate 2 can drive the adjusting mechanism 3 to move when swinging. The adjusting mechanism 3 can move smoothly by the adjusting bracket 11 swinging around the outer surface of the adjusting shaft 13. By screwing the first locking member 14 so that the first elastic means 15 forms a tension force pulling the adjustment frame 11, vibrations occurring during spot welding on the welding carriage 1, the adjustment frame 11 and the adjustment mechanism 3 are eliminated.

The adjusting mechanism 3 includes an adjusting lever 31 rotatably provided on the adjusting bracket 11, an adjusting member 32 screwed to the adjusting lever 31, and a first roller 33 rotatably provided on the adjusting member 32. The first roller 33 rolls along the side of the welding plate 2.

The adjusting lever 31 is rotatably provided in the adjusting frame 11 in the front-rear direction. The adjuster 32 is screwed to the front end of the adjuster rod 31. The first rollers 33 are rotatably provided at left and right sides of the lower end of the setting member 32.

A second roller 41 is rotatably provided on the welding rod 4. The other side of the welding plate 2 is provided with an opening 21. The second roller 41 rolls along the inside of the opening 21.

The second roller 41 is rotatably provided at the upper end of the welding rod 4. An opening 21 is opened at the rear end of the weld plate 2. The second roller 41 is disposed in the opening 21. When the welding plate 2 swings, the second roller 41 rolls along the inside of the opening 21.

The welding rod 4 is provided with a bracket 42. A third roller 43 is rotatably provided on the bracket 42. The welding stent 1 is provided with a guide bar 44 along the sliding direction of the welding rod 4. The third roller 43 rolls along the guide bar 44.

The bracket 42 is provided on the welding rod 4 in the front-rear direction. The third roller 43 is rotatably provided at the front end of the bracket 42. The third roller 43 rolls up and down along the guide bar 44.

The adjusting lever 31 is rotated to move the adjusting member 32 forward and backward, and the first roller 33 rolls forward and backward along the front end of the welding plate 2. The welding plate 2 swings up and down, the welding plate 2 drives the welding rod 4 and the welding head 5 to move up and down, the welding rod 4 drives the support 42 and the third roller 43 to move up and down in the moving process, the third roller 43 rolls up and down along the guide rod 44, the welding head 5 can be moved up and down by the rotating adjusting rod 31, the third roller 43 rolls up and down along the guide rod 44, the welding head 5 can stably move up and down, and the welding precision of the welding head 5 is improved. When the welding plate 2 swings, the second idler wheel 41 rolls along the opening 21, so that the welding plate 2 and the welding rod 4 can be smoothly movably connected, the interference between the welding plate 2 and the welding rod 4 is avoided, and the welding head 5 is guaranteed to smoothly move up and down.

The welding head 5 comprises a connecting piece 56, a first welding block 51, a second welding block 52 oppositely arranged on the welding rod 4, a welding pin 53 for welding products, a second locking piece 54 for connecting the adjacent second welding blocks 52 and a second elastic device 55 for elastically supporting the adjacent second welding blocks 52. The connecting pieces 56 connect the first solder bumps 51 and the second solder bumps 52, respectively. The welding pins 53 are provided on the first solder bumps 51. The second elastic device 55 is sleeved on the second locking member 54.

The second welding blocks 52 are oppositely disposed at the left and right sides of the lower end of the welding rod 4. A welding pin 53 is provided at the rear end of the first solder bump 51. The connecting piece 56 is arranged in a horizontal direction. The rear end of the connecting piece 56 is connected to the front end of the first solder bump 51. The front end of the connecting piece 56 is connected to the rear end of the second solder bump 52. Preferably, the second locking member 54 is a bolt. The second locking member 54 is screwed to the adjacent second welding block 52 in the left-right direction. The second elastic means 55 is disposed between the adjacent second pads 52 in the left-right direction. The second elastic device 55 is sleeved on the second locking member 54 in the left-right direction. The second locking member 54 is tightened, the second locking member 54 pushes the adjacent second welding blocks 52 toward each other, and the second resilient means 55 resiliently supports the adjacent second welding blocks 52. The first solder bump 51 is connected to a power source through a copper sheet.

When the welding head 5 welds a product, the welding needle 53 contacts the product, the first welding block 51 is connected with the second welding block 52 through the connecting sheet 56, the flexible connection between the first welding block 51 and the second welding block 52 is realized, and after the welding needle 53 contacts the product, the welding needle 53 is prevented from damaging the product, and the welding quality of the welding head 5 is ensured. By tightening the second locking member 54 so that the second resilient means 55 forms a resilient supporting force urging the adjacent second pad 52 outwardly, the rattling of the welding head 5 during the welding process is eliminated.

The jig 6 includes a base 63, a clamp block 61 for placing a product, a chuck 62 for holding the product, a movable seat 64 slidably provided on the base 63, and a micro-drum 65 for pushing the movable seat 64. The clamp block 61 is provided on the chuck 62. The micro-drum 65 is provided on the base 63.

The base 63 is disposed in a horizontal direction. The movable seat 64 slides in the front-rear direction of the base 63. The micro-drum 65 is provided on the base 63 in the front-rear direction. The chuck 62 is disposed at an upper end of the movable seat 64. The clamp block 61 is disposed at an intermediate position of an upper end of the chuck 62. The pushing end of micro-drum 65 is rotatably connected with movable seat 64.

Place the product on the product, chuck 62 holds the product, twists micro-section of thick bamboo 65, and micro-section of thick bamboo 65's promotion end promotes sliding seat 64 and slides along base 63 fore-and-aft direction, accomplishes the fore-and-aft direction removal of product, accomplishes the fine setting of product position for bonding tool 5 can accurately weld the product, has improved the welding precision of product.

Second embodiment:

fig. 4 shows a right view structural diagram of an adjustable spot welding mechanism according to a second embodiment of the present invention. Fig. 5 is a right structural view of a support mechanism according to a second embodiment of the present invention. As shown in fig. 1, fig. 2, fig. 3, fig. 4, and fig. 5, the second embodiment is different from the first embodiment in that:

the adjustable spot welding mechanism further comprises a support mechanism 7 for rolling the support weld plate 2. The supporting mechanism 7 comprises a supporting frame 71 arranged on the welding bracket 1 in a swinging mode, a fourth roller 72 for supporting the welding plate 2 in a rolling mode and a supporting wheel 73 arranged on the welding bracket 1 in an eccentric rotating mode. The support bracket 71 extends toward the welding plate 2 to form a first extension 74. The supporting frame 71 extends away from the welding plate 2 to form a second extending portion 75. The fourth roller 72 is rotatably disposed on the first extension 74. The support wheels 73 contact the second extension 75.

The first extension 74 is provided at the upper end of the support bracket 71, and the first extension 74 extends rearward. The second extension portion 75 is provided at a lower end of the support bracket 71, and the second extension portion 75 extends downward. The fourth roller 72 is rotatably provided at the rear end of the first extension 74. The support wheel 73 is eccentrically and rotatably provided on the welding bracket 1 in the right-left direction.

Rotating the supporting wheel 73, enabling the supporting wheel 73 to rotate eccentrically, enabling the supporting wheel 73 to contact with the second extending portion 75, pushing the supporting frame 71 to swing through the supporting wheel 73, enabling the supporting frame 71 to drive the fourth roller 72 to move up and down, and adjusting the swing height of the welding plate 2 through adjusting the fourth roller 72 so as to adjust the welding height of the welding head 5.

The support mechanism 7 further includes a slider 76 slidably provided on the welding bracket 1 and a detection device 77 that detects the amount of slide displacement of the slider 76. The slide 76 is movably connected to the second extension 75. The detection end of the detection device 77 faces the slider 76.

The slider 76 is slidably provided on the welding bracket 1 in the front-rear direction. The rear end of the sliding member 76 is movably connected to the second extending portion 75. Preferably, the detection device 77 is an infrared sensor.

When the supporting frame 71 swings, the supporting frame 71 drives the sliding member 76 to slide back and forth, and the detection device 77 detects the sliding displacement of the sliding member 76, so that the swinging height of the welding plate 2 can be known, and the supporting wheel 73 can be conveniently rotated.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent several embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. An adjustable spot welding mechanism is characterized in that: the welding device comprises a welding support (1), a welding plate (2) arranged on the welding support (1) in a swinging mode, an adjusting mechanism (3) for adjusting the swinging amplitude of the welding plate (2), a welding rod (4) sliding along the welding support (1), a welding head (5) of a welding product and a clamp (6) for clamping the product; the adjusting mechanism (3) is obliquely arranged on the welding bracket (1) in an angle manner and rolls one side of the welding plate (2); the welding rod (4) is movably connected with the other side of the welding plate (2); the welding head (5) is arranged on the welding rod (4); the product is placed on the jig (6).

2. An adjustable spot welding mechanism as defined in claim 1 wherein: an adjusting frame (11) is arranged in the welding bracket (1) in a swinging manner; the adjusting mechanism (3) is rotatably arranged on the adjusting frame (11); an adjusting block (12) is arranged in the welding support (1); an adjusting shaft (13) is arranged on the adjusting block (12); the adjusting shaft (13) penetrates through the adjusting frame (11).

3. An adjustable spot welding mechanism as defined in claim 2 wherein: a first locking piece (14) is connected to the adjusting frame (11) in a threaded manner; a first elastic device (15) is hung on the welding bracket (1); the first elastic means (15) create a force pulling the first locking member (14).

4. An adjustable spot welding mechanism as defined in claim 1 wherein: the adjusting mechanism (3) comprises an adjusting rod (31) rotatably arranged on the adjusting frame (11), an adjusting piece (32) in threaded connection with the adjusting rod (31), and a first roller (33) rotatably arranged on the adjusting piece (32); the first roller (33) rolls along one side of the welding plate (2).

5. An adjustable spot welding mechanism as defined in claim 1 wherein: a second roller (41) is rotatably arranged on the welding rod (4); an opening (21) is formed in the other side of the welding plate (2); the second roller (41) rolls along the inside of the opening (21).

6. An adjustable spot welding mechanism as defined in claim 1 wherein: a bracket (42) is arranged on the welding rod (4); a third roller (43) is rotatably arranged on the bracket (42); the welding support (1) is provided with a guide rod (44) along the sliding direction of the welding rod (4); the third roller (43) rolls along the guide bar (44).

7. An adjustable spot welding mechanism as defined in claim 1 wherein: the welding device also comprises a supporting mechanism (7) for supporting the welding plate (2) in a rolling manner; the supporting mechanism (7) comprises a supporting frame (71) which is arranged on the welding bracket (1) in a swinging mode, a fourth roller (72) which supports the welding plate (2) in a rolling mode and a supporting wheel (73) which is arranged on the welding bracket (1) in an eccentric rotating mode; the supporting frame (71) extends towards the direction close to the welding plate (2) to form a first extending part (74); the supporting frame (71) extends to a direction far away from the welding plate (2) to form a second extending part (75); the fourth roller (72) is rotatably arranged on the first extension part (74); the support wheel (73) contacts the second extension (75).

8. An adjustable spot welding mechanism as defined in claim 7 wherein: the supporting mechanism (7) further comprises a sliding part (76) arranged on the welding bracket (1) in a sliding mode and a detection device (77) for detecting the sliding displacement of the sliding part (76); the sliding part (76) is movably connected with the second extending part (75); the detection end of the detection device (77) faces the sliding piece (76).

9. An adjustable spot welding mechanism as defined in claim 1 wherein: the welding head (5) comprises a connecting piece (56), a first welding block (51), a second welding block (52) oppositely arranged on the welding rod (4), a welding needle (53) for welding products, a second locking piece (54) for connecting the adjacent second welding blocks (52) and a second elastic device (55) for elastically supporting the adjacent second welding blocks (52); the connecting piece (56) is respectively connected with the first welding block (51) and the second welding block (52); the welding pin (53) is arranged on the first welding block (51); the second elastic device (55) is sleeved on the second locking piece (54).

10. An adjustable spot welding mechanism as defined in claim 1 wherein: the clamp (6) comprises a base (63), a clamping block (61) for placing a product, a chuck (62) for clamping the product, a movable seat (64) arranged on the base (63) in a sliding manner and a micro-drum (65) for pushing the movable seat (64); the clamping block (61) is arranged on the chuck (62); the micro-drum (65) is arranged on the base (63).

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