Single-sided double-point double-station welding machine

Abstract

The application discloses a single-face double-point double-station welding machine, which comprises a rack, the front and rear parts of the top surface of the top plate of the rack are fixed with transverse guide rails, a plurality of front-and-rear extending positioning rods are installed on the two transverse guide rails, the front and rear bottom surfaces of the positioning rods are fixed with sliding blocks, the sliding blocks are inserted into the corresponding transverse guide rails, two door plates to be processed are placed on the top plate of the rack between the two transverse guide rails, the left door plate is between the two positioning rods on the left part, and the right door plate is between the two positioning rods on the right part; the welding machine can clamp and position the two door plates and then automatically weld, the welding machine moves by using a moving mechanism and does not need to use a robot, the manufacturing cost of the welding machine is low, the welding position can be irradiated by light of a laser measuring pen, the height of the welding position can be detected at any time, the welding effect can be known, and the welding quality can be ensured.

Description

Technical fields:

[0001] This invention relates to the field of welding equipment technology, and more specifically to a single-sided, double-point, double-station welding machine. Background technology:

[0002] Existing large door panels require welding multiple grooved tubes, such as Figure 1 As shown, the existing method is to manually place the grooved tube on the door panel and then manually weld it to the door panel. This method is inefficient and has poor results. Moreover, during the welding process, the lack of a clamping mechanism makes it easy to move, resulting in unsatisfactory results.

[0003] A Chinese patent application (202020542449.1) describes a dual-robot door panel welding device. This device uses two robots for welding, but the robots are expensive, and the door panel... Figure 1 The structures shown are not the same and cannot be used interchangeably. There is no corresponding clamping mechanism, and the state after welding cannot be immediately known. Summary of the Invention:

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a single-sided, double-point, double-station welding machine. It can clamp and position two door panels and then perform automatic welding. It uses a moving mechanism for movement, eliminating the need for a robot. It has low manufacturing costs, and it can use a laser measuring pen to illuminate the welding position to continuously detect the height of the welding point, understand the welding effect, and ensure welding quality.

[0005] The solution of the present invention to the aforementioned technical problem is:

[0006] A single-sided double-point double-station welding machine includes a frame. The top surface of the top plate of the frame is fixed with transverse guide rails at the front and rear. Multiple positioning rods extending forward and backward are installed on the two transverse guide rails. Sliding blocks are fixed on the bottom surface of the front and rear of the positioning rods. The sliding blocks are inserted into the corresponding transverse guide rails. Two door panels to be processed are placed on the top plate of the frame between the two transverse guide rails. The door panel on the left is located between the two positioning rods on the left, and the door panel on the right is located between the two positioning rods on the right.

[0007] An upper frame is fixed above the top plate of the machine frame. A moving mechanism is fixed to the bottom surface of the top plate of the upper frame. A welding support frame is fixed to the bottom of the moving plate of the moving mechanism. Two lifting cylinders are fixed to the top surface of the bottom plate of the welding support frame. The bottom end of the push rod of the lifting cylinder extends out of the bottom surface of the bottom plate of the welding support frame and is fixed to a lifting plate. An extension rod is installed on the bottom surface of the lifting plate, and a welding electrode is fixed to the bottom end of the extension rod, with the welding electrode facing the door panel.

[0008] Side clamping blocks are fixed on the front and rear inner walls of the opposite sides of the two corresponding positioning rods, with the front wall of the rear side clamping block in close contact with the rear wall of the corresponding door panel.

[0009] The rear wall of the front side clamping block is formed with a telescopic hole. The front end face of the telescopic hole is formed with a rearwardly extending insertion hole. The front wall face of the insertion hole is formed with a rearwardly extending through hole. The locking screw is inserted into the telescopic hole, the insertion hole, and the through hole. The rear end of the locking screw is fixed or formed with a clamping head. The clamping head is inserted into the telescopic hole. The rear end of the clamping head extends out of the rear end face of the telescopic hole and presses against the front wall face of the corresponding door panel. The rear end of the locking screw extends out of the front end of the through hole and is screwed with two mutually pressing locking nuts. The rear end face of the rear locking nut presses against the front wall face of the corresponding side clamping block. The buffer spring is inserted into the insertion hole. The front end of the buffer spring is applied to the rear end face of the insertion hole. The front end of the buffer spring is inserted into the telescopic hole and presses against the rear end face of the clamping head.

[0010] Multiple connecting seats are fixed to the inner side of one of the two corresponding positioning rods. Multiple buffer through holes are formed on the vertical plate of the connecting seat. The horizontal support rod is inserted into the corresponding buffer through hole. The end of the horizontal support rod extends out of the outer wall of the vertical plate of the connecting seat and is formed with a radial extension edge. The radial extension edge presses against the outer wall of the vertical plate. The other ends of the two horizontal support rods extend out of the other end of the buffer through hole and are fixed to the same side top plate. A side buffer spring is inserted into the horizontal support rod. One end of the side buffer spring is applied to the inner wall of the corresponding side top plate, and the other end of the side buffer spring is applied to the vertical plate. The side top plate faces the corresponding side wall of the door panel, and the other side wall of the door panel faces the inner side wall of the other positioning rod.

[0011] The top surface of the lifting plate is fixed with multiple vertical guide rods, which are inserted into vertical through holes formed on the bottom plate of the welded support frame.

[0012] The bottom surface of the lifting plate is fixed with a connecting seat plate formed at the top of the extension rod. An adjustment frame is fixed on the outer side wall of the extension rod. The end of the lateral extension arm of the adjustment frame is movably connected to a rotating block through a connecting shaft. A laser measuring pen is fixed on the rotating block, and the laser of the laser measuring pen shines onto the door panel.

[0013] The end of the lateral extension arm of the adjustment frame is formed with a slot, and a protrusion is formed on one side wall of the rotating block. The protrusion is inserted into the slot, the middle part of the connecting shaft is inserted into the slot and is located in the middle through hole of the protrusion, and the two ends of the connecting shaft are locked in the positioning holes formed on the two side walls of the slot.

[0014] A toothed ring is fixed on the outer wall of the middle part of the connecting shaft. A threaded through hole is formed on one side wall of the middle through hole. A ball plunger is threaded into the threaded through hole. The steel ball of the ball plunger extends into the middle through hole and is nested in one of the tooth grooves of the outer tooth part of the toothed ring.

[0015] The rotating block has a hole formed in the middle, and an anti-slip elastic sleeve is fixed on the inner wall of the hole. The laser measuring pen is inserted into the hole, and its outer wall is pressed against the inner wall of the protective elastic sleeve.

[0016] The outstanding effects of this invention are:

[0017] It can clamp and position two door panels for automatic welding. It uses a moving mechanism for movement, eliminating the need for robots. This reduces manufacturing costs. Furthermore, it can use a laser measuring pen to illuminate the welding position, constantly monitoring the height of the weld to understand the welding effect and ensure welding quality. Attached image description:

[0018] Figure 1 This is a partial structural schematic diagram of the door panel to be processed according to the present invention;

[0019] Figure 2 This is a partial structural schematic diagram of the present invention;

[0020] Figure 3 This is a partial front view of the present invention;

[0021] Figure 4 This is a partial cross-sectional view of the present invention;

[0022] Figure 5 This is a partial cross-sectional view from another direction of the present invention;

[0023] Figure 6 This is a partial structural diagram of the lifting plate of the present invention;

[0024] Figure 7 yes Figure 6 A schematic diagram of the local structure from a different angle;

[0025] Figure 8 This is a schematic diagram of a partial structure at the rotating block;

[0026] Figure 9 This is a partial structural diagram of the side clamping block;

[0027] Figure 10 This is a partial structural diagram of the connector.

[0028] Figure 11 yes Figure 2 A magnified view of a portion of the image. Detailed implementation method:

[0029] For example, see below. Figures 1 to 11 As shown, a single-sided, double-point, double-station welding machine includes a frame 10. The top surface of the frame 10 has transverse guide rails 11 fixed at both the front and rear. Multiple forward- and backward-extending positioning rods 12 are mounted on the two transverse guide rails 11. Sliding blocks 13 are fixed to the front and rear bottom surfaces of the positioning rods 12, and the sliding blocks 13 are inserted into the corresponding transverse guide rails 11. Two door panels 100 to be processed are placed on the top surface of the frame 10 between the two transverse guide rails 11. The left door panel 100 is positioned between the two left positioning rods 12, and the right door panel 100 is positioned between the two right positioning rods 12. Between them, the front and rear parts of the positioning rod 12 are formed with vertical screw holes. After the positioning rod 12 is adjusted, the locking bolt (not shown in the figure) is screwed into the vertical screw hole. The bottom end of the screw of the locking bolt extends out of the bottom surface of the positioning rod 12 and presses against the top surface of the top plate of the frame 10, thereby lifting the positioning rod 12. The cross section of the transverse guide rail 11 is also I-shaped. The sliding groove of the sliding block 13 cooperates with the transverse guide rail 11, so that the bottom edge of the sliding groove of the sliding block 13 is close to the top surface of the transverse guide groove on both the front and rear sides of the transverse guide rail 11, thereby achieving clamping and fixing, and fixing the positioning rod 12.

[0030] An upper frame 20 is fixed above the top plate of the frame 10, and a moving mechanism 30 is fixed on the bottom surface of the top plate of the upper frame 20.

[0031] The moving mechanism 30 includes connecting plates fixed to the left and right sides of the bottom surface of the top plate of the upper frame 20. A transverse moving screw is movably connected to the two connecting plates through bearings. A connecting plate is fixed to the bottom left side of the top plate of the upper frame 20. A transverse moving motor is fixed to the outer wall of the connecting plate. The end of the output shaft of the transverse moving motor extends out of the inner wall of the connecting plate and is connected to the left end of the transverse moving screw through a coupling. A transverse moving block is screwed onto the transverse moving screw. A connecting beam extending forward and backward is fixed to the bottom surface of the transverse moving block. A guide rail extending left and right is fixed to the bottom surface of the top plate of the upper frame 20. An upper sliding block is fixed to the top surface of the connecting beam. The upper sliding block is inserted into the corresponding guide rail.

[0032] The connecting beam has fixed plates at the front and rear of its bottom surface. The front and rear extending screws are movably connected to the fixed plates via bearings. A motor fixing plate is fixed on one side of the connecting beam. The front and rear moving motor is fixed on the motor fixing plate. The end of the output shaft of the front and rear moving motor extends out of the motor fixing plate and is connected to one end of the screw via a coupling. A moving connecting block is fixed on the top surface of the moving plate 31 and screwed onto the screw. Multiple upper sliding blocks are fixed on the top surface of the moving plate 31. Multiple front and rear extending guide rails are fixed on the bottom surface of the connecting beam. The upper sliding blocks are inserted into the corresponding guide rails.

[0033] A welding support frame 40 is fixed to the bottom of the movable plate 31. Two lifting cylinders 41 are fixed to the top surface of the bottom plate of the welding support frame 40. The bottom end of the push rod of the lifting cylinder 41 extends out of the bottom surface of the bottom plate of the welding support frame 40 and is fixed to a lifting plate 42. An extension rod 43 is installed on the bottom surface of the lifting plate 42. A welding electrode 44 is fixed to the bottom end of the extension rod 43. The welding electrode 44 faces the door panel 100.

[0034] Furthermore, side clamping blocks 14 are fixed on the front and rear inner walls of the opposing surfaces of the two corresponding positioning rods 12. The front wall of the rear side clamping block 14 is in close contact with the rear wall of the corresponding door panel 100. The rear end of the pressing head 141 installed on the front side clamping block 14 extends out of the rear wall of the front side clamping block 14 and presses against the front wall of the corresponding door panel 100. Specifically, a telescopic hole is formed on the rear wall of the front side clamping block 14. A rearwardly extending insertion hole is formed in the middle of the front end face of the telescopic hole. A rearwardly extending through hole is formed in the middle of the front wall of the insertion hole. A locking screw 142 is inserted into the telescopic hole, the insertion hole, and the through hole. A pressing head 141 is fixed or formed on the rear end of the locking screw 142. The pressing head 141 is inserted into the telescopic hole. The rear end of the pressing head 141 extends out of the rear end face of the telescopic hole and presses against the front wall of the door panel 100. The locking screw 142, with its rear end extending through the through hole and screwed onto the front wall of the corresponding door panel 100, has two locking nuts that press against each other. The rear end face of the locking nut presses against the front wall of the corresponding side clamping block 14. The buffer spring 143 is inserted into the insertion hole, with its front end bearing against the rear end face of the insertion hole. The front end of the buffer spring 143 is also inserted into the telescopic hole and presses against the rear end face of the pressing head 141. Through the buffer spring 143, the pressing head 141 achieves elastic pressing against the front wall of the door panel 100.

[0035] Furthermore, one of the two corresponding positioning rods 12 has multiple connecting seats 15 fixed to its inner side. Multiple buffer through holes are formed on the vertical plate portion of the connecting seat 15. A transverse support rod 151 is inserted into the corresponding buffer through hole. The end of the transverse support rod 151 extends out of the outer wall surface of the vertical plate portion of the connecting seat 15 and has a radially extending edge formed thereon. The radially extending edge presses against the outer wall surface of the vertical plate portion. The other ends of the two transverse support rods 151 extend out of the other ends of the buffer through holes. The same side top plate 152 is fixed, and a side buffer spring 153 is inserted into the horizontal support rod 151. One end of the side buffer spring 153 is applied to the inner wall surface of the corresponding side top plate 152, and the other end of the side buffer spring 153 is applied to the vertical plate. The side top plate 152 faces the corresponding side wall of the door panel 100. When adjusting the position, the side top plate 152 is elastically pressed against the corresponding side wall of the corresponding door panel 100. The other side wall of the door panel 100 faces the inner side wall of another positioning rod 12.

[0036] Furthermore, the top surface of the lifting plate 42 is fixed with a plurality of vertical guide rods 421. The vertical guide rods 421 are inserted into vertical through holes formed on the bottom plate of the welded support frame 40. Guide sleeves are fixed on the inner side wall of the vertical through holes, and the vertical guide rods 421 are inserted into the corresponding guide sleeves.

[0037] Furthermore, the bottom surface of the lifting plate 42 is fixed with a connecting seat plate formed on the top of the extension rod 43. An adjustment frame 50 is fixed on the outer side wall of the extension rod 43. The adjustment frame 50 includes a main connecting block. A central through hole is formed in the middle of the main connecting block. An outwardly extending locking groove is formed on one side of the central through hole. A transverse extension arm 51 is formed on one side of the outer side wall of the main connecting block. Outwardly extending connecting through holes are formed on both sides of the locking groove. The extension rod 43 is inserted into the central through hole. The two sides of the locking groove of the main connecting block are connected close to each other by fixing bolts and fixing lock nuts, so that the extension rod 43 is pressed against the inner side wall of the central through hole to achieve locking and fixing.

[0038] The end of the lateral extension arm 51 is movably connected to a rotating block 60 via a connecting shaft. A laser measuring pen 70 is fixed on the rotating block 60, and the laser from the laser measuring pen 70 irradiates the door panel 100.

[0039] Furthermore, the end of the lateral extension arm 51 of the adjustment frame 50 is formed with a groove 52, and a protrusion 61 is formed on one side wall of the rotating block 60. The protrusion 61 is inserted into the groove 52, the middle part of the connecting shaft is inserted into the groove 52 and is located in the middle through hole 62 of the protrusion 61, and both ends of the connecting shaft are engaged in the positioning holes formed on the two side walls of the groove 52.

[0040] A toothed ring 63 is fixed on the outer wall of the middle part of the connecting shaft. A threaded through hole 62 is formed on one side wall of the middle part. A ball plunger 64 is screwed into the threaded through hole. The steel ball of the ball plunger 64 extends into the middle part through hole 62. The steel ball is nested in one of the tooth grooves of the outer tooth part of the toothed ring 63.

[0041] Furthermore, the rotating block 60 has a socket formed in the middle, and an anti-slip elastic sleeve is fixed on the inner wall of the socket. The laser measuring pen 70 is inserted into the socket, and its outer wall is pressed against the inner wall of the protective elastic sleeve.

[0042] Furthermore, the front wall of the upper frame 20 is formed with two operating channels. Safety light curtain devices 1 are fixed on the left and right sides of the operating channels respectively. The light emitter of the safety light curtain device 1 is fixed on one side wall of the operating channel, and the light receiver of the safety light curtain device 1 is fixed on the other side wall of the operating channel. The light emitter illuminates the light receiver.

[0043] In this embodiment, two door panels 100 are placed on the top surface of the top plate of the frame 10, with each door panel 100 positioned between two positioning rods 12. Then, the positioning rods 12 are moved so that the front wall of the rear side clamping block 14 is pressed against the rear wall of the corresponding door panel 100, the inner side wall of one positioning rod 12 is pressed against one side wall of the door panel 100, and the side wall of the side top plate 152 is pressed against the other side wall of the corresponding door panel 100. At the same time, the rear end of the pressing head 141 extends out of the rear end face of the telescopic hole and presses against the front of the corresponding door panel 100. On the front wall of the side panel, the door body 100 is clamped and fixed. Then, the locking bolt is screwed into the corresponding vertical screw hole of the positioning rod 12. The bottom end of the screw of the locking bolt extends out of the bottom surface of the positioning rod 12 and presses against the top surface of the top plate of the frame 10, thereby lifting the positioning rod 12. The cross section of the transverse guide rail 11 is also I-shaped. The sliding groove of the sliding block 13 cooperates with the transverse guide rail 11, so that the bottom edge of the sliding groove of the sliding block 13 is close to the top surface of the transverse guide groove on both the front and rear sides of the transverse guide rail 11, thereby achieving clamping and fixing, and fixing the positioning rod 12.

[0044] Then, the grooved tube to be welded is placed at the corresponding position on the top surface of the corresponding door panel 100, with the bottom of the grooved tube inserted into the corresponding groove. Then, the moving mechanism 30 is operated to move the welding electrode 44 back and forth and left and right to the position to be welded. The push rod of the lifting cylinder 41 is pushed to press the welding electrode 44 against the position to be welded. In this way, all the connections between the grooved tube and the door panel 100 are welded. After the welding is completed, all parts are returned to their original positions, and the welded door panel 100 can be taken out, which is very convenient.

[0045] In this embodiment, all electrical components, electronic control components, and pneumatic components (air pump, control valve, and air supply device consisting of a connecting pipe connected to the lifting cylinder 41, thereby driving the extension and retraction of the push rod of the lifting cylinder 41) are electrically connected to the control host via electrical connection lines. They are all conventional structures and will not be described in detail.

[0046] When in use, its safety light curtain device 1 can detect whether someone passes through the operating channel and enters the top of the frame 10. When an object passes through the operating channel, part of the light from its light emitter is blocked, which will prevent the light receiver from receiving the light source, thereby transmitting the sensing signal to the control host, and the control host will control the corresponding equipment to stop running.

[0047] During the welding process, the rotating block 60 needs to be rotated beforehand so that the laser of the laser measuring pen 70 irradiates the bottom of the welding electrode 44 at the welding point of the door panel 100. It can constantly sense the measurement distance of the welding electrode 44 after welding on the top surface of the door panel 100. By changing the distance (when not welding, the distance of the laser of the laser measuring pen 70 irradiating the top surface of the door panel 100 is long, and after welding, the distance of the laser of the laser measuring pen 70 irradiating the top surface of the welding point is short, the height after welding can be obtained by the distance difference, so the height after welding can be detected at all times. The laser measuring pen 70 is a laser distance sensor, which is a conventional structure and will not be described in detail here). When the height detected by it reaches the specified requirement, the welding electrode 44 is stopped by the control host. It can also control the push rod of the lifting cylinder 41 to retract by the control host to complete the welding (in the attached figure, the laser of the laser measuring pen 70 does not irradiate the top surface of the welding point).

[0048] In this embodiment, when the rotating block 60 rotates, the steel ball of the ball-head plunger 64 extends into the central through hole 62. The steel ball is nested in one of the tooth grooves of the outer tooth of the toothed ring 63 to achieve positioning, ensuring that the laser irradiation position of the laser measuring pen 70 is accurate and not easily shaken, thus ensuring the accurate position of the laser measuring pen 70 and good effect.

Claims

1. A single-sided, double-point, dual-station welding machine, comprising a frame (10), characterized in that: The top surface of the top plate of the frame (10) is fixed with transverse guide rails (11) at the front and rear. Multiple positioning rods (12) extending forward and backward are installed on the two transverse guide rails (11). Sliding blocks (13) are fixed on the bottom surface of the front and rear of the positioning rods (12). The sliding blocks (13) are inserted into the corresponding transverse guide rails (11). Two door panels (100) to be processed are placed on the top plate of the frame (10) between the two transverse guide rails (11). The door panel (100) on the left is between the two positioning rods (12) on the left, and the door panel (100) on the right is between the two positioning rods (12) on the right. The top plate of the frame (10) is fixed with an upper frame (20), and a moving mechanism (30) is fixed on the bottom surface of the top plate of the upper frame (20). The bottom of the moving plate (31) of the moving mechanism (30) is fixed with a welding support frame (40). The top surface of the bottom plate of the welding support frame (40) is fixed with two lifting cylinders (41). The bottom end of the push rod of the lifting cylinder (41) extends out of the bottom surface of the bottom plate of the welding support frame (40) and is fixed with a lifting plate (42). An extension rod (43) is installed on the bottom surface of the lifting plate (42). A welding electrode (44) is fixed at the bottom end of the extension rod (43). The welding electrode (44) faces the door panel (100). Side clamping blocks (14) are fixed on the front and rear inner sidewalls of the opposite walls of the two corresponding positioning rods (12). The front wall of the rear side clamping block (14) is in close contact with the rear wall of the corresponding door panel (100). The rear end of the pressing head (141) installed on the front side clamping block (14) extends out of the rear wall of the front side clamping block (14) and presses against the front wall of the corresponding door panel (100). The rear wall of the front side clamping block (14) is formed with a telescopic hole, and the front end face of the telescopic hole is formed with a rearwardly extending insertion hole. The front wall face of the insertion hole is formed with a rearwardly extending through hole. The locking screw (142) is inserted into the telescopic hole, the insertion hole and the through hole. The rear end of the locking screw (142) is fixed or formed with a clamping head (141). The clamping head (141) is inserted into the telescopic hole. The rear end of the clamping head (141) extends out of the rear end face of the telescopic hole and presses against the opposite side. On the front wall of the front side panel of the corresponding door panel (100), the rear end of the locking screw (142) extends out of the front end of the through hole and is screwed with two locking nuts that press against each other. The rear end face of the locking nut presses against the front wall of the corresponding side clamping block (14). The buffer spring (143) is inserted into the insertion hole. The front end of the buffer spring (143) is applied to the rear end face of the insertion hole. The front end of the buffer spring (143) is inserted into the telescopic hole and presses against the rear end face of the pressing head (141). The bottom surface of the lifting plate (42) is fixed with a connecting seat plate formed at the top of the extension rod (43). An adjustment frame (50) is fixed on the outer side wall of the extension rod (43). The end of the lateral extension arm (51) of the adjustment frame (50) is movably connected to a rotating block (60) through a connecting shaft. A laser measuring pen (70) is fixed on the rotating block (60). The laser of the laser measuring pen (70) irradiates the door panel (100). Multiple connecting seats (15) are fixed to the inner side of one of the two corresponding positioning rods (12). Multiple buffer through holes are formed on the vertical plate of the connecting seat (15). The transverse support rod (151) is inserted into the corresponding buffer through hole. The end of the transverse support rod (151) extends out of the outer wall of the vertical plate of the connecting seat (15) and is formed with a radial extension edge. The radial extension edge presses against the outer wall of the vertical plate. The other two transverse support rods (151) are fixed to the inner side of the connecting seat (15). One end extends out of the other end of the buffer through hole and is fixed to the same side top plate (152). A side buffer spring (153) is inserted into the horizontal support rod (151). One end of the side buffer spring (153) is applied to the inner wall surface of the corresponding side top plate (152), and the other end of the side buffer spring (153) is applied to the vertical plate. The side top plate (152) faces the corresponding side wall of the door panel (100), and the other side wall of the door panel (100) faces the inner side wall of another positioning rod (12). The rotating block (60) has a hole formed in the middle, and an anti-slip elastic sleeve is fixed on the inner wall of the hole. The laser measuring pen (70) is inserted into the hole, and its outer wall is pressed against the inner wall of the protective elastic sleeve. During the welding process, the rotating block (60) needs to be rotated first so that the laser of the laser measuring pen (70) irradiates the bottom of the welding electrode (44) to the welding point of the door panel (100). It can sense the measurement distance of the welding electrode (44) after welding on the top surface of the door panel (100) at all times. When not welding, the distance of the laser of the laser measuring pen (70) to the top surface of the door panel (100) is long. After welding, the distance of the laser of the laser measuring pen (70) to the top surface of the welding point is short. The height after welding can be obtained by the distance difference, so the height after welding can be detected at all times. When the height detected reaches the specified requirements, the welding electrode (44) is stopped by controlling the host.

2. The single-sided double-point double-station welding machine according to claim 1, characterized in that: The top surface of the lifting plate (42) is fixed with multiple vertical guide rods (421), which are inserted into vertical through holes formed on the bottom plate of the welded support frame (40).

3. The single-sided double-point double-station welding machine according to claim 1, characterized in that: The end of the lateral extension arm (51) of the adjustment frame (50) is formed with a slot (52), and a protrusion (61) is formed on one side wall of the rotating block (60). The protrusion (61) is inserted into the slot (52), the middle part of the connecting shaft is inserted into the slot (52) and is located in the middle through hole (62) of the protrusion (61). The two ends of the connecting shaft are locked in the positioning holes formed on the two side walls of the slot (52). A toothed ring (63) is fixed on the outer wall of the middle part of the connecting shaft. A threaded through hole (62) is formed on one side wall of the middle part. A ball plunger (64) is threaded into the threaded through hole. The steel ball of the ball plunger (64) extends into the middle part through hole (62). The steel ball is nested in one of the tooth grooves of the outer tooth part of the toothed ring (63).

4. A single-sided, double-point, dual-station welding machine according to claim 1, characterized in that: The front wall of the upper frame (20) is formed with two operating channels. Safety light curtain devices (1) are fixed on the left and right sides of the operating channels respectively. The light emitter of the safety light curtain device (1) is fixed on one side wall of the operating channel, and the light receiver of the safety light curtain device (1) is fixed on the other side wall of the operating channel. The light emitter illuminates the light receiver.

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