A cold welding device for multi-layer composite silver contacts

Abstract

The present invention relates to the technical field of cold welding equipment, and in particular to a cold welding equipment for multi-layer composite silver contacts, comprising: a frame; a limit module, wherein the limit module is fixedly arranged on the frame, the limit module is provided with a limit seat capable of limiting and fixing a workpiece, and the limit seat is also provided with a limit groove for loading the workpiece; a guide module is fixedly arranged on the frame in a vertical state; the guide module is provided with a guide frame capable of positioning and guiding the silver contact and a first linear driver capable of driving the guide frame longitudinally close to or away from the limit module; the cold welding module is fixedly arranged on the frame in a vertical state and is located above the guide module; the cold welding module is provided with a cold welding head capable of moving along the guiding direction of the guide frame and capable of cold welding the silver contact to the workpiece; the present invention can not only actively suppress the deformation of the silver contact when welding the silver contact, but also can always maintain a uniform pressure to weld the silver contact.

Description

Technical Field

[0001] The invention relates to the technical field of cold welding equipment, in particular to a cold welding equipment for multi-layer composite silver contacts. Background Art

[0002] In electrical equipment, silver contacts are widely used in contact elements of various electrical switches and relays because of their high conductivity, strong anti-oxidation ability, and excellent corrosion resistance. However, single-layer silver contacts are susceptible to wear and arc erosion after long-term use, resulting in a decrease in performance. In order to improve the wear resistance of silver contacts and extend their service life, multi-layer composite silver contacts have gradually become the research focus and application trend of the industry.

[0003] In the welding process of multi-layer composite silver contacts, cold welding equipment is mainly used to directly weld the silver contacts to the surface of the workpiece by low-temperature plastic deformation. Silver contacts are widely used in electrical components such as relays and contactors due to their excellent conductivity and corrosion resistance. However, when welding between silver contacts and workpieces, existing cold welding equipment often only directly applies pressure through a single linear drive method, which easily causes uneven plastic deformation of the silver contacts, resulting in uneven welding surfaces, thereby affecting the contact reliability and conductivity of welding; such as a silver contact automatic welding machine applied by Chinese patent application number: CN110480113A, which uses a simple automatic positioning and a welding method of directly applying pressure to the silver contacts to weld the silver contacts, and can only perform simple welding operations; it is difficult to achieve precise control of pressure and stroke when welding multi-layer composite silver contacts, which can easily cause the silver contacts to be over-pressurized or not welded in place.

[0004] In addition, the silver contacts need to be positioned with high precision during welding to ensure good conductive contact between each layer of silver contacts and the workpiece. However, the positioning method of existing cold welding equipment is often relatively simple, and it is impossible to avoid the slight displacement of the silver contacts during welding, which affects the welding accuracy. Summary of the invention

[0005] In view of the above problems, a cold welding device for multi-layer composite silver contacts is provided. By proposing a welding device that can not only assist in positioning the silver contacts during cold welding but also always maintain a uniform welding pressure, the technical problems of uneven welding surface caused by uneven plastic deformation of the silver contacts and inadequate welding caused by excessive pressure on the silver contacts when welding the silver contacts with existing welding equipment are solved.

[0006] To solve the problems of the prior art, the present invention provides a cold welding device for multi-layer composite silver contacts, which is used for welding the silver contacts to a workpiece, and comprises: a frame; a limiting module, wherein the limiting module is fixedly arranged on the frame, the limiting module is provided with a limiting seat capable of limiting and fixing the workpiece, and the limiting seat is also provided with a limiting groove for loading the workpiece; a guiding module is fixedly arranged on the frame in a vertical state and is located above the limiting module, the guiding module is provided with a guiding frame capable of positioning and guiding the silver contacts, and a first linear driver capable of driving the guiding frame to longitudinally approach or move away from the limiting module; the guiding end of the guiding frame is arranged opposite to the limiting groove; when the silver contact is placed in the guiding frame, the silver contact will fall into the limiting groove at a fixed point in a guiding state; the cold welding module is fixedly arranged on the frame in a vertical state and is located above the guiding module; the cold welding module is provided with a cold welding head capable of moving along the guiding direction of the guiding frame and capable of cold welding the silver contact to the workpiece.

[0007] Preferably, the guiding module also includes a first supporting frame, a connecting frame and a mounting frame; the guiding frame is detachably arranged in the mounting frame; two groups of the first linear drives are arranged, and the two groups of first linear drives are symmetrically arranged on the frame in a vertical state through the first supporting frame; the mounting frame is horizontally arranged between the two groups of first linear drives and is fixedly connected to the driving ends of the two groups of first linear drives through the connecting frame; the mounting frame is a hollow rectangular warehouse structure with openings at both ends; correction rods are also vertically arranged at the four corners of the top of the mounting frame.

[0008] Preferably, the guide frame is composed of a mounting plate and a guide portion vertically arranged below the mounting plate; the mounting plate and the mounting frame are abutted and matched; the guide portion has a first guide channel running from top to bottom, and the first guide channel is used to guide the silver contacts to move along a fixed path.

[0009] Preferably, the guiding module further comprises an electromagnetic heating element and a heating ring; the electromagnetic heating element is embedded in the inner wall of the mounting frame and arranged close to the bottom of the mounting frame; the heating ring is embedded in the outer wall of the guiding frame and arranged close to the bottom of the guiding frame.

[0010] Preferably, the limit module also includes a slide rail and a sliding platform; two slide rails are provided, and the two slide rails are symmetrically arranged on the frame along the long side direction of the frame; the sliding platform is horizontally spanned on the two slide rails and slidably cooperates with the slide rails; the sliding platform is also fixedly provided with a driving handle that can drive the sliding platform to slide and switch between the loading station and the welding station, and a locking member that can lock the sliding platform to the welding station.

[0011] Preferably, the limiting module further includes a limiting plate capable of positioning the sliding platform at the welding station; the limiting plate is fixedly disposed on the frame in a vertical state and is disposed between the two slide rails.

[0012] Preferably, the cold welding module also includes a second support frame, a second linear drive and a fixed-distance conduction unit; the second linear drive is fixedly arranged on the frame in a vertical state through the second support frame and is located above the guide module; the cold welding head is fixedly connected to the driving end of the second linear drive through the fixed-distance conduction unit; the fixed-distance conduction unit is provided with a conduction member that can automatically disconnect from the output end of the second linear drive after moving to a preset stroke; the cold welding head is detachably arranged at the lower end of the conduction member.

[0013] Preferably, the fixed-distance transmission unit also includes an outer guide cylinder, a guide screw, an inner guide cylinder and an elastic separation element; the outer guide cylinder is movably mounted on the second support frame through the guide screw, and is coaxially arranged with the output end of the second linear drive; the outer guide cylinder has a second guide channel that runs through from top to bottom, and the inner wall of the second guide channel is also radially provided with a release groove; the outer side of the guide screw is also threaded with an adjusting nut for limiting and adjusting the position of the outer guide cylinder; the inner guide cylinder is clamped with the connecting end of the transmission member through an elastic separation element embedded in its side wall; the transmission member is coaxially slidably arranged in the inner guide cylinder, and the top of the inner guide cylinder is fixedly connected to the output end of the second linear drive.

[0014] Preferably, the inner guide cylinder consists of an upper cylinder part and a lower cylinder part which are coaxially arranged and fixedly connected end to end; the diameter of the lower cylinder part is larger than that of the upper cylinder part; the inner wall of the lower cylinder part is also radially provided with a rectangular through hole and a partition is fixedly provided in the rectangular through hole; the elastic separation element is movably arranged in the rectangular through hole.

[0015] Preferably, the elastic separation element includes a movable rod, a limiting portion, a roller, a spring and a flange; the movable rod is slidably set in the rectangular through hole through the limiting portion fixed at the front end, and the movable rod passes through the partition and slidably cooperates with the partition; the roller is rotatably set at the rear end of the movable rod relative to the limiting portion; the flange is coaxially fixed outside the movable rod and is arranged close to the limiting portion; the spring is coaxially sleeved and installed outside the movable rod, one end of the spring abuts against the partition, and the other end of the spring abuts against the flange; the movable rod is always moved radially toward the outer guide cylinder under the elastic support of the spring.

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

[0017] 1. The present invention realizes how to accurately position the silver contact on the welding point of the workpiece through the cooperation of the guide module and the limit module, effectively avoiding the precision error caused by plastic deformation or displacement of the silver contact during the welding process, and improving the cold welding quality.

[0018] 2. The present invention realizes how to automatically disconnect the second linear drive output end according to a preset stroke during the process of applying pressure to the silver contact through a fixed-distance conduction unit, thereby avoiding excessive pressure on the silver contact by the cold welding head and effectively preventing technical problems such as structural damage and surface unevenness of the silver contact; it realizes precise control of the pressure and stroke in the cold welding process, ensuring the uniformity and consistency of each welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A perspective view of a cold welding device for multi-layer composite silver contacts.

[0020] Figure 2 A side view of a cold welding device for multi-layer composite silver contacts.

[0021] Figure 3 It is a cross-sectional view taken along the line AA in FIG. 2 .

[0022] Figure 4 yes Figure 3 A partial enlarged view of point B.

[0023] Figure 5 yes Figure 3 A partial enlarged view of point C.

[0024] Figure 6 A top view of a cold welding device for multi-layer composite silver contacts.

[0025] Figure 7 yes Figure 6 A three-dimensional cross-sectional view of the section at DD.

[0026] Figure 8 yes Figure 7 A partial enlarged view of point E.

[0027] Fig. 9 The present invention is a three-dimensional exploded view of the structure of a cold welding device for multi-layer composite silver contacts without the frame and cold welding module.

[0028] Fig.10 The present invention is a three-dimensional diagram of the partial structure of a cold welding module in a cold welding device for multi-layer composite silver contacts.

[0029] The numbers in the figure are:

[0030] 1- rack;

[0031] 2-limiting module; 21-limiting seat; 22-limiting slot; 23-slide rail; 24-sliding platform; 241-driving handle; 242-locking member; 25-limiting plate;

[0032] 3-guiding module; 31-guiding frame; 311-carrying plate; 312-guiding part; 313-first guiding channel; 314-circular through hole; 315-bolt; 32-first linear drive; 33-first supporting frame; 34-connecting frame; 35-mounting frame; 36-correction rod; 37-electromagnetic heating element; 38-heating ring; 39-guide rod;

[0033] 4-cold welding module; 41-cold welding head; 42-second support frame; 43-second linear drive; 44-fixed distance conduction unit; 441-conducting member; 442-outer guide cylinder; 4421-release groove; 4422-second guide channel; 443-guide screw; 444-adjusting nut; 445-inner guide cylinder; 4451-upper cylinder; 4452-lower cylinder; 4453-rectangular through hole; 4454-partition; 446-elastic separation element; 4461-movable rod; 4462-limiting part; 4463-roller; 4464-spring; 4465-flange. DETAILED DESCRIPTION

[0034] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0035] See also Figures 1 to 10 As shown: A cold welding device for multi-layer composite silver contacts, used for welding the silver contacts to the workpiece, comprising: a frame 1; a limit module 2, the limit module 2 is fixedly arranged on the frame 1, the limit module 2 is provided with a limit seat 21 capable of limiting and fixing the workpiece, and the limit seat 21 is also provided with a limit groove 22 for loading the workpiece; a guide module 3 is fixedly arranged on the frame 1 in a vertical state and is located above the limit module 2, the guide module 3 is provided with a guide frame 3 capable of positioning and guiding the silver contacts 1 and a first linear driver 32 capable of driving the guide frame 31 to longitudinally approach or move away from the limiting module 2; the guiding end of the guide frame 31 is arranged opposite to the limiting groove 22; when the silver contact to be welded is placed in the guide frame 31, the silver contact will fall into the limiting groove 22; the cold welding module 4 is fixedly arranged on the frame 1 in a vertical state and is located above the guide module 3; the cold welding module 4 is provided with a cold welding head 41 capable of moving along the guiding direction of the guide frame 31 and capable of cold welding the silver contact to the workpiece.

[0036] When the workpiece is to be welded with silver contacts, the workpiece to be welded is first placed on the limit module 2 of the loading station, so that it is embedded in the limit groove 22 provided in the limit seat 21 to ensure that the workpiece and the limit groove 22 are strictly aligned; after the workpiece is accurately placed, the limit module 2 is moved and adjusted to the welding station, i.e., directly below the guide module 3. The staff then takes out the silver contact and puts it into the guide frame 31. Through the limit guidance of the guide frame 31, the silver contact can automatically fall into the welding point of the workpiece, so as to achieve the precise correspondence between the contact and the position of the workpiece to be welded. Then, the cold welding module 4 is started, and the output shaft of the cold welding module 4 is extended, driving the cold welding head 41 to perform the cold welding operation on the silver contact and the workpiece under the auxiliary guidance of the guide frame 31.

[0037] During the welding process, the lower surface of the guide frame 31 abuts against the surface of the workpiece under the drive of the first linear drive 32, thereby limiting the freedom of the silver contact, ensuring that the contact is only deformed inside the guide frame 31, avoiding structural damage or surface unevenness caused by excessive plastic deformation, and thus ensuring the integrity of the welding surface. In addition, the limit design of the guide frame 31 effectively ensures that the silver contact maintains a specific position during welding, prevents displacement, and improves welding accuracy and stability; when the cold welding is completed, in order to ensure that the silver contact and the guide frame 31 can be effectively separated, at this time, it is only necessary to connect an external power supply to drive the first linear drive 32 to drive the guide frame 31 to move, so that the guide frame 31 is longitudinally away from the workpiece and the silver contact set on the workpiece for cold welding, so that the silver contact is separated from the guide frame 31, and finally the cold welding head 41 is driven longitudinally away from the silver contact.

[0038] The synergistic effect of the limiting module 2 and the guiding module 3 can not only accurately control the position and force of the silver contacts during the welding process, but also effectively reduce the quality problems caused by plastic deformation, thereby ensuring the integrity, accuracy and stability of the welding surface.

[0039] See also Figure 6 and Fig. 9 As shown: the guiding module 3 also includes a first supporting frame 33, a connecting frame 34 and a mounting frame 35; the guiding frame 31 is detachably arranged in the mounting frame 35; the first linear drive 32 is provided with two groups, and the two groups of first linear drives 32 are symmetrically arranged on the frame 1 in a vertical state through the first supporting frame 33; the mounting frame 35 is horizontally arranged between the two groups of first linear drives 32 and is fixedly connected to the driving ends of the two groups of first linear drives 32 through the connecting frame 34; the mounting frame 35 is a hollow rectangular warehouse structure with openings at both ends; correction rods 36 are also vertically arranged at the four corners of the top of the mounting frame 35.

[0040] A guide rod 39 is also vertically disposed on the connecting frame 34, and a rod portion of the guide rod 39 passes through the first supporting frame 33 and is slidably matched with the first supporting frame 33;

[0041] When it is necessary to drive the detachable guide frame 31 in the mounting frame 35 to longitudinally approach and abut against the upper surface of the workpiece on the limit module 2 at the welding station, firstly turn on the external power supply to activate the first linear drive 32. The output shaft of the first linear drive 32 extends longitudinally and drives the guide frame 31 to approach the workpiece until the lower surface of the guide frame 31 abuts against the upper surface of the workpiece and stops, thereby completing the longitudinal adjustment of the guide frame 31. The correction rods 36 vertically arranged at the four corners of the top of the mounting frame 35 are used to provide a quick correction and positioning function when installing the guide frame 31, so as to ensure the installation accuracy and stability of the guide frame 31.

[0042] The longitudinal drive of the first linear drive 32 is used to achieve the abutment between the guide frame 31 and the workpiece surface, ensuring that the guide frame 31 maintains a stable position during the welding operation and avoiding errors caused by improper contact; at the same time, the setting of the correction rod 36 makes the installation of the guide frame 31 convenient and fast, effectively improving the assembly accuracy and operating efficiency.

[0043] See also Fig. 9 As shown: the guide frame 31 is composed of a mounting plate 311 and a guide portion 312 vertically arranged below the mounting plate 311; the mounting plate 311 and the mounting frame 35 are in abutment with each other; the guide portion 312 has a first guide channel 313 running through from top to bottom, and the first guide channel 313 is used to guide the silver contacts to move along a fixed path.

[0044] The shape of the first guide channel 313 is the same as that of the silver contact, and its inner diameter is in clearance with the shape of the silver contact, so as to realize directional guidance of the silver contact, so that the silver contact can move in a fixed posture when passing through the first guide channel 313, and finally accurately transfer to the welding point of the workpiece. The surface of the mounting plate 311 is also provided with a plurality of circular through holes 314, and the positions of the circular through holes 314 correspond to the positions of the correction rods 36 on the mounting frame 35, so as to facilitate the positioning of the mounting plate 311 during the installation process; the surface of the mounting plate 311 is also provided with bolts 315 for locking. When a guide frame 31 of a different shape needs to be replaced, the old guide frame 31 is removed by loosening the locking bolts 315, and replaced with a new guide frame 31 adapted according to the structure of the silver contact, and then the bolts 315 are re-tightened to ensure the quick replacement and stable installation of the guide frame 31.

[0045] The silver contacts can be precisely oriented and conducted by the guide frame 31, which helps to improve the contact accuracy between the silver contacts and the welding points. The guide frames 31 of different specifications can be flexibly replaced by the correction and locking design of the mounting plate 311, so as to meet the welding requirements of silver contacts of different specifications.

[0046] See also Figure 7 As shown: the guiding module 3 also includes an electromagnetic heating element 37 and a heating ring 38; the electromagnetic heating element 37 is embedded in the inner wall of the mounting frame 35 and is arranged close to the bottom of the mounting frame 35; the heating ring 38 is embedded in the outer wall of the guiding frame 31 and is arranged close to the bottom of the guiding frame 31.

[0047] During the low-temperature cold welding process, when the silver contact and the workpiece are welded by the cold welding module 4, it is necessary to apply appropriate welding pressure to the silver contact to cause the silver contact to produce a certain deformation in the guide frame 31 and be embedded in the inner wall of the guide frame 31. To ensure that the silver contact can be smoothly separated from the guide frame 31 after the welding is completed, when the first linear drive 32 is operated to drive the guide frame 31 longitudinally away from the workpiece, the power is turned on to drive the electromagnetic heating element 37 and activate the heating ring 38. The inner wall of the guide frame 31 is heated by the heating ring 38, and the temperature difference is used to make the embedded silver contact expand and contract, thereby reducing the contact tightness between the silver contact and the inner wall of the guide frame 31, thereby achieving the smooth separation of the silver contact from the guide frame 31 and preventing the silver contact from remaining in the guide frame 31 due to deformation.

[0048] This design uses electromagnetic heating to disengage the inner wall of the guide frame 31 to ensure that the silver contacts can be quickly detached after cold welding. This not only improves the efficiency of smooth separation of the silver contacts, but also effectively reduces the impact of deformation, maintains welding accuracy and prevents structural damage to the silver contacts due to adhesion during the removal process.

[0049] See also Fig. 9 As shown: the limit module 2 also includes a slide rail 23 and a sliding platform 24; two slide rails 23 are provided, and the two slide rails 23 are symmetrically arranged on the frame 1 along the long side direction of the frame 1; the sliding platform 24 is horizontally spanned on the two slide rails 23 and slidably cooperates with the slide rails 23; the sliding platform 24 is also fixedly provided with a driving handle 241 that can drive the sliding platform 24 to slide and switch between the loading station and the welding station, and a locking member 242 that can lock the sliding platform 24 to the welding station.

[0050] The locking member 242 is specifically a locking bolt, which is used to lock the sliding platform 24 and the slide rail 23 located at the welding station, thereby ensuring that the workpiece can always maintain a fixed posture in the cold welding state.

[0051] The welding station is located at one end of the slide rail 23 close to the guide module 3 , that is, directly below the guide frame 31 ; the loading station is located at the other end away from the guide module 3 .

[0052] When it is necessary to load the workpiece, the staff first drives the locking member 242 to unlock the sliding platform 24 located at the welding station, and then grasps the driving handle 241 to pull the sliding platform 24 from the welding station to the loading station, and then takes the workpiece to be welded, and embeds the workpiece to be welded in the limiting groove 22 opened on the limiting seat 21. At this time, the workpiece is flush with the surface of the limiting seat 21; after the workpiece is placed, the staff pushes the limiting seat 21 with the workpiece installed to the welding station again and locks the limiting seat 21 at the welding station through the locking member 242.

[0053] See also Fig. 9 As shown, the limiting module 2 also includes a limiting plate 25 capable of positioning the sliding platform 24 located at the welding station; the limiting plate 25 is fixedly arranged on the frame 1 in a vertical state and is arranged between the two slide rails 23.

[0054] After placing the workpiece to be welded on the limit seat 21 located at the loading station, it is necessary to push the limit seat 21 with the workpiece installed to the welding station. In order to ensure that the sliding platform 24 displaced to the welding station is always in a fixed position, thereby ensuring the welding accuracy of each workpiece, in the process of pushing the sliding platform 24 toward the welding station, the sliding platform 24 stops after one end close to the limit frame abuts against the limit frame, thereby achieving the effect of automatically positioning the sliding platform 24 that slides to the welding station.

[0055] See also Figure 3 and Figure 5 As shown: the cold welding module 4 also includes a second support frame 42, a second linear drive 43 and a fixed-distance conduction unit 44; the second linear drive 43 is fixedly arranged on the frame 1 in a vertical state through the second support frame 42 and is located above the guide module 3; the cold welding head 41 is fixedly connected to the driving end of the second linear drive 43 through the fixed-distance conduction unit 44; the fixed-distance conduction unit 44 is provided with a conduction member 441 which can automatically disconnect from the output end of the second linear drive 43 after moving to a preset stroke; the cold welding head 41 is detachably arranged at the lower end of the conduction member 441.

[0056] The conductive member 441 is composed of a first rod and a second rod that are coaxially arranged and fixedly connected end to end; an annular groove is also formed on the outside of the first rod, and the annular groove is used to engage with the limiting portion 4462.

[0057] When it is necessary to drive the cold welding head 41 to longitudinally approach the silver contact and complete the cold welding between the silver contact and the workpiece, the second linear driver 43 is first driven to move, so that its output shaft extends to drive the fixed distance conduction unit 44 to move, and at the same time, the cold welding head 41 fixedly arranged at the output end of the fixed distance conduction unit 44 is driven to move toward the silver contact until the cold welding head 41 reaches the welding position and completes the cold welding process between the silver contact and the workpiece. Since the conductive member 441 arranged in the fixed distance conduction unit 44 can automatically disconnect from the output end of the second linear driver 43 after moving to a preset stroke, before cold welding, the disconnection stroke of the conductive member 441 can be adjusted to a set position, so that after the cold welding is completed, the cold welding head 41 can automatically cut off the connection with the second linear driver 43.

[0058] This design overcomes the problem of plastic deformation that is easily caused when the second linear drive 43 directly applies pressure to the traditional cold welding equipment, and avoids structural damage or surface unevenness of the silver contacts. The active disconnection function realized by the conductive part 441 can effectively prevent the pressure from exceeding the bearing range of the silver contacts and ensure the integrity of the contact shape. In addition, the design of the conductive part 441 automatically disconnecting after reaching the preset pressure and stroke ensures that the force and stroke of each pressure application remain consistent, thereby forming a stable and uniform welding effect between the silver contacts and the workpiece. Compared with the direct pressure method, this structure reduces the uneven pressure caused by mechanical errors or fluctuations, and effectively improves the welding quality and stability.

[0059] See also Fig.10 As shown: the fixed-distance transmission unit 44 also includes an outer guide cylinder 442, a guide screw 443, an inner guide cylinder 445 and an elastic separation element 446; the outer guide cylinder 442 is movably mounted on the second support frame 42 through the guide screw 443, and is coaxially arranged with the output end of the second linear drive 43; the outer guide cylinder 442 has a second guide channel 4422 that runs through from top to bottom, and the inner wall of the second guide channel 4422 is also radially provided with a release groove 4421; the outer side of the guide screw 443 is also threaded with an adjusting nut 444 for limiting and adjusting the position of the outer guide cylinder 442; the inner guide cylinder 445 is clamped with the connecting end of the transmission member 441 through the elastic separation element 446 embedded in its side wall; the transmission member 441 is coaxially slidably arranged in the inner guide cylinder 445, and the top of the inner guide cylinder 445 is fixedly connected to the output end of the second linear drive 43.

[0060] The release groove 4421 is trapezoidally opened radially on the inner wall of the outer guide tube 442 and is disposed close to the bottom of the outer guide tube 442 .

[0061] The elastic separation element 446 has a contact end and a limit end. In the non-release state, the contact end of the elastic separation element 446 contacts the inner wall of the second guide channel 4422, and the limit end is engaged with the connecting end of the conductive member 441 to keep it fixed. When the inner guide cylinder 445 moves to the release groove 4421 position under the drive of the second linear drive 43, the contact end of the elastic separation element 446 disengages from the inner wall of the second guide channel 4422, moves radially and abuts against the inner wall of the release groove 4421; at this time, the limit end of the elastic separation element 446 will automatically disengage from the connecting end of the conductive member 441, realize the unlocking of the conductive member 441, and form a disconnection with the second linear drive 43. By adjusting the sliding position of the outer guide cylinder 442, the disconnection stroke between the conductive member 441 and the second linear drive 43 can be flexibly controlled to ensure the disconnection accuracy of the conductive member 441 when it moves to the preset stroke.

[0062] This design realizes the automatic unlocking function of the conductive member 441 when it moves to the preset stroke, avoiding misoperation or workpiece damage caused by excessive pressure. At the same time, by adjusting the position of the outer guide tube 442 to control the disconnection stroke, accurate cold welding pressure can be applied, improving the stability and safety of the welding operation.

[0063] See also Figure 8 and Fig.10 As shown: the inner guide cylinder 445 is composed of an upper cylinder part 4451 and a lower cylinder part 4452 which are coaxially arranged and fixedly connected end to end; the diameter of the lower cylinder part 4452 is larger than that of the upper cylinder part 4451; the inner wall of the lower cylinder part 4452 is also radially opened with a rectangular through hole 4453 and a partition plate 4454 is fixedly arranged in the rectangular through hole 4453; the elastic separation element 446 is movably arranged in the rectangular through hole 4453.

[0064] The upper tube portion 4451 and the lower tube portion 4452 are both hollow cylindrical bodies with openings at both ends. Since the elastic separation element 446 is radially arranged in the lower tube portion 4452, when the elastic separation element 446 is separated from the conductive member 441, there is still space in the upper tube portion 4451 for the conductive member 441 to move in a non-limited state.

[0065] See also Figure 4As shown: the elastic separation element 446 includes a movable rod 4461, a limiting portion 4462, a roller 4463, a spring 4464 and a flange 4465; the movable rod 4461 is slidably set in the rectangular through hole 4453 through the limiting portion 4462 fixed at the front end, and the movable rod 4461 is set through the partition 4454 and slidably cooperates with the partition 4454; the roller 4463 is rotatably set at the rear end of the movable rod 4461 relative to the limiting portion 4462; the flange 4465 is coaxially fixedly set outside the movable rod 4461 and is set close to the limiting portion 4462; the spring 4464 is coaxially sleeved and installed outside the movable rod 4461, one end of the spring 4464 abuts against the partition 4454, and the other end of the spring 4464 abuts against the flange 4465; the movable rod 4461 is always moved radially toward the outer guide cylinder 442 under the elastic support of the spring 4464.

[0066] The end of the movable rod 4461 on which the limiting portion 4462 is installed is a limiting end, and the end of the movable rod 4461 on which the roller 4463 is installed is an abutting end.

[0067] When the movable rod 4461 is in a non-working state, the roller 4463 movably arranged at the rear end is always abutted against the inner wall of the outer guide cylinder 442, so that the movable rod 4461 is in a continuously compressed state and the limiting part 4462 fixedly arranged at the other end of the movable rod 4461 is engaged with the connecting end of the conductive member 441, thereby achieving the purpose of continuously limiting and fixing the conductive member 441; when it is necessary to drive the cold welding head 41 to perform cold welding between the silver contact and the workpiece, the output shaft of the second linear drive 43 extends to drive the inner guide cylinder 445 to continuously move toward the bottom of the outer guide cylinder 442, thereby achieving the purpose of driving the cold welding head 41 to contact the silver contact and achieve cold welding between the silver contact and the workpiece. In the process of driving the inner guide cylinder 445 to move continuously, when the inner guide cylinder 445 moves to the release groove 4421, the movable rod 4461 is gradually reset under the support of the spring 4464, prompting the limiting part 4462 to disengage from the connecting end of the conductive member 441, thereby automatically releasing the conductive member 441 after the cold welding is completed.

[0068] The present invention can not only actively suppress the deformation of the silver contacts when welding the silver contacts, but also can always maintain a uniform pressure to weld the silver contacts.

[0069] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the protection of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A cold welding device for multi-layer composite silver contacts, used for welding silver contacts to workpieces, characterized in that: include: Rack(1); A limit module (2), the limit module (2) being fixedly arranged on the frame (1), the limit module (2) being provided with a limit seat (21) capable of limiting and fixing the workpiece, and the limit seat (21) being provided with a limit slot (22) for loading the workpiece; The guide module (3) is fixedly arranged on the frame (1) in a vertical state and is located above the limit module (2); the guide module (3) is provided with a guide frame (31) capable of positioning and guiding the silver contact and a first linear drive (32) capable of driving the guide frame (31) to longitudinally approach or move away from the limit module (2); the guide end of the guide frame (31) is arranged opposite to the limit slot (22); when the silver contact to be welded is placed in the guide frame (31), the silver contact will fall into the limit slot (22); The cold welding module (4) is fixedly arranged on the frame (1) in a vertical state and is located above the guide module (3); the cold welding module (4) is provided with a cold welding head (41) that can move along the guide direction of the guide frame (31) and can perform cold welding between the silver contact and the workpiece; The guiding module (3) further comprises a first supporting frame (33), a connecting frame (34) and a mounting frame (35); The guide frame (31) is detachably arranged in the mounting frame (35); Two groups of the first linear drivers (32) are provided, and the two groups of first linear drivers (32) are symmetrically mounted on the frame (1) in a vertical state via a first support frame (33); The mounting frame (35) is horizontally arranged between the two groups of first linear drivers (32) and is fixedly connected to the driving ends of the two groups of first linear drivers (32) through the connecting frame (34); the mounting frame (35) is a rectangular warehouse structure that is hollow and has openings at both ends; and correction rods (36) are vertically arranged at the four corners of the top of the mounting frame (35). The guide frame (31) is composed of a mounting plate (311) and a guide portion (312) vertically arranged below the mounting plate (311); the mounting plate (311) and the mounting frame (35) are in abutment with each other; the guide portion (312) has a first guide channel (313) running through from top to bottom, and the first guide channel (313) is used to guide the silver contact to move along a fixed path.

2. A cold welding device for multi-layer composite silver contacts according to claim 1, characterized in that: The guiding module (3) further comprises an electromagnetic heating element (37) and a heating ring (38); The electromagnetic heating element (37) is embedded in the inner wall of the mounting frame (35) and is arranged close to the bottom of the mounting frame (35); The heating ring (38) is embedded in the outer wall of the guide frame (31) and is arranged close to the bottom of the guide frame (31).

3. A cold welding device for multi-layer composite silver contacts according to claim 2, characterized in that: The limit module (2) also includes a slide rail (23) and a sliding platform (24); Two slide rails (23) are provided, and the two slide rails (23) are symmetrically arranged on the frame (1) along the long side direction of the frame (1); The sliding platform (24) is horizontally arranged across the two sliding rails (23) and is slidably matched with the sliding rails (23); a driving handle (241) capable of driving the sliding platform (24) to slide and switch between a loading station and a welding station, and a locking member (242) capable of locking the sliding platform (24) to the welding station are also fixedly arranged on the sliding platform (24).

4. A cold welding device for multi-layer composite silver contacts according to claim 3, characterized in that: The limiting module (2) also includes a limiting plate (25) capable of positioning the sliding platform (24) located at the welding station; the limiting plate (25) is fixedly arranged on the frame (1) in a vertical state and is arranged between the two slide rails (23).

5. The cold welding device for multi-layer composite silver contacts according to claim 1, characterized in that: The cold welding module (4) further comprises a second support frame (42), a second linear drive (43) and a fixed-distance conduction unit (44); The second linear drive (43) is fixedly arranged on the frame (1) in a vertical state via the second support frame (42) and is located above the guide module (3); The cold welding head (41) is fixedly connected to the driving end of the second linear drive (43) via a fixed distance conduction unit (44); The fixed-distance conduction unit (44) is provided with a conduction member (441) capable of automatically disconnecting from the output end of the second linear drive (43) after moving to a preset stroke; the cold welding head (41) is detachably arranged at the lower end of the conduction member (441).

6. A cold welding device for multi-layer composite silver contacts according to claim 5, characterized in that: The distance transmission unit (44) further comprises an outer guide cylinder (442), a guide screw (443), an inner guide cylinder (445) and an elastic separation element (446); The outer guide cylinder (442) is movably mounted on the second support frame (42) via a guide screw (443), and is coaxially arranged with the output end of the second linear drive (43); the outer guide cylinder (442) has a second guide channel (4422) extending from top to bottom, and a release groove (4421) is radially provided on the inner wall of the second guide channel (4422); The outside of the guide screw (443) is also threaded with an adjustment nut (444) for limiting and adjusting the position of the outer guide cylinder (442). The inner guide cylinder (445) is clamped with the connection end of the conductive member (441) via an elastic separation element (446) embedded in the side wall thereof; the conductive member (441) is coaxially slidably arranged in the inner guide cylinder (445), and the top of the inner guide cylinder (445) is fixedly connected to the output end of the second linear drive (43).

7. A cold welding device for multi-layer composite silver contacts according to claim 6, characterized in that: The inner guide cylinder (445) is composed of an upper cylinder portion (4451) and a lower cylinder portion (4452) which are coaxially arranged and fixedly connected end to end; The diameter of the lower cylinder (4452) is larger than that of the upper cylinder (4451); a rectangular through hole (4453) is radially opened on the inner wall of the lower cylinder (4452), and a partition (4454) is fixedly provided in the rectangular through hole (4453); The elastic separation element (446) is movably disposed in the rectangular through hole (4453).

8. The cold welding device for multi-layer composite silver contacts according to claim 7, characterized in that: The elastic separation element (446) comprises a movable rod (4461), a limiting portion (4462), a roller (4463), a spring (4464) and a flange (4465); The movable rod (4461) is slidably arranged in the rectangular through hole (4453) via a limiting portion (4462) fixedly arranged at the front end, and the movable rod (4461) is arranged through the partition plate (4454) and slidably cooperates with the partition plate (4454); The roller (4463) is rotatably arranged at the rear end of the movable rod (4461) relative to the limiting portion (4462); the flange (4465) is coaxially fixedly arranged outside the movable rod (4461) and is arranged close to the limiting portion (4462); The spring (4464) is coaxially sleeved and installed outside the movable rod (4461), one end of the spring (4464) is in contact with the partition (4454), and the other end of the spring (4464) is in contact with the flange (4465); the movable rod (4461) is always moved radially toward the outer guide tube (442) under the elastic support of the spring (4464).

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