A solder paste printing mechanism for semiconductor die bonders and clamping equipment

Abstract

The present invention relates to the technical field of semiconductor chip mounting equipment, and in particular to a solder paste printing mechanism used in semiconductor die bonders and clamping welding equipment, comprising a lifting component, wherein the lifting component is responsible for lifting a lead frame from a film-passing track mechanism to a certain height; and a printing component, wherein the printing component is responsible for completing the solder paste printing on the lifted lead frame. The present invention cooperates with the lifting component and the printing component, wherein the lifting component is responsible for lifting the lead frame from the film-passing track mechanism to a certain height, and the printing component is responsible for completing the solder paste printing on the lifted lead frame. After printing is completed, the lifting component lowers the lead frame into the film-passing track and is clamped by a clamp and transported to the next process, thereby effectively improving the UPH and the accuracy of the tin solder paste points on the lead frame. Meanwhile, the invention can be used not only for solder paste printing, but also for printing conductive glue or silver paste, thereby improving the versatility of the equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of semiconductor patch equipment, and in particular relates to a solder paste printing mechanism applied to a semiconductor die bonder and a clamping soldering device. Background Art

[0002] At present, all the die bonders and clamping devices on the market can only perform glue dispensing on the surface of bare lead frames and die bonded lead frames. Since the number of products contained in a lead frame is usually hundreds, in order to meet the increasingly high UPH requirements of customers, it can only be achieved by connecting multiple machines in parallel or installing multiple glue dispensing mechanisms on one machine.

[0003] However, when multiple machines are connected in parallel or multiple mechanisms are installed on one machine for dispensing operations, this inevitably leads to an increase in cost, and the dispensing mechanism dispenses hundreds of products on a lead frame, and the position accuracy and size consistency of the dispensing are difficult to control. Therefore, we need to propose a solder paste printing mechanism for semiconductor die bonders and clamping equipment to solve the above-mentioned problems, so that it can be used for solder paste printing, as well as for printing conductive glue or silver paste, while also improving the accuracy of UPH and tin paste points on the lead frame. Summary of the invention

[0004] In view of the above problems, the present invention provides a solder paste printing mechanism applied to a semiconductor die bonder and a clamping device, comprising: a lifting component, the lifting component is responsible for lifting the lead frame from the film track mechanism to a certain height;

[0005] The lifting assembly includes a scraper tray, a lifting module and a lifting drive module, and the lifting drive module can drive the lifting module to lift the scraper tray to a desired height;

[0006] A printing component, which is responsible for completing the solder paste printing on the lead frame after lifting;

[0007] The printing assembly includes a YZ module and a printing module capable of printing solder paste or conductive glue or silver paste, wherein the YZ module is used to move the printing module on the X-axis, the Y-axis and the Z-axis so as to move the printing module to the top of the lead frame where the solder paste needs to be printed;

[0008] The printing module consists of a printing drive module, a printing steel mesh mounting bracket and a reciprocating scraper module. The printing steel mesh mounting bracket is installed on the printing drive module, and the reciprocating scraper module is installed on the printing drive module. The printing drive module drives the reciprocating scraper module to complete the reciprocating glue scraping action.

[0009] Furthermore, the scraper tray includes a scraper plate for supporting the lead frame, a pad block is installed below the scraper plate, the pad block is installed on the lifting module, and a positioning pin for positioning the lead frame is provided on the upper surface of the scraper plate.

[0010] Furthermore, the jacking module includes a jacking gantry and a lifting top plate, a jacking mechanism is installed inside the jacking gantry, the lifting top plate is located above the jacking gantry, second support plates are fixed on opposite sides of the lifting top plate, the second support plates are slidably connected to the side walls of the jacking gantry, and the second support plates are connected to both sides of the jacking mechanism, a second sensor sheet is installed at the lower end of one of the second support plates, a second groove photoelectric sensor corresponding to the second sensor sheet is installed on one side of the jacking gantry, and the lower end of the jacking mechanism is connected to the jacking drive module.

[0011] Furthermore, the lifting mechanism includes a screw support seat and a ball grinding screw, the screw support seat is installed at the lower end of the lifting gantry, one end of the ball grinding screw is rotatably installed on the screw support seat, and the other end of the ball grinding screw passes through the upper end of the lifting gantry and is rotatably connected to the lifting top plate, a screw nut is threadedly connected to the ball grinding screw, a nut mounting block is sleeved on the outside of the screw nut, and the nut mounting block is rotatably connected in the lifting gantry, the ball grinding screw is connected to the upper end of the lifting gantry through a third bearing, and two of the second support plates are fixed on opposite sides of the nut mounting block.

[0012] Furthermore, the lifting drive module includes a fourth motor, a scraper adjustment base plate and a third synchronous belt. The fourth motor is installed on the scraper adjustment base plate through a motor seat. The lower end of the ball grinding screw and the output shaft of the fourth motor are both installed with a third synchronous wheel. The two third synchronous wheels are connected by a third synchronous belt transmission.

[0013] Furthermore, the YZ module is composed of a YZ driving module and an X-direction horizontal adjustment module. The YZ driving module is responsible for driving the position movement in the Y and Z directions, and the X-direction horizontal adjustment module is responsible for adjusting the horizontal adjustment of the printing module installed on the YZ module in the X direction.

[0014] Furthermore, the X-direction horizontal adjustment module includes a lifting plate, a floating plate and two first adjusting screws, the lifting plate is installed on the first slider, a rotating shaft is rotatably installed on the lifting plate through a bearing mechanism, one end of the rotating shaft is connected to the floating plate, two first adjusting screws are threadedly connected to both sides of the upper end of the floating plate, and a screw clamping block is arranged between the first adjusting screw and the floating plate, one side of the screw clamping block is threadedly connected to a clamping screw, a second slide rail is installed on one side of the floating plate, and the printing module is installed on the slider of the second slide rail.

[0015] Furthermore, the printing drive module includes a slide rail base plate and a third motor, a synchronous wheel transmission member for driving the reciprocating scraper module to move is installed on the slide rail base plate, and the reciprocating scraper module is slidingly connected to the slide rail base plate, and the third motor is installed at one end of the synchronous wheel transmission member.

[0016] Furthermore, the printing steel mesh mounting bracket includes a first bracket plate, a second bracket plate is fixed at the lower end of the first bracket plate, a third bracket plate is sleeved on the outside of the second bracket plate, clamp mounting plates are installed at both ends of the third bracket plate, quick clamps are installed on the clamp mounting plates, and steel mesh positioning pins for positioning the printing steel mesh are provided on the lower surface of the third bracket plate, supporting ribs are installed at both ends of the upper surface of the first bracket plate, and Y-axis horizontal adjustment plates are installed at both ends of the first bracket plate through two Y-axis adjustment screws, and the Y-axis horizontal adjustment plate is connected to the side walls at both ends of the first bracket plate through Y-axis horizontal positioning pins.

[0017] Furthermore, the reciprocating scraper module includes a slider mounting plate installed on the linear slider, a first belt clamp and a second belt clamp are fixed on one side of the slider mounting plate, the first belt clamp and the second belt clamp are fixed on both sides of the belt body of the second synchronous belt, and a cylinder mounting plate is slidably installed on the other side of the slider mounting plate, two groups of scraper lifting cylinders are installed at the lower end of the cylinder mounting plate, a scraper mounting plate is installed at the piston rod end of the scraper lifting cylinder, a scraper blade is installed on the scraper mounting plate, and the two groups of scraper blades are symmetrically arranged.

[0018] The beneficial effects of the present invention are:

[0019] The present invention cooperates with a lifting component and a printing component. The lifting component is responsible for lifting the lead frame from the film-passing track mechanism to a certain height, and the printing component is responsible for completing the solder paste printing on the lifted lead frame. After printing is completed, the lifting component lowers the lead frame into the film-passing track and is clamped by a clamp and transported to the next process, thereby effectively improving the UPH and the accuracy of the tin paste points on the lead frame.

[0020] The solder paste printing mechanism composed of a lifting component and a printing component can be used not only for solder paste printing but also for printing conductive adhesive or silver paste, thereby improving the versatility of the equipment.

[0021] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of an embodiment of the present invention is shown;

[0024] Figure 2 A schematic diagram of the structure of a printing assembly according to an embodiment of the present invention is shown;

[0025] Figure 3 It shows a schematic diagram of the structure of the X-direction horizontal adjustment module according to an embodiment of the present invention;

[0026] Figure 4 It shows a schematic diagram of the structure of a YZ driving module according to an embodiment of the present invention;

[0027] Figure 5 It shows a schematic diagram of the structure of a printing module according to an embodiment of the present invention;

[0028] Figure 6 A schematic diagram of the structure of a printing drive module according to an embodiment of the present invention is shown;

[0029] Figure 7 A schematic diagram of the structure of a printed steel mesh mounting bracket according to an embodiment of the present invention is shown;

[0030] Figure 8 It shows a schematic structural diagram of a reciprocating scraper module according to an embodiment of the present invention;

[0031] Fig. 9 A schematic diagram of the structure of a jacking assembly according to an embodiment of the present invention is shown;

[0032] Fig.10 A schematic diagram of the structure of a scraper tray according to an embodiment of the present invention is shown;

[0033] Fig.11 A schematic structural diagram of a lifting module according to an embodiment of the present invention is shown;

[0034] Fig.12 A schematic structural diagram of a lifting drive module according to an embodiment of the present invention is shown.

[0035] In the figure: 1, printing assembly; 11, YZ module; 111, YZ drive module; 1111, first bottom plate; 1112, first drag chain; 1113, Y-axis screw rod seat; 1114, first slider; 1115, first slide rail; 1116, first support plate; 1117, Z-axis screw rod seat; 1118, first motor; 1119, connecting plate; 11110, second motor;

[0036] 112, X-direction horizontal adjustment module; 1121, bearing gland; 1122, angular contact ball bearing; 1123, lifting plate; 1124, bearing retaining ring; 1125, bearing seat; 1126, rotating shaft; 1127, clamping screw; 1128, floating plate; 1129, second slide rail; 11210, screw clamping block; 11211, first adjustment screw;

[0037] 12. Printing module; 121. Printing drive module; 1211. Bearing mounting seat; 1212. First outer retaining spring; 1213. First deep groove ball bearing; 1214. Bearing bushing; 1215. Internal retaining spring; 1216. Small shaft; 1217. Second outer retaining spring; 1218. Follower synchronous wheel; 1219. Slide rail bottom plate; 12110. First linear slide rail; 12111. Mounting sheet metal; 12112. First groove photoelectric sensor; 12113. Synchronous belt pulley; 12114. Third motor; 12115. Second synchronous belt; 12116. Second deep groove ball bearing;

[0038] 122, printing steel mesh mounting bracket; 1221, first bracket plate; 1222, supporting rib plate; 1223, Y-axis adjusting screw; 1224, Y-axis horizontal positioning pin; 1225, second bracket plate; 1226, third bracket plate; 1227, steel mesh positioning pin; 1228, fixture mounting plate; 1229, quick fixture; 12210, Y-axis horizontal adjustment plate;

[0039] 123, reciprocating scraper module; 1231, slider mounting plate; 1232, reciprocating drag chain; 1233, fixed sheet metal; 1234, first belt clamp; 1235, second belt clamp; 1236, limit sheet metal; 1237, Z-axis linear slide rail; 1238, cylinder mounting plate; 1239, scraper lifting cylinder; 12310, scraper swing bearing; 12311, shaft retaining ring; 12312, scraper pressure plate; 12313, scraper blade; 12314, scraper mounting plate; 12315, first swing shaft; 12316, first scraper lifting bracket; 12317, second scraper lifting bracket; 12318, scraper spring; 12319, spring adjustment rod; 12320, spring adjustment seat;

[0040] 2. Lifting assembly; 21. Glue scraping tray; 211. Lead frame; 212. Glue scraping plate; 213. Heightening block; 214. Positioning pin;

[0041] 22, lifting module; 221, lifting top plate; 222, third bearing; 223, third linear slide rail; 224, third linear slide block; 225, nut mounting block; 226, second support plate; 227, lifting gantry; 228, lead screw nut; 229, ball grinding lead screw; 2210, lead screw support seat; 2211, second sensor sheet; 2212, second groove photoelectric sensor;

[0042] 23. Lifting drive module; 231. Glue scraping adjustment base plate; 232. Fourth motor; 233. Motor seat; 234. Third synchronous wheel; 235. Third synchronous belt. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] The embodiment of the present invention provides a solder paste printing mechanism for semiconductor die bonder and clamping device, such as Figure 1-12 As shown, it includes a lifting component 2 and a printing component 1, wherein the lifting component 2 is responsible for lifting the lead frame 211 from the film-passing track mechanism to a certain height; and the printing component 1 is responsible for completing the solder paste printing on the lifted lead frame 211;

[0045] like Fig. 9 As shown, the lifting assembly 2 includes a scraper tray 21, a lifting module 22 and a lifting drive module 23. The lifting drive module 23 can drive the lifting module 22 to lift the scraper tray 21 to a desired height.

[0046] like Fig.10 As shown, the scraper tray 21 includes a scraper plate 212 for supporting a lead frame 211, a heightening block 213 is installed below the scraper plate 212, and the heightening block 213 is installed on the lifting module 22. The upper surface of the scraper plate 212 is provided with positioning pins 214 for positioning the lead frame 211, so as to facilitate the accurate placement of the lead frame 211 on the scraper plate 212.

[0047] like Fig.11As shown, the jacking module 22 includes a jacking gantry 227 and a lifting top plate 221, a jacking mechanism is installed inside the jacking gantry 227, the lifting top plate 221 is located above the jacking gantry 227, and second support plates 226 are fixed on opposite sides of the lifting top plate 221, the second support plates 226 are slidably connected to the side walls of the jacking gantry 227, and the second support plates 226 are connected to the two sides of the jacking mechanism, a second induction sheet 2211 is installed at the lower end of one of the second support plates 226, and a second induction sheet 2211 is installed on one side of the jacking gantry 227. There is a second groove photoelectric sensor 2212 corresponding to the second sensing sheet 2211. The lower end of the lifting mechanism is connected to the lifting drive module 23. The lifting drive module 23 drives the lifting mechanism to lift or lower the lifting mechanism, so that the lifting mechanism drives the lifting top plate 221 to rise or fall, thereby using the lifting top plate 221 to drive the scraper tray 21 to move to a suitable height. The cooperation of the second groove photoelectric sensor 2212 and the second sensing sheet 2211 can accurately confirm the height of the lifting top plate 221, thereby facilitating the accurate grasp of the position of the scraper tray 21.

[0048] The lifting mechanism includes a screw support seat 2210 and a ball grinding screw 229, wherein the screw support seat 2210 is mounted on the lower end of the lifting gantry 227, one end of the ball grinding screw 229 is rotatably mounted on the screw support seat 2210, and the other end of the ball grinding screw 229 passes through the upper end of the lifting gantry 227 and is rotatably connected to the lifting top plate 221, and a screw nut 228 is threadedly connected to the ball grinding screw 229, and a nut mounting block 225 is sleeved on the outside of the screw nut 228, and the nut mounting block 225 is mounted on the top The lifting gantry 227 is rotatably connected, the ball grinding screw 229 is connected to the upper end of the lifting gantry 227 through a third bearing 222, and the two second support plates 226 are fixed on the opposite sides of the nut mounting block 225. When the ball grinding screw 229 rotates, the nut mounting block 225 can be horizontally raised or lowered on the ball grinding screw 229 by utilizing the threaded connection between the screw nut 228 and the ball grinding screw 229, and the second support plate 226 is driven to rise or fall through the nut mounting block 225, so as to drive the lifting top plate 221 to rise or fall.

[0049] The third linear slide rails 223 are fixed at both ends of the opposite sides of the lifting gantry 227, and the third linear sliders 224 are slidably connected to the third linear slide rails 223. The third linear sliders 224 are respectively fixed to the second support plates 226. Through the cooperation between the third linear sliders 224 and the third linear slide rails 223, the second support plate 226 can stably move in a straight line.

[0050] like Fig.12As shown, the lifting drive module 23 includes a fourth motor 232, a scraper adjustment base plate 231 and a third synchronous belt 235. The fourth motor 232 is installed on the scraper adjustment base plate 231 through a motor seat 233. The third synchronous wheel 234 is installed on the lower end of the ball grinding screw 229 and the output shaft of the fourth motor 232. The two third synchronous wheels 234 are connected by a third synchronous belt 235. The fourth motor 232 is configured as a stepping motor. The third synchronous wheel 234 is driven to rotate by the fourth motor 232, so that the third synchronous wheel 234 drives the ball grinding screw 229 to rotate by the third synchronous belt 235, so that the lifting top plate 221 can be driven to rise or fall by the rotating ball grinding screw 229.

[0051] like Figure 2 As shown, the printing assembly 1 includes a YZ module 11 and a printing module 12 capable of printing solder paste or conductive glue or silver paste, and the YZ module 11 is used to move the printing module 12 on the X-axis, Y-axis and Z-axis to move the printing module 12 to the top of the lead frame 211 where solder paste needs to be printed;

[0052] like Figure 3 As shown, the YZ module 11 is composed of a YZ driving module 111 and an X-direction horizontal adjustment module 112. The YZ driving module 111 is responsible for driving the position movement in the Y and Z directions, and the X-direction horizontal adjustment module 112 is responsible for adjusting the horizontal adjustment of the printing module 12 installed on the YZ module 11 in the X direction to facilitate the precise printing of the lead frame 211.

[0053] like Figure 4As shown, the YZ driving module 111 includes a first base plate 1111, a first motor 1118 and a second motor 11110, a Y-axis screw seat 1113 is installed on the first base plate 1111, and the Y-axis screw seat 1113 is internally rotatably connected to a first screw rod, a Y-axis slider is threadedly connected to the first screw rod, and the Y-axis slider is slidably connected to the Y-axis screw seat 1113, the first motor 1118 is installed at one end of the first screw rod, a first support plate 1116 is installed on the Y-axis slider, a Z-axis screw seat 1117 is installed on one side of the first support plate 1116, the Z-axis screw seat 1117 is internally rotatably connected to a Z-axis screw rod, a Z-axis slider is threadedly connected to the Z-axis screw rod, and the Z-axis slider is slidably connected to the Z-axis screw seat 11 17 is slidably connected, the X-direction horizontal adjustment module 112 is installed on the Z-direction slider, and the X-direction horizontal adjustment module 112 is slidably connected to the other side of the first support plate 1116, the second motor 11110 is installed on the Y-direction slider, and the output shaft of the second motor 11110 is transmission-connected to the Z-direction lead screw through a transmission mechanism, the first motor 1118 drives the Y-direction lead screw to rotate, so that the Y-direction slider drives the Z-direction lead screw seat 1117 and the first support plate 1116 to move horizontally on the Y-direction lead screw, the second motor 11110 drives the Z-direction lead screw to rotate through the transmission mechanism, so that the Z-direction slider drives the X-direction horizontal adjustment module 112 to move horizontally on the Z-direction lead screw, thereby adjusting the position of the X-direction horizontal adjustment module 112 in the Y and Z directions.

[0054] The transmission mechanism includes two first synchronous wheels and a synchronous belt. The second motor 11110 is installed on the Y-axis slider through a motor mounting seat. The two first synchronous wheels are respectively sleeved on the output shaft of the second motor 11110 and one end of the Z-axis lead screw. The synchronous belt is sleeved on the two first synchronous wheels. The second motor 11110 drives the first synchronous wheel to rotate, so that the first synchronous wheel drives the Z-axis lead screw to rotate, thereby adjusting the position of the Z-axis slider on the Z-axis lead screw.

[0055] A first drag chain 1112 is also installed on the upper surface of the first base plate 1111, and a connecting plate 1119 is installed at one end of the first drag chain 1112. A straight plate is fixed to one end of the connecting plate 1119, and one end of the straight plate is fixed to one side of the first support plate 1116, so that when the first support plate 1116 moves horizontally in the Y direction, the first drag chain 1112 is used to provide supporting force for the first support plate 1116, thereby improving the stability of the movement of the first support plate 1116.

[0056] The first support plate 1116 has first slide rails 1115 fixed at both ends of the other side. The first slide rails 1115 are slidably connected with first sliders 1114. The X-direction horizontal adjustment module 112 is mounted on the first sliders 1114. The sliding cooperation between the first sliders 1114 and the first slide rails 1115 facilitates the linear movement of the X-direction horizontal adjustment module 112.

[0057] like Figure 3 As shown, the X-direction horizontal adjustment module 112 includes a lifting plate 1123, a floating plate 1128 and two first adjustment screws 11211. The lifting plate 1123 is installed on the first slider 1114. A rotating shaft 1126 is rotatably installed on the lifting plate 1123 through a bearing mechanism. One end of the rotating shaft 1126 is connected to the floating plate 1128. The two first adjustment screws 11211 are threadedly connected to both sides of the upper end of the floating plate 1128, and the first adjustment screws 11211 and the floating plate 1128 are connected. A screw clamping block 11210 is provided, and a clamping screw 1127 is threadedly connected to one side of the screw clamping block 11210. A second slide rail 1129 is installed on one side of the floating plate 1128. The printing module 12 is installed on the slider of the second slide rail 1129. The floating plate 1128 is fine-tuned by rotating two first adjusting screws 11211 so that the floating plate 1128 follows the rotation of the bearing mechanism to achieve horizontal adjustment. After adjustment, the clamping screw 1127 is used to clamp the first adjusting screw 11211 to fix the horizontal position.

[0058] The bearing mechanism includes a bearing cover 1121, an angular contact ball bearing 1122, a bearing retaining ring 1124 and a bearing seat 1125. The angular contact ball bearing 1122 is installed inside the bearing seat 1125, and the bearing cover 1121 is installed at one end of the bearing seat 1125. One end of the bearing seat 1125 is connected to the lifting plate 1123 through the bearing retaining ring 1124, and the other end of the rotating shaft 1126 is inserted into the interior of the angular contact ball bearing 1122. Through the setting of the angular contact ball bearing 1122, it is convenient to achieve horizontal adjustment by fine-tuning the floating plate 1128 to follow the rotation of the angular contact ball bearing 1122 through two first adjusting screws 11211.

[0059] like Figure 5 As shown, the printing module 12 is composed of a printing drive module 121, a printing steel mesh mounting bracket 122 and a reciprocating scraper module 123. The printing steel mesh mounting bracket 122 is installed on the printing drive module 121, and the reciprocating scraper module 123 is installed on the printing drive module 121. The printing drive module 121 drives the reciprocating scraper module 123 to complete the reciprocating glue scraping action.

[0060] like Figure 6As shown, the printing drive module 121 includes a slide rail base plate 1219 and a third motor 12114, and a synchronous wheel transmission component for driving the reciprocating scraper module 123 to move is installed on the slide rail base plate 1219, and the reciprocating scraper module 123 is slidingly connected to the slide rail base plate 1219, and the third motor 12114 is installed at one end of the synchronous wheel transmission component. The third motor 12114 is set as a stepping motor, so that the third motor 12114 drives the synchronous wheel transmission component to work, so as to drive the reciprocating scraper module 123 to reciprocate.

[0061] The synchronous wheel transmission component includes a follower synchronous wheel 1218 and a synchronous belt pulley 12113, and the synchronous belt pulley 12113 is installed on the output shaft of the third motor 12114. The follower synchronous wheel 1218 is rotatably connected to the slide rail base plate 1219 through a bearing component, and the synchronous belt pulley 12113 and the follower synchronous wheel 1218 are externally sleeved with a second synchronous belt 12115. One end of the reciprocating scraper module 123 is fixed to the second synchronous belt 12115, so that the second synchronous belt 12115 can drive the reciprocating scraper module 123 to move reciprocatingly when moving in a circle.

[0062] The bearing assembly comprises a bearing mounting seat 1211, a first deep groove ball bearing 1213 and a second deep groove ball bearing 12116 are mounted inside the bearing mounting seat 1211, a bearing bushing 1214 is arranged between the first deep groove ball bearing 1213 and the second deep groove ball bearing 12116, a small shaft 1216 is inserted inside the bearing bushing 1214, a first external retaining ring 1212 is sleeved on the small shaft 1216 between the first deep groove ball bearing 1213 and the bearing mounting seat 1211, and the second deep groove ball bearing 1216 is sleeved on the first deep groove ball bearing 1213 and the second deep groove ball bearing 1216. A second external retaining spring 1217 is sleeved on the small shaft 1216 between 116 and the bearing mounting seat 1211, and an internal retaining spring 1215 is installed in the bearing mounting seat 1211 between the second deep groove ball bearing 12116 and the slide rail base plate 1219. One end of the small shaft 1216 passes through the slide rail base plate 1219 and is fixed to the driven synchronous wheel 1218, so that the synchronous pulley 12113 can drive the driven synchronous wheel 1218 to rotate through the second synchronous belt 12115 when rotating, thereby making the second synchronous belt 12115 move in a circle.

[0063] A first linear slide rail 12110 is installed on one side of the slide rail base plate 1219, and a linear slider for installing the reciprocating scraper module 123 is installed on the first linear slide rail 12110. A first sensing sheet is installed on one side of the linear slider. A first groove photoelectric sensor 12112 corresponding to the first sensing sheet is installed on one side of the slide rail base plate 1219. The sliding cooperation between the first linear slide rail 12110 and the linear slider is used to improve the movement stability of the reciprocating scraper module 123. At the same time, the cooperation between the first groove photoelectric sensor 12112 and the first sensing sheet can accurately confirm the position of the reciprocating scraper module 123.

[0064] A mounting sheet metal 12111 is also installed on one side of the slide rail bottom plate 1219, and a reciprocating motion drag chain 1232 is installed on the mounting sheet metal 12111. A fixed sheet metal 1233 is installed at one end of the motion drag chain. The fixed sheet metal 1233 is connected to the reciprocating scraper module 123, and the motion drag chain is used to provide support force for the reciprocating scraper module 123 to ensure the stability of the movement of the reciprocating scraper module 123.

[0065] like Figure 7 As shown, the printing steel mesh mounting bracket 122 includes a first bracket plate 1221, a second bracket plate 1225 is fixed to the lower end of the first bracket plate 1221, a third bracket plate 1226 is sleeved on the outer portion of the second bracket plate 1225, a clamp mounting plate 1228 is mounted on both ends of the third bracket plate 1226, a quick clamp 1229 is mounted on the clamp mounting plate 1228, and a steel mesh positioning pin 1227 for positioning the printing steel mesh is provided on the lower surface of the third bracket plate 1226 , support ribs 1222 are installed at both ends of the upper surface of the first bracket plate 1221, and Y-direction horizontal adjustment plates 12210 are installed at both ends of the first bracket plate 1221 through two Y-direction adjustment screws 1223, and the Y-direction horizontal adjustment plates 12210 are connected to the side walls of the first bracket plate 1221 at both ends through Y-direction horizontal positioning pins 1224, and the Y-direction horizontal adjustment of the printing steel mesh installed on the third bracket plate 1226 can be achieved by adjusting the four Y-direction adjustment screws 1223. Two printing steel mesh positioning pins 1227 installed on the lower surface of the third bracket plate 1226 play a role in positioning the printing steel mesh, and the printing steel mesh is clamped on the lower surface of the third bracket plate 1226 by two quick clamps 1229;

[0066] like Figure 8As shown, the reciprocating scraper module 123 includes a slider mounting plate 1231 mounted on a linear slider, a first belt clamp plate 1234 and a second belt clamp plate 1235 are fixed to one side of the slider mounting plate 1231, the first belt clamp plate 1234 and the second belt clamp plate 1235 are fixed to both sides of the belt body of the second synchronous belt 12115, and a cylinder mounting plate 1238 is slidably mounted on the other side of the slider mounting plate 1231, and two sets of The scraper lifting cylinder 1239 has a scraper mounting plate 12314 installed at the piston rod end of the scraper lifting cylinder 1239, and a scraper blade 12313 is installed on the scraper mounting plate 12314. The two groups of scraper blades 12313 are symmetrically arranged, and one end of the fixed sheet metal 1233 is fixed to the side wall of the cylinder mounting plate 1238. The scraper blade 12313 is driven to rise or fall by the scraper cylinder so that the scraper blade 12313 is in contact with the surface of the printed steel mesh for scraping.

[0067] A limiting sheet metal 1236 is fixed to the lower end of the slider mounting plate 1231, a Z-axis linear slide rail 1237 is installed on one side of the slider mounting plate 1231, the cylinder mounting plate 1238 is installed on the slider of the Z-axis linear slide rail 1237, a spring adjustment seat 12320 is fixed on the slider mounting plate 1231 located above the cylinder mounting plate 1238, a scraper spring 12318 is connected between the spring adjustment seat 12320 and the cylinder mounting plate 1238, a spring adjustment rod 12319 is inserted into the scraper spring 12318, and both ends of the spring adjustment rod 12319 are respectively connected to the spring adjustment seat 12320 and the cylinder mounting plate 1238, the scraper spring 12318 is used to provide a certain buffer space for the scraper blade 12313, so as to improve the fit of the scraper blade 12313 to the printing steel mesh and improve the printing quality.

[0068] The first scraper lifting bracket 12316 and the second scraper lifting bracket 12317 are installed at the lower end of the cylinder mounting plate 1238. The first scraper lifting bracket 12316 is rotatably connected to one of the scraper mounting plates 12314 through a first swing shaft 12315, and the second scraper lifting bracket 12317 is rotatably connected to the other scraper mounting plate 12314 through the first swing shaft 12315. The outer side of the first swing shaft is sleeved with a scraper swing bearing 12317. 310, the scraper swing bearing 12310 is embedded in the scraper mounting plate 12314, and the scraper swing bearing 12310 is provided with a shaft retaining spring 12311. The scraper blade 12313 is connected to the scraper mounting plate 12314 through a scraper pressing plate 12312. The scraper swing bearing 12310 and the shaft retaining spring 12311 are used in conjunction to make the scraper blade 12313 slightly swing at a certain angle to prevent deformation of the printing steel mesh caused by stress.

[0069] During operation, the printing assembly 1 is installed above the film-passing track, and the lifting assembly 2 is installed below the film-passing track. The lead frame 211 is clamped by the film-passing clamp and transported to the position below the printing assembly 1 to be brushed with solder paste. The lead frame 211 is positioned by the positioning pins 214 on the scraper tray 21 of the lifting assembly 2, and then the lifting assembly 2 lifts the lead frame 211 to the height for brushing solder paste.

[0070] At this time, a scraper lifting cylinder 1239 of the reciprocating scraper module 123 moves to press a group of scrapers down onto the laser steel mesh, and the stepper motor drives the reciprocating scraper module 123 to move to complete a solder paste printing. When the scraper lifting cylinder 1239 on the left side moves, it prints from left to right, and when the scraper lifting cylinder 1239 on the right side moves, it prints from right to left;

[0071] Finally, the lifting assembly 2 lowers the lead frame 211 back into the film track. After the positioning pins 214 of the scraper tray 21 disengage from the positioning holes on the lead frame 211, the film clamps clamp the lead frame 211 and transport it to the workstation of the next process, effectively improving the accuracy of UPH and the tin paste dots on the lead frame 211. At the same time, the solder paste printing mechanism can not only be used for solder paste printing, but also for printing conductive glue or silver paste, thereby improving the versatility of the equipment.

[0072] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A solder paste printing mechanism for semiconductor die bonders and clamping equipment, characterized in that: include: A lifting component (2), the lifting component (2) being responsible for lifting the lead frame (211) from the film-transfer track mechanism to a certain height; The lifting assembly (2) comprises a scraper tray (21), a lifting module (22) and a lifting drive module (23); the lifting drive module (23) can drive the lifting module (22) to rise and lift the scraper tray (21) to a desired height; A printing component (1), the printing component (1) being responsible for completing the action of printing solder paste on the lead frame (211) after being lifted; The printing assembly (1) comprises a YZ module (11) and a printing module (12) capable of printing solder paste or conductive glue or silver paste, wherein the YZ module (11) is used to move the printing module (12) on the X-axis, the Y-axis and the Z-axis so that the printing module (12) is moved to a position directly above the lead frame (211) on which solder paste needs to be printed; The printing module (12) is composed of a printing drive module (121), a printing steel mesh mounting bracket (122) and a reciprocating scraper module (123); the printing steel mesh mounting bracket (122) is mounted on the printing drive module (121); the reciprocating scraper module (123) is mounted on the printing drive module (121); and the printing drive module (121) drives the reciprocating scraper module (123) to complete a reciprocating scraping action; The reciprocating scraper module (123) comprises a slider mounting plate (1231) mounted on a linear slider, a first belt clamp (1234) and a second belt clamp (1235) being fixed on one side of the slider mounting plate (1231), the first belt clamp (1234) and the second belt clamp (1235) being fixed on both sides of the belt body of the second synchronous belt (12115), a cylinder mounting plate (1238) being slidably mounted on the other side of the slider mounting plate (1231), two groups of scraper lifting cylinders (1239) being mounted on the lower end of the cylinder mounting plate (1238), a scraper mounting plate (12314) being mounted on the piston rod end of the scraper lifting cylinder (1239), a scraper blade (12313) being mounted on the scraper mounting plate (12314), and the two groups of scraper blades (12313) being symmetrically arranged; A limiting sheet metal (1236) is fixed at the lower end of the slider mounting plate (1231), a Z-axis linear slide rail (1237) is installed on one side of the slider mounting plate (1231), the cylinder mounting plate (1238) is installed on the slider of the Z-axis linear slide rail (1237), a spring adjustment seat (12320) is fixed on the slider mounting plate (1231) located above the cylinder mounting plate (1238), a scraper spring (12318) is connected between the spring adjustment seat (12320) and the cylinder mounting plate (1238), a spring adjustment rod (12319) is inserted into the scraper spring (12318), and two ends of the spring adjustment rod (12319) are respectively connected to the spring adjustment seat (12320) and the cylinder mounting plate (1238); A first scraper lifting bracket (12316) and a second scraper lifting bracket (12317) are mounted at the lower end of the cylinder mounting plate (1238); the first scraper lifting bracket (12316) is rotatably connected to one of the scraper mounting plates (12314) via a first swing shaft (12315); the second scraper lifting bracket (12317) is rotatably connected to the other scraper mounting plate (12314) via the first swing shaft (12315); a scraper swing bearing (12310) is sleeved on the outside of the first swing shaft; the scraper swing bearing (12310) is embedded in the scraper mounting plate (12314); a shaft retaining spring (12311) is provided on the scraper swing bearing (12310); and the scraper blade (12313) is connected to the scraper mounting plate (12314) via a scraper pressing plate (12312).

2. The solder paste printing mechanism for semiconductor die bonders and clamping devices according to claim 1, characterized in that: The scraper tray (21) comprises a scraper plate (212) for supporting a lead frame (211), a padding block (213) is installed below the scraper plate (212), the padding block (213) is installed on the lifting module (22), and a positioning pin (214) for positioning the lead frame (211) is provided on the upper surface of the scraper plate (212).

3. The solder paste printing mechanism for semiconductor die bonders and clamping devices according to claim 2, characterized in that: The lifting module (22) comprises a lifting gantry (227) and a lifting top plate (221); a lifting mechanism is installed inside the lifting gantry (227); the lifting top plate (221) is located above the lifting gantry (227); second support plates (226) are fixed on opposite sides of the lifting top plate (221); the second support plates (226) are slidably connected to the side walls of the lifting gantry (227); and the second support plates (226) are connected to two sides of the lifting mechanism; a second sensing sheet (2211) is installed at the lower end of one of the second support plates (226); a second groove photoelectric sensor (2212) corresponding to the second sensing sheet (2211) is installed on one side of the lifting gantry (227); and the lower end of the lifting mechanism is connected to the lifting drive module (23).

4. The solder paste printing mechanism for semiconductor die bonder and clamping device according to claim 3, characterized in that: The lifting mechanism comprises a screw support seat (2210) and a ball grinding screw (229); the screw support seat (2210) is mounted on the lower end of the lifting gantry (227); one end of the ball grinding screw (229) is rotatably mounted on the screw support seat (2210); and the other end of the ball grinding screw (229) passes through the upper end of the lifting gantry (227) and is rotatably connected to the lifting top plate (221); a screw nut (228) is threadedly connected to the ball grinding screw (229); a nut mounting block (225) is sleeved on the outside of the screw nut (228); the nut mounting block (225) is rotatably connected inside the lifting gantry (227); the ball grinding screw (229) is connected to the upper end of the lifting gantry (227) via a third bearing (222); and two second support plates (226) are fixed on opposite sides of the nut mounting block (225).

5. The solder paste printing mechanism for semiconductor die bonder and clamping device according to claim 4, characterized in that: The lifting drive module (23) comprises a fourth motor (232), a scraper adjustment base plate (231) and a third synchronous belt (235); the fourth motor (232) is mounted on the scraper adjustment base plate (231) via a motor seat (233); a third synchronous wheel (234) is mounted on the lower end of the ball grinding screw (229) and the output shaft of the fourth motor (232); and the two third synchronous wheels (234) are connected in transmission via a third synchronous belt (235).

6. The solder paste printing mechanism for semiconductor die bonders and clamping devices according to claim 5, characterized in that: The YZ module (11) is composed of a YZ driving module (111) and an X-direction horizontal adjustment module (112); the YZ driving module (111) is responsible for driving position movement in the Y and Z directions; and the X-direction horizontal adjustment module (112) is responsible for adjusting the horizontal adjustment of the printing module (12) mounted on the YZ module (11) in the X direction.

7. The solder paste printing mechanism for semiconductor die bonder and clamping device according to claim 6, characterized in that: The X-direction horizontal adjustment module (112) comprises a lifting plate (1123), a floating plate (1128) and two first adjustment screws (11211); the lifting plate (1123) is mounted on a first slider (1114); a rotating shaft (1126) is rotatably mounted on the lifting plate (1123) via a bearing mechanism; one end of the rotating shaft (1126) is connected to the floating plate (1128); two first adjustment screws (11211) are threadedly connected to two sides of an upper end of the floating plate (1128); a screw clamping block (11210) is arranged between the first adjustment screw (11211) and the floating plate (1128); a clamping screw (1127) is threadedly connected to one side of the screw clamping block (11210); a second slide rail (1129) is mounted on one side of the floating plate (1128); and the printing module (12) is mounted on a slider of the second slide rail (1129).

8. The solder paste printing mechanism for semiconductor die bonder and clamping device according to claim 7, characterized in that: The printing drive module (121) comprises a slide rail base plate (1219) and a third motor (12114); a synchronous wheel transmission component for driving the reciprocating scraper module (123) to move is installed on the slide rail base plate (1219); the reciprocating scraper module (123) is slidably connected to the slide rail base plate (1219); and the third motor (12114) is installed at one end of the synchronous wheel transmission component.

9. The solder paste printing mechanism for semiconductor die bonder and clamping device according to claim 8, characterized in that: The printing steel mesh mounting bracket (122) comprises a first bracket plate (1221), a second bracket plate (1225) is fixed to the lower end of the first bracket plate (1221), a third bracket plate (1226) is sleeved on the outer portion of the second bracket plate (1225), a clamp mounting plate (1228) is mounted on both ends of the third bracket plate (1226), a quick clamp (1229) is mounted on the clamp mounting plate (1228), and the lower end of the third bracket plate (1226) is provided with a plurality of clamps. The surface is provided with steel mesh positioning pins (1227) for positioning the printing steel mesh, and supporting ribs (1222) are installed at both ends of the upper surface of the first bracket plate (1221), and Y-direction horizontal adjustment plates (12210) are installed at both ends of the first bracket plate (1221) through two Y-direction adjustment screws (1223), and the Y-direction horizontal adjustment plates (12210) are connected to the side walls of both ends of the first bracket plate (1221) through Y-direction horizontal positioning pins (1224).

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