A circuit board solder paste printer

Abstract

The utility model relates to a circuit board tin cream printing machine, including frame, be provided with lifting mechanism on the frame, and the lifting mechanism includes lifting plate, be provided with horizontal moving mechanism on the lifting plate, and the working end of horizontal moving mechanism is provided with scraper mechanism, and the bottom of lifting plate is provided with screen frame fixing mechanism, and the screen frame fixing mechanism includes two -way slide rail, screen frame positioning assembly and synchronous drive assembly, two -way slide rail sets up in the bottom of lifting plate, and two -way slide rail is equipped with two mutually close or far away moving plate, screen frame positioning assembly is equipped with a pair and mirror image sets up on two moving plates, and screen frame positioning assembly includes the back -type positioning frame for receiving screen frame and a plurality of clamping blocks for locating the top of screen frame, and clamping block equidistance distribution along the length direction of back -type positioning frame, and synchronous drive assembly sets up in the bottom of lifting plate, and the application solves the problem of high cost, complex structure.

Description

Technical Field

[0001] This utility model relates to the technical field of circuit board processing equipment, specifically to a circuit board solder paste printing machine. Background Technology

[0002] In the electronics manufacturing industry, solder paste printing, as the first step in the SMT (Surface Mount Technology) production line, directly affects the soldering quality of PCBs and the reliability of electronic products. Solder paste printers use a frame to fix a stencil and precisely print solder paste onto the PCB pads; therefore, the stability and adjustment accuracy of the frame fixing mechanism are crucial.

[0003] Chinese invention patent application (publication number CN104842634A) discloses a fully automatic solder paste printing machine. The machine's working platform, transport mechanism, stencil mechanism, CCD mechanism, and squeegee mechanism are all electrically connected to a control mechanism. The working platform is mounted on the frame, the transport mechanism is located above the working platform, the squeegee mechanism is mounted on the stencil mechanism, and the CCD mechanism is located on one side of the working platform. The working platform includes a base plate, a moving stage, a worktable, an X-adjustment seat assembly, a Y1-adjustment seat assembly, and a Y2-adjustment seat assembly. The X-adjustment seat assembly, Y1-adjustment seat assembly, and Y2-adjustment seat assembly are all slidably connected to the base plate. Width adjustment mechanisms are provided at both ends of the base plate. The moving stage is slidably mounted on the base plate, and the worktable is movably connected to the moving stage. This invention features a simple structure, low cost, easy board alignment, high precision, and fast response time. It can automatically adjust the PCB thickness and width, improve PCB positioning accuracy, increase the PCB-stencil matching rate, and improve printing quality.

[0004] However, the screen frame fixing mechanism of the aforementioned printing machine uses a multi-cylinder driven clamping block for clamping. This solution has the following significant drawbacks: First, the multiple cylinders and supporting air circuit system result in high hardware costs and complex installation and maintenance. Second, when multiple cylinders are driven independently, factors such as air pressure fluctuations and cylinder wear can easily lead to asynchronous clamping, causing uneven force on the screen frame and deformation. This, in turn, affects the bonding accuracy between the stencil and the PCB solder paste printing machine, resulting in problems such as solder paste printing offset and uneven thickness. Therefore, there is an urgent need for a solder paste printing machine with a low-cost and synchronous screen frame fixing mechanism. Utility Model Content

[0005] To address the aforementioned issues, a circuit board solder paste printing machine is provided. The synchronous drive component of this application drives the clamping blocks equidistantly distributed along the length of the U-shaped positioning frame on each moving plate to move synchronously through a transmission mechanism, thereby pressing and positioning the top of the frame, thus solving the problems of high cost and complex structure.

[0006] To address the existing technical problems, this utility model provides a circuit board solder paste printing machine, including a frame, a lifting mechanism on the frame, a lifting plate, a horizontal moving mechanism on the lifting plate, a scraper mechanism at the working end of the horizontal moving mechanism, and a wire frame fixing mechanism at the bottom of the lifting plate. The wire frame fixing mechanism includes a bidirectional slide rail, a wire frame positioning component, and a synchronous drive component.

[0007] A two-way slide rail is installed at the bottom of the lifting plate, and the two-way slide rail has two movable plates that are close to or far apart from each other;

[0008] The wire frame positioning assembly is provided in pairs and mirrored on two movable plates. The wire frame positioning assembly includes an inverted U-shaped positioning frame for receiving the wire frame and multiple clamping blocks for positioning the top of the wire frame. The clamping blocks are equidistantly distributed along the length of the inverted U-shaped positioning frame.

[0009] The synchronous drive component is located at the bottom of the lifting plate and is used to drive all the clamping blocks in the two frame positioning components to position the top of the frame.

[0010] Preferably, the wire frame positioning assembly further includes a cover plate, a horizontal moving block, and a vertical moving block;

[0011] The cover plate is set on the top of the U-shaped positioning frame and forms a receiving cavity with an opening on one side;

[0012] The vertical moving block is horizontally positioned in the receiving cavity along the horizontal direction of the C-shaped positioning frame. The bottom of the vertical moving block is provided with a first guide post corresponding to each clamping block. The first guide post passes through the top of the C-shaped positioning frame and connects to the top of the corresponding clamping block. A first spring is sleeved on the outside of the first guide post. The two ends of the first spring abut against the top of the vertical moving block and the C-shaped positioning frame, respectively.

[0013] The horizontal moving block is located in the receiving cavity and is parallel to the vertical moving block. The receiving cavity is provided with a transmission component for driving the horizontal moving block to move in the direction of the vertical moving block. The internal part of the transmission component is connected to the synchronous drive component. The side of the horizontal moving block near the vertical moving block is provided with a first arc surface, and the side of the vertical moving block near the horizontal moving block is provided with a second arc surface that slides in cooperation with the first arc surface.

[0014] Preferably, the inner side of the C-shaped positioning frame is provided with a first rectangular groove for the clamping block to move vertically, one side of the clamping block is provided with a first limiting slider, and the inner wall of the first rectangular groove is provided with a first limiting groove for the first limiting slider to move vertically.

[0015] Preferably, the transmission assembly includes a driven shaft, a rack, and a gear;

[0016] The driven shaft is horizontally positioned inside the receiving cavity. The driven shaft is located near the opening of the receiving cavity. Both ends of the driven shaft are axially connected to the two sides of the cover plate, and one end of the driven shaft is close to the moving plate. The end of the driven shaft close to the moving plate is connected to the synchronous drive assembly for transmission.

[0017] Multiple gears are provided and are evenly distributed on the driven shaft along the axis of the driven shaft;

[0018] The number of racks is the same as the number of gears and they are arranged one-to-one on one side of the horizontal moving block. A second limiting slider is provided on the top of the rack, and a second limiting groove is provided on the cover plate for the second limiting slider to move horizontally.

[0019] Preferably, the synchronous drive assembly includes a stepper motor, a drive shaft, a first bevel gear, and a second bevel gear;

[0020] The drive bearing is horizontally positioned between the two mesh frame positioning components, and the drive shaft is close to and parallel to the bidirectional slide rail. Connecting plates are provided on both sides of the lifting plate, and the two ends of the drive shaft are respectively connected to the connecting plates.

[0021] The number of first conical teeth is the same as the number of mesh frame positioning components and corresponds one-to-one. A through hole is provided at the center of the first conical tooth, and a connecting sleeve is provided in the through hole. One end of the connecting sleeve extends out of the through hole of the first conical tooth and is connected to an L-shaped fixing plate. The L-shaped fixing plate is provided on one side of the corresponding cover plate.

[0022] The drive shaft is provided with a strip-shaped limiting member along its axis on its exterior, and the inner ring of the connecting sleeve is provided with a strip-shaped limiting groove that can move along the strip-shaped limiting member.

[0023] The number of the second bevel teeth is the same as the number of the mesh frame positioning components and corresponds one-to-one. The second bevel teeth are coaxially arranged at one end of the driven shaft, and the second bevel teeth are meshed with the first bevel teeth.

[0024] The stepper motor is located on one side of the lifting plate, and the output shaft of the stepper motor is connected to one end of the drive shaft.

[0025] Preferably, the inner side of the C-shaped positioning frame is provided with a side positioning block that can press one side of the mesh frame tightly. The C-shaped positioning frame is provided with a second rectangular groove for the side positioning block to move horizontally. One side of the side positioning block is connected to a plurality of second guide posts that are equidistantly distributed along the length direction of the side positioning block. The end of the second guide post away from the side positioning block extends outward through the C-shaped positioning frame for a certain distance. The extended end of the second guide post is provided with an axial limiting sleeve. The outside of the second guide post is fitted with a second spring. The two ends of the second spring abut against the side wall of the side positioning block and the inner side wall of the second rectangular groove, respectively.

[0026] Preferably, the bottom of the side positioning block is provided with a third limiting slider, and the inner bottom of the C-shaped positioning frame is provided with a third limiting groove for the third limiting slider to move horizontally.

[0027] Preferably, one side of the side positioning block and the clamping block are respectively provided with an industrial rubber pad that can contact the surface of the wire frame.

[0028] The advantages of this utility model compared to the prior art are:

[0029] 1. The synchronous drive component drives the clamping blocks that are equidistantly distributed along the length of the C-shaped positioning frame on each moving plate to move synchronously through the transmission mechanism, pressing and positioning the top of the mesh frame, thus solving the problems of high cost and complex structure.

[0030] 2. The transmission component drives the horizontal moving block to move in the direction of the vertical moving block. The first arc surface of the horizontal moving block slides and engages with the second arc surface of the vertical moving block, converting the horizontal movement into the downward displacement of the vertical moving block. Then, the clamping block is driven by the first guide post to press down on the top of the mesh frame to achieve positioning, thus solving the problem of uneven force distribution. Attached Figure Description

[0031] Figure 1 This is a partial three-dimensional structural diagram of a circuit board solder paste printing machine. Figure 1 .

[0032] Figure 2 This is a partial three-dimensional structural diagram of a circuit board solder paste printing machine. Figure 2 .

[0033] Figure 3 This is a partial three-dimensional structural diagram of the screen frame fixing mechanism of a circuit board solder paste printing machine. Figure 1 .

[0034] Figure 4 This is a partial three-dimensional structural diagram of the screen frame fixing mechanism of a circuit board solder paste printing machine. Figure 2 .

[0035] Figure 5 This is a partial cross-sectional view of the frame positioning component of a circuit board solder paste printing machine.

[0036] Figure 6 This is a partial three-dimensional cross-sectional view of the frame positioning component of a circuit board solder paste printing machine.

[0037] Figure 7 This is a partial 3D view of a screen frame positioning component for a circuit board solder paste printing machine.

[0038] Figure 8 This is a partially exploded view of the frame positioning component of a circuit board solder paste printing machine.

[0039] The diagram is labeled as follows: 1. Frame; 2. Lifting mechanism; 21. Lifting plate; 3. Horizontal moving mechanism; 4. Scraper mechanism; 5. Frame fixing mechanism; 51. Bidirectional slide rail; 511. Moving plate; 52. Frame positioning assembly; 521. C-shaped positioning frame; 5211. First rectangular groove; 5212. Second rectangular groove; 522. Clamping block; 5221. First limiting slider; 5222. First limiting slide groove; 523. Cover plate; 5231. Receiving cavity; 524. Horizontal moving block; 5241. First arc surface; 525. Vertical moving block; 5251. First guide post; 5252. First spring; 5253. Second arc surface; 526. Transmission assembly; 5261, driven shaft; 5262, rack; 52621, second limiting slider; 52622, second limiting groove; 5263, gear; 53, synchronous drive assembly; 531, stepper motor; 532, drive shaft; 5321, strip-shaped limiting component; 533, first bevel gear; 5331, connecting sleeve; 53311, strip-shaped limiting groove; 5332, L-shaped fixing plate; 534, second bevel gear; 535, connecting plate; 6, mesh frame; 7, side positioning block; 71, second guide post; 711, axial limiting sleeve; 712, second spring; 72, third limiting slider; 73, third limiting groove; 74, industrial rubber pad. Detailed Implementation

[0040] To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments.

[0041] Reference Figures 1 to 3 As shown: A circuit board solder paste printing machine includes a frame 1, a lifting mechanism 2 is provided on the frame 1, the lifting mechanism 2 includes a lifting plate 21, a horizontal moving mechanism 3 is provided on the lifting plate 21, a scraper mechanism 4 is provided at the working end of the horizontal moving mechanism 3, and a wire frame fixing mechanism 5 is provided at the bottom of the lifting plate 21. The wire frame fixing mechanism 5 includes a bidirectional slide rail 51, a wire frame positioning component 52 and a synchronous drive component 53.

[0042] The bidirectional slide rail 51 is located at the bottom of the lifting plate 21, and the bidirectional slide rail 51 has two movable plates 511 that are close to or far apart from each other.

[0043] The wire frame positioning component 52 is provided in pairs and mirrored on the two movable plates 511. The wire frame positioning component 52 includes an incline positioning frame 521 for receiving the wire frame 6 and a plurality of clamping blocks 522 for positioning the top of the wire frame 6. The clamping blocks 522 are equidistantly distributed along the length direction of the incline positioning frame 521.

[0044] The synchronous drive component 53 is located at the bottom of the lifting plate 21 and is used to drive all the clamping blocks 522 in the two mesh frame positioning components 52 to position the top of the mesh frame 6.

[0045] The stencil frame 6 of the circuit board solder paste printing machine is usually fixed by multiple cylinders. The large number of cylinders leads to high hardware costs, and the supporting air circuit system increases the installation and maintenance costs. When multiple cylinders are driven independently, if one cylinder has insufficient air pressure, seal failure, or mechanical jamming, it is easy to cause the clamping blocks to be not synchronized, resulting in uneven force on the stencil frame 6, deformation, and affecting the printing accuracy.

[0046] When the circuit board solder paste printing machine is working, the synchronous drive component 53 drives the two moving plates 511 of the bidirectional slide rail 51 to move closer or further away along the guide rail to adjust the spacing, so that the C-shaped positioning frame 521 mirrored on the moving plate 511 supports the bottom of the stencil frame 6. At the same time, the synchronous drive component 53 drives the clamping blocks 522, which are equidistantly distributed along the length direction of the C-shaped positioning frame 521 on each moving plate 511, to move synchronously, pressing and positioning the top of the stencil frame 6, so as to achieve stable fixation of the stencil frame 6, so that the subsequent lifting mechanism 2 can drive the stencil frame 6 to bond with the PCB and the squeegee mechanism 4 can perform solder paste printing.

[0047] The lifting mechanism 2, the horizontal moving mechanism 3, and the scraper mechanism 4 in this application are all prior art and will not be described in detail here.

[0048] Reference Figure 1 , Figure 5 , Figure 6 and Figure 8 As shown: The wire frame positioning assembly 52 also includes a cover plate 523, a horizontal moving block 524, and a vertical moving block 525;

[0049] The cover plate 523 is disposed on the top of the U-shaped positioning frame 521 and forms a receiving cavity 5231 with an opening on one side;

[0050] The vertical moving block is horizontally positioned in the receiving cavity 5231 along the horizontal direction of the C-shaped positioning frame 521. The bottom of the vertical moving block is provided with a first guide post 5251 corresponding to each clamping block 522. The first guide post 5251 passes through the top of the C-shaped positioning frame 521 and is connected to the top of the corresponding clamping block 522. A first spring 5252 is sleeved on the outside of the first guide post 5251. The two ends of the first spring 5252 abut against the top of the vertical moving block and the C-shaped positioning frame 521, respectively.

[0051] A horizontal moving block 524 is disposed in a receiving cavity 5231 and is parallel to a vertical moving block. A transmission assembly 526 for driving the horizontal moving block 524 to move in the direction of the vertical moving block is disposed in the receiving cavity 5231. The interior of the transmission assembly 526 is connected to the synchronous drive assembly 53. A first arc surface 5241 is provided on the side of the horizontal moving block 524 near the vertical moving block, and a second arc surface 5253 that slides with the first arc surface 5241 is provided on the side of the vertical moving block near the horizontal moving block 524.

[0052] When the mesh frame positioning component 52 is working, the synchronous drive component 53 drives the transmission component 526 to work. The transmission component 526 drives the horizontal moving block 524 to move in the direction of the vertical moving block. The first arc surface 5241 of the horizontal moving block 524 slides and engages with the second arc surface 5253 of the vertical moving block, converting the horizontal movement into the downward displacement of the vertical moving block. Then, the clamping block 522 is driven down by the first guide post 5251 to achieve positioning. At this time, the first spring 5252 is compressed and stored. When the transmission component 526 drives in the opposite direction, the first spring 5252 resets and pushes the vertical moving block to move the clamping block 522 up to release the mesh frame 6.

[0053] Reference Figure 5 and Figure 7 As shown: The inner side of the C-shaped positioning frame 521 is provided with a first rectangular groove 5211 for the clamping block 522 to move vertically, and a first limiting slider 5221 is provided on one side of the clamping block 522. The inner wall of the first rectangular groove 5211 is provided with a first limiting groove 5222 for the first limiting slider 5221 to move vertically.

[0054] When the vertical moving block drives the clamping block 522 to press down or lift up through the guide post, the limiting slider slides in the limiting groove in the vertical direction, restricting the lateral displacement of the clamping block 522 and ensuring that it only moves in the vertical direction. This avoids the clamping block 522 from being deflected due to the lateral force during arc surface transmission, thereby ensuring the verticality and synchronization of the clamping block 522 pressing the top of the mesh frame 6, and improving the positioning accuracy and structural stability of the mesh frame 6.

[0055] Reference Figure 5 , Figure 6 and Figure 8 As shown: the transmission assembly 526 includes a driven shaft 5261, a rack 5262, and a gear 5263;

[0056] Driven shaft 5261 is horizontally disposed in receiving cavity 5231. Driven shaft 5261 is close to the opening of receiving cavity 5231. Both ends of driven shaft 5261 are axially connected to the two sides of cover plate 523 respectively. One end of driven shaft 5261 is close to moving plate 511. The end of driven shaft 5261 close to moving plate 511 is connected to synchronous drive assembly 53 for transmission.

[0057] Multiple gears 5263 are provided and are evenly distributed on the driven shaft 5261 along the axis of the driven shaft 5261;

[0058] The number of racks 5262 is the same as the number of gears 5263 and they are arranged one-to-one on one side of the horizontal moving block 524. The top of the rack 5262 is provided with a second limiting slider 52621, and the cover plate 523 is provided with a second limiting groove 52622 for the second limiting slider 52621 to move horizontally.

[0059] The synchronous drive assembly 53 outputs rotational power to drive the driven shaft 5261 to rotate. Multiple gears 5263, which are evenly spaced along the axial direction on the driven shaft 5261, rotate synchronously. Through meshing with the rack 5262 on one side of the horizontal moving block 524, the rotational motion is converted into the linear motion of the horizontal moving block 524. The second limiting slider 52621 at the top of the horizontal moving block 524 slides and guides within the second limiting groove 52622 of the cover plate 523, so that the horizontal moving block 524 moves stably in the horizontal direction. Then, through the cooperation of the first arc surface 5241 and the second arc surface 5253 of the vertical moving block, the vertical moving block and the clamping block 522 are pushed to move up and down, thereby clamping or releasing the mesh frame 6.

[0060] Reference Figure 1 , Figure 3 , Figure 4 , Figure 6 and Figure 8 As shown: The synchronous drive assembly 53 includes a stepper motor 531, a drive shaft 532, a first bevel gear 533, and a second bevel gear 534;

[0061] The drive shaft 532 is horizontally positioned between the two mesh frame positioning components 52, and the drive shaft 532 is close to and parallel to the bidirectional slide rail 51. Connecting plates 535 are provided on both sides of the lifting plate 21, and the two ends of the drive shaft 532 are respectively connected to the connecting plates 535.

[0062] The number of first conical teeth 533 is the same as the number of mesh frame positioning components 52 and they correspond one-to-one. A through hole is provided at the center of the first conical teeth 533. A connecting sleeve 5331 is provided in the through hole. One end of the connecting sleeve 5331 extends out of the through hole of the first conical teeth 533 and is connected to an L-shaped fixing plate 5332. The L-shaped fixing plate 5332 is provided on one side of the corresponding cover plate 523.

[0063] A strip-shaped limiting member 5321 is provided on the outside of the drive shaft 532 along its axis, and a strip-shaped limiting groove 53311 is provided on the inner ring of the connecting sleeve 5331, which can move along the strip-shaped limiting member 5321.

[0064] The number of second bevel teeth 534 is the same as the number of mesh frame positioning components 52 and corresponds one-to-one. The second bevel teeth 534 are coaxially arranged at one end of the driven shaft 5261, and the second bevel teeth 534 are meshed with the first bevel teeth 533.

[0065] Stepper motor 531 is located on one side of lifting plate 21, and the output shaft of stepper motor 531 is connected to one end of drive shaft 532.

[0066] Stepper motor 531 drives drive shaft 532 to rotate. Drive shaft 532 rotates synchronously through the cooperation of external strip limit member 5321 and inner ring strip limit groove 53311 of connecting sleeve 5331. The first bevel tooth 533 sleeved on drive shaft 532 rotates synchronously. The first bevel tooth 533 meshes with the second bevel tooth 534 at the end of driven shaft 5261, driving driven shaft 5261 to rotate. Then, through transmission component 526, the horizontal moving block 524 drives the clamping block 522 to move. When bidirectional slide rail 51 adjusts the distance between the two mesh frame positioning components 52, connecting sleeve 5331 can slide along the axial direction of drive shaft 532. Through the cooperation of strip limit member 5321 and limit groove, it ensures that the change in distance does not affect the power transmission of drive shaft 532 to first bevel tooth 533, realizing synchronous control of clamping block 522 in the two mesh frame positioning components 52.

[0067] Reference Figure 5 Only Figure 7 As shown: The inner side of the C-shaped positioning frame 521 is provided with a side positioning block 7 that can press one side of the mesh frame 6. The C-shaped positioning frame 521 is provided with a second rectangular groove 5212 for the side positioning block 7 to move horizontally. One side of the side positioning block 7 is connected to a plurality of second guide posts 71 that are equidistantly distributed along the length direction of the side positioning block 7. The end of the second guide post 71 away from the side positioning block 7 extends outward through the C-shaped positioning frame 521 for a certain distance. The extended end of the second guide post 71 is provided with an axial limiting sleeve 711. The outside of the second guide post 71 is fitted with a second spring 712. The two ends of the second spring 712 abut against the side wall of the side positioning block 7 and the inner side wall of the second rectangular groove 5212, respectively.

[0068] When the mesh frame 6 is placed in the U-shaped positioning frame 521, the side positioning block 7 is first squeezed to move horizontally along the second rectangular groove 5212, compressing the second spring 712. The second guide post 71 moves with the side positioning block 7, and the axial limiting sleeve 711 prevents it from coming out. After the second spring 712 is compressed, it generates a reverse elastic force, which presses one side of the mesh frame 6 through the side positioning block 7, realizing the lateral positioning of the mesh frame 6 in the U-shaped positioning frame 521. The multiple equidistantly distributed second guide posts 71 and second springs 712 ensure that the side positioning block 7 is subjected to uniform force, stably presses the mesh frame 6, and the elastic pressing can adapt to the size error of the mesh frame 6.

[0069] Reference Figure 7 As shown: The bottom of the side positioning block 7 is provided with a third limiting slider 72, and the inner bottom of the C-shaped positioning frame 521 is provided with a third limiting groove 73 for the third limiting slider 72 to move horizontally.

[0070] When the side positioning block 7 is squeezed by the mesh frame 6 or moves horizontally under the elastic force of the second spring 712, the third limiting slider 72 moves horizontally within the third limiting groove 73, restricting the vertical displacement and flipping of the side positioning block 7, ensuring its stable movement in the horizontal direction. Together with the second guide post 71 and the second spring 712, it achieves stable and elastic compression of the mesh frame 6 in the side.

[0071] Reference Figure 6 As shown: Industrial rubber pads 74 that can contact the surface of the wire frame 6 are respectively provided on one side of the side positioning block 7 and the clamping block 522.

[0072] When the industrial rubber pads 74 on the side positioning block 7 and the clamping block 522 come into contact with the surface of the wire mesh frame 6, the elastic deformation of the industrial rubber pads 74 fills the tiny gaps on the surface of the wire mesh frame 6, increases the friction to prevent the wire mesh frame 6 from sliding, and at the same time buffers the rigid clamping force to avoid damage to the wire mesh frame 6. The flexible contact of the industrial rubber pads 74 achieves stable clamping and protection of the wire mesh frame 6.

[0073] The above embodiments only illustrate one or more implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A circuit board solder paste printing machine, comprising a frame (1), a lifting mechanism (2) provided on the frame (1), the lifting mechanism (2) comprising a lifting plate (21), a horizontal moving mechanism (3) provided on the lifting plate (21), a scraper mechanism (4) provided at the working end of the horizontal moving mechanism (3), and a wire frame fixing mechanism (5) provided at the bottom of the lifting plate (21), characterized in that, The wire frame fixing mechanism (5) includes a two-way slide rail (51), a wire frame positioning component (52), and a synchronous drive component (53). A two-way slide rail (51) is provided at the bottom of the lifting plate (21), and the two-way slide rail (51) is provided with two movable plates (511) that are close to or far apart from each other. The frame positioning assembly (52) is provided in pairs and mirrored on two movable plates (511). The frame positioning assembly (52) includes an incline positioning frame (521) for receiving the frame (6) and a plurality of clamping blocks (522) for positioning the top of the frame (6). The clamping blocks (522) are equidistantly distributed along the length of the incline positioning frame (521). The synchronous drive assembly (53) is located at the bottom of the lifting plate (21) and is used to drive all the clamping blocks (522) in the two mesh frame positioning assemblies (52) to position the top of the mesh frame (6).

2. The circuit board solder paste printing machine according to claim 1, characterized in that, The wire frame positioning assembly (52) also includes a cover plate (523), a horizontal moving block (524), and a vertical moving block (525); The cover plate (523) is disposed on the top of the U-shaped positioning frame (521) and forms a receiving cavity (5231) with an opening on one side. The vertical moving block is horizontally positioned in the receiving cavity (5231) along the horizontal direction of the U-shaped positioning frame (521). The bottom of the vertical moving block is provided with a first guide post (5251) corresponding to each clamping block (522). The first guide post (5251) passes through the top of the U-shaped positioning frame (521) and is connected to the top of the corresponding clamping block (522). A first spring (5252) is sleeved on the outside of the first guide post (5251). The two ends of the first spring (5252) abut against the top of the vertical moving block and the U-shaped positioning frame (521) respectively. A horizontal moving block (524) is disposed in a receiving cavity (5231) and is parallel to a vertical moving block. A transmission assembly (526) for driving the horizontal moving block (524) to move in the direction of the vertical moving block is provided in the receiving cavity (5231). The interior of the transmission assembly (526) is connected to the synchronous drive assembly (53). A first arc surface (5241) is provided on the side of the horizontal moving block (524) near the vertical moving block, and a second arc surface (5253) is provided on the side of the vertical moving block near the horizontal moving block (524) to slide in cooperation with the first arc surface (5241).

3. A circuit board solder paste printing machine according to claim 2, characterized in that, The inner side of the C-shaped positioning frame (521) is provided with a first rectangular groove (5211) for the clamping block (522) to move vertically, and a first limiting slider (5221) is provided on one side of the clamping block (522). The inner wall of the first rectangular groove (5211) is provided with a first limiting slide groove (5222) for the first limiting slider (5221) to move vertically.

4. A circuit board solder paste printing machine according to claim 2, characterized in that, The transmission assembly (526) includes a driven shaft (5261), a rack (5262), and a gear (5263); The driven shaft (5261) is horizontally disposed in the receiving cavity (5231). The driven shaft (5261) is close to the opening of the receiving cavity (5231). Both ends of the driven shaft (5261) are axially connected to the two sides of the cover plate (523). One end of the driven shaft (5261) is close to the moving plate (511). The end of the driven shaft (5261) close to the moving plate (511) is connected to the synchronous drive assembly (53) for transmission. Multiple gears (5263) are provided and are evenly distributed on the driven shaft (5261) along the axis of the driven shaft (5261); The number of racks (5262) ​​is the same as the number of gears (5263) and they are arranged one-to-one on one side of the horizontal moving block (524). The top of the rack (5262) ​​is provided with a second limiting slider (52621), and the cover plate (523) is provided with a second limiting groove (52622) for the second limiting slider (52621) to move horizontally.

5. A circuit board solder paste printing machine according to claim 4, characterized in that, The synchronous drive assembly (53) includes a stepper motor (531), a drive shaft (532), a first bevel gear (533), and a second bevel gear (534); The drive shaft (532) is horizontally positioned between the two mesh frame positioning components (52), and the drive shaft (532) is close to and parallel to the bidirectional slide rail (51). Connecting plates (535) are provided on both sides of the lifting plate (21), and the two ends of the drive shaft (532) are respectively connected to the connecting plates (535). The number of first conical teeth (533) is the same as the number of mesh frame positioning components (52) and they correspond one-to-one. A through hole is provided at the center of the first conical teeth (533), and a connecting sleeve (5331) is provided in the through hole. One end of the connecting sleeve (5331) extends out of the through hole of the first conical teeth (533) and is connected to an L-shaped fixing plate (5332). The L-shaped fixing plate (5332) is provided on one side of the corresponding cover plate (523). The drive shaft (532) is provided with a strip-shaped limiting member (5321) along its axis on the outside, and the inner ring of the connecting sleeve (5331) is provided with a strip-shaped limiting groove (53311) that can move along the strip-shaped limiting member (5321). The number of the second bevel teeth (534) is the same as the number of the mesh frame positioning components (52) and they correspond one-to-one. The second bevel teeth (534) are coaxially arranged at one end of the driven shaft (5261), and the second bevel teeth (534) are meshed with the first bevel teeth (533). A stepper motor (531) is located on one side of the lifting plate (21), and the output shaft of the stepper motor (531) is connected to one end of the drive shaft (532) for transmission.

6. A circuit board solder paste printing machine according to claim 1, characterized in that, The inner side of the C-shaped positioning frame (521) is provided with a side positioning block (7) that can press one side of the mesh frame (6). The C-shaped positioning frame (521) is provided with a second rectangular groove (5212) for the side positioning block (7) to move horizontally. One side of the side positioning block (7) is connected to a plurality of second guide posts (71) that are equidistantly distributed along the length direction of the side positioning block (7). The end of the second guide post (71) away from the side positioning block (7) extends outward through the C-shaped positioning frame (521) for a certain distance. The extended end of the second guide post (71) is provided with an axial limiting sleeve (711). The outside of the second guide post (71) is provided with a second spring (712). The two ends of the second spring (712) abut against the side wall of the side positioning block (7) and the inner side wall of the second rectangular groove (5212), respectively.

7. A circuit board solder paste printing machine according to claim 6, characterized in that, The bottom of the side positioning block (7) is provided with a third limiting slider (72), and the inner bottom of the C-shaped positioning frame (521) is provided with a third limiting groove (73) for the third limiting slider (72) to move.

8. A circuit board solder paste printing machine according to claim 6, characterized in that, The side positioning block (7) and the clamping block (522) are respectively provided with industrial rubber pads (74) that can contact the surface of the wire frame (6).

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