A quantitative dispensing device for PCB circuit boards

Abstract

The present invention relates to the field of dispensing technology, and in particular to a quantitative dispensing device for PCB circuit boards, comprising a device body, a rotating motor fixedly mounted on the dispensing assembly of the device body, a lifting cylinder fixedly mounted on the output shaft of the rotating motor, a cross arm fixedly mounted on the output shaft of the lifting cylinder, and a needle cleaner fixedly mounted on the cross arm; the needle cleaner comprises a fixed disk, the fixed disk is fixedly connected to the cross arm, a rotating disk is arranged above the fixed disk, a driving motor is fixedly mounted on the lower surface of the fixed disk, the output shaft of the driving motor is coaxially fixedly connected to the rotating disk, a plurality of extrusion columns are fixed on the rotating disk, a cleaning belt is wound around each extrusion column, and both ends of the cleaning belt are connected to a retracting device. The present invention is provided with a cleaner, and after the dispensing is completed, the cleaner can be used to realize automatic cleaning of the dispensing needle tube needle, thereby avoiding excessive residual colloid near the needle and ensuring the normal quantitative dispensing function of the dispensing machine.

Description

Technical Field

[0001] The invention relates to the technical field of glue dispensing, and in particular to a quantitative glue dispensing device for a PCB circuit board. Background Art

[0002] Glue dispensing refers to the process of applying specific glue accurately to a specific position on a PCB board through a glue dispensing device, which can fix components and prevent components from loosening. Commonly used glue dispensing devices include automatic glue dispensing machines. In order to avoid excessive glue extrusion during the glue dispensing process, existing automatic glue dispensing machines are equipped with a glue flow control structure composed of a solenoid valve, a metering pump, etc. to achieve a quantitative glue dispensing function. However, during the use of such a glue dispensing machine, due to the glue dispensing process near the glue dispensing needle, some glue will remain on the surface of the needle tube at the edge of the needle outlet due to its own viscosity after being squeezed out of the needle. As the glue dispensing process continues, these residual colloids will accumulate more and more. If not handled in time, the residual glue near the needle will gradually solidify and sag under the action of gravity, hindering the glue discharge of the needle, affecting the normal glue discharge of the needle, making the glue discharge amount of the needle unstable, and interfering with the normal quantitative function. The existing method is mainly to wipe the needle with a non-woven fabric manually after completing a certain amount of glue dispensing operations, which is inefficient and affects production efficiency. Summary of the invention

[0003] The purpose of the present invention is to solve the problem in the prior art that residual glue on the outer surface of the needle solidifies, resulting in unstable glue output from the needle, and to propose a quantitative glue dispensing device for PCB circuit boards.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A quantitative dispensing device for PCB circuit boards is designed, comprising a device body, a rotating motor is fixedly mounted on the dispensing component of the device body, a lifting cylinder is fixedly mounted on the output shaft of the rotating motor, a cross arm is fixedly mounted on the output shaft of the lifting cylinder, a needle cleaner is fixedly mounted on one end of the dispensing needle tube close to the device body on the cross arm, and the needle cleaner is arranged correspondingly to the dispensing needle tube of the device body; The needle cleaner includes a fixed disk, a rotating disk, a driving motor, a plurality of extrusion columns, a plurality of cleaning belts, and a retracting device. The fixed disk is fixedly connected to the cross arm, a rotating disk is arranged above the fixed disk, a driving motor is fixedly installed on the lower surface of the fixed disk, the output shaft of the driving motor is coaxially fixedly connected to the rotating disk, a plurality of extrusion columns are fixed on the rotating disk around its axis, a cleaning belt is wound around each of the extrusion columns, both ends of the cleaning belt are connected to the retracting device, and the retracting device is used to drive the cleaning belt to move on the surface of the extrusion column.

[0005] Preferably, the retracting and releasing device comprises a fixing ring, a plurality of supporting rods, a plurality of first vertical shafts, a plurality of first pulleys, a plurality of second vertical shafts, a plurality of second pulleys, and a plurality of connecting plates. A fixing ring is coaxially arranged above the rotating disk, and the extrusion columns are all placed in the fixing ring. The fixing ring is fixedly connected to the fixing disk through a plurality of supporting rods. A first vertical shaft is arranged between each of the extrusion columns and the fixing ring. The first vertical shaft is arranged parallel to the central axis of the fixing ring. The bottom end of the first vertical shaft is fixedly connected to the rotating disk. A first pulley is coaxially rotated on the first vertical shaft. A plurality of second pulleys are circumferentially arranged on the outer edge of the fixing ring. The second pulleys are arranged one-to-one with the first pulley. A second vertical shaft is coaxially rotated on the second pulley. The second vertical shaft is fixedly connected to the top end of the first vertical shaft by a connecting plate. Two ends of the cleaning belt on each of the extrusion columns are fixedly wound on the first pulley and the second pulley respectively. An inner gear ring is coaxially fixed in the fixing ring. A gear is coaxially fixed on each of the first pulleys, and the gears are meshed with the inner gear ring.

[0006] Preferably, an inner cavity is provided in the extrusion column, an arc-shaped opening is provided on the extrusion column on one side facing the central axis of the fixing ring, the arc-shaped opening is connected with the inner cavity, the arc-shaped opening is covered and fixed with an arc-shaped skin, and a plurality of air holes are provided through the arc-shaped skin; A friction block is correspondingly arranged between each of the first vertical shafts and the fixed ring. The friction block contacts the inner wall of the fixed ring. A liquid storage cavity is opened in the friction block. The liquid storage cavity stores cleaning liquid. The liquid storage cavity is connected to the inner cavity through a pipeline. The friction block is connected to the first vertical shaft.

[0007] Preferably, a first tube body is fixedly passed through the first vertical axis, the outer end of the first tube body is connected with the inner cavity, a second tube body is coaxially inserted with the outer end of the first tube body, the second tube body is connected with the liquid storage cavity, and a compression spring is sleeved on the second tube body between the outer end of the first tube body and the friction block, and the two ends of the compression spring are respectively fixedly connected to the friction block and the first vertical axis.

[0008] Preferably, the arc-shaped skin is made of a highly elastic rubber material.

[0009] Preferably, the friction block is in an arc shape as a whole and is made of metal.

[0010] Preferably, the cleaning belt is made of breathable non-woven fabric.

[0011] The quantitative dispensing device for PCB circuit boards proposed by the present invention has the following beneficial effects: By providing a cleaner composed of a driving motor, an extrusion column, a cleaning belt, etc., the cleaner can be automatically put on the needle after the dispensing is completed. After the driving motor is started, multiple extrusion columns rotate synchronously around the surface of the needle, so that the cleaning belt on the extrusion column and the surface of the needle are wiped and cleaned, thereby realizing automatic cleaning of the needle; By providing a retractable device adapted to the cleaning belt, the retractable device utilizes a planetary gear system composed of a plurality of gears on an inner ring, so that each first pulley can realize the retractable work of the cleaning belt by self-rotation while revolving, thereby continuously delivering a new cleaning belt to the vicinity of the needle surface, thereby achieving a better cleaning effect; By providing friction bodies and the like, a motor is used to synchronously drive multiple friction bodies to rub against a fixed ring, and the heat generated by the friction is used to cause the cleaning liquid to evaporate and generate steam, and the steam is used to spray the cleaning belt to dissolve the stubborn colloid. By providing an arc-shaped skin, since the arc-shaped skin itself has good deformation ability, when the air pressure in the inner cavity increases, the arc-shaped skin will expand and bulge outward, thereby pushing the cleaning belt on the surface of the extrusion column to be squeezed toward the surface of the needle, so that the cleaning belt can wipe the surface of the needle with greater force. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic diagram of the structure of a quantitative dispensing device for PCB circuit boards proposed by the present invention Figure 1 ; Figure 2 A schematic diagram of the structure of a quantitative dispensing device for PCB circuit boards proposed by the present invention Figure 2 ; Figure 3 A schematic diagram of a cleaner structure of a quantitative dispensing device for PCB circuit boards proposed by the present invention Figure 1 ; Figure 4 A schematic diagram of a cleaner structure of a quantitative dispensing device for PCB circuit boards proposed by the present invention Figure 2 ; Figure 5 A schematic diagram of the main structure of a cleaner for a quantitative dispensing device for a PCB circuit board proposed by the present invention; Figure 6 A schematic diagram of the partial structure of a cleaner for a quantitative dispensing device for a PCB circuit board proposed by the present invention; Figure 7 A schematic diagram of the meshing structure of a gear and a gear ring of a quantitative dispensing device for a PCB circuit board proposed by the present invention; Figure 8 This is a schematic diagram of the structure of a first vertical axis, an extrusion column, and a friction block of a quantitative dispensing device for a PCB circuit board proposed by the present invention; Fig. 9 This is a schematic diagram of the first vertical axis and extrusion column structure of a quantitative dispensing device for a PCB circuit board proposed by the present invention; Fig.10 This is a schematic diagram of the cross-sectional structure of the first vertical axis and the extrusion column of a quantitative dispensing device for a PCB circuit board proposed by the present invention; Fig.11 A schematic diagram of the working state of a cleaner of a quantitative glue dispensing device for a PCB circuit board proposed by the present invention.

[0013] In the figure: 1. Equipment body; 2. Rotating motor; 3. Lifting cylinder; 4. Cross arm; 5. Cleaner; 51. Fixed disk; 52. Support rod; 53. Fixed ring; 54. Driving motor; 55. Rotating disk; 56. First vertical axis; 57. First pulley; 58. Connecting plate; 59. Second vertical axis; 510. Second pulley; 511. Extrusion column; 512. Cleaning belt; 513. Gear; 514. Friction block; 515. First tube body; 516. Liquid storage chamber; 517. Second tube body; 518. Inner cavity; 519. Arc opening; 520. Arc skin; 521. Air vent; 522. Inner gear ring; 6. Glue dispensing needle tube. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0015] Example 1: Reference Figure 1 - Figure 7 , Fig.11 A quantitative glue dispensing device for PCB circuit boards, comprising a device body 1, a rotating motor 2 is fixedly mounted on the glue dispensing component of the device body 1, a lifting cylinder 3 is fixedly mounted on the output shaft of the rotating motor 2, a cross arm 4 is fixedly mounted on the output shaft of the lifting cylinder 3, a needle cleaner 5 is fixedly mounted on one end of a glue dispensing needle tube 6 close to the device body 1 on the cross arm 4, and the needle cleaner 5 is arranged corresponding to the glue dispensing needle tube 6 of the device body 1; The needle cleaner 5 includes a fixed disk 51, a rotating disk 55, a driving motor 54, a plurality of extrusion columns 511, a plurality of cleaning belts 512, and a retracting device. The fixed disk 51 is fixedly connected to the cross arm 4. A rotating disk 55 is arranged above the fixed disk 51. The driving motor 54 is fixedly installed on the lower surface of the fixed disk 51. The output shaft of the driving motor 54 is coaxially fixedly connected to the rotating disk 55. A plurality of extrusion columns 511 are fixed on the rotating disk 55 around its central axis. A cleaning belt 512 is wound around each extrusion column 511. Both ends of the cleaning belt 512 are connected to the retracting device. The retracting device is used to drive the cleaning belt 512 to move on the surface of the extrusion column 511.

[0016] The retracting and unwinding device includes a fixed ring 53, a plurality of support rods 52, a plurality of first vertical shafts 56, a plurality of first pulleys 57, a plurality of second vertical shafts 59, a plurality of second pulleys 510, and a plurality of connecting plates 58. The fixed ring 53 is coaxially arranged above the rotating disk 55, and the extrusion columns 511 are all placed in the fixed ring 53. The fixed ring 53 is fixedly connected to the fixed disk 51 through a plurality of support rods 52. A first vertical shaft 56 is arranged between each extrusion column 511 and the fixed ring 53. The first vertical shaft 56 is arranged parallel to the central axis of the fixed ring 53. The bottom end of the first vertical shaft 56 is fixedly connected to the rotating disk 55. The first vertical shaft 56 is coaxially arranged on the first vertical shaft 56. A first pulley 57 is rotated, and a plurality of second pulleys 510 are arranged circumferentially on the outer edge of the fixed ring 53. The second pulleys 510 are arranged one by one with the first pulleys 57. A second vertical shaft 59 is coaxially rotated on each of the second pulleys 510. The second vertical shaft 59 is fixedly connected to the top of the first vertical shaft 56 through a connecting plate 58. The two ends of the cleaning belt 512 on each extrusion column 511 are respectively fixedly wound on the first pulley 57 and the second pulley 510. An inner gear ring 522 is coaxially fixed in the fixed ring 53. A gear 513 is coaxially fixed on each first pulley 57, and the gears 513 are meshed with the inner gear ring 522. The retracting and releasing device uses a planetary gear 513 system composed of an inner gear ring 522 and a plurality of gears 513, so that each first pulley 57 can realize the retracting and releasing of the cleaning belt 512 by self-rotation while revolving, thereby continuously delivering new cleaning belts 512 to the vicinity of the needle surface. The cleaning belt 512 is made of air-permeable nonwoven fabric.

[0017] Example 2: Reference Figure 8 - Fig.10 As another preferred embodiment of the present invention, the difference from Embodiment 1 lies in that an inner cavity 518 is provided in the extrusion column 511, and an arc-shaped opening 519 is provided on the extrusion column 511 on the side facing the central axis of the fixing ring 53, the arc-shaped opening 519 is connected with the inner cavity 518, and an arc-shaped skin 520 is covered and fixed on the arc-shaped opening 519, and a plurality of air holes 521 are provided through the arc-shaped skin 520; by providing the arc-shaped skin 520, since the arc-shaped skin 520 itself has good deformation ability, when the air pressure in the inner cavity 518 increases, the arc-shaped skin 520 will expand and bulge outward, thereby pushing the cleaning belt 512 on the surface of the extrusion column 511 to be squeezed toward the surface of the needle, so that the cleaning belt 512 has a stronger wiping force on the surface of the needle.

[0018] A friction block 514 is correspondingly arranged between each first vertical shaft 56 and the fixed ring 53. The friction block 514 contacts the inner wall of the fixed ring 53. A liquid storage cavity 516 is provided in the friction block 514. The liquid storage cavity 516 stores cleaning liquid. The liquid storage cavity 516 is connected to the inner cavity 518 through a pipeline. The friction block 514 is connected to the first vertical shaft 56. Simply relying on the wiping between the cleaning belt 512 and the pillow to remove the colloid is inefficient and has a poor effect. Therefore, the heat generated by friction is used to promote the evaporation of the cleaning liquid to generate steam, and the steam is used to spray the cleaning belt 512 to dissolve the stubborn colloid, and the cleaning effect is better. The cleaning liquid can be a cleaning liquid containing a small amount of ethanol, which is easy to evaporate and generate steam. At the same time, ethanol can also be used as a solvent to dissolve the colloid.

[0019] A first tube body 515 is fixedly passed through the first vertical shaft 56, the inner end of the first tube body 515 is communicated with the inner cavity 518, a second tube body 517 is coaxially inserted at the outer end of the first tube body 515, the second tube body 517 is communicated with the liquid storage cavity 516, and a compression spring is sleeved on the second tube body 517 between the outer end of the first tube body 515 and the friction block 514, and the two ends of the compression spring are respectively fixedly connected to the friction block 514 and the first vertical shaft 56. By providing the compression spring, when the friction block 514 rotates, the friction block 514 can always maintain close contact with the inner wall of the fixed ring 53 under the action of centrifugal force and the dual pressure of the compression spring, so that even if the friction block 514 is slightly worn, the gap between it and the inner wall of the fixed ring 53 will be automatically adjusted to ensure friction efficiency.

[0020] The arc-shaped skin 520 is made of a highly elastic rubber material. The friction block 514 is in an arc shape as a whole and is made of metal. The arc-shaped friction block 514 can obtain a larger friction area with the fixing ring 53, thereby generating heat more efficiently. At the same time, the friction block 514 made of metal can transfer the generated heat to the cleaning liquid in the liquid storage chamber 516 more quickly.

[0021] The overall workflow of the present invention is as follows: When the equipment completes a certain amount of PCB circuit board dispensing work, the equipment is stopped at this time, and then the rotary motor 2 is controlled to rotate so that the rotary motor 2 can drive the needle cleaner 5 on the cross arm 4 to rotate to just below the dispensing needle tube 6, and then the lifting cylinder 3 is controlled to drive the needle cleaner 5 on the cross arm 4 to move up until the cleaner 5 is sleeved on the needle of the dispensing needle tube 6. At this time, the status of the needle cleaner 5 and the dispensing needle tube 6 is as shown in the attached figure. Fig.11 As shown, the needle of the dispensing needle tube 6 is placed between a plurality of extrusion columns 511, and the cleaning belt 512 on the extrusion column 511 keeps in contact with the surface of the needle; Then, the driving motor 54 is started, and the driving motor 54 drives the rotating disk 55 to rotate. The rotating disk 55 synchronously drives the multiple squeezing columns 511, the first vertical shaft 56, and the second vertical shaft 59 to make circular motions. In the process of making circular motions, the cleaning belt 512 in front of each squeezing column 511 will wipe the surface of the needle head to wipe off the colloid on the surface of the needle head. At the same time, the gear 513 on each first pulley 57 will drive the first pulley 57 to rotate under the drive of the inner gear ring 522 on the fixed ring 53. When the first pulley 57 rotates, it will pull the cleaning belt 512, so that the cleaning belt 512 between the second pulley 510 and the first pulley 57 will move. In this way, the cleaning belt 512 dipped in colloid will be collected into the first pulley 57 during the wiping process, and the cleaning effect is better. In addition, the first vertical shaft 56 will also drive the friction body thereon to perform circular motion synchronously. While the friction body is moving, it will rub against the inner wall of the fixed ring 53. The rapid friction between the two will generate a large amount of heat, which will be transferred to the cleaning liquid in its liquid storage cavity 516 through the friction body. After the cleaning liquid is heated, it will generate steam, which will be input into the inner cavity 518 of the extrusion column 511 through the first tube body 515 and the second tube body 517, so that the gas pressure in the inner cavity 518 increases, thereby causing the arc skin 520 on the extrusion column 511 to expand. The expanded arc skin 520 will press the cleaning belt 512 against the surface of the pillow, so as to obtain a better wiping effect. At the same time, the steam in the inner cavity 518 will also be sprayed toward the cleaning belt 512 through the air holes 521 on the arc skin 520. Since the cleaning belt 512 is made of breathable non-woven fabric, the steam will not only moisten the cleaning belt 512, but also melt the stubborn colloid on the surface of the pillow.

[0022] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A quantitative dispensing device for a PCB circuit board, comprising a device body (1), characterized in that: A rotating motor (2) is fixedly mounted on the glue dispensing component of the device body (1); a lifting cylinder (3) is fixedly mounted on the output shaft of the rotating motor (2); a cross arm (4) is fixedly mounted on the output shaft of the lifting cylinder (3); a needle cleaner (5) is fixedly mounted on one end of the glue dispensing needle tube (6) close to the device body (1) on the cross arm (4); the needle cleaner (5) is arranged corresponding to the glue dispensing needle tube (6) of the device body (1); The needle cleaner (5) comprises a fixed disk (51), a rotating disk (55), a driving motor (54), a plurality of extrusion columns (511), a plurality of cleaning belts (512), and a retracting device. The fixed disk (51) is fixedly connected to the cross arm (4). A rotating disk (55) is arranged above the fixed disk (51). A driving motor (54) is fixedly mounted on the lower surface of the fixed disk (51). The output shaft of the driving motor (54) is coaxially fixedly connected to the rotating disk (55). A plurality of extrusion columns (511) are fixed around the central axis of the rotating disk (55). A cleaning belt (512) is wound around each of the extrusion columns (511). Both ends of the cleaning belt (512) are connected to the retracting device. The retracting device is used to drive the cleaning belt (512) to move on the surface of the extrusion column (511).

2. The quantitative dispensing device for PCB circuit board according to claim 1, characterized in that: The retracting and releasing device comprises a fixed ring (53), a plurality of support rods (52), a plurality of first vertical shafts (56), a plurality of first pulleys (57), a plurality of second vertical shafts (59), a plurality of second pulleys (510), and a plurality of connecting plates (58); a fixed ring (53) is coaxially arranged above the rotating disk (55), and the extrusion columns (511) are all placed in the fixed ring (53); the fixed ring (53) is fixedly connected to the fixed disk (51) through the plurality of support rods (52); a first vertical shaft (56) is arranged between each of the extrusion columns (511) and the fixed ring (53); the first vertical shaft (56) is arranged parallel to the central axis of the fixed ring (53); the bottom end of the first vertical shaft (56) is fixedly connected to the rotating disk (55); the upper end of the first vertical shaft (56) is fixedly connected to the rotating disk (55); A first pulley (57) is coaxially rotated, and a plurality of second pulleys (510) are circumferentially arranged on the outer edge of the fixed ring (53). The second pulleys (510) are arranged one-to-one with the first pulleys (57). A second vertical shaft (59) is coaxially rotated on each of the second pulleys (510). The second vertical shaft (59) is fixedly connected to the top of the first vertical shaft (56) via a connecting plate (58). Two ends of the cleaning belt (512) on each of the extrusion columns (511) are respectively fixedly wound on the first pulley (57) and the second pulley (510). An inner toothed ring (522) is coaxially fixed in the fixed ring (53), and a gear (513) is coaxially fixed on each of the first pulleys (57). The gears (513) are meshed with the inner toothed ring (522).

3. The quantitative dispensing device for PCB circuit board according to claim 2, characterized in that: An inner cavity (518) is provided in the extrusion column (511), an arc-shaped opening (519) is provided on the extrusion column (511) on one side facing the central axis of the fixing ring (53), the arc-shaped opening (519) is communicated with the inner cavity (518), the arc-shaped opening (519) is covered and fixed with an arc-shaped skin (520), and the arc-shaped skin (520) is penetrated by a plurality of air holes (521); A friction block (514) is correspondingly arranged between each of the first vertical shafts (56) and the fixed ring (53); the friction block (514) is in contact with the inner wall of the fixed ring (53); a liquid storage cavity (516) is provided in the friction block (514); the liquid storage cavity (516) stores cleaning liquid; the liquid storage cavity (516) is connected to the inner cavity (518) via a pipeline; and the friction block (514) is connected to the first vertical shaft (56).

4. The quantitative dispensing device for PCB circuit board according to claim 3, characterized in that: A first tube body (515) is fixedly passed through the first vertical axis (56); the inner end of the first tube body (515) is communicated with the inner cavity (518); a second tube body (517) is coaxially inserted at the outer end of the first tube body (515); the second tube body (517) is communicated with the liquid storage cavity (516); a compression spring is sleeved on the second tube body (517) between the outer end of the first tube body (515) and the friction block (514); the two ends of the compression spring are respectively fixedly connected to the friction block (514) and the first vertical axis (56).

5. The quantitative dispensing device for PCB circuit board according to claim 3, characterized in that: The arc-shaped skin (520) is made of a highly elastic rubber material.

6. The quantitative dispensing device for PCB circuit board according to claim 3, characterized in that: The friction block (514) is in an arc shape as a whole, and is made of metal.

7. The quantitative dispensing device for PCB circuit board according to claim 1, characterized in that: The cleaning belt (512) is made of breathable non-woven fabric.

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