Automatic dispensing device for LCD display screen

Abstract

The application discloses an automatic dispensing device for LCD display screen, which comprises a dispensing cylinder and a dispensing nozzle installed at the bottom of the dispensing cylinder, the dispensing cylinder is installed in a U-shaped supporting frame, the upper end of the supporting frame is installed on a mounting horizontal plate, a reciprocating air cylinder is installed above the mounting horizontal plate, the piston rod of the reciprocating air cylinder is connected with the top of the dispensing cylinder, the inner cavity of the dispensing cylinder is sequentially provided with an air inlet cavity, a glue pressing cavity, a preheating cavity and a dispensing cavity from top to bottom, a partition shoulder is arranged between the glue pressing cavity and the preheating cavity, a clamping seat is arranged between the preheating cavity and the dispensing cavity, an air joint is arranged on the side wall of the air inlet cavity, and a glue supplement joint is arranged on the side wall of the preheating cavity; a glue back-sucking mechanism is arranged outside the dispensing nozzle; the glue back-sucking mechanism is arranged, the glue in the dispensing nozzle is back-sucked after dispensing, the phenomenon of glue hanging and pulling on the dispensing nozzle can be effectively reduced, and the dispensing quality of the LCD display screen is improved.

Description

Technical Field

[0001] This invention relates to the field of LCD display manufacturing technology, and in particular to an automatic dispensing device for LCD displays. Background Technology

[0002] LCD stands for Liquid Crystal Display. The structure of an LCD is to place a liquid crystal cell between two parallel glass substrates [1]. A TFT (thin-film transistor) is set on the lower substrate glass, and a color filter is set on the upper substrate glass. The rotation direction of the liquid crystal molecules is controlled by changing the signal and voltage on the TFT, thereby controlling whether polarized light is emitted from each pixel to achieve the display purpose. LCD screens are used in digital clocks and mobile display models of many portable computers. In the production and processing of LCD screens, a dispensing process is required to ensure production quality. Existing automatic dispensing devices are prone to glue sticking and pulling on the dispensing nozzle during dispensing, which affects the production quality of LCD screens. In view of the above problems, this invention provides a solution. Summary of the Invention

[0003] The purpose of this invention is to provide an automatic dispensing device for LCD displays.

[0004] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0005] An automatic dispensing device for an LCD display includes a dispensing cylinder and a dispensing nozzle mounted at the bottom of the dispensing cylinder. The dispensing cylinder is installed inside a U-shaped support frame, the upper end of which is mounted on a mounting plate. A reciprocating cylinder is mounted above the mounting plate, and the piston rod of the reciprocating cylinder is connected to the top of the dispensing cylinder. The inner cavity of the dispensing cylinder, from top to bottom, has an air inlet chamber, a pressure chamber, a preheating chamber, and a dispensing chamber. A pressure piston is installed in the pressure chamber. A partition shoulder is provided between the pressure chamber and the preheating chamber. A clamping seat is provided between the preheating chamber and the dispensing chamber. An air connector is provided on the side wall of the air inlet chamber, and a glue replenishment connector is provided on the side wall of the preheating chamber. The dispensing nozzle consists of a sealing block at the upper end and... The lower end consists of a spray nozzle. A return spring in a compressed state is provided between the sealing block and the top clamping seat. The bottom of the dispensing cavity is conical. The bottom of the sealing block is a frustum shape adapted to the dispensing cavity, and a sealing ring is provided on the conical surface. The upper end of the spray nozzle is connected to the sealing block. The lower end of the spray nozzle extends out of the dispensing tube from the dispensing hole. The upper end of the spray nozzle is provided with a glue inlet hole. The inner wall of the dispensing hole is provided with a sealing groove for installing a second sealing ring. The second sealing ring fits and seals against the outer wall of the spray nozzle. A stop block is provided on the outer wall of the spray nozzle extending out of the dispensing tube. The stop block is provided with a through hole for the lower end of the spray nozzle to pass through, and the size of the through hole is smaller than the size of the stop block. A back suction mechanism for back suction of glue is provided on the outer side of the dispensing nozzle.

[0006] Furthermore, the back suction mechanism includes a back suction block, a connecting rod, a guide connecting rod, a back suction chamber, and a back suction piston. The back suction block is disposed on the side wall of the nozzle, the back suction chamber is disposed inside the back suction block, the back suction piston is installed inside the back suction chamber, the bottom of the back suction chamber is connected to the central hole of the nozzle, the upper end of the back suction piston is connected to the guide connecting rod, the guide connecting rod passes through the guide hole on the abutment and is connected to the connecting rod, and one end of the connecting rod is fixedly connected to the bottom side wall of the dispensing cylinder.

[0007] Furthermore, there are multiple glue inlet holes, which are evenly distributed on the circumference of the nozzle below the sealing block.

[0008] Furthermore, the glue-filling joint is installed at the top of the preheating chamber, below the partition shoulder.

[0009] Furthermore, the preheating chamber has an electric heating wire one on its side wall; the dispensing chamber has a tapered bottom, and the tapered side wall at the bottom of the dispensing chamber has an electric heating wire two.

[0010] Furthermore, an electric heating wire is provided on the outside of the suction block and the suction cavity.

[0011] Furthermore, a positioning protrusion for inserting a reset spring is provided below the clamping seat, and the side wall of the clamping seat is connected to the inner wall of the dispensing cylinder via a connecting rod.

[0012] In summary, the present invention has the following beneficial effects: by setting a back suction mechanism, the present invention can effectively reduce the phenomenon of glue hanging and pulling on the glue nozzle after dispensing, thereby improving the quality of dispensing on LCD displays. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention;

[0014] Figure 2 This is a schematic diagram of the structure of the dispensing cylinder of the present invention;

[0015] Figure 3 This is a partial schematic diagram of the dispensing cartridge;

[0016] Figure 4 yes Figure 3 A magnified view of part A in the middle;

[0017] Figure 5 This is a schematic diagram of the top clamping seat of the present invention.

[0018] In the diagram, 1. Dispensing cylinder; 2. Support frame; 3. Mounting plate; 4. Reciprocating cylinder; 5. Dispensing nozzle; 6. Back suction block; 7. Pressing chamber; 8. Preheating chamber; 9. Dispensing chamber; 10. Pressing piston; 11. Air connector; 12. Refill connector; 13. Tightening seat; 14. Electric heating wire one; 15. Electric heating wire two; 16. Dispensing hole; 17. Sealing groove; 18. Connecting rod; 19. Piston rod; 20. Return spring; 21. Sealing block; 22. Sealing ring one; 23. Glue inlet hole; 24. Support block; 25. Sealing ring two; 26. Guide connecting rod; 27. Back suction chamber; 28. Back suction piston; 29. ​​Electric heating wire three; 30. Positioning protrusion; 31. Connecting rod. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings. The technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figure 1-5As shown, an automatic dispensing device for an LCD display includes a dispensing cylinder 1 and a dispensing nozzle 5 installed at the bottom of the dispensing cylinder 1. The dispensing cylinder 1 is installed inside a U-shaped support frame 2. The upper end of the support frame 2 is installed on a mounting plate 3. A reciprocating cylinder 4 is installed above the mounting plate 3. The piston rod 19 of the reciprocating cylinder 4 is connected to the top of the dispensing cylinder 1. The reciprocating cylinder 4 drives the dispensing cylinder 1 to move relative to the support frame 2. The inner cavity of the dispensing cylinder 1 is provided with an air inlet chamber, a pressing chamber 7, a preheating chamber 8, and a dispensing chamber 9 from top to bottom. A pressing piston 10 is installed in the pressing chamber 7. A partition shoulder is provided between the pressing chamber 7 and the preheating chamber 8. A clamping seat 13 is provided between the preheating chamber 8 and the dispensing chamber 9. An air connector 11 is provided on the side wall of the air inlet chamber. Air pressure is introduced through the air connector 11 to stabilize the pressure at the upper end of the pressing piston 10. The air pressure can be introduced by connecting to an air pump. A pressure regulating valve is installed on the air line. The preheating chamber 8 has a glue-filling connector 12 on its side wall for adding glue. The glue-filling nozzle 5 consists of an upper sealing block 21 and a lower spray nozzle. A compressed return spring 20 is provided between the sealing block 21 and the top clamping seat 13. The bottom of the glue-filling chamber 9 is conical, and the bottom of the sealing block 21 is a frustum shape adapted to the glue-filling chamber 9, with a sealing ring 22 on the conical surface. The upper end of the spray nozzle is connected to the sealing block 21, and the lower end of the spray nozzle... The nozzle 5 extends from the dispensing hole 16 into the dispensing tube 1. The upper end of the nozzle is provided with a glue inlet through hole 23. The inner wall of the dispensing hole 16 is provided with a sealing groove 17 for installing a second sealing ring 25. The second sealing ring 25 fits and seals against the outer wall of the nozzle. The outer wall of the nozzle extending out of the dispensing tube 1 is provided with a stop block 24. The stop block 2 is provided with a through hole for the lower end of the nozzle to pass through, and the size of the through hole is smaller than the size of the stop block 24. The outer side of the dispensing nozzle 5 is provided with a back suction mechanism for back suction of glue.

[0021] Furthermore, such as Figure 3 and Figure 4 As shown, the back suction mechanism includes a back suction block 6, a connecting rod 18, a guide connecting rod 26, a back suction chamber 27, and a back suction piston 28. The back suction block 6 is disposed on the side wall of the nozzle, the back suction chamber 27 is disposed inside the back suction block 6, and the back suction piston 28 is installed inside the back suction chamber 27. The bottom of the back suction chamber 27 is connected to the central hole of the nozzle, and the upper end of the back suction piston 28 is connected to the guide connecting rod 26. The guide connecting rod 26 passes through the guide hole on the abutment 2 and is connected to the connecting rod 18. One end of the connecting rod 18 is fixedly connected to the bottom side wall of the dispensing cylinder 1. Through the back suction mechanism, the glue in the nozzle can be back suctioned, avoiding glue residue on the dispensing nozzle 5.

[0022] Furthermore, there are multiple glue inlet holes 23, which are evenly distributed on the circumference of the nozzle below the sealing block 21. The glue enters the nozzle through the glue inlet holes 23 under the push of the glue pressing piston 10.

[0023] Furthermore, the glue-filling joint 12 is installed on top of the preheating chamber 8, below the partition shoulder.

[0024] Furthermore, the preheating chamber 8 is provided with an electric heating wire 14 on its side wall; the bottom of the dispensing chamber 9 is tapered, and the tapered side wall of the bottom of the dispensing chamber 9 is provided with an electric heating wire 15. Similarly, the side wall of the pressing chamber 7 can also be provided with an electric heating wire.

[0025] Furthermore, an electric heating wire 27 is provided on the outside of the suction cavity 27 on the suction block 6. The glue in the suction cavity 27 can be used for the next dispensing. The electric heating wire 27 is used to heat the glue in the suction cavity 27.

[0026] Furthermore, such as Figure 5 As shown, a positioning protrusion 30 is provided below the top clamping seat 13, into which the reset spring 20 extends. The side wall of the top clamping seat 13 is connected to the inner wall of the dispensing cylinder 1 via a connecting rod 31.

[0027] Working principle: First, the glue dispensing cylinder 1 is filled with glue through the glue filling connector 12. Then, the valve on the glue filling pipeline connected to the glue filling connector 12 is closed to isolate it from the glue source. Air is injected through the air connector 11 to stabilize the pressure at the upper end of the glue dispensing piston 10. When dispensing, the reciprocating cylinder 4 moves the glue dispensing cylinder 1 downward. When the abutment block 24 contacts the abutment frame 2, it pushes the sealing block 21 of the glue dispensing nozzle 5 upward to compress the return spring. The sealing block 21 separates from the bottom sealing surface of the glue dispensing cylinder 1, and the glue is dispensed onto the glue dispensing piston 10. Under the action of the force, the glue is pressed into the nozzle for dispensing. At the same time, the suction piston 28 also moves downward to replenish the glue in the suction chamber 27 into the nozzle for dispensing. After dispensing is completed, the reciprocating cylinder 4 drives the dispensing cylinder 1 to move upward, and the suction piston 28 moves upward accordingly to suck the glue in the nozzle into the suction chamber 27, avoiding glue hanging and pulling phenomena. When the stop block 24 separates from the base frame 2, the sealing block 21 moves downward relative to the dispensing cylinder 1 under the action of the return spring 20, and fits and seals with the bottom sealing surface of the dispensing cylinder 1, stopping the glue dispensing.

[0028] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. An automatic dispensing device for an LCD display screen, comprising a dispensing cylinder (1) and a dispensing nozzle (5) installed at the bottom of the dispensing cylinder (1), characterized in that: The dispensing cylinder (1) is installed inside a U-shaped support frame (2). The upper end of the support frame (2) is installed on a mounting plate (3). A reciprocating cylinder (4) is installed above the mounting plate (3). The piston rod (19) of the reciprocating cylinder (4) is connected to the top of the dispensing cylinder (1). The inner cavity of the dispensing cylinder (1) is provided with an air inlet chamber, a pressing chamber (7), a preheating chamber (8), and a dispensing chamber (9) from top to bottom. A pressing piston (10) is installed in the pressing chamber (7). A separating shoulder is provided between the pressing chamber (7) and the preheating chamber (8). A clamping seat (13) is provided between the dispensing chambers (9), an air connector (11) is provided on the side wall of the air inlet chamber, and a glue filling connector (12) is provided on the side wall of the preheating chamber (8); the dispensing nozzle (5) consists of a sealing block (21) at the upper end and a spray pipe at the lower end, a return spring (20) in a compressed state is provided between the sealing block (21) and the clamping seat (13), the bottom of the dispensing chamber (9) is conical, the bottom of the sealing block (21) is a frustum shape adapted to the dispensing chamber (9), and a sealing ring (22) is provided on the conical surface, and the upper end of the spray pipe is connected to the sealing block (21). The lower end of the nozzle extends from the dispensing hole (16) into the dispensing tube (1). The upper end of the nozzle is provided with a glue inlet through hole (23). The inner wall of the dispensing hole (16) is provided with a sealing groove (17) for installing a sealing ring two (25). The sealing ring two (25) is fitted and sealed to the outer wall of the nozzle. The outer wall of the nozzle extending out of the dispensing tube (1) is provided with a stop block (24). The stop block (2) is provided with a through hole for the lower end of the nozzle to pass through, and the size of the through hole is smaller than the size of the stop block (24). The outer side of the dispensing nozzle (5) is provided with a back suction mechanism for back suction of glue. The back suction mechanism includes a back suction block (6). The nozzle consists of a connecting rod (18), a guide connecting rod (26), a back suction chamber (27), and a back suction piston (28). The back suction block (6) is located on the side wall of the nozzle. The back suction chamber (27) is located inside the back suction block (6). The back suction piston (28) is installed inside the back suction chamber (27). The bottom of the back suction chamber (27) is connected to the middle hole of the nozzle. The upper end of the back suction piston (28) is connected to the guide connecting rod (26). The guide connecting rod (26) passes through the guide hole on the abutment (2) and is connected to the connecting rod (18). One end of the connecting rod (18) is fixedly connected to the bottom side wall of the dispensing cylinder (1).

2. The automatic dispensing device for an LCD display screen according to claim 1, characterized in that: The number of glue inlet holes (23) is multiple, and the multiple glue inlet holes (23) are evenly distributed on the circumference of the nozzle below the sealing block (21).

3. The automatic dispensing device for an LCD display screen according to claim 2, characterized in that: The glue-filling joint (12) is installed on top of the preheating chamber (8) and below the partition shoulder.

4. The automatic dispensing device for an LCD display screen according to claim 3, characterized in that: The preheating chamber (8) is provided with an electric heating wire (14) on its side wall; the bottom of the dispensing chamber (9) is tapered, and the bottom tapered side wall of the dispensing chamber (9) is provided with an electric heating wire (15).

5. An automatic dispensing device for an LCD display screen according to claim 4, characterized in that: The back suction block (6) is provided with an electric heating wire three (29) on the outside of the back suction cavity (27).

6. An automatic dispensing device for an LCD display screen according to claim 5, characterized in that: The top clamping seat (13) is provided with a positioning protrusion (30) that extends into the reset spring (20) below it, and the side wall of the top clamping seat (13) is connected to the inner wall of the dispensing cylinder (1) through a connecting rod (31).

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