Pneumatic gluing device

Abstract

The utility model provides a pneumatic gluing device, and belongs to the technical field of laser head machining. Comprising a closed storage box and a gluing gun, the gluing gun comprises a shell and a plunger rod longitudinally connected into the shell in a sliding mode, a first piston, a second piston and a sealing head which are matched with the inner wall of the shell are sequentially arranged on the plunger rod from top to bottom, and the outer diameter of the first piston is larger than that of the second piston; a pressure stabilizing piston is connected to the portion, between the first piston and the second piston, of the plunger rod in a sliding mode, and a first pre-tightening spring is arranged between the pressure stabilizing piston and the first piston. The glue discharging device has the advantages of stable glue discharging speed and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to laser head processing technical field relates to a pneumatic gluing device. BACKGROUND

[0002] The light drive laser head is involved in gluing process in many parts assembly and packaging process, and the used glue is mostly medium-high viscosity glue, generally adopts pneumatic or electric mode, drives screw or plunger to run and realizes one-way supply of glue solution, wherein, the pneumatic mode is relatively simple in structure, and the response is relatively fast, but, there is the problem of inconstant air pressure in intermittent operation process, causes the highlighting of gluing uniformity at start and stop, causes the adverse effect to gluing quality. SUMMARY

[0003] The utility model discloses to solve the technical problem of how to improve the stability of glue extrusion.

[0004] The utility model discloses a pneumatic gluing device, which is characterized by comprising a closed storage tank and a gluing gun.

[0005] Further, the lower end surface of the first piston and the plunger rod are smoothly connected.

[0006] In the scheme, the plunger rod, the first piston and the second piston are integrated structure, under the action of the positive pressure source, the pressure stabilizing piston can compress the pre-tightening spring I and go up, until the exhaust cavity and the air inlet cavity are communicated, at this time, the airflow enters the exhaust cavity and above the liquid level of the storage tank, under the action of the air pressure, the glue enters the glue inlet cavity from the bottom of the storage tank, under the action of the glue pressure and the air pressure, the plunger rod goes up as a whole, drives the sealing head to open the glue outlet of the shell, and then makes the glue liquid be discharged, it is not difficult to see that when the pressure in the air inlet cavity is small, due to the blocking effect of the pressure stabilizing piston, the glue liquid will not flow, only when the air pressure reaches a certain degree, the glue liquid will be squeezed out, therefore, when the glue is frequently started or dispensed, the squeezing speed of the glue liquid is small, and the glue dispensing effect is good. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 It is a structural schematic view of the glue dispensing device.

[0008] Figure 2 It is a structural schematic view of the glue gun in the stop state.

[0009] Figure 3 It is a structural schematic view of the glue gun when the pressure in the air inlet cavity is small.

[0010] Figure 4 It is a structural schematic view of the glue gun in the glue dispensing state.

[0011] In the figure, 1, the storage tank; 2, the glue gun; 21, the shell; 22, the plunger rod; 23, the first piston; 24, the second piston; 25, the sealing head; 26, the pressure stabilizing piston; 27, the pre-tightening spring I; 28, the pre-tightening spring II; 31, the exhaust cavity; 32, the air inlet cavity; 33, the glue inlet cavity. DETAILED DESCRIPTION

[0012] The following is a specific embodiment of the utility model and is combined with the drawings, the technical scheme of the utility model is further described, but the utility model is not limited to these embodiments.

[0013] For example, Figure 1 And Figure 2The shown pneumatic glue gun device comprises a closed tank 1 and a glue gun 2, the glue gun 2 comprises a shell 21 and a plunger rod 22 longitudinally slidingly connected in the shell 21, the plunger rod 22 is sequentially provided with a first piston 23, a second piston 24 and a sealing head 25 from top to bottom, the first piston 23 has an outer diameter larger than that of the second piston 24, a pressure stabilizing piston 26 is slidingly connected on the plunger rod 22 between the first piston 23 and the second piston 24, a pre-tightening spring 27 is arranged between the pressure stabilizing piston 26 and the first piston 23, a pre-tightening spring 28 is arranged between the plunger rod 22 and the top of the shell 21, a closed exhaust cavity 31 can be formed between the first piston 23 and the pressure stabilizing piston 26, a closed air inlet cavity 32 can be formed between the second piston 24 and the pressure stabilizing piston 26, a glue inlet cavity 33 can be formed between the second piston 24 and the glue outlet of the shell 21 when the sealing head 25 blocks the glue outlet, the air inlet cavity 32 is connected with a positive pressure gas source, the exhaust cavity 31 is communicated with the inner cavity of the tank 1 above the glue liquid level, the glue inlet cavity 33 is communicated with the inner cavity of the tank 1 below the glue liquid level, and the lower end surface of the first piston 23 is smoothly connected with the plunger rod 22.

[0014] In the scheme, the plunger rod 22, the first piston 23 and the second piston 24 are integrated, when stopping, i.e. when the positive pressure gas source is disconnected, as shown, Figure 2 As shown, the pressure stabilizing piston 26 is sealed with the inner wall of the shell 21, and the air inlet cavity 32 and the exhaust cavity 31 are cut off, when the air inlet pressure in the start-stop gap is small, as shown, Figure 3 As shown, the pressure stabilizing piston 26 goes up to the air inlet cavity 32 and the exhaust cavity 31, at this time, the airflow enters the exhaust cavity 31 and the inner cavity of the tank 1 above the glue liquid level, under the action of the air pressure, the glue liquid enters the glue inlet cavity 33 from the bottom of the tank 1, as shown, Figure 4 As shown, the positive pressure gas source continues to act, under the action of the glue liquid pressure and the air pressure, the plunger rod 22 goes up as a whole, drives the sealing head 25 to open the glue outlet of the shell 21, and further enables the glue liquid to be discharged, it is not difficult to see that when the pressure in the air inlet cavity 32 is small, due to the blocking effect of the pressure stabilizing piston 26, the glue liquid will not flow, only when the air pressure reaches a certain degree, the glue liquid will be squeezed out, therefore, when frequently starting or dispensing, the squeezing speed of the glue liquid fluctuates small, and the glue dispensing effect is good.

[0015] The specific embodiments described in the present text are merely illustrative of the spirit of the present application. Those skilled in the art to which the present application belongs can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A pneumatic glue applicator, characterized in that, The device includes a sealed storage tank (1) and a glue gun (2). The glue gun (2) includes a housing (21) and a plunger rod (22) slidably connected longitudinally within the housing (21). The plunger rod (22) is provided with, from top to bottom, a first piston (23), a second piston (24), and a sealing head (25) adapted to the inner wall of the housing (21). The outer diameter of the first piston (23) is larger than the outer diameter of the second piston (24). A pressure-stabilizing piston (26) is slidably connected to the plunger rod (22) between the first piston (23) and the second piston (24). A preload spring (27) is provided between the pressure-stabilizing piston (26) and the first piston (23). A preload spring (28) is provided between the plunger rod (22) and the top of the housing (21). A sealed exhaust chamber (31) can be formed between the first piston (23) and the pressure stabilizing piston (26). A sealed air inlet chamber (32) can be formed between the second piston (24) and the pressure stabilizing piston (26). An air inlet chamber (33) can be formed between the second piston (24) and the glue outlet of the housing (21) when the sealing head (25) blocks the glue outlet. The air inlet chamber (32) is connected to a positive pressure air source. The exhaust chamber (31) is connected to the inner cavity of the storage tank (1) above the glue liquid surface. The air inlet chamber (33) is connected to the inner cavity of the storage tank (1) below the glue liquid surface.

2. The pneumatic glue applicator according to claim 1, characterized in that, The lower end face of the first piston (23) transitions smoothly with the plunger rod (22).

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