CN215703519U

CN215703519U - Low-pressure glue injection gun using LD-PE material

Info

Publication number: CN215703519U
Application number: CN202121197090.XU
Authority: CN
Inventors: 张宏卓
Original assignee: Guangdong Mingji High Tech Electronics Co ltd
Current assignee: Guangdong Mingji High Tech Electronics Co ltd
Priority date: 2021-05-31
Filing date: 2021-05-31
Publication date: 2022-02-01
Anticipated expiration: 2031-05-31

Abstract

The utility model relates to an injecting glue rifle technical field, concretely relates to use low pressure injecting glue rifle of LD-PE material, including pneumatic valve, rifle head, solenoid valve and glue solution heater, the pneumatic valve includes valve body, front end housing and rear end cap, the front end housing is seted up there is the valve mouth of glue play, still includes the needle, the valve body is seted up the valve that supplies the glue solution to get into and is advanced gluey mouth, the valve advance gluey mouth with the play liquid end of glue solution heater is connected, this internal cylinder body that is provided with of valve is provided with piston assembly in the cylinder body, the rear end and the piston assembly fixed connection of needle, the valve body is seted up there is the valve air inlet, the valve air inlet communicates with the foremost end of cylinder body, the valve air inlet with the end intercommunication of giving vent to anger of solenoid valve still including pressing from both sides the high rebound spare of locating between the rear end face of piston assembly and cylinder body. The glue injection gun controls the injection molding work of LD-PE glue solution through the cooperation of the electromagnetic valve and the pneumatic valve, can accurately control the single glue injection amount of the LD-PE glue solution, and has high control precision and good stability.

Description

Low-pressure glue injection gun using LD-PE material

Technical Field

The application relates to the technical field of glue injection guns, in particular to a low-pressure glue injection gun using LD-PE materials.

Background

The junction of the wiring harness and the PCB of the prior electronic product needs to be subjected to injection molding and curing through an injection molding process to form an encapsulation internal mold, so that the purpose of protecting welding spots and connecting lines is achieved. The internal mold packaging device is particularly suitable for internal mold packaging processing of the joint of a PCB (printed circuit board) and a wiring harness of a USB connecting male head or female head. The raw materials of the existing injection molding process mainly comprise an LE-PE material and a hot melt adhesive, the LE-PE material is low in price (12.3 yuan/kg), high in hardness and good in product protection performance, the LE-PE material is widely applied, the proportion of the LE-PE material adopted in the wire harness injection molding process is about 95%, and the rest hot melt adhesive with higher price is adopted. Although the LE-PE material is high in quality and low in price, due to the fact that the LE-PE material is high in viscosity and hardness, the injection molding pressure required in the existing injection molding process is extremely high, and the glue solution is easy to damage welding points or break wire harnesses. Although the hot melt adhesive can be injected with low-pressure glue, the hot melt adhesive is softer after being cured and molded, the hardness of the hot melt adhesive is low, the protection strength on the wire harness and the welding spot at the joint is low, and the cost is extremely high. Therefore, how to realize low-pressure high-precision injection molding of the LE-PE material is a problem to be solved in the wire harness injection molding processing industry at present.

Disclosure of Invention

In order to overcome the defects and shortcomings in the prior art, the application aims to provide the low-pressure glue injection gun using the LD-PE material, the glue injection gun controls the injection molding work of the LD-PE glue solution through the cooperation of the electromagnetic valve and the pneumatic valve, the single glue injection amount of the LD-PE glue solution can be accurately controlled, the control precision is high, and the stability is good.

The purpose of the application is realized by the following technical scheme: a low-pressure glue injection gun using LD-PE materials comprises a pneumatic valve, a gun head fixed at a glue outlet end of the pneumatic valve, a solenoid valve used for controlling the opening and closing of the pneumatic valve, and a glue solution heater used for heat preservation of glue solution, wherein the pneumatic valve comprises a valve body, a front end cover fixed at the front end of the valve body, and a rear end cover fixed at the rear end of the valve body, the front end cover is provided with a glue outlet with a valve, the low-pressure glue injection gun also comprises a valve needle arranged in the valve body and used for controlling the opening and closing of the glue outlet with the valve, the valve body is provided with a glue inlet for the glue solution to enter, the glue inlet with the liquid outlet end of the glue solution heater, a cylinder body is arranged in the valve body, a piston assembly is arranged in the cylinder body, the rear end of the valve needle is fixedly connected with the piston assembly, the valve body is provided with a valve air inlet, the valve air inlet is communicated with the foremost end of the cylinder body, and the valve air outlet end of the solenoid valve is communicated with the air outlet end of the solenoid valve, the piston assembly is characterized by further comprising a high-resilience piece clamped between the piston assembly and the rear end face of the cylinder body.

The liquid glue heating device comprises a liquid glue heater, a liquid glue heater and a gear pump, wherein the liquid glue heater further comprises a gear pump for conveying liquid glue, the liquid inlet end of the liquid glue heater is connected with a Glan head, and the Glan head is connected with the liquid outlet end of the gear pump.

Wherein, piston assembly includes tensioning plate, last tensioning plate and flexible glue seal down, the flexible glue seal is formed by opening orientation opposite rubberizing cap and lower rubberizing cap integrated into one piece, it locates in the rubberizing cap to go up the tensioning plate cover, just it locates to go up the tensioning plate cover outside the needle, in the lower rubber cap is located to the tensioning plate cover, still include the T type lantern ring, T type lantern ring cover is located outside the needle, tensioning plate cover is located down outside the T type lantern ring.

Wherein the valve needle is provided with a stroke limiting block for limiting the maximum stroke of the forward action of the valve needle.

The valve needle is characterized by further comprising a stroke limiting bolt used for limiting the maximum stroke of the valve needle in the backward motion, the end of the stroke limiting bolt penetrates through the rear end cover and then extends into the rear section of the cylinder body, the end of the stroke limiting bolt is located right behind the rear end of the valve needle, and the stroke limiting bolt is in threaded connection with the rear end cover.

Wherein, the high resilience piece is a high resilience pressure spring or a high resilience soft rubber piece.

The high-resilience soft rubber piece is formed by integrally forming a soft rubber sleeve body and two anti-cracking rings, and the two anti-cracking rings are respectively covered on two end faces of the soft rubber sleeve body.

Wherein, the anti-cracking ring is a circle of thread type soft rubber ring.

The air outlet end of the electromagnetic valve is connected with an air outlet pipe, and the air outlet pipe is communicated with the air inlet of the valve through the glue solution heater.

The beneficial effect of this application lies in: the utility model provides an injecting glue rifle passes through the opening and shutting of the air current of the valve air inlet of solenoid valve control entering pneumatic valve, the pressure drive piston assembly of rethread air current itself removes towards the rear end of cylinder body, thereby drive the needle backward and move, and then make the needle open the valve and go out the jiao kou, the LD-PE glue solution of glue solution heater advances in the jiao kou admission valve through the valve and goes out jiao kou outflow through the valve and get into the rifle head in and carry out the injecting glue work, when needing to stop the injecting glue, the solenoid valve stops to valve air inlet air feed and exhausts, piston assembly rebounds under the effect of high resilience piece fast and resets to the initial position, closed valve goes out jiao kou. The electromagnetic valve and the pneumatic valve are matched to control injection molding work of the LD-PE glue solution, single glue injection amount of the LD-PE glue solution can be accurately controlled, control precision is high, stability is good, the LD-PE glue solution which is about to enter the pneumatic valve for glue injection work is heated and insulated through the glue solution heater, the glue solution can be ensured to be in the best glue injection temperature and flow state, resistance of the LD-PE glue solution flowing through each component is reduced, glue injection is smoother, pressure required by LD-PE glue solution injection is effectively reduced, and low-pressure glue injection is achieved.

Drawings

FIG. 1 is a schematic structural diagram of the present application;

FIG. 2 is a cross-sectional view of the pneumatic valve and tip of the present application;

FIG. 3 is a perspective view of the present application;

FIG. 4 is a perspective view of the soft gel seal of the present application;

FIG. 5 is a perspective view of the high resilience bladder member of the present application;

FIG. 6 is a cross-sectional view of the injection molding mold of the present application;

fig. 7 is an enlarged view of the area a in fig. 6 of the present application.

The reference signs are: the pneumatic valve 201, the valve body 202, the front end cover 203, the rear end cover 204, the gun head 205, the valve glue outlet 206, the valve needle 207, the valve glue inlet 208, the cylinder 209, the valve air inlet 210, the high resilience piece 211, the glan head 212, the lower tensioning piece 213, the upper tensioning piece 214, the soft glue sealing body 215, the upper gluing cap 216, the lower gluing cap 217, the T-shaped collar 218, the stroke limiting block 219, the stroke limiting bolt 220, the high resilience soft glue piece 221, the soft glue sleeve body 222, the anti-cracking ring 223, the air outlet pipe 224, the solenoid valve 225, the glue heater 226, the upper die 227, the lower die 228, the upper die cavity 229, the lower die cavity 230, the water gap 231 and the plug hole 232.

Detailed Description

For the convenience of understanding of those skilled in the art, the present application will be further described with reference to the following examples and accompanying fig. 1 to 7, and the content of the embodiments is not limited to the present application.

A low-pressure glue injection gun using LD-PE materials comprises a pneumatic valve 201, a gun head 205 fixed at the glue outlet end of the pneumatic valve 201, an electromagnetic valve 225 used for controlling the opening and closing of the pneumatic valve 201, and a glue solution heater 226 used for heat preservation of glue solution, wherein the pneumatic valve 201 comprises a valve body 202, a front end cover 203 fixed at the front end of the valve body 202, and a rear end cover 204 fixed at the rear end of the valve body 202, the front end cover 203 is provided with a glue outlet 206 with a valve, the low-pressure glue injection gun further comprises a valve needle 207 arranged in the valve body 202 and used for controlling the opening and closing of the glue outlet 206 with the valve, the valve body 202 is provided with a glue inlet 208 for glue solution to enter, the glue inlet 208 is connected with the liquid outlet end of the glue solution heater 226, a cylinder 209 is arranged in the valve body 202, a piston assembly is arranged in the cylinder 209, the rear end of the valve needle 207 is fixedly connected with the piston assembly, the valve body 202 is provided with a gas inlet 210 with a valve, the valve inlet 210 is communicated with the foremost end of the cylinder 209, the valve inlet 210 is communicated with the air outlet end of the electromagnetic valve 225, and the high-resilience member 211 is clamped between the piston assembly and the rear end face of the cylinder 209.

The glue solution heating device further comprises a gear pump for conveying glue solution, the liquid inlet end of the glue solution heater 226 is connected with a gland head 212, and the gland head 212 is connected with the liquid outlet end of the gear pump.

The piston assembly comprises a lower tensioning sheet 213, an upper tensioning sheet 214 and a soft rubber sealing body 215, the soft rubber sealing body 215 is formed by an upper rubber cap 216 and a lower rubber cap 217 which are opposite in opening direction in an integrated forming mode, the upper tensioning sheet 214 is sleeved in the upper rubber cap 216, the upper tensioning sheet 214 is sleeved outside the valve needle 207, the lower tensioning sheet 213 is sleeved in the lower rubber cap 217, the piston assembly further comprises a T-shaped sleeve ring 218, the T-shaped sleeve ring 218 is sleeved outside the valve needle 207, and the lower tensioning sheet 213 is sleeved outside the T-shaped sleeve ring 218. In the practical application process, under the action of the high rebound member 211, the upper tension sheet 214 is subjected to forward extrusion force of the high rebound member 211, the piston assembly is kept at the foremost end of the cylinder 209, the pneumatic valve 201 is in a closed state, when glue injection is required, the solenoid valve 225 works and sends constant-pressure air flow into the foremost end of the cylinder 209 through the valve air inlet 210, the constant-pressure air flow backwards extrudes the lower tension sheet 213 to drive the valve needle 207 to move backwards, the valve glue outlet 206 is opened, glue injection starts, when glue injection is required to stop, the solenoid valve 225 stops sending the constant-pressure air flow to the valve air inlet 210 and exhausts the piston assembly resets to close the valve glue outlet 206 under the action of the high rebound member 211. The piston assembly of this application adopts the structural design of tensioning piece 213 and last tensioning piece 214 under the cooperation of flexible glue seal 215, and flexible glue seal 215 is by structure cooperation tensioning piece 213 and last tensioning piece 214 down that the opposite rubberizing cap 216 of opening orientation and lower rubberizing cap 217 integrated into one piece formed, and the compactness between piston and the cylinder body 209 is good, and the seal is splendid. Realize inclosed through a packing ring between every piston of current pneumatic valve 201 and cylinder body 209, at the bottom of the gas tightness of single piston, easy gas leakage to can't guarantee the precision of opening and shutting of pneumatic valve 201, in order to overcome this defect, current pneumatic valve 201 adopts the integrated configuration that many pistons set up alternately, thereby guarantee the stability of the precision of opening and shutting, but the structural design who adopts many pistons is not only with high costs and the length of cylinder is also overlength, is unfavorable for the application of miniaturized equipment. The utility model provides a piston assembly's structural design has improved the compactness and the stability of piston assembly and cylinder effectively, is difficult for taking place the gas leakage problem, and pneumatic valve 201 adopts single piston cooperation cylinder alright realize that the high accuracy opens and shuts, has greatly shortened pneumatic valve 201's length, does benefit to miniaturized application.

Wherein the valve needle 207 is provided with a stroke limiting block 219 for limiting the maximum stroke of the valve needle 207 in the forward direction.

The valve needle 207 further comprises a stroke limit bolt 220 for limiting the maximum stroke of the valve needle 207 in the backward motion, the end of the stroke limit bolt 220 penetrates through the rear end cover 204 and then extends into the rear section of the cylinder 209, the end of the stroke limit bolt 220 is located right behind the rear end of the valve needle 207, and the stroke limit bolt is in threaded connection with the rear end cover 204. In practical application, the opening and closing degree of the valve glue outlet 206 can be controlled by rotating the distance between the stroke limit bolt 220 and the rear end of the valve needle 207.

The high-resilience member 211 is a high-resilience pressure spring or a high-resilience soft rubber member 221.

The high-resilience soft rubber piece 221 is formed by integrally molding a soft rubber sleeve body 222 and two anti-cracking rings 223, and the two anti-cracking rings 223 are respectively covered on two end faces of the soft rubber sleeve body 222.

Wherein, the anti-crack ring 223 is a screw thread type soft rubber ring. The design of preventing the ring 223 of splitting makes the junction of crack control ring 223 and flexible glue sleeve body 222 form the buffering recess behind flexible glue sleeve body 222 and two prevent the ring 223 integrated into one piece that splits, alleviates the destruction that axial direction's extrusion force produced flexible glue sleeve body 222, prevents the existence of ring 223 of splitting simultaneously and can form the power of dragging of certain circumferencial direction, reduces circumferencial direction's deflection when flexible glue sleeve body 222 receives the extrusion, places the tip fracture of flexible glue sleeve body 222.

An air outlet pipe 224 is connected to an air outlet end of the electromagnetic valve 225, and the air outlet pipe 224 is communicated with the valve air inlet 210 through the glue solution heater 226. Specifically, the solenoid valve 225 is a 4V110M5B Subdake solenoid valve 225.

The injection molding mold comprises an upper mold 227 and a lower mold 228, the lower mold 228 is provided with a plurality of lower mold cavities 230, the upper mold 227 is provided with a plurality of upper mold cavities 229 corresponding to the lower mold cavities 230, the injection molding mold further comprises a water gap 231 connected between two adjacent upper mold cavities 229 and/or two adjacent lower mold cavities 230, the upper mold 227 is further provided with an insertion hole 232 for the injection molding gun to extend into the edge of the upper side of the water gap 231 to complete injection, and the lower end of the insertion hole 232 is communicated with the water gap 231. Specifically, two ends of the nozzle 231 are respectively communicated with the opposite sides of the two adjacent upper mold cavities 229 and/or the two adjacent lower mold cavities 230, and the length of the nozzle 231 is less than 1 cm. The lance head 205 is shaped like an inverted cone, and the insertion hole 232 includes an inverted cone-shaped hole therein. The utility model provides an injection mold shortens the length of mouth of a river 231 through setting up spliced eye 232, mouth of a river 231 length is less than current LE-PE material injection mold's one tenth, the required pressure of LE-PE sizing material injection molding has greatly been reduced, the low pressure of the low pressure injecting glue rifle of cooperation this application is moulded plastics and high accuracy glue solution flow control design, the defect that current low pressure injecting glue rifle can't carry out the low pressure to LE-PE material and mould plastics has been overcome, pencil product injection molding's rejection rate has greatly been reduced. In practical application, the gun head 205 with the inverted cone structure design is inserted into the plug-in hole 232 with the inverted cone structure design, the foremost end of the gun head 205 extends into the edge of the water gap 231, the side surface of the gun head 205 is tightly attached to the inverted cone hole in the plug-in hole 232 to complete the sealing of the water gap 231, the LE-PE in the gun head 205 can be injected into the lower mold cavity 230 and the upper mold cavity 229 only with very low pressure to complete the injection molding, the welding points cannot be damaged, and the wiring harness cannot be broken.

The above embodiments are preferred implementations of the present application, and the present application can be implemented in other ways without departing from the spirit and scope of the present application.

Claims

1. The utility model provides an use low pressure injecting glue rifle of LD-PE material which characterized in that: comprises a pneumatic valve, a gun head fixed at the glue outlet end of the pneumatic valve, a solenoid valve used for controlling the opening and closing of the pneumatic valve and a glue solution heater used for preserving the heat of the glue solution, the pneumatic valve comprises a valve body, a front end cover fixed at the front end of the valve body and a rear end cover fixed at the rear end of the valve body, the front end cover is provided with a valve glue outlet and also comprises a valve needle which is arranged in the valve body and used for controlling the opening and closing of the valve glue outlet, the valve body is provided with a valve glue inlet for the glue solution to enter, the valve glue inlet is connected with the liquid outlet end of the glue solution heater, a cylinder body is arranged in the valve body, a piston assembly is arranged in the cylinder body, the rear end of the valve needle is fixedly connected with the piston assembly, the valve body is provided with a valve air inlet which is communicated with the foremost end of the cylinder body, the valve air inlet is communicated with the air outlet end of the electromagnetic valve, and the valve further comprises a high-resilience piece clamped between the piston assembly and the rear end face of the cylinder body.

2. The low-pressure glue injection gun using the LD-PE material as claimed in claim 1, wherein: still including the gear pump that is used for carrying the glue solution, the feed liquor end of glue solution heater is connected with the glan head, the glan head with the play liquid end of gear pump is connected.

3. The low-pressure glue injection gun using the LD-PE material as claimed in claim 1, wherein: piston assembly includes tensioning plate down, last tensioning plate and flexible glue seal, the flexible glue seal is formed by opening orientation opposite rubberizing cap and lower rubber cap integrated into one piece, it locates in the rubberizing cap to go up the tensioning plate cover, just it locates to go up the tensioning plate cover outside the needle, the tensioning plate cover is located down in the rubber cap down, still includes the T type lantern ring, T type lantern ring cover is located outside the needle, tensioning plate cover is located down outside the T type lantern ring.

4. The low-pressure glue injection gun using the LD-PE material as claimed in claim 3, wherein: the valve needle is provided with a stroke limiting block for limiting the maximum stroke of the valve needle in the forward motion.

5. The low-pressure glue injection gun using the LD-PE material as claimed in claim 3, wherein: the valve needle is characterized by further comprising a stroke limiting bolt used for limiting the maximum stroke of the valve needle in backward motion, the end of the stroke limiting bolt penetrates through the rear end cover and then extends into the rear section of the cylinder body, the end of the stroke limiting bolt is located right behind the rear end of the valve needle, and the stroke limiting bolt is in threaded connection with the rear end cover.

6. The low-pressure glue injection gun using the LD-PE material as claimed in claim 3, wherein: the high-resilience member is a high-resilience pressure spring or a high-resilience soft rubber member.

7. The low-pressure glue injection gun using the LD-PE material as claimed in claim 6, wherein: the high-resilience soft rubber piece is formed by integrally forming a soft rubber sleeve body and two anti-cracking rings, and the two anti-cracking rings are respectively covered on two end faces of the soft rubber sleeve body.

8. The low-pressure glue injection gun using the LD-PE material as claimed in claim 7, wherein: the anti-cracking ring is a circle of thread type soft rubber ring.

9. The low-pressure glue injection gun using the LD-PE material as claimed in claim 1, wherein: the air outlet end of the electromagnetic valve is connected with an air outlet pipe, and the air outlet pipe is communicated with an air inlet of the valve through the glue solution heater.