CN112936754A

CN112936754A - Injection mold for plastic pipe fitting with inner ring groove

Info

Publication number: CN112936754A
Application number: CN202110243397.7A
Authority: CN
Inventors: 张金凤
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-03-05
Filing date: 2021-03-05
Publication date: 2021-06-11

Abstract

The invention relates to the technical field of dies, in particular to an injection mold for plastic pipe fittings with inner ring grooves, which comprises a bottom plate, wherein the left side and the right side of the top end of the bottom plate are fixedly provided with side plates, the top ends of the two side plates are fixedly provided with a top plate together, the middle part of the bottom end of the top plate is fixedly provided with a cover plate, the middle part of the bottom end of the cover plate is vertically and fixedly provided with a round rod, a cavity is arranged in the round rod, and the upper part of the outer side of the round rod is fixedly sleeved with a ring sleeve. Is worthy of popularization and application.

Description

Injection mold for plastic pipe fitting with inner ring groove

Technical Field

The invention relates to the technical field of molds, in particular to an injection mold for an inner annular groove plastic pipe fitting.

Background

The industrial production of the die is used for obtaining various dies and tools of required products by methods such as injection molding, blow molding, extrusion, die casting or forging forming, smelting, stamping and the like. In short, a mold is a tool used to make a shaped article, the tool being made up of various parts, different molds being made up of different parts. The processing of the appearance of an article is realized mainly through the change of the physical state of a formed material. The element has the name of "industrial mother".

The plastic pipe spare need use injection mold at the in-process of production, current injection mold is when carrying out interior annular groove plastic pipe spare production, thereby the condition that blocks appears in the interior annular groove that makes the pipe spare after the shaping can appear with the mould because the reason of mould self shape makes and is not convenient for take off to the pipe spare, it is comparatively inconvenient to use, and current mould can not accelerate the cooling that plastics melt when using and make the time overlength of required waiting influence work efficiency, and current mould can not eliminate the pipe spare quality that makes production out to the bubble in melting, we propose an interior annular groove plastic pipe spare injection mold for this and solve this type of problem.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides an injection mold for an inner annular groove plastic pipe fitting.

In order to achieve the purpose, the invention adopts the following technical scheme:

an injection mold for plastic pipe fittings with inner ring grooves is designed, and comprises a bottom plate, wherein side plates are fixedly arranged on the left side and the right side of the top end of the bottom plate, a top plate is fixedly arranged at the top ends of the two side plates together, a cover plate is fixedly arranged in the middle of the bottom end of the top plate, a round rod is vertically and fixedly arranged in the middle of the bottom end of the cover plate, a cavity is arranged in the round rod, a ring sleeve is fixedly sleeved on the upper portion of the outer side of the round rod, air pipes communicated with the inner part of the ring sleeve are fixedly arranged on the inner walls of the left side and the right side of the ring sleeve, one end, away from the ring sleeve, of each air pipe extends into the inner part of the round rod, an air cylinder is fixedly arranged in the middle of the top end of the bottom plate, a support plate is fixedly arranged at the top end of the air cylinder rod of, the vertical fixed mounting in top rear side of support plate has the push rod, the inside of barrel is equipped with the push pedal, the bottom that the top of push rod passed roof and barrel extends to its inside bottom fixed connection with the push pedal, the top middle part fixed mounting of support plate has the mould, the left and right sides of mould all is equipped with defoaming mechanism, defoaming mechanism's bottom is equipped with the box, the inside of mould is equipped with the cavity, the rear side of box is through the rear side lower part fixed connection of first water pipe with the mould, the one end that first water pipe kept away from the box extends to in the cavity, the front side lower part fixed mounting of mould has the water tank, the front side fixed mounting of water tank has the water pump, the bottom of water pump passes through the second water pipe and communicates with the inside of water tank, the top left side of water tank is equipped with the filler pipe, the top fixed mounting of water pump has the shunt tubes, the top of shunt tubes communicates with the front, the mould is characterized in that a return pipe communicated with an inner cavity of the mould is fixedly mounted on the upper portion of the front side of the mould, the bottom end of the return pipe penetrates through the middle of the top end of the water tank and extends to the inside of the water tank, a cooling device is arranged on the bottom wall of the water tank, injection pipes are fixedly mounted on the left side and the right side of the top end of the cover plate, the bottom end of each injection pipe penetrates through the top end of the cover plate and is communicated with the inside of the mould, and the top end of.

Preferably, the defoaming mechanism comprises a pair of fixed plates, the fixed plates are fixedly arranged on the outer side of the die, a limiting plate is fixedly arranged between the fixed plates, a reciprocating lead screw is vertically and movably arranged between the fixed plates, a slider is sleeved outside the reciprocating lead screw, a limiting rod is fixedly arranged in the middle of one side, away from the die, of the slider, a limiting groove is formed in the inner side of the limiting plate, one end, close to the limiting groove, of the limiting rod extends to the inside of the limiting groove, the bottom end of the reciprocating lead screw penetrates through the fixed plates and the top end of the box body and extends to the inside of the box body to be movably connected with the bottom wall of the box body, a plurality of driving plates are fixedly arranged around the outer lower part of the reciprocating lead screw in an equidistant mode, a mounting frame is fixedly arranged on one, the utility model discloses a fixed mounting of mould, including the collision pole, the mould is kept away from to the back of collision pole, and the inboard rear fixed mounting of mounting panel has first lug, the inboard rear fixed mounting of slider has the attachment strap, one side fixed mounting that the front of attachment strap is close to the mould has the riser, one side fixed mounting that the mould was kept away from to the riser has the second lug, the outside of collision pole is close to one side fixed cover of mould and is equipped with the clamp plate, the outside of collision pole just is located and is equipped with the spring between clamp plate and the mounting bracket.

Preferably, the opposite sides of the first bump and the second bump are both provided with round ends.

Preferably, the left side and the right side on the top end of the bottom plate are fixedly provided with a pair of stabilizer bars, the stabilizer bars on the same side are distributed in a front-back manner, the top end of the carrier plate is provided with a stabilizing hole matched with the stabilizer bars, and the top ends of the stabilizer bars penetrate through the stabilizing hole and extend to the upper side of the carrier plate.

Preferably, the top end of the mold is provided with an annular groove, an annular plate is arranged inside the annular groove, and the top end of the annular plate is fixedly connected with the bottom end of the cover plate.

Preferably, the outer side of the push plate is sleeved with a sealing rubber sleeve.

Preferably, the annular sleeve is an annular hollow rubber sleeve member made of fluororubber.

The invention provides an injection mold for plastic pipe fittings with inner ring grooves, which has the beneficial effects that:

1. the invention can start the cylinder to extend the cylinder rod to drive the carrier plate to ascend so as to drive the mould to ascend, when the carrier plate ascends, the carrier plate can drive the push rod and the push plate to ascend so as to push the gas in the cylinder body outwards so as to lead the gas to enter the interior of the round rod through the connecting pipe, the mould is finally attached to the cover plate along with the continuous ascending of the carrier plate, simultaneously, the round rod is filled with the gas to expand the annular sleeve to be annular, plastic solution is poured into the mould through the injection pipe, after the space formed by the round rod and the mould is filled with melt liquid, the water pump and the cooling device are started, at the moment, the water in the water tank is pumped out by the water pump through the second water pipe to be injected into the shunt pipe, then enters the first water pipe into the box body through the shunt pipe, and is injected into the cavity in the mould through the first water pipe, and finally is filled with the cavity along with the continuous injection of the water, the cooling of the plastic pipe is accelerated, so that the forming of the plastic pipe is accelerated, the opening of an inner ring groove on the inner wall of the plastic pipe can be realized through the ring sleeve, the inner ring groove can be formed in the plastic pipe, water absorbing heat in the cavity flows back into the water tank through the return pipe along with the continuous injection of the water, and the water is pumped out again after being cooled by the cooling device and injected into the cavity to realize the cooling forming of the plastic pipe accelerated by water circulation cooling;

2. when water enters the box body, the drive plate is continuously impacted to drive the reciprocating lead screw to rotate, when the reciprocating lead screw rotates, the slide block can be driven to do reciprocating motion along the surface of the slide block, the slide block is limited to avoid rotating through the matching of the limiting rod and the limiting groove, so that the slide block can only do reciprocating motion up and down, when the slide block moves, the lapping plate can be driven to do motion with the slide block, so that the vertical plate and the second lug can be driven to do motion with the slide block, when the second lug moves, the second lug can be in contact with the first lug to generate relative sliding with the first lug, so that the second lug can be extruded, the first lug can be driven to move towards the direction close to the slide block, so that the mounting plate and the collision rod can move with the first lug, when the collision rod moves, the press plate can be driven to do motion with the first lug, so that the spring is compressed to deform to generate acting force, when the second lug moves The collision rods collide with the dies to vibrate so that bubbles contained in the molten liquid in the dies are eliminated, the bubbles are eliminated, the second bumps are continuously contacted and separated with the first bumps from top to bottom, and therefore the collision rods continuously collide with the dies so that the bubbles in the molten liquid are continuously vibrated and eliminated, and the quality of the formed plastic pipe is better;

3. after the plastic pipe is formed, the cylinder can be started to shorten the cylinder rod of the cylinder so as to drive the support plate and the die to descend and further to enable the plastic pipe to leak, the push rod and the push plate are driven to descend when the support plate descends so as to pump air into the cylinder body and further to pump air out of the round rod so as to enable the annular sleeve to be shrunken again, so that the annular sleeve is separated from an inner annular groove formed in the inner wall of the plastic pipe, and at the moment, the plastic pipe can be taken down to realize production of the plastic pipe and is convenient to take down the plastic;

the invention can realize the production of the plastic pipe with the inner ring groove, is convenient to take down the plastic pipe, saves time and labor, can realize the cooling and the cooling of water circulation and accelerate the cooling forming of the plastic pipe, greatly shortens the waiting time, increases the working efficiency, and can drive the collision rod to collide with the mould to continuously vibrate and eliminate the bubbles in the molten liquid while realizing the cooling, thereby leading the quality of the formed plastic pipe to be better, and being worthy of popularization and use.

Drawings

FIG. 1 is a schematic structural view of an injection mold for plastic pipes with inner annular grooves according to the present invention;

FIG. 2 is a schematic structural diagram of an injection mold for an inner annular groove plastic pipe fitting according to the present invention;

FIG. 3 is a schematic view of a rear cross-sectional view of an injection mold for an inner annular groove plastic pipe fitting according to the present invention;

FIG. 4 is a schematic right sectional view of an injection mold for an inner annular groove plastic pipe fitting according to the present invention;

FIG. 5 is a schematic structural diagram of a defoaming mechanism according to the present invention;

FIG. 6 is a schematic top sectional view of a defoaming mechanism according to the present invention;

FIG. 7 is a schematic view of a front view of a slider and strap assembly according to the present invention;

fig. 8 is a rear view of the crash bar according to the present invention.

In the figure: the device comprises a bottom plate 1, a side plate 2, a top plate 3, a cover plate 4, a round rod 5, a circular sleeve 6, a cylinder 7, a support plate 8, a cylinder body 9, a connecting pipe 10, a push rod 11, a push plate 12, a mold 13, a defoaming mechanism 14, a fixing plate 1401, a limiting plate 1402, a reciprocating lead screw 1403, a slider 1404, a limiting rod 1405, a driving plate 1406, a mounting frame 1407, a collision rod 1408, a mounting plate 1409, a first bump 1410, a butt plate 1411, a vertical plate 1412, a second bump 1413, a pressure plate 1414, a spring 1415, a box body 15, a first water pipe 16, a water tank 17, a water pump 18, a second water pipe 19, a flow dividing pipe 20, a return pipe 21, a cooling device 22, an injection.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to fig. 1-8, an inner ring groove plastic pipe fitting injection mold, comprising a base plate 1, the equal fixed mounting in the left and right sides on the top of bottom plate 1 has curb plate 2, the common fixed mounting in top of two curb plates 2 has roof 3, the bottom middle part fixed mounting of roof 3 has apron 4, the vertical fixed mounting in bottom middle part of apron 4 has round bar 5, the inside of round bar 5 is equipped with the cavity, the fixed cover in outside upper portion of round bar 5 is equipped with ring cover 6, the equal fixed mounting in the left and right sides inner wall of ring cover 6 has the trachea that is linked together rather than inside, ring cover 6 specifically is its material of annular hollow rubber cover component and is fluororubber, fluororubber's high temperature resistance can be good, make can not fused the liquid.

The one end that the ring cover 6 was kept away from to the trachea extends to the inside of round bar 5, the top middle part fixed mounting of bottom plate 1 has cylinder 7, the cylinder pole top fixed mounting of cylinder 7 has support plate 8, the equal fixed mounting in the left and right sides on the top of bottom plate 1 has a pair of stabilizer bar 24, be front and back distribution between the pair of stabilizer bar 24 of homonymy, support plate 8's top is seted up with 24 assorted stabilizer holes of stabilizer bar, stabilizer bar 24's top is passed the stabilizer hole and is extended to the top of support plate 8, the process that makes support plate 8 rise is more stable through the cooperation of stabilizer bar 24 with the stabilizer hole, avoid appearing rocking, and can prevent mould 13 and apron.

The top middle part fixed mounting of roof 3 has barrel 9, the top middle part fixed mounting of barrel 9 has the connecting pipe 10 that is linked together rather than inside, the one end that barrel 9 was kept away from to connecting pipe 10 passes roof 3 and the inside intercommunication of round bar 5 and round bar 5, the vertical fixed mounting in top rear side of support plate 8 has push rod 11, the inside of barrel 9 is equipped with push pedal 12, the outside cover of push pedal 12 is equipped with the sealing rubber cover, through the leakproofness between the multiplicable push pedal 12 of sealing rubber cover and the barrel 9.

The bottom that roof 3 and barrel 9 were passed on the top of push rod 11 extends to its inside bottom fixed connection with push pedal 12, and the top middle part fixed mounting of support plate 8 has mould 13, and the ring channel has been seted up on the top of mould 13, and the inside of ring channel is equipped with annular plate 25, and the top of annular plate 25 and the bottom fixed connection of apron 4 make apron 4 inseparabler with the combination of mould 13 through the cooperation of annular plate 25 and ring channel, appear the weeping when avoiding moulding plastics.

The defoaming mechanism 14 is arranged on the left side and the right side of the die 13, the box body 15 is arranged at the bottom end of the defoaming mechanism 14, the defoaming mechanism 14 comprises a pair of fixing plates 1401, the fixing plates 1401 are fixedly arranged on the outer side of the die 13, a limiting plate 1402 is fixedly arranged between the fixing plates 1401, a reciprocating lead screw 1403 is vertically movably arranged between the fixing plates 1401, a slider 1404 is sleeved outside the reciprocating lead screw 1403, a limiting rod 1405 is fixedly arranged in the middle of one side of the slider 1404, which is far away from the die 13, a limiting groove is formed in the inner side of the limiting plate 1402, one end of the limiting rod 1405, which is close to the limiting groove, extends into the limiting groove, the bottom end of the reciprocating lead screw 1403 penetrates through the fixing plates 1401 and the top end of the box body 15 to extend into the box body 15 and is movably connected with the bottom wall of the box body, a plurality, a collision rod 1408 is transversely inserted into the mounting frame 1407, a mounting plate 1409 is fixedly mounted on one side of the back surface of the collision rod 1408, which is far away from the mold 13, a first bump 1410 is fixedly mounted on the inner side of the mounting plate 1409, an attachment plate 1411 is fixedly mounted behind the inner side of the slider 1404, a vertical plate 1412 is fixedly mounted on one side of the front surface of the attachment plate 1411, which is near to the mold 13, a second bump 1413 is fixedly mounted on one side of the vertical plate 1412, which is far away from the mold 13, and opposite sides of the first bump 1410 and the second bump 1413 are both provided with round ends, so that when the second bump 1413 is in contact with the first bump 1410, relative sliding can be generated, and the first bump 1410 is squeezed to move in a direction.

A pressing plate 1414 is fixedly sleeved on one side, close to the die 13, of the outer portion of the collision rod 1408, a spring 1415 is sleeved on the outer portion of the collision rod 1408 and between the pressing plate 1414 and the mounting frame 1407, when the reciprocating screw 1403 rotates, the slider 1404 can be driven to reciprocate along the surface of the slider 1404, the slider 1404 is limited from rotating by the cooperation of the limiting rod 1405 and the limiting groove, so that the slider can only reciprocate up and down, when the slider 1404 moves, the strap 1411 is driven to move along with the slider, the upright plate 1412 and the second bump 1413 are driven to move along with the slider, when the second bump 1413 moves, the second bump 1410 is in contact with the first bump 1410 to slide relative to the first bump to extrude the first bump 1410 to move in the direction close to the slider 1404, so that the mounting plate 1409 and the collision rod 1408 move along with the slider, when the collision rod 1408 moves, the pressing plate 1414 moves along with the first bump 1410, so that the spring 1415 is compressed, when the second bump 1413 moves to be separated from the first bump 1410, the spring 1415 releases the acting force to drive the pressure plate 1414 to move away from the slide 1404, so as to drive the collision rod 1408 to move along with the pressure plate 1414, so that the collision rod 1408 collides with the mold 13 to vibrate, and bubbles contained in the molten liquid in the mold are eliminated, so that the bubbles are eliminated, and the quality of the molded plastic pipe is better.

A cavity is arranged in the mold 13, the rear side of the box body 15 is fixedly connected with the lower part of the rear side of the mold 13 through a first water pipe 16, one end of the first water pipe 16, which is far away from the box body 15, extends into the cavity, the lower part of the front side of the mold 13 is fixedly provided with a water tank 17, the front side of the water tank 17 is fixedly provided with a water pump 18, the bottom end of the water pump 18 is communicated with the inside of the water tank 17 through a second water pipe 19, the left side of the top end of the water tank 17 is provided with a water adding pipe, the top end of the water pump 18 is fixedly provided with a shunt pipe 20, the top ends of the shunt pipes 20 are respectively communicated with the front sides of the pair of box bodies 15, the upper part of the front side of the mold 13 is fixedly provided with a return pipe 21 communicated with the inner cavity, the bottom end of the return pipe 21 passes through the middle part of the top end of the water tank 17 and extends into the, the top end of the injection pipe 23 extends through the top plate 3 to the upper side, and the plastic melt can be poured into the mold 13 through the injection pipe 23.

The working principle is as follows: the cylinder 7 can be started to extend the cylinder rod to drive the carrier plate 8 to ascend so as to drive the mold 13 to ascend, when the carrier plate 8 ascends, the push rod 11 and the push plate 12 are driven to ascend so as to push the gas in the cylinder 9 outwards so as to enable the gas to enter the interior of the round rod 5 through the connecting pipe 10, the mold 13 is finally attached to the cover plate 4 along with the continuous ascending of the carrier plate 8, meanwhile, the round rod 5 is filled with the gas to prop the annular sleeve 6 to be annular, plastic solution is poured into the mold 13 through the injection molding pipe 23, after the space formed by the round rod 5 and the mold 13 is filled with the melting liquid, the water pump 18 and the cooling device 22 are started, at the moment, the water in the water tank 17 is pumped out through the second water pipe 19 and is injected into the shunt pipe 20 by the water pump 18, then enters the box body 15 through the shunt pipe 20 and then enters the first water pipe 16, and is injected into the cavity in the mold, the cavity is filled with water continuously, heat on the inner wall of the mold 13 is absorbed by the water, cooling of the plastic solution is achieved, cooling of the plastic solution is accelerated, forming of the plastic pipe is accelerated, an inner ring groove on the inner wall of the plastic pipe can be formed through the annular sleeve 6, water absorbing heat in the cavity flows back into the water tank 17 through the backflow pipe 21 along with continuous injection of the water, the water is pumped out again after being cooled by the cooling device 22 and injected into the cavity to achieve cooling forming of the water circulation cooling and accelerating plastic pipe, the driving plate 1406 is impacted continuously to drive the reciprocating lead screw 1403 to rotate after the water enters the box body 15, the sliding block 1404 can be driven to reciprocate downwards along the surface of the sliding block 1403 when the reciprocating lead screw 1403 rotates, the sliding block 1404 is limited to avoid rotating to enable the sliding block to only to reciprocate upwards and downwards through the matching of the limiting rod 1405 and the limiting groove, when the slide block 1404 moves, the strap 1411 is driven to move along with the slide block 1404, so that the upright plate 1412 and the second bump 1413 are driven to move along with the slide block, when the second bump 1413 moves, the second bump 1413 is in contact with the first bump 1410 to slide relative to the first bump 1410, so that the first bump 1410 is driven to move in a direction close to the slide block 1404 to realize the movement of the mounting plate 1409 and the collision rod 1408, when the collision rod 1408 moves, the pressure plate 1414 is driven to move along with the first bump 1408, so that the spring 1415 is compressed to deform to generate an acting force, when the second bump 1413 moves to be separated from the first bump 1410, the spring 1415 releases the acting force to drive the pressure plate 1414 to move in a direction away from the slide block 1404, so that the collision rod 1408 is driven to move along with the collision rod 1408, so that the collision rod 1408 collides with the mold 13 to vibrate, so that bubbles contained in the molten liquid are eliminated, so that the bubbles are eliminated, and the second bump A plurality of collision pole 1408 bumps mould 13 and makes its bubble that constantly shakes in the elimination melt, thereby make the quality of fashioned plastic tubing better, after the shaping, can start cylinder 7 and make its cylinder pole shorten thereby make to drive support plate 8 and mould 13 decline thereby make to spill the plastic tubing, thereby drive push rod 11 and push pedal 12 decline when support plate 8 descends and make to bleed in barrel 9 and make the interior gas of round bar 5 take out and make ring cover 6 become flat once more, thereby make and leave the interior annular groove that forms on the plastic tubing inner wall, can take off the plastic tubing this moment and realize the production to the plastic tubing, and make and be convenient for take off the plastic tubing.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. An injection mold for plastic pipe fittings with inner ring grooves comprises a bottom plate (1) and is characterized in that side plates (2) are fixedly mounted on the left side and the right side of the top end of the bottom plate (1), a top plate (3) is fixedly mounted on the top ends of the two side plates (2) together, a cover plate (4) is fixedly mounted in the middle of the bottom end of the top plate (3), a round rod (5) is vertically and fixedly mounted in the middle of the bottom end of the cover plate (4), a cavity is arranged in the round rod (5), a ring sleeve (6) is fixedly sleeved on the upper portion of the outer side of the round rod (5), air pipes communicated with the interior of the round sleeve (6) are fixedly mounted on the inner walls of the left side and the right side of the round sleeve (6), one end, far away from the ring sleeve (6), of each air pipe extends into the interior of the round rod (5), an air cylinder (7) is fixedly, the top end middle part of the top plate (3) is fixedly provided with a barrel body (9), the top end middle part of the barrel body (9) is fixedly provided with a connecting pipe (10) communicated with the inside of the barrel body, one end, far away from the barrel body (9), of the connecting pipe (10) penetrates through the top plate (3) and the round rod (5) and is communicated with the inside of the round rod (5), the top end rear side of the support plate (8) is vertically and fixedly provided with a push rod (11), the inside of the barrel body (9) is provided with a push plate (12), the top end of the push rod (11) penetrates through the bottom ends of the top plate (3) and the barrel body (9) and extends to the inside of the bottom end of the top plate and the bottom end of the push plate (12), the top end middle part of the support plate (8) is fixedly provided with a mold (13), the left side and the right side of the mold (13, the rear side of box (15) is through the rear side lower part fixed connection of first water pipe (16) and mould (13), the one end that box (15) were kept away from in first water pipe (16) extends to the cavity, the front side lower part fixed mounting of mould (13) has water tank (17), the front side fixed mounting of water tank (17) has water pump (18), the bottom of water pump (18) is through the inside intercommunication of second water pipe (19) with water tank (17), the top left side of water tank (17) is equipped with the filler pipe, the top fixed mounting of water pump (18) has shunt tubes (20), the top of shunt tubes (20) communicates with the front side of a pair of box (15) respectively, the front side upper portion fixed mounting of mould (13) has back flow (21) rather than the inside cavity is linked together, the top middle part that water tank (17) was passed to the bottom of back flow (21) extends to inside, the diapire of water tank (17) is equipped with cooling device (22), the equal fixed mounting in the left and right sides on the top of apron (4) has injection molding pipe (23), the top that apron (4) were passed to the bottom of injection molding pipe (23) communicates with the inside of mould (13), the top of injection molding pipe (23) is passed roof (3) and is extended to its top.

2. The injection mold for the plastic pipe fitting with the inner annular groove as claimed in claim 1, wherein the defoaming mechanism (14) comprises a pair of fixing plates (1401), the pair of fixing plates (1401) are fixedly installed on the outer side of the mold (13), a limiting plate (1402) is fixedly installed between the pair of fixing plates (1401), a reciprocating lead screw (1403) is vertically movably installed between the pair of fixing plates (1401), a sliding block (1404) is sleeved outside the reciprocating lead screw (1403), a limiting rod (1405) is fixedly installed in the middle of one side, far away from the mold (13), of the sliding block (1404), a limiting groove is formed in the inner side of the limiting plate (1402), one end, close to the limiting groove, of the limiting rod (1405) extends to the inside of the limiting groove, the bottom end of the reciprocating lead screw (1403) penetrates through the fixing plates (1401) and the top end of the box body (15) to extend to the inside of the box body, a plurality of driving plates (1406) are fixedly installed on the lower portion of the outer side of the reciprocating lead screw (1403) in an equidistant surrounding mode, a mounting frame (1407) is fixedly installed on one side, close to the sliding block (1404), of the die (13) from top to bottom in an equidistant surrounding mode, an impact rod (1408) transversely penetrates through the mounting frame (1407), a mounting plate (1409) is fixedly installed on one side, far away from the die (13), of the back face of the impact rod (1408), a first bump (1410) is fixedly installed on the inner side of the mounting plate (1409), a butt plate (1411) is fixedly installed on the rear portion of the inner side of the sliding block (1404), a vertical plate (1412) is fixedly installed on one side, close to the die (13), of the front face of the butt plate (1411), a second bump (1413) is fixedly installed on one side, far away from the die (13), of the outer portion, close to the die, a spring (1415) is sleeved outside the collision rod (1408) and between the pressure plate (1414) and the mounting frame (1407).

3. The injection mold for plastic pipe with inner ring groove as claimed in claim 2, wherein the opposite sides of the first projection (1410) and the second projection (1413) are rounded.

4. The injection mold for the plastic pipe fitting with the inner ring groove as claimed in claim 1, wherein a pair of stabilizer bars (24) are fixedly mounted on each of the left and right sides of the top end of the bottom plate (1), the pair of stabilizer bars (24) on the same side are distributed in a front-back manner, a stabilizer hole matched with the stabilizer bar (24) is formed in the top end of the carrier plate (8), and the top end of the stabilizer bar (24) extends to the upper side of the carrier plate (8) through the stabilizer hole.

5. The injection mold for the plastic pipe with the inner annular groove as claimed in claim 1, wherein the top end of the mold (13) is provided with the annular groove, the annular groove is internally provided with the annular plate (25), and the top end of the annular plate (25) is fixedly connected with the bottom end of the cover plate (4).

6. The injection mold for the plastic pipe fitting with the inner ring groove as claimed in claim 1, wherein a sealing rubber sleeve is sleeved outside the push plate (12).

7. The injection mold for the plastic pipe fitting with the inner annular groove as claimed in claim 1, wherein the annular sleeve (6) is an annular hollow rubber sleeve member made of fluororubber.