CN213321451U

CN213321451U - One-outlet three-needle valve type cold runner die holder

Info

Publication number: CN213321451U
Application number: CN202021455212.6U
Authority: CN
Inventors: 王军; 李锋
Original assignee: Dongguan Enzes Precision Machinery Co ltd
Current assignee: Dongguan Enzes Precision Machinery Co ltd
Priority date: 2020-07-21
Filing date: 2020-07-21
Publication date: 2021-06-01
Anticipated expiration: 2030-07-21

Abstract

The utility model belongs to the technical field of mould manufacturing, in particular to a three-pin valve type cold runner die holder, which comprises a heating plate, a heat insulation plate, a runner plate and a driving plate which are connected in sequence; at least one main runner is arranged in the runner plate, and the main runner sequentially penetrates through the heat insulation plate and the heating plate; an injection flow channel is further arranged in the flow channel plate, a first end of the main flow channel is communicated with the injection flow channel, a second end of the main flow channel extends to the end part of the heating plate, and the diameter of the second end of the main flow channel is gradually reduced to form a conical injection outlet; the heating plate, the heat insulation plate and the runner plate are provided with a cooling system around the main runner; a driving mechanism is arranged in the driving plate and corresponds to the main runner; the main flow passage is coaxially provided with a valve needle, and the diameter of the valve needle is smaller than that of the main flow passage; the valve needle is connected with the driving mechanism, the second end of the valve needle is a sealing end, and the driving mechanism drives the sealing end to seal the injection port or remove the sealing injection port; the cooling system cools the cold water nozzle to prevent the liquid silica gel from solidifying and blocking the injection port.

Description

One-outlet three-needle valve type cold runner die holder

Technical Field

The utility model belongs to the technical field of the mould is made, especially, relate to a go out three-needle valve formula cold runner die holder.

Background

In the production process of liquid silica gel products, a solid-state compression molding manufacturing process is generally adopted for production, and the steps of firstly batching, cutting and weighing, then compression molding, and finally edge removing and secondary vulcanization molding are required. The liquid silica gel is converted from liquid to solid, and a die holder unit used for solid-state compression molding only heats the die, so that the liquid silica gel in the die reaches a certain temperature, and the liquid silica gel is solidified and shaped. In the processing technology of the liquid silica gel product, the liquid silica gel is injected into a mold cavity through an injection molding machine, and then the liquid silica gel is heated, cured and shaped in the mold cavity. Liquid silica gel is thermosetting plastic, and liquid silica gel pours into the mould die cavity into, need heat the mould die cavity, makes liquid silica gel heat fixation type in the mould die cavity, but, when heating the mould die cavity, the heat can be transferred to the liquid silica gel runner of die holder in, makes liquid silica gel solidification easily, leads to the runner to block up. In the present mould, the mode of heat insulating board is often adopted to completely cut off the heat that the heating plate transmitted in the liquid silica gel runner in the mould, however, the thermal-insulated effect of above-mentioned mode is not good, and the time is long still makes the solidification of liquid silica gel in the liquid silica gel runner easily, causes the runner to block up.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a go out three-needle valve formula cold runner die holder aims at solving among the prior art liquid silica gel easy solidification in the mould die holder runner, causes the technical problem of runner jam.

In order to achieve the above object, an embodiment of the present invention provides a three-pin valve type cold runner mold base, which includes a heating plate, a heat insulation plate, a runner plate and a driving plate, which are connected in sequence; at least one main runner is arranged in the runner plate, and the main runner sequentially penetrates through the heat insulation plate and the heating plate; an injection flow channel is further arranged in the flow channel plate, a first end of the main flow channel is communicated with the injection flow channel, a second end of the main flow channel extends to the end part of the heating plate, and the diameter of the second end of the main flow channel is gradually reduced to form a conical injection outlet; the heating plate, the heat insulation plate and the runner plate are provided with cooling systems around the main runner;

at least one driving mechanism is arranged in the driving plate, and the driving mechanism is arranged corresponding to the main runner; the main flow passage is coaxially provided with a valve needle, and the diameter of the valve needle is smaller than that of the main flow passage; the first end of the valve needle is connected with the driving mechanism, the second end of the valve needle is a glue sealing end, and the driving mechanism drives the glue sealing end to seal the injection port or unseal the injection port.

Optionally, the one-out three-pin valve type cold runner die holder further comprises a cold water nozzle and a nozzle; one end of the cold water nozzle is mounted on the runner plate, and the injection nozzle is mounted at the other end of the cold water nozzle; the cooling system is provided with a double-spiral water inlet and outlet inside the cold water nozzle, and the double-spiral water inlet and outlet are respectively communicated with a water inlet runner and a water outlet runner in the runner plate; the main runner penetrates through the cold water nozzle and the axis of the injection nozzle in sequence, and the injection outlet is formed in the injection nozzle.

Optionally, the runner plate is provided with a water inlet runner and a water outlet runner; one ends of the water inlet flow channel and the water outlet flow channel extend to the side wall of the flow channel plate, and the other ends of the water inlet flow channel and the water outlet flow channel are communicated with the double-spiral water inlet and outlet of the cold water nozzle.

Optionally, the drive mechanism comprises a cylinder disposed within the drive plate; the piston is connected in the cylinder body in a sliding manner, and divides the interior of the cylinder body into an upper cavity and a lower cavity which are independent of each other; the driving plate is also provided with two air passages, one ends of the two air passages extend to the side wall of the driving plate, and the other ends of the two air passages are respectively communicated with the upper cavity and the lower cavity; the first end of the valve needle passes through the runner plate and the drive plate to be connected with the piston.

Optionally, a groove is dug in one end, away from the runner plate, of the driving plate, the cylinder body is installed in the groove, and a cover plate is hermetically covered on an opening of the groove, so that a sealed cavity is formed in the cylinder body.

Optionally, a connecting hole communicated with the cylinder is formed in one end, close to the runner plate, of the driving plate in a penetrating manner, and the first end of the valve needle passes through the connecting hole and is connected with the piston; the valve needle is provided with a valve needle sleeve in a sealing manner, and the valve needle sleeve covers the connecting hole in a sealing manner.

Optionally, the runner plate is provided with three main runners, and the three main runners are arranged side by side; the first ends of the injection flow channels extend to the side walls of the flow channel plate, and the second ends of the injection flow channels are communicated with the first ends of the three main flow channels through branch flow channels.

Optionally, the branch channel includes a first branch channel, two second branch channels and a third branch channel; the second end of the injection runner is communicated with the middle section of the first branch runner, the first ends of the two second branch runners are communicated with the two ends of the first branch runner, the second end of one of the second branch runners is communicated with the middle section of the third branch runner, and the two ends of the third branch runner and the second end of the other second branch runner are respectively communicated with the first ends of the three main runners.

Optionally, the first end of the injection runner is connected with a glue inlet nozzle.

Optionally, the runner plate is further uniformly provided with a plurality of cooling water channels for cooling the runner plate.

Compared with the prior art, the utility model discloses a go out three-needle valve formula cold runner die holder has one of following technological effect:

1. the heat insulating board blocks the heat of the heating plate from diffusing to the runner plate, and the runner plate can keep the temperature of the injection runner and the temperature of the main runner lower than the curing temperature of the liquid silica gel, so that the liquid silica gel in the material channel is prevented from being cured and blocking the material channel. And the heating plate, the heat insulation plate and the runner plate are arranged on the periphery of the main runner, and the cooling system cools the main runner to prevent the liquid silica gel in the main runner from solidifying and blocking the injection port.

2. Actuating mechanism can drive the needle and be in reciprocating sliding in the sprue, work as the sealed butt of the end of gluing of needle during the notes export, the notes export is in the closure state, liquid silica gel in the sprue can not be followed the notes export spills to prevent the phenomenon of leaking glue, simultaneously, avoid liquid silica gel extravagant, reduce the processing cost.

3. Liquid silica gel is followed the injection runner gets into, warp the subchannel flows in three the sprue, then liquid silica gel follows again the notes export is poured into the mould die cavity respectively into, can form three product in injection moulding, improves production efficiency greatly.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is an exploded schematic view of a three-pin valve type cold runner mold base according to the present invention.

Fig. 2 is a first cross-sectional view of the three-pin valve type cold runner mold base of the present invention.

Fig. 3 is an enlarged view of a portion a in fig. 2 according to the present invention.

Fig. 4 is a schematic view of the present invention showing a three-pin valve type cold runner mold base.

Fig. 5 is a second cross-sectional view of the three-pin valve type cold runner mold base of the present invention.

Fig. 6 is a third cross-sectional view of the three-pin valve type cold runner mold base of the present invention.

Fig. 7 is a fifth cross-sectional view of the three-pin valve type cold runner mold base of the present invention.

Fig. 8 is a sixth cross-sectional view of the three-pin valve type cold runner mold base of the present invention.

Wherein, in the figures, the respective reference numerals:

the three-needle valve type cold runner mold base 100 comprises a main runner 110, an injection outlet 111, an injection runner 120, a glue inlet nozzle 121, a branch runner 130, a first branch runner 131, a second branch runner 132, a third branch runner 133, a heating plate 200, a cooling system 210, a clearance groove 230, a clearance cavity 231, a heat insulation plate 300, a runner plate 400, a cold water nozzle 410, a nozzle 420, an O-shaped sealing ring 421, a water inlet runner 430, a water outlet runner 440, a cooling water channel 450, a driving plate 500, a connecting hole 501, a needle sleeve 502, a driving mechanism 510, a cylinder 520, an upper chamber 521, a lower chamber 522, a groove 523, a cover plate 524, a piston 530, an air passage 540, a needle 700, a gap 701 and a glue sealing end 710.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary and intended to explain the embodiments of the present invention and are not to be construed as limiting the present invention.

In the description of the embodiments of the present invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which is only for convenience in describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element so indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as fixed or detachable connections or as an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, referring to fig. 1 and 2, a three-pin valve type cold runner mold base 100 is provided, which comprises a heating plate 200, a heat insulation plate 300, a runner plate 400 and a driving plate 500 connected in sequence. The heating plate 200, the heat insulation plate 300, the runner plate 400 and the driving plate 500 are sequentially stacked, and the heating plate 200, the heat insulation plate 300, the runner plate 400 and the driving plate 500 are fixedly connected through a plurality of bolts, so that the installation is convenient.

Referring to fig. 1, 2 and 3, at least one main flow channel 110 is provided in the flow channel plate 400, the main flow channel 110 sequentially passes through the heat insulating plate 300 and the heating plate 400, and the main flow channel 110 is disposed in the same direction as the axes of the heating plate 200, the heat insulating plate 300 and the flow channel plate 400. An injection flow channel 120 is further disposed in the flow channel plate 400, a first end of the main flow channel 110 is communicated with the injection flow channel 120, a second end of the main flow channel 110 extends to an end of the heating plate 200, and a diameter of the second end of the main flow channel 110 is reduced to form a conical injection outlet 111.

Referring to fig. 1, 2 and 3, the heating plate 200 is connected to a core plate (not shown) of a mold, and the heating plate 200 is used to heat a cavity of the mold. An injection machine (not shown) injects the liquid silicone rubber from the injection runner 120 and the main runner 110, and injects the liquid silicone rubber from the injection outlet 111 into the mold cavity. The heat insulation plate 300 blocks heat of the heating plate 200 from being diffused to the runner plate 400, and the runner plate 400 can keep the temperatures of the injection runner 120 and the main runner 110 lower than the curing temperature of the liquid silica gel, thereby preventing the liquid silica gel in the material channel from being cured and blocking the material channel.

Referring to fig. 1, 2 and 3, the heating plate 200, the heat insulating plate 300 and the flow channel plate 400 are provided with a cooling system 210 around the main flow channel 110, and the cooling system 210 cools the main flow channel 110 to prevent the liquid silica gel in the main flow channel 110 from solidifying and blocking the injection port 111.

Referring to fig. 2, 3 and 4, at least one driving mechanism 510 is disposed in the driving plate 500, and the driving mechanism 510 is disposed corresponding to the primary flow channel 110. A valve needle 700 is coaxially disposed in the main flow channel 110, and the diameter of the valve needle 700 is smaller than that of the main flow channel 110, so that a gap 701 through which liquid silicone rubber passes is formed between the main flow channel 110 and the valve needle 700. The first end of the valve needle 700 is connected to the driving mechanism 510, the second end of the valve needle 700 is a sealing end 710, and the driving mechanism 510 drives the sealing end 710 to seal the injection outlet 111 or unseal the injection outlet 111.

When the mold is closed, the driving mechanism 510 drives the sealing end 710 to be away from the injection port 111, so as to contact and unseal the injection port 111, so that the injection port 111 is in an open state, and the feeding system injects the liquid silicone rubber from the injection runner 110 and the main runner 120 and injects the liquid silicone rubber from the injection port 111 into the mold cavity. After the cavity is filled with liquid silicone, the driving mechanism 510 drives the sealing end 710 to abut against the injection port 111 in a sealing manner, so that the injection port 111 is in a closed state. And simultaneously, heating the mold cavity to enable the liquid silica gel to be in a heat fixing type, and then opening the mold to take out a finished product. When the mold is opened, the sealing end 710 of the valve needle 700 is in sealing contact with the injection port 111, the injection port 111 is in a closed state, and the liquid silica gel in the main flow channel 110 cannot leak from the injection port 111, so that the phenomenon of gel leakage is prevented, meanwhile, the waste of the liquid silica gel is avoided, and the processing cost is reduced.

Referring to fig. 2, 3 and 4, the three-pin valve type cold runner mold base 100 further includes a cold water nozzle 410 and a nozzle 420. One end of the cold water tap 410 is installed at the runner plate 400, and the injection nozzle 420 is installed at the other end of the cold water tap 410. An empty avoiding groove 230 is formed in the heat insulation plate 300 and the heating plate 200 in a penetrating manner, the cold water nozzle 410 and the injection nozzle 420 are accommodated in the empty avoiding groove 230, an empty avoiding cavity 231 is formed between the cold water nozzle 410 and the empty avoiding groove 230 to separate the cold water nozzle 410 from the heating plate 200, and heat transfer is reduced. The main flow passage 110 sequentially penetrates the axes of the cold water nozzle 410 and the injection nozzle 420, and the injection port 111 is disposed in the injection nozzle 420. Cooling system 210 is equipped with double helix formula inlet outlet (not shown) in cold water tap 410 is inside, double helix formula inlet outlet with keep away cavity 231 intercommunication, get into the cooling water through double helix formula inlet outlet and cool off cold water tap 410 prevents to be located the solidification of liquid silica gel in sprue 110 blocks up notes export 111.

Further, referring to fig. 3 and 7, the runner plate 400 is provided with a water inlet runner 430 and a water outlet runner 440. One end of each of the water inlet channel 430 and the water outlet channel 440 extends to the side wall of the channel plate 400 and is connected to a cooling water circulation tank (not shown), and the other end of each of the water inlet channel 430 and the water outlet channel 440 is respectively communicated with the double-spiral water inlet and outlet of the cold water tap 410. The cooling water in the cooling water circulation tank flows into the cold water faucet 410 through the water inlet flow channel 430 to cool the cold water faucet 410, and the cooled water flows back to the cooling water circulation tank through the water outlet flow channel 440 to form a circulation. Wherein, the cooling water circulation tank is mature prior art.

Referring to fig. 2, 3, 4, 5 and 6, the driving mechanism 510 includes a cylinder 520 disposed in the driving plate 500. A piston 530 is slidably connected in the cylinder 520, and the piston 530 divides the interior of the cylinder 520 into an upper chamber 521 and a lower chamber 522 which are independent of each other. The driving plate 500 is further provided with two air passages 540, one ends of the two air passages 540 extend to the side wall of the driving plate 500, and the other ends of the two air passages 540 are respectively communicated with the upper chamber 521 and the lower chamber 522. A first end of the valve needle 700 is connected to the piston 530 through the flow channel plate 400 and the driving plate 500.

Specifically, referring to fig. 5 and 6, one end of each of the air passages 540 is connected to a pneumatic valve (not shown) connected to an air pump (not shown) through an air pipe. When the feeding system performs a material injection action, the feeding system supplies an electric signal to the pneumatic valve through a computer, the air passage of the pneumatic valve is switched, air enters the air passage 540 positioned in the lower chamber 522, so that the air pressure of the lower chamber 522 is greater than the air pressure of the upper chamber 521, the piston 530 is driven to move towards one side of the upper chamber 521, and the piston 530 drives the sealing end 710 of the valve needle 700 to open the injection port 111. After the injection action is completed, the pneumatic valve loses the electric signal, the air passage of the pneumatic valve is switched, the air passage 540 positioned in the upper chamber 521 admits air, the piston 530 is driven to move towards one side of the lower chamber 522, and therefore the piston 530 drives the glue sealing end 710 of the valve needle 700 to seal the injection port 111, and the injection port 111 is closed. Wherein, the pneumatic valve can be used for switching the air inlet position of high-pressure air according to an electric signal provided by a feeding system computer.

Further, referring to fig. 2, 3 and 4, a groove 523 is dug at one end of the driving plate 500 away from the runner plate 400, the cylinder body 520 is installed in the groove 523, and an opening of the groove 523 is hermetically covered with a cover plate 524, so that a sealed cavity is formed in the cylinder body 520. The cover plate 524 seals the opening of the groove 523 through a sealing ring, so that gas in the upper chamber 521 is prevented from leaking from the cover plate 524, meanwhile, the cover plate 524 is detachably fixed on the driving plate 500 through screws, and the cover plate 524 is in the detachable structure, so that the memory piston 530 of the cylinder 520 is conveniently mounted.

Further, referring to fig. 2, 3 and 4, a connection hole 501 communicating with the cylinder 520 is formed through one end of the driving plate 500 close to the flow channel plate 400, and a first end of the valve needle 700 is connected to the piston 530 through the connection hole 501. A valve needle sleeve 502 is hermetically sealed on the valve needle 700, and the valve needle sleeve 502 hermetically covers the connecting hole 501, so that gas in the lower chamber 522 is prevented from leaking from the connecting hole 501, and the normal operation of the driving mechanism 510 is ensured.

Referring to fig. 1 and 2, the flow channel plate 400 is provided with three main flow channels 110, and the three main flow channels 110 are arranged side by side. Correspondingly, the number of the driving mechanisms 510 is three, and the number of the cold water nozzles 410 and the number of the injection nozzles 420 are also three. Each of the cold water taps 410 is provided with a set of the water inlet channel 430 and the water outlet channel 440. The first ends of the injection flow channels 120 extend to the side walls of the flow channel plate 400, and the second ends of the injection flow channels 120 are communicated with the first ends of the three main flow channels 110 through the branch flow channels 130. Liquid silica gel enters from the injection runner 120, flows into three main runners 110 through the sub-runners 130, then the liquid silica gel is injected into the mold cavity from the injection port 111 respectively, three products can be formed in one-time injection molding, and the production efficiency is greatly improved.

Further, referring to fig. 2, 3 and 8, the branched flow path 130 includes a first branched flow path 131, two second branched flow paths 132 and a third branched flow path 133. The second end of the injection flow channel 120 is communicated with the middle section of the first flow dividing channel 131, and the injection flow channel 120 is perpendicular to the first flow dividing channel 131. First ends of the two second branch runners 132 are communicated with two ends of the first branch runner 131, a second end of one of the second branch runners 132 is communicated with the middle of the third branch runner 133, and the second branch runner 132 is perpendicular to the third branch runner 133. Both ends of the third branch flow channel 133 and a second end of the other second branch flow channel 132 are respectively communicated with the first ends of the three main flow channels 110.

Preferably, the vertical distance between one second sub-runner 132 connected to the third sub-runner 133 and the injection runner 120 is half of the vertical distance between the other second sub-runner 132 and the injection runner 120, so that the liquid silica gel injected from the injection runner 120 is delivered to the three main runners 110 through the sub-runners 130 with the same stroke, and the liquid silica gel is simultaneously injected into the mold cavity through the injection port 111, so that the three molding cavities in the mold are stressed in a balanced manner, and the quality of the three products is substantially consistent.

Further, referring to fig. 8, a first end of the injection runner 120 is connected to a glue inlet 121, and the glue inlet 121 is used for facilitating connection with an injection head of an injection molding machine.

Further, referring to fig. 7, the flow channel plate 400 is further uniformly provided with a plurality of cooling water channels 450, and the flow channel plate is cooled by the cooling water channels 450, so that the liquid silica gel in the injection flow channel 120, the main flow channel 110 and the sub-flow channels 130 in the flow channel plate is prevented from solidifying.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of the ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, its framework form can be nimble changeable, can derive series of products. But merely as a matter of simple deductions or substitutions, should be considered as belonging to the scope of patent protection of the present invention as determined by the claims submitted.

Claims

1. The three-needle valve type cold runner die holder is characterized by comprising a heating plate, a heat insulation plate, a runner plate and a driving plate which are sequentially connected; at least one main runner is arranged in the runner plate, and the main runner sequentially penetrates through the heat insulation plate and the heating plate; an injection flow channel is further arranged in the flow channel plate, a first end of the main flow channel is communicated with the injection flow channel, a second end of the main flow channel extends to the end part of the heating plate, and the diameter of the second end of the main flow channel is gradually reduced to form a conical injection outlet; the heating plate, the heat insulation plate and the runner plate are provided with cooling systems around the main runner;

2. The one-out three-pin valve type cold runner die holder of claim 1, wherein: the one-outlet three-needle valve type cold runner die holder also comprises a cold water nozzle and a nozzle; one end of the cold water nozzle is mounted on the runner plate, and the injection nozzle is mounted at the other end of the cold water nozzle; the cooling system is provided with a double-spiral water inlet and outlet inside the cold water nozzle, and the double-spiral water inlet and outlet are respectively communicated with a water inlet runner and a water outlet runner in the runner plate; the main runner penetrates through the cold water nozzle and the axis of the injection nozzle in sequence, and the injection outlet is formed in the injection nozzle.

3. The one-out three-pin valve type cold runner die holder of claim 2, wherein: the runner plate is provided with a water inlet runner and a water outlet runner; one ends of the water inlet flow channel and the water outlet flow channel extend to the side wall of the flow channel plate, and the other ends of the water inlet flow channel and the water outlet flow channel are respectively communicated with the double-spiral water inlet and outlet of the cold water nozzle.

4. The one-out three-pin valve type cold runner die holder of any one of claims 1-3, wherein: the driving mechanism comprises a cylinder body arranged in the driving plate; the piston is connected in the cylinder body in a sliding manner, and divides the interior of the cylinder body into an upper cavity and a lower cavity which are independent of each other; the driving plate is also provided with two air passages, one ends of the two air passages extend to the side wall of the driving plate, and the other ends of the two air passages are respectively communicated with the upper cavity and the lower cavity; the first end of the valve needle passes through the runner plate and the drive plate to be connected with the piston.

5. The one-out three-pin valve type cold runner die holder of claim 4, wherein: the one end that the drive plate kept away from the runner plate digs is equipped with the recess, the cylinder body install in the recess, the opening sealing cover of recess has a apron, makes form sealed cavity in the cylinder body.

6. The one-out three-pin valve type cold runner die holder of claim 4, wherein: a connecting hole communicated with the cylinder body is formed in one end, close to the runner plate, of the driving plate in a penetrating mode, and the first end of the valve needle penetrates through the connecting hole to be connected with the piston; the valve needle is provided with a valve needle sleeve in a sealing manner, and the valve needle sleeve covers the connecting hole in a sealing manner.

7. The one-out three-pin valve type cold runner die holder of any one of claims 1-3, wherein: the flow channel plate is provided with three main flow channels which are arranged side by side; the first ends of the injection flow channels extend to the side walls of the flow channel plate, and the second ends of the injection flow channels are communicated with the first ends of the three main flow channels through branch flow channels.

8. The one-out three-pin valve type cold runner die holder of claim 7, wherein: the branch flow passage comprises a first branch flow passage, two second branch flow passages and a third branch flow passage; the second end of the injection runner is communicated with the middle section of the first branch runner, the first ends of the two second branch runners are communicated with the two ends of the first branch runner, the second end of one of the second branch runners is communicated with the middle section of the third branch runner, and the two ends of the third branch runner and the second end of the other second branch runner are respectively communicated with the first ends of the three main runners.

9. The one-out three-pin valve type cold runner die holder of claim 7, wherein: the first end of the injection runner is connected with a glue inlet nozzle.

10. The one-out three-pin valve type cold runner die holder of claim 7, wherein: the runner plate is also uniformly provided with a plurality of cooling water channels for cooling the runner plate.