A leak-proof nozzle for a two-color injection molding machine

Abstract

The present invention is applicable to the technical field of injection molding machines, and provides a leak-proof nozzle for a two-color injection molding machine, which includes a nozzle body and a flow channel arranged inside. An end closing mechanism and an anti-backflow mechanism are arranged in the flow channel, respectively used to control the movement trajectory of the liquid in the flow channel and limit the flow rate after the mixing of the two liquids. The moving speed of the elastic adjustment mechanism automatically changes with the liquid flow rate. The quick shut-off mechanism is connected to the cross bar in the elastic adjustment mechanism and is used to complete the shut-off work of the liquid. This application has multiple anti-backflow functions, can independently control the flow of the two liquids before and after contact, making the nozzle more controllable and safer during operation, can achieve quick shut-off of the liquid at the end, effectively avoiding the liquid remaining at the end of the nozzle from flowing outwards, and simply stirring the injection liquid by using the thrust of the injection liquid itself. When the thrust changes, the finished product can have a richer color pattern to meet different usage requirements.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molding machines, and particularly relates to a leak-proof nozzle for a two-color injection molding machine. Background Art

[0002] A two-color injection molding machine is an injection molding machine with two injection units, which can inject different varieties or colors of plastics into a mold simultaneously or successively to form a product, and can produce special appearance products with two colors or mixed colors, or plastic products with a composite structure.

[0003] At present, the used leak-proof nozzle realizes the blocking or opening of the flow channel during unilateral injection stopping or the circulation for injection during opening by setting a sliding sleeve and using the impact force of plastic flow and injection pressure to avoid plastic backflow. However, there is a problem of single blocking method. After the injection, some plastics are likely to remain in the nozzle, mixing chamber and second flow channel, and leakage is likely to occur under the vertical gravity. Moreover, the plastic finished products have a single color pattern and do not have an adjustment function, making it difficult to meet different usage requirements. Summary of the Invention

[0004] The purpose of the invention is to provide a leak-proof nozzle for a two-color injection molding machine, aiming to solve the problems existing in the above background art.

[0005] The invention is realized as follows. A leak-proof nozzle for a two-color injection molding machine includes a nozzle body, and further includes:

[0006] A flow channel, which is arranged in the nozzle body, is divided into multiple segments, and adjacent segments are in a communicating state;

[0007] An end closing mechanism, which is arranged in the diversion flow channel in the flow channel, is used to control the movement trajectory of the liquid in the flow channel and prevent its backflow;

[0008] An anti-backflow mechanism, which is arranged in the discharge flow channel in the flow channel to facilitate the flow limiting of the mixing of two liquids;

[0009] An elastic adjustment mechanism, which is provided with multiple groups at the discharge flow channel in the nozzle body, is arranged at equal angles, and the moving speed of the elastic adjustment mechanism automatically changes with the liquid flow rate;

[0010] A quick intercepting mechanism, which is arranged at the end of the nozzle body, is connected to the cross bar in the elastic adjustment mechanism, and is used to complete the intercepting work of the liquid through the set quick intercepting mechanism when the liquid passes through the elastic adjustment mechanism;

[0011] Wherein, a flow control plate is installed at the connection between the flow direction changing channel and the discharge channel, and a plurality of stirring frames are arranged on the side surface of the flow control plate in the discharge channel, so as to facilitate the mixing of the liquid flowing at a high speed.

[0012] Preferably, the channel includes a feed channel, a flow direction changing channel, a discharge channel and a connecting channel;

[0013] The feed channel, the flow direction changing channel and the discharge channel are sequentially arranged in the nozzle body, and the adjacent feed channel and the flow direction changing channel are communicated, and the flow direction changing channel and the discharge channel are communicated;

[0014] The feed channel and the flow direction changing channel are symmetrically arranged in the nozzle body, and the segmented discharge channels are communicated through the connecting channel.

[0015] Preferably, the end closing mechanism includes a gradual change part, a sphere and a limiting protrusion;

[0016] The gradual change part is arranged at the connection between the flow direction changing channel and the feed channel, and the limiting protrusion is fixedly installed inside the flow direction changing channel;

[0017] The sphere is arranged in the flow direction changing channel and is in different flow states when the sphere contacts the gradual change part or the limiting protrusion respectively.

[0018] Preferably, the anti-backflow mechanism includes a positioning post one, an elastic sleeve plate, an anti-leakage groove, a positioning post two, an elastic member one and a baffle one;

[0019] The positioning post one and the positioning post two are fixedly installed inside the discharge channel. Among them, the elastic sleeve plate is movably installed on the positioning post two, and the elastic sleeve plate is located on the side surface of the positioning post one;

[0020] One end of the elastic sleeve plate is slidably connected with the anti-leakage groove opened in the nozzle body, and the other end of the elastic sleeve plate swings in the top area of the connecting channel;

[0021] An elastic member one and a baffle one are further installed on the side surface of the elastic sleeve plate, and both the elastic member one and the baffle one are connected with the inner wall of the discharge channel.

[0022] Preferably, the baffle one is made of a rubber material, so as to be deformed when the elastic sleeve plate swings and prevent the liquid from flowing into the internal area surrounded by the nozzle body, the elastic sleeve plate and the baffle one.

[0023] Preferably, the elastic adjusting mechanism includes a movable rod, a movable plate, a chamber, a plastic sealing block, a cross bar, a baffle two and an elastic member two;

[0024] The movable rod is hinged in the nozzle body, a movable plate is installed at the end of the movable rod in the discharge channel, and plastic sealing blocks are arranged on both sides of the movable rod;

[0025] The cross bar is slidably installed in the nozzle body. A second baffle is fixedly installed on the cross bar. The second baffle abuts against the movable rod, and a second elastic member is also arranged on the side surface of the second baffle.

[0026] A chamber for the movement of the movable rod and the cross bar is formed in the nozzle body.

[0027] Preferably, the quick shut-off mechanism includes a connecting rod, a shut-off plate, a connecting plate and a guide rod.

[0028] A plurality of shut-off plates are provided and are evenly distributed on the side of the discharge flow channel. A connecting plate is installed between adjacent shut-off plates. The connecting plate is made of an elastic material to facilitate deformation when the shut-off plate moves.

[0029] Wherein, a guide rod is installed on the outer side of each shut-off plate to control the movement track of the shut-off plate; a connecting rod is also installed on the side surface of each shut-off plate. The connecting rod is hinged to the free end of the cross bar to drive the connecting rod and the shut-off plate to move synchronously when the cross bar moves, so as to realize the quick opening and closing of adjacent shut-off plates.

[0030] The technical effect of the anti-leakage nozzle for a two-color injection molding machine provided by the present invention has the characteristics of multiple anti-backflow and fast response speed. It can independently control the flow of two liquids before and after contact, making the nozzle more controllable and safer during operation. At the same time, it can realize the quick shut-off of the liquid at the end, effectively avoiding the outflow of the liquid remaining at the end of the nozzle. Moreover, it uses the thrust of the injection liquid itself to simply stir it, and when the thrust changes, the color pattern of the finished product can be made more abundant to meet different usage requirements. Description of the Drawings

[0031] Figure 1 It is a schematic structural diagram of an anti-leakage nozzle for a two-color injection molding machine provided by the present invention;

[0032] Figure 2 For Figure 1 The partial enlarged view at A in

[0033] Figure 3 For Figure 1 The partial enlarged view at B in

[0034] Figure 4 It is a transmission diagram of the shut-off plate in an anti-leakage nozzle for a two-color injection molding machine provided by the present invention;

[0035] Figure 5 It is a schematic structural diagram of the quick shut-off mechanism in an anti-leakage nozzle for a two-color injection molding machine provided by the present invention;

[0036] Figure 6 It is a closed state diagram of the shut-off plate in an anti-leakage nozzle for a two-color injection molding machine provided by the present invention;

[0037] In the drawings: 1 - nozzle body; 2 - feed channel; 3 - diversion channel; 4 - discharge channel; 5 - connecting channel; 6 - gradual change part; 7 - sphere; 8 - limiting protrusion; 9 - flow control plate; 10 - stirring rack; 11 - interface; 12 - positioning post 1; 13 - elastic sleeve plate; 14 - leak-proof groove; 15 - positioning post 2; 16 - elastic member 1; 17 - baffle plate 1; 18 - movable rod; 19 - movable plate; 20 - chamber; 21 - plastic sealing block; 22 - cross bar; 23 - baffle plate 2; 24 - elastic member 2; 25 - connecting rod; 26 - intercepting plate; 27 - connecting plate; 28 - guide rod; 100 - end closing mechanism; 200 - anti-backflow mechanism; 300 - elastic adjustment mechanism; 400 - quick intercepting mechanism. Detailed implementation mode

[0038] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] The following describes in detail the specific implementation of the present invention with reference to specific embodiments.

[0040] As Figures 1 to 6 shown, it is a structural diagram of a leak-proof nozzle for a two-color injection molding machine provided by the present invention, including a nozzle body 1, a flow channel, an end closing mechanism 100, an anti-backflow mechanism 200, an elastic adjustment mechanism 300 and a quick intercepting mechanism 400. The flow channel is arranged in the nozzle body 1. The flow channel is divided into multiple sections, and adjacent sections are in a connected state. The end closing mechanism 100 is arranged in the diversion channel 3 in the flow channel to control the movement trajectory of the liquid in the flow channel and prevent it from flowing back. The anti-backflow mechanism 200 is arranged in the discharge channel 4 in the flow channel to facilitate the flow limiting of the mixing of two liquids. Multiple groups of elastic adjustment mechanisms 300 are arranged at the position of the discharge channel 4 in the nozzle body 1. The elastic adjustment mechanisms 300 are arranged at equal angles, and the moving speed of the elastic adjustment mechanisms 300 automatically changes with the liquid flow rate. The quick intercepting mechanism 400 is arranged at the end of the nozzle body 1. The quick intercepting mechanism 400 is connected to the cross bar 22 in the elastic adjustment mechanism 300 to complete the intercepting work of the liquid through the provided quick intercepting mechanism 400 when the liquid passes through the elastic adjustment mechanism 300. Among them, a flow control plate 9 is installed at the connection of the diversion channel 3 and the discharge channel 4. Multiple stirring racks 10 are arranged on the side of the flow control plate 9 in the discharge channel 4 to facilitate the mixing of the liquid under high-speed flow.

[0041] In an example of the present invention, interfaces 11 are installed at positions corresponding to the two feed channels 2 on the nozzle body 1. The interfaces 11 can be threaded interfaces to facilitate quick connection during infusion. In addition, the stirring frame 10 can be driven by liquid simultaneously, and can also be driven by arranging gears at the end of the stirring frame 10 outside the nozzle body 1, so as to facilitate the same-direction or reverse rotation of adjacent stirring frames 10, thereby facilitating the rapid stirring of the two liquids. When necessary, an external insertion rod can be inserted at the tooth root of the gear to block the rotation of the stirring frame 10 by the liquid thrust, so as to achieve the purpose of adjusting the two colors on the injection molded product.

[0042] As Figure 1 shown, as a preferred embodiment of the present invention, the flow channel includes a feed channel 2, a diversion channel 3, a discharge channel 4, and a connection channel 5;

[0043] The feed channel 2, the diversion channel 3, and the discharge channel 4 are arranged in sequence in the nozzle body 1, and the adjacent feed channel 2 and diversion channel 3 are connected, and the diversion channel 3 and the discharge channel 4 are connected;

[0044] The feed channel 2 and the diversion channel 3 are symmetrically arranged in the nozzle body 1, and the segmented discharge channel 4 is connected through the connection channel 5.

[0045] In an example of the present invention, when the interfaces 11 are respectively connected to external liquid injection tubes, the injection molding liquids flow into the nozzle body 1 along the feed channels 2 respectively, and the pressure needs to be ensured to be consistent. The liquids converge when passing through the end of the diversion channel 3, and enter one side of the discharge channel 4 through the flow control plate 9, and finally are extruded from the end of the other side of the discharge channel 4 through the connection channel 5 out of the nozzle body 1.

[0046] As Figure 1 shown, as another preferred embodiment of the present invention, the end closing mechanism 100 includes a gradual change part 6, a sphere 7, and a limit protrusion 8;

[0047] The gradual change part 6 is arranged at the connection of the diversion channel 3 and the feed channel 2, and the limit protrusion 8 is fixedly installed inside the diversion channel 3;

[0048] The sphere 7 is arranged in the diversion channel 3. The diameter of the sphere 7 is smaller than the inner diameter of the diversion channel 3, and it is in different flow states when the sphere 7 contacts the gradual change part 6 or the limit protrusion 8 respectively.

[0049] In an example of the present invention, in the accompanying drawings of the specification Figure 1Taking [a certain reference], when the liquid moves from the left side to the right side, the sphere 7 flows along the diversion channel 3 under the push of the liquid, and stops moving when the sphere 7 reaches the limit projection 8. The liquid flows along the gap of the limit projection 8. When the liquid has a reverse flow, the liquid pushes the sphere 7 to move to the left side, and the sphere 7 stays in the gradual change part 6 to seal it, thereby avoiding the reverse flow of the liquid.

[0050] As Figure 1 and Figure 2 shown, as another preferred embodiment of the present invention, the anti-backflow mechanism 200 includes a positioning post one 12, an elastic sleeve plate 13, an anti-leakage groove 14, a positioning post two 15, an elastic member one 16 and a baffle one 17;

[0051] The positioning post one 12 and the positioning post two 15 are fixedly installed inside the discharge channel 4. Among them, an elastic sleeve plate 13 is movably installed on the positioning post two 15, and the elastic sleeve plate 13 is located on the side of the positioning post one 12;

[0052] One end of the elastic sleeve plate 13 is slidably connected to the anti-leakage groove 14 opened in the nozzle body 1, and the other end of the elastic sleeve plate 13 swings within the top area of the connection channel 5;

[0053] An elastic member one 16 and a baffle one 17 are further installed on the side surface of the elastic sleeve plate 13, and both the elastic member one 16 and the baffle one 17 are connected to the inner wall of the discharge channel 4.

[0054] In an example of the present invention, the baffle one 17 is made of rubber material, so as to be deformed when the elastic sleeve plate 13 swings, and avoid the liquid from flowing into the internal area surrounded by the nozzle body 1, the elastic sleeve plate 13 and the baffle one 17.

[0055] When the liquid passes through the elastic sleeve plate 13, it pushes the elastic sleeve plate 13 to swing counterclockwise in a plane along the positioning post two 15. The end of the elastic sleeve plate 13 slides along the anti-leakage groove 14. The elastic member one 16 is elastically deformed under force, and the baffle one 17 is bent. The liquid flows from the discharge channel 4 into the connection channel 5 along the surface of the elastic sleeve plate 13. If the liquid has a reverse flow, the liquid pushes the elastic sleeve plate 13 to swing clockwise in a plane. When the elastic sleeve plate 13 contacts the positioning post one 12, the elastic sleeve plate 13 is in a vertical state, and the bottom end of the elastic sleeve plate 13 abuts against the corner of the discharge channel 4 and the connection channel 5, thereby completing the blocking work of the discharge channel 4 and the connection channel 5.

[0056] As Figure 1 、 Figure 3 and Figure 4 shown, as another preferred embodiment of the present invention, the elastic adjustment mechanism 300 includes a movable rod 18, a movable plate 19, a chamber 20, a plastic sealing block 21, a cross bar 22, a baffle two 23 and an elastic member two 24;

[0057] The movable rod 18 is hinged inside the nozzle body 1. A movable plate 19 is installed at the end of the movable rod 18 within the discharge channel 4. Plastic sealing blocks 21 are arranged on both sides of the movable rod 18.

[0058] The cross bar 22 is slidably installed inside the nozzle body 1. A second baffle 23 is fixedly installed on the cross bar 22. The second baffle 23 abuts against the movable rod 18. An elastic member two 24 is also arranged on the side of the second baffle 23.

[0059] A chamber 20 for the movement of the movable rod 18 and the cross bar 22 is formed inside the nozzle body 1.

[0060] In an example of the present invention, when the liquid flows, it pushes the movable plate 19 and the movable rod 18 to rotate along the nozzle body 1. The plastic sealing blocks 21 on both sides are deformed to prevent the liquid from entering the chamber 20. When the movable rod 18 rotates, it also pushes the second baffle 23 and the cross bar 22 to move synchronously. The elastic member two 24 is deformed under force, and the greater the liquid flow rate, the greater the distance the cross bar 22 moves to the left.

[0061] As Figure 1 、 Figure 4 、 Figure 5 and Figure 6 shown, as another preferred embodiment of the present invention, the quick shut-off mechanism 400 includes a connecting rod 25, a shut-off plate 26, a connecting plate 27 and a guide rod 28;

[0062] A plurality of shut-off plates 26 are provided and are evenly distributed on the side of the discharge channel 4. A connecting plate 27 is installed between adjacent shut-off plates 26. The connecting plate 27 is made of an elastic material to facilitate deformation when the shut-off plate 26 moves.

[0063] Wherein, a guide rod 28 is installed on the outer side of each shut-off plate 26 to control the movement track of the shut-off plate 26; a connecting rod 25 is also installed on the side of each shut-off plate 26. The connecting rod 25 is hinged to the free end of the cross bar 22 to facilitate driving the connecting rod 25 and the shut-off plate 26 to move synchronously when the cross bar 22 moves, so as to realize the quick opening and closing of adjacent shut-off plates 26.

[0064] In an example of the present invention, with reference to the accompanying drawings of the specification Figure 4 and Figure 5 as a reference, when the cross bar 22 slides to the left, the cross bar 22 pulls the connecting rod 25 to swing in a plane. The connecting rod 25 pulls the corresponding shut-off plate 26 and the guide rod 28 to move outward. The greater the flow rate, the greater the distance between adjacent shut-off plates 26, and the larger the channel formed by the shut-off plate 26 and the connecting plate 27. When the liquid flow rate decreases at the end of injection molding, it can quickly push a plurality of shut-off plates 26 closer, so that the channel is as shown in the accompanying drawings of the specificationFigure 6 The rapid closing shown avoids the situation of liquid leakage from the nozzle tip.

[0065] In summary, when the interface 11 is respectively connected to the external liquid injection pipe, the injection liquid flows into the nozzle body 1 along the feeding flow channel 2 respectively. When the liquid moves from the left side to the right side, the sphere 7 flows along the diversion flow channel 3 under the push of the liquid, and stops moving when the sphere 7 reaches the limit protrusion 8. The liquid flows along the gap of the limit protrusion 8. The liquid converges when passing through the end of the diversion flow channel 3, and enters the discharge flow channel 4 on one side through the flow control plate 9, and finally is extruded from the end of the discharge flow channel 4 on the other side through the connection flow channel 5 out of the nozzle body 1. When the liquid flows, it pushes the movable plate 19 and the movable rod 18 to rotate along the nozzle body 1, and the plastic sealing blocks 21 on both sides are deformed to prevent the liquid from entering the chamber 20. When the movable rod 18 rotates, it also pushes the baffle two 23 and the cross bar 22 to move synchronously. The elastic member two 24 is deformed under force. When the cross bar 22 slides to the left, the cross bar 22 pulls the connecting rod 25 to swing in a plane. The connecting rod 25 pulls the corresponding intercepting plate 26 and the guide rod 28 to move outward, and the greater the flow rate, the greater the distance between adjacent intercepting plates 26. The channel formed by the intercepting plate 26 and the connecting plate 27 is larger to ensure the smooth outward export of the liquid. When the liquid flows backward, on the one hand, the liquid pushes the sphere 7 to move to the left, and the sphere 7 stays in the gradual change part 6 to seal it, thus avoiding the reverse flow of the liquid. On the other hand, the liquid pushes the elastic sleeve plate 13 to swing clockwise in a plane. When the elastic sleeve plate 13 contacts the positioning column one 12, the elastic sleeve plate 13 is in a vertical state, and the bottom end of the elastic sleeve plate 13 abuts against the corner of the discharge flow channel 4 and the connection flow channel 5, thus completing the blocking work of the discharge flow channel 4 and the connection flow channel 5. After the injection molding is completed and the liquid flow rate decreases, the elastic member two 24 returns to its original state and sequentially pushes the baffle two 23, the cross bar 22, the connecting rod 25 and the intercepting plate 26 to move. The intercepting plates 26 at multiple positions quickly approach, making the channel Figure 6 shown close rapidly, avoiding the situation of liquid leakage at the nozzle end; this nozzle has multiple anti-backflow functions, can independently control the flow of the two liquids before and after they come into contact, making the nozzle more controllable and safer during operation. At the same time, it can achieve rapid interception of the liquid at the end, effectively avoiding the liquid remaining at the nozzle end from flowing outwards, and using the thrust of the injection liquid itself to simply stir it, which can make the finished product color pattern more diverse to meet different usage requirements.

[0066] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention.

[0067] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A leak-proof nozzle for a two-color injection molding machine, comprising a nozzle body, characterized in that, It also includes: A runner, which is arranged inside the nozzle body. The runner is divided into multiple segments, and adjacent segments are in a connected state; An end closing mechanism, which is arranged in the diversion runner of the runner, used to control the movement trajectory of the liquid in the runner and prevent backflow; An anti-backflow mechanism, which is arranged in the discharge runner of the runner to facilitate current limiting for the mixing of two liquids; An elastic adjustment mechanism, which is provided with multiple groups at the discharge runner inside the nozzle body. The elastic adjustment mechanisms are arranged at equal angles, and the moving speed of the elastic adjustment mechanism automatically changes with the liquid flow rate; A quick interception mechanism, which is arranged at the end of the nozzle body. The quick interception mechanism is connected to the cross bar in the elastic adjustment mechanism, and is used to complete the interception of the liquid through the provided quick interception mechanism when the liquid passes through the elastic adjustment mechanism; Wherein, a flow control plate is installed at the connection of the diversion runner and the discharge runner, and multiple stirring frames are arranged on the side of the flow control plate in the discharge runner to facilitate the mixing of the liquid under high-speed flow; The runner includes a feed runner, a diversion runner, a discharge runner and a connecting runner; The feed runner, the diversion runner and the discharge runner are arranged in sequence inside the nozzle body, and the adjacent feed runner and diversion runner are connected, and the diversion runner and the discharge runner are connected; The feed runner and the diversion runner are symmetrically arranged inside the nozzle body, and the segmented discharge runner is connected through the connecting runner; The end closing mechanism includes a gradual change part, a sphere and a limit protrusion; The gradual change part is arranged at the connection of the diversion runner and the feed runner inside the diversion runner, and the limit protrusion is fixedly installed inside the diversion runner; The sphere is arranged in the diversion runner and is in different flow states when the sphere contacts the gradual change part or the limit protrusion respectively; The anti-backflow mechanism includes a positioning post one, an elastic sleeve plate, an anti-leakage groove, a positioning post two, an elastic member one and a baffle one; The positioning post one and the positioning post two are fixedly installed inside the discharge runner. Among them, the elastic sleeve plate is movably installed on the positioning post two, and the elastic sleeve plate is located on the side of the positioning post one; One end of the elastic sleeve plate is slidably connected to the anti-leakage groove opened inside the nozzle body, and the other end of the elastic sleeve plate swings in the top area of the connecting runner; An elastic member one and a baffle one are also installed on the side of the elastic sleeve plate, and both the elastic member one and the baffle one are connected to the inner wall of the discharge runner.

2. The leak-proof nozzle for a two-color injection molding machine according to claim 1, characterized in that, The baffle one is made of rubber material, so as to deform when the elastic sleeve plate swings, and prevent the liquid from flowing into the internal area surrounded by the nozzle body, the elastic sleeve plate and the baffle one.

3. The leak-proof nozzle for a two-color injection molding machine according to claim 1, characterized in that, The elastic adjustment mechanism includes a movable rod, a movable plate, a chamber, a plastic sealing block, a cross bar, a baffle two and an elastic member two; The movable rod is hinged inside the nozzle body, and a movable plate is installed at the end of the movable rod inside the discharge runner, and plastic sealing blocks are arranged on both sides of the movable rod; The cross bar is slidably installed inside the nozzle body, and a baffle two is fixedly installed on the cross bar. The baffle two abuts against the movable rod, and an elastic member two is also arranged on the side of the baffle two; A chamber for the movement of the movable rod and the cross bar is opened inside the nozzle body.

4. A leak-proof nozzle for a two-color injection molding machine according to claim 1, characterized in that, The quick interception mechanism includes a connecting rod, an interception plate, a connecting plate and a guide rod; A plurality of the intercepting plates are provided and are evenly distributed on the side of the discharge channel, and a connecting plate is installed between adjacent intercepting plates. The connecting plate is made of an elastic material to facilitate deformation when the intercepting plates move; Wherein, a guide rod is installed on the outer side of each intercepting plate to control the movement track of the intercepting plate; a connecting rod is also installed on the side of each intercepting plate, and the connecting rod is hinged to the free end of the cross bar, so as to drive the connecting rod and the intercepting plate to move synchronously when the cross bar moves, realizing the rapid opening and closing of adjacent intercepting plates.

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