A three-way valve structure for injection molding machine

Abstract

The present invention belongs to the field of injection molding machines, and provides a three-way valve structure for injection molding machines, including: a valve body, which is longitudinally provided with a mounting hole and a flow hole, the mounting hole is communicated with the flow hole, the lower part of the valve body is transversely provided with a feed hole and a discharge hole, the feed hole is communicated with the mounting hole; a valve core, which is longitudinally movably arranged in the mounting hole, the lower end of the valve core is movably inserted in the discharge hole and separates the discharge hole and the feed hole, when feeding into the feed hole, the raw material can drive the valve core to move upward; when the valve core moves upward, the lower end of the valve core is separated from the discharge hole, the feed hole and the discharge hole are communicated, and the flow hole and the mounting hole are separated by the upper end of the valve core. Compared with the prior art, the advantages of the present invention are: the up and down movement of the valve body is driven only by the flow of raw materials, no additional driving source needs to be installed, the structure is simple, the manufacturing cost, and the difficulty of repair and maintenance during use is low.

Description

Technical Field

[0001] The invention belongs to the field of injection molding machines, and in particular relates to a three-way valve structure used for injection molding machines. Background Art

[0002] Injection molding equipment, also known as injection molding machine or injection machine, is the main molding equipment that uses plastic molding molds to make plastic products of various shapes from thermoplastics or thermosetting plastics. Injection molding machines have a wide range of uses.

[0003] For example, a three-way valve and a pre-plastic injection device using the three-way valve with the authorization announcement number CN209067878U include a valve body; a mounting hole, which is transversely penetrated on the valve body; a first through hole, which axially penetrates the valve body and the mounting hole and communicates with the first through hole; a first connecting hole, which is vertically arranged on the valve body and located above the mounting hole, and the first connecting hole communicates with the mounting hole and the outside of the valve body; a valve core, which is transversely arranged in the mounting hole and movably connected to the valve body; a second through hole, which is transversely penetrated on the valve core and communicated with the first connecting hole; a second connecting hole, which is arranged on the valve core and communicates with the second through hole and the first through hole; when the valve core rotates to a preset position in the valve body, the second through hole is staggered with the first connecting hole and the second connecting hole is staggered with the first through hole, and the first through hole is communicated with the second through hole. Although it can realize the functions of material storage and injection, the three-way valve structure adopted by it is relatively complicated, and the rotation of the valve core also requires an additional driving source to provide power, which not only increases the manufacturing cost, but also increases the difficulty of repair and maintenance during use. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a three-way valve structure for an injection molding machine in view of the current status of the prior art.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: a three-way valve structure for an injection molding machine is proposed, comprising: a valve body, which is longitudinally provided with a mounting hole and a flow hole, the mounting hole is communicated with the flow hole, and a feed hole and a discharge hole are transversely provided at the lower part of the valve body, the feed hole is communicated with the mounting hole;

[0006] A sol cylinder connected to the upper end of the valve body and communicating with the flow hole;

[0007] A glue injection cylinder connected to the lower end of the valve body and communicated with the feed hole;

[0008] A rubber injection cylinder connected to the lower end of the valve body and communicated with the discharge hole;

[0009] A valve core is longitudinally movably arranged in the mounting hole, and the lower end of the valve core is movably inserted in the discharge hole and separates the discharge hole from the feed hole. When the injection cylinder feeds material into the feed hole, the raw material can drive the valve core to move upward;

[0010] When the valve core moves upward, the lower end of the valve core is separated from the discharge hole, the feed hole and the discharge hole are connected, and the flow hole and the mounting hole are separated by the upper end of the valve core.

[0011] In the above-mentioned three-way valve structure for an injection molding machine, a stop block is provided on one side of the valve core, and a stop ball is provided on the upper end of the valve core, and the stop block is movably inserted into the discharge hole; when the valve core moves upward, the top end of the stop ball is inserted into the lower end of the flow hole, and the stop block is separated from the discharge hole.

[0012] In the above-mentioned three-way valve structure for an injection molding machine, an inclined abutment surface is provided at the lower end of the valve core, and the inclined abutment surface is located in the feed hole.

[0013] In the above-mentioned three-way valve structure for an injection molding machine, an annular downward pressure surface is provided on the valve core, and the annular downward pressure surface is located in the mounting hole.

[0014] In the above-mentioned three-way valve structure for an injection molding machine, the maximum diameter of the stop ball is greater than the diameter of the flow hole.

[0015] In the above-mentioned three-way valve structure for an injection molding machine, a mounting seat is inserted into the lower end of the valve body, a connecting column is arranged on the mounting seat, the connecting column passes through the feed hole and the discharge hole and extends into the mounting hole, and the valve core is movably sleeved on the connecting column.

[0016] In the above-mentioned three-way valve structure for an injection molding machine, the diameter of the feed hole and the diameter of the discharge hole are both larger than the diameter of the connecting column.

[0017] In the above-mentioned three-way valve structure for an injection molding machine, a first stop surface is arranged on the side of the connecting column, a movable hole is opened on the valve body, a second stop surface is arranged in the movable hole, the connecting column is movably inserted in the movable hole and the first stop surface movably abuts against the second stop surface.

[0018] Compared with the prior art, the advantage of the present invention is that in the three-way valve structure used for the injection molding machine, the valve body moves up and down to realize the connection or closing between the feed hole and the discharge hole, the flow hole and the mounting hole. The up and down movement of the valve body is driven only by the flow of raw materials, and there is no need to install an additional driving source. The structure is simple, the manufacturing cost is low, and the difficulty of repair and maintenance during use is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a cross-sectional view of the three-way valve structure used in the injection molding machine during the material storage process;

[0020] Figure 2 This is a cross-sectional view of the three-way valve structure used in the injection molding machine during the injection process;

[0021] Figure 3 It is the front view of the valve core;

[0022] Figure 4 It is a side view of the valve core;

[0023] Figure 5 It is a cross-sectional view of the valve core;

[0024] Figure 6 is a top view of the mount.

[0025] In the figure, valve body 1, mounting hole 2, flow hole 3, feed hole 4, discharge hole 5, sol tube 6, glue injection tube 7, glue shooting tube 8, valve core 9, stop block 10, stop ball 11, inclined abutment surface 12, annular downward pressure surface 13, mounting seat 14, connecting column 15, first stop surface 16, second stop surface 17, and moving hole 18. DETAILED DESCRIPTION

[0026] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0027] like Figures 1 to 6 As shown, the three-way valve structure for injection molding machine comprises: a valve body 1, which is longitudinally provided with a mounting hole 2 and a flow hole 3, the mounting hole 2 is communicated with the flow hole 3, a feed hole 4 and a discharge hole 5 are transversely provided at the lower part of the valve body 1, the feed hole 4 is communicated with the mounting hole 2; a sol cylinder 6, which is connected to the valve body 1 and communicated with the flow hole 3; a glue injection cylinder 7, which is connected to the valve body 1 and communicated with the feed hole 4; a glue injection cylinder 8, which is connected to the valve body 1 and communicated with the discharge hole 5; a valve core 9, which is longitudinally movably arranged at In the mounting hole 2, when the sol tube 6 feeds into the circulation hole 3, the raw material can drive the valve core 9 to move downward, and when the injection tube 7 feeds into the feed hole 4, the raw material can drive the valve core 9 to move upward; when the valve core 9 moves downward, the circulation hole 3, the mounting hole 2 and the feed hole 4 are connected, and the feed hole 4 and the discharge hole 5 are separated by the lower end of the valve core 9; when the valve core 9 moves upward, the lower end of the valve core 9 is separated from the discharge hole 5, the feed hole 4 and the discharge hole 5 are connected, and the circulation hole 3 and the mounting hole 2 are separated by the upper end of the valve core 9.

[0028] The sol cylinder 6 is used to melt the raw material. After the raw material is melted, the sol cylinder 6 squeezes the raw material into the circulation hole 3. The circulation hole 3 is connected with the mounting hole 2, so the raw material can enter the mounting hole 2 through the circulation hole 3. Because the valve core 9 is movably arranged in the mounting hole 2, when the raw material enters the mounting hole 2, it can contact the valve core 9, and then the downward pressure of the raw material can drive the valve core 9 to move downward. When the valve core 9 moves downward to the preset position, the circulation hole 3, the mounting hole 2 and the feed hole 4 are connected. The feed hole 4 and the discharge hole 5 are separated by the lower end of the valve core 9, and then the raw material can enter the mounting hole 2 through the circulation hole 3, and then flow from the mounting hole 2 to the feed hole 4. Because the glue injection cylinder 7 is connected with the feed hole 4, the raw material can finally flow into the glue injection cylinder 7 without entering the glue injection cylinder 8, thereby achieving the purpose of material storage.

[0029] When the injection cylinder 7 is full of raw materials, injection molding begins, that is, the injection cylinder 7 transports the raw materials to the shot cylinder 8, and the injection cylinder 7 is connected with the feed hole 4. When the injection cylinder 7 discharges the material, the raw material enters the feed hole 4 and contacts the valve core 9. Because the injection cylinder 7 and the feed hole 4 are both arranged at the lower end of the valve body 1, the raw material can give the valve core 9 an upward direction when contacting with the valve core 9, and then the raw material can drive the valve core 9 to move upward, and then the upper end of the valve core 9 can be inserted into the flow hole 3 and separate the flow hole 3 from the mounting hole 2. At this time, the lower end of the valve core 9 is separated from the discharge hole 5, and the feed hole 4 and the discharge hole 5 are connected, and then the raw material can enter the discharge hole 5 through the feed hole 4, and finally the raw material enters the shot cylinder 8, achieving the purpose of ejecting material during injection molding.

[0030] During the entire process of material storage and injection, the up and down movement of the valve core 9 only relies on the extrusion force of the raw materials as a driving source. There is no need to add additional devices to the equipment to drive the valve core 9, which reduces manufacturing costs and reduces the difficulty of repair and maintenance during use. In addition, during the switching process between material storage and injection, the up and down movement of the valve core 9 has high reaction efficiency and will not be affected by other structures, thereby improving the switching speed of the material storage and injection processes.

[0031] A stop block 10 is provided on one side of the valve core 9, and a stop ball 11 is provided on the upper end of the valve core 9. The stop block 10 is movably inserted into the discharge hole 5; when the valve core 9 moves upward, the top end of the stop ball 11 is inserted into the lower end of the flow hole 3, and the stop block 10 is separated from the discharge hole 5.

[0032] When the valve core 9 moves upward, the top end of the stop ball 11 can be inserted into the lower end of the flow hole 3, thereby closing the flow hole 3, so that the flow hole 3 and the mounting hole 2 are separated, and the stop block 10 is separated from the discharge hole 5, thereby enabling the discharge hole 5 to communicate with the feed hole 4.

[0033] The maximum diameter of the stop ball 11 is larger than the diameter of the circulation hole 3 , on the one hand to prevent the stop ball 11 from completely entering the circulation hole 3 to ensure smooth up and down movement of the valve core 9 , and secondly to ensure that the circulation hole 3 and the mounting hole 2 can be completely isolated.

[0034] An inclined abutment surface 12 is provided at the lower end of the valve core 9, and the inclined abutment surface 12 is located in the feed hole 4. When injecting, the raw material enters the feed hole 4 and contacts the inclined abutment surface 12. The forward extrusion force of the raw material acts on the inclined abutment surface 12, and then the forward extrusion force of the raw material can drive the valve core 9 to move upward, so that the lower end of the valve core 9 can be separated from the discharge hole 5. When the valve core 9 is separated from the discharge hole 5, the discharge hole 5 is connected with the feed hole 4, and then the raw material can enter the injection cylinder 8 through the discharge hole 5.

[0035] An annular downward pressure surface 13 is provided on the valve core 9, and the annular downward pressure surface 13 is located in the mounting hole 2. When storing materials, the raw material enters the circulation hole 3, thereby squeezing the top of the valve core 9 and driving the valve core 9 to move downward. After the valve core 9 moves downward until its top end is separated from the circulation hole 3, the raw material can enter the mounting hole 2, and then the raw material can contact the annular downward pressure surface 13. The downward extrusion force of the raw material acts on the annular downward pressure surface 13, and then the raw material can continue to drive the valve core 9 to move downward until the stop block 10 is fully inserted into the discharge hole 5. The advantage of setting the annular downward pressure surface 13 is to prevent the stop block 10 from being fully inserted into the discharge hole 5 due to insufficient extrusion force of the raw material on the top of the valve core 9.

[0036] A mounting seat 14 is inserted at the lower end of the valve body 1 , and a connecting column 15 is arranged on the mounting seat 14 . The connecting column 15 passes through the feed hole 4 and the discharge hole 5 and extends into the mounting hole 2 . The valve core 9 is movably sleeved on the connecting column 15 .

[0037] The mounting seat 14 is inserted into the lower end of the valve body 1 , and the valve core 9 is movably sleeved on the connecting column 15 , thereby ensuring that the valve core 9 can move up and down along a specified route.

[0038] The diameter of the feed hole 4 and the diameter of the discharge hole 5 are both larger than the diameter of the connecting column 15, ensuring that after the valve core 9 moves upward to the stop block 10 and disengages from the discharge hole 5, the feed hole 4 and the discharge hole 5 can be connected, and the raw material in the feed hole 4 can bypass the connecting column 15 and enter the discharge hole 5.

[0039] A first stop surface 16 is provided on the side of the connecting column 15, and a movable hole 18 is opened on the valve body 1, and a second stop surface 17 is provided in the movable hole 18. The connecting column 15 is movably inserted in the movable hole 18 and the first stop surface 16 movably abuts against the second stop surface 17, and the first stop surface 16 movably abuts against the second stop surface 17, so that the valve core 9 can be prevented from rotating during the up and down movement.

[0040] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways without departing from the scope defined by the spirit of the present invention.

Claims

1. A three-way valve structure for an injection molding machine, characterized in that: include: A valve body, which is provided with a mounting hole and a flow hole in the longitudinal direction, the mounting hole is communicated with the flow hole, and a feed hole and a discharge hole are provided in the transverse direction at the lower part of the valve body, the feed hole is communicated with the mounting hole; A valve core is longitudinally movably arranged in the mounting hole, and the lower end of the valve core is movably inserted in the discharge hole and separates the discharge hole from the feed hole. When feeding into the feed hole, the raw material can drive the valve core to move upward; When the valve core moves upward, the lower end of the valve core is separated from the discharge hole, the feed hole and the discharge hole are connected, and the flow hole and the mounting hole are separated by the upper end of the valve core; A stop block is provided on one side of the valve core, and a stop ball is provided on the upper end of the valve core, and the stop block is movably inserted into the discharge hole; when the valve core moves upward, the top end of the stop ball is inserted into the lower end of the flow hole, and the stop block is separated from the discharge hole; The lower end of the valve core is provided with an inclined abutment surface, and the inclined abutment surface is located in the feed hole.

2. A three-way valve structure for an injection molding machine according to claim 1, characterized in that: The valve core is provided with an annular downward pressure surface, and the annular downward pressure surface is located in the mounting hole.

3. A three-way valve structure for an injection molding machine according to claim 1, characterized in that: The maximum diameter of the stop ball is greater than the diameter of the flow hole.

4. A three-way valve structure for an injection molding machine according to claim 1, characterized in that: A mounting seat is inserted at the lower end of the valve body, a connecting column is arranged on the mounting seat, the connecting column passes through the feed hole and the discharge hole and extends into the mounting hole, and the valve core is movably sleeved on the connecting column.

5. A three-way valve structure for an injection molding machine according to claim 4, characterized in that: The diameter of the feed hole and the diameter of the discharge hole are both larger than the diameter of the connecting column.

6. A three-way valve structure for an injection molding machine according to claim 4, characterized in that: A first stop surface is arranged on the side of the connecting column, a movable hole is opened on the valve core, a second stop surface is arranged in the movable hole, the connecting column is movably inserted in the movable hole and the first stop surface movably abuts against the second stop surface.

7. A three-way valve structure for an injection molding machine according to claim 1, characterized in that: The upper end of the valve body is connected with a sol cylinder, which is communicated with the flow hole. The lower end of the valve body is provided with a glue injection cylinder and a glue shooting cylinder, which are communicated with the feed hole, and the glue shooting cylinder is communicated with the discharge hole.

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