A discharge structure of an injection mold

Abstract

The application provides a discharging structure of an injection mold, and belongs to the technical field of molds. The discharging structure solves the problem of low raw material utilization rate of the existing injection mold. The injection mold comprises a movable mold and a fixed mold, and a forming cavity is arranged between the movable mold and the fixed mold. A plurality of glue injection runners are arranged on the movable mold and used for injecting raw materials into the forming cavity. The discharging structure comprises a glue discharging runner arranged on the movable mold, a control valve assembly arranged on the movable mold, a detachable insert block fixedly connected to the movable mold, and a discharging groove located between the insert block and the fixed mold. The glue discharging runner penetrates through the insert block and is connected to the discharging groove. The insert block is provided with a water channel, and the water channel is arranged adjacent to the discharging groove. The control valve assembly controls the on-off of the glue discharging runner. The discharging structure of the injection mold has the advantage of improving the raw material utilization rate.

Description

Technical Field

[0001] The invention belongs to the technical field of molds and relates to a discharge structure of an injection mold. Background Art

[0002] Injection molds are machines that inject heated, molten raw materials into a mold cavity under high pressure, where they cool and solidify to create the final product. During injection molding, some of the raw materials remain at the extrusion port after a single injection. This portion of material deteriorates due to temperature and other factors. If this portion of material is injected directly into the mold cavity, the resulting product may yellow.

[0003] In response to the above problems, people have made various improvements, and some have even applied for patents. For example, Chinese patent literature discloses an injection molding discharge device on the safety pedal of an injection molding machine [application number: 201921383325.7; authorization announcement number: CN210940355U], which includes a machine base, a movable mold and a fixed mold are respectively provided on both sides of the machine base, and the mold protection assembly is provided with a protective plate in the vertical direction, and a receiving tray is provided directly below the protective plate. The machine base is provided with a track in the horizontal direction on the table surface, and a roller compatible with the track is provided on the bottom surface of the receiving tray. The receiving tray is slidably connected to the track on the surface of the machine base through the rollers on the bottom surface. The side surfaces on both sides of the receiving tray are respectively connected to the end faces of the belt, and the belt is transmitted horizontally on the surface of the machine base.

[0004] In this type of discharge device, when the injection molding machine is in the mold-opening state, the stepper motor pulls the receiving tray via a belt. The receiving tray moves back and forth on the track via rollers to the appropriate position. After the receiving tray stops, the injection molding machine starts discharging, and the discharged high-temperature waste falls into the receiving tray. After the discharge is qualified, the stepper motor again pulls the receiving tray via the belt, and the receiving tray moves on the track to the rear end of the injection molding machine. The receiving tray stops at the end of the track to cool. In this type of discharge device, the receiving tray is located directly below the protective plate. The high-temperature waste cleared by the hot runner falls into the receiving tray and is directly treated as scrap, reducing the utilization rate of raw materials. Summary of the Invention

[0005] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to propose a discharge structure for an injection mold, the technical problem to be solved is how to improve the utilization rate of raw materials.

[0006] The objectives of the present invention can be achieved through the following technical solutions: a discharge structure of an injection mold, the injection mold includes a movable mold and a fixed mold, a molding cavity is provided between the movable mold and the fixed mold, and the movable mold is provided with a plurality of injection channels for injecting raw materials into the molding cavity, characterized in that the discharge structure includes a discharge channel provided on the movable mold, a control valve assembly provided on the movable mold, a detachable insert fixed to the movable mold, and a discharge trough located between the insert and the fixed mold, the discharge channel passes through the insert and is connected to the discharge trough, the insert has a waterway channel, the waterway channel is arranged adjacent to the discharge trough, and the control valve assembly controls the on and off of the discharge channel.

[0007] After the mold is closed, the control valve assembly controls the unblocked discharge flow channel, and the injection molding machine injects the raw materials from the front section into the discharge trough through the discharge flow channel. The coolant in the water channel cools the surrounding area of ​​the discharge trough, allowing the raw materials in the discharge trough to quickly cool and solidify. Then the control valve assembly controls the discharge flow channel to be disconnected, and the injection molding machine injects qualified raw materials into the molding cavity through the injection flow channel. After the products in the molding cavity and the discharge trough are cooled and solidified, the mold is opened, and the cooled and solidified products in the molding cavity and the discharge trough are discharged. This discharge structure uses the discharge flow channel, inserts, and discharge trough to process products with relatively low raw material requirements that would otherwise be discarded. This avoids waste of raw materials and improves raw material utilization. In addition, the product shape is relatively small, and the inserts and discharge trough are also relatively small, without requiring significant changes to the structures of the movable and fixed molds. A water channel is provided in the insert to facilitate its molding, so that the raw materials in the discharge trough and the raw materials in the molding cavity can be cooled and solidified at the same time. The discharge trough can be partially located in the insert. By changing the insert, the shape of the discharge trough can be changed, and it can be used to process different products, thereby improving versatility. The discharge channel, insert, and discharge trough are all located inside the mold, so that the discharge structure does not occupy external space. At the same time, the control valve assembly accurately controls the on-off of the discharge channel, so that the raw materials flow in the set direction. Moreover, during this process, the injection molding machine performs continuous injection molding, which improves injection molding efficiency. The control valve assembly consists of a valve body, parts inside the valve body, an actuator that provides the driving force for valve operation, and various valve accessories. The specific structure will not be described in detail. The control valve assembly can accurately control the on-off and flow rate of the discharge channel.

[0008] In the aforementioned injection mold discharge structure, the fixed mold has a through-hole ejector channel. The top of the ejector channel extends through the bottom of the discharge trough, and the bottom of the ejector channel is connected to the outside world. An ejector rod is provided through the ejector channel for ejecting cooled and solidified items from the discharge trough. The ejector rod allows the cooled and solidified products in the discharge trough to be ejected during mold opening, facilitating material removal.

[0009] In the above-mentioned discharge structure of an injection mold, the bottom of the movable mold has a recessed mounting groove, the insert is detachably fixed in the mounting groove, the insert has a penetrating mounting hole, the control valve assembly includes a drive source and a nozzle for controlling the on-off of the discharge flow channel, the output shaft of the drive source is passed through the discharge flow channel, the nozzle is fixed in the mounting hole, the discharge flow channel is connected to the discharge trough through the nozzle, and the drive source drives the output shaft to extend into the nozzle to separate the discharge flow channel from the discharge trough. The insert is detachably installed, which facilitates the installation of the nozzle in the movable mold, so that the raw material can better flow to the discharge trough through the nozzle, so that the control valve assembly can control the on-off of the discharge flow channel, and the insert is replaceable. Replacing the insert can change the shape of the discharge trough and improve versatility.

[0010] In the aforementioned injection mold arrangement, the movable mold has several receiving slots for core blocks, with both ends of the mounting slots communicating with corresponding receiving slots. The core blocks are used to shape the molding cavity, facilitate machining of the mounting slots, and facilitate insertion and securement of the inserts.

[0011] In the aforementioned injection mold discharge structure, the mounting hole wall includes an annular step surface and a conical abutment surface, against which the nozzle abuts. This structure prevents the nozzle from shifting position when high-pressure jetting of material in the discharge channel occurs, thereby improving nozzle installation stability.

[0012] In the above-mentioned discharge structure of the injection mold, the diameter of the mounting hole at one end away from the discharge trough is larger than the diameter of the other end of the mounting hole, which makes the nozzle installation convenient and allows the raw materials in the discharge flow channel to enter the raw material trough better.

[0013] In the aforementioned discharge structure of an injection mold, the movable mold has a water inlet channel and a water outlet channel. The outer ends of the water inlet and outlet channels are both connected to the outside world, while the inner ends of the water inlet and outlet channels are respectively connected to the ends of the water channel. Cooling water enters the water channel through the water inlet channel, exchanges heat with the insert to cool the insert, and is then discharged through the water outlet channel. The provision of the water channel can accelerate the cooling and solidification of the product in the discharge trough, thereby improving injection molding efficiency.

[0014] In the aforementioned injection mold arrangement, the water channel is in a U-shaped configuration, and the mounting hole is located in the area surrounded by the water channel. This structure allows the water channel to be formed by drilling a hole in the side of the insert and then blocking the outer end, which facilitates processing. The location of the mounting hole makes efficient use of space and improves cooling performance.

[0015] In the aforementioned discharge structure of an injection mold, the top of the fixed mold has a protruding discharge protrusion, and the center of the top of the discharge protrusion is recessed to form the discharge trough. When the movable mold and the fixed mold are closed, the circumferential edge of the top of the discharge protrusion abuts against the insert. This structure can better shape the discharge trough, improve sealing, and prevent leakage from the discharge trough.

[0016] In the above-mentioned discharge structure of the injection mold, the circumferential edge of the top of the discharge protrusion is in the shape of a square ring, and the water channel is arranged along the circumferential edge of the top of the discharge protrusion, so as to reasonably utilize space and improve cooling effect.

[0017] Compared with the prior art, the discharge structure of the injection mold provided by the present invention has the following advantages:

[0018] 1. This discharge structure uses the discharge flow channel and the discharge trough to process the originally discarded raw materials into products with relatively low raw material requirements, which will not cause waste of raw materials, improve the utilization rate of raw materials and improve economic benefits. At the same time, the discharge trough can be made into different shapes to process different products.

[0019] 2. The discharge flow channel, discharge trough, control valve assembly and water channel of the discharge structure are all located inside the mold, so that the discharge structure does not occupy external space, making the space occupied by the entire injection mold small.

[0020] 3. The inserts of this discharge structure are detachably connected, and different inserts can be replaced according to actual needs to improve versatility; water channels are set in the inserts to better cool the inserts and the products in the discharge trough, so that the products in the discharge trough can be cooled and solidified faster, thereby improving the efficiency of the injection molding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional view of this arrangement structure.

[0022] Figure 2 This is an enlarged view of the arrangement structure.

[0023] Figure 3 This is a schematic diagram of the positional relationship between the glue injection runner, glue discharge runner, discharge chute and fixed mold.

[0024] Figure 4 This is an exploded view of the inserts and movable mold of this nesting structure.

[0025] Figure 5 It is a cross-sectional view of the insert of this arrangement structure.

[0026] In the figure, 1, movable mold; 2, fixed mold; 3, molding cavity; 4, glue injection channel; 5, glue discharge channel; 6, discharge trough; 7, control valve assembly; 71, driving source; 711, output shaft; 72, nozzle; 8, ejector channel; 9, ejector rod; 10, mounting groove; 11, insert; 12, mounting hole; 121, step surface; 122, abutting surface; 13, accommodating groove; 14, water channel; 15, water inlet channel; 16, water outlet channel; 17, discharge protrusion. DETAILED DESCRIPTION

[0027] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0028] like Figure 1 、 Figure 2 As shown, the injection mold includes a movable mold 1, a fixed mold 2, a discharge structure and a control valve assembly 7. There is a molding cavity 3 between the movable mold 1 and the fixed mold 2. The discharge structure includes a discharge flow channel 5, a discharge trough 6, an ejection channel 8, an ejector rod 9 and an insert 11. Figure 3 As shown, the control valve assembly 7 controls the opening and closing of the glue discharge channel 5 and all the glue injection channels 4 .

[0029] The movable mold 1 has a glue injection channel 4 for injecting raw materials into the molding cavity 3. The glue discharge channel 5 is provided on the movable mold 1 for injecting raw materials into the discharge trough 6. The control valve assembly 7 includes a driving source 71 and a nozzle 72 for controlling the on-off of the glue discharge channel 5. Figure 4 As shown, the movable mold 1 has a receiving groove 13 for accommodating core blocks. The bottom of the movable mold 1 has a recessed mounting groove 10, with both ends of the mounting groove 10 communicating with the corresponding receiving groove 13. An insert 11 is detachably fixed to the mounting groove 10 by bolts. The top of the fixed mold 2 has a protruding discharge protrusion 17, with a recessed center portion at the top of the discharge protrusion 17 forming a discharge groove 6. When the movable mold 1 and the fixed mold 2 are closed, the circumferential edge of the top of the discharge protrusion 17 abuts against the insert 11.

[0030] The insert 11 has a through-hole 12, the aperture of the mounting hole 12 at one end away from the discharge trough 6 being larger than the aperture of the other end of the mounting hole 12, the hole wall of the mounting hole 12 having an annular step surface 121 and a conical abutting surface 122, the nozzle 72 being fixedly connected to the mounting hole 12, the nozzle 72 abutting on the step surface 121 and the abutting surface 122. The output shaft 711 of the driving source 71 is provided in the discharge flow channel 5, and the discharge flow channel 5 is connected to the discharge trough 6 through the nozzle 72. The driving source 71 drives the output shaft 711 to extend into the nozzle 72 to separate the discharge flow channel 5 from the discharge trough 6. In this embodiment, the driving source 71 is a cylinder. In actual production, the driving source 71 can be a combination of a motor, a gear and a rack.

[0031] The insert 11 has a water channel 14, and the movable mold 1 has a water inlet channel 15 and a water outlet channel 16. Figure 5 As shown, the water channel 14 is in a ⌚ shape, the mounting hole 12 is located in the area surrounded by the water channel 14, and the circumferential edge of the top of the discharge protrusion 17 is square and ring-shaped. The water channel 14 is arranged along the circumferential edge of the top of the discharge protrusion 17. The outer ends of the water inlet channel 17 and the water outlet channel 16 are both connected to the outside world, and the inner ends of the water inlet channel 17 and the water outlet channel 16 are respectively connected to the two ends of the water channel 14.

[0032] The fixed mold 2 has an ejection channel 8 extending therethrough, the top of which passes through the bottom of the discharge trough 6, and the bottom of which is in communication with the outside world. An ejection rod 9 is provided in the ejection channel 8 for ejecting the cooled and solidified objects in the discharge trough 6.

[0033] After the mold is closed, the control valve assembly 7 controls all the glue injection channels 4 to be disconnected and the glue discharge channels 5 to be unblocked. The injection molding machine injects the raw materials from the front section into the discharge trough 6 through the glue discharge channels 5. Then the control valve assembly 7 controls the glue injection channels 4 to be unblocked and the glue discharge channels 5 to be disconnected. The injection molding machine injects qualified raw materials into the molding cavity 3 through the glue injection channels 4. After the products in the molding cavity 3 and the discharge trough 6 cool and solidify, the mold is opened and the cooled and solidified products in the molding cavity 3 and the discharge trough 6 are discharged. The above steps are then repeated to complete the processing of multiple products.

[0034] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

[0035] Although this document frequently uses terms such as movable mold 1, fixed mold 2, molding cavity 3, glue injection channel 4, glue discharge channel 5, discharge trough 6, control valve assembly 7, drive source 71, output shaft 711, nozzle 72, ejection channel 8, ejector rod 9, mounting groove 10, insert 11, mounting hole 12, stepped surface 121, abutting surface 122, receiving groove 13, water channel 14, water inlet channel 15, water outlet channel 16, and discharge protrusion 17, the use of other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A discharge structure of an injection mold, the injection mold comprising a movable mold (1) and a fixed mold (2), a molding cavity (3) being provided between the movable mold (1) and the fixed mold (2), a plurality of injection channels (4) for injecting raw materials into the molding cavity (3) being provided on the movable mold (1), characterized in that: The blanking structure includes a glue discharge runner (5) provided on the moving die (1), a control valve assembly (7) provided on the moving die (1), a insert block (11) detachably fixed on the moving die (1), and a blanking groove (6) located between the insert block (11) and the fixed die (2). The glue discharge runner (5) penetrates through the insert block (11) and is connected to the blanking groove (6). There is a water channel (14) in the insert block (11), and the water channel (14) is arranged adjacent to the blanking groove (6). The control valve assembly (7) controls the on / off of the glue discharge runner (5). There is a through ejecting channel (8) in the fixed die (2). The top of the ejecting channel (8) penetrates through the bottom of the blanking groove (6), and the bottom of the ejecting channel (8) is connected to the outside. An ejecting rod (9) for ejecting the cooled and solidified articles in the blanking groove (6) is inserted in the ejecting channel (8). There is a recessed installation groove (10) at the bottom of the moving die (1), and the insert block (11) is detachably fixed in the installation groove (10). There is a through installation hole (12) in the insert block (11). The control valve assembly (7) includes a driving source (71) for controlling the on / off of the glue discharge runner (5) and a nozzle (72). The output shaft (711) of the driving source (71) is inserted in the glue discharge runner (5), and the nozzle (72) is fixed in the installation hole (12). The glue discharge runner (5) is connected to the blanking groove (6) through the nozzle (72). The driving source (71) drives the output shaft (711) to extend into the nozzle (72) to separate the glue discharge runner (5) from the blanking groove (6).

2. The discharge structure of an injection mold according to claim 1, characterized in that: There are several receiving grooves (13) for placing core blocks in the moving die (1), and both ends of the installation groove (10) are respectively connected to the corresponding receiving grooves (13).

3. The discharge structure of an injection mold according to claim 1, characterized in that: There is an annular step surface (121) and a conical abutting surface (122) in the hole wall of the installation hole (12), and the nozzle (72) abuts against the step surface (121) and the abutting surface (122).

4. The discharge structure of an injection mold according to claim 1, 2 or 3, characterized in that: The aperture of one end of the installation hole (12) far from the blanking groove (6) is larger than the aperture of the other end of the installation hole (12).

5. The discharge structure of an injection mold according to claim 1, 2 or 3, characterized in that: There is a water inlet channel (15) and a water outlet channel (16) in the moving die (1). The outer ends of the water inlet channel (15) and the water outlet channel (16) are both connected to the outside, and the inner ends of the water inlet channel (15) and the water outlet channel (16) are respectively connected to both ends of the water channel (14).

6. The discharge structure of an injection mold according to claim 5, characterized in that: The water channel (14) is in a U shape, and the installation hole (12) is located in the area surrounded by the water channel (14).

7. The discharge structure of an injection mold according to claim 5, characterized in that: There is a protruding blanking protrusion (17) at the top of the fixed die (2). The middle of the top of the blanking protrusion (17) is recessed to form the blanking groove (6). When the moving die (1) and the fixed die (2) are clamped, the circumferential edge at the top of the blanking protrusion (17) abuts against the insert block (11).

8. The discharge structure of an injection mold according to claim 7, characterized in that: The circumferential edge at the top of the blanking protrusion (17) is in a square ring shape, and the water channel (14) is arranged along the circumferential edge at the top of the blanking protrusion (17).

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