Injection mold for product with insert

Abstract

The injection mold comprises an upper mold plate, a lower mold plate and an ejection mechanism, and the ejection mechanism comprises a mounting plate, an ejection plate and a plurality of ejector pins; the mounting plate is arranged at the bottom of the lower die plate, a lifting cavity is formed in the mounting plate, a lifting plate is slidably connected into the lifting cavity, a first piston cavity is formed in the lifting plate, and a lifting piston plate is slidably connected into the first piston cavity in a sealed mode; the ejector plate is arranged below the mounting plate, and the top of the ejector plate is fixedly connected with the bottom of the lifting piston plate through a transmission shaft; the bottom end of the ejector pin is fixedly connected with the top of the lifting plate, a positioning column for sleeving an insert is arranged at the top end of the ejector pin, and an adsorption opening communicating with the first piston cavity is formed in the top end of the positioning column. According to the injection mold for the product with the insert, the structure of the ejection mechanism is improved, so that the molded product can be ejected, the insert can be adsorbed and fixed under negative pressure, and the insert is prevented from moving along with flowing of injection molding liquid.

Description

TECHNICAL FIELD

[0001] The present application relates to an injection mold for products with inserts. BACKGROUND

[0002] Insert molding (IM) products are products in which a metal insert is fixed in a proper position in an injection mold in advance and then plastic is injected to form the product.

[0003] However, the conventional injection mold for products with inserts has the following problems in actual use: the insert often moves with the flow of the injected plastic during injection molding, resulting in defective products, increased production costs, and reduced work efficiency. Therefore, a corresponding technical solution is needed to solve the above problems. SUMMARY

[0004] To overcome the above-mentioned defects of the prior art, the present application provides an injection mold for products with inserts to solve the problems raised in the background art.

[0005] To achieve the above-mentioned purpose, the technical solution of the present application is to design an injection mold for products with inserts, which comprises an upper mold plate, a lower mold plate, and an ejection mechanism, wherein the upper mold plate and the lower mold plate are closed to form a mold cavity; the ejection mechanism comprises a mounting plate, an ejection plate, and a plurality of ejector pins. The mounting plate is arranged at the bottom of the lower mold plate, and the interior of the mounting plate is provided with a lifting cavity, wherein a lifting plate is slidably connected in the lifting cavity, and the interior of the lifting plate is provided with a first piston cavity, and a lifting piston plate is sealingly and slidably connected in the first piston cavity. The ejection plate is arranged below the mounting plate, and the top of the ejection plate is provided with a transmission shaft, wherein the top end of the transmission shaft extends into the first piston cavity and is fixedly connected with the bottom of the lifting piston plate. The bottom end of the ejector pin is fixedly connected with the top of the lifting plate, and the top end of the ejector pin extends into the mold cavity and is provided with a positioning column for accommodating the insert, wherein the insert is tubular, the top end of the insert is closed, and the bottom end of the insert is open, the top end of the positioning column is provided with a suction port, the interior of the ejector pin is provided with a suction channel communicating with the suction port, and the top of the lifting plate is provided with a communication hole for communicating the suction channel and the first piston cavity.

[0006] Preferably, the outer periphery of the lifting piston plate is provided with a first sealing groove for mounting a sealing ring.

[0007] Preferably, the outer side of the mounting plate is fixedly connected with a push button switch, the push button switch is used for turning on or turning off the mold closing control loop, the side of the lifting plate is provided with a second piston cavity in communication with the first piston cavity, a translation piston plate is sealingly and slidably connected in the second piston cavity, and the second piston cavity is provided with a blocking ring at the communication position with the first piston cavity; a return spring is fixedly connected between the blocking ring and the translation piston plate; the side, away from the return spring, of the translation piston plate is fixedly connected with a translation rod, the other end of the translation rod extends to the outer side of the mounting plate and is fixedly connected with a pressing block for pressing the push button switch; and the side of the mounting plate is provided with an avoiding groove for avoiding the translation rod.

[0008] Preferably, a second sealing groove for mounting a sealing ring is arranged on the outer circumferential surface of the translation piston plate.

[0009] Preferably, the bottom of the mounting plate is fixedly connected with a bottom plate through a cushion block, and the bottom plate is located below the ejection plate.

[0010] The injection mold with insert product provided by the application has the advantages of reasonable structure, improved structure of the ejection mechanism, and the ability to not only eject the molded product, but also realize negative pressure adsorption and fixation of the insert, thereby avoiding the movement of the insert along with the flow of the injection material, and improving the product quality and production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a schematic view of the application.

[0012] Figure 2 is Figure 1 is an enlarged view of A in

[0013] Figure 3 is Figure 1 is an enlarged view of B in DETAILED DESCRIPTION

[0014] The specific embodiments of the application will be further described below in combination with the drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the application, and cannot be used to limit the protection scope of the application.

[0015] The technical solutions of the specific embodiments of the application are as follows: In a specific embodiment, as shown in Figure 1 and Figure 2 The injection mold with insert product provided by the application has the advantages of reasonable structure, improved structure of the ejection mechanism, and the ability to not only eject the molded product, but also realize negative pressure adsorption and fixation of the insert, thereby avoiding the movement of the insert along with the flow of the injection material, and improving the product quality and production efficiency. The mounting plate 4 is arranged at the bottom of the lower die plate 3, and the inside of the mounting plate 4 is provided with a lifting cavity 7, a lifting plate 8 is slidingly connected in the lifting cavity 7, the inside of the lifting plate 8 is provided with a first piston cavity 9, and a lifting piston plate 10 is sealingly and slidingly connected in the first piston cavity 9; The ejection plate 5 is arranged below the mounting plate 4, and the top of the ejection plate 5 is provided with a transmission shaft 11, the top end of the transmission shaft 11 extends into the first piston cavity 9 and is fixedly connected with the bottom of the lifting piston plate 10; The bottom end of the ejector pin 6 is fixedly connected with the top of the lifting plate 8, and the top end of the ejector pin 6 extends into the cavity 3 and is provided with a positioning column 12 for sleeving the insert 100, the insert 100 is tubular, the top end of the insert 100 is closed, and the bottom end of the insert 100 is open, the top end of the positioning column 12 is provided with a suction port 13, the inside of the ejector pin 6 is provided with a suction channel 14 communicating with the suction port 13, and the top of the lifting plate 8 is provided with a communication hole 15 for communicating the suction channel 14 and the first piston cavity 9.

[0016] The working principle of the injection mold with inserts is as follows: When the mold is in the open mold state, the top wall of the lifting plate 8 is in close contact with the top wall of the lifting cavity 7, the top wall of the lifting piston plate 10 is in close contact with the top wall of the first piston cavity 9, and the plurality of ejector pins 6 are in the ejection state, at this time, the insert 100 can be fed, specifically, the plurality of inserts 100 are sleeved outside the positioning columns 12 at the top end of the plurality of ejector pins 6, so that the inner wall of each insert 100 is in close contact with the outer wall of the corresponding positioning column 12, thereby sealing the inner wall of the insert 100 and the outer wall of the positioning column 12, and the suction port 13 of the corresponding positioning column 12 is closed by the inner top wall of each insert 100, so that the first piston cavity 9 is disconnected with the outside; Before the mold is closed, the ejection mechanism is reset, specifically, the lifting piston plate 10 is driven downward by the ejection plate 5 through the transmission shaft 11, and the lifting plate 8 is driven downward together with the lifting piston plate 10 under the action of gravity, until the lifting plate 8 is lowered to the bottom wall thereof being in close contact with the bottom wall of the lifting cavity 7, the insert 100 is moved to the cavity 3 in place by the ejector pin 6, then the lifting plate 8 stops downward, the ejection plate 5 drives the lifting piston plate 10 to continue downward in the first piston cavity 9, and a negative pressure is formed at the suction port 13 in the process, thereby adsorbing and fixing the insert 100, avoiding the insert 100 from moving with the flowing of the injection material, until the lifting piston plate 10 is lowered to the bottom wall thereof being in close contact with the bottom wall of the first piston cavity 9, the lifting piston plate 10 stops downward, the ejection mechanism is reset, then the upper die plate 1 is controlled to be lowered and the lower die plate 2 is closed, and the product is injection molded in the cavity 3, and the molded product is provided with a plurality of inserts 100 to meet the production needs; When the mold is opened, the upper mold plate 1 is first controlled to move upward and separate from the lower mold plate 2, and then the ejection mechanism performs the ejection action. Specifically, the ejection plate 5 drives the lifting piston plate 10 in the first piston cavity 9 to move upward through the transmission shaft 11. During this process, the negative pressure is released. When the lifting piston plate 10 moves upward to the top surface thereof being flush with the top surface of the first piston cavity 9, the lifting piston plate 10 drives the lifting plate 8 to move upward together. When the lifting plate 8 moves upward to the top wall thereof being flush with the top wall of the lifting cavity 7, the ejector pin 6 ejects the formed product outside the cavity 3. Then the lifting piston plate 10 and the lifting plate 8 stop moving upward, the ejection action is completed, and finally the product is removed from the ejector pin 6.

[0017] In another specific embodiment, as shown in Figure 1 the outer periphery of the lifting piston plate 10 is provided with a first sealing groove 16 for mounting a sealing ring.

[0018] The above scheme is adopted: in order to mount a sealing ring on the outer periphery of the lifting piston plate 10, thereby improving the sealing performance between the lifting piston plate 10 and the first piston cavity 9.

[0019] In another specific embodiment, as shown in Figure 1 and Figure 3 the outer side of the mounting plate 4 is fixedly connected with a push button switch 17, the push button switch 17 is used for turning on or turning off the clamping control circuit. When the push button switch 17 is in a pressed state, the clamping control circuit is in a turned-on state. When the push button switch 17 is in an unpressed state, the clamping control circuit is in a turned-off state. The side of the lifting plate 8 is provided with a second piston cavity 18 in communication with the first piston cavity 9. The second piston cavity 18 is sealingly and slidably connected with a translation piston plate 19. The second piston cavity 18 is provided with a blocking ring 20 at the communication position with the first piston cavity 9. The blocking ring 20 and the translation piston plate 19 are fixedly connected with a return spring 21. The side of the translation piston plate 19 away from the return spring 21 is fixedly connected with a translation rod 22. The other end of the translation rod 22 extends to the outer side of the mounting plate 4 and is fixedly connected with a pressing block 23 for pressing the push button switch 17. The side of the mounting plate 4 is provided with an avoiding groove 24 for avoiding the translation rod 22.

[0020] In the present application, since the insert 100 needs to be sleeved on the positioning column 12 of each ejector pin 6 in one-time injection molding, there may be a missing situation in the process of loading the insert 100, and if one or more inserts 100 are missing, the product will be scrapped. Therefore, the above-mentioned scheme is adopted. When the insert 100 is sleeved on the positioning column 12 of each ejector pin 6, the first piston cavity 9 is disconnected with the outside, and in the process of the ejection plate 5 driving the lifting piston plate 10 to move downward in the first piston cavity 9, negative pressure is formed at the adsorption port 13 and the communication between the first piston cavity 9 and the second piston cavity 18, so that the translation piston plate 19 moves a distance in the direction of the first piston cavity 9 against the elastic force of the return spring 21, and the pressure block 23 is driven to move by the translation rod 22 to press the button switch 17, so that the mold clamping control loop is turned on. When the mold clamping control loop is in the on state, the mold can perform subsequent mold clamping and injection molding actions, and when the injection molding is completed, the ejection plate 5 drives the lifting piston plate 10 to move upward in the first piston cavity 9 to release the negative pressure. At this time, the translation piston plate 19 moves away from the first piston cavity 9 under the elastic restoring force of the return spring 21 and is reset. When the positioning column 12 of one or more ejector pins 6 in the plurality of ejector pins 6 is not sleeved with the insert 100, the first piston cavity 9 will be communicated with the outside through the unsealed adsorption port 13. Therefore, the lifting piston plate 10 cannot form negative pressure in the process of moving downward in the first piston cavity 9. At this time, the translation piston plate 19 remains stationary, the button switch 17 is in an unpressed state, and the mold clamping control loop is in a disconnected state. When the mold clamping control loop is in the disconnected state, the mold cannot perform subsequent mold clamping and injection molding actions, thereby avoiding the mold clamping and injection molding actions in the case that the insert 100 is not loaded in place, and preventing the generation of scrapped products.

[0021] In another specific embodiment, as shown in Figure 3 The outer circumferential surface of the translation piston plate 19 is provided with a second sealing groove 25 for installing a sealing ring.

[0022] The above-mentioned scheme is adopted: in order to install a sealing ring on the outer circumferential surface of the translation piston plate 19, thereby improving the sealing performance between the translation piston plate 19 and the second piston cavity 18.

[0023] In another specific embodiment, as shown in Figure 1 The bottom of the mounting plate 4 is fixedly connected with a bottom plate 27 through a cushion block 26, and the bottom plate 27 is located below the ejection plate 5.

[0024] The above-mentioned only is the preferred embodiment of the present application, it should be pointed out, for the ordinary skilled in the art, without departing from the technical principles of the present application, can make a number of improvements and refinements, these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. An injection mold for a product with inserts, comprising an upper mold plate, a lower mold plate, and an ejection mechanism, wherein the upper mold plate and the lower mold plate close to form a cavity, characterized in that, The ejection mechanism includes a mounting plate, an ejection plate, and multiple ejector pins; The mounting plate is located at the bottom of the lower template, and the mounting plate has a lifting cavity inside. A lifting plate is slidably connected in the lifting cavity. A first piston cavity is located inside the lifting plate, and a lifting piston plate is slidably connected in the first piston cavity. The ejector plate is located below the mounting plate, and the top of the ejector plate is provided with a drive shaft. The top end of the drive shaft extends into the first piston chamber and is fixedly connected to the bottom of the lifting piston plate. The bottom end of the ejector pin is fixedly connected to the top of the lifting plate, and the top end of the ejector pin extends into the cavity and is provided with a positioning post for the insert to be installed. The insert is tubular, with the top end closed and the bottom end open. The top end of the positioning post is provided with an adsorption port. The interior of the ejector pin is provided with an adsorption channel communicating with the adsorption port. The top of the lifting plate is provided with a connecting hole for communicating with the adsorption channel and the first piston chamber.

2. The injection mold for products with inserts according to claim 1, characterized in that, The outer circumferential surface of the lifting piston plate is provided with a first sealing groove for installing a sealing ring.

3. The injection mold for products with inserts according to claim 1, characterized in that, A push-button switch is fixedly connected to the outer side of the mounting plate. The push-button switch is used to turn the mold closing control circuit on or off. A second piston chamber communicating with the first piston chamber is provided on the side of the lifting plate. A translation piston plate is slidably connected in the second piston chamber. A retaining ring is provided at the communication point between the second piston chamber and the first piston chamber. A return spring is fixedly connected between the retaining ring and the translation piston plate. A translation rod is fixedly connected to the side of the translation piston plate away from the return spring. The other end of the translation rod extends to the outer side of the mounting plate and is fixedly connected to a pressure block for pressing the push-button switch. A clearance groove is provided on the side of the mounting plate to avoid the translation rod.

4. The injection mold for products with inserts according to claim 3, characterized in that, The outer circumferential surface of the translation piston plate is provided with a second sealing groove for installing a sealing ring.

5. The injection mold for products with inserts according to claim 1, characterized in that, The bottom of the mounting plate is fixedly connected to a base plate by a pad, and the base plate is located below the top plate.

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