An automatic separation mechanism for the gate of an injection mold

Abstract

The present invention discloses an automatic separation mechanism for a gate of an injection mold, which includes an injection runner recessed between an upper mold and a lower mold, and a gate insert disposed between the injection cavity and the injection runner on the left and right sides respectively and passing through the lower mold; a communicating gate is formed in the gate insert, and the upper surface of the communicating gate gradually extends downward along the direction close to the injection cavity and forms an acute angle with the left side surface of the gate insert; the injection runner includes a hooking hole recessed downward from its lower surface in the lower mold and located below the communicating gate; the automatic separation mechanism further includes a first ejector rod that is liftable and passes through the lower mold, and the top end of the first ejector rod is located below the injection runner and between the gate insert and the hooking hole. For the automatic separation mechanism for a gate of an injection mold according to the present invention, after injection molding, during the product demolding process, automatic separation of the product from the gate can be achieved.

Description

Technical Field

[0001] The present invention relates to an automatic separation mechanism for a gate of an injection mold. Background Art

[0002] In the injection molding process, for products with open side gates, after the products are injection molded, it is necessary to cut off the runners manually or with specific fixtures subsequently. This production method is prone to problems such as missed cutting and the inclusion of cut-off runners in the products. Especially when producing products that require cavity encapsulation in multiple cavities, it is extremely easy to cause misloading of products in different cavities. When parts are produced in large quantities and in multiple shifts, problems such as missed cutting and misloading are extremely difficult to be detected in a timely manner. These problems increase the production cost and production cycle, and increase the quality control risk. Summary of the Invention

[0003] The purpose of the present invention is to provide an automatic separation mechanism for a gate of an injection mold, which can realize the automatic separation of the product and the gate after injection molding.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is:

[0005] An automatic separation mechanism for a gate of an injection mold, including an injection runner recessed between an upper mold and a lower mold, and a gate insert disposed on the left and right sides and communicating with an injection cavity and the injection runner respectively and passing through the lower mold;

[0006] A communicating gate is provided in the gate insert, and the upper surface of the communicating gate gradually extends downward along the direction close to the injection cavity, and forms an acute angle with the left side surface of the gate insert;

[0007] The injection runner includes a hooking hole recessed from its lower surface into the lower mold and located below the communicating gate;

[0008] The automatic separation mechanism further includes a first ejector rod that is vertically movable and passes through the lower mold, and the top end of the first ejector rod is located below the injection runner. The top end of the first ejector rod is located between the gate insert and the hooking hole.

[0009] Preferably, the lower surface of the injection runner between the gate insert and the top end of the first ejector rod is concavely curved upward.

[0010] Preferably, the gate insert gradually tapers from bottom to top.

[0011] Preferably, the hooking hole gradually inclines downward and approaches the first ejector rod.

[0012] Preferably, the injection runner further includes a cylindrical hole recessed from its lower surface into the lower mold and located above the first ejector rod.

[0013] More preferably, the injection runner includes a runner body extending in the left - right direction. The gate insert is communicated with the left end of the runner body through the connecting gate, and both the cylindrical hole and the hooking hole are located below the runner body.

[0014] Preferably, the gate insert is detachably inserted downward into the lower mold, and the upper end of the gate insert penetrates upward through the lower mold.

[0015] Preferably, the automatic separation mechanism further includes a driving assembly for driving the first ejector rod to move upward, and the driving assembly is also used to delay the upward movement of the lower mold.

[0016] More preferably, the driving assembly includes a fixing plate, a lifting plate disposed above the fixing plate and capable of lifting, a driving rod passing through the fixing plate and capable of lifting with its top end fixed on the lifting plate, and the lower end of the first ejector rod is fixed on the lifting plate;

[0017] The driving assembly further includes a guiding groove disposed in the lifting plate, a guiding column disposed in the guiding groove and capable of lifting, limiting rings disposed at the upper and lower ends of the guiding groove for limiting the guiding column, a second ejector rod with its upper end connected to the bottom end of the guiding column and its lower end abutting against the fixing plate, and a third ejector rod with its two ends respectively connected to the top end of the guiding column and the lower mold.

[0018] Due to the application of the above - mentioned technical solution, the present invention has the following advantages compared with the prior art: For an automatic separation mechanism for the gate of an injection mold of the present invention, by setting the gate insert, an open - type side gate is changed into a closed - type side gate; by setting the inclination direction of the upper surface of the connecting gate, when the product is demolded, the first ejector rod jacks up the solidified runner colloid in the injection runner, and the cutting is performed through the acute - angle edge above the connecting gate, so that the automatic separation of the product from the gate on the runner colloid can be realized; by setting the hooking hole, it can be avoided that the runner colloid turns towards the gate insert side during the jacking process, resulting in inability to be cut by force, thus improving the success rate of cutting. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Attached Figure 1 is a schematic structural diagram of the device of the present invention.

[0020] Wherein: 1. Lower mold; 2. Injection runner; 3. Injection cavity; 4. Gate insert; 5. Connecting gate; 6. Hooking hole; 7. First ejector rod; 8. Cylindrical hole; 9. Fixing plate; 10. Lifting plate; 11. Driving rod; 12. Guiding groove; 13. Guiding column; 14. Limiting ring; 15. Second ejector rod; 16. Third ejector rod. DETAILED DESCRIPTION OF THE INVENTION

[0021] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0022] Refer to Figure 1 As shown, the above-mentioned automatic separation mechanism for the gate of an injection mold includes an injection runner 2 recessed between an upper mold (not shown in the figure) and a lower mold 1, and a gate insert 4 that is respectively connected to the injection cavity 3 and the injection runner 2 on the left and right sides and penetrates through the lower mold 1. The injection cavity 3 is also recessed between the upper mold and the lower mold 1 and is a cavity for product molding. In this embodiment, the injection cavity 3, the gate insert 4, and the injection runner 2 are connected in sequence from left to right. By setting the gate insert 4, the open side gate is changed into a closed side gate.

[0023] A connecting gate 5 is provided in the above-mentioned gate insert 4. The connecting gate 5 penetrates through the gate insert 4 in the left-right direction. The left side of the connecting gate 5 is connected to the injection cavity 3, and the right side of the connecting gate 5 is connected to the injection runner 2. The upper surface of the connecting gate 5 gradually extends downward along the direction close to the injection cavity 3 (from right to left) and forms an acute angle with the left side surface of the gate insert 4, and the tip of the acute angle faces downward.

[0024] By setting the inclination direction of the upper surface of the connecting gate 5, when the product is molded and demolded, the solidified runner colloid in the injection runner 2 is jacked up, and the runner colloid is cut off through the acute angle edge above the connecting gate 5, so that the automatic separation of the product from the gate on the runner colloid can be realized.

[0025] The above-mentioned injection runner 2 includes a hooking hole 6 recessed downward from its lower surface in the lower mold 1 and located below the connecting gate 5. The above-mentioned automatic separation mechanism for the gate of an injection mold further includes a first ejector rod 7 that is liftable and penetrates through the lower mold 1, and the top end of the first ejector rod 7 is located below the injection runner 2.

[0026] In this embodiment, the hooking hole 6 gradually inclines downward and approaches the first ejector rod 7 from top to bottom.

[0027] By setting the hooking hole 6, the runner colloid forms a hook in the hooking hole 6, which can prevent the runner colloid from flipping to the side of the gate insert 4 during the process of being jacked up by the first ejector rod 7, resulting in being unable to receive force for cutting, and improves the success rate of cutting. The hook can hook the right side of the runner colloid. When the first ejector rod 7 jacks up the middle part of the runner colloid, the left side of the runner colloid can receive force and be pulled upward to the right, so as to cut off the runner colloid through the acute angle edge above the connecting gate 5.

[0028] In this embodiment, the lower surface of the injection runner 2 between the gate insert 4 and the top end of the first ejector rod 7 is concave upward in an arc shape.

[0029] Through this setting, an arc transition area is formed, which is more conducive to the deformation of the left side of the runner colloid during the cutting process of the runner colloid, further improving the success rate of cutting.

[0030] The above-mentioned injection runner 2 further includes a cylindrical hole 8 recessed downward from its lower surface in the lower mold 1 and located above the first ejector rod 7. The cylindrical hole 8 is directly above the first ejector rod 7 and extends coaxially with the first ejector rod 7.

[0031] By setting the cylindrical hole 8, the runner colloid forms a cylinder in the cylindrical hole 8. When the first ejector rod 7 moves upward, pressure is applied to the runner colloid through the cylinder, which is also conducive to the deformation of the left side of the runner colloid. At the same time, it can prevent the hook from prematurely disengaging from the hooking hole 6, further improving the success rate of cutting.

[0032] In this embodiment, the above-mentioned injection runner 2 includes a runner body extending in the left-right direction. The gate insert 4 is connected to the left end of the runner body through the connecting gate 5. The cylindrical hole 8 and the hooking hole 6 are both located below the runner body, that is, the cylinder and the hook are both formed below the runner body.

[0033] In this embodiment, the above-mentioned gate insert 4 gradually tapers and contracts from bottom to top. Through this setting, the angle of the acute angle between the upper surface of the connecting gate 5 and the left side surface of the gate insert 4 is reduced, further improving the success rate of cutting and making the cut smooth.

[0034] The above-mentioned automatic separation mechanism for the gate of the injection mold further includes a driving assembly for driving the first ejector rod 7 to move upward, and the driving assembly is also used to delay the driving of the lower mold 1 to move upward.

[0035] After the product is injection molded and the mold is opened, the upper mold first moves upward. Then the driving assembly drives the first ejector rod 7 to jack up the solidified runner colloid in the injection runner 2, and cuts the gate of the runner colloid through the acute angle edge above the connecting gate 5. Then the driving assembly delays the driving of the lower mold 1 to move upward, drives the product to move upward synchronously, and then the product after cutting the gate can be grasped by the manipulator.

[0036] In this embodiment, the gate insert 4 is detachably inserted into the lower mold 1, and the upper end of the gate insert 4 passes through the lower mold 1 upward. Through this setting, when the lower mold 1 moves upward, the gate insert 4 can fall downward from the lower mold 1 due to its own weight.

[0037] The above-mentioned driving assembly includes a fixed plate 9, a lifting plate 10 arranged above the fixed plate 9 and capable of lifting, a driving rod 11 passing through the fixed plate 9 and capable of lifting with its top fixed on the lifting plate 10, and the lower end of the first ejector rod 7 is fixed on the lifting plate 10.

[0038] The above driving assembly further includes a guide groove 12 provided in the lifting plate 10, a guide post 13 that is liftable and provided in the guide groove 12, limiting rings 14 provided at the upper and lower ends of the guide groove 12 and used for limiting the guide post 13, a second ejector rod 15 with its upper end connected to the bottom end of the guide post 13 and its lower end abutting against the fixed plate 9, and a third ejector rod 16 with its two ends respectively connected to the top end of the guide post 13 and the lower mold 1.

[0039] See Figure 1 As shown, the guide groove 12 is located in the lifting plate 10, and the limiting rings 14 at its upper and lower ends are also both located in the lifting plate 10. The length of the guide groove 12 is greater than the length of the guide post 13. The second ejector rod 15 passes through the lower limiting ring 14 and extends downward out of the lifting plate 10; the third ejector rod 16 passes through the upper limiting ring 14 and extends upward out of the lifting plate 10.

[0040] When the lower mold 1 is in the mold closing position, there is a vertical interval arrangement between the bottom end of the guide post 13 and the lower limiting ring 14. When opening the mold, the driving rod 11 drives the lifting plate 10 to rise, and the first ejector rod 7 rises synchronously. The guide post 13 remains stationary until the lower limiting ring 14 abuts against the lower end of the guide post 13 to form a delayed lifting of the lower mold 1. Then the driving rod 11 drives the lifting plate 10 to continue rising. At this time, the first ejector rod 7 and the third ejector rod 16 rise synchronously, and the second ejector rod 15 disengages upward from the fixed plate 9.

[0041] The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it. It cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. An automatic separation mechanism for the gate of an injection mold, characterized in that: It includes an injection molding runner recessed between the upper mold and the lower mold, and gate inserts that are respectively connected to the injection cavity and the injection molding runner on the left and right sides and penetrate through the lower mold; A connecting gate is provided in the gate insert. The upper surface of the connecting gate gradually extends downward along the direction close to the injection cavity and forms an acute angle with the left side surface of the gate insert; The injection molding runner includes a hooking hole recessed downward from its lower surface in the lower mold and located below the connecting gate; The automatic separation mechanism further includes a first ejector rod that is liftable and penetrates through the lower mold, and the top end of the first ejector rod is located below the injection molding runner. The top end of the first ejector rod is located between the gate insert and the hooking hole; the lower surface of the injection molding runner between the gate insert and the top end of the first ejector rod is arcuately concave upward; The gate insert gradually tapers and contracts from bottom to top; The automatic separation mechanism further includes a driving component for driving the first ejector rod to move upward. The driving component is also used for delaying the driving of the lower mold to move upward.

2. The automatic separation mechanism for the gate of an injection mold according to claim 1, wherein: The hooking hole gradually inclines closer to the first ejector rod from top to bottom.

3. The automatic separation mechanism for the gate of an injection mold according to claim 1, wherein: The injection molding runner further includes a cylindrical hole recessed downward from its lower surface in the lower mold and located above the first ejector rod.

4. An automatic separation mechanism for an injection mold gate according to claim 3, characterized in that: The injection molding runner includes a runner body extending in the left-right direction. The gate insert is connected to the left end of the runner body through the connecting gate. The cylindrical hole and the hooking hole are both located below the runner body.

5. The automatic separation mechanism for the gate of an injection mold according to claim 1, characterized in that: The gate insert is detachably penetrated through the lower mold, and the upper end of the gate insert penetrates upward through the lower mold.

6. The automatic separation mechanism for the gate of an injection mold according to claim 1, characterized in that: The driving component includes a fixing plate, a lifting plate that is liftable and provided above the fixing plate, a driving rod that is liftable and penetrates through the fixing plate, and the top end of the driving rod is fixed on the lifting plate; the lower end of the first ejector rod is fixed on the lifting plate; The driving component further includes a guiding groove provided in the lifting plate, a guiding column that is liftable and provided in the guiding groove, limiting rings provided at the upper and lower ends of the guiding groove for limiting the guiding column, a second ejector rod with its upper end connected to the bottom end of the guiding column and its lower end abutted against the fixing plate, and a third ejector rod with its two ends respectively connected to the top end of the guiding column and the lower mold.

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