Injection mold for relay base

Abstract

The invention relates to the technical field of injection molds, in particular to an injection mold for a relay base, which comprises a movable mold, an insertion hole is formed in the movable mold in a penetrating manner along the direction parallel to the movement direction of the movable mold, a jacking pipe is coaxially inserted in the insertion hole, the outer end of the jacking pipe is sealed, a jacking rod is coaxially fixed at the outer end of the jacking pipe, and the inner end of the jacking pipe is connected with a release agent supply device. A plurality of spray pipes are installed on the outer surface of the ejector rod in a foldable mode in the circumferential direction, the inner ends of the spray pipes communicate with the interior of the ejector pipe through hoses, the outer ends of the spray pipes are sealed, the ejector pipe is in transmission connection with a rotating module and an ejection module, the rotating module is used for driving the ejector pipe to rotate, and the ejection module is used for driving the ejector pipe to move in the axial direction. The ejection pipe is arranged on the movable mold in a penetrating mode, a workpiece can be ejected out, the multiple foldable spray pipes on the ejection pipe can be used, under driving of the rotating module, the spray pipes can conduct circular motion between the fixed mold and the movable mold to spray a release agent, and the release agent can be automatically and evenly sprayed to the inner wall of the mold.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, and in particular to an injection mold for a relay base. Background Art

[0002] The relay base is a bracket for installing relays. It is not only convenient for the installation and replacement of relays, but also can fix and protect relays. In the production process of relay base, the base shell needs to be injection molded by injection mold. Since some raw materials of the relay base have high adhesion, such as special engineering plastics, it is easier to produce mold sticking during the injection molding process. Therefore, it is necessary to spray atomized mold release agent on the inner wall surface of the mold during the production process. The main function of mold release agent is to make the product smoothly ejected from the mold cavity, protect the mold surface, prevent the product from sticking to the mold, reduce the impact force on the mold during the molding of the product, reduce the wear of the product and the mold, and play a lubricating role. In addition, the release agent can also adjust the temperature of each part of the mold, maintain the temperature balance of the mold, improve the formability of the product, thereby increasing the mold life and ensuring the quality of the product to a certain extent. The existing injection mold release agent spraying mainly relies on manual handheld spray cans for spraying, which not only has poor spraying uniformity, but is also unsafe. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the prior art that spraying is carried out by manually holding a spray can, which not only has poor spraying uniformity but is also unsafe, and to propose an injection mold for a relay base.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] An injection mold for a relay base is designed, comprising a movable mold, a plug hole is opened through the movable mold along a direction parallel to the moving direction thereof, a push pipe is coaxially inserted in the plug hole, the outer end of the push pipe is sealed, a push rod is coaxially fixed to the outer end of the push pipe, the inner end of the push pipe is connected to a release agent supply device, a plurality of nozzles are foldably installed on the outer surface of the push rod along the circumferential direction, the inner ends of the nozzles are connected to the inside of the push pipe through a hose, the outer ends of the nozzles are sealed, and the push pipe is respectively connected to a rotating module and an ejecting module in transmission, the rotating module is used to drive the push pipe to rotate, and the ejecting module is used to drive the push pipe to move axially.

[0006] Preferably, a group of several spray holes are respectively opened on both sides of the outer surface of the nozzle along the length direction thereof, and the two groups of spray holes are respectively facing the movable mold and the fixed mold.

[0007] Preferably, the rotating mold assembly includes a cylindrical gear ring, a gear, and a motor. A cylindrical gear ring is coaxially fixed on the top tube. The motor is transmission-connected to the cylindrical gear ring via a gear, and the motor is fixed on the movable mold.

[0008] Preferably, the ejection mold assembly includes a cylinder, the cylinder is arranged parallel to the ejection pipe, the output end of the cylinder is fixedly connected to the ejection pipe, and the cylinder is fixed on the movable mold as a whole.

[0009] Preferably, a friction tube is coaxially nested in the nozzle, a plurality of air outlet holes corresponding to the nozzle holes are formed through the friction tube, a friction body is coaxially and telescopically mounted at the outer end of the nozzle through a plastic spring, a gap is left between the friction tube and the outer end of the nozzle, and the friction tube and the friction body are respectively made of plastics of different materials;

[0010] There are two working states between the friction body and the friction tube: in the first working state, the friction body moves to the inside of the friction tube and keeps contact with the inner wall of the friction tube; in the second working state, the friction body moves to the gap between the friction tube and the outer end of the nozzle and does not contact with the inner wall of the friction tube.

[0011] Preferably, the friction tube is made of polyethylene, and the friction body is made of polyurethane.

[0012] Preferably, a metal body is fixed to the outer end of the nozzle, the metal body is grounded, and the friction body can come into contact with the metal body during movement.

[0013] Preferably, the metal body is cylindrical, the metal body is coaxially arranged with the friction body, and the inner diameter of the metal body is greater than or equal to the outer diameter of the friction body.

[0014] The invention provides an injection mold for a relay base, which has the following beneficial effects:

[0015] By penetrating a push pipe on the movable mold, on the one hand, the push rod at the front end of the push pipe can be used to push out the molded workpiece on the movable mold, and on the other hand, the multiple foldable nozzles on the push rod can be used to make a circular motion between the fixed mold and the movable mold under the drive of the rotating mold group to spray the mold release agent, so that the mold release agent can be automatically and evenly sprayed on the inner wall of the mold, which has a good effect and is easy to install;

[0016] By arranging a friction body and a friction tube in the nozzle, static electricity is generated by utilizing the friction between the friction body and the friction tube, so that the atomized release agent sprayed through the nozzle can be attached with electric charge. With the help of electrostatic adsorption, the release agent can be better attached to the inner wall of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1This is a schematic diagram of the structure of a nozzle of an injection mold for a relay base proposed by the present invention before it is unfolded;

[0018] Figure 2 This is a schematic diagram of the structure of a nozzle of an injection mold for a relay base after it is unfolded;

[0019] Figure 3 A schematic diagram of a top pipe structure of an injection mold for a relay base proposed by the present invention;

[0020] Figure 4 Schematic diagram of the working state of the internal friction body of the nozzle of the injection mold for the relay base proposed by the present invention Figure 1 ;

[0021] Figure 5 Schematic diagram of the working state of the internal friction body of the nozzle of the injection mold for the relay base proposed by the present invention Figure 2 ;

[0022] Figure 6 A schematic diagram of the working state of the injection mold for the relay base proposed by the present invention Figure 1 ;

[0023] Figure 7 A schematic diagram of the working state of the injection mold for the relay base proposed by the present invention Figure 1 .

[0024] In the figure: 1. movable mold; 2. socket; 3. ejector pipe; 4. nozzle; 5. hose; 6. cylindrical gear ring; 7. gear; 8. motor; 9. cylinder; 10. ejector rod; 11. spray hole; 12. air outlet; 13. friction tube; 14. friction body; 15. plastic spring; 16. metal body; 17. connecting shaft; 18. flexible pull rod. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] Example 1: Reference Figure 1-3, 6-7, an injection mold for a relay base, comprising a movable mold 1, a plug hole 2 is opened on the movable mold 1 along the direction parallel to the moving direction thereof, a push tube 3 is coaxially inserted in the plug hole 2, the outer end of the push tube 3 is sealed, a push rod 10 is coaxially fixed to the outer end of the push tube 3, the inner end of the push tube 3 is connected to a release agent supply device, a plurality of nozzles 4 are foldably installed on the outer surface of the push rod 10 along the circumferential direction, a connecting shaft 17 is rotatably installed on the nozzle 4, the connecting shaft 17 is fixed on the push rod 10, the nozzle 4 is also connected to the upper part of the push tube 3 through a flexible pull strip 18, the inner end of the nozzle 4 is connected to the inside of the push tube 3 through a hose 5, the outer end of the nozzle 4 is sealed, the push tube 3 is respectively connected to a rotating module and an ejecting module, the rotating module is used to drive the push tube 3 to rotate, and the ejecting module is used to drive the push tube 3 to move axially. By foldably installing a plurality of nozzles 4, after the top pipe 3 drives the nozzles 4 to move out of the insertion hole 2, the nozzles 4 can be automatically unfolded. Combined with the subsequent automatic extension and retraction of the nozzles 4, a wider range of spraying effects can be achieved to cover more of the inner surface of the mold.

[0027] A group of several spray holes 11 are respectively opened on both sides of the outer surface of the spray pipe 4 along the length direction thereof, and two groups of spray holes 11 face the movable mold 1 and the fixed mold respectively.

[0028] The rotating module includes a cylindrical gear ring 6, a gear 7, and a motor 8. The cylindrical gear ring 6 is coaxially fixed on the top tube 3. The motor 8 is connected to the cylindrical gear ring 6 through the gear 7, and the motor 8 is fixed on the movable mold 1. By providing the cylindrical gear ring 6, when the ejection module drives the top tube 3 to move axially, the gear 7 and the cylindrical gear 7 can still maintain a meshing state, but the motor 8 does not need to move synchronously with the top tube 3. The function of the rotating module is to make the top tube 3 rotate, and then the top tube 3 can drive the nozzle 4 to make a circular motion between the fixed mold and the movable mold 1, so that the fixed mold and the movable mold 1 are fully covered by spraying.

[0029] The ejector module includes a cylinder 9, which is arranged parallel to the ejector pipe 3, the output end of the cylinder 9 is fixedly connected to the ejector pipe 3, and the cylinder 9 is fixed on the movable mold 1 as a whole. The function of the ejector module is to enable the ejector pipe 3 to be extended and retracted on the movable mold 1, so that the ejector pipe 3 can eject the formed workpiece attached to the movable mold 1.

[0030] Example 2: Reference Figure 4-5 As another preferred embodiment of the present invention, the difference from Embodiment 1 lies in that a friction tube 13 is coaxially nested in the nozzle 4, a plurality of air outlet holes 12 corresponding to the nozzle holes 11 are penetrated through the friction tube 13, a friction body 14 is coaxially and telescopically mounted at the outer end of the nozzle 4 through a plastic spring 15, a gap is left between the friction tube 13 and the outer end of the nozzle 4, and the friction tube 13 and the friction body 14 are respectively made of plastics of different materials; the plastic spring 15 is in an expanded state when not subjected to external force.

[0031] There are two working states between the friction body 14 and the friction tube 13: in the first working state, the friction body 14 moves to the inside of the friction tube 13 and keeps contact with the inner wall of the friction tube 13; in the second working state, the friction body 14 moves to the gap between the friction tube 13 and the outer end of the nozzle 4 and does not contact with the inner wall of the friction tube 13.

[0032] The friction tube 13 is made of polyethylene, and the friction body 14 is made of polyurethane. After the friction body 14 made of polyurethane rubs against the friction tube 13 made of polyethylene, the outer surface of the friction body 14 is positively charged, and the inner surface of the friction tube 13 is negatively charged.

[0033] A metal body 16 is also fixed at the outer end of the nozzle 4, and the metal body 16 is grounded. During the movement of the friction body 14, the friction body 14 can come into contact with the metal body 16. By providing the grounded metal body 16, the friction body 14 can discharge the metal body 16 when it moves to the end, thereby releasing its own positive charge.

[0034] The metal body 16 is cylindrical, and is coaxially arranged with the friction body 14, and the inner diameter of the metal body 16 is greater than or equal to the outer diameter of the friction body 14. The cylindrical metal body 16 allows the moving friction body 14 to enter therein, so that the outer surface of the friction body 14 can directly contact the inner wall of the metal body 16, thereby better releasing the charge on the outer surface of the friction body 14.

[0035] The overall workflow of the present invention is as follows:

[0036] When the injection molding is completed, the movable mold 1 is controlled to move away. At this time, the molded workpiece is attached to the movable mold 1. At this time, the ejector module is first controlled to drive the ejector tube 3 to move outward, so that the ejector rod 10 at the front end of the ejector tube 3 can eject the workpiece attached to the movable mold 1, so that the ejector tube 3 can be used as an ejector rod;

[0037] When it is necessary to spray the release agent on the inner surface of the movable mold 1 and the fixed mold, the ejection mold assembly is controlled in real time to drive the ejection pipe 3 to move outward, as shown in the attached Figure 7As shown, until the plurality of nozzles 4 on the push rod 10 at the front end of the push pipe 3 are completely moved out of the insertion hole 2, then the motor 8 in the rotating module is controlled to drive the push pipe 3 to rotate, so that the push pipe 3 drives the plurality of nozzles 4 to make a circular motion between the fixed mold and the movable mold 1. At this time, under the action of centrifugal force, the plurality of nozzles 4 are automatically unfolded. At the same time, the friction body 14 in the nozzle 4 will slide outward along the nozzle 4 under the action of centrifugal force. During the sliding process, the friction body 14 rubs against the friction tube 13 in the nozzle 4 until the friction body 14 moves to the nozzle 4 and the friction tube 13, and after the friction body 14 is separated from the friction tube 13, static electricity is generated on the inner surface of the friction tube 13; then the release agent supply device is started, and the release agent supply device inputs the atomized release agent gas into the top pipe, and then synchronously inputs it into the multiple nozzles through the multiple hoses 5 on the top pipe. When the release agent gas passes through the inner surface of the friction tube 13 in the nozzle, it will be charged, and finally sprayed out through the spray hole on the nozzle. Since the sprayed release agent gas is charged, it is easier to adsorb on the inner wall of the fixed mold and the movable mold 1.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An injection mold for a relay base, comprising a movable mold (1), characterized in that: The movable mold (1) is provided with an insertion hole (2) extending through the movable mold (1) parallel to the direction of movement thereof, a push tube (3) is coaxially inserted in the insertion hole (2), the outer end of the push tube (3) is sealed, a push rod (10) is coaxially fixed to the outer end of the push tube (3), the inner end of the push tube (3) is connected to a mold release agent supply device, a plurality of nozzles (4) are foldably mounted on the outer surface of the push rod (10) along the circumferential direction, the inner ends of the nozzles (4) are connected to the inside of the push tube (3) through a hose (5), the outer ends of the nozzles (4) are sealed, and the push tube (3) is respectively connected to a rotating module and an ejection module in a transmission manner, the rotating module is used to drive the push tube (3) to rotate, and the ejection module is used to drive the push tube (3) to move axially.

2. The injection mold for the relay base according to claim 1, characterized in that: A group of several spray holes (11) are respectively opened on both sides of the outer surface of the spray pipe (4) along its length direction, and the two groups of spray holes (11) are respectively facing the movable mold (1) and the fixed mold.

3. The injection mold for the relay base according to claim 1, characterized in that: The rotating mold assembly comprises a columnar gear ring (6), a gear (7), and a motor (8); the columnar gear ring (6) is coaxially fixed on the top tube (3); the motor (8) is transmission-connected to the columnar gear ring (6) via the gear (7); and the motor (8) is fixed on the movable mold (1).

4. The injection mold for the relay base according to claim 1, characterized in that: The ejection mold assembly comprises a cylinder (9), the cylinder (9) is arranged parallel to the ejection pipe (3), the output end of the cylinder (9) is fixedly connected to the ejection pipe (3), and the cylinder (9) is fixed on the movable mold (1) as a whole.

5. The injection mold for the relay base according to claim 1, characterized in that: A friction tube (13) is coaxially nested in the nozzle (4), and a plurality of air outlet holes (12) corresponding to the nozzle holes (11) are formed through the friction tube (13). A friction body (14) is coaxially and telescopically mounted at the outer end of the nozzle (4) via a plastic spring (15), and a gap is left between the friction tube (13) and the outer end of the nozzle (4). The friction tube (13) and the friction body (14) are respectively made of plastics of different materials. There are two working states between the friction body (14) and the friction tube (13): in the first working state, the friction body (14) moves to the inside of the friction tube (13) and maintains contact with the inner wall of the friction tube (13); in the second working state, the friction body (14) moves to the gap between the friction tube (13) and the outer end of the nozzle (4) and does not contact the inner wall of the friction tube (13).

6. The injection mold for the relay base according to claim 5, characterized in that: The friction tube (13) is made of polyethylene, and the friction body (14) is made of polyurethane.

7. The injection mold for the relay base according to claim 5, characterized in that: A metal body (16) is also fixed at the outer end of the nozzle (4); the metal body (16) is grounded, and the friction body (14) can come into contact with the metal body (16) during movement.

8. The injection mold for the relay base according to claim 7, characterized in that: The metal body (16) is cylindrical, the metal body (16) and the friction body (14) are coaxially arranged, and the inner diameter of the metal body (16) is greater than or equal to the outer diameter of the friction body (14).

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