Photoelectric combined detection mechanism for detecting metal insert in cavity

Abstract

The utility model discloses a photoelectric combined detection mechanism for detecting a metal insert in a cavity, which is characterized in that the mechanism comprises an insert fixing shaft (1) arranged in a mold, an insert positioning part (3) matched with an insert (2) is arranged at the end part of the insert fixing shaft (1), a guide sliding sleeve (4) is sleeved in an inner cavity of the insert fixing shaft (1), and the insert positioning part (3) is connected with the guide sliding sleeve (4). A trigger mandrel (5) is movably connected in the guide sliding sleeve (4), a magnet (6) is arranged at one end, close to the insert positioning part (3), of the trigger mandrel (5), a shielding part (7) is arranged at the other end of the trigger mandrel (5), a limiting block (8) is arranged in the middle of the trigger mandrel (5), and a limiting step (9) matched with the limiting block (8) is arranged in the guide sliding sleeve (4).

Description

Technical Field

[0001] The utility model relates to the field of injection molding, in particular to a photoelectric combined detection mechanism for detecting metal inserts in a cavity. Background Art

[0002] When using injection molds to produce plastic products, some plastic products need to have metal inserts (common inserts include nuts). When producing this type of large product, the insert must first be placed in a specific position in the mold cavity, and then the mold must be closed and the material must be injected. The product formed after the material is cooled will contain the above-mentioned metal insert.

[0003] If the injection molding process is started without placing the metal insert, defective products will inevitably be produced. For this reason, the traditional molds for producing such products are equipped with detection mechanisms to ensure that the metal insert is not missing.

[0004] However, in traditional mold structures, the most commonly used metal inserts (nuts) are generally fixed by mandrel positioning, and the mandrel is relatively small, which results in extremely limited space for arranging sensors. Moreover, the sensor here is preferably a non-contact sensor (contact sensors require a protective mechanism for indirect detection to prevent the molten material from burning the contact sensor), while the commonly used non-contact sensors (inductive sensors, capacitive sensors) are relatively large and difficult to arrange inside the mandrel. Moreover, since the mold is full of metal parts, these parts may interfere with the above two sensors, which may easily lead to false alarms.

[0005] Therefore, a method or device capable of solving the above problems is now needed. Summary of the invention

[0006] The utility model aims to solve the above-mentioned deficiencies in the prior art and proposes a photoelectric combined detection mechanism for detecting metal inserts in a cavity with simple structure, ingenious design, reasonable layout, high accuracy and reliability.

[0007] The technical solution of the utility model is: a photoelectric combined detection mechanism for detecting metal inserts in a mold cavity, characterized in that: the mechanism includes an insert fixing shaft 1 arranged in the mold, an insert positioning portion 3 matching the insert 2 is arranged at the end of the insert fixing shaft 1, a guide sleeve 4 is sleeved in the inner cavity of the insert fixing shaft 1, a trigger core shaft 5 is movably connected in the guide sleeve 4, a magnet 6 is arranged at one end of the trigger core shaft 5 close to the insert positioning portion 3, and a shielding portion 7 is arranged at the other end, a limiting block 8 is arranged in the middle of the trigger core shaft 5, and a limiting step 9 matching the limiting block 8 is arranged in the guide sleeve 4,

[0008] The insert fixing shaft 1 is connected to an optical fiber pipeline 10 at one end away from the insert positioning portion 3. A first optical fiber 11 and a second optical fiber 12 are arranged in the optical fiber pipeline 10. A gap 13 is left between the ends of the first optical fiber 11 and the second optical fiber 12. The shielding portion 7 can move to the gap 13 and cut off the conduction signal between the first optical fiber 11 and the second optical fiber 12. The optical fiber pipeline 10 is connected to a vacuum generator 14, that is, the vacuum generator 14 can create a vacuum environment in the optical fiber pipeline 10.

[0009] The air outlet of the vacuum generator 14 is connected to the main air source 16 through a three-way air control valve 15. A three-way mechanical valve 17 is arranged between the main air source 16 and the three-way air control valve 15. The three-way mechanical valve 17 is arranged on one side of the movable template. When the mold is closed, the three-way mechanical valve 17 can be triggered by a trigger block arranged on the fixed template and make a switching action. The three-way air control valve 15 is also connected to a trigger pipeline 18. A throttle valve 19 and an air storage container 20 are arranged on the trigger pipeline 18. The inlet end of the trigger pipeline 18 is connected to the outlet end of the three-way mechanical valve 17.

[0010] A vacuum sensor 21 is also provided in the optical fiber pipeline 10 .

[0011] Compared with the prior art, the utility model has the following advantages:

[0012] The photoelectric combined detection mechanism for detecting metal inserts in the cavity of this structural form has a simple structure, ingenious design and reasonable layout. It aims at the problems existing in the working process of the traditional metal insert detection mechanism and designs a photoelectric combined structure. It uses the suction force generated by the vacuum generator to drive the trigger mandrel to move. The trigger mandrel can control the conduction state of the two optical fibers, and judge whether the metal insert is in place by the conduction state of the optical fibers. At the same time, its vacuum generator is also connected to the air source through a special air path, and the mold opening / closing state can determine whether the above air path is conductive. That is to say, the vacuum generator can switch the working state with the action of the mold, so as to realize the automatic detection mechanism homing action, so as to facilitate the staff (or manipulator) to put the metal insert into the mold cavity. In addition, the manufacturing process of this detection mechanism is simple and the manufacturing cost is low. Therefore, it can be said that it has many advantages and is particularly suitable for promotion and application in this field. Its market prospects are very broad. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figures 1 to 3 It is a schematic diagram of the movement process of the mechanical structure part in the embodiment of the utility model.

[0014] Figures 4 to 6 It is a schematic diagram of the action process of the gas circuit control part in the embodiment of the utility model. DETAILED DESCRIPTION

[0015] The specific implementation of the present utility model will be described below in conjunction with the accompanying drawings. Figures 1 to 6 As shown: a photoelectric combined detection mechanism for detecting metal inserts in a mold cavity, which includes an insert fixing shaft 1 arranged in the mold, an insert positioning portion 3 matching the insert 2 is arranged at the end of the insert fixing shaft 1, a guide sleeve 4 is sleeved in the inner cavity of the insert fixing shaft 1, a trigger core shaft 5 is movably connected in the guide sleeve 4, a magnet 6 is arranged at one end of the trigger core shaft 5 close to the insert positioning portion 3, and a shielding portion 7 is arranged at the other end, a limiting block 8 is arranged in the middle of the trigger core shaft 5, and a limiting step 9 matching the limiting block 8 is arranged in the guide sleeve 4,

[0016] The insert fixing shaft 1 is connected to an optical fiber pipeline 10 at one end away from the insert positioning portion 3. A first optical fiber 11 and a second optical fiber 12 are arranged in the optical fiber pipeline 10. A gap 13 is left between the ends of the first optical fiber 11 and the second optical fiber 12. The shielding portion 7 can move to the gap 13 and cut off the conduction signal between the first optical fiber 11 and the second optical fiber 12. The optical fiber pipeline 10 is connected to a vacuum generator 14, that is, the vacuum generator 14 can create a vacuum environment in the optical fiber pipeline 10.

[0017] The air outlet of the vacuum generator 14 is connected to the main air source 16 through a three-way air control valve 15. A three-way mechanical valve 17 is arranged between the main air source 16 and the three-way air control valve 15. The three-way mechanical valve 17 is arranged on one side of the movable template. When the mold is closed, the three-way mechanical valve 17 can be triggered by a trigger block arranged on the fixed template and make a switching action. The three-way air control valve 15 is also connected to a trigger pipeline 18. A throttle valve 19 and an air storage container 20 are arranged on the trigger pipeline 18. The inlet end of the trigger pipeline 18 is connected to the outlet end of the three-way mechanical valve 17.

[0018] A vacuum sensor 21 is also provided in the optical fiber pipeline 10 .

[0019] The working process of the photoelectric combined detection mechanism for detecting metal inserts in the cavity of the utility model embodiment is as follows: in the open mold state, the trigger block on the fixed mold plate does not contact the three-way mechanical valve 17, and the three-way mechanical valve 17 is in the conductive state. At this time, the main gas source 16 is connected to the vacuum generator 14, and the vacuum generator 14 works to form a negative pressure in the optical fiber pipeline 10, so that the trigger core shaft 5 is adsorbed to one end close to the optical fiber. At this time, the shielding part moves to the gap 13, cutting off the conductive signal between the first optical fiber 11 and the second optical fiber 12. That is to say, in this state, the first optical fiber 11 and the second optical fiber 12 are not conductive. At this time, the control system determines that There is no insert 2 in the cut-out cavity, and the insert 2 can be placed therein; in the above process, a part of the gas enters the gas storage container 20 through the throttle valve 19, and the pressure in the gas storage container 20 gradually increases. When the pressure value reaches the trigger pressure of the three-way gas control valve 15, the three-way gas control valve 15 is actuated to cut off the passage between the main gas source 16 and the vacuum generator 14, and the vacuum generator 14 automatically stops working. This design of the throttle valve 19 plus the gas storage container 20 is equivalent to adding an air path for delaying the action of the three-way gas control valve 15, so as to achieve the purpose of automatically controlling the vacuum generator 14 to stop working, and at this time, the triggering mandrel 5 is not subjected to force;

[0020] The insert 2 is sleeved on the insert positioning part 3 by a manipulator or manual loading. Since the insert 2 is made of metal, when the insert 2 is placed in place, it will generate suction force on the magnet 6. Since the vacuum generator 14 has stopped working, the trigger mandrel 5 will move toward the direction of the insert 2 under the action of the magnetic force, and the shielding part 7 will leave the gap 13. The first optical fiber 11 and the second optical fiber 12 are connected to each other, and the control system can determine that the insert 2 has been placed in the cavity at this time;

[0021] After the mold is closed, the molding machine injects the molten material into the mold cavity, and the material is wrapped around the insert 2. After cooling and molding, a product with the insert 2 is formed; when the mold is closed, the trigger block contacts the three-way mechanical valve 17, and the three-way mechanical valve 17 is switched to the closed state, and the vacuum generator 14 does not work at this time;

[0022] The mold is opened, the mold is demoulded, the manipulator or the human takes the material, and the product is taken away. At the same time, the three-way mechanical valve 17 is restored to the conductive state, and the vacuum generator 14 works first, and the trigger core shaft 5 is adsorbed to the state of cutting off the optical fiber conduction. The control system re-determines that there is no insert 2 in the cavity at this time. After a period of time, the vacuum generator 14 stops working again, and a new insert 2 is placed in the cavity, the trigger core shaft 5 moves in the opposite direction, and the optical fiber signal is turned on. The control system determines that the insert 2 has been placed in place, and the subsequent mold closing and injection molding operations can be carried out;

[0023] Just repeat the above process.

Claims

1. A photoelectric combined detection mechanism for detecting metal inserts in a cavity, characterized in that: The mechanism comprises an insert fixing shaft (1) arranged in the mold, an insert positioning portion (3) matching the insert (2) being arranged at the end of the insert fixing shaft (1), a guide sleeve (4) being sleeved in the inner cavity of the insert fixing shaft (1), a trigger core shaft (5) being movably connected in the guide sleeve (4), a magnet (6) being arranged at one end of the trigger core shaft (5) close to the insert positioning portion (3), and a shielding portion (7) being arranged at the other end, a limit block (8) being arranged in the middle of the trigger core shaft (5), and a limit step (9) matching the limit block (8) being arranged in the guide sleeve (4), An optical fiber pipeline (10) is connected to one end of the insert fixing shaft (1) away from the insert positioning portion (3); a first optical fiber (11) and a second optical fiber (12) are arranged in the optical fiber pipeline (10); a gap (13) is left between the ends of the first optical fiber (11) and the second optical fiber (12); the shielding portion (7) can move to the gap (13) and cut off the conduction signal between the first optical fiber (11) and the second optical fiber (12); the optical fiber pipeline (10) is connected to a vacuum generator (14), that is, the vacuum generator (14) can create a vacuum environment in the optical fiber pipeline (10); The air outlet of the vacuum generator (14) is connected to the main air source (16) via a three-way air control valve (15); a three-way mechanical valve (17) is provided between the main air source (16) and the three-way air control valve (15); the three-way mechanical valve (17) is provided on one side of the movable mold plate; when the mold is closed, the three-way mechanical valve (17) can be triggered by a trigger block provided on the fixed mold plate and perform a switching action; the three-way air control valve (15) is also connected to a trigger pipeline (18); a throttle valve (19) and an air storage container (20) are provided on the trigger pipeline (18); the inlet end of the trigger pipeline (18) is connected to the outlet end of the three-way mechanical valve (17); A vacuum sensor (21) is also provided in the optical fiber pipeline (10).

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