Automatic front safety door mechanical protection lock for large injection molding machine

Abstract

The utility model discloses a large -scale injection molding machine automatic front safety door mechanical protection lock relates to the mechanical protection lock field of injection molding machine front door, including fixed door, the fixed door has the import and export on, the inner wall axial sliding of fixed door installs the sliding door to the import and export is closed or cancel the closure, the lower portion of fixed door is installed with the drive mechanism of drive sliding door moves, the front end of fixed door is installed with the locking mechanism that penetrates to the fixed door back end one side away from sliding door, the back end of sliding door integrative has the limit stop that projects inwards below, the limit stop cooperation locking mechanism is used for limiting the sliding door in the open state. The utility model discloses through setting limit mechanism, the design of limit mechanism can be effective to the sliding door and limit, avoid its automatic closing, thereby avoided the security risk problem caused by the automatic closing of sliding door.

Description

Technical Field

[0001] This utility model relates to the field of mechanical protection locks for the front door of injection molding machines, specifically a mechanical protection lock for the automatic front safety door of a large injection molding machine. Background Technology

[0002] Normally, after the front door of an injection molding machine is closed, a proximity switch will send an electrical signal to the controller upon sensing that the front door is closed. The controller then controls the injection molding machine to close the mold. However, due to program errors or operational errors caused by increased usage time, the front door of the injection molding machine may automatically close without human intervention. If the molded part has not yet been removed, the closed mold of the injection molding machine can pose a very serious safety risk to the workers. Utility Model Content

[0003] The purpose of this utility model is to provide a mechanical protection lock for the automatic front safety door of a large injection molding machine in order to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a mechanical safety lock for an automatic front safety door of a large injection molding machine, comprising a fixed door with an inlet and outlet, a sliding door axially slidably mounted on the inner wall of the fixed door to close or unclose the inlet and outlet, a driving mechanism for moving the sliding door installed below the fixed door, a locking mechanism extending through to the back end of the fixed door installed on the front end of the fixed door away from the sliding door, and an inwardly protruding limiting plate integrally formed below the back end of the sliding door, the limiting plate cooperating with the locking mechanism to limit the sliding door in the open state.

[0005] As a further embodiment of this utility model: the driving mechanism includes a forward and reverse reversing motor fixedly installed below the front end of the fixed door, two tensioning wheels rotatably installed on the lower inner wall of the fixed door, the two tensioning wheels are connected by belt drive, a connecting block is fixedly installed on the upper outer periphery of the belt, and the bottom end of the connecting block is fixedly connected to the bottom end of the sliding door.

[0006] As a further embodiment of this utility model: the locking mechanism includes a rack extending from the front end of the fixed door to the back end of the fixed door, a connecting plate fixedly installed at the front end of the rack, a handle fixedly installed at the front end of the connecting plate by bolts, a guide shaft welded to the front end of the fixed door slidably installed at the end of the connecting plate away from the rack, and a No. 1 spring sleeved with the guide shaft abutting between the back end of the connecting plate and the front end of the fixed door.

[0007] As a further embodiment of this utility model: the locking mechanism further includes a gear rotatably mounted on the back end of the fixed door via a bracket, the gear meshing with the rack, a movable plate coaxially mounted on one end of the gear, a locking block slidably mounted on the inner wall of the movable plate, the bottom end of the locking block penetrating to the bottom of the movable plate, and a pressure-bearing inclined surface formed on the side of the locking block near the limiting plate.

[0008] As a further embodiment of this utility model: a vertical rod that is slidably connected to the locking block is fixedly installed on the inner wall of the movable plate, and a second spring that is sleeved with the vertical rod is abutted between the top of the locking block and the top of the inner wall of the movable plate.

[0009] As a further embodiment of this utility model: a pressing block is fixedly installed on the back end of the connecting plate, a pressing switch aligned with the pressing block is installed on the front end of the fixed door, and proximity switches for sensing the opening and closing of the sliding door are installed at both ends of the inner wall of the fixed door. The proximity switches and pressing switches are electrically connected to the forward and reverse motor.

[0010] Compared with the prior art, the beneficial effects of this utility model are: 1. By setting a limit mechanism, the sliding door can be effectively limited to prevent it from closing automatically, thus avoiding the safety risks caused by the automatic closing of the sliding door. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of this utility model from another perspective; Figure 3 This is a schematic diagram showing the connection between the drive mechanism and the sliding door of this utility model; Figure 4 This is a schematic diagram of the locking mechanism of this utility model.

[0012] In the diagram: 1. Fixed door; 2. Sliding door; 3. Forward and reverse motor; 4. Push switch; 5. Rack; 6. Connecting plate; 7. Handle; 8. Guide shaft; 9. Spring No. 1; 10. Limiting plate; 11. Pressing block; 12. Bracket; 13. Gear; 14. Movable plate; 15. Tensioning wheel; 16. Belt; 17. Connecting block; 18. Locking block; 19. Pressure inclined surface; 20. Vertical rod; 21. Spring No. 2. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Please see Figures 1-4 In this embodiment of the present invention, an automatic front safety door mechanical protection lock for a large injection molding machine includes a fixed door 1 with an inlet and outlet. A sliding door 2 is axially slidably installed on the inner wall of the fixed door 1 to close or unclose the inlet and outlet. A drive mechanism for moving the sliding door 2 is installed below the fixed door 1. A locking mechanism extending through to the back end of the fixed door 1 is installed on the front end of the fixed door 1 away from the sliding door 2. An inwardly protruding limiting plate 10 is integrally formed below the back end of the sliding door 2. The limiting plate 10, in conjunction with the locking mechanism, is used to limit the sliding door 2 in the open state.

[0015] In this embodiment: When the injection molding machine is performing injection molding, the sliding door 2 is in a closed state, sealing the entrance and exit of the fixed door 1. After the injection molding is completed, when the injection molding machine opens the mold, it is necessary to take out the product injected by the injection molding machine. At this time, by pressing the open switch, the drive mechanism drives the sliding door 2 to slide open. During the opening process of the sliding door 2, the limit plate 10 moves synchronously until the sliding door 2 is fully open. At this time, the limit plate 10 abuts against the locking mechanism, and the sliding door 2 cannot be closed. At this time, the injection molded product can be taken out, avoiding the installation risk caused by the sliding door 2 closing when taking out the injection molded product. After the injection-molded product is removed, the limiting plate 10 is released by applying a pushing force to the locking mechanism located at the front end of the fixed door 1, thereby releasing the limiting of the sliding door 2.

[0016] Please refer to this carefully. Figure 1 , Figure 3 The drive mechanism includes a forward and reverse motor 3 fixedly installed below the front end of the fixed door 1. Two tensioning wheels 15 are rotatably installed on the lower inner wall of the fixed door 1. The two tensioning wheels 15 are connected by a belt 16. A connecting block 17 is fixedly installed on the upper outer periphery of the belt 16. The bottom end of the connecting block 17 is fixedly connected to the bottom end of the sliding door 2.

[0017] In this embodiment: by starting the forward and reverse motor 3, the forward and reverse motor 3 drives a tension wheel 15 connected to its output end to rotate. The tension wheel 15 drives another tension wheel 15 to rotate synchronously and in the same direction through the belt 16. At this time, the belt 16 can drive the sliding door 2 to slide through the connecting block 17, so as to realize the opening and closing of the sliding door 2.

[0018] Please refer to this carefully. Figure 1 , Figure 2 , Figure 3 and Figure 4 The locking mechanism includes a rack 5 extending from the front end of the fixed door 1 to the back end of the fixed door 1. A connecting plate 6 is fixedly mounted on the front end of the rack 5. A handle 7 is fixedly mounted on the front end of the connecting plate 6 by bolts. A guide shaft 8, welded to the front end of the fixed door 1, is slidably mounted on the end of the connecting plate 6 away from the rack 5. A first spring 9, which is sleeved on the guide shaft 8, abuts against the back end of the connecting plate 6 and the front end of the fixed door 1. The locking mechanism also includes a gear 13 rotatably mounted on the back end of the fixed door 1 via a bracket 12. Wheel 13 meshes with rack 5. A movable plate 14 is coaxially mounted on one end of gear 13. A locking block 18 is slidably mounted on the inner wall of movable plate 14. The bottom end of locking block 18 extends through to the bottom of movable plate 14. A pressure-bearing inclined surface 19 is formed on the side of locking block 18 near the limiting plate 10. A vertical rod 20 that is slidably connected to locking block 18 is vertically fixed on the inner wall of movable plate 14. A second spring 21 that is sleeved with vertical rod 20 is abutted between the top of locking block 18 and the top of the inner wall of movable plate 14.

[0019] In this embodiment: when the sliding door 2 is opened, the sliding door 2 drives the limiting plate 10 to move until the limiting plate 10 contacts and presses against the locking block 18. At this time, the limiting plate 10 applies a pressing force to the pressure inclined surface 19, and the locking block 18 moves upward under the force. The locking block 18 can slide upward along the inner wall of the movable plate 14. The locking block 18 slides upward along the vertical rod 20. At this time, the second spring 21 is compressed until the locking block 18 is misaligned with the limiting plate 10. At this time, the second spring 21 resets and pushes the locking block 18 to reset downward. The reset locking block 18 blocks the limiting plate 10 to prevent the sliding door 2 from automatically closing due to a program error. After the injection molded part is removed, the staff member comes out and pushes the connecting plate 6 towards the front end of the fixed door 1 by the handle 7. The connecting plate 6 pushes the rack 5 to move. When the rack 5 moves, it pushes the gear 13 to rotate. The rotating gear 13 drives the movable plate 14 and the locking block 18 to rotate. When the locking block 18, the movable plate 14 and the limiting plate 10 are misaligned, they will no longer block the closing of the sliding door 2.

[0020] Please refer to this carefully. Figure 1 , Figure 3 and Figure 4 A pressing block 11 is fixedly installed on the back end of the connecting plate 6. A pressing switch 4, which is aligned with the pressing block 11, is installed on the front end of the fixed door 1. Proximity switches for opening and closing the sliding door 2 are installed on both ends of the inner wall of the fixed door 1. The proximity switches, pressing switches 4 and forward and reverse motors 3 are electrically connected.

[0021] In this embodiment: after the card block 18, the movable plate 14 and the limiting plate 10 are misaligned, the pressing block 11 connected with the connecting plate 6 contacts and presses the pressing switch 4. At this time, the pressing switch 4 can control the forward and reverse motor 3 to run, thereby closing the sliding door 2. The design of two proximity switches allows the drive mechanism to stop operating when the sliding door 2 is fully open or closed.

[0022] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A mechanical safety lock for the automatic front safety door of a large injection molding machine, comprising a fixed door (1), characterized in that, The fixed door (1) has an entrance and exit. A sliding door (2) for closing or unclosing the entrance and exit is axially slidably installed on the inner wall of the fixed door (1). A driving mechanism for driving the sliding door (2) to move is installed below the fixed door (1). A locking mechanism that extends through to the back end of the fixed door (1) is installed on the front end of the fixed door (1) away from the sliding door (2). An inwardly protruding limiting plate (10) is integrally formed below the back end of the sliding door (2). The limiting plate (10) cooperates with the locking mechanism to limit the sliding door (2) in the open state.

2. The mechanical protection lock for the automatic front safety door of a large injection molding machine according to claim 1, characterized in that, The driving mechanism includes a forward and reverse motor (3) fixedly installed below the front end of the fixed door (1). Two tensioning wheels (15) are rotatably installed on the lower inner wall of the fixed door (1). The two tensioning wheels (15) are connected by a belt (16). A connecting block (17) is fixedly installed on the upper outer periphery of the belt (16). The bottom end of the connecting block (17) is fixedly connected to the bottom end of the sliding door (2).

3. The mechanical protection lock for the automatic front safety door of a large injection molding machine according to claim 2, characterized in that, The locking mechanism includes a rack (5) extending from the front end of the fixed door (1) to the back end of the fixed door (1). A connecting plate (6) is fixedly installed at the front end of the rack (5). A handle (7) is fixedly installed at the front end of the connecting plate (6) by bolts. A guide shaft (8) welded to the front end of the fixed door (1) is slidably installed at the end of the connecting plate (6) away from the rack (5). A first spring (9) sleeved with the guide shaft (8) is abutted between the back end of the connecting plate (6) and the front end of the fixed door (1).

4. The mechanical protection lock for the automatic front safety door of a large injection molding machine according to claim 3, characterized in that, The locking mechanism also includes a gear (13) rotatably mounted on the back end of the fixed door (1) via a bracket (12). The gear (13) meshes with the rack (5). A movable plate (14) is coaxially mounted on one end of the gear (13). A locking block (18) is slidably mounted on the inner wall of the movable plate (14). The bottom end of the locking block (18) extends through to the bottom of the movable plate (14). A pressure-bearing inclined surface (19) is formed on the side of the locking block (18) near the limiting plate (10).

5. A mechanical safety lock for the automatic front safety door of a large injection molding machine according to claim 4, characterized in that, The inner wall of the movable plate (14) is vertically fixed with a vertical rod (20) that is slidably connected to the locking block (18). A second spring (21) that is sleeved with the vertical rod (20) abuts between the top of the locking block (18) and the top of the inner wall of the movable plate (14).

6. A mechanical safety lock for the automatic front safety door of a large injection molding machine according to claim 4, characterized in that, A pressing block (11) is fixedly installed on the back end of the connecting plate (6). A pressing switch (4) aligned with the pressing block (11) is installed on the front end of the fixed door (1). Proximity switches that sense the opening and closing of the sliding door (2) are installed on both ends of the inner wall of the fixed door (1). The proximity switches, pressing switches (4), and forward and reverse motors (3) are electrically connected.

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