Safety door limiting structure of injection molding machine

Abstract

The utility model relates to the field of manufacturing of injection molding machines, and discloses a safety door limiting structure of an injection molding machine, which comprises a fixed latch hook arranged on a safety door and a rotary latch hook rotationally arranged on a fixed mold side plate through a rotary shaft and meshed with the fixed latch hook, an elastic piece for driving the rotary lock hook and the fixed lock hook to be in an engaged state is arranged on the rotary lock hook, an unlocking assembly is detachably matched with the rotary shaft, and the unlocking assembly comprises a key piece which can penetrate through the fixed mold side plate and is connected with the rotary shaft in an inserted mode to achieve synchronous rotation; according to the limiting structure, the situation that the safety door is opened due to misoperation of other personnel can be avoided, and the operation safety is improved.

Description

Technical Field

[0001] The utility model relates to the field of injection molding machine manufacturing, in particular to a safety door limiting structure of an injection molding machine. Background Art

[0002] Most existing injection molding machines are equipped with a safety door, which is usually located at the front end of the injection molding machine to protect the injection molding machine. In the daily operation of the injection molding machine, the safety door is usually in a closed state, and it must be ensured that it cannot be opened automatically when closed. Therefore, the limit device for maintaining the closed state must be reliable.

[0003] The existing limit devices are divided into electric limit devices and mechanical limit devices. The electric limit devices have the disadvantages of high cost of electrical components, high assembly precision requirements, and transaction damage. The existing mechanical limit devices can refer to the Chinese patent with announcement number CN203716639U, which discloses an anti-retreat door lock for the safety door of an injection molding machine, including a lock seat, a lock core is arranged in the lock seat, the lock core is connected to a handle in a transmission manner, and the handle is connected to a lock mechanism in a transmission manner; the lock mechanism includes two locks, which are connected at opposite ends, and guide inclined surfaces are arranged on the opposite ends of the locks, and one of the lock shafts is connected to the lock seat; the lock shaft is connected to the lock seat and the handle is connected to the lock seat, and a reset spring is arranged between the lock and the lock seat, and a limit mechanism corresponding to the lock core is arranged in the lock seat, and the limit mechanism is a limit block installed on the lock seat.

[0004] The two locks mentioned above can be automatically fastened together under the action of the guiding inclined surface, and the two locks are kept in a locked state by a reset spring, and the two locks can be unlocked by turning the handle. In addition to the operator, the above-mentioned limiting structure can also be unlocked by turning the handle, but there is still a risk of misoperation. Utility Model Content

[0005] The utility model aims at the disadvantage that the existing mechanical limit structure of the safety door can be opened by anyone other than the operator, which leads to the risk of misoperation, and provides a limit structure of the safety door of an injection molding machine which requires a special unlocking tool to be opened.

[0006] In order to solve the above technical problems, the utility model is solved by the following technical solutions:

[0007] A safety door limit structure for an injection molding machine comprises a fixed lock hook arranged on the safety door and a rotating lock hook which is arranged on a fixed mold side plate and can be engaged with the fixed lock hook through a rotating shaft. An elastic member is arranged on the rotating lock hook to drive it to be in an engaged state with the fixed lock hook. An unlocking assembly is detachably fitted on the rotating shaft. The unlocking assembly comprises a key member which can pass through the fixed mold side plate and be plugged into the rotating shaft to realize synchronous rotation.

[0008] By adopting the above scheme, an unlocking component is additionally provided. The unlocking component is a key component that can be plugged into the rotating shaft and realize synchronous rotation. When the fixed lock hook and the rotating lock hook are in an interlocked state under the action of the elastic component, the operator can only use the key to connect with the rotating shaft to drive the rotating lock hook to overcome the elastic force of the elastic component and rotate in the opposite direction to unlock the safety door. Therefore, it can prevent the safety door from being opened due to misoperation by other personnel, thereby increasing the safety of operation.

[0009] Preferably, an unlocking hole through which the rotating shaft can be seen is provided on the fixed mold side plate, a non-circular corner lock core is convexly provided at one end of the rotating shaft near the unlocking hole, and a matching groove for inserting the lock core is recessed at the end of the key piece.

[0010] By adopting the above scheme, after the key is inserted into the unlocking hole, the lock core partially enters the matching groove of the key. Turning the key can drive the rotating shaft to rotate in the opposite direction. The rotating lock hook overcomes the elastic force of the elastic part and unlocks the fixed lock hook. At this time, the safety door and the fixed mold side plate are unlocked.

[0011] Preferably, a matching structure is provided on the fixed mold side plate so that the rotating lock hook can automatically engage with the fixed lock hook when the safety door is fully closed. The matching structure includes guide inclined surfaces provided on the opposite surfaces of the rotating lock hook and the fixed lock hook to guide the engagement of the two, and a limiting component which ensures that when the safety door is fully closed, the maximum downward flipping stroke of the rotating lock hook is driven to a horizontal state to ensure that the two guide inclined surfaces are in a matched state.

[0012] By adopting the above scheme, when the fixed lock hook and the rotating lock hook are facing each other, the matching inclined surface on the fixed lock hook can drive the rotating lock hook to overcome the elastic force of the elastic part and first flip up to make way, and then flip down under the action of the elastic part to achieve automatic engagement with the fixed lock hook. The limiting component can prevent the rotating lock hook from flipping down excessively under the action of the elastic part and being located below the fixed lock hook, thereby ensuring that the automatic locking function can operate normally.

[0013] Preferably, the limiting component is a limiting abutment plate horizontally fixed on the fixed mold side plate, and when the rotating lock hook is flipped down to a horizontal state, the lower end surface of the rotating lock hook abuts and cooperates with the limiting abutment plate.

[0014] Preferably, an assembly structure for improving the smoothness of rotation of the rotating lock hook is provided between the rotating lock hook and the fixed mold side plate, and the assembly structure includes two bearing seats protruding in parallel on the fixed mold side plate and a rotating bearing provided between the bearing seats and the rotating shaft.

[0015] By adopting the above solution, the rotary bearing can drive the rotary shaft to rotate smoothly in both positive and negative directions, thereby ensuring the smoothness of the turning of the rotary lock hook.

[0016] Preferably, the rotating shaft is plugged into the rotating lock hook and an anti-deflection locking mechanism is provided between the two.

[0017] Preferably, the anti-deflection locking mechanism includes a non-circular slot arranged at one end of the rotating lock hook away from its engaging end and an anti-deflection block arranged in the middle of the rotating shaft, the cross-sectional area of ​​which is larger than the rotating shaft and adapted to the slot, and the rotating lock hook and the anti-deflection block are fixedly connected by a set screw.

[0018] By adopting the above scheme, the rotating shaft and the rotating locking hook can be disassembled and assembled, which is convenient for production and processing. At the same time, the replacement of individual parts can be realized, reducing the replacement cost.

[0019] Preferably, the elastic member is a set of torsion springs arranged on the rotating shaft, and a limiting hole 1 and a limiting hole 2 are provided on the side opposite to the bearing seat and the rotating lock hook for partially inserting the two ends of the torsion spring.

[0020] By adopting the above solution, the provision of the torsion spring not only reduces the assembly volume but also can accurately transmit the torque to the rotating lock hook.

[0021] The utility model has significant technical effects due to the adoption of the above technical solutions:

[0022] 1. Add an unlocking component, which is a key component that can be plugged into the rotating shaft and realize synchronous rotation. When the fixed lock hook and the rotating lock hook are in an interlocked state under the action of the elastic component, only the operator can use the key to connect with the rotating shaft to drive the rotating lock hook to overcome the elastic force of the elastic component and rotate in the opposite direction to unlock the safety door. Therefore, it can prevent the safety door from being opened due to misoperation by other personnel, thereby increasing the safety of operation;

[0023] 2. Adding a limiting component can prevent the rotating lock hook from excessively flipping down and being located below the fixed lock hook under the action of the elastic member, thereby ensuring that the automatic locking function can operate normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is an axonometric diagram of an injection molding machine safety door limiting structure in this embodiment and the injection molding machine after being assembled in a limiting state;

[0025] Figure 2 yes Figure 1 A magnified image of A;

[0026] Figure 3 This is a disassembled diagram of a safety door limit structure of an injection molding machine in this embodiment;

[0027] Figure 4 This is an axonometric diagram of a safety door limit structure of an injection molding machine in this embodiment when the limit is released;

[0028] Figure 5 This is an axonometric diagram of a safety door limiting structure of an injection molding machine in the embodiment when it is in the limiting process;

[0029] Figure 6 This is an axonometric diagram of a safety door limit structure of an injection molding machine in this embodiment when it is in a limit position;

[0030] Figure 7 is an axonometric view of the key member of this embodiment when it is inserted into the unlocking hole;

[0031] Figure 8 The isometric view of the key member of this embodiment when it is aligned with the unlocking hole.

[0032] The names of the parts indicated by the numerical labels in the above drawings are as follows: 1. Safety door; 2. Fixed mold side plate; 201. Unlocking hole; 3. Fixed lock hook; 4. Rotating lock hook; 401. Through hole; 402. Slot; 403. Limit hole 2; 5. Torsion spring; 6. Bearing seat; 601. Limit hole 1; 7. Rotating bearing; 8. Anti-deflection block; 9. Set screw; 10. Limiting plate; 11. Rotating shaft; 1101. Lock core; 12. Threaded hole; 13. Guide ramp; 14. Key piece. DETAILED DESCRIPTION

[0033] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0034] Example

[0035] A safety door 1 limit structure for an injection molding machine, referring to Figures 1 to 8 As shown, it includes a fixed lock hook 3 fixedly set on the safety door 1 and a rotating lock hook 4 rotatably set on the fixed mold side plate 2 through a rotating shaft 11 and can be engaged with the fixed lock hook 3. A torsion spring 5 is arranged on the rotating lock hook 4 to drive it to be in an engaged state with the fixed lock hook 3. An assembly structure for improving the smoothness of rotation of the rotating lock hook 4 is arranged between the rotating lock hook 4 and the fixed mold side plate 2. The assembly structure includes two bearing seats 6 convexly arranged in parallel on the fixed mold side plate 2 and a rotating bearing 7 arranged between the bearing seat 6 and the rotating shaft 11. The rotating bearing 7 is a deep groove ball bearing. An annular groove for unidirectional embedding of the rotating bearing 7 is recessed on the opposite side of the bearing seat 6. The torsion spring 5 is sleeved on the rotating shaft 11. A limiting hole 1 601 and a limiting hole 2 403 for partial insertion of the two ends of the torsion spring 5 are arranged on the opposite side of the bearing seat 6 and the rotating lock hook 4.

[0036] The rotating shaft 11 is inserted into the rotating lock hook 4 and an anti-deflection locking mechanism is arranged between the two. Figure 3As shown, the anti-deflection locking mechanism includes a rectangular slot 402 arranged at the end of the rotating lock hook 4 away from the occlusal end and an anti-deflection block 8 arranged in the middle of the rotating shaft 11, the cross-sectional area of ​​which is larger than the rotating shaft 11 and adapted to the slot 402. The rotating lock hook 4 and the anti-deflection block 8 are fixedly connected by a set screw 9. A through hole 401 is arranged on the side wall of the slot 402, and a threaded hole 12 is arranged on the anti-deflection block 8, and the set screw 9 passes through the through hole 401 and is tightly matched with the threaded hole 12.

[0037] A matching structure is provided on the fixed mold side plate 2 so that the rotating lock hook 4 can automatically engage with the fixed lock hook 3 when the safety door 1 is fully closed. The matching structure includes a guide inclined surface 13 provided on the opposite surfaces of the rotating lock hook 4 and the fixed lock hook 3 to guide the engagement of the two, and a limiting component which ensures that when the safety door 1 is fully closed, the maximum downward flipping stroke of the rotating lock hook 4 is driven to be in a horizontal state to ensure that the two guide inclined surfaces 13 are in a matching state. The limiting component is a limiting abutment plate 10 horizontally fixed on the fixed mold side plate 2. When the rotating lock hook 4 flips down to a horizontal state, the lower end surface of the rotating lock hook 4 abuts and cooperates with the limiting abutment plate 10.

[0038] An unlocking assembly is detachably mounted on the rotating shaft 11, and the unlocking assembly includes a key piece 14 that can pass through the fixed mold side plate 2 and be plugged into the rotating shaft 11 to achieve synchronous rotation. An unlocking hole 201 through which the rotating shaft 11 can be seen is provided on the fixed mold side plate 2, and a triangular lock core 1101 is convexly provided at one end of the rotating shaft 11 close to the unlocking hole 201, and a matching groove for the insertion of the triangular lock core 1101 is recessed at the end of the key piece 14.

[0039] During the closing process of safety door 1, Figures 4 to 6 As shown, the rotating lock hook 4 is lifted up by the fixed lock hook 3. When the safety door 1 is fully closed, the rotating lock hook 4 automatically falls down under the action of the torsion spring 5, and the two lock hooks are interlocked, thereby achieving the limit of the safety door 1. In the absence of external action, the torsion spring 5 continues to apply pressure to prevent the rotating lock hook 4 from bouncing up, so that the safety door 1 is always kept in a locked state. The operator needs to use the key 14 to drive the safety door 1 to unlock, thereby significantly reducing the occurrence of the safety door 1 being opened by mistake. This limiting structure adopts a purely mechanical structure, and the limiting effect is reliable. Usually, only the torsion spring needs to be replaced during maintenance, and the maintenance cost is low.

[0040] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A safety door limit structure for an injection molding machine, comprising a fixed lock hook (3) arranged on a safety door (1) and a rotating lock hook (4) rotatably arranged on a fixed mold side plate (2) via a rotating shaft (11) and capable of engaging with the fixed lock hook (3), wherein an elastic member is arranged on the rotating lock hook (4) to drive the rotating lock hook (4) to be in an engaging state with the fixed lock hook (3), characterized in that: An unlocking assembly is detachably mounted on the rotating shaft (11), and the unlocking assembly comprises a key component (14) which can pass through the fixed mold side plate (2) and be plugged into the rotating shaft (11) to realize synchronous rotation.

2. The safety door limit structure of an injection molding machine according to claim 1, characterized in that: An unlocking hole (201) through which the rotating shaft (11) can be seen is provided on the fixed mold side plate (2), a non-circular angle lock core (1101) is protruded at one end of the rotating shaft (11) close to the unlocking hole (201), and a matching groove for the lock core (1101) to be inserted is recessed at the end of the key piece (14).

3. The safety door limit structure of an injection molding machine according to claim 1, characterized in that: A matching structure is provided on the fixed mold side plate (2) so that when the safety door (1) is fully closed, the rotating lock hook (4) can automatically engage with the fixed lock hook (3). The matching structure includes a guide inclined surface (13) provided on the opposite surfaces of the rotating lock hook (4) and the fixed lock hook (3) to guide the engagement of the two, and a limiting component that ensures that when the safety door (1) is fully closed, the maximum downward turning stroke of the rotating lock hook (4) is driven to a horizontal state to ensure that the two guide inclined surfaces (13) are in a matching state.

4. The safety door limit structure of an injection molding machine according to claim 3, characterized in that: The limiting component is a limiting abutment plate (10) fixed horizontally on the fixed mold side plate (2). When the rotating lock hook (4) is turned down to a horizontal state, the lower end surface of the rotating lock hook (4) abuts and cooperates with the limiting abutment plate (10).

5. The safety door limit structure of an injection molding machine according to claim 1, characterized in that: An assembly structure for improving the smoothness of rotation of the rotary lock hook (4) is provided between the rotary lock hook (4) and the fixed mold side plate (2), and the assembly structure comprises two bearing seats (6) protruding in parallel on the fixed mold side plate (2) and a rotary bearing (7) provided between the bearing seats (6) and the rotary shaft (11).

6. The safety door limit structure of an injection molding machine according to claim 5, characterized in that: The rotating shaft (11) is plugged into the rotating lock hook (4) and an anti-deflection locking mechanism is arranged between the two.

7. The safety door limit structure of an injection molding machine according to claim 6, characterized in that: The anti-deflection locking mechanism comprises a non-circular slot (402) arranged at one end of the rotating lock hook (4) away from its occlusal end, and an anti-deflection block (8) arranged in the middle of the rotating shaft (11) and having a cross-sectional area larger than the rotating shaft (11) and adapted to the slot (402); the rotating lock hook (4) and the anti-deflection block (8) are fixedly connected by a set screw (9).

8. The safety door limit structure of an injection molding machine according to claim 5, characterized in that: The elastic member is a set of torsion springs (5) arranged on the rotating shaft (11), and a first limiting hole (601) and a second limiting hole (403) are arranged on the side opposite to the bearing seat (6) and the rotating lock hook (4) for partially inserting the two ends of the torsion spring (5).

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