Injection molding machine safety fence capable of preventing safety door from being opened by mistake

Abstract

The utility model relates to the field of injection molding machines, and discloses an injection molding machine safety fence capable of preventing a safety door from being opened by mistake, which comprises a fence body and a safety door sliding relative to the fence body, and a limiting structure for limiting relative movement of the safety door and the fence body when the safety door is closed is arranged between the safety door and the fence body. The limiting structure comprises a limiting plate fixed to the inner side of the safety door and perpendicular to the safety door and a limiting hook elastically stretching out and drawing back on the fence body, and the limiting hook can cross the limiting plate and limit reverse movement of the limiting plate after being pressed by the limiting plate. An unlocking structure for driving the limiting hook to move away from the safety door to relieve limiting of the limiting plate is arranged on the fence body, when the safety door in the safety fence of the injection molding machine is closed, after the limiting plate and the limiting hook are in extrusion sliding fit, the limiting hook crosses the limiting plate and hooks the limiting plate to limit reverse movement of the limiting plate, and therefore the safety door is prevented from being opened by mistake; when the safety door is opened, only the unlocking structure needs to drive the limiting hook to move away from the safety door to be separated from the limiting plate, and operation is labor-saving and convenient.

Description

Technical Field

[0001] This utility model relates to the field of injection molding machines, and in particular to a safety barrier for injection molding machines that prevents accidental opening of safety doors. Background Technology

[0002] The mold-closing area of ​​the injection molding machine is equipped with a safety barrier. The safety barrier includes a barrier body arranged circumferentially around the mold-closing area and a safety door that moves relative to the barrier body. When the safety door is open, the mold-closing area is exposed; when the safety door is closed, the mold-closing area is blocked. During normal operation of the injection molding machine, due to the potential danger posed by the mechanical movement of the mold-closing area, the safety barrier must be in a closed state to isolate the danger; that is, the safety door must be closed and cannot open automatically.

[0003] However, the mold-closing device involves mold opening and closing actions during its operation cycle, which generates vibration. Excessive vibration may cause the safety door of the injection molding machine to open, creating a safety hazard. Therefore, a limiting structure needs to be installed between the safety door and the enclosure body to prevent the safety door from opening accidentally.

[0004] Chinese Patent Application No. 202220780925.2 discloses an injection molding machine with an anti-opening safety door, including a door panel, a guide rail disposed at the lower end of the door panel and spaced apart from the door panel, a moving member fixed to the door panel and movably disposed relative to the guide rail, and a limiting plate disposed on the guide rail. The limiting plate is provided with a limiting part for limiting and cooperating with the moving member when the door panel moves to the closed position. The limiting part is a limiting groove disposed on the limiting plate. When the door panel moves to the closed position, the guide wheel is embedded in the limiting groove to restrict the rolling of the guide wheel and thus prevent the door panel from leaving the closed position.

[0005] The above solution restricts the guide wheel's rotation by embedding it within a limiting groove. In other words, the limiting groove provides resistance to the guide wheel, preventing accidental opening of the safety door. If the limiting resistance is small, its ability to prevent accidental opening is weak. Therefore, a relatively large limiting resistance is needed to ensure the safety door is not accidentally shaken open. However, a large limiting resistance means that when the safety door actually needs to be opened, the operator needs to apply significant external force to overcome the resistance and allow the guide wheel to slide out of the limiting groove and release the limiting force. That is, while the above solution prevents accidental opening of the safety door, it also makes the safety door more difficult to open when it is actually needed. Utility Model Content

[0006] This invention addresses the drawback of existing technologies that, while preventing accidental opening of safety doors, also make them difficult to open when actually needed. It provides a safety barrier for injection molding machines that prevents accidental opening of safety doors.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0008] A safety barrier for an injection molding machine with a safety door to prevent accidental opening includes a barrier body and a safety door that slides relative to the barrier body to expose or block the mold closing area. A limiting structure is provided between the safety door and the barrier body to restrict the relative movement of the two when the safety door is closed. The limiting structure includes a limiting plate fixed to the inside of the safety door and perpendicular to the safety door, and a limiting hook that is elastically telescopically disposed on the barrier body and can pass over the limiting plate after being pressed by the limiting plate and restricting the limiting plate from moving in the opposite direction. An unlocking structure is provided on the barrier body to drive the limiting hook away from the safety door to release the limiting plate.

[0009] Using the above scheme, during the closing process of the safety door, after the limit plate and the limit hook come into contact, their squeezing and sliding action drives the limit hook to move elastically away from the safety door. After the limit hook passes the limit plate, it moves elastically back to its original position near the safety door and hooks the limit plate. Since the movement direction of the limit hook is perpendicular to the movement direction of the safety door, that is, the limit hook will not move along the movement direction of the safety door, the limiting resistance of the limit hook on the limit plate is sufficient to restrict the reverse movement of the limit plate, thereby limiting the accidental opening of the safety door. During unlocking, the unlocking structure drives the limit hook to move away from the safety door, which only requires overcoming the friction between the limit hook and the limit plate and the elastic force of the limit hook's own elastic extension and contraction. Compared with the existing technology, which requires overcoming the limiting resistance, this significantly reduces the force required, thus preventing accidental opening of the safety door and making it easier to open when it is actually needed.

[0010] Preferably, the limiting hook and / or the limiting plate are provided with a guide slope or guide arc surface to facilitate the limiting hook passing over the limiting plate.

[0011] By adopting the above scheme, the setting of the guide slope or guide arc surface ensures that when the limit hook and the limit plate are squeezed together, the limit hook can slide away from the safety door under the squeezing force to pass over the limit plate.

[0012] Preferably, the unlocking structure includes a button that is telescopically mounted on the outside of the enclosure body along the moving direction of the limit hook, and a connecting rod at both ends that is fixedly connected to the button and the limit hook respectively.

[0013] Using the above solution, when unlocking, simply press the button on the outside of the enclosure body to retract it. This will cause the limit hook to move away from the safety door and inward through the connecting rod until the limit hook is completely disengaged from the limit plate. Once the resistance from the limit hook on the limit plate disappears, the safety door can be easily pushed open.

[0014] Preferably, the inner side of the enclosure body is fixedly provided with a mounting seat for guiding the sliding of the limit hook, and a mounting ring is protruding on the outer ring wall of the connecting rod. A spring is provided between the mounting ring and the mounting seat along the axial direction of the connecting rod. When the spring is in its initial state, the hook tip of the limit hook is located between the end of the limit plate away from the safety door and the safety door.

[0015] Using the above scheme, the elastic extension and retraction of the limit hook is achieved by a spring installed between the mounting base and the mounting ring. When the limit hook and the limit plate slide and move away from the safety door, the mounting ring moves closer to the mounting base. The spring is compressed and deformed to generate elastic force. When the limit hook passes the limit plate, the squeezing force from the limit plate on the limit hook disappears. Under the action of the spring's return elastic force, it moves closer to the safety door and resets. Since the hook tip of the limit hook is located between the end of the limit plate away from the safety door and the safety door, the limit plate is limited.

[0016] Preferably, a sleeve is fixedly installed on the fence body to guide the sliding of the installation ring.

[0017] The above solution increases the stability of the linear movement of the button, connecting rod, and limit hook guide.

[0018] Preferably, an automatic pop-up structure is provided between the enclosure body and the safety door, which drives the safety door to open automatically when the limit hook moves to the point of disengagement from the limit plate and unlocks.

[0019] Using the above solution, after the unlocking mechanism is unlocked, the limiting resistance on the limit plate disappears, and the safety door can be opened under the action of the automatic pop-out mechanism, allowing the limit plate to move away from the limit hook. At this point, releasing the unlocking mechanism will no longer limit the safety door, and the safety door can be opened directly.

[0020] Preferably, the automatic pop-out structure includes an abutment plate fixed to the inside of the safety door and perpendicular to the safety door, and a top rod that is elastically telescopically mounted on the enclosure body along the moving direction of the safety door and elastically retracts after being pressed by the abutment plate when the safety door is closed.

[0021] Using the above scheme, when the safety door is closed, the push rod abuts against the abutment plate and is in an elastic retracted state. Due to the limiting effect of the limit hook on the limit plate, the safety door is prevented from opening. That is, the push rod also maintains an elastic retracted state under the limiting resistance of the limit hook. When the limiting resistance from the limit hook on the limit plate disappears, the resistance on the push rod also disappears, and the push rod pops out, causing the abutment plate to automatically spring away from the limit hook.

[0022] This utility model, by adopting the above technical solution, has significant technical effects: During the closing process of the safety door, after the limiting plate abuts against the limiting hook, it squeezes the limiting hook, driving it to move inward away from the safety door. After the limiting hook passes the limiting plate, it moves elastically back to the safety door to restrict the reverse movement of the limiting plate, thus restricting the opening of the safety door. The push rod remains in an elastic retracted state under the pressure of the abutment plate. When the safety door needs to be opened, press the button on the outside of the enclosure body to drive the limiting hook away from the safety door until it disengages from the limiting plate, releasing the limitation on the limiting plate. The push rod pops out, driving the abutment plate to move in the opposite direction. The operator releases the button, and the limiting hook and button reset. At this time, since the safety door has been opened by the push rod and the limiting plate has moved away from the limiting hook, the reset of the limiting hook will no longer limit the safety door. The operator can directly pull open the safety door, thus preventing accidental opening of the safety door and making it easier to open when it is actually needed. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a safety barrier for an injection molding machine with a safety door to prevent accidental opening, as described in the embodiment.

[0024] Figure 2 yes Figure 1 Enlarged view of point A in the image;

[0025] Figure 3 This is a front view of a safety barrier for an injection molding machine with a safety door designed to prevent accidental opening, as described in the embodiment.

[0026] Figure 4 yes Figure 3 Sectional view at point BB in the middle;

[0027] Figure 5 yes Figure 4 Enlarged view of point C in the image;

[0028] Figure 6 This is a partial enlarged view of the unlocking structure in the injection molding machine safety enclosure for preventing accidental opening of a safety door, as described in the embodiment, during the unlocking process.

[0029] Figure 7 This is a magnified view of a portion of the safety gate in an injection molding machine safety enclosure designed to prevent accidental opening of the safety gate in the embodiment, showing the door moving to the point where the limiting plate and the limiting hook are engaged during the closing process;

[0030] Figure 8 This is a magnified view of a portion of the safety gate in an injection molding machine safety enclosure designed to prevent accidental opening, during the closing process, when the safety gate moves to the limit plate and the limit hook engage in a squeezing and sliding cooperation.

[0031] Figure 9 This is an exploded view of the limiting structure in the safety enclosure of an injection molding machine, which is designed to prevent accidental opening of a safety door, according to one embodiment.

[0032] The parts referred to by the numbers in the above attached diagrams are as follows: 1. Fence body; 2. Safety door; 3. Limiting plate; 4. Guide ramp; 5. Limiting hook; 6. Guide arc surface; 7. Button; 8. Connecting rod; 10. Mounting base; 11. Clearance guide groove; 12. Mounting ring; 13. Spring; 14. Sleeve; 15. Guide cylinder; 16. Top rod; 17. Fixing plate; 18. Mounting plate; 19. Abutment plate. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0034] Example

[0035] A safety barrier for injection molding machines with a safety door to prevent accidental opening, as shown in the reference. Figures 1 to 9 The enclosure includes a barrier body 1 arranged circumferentially around the mold closing area and a safety door 2 that moves relative to the barrier body 1. When the safety door 2 is open, the mold closing area is exposed; when the safety door 2 is closed, it blocks the mold closing area. A limit structure is provided between the safety door 2 and the barrier body 1. When the safety door 2 is closed, the limit structure can prevent the safety door 2 from being opened accidentally.

[0036] The limiting structure includes a limiting plate 3 fixed to the inside of the safety door 2 and perpendicular to the safety door 2, and a limiting hook 5 elastically extending and retracting on the inside of the enclosure body 1 in a direction perpendicular to the inside of the safety door 2. During the closing process of the safety door 2, the limiting hook 5 is pressed by the limiting plate 3, and can cooperate with the limiting plate 3 to make the limiting hook 5 move elastically away from the safety door 2. After passing the limiting plate 3, it moves closer to the safety door 2 to reset and restrict the limiting plate 3 from moving in the opposite direction. A mounting plate 18 is fixedly installed on the inside of the enclosure body 1, and a mounting base 10 is fixedly installed on the mounting plate 18. The mounting base 10 is provided with an avoidance guide groove 11 for one end of the limiting hook 5 to be inserted and guided to move in a direction perpendicular to the inside of the safety door 2.

[0037] The side of the limiting plate 3 closest to the mounting base 10 is provided as a guide slope 4, and the guide slope 4 gradually tilts away from the mounting base 10 from the side closest to the safety door 2 to the side furthest from the safety door 2. The side of the limiting hook 5 furthest from the mounting base 10 is provided as a guide arc surface 6, and the guide arc surface 6 and the guide slope 4 squeeze and slide to drive the limiting hook 5 away from the safety door 2.

[0038] An unlocking mechanism is provided on the enclosure body 1, which can drive the limit hook 5 away from the safety gate 2 to release the restriction on the limit plate 3. The unlocking mechanism includes a button 7 that is telescopically mounted on the outside of the enclosure body 1 along the moving direction of the limit hook 5. A connecting rod 8 is concentrically fixed on the button 7. The end of the connecting rod 8 away from the button 7 is fixedly connected to the end of the limit hook 5 embedded in the mounting base 10. The limit hook 5 and the connecting rod 8 are fixedly connected by bolts. Bolts are existing technology and are not shown in the figure, so they will not be described in detail here.

[0039] A mounting ring 12 is formed by a vertically protruding ring on the outer ring wall of the connecting rod 8. A spring 13 is sleeved on the connecting rod 8. The two ends of the spring 13 are fixedly connected to or abut against the mounting ring 12 and the mounting seat 10 on opposite sides, respectively. In this embodiment, a fixed connection is used. When the spring 13 is in its initial state, the button 7 is in the extended state, and the hook tip of the limiting hook 5 is located between the side of the limiting plate 3 away from the safety door 2 and the inner side of the safety door 2. This ensures that when the limiting hook 5 moves and resets near the safety door 2 after passing the limiting plate 3, it can limit the movement of the limiting plate 3. A sleeve 14 is fixedly provided on the enclosure body 1 to guide the sliding of the mounting ring 12.

[0040] The operator has to press button 7 with one hand to keep the limit hook 5 unlocked, while using the other hand to push open the safety door 2, which is inconvenient and difficult to apply force. Therefore, an automatic pop-up structure is provided between the enclosure body 1 and the safety door 2. When the limit hook 5 moves away from the safety door 2 and disengages from the limit plate 3 to unlock, it can drive the safety door 2 to open automatically. The automatic pop-up structure includes a guide cylinder 15 fixed to the inside of the enclosure body 1, with the axis of the guide cylinder 15 parallel to the direction of movement of the safety door 2. A push rod 16 is elastically telescopically provided inside the guide cylinder 15 along its axis, and in the normal state, the push rod 16 partially extends out of the guide cylinder 15. An abutment plate 19 is fixedly provided inside the safety door 2 below the limit plate 3, and the abutment plate 19 is perpendicular to the inside of the safety door 2. During the closing process of the safety door 2, the abutment plate 19 presses the push rod 16, causing it to elastically retract into the guide cylinder 15. In this embodiment, a fixing plate 17 is fixedly installed on the inner side of the safety door 2. The side of the fixing plate 17 near the mounting base 10 is bent inward to form a limiting plate 3 and an abutment plate 19.

[0041] During the closing process of safety door 2, the guide slope 4 of limit plate 3 first abuts against the guide arc surface 6 of limit hook 5, as shown in the figure. Figure 7 Subsequently, the two forces squeeze and slide, causing the limit hook 5 to move away from the safety door 2 along the direction perpendicular to the inside of the safety door 2. The spring 13 is compressed and generates a restoring force. (Refer to...) Figure 8 Finally, after the limit hook 5 passes the limit plate 3, it moves closer to the safety door 2 and resets under the return force of the spring 13, restricting the reverse movement of the limit plate 3, thereby preventing the safety door 2 from opening accidentally. (Refer to...) Figure 5 Meanwhile, during the closing process of the aforementioned safety door 2, the abutment plate 19 abuts against the push rod 16 and drives the push rod 16 to elastically retract into the guide cylinder 15.

[0042] When safety door 2 needs to be opened, the operator presses button 7 to retract it. This retraction, via connecting rod 8, moves limit hook 5 away from safety door 2 until limit hook 5 disengages from limit plate 3. Spring 13 then compresses, generating a restoring force. (Refer to...) Figure 6Since the limiting plate 3, the abutment plate 19, and the safety door 2 are fixedly installed, the limiting resistance from the limiting hook 5 on the limiting plate 3, the abutment plate 19, and the safety door 2 disappears, and the push rod 16 pops out and resets, causing the safety door 2 to automatically open. At this time, the operator releases the button 7, which extends and resets under the force of the spring 13. Since the safety door 2 has been popped open by the push rod 16, the limiting plate 3 is now away from the limiting hook 5, and the resetting of the limiting hook 5 will no longer limit the safety door 2. The operator can then directly pull open the safety door 2.

[0043] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A safety barrier for an injection molding machine with a safety door to prevent accidental opening, comprising a barrier body (1) and a safety door (2) that slides relative to the barrier body (1) to expose or block the mold closing area, wherein a limiting structure is provided between the safety door (2) and the barrier body (1) to restrict relative movement between the two when the safety door (2) is closed, characterized in that: The limiting structure includes a limiting plate (3) fixed to the inside of the safety door (2) and perpendicular to the safety door (2), and a limiting hook (5) elastically telescopically disposed on the enclosure body (1) and able to pass over the limiting plate (3) after being pressed by the limiting plate (3) and restricting the limiting plate (3) from moving in the opposite direction. An unlocking structure is provided on the enclosure body (1) to drive the limiting hook (5) away from the safety door (2) to release the limitation on the limiting plate (3).

2. The injection molding machine safety enclosure with a safety door to prevent accidental opening as described in claim 1, characterized in that: The limiting hook (5) and / or the limiting plate (3) are provided with a guide slope (4) or guide arc surface (6) to facilitate the limiting hook (5) to pass over the limiting plate (3).

3. The injection molding machine safety enclosure with a safety door to prevent accidental opening as described in claim 1, characterized in that: The unlocking structure includes a button (7) that is telescopically mounted on the outside of the enclosure body (1) along the moving direction of the limit hook (5) and a connecting rod (8) that is fixedly connected at both ends to the button (7) and the limit hook (5) respectively.

4. A safety barrier for an injection molding machine with a safety door to prevent accidental opening, as described in claim 3, is characterized in that: The inner side of the enclosure body (1) is fixedly provided with a mounting seat (10) for guiding the sliding of the limiting hook (5). A mounting ring (12) is protruding on the outer ring wall of the connecting rod (8). A spring (13) is provided between the mounting ring (12) and the mounting seat (10) along the axial direction of the connecting rod (8). When the spring (13) is in the initial state, the hook tip of the limiting hook (5) is located between the end of the limiting plate (3) away from the safety door (2) and the safety door (2).

5. A safety barrier for an injection molding machine with a safety door to prevent accidental opening, as described in claim 4, characterized in that: A sleeve (14) is fixedly installed on the main body (1) for guiding the sliding of the installation ring (12).

6. A safety barrier for an injection molding machine with a safety door to prevent accidental opening, as described in claim 1, characterized in that: An automatic pop-up structure is provided between the enclosure body (1) and the safety door (2) to drive the safety door (2) to open automatically when the limit hook (5) moves to the point of disengaging from the limit plate (3) and unlocking.

7. A safety barrier for an injection molding machine with a safety door to prevent accidental opening, as described in claim 6, characterized in that: The automatic pop-out structure includes an abutment plate (19) fixed to the inside of the safety door (2) and perpendicular to the safety door (2), and a top rod (16) elastically telescopically mounted on the enclosure body (1) along the moving direction of the safety door (2) and elastically retracting after being pressed by the abutment plate (19) when the safety door (2) is closed.

Images