Mechanical safety device of injection molding machine

Abstract

The invention relates to the technical field of injection molding machine accessories, and discloses a mechanical safety device of an injection molding machine, the mechanical safety device comprises a mounting block, a safety block, a traction assembly and a safety rod fixed to a movable mold plate, a plurality of one-way limiting grooves are distributed in the safety rod at intervals, and the traction assembly comprises a deflector rod rotationally arranged relative to a machine body and a brake cable connecting the deflector rod and the safety block; the safety device further comprises a limiting keeping mechanism, the limiting keeping mechanism comprises a matching block and a limiting piece, the matching block enables the shifting rod to turn upwards to the maximum stroke and then fall back to the preset stroke, the limiting piece stretches out and draws back in the installation block, and a connecting rod assembly is arranged between the shifting rod and the limiting piece. When the injection molding machine is closed, the deflector rod drives the limiting piece to elastically abut against the safety block through the connecting rod assembly, and when the safety block is turned upwards to the limit, the limiting piece automatically bounces into the limiting inserting groove, the limiting keeping mechanism in the scheme can enable the safety block to keep a state of being separated from the limiting groove after the injection molding machine is closed, and meanwhile the brake cable is in a relaxed state and is not tensioned for a long time; and the service life of the brake cable can be prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding machine accessories, in particular to a mechanical fuse of an injection molding machine. Background Art

[0002] The mechanical insurance is a safety protection device on the injection molding machine. When the sliding door of the injection molding machine is in the open state, the mechanical insurance can limit the moving platen of the injection molding machine from approaching the head plate to perform the mold closing action, so as to protect the safety of the operator or maintenance personnel. The existing mechanical insurance structure can refer to the content disclosed in the Chinese patent with the announcement number CN203945626U, which is named as a mechanical insurance device of an injection molding machine, including a insurance rod and a insurance block. One end of the insurance rod is fixedly connected to the moving platen, and a plurality of limit grooves are arranged on the insurance rod at intervals. The insurance block can move up and down to cooperate with or disengage from the limit grooves. A brake line is connected to the insurance block, and the other end of the brake line is connected to the driving component on the sliding door of the injection molding machine. When the sliding door is closed, the brake line is driven by the movement of the sliding door to tension the brake line and pull the insurance block When the moving template is disengaged from the one-way limit groove, it can be ensured that the safety bar is not hindered when the moving template moves. When the sliding door is opened, the brake line is relaxed, and the safety block falls into the limit groove due to its own gravity. A stopper is formed on the tail plate of the injection molding machine, which can cooperate with the safety block to brake the safety bar. The above-mentioned limit groove is a one-way limit groove, and the limit groove is inclined to one side of the moving template and is provided with an oblique cut. When the safety block is in the limit groove, the moving template is molded, and the safety block will be against the upper limit of the stopper to brake the template forward. If the moving template makes a retreat movement away from the head plate at this time, the inclined surface of the oblique cut will drive the safety block to rise, and when it retreats to align with the next limit groove, the safety block falls and cooperates with the limit groove to play the role of one-way limit, preventing the moving template from being molded when the sliding door of the injection molding machine is opened, and at the same time does not limit the retreat of the moving template.

[0003] It can be known from the above structure that the above mechanical safety device controls the tensioning of the brake wire to lift the safety block or relaxes it to lower the safety block through the opening and closing of the sliding door. The structure is simple and effective. However, when the sliding door of the injection molding machine is closed, the brake wire is always in a tensioned state when lifting the safety block. After long-term use, the brake wire is prone to loosening and aging, resulting in the safety block failing to completely detach from the one-way limit groove after the sliding door is closed, which will affect the mold closing action of the injection molding machine. Therefore, there is room for improvement in the existing mechanical safety structure of the injection molding machine. Summary of the invention

[0004] In view of the disadvantage that when the existing injection molding machine is in the closed state, the pulling component on the mechanical safety is always in a tensioned state, and is easily loosened and aged after long-term use, leading to failure, the purpose of the present invention is to provide an injection molding machine mechanical safety that can extend the service life of the pulling component.

[0005] In order to solve the above technical problems, the present invention is solved by the following technical solutions: A mechanical safety of an injection molding machine, comprising a safety block which is lifted or hinged on a mounting block and the mounting block is fixed on a tail plate, a pulling assembly which drives the safety block to lift or flip, and a safety rod which is horizontally fixed on a movable platen and moves synchronously with the movable platen, and a plurality of one-way limiting grooves are distributed on the safety rod along its axial direction at intervals for limiting the movable platen from moving along the mold closing direction when the safety block is embedded; The pulling assembly includes a fixed mounting seat, a lever hinged on the mounting seat, and a brake line connected to the safety block and the lever at both ends. The movement of the lever is controlled by the opening and closing of the sliding door. When the sliding door is closed, the lever flips up, the brake line is tightened and pulls the safety block out of the one-way limit groove. A limit holding mechanism is arranged between the mounting block, the lever and the sliding door, which keeps the safety block in a disengaged state from the one-way limit slot and keeps the brake line in a relaxed state when the sliding door is closed to the maximum stroke. The limit holding mechanism includes a matching block arranged on the sliding door and forces the lever to flip upward to the maximum stroke and then fall back to the preset stroke as the sliding door is closed, a limit slot arranged on the safety block, and a limit piece that elastically expands and contracts horizontally in the mounting block and contracts in the mounting block in normal state. A connecting rod assembly is arranged between the limit piece and the lever. When the lever is flipped up, the limit piece is elastically pressed against the outer wall of the safety block by the top pressure of the connecting rod assembly; when the lever is flipped up to the maximum stroke, the limit slot is aligned with the limit piece and the limit piece is partially inserted into the limit slot; when the lever falls back to the preset stroke, the top pressure of the connecting rod assembly on the limit piece is reduced but it is still in a plug-in state with the limit slot; when the lever is retracted to the minimum stroke, the limit piece returns to normal and disengages from the limit slot.

[0006] When the above scheme is adopted, when the sliding door of the injection molding machine is closed, the matching block will drive the lever to flip up to the maximum stroke and then fall back to the preset stroke. When it flips up to the maximum stroke, the brake line will be tensioned and pull the safety block to rise or flip up. At the same time, the lever can drive the limit piece to cooperate with the safety block through the connecting rod assembly. The limit piece will first be pressed against the outer wall of the safety block. As the lever rotates, the limit piece is elastically compressed by the pressure of the connecting rod assembly. When the safety block is pulled up to the maximum stroke and the limit slot is aligned with the limit piece, the limit piece will be elastically inserted into the limit slot; when the lever falls back to the preset stroke, the lever will flip down a certain angle, causing the brake line to retreat a part of the stroke, and the connecting rod will also The brake line is not in a tensioned state for a long time, which can effectively extend the service life of the brake line and reduce the later maintenance cost of the mechanical insurance of the injection molding machine. Moreover, no additional operation steps are required to realize the step of loosening the brake line, and the sliding door only needs to be closed normally. Therefore, the structural change of this scheme will not change the operator's usage habits, will not increase the difficulty of operation, and is more convenient.

[0007] Preferably, the mating block includes an inclined guide plate that is inclined and can force the lever to flip up, a horizontal guide plate extending from the top of the inclined guide plate, and a retraction structure located near the inclined guide plate on the horizontal guide plate for allowing the lever to fall back from a maximum stroke to a preset stroke.

[0008] Preferably, the retraction structure includes a groove recessed on the horizontal guide plate, a slope formed on the side of the groove close to the inclined guide plate to facilitate the lever to disengage from the groove, and a guide wheel is provided on the lever to roll with the horizontal guide plate, the inclined guide plate, the groove and the slope.

[0009] When the above scheme is adopted, when the door of the injection molding machine is opened, the lever first contacts the lowest point of the inclined guide plate. As the sliding door is closed, the inclined guide plate presses against the lever to force it to gradually turn up. When the contact point between the two is at the top of the inclined guide plate, the lever runs to the maximum stroke. At this time, the limit piece has cooperated with the limit slot to limit the safety block from turning down. When the sliding door is closed continuously, the lever can fall into the groove through the inclined surface. When the lever contacts the bottom of the groove, it is at the position of the preset stroke. At this time, the brake line has retreated a part of the stroke and is in a relaxed state, and the connecting rod structure keeps holding the limit piece to limit the safety block from turning down or descending. This solution utilizes a guide wheel to replace the lever body in contact with the matching block, reducing friction by rolling friction, which helps the roller to withdraw from the groove to the inclined guide plate when the sliding door is opened.

[0010] Preferably, the retraction stroke of the brake line does not exceed 20% of the total stroke of the brake line pulling the safety block.

[0011] The above scheme is adopted. This scheme limits the maximum retraction stroke of the brake line, with the purpose of reducing the degree of bending of the brake line after excessive retraction. This limitation prevents the brake line from interfering with other components on the injection molding machine after relaxation. Considering that the brake line has a certain elastic deformation capacity, it may be in a state of elastic elongation when pulling the safety block. In actual production, the minimum retraction stroke of the brake line should be considered based on the deformation amount of its own elastic elongation. Therefore, the actual retraction stroke of the brake line should be greater than the deformation amount of its own elastic elongation, but less than 20% of its total stroke, so that the brake line can be fully relaxed after retraction without interfering with other components.

[0012] Preferably, when the lever retracts to a preset stroke, the angle between it and the horizontal guide plate is less than 45°, and the angle between the inclined surface and the bottom of the groove is greater than 135°.

[0013] The above scheme is adopted, and the purpose of this scheme is to reduce the probability of the lever getting stuck in the groove. During the opening process of the sliding door, the matching block retreats with the sliding door. At this time, the force of opening the door acts on the guide wheel through the abutment of the inclined surface, which will generate upward and backward components of force. By limiting the angle between the lever and the horizontal guide plate and the angle between the inclined surface and the bottom of the groove within the above range, the angle between the lever and the inclined surface can exceed 90° and the opening is always facing upward. In this state, the upward component of force is always greater than the backward component of force, which is conducive to the guide wheel withdrawing from the groove to the top of the inclined guide plate, and can effectively reduce the probability of the guide wheel getting stuck in the groove.

[0014] Preferably, the limiting member comprises a sleeve which is telescopically arranged in a guiding manner in the mounting block and a limiting pin which is elastically telescopically arranged in the sleeve, and one end of the sleeve away from the limiting pin forms a connecting block which cooperates with the connecting rod assembly.

[0015] Preferably, the connecting rod assembly includes a rotating rod coaxially arranged on the shift rod and extending toward the mounting block, a first connecting rod fixedly arranged on the rotating rod, and a second connecting rod hingedly connected to the first connecting rod and the connecting block at both ends.

[0016] By adopting the above scheme, when the connecting rod assembly pushes the sleeve close to the safety block, the limit pin will first abut against the safety block and then elastically retract into the sleeve. When the safety block rises to the maximum stroke, the limit pin will automatically pop out and partially insert into the limit slot when it is aligned with the limit slot. When the second connecting rod follows the lever to retreat, the limit pin still maintains an elastic abutment state with the safety block, limiting its movement.

[0017] Preferably, a damping component is provided between the mounting seat and the lever to increase the resistance of the lever when it cooperates with the groove. The damping component includes a torsion spring capable of driving the lever to flip downward. Both ends of the torsion spring are fixed relative to the mounting seat and the lever respectively.

[0018] By adopting the above scheme, the torsion spring can increase the resistance of the guide wheel to exit the groove along the inclined surface. This resistance forms a combined force with the pulling force of the brake line pulled by the deadweight of the safety block, thereby increasing the initial force required to open the sliding door. When the operator needs to open the sliding door, this combined force must be overcome. This structure can be used as a sliding door pre-tightening structure of an injection molding machine, eliminating the step of setting a pre-tightening structure on the sliding door of the injection molding machine, and reducing the number of parts and assembly steps.

[0019] Preferably, the brake line is provided with a mounting structure for stabilizing both ends of the brake line on the tail plate and the fuselage respectively.

[0020] Preferably, the mounting structure includes a sleeve disposed outside the brake line, and fastening structures disposed at both ends of the sleeve, and mounting positions for mounting the fastening structure are respectively disposed on the tail plate and the fuselage.

[0021] The present invention has significant technical effects due to the adoption of the above technical scheme: the limit holding mechanism in the scheme enables the injection molding machine to achieve the effect that the safety block can still remain out of the one-way limit groove after the brake line is released in the closed state, so that the brake line is no longer in a tensioned state for a long time, which can effectively extend the service life of the brake line and reduce the later maintenance cost of the mechanical insurance of the injection molding machine; and when realizing the step of releasing the brake line, there is no need to add additional operating steps, only the sliding door needs to be closed normally. Therefore, the structural changes in the scheme will not change the operator's usage habits, will not increase the difficulty of operation, and is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the external structure of a mechanical insurance of an injection molding machine according to this embodiment; Figure 2 yes Figure 1 A partial enlarged view of A; Figure 3 yes Figure 2 Figure A1 shows the state change after splitting; Figure 4 It is a rear view of a mechanical insurance of an injection molding machine in this embodiment; Figure 5 yes Figure 4 The cross-sectional view of BB; Figure 6 yes Figure 5 The partial enlarged view of C in the figure is a schematic diagram of the injection molding machine sliding door in an open state; Figure 7 yes Figure 6 Schematic diagram C1 of the state of the sliding door of the injection molding machine during closing; Figure 8 yes Figure 6 Schematic diagram C2 of the state of the injection molding machine after the sliding door is closed.

[0023] The names of the parts indicated by the numerical labels in the above drawings are as follows: 1. Fuselage; 2. Tail plate; 3. Moving plate; 4. Head plate; 5. Mounting block; 6. Safety block; 7. Safety rod; 8. One-way limit groove; 9. Mounting seat; 10. Push rod; 11. Brake line; 13. Limit slot; 14. Oblique guide plate; 15. Horizontal guide plate; 16. Groove; 17. Inclined surface; 18. Guide wheel; 19. Sleeve; 20. Limit pin; 21. Spring; 22. Connecting block; 23. Rotating rod; 24. First connecting rod; 25. Second connecting rod; 26. Torsion spring; 27. Sleeve; 28. Fastening structure; 29. ​​Mounting position; 30. Limit plate; 31. Connecting plate. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. Example

[0025] A mechanical insurance for an injection molding machine, according to Figure 1 , 2 As shown, it includes a safety rod 7 which is horizontally fixed on the movable template 3 and can move synchronously with the movable template 3. A plurality of one-way limiting grooves 8 are distributed along the axial direction of the safety rod 7 to limit the movement of the movable template 3 along the mold closing direction when the safety block 6 is embedded. A mounting block 5 is fixedly provided on the tail plate 2, and a safety block 6 is lifted or hingedly provided on the mounting block 5. In this embodiment, the safety block 6 is hinged to the mounting block 5, and a pulling component is provided on the safety block 6 to drive the safety block 6 to lift or flip. Figure 2 , 3 As shown, the pulling assembly includes a fixed mounting seat 9, a lever 10 is hingedly provided on the mounting seat 9, a brake line 11 is connected to the end of the lever 10, and the other end of the brake line 11 is connected to the safety block 6. In this embodiment, a sleeve 27 is provided on the outer sleeve of the brake line 11, and fastening structures 28 are provided at both ends of the sleeve 27. The tail plate 2 and the fuselage 1 are respectively provided with mounting positions 29 for installing the fastening structure 28; The movement of the lever 10 is controlled by the opening and closing of the sliding door. When the sliding door is closed, the lever 10 flips up, the brake line 11 is tightened and pulls the safety block 6 out of the one-way limit groove 8. When the sliding door is opened, the lever 10 flips down, the brake line 11 is relaxed, and then the safety block 6 falls into the limit groove by its own weight. At this time, if the movable mold plate 3 is closed, the safety block 6 will be against the mounting block 5 to brake the safety rod 7. The above is the prior art and will not be repeated in this embodiment.

[0026] The improvement of this embodiment is that a matching block is fixedly arranged on the sliding door to force the lever 10 to flip upward to the maximum stroke and then fall back to the preset stroke as the sliding door is closed. Figure 2 , 3As shown, the matching block includes an inclined guide plate 14 which is arranged obliquely, and the inclined guide plate 14 can resist the lever 10 and force it to turn up. A horizontal guide plate 15 is extended from the top of the inclined guide plate 14. In this embodiment, a connecting plate 31 is formed on the side wall surface of the horizontal guide plate 15 and the inclined guide plate 14. The connecting plate 31 is fixedly connected to the sliding door of the injection molding machine, so as to realize the synchronous movement of the matching block and the sliding door. A retraction structure is arranged at the horizontal guide plate 15 near the inclined guide plate 14. Figures 6-8 As shown, the retraction structure includes a groove 16 recessed on the horizontal guide plate 15, and the retraction stroke of the brake line 11 does not exceed 20% of the total stroke of the brake line 11 pulling the safety block 6. In this embodiment, the retraction stroke of the brake line 11 accounts for approximately 15% of the total stroke of pulling the safety block 6. A slope 17 is formed on the side of the groove 16 close to the inclined guide plate 14 to facilitate the lever 10 to disengage from the groove 16. When the lever 10 retracts to a preset stroke, the angle between it and the horizontal guide plate 15 is less than 45°, and the angle between the slope 17 and the bottom of the groove 16 is greater than 135°. The lever 10 is provided with a guide wheel 18 that rolls with the horizontal guide plate 15, the inclined guide plate 14, the groove 16 and the slope 17.

[0027] A torsion spring 26 is provided between the mounting seat 9 and the lever 10 to increase the resistance of the lever 10 when it cooperates with the groove 16 , and two ends of the torsion spring 26 are fixed relative to the mounting seat 9 and the lever 10 , respectively.

[0028] The horizontal elastic expansion and contraction limiter in the mounting block 5 is arranged according to Figures 6-8 As shown, the limiting member includes a sleeve 19 which is guided and telescopically arranged in the mounting block 5, and a limiting pin 20 which is elastically telescopically arranged in the sleeve 19. In this embodiment, a spring 21 is arranged between the limiting pin 20 and the sleeve 19 to drive the limiting pin 20 to elastically telescope relative to the sleeve 19. Figure 2 , 6 As shown, in this embodiment, a limit plate 30 for limiting the lateral movement of the safety block 6 is formed on the mounting block 5, and a bolt is penetrated on the safety block 6. After the bolt passes through the limit plate 30, the mounting block 5 is fixed to realize the hinge of the safety block 6. When the limit pin 20 abuts against the outer wall of the safety block 6 and the abutting force continues to increase, the limit plate 30 can prevent the limit pin 20 from pushing the safety block 6 to cause lateral displacement. A connecting rod assembly is arranged between the limit member and the lever 10. Figures 6-8 As shown, the connecting rod assembly includes a rotating rod 23 which is coaxial with the shift rod 10 and extends toward the mounting block 5, a first connecting rod 24 is fixedly provided on the rotating rod 23, a second connecting rod 25 is hingedly provided at the end of the first connecting rod 24, and an end of the sleeve 19 away from the limit pin 20 forms a connecting block 22 which is hingedly matched with the other end of the second connecting rod 25.

[0029] Combined with the above structure, reference Figures 1 to 8 The following understanding can be obtained about the movement process of a mechanical insurance of an injection molding machine in this embodiment: When the sliding door of the injection molding machine is closed, the matching block will drive the lever 10 to flip up to the maximum stroke and then fall back to the preset stroke. When it flips up to the maximum stroke, the lever 10 drives the limiter to cooperate with the safety block 6 through the connecting rod assembly. The limiter will first press against the outer wall of the safety block 6. As the lever 10 rotates, the limiter is elastically compressed by the pressure of the connecting rod assembly. When the brake line 11 pulls the safety block 6 up to the maximum stroke and the limit slot 13 is aligned with the limiter, the limiter will elastically insert into the limit slot 13; when the lever 10 falls back to the preset stroke, the lever 10 will flip down a certain angle, causing the brake line 11 to retreat a part of the stroke, and the connecting rod will also retreat a part of the stroke but will still be in a state of resisting the limiter, so that the limiter remains in the limit slot 13 to limit the fall of the safety block 6. The mechanical insurance in this embodiment enables the injection molding machine to achieve the effect that the insurance block 6 can still keep away from the one-way limit groove 8 after the brake line 11 is relaxed in the closed state, so that the brake line 11 is no longer in a tensioned state for a long time, which can effectively extend the service life of the brake line 11 and reduce the later maintenance cost of the mechanical insurance of the injection molding machine; This embodiment does not need to add additional operating steps when implementing the step of loosening the brake line 11, and only needs to close the sliding door normally. Therefore, the structural change of this solution will not change the operator's usage habits, will not increase the difficulty of operation, and is more convenient.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A mechanical safety device for an injection molding machine, comprising a safety block (6) which is lifted or hinged on a mounting block (5) and the mounting block (5) is fixed on a tail plate (2), a pulling assembly for driving the safety block (6) to lift or flip, and a safety rod (7) which is horizontally fixed on a movable plate (3) and moves synchronously with the movable plate (3), wherein a plurality of one-way limiting grooves (8) are distributed at intervals along the axial direction of the safety rod (7) for limiting the movement of the movable plate (3) along the mold closing direction when the safety block (6) is embedded; The pulling assembly comprises a fixed mounting seat (9), a lever (10) hinged on the mounting seat (9), and a brake line (11) with two ends respectively connected to the safety block (6) and the lever (10); the movement of the lever (10) is controlled by the opening and closing of the sliding door, and when the sliding door is closed, the lever (10) turns upward, the brake line (11) is tightened and pulls the safety block (6) out of the one-way limit groove (8); Features: A limit holding mechanism is provided between the mounting block (5), the lever (10) and the sliding door, which keeps the safety block (6) in a disengaged state from the one-way limit slot (8) and the brake line (11) in a relaxed state when the sliding door is closed to a maximum stroke. The limit holding mechanism comprises a matching block provided on the sliding door and forcing the lever (10) to flip upward to a maximum stroke and then fall back to a preset stroke as the sliding door is closed, a limit slot (13) provided on the safety block (6), and a limit member that is elastically retracted horizontally in the mounting block (5) and retracted in the mounting block (5) in a normal state, and a connecting rod assembly is provided between the limit member and the lever (10); When the lever (10) is turned up, the limit piece is elastically pressed against the outer wall of the safety block (6) by the top pressure of the connecting rod assembly; when the lever (10) is turned up to the maximum stroke, the limit slot (13) is aligned with the limit piece and the limit piece is partially inserted into the limit slot (13); when the lever (10) falls back to the preset stroke, the top pressure of the connecting rod assembly on the limit piece is reduced but it is still in a plug-in state with the limit slot (13); when the lever (10) is retracted to the minimum stroke, the limit piece returns to normal and is disengaged from the limit slot (13).

2. The mechanical insurance of an injection molding machine according to claim 1, characterized in that: The matching block comprises an inclined guide plate (14) which is arranged obliquely and can force the lever (10) to turn up, a horizontal guide plate (15) which is extended from the top end of the inclined guide plate (14), and a retraction structure which is arranged on the horizontal guide plate (15) near the inclined guide plate (14) and allows the lever (10) to fall back from a maximum stroke to a preset stroke.

3. The mechanical insurance of an injection molding machine according to claim 2, characterized in that: The retraction structure comprises a groove (16) recessed on the horizontal guide plate (15); a slope (17) is formed on one side of the groove (16) close to the inclined guide plate (14) to facilitate the lever (10) to escape from the groove (16); and a guide wheel (18) is provided on the lever (10) to roll with the horizontal guide plate (15), the inclined guide plate (14), the groove (16) and the slope (17).

4. The mechanical insurance of an injection molding machine according to claim 3, characterized in that: The retraction stroke of the brake line (11) does not exceed 20% of the total stroke of the brake line (11) pulling the safety block (6).

5. The mechanical insurance of an injection molding machine according to claim 3, characterized in that: When the lever (10) retracts to a preset stroke, the angle between it and the horizontal guide plate (15) is less than 45°, and the angle between the inclined surface (17) and the bottom of the groove (16) is greater than 135°.

6. The mechanical insurance of an injection molding machine according to claim 1, characterized in that: The limiting member comprises a sleeve (19) which is guided and telescopically arranged in the mounting block (5) and a limiting pin (20) which is elastically telescopically arranged in the sleeve (19); one end of the sleeve (19) away from the limiting pin (20) forms a connecting block (22) which cooperates with the connecting rod assembly.

7. The mechanical insurance of an injection molding machine according to claim 6, characterized in that: The connecting rod assembly comprises a rotating rod (23) coaxially arranged on the shifting rod (10) and extending toward the mounting block (5), a first connecting rod (24) fixedly arranged on the rotating rod (23), and a second connecting rod (25) having two ends respectively hingedly connected to the first connecting rod (24) and the connecting block (22).

8. The mechanical insurance of an injection molding machine according to claim 1, characterized in that: A damping component is provided between the mounting seat (9) and the shifting rod (10) for increasing the resistance of the shifting rod (10) when the damping component cooperates with the groove (16) when the shifting rod (10) is separated from the groove (16). The damping component comprises a torsion spring (26) capable of driving the shifting rod (10) to flip downward. The two ends of the torsion spring (26) are respectively fixed relative to the mounting seat (9) and the shifting rod (10).

9. The mechanical insurance of an injection molding machine according to claim 1, characterized in that: The brake line (11) is provided with a mounting structure for stabilizing its two ends on the tail plate (2) and the fuselage (1) respectively.

10. The mechanical insurance of an injection molding machine according to claim 9, characterized in that: The mounting structure comprises a sleeve (27) disposed outside the brake line (11), a fastening structure (28) disposed at both ends of the sleeve (27), and mounting positions (29) for mounting the fastening structure (28) are respectively disposed on the tail plate (2) and the fuselage (1).

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