The mold opening and closing device and its linkage safety mechanism of the injection blow molding machine

Abstract

The invention discloses a mold opening and closing device of an injection blow molding machine and a connecting rod safety mechanism thereof, wherein the connecting rod safety mechanism comprises a supporting frame, an injection mold connecting rod and a blow mold connecting rod are arranged on the supporting frame, the injection mold connecting rod is located above the blow molding mold, the blow molding connecting rod is located above the injection molding mold, springs are respectively arranged on the upper parts of the injection mold connecting rod and the blow molding connecting rod, detection blocks for detecting spring compression are connected to the springs, the detection blocks are connected to a switch for controlling the mold opening and closing actions, the lower ends of the injection mold connecting rod and the blow molding connecting rod are respectively connected to an injection mold rotating arm and a blow molding rotating arm, the injection mold rotating arm and the blow molding rotating arm are cross-arranged, the lower ends of the injection mold rotating arm and the blow molding rotating arm are respectively connected to the upper part of the blow molding mold and the upper part of the injection mold, a collision block located at the intersection of the injection mold rotating arm and the blow molding rotating arm is further arranged on the turntable, when the injection molding mold or the blow molding mold contacts a core rod, the collision block hits the injection molding rotating arm or the blow molding rotating arm, after the detection block detects the compression of the spring, the detection block is disconnected from the switch, and the mold opening and closing actions stop.

Description

Technical Field

[0001] The invention relates to a mold opening and closing device of an injection-blow molding machine and a connecting rod safety mechanism thereof, belonging to the technical field of injection-blow molding machine equipment. Background Art

[0002] The mold opening and closing device is an important device in the injection blow molding machine. Under normal circumstances, the normal action sequence of the mold opening and closing device is: mold opening - turntable rising - rotation - turntable descending - mold closing; the above 5 actions are completed in sequence and cannot be confused, otherwise the mold may be damaged. For example, if the "turntable rising" is started before the "mold opening" is completed, the core rod installed on the turntable will hit the mold and cause damage to the core rod; or if the "mold closing" action is performed before the "turntable descending" is in place, the mold may also hit the core rod and cause damage. However, since customers will continue to put forward higher requirements for the molding cycle of the equipment, the faster the action, the better, which can increase the output of the equipment. If the "mold opening" and "turntable rising" can be carried out at the same time, and the "mold closing" and "turntable descending" can be carried out at the same time, the efficiency can be effectively improved. Through analysis, it was found that the "turntable rise" should start working when the "mold opening" is in progress, because both actions are driven by hydraulic cylinders. Although the speed can be controlled by the flow valve, the hydraulic drive will have unreliable defects: for example, the viscosity will change after the oil temperature changes, and the speed of the action will change accordingly; in addition, the cylinder and the solenoid valve may suddenly become abnormal, and the above problems will cause damage to the mold. At the same time, the same problem also exists when the "mold closing" and "turntable descending" are carried out simultaneously. These problems are difficult to ensure the safety of the mold by conventional methods. Summary of the invention

[0003] The purpose of the present invention is to provide a mold opening and closing device for an injection blow molding machine that can shorten the equipment operation cycle and enable mold opening and closing and turntable lifting to be performed simultaneously, so as to solve the technical problem that the mold opening and closing device of the prior art cannot ensure the mold safety when the mold opening and closing and turntable lifting are performed simultaneously. At the same time, the present invention also provides a connecting rod safety mechanism in the mold opening and closing device.

[0004] The mold opening and closing device of the injection blow molding machine of the present invention adopts the following technical scheme: the mold opening and closing device of the injection blow molding machine comprises a table panel and a turntable arranged on the table panel, a blow mold and an injection mold are respectively arranged on both sides of the turntable, the blow mold and the injection mold each comprise an upper and lower part, the blow mold and the injection mold are both fixed on the table panel, the mold opening and closing device also comprises a connecting rod safety mechanism, the connecting rod safety mechanism comprises a support frame arranged above the blow mold and the injection mold, an injection mold connecting rod and a blow mold connecting rod which are vertically spaced and move up and down are arranged on the support frame, the injection mold connecting rod is located above the blow mold, the blow mold connecting rod is located above the injection mold, the upper parts of the injection mold connecting rod and the blow mold connecting rod are respectively provided with springs, and each spring has a The detection blocks are connected with the detection blocks for detecting the compression of the springs, the detection blocks are connected with the switch for controlling the opening and closing of the molds, the lower ends of the injection mold connecting rod and the blow mold connecting rod are respectively connected with the injection mold rotating arm and the blow mold rotating arm, the injection mold rotating arm and the blow mold rotating arm are cross-arranged, the lower ends of the injection mold rotating arm and the blow mold rotating arm are respectively connected with the upper part of the blow mold and the upper part of the injection mold, the turntable is also provided with a collision block located at the intersection of the injection mold rotating arm and the blow mold rotating arm, when the injection mold or the blow mold contacts the core rod, the collision block hits the injection mold rotating arm or the blow mold rotating arm, the injection mold connecting rod or the blow mold connecting rod is forced to move upward, the spring on the injection mold connecting rod or the blow mold connecting rod is compressed, after the detection block detects the compression of the spring, the detection block is disconnected from the switch, and the opening and closing of the molds stops.

[0005] The upper ends of the injection molding connecting rod and the blow molding connecting rod are both hollow structures, the lower ends of the two springs are respectively fixed inside the injection molding connecting rod and the blow molding connecting rod, and the upper parts of the injection molding connecting rod and the blow molding connecting rod are respectively provided with supports, the upper parts of the two supports are both installed on the support frame through a rotating shaft, and the lower parts are respectively located in the injection molding connecting rod and the blow molding connecting rod and contact the upper ends of the springs.

[0006] When the spring is not compressed, the detection block contacts the switch; when the spring is compressed, the detection block is separated from the switch.

[0007] The switch is an inductive switch arranged above the detection block. The detection block is inductively connected to the inductive switch. When the detection block detects that the spring is compressed, the induction between the detection block and the switch is disconnected.

[0008] The detection block and the induction switch are both located on the side surfaces outside the injection mold connecting rod and the blow mold connecting rod.

[0009] The connecting rod safety mechanism of the mold opening and closing device of the injection blow molding machine of the present invention adopts the following technical scheme: the connecting rod safety mechanism of the mold opening and closing device of the injection blow molding machine comprises a support frame for being arranged above the blow molding mold and the injection molding mold, the support frame is provided with an injection molding connecting rod and a blow molding connecting rod which are vertically spaced and move up and down, the injection molding connecting rod is located above the blow molding mold, the blow molding connecting rod is located above the injection molding mold, the upper parts of the injection molding connecting rod and the blow molding connecting rod are respectively provided with springs, each spring is connected with a detection block for detecting the compression of the spring, the detection block is connected with a switch for controlling the opening and closing of the molding, the injection molding connecting rod and the blow molding connecting rod are ... The lower end of the connecting rod is respectively connected to the injection mold rotating arm and the blow mold rotating arm, which are cross-arranged, and the lower ends of the injection mold rotating arm and the blow mold rotating arm are respectively connected to the upper part of the blow mold and the upper part of the injection mold. The turntable is also provided with a collision block located at the intersection of the injection mold rotating arm and the blow mold rotating arm. When the injection mold or the blow mold contacts the core rod, the collision block hits the injection mold rotating arm or the blow mold rotating arm, and the injection mold connecting rod or the blow mold connecting rod is forced to move upward, and the spring on the injection mold connecting rod or the blow mold connecting rod is compressed. After the detection block detects the compression of the spring, the detection block is disconnected from the switch, and the opening and closing of the mold stops.

[0010] The upper ends of the injection molding connecting rod and the blow molding connecting rod are both hollow structures, the lower ends of the two springs are respectively fixed inside the injection molding connecting rod and the blow molding connecting rod, and the upper parts of the injection molding connecting rod and the blow molding connecting rod are respectively provided with supports, the upper parts of the two supports are both installed on the support frame through a rotating shaft, and the lower parts are respectively located in the injection molding connecting rod and the blow molding connecting rod and contact the upper ends of the springs.

[0011] When the spring is not compressed, the detection block contacts the switch; when the spring is compressed, the detection block is separated from the switch.

[0012] The switch is an inductive switch arranged above the detection block. The detection block is inductively connected to the inductive switch. When the detection block detects that the spring is compressed, the induction between the detection block and the switch is disconnected.

[0013] The detection block and the induction switch are both located on the side surfaces outside the injection mold connecting rod and the blow mold connecting rod.

[0014] The beneficial effect of the present invention is that since the mold opening and closing stroke is twice the turntable lifting stroke, for example, if the mold opening and closing stroke is 120, the turntable lifting stroke is 60. Therefore, the present invention designs a connecting rod safety mechanism. This connecting rod installation mechanism can effectively avoid the damage to the mold caused by abnormal opening and closing of the mold and the turntable lifting and lowering. The main working principle of the connecting rod safety mechanism is: "mold opening" and "turntable rising" work at the same time. If the "turntable rising" action is faster, before the core rod may hit the mold, the impact block installed on the turntable will first hit the turntable arm, limiting the rising speed of the turntable. If the mold opening cylinder or solenoid valve is abnormal, the mold opening action stops or slows down extremely, and the turntable still runs quickly, the impact block will first hit the blow mold turntable arm with force, causing the spring in the blow mold connecting rod to compress, and the detection block on the blow mold connecting rod is disconnected from the switch, the equipment will immediately stop working and alarm. At the same time, "mold closing" and "turntable lowering" work at the same time. If the "mold closing" action is faster, before the mold may hit the core rod, the injection molding arm will first hit the collision block installed on the turntable to limit the speed of mold closing. If the turntable lowering cylinder or solenoid valve is abnormal, the lowering action stops or slows down extremely, and the mold closing is still carried out quickly. At this time, the injection molding arm will first hit the collision block strongly, causing the spring in the injection molding connecting rod to compress, and the detection block on the injection molding connecting rod is disconnected from the switch. The equipment will stop working immediately and alarm. In this way, the possibility of damage to the mold caused by abnormal equipment operation is eliminated. Under the premise of ensuring the safe operation of the equipment, the present invention allows "mold opening" and "turntable rising" to be carried out simultaneously, and allows "mold closing" and "turntable lowering" to be carried out simultaneously, thereby shortening the equipment molding cycle, improving work efficiency, and increasing output.

[0015] Preferably, the spring is arranged inside the injection molding connecting rod and the blow molding connecting rod to ensure that the spring is compressed when the injection molding connecting rod and the blow molding connecting rod are in motion.

[0016] Preferably, the switch adopts an inductive switch inductively connected to the detection block, so the opening and closing of the mold is stopped more sensitively. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a mold opening state diagram of a mold opening and closing device of an injection blow molding machine according to an embodiment of the present invention;

[0018] Figure 2 It is a mold closing state diagram of a mold opening and closing device of an injection blow molding machine according to an embodiment of the present invention.

[0019] In the figure, 1-table panel, 2-turntable, 3-blow mold, 4-injection mold, 5-support frame, 61-injection mold connecting rod, 62-blow mold connecting rod, 7-spring, 8-detection block, 9-switch, 101-injection mold rotating arm, 102-blow mold rotating arm, 11-impact block, 12-core rod, 13-support. DETAILED DESCRIPTION

[0020] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] The structure of an embodiment of the mold opening and closing device of the injection blow molding machine of the present invention is as follows: Figure 1 and Figure 2 As shown, the mold opening and closing device of the injection blow molding machine of this embodiment comprises a table panel 1 and a turntable 2 arranged on the table panel 1, a blow mold 3 and an injection mold 4 are respectively arranged on both sides of the turntable 2, a core rod 12 installed on the turntable is between the blow mold 3 and the injection mold 4, the blow mold 3 and the injection mold 4 each comprise an upper and lower part, the blow mold 3 and the injection mold 4 are both fixed on the table panel 1, the mold opening and closing device also comprises a connecting rod safety mechanism, the connecting rod safety mechanism comprises a support frame 5 arranged above the blow mold 3 and the injection mold 4, an injection mold connecting rod 61 and a blow mold connecting rod 62 which are vertically spaced and move up and down are arranged on the support frame 5, the injection mold connecting rod 61 is located above the blow mold 3, the blow mold connecting rod 62 is located above the injection mold 4, springs 7 are respectively arranged on the upper parts of the injection mold connecting rod 61 and the blow mold connecting rod 62, each spring 7 is connected with a detection block 8 for detecting spring compression, and the detection block 8 for detecting spring compression is connected to the upper part of the injection mold connecting rod 61 and the blow mold connecting rod 62. The measuring block 8 is connected to a switch 9 for controlling the opening and closing of the molds. The switch 9 is mounted on the supporting frame 5. The lower ends of the injection mold connecting rod 61 and the blow mold connecting rod 62 are respectively connected to the injection mold rotating arm 101 and the blow mold rotating arm 102 through a rotating shaft. The injection mold rotating arm 101 and the blow mold rotating arm 102 are cross-arranged. The lower ends of the injection mold rotating arm 101 and the blow mold rotating arm 102 are respectively connected to the upper part of the blow mold 3 and the upper part of the injection mold 4 through a rotating shaft. The turntable 1 is also provided with a collision block 11 located at the intersection of the injection mold rotating arm 101 and the blow mold rotating arm 102. When the injection mold 4 or the blow mold 3 contacts the core rod 12, the collision block 8 hits the injection mold rotating arm 101 or the blow mold rotating arm 102, and the injection mold connecting rod 61 or the blow mold connecting rod 62 is forced to move upward, and the spring 7 on the injection mold connecting rod 61 or the blow mold connecting rod 62 is compressed. After the measuring block 8 detects that the spring 7 is compressed, the measuring block 7 is disconnected from the switch 9, and the opening and closing of the molds stops.

[0022] In this embodiment, the upper ends of the injection molding connecting rod 61 and the blow molding connecting rod 62 are hollow structures, and the lower ends of the two springs 7 are respectively fixed inside the injection molding connecting rod 101 and the blow molding connecting rod 102. The injection molding connecting rod 101 and the upper 102 of the blow molding connecting rod are respectively provided with a support 13. The upper parts of the two supports 13 are installed on the support frame 5 through a rotating shaft, and the lower parts are respectively located in the injection molding connecting rod 101 and the blow molding connecting rod 102 and contact the upper ends of the springs 7. When the spring 7 is not compressed, the detection block 8 is in contact with the switch 9; when the spring 7 is compressed, the detection block 8 is separated from the switch 9. The switch 9 is an induction switch arranged above the detection block. The detection block 8 is inductively connected with the induction switch. When the detection block 8 detects that the spring 7 is compressed, the induction between the detection block 7 and the switch 9 is disconnected. The detection block 8 and the switch 9 are both located on the side outside the injection molding connecting rod 61 and the blow molding connecting rod 62.

[0023] The present invention can realize synchronous lifting of the turntable and opening and closing of the mold, thereby improving the operation efficiency of the equipment. Figure 1 It is the stage of mold closing. The installation points that should be ensured at this time are: 1. The spring must ensure the preload to prevent compression under slight force; 2. The collision block and the rotating arm must be in contact, which can be achieved by adjusting the position; 3. Adjust the position of the induction switch close to the detection block to ensure that the switch is in the on state; 4. Both injection molding and blow molding need to be adjusted well, and any abnormality can be protected; adjust the speed of mold opening and turntable rise respectively, generally make the mold opening speed faster, "mold opening" and "turntable rise" work at the same time, and both can be smoothly in place normally. The core rod will not hit the mold because of the slow lifting speed. If the mold opening action is slow, the collision block will hit the rotating arm before the core rod hits the mold. The resistance will limit the rising speed of the turntable, and it can still work smoothly. If the mold opening action stops suddenly, the collision block will also hit the rotating arm first. If the rising force is relatively large, the spring in the connecting rod will be compressed. At this time, the detection block will be compressed away from the induction switch with the spring. Once the switch is disconnected, the equipment will stop working immediately to ensure the safety of the mold and the core rod. Figure 2 This is the diagram of the mold opening stage: "Mold closing" and "turntable descending" work at the same time. Adjust the speed of mold closing and turntable descending. Under normal circumstances, they can work smoothly and the mold will not hit the core rod. If the turntable descends slowly, the mold arm will hit the collision block before hitting the core rod. The resistance will limit the mold closing speed and still ensure that all actions are in place smoothly. If the turntable descends suddenly, the arm will hit the collision block first. The increase in mold closing force will compress the spring in the connecting rod. At this time, the detection block will be compressed away from the induction switch with the spring. Once the switch is disconnected, the equipment will stop working immediately to ensure the safety of the mold and core rod.

[0024] An embodiment of the connecting rod safety mechanism of the present invention and Figure 1 and Figure 2The embodiment of the connecting rod safety mechanism in the embodiment has the same structure. The connecting rod safety mechanism of this embodiment includes a support frame 5 arranged above the blow mold 3 and the injection mold 4. The support frame 5 is provided with an injection mold connecting rod 61 and a blow mold connecting rod 62 which are vertically spaced and move up and down. The injection mold connecting rod 61 is located above the blow mold 3, and the blow mold connecting rod 62 is located above the injection mold 4. The upper parts of the injection mold connecting rod 61 and the blow mold connecting rod 62 are respectively provided with springs 7, and each spring 7 is connected to a detection block 8 for detecting spring compression. The detection block 8 is connected to a switch 9 that controls the opening and closing of the mold, and the switch 9 is installed on the support frame 5. The lower ends of the injection mold connecting rod 61 and the blow mold connecting rod 62 are respectively connected to the injection mold rotating arm 101 and The blow mold rotating arm 102, the injection mold rotating arm 101 and the blow mold rotating arm 102 are cross-arranged, and the lower ends of the injection mold rotating arm 101 and the blow mold rotating arm 102 are respectively connected to the upper part of the blow mold 3 and the upper part of the injection mold 4. The turntable 1 is also provided with a collision block 11 located at the intersection of the injection mold rotating arm 101 and the blow mold rotating arm 102. When the injection mold 4 or the blow mold 3 contacts the core rod 12, the collision block 8 hits the injection mold rotating arm 101 or the blow mold rotating arm 102, and the injection mold connecting rod 61 or the blow mold connecting rod 62 is forced to move upward, and the spring 7 on the injection mold connecting rod 61 or the blow mold connecting rod 62 is compressed. After the detection block 8 detects the compression of the spring 7, the detection block 7 is disconnected from the switch 9, and the opening and closing of the mold stops.

[0025] The upper ends of the injection molding connecting rod 61 and the blow molding connecting rod 62 are both hollow structures. The lower ends of the two springs 7 are respectively fixed inside the injection molding connecting rod 101 and the blow molding connecting rod 102. The injection molding connecting rod 101 and the upper 102 of the blow molding connecting rod are respectively provided with a support 13. The upper parts of the two supports 13 are both mounted on the support frame 5 through a rotating shaft, and the lower parts are respectively located in the injection molding connecting rod 101 and the blow molding connecting rod 102 and contact the upper ends of the springs 7. When the spring 7 is not compressed, the detection block 8 is in contact with the switch 9; when the spring 7 is compressed, the detection block 8 is separated from the switch 9. The switch 9 is an induction switch arranged above the detection block. The detection block 8 is inductively connected to the induction switch. When the detection block 8 detects that the spring 7 is compressed, the induction between the detection block 7 and the switch 9 is disconnected. The detection block 8 and the switch 9 are both located on the side outside the injection molding connecting rod 61 and the blow molding connecting rod 62.

[0026] The present invention utilizes the connecting rod safety mechanism to ensure the safe operation of the equipment, allowing "mold opening" and "turntable rising" to be carried out simultaneously, and "mold closing" and "turntable descending" to be carried out simultaneously, thereby shortening the equipment molding cycle, improving work efficiency and increasing output.

[0027] The above embodiments are preferred embodiments of the present invention. Those skilled in the art should understand that the above embodiments do not limit the protection scope of the present invention in any form, and all technical solutions obtained by equivalent replacement and the like fall within the protection scope of the present invention.

[0028] The parts not involved in the present invention are the same as the prior art or can be implemented by using the prior art.

Claims

1. A mold opening and closing device for an injection blow molding machine, comprising a table panel and a turntable arranged on the table panel, a blow molding mold and an injection molding mold are arranged on both sides of the turntable, each of the blow molding mold and the injection molding mold comprises an upper and lower part, and both the blow molding mold and the injection molding mold are fixed on the table panel, characterized in that: The mold opening and closing device also includes a connecting rod safety mechanism, which includes a support frame arranged above the blow mold and the injection mold, the support frame is provided with an injection mold connecting rod and a blow mold connecting rod which are vertically spaced and move up and down, the injection mold connecting rod is located above the blow mold, the blow mold connecting rod is located above the injection mold, the upper parts of the injection mold connecting rod and the blow mold connecting rod are respectively provided with springs, each spring is connected with a detection block for detecting spring compression, the detection block is connected with a switch for controlling the mold opening and closing action, the lower ends of the injection mold connecting rod and the blow mold connecting rod are respectively connected with an injection mold rotating arm and a blow mold rotating arm, the injection mold rotating arm and the blow mold rotating arm are cross-arranged, the lower ends of the injection mold rotating arm and the blow mold rotating arm are respectively connected to the upper part of the blow mold and the upper part of the injection mold, the turntable is also provided with a collision block located at the intersection of the injection mold rotating arm and the blow mold rotating arm, when the injection mold or the blow mold When in contact with the core rod, the collision block hits the injection mold rotating arm or the blow mold rotating arm, the injection mold connecting rod or the blow mold connecting rod is forced to move upward, the spring on the injection mold connecting rod or the blow mold connecting rod is compressed, and after the detection block detects the compression of the spring, the detection block is disconnected from the switch, and the mold opening and closing action stops; the upper ends of the injection mold connecting rod and the blow mold connecting rod are both hollow structures, the lower ends of the two springs are respectively fixed inside the injection mold connecting rod and the blow mold connecting rod, and the upper parts of the injection mold connecting rod and the blow mold connecting rod are respectively provided with supports, the upper parts of the two supports are both installed on the support frame through the rotating shaft, and the lower parts are respectively located in the injection mold connecting rod and the blow mold connecting rod and contact with the upper ends of the springs; when the spring is not compressed, the detection block is in contact with the switch; when the spring is compressed, the detection block is separated from the switch, and the mold opening and closing action stops; "mold opening" and "turntable rising" are carried out simultaneously, and "mold closing" and "turntable descending" are carried out simultaneously.

2. The mold opening and closing device of the injection blow molding machine according to claim 1, characterized in that: The switch is an inductive switch arranged above the detection block. The detection block is inductively connected to the inductive switch. When the detection block detects that the spring is compressed, the induction between the detection block and the switch is disconnected.

3. The mold opening and closing device of the injection blow molding machine according to claim 1, characterized in that: The detection block and the induction switch are both located on the side surfaces outside the injection mold connecting rod and the blow mold connecting rod.

4. The connecting rod safety mechanism of the mold opening and closing device of the injection blow molding machine according to claim 1, characterized in that: The invention comprises a support frame for being arranged above the blow mold and the injection mold, the support frame is provided with an injection mold connecting rod and a blow mold connecting rod which are vertically spaced and move up and down, the injection mold connecting rod is located above the blow mold, the blow mold connecting rod is located above the injection mold, the upper parts of the injection mold connecting rod and the blow mold connecting rod are respectively provided with springs, each spring is connected with a detection block for detecting the compression of the spring, the detection block is connected with a switch for controlling the opening and closing of the mold, the lower ends of the injection mold connecting rod and the blow mold connecting rod are respectively connected with an injection mold rotating arm and a blow mold rotating arm, the injection mold rotating arm and the blow mold rotating arm are cross-arranged, the lower ends of the injection mold rotating arm and the blow mold rotating arm are respectively connected to the upper part of the blow mold and the upper part of the injection mold, the turntable is also provided with a collision block located at the intersection of the injection mold rotating arm and the blow mold rotating arm, when the injection mold or the blow mold contacts the core rod, the collision block hits the injection mold rotating arm or the blow mold rotating arm, the injection mold connecting rod or The blow mold connecting rod is forced to move upward, and the spring on the injection mold connecting rod or the blow mold connecting rod is compressed. After the detection block detects the compression of the spring, the detection block is disconnected from the switch, and the opening and closing of the mold stops; the upper ends of the injection mold connecting rod and the blow mold connecting rod are hollow structures, and the lower ends of the two springs are respectively fixed inside the injection mold connecting rod and the blow mold connecting rod. The upper parts of the injection mold connecting rod and the blow mold connecting rod are respectively provided with supports, and the upper parts of the two supports are both mounted on the support frame through a rotating shaft, and the lower parts are respectively located in the injection mold connecting rod and the blow mold connecting rod and contact the upper ends of the springs; the upper ends of the injection mold connecting rod and the blow mold connecting rod are hollow structures, and the lower ends of the two springs are respectively fixed inside the injection mold connecting rod and the blow mold connecting rod. The upper parts of the injection mold connecting rod and the blow mold connecting rod are respectively provided with supports, and the upper parts of the two supports are both mounted on the support frame through a rotating shaft, and the lower parts are respectively located in the injection mold connecting rod and the blow mold connecting rod and contact the upper ends of the springs; "opening the mold" and "turntable rising" are carried out simultaneously, and "closing the mold" and "turntable descending" are carried out simultaneously.

5. The connecting rod safety mechanism of the mold opening and closing device of the injection blow molding machine according to claim 4, characterized in that: The switch is an inductive switch arranged above the detection block. The detection block is inductively connected to the inductive switch. When the detection block detects that the spring is compressed, the induction between the detection block and the switch is disconnected.

6. The connecting rod safety mechanism of the mold opening and closing device of the injection blow molding machine according to claim 4, characterized in that: The detection block and the induction switch are both located on the side surfaces outside the injection mold connecting rod and the blow mold connecting rod.

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