Safety protection device for injection molding machine

Abstract

The utility model discloses an injection molding machine safety protection device which comprises a head plate, a bottom plate, a tail plate, a safety door, a protective guard, an air cylinder and an ejector rob, the air cylinder comprises a fixed seat, an electromagnetic valve and a piston rod, the fixed seat is fixed on the bottom plate, the piston rod is vertically arranged, one end of the ejector rob is hinged with the head plate, and the upper end of the piston rod is hinged with the bottom of the ejector rob. When the ejector rod is in a horizontal state, the other end of the ejector rod faces the tail plate, a first proximity switch matched with the safety door is arranged on the protective fence, and the first proximity switch is electrically connected with the electromagnetic valve. When a protection device of the device loses efficacy in the production and operation process of the large injection molding machine, a protection system is formed by additionally arranging the mechanical lever, and the device is safe, economical and easy to operate.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection molding machines, and in particular relates to a safety protection device for injection molding machines. Background Art

[0002] Injection molding machines are the main molding equipment that uses molding molds to make plastic products of various shapes from thermoplastics or thermosetting plastics. At present, large injection molding machines on the market are only equipped with emergency stop switches and safety door protection programs. The safety level is enhanced with the improvement of information technology level, but safety accidents still occur frequently, and there are certain safety risks. Summary of the invention

[0003] Based on the above problems existing in the prior art, the utility model provides a safety protection device for an injection molding machine. When the built-in protection device fails during the production and operation of a large injection molding machine, a protection system is formed by adding a mechanical lever. The device is safe, economical and easy to operate.

[0004] The technical solution adopted to achieve the above-mentioned purpose of the utility model is:

[0005] A safety protection device for an injection molding machine comprises a head plate, a bottom plate, a tail plate, a safety door and a guardrail, and also comprises a cylinder and a push rod. The cylinder comprises a fixed seat, a solenoid valve and a piston rod. The fixed seat is fixed to the bottom plate, the piston rod is vertically arranged, one end of the push rod is hinged to the head plate, and the upper end of the piston rod is hinged to the bottom of the push rod. When the push rod is in a horizontal state, the other end of the push rod faces the tail plate. A first proximity switch cooperating with the safety door is arranged on the guardrail, and the first proximity switch is electrically connected to the solenoid valve.

[0006] The utility model also comprises an emergency switch which is fixed on the end surface of the other end of the top rod.

[0007] It also includes a pedal, a bracket and an alarm. The bracket includes a supporting cross plate and a pillar. The supporting cross plate is located directly above the bottom plate, the supporting cross plate is located between the two pedals, and the supporting cross plate is close to the head plate. There are multiple pillars, the lower end of each pillar is fixed to the bottom plate, and the upper end of each pillar is fixed to the bottom of the supporting cross plate. Gratings are respectively provided on the pedal and the supporting cross plate, and the gratings are electrically connected to the alarm.

[0008] It also includes a safety indicator light. A second proximity switch matched with the top rod is arranged at the bottom of the supporting horizontal plate. The second proximity switch is electrically connected to the safety indicator light.

[0009] The upper end of the piston rod is hinged to the middle position of the bottom of the push rod.

[0010] Compared with the prior art, the beneficial effects and advantages of the utility model are:

[0011] Based on the existing emergency stop button, safety door and other protection programs of large injection molding machines, this device only needs to add simple mechanical levers and gratings to achieve triple safety protection of grating protection, emergency stop button linkage and mechanical insurance, solving the safety protection problem of operators when the injection molding machine's own protection device / program fails. It is simple to operate, economical and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of the safety protection device of the injection molding machine.

[0013] Figure 2 is the distribution map of the grating.

[0014] Among them, 1-head plate, 2-tail plate, 3-bottom plate, 4-pedal, 5-top rod, 6-emergency switch, 7-support cross plate, 8-pillar, 9-grating, 10-fixed seat, 11-piston rod, 12-safety door, 13-guardrail, 14-first proximity switch, 15-second proximity switch. DETAILED DESCRIPTION

[0015] The utility model is described in detail below in conjunction with the accompanying drawings.

[0016] The structural schematic diagram of the injection molding machine safety protection device provided in this embodiment is as follows Figure 1-2 As shown, it includes a head plate 1, a bottom plate 3, a tail plate 2, a pedal 4, a cylinder, a push rod 5, a bracket, an emergency switch 6, an alarm light, a safety door 12, a guardrail 13 and a safety indicator light.

[0017] The guardrail 13 is located outside the main body of the injection molding machine, and the main body of the injection molding machine is surrounded by the guardrail to prevent the operator from being injured when the injection molding machine is working. A first proximity switch 14 cooperating with the safety door 12 is provided on the guardrail 13. When the safety door 12 is fully opened, the safety door 12 triggers the first proximity switch 14 to close.

[0018] The cylinder comprises a fixing seat 10, a solenoid valve and a piston rod 11. The fixing seat 10 is fixed on the bottom plate 1, and the piston rod 11 is vertically arranged. The solenoid valve is electrically connected to the first proximity switch. When the first proximity switch is closed, the solenoid valve is energized and the cylinder starts to work.

[0019] One end of the push rod 5 is hinged to the head plate, and the upper end of the piston rod 11 is hinged to the middle position of the bottom of the push rod 5. When the push rod is in a horizontal state, the other end of the push rod 5 faces the tail plate 2. The emergency switch 6 is fixed to the end surface of the push rod 5 facing the tail plate, and the emergency switch originally fixed to the outside of the injection molding machine is set on the push rod. When the tail plate touches the emergency switch, the mold closing injury accident can be avoided.

[0020] The bracket includes a supporting cross plate 7 and pillars 8, and the supporting cross plate 7 is square. The supporting cross plate 7 is located directly above the bottom plate 3, between the two pedals 4, and close to the head plate 1. There are four pillars 8, which are distributed in a square shape, the lower ends of the four pillars 8 are welded to the bottom plate 1, and the upper ends of the four pillars 8 are respectively welded to the bottom of the four corners of the supporting cross plate 7.

[0021] The supporting cross plate 7 is symmetrically provided with gratings 9 on both sides near the two pedals 4. The pedal 4 is symmetrically provided with gratings 9 on both sides near the head plate and the tail plate. The two gratings on the pedal and the two gratings on the supporting cross plate are electrically connected to the warning light.

[0022] A second proximity switch 15 cooperating with the push rod is provided at the bottom of the support cross plate 7, and the second proximity switch 15 is electrically connected to the safety indicator light. When the piston rod 11 reaches the upper limit position, the push rod 5 reaches the set position, and the push rod 5 triggers the second proximity switch 15 to close. After the first proximity switch is closed, the safety indicator light turns on.

[0023] When the mold opening is completed, the operator manually opens the safety door 12. When the safety door 12 is fully opened, the safety door 12 triggers the first proximity switch 14, the first proximity switch 14 is closed, the solenoid valve is started, and the piston rod 11 is lifted. When the piston rod 11 reaches the upper limit, the push rod 5 triggers the second proximity switch 15, the second proximity switch 15 is closed, and the safety indicator light is on. The operator enters the working area to take the product. At this time, the grating 9 detects the entry of the person, the alarm light starts to flash and there is a buzzer reminder. After the operator leaves the working area, during the process of manually closing the safety door 12, the first proximity switch 14 is disconnected, the solenoid valve is disconnected, and the piston rod 11 begins to fall. During the process of the piston rod 11 falling, the second proximity switch 15 is disconnected. When the safety door 12 is fully closed, the operator starts to manually lock the mold, and the following cycles are repeated.

[0024] When the injection molding machine suddenly loses control and closes the mold after opening the mold, the tail plate 2 will first touch the emergency switch 6 during the mold closing process. At this time, the injection molding machine stops working. However, the tail plate 2 rushes toward the head plate 1 due to inertia due to its high speed. The push rod 5 plays a protective role and holds up the tail plate 2, forming dual circuit and mechanical protection.

Claims

1. A safety protection device for an injection molding machine, comprising a head plate, a bottom plate, a tail plate, a safety door and a guardrail, Features: It also includes a cylinder and a push rod. The cylinder includes a fixed seat, a solenoid valve and a piston rod. The fixed seat is fixed on the base plate. The piston rod is vertically arranged. One end of the push rod is hinged to the head plate. The upper end of the piston rod is hinged to the bottom of the push rod. When the push rod is in a horizontal state, the other end of the push rod faces the tail plate. A first proximity switch cooperating with the safety door is provided on the guardrail, and the first proximity switch is electrically connected to the solenoid valve.

2. The safety protection device for injection molding machine according to claim 1, Features: The utility model also comprises an emergency switch which is fixed on the end surface of the other end of the top rod.

3. The safety protection device for injection molding machine according to claim 1, Features: It also includes a pedal, a bracket and an alarm. The bracket includes a supporting cross plate and a pillar. The supporting cross plate is located directly above the bottom plate, the supporting cross plate is located between the two pedals, and the supporting cross plate is close to the head plate. There are multiple pillars, the lower end of each pillar is fixed to the bottom plate, and the upper end of each pillar is fixed to the bottom of the supporting cross plate. Gratings are respectively provided on the pedal and the supporting cross plate, and the gratings are electrically connected to the alarm.

4. The safety protection device for injection molding machine according to claim 3, Features: It also includes a safety indicator light. A second proximity switch matched with the top rod is arranged at the bottom of the supporting horizontal plate. The second proximity switch is electrically connected to the safety indicator light.

5. The safety protection device for injection molding machine according to claim 1, Features: The upper end of the piston rod is hinged to the middle position of the bottom of the push rod.

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