Safety device for plastic injection molding machine

Abstract

The utility model discloses a kind of safety protection devices of plastic injection molding machine, belong to plastic injection molding machine technical field;Including molding machine body, feeding mechanism;The inside one end of molding machine body is equipped with fixed mould, the other end is equipped with the dynamic mould driven by hydraulic rod, the front of molding machine body is equipped with protective door, molding machine body is equipped with the mechanical protection mechanism of fixed dynamic mould position by protective door control, the hydraulic protection mechanism of the hydraulic circuit of interrupting hydraulic press is powered off by electrical protection mechanism of molding machine body, interrupting hydraulic press;By setting mechanical protection mechanism, so that molding machine body when using, open protective door, the position of dynamic mould can be fixed, so that dynamic mould can be mechanically fixed, and then the protection strength of molding machine body is strengthened.

Description

Technical Field

[0001] This utility model provides a safety protection device for a plastic injection molding machine, belonging to the technical field of plastic injection molding machines. Background Technology

[0002] Plastic injection molding machines are precision equipment used to manufacture plastic products. They heat and melt thermoplastic or thermosetting plastic materials, inject them into the mold cavity under high pressure, and then cool and solidify them to form the desired product shape. They are widely used in the automotive, electronics, consumer goods and medical fields, and can efficiently and accurately mass-produce plastic parts of various complex shapes.

[0003] Currently, plastic injection molding machines mainly use two types of interlocking protection devices: electrical and hydraulic. The electrical protection device is an electrical interlock installed on both sides of the safety door of the plastic injection molding machine. When the safety door is opened, the limit switch is released, causing it to send an electrical signal, preventing the mold closing action. After the safety door is closed, the limit switch is pressed, which in turn sends an electrical signal, allowing the mold closing action to proceed. The hydraulic interlocking protection device refers to a hydraulic valve being pressed when the safety door is open, causing the oil circuit of the mold closing hydraulic cylinder to return directly to the cylinder, cutting off the mold closing power and preventing mold closing. After the safety door is closed, the hydraulic valve is released, and the oil circuit of the mold closing cylinder returns to normal, allowing the mold closing action to proceed.

[0004] However, after prolonged use, the sensitivity of the electrical interlocks in a plastic injection molding machine may change, potentially leading to failure. Using only a hydraulic protection mechanism is insufficient for protection. Utility Model Content

[0005] The technical problem this invention aims to solve is that current plastic injection molding machines mainly use two types of interlocking protection devices: electrical and hydraulic. After prolonged use, the sensitivity of the electrical interlocking may change, potentially leading to failure. Using only a hydraulic protection mechanism provides insufficient protection.

[0006] To solve the above problems, the proposed technical solution is as follows: a safety protection device for a plastic injection molding machine, including a molding machine body and a feeding mechanism; a fixed mold is provided at one end of the interior of the molding machine body, and a moving mold driven by a hydraulic rod is provided at the other end; a protective door is provided on the front of the molding machine body; a mechanical protection mechanism is provided on the molding machine body to control and fix the position of the moving mold through the protective door; an electrical protection mechanism to disconnect the power to the molding machine body; and a hydraulic protection mechanism to interrupt the hydraulic circuit of the hydraulic press.

[0007] As an improvement, the molding machine body is controlled by a control panel located on one side of the front of the molding machine body;

[0008] As an improvement, the feeding mechanism includes a material cylinder, one side of which is connected to a screw conveyor at the lower end of the material cylinder, and the end of the screw conveyor is connected to a fixed mold;

[0009] As an improvement, the mechanical protection mechanism includes a slot at the lower end of the moving mold, a slide groove in the molding machine body located below the slot, a fixed rod that slides up and down in the slide groove and slot, a connecting rod that slides back and forth in the lower part of the slide groove and pushes the fixed rod to move up and down, and a control rod that is located on one side of the protective door and pushes the connecting rod when it is opened;

[0010] As an improvement, the electrical protection mechanism includes an electrical safety lock installed inside the molding machine body. The electrical safety lock is connected to the control panel. When the protective door is closed, the electrical safety lock is closed and the molding machine body operates normally. When the protective door is opened, the electrical safety lock is opened and the operating circuit of the molding machine body is disconnected.

[0011] As an improvement, the hydraulic protection mechanism includes a hydraulic safety valve installed on the hydraulic oil circuit of the hydraulic press. When the protection door is closed, the hydraulic safety valve is not pressed, and the hydraulic oil circuit of the hydraulic press is normal. When the protection door is opened, the hydraulic safety valve is pressed to interrupt the hydraulic circuit and allow the hydraulic oil to drain back to the hydraulic oil tank.

[0012] The beneficial effects of this utility model are:

[0013] By setting up a mechanical protection mechanism, the mold body can be fixed in position when the protective door is opened during use, thereby mechanically fixing the mold body and strengthening the protection of the molding machine body. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of a safety protection device for a plastic injection molding machine according to the present invention.

[0015] Figure 2 This is a schematic diagram of the protective door of a safety protection device for a plastic injection molding machine when it is opened.

[0016] Figure 3 This is a schematic diagram of the mechanical protection mechanism of a safety protection device for a plastic injection molding machine according to the present invention.

[0017] Figure 4 This is an exploded view of the mechanical protection mechanism of a safety protection device for a plastic injection molding machine according to this utility model.

[0018] 1. Molding machine body; 101. Fixed mold; 102. Moving mold; 103. Protective door; 104. Control panel; 2. Feeding mechanism; 201. Material cylinder; 202. Screw conveyor; 3. Mechanical protection mechanism; 301. Slot; 302. Slide groove; 303. Fixed rod; 304. Connecting rod; 305. Control rod. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] according to Figure 1 As shown in Figure 4, this utility model provides a safety protection device for a plastic injection molding machine, including a molding machine body 1 and a feeding mechanism 2. The molding machine body 1 is controlled by a control panel 104 located on one side of the front of the molding machine body 1. The feeding mechanism 2 includes a material cylinder 201, one side of which is connected to a screw conveyor 202 at the lower end of the material cylinder 201. The end of the screw conveyor 202 is connected to a fixed mold 101. In this way, the control panel 104 can control the material cylinder 201 to heat the raw material, and then extend the hydraulic rod to close the fixed mold 101 and the moving mold 102. Then, the screw conveyor 202 can be started to transport the heated raw material into the fixed mold 101 to realize the molding operation.

[0021] according to Figure 1 , 2 As shown in Figures 3 and 4: The molding machine body 1 has a fixed mold 101 at one end and a moving mold 102 driven by a hydraulic rod at the other end. A protective door 103 is provided on the front of the molding machine body 1. A mechanical protection mechanism 3 is provided on the molding machine body 1 to control and fix the position of the moving mold 102 via the protective door 103. The mechanical protection mechanism 3 includes a slot 301 located at the lower end of the moving mold 102, a slide groove 302 located below the slot 301 on the molding machine body 1, a fixed rod 303 that slides vertically within the slide groove 302 and the slot 301, and a rod that slides forward and backward below the slide groove 302. A connecting rod 304 that pushes the fixed rod 303 up and down is provided on one side of the protective door 103 and a control rod 305 that pushes the connecting rod 304 when it is opened; in this way, when the protective door 103 is opened, the control rod 305 will push the connecting rod 304 to move, and the connecting rod 304 will push the fixed rod 303 to move. By fixing the fixed rod 303 in the slide groove 302 and slot 301, the position of the moving mold 102 is fixed. When the protective door 103 is closed, it will drive the control rod 305 to reset. Under the action of gravity, the fixed rod 303 will descend and then push the connecting rod 304 to reset.

[0022] according to Figure 1 , 2 As shown: The molding machine body 1 is equipped with an electrical protection mechanism to disconnect the power to the molding machine body 1; the electrical protection mechanism includes an electrical safety lock installed inside the molding machine body 1, the electrical safety lock is connected to the control panel 104, when the protective door 103 is closed, the electrical safety lock is closed, the molding machine body 1 operates normally, when the protective door 103 is opened, the electrical safety lock is opened, and the operating circuit of the molding machine body 1 is disconnected; thus, when the protective door 103 is opened, the circuit of the molding machine body 1 will be disconnected.

[0023] according to Figure 1 ,2 As shown: The molding machine body 1 is equipped with a hydraulic protection mechanism that interrupts the hydraulic circuit of the hydraulic press; the hydraulic protection mechanism includes a hydraulic safety valve installed on the hydraulic oil circuit of the hydraulic press. When the protection door 103 is closed, the hydraulic safety valve is not pressed, and the hydraulic oil circuit of the hydraulic press is normal. When the protection door 103 is opened, the hydraulic safety valve is pressed, interrupting the hydraulic circuit and causing the hydraulic oil to drain back to the hydraulic oil tank; thus, when the protection door 103 is opened, the hydraulic oil circuit of the molding machine body 1 will be disconnected, thereby preventing the moving mold 102 from moving.

[0024] The principle of this utility model is as follows: In use, the material cylinder 201 is first heated by the control panel 104. Then, the hydraulic rod is extended to close the fixed mold 101 and the moving mold 102. Next, the screw conveyor 202 is started to transport the heated material into the fixed mold 101 to realize the molding operation. After the product is formed, the protective door 103 is opened to take out the product. The protective door 103 will drive the control rod 305 to move, the control rod 305 will push the connecting rod 304 to move, and the connecting rod 304 will push the fixed rod 303 to move. By making the fixed rod 303 in the slide groove 30 The position of the moving mold 102 is fixed within the slot 301. At the same time, the circuit of the molding machine body 1 and the hydraulic oil circuit of the molding machine body 1 are disconnected, thus preventing the moving mold 102 from moving. This ensures a high level of safety for the molding machine body 1. After the product is removed, the protective door 103 is closed. The protective door 103 will drive the control rod 305 to reset. Under the action of gravity, the fixing rod 303 will descend and then push the connecting rod 304 to reset. At the same time, the circuit of the molding machine body 1 and the hydraulic oil circuit of the molding machine body 1 will be connected, thus enabling the device to operate normally.

[0025] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A safety protection device for a plastic injection molding machine, comprising a molding machine body (1) and a feeding mechanism (2); characterized in that: The molding machine body (1) has a fixed mold (101) at one end and a moving mold (102) driven by a hydraulic rod at the other end. The molding machine body (1) has a protective door (103) on its front side. The molding machine body (1) is equipped with a mechanical protection mechanism (3) that controls and fixes the position of the moving mold (102) through the protective door (103), an electrical protection mechanism that cuts off the power to the molding machine body (1), and a hydraulic protection mechanism that interrupts the hydraulic circuit of the hydraulic press.

2. The safety protection device for a plastic injection molding machine according to claim 1, characterized in that: The molding machine body (1) is controlled by a control panel (104) located on one side of the front of the molding machine body (1).

3. The safety protection device for a plastic injection molding machine according to claim 1, characterized in that: The feeding mechanism (2) includes a material cylinder (201) and a screw conveyor (202) connected to the lower end of the material cylinder (201) on one side. The end of the screw conveyor (202) is connected to the fixed mold (101).

4. The safety protection device for a plastic injection molding machine according to claim 1, characterized in that: The mechanical protection mechanism (3) includes a slot (301) located at the lower end of the moving mold (102), a slide groove (302) located below the slot (301) on the molding machine body (1), a fixed rod (303) slidably disposed in the slide groove (302) and the slot (301), a connecting rod (304) slidably disposed at the lower part of the slide groove (302) and pushing the fixed rod (303) to move up and down, and a control rod (305) located on one side of the protective door (103) and pushing the connecting rod (304) when opened.

5. A safety protection device for a plastic injection molding machine according to claim 2, characterized in that: The electrical protection mechanism includes an electrical safety lock installed inside the molding machine body (1). The electrical safety lock is connected to the control panel (104). When the protective door (103) is closed, the electrical safety lock is closed and the molding machine body (1) operates normally. When the protective door (103) is opened, the electrical safety lock is opened and the operating circuit of the molding machine body (1) is disconnected.

6. The safety protection device for a plastic injection molding machine according to claim 2, characterized in that: The hydraulic protection mechanism includes a hydraulic safety valve installed on the hydraulic oil circuit of the hydraulic press. When the protection door (103) is closed, the hydraulic safety valve is not pressed and the hydraulic oil circuit of the hydraulic press is normal. When the protection door (103) is opened, the hydraulic safety valve is pressed to interrupt the hydraulic circuit and allow the hydraulic oil to drain back to the hydraulic oil tank.

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