Safety device of safety door of injection molding machine

Abstract

The utility model provides an injection molding machine safety door safety device which comprises a cylinder, the cylinder comprises a piston rod and a piston, and the piston rod stretches out and draws back to prevent a safety door from being closed or separated from the safety door. When the safety door is closed, the piston rod abuts against the safety door under the elastic action of the spring, and the piston is located in the middle of the air cylinder body. When the safety door is opened, the piston rod extends out under the driving action of the spring to stop the safety door from being closed. Due to the position arrangement of the piston, the enough extending distance of the piston rod is provided, and when the safety door is closed, the spring is in a compressed state; when the safety door is opened, the piston rod stably extends out under the action of the elastic force of the spring; when the safety door is in the abnormal closing motion state, the piston rod is in the extending state, the position is stable, closing of the safety door can be stopped, and therefore potential safety hazards caused by mistaken closing of the safety door are eliminated; in addition, compared with a traditional electromagnetic locking device, the cost is lower due to the arrangement of the air cylinder.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding machines, in particular to a safety door insurance device for an injection molding machine. Background Art

[0002] There are generally two types of safety doors for injection molding machines, either manual doors or automatic doors. When the staff needs to operate, the safety door will be opened. In order to prevent the safety door from closing due to misoperation or failure, causing safety accidents, a safety pin will be installed on the injection molding machine. When the safety door is open, it will extend to block the safety door and prevent it from closing.

[0003] Safety pins generally use electromagnetic locking devices, which are not only costly but also have the risk of failure, resulting in low safety. Utility Model Content

[0004] In order to solve the technical problems in the background technology, the utility model discloses a safety door safety device for an injection molding machine.

[0005] The utility model provides a safety door safety device for an injection molding machine, comprising a cylinder, wherein the cylinder comprises a piston rod and a piston, and the piston rod is extended and retracted to prevent the safety door from closing or detaching from the safety door;

[0006] When the safety door is closed, the piston rod abuts against the safety door under the elastic force of the spring, and the piston is located in the middle position of the cylinder body;

[0007] When the safety door is opened, the piston rod extends out under the driving action of the spring to prevent the safety door from closing.

[0008] The position setting of the piston provides sufficient extension distance for the piston rod, and when the safety door is closed, the spring is in a compressed state; when the safety door is opened, the piston rod is stably extended under the action of the spring force; when the safety door is in an abnormal closing movement state, the piston rod is in an extended state and the position is stable, which can prevent the safety door from closing, thereby eliminating the safety hazard caused by the accidental closing of the safety door; furthermore, the setting of the cylinder is lower in cost than the traditional electromagnetic locking device.

[0009] The installation position of the spring directly affects the cost of the cylinder. Based on this, a further improvement is that the spring is installed in the rodless cavity of the cylinder; the air source is connected only to the rod cavity of the cylinder through the air pipe.

[0010] If the rodless chamber is closed, when the spring drives the piston rod to extend, negative pressure will be formed in the rodless chamber, thereby causing resistance to the extension of the piston rod. Based on this, a further improvement is that the rodless chamber is provided with an air hole that is connected to the outside world to keep the air pressure in the rodless chamber stable.

[0011] The setting of the air hole will generate a large noise. Based on this, a further improvement is that a first muffler is connected to the air hole.

[0012] The specific structure of the rod chamber to achieve intake and exhaust switching is: a two-position three-way valve is connected to the air pipe, which is used for intake or exhaust of the rod chamber; a second muffler is installed at the exhaust port of the two-position three-way valve. Since the gas will cause noise when it is discharged from the exhaust port of the two-position three-way valve, the second muffler can reduce the noise.

[0013] Since the cylinder only needs to block the closing of the safety door, the cylinder model is smaller and only requires a pressure of 3-4 bar; since the conventional gas source pressure used in the workshop is 8-10 bar, for the cylinder, excessive pressure will cause damage to the cylinder. Based on this, the further design is: a pressure reducing valve is also installed on the air pipe; the pressure reducing valve is located between the two-position three-way valve and the gas source, and is used to reduce the intake pressure of the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0015] Figure 1 It is a schematic diagram of the installation structure of the utility model;

[0016] Figure 2 yes Figure 1 Enlarged view of point E in the middle;

[0017] Figure 3 It is the principle diagram of the utility model;

[0018] Figure 4 It is a principle diagram of the utility model, wherein the safety door is in an open state;

[0019] Figure 5 It is a principle diagram of the utility model, wherein the safety door is in a state before closing;

[0020] In the figure: 1. Cylinder; 2. Piston rod; 3. Piston; 4. Safety door; 5. Spring; 6. Air pipe; 7. First muffler; 8. Two-position three-way valve; 9. Second muffler; 10. Pressure reducing valve; 11. Rodless chamber; 12. Rod chamber. DETAILED DESCRIPTION

[0021] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0022] Embodiment 1:

[0023] The utility model discloses a safety door safety device for an injection molding machine, comprising a cylinder 1, such as Figure 1 and Figure 2 As shown, it is installed at the lower side of the safety door 4 of the injection molding machine.

[0024] The cylinder 1 includes a piston rod 2 and a piston 3, and the inner cavity is provided with a rod chamber 12 and a rodless chamber 11. The rod chamber 12 is connected to the air source through an air pipe 6. A two-position three-way valve 8 is installed on the air pipe 6, and the rod chamber 12 is switched to realize air intake or exhaust. A second muffler 9 is installed at the exhaust port of the two-position three-way valve 8 to reduce the noise generated during exhaust. A spring 5 is installed in the rodless chamber 11, and its two ends respectively abut against the piston 3 and the bottom of the cylinder 1, and its restoring force is used to drive the piston rod 2 to extend and prevent the safety door 4 from closing. When the rod chamber 12 is inhaled, the piston rod 2 retracts.

[0025] The rodless chamber 11 is provided with an air hole, which is communicated with the outside world to keep the air pressure stable in the rodless chamber 11. The air hole is connected to a first muffler 7 to reduce the noise generated when the air hole is exhausted.

[0026] When the safety door 4 is closed, Figure 3 As shown, the piston rod 2 abuts against the safety door 4 under the elastic force of the spring 5, and the piston 3 is located in the middle position of the cylinder body of the cylinder 1; when the safety door 4 is opened, as shown in FIG. Figure 4 As shown, the piston rod 2 extends under the driving action of the spring 5 to prevent the safety door 4 from closing; when the safety door 4 needs to be closed, air enters the rod chamber 12 and the piston rod 2 retracts; when the safety door 4 is closed, as shown in FIG. Figure 4 As shown, the air source stops supplying air to the rod chamber 12, the elastic force of the spring 5 drives the piston rod 2 to reset, and the rod chamber 12 is exhausted, and finally becomes Figure 3 state.

[0027] The position setting of the piston 3 provides a sufficient extension distance for the piston rod 2, and when the safety door 4 is closed, the spring 5 is in a compressed state; when the safety door 4 is opened, the piston rod 2 is stably extended under the action of the elastic force of the spring 5; when the safety door 4 is in an abnormal closing movement state, the piston rod 2 is in an extended state and has a stable position, which can prevent the safety door 4 from closing, thereby eliminating the safety hazard caused by the accidental closing of the safety door 4; furthermore, the setting of the cylinder 1 is lower in cost than the traditional electromagnetic locking device.

[0028] The installation structure of the spring 5 makes the structure of the utility model simpler, more compact and has lower manufacturing cost.

[0029] The cylinder 1 is installed at the lower end of the safety door 4, which will not hinder the workers' operation, thereby facilitating the workers to install the mold.

[0030] Embodiment 2:

[0031] Compared with the first embodiment, the difference is: since the cylinder 1 only needs to block the closing of the safety door 4, the model of the cylinder 1 is smaller and only requires a pressure of 3-4 bar; since the gas source pressure commonly used in the workshop is 8-10 bar, for the cylinder 1, the pressure is too high and will cause damage to the cylinder 1, so the following design is made: a pressure reducing valve 10 is also installed on the air pipe 6; the pressure reducing valve 10 is located between the two-position three-way valve 8 and the gas source, and is used to reduce the intake pressure of the cylinder 1.

[0032] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A safety door safety device for an injection molding machine, characterized in that: The cylinder (1) comprises a piston rod (2) and a piston (3), and the piston rod (2) is extended and retracted to prevent the safety door (4) from closing or to disengage from the safety door (4); When the safety door (4) is closed, the piston rod (2) abuts against the safety door (4) under the elastic force of the spring (5), and the piston (3) is located in the middle position of the cylinder body (1); When the safety door (4) is opened, the piston rod (2) is extended under the driving action of the spring (5) to prevent the safety door (4) from closing.

2. The safety door safety device for an injection molding machine according to claim 1, characterized in that: The spring (5) is installed in the rodless chamber (11) of the cylinder (1); The air source is connected only to the rod chamber (12) of the cylinder (1) through an air pipe (6).

3. The safety door safety device for an injection molding machine according to claim 2, characterized in that: The rodless chamber (11) is provided with an air hole which is in communication with the outside world, so as to keep the air pressure in the rodless chamber (11) stable.

4. The safety door safety device for an injection molding machine according to claim 3, characterized in that: The air hole is connected to a first silencer (7).

5. The safety door safety device for an injection molding machine according to claim 2, characterized in that: The air pipe (6) is connected to a two-position three-way valve (8) for air intake or exhaust of the rod chamber (12); The exhaust port of the two-position three-way valve (8) is equipped with a second muffler (9).

6. The safety door safety device for an injection molding machine according to claim 5, characterized in that: The air pipe (6) is also provided with a pressure reducing valve (10); The pressure reducing valve (10) is located between the two-position three-way valve (8) and the gas source.

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