Injection molding machine door and mold opening oil circuit system and injection molding machine

Abstract

The invention discloses an injection molding machine door opening and mold opening oil circuit system and an injection molding machine, belonging to the technical field of injection molding machines. The invention comprises a mold clamping oil cylinder and a mold shifting valve, wherein the mold shifting valve can control the pressure oil to enter the rod chamber or rodless chamber of the mold clamping oil cylinder, and further comprises a safety valve and a directional valve, wherein the mold shifting valve is connected to the oil pump through the safety valve, wherein the safety valve can control the connection and disconnection between the mold shifting valve and the oil pump, and the safety valve is connected to the travel switch of the safety door of the injection molding machine in communication; when the safety door of the injection molding machine is opened, the safety valve is powered off, and the connection between the mold shifting valve and the oil pump is disconnected; when the safety door of the injection molding machine is closed, the safety valve is powered on, and the mold shifting valve is connected to the oil pump; the rod chamber of the mold clamping oil cylinder is connected to the oil pump through the directional valve, and the directional valve can control the connection and disconnection between the rod chamber of the mold clamping oil cylinder and the oil pump. A safety valve with position monitoring is used to realize the door opening and locking function; at the same time, a directional valve is connected in parallel next to the safety valve to realize the door opening and mold opening function, which has simple structure, safety and reliability, and strong versatility.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding machines, and in particular to an injection molding machine door and mold opening oil circuit system and an injection molding machine. Background Art

[0002] As a special mechanical equipment, the injection molding machine must have electrical safety devices, mechanical safety devices, and hydraulic safety devices for working safety. In the production process of the injection molding machine, the mold opening and closing process is the stage where safety accidents are most likely to occur. When the front and rear safety doors are open, it is strictly forbidden to close the mold to prevent people from being pinched, but the mold opening action can be realized.

[0003] The traditional hydraulic safety device is to set a cam valve under the safety door. When the safety door is open, the cam valve is driven by the mechanical structure to cut off the pilot oil of the mold clamping valve, thereby realizing the safety function of door opening and locking. This hydraulic safety device has poor reliability, complex structure and severe mechanical wear. Summary of the invention

[0004] The object of the present invention is to provide an injection molding machine door and mold opening oil circuit system and an injection molding machine, which can realize the door opening and locking function and the door and mold opening function, have a simple structure, are safe and reliable, and have strong versatility.

[0005] In order to achieve the above objectives, the following technical solutions are provided:

[0006] An injection molding machine door and mold opening oil circuit system, comprising a mold clamping oil cylinder and a mold shifting valve, wherein the mold shifting valve can control the pressure oil to enter the rod chamber or the rodless chamber of the mold clamping oil cylinder, and is characterized in that it also includes:

[0007] A safety valve, the mold shifting valve is connected to the oil pump through the safety valve, the safety valve can control the connection and disconnection between the mold shifting valve and the oil pump, and the safety valve is communicatively connected to the travel switch of the safety door of the injection molding machine; when the safety door of the injection molding machine is opened, the safety valve is powered off, and the connection between the mold shifting valve and the oil pump is disconnected; when the safety door of the injection molding machine is closed, the safety valve is powered on, and the mold shifting valve is connected to the oil pump;

[0008] A directional valve, wherein the rod chamber of the mold clamping cylinder is connected to the oil pump through the directional valve, and the directional valve can control the connection and disconnection between the rod chamber of the mold clamping cylinder and the oil pump.

[0009] Optionally, the A port and the P port of the safety valve are both connected to the oil pump, and the B port and the T port of the safety valve are both connected to the P port of the mold shifting valve.

[0010] Optionally, the A port and the P port of the directional valve are both connected to the oil pump, and the B port and the T port of the directional valve are both connected to the rod chamber of the mold clamping cylinder.

[0011] Optionally, the A port of the mold shifting valve is communicated with the rod chamber of the mold clamping cylinder, and the B port of the mold shifting valve is communicated with the rodless chamber of the mold clamping cylinder.

[0012] Optionally, the oil circuit system further includes a first oil return branch and a second oil return branch connected in parallel, and the T port of the mold shifting valve is connected to the oil tank through the first oil return branch and the second oil return branch respectively.

[0013] Optionally, a differential valve is provided on the first oil return branch, the T port of the mold shifting valve is connected to the P port and the B port of the differential valve, and the A port and the T port of the differential valve are both connected to the oil tank.

[0014] Optionally, a quick valve is provided on the second oil return branch, the T port of the mold shifting valve is connected to the A port of the quick valve, the B port and T port of the quick valve are both connected to the oil tank, and the P port of the quick valve is connected to the rodless chamber of the mold clamping cylinder.

[0015] Optionally, a damper is provided on the oil circuit between the T-port of the quick valve and the oil tank.

[0016] Optionally, the quick valve is a three-position four-way reversing valve, and when the quick valve is in a middle position, its A port is connected to T port.

[0017] An injection molding machine comprises an injection molding machine body and the above-mentioned injection molding machine door and mold opening oil circuit system.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The door opening and mold opening oil circuit system of the injection molding machine of the present invention comprises a mold clamping oil cylinder and a mold shifting valve, wherein the mold shifting valve can control the pressure oil to enter the rod chamber or the rodless chamber of the mold clamping oil cylinder, and further comprises a safety valve and a directional valve, wherein the mold shifting valve is connected to the oil pump through the safety valve, wherein the safety valve can control the connection and disconnection between the mold shifting valve and the oil pump, and the safety valve is connected to the travel switch of the safety door of the injection molding machine; when the safety door of the injection molding machine is opened, the safety valve is powered off, and the connection between the mold shifting valve and the oil pump is disconnected; when the safety door of the injection molding machine is closed, the safety valve is powered on, and the mold shifting valve is connected to the oil pump; the rod chamber of the mold clamping oil cylinder is connected to the oil pump through the directional valve, and the directional valve can control the connection and disconnection between the rod chamber of the mold clamping oil cylinder and the oil pump. A safety valve with position monitoring is adopted, and the safety valve is arranged before the oil inlet of the mold shifting valve, and the safety valve is driven to be connected and disconnected through the travel switch of the safety door, thereby realizing the function of door opening and locking. At the same time, a directional valve is connected in parallel next to the safety valve to realize the door opening and mold opening function, which has simple structure, safety and reliability, and strong versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a hydraulic principle diagram of the door and mold opening oil circuit system of the injection molding machine in an embodiment of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the door and mold opening oil circuit system of the injection molding machine in an embodiment of the present invention;

[0022] Figure 3 This is a structural schematic diagram from another perspective of the door and mold opening oil circuit system of the injection molding machine in an embodiment of the present invention.

[0023] Reference numerals:

[0024] 100, mold clamping cylinder; 101, rod chamber; 102, rodless chamber;

[0025] 1. Mold shifting valve; 2. Safety valve; 3. Directional valve; 4. Differential valve; 5. Quick valve; 6. Damping. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or are the positions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0030] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0033] like Figure 1-3 As shown, the present embodiment provides an injection molding machine door and mold opening oil circuit system, comprising a mold clamping cylinder 100 and a mold shifting valve 1, wherein the mold shifting valve 1 can control the pressure oil to enter the rod chamber 101 or the rodless chamber 102 of the mold clamping cylinder 100, and further comprises a safety valve 2 and a directional valve 3, wherein the mold shifting valve 1 is connected to the oil pump through the safety valve 2, the safety valve 2 can control the connection and disconnection between the mold shifting valve 1 and the oil pump, and the safety valve 2 is communicatively connected to the travel switch of the safety door of the injection molding machine; when the safety door of the injection molding machine is opened, the safety valve 2 is powered off, and the connection between the mold shifting valve 1 and the oil pump is cut off; when the safety door of the injection molding machine is closed, the safety valve 2 is powered on, and the mold shifting valve 1 is connected to the oil pump; the rod chamber 101 of the mold clamping cylinder 100 is connected to the oil pump through the directional valve 3, and the directional valve 3 can control the connection and disconnection between the rod chamber 101 of the mold clamping cylinder 100 and the oil pump.

[0034] Further, the port A of the mold shifting valve 1 is communicated with the rod chamber 101 of the mold clamping cylinder 100 , and the port B of the mold shifting valve 1 is communicated with the rodless chamber 102 of the mold clamping cylinder 100 .

[0035] Furthermore, the A port and the P port of the safety valve 2 are both connected to the oil pump, and the B port and the T port of the safety valve 2 are both connected to the P port of the mold shifting valve 1 .

[0036] Furthermore, the A port and the P port of the directional valve 3 are both connected to the oil pump, and the B port and the T port of the directional valve 3 are both connected to the rod chamber 101 of the mold clamping cylinder 100 .

[0037] Furthermore, the oil circuit system further includes a first oil return branch and a second oil return branch connected in parallel, and the T port of the mold shifting valve 1 is connected to the oil tank through the first oil return branch and the second oil return branch respectively.

[0038] Specifically, a differential valve 4 is provided on the first oil return branch line, the T port of the mold shift valve 1 is connected to the P port and the B port of the differential valve 4, and the A port and the T port of the differential valve 4 are both connected to the oil tank. A quick valve 5 is provided on the second oil return branch line, the T port of the mold shift valve 1 is connected to the A port of the quick valve 5, the B port and the T port of the quick valve 5 are both connected to the oil tank, and the P port of the quick valve 5 is connected to the rodless chamber 102 of the mold clamping cylinder 100. Specifically, the quick valve 5 is a three-position four-way reversing valve, and when the quick valve 5 is in the middle position, its A port is connected to the T port.

[0039] Furthermore, a damper 6 is provided on the oil path between the T port of the quick valve 5 and the oil tank.

[0040] In this embodiment, the injection molding machine is also provided with an alarm, which is communicatively connected to the safety valve 2. Specifically, the injection molding machine computer is electrically connected to the alarm and the safety valve 2, respectively, and when the injection molding machine computer detects that the safety valve 2 is powered off, the alarm is controlled to send an alarm signal.

[0041] The functions that the injection molding machine can achieve are as follows:

[0042] Function of prohibiting mold closing when the door is open: when the safety door of the injection molding machine is opened, the travel switch set under the safety door is squeezed, causing the safety valve 2 to be powered off. After the injection molding machine computer detects the feedback signal of the safety valve 2, it prompts the operator that the safety door is open and the mold cannot be closed. At the same time, the alarm is triggered and an alarm signal is issued.

[0043] Door closing and mold clamping function: When the safety door of the injection molding machine is closed, the travel switch set under the safety door is released, the safety valve 2 is energized (that is, S7 is energized), and the pressure oil reaches the P port of the mold shifting valve 1 through the safety valve 2. When the electromagnet S1 is energized, the mold shifting valve 1 enters the work position from the left position, and the pressure oil flows from the P port of the mold shifting valve 1 to the B port and enters the rodless chamber 102 of the mold clamping cylinder 100. At the same time, the oil in the rod chamber 101 flows back to the oil tank from the A port of the mold shifting valve 1 to the T port. Under the action of the pressure oil, the mold clamping cylinder 100 performs the mold clamping action.

[0044] Door and mold opening function: When the safety door of the injection molding machine is opened, the travel switch set under the safety door is squeezed, so that the safety valve 2 is de-energized, and the computer program of the injection molding machine does not detect the signal of the safety valve 2. At this time, the pressure oil cannot reach the P port of the mold shifting valve 1 through the safety valve 2. If the mold opening action is to be performed, the electromagnets S2 and S6 are energized, and the pressure oil passes through the A and P ports of the directional valve 3, and then enters the rod chamber 101 of the mold clamping cylinder 100 through its B and T ports. At the same time, the oil in the rodless chamber 102 flows from the B port of the mold shifting valve 1 to the T port and enters the oil tank. Under the action of the pressure oil, the rod chamber 101 performs the mold opening action.

[0045] Quick mold opening function: When opening the mold, the electromagnets S2 and S4 are energized, and the pressure oil enters the rod chamber 101. The oil in the rodless chamber 102 flows back to the oil tank through the T port of the mold shifting valve 1 and then through the PB channel of the differential valve 4 and the quick valve 5, thereby increasing the return oil channel, reducing the return oil resistance, and increasing the mold opening speed.

[0046] The quick valve 5 and the damping 6 work together to realize the mold opening back pressure function and the mold closing deceleration function: in the first stage of mold opening, the mold is separated. At this time, in order to prevent the mold from being damaged by too fast speed, the mold needs to be opened at a low speed. When the mold is completely separated, the mold is opened quickly. Therefore, in the first stage of mold opening, the mold opening back pressure is increased by the damping 6. At this time, the electromagnets S2 and S3 are energized, and the pressure oil enters the rod chamber 101. The oil in the rodless chamber 102 passes through the T port of the mold shifting valve 1, and then passes through the T port of the quick valve 5, and then passes through the damping 6 and flows back to the oil tank. Due to the throttling effect of the damping hole, back pressure will be generated in the rodless chamber 102, realizing the mold opening back pressure function. When the mold closing enters the last stage, the molds begin to contact, and it still needs to proceed slowly. The electromagnets S1 and S3 are energized, and the pressure oil enters the rodless chamber 102. The oil in the rod chamber 101 passes through the T port of the mold shifting valve 1, and then passes through the T port of the quick valve 5, and then flows into the oil tank through the damping 6. At this time, the throttling back pressure of the damping 6 is generated in the rod chamber 101 of the cylinder, realizing the mold closing deceleration function.

[0047] When the differential valve 4 and the quick valve 5 work together, the ultra-fast mold closing function can be realized: during ultra-fast mold closing, the electromagnets S1, S3, and S5 are energized, and the pressure oil enters the rodless chamber 102. After the oil in the rod chamber 101 passes through the T port of the mold shifting valve 1, it enters the rodless chamber 102 again through the AP channel of the quick valve 5, forming a differential circuit to realize the ultra-fast mold closing function.

[0048] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An injection molding machine door and mold opening oil circuit system, comprising a mold clamping cylinder (100) and a mold shifting valve (1), wherein the mold shifting valve (1) is capable of controlling the pressure oil to enter a rod chamber (101) or a rodless chamber (102) of the mold clamping cylinder (100), characterized in that: Also includes: A safety valve (2), the mold shifting valve (1) is connected to the oil pump through the safety valve (2), the safety valve (2) can control the connection and disconnection between the mold shifting valve (1) and the oil pump, and the safety valve (2) is communicatively connected to the travel switch of the safety door of the injection molding machine; when the safety door of the injection molding machine is opened, the safety valve (2) is powered off, disconnecting the connection between the mold shifting valve (1) and the oil pump; when the safety door of the injection molding machine is closed, the safety valve (2) is powered on, and the mold shifting valve (1) is connected to the oil pump; A directional valve (3), wherein the rod chamber (101) of the mold clamping oil cylinder (100) is connected to the oil pump through the directional valve (3), and the directional valve (3) can control the connection and disconnection between the rod chamber (101) of the mold clamping oil cylinder (100) and the oil pump; The A port of the mold shifting valve (1) is in communication with the rod chamber (101) of the mold clamping cylinder (100), and the B port of the mold shifting valve (1) is in communication with the rodless chamber (102) of the mold clamping cylinder (100); The oil circuit system further comprises a first oil return branch and a second oil return branch connected in parallel, and the T port of the mold shifting valve (1) is connected to the oil tank through the first oil return branch and the second oil return branch respectively; A differential valve (4) is provided on the first oil return branch line, the T port of the mold shifting valve (1) is connected to the P port and the B port of the differential valve (4), and the A port and the T port of the differential valve (4) are both connected to the oil tank; A quick valve (5) is provided on the second oil return branch line, the T port of the mold shifting valve (1) is connected to the A port of the quick valve (5), the B port and the T port of the quick valve (5) are both connected to the oil tank, and the P port of the quick valve (5) is connected to the rodless chamber (102) of the mold clamping cylinder (100).

2. The door and mold opening oil circuit system of the injection molding machine according to claim 1, characterized in that: The A port and the P port of the safety valve (2) are both connected to the oil pump, and the B port and the T port of the safety valve (2) are both connected to the P port of the mold shifting valve (1).

3. The door and mold opening oil circuit system of the injection molding machine according to claim 1, characterized in that: The A port and the P port of the directional valve (3) are both connected to the oil pump, and the B port and the T port of the directional valve (3) are both connected to the rod chamber (101) of the mold clamping cylinder (100).

4. The door and mold opening oil circuit system of the injection molding machine according to claim 1, characterized in that: A damper (6) is provided on the oil path between the T port of the quick valve (5) and the oil tank.

5. The door and mold opening oil circuit system of the injection molding machine according to claim 1, characterized in that: The quick valve (5) is a three-position four-way reversing valve. When the quick valve (5) is in the middle position, its A port is connected to its T port.

6. An injection molding machine, comprising an injection molding machine body, characterized in that: It also includes the door and mold opening oil circuit system of the injection molding machine according to any one of claims 1 to 5.

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