Mould locking hydraulic oil way, mould locking mechanism and high-speed packaging machine

Abstract

The utility model discloses a mould locking hydraulic oil circuit, mould locking mechanism and high-speed packing machine, mould locking hydraulic oil circuit includes: main mould locking module including oil pump, mould locking oil cylinder, three-position four-way solenoid directional valve, first oil tank and second oil tank, the first oil tank is connected with the three-position four-way solenoid directional valve, the second oil tank is connected with the three-position four-way solenoid directional valve, the three-position four-way electromagnetic reversing valve is connected with the first cavity through a third oil way and connected with the second cavity through a fourth oil way. The auxiliary mold locking module comprises a cartridge valve and an electromagnetic control valve, the cartridge valve is arranged on the third oil way and divides the third oil way into a third front oil way and a third rear oil way, the cartridge valve is connected with the three-position four-way electromagnetic directional valve through the third front oil way, and the cartridge valve is connected with the first cavity through the third rear oil way; a control oil port of the cartridge valve is connected with the electromagnetic control valve through a fifth oil way, and the electromagnetic control valve is connected with the third rear oil way through a sixth oil way. The holding time of hydraulic oil pressure of the mold locking oil cylinder is effectively prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection molding, and particularly relates to a mold locking hydraulic oil circuit, a mold locking mechanism and a high-speed packaging machine. Background Art

[0002] High-speed packaging machines operate at high injection speeds and pressures. During injection, the plastic exerts a significant expanding force within the mold, pushing it open. Existing high-speed packaging machines typically use an O-type reversing slide valve to control mold opening and closing. After the mold is closed and locked, the oil pump stops supplying oil, and the O-type reversing slide valve returns to its neutral position. Due to the characteristics of the slide valve, leakage is inevitable, causing a drop in pressure within the clamping cylinder. This pressure drop allows the plastic to exert an expanding force that can push the mold open, resulting in defects such as flash on the finished product. Therefore, improvements to the existing clamping hydraulic circuit are necessary. Utility Model Content

[0003] In order to solve the above technical problems, the purpose of the present utility model is to provide a clamping hydraulic oil circuit, a clamping mechanism and a high-speed packaging machine, which effectively extend the holding time of the hydraulic oil pressure of the clamping cylinder through the cartridge valve.

[0004] In order to achieve the above-mentioned purpose of the utility model, the technical solution adopted by the utility model is as follows:

[0005] In a first aspect of the present invention, the present invention provides a clamping hydraulic oil circuit, comprising:

[0006] The main clamping module includes an oil pump, a clamping cylinder, a three-position four-way solenoid reversing valve, a first oil tank, and a second oil tank. The first oil tank is connected to the three-position four-way solenoid reversing valve via a first oil circuit. The oil pump is provided on the first oil circuit. The second oil tank is connected to the three-position four-way solenoid reversing valve via a second oil circuit. The three-position four-way solenoid reversing valve is connected to the first cavity of the clamping cylinder via a third oil circuit and to the second cavity of the clamping cylinder via a fourth oil circuit.

[0007] The auxiliary clamping module includes a cartridge valve and an electromagnetic control valve. The cartridge valve is arranged on the third oil circuit, dividing the third oil circuit into a third front oil circuit and a third rear oil circuit. The third front oil circuit connects the first oil port of the cartridge valve with the three-position four-way electromagnetic reversing valve, and the third rear oil circuit connects the second oil port of the cartridge valve with the first cavity of the clamping cylinder. The control oil port of the cartridge valve is connected to the electromagnetic control valve through the fifth oil circuit, and the electromagnetic control valve is connected to the third rear oil circuit through the sixth oil circuit.

[0008] Preferably, the electromagnetic control valve is a two-position four-way electromagnetic directional control valve, and the fifth oil circuit and the sixth oil circuit are both connected to the two-position four-way electromagnetic directional control valve.

[0009] More preferably, the auxiliary clamping module further includes a third oil tank, and the third oil tank is connected to the two-position four-way electromagnetic reversing valve via a seventh oil circuit.

[0010] More preferably, the fifth oil circuit is provided with a pressure sensor for detecting the pressure of the fifth oil circuit.

[0011] More preferably, the seventh oil circuit is provided with a flow meter for detecting the flow of the hydraulic oil in the seventh oil circuit.

[0012] Preferably, one or more first oil ports are provided at the end of the first cavity of the locking cylinder away from the piston, and the one or more first oil ports are connected to the third rear oil circuit. One or more second oil ports are also provided at the end of the second cavity away from the piston, and the one or more second oil ports are connected to the fourth oil circuit.

[0013] In a second aspect of the present invention, the present invention provides a mold locking mechanism, comprising the above-mentioned mold locking hydraulic oil circuit.

[0014] In a third aspect of the present invention, the present invention provides a high-speed packaging machine, comprising the above-mentioned mold locking mechanism.

[0015] Beneficial effects:

[0016] The utility model adds an auxiliary clamping module, which cooperates with the main clamping module and effectively prolongs the holding time of the hydraulic oil pressure of the clamping cylinder through the plug-in valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shown is a schematic diagram of the present utility model.

[0018] Reference numerals: 1-first oil tank, 2-oil pump, 3-three-position four-way solenoid reversing valve, 4-second oil tank, 5-clamping cylinder, 6-first cavity, 7-second cavity, 8-mold, 9-cartridge valve, 10-two-position four-way solenoid reversing valve, 11-third oil tank;

[0019] 110-first oil circuit, 120-second oil circuit, 131-third front oil circuit, 132-third rear oil circuit, 140-fourth oil circuit, 150-fifth oil circuit, 160-sixth oil circuit, 170-seventh oil circuit. DETAILED DESCRIPTION

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without inventive work.

[0021] like Figure 1 The present invention proposes a clamping hydraulic oil circuit, including a main clamping module and an auxiliary clamping module, as follows:

[0022] The main clamping module includes an oil pump 2, a clamping cylinder 5, a three-position four-way solenoid reversing valve 3, a first oil tank 1, and a second oil tank 4. The first oil tank 1 is connected to the three-position four-way solenoid reversing valve 3 via a first oil circuit 110. The oil pump 2 is disposed on the first oil circuit 110. The second oil tank 4 is connected to the three-position four-way solenoid reversing valve 3 via a second oil circuit 120. The three-position four-way solenoid reversing valve 3 is connected to the first cavity 6 of the clamping cylinder 5 via a third oil circuit, and is connected to the second cavity 7 of the clamping cylinder 5 via a fourth oil circuit 140.

[0023] The auxiliary clamping module includes a cartridge valve 9 and an electromagnetic control valve. The cartridge valve 9 is arranged on the third oil circuit, dividing the third oil circuit into a third front oil circuit 131 and a third rear oil circuit 132. Among them, the third front oil circuit 131 connects the first oil port of the cartridge valve 9 to the three-position four-way electromagnetic reversing valve 3, and the third rear oil circuit 132 connects the second oil port of the cartridge valve 9 to the first cavity 6 of the clamping cylinder 5. The control oil port of the cartridge valve 9 is connected to the electromagnetic control valve through the fifth oil circuit 150, and the electromagnetic control valve is connected to the third rear oil circuit 132 through the sixth oil circuit 160.

[0024] Combine Figure 1 Taking the process of locking the mold 8 as an example, the method of using the utility model is as follows:

[0025] To lock mold 8, insert valve 9 connects the third front oil circuit 131 with the third rear oil circuit 132, effectively keeping the third oil circuit open. Activate the three-position, four-way solenoid directional valve 3, connecting the first oil circuit 110 with the third oil circuit and the second oil circuit 120 with the fourth oil circuit 140. Activate oil pump 2, pumping hydraulic oil from the first oil tank 1 into the first cavity 6 of the clamping cylinder 5, pushing the piston rightward to lock mold 8. The hydraulic oil in the second cavity 7 returns to the second oil tank 4 via the fourth oil circuit 140 and the second oil circuit 120.

[0026] After the mold 8 is locked, the electromagnetic control valve is activated, connecting the fifth oil circuit 150 with the sixth oil circuit 160. Hydraulic oil enters the control oil port of the cartridge valve 9 through the third rear oil circuit 132, the sixth oil circuit 160, and the fifth oil circuit 150, driving the cartridge valve 9 to close and disconnect the third front oil circuit 131 from the third rear oil circuit 132. At the same time, the three-position four-way electromagnetic reversing valve 3 is activated to disconnect the first oil circuit 110 from the third front oil circuit 131, and the oil pump 2 is turned off. The three-position four-way electromagnetic reversing valve 3 has leakage problems. The present utility model realizes automatic disconnection of the third oil circuit through the cartridge valve 9 and the electromagnetic control valve. The hydraulic oil in the third rear oil circuit 132 will not easily leak into the third front oil circuit 131, which will cause insufficient pressure in the clamping cylinder 5, thereby preventing the mold 8 from being stretched. Since the reaction force generated by the clamping cylinder 5 acts on the control port of the cartridge valve 9 through the hydraulic oil, the hydraulic oil in the third rear oil circuit 132 cannot flow back to the third front oil circuit 131 through the cartridge valve 9.

[0027] Mold 8 is opened: After injection molding is complete, the three-position, four-way solenoid directional valve 3 connects the first oil circuit 110 with the fourth oil circuit 140 and the third front oil circuit 131 with the second oil circuit 120. Simultaneously, the solenoid control valve disconnects the fifth oil circuit 150 from the sixth oil circuit 160 and drains the fifth oil circuit 150. During this process, the hydraulic oil that had previously entered the control port of the cartridge valve 9 is discharged through the fifth oil circuit 150, and the cartridge valve 9 resets, connecting the third front oil circuit 131 with the third rear oil circuit 132.

[0028] Start the oil pump 2, and the hydraulic oil enters the second cavity 7 of the clamping cylinder 5 through the first oil circuit 110 and the fourth oil circuit 140, pushing the piston to move left. The hydraulic oil in the first cavity 6 enters the second oil tank 4 through the third oil circuit and the second oil circuit 120 for recovery.

[0029] Furthermore, the electromagnetic control valve is a two-position four-way electromagnetic reversing valve 10, and the fifth oil circuit 150 and the sixth oil circuit 160 are both connected to the two-position four-way electromagnetic reversing valve 10. In the final stage of locking the mold 8, the two-position four-way electromagnetic reversing valve 10 controls the fifth oil circuit 150 and the sixth oil circuit 160 to be connected, and the fifth oil circuit 150 and the sixth oil circuit 160 are disconnected at other times.

[0030] Furthermore, the auxiliary clamping module includes a third oil tank 11, which is connected to the two-position four-way solenoid directional control valve 10 via a seventh oil passage 170. When the mold 8 is opened, the fifth oil passage 150 is connected to the seventh oil passage 170, and the hydraulic oil in the control port of the cartridge valve 9 flows through the fifth and seventh oil passages 150, 170 into the third oil tank 11 for recovery.

[0031] Furthermore, a pressure sensor is provided in the fifth oil circuit 150 for detecting the pressure of the fifth oil circuit 150. In the final stage of the process of locking the mold 8, after the two-position four-way solenoid reversing valve 10 controls the fifth oil circuit 150 to be connected with the sixth oil circuit 160, part of the hydraulic oil enters the control port of the cartridge valve 9. During this process, the pressure sensor detects the pressure inside the fifth oil circuit 150. After the three-position four-way solenoid reversing valve 3 disconnects the first oil circuit 110 from the third front oil circuit 131 and the oil pump 2 is turned off, the pressure is maintained at this time, and the pressure sensor detects whether the pressure inside the fifth oil circuit 150 is normal. Specifically, when the pressure sensor detects that the pressure inside the fifth oil circuit 150 decreases, it indicates that the cartridge valve 9 may have a fault, and there is a possibility that the third front oil circuit 131 and the third rear oil circuit 132 are connected. Therefore, the detection data of the pressure sensor can help staff detect faults in advance.

[0032] Furthermore, a flow meter is provided in the seventh oil passage 170 for detecting the flow rate of the hydraulic oil in the seventh oil passage 170. When the mold 8 is opened, the seventh oil passage 170 is connected to the fifth oil passage 150, and the flow meter can detect whether the hydraulic oil is discharged through the seventh oil passage 170. It is easy to understand that the oil pump 2 can be activated to discharge the hydraulic oil in the first cavity 6 only when the fifth oil passage 150 is connected to the seventh oil passage 170. Otherwise, the third rear oil passage 132 and the hydraulic cylinder may be damaged due to the inability to discharge the hydraulic oil.

[0033] Because the maximum amount of hydraulic oil in fifth oil circuit 150 and the control port of cartridge valve 9 is fixed, the flowmeter monitors the flow of hydraulic oil in seventh oil circuit 170 during mold 8 opening to determine whether cartridge valve 9 is fully open. For example, if the flowmeter detects a low flow of hydraulic oil in seventh oil circuit 170 during mold 8 opening, this indicates that cartridge valve 9 has not yet fully reset, connecting third front oil circuit 131 with third rear oil circuit 132. This allows staff to promptly identify and address the issue.

[0034] Furthermore, one or more first oil ports are provided at the end of the first cavity 6 of the locking cylinder 5 away from the piston, and the one or more first oil ports are connected to the third rear oil circuit 132. One or more second oil ports are also provided at the end of the second cavity 7 away from the piston, and the one or more second oil ports are connected to the fourth oil circuit 140, so as to facilitate rapid oil inflow or rapid oil outflow into or out of the first cavity 6 and the second cavity 7.

[0035] Based on the above-mentioned clamping hydraulic oil circuit, the utility model also proposes a corresponding clamping mechanism and a high-speed packaging machine, which effectively prolong the holding time of the hydraulic oil pressure of the clamping cylinder.

[0036] The embodiments provided by the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only intended to help understand the core concept of the present invention. It should be noted that, for those skilled in the art, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A clamping hydraulic oil circuit, characterized in that: include: A main clamping module comprises an oil pump (2), a clamping oil cylinder (5), a three-position four-way electromagnetic reversing valve (3), a first oil tank (1) and a second oil tank (4); the first oil tank (1) is connected to the three-position four-way electromagnetic reversing valve (3) via a first oil circuit (110); the oil pump (2) is arranged on the first oil circuit (110); the second oil tank (4) is connected to the three-position four-way electromagnetic reversing valve (3) via a second oil circuit (120); the three-position four-way electromagnetic reversing valve (3) is connected to the first cavity (6) of the clamping oil cylinder (5) via a third oil circuit, and is connected to the second cavity (7) of the clamping oil cylinder (5) via a fourth oil circuit (140); The auxiliary clamping module comprises a cartridge valve (9) and an electromagnetic control valve, wherein the cartridge valve (9) is arranged on a third oil circuit, dividing the third oil circuit into a third front oil circuit (131) and a third rear oil circuit (132), wherein the third front oil circuit (131) connects the first oil port of the cartridge valve (9) with a three-position four-way electromagnetic reversing valve (3), and the third rear oil circuit (132) connects the second oil port of the cartridge valve (9) with a first cavity (6) of a clamping cylinder (5). The control oil port of the cartridge valve (9) is connected to the electromagnetic control valve via a fifth oil circuit (150), and the electromagnetic control valve is connected to the third rear oil circuit (132) via a sixth oil circuit (160).

2. The clamping hydraulic oil circuit according to claim 1, characterized in that: The electromagnetic control valve is a two-position four-way electromagnetic directional control valve (10), and the fifth oil circuit (150) and the sixth oil circuit (160) are both connected to the two-position four-way electromagnetic directional control valve (10).

3. The clamping hydraulic oil circuit according to claim 2, characterized in that: The auxiliary clamping module further comprises a third oil tank (11), which is connected to a two-position four-way electromagnetic reversing valve (10) via a seventh oil circuit (170).

4. The clamping hydraulic oil circuit according to claim 1, characterized in that: The fifth oil circuit (150) is provided with a pressure sensor for detecting the pressure of the fifth oil circuit (150).

5. The clamping hydraulic oil circuit according to claim 3, characterized in that: The seventh oil circuit (170) is provided with a flow meter for detecting the flow of the hydraulic oil inside the seventh oil circuit (170).

6. The clamping hydraulic oil circuit according to claim 1, characterized in that: A plurality of first oil ports are provided at one end of the first cavity (6) of the clamping cylinder (5) away from the piston, and the plurality of first oil ports are all connected to the third rear oil circuit (132). A plurality of second oil circuits (120) are also provided at one end of the second cavity (7) away from the piston, and the plurality of second oil ports are all connected to the fourth oil circuit (140).

7. A clamping mechanism, characterized in that: It comprises the clamping hydraulic oil circuit as described in any one of claims 1 to 6.

8. A high-speed packaging machine, characterized in that: Comprising the clamping mechanism as described in claim 7.

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