Single-cylinder injection hydraulic oil way of injection molding machine

Abstract

The utility model provides a single-cylinder injection hydraulic oil circuit of an injection molding machine, which belongs to the technical field of injection molding machines and comprises a pressure oil supply end, an oil tank, a seat moving oil cylinder, an injection oil cylinder, a storage motor, a first electromagnetic directional valve, a second electromagnetic directional valve and a third electromagnetic directional valve. According to an injection single-cylinder structure and the characteristics that the oil inlet amount of the oil cylinder is large and the oil return amount of the oil cylinder is small during injection action, a first reversing working oil port and a fourth reversing working oil port are both communicated with a rodless cavity of the injection oil cylinder to form an injection double-channel to achieve oil inlet of the injection oil cylinder, and a second working reversing valve is communicated with a rod cavity of the injection oil cylinder to achieve oil return of the injection oil cylinder. The injection loop flow requirement is met, and the cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection molding machines and relates to a single-cylinder injection hydraulic oil circuit for an injection molding machine. Background Art

[0002] With the continuous development of injection molding machines, most small injection molding machines currently use single-cylinder injection systems. Figure 1 In the hydraulic system shown, the injection action and the storage action of this circuit are independently controlled by different reversing valves. This circuit has a wide range of applications, simple principles and stable operation.

[0003] Since single-cylinder injection of small injection molding machines requires a higher injection speed, the injection action generally requires more flow than the storage action. Therefore, the injection reversing valve will be one specification larger than the storage reversing valve based on the flow demand, so it is often more expensive and has a large room for improvement. Summary of the invention

[0004] The purpose of the utility model is to solve the above problems in the prior art and propose a single-cylinder injection hydraulic oil circuit for an injection molding machine, comprising:

[0005] Pressure oil supply end, oil tank, seat shifting cylinder, injection cylinder and storage motor;

[0006] It also includes a first solenoid reversing valve, a second solenoid reversing valve and a third solenoid reversing valve, wherein the first solenoid reversing valve includes a first reversing working oil port, a second reversing working oil port, a first reversing oil inlet port and a first reversing oil return port, the second solenoid reversing valve includes a third reversing working oil port, a fourth reversing working oil port, a second reversing oil inlet port and a second reversing oil return port, and the third solenoid reversing valve includes a fifth reversing working oil port, a sixth reversing working oil port, a third reversing oil inlet port and a third reversing oil return port;

[0007] The first reversing working oil port is connected to the rodless chamber of the injection cylinder, the second reversing working oil port is connected to the rod chamber of the injection cylinder, the first reversing oil inlet is connected to the pressure oil supply end, the first reversing oil return port is connected to the oil tank, the third reversing working oil port is connected to the oil inlet of the storage motor, the fourth reversing working oil port is connected to the rodless chamber of the injection cylinder, the second reversing oil inlet is connected to the pressure oil supply end, the second reversing oil return port is connected to the oil tank, the fifth reversing working oil port is connected to the rod chamber of the seat shifting cylinder, the sixth reversing working oil port is connected to the rodless chamber of the seat shifting cylinder, the third reversing oil inlet is connected to the pressure oil supply end, the third reversing oil return port is connected to the oil tank, and the oil return port of the storage motor is connected to the oil tank.

[0008] In the above-mentioned proportional control mold opening and closing hydraulic circuit of an injection molding machine, the hydraulic oil provided by the pressure oil supply end enters the rodless chamber of the injection cylinder through the first electromagnetic reversing valve and the second electromagnetic reversing valve, and the hydraulic oil in the rod chamber of the injection cylinder returns to the oil tank through the first electromagnetic reversing valve to complete the injection action;

[0009] The hydraulic oil provided by the pressure oil supply end enters the rod chamber of the injection cylinder through the first electromagnetic reversing valve, and the hydraulic oil in the rodless chamber of the injection cylinder returns to the oil tank through the first electromagnetic reversing valve to complete the injection action;

[0010] The hydraulic oil provided by the pressure oil supply end enters the oil inlet of the accumulator motor through the second electromagnetic reversing valve, and then flows out from the oil return port of the accumulator motor into the oil tank, thereby rotating the accumulator motor and driving the internal screw to rotate, completing the pre-plasticization action;

[0011] The hydraulic oil in the rodless chamber of the injection cylinder passes through the second electromagnetic reversing valve, and then passes through the first electromagnetic reversing valve, and flows into the rodless chamber of the injection cylinder to complete the oil replenishment action;

[0012] The hydraulic oil provided by the pressure oil supply end enters the rod chamber of the seat-shifting oil cylinder through the third electromagnetic reversing valve, and the hydraulic oil in the rodless chamber of the seat-shifting oil cylinder returns to the oil tank through the third electromagnetic reversing valve, completing the forward movement of the shooting platform;

[0013] The hydraulic oil provided by the pressure oil supply end enters the rodless chamber of the seat shifting cylinder through the third electromagnetic reversing valve, and the hydraulic oil in the rod chamber of the seat shifting cylinder returns to the oil tank through the third electromagnetic reversing valve, completing the backward movement of the shooting platform.

[0014] In the above-mentioned proportional control mold opening and closing hydraulic circuit of an injection molding machine, the first electromagnetic reversing valve is provided with a first reversing position, a first intermediate position and a second reversing position, and the first electromagnetic reversing valve includes a first electromagnet and a second electromagnet. When both the first electromagnet and the second electromagnet are not energized, the valve core of the first electromagnetic reversing valve moves to the first intermediate position, the first reversing working oil port and the first reversing oil inlet are both blocked, and the first reversing oil return port is connected with the second reversing working oil port; when the first electromagnet is energized, the valve core of the first electromagnetic reversing valve moves to the first reversing position, the first reversing oil inlet is connected with the first reversing working oil port, and the first reversing oil return port is connected with the second reversing working oil port; when the second electromagnet is energized, the valve core of the first electromagnetic reversing valve moves to the second reversing position, the first reversing oil inlet is connected with the second reversing working oil port, and the first reversing oil return port is connected with the first reversing working oil port.

[0015] In the above-mentioned proportional control mold opening and closing hydraulic circuit of an injection molding machine, the second electromagnetic reversing valve is provided with a third reversing position, a second intermediate position and a fourth reversing position, and the second electromagnetic reversing valve includes a third electromagnet and a fourth electromagnet. When the third electromagnet and the fourth electromagnet are both not energized, the valve core of the second electromagnetic reversing valve moves to the second intermediate position, and the third reversing working oil port, the fourth reversing working oil port, the second reversing oil inlet port and the second reversing oil return port are all blocked; when the third electromagnet is energized, the valve core of the second electromagnetic reversing valve moves to the third reversing position, the second reversing oil inlet port is connected with the third reversing working oil port, and the second reversing oil return port is connected with the fourth reversing working oil port; when the fourth electromagnet is energized, the valve core of the second electromagnetic reversing valve moves to the fourth reversing position, the second reversing oil inlet port is connected with the fourth reversing working oil port, and the second reversing oil return port is connected with the third reversing working oil port.

[0016] In the above-mentioned proportional control mold opening and closing hydraulic circuit of an injection molding machine, when the first electromagnet and the fourth electromagnet are energized, the valve core of the first electromagnetic reversing valve moves to the first reversing position, and the valve core of the second electromagnetic reversing valve moves to the fourth reversing position, so that the hydraulic oil provided by the pressure oil supply end flows into the rodless chamber of the injection cylinder through the first reversing oil inlet to the first reversing working oil port, and at the same time, the hydraulic oil provided by the pressure oil supply end flows into the rodless chamber of the injection cylinder through the second reversing oil inlet to the fourth reversing working oil port. At this time, the hydraulic oil in the rod chamber of the injection cylinder flows into the oil tank through the second reversing working oil port to the first reversing oil return port, thereby pushing the piston rod of the injection cylinder to extend and completing the injection action;

[0017] When the second electromagnet is energized, the valve core of the first electromagnetic reversing valve moves to the second reversing position, so that the hydraulic oil provided by the pressure oil supply end flows into the rod chamber of the injection cylinder through the first reversing oil inlet port to the second reversing working oil port. At this time, the hydraulic oil in the rod chamber of the injection cylinder flows into the oil tank through the second reversing working oil port to the first reversing oil return port, thereby pushing the piston rod of the injection cylinder to retract and completing the ejection action;

[0018] When the third electromagnet is energized, the valve core of the second electromagnetic reversing valve moves to the third reversing position, so that the hydraulic oil provided by the pressure oil supply end flows into the oil inlet of the accumulator motor through the second reversing oil inlet to the fourth reversing working oil port, and then flows into the oil tank from the oil return port of the accumulator motor, thereby driving the screw of the accumulator motor to rotate and completing the pre-plasticizing action;

[0019] The hydraulic oil in the rodless chamber of the injection cylinder passes through the fourth reversing working oil port to the second reversing oil return port and then passes through the first reversing oil return port and the second reversing working oil port, and flows into the rodless chamber of the injection cylinder to complete the oil replenishment action.

[0020] In the above-mentioned proportional control mold opening and closing hydraulic circuit of an injection molding machine, the third electromagnetic reversing valve is provided with a fifth reversing position, a third intermediate position and a sixth reversing position, and the third electromagnetic reversing valve includes a fifth electromagnet and a sixth electromagnet. When the fifth electromagnet and the sixth electromagnet are both not energized, the valve core of the third electromagnetic reversing valve moves to the third intermediate position, and the fifth reversing working oil port, the sixth reversing working oil port, the third reversing oil inlet and the third reversing oil return port are all blocked; when the fifth electromagnet is energized, the valve core of the third electromagnetic reversing valve moves to the fifth reversing position, the third reversing oil inlet is connected with the fifth reversing working oil port, and the third reversing oil return port is connected with the sixth reversing working oil port; when the sixth electromagnet is energized, the valve core of the third electromagnetic reversing valve moves to the sixth reversing position, the third reversing oil inlet is connected with the sixth reversing working oil port, and the third reversing oil return port is connected with the fifth reversing working oil port.

[0021] In the above-mentioned proportional control mold opening and closing hydraulic circuit of an injection molding machine, when the fifth electromagnet is energized, the valve core of the third electromagnetic reversing valve moves to the fifth reversing position, so that the hydraulic oil provided by the pressure oil supply end flows into the rod chamber of the seat shifting cylinder through the third reversing oil inlet to the fifth reversing working oil port. At this time, the hydraulic oil in the rodless chamber of the seat shifting cylinder flows into the oil tank through the sixth reversing working oil port to the third reversing oil return port, pushing the piston rod of the seat shifting cylinder to retract, completing the forward movement of the shooting platform;

[0022] When the sixth electromagnet is energized, the valve core of the third electromagnetic reversing valve moves to the sixth reversing position, so that the hydraulic oil provided by the pressure oil supply end flows into the rodless chamber of the seat shifting cylinder through the third reversing oil inlet port to the sixth reversing working oil port. At this time, the hydraulic oil in the rod chamber of the seat shifting cylinder flows into the oil tank through the fifth reversing working oil port to the third reversing oil return port, pushing the piston rod of the seat shifting cylinder to extend, completing the backward movement of the shooting platform.

[0023] In the above-mentioned proportional control mold opening and closing hydraulic circuit of an injection molding machine, it also includes a back pressure valve, the back pressure valve includes a first back pressure working oil port and a second back pressure working oil port, the first back pressure working oil port is connected to the second reversing return oil port, the second back pressure working oil port is connected to the oil tank, a proportional pressure valve is arranged between the back pressure valve and the oil tank, and the proportional pressure valve is used to control the opening pressure of the back pressure valve when powered.

[0024] In the above-mentioned proportional control mold opening and closing hydraulic circuit of an injection molding machine, a back pressure pressure gauge is arranged between the back pressure valve and the second electromagnetic reversing valve, and the back pressure pressure gauge is connected to the rodless chamber of the injection cylinder; a system pressure gauge is arranged between the third electromagnetic reversing valve and the pressure oil supply end, and the system pressure gauge is connected to the pressure oil supply end.

[0025] In the above-mentioned proportional control mold opening and closing hydraulic circuit of an injection molding machine, a one-way valve is arranged between the pressure oil supply end and the third solenoid reversing valve, and the one-way valve includes a one-way oil inlet and a one-way oil return port. The one-way oil inlet is connected to the pressure oil supply end, and the one-way oil return port is connected to the third reversing oil inlet.

[0026] Compared with the prior art, the beneficial effects of the utility model are:

[0027] 1. According to the structure of the injection single cylinder, the oil inlet of the cylinder is large and the oil return of the cylinder is small during the injection action. The first reversing working oil port and the fourth reversing working oil port are both connected with the rodless cavity of the injection cylinder to form a double injection channel to realize the oil inlet of the injection cylinder. The second working reversing valve is connected with the rod cavity of the injection cylinder to realize the oil return of the injection cylinder, meet the flow demand of the injection circuit, and reduce costs.

[0028] 2. By setting the solenoid on one side of the proportional pressure valve, the oil return back pressure of the rodless chamber of the control cylinder when the screw is retreated is controlled, thereby realizing the control of the pre-plastic back pressure.

[0029] 3. A one-way valve is added between the pressure oil supply end and the third solenoid reversing valve to provide one-way hydraulic oil supply to the third solenoid reversing valve and prevent the hydraulic oil from flowing back under the reverse pressure of the system, thereby ensuring the normal working order of the hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the single-cylinder injection oil circuit of an existing small injection molding machine.

[0031] Figure 2 It is a schematic diagram of a single-cylinder injection hydraulic oil circuit of an injection molding machine of the utility model.

[0032] In the figure:

[0033] 1. Pressure oil supply end; 2. Oil tank; 3. Seat shifting cylinder; 4. Injection cylinder; 5. Storage motor; 6. First solenoid reversing valve; 7. Second solenoid reversing valve; 8. Third solenoid reversing valve; 9. Back pressure valve; 10. Proportional pressure valve; 11. Check valve; A1. First reversing oil port; B1. Second reversing oil port; P1. First reversing oil inlet; T1. First reversing oil return port; D1. First solenoid; D2. Second solenoid; A2. Third reversing oil port; B2. Fourth reversing directional working oil port; P2, second reversing oil inlet port; T2, second reversing oil return port; D3, third electromagnet; D4, fourth electromagnet; A3, fifth reversing working oil port; B3, sixth reversing working oil port; P3, third reversing oil inlet port; T3, third reversing oil return port; D5, fifth electromagnet; D6, sixth electromagnet; A4, first back pressure working oil port; B4, second reversing back pressure oil port; P4, one way oil inlet port; T4, one way oil return port; C1, system pressure gauge; C2, back pressure gauge. DETAILED DESCRIPTION

[0034] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0035] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, in the present invention, the descriptions of "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0039] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0040] like Figure 1-Figure 2 As shown, a single-cylinder injection hydraulic oil circuit of an injection molding machine includes: a pressure oil supply end 1, an oil tank 2, a seat moving cylinder 3, an injection cylinder 4 and a storage motor 5;

[0041] Among them, it also includes a first solenoid reversing valve 6, a second solenoid reversing valve 7 and a third solenoid reversing valve 8. The first solenoid reversing valve 6 includes a first reversing working oil port A1, a second reversing working oil port B1, a first reversing oil inlet port P1 and a first reversing oil return port T1. The second solenoid reversing valve 7 includes a third reversing working oil port A2, a fourth reversing working oil port B2, a second reversing oil inlet port P2 and a second reversing oil return port T2. The third solenoid reversing valve 8 includes a fifth reversing working oil port A3, a sixth reversing working oil port B3, a third reversing oil inlet port P3 and a third reversing oil return port T3.

[0042] Among them, the first reversing working oil port A1 is connected to the rodless chamber of the injection cylinder 4, the second reversing working oil port B1 is connected to the rod chamber of the injection cylinder 4, the first reversing oil inlet P1 is connected to the pressure oil supply end 1, the first reversing oil return port T1 is connected to the oil tank 2, the third reversing working oil port A2 is connected to the oil inlet of the storage motor 5, the fourth reversing working oil port B2 is connected to the rodless chamber of the injection cylinder 4, the second reversing oil inlet P2 is connected to the pressure oil supply end 1, the second reversing oil return port T2 is connected to the oil tank 2, the fifth reversing working oil port A3 is connected to the rod chamber of the seat shifting cylinder 3, the sixth reversing working oil port B3 is connected to the rodless chamber of the seat shifting cylinder 3, the third reversing oil inlet P3 is connected to the pressure oil supply end 1, the third reversing oil return port T3 is connected to the oil tank 2, and the oil return port of the storage motor 5 is connected to the oil tank 2.

[0043] In this embodiment, according to the injection single-cylinder structure, the oil intake of the cylinder is large and the oil return of the cylinder is small during the injection action. The first reversing working oil port A1 and the fourth reversing working oil port B2 are both connected to the rodless cavity of the injection cylinder 4 to form an injection dual channel to realize the oil intake of the injection cylinder 4. The second working reversing valve is connected to the rod cavity of the injection cylinder 4 to realize the oil return of the injection cylinder 4, thereby meeting the flow requirements of the injection circuit and reducing costs.

[0044] like Figure 1-Figure 2 As shown, on the basis of the above-mentioned embodiment, the hydraulic oil provided by the pressure oil supply end 1 enters the rodless chamber of the injection cylinder 4 through the first solenoid reversing valve 6 and the second solenoid reversing valve 7, and the hydraulic oil in the rod chamber of the injection cylinder 4 returns to the oil tank 2 through the first solenoid reversing valve 6 to complete the injection action.

[0045] The hydraulic oil provided by the pressure oil supply end 1 enters the rod chamber of the injection cylinder 4 through the first electromagnetic reversing valve 6, and the hydraulic oil in the rodless chamber of the injection cylinder 4 returns to the oil tank 2 through the first electromagnetic reversing valve 6 to complete the injection action.

[0046] The hydraulic oil provided by the pressure oil supply end 1 enters the oil inlet of the accumulator motor 5 through the second electromagnetic reversing valve 7, and then flows out from the oil return port of the accumulator motor 5 into the oil tank 2, thereby rotating the accumulator motor 5 and driving the internal screw to rotate, completing the pre-plasticizing action.

[0047] The hydraulic oil in the rodless chamber of the injection cylinder 4 passes through the second electromagnetic reversing valve 7 and then the first electromagnetic reversing valve 6, and flows into the rodless chamber of the injection cylinder 4 to complete the oil replenishment action.

[0048] The hydraulic oil provided by the pressure oil supply end 1 enters the rod chamber of the seat shifting cylinder 3 through the third electromagnetic reversing valve 8, and the hydraulic oil in the rodless chamber of the seat shifting cylinder 3 returns to the oil tank 2 through the third electromagnetic reversing valve 8, completing the forward movement of the shooting platform.

[0049] The hydraulic oil provided by the pressure oil supply end 1 enters the rodless chamber of the seat shifting cylinder 3 through the third electromagnetic reversing valve 8, and the hydraulic oil in the rod chamber of the seat shifting cylinder 3 returns to the oil tank 2 through the third electromagnetic reversing valve 8, completing the backward movement of the shooting platform.

[0050] In this embodiment, by reasonably configuring and controlling the first, second, and third electromagnetic reversing valves 8 and accurately adjusting the hydraulic oil circuit, the injection cylinder 4 is driven to complete injection and ejection, the storage motor 5 is driven to perform pre-plasticization, and the seat cylinder 3 is driven to move the shooting platform forward and backward.

[0051] like Figure 1-Figure 2As shown, on the basis of the above embodiment, the first electromagnetic reversing valve 6 is provided with a first reversing position, a first intermediate position and a second reversing position, and the first electromagnetic reversing valve 6 includes a first electromagnet D1 and a second electromagnet D2. When the first electromagnet D1 and the second electromagnet D2 are both not energized, the valve core of the first electromagnetic reversing valve 6 moves to the first intermediate position, the first reversing working oil port A1 and the first reversing oil inlet P1 are both blocked, and the first reversing oil return port T1 is connected to the second reversing working oil port B1; when the first electromagnet D1 is energized, the valve core of the first electromagnetic reversing valve 6 moves to the first reversing position, the first reversing oil inlet P1 is connected to the first reversing working oil port A1, and the first reversing oil return port T1 is connected to the second reversing working oil port B1; when the second electromagnet D2 is energized, the valve core of the first electromagnetic reversing valve 6 moves to the second reversing position, the first reversing oil inlet P1 is connected to the second reversing working oil port B1, and the first reversing oil return port T1 is connected to the first reversing working oil port A1.

[0052] In this embodiment, the valve core of the first electromagnetic reversing valve 6 is switched to a specific reversing position under the energization and driving of different electromagnets, so as to realize the connection and blocking of each oil circuit.

[0053] like Figure 1-Figure 2 As shown, on the basis of the above embodiment, the second electromagnetic reversing valve 7 is provided with a third reversing position, a second intermediate position and a fourth reversing position, and the second electromagnetic reversing valve 7 includes a third electromagnet D3 and a fourth electromagnet D4. When the third electromagnet D3 and the fourth electromagnet D4 are both not energized, the valve core of the second electromagnetic reversing valve 7 moves to the second intermediate position, and the third reversing working oil port A2, the fourth reversing working oil port B2, the second reversing oil inlet port P2 and the second reversing oil return port T2 are all blocked. ; When the third electromagnet D3 is energized, the valve core of the second electromagnetic reversing valve 7 moves to the third reversing position, the second reversing oil inlet P2 is connected to the third reversing working oil port A2, and the second reversing oil return port T2 is connected to the fourth reversing working oil port B2; when the fourth electromagnet D4 is energized, the valve core of the second electromagnetic reversing valve 7 moves to the fourth reversing position, the second reversing oil inlet P2 is connected to the fourth reversing working oil port B2, and the second reversing oil return port T2 is connected to the third reversing working oil port A2.

[0054] In this embodiment, the valve core of the second electromagnetic reversing valve 7 is switched to a specific reversing position under the energization and driving of different electromagnets, so as to realize the connection and blocking of each oil circuit.

[0055] like Figure 1-Figure 2As shown, on the basis of the above-mentioned embodiment, when the first electromagnet D1 and the fourth electromagnet D4 are energized, the valve core of the first electromagnetic reversing valve 6 moves to the first reversing position, and the valve core of the second electromagnetic reversing valve 7 moves to the fourth reversing position, so that the hydraulic oil provided by the pressure oil supply end 1 flows into the rodless chamber of the injection cylinder 4 through the first reversing oil inlet P1 to the first reversing working oil port A1, and at the same time, the hydraulic oil provided by the pressure oil supply end 1 flows into the rodless chamber of the injection cylinder 4 through the second reversing oil inlet P2 to the fourth reversing working oil port B2. At this time, the hydraulic oil in the rod chamber of the injection cylinder 4 flows into the oil tank 2 through the second reversing working oil port B1 to the first reversing return oil port T1, thereby pushing the piston rod of the injection cylinder 4 to extend to complete the injection action.

[0056] When the second electromagnet D2 is energized, the valve core of the first electromagnetic reversing valve 6 moves to the second reversing position, so that the hydraulic oil provided by the pressure oil supply end 1 flows into the rod chamber of the injection cylinder 4 through the first reversing oil inlet port P1 to the second reversing working oil port B1. At this time, the hydraulic oil in the rod chamber of the injection cylinder 4 flows into the oil tank 2 through the second reversing working oil port B1 to the first reversing oil return port T1, thereby pushing the piston rod of the injection cylinder 4 to retract and complete the ejection action.

[0057] When the third electromagnet D3 is energized, the valve core of the second electromagnetic reversing valve 7 moves to the third reversing position, so that the hydraulic oil provided by the pressure oil supply end 1 flows into the oil inlet of the accumulator motor 5 through the second reversing oil inlet P2 to the fourth reversing working oil port B2, and then flows into the oil tank 2 from the oil return port of the accumulator motor 5, thereby driving the screw of the accumulator motor 5 to rotate and completing the pre-plasticizing action.

[0058] The hydraulic oil in the rodless chamber of the injection cylinder 4 passes through the fourth reversing working oil port B2 to the second reversing oil return port T2 and then passes through the first reversing oil return port T1 and the second reversing working oil port B1, and flows into the rodless chamber of the injection cylinder 4 to complete the oil replenishment action.

[0059] In this embodiment, by controlling the energized state of the first electromagnet D1 and the second electromagnet D2, the rod chamber and the rodless chamber of the injection cylinder 4 are connected to the pressure oil supply end and the oil tank 2, thereby completing the injection and ejection actions; by controlling the energized state of the third electromagnet D3, the oil inlet of the storage motor 5 is connected to the pressure oil supply end 1, thereby allowing the storage motor 5 to complete the pre-plasticization action.

[0060] like Figure 1-Figure 2As shown, on the basis of the above embodiment, the third electromagnetic reversing valve 8 is provided with a fifth reversing position, a third intermediate position and a sixth reversing position, and the third electromagnetic reversing valve 8 includes a fifth electromagnet D5 and a sixth electromagnet D6. When the fifth electromagnet D5 and the sixth electromagnet D6 are both powered off, the valve core of the third electromagnetic reversing valve 8 moves to the third intermediate position, and the fifth reversing working oil port A3, the sixth reversing working oil port B3, the third reversing oil inlet port P3 and the third reversing oil return port T3 are all blocked. ; When the fifth electromagnet D5 is energized, the valve core of the third electromagnetic reversing valve 8 moves to the fifth reversing position, the third reversing oil inlet P3 is connected with the fifth reversing working oil port A3, and the third reversing oil return port T3 is connected with the sixth reversing working oil port B3; when the sixth electromagnet D6 is energized, the valve core of the third electromagnetic reversing valve 8 moves to the sixth reversing position, the third reversing oil inlet P3 is connected with the sixth reversing working oil port B3, and the third reversing oil return port T3 is connected with the fifth reversing working oil port A3.

[0061] In this embodiment, the valve core of the third electromagnetic reversing valve 8 is switched to a specific reversing position under the energization and driving of different electromagnets to achieve the connection and blocking of each oil circuit.

[0062] like Figure 1-Figure 2 As shown, on the basis of the above-mentioned embodiment, when the fifth electromagnet D5 is energized, the valve core of the third electromagnetic reversing valve 8 moves to the fifth reversing position, so that the hydraulic oil provided by the pressure oil supply end 1 passes through the third reversing oil inlet port P3 to the fifth reversing working oil port A3 and flows into the rod chamber of the seat shifting cylinder 3. At this time, the hydraulic oil in the rodless chamber of the seat shifting cylinder 3 passes through the sixth reversing working oil port B3 to the third reversing oil return port T3 and flows into the oil tank 2, pushing the piston rod of the seat shifting cylinder 3 to retract, thereby completing the forward movement of the shooting platform.

[0063] When the sixth electromagnet D6 is energized, the valve core of the third electromagnetic reversing valve 8 moves to the sixth reversing position, so that the hydraulic oil provided by the pressure oil supply end 1 flows into the rodless chamber of the seat shifting cylinder 3 through the third reversing oil inlet port P3 to the sixth reversing working oil port B3. At this time, the hydraulic oil in the rod chamber of the seat shifting cylinder 3 flows into the oil tank 2 through the fifth reversing working oil port A3 to the third reversing oil return port T3, pushing the piston rod of the seat shifting cylinder 3 to extend, completing the backward movement of the shooting platform.

[0064] In this embodiment, the hydraulic oil provided by the pressure oil supply end 1 can flow to the rodless chamber or the rod chamber of the seat shifting cylinder 3 by adjusting the position of the valve core of the third electromagnetic reversing valve 8. At this time, the hydraulic oil in the other side chamber can also flow back to the oil tank 2 through the third electromagnetic reversing valve 8, thereby completing the forward and backward movements of the shooting platform of the seat shifting cylinder 3.

[0065] like Figure 1-Figure 2 As shown, on the basis of the above embodiment, it also includes a back pressure valve 9, the back pressure valve 9 includes a first back pressure working oil port A4 and a second back pressure working oil port, the first back pressure working oil port A4 is connected to the second reversing return oil port T2, the second back pressure working oil port is connected to the oil tank 2, and a proportional pressure valve 10 is arranged between the back pressure valve 9 and the oil tank 2, and the proportional pressure valve 10 is used to control the opening pressure of the back pressure valve 9 when powered.

[0066] In this embodiment, the solenoid on one side of the proportional pressure valve 10 can be set to control the oil return back pressure of the rodless chamber of the cylinder when the screw is retreated, thereby achieving pre-plastic back pressure control.

[0067] like Figure 1-Figure 2 As shown, on the basis of the above embodiment, a back pressure gauge C2 is arranged between the back pressure valve 9 and the second electromagnetic reversing valve 7, and the back pressure gauge C2 is connected to the rodless chamber of the injection cylinder 4; a system pressure gauge C1 is arranged between the third electromagnetic reversing valve 8 and the pressure oil supply end 1, and the system pressure gauge C1 is connected to the pressure oil supply end 1.

[0068] In this embodiment, the system pressure gauge C1 is used to monitor the pressure of the oil circuit through which the hydraulic oil provided by the pressure oil supply end 1 passes, and the back pressure valve is used to monitor the pressure of the return oil back pressure.

[0069] like Figure 1-Figure 2 As shown, on the basis of the above embodiment, a one-way valve 11 is arranged between the pressure oil supply end 1 and the third electromagnetic reversing valve 8, and the one-way valve 11 includes a one-way oil inlet P4 and a one-way oil return port T4, the one-way oil inlet P4 is connected to the pressure oil supply end 1, and the one-way oil return port T4 is connected to the third reversing oil inlet P3.

[0070] In this embodiment, a one-way valve 11 is added between the pressure oil supply end 1 and the third solenoid reversing valve 8 to provide one-way hydraulic oil supply to the third solenoid reversing valve 8 and prevent the hydraulic oil from flowing back under the reverse pressure of the system, thereby ensuring the normal working order of the hydraulic system.

Claims

1. A single-cylinder injection hydraulic oil circuit for an injection molding machine, comprising: The pressure oil supply end, the oil tank, the seat moving oil cylinder, the injection oil cylinder and the storage motor are characterized in that they also include: A first solenoid reversing valve, a second solenoid reversing valve and a third solenoid reversing valve, wherein the first solenoid reversing valve comprises a first reversing working oil port, a second reversing working oil port, a first reversing oil inlet port and a first reversing oil return port, the second solenoid reversing valve comprises a third reversing working oil port, a fourth reversing working oil port, a second reversing oil inlet port and a second reversing oil return port, and the third solenoid reversing valve comprises a fifth reversing working oil port, a sixth reversing working oil port, a third reversing oil inlet port and a third reversing oil return port; The first reversing working oil port is connected to the rodless chamber of the injection cylinder, the second reversing working oil port is connected to the rod chamber of the injection cylinder, the first reversing oil inlet is connected to the pressure oil supply end, the first reversing oil return port is connected to the oil tank, the third reversing working oil port is connected to the oil inlet of the storage motor, the fourth reversing working oil port is connected to the rodless chamber of the injection cylinder, the second reversing oil inlet is connected to the pressure oil supply end, the second reversing oil return port is connected to the oil tank, the fifth reversing working oil port is connected to the rod chamber of the seat shifting cylinder, the sixth reversing working oil port is connected to the rodless chamber of the seat shifting cylinder, the third reversing oil inlet is connected to the pressure oil supply end, the third reversing oil return port is connected to the oil tank, and the oil return port of the storage motor is connected to the oil tank.

2. The single-cylinder injection hydraulic oil circuit of an injection molding machine according to claim 1, characterized in that: The hydraulic oil provided by the pressure oil supply end enters the rodless chamber of the injection cylinder through the first electromagnetic reversing valve and the second electromagnetic reversing valve, and the hydraulic oil in the rod chamber of the injection cylinder returns to the oil tank through the first electromagnetic reversing valve to complete the injection action; The hydraulic oil provided by the pressure oil supply end enters the rod chamber of the injection cylinder through the first electromagnetic reversing valve, and the hydraulic oil in the rodless chamber of the injection cylinder returns to the oil tank through the first electromagnetic reversing valve to complete the injection action; The hydraulic oil provided by the pressure oil supply end enters the oil inlet of the accumulator motor through the second electromagnetic reversing valve, and then flows out from the oil return port of the accumulator motor into the oil tank, thereby rotating the accumulator motor and driving the internal screw to rotate, completing the pre-plasticization action; The hydraulic oil in the rodless chamber of the injection cylinder passes through the second electromagnetic reversing valve, and then passes through the first electromagnetic reversing valve, and flows into the rodless chamber of the injection cylinder to complete the oil replenishment action; The hydraulic oil provided by the pressure oil supply end enters the rod chamber of the seat-shifting oil cylinder through the third electromagnetic reversing valve, and the hydraulic oil in the rodless chamber of the seat-shifting oil cylinder returns to the oil tank through the third electromagnetic reversing valve, completing the forward movement of the shooting platform; The hydraulic oil provided by the pressure oil supply end enters the rodless chamber of the seat shifting cylinder through the third electromagnetic reversing valve, and the hydraulic oil in the rod chamber of the seat shifting cylinder returns to the oil tank through the third electromagnetic reversing valve, completing the backward movement of the shooting platform.

3. The single-cylinder injection hydraulic oil circuit of an injection molding machine according to claim 2, characterized in that: The first electromagnetic reversing valve is provided with a first reversing position, a first intermediate position and a second reversing position. The first electromagnetic reversing valve comprises a first electromagnet and a second electromagnet. When both the first electromagnet and the second electromagnet are not energized, the valve core of the first electromagnetic reversing valve moves to the first intermediate position, the first reversing working oil port and the first reversing oil inlet are both blocked, and the first reversing oil return port is connected with the second reversing working oil port; when the first electromagnet is energized, the valve core of the first electromagnetic reversing valve moves to the first reversing position, the first reversing oil inlet is connected with the first reversing working oil port, and the first reversing oil return port is connected with the second reversing working oil port; when the second electromagnet is energized, the valve core of the first electromagnetic reversing valve moves to the second reversing position, the first reversing oil inlet is connected with the second reversing working oil port, and the first reversing oil return port is connected with the first reversing working oil port.

4. The single-cylinder injection hydraulic oil circuit of an injection molding machine according to claim 3, characterized in that: The second electromagnetic reversing valve is provided with a third reversing position, a second intermediate position and a fourth reversing position. The second electromagnetic reversing valve includes a third electromagnet and a fourth electromagnet. When the third electromagnet and the fourth electromagnet are both not energized, the valve core of the second electromagnetic reversing valve moves to the second intermediate position, and the third reversing working oil port, the fourth reversing working oil port, the second reversing oil inlet port and the second reversing oil return port are all blocked; when the third electromagnet is energized, the valve core of the second electromagnetic reversing valve moves to the third reversing position, the second reversing oil inlet port is connected with the third reversing working oil port, and the second reversing oil return port is connected with the fourth reversing working oil port; when the fourth electromagnet is energized, the valve core of the second electromagnetic reversing valve moves to the fourth reversing position, the second reversing oil inlet port is connected with the fourth reversing working oil port, and the second reversing oil return port is connected with the third reversing working oil port.

5. The single-cylinder injection hydraulic oil circuit of an injection molding machine according to claim 4, characterized in that: When the first electromagnet and the fourth electromagnet are energized, the valve core of the first electromagnetic reversing valve moves to the first reversing position, and the valve core of the second electromagnetic reversing valve moves to the fourth reversing position, so that the hydraulic oil provided by the pressure oil supply end flows into the rodless chamber of the injection cylinder through the first reversing oil inlet to the first reversing working oil port, and at the same time, the hydraulic oil provided by the pressure oil supply end flows into the rodless chamber of the injection cylinder through the second reversing oil inlet to the fourth reversing working oil port. At this time, the hydraulic oil in the rod chamber of the injection cylinder flows into the oil tank through the second reversing working oil port to the first reversing oil return port, thereby pushing the piston rod of the injection cylinder to extend and completing the injection action; When the second electromagnet is energized, the valve core of the first electromagnetic reversing valve moves to the second reversing position, so that the hydraulic oil provided by the pressure oil supply end flows into the rod chamber of the injection cylinder through the first reversing oil inlet port to the second reversing working oil port. At this time, the hydraulic oil in the rod chamber of the injection cylinder flows into the oil tank through the second reversing working oil port to the first reversing oil return port, thereby pushing the piston rod of the injection cylinder to retract and completing the ejection action; When the third electromagnet is energized, the valve core of the second electromagnetic reversing valve moves to the third reversing position, so that the hydraulic oil provided by the pressure oil supply end flows into the oil inlet of the accumulator motor through the second reversing oil inlet to the fourth reversing working oil port, and then flows into the oil tank from the oil return port of the accumulator motor, thereby driving the screw of the accumulator motor to rotate and completing the pre-plasticizing action; The hydraulic oil in the rodless chamber of the injection cylinder passes through the fourth reversing working oil port to the second reversing oil return port and then passes through the first reversing oil return port and the second reversing working oil port, and flows into the rodless chamber of the injection cylinder to complete the oil replenishment action.

6. The single-cylinder injection hydraulic oil circuit of an injection molding machine according to claim 2, characterized in that: The third electromagnetic reversing valve is provided with a fifth reversing position, a third intermediate position and a sixth reversing position. The third electromagnetic reversing valve includes a fifth electromagnet and a sixth electromagnet. When the fifth electromagnet and the sixth electromagnet are both not energized, the valve core of the third electromagnetic reversing valve moves to the third intermediate position, and the fifth reversing working oil port, the sixth reversing working oil port, the third reversing oil inlet port and the third reversing oil return port are all blocked; when the fifth electromagnet is energized, the valve core of the third electromagnetic reversing valve moves to the fifth reversing position, the third reversing oil inlet port is connected with the fifth reversing working oil port, and the third reversing oil return port is connected with the sixth reversing working oil port; when the sixth electromagnet is energized, the valve core of the third electromagnetic reversing valve moves to the sixth reversing position, the third reversing oil inlet port is connected with the sixth reversing working oil port, and the third reversing oil return port is connected with the fifth reversing working oil port.

7. The single-cylinder injection hydraulic oil circuit of an injection molding machine according to claim 6, characterized in that: When the fifth electromagnet is energized, the valve core of the third electromagnetic reversing valve moves to the fifth reversing position, so that the hydraulic oil provided by the pressure oil supply end flows into the rod chamber of the seat shifting cylinder through the third reversing oil inlet port to the fifth reversing working oil port. At this time, the hydraulic oil in the rodless chamber of the seat shifting cylinder flows into the oil tank through the sixth reversing working oil port to the third reversing oil return port, pushing the piston rod of the seat shifting cylinder to retract, completing the forward movement of the shooting platform; When the sixth electromagnet is energized, the valve core of the third electromagnetic reversing valve moves to the sixth reversing position, so that the hydraulic oil provided by the pressure oil supply end flows into the rodless chamber of the seat shifting cylinder through the third reversing oil inlet port to the sixth reversing working oil port. At this time, the hydraulic oil in the rod chamber of the seat shifting cylinder flows into the oil tank through the fifth reversing working oil port to the third reversing oil return port, pushing the piston rod of the seat shifting cylinder to extend, completing the backward movement of the shooting platform.

8. The single-cylinder injection hydraulic oil circuit of an injection molding machine according to claim 6, characterized in that: It also includes a back-pressure valve, which includes a first back-pressure working oil port and a second back-pressure working oil port. The first back-pressure working oil port is connected to the second reversing return oil port, and the second back-pressure working oil port is connected to the oil tank. A proportional pressure valve is arranged between the back-pressure valve and the oil tank. The proportional pressure valve is used to control the opening pressure of the back-pressure valve when powered.

9. The single-cylinder injection hydraulic oil circuit of an injection molding machine according to claim 8, characterized in that: A back pressure gauge is arranged between the back pressure valve and the second electromagnetic reversing valve, and the back pressure gauge is connected to the rodless chamber of the injection cylinder; a system pressure gauge is arranged between the third electromagnetic reversing valve and the pressure oil supply end, and the system pressure gauge is connected to the pressure oil supply end.

10. The single-cylinder injection hydraulic oil circuit of an injection molding machine according to claim 1, characterized in that: A one-way valve is arranged between the pressure oil supply end and the third electromagnetic reversing valve, and the one-way valve includes a one-way oil inlet and a one-way oil return port. The one-way oil inlet is connected to the pressure oil supply end, and the one-way oil return port is connected to the third reversing oil inlet.

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