Integrated structure of short full oil valve at top of mold cylinder and double-sided quick cylinder

Abstract

The present application relates to the field of oil cylinder, disclose a kind of short full oil valve and double-sided quick cylinder integrated structure of mould cylinder top, including mould oil cylinder and two groups of parting oil cylinder, both lifting rods are connected movable die;Mould oil cylinder is connected with parting oil cylinder between hydraulic control check valve. The first rod cavity of parting oil cylinder is communicated with the first rodless cavity, and is connected oil tank by switching assembly. The second rod cavity of mould oil cylinder is connected with the second rodless cavity by first oil pump and hydraulic control check valve, and the first rod cavity is communicated with the control oil port of hydraulic control check valve. When moulding, first oil pump will be the hydraulic oil in the second rod cavity positive delivery to the second rodless cavity, while switching assembly controls parting oil cylinder auxiliary descent and utilizes the hydraulic control check valve of first rod cavity oil pressure locking. When opening, switching assembly makes first rod cavity oil inlet, pilot unlocks hydraulic control check valve, and the second rodless cavity oil liquid reversely flows back to the second rod cavity, and movable die is realized to rise.The present application solves the problem that single cylinder locking force is insufficient and double cylinder coordination is difficult.

Description

Technical Field

[0001] This invention relates to the field of hydraulic cylinders, and more particularly to an integrated structure of a short full-fill valve at the top of a mold cylinder and a double-sided fast cylinder. Background Technology

[0002] In injection molding machines and other pressure molding equipment, the mold closing and opening mechanism is the core component for achieving mold closure and pressure holding, as well as mold opening and part removal. Its driving method directly affects the equipment's operating efficiency, molding accuracy, and overall safety. In existing technologies, the mold closing and opening actions of the moving mold mostly rely on hydraulic systems. Common drive architectures mainly include two types: one uses a single main hydraulic cylinder to directly drive the moving mold platen to complete the mold closing and opening cycle. This solution has a relatively simple structure and low manufacturing cost, mainly controlling the extension and retraction of the piston rod through oil circuit reversal. The other uses two independent sets of hydraulic cylinders to handle mold closing and opening functions respectively. These cylinders operate alternately through separate oil supply circuits to distribute the load on a single cylinder and adapt to the process requirements of equipment with different tonnages. These solutions are widely used in conventional injection molding operations and constitute the mainstream technical basis for current pressure equipment mold closing drives.

[0003] However, the aforementioned existing technologies still have significant technical shortcomings in long-term, high-frequency, and high-load actual operation. First, under high-pressure mold-locking conditions, the cylinder body and sealing components of the single hydraulic cylinder drive scheme are subjected to extreme stress for a long time, which can easily lead to a decrease in mold-locking force due to local fatigue or seal failure. This poses safety hazards such as mold micro-expansion, flash on the product, or even structural damage to the equipment, and the overall reliability and safety of operation cannot meet the requirements of precision molding. Second, although the scheme of using two sets of independent hydraulic cylinders to perform mold closing and mold opening can alleviate the pressure of a single cylinder, the independent control of the two sets of hydraulic circuit systems makes it difficult to achieve high-precision timing coordination and flow matching. Pressure shocks and internal losses are easily generated at the moment of action switching, resulting in unstable movement trajectory of the moving mold plate. Mechanical interference or hydraulic competition can easily occur between the two sets of cylinders, which not only reduces the mold opening and closing response speed, but also significantly increases the complexity of the control system and the later maintenance costs. Therefore, how to overcome the safety bottleneck of traditional single-cylinder drive and the coordination problem of dual-cylinder separation, and design a mold closing drive structure that takes into account high mold-locking safety, fast response capability, and precise synchronous control has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, this invention provides an integrated structure of a short full-fill valve at the top of the mold cylinder and a double-sided rapid cylinder.

[0005] An integrated structure of a short full-oil valve at the top of a mold cylinder and dual-sided rapid cylinders includes a mold-closing cylinder and two sets of mold-separating cylinders. The lifting rods of the mold-closing cylinder and the two sets of mold-separating cylinders are connected to a moving mold. A hydraulically controlled check valve is connected between the mold-closing cylinder and the mold-separating cylinder. The first rod-side chamber and the first rodless chamber of the mold-separating cylinder are interconnected and connected to an oil tank through a switching assembly. The switching assembly is used to control the flow direction of hydraulic oil between the oil tank and the first rod-side chamber and the first rodless chamber. The mold-closing cylinder includes a second rod-side chamber and a second rodless chamber. A first oil pump is provided between the mold-closing cylinder and the hydraulically controlled check valve to forward-transport hydraulic oil in the second rod-side chamber to the second rodless chamber to control the descent of the moving mold. The first rod-side chamber is connected to the control port of the hydraulically controlled check valve. The switching assembly supplies oil and causes the mold-separating cylinder to rise, unlocking the hydraulically controlled check valve and pressurizing the hydraulic oil in the second rod-side chamber to reverse-transport it to the second rodless chamber to control the ascent of the moving mold.

[0006] As a further embodiment of the present invention, the hydraulically controlled one-way valve includes a valve body, a valve stem, a valve core, and a first spring. The valve body includes an inlet / outlet oil passage and a control oil passage that are interconnected. The two ends of the inlet / outlet oil passage are respectively connected to the outside of the valve body and form an inlet and an outlet. The first spring and the valve core are disposed in the inlet / outlet oil passage, and the first spring is located between the inner wall of the inlet / outlet oil passage and the rear end of the valve core. The first spring pushes the valve core to control the forward flow of the inlet / outlet oil passage from the inlet to the outlet. The valve stem is slidably disposed in the control oil passage and abuts against the front end of the valve core. The control oil passage is connected to the outside of the valve body and forms a control oil port. The control oil port is pressurized and drives the valve stem to push the valve core to reverse the flow from the outlet to the inlet. The second rod-side chamber is connected to the inlet, and the second rodless chamber is connected to the outlet.

[0007] As a further embodiment of the present invention, the hydraulic control check valve further includes a second spring, which is disposed in the control oil passage and abuts against the valve stem, and the second spring is used to push the valve stem to reset.

[0008] As a further aspect of the present invention, a temporary oil tank is provided between the first oil pump and the oil outlet, and the temporary oil tank is used to pressurize and regulate the oil volume difference between the second rod chamber and the second rodless chamber.

[0009] As a further embodiment of the present invention, the switching assembly includes a first oil pipe, a second oil pipe, a third oil pipe, and a switching mechanism. One end of the first oil pipe and the second oil pipe are connected to the oil reservoir, and the other end is connected to the first rod chamber and the first rodless chamber, respectively. Both ends of the third oil pipe are connected to the first rod chamber and the first rodless chamber, respectively. The first rod chamber and the first rodless chamber are both connected to the switching mechanism. The switching mechanism controls the hydraulic oil in the oil reservoir and the first rod chamber to be transported to the first rodless chamber or controls the hydraulic oil in the oil reservoir and the first rodless chamber to be transported to the first rod chamber.

[0010] As a further embodiment of the present invention, the switching mechanism includes a housing, an oil pump section, and a valve section. The oil pump section and the valve section are rotatably disposed within the housing. The housing has a first oil passage and a second oil passage for connecting with the oil pump section. The housing also has a third oil passage and a fourth oil passage for connecting with both ends of the third oil pipe. A motor is disposed within the housing and connected to the oil pump section and the valve section. The motor drives the oil pump section and the valve section to rotate and makes the conduction direction of the third oil pipe the same as that of the oil pump section.

[0011] As a further embodiment of the present invention, the oil pump section includes a second oil pump, the valve section is a one-way valve, the second oil pump and the one-way valve are stacked in sequence, and the motor is connected to the bottom of the one-way valve.

[0012] As a further embodiment of the present invention, the temporary oil tank includes a tank body, a piston, and a third spring. The third spring and the piston are slidably disposed in the tank body from bottom to top, and the oil outlet and the first oil pump are connected to the top of the tank body.

[0013] As a further aspect of the present invention, a control device is also included, which is electrically connected to the first oil pump, the second oil pump, and the motor respectively.

[0014] The beneficial effects of this invention are as follows: By using a hydraulically controlled one-way valve to logically link the mold-closing cylinder and the mold-opening cylinder, a highly efficient cycle is achieved, in which the two cylinders work together to increase pressure during mold closing, the one-way valve self-locks and maintains pressure during mold locking, and the pilot unlocks and quickly retracts during mold opening. This effectively solves the safety hazards of insufficient mold-locking force and easy fatigue of the seal in a single hydraulic cylinder, while avoiding timing conflicts and hydraulic competition when the two cylinders are controlled independently. This significantly improves the response speed, synchronization accuracy, and overall operational safety of mold opening and closing. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the hydraulically controlled check valve of the present invention.

[0018] Figure 3 This is a schematic diagram of the internal structure of the switching mechanism of the present invention.

[0019] Figure 4 This is a schematic diagram of the structure of the second oil pump and the one-way valve of the present invention.

[0020] In the diagram: 1. Mold closing cylinder; 2. Mold opening cylinder; 3. Hydraulic check valve; 31. Valve body; 32. First spring; 33. Valve core; 34. Valve stem; 35. Second spring; 4. Oil reservoir; 5. Temporary oil tank; 6. First oil pump; 7. Switching mechanism; 71. Housing; 72. Second oil pump; 73. Check valve; 74. Motor; 8. First oil pipe; 9. Second oil pipe; 10. Third oil pipe; 11. Moving mold. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-4The present invention discloses an integrated structure of a short full-oil valve at the top of a mold cylinder and a double-sided rapid cylinder, comprising a mold-closing cylinder 1 and two sets of mold-separating cylinders 2. The lifting rods of the mold-closing cylinder 1 and the two sets of mold-separating cylinders 2 are connected to a moving mold 11. A hydraulically controlled one-way valve 3 is connected between the mold-closing cylinder 1 and the mold-separating cylinder 2. The first rod-side chamber and the first rodless chamber of the mold-separating cylinder 2 are interconnected and connected to an oil reservoir 4 through a switching assembly. The switching assembly is used to control the flow direction of hydraulic oil between the oil reservoir 4 and the first rod-side chamber and the first rodless chamber. The mold-closing cylinder 1 includes a second rod chamber and a second rodless chamber. A first oil pump 6 is provided between the mold-closing cylinder 1 and the hydraulic control check valve 3 to deliver hydraulic oil in the second rod chamber in the forward direction to the second rodless chamber to control the descent of the moving mold 11. The first rod chamber is connected to the control port of the hydraulic control check valve 3. The switching component delivers oil and causes the mold-separating cylinder 2 to rise, unlocking the hydraulic control check valve 3 and pressurizing the hydraulic oil in the second rod chamber to deliver it in the reverse direction to the second rodless chamber to control the rise of the moving mold 11.

[0023] When the mold closing action (moving mold 11 descends) is required, the first oil pump 6 starts. At this time, the hydraulic control check valve 3 is in the forward-opening state. The hydraulic oil in the second rod chamber of the mold closing cylinder 1 is drawn out by the first oil pump 6 and delivered forward to the second rodless chamber through the hydraulic control check valve 3, pushing the piston rod of the mold closing cylinder 1 to extend, thereby driving the moving mold 11 to descend. At the same time, the switching component controls the hydraulic oil in the oil tank 4 to be preferentially replenished to the first rodless chamber of the mold parting cylinder 2, so that the piston rod of the mold parting cylinder 2 also extends synchronously to assist in mold closing. After the mold is closed, the hydraulic control check valve 3 is locked by the oil pressure in the mold parting cylinder 2 to prevent the oil in the mold closing cylinder 1 from flowing back, thus achieving pressure holding.

[0024] When the mold opening action (moving mold 11 rises) is required, the switching component changes the direction of the oil circuit, causing the hydraulic oil in the oil tank 4 to preferentially enter the first rod chamber of the mold parting cylinder 2. The pressure in the first rod chamber increases, and this pressurized oil simultaneously acts on the control port of the hydraulic check valve 3, pushing the valve core 33 to open the reverse oil circuit. Subsequently, the first rod chamber continues to receive oil, pushing the piston rod of the mold parting cylinder 2 to rise. At the same time, the hydraulic oil in the second rodless chamber of the mold closing cylinder 1 is compressed, flows in the reverse direction through the hydraulic check valve 3 to the second rod chamber, and is finally pushed back to the oil tank 4 or the temporary oil tank 5, thus completing the smooth rise of the moving mold 11.

[0025] By using a hydraulically controlled one-way valve 3 to logically link the mold-closing cylinder 1 and the mold-separating cylinder 2, a highly efficient cycle is achieved: coordinated pressurization of the two cylinders during mold closing, self-locking pressure maintenance by the hydraulically controlled one-way valve 3 during mold locking, and pilot unlocking and rapid retraction during mold opening. This effectively solves the safety hazards of insufficient mold-locking force and easy fatigue of the seal in a single hydraulic cylinder, while avoiding timing conflicts and hydraulic competition when the two cylinders are controlled independently. This significantly improves the response speed, synchronization accuracy, and overall operational safety of mold opening and closing.

[0026] As a further embodiment of the present invention, the hydraulically controlled one-way valve 3 includes a valve body 31, a valve stem 34, a valve core 33, and a first spring 32. The valve body 31 includes interconnected inlet / outlet oil passages and a control oil passage. The two ends of the inlet / outlet oil passages are respectively connected to the outside of the valve body 31, forming an inlet and an outlet. The first spring 32 and the valve core 33 are disposed within the inlet / outlet oil passages, with the first spring 32 positioned between the inner wall of the inlet / outlet oil passage and the rear end of the valve core 33. The valve core 33 is pushed to control the forward flow of the oil passage from the oil inlet to the oil outlet. The valve stem 34 is slidably disposed in the control oil passage and abuts against the front end of the valve core 33. The control oil passage is connected to the outside of the valve body 31 and forms a control oil port. The control oil port is pressurized and drives the valve stem 34 to push the valve core 33 to reverse the flow from the oil outlet to the oil inlet. The second rod chamber is connected to the oil inlet, and the second rodless chamber is connected to the oil outlet.

[0027] During mold closing, the first oil pump 6 draws oil from the oil inlet (connected to the second rod chamber). The oil pressure overcomes the preload of the first spring 32, pushing the valve core 33 to allow the oil to flow from the oil inlet to the oil outlet (connected to the second rodless chamber), which is forward conduction. When pressure holding or mold opening is required, if the pressurized oil from the first rod chamber enters the control port, it pushes the valve rod 34 forward to push the valve core 33, causing the valve core 33 to disengage from the valve seat. At this time, even if the pressure at the oil inlet is lower than that at the oil outlet, the oil can flow in reverse from the oil outlet to the oil inlet, achieving reverse conduction.

[0028] The hydraulically controlled check valve 3 of this structure integrates the functions of free flow in the forward direction and controlled opening in the reverse direction. Its direct-push design of valve core 33 and valve stem 34 ensures sensitive response and reliable sealing. Connecting it in series between the inlet and outlet oil circuits of the mold closing cylinder 1 ensures efficient unidirectional oil supply during mold closing and precise unlocking through the pilot oil pressure of the mold opening cylinder 2 during mold opening. The structure is compact and the control logic is clear.

[0029] As a further embodiment of the present invention, the hydraulic control check valve 3 further includes a second spring 35, which is disposed in the control oil passage and abuts against the valve stem 34. The second spring 35 is used to push the valve stem 34 to reset.

[0030] When the pilot pressure at the control port disappears (i.e., the first rod chamber of the mold-separating cylinder 2 is depressurized), the elastic force of the second spring 35 will actively push the valve stem 34 backward, causing it to disengage from the valve core 33. At this time, the valve core 33 is only pressed back onto the valve seat by the force of the first spring 32, and the hydraulic check valve 3 returns to its normal state of forward conduction and reverse cut-off.

[0031] The addition of a second spring 35 provides the valve stem 34 with active reset capability, avoiding the failure of the valve stem 34 to return to its original position due to hydraulic oil stickiness or slight jamming of the valve stem 34. This ensures that the hydraulic control check valve 3 can quickly and reliably restore the reverse shut-off function after each mold opening action, thereby ensuring that the clamping force does not leak in the mold closing state and improving the long-term operational stability of the equipment.

[0032] As a further embodiment of the present invention, a temporary oil tank 5 is provided between the first oil pump 6 and the oil outlet. The temporary oil tank 5 is used to pressurize and regulate the oil volume difference between the second rod chamber and the second rodless chamber.

[0033] Because the piston rod of the mold-closing cylinder 1 has volume, the volumes of the second rod-side cavity and the second rodless cavity are not equal. During mold closing, the first oil pump 6 draws less oil from the second rod-side cavity than the amount of oil needed to be injected into the second rodless cavity (or vice versa). The temporary oil tank 5 acts as an oil quantity compensation element. During mold closing, the first oil pump 6 draws oil from the second rod-side cavity and simultaneously replenishes some oil from the temporary oil tank 5, sending it into the second rodless cavity. During mold opening, the oil flowing back from the second rodless cavity is replenished to the second rod-side cavity, and any excess oil is stored in the temporary oil tank 5.

[0034] The temporary oil tank 5 cleverly solves the problem of flow imbalance caused by the difference in piston rod volume in the differential cylinder. It not only buffers the pressure fluctuations at the inlet and outlet of the first oil pump 6, but also acts as an energy storage element to provide instantaneous large flow support during rapid operation, making the lifting and lowering action of the moving mold 11 more stable and continuous, and avoiding motion jamming or cavitation caused by insufficient flow.

[0035] As a further embodiment of the present invention, the switching assembly includes a first oil pipe 8, a second oil pipe 9, a third oil pipe 10, and a switching mechanism 7. One end of the first oil pipe 8 and the second oil pipe 9 are connected to the oil reservoir 4, and the other end is connected to the first rod chamber and the first rodless chamber, respectively. Both ends of the third oil pipe 10 are connected to the first rod chamber and the first rodless chamber, respectively. The first rod chamber and the first rodless chamber are both connected to the switching mechanism 7. The switching mechanism 7 controls the hydraulic oil in the oil reservoir 4 and the first rod chamber to be transported to the first rodless chamber or controls the hydraulic oil in the oil reservoir 4 and the first rodless chamber to be transported to the first rod chamber.

[0036] When the moving mold 11 needs to descend, the switching mechanism 7 controls the first oil pipe 8 to open, allowing the oil in the oil tank 4 to enter the first rod chamber through the first oil pipe 8. At the same time, the oil in the first rod chamber is pumped to the first rodless chamber through the third oil pipe 10, achieving differential rapid extension. When the moving mold 11 needs to rise, the switching mechanism 7 switches the oil circuit, controlling the second oil pipe 9 to open, allowing the oil in the oil tank 4 to enter the first rodless chamber through the second oil pipe 9. At the same time, the oil in the first rodless chamber is pumped to the first rod chamber through the third oil pipe 10, pushing the piston rod to retract rapidly.

[0037] The switching component manages the connection between the two working chambers of the mold-separating cylinder 2 and the oil tank 4 through a switching mechanism 7, and uses a third oil pipe 10 to achieve direct fluid exchange between the two chambers. This self-circulating + oil replenishment oil circuit design significantly reduces the dependence on the external oil tank 4 and the oil suction resistance, enabling the mold-separating cylinder 2 to achieve ultra-high speed movement under low pressure and high flow conditions, meeting the process requirements of rapid mold opening and closing.

[0038] As a further embodiment of the present invention, the switching mechanism 7 includes a housing 71, an oil pump section, and a valve section. The oil pump section and the valve section are rotatably disposed within the housing 71. The housing 71 has a first oil passage and a second oil passage for connecting with the oil pump section. The housing 71 also has a third oil passage and a fourth oil passage for connecting with both ends of the third oil pipe 10. A motor 74 is disposed within the housing 71 and connected to the oil pump section and the valve section. The motor 74 drives the oil pump section and the valve section to rotate and makes the conduction direction of the third oil pipe 10 the same as that of the oil pump section.

[0039] The motor 74 drives the oil pump unit and valve unit to rotate as a whole within the housing 71. When rotated to the first working position, the oil pump unit's suction port connects to the first oil passage (connecting to the first rod chamber), and the oil discharge port connects to the third oil passage (connecting to the third oil pipe 10). Simultaneously, the valve unit allows oil to flow from the third oil pipe 10 through the fourth oil passage to the first rodless chamber, forming a forward pumping circuit. When the motor 74 drives it to rotate 180 degrees to the second working position, the oil pump unit's suction port connects to the second oil passage (connecting to the first rodless chamber), and the oil discharge port connects to the fourth oil passage. The valve unit switches direction, allowing oil to flow from the third oil pipe 10 through the third oil passage to the first rod chamber, forming a reverse pumping circuit.

[0040] The integrated switching mechanism 7 integrates the oil pump and check valve 73 into a single rotating housing 71, allowing for complete switching of the oil circuit direction via the rotation of a single motor 74. Compared to traditional solutions using multiple solenoid directional valves, this structure features a shorter internal flow path, lower pressure loss, faster response, and eliminates the risk of solenoid valve jamming or coil burnout, significantly improving the reliability of switching and the synchronization of actions.

[0041] As a further embodiment of the present invention, the oil pump section includes a second oil pump 72, the valve section is a one-way valve 73, the second oil pump 72 and the one-way valve 73 are stacked in sequence, and the motor 74 is connected to the bottom of the one-way valve 73.

[0042] The second oil pump 72 provides the pumping power, while the check valve 73 ensures that the oil does not flow backward when the pump stops. Both are stacked and coaxially arranged. The motor 74 shaft is directly or via a coupling connected to the bottom of the rotating part of the check valve 73, thereby driving the entire stacked assembly to rotate. Regardless of the rotation angle, the oil discharge direction of the second oil pump 72 always aligns with the conduction direction of the check valve 73, achieving the mechanical logic that the valve allows flow wherever the pump goes.

[0043] The stacked design maximizes the use of axial space and reduces radial dimensions, resulting in an extremely compact overall structure for the switching mechanism 7, which can be easily integrated into the limited space at the top of the mold cylinder. The motor 74 directly drives the bottom of the one-way valve 73, with a short transmission chain, eliminating transmission backlash and ensuring high-precision synchronization between valve switching and pump rotation.

[0044] As a further embodiment of the present invention, the temporary oil tank 5 includes a tank body, a piston, and a third spring. The third spring and the piston are slidably disposed in the tank body from bottom to top. The oil outlet and the first oil pump 6 are connected to the top of the tank body.

[0045] When the second rod-side chamber of the mold-closing cylinder 1 supplies oil to the second rodless chamber, if there is excess oil, the excess oil will enter the top of the temporary oil tank 5, pushing the piston downwards to compress the third spring. When the system needs to replenish oil, the compressed third spring pushes the piston upwards, pushing the stored oil back into the pipeline. If there is insufficient oil, the piston will float upwards under the action of the spring force, providing back pressure to the system.

[0046] The temporary oil tank 5 of this structure uses a spring-loaded piston, which is a passive adaptive volume compensation device. It does not require external control signals and automatically adjusts the oil storage volume in a purely mechanical manner according to changes in system pressure. It has a fast response speed and can buffer and dampen the oil circuit system, effectively absorbing pressure peaks at the moment of mold closing and when the mold is opened.

[0047] As a further aspect of the present invention, a control device is also included, which is electrically connected to the first oil pump 6, the second oil pump 72, and the motor 74, respectively.

[0048] The control device (such as a PLC or dedicated controller) has preset process sequences for mold closing, mold locking, mold opening, and ejection. During mold closing, the control device simultaneously issues commands to start the first oil pump 6 and the second oil pump 72, and drives the motor 74 to rotate to the mold closing position. During mold opening, the control device first commands the switching component (motor 74) to rotate to the mold opening position. After detecting the establishment of pressure in the first rod-shaped cavity, it then coordinates the rotation or flow rate of the first oil pump 6 and the second oil pump 72. The control device also monitors the pressure and displacement sensor signals of each oil cavity in real time, forming a closed-loop control. Through unified control device coordination of electrical signals, centralized and precise control of the mold closing cylinder 1 and the double-sided mold parting cylinder 2 is achieved. The control device can automatically match the optimal mold opening and closing speed and clamping force curve according to different mold weights and process requirements, and can perform fully automatic interlocking control with other molding processes (such as injection, pressure holding, and ejection), significantly improving the intelligence level and production efficiency of the equipment.

[0049] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. An integrated structure of a short full-fill valve at the top of a mold cylinder and a double-sided rapid-actuator, characterized in that: The device includes a mold-closing cylinder and two sets of mold-separating cylinders. The lifting rods of the mold-closing cylinder and the two sets of mold-separating cylinders are connected to the moving mold. A hydraulically controlled check valve is connected between the mold-closing cylinder and the mold-separating cylinder. The first rod-side chamber and the first rodless chamber of the mold-separating cylinder are interconnected and connected to an oil tank through a switching assembly. The switching assembly is used to control the flow direction of hydraulic oil between the oil tank and the first rod-side chamber and the first rodless chamber. The mold-closing cylinder includes a second rod-side chamber and a second rodless chamber. A first oil pump is provided between the mold-closing cylinder and the hydraulically controlled check valve to deliver hydraulic oil in the second rod-side chamber in a forward direction to the second rodless chamber to control the descent of the moving mold. The first rod-side chamber is connected to the control port of the hydraulically controlled check valve. The switching assembly delivers oil and causes the mold-separating cylinder to rise, unlocking the hydraulically controlled check valve and pressurizing the hydraulic oil in the second rod-side chamber to reverse and deliver it to the second rodless chamber to control the rise of the moving mold.

2. The integrated structure of the top short full-oil valve and the double-sided rapid cylinder according to claim 1, characterized in that: The hydraulic check valve includes a valve body, a valve stem, a valve core, and a first spring. The valve body includes an inlet / outlet oil passage and a control oil passage that are interconnected. The two ends of the inlet / outlet oil passage are respectively connected to the outside of the valve body and form an inlet and an outlet. The first spring and the valve core are disposed in the inlet / outlet oil passage, with the first spring located between the inner wall of the inlet / outlet oil passage and the rear end of the valve core. The first spring pushes the valve core to control the forward flow of the inlet / outlet oil passage from the inlet to the outlet. The valve stem is slidably disposed in the control oil passage and abuts against the front end of the valve core. The control oil passage is connected to the outside of the valve body and forms a control oil port. The control oil port is pressurized and drives the valve stem to push the valve core to reverse the flow from the outlet to the inlet. The second rod-side chamber is connected to the inlet, and the second rodless chamber is connected to the outlet.

3. The integrated structure of the top short full-oil valve and the double-sided fast cylinder according to claim 2, characterized in that: The hydraulic check valve also includes a second spring, which is disposed in the control oil passage and abuts against the valve stem. The second spring is used to push the valve stem to reset.

4. The integrated structure of the top short full-oil valve and the double-sided fast cylinder according to claim 3, characterized in that: A temporary oil tank is provided between the first oil pump and the oil outlet. The temporary oil tank is used to pressurize and regulate the oil volume difference between the second rod chamber and the second rodless chamber.

5. The integrated structure of the top short full-oil valve and the double-sided fast cylinder according to claim 4, characterized in that: The switching assembly includes a first oil pipe, a second oil pipe, a third oil pipe, and a switching mechanism. One end of the first and second oil pipes is connected to the oil reservoir, and the other end is connected to the first rod chamber and the first rodless chamber, respectively. Both ends of the third oil pipe are connected to the first rod chamber and the first rodless chamber, respectively. The first rod chamber and the first rodless chamber are both connected to the switching mechanism. The switching mechanism controls the hydraulic oil in the oil reservoir and the first rod chamber to be transported to the first rodless chamber or controls the hydraulic oil in the oil reservoir and the first rodless chamber to be transported to the first rod chamber.

6. The integrated structure of the top short full-oil valve and the double-sided fast cylinder according to claim 5, characterized in that: The switching mechanism includes a housing, an oil pump unit, and a valve unit. The oil pump unit and the valve unit are rotatably disposed within the housing. The housing has a first oil passage and a second oil passage for connecting with the oil pump unit. The housing also has a third oil passage and a fourth oil passage for connecting with both ends of the third oil pipe. A motor is disposed within the housing and connected to the oil pump unit and the valve unit. The motor drives the oil pump unit and the valve unit to rotate and makes the conduction direction of the third oil pipe the same as that of the oil pump unit.

7. The integrated structure of a short full-fill valve at the top of a mold cylinder and a double-sided rapid cylinder according to claim 6, characterized in that: The oil pump section includes a second oil pump, the valve section is a one-way valve, the second oil pump and the one-way valve are stacked in sequence, and the motor is connected to the bottom of the one-way valve.

8. The integrated structure of the top short full-oil valve and the double-sided fast cylinder according to claim 7, characterized in that: The temporary oil tank includes a tank body, a piston, and a third spring. The third spring and the piston are slidably disposed in the tank body from bottom to top. The oil outlet and the first oil pump are connected to the top of the tank body.

9. The integrated structure of a short full-fill valve at the top of a mold cylinder and a double-sided rapid cylinder according to claim 8, characterized in that: It also includes a control device, which is electrically connected to the first oil pump, the second oil pump, and the motor, respectively.

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