Mold opening and closing oil way and injection molding machine
By introducing a deceleration check valve and a damping screw into the mold opening and closing hydraulic circuit of the injection molding machine, the problems of braking deceleration and high cost in mold opening and closing control are solved, achieving precise mold opening control and cost optimization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YIZUMI PRECISION MOLDING TECH CO LTD
- Filing Date
- 2025-04-27
- Publication Date
- 2026-05-08
AI Technical Summary
Existing mold opening and closing control schemes for injection molding machines cannot simultaneously achieve braking and deceleration functions and are costly, making it difficult to balance the requirements of positioning accuracy and cost.
Design a mold opening and closing oil circuit, including an oil supply device, an oil tank, a mold locking cylinder, a main valve, a pilot directional valve, a deceleration check valve, and a damping screw. By adding a deceleration check valve and a damping screw between the side end cover of the main valve and the oil supply device, the pressure of the main valve is controlled to achieve the mold opening braking deceleration function, while reducing costs.
It realizes the braking and deceleration function during the mold opening process, improves positioning accuracy, and effectively reduces costs. It is suitable for deceleration motion control of mechanical equipment under high inertia load conditions.
Smart Images
Figure CN224210480U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of injection molding equipment technology, and in particular to an opening and closing oil circuit for a mold and an injection molding machine. Background Technology
[0002] Currently, the mold opening and closing actions of injection molding machines are generally controlled by hydraulic circuits, which require high mold opening and closing positioning accuracy as well as low cost. Therefore, designing an affordable and easy-to-use mold opening and closing control scheme that balances performance and cost requirements is one of the key points and challenges in hydraulic circuit design.
[0003] In the existing technology, one control scheme is to use a common hydraulic directional valve for mold opening and closing control; however, the mold opening process cannot achieve the braking and deceleration function, resulting in long mold opening and deceleration time and poor positioning accuracy; another control method is to use a proportional valve for mold opening and closing control; although the braking and deceleration function can be achieved during the mold opening process, the cost of the proportional valve is relatively high.
[0004] It should be noted that the above content is only used to help understand the technical solution of this utility model, and does not represent an admission that the above content is prior art. Utility Model Content
[0005] The main purpose of this invention is to propose an opening and closing oil circuit and an injection molding machine, which aims to achieve braking and deceleration during the mold opening process, while effectively reducing costs.
[0006] To achieve the above objectives, this utility model proposes an opening and closing mold oil circuit, which includes an oil supply device, an oil tank, a mold locking cylinder, a main valve, a pilot directional valve, a deceleration check valve, and a damping screw.
[0007] The main valve includes a main valve body, a main valve core, a first side end cover, and a second side end cover. A return spring is provided between the main valve core and the first side end cover and the second side end cover.
[0008] The main valve body includes a first oil inlet, a first oil outlet, a first working oil port, and a second working oil port. The first oil inlet is connected to the oil supply device, the first oil outlet is connected to the oil tank, the first working oil port is connected to the rodless chamber of the mold-locking cylinder, and the second working oil port is connected to the rod-side chamber of the mold-locking cylinder.
[0009] The pilot directional valve includes a second oil inlet, a second oil outlet, a third working oil outlet, and a fourth working oil outlet. The second oil inlet is connected to the oil supply device, the second oil outlet is connected to the oil tank, and the third and fourth working oil outlets are respectively connected to the first side end cap and the second side end cap of the main valve.
[0010] The deceleration check valve and the damping screw are disposed in the oil passage between the first side end cap of the main valve and the oil supply device; during mold opening braking buffering, the deceleration check valve and the damping screw control the pressure of the first side chamber of the main valve.
[0011] Optionally, the flow direction of the deceleration check valve is set to the direction from the first side end cap of the main valve to the oil supply device.
[0012] Optionally, the deceleration check valve includes a deceleration spring and a deceleration ball connected together, with the deceleration spring located on the side of the deceleration ball closer to the damping screw.
[0013] Optionally, the damping screw is installed inside the oil passage between the first side end cover and the oil supply device. The damping screw is provided with a flow hole for oil flow, and the diameter of the flow hole is smaller than the channel diameter of the oil passage.
[0014] Optionally, the main valve is configured as a hydraulic directional valve.
[0015] Optionally, the pilot directional valve is configured as a solenoid directional valve.
[0016] Optionally, the pilot directional valve includes a pilot valve core and electromagnets located on the left and right sides of the pilot valve core, the electromagnets being used to push the pilot valve core to move.
[0017] Optionally, the mold opening and closing oil circuit further includes a pilot check valve, which is disposed in the oil circuit between the pilot directional valve and the oil supply device; the flow direction of the pilot check valve is set to the direction from the oil supply device to the pilot directional valve.
[0018] Optionally, the deceleration check valve and the damping screw may also be provided in the oil passage between the second side end cap of the main valve and the oil supply device; during mold closing braking buffering, the deceleration check valve and the damping screw control the pressure of the second side chamber of the main valve.
[0019] This utility model also proposes an injection molding machine, which includes the mold opening and closing oil circuit described in any of the above claims.
[0020] The technical solution of this utility model involves setting a main valve and a pilot directional valve between the oil supply device, the oil tank, and the mold-locking cylinder. The third and fourth working ports of the pilot directional valve are respectively connected to the first and second side end caps of the main valve to control the opening and closing of the main valve. This controls whether pressurized oil can be injected into the rod-side or rodless-side chamber of the mold-locking cylinder through the main valve, thereby realizing the mold-opening and closing action of the mold-locking cylinder. Simultaneously, a deceleration check valve and a damping screw are added to the oil circuit between the first side end cap of the main valve and the oil supply device. During mold opening braking buffering, the pressure in the first side chamber of the main valve is controlled by the combination of the deceleration check valve and the damping screw, causing the opening degree of the main valve to decrease accordingly, thus achieving a braking and deceleration function during mold opening. Furthermore, it eliminates the need for a proportional valve, effectively reducing costs. Attached Figure Description
[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0022] Figure 1 One of the oil circuit structure diagrams of an embodiment of the mold opening and closing oil circuit provided by this utility model;
[0023] Figure 2 This is a schematic diagram of a structure of an embodiment of the mold opening and closing oil circuit provided by this utility model;
[0024] Figure 3 The second diagram shows the oil circuit structure of one embodiment of the mold opening and closing oil circuit provided by this utility model.
[0025] Explanation of reference numerals in the attached figures:
[0026] 10. Oil supply device; 20. Oil tank; 30. Mold locking cylinder; 31. Rodless chamber; 32. Rod chamber; 40. Main valve; 41. Main valve body; 42. Main valve core; 43. First side end cover; 44. Second side end cover; 45. Return spring; 50. Pilot directional valve; 51. Pilot valve core; 52. Electromagnet; 60. Deceleration check valve; 70. Damping screw; 80. Pilot check valve;
[0027] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0028] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, what is described is only a part of the embodiments of this utility model, and not all of the embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.
[0029] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.
[0030] Furthermore, it should be noted that the descriptions involving "first," "second," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.
[0031] This utility model proposes an oil circuit for opening and closing molds. (Refer to...) Figures 1 to 2 In one embodiment of this utility model, the mold opening and closing oil circuit includes an oil supply device 10, an oil tank 20, a mold locking cylinder 30, a main valve 40, a pilot directional valve 50, a deceleration check valve 60, and a damping screw 70, wherein...
[0032] The main valve 40 includes a main valve body 41, a main valve core 42, a first side end cover 43 and a second side end cover 44, and a return spring 45 is provided between the main valve core 42 and the first side end cover 43 and the second side end cover 44.
[0033] The main valve body 41 includes a first oil inlet P1, a first oil outlet T1, a first working oil outlet A1, and a second working oil outlet B1. The first oil inlet P1 is connected to the oil supply device 10, the first oil outlet T1 is connected to the oil tank 20, the first working oil outlet A1 is connected to the rodless chamber 31 of the mold locking cylinder 30, and the second working oil outlet B1 is connected to the rod chamber 32 of the mold locking cylinder 30.
[0034] The pilot directional valve 50 includes a second oil inlet P2, a second oil outlet T2, a third working oil outlet A2, and a fourth working oil outlet B2. The second oil inlet P2 is connected to the oil supply device 10, and the second oil outlet T2 is connected to the oil tank 20. The third working oil outlet A2 and the fourth working oil outlet B2 are respectively connected to the first side end cap 43 and the second side end cap 44 of the main valve 40. That is, the third working oil outlet A2 is connected to the second side chamber V2 on the right side of the main valve 40, wherein the second side end cap 44 corresponds to the second side chamber V2. The fourth working oil outlet B2 is connected to the first side chamber V1 on the left side of the main valve 40, wherein the first side end cap 43 corresponds to the first side chamber V1.
[0035] The deceleration check valve 60 and the damping screw 70 are installed in the oil passage between the first side end cap 43 of the main valve 40 and the oil supply device 10; during the mold opening braking buffer, the deceleration check valve 60 and the damping screw 70 control the pressure of the first side chamber V1 of the main valve 40.
[0036] The technical solution of this utility model involves setting a main valve 40 and a pilot directional valve 50 between the oil supply device 10, the oil tank 20, and the mold-locking cylinder 30. The third working port A2 and the fourth working port B2 of the pilot directional valve 50 are respectively connected to the first side end cap 43 and the second side end cap 44 of the main valve 40 to control the opening and closing of the main valve 40. This controls whether pressurized oil can be injected into the rod chamber 32 or the rodless chamber 31 of the mold-locking cylinder 30 through the main valve 40, thereby realizing the mold-opening and closing action of the mold-locking cylinder 30. Simultaneously, a deceleration check valve 60 and a damping screw 70 are added to the oil circuit between the first side end cap 43 of the main valve 40 and the oil supply device 10. During mold opening braking buffering, the deceleration check valve 60 and the damping screw 70 are used in combination to control the pressure in the first side chamber V1 of the main valve 40, causing the opening degree of the main valve 40 to decrease accordingly, thus achieving a braking and deceleration function during mold opening. Furthermore, it eliminates the need for a proportional valve, effectively reducing costs.
[0037] It should be noted that this application is also applicable to the deceleration motion control of mechanical equipment under other high inertia load conditions, and should also fall within the scope of protection of this application.
[0038] Specifically, the flow direction of the deceleration check valve 60 is set from the first end cap 43 of the main valve 40 to the oil supply device 10. This ensures that the oil flows from the first end cap 43 of the main valve 40 to the oil supply device 10, thereby reducing the pressure in the first chamber V1 of the main valve 40 and ensuring the effective implementation of the technical solution of this application. More specifically, the deceleration check valve 60 includes a deceleration spring and a deceleration ball connected together, with the deceleration spring located on the side of the deceleration ball near the damping screw 70. Understandably, in the design of the spring-type deceleration check valve 60, the elastic force of the deceleration spring directly determines the valve's opening threshold. That is, when the pressure on the first chamber V1 side is greater than the pressure on the oil supply device 10 side, and the pressure on the first chamber V1 side exceeds the elastic force of the deceleration spring, its pressure value overcomes the elastic force of the deceleration spring, pushing the deceleration ball towards the damping screw 70, so that the oil can flow through the deceleration check valve 60 to the oil supply device 10 side. When the pressure on the first side chamber V1 is equal to the pressure on the side of the oil supply device 10, the deceleration ball closes the oil passage under the elastic force of the deceleration spring, and the oil cannot flow between the first side end cover 43 of the main valve 40 and the oil supply device 10.
[0039] There are many specific structures for the damping screw 70. In this embodiment, the damping screw 70 is installed inside the oil passage between the first side end cover 43 and the oil supply device 10. The damping screw 70 has a flow hole for oil flow, and the diameter of the flow hole is smaller than the channel diameter of the oil passage. Because the diameter of the flow hole in the damping screw 70 is smaller than the channel diameter of the oil passage, the flow velocity of the oil decreases when it flows through the damping screw 70, thereby reducing the pressure drop rate in the first side chamber V1 of the main valve 40. This allows the mold opening action of the mold-locking cylinder 30 to decelerate smoothly, avoiding excessive speed that could cause large vibrations when the mold-locking cylinder 30 moves.
[0040] As an optional implementation, the main valve 40 is configured as a hydraulic directional valve, and the pilot directional valve 50 is configured as a solenoid directional valve. Using commercially available hydraulic and solenoid directional valves as the main valve 40 and pilot directional valve 50 respectively offers a degree of market acceptance. The hydraulic directional valve is a valve structure composed of a main valve body 41, a main valve core 42, a return spring 45, and a sealing ring. It primarily relies on hydraulic pressure to achieve directional control of oil circuit switching. Its core function is to drive the main valve core 42 to move by externally controlled oil pressure, thereby changing the fluid passage. The solenoid directional valve is a valve structure composed of a pilot valve body, a pilot valve core 51, and an electromagnet 52. The electromagnet 52 is located on both sides of the pilot valve core 51. It primarily relies on the electromagnet 52 to achieve directional control of oil circuit switching. Its core function is to drive the pilot valve core 51 to move by energizing the electromagnet 52, thereby changing the fluid passage.
[0041] As an optional implementation, the mold opening and closing oil circuit also includes a pilot check valve 80, which is disposed in the oil circuit between the pilot directional valve 50 and the oil supply device 10; the flow direction of the pilot check valve 80 is set from the oil supply device 10 to the pilot directional valve 50. By setting the pilot check valve 80, the oil is ensured to flow along the designated path, and backflow of oil is avoided in the oil circuit from the oil supply device 10 to the pilot directional valve 50.
[0042] The following section, based on the above embodiments, takes the mold opening deceleration process of this application as an example. Figures 1 to 2 Provide a detailed description;
[0043] During the mold opening process, the electromagnet 52 on the right side of the pilot directional valve 50 is energized, pushing the pilot valve core 51 to move to the left. At this time, the second oil inlet P2 of the pilot directional valve 50 is connected to the fourth working oil port B2, and the second oil outlet T2 is connected to the third working oil port A2. The oil from the oil supply device 10 is injected into the first side chamber V1 on the left side of the main valve 40 through the pilot check valve 80, the second oil inlet P2 of the pilot directional valve 50, and the fourth working oil port B2 in sequence. The oil pressure in the first side chamber V1 pushes the main valve core 42 to move to the right, so that the first oil inlet P1 of the main valve 40 is connected to the second working oil port B1, and the first oil outlet T1 is connected to the first working oil port A1. The pressurized oil from the oil supply device 10 is injected into the rod chamber 32 of the mold locking cylinder 30 through the first oil inlet P1 and the second working oil port B1 of the main valve 40 in sequence, realizing the mold opening action of the mold locking cylinder 30.
[0044] When the mold opening action accelerates or moves at a constant speed, the oil pressure between the oil supply device 10 and the pilot directional valve 50 (defined as the first oil pressure) is equal to the oil pressure in the first side chamber V1 on the left side of the main valve 40 (defined as the second oil pressure), and the second oil pressure is greater than the elastic force of the return spring 45 in the second side chamber V2 on the right side of the main valve 40. At this time, the main valve core 42 is at the rightmost position, that is, in the state of maximum opening.
[0045] During the deceleration process of the mold opening action, the oil supply of the oil supply device 10 decreases, causing the first oil pressure to drop accordingly. At this time, the second oil pressure remains unchanged, making the second oil pressure greater than the first oil pressure. Under the action of the pressure difference between the two oil bodies, the deceleration check valve 60 switches to the flow state, and the oil body can flow through the deceleration check valve 60 and the damping screw 70 in sequence to flow through the oil passage between the oil supply device 10 and the pilot directional valve 50 to balance the pressure of the first oil pressure and the second oil pressure. During this process, when the second oil pressure drops below the elastic force of the return spring 45 in the second side chamber V2 on the right side of the main valve 40, the return spring 45 pushes the main valve core 42 to the left, so that the opening of the first oil inlet P1 connected to the second working oil port B1 and the first oil outlet T1 connected to the first working oil port A1 decreases, forming a throttling effect, forcing the mold locking cylinder 30 to perform a braking and deceleration action. When the second oil pressure further decreases to the point where the pressure difference between the second oil pressure and the first oil pressure is less than the elastic force of the deceleration spring in the deceleration check valve 60, the deceleration check valve 60 switches to a non-flowing state. The oil can no longer flow from the first side end cap 43 of the main valve 40 to the oil supply device 10. That is, at this time, the first oil pressure is slightly lower than the second oil pressure. At this time, the main valve 40 is maintained at the minimum opening state, and the injection molding machine can achieve braking and deceleration under a large throttling state, thus achieving the control effect of mold opening deceleration.
[0046] It is understood that those skilled in the art can conceive of the specific working principle of the mold closing deceleration process of this application based on the above description, so this application will not elaborate on it further.
[0047] As an optional implementation, refer to the appendix. Figure 3 The deceleration check valve 60 and damping screw 70 can also be installed in the oil passage between the second side end cap 44 of the main valve 40 and the oil supply device 10. During mold closing braking buffering, the deceleration check valve 60 and damping screw 70 control the pressure of the second side chamber V2 of the main valve 40. In this embodiment, by also installing the deceleration check valve 60 and damping screw 70 in the oil passage between the second side end cap 44 of the main valve 40 and the oil supply device 10, it can be understood that the second side chamber V2 corresponding to the second side end cap of the main valve 40 mainly controls the mold closing action of the mold locking cylinder 30. At this time, by installing the deceleration check valve 60 and damping screw 70 in its corresponding oil passage, the braking deceleration motion of the mold closing action can be realized. The specific working principle of the mold closing action deceleration process can be referred to the above mold opening action deceleration process, which will not be described in detail in this application.
[0048] This embodiment also discloses an injection molding machine, including the mold opening and closing oil circuit of any of the above embodiments. The specific structure of the mold opening and closing oil circuit can be referred to the above embodiments. Since this injection molding machine adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be elaborated further here.
[0049] It should be noted that the mold opening and closing oil circuit and other contents of the injection molding machine disclosed in this utility model are existing technologies and will not be described in detail here.
[0050] The above are merely optional embodiments of this utility model and do not limit the patent scope of this utility model. Any application of this utility model directly or indirectly in other related technical fields is included within the patent protection scope of this utility model.
Claims
1. A mold opening and closing hydraulic circuit for mold opening braking buffer, characterized in that, This includes an oil supply device, oil tank, mold clamping cylinder, main valve, pilot directional valve, deceleration check valve, and damping screw. The main valve includes a main valve body, a main valve core, a first side end cover, and a second side end cover. A return spring is provided between the main valve core and the first side end cover and the second side end cover. The main valve body includes a first oil inlet, a first oil outlet, a first working oil port, and a second working oil port. The first oil inlet is connected to the oil supply device, the first oil outlet is connected to the oil tank, the first working oil port is connected to the rodless chamber of the mold-locking cylinder, and the second working oil port is connected to the rod-side chamber of the mold-locking cylinder. The pilot directional valve includes a second oil inlet, a second oil outlet, a third working oil outlet, and a fourth working oil outlet. The second oil inlet is connected to the oil supply device, the second oil outlet is connected to the oil tank, and the third and fourth working oil outlets are respectively connected to the first side end cap and the second side end cap of the main valve. The deceleration check valve and the damping screw are disposed in the oil passage between the first side end cap of the main valve and the oil supply device; during mold opening braking buffering, the deceleration check valve and the damping screw control the pressure of the first side chamber of the main valve.
2. The mold opening and closing oil circuit as described in claim 1, characterized in that: The flow direction of the deceleration check valve is set from the first side end cap of the main valve to the oil supply device.
3. The mold opening and closing oil circuit as described in claim 2, characterized in that: The deceleration check valve includes a deceleration spring and a deceleration ball connected together, with the deceleration spring located on the side of the deceleration ball closer to the damping screw.
4. The mold opening and closing oil circuit as described in claim 1, characterized in that: The damping screw is installed inside the oil passage between the first side end cover and the oil supply device. The damping screw has a flow hole for oil flow, and the diameter of the flow hole is smaller than the channel diameter of the oil passage.
5. The mold opening and closing hydraulic circuit as described in any one of claims 1 to 4, characterized in that: The main valve is configured as a hydraulic directional valve.
6. The mold opening and closing hydraulic circuit as described in any one of claims 1 to 4, characterized in that: The pilot directional valve is configured as an electromagnetic directional valve.
7. The mold opening and closing oil circuit as described in claim 6, characterized in that: The pilot directional valve includes a pilot valve core and electromagnets located on the left and right sides of the pilot valve core. The electromagnets are used to push the pilot valve core to move.
8. The mold opening and closing oil circuit as described in claim 1, characterized in that: The mold opening and closing oil circuit also includes a pilot check valve, which is located in the oil circuit between the pilot directional valve and the oil supply device; the flow direction of the pilot check valve is set from the oil supply device to the pilot directional valve.
9. The mold opening and closing oil circuit as described in claim 1, characterized in that: The deceleration check valve and the damping screw can also be installed in the oil passage between the second side end cap of the main valve and the oil supply device; during mold closing braking buffering, the deceleration check valve and the damping screw control the pressure of the second side chamber of the main valve.
10. An injection molding machine, characterized in that: The injection molding machine includes the mold opening and closing oil circuit as described in any one of claims 1 to 9.