Hydraulic impact control system based on fit clearance in injection molding equipment

Abstract

The utility model relates to the technical field of hydraulic impactors, and discloses a fit clearance-based hydraulic impact control system in injection molding equipment, which comprises an impacter body, and an impacter front cavity and an impacter rear cavity are arranged in an inner cavity of the impacter body; through the cooperation among the impactor signal port, the middle cavity signal port, the nitrogen chamber and the reversing valve body, the fit clearance is reduced, meanwhile, the piston is prevented from being clamped, the length of a boss on the valve element is increased, hydraulic pressure changes generated when the piston passes through the two signal ports in a reciprocating mode are converted into alternation of electric signals, and therefore reciprocating motion of hydraulic impact is achieved. According to the hydraulic impacter, the air pressure signal in the nitrogen chamber is converted into a control signal, then the control signal is fed back to the hydraulic impacter, so that intelligent control over the hydraulic impacter is achieved, the working efficiency of the impacter is improved, and the performance of the hydraulic impacter is further optimized by establishing feedback control over the air pressure signal in the nitrogen chamber and the behavior of the hydraulic impacter.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic impactors, in particular to a hydraulic impact control system based on a fitting gap in injection molding equipment. Background Art

[0002] The hydraulic impactor uses hydraulic oil as a medium to control the movement of the piston and make the hydraulic system run stably. Compared with some more traditional engineering machinery, the hydraulic impactor has many advantages, such as strong crushing ability, high efficiency, low noise, etc., so it has been widely used. In recent years, the development and application of programmable logic controllers (PLCs) have made PLCs an advanced industrial control method and widely used in various fields. It has also been gradually used to control hydraulic impactors.

[0003] Four AMESim simulation models of hydraulic impactors were established, with the gap sizes of 0.04, 0.05, 0.06, and 0.07 mm, respectively. When other parameters were the same, the relationship between the gap size and the impact performance of the hydraulic impactor system was analyzed. The results show that when the gap is large, the pressure in the cavity at the front end of the impactor is the highest, which will cause a large leakage and thus a large pressure loss. Therefore, reducing the size of the impactor gap can reduce its end outlet velocity, but it has little effect on the impact characteristics of the entire impact device.

[0004] However, the existing hydraulic impactor is prone to cylinder wall damage during use, which reduces the service life of the hydraulic impactor. Therefore, we need to propose a hydraulic impact control system based on fit clearance in injection molding equipment. Utility Model Content

[0005] The purpose of the utility model is to provide a hydraulic impact control system based on a fitting gap in an injection molding device, optimize the performance of the hydraulic impactor by reducing the gap size, extend the service life of the hydraulic impactor, and further optimize the performance of the hydraulic impactor by establishing feedback control between the air pressure signal in the nitrogen chamber and the behavior of the hydraulic impactor through an automated control system, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a hydraulic impact control system based on a fitting clearance in an injection molding device, comprising an impactor body, an impactor front cavity and an impactor rear cavity being provided in the inner cavity of the impactor body, a valve core being provided between the impactor front cavity and the impactor rear cavity, a piston being provided in the middle part of the outer side of the valve core, a reversing valve front cavity and a reversing valve rear cavity being provided in the inner cavity of the impactor body, a reversing valve body being provided in the reversing valve front cavity and the reversing valve rear cavity, the impactor rear cavity being connected to a nitrogen chamber, a rear cavity oil port being provided at one end of the impactor body for connecting the reversing valve rear cavity and the one-way valve rear cavity, a front cavity oil port being provided at the other end of the impactor body, and an impactor signal port being provided at the front cavity of the impactor.

[0007] Preferably, the front chamber of the impactor is connected to the rear chamber of the reversing valve through an oil circuit, the front chamber of the reversing valve is connected to the oil return port of the reversing valve, the cross-section of the reversing valve body is arranged in a dry shape, and the oil return port of the reversing valve is arranged between the two sets of valve discs of the reversing valve body.

[0008] Preferably, an impact head is provided at the lower end of the valve core, and the axis of the impact head and the axis of the valve core are arranged on the same straight line.

[0009] Preferably, the inner cavity of the impactor body is provided with an intermediate cavity for sliding connection of the piston, and an intermediate cavity signal port is provided on the inner wall of the intermediate cavity.

[0010] Preferably, an intermediate cavity oil return port is provided below the intermediate cavity signal port, and the intermediate cavity oil return port is communicated with the impactor front cavity and the impactor rear cavity respectively.

[0011] Preferably, the impactor signal port and the impactor oil return port are both arranged in a ring shape, and the outer diameter of the impactor signal port is larger than the inner diameter of the impactor front cavity.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] The utility model mainly reduces the fitting clearance while avoiding the piston from being stuck through the coordination between the impactor signal port, the intermediate cavity signal port, the nitrogen chamber and the reversing valve body, extends the length of the boss on the valve core, and converts the hydraulic pressure change of the piston reciprocating through the two signal ports into the alternation of electrical signals, thereby realizing the reciprocating motion of the hydraulic impact, converting the air pressure signal in the nitrogen chamber into a control signal, and then feeding it back to the hydraulic impactor to achieve intelligent control of the hydraulic impactor and improve the working efficiency of the impactor. By establishing feedback control between the air pressure signal in the nitrogen chamber and the behavior of the hydraulic impactor, the performance of the hydraulic impactor is further optimized. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the first stage structure of the utility model;

[0015] Figure 2This is a schematic diagram of the second stage structure of the utility model;

[0016] Figure 3 This is a schematic diagram of the third stage structure of the utility model;

[0017] Figure 4 This is a schematic diagram of the fourth stage structure of the utility model;

[0018] Figure 5 This is a schematic diagram of the flow channel structure in the impactor body of the present utility model.

[0019] In the figure: 1. Impactor front chamber; 2. Impactor signal port; 3. Impactor oil return port; 4. Impactor rear chamber; 5. Nitrogen chamber; 6. Reversing valve front chamber; 7. Reversing valve oil return port; 8. Reversing valve rear chamber; 9. Valve core; 10. Impact head; 11. Reversing valve body; 12. Rear chamber oil port; 13. Intermediate chamber signal port; 14. Intermediate chamber oil return port; 15. Front chamber oil port; 16. Piston; 17. Impactor body. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See also Figure 1-5 The utility model provides a technical solution: a hydraulic impact control system based on fitting clearance in injection molding equipment, comprising an impactor body 17, an impactor front cavity 1 and an impactor rear cavity 4 are provided in the inner cavity of the impactor body 17, a valve core 9 is provided between the impactor front cavity 1 and the impactor rear cavity 4, a piston 16 is provided on the outer middle part of the valve core 9, a reversing valve front cavity 6 and a reversing valve rear cavity 8 are further provided in the inner cavity of the impactor body 17, a reversing valve body 11 is provided in the reversing valve front cavity 6 and the reversing valve rear cavity 8, the impactor rear cavity 4 is connected with a nitrogen chamber 5, one end of the impactor body 17 is provided with a rear cavity oil port 12 for connecting the reversing valve rear cavity 8 and the one-way valve rear cavity, the other end of the impactor body 17 is provided with a front cavity oil port 15, and the impactor front cavity 1 is provided with an impactor signal port 2.

[0022] The front chamber 1 of the impactor is connected to the rear chamber 8 of the reversing valve through an oil circuit. The front chamber 6 of the reversing valve is connected to the oil return port 7 of the reversing valve. The cross-section of the reversing valve body 11 is arranged in a dry shape. The oil return port 7 of the reversing valve is arranged between the two sets of valve discs of the reversing valve body 11. The up and down movement of the reversing valve body 11 is coordinated with the up and down movement of the piston 16, so that the impact head 10 can be accelerated and used.

[0023] An impact head 10 is provided at the lower end of the valve core 9. The axis of the impact head 10 is arranged on the same straight line as the axis of the valve core 9. The synchronous action of the nitrogen chamber 5 and the hydraulic pressure improves the use effect of the hydraulic impactor.

[0024] The inner cavity of the impactor body 17 is provided with an intermediate cavity for sliding connection of the piston 16, and the inner wall of the intermediate cavity is provided with an intermediate cavity signal port 13. The pressure signal after hydraulic adjustment can be converted into an electrical signal through the intermediate cavity, thereby being regulated through the PCL to improve the use effect of the impactor body 17.

[0025] An intermediate cavity oil return port 14 is provided below the intermediate cavity signal port 13. The intermediate cavity oil return port 14 is respectively connected to the impactor front cavity 1 and the impactor rear cavity 4. The larger the gap size, the greater the impact on the hydraulic impactor. By reducing the gap size, the performance of the hydraulic impactor can be optimized and its service life can be extended.

[0026] The impactor signal port 2 and the impactor oil return port 3 are both arranged in a ring shape. The outer diameter of the impactor signal port 2 is larger than the inner diameter of the impactor front chamber 1. During the 16-turn stroke of the piston, starting from the initial value of 2.6MPa, the nitrogen pressure gradually increases until it reaches the stroke reversing pressure of 4.1MPa. The output of the PLC is adjusted to 0. When the pressure reaches 4.1MPa, the output of the PLC is adjusted to 1, and the delay time is 1, that is, a high level, thereby controlling the switching operation of the high-speed oil return valve. Similarly, for the fast opening and closing valve of the oil inlet, the PLC output is just the opposite.

[0027] When the hydraulic impactor's motion cycle is in the first stage ( Figure 1 ), the piston 16 is at the lowest impact point of the stroke. At this time, the impactor front chamber 1 and the reversing valve rear chamber 8 are both in a high-pressure state, and the impactor rear chamber 4 is in a low-pressure state through the reversing valve oil return port 7. Under the action of pressure, the piston 16 moves toward the nitrogen chamber 5 together with the valve stem. At this time, the front end of the piston 16 is located at the impactor signal port 2, and the high-pressure oil in the impactor front chamber 1 flows into the impactor signal port 2, and flows to the reversing valve front chamber 6 through the oil path in the impactor body 17. At the same time, the reversing valve front chamber 6 and the reversing valve rear chamber 8 are both filled with high-pressure oil. Since the force-bearing volume of the valve cavity of the reversing valve front chamber 6 is greater than the force-bearing volume of the reversing valve rear chamber 8, the reversing valve body 11 moves upward. At this time, the nitrogen in the nitrogen chamber 5 is pressed into the cylinder (not shown in the figure) by the valve stem, thereby forming a large pressure, causing the piston 16 to generate a downward stroke force (the second stage is completed at this time). Figure 2 As shown), when the piston 16 is subjected to a downward stroke, it is the third stage (as shown Figure 3As shown), the reversing valve realizes the reversal, so that the high-pressure oil flows into the impactor rear chamber 4 through the reversing valve rear chamber 8, making the rear chamber in a high-pressure state. The force-bearing area of ​​the piston 16 in the impactor rear chamber 4 is larger than that in the impactor front chamber 1, and the pressure in the nitrogen chamber 5 also reaches the maximum value. Under the combined action of the hydraulic pressure and the nitrogen pressure, the piston 16 begins to accelerate and reaches (the fourth stage in the motion cycle, as shown in FIG. Figure 4 As shown), the piston 16 connects the middle cavity, and the lubricating oil in the middle cavity signal port 13 releases the pressure with the reversing valve return oil port 7. At this time, the reversing valve chamber becomes low pressure, and the reversing valve body 11 switches downward. When the reversing is completed, the cavity of the reversing valve is separated from the impactor rear cavity 4 and connected with the oil inlet, so that the reversing valve rear cavity 8 is in a low pressure state again, which is the first stage. In this way, a working cycle is completed, and the reciprocating motion of the hydraulic impactor is completed by alternating changes of the electrical signals of the two impactor signal ports 2 and the middle cavity signal port 13.

[0028] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic impact control system based on a fit clearance in an injection molding device, comprising an impactor body (17), characterized in that: The inner cavity of the impactor body (17) is provided with an impactor front cavity (1) and an impactor rear cavity (4); a valve core (9) is provided between the impactor front cavity (1) and the impactor rear cavity (4); a piston (16) is provided at the middle portion of the outer side of the valve core (9); the inner cavity of the impactor body (17) is also provided with a reversing valve front cavity (6) and a reversing valve rear cavity (8); a reversing valve body (11) is provided in the reversing valve front cavity (6) and the reversing valve rear cavity (8); the impactor rear cavity (4) is connected to a nitrogen chamber (5); one end of the impactor body (17) is provided with a rear cavity oil port (12) for connecting the reversing valve rear cavity (8) and the one-way valve rear cavity; the other end of the impactor body (17) is provided with a front cavity oil port (15); and the impactor front cavity (1) is provided with an impactor signal port (2).

2. The hydraulic impact control system based on fit clearance in the injection molding equipment according to claim 1, characterized in that: The impactor front chamber (1) is connected to the reversing valve rear chamber (8) through an oil circuit, the reversing valve front chamber (6) is connected to the reversing valve oil return port (7), the cross section of the reversing valve body (11) is arranged in a stem shape, and the reversing valve oil return port (7) is arranged between two groups of valve discs of the reversing valve body (11).

3. The hydraulic impact control system based on fit clearance in the injection molding equipment according to claim 2, characterized in that: An impact head (10) is provided at the lower end of the valve core (9), and the axis of the impact head (10) and the axis of the valve core (9) are arranged on the same straight line.

4. The hydraulic impact control system based on fit clearance in the injection molding equipment according to claim 3, characterized in that: The inner cavity of the impactor body (17) is provided with an intermediate cavity for sliding connection of the piston (16), and the inner wall of the intermediate cavity is provided with an intermediate cavity signal port (13).

5. The hydraulic impact control system based on fit clearance in injection molding equipment according to claim 4, characterized in that: An intermediate cavity oil return port (14) is provided below the intermediate cavity signal port (13), and the intermediate cavity oil return port (14) is respectively connected to the impactor front cavity (1) and the impactor rear cavity (4).

6. The hydraulic impact control system based on fitting clearance in the injection molding equipment according to claim 5, characterized in that: The impactor signal port (2) and the impactor oil return port (3) are both arranged in a ring shape, and the outer diameter of the impactor signal port (2) is larger than the inner diameter of the impactor front cavity (1).

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