Reversing metering cylinder

Abstract

The application relates to an up-down commutation metering cylinder and relates to the technical field of metering cylinders, which comprises a metering cylinder body, a cavity is formed in the metering cylinder body, a piston is slidably installed in the cavity, a driving assembly is arranged on the metering cylinder body, and the driving assembly drives the piston to slide in the cavity. First liquid inlets and second liquid inlets and first liquid outlets and second liquid outlets are formed on the metering cylinder body, liquid enters from the first liquid inlets, is discharged from the second liquid outlets, enters from the second liquid inlets, and is discharged from the first liquid outlets during use. The application integrates the traditional intermittent discharging into continuous output, effectively eliminates flow fluctuation and pulse phenomenon, and improves the stability of a production process and product quality.

Description

Technical Field

[0001] This application relates to the field of metering cylinder technology, and in particular to up-and-down reversing metering cylinders. Background Technology

[0002] Currently, a metering cylinder is essentially an industrial-grade precision "syringe." It achieves high-precision quantitative output of liquids or semi-fluids (such as adhesives, lubricants, and resins) by precisely controlling the movement of the piston within the cylinder. Its core function is not to provide power, but to ensure the reliable and consistent delivery of the same volume of medium each time. It is widely used in industrial scenarios requiring strict proportioning and metering, such as two-component material mixing, automated dispensing, and precision potting.

[0003] In existing fluid metering and conveying systems, the metering cylinder is a widely used key device that uses the reciprocating motion of a piston within the cylinder to achieve quantitative extraction and discharge of the medium. Traditional metering cylinders typically employ a single-piston structure, with its working cycle divided into two independent stages: first, the suction stage, where the piston retracts, the inlet valve opens, and the outlet valve closes, drawing the medium into the cylinder chamber; then, the discharge stage, where the piston advances, the inlet valve closes, and the outlet valve opens, pushing a fixed quantity of medium to the target location.

[0004] However, this traditional working mode has an inherent technical flaw: its suction and discharge actions are sequential and alternating. This means that in a work cycle, nearly half the time is spent suction, during which discharge is interrupted; the other half of the time is spent discharging, during which suction is interrupted. This intermittent working method leads to discontinuous and periodic fluctuations in output flow, making it difficult to achieve truly stable, pulse-free continuous discharge. In applications where process continuity is extremely important, this flow interruption directly affects product quality and production efficiency.

[0005] Therefore, there is an urgent need for a metering cylinder structure that can overcome the inherent contradiction of mutual restraint between suction and discharge actions in the existing technology, thereby providing a continuous, stable, and uninterrupted fluid output solution while improving metering accuracy. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide an up-and-down reversing metering cylinder, which solves the technical problem that the suction and discharge actions of existing metering cylinders interfere with each other, affecting the fluid transport efficiency.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A reversible metering cylinder includes a metering cylinder body, within which a cavity is formed. A piston is slidably mounted within the cavity of the metering cylinder body, dividing the cavity into a first chamber and a second chamber. A driving assembly is provided on one side of the metering cylinder body, driving the piston to reciprocate within the cavity. A first liquid inlet and a second liquid inlet are provided on one side of the metering cylinder body, the first liquid inlet communicating with the first chamber and the second liquid inlet communicating with the second chamber. The metering cylinder body also has a first liquid outlet and a second liquid outlet, the first liquid outlet communicating with the first chamber and the second liquid outlet communicating with the second chamber. A first one-way valve assembly is provided at the first liquid inlet and the second liquid outlet, and a second one-way valve assembly is provided at the second liquid inlet and the first liquid outlet.

[0008] Furthermore, the drive assembly includes an electric cylinder with a piston rod disposed thereon, one end of which passes through the cavity and is connected to the piston.

[0009] Furthermore, a protective cover is installed on one side of the metering cylinder body, and the piston rod passes through the protective cover.

[0010] Furthermore, a counting panel is installed on the protective cover, and an indicator block is provided on the piston rod, the indicator block corresponding to the counting panel.

[0011] Furthermore, a sealing ring is provided on the piston, the sealing ring is sleeved on the piston rod and abuts against the inner side of the cavity, and a pressure plate is provided on the piston and abuts against the piston.

[0012] Furthermore, a guide arc surface is formed on the side of the metering cylinder body near the first liquid inlet and the second liquid inlet, and on the side of the first liquid outlet and the second liquid outlet, and the guide arc surface guides the liquid.

[0013] Furthermore, a guide slope is formed on the inner side of the metering cylinder body, and the guide slope faces the side close to the piston.

[0014] In summary, this application includes at least the following beneficial technical effects of the up-and-down reversing metering cylinder: By setting up a first chamber and a second chamber separated by a piston, and coordinating a first check valve and a second check valve to control the liquid inlet and outlet paths respectively, the first and second chambers alternately perform liquid intake and discharge processes when the drive assembly drives the piston to reciprocate. While one chamber is intake, the other chamber is simultaneously discharging, thus integrating the traditional intermittent discharge into a continuous output, effectively eliminating flow fluctuations and pulsation phenomena, and improving the stability of the production process and product quality. By integrating two working chambers into a single metering cylinder body and using the same piston for drive, the device boasts a highly compact structure, reducing external piping connections and potential leakage points. Simultaneously, the guide arc and guide ramp surfaces on the cylinder body smoothly guide the fluid, reducing flow resistance and turbulence, thereby lowering energy consumption and improving the overall system reliability and lifespan. Using an electric cylinder as the drive component allows for precise control of the piston's displacement and speed, achieving high-precision quantitative delivery. Combined with a counting panel and an indicator block on the piston rod, the piston's stroke position and operating status can be monitored intuitively and in real time, facilitating accurate metering calibration and fault diagnosis. Furthermore, the protective cover safeguards the piston rod, while the sealing ring and pressure plate on the piston ensure the chamber's airtightness. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the up-and-down reversing metering cylinder provided in this application; Figure 2 This is a schematic diagram of the main indicator block structure provided in this application; Figure 3 This is a schematic diagram of the main structure of the metering cylinder body provided in this application; Figure 4 This is a schematic diagram of the piston structure that is the main feature of this application.

[0016] Reference numerals in the attached drawings: 1. Metering cylinder body; 11. Cavity; 12. Piston; 121. First chamber; 122. Second chamber; 123. Sealing ring; 124. Pressure plate; 13. First inlet; 14. Second inlet; 15. First outlet; 16. Second outlet; 17. Guide arc surface; 18. Guide slope; 2. Drive assembly; 21. Servo electric cylinder; 22. Indicator block; 3. Protective cover; 4. First check valve assembly; 5. Second check valve assembly. Detailed Implementation

[0017] In order to make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0018] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0019] This application discloses an up-and-down reversing metering cylinder.

[0020] Reference Figures 1-3The up-and-down reversing metering cylinder includes a metering cylinder body 1, within which a cavity 11 is formed. A piston 12 is slidably mounted within the cavity 11. A drive assembly 2 is provided on the metering cylinder body 1, which drives the piston 12 to slide within the cavity 11. The metering cylinder body 1 has a first inlet 13 and a second inlet 14, as well as a first outlet 15 and a second outlet 16. In use, liquid enters through the first inlet 13 and exits through the second outlet 16, while liquid enters through the second inlet 14 and exits through the first outlet 15.

[0021] Reference Figures 3-4 The internal cavity 11 of the metering cylinder body 1 is cylindrical. The piston 12 is slidably installed inside the cavity 11, tightly dividing it into two independent working chambers: the first chamber 121 and the second chamber 122. To achieve a reliable seal, a sealing ring 123 is embedded on the piston 12, and the outer edge of the sealing ring 123 is tightly fitted to the inner wall of the cavity 11. To further tighten the sealing ring 123, a pressure plate 124 is also provided on the piston 12. In use, the pressure plate 124 is threadedly connected to the piston 12, and the pressure plate 124 presses the sealing ring 123 tightly onto the piston 12.

[0022] The drive assembly 2 is used to drive the piston 12 to perform reciprocating linear motion. The drive assembly 2 is preferably a servo electric cylinder 21. One end of the piston 12 rod of the electric cylinder passes into the cavity 11 of the metering cylinder body 1 and is connected to the piston 12 by threads.

[0023] To reduce interference from external objects on the movement of piston 12 and improve safety, a protective cover 3 is installed on the side of the metering cylinder body 1 corresponding to the insertion of piston 12, through which piston 12 passes. To further facilitate monitoring of the piston 12's stroke position and thus accurately control the metering volume, a transparent counting panel with graduated scales is installed on the protective cover 3. Simultaneously, an indicator block 22 is fixedly installed on piston 12. As piston 12 reciprocates, the indicator block 22 moves accordingly, allowing the operator to visually read the real-time position of piston 12 through the scale indicated by the indicator block 22 on the counting panel.

[0024] On the side wall of the metering cylinder body 1, the first inlet 13 and the first outlet 15 are connected to the first chamber 121. The second inlet 14 and the second outlet 16 are connected to the second chamber 122.

[0025] The metering cylinder body 1 is equipped with a first one-way valve group 4 and a second one-way valve group 5, which are used to control the one-way flow of fluid.

[0026] The first one-way valve assembly 4 is installed at the first inlet 13 and the second outlet 16. The first one-way valve assembly 4 is configured to allow fluid to flow into the first chamber 121 from the first inlet 13 and to allow fluid to flow out from the second chamber 122 through the second outlet 16, but to prohibit reverse flow.

[0027] The second check valve assembly 5 is installed at the second inlet 14 and the first outlet 15. The second check valve assembly 5 is configured to allow fluid to flow into the second chamber 122 from the second inlet 14, and at the same time allow fluid to flow out from the first chamber 121 through the first outlet 15, but prohibits reverse flow.

[0028] It should be noted that the first one-way valve assembly 4 and the second one-way valve assembly 5 are conventional general-purpose components in the art, and their internal structure and one-way opening and closing principle are existing technologies, which will not be described in detail here. The innovation of this embodiment lies in integrating these existing one-way valves into the metering cylinder body 1.

[0029] To optimize the flow path and reduce fluid pressure loss and eddy currents, a guide arc surface 17 is machined into the inner wall of the metering cylinder body 1, specifically on the side near the first inlet 13, the second inlet 14, the first outlet 15, and the second outlet 16. The guide arc surface 17 smoothly guides the inflowing or outflowing liquid. A guide slope 18 is also formed inside the metering cylinder body 1. The guide slope 18 is formed on the inner side of the end of the second cavity 11 and faces the piston 12, which helps to push the liquid out more thoroughly during the discharge phase, reducing residue.

[0030] Initially, piston 12 is located in the middle of cavity 11. When the electric cylinder drives piston 12 rod to move piston 12 towards the side closer to the electric cylinder: The volume of the first chamber 121 decreases, and the internal pressure increases. At this time, the first one-way valve group 4 at the first liquid inlet 13 closes to prevent liquid backflow; while the second one-way valve group 5 at the first liquid outlet 15 opens, and the liquid pre-drawn into the first chamber 121 is discharged through the first liquid outlet 15.

[0031] At the same time, the volume of the second chamber 122 increases, creating a negative pressure inside. At this time, the first check valve group 4 at the second outlet 16 closes; while the second check valve group 5 at the second inlet 14 opens, and external liquid is drawn into the second chamber 122 through the second inlet 14.

[0032] When piston 12 moves away from the electric cylinder, the volume of the second chamber 122 decreases and the pressure increases. The second check valve group 5 at the second inlet 14 closes, and the first check valve group 4 at the second outlet 16 opens, allowing the liquid drawn into the second chamber 122 to be discharged through the second outlet 16.

[0033] At the same time, the volume of the first chamber 121 increases, creating a negative pressure. The second one-way valve group 5 at the first liquid outlet 15 closes, and the first one-way valve group 4 at the first liquid inlet 13 opens, allowing external liquid to be drawn into the first chamber 121 through the first liquid inlet 13.

[0034] In this cycle, each reciprocating motion of piston 12 simultaneously completes the discharge of liquid from one chamber and the suction of liquid from another chamber, achieving continuous and stable fluid output.

[0035] In practical applications, the function of this metering cylinder is not fixed. By changing the installation orientation of the first one-way valve group 4 and the second one-way valve group 5, the inlet and outlet functions on both sides of the metering cylinder body 1 can be interchanged, thereby flexibly adapting to different pipeline connection requirements.

[0036] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A reversing metering cylinder, comprising a metering cylinder body (1), characterized in that: A cavity (11) is formed inside the metering cylinder body (1), and a piston (12) is slidably installed inside the cavity (11) of the metering cylinder body (1), the piston (12) dividing the cavity (11) into a first chamber (121) and a second chamber (122); A drive assembly (2) is provided on one side of the metering cylinder body (1), and the drive assembly (2) drives the piston (12) to reciprocate within the cavity (11); The metering cylinder body (1) has a first liquid inlet (13) and a second liquid inlet (14) on one side. The first liquid inlet (13) is connected to the first chamber (121), and the second liquid inlet (14) is connected to the second chamber (122). The metering cylinder body (1) is also provided with a first liquid outlet (15) and a second liquid outlet (16), the first liquid outlet (15) is connected to the first chamber (121), and the second liquid outlet (16) is connected to the second chamber (122). A first check valve assembly (4) is provided at the first liquid inlet (13) and the second liquid outlet (16), and a second check valve assembly (5) is provided at the second liquid inlet (14) and the first liquid outlet (15).

2. The up-and-down reversing metering cylinder according to claim 1, characterized in that: The drive assembly (2) includes an electric cylinder, on which a piston (12) rod is provided. One end of the piston (12) rod passes into the cavity (11) and is connected to the piston (12).

3. The up-and-down reversing metering cylinder according to claim 2, characterized in that: A protective cover (3) is installed on one side of the metering cylinder body (1), and the piston (12) rod passes through the protective cover (3).

4. The up-and-down reversing metering cylinder according to claim 3, characterized in that: A counting panel is installed on the protective cover (3), and an indicator block (22) is provided on the piston (12) rod, the indicator block (22) corresponding to the counting panel.

5. The up-and-down reversing metering cylinder according to claim 1, characterized in that: A sealing ring (123) is provided on the piston (12), the sealing ring (123) is sleeved on the piston (12) rod, and the sealing ring (123) abuts against the inner side of the cavity (11), and a pressure plate (124) is provided on the piston (12), the pressure plate (124) abuts against the piston (12).

6. The up-and-down reversing metering cylinder according to claim 1, characterized in that: The metering cylinder body (1) has a guide arc surface (17) formed on the side near the first liquid inlet (13) and the second liquid inlet (14) and the side near the first liquid outlet (15) and the second liquid outlet (16), and the guide arc surface (17) guides the liquid.

7. The up-and-down reversing metering cylinder according to claim 1, characterized in that: A guide slope (18) is formed on the inner side of the metering cylinder body (1), and the guide slope (18) faces the side close to the piston (12).

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