Precise proportion metering cylinder capable of adjusting metering volume

Abstract

The utility model discloses a precise proportion metering cylinder capable of adjusting metering volume, which belongs to the technical field of precise metering devices for high-viscosity fluid or paste, and is characterized in that a piston rod is mounted in a cavity of a hydraulic oil cylinder body, the upper end of the piston rod is connected with a hydraulic oil cylinder piston, and the lower end of a displacement sensor is inserted into a blind hole of the piston rod; the hydraulic proportional reversing valve is fixedly mounted on the outer wall of the hydraulic oil cylinder body; the hydraulic driving mechanism is connected with the metering mechanism through a connecting support, a metering cylinder plunger is installed in a cavity of a metering cylinder body, and the lower end of a piston rod sequentially penetrates through a hydraulic oil cylinder body, the upper end and the lower end of the connecting support and a through hole in the upper end of the metering cylinder body to be fixedly connected with the metering cylinder plunger. A first one-way valve is installed at the lower end of the metering cylinder body, and a second one-way valve is installed on the side wall of the metering cylinder body. Compared with the prior art, the metering device has the characteristics of accurately controlling the metering volume of the metering cylinder and controlling the discharge flow of the metering cylinder.

Description

Technical Field

[0001] The utility model relates to the technical field of precision metering devices for high-viscosity fluids or pastes, in particular to a precision proportional metering cylinder with adjustable metering volume. Background Art

[0002] When it comes to precision metering of high-viscosity fluids or pastes, traditional metering methods often struggle to meet the challenges posed by high viscosity. High viscosity not only increases resistance to fluid flow but also complicates precise volume control. While traditional fixed-volume metering cylinders were designed to meet general fluid metering needs, their versatility and flexibility are limited when dealing with high-viscosity materials, making them difficult to meet the diverse, high-precision production requirements.

[0003] To overcome this challenge, modern technology has explored a variety of innovative solutions. Among them, manual adjustment of the metering cylinder plunger stroke provides some flexibility, but its fundamental problem is the lack of automated control. This not only limits production efficiency and accuracy, but also increases the complexity and error rate of manual operation. Therefore, it is not suitable for applications requiring high metering accuracy and a high degree of automation.

[0004] To overcome this bottleneck, the industry has widely adopted a technology combining electric cylinders and servo motors. This solution uses a servo motor to drive a ball screw, enabling precise control of the metering cylinder's plunger stroke. The servo motor's high-precision positioning and rapid response enable the electric cylinder to adjust the metering volume in real time based on actual needs, significantly improving metering accuracy and flexibility. Furthermore, by reading the electric cylinder's position or speed information, the system can achieve closed-loop control, further enhancing metering stability and reliability.

[0005] However, the ball screw structure in traditional electric cylinders has limitations in terms of load capacity and operating pressure. When handling high pressure, the ball screw can be damaged by the excessive pressure, resulting in reduced metering accuracy or even equipment failure. Furthermore, to meet these high-pressure requirements, the electric cylinder often needs to be larger, which not only increases manufacturing costs and space requirements but can also negatively impact production layout and processes. Summary of the Invention

[0006] The purpose of the present invention is to address the deficiencies of the above existing technologies and provide a precision proportional metering cylinder with adjustable metering volume, so as to achieve the purpose of accurately controlling the metering volume of the metering cylinder and controlling the discharge flow rate of the metering cylinder.

[0007] After the oil pump is turned on, the oil pump with stop is turned off, and the oil pump with stop is turned off, and the oil pump with stop is turned off. The end is connected to the oil hole of the hydraulic proportional reversing valve, and the hydraulic proportional reversing valve is fixedly mounted on the outer wall of the hydraulic cylinder body; the hydraulic drive mechanism is connected to the metering mechanism through a connecting bracket, and the metering mechanism includes a metering cylinder body, a metering cylinder plunger, a first one-way valve and a second one-way valve. A metering cylinder plunger is installed in the cavity of the metering cylinder body, and through holes are respectively provided on the upper end of the metering cylinder body, the upper and lower ends of the connecting bracket and the hydraulic cylinder body. The lower end of the piston rod passes through the hydraulic cylinder body, the upper and lower ends of the connecting bracket and the through holes at the upper end of the metering cylinder body in sequence and is fixedly connected to the metering cylinder plunger; the lower end of the metering cylinder body is installed with a first one-way valve, and the side wall of the metering cylinder body is installed with a second one-way valve.

[0008] Furthermore, the upper end of the hydraulic cylinder body is connected to the upper end cover of the hydraulic cylinder, and the lower end is connected to the lower end cover of the hydraulic cylinder.

[0009] Furthermore, a through hole is provided on the upper end cover of the hydraulic cylinder, the lower end of the displacement sensor passes through the through hole of the upper end cover of the hydraulic cylinder and is inserted into the blind hole of the piston rod, and a sealing ring is installed between the upper end of the displacement sensor and the through hole of the upper end cover of the hydraulic cylinder.

[0010] Furthermore, a lubricating oil cup is installed in the connecting bracket, and the lubricating oil cup is sleeved on the outer side of the piston rod and slidably cooperates with the piston rod.

[0011] Furthermore, the first one-way valve includes a first columnar valve core, a connecting ring and a compression spring. The lower end of the metering cylinder body is provided with an inlet hole, the first columnar valve core is placed in the inlet hole, the upper end of the first columnar valve core is flush with the lower end wall of the metering cylinder body, the first columnar valve core is provided with a blind hole, and the side wall of the first columnar valve core is provided with a plurality of through holes evenly distributed in a circular shape. The through holes on the side wall of the first columnar valve core are connected with its blind holes, the lower end of the first columnar valve core is fixedly connected to the connecting ring, the lower end of the metering cylinder body is provided with an annular groove, the connecting ring is inserted in the annular groove, and is connected to the end wall of the annular groove through a compression spring.

[0012] Furthermore, the second one-way valve includes a second cylindrical valve core, a valve body and a compression spring. The valve body is fixedly installed on the side wall of the metering cylinder body. The valve body is provided with a stepped through hole, which is connected to the cavity of the metering cylinder body. The two ends of the stepped through hole are small-diameter holes, and the middle is a large-diameter hole. The second cylindrical valve core is installed in the stepped through hole and slides with the stepped through hole. The inner end of the second cylindrical valve core is an arc-shaped surface, and the arc-shaped surface of the second cylindrical valve core corresponds to the shape of the inner wall of the cavity of the metering cylinder body. The outer end of the second cylindrical valve core is provided with a blind hole, and the side wall of the second cylindrical valve core is provided with a plurality of through holes evenly distributed in a circular shape. The through holes on the side wall of the second cylindrical valve core are connected to its blind hole. A compression spring is installed in the blind hole of the second cylindrical valve core, one end of the compression spring is connected to the end wall of the blind hole of the second cylindrical valve core, and the other end is connected to the valve body.

[0013] Compared with the prior art, the present invention has the following outstanding beneficial effects:

[0014] 1. The utility model can detect the position of the hydraulic cylinder piston through a displacement sensor, determine the position movement distance of the cylinder piston, and then determine the movement distance of the metering cylinder plunger, and finally calculate the volume of the fluid sucked into the metering cylinder; by controlling the electromagnet current of the proportional reversing valve, the running speed of the hydraulic cylinder piston is controlled, thereby controlling the discharge flow of the metering cylinder;

[0015] 2. The upper end of the first columnar valve core of the utility model is flush with the lower end wall of the metering cylinder body, and the compression spring of the first one-way valve is located outside the metering cylinder body, thereby not occupying the volume of the internal cavity of the metering cylinder, making the measured fluid volume more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the utility model;

[0017] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0018] Figure 3 yes Figure 2 A partial enlarged view of part A;

[0019] Figure 4 yes Figure 2 A partial enlarged view of part B;

[0020] 1. Hydraulic drive mechanism, 11. Displacement sensor, 12. Hydraulic proportional reversing valve, 13. Hydraulic cylinder body, 14. Hydraulic cylinder upper end cover, 15. Piston rod, 16. Hydraulic cylinder piston, 17. Hydraulic cylinder lower end cover, 2. Metering mechanism, 21. Metering cylinder body, 22. Second one-way valve, 221. Valve body, 222. Second cylindrical valve core, 23. First one-way valve, 231. Connecting ring, 232. First cylindrical valve core, 24. Metering cylinder plunger, 3. Connecting bracket, 31. Lubricating oil cup. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings and specific implementation methods.

[0022] like Figure 1 and 2 As shown, the utility model includes a hydraulic drive mechanism 1 and a metering mechanism 2.

[0023] The hydraulic drive mechanism 1 includes a hydraulic cylinder body 13, a displacement sensor 11, a hydraulic cylinder piston 16 and a hydraulic proportional reversing valve 12. The hydraulic cylinder body 13 is provided with a cavity. The upper end of the hydraulic cylinder body 13 is connected to the hydraulic cylinder upper end cover 14, and the lower end is connected to the hydraulic cylinder lower end cover 17. A piston rod 15 is installed in the cavity of the hydraulic cylinder body 13, and the upper end of the piston rod 15 is connected to the hydraulic cylinder piston 16. The upper end of the piston rod 15 is provided with a blind hole, and the hydraulic cylinder upper end cover 14 is provided with a through hole. The lower end of the displacement sensor 11 passes through the through hole of the hydraulic cylinder upper end cover 14 and is inserted into the blind hole of the piston rod 15. A sealing ring is installed between the upper end of the displacement sensor 11 and the through hole of the hydraulic cylinder upper end cover 14.

[0024] The hydraulic cylinder piston 16 divides the cavity of the hydraulic cylinder body 13 into two parts, an upper part and an lower part. The hydraulic cylinder body 13 is provided with two oil holes, one end of the two oil holes is respectively connected to the upper and lower cavities of the hydraulic cylinder body 13, and the other end is connected to the oil hole of the hydraulic proportional reversing valve 12. The hydraulic proportional reversing valve 12 is fixedly mounted on the outer wall of the hydraulic cylinder body 13.

[0025] The hydraulic cylinder lower end cover 17 is connected to the metering mechanism 2 through the connecting bracket 3. The metering mechanism 2 includes a metering cylinder body 21, a metering cylinder plunger 24, a first one-way valve 23 and a second one-way valve 22. The upper end of the metering cylinder body 21 is connected to the connecting bracket 3. A metering cylinder plunger 24 is installed in the cavity of the metering cylinder body 21. A through hole is provided at the upper end of the metering cylinder body 21, and through holes are respectively provided at the upper and lower ends of the connecting bracket 3. A through hole is provided on the hydraulic cylinder lower end cover 17. The lower end of the piston rod 15 passes through the through hole of the hydraulic cylinder lower end cover 17, the through holes at the upper and lower ends of the connecting bracket 3, and the through hole at the upper end of the metering cylinder body 21 and is fixedly connected to the metering cylinder plunger 24.

[0026] Sealing rings are installed between the piston rod 15 and the through hole of the lower end cover 17 of the hydraulic cylinder, the through holes at the upper and lower ends of the connecting bracket 3, and the through hole at the upper end of the metering cylinder body 21.

[0027] A lubricating oil cup 31 is installed in the connecting bracket 3 . The lubricating oil cup 31 is sleeved on the outside of the piston rod 15 and is slidably matched with the piston rod 15 .

[0028] like Figure 3 As shown, a first one-way valve 23 is installed at the lower end of the metering cylinder body 21. The first one-way valve 23 can allow the fluid to enter the cavity of the metering cylinder body 21, but cannot allow the fluid to flow out of the first one-way valve 23. The first one-way valve 23 includes a first cylindrical valve core 232, a connecting ring 231 and a compression spring. The lower end of the metering cylinder body 21 is provided with an inlet hole, and the first cylindrical valve core 232 is placed in the inlet hole. The upper end of the first cylindrical valve core 232 is flush with the lower end wall of the metering cylinder body 21, the first cylindrical valve core 232 is provided with a blind hole, and the side wall of the first cylindrical valve core 232 is provided with a plurality of through holes evenly distributed in a circumferential shape. The through holes on the side wall of the first cylindrical valve core 232 are connected with its blind holes, and the lower end of the first cylindrical valve core 232 is fixedly connected to the connecting ring 231. The lower end of the metering cylinder body 21 is provided with an annular groove, and the connecting ring 231 is inserted in the annular groove and connected to the end wall of the annular groove by a compression spring.

[0029] like Figure 4 As shown, a second one-way valve 22 is installed on the side wall of the metering cylinder body 21. The second one-way valve 22 can discharge the fluid in the cavity of the metering cylinder body 21, but cannot allow the fluid to enter in the opposite direction. The second one-way valve 22 includes a second cylindrical valve core 222, a valve body 221 and a compression spring. The side wall of the metering cylinder body 21 is fixedly installed with the valve body 221. The valve body 221 is provided with a stepped through hole, which is connected to the cavity of the metering cylinder body 21. The two ends of the stepped through hole are small diameter holes and the middle is a large diameter hole. The second cylindrical valve core 222 is installed in the stepped through hole. The second cylindrical valve core 222 has an arc-shaped surface, and the arc-shaped surface of the second cylindrical valve core 222 corresponds to the inner wall shape of the cavity of the metering cylinder body 21. The outer end of the second cylindrical valve core 222 is provided with a blind hole, and the side wall of the second cylindrical valve core 222 is provided with a plurality of through holes evenly distributed in a circular shape. The through holes on the side wall of the second cylindrical valve core 222 are connected with its blind hole. A compression spring is installed in the blind hole of the second cylindrical valve core 222, one end of the compression spring is connected to the end wall of the blind hole of the second cylindrical valve core 222, and the other end is connected to the valve body 221.

[0030] The operating process is as follows: When using the present invention, the hydraulic proportional reversing valve 12 is connected to the hydraulic pump and the hydraulic oil tank. The hydraulic proportional reversing valve 12 is used to control the running direction and running speed of the hydraulic cylinder piston 16 and the piston rod 15. The position of the hydraulic cylinder piston 16 is detected by the built-in displacement sensor 11. By controlling the movement distance of the hydraulic cylinder piston 16, the movement distance of the metering cylinder plunger 24 can be controlled, thereby calculating the volume of the fluid sucked into the metering cylinder; by controlling the electromagnet current of the proportional reversing valve, the running speed of the hydraulic cylinder piston 16 is controlled, thereby controlling the discharge flow of the metering cylinder.

[0031] It should be noted that the specific embodiments of the present invention have been described in detail. For those skilled in the art, various obvious changes to the present invention without departing from the spirit and scope of the present invention are within the scope of protection of the present invention.

Claims

1. A precision proportional metering cylinder with adjustable metering volume, characterized by: The invention comprises a hydraulic drive mechanism (1) and a metering mechanism (2), wherein the hydraulic drive mechanism (1) comprises a hydraulic cylinder body (13), a displacement sensor (11), a hydraulic cylinder piston (16) and a hydraulic proportional reversing valve (12), wherein the hydraulic cylinder body (13) is provided with a cavity, a piston rod (15) is installed in the cavity of the hydraulic cylinder body (13), the upper end of the piston rod (15) is connected to the hydraulic cylinder piston (16), the upper end of the piston rod (15) is provided with a blind hole, and the lower end of the displacement sensor (11) is inserted into the blind hole of the piston rod (15); the hydraulic cylinder piston (16) divides the cavity of the hydraulic cylinder body (13) into two parts, the upper and lower parts, and the hydraulic cylinder body (13) is provided with two oil holes, one end of the two oil holes is respectively connected to the upper and lower cavities of the hydraulic cylinder body (13), and the other end is connected to the oil hole of the hydraulic proportional reversing valve (12), and the hydraulic proportional reversing valve ( 12) is fixedly mounted on the outer wall of the hydraulic cylinder body (13); the hydraulic drive mechanism (1) is connected to the metering mechanism (2) through the connecting bracket (3); the metering mechanism (2) includes a metering cylinder body (21), a metering cylinder plunger (24), a first one-way valve (23) and a second one-way valve (22); a metering cylinder plunger (24) is installed in the cavity of the metering cylinder body (21); through holes are respectively provided on the upper end of the metering cylinder body (21), the upper and lower ends of the connecting bracket (3) and the hydraulic cylinder body (13); the lower end of the piston rod (15) passes through the through holes of the hydraulic cylinder body (13), the upper and lower ends of the connecting bracket (3) and the upper end of the metering cylinder body (21) in sequence and is fixedly connected to the metering cylinder plunger (24); the lower end of the metering cylinder body (21) is installed with the first one-way valve (23), and the side wall of the metering cylinder body (21) is installed with the second one-way valve (22).

2. A precision proportional metering cylinder with adjustable metering volume according to claim 1, characterized in that: The upper end of the hydraulic cylinder body (13) is connected to the hydraulic cylinder upper end cover (14), and the lower end is connected to the hydraulic cylinder lower end cover (17).

3. A precision proportional metering cylinder with adjustable metering volume according to claim 2, characterized in that: The hydraulic cylinder upper end cover (14) is provided with a through hole, the lower end of the displacement sensor (11) passes through the through hole of the hydraulic cylinder upper end cover (14) and is inserted into the blind hole of the piston rod (15), and a sealing ring is installed between the upper end of the displacement sensor (11) and the through hole of the hydraulic cylinder upper end cover (14).

4. The precision proportional metering cylinder with adjustable metering volume according to claim 1, characterized in that: A lubricating oil cup (31) is installed in the connecting bracket (3). The lubricating oil cup (31) is sleeved on the outside of the piston rod (15) and is slidably matched with the piston rod (15).

5. The precision proportional metering cylinder with adjustable metering volume according to claim 1, characterized in that: The first one-way valve (23) comprises a first columnar valve core (232), a connecting ring (231) and a compression spring. The lower end of the metering cylinder body (21) is provided with an inlet hole. The first columnar valve core (232) is placed in the inlet hole. The upper end of the first columnar valve core (232) is flush with the lower end wall of the metering cylinder body (21). The first columnar valve core (232) is provided with a blind hole. The side wall of the first columnar valve core (232) is provided with a plurality of through holes evenly distributed in a circumferential shape. The through holes on the side wall of the first columnar valve core (232) are connected to the blind holes. The lower end of the first columnar valve core (232) is fixedly connected to the connecting ring (231). The lower end of the metering cylinder body (21) is provided with an annular groove. The connecting ring (231) is inserted into the annular groove and connected to the end wall of the annular groove via a compression spring.

6. The precision proportional metering cylinder with adjustable metering volume according to claim 1, characterized in that: The second one-way valve (22) includes a second cylindrical valve core (222), a valve body (221) and a compression spring. The valve body (221) is fixedly mounted on the side wall of the metering cylinder body (21). The valve body (221) is provided with a stepped through hole, which is connected to the cavity of the metering cylinder body (21). The two ends of the stepped through hole are small-diameter holes, and the middle is a large-diameter hole. The second cylindrical valve core (222) is installed in the stepped through hole and slides with the stepped through hole. The inner end of the second cylindrical valve core (222) is an arc-shaped surface. The arcuate surface of the second cylindrical valve core (222) corresponds to the shape of the inner wall of the cavity of the metering cylinder body (21), the outer end of the second cylindrical valve core (222) is provided with a blind hole, the side wall of the second cylindrical valve core (222) is provided with a plurality of through holes evenly distributed in a circumferential shape, the through holes on the side wall of the second cylindrical valve core (222) are connected to its blind hole, and a compression spring is installed in the blind hole of the second cylindrical valve core (222), one end of the compression spring is connected to the end wall of the blind hole of the second cylindrical valve core (222), and the other end is connected to the valve body (221).

Images