Friction-free pneumatic balance mechanism for precision measurement

Abstract

The invention discloses a friction-free pneumatic balance mechanism for precision measurement, which comprises a balance cylinder, a piston rod and a piston ring, the piston ring is provided with a rodless cavity air hole and a rod cavity air hole, the rodless cavity air hole is communicated with a rodless cavity groove, and the rod cavity air hole is communicated with a rod cavity groove. According to the mechanism, by optimizing the structures of the piston ring and the balance cylinder and introducing the specific air hole and groove design, friction-free movement of the piston in the cylinder is achieved, the measurement precision and stability are remarkably improved through the design, the problems of abrasion and aging caused by friction in a traditional design are solved, and the measurement accuracy is improved. Therefore, the service life of equipment is prolonged, high precision and quick response of measurement are ensured, and important contributions are made to technical progress and performance improvement of related industries.

Description

Technical Field

[0001] The invention relates to the technical field of precision measuring equipment, in particular to a frictionless pneumatic balancing mechanism for precision measurement. Background Art

[0002] In the field of precision measurement, pneumatic balancing mechanisms play a vital role. They ensure the accuracy and stability of the measurement process by providing stable air pressure support. Traditional pneumatic balancing mechanisms usually use the cooperation of pistons and cylinders to achieve the balancing function, and this cooperation often relies on sealing elements such as O-rings, wear-resistant rings, and guide rings to ensure the sealing of the gas and the smooth movement of the piston.

[0003] However, this traditional design has many shortcomings. First, due to the friction between the sealing element and the piston and cylinder body, a large friction force will be generated, which will not only affect the measurement accuracy, but also accelerate the wear of the sealing element and shorten its service life; second, the friction coefficient of the piston in the balance cylinder of different batches is different. Even if it is the same cylinder, its friction coefficient will change after long-term use. This instability further affects the accuracy of the measurement; in addition, traditional sealing elements are prone to aging. After a period of use, black dirt will appear on the piston rod after wear, which not only pollutes the working environment, but also may have a negative impact on the measurement results.

[0004] In the field of measurement, the stroke of the balanced cylinder is usually longer, and the piston rod is also correspondingly longer. When the rod cavity is under force, the rod bears tension and will not be damaged. However, during the reverse stroke, the cylinder rod bears pressure and is particularly prone to bending after being stressed, which further aggravates the measurement error. Summary of the invention

[0005] In order to overcome the shortcomings of traditional pneumatic balancing mechanisms, the present invention proposes a new frictionless pneumatic balancing mechanism design, which realizes the frictionless movement of the piston in the cylinder by optimizing the structure of the piston ring and the balancing cylinder, as well as the unique air hole and groove design. This design not only significantly improves the measurement accuracy and dynamic response, but also extends the service life of the cylinder, providing a more reliable and efficient solution for the field of precision measurement.

[0006] A frictionless pneumatic balancing mechanism for precision measurement, comprising: a balancing cylinder, a piston ring installed inside the balancing cylinder, a piston rod installed on the piston ring, a micrometer-level static pressure gap is provided between the outer surface of the piston ring and the inner wall of the balancing cylinder, the piston ring divides the interior of the balancing cylinder into a rodless chamber on the left and a rod chamber on the right, a rodless chamber air hole is provided on the left side of the piston ring, and the rodless chamber air hole is connected to the rodless chamber groove; a rod chamber air hole is provided on the right side of the piston ring, and the rod chamber air hole is connected to the rod chamber groove, and the rodless chamber groove and the rod chamber groove are provided around the outer surface of the piston ring.

[0007] As a preferred solution of the present invention, the rod cavity groove and the rodless cavity groove are both annular grooves, and the groove openings are arranged corresponding to the inner wall of the balancing cylinder.

[0008] As a preferred solution of the present invention, the rodless cavity air holes are provided in two numbers and are symmetrically arranged on the upper and lower sides of the piston ring.

[0009] As a preferred solution of the present invention, the number of the rod chamber air holes is two and they are symmetrically arranged on the front and rear sides of the piston ring.

[0010] As a preferred solution of the present invention, the rod cavity groove is arranged on the left side of the rodless cavity groove.

[0011] As a preferred solution of the present invention, a flexible connection mechanism is provided at the connection between the piston ring and the piston rod.

[0012] As a preferred solution of the present invention, the flexible connection mechanism includes a connecting seat and a movable connecting rod, the connecting seat is fixedly installed at the center position of the piston ring, the movable connecting rod is installed on the connecting seat through a spherical head, and the other end of the movable connecting rod is connected to the piston rod.

[0013] As a preferred solution of the present invention, a flexible connection mechanism is installed at the end of the extended end of the piston rod.

[0014] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0015] The frictionless pneumatic balancing mechanism of the present invention has significant advantages over traditional designs. By eliminating the friction between the piston and the cylinder wall, the measurement accuracy and stability are greatly improved, making the measurement results more reliable. Secondly, since there is no need to rely on traditional sealing elements, the mechanism of this solution avoids performance degradation caused by wear and aging of sealing elements, thereby extending the service life of the equipment and reducing maintenance and replacement costs. In addition, the design of the mechanism enables the piston to move multiple times, reciprocatingly, quickly, or even crawl in the cylinder without generating friction, which is particularly important for measurement applications that require high precision and fast response. The connection between the piston ring and the piston rod is a flexible connection, which reduces errors caused by deformation of the pull rod or small changes in the pulling angle during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a front view structural cross-sectional view of the piston ring of the present invention;

[0018] Figure 3 It is a top view of the structure of the piston ring of the present invention.

[0019] In the figure: 1. balancing cylinder; 2. piston rod; 3. piston ring; 4. rodless cavity air hole; 5. rodless cavity groove; 6. connecting seat; 7. movable connecting rod; 8. rod cavity groove; 9. rod cavity air hole. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] Example 1

[0022] like Figures 1 to 3 As shown, a specific embodiment of a frictionless pneumatic balancing mechanism for precision measurement described in the present invention comprises: a balancing cylinder 1, a piston ring 3 and a piston rod 2. The piston ring 3 is installed inside the balancing cylinder 1, and the piston rod 2 is arranged on the piston ring 3. A micrometer-level static pressure gap is arranged between the outer surface of the piston ring 3 and the inner wall of the balancing cylinder 1. The piston ring 3 divides the interior of the balancing cylinder 1 into a rodless cavity on the left and a rod cavity on the right. A rodless cavity air hole 4 is arranged on the left side of the piston ring 3, which is connected to the rodless cavity groove 5; a rod cavity air hole 9 is arranged on the right side, which is connected to the rod cavity groove 8. Both the rodless cavity groove 5 and the rod cavity groove 8 are annular grooves, which are opened around the outer surface of the piston ring 3.

[0023] Preferably, the rodless cavity air hole 4 and the rod cavity air hole 9 are set in two, and are symmetrically distributed on the upper and lower sides or the front and rear sides of the piston ring 3. A flexible connection mechanism is provided at the connection between the piston ring 3 and the piston rod 2, including a connecting seat 6 and a movable connecting rod 7. The movable connecting rod 7 is installed on the connecting seat 6 through a spherical head, and the other end is connected to the piston rod 2. In addition, a flexible connection mechanism can also be installed at the end of the protruding end of the piston rod 2.

[0024] Working principle of the present invention: The working principle of the frictionless pneumatic balancing mechanism of the present invention is based on the principle of static pressure air flotation. When the rod cavity is inflated, the gas enters the annular groove of the piston ring 3 through the rod cavity air hole 9 to form an air flotation annular surface. This air flotation annular surface separates the piston ring 3 from the cylinder wall, thereby eliminating direct contact and friction between them. At the same time, due to the existence of the static pressure gap, the gas can form a stable static pressure layer between the piston ring 3 and the cylinder wall, further improving the stability and accuracy of the mechanism.

[0025] When the piston rod 2 moves to the left or right, the piston ring 3 will move with it. Due to the existence of the air-floating annular surface, the friction between the piston ring 3 and the cylinder wall is eliminated, thereby achieving frictionless movement. In addition, due to the design of the air hole and the annular groove, the gas can continuously enter and discharge during the movement of the piston ring 3, thereby maintaining the stability and continuity of the air-floating annular surface. This design allows the piston to move repeatedly, reciprocate, quickly, and even creep in the cylinder without generating friction or wear, thereby improving the accuracy and stability of the measurement;

[0026] The connection between the piston ring and the piston rod is a flexible connection, and the spherical head of the movable connecting rod 7 is movably connected with the connecting seat 6, which reduces the error caused by deformation of the pull rod or slight changes in the pulling angle during operation.

[0027] The components in this article are all universal standard parts or components known to those skilled in the art. Their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods, so they will not be described in detail here.

[0028] Although the specific embodiments of the present invention are described in detail above, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in this field without departing from the purpose of the present invention, and modifications or deformations without creative labor are still within the protection scope of the present invention.

Claims

1. A frictionless pneumatic balancing mechanism for precision measurement, comprising: A balancing cylinder (1) is characterized in that: a piston ring (3) is installed inside the balancing cylinder (1), a piston rod (2) is installed on the piston ring (3), a micrometer-level static pressure gap is provided between the outer surface of the piston ring (3) and the inner wall of the balancing cylinder (1), the piston ring (3) divides the interior of the balancing cylinder (1) into a rodless chamber on the left and a rod chamber on the right, a rodless chamber air hole (4) is provided on the left side of the piston ring (3), and the rodless chamber air hole (4) is connected to the rodless chamber groove (5); a rod chamber air hole (9) is provided on the right side of the piston ring (3), and the rod chamber air hole (9) is connected to the rod chamber groove (8), and the rodless chamber groove (5) and the rod chamber groove (8) are provided around the outer surface of the piston ring (3).

2. A frictionless pneumatic balancing mechanism for precision measurement according to claim 1, characterized in that: The rod cavity groove (8) and the rodless cavity groove (5) are both annular grooves, and the groove openings are arranged corresponding to the inner wall of the balancing cylinder (1).

3. A frictionless pneumatic balancing mechanism for precision measurement according to claim 1, characterized in that: The rodless cavity air holes (4) are arranged in two numbers and are symmetrically arranged on the upper and lower sides of the piston ring (3).

4. A frictionless pneumatic balancing mechanism for precision measurement according to claim 1, characterized in that: The rod chamber air holes (9) are arranged in two numbers and are symmetrically arranged on the front and rear sides of the piston ring (3).

5. A frictionless pneumatic balancing mechanism for precision measurement according to claim 1, characterized in that: The rod cavity groove (8) is arranged on the left side of the rodless cavity groove (5).

6. A frictionless pneumatic balancing mechanism for precision measurement according to claim 1, characterized in that: A flexible connection mechanism is provided at the connection between the piston ring (3) and the piston rod (2).

7. A frictionless pneumatic balancing mechanism for precision measurement according to claim 6, characterized in that: The flexible connection mechanism comprises a connection seat (6) and a movable connection rod (7); the connection seat (6) is fixedly mounted at the center position of the piston ring (3); the movable connection rod (7) is mounted on the connection seat (6) via a spherical head; the other end of the movable connection rod (7) is connected to the piston rod (2).

8. A frictionless pneumatic balancing mechanism for precision measurement according to claim 6, characterized in that: A flexible connection mechanism is installed at the end of the extended end of the piston rod (2).

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