Friction-free pneumatic balance mechanism for precision measurement

Abstract

The utility model 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 utility model 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 accuracy and stability during the measurement process by providing stable air pressure support. Traditional pneumatic balancing mechanisms usually use the cooperation of piston and cylinder 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 numerous drawbacks. First, friction between the sealing element, the piston, and the cylinder body generates significant friction, which not only affects measurement accuracy but also accelerates wear of the sealing element, shortening its service life. Second, the friction coefficient of the piston in different batches of balanced cylinders varies. Even within the same cylinder, the friction coefficient can change after extended use, further impacting measurement accuracy. Furthermore, traditional sealing elements are prone to aging, and after a period of use, a black, worn residue forms on the piston rod, polluting the working environment and potentially negatively impacting 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. Utility Model Content

[0005] In order to overcome the shortcomings of traditional pneumatic balancing mechanisms, the utility model proposes a new frictionless pneumatic balancing mechanism design. This design realizes 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 micron-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 cavity on the left and a rod cavity on the right, a rodless cavity air hole is provided on the left side of the piston ring, and the rodless cavity air hole is connected to the rodless cavity groove; a rod cavity air hole is provided on the right side of the piston ring, and the rod cavity air hole is connected to the rod cavity groove, and the rodless cavity groove and the rod cavity 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 cavity 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 utility model has the following beneficial effects:

[0015] The frictionless pneumatic balancing mechanism of the utility model 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 the performance degradation caused by wear and aging of the 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, and 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 the deformation of the pull rod or the error caused by 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 utility model;

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

[0018] Figure 3 This is a cross-sectional view of the top view 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 utility model includes: a balancing cylinder 1, a piston ring 3 and a piston rod 2. A piston ring 3 is installed inside the balancing cylinder 1, and a piston rod 2 is provided on the piston ring 3. A micron-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 cavity on the left and a rod cavity on the right. A rodless cavity air hole 4 is provided 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 provided 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, there are two rodless cavity air holes 4 and rod cavity air holes 9, which are symmetrically distributed on the upper and lower sides or front and back 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 utility model: The working principle of the frictionless pneumatic balancing mechanism of the utility model is based on the principle of static pressure flotation. When the rod chamber is inflated, the gas enters the annular groove of the piston ring 3 through the rod chamber air hole 9, forming 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 precision of the mechanism.

[0025] When the piston rod 2 moves left or right, the piston ring 3 moves with it. Due to the presence of the air-floating annular surface, friction between the piston ring 3 and the cylinder wall is eliminated, achieving frictionless motion. Furthermore, due to the design of the air holes and annular grooves, gas can continuously enter and exit during the movement of the piston ring 3, maintaining the stability and continuity of the air-floating annular surface. This design allows the piston to move repeatedly, reciprocatingly, rapidly, and even creep within the cylinder without generating friction or wear, thereby improving measurement accuracy and stability.

[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 to the connecting seat 6, which reduces the error caused by deformation of the pull rod or slight changes in the tension 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. Within the scope of knowledge possessed by ordinary technicians in this field, various changes can be made without departing from the purpose of the present invention. Modifications or deformations that do not involve creative work are still within the scope of protection 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), and a micron-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 cavity on the left and a rod cavity on the right. A rodless cavity air hole (4) is provided on the left side of the piston ring (3), and the rodless cavity air hole (4) is connected to the rodless cavity groove (5); a rod cavity air hole (9) is provided on the right side of the piston ring (3), and the rod cavity air hole (9) is connected to the rod cavity groove (8). The rodless cavity groove (5) and the rod cavity 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. The frictionless pneumatic balancing mechanism for precision measurement according to claim 1, characterized in that: The rodless cavity air holes (4) are provided in two numbers and are symmetrically arranged on the upper and lower sides of the piston ring (3).

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

5. The 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. The 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), wherein the connection seat (6) is fixedly mounted at the center of the piston ring (3), the movable connection rod (7) is mounted on the connection seat (6) via a spherical head, and the other end of the movable connection rod (7) is connected to the piston rod (2).

8. The 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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