A piston assembly centering measurement and adjustment device, detection and adjustment method

Abstract

The present invention relates to a piston assembly centering measurement and adjustment device, a detection and adjustment method, and the piston assembly centering measurement and adjustment device comprises: a limiting fixing part, two displacement rods arranged oppositely, a displacement driving unit and a contact detection unit; the limiting fixing part is used to fix and limit the piston assembly; there is a gap between the two displacement rods, the compression piston of the fixed piston assembly is located between the two displacement rods, and the assembly adjustable direction of the compression piston is the same as the axial direction of the two displacement rods; the two displacement rods have the same initial distance from the piston assembly; the displacement driving unit is connected to the two displacement rods and controls the displacement of the displacement rods; the displacement rod can approach or move away from the compression piston under the control of the displacement driving unit, and can contact or push the compression piston; the contact detection unit is used to detect whether the displacement rod is in contact with the compression piston. The operation is simple and has good measurement and adjustment accuracy.

Description

Technical Field

[0001] The invention relates to the field of piston assemblies, and in particular to a piston assembly centering measuring and adjusting device, and a detection and adjusting method. Background Art

[0002] Stirling refrigerator is a low-temperature refrigerator that works in a reverse Stirling cycle. The Stirling cycle consists of two isothermal processes and two isochoric processes, forming a high-temperature high-pressure source and a low-temperature low-pressure source; the compression piston component is located in the sealed chamber of the rotary integrated Stirling refrigerator and is the main component that forms the high-pressure source. The compression piston component is one of the key structures of the rotary integrated Stirling refrigerator. In recent years, domestic and foreign scholars have conducted a lot of research on the mechanical simulation, experimental analysis and process assembly of this type of refrigerator structure. Because the clearance between the compression piston and the external cylinder sleeve is micron-level; when the compression connecting rod in the compression piston component is eccentrically assembled, the assembly positions of the two ends of the compression connecting rod will be eccentric, and the elastic force of the compression spring after assembly will be inconsistent with the direction of movement, so that the compression piston and the external contact surface form a large force, contact wear occurs, and the service life of the refrigerator is reduced. The existing technology does not effectively solve the problem of high-precision centering of the compression component, and it is easy to have problems such as inappropriate centering of the compression component and failure to meet the process assembly requirements, resulting in the Stirling refrigerator being stuck. Summary of the invention

[0003] The purpose of the present invention is to provide a piston assembly centering measurement and adjustment device, a detection and adjustment method, so as to solve the problem that the piston assembly centering is not suitable and cannot meet the process assembly requirements.

[0004] The piston assembly centering measuring and adjusting device of the present invention comprises: a limit fixing part, two displacement rods arranged opposite to each other, a displacement driving unit and a contact detection unit;

[0005] The limiting fixing part is used to fix and limit the piston assembly;

[0006] There is a gap between the two displacement rods, the compression piston of the fixed piston assembly is located between the two displacement rods, and the assembly adjustable direction of the compression piston is the same as the axial direction of the two displacement rods; the initial distances between the two displacement rods and the piston assembly are the same;

[0007] The displacement driving unit is connected to the two displacement rods and controls the displacement amount of the displacement rods, so that each displacement rod can move along its axial direction according to the set displacement amount; the displacement rod can approach or move away from the compression piston under the control of the displacement driving unit, and can contact or push the compression piston;

[0008] The contact detection unit is used to detect whether the displacement rod is in contact with the compression piston.

[0009] Optionally, the limiting fixing portion includes a first sub-limiting portion and a second sub-limiting portion;

[0010] The first sub-limiting portion is used to fix and limit the compression connecting rod of the piston assembly;

[0011] The second sub-limiting portion is located in the area between the two displacement rods, and limits the compression piston of the piston assembly.

[0012] Optionally, the first sub-limiting portion includes a fixing plate and a fixing member;

[0013] The fixing plate has a fixing plane perpendicular to the axial direction of the displacement rod;

[0014] The fixing plane of the compression connecting rod of the piston assembly by the fixing member is on the fixing plane.

[0015] Optionally, the fixing plate further has a displacement rod fixing structure, and the displacement rod fixing structure fixes the non-axial positions of the two displacement rods.

[0016] Optionally, the two displacement rods include screw displacement rods, and the displacement driving unit rotates the screw displacement rods to control the displacement of the screw displacement rods.

[0017] Optionally, the displacement accuracy of the two displacement rods is in micron level.

[0018] Optionally, the two displacement rods further include a transition component; the transition component is disposed at one end of the screw displacement rod away from the compression piston and is connected to the displacement drive unit.

[0019] Optionally, the contact detection unit includes an image acquisition unit, which is aligned with the two displacement rods and the area therebetween to acquire images of the displacement rods and the compression piston to determine whether the displacement rods are in contact with the compression piston.

[0020] On the other hand, the present invention also provides a method for detecting the centering degree of a piston assembly, comprising:

[0021] The piston assembly to be tested is fixed on the above-mentioned piston assembly centering measuring and adjusting device, the compression piston of the piston assembly is located between the two displacement rods, and the assembly adjustable direction of the compression piston is the same as the axial direction of the two displacement rods;

[0022] respectively controlling the displacement rods to move from an initial position toward the compression piston until they contact the compression piston;

[0023] The difference in displacement of the displacement rod is recorded to obtain the centering detection result of the piston assembly.

[0024] On the other hand, the present invention also provides a method for adjusting the centering of a piston assembly, comprising:

[0025] Fix the piston assembly on the piston assembly centering measuring and adjusting device, wherein the compression piston of the piston assembly is located between the two displacement rods, and the assembly adjustable direction of the compression piston is the same as the axial direction of the two displacement rods;

[0026] Controlling the displacement rod to move from an initial position toward the compression piston until it contacts the compression piston;

[0027] The displacement rod is continuously controlled to move so as to push the compression piston to move along its assembly adjustable direction so as to adjust the centering degree of the piston assembly.

[0028] The piston assembly centering measurement and adjustment device of the present invention measures the centering of the piston assembly by fixing the piston assembly and utilizing the displacement of the displacement rod when it is in contact with the piston assembly. In addition, the limiting fixing portion can make the assembly adjustable direction of the compression piston the same as the axial direction of the two displacement rods. By utilizing the displacement rod to push the compression piston, accurate centering adjustment can be directly achieved. The piston assembly centering measurement and adjustment device of the present invention integrates the functions of centering test and adjustment, is easy to operate, and has good measurement accuracy. Adjustments can be made immediately after the test is completed, thereby improving production efficiency. By continuously performing centering test and adjustment on the same device without repeated disassembly and assembly, errors between different test equipment and adjustment equipment and errors caused by repeated disassembly and assembly can also be avoided, further ensuring the accuracy of adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a structural schematic diagram of the piston assembly of this embodiment;

[0030] Figure 2 is a schematic diagram of the position limiting fixing portion and the displacement rod of this embodiment;

[0031] Figure 3 It is a partial schematic diagram of the limiting fixing part of this embodiment;

[0032] Figure 4 This is a schematic diagram of the structure of the piston assembly centering measurement and adjustment device of this embodiment;

[0033] Figure 5 Schematic diagram of the basic process of the piston assembly centering detection method of this embodiment;

[0034] Figure 6It is a basic flow chart of the method for adjusting the centering degree of the piston assembly of this embodiment;

[0035] Description of reference numerals:

[0036] 10-piston assembly; 11-compression connecting rod; 12-hollow pin; 13-compression spring; 14-compression piston; 15-compression pin; 21-limiting fixing part; 211-first sub-limiting part; 2111-fixing plate; 2112-fixing piece; 2113-displacement rod fixing structure; 212-second sub-limiting part; 22-displacement rod; 221-screw displacement rod; 222-adapting component; 23-displacement drive unit; 24-image acquisition unit; 25-host; 26-screen. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described 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, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0038] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0039] Embodiment 1:

[0040] This embodiment provides a piston assembly centering measurement and adjustment device. In this embodiment, the piston assembly 10 to be measured can be as follows: Figure 1The structure includes a compression connecting rod 11, a hollow pin 12, a compression spring 13, a compression piston 14 and a compression pin 15. Among them, the compression pin 15 is used to connect other structures with the compression piston 14, and when the compression connecting rod 11 in the compression piston 14 component is eccentrically assembled, it will cause the assembly positions at both ends of the compression connecting rod 11 to be eccentric. The centering degree of the piston assembly 10 is its degree of eccentricity. When the centering degree is 0, the assembly of the compression connecting rod 11 is completely accurate. Of course, the piston assembly 10 compatible with the piston assembly centering measurement and adjustment device of this embodiment is not limited to the above example, that is, the present invention does not limit the structure of the piston assembly 10. On the basis of understanding the inventive concept of the present invention, it can be extended to other piston assemblies 10 with similar structural features.

[0041] See also Figures 2 to 4 The piston assembly centering measurement and adjustment device of this embodiment includes: a limit fixing portion 21, two displacement rods 22 arranged opposite to each other, a displacement driving unit 23 and a contact detection unit.

[0042] The position limiting fixing portion 21 is a structure for fixing and limiting the piston assembly 10 , and it can fix the position and posture of the piston assembly 10 so that it can accurately complete the test or adjustment.

[0043] There is a gap between the two displacement rods 22, and the compression piston 14 of the fixed piston assembly 10 is located between the two displacement rods 22, and the assembly adjustable direction of the compression piston 14 is the same as the axial direction of the two displacement rods 22. The assembly adjustable direction of the compression piston 14 is the direction in which the centering degree can be adjusted by applying an external force to this direction. Figure 1 In the example, the compression pin 15 is in the axial direction.

[0044] In order to accurately calculate the displacement of the displacement rod 22, the initial distances between the two displacement rods 22 and the piston assembly 10 are the same. It should be noted that the initial distance here refers to the ideal state (i.e., when the centering degree is 0). In other words, if the centering degree is 0, the initial positions of the two displacement rods 22 are completely symmetrical with respect to the piston assembly 10. It can be understood that the initial position of the displacement rod 22 is a zero point position set based on this.

[0045] The displacement driving unit 23 is connected to the two displacement rods 22 and controls the displacement of the displacement rods 22 so that each displacement rod 22 can move along its axial direction according to the set displacement. The displacement rod 22 can approach or move away from the compression piston 14 under the control of the displacement driving unit 23, and can contact or push the compression piston 14.

[0046] When the displacement driving unit 23 drives the displacement rod 22 to contact the compression piston 14, the distance between the compression piston 14 and the initial position of the displacement rod 22 can be obtained based on the displacement of the displacement rod 22. When the centering degree is not 0, the displacements of the displacement rods 22 on both sides are different, and the centering degree of the piston assembly 10 at this time can be determined based on the difference in the displacements of the displacement rods 22 on both sides.

[0047] By pushing the compression piston 14 through the displacement rod 22 , the centering degree of the compression piston 14 can be adjusted.

[0048] The contact detection unit is used to detect whether the displacement rod 22 is in contact with the compression piston 14 .

[0049] In some embodiments, the position-limiting fixing portion 21 includes a first sub-position-limiting portion 211 and a second sub-position-limiting portion 212. The first sub-position-limiting portion 211 is used to fix and limit the compression connecting rod 11 of the piston assembly 10; the second sub-position-limiting portion 212 is located in the area between the two displacement rods 22, and limits the compression piston 14 of the piston assembly 10. The first sub-position-limiting portion 211 and the second sub-position-limiting portion 212 can fix the overall position and posture of the piston assembly 10 from two directions, and determine the accurate position of the compression piston 14, so that the compression piston 14 is in a state that can be accurately adjusted by the displacement rod 22, with good detection and adjustment accuracy.

[0050] In some embodiments, the first sub-limiting portion 211 includes a fixing plate 2111 and a fixing member 2112. The fixing plate 2111 has a fixing plane perpendicular to the axial direction of the displacement rod 22. The fixing member 2112 fixes the compression connecting rod 11 of the piston assembly 10 on the fixing plane.

[0051] For example Figure 3 As shown, the fixing plane may have a screw hole, and the fixing member 2112 may be a fastening screw, which passes through the hollow pin 12 of the piston assembly 10 and is connected to the screw hole on the fixing plane to stably fix the piston assembly 10. At the same time, the orientation of the hollow pin 12 of the piston assembly 10 is utilized to make the axial directions of the two displacement rods 22 in the adjustable direction be the same.

[0052] In some embodiments, the fixing plate 2111 further has a displacement rod fixing structure 2113, and the displacement rod fixing structure 2113 fixes the non-axial position of the two displacement rods 22. By providing the displacement rod fixing structure 2113 on the fixing plate 2111, the displacement rod 22 and the piston assembly 10 are both fixed in position based on the structure of the fixing plate 2111, which can ensure the relative position of the two is accurate, making the detection and adjustment results more accurate.

[0053] In some embodiments, the two displacement rods 22 include a screw displacement rod 221, and the displacement driving unit 23 rotates the screw displacement rod 221 to control the displacement of the screw displacement rod 221. The screw displacement rod 221 achieves displacement by rotating its driving rod portion, and the displacement accuracy is high and the drive control is easy.

[0054] In some embodiments, the displacement accuracy of the two displacement rods 22 is in the micron level, which can meet the requirement of the matching clearance between the compression piston 14 and the external cylinder sleeve.

[0055] In some embodiments, the two displacement rods 22 further include a transfer component 222; the transfer component 222 is disposed at one end of the screw displacement rod 221 away from the compression piston 14, and is connected to the displacement drive unit 23. The displacement drive unit 23 connects and drives the displacement rod 22 through the transfer component 222, and the transfer component 222 can make various displacement drive units 23 compatible with the displacement rod 22, so that the piston assembly has wider adaptability and better scalability to the intermediate measurement and adjustment device.

[0056] In some embodiments, the contact detection unit includes an image acquisition unit 24, which is aimed at the two displacement rods 22 and the area therebetween to obtain images of the displacement rods 22 and the compression piston 14 to determine whether the displacement rods 22 are in contact with the compression piston 14.

[0057] The image acquisition unit 24 includes but is not limited to a CCD (charge coupled device) camera or other cameras. Figure 4 As shown, the image acquisition unit 24 can be connected to the host 25, and the acquired image can be displayed through the screen 26 for the technician to view. The host 25 can be a controller such as a computer. In some examples, the host 25 can also realize displacement drive control, that is, it also controls the displacement drive unit 23.

[0058] In other embodiments, it is also possible to determine whether the displacement rod 22 is in contact with the compression piston 14 by providing a sensor at the front end of the displacement rod 22. Available sensors include but are not limited to distance sensors, pressure sensors, etc. The contact detection unit may also include multiple devices that can detect whether the displacement rod 22 is in contact with the compression piston 14, so as to achieve more accurate judgment.

[0059] The piston assembly centering measurement and adjustment device of the present embodiment measures the centering of the piston assembly 10 by fixing the piston assembly 10 and using the displacement of the displacement rod 22 when it is displaced to the piston assembly 10 in contact. In addition, the limit fixing portion 21 can make the assembly adjustable direction of the compression piston 14 the same as the axial direction of the two displacement rods 22. By using the displacement rod 22 to push the compression piston 14, accurate centering adjustment can be directly achieved. The piston assembly centering measurement and adjustment device of the present embodiment integrates the functions of centering test and adjustment, is easy to operate, and has good measurement accuracy. Adjustments can be made immediately after the test is completed, which also improves production efficiency. By continuously performing centering test and adjustment on the same device without repeated disassembly and assembly, errors between different test equipment and adjustment equipment and errors caused by repeated disassembly and assembly can also be avoided, further ensuring the accuracy of adjustment.

[0060] This embodiment also provides a method for detecting the centering degree of a piston assembly. Figure 5 As shown, it includes but is not limited to the steps of:

[0061] S101, fixing the piston assembly to be tested on the piston assembly centering measuring and adjusting device;

[0062] The piston assembly centering measuring and adjusting device is the piston assembly centering measuring and adjusting device mentioned above in this embodiment. After the piston assembly 10 is fixed, the compression piston 14 of the piston assembly 10 will be located between the two displacement rods 22, and the assembly adjustable direction of the compression piston 14 is the same as the axial direction of the two displacement rods 22.

[0063] S102, respectively controlling the displacement rods to move from the initial position toward the compression piston until they contact the compression piston;

[0064] The displacement rods 22 on both sides can move in sequence, and the displacement of the displacement rods 22 from the initial position to the time when they contact the compression piston 14 is measured. Of course, the displacement rods 22 on both sides can also start to move at the same time, and the present embodiment does not limit the action sequence of the two.

[0065] S103, recording the difference in displacement of the displacement rod to obtain a centering test result of the piston assembly;

[0066] The difference in displacement of the displacement rods 22 on both sides indicates the offset distance of the compression piston 14 of the piston assembly 10, which is the value of the centering degree. Of course, in this process, the image acquisition unit 24 and other parts can be used to acquire images, and the acquired images can be displayed on the screen 26 for image observation at any time, so that the technicians can grasp the test status.

[0067] The above method utilizes the aforementioned piston assembly centering measurement and adjustment device to detect the centering of the piston assembly 10 , and the detection process is simple and highly accurate.

[0068] This embodiment also provides a method for adjusting the centering of a piston assembly, such as Figure 6 As shown, it includes but is not limited to the steps of:

[0069] S201, fixing the piston assembly on the piston assembly centering measurement and adjustment device;

[0070] The piston assembly centering measuring and adjusting device is the piston assembly centering measuring and adjusting device mentioned above in this embodiment. After the piston assembly 10 is fixed, the compression piston 14 of the piston assembly 10 will be located between the two displacement rods 22, and the assembly adjustable direction of the compression piston 14 is the same as the axial direction of the two displacement rods 22.

[0071] S202, controlling the displacement rod to move from the initial position toward the compression piston until it contacts the compression piston;

[0072] S203, continue to control the displacement rod to move, so as to push the compression piston to move along its assembly adjustable direction to adjust the centering degree of the piston assembly;

[0073] In actual control, the above steps S202 and S203 can be divided into two stages and executed separately; or the displacement amount of the given displacement rod 22 can be controlled once so that the displacement rod 22 moves directly into position, completing these two processes continuously.

[0074] In some implementations, the adjustment of the centering degree can be completed with only one side of the displacement rod 22. In some implementations, the displacement rods 22 on both sides can clamp the compression piston 14 and move synchronously, so that the position of the compression piston 14 is always accurately limited, and the adjustment of the centering degree can also be accurately completed.

[0075] The above method uses the piston assembly centering measurement and adjustment device to adjust the centering of the piston assembly 10, and the adjustment process is simple and accurate. After the piston assembly centering detection method is completed, the adjustment can be performed directly without repeated fixed assembly process, thereby improving the overall production efficiency.

[0076] In addition, although exemplary embodiments have been described herein, the scope includes any and all embodiments based on the present disclosure that are equivalent, modified, omitted, combined (e.g., various embodiments intersecting), adapted or changed. It is not limited to the examples described in this specification or during the implementation of this application, and its examples will be interpreted as non-exclusive.

[0077] The above description is intended to be illustrative rather than restrictive. For example, the above examples (or one or more of them) can be used in combination with each other. For example, those of ordinary skill in the art may use other embodiments when reading the above description.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the embodiments of the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A piston assembly centering measurement and adjustment device, characterized in that: include: A limit fixing part, two displacement rods arranged opposite to each other, a displacement driving unit and a contact detection unit; The limiting fixing part is used to fix and limit the piston assembly; There is a gap between the two displacement rods, the compression piston of the fixed piston assembly is located between the two displacement rods, and the assembly adjustable direction of the compression piston is the same as the axial direction of the two displacement rods; the initial distances between the two displacement rods and the piston assembly are the same; The displacement driving unit is connected to the two displacement rods and controls the displacement amount of the displacement rods, so that each displacement rod can move along its axial direction according to the set displacement amount; the displacement rod can approach or move away from the compression piston under the control of the displacement driving unit, and can contact or push the compression piston; The contact detection unit is used to detect whether the displacement rod is in contact with the compression piston.

2. The piston assembly centering measurement and adjustment device according to claim 1, characterized in that: The limiting fixing portion includes a first sub-limiting portion and a second sub-limiting portion; The first sub-limiting portion is used to fix and limit the compression connecting rod of the piston assembly; The second sub-limiting portion is located in the area between the two displacement rods, and limits the compression piston of the piston assembly.

3. The piston assembly centering measurement and adjustment device according to claim 2, characterized in that: The first sub-limiting portion includes a fixing plate and a fixing member; The fixing plate has a fixing plane perpendicular to the axial direction of the displacement rod; The fixing plane of the compression connecting rod of the piston assembly by the fixing member is on the fixing plane.

4. The piston assembly centering measurement and adjustment device according to claim 3, characterized in that: The fixing plate further has a displacement rod fixing structure, and the displacement rod fixing structure fixes the non-axial positions of the two displacement rods.

5. The piston assembly centering measurement and adjustment device according to claim 1, characterized in that: The two displacement rods include a screw displacement rod, and the displacement driving unit rotates the screw displacement rod to control the displacement of the screw displacement rod.

6. The piston assembly centering measurement and adjustment device according to claim 5, characterized in that: The displacement accuracy of the two displacement rods is at micron level.

7. The piston assembly centering measurement and adjustment device according to claim 5, characterized in that: The two displacement rods further include a transition component; the transition component is arranged at one end of the screw displacement rod away from the compression piston and is connected to the displacement drive unit.

8. The piston assembly centering measurement and adjustment device according to any one of claims 1 to 7, characterized in that: The contact detection unit includes an image acquisition unit, which is aligned with the two displacement rods and the area therebetween to acquire images of the displacement rods and the compression piston to determine whether the displacement rods are in contact with the compression piston.

9. A method for detecting the centering degree of a piston assembly, characterized in that: include: The piston assembly to be tested is fixed on the piston assembly centering measuring and adjusting device according to any one of claims 1 to 8, wherein the compression piston of the piston assembly is located between the two displacement rods, and the assembly adjustable direction of the compression piston is the same as the axial direction of the two displacement rods; respectively controlling the displacement rods to move from an initial position toward the compression piston until they contact the compression piston; The difference in displacement of the displacement rod is recorded to obtain the centering detection result of the piston assembly.

10. A method for adjusting the centering degree of a piston assembly, characterized in that: include: The piston assembly is fixed to the piston assembly centering measuring and adjusting device according to any one of claims 1 to 8, wherein the compression piston of the piston assembly is located between the two displacement rods, and the assembly adjustable direction of the compression piston is the same as the axial direction of the two displacement rods; Controlling the displacement rod to move from an initial position toward the compression piston until it contacts the compression piston; The displacement rod is continuously controlled to move so as to push the compression piston to move along its assembly adjustable direction so as to adjust the centering degree of the piston assembly.

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