A cylinder extension testing tool

Abstract

The utility model discloses a kind of oil cylinder extension quantity test tool, including pull line type displacement sensor, first hoop component, movable mechanism and second hoop component;Pull line type displacement sensor includes sensor body and lead wire;First hoop component is structured to be fixed between sensor body and cylinder barrel and unfixing;Second hoop component is structured to be fixed between movable mechanism and piston rod and unfixing;Lead wire is connected with movable mechanism, movable mechanism includes first moving component and second moving component, first moving component can be linearly moved along the radial direction of piston rod, for eliminating the error generated when testing that cylinder barrel and piston rod diameter are different;Second moving component can be swing function along the circumferential direction of piston rod, for eliminating the error generated when testing that cylinder barrel and piston rod relatively rotate.

Description

Technical Field

[0001] This utility model relates to a tooling for testing the extension amount of a hydraulic cylinder, belonging to the field of hydraulic cylinder measurement technology. Background Technology

[0002] The currently used wire-type displacement sensor consists of two parts: the sensor and the lead wire. The sensor and lead wire ends are respectively fixed to the cylinder barrel and piston rod of the suspension cylinder with wire. During dynamic testing, the cylinder barrel and piston rod will move in a vertical direction and will also undergo lateral coaxial offset due to rotation. The length of the displacement sensor's lead wire changes continuously with the cylinder's movement, thus allowing the computer to obtain the change in piston rod extension.

[0003] Because the leads of a wire-type displacement sensor must be perfectly parallel to the piston rod to obtain accurate data, the following problems may arise during the actual assembly of a wire-type displacement sensor: 1) Because the cylinder and piston rod have different diameters, the lead wire cannot be parallel to the piston rod during installation.

[0004] 2) Because the positions of both ends of the sensor need to be fixed, the lead wire will stretch in all directions during actual use as the cylinder and piston rod move relative to each other, affecting data accuracy. For example, when turning left while stationary, the actual extension of the piston rod does not change, but because the cylinder and piston rod rotate relative to each other, the length of the lead wire changes, resulting in a large error.

[0005] 3) The sensor is fixed with wire at both ends, which makes disassembly and assembly troublesome and lacks reliability.

[0006] Wire-type displacement sensors are mostly used on fixed frames and are primarily for unidirectional tension conditions, such as measuring the extension of the bucket cylinder in excavators. However, in the measurement of hydraulic cylinders for mine car suspensions, the dynamic changes are numerous, making it difficult to guarantee data accuracy. Summary of the Invention

[0007] This utility model provides a hydraulic cylinder extension testing fixture, which solves the problem of insufficient accuracy in testing the extension of hydraulic cylinders for mine car suspension. The main errors are caused by the relative rotation of the cylinder and piston rod and the initial error caused by the lead wire not being parallel to the piston rod.

[0008] This utility model is achieved according to the following technical solution: A fixture for testing the extension amount of a hydraulic cylinder includes: A draw-wire displacement sensor, comprising a sensor body and a lead wire; The first clamping component is configured to fix and release the sensor body and the cylinder. A movable mechanism and a second clamping component, the second clamping component being configured to fix and release the movable mechanism and the piston rod; the lead wire is connected to the movable mechanism, the movable mechanism comprising: The first moving part is capable of linear movement along the radial direction of the piston rod, which is used to eliminate the error caused by the difference in diameter between the cylinder and the piston rod during testing; The second moving part is capable of oscillating along the circumferential direction of the piston rod to eliminate errors caused by the relative rotation of the cylinder and piston rod during testing.

[0009] In some embodiments, the first moving component includes: The slide rail base includes a connecting part and a supporting part, wherein the connecting part is connected to the piston rod through the second clamping component; The slide rail has one end fixed to the support in the longitudinal direction, and the other end extends outward along the radial direction of the piston rod. The slider is engaged with the slide rail, forming a sliding pair between them; the first moving component is mounted on the slider and can follow the slider to move linearly on the slide rail.

[0010] In some embodiments, the second moving component includes: The lever has one end hinged to the top surface of the slider along its length, and the other end connected to the lead wire along its length. The pressure cap, fixed on the slider, limits the axial movement of the swing arm, so that the swing arm can only swing in the circumferential direction. The swing arm and the pressure cap can move linearly along the slide rail together with the slider.

[0011] In some embodiments, the rocker arm and the slider are hinged in the following manner: The top surface of the slider has a cylinder in the middle region at the end away from the piston rod. The rocker arm is fitted onto the cylinder, and a bearing is fixed between the circumferential surfaces of the cylinder and the rocker arm facing the circular hole.

[0012] In some embodiments, the connecting part of the slide rail base is provided with a connecting hole to facilitate the passage of the second clamping component, the top surface of the support part of the slide rail base is provided with a threaded hole, the slide rail is provided with a countersunk hole arranged coaxially with the threaded hole, and the screw cooperates with the countersunk hole and the threaded hole to fix the slide rail on the support part.

[0013] In some embodiments, the slide rail has a threaded hole at the end away from the piston rod, and a protrusion for restricting the axial movement of the slider to prevent it from disengaging from the slide rail is installed in the threaded hole.

[0014] In some embodiments, the sensor body is connected to the first clamping component via a sensor base. The sensor base has a connecting hole near the cylinder to facilitate the passage of the second clamping component. The sensor base has a threaded hole near the sensor body. The sensor body has a through hole arranged coaxially with the threaded hole. Screws cooperate with the through hole and the threaded hole to fix the sensor body to the sensor base.

[0015] In some embodiments, both the first clamping component and the second clamping component are ratchet tensioners that are easy to install and remove.

[0016] In some embodiments, a rigid telescopic sleeve is installed between the sensor body and the movable mechanism. The telescopic sleeve can change its length along with the piston rod as it extends and retracts. The lead wire is threaded through the telescopic sleeve so that the lead wire remains vertical during the extension and retraction of the piston rod.

[0017] The beneficial effects of this utility model are: 1. The structure of slider, slide rail and bearing is adopted. The back and forth movement of the slider eliminates the error caused by the difference in diameter of cylinder and piston rod during the test. The connecting part can swing left and right through the bearing to eliminate the error caused by the relative rotation of the oil cylinder. Compared with the existing technology, the test accuracy is improved.

[0018] 2. The metal telescopic sleeve connects both ends to ensure synchronized movement, solving the problems of motion delay and inconsistent vertical movement caused by loose lead wires in existing technologies. It also keeps the lead wire vertical throughout the piston rod's extension and retraction, allowing for precise measurement of the cylinder's extension amount.

[0019] 3. Ratchet tensioner solves the problems of difficult disassembly and assembly and low reliability caused by the use of wire for fixing in existing technology. Attached Figure Description

[0020] The accompanying drawings, as part of this utility model, are used to provide a further understanding of the present utility model. The illustrative embodiments and descriptions of the present utility model are used to explain the present utility model, but do not constitute an undue limitation of the present utility model. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0021] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of a hydraulic cylinder extension measurement fixture according to the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the overall structure of a hydraulic cylinder extension measurement fixture according to the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the structure of a hydraulic cylinder extension measurement fixture of the present invention after removing the ratchet tensioner; Figure 4 This is a schematic diagram of the overall structure of the active mechanism of this utility model; Figure 5 This is a schematic diagram of the movable mechanism of this utility model after removing the pressure cap; Figure 6 This is a schematic diagram showing the connection between the sensor base, telescopic sleeve, and movable mechanism of this utility model; Figure 7 This is a schematic diagram illustrating the application of a hydraulic cylinder extension measurement fixture according to this utility model. Figure 1 ; Figure 8 This is a schematic diagram illustrating the application of a hydraulic cylinder extension measurement fixture according to this utility model. Figure 2 .

[0022] The attached diagram is labeled as follows: 1. Ratchet tensioner, 2. Sensor base, 3. Displacement sensor, 4. Telescopic sleeve, 5. Swing rod, 6. Slide rail, 7. Slide rail base, 8. Ratchet tensioner, 9. Piston rod, 10. Cylinder, 11. Slider, 12. Pressure cap, 13. Bearing.

[0023] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0025] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] like Figure 1 , Figure 2 , Figure 7 , Figure 8 As shown, a hydraulic cylinder extension testing fixture includes a wire-type displacement sensor 3, a first clamping component (i.e., ratchet tensioner 1), a movable mechanism, and a second clamping component (i.e., ratchet tensioner 8). The wire-type displacement sensor 3 includes a sensor body and a lead wire. The first clamping component is configured to fix and release the sensor body and the cylinder 10. The second clamping component is configured to fix and release the movable mechanism and the piston rod 9. The lead wire is connected to the movable mechanism, which includes a first moving component and a second moving component. The first moving component can move linearly along the radial direction of the piston rod 9 to eliminate the error caused by the difference in diameter between the cylinder 10 and the piston rod 9 during the test. The second moving component can swing along the circumferential direction of the piston rod 9 to eliminate the error caused by the relative rotation of the cylinder 10 and the piston rod 9 during the test.

[0028] The specific structure of the first moving part described above will be further explained below.

[0029] like Figure 3 , Figure 4 , Figure 6 As shown, the first moving component includes a slide rail base 7, a slide rail 6, and a slider 11. The slide rail base 7 includes a connecting part and a supporting part. The connecting part is connected to the piston rod 9 through a second clamping component (i.e., a ratchet tensioner 8). One end of the slide rail 6 is fixed to the supporting part in the longitudinal direction, and the other end of the slide rail 6 extends outward along the radial direction of the piston rod 9. The slider 11 is engaged with the slide rail 6, and a sliding pair is formed between the two. The first moving component is mounted on the slider 11 and can move linearly along the slide rail 6 following the slider 11.

[0030] The specific structure of the second moving part described above will be further explained below.

[0031] like Figure 3 , Figure 4 , Figure 6As shown, the second moving part includes a swing arm 5 and a pressure cap 12. One end of the swing arm 5 is hinged to the top surface of the slider 11 in the longitudinal direction, and the other end in the longitudinal direction is connected to the lead wire. The pressure cap 12 is fixed on the slider 11 and axially limits the swing arm 5 so that the swing arm 5 can only swing in the circumferential direction. The swing arm 5 and the pressure cap 12 can move linearly on the slide rail 6 together with the slider 11.

[0032] Further options, such as Figure 5 As shown, the rocker arm 5 and the slider 11 are hinged in the following manner: a cylinder is provided on the top surface of the slider 11 in the middle region of the end away from the piston rod 9, the rocker arm 5 is fitted on the cylinder, and a bearing 13 is fixed between the cylinder and the circumferential surface of the circular hole of the rocker arm 5 facing each other.

[0033] As can be seen from the above, the error caused by the different diameters of the cylinder 10 and piston rod 9 during the test is eliminated by the forward and backward movement of the slider 11. The connecting part can swing left and right through the bearing 13 to eliminate the error caused by the relative rotation of the oil cylinder. Compared with the existing technology, the test accuracy is improved. The slider 11, slide rail 6 and bearing 13 are all standard parts, and the total cost does not exceed 10 yuan. It has the advantages of being economical and easy to use.

[0034] The following provides a further explanation of the specific connection method of the slide rail base mentioned above.

[0035] like Figure 1 , Figure 2 , Figure 4 , Figure 5 As shown, the connecting part of the slide rail base 7 is provided with a connecting hole to facilitate the passage of the second clamping component. The top surface of the support part of the slide rail base 7 is provided with a threaded hole. The slide rail 6 is provided with a countersunk hole arranged coaxially with the threaded hole. The screw cooperates with the countersunk hole and the threaded hole to fix the slide rail 6 on the support part.

[0036] In a further embodiment, the slide rail 6 has a threaded hole at the end away from the piston rod 9, which is used to restrict the axial movement of the slider 11 to prevent it from disengaging from the slide rail 6. The protrusion is installed in the threaded hole.

[0037] The following provides a further explanation of the specific connection method of the aforementioned sensor body.

[0038] like Figure 1 , Figure 2 , Figure 6 As shown, the sensor body is connected to the first clamping component (i.e., ratchet tensioner 1) through the sensor base 2. The sensor base 2 is provided with a connecting hole near the cylinder 10 to facilitate the passage of the second clamping component. The sensor base 2 is provided with a threaded hole near the sensor body. The sensor body is provided with a through hole arranged coaxially with the threaded hole. The screw cooperates with the through hole and the threaded hole to fix the sensor body on the sensor base 2.

[0039] Further options, such as Figure 1 , Figure 2 , Figure 7 , Figure 8 As shown, both the first clamping component and the second clamping component adopt ratchet tensioners 1 and 8 that are easy to disassemble and assemble, which solves the problem of difficult disassembly and assembly and low reliability caused by the use of iron wire for fixing in the existing technology.

[0040] Further options, such as Figure 1 , Figure 2 , Figure 3 , Figure 7 , Figure 8 As shown, a rigid telescopic sleeve 4 (similar to a fishing rod) is installed between the sensor body and the moving mechanism. The telescopic sleeve 4 can change its length along with the piston rod 9 as it extends and retracts. The lead wire is threaded through the telescopic sleeve 4 so that the lead wire always remains vertical during the extension and retraction of the piston rod 9.

[0041] As can be seen from the above, the telescopic sleeve 4 solves the problems of action delay and inconsistent up and down movements caused by the loose lead wire in the existing technology. It can also keep the lead wire in a vertical state during the extension and retraction of the piston 9, and accurately obtain the extension amount of the oil cylinder.

[0042] The following describes the installation process and working principle of the above-mentioned hydraulic cylinder extension test fixture.

[0043] Installation process: as follows Figure 1 , Figure 2 , Figure 7 , Figure 8 As shown, when testing the extension of the hydraulic cylinder, the sensor body is fixed on the sensor base 2 and installed on the cylinder 10 via the ratchet tensioner 1, and its position can be adjusted arbitrarily; the slide rail base 7 is installed on the piston rod 9 via the ratchet tensioner 8, and its position can be adjusted arbitrarily; the slide rail 6 is installed on the slide rail base 7, and the swing rod 5 is installed on the slide rail 6 via a bearing. The swing rod 5 swings left and right at the bearing 13 as the hydraulic cylinder rotates relative to it, and moves back and forth along the slide rail 6 to continuously adjust its position; the lead wire in the displacement sensor 3 is stretched and passed through the telescopic sleeve 5 and then fixed on the swing rod 5. The lead wire always remains vertical inside the telescopic sleeve 5, and the lead wire and the telescopic sleeve 5 can also be adjusted synchronously.

[0044] Working principle: such as Figure 1 , Figure 2 , Figure 7 , Figure 8As shown, the cylinder 10 is fixedly connected to the frame. The displacement sensor 3 and the telescopic sleeve 4, both connected to the cylinder 10, remain in their original positions. The lead wire end is fixedly positioned on the swing rod 5 directly below the telescopic sleeve 4. When turning in place, the extension of the piston rod 9 does not change, but the cylinder 10 and piston rod 9 rotate relative to each other, i.e., the piston rod 9 rotates left and right, causing the lead wire end to shift position. At this time, the swing rod 5 swings left and right around the bearing, or the slide rail 6 can be used for front and rear position adjustment to keep the lead wire end always directly below the telescopic sleeve 4. During dynamic running, the cylinder will continuously turn left and right, and the uneven road surface will also cause the extension of the piston rod 9 to change continuously. The telescopic sleeve 4 can change its length when the extension of the piston rod 9 changes, keeping the extension of the swing rod 5, lead wire, and piston rod 9 consistent, thereby obtaining accurate test data.

[0045] In summary, this utility model provides a tooling for testing the extension of a hydraulic cylinder, achieving the following functions and effects: 1. The structure adopts a slider, slide rail and bearing. The back and forth movement of the slide rail eliminates the error caused by the different diameters of the cylinder and piston rod during the test. The connecting part can swing left and right through the bearing to eliminate the error caused by the relative rotation of the oil cylinder. Compared with the existing technology, the test accuracy is improved. The slider, slide rail and bearing are all standard parts, and the total cost does not exceed 10 yuan. It has the advantages of being economical and easy to use.

[0046] 2. The metal telescopic sleeve connects both ends to ensure synchronized movement, solving the problems of motion delay and inconsistent vertical movement caused by loose lead wires in existing technologies. It also keeps the lead wire vertical throughout the piston rod's extension and retraction, allowing for precise measurement of the cylinder's extension amount.

[0047] 3. Ratchet tensioner solves the problems of difficult disassembly and assembly and low reliability caused by the use of wire for fixing in existing technology.

[0048] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0049] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features found in other embodiments but not others, combinations of features from different embodiments are also within the scope of protection of this invention and form different embodiments. For example, in the embodiments described above, those skilled in the art can use them in combination based on known technical solutions and the technical problems to be solved by this application.

[0050] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A fixture for testing the extension amount of a hydraulic cylinder, characterized in that, include: A draw-wire displacement sensor, comprising a sensor body and a lead wire; The first clamping component is configured to fix and release the sensor body and the cylinder. A movable mechanism and a second clamping component, the second clamping component being configured to fix and release the movable mechanism and the piston rod; the lead wire is connected to the movable mechanism, the movable mechanism comprising: The first moving part is capable of linear movement along the radial direction of the piston rod, which is used to eliminate the error caused by the difference in diameter between the cylinder and the piston rod during testing; The second moving part is capable of oscillating along the circumferential direction of the piston rod to eliminate errors caused by the relative rotation of the cylinder and piston rod during testing.

2. The hydraulic cylinder extension testing fixture according to claim 1, characterized in that, The first moving part includes: The slide rail base includes a connecting part and a supporting part, wherein the connecting part is connected to the piston rod through the second clamping component; The slide rail has one end fixed to the support in the longitudinal direction, and the other end extends outward along the radial direction of the piston rod. The slider is engaged with the slide rail, forming a sliding pair between them; the first moving component is mounted on the slider and can follow the slider to move linearly on the slide rail.

3. The hydraulic cylinder extension testing fixture according to claim 2, characterized in that, The second moving part includes: The lever has one end hinged to the top surface of the slider along its length, and the other end connected to the lead wire along its length. The pressure cap, fixed on the slider, axially limits the swing arm, so that the swing arm can only swing in the circumferential direction. The swing arm and the pressure cap can move linearly along the slide rail together with the slider.

4. The hydraulic cylinder extension testing fixture according to claim 3, characterized in that, The rocker arm and the slider are hinged in the following manner: The top surface of the slider has a cylinder in the middle region at the end away from the piston rod. The rocker arm is fitted onto the cylinder, and a bearing is fixed between the circumferential surfaces of the cylinder and the rocker arm facing the circular hole.

5. The hydraulic cylinder extension testing fixture according to claim 2, characterized in that: The connecting part of the slide rail base is provided with a connecting hole to facilitate the passage of the second clamping component. The top surface of the support part of the slide rail base is provided with a threaded hole. The slide rail is provided with a countersunk hole arranged coaxially with the threaded hole. The screw cooperates with the countersunk hole and the threaded hole to fix the slide rail on the support part.

6. The hydraulic cylinder extension testing fixture according to claim 2, characterized in that: The slide rail has a threaded hole at the end away from the piston rod, and a protrusion for restricting the axial movement of the slider to prevent it from disengaging from the slide rail is installed in the threaded hole.

7. The hydraulic cylinder extension testing fixture according to claim 1, characterized in that: The sensor body is connected to the first clamping component via a sensor base. The sensor base has a connecting hole near the cylinder to facilitate the passage of the second clamping component. The sensor base has a threaded hole near the sensor body. The sensor body has a through hole arranged coaxially with the threaded hole. The screw cooperates with the through hole and the threaded hole to fix the sensor body to the sensor base.

8. The hydraulic cylinder extension testing fixture according to claim 1, characterized in that: Both the first clamping component and the second clamping component are ratchet tensioners that are easy to assemble and disassemble.

9. The hydraulic cylinder extension testing fixture according to claim 1, characterized in that: A rigid telescopic sleeve is installed between the sensor body and the movable mechanism. The telescopic sleeve can change its length along with the piston rod as it extends and retracts. The lead wire is passed through the telescopic sleeve so that the lead wire always remains vertical during the extension and retraction of the piston rod.

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