Pressure maintaining test tool for hydraulic tensioner

Abstract

The utility model discloses a pressure maintaining test tool for a hydraulic tensioner, at least two groups of pressure maintaining test tools are arranged on a detection platform, and each pressure maintaining test tool can be independently used to adapt to the production takt of an assembly line; the top end of the vertical frame is provided with a telescopic cylinder part for applying preset pressure to a jacking rod of the hydraulic tensioner; the pressure maintaining test tool further comprises a clamping tool, clamping blocks on the two sides of the clamping tool clamp and position the cylinder body of the hydraulic tensioner, and the ejector rod end of the hydraulic tensioner is aligned with the pressurizing rod. According to the pressure maintaining test tool for the hydraulic tensioner, the production takt of an assembly line is fitted by increasing the number of the pressure maintaining test tools, and the situation that the production speed is slowed down on the station is avoided. A displacement amplifying device is arranged in the tool, after the pressurizing rod exerts preset pressure, the positioning clamp is installed, if the ejector rod is compressed to move, the moving displacement of the ejector rod can be amplified according to the lever principle, and observation of an operator is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of tensioner manufacturing technology, specifically to a hydraulic tensioner pressure holding test fixture. Background Technology

[0002] A hydraulic tensioner is a device used to ensure proper tension in belt drive systems (such as timing belts, V-belts, or other types of drive belts in automobile engines) or chain drive systems. It uses hydraulic fluid to provide an adjustable force to maintain the correct tension of the belt or chain.

[0003] A hydraulic tensioner typically consists of a piston and a spring. When hydraulic oil is pressurized and enters the tensioner's chamber, it pushes the piston outward, thus applying pressure to the belt or chain. The spring provides a restoring force, allowing the piston to return to its original position when the hydraulic oil pressure decreases.

[0004] In the production of hydraulic tensioners, the pressure-holding test of the hydraulic cylinder is particularly important, as it affects the product's performance. In continuous production lines, this test is more time-consuming than other assembly steps. The pressure-holding test requires applying pressure to the push rod of the hydraulic cylinder and maintaining it for a certain period to determine if the pressure-holding effect is acceptable. Therefore, compared to other assembly stations on the production line, the pressure-holding test is relatively time-consuming and can easily slow down the production cycle. Furthermore, in existing technologies, the pressure-holding effect of hydraulic tensioners is usually judged by visually observing whether the push rod is compressed and whether there is external leakage in the cylinder. Due to the fast production pace, small amounts of compression of the push rod during the test are not easily detected by the naked eye, which can easily lead to defective products passing through the inspection.

[0005] In view of the above, it is necessary to propose a hydraulic tensioner pressure holding test fixture to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to overcome the defects in the existing technology and provide a hydraulic tensioner pressure holding test fixture.

[0007] To achieve the above objectives, the technical solution of this utility model is as follows: a hydraulic tensioner pressure holding test fixture, including a test platform, wherein at least two sets of pressure holding test fixtures are arranged on the test platform, and each pressure holding test fixture can be used independently to adapt to the production cycle of the assembly line;

[0008] The pressure holding test fixture includes a stand, the top of which is provided with a telescopic cylinder that applies a predetermined pressure to the top rod of the hydraulic tensioner. The pressure rod of the telescopic cylinder coincides with the axis of the hydraulic tensioner being positioned. The pressure holding test fixture also includes a clamping fixture, the clamping blocks on both sides of the clamping fixture clamping and positioning the cylinder of the hydraulic tensioner, and aligning the top rod end of the hydraulic tensioner with the pressure rod.

[0009] Furthermore, the pressure holding test fixture also includes a displacement amplification device, which includes a lever assembly, a fixed shaft, and a positioning clamp. The fixed shaft is vertically fixed on the vertical side plate of the stand. The lever assembly has a bushing in the middle. The lever assembly is rotatably mounted on the fixed shaft through the bushing. One end of the lever assembly is a toggle end and the other end is an indicator end. One end of the positioning clamp is a clamping jaw that clamps and fixes to the pressure rod, and the other end is a lever. The lever cooperates with the toggle end to rotate the lever assembly.

[0010] Furthermore, the length of the indicator end is greater than the length of the toggle end, the lever and the toggle end are arranged in a cross shape, and the lever is located above the toggle end and is fitted to it.

[0011] Furthermore, an indicator scale is distributed within the rotation range of the indicator end. The indicator scale is formed on the vertical side plate, and a stop bar is provided at the zero point of the indicator scale. The indicator end is located above the stop bar, and the stop bar limits the rotation of the lever assembly.

[0012] Furthermore, the indicator scale is also equipped with an alarm trigger lever. When the indicator end comes into contact with the alarm trigger lever, the warning light flashes and an alarm is triggered.

[0013] Furthermore, both the alarm trigger rod and the indicator end are conductors, and the system also includes an alarm circuit. The alarm trigger rod and the indicator end are electrically connected in the alarm circuit, serving as a switch to trigger the alarm.

[0014] Furthermore, the clamping fixture includes opposing clamping units, each clamping unit having a clamping block that moves relative to the other, the two clamping blocks clamping the positioning cylinder. Each clamping unit includes a positioning base, a clamping cylinder, and a guide rail. The positioning base has a guide rail, one end of the guide rail has a clamping cylinder, the clamping block is slidably disposed within the guide rail, and the piston rod of the clamping cylinder is connected to the clamping block.

[0015] Furthermore, the telescopic cylinder is a servo electric cylinder.

[0016] The advantages and beneficial effects of this utility model are as follows: This utility model provides a hydraulic tensioner pressure holding test fixture that matches the production rhythm of the assembly line by increasing the number of pressure holding test fixtures, avoiding slowing down the production speed at this workstation. When multiple pressure holding test fixtures are used independently, the throughput of testing can be increased. This fixture is equipped with a displacement amplification device. After the pressure rod applies a predetermined pressure, a positioning clamp is installed. If the push rod is compressed and moved, its displacement can be amplified through the lever principle, making it easy for the operator to observe. In addition, combined with the alarm circuit, an alarm can be triggered when the displacement of the push rod exceeds a certain value, making it very clear whether the quality of the hydraulic tensioner meets the requirements. Attached Figure Description

[0017] Figure 1 This is a perspective view of a hydraulic tensioner pressure holding test fixture according to this utility model;

[0018] Figure 2 This is a side view of a hydraulic tensioner pressure holding test fixture according to this utility model;

[0019] Figure 3 This is a top view of the displacement magnification device in this utility model;

[0020] In the diagram: 1. Detection platform; 2. Stand; 3. Telescopic cylinder; 4. Pressure rod; 5. Clamping fixture; 6. Clamping block; 7. Top rod; 8. Displacement amplification device; 9. Lever assembly; 10. Fixed shaft; 11. Positioning clamp; 12. Vertical side plate; 13. Bushing; 14. Actuating end; 15. Indicating end; 16. Lever; 17. Indicating scale; 18. Stop bar; 19. Alarm trigger rod; 20. Alarm circuit; 21. Clamping unit; 22. Positioning base; 23. Clamping cylinder body; 24. Guide rail. Detailed Implementation

[0021] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0022] A hydraulic tensioner pressure holding test fixture includes a testing platform on which at least two sets of pressure holding test fixtures are arranged. Each pressure holding test fixture can be used independently to adapt to the production cycle of an assembly line. Figure 1 As shown in the figure, this embodiment takes the setting of two sets of pressure holding test devices as an example. Two sets are arranged on the test platform. In actual use, additional devices can be added as needed.

[0023] The pressure-holding test fixture includes a stand, the top of which is equipped with a telescopic cylinder that applies a predetermined pressure to the top rod of the hydraulic tensioner. The stand serves as a mounting platform for the telescopic cylinder, allowing it to be positioned at a certain height above the testing platform, facilitating the placement of the tensioner under test below. In this embodiment, a servo electric cylinder is used for the telescopic cylinder, but pneumatic cylinders, hydraulic cylinders, etc., can also be used as alternatives. The principle is the same: the telescopic cylinder applies a predetermined pressure to the top rod of the tensioner to test its compressive strength. The pressure rod of the telescopic cylinder coincides with the axis of the positioned hydraulic tensioner. This coincidence avoids inaccurate monitoring caused by tensioner misalignment. The pressure-holding test fixture also includes a clamping fixture. The clamping blocks on both sides of the clamping fixture clamp and position the cylinder body of the hydraulic tensioner, aligning the top rod end of the hydraulic tensioner with the pressure rod.

[0024] Specifically, the clamping fixture includes opposing clamping units, each with a relatively movable clamping block. The two clamping blocks clamp a positioning cylinder. Each clamping unit includes a positioning base, a clamping cylinder, and a guide rail. The positioning base has a guide rail, one end of which has the clamping cylinder. The clamping blocks are slidably disposed within the guide rail, and the piston rod of the clamping cylinder is connected to the clamping block. Each pressure-holding test fixture has two sets of clamping units, which move symmetrically to ensure the tensioner can be centered and positioned as shown. Figure 1 The position shown indicates that the tensioner and the pressure rod are coaxial.

[0025] During testing, since the telescopic cylinder first presses against the push rod and then gradually increases the pressure to the predetermined level, the operator does not need to observe the amount of push rod retraction during the holding process. This embodiment includes a displacement amplification device to detect and amplify the displacement during the pressure application process of the pressure rod to the push rod, facilitating direct observation by the operator. Specifically, for example... Figure 2 , 3 As shown, the displacement amplification device includes a lever assembly, a fixed shaft, and a positioning clamp. The fixed shaft is vertically fixed on the vertical side plate of the stand. A bushing is provided in the middle of the lever assembly, which is rotatably mounted on the fixed shaft via the bushing. One end of the lever assembly is a deflecting end, and the other end is an indicating end. One end of the positioning clamp is a clamping jaw that holds and fixes the pressure rod, and the other end is a lever. The lever cooperates with the deflecting end to rotate the lever assembly. The lever assembly can rotate freely on the fixed shaft, and the length of the indicating end is greater than the length of the deflecting end. When there is a quality problem with the hydraulic cylinder of the tensioner during the pressure holding process, the push rod will be compressed into the cylinder under a predetermined pressure, thus forming a slight displacement. This displacement is converted into a lever that amplifies the lever assembly, allowing the other end of the lever assembly to amplify this displacement for easy observation by the operator. Figure 3As shown, the lever and the actuating end are arranged in a cross shape, and the lever is located above the actuating end and is attached to it; the cross shape arrangement facilitates the movement of the lever when it actuates the lever.

[0026] Furthermore, the indicator end has indicator graduations distributed within its rotation range. These graduations are formed on the vertical side plate, and a stop bar is located at the zero point of the indicator graduations. The indicator end is positioned above the stop bar, which limits the rotation of the lever assembly. Figure 2 As shown, without the positioning clamp, the lever assembly is supported and positioned at a certain position by the stop bar; and the indicator scale allows for precise observation of the amount of movement, thereby determining the leakage status of the tensioner cylinder.

[0027] The indicator scale is also equipped with an alarm trigger lever. When the indicator end comes into contact with the alarm trigger lever, the warning light flashes and an alarm is triggered. In actual use, the alarm trigger lever is set at a certain scale position. When the lever assembly rotates, it touches the alarm trigger lever, which can control the sound and light alarm to be triggered, thus more conveniently reminding the operator of product quality problems and avoiding errors in visual observation.

[0028] like Figure 3 As shown, specifically, both the alarm trigger rod and the indicator end are conductors, and an alarm circuit is also included. The alarm trigger rod and the indicator end are electrically connected in the alarm circuit, serving as a switch to trigger the alarm. By using the alarm trigger rod and the indicator end as a switch for the alarm circuit, an audible and visual alarm can be triggered once the two are touched, making it quite sensitive. As an improvement, the head of the indicator end can be made into a spring to prevent the alarm trigger rod from blocking the lever assembly and restricting its continued rotation.

[0029] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A hydraulic tensioner hold test fixture, characterized in that, The detection platform is provided with at least two groups of pressure maintaining test tools arranged thereon, and each pressure maintaining test tool can be independently used to adapt to the production rhythm of a flow line; The pressure maintaining test tool comprises a stand, a telescopic cylinder part provided at the top end of the stand and configured to apply a predetermined pressure to a top rod of a hydraulic tensioner, and a pressing rod of the telescopic cylinder part coincides with an axis of the positioned hydraulic tensioner; the pressure maintaining test tool further comprises a clamping tool, and clamping blocks on both sides of the clamping tool are configured to clamp and position a cylinder body of the hydraulic tensioner and align an end of the top rod of the hydraulic tensioner with the pressing rod.

2. The hydraulic tensioner hold test fixture of claim 1, wherein, The pressure maintaining test tool further comprises a displacement amplification device, the displacement amplification device comprises a lever assembly, a fixed shaft and a positioning clamp, the fixed shaft is vertically fixed on a vertical side plate of the stand, the lever assembly is provided on the fixed shaft through a shaft sleeve in the middle of the lever assembly, one end of the lever assembly is a driving end, and the other end is an indicating end, one end of the positioning clamp is a clamping opening and is clamped on the pressing rod, and the other end is a driving rod, the driving rod is matched with the driving end to drive the lever assembly to rotate.

3. The hydraulic tensioner hold test fixture of claim 2, wherein, The indicating end is longer than the driving end, the driving rod and the driving end are cross arranged, and the driving rod is located on the upper part of the driving end and is in close contact with the driving end.

4. The hydraulic tensioner hold test fixture of claim 2, wherein, An indicating scale is arranged in the rotation range of the indicating end, the indicating scale is formed on the vertical side plate, a stop rod is arranged at the zero position of the indicating scale, the indicating end is located on the upper side of the stop rod, and the stop rod limits the rotation of the lever assembly.

5. The hydraulic tensioner hold test fixture of claim 4, wherein, An alarm triggering rod is further arranged on the indicating scale, and the indicating end is in contact with the alarm triggering rod to make the warning light flash and alarm.

6. The hydraulic tensioner hold test fixture of claim 5, wherein, The indicating end and the alarm triggering rod are both conductors, and an alarm circuit is further arranged, the indicating end and the alarm triggering rod are both electrically connected to the alarm circuit to serve as switches for triggering the alarm.

7. The hydraulic tensioner hold test fixture of claim 1, wherein, The clamping tool comprises two clamping units arranged in opposition, the two clamping units are provided with clamping blocks that are relatively movable, and the two clamping blocks clamp and position the cylinder body, the clamping unit comprises a positioning base, a clamping cylinder body and a guide rail, the positioning base is provided with the guide rail, one end of the guide rail is provided with the clamping cylinder body, the clamping blocks are slidably arranged in the guide rail, and a piston rod of the clamping cylinder body is connected to the clamping blocks.

8. The hydraulic tensioner hold test fixture of claim 1, wherein, The telescopic cylinder part is a servo electric cylinder.

Images