A test tool for an oil cylinder
By designing a hydraulic cylinder testing fixture and utilizing a combination of guide rails and adjusting brackets, the relative displacement between the piston rod and the cylinder body is realized, solving the problem of unstable simulation of piston rod and cylinder body displacement in hydraulic cylinder testing and improving testing accuracy and efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- PINGHU HIGHGATE AUTOMATION CO LTD
- Filing Date
- 2025-10-27
- Publication Date
- 2026-06-26
AI Technical Summary
In existing technologies, when testing the performance of a one-way throttle valve, it is difficult to simulate the relative displacement between the piston rod and the cylinder body, resulting in unstable test conditions and affecting test accuracy.
A hydraulic cylinder testing fixture was designed, including a base, first and second guide rails, an adjustment frame, and a drive assembly. By sliding and fixing the adjustment frame, the relative displacement between the piston rod and the cylinder body is achieved, simulating the actual working state of the hydraulic cylinder.
This achieved stable installation and precise displacement of the hydraulic cylinder during the testing process, reducing testing costs and improving the accuracy and efficiency of one-way throttle valve testing.
Smart Images
Figure CN224414026U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of mechanical technology, specifically a hydraulic cylinder testing fixture. Background Technology
[0002] After the hydraulic cylinder is manufactured, the performance of its internal one-way throttle valve needs to be tested. First, the piston rod of the hydraulic cylinder is made to produce a relative displacement with the cylinder body. After the relative displacement speed reaches the preset requirement and the one-way throttle valve reaches the preset flow rate, it is then confirmed whether the throttle valve is working properly. Summary of the Invention
[0003] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a hydraulic cylinder testing fixture.
[0004] The objective of this utility model can be achieved through the following technical solutions:
[0005] A hydraulic cylinder testing fixture, comprising:
[0006] A base on which a first guide rail and a second guide rail are mounted;
[0007] A first adjusting frame is slidably mounted on a first guide rail, and the first adjusting frame can slide relative to the first guide rail or be fixed on the first guide rail; a first positioning device is installed on the first adjusting frame, and the first positioning device is used to fix the piston rod of the oil cylinder;
[0008] The second adjusting frame is slidably mounted on the second guide rail. The first adjusting frame and the second adjusting frame move in the same direction. The second adjusting frame is equipped with a second positioning device, which is used to fix the cylinder body tail end of the oil cylinder.
[0009] A drive assembly, which is connected to the second adjustment frame, is used to drive the second adjustment frame to move.
[0010] In the above-mentioned hydraulic cylinder testing fixture, a strip-shaped guide hole is provided on the first guide rail, and a number of fastening bolts are threadedly connected to the first adjusting frame. The fastening bolts pass through the strip-shaped guide hole and are used to fix the first adjusting frame on the first guide rail.
[0011] In the above-mentioned hydraulic cylinder testing fixture, there are two first guide rails, which are respectively arranged on both sides of the first adjusting frame.
[0012] In the aforementioned hydraulic cylinder testing fixture, the first adjusting frame has two spaced first connecting protrusions, each of which has a first limiting through hole. A first threaded hole is formed at the top of each first connecting protrusion. The first threaded hole communicates with the first limiting through hole. The first positioning device includes a first limiting rod and two first limiting bolts. The first limiting rod passes through the first limiting through holes of the two first connecting protrusions, and the two first limiting bolts are threaded into the first threaded holes. The bottom ends of the two first limiting bolts can contact the first limiting rod to lock the first limiting rod.
[0013] In the above-mentioned hydraulic cylinder testing fixture, the first limiting rod has two first positioning holes corresponding to the first screw hole, and the first limiting bolt can be inserted into the first positioning hole.
[0014] In the aforementioned hydraulic cylinder testing fixture, the second adjusting frame has two spaced second connecting protrusions, each of which has a second limiting through hole. A second threaded hole is provided at the top of the second connecting protrusion, and the second threaded hole communicates with the second limiting through hole. The second positioning device includes a second limiting rod and two second limiting bolts. The second limiting rod passes through the second limiting through holes of the two second connecting protrusions, and the two second limiting bolts are threadedly connected to the second threaded holes, with the bottom ends of the two second limiting bolts able to contact the second limiting rod to lock the second limiting rod.
[0015] In the above-mentioned hydraulic cylinder testing fixture, the second limiting rod has two second positioning holes corresponding to the second screw holes, and the second limiting bolt can be inserted into the second positioning holes.
[0016] In the above-mentioned hydraulic cylinder testing fixture, the driving component is a lead screw and nut assembly, which is connected to the second adjusting frame and is used to drive the second adjusting frame to move.
[0017] Compared with the prior art, this application has the following advantages:
[0018] In this application, based on the actual length of the hydraulic cylinder, the first adjusting bracket is slidable and adjusted to a suitable position before being fixed. The piston rod of the hydraulic cylinder is then connected to the first adjusting bracket via a first positioning device. The tail end of the hydraulic cylinder body is then connected to the second adjusting bracket via a second positioning device, completing the assembly of the hydraulic cylinder and the tooling, ensuring the hydraulic cylinder is in a stable state after installation. The drive assembly is then activated, causing the second adjusting bracket to move along the second guide rail. Since the tail end of the cylinder body is fixed to the second adjusting bracket, the cylinder body moves with the second adjusting bracket, while the piston rod remains stationary. This achieves relative displacement between the piston rod and the cylinder body, simulating the actual motion state of the hydraulic cylinder during operation, providing conditions for testing the one-way throttle valve. Attached Figure Description
[0019] Figure 1 This is a perspective view in this application;
[0020] Figure 2 This is a schematic diagram of the first and second limit rods after disassembly in this application;
[0021] Figure 3 yes Figure 2 A magnified view of a portion of position A in the middle;
[0022] Figure 4 yes Figure 2 A magnified view of a portion of position B in the middle;
[0023] Figure 5 This describes the state of the hydraulic cylinder after this device has been installed.
[0024] In the picture,
[0025] 100. Hydraulic cylinder; 101. Piston rod; 102. Cylinder body tail end;
[0026] 2. Base; 21. First guide rail; 211. Strip guide hole; 22. Second guide rail;
[0027] 3. First adjusting frame; 31. First positioning device; 311. First limiting rod; 3111. First positioning hole; 312. First limiting bolt; 32. Fastening bolt; 33. First connecting protrusion; 331. First limiting through hole; 332. First screw hole;
[0028] 4. Second adjusting frame; 41. Second positioning device; 411. Second limiting rod; 4111. Second positioning hole; 412. Second limiting bolt; 42. Second connecting protrusion; 421. Second limiting through hole; 422. Second screw hole;
[0029] 5. Driver components. Detailed Implementation
[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0031] like Figures 1 to 5As shown, a testing fixture for a hydraulic cylinder 100 includes: a base 2, a first adjusting frame 3, a second adjusting frame 4, and a drive assembly 5. A first guide rail 21 and a second guide rail 22 are mounted on the base 2. The first adjusting frame 3 is slidably mounted on the first guide rail 21, and can slide relative to or be fixed to the first guide rail 21. A first positioning device 31 is mounted on the first adjusting frame 3 for fixing the piston rod 101 of the hydraulic cylinder 100. The second adjusting frame 4 is slidably disposed on the second guide rail 22. The first adjusting frame 3 and the second adjusting frame 4 move in the same direction. A second positioning device 41 is mounted on the second adjusting frame 4 for fixing to the tail end 102 of the cylinder body of the hydraulic cylinder 100. The drive assembly 5 is connected to the second adjusting frame 4 and is used to drive the second adjusting frame 4 to move.
[0032] In this application, based on the actual length of the hydraulic cylinder 100, the first adjusting bracket 3 is slidable and adjusted to a suitable position before being fixed. The piston rod 101 of the hydraulic cylinder 100 is then connected to the first adjusting bracket 3 via the first positioning device 31. The tail end 102 of the cylinder body is then connected to the second adjusting bracket 4 via the second positioning device 41, completing the assembly of the hydraulic cylinder 100 with the tooling and ensuring that the hydraulic cylinder 100 is in a stable state after installation. The drive assembly 5 is activated, causing the second adjusting bracket 4 to move along the second guide rail 22. Since the tail end 102 of the cylinder body is fixed to the second adjusting bracket 4, the cylinder body moves with the second adjusting bracket 4, while the piston rod 101 remains stationary. This achieves relative displacement between the piston rod 101 and the cylinder body, simulating the motion state of the hydraulic cylinder 100 during actual operation and providing conditions for testing the one-way throttle valve.
[0033] The first adjustment frame 3 can slide along the corresponding first guide rail 21, and can adjust the fixed position according to the different length specifications of the hydraulic cylinder 100, without the need to customize tooling for each type of hydraulic cylinder 100, thus reducing testing costs.
[0034] There is a mounting hole at the end of the piston rod 101 of the hydraulic cylinder 100, and there is also a mounting hole at the tail end 102 of the cylinder body of the hydraulic cylinder 100.
[0035] Specifically, a strip-shaped guide hole 211 is provided on the first guide rail 21, and a number of fastening bolts 32 are threadedly connected to the first adjusting frame 3. The fastening bolts 32 pass through the strip-shaped guide hole 211 and are used to fix the first adjusting frame 3 on the first guide rail 21.
[0036] The strip-shaped guide hole 211 provides continuous sliding space for the first adjustment frame 3. Compared with the discrete positioning hole design, it can achieve fine adjustment at any position according to the length of the hydraulic cylinder 100 without being restricted by the fixed hole position. It can more accurately match the clamping size of different hydraulic cylinders 100. The fastening bolt 32 is threadedly connected to the first adjustment frame 3. After tightening, the adjustment frame can be firmly locked on the guide rail by the clamping force between the bolt head and the guide rail surface. During adjustment, the adjustment frame can be slid by loosening the bolt. After it is in place, the bolt is tightened to complete the fixation. No additional tools or complex structures are required.
[0037] Specifically, there are two first guide rails 21, which are respectively arranged on both sides of the first adjustment frame 3.
[0038] Two guide rails support the two sides of the first adjustment frame 3 respectively, which can evenly distribute the weight of the first adjustment frame 3 and the piston rod 101 of the oil cylinder 100 and the test reaction force to the first guide rails 21 on both sides, preventing the first adjustment frame 3 from tilting due to excessive force on one side, thereby avoiding positional deviation of the oil cylinder 100 after clamping, and ensuring the accuracy of the test benchmark.
[0039] Specifically, the first adjusting frame 3 has two spaced first connecting protrusions 33, each of which has a first limiting through hole 331. A first screw hole 332 is provided at the top of the first connecting protrusion 33. The first screw hole 332 communicates with the first limiting through hole 331. The first positioning device 31 includes a first limiting rod 311 and two first limiting bolts 312. The first limiting rod 311 passes through the first limiting through hole 331 of the two first connecting protrusions 33, and the two first limiting bolts 312 are threadedly connected to the first screw hole 332, and the two first limiting bolts 312 can contact the first limiting rod 311 to lock the first limiting rod 311.
[0040] The piston rod 101 of the hydraulic cylinder 100 is placed between the two first connecting protrusions 33, and then the first limiting rod 311 is passed through the first limiting through hole 331 on the two protrusions. At this time, the first limiting rod 311 passes through the piston rod 101 at the same time, forming a preliminary limiting constraint to prevent the piston rod 101 from moving up, down, left, or right.
[0041] Specifically, the first limiting rod 311 has two first positioning holes 3111 corresponding to the first screw hole 332, and the first limiting bolt 312 can be inserted into the first positioning hole 3111.
[0042] After the first limiting bolt 312 is inserted into the first positioning hole 3111, it can completely lock the first limiting rod 311 so that it cannot move.
[0043] Specifically, the second adjusting frame 4 has two spaced second connecting protrusions 42, each of which has a second limiting through hole 421. A second screw hole 422 is provided at the top of the second connecting protrusion 42, and the second screw hole 422 communicates with the second limiting through hole 421. The second positioning device 41 includes a second limiting rod 411 and two second limiting bolts 412. The second limiting rod 411 passes through the second limiting through holes 421 of the two second connecting protrusions 42, and the two second limiting bolts 412 are threadedly connected to the second screw holes 422, and the two second limiting bolts 412 can contact the second limiting rod 411 to lock the second limiting rod 411.
[0044] Place the cylinder tail end 102 of the hydraulic cylinder 100 between the two second connecting protrusions 42, and then pass the second limiting rod 411 through the second limiting through hole 421 on the two second connecting protrusions 42. At this time, the second limiting rod 411 passes through the cylinder tail end 102 at the same time, forming a preliminary limiting constraint to prevent the cylinder tail end 102 from moving up, down, left, or right.
[0045] Specifically, the second limiting rod 411 has two second positioning holes 4111 corresponding to the second screw hole 422, and the second limiting bolt 412 can be inserted into the second positioning hole 4111.
[0046] After the second limiting bolt 412 is inserted into the second positioning hole 4111, it can completely lock the second limiting rod 411 so that it cannot move.
[0047] Specifically, the drive component 5 is a lead screw and nut assembly, which is connected to the second adjusting frame 4 and is used to drive the second adjusting frame 4 to move.
[0048] Furthermore, the lead screw of the lead screw and nut assembly is rotatably mounted on the base 2, and the nut of the lead screw and nut assembly is fixedly connected to the second adjusting frame 4. Rotation of the lead screw can drive the nut and the second adjusting frame 4 to move. The lead screw requires an external motor to drive its rotation.
[0049] It should be noted that all directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, etc., are only used to explain the relative positional relationship and movement of the components in a specific posture, as shown in the attached figure. If the specific posture changes, the directional indication will also change accordingly.
[0050] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Meanwhile, the word "and / or" throughout the text means including three solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.
[0051] All of the above components are general standard parts or components known to those skilled in the art. Their structure and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.
[0052] The specific embodiments described herein are merely illustrative examples of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from this utility model or exceeding the scope defined by the appended claims.
Claims
1. A hydraulic cylinder testing fixture, characterized in that, include: The base (2) is equipped with a first guide rail (21) and a second guide rail (22). The first adjustment frame (3) is slidably mounted on the first guide rail (21), and the first adjustment frame (3) can slide relative to the first guide rail (21) or be fixed on the first guide rail (21); the first adjustment frame (3) is equipped with a first positioning device (31), which is used to fix the piston rod (101) of the oil cylinder (100). The second adjustment frame (4) is slidably mounted on the second guide rail (22). The first adjustment frame (3) and the second adjustment frame (4) move in the same direction. The second adjustment frame (4) is equipped with a second positioning device (41). The second positioning device (41) is used to fix the cylinder tail end (102) of the oil cylinder (100). A drive assembly (5) is connected to the second adjustment frame (4) and is used to drive the second adjustment frame (4) to move.
2. The hydraulic cylinder testing fixture according to claim 1, characterized in that, The first guide rail (21) has a strip-shaped guide hole (211), and the first adjustment frame (3) is threaded with several fastening bolts (32). The fastening bolts (32) pass through the strip-shaped guide hole (211) and are used to fix the first adjustment frame (3) on the first guide rail (21).
3. The hydraulic cylinder testing fixture according to claim 1, characterized in that, The first guide rail (21) has two rails, which are respectively arranged on both sides of the first adjustment frame (3).
4. The hydraulic cylinder testing fixture according to claim 1, characterized in that, The first adjusting frame (3) has two spaced first connecting protrusions (33), each of which has a first limiting through hole (331). A first screw hole (332) is provided at the top of the first connecting protrusion (33). The first screw hole (332) communicates with the first limiting through hole (331). The first positioning device (31) includes a first limiting rod (311) and two first limiting bolts (312). The first limiting rod (311) passes through the first limiting through hole (331) of the two first connecting protrusions (33), and the two first limiting bolts (312) are threadedly connected to the first screw hole (332), and the bottom ends of the two first limiting bolts (312) can contact the first limiting rod (311) to lock the first limiting rod (311).
5. The hydraulic cylinder testing fixture according to claim 4, characterized in that, The first limiting rod (311) has two first positioning holes (3111) corresponding to the first screw hole (332), and the first limiting bolt (312) can be inserted into the first positioning hole (3111).
6. The hydraulic cylinder testing fixture according to claim 1, characterized in that, The second adjusting frame (4) has two spaced second connecting protrusions (42), each of which has a second limiting through hole (421). A second screw hole (422) is provided at the top of the second connecting protrusion (42), and the second screw hole (422) communicates with the second limiting through hole (421). The second positioning device (41) includes a second limiting rod (411) and two second limiting bolts (412). The second limiting rod (411) passes through the second limiting through holes (421) of the two second connecting protrusions (42), and the second limiting bolts (412) are threadedly connected to the second screw holes (422), and the bottom ends of the two second limiting bolts (412) can contact the second limiting rod (411) to lock the second limiting rod (411).
7. The hydraulic cylinder testing fixture according to claim 6, characterized in that, The second limiting rod (411) has two second positioning holes (4111) corresponding to the second screw hole (422), and the second limiting bolt (412) can be inserted into the second positioning hole (4111).
8. The hydraulic cylinder testing fixture according to claim 1, characterized in that, The drive assembly (5) is a lead screw and nut assembly, which is connected to the second adjustment frame (4) and is used to drive the second adjustment frame (4) to move.