A hydraulic hose impact test testing device

Abstract

The present application relates to the technical field of hydraulic hose impact test, especially to a hydraulic hose impact test testing device, which comprises a test oil storage tank, a hydraulic flow main body, a plurality of hydraulic cylinder bodies and a vertical displacement driving unit, the plurality of hydraulic cylinder bodies are installed inside the hydraulic flow main body, the hydraulic oil is stored at the lower side of the plurality of hydraulic cylinder bodies inside the test oil storage tank, and a pump body structure for unidirectionally filling the oil in the test oil storage tank into the space at the lower side of the plurality of hydraulic cylinder bodies is installed outside the test oil storage tank. The present application can push the oil out quickly by the plurality of hydraulic cylinder bodies at the initial stage of downward movement through the hydraulic cylinder sleeve with the volume decreasing from outside to inside, meet the large-flow filling requirement of the hydraulic hose at the initial stage, and gradually reduce the moving hydraulic cylinder sleeve at the later stage of downward movement to finely increase the pressure with small displacement, so that the oil pressure change of fast filling and slow pressure is realized, and the accuracy of the test data is significantly improved.

Description

Technical Field

[0001] This invention relates to the technical field of hydraulic hose impact testing, and in particular to a hydraulic hose impact testing apparatus. Background Technology

[0002] Hydraulic hoses are flexible pressure-bearing pipelines that transport hydraulic oil in a hydraulic system, essentially acting as the system's "blood vessels." Compared to rigid pipes, their biggest advantages are their ability to absorb vibration, adapt to relative motion, and bypass obstacles. Hydraulic hoses consist of an outer rubber layer (abrasion-resistant and weather-resistant protective layer) to resist friction, ultraviolet rays, oil, and ozone; a reinforcing layer (steel wire braiding or winding) that acts as a pressure-bearing skeleton and determines the pressure rating; and an inner rubber layer (oil-resistant synthetic rubber) that directly contacts the hydraulic oil, preventing seepage and corrosion.

[0003] To ensure the quality of manufactured hydraulic hoses meets requirements, high-pressure hydraulic oil is injected into the hoses under test, and the maximum oil pressure experienced during hose rupture is tested. However, existing testing equipment injects oil into the hoses at a constant rate, but the initial oil pressure variation required for injection is relatively large. To ensure test accuracy, the smaller the pressure variation in the later stages of injection, the higher the test accuracy. Therefore, there is an urgent need in this field for a hydraulic hose impact testing device capable of variable-frequency injection of pressurized oil, which can meet the requirement of a large initial injection rate and a gradually decreasing rate of pressure variation in the later stages. Summary of the Invention

[0004] To address the problems mentioned in the background art, the present invention provides a hydraulic hose impact testing device.

[0005] The present invention provides a hydraulic hose impact test device, which adopts the following technical solution: including a test oil tank, a hydraulic flow body, a multi-section hydraulic cylinder and a vertical displacement drive unit.

[0006] The hydraulic flow body is installed inside the test oil storage tank.

[0007] The multi-section hydraulic cylinder is installed inside the hydraulic flow body. The hydraulic oil is stored inside the test oil tank on the lower side of the multi-section hydraulic cylinder. A pump structure is installed on the outside of the test oil tank to unidirectionally fill the space on the lower side of the multi-section hydraulic cylinder with the oil in the test oil tank.

[0008] The vertical displacement drive unit is installed on the top of the test oil tank, and drives multiple hydraulic cylinders to move up and down.

[0009] Optionally, the hydraulic flow body has flow holes on all four sides at the lower end. A hydraulic pipe connector is coaxially installed on the outside of the hydraulic flow body at the flow hole. The test tube is installed inside the test oil tank. The test tube is connected to the adjacent hydraulic pipe connector. A plug is installed at the other end of the test tube.

[0010] Optionally, the multi-section hydraulic cylinder body includes a main hydraulic shaft and multiple hydraulic cylinder sleeves. The multiple hydraulic cylinder sleeves are coaxially connected sequentially from the outside to the inside. Two connected hydraulic cylinder sleeves can slide against each other. The innermost hydraulic cylinder sleeve is coaxially sleeved on the main hydraulic shaft. The main hydraulic shaft is slidably connected to the hydraulic cylinder sleeves connected to it.

[0011] The vertical displacement drive unit is connected to the upper end of the main hydraulic shaft.

[0012] Optionally, the main hydraulic shaft and the outer ring surfaces of the multiple hydraulic cylinder sleeves are all provided with annular recesses, and the outer ring surfaces of the annular recesses of the main hydraulic shaft and the multiple hydraulic cylinder sleeves are all non-cylindrical surfaces. The inner ring surface of each hydraulic cylinder sleeve and the inner ring surface of the hydraulic flow body are provided with annular protrusions. The annular protrusions of the hydraulic flow body are slidably connected to the annular recesses of the outer ring surfaces of adjacent hydraulic cylinder sleeves. The annular protrusions of the inner ring surfaces of the hydraulic cylinder sleeves are slidably connected to the annular recesses of the adjacent inner hydraulic cylinder sleeves. The annular recesses on the outer side of the main hydraulic shaft are slidably connected to the annular protrusions on the inner side of the adjacent hydraulic cylinder sleeves.

[0013] Optionally, the vertical displacement drive unit includes a drive frame, side frames, drive gears, threaded shafts, and a gear ring. Two side frames and threaded shafts are provided. The two side frames are respectively installed on both sides of the test oil tank. The drive frame is located on the upper side of the two side frames. Both ends of the drive frame are threaded onto the outer side of the two threaded shafts. A driven gear is coaxially installed at the lower end of the threaded shaft. The gear ring is connected to the two side frames and rotates relative to the side frames. The driven gear meshes with the outer ring surface of the gear ring. The drive gear meshes with the adjacent driven gear and is connected to the adjacent side frame. The drive gear rotates with power relative to the side frame. The upper end of the main hydraulic shaft is connected to the drive frame.

[0014] Optionally, a support retaining ring is inserted and installed at the upper end of each hydraulic cylinder liner, and the support retaining ring can rotate elastically relative to the connected hydraulic cylinder liner.

[0015] Each support retaining ring has an upper shaft hole on its upper end face, and each hydraulic cylinder sleeve has a lower shaft hole on its upper end face located below the adjacent upper shaft hole. Each hydraulic cylinder sleeve has a segmented support rod on its upper side, which is located inside the adjacent upper and lower shaft holes. The upper end of the segmented support rod is connected to the upper end of the adjacent inner hydraulic cylinder sleeve, and the main hydraulic shaft is fixed to the upper end of the adjacent segmented support rod.

[0016] Optionally, each hydraulic cylinder liner has a through hole running vertically through it. A positioning rod is installed inside the through hole. The upper end of the positioning rod slides in contact with the adjacent upper support ring. The bottom surface of the support ring is provided with a spiral groove on the upper side of the positioning rod. The spiral groove is arranged in a spiral shape.

[0017] Optionally, each positioning rod is provided with a support column on its lower side, and the lower end of the support column is fixed to the bottom wall of the hydraulic flow body.

[0018] Optionally, the pump body structure includes an oil pump, a one-way oil supply pipe, and an oil extraction pipe. The oil pump is installed outside the test oil storage tank. One end of the one-way oil supply pipe is connected to the oil outlet end of the oil pump, and the other end of the one-way oil supply pipe is installed through the bottom of the hydraulic flow body. The oil flows unidirectionally into the hydraulic flow body inside the one-way oil supply pipe.

[0019] One end of the oil extraction pipe is bent and extends into the bottom of the test oil storage tank, while the other end of the oil extraction pipe is fixed to the oil extraction end of the oil pump.

[0020] In summary, the present invention has the following beneficial technical effects: This invention solves the problem of efficiency and accuracy in traditional equipment that cannot balance constant-speed oil filling by using a segmented contraction structure of multi-section hydraulic cylinders. By utilizing hydraulic cylinder liners with decreasing volume from the outside to the inside, the multi-section hydraulic cylinders push the oil to quickly discharge a large amount of oil in the initial stage of descent, meeting the high-flow filling requirements of the hydraulic hose in the initial stage. During descent, the moving hydraulic cylinder liners are gradually reduced, and the pressure is precisely increased with a small displacement, realizing the oil pressure change of fast filling and slow pressure, which significantly improves the accuracy of test data.

[0021] This invention ensures a rigid connection of the multi-section hydraulic cylinder body during the step-by-step pressure reduction process by precisely engaging the segmented struts after the support retaining ring rotates. When the segmented struts are misaligned with the upper shaft hole, the two adjacent hydraulic cylinder sleeves will not move relative to each other. This prevents relative positions from being generated when the hydraulic cylinder sleeves move to the lower side, thus preventing inaccurate control of the hydraulic step changes.

[0022] This invention achieves automatic stepped transition in the pressurization process through the helical engagement mechanism of the positioning push rod and the support retaining ring. When the positioning push rod does not push the helical groove of the support retaining ring, the upper shaft hole of the support retaining ring and the segmented support rod are misaligned. As multiple positioning push rods are blocked by the corresponding support columns in sequence, they push the corresponding support retaining rings to rotate in sequence. The sequential actions triggered by the mechanical structure can automatically control the hydraulic cylinder liners to fall in sequence, so that the pressure change rate of the hydraulic oil transitions smoothly in a stepped manner, accurately simulating the different levels of impact pressure that the hydraulic system experiences in actual working conditions. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure in an embodiment of the present invention; Figure 2This is a schematic diagram of the internal structure of the test oil storage tank in an embodiment of the present invention; Figure 3 This is a schematic diagram of the vertical displacement driving unit in an embodiment of the present invention; Figure 4 This is a schematic diagram of the internal structure of the hydraulic flow body in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the multi-section hydraulic cylinder in an embodiment of the present invention; Figure 6 This is a front view schematic diagram of some structures in an embodiment of the present invention; Figure 7 This is a schematic diagram of the distribution of support columns and positioning top rods in an embodiment of the present invention; Figure 8 This is a schematic diagram of the exploded structure of the hydraulic cylinder liner in an embodiment of the present invention.

[0024] Reference numerals in the attached diagram: 1. Test oil tank; 2. Hydraulic flow body; 21. Fluid flow hole; 22. Hydraulic pipe connector; 23. Test pipe body; 24. Plug; 3. Multi-section hydraulic cylinder body; 31. Main hydraulic shaft; 32. Hydraulic cylinder liner; 33. Support retaining ring; 34. Upper shaft hole; 35. Lower shaft hole; 36. Segmented support rod; 37. Through hole; 38. Positioning push rod; 39. Spiral groove; 310. Support column; 4. Pump body structure; 41. Oil pump; 42. One-way oil supply pipe; 43. Oil suction pipe; 5. Vertical displacement drive unit; 51. Drive frame; 52. Side frame; 53. Drive gear; 54. Threaded shaft; 55. Gear ring; 56. Driven gear. Detailed Implementation

[0025] The technical solutions of the embodiments of this application 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 this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0026] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0027] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0028] Furthermore, the use of terms such as "first" and "second" in this application 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 as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0029] The following is in conjunction with the appendix Figures 1-8 The present invention will be described in further detail below.

[0030] This invention discloses a hydraulic hose impact testing device. For example... Figures 1-8 As shown, it includes a test oil storage tank 1, a hydraulic flow body 2, a multi-section hydraulic cylinder 3, and a vertical displacement drive unit 5.

[0031] The hydraulic flow body 2 is installed inside the test oil tank 1. The hydraulic flow body 2 has flow holes 21 on all four sides at the lower end. A hydraulic pipe connector 22 is coaxially installed on the outside of the hydraulic flow body 2 at the flow holes 21. A test tube 23 is provided inside the test oil tank 1. The test tube 23 is connected to the adjacent hydraulic pipe connector 22. A plug 24 is installed at the other end of the test tube 23.

[0032] In the test, the hydraulic pipe connector 22 that was not installed was sealed by the plug 24 to prevent leakage of the hydraulic head. At the same time, the test pipe 23, which was sealed by the plug 24, sealed the oil inside.

[0033] A pump structure 4 is installed on the outside of the test oil tank 1 to unidirectionally fill the oil in the test oil tank 1 into the space below the multi-section hydraulic cylinder 3.

[0034] Specifically, the pump body structure 4 includes an oil pump 41, a one-way oil supply pipe 42, and an oil extraction pipe 43. The oil pump 41 is installed outside the test oil storage tank 1. One end of the one-way oil supply pipe 42 is connected to the oil outlet end of the oil pump 41, and the other end of the one-way oil supply pipe 42 is installed through the bottom of the hydraulic flow body 2. The oil flows into the hydraulic flow body 2 in one direction inside the one-way oil supply pipe 42.

[0035] One end of the oil extraction pipe 43 is bent and inserted into the bottom of the test oil storage tank 1, and the other end of the oil extraction pipe 43 is fixed to the oil extraction end of the oil pump 41.

[0036] During use, the test oil tank 1 is covered with a sealing cap. When the test tube 23 bursts during the test, the oil inside the test tube 23 is pumped out under pressure. The sealing cap blocks the oil inside the test oil tank 1 to prevent the oil from splashing. At the same time, during the test, the oil pump 41 fills the hydraulic flow body 2 with the oil from the test oil tank 1. Meanwhile, the one-way oil supply pipe 42 is equipped with a one-way valve to ensure that the oil can only flow into the hydraulic flow body 2 in one direction in the one-way oil supply pipe 42, preventing the oil from flowing back into the one-way oil supply pipe 42 during the hydraulic test.

[0037] The multi-section hydraulic cylinder 3 is installed inside the hydraulic flow body 2, and the hydraulic oil is stored on the lower side of the multi-section hydraulic cylinder 3 inside the test oil tank 1.

[0038] Specifically, the multi-section hydraulic cylinder body 3 includes a main hydraulic shaft 31 and multiple hydraulic cylinder sleeves 32. The multiple hydraulic cylinder sleeves 32 are coaxially connected from the outside to the inside. Two connected hydraulic cylinder sleeves 32 can slide against each other. The innermost hydraulic cylinder sleeve 32 is coaxially sleeved on the main hydraulic shaft 31. The main hydraulic shaft 31 is slidably connected to the connected hydraulic cylinder sleeves 32.

[0039] The volume of multiple hydraulic cylinder liners 32 gradually decreases from the outside to the inside, so that the amount of oil pushed by the multiple hydraulic cylinder liners 32 gradually decreases as they move downward from the outside to the inside. This allows oil to be quickly filled into the test tube 23 in the initial state. In the initial state, the adjacent hydraulic cylinder liners 32 are respectively at the top of the outer hydraulic cylinder liners 32, and the main hydraulic shaft 31 is located at the top of the adjacent outer hydraulic cylinder liners 32. The multiple hydraulic cylinder liners 32 and the main hydraulic shaft 31 move downward synchronously first. After the outermost hydraulic cylinder liner 32 moves to the bottom, the inner hydraulic cylinder liners 32 gradually move downward relative to the outer hydraulic cylinder liners 32, and the spatial change gradually decreases.

[0040] The vertical displacement drive unit 5 is installed on the top of the test oil tank 1. The vertical displacement drive unit 5 drives the multi-section hydraulic cylinder 3 to move up and down. The vertical displacement drive unit 5 is connected to the upper end of the main hydraulic shaft 31.

[0041] Specifically, the vertical displacement drive unit 5 includes a drive frame 51, side frames 52, drive gear 53, threaded shaft 54, and gear ring 55. There are two side frames 52 and threaded shaft 54. The two side frames 52 are respectively installed on both sides of the test oil tank 1. The drive frame 51 is set on the upper side of the two side frames 52. The two ends of the drive frame 51 are respectively threaded onto the outer side of the two threaded shafts 54. The lower end of the threaded shaft 54 ​​is coaxially mounted with a driven gear 56. The gear ring 55 is connected to the two side frames 52 and rotates relative to the side frames 52. The driven gear 56 meshes with the outer ring surface of the gear ring 55. The drive gear 53 meshes with the adjacent driven gear 56 and is connected to the adjacent side frame 52. The drive gear 53 rotates with power relative to the side frame 52. The upper end of the main hydraulic shaft 31 is connected to the drive frame 51.

[0042] In this embodiment, the side frame 52 is equipped with a motor that provides power to the drive gear 53. The drive gear 53 drives the meshing driven gear 56 to rotate. Under the meshing of the gear ring 55, the two driven gears 56 rotate synchronously. Then, as the two threaded shafts 54 rotate, they mesh with the drive frame 51 to drive the main hydraulic shaft 31 to move up and down.

[0043] Furthermore, in an optional embodiment, a support retaining ring 33 is inserted and installed at the upper end of each hydraulic cylinder liner 32. The support retaining ring 33 can rotate elastically relative to the connected hydraulic cylinder liner 32. The support retaining ring 33 and the connected hydraulic cylinder liner 32 are connected by an arc-shaped elastic telescopic rod.

[0044] Each support retaining ring 33 has an upper shaft hole 34 on its upper end face. Each hydraulic cylinder sleeve 32 has a lower shaft hole 35 on its upper end face below the adjacent upper shaft hole 34. Each hydraulic cylinder sleeve 32 has a segmented support rod 36 on its upper side. The segmented support rod 36 is located inside the adjacent upper shaft hole 34 and lower shaft hole 35. The upper end of the segmented support rod 36 is connected to the upper end of the adjacent inner hydraulic cylinder sleeve 32. The main hydraulic shaft 31 is fixed to the upper end of the adjacent segmented support rod 36.

[0045] Each hydraulic cylinder liner 32 has a through hole 37 extending vertically. A positioning rod 38 is provided inside the through hole 37. The upper end of the positioning rod 38 slides in contact with the adjacent upper support ring 33. The bottom surface of the support ring 33 is provided with a spiral groove 39 located above the positioning rod 38. The spiral groove 39 is arranged in a spiral shape.

[0046] Each positioning rod 38 is provided with a support column 310 on its lower side, and the lower end of the support column 310 is fixed to the inner bottom wall of the hydraulic flow body 2.

[0047] When the main hydraulic shaft 31 and multiple hydraulic cylinder liners 32 are at their highest positions on the upper side, the main hydraulic shaft 31 and multiple hydraulic cylinder liners 32 are arranged in a stepped, tower-like distribution. At this time, the segmented support rod 36 is located on the upper side of the corresponding support retaining ring 33. After the segmented support rod 36 and the upper shaft hole 34 of the support retaining ring 33 are distributed, the support retaining ring 33, under the elastic action with the hydraulic cylinder liners 32, drives the upper shaft hole 34 to be misaligned with the lower shaft hole 35 and the segmented support rod 36, ensuring that when the main hydraulic shaft 31 and multiple hydraulic cylinder liners 32 move downward, the multiple hydraulic cylinder liners 32 and the main hydraulic shaft 31 can move downward stably.

[0048] When the positioning push rod 38 is not in contact with the support column 310, the support retaining ring 33 causes the upper shaft hole 34 and the lower shaft hole 35 to be misaligned. When the main hydraulic shaft 31 and multiple hydraulic cylinder sleeves 32 move downwards synchronously, the positioning push rod 38 on the inner side of the outermost hydraulic cylinder sleeve 32 first contacts the adjacent lower support column 310. Under the push of the support column 310, the positioning push rod 38 moves upward relative to the hydraulic cylinder sleeve 32. When the positioning push rod 38 slides on the spiral wall of the spiral groove 39, it pushes the corresponding support retaining ring 33 to rotate, so that the upper shaft hole 34, the lower shaft hole 35 and the segmented support rod 36 are coaxial, so that the corresponding adjacent inner hydraulic cylinder sleeve 32 can drive the corresponding segmented support rod 36 to insert into the corresponding lower upper shaft hole 34 and lower shaft hole 35.

[0049] As multiple positioning push rods 38 gradually come into contact with the corresponding support columns 310 from the outside to the inside and are subjected to force, multiple hydraulic cylinder liners 32 gradually move downward from the outside to the inside, thereby gradually reducing the pressure change of the hydraulic oil and gradually adjusting the flow rate and pressure change of the hydraulic oil entering the test tube 23.

[0050] In this invention, a sealing structure is installed at the location through which the oil flows to ensure the stability of the oil pressure and prevent oil leakage.

[0051] The working principle is as follows: In the initial state, all the hydraulic cylinder sleeves 32 and the main hydraulic shaft 31 of the multi-section hydraulic cylinder body 3 are in the highest position. At this time, all the hydraulic cylinder sleeves 32 and the main hydraulic shaft 31 are arranged in a stepped tower shape. The two ends of the test tube 23 to be tested are connected to the hydraulic pipe connector 22 and the plug 24 respectively. The unused hydraulic pipe connector 22 is also sealed with the plug 24. The sealing cover is put on to prevent oil splashing during the test.

[0052] Start the oil pump 41. The oil pump 41 draws the oil from the bottom of the test oil tank 1 through the oil extraction pipe 43 and injects it into the space below the multi-section hydraulic cylinder 3 inside the hydraulic flow body 2 through the one-way oil supply pipe 42, thus completing the oil filling preparation.

[0053] Then the motor of the vertical displacement drive unit 5 is started, and the drive gear 53 drives the driven gear 56 to rotate. Under the meshing action of the gear ring 55, the two threaded shafts 54 rotate synchronously, driving the drive frame 51 to move downward, which in turn pushes the main hydraulic shaft 31 and all hydraulic cylinder liners 32 to move downward synchronously, quickly pressurizing oil into the tube body 23 to be tested, and quickly establishing the initial pressure.

[0054] During the overall downward movement, the positioning push rod 38 corresponding to the outermost hydraulic cylinder sleeve 32 first contacts the fixed support column 310 below. The support column 310 pushes the positioning push rod 38 upward, and the upper end of the positioning push rod 38 presses against the spiral groove 39 of the corresponding support retaining ring 33, pushing the support retaining ring 33 to rotate. This aligns the upper shaft hole 34 of the support retaining ring 33 with the lower shaft hole 35 of the lower hydraulic cylinder sleeve 32, allowing the segmented support rod 36 connected to the inner hydraulic cylinder sleeve 32 to enter the upper shaft hole 34 and the lower shaft hole 35, so that the inner hydraulic cylinder sleeve 32 can continue to move downward relative to the outer hydraulic cylinder sleeve 32.

[0055] Then, from the outside in, the positioning push rod 38 corresponding to each hydraulic cylinder liner 32 will contact the support column 310 in sequence, triggering the corresponding support retaining ring 33 to rotate in sequence, causing the inner hydraulic cylinder liner 32 to move downward relative to the outer hydraulic cylinder liner 32 in sequence. As the hydraulic cylinder liner 32 moves downward in segments, the cross-sectional area of ​​the multi-section hydraulic cylinder body 3 pressing the oil downward gradually decreases, and the pressure rise rate of the oil entering the test tube 23 gradually slows down, realizing step-by-step pressure rise, accurately simulating the hydraulic impact conditions under different pressure levels, until the test tube 23 can no longer withstand the pressure and bursts. The bursting oil is blocked by the sealing cap inside the test oil storage tank 1, preventing leakage and environmental pollution, and facilitating the reuse of the oil. At this time, the peak pressure at the bursting of the test tube 23 can be recorded, completing the impact performance test.

[0056] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A hydraulic hose impact testing device, characterized in that, include: Test oil storage tank (1); A hydraulic flow body (2) is installed inside the test oil storage tank (1); Multi-section hydraulic cylinder (3) is installed inside the hydraulic flow body (2). Hydraulic oil is stored in the test oil tank (1) on the lower side of the multi-section hydraulic cylinder (3). A pump structure (4) is installed on the outside of the test oil tank (1) to unidirectionally fill the oil in the test oil tank (1) into the space below the multi-section hydraulic cylinder (3). Vertical displacement drive unit (5) is installed on the top of the test oil tank (1) and drives the multi-section hydraulic cylinder (3) to move up and down.

2. The hydraulic hose impact testing device according to claim 1, characterized in that: The hydraulic flow body (2) has flow holes (21) on all four sides at the lower end. A hydraulic pipe connector (22) is coaxially installed on the outside of the hydraulic flow body (2) at the flow hole (21). A test pipe (23) is set inside the test oil tank (1). The test pipe (23) is connected to the adjacent hydraulic pipe connector (22). A plug (24) is installed at the other end of the test pipe (23).

3. The hydraulic hose impact test apparatus according to claim 1, characterized in that: The multi-section hydraulic cylinder body (3) includes a main hydraulic shaft (31) and multiple hydraulic cylinder sleeves (32). The multiple hydraulic cylinder sleeves (32) are coaxially connected from the outside to the inside. Two connected hydraulic cylinder sleeves (32) can slide against each other. The innermost hydraulic cylinder sleeve (32) among the multiple hydraulic cylinder sleeves (32) is coaxially sleeved on the main hydraulic shaft (31). The main hydraulic shaft (31) is slidably connected to the hydraulic cylinder sleeves (32) connected to it. The vertical displacement drive unit (5) is connected to the upper end of the main hydraulic shaft (31).

4. The hydraulic hose impact test apparatus according to claim 3, characterized in that: The outer ring surfaces of the main hydraulic shaft (31) and multiple hydraulic cylinder sleeves (32) are all provided with annular recesses. The outer ring surfaces of the annular recesses of the main hydraulic shaft (31) and multiple hydraulic cylinder sleeves (32) are all non-cylindrical. The inner ring surface of each hydraulic cylinder sleeve (32) and the inner ring surface of the hydraulic flow body (2) are provided with annular protrusions. The annular protrusions of the hydraulic flow body (2) are slidably connected to the annular recesses of the outer ring surfaces of the adjacent hydraulic cylinder sleeves (32). The annular protrusions of the inner ring surfaces of the hydraulic cylinder sleeves (32) are slidably connected to the annular recesses of the adjacent inner hydraulic cylinder sleeves (32). The annular recesses on the outer side of the main hydraulic shaft (31) are slidably connected to the annular protrusions on the inner side of the adjacent hydraulic cylinder sleeves (32).

5. The hydraulic hose impact testing device according to claim 3, characterized in that: The vertical displacement drive unit (5) includes a drive frame (51), a side frame (52), a drive gear (53), a threaded shaft (54), and a gear ring (55). There are two side frames (52) and two threaded shafts (54). The two side frames (52) are respectively installed on both sides of the test oil tank (1). The drive frame (51) is set on the upper side of the two side frames (52). The two ends of the drive frame (51) are respectively threaded onto the outer side of the two threaded shafts (54). The lower end of the threaded shaft (54) A driven gear (56) is coaxially mounted. A gear ring (55) is connected to two side frames (52). The gear ring (55) rotates relative to the side frames (52). The driven gear (56) meshes with the outer ring surface of the gear ring (55). The drive gear (53) meshes with the adjacent driven gear (56). The drive gear (53) is connected to the adjacent side frame (52). The drive gear (53) rotates relative to the side frame (52). The upper end of the main hydraulic shaft (31) is connected to the drive frame (51).

6. The hydraulic hose impact test apparatus according to claim 4, characterized in that: Each hydraulic cylinder liner (32) is fitted with a support retaining ring (33) at its upper end. The support retaining ring (33) can rotate elastically relative to the hydraulic cylinder liner (32) it is connected to. Each support ring (33) has an upper shaft hole (34) on its upper end face. Each hydraulic cylinder sleeve (32) has a lower shaft hole (35) on its upper end face below the adjacent upper shaft hole (34). Each hydraulic cylinder sleeve (32) has a segmented support rod (36) on its upper side. The segmented support rod (36) is located inside the adjacent upper shaft hole (34) and lower shaft hole (35). The upper end of the segmented support rod (36) is connected to the upper end of the adjacent inner hydraulic cylinder sleeve (32). The main hydraulic shaft (31) is fixed to the upper end of the adjacent segmented support rod (36).

7. The hydraulic hose impact test apparatus according to claim 6, characterized in that: Each hydraulic cylinder liner (32) has a through hole (37) that runs vertically through it. A positioning rod (38) is provided inside the through hole (37). The upper end of the positioning rod (38) slides in contact with the adjacent upper support ring (33). The bottom surface of the support ring (33) is provided with a spiral groove (39) on the upper side of the positioning rod (38). The spiral groove (39) is set in a spiral shape.

8. The hydraulic hose impact test apparatus according to claim 7, characterized in that: Each positioning rod (38) is provided with a support column (310) on its lower side, and the lower end of the support column (310) is fixed to the inner bottom wall of the hydraulic flow body (2).

9. The hydraulic hose impact test apparatus according to claim 1, characterized in that: The pump body structure (4) includes an oil pump (41), a one-way oil supply pipe (42) and an oil suction pipe (43). The oil pump (41) is installed outside the test oil storage tank (1). One end of the one-way oil supply pipe (42) is connected to the oil outlet end of the oil pump (41), and the other end of the one-way oil supply pipe (42) is installed through the bottom of the hydraulic flow body (2). The oil flows into the hydraulic flow body (2) in one direction inside the one-way oil supply pipe (42). One end of the oil extraction pipe (43) is bent and inserted into the bottom of the test oil storage tank (1), and the other end of the oil extraction pipe (43) is fixed to the oil extraction end of the oil pump (41).

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