Electro-hydraulic servo valve contamination wear test device

Abstract

The present invention discloses an electro-hydraulic servo valve contamination wear test device, comprising a base, an electro-hydraulic servo valve, an input end, a quick-change mechanism, a butt joint pipe, a sealing mechanism, a pipeline, a three-way valve, a liquid inlet pipe and a powder inlet, wherein the base is fixedly mounted with an electro-hydraulic servo valve, the electro-hydraulic servo valve is provided with an input end, the base is provided with a quick-change mechanism, the quick-change mechanism is provided with two symmetrically distributed butt joint pipes, each butt joint pipe is provided with a sealing mechanism, each butt joint pipe is evenly fixedly connected with a pipeline, a three-way valve is fixedly connected between the two pipelines, a liquid inlet pipe is fixedly connected to the three-way valve, and a powder inlet is fixedly connected to the butt joint pipe. The present invention relates to an electro-hydraulic servo valve contamination wear test device, which has the characteristics of good continuity, high accuracy and good sealing.

Description

Technical Field

[0001] The invention belongs to the technical field of electro-hydraulic servo valves, in particular to a contamination and wear testing device for electro-hydraulic servo valves. Background Art

[0002] At present, the test devices designed for hydraulic valve contamination all adopt the test method of adding standard AC test dust or MTD test dust from the outside. For example, the test circuit for hydraulic valve contamination sensitivity given in JB / T7857-2006 (Evaluation Method for Hydraulic Valve Contamination Sensitivity) is a test circuit designed by adding MTD test dust. However, there are two problems with the test method of applying AC test dust or MTD test dust from the outside: first, the continuity and sealing of the test are currently difficult to guarantee; second, the size and hardness of the pollutants encountered by the electro-hydraulic servo valve in actual use are complex and variable. If only single hardness pollutant particles are used to replace the pollutants in actual use for testing, the test results will have a certain deviation from the actual situation. Summary of the invention

[0003] The purpose of the present invention is to provide an electro-hydraulic servo valve contamination wear test device in order to solve the above problems, thereby solving the problems mentioned in the background technology.

[0004] In order to solve the above problems, the present invention provides a technical solution:

[0005] The contamination and wear testing device for an electro-hydraulic servo valve comprises a base, an electro-hydraulic servo valve, an input end, a quick-change mechanism, a butt joint pipe, a sealing mechanism, a pipeline, a three-way valve, a liquid inlet pipe and a powder inlet, wherein the base is fixedly mounted with the electro-hydraulic servo valve, the electro-hydraulic servo valve is provided with an input end, the base is provided with a quick-change mechanism, the quick-change mechanism is provided with two symmetrically distributed butt joint pipes, each butt joint pipe is provided with a sealing mechanism, each butt joint pipe is evenly and fixedly connected with pipelines, a three-way valve is fixedly connected between the two pipelines, the three-way valve is fixedly connected with a liquid inlet pipe, and the butt joint pipe is fixedly connected with a powder inlet.

[0006] Preferably, the powder inlet is connected with a cap through a thread, and the cap is made of plastic material. The design of the cap has a blocking effect on the powder inlet.

[0007] Preferably, the quick-change mechanism comprises a guide groove, a guide rod, a guide block, a fixed ring, a turntable, a ball, a ring groove and a first spring. The base is provided with a guide groove, the guide groove is fixedly connected with a guide rod, the guide rod is slidably connected with the guide block outside, the guide block is slidably connected with the guide groove, the guide rod is sleeved with a first spring outside, one end of the first spring is fixedly connected with the guide block, the other end of the first spring is fixedly connected with the inner surface of the guide groove, the top of the guide block is fixedly connected with a fixed ring, the outside of the fixed ring is rotatably connected with a turntable, a ball is arranged on the fixed ring, the ball contacts the turntable, and a butt joint is fixedly connected inside the turntable. By pushing the turntable, the turntable drives the fixed ring to move horizontally, the fixed ring drives the guide block to slide in the guide groove and compress the first spring, and then the turntable is rotated so that one of the butt joints is flush with the input end of the electro-hydraulic servo valve.

[0008] Preferably, there are multiple balls, which are evenly distributed on the fixing ring. The design of the balls can assist the rotation of the turntable on the fixing ring.

[0009] Preferably, the rotating disk is provided with an annular groove, in which a fixing ring is rotatably connected. The design of the annular groove has a certain limiting effect on the rotating disk.

[0010] Preferably, the sealing mechanism includes a retaining ring, a sealing ring, an internally threaded sleeve, a sliding rod, a second spring, an articulated seat, a pressure rod, a pin, a slot, a push rod and a third spring. The input end is fixedly connected to an externally threaded block on the outside, the butt tube is fixedly connected to a retaining ring on the outside, a sealing ring is embedded in the retaining ring, the sealing ring contacts the externally threaded block, the butt tube is movably sleeved on the outside of the butt tube, the internally threaded sleeve is threadedly connected to the externally threaded block, a sliding rod is slidably connected in the internally threaded sleeve, the sliding rod contacts the retaining ring, the external sleeve of the sliding rod is sleeved with a second spring, one end of the second spring contacts the retaining ring, the other end of the second spring is fixedly connected to the inner surface of the internally threaded sleeve, the externally fixed seat of the internally threaded sleeve is fixedly connected to a pressure rod, the pressure rod is fixedly connected with a pin, the pin is slidably connected to the externally threaded block, a push rod is slidably connected in the internally threaded sleeve, the push rod contacts the pressure rod, and a third spring is arranged in the internally threaded sleeve. By pressing one end of the pressure rod, the pressure rod drives the push rod to slide in the internal threaded sleeve, and the spring is compressed while the push rod slides, and then the internal threaded sleeve is pulled toward the input end, and is threadedly connected with the external external threaded block outside the input end. At this time, the second spring is compressed, so that the retaining ring is close to the external threaded block, and the sealing ring on the retaining ring is compressed, and then the pressure rod is released. At this time, the third spring pushes the push rod back to the top, and the push rod pushes the pressure rod back to the top, and the pin on the pressure rod is inserted into the groove on the external threaded block, so that the sealing ring is close to the external threaded block, thereby ensuring the sealing of the medium flow during the test.

[0011] Preferably, one end of the third spring is fixedly connected to a push rod, and the other end of the third spring is fixedly connected to the inner surface of the internal thread sleeve. The design of the third spring can assist the push rod in resetting.

[0012] Preferably, a slot is provided on the surface of the external thread block, a bayonet is slidably connected in the slot, and the number of the slots is multiple, and the multiple slots are distributed in an annular shape on the external thread block. The slot design cooperates with the bayonet to prevent the internal thread sleeve from loosening.

[0013] The beneficial effects of the present invention are as follows: the present invention relates to an electro-hydraulic servo valve contamination wear test device, which has the characteristics of good continuity, high accuracy and good sealing. In specific use, compared with the prior art, it has the following beneficial effects:

[0014] First, a quick-change mechanism is set on the base, and then two identical butt joints are set on the quick-change mechanism, and a powder inlet is set on the butt joints. The two butt joints can be quickly replaced by the quick-change mechanism, and then AC test dust of different sizes is added to the two butt joints, which ensures the continuity of the test and improves the accuracy of the test.

[0015] Secondly, a sealing mechanism is jointly arranged between the butt joint tube and the input end of the electro-hydraulic servo valve, wherein a retaining ring is fixed on the outside of the butt joint tube, a sealing ring is arranged on the retaining ring, and then through the cooperation between the bayonet pin and the slot, the spring in the internal threaded sleeve can exert a reaction force on the retaining ring, thereby making the sealing ring close to the input end of the electro-hydraulic servo valve, thereby ensuring the sealing of the medium flow during the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] For ease of explanation, the present invention is described in detail with reference to the following specific implementations and the accompanying drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 For the present invention Figure 1 A magnified view of the structure of part A;

[0019] Figure 3 For the present invention Figure 2 A side view of a turntable;

[0020] Figure 4 For the present invention Figure 2 A side sectional view of a fixing ring;

[0021] Figure 5 For the present invention Figure 1 An enlarged cross-sectional view of the sealing mechanism;

[0022] Figure 6 For the present invention Figure 1 main view.

[0023] In the figure: 1. base; 2. electro-hydraulic servo valve; 3. input end; 31. external thread block; 4. quick change mechanism; 41. guide groove; 42. guide rod; 43. guide block; 44. fixing ring; 45. turntable; 46. ball; 47. ring groove; 48. first spring; 5. butt joint; 6. sealing mechanism; 61. retaining ring; 62. sealing ring; 63. internal thread sleeve; 64. sliding rod; 65. second spring; 66. hinged seat; 67. pressure rod; 68. bayonet pin; 69. bayonet groove; 610. ejector rod; 611. third spring; 7. pipeline; 8. three-way valve; 9. liquid inlet pipe; 10. powder inlet; 11. cap. DETAILED DESCRIPTION

[0024] like Figure 1-6 As shown, this specific implementation adopts the following technical solutions:

[0025] Example:

[0026] The contamination and wear test device of the electro-hydraulic servo valve comprises a base 1, an electro-hydraulic servo valve 2, an input end 3, a quick-change mechanism 4, a butt joint pipe 5, a sealing mechanism 6, a pipeline 7, a three-way valve 8, a liquid inlet pipe 9 and a powder inlet 10. The electro-hydraulic servo valve 2 is fixedly installed on the base 1, the electro-hydraulic servo valve 2 is provided with an input end 3, the base 1 is provided with a quick-change mechanism 4, the quick-change mechanism 4 is provided with two symmetrically distributed butt joint pipes 5, each butt joint pipe 5 is provided with a sealing mechanism 6, each butt joint pipe 5 is evenly and fixedly connected with a pipeline 7, a three-way valve 8 is fixedly connected between the two pipelines 7, a liquid inlet pipe 9 is fixedly connected to the three-way valve 8, the liquid inlet pipe 9 is a hose, and there is no obvious collapse when twisted 90 degrees, and a powder inlet 10 is fixedly connected to the butt joint pipe 5.

[0027] The powder inlet 10 is connected with a cap 11 by threading, and the cap 11 is made of plastic material. The design of the cap 11 has a blocking effect on the powder inlet 10.

[0028] Among them, the quick-change mechanism 4 includes a guide groove 41, a guide rod 42, a guide block 43, a fixed ring 44, a turntable 45, a ball 46, an annular groove 47 and a first spring 48. The base 1 is provided with a guide groove 41, the guide groove 41 is fixedly connected with the guide rod 42, the outside of the guide rod 42 is slidably connected with the guide block 43, the guide block 43 is slidably connected to the guide groove 41, the outside of the guide rod 42 is sleeved with the first spring 48, one end of the first spring 48 is fixedly connected with the guide block 43, the other end of the first spring 48 is fixedly connected to the inner surface of the guide groove 41, the top of the guide block 43 is fixedly connected with the fixing ring 44, the outside of the fixing ring 44 is rotatably connected with the turntable 45, the fixing ring 44 is provided with a ball 46, the ball 46 is in contact with the turntable 45, and the turntable 45 is fixedly connected with the docking tube 5. By pushing the turntable 45 , the turntable 45 drives the fixed ring 44 to move horizontally, and the fixed ring 44 drives the guide block 43 to slide in the guide groove 41 and compress the first spring 48 , and then the turntable 45 is rotated so that one of the butt joints 5 is flush with the input end 3 of the electro-hydraulic servo valve 2 .

[0029] There are multiple balls 46, which are evenly distributed on the fixing ring 44. The design of the balls 46 assists the rotation of the rotating disk 45 on the fixing ring 44.

[0030] The rotating disk 45 is provided with an annular groove 47, and a fixing ring 44 is rotatably connected in the annular groove 47. The design of the annular groove 47 has a certain limiting effect on the rotating disk 45.

[0031] The sealing mechanism 6 includes a retaining ring 61, a sealing ring 62, an internally threaded sleeve 63, a sliding rod 64, a second spring 65, a hinge seat 66, a pressure rod 67, a bayonet pin 68, a slot 69, a push rod 610 and a third spring 611. The external part of the input end 3 is fixedly connected with the external thread block 31, the external part of the butt joint 5 is fixedly connected with a retaining ring 61, the retaining ring 61 is embedded with a sealing ring 62, the sealing ring 62 is in contact with the external thread block 31, the external part of the butt joint 5 is movably sleeved with an internally threaded sleeve 63, the internally threaded sleeve 63 is threadedly connected to the external thread block 31, and the internally threaded sleeve 63 is slidably connected with The slide rod 64 contacts the retaining ring 61, the outer part of the slide rod 64 is sleeved with a second spring 65, one end of the second spring 65 contacts the retaining ring 61, the other end of the second spring 65 is fixedly connected to the inner surface of the internal threaded sleeve 63, the outer part of the internal threaded sleeve 63 is fixedly connected with a hinge seat 66, a pressure rod 67 is hinged on the hinge seat 66, a bayonet 68 is fixedly connected to the pressure rod 67, the bayonet 68 is slidably connected to the external thread block 31, a push rod 610 is slidably connected inside the internal threaded sleeve 63, the push rod 610 contacts the pressure rod 67, and a third spring 611 is arranged inside the internal threaded sleeve 63. By pressing the raised end of the pressure rod 67, the pressure rod 67 drives the push rod 610 to slide in the internal threaded sleeve 63, and the push rod 610 will compress the third spring 611 while sliding, and then pull the internal threaded sleeve 63 toward the direction of the input end 3, and threadedly connect it with the external threaded block 31 outside the input end 3. At this time, the second spring 65 is compressed, so that the retaining ring 61 is close to the external threaded block 31, and the sealing ring 62 on the retaining ring 61 is compressed, and then the pressure rod 67 is released. At this time, the third spring 611 pushes the push rod 610 back to the top, and the push rod 610 pushes the pressure rod 67 back to the top, and the pin 68 on the pressure rod 67 is inserted into the groove 69 on the external threaded block 31, so that the sealing ring 62 is close to the external threaded block 31, thereby ensuring the sealing of the medium circulation during the test.

[0032] One end of the third spring 611 is fixedly connected to the push rod 610, and the other end of the third spring 611 is fixedly connected to the inner surface of the internal thread sleeve 63. The design of the third spring 611 can assist the push rod 610 in resetting.

[0033] Among them, a slot 69 is provided on the surface of the external thread block 31, and a bayonet pin 68 is slidably connected in the slot 69. There are multiple slots 69, and the multiple slots 69 are distributed in an annular shape on the external thread block 31. Through the design of the slot 69, in cooperation with the bayonet pin 68, the internal thread sleeve 63 has a loosening prevention effect.

[0034] The present invention is used in the following manner: when in use, the turntable 45 is manually pushed horizontally, the turntable 45 drives the fixing ring 44 to move horizontally, the fixing ring 44 drives the guide block 43 to slide in the guide groove 41 and compress the first spring 48, and then the turntable 45 is rotated so that one of the butt joints 5 is flush with the input end 3 of the electro-hydraulic servo valve 2, and then the raised end of the pressure rod 67 is pressed, at which time the pressure rod 67 drives the push rod 610 to slide in the internal threaded sleeve 63, and while the push rod 610 slides, the third spring 611 is compressed, and then the internal threaded sleeve 63 is moved toward the input end. 3, and is threadedly connected with the external thread block 31 outside the input end 3. At this time, the second spring 65 is compressed, so that the retaining ring 61 is close to the external thread block 31, and the sealing ring 62 on the retaining ring 61 is compressed, and then the pressure rod 67 is released. At this time, the third spring 611 pushes the push rod 610 back to the top, and the push rod 610 pushes the pressure rod 67 back to the top. The bayonet 68 on the pressure rod 67 is inserted into the bayonet groove 69 on the external thread block 31, so that the sealing ring 62 is close to the external thread block 31, thereby ensuring the sealing of the medium circulation during the test;

[0035] Then add AC test dust from the powder inlet 10 of the current butt joint tube 5, cover the cap 11, and then open the three-way valve 8 to allow the liquid inlet pipe 9 to flow into the current butt joint tube 5, and then the circulating medium flushes the AC test dust into the electro-hydraulic servo valve 2 to carry out the pollution wear test. After a period of test, separate the current butt joint tube 5 from the input end 3, close the three-way valve 8, and then rotate the turntable 45 to exchange the positions of the two butt joint tubes 5, and then connect the sealing mechanism 6 of the other butt joint tube 5 with the input end 3, and then add AC test dust of different particle sizes to the powder inlet 10 of the other butt joint tube 5. This not only improves the accuracy of the test, but also ensures the continuity of the test.

Claims

1. An electro-hydraulic servo valve contamination wear test device, comprising a base (1), an electro-hydraulic servo valve (2), an input end (3), a quick-change mechanism (4), a butt joint (5), a sealing mechanism (6), a pipeline (7), a three-way valve (8), a liquid inlet pipe (9) and a powder inlet (10), characterized in that: An electro-hydraulic servo valve (2) is fixedly mounted on the base (1), an input end (3) is provided on the electro-hydraulic servo valve (2), a quick-change mechanism (4) is provided on the base (1), two symmetrically distributed butt joints (5) are provided on the quick-change mechanism (4), each butt joint (5) is provided with a sealing mechanism (6), each butt joint (5) is evenly and fixedly connected to a pipeline (7), a three-way valve (8) is fixedly connected between the two pipelines (7), a liquid inlet pipe (9) is fixedly connected to the three-way valve (8), and a powder inlet (10) is fixedly connected to the butt joint (5); The quick-change mechanism (4) comprises a guide groove (41), a guide rod (42), a guide block (43), a fixed ring (44), a rotating disk (45), a ball (46), a ring groove (47) and a first spring (48). The base (1) is provided with a guide groove (41), the guide rod (42) is fixedly connected to the inside of the guide groove (41), the guide block (43) is slidably connected to the outside of the guide rod (42), the guide block (43) is slidably connected to the guide groove (41), and the outside of the guide rod (42) is fixedly connected to the outside of the guide groove (41). A first spring (48) is sleeved on the top, one end of the first spring (48) is fixedly connected to the guide block (43), the other end of the first spring (48) is fixedly connected to the inner surface of the guide groove (41), the top of the guide block (43) is fixedly connected to the fixing ring (44), the outside of the fixing ring (44) is rotatably connected to the turntable (45), a ball (46) is provided on the fixing ring (44), the ball (46) contacts the turntable (45), and the turntable (45) is fixedly connected to the butt joint pipe (5); The sealing mechanism (6) includes a retaining ring (61), a sealing ring (62), an internal threaded sleeve (63), a sliding rod (64), a second spring (65), a hinge seat (66), a pressure rod (67), a latch (68), a slot (69), a push rod (610) and a third spring (611). The external part of the input end (3) is fixedly connected to the external threaded block (31). The external part of the butt joint (5) is fixedly connected to the retaining ring (61). The retaining ring (61) is embedded with a sealing ring (62). The sealing ring (62) contacts the external threaded block (31). The external part of the butt joint (5) is movably sleeved with an internal threaded sleeve (63). The internal threaded sleeve (63) is threadedly connected to the external threaded block (31). The internal threaded sleeve (63) is slidably connected to the internal threaded sleeve (63). A slide rod (64) is connected, the slide rod (64) contacts the retaining ring (61), the outer sleeve of the slide rod (64) is sleeved with a second spring (65), one end of the second spring (65) contacts the retaining ring (61), the other end of the second spring (65) is fixedly connected to the inner surface of the internal threaded sleeve (63), the outer portion of the internal threaded sleeve (63) is fixedly connected to a hinge seat (66), a pressure rod (67) is hinged on the hinge seat (66), a bayonet (68) is fixedly connected to the pressure rod (67), the bayonet (68) is slidably connected to the external thread block (31), a push rod (610) is slidably connected to the inner portion of the internal threaded sleeve (63), the push rod (610) contacts the push rod (67), and a third spring (611) is provided in the internal threaded sleeve (63); One end of the third spring (611) is fixedly connected to the push rod (610), and the other end of the third spring (611) is fixedly connected to the inner surface of the internal threaded sleeve (63); A clamping groove (69) is provided on the surface of the external thread block (31), and a clamping pin (68) is slidably connected in the clamping groove (69). There are multiple clamping grooves (69), and the multiple clamping grooves (69) are distributed in an annular shape on the external thread block (31).

2. The electro-hydraulic servo valve contamination wear test device according to claim 1, characterized in that: The powder inlet (10) is connected to a cap (11) via a thread, and the cap (11) is made of plastic.

3. The electro-hydraulic servo valve contamination wear test device according to claim 1, characterized in that: There are multiple balls (46), and the multiple balls (46) are evenly distributed on the fixing ring (44).

4. The electro-hydraulic servo valve contamination wear test device according to claim 1, characterized in that: The rotating disk (45) is provided with an annular groove (47), and a fixing ring (44) is rotatably connected in the annular groove (47).

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