Air tightness detection device for stator coil assembly of electro-hydraulic servo valve

Abstract

The utility model discloses an air tightness detection device for a stator coil assembly of an electro-hydraulic servo valve, which comprises a water tank and a support, a cylinder is arranged in the water tank, a hollow transmission shaft is rotatably arranged on the cylinder, and a gear motor is arranged on the support; a cam ring groove is formed in the circumferential outer wall of the cylinder; a first rotating disc is fixedly arranged on the hollow transmission shaft, a plurality of linear bearings are arranged on the circumferential outer wall of the first rotating disc at equal intervals, lifting rods are arranged on the linear bearings in a sliding mode, rollers arranged at the bottom ends of the lifting rods are embedded in cam ring grooves, and fixing tools are arranged at the top ends of the lifting rods. A rotating disc II is arranged on the hollow transmission shaft, an automatic retractor is arranged on the rotating disc II, an inflation connecting pipe is wound on the automatic retractor, and an air outlet of the inflation connecting pipe is connected with an inflation connector assembly; the air tightness detection device for the stator coil assembly has the advantages that the air tightness detection efficiency of the stator coil assembly is high, the detection is convenient, and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to electro -hydraulic servo valve technical field, concretely is a kind of electro -hydraulic servo valve's stator coil subassembly air tightness detection device. BACKGROUND

[0002] Electro-hydraulic servo valve is a kind of electro -hydraulic control element, by solenoid valve, valve core, valve body, spring and the like component composition. Its main function is to convert electric signal into hydraulic signal, realizes the control to hydraulic actuator. Wherein solenoid valve is one of the core components in electro-hydraulic servo valve, stator coil subassembly in solenoid valve is the core component of solenoid valve, the existing stator coil subassembly is usually by stator end cap 800 and coil cover 900 welding, as shown in Fig. 1-2 Positioning notch 801 is equipped on the circumference side wall of stator end cap 800, and the center of the bottom end of stator end cap 800 is provided with conical counterbore 802, and shaft shoulder 901 is provided on coil cover 900, and the welding seam of coil cover 900 and stator end cap 800 is prone to have poor strength, and air hole is prone to be generated, seriously affect the reliable stability of solenoid valve, so it is needed to detect the air tightness of stator coil subassembly after welding;The air tightness of existing stator coil subassembly is detected by supplying gas pipe assembly to its inside inflation, then the stator coil subassembly and gas supply pipe assembly after inflation are put into water by artificial observation whether there is bubble to generate, to judge whether stator coil subassembly has air hole, but there is the problem of low efficiency of stator coil subassembly air tightness detection, air tightness detection is not convenient. UTILITY MODEL CONTENTS

[0003] The utility model solves the technical problem to overcome the existing defects, provide a kind of electro -hydraulic servo valve's stator coil subassembly air tightness detection device, can continuously carry out stator coil subassembly air tightness detection, and detection efficiency is high, air tightness detection is convenient;And stator coil subassembly is stable, there is no bubble disturbance when being immersed in water, can effectively solve the problem in background art.

[0004] In order to achieve the above object, the utility model provides following technical scheme: a kind of stator coil assembly air tightness detection device of electro-hydraulic servo valve, including sink and the support that is equipped on its side wall, support is inverted L type plate structure, and the support platform at support top is located above sink, the bottom end of the inside of sink is fixed with cylinder, hollow transmission shaft is rotationally arranged on cylinder, and the top of hollow transmission shaft is rotationally connected with the support platform of support by rotary support, and support is equipped with the speed reducer motor that can drive hollow transmission shaft rotation;Cam ring groove is formed on the circumferential outer wall of cylinder;Fixed disc one is fixed on the position of hollow transmission shaft close to cylinder, and the circumferential outer wall of fixed disc one is equipped with multiple linear bearings at equal intervals, and linear bearing is slidably equipped with vertically sliding lifting rod, and the bottom end of lifting rod is equipped with roller, and the roller is nested in cam ring groove, and the top of lifting rod is equipped with fixed tooling;Fixed disc two is fixed on the above of hollow transmission shaft, and automatic coiling device is equipped on fixed disc two at the position corresponding to fixed tooling, and inflation connecting pipe is wound on automatic coiling device, and inflation connector assembly is connected to the gas outlet of inflation connecting pipe;Rotary gas connector is equipped on the support platform of support, and the rotary joint of rotary gas connector is connected with pipe connector for supplying gas to each inflation connecting pipe, and support is also equipped with gas supply pump connected with the gas inlet of rotary gas connector.

[0005] Further, the fixed tooling includes a bottom plate fixedly connected with the lifting rod, a recess is formed at the center of the top surface of the bottom plate, a spring is nested in the recess, a ball is arranged at the top end of the spring, and a lock opening for limiting the ball from falling out is arranged at the opening of the recess.

[0006] Further, the pipe connector is fixedly nested in the upper end of the hollow transmission shaft, a plurality of gas outlets are equidistantly arranged on the circumferential outer wall of the pipe connector and communicate with the inner cavity of the pipe connector, and the gas outlets all penetrate through the hollow transmission shaft and are connected with the corresponding inflation connecting pipes.

[0007] Further, the inflation connector assembly includes a quick-connect ball valve connected with the inflation connecting pipe, a gas pressure detection pipe is connected to the gas outlet end of the quick-connect ball valve, a gas inflation nozzle is arranged at the gas outlet end of the gas pressure detection pipe, and a sealing ring is fixedly arranged on the circumferential outer wall of the gas inflation nozzle.

[0008] Further, a driving gear is fixedly arranged on the rotating shaft of the speed reducer motor, a driven gear is arranged at the upper end of the circumferential outer wall of the hollow transmission shaft, and the driving gear and the driven gear are meshed with each other.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows: The stator coil assembly airtightness testing device of this electro-hydraulic servo valve fixes and positions the stator coil assembly through a fixing fixture, seals the stator coil assembly through an air inflator assembly, inflates the stator coil assembly with air through an air supply pump, a rotary air connector, a pipe connector, and an air inflator connection pipe, observes the air pressure inside the stator coil assembly through a pressure gauge, drives the stator coil assembly to rotate and descend into the water for airtightness testing through a geared motor, and drives the stator coil assembly to rotate and rise out of the water surface through a geared motor; it can continuously perform airtightness testing of the stator coil assembly, with high testing efficiency and convenient airtightness testing; and the stator coil assembly rises and falls smoothly without air bubble interference when submerged in water. Attached Figure Description

[0010] Fig. 1 This is a schematic diagram of an existing stator coil assembly structure;

[0011] Fig. 2 A cross-sectional view of an existing stator coil assembly;

[0012] Fig. 3 This is a schematic diagram of the structure of this utility model;

[0013] Fig. 4 This is a top view of the water tank of this utility model;

[0014] Fig. 5 This is a partial cross-sectional view of the bracket of this utility model located at the rotary air joint;

[0015] Fig. 6 This is a schematic diagram of the fixing fixture structure of this utility model;

[0016] Fig. 7 This is a sectional view of the base plate of this utility model;

[0017] Fig. 8 This is a schematic diagram of the structure of the air inflator assembly of this utility model.

[0018] In the diagram: 1. Water tank; 2. Cylinder; 21. Cam ring groove; 3. Bracket; 4. Gear motor; 41. Drive gear; 5. Hollow drive shaft; 51. Driven gear; 6. Turntable one; 61. Linear bearing; 62. Lifting rod; 63. Roller; 7. Fixture; 71. Base plate; 711. Spring; 712. Ball bearing; 713. Positioning block; 72. Vertical rod; 73. Semicircular ring; 8. Turntable two; 81 9. Automatic retractor; 10. Rotary air connector; 11. Pipe connector; 12. Air outlet pipe; 13. Inflation connection pipe; 14. Inflation connector assembly; 15. Quick-connect ball valve; 16. Air pressure detection pipe; 17. Air pressure gauge; 18. Inflation nozzle; 19. Sealing ring; 10. Air supply pump; 10. Stator end cover; 10. Positioning notch; 11. Tapered countersunk hole; 12. Coil sleeve; 13. Shaft shoulder. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0020] Please see Fig. 3-8 This utility model provides a technical solution: a device for detecting the air tightness of the stator coil assembly of an electro-hydraulic servo valve, including a water tank 1 and a support 3 provided on its side wall. The support 3 is an inverted L-shaped plate structure, and the support platform at the top of the support 3 is located above the water tank 1. A cylinder 2 is fixedly provided at the bottom inside the water tank 1. A hollow transmission shaft 5 is rotatably provided on the cylinder 2 and coaxially arranged therewith. The top of the hollow transmission shaft 5 is rotatably connected to the support platform of the support 3 through a slewing bearing. A reduction motor 4 is provided on the support 3. A drive gear 41 is fixedly provided on the shaft of the reduction motor 4. A driven gear 51 is provided at the upper end of the outer circumference of the hollow transmission shaft 5, and the drive gear 41 and the driven gear 51 mesh with each other.

[0021] A cam ring groove 21 is provided on the outer circumference of the cylinder 2; a turntable 6 is fixed on the hollow transmission shaft 5 near the cylinder 2, and multiple linear bearings 61 are provided at equal intervals on the outer circumference of the turntable 6. A vertically sliding lifting rod 62 is slidably provided on the linear bearing 61. The bottom end of the lifting rod 62 is provided with a roller 63, and the roller 63 is nested in the cam ring groove 21. The top end of the lifting rod 62 is provided with a fixing fixture 7.

[0022] The fixed fixture 7 includes a base plate 71 fixedly connected to the lifting rod 62. A groove is provided at the center of the top surface of the base plate 71, and a spring 711 is nested in the groove. A ball bearing 712 is provided at the top of the spring 711, and a locking hole is provided at the opening of the groove to prevent the ball bearing 712 from falling out. A positioning block 713 is provided on one side of the top surface of the base plate 71. A vertical rod 72 is provided on the side wall of the base plate 71, and a semi-circular ring 73 is provided at the top of the vertical rod 72.

[0023] A turntable 8 is fixedly installed on the hollow drive shaft 5 above the water tank 1. An automatic winder 81 is installed on the turntable 8 at the position corresponding to the fixed fixture 7. An inflation connecting pipe 11 is wound around the automatic winder 81. An inflation connector assembly 12 is connected to the air outlet of the inflation connecting pipe 11.

[0024] The inflation connector assembly 12 includes a quick-connect ball valve 121 connected to the inflation connector 11. The outlet end of the quick-connect ball valve 121 is connected to a pressure detection tube 122. The outlet end of the pressure detection tube 122 is provided with an inflation nozzle 124. A sealing ring 125 is fixedly provided on the outer circumference of the inflation nozzle 124. A pressure gauge 123 communicating with its internal cavity is provided on the side wall of the pressure detection tube 122.

[0025] The support platform of the bracket 3 is provided with a rotary air connector 9. The rotary air connector 9 is connected to a pipe connector 10 that supplies air to each inflation connection pipe 11. The pipe connector 10 is fixedly nested inside the upper end of the hollow drive shaft 5. The outer circumference of the pipe connector 10 is provided with air outlet pipes 101 that communicate with its internal cavity at equal intervals. The air outlet pipes 101 all pass through the hollow drive shaft 5 and are connected to their corresponding inflation connection pipes 11. The bracket 3 is also provided with an air supply pump 13 connected to the air inlet of the rotary air connector 9. The bracket 3 is also provided with a controller that controls the rotation of the reduction motor 4.

[0026] Working principle:

[0027] Water is poured into the water tank 1, and the water level in the water tank 1 is made higher than that of the turntable 6. The stator coil assembly to be tested is placed on the fixed fixture 7 located at a high position, and the bottom surface of the stator end cover 800 is made to fit against the top surface of the base plate 71, so that the positioning notch 801 on the stator end cover 800 abuts against the positioning block 713 for positioning. The shoulder 901 of the coil sleeve 900 fits against the bottom surface of the semi-circular ring 73. The ball 712 is squeezed into the groove of the base plate 71 after being squeezed by the bottom surface of the stator end cover 800. When the conical shape on the bottom surface of the stator end cover 800... After the countersunk hole 802 moves to the position of the ball bearing 712, the elastic force applied to the ball bearing 712 by the spring 711 causes it to be locked into the conical countersunk hole 802, thereby achieving the positioning and fixation of the stator coil assembly; pulling the air inlet assembly 12 corresponding to the stator coil assembly causes the air inlet 124 to be nested in the coil sleeve 900, and the air inlet 124 is sealed and fixed to the coil sleeve 900 by the sealing ring 125; air is supplied to the stator coil assembly through the air pump 13, the rotary air inlet 9, the pipe joint 10, and the air inlet connecting pipe 11. The stator coil assembly is inflated, and the internal air pressure is observed using pressure gauge 123. When the internal air pressure reaches a certain value, the quick-connect ball valve 121 is closed to stop the air supply. The geared motor 4 drives the hollow transmission shaft 5 to rotate the turntable 6. When the turntable 6 rotates, it drives the roller 63 on the lifting rod 62 to rotate along the lower part of the cam ring groove 21. At the same time, the lifting rod 62 descends along the linear bearing 61 until the stator coil assembly is submerged in water. The system observes whether air bubbles are generated when the stator coil assembly is submerged in water. This allows for the determination of whether there is air leakage or air holes. The stator coil assembly can be continuously tested for air tightness using the above method. The stator coil assembly after the air tightness test is driven to rotate by the reduction motor 4, causing the roller 63 on the lifting rod 62 to rotate along the high point of the cam ring groove 21. At the same time, the lifting rod 62 rises along the linear bearing 61 until the stator coil assembly is above the water surface. The inflation nozzle 124 is pulled out. If the inflation connector assembly 12 is not needed, the inflation connecting pipe 11 is automatically wound up by the automatic retractor 81.

[0028] The stator coil assembly airtightness testing device for the electro-hydraulic servo valve disclosed in this embodiment fixes and positions the stator coil assembly using a fixing fixture 7, seals the stator coil assembly using an air inflator assembly 12, inflates the stator coil assembly with air through an air supply pump 13, a rotary air connector 9, a pipe connector 10, and an air inflator connecting pipe 11, and observes the air pressure inside the stator coil assembly using a pressure gauge 123, rotates and lowers the stator coil assembly to immerse it in water for airtightness testing using a geared motor 4, and rotates and rises the stator coil assembly to detach it from the water surface using the geared motor 4. This device allows for continuous airtightness testing of the stator coil assembly, offering high testing efficiency and convenient airtightness testing. Furthermore, the stator coil assembly rises and falls smoothly, and there is no air bubble interference when immersed in water.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for detecting the airtightness of a stator coil assembly of an electro-hydraulic servo valve, comprising a water tank and a support provided on its side wall, the support being an inverted L-shaped plate structure, and a support platform at the top of the support being located above the water tank, characterized in that: A cylinder is fixedly installed at the bottom of the water tank. A hollow drive shaft, coaxially mounted on the cylinder, rotates on the cylinder. The top of the hollow drive shaft is rotatably connected to the support platform of the bracket via a slewing bearing. A geared motor capable of driving the hollow drive shaft is installed on the bracket. A cam ring groove is formed on the outer circumference of the cylinder. A turntable is fixedly installed on the hollow drive shaft near the cylinder. Multiple linear bearings are evenly spaced on the outer circumference of the turntable. Vertically sliding lifting rods are slidably mounted on the linear bearings. Rollers are provided at the bottom of each lifting rod. Furthermore, the rollers are all nested in the cam ring groove, and the top of the lifting rod is equipped with a fixing fixture; a turntable two is fixedly installed on the hollow transmission shaft above the water tank, and an automatic retractor is installed on the turntable two at the position corresponding to the fixing fixture. An inflation connecting pipe is wound around the automatic retractor, and the air outlet of the inflation connecting pipe is connected to an inflation connector assembly; a rotary air connector is provided on the support platform of the bracket, and the rotary joint of the rotary air connector is connected to a pipe connector that supplies air to each inflation connecting pipe, and the bracket is also equipped with an air supply pump connected to the air inlet of the rotary air connector.

2. The device for detecting the airtightness of the stator coil assembly of an electro-hydraulic servo valve according to claim 1, characterized in that: The fixed fixture includes a base plate fixedly connected to the lifting rod. A groove is provided at the center of the top surface of the base plate, a spring is nested in the groove, a ball is provided at the top of the spring, and a locking hole is provided at the opening of the groove to prevent the ball from falling out. A positioning block is provided on one side of the top surface of the base plate. A vertical rod is provided on the side wall of the base plate, and a semi-circular ring is provided at the top of the vertical rod.

3. The device for detecting the airtightness of the stator coil assembly of an electro-hydraulic servo valve according to claim 1, characterized in that: The pipe joint is fixedly nested inside the upper end of the hollow drive shaft. The outer circumference of the pipe joint is provided with air outlet pipes that communicate with its internal cavity at equal intervals. All air outlet pipes pass through the hollow drive shaft and are connected to their corresponding air inflating pipes.

4. The device for detecting the airtightness of the stator coil assembly of an electro-hydraulic servo valve according to claim 1, characterized in that: The inflation connector assembly includes a quick-connect ball valve connected to the inflation connector pipe. The outlet end of the quick-connect ball valve is connected to a pressure detection pipe. The outlet end of the pressure detection pipe is provided with an inflation nozzle. A sealing ring is fixedly provided on the outer circumference of the inflation nozzle. A pressure gauge is provided on the side wall of the pressure detection pipe, which is connected to its internal cavity.

5. The airtightness testing device for the stator coil assembly of an electro-hydraulic servo valve according to claim 1, characterized in that: A drive gear is fixedly mounted on the shaft of the geared motor, and a driven gear is mounted on the upper end of the outer circumference of the hollow transmission shaft, with the drive gear and the driven gear meshing with each other.

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