A device for detecting air tightness of end cover of swing oil cylinder

Abstract

The present invention relates to the technical field of air tightness detection, and specifically to an air tightness detection device for an end cover of a swing oil cylinder, comprising a detection frame, a rotating table is rotatably installed at the bottom of the detection frame, a fixed barrel for installing the end cover is fixedly installed on the rotating table, a support shaft is rotatably installed inside the fixed barrel; a separation cylinder is arranged inside the fixed barrel; a detection component, the detection component comprises a first connecting tube, a second connecting tube and a sliding tube, the other ends of the first connecting tube and the second connecting tube are respectively connected to the upper and lower ends of the sliding tube, a sliding piston is slidably arranged inside the sliding tube, and an extension rod is arranged on the sliding piston. In the present invention, by arranging a separation cylinder inside the fixed barrel, the inner and outer sealing parts of the end cover of the swing oil cylinder are separated, and a first detection space and a second detection space are respectively formed, and air pressure detection is performed on the first detection space and the second detection space respectively, so that the air tightness detection of the end cover of the swing oil cylinder is more efficient and quick.

Description

Technical Field

[0001] The invention relates to the technical field of air tightness detection, and in particular to an air tightness detection device for an end cover of a swing oil cylinder. Background Art

[0002] The air tightness test of the swing cylinder is an important part to ensure its sealing performance, which is crucial to the normal operation and service life of the cylinder; the direct pressure test method is a way to test the air tightness of the swing cylinder;

[0003] Usually, when testing the air tightness of the end cover of the swing cylinder, it is necessary to first plug the opening in the middle of the swing cylinder, and put the swing cylinder into a barreled test tank to test the overall air tightness of the end cover of the swing cylinder. After the air pressure leakage inside the test tank is detected, the air tightness of the inner and outer sealing parts is tested separately to find the exact location of the leakage. This testing method has complicated steps and low testing efficiency. Summary of the invention

[0004] Technical issues solved

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides an air tightness detection device for an end cover of a swing cylinder, which can effectively solve the problem that in the prior art, the overall air tightness of the end cover of the swing cylinder is first detected, and after the air pressure leakage inside the detection groove is detected, the air tightness of the inner and outer sealing parts are respectively detected to find the exact location of the leakage. This detection method has complicated steps and low detection efficiency.

[0006] Technical Solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] The present invention provides an air tightness detection device for an end cover of a swing oil cylinder, comprising a detection frame, a rotating platform rotatably mounted at the bottom of the detection frame, a fixed barrel for mounting the end cover fixedly mounted on the rotating platform, a support shaft passing through the middle of the end cover rotatably mounted inside the fixed barrel; a separation barrel is arranged inside the fixed barrel, and the separation barrel is used to separate the inside of the fixed barrel into a first detection space and a second detection space;

[0009] A detection component is fixedly installed on the side of the fixed barrel, and the detection component includes a first connecting tube, a second connecting tube and a sliding cylinder. One end of the first connecting tube and the second connecting tube are respectively connected to the first detection space and the second detection space, and the other ends of the first connecting tube and the second connecting tube are respectively connected to the upper and lower ends of the sliding cylinder. A sliding piston is slidably arranged inside the sliding cylinder, and an extension rod displaying the position of the sliding piston is arranged on the sliding piston.

[0010] Furthermore, a lifting rod is fixedly mounted on the upper end of the detection frame, a lifting frame is fixedly mounted above the lifting rod, the lifting frame extends above the support shaft, and a sleeve for being sleeved above the support shaft is fixedly mounted on the lifting frame.

[0011] Furthermore, a limiting ring is arranged below the sleeve, a hydraulic rod is fixedly mounted on the outer side of the sleeve, the limiting ring is fixedly mounted on the telescopic end of the hydraulic rod, and the hydraulic rod is used to drive the limiting ring to abut against the top of the end cover.

[0012] Furthermore, a plurality of telescopic rods are fixedly mounted on the rotating table, the upper portions of the plurality of telescopic rods extend into the interior of the fixed barrel and are fixedly connected to the lower portion of the separation barrel, and the plurality of telescopic rods are used to drive the separation barrel to move upward so that the end cover slides out of the interior of the fixed barrel.

[0013] Furthermore, two sealing rings are fixedly arranged inside the fixed barrel, and the two sealing rings are respectively tightly attached to the inner and outer walls of the separation barrel.

[0014] Furthermore, the lower end surface of the fixed barrel is respectively provided with a first air inlet hole and a second air inlet hole, the first air inlet hole and the second air inlet hole are respectively connected to the interior of the first detection space and the second detection space, and the first air inlet hole and the second air inlet hole are used to fill gas into the interior of the first detection space and the second detection space.

[0015] Furthermore, the first connecting tube and the second connecting tube are both provided with electromagnetic valves, a guide rod is fixedly installed inside the sliding cylinder, the middle part of the guide rod passes through the sliding piston and is slidably connected to the sliding piston, and return springs are provided above and below the sliding piston, and the return springs are used to drive the sliding piston to move to the middle position of the sliding cylinder.

[0016] Furthermore, the upper end of the extending rod extends out of the sliding cylinder, a knocking assembly is fixedly installed on the upper end of the extending rod, and a sounding assembly is fixedly installed on the side of the fixed barrel. When the extending rod moves up and down, the knocking assembly knocks the sounding assembly to issue an early warning.

[0017] Furthermore, the sound-generating component includes a fixed plate fixedly mounted on a fixed barrel, a first vibration plate is provided on the fixed plate tilted downward toward one side of the knocking component, a second vibration plate is integrally formed below the first vibration plate, the first vibration plate and the second vibration plate are horizontally symmetrically arranged, the length of the second vibration plate is greater than that of the first vibration plate, and the first vibration plate and the second vibration plate are provided in multiple groups.

[0018] Furthermore, the knocking assembly includes a bent rod fixedly mounted on the top of the extending rod, a metal ball is fixedly mounted on one end of the bent rod facing the sound-generating assembly, and the metal ball extends between the first vibration plate and the second vibration plate.

[0019] Beneficial Effects

[0020] Compared with the known public technology, the technical solution provided by the present invention has the following beneficial effects:

[0021] 1. In the present invention, a separation cylinder is arranged inside the fixed barrel to separate the inner and outer sealing parts of the end cover of the swing cylinder to form a first detection space and a second detection space respectively. During the detection process, the first detection space and the second detection space are filled with gas of the same pressure respectively. When the sealing parts in the first detection space or the second detection space leak, the internal air pressure of the first detection space or the second detection space will be reduced. At this time, the sliding piston will slide to the side with lower air pressure. By judging the extension length of the extension rod, it can be clearly understood which part of the sealing parts leaks, which can reduce the steps of the swing cylinder air tightness detection and improve the detection efficiency.

[0022] 2. In the present invention, by arranging a telescopic rod on the rotating table that can drive the separation cylinder to move up and down, after the detection is completed, the telescopic rod can be controlled to extend upward to drive the separation cylinder to move upward and push the end cover out of the fixed barrel.

[0023] 3. In the present invention, by fixing a guide rod inside the sliding cylinder, the upward and downward sliding of the sliding piston can be conveniently guided. By arranging return springs at the upper and lower positions of the sliding piston, the sliding piston can automatically return to the middle position of the sliding cylinder when the pressure in the space above and below the sliding piston is the same.

[0024] 4. In the present invention, a knocking assembly is arranged at the upper end of the extending rod, and a sounding assembly is arranged on the side of the fixed barrel. When the extending rod moves up and down, the knocking assembly can be conveniently driven to knock the sounding assembly. By knowing whether the sounding assembly makes a sound, it is convenient to judge whether there is a gas leakage in the first detection space and the second detection space, thereby achieving the purpose of detecting the air tightness of the end cover of the swing cylinder.

[0025] 5. In the present invention, an integrally formed first vibration plate and a second vibration plate are arranged on the side of the fixed plate. When the extending rod moves upward, the striking assembly is driven to strike the second vibration plate to produce a sound. When the extending rod moves downward, the striking assembly is driven to strike the first vibration plate to produce another sound. The two sounds represent two different signals, which makes it convenient for the staff to judge at which position the gas leakage occurs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is an exploded view of the overall structure of the present invention;

[0029] Figure 3 It is a schematic diagram of the overall structure of the rotating platform of the present invention;

[0030] Figure 4 It is a schematic diagram of the internal structure of the rotating table of the present invention;

[0031] Figure 5 It is a schematic diagram of the internal structure of the turntable of the present invention from a bottom-up perspective;

[0032] Figure 6 A schematic diagram of the overall structure of the detection assembly of the present invention;

[0033] Figure 7 Schematic diagram of the internal structure of the sliding cylinder of the present invention;

[0034] Figure 8 It is a side view of the detection component of the present invention.

[0035] The numbers in the figure represent:

[0036] 1. Detection frame; 11. Lifting rod; 12. Lifting frame; 13. Sleeve; 14. Limiting ring;

[0037] 2. Fixed barrel; 21. Support shaft; 22. Separation barrel; 23. Telescopic rod; 24. Sealing ring; 25. First air inlet; 26. Second air inlet; 3. Rotating table; 31. Support frame;

[0038] 4. Detection assembly; 41. First connecting pipe; 42. Second connecting pipe; 43. Sliding cylinder; 44. Solenoid valve; 45. Guide rod; 46. Sliding piston; 47. Return spring; 48. Extending rod; 49. Striking assembly; 491. Bending rod; 492. Metal ball;

[0039] 5. Sound generating assembly; 51. Fixed plate; 52. First vibration plate; 53. Second vibration plate;

[0040] 6. End cap. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] The present invention will be further described below in conjunction with the embodiments.

[0043] When the swing cylinder end cover air tightness detection device is used, since the swing cylinder end cover includes inner and outer sealing parts, when detecting the air tightness of the swing cylinder end cover, it is necessary to first detect the overall air tightness of the swing cylinder end cover. After the leakage is detected, the air tightness of the inner and outer sealing parts are detected separately to find the exact location of the leakage.

[0044] To this end, an embodiment of the present invention provides an air tightness detection device for an end cover of a swing cylinder, the purpose of which is at least to separate the inner and outer sealing parts of the end cover of the swing cylinder to form a first detection space and a second detection space respectively, and to detect when a leakage occurs, so that the air pressure inside the first detection space or the second detection space squeezes the sliding piston 46 to slide to the side with lower air pressure, and the detection personnel can visually judge the leakage location from the extension and retraction of the extension rod 48, and drive the metal ball 492 to knock on the first vibration plate 52 or the second vibration plate 53 to judge the leakage location by hearing, thereby reducing the detection steps and improving the air tightness detection efficiency of the swing cylinder.

[0045] Embodiment: A device for detecting air tightness of a swing cylinder end cover, such as Figure 1-Figure 7 As shown, it comprises a detection frame 1, a rotating table 3 is rotatably mounted at the bottom of the detection frame 1, a fixed barrel 2 for mounting an end cover 6 is fixedly mounted on the rotating table 3, a support shaft 21 passing through the middle of the end cover 6 is rotatably mounted inside the fixed barrel 2; a separation barrel 22 is arranged inside the fixed barrel 2, and the separation barrel 22 is used to separate the inside of the fixed barrel 2 into a first detection space and a second detection space;

[0046] The detection component 4 is fixedly installed on the side of the fixed barrel 2, and the detection component 4 includes a first connecting tube 41, a second connecting tube 42 and a sliding cylinder 43. One ends of the first connecting tube 41 and the second connecting tube 42 are respectively connected to the first detection space and the second detection space, and the other ends of the first connecting tube 41 and the second connecting tube 42 are respectively connected to the upper and lower ends of the sliding cylinder 43. A sliding piston 46 is slidably arranged inside the sliding cylinder 43, and an extension rod 48 for displaying the position of the sliding piston 46 is arranged on the sliding piston 46.

[0047] In the present invention, a separation cylinder 22 is provided inside the fixed barrel 2 to separate the inner and outer sealing parts of the end cover of the swing cylinder to form a first detection space and a second detection space respectively. During the detection process, gases of the same pressure are respectively filled into the first detection space and the second detection space. When the sealing parts in the first detection space or the second detection space leak, the internal air pressure of the first detection space or the second detection space will be reduced. At this time, the sliding piston 46 will slide to the side with lower air pressure. By judging the extension length of the extension rod 48, it can be clearly understood which part of the sealing parts leaks, which can reduce the steps of the swing cylinder air tightness detection and improve the detection efficiency.

[0048] It should be noted that a pressure gauge for detecting the pressure inside the first detection space and the second detection space is also provided at the bottom of the fixed barrel 2, so as to facilitate data comparison when abnormalities are found in the detection results.

[0049] Furthermore, if Figure 2 As shown, a lifting rod 11 is fixedly installed on the upper end of the detection frame 1, and a lifting frame 12 is fixedly installed above the lifting rod 11. The lifting frame 12 extends above the support shaft 21, and a sleeve 13 for being sleeved above the support shaft 21 is fixedly installed on the lifting frame 12.

[0050] Among them, by arranging a lifting rod 11 above the detection frame 1, and arranging a lifting frame 12 on the lifting rod 11, after the end cover 6 is placed into the fixed barrel 2, the lifting rod 11 is driven to retract, so as to drive the sleeve 13 on the lifting frame 12 to be mounted on the top of the support shaft 21, and then the lifting rod 11 is continued to be retracted. The use of the side of the support shaft 21 under pressure can be simulated during the detection process, and whether the air tightness of the end cover 6 is good in this case can be detected.

[0051] Furthermore, if Figure 2 As shown, a limiting ring 14 is provided below the sleeve 13 , a hydraulic rod is fixedly mounted on the outer side of the sleeve 13 , the limiting ring 14 is fixedly mounted on the telescopic end of the hydraulic rod, and the hydraulic rod is used to drive the limiting ring 14 to abut against the end cover 6 .

[0052] Among them, by setting a limit ring 14 below the sleeve 13 and controlling the height of the limit ring 14 by setting a hydraulic rod, the limit ring 14 can be conveniently placed above the end cover 6, which can prevent the end cover 6 from being pushed out of the fixed barrel 2 when high-pressure gas is filled into the fixed barrel 2, and can stabilize the position of the end cover 6 inside the fixed barrel 2.

[0053] Furthermore, if Figure 3 , Figure 4As shown, a plurality of telescopic rods 23 are fixedly mounted on the rotating table 3, and the upper parts of the plurality of telescopic rods 23 extend into the interior of the fixed barrel 2 and are fixedly connected to the lower part of the separation barrel 22, and the plurality of telescopic rods 23 are used to drive the separation barrel 22 to move upward so that the end cover 6 slides out of the interior of the fixed barrel 2.

[0054] Among them, by arranging a telescopic rod 23 on the rotating table 3 that can drive the separation cylinder 22 to move up and down, it is convenient to control the telescopic rod 23 to extend upward after the detection is completed, thereby driving the separation cylinder 22 to move upward and pushing the end cover 6 out of the fixed barrel 2.

[0055] In addition, a support frame 31 is provided on the rotating table 3 for supporting and installing the fixed barrel 2. When the air tightness of the end cover 6 is tested, the load direction of the lifting frame 12 acting on the end cover 6 can be changed by adjusting the rotation angle of the rotating table 3, and the air tightness of the end cover 6 can be simulated and tested under different angle loads.

[0056] Furthermore, if Figure 4 , Figure 5 As shown, two sealing rings 24 are fixedly arranged inside the fixed barrel 2 , and the two sealing rings 24 are respectively tightly attached to the inner and outer walls of the separation barrel 22 .

[0057] Furthermore, if Figure 4 , Figure 5 As shown, the lower end surface of the fixed barrel 2 is respectively provided with a first air inlet hole 25 and a second air inlet hole 26, and the first air inlet hole 25 and the second air inlet hole 26 are respectively connected to the interior of the first detection space and the second detection space, and the first air inlet hole 25 and the second air inlet hole 26 are used to fill gas into the interior of the first detection space and the second detection space.

[0058] Among them, by arranging the first air inlet hole 25 and the second air inlet hole 26 on the fixed barrel 2, high-pressure gas can be conveniently filled into the first detection space and the second detection space respectively, so as to conveniently detect the air tightness inside the first detection space and the second detection space.

[0059] Furthermore, if Figure 6 , Figure 7 As shown, the first connecting tube 41 and the second connecting tube 42 are both provided with an electromagnetic valve 44, a guide rod 45 is fixedly installed inside the sliding cylinder 43, the middle part of the guide rod 45 passes through the sliding piston 46 and is slidably connected to the sliding piston 46, and a return spring 47 is provided above and below the sliding piston 46, and the return spring 47 is used to drive the sliding piston 46 to move to the middle position of the sliding cylinder 43.

[0060] Among them, by fixing the guide rod 45 inside the sliding cylinder 43, the up and down sliding of the sliding piston 46 can be conveniently guided. By arranging the return spring 47 at the upper and lower positions of the sliding piston 46, the sliding piston 46 can automatically return to the middle position of the sliding cylinder 43 when the pressure of the space above and below the sliding piston 46 is the same.

[0061] Furthermore, if Figure 6 , Figure 7 As shown, the upper end of the extending rod 48 extends out of the sliding cylinder 43, and a knocking component 49 is fixedly installed on the upper end of the extending rod 48. A sounding component 5 is fixedly installed on the side of the fixed barrel 2. When the extending rod 48 moves up and down, the knocking component 49 knocks on the sounding component 5 to issue an early warning.

[0062] Among them, by setting a knocking component 49 at the upper end of the extending rod 48 and setting a sound-generating component 5 on the side of the fixed barrel 2, when the extending rod 48 moves up and down, the knocking component 49 can be conveniently driven to knock the sound-generating component 5. By knowing whether the sound-generating component 5 makes a sound, it is convenient to judge whether there is a gas leakage in the first detection space and the second detection space, thereby achieving the purpose of detecting the air tightness of the swing cylinder end cover.

[0063] Furthermore, if Figure 7 , Figure 8 As shown, the sound-generating component 5 includes a fixed plate 51 fixedly mounted on the fixed barrel 2, and a first vibration plate 52 is provided on the fixed plate 51 tilted downward toward one side of the knocking component 49, and a second vibration plate 53 is integrally formed below the first vibration plate 52, the first vibration plate 52 and the second vibration plate 53 are horizontally symmetrically arranged, the length of the second vibration plate 53 is greater than that of the first vibration plate 52, and the first vibration plate 52 and the second vibration plate 53 are provided in multiple groups.

[0064] Among them, by arranging an integrally formed first vibration plate 52 and a second vibration plate 53 on the side of the fixed plate 51, when the extending rod 48 moves upward, the knocking component 49 is driven to knock on the second vibration plate 53 to produce a sound, and when the extending rod 48 moves downward, the knocking component 49 is driven to knock on the first vibration plate 52 to produce another sound. The two sounds represent two different signals, which makes it convenient for staff to determine where the gas leakage occurs.

[0065] It should be noted that in actual use, the first vibration plate 52 and the second vibration plate 53 can be made of different metal materials, so that the sound difference between the first vibration plate 52 and the second vibration plate 53 when struck is greater, making it easier for staff to identify different signals.

[0066] Furthermore, if Figure 8As shown, the knocking assembly 49 includes a bent rod 491 fixedly mounted on the top of the extending rod 48, and a metal ball 492 is fixedly mounted on one end of the bent rod 491 facing the sound-generating assembly 5, and the metal ball 492 extends between the first vibration plate 52 and the second vibration plate 53.

[0067] Among them, by setting a bending rod 491 to install the metal ball 492, the bending rod 491 can be bent appropriately when moving up and down, so that the metal ball 492 first slides on the upper group of first vibration plates 52 or second vibration plates 53, and then releases the elastic potential energy accumulated on the bending rod 491 after sliding up and down to a certain position, so that the metal ball 492 can have more force when hitting the first vibration plate 52 or the second vibration plate 53, and the sound produced is louder.

[0068] Working principle: During detection, the end cover 6 is first mounted on the outside of the support shaft 21, and the lifting frame 12 is used to squeeze the end cover 6 into the interior of the fixed barrel 2, and then an external pressurizing device is used to fill the first detection space and the second detection space with high-pressure gas of the same pressure, and then the electromagnetic valve 44 is opened to connect the internal spaces of the first detection space and the second detection space with the upper and lower ends of the sliding cylinder 43, respectively. When the air pressure inside the first detection space or the second detection space is reduced due to leakage, the sliding piston 46 inside the sliding cylinder 43 will slide toward the end with lower pressure, and simultaneously drive the metal ball 492 of the knocking assembly 49 to knock on the first vibration plate 52 or the second vibration plate 53. The first vibration plate 52 and the second vibration plate 53 emit different sounds to determine whether the internal gas of the first detection space or the second detection space is leaking, thereby achieving the purpose of simultaneously detecting the internal sealing parts and external airtight parts of the end cover 6.

[0069] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for detecting air tightness of an end cover of a swing cylinder, characterized in that: include: A detection frame (1), wherein a rotating platform (3) is rotatably mounted at the bottom of the detection frame (1), a fixed barrel (2) for mounting an end cover (6) is fixedly mounted on the rotating platform (3), a support shaft (21) passing through the middle of the end cover (6) is rotatably mounted inside the fixed barrel (2); a separation barrel (22) is arranged inside the fixed barrel (2), and the separation barrel (22) is used to separate the inside of the fixed barrel (2) into a first detection space and a second detection space; A detection assembly (4), the detection assembly (4) being fixedly mounted on a side of the fixed barrel (2), the detection assembly (4) comprising a first connecting tube (41), a second connecting tube (42) and a sliding cylinder (43), one end of the first connecting tube (41) and the second connecting tube (42) being respectively connected to a first detection space and a second detection space, the other end of the first connecting tube (41) and the second connecting tube (42) being respectively connected to upper and lower ends of the sliding cylinder (43), a sliding piston (46) being slidably disposed inside the sliding cylinder (43), and a protruding rod (48) for displaying the position of the sliding piston (46) being disposed on the sliding piston (46).

2. The air tightness detection device for the end cover of a swing cylinder according to claim 1, characterized in that: A lifting rod (11) is fixedly mounted on the upper end of the detection frame (1), a lifting frame (12) is fixedly mounted above the lifting rod (11), the lifting frame (12) extends above the support shaft (21), and a sleeve (13) for being sleeved above the support shaft (21) is fixedly mounted on the lifting frame (12).

3. The air tightness detection device for the end cover of a swing cylinder according to claim 2, characterized in that: A limiting ring (14) is arranged below the sleeve (13), a hydraulic rod is fixedly mounted on the outside of the sleeve (13), the limiting ring (14) is fixedly mounted on the telescopic end of the hydraulic rod, and the hydraulic rod is used to drive the limiting ring (14) to abut against the top of the end cover (6).

4. The air tightness detection device for the end cover of a swing cylinder according to claim 1, characterized in that: A plurality of telescopic rods (23) are fixedly mounted on the rotating table (3); the upper portions of the plurality of telescopic rods (23) extend into the interior of the fixed barrel (2) and are fixedly connected to the lower portion of the separation barrel (22); the plurality of telescopic rods (23) are used to drive the separation barrel (22) to move upward, so that the end cover (6) slides out of the interior of the fixed barrel (2).

5. The air tightness detection device for the end cover of a swing cylinder according to claim 1, characterized in that: Two sealing rings (24) are fixedly arranged inside the fixed barrel (2), and the two sealing rings (24) are respectively tightly attached to the inner and outer walls of the separation barrel (22).

6. The air tightness detection device for the end cover of a swing oil cylinder according to claim 1, characterized in that: The lower end surface of the fixed barrel (2) is respectively provided with a first air inlet hole (25) and a second air inlet hole (26), the first air inlet hole (25) and the second air inlet hole (26) are respectively connected to the inside of the first detection space and the second detection space, and the first air inlet hole (25) and the second air inlet hole (26) are used to fill gas into the first detection space and the second detection space.

7. The air tightness detection device for the end cover of a swing cylinder according to claim 1, characterized in that: The first connecting pipe (41) and the second connecting pipe (42) are both provided with an electromagnetic valve (44); a guide rod (45) is fixedly installed inside the sliding cylinder (43); the middle part of the guide rod (45) passes through the sliding piston (46) and is slidably connected to the sliding piston (46); and return springs (47) are provided above and below the sliding piston (46); the return springs (47) are used to drive the sliding piston (46) to move to the middle position of the sliding cylinder (43).

8. The air tightness detection device for the end cover of a swing oil cylinder according to claim 1, characterized in that: The upper end of the extending rod (48) extends out of the sliding cylinder (43), a knocking assembly (49) is fixedly mounted on the upper end of the extending rod (48), and a sounding assembly (5) is fixedly mounted on the side of the fixed barrel (2), and when the extending rod (48) moves up and down, the knocking assembly (49) knocks on the sounding assembly (5) to issue an early warning.

9. The air tightness detection device for the end cover of a swing oil cylinder according to claim 8, characterized in that: The sound-generating component (5) comprises a fixed plate (51) fixedly mounted on a fixed barrel (2); a first vibration plate (52) is arranged on a side of the fixed plate (51) tilted downwardly toward the knocking component (49); a second vibration plate (53) is integrally formed below the first vibration plate (52); the first vibration plate (52) and the second vibration plate (53) are arranged horizontally symmetrically; the length of the second vibration plate (53) is greater than that of the first vibration plate (52); and a plurality of groups of the first vibration plate (52) and the second vibration plate (53) are arranged.

10. The air tightness detection device for the end cover of a swing cylinder according to claim 8 or 9, characterized in that: The knocking assembly (49) comprises a bent rod (491) fixedly mounted on the top of the extending rod (48); a metal ball (492) is fixedly mounted on one end of the bent rod (491) facing the sound-generating assembly (5); and the metal ball (492) extends between the first vibration plate (52) and the second vibration plate (53).

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