Sealing performance detection equipment for hydraulic motor shell

Abstract

The utility model discloses a sealing performance detection device for a hydraulic motor housing, which comprises a fixed bottom plate, at least one vacuum pump and at least two pressure detection mechanisms, a vertical sealing mechanism, a plurality of lateral sealing mechanisms and a positioning jig are arranged on the fixed bottom plate, and the positioning jig comprises a positioning bottom plate, a lower sealing plate and an upper sealing plate. The positioning bottom plate is fixedly installed on the fixing bottom plate, the lower sealing plate is formed on the upper portion of the positioning bottom plate, the upper sealing plate is formed on the upper portion of the lower sealing plate, the positioning jig is provided with a first air exhaust channel and a second air exhaust channel, the first end of the first air exhaust channel extends to the upper sealing plate, and the second end of the first air exhaust channel extends to the side face of the positioning bottom plate. The first end of the second exhaust channel extends to the lower sealing plate, and the second end extends to the side face of the positioning bottom plate. Detection is carried out in different chambers, the position of a leakage point is conveniently judged, detection accuracy is improved, reliability and stability are improved, the structure is simple, and cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic motors, in particular to a sealing detection device for a hydraulic motor housing. Background Art

[0002] A hydraulic motor is an actuator of a hydraulic system, which converts the hydraulic pressure energy provided by a hydraulic pump into the mechanical energy of its output shaft. Liquid is the medium for transmitting force and motion. When in use, liquid needs to be injected into the hydraulic motor housing. The sealing performance of the hydraulic motor housing is particularly important. Therefore, during production, it is necessary to detect the sealing performance of the hydraulic motor housing.

[0003] However, since there are steps on the sealing surface of the hydraulic motor housing, the inner cavity of the hydraulic motor housing is divided into an upper cavity and a lower cavity with unequal diameters. The traditional sealing detection device seals the periphery of the hydraulic motor housing and inflates the upper cavity or the lower cavity to detect the sealing performance. When inflating, the upper cavity and the lower cavity are in a connected state. Once a sealing problem is found, it is difficult to determine whether the leak point is in the upper cavity or the lower cavity. Moreover, when inflating, the peripheral seal will be pushed out, resulting in air leakage of the peripheral seal and affecting the detection result. The detection accuracy is low, and a pressing device with a greater driving force often needs to be used to press the peripheral seal, with a complex structure and high cost. Therefore, it is necessary to make improvements. Summary of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a sealing detection device for a hydraulic motor housing, which can detect in separate chambers, facilitating the determination of the leak point position, improving the detection accuracy, reliability and stability, with a simple structure and low cost.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is: a sealing detection device for a hydraulic motor housing, including a fixed bottom plate, at least one vacuum pump and at least two pressure detection mechanisms. A vertical sealing mechanism, a plurality of lateral sealing mechanisms and a positioning fixture are arranged on the fixed bottom plate. The vertical sealing mechanism is arranged above the positioning fixture, and each lateral sealing mechanism is respectively arranged on the periphery of the positioning fixture. The positioning fixture includes a positioning bottom plate, a lower sealing plate and an upper sealing plate. The positioning bottom plate is fixedly installed on the fixed bottom plate. The lower sealing plate is formed on the upper part of the positioning bottom plate, and the upper sealing plate is formed on the upper part of the lower sealing plate. A first sealing gasket is arranged between the upper sealing plate and the lower sealing plate, and a second sealing gasket is arranged between the lower sealing plate and the positioning bottom plate. The positioning fixture is provided with a first air extraction channel and a second air extraction channel. The first end of the first air extraction channel extends to the upper sealing plate, and the second end extends to the side surface of the positioning bottom plate. The first end of the second air extraction channel extends to the lower sealing plate, and the second end extends to the side surface of the positioning bottom plate. The second ends of the first air extraction channel and the second air extraction channel are respectively connected to two pressure detection mechanisms, and the two pressure detection mechanisms are respectively connected to the vacuum pump.

[0006] In a further technical solution, the first air extraction channel includes a first vacuum hole and a first vacuum connection hole. The first vacuum connection hole is horizontally formed inside the positioning bottom plate. The first vacuum connection hole vertically penetrates through the upper sealing plate and the lower sealing plate. The lower end portion of the first vacuum connection hole is connected to the inner end portion of the first vacuum connection hole. The outer end portion of the first vacuum connection hole is connected to the pressure detection mechanism.

[0007] The second air extraction channel includes a second vacuum hole and a second vacuum connection hole. The second vacuum connection hole is horizontally formed inside the positioning bottom plate. The second vacuum connection hole vertically penetrates through the lower sealing plate. The lower end portion of the second vacuum connection hole is connected to the inner end portion of the second vacuum connection hole. The outer end portion of the second vacuum connection hole is connected to another pressure detection mechanism.

[0008] In a further technical solution, the vertical sealing mechanism includes a vertical fixing frame, a vertical driving assembly, a vertical sliding plate and a vertical sealing member. The vertical fixing frame is fixedly installed on the fixed bottom plate. The vertical driving assembly is fixedly installed on the vertical fixing frame. The vertical sliding plate is slidably installed up and down on the vertical fixing frame. The vertical driving assembly is in transmission connection with the vertical sliding plate. The vertical sealing member is fixedly installed at the lower part of the vertical sliding plate and is located above the positioning jig.

[0009] In a further technical solution, the vertical driving assembly includes a vertical driving cylinder. The vertical driving cylinder is fixedly installed on the vertical fixing frame. The piston rod of the vertical driving cylinder is fixedly connected to the vertical sliding plate. Two guide rods are vertically arranged on the vertical fixing frame. The vertical sliding plate is slidably installed on the two guide rods.

[0010] The vertical sealing member includes a third sealing gasket and a plurality of elastic sealing components. Each elastic sealing component is arranged at the lower part of the vertical sliding plate. The third sealing gasket is arranged between each elastic sealing component and the vertical sliding plate.

[0011] In a further technical solution, the elastic sealing component includes a fixing screw, a silica gel sealing sleeve and a return spring. A threaded hole is arranged at the lower part of the vertical sliding plate. The upper part of the fixing screw passes through the third sealing gasket and is in threaded connection with the threaded hole. A sliding sleeve is embedded inside the silica gel sealing sleeve. The sliding sleeve is slidably installed on the fixing screw. The lower end portion of the sliding sleeve is in limit fit with the lower end portion of the fixing screw. A washer is sleeved on the upper part of the sliding sleeve. The return spring is sleeved on the sliding sleeve. The upper end portion of the return spring abuts against the third sealing gasket, and the lower end portion abuts against the washer.

[0012] In a further technical solution, the outer diameter of the upper part of the silica gel sealing sleeve is larger than that of the lower part, and a vertical sealing step is formed in the middle.

[0013] In a further technical solution, the lateral sealing mechanism includes a lateral fixing frame, a lateral driving cylinder, and a lateral sealing column. The lateral fixing frame is fixedly installed on the fixed bottom plate, the lateral driving cylinder is fixedly installed on the lateral fixing frame, and the outer end of the lateral sealing column is fixedly installed on the piston rod of the lateral driving cylinder.

[0014] In a further technical solution, the lateral sealing column is a lateral sealing column made of soft rubber, and a sealing convex portion is provided at the inner end of the lateral sealing column.

[0015] In a further technical solution, the positioning bottom plate extends upward to form a plurality of positioning columns, and each positioning column is respectively arranged on the periphery of the lower sealing plate.

[0016] In a further technical solution, the sealing performance detection device is also provided with a control device, and the control device is electrically connected to the vacuum pump and each pressure detection mechanism respectively.

[0017] After adopting the above structure, the advantages of the present utility model compared with the prior art are as follows: The upper cavity of the hydraulic motor housing is sealed by the upper sealing plate and the first sealing gasket, and the lower cavity of the hydraulic motor housing is sealed by the lower sealing plate and the second sealing gasket, so that the upper cavity and the lower cavity of the hydraulic motor housing are relatively partitioned and sealed to achieve chamber-by-chamber detection, which is convenient for judging the leakage point position; The upper cavity and the lower cavity of the hydraulic motor housing are respectively evacuated through the first air extraction channel and the second air extraction channel, and two pressure detection mechanisms respectively detect the vacuum degree of the upper cavity and the lower cavity of the hydraulic motor housing and generate a vacuum degree change curve, so as to judge whether there is leakage; When evacuating, due to the influence of the pressure difference, the vertical sealing mechanism and the lateral sealing mechanism for sealing the side openings of the hydraulic motor housing can be more closely attached to seal the hydraulic motor housing, improving the sealing performance, improving the detection accuracy, improving the reliability and stability, without the need for a large pressing force, simplifying the structure, and reducing the cost. Description of the Drawings

[0018] The following further illustrates the present utility model in conjunction with the drawings and embodiments.

[0019] Figure 1 is a schematic structural diagram of the present utility model;

[0020] Figure 2 is the Figure 1 enlarged view of part A of the present utility model;

[0021] Figure 3 is a working state diagram of the present utility model during detection;

[0022] Figure 4 is a schematic structural diagram of the positioning fixture of the present utility model;

[0023] Figure 5 is a cross-sectional view of the elastic sealing assembly of the present utility model.

[0024] In the figure:

[0025] 1 Fixed bottom plate;

[0026] 2 Vacuum pump;

[0027] 3 Pressure detection mechanism;

[0028] 4 Vertical sealing mechanism, 41 Vertical driving cylinder, 42 Vertical fixing frame, 421 Guide rod, 43 Vertical sliding plate, 44 Elastic sealing component, 441 Fixed screw, 442 Silicone sealing sleeve, 443 Return spring, 444 Sliding sleeve, 445 Washer, 446 Vertical sealing step, 45 Third sealing gasket;

[0029] 5 Lateral sealing mechanism, 51 Lateral fixing frame, 52 Lateral driving cylinder, 53 Lateral sealing column, 531 Sealing convex part;

[0030] 61 Positioning bottom plate, 611 Positioning column, 62 Upper sealing plate, 63 Lower sealing plate, 64 First sealing gasket, 65 Second sealing gasket, 66 First air extraction channel, 661 First vacuum hole, 662 First vacuum connection hole, 67 Second air extraction channel, 671 Second vacuum hole, 672 Second vacuum connection hole. Specific embodiments

[0031] The following are only the preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly.

[0032] A sealing detection device for a hydraulic motor housing, as Figures 1 to 5As shown in the figure, it includes a fixed bottom plate 1, at least one vacuum pump 2 and at least two pressure detection mechanisms 3. A vertical sealing mechanism 4, a plurality of lateral sealing mechanisms 5 and a positioning fixture are arranged on the fixed bottom plate 1. The vertical sealing mechanism 4 is arranged above the positioning fixture, and each lateral sealing mechanism 5 is respectively arranged on the periphery of the positioning fixture. The positioning fixture includes a positioning bottom plate 61, a lower sealing plate 63 and an upper sealing plate 62. The positioning bottom plate 61 is fixedly installed on the fixed bottom plate 1. The lower sealing plate 63 is formed on the upper part of the positioning bottom plate 61, and the upper sealing plate 62 is formed on the upper part of the lower sealing plate 63. A first sealing gasket 64 is arranged between the upper sealing plate 62 and the lower sealing plate 63, and a second sealing gasket 65 is arranged between the lower sealing plate 63 and the positioning bottom plate 61. The positioning fixture is provided with a first air extraction channel 66 and a second air extraction channel 67. The first end of the first air extraction channel 66 extends to the upper sealing plate 62, and the second end extends to the side surface of the positioning bottom plate 61. The first end of the second air extraction channel 67 extends to the lower sealing plate 63, and the second end extends to the side surface of the positioning bottom plate 61. The second ends of the first air extraction channel 66 and the second air extraction channel 67 are respectively connected to two pressure detection mechanisms 3, and the two pressure detection mechanisms 3 are respectively connected to the vacuum pump 2. The upper cavity of the hydraulic motor housing is sealed by the upper sealing plate 62 and the first sealing gasket 64, and the lower cavity of the hydraulic motor housing is sealed by the lower sealing plate 63 and the second sealing gasket 65, so that the upper cavity and the lower cavity of the hydraulic motor housing are relatively partitioned and sealed to realize chamber-by-chamber detection, which is convenient for judging the position of the leakage point; the upper cavity and the lower cavity of the hydraulic motor housing are evacuated respectively through the first air extraction channel 66 and the second air extraction channel 67, and the two pressure detection mechanisms 3 respectively detect the vacuum degree of the upper cavity and the lower cavity of the hydraulic motor housing and generate a vacuum degree change curve, so as to judge whether there is leakage; when evacuating, due to the influence of the pressure difference, the vertical sealing mechanism 4 and the lateral sealing mechanism 5 for sealing the side holes of the hydraulic motor housing can be more closely attached to seal the hydraulic motor housing, improving the sealing performance, the detection accuracy, the reliability and the stability, without the need for a large pressing force, simplifying the structure and reducing the cost.

[0033] Specifically, the first air extraction channel 66 includes a first vacuum hole 661 and a first vacuum connection hole 662. The first vacuum connection hole 662 is horizontally formed inside the positioning base plate 61. The first vacuum connection hole 662 vertically penetrates through the upper sealing plate 62 and the lower sealing plate 63. The lower end of the first vacuum connection hole 662 is connected to the inner end of the first vacuum connection hole 662. The outer end of the first vacuum connection hole 662 is connected to the pressure detection mechanism 3. The second air extraction channel 67 includes a second vacuum hole 671 and a second vacuum connection hole 672. The second vacuum connection hole 672 is horizontally formed inside the positioning base plate 61. The second vacuum connection hole 672 vertically penetrates through the lower sealing plate 63. The lower end of the second vacuum connection hole 672 is connected to the inner end of the second vacuum connection hole 672. The outer end of the second vacuum connection hole 672 is connected to another pressure detection mechanism 3. Both the first air extraction channel 66 and the second air extraction channel 67 are arranged inside the positioning fixture, and vacuum is extracted from the opening at the bottom of the hydraulic motor housing. Under the pressure difference, the hydraulic motor housing is pressed tightly on the positioning fixture, further fixing the hydraulic motor housing while improving the sealing performance. The first vacuum hole 661 and the second vacuum hole 671 are vertical holes, and the first vacuum connection hole 662 and the second vacuum connection hole 672 are horizontal holes, so that the first air extraction channel 66 and the second air extraction channel 67 are in an "L" shape, with no bending in the straight-line distance, shortening the lengths of the first air extraction channel 66 and the second air extraction channel 67, improving the vacuum extraction speed, improving the detection efficiency, and the straight holes are convenient for processing and production, with a simple structure and low cost.

[0034] Specifically, the vertical sealing mechanism 4 includes a vertical fixing frame 42, a vertical driving assembly, a vertical sliding plate 43 and a vertical sealing member. The vertical fixing frame 42 is fixedly installed on the fixed base plate 1. The vertical driving assembly is fixedly installed on the vertical fixing frame 42. The vertical sliding plate 43 is slidably installed up and down on the vertical fixing frame 42. The vertical driving assembly is in transmission connection with the vertical sliding plate 43. The vertical sealing member is fixedly installed at the lower part of the vertical sliding plate 43 and is located above the positioning fixture. The vertical sealing mechanism 4 seals the opening on the upper side of the hydraulic motor housing and presses and fixes the hydraulic motor housing on the positioning fixture, further fixing the hydraulic motor housing.

[0035] Specifically, the vertical driving assembly includes a vertical driving cylinder 41, the vertical driving cylinder 41 is fixedly installed on a vertical fixing frame 42, the piston rod of the vertical driving cylinder 41 is fixedly connected to a vertical sliding plate 43, two guide rods 421 are vertically arranged on the vertical fixing frame 42, and the vertical sliding plate 43 is slidably installed on the two guide rods 421; the vertical seal includes a third sealing gasket 45 and a plurality of elastic seal assemblies 44, each elastic seal assembly 44 is arranged at the lower part of the vertical sliding plate 43, and the third sealing gasket 45 is arranged between each elastic seal assembly 44 and the vertical sliding plate 43. Using the vertical driving cylinder 41 to drive the vertical sliding plate 43 has a simple structure and low cost. The opening on the upper side of the hydraulic motor housing is sealed by the third sealing gasket 45, and the screw holes of the hydraulic motor housing are sealed by each elastic seal assembly 44. The separate independent sealing further improves the sealing performance.

[0036] Specifically, the elastic seal assembly 44 includes a fixing screw 441, a silica gel seal sleeve 442 and a return spring 443. A threaded hole is provided at the lower part of the vertical sliding plate 43. The upper part of the fixing screw 441 passes through the third sealing gasket 45 and is threadedly connected to the threaded hole. A sliding sleeve 444 is embedded inside the silica gel seal sleeve 442. The sliding sleeve 444 is slidably installed on the fixing screw 441. The lower end of the sliding sleeve 444 is in limit fit with the lower end of the fixing screw 441. A washer 445 is sleeved on the upper part of the sliding sleeve 444. The return spring 443 is sleeved on the sliding sleeve 444. The upper end of the return spring 443 abuts against the third sealing gasket 45, and the lower end abuts against the washer 445. The soft silica gel seal sleeve 442 is inserted into the threaded hole of the hydraulic motor housing for sealing. The silica gel seal sleeve 442 can slide up and down relative to the fixing screw 441. Before vacuum pumping, the vertical driving cylinder 41 has driven the vertical seal to press against the upper part of the hydraulic motor housing for sealing. After vacuum pumping, the hydraulic motor housing will compress the first sealing gasket 64 and the second sealing gasket 65, generating a certain downward displacement. The return spring 443 can give a downward pressing force to the silica gel seal sleeve 442 to offset the displacement generated by the hydraulic motor housing during vacuum pumping, improving the sealing reliability and stability.

[0037] Specifically, the outer diameter of the upper part of the silica gel seal sleeve 442 is larger than that of the lower part, and a vertical sealing step 446 is formed in the middle. The vertical sealing step 446 abuts against the outer end of the threaded hole of the hydraulic motor housing to form an end face seal, further improving the sealing performance.

[0038] Specifically, the lateral sealing mechanism 5 includes a lateral fixing frame 51, a lateral driving cylinder 52, and a lateral sealing column 53. The lateral fixing frame 51 is fixedly installed on the fixed bottom plate 1. The lateral driving cylinder 52 is fixedly installed on the lateral fixing frame 51. The outer end of the lateral sealing column 53 is fixedly installed on the piston rod of the lateral driving cylinder 52. The openings on the side of the hydraulic motor housing are sealed by the respective lateral sealing mechanisms 5. The lateral driving cylinder 52 is used to drive the lateral sealing column 53 to move, with a simple structure and low cost.

[0039] Specifically, the lateral sealing column 53 is made of soft rubber. A sealing protrusion 531 is provided at the inner end of the lateral sealing column 53. The sealing protrusion 531 is inserted into the opening on the side of the hydraulic motor housing, so as to perform sealing through end face sealing and plugging sealing at the same time, further improving the sealing performance.

[0040] Specifically, a plurality of positioning columns 611 extend upward from the positioning bottom plate 61, and the respective positioning columns 611 are respectively arranged around the lower sealing plate 63. The hydraulic motor housing is placed between the respective positioning columns 611, and each positioning column 611 abuts against the outer side surface of the hydraulic motor housing, so as to limit the hydraulic motor housing in the horizontal direction and facilitate loading and unloading at the same time.

[0041] Specifically, the sealing performance detection device is also provided with a control device, and the control device is electrically connected to the vacuum pump 2 and the respective pressure detection mechanisms 3. The control device controls the vacuum pump 2 and the pressure detection mechanisms 3. During detection, after the pressure detection mechanism 3 detects that the vacuum degree is constant, the control device forms a vacuum degree change curve within a preset time, so as to automatically judge whether it is qualified. If leakage occurs, it is feedback through a light or a screen whether the upper cavity or the lower cavity leaks, without the need for manual continuous observation of data changes, which is more convenient to use and improves the accuracy.

[0042] The above content is only the preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. The content of this specification should not be construed as a limitation to the present invention.

Claims

1. A sealing detection device for a hydraulic motor housing, characterized in that: It includes a fixed bottom plate (1), at least one vacuum pump (2) and at least two pressure detection mechanisms (3). A vertical sealing mechanism (4), a plurality of lateral sealing mechanisms (5) and a positioning fixture are arranged on the fixed bottom plate (1). The vertical sealing mechanism (4) is arranged above the positioning fixture, and each lateral sealing mechanism (5) is respectively arranged on the periphery of the positioning fixture. The positioning fixture includes a positioning bottom plate (61), a lower sealing plate (63) and an upper sealing plate (62). The positioning bottom plate (61) is fixedly installed on the fixed bottom plate (1). The lower sealing plate (63) is formed on the upper part of the positioning bottom plate (61). The upper sealing plate (62) is formed on the upper part of the lower sealing plate (63). A first sealing gasket (64) is arranged between the upper sealing plate (62) and the lower sealing plate (63). A second sealing gasket (65) is arranged between the lower sealing plate (63) and the positioning bottom plate (61). The positioning fixture is provided with a first air extraction channel (66) and a second air extraction channel (67). The first end of the first air extraction channel (66) extends to the upper sealing plate (62), and the second end extends to the side surface of the positioning bottom plate (61). The first end of the second air extraction channel (67) extends to the lower sealing plate (63), and the second end extends to the side surface of the positioning bottom plate (61). The second ends of the first air extraction channel (66) and the second air extraction channel (67) are respectively connected to the two pressure detection mechanisms (3), and the two pressure detection mechanisms (3) are respectively connected to the vacuum pump (2).

2. The sealing performance detection device for a hydraulic motor housing according to claim 1, wherein: The first air extraction channel (66) includes a first vacuum hole (661) and a first vacuum connection hole (662). The first vacuum connection hole (662) is horizontally opened inside the positioning bottom plate (61). The first vacuum connection hole (662) vertically penetrates through the upper sealing plate (62) and the lower sealing plate (63). The lower end part of the first vacuum connection hole (662) is connected to the inner end part of the first vacuum connection hole (662). The outer end part of the first vacuum connection hole (662) is connected to the pressure detection mechanism (3). The second air extraction channel (67) includes a second vacuum hole (671) and a second vacuum connection hole (672). The second vacuum connection hole (672) is horizontally opened inside the positioning bottom plate (61). The second vacuum connection hole (672) vertically penetrates through the lower sealing plate (63). The lower end part of the second vacuum connection hole (672) is connected to the inner end part of the second vacuum connection hole (672). The outer end part of the second vacuum connection hole (672) is connected to another pressure detection mechanism (3).

3. The sealing detection device for a hydraulic motor housing according to claim 1, wherein: The vertical sealing mechanism (4) includes a vertical fixing frame (42), a vertical driving assembly, a vertical sliding plate (43) and a vertical sealing member. The vertical fixing frame (42) is fixedly installed on the fixed bottom plate (1). The vertical driving assembly is fixedly installed on the vertical fixing frame (42). The vertical sliding plate (43) is slidably installed up and down on the vertical fixing frame (42). The vertical driving assembly is in transmission connection with the vertical sliding plate (43). The vertical sealing member is fixedly installed on the lower part of the vertical sliding plate (43) and is located above the positioning fixture.

4. A sealing detection device for a hydraulic motor housing according to claim 3, characterized in that: The vertical drive assembly includes a vertical drive cylinder (41), the vertical drive cylinder (41) is fixedly installed on a vertical fixing frame (42), the piston rod of the vertical drive cylinder (41) is fixedly connected to the vertical slide plate (43), two guide rods (421) are vertically arranged on the vertical fixing frame (42), and the vertical slide plate (43) is slidably installed on the two guide rods (421); The vertical seal includes a third sealing gasket (45) and a plurality of elastic seal assemblies (44), each elastic seal assembly (44) is arranged at the lower part of the vertical slide plate (43), and the third sealing gasket (45) is arranged between each elastic seal assembly (44) and the vertical slide plate (43).

5. The sealing detection device for a hydraulic motor housing according to claim 4, wherein: The elastic seal assembly (44) includes a fixing screw (441), a silica gel seal sleeve (442) and a return spring (443). A threaded hole is arranged at the lower part of the vertical slide plate (43). The upper part of the fixing screw (441) passes through the third sealing gasket (45) and is threadedly connected to the threaded hole. A sliding sleeve (444) is embedded in the silica gel seal sleeve (442). The sliding sleeve (444) is slidably installed on the fixing screw (441). The lower end of the sliding sleeve (444) is in limit fit with the lower end of the fixing screw (441). A washer (445) is sleeved on the upper part of the sliding sleeve (444). The return spring (443) is sleeved on the sliding sleeve (444). The upper end of the return spring (443) abuts against the third sealing gasket (45), and the lower end abuts against the washer (445).

6. The sealing performance detection device for a hydraulic motor housing according to claim 5, wherein: The outer diameter of the upper part of the silica gel seal sleeve (442) is larger than that of the lower part, and a vertical seal step (446) is formed in the middle.

7. A sealing performance detection device for a hydraulic motor housing according to claim 1, characterized in that: The lateral seal mechanism (5) includes a lateral fixing frame (51), a lateral drive cylinder (52) and a lateral seal column (53). The lateral fixing frame (51) is fixedly installed on the fixed bottom plate (1). The lateral drive cylinder (52) is fixedly installed on the lateral fixing frame (51). The outer end of the lateral seal column (53) is fixedly installed on the piston rod of the lateral drive cylinder (52).

8. An airtightness detection device for a hydraulic motor housing according to claim 7, characterized in that: The lateral seal column (53) is a lateral seal column (53) made of soft rubber, and a seal protrusion (531) is arranged at the inner end of the lateral seal column (53).

9. The sealing detection device for a hydraulic motor housing according to claim 1, characterized in that: The positioning bottom plate (61) extends upward to form a plurality of positioning columns (611), and each positioning column (611) is respectively arranged on the periphery of the lower sealing plate (63).

10. A sealing detection device for a hydraulic motor housing according to any one of claims 1 to 9, characterized in that: The sealing performance detection device is also provided with a control device, and the control device is electrically connected to the vacuum pump (2) and each of the pressure detection mechanisms (3) respectively.

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