Pressure testing device for engine housing

Abstract

The invention provides a pressure testing device for an engine shell, and belongs to the technical field of engine detection, the pressure testing device comprises a base, a supporting assembly, a driving assembly, a lifting assembly and a pressure applying head, the base is provided with a power coupling part, and the supporting assembly comprises a supporting frame rotatably arranged on the base and at least two groups of positioning columns arranged on the supporting frame. Wherein the positioning column is used for limiting the engine shell in the radial direction, the driving assembly is in transmission connection with the supporting frame to drive the supporting frame to rotate on the base, the lifting assembly is arranged on the supporting frame and provided with a lifting part used for bearing the engine shell, and the lifting part is intermittently matched with the power coupling part in the rotating process of the supporting frame. And the pressure applying head is arranged on the base in a sliding mode and used for applying pressure to the outer surface of the engine shell. According to the invention, continuous, dead-corner-free and standardized pressure testing can be carried out on the engine shell, and the requirements of modern engine high-quality manufacturing and detection are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engine detection, in particular to a pressure testing device for engine shell. BACKGROUND

[0002] The engine shell is a key pressure-bearing component for containing high-temperature and high-pressure working medium, and its structural strength is directly related to the safety and reliability of equipment operation. In order to ensure that it can withstand the design conditions throughout its life cycle without failure, precise and reliable pressure testing must be performed on the key areas of stress concentration or high risk on the shell.

[0003] At present, the engine shell pressure testing usually adopts a fixed installation or a manually held pressure testing head to apply pressure on the shell surface and perform detection. However, due to the structural characteristics of the engine shell usually having a large and complex curved surface, it is a great challenge to accurately position and test these specific local areas on the complex curved shell.

[0004] Specifically, the fixed testing device is difficult to continuously fit the complex curved surface, especially the circumferential sidewall of the shell, and the test points are easily scattered, thereby missing potential defect points; while the manually held way has higher flexibility, but it cannot guarantee to apply uniform and continuous pressure on the different height layer curved surfaces of these specific local areas, and it is also difficult to accurately control the consistency of the position of the contact point and the moving speed of the testing head, resulting in poor comparability of the test results of different areas or different times. The foregoing factors will all affect the standardization and reliability of the test, and cannot meet the needs of modern engine high-quality manufacturing and detection. SUMMARY

[0005] Therefore, the purpose of the present application is to provide a pressure testing device for engine shell, which can continuously, without dead angle, and standardize the pressure testing on the specific local areas of the engine shell, so as to improve the comprehensiveness, efficiency and consistency of the test, and meet the needs of modern engine high-quality manufacturing and detection.

[0006] In order to achieve the above object, the technical scheme adopted by the present application is as follows: A pressure testing device for an engine shell, comprising a base, a supporting assembly, a driving assembly, a lifting assembly and a pressure head. The base is provided with a power coupling part. The supporting assembly comprises a supporting frame rotatably arranged on the base and at least two groups of positioning columns arranged on the supporting frame, wherein the positioning columns are used for radially limiting the engine shell. The driving assembly is in transmission connection with the supporting frame to drive the supporting frame to rotate on the base. The lifting assembly is arranged on the supporting frame and has a lifting part used for supporting the engine shell. During the rotation of the supporting frame, the lifting part intermittently cooperates with the power coupling part to make the lifting part intermittently move vertically upward or downward by a preset height. The pressure head is slidably arranged on the base and is used for applying pressure to the outer surface of the engine shell.

[0007] In addition, the pressure testing device for an engine shell according to the present application can further have the following additional technical features: Further, the driving assembly comprises a rotary driver, a worm and a turbine. The rotary driver is arranged on the base. The worm is in power connection with the rotary driver. The turbine is arranged on the base and is coaxially connected with the supporting frame.

[0008] Further, the base is provided with an arc-shaped rack. The lifting assembly comprises a lead screw, a gear piece and a supporting piece. The lead screw is rotationally connected with the supporting frame and is axially limited on the supporting frame. The gear piece is arranged on the lead screw and is periodically engaged with the arc-shaped rack. The supporting piece is threadedly connected with the lead screw and is rotationally limited on the supporting frame.

[0009] Further, the supporting piece comprises a supporting ring which is slidably sleeved on the positioning column.

[0010] Further, a threaded sleeve is vertically arranged on the supporting ring. An axial direction of the threaded sleeve is provided with a threaded hole. A top end of the lead screw is threadedly assembled in the threaded hole.

[0011] Further, the axial direction of the threaded sleeve is further provided with a limiting hole coaxial with the threaded hole. A diameter of the limiting hole is greater than a diameter of the lead screw. A top end of the lead screw is threadedly connected with a limiting block matching the diameter of the limiting hole.

[0012] Further, the supporting frame is provided with an assembly hole. A bearing is fixedly arranged in the assembly hole. The lead screw penetrates through the assembly hole and is in interference fit with an inner ring of the bearing.

[0013] Further, a set of the positioning columns is coaxially arranged with the support frame and is provided with a sliding hole penetrating in the radial direction, and the pressure testing device of the engine shell further comprises a locking mechanism, the locking mechanism comprising a sliding rod, a first elastic mechanism, oppositely arranged clamping blocks, a sliding block and a second elastic mechanism. The sliding rod is vertically slidably arranged on the support frame, and the sliding rod is coaxially arranged with the support frame. The first elastic mechanism is arranged between the sliding rod and the support frame. The clamping blocks are slidably arranged in the sliding hole, and the clamping blocks are drivingly connected with the sliding rod. The sliding block is horizontally slidably arranged on the base, and the sliding rod is drivingly connected with the sliding block to drive the sliding rod to move up and down when moving horizontally. The sliding block is limitingly connected with the pressure head, and the second elastic mechanism is arranged between the sliding block and the base. The first elastic mechanism is used to provide an elastic thrust to drive the sliding rod to move, so that the two sets of clamping blocks are both moved radially inward. The second elastic mechanism is used to provide an elastic thrust to drive the sliding block to move, so as to drive the sliding rod to move and make the two sets of clamping blocks both move radially outward. The pressure head is used to resist the elastic thrust of the second elastic mechanism.

[0014] Further, the bottom end of the sliding rod is inclined wedge matched with the sliding block, and the top of the sliding rod is inclined wedge matched with the clamping block.

[0015] Further, the pressure testing device of the engine shell further comprises a fire spraying mechanism, the fire spraying mechanism comprising a fire spraying pipe and a third elastic mechanism. The fire spraying pipe is slidably arranged on the base, and the fire spraying pipe is limitingly connected with the pressure head. The third elastic mechanism is arranged between the fire spraying pipe and the base. When the pressure head is close to the engine shell, the fire spraying pipe is driven to move in the same direction. The third elastic mechanism is used to provide an elastic thrust to drive the fire spraying pipe to move in the opposite direction.

[0016] The beneficial effects of the present application at least include: through the linkage design of the support frame self-rotation and the lifting assembly, the pressure head can continuously and stably apply pressure along the complex curved surface of the engine shell; at the same time, the periodic meshing of the arc-shaped rack and the gear realizes the automatic adjustment of the test height according to the preset interval, solves the problem that the fixed device is difficult to fit the curved surface and the problem that the artificial handheld cannot guarantee the consistency of the height, and significantly improves the test coverage and positioning accuracy; at the same time, the locking mechanism is linked with the clamping block through the inclined wedge and the sliding rod, and when the pressure head contacts the shell, the radial locking is automatically triggered (driven by the first elastic mechanism), and when the pressure head is withdrawn, the locking is released (driven by the second elastic mechanism), realizing the automatic dynamic fixing of the shell during the test process and ensuring the positioning accuracy of the test point; at the same time, the worm gear transmission provides stable rotary drive with high torque and low speed, and cooperates with the lifting structure composed of the lead screw and the threaded sleeve to realize high-precision height adjustment; in addition, the flame spraying mechanism is linked with the pressure head, and the high-temperature environment can be simulated during the pressure test. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structure schematic view of the pressure test device for the engine shell in an embodiment of the present application. Figure 2 It is an assembly drawing of the driving assembly in an embodiment of the present application. Figure 3 It is a structure schematic view of the pressure test device for the engine shell in an embodiment of the present application. Figure 4 It is a structure schematic view of the support assembly in an embodiment of the present application. Figure 5 It is a structure schematic view of the driving assembly in an embodiment of the present application. Figure 6 It is a structure schematic view of the lifting assembly in an embodiment of the present application. Figure 7 It is a sectional view of the support frame in an embodiment of the present application. Figure 8 It is Figure 7 It is a local enlarged view of A in FIG. 6. Figure 9 It is a structure schematic view of the locking mechanism in an embodiment of the present application. Figure 10 It is an explosion view of part of the structure of the locking mechanism in an embodiment of the present application. Figure 11 It is a structure schematic view of the flame spraying mechanism in an embodiment of the present application. Figure 12 It is a structure schematic view of the pressure head in an embodiment of the present application. Explanation of main element symbols: Base 100, arc-shaped rack 110, sliding sleeve 120, support assembly 200, support frame 210, assembly hole 211, bearing 212, positioning column 220, sliding hole 221, driving assembly 300, rotary driver 310, worm 320, turbine 330, lifting assembly 400, lead screw 410, limiting block 411, gear piece 420, support piece 430, threaded sleeve 431, threaded hole 4311, limiting hole 4312, pressing head 500, driving baffle 510, fixed seat 520, pressing head 530, engine shell 600, insertion hole 610, flat area 620, protective shell 700, locking mechanism 800, sliding rod 810, first elastic mechanism 820, clamping block 830, sliding block 840, first passive baffle 841, second elastic mechanism 850, fire spraying mechanism 900, fire spraying pipe 910, second passive baffle 911, third elastic mechanism 920; The following detailed description will further describe the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0018] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The drawings show several embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0019] It should be noted that when an element is referred to as being "fixedly attached" to another element, it can be directly on the other element or there can be intervening elements. When an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements can be present. As used herein the terms "vertical", "horizontal", "left", "right" and the like are merely used for the purpose of illustration.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0021] Reference will now be made to Figures 1 to 12The application provides an engine shell pressure testing device, which comprises a base 100, a supporting assembly 200, a driving assembly 300, a lifting assembly 400 and a pressure head 500. Specifically, the base 100 is provided with a power coupling part, the supporting assembly 200 comprises a supporting frame 210 rotatably arranged on the base 100 and at least two groups of positioning columns 220 arranged on the supporting frame 210, and the engine shell 600 is provided with a hole 610 matching the diameter of the positioning columns 220, so that the positioning columns 220 are inserted into the hole 610, thereby limiting the engine shell 600 in the radial direction through the positioning columns 220 and achieving the purpose of accurately positioning the engine shell 600 on the supporting frame 210. The driving assembly 300 is in transmission connection with the supporting frame 210, and when the driving assembly 300 is in a working state, the driving assembly 300 drives the supporting frame 210 to rotate on the base 100, so that the pressure head 500 can be pressed on different specific local areas of the same height layer of the engine shell 600. The lifting assembly 400 is arranged on the supporting frame 210, and the lifting assembly 400 has a lifting part for supporting the engine shell 600.

[0022] In the embodiment, in the process of the rotation of the supporting frame 210, the lifting part intermittently cooperates with the power coupling part, so that the lifting part intermittently moves vertically upward or downward by a preset height, and the pressure head 500 is slidably arranged on the base 100 and used for applying uniform and continuous pressure to the outer surface of the engine shell 600. In addition, since the height of the pressure head 500 is constant, when the lifting part intermittently moves vertically upward or downward by the preset height, the engine shell 600 also moves vertically upward or downward by the preset height, so that the pressure head 500 can apply uniform and continuous pressure to different height layers of the specific local areas of the engine shell 600.

[0023] In some optional embodiments, as shown in Figure 2 、 Figure 5 The driving assembly 300 comprises a rotary driver 310, a worm 320 and a turbine 330.

[0024] In the embodiment, when the rotary driver 310 is in a working state, the rotary driver 310 drives the worm 320 to rotate, and the rotation of the worm 320 drives the supporting frame 210 to rotate on the base 100. Alternatively, the rotary driver 310 can be a rotary motor, a rotary hydraulic cylinder or a rotary air cylinder.

[0025] In some optional embodiments, as shown in Figure 8As shown, the base 100 is provided with an arc-shaped rack 110 to form a power coupling part on the base 100, and the lifting assembly 400 comprises a lead screw 410, a gear part 420, and a support part 430. Specifically, the lead screw 410 is rotationally arranged on the support frame 210, i.e. the lead screw 410 can rotate relative to the support frame 210, while the lead screw 410 is axially limited on the support frame 210, so that when the lead screw 410 rotates relative to the support frame 210, the lead screw 410 will not be separated from the support frame 210. The gear part 420 is arranged on the lead screw 410, and when the gear part 420 rotates one circle relative to the support frame 210, the gear part 420 is engaged with the arc-shaped rack 110. When the gear part 420 is engaged with the arc-shaped rack 110, the arc-shaped rack drives the gear part 420 to rotate, and in turn drives the lead screw 410 to rotate relative to the support frame 210. It can be understood that the number of rotation of the lead screw 410 is related to the arc length of the arc-shaped rack 110 and the transmission ratio of the arc-shaped rack 110 and the gear part 420. The support part 430 is threadedly connected to the lead screw 410, and the support part 430 is rotationally limited on the support frame 210, so that when the lead screw 410 rotates, the support part 430 will move upward or downward because the support part 430 will not rotate relative to the support frame 210, and in turn push the engine housing 600 to move upward or downward on the positioning column 220.

[0026] In the embodiment, as shown in Figure 1 The engine housing 600 is also provided with a region E that does not need to be tested, and at this time, the installation position of the arc-shaped rack 110 can be reasonably set according to the position and size of the region E, so that the pressure head 500 is engaged with the gear part 420 when passing through the region E.

[0027] In the embodiment, as shown in Figure 1 The base 100 is provided with a protective shell 700, and the protective shell 700 surrounds the engine housing 600. By arranging the protective shell 700, the personnel and equipment in the work site can be protected from the splashing metal fragments caused by the structural failure of the engine housing 600 when the pressure test is performed.

[0028] In some optional embodiments, as shown in Figure 6As shown, the support member 430 comprises a support ring, which is provided with a flat area 620 around the insertion hole 610 of the engine housing 600 correspondingly, and the support ring is sleeved on the positioning column 220, and the upper surface of the support ring supports the flat area 620 stably upward. When the support ring is screwed with the lead screw 410, the support ring cannot rotate on the outer circumferential surface of the positioning column 220, but can move upward or downward on the outer circumferential surface of the positioning column 220. In this way, the rotation of the support ring is limited on the support frame 210, so that when the lead screw 410 rotates, the support ring moves upward or downward, thereby pushing the engine housing 600 to move upward or downward on the positioning column 220.

[0029] It can be understood that the support ring can be sleeved on a plurality of positioning columns 220, or can be sleeved on one or several positioning columns 220, but the support ring can stably support the engine housing 600 upward.

[0030] In some optional embodiments, as shown in Figure 7 As shown, a threaded sleeve 431 is vertically arranged on the support ring, the threaded sleeve 431 is axially provided with a threaded hole 4311, and the top end of the lead screw 410 is screwed into the threaded hole 4311, so as to realize the threaded connection between the support ring and the lead screw 410.

[0031] In some optional embodiments, as shown in Figure 7 As shown, the threaded sleeve 431 is axially provided with a limiting hole 4312 coaxial with the threaded hole 4311, the diameter of the limiting hole 4312 is greater than the diameter of the lead screw 410, and the top end of the lead screw 410 is screwed with a limiting block 411 matching the diameter of the limiting hole 4312. Since the top end of the threaded sleeve 431 is closed, the height of the support ring descending can be limited, and since the limiting hole 4312 resists the limiting block 411, the height of the support ring ascending can be limited, so as to avoid the position interference between the engine housing 600 and other components, and prevent the support ring from falling off the lead screw 410.

[0032] In some optional embodiments, as shown in Figure 7 , Figure 8 As shown, the support frame 210 is provided with an assembly hole 211, and the assembly hole 211 is fixedly provided with a bearing 212. Specifically, the lead screw 410 is arranged in the assembly hole 211, and the lead screw 410 is in interference fit with the inner ring of the bearing 212, and the outer ring of the bearing 212 is clamped in the assembly hole 211, so that the lead screw 410 can rotate relative to the support frame 210 through the bearing 212, and when the lead screw 410 rotates relative to the support frame 210, the lead screw 410 will not be separated from the assembly hole 211.

[0033] In some optional embodiments, asFigure 9 、 Figure 10 As shown in FIG. 8, the middle positioning column 220 is coaxially arranged with the support frame 210, and the middle positioning column 220 is provided with a sliding hole 221 penetrating in the radial direction. The pressure testing device of the engine shell further comprises a locking mechanism 800. The locking mechanism 800 can prevent the combined force generated by the pressure head 500 from being inclined when the pressure head 500 is not vertically pressed on the engine shell 600, for example, when the pressure head 500 is in contact with a certain inclined surface on the engine shell 600. At this time, the vertical component of the combined force can drive the engine shell 600 to move upward or downward along the positioning column 220, thereby affecting the accuracy of the pressure test.

[0034] The locking mechanism 800 comprises a sliding rod 810, a first elastic mechanism 820, oppositely arranged clamping blocks 830, a sliding block 840, and a second elastic mechanism 850. Specifically, the sliding rod 810 is vertically slidably arranged on the support frame 210, and the sliding rod 810 is coaxially arranged with the support frame 210. The first elastic mechanism 820 is arranged between the sliding rod 810 and the support frame 210. The clamping blocks 830 are horizontally slidably arranged in the sliding hole 221, and the clamping blocks 830 are drivingly connected to the sliding rod 810. The sliding block 840 is horizontally slidably arranged on the base 100, and the sliding rod 810 is drivingly connected to the sliding block 840. The sliding block 840 drives the sliding rod 810 to move up and down when the sliding block 840 moves horizontally. The pressure head 500 is provided with a driving baffle 510. The end of the sliding block 840 close to the pressure head 500 is provided with a first driven baffle 841. The second elastic mechanism 850 is arranged between the sliding block 840 and the base 100.

[0035] In the present embodiment, when the pressure head 500 moves left away from the right engine shell 600, the active baffle 510 generates a leftward pushing force on the first passive baffle 841, which makes the slider 840 move left, and in turn makes the second elastic mechanism 850 generate a rightward elastic pushing force, at the same time, the slide rod 810 moves down on the support frame 210 under the action of the first elastic mechanism 820; when the pressure head 500 moves right and gradually approaches the right engine shell 600, the slider 840 moves right under the action of the second elastic mechanism 850, and in turn the slider 840 drives the slide rod 810 to move up on the support frame 210, so that the two sets of clamping blocks 830 are both moved radially outward, at this time, the slider 840 moves right synchronously with the pressure head 500 due to the limiting action of the active baffle 510 on the first passive baffle 841, when the pressure head 500 moves right for a distance, the second elastic mechanism 850 no longer generates a rightward elastic pushing force, and the active baffle 510 no longer contacts the first passive baffle 841, at this time, the slider 840 no longer drives the slide rod 810 to move up on the support frame 210, and the two sets of clamping blocks 830 tightly press on the engine shell 600 through the slide hole 221, so that the engine shell 600 is firmly fixed on the positioning column 220. When the pressure test of the next height layer is needed, the pressure head 500 moves left away from the right engine shell 600 until the active baffle 510 generates a leftward pushing force on the first passive baffle 841, which makes the slider 840 move left, and in turn makes the second elastic mechanism 850 generate a rightward elastic pushing force, and the slide rod 810 moves down on the support frame 210 under the action of the first elastic mechanism 820.

[0036] In some optional embodiments, as shown in Figure 9 、 Figure 10 The first elastic mechanism 820 includes a first spring, and the two ends of the first spring are fixedly connected with the support frame 210 and the slide rod 810 respectively, and the second elastic mechanism 850 includes a second spring, and the two ends of the second spring are fixedly connected with the slider 840 and the base 100 respectively.

[0037] In the present embodiment, when the pressing head 500 is pressed against the engine shell 600, the elastic pushing force to the right generated by the second spring, the elastic pushing force downward generated by the first spring, and the gravity of the slide rod 810 and other components are balanced. When the pressing head 500 moves to the left and away from the right engine shell 600, the active baffle 510 generates a pushing force to the left on the first passive baffle 841, which makes the sliding block 840 move to the left, and further makes the second spring continue to be stretched to the left to generate an elastic pushing force to the right. Under the action of the elastic pushing force downward generated by the first spring, the slide rod 810 moves downward on the support frame 210. When the pressing head 500 moves to the right and gradually approaches the right engine shell 600, the sliding block 840 moves to the right under the action of the elastic pushing force to the right generated by the second spring, and further the sliding block 840 drives the slide rod 810 to move upward on the support frame 210, and further makes the first spring be stretched upward to generate an elastic pushing force downward. The slide rod 810 moving upward makes the two sets of clamping blocks 830 move radially outward. At this time, due to the limiting action of the active baffle 510 on the first passive baffle 841, the sliding block 840 moves to the right synchronously with the pressing head 500. When the pressing head 500 moves to the right for a distance, the second elastic mechanism 850 no longer generates an elastic pushing force to the right, and the active baffle 510 no longer contacts the first passive baffle 841. At this time, the elastic pushing force to the right generated by the second spring, the elastic pushing force downward generated by the first spring, and the gravity of the slide rod 810 and other components are balanced. The two sets of clamping blocks 830 tightly press on the engine shell 600 through the slide hole 221, so that the engine shell 600 is stably fixed on the positioning column 220. When the pressure test of the next height layer is needed, the pressing head 500 moves to the left and away from the right engine shell 600 until the active baffle 510 generates a pushing force to the left on the first passive baffle 841, which makes the sliding block 840 move to the left.

[0038] In some optional embodiments, as shown in Figure 9 , a slide sleeve 120 is arranged at the bottom of the base 100, the sliding block 840 is sleeved in the slide sleeve 120, and the second elastic mechanism 850 is arranged between the sliding block 840 and the slide sleeve 120.

[0039] In some optional embodiments, as shown in Figure 9 , the bottom end of the slide rod 810 is in wedge cooperation with the sliding block 840, and the top of the slide rod 810 is in wedge cooperation with the clamping block 830.

[0040] In some optional embodiments, convex points are arranged on the outer side surface of the clamping block 830, so as to increase the friction between the clamping block 830 and the engine shell 600.

[0041] In some optional embodiments, as shown in Figure 1 , Figure 2 ,Figure 11 As shown in FIG. 9, the pressure testing device of the engine housing further comprises a fire spraying mechanism 900, by which the engine housing 600 can be tested at different temperatures. The fire spraying mechanism 900 comprises a fire spraying pipe 910 and a third elastic mechanism 920. Specifically, the fire spraying pipe 910 is slidably arranged on the base 100, and a second passive baffle 911 is arranged on the fire spraying pipe 910. When the pressing head 500 moves rightward and gradually approaches the right engine housing 600, the pressing head 500 abuts against the second passive baffle 911, thereby pushing the fire spraying pipe 910 to move rightward along with the pressing head 500. The third elastic mechanism 920 is arranged between the fire spraying pipe 910 and the base 100. When the pressing head 500 moves away from the engine housing 600, the fire spraying pipe 910 reversely moves under the action of the third elastic mechanism 920.

[0042] In some optional embodiments, as shown in FIG. 10, Figure 1 , Figure 2 , Figure 11 As shown in FIG. 9, the third elastic mechanism 920 comprises a third spring, and two ends of the third spring are fixedly connected with the fire spraying pipe 910 and the base 100 respectively. In this embodiment, when the pressing head 500 moves rightward and gradually approaches the right engine housing 600, the pressing head 500 abuts against the second passive baffle 911, thereby pushing the fire spraying pipe 910 to move rightward along with the pressing head 500, and at this time, the third spring is compressed. When the pressing head 500 moves away from the engine housing 600, the fire spraying pipe 910 reversely moves under the action of the left elastic pushing force generated by the third spring.

[0043] In some optional embodiments, as shown in FIG. 10, Figure 12 As shown in FIG. 10, the pressing head 500 comprises a fixed seat 520 and a pressing head 530, and the active baffle 510 is arranged on the fixed seat 520. The pressing head 530 is threadedly connected to the fixed seat 520. In this way, by adjusting the screwed length of the pressing head 530 on the fixed seat 520, the pressure acting on the engine housing 600 can be adjusted within a certain range, thereby realizing the fine adjustment function during the pressure testing.

[0044] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In this specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0045] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the protection scope of the present application. It should be pointed out that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A pressure testing device for an engine housing, characterized by, The engine shell pressure testing device comprises: a base provided with a power coupling part; a support assembly comprising a support frame rotatably arranged on the base, and at least two groups of positioning columns arranged on the support frame, wherein the positioning columns are used for radially limiting the engine shell; a driving assembly in transmission connection with the support frame to drive the support frame to rotate on the base; a lifting assembly arranged on the support frame, the lifting assembly having a lifting part used for supporting the engine shell, wherein the lifting part is intermittently matched with the power coupling part in the process of the rotation of the support frame, so that the lifting part is intermittently moved vertically upward or downward by a preset height; a pressure head slidably arranged on the base and used for applying pressure to the outer surface of the engine shell.

2. The pressure testing apparatus for an engine enclosure of claim 1, wherein, The driving assembly comprises: a rotary driver arranged on the base; a worm in power connection with the rotary driver; a turbine rotatably arranged on the base and coaxially connected with the support frame.

3. The pressure testing apparatus for an engine enclosure of claim 2, wherein, The base is provided with an arc-shaped rack, and the lifting assembly comprises: a lead screw rotatably connected with the support frame and axially limited on the support frame; a gear member arranged on the lead screw and periodically engaged with the arc-shaped rack; a support member threadedly connected with the lead screw and rotationally limited on the support frame.

4. The pressure testing apparatus for an engine enclosure of claim 3, wherein, The support member comprises a support ring slidably sleeved on the positioning column.

5. The pressure testing apparatus for an engine enclosure of claim 4, wherein, A threaded sleeve is vertically arranged on the support ring, an axial threaded hole is arranged on the threaded sleeve, and a top end of the lead screw is threadedly assembled in the threaded hole.

6. The pressure testing apparatus for an engine enclosure of claim 5, wherein, An axial limiting hole coaxial with the threaded hole is further arranged on the threaded sleeve, the limiting hole has a diameter greater than that of the lead screw, and a limiting block matching the diameter of the limiting hole is threadedly connected with the top end of the lead screw.

7. The pressure testing apparatus for an engine enclosure of claim 3, wherein, An assembly hole is arranged on the support frame, a bearing is fixedly arranged in the assembly hole, the lead screw passes through the assembly hole and is in interference fit with an inner ring of the bearing.

8. The pressure testing apparatus of any one of claims 1 to 7, wherein, One group of the positioning columns is coaxially arranged with the support frame and is provided with a through sliding hole in the radial direction, and the engine shell pressure testing device further comprises a locking mechanism, the locking mechanism comprises: a sliding rod vertically slidably arranged on the support frame and coaxially arranged with the support frame; a first elastic mechanism arranged between the sliding rod and the support frame; oppositely arranged clamping blocks slidably arranged in the sliding hole and in transmission connection with the sliding rod; a sliding block horizontally slidably arranged on the base, the sliding rod and the sliding block are in transmission connection to drive the sliding rod to move up and down when horizontally moving, the sliding block is in limiting connection with the pressure head; a second elastic mechanism arranged between the sliding block and the base; wherein the first elastic mechanism is used for providing an elastic thrust to drive the sliding rod to move, so that the two groups of clamping blocks are both moved radially inward; the second elastic mechanism is used for providing an elastic thrust to drive the sliding block to move, so as to drive the sliding rod to move and make the two groups of clamping blocks both move radially outward, and the pressure head is used for resisting the elastic thrust of the second elastic mechanism.

9. The pressure testing apparatus for an engine enclosure of claim 8, wherein, The bottom end of the slide rod cooperates with the slider wedge, and the top of the slide rod cooperates with the clamping block wedge.

10. The pressure testing apparatus of claim 1, wherein, The pressure testing device of the engine shell further comprises a fire spraying mechanism, which comprises: A fire spraying pipe is slidably arranged on the base and connected with the pressure head limiting device; A third elastic mechanism is arranged between the fire spraying pipe and the base; When the pressure head approaches the engine shell, the fire spraying pipe is driven to move in the same direction, and the third elastic mechanism is used to provide elastic thrust to drive the fire spraying pipe to move in the opposite direction.

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