A cylinder head assembly water pressure test device and method

Abstract

The present invention discloses a cylinder head assembly water pressure test device in the technical field of cylinder head assembly water pressure test, the test device includes: a water supply module, and also includes: an exhaust type column, wherein: the exhaust type column includes an assembly body arranged in a hole to be sealed, a limiter is fixedly provided in the inner cavity of the assembly body, a buoyancy driving device is arranged in the limiter, a control member is arranged on the limiter, a sealing plate for blocking the opening is arranged in the inner cavity of the assembly body, and the sealing plate is driven to move along the axis of the assembly body by telescopic device 2. In this technical solution, during the water pressure test, liquid enters so that the air in the main body of the cylinder head assembly is discharged from the assembly body, and subsequently the floating plate is driven upward under the action of the liquid, and the control member controls the telescopic device 2 to drive the sealing plate downward to contact the limiter to complete the water injection and exhaust sealing work of the main body of the cylinder head assembly assembly, thereby greatly improving the working efficiency of the water pressure test on the main body of the cylinder head assembly assembly.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic testing of a cylinder head assembly, and in particular to a hydraulic testing device and method for a cylinder head assembly. Background Art

[0002] The diesel engine cylinder head, cylinder liner and piston form a combustion chamber, where the diesel is compressed, exploded and burned to provide power for the locomotive. The temperature here can reach 2000℃. In order to ensure the normal operation of the cylinder head, a circulating cooling water cavity and passage are designed inside it. The sealing performance of the water cavity is one of the important technical indicators for whether the diesel engine can work normally.

[0003] Therefore, after the cylinder head assembly is produced, it needs to be subjected to a water pressure test through a water pressure test device. It is difficult to exhaust the air in the water chamber of the existing cylinder head assembly during the water pressure test. If the internal air is not exhausted, it will not only lead to a long stamping time, but also fail to ensure the accuracy and reliability of the water pressure test. Although the air inside the cylinder head assembly can be extracted by external equipment before the test, this method is more troublesome to use and increases the cost of use. Moreover, after vacuuming, the external equipment is separated from the cylinder head assembly, and the connection cannot be sealed in time, which easily causes air to enter the cylinder head assembly again, affecting the subsequent water pressure test. To this end, we propose a cylinder head assembly water pressure test device and method. Summary of the invention

[0004] The object of the present invention is to provide a cylinder head assembly water pressure test device and method to solve the problem in the above background technology that the cylinder head assembly cannot be automatically vented and sealed during the water pressure test.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a cylinder head assembly hydraulic test device, used for performing a hydraulic test on a cylinder head assembly main body, the cylinder head assembly main body is provided with a water inlet hole and a hole to be sealed which are connected to its water cavity, the test device comprises: a water supply module, the output end of the water supply module is detachably connected to the water inlet hole through a water supply pipe, and also comprises: an exhaust column, wherein:

[0006] The exhaust column includes an assembly body arranged in the hole to be sealed, both ends and the inner cavity of the assembly body are hollow, and the assembly body discharges the air in its water cavity when water enters the water cavity of the cylinder head assembly body, and a limiter is fixedly provided in the inner cavity of the assembly body, and a through opening is penetrated through the limiter, and a buoyancy driving device is arranged in the limiter, and a control member is arranged on the limiter, and a sealing plate is arranged in the inner cavity of the assembly body for sealing the through opening, and the sealing plate is driven to move along the axis of the assembly body by telescopic device 2, and the buoyancy driving device contacts the control member under the action of the water level in the water cavity, and controls the telescopic device 2 through the control member to drive the sealing plate to seal the through opening.

[0007] A further improvement is that the buoyancy drive device includes a floating plate, a movable column and an elastic member, the movable column is movably arranged in the assembly, the floating plate is arranged at one end of the movable column, and is used to drive the movable column to move along the axis of the assembly, a plurality of groups of through openings are opened on the floating plate, the floating plate can enter and exit the inner cavity of the assembly and cannot pass through the limit member, the sealing plate is movably sleeved on the outer wall of the movable column, and the elastic member is arranged at the other end of the movable column, the floating plate moves upward or downward under the drive of the water level in the main water cavity of the cylinder head assembly, and is convenient to cooperate with the control member on the limit member to realize automatic sealing after exhaust, and effectively avoids liquid discharge from the assembly, when draining water, the water level of the main water cavity of the cylinder head assembly drops, and the elastic member drives the movable column to reset the floating plate downward, so that the main water cavity of the cylinder head assembly is circulated with the outside through the assembly, which plays an auxiliary pressure relief role.

[0008] A further improvement is that the elastic member is connected to an assembly frame, and the assembly frame is sleeved on the exhaust-type column. The assembly frame is driven by a telescopic device and drives the exhaust-type column to move in the direction of the hole to be sealed. The exhaust-type column can be driven in and out of the hole to be sealed by the telescopic device, which is convenient for rapid assembly of the exhaust-type column and the hole to be sealed, greatly improving the work efficiency and work quality of the water pressure test on the main body of the cylinder head assembly assembly.

[0009] A further improvement is that the control component includes a touch-on button that cooperates with the floating plate and a touch-off button that cooperates with the sealing plate. The touch-on button is embedded in the lower surface of the limiter, and the touch-off button is embedded in the upper surface of the limiter. The touch-off button and the touch-on button are both connected to telescopic device 2. The floating plate moves under the drive of the water level in the water cavity of the cylinder head assembly main body. In cooperation with the touch switch button and the touch-off button, the telescopic device 2 automatically drives the sealing plate downward to seal the opening on the limiter, thereby completing the water cavity sealing of the cylinder head assembly main body. No manual operation is required, thereby reducing manual labor intensity and further improving the work efficiency of the cylinder head assembly main body in the water pressure test.

[0010] A further improvement is that an airbag is sleeved on the outer wall of the floating plate, and a limiting convex edge is sleeved on the upper and lower sides of the floating plate and is arranged to guide the airbag when it expands or contracts. A plurality of through holes are opened on the limiting convex edge, and a cavity is provided inside the movable column. The airbag is connected to the cavity in the movable column through a connecting air pipe, and a docking air pipe connected to the cavity is provided on the outer wall of the movable column. Gas can be injected into or discharged from the airbag through the docking air pipe. Injecting gas to expand the airbag can strengthen the seal at the connection between the sealing plate and the limiting plate, and discharging gas can reduce the contact area between the floating plate and the liquid, reduce the damage to the inner hollow column caused by the internal pressure, and reduce the probability of water spraying out;

[0011] A further improvement is that the assembly includes an inner hollow column and an outer hollow column movably sleeved on the outer side of the inner hollow column, a cavity is formed between the inner hollow column and the outer hollow column, a sealing plate is detachably provided at the end of the cavity for sealing, a sensing element for judging whether water has entered the cavity is provided in the cavity, and during the water pressure test, when the inner hollow column is damaged and leaks due to excessive pressure, liquid enters the cavity, and the liquid can be detected by the sensing element for timely manual processing;

[0012] A further improvement is that a second solenoid valve is provided in the water supply pipe, and a first solenoid valve is provided in the docking air pipe. After the induction element determines that there is liquid in the cavity, the second solenoid valve is closed and the first solenoid valve is opened, thereby stopping the water inflow at the water supply pipe, avoiding the increase in the damage caused by the continuous increase in pressure, and reducing the probability of water spraying out. At the same time, the gas is discharged from the airbag, reducing the contact area between the floating plate and the liquid, reducing the damage to the inner hollow column caused by the internal pressure, and further reducing the probability of water spraying out.

[0013] A further improvement is that the cylinder head assembly assembly body is supported by a support frame and clamped and fixed by a clamping device, thereby ensuring that the cylinder head assembly assembly body can stably perform the water pressure test.

[0014] A method for assembling a cylinder head assembly hydraulic pressure test device, comprising the following steps:

[0015] S1: When in use, the cylinder head assembly assembly body is fixed on the support frame by the clamping device, the water supply pipe is connected to the water inlet hole, the telescopic device is opened to drive the assembly frame to drive the exhaust column into the hole to be sealed, and the water supply module is used to supply liquid, and the liquid gradually enters the water cavity of the cylinder head assembly assembly body, so that the air inside it is discharged outward through the assembly body;

[0016] S2: Subsequently, the internal liquid water level contacts the floating plate, driving the floating plate to drive the movable column to move upward to squeeze the elastic member until the floating plate contacts the bottom of the limiter and contacts the control member. At this time, the telescopic device 2 works to drive the sealing plate downward to contact the top of the limiter and contact the control member. At this time, the telescopic device 2 stops working to complete the exhaust sealing work, and then the liquid that subsequently enters the water cavity of the main body of the cylinder head assembly will not be discharged from the assembly.

[0017] S3: Maintain the pressure in the water cavity to the required level for the required time, check whether the cylinder head assembly has any leakage, and observe whether the pressure value of the water cavity in the cylinder head assembly decreases or changes. After the test is qualified, drain the water and release the pressure, and use compressed air to blow away any traces of water inside and outside the cylinder head assembly;

[0018] S4: During the water pressure test, when the inner hollow column is damaged and leaks due to excessive pressure, liquid enters the cavity. After the sensor detects the liquid, solenoid valve one opens and solenoid valve two closes. At this time, water no longer enters the water inlet hole, and the air in the airbag enters the movable column from the connecting air pipe and is then discharged from the docking air pipe, reducing the contact area between the float and the liquid, thereby relieving pressure and preventing the inner hollow column from being further compressed and damaged.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The technical solution is provided with an exhaust column, which allows liquid to normally enter the main body of the cylinder head assembly during the water pressure test. The liquid enters so that the air in the main body of the cylinder head assembly is discharged from the assembly. Subsequently, under the action of the liquid, the float plate is driven upward to contact the limit member and the control member controls the telescopic device 2. The telescopic device 2 drives the sealing plate downward to contact the limit member to complete the water injection, exhaust and sealing work of the main body of the cylinder head assembly, thereby greatly improving the work efficiency and work quality of the water pressure test on the main body of the cylinder head assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a cylinder head assembly water pressure test device of the present invention;

[0022] Figure 2 A three-dimensional diagram of the exhaust column structure of a hydraulic test device for a cylinder head assembly of the present invention;

[0023] Figure 3 For the present invention Figure 2 Middle structure section view;

[0024] Figure 4 For the present invention Figure 3 A magnified view of the structure in the middle;

[0025] Figure 5 For the present invention Figure 2 Stereoscopic diagram of the internal local structure;

[0026] Figure 6 It is a stereoscopic view of the main structure of the existing cylinder head assembly assembly of the present invention.

[0027] In the figure: 1. cylinder head assembly main body; 11. water inlet hole; 12. hole to be sealed; 2. clamping device; 3. water supply module; 4. water supply pipe; 5. telescopic device 1; 6. assembly frame; 7. exhaust column; 71. assembly body; 711. inner hollow column; 712. outer hollow column; 713. cavity; 714. sealing plate; 715. sensing element; 72. buoyancy drive device; 721. floating plate; 722. movable column; 723. elastic element; 724. solenoid valve 1; 725. connecting air pipe; 726. limiting convex edge; 727. air bag; 73. limiting element; 74. sealing plate; 75. control element; 76. telescopic device 2. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0029] Example 1

[0030] See also Figure 1 and Figure 6 , a cylinder head assembly assembly water pressure test device, used for performing a water pressure test on a cylinder head assembly assembly body 1, the cylinder head assembly assembly body 1 belongs to the prior art, the cylinder head assembly assembly body 1 is provided with a water inlet hole 11 and a to-be-sealed hole 12 which are connected to its water chamber (not shown in the figure), but it is not limited thereto and will not be described in detail here. In actual use, the cylinder head assembly assembly body 1 is supported by a support frame and clamped and fixed by a clamping device 2 to ensure that the cylinder head assembly assembly body 1 can stably perform the water pressure test, the clamping device 2 belongs to the prior art and will not be described in detail here;

[0031] See also Figure 1-5The hydraulic pressure test device for performing hydraulic pressure test on the main body 1 of the cylinder head assembly assembly comprises: a water supply module 3 and an exhaust column 7. The output end of the water supply module 3 is detachably connected to the water inlet hole 11 through a water supply pipe 4. The water supply module 3 here can be, for example, a water pump, but is not limited thereto. A solenoid valve 2 is arranged in the water supply pipe 4. The exhaust column 7 is arranged at the hole to be sealed 12 to block it. An assembly rack 6 is fixedly sleeved on the exhaust column 7. The assembly rack 6 is driven by a telescopic device 5 and drives the exhaust column 7 to move toward the hole to be sealed 12. The exhaust column 7 can be driven in and out of the hole to be sealed 12 through the telescopic device 5, which is convenient for the rapid assembly of the exhaust column 7 and the hole to be sealed 12, greatly improving the work efficiency and work quality of the hydraulic pressure test on the main body 1 of the cylinder head assembly assembly. The telescopic device 5 here can be, for example, a cylinder, but is not limited thereto. Among them:

[0032] The exhaust column 7 includes an assembly body 71 arranged in the hole to be sealed 12. Both ends and the inner cavity of the assembly body 71 are hollow. The assembly body 71 discharges the air in the water cavity when water enters the water cavity of the cylinder head assembly main body 1. A limiter 73 is fixedly provided in the inner cavity of the assembly body 71. A through hole is penetrated through the limiter 73. A buoyancy driving device 72 is arranged in the limiter 73. A control member 75 is arranged on the limiter 73. A sealing plate 74 is arranged in the inner cavity of the assembly body 71 for blocking the through hole and moving along the axis of the assembly body 71. The sealing plate 74 is driven to move along the axis of the assembly body 71 by the telescopic device 76. The buoyancy driving device 72 moves under the action of the water level in the water cavity. The control member 75 is contacted, and the control member 75 controls the telescopic device 2 76 to drive the sealing plate 74 to seal the opening. The control member 75 controls the telescopic device 2 76 to drive the sealing plate 74 to contact the stopper 73, and the water injection and exhaust sealing work of the cylinder head assembly main body 1 is completed, so that the liquid that continues to enter the water cavity of the cylinder head assembly main body 1 will not be discharged from the assembly body 71, which greatly improves the work efficiency and work quality of the water pressure test of the cylinder head assembly main body 1. It should be noted that when the sealing plate 74 does not block the stopper 73, it will not affect the normal discharge of the air in the water cavity of the cylinder head assembly main body 1 from the assembly body 71. For example, please refer to Figure 3 , the cross-section of the inner cavity of the assembly 71 is circular, and the shape of the limit member 73 can adopt a circular ring structure that is compatible with the inner cavity of the assembly 71. The opening of the limit member 73 will not allow the floating plate 721 to pass through. The sealing plate 74 can adopt a circular ring structure with a diameter larger than the inner diameter of the opening of the limit member 73 and smaller than the inner diameter of the assembly 71. In this way, when the sealing plate 74 does not contact the limit member 73, the air can be normally discharged from the top of the assembly 71 through the opening of the limit member 73 and the sealing plate 74. Of course, the sealing plate 74 and the limit member 73 are not limited to the above structure.

[0033] Example 2

[0034] See also Figure 2-5The buoyancy driving device 72 includes a floating plate 721, a movable column 722 and an elastic member 723. The movable column 722 is movably arranged in the assembly 71. The movable column 722 has a cavity inside. The floating plate 721 is arranged at one end of the movable column 722, and is used to drive the movable column 722 to move along the axis of the assembly 71. The floating plate 721 is provided with a plurality of groups of openings. The floating plate 721 can enter and exit the inner cavity of the assembly 71 and cannot pass through the limiter 73. The outer wall of the floating plate 721 is provided with an airbag 727, and the airbag 727 can be made of rubber material. 727 is connected with the cavity in the movable column 722 through the connecting air pipe 725. The floating plate 721 is provided with a limiting convex edge 726 on the upper and lower sides of the air bag 727 to guide the air bag 727 when it expands or contracts. The limiting convex edge 726 is provided with a plurality of through holes. The sealing plate 74 is movably sleeved on the outer wall of the movable column 722. The elastic member 723 is provided at the other end of the movable column 722. The elastic member 723 is connected to the assembly frame 6. The outer wall of the movable column 722 is provided with a docking air pipe connected with the cavity. A solenoid valve 724 is provided in the docking air pipe.

[0035] The float plate 721 moves upward or downward under the drive of the water level in the water cavity of the cylinder head assembly main body 1, so as to cooperate with the control member 75 on the limit member 73 to realize automatic sealing after exhaust, and effectively prevent the liquid from being discharged from the assembly body 71. When draining water, the water level in the water cavity of the cylinder head assembly main body 1 drops, and the elastic member 723 drives the movable column 722 to reset the float plate 721 downward, so that the water cavity of the cylinder head assembly main body 1 is circulated with the outside through the assembly body 71, which plays an auxiliary pressure relief role. Gas can be injected into or discharged from the air bag 727 through the docking air pipe. The injection of gas causes the air bag 727 to expand, which can strengthen the seal at the connection between the sealing plate 74 and the limit plate, discharge the gas, reduce the contact area between the float plate 721 and the liquid, reduce the damage to the inner hollow column 711 caused by the internal pressure, and reduce the probability of water spraying out. The elastic member 723 is, for example, a spring structure.

[0036] Example 3

[0037] See also Figure 4 The control member 75 includes a touch-on button that cooperates with the floating plate 721 and a touch-off button that cooperates with the sealing plate 74. The touch-on button is embedded in the lower surface of the limit member 73, and the touch-off button is embedded in the upper surface of the limit member 73. The touch-off button and the touch-on button are both connected to the telescopic device 2 76. The floating plate 721 moves under the drive of the water level in the water cavity of the cylinder head assembly main body 1. In cooperation with the touch switch button and the touch-off button, the telescopic device 2 76 automatically drives the sealing plate 74 downward to block the opening on the limit member 73, thereby completing the water cavity sealing of the cylinder head assembly main body 1. No manual operation is required, which reduces the labor intensity and further improves the work efficiency of the cylinder head assembly main body 1 in performing water pressure testing.

[0038] Example 4

[0039] See also Figure 2-4 The assembly 71 includes an inner hollow column 711 and an outer hollow column 712 movably sleeved on the outer side of the inner hollow column 711, a cavity 713 is formed between the inner hollow column 711 and the outer hollow column 712, and a sealing plate 714 is detachably provided at the end of the cavity 713 for blocking, and the outer hollow column 712 is adapted to the hole 12 to be sealed, so that the air and liquid at the hole 12 to be sealed can only enter and exit from the assembly 71, and a sensing element 715 for detecting whether the cavity 713 is leaking is provided in the cavity 713, and the sensing element 715 belongs to the prior art, and the sensing element 715 is connected to an external controller, for example, the sensing element 715 is Resistance change sensing unit, when the sensing element 715 contacts the liquid, the resistance of the sensing element 715 will change, so that a signal can be sent to the external controller. The shape of the sensing element 715 can be annular, but is not limited to this. The shape of the sensing element 715 is not specifically limited here. Any shape of the sensing element 715 that can accurately and quickly detect water leakage is within the protection scope of the present invention. During the water pressure test, when the inner hollow column 711 is damaged and leaks due to excessive pressure, liquid enters the cavity 713, and the liquid can be detected by the sensing element 715, so that manual timely processing is required;

[0040] See also Figure 1-4 The solenoid valve 2 in the water supply pipe 4 and the solenoid valve 1 724 in the connecting air pipe are both connected to the external controller. The sensor 715 detects the liquid and sends a signal to the external controller. The external controller controls the solenoid valve 2 to close and the solenoid valve 1 724 to open. At this time, the water supply pipe 4 stops inflowing to avoid the increase in damage caused by continuous pressure increase and reduce the probability of water spraying out. At the same time, the gas is discharged from the airbag 727, and the airbag 727 shrinks, reducing the contact area between the float 721 and the liquid, reducing the damage caused by the internal pressure to the inner hollow column 711, and further reducing the probability of water spraying out.

[0041] S1: When in use, the cylinder head assembly assembly body 1 is fixed on the support frame by the clamping device 2, the water supply pipe 4 is connected to the water inlet hole 11, the telescopic device 15 is opened to drive the assembly frame 6 to drive the exhaust column 7 into the hole to be sealed 12, and the water supply module 3 is used to supply liquid, and the liquid gradually enters the water cavity of the cylinder head assembly assembly body 1, so that the air inside it is discharged outward through the assembly body 71;

[0042] S2: Subsequently, the internal liquid level contacts the floating plate 721, driving the floating plate 721 to drive the movable column 722 to move upward to squeeze the elastic member 723, until the floating plate 721 contacts the bottom of the stopper 73 and contacts the control member 75. At this time, the telescopic device 2 76 works to drive the sealing plate 74 downward to contact the top of the stopper 73 and contact the control member 75. At this time, the telescopic device 2 76 stops working to complete the exhaust sealing work, and the liquid that subsequently enters the water cavity of the cylinder head assembly main body 1 will not be discharged from the assembly body 71;

[0043] S3: Maintain the pressure in the water cavity to the required level for the required time, check whether the cylinder head assembly main body 1 has leakage, and observe whether the pressure value of the water cavity of the cylinder head assembly main body 1 decreases and changes. After the test is qualified, drain the water and release the pressure, and use compressed air to blow away the water traces inside and outside the cylinder head assembly main body 1;

[0044] S4: During the water pressure test, when the inner hollow column 711 is damaged and leaks due to excessive pressure, liquid enters the cavity 713. After the sensor 715 detects the liquid, the solenoid valve 1 724 opens and the solenoid valve 2 closes. At this time, water no longer enters the water inlet hole 11, and the air in the airbag 727 enters the movable column 722 from the connecting air pipe 725 and is then discharged from the docking air pipe, reducing the contact area between the float 721 and the liquid, thereby relieving pressure and preventing the inner hollow column 711 from being further compressed and damaged.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cylinder head assembly hydraulic test device, used for performing a hydraulic test on a cylinder head assembly main body (1), wherein the cylinder head assembly main body (1) is provided with a water inlet hole (11) and a hole to be sealed (12) which are connected to a water cavity thereof, the test device comprising: A water supply module (3), wherein the output end of the water supply module (3) is detachably connected to the water inlet hole (11) via a water supply pipe (4), and is characterized in that it further comprises: an exhaust column (7), wherein: The exhaust column (7) comprises an assembly (71) disposed in the hole to be sealed (12), both ends and the inner cavity of the assembly (71) being hollow, the assembly (71) discharging air from the water cavity when water enters the water cavity of the cylinder head assembly main body (1), a limiting member (73) being fixedly disposed in the inner cavity of the assembly (71), a through opening being penetrated through the limiting member (73), a buoyancy driving device (72) being disposed in the limiting member (73), and the limiting member (73) being provided with a buoyancy driving device (72). The positioning member (73) is provided with a control member (75); the inner cavity of the assembly (71) is provided with a sealing plate (74) that moves along the axis of the assembly (71) and is used to seal the opening; the sealing plate (74) is driven to move along the axis of the assembly (71) by the second telescopic device (76); the buoyancy driving device (72) contacts the control member (75) under the action of the water level in the water cavity, and controls the second telescopic device (76) through the control member (75) to drive the sealing plate (74) to seal the opening; The buoyancy driving device (72) comprises a floating plate (721), a movable column (722) and an elastic member (723); the movable column (722) is movably arranged in the assembly (71); the floating plate (721) is arranged at one end of the movable column (722) and is used to drive the movable column (722) to move along the axis of the assembly (71); a plurality of groups of through openings are opened on the floating plate (721); the floating plate (721) can enter and exit the inner cavity of the assembly (71) and cannot pass through the limiting member (73); the sealing plate (74) is movably sleeved on the outer wall of the movable column (722); and the elastic member (723) is arranged at the other end of the movable column (722).

2. A cylinder head assembly hydraulic test device according to claim 1, characterized in that: The elastic member (723) is connected to an assembly frame (6), and the assembly frame (6) is sleeved on the exhaust column (7). The assembly frame (6) is driven by a telescopic device (5) and drives the exhaust column (7) to move in the direction of the hole (12) to be sealed.

3. A cylinder head assembly water pressure test device according to claim 2, characterized in that: The control member (75) comprises a touch-on button cooperating with the floating plate (721) and a touch-off button cooperating with the sealing plate (74); the touch-on button is embedded in the lower surface of the limiting member (73); the touch-off button is embedded in the upper surface of the limiting member (73); and both the touch-off button and the touch-on button are connected to the second telescopic device (76).

4. A cylinder head assembly water pressure test device according to claim 3, characterized in that: The outer wall of the floating plate (721) is provided with an airbag (727), and the floating plate (721) is provided with limiting convex edges (726) on the upper and lower sides of the airbag (727) for guiding the airbag (727) when it expands or contracts. The limiting convex edges (726) are provided with a plurality of groups of through holes. The movable column (722) has a cavity inside. The airbag (727) is connected to the cavity in the movable column (722) through a connecting air pipe (725), and the outer wall of the movable column (722) is provided with a docking air pipe connected to the cavity.

5. A cylinder head assembly water pressure test device according to claim 4, characterized in that: The assembly (71) comprises an inner hollow column (711) and an outer hollow column (712) movably sleeved on the outer side of the inner hollow column (711); a cavity (713) is formed between the inner hollow column (711) and the outer hollow column (712); a sealing plate (714) is detachably provided at the end of the cavity (713) for sealing; and a sensing element (715) is provided in the cavity (713) for determining whether water has entered the cavity (713).

6. A cylinder head assembly water pressure test device according to claim 5, characterized in that: A second solenoid valve is provided in the water supply pipe (4), and a first solenoid valve (724) is provided in the connecting air pipe. After the sensor (715 determines that there is liquid in the cavity (713), the second solenoid valve is controlled to close and the first solenoid valve (724) to open.

7. A cylinder head assembly water pressure test device according to claim 6, characterized in that: The cylinder head assembly assembly body (1) is supported by a support frame and is clamped and fixed by a clamping device (2).

8. A test method using the cylinder head assembly water pressure test device according to claim 7, characterized in that: The following steps are involved: S1: When in use, the cylinder head assembly assembly body (1) is fixed to the support frame by means of the clamping device (2), the water supply pipe (4) is connected to the water inlet hole (11), the telescopic device (5) is opened to drive the assembly frame (6) to drive the exhaust column (7) to enter the hole to be sealed (12), and the water supply module (3) supplies liquid, and the liquid gradually enters the water cavity of the cylinder head assembly assembly body (1), so that the air inside the cylinder head assembly assembly body (1) is discharged to the outside through the assembly body (71); S2: Subsequently, the internal liquid level contacts the floating plate (721), driving the floating plate (721) to drive the movable column (722) to move upward to squeeze the elastic member (723), until the floating plate (721) contacts the bottom of the stop member (73) and contacts the control member (75). At this time, the telescopic device (76) works to drive the sealing plate (74) downward to contact the top of the stop member (73) and contact the control member (75). At this time, the telescopic device (76) stops working, completing the exhaust sealing work, and the liquid that subsequently enters the water cavity of the cylinder head assembly main body (1) will not be discharged from the assembly body (71); S3: Maintain the pressure in the water chamber to the required level for the required time, check whether the cylinder head assembly main body (1) has any leakage, and observe whether the pressure value of the water chamber of the cylinder head assembly main body (1) decreases and changes. After the test is passed, drain the water and release the pressure, and use compressed air to blow away any traces of water inside and outside the cylinder head assembly main body (1); S4: During the water pressure test, when the inner hollow column (711) is damaged and leaks due to excessive pressure, liquid enters the cavity (713). After the sensor (715) detects the liquid, the solenoid valve 1 (724) is opened and the solenoid valve 2 is closed. At this time, water no longer enters the water inlet hole (11), and the air in the air bag (727) enters the movable column (722) from the connecting air pipe (725) and is then discharged from the docking air pipe, thereby reducing the contact area between the floating plate (721) and the liquid, thereby achieving a pressure relief effect and preventing the inner hollow column (711) from being further damaged by pressure.

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