A cylinder head combustion surface high pressure test device, method and application

Abstract

The present invention relates to a high-pressure test device, method and application of a cylinder head combustion surface, comprising a bottom plate, the upper surface of which is provided with a sealing seat for sealingly docking with the combustion surface of the cylinder head, and a hydraulic column for pressing the cylinder head, and the test device also comprises an oil pump for providing hydraulic pressure to the sealing seat and the hydraulic column. The test device is provided with an oil pump to simultaneously provide hydraulic pressure to the sealing seat hydraulic column, so that the pressure of the combustion surface of the cylinder head and the force-bearing surface of the hydraulic column are equal, and the total force-bearing area of ​​the hydraulic column is larger than the area of ​​the combustion surface, so that the hydraulic column can obtain sufficient force to fix the cylinder head, and will not be excessively applied, and will not cause damage to the contact surface. The pressure of the hydraulic column and the combustion surface increases step by step and balances each other, so as to achieve a fixing effect without overloading the contact surface of the cylinder head and the sealing seat.

Description

Technical Field

[0001] The invention belongs to the technical field of cylinder head high pressure testing, and in particular relates to a cylinder head combustion surface high pressure testing device, method and application. Background Art

[0002] When a diesel engine is working, the combustion surface of its cylinder head needs to withstand the strong impact force generated by the combustion of diesel in the cylinder body. Therefore, how to effectively conduct high-pressure tests on the combustion surface of the cylinder head to avoid damage to the combustion surface due to combustion pressure during operation and resulting in serious consequences such as cooling water leakage is a crucial test. The purpose of the test is to verify the strength of the cylinder head combustion surface. The test pressure is determined by a coefficient of 1.5 times the actual operating conditions.

[0003] The large-bore cylinder head exerts a great force on the tooling during high-pressure testing. Taking the M390 cylinder head as an example, its cylinder diameter is 390mm and the combustion surface area is 0.119m 2 When the test pressure reaches 35Mp, the force between the tooling and the cylinder head reaches 4165000N, which puts a huge test on the fixation and sealing effect of the tooling. Before the test, the huge fixing force may damage the contact surface between the cylinder head and the tooling in advance. If it is not fixed tightly before the test, it will cause leakage during the pressurization process. Summary of the invention

[0004] The purpose of the present invention is to provide a cylinder head combustion surface high pressure test device, method and application with simple structure and reasonable design in order to solve the above problems.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] A cylinder head combustion surface high pressure test device, comprising a bottom plate, the upper surface of the bottom plate is provided with a sealing seat for sealingly docking with the combustion surface of the cylinder head, and a hydraulic column for pressing the cylinder head, the test device also includes an oil pump for providing hydraulic pressure to the sealing seat and the hydraulic column, the oil pump provides hydraulic pressure to the sealing seat and the hydraulic column respectively through a first branch pipe and a second branch pipe, and a pressure dividing mechanism is provided inside the first branch pipe;

[0007] The pressure-dividing mechanism is used to alternately pressurize the sealing seat and the hydraulic column, and includes a shell and a piston column sliding inside the shell. The piston column divides the shell into a first chamber and a second chamber. A through hole is opened on the surface of the piston column. A spring is arranged inside the first chamber to push the piston column to block the first branch pipe. The first chamber is connected to the rear end of the first branch pipe through the first feedback pipe, and the second chamber is connected to the second branch pipe through the second feedback pipe.

[0008] As a further optimization scheme of the present invention, the sealing seat includes a slot, a sealing ring is arranged between the slot and the cylinder head, a buffer ring for delaying hydraulic shock is arranged inside the slot, a positioning pin for docking and positioning with the mounting hole on the surface of the cylinder head is arranged on the upper surface of the sealing seat, and a first pressure relief valve is also arranged at the bottom end of the slot.

[0009] As a further optimization solution of the present invention, a first pressure gauge and a second pressure gauge are respectively provided inside the first branch pipe and the second branch pipe, and a second pressure relief valve is provided inside the second branch pipe.

[0010] As a further optimization scheme of the present invention, the hydraulic column is arranged inside the hydraulic cylinder, and the hydraulic column contacts the top surface of the cylinder head through the output column fixed at its own end. The hydraulic cylinder is fixed on the surface of the cross bar, and the surface of the base plate is provided with a vertical bar for assembling the cross bar.

[0011] As a further optimization scheme of the present invention, a hook groove for inserting the cross bar is opened on the side surface of the vertical rod, and a buckle plate is provided at the opening of the hook groove, and a hook for lifting the cross bar is provided at the center of the surface of the cross bar.

[0012] A method for performing a high pressure test on the combustion surface of a cylinder head using the above device comprises the following steps:

[0013] S1: Position the cylinder head, align the mounting holes on the surface of the cylinder head with the positioning pins, and then install the cross bar so that the output column on the surface of the cross bar is aligned with the upper surface of the cylinder head;

[0014] S2: Alternately pressurize, start the oil pump to pressurize the hydraulic column, so that the output column presses the cylinder head tightly, when the pressure difference between the second branch pipe and the first branch pipe overcomes the spring resistance, push the piston column to make the first branch pipe conductive, and pressurize the sealing seat, when the pressure difference is not enough to overcome the spring elastic force, the first branch pipe is blocked by the piston column, and the second branch pipe continues to be pressurized, and this is repeated;

[0015] S3: Pressure holding test: when the pressure reaches 35Mp, close the oil pump and all valves, and maintain the pressure for 30 minutes, and observe whether the readings of each pressure gauge change.

[0016] An application of the above test method in a high pressure test of the combustion surface of an engine cylinder head.

[0017] The beneficial effects of the present invention are:

[0018] The present invention provides hydraulic pressure to the sealing seat hydraulic column by arranging an oil pump at the same time, so that the pressures of the combustion surface of the cylinder head and the stress surface of the hydraulic column are equal, and the total stress surface of the hydraulic column is larger than the area of ​​the combustion surface. The hydraulic column can obtain sufficient force to fix the cylinder head without excessive application and causing damage to the contact surface. The pressure of the hydraulic column and the combustion surface gradually increases and balances each other, thereby achieving a fixing effect without overloading the contact surface between the cylinder head and the sealing seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the joint between the sealing seat and the cylinder head of the present invention;

[0021] Figure 3 is a schematic diagram of a voltage dividing mechanism of the present invention;

[0022] Figure 4 It is a schematic diagram of the installation of the crossbar of the present invention;

[0023] Figure 5 This is the bottom view of the cylinder head;

[0024] In the figure: 1. bottom plate; 2. sealing seat; 21. slot; 22. buffer ring; 23. sealing ring; 24. first pressure relief valve; 25. positioning pin; 3. vertical rod; 31. hook groove; 32. horizontal rod; 33. buckle plate; 34. hydraulic cylinder; 35. hydraulic column; 36. output column; 37. hook; 41. oil pump; 42. first branch pipe; 43. second branch pipe; 44. first pressure gauge; 45. second pressure relief valve; 46. second pressure gauge; 5. pressure dividing mechanism; 51. housing; 52. piston column; 53. through hole; 54. first feedback pipe; 55. second feedback pipe; 56. spring; 6. cylinder head; 61. combustion surface; 62. sealing element; 63. mounting hole. DETAILED DESCRIPTION

[0025] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0026] Example 1

[0027] like Figure 1-4As shown, a cylinder head combustion surface high-pressure test device includes a base plate 1, the upper surface of the base plate 1 is provided with a sealing seat 2 for sealingly docking with the combustion surface 61 of the cylinder head 6, and a hydraulic column 35 for pressing the cylinder head 6 is also provided. The test device also includes an oil pump 41 for providing hydraulic pressure to the sealing seat 2 and the hydraulic column 35. The oil pump 41 provides hydraulic pressure to the sealing seat 2 and the hydraulic column 35 through a first branch pipe 42 and a second branch pipe 43 respectively. A pressure dividing mechanism 5 is provided inside the first branch pipe 42.

[0028] The oil pump simultaneously provides hydraulic pressure to the hydraulic column 35 of the sealing seat 2, so that the pressures of the combustion surface 61 of the cylinder head 6 and the force-bearing surface of the hydraulic column 35 are equal, and the total force-bearing area of ​​the hydraulic column 35 is larger than the area of ​​the combustion surface 61. In this way, the hydraulic column 35 can obtain sufficient force to fix the cylinder head 6 without excessive application. Before pressurization, the pressure of the hydraulic column 35 on the cylinder head 6 is relatively small, and no damage to the contact surface is caused. The pressure between the hydraulic column 35 and the combustion surface 61 increases step by step and balances each other, thereby achieving a fixing effect without damaging the contact surface between the cylinder head 6 and the sealing seat 2.

[0029] The pressure-dividing mechanism 5 is used to alternately pressurize the sealing seat 2 and the hydraulic column 35, and includes a shell 51 and a piston column 52 sliding inside the shell 51. The piston column 52 divides the shell 51 into a first chamber and a second chamber. A through hole 53 is provided on the surface of the piston column 52. A spring 56 is provided inside the first chamber to push the piston column 52 to block the first branch pipe 42. The first chamber is connected to the rear end of the first branch pipe 42 through the first feedback pipe 54, and the second chamber is connected to the second branch pipe 43 through the second feedback pipe 55.

[0030] When the oil pump 41 is pressurizing, it first pressurizes the second branch pipe 43. The pressure of the second branch pipe 43 and the pressure at the rear end of the first branch pipe 42 act on both ends of the piston column 52 through the feedback pipe. When the pressure difference overcomes the elastic force of the spring 56, the piston column 52 is pushed, so that the through hole 53 is connected to the first branch pipe 42, and the inside of the sealing seat 2 is pressurized. In theory, when the pressure difference at both ends of the piston column 52 and the elastic force of the spring 56 reach a dynamic balance, the first branch pipe 42 and the second branch pipe 43 are pressurized synchronously, and the rear end of the first branch pipe 42 The pressure at the end is lower than that of the second branch pipe 43, but in actual use, since the oil suction and discharge processes of the oil pump 41 are performed alternately, the actual pressurization process of the first branch pipe 42 and the second branch pipe 43 is alternate pressurization, first the second branch pipe 43 is pressurized, and the piston column 52 is pushed due to the pressure difference to pressurize the first branch pipe 42. When the pressure difference at both ends of the piston column 52 is not enough to overcome the elastic force of the spring 56, the piston column 52 blocks the first branch pipe 42 again, and then the second branch pipe 43 is pressurized, so as to perform alternate pressurization.

[0031] The piston column 52 ensures that the pressure of the second branch pipe 43 is always ahead of the pressure at the rear end of the first branch pipe 42. The hydraulic pressure acts on the hydraulic column 35 and the sealing seat 2, which not only increases the test pressure inside the sealing seat 2, but also correspondingly increases the fixing force of the hydraulic column 35 on the cylinder head 6. The forces at both ends are balanced with each other, and the fixing force is always kept greater than the test pressure. Not only is the fixation firm, but the force on the contact surface between the cylinder head 6 and the sealing seat 2 is also greatly reduced, thereby effectively achieving the effect of fixing and protecting.

[0032] The sealing seat 2 includes a slot 21, and a sealing ring 23 is arranged between the slot 21 and the cylinder head 6. The sealing ring 23 is made of high-strength sealing material and performs axial and radial double sealing. A buffer ring 22 for delaying hydraulic shock is arranged inside the slot 21. The combustion surface 61 of the cylinder head 6 is also provided with a sealing member 62 for blocking the original hole. The upper surface of the sealing seat 2 is provided with a positioning pin 25 for docking with the mounting hole 63 on the surface of the cylinder head 6. The bottom end of the slot 21 is also provided with a first pressure relief valve 24. The first branch pipe 42 and the second branch pipe 43 are respectively provided with a first pressure gauge 44 and a second pressure gauge 46, and the second branch pipe 43 is provided with a second pressure relief valve 45.

[0033] The operation of the oil pump 41 also requires other necessary components, such as an oil tank, valves, etc. (not shown), wherein the oil tank is in communication with the first pressure relief valve 24 and the second pressure relief valve 24 .

[0034] The hydraulic column 35 is arranged inside the hydraulic cylinder 34. The hydraulic column 35 contacts the top surface of the cylinder head 6 through the output column 36 fixed at its end. The hydraulic cylinder 34 is fixed on the surface of the cross bar 32. The surface of the bottom plate 1 is provided with a vertical rod 3 for assembling the cross bar 32. The side surface of the vertical rod 3 is provided with a hook groove 31 for inserting the cross bar 32, and a buckle plate 33 is provided at the opening of the hook groove 31. A hook 37 for lifting the cross bar 32 is provided at the center of the surface of the cross bar 32. By setting a direct contact load-bearing method, the hook groove 31 of the vertical rod 3 is subjected to the reaction force of the cross bar 32. In order to prevent the cross bar 32 from affecting the fixation of the cylinder head 6, it is set to an assembled type and installed by a crane and manual cooperation. The cross bar 32 can also be assembled by other methods.

[0035] In order to use the above device, the present application also proposes a method for high pressure testing of the combustion surface of a cylinder head, comprising the following steps:

[0036] S1: Position the cylinder head 6, align the mounting hole 63 on the surface of the cylinder head 6 with the positioning pin 25, and then install the cross bar 32 so that the output column 36 on the surface of the cross bar 32 is aligned with the upper surface of the cylinder head 6;

[0037] S2: Alternately pressurize, start the oil pump 41 to pressurize the hydraulic column 35, so that the output column 36 presses the cylinder head 6. When the pressure difference between the second branch pipe 43 and the first branch pipe 42 overcomes the resistance of the spring 56, the piston column 52 is pushed to make the first branch pipe 42 conductive, and the sealing seat 2 is pressurized. When the pressure difference is not enough to overcome the elastic force of the spring 56, the first branch pipe 42 is blocked by the piston column 52, and the second branch pipe 43 continues to be pressurized, and this is repeated;

[0038] S3: Pressure holding test: when the pressure reaches 35Mp, close the oil pump 41 and all valves, and maintain the pressure for 30 minutes, and observe whether the readings of each pressure gauge change.

[0039] An application of the above test method in a high pressure test of the combustion surface of an engine cylinder head.

[0040] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A cylinder head combustion surface high pressure test device, comprising a base plate (1), characterized in that: The upper surface of the base plate (1) is provided with a sealing seat (2) for sealingly docking with the combustion surface (61) of the cylinder head (6), and is also provided with a hydraulic column (35) for pressing the cylinder head (6). The test device also includes an oil pump (41) for providing hydraulic pressure to the sealing seat (2) and the hydraulic column (35). The oil pump (41) provides hydraulic pressure to the sealing seat (2) and the hydraulic column (35) respectively through a first branch pipe (42) and a second branch pipe (43). A pressure dividing mechanism (5) is provided inside the first branch pipe (42); The pressure dividing mechanism (5) is used to alternately pressurize the sealing seat (2) and the hydraulic column (35), and comprises a housing (51) and a piston column (52) sliding inside the housing (51), wherein the piston column (52) divides the housing (51) into a first chamber and a second chamber, and a through hole (53) is provided on the surface of the piston column (52), and a spring (56) is provided inside the first chamber for pushing the piston column (52) to block the first branch pipe (42), and the first chamber is connected to the rear end of the first branch pipe (42) through a first feedback pipe (54), and the second chamber is connected to the second branch pipe (43) through a second feedback pipe (55); The hydraulic column (35) is arranged inside the hydraulic cylinder (34). The hydraulic column (35) contacts the top surface of the cylinder head (6) through an output column (36) fixed at its end. The hydraulic cylinder (34) is fixed on the surface of the cross bar (32). The surface of the bottom plate (1) is provided with a vertical rod (3) for assembling the cross bar (32).

2. A cylinder head combustion surface high pressure test device according to claim 1, characterized in that: The sealing seat (2) comprises a slot (21), a sealing ring (23) is arranged between the slot (21) and the cylinder head (6), a buffer ring (22) for delaying hydraulic shock is arranged inside the slot (21), a positioning pin (25) for docking with a mounting hole (63) on the surface of the cylinder head (6) is arranged on the upper surface of the sealing seat (2), and a first pressure relief valve (24) is also arranged at the bottom end of the slot (21).

3. A cylinder head combustion surface high pressure test device according to claim 1, characterized in that: A first pressure gauge (44) and a second pressure gauge (46) are respectively disposed inside the first branch pipe (42) and the second branch pipe (43), and a second pressure relief valve (45) is disposed inside the second branch pipe (43).

4. A cylinder head combustion surface high pressure test device according to claim 1, characterized in that: The side surface of the vertical rod (3) is provided with a hook groove (31) for receiving the cross rod (32), and a buckle plate (33) is arranged at the opening of the hook groove (31). The center of the surface of the cross rod (32) is provided with a hook (37) for lifting the cross rod (32).

5. A method for performing a high pressure test on the combustion surface of a cylinder head using the device according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1: Position the cylinder head (6), align the mounting hole (63) on the surface of the cylinder head (6) with the positioning pin (25), and then install the cross bar (32) so that the output column (36) on the surface of the cross bar (32) is aligned with the upper surface of the cylinder head (6); S2: Alternately pressurizing, starting the oil pump (41) to pressurize the hydraulic column (35), so that the output column (36) presses the cylinder head (6). When the pressure difference between the second branch pipe (43) and the first branch pipe (42) overcomes the resistance of the spring (56), the piston column (52) is pushed to make the first branch pipe (42) conductive, and pressurize the sealing seat (2). When the pressure difference is not enough to overcome the elastic force of the spring (56), the first branch pipe (42) is blocked by the piston column (52), and the second branch pipe (43) continues to be pressurized, and this process is repeated; S3: Pressure holding test: when the pressure reaches 35Mp, close the oil pump (41) and all valves, and hold the pressure for 30 minutes, and observe whether the readings of each pressure gauge change.

6. Application of the method for conducting a high pressure test on the combustion surface of a cylinder head as claimed in claim 5 in a high pressure test on the combustion surface of a cylinder head of an engine.

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