Air cylinder cover sealing performance test tool

Abstract

The utility model relates to the technical field of cylinder cover detection equipment, in particular to a cylinder cover sealing performance test tool, which is used for fixing a cylinder cover body on a test board, and a portal frame is arranged on the test board. The testing tool comprises two transverse clamping assemblies used for transversely limiting the cylinder cover body and an extrusion assembly arranged on the portal frame and used for vertically extruding the cylinder cover body. According to the utility model, through mutual cooperation of the transverse clamping assembly and the extrusion assembly, not only can the cylinder cover be transversely limited, but also the cylinder cover can be vertically extruded, the fixing mode of the traditional cylinder cover is effectively simulated, the accuracy of a sealing performance test value is further ensured, and the whole test tool is high in automation degree and high in efficiency. Extra manual participation is not needed, the fixing time of the cylinder cover is greatly shortened, and the defects caused by fixing the cylinder cover through bolts traditionally are overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of cylinder head detection equipment, in particular to a cylinder head sealing test tool. Background Art

[0002] The cylinder head is a mechanical component used to seal the cylinder. The cylinder head and the piston together form the combustion space and are subjected to the effects of high-temperature and high-pressure gas. Therefore, it is particularly important to test the sealing performance of the cylinder head. The cylinder head structure can be integral, block, or single-body. Currently, the sealing performance of single-body cylinder heads is mostly tested by squeezing the cylinder head to seal it, then pressurizing the internal chamber, and then measuring the pressure change to quickly determine the sealing performance.

[0003] Existing sealing test fixtures mostly achieve the extrusion seal of the cylinder head by tightening bolts, and the connection of the pressurized air pipe is often connected by threaded connection. Although this test fixture can accurately determine the sealing performance of the cylinder head, the cylinder head takes a long time to fix and is more troublesome to disassemble and assemble. Therefore, a cylinder head sealing test fixture is proposed. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a cylinder head sealing test fixture, which solves the technical problem that the prior test fixture is difficult to disassemble and assemble.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: a cylinder head sealing test fixture, the test fixture is used to fix the cylinder head body on a test bench provided with a gantry, the test fixture includes two transverse clamping assemblies for laterally limiting the cylinder head body and an extrusion assembly provided on the gantry for vertically extruding the cylinder head body;

[0006] The transverse clamping assembly includes a sliding member slidably arranged on the test bench, a push rod arranged on the sliding member, a plugging head arranged on the push rod for sealing the working port on the cylinder head body, and a driving assembly arranged under the test bench for driving the sliding member to move;

[0007] The push rod is also provided with an air intake pipe for introducing gas into the cylinder head body. An air intake channel is opened in the push rod and the plugging head, and the air intake channel and the air intake pipe are communicated with each other.

[0008] Preferably, the push rod is also provided with a pre-clamping assembly for pre-clamping the cylinder head body, the pre-clamping assembly includes a pre-clamping part slidably arranged on the push rod and an extrusion sleeve fixedly arranged on the push rod, and the push rod is also provided with an extrusion spring, one end of the extrusion spring abuts against the pre-clamping part, and the other end of the extrusion spring abuts against the inner wall of the extrusion sleeve.

[0009] Preferably, the drive assembly includes a drive shell arranged at the lower end of the test bench, a drive motor arranged on the drive shell, and a screw rod rotatably arranged in the drive shell, and the output end of the drive motor is fixedly connected to the screw rod; the sliding part is provided with an internal threaded through hole for use with the screw rod.

[0010] Preferably, the extrusion assembly includes a hydraulic cylinder provided on the gantry and a pressure plate provided at the telescopic end of the hydraulic cylinder and located inside the gantry;

[0011] Two adjustment plates are provided on both sides of the pressure plate, and two sliding rods are provided on the adjustment plates. A rectangular groove for cooperating with the sliding rods is provided in the pressure plate; an extrusion head for cooperating with the bolt holes of the cylinder head body is provided at the lower end of the adjustment plate;

[0012] The adjusting plate is provided with an adjusting bolt through a threaded connection, and the pressure plate is provided with an internal threaded hole used to match the adjusting bolt.

[0013] Preferably, the test bench is provided with a rubber pad for enhancing sealing performance, and the test bench is also provided with two pressure gauges for detecting air pressure changes.

[0014] By means of the above technical solution, the utility model provides a cylinder head sealing test tool, which has at least the following beneficial effects:

[0015] The utility model can not only realize the lateral limitation of the cylinder head but also realize the vertical extrusion of the cylinder head through the mutual cooperation of the lateral clamping component and the extrusion component, effectively simulating the traditional fixing method of the cylinder head, thereby ensuring the accuracy of the sealing test value, and the whole test fixture has a high degree of automation and does not require additional manual participation, which greatly reduces the fixing time of the cylinder head and solves the disadvantages of the traditional fixing of the cylinder head by bolts. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 This is a schematic diagram of the overall structure of the test bench of the utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the pre-clamping component of the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the transverse clamping assembly of the utility model;

[0020] Figure 4This is a schematic diagram of the structure of the drive assembly of the utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the extrusion assembly of the utility model;

[0022] Figure 6 This is a schematic diagram of the structure of the adjustment plate of the utility model.

[0023] In the figure: 1. Test bench; 101. Gantry; 2. Cylinder head body; 3. Horizontal clamping assembly; 301. Sliding part; 302. Push rod; 303. Sealing head; 304. Pre-clamping part; 305. Extrusion sleeve; 306. Drive housing; 307. Drive motor; 308. Screw; 309. Extrusion spring; 310. Inlet pipe; 4. Extrusion assembly; 401. Hydraulic cylinder; 402. Pressure plate; 403. Adjustment plate; 4031. Sliding rod; 404. Adjustment bolt. DETAILED DESCRIPTION

[0024] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0025] Example 1

[0026] Please refer to Figures 1-6 A cylinder head sealing test fixture is provided. The test fixture is used to fix a cylinder head body 2 on a test bench 1. The test bench 1 is provided with a gantry 101. The test fixture includes two transverse clamping assemblies 3 for laterally limiting the cylinder head body 2 and an extrusion assembly 4 provided on the gantry 101 for vertically extruding the cylinder head body 2.

[0027] The transverse clamping assembly 3 includes a sliding member 301 slidably arranged on the test bench 1, a push rod 302 arranged on the sliding member 301, a blocking head 303 arranged on the push rod 302, and a driving assembly arranged under the test bench 1 for driving the sliding member 301 to move.

[0028] The conventional sealing test of a monolithic cylinder head generally requires the use of multiple bolts to fix the monolithic cylinder head as a whole on the test bench 1. After the monolithic cylinder head is fixed, the pressurized air pipe is screwed into the working ports on both sides of the cylinder head by means of threaded connection. This fixing operation is simple and the sealing test values ​​are accurate, but the only disadvantage is that it takes a long time. In order to speed up the fixing speed of the monolithic cylinder head, the present invention provides a transverse clamping assembly 3 on the test bench 1. The transverse clamping assembly 3 can be used to laterally limit the cylinder head, and when limiting the cylinder head, the push rod 302 in the transverse clamping assembly 3 can also be used to pressurize the internal chamber of the cylinder head, thereby solving the problem that the conventional pressurized air pipe connection takes a long time by threading.

[0029] In order to enhance the sealing performance between the lower end face of the cylinder head and the upper end face of the test bench 1, a gantry 101 is provided on the test bench 1, and an extrusion assembly 4 is provided on the gantry 101. The extrusion assembly 4 applies pressure to the cylinder head from top to bottom, forcing the lower end face of the cylinder head to fit with the upper end face of the test bench 1, thereby enhancing the sealing performance and facilitating subsequent sealing tests.

[0030] Furthermore, the push rod 302 is also provided with a pre-clamping assembly for pre-clamping the cylinder head body 2. The pre-clamping assembly includes a pre-clamping part 304 slidably arranged on the push rod 302 and an extrusion sleeve 305 fixedly arranged on the push rod 302. The push rod 302 is also provided with an extrusion spring 309. One end of the extrusion spring 309 abuts against the pre-clamping part 304, and the other end of the extrusion spring 309 abuts against the inner wall of the extrusion sleeve 305.

[0031] Furthermore, the drive assembly includes a drive shell 306 arranged at the lower end of the test bench 1, a drive motor 307 arranged on the drive shell 306, and a screw rod 308 rotatably arranged in the drive shell 306, and the output end of the drive motor 307 is fixedly connected to the screw rod 308; an internal threaded through hole is opened on the sliding member 301 for use with the screw rod 308.

[0032] Furthermore, the push rod 302 is also provided with an intake pipe 310 for introducing gas into the interior of the cylinder head body 2. An intake channel is opened in the push rod 302 and the plugging head 303, and the intake channel and the intake pipe 310 are interconnected; the push rod 302 and the plugging head 303 are fixed by a threaded connection. If a different type of single-body cylinder head is replaced, the plugging head 303 with a different outer diameter can be replaced for use in combination, which greatly enhances the practicality of the transverse clamping assembly 3.

[0033] The working principle of the transverse clamping assembly 3 is as follows: after the cylinder head is placed on the test bench 1, the two drive motors 307 are started (the two drive motors 307 are of the same model and are controlled by the same PLC controller. This is a prior art and will not be described in detail here). After the drive motors 307 are started, they can drive the screw rod 308 to rotate, thereby driving the sliding member 301 that is threadedly connected to the screw rod 308 to move. Since one end of the push rod 302 is set on the sliding member 301, the drive motor 307 can drive the push rod 302 to move toward the gantry 101 in the middle of the test bench 1 after it is started.

[0034] After the push rod 302 moves, it can drive the pre-clamping assembly to move toward one side of the cylinder head as a whole. As the push rod 302 moves slowly, the pre-clamping part 304 in the pre-clamping assembly will first abut against one side of the cylinder head. Since the two pre-clamping parts 304 on both sides of the cylinder head move the same distance, and an extrusion spring 309 is provided between the pre-clamping part 304 and the extrusion sleeve 305, the cylinder head will gradually move toward the middle of the test bench 1 under the extrusion of the two pre-clamping parts 304, that is, directly under the gantry 101. The advantage of this arrangement is that it does not require manual placement of the cylinder head in the specified position, reducing the labor intensity of the inspectors, and the automatic alignment of the cylinder head can cooperate with the work of the extrusion assembly 4, thereby enabling the entire cylinder head to be automatically fixed for sealing detection without the need for manual participation in the fixing process.

[0035] When the two pre-clamping members 304 limit the cylinder head body 2 to be directly below the gantry 101 (as shown in FIG. Figure 2 As shown in FIG, the push rod 302 continues to move under the drive of the drive motor 307, so that the blocking head 303 at the head of the push rod 302 extends into the openings opened on both sides of the cylinder head body 2. The two blocking heads 303 can seal the internal chamber of the cylinder head body 2, and further, when the axial limit of the cylinder head body 2 is achieved, the internal chamber of the cylinder head body 2 is sealed. At this time, the pre-clamping member 304 slides on the push rod 302, so that the extrusion sleeve 305 fixed on the push rod 302 squeezes the pre-clamping member 304, and the extrusion spring 309 sleeved on the push rod 302 shrinks into the extrusion sleeve 305. The purpose of this arrangement is to increase the limiting area of ​​the cylinder head body 2 and ensure that the cylinder head body 2 does not twist in the plane.

[0036] Since the push rod 302 is also provided with an intake pipe 310 for introducing gas into the cylinder head body 2, gas can be introduced into the cylinder head body 2 through the intake pipe 310 to measure the sealing of the cylinder head body 2. In order to ensure the accuracy of the detection value, the cylinder head body 2 needs to be vertically squeezed.

[0037] Example 2

[0038] Please refer to Figure 5-Figure 6 This embodiment is basically the same as the first embodiment. This embodiment is made on the basis of the first embodiment and has the same beneficial effects as the first embodiment. The same parts can be referred to each other and will not be described in detail here.

[0039] As a further technical solution of this embodiment, the extrusion assembly 4 includes a hydraulic cylinder 401 provided on the gantry 101 and a pressure plate 402 provided at the telescopic end of the hydraulic cylinder 401 and located inside the gantry 101;

[0040] There are two adjustment plates 403 on both sides of the pressure plate 402. Two sliding rods 4031 are provided on the adjustment plate 403. A rectangular groove for matching the sliding rods 4031 is provided in the pressure plate 402. An extrusion head for matching the bolt holes of the cylinder head body 2 is provided at the lower end of the adjustment plate 403.

[0041] An adjusting bolt 404 is provided on the adjusting plate 403 through a threaded connection, and an internal threaded hole for matching with the adjusting bolt 404 is opened on the pressure plate 402 .

[0042] Furthermore, a rubber pad for enhancing the sealing is laid on the test bench 1. Two pressure gauges for detecting changes in air pressure are also provided on the test bench 1. The principle of the cylinder head sealing detection is roughly as follows: gas is introduced into the cylinder head body 2 through the intake pipe 310, and the gas introduction is stopped after reaching a certain pressure. After stabilizing the pressure for a certain period of time, the value change of the pressure gauge on the test bench 1 is observed. If the value is stable, it means that the cylinder head has good sealing. If the value decreases, it means that the cylinder head has poor sealing.

[0043] The extrusion assembly 4 does not pressurize the cylinder head directly, but first inserts the extrusion head into the bolt hole on the cylinder head block, and then presses the cylinder head. This extrusion method will not damage the original structure of the cylinder head block, will not damage the cooling fins on the cylinder head block, and can be as close to the bolt connection fixing method as possible, which is consistent with the traditional cylinder head fixing method;

[0044] The working principle of the extrusion assembly 4 is as follows: after the cylinder head body 2 is limited by the transverse clamping assembly 3, due to the special structure of the transverse clamping assembly 3, the limited cylinder head body 2 is directly below the gantry 101, and the hydraulic cylinder 401 provided on the gantry 101 is started. After the hydraulic cylinder 401 is started, it will drive the pressure plate 402 to move downward, and then drive the extrusion head provided at the lower end of the adjustment plate 403 to descend. When the extrusion head descends to the bolt hole on the cylinder head body 2, the downward extrusion force of the entire pressure plate 402 will be transmitted to several extrusion heads. As the pressure plate 402 continues to descend, the extrusion head will also continuously squeeze the cylinder head body 2, thereby forcing the lower end face of the cylinder head body 2 to fit with the upper end face of the test bench 1. In order to improve the sealing performance of the fit, a rubber pad needs to be provided on the test bench 1.

[0045] Since the position of the bolt holes on the cylinder head body 2 will change with the size of the cylinder head, the position of the extrusion head also needs to be adjusted according to different batches. By rotating the adjusting bolt 404, the relative distance between the adjusting plate 403 and the pressure plate 402 can be changed, thereby changing the position of the extrusion head to adapt to the bolt holes in different positions.

[0046] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by technicians in this field. The provision of power is also common knowledge in this field. In addition, the present invention is mainly used to protect mechanical devices, so the control method and circuit connection are no longer explained in detail in the present invention.

[0047] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to in detail. For the above embodiments, since they are basically similar to the method embodiments, the description is relatively simple. For relevant parts, please refer to the partial description of the method embodiments.

[0048] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cylinder head sealing test fixture, the test fixture is used to fix the cylinder head body (2) on the test bench (1), characterized in that: The test bench (1) is provided with a gantry (101), and the test fixture comprises two transverse clamping assemblies (3) for laterally limiting the cylinder head body (2) and an extrusion assembly (4) provided on the gantry (101) for vertically extruding the cylinder head body (2); The transverse clamping assembly (3) comprises a sliding member (301) slidably arranged on the test bench (1), a push rod (302) arranged on the sliding member (301), a sealing head (303) arranged on the push rod (302) for sealing the working port on the cylinder head body (2), and a driving assembly arranged under the test bench (1) for driving the sliding member (301) to move; The push rod (302) is also provided with an air intake pipe (310) for introducing gas into the cylinder head body (2). An air intake channel is provided in the push rod (302) and the sealing head (303), and the air intake channel and the air intake pipe (310) are communicated with each other.

2. The cylinder head sealing test tool according to claim 1, characterized in that: The push rod (302) is also provided with a pre-clamping assembly for pre-clamping the cylinder head body (2), the pre-clamping assembly comprising a pre-clamping piece (304) slidably arranged on the push rod (302) and an extrusion sleeve (305) fixedly arranged on the push rod (302), and the push rod (302) is also sleeved with an extrusion spring (309), one end of the extrusion spring (309) abuts against the pre-clamping piece (304), and the other end of the extrusion spring (309) abuts against the inner wall of the extrusion sleeve (305).

3. The cylinder head sealing test tool according to claim 1, characterized in that: The driving assembly comprises a driving housing (306) arranged at the lower end of the test bench (1), a driving motor (307) arranged on the driving housing (306), and a screw rod (308) rotatably arranged in the driving housing (306), wherein the output end of the driving motor (307) is fixedly connected to the screw rod (308); and an internal threaded through hole for matching with the screw rod (308) is provided on the sliding member (301).

4. The cylinder head sealing test tool according to claim 1, characterized in that: The extrusion assembly (4) comprises a hydraulic cylinder (401) provided on the gantry (101) and a pressure plate (402) provided at the telescopic end of the hydraulic cylinder (401) and located inside the gantry (101); Two adjustment plates (403) are provided on both sides of the pressure plate (402), two sliding rods (4031) are provided on the adjustment plates (403), and rectangular grooves for cooperating with the sliding rods (4031) are provided in the pressure plate (402); an extrusion head for cooperating with the bolt holes of the cylinder head body (2) is provided at the lower end of the adjustment plate (403); The adjusting plate (403) is provided with an adjusting bolt (404) through a threaded connection, and the pressure plate (402) is provided with an internal threaded hole used in conjunction with the adjusting bolt (404).

5. The cylinder head sealing test tool according to claim 1, characterized in that: The test bench (1) is provided with a rubber pad for enhancing sealing performance, and the test bench (1) is also provided with two pressure gauges for detecting air pressure changes.

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