Tool for detecting leakage after press fitting of bushing

Abstract

The utility model provides a tool for detecting leakage after press fitting of a bushing, which comprises a piece to be detected, the bushing is press-fitted on the piece to be detected, the outer circle of the bushing is in interference fit with an inner hole of the piece to be detected, the bottom of the bushing is provided with a sealing tool, the bottom of the piece to be detected is fixedly provided with a sealing lower pressing plate through a compression screw, a nut and a nylon gasket, and the sealing lower pressing plate is provided with a sealing groove. The sealing lower pressing plate and a vent hole A in the bottom of the tested piece form a sealed space; a lower pressing plate is arranged on the lower portion of the tested piece, a pressing screw penetrates through the lower pressing plate to be connected with the sealing tool, and a sealing ring in a sealing ring groove in the end face of the sealing tool is pressed on the lining, so that a sealed space is formed at the bottom of the lining. According to the utility model, the sealing ring is pressed by the pressing device, so that a sealed space is formed in a detected area, and whether leakage exists in the sealed space or not is judged through pressing and pressure maintaining.

Description

Technical Field

[0001] The utility model belongs to the field of machinery, and in particular relates to a tool for detecting leakage after a bushing is pressed. Background Art

[0002] The bushing is pressed onto the test piece, and the outer circle of the bushing and the inner hole of the test piece are interference fit. After assembly, it is required that there is no leakage on the mating surface within 5 minutes under a pressure of 1.5MPa. In the prior art, a method of forming a sealed space by sealing the outer circle is used to test whether there is leakage. This method has the following disadvantages: ① After long-term use, the O-ring is easily damaged by constant friction with the hole wall. ② If the external air pressure is too high, this type of outer circle sealing will cause the O-ring to shift. In order to effectively solve the problem of leakage test, it is necessary to develop a set of leakage test tooling to judge whether the leakage test is qualified by whether the pressure and pressure maintenance are stable. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a tool for detecting leakage after a bushing is pressed.

[0004] The technical solution of the utility model is implemented as follows: a tool for detecting leakage after pressing a bushing, comprising a tested piece, a bushing pressed on the tested piece, an outer circle of the bushing and an inner hole of the tested piece being interference fit, a sealing tool being provided at the bottom of the bushing, a sealing lower pressing plate B being fixedly installed at the bottom of the tested piece by a clamping screw B, a nut and a nylon washer, and a sealing lower pressing plate B and an air vent A at the bottom of the tested piece form a sealed space; a lower pressing plate A is provided at the lower part of the tested piece, a clamping screw A passes through the lower pressing plate A and is connected to the sealing tool, a sealing ring in a sealing ring groove on the end face of the sealing tool is pressed on the bushing, so that a sealed space is formed at the bottom of the bushing; a sealing upper pressing plate is provided above the tested piece, and the sealing screw is pressed to fasten the sealing upper pressing plate to the tested piece, so that an upper plane of the tested piece and a lower plane of the sealing upper pressing plate form a sealed space; a joint body is fixedly provided on the sealing upper pressing plate, an air inlet is provided in the joint body, the lower part of the joint body is inserted into the air vent B of the sealing tool, and an air compressor is connected to the joint body;

[0005] Preferably, a sealing groove A is provided between the compression sealing screw and the sealing upper pressure plate, a sealing groove B is provided between the sealing upper pressure plate and the upper end surface of the tested piece, a sealing groove C is provided between the upper end surface of the sealing lower pressure plate B and the tested piece, and a sealing ring is provided in each sealing groove.

[0006] The beneficial effect of the utility model is as follows: the utility model compresses the sealing ring through the clamping device to form a closed space in the measured area, and judges whether there is a leakage problem in this sealed space by pressing and maintaining the pressure. If the pressure maintenance is unstable, there must be a leakage point in this closed space. The measured part, bushing and test tooling are placed in water together, and the position of the leakage point is judged by observing the bubbling position, and then it can be directly verified whether there is a gap or air leakage problem between the matching contact surface of the measured part and the bushing, so as to ensure the sealing effect of the press-fit bushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a cross-sectional schematic diagram of the utility model;

[0008] Figure 2 It is a side view of the utility model;

[0009] Figure 3 It is a schematic diagram of the inspection position of the matching contact surface of the utility model.

[0010] Parts description: 1. Compression sealing screw, 2. Connector body, 3. Sealing upper pressure plate, 4. Sealing tooling, 5. Test piece, 6. Lower pressure plate A, 7. Compression screw A, 8. Bushing, 9. Compression screw B, 10. Nylon washer, 11. Nut, 12. Sealing lower pressure plate B, 13. Sealing ring groove, 14. Sealing groove A, 15. Sealing groove B, 16. Vent A, 17. Air inlet, 18. Vent B, 19. Sealing groove C, F, mating contact surface. DETAILED DESCRIPTION

[0011] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0012] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0013] See attached Figure 1-3: A tool for detecting leakage after pressing a bushing, comprising a tested piece 5, a bushing 8 pressed onto the tested piece 5, the outer circle of the bushing 8 and the inner hole of the tested piece 5 being interference fit, a sealing tool 4 being provided at the bottom of the bushing 8, a sealing lower pressing plate B12 being fixed at the bottom of the tested piece 5 by an M10 clamping screw B9, a nut 11 and a nylon washer 10, the sealing lower pressing plate B12 and the vent hole A16 at the bottom of the tested piece 5 forming a sealed space; a lower pressing plate A6 being provided at the lower part of the tested piece 5, an M10 clamping screw A7 passing through the lower pressing plate A6 and connected to the sealing tool 4, the sealing ring in the sealing ring groove 13 on the end face of the sealing tool 4 being pressed onto the bushing 8, so that a sealed space is formed at the bottom of the bushing 8; the tested piece 5 A sealing upper pressure plate 3 is provided above the test piece 5, and an M8 tightening sealing screw 1 fastens the sealing upper pressure plate 3 to the test piece 5, and an upper plane of the test piece 5 and a lower plane of the sealing upper pressure plate 3 form a sealed space; a joint body 2 is fixedly provided on the sealing upper pressure plate 3, and an air inlet hole 17 is provided in the joint body 2. The lower part of the joint body 2 is inserted into the air vent B18 of the sealing tool 4, and the air compressor is connected to the joint body 2, a sealing groove A14 is provided between the tightening sealing screw 1 and the sealing upper pressure plate 3, a sealing groove B15 is provided between the sealing upper pressure plate 3 and the upper end surface of the test piece 5, a sealing groove C19 is provided between the upper end surface of the sealing lower pressure plate B12 and the test piece 5, and a sealing ring is provided in each sealing groove.

[0014] In order to detect the sealing condition of the tested part after the bushing is pressed, a sealed cavity is formed at the assembly contact position after assembling the parts of the test tooling. A pressure test is performed on the cavity to determine whether there is a leakage problem.

[0015] Usage: Prepare the assembled test piece and bushing, place the sealing tool 4 at the bottom of the bushing 8, use the M10 clamping screw A7 to pass through the lower pressure plate A6 to tighten the sealing tool 4 so that it is close to the bottom of the bushing to seal, then cover the welded body of the sealing upper pressure plate 3 and the joint body 2 on the upper end face of the test piece 5, and insert the lower part of the joint body into the vent 18 of the sealing tool 4, then use the M8 clamping sealing screw 1 to press the sealing upper pressure plate 3 on the upper end face of the test piece 5 to seal, then pass the M10 clamping screw B9 through the sealing lower pressure plate B12 and pad the nylon washer 10, and tighten with the nut 11. Note that the nylon washer must be padded to protect the surface of the workpiece so that the bottom vent is sealed. Connect the hose to the joint body through the hose joint valve, and control the start and end of the pressure of the air compressor through the switch joint valve.

[0016] The sealing ring is compressed by the clamping device to form a closed space in the tested area. The pressure is applied and maintained to determine whether there is a leakage in this sealed space. If the pressure maintenance is unstable, there must be a leakage point in this closed space. The tested piece, bushing and test tooling are placed in water together, and the location of the leakage point is determined by observing the bubbling position. It can then be directly verified whether there is a gap or air leakage between the mating contact surfaces of the tested piece and the bushing to ensure the sealing effect of the press-fit bushing.

[0017] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A tool for detecting leakage after a bushing is pressed, comprising a test piece (5), a bushing (8) pressed onto the test piece (5), an outer circle of the bushing (8) and an inner hole of the test piece (5) being interference fit, characterized in that A sealing tool (4) is provided at the bottom of the bushing (8), and a sealing lower pressure plate B (12) is fixedly installed at the bottom of the tested object (5) by means of a clamping screw B (9), a nut (11) and a nylon washer (10). The sealing lower pressure plate B (12) and the vent hole A (16) at the bottom of the tested object (5) form a sealed space; a lower pressure plate A (6) is provided at the bottom of the tested object (5), and a clamping screw A (7) passes through the lower pressure plate A (6) and is connected to the sealing tool (4). The sealing ring in the sealing ring groove (13) on the end face of the sealing tool (4) is pressed against the bushing ( 8), so that a sealed space is formed at the bottom of the bushing (8); a sealed upper pressure plate (3) is provided above the test piece (5), and the sealing screw (1) is tightened to fasten the sealed upper pressure plate (3) to the test piece (5), so that a sealed space is formed between the upper plane of the test piece (5) and the lower plane of the sealed upper pressure plate (3); a joint body (2) is fixedly provided on the sealed upper pressure plate (3), and an air inlet hole (17) is provided in the joint body (2), and the lower part of the joint body (2) is inserted into the air vent B (18) of the sealing tool (4), and the air compressor is connected to the joint body (2).

2. A tool for detecting leakage after press-fitting a bushing as claimed in claim 1, characterized in that A sealing groove A (14) is provided between the compression sealing screw (1) and the sealing upper pressure plate (3), a sealing groove B (15) is provided between the sealing upper pressure plate (3) and the upper end surface of the tested object (5), and a sealing groove C (19) is provided between the upper end surface of the sealing lower pressure plate B (12) and the tested object (5), and a sealing ring is provided in each sealing groove.

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