Subway rail vehicle oil damper sealing ring contraction installation tool and method

Abstract

The invention relates to the technical field of metro rail vehicle oil pressure shock absorbers, in particular to a metro rail vehicle oil pressure shock absorber sealing ring shrinkage installation tool and method, a guide sleeve push-in type installation method is adopted, a sealing ring does not need to be bent, and therefore the physical reliability is effectively improved, the production efficiency is improved, and the quality risk is reduced. In the contraction mounting tool for the sealing ring of the oil damper of the subway rail vehicle, the small end part of a guide sleeve is used for being inserted into an inner hole of a guide seat, and the large end part of a taper hole of the guide sleeve is upward; the sealing ring is placed in the taper hole of the guide sleeve, and the shot opening end of the sealing ring faces downwards; the push rod is used for pressing the sealing ring into a groove where the O-shaped ring is located. The leveling mandrel is used for being inserted into the sealing ring and expanding and leveling the sealing ring.

Description

Technical Field

[0001] The invention relates to the technical field of oil pressure shock absorbers for subway rail vehicles, and in particular to a shrinking installation tool and method for a sealing ring of an oil pressure shock absorber for a subway rail vehicle, and in particular improves a traditional installation method of bending into a kidney shape. Background Art

[0002] At present, a large number of O-ring and sealing ring combined sealing structures (also called Step seals) are used in the existing subway rail vehicle oil pressure shock absorber guide seat structures. The Step seals are composed of two or more series sealing systems. Specifically, the Step seals are composed of O-rings and sealing rings, and there are multiple groups of them distributed along the axial direction, and they are installed in the grooves of the guide covers to play the role of multiple sealing.

[0003] In the prior art, during installation, the O-ring is first placed in the sealing groove of the guide cover. The O-ring is mostly made of oil-resistant nitrile rubber and can easily enter the groove after being bent. The sealing ring is then bent into a kidney shape using a special tool and placed in the groove.

[0004] However, because the sealing ring is made of PTFE (polytetrafluoroethylene), it is easy to form bending marks when it is bent, and the marks are not easy to remove during subsequent leveling; and when the bending marks cannot be removed, the oil of the shock absorber will leak from the bend during operation, causing leakage failure of the shock absorber. Summary of the invention

[0005] The object of the present invention is to provide a shrinking installation tool and method for the sealing ring of the oil pressure shock absorber of a subway rail vehicle, which adopts a guide sleeve push-in installation method without bending the sealing ring, thereby effectively improving physical reliability, improving production efficiency and reducing quality risks.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme: A shrinking installation tool for a sealing ring of an oil pressure shock absorber of a subway rail vehicle comprises: a guide sleeve with an inner taper, a push rod, and a leveling mandrel; The small end of the guide sleeve is used to be inserted into the inner hole of the guide seat, and the large end of the tapered hole of the guide sleeve is upward; the sealing ring is placed in the tapered hole of the guide sleeve, and the round end of the sealing ring is downward; The push rod is used to press the sealing ring into the groove where the O-ring is located; The flattening mandrel is used for inserting into the sealing ring and expanding and flattening the sealing ring.

[0007] Wherein, the guide sleeve with an inner taper comprises: a guide sleeve body with a tapered hole, and an introduction section integrally formed with the guide sleeve body, and the introduction section is located at the small end of the tapered hole of the guide sleeve; The introduction section comprises: a wedge-shaped portion connected to the guide sleeve body, and a straight tube portion connected to the wedge-shaped portion; the wedge-shaped portion and the tapered hole of the guide sleeve are in the same direction, and the straight tube portion has a straight hole.

[0008] Specifically, the push rod is a cylinder, and an exhaust channel is provided at the bottom center of the cylinder.

[0009] Furthermore, the leveling mandrel comprises: a cylindrical section, and a wedge-shaped section integrally formed with the cylindrical section, and the wedge-shaped section is arranged toward the axial direction.

[0010] A method for shrinking and installing a sealing ring of an oil pressure shock absorber of a subway rail vehicle comprises the following steps: Install the O-ring into the guide seat groove; Pass the sealing ring through the guide sleeve with an inner taper and press it into the guide seat groove using a push rod; Use a leveling mandrel for extended leveling.

[0011] In actual application, the sealing ring is passed through a guide sleeve with an inner taper and pressed into the guide seat groove using a push rod, which specifically includes the following steps: Insert the small end of the guide sleeve into the inner hole of the guide seat, with the large end of the tapered hole of the guide sleeve facing upward; put the sealing ring into the tapered hole of the guide sleeve, with the round end of the sealing ring facing downward; Use a push rod to press the sealing ring into the groove where the O-ring is located; Remove the push rod.

[0012] The use of a leveling mandrel to perform expansion and leveling specifically includes the following steps: Use a leveling mandrel to insert it into the sealing ring 3-4 times to expand and level the sealing ring.

[0013] Compared with the prior art, the subway rail vehicle oil pressure shock absorber sealing ring shrinkage installation tool and method described in the present invention have the following advantages: In the shrinking installation tool and method for the sealing ring of the oil pressure shock absorber of the subway rail vehicle provided by the present invention, since the small end of the guide sleeve is used to be inserted into the inner hole of the guide seat, and the large end of the tapered hole of the guide sleeve is upward; the sealing ring is placed in the tapered hole of the guide sleeve, and the round mouth end of the sealing ring is downward; the push rod is used to press the sealing ring into the groove where the O-ring is located; the leveling mandrel is used to insert the sealing ring and expand and level the sealing ring, so the installation tool is simple and effective to operate, and there is no need to bend the sealing ring, so that the oil leakage failure of the shock absorber can be effectively avoided, thereby effectively improving the physical reliability, and can effectively improve the assembly efficiency and reduce the quality risk. In other words, the shrinking installation tool and method for the sealing ring of the oil pressure shock absorber of the subway rail vehicle provided by the present invention improves the existing sealing ring bending assembly method into a shrinking installation method, thereby effectively avoiding the bending marks generated by the sealing ring during the bending process, thereby effectively improving the quality of the installed sealing ring and significantly improving the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic structural diagram of a guide sleeve in a shrink installation tool for a sealing ring of an oil pressure shock absorber for a subway rail vehicle provided by an embodiment of the present invention; Figure 2 A schematic diagram of the structure of a push rod in a shrinking installation tool for a sealing ring of an oil pressure shock absorber for a subway rail vehicle provided by an embodiment of the present invention; Figure 3 A schematic structural diagram of a leveling mandrel in a shrinking installation tool for a sealing ring of an oil pressure shock absorber for a subway rail vehicle provided in an embodiment of the present invention.

[0015] Reference numerals: 1-guide sleeve; 10-taper hole; 11-guide sleeve body; 12-introduction section; 121-wedge-shaped portion; 122-straight tube portion; 120-straight hole; 2-push rod; 21-cylinder; 22-exhaust channel; 3-leveling mandrel; 31-cylindrical section; 32-wedge section; 4-guide seat; 5-sealing ring; 6-O-ring. DETAILED DESCRIPTION

[0016] In the prior art, since the sealing ring is made of PTFE (polytetrafluoroethylene), it cannot bend like rubber when installed in a closed groove. If it is bent into a kidney shape before installation, it cannot be guaranteed that the bending marks will be 100% eliminated after flattening.

[0017] For ease of understanding, the shrinking installation tool and method for the sealing ring of the oil pressure shock absorber of a subway rail vehicle provided by the embodiments of the present invention are described in detail below in conjunction with the accompanying drawings of the specification.

[0018] The embodiment of the present invention provides a shrinking installation tool for a sealing ring of an oil pressure shock absorber of a subway rail vehicle, such as Figure 1-Figure 3 As shown, it includes: a guide sleeve 1 with an inner taper, a push rod 2, and a leveling mandrel 3; The small end of the guide sleeve 1 is used to be inserted into the inner hole of the guide seat 4, and the large end of the tapered hole of the guide sleeve 1 is upward; the sealing ring 5 is placed in the tapered hole of the guide sleeve 1, and the round end of the sealing ring 5 is downward; The push rod 2 is used to press the sealing ring 5 into the groove where the O-ring 6 is located; The flattening mandrel 3 is used to be inserted into the sealing ring 5 and to expand and flatten the sealing ring 5 .

[0019] The embodiment of the present invention further provides a method for shrinking and installing a sealing ring of an oil pressure shock absorber of a subway rail vehicle, comprising the following steps: Install the O-ring 6 into the groove of the guide seat 4; Pass the sealing ring 5 through the guide sleeve 1 with an inner taper, and use the push rod 2 to press it into the groove of the guide seat 4; Use the leveling mandrel 3 to carry out the extended leveling.

[0020] Compared with the prior art, the shrinking installation tool and method for the sealing ring of the oil pressure shock absorber of a subway rail vehicle described in the embodiment of the present invention have the following advantages: In the shrinking installation tool and method for the sealing ring of the oil-pressure shock absorber of the subway rail vehicle provided by the embodiment of the present invention, since the small end of the guide sleeve 1 is used to be inserted into the inner hole of the guide seat 4, and the large end of the tapered hole of the guide sleeve 1 is upward; the sealing ring 5 is placed in the tapered hole of the guide sleeve 1, and the round end of the sealing ring 5 is downward; the push rod 2 is used to press the sealing ring 5 into the groove where the O-ring 6 is located; the leveling mandrel 3 is used to insert the sealing ring 5 and expand and level the sealing ring 5, so the installation tool is simple and effective to operate, and there is no need to bend the sealing ring, so that the oil leakage failure of the shock absorber can be effectively avoided, thereby effectively improving the physical reliability, and can effectively improve the assembly efficiency and reduce the quality risk. In other words, the shrinking installation tool and method for the sealing ring of the oil-pressure shock absorber of the subway rail vehicle provided by the embodiment of the present invention improves the existing sealing ring bending assembly method into a shrinking installation method, thereby effectively avoiding the bending marks generated by the sealing ring during the bending process, thereby effectively improving the quality of the installed sealing ring and significantly improving the production efficiency.

[0021] Among them, Figure 1-Figure 3 As shown, the guide sleeve 1 with an inner taper may include: a guide sleeve body 11 with a tapered hole 10, and an introduction section 12 integrally formed with the guide sleeve body 11, and the introduction section 12 is located at the small end of the tapered hole 10 of the guide sleeve 1; The introduction section 12 may include a wedge-shaped portion 121 connected to the guide sleeve body 11 , and a straight tube portion 122 connected to the wedge-shaped portion 121 ; the wedge-shaped portion 121 is in the same direction as the tapered hole 10 of the guide sleeve 1 , and the straight tube portion 122 has a straight hole 120 .

[0022] Specifically, Figure 1-Figure 3 As shown, the push rod 2 may be a cylinder 21 , and an exhaust passage 22 is provided at the bottom center of the cylinder 21 .

[0023] Furthermore, if Figure 1-Figure 3 As shown, the above-mentioned leveling mandrel 3 may include: a cylindrical section 31, and a wedge-shaped section 32 integrally formed with the cylindrical section 31, and the wedge-shaped section 32 is arranged toward the axial direction.

[0024] In practical application, such as Figure 1-Figure 3 As shown, the sealing ring 5 is passed through the guide sleeve 1 having an inner taper and is pressed into the groove of the guide seat 4 by the push rod 2, which may specifically include the following steps: Insert the small end of the guide sleeve 1 into the inner hole of the guide seat 4, with the large end of the tapered hole 10 of the guide sleeve 1 facing upward; put the sealing ring 5 into the tapered hole 10 of the guide sleeve 1, with the round end of the sealing ring 5 facing downward; Use the push rod 2 to press the sealing ring 5 into the groove where the O-ring 6 is located; Remove push rod 2.

[0025] Among them, Figure 1-Figure 3 As shown, the above-mentioned use of the leveling mandrel 3 for expansion and leveling may specifically include the following steps: Use the leveling mandrel 3 to insert it into the sealing ring 5 for 3-4 times, and expand and level the sealing ring 5.

[0026] In summary, the shrinking installation tool and method for the sealing ring of the oil pressure shock absorber of a subway rail vehicle provided by the embodiment of the present invention mainly have the following advantages: 1. The sealing ring does not need to be bent, thus avoiding the generation of bending marks; 2. The use of guide sleeves, push rods and leveling mandrels can effectively improve production efficiency.

[0027] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A shrinking installation tool for a sealing ring of a hydraulic shock absorber of a subway rail vehicle, characterized in that: include: Guide bushings, push rods, and leveling mandrels with internal tapers; The small end of the guide sleeve is used to be inserted into the inner hole of the guide seat, and the large end of the tapered hole of the guide sleeve is upward; the sealing ring is placed in the tapered hole of the guide sleeve, and the round end of the sealing ring is downward; The push rod is used to press the sealing ring into the groove where the O-ring is located; The flattening mandrel is used for inserting into the sealing ring and expanding and flattening the sealing ring.

2. The shrinking installation tool for the sealing ring of the oil pressure shock absorber of a subway rail vehicle according to claim 1 is characterized in that: The guide sleeve with an inner taper comprises: a guide sleeve body with a tapered hole, and an introduction section integrally formed with the guide sleeve body, and the introduction section is located at the small end of the tapered hole of the guide sleeve; The introduction section comprises: a wedge-shaped portion connected to the guide sleeve body, and a straight tube portion connected to the wedge-shaped portion; the wedge-shaped portion and the tapered hole of the guide sleeve are in the same direction, and the straight tube portion has a straight hole.

3. The shrinking installation tool for the sealing ring of the oil pressure shock absorber of a subway rail vehicle according to claim 1 is characterized in that: The push rod is a cylinder, and an exhaust passage is provided at the bottom center of the cylinder.

4. The shrinking installation tool for the sealing ring of the oil pressure shock absorber of a subway rail vehicle according to claim 1 is characterized in that: The leveling mandrel comprises: a cylindrical section and a wedge-shaped section integrally formed with the cylindrical section, and the wedge-shaped section is arranged toward the axial direction.

5. A shrinkage installation method for a sealing ring of a hydraulic shock absorber of a subway rail vehicle, characterized in that: The following steps are involved: Install the O-ring into the guide seat groove; Pass the sealing ring through the guide sleeve with an inner taper and press it into the guide seat groove using a push rod; Use a leveling mandrel for extended leveling.

6. The shrinkage installation method for the sealing ring of the oil pressure shock absorber of a subway rail vehicle according to claim 5 is characterized in that: The sealing ring is passed through a guide sleeve having an inner taper and pressed into the guide seat groove using a push rod, specifically comprising the following steps: Insert the small end of the guide sleeve into the inner hole of the guide seat, with the large end of the tapered hole of the guide sleeve facing upward; put the sealing ring into the tapered hole of the guide sleeve, with the round end of the sealing ring facing downward; Use a push rod to press the sealing ring into the groove where the O-ring is located; Remove the push rod.

7. The shrinkage installation method for the sealing ring of the oil pressure shock absorber of a subway rail vehicle according to claim 6 is characterized in that: The use of the leveling mandrel for extended leveling specifically includes the following steps: Use a leveling mandrel to insert it into the sealing ring 3-4 times to expand and level the sealing ring.

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