Special assembly tool for hydraulic piston type valve sealing ring

Abstract

The utility model relates to a special assembly tool for a hydraulic piston type valve sealing ring, which comprises a ring pushing plate, a gap bridge cone and a fixing plate, the ring pushing plate and the fixing plate are respectively arranged on two sides of a three-way valve piston, the gap bridge cone is sleeved on a piston rod on one side of the three-way valve piston towards the ring pushing plate, and a contraction pushing ring is arranged on one side of the ring pushing plate towards the three-way valve piston. When the distance between the push ring plate and the fixing plate is shortened, the end of the contraction push ring abuts against the sealing ring to move in the expanding direction of the gap bridge cone, and the contraction push ring and the sealing ring expand synchronously. The sealing device has the advantages that the push ring plate pushes the sealing ring through the contraction push ring which expands synchronously with the sealing ring, the gap bridge cone serves as a guide structure for moving and expanding of the sealing ring, the sealing ring can expand slowly and finally slide into the sealing groove, labor and time are saved, and damage to the sealing ring is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and in particular comprises a special assembly tool for a sealing ring of a hydraulic piston valve. Background Art

[0002] The actuator of the inlet and outlet three-way valve of the fourth phase of the power plant is a three-way structure of a hydraulic cylinder with a piston. The hydraulic cylinder piston seal needs to be replaced every time it is dismantled and overhauled. The piston seal is special, and the outer ring material of the upper and lower seals of the piston is a RULON (polytetrafluoroethylene polymer) polymer material with a low expansion coefficient and small deformation. Even if the piston outer ring is immersed in nearly 200°C oil and heated during installation, the RULON material has a small expansion volume and still cannot be placed intact in the concave sealing groove of the piston. For this reason, the existing technology can only use some temporary methods for installation. Through some simple tools, it is forcibly pried into the sealing groove of the piston, thereby causing damage to the sealing ring, resulting in deformation or damage of the sealing ring, greatly reducing the sealing effect, causing the upper and lower chambers of the piston to pass through, and ultimately making the high-pressure three-way valve unable to operate normally.

[0003] In order to solve the problem that the piston sealing ring is difficult to install and easy to cause damage to the sealing ring, a special tooling for assembling the piston sealing ring of the high-pressure three-way valve is urgently needed, so that the piston sealing ring can be installed in place without damage, saving time and effort. Utility Model Content

[0004] The utility model aims to overcome the deficiencies in the prior art and provide a special assembly tool for a sealing ring of a hydraulic piston valve.

[0005] The special assembly tool for the sealing ring of a hydraulic piston valve comprises: a push ring plate, a bridge cone and a fixed plate, wherein the push ring plate and the fixed plate are respectively arranged on both sides of the three-way valve piston, and the piston rod of the three-way valve piston facing the push ring plate is sleeved with a bridge cone, and the two ends of the bridge cone are respectively a small end and a large end, and the large end fits with the end of the three-way valve piston;

[0006] A shrinking push ring is provided on the side of the push ring plate facing the piston of the three-way valve, and the end of the shrinking push ring is supported on one side of the sealing ring. The push ring plate and the fixed plate are tightened and pulled closer by a tightening screw; when the distance between the push ring plate and the fixed plate is reduced, the end of the shrinking push ring pushes the sealing ring and moves in the direction of the expansion of the bridge cone, and the shrinking push ring and the sealing ring expand synchronously.

[0007] Preferably, the diameter of the large end of the bridge cone matches the diameter of the end of the three-way valve piston, and the diameter of the small end is smaller than the inner diameter of the sealing ring.

[0008] Preferably, the depth of the shrink push ring is greater than or equal to the distance from the small end of the bridge cone to the sealing groove of the three-way valve piston.

[0009] Preferably, the push ring plate and the fixed plate are both provided with a through hole for the tightening screw, one end of the tightening screw is provided with a screw head, and the other end is provided with a thread of a certain length. One end of the screw head of the tightening screw is passed through the push ring plate, and one end of the thread passes through the fixed plate and is fixed by a tightening nut. The length of the thread is greater than or equal to the distance from the small head of the bridge cone to the sealing groove of the three-way valve piston.

[0010] Preferably, when a rounded corner is provided at the end of the three-way valve piston, the large end of the bridge cone covers the rounded corner, and the outer surface of the large end of the bridge cone is continuous with the outer surface of the three-way valve piston.

[0011] The beneficial effects of the utility model are:

[0012] 1) The utility model proposes a special assembly tool, in which the push ring plate pushes the sealing ring through the contraction push ring that expands synchronously with the sealing ring, and the bridge cone is used as a guide structure for the movement and expansion of the sealing ring, so that the sealing ring can expand slowly and finally slide into the sealing groove, which saves effort and time and does not cause damage to the sealing ring.

[0013] 2) The utility model connects the push ring plate and the fixed plate by tightening the screw rod, and adjusts the distance between the push ring plate and the fixed plate by tightening the nut, thereby controlling the speed of the shrinking push ring to push the sealing ring, and facilitating the control of the uniform expansion of the sealing ring in all directions, effectively reducing the probability of damage to the sealing ring during installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional structural diagram of a special assembly tool for a hydraulic piston valve sealing ring;

[0015] Figure 2 for Figure 1 Schematic diagram of the structure of area A in the middle.

[0016] Explanation of the reference numerals: three-way valve piston 1, push ring plate 2, contraction push ring 3, bridge cone 4, sealing ring 5, fixing plate 6, tightening screw 7, tightening nut 8, sealing groove 11, piston rod 12. DETAILED DESCRIPTION

[0017] The utility model is further described below in conjunction with the embodiments. The description of the following embodiments is only used to help understand the utility model. It should be pointed out that for ordinary people in this technical field, the utility model can also be modified in some ways without departing from the principle of the utility model, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

[0018] As an example, Figure 1 and Figure 2As shown, this special assembly tool for sealing ring of hydraulic piston valve includes: a push ring plate 2, a bridge cone 4 and a fixed plate 6. The three-way valve piston 1 is provided with two sealing grooves 11. The push ring plate 2 and the fixed plate 6 are respectively provided at both ends of the three-way valve piston 1. The piston rod 12 of the three-way valve piston 1 facing the push ring plate 2 is sleeved with a bridge cone 4. The two ends of the bridge cone 4 are respectively a small end and a large end. The diameter of the large end of the bridge cone 4 matches the diameter of the end of the three-way valve piston 1, and the diameter of the small end is smaller than the inner diameter of the sealing ring 5. The push ring plate 2 and the fixed plate 6 are both provided with openings matching the diameter of the piston rod 12 for the piston rod 12 to pass through.

[0019] like Figure 2 As shown, the big head fits with the end of the three-way valve piston 1. When the end of the three-way valve piston 1 is rounded, the big head of the bridge cone 4 covers the rounded corner, so that the outer surface of the big head of the bridge cone 4 and the outer surface of the three-way valve piston 1 are continuous, and the gap is controlled to be 0.5 to 0.8 mm so as not to affect the installation accuracy of the sealing ring 5. The axial length of the bridge cone 4 can ensure that the inner diameter of the sealing ring 5 has the smallest possible deformation when the sealing ring 5 is installed.

[0020] A shrink push ring 3 is provided on the side of the push ring plate 2 facing the three-way valve piston 1. The end of the shrink push ring 3 is supported on one side of the sealing ring 5. The shrink push ring 3 has a certain hardness and can freely shrink and expand within a certain size range. The thickness of the shrink push ring 3 ring tube is consistent with the inner and outer diameters of the sealing ring 5. The shrink push ring 3 is cut by a certain amount of wire so that it can shrink and expand freely with the bridge cone 4. The shrink push ring 3 evenly pushes the sealing ring 5 and slowly moves along the bridge cone 4 to the outer surface of the three-way valve piston 1, and finally slides into the sealing groove 11 to tighten, which saves effort and time without causing damage to the sealing ring.

[0021] The depth of the shrink push ring 3 is greater than or equal to the distance from the small end of the bridge cone 4 to the sealing groove 11 of the three-way valve piston 1, so that the travel length of the shrink push ring 3 is sufficient to push the sealing ring 5 into the sealing groove 11.

[0022] The push ring plate 2 and the fixed plate 6 are tightened and pulled together by the tensioning screw 7; the push ring plate 2 and the fixed plate 6 are both provided with through holes for the tensioning screw 7, one end of the tensioning screw 7 is provided with a screw head, and the other end is provided with a thread of a certain length, one end of the screw head of the tensioning screw 7 is passed through the push ring plate 2, and one end of the thread passes through the fixed plate 6 and is fixed by the tensioning nut 8, the axial length of the tensioning screw 7 and the length of the thread are determined by the length of the shrink push ring 3, the bridge cone 4, the fixed plate 6, and the three-way valve piston 1, and the screw diameter is designed according to the thrust of the installation sealing ring 5 and the need for a safety margin. The thread length is greater than or equal to the distance from the small end of the bridge cone 4 to the sealing groove 11 of the three-way valve piston 1.

[0023] When the tensioning nut 8 rotates continuously, the distance between the push ring plate 2 and the fixed plate 6 is reduced, and the end of the shrink push ring 3 pushes the sealing ring 5 and moves in the direction of the expansion of the bridge cone 4. The shrink push ring 3 and the sealing ring 5 expand synchronously, and the bridge cone 4 gradually inserts into the shrink push ring 3. By controlling the rotation speed of the tensioning nut 8, the speed at which the shrink push ring 3 pushes the sealing ring 5 can be adjusted, and the expansion speed of the sealing ring 5 can be controlled within a certain range to prevent the sealing ring from being deformed or damaged due to excessive force changes.

[0024] After completing the installation of the sealing ring 5 on one sealing groove 11, remove the tightening screw 7 and the tightening nut 8 to separate the push ring plate 2 and the fixing plate 6, and then symmetrically replace them to the other end of the three-way valve piston 1 and reinstall them. The same method can be used to install the sealing ring 5 at the sealing groove 11 on the other side of the three-way valve piston 1.

Claims

1. A special assembly tool for a hydraulic piston valve sealing ring, characterized in that: include: A push ring plate, a bridge cone and a fixed plate, wherein the push ring plate and the fixed plate are respectively arranged on both sides of the three-way valve piston, and a bridge cone is sleeved on the piston rod of the three-way valve piston on the side facing the push ring plate, and the two ends of the bridge cone are respectively a small end and a large end, and the large end fits with the end of the three-way valve piston; A shrinking push ring is provided on the side of the push ring plate facing the piston of the three-way valve, and the end of the shrinking push ring is supported on one side of the sealing ring. The push ring plate and the fixed plate are tightened and pulled closer by a tightening screw; when the distance between the push ring plate and the fixed plate is reduced, the end of the shrinking push ring pushes the sealing ring and moves in the direction of the expansion of the bridge cone, and the shrinking push ring and the sealing ring expand synchronously.

2. The special assembly tool for the sealing ring of a hydraulic piston valve according to claim 1 is characterized in that: The diameter of the large end of the bridge cone matches the diameter of the end of the piston of the three-way valve, and the diameter of the small end is smaller than the inner diameter of the sealing ring.

3. The special assembly tool for the sealing ring of a hydraulic piston valve according to claim 1 is characterized in that: The depth of the shrink push ring is greater than or equal to the distance from the small end of the bridge cone to the sealing groove of the three-way valve piston.

4. The special assembly tool for the sealing ring of a hydraulic piston valve according to claim 1 is characterized in that: The push ring plate and the fixed plate are both provided with through holes for the tightening screw, one end of the tightening screw is provided with a screw head, and the other end is provided with a thread of a certain length. One end of the screw head of the tightening screw is passed through the push ring plate, and one end of the thread passes through the fixed plate and is fixed by a tightening nut. The length of the thread is greater than or equal to the distance from the small end of the bridge cone to the sealing groove of the piston of the three-way valve.

5. The special assembly tool for the sealing ring of a hydraulic piston valve according to claim 1, characterized in that: When a rounded corner is set at the end of the three-way valve piston, the large end of the bridge cone covers the rounded corner, and the outer surface of the large end of the bridge cone is continuous with the outer surface of the three-way valve piston.

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