Shape memory polymer-based sealing element lossless assembly component and assembly method

Abstract

The invention belongs to the field of actuator assembly, and relates to a sealing element lossless assembly component based on shape memory polymer and an assembly method. The sealing element lossless assembling assembly comprises a polymer tool, a barrel annular groove and a square hole penetrating through the bottom of the barrel annular groove, the material of the polymer tool is formed by compounding a resin monomer, a cross-linking agent and a flexible agent, the polymer tool is a whole circle with a notch, the cross section of the polymer tool is rectangular, and the diameter of the inner arc surface of the polymer tool is smaller than or equal to that of the inner wall of an actuator barrel; the diameter of the outer arc surface is the same as the bottom diameter of the annular groove of the actuator cylinder; the width w of the inner arc surface of the polymer tool is smaller than or equal to the width of the annular groove of the actuator cylinder; the height h of the inner arc surface of the polymer tool is the same as the height of the annular groove of the actuator cylinder; two edges of the inner arc surface of the polymer tool are designed to be rounded R, and the value is 0.5 mm; the deformation transformation temperature of the shape memory composite material of the polymer tool is 60 + / -5 DEG C; and a square or circular hole is formed in the end part of the polymer tool.

Description

Technical Field

[0001] The invention belongs to the field of actuator assembly, and relates to a seal non-destructive assembly component and an assembly method based on shape memory polymer. Background Art

[0002] There is an annular groove 2 with a rectangular cross section on the inner wall of the isolation section between the hydraulic dual redundant actuators. The bottom of the annular groove 2 has two symmetrical square holes 3 that penetrate the inner wall of the actuator cylinder. Figure 1 When the piston assembly is assembled into the cylinder of the actuator, the piston will pass through the annular groove 2. Since the surface of the sealing ring installed on the piston is slightly higher than the outer cylindrical surface of the piston, the edge of the annular groove 2 can easily scratch or even cut the sealing ring during assembly. A scratched sealing ring will affect its sealing performance and reduce the service life of the actuator. If the sealing ring is cut, it must be reassembled, which not only causes waste but also reduces assembly efficiency.

[0003] The conventional processing method is: use a circular ring composed of 4 to 6 segments of circular arc parts with the same structure, the cross section of the circular arc parts is T-shaped; there are threading holes at one or both ends of the outer circular arc segments of the circular arc parts that axially penetrate the outer circular arc segments. Pass a thin rope through the threading holes of the circular arc parts and tie a knot, install the circular ring composed of the circular arc parts into the annular groove in the actuator cylinder to form a circular ring, and pull the thin rope out from the square hole that penetrates the inner wall of the actuator cylinder. Since the inner arc surface of the inner circular arc segment of the circular arc part is coplanar with the inner wall of the actuator cylinder, when the piston assembly passes through the annular groove, the sealing ring installed on the piston assembly will not be scratched by the edges of the annular groove. After the piston assembly passes through the annular groove, pull the thin rope to pull the circular arc parts out of the square holes one by one.

[0004] However, this method has the disadvantage that it takes a long time to arrange the strings when installing the arc parts. For example, for four arc parts, at least four strings need to be properly pulled out from the square hole that passes through the inner wall of the actuator cylinder, and they must not be exposed in the cavity where the piston assembly passes. Otherwise, there is a risk that the strings may be cut by the piston assembly and become redundant parts of the hydraulic product. In addition, since the space of the annular groove becomes smaller after the piston assembly passes through the annular groove, it is time-consuming to pull the strings to pull the arc parts out of the square holes one by one, and the production efficiency is low. Summary of the invention

[0005] Purpose of the invention: To provide a non-destructive assembly component and assembly method of a seal based on a shape memory polymer, so as to avoid scratching the sealing ring of the actuator piston assembly and the actuator cylinder during assembly.

[0006] Technical solution:

[0007] A non-destructive assembly assembly of a seal based on a shape memory polymer comprises: a polymer tooling 1, a cylinder annular groove 2 arranged on an actuator cylinder, and a square hole 3 penetrating the bottom of the cylinder annular groove 2, wherein:

[0008] The material of the polymer tooling 1 is a compound of a resin monomer, a cross-linking agent, and a flexible agent. The polymer tooling 1 is a whole circle with a cutout, and the cross-sectional shape is a rectangle. The diameter of the inner arc surface is less than or equal to the diameter of the inner wall of the actuator cylinder; the diameter of the outer arc surface is the same as the bottom diameter of the annular groove 2 of the actuator cylinder;

[0009] The width w of the inner arc surface of the polymer tooling 1 is less than or equal to the width of the annular groove 2 of the actuator cylinder; the height h of the inner arc surface of the polymer tooling 1 is the same as the height of the annular groove 2 of the actuator cylinder; the two edges of the inner arc surface of the polymer tooling 1 are designed to be rounded R, with a value of 0.5 mm; the deformation transition temperature of the shape memory composite material of the polymer tooling 1 is 60±5°C;

[0010] The polymer tooling 1 is provided with a square or circular hole at the end thereof for connecting a strip of metal or non-metal material. After the polymer tooling 1 is softened, the strip is pulled out of the polymer tooling 1 .

[0011] Preferably, the diameter of the inner arc surface of the polymer tooling 1 is 0.5 mm smaller than the diameter of the inner wall of the actuator cylinder.

[0012] Preferably, the width of the inner arc surface of the polymer tooling 1 is 0.8 mm smaller than the width of the annular groove 2 of the actuator cylinder.

[0013] Preferably, the two edges of the outer arc surface of the polymer tooling 1 are chamfered by 1.5 mm×45°.

[0014] Preferably, the incision angle of the polymer tooling 1 is 45° to 90° with the end surface 1a of the polymer tooling.

[0015] A method for non-destructive assembly of a seal based on a shape memory polymer, the method being performed by means of the above-mentioned non-destructive assembly component for the seal, the method comprising:

[0016] Step 1: Clean the inner hole of the cylinder and apply grease in the annular groove 2 of the cylinder;

[0017] Step 2: Install the polymer tooling 1 into the annular groove 2 of the cylinder from the cylinder opening;

[0018] Step 3: Rotate the polymer tool 1 and align its cutout with the square hole 3;

[0019] Step 4: Install the piston assembly on the cylinder, observe from the window that the seal passes through the annular groove 2 of the cylinder, heat the polymer tooling to soften it, and use a tool to clamp the polymer tooling 1 and pull it out from the square hole 3.

[0020] Preferably, in step 4, the polymer tooling is heated to soften it, and a tool is used to clamp and pull the polymer tooling 1 out of the square hole 3, specifically:

[0021] A thermal resistance wire is embedded in the polymer tooling 1 or a thermal resistance tape is adhered to the surface, and current is applied to the thermal resistance wire to generate heat. After the polymer tooling 1 softens, the polymer tooling 1 is pulled out by a pulling strip or the polymer tooling 1 is clamped and pulled out using a tool.

[0022] Preferably, in step 4, the polymer tooling is heated to soften it, and a tool is used to clamp and pull the polymer tooling 1 out of the square hole 3, specifically:

[0023] The hot air gun is set to a temperature higher than the transformation temperature of the shape memory composite material, and the polymer tooling 1 is heated from the square hole 3. After the polymer tooling 1 is softened, the polymer tooling 1 is clamped and pulled out using a tool.

[0024] Preferably, in step 4, the polymer tooling is heated to soften it, and a tool is used to clamp and pull the polymer tooling 1 out of the square hole 3, specifically:

[0025] A water-based liquid medium with a temperature higher than the transition temperature of the shape memory composite material is continuously poured into the annular groove 2 of the actuator cylinder from the square hole 3 that passes through the inner wall of the actuator cylinder. After the polymer tooling 1 softens, a tool is used to clamp the polymer tooling 1 and pull it out from the square hole 3.

[0026] Preferably, in step 4, the polymer tooling is heated to soften it, and a tool is used to clamp and pull the polymer tooling 1 out of the square hole 3, specifically:

[0027] A high-temperature material is used to wrap the outside of the annular groove 2 of the actuator cylinder so that its heat is conducted to the polymer tooling 1 through the metal of the cylinder wall. After the polymer tooling 1 softens, a tool is used to clamp the polymer tooling 1 and pull it out from the square hole 3.

[0028] Beneficial effects:

[0029] The shape memory polymer-based seal non-destructive assembly component and assembly method of the present invention can prevent the actuator piston assembly and the actuator cylinder from scratching the sealing ring during assembly, and the shape memory polymer-based seal non-destructive assembly component has the characteristics of easy processing, high forming accuracy, simple operation, reusability and high reliability. The assembly method of the present invention avoids the problem of cutting the sealing ring during assembly of the hydraulic actuator piston assembly and the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. It is obvious that the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 Schematic diagram of polymer tooling.

[0032] Figure 2 Schematic diagram of the seal non-destructive assembly components.

[0033] Description of reference numerals:

[0034] 1-polymer tooling, 2-cylinder annular groove, 3-square hole, w-width, h-height, R-rounding. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 work are within the scope of protection of the present invention.

[0036] The features and illustrative embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is by no means limited to any specific settings and methods proposed below, but covers any improvements, replacements and modifications of structures, methods, devices without departing from the spirit of the present invention. In the accompanying drawings and the following description, known structures and technologies are not shown to avoid unnecessary ambiguity in the present invention.

[0037] In the description of the present invention, it is necessary to understand that the terms "center", "axial", "vertical", "up", "down", "upper end", "bottom end", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0038] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other, and the embodiments can refer to and quote each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0039] In a first aspect, the present invention provides a non-destructive assembly component for a seal based on a shape memory polymer.

[0040] like Figure 1-2 A non-destructive assembly assembly of a seal based on a shape memory polymer comprises: a polymer tooling 1, a cylinder annular groove 2 arranged on the cylinder of an actuator, and a square hole 3 passing through the bottom of the cylinder annular groove 2, wherein:

[0041] The material of the polymer tooling 1 is a compound of a resin monomer, a cross-linking agent, and a flexible agent. The polymer tooling 1 is a whole circle with a cutout, and the cross-sectional shape is a rectangle. The diameter of the inner arc surface is less than or equal to the diameter of the inner wall of the actuator cylinder; the diameter of the outer arc surface is the same as the bottom diameter of the annular groove 2 of the actuator cylinder;

[0042] The width w of the inner arc surface of the polymer tooling 1 is less than or equal to the width of the annular groove 2 of the actuator cylinder; the height h of the inner arc surface of the polymer tooling 1 is the same as the height of the annular groove 2 of the actuator cylinder; the two edges of the inner arc surface of the polymer tooling 1 are designed to be chamfered R with a value of 0.5mm; the deformation transition temperature of the shape memory composite material of the polymer tooling 1 is 60±5℃; at this temperature, the shape memory composite material has sufficient softening ability and can maintain a certain flexibility to be smoothly removed from the square hole of the actuator cylinder.

[0043] In a possible embodiment, the shape memory composite material of the polymer tooling 1 can be added with high-strain fiber fabrics, and different types of fabric structures can obtain shape memory composite materials with different mechanical strengths and deformation capabilities.

[0044] After the polymer tooling 1 is taken out of the actuator after thermal deformation and softening, it can be put back into the shape memory mold for secondary molding. The polymer tooling after secondary molding has the same shape, dimensional accuracy, mechanical properties, shape memory properties, and thermomechanical properties as the first molding.

[0045] The polymer tooling 1 can be shaped and used multiple times.

[0046] When the polymer tooling 1 is installed in the annular groove 2 of the actuator cylinder, a proper amount of grease or the like can be applied to reduce the friction when removing it.

[0047] The polymer tooling 1 is provided with a square or circular hole at the end thereof for connecting a strip of metal or non-metal material. After the polymer tooling 1 is softened, the strip is pulled out of the polymer tooling 1 .

[0048] In a possible embodiment, the diameter of the inner arc surface of the polymer tooling 1 is 0.5 mm smaller than the diameter of the inner wall of the actuator cylinder.

[0049] In a possible embodiment, the width of the inner arc surface of the polymer tooling 1 is 0.8 mm smaller than the width of the annular groove 2 of the actuator cylinder. (The width of the sealing ring retaining ring is 1.15 mm, which is larger than 0.8 mm, so the sealing ring retaining ring will not fall into the gap).

[0050] In a possible embodiment, the chamfers of two edges of the outer arc surface of the polymer tooling 1 are 1.5 mm×45°.

[0051] In a possible embodiment, the cut angle of the polymer tooling 1 is 45° to 90° with the end surface 1a of the polymer tooling.

[0052] In a possible embodiment, the polymer tooling 1 may be a circular ring formed by 2 to 4 circular arc pieces with the same structure.

[0053] In a possible embodiment, the polymer tooling 1 may be designed with a boss, an extended end, etc. that facilitates clamping.

[0054] The material of the polymer tooling 1 is a compound of resin monomer, cross-linking agent, flexibility agent, etc., to synthesize a shape memory material that meets the requirements of specific working conditions.

[0055] In a second aspect, the present invention provides a method for non-destructive assembly of a seal based on a shape memory polymer, wherein the method is performed with the aid of the above-mentioned non-destructive assembly component for the seal.

[0056] Embodiment 1:

[0057] A non-destructive assembly method for a seal based on a shape memory polymer, comprising:

[0058] Step 1: Clean the inner hole of the cylinder and apply grease in the annular groove 2 of the cylinder;

[0059] Step 2: Install the polymer tooling 1 into the annular groove 2 of the cylinder from the cylinder opening;

[0060] Step 3: Rotate the polymer tool 1 and align its cutout with the square hole 3;

[0061] Step 4: Install the piston assembly on the cylinder, observe from the window that the seal passes through the annular groove 2 of the cylinder, heat the polymer tooling to soften it, and use a tool to clamp the polymer tooling 1 and pull it out from the square hole 3.

[0062] Embodiment 2:

[0063] Step 1: Clean the inner hole of the cylinder and apply grease in the annular groove 2 of the cylinder;

[0064] Step 2: Install the polymer tooling 1 into the annular groove 2 of the cylinder from the cylinder opening;

[0065] Step 3: Rotate the polymer tool 1 and align its cutout with the square hole 3;

[0066] In step 4, a thermal resistance wire is embedded in the polymer tooling 1 or a thermal resistance tape is adhered to the surface, the piston assembly is installed on the cylinder, and after observing the seal passing through the annular groove 2 of the cylinder through the window, current is applied to the thermal resistance wire to generate heat. After the polymer tooling 1 softens, the polymer tooling 1 is pulled out with a traction strip or the polymer tooling 1 is clamped and pulled out using a tool.

[0067] Embodiment 3:

[0068] A non-destructive assembly method for a seal based on a shape memory polymer, comprising:

[0069] Step 1: Clean the inner hole of the cylinder and apply grease in the annular groove 2 of the cylinder;

[0070] Step 2: Install the polymer tooling 1 into the annular groove 2 of the cylinder from the cylinder opening;

[0071] Step 3: Rotate the polymer tool 1 and align its cutout with the square hole 3;

[0072] Step 4: Install the piston assembly on the cylinder and observe from the window that the seal passes through the cylinder annular groove 2.

[0073] The hot air gun is set to a temperature higher than the transformation temperature of the shape memory composite material, and the polymer tooling 1 is heated from the square hole 3. After the polymer tooling 1 is softened, the polymer tooling 1 is clamped and pulled out using a tool.

[0074] Embodiment 4:

[0075] A non-destructive assembly method for a seal based on a shape memory polymer, comprising:

[0076] Step 1: Clean the inner hole of the cylinder and apply grease in the annular groove 2 of the cylinder;

[0077] Step 2: Install the polymer tooling 1 into the annular groove 2 of the cylinder from the cylinder opening;

[0078] Step 3: Rotate the polymer tool 1 and align its cutout with the square hole 3;

[0079] Step 4: Install the piston assembly on the cylinder, observe from the window that the seal passes through the annular groove 2 of the cylinder, and use a water-based liquid medium with a temperature higher than the transition temperature of the shape memory composite material to continuously pour it into the annular groove 2 of the actuator cylinder from the square hole 3 that passes through the inner wall of the actuator cylinder. After the polymer tooling 1 softens, use a tool to clamp the polymer tooling 1 and pull it out from the square hole 3.

[0080] Embodiment 5:

[0081] A non-destructive assembly method for a seal based on a shape memory polymer, comprising:

[0082] Step 1: Clean the inner hole of the cylinder and apply grease in the annular groove 2 of the cylinder;

[0083] Step 2: Install the polymer tooling 1 into the annular groove 2 of the cylinder from the cylinder opening;

[0084] Step 3: Rotate the polymer tool 1 and align its cutout with the square hole 3;

[0085] Step 4: Install the piston assembly on the cylinder, observe from the window that the seal passes through the annular groove 2 of the cylinder, and then use high-temperature material to wrap the outside of the annular groove 2 of the actuator cylinder so that its heat is transferred to the polymer tooling 1 through the metal of the cylinder wall. After the polymer tooling 1 softens, use a tool to clamp the polymer tooling 1 and pull it out from the square hole 3.

[0086] Embodiment 6:

[0087] A non-destructive assembly method for a seal based on a shape memory polymer, comprising:

[0088] Step 1: Clean the inner hole of the cylinder and apply grease in the annular groove 2 of the cylinder;

[0089] Step 2: Install the polymer tooling 1 into the annular groove 2 of the cylinder from the cylinder opening;

[0090] Step 3: Rotate the polymer tool 1 and align its cutout with the square hole 3;

[0091] Step 4: Install the piston assembly on the cylinder, observe from the window that the seal passes through the annular groove 2 of the cylinder, then place the actuator cylinder, piston assembly, and polymer tooling as a whole in the oven, set the temperature, and after the set time is reached, take out the product. The polymer tooling 1 softens and is clamped with a tool to pull it out from the square hole 3.

[0092] The above-mentioned embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that the above-mentioned embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the art can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should be covered within the protection scope of the present invention.

Claims

1. A non-destructive assembly component for a seal based on a shape memory polymer, characterized in that: include: A polymer tool (1), a cylinder annular groove (2) arranged on the cylinder of an actuator, and a square hole (3) penetrating the bottom of the cylinder annular groove (2), wherein: The material of the polymer tooling (1) is a compound of a resin monomer, a cross-linking agent, and a flexibilizer. The polymer tooling (1) is a whole circle with a cutout, and the cross-sectional shape is a rectangle. The diameter of the inner arc surface is less than or equal to the diameter of the inner wall of the actuator cylinder; the diameter of the outer arc surface is the same as the bottom diameter of the annular groove (2) of the actuator cylinder. The width w of the inner arc surface of the polymer tooling (1) is less than or equal to the width of the annular groove (2) of the actuator cylinder; the height h of the inner arc surface of the polymer tooling (1) is the same as the height of the annular groove (2) of the actuator cylinder; the two edges of the inner arc surface of the polymer tooling (1) are designed to be chamfered R, with a value of 0.5 mm; the deformation transition temperature of the shape memory composite material of the polymer tooling (1) is 60±5°C; The polymer tooling (1) is provided with a square or circular hole at the end thereof for connecting a strip of metal or non-metal material. After the polymer tooling (1) is softened, the strip is pulled out of the polymer tooling (1).

2. The seal non-destructive assembly assembly according to claim 1, characterized in that: The diameter of the inner arc surface of the polymer tooling (1) is 0.5 mm smaller than the diameter of the inner wall of the actuator cylinder.

3. The seal non-destructive assembly assembly according to claim 1, characterized in that: The width of the inner arc surface of the polymer tooling (1) is 0.8 mm smaller than the width of the annular groove (2) of the actuator cylinder.

4. The seal non-destructive assembly assembly according to claim 1, characterized in that: The two edges of the outer arc surface of the polymer tooling (1) are chamfered at 1.5 mm×45°.

5. The seal non-destructive assembly assembly according to claim 1, characterized in that: The incision angle of the polymer tooling (1) is 45° to 90° with the end surface 1a of the polymer tooling.

6. A non-destructive assembly method for a seal based on a shape memory polymer, characterized in that: The method is performed by means of a seal non-destructive assembly assembly according to any one of claims 1 to 5, and the method comprises: Step 1: Clean the inner hole of the cylinder and apply grease to the annular groove (2) of the cylinder; Step 2: Install the polymer tooling (1) into the annular groove (2) of the cylinder from the opening of the cylinder; Step 3: Rotate the polymer tooling (1) to align its cutout with the square hole (3); Step 4: Install the piston assembly on the cylinder, observe from the window that the seal passes through the annular groove (2) of the cylinder, heat the polymer tooling to soften it, and use a tool to clamp the polymer tooling (1) and pull it out from the square hole (3).

7. The method for non-destructive assembly of a seal according to claim 6, characterized in that: In step 4, the polymer tooling is heated to soften it, and the polymer tooling (1) is clamped and pulled out from the square hole (3) using a tool, specifically: A thermal resistance wire is embedded in the polymer tooling (1) or a thermal resistance tape is adhered to the surface, and current is applied to the thermal resistance wire to generate heat. After the polymer tooling (1) softens, the polymer tooling (1) is pulled out by a traction strip or the polymer tooling (1) is clamped and pulled out using a tool.

8. The method for non-destructive assembly of a seal according to claim 6, characterized in that: In step 4, the polymer tooling is heated to soften it, and the polymer tooling (1) is clamped and pulled out from the square hole (3) using a tool, specifically: The heat gun is set to a temperature higher than the transformation temperature of the shape memory composite material, and the polymer tooling (1) is heated from the square hole (3). After the polymer tooling (1) is softened, the polymer tooling (1) is clamped and pulled out using a tool.

9. The method for non-destructive assembly of a seal according to claim 6, characterized in that: In step 4, the polymer tooling is heated to soften it, and the polymer tooling (1) is clamped and pulled out from the square hole (3) using a tool, specifically: A water-based liquid medium having a temperature higher than the transformation temperature of the shape memory composite material is continuously poured into the annular groove (2) of the actuator cylinder from a square hole (3) penetrating the inner wall of the actuator cylinder. After the polymer tooling (1) softens, a tool is used to clamp the polymer tooling (1) and pull it out from the square hole (3).

10. The method for non-destructive assembly of a seal according to claim 6, characterized in that: In step 4, the polymer tooling is heated to soften it, and the polymer tooling (1) is clamped and pulled out from the square hole (3) using a tool, specifically: A high-temperature material is used to wrap the outside of the annular groove (2) of the actuator cylinder, so that its heat is conducted to the polymer tooling (1) through the metal of the cylinder wall. After the polymer tooling (1) softens, a tool is used to clamp the polymer tooling (1) and pull it out from the square hole (3).

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