Assembly jig for electric valve stopper and assembly method for electric valve stopper

Abstract

The application provides an assembling jig of an electric valve stop device and an assembling method of the electric valve stop device. The electric valve stop device comprises a sliding ring and a spring guide rail. The assembling jig comprises a limiting seat and a positioning column arranged on the limiting seat. The positioning column comprises a main body section and a guide section. The lower end of the main body section is connected to the limiting seat, and the upper end is connected to the guide section. The main body section is in a cylindrical structure. The sidewall of the guide section is a guide inclined surface in a circumferential direction. The sidewall of the limiting seat is provided with a first limiting surface. The first limiting surface is used to contact a circumferential limiting section of the spring guide rail in a circumferential direction. The assembling jig and the assembling method can improve production efficiency and reduce labor cost.

Description

Technical Field

[0001] This invention relates to the field of valve assembly technology, specifically to an assembly fixture for an electric valve stop device and an assembly method for the electric valve stop device. Background Technology

[0002] An electric valve includes a nut, a rotor assembly, a valve stem, and a valve core connected to the valve stem. The rotor of the rotor assembly rotates to drive the valve stem to rotate. The valve stem and nut are screwed together, allowing the valve stem to rotate while simultaneously moving axially, thereby moving the valve core away from or towards the valve port. To control the movement of the valve stem, the electric valve also includes a stop device, which includes a spring guide rail and a slip ring. The spring guide rail includes a helical guide portion and vertically extending upper and lower stop sections. The spring guide rail is mounted on the nut. The rotor assembly includes a rotor stop rod, which drives the slip ring to rotate synchronously with the rotor. The slip ring rotates along the helical guide portion of the spring guide rail. When it rotates to the upper stop section, the slip ring is blocked and cannot continue rotating; when it rotates to the lower stop section, the slip ring is blocked and cannot continue rotating, thus limiting the rotation of the rotor and correspondingly limiting the movement of the valve stem.

[0003] When assembling the spring guide rail and slip ring of the stop device, first, place the spring guide rail onto the outside of the nut, and then install the slip ring onto the spring guide rail. Initially, the slip ring needs a certain installation angle, meaning the central axis of the slip ring and the central axis of the spring guide rail should be at an angle. This allows for preliminary assembly of the slip ring onto the spring guide rail. Then, rotate the slip ring to complete the assembly. During rotation, a preset angle needs to be maintained between the upper stop section of the spring guide rail and the tail of the slip ring. If the angle is too large, the rotation of the slip ring will be interfered with by the upper stop section, affecting the final assembly of the slip ring and spring guide rail. Therefore, the installation angle and the preset angle must be maintained when assembling the slip ring with the spring guide rail.

[0004] It is evident that the assembly of slip rings and spring guides is constrained by the aforementioned angles. Currently, assembly relies on manual labor, and ensuring the aforementioned installation tilt angle and preset included angle results in low production efficiency and high human resource costs. Summary of the Invention

[0005] The purpose of this application is to provide an assembly fixture for an electric valve stop device and an assembly method for the electric valve stop device, which can improve production efficiency and reduce labor costs.

[0006] This application provides an assembly fixture for an electric valve stop device. The electric valve stop device includes a slip ring and a spring guide rail. The assembly fixture includes a limiting seat and a positioning post disposed on the limiting seat. The positioning post includes a main body section and a guide section connected together. The lower end of the main body section is connected to the limiting seat, and the upper end is connected to the guide section. The main body section has a cylindrical structure, and a section of the side wall of the guide section in the circumferential direction is a guide slope. The side wall of the limiting seat has a first limiting surface, which is used to contact the circumferential limiting section of the spring guide rail in the circumferential direction.

[0007] The assembly fixture in this application, due to its guide ramp, allows the slip ring to automatically maintain the required installation angle with the central axis of the spring guide rail during the initial stage of assembly. This ensures smooth placement onto the spring guide rail without requiring manual control of the installation angle, enabling machine assembly. Furthermore, the assembly fixture includes a limiting seat with a first limiting surface. The circumferential limiting section of the spring guide rail can contact and limit the spring guide rail circumferentially, thus defining its orientation. By controlling the slip ring to be conveyed to the spring guide rail in a fixed orientation, the relative position of the slip ring and the spring guide rail in the circumferential direction can be determined, thus establishing the required preset angle between the upper stop section of the spring guide rail and the tail of the slip ring. Therefore, this assembly fixture facilitates the automation of stop device assembly, thereby improving production efficiency, saving manpower, and reducing costs. Attached Figure Description

[0008] Figure 1 This is an exploded view of the spring guide rail and slip ring in the electric valve stop device in the embodiments of this application;

[0009] Figure 2 for Figure 1 Schematic diagram of the structure of the middle spring guide rail;

[0010] Figure 3 for Figure 1 Schematic diagram of the middle slip ring;

[0011] Figure 4 for Figure 1 A schematic diagram of the assembled spring guide rail and slip ring;

[0012] Figure 5 for Figure 4 Top view;

[0013] Figure 6 This is a schematic diagram of the assembly fixture for the electric valve stop device in the embodiments of this application;

[0014] Figure 7 for Figure 6 Front view of the assembly fixture;

[0015] Figure 8 For spring guides and slip rings in Figure 6 A schematic diagram showing the assembly fixture in its completed assembly state;

[0016] Figure 9 for Figure 8 The main view;

[0017] Figure 10 for Figure 9 The left view;

[0018] Figure 11 This is a flowchart of the assembly method of the electric valve stop device in the embodiments of this application.

[0019] The reference numerals in the above figures are explained as follows:

[0020] 32-Nut; 32a-Upper part of nut; 32b-Middle part of nut; 32c-Lower part of nut; 32d-Protrusion; 32e-Third groove;

[0021] 33-Spring guide rail; 33a-Upper stop straight section; 33b-First spiral guide section; 33c-Lower stop straight section; 33d-Circumferential limiting section; 33e-Axial limiting section;

[0022] 34-Slip ring; 34a-Actuating part; 34b-Second spiral guide part; 34c-Slip ring tail;

[0023] 100-Assembly fixture;

[0024] 101-Positioning post; 1011-Main body section; 1012-Guide section; 10121-Conical section; 102-Limiting seat; 1021-First limiting surface; 1022-Second limiting surface; 102a-Notch; 103-Base. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] The assembly fixture 100 provided in this embodiment is a spring guide rail 33 and a slip ring 34 for installing the electric valve stop device. To facilitate understanding of the assembly fixture 100, the specific structure of the spring guide rail 33 and the slip ring 34 will be described first.

[0027] Please refer to Figure 1-5 , Figure 1 This is an exploded view of the spring guide rail 33 and slip ring 34 in the electric valve stop device in the embodiment of this application; Figure 2 for Figure 1 Schematic diagram of the structure of the middle spring guide rail 33; Figure 3 for Figure 1 Schematic diagram of the middle slip ring 34; Figure 4 for Figure 1 A schematic diagram of the assembled spring guide rail 33 and slip ring 34; Figure 5 for Figure 4 Top view.

[0028] The electric valve stop device includes a spring guide rail 33 and a slip ring 34, from Figure 1 As can be seen from the diagram, the spring guide rail 33 includes a first helical guide portion 33b, which is a multi-turn structure formed by a helix. The central axis X of the spring guide rail 33 is also the central axis of the helix. One end of the spring guide rail 33 extends in a direction parallel to the central axis X. The central axis X and the direction parallel to the central axis X are axial. This end is defined as the upper stop straight section 33a of the spring guide rail 33. The other end of the spring guide rail 33 opposite to the upper stop straight section 33a is a multi-segment structure, including a lower stop straight section 33c extending axially. The lower stop straight section 33c extends approximately radially and then axially. The axially extending section is defined as the circumferential limiting section 33d. The circumferential limiting section 33d extends downward and outward for a period and then extends circumferentially. The circumferentially extending section is defined as the axial limiting section 33e. The first helical guide section 1012 is located between the upper stop straight section 33a and the lower stop straight section 33c.

[0029] Looking at the slip ring 34, the slip ring 34 includes a second spiral guide portion 34b, which is also spirally formed. However, compared to the first spiral guide portion 33b, the second spiral guide portion 34b has fewer than two spiral turns, approximately one and a half turns. One end of the slip ring 34 is a deflecting portion 34a that connects to one end of the second spiral guide portion 34b. The deflecting portion 34a extends approximately radially, which is the radial direction of the second spiral guide portion 34b. The slip ring 34 also includes a slip ring tail portion 34c located at the other end of the second spiral guide portion 34b.

[0030] like Figure 4 As shown, the slip ring 34 needs to be fitted onto the spring guide rail 33. The electric valve includes a rotor assembly and a valve stem assembly. The rotor assembly is provided with a toggle rod extending along the axial direction of the electric valve. When the rotor of the rotor assembly rotates, the toggle rod actuates the toggle part 34a of the slip ring 34, thereby driving the slip ring 34 to rotate along the spring guide rail 33. Under the guidance of the first helical guide part 33b of the spring guide rail 33, the slip ring 34 will move up and down along the axial direction of the electric valve (which is also the axial direction of the spring guide rail 33). When it moves to the uppermost end, the slip ring 34 is blocked by the upper stop straight section 33a of the spring guide rail 33 and cannot continue to rotate. When it moves to the lowermost end, the slip ring 34 is blocked by the lower stop straight section 33c of the spring guide rail 33 and cannot continue to rotate, thereby limiting the rotation stroke of the rotor and correspondingly controlling the rotation stroke of the valve stem assembly that rotates synchronously with the rotor assembly on the electric valve.

[0031] Please continue reading below. Figure 6-9, Figure 6 This is a schematic diagram of the assembly fixture 100 for the electric valve stop device in this embodiment of the application; Figure 7 for Figure 6 Front view of the middle assembly fixture 100; Figure 8 For spring guide rail 33 and slip ring 34 in Figure 6 A schematic diagram showing the completed assembly state of assembly fixture 100; Figure 9 for Figure 8 The main view.

[0032] This embodiment provides an assembly fixture 100 for installing the aforementioned electric valve stop device, specifically for assembling the slip ring 34 and spring guide rail 33, and assembling them together. Figure 4 The assembly fixture 100 includes a limiting seat 102 and a positioning post 101 disposed on the limiting seat 102. The upper and lower positions in this application are defined according to the orientation of the assembly fixture in its use state, such as... Figure 7 As shown. The positioning post 101 is located above the limiting seat 102. The positioning post 101 is used for the sleeve of the spring guide rail 33, that is, the spring guide rail 33 can be sleeved on the outside of the positioning post 101. The positioning post 101 plays a positioning role for the spring guide rail 33, so that the spring guide rail 33 is positioned in a basically vertical state, so that the slip ring 34 can be assembled onto the spring guide rail 33 later.

[0033] Specifically, the positioning post 101 includes a main body section 1011 and a guide section 1012 connected together. The lower end of the main body section 1011 is connected to the limiting seat 102, and the upper end is connected to the guide section 1012. In this embodiment, the main body section 1011 and the guide section 1012 are an integral structure, but they can also be set separately. The main body section 1011 is a cylindrical structure with a diameter D2. The diameter D2 can be slightly smaller than the inner diameter of the spring guide rail 33 to meet the requirements of the spring guide rail 33 being able to be fitted and the radial positioning after fitting. The central axis X of the spring guide rail 33 is also the central axis X of the main body section 1011, that is, the two are coaxially assembled. The axial height of the main body section 1011 is L2, which is smaller than the height of the first helical guide part 33b. This ensures that after the spring guide rail 33 is assembled to the mounting positioning post 101, part of the first helical guide part 33b of the spring guide rail 33 can be located outside the guide section 1012, so as to complete the initial assembly with the slip ring 34 later. In addition, the side wall of the limiting seat 102 is provided with a first limiting surface 1021, which is used to contact the circumferential limiting section 33d of the spring guide rail 33 in the circumferential direction. That is, after the second helical guide portion 34b of the spring guide rail 33 is sleeved onto the positioning post 101, the circumferential limiting section 33d extending axially below it can contact the first limiting surface 1021 of the limiting seat 102 in the circumferential direction. Once the spring guide rail 33 is assembled onto the assembly fixture 100, the position of the spring guide rail 33 in the circumferential direction is determined, and the radial and circumferential directions of the spring guide rail 33 are both positioned.

[0034] The side wall of the guide section 1012 of the positioning post 101 has a guide slope in the circumferential direction. The diameters of the second helical guide portion 34b of the slip ring 34 and the first helical guide portion 33b of the spring guide rail 33 are approximately equal. When the slip ring 34 is assembled to the spring guide rail 33, it cannot be directly fitted along the axial direction. The slip ring 34 needs to be inserted into the spring guide rail 33 at a certain installation angle. Here, the inclination angle of the guide slope of the assembly fixture 100 is equal to the aforementioned installation angle. During assembly, after the slip ring 34 is fitted onto the guide section 1012, due to the presence of the guide slope, the slip ring 34 will automatically have an installation angle relative to the central axis X of the spring guide rail 33, thereby creating a certain assembly gap between the slip ring 34 and the spring guide rail 33 in the radial direction. This allows the upper stop straight section 33a of the spring guide rail 33 to be located inside the second helical guide portion 34b of the slip ring 34, and the spring guide rail 33 and the slip ring 34 can also be smoothly assembled together. Figure 9 As shown, the upper stop straight section 33a is located on the inner side of the uppermost ring of the spring guide rail 33 and extends upward so that the subsequent slip ring 34 can rotate along the spring guide rail 33.

[0035] Therefore, it can be seen that the assembly fixture 100 in this embodiment is provided with a guide slope, which makes it possible for the slip ring 34 to automatically maintain the required installation angle with the central axis X of the spring guide rail 33 in the initial stage of assembly, so that it can be smoothly fitted onto the spring guide rail 33 without relying on manual control of the installation angle. The assembly can be performed by machine, which is conducive to the automation of assembly, saving manpower and reducing costs.

[0036] In addition, the assembly fixture 100 in this embodiment also includes a limiting seat 102 with a first limiting surface 1021. The circumferential limiting segment 33d of the spring guide rail 33 can contact and limit the first limiting surface 1021 in the circumferential direction, thereby limiting the orientation of the spring guide rail 33 in the circumferential direction. As long as the slip ring 34 is controlled to be transmitted to the position of the spring guide rail 33 in a fixed orientation, the relative position of the slip ring 34 and the spring guide rail 33 in the circumferential direction can be determined. It can also be determined that there is a required preset included angle θ between the upper stop straight segment 33a of the spring guide rail 33 and the tail of the slip ring 34c.

[0037] In detail, once the position of the first limiting surface 1021 is determined, the circumferential position of the upper stop straight section 33a of the installed spring guide rail 33 relative to the assembly fixture 100 is also determined. At this time, the circumferential position of the slip ring tail 34c of the slip ring 34, which needs to maintain a preset angle θ with the upper stop straight section 33a, relative to the assembly fixture 100 is also determined. The conveying device or conveying angle of the conveying machine for the slip ring 34 can be designed according to the required circumferential position of the slip ring tail 34c, so that the slip ring 34 can be directly assembled with the slip ring tail 34c and the upper stop straight section 33a in a preset angle θ state.

[0038] Specifically, the sidewall of the guide section 1012 includes a conical section 10121 and an arcuate section connected circumferentially. The conical section 10121 is a guide slope, the diameter of the arcuate section is equal to the diameter D2 of the main body section 1011, and the radial dimension of the uppermost end of the guide section 1012 is D3. For example... Figure 7 As shown, the sidewalls of the arc-shaped section and the lower main body section 1011 are flush. The positioning post 101 can be an integral structure, or a conical section 10121 can be machined on the top of the cylindrical blank to form the positioning post 101, which is simple to machine. Using the conical section 10121 as a guide slope, the guide slope has more contact surface with the slip ring 34, which facilitates a smoother insertion of the slip ring 34. Of course, the guide slope is not limited to the conical section 10121; for example, a straight slope can also be used.

[0039] In detail, the first limiting surface 1021 and the conical segment 10121 are radially distributed on both sides of the central axis X of the positioning post 101, as shown below. Figure 7 As shown above, when the slip ring 34 is assembled to the spring guide rail 33, it needs to have a certain installation tilt angle relative to the central axis X of the spring guide rail 33, that is, a certain eccentric angle, so as to fit onto the spring guide rail 33 and allow the upper stop straight section 33a of the spring guide rail 33 to be located inside the slip ring 34. Therefore, the slip ring 34 is preferably tilted relative to the position of the upper stop straight section 33a. The upper stop straight section 33a and the circumferential limiting section 33d of the spring guide rail 33 are roughly flush in the axial direction. After assembly, the first limiting surface 1021 and the upper stop straight section 33a are also roughly flush in the axial direction. Then, the conical section 10121 and the first limiting surface 1021 on the assembly fixture 100 can be radially separated, so that after the slip ring 34 is installed on the guide section 1012, it tilts towards the upper stop straight section 33a of the spring guide rail 33, and the tilt angle is the required installation tilt angle.

[0040] In this embodiment, the limiting seat 102 is a cylindrical structure. Cylindrical structures are easy to manufacture. Therefore, the limiting seat 102 can also be square or other shapes; this is not a limitation. When the limiting seat 102 is cylindrical, its diameter is D1, which is larger than the diameter D2 of the positioning post 101. Thus, when the spring guide rail 33 is sleeved on the outside of the positioning post 101, it can be supported on the upper surface of the limiting seat 102. That is, the limiting seat 102 and the positioning post 101 form a step, and the upper surface of the limiting seat 102 is a stepped surface to support the spring guide rail 33.

[0041] like Figure 8As shown, the side wall of the limiting seat 102 has a notch 102a that extends through the axial direction of the limiting seat 102. The wall portion of the notch 102a includes a second limiting surface 1022 and a first limiting surface 1021. The first limiting surface 1021 extends vertically, and it can also extend radially along the limiting seat 102. One end of the second limiting surface 1022 is connected to one end of the first limiting surface 1021. The notch 102a is approximately V-shaped when the limiting seat 102 is projected axially. The method of machining the notch 102a to form the first limiting surface 1021 is relatively simple; for example, the notch 102a can be formed directly by stamping or cutting on the limiting seat 102. The limiting seat 102 is also provided with a second limiting surface 1022, which can be used to contact both the circumferential limiting section 33d and the lower stop straight section 33c of the spring guide rail 33, so as to better limit the spring guide rail 33. That is, the part of the spring guide rail 33 below the first helical guide portion 33b can be basically locked in the notch 102a, making the position of the spring guide rail 33 more stable after it is installed on the assembly fixture 100. It can be seen that the setting method of the first limiting surface 1021 is not limited to this. For example, the side wall of the limiting seat 102 has a protrusion, and the protruding part of the side wall can also serve as the first limiting surface 1021. The height of the limiting seat 102 is L1, and this height L1 needs to be no less than the height below the lower stop straight section 33c of the spring guide rail 33.

[0042] In addition, such as Figure 7 , 8 As shown, the second limiting surface 1022 at the notch 102a gradually slopes upwards towards the limiting seat 102, in conjunction with... Figure 2 It is understood that the multi-segment structure at the lower end of the spring guide rail 33 has a certain angle of inclination relative to the central axis X of the spring guide rail 33, and the second limiting surface 1022 can better match the circumferential limiting segment 33d and the axial limiting segment 33e.

[0043] In this embodiment, the position where the guide slope of the positioning post 101 connects with the main body section 1011, i.e., position A shown in Figure 7, has a height difference between this position and the highest position of the first helical guide portion 33b of the installed spring guide rail 33, which is approximately one pitch of the spring guide rail 33. A height difference that is too large or too small is unfavorable. If the height difference is less than one pitch, after the slip ring 34 is installed in the spring guide rail 33 and rotates one revolution, the slip ring 34 may no longer be on the conical section 1021. In this case, the upper stop straight section 33a will stop the continued rotation of the slip ring 34, affecting the overall installation of the slip ring 34. If the height difference is greater than one pitch, the slip ring 34 will remain on the conical section 10121 after rotation and installation, making it impossible to complete the overall installation of the slip ring 34.

[0044] Can continue to combine Figure 10 understand, Figure 10 for Figure 9 The left view.

[0045] For example, the total height of the limiting seat 102 and the positioning post 101 is Figure 7 As shown in L3, when the slip ring 34 is just installed on the spring guide rail 33 and has not yet rotated, the height of the highest position of the contact between the slip ring 34 and the conical section 10121 is L4. L3 is greater than L4, and the difference is not less than two pitches of the spring guide rail 33, so as to prevent the slip ring 34 from detaching from the spring guide rail 33 or falling off due to shaking, external force or other reasons.

[0046] In addition, such as Figure 10 As shown, when the slip ring 34 is initially installed into the spring guide rail 33 and has not yet rotated, the radial dimension of the guide section 102 at the contact position between the slip ring 34 and the conical section 10121 is D5. D5 needs to be less than the difference between the inner diameter D6 of the slip ring 34 and the wire diameter d1 of the spring guide rail 33, that is, to ensure that the assembly gap between the slip ring 34 and the guide section 102 is greater than the wire diameter d1, so that the upper stop straight section 33a can be inserted into the inner side of the first helical guide part 33b of the slip ring 34 to prevent the slip ring 34 from rotating during further assembly.

[0047] The assembly fixture 100 in this embodiment also includes a base 103, and a limiting seat 102 is disposed on the upper end surface of the base 103. The base 103 facilitates the arrangement of the device. The base 103 can be fixed to the workbench or serve as part of the workbench, ensuring the entire assembly fixture 100 is in a stable state. The base 103 can also be a cylindrical structure with a diameter D4, which is larger than the diameter D1 of the limiting seat 102, and can be significantly larger than D1, thus providing better stability.

[0048] Please refer to Figure 11 , Figure 11 This is a flowchart of the assembly method of the electric valve stop device in the embodiments of this application.

[0049] The assembly method of the electric valve stop device provided in this embodiment is carried out using the assembly fixture 100 of the electric valve stop device in the above embodiment, and includes the following steps:

[0050] Step S1: Sleeve the spring guide rail 33 onto the outside of the positioning post 101 and support it on the limiting seat 102, and make the circumferential limiting section 33d of the spring guide rail 33 and the first limiting surface 1021 of the limiting seat 102 contact each other circumferentially.

[0051] The step of fitting the spring guide rail 33 can be performed by machine. The machine carries the spring guide rail 33 from top to bottom and fits it onto the positioning post 101. When the spring guide rail 33 is carried onto the positioning post 101, the multi-segment structure located below the first spiral guide part 33b can be aligned with the notch 102a of the assembly fixture 100. After the machine fits it onto the positioning post 101 from top to bottom, the circumferential limiting segment 33d can automatically contact the first limiting surface 1021. Specifically, the axial limiting segment 33e and the circumferential limiting segment 33d are both inserted into the notch 102a.

[0052] Step S2: The slip ring 34, with its tail 34c and the upper stop section 33a of the spring guide rail 33 positioned at a predetermined angle θ in the circumferential direction, is fitted onto the guide section 102 of the assembly fixture 100. The slip ring 34 is then fitted onto the guide section 1012 of the positioning post 101, so that the slip ring 34, under the action of the guide slope of the guide section 1012, has the required installation angle relative to the central axis X of the spring guide rail 33, thus initially assembling the slip ring 34 onto the spring guide rail 33. At this time, the upper stop section 33a of the spring guide rail 33 is fitted into the slip ring 34.

[0053] Similarly, the slip ring 34 can be carried by a machine, which can transport the slip ring 34 to the position of the spring guide rail 33 for assembly according to a preset angle θ. Since the circumferential position of the spring guide rail 33 is determined by the first limiting surface 1021, it can be ensured that the slip ring 34 can be installed on the spring guide rail 33 according to the preset angle θ. It should be noted that in order for the slip ring 34 to automatically generate an installation tilt angle based on the action of the guide slope, the second spiral guide part 34b of the slip ring 34 needs to contact the guide slope during the falling process. Therefore, when the machine lowers the slip ring 34, it should place the slip ring 34 at a predetermined distance away from the central axis X of the spring guide rail 33. Before the slip ring 34 is fitted downward onto the spring guide rail 33, it will inevitably contact the guide slope of the guide section 1012, thereby automatically presenting a state with an installation tilt angle relative to the central axis X of the spring guide rail 33. The predetermined distance by which the slip ring 34 deviates from the central axis X of the spring guide rail 33 before falling is unlimited. It can be determined based on parameters such as the inclination angle of the tapered section 10121 of the guide section 1012 and the axial height of the guide section 102, so as to ensure that before the slip ring 34 falls to the spring guide rail 33 for initial assembly, the guide slope of the guide section 102 can cause the slip ring 34 to match the spring guide rail 33 with the required installation tilt angle.

[0054] After the slip ring 34 is matched with the spring guide rail 33 at the required installation angle, the upper stop straight section 33a of the spring guide rail 33 can be located inside the slip ring 34, completing the initial setup. Figure 8The state shown. It can be understood that the process of step S2 is as follows: the machine releases the slip ring 34 from above the spring guide rail 33 (the central axis of the slip ring 34 before being released is deviated from the central axis X of the spring guide rail 33 by a predetermined distance), then the slip ring 34 first contacts the guide section 1012 during its fall to generate an installation tilt angle, and then completes the initial assembly with the spring guide rail 33.

[0055] Step S3: Move the actuating part 34a of the slip ring 34 to transfer the slip ring 34 to the spring guide rail 33.

[0056] When the actuating part 34a of the slip ring 34 is rotated, it can be manually or mechanically rotated. The slip ring 34 can be rotated to the bottom of the spring guide rail 33 or to the middle of the spring guide rail 33, as long as the slip ring 34 and the spring guide rail 33 are in a relatively stable assembly position, which is beneficial for the subsequent loading and transportation of the electric valve. It can also be rotated to the required initial position according to the user's needs.

[0057] As a subsequent step, when assembling the electric valve, the assembled slip ring 34 and spring guide rail 33 can be removed from the assembly fixture 100 as components. This removal can be done by machine or manually. In this embodiment, the assembly fixture 100 can be used with a machine to automate the assembly of the electric valve stop device. Therefore, the removal step is done by machine, further ensuring the continuity of automated assembly. Specifically, the machine can grip the component and then insert it into the nut 32 of the electric valve. The nut 32 includes an upper part 32a, a middle part 32b, and a lower part 32c. The middle part 32b includes a protrusion 32d, which has an axially penetrating groove 32e. Figure 11 As shown, when the spring guide rail 33 and slip ring 34 are assembled together onto the nut 32 of the electric valve, the assembly is sleeved onto the upper part 32a of the nut, the circumferential limiting section 33d of the spring guide rail 33 is inserted into the groove 32e, and the axial limiting section 33e and the bottom of the middle part 32b of the nut are in axial limiting contact. The installation method of the electric valve stop device and the nut 32 is the prior art and will not be discussed further here.

[0058] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. An assembly fixture for an electric valve stop device, the electric valve stop device comprising a slip ring and a spring guide rail, characterized in that, The assembly fixture includes a limiting seat and a positioning post disposed on the limiting seat; the positioning post includes a main body section and a guide section connected together, the lower end of the main body section is connected to the limiting seat, and the upper end is connected to the guide section, the main body section is a cylindrical structure, and a section of the side wall of the guide section in the circumferential direction is a guide slope; the side wall of the limiting seat is provided with a first limiting surface, which is used to contact the circumferential limiting section of the spring guide rail in the circumferential direction.

2. The assembly fixture for the electric valve stop device according to claim 1, characterized in that, The sidewall of the guide section includes a conical section and an arc section connected circumferentially. The conical section is the guide slope, and the arc section has the same diameter as the main body section.

3. The assembly fixture for the electric valve stop device according to claim 2, characterized in that, The first limiting surface and the conical segment are radially distributed on both sides of the central axis of the positioning post.

4. The assembly fixture for the electric valve stop device according to claim 1, characterized in that, The limiting seat is a cylindrical structure. The side wall of the limiting seat has a notch that extends through the axial direction of the limiting seat. The wall of the notch includes a second limiting surface and a first limiting surface. One end of the second limiting surface is connected to one end of the first limiting surface. The second limiting surface is used to contact the circumferential limiting section and the axial limiting section of the spring guide rail.

5. The assembly fixture for the electric valve stop device according to any one of claims 1-4, characterized in that, The difference in height between the position where the guide ramp connects to the main body section and the highest position of the first helical guide portion of the installed spring guide rail is approximately one pitch of the spring guide rail.

6. The assembly fixture for the electric valve stop device according to any one of claims 1-4, characterized in that, The total height of the limiting seat and the positioning post is greater than the height of the highest position where the slip ring contacts the guide section when it is initially installed in the spring guide rail, and the difference is not less than two pitches of the spring guide rail.

7. The assembly fixture for the electric valve stop device according to any one of claims 1-4, characterized in that, When the slip ring is initially installed into the spring guide rail, the radial dimension of the guide segment corresponding to the contact position with the guide segment is the positioning dimension; the positioning dimension is less than the difference between the inner diameter of the slip ring and the wire diameter of the spring guide rail.

8. The assembly fixture for the electric valve stop device according to any one of claims 1-4, characterized in that, The assembly fixture also includes a base, and the limiting seat is disposed on the upper end surface of the base.

9. A method for assembling an electric valve stop device, characterized in that, The process of assembling the slip ring to the spring guide rail using the assembly fixture for the electric valve stop device according to any one of claims 1-8 includes the following steps: The spring guide rail is sleeved onto the outer periphery of the positioning post and supported by the limiting seat, and the circumferential limiting section of the spring guide rail and the first limiting surface of the limiting seat are in circumferential contact. The slip ring is fitted onto the guide section of the assembly fixture with a predetermined angle between its tail and the upper stop section of the spring guide rail in the circumferential direction. The slip ring has an installation tilt angle under the action of the guide section to be initially assembled onto the spring guide rail. The upper stop section of the spring guide rail is fitted into the slip ring. The slip ring is rotated along the spring guide rail by actuating the actuating part of the slip ring, thereby transferring the slip ring to the spring guide rail.

10. The assembly method of the electric valve stop device according to claim 9, characterized in that, Position the slip ring above the spring guide rail, with a predetermined distance between the central axis of the slip ring and the central axis of the spring guide rail. Then, loosen the slip ring so that it fits onto the guide section.

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