High-temperature-resistant spring end fixing plug

Abstract

The utility model discloses a high-temperature-resistant spring end fixing plug, which belongs to the technical field of springs and comprises a first plug tube, an annular protrusion fixed at the outer end of the first plug tube and a clamping groove formed in the end face of the annular protrusion, a wedge-shaped block is fixed on the inner end face of the clamping groove, the wedge-shaped block is matched with a notch in the end of a spring, and a spiral groove is formed in the inner side of the clamping groove. The end, away from the annular protrusion, of the first plug pipe is slidably provided with a plug sleeve, and the end, away from the annular protrusion, of the plug sleeve is fixedly provided with a second plug pipe. The wedge-shaped block is arranged at the inner end of the clamping groove, so that after the bottom end of the spring enters the clamping groove, the wedge-shaped block can be clamped at the notch in the end of the spring, the overall contact area of the fixing plug and the end of the spring is increased, the end of the spring is limited, the spring and the fixing plug are prevented from being rotationally fixed, and the service life of the spring is prolonged. In addition, through the arrangement of the spiral groove, the spring is installed in a spiral mode, and the anti-disengaging stability between the spring and the fixing plug is improved.

Description

Technical Field

[0001] This utility model relates to a fixing plug, and more particularly to a high-temperature resistant spring end fixing plug, belonging to the field of spring technology. Background Technology

[0002] The main function of the end retainer of the high-temperature resistant spring is to ensure the stability and functionality of the spring in a high-temperature environment through mechanical limiting and structural matching, such as the new type of high-temperature resistant spring proposed in publication number CN211624031U.

[0003] However, the retaining plug at the end of this type of spring has the following drawbacks when in use:

[0004] When the fixed plug is directly inserted into the end of the spring during installation, the spring is only limited by the slot. The spring and the fixed plug are prone to rotation, resulting in poor installation stability. At the same time, the length of the plug tube is fixed, and the insertion length of the plug tube cannot be adjusted according to the specifications of the spring, resulting in poor limiting stability.

[0005] To address this issue, a high-temperature resistant spring end retainer was designed. Utility Model Content

[0006] The main purpose of this invention is to provide a high-temperature resistant spring end fixing plug to solve the problems mentioned in the background art.

[0007] The objective of this utility model can be achieved by adopting the following technical solution:

[0008] A high-temperature resistant spring end fixing plug includes a first plug tube, an annular protrusion fixed to the outer end of the first plug tube, and a groove formed on the end face of the annular protrusion.

[0009] A wedge-shaped block is fixed to the inner end face of the slot, and the wedge-shaped block fits into the notch at the end of the spring. A spiral groove is opened on the inner side of the slot.

[0010] A sleeve is slidably disposed at the end of the first plug tube away from the annular protrusion, and a second plug tube is fixed at the end of the sleeve away from the annular protrusion. The outer diameter of the second plug tube is the same as that of the first plug tube, and a positioning mechanism is provided between the first plug tube and the sleeve.

[0011] Preferably, the first plug tube and the annular protrusion are integrally cast, and the insert and the second plug tube are integrally cast.

[0012] Preferably, the inner end of the first plug tube is provided with an annular groove, and the insert is slidably disposed inside the annular groove, the inner diameter of the insert being the same as the inner diameter of the first plug tube.

[0013] Preferably, the outer side of the second plug tube away from the first plug tube is provided with an arc-shaped guide edge, and the outer side of the arc-shaped guide edge is coated with a wear-resistant coating.

[0014] Preferably, the positioning mechanism includes threaded holes, screws, and I-grooves. The threaded holes are symmetrically opened on both sides of the first plug tube, and screws are threaded into the inside of the threaded holes. I-grooves are symmetrically opened on the side of the plug sleeve, and the end of the screw slides inside the I-grooves.

[0015] Preferably, both ends of the groove are provided with positioning holes, and the inner diameter of the positioning holes is the same as the outer diameter of the screw end.

[0016] Preferably, the outer end of the threaded hole is provided with a countersunk groove, and the thickness of the screw end is less than the depth of the countersunk groove.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. This utility model provides a wedge-shaped block at the inner end of the slot. After the bottom end of the spring enters the slot, the wedge-shaped block is locked at the notch at the end of the spring, thereby increasing the overall contact area between the fixing plug and the end of the spring and limiting the end of the spring to prevent the spring from rotating and being fixed with the fixing plug. In addition, the spiral groove is opened so that the spring is installed in a spiral manner, which improves the anti-disengagement stability between the spring and the fixing plug.

[0019] 2. This utility model has a sleeve that is slidably provided at the end of the first plug tube, and a second plug tube with the same outer diameter as the first plug tube is provided at the end of the sleeve. It is used in conjunction with a positioning mechanism composed of a threaded hole, a screw, a groove and a positioning hole. This allows the device to adjust the insertion depth of the plug tube according to the length of the spring during use, thereby improving the limiting stability of springs of different lengths and making it more practical. Attached Figure Description

[0020] Figure 1 This is an exploded structural diagram of the present invention;

[0021] Figure 2 This is a structural diagram of the combined state of this utility model;

[0022] Figure 3 This is a cross-sectional view of the first plug tube of this utility model;

[0023] Figure 4 This is a cross-sectional view of the second plug tube of this utility model.

[0024] In the diagram: 1. First plug tube; 101. Annular groove;

[0025] 2. Annular protrusion; 201. Spiral groove;

[0026] 3. Slot; 4. Wedge block; 5. Insert sleeve;

[0027] 6. Second plug tube; 601. Arc-shaped guide edge;

[0028] 7. Positioning mechanism; 701. Threaded hole; 702. Screw; 703. C-groove; 704. Positioning hole. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.

[0030] Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely to illustrate some embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0031] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] In the description of this utility model, it should be noted that the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] Example 1

[0035] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this embodiment proposes a high-temperature resistant spring end fixing plug, including a first plug tube 1, an annular protrusion 2 fixed to the outer end of the first plug tube 1, and a groove 3 opened on the end face of the annular protrusion 2.

[0036] A wedge block 4 is fixed to the inner end face of the slot 3, and the wedge block 4 fits into the notch at the end of the spring;

[0037] The cross-sectional shape of the wedge block 4 is a right trapezoid, with the angle between its inclined surface and the horizontal plane being 45°±10°. The height H satisfies H=(0.6-0.8)×spring wire diameter d, and the bottom width L satisfies L=(1.2-1.5)×d. The notch at the end of the spring is a trapezoidal groove that matches the wedge block 4. The groove depth is consistent with the height of the wedge block 4, and the bottom width of the groove is adapted to the bottom width of the wedge block 4 to ensure an interference fit or clearance fit. The wedge block 4 is connected to the inner end face of the slot 3 by embedded injection molding or screw fixing, and the fixing strength is sufficient to prevent it from falling off under the maximum working load of the spring.

[0038] A spiral groove 201 is provided on the inner side of the slot 3;

[0039] The spiral groove 201 is a right-hand single-start thread with a pitch P equal to the spring pitch. The groove depth h satisfies h = (0.3-0.5) × d, and the groove width w satisfies w = (1.1-1.3) × d. The starting end of the spiral groove 201 is provided with a 45° chamfer guide to facilitate the alignment and insertion of the spring end. The surface roughness Ra of the spiral groove 201 is ≤ 3.2 μm to reduce installation friction.

[0040] A sleeve 5 is slidably provided at the end of the first plug tube 1 away from the annular protrusion 2. A second plug tube 6 is fixed at the end of the sleeve 5 away from the annular protrusion 2. The outer diameter of the second plug tube 6 is the same as the outer diameter of the first plug tube 1. A positioning mechanism 7 is provided between the first plug tube 1 and the sleeve 5.

[0041] Regarding the material selection, the first plug tube 1, the annular protrusion 2, the insert 5, and the second plug tube 6 are made of high-temperature alloy or austenitic stainless steel with a temperature resistance of ≥600℃. When using the fixed plug, if the spring is long, in order to improve the limiting stability of the spring, the insert 5 can be controlled to slide outward inside the first plug tube 1, increasing the distance between the second plug tube 6 and the first plug tube 1. If the spring is short, the insert 5 can be completely inserted into the first plug tube 1, and the end faces of the first plug tube 1 and the second plug tube 6 are in contact. The positioning mechanism 7 is used to fix the position of the first plug tube 1 and the second plug tube 6. When the spring is installed, the first plug tube 1 and the second plug tube 6 are located inside the spring. Then the spring rotates through the spiral groove 201 into the slot 3. After the rotation is completed, the wedge block 4 is locked at the notch at the end of the spring to limit the spring and improve the stability of the spring end.

[0042] Example 2

[0043] The solution in Example 1 will be further described below with reference to its specific working method.

[0044] like Figure 2As shown, in a preferred embodiment, based on the above method, the first plug tube 1 and the annular protrusion 2 are integrally cast, and the sleeve 5 and the second plug tube 6 are integrally cast. The plug tubes have higher overall strength and longer service life during use.

[0045] like Figure 1 As shown, in a preferred embodiment, based on the above method, the inner end of the first plug tube 1 is provided with an annular groove 101, and the insert 5 is slidably disposed inside the annular groove 101. The inner diameter of the insert 5 is the same as the inner diameter of the first plug tube 1, and the outer diameter of the insert 5 and the inner diameter of the annular groove 101 are fitted with an H7 / g6 clearance, with a clearance value of 0.02-0.05mm, to ensure smooth sliding without obvious shaking. Since the inner diameter of the insert 5 is the same as the inner diameter of the first plug tube 1, the inside of the plug tube is kept smooth, avoiding wear on the limiting rod passing through the plug tube during use.

[0046] like Figure 1 As shown, in a preferred embodiment, based on the above method, the outer side of the second plug tube 6 away from the first plug tube 1 is provided with an arc-shaped guide edge 601. The radius of curvature of the arc-shaped guide edge 601 is R=2-5mm (adjusted according to the outer diameter of the plug tube, such as R=2mm when the outer diameter is 10mm), and the length of the guide edge is L=(0.5-1)×R. The outer side of the arc-shaped guide edge 601 is coated with a wear-resistant coating. During installation, the use of the arc-shaped guide edge 601 can facilitate the alignment of the spring insertion, making it more convenient to use. The wear-resistant coating is made of tungsten carbide (WC) spraying or molybdenum disulfide (MoS2) plating, with a temperature resistance ≥500℃.

[0047] like Figure 1 As shown, in a preferred embodiment, based on the above method, the positioning mechanism 7 further includes a threaded hole 701, a screw 702 and an incised groove 703. The threaded holes 701 are symmetrically opened on both sides of the first plug tube 1, and the screws 702 are threadedly installed inside the threaded holes 701. The incised grooves 703 are symmetrically opened on the side of the sleeve 5, and the ends of the screws 702 slide inside the incised grooves 703.

[0048] When adjusting the position of the second plug tube 6, first loosen the screw 702 so that the end of the screw 702 does not contact the inside of the groove 703, but the screw 702 is located inside the groove 703 to prevent the plug tubes from separating. Then rotate the second plug tube 6 to insert the end of the screw 702 into the vertical groove of the groove 703. Then slide the second plug tube 6 to pull it outward or squeeze it inward. After adjustment, rotate the second plug tube 6 again and then tighten the screw 702 to limit the position of the second plug tube 6.

[0049] like Figure 1As shown, in a preferred embodiment, based on the above method, both ends of the C-shaped groove 703 are provided with positioning holes 704. The inner diameter of the positioning hole 704 is the same as the outer diameter of the end of the screw 702. When the screw 702 is tightened and fixed, the end will be inserted into the interior of the positioning hole 704, thereby improving the positioning stability.

[0050] like Figure 1 As shown, in a preferred embodiment, based on the above method, the outer end of the threaded hole 701 is provided with a countersunk groove. The thickness of the end of the screw 702 is less than the depth of the countersunk groove. After the screw 702 is fully tightened, no protrusion will be formed on the outside of the first plug tube 1, ensuring the smoothness of the first plug tube 1 and making installation and insertion more convenient.

[0051] Example 3

[0052] The solutions in Embodiments 1 and 2 will be further described below with reference to their specific working methods.

[0053] When using the fixed plug, if the spring is long, to improve the limiting stability of the spring, first loosen the screw 702. The end of the screw 702 should not contact the inner side of the I-groove 703, but the screw 702 should be located inside the I-groove 703 to prevent separation between the plug tubes. Then rotate the second plug tube 6 to insert the end of the screw 702 into the vertical groove of the I-groove 703. Next, slide the second plug tube 6, pulling it outwards or pressing it inwards. After adjustment, rotate the second plug tube 6 again, and then tighten the screw 702 to secure the second plug tube. Position 6 is limited, and the end of screw 702 will be inserted into the positioning hole 704 to improve positioning stability. At the same time, after screw 702 is fully tightened, no protrusion will be formed on the outside of the first plug tube 1, ensuring the smoothness of the first plug tube 1 and making installation and insertion more convenient. When the spring is installed, the first plug tube 1 and the second plug tube 6 are located inside the spring. Then the spring is rotated into the slot 3 through the spiral groove 201. After the rotation is completed, the wedge block 4 is locked at the notch at the end of the spring to limit the spring and improve the stability of the spring end.

[0054] The above description is only a further embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed by the present utility model, based on the technical solution and concept of the present utility model, shall fall within the protection scope of the present utility model.

Claims

1. A high-temperature resistant spring end fixing plug, comprising a first plug tube (1), an annular protrusion (2) fixed to the outer end of the first plug tube (1), and a groove (3) formed on the end face of the annular protrusion (2). Its features are: A wedge block (4) is fixed on the inner end face of the slot (3). The wedge block (4) fits into the notch at the end of the spring. A spiral groove (201) is opened on the inner side of the slot (3). The first plug tube (1) has a sleeve (5) slidably disposed at the end away from the annular protrusion (2), and the sleeve (5) has a second plug tube (6) fixed at the end away from the annular protrusion (2). The outer diameter of the second plug tube (6) is the same as the outer diameter of the first plug tube (1), and a positioning mechanism (7) is provided between the first plug tube (1) and the sleeve (5).

2. The high-temperature resistant spring end fixing plug according to claim 1, characterized in that: The first plug tube (1) and the annular protrusion (2) are integrally cast, and the insert (5) and the second plug tube (6) are integrally cast.

3. The high-temperature resistant spring end fixing plug according to claim 1, characterized in that: The inner end of the first plug tube (1) is provided with an annular groove (101), and the insert (5) is slidably disposed inside the annular groove (101). The inner diameter of the insert (5) is the same as the inner diameter of the first plug tube (1).

4. The high-temperature resistant spring end fixing plug according to claim 1, characterized in that: The second plug tube (6) has an arc-shaped guide edge (601) on the outer side of the end away from the first plug tube (1), and the outer side of the arc-shaped guide edge (601) is coated with a wear-resistant coating.

5. The high-temperature resistant spring end fixing plug according to claim 1, characterized in that: The positioning mechanism (7) includes a threaded hole (701), a screw (702) and an incised groove (703). The threaded hole (701) is symmetrically opened on both sides of the first plug tube (1). The screw (702) is threaded inside the threaded hole (701). The incised groove (703) is symmetrically opened on the side of the sleeve (5). The end of the screw (702) slides inside the incised groove (703).

6. The high-temperature resistant spring end fixing plug according to claim 5, characterized in that: The two ends of the groove (703) are provided with positioning holes (704), and the inner diameter of the positioning holes (704) is the same as the outer diameter of the end of the screw (702).

7. A high-temperature resistant spring end fixing plug according to claim 5, characterized in that: The outer end of the threaded hole (701) is provided with a countersunk groove, and the thickness of the end of the screw (702) is less than the depth of the countersunk groove.

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