Positioning jig convenient for mounting flange sealing gasket

Abstract

The utility model relates to a positioning jig convenient to install a flange sealing gasket, which comprises a support and three limiting rods arranged on the support, the support comprises a first vertical rod, a second vertical rod and a cross rod which are abutted against a flange, the cross rod comprises a first cross rod and a second cross rod which are connected in an inserted manner, and the first vertical rod and the second vertical rod are inserted into positioning holes of the first cross rod and the second cross rod. The upper end of the first vertical rod and the upper end of the second vertical rod are provided with first limiting parts abutting against the peripheral face of the flange, a tension spring is arranged between the lower ends of the first vertical rod and the second vertical rod, and meanwhile the portions, below the transverse rod, of the first vertical rod and the second vertical rod are sleeved with springs; and a restraining piece capable of enabling the first limiting rod to be always located at the center line position of the transverse rod is further arranged. By means of the spring and the first limiting parts on the first vertical rod and the second vertical rod, the support can be clamped on the flange to achieve easy operation, and the sealing gasket can be rapidly positioned under the cooperation of the first limiting rod and the second limiting rod.

Description

Technical Field

[0001] This utility model relates to the technical field of workpiece positioning fixtures, specifically to a positioning fixture that facilitates the installation of flange sealing gaskets. Background Technology

[0002] Flange gaskets (also known as sealing gaskets) are typically placed between the end faces of two flanges on a pipeline. Their main function is to fill the gap between the two components connected by the flanges, thereby ensuring a seal between the end faces of the two flanges. In actual installation, especially during maintenance, it is difficult to align the center hole of the gasket with the center axis of the flange. This is mainly because: the flange end face is relatively smooth, making the gasket prone to falling off, requiring the use of auxiliary fixtures to pre-position the gasket; and because the diameter of the gasket is smaller than the diameter of the flange face, if the gasket is misaligned, it will affect the seal between the two flanges, potentially leading to fluid leakage in the pipeline.

[0003] Therefore, existing technologies include positioning fixtures for installing flange gaskets. For example, Chinese Patent Publication No. CN207807490U45 discloses such a positioning fixture. This fixture includes a support with three circumferentially spaced claws. Each claw has a measuring structure for measuring the distance between the outer circumferential surface of the flange gasket and the outer circumferential surface of the mating flange. The measuring structure has scale values ​​on the claw's shaft. By reading the specific values ​​on the measuring structure, the difference between the specific position of the flange gasket and the center position of the flange is obtained. The position of the flange gasket is then adjusted by adjusting the support. However, the entire fixture requires manual support, and the flange on site may be in a high position. Furthermore, because the claws consist of multiple connecting rods, multiple adjustments are needed to center the flange gasket, making the operation time-consuming and labor-intensive. Therefore, further improvements to the structure of the flange gasket positioning fixture are needed. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a positioning fixture that facilitates the installation of flange gaskets, making the positioning of the gaskets easy and convenient, in light of the existing technology.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problem is as follows: This positioning fixture for facilitating the installation of flange gaskets includes a bracket and three limiting rods mounted on the bracket and capable of abutting against the outer circumferential surface of the gasket. The bracket includes a horizontal rod, a first vertical rod, and a second vertical rod that can respectively abut against the outer circumferential surface of the flange. The horizontal rod is composed of two adjacent horizontal rods, the first and second horizontal rods, which are interlocked. The first and second vertical rods are slidably inserted into positioning holes at the far ends of the first and second horizontal rods, respectively, and their upper ends are respectively connected... The first limiting part extends out and abuts against the upper outer circumference of the flange. The lower ends of the first vertical rod and the second vertical rod are connected by a tension spring that makes the first vertical rod and the first horizontal rod, and the second vertical rod and the second horizontal rod always tend to move closer to each other. The first vertical rod and the second vertical rod are each fitted with a spring located below the horizontal rod and making the corresponding vertical rod always tend to move downward. The three limiting rods are composed of a first limiting rod located on the center line of the horizontal rod and two second limiting rods symmetrically distributed with the first limiting rod as the center. At the same time, a constraint member is also provided to keep the first limiting rod always at the center line position of the horizontal rod.

[0006] To ensure the first limiting rod remains centered, preferably, both the first and second crossbars have laterally extending and vertically penetrating channels. The lower end of the first limiting rod passes through these channels and connects to the constraint member. During installation, the first and second crossbars may shift in opposite directions, causing a change in their center position. By providing channels on the first and second crossbars, this application ensures the first limiting rod remains centered after the crossbars are combined, facilitating the installation of the sealing gasket at the center of the flange. Simultaneously, these channels provide installation space for the first limiting rod, preventing interference between it and the crossbars.

[0007] For ease of adjustment, preferably, each of the second limiting rods is also inserted vertically and slidably constrained within the channel. The channel provides installation space for the two second limiting rods, which can extend upwards from the channel to both sides of the outer circumference of the sealing gasket. Since different sealing gaskets have different diameters during installation, the sliding connection of the second limiting rods within the channel can accommodate the installation requirements of sealing gaskets of different diameters.

[0008] To ensure equidistant adjustment of the second limiting rod, preferably, the constraint component includes a positioning sleeve positioned at the lower end of the first limiting rod and a first and second inclined rod symmetrically distributed around the first limiting rod. The bottom end of the first inclined rod is hinged to one side of the positioning sleeve, and the top end of the first inclined rod is hinged to a first horizontal bar. The bottom end of the second inclined rod is hinged to the other side of the positioning sleeve, and the top end of the second inclined rod is hinged to a second horizontal bar. The first and second inclined rods are hinged to their corresponding second limiting rods via fasteners. By symmetrically arranging the first and second inclined rods on both sides of the first limiting rod, and with each inclined rod hinged to its corresponding horizontal bar and second limiting rod, when the first and second horizontal bars move away from each other under external force or move closer together under tension spring action, both second limiting rods can be equidistantly adjusted with the first limiting rod as the centerline, thus facilitating the centering of the sealing gasket on the flange.

[0009] For ease of adjustment, preferably, the lower end of the first limiting rod is designed as a screw, with a threaded sleeve threaded onto the screw. The positioning sleeve is constrained vertically by the threaded sleeve but can rotate relative to it in the circumferential direction. By designing the lower end of the first limiting rod as a screw and using a threaded sleeve to engage with it, the height of the first limiting rod can be adjusted; furthermore, the screw and threaded sleeve are easy to install and remove, and the operation is simple.

[0010] To limit the second limiting rod, preferably, sliders are slidably connected to the first and second crossbars respectively, and each second limiting rod can be slidably inserted into the corresponding slider's insertion hole. Since the width of the second limiting rod is smaller than the channels on the first and second crossbars, the second limiting rod may wobble during movement and after it has been positioned, thus affecting its positioning. By equipping the first and second crossbars with sliders for inserting the second limiting rods, the second limiting rods can be limited while also facilitating operator operation.

[0011] To facilitate the positioning of the gasket, one end of each of the second limiting rods can be inserted and positioned on the corresponding vertical rod, while the other ends are distributed opposite each other and face the outer circumference of the gasket. Once the installation dimensions of the two second limiting rods (i.e., the distance between their contact points with the gasket and the contact points between the two vertical rods and the outer circumference of the flange equals the difference between the flange radius and the gasket radius) are determined, they are fixed relative to the vertical rods using bolts and nuts. At this time, the other ends of the two second limiting rods and the top of the first limiting rod (where the top of the first limiting rod is the contact point with the outer circumference of the flange, and the distance between this contact point and the top of the horizontal rod is also equal to the difference between the flange radius and the gasket radius) together form a limiting space, within which the gasket can be installed.

[0012] For ease of fixation, preferably, the first limiting part is tangent to the outer peripheral surface of the flange to form a line contact. The first limiting part is located at the top of the second limiting rod and extends laterally along the thickness direction of the flange. In this case, the surface of the first limiting part facing the outer peripheral surface of the flange needs to be designed as an arc surface, which facilitates matching flanges of different specifications.

[0013] Furthermore, the bottom of the first and second vertical rods is partially expanded to form a second limiting part. The lower end of each spring abuts against the corresponding second limiting part, while its top end abuts against the bottom of the horizontal rod. Each spring is respectively sleeved on the first and second vertical rods, with the top of the spring abutting against the corresponding horizontal rod and the bottom of the spring abutting against the second limiting part on the corresponding vertical rod. During the process of the operator lifting and fixing the positioning fixture to the outer circumference of the flange, the spring provides a downward restoring force, ensuring that the first limiting part remains firmly held against the outer circumference of the flange.

[0014] To guide the sealing gasket, preferably, the end of the second limiting rod is provided with a guide ramp for inserting the sealing gasket. When the operator fixes the bracket to the flange, the sealing gasket needs to be placed in the limiting space between the first limiting rod and the two limiting rods. Under the guidance of the guide ramp, the sealing gasket can quickly enter the limiting space to complete the installation.

[0015] Compared with existing technologies, the bracket of this invention is designed to abut against the first and second vertical rods and the horizontal rod on the outer circumferential surface of the flange. Therefore, during installation, the three limiting rods can be pre-positioned on the bracket according to the radius of the gasket and the flange radius. Then, overcoming the force of the tension spring, the first and second horizontal rods are moved away from each other. Subsequently, the first and second vertical rods are moved away from each other, and their upper ends move upward along both sides of the flange. After the external force is removed, under the action of the restoring force of the tension spring, the first and second vertical rods are brought closer together under the guidance of the first and second horizontal rods and abut against the outer circumferential surfaces of both sides of the flange. At this time, with the help of the spring and the first limiting part on the first and second vertical rods, the bracket can hold onto the flange without further support. Then, the gasket can be placed between the two second limiting rods from top to bottom until the lower outer circumferential surface of the gasket abuts against the top of the first limiting rod. Obviously, using the fixture of this invention, the positioning of the gasket is convenient, quick, easy, and safe. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model;

[0017] Figure 2 for Figure 1 The front view;

[0018] Figure 3 for Figure 1 Rear view;

[0019] Figure 4 This is a cross-sectional view of an embodiment of the present utility model;

[0020] Figure 5 This is a longitudinal sectional view of an embodiment of the present utility model.

[0021] In the diagram: 1. Bracket; 11. Crossbar; 111. First crossbar; 112. Second crossbar; 113. Positioning hole; 114. Channel; 115. First limiting part; 116. Second limiting part; 12. First vertical bar; 13. Second vertical bar; 2. Limiting rod; 21. First limiting rod; 211. Screw; 22. Second limiting rod; 221. Guide slope; 3. Tension spring; 4. Spring; 5. Constraint; 51. Positioning sleeve; 52. First inclined rod; 53. Second inclined rod; 6. Screw sleeve; 7. Slider; 71. Insertion hole; 8. Fastener; A. Flange; B. Sealing gasket. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] like Figures 1 to 5 The diagram shows the preferred embodiment of this utility model. This positioning fixture for facilitating flange gasket installation includes a bracket 1 and three limiting rods 2 mounted on the bracket 1 and capable of abutting against the outer circumferential surface of the gasket B. The bracket 1 includes a horizontal rod 11, a first vertical rod 12, and a second vertical rod 13 that can abut against the outer circumferential surface of the flange A. The horizontal rod 11 is composed of two adjacent horizontal rods 111 and 112 that are interlocked. Positioning holes 113 are formed at the far ends of both the first horizontal rod 111 and the second horizontal rod 112. The first vertical rod 12 and the second vertical rod 13 are slidably inserted into the positioning holes 113. After being inserted into the positioning holes 113, their upper ends extend outwards to abut against the upper outer surface of the flange A. The first limiting part 115 on the circumference is connected to the lower ends of the first vertical rod 12 and the second vertical rod 13 by a tension spring 3. The tension spring 3 can make the first vertical rod 12 and the first horizontal rod 111, the second vertical rod 13 and the second horizontal rod 112 always tend to move closer to each other. The first vertical rod 12 and the second vertical rod 13 are each fitted with a spring 4 located below the horizontal rod 11. The spring 4 acts on the corresponding vertical rod, so that the corresponding vertical rod always tends to move downward. The three limiting rods 2 are composed of a first limiting rod 21 located on the center line of the horizontal rod 11 and two second limiting rods 22 symmetrically distributed with the first limiting rod 21 as the center. At the same time, a constraint member 5 is also provided to keep the first limiting rod 21 always at the center line position of the horizontal rod 11.

[0024] During installation, the first crossbar 111 and the second crossbar 112 will translate in opposite directions, causing a change in the center position of the combined first crossbar 111 and second crossbar 112. To ensure that the first limiting rod 21 always remains at the center position of the crossbar 11, refer to... Figure 1 and Figure 4 In this embodiment, a transversely extending and vertically penetrating channel 114 is provided on the first crossbar 111 and the second crossbar 112. The lower end of the first limiting rod 21 passes through the channel 114 and can be connected to the constraint member 5. With the help of the constraint member 5, the first limiting rod 21 is always kept in the center position after the first crossbar 111 and the second crossbar 112 are combined, which facilitates the installation of the sealing gasket B in the center position of the flange A. Obviously, the channel 114 also provides installation space for the first limiting rod 21 and can avoid interference between the first limiting rod 21 and the crossbar 11.

[0025] Furthermore, the channel 114 provides installation space for two second limiting rods 22. The two second limiting rods 22 are vertically inserted and slidably constrained within the channel 114. By sliding the second limiting rods 22 within the channel 114, the installation requirements of sealing gaskets B of different sizes can be met. Moreover, during and after movement, to prevent the second limiting rods 22 from swaying left and right within the channel 114 and affecting their positioning, refer to... Figure 3 and Figure 4 In this embodiment, two second limiting rods 22 are slidably inserted into the insertion holes 71 of the corresponding sliders 7, and each slider 7 is then sleeved on the corresponding part of the crossbar 11. The sliders 7 can limit the second limiting rods 22 and facilitate the operation of the operator.

[0026] refer to Figures 1 to 3 The constraint member 5 preferably adopts the following structure: it includes a positioning sleeve 51 positioned at the lower end of the first limiting rod 21, and a first inclined rod 52 and a second inclined rod 53 symmetrically distributed around the first limiting rod 21. The first inclined rod 52 and the second inclined rod 53 are symmetrically arranged on both sides of the first limiting rod 21, and each inclined rod is hinged to both the corresponding horizontal rod 11 and the corresponding second limiting rod 22 through fasteners 8. In this embodiment, the fasteners 8 are preferably screws and nuts that cooperate with each other. At this time, when the first horizontal rod 111 and the second horizontal rod 112 move away from each other under the action of external force or move closer to each other under the action of tension spring 3, the two second limiting rods 22 can be adjusted equidistantly with the first limiting rod 21 as the center line, thereby facilitating the centering of the sealing gasket B on the flange A. After adjustment, the second limiting rods 22 are positioned by the fasteners 8.

[0027] refer to Figure 5In this embodiment, the lower end of the first limiting rod 21 is designed as a screw 211 and is fitted with a threaded sleeve 6. The positioning sleeve 51 is constrained vertically (specifically by radial screws or spring pins, etc.) on the threaded sleeve 6 and can rotate relative to it in the circumferential direction. That is, at this time, the positioning sleeve 51 is limited on the first limiting rod 21 by the threaded sleeve 6, and the threaded sleeve 6 also rotates with the help of the positioning sleeve 51. The advantages are: on the one hand, the height of the first limiting rod 21 can be adjusted by rotating the threaded sleeve 6; on the other hand, the installation and disassembly of the screw 211 and the threaded sleeve 6 are convenient and simple to operate. During the installation process, in order to facilitate the insertion of the sealing gasket B, the end of the second limiting rod 22 is provided with a guide slope 221 for the insertion of the sealing gasket B. Under the guidance of the guide slope 221, the sealing gasket B can quickly enter the limiting space between the first limiting rod 21 and the two second limiting rods 22, thereby quickly completing the installation.

[0028] In this embodiment, to accommodate flanges of different specifications, the first limiting part 115 extends laterally along the thickness direction of flange A, and its surface facing the outer circumference of flange A is designed as an arc surface (see reference). Figure 5 Of course, for flange A of a specific specification, the first limiting part 115 can also be designed as an arc-shaped strip that can closely fit the upper outer circumferential surface of flange A to increase the contact area and thus improve the stability after clamping. At the same time, this embodiment is provided with a key component, spring 4, on the first vertical rod 12 and the second vertical rod 13. The spring 4 is respectively sleeved on the first vertical rod 12 and the second vertical rod 13. The top of the spring 4 abuts against the corresponding horizontal rod 11, and the bottom of the spring 4 abuts against the second limiting part 116 on the corresponding vertical rod. When the operator lifts and fixes the positioning fixture on the outer circumferential surface of flange A, the spring 4 can provide a downward restoring force, so that the first limiting part 115 can always clamp tightly on the outer circumferential surface of flange A.

[0029] The working principle of the positioning fixture in this embodiment is as follows: Before installation, the operator calculates the installation dimensions of the first limiting rod 21 and the two second limiting rods 22 according to the radius of the sealing gasket B and the radius of the flange A. At this time, loosen the threaded sleeve 6 and the fastener 8, and adjust the first limiting rod 21 and the two second limiting rods 22 to the designated positions. After adjustment, tighten the threaded sleeve 6 and the fastener 8. The operator lifts the bracket 1 upwards and pulls the first vertical rod 12 and the second vertical rod 13 outwards, causing the upper ends of the first vertical rod 12 and the second vertical rod 13 to move upwards along both sides of the flange A. Then, the external force is removed. Under the action of the restoring force of the tension spring 3, the first and second vertical rods 13 approach each other under the guidance of the first horizontal rod 111 and the second horizontal rod 112, and abut against the outer circumferential surfaces on both sides of the flange A. At the same time, with the help of the downward force of the spring 4, the first limiting part 115 on the first and second vertical rods 13 hugs the flange A without the need for manual support. At this time, the sealing gasket B can be placed between the two second limiting rods 22 from top to bottom until the lower circumferential surface of the sealing gasket B abuts against the top of the first limiting rod 21, and the installation is completed.

[0030] Of course, you can also design the dimensions of the corresponding gasket B and flange A on the first crossbar 111 and the second crossbar 112 in advance and make installation marks (such as scales, etc.), and adjust the height of the first limiting rod 21 in advance (the distance between its top and the top of the crossbar 11 should be equal to the difference between the radius of flange A and the radius of gasket B). Then, the bracket 1 is placed on the flange A in the above manner, and the two second limiting rods 22 are slid to the corresponding positions and locked with fasteners 8. Finally, the gasket B can be placed into the space defined between the two second limiting rods 22 and the first limiting rod 21 from top to bottom.

[0031] In addition to the above embodiments, the two limiting rods 2 can also be directly fixed to the corresponding vertical rods. That is, one end of each second limiting rod 22 is vertically inserted into the mounting hole of the corresponding vertical rod and can be positioned by a nut, while the other ends are distributed opposite each other and face the outer circumference of the sealing gasket B. In this case, the distance between the other end of each limiting rod 2 and the inner side of the corresponding vertical rod only needs to be adjusted to the difference between the radius of flange A and the radius of sealing gasket B. Obviously, such a solution can also achieve the purpose of the above embodiments.

Claims

1. A positioning jig for facilitating installation of a flange gasket, comprising a support (1), three limiting rods (2) arranged on the support (1) and capable of abutting against an outer circumferential surface of the gasket (B), characterized in that: The support (1) comprises a horizontal rod (11) capable of abutting against the outer circumferential surface of the flange (A), a first vertical rod (12) and a second vertical rod (13), wherein the horizontal rod (11) is composed of a first horizontal rod (111) and a second horizontal rod (112) connected by mutual insertion of adjacent ends, the first vertical rod (12) and the second vertical rod (13) are respectively slidably inserted into positioning holes (113) at the distal ends of the first horizontal rod (111) and the second horizontal rod (112), the upper ends of the first vertical rod (12) and the second vertical rod (13) respectively extend relative to a first limiting part (115) capable of abutting against the upper outer circumferential surface of the flange (A), the lower ends of the first vertical rod (12) and the second vertical rod (13) are connected by a tension spring (3) to make the first vertical rod (12) and the first horizontal rod (111) and the second vertical rod (13) and the second horizontal rod (112) always have a mutual approach trend, and a spring (4) is sleeved on the first vertical rod (12) and the second vertical rod (13) below the horizontal rod (11) to make the corresponding vertical rod always have a downward trend, the three limiting rods (2) are composed of a first limiting rod (21) on the center line of the horizontal rod (11) and two second limiting rods (22) symmetrically distributed about the first limiting rod (21), and a restraint member (5) is further arranged to make the first limiting rod (21) always be at the center line position of the horizontal rod (11).

2. The positioning fixture of claim 1, wherein: The first horizontal rod (111) and the second horizontal rod (112) are provided with a channel (114) extending transversely and penetrating up and down, and the lower end of the first limiting rod (21) is connected with the restraint member (5) after penetrating through the channel (114).

3. The positioning fixture of claim 2, wherein: Each second limiting rod (22) is also inserted up and down and is slidably constrained in the channel (114).

4. The positioning fixture of claim 3, wherein: The restraint member (5) comprises a positioning sleeve (51) limiting the lower end of the first limiting rod (21) and first and second inclined rods (52, 53) symmetrically distributed about the first limiting rod (21), the bottom end of the first inclined rod (52) is hinged to one side of the positioning sleeve (51), the top end of the first inclined rod (52) is hinged to the first horizontal rod (111), the bottom end of the second inclined rod (53) is hinged to the other side of the positioning sleeve (51), and the top end of the second inclined rod (53) is hinged to the second horizontal rod (112), and the first inclined rod (52) and the second inclined rod (53) are hinged to the corresponding second limiting rod (22) by a fastener (8).

5. The positioning fixture of claim 4, wherein: The lower end of the first limiting rod (21) is designed as a screw rod (211), a screw sleeve (6) is threadedly connected on the screw rod (211), and the positioning sleeve (51) is constrained on the screw sleeve (6) and can rotate relative to the circumferential direction.

6. The positioning fixture of claim 4, wherein: The first horizontal rod (111) and the second horizontal rod (112) are respectively slidably connected with a sliding block (7), and each second limiting rod (22) is slidably inserted into a insertion hole (71) of the corresponding sliding block (7).

7. The positioning fixture of claim 2, wherein: Each of the second limiting rods (22) is inserted into and positionable on the corresponding vertical rod at one end and oppositely distributed towards the outer circumferential surface of the sealing gasket (B) at the other end.

8. The positioning fixture of claim 1, wherein: The first limiting portion (115) is in linear contact with the outer circumferential surface of the flange (A).

9. The positioning fixture of claim 1, wherein: The bottom of the first vertical rod (12) and the second vertical rod (13) is partially expanded to form a second limiting portion (116), the lower end of each of the springs (4) is abutted on the corresponding second limiting portion (116), and the top end thereof is respectively abutted on the bottom of the horizontal rod (11).

10. The positioning fixture according to any one of claims 1 to 9, wherein: The end of the second limiting rod (22) is provided with a guide inclined surface (221) for insertion of the sealing gasket (B).

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