Two-lobed clamp-type quick-opening blind flange

Abstract

The two-clamp type quick-opening blind flange relates to the technical fields of natural gas, oil pipelines, and chemical containers. There are two clamps (3), which are respectively set on both sides of the edge of the blind flange cylinder (2). One end of the two clamps (3) is hinged to the blind flange cylinder (2). The free end of the clamp (3) is provided with a nut support (6). The nut support (6) is provided with a shaft hole. The nut (4) is provided with a short shaft (7). The nut (4) is fixed to the nut support (6) through the short shaft (7) and the shaft hole. The nut (4) is screwed to the two threads of the screw rod (5). The blind flange cylinder (2) is provided with a slider support (8) on the outside of the nut support (6). The slider support (8) is provided with a slide rail and a slider (9) that slides along the slide rail. The slider (9) is provided with a shaft hole. The two ends of the screw rod (5) are rotatably connected to the shaft hole of the slider (9). It has the advantages of simple structure, reasonable design, labor-saving opening and closing, easy operation, and easy processing and manufacturing.

Description

Technical Field

[0001] This invention relates to the technical fields of natural gas, oil pipelines, and chemical containers, and mainly to clamp-type quick-opening blind flanges. Background Technology

[0002] Currently, the vast majority of clamp-type quick-opening blind flanges in China are three-lobed clamp types, such as the patent application number CN03214073.8. For large quick-opening blind flanges, the operation of three-lobed clamp-type quick-opening blind flanges is extremely difficult. Especially for three-lobed clamp-type quick-opening blind flanges with heavy clamps, the entire weight of the clamp acts on the lead screw, making manual opening and closing of the clamp particularly strenuous, or even impossible. Existing two-lobed clamp-type quick-opening blind flanges abroad mostly use dual-drive mechanisms (upper and lower), with few single-drive mechanisms. Furthermore, the shaft support is located in the middle of the clamp opening and closing drive mechanism, resulting in a complex structure and difficulties in manufacturing. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a clamp-type quick-opening blind flange that is easy to operate, easy to manufacture, and easy to switch on and off, especially for large quick-opening blind flanges with heavy clamps.

[0004] The technical solution of this invention is: a two-part clamp-type quick-opening blind flange, including a blind flange head cover, a blind flange cylinder, a nut, and a screw. The clamp adopts a two-part structure, with two clamps respectively located on both sides of the edge of the blind flange cylinder. One end of the two clamps on the same side is hinged to the blind flange cylinder. The free end of the clamp is provided with a nut support, and the nut support has a shaft hole. The nut has a short shaft, and the nut is rotatably fixed to the nut support through the short shaft and the shaft hole. The screw has two sections of threads with opposite directions, and the nut is screwed onto the two sections of threads of the screw. The blind flange cylinder has a slider support outside the nut support. The slider support has a slide rail and a slider that slides along the slide rail. The slider has a shaft hole, and both ends of the screw are rotatably connected to the shaft holes of the slider. Rotating the screw can drive the clamp to open and close through the nut. When the screw opens and closes with the clamp, it can float along the slide rail through the slider.

[0005] The technical advantages of this invention are: the clamp opening and closing adopts a single-drive structure, which has the advantages of simple structure, reasonable design, labor-saving opening and closing, easy operation, and easy processing and manufacturing. Compared with the currently popular three-lobed clamp-type quick-opening blind flange in China, the gravity of the clamp acts on the hinge shaft support fixed on the blind flange cylinder, rather than entirely on the lead screw, making operation extremely labor-saving. Compared with the two-lobed clamp-type quick-opening blind flange using dual drive, it has a simpler structure and lower manufacturing difficulty and cost, and opening and closing is more convenient and labor-saving. Attached Figure Description

[0006] Figure 1 This is a front view of the structure of the present invention;

[0007] Figure 2 This is a top sectional view of the clamp opening and closing drive mechanism of the present invention;

[0008] Figure 3 This is a left view of the structure of the present invention;

[0009] Figure 4 This is a view of the blind flange head cover of the present invention in an open state.

[0010] The hinge assembly in the attached diagram is at the top. It should be noted that the hinge assembly can also be arranged at the bottom, while the corresponding clamp opening and closing mechanism is at the top. Detailed Implementation

[0011] like Figures 1 to 4 As shown, the two-lobed clamp-type quick-opening blind flange includes a blind flange head cover 1, a blind flange cylinder 2, clamps 3, a screw nut 4, and a screw rod 5. The screw nut 4 and screw rod 5 constitute the clamp opening and closing drive mechanism. The clamp 3 adopts a two-lobed structure, with two clamps 3 respectively located on both sides of the opening edge of the blind flange cylinder 2. One end of the two clamps 3 on the same side is hinged to the blind flange cylinder 2. The clamps 3 open and close around the hinge axis on both sides of the opening edge of the blind flange cylinder 2. The free end of the clamp 3 is provided with a screw nut support 6, and the screw nut support 6 has a shaft hole with the axial direction consistent with the axial direction of the blind flange cylinder 2. The screw nut 4 is provided with a short shaft 7, which is connected to the clamp. The hinge shafts at the joint of the clamp 3 are arranged parallel to each other. The nut 4 is rotatably fixed to the nut support 6 through a short shaft 7 and a shaft hole. The screw 5 has two sections of threads with opposite directions, and the nut 4 is screwed onto the two sections of threads of the screw 5 respectively. The blind plate cylinder 2 has a slider support 8 on the outside of the nut support 6. The slider support 8 has a slide rail and a slider 9 that slides along the slide rail. The slider 9 has a shaft hole, and the two ends of the screw 5 are rotatably connected to the shaft hole of the slider 9. Rotating the screw 5 can drive the clamp 3 to open and close through the nut 4. When the screw 5 opens and closes with the clamp 3, it can float up and down along the slide rail through the slider 9. The slider 9 can only slide up and down along the slide rail, which, together with the nut 4 and the screw 5, restricts the position of the clamp 3. The screw 5 and the slider 9 are connected by a bearing.

[0012] The nut support 6 includes two inner and outer legs 10. Each of the two legs 10 is provided with a shaft hole for connecting the short shaft 7 on the nut 4. There are two short shafts 7 on the nut 4, which respectively cooperate with the shaft holes on the inner and outer legs 10. The two short shafts 7 are coaxially arranged on both sides of the nut 4.

[0013] The two clamps 3 are hinged to the blind flange cylinder 2 via the same hinge axis.

[0014] The blind flange cylinder 2 is fixed with a hinge shaft fixing seat 11 extending outward, and the clamp 3 is hinged to the blind flange cylinder 2 through the hinge shaft fixing seat 11.

[0015] The blind flange cylinder 2 is fixed with a fixing part 12 extending outward, and the slider support 8 is fixedly connected to the fixing part 12.

[0016] Both the blind flange head cover and the outer ring of the blind flange cylinder have a flange ring. The blind flange head cover opening and closing mechanism brings them together. The inner rings of the left and right clamps each have grooves. The clamp opening and closing drive mechanism causes the two clamps to open and close around a hinge axis, causing the grooves on their inner rings to engage with the flanges on the outer rings of the blind flange head cover and the blind flange cylinder, preventing internal forces from pushing the blind flange head cover open. The lead screw forms a threaded pair with two upper nuts. The end of the lead screw has a hexagonal or square head. Twisting it with a wrench rotates the lead screw clockwise or counterclockwise, thus opening and closing the clamps.

Claims

1. A two-part clamp-type quick-opening blind flange, comprising a blind flange head cover (1), a blind flange cylinder (2), a clamp (3), a nut (4), and a screw (5), characterized in that, The clamp (3) adopts a two-part structure. There are two clamps (3), which are respectively located on both sides of the edge of the blind plate cylinder (2). One end of the two clamps (3) on the same side is hinged to the blind plate cylinder (2). The free end of the clamp (3) is provided with a nut support (6). The nut support (6) is provided with a shaft hole. The nut (4) is provided with a short shaft (7). The nut (4) is rotatably fixed on the nut support (6) through the short shaft (7) and the shaft hole. The lead screw (5) is provided with two sections of threads with opposite directions. The nut (4) is screwed onto the two threads of the lead screw (5). The blind plate cylinder (2) is provided with a slider support (8) on the outside of the nut support (6). The slider support (8) is provided with a slide rail and a slider (9) that slides along the slide rail. The slider (9) is provided with a shaft hole. The two ends of the lead screw (5) are rotatably connected to the shaft hole of the slider (9). When the lead screw (5) is rotated, the clamp (3) can be opened and closed through the nut (4). When the lead screw (5) opens and closes with the clamp (3), it can float along the slide rail through the slider (9).

2. The two-lobed clamp-type quick-opening blind flange as described in claim 1, characterized in that, The nut support (6) includes two inner and outer feet (10). The two feet (10) are respectively provided with shaft holes for connecting the short shafts (7) on the nut (4). There are two short shafts (7) on the nut (4), and the two short shafts (7) are coaxially arranged on both sides of the nut (4).

3. The two-lobed clamp-type quick-opening blind flange as described in claim 1, characterized in that, The two clamps (3) are hinged to the blind flange cylinder (2) via the same hinge axis.

4. The two-lobed clamp-type quick-opening blind flange as described in claim 1, characterized in that, The blind plate cylinder (2) is fixed with a hinge shaft fixing seat (11) extending outward, and the clamp (3) is hinged to the blind plate cylinder (2) through the hinge shaft fixing seat (11).

5. The two-lobed clamp-type quick-opening blind flange as described in any one of claims 1 to 4, characterized in that, The blind plate cylinder (2) is fixed with a fixing part (12) extending outward, and the slider support (8) is fixedly connected to the fixing part (12).

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