Adjustable lock catch and quick-cutting blind plate device with same

Abstract

An adjustable lock catch and a quick-cutting blind plate device with the adjustable lock catch belong to the technical field of lock catches, are connected between a crank connecting rod and a second connecting rod of which one ends are rotatably connected, and comprise a sleeve sliding block, a first connecting rod, a second connecting rod, a first connecting rod and a second connecting rod, the second eccentric shaft is fixedly connected to the second connecting rod; the adjustable lock catch panel is provided with a guide rail, the sleeve sliding block is slidably connected into the guide rail, and a notch used for clamping the second eccentric shaft is formed in one side of the adjustable lock catch panel; the adjusting screw is in threaded connection with the adjustable lock catch panel and the sleeve sliding block, and the adjusting screw rotates to drive the sleeve sliding block to move along the guide rail. Under the conditions that safety is guaranteed and tolerance requirements of other parts do not need to be improved, mass production of the lock catch is achieved, universality is enhanced, production efficiency is improved, and cost is prevented from being increased.

Description

Technical Field

[0001] This application belongs to the field of locking technology and relates to a quick-cut blind plate device with an adjustable locking mechanism. Background Technology

[0002] The quick-cut blind flange device is a new type of pipeline cutting equipment. It does not require any auxiliary tools and can be completed by one person in tens of seconds to minutes. It can completely replace traditional blind flanges such as figure-eight blind flanges, insert plates and gaskets, and realize the rapid isolation or connection of pipelines.

[0003] Quick-cut blind flange devices are categorized into wrench-type, handwheel-type, pneumatic, and electric types based on their actuators. The locking mechanism is the locking component in wrench-type quick-cut blind flange devices. As a safety measure, it plays a crucial role in locking the device after the wrench is in position, preventing accidental opening by workers and thus significantly improving the safety of the device. Currently, due to accumulated design dimensional tolerances or machining errors, even quick-cut blind flange devices with the same diameter may not have fully engaged locking mechanisms, leading to installation failures or inability to lock properly. To solve this problem, the locking mechanism must be machined after the device is assembled, measuring the specific location. However, this lack of versatility in locking mechanism manufacturing severely impacts production and assembly schedules. Summary of the Invention

[0004] The technical problem solved by this application is to overcome the shortcomings of the prior art and provide a quick-cut blind plate device with an adjustable latch, which enables mass production of the latch while ensuring safety and without increasing the tolerance requirements of other parts, thereby enhancing versatility, improving production efficiency, and avoiding increased costs.

[0005] The technical solution provided in this application is as follows:

[0006] An adjustable latch, connected between a crank connecting rod and a second connecting rod rotatably connected at one end, includes:

[0007] The sleeve slider is rotatably connected to the crank connecting rod via a locking screw;

[0008] The second eccentric shaft is fixedly connected to the second connecting rod;

[0009] The adjustable locking panel is equipped with a guide rail, and the sleeve slider is slidably connected in the guide rail. One side is provided with a notch for locking the second eccentric shaft.

[0010] The adjusting screw is threaded to the adjustable locking panel and the sleeve slider. Rotating the adjusting screw causes the sleeve slider to move along the guide rail.

[0011] Furthermore, the adjusting screw includes a nut, a first threaded section, and a second threaded section arranged in sequence. The diameter of the first threaded section is greater than the diameter of the second threaded section, and the pitch of the first threaded section is greater than the pitch of the second threaded section. The second threaded section is connected to the threaded hole of the sleeve slider, and the first threaded section is threadedly connected to the adjustable locking panel.

[0012] Furthermore, a nut is threaded onto the first threaded section. After the adjusting screw is turned into position, the nut is rotated until it contacts the adjustable locking panel.

[0013] Furthermore, the sleeve slider includes a slider and a sleeve, which are fixedly connected. The slider has a threaded hole, an adjusting screw is threadedly connected to the threaded hole, and a locking screw passes through the sleeve and is connected to the crank connecting rod.

[0014] Furthermore, a latch handle is fixedly connected to the adjustable latch panel.

[0015] Furthermore, a torsion spring shaft is fixedly connected to the crank connecting rod. The center of the torsion spring is fixed on the torsion spring shaft, one side is fitted onto the locking screw connected to the sleeve slider, and the other side rests on the locking handle, so that the torsion spring applies an elastic force to the locking handle, and the locking handle drives the recess of the adjustable locking panel to fit tightly against the second eccentric shaft.

[0016] Furthermore, the latch handle is provided with a groove, and one side of the torsion spring rests in the groove of the latch handle.

[0017] A quick-cut blind flange device with an adjustable locking mechanism as described above includes: an upper valve body, a lower valve body, a blind flange, a crank connecting rod, a first eccentric shaft, a second eccentric shaft, a first concentric shaft, and a second concentric shaft. The ends of the upper and lower valve bodies are opposite each other. Both ends of the upper valve body are connected to a first flange, and both ends of the lower valve body are connected to a second flange. The first and second concentric shafts are located on both sides of the upper valve body and between the two first flanges. The first and second eccentric shafts are located on both sides of the lower valve body and between the two second flanges. The axes of the first and second eccentric shafts and the first and second concentric shafts are parallel. Fixed rods are rotatably connected between the first and second concentric shafts, between the first and second eccentric shafts, between the second and second eccentric shafts, and between the first and second eccentric shafts. The first eccentric shaft is fixedly connected to one end of the first connecting rod, and the other end of the first connecting rod is rotatably connected to the crank connecting rod. The second eccentric shaft is fixedly connected to one end of the second connecting rod, and the other end of the second connecting rod is connected to the crank connecting rod. An adjustable lock is connected between the crank connecting rod and the second connecting rod.

[0018] In summary, this application includes at least the following beneficial technical effects:

[0019] This application discloses a quick-cut blind flange device with an adjustable locking mechanism, replacing the traditional locking mechanism. This adjustable locking mechanism allows for adjustment of the locking distance, making it suitable for quick-cut blind flange devices with different cumulative machining tolerances but the same diameter.

[0020] The locking mechanism features a simple structure, long adjustment range, ease of use, and high safety. It is widely used in industries or facilities such as oil refining, chemical engineering, offshore oil and gas extraction, and long-distance pipelines for boundary isolation, material separation, periodic maintenance, and frequent switching, where complete isolation is required.

[0021] The quick-cut blind flange device with adjustable latch described in this application has high safety. Compared with quick-cut blind flange devices using traditional latches, it can adjust the locking distance of the latch, making it more versatile and having good mobility. When it reaches the locking position, the latch can automatically spring back and engage, making it more convenient to use. Attached Figure Description

[0022] Figure 1 Schematic diagram of a wrench-type quick-cut blind flange device.

[0023] Figure 2 Schematic diagram of the adjustable latch structure from the front.

[0024] Figure 3 Schematic diagram of the adjustable latch structure from the side.

[0025] Figure 4 Schematic diagram of the side view of the sleeve slider structure.

[0026] Figure 5 Side view of the adjusting screw.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1-Upper valve body; 2-Lower valve body; 3-Blind plate; 4-First eccentric shaft; 5-Second eccentric shaft; 6-First concentric shaft; 7-Second concentric shaft; 8-Wrench; 9-Lock panel; 10-Lock screw; 11-Lock fixing bolt; 12-Crank connecting rod;

[0029] 13-Adjusting screw; 14-Sleeve slider;

[0030] 15-Torsion spring; 16-Torsion spring shaft; 17-Adjustable latch panel; 18-Latch handle; 19-Nut;

[0031] 20 - First thread segment; 21 - Second thread segment. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments disclosed in this application will be described in further detail below with reference to the accompanying drawings.

[0033] This application discloses a quick-cut blind plate device with an adjustable latch, such as... Figure 1 As shown, the quick-cut blind flange device mainly consists of an upper valve body 1, a lower valve body 2, a blind flange 3, a first eccentric shaft 4 and a second eccentric shaft 5, a first concentric shaft 6 and a second concentric shaft 7, etc. The structure of the wrench-type quick-cut blind flange device is as follows: Figure 1 The upper valve body 1 and the lower valve body 2 are positioned opposite each other. Both ends of the upper valve body 1 are connected to first flanges, and both ends of the lower valve body 2 are connected to second flanges. A first concentric shaft 6 and a second concentric shaft 7 are located on both sides of the upper valve body 1 and between the two first flanges. A first eccentric shaft 4 and a second eccentric shaft 5 are located on both sides of the lower valve body 2 and between the two second flanges. The axes of the first eccentric shaft 4 and the second eccentric shaft 5, the first concentric shaft 6 and the second concentric shaft 7 are parallel. Fixed rods are rotatably connected between the first concentric shaft 6 and the second concentric shaft 7, between the first eccentric shaft 4 and the first concentric shaft 6, between the second eccentric shaft 5 and the second concentric shaft 7, and between the first eccentric shaft 4 and the second eccentric shaft 7. The first eccentric shaft 4 is fixedly connected to one end of the first connecting rod, and the other end of the first connecting rod is rotatably connected to the crank connecting rod 12. The second eccentric shaft 5 is fixedly connected to one end of the second connecting rod, and the other end of the second connecting rod is connected to the crank connecting rod 12. A wrench 8 is fixedly connected to the first connecting rod. Its working principle is as follows, taking the initial closed state as an example: turn the wrench 8 counterclockwise, and the wrench 8 drives the first eccentric shaft 4 on the lower valve body 2 to rotate. During the rotation, the distance between the upper valve body 1 and the lower valve body 2 is continuously increased through the mechanical structure, so that there is enough space for movement on both sides of the blind plate 3. Then push and pull the blind plate 3 to complete the switching between open and closed blind plates. Then turn the wrench 8 clockwise. At this time, the distance between the upper valve body 1 and the lower valve body 2 is continuously reduced during the rotation until the blind plate 3 is pressed tightly, completing one switching.

[0034] The traditional locking mechanism mainly consists of a locking panel 9, a locking screw 10, and a locking fixing bolt 11. During the rotation of the wrench 8, the relative position of the axis of the second eccentric shaft 5 and the axis of the locking screw 10 fixed on the crank connecting rod 12 continuously changes. The working principle of the locking mechanism is that when the quick-cut blind flange device reaches the clamping state, it locks the distance between the axis of the second eccentric shaft 5 and the axis of the locking screw 10. Only by locking this distance can the quick-cut blind flange device be locked, achieving a safe and leak-free effect. The traditional locking mechanism has a fixed distance. Due to the cumulative processing errors, the locking mechanism is not universal for different quick-cut blind flange devices. The locking panel 9 needs to be reworked based on the assembly and debugging results, thus delaying the production cycle.

[0035] The adjustable locking structure proposed in this application is as follows: Figure 2 and Figure 3 As shown, the adjustable latch mainly consists of a latch screw 10, an adjusting screw 13, a sleeve slider 14, a torsion spring 15, a torsion spring shaft 16, an adjustable latch panel 17, and a latch handle 18.

[0036] The relationship between the parts is as follows: The main body of the adjustable latch is the adjustable latch panel 17. The sleeve slider 14 is located in the guide rail of the latch panel 17. The latch handle 18 is fixed to the latch panel 17 by thread or welding. The adjusting screw 13 is connected to the adjustable latch panel 17 and the sleeve slider 14 by thread. The torsion spring shaft 16 is fixed to the crank connecting rod 12. The latch screw 10 passes through the sleeve slider 14 and is connected to the crank connecting rod 12.

[0037] Implementation of the adjustable function: For quick-cut blind flange devices of the same specifications but with different cumulative machining tolerances, the vertical distance between the crank connecting rod 12 and the second eccentric shaft 5 is not the same. To adapt to all quick-cut blind flange devices of the same specifications, it is necessary to change the distance between the locking screw 10 and the recess of the adjustable locking panel 17. The recess of the adjustable locking panel 17 is the mating point between the locking screw and the second eccentric shaft 5. A guide rail slider structure is adopted, and the structure of the sleeve slider 14 is as follows: Figure 4 As shown, when the sleeve slider 14 moves within the guide rail, the distance between the locking screw 10 and the recess of the adjustable locking panel 17 changes accordingly. To restrict the sleeve slider 14 to a specific position within the guide rail, the adjusting screw 13 is needed for position fixing and adjustment. The structure of the adjusting screw 13 is as follows: Figure 5 As shown, this is a two-stage thread structure with different diameters. The first thread segment 20 is a large-pitch thread with a pitch of p1; the second thread segment 21 is a small-pitch thread with a pitch of p2, where p1 > p2. The adjustment process is as follows: During installation, the sleeve slider 14 is fixedly placed at the top of the guide rail, and the adjusting screw 13 is screwed in. During this process, the second thread segment 21 of the adjusting screw 13 first connects with the threaded hole of the sleeve slider 14. After screwing in a certain distance, the first thread segment 20 begins to connect with the adjustable locking panel 17. Then, the adjusting screw 13 is continued to be screwed in. Because the two thread segments have different pitches, the sleeve slider 14 moves downwards by a distance (p1-p2) for each rotation of the adjusting screw 13, thereby achieving free adjustment of the locking installation size. Finally, the nut 19 is tightened to prevent the adjusting screw 13 from loosening and coming out.

[0038] The function of the torsion spring 15 is realized as follows: the center of the torsion spring 15 is fixed on the torsion spring shaft 16, one side is sleeved on the cylindrical section of the sleeve slider 14, and the other side rests at a certain angle in the groove of the latch handle 18, applying a rightward elastic force to the latch handle 18, so that the recess of the adjustable latch panel 17 is tightly attached to the second eccentric shaft 5. This ensures that the latch does not come off and also realizes the function of automatic latch engagement when the quick-cut blind plate device is closed.

[0039] The overall structural design of this application is ingenious. Compared with traditional locks, the adjustable lock can adjust the locking distance. Under the condition of ensuring safety and not increasing the tolerance requirements of other parts, it is fully compatible with quick-cut blind plate devices with different cumulative tolerances under the same specifications. It avoids cumbersome assembly work, realizes the mass production of locks, and enhances versatility.

[0040] To achieve the adjustable locking distance, this application employs a combination mechanism of a guide rail slider and an adjusting screw. The adjusting screw has a double-threaded structure with different pitches on the two threads. By rotating the adjusting screw, the distance difference generated by the two threads is used to adjust the position of the sleeve slider within the guide rail, thus achieving the function of adjusting the distance.

[0041] To improve the safety of the adjustable latch, this application employs a torsion spring structure, which ensures the latch does not disengage through the force applied by the torsion spring. Furthermore, when closing the quick-cut blind plate device, the torsion spring structure provides the adjustable latch with good mobility, allowing it to automatically spring back and engage when it reaches the locking position.

[0042] The realization of the above-mentioned functions and technical requirements is determined by the unique technical solution of this application.

[0043] The contents not described in detail in this application specification are common knowledge to those skilled in the art.

[0044] The present application has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present application. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and implementation methods of the present application without departing from the spirit and scope of the present application, and all such modifications and improvements fall within the scope of the present application. The scope of protection of the present application is determined by the appended claims.

Claims

1. An adjustable latch, characterized in that, Connected between a crank connecting rod (12) and a second connecting rod, which are rotatably connected at one end, including: The sleeve slider (14) is rotatably connected to the crank connecting rod (12) by the locking screw (10); The second eccentric shaft (5) is fixedly connected to the second connecting rod; The adjustable locking panel (17) is equipped with a guide rail, and the sleeve slider (14) is slidably connected in the guide rail. One side is provided with a notch for locking the second eccentric shaft (5). An adjusting screw (13) is threadedly connected to an adjustable locking panel (17) and a sleeve slider (14). The rotation of the adjusting screw (13) causes the sleeve slider (14) to move along the guide rail.

2. The adjustable latch according to claim 1, characterized in that: The adjusting screw (13) includes a nut, a first threaded section (20), and a second threaded section (21) arranged in sequence. The diameter of the first threaded section (20) is greater than the diameter of the second threaded section (21), and the pitch of the first threaded section (20) is greater than the pitch of the second threaded section (21). The second threaded section (21) is connected to the threaded hole of the sleeve slider (14), and the first threaded section (20) is threadedly connected to the adjustable locking panel (17).

3. An adjustable latch according to claim 2, characterized in that: A nut (19) is threaded onto the first threaded section (20). After the adjusting screw (13) is turned into place, the nut (19) is rotated until it contacts the adjustable locking panel (17).

4. An adjustable latch according to claim 1, characterized in that: The sleeve slider (14) includes a slider and a sleeve, which are fixedly connected. The slider has a threaded hole, and the adjusting screw (13) is threadedly connected to the threaded hole. The locking screw (10) passes through the sleeve and is connected to the crank connecting rod (12).

5. An adjustable latch according to claim 1, characterized in that: A latch handle (18) is fixedly connected to the adjustable latch panel (17).

6. An adjustable latch according to claim 5, characterized in that: A torsion spring shaft (16) is fixedly connected to the crank connecting rod (12). The center of the torsion spring (15) is fixed on the torsion spring shaft (16). One side is fitted onto the locking screw (10) connected to the sleeve slider (14), and the other side rests on the locking handle (18) so that the torsion spring (15) applies an elastic force to the locking handle (18). The locking handle (18) drives the recess of the adjustable locking panel (17) to be tightly pressed against the second eccentric shaft (5).

7. An adjustable latch according to claim 6, characterized in that: The latch handle (18) has a groove, and one side of the torsion spring (15) rests in the groove of the latch handle (18).

8. A quick-cut blind plate device having an adjustable latch as described in any one of claims 1-7, characterized in that, include: Upper valve body (1), lower valve body (2), blind plate (3), crank connecting rod (12), first eccentric shaft (4), second eccentric shaft (5), first concentric shaft (6) and second concentric shaft (7), the ends of the upper valve body (1) and the lower valve body (2) are opposite each other, both ends of the upper valve body (1) are connected to the first flange, both ends of the lower valve body (2) are connected to the second flange, the first concentric shaft (6) and the second concentric shaft (7) are located on both sides of the upper valve body (1) and between the two first flanges, the first eccentric shaft (4) and the second eccentric shaft (5) are located on both sides of the lower valve body (2) and between the two second flanges; the first eccentric shaft (4) and the second eccentric shaft (5), the first The axes of the concentric shaft (6) and the second concentric shaft (7) are parallel. Fixed rods are rotatably connected between the first concentric shaft (6) and the second concentric shaft (7), between the first eccentric shaft (4) and the first concentric shaft (6), between the second eccentric shaft (5) and the second concentric shaft (7), and between the first eccentric shaft (4) and the second eccentric shaft (5). The first eccentric shaft (4) is fixedly connected to one end of the first connecting rod, and the other end of the first connecting rod is rotatably connected to the crank connecting rod (12). The second eccentric shaft (5) is fixedly connected to one end of the second connecting rod, and the other end of the second connecting rod is connected to the crank connecting rod (12). An adjustable lock is connected between the crank connecting rod (12) and the second connecting rod.

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