Pre-tightening device for large valve

Abstract

The utility model relates to the technical field of vacuum valves, in particular to a pre-tightening device for a large valve, which comprises a first pre-tightening mechanism and a second pre-tightening mechanism which are mounted on the valve, the first pre-tightening mechanism is positioned at the top of the valve, and the second pre-tightening mechanism is positioned at the bottom of the valve. According to the technical scheme, multi-connecting-rod rigid connection of a traditional pre-tightening mechanism is replaced, the pre-tightening process of the valve is divided into the two processes of alignment with the flange and pressing with the flange, alignment of the valve and the flange is achieved through the two processes of coarse adjustment and fine adjustment, the alignment precision between the valve and the flange is guaranteed, and the valve and flange assembly efficiency is improved. And the first pre-tightening mechanism and the second pre-tightening mechanism are separately pressed with the upper part and the lower part of the valve, so that the tightness between the valve and the flange is ensured, the pre-tightening force of the vacuum valve meets the requirement, and in addition, the processing cost and the mounting difficulty of the pre-tightening mechanisms are effectively reduced through the first pre-tightening mechanism and the second pre-tightening mechanism.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum valves, in particular to a pre-tightening device for large valves. Background Art

[0002] Vacuum valves are usually used to control the on / off of pipelines. They are generally divided into medium and large vacuum valves (diameter 3 meters and above) and small vacuum valves. In order to ensure the airtightness of the vacuum valve, it is generally necessary to apply pre-tightening force to the valve.

[0003] The pre-tightening mechanism used to apply pre-tightening force on traditional valves is generally a multi-link rigid connection, which ensures the tightness between the valve and the flange by squeezing the valve. It is commonly used in small and medium-sized valves. However, in some non-standard large valves, the pre-tightening mechanism of the connecting rod structure has a complex structure, and has strict requirements on the processing accuracy of form and position tolerances such as the parallelism and flatness of the valve core. Its processing and installation process is complicated, which makes the cost of this pre-tightening mechanism high.

[0004] Therefore, it is necessary to propose a pre-tightening device for large valves, so as to reduce the processing cost of the pre-tightening mechanism while ensuring the pre-tightening force of the large vacuum valve. Utility Model Content

[0005] The purpose of the utility model is to solve the problem that the processing cost of the pre-tightening mechanism of the existing vacuum valve is very high, and a pre-tightening device for a large valve is provided.

[0006] The technical solution of the utility model is:

[0007] A pre-tightening device for a large valve comprises a first pre-tightening mechanism and a second pre-tightening mechanism mounted on the valve, wherein the first pre-tightening mechanism is located at the top of the valve and the second pre-tightening mechanism is located at the bottom of the valve;

[0008] The first pre-tightening mechanism includes a crossbeam, a traveling mechanism, a sliding mechanism, and a first push plate. The crossbeam is arranged on the top of the valve and is perpendicular to the valve. The traveling mechanism is fixed to both ends of the crossbeam. The sliding mechanism is slidably connected to the crossbeam. The first push plate is fixedly connected to the valve. The sliding mechanism drives the first push plate to move so as to press the valve and the flange together.

[0009] The second pre-tightening mechanism includes a second push plate, a baffle and a first driving device. The second push plate is fixedly connected to the valve. The baffles are arranged on both sides of the second push plate in a direction perpendicular to the valve. The first driving device drives the baffles to move closer to or away from the second push plate.

[0010] Furthermore, the sliding mechanism includes a second driving device and a support frame, a first slider is provided at both ends of the support frame, and sliding grooves for accommodating the first slider are provided on both sides of the beam. When the second driving device drives the support frame to move, the first slider slides along the sliding groove.

[0011] Furthermore, a first roller is mounted on the first slider. When the first slider slides in the sliding groove, the first roller contacts the sliding groove and rolls relative to the sliding groove.

[0012] Furthermore, a second slider is fixedly connected to the bottom of the second push plate, and a second roller is installed on the second slider. When the baffle approaches the second push plate, the second roller contacts the baffle and rolls relative to the baffle.

[0013] Furthermore, a multi-joint connection mechanism is provided between the first push plate and the support frame, one end of the multi-joint connection mechanism is fixedly connected to the first push plate, and the other end of the multi-joint connection mechanism is rotatably connected to the support frame.

[0014] Furthermore, the multi-joint connection mechanism includes a first joint, a second joint and a joint arm located between the first joint and the second joint, the joint arm is rotatably connected to the first joint and the second joint respectively, the first joint is rotatably connected to the support frame through a first pin shaft, the first joint is rotatably connected to the joint arm through a second pin shaft, the second joint is rotatably connected to the joint arm through a third pin shaft, and the second joint is fixedly connected to the first push plate.

[0015] Furthermore, the axis of the first pin shaft is perpendicular to the valve, the axis of the second pin shaft is parallel to the valve, and the axis of the third pin shaft is parallel to the valve.

[0016] Furthermore, there are at least two crossbeams, and the crossbeams are parallel to each other, and each baffle is installed with at least two first driving devices.

[0017] Furthermore, there are at least two second driving devices, each crossbeam corresponds to a second driving device, and there are at least four first sliding blocks, each crossbeam is equipped with a first sliding block on both sides.

[0018] Furthermore, at least two first push plates are provided, and the first push plates are respectively provided at both ends of the support frame, and each end of the support frame is installed with a multi-joint connection mechanism.

[0019] The utility model relates to a pre-tightening device for large valves. The walking mechanism can drive the valve to move, so that the valve is initially aligned with the flange to achieve coarse adjustment. Then the sliding mechanism moves relative to the crossbeam, driving the first push plate to move in the direction close to the flange, so that the valve fits the flange to achieve fine adjustment. Then the sliding mechanism continues to move, driving the top of the valve to be pressed against the flange. At the same time, the second pre-tightening mechanism located at the bottom of the valve cooperates with the first pre-tightening mechanism to operate synchronously. The first driving device drives the baffle to approach the second push plate, driving the second push plate to move toward the flange, thereby pressing the bottom of the valve against the flange as well, completing the pre-tightening process of the valve. Compared with the traditional technology, the present technical solution is more Instead of the multi-link rigid connection of the traditional pre-tightening mechanism, the pre-tightening process of the valve is divided into two processes: alignment with the flange and pressing with the flange. The alignment of the valve and the flange is achieved through the coarse adjustment and fine adjustment processes, which ensures the alignment accuracy between the valve and the flange. The first pre-tightening mechanism and the second pre-tightening mechanism are respectively pressed separately with the upper and lower parts of the valve to ensure the tightness between the valve and the flange, so that the pre-tightening force of the vacuum valve meets the requirements. In addition, whether it is the first pre-tightening mechanism or the second pre-tightening mechanism, the processing accuracy and installation accuracy requirements of the structural components therein are not high. Compared with the connecting rod structure, the processing cost and installation difficulty of the pre-tightening mechanism are effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural reference diagram of the utility model;

[0021] Figure 2 For this utility model Figure 1 A partial enlarged view of the middle A;

[0022] Figure 3 This is a structural reference diagram of the first locking mechanism of the present utility model;

[0023] Figure 4 This is a combined view of the baffle and the first driving device of the utility model;

[0024] Figure 5 For this utility model Figure 3 A partial enlarged view of point B in the middle;

[0025] Figure 6 For this utility model Figure 3 A partial enlarged view of point C in the middle;

[0026] Figure 7 This is a reference diagram of the use status of this utility model.

[0027] Figure numerals: 1. first pre-tightening mechanism; 2. second pre-tightening mechanism; 3. valve; 4. crossbeam; 5. walking mechanism; 6. sliding mechanism; 7. first push plate; 8. second push plate; 9. baffle; 10. first driving device; 11. second driving device; 12. support frame; 13. first slider; 14. sliding groove; 15. first roller; 16. second slider; 17. second roller; 18. multi-joint connection mechanism; 19. first joint; 20. second joint; 21. joint arm; 22. first pin; 23. second pin; 24. third pin; 25. flange; 26. limiting device. DETAILED DESCRIPTION

[0028] In order to make the technical means, technical features, purpose of the utility model and technical effects achieved by the utility model easier to understand, the utility model is further explained below with reference to specific illustrations.

[0029] Example 1:

[0030] like Figure 1 and Figure 2 As shown, this embodiment provides a pre-tightening device for a large valve, including a first pre-tightening mechanism 1 and a second pre-tightening mechanism 2 installed on the valve 3, the first pre-tightening mechanism 1 is located at the top of the valve 3, and the second pre-tightening mechanism 2 is located at the bottom of the valve 3. The first pre-tightening mechanism 1 includes a beam 4, a walking mechanism 5, a sliding mechanism 6 and a first push plate 7. The beam 4 is provided at the top of the valve 3 and is perpendicular to the valve 3. The walking mechanism 5 is respectively fixed to both ends of the beam 4 by screws or welding. The sliding mechanism 6 is slidably connected to the beam 4. The first push plate 7 is welded or screwed to the valve 3. The sliding mechanism 6 drives the first push plate 7 to move so as to press the valve 3 and the flange 25 together. Figure 2 and Figure 4 As shown, the second pre-tightening mechanism 2 includes a second push plate 8, a baffle 9 and a first driving device 10. The second push plate 8 is welded or fixed to the valve 3 with screws. The baffle 9 is arranged on both sides of the second push plate 8 in a direction perpendicular to the valve 3. The first driving device 10 drives the baffle 9 to move closer to or away from the second push plate 8.

[0031] Preferably, Figure 3 As shown, the sliding mechanism 6 includes a second driving device 11 and a support frame 12. The second driving device 11 is fixedly connected to the crossbeam 4 by screws. The first slider 13 is fixed with screws at both ends of the support frame 12. Sliding grooves 14 for accommodating the first slider 13 are provided on both sides of the crossbeam 4. When the second driving device 11 drives the support frame 12 to move, the first slider 13 slides along the sliding groove 14.

[0032] Preferably, Figure 5As shown, a first roller 15 is installed on the first slider 13. When the first slider 13 slides in the sliding groove 14, the first roller 15 contacts the sliding groove 14 and rolls relative to the sliding groove 14. The first roller 15 can reduce the friction between the first slider 13 and the sliding groove 14 to ensure smooth operation of the mechanism.

[0033] Preferably, Figure 2 As shown, the bottom screw of the second push plate 8 is fixedly connected with the second slider 16, and the second roller 17 is installed on the second slider 16. When the baffle 9 approaches the second push plate 8, the second roller 17 contacts the baffle 9 and rolls relative to the baffle 9. The second roller 17 can reduce the friction after the second slider 16 contacts the second push plate 8, thereby ensuring smoothness of the mechanism.

[0034] Preferably, Figure 6 As shown, a multi-joint connection mechanism 18 is provided between the first push plate 7 and the support frame 12, one end of the multi-joint connection mechanism 18 is fixedly connected to the first push plate 7, and the other end of the multi-joint connection mechanism 18 is rotatably connected to the support frame 12. Specifically, the multi-joint connection mechanism 18 includes a first joint 19, a second joint 20, and a joint arm 21 located between the first joint 19 and the second joint 20. The joint arm 21 is rotatably connected to the first joint 19 and the second joint 20 respectively. The first joint 19 is rotatably connected to the support frame 12 through a first pin 22, and the first joint 19 is rotatably connected to the joint arm 21 through a second pin 22. The pin 23 is rotatably connected, the second joint 20 and the articulated arm 21 are rotatably connected through the third pin 24, and the second joint 20 is fixedly connected to the first push plate 7 by screws. Preferably, the axis of the first pin 22 is perpendicular to the valve 3, the axis of the second pin 23 is parallel to the valve 3, and the axis of the third pin 24 is parallel to the valve 3. Since the valve 3 will generate a large momentum at the moment of starting and stopping due to the large mass of the valve 3, in order to reduce the damage caused by the momentum of the valve 3 to the walking mechanism 5 and the sliding mechanism 6, the use of a multi-joint connection structure can effectively reduce the influence of the valve core on each motion mechanism.

[0035] Preferably, there are at least two crossbeams 4 , and the crossbeams 4 are parallel to each other. Each baffle 9 is installed with at least two first driving devices 10 , and the first driving devices 10 are fixed to the valve body by screws.

[0036] Preferably, there are at least two, preferably two, second drive devices 11 , and each beam 4 corresponds to a second drive device 11 . There are at least four, preferably four, first sliders 13 , and a first slider 13 is installed on both sides of each beam 4 .

[0037] Preferably, at least two, preferably two, first push plates 7 are provided. The first push plates 7 are respectively provided at both ends of the support frame 12 , and a multi-joint connection mechanism 18 is installed at each end of the support frame 12 .

[0038] Preferably, Figure 5 As shown, a limiting device 26 is provided on both sides of each first slider 13 for limiting the movement stroke of the sliding mechanism 6. The limiting device 26 can be a laser sensor, an infrared sensor or other distance sensor, or a limit switch triggered by pressing.

[0039] The first driving device 10 and the second driving device 11 can be electric cylinders, air cylinders, or hydraulic cylinders, and those skilled in the art can select them according to actual conditions.

[0040] In addition, the walking mechanism 5 in the first preload mechanism 1, also called a walking trolley, is installed on a guide rail for movement. The guide rail screws are fixedly installed on the valve housing of the entire vacuum valve. The entire vacuum valve consists of a valve housing. A through hole for gas to pass through is provided on the valve housing, and the valve is used to block the through hole. The walking mechanism 5 is driven by a motor to move along the guide rail. The guide rail is a double-row parallel guide rail, which is arranged on both sides of the valve 3. Since the walking mechanism 5 is a relatively mature technical means at present and is relatively common on the market, technicians in this field can choose the model and category of the walking mechanism 5 according to actual conditions, and this article will not go into details here.

[0041] When using, such as Figure 7 As shown, the walking mechanism 5 can drive the valve 3 to move, so that the valve 3 is initially aligned with the flange 25 to achieve coarse adjustment, and then the sliding mechanism 6 moves relative to the crossbeam 4, driving the first push plate 7 to move in the direction close to the flange 25, so that the valve 3 fits the flange 25 to achieve fine adjustment, and then the sliding mechanism 6 continues to move, driving the top of the valve 3 to be pressed against the flange 25, and at the same time, the second pre-tightening mechanism 2 at the bottom of the valve 3 cooperates with the first pre-tightening mechanism 1 to operate synchronously, and the first driving device 10 drives the baffle 9 to approach the second push plate 8, driving the second push plate 8 to move toward the flange 25, thereby pressing the bottom of the valve 3 against the flange 25, completing the pre-tightening process of the valve 3. Compared with the traditional technology, this technical solution replaces The multi-link rigid connection of the traditional pre-tightening mechanism is replaced by the multi-link rigid connection of the traditional pre-tightening mechanism, and the pre-tightening process of the valve 3 is divided into two processes: alignment with the flange 25 and pressing with the flange 25. The alignment of the valve 3 and the flange 25 is achieved through the two processes of coarse adjustment and fine adjustment, which ensures the alignment accuracy between the valve 3 and the flange 25. The first pre-tightening mechanism 1 and the second pre-tightening mechanism 2 are respectively pressed together with the upper and lower parts of the valve 3 to ensure the tightness between the valve 3 and the flange 25, so that the pre-tightening force of the vacuum valve 3 meets the requirements. In addition, whether it is the first pre-tightening mechanism 1 or the second pre-tightening mechanism 2, the processing accuracy and installation accuracy requirements of the structural components therein are not high. Compared with the connecting rod structure, the processing cost and installation difficulty of the pre-tightening mechanism are effectively reduced.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. In other words, any equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the technical scope of the present invention.

Claims

1. A pre-tightening device for a large valve, comprising a first pre-tightening mechanism (1) and a second pre-tightening mechanism (2) mounted on a valve (3), characterized in that: The first pre-tightening mechanism (1) is located at the top of the valve (3), and the second pre-tightening mechanism (2) is located at the bottom of the valve (3); The first pre-tightening mechanism (1) includes a crossbeam (4), a walking mechanism (5), a sliding mechanism (6) and a first push plate (7), the crossbeam (4) is arranged on the top of the valve (3) and is perpendicular to the valve (3), the walking mechanism (5) is fixedly arranged at both ends of the crossbeam (4), the sliding mechanism (6) is slidably connected to the crossbeam (4), the first push plate (7) is fixedly connected to the valve (3), and the sliding mechanism (6) drives the first push plate (7) to move so as to press the valve (3) and the flange (25); The second pre-tightening mechanism (2) comprises a second push plate (8), a baffle (9) and a first driving device (10). The second push plate (8) is fixedly connected to the valve (3). The baffle (9) is arranged on both sides of the second push plate (8) in a direction perpendicular to the valve (3). The first driving device (10) drives the baffle (9) to move closer to or away from the second push plate (8).

2. The pre-tightening device for large valves according to claim 1, characterized in that: The sliding mechanism (6) includes a second driving device (11) and a support frame (12). First sliders (13) are provided at both ends of the support frame (12). Sliding grooves (14) for accommodating the first sliders (13) are provided on both sides of the crossbeam (4). When the second driving device (11) drives the support frame (12) to move, the first slider (13) slides along the sliding grooves (14).

3. The pre-tightening device for large valves according to claim 2, characterized in that: A first roller (15) is mounted on the first slider (13). When the first slider (13) slides in the sliding groove (14), the first roller (15) contacts the sliding groove (14) and rolls relative to the sliding groove (14).

4. The pre-tightening device for large valves according to claim 1, characterized in that: A second slider (16) is fixedly connected to the bottom of the second push plate (8), and a second roller (17) is mounted on the second slider (16). When the baffle (9) approaches the second push plate (8), the second roller (17) contacts the baffle (9) and rolls relative to the baffle (9).

5. The pre-tightening device for large valves according to claim 2, characterized in that: A multi-joint connection mechanism (18) is provided between the first push plate (7) and the support frame (12), one end of the multi-joint connection mechanism (18) is fixedly connected to the first push plate (7), and the other end of the multi-joint connection mechanism (18) is rotatably connected to the support frame (12).

6. The pre-tightening device for large valves according to claim 5, characterized in that: The multi-joint connection mechanism (18) includes a first joint (19), a second joint (20), and a joint arm (21) located between the first joint (19) and the second joint (20), wherein the joint arm (21) is rotationally connected to the first joint (19) and the second joint (20), respectively. The first joint (19) is rotationally connected to the support frame (12) via a first pin (22), the first joint (19) is rotationally connected to the joint arm (21) via a second pin (23), the second joint (20) is rotationally connected to the joint arm (21) via a third pin (24), and the second joint (20) is fixedly connected to the first push plate (7).

7. The pre-tightening device for large valves according to claim 6, characterized in that: The axis of the first pin (22) is perpendicular to the valve (3), the axis of the second pin (23) is parallel to the valve (3), and the axis of the third pin (24) is parallel to the valve (3).

8. The pre-tightening device for large valves according to claim 2, characterized in that: At least two crossbeams (4) are provided, and the crossbeams (4) are parallel to each other, and each baffle (9) is equipped with at least two first drive devices (10).

9. The pre-tightening device for large valves according to claim 8, characterized in that: At least two second drive devices (11) are provided, and each crossbeam (4) corresponds to one second drive device (11). At least four first sliders (13) are provided, and a first slider (13) is installed on both sides of each crossbeam (4).

10. The pre-tightening device for large valves according to claim 5, characterized in that: At least two first push plates (7) are provided, and the first push plates (7) are respectively provided at both ends of the support frame (12), and each end of the support frame (12) is installed with a multi-joint connection mechanism (18).

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