Clamping and sealing device for off-line verification of safety valve

Abstract

The invention discloses a clamping and sealing device for off-line verification of a safety valve, and relates to the technical field of safety valve verification, the device comprises a bottom plate, a frame body and a verification mechanism, the frame body and the verification mechanism are both arranged on the bottom plate, the verification mechanism comprises a mechanical clamping mechanism and a sealing mechanism, a flexible cushion block is arranged on the frame body, and a first through hole is formed in the flexible cushion block; the mechanical clamping mechanism is used for clamping the safety valve; after the safety valve is clamped by the mechanical clamping mechanism, the sealing mechanism enables the flexible cushion block to seal the outer periphery of the air inlet of the safety valve and enables the first through hole to be communicated with the air inlet of the safety valve. The sealing mechanism and the mechanical clamping mechanism are installed on the bottom plate, and the mechanical clamping mechanism can be matched with safety valves of different sizes within a certain size range; the mechanical clamping mechanism adopts mechanical clamping, on one hand, the clamping force can be conveniently adjusted, and on the other hand, safety accidents are not prone to occurring; the sealing mechanism can enable the flexible cushion block to completely seal the edge of the air inlet of the safety valve, so that the safety valve can work normally in the verification process.

Description

Technical Field

[0001] The invention relates to the technical field of safety valve calibration, and in particular to a clamping and sealing device for off-line calibration of a safety valve. Background Art

[0002] As a key pressure relief protection device for pressure-bearing special equipment, safety valves are widely used in modern industry. In order to ensure the safe operation of pressure vessels, protect people's lives and property, and promote the development of the national economy, according to the "Safety Technical Supervision Regulations for Safety Valves", safety valve accessories should implement a regular inspection system. Safety valves must be calibrated at least once a year, that is, to inspect the sealing performance of the safety valve under its working pressure and the pressure relief performance under overpressure.

[0003] At present, the safety valve calibration technology mainly includes two categories: offline calibration and online calibration. For offline calibration, the calibration process is: first use a clamp to clamp the safety valve, and then test the sealing of the safety valve. The clamping mechanism of the offline calibration device currently used generally uses nitrogen or compressed air as a pressure source to clamp and fix the safety valve. However, this clamping method has the following disadvantages: due to the rapid diffusion speed of the gas and the large impact force, injury accidents are prone to occur; at the same time, the sealing performance of this clamping method is poor, which will affect the subsequent calibration results of the safety valve sealing performance. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a clamping sealing device for off-line verification of a safety valve.

[0005] The objective of the present invention is achieved through the following technical solutions: A clamping and sealing device for offline verification of a safety valve comprises a base plate, a frame body and a verification mechanism all arranged on the base plate, the verification mechanism comprising a mechanical clamping mechanism and a sealing mechanism, a flexible pad block is arranged on the frame body, a first through hole is opened on the flexible pad block; the mechanical clamping mechanism is used to clamp the safety valve; after the safety valve is clamped by the mechanical clamping mechanism, the sealing mechanism enables the flexible pad block to seal the outer periphery of the air inlet of the safety valve, and enables the first through hole to communicate with the air inlet of the safety valve.

[0006] Furthermore, in the present invention, the mechanical clamping mechanism comprises a base transmission-connected to the sealing mechanism and a driving mechanism arranged on the base, the driving mechanism transmission-connected to two sliders, the driving mechanism is used to drive the two sliders to move closer to or away from each other; a clamping block is arranged on any of the sliders; after the safety valve is clamped by the two clamping blocks, the sealing mechanism moves the safety valve toward the flexible pad until the flexible pad seals the outer periphery of the air inlet of the safety valve.

[0007] Furthermore, in the present invention, the driving mechanism is a screw-nut mechanism, and two threaded portions are arranged on the screw of the driving mechanism at intervals, and the rotation directions of the two threaded portions are opposite, and the two sliders are respectively threadedly connected to the two threaded portions.

[0008] Furthermore, in the present invention, the sealing mechanism includes a screw lifter arranged on the base plate and a guide rod rotatably arranged on the base plate, the execution end of the screw lifter and one end of the guide rod are both transmission-connected to the base, and the lifting direction of the screw lifter and the central axis of the guide rod are both parallel to the central axis of the first through hole.

[0009] Furthermore, in the present invention, the flexible pad is located between the two clamping blocks, and the two clamping blocks are symmetrically arranged with respect to the central axis of the first through hole.

[0010] Furthermore, in the present invention, any of the above-mentioned sliders is slidably connected to the above-mentioned base, and the sliding direction of any of the above-mentioned sliders is parallel to the central axis of the screw rod of the above-mentioned driving mechanism.

[0011] Furthermore, in the present invention, a flexible clamping sheet is provided on a side of any of the clamping blocks close to another of the clamping blocks.

[0012] Furthermore, in the present invention, a second through hole for installing the flexible pad is provided on the frame; when the flexible pad is installed in the second through hole, the first through hole is communicated with the second through hole.

[0013] The beneficial effects of the present invention are: The present invention provides a clamping and sealing device for off-line verification of a safety valve. By installing a mechanical clamping mechanism and a sealing mechanism on a bottom plate, the mechanical clamping mechanism can be adapted to safety valves of different sizes within a certain size range; the mechanical clamping mechanism adopts mechanical clamping, which is convenient for adjusting the clamping force on the one hand, and is not prone to safety accidents on the other hand; the sealing mechanism can enable the flexible pad to completely seal the outer periphery of the air inlet of the safety valve, thereby ensuring the sealing performance of the safety valve during the verification process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of an embodiment of the present invention; Figure 2 for Figure 1 Exploded view of.

[0015] In the figure: 101-bottom plate; 201-frame; 301-mechanical clamping mechanism; 3011-base; 3012-driving mechanism; 3013-slider; 3014-clamping block; 401-sealing mechanism; 4011-screw lift; 4012-guide rod; 501-flexible pad; 601-safety valve; 701-flexible clamping plate. DETAILED DESCRIPTION

[0016] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0017] See also Figure 1 and Figure 2 , the present invention provides a technical solution: A clamping and sealing device for offline verification of a safety valve comprises a base plate 101, a frame 201 fixedly mounted on the base plate 101, and a verification mechanism, wherein the verification mechanism comprises a mechanical clamping mechanism 301 and a sealing mechanism 401. A flexible pad 501 is mounted on the frame 201. In this embodiment, the flexible pad 501 is a cylindrical structure. A first through hole (not marked in the figure) is provided on the flexible pad 501, and the central axis of the first through hole is parallel to the vertical direction. The mechanical clamping mechanism 301 is used to clamp the safety valve 601. After the safety valve 601 is clamped by the mechanical clamping mechanism 301, the sealing mechanism 401 enables the flexible pad 501 to seal the outer periphery of the air inlet of the safety valve 601, and enables the first through hole to communicate with the air inlet of the safety valve 601.

[0018] Preferably, the mechanical clamping mechanism 301 in this embodiment comprises a base 3011 drivingly connected to the sealing mechanism 401 and a driving mechanism 3012 mounted on the base 3011. In this embodiment, the driving mechanism 3012 is a screw-nut mechanism. Two threaded parts are arranged on the screw of the driving mechanism 3012 at intervals, and the two threaded parts rotate in opposite directions. The two threaded parts are threadedly connected with sliders 3013, and any slider 3013 is slidably connected to the base 3011. The sliding direction of any slider 3013 is parallel to the central axis of the screw of the driving mechanism 3012. In this way, when the screw of the driving mechanism 3012 rotates, the two sliders 3013 can approach or move away from each other.

[0019] In this embodiment, the forward and reverse rotation of the screw of the driving mechanism 3012 can be controlled by a worm gear mechanism, which has the characteristics of good compactness, large transmission ratio and self-locking ability. When the safety valve 601 is clamped, it prevents the screw from rotating and causing relative displacement of the two sliders 3013.

[0020] In this embodiment, a clamping block 3014 is installed on any slider 3013. Any clamping block 3014 is a rectangular parallelepiped structure. A flexible clamping sheet 701 is installed on one side of any clamping block 3014 close to another clamping block 3014. The flexible clamping sheet 701 can be fixed to the clamping block 3014 by screws. In this embodiment, the frame 201 is a U-shaped structure, and its two ends are fixedly connected to the bottom plate 101. After installation, it is located between the two sliders 3013, that is, the flexible pad 501 is located between the two clamping blocks 3014. The installation position of the flexible pad 501 needs to make the two clamping blocks 3014 symmetrically arranged about the central axis of the flexible pad 501, so that the distances from the two sliders 3013 to the flexible pad 501 are the same.

[0021] In order to facilitate the installation of the flexible pad 501 , in this embodiment, a second through hole (not marked in the figure) for installing the flexible pad 501 is further provided on the frame body 201 .

[0022] Preferably, the sealing mechanism 401 in this embodiment includes a screw lift 4011 installed on the bottom plate 101 and two guide rods 4012 rotatably arranged on the bottom plate 101, the execution end of the screw lift 4011 and one end of the two guide rods 4012 are both transmission-connected with the base 3011, and the lifting direction of the screw lift 4011 and the central axis of the two guide rods 4012 are both parallel to the vertical direction. The two guide rods 4012 are both rotationally connected with the bottom plate 101 through linear bearings. The screw lift 4011 is a prior art, so its working principle will not be described in detail here.

[0023] from Figure 1 or Figure 2 From the perspective of FIG. 5 , when the safety valve 601 is clamped by the mechanical clamping mechanism 301, the air inlet of the safety valve 601 (which is located at the bottom end of the safety valve 601) has not yet contacted the flexible pad 501. Then the screw lift 4011 is started, and the base 3011 moves downward under the control of the screw lift 4011, and the entire mechanical clamping mechanism 301 moves downward synchronously. After the air inlet of the safety valve 601 abuts against the flexible pad 501, it continues to move downward for a certain distance, so that the flexible pad 501 completely seals the edge of the air inlet of the safety valve 601, ensuring that the safety valve 601 can work normally during the verification process (ensuring that the gas entering the safety valve 601 through the second through hole, the first through hole and the air inlet of the safety valve 601 in sequence will not escape outward from the abutment between the air inlet of the safety valve 601 and the flexible pad 501), and then the gas enters the air inlet of the safety valve 601 through the second through hole and the first through hole on the flexible pad 501 in sequence to perform offline verification.

[0024] The above are only the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the concept described herein through the above teachings or the technology or knowledge in related fields. Any changes and variations made by those skilled in the art without departing from the spirit and scope of the present invention shall fall within the protection scope of the appended claims of the present invention.

Claims

1. A clamping and sealing device for off-line calibration of a safety valve, characterized in that: The invention comprises a bottom plate (101), a frame (201) and a verification mechanism, both of which are arranged on the bottom plate (101); the verification mechanism comprises a mechanical clamping mechanism (301) and a sealing mechanism (401); a flexible pad (501) is arranged on the frame (201), and a first through hole is opened on the flexible pad (501); the mechanical clamping mechanism (301) is used to clamp a safety valve (601); after the safety valve (601) is clamped by the mechanical clamping mechanism (301), the sealing mechanism (401) enables the flexible pad (501) to seal the outer periphery of the air inlet of the safety valve (601), and enables the first through hole to communicate with the air inlet of the safety valve (601).

2. The clamping and sealing device for off-line calibration of a safety valve according to claim 1, characterized in that: The mechanical clamping mechanism (301) comprises a base (3011) drivingly connected to the sealing mechanism (401) and a driving mechanism (3012) arranged on the base (3011); the driving mechanism (3012) is drivingly connected to two sliders (3013); the driving mechanism (3012) is used to drive the two sliders (3013) to move closer to or farther away from each other; a clamping block (3014) is arranged on any of the sliders (3013); after the safety valve (601) is clamped by the two clamping blocks (3014), the sealing mechanism (401) causes the safety valve (601) to move toward the flexible pad (501) until the flexible pad (501) seals the outer periphery of the air inlet of the safety valve (601).

3. A clamping and sealing device for off-line calibration of a safety valve according to claim 2, characterized in that: The driving mechanism (3012) is a screw-nut mechanism, and two threaded portions are arranged at intervals on the screw of the driving mechanism (3012), and the rotation directions of the two threaded portions are opposite, and the two sliders (3013) are respectively threadedly connected to the two threaded portions.

4. A clamping and sealing device for off-line calibration of a safety valve according to claim 2 or 3, characterized in that: The sealing mechanism (401) comprises a screw lift (4011) arranged on the base plate (101) and a guide rod (4012) rotatably arranged on the base plate (101); the execution end of the screw lift (4011) and one end of the guide rod (4012) are both transmission-connected to the base (3011); the lifting direction of the screw lift (4011) and the central axis of the guide rod (4012) are both parallel to the central axis of the first through hole.

5. A clamping and sealing device for off-line calibration of a safety valve according to claim 4, characterized in that: The flexible pad (501) is located between the two clamping blocks (3014), and the two clamping blocks (3014) are symmetrically arranged with respect to the central axis of the first through hole.

6. A clamping and sealing device for off-line calibration of a safety valve according to claim 3, characterized in that: Any of the sliders (3013) is slidably connected to the base (3011), and the sliding direction of any of the sliders (3013) is parallel to the central axis of the screw rod of the driving mechanism (3012).

7. A clamping and sealing device for off-line calibration of a safety valve according to claim 2, characterized in that: A flexible clamping sheet (701) is provided on one side of any clamping block (3014) close to another clamping block (3014).

8. A clamping and sealing device for off-line calibration of a safety valve according to claim 5, characterized in that: The frame (201) is provided with a second through hole for installing the flexible pad (501); when the flexible pad (501) is installed in the second through hole, the first through hole is connected to the second through hole.

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