CN210293669U - Clamping device - Google Patents

Abstract

The utility model provides a clamping device, which is characterized in that a clamping platform, a hydraulic cylinder and a liquid supply device of the clamping device are arranged into a split structure, and during the checking, at least parts of the clamping platform and the hydraulic cylinder are placed in a pit arranged on the ground, and the liquid supply device is arranged on the ground, so that the distance between the table surface of the clamping platform for fixing the safety valve and the ground is effectively reduced, the distance between a safety nut at the top end of the safety valve and the ground is further reduced, so that the operator can more conveniently operate the safety nut at the top end of the safety valve in the checking process, so as to realize the quick adjustment of the opening pressure value of the safety valve, improve the checking efficiency of the safety valve, and the condition that the spanner slips off and the like when the safety nut is adjusted by an operator due to overhigh safety nut is avoided, so that the personal safety in the checking process is ensured.

Description

Clamping device

Technical Field

The utility model relates to a relief valve test equipment technical field especially relates to a clamping device.

Background

The safety valve is an important safety accessory of pressure-bearing equipment such as boilers, pressure vessels, pressure pipelines and the like, and the action reliability and the sealing performance of the safety valve are the keys for ensuring the safety of the equipment and operators, so the opening pressure value and the sealing performance of the safety valve need to be verified before the safety valve is used. In the verification process, the safety valve needs to be stably fixed so as to ensure smooth verification.

In the prior art, a safety valve clamping device driven by hydraulic pressure comprises a clamping table and a hydraulic driving mechanism arranged below the clamping table. During the check-up, the one end of relief valve is fixed on pressing from both sides tight platform, and at the check-up in-process, the operator need adjust the safety nut on the top of relief valve moreover to the realization is to the regulation of relief valve opening pressure value.

However, the clamping table and the hydraulic driving mechanism of the safety valve checking and clamping device are of an integrated structure, the table surface of the clamping table is usually 0.6-0.8 mm away from the ground, and the height of a large-sized safety valve is usually about 2m, which causes inconvenience in the operation of an operator on a safety nut at the top end of the safety valve, thereby affecting the checking efficiency.

SUMMERY OF THE UTILITY MODEL

The utility model provides a clamping device to after solving among the prior art relief valve clamping device and pressing from both sides tight relief valve, the safety nut that can lead to the relief valve top is higher apart from ground, and makes operating personnel comparatively inconvenient to safety nut's operation, thereby influences the problem of check-up efficiency.

The utility model provides a clamping device, which is used for clamping a safety valve in the checking process, and comprises a clamping table, a hydraulic cylinder and a liquid supply device;

the clamping table is used for fixing the safety valve;

the piston of the hydraulic cylinder is connected with the clamping table and used for enabling the clamping table to selectively clamp or release the safety valve in the reciprocating motion of the piston; the liquid supply device is communicated with a cylinder sleeve of the hydraulic cylinder through a liquid conveying pipe so as to drive the piston to reciprocate in the cylinder sleeve;

the liquid supply device is arranged on the ground, at least parts of the clamping table and the hydraulic cylinder are accommodated in a pit formed in the ground, and at least a clamping surface of the clamping table is positioned outside the pit.

Optionally, the clamping table comprises a support disc, a clamping disc and at least two clamping jaws;

the clamping disc is positioned on one side of the supporting disc, and at least two clamping claws are respectively arranged on two sides of the central axis of the clamping disc in a sliding manner; a bulge is arranged on the side wall of each clamping jaw, which faces to the central axis of the clamping disc, and an inlet flange of the safety valve is positioned in a clamping space defined by the clamping disc and the bulge;

the hydraulic cylinder is positioned on one side, away from the clamping disc, of the supporting disc, and the piston penetrates through the supporting disc to be connected with the clamping disc, so that the inlet flange is clamped in the clamping space or released from the clamping space under the driving of the piston.

Optionally, the surface of the support disc facing the clamping disc forms a sliding groove, and the sliding groove extends along the radial direction of the support disc;

and a sliding block matched with the sliding groove is formed at one end of the clamping claw, and the clamping claw is arranged in the sliding groove in a sliding manner through the sliding block.

Optionally, the number of the clamping claws is 3, and three clamping claws are uniformly distributed along the circumferential direction of the supporting disc.

Optionally, the clamping table further comprises a support column;

the piston comprises a piston disc positioned in the cylinder sleeve and a piston rod with one end connected to the piston disc; one end of the supporting column is connected with the piston rod, and the other end of the supporting column penetrates through the supporting disc to be connected with the clamping disc.

Optionally, a first channel is formed on the supporting column along the axis direction, and a second channel is formed on the clamping disc along the thickness direction;

one end of the first channel extends to the outside of the supporting column, the other end of the first channel is communicated with the second channel, and the second channel is communicated with the inner cavity of the safety valve through a through hole in the inlet flange, so that the high-pressure gas for verification enters the inner cavity of the safety valve through the first channel and the second channel.

Optionally, a first annular groove is formed in an end face, facing the clamping disc, of the support column, a first sealing ring is arranged in the first annular groove, and the support column is connected with the clamping disc in a sealing mode through the first sealing ring.

Optionally, a second annular groove is formed in a surface, facing the inlet flange, of the clamping disc, a second sealing ring is arranged in the second annular groove, and the clamping disc is connected with the inlet flange in a sealing mode through the second sealing ring.

Optionally, the liquid supply device comprises a liquid storage device, a driving device, a first valve and a second valve; the infusion tube comprises a first infusion tube and a second infusion tube;

the inlet end of the driving device is communicated with the outlet end of the liquid storage device, the outlet end of the driving device is respectively communicated with the first infusion tube and the second infusion tube, and the first valve and the second valve are respectively arranged on the first infusion tube and the second infusion tube;

the cylinder sleeve of the hydraulic cylinder is divided into an upper cavity and a lower cavity by the piston, and the first infusion tube and the second infusion tube are respectively communicated with the upper cavity and the lower cavity.

Optionally, the drive means comprises a motor and a delivery pump;

the motor is connected with the delivery pump through a motor output shaft; the inlet end of the delivery pump is communicated with the outlet end of the liquid storage device, and the outlet end of the delivery pump is respectively communicated with the first infusion tube and the second infusion tube;

the first valve and the second valve are both solenoid valves.

The utility model provides a clamping device, which is used for clamping a safety valve in the checking process and comprises a clamping table, a hydraulic cylinder and a liquid supply device; the clamping table is used for fixing the safety valve; the piston of the hydraulic cylinder is connected with the clamping table and used for enabling the clamping table to selectively clamp or release the safety valve in the reciprocating motion of the piston; the liquid supply device is communicated with the cylinder sleeve of the hydraulic cylinder through a liquid conveying pipe so as to drive the piston to reciprocate in the cylinder sleeve; the liquid supply device is arranged on the ground, at least parts of the clamping table and the hydraulic cylinder are used for being accommodated in a pit formed in the ground, and at least a clamping surface of the clamping table is positioned outside the pit. The utility model discloses a set up clamping device's clamping bench and pneumatic cylinder and liquid supply device into split type structure, and when the check-up, place the at least part of clamping bench and pneumatic cylinder in the pit of subaerial seting up, will supply liquid device to set up subaerial, the effectual mesa that is used for the clamping bench of fixed relief valve that has reduced and the distance between the ground, the distance between the safety nut on relief valve top and the ground has further been reduced, make operating personnel at the check-up in-process, the safety nut on operation relief valve top that can be more convenient, with the realization to the quick adjustment of the pressure value of opening of relief valve, the check-up efficiency to the relief valve has been improved, and avoided safety nut too high and lead to operating personnel to appear the emergence of the condition such as spanner landing when adjusting safety nut, thereby the personal safety of check-up in-process.

The structure of the present invention and other objects and advantages thereof will be more clearly understood from the following description of the preferred embodiments taken in conjunction with the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic structural diagram of a clamping device according to an embodiment of the present invention;

fig. 2 is a schematic view of an assembly structure of the clamping device and the safety valve according to an embodiment of the present invention;

FIG. 3 is a schematic view showing an assembled structure of the clamping table and the hydraulic cylinder in FIG. 2;

FIG. 4 is a schematic structural view of the support tray of FIG. 3;

FIG. 5 is a front view of the support post of FIG. 3;

FIG. 6 is a top view of the support post of FIG. 3;

fig. 7 is a schematic view of the structure of the clamping disk of fig. 3.

Description of reference numerals:

100-a clamping table;

110-a support disk;

111-a chute;

112-mounting holes;

120-a clamping disk;

121-a second channel;

122-a seal groove;

123-a second sealing ring;

130-a clamping jaw;

131-a projection;

132-a slider;

140-a clamping space;

150-support column;

151-first channel;

152-a first seal ring;

153-a first annular groove;

160-a protective cover;

200-hydraulic cylinder;

210-cylinder liner;

220-a piston rod;

211 — a first via;

212-a second via;

300-a liquid supply device;

310-a reservoir;

320-a motor;

330-a delivery pump;

340-a first valve;

350-a second valve;

400-an infusion tube;

410-a first infusion tube;

420-a second infusion tube;

500-safety valve;

510-a safety nut;

520-an inlet flange;

600-ground;

610-pit.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description of the present invention, it is to be understood that the terms "inner", "outer", "upper", "bottom", "front", "rear", and the like, when used in the orientation or positional relationship indicated in the drawings, are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Fig. 1 is a schematic structural view of a clamping device provided in the present embodiment; fig. 2 is a schematic view of an assembly structure of the clamping device and the safety valve provided in this embodiment. Referring to fig. 1 and 2, the present embodiment provides a clamping device for clamping a safety valve 500 during a verification process. The clamping apparatus of the present embodiment includes a clamping table 100, a hydraulic cylinder 200, and a liquid supply apparatus 300. Wherein the clamping table 100 is used for fixing the safety valve 500, and the piston 220 of the hydraulic cylinder 200 is connected with the clamping table 100 for enabling the clamping table 100 to selectively clamp or release the safety valve 500 in the reciprocating motion of the piston 220. The liquid supply device 300 is communicated with the cylinder sleeve 210 of the hydraulic cylinder 200 through a liquid conveying pipe 400 to drive the piston 220 to reciprocate in the cylinder sleeve 210. It is understood that, in the present embodiment, the liquid supply device 300 supplies or extracts liquid into the cylinder casing 210, so as to move the piston 220 up and down in a direction close to the clamping table 100 or away from the clamping table 100, so as to clamp the clamping table 100 or release the safety valve 500.

Referring to fig. 1, in the present embodiment, the liquid supply device 300 is communicated with the cylinder sleeve 210 of the hydraulic cylinder 200 through the liquid delivery pipe 400, so that the liquid supply device 300 is separately arranged with the clamping table 100 and the hydraulic cylinder 200, and thus, during the calibration process, the clamping table 100 and the hydraulic cylinder 200 located below the clamping table 100 can be located at different positions from the liquid supply device 300. Meanwhile, the liquid supply device 300, the clamping table 100 and the hydraulic cylinder 200 are arranged in a split structure, so that the liquid supply device 300, the clamping table 100 and the hydraulic cylinder 200 are more convenient to carry and detach, and the operation, the maintenance and the like of each part are facilitated.

Referring to fig. 2, in order to reduce the distance between the clamping surface of the clamping table 100 and the floor surface 600, in the clamping device of the present embodiment, when the liquid supply device 300 is installed, at least a part of the clamping table 100 and the hydraulic cylinder 200 is accommodated in a recess 610 formed in the floor surface 600, and at least the clamping surface of the clamping table 100 is positioned outside the recess 610 to clamp the safety valve 500 on the clamping surface of the clamping table 100, and the liquid transfer tube 400 connected to the hydraulic cylinder 200 is drawn out from the opening of the recess 610 and communicated with the liquid supply device 300.

Specifically, in the embodiment, the clamping table 100, the hydraulic cylinder 200 and the liquid supply device 300 of the clamping device are designed to be a split structure, and at least part of the clamping table 100 and the hydraulic cylinder 200 is placed in the pit 610 formed in the ground 600 during verification, and the liquid supply device 300 is arranged on the ground 600, so that the distance between the table surface of the clamping table 100 for fixing the safety valve 500 and the ground 600 is effectively reduced, and the distance between the safety nut 510 at the top end of the safety valve 500 and the ground 600 is further reduced, so that an operator can more conveniently operate the safety nut 510 at the top end of the safety valve 500 during verification, so as to realize rapid adjustment of the opening pressure value of the safety valve 500, improve the verification efficiency of the safety valve 500, and avoid the occurrence of situations such as falling of a wrench when the operator adjusts the safety nut 510 due to overhigh safety nut 510, thereby ensuring the personal safety in the checking process.

In this example, the length, width and depth dimensions of the dimple 610 are 1000mm, respectively. It will be appreciated that the specific dimensions of the length, width and depth of the recess 610 provided in the ground 600 may be determined according to the dimensions of the clamping table 100 and the hydraulic cylinder 200. Taking the example where the portions below the clamping surface of the clamping table 100 are both located within the pocket 610, the cross-sectional dimension of the pocket 610 may be slightly larger than the maximum cross-sectional dimension of the portion below the clamping surface of the clamping table 100 to facilitate placement of the portion below the clamping surface of the clamping table 100 and the hydraulic cylinder 200 into the pocket 610 or removal of the portion below the clamping surface of the clamping table 100 and the hydraulic cylinder 200 from the pocket 610.

In order to enhance the structural strength of the pit 610, the inner wall of the pit 610 of the present embodiment is integrally cast with concrete. And be provided with additional strengthening in the opening a week of pit 610 to improve the opening intensity of pit 610, avoid collapsing, thereby guarantee the normal clear of verification process. In addition, a fixing bolt is provided at an inner bottom wall of the recess 610 for stably fixing the bottom of the hydraulic cylinder 200 in the recess 610.

Fig. 3 is a schematic view showing an assembly structure of the clamping table and the hydraulic cylinder in fig. 2. Referring to fig. 2 and 3, the clamping stage 100 of the present embodiment includes a support plate 110, a clamping plate 120, and at least two clamping jaws 130. Wherein, the clamping disk 120 is located at one side of the supporting disk 110, and at least two clamping claws 130 are respectively slidably arranged at two sides of the central axis of the clamping disk 120; a convex portion 131 is provided on a side wall of each clamping jaw 130 facing the central axis of the clamping disk 120, and an inlet flange 520 of the relief valve 500 is located in the clamping space 140 enclosed by the clamping disk 120 and the convex portion 131. The hydraulic cylinder 200 is located on the side of the support plate 110 facing away from the clamping plate 120, and the piston 220 of the hydraulic cylinder 200 passes through the support plate 110 and is connected with the clamping plate 120, so that the inlet flange 520 is clamped in the clamping space 140 or released from the clamping space 140 under the driving of the piston 220.

Specifically, referring to fig. 2 and 3, before verifying the safety valve 500, the inlet flange 520 of the safety valve 500 is abutted against the upper surface of the clamping disk 120, then the clamping jaw 130 is slid over the inlet flange 510 of the safety valve 500, the liquid supply device 300 drives the piston 220 of the hydraulic cylinder 200 to move toward the support disk 110, the piston 220 drives the clamping disk 120 and the inlet flange 520 of the safety valve 500 to move upward toward the protrusion 131 close to the clamping jaw 130 until the upper surface of the inlet flange 520 abuts against the protrusion 131, and the inlet flange 520 of the safety valve 500 is stably clamped between the clamping disk 120 and the protrusion 131.

After the verification is completed, the liquid supply device 300 drives the piston 220 of the hydraulic cylinder 200 to move downward in a direction away from the support plate 110, and the piston 220 drives the clamping plate 120 and the inlet flange 520 of the safety valve 500 to move downward in a direction away from the protrusion 131 of the clamping claw 130, so that the upper surface of the inlet flange 520 is separated from the protrusion 131, and the release of the inlet flange 520 is completed. The piston 220 then continues to move the clamping disk 120 and the inlet flange 520 downward until the clamping disk 120 contacts the support disk 110, and then the clamping jaws 130 are moved in a direction away from the clamping disk 120, and the safety valve 500 is removed, and the safety valve 500 is completely disassembled.

It is understood that the shape of the protrusion 131 of the clamping jaw 130 can be various, and is not limited herein, as long as the protrusion 131 can be ensured to abut against the inlet flange 520. Preferably, the surface of the protrusion 131 facing the inlet flange 520 is formed as a flat surface coinciding with the upper surface of the inlet flange 520 to increase the contact area of the protrusion 131 with the surface of the inlet flange 520, thereby making the contact between the protrusion 131 and the inlet flange 520 tighter.

Fig. 4 is a schematic structural view of the support plate 110 in fig. 3. Referring to fig. 3 and 4, in order to facilitate the movement of the clamping jaw 130, the present embodiment may form a slide groove 111 on a surface of the support plate 110 facing the clamping plate 110, and the slide groove extends in a radial direction of the support plate 110. One end of the clamping claw 130 is formed with a sliding block 132 matched with the sliding slot 111, and the clamping claw 130 is slidably arranged in the sliding slot 111 through the sliding block 132. The present embodiment slides in the sliding groove 111 through the sliding block 132, so that the movement of the clamping claw 130 on the supporting plate 110 is smoother, thereby improving the fixing efficiency of the safety valve 500. The sliding groove 111 may be an inverted T-shaped structure, and the sliding block 132 of the clamping jaw 130 is a T-shaped structure matching the inverted T-shaped structure.

As shown in fig. 3 and 4, the number of the clamping claws 130 of the present embodiment is 3, and the 3 clamping claws 130 are uniformly distributed along the circumferential direction of the support plate 110. Correspondingly, the number of the sliding grooves 111 on the supporting plate 110 is also 3, and the 3 sliding grooves 111 are uniformly distributed along the circumferential direction of the supporting plate 110, it can be understood that, in the 3 sliding grooves 111 which are uniformly distributed, the included angle between two adjacent sliding grooves 111 is 120 °, and the included angle between the 3 clamping claws 130 which are uniformly distributed is 120 °. The arrangement mode not only improves the fixing stability of the clamping jaws 130 to the inlet flange 520 of the safety valve 500, but also reduces the number of the clamping jaws 130, and saves the cost.

With continued reference to fig. 3, the clamping station 100 of the present embodiment further includes a support post 150. The piston 220 includes a piston disc (not shown) located within the cylinder casing 210 and a piston rod 220 connected at one end to the piston disc. One end of the supporting column 150 is connected to the piston rod 220, and the other end of the supporting column 150 passes through the supporting plate 110 and is connected to the clamping plate 120.

Referring to fig. 3 and 4, in the present embodiment, in particular, a mounting hole 112 is formed in the thickness direction of the support plate 110, and one end of the support column 150 passes through the mounting hole 112 to be connected to the clamping plate 120. The support post 150 makes the connection between the piston rod 220 and the clamping disk 120 more stable, thereby ensuring that the piston rod 220 can stably support the clamping disk 120 and the safety valve 500 on the clamping disk 120, and making the up-and-down movement process of the clamping disk 120 and the safety valve 500 more stable.

In order to protect the support column 150 and the hydraulic cylinder 200, the clamping device of the present embodiment further includes a protective cover 160, and the support column 150 and the hydraulic cylinder 200 are located in the protective cover 160, so as to prevent the inner wall of the concave pit 610 from damaging the connection column 150 and the hydraulic cylinder 200 during the process of placing the connection column 150 and the hydraulic cylinder 200 in the concave pit 610 formed on the ground 600 or taking the connection column 150 and the hydraulic cylinder 200 out of the concave pit 610.

FIG. 5 is a front view of the support post of FIG. 3; figure 6 is a top view of the support post of figure 3. Referring to fig. 3, 5 and 6, the support column 150 of the present embodiment is formed with a first passage 151 along the axial direction, the clamping disk 120 is formed with a second passage 121 along the thickness direction, and one end of the first passage 151 extends to the outside of the support column 150, as shown in fig. 5. The other end of the first passage 151 communicates with the second passage 121. The inlet flange 520 of the safety valve 500 is formed with a through hole communicating with the inner cavity of the safety valve 500, and the second passage 121 communicates with the inner cavity of the safety valve 500 through the through hole of the inlet flange 520, so that the high-pressure gas for verification enters the inner cavity of the safety valve 500 through the first passage 151 and the second passage 121.

Specifically, after the inlet flange 520 of the safety valve 500 is clamped between the clamping disk 120 and the protrusion 131 of the clamping claw 130, the high-pressure gas enters the first channel 151 through the inlet of the first channel 151 on the side wall of the supporting column 150, and then enters the inner cavity of the safety valve 500 through the second channel 121 and the through hole on the inlet flange 520, the operator adjusts the safety nut 510 to a preset position, and observes whether the gas leaks from the sealing surface of the safety valve 500, i.e., whether the safety valve 500 generates a jump-off phenomenon, and when the safety valve 500 generates a jump-off phenomenon, the operator observes and verifies a value on a pressure gauge on a high-pressure gas delivery pipeline, where the value is a jump-off pressure value when the safety nut 510 of the safety valve 500 is located at the preset position. During the verification process, the operator changes the take-off pressure value of the safety valve 500 by adjusting the safety nut 510.

It is understood that the first channel 151 may be disposed at an axial position of the support column 150, or may be disposed at an off-axial position, which is not limited herein.

The connection between the support column 150 and the clamping disk 120 of the present embodiment may be various. As a first connection method, as shown in fig. 3 and 6, a first annular groove 153 may be formed on an end surface of the support column 150 facing the clamping disk 120, and a first sealing ring 152 may be disposed in the first annular groove 153, so that the support column 150 and the clamping disk 120 are hermetically connected by the first sealing ring 152. The connection is an interference connection, which enables a sealing contact between the support post 150 and the clamping disk 120.

And in particular, the cross-sectional dimension of the clamping disk 120 is matched to the cross-sectional dimension of the inlet flange 520, so that the clamping disk 120, in combination with the protrusions 131 of the clamping jaws 130, achieves a stable clamping of the inlet flange 520. The above-described attachment facilitates replacement of the clamping disk 120 to hold different sized relief valves 500.

Fig. 7 is a schematic view of the structure of the clamping disk of fig. 3. Referring to fig. 7, in order to further prevent the first sealing ring 152 from moving in the horizontal direction, in this embodiment, a sealing groove 122 is provided on a side of the clamping disk 120 facing the supporting column 150, and after the supporting column 150 abuts against the clamping disk 120, at least a portion of the first sealing ring 152 is accommodated in the sealing groove 122, thereby serving to stabilize the first sealing ring 152.

The second connection method of the support column 150 and the clamping disk 120 is as follows: an external thread may be provided at one end of the supporting column 150, and an internal thread groove may be provided at a side of the clamping plate 120 facing the supporting column 150, so that one end of the supporting column 150 is stably connected to the clamping plate 120 through the thread. Meanwhile, in order to ensure the sealing performance of the connection position of the supporting column 150 and the clamping disc 120, a sealing ring can be arranged in the inner thread groove to achieve the sealing effect.

Of course, the supporting column 150 and the clamping disk 120 may be connected in other detachable manners as long as the sealing connection between the supporting column 150 and the clamping disk 120 can be ensured.

With continued reference to fig. 7, the surface of the clamping disk 120 facing the inlet flange 520 of the present embodiment forms a second annular groove, a second sealing ring 123 is disposed in the second annular groove, and the clamping disk 120 and the inlet flange 520 are hermetically connected through the second sealing ring 123.

It can be understood that, due to the self-weight of the relief valve 500, the inlet flange 520 of the relief valve 500 can stably abut against the upper surface of the clamping disk 120, and the second sealing ring 123 can achieve the sealing effect therebetween, so as to effectively prevent the high-pressure gas from leaking therefrom.

The above-mentioned connection between the clamping disk 120 and the inlet flange 520 enables the safety valve 500 to be more rapidly and conveniently assembled in the clamping space 140 of the clamping table 100, thereby improving the fixing efficiency of the safety valve 500 and further improving the verification efficiency.

Referring to fig. 2, the liquid supply device 300 of the present embodiment includes a liquid storage device 310, a driving device, a first valve 340 and a second valve 350; infusion tube 400 includes a first infusion tube 410 and a second infusion tube 420. Wherein, the inlet end of the driving device is communicated with the outlet end of the liquid storage device 400, the outlet end of the driving device is respectively communicated with the first infusion tube 410 and the second infusion tube 420, and the first valve 340 and the second valve 350 are respectively arranged on the first infusion tube 410 and the second infusion tube 420. The liquid in the liquid storage device 310 is hydraulic oil, that is, the piston moves up and down through the hydraulic oil.

The cylinder sleeve 210 of the hydraulic cylinder 200 of the present embodiment is divided into two chambers, an upper chamber and a lower chamber, by a piston, a first through hole 211 communicating with the upper chamber and a second through hole 212 communicating with the lower chamber are formed on a side wall of the cylinder sleeve 210, and a first infusion tube 410 and a second infusion tube 420 are respectively communicated with the two chambers. Specifically, the first infusion tube 410 communicates with the lower chamber through the second through hole 212, and the second infusion tube 420 communicates with the upper chamber through the first through hole 211.

When the safety valve 500 needs to be clamped, the first valve 340 is opened, the second valve 350 is closed, the driving device delivers the liquid in the liquid storage device 310 into the lower chamber of the cylinder liner 210, then the first valve 340 is closed, the second valve 350 is opened, the driving device pumps out the liquid in the upper chamber, so that the piston moves upwards under the pushing of the liquid in the lower chamber, and the inlet flange 520 is pushed until the inlet flange 520 is clamped between the clamping disc 120 and the protruding parts 131 of the clamping jaws 130.

When the relief valve 500 needs to be released, the second valve 350 is opened, the first valve 340 is closed, the driving device conveys the liquid in the liquid storage device 310 into the upper chamber of the cylinder sleeve 210, then the second valve 350 is closed, the first valve 340 is opened, the driving device pumps the liquid in the lower chamber, so that the piston moves downwards under the push of the liquid in the upper chamber, the inlet flange 520 of the relief valve 500 is separated from the bulge 131 of the clamping jaw 130, and the release of the relief valve 500 is completed.

The driving device may include a motor 320 and a delivery pump 330, wherein the motor 320 is connected with the delivery pump 330 through a motor output shaft. The inlet end of the delivery pump 330 communicates with the outlet end of the reservoir 310, and the outlet end of the delivery pump 330 communicates with a first infusion tube 410 and a second infusion tube 420, respectively. The first valve 340 and the second valve 350 are solenoid valves.

It is understood that the motor 320 is a servo motor, and can control the transfer pump 330 to perform forward transfer and reverse extraction for a predetermined time. For example, when the safety valve 500 needs to be clamped, the solenoid valve as the first valve 340 is electrically controlled to be in an open state, and the solenoid valve as the second valve 350 is in a closed state, whereas the motor 320 controls the delivery pump 330 to rotate forward, so that the liquid in the liquid storage device 310 is delivered into the lower chamber through the first liquid delivery pipe 410, and then the solenoid valve as the first valve 340 is electrically controlled to be in a closed state, and the solenoid valve as the second valve 350 is in an open state, whereas the motor 320 controls the delivery pump 330 to rotate backward, so that the liquid in the upper chamber of the cylinder sleeve 210 is reversely pumped into the liquid storage device 310 through the second liquid delivery pipe 420, and the piston is pushed by the liquid in the lower chamber to move upward, so that the inlet flange 520 is pushed until the inlet flange 520 is clamped between the clamping disk 120 and the protruding portion 131 of the clamping jaw 130.

The control process for releasing the safety valve 500 is the reverse process of the clamping safety valve 500, and will not be described herein.

The embodiment provides a clamping device for clamping a safety valve in a checking process, which comprises a clamping table, a hydraulic cylinder and a liquid supply device; the clamping table is used for fixing the safety valve; the piston of the hydraulic cylinder is connected with the clamping table and used for enabling the clamping table to selectively clamp or release the safety valve in the reciprocating motion of the piston; the liquid supply device is communicated with the cylinder sleeve of the hydraulic cylinder through a liquid conveying pipe so as to drive the piston to reciprocate in the cylinder sleeve; the liquid supply device is arranged on the ground, at least parts of the clamping table and the hydraulic cylinder are used for being accommodated in a pit formed in the ground, and at least a clamping surface of the clamping table is positioned outside the pit. The utility model discloses a set up clamping device's clamping bench and pneumatic cylinder and liquid supply device into split type structure, and when the check-up, place the at least part of clamping bench and pneumatic cylinder in the pit of subaerial seting up, will supply liquid device to set up subaerial, the effectual mesa that is used for the clamping bench of fixed relief valve that has reduced and the distance between the ground, the distance between the safety nut on relief valve top and the ground has further been reduced, make operating personnel at the check-up in-process, the safety nut on operation relief valve top that can be more convenient, with the realization to the quick adjustment of the pressure value of opening of relief valve, the check-up efficiency to the relief valve has been improved, and avoided safety nut too high and lead to operating personnel to appear the emergence of the condition such as spanner landing when adjusting safety nut, thereby the personal safety of check-up in-process.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. A clamping device is used for clamping a safety valve in a checking process and is characterized by comprising a clamping table, a hydraulic cylinder and a liquid supply device;

the clamping table is used for fixing the safety valve;

the piston of the hydraulic cylinder is connected with the clamping table and used for enabling the clamping table to selectively clamp or release the safety valve in the reciprocating motion of the piston; the liquid supply device is communicated with a cylinder sleeve of the hydraulic cylinder through a liquid conveying pipe so as to drive the piston to reciprocate in the cylinder sleeve;

the liquid supply device is arranged on the ground, at least parts of the clamping table and the hydraulic cylinder are accommodated in a pit formed in the ground, and at least a clamping surface of the clamping table is positioned outside the pit.

2. The clamping device as claimed in claim 1, wherein the clamping table comprises a support disc, a clamping disc and at least two clamping jaws;

the clamping disc is positioned on one side of the supporting disc, and at least two clamping claws are respectively arranged on two sides of the central axis of the clamping disc in a sliding manner; a bulge is arranged on the side wall of each clamping jaw, which faces to the central axis of the clamping disc, and an inlet flange of the safety valve is positioned in a clamping space defined by the clamping disc and the bulge;

the hydraulic cylinder is positioned on one side, away from the clamping disc, of the supporting disc, and the piston penetrates through the supporting disc to be connected with the clamping disc, so that the inlet flange is clamped in the clamping space or released from the clamping space under the driving of the piston.

3. The clamping device as claimed in claim 2, wherein the surface of the support disc facing the clamping disc forms a sliding groove, and the sliding groove extends in a radial direction of the support disc;

and a sliding block matched with the sliding groove is formed at one end of the clamping claw, and the clamping claw is arranged in the sliding groove in a sliding manner through the sliding block.

4. The clamping device as claimed in claim 2, wherein the number of the clamping jaws is 3, and three clamping jaws are uniformly distributed along the circumference of the support disk.

5. The clamping device as recited in claim 2, wherein said clamping table further comprises a support post;

the piston comprises a piston disc positioned in the cylinder sleeve and a piston rod with one end connected to the piston disc; one end of the supporting column is connected with the piston rod, and the other end of the supporting column penetrates through the supporting disc to be connected with the clamping disc.

6. The clamping device as claimed in claim 5, wherein the support post is formed with a first passage in an axial direction, and the clamping disk is formed with a second passage in a thickness direction;

one end of the first channel extends to the outside of the supporting column, the other end of the first channel is communicated with the second channel, and the second channel is communicated with the inner cavity of the safety valve through a through hole in the inlet flange, so that the high-pressure gas for verification enters the inner cavity of the safety valve through the first channel and the second channel.

7. The clamping device as claimed in claim 5, wherein a first annular groove is formed on an end surface of the supporting column facing the clamping disk, a first sealing ring is arranged in the first annular groove, and the supporting column is connected with the clamping disk in a sealing manner through the first sealing ring.

8. The clamping device as claimed in any one of claims 2 to 7, wherein a surface of the clamping disk facing the inlet flange forms a second annular groove, a second sealing ring being arranged in the second annular groove, and the clamping disk and the inlet flange are sealingly connected by the second sealing ring.

9. The clamping device as claimed in any one of claims 1 to 7, wherein the liquid supply means comprises a liquid storage means, a drive means, a first valve and a second valve; the infusion tube comprises a first infusion tube and a second infusion tube;

the inlet end of the driving device is communicated with the outlet end of the liquid storage device, the outlet end of the driving device is respectively communicated with the first infusion tube and the second infusion tube, and the first valve and the second valve are respectively arranged on the first infusion tube and the second infusion tube;

the cylinder sleeve of the hydraulic cylinder is divided into an upper cavity and a lower cavity by the piston, and the first infusion tube and the second infusion tube are respectively communicated with the upper cavity and the lower cavity.

10. The clamping device as claimed in claim 9, wherein the drive means comprises a motor and a delivery pump;

the motor is connected with the delivery pump through a motor output shaft; the inlet end of the delivery pump is communicated with the outlet end of the liquid storage device, and the outlet end of the delivery pump is respectively communicated with the first infusion tube and the second infusion tube;

the first valve and the second valve are both solenoid valves.

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