Valve rod lifting device

Abstract

The utility model discloses a valve rod lifting device which comprises a first main body piece, a second main body piece, a folding arm, a joint assembly and a connecting component. By arranging the connecting component, the valve rod lifting device is connected with the valve rod, and the valve rod is driven to move to forcibly open the valve when the connecting component moves; specifically, the connecting component comprises a connecting piece and a valve rod connecting shaft, the connecting piece is arranged between the first main body piece and the valve rod connecting shaft, the two axial ends of the connecting piece are connected with the first main body piece and the valve rod connecting shaft respectively, external threads are arranged on the side, close to the first end of the valve rod, of the valve rod connecting shaft, and a threaded hole is formed in the first end of the valve rod. During use, the valve rod connecting shaft is driven to extend into the actuator and is connected with the threaded hole in the first end of the valve rod through the external thread on the valve rod connecting shaft, so that the valve rod can be connected with a connecting component only by forming the threaded hole in the valve rod, and the original structure of the valve or the actuator does not need to be changed; and the existing valve in use does not need to be greatly changed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to valve technical field especially relates to a valve rod lifting device. BACKGROUND

[0002] In the design and application of straight stroke electric valve, such as common electric gate valve and globe valve, its operating mechanism depends on the precise thread interaction between valve rod nut and valve rod to drive the gate or valve disc to complete the opening and closing action. However, as a key transmission component, the valve rod nut is often damaged due to thread wear caused by long-time operation, and once it fails, it will directly cause the actuator to idle, and then the valve will lose the control function and cannot open and close the valve.

[0003] Especially in the operation and maintenance practice of photo-thermal power station, the valve rod nut wear of the steam-water side valve can be maintained by replacement and repair to maintain system operation, but for the key valve on the molten salt side, such as the heat absorber valve, once the nut cannot be opened due to wear, it will directly cause the molten salt to freeze and block inside the heat absorber, causing major operation interruption and economic loss. Therefore, it is particularly urgent to develop an efficient and adaptable valve rod emergency lifting solution to ensure that the valve control ability can be quickly restored in an emergency. SUMMARY

[0004] In view of the problems in the background art, the utility model aims to provide a valve rod lifting device, comprising a first main body, a second main body, a folding arm, a joint assembly and a connecting member;

[0005] At least one folding arm is arranged between the first main body and the second main body, and the joint assembly is configured to fold or stretch the folding arm to move the first main body relative to the second main body;

[0006] The connecting member is detachably arranged on the first main body, or the connecting member is fixedly arranged on the first main body;

[0007] The connecting member is configured to be connected with the first end of the valve rod to move the valve rod in the axial direction of the valve rod;

[0008] Among them, the first end of the valve rod is the end of the valve rod away from the valve.

[0009] As a preferred, the folding arm comprises two folding arm members;

[0010] One end of the folding arm member in the axial direction is the first end, and the other end of the folding arm member in the axial direction is the second end;

[0011] The two folding arm members in the same folding arm are respectively a first folding arm member and a second folding arm member;

[0012] The first end of the first folding arm member is arranged on the first main body, and the first end of the second folding arm member is arranged on the second main body.

[0013] Preferably, two folding arms are symmetrically arranged between the first main body and the second main body, and the joint assembly comprises two joint members and a support rod.

[0014] One of the joint members is rotationally connected to one end of the support rod, and the other joint member is threadedly connected to the other end of the support rod.

[0015] Preferably, the two joint members are arranged in the two folding arms respectively, and the joint members are hingedly connected to the second ends of the two folding arm members in the same folding arm.

[0016] Preferably, the connecting member is provided with a through groove, and the support rod is arranged in the through groove.

[0017] Preferably, the through groove is arranged along the axial direction of the valve rod and penetrates the connecting member along the radial direction of the valve rod.

[0018] Preferably, the connecting member comprises a coupling member and a valve rod connecting shaft, the coupling member is arranged between the first main body and the valve rod connecting shaft and connected to both of them at both axial ends, the valve rod connecting shaft is used to connect to the first end of the valve rod, and the through groove is arranged on the coupling member.

[0019] Preferably, the second end of the first folding arm member in the same folding arm is hingedly connected to the second end of the second folding arm member.

[0020] The joint assembly comprises a support rod arranged between the first folding arm member and the second folding arm member, and the support rod is configured to change the included angle between the axis of the first folding arm member and the horizontal plane and the included angle between the axis of the second folding arm member by telescoping.

[0021] Preferably, the axis of the first folding arm member and the axis of the second folding arm member are located in the same plane.

[0022] Preferably, the support rod comprises a first part and a second part, the first part of the support rod is provided with external threads, the second part of the support rod is provided with a threaded hole, the first part of the support rod is arranged in the second part of the support rod and threadedly connected to the second part of the support rod.

[0023] Preferably, the second main body is a shaft sleeve, and the connecting member is arranged in and slidingly connected to the shaft sleeve.

[0024] As preferred, the connecting member is provided with external thread on one side close to the first end of the valve rod, the first end of the valve rod is provided with a threaded hole, and the connecting member is screwed with the valve rod through the external thread and the threaded hole.

[0025] As preferred, the lengthening structure is further included;

[0026] The lengthening structure is detachably arranged on the first end of the valve rod, or the lengthening structure is fixedly arranged on the first end of the valve rod.

[0027] The lengthening structure is configured to be connected with the connecting member.

[0028] The utility model discloses the following advantages and positive effects compared with the prior art due to the adoption of the above technical scheme:

[0029] 1、 the valve rod lifting device in the utility model through setting connecting member, with valve rod lifting device and valve rod are connected to, and drive valve rod to move to force to open valve when connecting member moves, specifically, connecting member includes coupling and valve rod connecting shaft, and coupling is arranged between first main part and valve rod connecting shaft and its axial two ends are connected respectively two, the outer thread is arranged on one side close to the first end of valve rod connecting shaft, and the threaded hole is arranged on the first end of valve rod, and when using, the dust cover of actuator is opened, and drive valve rod connecting shaft extends into actuator and is connected through the external thread on valve rod connecting shaft and the threaded hole on the first end of valve rod, and the advantage of this design is that only need to set threaded hole on valve rod can realize the connection with connecting member, need not change valve or actuator originally structure, need not make great change to the valve that the present existing is using.

[0030] 2. The valve rod lifting device in the utility model, through the symmetrical setting of two folding arms between the first main part and the second main part, and the setting of joint assemblies between the two folding arms, the folding arms are folded or stretched through the joint assemblies, and the valve rod is driven to move to forcibly open the valve; specifically, two folding arms are symmetrically arranged between the first main part and the second main part, each folding arm comprises two folding arm members, one end of the folding arm member in the axial direction is defined as the first end, and the other end of the folding arm member in the axial direction is defined as the second end; and in the same folding arm, the two folding arm members are defined as the first folding arm member and the second folding arm member, the first end of the first folding arm member is arranged on the first main part, and the first end of the second folding arm member is arranged on the second main part. The joint assembly comprises two joint parts and a support rod, the two joint parts are respectively installed in the two folding arms, the two ends of the joint part in the axial direction are respectively hinged to the second ends of the two folding arm members in the same folding arm, and the support rod is installed between the two joints, one end of the support rod is rotatably connected with any one joint part, and the other end of the support rod is threadedly connected with the other joint part, so that the two joint parts are close or far away through the rotation of the support rod, and the folding arms are folded or stretched, and the valve rod can be driven to move through the rotation of the support rod, the purpose of saving labor is achieved, and the effect of easily lifting the valve rod of the large-diameter valve and opening the valve by manpower is achieved through the above setting.

[0031] 3. The valve rod lifting device in the utility model discloses discarding the use of hydraulic drive parts and electric drive parts, thereby realizing the compactness and light weight of the structure, which is not only convenient to carry and move, but also greatly widens the applicable scenarios. Especially when facing special valve positions with limited installation space, the traditional valve rod lifting device with hydraulic or electric drive is often difficult to use due to the large size, while the design overcomes this limitation, and can easily implement work in a small space working environment, ensures the efficient application and operation flexibility under various complex working conditions, and significantly improves the practicality and emergency processing capacity. BRIEF DESCRIPTION OF DRAWINGS

[0032] The specific embodiments of the utility model will be further described in detail below in combination with the drawings, in which:

[0033] Fig. 1 The utility model discloses a valve installation schematic diagram;

[0034] Fig. 2 The utility model discloses a front view section;

[0035] Fig. 3 The utility model discloses a side view;

[0036] Fig. 4 The utility model discloses a top view.

[0037] Reference numerals:

[0038] 1. A valve stem lifting device; 11. A lifting cap; 12. A shaft sleeve; 13. A first folding arm member; 14. A joint member; 15. A brace rod; 16. A connecting member; 17. A through groove; 18. A valve stem connecting shaft; 19. A second folding arm member; 2. An actuator; 3. A valve; 31. A valve stem. DETAILED DESCRIPTION

[0039] The utility model will be explained in further detail below in combination with the drawings and specific embodiments. The advantages and features of the utility model will be more apparent according to the following description. It should be noted that all the drawings are in a very simplified form and all use non-precise ratios, only for the purpose of facilitating, clear and assisting the explanation of the utility model embodiments.

[0040] It should be noted that all the directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings), if the specific posture changes, the directional indications will also change accordingly.

[0041] Embodiment 1

[0042] Reference Figs. 1 to 4 A valve stem lifting device for forced lifting of the valve stem after the failure of the valve stem nut, suitable for opening and closing the valve after the failure of the valve stem nut of the straight stroke valve such as the stop valve and the gate valve.

[0043] The valve stem lifting device 1 of the utility model comprises a first main body member, a second main body member, a folding arm, a joint assembly and a connecting member.

[0044] In operation, the second main body member is arranged on the fixed part of the valve 3, and the connecting member is used to connect the valve stem 31 of the valve 3, and the movement of the valve stem 31 is driven by the movement of the connecting member. In this embodiment, the fixed part is the actuator 2, which is used to control the movement of the valve stem 31. Of course, in other embodiments, the valve stem lifting device can also be used after the actuator 2 is detached, and the specific use mode can be flexibly adjusted according to different working conditions.

[0045] At least one folding arm is arranged between the first main body member and the second main body member, and the joint assembly is configured to fold or stretch the folding arm to drive the first main body member to move relative to the second main body member; the connecting member is detachably arranged on the first main body member, or the connecting member is fixedly arranged on the first main body member, and the connecting member is configured to be connected with the first end of the valve stem 31 to drive the valve stem 31 to move along the axial direction of the valve stem 31; wherein the first end of the valve stem 31 is the end of the valve stem 31 away from the valve 3.

[0046] Specifically, referring to the drawingsFigs. 1 to 4 In the embodiment, two folding arms are symmetrically arranged between the first body member and the second body member, the two folding arms are in a diamond structure, each folding arm comprises two folding arm members, one end of the folding arm member in the axial direction is defined as the first end, and the other end of the folding arm member in the axial direction is defined as the second end; and in the same folding arm, the two folding arm members are respectively defined as the first folding arm member and the second folding arm member, generally, the first end of the first folding arm member is arranged on the first body member, and the first end of the second folding arm member is arranged on the second body member. The joint assembly comprises two joint members 14 and a support rod 15, the two joint members 14 are respectively arranged in the two folding arms, the two ends of the joint member 14 in the axial direction are respectively hingedly connected to the second ends of the two folding arm members in the same folding arm (i.e. the second ends of the first folding arm member and the second folding arm member in the same folding arm), and the support rod 15 is arranged between the two joints, generally, the mounting position of the support rod 15 on the joint member 14 is between the hinged connection point of the joint member 14 and the second end of the first folding arm member and the hinged connection point of the joint member 14 and the second end of the second folding arm member, the advantage of this design is to make the folding arm folding or stretching process more stable; one end of the support rod 15 is rotatably connected to any one of the joint members 14, and the other end of the support rod 15 is threadedly connected to the other joint member 14, so as to rotate the support rod 15 to make the two joint members 14 close to or away from each other, thereby realizing the folding or stretching of the folding arm. In other embodiments, the mounting position of the support rod on the joint member 14 can not be between the hinged connection point of the joint member 14 and the second end of the first folding arm member and the hinged connection point of the joint member 14 and the second end of the second folding arm member, and can be designed according to the specific working condition, as long as the rotation of the support rod 15 can make the two joint members 14 close to or away from each other.

[0047] Of course, in another specific embodiment, two folding arms can not be symmetrically arranged between the first body member and the second body member, for example, one folding arm, three folding arms or a plurality of folding arms are arranged between the first body member and the second body member, as long as the folding or stretching of the folding arm can drive the first body member to move relative to the second body member.

[0048] In the embodiment, the connecting member is provided with a through groove, the support rod is arranged in the through groove, and the through groove is arranged along the axial direction of the valve rod and penetrates the connecting member along the radial direction of the valve rod.

[0049] Specifically, referring to the accompanying drawings Figs. 1-3In the embodiment, the connecting member comprises a coupling piece 16 and a valve rod connecting shaft 18, the coupling piece 16 is arranged between the first main body and the valve rod connecting shaft 18 and is connected to both of them at the axial ends, the valve rod connecting shaft 18 is used for connecting with the first end of the valve rod 31, the second main body is the shaft sleeve 12, the valve rod connecting shaft 18 is arranged through and is connected to the shaft sleeve 12 in a sliding manner, the shaft sleeve 12 can limit the moving direction of the valve rod connecting shaft 18, and the first main body is the lifting cap 11. The valve rod connecting shaft 18 is provided with external threads on the side close to the first end of the valve rod 31, and the first end of the valve rod 31 is provided with a threaded hole (in general, the valve rod 31 is designed to be provided with the threaded hole at the first end when it is delivered from the factory, of course, the threaded hole at the first end of the valve rod 31 can also be machined later). In use, the dust cover of the actuator 2 is opened, the valve rod connecting shaft 18 is driven to extend into the actuator 2, and the external threads on the valve rod connecting shaft 18 are connected with the threaded hole on the first end of the valve rod 31. The valve rod 31 of the valve 3 can be driven to move to forcibly open the valve 3 by the connecting member. Only the threaded hole needs to be arranged on the valve rod 31 to realize the connection with the connecting member, without changing the original structure of the valve 3 or the actuator 2, and without making great changes to the existing valve 3 in use. Of course, in other embodiments, the threaded hole can be arranged on the valve rod connecting shaft 18 in the connecting member and connected with the external threads arranged on the valve rod by threads, or the connecting member and the valve rod can be connected without threads, for example, by clamping or friction connection, and the like. The specific design can be made according to the actual working condition, as long as the movement of the valve rod connecting shaft 18 can drive the valve rod 31 to move along the axial direction of the valve rod 31.

[0050] Further, the coupling piece 16 is provided with a through groove 17, the supporting rod 15 is arranged through the through groove 17, and the through groove 17 is arranged along the axial direction of the valve rod 31 and penetrates the connecting member along the radial direction of the valve rod 31. The through groove 17 is arranged to avoid affecting the supporting rod when the coupling piece 16 moves up and down. Of course, in other embodiments, the coupling piece 16 can not be provided with the through groove 17, and the supporting rod 15 does not need to be arranged through the through groove 17, for example, the supporting rod 15 and the coupling piece 16 are staggered, or the coupling piece 16 is a special-shaped piece that moves up and down without affecting the supporting rod 15, and the like. The specific design can be made according to the working condition, as long as the up and down movement of the coupling piece 16 does not affect the supporting rod 15.

[0051] In the embodiment, the lengthening structure is detachably arranged on the first end of the valve rod, or the lengthening structure is fixedly arranged on the first end of the valve rod; and the lengthening structure is configured to be connectable with the connecting member.

[0052] Specifically, generally, the lengthened structure is integrated with the valve stem, that is, in actual cases, the valve stem is designed to be lengthened when the valve is shipped (the lengthened valve stem is referred to as a lengthened structure valve stem, which is used to distinguish the valve stem 31 described above), and the lengthened structure valve stem is still connected to the connecting member through threads on the side away from the valve (the threaded connection between the lengthened structure valve stem and the connecting member is that the threaded hole is arranged on the lengthened structure valve stem, and the external thread is arranged on the connecting member, or the threaded hole is arranged on the connecting member, and the external thread is arranged on the lengthened structure valve stem), and the advantage of this design is that the original structure of the valve or the actuator does not need to be changed, and the existing valve in use does not need to be greatly modified, and the actuator of the existing valve does not need to be removed in use, thereby minimizing the interference with the existing equipment and the potential risk of shutdown, and significantly improving the flexibility and efficiency of maintenance and emergency treatment; of course, in other embodiments, a detachable lengthened structure can be added to the existing valve, one end of the lengthened structure can be connected to the first end of the valve stem, and the other end can be connected to the connecting member, and the specific arrangement of the lengthened structure can be designed according to the actual working condition.

[0053] Of course, the connection mode between the lengthened structure and the connecting member or the valve stem 31 is not limited to the threaded connection mode, but can also be a clamping mode or a friction connection mode, and the specific mode can be adjusted according to the use condition.

[0054] Further comprising an axial limiting piece arranged on the side where the supporting rod 15 is rotationally connected to the joint piece 14, and used for limiting the axial movement of the side where the supporting rod 15 is rotationally connected to the joint piece 14.

[0055] The working process of the utility model will be further described below:

[0056] Firstly, a threaded hole needs to be opened on the valve stem 31 of the valve 3, when the valve stem nut of the direct stroke electric valve 3 fails during use, the dust cover of the actuator 2 is opened, the valve stem connecting shaft 18 is inserted into the actuator 2 and is threadedly connected with the valve stem 31. Then the shaft sleeve 12 is placed on the actuator 2, the wrench or rocker is used to rotate the supporting rod 15, the supporting rod 15 drives the two joint pieces 14 to move towards each other under the rotation of the threads, so that the two folding arms are stretched, and the torque of the supporting rod 15 is transmitted to the shaft sleeve 12 and the lifting cap 11 by the two folding arms respectively, finally, since the shaft sleeve 12 is fixed on the actuator 2, the effect of the two folding arms after being stressed is to lift the lifting cap 11 upwards, the lifting cap 11 drives the connecting piece 16 and the valve stem connecting shaft 18 to move upwards, the valve stem connecting shaft 18 lifts the valve stem 31, so as to realize the effect of opening the valve 3.

[0057] Embodiment 2

[0058] A valve stem lifting device for forced lifting of a valve stem after failure of a valve stem nut, suitable for opening and closing a valve after failure of a valve stem nut of a straight stroke valve such as a globe valve or a gate valve.

[0059] The valve stem lifting device 1 comprises a first main body, a second main body, a folding arm, a joint assembly and a connecting member.

[0060] In operation, the second main body is arranged on a fixed part of the valve 3, and the connecting member is used to connect the valve stem 31 of the valve 3, and the connecting member is moved to drive the valve stem 31 to move. In this embodiment, the fixed part is the actuator 2, which is used to control the movement of the valve stem 31. Of course, in other embodiments, the valve stem lifting device can also be used after the actuator 2 is detached, and the specific use mode can be flexibly adjusted according to different working conditions.

[0061] The first main body and the second main body are provided with at least one folding arm, and the joint assembly is configured to fold or stretch the folding arm to drive the first main body to move relative to the second main body; the connecting member is detachably arranged on the first main body, or the connecting member is fixedly arranged on the first main body, and the connecting member is configured to be connected with the first end of the valve stem 31 to drive the valve stem 31 to move along the axial direction of the valve stem 31; wherein the first end of the valve stem 31 is an end of the valve stem 31 away from the valve 3.

[0062] In this embodiment, the folding arm comprises two folding arm members; one end of the folding arm member in the axial direction is the first end, and the other end of the folding arm member in the axial direction is the second end; the two folding arm members in the same folding arm are respectively a first folding arm member and a second folding arm member; the first end of the first folding arm member is arranged on the first main body, and the first end of the second folding arm member is arranged on the second main body; the second end of the first folding arm member in the same folding arm is hinged to the second end of the second folding arm member; the joint assembly comprises a support rod arranged between the first folding arm member and the second folding arm member, and the support rod is configured to change the included angle between the axis of the first folding arm member and the horizontal plane, and change the included angle between the axis of the second folding arm member and the horizontal plane by stretching and contracting; wherein the axis of the first folding arm member and the axis of the second folding arm member are located in the same plane.

[0063] Specifically, referring to the accompanying drawings Figs. 1 to 4In the embodiment, two folding arms are symmetrically arranged between the first body member and the second body member, each folding arm comprises two folding arm members, one end of the folding arm member in the axial direction is defined as the first end, the other end of the folding arm member in the axial direction is defined as the second end, and the two folding arm members in the same folding arm are defined as the first folding arm member and the second folding arm member, generally, the first end of the first folding arm member is arranged on the first body member, the first end of the second folding arm member is arranged on the second body member, and the second end of the first folding arm member and the second end of the second folding arm member in the same folding arm are hingedly connected. The joint assembly comprises a support rod (the support rod in the embodiment 2 is different from the support rod in the embodiment 1), the support rod is arranged between the first folding arm member and the second folding arm member, the support rod in the embodiment 2 comprises a first part and a second part, generally, the axis of the support rod is parallel to the axis of the valve rod after installation, and the first end and the second end of the two folding arm members in at least one folding arm are both provided with a hinge shaft (the hinge shaft arranged between the first end of the first folding arm member and the second end of the first folding arm member is rotatable, and the hinge shaft arranged between the first end of the second folding arm member and the second end of the second folding arm member is rotatable), and the axis of the hinge shaft is perpendicular to the plane formed by the two folding arm member axes in the folding arm (the folding arm refers to the folding arm in which the first folding arm member and the second folding arm member are both provided with the hinge shaft), and a hinge block is fixedly arranged on each hinge shaft; one end of the first part in the axial direction is rotatably arranged on the hinge block on the first folding arm member, the other end of the first part in the axial direction is provided with external threads, one end of the second part in the axial direction is rotatably arranged on the hinge block on the second folding arm member, the other end of the second part in the axial direction is provided with a threaded hole, the first part is arranged in the second part and is threadedly connected with the second part, and in actual use, the length of the support rod is changed by rotating the first part or the second part, so as to change the included angle between the axis of the first folding arm member and the axis of the second folding arm member (i.e. the included angle between the axis of the first folding arm member and the horizontal plane is changed, and the included angle between the axis of the second folding arm member and the horizontal plane is changed), thereby realizing the movement of the connecting member driven by the first body member, and further realizing the movement of the valve rod 31 along the axial direction of the valve rod 31. Of course, in other embodiments, the support rod can be more than two segments, for example, the support rod can be composed of three parts, four parts or multiple parts, and the multiple-part support rod can also be telescopic without threads, and in some cases, hydraulic or pneumatic methods can also be selected to make the multiple-part support rod telescopic, and the specific arrangement of the support rod can be designed according to the working conditions, as long as the included angle between the axis of the first folding arm member and the axis of the second folding arm member can be changed (i.e. the included angle between the axis of the first folding arm member and the horizontal plane is changed, and the included angle between the axis of the second folding arm member and the horizontal plane is changed).In some specific embodiments, the two ends of the support rod can not be mounted between the first folding arm member and the second folding arm member in the same folding arm, for example, are mounted between the first folding arm member and the second folding arm member in two folding arms respectively (i.e. the first folding arm member is a member in one folding arm and the second folding arm member is a member in the other folding arm), but no matter how to install, it is required to satisfy that the axis of the first folding arm member and the axis of the second folding arm member are located in the same plane.

[0064] Of course, in another specific embodiment, two folding arms can not be symmetrically arranged between the first main body and the second main body, for example, one folding arm, three folding arms or multiple folding arms are arranged between the first main body and the second main body, as long as the first main body can be moved relative to the second main body by folding or stretching the folding arm.

[0065] In the embodiment, referring to the accompanying drawings Figs. 1-3 The connecting member includes a coupling member 16 and a valve rod connecting shaft 18, the coupling member 16 is arranged between the first main body and the valve rod connecting shaft 18 and is connected to both of them at the axial ends, and the valve rod connecting shaft 18 is used to be connected with the first end of the valve rod 31. The second main body is a shaft sleeve 12, the valve rod connecting shaft 18 is arranged in and slidably connected to the shaft sleeve 12, and the shaft sleeve 12 can limit the moving direction of the valve rod connecting shaft 18. The first main body is a lifting cap 11. The valve rod connecting shaft 18 is provided with external threads on the side close to the first end of the valve rod 31, and the first end of the valve rod 31 is provided with a threaded hole (generally, the threaded hole on the valve rod 31 is designed when the valve rod 31 is factory-finished, and the first end of the valve rod 31 is provided with a threaded hole). The driving connecting shaft is inserted into the actuator 2 and is threadedly connected with the valve rod 31 through the external threads and the threaded hole. Specifically, the driving connecting shaft can be inserted into the actuator 2 by opening the dust cover of the actuator 2. The valve rod 31 can be moved by connecting the valve rod 31 of the valve 3 through the connecting member to forcibly open the valve 3. The valve rod 31 is only required to be provided with a threaded hole to realize the connection with the connecting member, and the original structure of the valve 3 or the actuator 2 does not need to be changed, and the existing valve 3 in use does not need to be greatly changed. Of course, in other embodiments, the threaded hole provided on the valve rod connecting shaft 18 of the connecting member can be threadedly connected with the external threads provided on the valve rod, or the connecting member and the valve rod can be connected in a manner other than threadedly, such as a clamping manner or a friction connection manner, etc. The specific design can be made according to the actual working condition, as long as the movement of the valve rod connecting shaft 18 can drive the valve rod 31 to move along the axial direction of the valve rod 31.

[0066] In the embodiment, the lengthening structure is detachably arranged on the first end of the valve rod, or the lengthening structure is fixedly arranged on the first end of the valve rod; and the lengthening structure is configured to be connectable with the connecting member.

[0067] Specifically, generally, the lengthened structure is integrated with the valve stem, that is, in actual situation, the valve stem is designed to be lengthened when the valve is shipped (the lengthened valve stem is referred to as a lengthened structure valve stem, which is used to distinguish the valve stem 31 mentioned above), and the lengthened structure valve stem is still connected to the connecting member through threads on the side away from the valve (the threaded connection between the lengthened structure valve stem and the connecting member is that the threaded hole is arranged on the lengthened structure valve stem, the external thread is arranged on the connecting member, or the threaded hole is arranged on the connecting member, and the external thread is arranged on the lengthened structure valve stem), which has the advantages that the original structure of the valve or the actuator does not need to be changed, the existing valve in use does not need to be greatly modified, the actuator of the existing valve does not need to be removed in use, the interference with the existing equipment and the potential shutdown risk are minimized, and the flexibility and efficiency of maintenance and emergency treatment are significantly improved; of course, in other embodiments, a detachable lengthened structure can be added to the existing valve, one end of which can be connected to the first end of the valve stem, and the other end can be connected to the connecting member, and the specific arrangement of the lengthened structure can be designed according to the actual working condition.

[0068] Of course, the connection mode between the lengthened structure and the connecting member or the valve stem 31 is not limited to the threaded connection mode, but can also be a clamping mode or a friction connection mode, and the specific mode can be adjusted according to the use condition.

[0069] The utility model discloses abandon the use of hydraulic drive component and electric drive component, thereby realize the compact and light weight of structure, not only convenient to carry and remove, still greatly widen its applicable scene. Especially when facing the special valve position of installation space limited, the traditional valve stem lifting device with hydraulic drive or electric drive is often difficult to display because of bulky, and the design overcomes this limitation, and can implement the work in the narrow space working environment, ensures the efficient application and operation flexibility under various complex working conditions, and significantly improves the practicability and emergency processing capacity.

[0070] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments. Even if various changes are made to the utility model, if the changes belong to the scope of the utility model claims and equivalent technologies, they still fall within the protection scope of the utility model.

Claims

1. A valve stem lifting device characterized by, The first body part, the second body part, the folding arm, the joint assembly and the connecting member are included. At least one folding arm is arranged between the first body part and the second body part, and the joint assembly is configured to fold or stretch the folding arm to drive the first body part to move relative to the second body part. The connecting member is detachably arranged on the first body part, or the connecting member is fixedly arranged on the first body part. The connecting member is configured to be connected with the first end of the valve rod to drive the valve rod to move along the axial direction of the valve rod. The first end of the valve rod is an end of the valve rod away from the valve.

2. The valve stem lifting device of claim 1, wherein, The folding arm includes two folding arm members. One end of the folding arm member in the axial direction is the first end, and the other end of the folding arm member in the axial direction is the second end. The first folding arm member and the second folding arm member are respectively arranged in the same folding arm. The first end of the first folding arm member is arranged on the first body part, and the first end of the second folding arm member is arranged on the second body part.

3. The valve stem lifting device of claim 2, wherein, Two folding arms are symmetrically arranged between the first body part and the second body part, and the joint assembly includes two joint members and a support rod. Any one of the joint members is rotationally connected with one end of the support rod, and the other joint member is threadedly connected with the other end of the support rod. The joint member is arranged in the two folding arms, and the joint member is hingedly connected with the second ends of the two folding arm members in the same folding arm.

4. The valve stem lifting device of claim 3, wherein, The connecting member is provided with a through groove, and the support rod is arranged in the through groove. The through groove is arranged along the axial direction of the valve rod and penetrates the connecting member along the radial direction of the valve rod.

5. The valve stem lifting device of claim 4, wherein, The connecting member includes a coupling member and a valve rod connecting shaft, the coupling member is arranged between the first body part and the valve rod connecting shaft, and the axial ends of the coupling member are connected with the first body part and the valve rod connecting shaft respectively, the valve rod connecting shaft is used for connecting with the first end of the valve rod, and the through groove is arranged on the coupling member.

6. The valve stem lifting device of claim 2, wherein, The second end of the first folding arm member is hingedly connected with the second end of the second folding arm member in the same folding arm. The joint assembly includes a support rod arranged between the first folding arm member and the second folding arm member, and the support rod is configured to change the included angle between the axis of the first folding arm member and the horizontal plane and the included angle between the axis of the second folding arm member by telescoping. The axis of the first folding arm member and the axis of the second folding arm member are located in the same plane.

7. A valve stem lifting device according to claim 6, wherein The support rod includes a first part and a second part, the first part of the support rod is provided with external threads, the second part of the support rod is provided with a threaded hole, and the first part of the support rod is arranged in the second part of the support rod and is threadedly connected with the second part of the support rod.

8. The valve stem lifting device of claim 1, wherein, The second body part is a shaft sleeve, and the connecting member is arranged in and slidably connected with the shaft sleeve.

9. A valve stem lifting device according to any one of claims 1-8, characterized in that The connecting member is provided with external threads on one side close to the first end of the valve stem, and the first end of the valve stem is provided with a threaded hole, and the connecting member is screwed with the valve stem through the external threads and the threaded hole.

10. A valve stem lifting device according to any one of claims 1-8, characterized in that Further comprising a lengthening structure; The lengthening structure is detachably arranged on the first end of the valve stem, or the lengthening structure is fixedly arranged on the first end of the valve stem. The lengthening structure is configured to be connectable with the connecting member.

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