CN212553893U

CN212553893U - Grab tool

Info

Publication number: CN212553893U
Application number: CN202021831813.2U
Authority: CN
Inventors: 薄涵亮; 姜胜耀; 张亚军; 赵陈儒; 王金海; 秦本科; 刘潜峰
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2020-08-27
Filing date: 2020-08-27
Publication date: 2021-02-19
Anticipated expiration: 2030-08-27

Abstract

The utility model relates to the technical field of mechanical assembling tools, and provides a grasping and lifting tool, comprising: a first component, a second component and a grasping and lifting component; the second component is sleeved outside the first component, and the second component is arranged to Axial movement of the first part; the gripping part includes a plurality of gripping parts rotatably connected to the first part, the second part being arranged to be movable along the axis of the first part can be moved in the direction of movement and can be sleeved on the outside of the grabbing member, so that the plurality of grabbing members can be switched between a grabbing position that is close to each other and an open position that is far away from each other by rotating relative to the first part . The grasping and lifting tool provided by the utility model has the advantages of simple structure and simple operation, is suitable for grasping and lifting of the control rod assembly in a nuclear reactor, and can meet the requirements of lifting the control rod assembly in a small space and a long distance by a buffer lock to lock the driving shaft of the control rod by an appropriate distance. requirements.

Description

Grabbing and lifting tool

Technical Field

The utility model relates to a mechanical assembly tool technical field especially relates to grabs and carries instrument.

Background

In the related art of mechanical part installation, the position of equipment or a workpiece needs to be adjusted in the process of assembling and disassembling the equipment, but most of mechanical parts are limited by space or environment, are difficult to directly contact and operate, and need to use special tools.

The hydraulic driving technology of the control rod of the nuclear reactor is a built-in control rod driving technology, a driving mechanism of the hydraulic driving technology is arranged in a high-temperature, high-pressure and irradiation environment in a reactor pressure container, and three hydraulic cylinders are used for lifting, transferring and clamping to sequentially drive and transfer and clamp two sets of control rod assemblies to move, so that the functions of controlling the rod assemblies to ascend, descend and fall are realized. In a nuclear reactor, a buffer lock is required to lock a driving shaft of a control rod assembly, and in the installation process of a spring box component, the control rod assembly needs to be grabbed and lifted in a small space and a long distance range, so that the technical personnel are troubled by how to realize the grabbing and the lifting of the control rod assembly. And in the related art of mechanical component assembly, a tool suitable for gripping a workpiece is not found.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a grab and carry instrument, simple structure and easy and simple to handle.

According to the utility model discloses grab and carry instrument, include:

a first member;

the second component is sleeved outside the first component and can move along the axial direction of the first component;

the grabbing and lifting component comprises a plurality of grabbing and lifting pieces, the grabbing and lifting pieces are rotatably connected to the first component, the second component can move along the axial direction of the first component and can be sleeved on the outer side of the grabbing and lifting pieces, and therefore the grabbing and lifting pieces can be switched between mutually close grabbing positions and mutually far opening positions through rotation relative to the first component.

According to the utility model discloses an embodiment, it is a plurality of grab and carry and be equipped with first piece that resets between the piece, the tip that first resets is connected respectively grab and carry the piece in order to pass through the restoring force drive of first piece that resets grab and carry the piece and keep away from each other.

According to the utility model discloses an embodiment, first part is equipped with the fixed part, be equipped with the second on the first part and reset the piece, the second resets the both ends of piece and connects respectively the fixed part with the second part.

According to an embodiment of the present invention, the gripping member further comprises a driving member for driving the second member to move in the axial direction of the first member, the driving member is provided at an end of the second member remote from the gripping member.

According to an embodiment of the invention, the first part comprises a threaded shaft;

the driving part comprises a driving nut, the driving nut is attached to the end part of the second part, and the driving nut is rotatably connected to the threaded shaft.

According to the utility model discloses an embodiment, be connected with the handle on the screw shaft.

According to an embodiment of the present invention, the side wall of the gripping member for gripping the workpiece is connected with a protective pad.

According to the utility model discloses an embodiment, it is equipped with two, two to grab the first end of carrying the piece and set up to rotate along same axis grab and carry the position, two it encloses into cylindricality spacing space to grab and carry the piece.

According to an embodiment of the invention, the second end of the gripping member is provided with a guiding surface.

According to an embodiment of the present invention, one of the first member and the second member is provided with a guide portion, and the other is provided with a positioning portion that can be moved along the guide portion.

The embodiment of the utility model provides an in above-mentioned one or more technical scheme, one of following technological effect has at least:

the embodiment of the utility model provides a grab and carry instrument, including first part, second part and grab and carry the part, the second part cover is established outside first part, grabs and carries the part and include a plurality of grab and carry the piece, a plurality of grabs and carry the piece and can establish under the effect and draw close to each other to grab and carry the position at the cover of second part, perhaps, a plurality of grabs and carry the piece and can establish the effort along with the cover of second part and reduce and keep away from each other to opening the position, the position of grabbing and carrying the piece switches portably, conveniently switches and grabs and carry the state and open the state, and is easy and simple to handle, and application scope is wide. When the grabbing tool of the embodiment is applied to the grabbing process of the control rod assembly in the nuclear reactor, the requirement that the control rod assembly needs to be lifted for a proper distance in a small space and a long distance when the control rod driving shaft is locked by the buffer lock can be met, and the grabbing tool has the characteristics of simple structure and convenience in operation.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

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

Fig. 1 is a schematic structural view of a gripping tool provided in an embodiment of the present invention; wherein the gripping member is in the open position;

FIG. 2 is a schematic view of a portion A of FIG. 1;

FIG. 3 is a partially enlarged view of the portion B in FIG. 1;

fig. 4 is a schematic structural diagram of a gripping tool provided in an embodiment of the present invention; wherein the gripping member is in a gripping position;

FIG. 5 is a partial enlarged view of the portion C in FIG. 4;

fig. 6 is a schematic structural diagram of a grabbing tool provided by the embodiment of the present invention in an exploded state;

fig. 7 is a schematic structural view of a gripping member of a gripping tool according to an embodiment of the present invention.

Reference numerals:

1: a first member; 11: a threaded shaft; 12: a connecting pipe; 13: a connector; 131: a first connection hole; 14: a limit screw; 15: a fixed part;

2: a second component; 21: a guide groove; 22: a support portion; 23: a socket joint part;

3: a gripping member; 31: a grasping member; 311: a guide surface; 312: a second connection hole; 313: mounting grooves; 314: fixing grooves; 32: a first reset member; 33: a protective pad;

4: a second reset member; 5: a drive member; 51: a drive nut; 52: a handle; 6: a connecting shaft; 7: and (5) a workpiece.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the embodiments of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the embodiments of the present invention and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the embodiments of the present invention can be understood in specific cases by those skilled in the art.

In embodiments of the invention, 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 herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

An embodiment of the present invention, as shown in fig. 1 to 7, provides a grasping tool, including: a first part 1, a second part 2 and a gripping part 3. The second component 2 is sleeved outside the first component 1, and the second component 2 can move along the axial direction of the first component 1; the gripping member 3 includes a plurality of gripping members 31, the gripping members 31 are rotatably connected to the first member 1, and the second member 2 is provided to be movable in the axial direction of the first member 1 and to be fitted over the outer sides of the gripping members 31, so that the plurality of gripping members 31 are switched between a gripping position where they are close to each other and an open position where they are away from each other by rotating with respect to the first member 1.

When the workpiece 7 needs to be grabbed, as shown in fig. 1 and 3, the external force drives the second component 2 to axially move to a first position relative to the first component 1, the limiting acting force of the second component 2 on the grabbing pieces 31 is reduced or eliminated, the grabbing pieces 31 are in an open position, at this time, the workpiece 7 can be inserted into the limiting space between the grabbing pieces 31, after the workpiece 7 is inserted, as shown in fig. 4 and 5, the external force drives the second component 2 to axially move relative to the first component 1 again so as to move the second component 2 to a second position, at this time, the limiting acting force provided by the second component 2 to the grabbing pieces 31 is increased, the grabbing pieces 31 mutually tighten to the grabbing positions, at this time, the clamping force of the grabbing pieces 31 clamps and fixes the workpiece 7, the workpiece 7 can move under the action of the grabbing pieces 31, and the grabbing process of the workpiece 7 is simple and convenient to operate.

When the workpiece 7 does not need to be gripped, the position of the second member 2 is not limited, and the position of the second member 2 is flexible. Wherein the second part 2 may be located in the first position, the second position or any position between the first position and the second position. The position adjustment of the second member 2 relative to the first member 1 may be such that the first member 1 is fixed, the second member 2 is moved, or the second member 2 is fixed, the first member 1 is moved, as long as the relative position of the first member 1 and the second member 2 is changed such that the gripping members 31 are adjusted between the gripping position and the open position.

The gripping tool of the embodiment can be applied to various workpieces 7 to be gripped, and the size and the shape of the gripping member 3 can be designed according to the size and the shape of the workpiece 7 to be gripped so as to meet the gripping operation of the workpiece 7 to be gripped. The gripping member 31 is switched between the gripping position and the open position by being rotated relative to the first member 1, and the position of the gripping member 31 is switched flexibly.

The following describes the present embodiment in detail, taking as an example the case where the grasping tool of the present embodiment is applied to the grasping process of a control rod assembly in a nuclear reactor.

When the workpiece 7 to be grabbed and lifted is a control rod assembly, the control rod assembly comprises a driving shaft and a rod position measuring rod, and in the installation process of the spring box component, the driving shaft is locked by the buffer lock, and the rod position measuring rod needs to be lifted for a proper distance so as to meet the installation requirement of the spring box component. Referring to fig. 1 from fig. 4, the second member 2 is switched from the second position to the first position (the second member 2 is lifted upwards), the plurality of gripping members 31 are in the open position, at this time, the rod position measuring rod is inserted between the gripping members 31 to form a limit space, then, the second member 2 is driven by external force to move from the first position to the second position, referring to fig. 1 to 4, the second member 2 moves downwards, the gripping members 31 are mutually folded to the gripping position under the action of the sleeving pressure of the second member 2, and the gripping members 31 clamp the rod position measuring rod, at this time, the gripping member 7 of the present embodiment can lift the rod position measuring rod to meet the installation requirement of the spring box member.

Embodiments of the gripping member 31 are provided below.

In one embodiment, as shown in fig. 1 and fig. 3 to fig. 5, a first restoring member 32 is disposed between the plurality of gripping members 31, and ends of the first restoring member 32 are respectively connected to the gripping members 31 to drive the gripping members 31 away from each other by restoring force of the first restoring member 32. When the second component 2 reduces or releases the limiting acting force on the grabbing pieces 31, the grabbing pieces 31 automatically move away under the action of the restoring force of the first resetting piece 32, the process that the grabbing pieces 31 return to the opening position does not need manual operation, the operation process can be simplified, and only the first resetting piece 32 needs to be arranged between the grabbing pieces 31, so that the structure is simple.

The first restoring member 32 may be an elastic member, such as a spring, an elastic air bag, or the like. Referring to fig. 1, 3 to 5, the first restoring member 32 is a spring, the grasping members 31 are in the grasping position, the spring is in a compressed state, the spring drives the grasping members 31 to move away from each other through elastic force to switch to the opening position, the plurality of grasping members 31 can be automatically opened under the action of the spring, manual operation is not needed, and the workpiece 7 can be conveniently inserted into the limiting space between the grasping members 31.

With reference to the above embodiments and fig. 1 to 6, each of the gripping members 31 has a mounting groove 313, and the mounting grooves 313 are used for mounting the first restoring member 32 (shown as a spring), so that the first restoring member 32 drives the gripping members 31 to open.

In one embodiment, as shown in fig. 1, 4 and 7, two gripping members 31 are provided, and the number of the gripping members 31 is small, so that the installation is simple. The first ends of the two gripping members 31 are arranged to rotate along the same axis, the two gripping members 31 rotate coaxially, and the first member 1 is provided with only one shaft or one shaft hole, so that the assembly of the two gripping members 31 can be satisfied, and the installation of the gripping members 31 can be simplified.

The first end and the second end are two ends of the lifting member 31, the first end is rotatably connected to the first member 1, and the second end is an end of the lifting member 31 which is folded or unfolded.

Referring to fig. 3, 5 and 6, the first member 1 includes a threaded shaft 11 (refer to the following embodiments), a connecting pipe 12 and a connecting head 13, two ends of the connecting pipe 12 are respectively connected to the connecting head 13 and the threaded shaft 11, a first through connecting hole 131 is formed in the connecting head 13, a second through connecting hole 312 is formed in each of the two grasping pieces 31, the connecting shaft 6 penetrates through the first connecting hole 131 and the second connecting hole 312, and both the two grasping pieces 31 rotate along the axis of the connecting shaft 6. As shown in fig. 1 to 6, the connecting shaft 6 is a combined structure of a bolt and a nut, and is easy to assemble and disassemble and low in cost. Of course, the connecting shaft 6 may also be a pin, a round bar, or other structures. It should be noted that the connection between the gripping member 31 and the connecting head 13 is not limited to the connection through the connecting shaft 6, and a shaft structure may be provided on one of the gripping member 31 and the connecting head 13, and a hole structure adapted to the other may be provided, so that the gripping member 31 and the connecting head 13 may be directly connected, and the structure is further simplified.

Wherein, connector 13 and connecting pipe 12 still can be the integral type structure, for example the both ends welding screw thread axle 11 and connector 13 of connecting pipe 12, connect firmly, further reduce the part. The two ends of the connecting pipe 12 are respectively connected with the threaded shaft 11 and the connector 13 through threads, so that the disassembly and the assembly are convenient.

Of course, the number of the gripping members 31 is not limited to two, and the gripping members 31 may be three, four, or the like (not illustrated in the drawings), and the number of the gripping members 31 is not limited. When the number of the gripping members 31 is greater than two, the gripping members 31 cannot rotate coaxially, and each gripping member 31 can rotate along a respective predetermined axis. The first restoring member 32 is provided between the grasping members 31 regardless of the number of the grasping members 31.

In one embodiment, as shown in fig. 1 and fig. 3 to fig. 7, the second ends of the gripping members 31 are provided with guide surfaces 311, the second ends of the gripping members 31 can move toward each other to a gripping position or away from each other to an open position, when the gripping members 31 are in the open position, the guide surfaces 311 play a role of guiding the workpiece 7, so as to ensure that the workpiece 7 smoothly enters the spacing space between the gripping members 31.

The guide surfaces 311 of the plurality of gripping members 31 are spliced to form a conical curved surface, the large end of the conical curved surface faces downwards, and the small end of the conical curved surface faces upwards, so that the rod position measuring rod of the control rod assembly can be accurately and quickly inserted into the limiting space between the gripping members 31.

In this embodiment, the first and second ends are the same as in the previous embodiment, the second end being the end (first end) pivotally connected to the first member 1 remote from the gripping member 31.

In one embodiment, as shown in fig. 1, 3 to 6, a protective pad 33 is attached to a side wall of the grasping member 31 for grasping the workpiece 7. The protective pad 33 plays a role of pad protection between the gripping member 31 and the workpiece 7, so that friction between the gripping member 31 and the workpiece 7 is reduced, and further abrasion of the workpiece 7 in a gripping process is reduced.

The protective pad 33 can be made of rubber, plastic or foam, the protective pad 33 is made of a rubber pad, friction force between the rubber pad and the workpiece 7 can further play a role in preventing the workpiece 7 from moving, and grabbing stability is improved.

As shown in fig. 6 and 7, the fixing groove 314 is formed on the grasping member 31, and the protection pad 33 is fixed in the fixing groove 314, which is simple in structure. When two grab handles 31 are provided, the grab handle 31 is provided with fixing grooves 314 having a semicircular section, and the two fixing grooves 314 are spliced to form a cylindrical hole for inserting a rod position measuring rod of the control rod assembly.

Embodiments of the first component 1 and the second component 2 are provided below.

In one embodiment, as shown in fig. 1 and fig. 2, the first component 1 is provided with a fixing portion 15, the first component 1 is sleeved with a second resetting member 4, two ends of the second resetting member 4 are respectively connected with the fixing portion 15 and the second component 2, and the restoring force of the second resetting member 4 is used for driving the second component 2 to move along the axial direction of the first component 1 so as to move the grabbing parts 31 away from each other and switch to the open position.

The second restoring member 4 may also be an elastic component, such as a spring, an elastic airbag, or the like. Referring to fig. 1 and 4, the second restoring member 4 is a spring, the gripping member 31 is moved from the open position to the gripping position, the second restoring member 4 is compressed, and when the gripping member 31 needs to be returned from the gripping position to the open position, the resilience of the second restoring member 4 can drive the second member 2 to move, so that the structure is simple and labor-saving.

Referring to fig. 2, the first member 1 includes the connection tube 12 in the above embodiment, and the fixing portion 15 is an annular protrusion disposed on an outer wall of the connection tube 12 and plays a role of supporting the second restoring member 4. Of course, when the first member 1 includes the threaded shaft 11 in the embodiments described below, the fixing portion 15 may also be an annular projection provided on the outer wall of the threaded shaft 11. The second part 2 is a tube structure, and the second part 2 is opened corresponding to the position of the second resetting piece 4, so that the state of the second resetting piece 4 in the second part 2 can be observed conveniently.

In one embodiment, as shown in fig. 1, 2 and 4, the gripping tool further comprises a driving member 5 for driving the second member 2 to move along the axial direction of the first member 1, the driving member 5 being provided at an end of the second member 2 remote from the gripping member 3. The driving member 5 provides a driving force for the movement of the second member 2 at an end remote from the gripping member 3 without interfering with the gripping member 3 and the second member 2 is positionally defined by the driving member 5, ensuring that the second member 2 is adjusted between the first and second positions.

The driving component 5 is a component capable of providing linear motion power, such as an air cylinder, a hydraulic cylinder, or a linear motor, the housing of the driving component 5 is fixed on the first component 1, the moving end of the driving component 5 is connected with the second component 2 to drive the second component 2 to move linearly along the axis of the first component 1, and then the second ends of the gripping pieces 31 get close to or get away from each other.

In one embodiment, as shown in connection with fig. 1, 2 and 4, the first component 1 comprises a threaded shaft 11; the drive member 5 includes a drive nut 51, the drive nut 51 being attached to an end of the second member 2, the drive nut 51 being rotatably connected to the threaded shaft 11. Through the cooperation of drive nut 51 and threaded shaft 11, convert the power of rotating into the power of second part 2 linear motion, make the drive second part 2 remove between first position and second position, simple structure, and need not to increase power parts.

When the first unit 1 includes the connection pipe 12 and the connection head 13, the screw shaft 11 and the connection head 13 are connected to both ends of the connection pipe 12, respectively. As shown in fig. 1 and 4, the screw shaft 11 is connected to an upper end of the connection pipe 12, and the coupling head 13 is connected to a lower end of the connection pipe 12.

When the grabbing workpiece 7 comprises the driving part 5 and the second resetting piece 4, the driving part 5 limits the second part 2 to move upwards, the second resetting piece 4 limits the second part 2 to move downwards, and under the dual action of the driving part 5 and the second resetting piece 4, the first part 1 and the second part 2 are stably fixed, so that the safety and stability of the grabbing process are ensured.

In one embodiment, as shown in fig. 1, 2 and 4, a handle 52 is attached to the threaded shaft 11 to facilitate gripping by a user to rotate the drive nut 51.

Two handles 52 are symmetrically arranged on two sides of the driving nut 51, and a user can hold the two handles 52 to rotate the driving nut 51, so that the second component 2 is driven linearly, and the operation is convenient.

In one embodiment, as shown in fig. 1 and 4, one of the first member 1 and the second member 2 is provided with a guide portion, and the other is provided with a positioning portion movable along the guide portion. The guide part is matched with the positioning part to guide the relative movement of the first component 1 and the second component 2 so as to ensure the stability of the relative movement of the first component 1 and the second component 2.

As shown in fig. 1 and 4 in conjunction, the gripping member 31 is in the gripping position, and the positioning portion is positioned at the lower end of the guide portion, and the gripping member 31 is in the open position, and the positioning portion is positioned at the upper end of the guide portion.

In one embodiment, the positioning part is a limit screw 14 fixed on the first component 1, and the guide part is a guide groove 21 formed on the second component 2, so that the structure is simple, and the installation is simple and convenient.

Of course, the structure of the positioning portion is not limited to the limit screw 14, and the positioning portion may be a pin or a projection connected to the first member 1.

In one embodiment, the second component 2 includes a tube structure, one end of the second component 2 is provided with a supporting portion 22, the other end of the second component 2 is provided with a sleeve portion 23, the supporting portion 22 is used for supporting the driving nut 51 and abutting against the second reset piece 4, the sleeve portion 23 is sleeved on the outer side of the grabbing component 3, and the thicknesses of the supporting portion 22 and the sleeve portion 23 are both greater than the thickness of the tube structure, so as to strengthen the strength of the second component 2.

Wherein, the sleeve portion 23 may be made of a smooth material to reduce the friction between the sleeve portion 23 and the gripping member 31.

In a particular embodiment, the gripping means comprises a first part 1, a second part 2, a gripping part 3, a driving part 5 and a second restoring member 4. The first part 1 comprises a fixedly connected threaded shaft 11, a connecting tube 12 and a connecting head 13. The driving nut 51 is sleeved on the threaded shaft 11, and the driving nut 51 is symmetrically connected with the handle 52. The lower end of the driving nut 51 abuts against the supporting portion 22 of the second component 2, the threaded shaft 11 and the outer side of the connecting pipe 12 are sleeved with the second resetting piece 4, one end of the second resetting piece 4 abuts against the fixing portion 15 of the connecting pipe 12, one end of the second resetting piece 4 abuts against the supporting portion 22 of the second component 2, the second resetting piece 4 provides a restoring force for the second component 2 to ascend, and the driving component 5 provides a driving force for the second component 2 to descend. The second member 2 is provided with a guide groove 21, the stopper screw 14 fixed to the connection pipe 12 is movable in the guide groove 21, and the guide groove 21 defines an upper limit position and a lower limit position at which the second member 2 is lifted and lowered with respect to the first member 1. The lower end of the second part 2 is fitted over the outer side of the gripping part 3. The grabbing and lifting part 3 comprises two grabbing pieces 31, the first ends of the two grabbing pieces 31 are rotatably connected to the connecting head 13 of the first part 1 through the connecting shaft 6, the fixing grooves 314 of the two grabbing pieces 31 are connected with the protective pads 33, the protective pads 33 are protected between the grabbing pieces 31 and the workpiece 7, and the first reset piece 32 is arranged between the two grabbing pieces 31 to drive the grabbing pieces 31 to be opened. When the grapples 31 need to be far away from each other to an open position, the screw driving nut 51 is screwed to ascend, at the moment, the second component 2 ascends under the action of the restoring force of the second restoring member 4, the limiting acting force of the second component 2 on the grapples 31 is reduced or disappears, the grapples 31 can be opened under the action of the restoring force of the first restoring member 32, and the control rod measuring rod can be inserted into the limiting space between the grapples 31; when the grasping members 31 need to be mutually closed to the grasping position, the driving nut 51 is screwed to descend, at this time, the second member 2 descends under the pressure of the driving nut 51 against the resistance of the second restoring member 4, the limiting acting force of the second member 2 on the grasping members 31 is increased, and the grasping members 31 are mutually closed against the resistance of the first restoring member 32 to fix the rod position measuring rod between the grasping members 31.

The grabbing tool of the embodiment is applied to the installation process of the spring box component, meets the requirement that the buffer lock locks the control rod driving shaft and needs to lift the control rod assembly for a proper distance in a small space and a long distance, and has the characteristics of simple structure and convenience in operation. The grabbing tool is suitable for engineering and productization, ensures the engineering application of the control rod built-in water pressure driving technology, not only meets the engineering application of the control rod built-in water pressure driving technology on an advanced integrated small water reactor with the thermal power less than 50MW, but also provides reference for the engineering design of special structure installation in other industrial fields.

The above embodiments are merely illustrative, and not restrictive, of the present invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalent substitutions may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all of the technical solutions should be covered by the scope of the claims of the present invention.

Claims

1. a grabbing tool, is characterized in that, comprises:

the first part;

a second component sleeved outside the first component and configured to move along the axial direction of the first component;

The grasping and lifting part includes a plurality of grasping and lifting parts, and the plurality of the grasping and lifting parts are all rotatably connected to the first part, and the second part is arranged to be movable along the axial direction of the first part and can be sleeved on the outside of the grabbing members, so that the plurality of grabbing members can be switched between the grabbing positions that are close to each other and the open positions that are far away from each other by rotating relative to the first component.

2 . The grasping and lifting tool according to claim 1 , wherein a first restoring member is provided between the plurality of grasping and lifting members, and ends of the first restoring member are respectively connected to the grasping and lifting members to The grasping and lifting members are driven away from each other by the restoring force of the first restoring member.

3 . The grasping and lifting tool according to claim 1 , wherein the first part is provided with a fixing part, the first part is provided with a second reset member, and two ends of the second reset member are respectively The fixing portion and the second member are connected.

4 . The grasping tool according to claim 1 , further comprising a driving member for driving the second member to move in the axial direction of the first member, the driving member being provided on the first member. 5 . The two parts are remote from one end of the gripping part.

5. The grasping and lifting tool according to claim 4, characterized in that,

the first part includes a threaded shaft;

The driving component includes a driving nut, the driving nut is attached to the end of the second component, and the driving nut is rotatably connected to the threaded shaft.

6 . The grasping and lifting tool according to claim 5 , wherein a handle is connected to the threaded shaft. 7 .

7 . The grasping and lifting tool according to claim 1 , wherein a protective pad is connected to a side wall of the grasping and lifting member for grasping and lifting the workpiece. 8 .

8 . The grasping and lifting tool according to claim 1 , wherein there are two grasping and lifting members, and the first ends of the two grasping and lifting members are configured to rotate along the same axis. 9 . , in the grasping and lifting position, the two grasping and lifting pieces enclose a cylindrical limiting space.

9 . The grasping and lifting tool according to claim 1 , wherein the second end of the grasping and lifting member is provided with a guide surface. 10 .

10. The grasping and lifting tool according to any one of claims 1 to 6, wherein one of the first part and the second part is provided with a guide part, and the other is provided with a guide part that can be moved along the The positioning part that the guide part moves.