CN112053789B

CN112053789B - Connecting device

Info

Publication number: CN112053789B
Application number: CN202010762551.7A
Authority: CN
Inventors: 薄涵亮; ***; 姜胜耀; 王金海; 秦本科; 赵陈儒; 刘潜峰
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2020-07-31
Filing date: 2020-07-31
Publication date: 2022-09-09
Anticipated expiration: 2040-07-31
Also published as: CN112053789A

Abstract

The invention relates to the technical field of reactor engineering, and provides a connecting device, which comprises: the clamping device comprises a connecting piece, a moving piece and a driving piece, wherein the connecting piece is rotationally connected with a plurality of clamping pieces, and the moving piece is sleeved on the outer side of the connecting piece; the driving part is fixedly connected with the moving part, the driving part moves along the axial direction of the connecting part to drive the moving part to move along the axial direction of the connecting part, so that the clamping parts are switched between a clamping position where the clamping parts are close to each other and an opening position where the clamping parts are far away from each other, the moving part compresses a first surface of a first end of each clamping part, the opening position compresses a second surface of a second end of each clamping part, and an included angle is formed between the first surface and the second surface. The connecting device provided by the invention can be used for dismounting the driving shaft and the control rod, and is simple and convenient in dismounting operation and simple in structure.

Description

Connecting device

Technical Field

The invention relates to the technical field of reactor engineering, in particular to a connecting device.

Background

The hydraulic driving technology for nuclear reactor control rods is a built-in control rod driving technology, the driving mechanism is arranged in the high-temperature, high-pressure and irradiation environment in a reactor pressure container, and the lifting, transferring and clamping three hydraulic cylinders are adopted to drive the transferring and clamping two sets of control rod assemblies to move in sequence, so that the functions of lifting, descending and dropping the control rod assemblies are realized.

Based on the working principle of a driving mechanism and the structural characteristics of the control rod of the advanced small water reactor with the thermal power of 50-300MW, the connection mode of the control rod and the driving shaft is needed, which is an obstacle to the further development of the nuclear reactor technology. How to connect the control rod and the driving shaft to realize the engineering application of the control rod built-in hydraulic driving technology on the advanced small water reactor with the thermal power of 50-300MW is a problem to be solved urgently.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a connecting device which can be used for disassembling and assembling the driving shaft and the control rod, and has simple and convenient disassembling and assembling operation and simple structure.

A connecting device according to an embodiment of the present invention includes:

a connecting piece which is rotationally connected with a plurality of clamping pieces,

the moving piece is sleeved on the outer side of the connecting piece;

the driving part is fixedly connected with the moving part and moves along the axial direction of the connecting part so as to drive the moving part to move along the axial direction of the connecting part, so that the clamping parts are switched between a clamping position where the clamping parts are close to each other and an opening position where the clamping parts are far away from each other, the moving part compresses a first surface of a first end of each clamping part, the opening position compresses a second surface of a second end of each clamping part, and an included angle is formed between the first surface and the second surface.

According to an embodiment of the invention, the clamping device further comprises a restoring piece, two ends of the restoring piece are respectively connected with the driving piece and a fixing piece sleeved outside the driving piece, and the restoring piece is used for driving the driving piece to move so as to enable the clamping piece to restore from the opening position to the clamping position.

According to an embodiment of the present invention, the fixed member is fixedly connected to the connecting member, the fixed member is provided with a first sliding groove extending along an axial direction of the connecting member, and the moving member is fixedly connected to the driving member by a fastening member penetrating through the first sliding groove.

According to one embodiment of the invention, the driving member comprises a shaft rod and a limiting sleeve sleeved outside the shaft rod, the restoring member is sleeved outside the shaft rod, one end of the restoring member abuts against the limiting sleeve, and the limiting sleeve is connected with the fastening member.

According to one embodiment of the invention, the connecting piece comprises a plurality of positioning parts which are sleeved on the outer side of the workpiece to be clamped, and the end parts of the plurality of positioning parts are provided with guide surfaces for guiding the workpiece to be clamped to be inserted into the connecting piece.

According to an embodiment of the present invention, a protrusion is provided on an outer side of the positioning portion, and the moving member abuts against the protrusion in the clamping position.

According to one embodiment of the invention, the connecting piece comprises a limiting part for limiting the axial position of the workpiece to be clamped, the limiting part is connected to the inner side of the positioning part, and the workpiece to be clamped abuts against the limiting part so that the clamping piece clamps the workpiece to be clamped.

According to one embodiment of the invention, the guide surfaces are provided as arcuate surfaces to form the ends of the connecting members into an open configuration.

According to one embodiment of the invention, the clamping piece is arranged between the two positioning parts, and two ends of the clamping piece are respectively connected with the positioning parts on one side in a rotating manner.

According to one embodiment of the invention, the moving member is provided with a second sliding groove, and the first surface is switched between a state of being positioned in the second sliding groove and a state of being pressed by the moving member.

One or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:

the connecting device provided by the embodiment of the invention comprises a connecting piece, a moving piece, a driving piece and a clamping piece, wherein the clamping piece is rotatably connected to the connecting piece, the connecting piece is kept in a relatively fixed state, the driving piece and the moving piece are fixed, the moving piece is driven to move along the axial direction of the connecting piece through the axial movement of the driving piece along the connecting piece, the moving piece can enable the clamping piece to be switched between a clamping position and an opening position in the process of moving along the axial direction of the connecting piece, the clamping piece is in the clamping position, the fixing of the connecting device and a workpiece to be clamped can be realized, and the clamping piece is in the opening position, so that the connecting device can be disconnected from the workpiece to be clamped; when the workpiece to be clamped is the control rod, the connecting device is connected to the driving shaft, the control rod and the driving shaft in the driving mechanism of the reactor can be disassembled and assembled, the requirements of long-distance butt joint and long-distance disassembly and assembly of the control rod and the driving shaft in the reactor refueling state are met, and technical support is provided for reactor refueling 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 embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic structural diagram illustrating the connection relationship between a connecting device and a drive shaft and a control rod according to an embodiment of the present invention; the clamping member is shown in a clamping position;

FIG. 2 is a schematic cross-sectional view of a connection device according to an embodiment of the present invention; the clamps are shown in an open position;

FIG. 3 is a schematic cross-sectional view of a connection device according to an embodiment of the present invention; the clamps are shown in an open position;

FIG. 4 is a schematic perspective view of a connection device according to an embodiment of the present invention; the clamps are shown in an open position;

FIG. 5 is a schematic diagram of an external structure of a connecting device according to an embodiment of the present invention; the clamp is shown in a clamping position;

FIG. 6 is a schematic view of a connecting member of the connecting device according to an embodiment of the present invention from an oblique lower perspective;

FIG. 7 is a schematic diagram of a connecting member of the connecting device according to the embodiment of the present invention;

FIG. 8 is a schematic view of a fixing member of the connecting device according to the embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a moving part of the connecting device according to the embodiment of the present invention;

FIG. 10 is a schematic view of a clamp of the connector according to an embodiment of the present invention;

FIG. 11 is a schematic view of a clamping member of the connection device according to the embodiment of the present invention; the difference from fig. 10 is in the viewing angle;

FIG. 12 is a schematic view of a partial configuration of a control rod to which the linking device of the present invention is adapted to be coupled;

reference numerals:

1: a connecting member; 11: a positioning part; 111: a guide surface; 12: a limiting part; 13: a projection; 14: rotating the connecting piece; 15: a first mounting hole;

2: a clamping member; 21: a first end; 211: a first surface; 22: a second end; 221: a second surface; 23: a second mounting hole; 24: a clamping part;

3: a drive member; 31: a shaft lever; 32: a position limiting sleeve;

4: a moving member; 41: a second chute; 42: a fastener;

5: a recovery member;

6: a fixing member; 61: a first chute;

7: a control rod; 71: a connecting shaft; 711: a groove;

8: a drive shaft; 81: a shaft core; 82: an outer shaft.

Detailed Description

The embodiments of the present invention will be described in further detail with reference to the 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 "central", "longitudinal", "lateral", "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 used for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, 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 the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection, unless explicitly stated or limited otherwise; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.

In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. 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 12, provides a connecting device, including: the clamping device comprises a connecting piece 1, a moving piece 4 and a driving piece 3, wherein the connecting piece 1 is rotatably connected with a plurality of clamping pieces 2, and the moving piece 4 is sleeved on the outer side of the connecting piece 1; driving piece 3 fixed connection moving member 4, driving piece 3 is along the axial displacement of connecting piece 1 to drive moving member 4 along the axial displacement of connecting piece 1, make a plurality of holders 2 switch between the clamping position that draws close to each other and the open position of keeping away from each other, at the clamping position, moving member 4 compresses tightly the first surface 211 of the first end 21 of holder 2, at the open position, moving member 4 compresses tightly the second surface 221 of the second end 22 of holder 2, first surface 211 forms the contained angle with second surface 221.

When waiting to centre gripping work piece needs the centre gripping, under the driving power effect of driving piece 3, moving member 4 is along the axial displacement of connecting piece 1 to make holder 2 be in the open position, at this moment, will wait that the centre gripping work piece inserts between a plurality of holders 2, adjust holder 2 from the open position to the clamping position again, make holder 2 draw in under the cup joint pressure of moving member 4 in order to wait to centre gripping work piece spacing between a plurality of holders 2, wait that the centre gripping work piece is spacing fixed by a plurality of holders 2, realize waiting to be connected of centre gripping work piece and connecting device.

When the connecting device of the embodiment is not used, the plurality of clamping pieces 2 can be adjusted to the clamping position, and the moving piece 4 can play a role in protecting the clamping pieces 2; however, the state of the clamp 2 is not limited to the clamped position, and may be selected as needed, or may be an opened position. Wherein, the switching of holder 2 between clamping position and open position is realized through the relative motion of moving member 4 and connecting piece 1, at this moment, can be fixed with connecting piece 1, and driving piece 3 drives moving member 4 along the axial displacement of connecting piece 1, and the structure is nimble and adjust portably.

The first surface 211 and the second surface 221 form an acute included angle, and the first surface 211 and the second surface 221 are sleeved on the moving member 4 to perform an external force action, so that the clamping member 2 rotates and is adjusted, and the clamping member 2 is switched between the clamping position and the opening position. The angles of the first surface 211 and the second surface 221 at two ends of the clamping piece 2 are different, in order to enable the moving piece 4 to be attached to the outer side of the first surface 211, the clamping piece 2 enables the first surface 211 to be attached to the inner wall of the moving piece 4 through rotating relative to the connecting piece 1, and the clamping piece 2 is switched between a clamping position and an opening position through the rotating process of the clamping piece 2; similarly, in order to make the moving member 4 fit outside the second surface 221, the clamping member 2 also rotates relative to the connecting member 1, and the process of rotating the clamping member 2 causes the clamping member 2 to switch between the clamping position and the open position.

The connecting device of the embodiment can be applied to various workpieces to be clamped, and the size and the shape of the clamping piece 2 can be designed according to the size and the shape of the workpieces to be clamped so as to meet the clamping connection of the workpieces to be clamped. When the workpiece to be clamped is a connecting shaft of a control rod, the connecting device may be used to connect the drive shaft with the control rod.

The following describes the present embodiment in detail, taking as an example the application of the connecting device of the present embodiment to the connection between the control rod 7 and the drive shaft 8 in a nuclear reactor.

When the workpiece to be clamped is the control rod 7, the end of the control rod 7 is provided with the connecting shaft 71, the connecting shaft 71 is provided with a groove 711, and the clamping piece 2 is provided with the clamping part 24 matched with the groove 711. The connecting device of the present embodiment is fixed to the drive shaft 8, and the connecting device realizes the attachment and detachment of the drive shaft 8 and the control rod 7 by clamping the connecting shaft 71 by the clamp 2 and releasing the connecting shaft 71 by the clamp 2. The grippers 2 are adjusted to the open position (i.e., as shown in fig. 2 to 3, the driving shaft 8 is pulled up to pull the moving member 4 up with respect to the connecting member 1), the grippers 2 are opened to insert the connecting shaft 71 between the plurality of grippers 2, and then the moving member 4 is adjusted to the gripping position (i.e., as shown in fig. 3 to 2, the driving member 3 is pushed down to push the moving member 4 down) to cause the grippers 2 to grip the connecting shaft 71, thereby fixing the control rods 7 to the driving shaft 8.

Based on the working principle of a driving mechanism and the structural characteristics of the control rod of the advanced small water reactor with the thermal power of 50-300MW, the requirement that the control rod 7 and the driving shaft 8 can be separated is met, so that the requirements of large-size processing and transportation are met; meanwhile, the connecting device enables the control rod 7 and the driving shaft 8 to be firmly connected, meets the requirements of remote butt joint and remote disassembly and assembly of the control rod 7 and the driving shaft 8 in the reactor refueling state, and provides technical support for reactor refueling operation.

The connecting device of the embodiment realizes the detachable connection of the control rod 7 and the driving shaft 8, realizes engineering and productization, ensures the engineering application of the control rod built-in hydraulic drive technology, is one of the series engineering implementation technologies of the control rod built-in drive technology, mainly meets the engineering application of the control rod built-in hydraulic drive technology, and provides a choice for the engineering design of remote detachable connection structures in other industrial fields. Wherein, referring to fig. 12, the control rods 7 may be cross wing control rods.

In one embodiment, referring to fig. 1, the connecting device further includes a restoring member 5, two ends of the restoring member 5 are respectively connected to the driving member 3 and a fixing member 6 sleeved outside the driving member 3, and the restoring member 5 is used for driving the driving member 3 to move so as to restore the clamping member 2 from the open position to the clamping position. The restoring member 5 is used for driving the moving member 4 to move so that the clamping member 2 can restore to the clamping position. When the clamping member 2 needs to be switched from the clamping position to the opening position, the moving member 4 is driven to move by the axial movement of the driving member 3, and the moving power of the driving member 3 can be provided by external force.

Wherein, the return element 5 can be an elastic element, such as a spring, an elastic air bag, etc.

In one embodiment, referring to fig. 1, the driving member 3 includes a shaft 31 and a position-limiting sleeve 32 sleeved outside the shaft 31, the restoring member 5 is sleeved outside the shaft 31, one end of the restoring member 5 abuts against the position-limiting sleeve 32, the other end of the restoring member 5 is fixed to the fixing member 6 or the outer shaft 82 of the driving shaft 8, and the position-limiting sleeve 32 is connected with the fastening member 42. The connection mode of the moving part 4 and the driving part 3 is simple and convenient, and the stress of the mode of sleeving the return part 5 is more balanced and stable.

The shaft 31 is fixedly connected to the shaft core 81 of the driving shaft 8 or is integrally formed with the shaft core 81 of the driving shaft 8. Stop collar 32 cover is established in the outside of axostylus axostyle 31 for connecting fastener 42, fastener 42 run through first spout 61 and connect stop collar 32 and moving member 4, in order to realize the fixed connection of moving member 4 and driving piece 3, simple structure, and processing is simple and convenient. Wherein the fastener 42 and the moving member 4 are prevented from loosening by spot welding. The shaft rod 31 is fixed with the shaft core 81 in the driving shaft 8, and the axial positioning of the shaft rod 31 is realized by the fixing mode of the shaft core 81, so that the mutual locking of the limiting sleeve 32 and the moving piece 4 is realized.

In one embodiment, the fixed member 6 is fixedly connected to the connecting member 1, the fixed member 6 is provided with a first sliding slot 61 extending along the axial direction of the connecting member 1, and the moving member 4 is fixedly connected with the driving member 3 by a fastening member 42 penetrating through the first sliding slot 61. The first sliding groove 61 is arranged to facilitate the connection of the moving member 4 and the driving member 3. The fixing piece 6 and the connecting piece 1 can be connected in a threaded connection mode, a clamping connection mode and the like, and the connecting mode is various and can be selected according to needs.

Wherein the fixing element 6 is fixedly connected to the outer shaft 82 of the drive shaft 8, or the fixing element 6 is part of the outer shaft 82 of the drive shaft 8. The fixed piece 6 is fastened with the outer shaft 82 through a pin, circumferential limiting is carried out, and the pin and the outer shaft 82 are prevented from being loosened through spot welding.

The first sliding groove 61 is matched with the fastening piece 42 to guide the relative movement of the fixed piece 6 and the moving piece 4, so that the stability of the relative movement of the fixed piece 6 and the moving piece 4 is ensured, the structure is simple, and the installation is simple and convenient. One or more first sliding grooves 61 are provided on the fixing member 6, and the number of the first sliding grooves 61 can be selected as required.

In the open position, the fastening member 42 is positioned at a first end of the first sliding groove 61, and in the clamping position, the fastening member 42 is positioned at a second end of the first sliding groove 61 to ensure relative fixation of the fixed member 6 and the moving member 4. The first runner 61 determines the relative displacement and mutual positioning position of the fixed member 6 and the moving member 4.

The fastening member 42 may be a screw, a pin, or the like penetrating through the connection hole to fix the moving member 4 to the driving member 3, and the fixed member 6 and the moving member 4 may be kept fixed by the restoring force of the restoring member 5 at the clamping position.

In one embodiment, referring to fig. 1 to 5, the connecting element 1 includes a plurality of positioning portions 11 for being sleeved on the outer side of the workpiece to be clamped, and ends of the plurality of positioning portions 11 are provided with guide surfaces 111 for guiding the workpiece to be clamped to be inserted into the connecting element 1. The positioning part 11 is used for limiting and positioning the workpiece to be clamped, so that the workpiece to be clamped is accurately positioned in the connecting piece 1, and the guide surface 111 can guide the workpiece to be clamped to be quickly and accurately inserted into the connecting piece 1.

In one embodiment, as shown in fig. 4, 6 and 7, the guide surface 111 is provided as an arc surface to form an open structure at the end of the link 1, and the guide effect is good and the structure is simple.

Wherein the arc surface is a spherical surface, the guiding effect of the spherical surface is good, and the contact resistance is reduced. The number of the positioning parts 11 is the same as that of the clamping members 2, and the number of the positioning parts 11 is the same as that of the connecting member 1. The positioning parts 11 are uniformly arranged in four directions along the circumferential direction of the connecting piece 1, and the guide surfaces 111 are arranged to enable the end parts of the positioning parts 11 to form an inner-ball outer-cone structure, so as to facilitate the long-distance butt joint of the driving shaft 8 and the control rod 7.

Of course, the guiding surface 111 is not limited to be an arc surface, but may also be an inclined plane, and the end of the connecting member is formed into an open structure to play a guiding role.

In one embodiment, referring to fig. 1, 5 to 7, the outer side of the positioning portion 11 is provided on the protruding portion 13, and in the clamping position, the moving member 4 abuts against the protruding portion 13. The convex part 13 limits and positions the sleeve of the moving part 4, and ensures that the moving part 4 accurately corresponds to the second surface 221 of the second end 22 of the clamping part 2, so that the moving part 4 is accurately sleeved on the outer side of the second surface 221, and meanwhile, the convex part 13 also plays a role in supporting the moving part 4.

The protruding portion 13 in this embodiment, together with the first sliding groove 61 in the above-described embodiment and the second sliding groove 41 in the following embodiments, has a dual function of limiting and positioning the moving member 4, so that the position of the moving member 4 is more stable.

In one embodiment, referring to fig. 1 to 3, 6 and 7, the connecting member 1 includes a limiting portion 12 for limiting an axial position of the workpiece to be clamped, the limiting portion 12 is connected to an inner side of the positioning portion 11, and the workpiece to be clamped abuts against the limiting portion 12, so that the clamping member 2 clamps the workpiece to be clamped. When treating in the clamping workpiece inserts connecting piece 1, spacing portion 12 treats the high position of clamping workpiece and restricts to the recess 711 of treating the clamping workpiece corresponds with the joint portion 24 accuracy on the holder 2, reduces the joint deviation of holder 2, promotes the centre gripping accuracy of holder 2.

The limiting portion 12 is a block structure inside the connecting member 1, and the top surface of the workpiece to be clamped abuts against the lower surface of the limiting portion 12.

In one embodiment, referring to fig. 4, 6 and 7, the clamping member 2 is disposed between two positioning portions 11, and both ends of the clamping member 2 are rotatably connected to the positioning portions 11 on one side thereof, respectively. The clamping piece 2 is matched with the positioning part 11, and meanwhile, the clamping workpiece is circumferentially limited, and the clamping piece 2 is convenient to mount.

The clamping piece 2 is provided with a first mounting hole 15, the clamping piece 2 is provided with a second mounting hole 23, the first mounting hole 15 and the second mounting hole 23 are connected with a rotating connecting piece 14 in a penetrating manner, the rotating connecting piece 14 is fixed in the first mounting hole 15, and the clamping piece 2 is rotatably connected with the rotating connecting piece 14; or the rotating connecting piece 14 is rotatably connected with the first mounting hole, the clamping piece is fixed on the rotating connecting piece, and the connection mode can be selected according to the requirement. Wherein, the first mounting hole 15 is provided on the positioning portion 11.

In one embodiment, referring to fig. 1 to 5 and 9, the moving member 4 is provided with a second sliding groove 41, and the first surface 211 is switched between a state of being located in the second sliding groove 41 and a state of being pressed by the moving member 4. The first surface 211 of the gripper 2 moves to the surface abutting the lower end of the moving member 4, the gripper 2 is located at the open position, the first surface 211 of the gripper 2 moves to the upper end of the second runner 41, and at this time, the second surface 221 of the gripper 2 moves to the surface abutting the lower end of the moving member 4, and the gripper 2 is located at the gripping position. The first end 21 of the clamping member 2 slides in the second sliding groove 41, which helps to reduce the friction between the clamping member 2 and the moving member 4 and improves the moving flexibility of the clamping member 2.

The second slide grooves 41 are provided in plurality in the circumferential direction of the moving member 4, and the number of the second slide grooves 41 is the same as the number of the grippers 2. Four positioning parts 11 are arranged on the connecting piece 1, four clamping pieces 2 are arranged on the connecting piece 1, and four second sliding grooves 41 are arranged.

In one embodiment, referring to fig. 1 to 5 and 10 to 12, the clamping portion 24 of the clamping member 2 is provided with two protrusions, and two grooves 711 matched with the protrusions are axially formed on the connecting shaft 71, so that the clamping member 2 and the connecting shaft 71 are clamped and fixed in two stages, and the clamping member 2 and the connecting shaft 71 can be accurately clamped and fixed in place without the problem of half-clamping.

Of course, other workpieces to be clamped may also have two grooves 711 arranged along the axial direction, and the grooves 711 may be annular or a plurality of grooves may be arranged in the circumferential direction of the workpieces to be clamped.

The above embodiments are merely illustrative of the present invention and are not to be construed as limiting the 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 equivalents 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 the technical solution of the present invention is covered by the claims of the present invention.

Claims

1. A connection device, comprising:

the moving piece is sleeved on the outer side of the connecting piece;

the driving part is fixedly connected with the moving part and moves along the axial direction of the connecting part so as to drive the moving part to move along the axial direction of the connecting part, so that the clamping parts are switched between a clamping position and an opening position, wherein the clamping positions are close to each other, the moving part compresses a first surface of a first end of each clamping part at the clamping position, the opening position is used for compressing a second surface of a second end of each clamping part at the opening position, and an included angle is formed between the first surface and the second surface;

the fixing piece is fixedly connected with the connecting piece, the fixing piece is provided with a first sliding groove extending along the axial direction of the connecting piece, and the moving piece is fixedly connected with the driving piece through a fastening piece penetrating through the first sliding groove.

2. The connecting device according to claim 1, further comprising a restoring member, wherein two ends of the restoring member are respectively connected to the driving member and a fixing member sleeved outside the driving member, and the restoring member is configured to drive the driving member to move so as to restore the clamping member from the open position to the clamping position.

3. The connecting device as claimed in claim 2, wherein the driving member includes a shaft and a stop collar sleeved on an outer side of the shaft, the restoring member is sleeved on the outer side of the shaft, one end of the restoring member abuts against the stop collar, and the stop collar is connected with the fastening member.

4. The connecting device according to any one of claims 1 to 3, wherein the connecting member includes a plurality of positioning portions for fitting to an outer side of the workpiece to be clamped, and ends of the plurality of positioning portions are provided with guide surfaces for guiding the insertion of the workpiece to be clamped into the connecting member.

5. The connecting device according to claim 4, wherein a protrusion is provided on an outer side of the positioning portion, and the moving member is retained by the protrusion in the clamping position.

6. The connecting device according to claim 4, wherein the connecting member includes a limiting portion for limiting an axial position of the workpiece to be clamped, the limiting portion is connected to an inner side of the positioning portion, and the workpiece to be clamped abuts against the limiting portion, so that the clamping member clamps the workpiece to be clamped.

7. A connection device according to claim 4, wherein the guide surfaces are provided as arcuate surfaces to form an open configuration at the ends of the connection member.

8. The connecting device according to claim 4, wherein the clamping member is disposed between the two positioning portions, and both sides of the clamping member are rotatably connected to the positioning portions on one side thereof, respectively.

9. A connecting device according to any one of claims 1 to 3, wherein a second sliding groove is provided on the moving member, and the first surface is switched between a state of being located in the second sliding groove and a state of being pressed by the moving member.