CN211218525U

CN211218525U - Power riveting tool accessory for fixing side handle

Info

Publication number: CN211218525U
Application number: CN201921691432.6U
Authority: CN
Inventors: 郭勇; 刘锋力; 姚翔腾; 余超; 杨凌; 刘勇; 陆建辉; 李颖; 郎金权; 何大运
Original assignee: Hangzhou Lianwei Technology Co ltd
Current assignee: Hangzhou Lianwei Technology Co ltd
Priority date: 2019-10-10
Filing date: 2019-10-10
Publication date: 2020-08-11
Anticipated expiration: 2029-10-10

Abstract

The utility model belongs to the technical field of machinery, a fixed side is power riveting tool annex is related to. The technical problems that the acting point is difficult to find and the holding is inconvenient in the prior art are solved. The electric wrench comprises a cylindrical handle, a rotating part and a transmission part, wherein the rotating part is connected with the cylindrical handle in an axial positioning and circumferential rotating manner, the transmission part is connected with the cylindrical handle in a circumferential positioning and axial movable manner, and the rotating part is connected with the transmission part through a threaded structure. Compared with the prior art, the utility model has the advantages of reasonable in design, more laborsaving, be convenient for put forth effort, it is more laborsaving when carrying out the riveting tool.

Description

Power riveting tool accessory for fixing side handle

Technical Field

The utility model belongs to the technical field of machinery, especially, relate to a fixed side is power riveting tool annex.

Background

The rivet is a common riveting fastener, is widely applied to the industries of aerospace, war industry, automobiles, ships, construction, installation, production and manufacture and the like with riveting and fastening requirements, has very wide civil application, and has huge annual demand on various rivet nut tool products in related industries and domestic and foreign civil markets. The main development directions of the pull rivet nut and pull rivet tool products are cost performance, precision, convenience, high efficiency, labor saving and the like.

In order to overcome the defects of labor waste, heaviness, low precision, low efficiency and the like of a manual rivet pulling tool, an integral pneumatic riveting tool is developed and popularized. The pneumatic riveting tool is mainly popularized and applied in the industrial market, and the market expansion of the pneumatic riveting tool product is limited due to the limitation of a compressed air source, high price and the like. The integral electric tool has attracted wide market attention recently due to the portability, the convenience of power sources and the like, but the integral electric tool is few products which can be selected in domestic and foreign markets, and is mainly aimed at some industrial markets due to the complex products and high unit price.

In recent years, a riveting tool is changed into a power tool accessory, functions of an integral electric riveting tool and a pneumatic riveting tool are realized functionally by means of power output of a power tool matched with the riveting tool accessory, and the power tool is a general tool such as an electric drill and the like, so that the riveting power tool accessory and the riveting tool are a valuable, meaningful and market potential development direction in the riveting tool industry. Although the riveting tool is more labor-saving than a manual riveting tool, the resistance in the riveting process is large due to the limitation of a mechanical structure, and the holding force point of the riveting tool is difficult to control.

In view of this problem, research and study have been conducted in long-term production and life practices, and for example, chinese patent application discloses a riveting tool accessory and a riveting tool [ application No.: CN201720199551.4], the invention includes a cylindrical handle, a rotating member axially positioned and connected to the cylindrical handle in a circumferential rotation manner and a transmission member axially movably connected to the cylindrical handle in a circumferential positioning manner, the rotating member and the transmission member can be connected by a screw structure, and the transmission member can be driven to retreat or advance when the rotating member rotates forward or backward, the front end of the transmission member is provided with a connecting member, the front end of which can be loaded with a rivet nut, the front end of the cylindrical handle is provided with a nozzle assembly, the connecting member is inserted into the nozzle assembly and the front end of the connecting member can extend out of the nozzle assembly, a compression pre-tightening spring is arranged between the transmission member and the nozzle assembly, and a safety valve mechanism is arranged between the transmission member and the connecting member.

The solution described above improves to some extent some of the problems of the prior art, but it also has at least the following drawbacks: the holding is difficult to find the force application point and inconvenient to hold.

Disclosure of Invention

The utility model aims at the above-mentioned problem, provide a fixed side is power riveting tool annex convenient to operation of gripping.

In order to achieve the above purpose, the utility model adopts the following technical proposal: the fixed side handle power riveting tool accessory comprises a cylindrical handle, wherein a rotating piece axially positioned and connected with the cylindrical handle in a circumferential rotating mode and a transmission piece circumferentially positioned and movably connected with the cylindrical handle in an axial direction are arranged in the cylindrical handle in a penetrating mode, the rotating piece is connected with the transmission piece through a threaded structure, the transmission piece can be driven to retreat or advance when the rotating piece rotates forwards or reversely, a plurality of claw bodies distributed in the circumferential direction and a limiting structure capable of preventing the claw bodies from being separated are arranged at the front end of the transmission piece, a cylindrical guide nozzle capable of enabling the front end of each claw body to be abutted to the rear end of the cylindrical guide nozzle is arranged at the front end of the cylindrical handle, a claw body ejection column capable of pushing the transmission piece to move forwards axially when the rotating piece rotates reversely so that each claw body can be radially separated under the cooperation of the cylindrical guide nozzle, and the transmission piece can be driven to move backwards axially so that each claw body can be radially folded to drive the folded claw body to continue to move backwards in an axial direction The cylindrical handle is fixedly provided with a side handle, and the side handle is detachably and fixedly connected with the cylindrical handle; or the side handle and the cylindrical handle are connected into a whole.

In the above-mentioned fixed side handle power riveting tool accessory, the side handle includes an annular positioning sleeve fixed on the periphery of the tubular handle, the annular positioning sleeve is fixedly connected with the tubular handle, and a side handle body is fixedly arranged on the annular positioning sleeve.

In the fixed side handle power riveting tool accessory, the side part of the cylindrical handle is provided with a stop blind hole, the annular positioning sleeve is provided with a through hole corresponding to the stop blind hole, and the inner end of the side handle body sequentially penetrates through the through hole and the stop blind hole and is fixed on the annular positioning sleeve through at least one fastener.

In foretell fixed side power riveting tool annex, the side be the body including spliced pole and outer be the body, the inner of spliced pole insert in ending the position blind hole, the outer end of spliced pole be located the through-hole center, the one end of the outer be the body be equipped with the jack, the outer be the body be equipped with the one end of jack insert in the through-hole and the outer end of spliced pole insert in the jack, the outer be the body be equipped with the one end of jack and link firmly through at least one fastener with annular position sleeve.

In the fixed side handle power riveting tool accessory, at least one first positioning hole is formed in the side part of the annular positioning sleeve, at least one second positioning hole corresponding to the first positioning hole is formed in the connecting column, the inner end of the fastener penetrates through the first positioning hole, the inner end of the fastener is located in the second positioning hole, and the outer end of the fastener is sunk into the first positioning hole;

or, the side part of the annular positioning sleeve is provided with first positioning holes which are symmetrically arranged, the connecting column is provided with second positioning holes which are transversely communicated, the second positioning holes respectively correspond to one first positioning hole, positioning pins are arranged in the second positioning holes in a penetrating mode, and two ends of each positioning pin respectively extend into the two first positioning holes.

In the fixed side handle power riveting tool accessory, the middle part of the cylindrical handle is provided with a convex ring, the stop blind hole is arranged at the convex ring, the annular positioning sleeve is sleeved at the periphery of the convex ring, one end of the annular positioning sleeve is provided with a turning edge, and the turning edge is buckled at one side of the convex ring.

In foretell fixed side power riveting tool annex, the driving medium outer wall be equipped with at least one spacing guide slot along driving medium axial extension, the tube-shape hand (hold) lateral part wear to be equipped with at least a spacer pin, spacer pin and spacing guide slot one-to-one set up and the inner of spacer pin is located spacing guide slot, the axis of spacer pin all be located the same cross section of tube-shape hand (hold), the axis of side handle and the axis coplane of spacer pin.

In the above-mentioned fixed side power riveting tool accessory, the spacing guide slot have two and the symmetry sets up, the spacer pin have two and the symmetry sets up, the axis of side handle and the axis mutually perpendicular setting of spacer pin.

In the fixed side handle power riveting tool accessory, the cylindrical guide nozzle is arranged on a front outer sleeve, the front outer sleeve is detachably fixed at the front end of the cylindrical handle, and a locking ring abutting against the end face of the front end of the cylindrical handle is detachably connected to the front outer sleeve; and a safety valve mechanism which can enable the threaded structure to have screw pair pre-tightening force is arranged between the claw body ejection column and the transmission part, and the safety valve mechanism can enable the screw pair conversion of the threaded structure to be realized before the axial reaction force between the front end of each claw body and the rear end of the cylindrical guide nozzle is reduced to zero in the process of forward rotation of the rotating part, so that the idle return stroke of the threaded structure is avoided.

In the fixed side handle power riveting tool accessory, the rotating part is a screw rod, the transmission part is a cylinder, and the front end of the screw rod and the rear end of the cylinder can be connected through the thread structure; the safety valve mechanism comprises a valve core arranged in the cylinder and capable of being plugged in the middle of the cylinder and a spring arranged between the valve core and a claw body ejection column, one end of the spring acts on the claw body ejection column, the other end of the spring acts on the valve core, and a valve cavity capable of changing volume along with the axial relative position of the screw rod and the cylinder so as to change the internal pressure is formed among the screw rod, the cylinder and the valve core.

Compared with the prior art, the fixed side is power riveting tool accessories's advantage lies in: simple structure, reasonable in design is being riveted the during operation, can let the hand grip through the side body, is convenient for put forth effort, and is more laborsaving when carrying out riveting tool.

Drawings

FIG. 1 is a cross-sectional view of the structure provided by the present invention;

fig. 2 is a structural sectional view of the other side provided by the present invention;

fig. 3 is a structural sectional view of the expanded claw body provided by the present invention;

in the figure, a cylindrical handle 1, a limiting structure 1a, a rotating part 2, a transmission part 3, a thread structure 4, a claw body 5, a cylindrical guide nozzle 6, a side handle 7, an annular positioning sleeve 8, a side handle body 9, a stop blind hole 10, a through hole 11, a fastening piece 12, a connecting column 13, an outer handle body 14, an inserting hole 15, a convex ring 18, a turned edge 19, a limiting guide groove 20, a limiting pin 21, a front outer sleeve 22, a locking ring 23, a claw body top column 24, a safety valve mechanism 25, a spring 26, a valve core 27 and a valve cavity 28.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in figures 1-3, the power riveting tool accessory with the fixed side handle comprises a cylindrical handle 1, a rotating part 2 axially positioned and connected with the cylindrical handle 1 in a circumferential rotating manner and a transmission part 3 axially positioned and movably connected with the cylindrical handle 1 are arranged in the cylindrical handle 1 in a penetrating manner, the rotating part 2 is connected with the transmission part 3 through a thread structure 4, the transmission part 3 can be driven to retreat or advance when the rotating part 2 rotates forwards or reversely, a plurality of claw bodies 5 distributed in the circumferential direction and a limiting structure capable of preventing each claw body 5 from being separated are arranged at the front end of the transmission part 3, a cylindrical guide mouth 6 capable of enabling the front end of each claw body 5 to be propped against the rear end of each claw body 5 is arranged at the front end of the cylindrical handle 1, a claw body propping column 24 capable of pushing the transmission part 3 to move forwards in the axial direction when the rotating part 2 rotates backwards and enabling each claw body 5 to be radially separated under the matching of the cylindrical guide mouth 6 is arranged, when the rotating piece 2 rotates forwards, the driving piece 3 can be driven to move axially backwards, so that the claw bodies 5 are radially folded, the folded claw bodies 5 are driven to continue to move axially backwards, the cylindrical handle 1 is fixedly provided with the side handle 7, and the side handle 7 is detachably and fixedly connected with the cylindrical handle 1; or the side handle 7 is connected with the cylindrical handle 1 into a whole. Through set up the position that the side handle 7 can provide a borrow power for the hand when carrying out the rivet work at tube-shape hand (hold) 1 lateral part, can realize outside power balance, can be more laborsaving at the rivet in-process.

Preferably, the side handle 7 comprises an annular positioning sleeve 8 fixed on the periphery of the cylindrical handle 1, the annular positioning sleeve 8 is fixedly connected with the cylindrical handle 1, a side handle body 9 is fixedly arranged on the annular positioning sleeve 8, the side handle 7 is designed into the annular positioning sleeve 8 and the side handle body 9 which are in a split combined type, the disassembly and the assembly are convenient, the operation is simple, and a hand is held on the side handle body 9 during the operation.

Furthermore, the side part of the cylindrical handle 1 is provided with a stop blind hole 10, the annular positioning sleeve 8 is provided with a through hole 11 corresponding to the stop blind hole 10, the inner end of the side handle body 9 sequentially penetrates through the through hole 11 and the stop blind hole 10 and is fixed on the annular positioning sleeve 8 through at least one fastener 12, the side handle body 9 comprises a connecting column 13 and an outer handle body 14, the inner end of the connecting column 13 is inserted into the stop blind hole 10, the outer end of the connecting column 13 is positioned in the center of the through hole 11, one end of the outer handle body 14 is provided with a jack 15, one end of the outer handle body 14 provided with the jack 15 is inserted into the through hole 11, the outer end of the connecting column 13 is inserted into the jack 15, one end of the outer handle body 14 provided with the jack 15 is fixedly connected with the annular positioning sleeve 8 through at least one fastener 12, the connecting column 13 sequentially penetrates through the through hole and the stop blind hole so as to, the fastening element 12 here can improve the reliability of the connecting column 13 when locked.

The side part of the annular positioning sleeve 8 is provided with at least one first positioning hole, the connecting column 13 is provided with at least one second positioning hole corresponding to the first positioning hole, the inner end of the fastener 12 penetrates through the first positioning hole, the inner end of the fastener is positioned in the second positioning hole, and the outer end of the fastener 12 sinks into the first positioning hole; or, the side part of the annular positioning sleeve 8 is provided with first positioning holes which are symmetrically arranged, the connecting column 13 is provided with second positioning holes which are transversely communicated, the second positioning holes respectively correspond to one first positioning hole, a positioning pin is arranged in each second positioning hole in a penetrating mode, and two ends of each positioning pin respectively extend into the two first positioning holes. The middle of the cylindrical handle 1 is provided with a convex ring 18, the stop blind hole 10 is arranged at the convex ring 18, the annular positioning sleeve 8 is sleeved at the periphery of the convex ring 18, one end of the annular positioning sleeve 8 is provided with a turned edge 19, the turned edge 19 is buckled at one side of the convex ring 18, and the cylindrical handle 1 can be firmly buckled in the annular positioning sleeve 8 through the turned edge 19 and the convex ring 18, so that the connection between the cylindrical handle 1 and the cylindrical handle 1 is more reliable.

Furthermore, the outer wall of the transmission member 3 is provided with at least one limiting guide groove 20 extending along the axial direction of the transmission member 3, at least one limiting pin 21 penetrates through the side portion of the cylindrical handle 1, the limiting pins 21 and the limiting guide grooves 20 are arranged in one-to-one correspondence, the inner ends of the limiting pins 21 are positioned in the limiting guide grooves 20, the central axes of the limiting pins 21 are all positioned on the same cross section of the cylindrical handle 1, the central axis of the side handle 7 is coplanar with the central axis of the limiting pin 21, the limiting guide grooves 20 are arranged in two and symmetrical ways, the two limiting pins 21 are arranged in two and symmetrical ways, the central axis of the side handle 7 is perpendicular to the central axis of the limiting pin 21, the cylindrical handle 1 and the transmission member 3 are fixed at selected positions circumferentially, the limiting pin 21 and the connecting post 13 on the cylindrical handle 1 are fixed at selected positions, and the axial section of the position of the, an in-plane force balance system is formed, internal force is balanced to the maximum degree, force transmitted to the outside is minimized, and therefore the use is easiest, and stability of a transmission system and a mechanism related to a product, stability and efficiency of torque resistance of the side handle 7 are better.

The tubular guide nozzle 6 is arranged on a front outer sleeve 22, the front outer sleeve 22 is detachably fixed at the front end of the tubular handle 1, and a locking ring 23 abutted against the front end face of the tubular handle 1 is detachably connected to the front outer sleeve 22; a safety valve mechanism 25 which can enable the threaded structure 4 to have spiral pair pre-tightening force is arranged between the claw body ejection column 24 and the transmission part 3, the safety valve mechanism 25 can enable the rotary part 2 to realize spiral pair conversion of the threaded structure 4 before axial reaction force between the front end of each claw body 5 and the rear end of the cylindrical guide nozzle 6 is reduced to zero in the positive rotation process, so that the idle-return stroke of the threaded structure 4 is avoided, the cylindrical guide nozzle 6 can be detached, and the cylindrical guide nozzles 6 with different sizes can be replaced according to actual needs to meet the working requirements of rivets with different sizes.

In addition, the rotating part 2 is a screw rod, the transmission part 3 is a cylinder, and the front end of the screw rod and the rear end of the cylinder can be connected through the thread structure 4; the safety valve mechanism 25 comprises a valve core 27 arranged in the cylinder and capable of being plugged in the middle of the cylinder and a spring 26 arranged between the valve core 27 and the claw body top column 24, one end of the spring 26 acts on the claw body top column 24, the other end acts on the valve core 27, and a valve cavity 28 capable of changing volume along with the axial relative position of the screw rod and the cylinder so as to change the internal pressure is formed among the screw rod, the cylinder and the valve core 27. If a circuit system is provided, the medium in the valve cavity 28 may also be other types of medium, and the valve core 27 of the present invention may be a rigid or elastic sphere, a hemisphere or the like, or other structures without pressure outlet structure, such as a cylinder, a sleeve, a flat plate with different concave-convex structure characteristics on the upper surface, or a sleeve or a cylinder.

Before working, when the claw body 5 is in a closed state, the rotating piece 2 is operated to enable the transmission piece 3 to rotate forwards, the claw body 5 is separated, and then the rivet is loaded; after loading, the driving rotating piece 2 is driven to reversely rotate, and the driving rotating piece 2 is continuously driven to rotate until rivet pulling work is finished.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although the terms of the cylindrical handle 1, the limiting structure 1a, the rotating member 2, the transmission member 3, the thread structure 4, the claw body 5, the cylindrical guide mouth 6, the side handle 7, the annular positioning sleeve 8, the side handle body 9, the stop blind hole 10, the through hole 11, the fastening member 12, the connecting column 13, the outer handle body 14, the insertion hole 15, the convex ring 18, the flange 19, the limiting guide groove 20, the limiting pin 21, the front outer sleeve 22, the locking ring 23, the claw body top column 24, the safety valve mechanism 25, the spring 26, the valve core 27, the valve cavity 28 and the like are used more frequently, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.

Claims

1. The utility model provides a fixed side is power riveting tool annex, includes tube-shape hand (1), wears to be equipped with in tube-shape hand (1) and rotates piece (2) and driving medium (3) with tube-shape hand (1) circumferential positioning and axial swing joint that are connected with tube-shape hand (1) axial positioning and circumferential direction, rotate piece (2) and driving medium (3) between link to each other through helicitic texture (4), and can drive driving medium (3) when rotating piece (2) corotation or reversal and retreat or advance, driving medium (3) front end be equipped with a plurality of claw bodies (5) that distribute in the circumferencial direction and can prevent limit structure (1a) that each claw body (5) breaks away from, tube-shape hand (1) front end be equipped with can make each claw body (5) front end top in tube-shape guide mouth (6) of its rear end, driving medium (3) front end and each claw body (5) rear end between be equipped with and can promote driving medium (3) axial forward movement when rotating piece (2) reversal Therefore, each claw body (5) is matched with the cylindrical guide nozzle (6) to form a claw body top column (24) which is separated radially, and when the rotating piece (2) rotates forwards, the driving piece (3) can be driven to move axially backwards, so that each claw body (5) is folded radially and then the folded claw bodies (5) are driven to move axially backwards continuously, the claw type electric wrench is characterized in that a side handle (7) is fixedly arranged on the cylindrical handle (1), and the side handle (7) is detachably and fixedly connected with the cylindrical handle (1); or the side handle (7) and the cylindrical handle (1) are connected into a whole.

2. The fixed side handle power riveting tool accessory according to claim 1, wherein the side handle (7) comprises an annular positioning sleeve (8) fixed on the periphery of the cylindrical handle (1), the annular positioning sleeve (8) is fixedly connected with the cylindrical handle (1), and a side handle body (9) is fixedly arranged on the annular positioning sleeve (8).

3. The fixed side handle power riveting tool accessory according to claim 2, wherein the side of the cylindrical handle (1) is provided with a stop blind hole (10), the annular positioning sleeve (8) is provided with a through hole (11) corresponding to the stop blind hole (10), and the inner end of the side handle body (9) is sequentially arranged through the through hole (11) and the stop blind hole (10) and fixed on the annular positioning sleeve (8) through at least one fastener (12).

4. The fixed side handle power riveting tool accessory of claim 3, wherein the side handle body (9) comprises a connecting column (13) and an outer handle body (14), the inner end of the connecting column (13) is inserted into the stop blind hole (10), the outer end of the connecting column (13) is located in the center of the through hole (11), one end of the outer handle body (14) is provided with a jack (15), one end of the outer handle body (14) provided with the jack (15) is inserted into the through hole (11) and the outer end of the connecting column (13) is inserted into the jack (15), and one end of the outer handle body (14) provided with the jack (15) is fixedly connected with the annular positioning sleeve (8) through at least one fastener (12).

5. The fixed-side-handle power riveting tool accessory according to claim 4, wherein the side of the annular positioning sleeve (8) is provided with at least one first positioning hole, the connecting column (13) is provided with at least one second positioning hole corresponding to the first positioning hole, the inner end of the fastener (12) passes through the first positioning hole and the inner end thereof is positioned in the second positioning hole, and the outer end of the fastener (12) sinks into the first positioning hole;

or, the side part of the annular positioning sleeve (8) is provided with first positioning holes which are symmetrically arranged, the connecting column (13) is provided with second positioning holes which are transversely communicated, the second positioning holes respectively correspond to one first positioning hole, positioning pins are arranged in the second positioning holes in a penetrating mode, and two ends of each positioning pin respectively extend into the two first positioning holes.

6. The fixed side handle power riveting tool accessory according to claim 3, 4 or 5, wherein the cylindrical handle (1) is provided with a convex ring (18) in the middle, the stop blind hole (10) is arranged at the convex ring (18), the annular positioning sleeve (8) is sleeved on the periphery of the convex ring (18), one end of the annular positioning sleeve (8) is provided with a turned edge (19), and the turned edge (19) is buckled on one side of the convex ring (18).

7. The fixed side handle power riveting tool accessory according to claim 1, 2, 3, 4 or 5, wherein the outer wall of the transmission member (3) is provided with at least one limiting guide groove (20) extending along the axial direction of the transmission member (3), the side part of the cylindrical handle (1) is provided with at least one limiting pin (21) in a penetrating manner, the limiting pins (21) and the limiting guide grooves (20) are arranged in a one-to-one correspondence manner, the inner ends of the limiting pins (21) are positioned in the limiting guide grooves (20), the central axes of the limiting pins (21) are positioned on the same cross section of the cylindrical handle (1), and the central axes of the side handles (7) and the central axes of the limiting pins (21) are coplanar.

8. The fixed-side handle power riveting tool accessory according to claim 7, wherein two limiting guide grooves (20) are symmetrically arranged, two limiting pins (21) are symmetrically arranged, and the central axis of the side handle (7) and the central axis of the limiting pins (21) are perpendicular to each other.

9. The fixed-side handle power riveting tool accessory according to claim 1, 2, 3, 4 or 5, wherein the cylindrical guide nozzle (6) is arranged on a front outer sleeve (22), the front outer sleeve (22) is detachably fixed at the front end of the cylindrical handle (1), and a locking ring (23) abutted against the front end face of the cylindrical handle (1) is detachably connected to the front outer sleeve (22); a safety valve mechanism (25) which can enable the threaded structure (4) to have spiral pair pre-tightening force is arranged between the claw body ejection column (24) and the transmission part (3), and the safety valve mechanism (25) can enable the rotary part (2) to realize spiral pair conversion of the threaded structure (4) before axial reaction force between the front end of each claw body (5) and the rear end of the cylindrical guide nozzle (6) is reduced to zero in the positive rotation process, so that idle-return stroke of the threaded structure (4) is avoided.

10. A fixed side handle power riveting tool attachment according to claim 9, wherein the rotating member (2) is a screw, the driving member (3) is a barrel, and the front end of the screw and the rear end of the barrel are connectable by the thread formation (4); the safety valve mechanism (25) comprises a valve core (27) arranged in the cylinder and capable of being plugged in the middle of the cylinder and a spring (26) arranged between the valve core (27) and a claw body ejection column (24), one end of the spring (26) acts on the claw body ejection column (24), the other end of the spring acts on the valve core (27), and a valve cavity (28) capable of changing volume along with the axial relative position of the screw rod and the cylinder so as to change the internal pressure is formed among the screw rod, the cylinder and the valve core (27).