CN210059834U

CN210059834U - Safety protection device for preventing chuck wrench from being accidentally taken down and lathe

Info

Publication number: CN210059834U
Application number: CN201920906199.2U
Authority: CN
Inventors: 高海兵; 郝慧芬; 王慧; 高霞
Original assignee: Ordos vocational college
Current assignee: Ordos vocational college
Priority date: 2019-06-17
Filing date: 2019-06-17
Publication date: 2020-02-14
Anticipated expiration: 2029-06-17

Abstract

The utility model discloses a prevent that chuck wrench from not taking off unexpected safety arrangement and lathe, this safety arrangement includes locating component, travel switch and height adjusting mechanism. The positioning assembly comprises an inserting barrel and a positioning piece. The inserting cylinder is inserted on the lathe, and the outer wall of the inserting cylinder is provided with a convex part. The positioning piece is sleeved on the inserting barrel, and the bottom end of the positioning piece is abutted to the lathe. The chuck wrench is inserted in the insert cylinder. The travel switch is connected with a lathe circuit in series, is installed in the inserting cylinder, and the detection end abuts against the bottom end of the chuck wrench. The height adjusting mechanism comprises a lifting piece, two sliding blocks and a plurality of elastic pieces. Two sliders are arranged in the inserting cylinder, and opposite surfaces of the two sliders are arranged in parallel. The lifting piece is arranged on the inserting barrel and is used for driving the other sliding block to slide. A plurality of elastic pieces are arranged between the two sliding blocks. The utility model discloses can cushion chuck wrench's striking, protection travel switch satisfies the demand that carries out the protection to chuck wrench that length differs, guarantees the universality that safety arrangement used.

Description

Safety protection device for preventing chuck wrench from being accidentally taken down and lathe

Technical Field

The utility model relates to a lathe technical field's a safety arrangement especially relates to a prevent that chuck spanner from not taking off the safety arrangement who meets accident, still relates to this safety arrangement's lathe.

Background

A lathe is a machine tool for turning a rotating workpiece mainly with a lathe tool. When the lathe is started, the lathe is controlled by the clutch, and the forward and reverse rotation of the lathe can be controlled by pulling the clutch handle. When workers process the workpieces, the workpieces are fixed and clamped by using a chuck wrench.

When a common lathe is used for machining operation, mechanical injury accidents are frequent, and particularly, when workers and students just learn to use the lathe are started by mistake due to unfamiliarity or negligence on the operation performance of equipment, accidents that a chuck wrench injures people or damages machine tool equipment easily occur. For example, if a worker forgets to remove the chuck wrench during machining, the lathe is started, the chuck rotates, and the chuck wrench flies out to hit a person or hit a lathe bed, which may cause an accident. Therefore, the invention patent (publication No. CN201076911Y) discloses a device for preventing a chuck wrench from being operated without being removed, wherein a current breaker is arranged on a chuck wrench support, and if the chuck wrench is not placed at a set position in the support, a lathe cannot be operated. Although this kind of device has guaranteed to a certain extent that the chuck spanner can in time take off from the lathe chuck, in the in-service use, owing to use the chuck spanner repeatedly and strike the current breaker for the current break-make is fragile, can not adapt to the chuck spanner that differs in length completely moreover, and the bottom of part chuck spanner probably touches and can not reach the current breaker, thereby can not realize the function of protection.

SUMMERY OF THE UTILITY MODEL

To current technical problem, the utility model provides a prevent that chuck wrench from not taking off emergence accident's safety arrangement and lathe has solved current protection device and has made the device fragile, can not satisfy the chuck wrench problem of protecting to length differs moreover.

The utility model discloses a following technical scheme realizes: a safety protection device for preventing accidents caused by the fact that a chuck wrench is not taken down is used for accommodating the chuck wrench on a lathe; the safety protection device comprises:

the positioning assembly comprises an inserting cylinder and a positioning piece; the inserting cylinder is inserted on the lathe, and the outer wall of the inserting cylinder is provided with a convex part limited on the bottom surface of the lathe; the positioning piece is sleeved on the inserting cylinder, and the bottom end of the positioning piece is abutted against the lathe; the chuck wrench is inserted into the inserting cylinder;

the travel switch is arranged in the insertion cylinder, and the detection end abuts against the bottom end of the chuck wrench; the travel switch is connected with the lathe in series and is pressed and conducted under the gravity of the chuck wrench to connect a circuit of the lathe; when the chuck wrench leaves the inserting cylinder, the travel switch is in a disconnected state; and

the height adjusting mechanism comprises a lifting piece, two sliding blocks and a plurality of elastic pieces; the two sliding blocks are arranged in the inserting cylinder, and opposite surfaces of the two sliding blocks are arranged in parallel; the travel switch is fixed on one of the slide blocks; the lifting piece is arranged on the inserting barrel and is used for driving the other sliding block to slide along the axial direction of the inserting barrel; a plurality of elastic pieces are arranged between the two sliding blocks.

As a further improvement of the scheme, the bottom end of the insert cylinder is a closed end; the lifting piece comprises a threaded column and a lifting ball; the lifting ball is rotatably arranged in the other slide block and is partially exposed out of the slide block; the threaded column is screwed on the bottom end of the inserting cylinder, and the top end of the threaded column is abutted on the part of the lifting ball exposed out of the sliding block; wherein, the screw post is gone up and down with inserting a section of thick bamboo relatively through rotating to order about the ball that goes up and down to drive the slider and go up and down.

As a further improvement of the scheme, the positioning piece is a threaded sleeve which is in threaded connection with the inserting barrel, and the longitudinal section of the positioning piece is L-shaped.

As a further improvement of the above aspect, each elastic member includes a spring and a telescopic post; two ends of the spring are respectively connected with the two sliding blocks; the telescopic column is arranged in the spring, two ends of the telescopic column are inserted into the two sliding blocks, and the telescopic column can lift relative to the sliding blocks.

As a further improvement of the scheme, the protruding part is of a magnetic structure, and the attraction force generated between the protruding part and the lathe is larger than the gravity of the safety protection device.

As a further improvement of the scheme, the insert cylinder comprises a cylinder body I, a cylinder body II and a plurality of insert pieces; the bottom end of the first cylinder body is provided with a plug pin, and the top end of the second cylinder body is provided with an insertion hole for the plug pin to insert; the plug-in unit is inserted from the outer wall of the cylinder body II and penetrates through the plug pins and the jacks, so that the cylinder body I and the cylinder body II are relatively fixed.

As a further improvement of the scheme, the lifting piece is an electric push rod or an air cylinder, and the driving end is fixed on the sliding block.

As a further improvement of the above solution, the safety protection device further includes:

the dustproof assembly comprises a protective cover and an inserting plate; the protective cover is arranged at the bottom end of the inserting cylinder and surrounds the part of the lifting piece extending out of the inserting cylinder; the insert plate is inserted from the outer wall of the protective cover and can be moved to cover the protective cover.

As a further improvement of the scheme, the part of the insert cylinder, which is positioned below the lathe, is provided with a step, and the convex part is movably connected to the other part of the insert cylinder; the safety protection device further comprises:

each limiting component comprises a limiting sleeve and a limiting column; the bottom end of the limiting sleeve is fixed on the step; the bottom end of the limiting column is in threaded connection with the limiting sleeve, and the top end of the limiting column is fixed on the protruding part; wherein, the middle part of the spacing post is a thread part.

The utility model also provides a lathe, which comprises a chuck wrench; the lathe further comprises any one of the safety protection devices for preventing the chuck wrench from being accidentally taken off;

wherein, the chuck wrench is inserted in the inserting cylinder; the travel switch is connected with the lathe in series and is pressed and conducted under the gravity of the chuck wrench, so that the lathe receives power supply; when the chuck wrench leaves the insert cylinder, the travel switch is in an off state.

The utility model discloses a prevent that chuck wrench from not taking off unexpected safety arrangement and lathe, this safety arrangement's locating component fixes on the lathe, and chuck wrench inserts in inserting a section of thick bamboo, just so can realize the location to chuck wrench, realize the function of holding chuck wrench on the lathe promptly, and place when inserting a section of thick bamboo at chuck wrench, chuck wrench's bottom can touch stroke switch, thereby make stroke switch on, the lathe can be opened this moment, and the stroke switch will break off after chuck wrench leaves, so lathe then can't start, can prevent that lathe chuck wrench from not taking off unexpected, and can cultivate beginner and student place chuck wrench in the good occupational literacy of fixed position.

The utility model discloses in, the slider that is located the upper strata among the height adjusting mechanism is used for fixed travel switch, and the slider of lower floor then can be under the effect of piece that goes up and down to realize travel switch's lift, so to the chuck spanner of different length, can make travel switch go up and down through drive piece and can realize contacting the chuck spanner, thereby satisfy the demand of carrying out the protection to the chuck spanner that length differs, guarantee the universality that safety arrangement used. In addition, because a plurality of elastic pieces are arranged between the two sliding blocks, in the process of inserting the chuck wrench, the elastic pieces can buffer the impact of the chuck wrench, and therefore the travel switch is protected. Moreover, in the in-service use, if the beginner pushes down the chuck spanner that is arranged in the safety arrangement, a plurality of elastic components can cushion, avoid direct damage travel switch.

Drawings

Fig. 1 is a schematic structural view of a safety protection device for preventing accidents when a chuck wrench is not taken down according to embodiment 1 of the present invention;

FIG. 2 is a schematic view of the safety shield apparatus of FIG. 1 mounted to a lathe and receiving a chuck wrench;

fig. 3 is a schematic structural view of a safety protection device for preventing accidents when a chuck wrench is not removed according to embodiment 2 of the present invention;

fig. 4 is a schematic structural view of a safety protection device for preventing accidents when a chuck wrench is not removed according to embodiment 3 of the present invention;

fig. 5 is a schematic structural view of a safety protection device for preventing accidents when a chuck wrench is not removed according to embodiment 4 of the present invention;

fig. 6 is a schematic structural view of a safety protection device for preventing accidents when the chuck wrench is not taken down according to embodiment 5 of the present invention.

Description of the symbols:

1 lathe 13 spacing post

2 chuck wrench 31 barrel 1

3 insert cylinder 32 cylinder body 2

4 retainer 33 insert

5 projection 71 threaded post

6 travel switch 72 lifting ball

7 lifting piece 91 spring

8 slider 92 telescopic column

9 elastic piece 131 screw part

10 protective cover 311 pin

11 plugboard 321 jack

12 position-limiting sleeve

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Example 1

Referring to fig. 1 and 2, the present embodiment provides a safety device for preventing an accident caused by the un-removal of a chuck wrench, and the safety device is used for accommodating a chuck wrench 2 on a lathe 1. Wherein, safety arrangement includes locating component, travel switch 6 and height adjustment mechanism. The positioning assembly is used for positioning the chuck wrench 2 on the lathe 1, namely, the positioning assembly is a containing device of the chuck wrench 2, the travel switch 6 is used for controlling the power supply state of the whole lathe 1, and the height adjusting mechanism is used for adjusting the relative height of the travel switch 6.

The positioning assembly comprises an insert barrel 3 and a positioning piece 4. The insert barrel 3 is inserted on the lathe 1, and the outer wall of the insert barrel 3 is provided with a convex part 5 limited on the bottom surface of the lathe 1. The positioning piece 4 is sleeved on the inserting cylinder 3, and the bottom end of the positioning piece 4 is abutted against the lathe 1. Wherein the chuck wrench 2 is inserted in the insert cylinder 3. So, locating component fixes on lathe 1, and chuck wrench 2 inserts in inserting a section of thick bamboo 3, just so can realize the location to chuck wrench 2, realizes the function of holding chuck wrench 2 on lathe 1 promptly.

In this embodiment, the bottom end of the cartridge 3 is a closed end. The positioning piece 4 is a threaded sleeve which is screwed on the inserting barrel 3, and the longitudinal section of the positioning piece 4 is L-shaped. When specifically installing locating component, the installer can insert the top end of the inserting cylinder 3 from the lower part of the through hole formed in the lathe 1, then move the inserting cylinder 3 upwards until the protruding part 5 is clamped to the bottom surface of the lathe 1, finally sleeve the part of the locating piece 4 exposed out of the lathe 1 from the inserting cylinder 3, make the bottom end of the locating piece 4 support on the lathe 1 by rotating the locating piece 4, and the distance between the locating piece 4 and the protruding part 5 is equal to the thickness of the lathe 1 at this moment, so as to realize the installation work of the locating component. For convenience of installation, the protruding portion 5 may be of a magnetic structure, and the attraction force generated between the protruding portion 5 and the lathe 1 is greater than the gravity of the safety protection device, so that after the insertion cylinder 3 is inserted and the positioning member 4 is not installed, the protruding portion 5 can enable the insertion cylinder 3 to be kept on the lathe 1 through the attraction force, and subsequent installation of the positioning member 4 is facilitated. Of course, the magnetic structure can be a permanent magnet or an electromagnet, and can be selected according to actual needs.

The travel switch 6 is mounted in the barrel 3 and the sensing end of the travel switch 6 abuts against the bottom end of the chuck wrench 2. The travel switch 6 is connected in series with the lathe 1 and is pressed down and conducted under the gravity of the chuck wrench 2, so that the circuit of the lathe 1 is connected to receive power supply. When the chuck wrench 2 leaves the socket 3, the stroke switch 6 is in an off state. When the chuck wrench is inserted in inserting a section of thick bamboo, travel switch 6 can be touched to chuck wrench 2's bottom to make travel switch 6 switch on, lathe 1 can open this moment, and will break off after chuck wrench 2 leaves rear travel switch 6, so lathe 1 then can't start, can prevent that chuck wrench 2 from not taking off and meeting accident, and can cultivate beginner and student and place chuck wrench 2 in the good occupational literacy of fixed position.

The height adjusting mechanism comprises a lifting piece 7, two sliding blocks 8 and a plurality of elastic pieces 9. Two sliding blocks 8 are arranged in the inserting cylinder 3, and opposite surfaces are arranged in parallel. The travel switch 6 is fixed on one of the sliders 8. The lifting piece 7 is arranged on the inserting cylinder 3 and is used for driving the other slide block 8 to slide along the axial direction of the inserting cylinder 3. A plurality of elastic members 9 are disposed between the two sliders 8. The slider 8 that is located the upper strata is used for fixed travel switch, and the slider 8 of lower floor then can go up and down under the effect of piece 7 that goes up and down to realize travel switch 6's lift, so to the chuck spanner 2 of different length, can make travel switch 6 go up and down through drive piece 7 that goes up and down and can realize contacting chuck spanner 2, thereby satisfy the demand of carrying out the protection to chuck spanner 2 that length differs, guarantee the universality that safety arrangement used. In addition, because a plurality of elastic pieces 9 are arranged between the two sliding blocks 8, the elastic pieces 9 can buffer the impact of the chuck wrench 2 in the process of inserting the chuck wrench 2, so that the travel switch 6 is protected. Moreover, in the in-service use, if the beginner pushes down the chuck wrench 2 that is located safety arrangement, a plurality of elastic components 9 can cushion, avoid direct damage travel switch 6.

In this embodiment, the lift 7 includes a threaded post 71 and a lift ball 72. The lifting ball 72 is rotatably mounted in the other slide block 8 and partially exposed out of the slide block 8. The screw column 71 is screwed on the bottom end of the insert cylinder 3, and the top end of the screw column 71 abuts on the part of the lifting ball 72 exposed out of the slide block 8. Wherein, user of service passes through rotation screw post 71, and screw post 71 can be inserted a section of thick bamboo 3 relatively and go up and down to order about lift ball 72 and drive slider 8 and go up and down, and then make travel switch 6 produce the change in the position of inserting a section of thick bamboo 3 relatively, the position of 2 bottoms of this chuck spanner just can produce the change, satisfies the demand of protecting chuck spanner 2 that differs to length. Moreover, the adjusting mode can be operated manually, and can be operated at any time and any place, so that the real-time performance of safety protection is ensured.

In addition, each elastic member 9 may include a spring 91 and a telescopic post 92, although in other embodiments the elastic member 9 may include only the spring 91 and may include only other elastic structures. Two ends of the spring 91 are respectively connected with the two sliding blocks 8, and the two sliding blocks can be connected by welding and the like. The telescopic column 92 is arranged in the spring 91, two ends of the telescopic column 92 are inserted into the two sliding blocks 8, and two ends of the telescopic column 92 can be lifted relative to the sliding blocks 8. When the two sliders 8 generate relative displacement, the spring 91 can play an elastic role, and the telescopic column 92 can play a guiding role.

In conclusion, the safety protection device for preventing the chuck wrench from being accidentally taken off in the embodiment has the following advantages:

1. this safety arrangement's locating component fixes on lathe 1, and chuck wrench 2 inserts and inserts in a section of thick bamboo 3, just so can realize the location to chuck wrench 2, realize the function of holding chuck wrench 2 on lathe 1 promptly, and place when inserting a section of thick bamboo 3 at chuck wrench 2, stroke switch 6 can be touched and pressed to chuck wrench 2's bottom, thereby make stroke switch 6 switch on, lathe 1 can open this moment, and will break off after chuck wrench 2 leaves rear stroke switch 6, so lathe 1 then can't start, chuck wrench 2 that can prevent the lathe does not take off and takes place the accident, and can cultivate beginner and student and the good occupational literacy that chuck wrench 2 placed in fixed position.

2. In this embodiment, the slider 8 that lies in the upper strata among the height adjusting mechanism is used for fixed travel switch 6, and the slider 8 of lower floor then can be under the effect of lifter 7 and go up and down, thereby realize travel switch 6's lift, so to the chuck wrench 2 of different length, can make the lift of travel switch 6 can realize contacting chuck wrench 2 through drive lifter 7, thereby satisfy the demand of protecting chuck wrench 2 that differs in length, guarantee the universality that safety arrangement used. In addition, because a plurality of elastic pieces 9 are arranged between the two sliding blocks 8, the elastic pieces 9 can buffer the impact of the chuck wrench 2 in the process of inserting the chuck wrench 2, so that the travel switch 6 is protected. Moreover, in the in-service use, if the beginner pushes down the chuck wrench 2 that is located safety arrangement, a plurality of elastic components 9 can cushion, avoid direct damage travel switch 6.

Example 2

Referring to fig. 3, the present embodiment provides a safety protection device for preventing an accident that a chuck wrench is not removed, which is similar to the safety protection device of embodiment 1, except that the structure of the insertion tube 3 in the present embodiment is different. In the present embodiment, the cartridge 3 includes a first cylinder 31, a second cylinder 32, and a plurality of inserts 33. The bottom end of the first cylinder 31 is provided with a pin 311, and the top end of the second cylinder 32 is provided with a plug hole 321 for inserting the pin 311. Thus, the pins 311 are inserted into the insertion holes 321 when the first barrel 31 and the second barrel 32 are connected. The insert 33 is inserted from the outer wall of the second barrel 32 and passes through the pins 311 and the insertion holes 321, so that the first barrel 31 and the second barrel 32 are fixed relatively. The structure of the plug barrel 3 of the embodiment enables the plug barrel 3 to be disassembled into multiple parts, so that other devices can be installed or removed in the plug barrel 3, and installation and later maintenance are convenient.

Example 3

Referring to fig. 4, the present embodiment provides a safety protection device for preventing an accident that a chuck wrench is not taken down, which is similar to the safety protection device of embodiment 1, except that the lifting member 7 of the present embodiment is an electric push rod or an air cylinder, and the driving end of the lifting member 7 is fixed on the sliding block 8. When adjusting travel switch 6's height, the regulating personnel can carry out work through drive electric putter or cylinder can, can adjust more fast like this, and the precision of adjusting also can promote greatly moreover.

Example 4

Referring to fig. 5, the present embodiment provides a safety protection device for preventing an accident that a chuck wrench is not removed, which is added with a dust-proof component on the basis of embodiment 1. Wherein, dustproof subassembly includes safety cover 10 and picture peg 11. A protective cover 10 is mounted on the bottom end of the barrel 3 and encloses the part of the lifter 7 that protrudes out of the barrel 3. The insert plate 11 is inserted from the outer wall of the protection cover 10 and can be moved to cover the protection cover 10. When the relative height of the travel switch 6 does not need to be adjusted, a user can push the inserting plate 11 to enable the inserting plate 11 to cover the protective cover 10, so that dust is prevented from entering from the joint of the lifting piece 7 and the inserting cylinder 3, and the working environment in the safety protection device is guaranteed. When the relative height of the travel switch 6 needs to be adjusted, a user can directly pull out the plug board 11, so that the lifting piece 7 can be directly rotated to lift the travel switch 6.

Example 5

Referring to fig. 6, the embodiment provides a safety protection device for preventing an accident that a chuck wrench is not taken down, which is added with a plurality of limiting components on the basis of embodiment 1. In this embodiment, the part of the barrel 3 below the lathe 1 has a step, and the projection 5 is movably connected to the other part of the barrel 3.

Each limiting assembly comprises a limiting sleeve 12 and a limiting column 13. The bottom end of the stop collar 12 is fixed on the step. The bottom end of the limit post 13 is screwed in the limit sleeve 12, and the top end of the limit post 13 is fixed on the bulge part 5. Wherein, the middle part of the spacing column 13 is a thread part 131. When lathe 1's thickness changes, the regulating personnel can make spacing post 13 rotate through rotatory screw thread portion 131 to make spacing post 13 and stop collar 12 produce relative lift, and then change the height of bulge 5, realize setting element 4 and the regulation of bulge 5 relative position, thereby satisfy the demand of the lathe 1 of different grade type.

Example 6

With continued reference to fig. 2-6, the present embodiment provides a lathe including a chuck wrench 2 and any of the safety features provided in embodiments 1-5 to prevent accidental undetachment of the chuck wrench. Wherein, the chuck wrench 2 is inserted in the insert cylinder 3; the travel switch 6 is connected with the lathe in series and is pressed down and conducted under the gravity of the chuck wrench 2, so that the lathe receives power supply; when the chuck wrench 2 leaves the socket 3, the stroke switch 6 is in an off state.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A safety protection device for preventing accidents caused by the situation that a chuck wrench is not taken down is used for accommodating a chuck wrench (2) positioned on a lathe (1); characterized in that, the safety arrangement includes:

the positioning assembly comprises an inserting cylinder (3) and a positioning piece (4); the inserting cylinder (3) is inserted on the lathe (1), and the outer wall of the inserting cylinder is provided with a convex part (5) limited on the bottom surface of the lathe (1); the positioning piece (4) is sleeved on the inserting barrel (3), and the bottom end of the positioning piece is abutted against the lathe (1); the chuck wrench (2) is inserted into the insert cylinder (3);

the travel switch (6) is arranged in the insertion cylinder (3), and the detection end abuts against the bottom end of the chuck wrench (2); the travel switch (6) is connected with the lathe (1) in series and is pressed down and conducted under the gravity of the chuck wrench (2) to connect the circuit of the lathe (1); when the chuck wrench (2) leaves the inserting cylinder (3), the travel switch (6) is in a disconnected state; and

the height adjusting mechanism comprises a lifting piece (7), two sliding blocks (8) and a plurality of elastic pieces (9); the two sliding blocks (8) are arranged in the inserting cylinder (3), and opposite surfaces are arranged in parallel; the travel switch (6) is fixed on one of the slide blocks (8); the lifting piece (7) is arranged on the inserting barrel (3) and is used for driving the other sliding block (8) to slide along the axial direction of the inserting barrel (3); a plurality of elastic pieces (9) are arranged between the two sliding blocks (8).

2. A safety protection device against accidental un-removal of a chuck wrench according to claim 1, wherein the bottom end of the barrel (3) is closed; the lifting piece (7) comprises a threaded column (71) and a lifting ball (72); the lifting ball (72) is rotatably arranged in the other sliding block (8) and is partially exposed out of the sliding block (8); the threaded column (71) is screwed on the bottom end of the inserting cylinder (3), and the top end of the threaded column is abutted against the part of the lifting ball (72) exposed out of the sliding block (8); wherein, the threaded column (71) is rotated to lift relative to the inserting cylinder (3) so as to drive the lifting ball (72) to drive the sliding block (8) to lift.

3. The safety device for preventing accidental undetachment of a chuck wrench as claimed in claim 1, wherein the positioning member (4) is a threaded sleeve threaded on the socket (3) and has an L-shaped longitudinal section.

4. A safety arrangement against accidental undetachment of a chuck wrench as in claim 1, wherein each resilient member (9) comprises a spring (91) and a telescopic column (92); two ends of the spring (91) are respectively connected with the two sliding blocks (8); the telescopic column (92) is arranged in the spring (91), and two ends of the telescopic column are inserted into the two sliding blocks (8) and can lift relative to the sliding blocks (8).

5. Safety device against accidental unmounting of the chuck wrench according to claim 1, characterized in that the projection (5) is of magnetic construction and the attraction with the lathe (1) is greater than the weight of said safety device.

6. A safety arrangement for preventing accidental undetachment of a chuck wrench as claimed in claim 1, wherein the cartridge (3) comprises a first body (31), a second body (32) and a plurality of inserts (33); the bottom end of the cylinder body I (31) is provided with a pin (311), and the top end of the cylinder body II (32) is provided with a jack (321) for inserting the pin (311); the plug (33) is inserted from the outer wall of the second cylinder (32) and penetrates through the plug pin (311) and the insertion hole (321), so that the first cylinder (31) and the second cylinder (32) are relatively fixed.

7. A safety arrangement for preventing accidental undetachment of a chuck wrench as claimed in claim 1, wherein the lifting member (7) is an electric push rod or a pneumatic cylinder and the driving end is fixed to the slider (8).

8. The safety shield for preventing accidental removal of a chuck wrench as claimed in claim 1, further comprising:

a dust-proof assembly comprising a protective cover (10) and an insert plate (11); the protective cover (10) is arranged on the bottom end of the insert cylinder (3) and surrounds the part of the lifting piece (7) extending out of the insert cylinder (3); the insert plate (11) is inserted from the outer wall of the protective cover (10) and can be moved to cover the protective cover (10).

9. The safety protection device for preventing the accidental undetachment of the chuck wrench as claimed in claim 1, wherein the part of the insert cylinder (3) under the lathe (1) is provided with a step, and the bulge (5) is movably connected to the insert cylinder (3); the safety protection device further comprises:

each limiting component comprises a limiting sleeve (12) and a limiting column (13); the bottom end of the limiting sleeve (12) is fixed on the step; the bottom end of the limiting column (13) is screwed in the limiting sleeve (12), and the top end is fixed on the protruding part (5); wherein, the middle part of the spacing column (13) is a thread part (131).

10. A lathe comprising a chuck wrench (2); the lathe is characterized by further comprising a safety protection device for preventing the chuck wrench from being accidentally removed according to any one of claims 1 to 9;

wherein the chuck wrench (2) is inserted into the insert cylinder (3); the travel switch (6) is connected with the lathe in series and is pressed down and conducted under the gravity of the chuck wrench (2), so that the lathe receives power supply; when the chuck wrench (2) leaves the insert cylinder (3), the travel switch (6) is in an off state.