CN111185797A

CN111185797A - A rotatory protector for on lathe

Info

Publication number: CN111185797A
Application number: CN202010072412.1A
Authority: CN
Inventors: 刘士一; 叶政; 张风权
Original assignee: Ruiji Industrial Technology Shanghai Co ltd
Current assignee: WEIYI GREEN ENVIRONMENTAL TECHNOLOGY (HAIYAN) Co.,Ltd.
Priority date: 2020-01-21
Filing date: 2020-01-21
Publication date: 2020-05-22
Anticipated expiration: 2040-01-21
Also published as: CN111185797B

Abstract

The invention discloses a rotary protection device for a machine tool, which comprises an outer cover and an arc door arranged on the outer cover, wherein the outer cover comprises a suspended ceiling structure, the suspended ceiling structure comprises a lower top plate and an upper top plate positioned on the lower top plate, the upper top plate is fixed at the top of the outer cover, the lower top plate and the arc door synchronously move, a threading hole is arranged on the surface of the upper top plate in a penetrating way, an arc-shaped kidney-shaped groove corresponding to the threading hole is arranged on the surface of the lower top plate in a penetrating way, a pipeline sequentially passes through the threading hole and the kidney-shaped groove and then enters the outer cover, reinforcing bodies for increasing the structural strength of the kidney-shaped groove and the lower top plate are integrally formed on the edges of the kidney-shaped groove and the lower top plate, the bottom structure of the outer cover can keep better bearing capacity, the routing of the pipeline is changed, the pipeline enters a processing area from high to low, keep the furred ceiling structure to have better bearing capacity.

Description

A rotatory protector for on lathe

Technical Field

The invention relates to the technical field of machine tool protection, in particular to a rotary protection device for a machine tool.

Background

Machine tools are devices often used in the machining industry for machining parts; at present, most machine tools on the market are provided with a safety protection outer cover, the outer cover is usually designed into a straight slidable flat door, in order to provide a large enough passage to a machining area of the machine tool, two sliding doors which are arranged in a staggered mode are adopted, and the sliding doors which are operated separately have sealing problems at the butt joint edge parts of the sliding doors on two sides.

In the prior art, in a chinese patent document No. CN1123421C, there is described a machine tool having a machining area housing including at least one circular arc door slidably provided on a circular rail around a vertical axis in proximity to a machining area, the circular arc door including a cylindrically curved side wall and a cover member formed as a part of a circle, such as a quarter circle, the curved side wall and the cover member being fixedly connected to each other, in a closed state, covering a machining area or a machining space of a milling and drilling universal machine tool on a right outer side and a front side, and in a fully opened state, allowing access from the front side and the outer side, the fixed part of the protection room including two parallel side walls and a side wall portion having a circular arc front portion, the side walls and the circular arc side wall portion being connected by an upper cover plate, the front portion of the machining area of the machine tool not covered by the closed circular arc door being closed by the circular arc side wall portion, the fixed part of the protection cell may be fixed to the bed or the machine frame.

The circular-arc door is hinged to an upper hinge on the cover plate, which is formed as a trunnion so as to rotate about a vertical line, and on the bottom side is slidingly guided on a circular-arc guide which is located on the chassis and which is formed, for example, in the form of a guide rail. The combination of the upper hinge and the lower arcuate guide constitutes an inexpensive and stable guide. Due to the rigid construction of the circular arc door and the stabilizing guide, sealing of the abutting edges of the circular arc door, for example, can also be simplified. The circular arc door is provided with a cover plate which inclines towards the inner side of the chassis; the cover plate overlaps the circular arc guide when the door is closed. Thus, the chips generated in the machining process can slide to the front inclined bottom disc surface along the cover plate, and the circular arc-shaped guide device is protected from being polluted.

The above prior art solutions have the following drawbacks: working components such as a milling head and a motor which are arranged in the machining area outer cover need to be connected with a circuit pipeline and an oil pipeline, the working components are generally arranged below the machining area cover body, a pipeline access opening needs to be formed in the bottom of the machining area cover body, a circuit at the bottom of a machine tool is fed into the machining area cover body, and therefore the structural support strength of the bottom of the machining area cover body is reduced, and the bottom bearing capacity of the cover body is weakened.

Disclosure of Invention

In view of the above technical problems, an object of the present invention is to provide a rotation protection device for a machine tool, which changes the routing of pipelines and can maintain a good load-bearing capacity of the bottom structure of the housing.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a rotatory protector for on lathe, includes the dustcoat, sets up the convex door on the dustcoat, the dustcoat includes the furred ceiling structure, the furred ceiling structure includes roof down, is located the last roof on the roof down, it is fixed in the dustcoat top to go up the roof, roof and the synchronous motion of convex door down, it is equipped with the through wires hole to go up the roof surface and run through, roof surface runs through down and is equipped with the circular-arc kidney slot corresponding with the through wires hole, and the pipeline passes in proper order and gets into in the dustcoat behind through wires hole, kidney slot and the edge integrated into one piece of roof down have the reinforcement that increases kidney slot, roof structural strength down.

Through adopting above-mentioned technical scheme, the line passes through wires hole and kidney slot on the furred ceiling structure in proper order, enter into the dustcoat in, a work that is used for the inside cutter head of dustcoat and motor is used, penetrate the dustcoat with the pipeline inside from the top of dustcoat, need not destroy the substructure of dustcoat, the substructure of dustcoat can keep better bearing capacity, change the line of walking of pipeline, by high to low entering into the processing district in, and through the structural strength of roof under the two points reinforcement, strengthen the intensity of furred ceiling structure, it has better bearing capacity to keep the furred ceiling structure.

The invention is further configured to: the reinforcing body comprises a first convex edge extending along the edge of the kidney-shaped groove.

Through adopting above-mentioned technical scheme, first chimb has strengthened the structural strength that the roof is located the kidney slot border down for the structure of kidney slot can not receive destruction.

The invention is further configured to: the reinforcing body further comprises a second convex edge extending along the edge of the lower top plate.

Through adopting above-mentioned technical scheme, the second chimb has strengthened the structural strength at roof border down, through the first protruding structural strength who increases roof down in two different positions with the second arch.

The invention is further configured to: the surface of the lower top plate is integrally provided with a circular arc convex edge used for enhancing the structural strength of the lower top plate.

Through adopting above-mentioned technical scheme, the structural strength of roof under the convex chimb reinforcing cooperatees with first chimb, second chimb, and the structural strength of roof under the different positions reinforcing of three.

The invention is further configured to: the outer edge of the lower top plate is provided with a first arc plate and a circular arc waistband from inside to outside along the radial direction of the lower top plate, the first arc plate is integrally formed with the bottom surface of the lower top plate, a first locking bolt is installed on one side of the first arc plate, the first locking bolt penetrates through the first arc plate and is in threaded fit with a threaded hole in the circular arc waistband, and the top of the circular arc door is locked and fixed on the first locking bolt and the circular arc waistband.

Through adopting above-mentioned technical scheme, first arc and convex waistband cooperate and press from both sides the top of tight fixed convex door, and the back is screwed up to first locking bolt, plays better fixed effect to the top of convex door.

The invention is further configured to: and a fixing pin piece which radially penetrates through the first arc-shaped plate along the lower top plate and is matched with the fixing groove on the arc-shaped door in a positioning manner is arranged on one side of the first arc-shaped plate.

Through adopting above-mentioned technical scheme, fixed pin spare passes the fixed slot location fit on the convex door behind the first arc, and fixed pin spare plays the fixed action to the top of convex door, prevents that convex door from falling because of self gravity influence, makes the installation of convex door firm, reliable.

The invention is further configured to: one side of the arc-shaped waistband facing the first arc-shaped plate is fixedly provided with a protruding part, and a sealing cushion block attached to the surface of the first arc-shaped plate is arranged on the protruding part.

Through adopting above-mentioned technical scheme, sealing cushion fills up between bellying and first arc, plays sealed effect to the clearance between bellying and the first arc, and makes and realize contradicting each other between convex waistband, sealing cushion and the first arc three, plays fine conflict installation effect.

The invention is further configured to: the outer cover comprises an annular base used for installing and placing the arc-shaped door, a second arc-shaped plate extending along the circumferential direction of the outer cover is placed on the surface of the annular base, an arc edge is fixedly arranged on the outer side of the annular base, the bottom of the arc-shaped door is located between the second arc-shaped plate and the arc edge, and the second arc-shaped plate is provided with a second locking bolt which penetrates through the second arc-shaped plate and is in threaded fit with a locking hole in the arc edge.

Through adopting above-mentioned technical scheme, the bottom locking fixed mounting of convex door is bordured between second arc, circular arc, plays firm, stable installation effect to the bottom of convex door, and the screw thread mode dismouting is also convenient.

The invention is further configured to: and a reverse top thread part which is abutted against the outer side surface of the second arc-shaped plate is arranged on the inner side surface of the bottom of the arc-shaped wrapping edge.

Through adopting above-mentioned technical scheme, anti-apical thread spare gives second arc bottom lateral surface one along radial internal anti-apical force, prevents that second arc bottom outwards inclines to warp.

In conclusion, the invention has the following beneficial effects:

1. the bottom structure of the outer cover can keep better bearing capacity, changes the routing of pipelines, enters a processing area from high to low, and reinforces the structural strength of the lower top plate through two points to reinforce the strength of the suspended ceiling structure and keep the suspended ceiling structure to have better bearing capacity;

2. the both ends of arc door are installed on the dustcoat through compressing tightly fixed mode, and it is fixed to the both ends of arc door to screw up through first locking bolt, second locking bolt, play firm, stable installation effect.

Drawings

FIG. 1 is a schematic structural view of the present invention for embodying a position of mounting on a machine tool;

FIG. 2 is an exploded view of the first embodiment of the present invention for embodying the ceiling structure construction on the enclosure;

FIG. 3 is a top plan view of the lower top plate of the present invention;

FIG. 4 is a second exploded view of the present invention, illustrating the location of the circular base and the circular border;

FIG. 5 is an enlarged view of portion A of FIG. 4, illustrating the mounting configuration of the first curved plate, the top of the circular door, the gasket, the boss, and the circular waistband;

FIG. 6 is a partial cross-sectional view of the first embodiment of the present invention, illustrating a structure for locking and fixing the top position of the circular arc door;

FIG. 7 is a third schematic exploded view of the present invention, illustrating the location of the annular base and the circular arc border;

FIG. 8 is an enlarged view of the portion B in FIG. 7, showing the positions of the second locking bolt and the third through hole;

FIG. 9 is a second partial sectional view of the present invention, illustrating a structure for locking and fixing the position of the bottom of the door with a circular arc shape;

FIG. 10 is a schematic view of the construction of the ring base of the present invention;

fig. 11 is a schematic cross-sectional view of the present invention showing the location and configuration of bristles.

Reference numerals: 1. a housing; 101. an opening; 102. a cover body side wall; 2. a suspended ceiling structure; 201. an upper top plate; 202. a lower top plate; 203. a first through hole; 204. a second through hole; 205. an annular flange; 206. a connecting shaft; 207. a bearing; 208. a kidney-shaped groove; 209. an annular base; 3. a circular arc door; 4. threading holes; 5. a second flange; 6. a first flange; 7. a circular arc convex edge; 8. a reinforcement body; 9. brushing; 10. a first arc-shaped plate; 11. sealing the cushion block; 12. a boss portion; 13. a circular arc-shaped waistband; 14. a first through hole; 15. a first locking bolt; 16. fixing grooves; 17. a second arc-shaped plate; 18. a second locking bolt; 19. a third through hole; 20. arc edge covering; 21. a locking sleeve; 22. a fixing member; 23. a second through hole; 24. a locking hole; 26. and (4) reversely jacking the screw rod.

Detailed Description

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

Example (b): a rotation protection device for a machine tool comprises an outer cover 1 and an arc door 3 arranged on the outer cover 1, wherein the outer cover 1 is cylindrical, the arc door 3 is positioned on the outer side of the outer cover 1, the radian of the arc door 3 is equal to that of the outer surface of the outer cover 1, an opening 101 is formed in the side surface of the outer cover 1, the arc door 3 can slide on the outer cover 1 in an arc track to open or close the opening 101, the outer cover 1 and the arc door 3 form a sealed processing area under the condition that the arc door 3 closes the opening 101, and a milling head and a motor are arranged in the processing area.

As shown in fig. 2 and 4, the housing 1 includes a ceiling structure 2 and a housing sidewall 102, the ceiling structure 2 is located at the top of the housing sidewall 102, the ceiling structure 2 includes a circular upper top plate 201 and a circular lower top plate 202, the upper top plate 201 is located on the lower top plate 202, the housing sidewall 102 is in the shape of an arc with a quarter circle in circumference, and the upper top plate 201 is fixedly installed at the top of the housing sidewall 102; the upper top plate 201 is provided with a first through hole 203 at the center of a circle, the bottom surface of the upper top plate 201 is provided at the edge of the first through hole 203 with an integrally formed annular convex edge 205 extending along the circumference of the first through hole 203, the annular convex edge 205 protrudes out of the bottom surface of the upper top plate 201, the lower top plate 202 is provided at the center of a circle with a second through hole 204 corresponding to the first through hole 203, the second through hole 204 is circular and has a diameter larger than the outer diameter of the annular convex edge 205, the inner wall of the second through hole 204 is provided with six connecting shafts 206, the connecting shafts 206 are arranged along the circumference of the annular convex edge 205, the six connecting shafts 206 are all fixedly connected with the lower top plate 202, one end of the connecting shaft 206 is provided with a bearing 207, the outer circumferential surface of the bearing 207 is abutted against the outer circumferential surface of the annular convex edge 205, the six bearings 207 are matched to limit the annular convex edge 205 therein, and the lower top, the lower top plate 202 is arranged on the upper top plate 201, the central axis of the annular convex edge 205 is used as a rotation axis, the top of the arc-shaped door 3 is fixedly connected with the outer edge of the lower top plate 202, the arc-shaped door 3 is driven to synchronously rotate on the outer cover 1 through the rotation of the lower top plate 202, and the opening 101 is opened or closed in the rotating process.

As shown in fig. 2, the surface of the upper top plate 201 is provided with a threading hole 4 penetrating through the upper top plate 201, the surface of the lower top plate 202 is provided with a kidney-shaped groove 208 penetrating through the lower top plate 202, the shape of the kidney-shaped groove 208 is arc-shaped, the kidney-shaped groove 208 corresponds to the threading hole 4 up and down in the height direction of the outer cover 1, the pipelines of the circuit and the oil circuit sequentially penetrate through the threading hole 4 and the kidney-shaped groove 208 and then enter a processing area in the outer cover 1, the kidney-shaped groove 208 is arranged, so that the lower top plate 202 can normally rotate, interference of the pipelines is avoided, the kidney-shaped groove 208 is in a moving state during rotation, and the pipelines.

Referring to fig. 11, a sealing member for sealing a radial gap between the upper top plate 201 and the lower top plate 202 is disposed between the upper top plate 201 and the lower top plate 202, in this embodiment, the sealing member is bristles 9, the bristles 9 are fixedly mounted on the surface of the lower top plate 202 and are located on the other side of the first convex edge 6 close to the waist-shaped groove 208, the bristles 9 are circumferentially arranged around the lower top plate 202, tops of the bristles 9 abut against a bottom surface of the upper top plate 201 to seal a horizontal gap between the upper top plate 201 and the lower top plate 202, so that industrial waste gas exhausted upwards from the waist-shaped groove 208 is prevented from being exhausted from the gap between the upper top plate 201 and the lower top plate 202, and waste gas exhaust in industrial production is controlled.

As shown in fig. 2, a reinforcement body 8 for enhancing the structural strength of the kidney-shaped groove 208 and the lower top plate 202 is integrally formed on the surface of the lower top plate 202, the reinforcement body 8 includes a first convex edge 6 and a second convex edge 5, the first convex edge 6 is integrally formed on the edge of the kidney-shaped groove 208, extends along the length direction of the kidney-shaped groove 208, and protrudes out of the surface of the lower top plate 202, the second convex edge 5 is integrally formed on the outer edge of the lower top plate 202, extends along the edge circumference of the lower top plate 202, and protrudes out of the surface of the lower top plate 202; in addition, the surface of the lower top plate 202 is integrally provided with an arc-shaped convex edge 7, the arc-shaped convex edge 7 extends in an arc shape from one end of the kidney-shaped groove 208 to a direction away from the kidney-shaped groove 208, and the arc-shaped convex edge 7 is used for enhancing the structural strength of the lower top plate 202.

As shown in fig. 4 and 5, the outer edge of the lower top plate 202 is provided with a first arc-shaped plate 10 and an arc-shaped waistband 13, the first arc-shaped plate 10 and the arc-shaped waistband 13 are sequentially arranged from inside to outside along the radial direction of the lower top plate 202, and are all arc-shaped, the first arc-shaped plate 10 and the bottom surface of the lower top plate 202 are integrally formed, the top end of the arc-shaped door 3 is located between the first arc-shaped plate 10 and the arc-shaped waistband 13, the circle centers of arcs corresponding to the arc-shaped door 3, the first arc-shaped plate 10 and the arc-shaped waistband 13 are the same, the diameter of the circle where the first arc-shaped plate 10 corresponds to is larger than that of the circle where the first arc-shaped plate 10 corresponds to, as shown in fig. 6, a first locking bolt 15 is installed on one side of the first arc-shaped plate 10 near the inner side, a first through hole 14 for the first locking bolt 15 to pass through from inside to outside is formed on the, the protruding portion 12 extends along the length direction of the first arc-shaped plate 10, a threaded hole 21 in threaded fit with the first locking bolt 15 is formed in the inner side face of the protruding portion 12, and the threaded hole 21 extends along the thickness direction of the protruding portion 12.

As shown in fig. 6, a sealing pad 11 is disposed on the protruding portion 12, and extends along the length direction of the protruding portion 12, the sealing pad 11 is located between the first arc 10 and the protruding portion 12, and is attached to the surface of the first arc 10, during installation, the first locking bolt 15 is screwed on the threaded hole 21 of the protruding portion 12 by the inner side of the first arc 10 after sequentially passing through the first arc 10 and the sealing pad 11, the first locking bolt 15 is screwed, the circular arc waistband 13 moves close to the first arc 10, and the first arc 10 and the circular arc waistband 13 cooperate to clamp and fix the top end of the circular arc door 3.

As shown in fig. 5 and 6, a second through hole 23 penetrating through the first arc-shaped plate 10 along the radial direction of the lower top plate 202 is formed in one side of the first arc-shaped plate 10, a fixing groove 16 is formed in the surface, facing the first arc-shaped plate 10, of the arc-shaped door 3, the cross-sectional shape of the fixing groove 16 is triangular, a fixing member 22 is arranged on the inner side of the first arc-shaped plate 10, in this embodiment, the fixing member 22 is a fixing pin, the fixing member 22 penetrates through the second through hole 23 from the inner side to the outer side and then is in positioning fit with the fixing groove 16 on the arc-shaped door 3, and the fixing member 22 plays a role in fixing the top position of the arc-shaped door.

As shown in fig. 7 and 8, the outer cover 1 further includes an annular base 209, a second arc-shaped plate 17 is placed on the surface of the annular base 209, the second arc-shaped plate 17 is perpendicular to the surface of the annular base 209 and extends along the circumferential direction of the outer cover 1, the circle diameter corresponding to the outer edge of the annular base 209 is larger than the circle diameter corresponding to the outer edge of the second arc-shaped plate 17, an arc-shaped edge 20 is fixedly disposed on the outer side of the annular base 209, the circle centers corresponding to the second arc-shaped plate 17, the arc-shaped edge 20 and the annular base 209 are overlapped (see fig. 10), the bottom of the arc-shaped door 3 is located between the second arc-shaped plate 17 and the arc-shaped edge 20, as shown in fig. 9, a second locking bolt 18 and a third through hole 19 are disposed on the second arc-shaped plate 17, the third through hole 19 penetrates through the second arc-shaped plate 17 from inside to outside, a locking sleeve 21 is integrally formed on the inner side, the locking hole 24 is internally provided with an internal thread which is matched with the external thread on the second locking bolt 18 in a threaded manner, during installation, the second locking bolt 18 penetrates through the second arc-shaped plate 17 from inside to outside and then is matched with the locking hole 24 on the locking sleeve 21 in a threaded manner, the second locking bolt 18 is screwed, the second arc-shaped plate 17 moves close to the arc-shaped edge covering 20, clamping and fixing of the bottom of the arc-shaped door 3 are achieved, the bottom surface of the arc-shaped door 3, which is located between the second arc-shaped plate 17 and the arc-shaped edge covering 20, is abutted to the outer circumferential surface of the locking sleeve 21, and the bottom of the arc-shaped door 3 is.

As shown in fig. 9, the side of the circular arc edge cover 20 facing the second arc-shaped plate 17 is provided with a reverse-pushing screw 26, one end of the reverse-pushing screw 26 is welded and fixed to the side of the circular arc edge cover 20, the other end of the reverse-pushing screw is abutted to the outer side of the second arc-shaped plate 17, the setting height of the reverse-pushing screw 26 is lower than the installation height of the second locking bolt 18, the reverse-pushing screw 26 gives a reverse pushing force to the center of the second arc-shaped plate 17 to the outer side of the second arc-shaped plate 17, and the bottom of the second arc-shaped plate 17 is prevented from.

The working principle of the invention is as follows: 1 top of dustcoat sets up furred ceiling structure 2, the pipeline passes through wires hole 4 and kidney slot 208 on the furred ceiling structure 2 in proper order, enter into the processing district in dustcoat 1, a work used for cutter head and motor in the processing district, 8 reinforcers can reinforce furred ceiling structure 2's self structural strength, through first chimb 6, the reinforcement of three departments of second chimb 5 and convex chimb 7, make furred ceiling structure 2 after the trompil fluting keep better structural strength, the both ends of circular arc door are respectively through first locking bolt 15, the fastening installation is realized to second locking bolt 18, the circular arc door can move roof 202 and carry out the rotation under the synchronous drive on dustcoat 1, realize opening 101's opening and closing on dustcoat 1.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims

1. The utility model provides a rotatory protector for on lathe, includes dustcoat (1), sets up arc door (3) on dustcoat (1), its characterized in that: the outer cover (1) comprises a suspended ceiling structure (2), the suspended ceiling structure (2) comprises a lower top plate (202) and an upper top plate (201) located on the lower top plate (202), the upper top plate (201) is fixed to the top of the outer cover (1), the lower top plate (202) and the arc-shaped door (3) move synchronously, a threading hole (4) penetrates through the surface of the upper top plate (201), an arc-shaped kidney-shaped groove (208) corresponding to the threading hole (4) penetrates through the surface of the lower top plate (202), pipelines sequentially penetrate through the threading hole (4) and the kidney-shaped groove (208) and then enter the outer cover (1), and reinforcing bodies (8) for increasing the structural strength of the kidney-shaped groove (208) and the lower top plate (202) are integrally formed at the edges of the kidney-shaped groove (208) and the lower top plate.

2. A rotation guard for use on a machine tool, according to claim 1, wherein: the reinforcing body (8) comprises a first convex edge (6) extending along the edge of the kidney-shaped groove (208).

3. A rotation guard for use on a machine tool according to claim 1 or 2, wherein: the reinforcing body (8) further comprises a second convex edge (5) extending along the edge of the lower top plate (202).

4. A rotation guard for use on a machine tool according to claim 3, wherein: the surface of the lower top plate (202) is integrally provided with an arc convex edge (7) used for enhancing the structural strength of the lower top plate (202).

5. A rotation guard for use on a machine tool, according to claim 1, wherein: the outer edge of roof (202) has radially set gradually first arc (10), convex waistband (13) from inside to outside along roof (202) down, first arc (10) with the bottom surface integrated into one piece of roof (202) down, first locking bolt (15) are installed to one side of first arc (10), first locking bolt (15) pass behind first arc (10) and screw hole (21) screw-thread fit on convex waistband (13), the top locking of convex door (3) is fixed in first locking bolt (15) with between convex waistband (13).

6. A rotation guard for use on a machine tool according to claim 5, wherein: and a fixing pin piece (22) which radially penetrates through the first arc-shaped plate (10) along the lower top plate (202) and is in positioning fit with a fixing groove (16) on the arc-shaped door (3) is arranged on one side of the first arc-shaped plate (10).

7. A rotation guard for use on a machine tool according to claim 6, wherein: one side of the arc-shaped waistband (13) facing the first arc-shaped plate (10) is fixedly provided with a protruding part (12), and a sealing cushion block (11) attached to the surface of the first arc-shaped plate (10) is arranged on the protruding part (12).

8. A rotation guard for use on a machine tool, according to claim 1, wherein: the outer cover (1) comprises an annular base (209) used for installing and placing an arc-shaped door (3), a second arc-shaped plate (17) extending along the circumferential direction of the outer cover (1) is placed on the surface of the annular base (209), an arc edge covering (20) is fixedly arranged on the outer side of the annular base (209), the bottom of the arc-shaped door (3) is located between the second arc-shaped plate (17) and the arc edge covering (20), and the second arc-shaped plate (17) is provided with a second locking bolt (18) which penetrates through the back of the second arc-shaped plate (17) and is in threaded fit with a locking hole (24) on the arc edge covering (20).

9. A rotation guard for use on a machine tool, according to claim 1, wherein: and a reverse top thread part which is abutted against the outer side surface of the second arc-shaped plate (17) is arranged on the inner side surface of the bottom of the arc-shaped edge covering (20).