CN112264690A

CN112264690A - Steel sheet flame cutting protector

Info

Publication number: CN112264690A
Application number: CN202011200612.7A
Authority: CN
Inventors: 王军
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-02
Filing date: 2020-11-02
Publication date: 2021-01-26

Abstract

The invention relates to the technical field of steel plate cutting, in particular to a steel plate flame cutting protection device which comprises a placement frame, a supporting mechanism, a cutting mechanism, a limiting mechanism, a first protection mechanism and a second protection mechanism, wherein the placement frame is provided with a support frame; when the cutting mechanism is used, the limiting mechanism is arranged at the top of the placing frame and inside the cutting mechanism, and the components are embedded through the corresponding spring clamping blocks and the rack clamping rods, so that a fault occurs in an electric control system of the cutting mechanism, the cutting mechanism can be conveniently limited and locked, and potential safety hazards are avoided; the first protection mechanism is arranged at one end of the cutting mechanism, and the cutting assembly is conveniently protected and shielded during flame cutting through the corresponding spring clamping assembly and the protection net cover; one side of cutting mechanism is located with second protection machanism, supports the pole subassembly through corresponding protection plate subassembly and spring to further conveniently play the effect that the protection was shielded to cutting assembly when flame cutting, guarantee flame cutting's safety more.

Description

Steel sheet flame cutting protector

Technical Field

The invention relates to the technical field of steel plate cutting, in particular to a steel plate flame cutting protection device.

Background

Flame cutting is a common way of rough machining of steel plates. Flame cutting, namely gas cutting, is traditionally performed by using acetylene gas, and later by using propane, natural gas cutting now occurs, and natural gas cutting becomes the first choice for flame cutting due to the characteristics of abundant natural gas reserves, low price, no pollution and the like. Natural gas additives are generally added in natural gas flame cutting to generate novel flame cutting gas, the cutting effect can be better by using the gas for flame cutting, the cutting efficiency is improved, and the cutting cost is reduced. In the practical application process, the flame cutting machine is a cutting device for cutting metal materials by using gas to distribute oxygen or gasoline to distribute oxygen.

However, in the actual use process, when an electric control system of the cutting assembly breaks down or the cutting assembly is temporarily suspended, the cutting assembly is easy to generate unstable factors, which affects the use safety; meanwhile, in the actual flame cutting process, a plurality of sparks are generated, so that the safety of a user is influenced to a certain extent.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a steel plate flame cutting protection device.

The technical scheme adopted by the invention for solving the technical problems is as follows: a steel plate flame cutting protection device comprises a placing frame, a supporting mechanism, a cutting mechanism, a limiting mechanism, a first protection mechanism and a second protection mechanism, the bottom of the placing frame for fixedly placing other mechanisms is provided with the supporting mechanism for supporting the whole device, the top of the placing frame is provided with the cutting mechanism for realizing flame cutting of the steel plate, the middle part of the top surface of the placing frame and the inside of the cutting mechanism are provided with the limiting mechanisms which are used for conveniently limiting and locking the cutting mechanism in a temporary state, the side wall of one end of the cutting mechanism is provided with the first protection mechanism which can conveniently play a certain protection role during flame cutting, the second protection mechanism is used for further playing a protection role in flame cutting and is arranged on one side of the placing frame and the cutting mechanism.

Specifically, the supporting mechanism comprises supporting plates, knobs, screw rods and roller seats, the supporting plates are fixed on two sides of the bottom of the placement frame respectively, the knobs are arranged on the tops of two sides of each supporting plate respectively, the screw rods are connected to the bottom ends of the knobs, the screw rods are in threaded connection with the insides of the roller seats, and the roller seats are clamped in the insides of the supporting plates.

Specifically, the cutting mechanism comprises a control box main body, sliders, an installation rod and a flame cutting gun head, the control box main body is arranged at the top of the placement frame, the sliders are fixed to two sides of the bottom of the control box main body respectively, the sliders are clamped to the placement frame, the installation rod is arranged inside the control box main body, and the flame cutting gun head is installed at one end of the installation rod.

Specifically, the limiting mechanism comprises a pressing handle, a rack, a first spring, a second spring, a first clamping block, a first clamping groove and a clamping rod, the rack is fixed in the middle of the top surface of the placing frame, the middle parts of two opposite sides of the control box main body are respectively clamped with the pressing handle, one end of the pressing handle extends into the control box main body and is connected with the clamping rod, the first spring is wound on the clamping rod, one end of the first spring is fixed on the clamping rod, the other end of the first spring is propped against the inner wall of the control box main body, the pressing handle is positioned in the control box body, the inner parts of the two opposite sides of one end of the pressing handle in the control box body are respectively connected with one second spring, the other end of the second spring is connected with the first clamping block which is pressed against the inner wall of the control box main body, and the two sides of the control box main body, which are positioned at the top of the first spring, are respectively provided with one first clamping groove.

Specifically, the first protection mechanism comprises a protection cover, a lantern ring, a third spring, a second clamping block, a sliding groove and a second clamping groove, the lantern ring is clamped on the side wall of the flame cutting gun head, the bottom of the lantern ring is fixed with the protection cover in a funnel shape, the third spring is fixed inside each of two opposite sides of the inner wall of the lantern ring, the other end of the third spring is connected with the second clamping block, the second clamping block is clamped in the sliding groove formed in the side wall of the flame cutting gun head, and the second clamping groove is formed in the inner wall of the bottom end of the sliding groove.

Specifically, the second protection mechanism comprises a protection plate, a protection pad, a storage tank, a pressed block, a connecting rod, a fourth spring, a support rod, a through pipe and a pressure rod, the protection plate is fixed on one side of one end of the control box main body, the protection pad is arranged inside one side of the protection plate, the storage tank is fixed on the top of one side of the protection plate, which is far away from the flame cutting gun head, the pressed block with a right trapezoid-angle cross section is clamped inside the top of the storage tank, which faces one side of the installation rod, the pressed block is connected with a plurality of connecting rods, the other end of each connecting rod is connected with the fourth spring, the other end of each fourth spring is fixed on the inner wall of the storage tank, the support rod is connected on one side of the connecting rod, which is close to the fourth spring, the support rod is connected with the support rod, the cross section of the support rod is, it is a plurality of to support the pole to be located the inside length difference of siphunculus, the siphunculus is fixed in the inside of guard plate and communicate in the protection fills up, the installation pole is close to one side of guard plate is connected with the depression bar, the depression bar with the piece that receives is located same height.

The invention has the beneficial effects that:

(1) when the steel plate flame cutting protection device is used, the limiting mechanism is arranged at the top of the mounting frame and inside the cutting mechanism, and the components are embedded through the corresponding spring clamping blocks and the rack clamping rods, so that when an electric control system of the cutting mechanism breaks down or the cutting mechanism is temporarily stopped, the limiting and locking effects on the cutting mechanism can be conveniently achieved, and potential safety hazards are avoided; namely: when control box main part broke down or temporarily carried out the pause to the flame cutting rifle head, the user can be manual presses the handle, make the handle of pressing at the inside removal of control box main part, it removes together to drive the kelly, first spring is compressed simultaneously, until making the position that first fixture block removed to first draw-in groove, this moment under the effect of second spring, will make first fixture block advance first draw-in groove, the kelly just can inlay mutually with the rack simultaneously just, thereby break down at the electrical system of control box main part, or when temporarily carrying out the pause to the control box main part, make and to conveniently play spacing locking's effect to cutting mechanism, avoid producing the potential safety hazard.

(2) When the flame cutting protection device for the steel plate is used, the first protection mechanism is arranged at one end of the cutting mechanism, and the cutting mechanism is conveniently protected and shielded by the corresponding spring clamping component and the protection net cover during flame cutting, so that spark splashing is avoided, and safety of flame cutting is ensured; namely: when the actual cutting, the user can promote the lantern ring in advance, and the lantern ring removes and drives the protection casing and remove, and when the inside second fixture block of the lantern ring removed the position to the second draw-in groove, the second fixture block will block to the second draw-in groove under the effect of third spring, conveniently removed the protection casing to suitable position to conveniently play the effect that the protection was shielded to cutting assembly when flame cutting, avoid the spark to spatter everywhere, make the security that can guarantee flame cutting.

(3) When the flame cutting protection device for the steel plate is used, the second protection mechanism is arranged on one side of the cutting mechanism, and the protection plate component and the spring support rod component are correspondingly arranged, so that the cutting component is further conveniently protected and shielded during flame cutting, spark splashing is avoided, and safety of flame cutting is ensured; namely: when actual flame cutting, the guard plate can remove along with the removal of control box main part, thereby play the effect of protection to flame cutting, it is further, along with the removal of installation pole, when driving flame cutting rifle head and removing, still can drive the depression bar and remove simultaneously, along with the removal of depression bar, will conflict the extrusion to the piece of being pressed gradually, receive the extrusion back when the piece of being pressed, the meeting drives the connecting rod simultaneously and removes, the fourth spring produces the shrink, the connecting rod removes to drive and supports the pole and remove together, thereby make a plurality of support poles all break away from the inside constraint of siphunculus gradually, make the inside infiltration liquid of depositing in advance of storage tank progressively soak to the inside of protection pad through the siphunculus, thereby make the guard plate can further play the effect that the protection was shielded to flame cutting, avoid the spark to spatter, make the security that can guarantee flame cutting.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a structural diagram illustrating the overall structure of a preferred embodiment of the flame cutting guard for steel plates according to the present invention;

FIG. 2 is a schematic structural view of the support mechanism shown in FIG. 1;

FIG. 3 is a schematic view of a connection structure between the cutting mechanism and the limiting mechanism shown in FIG. 1;

FIG. 4 is a schematic view of a connection structure of the cutting mechanism and the first protection mechanism shown in FIG. 1;

FIG. 5 is a schematic structural view of the second shielding mechanism shown in FIG. 1;

FIG. 6 is a schematic view of the connection structure between the rod and the tube shown in FIG. 1;

FIG. 7 is an enlarged view of the part A shown in FIG. 1;

fig. 8 is an enlarged view of the structure of the portion B shown in fig. 3.

In the figure: 1. the flame cutting device comprises a placement frame, 2, a supporting mechanism, 21, a support plate, 22, a knob, 23, a screw rod, 24, a roller seat, 3, a cutting mechanism, 31, a control box main body, 32, a sliding block, 33, an installation rod, 34, a flame cutting gun head, 4, a limiting mechanism, 41, a pressing handle, 42, a rack, 43, a first spring, 44, a second spring, 45, a first clamping block, 46, a first clamping groove, 47, a clamping rod, 5, a first protection mechanism, 51, a protection cover, 52, a sleeve ring, 53, a third spring, 54, a second clamping block, 55, a sliding groove, 56, a second clamping groove, 6, a second protection mechanism, 61, a protection plate, 62, a protection pad, 63, a storage box, 64, a compression block, 65, a connecting rod, 66, a fourth spring, 67, a support rod, 68, a through pipe, 69 and a compression rod.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1-8, the steel plate flame cutting protection device of the present invention includes a placement frame 1, a supporting mechanism 2, a cutting mechanism 3, a limiting mechanism 4, a first protection mechanism 5 and a second protection mechanism 6, wherein the bottom of the placement frame 1 for fixedly placing other mechanisms is provided with the supporting mechanism 2 for supporting the whole device, the top of the placement frame 1 is provided with the cutting mechanism 3 for realizing flame cutting of a steel plate, the middle of the top surface of the placement frame 1 and the inside of the cutting mechanism 3 are provided with the limiting mechanism 4 for conveniently limiting and locking the cutting mechanism 3 in a temporary state, the side wall of one end of the cutting mechanism 3 is provided with the first protection mechanism 5 for conveniently playing a certain protection role in flame cutting, and one side of the placement frame 1 and the cutting mechanism 3 is provided with a device for further playing a protection role in flame cutting And a second guard mechanism 6.

Specifically, the supporting mechanism 2 comprises a supporting plate 21, knobs 22, screws 23 and roller seats 24, wherein one supporting plate 21 is fixed on each of two sides of the bottom of the placement frame 1, one knob 22 is arranged on each of the tops of two sides of the supporting plate 21, the screw 23 is connected to the bottom end of each knob 22, the screw 23 is connected to the inside of the roller seat 24 in a threaded manner, and the roller seats 24 are clamped inside the supporting plates 21; when the positioning frame is used, a user can manually rotate the knob 22, the knob 22 rotates to drive the screw 23 to rotate, the roller seat 24 continuously moves up and down in the support plate 21 along with the rotation of the screw 23 until the bottom end of the roller seat 24 abuts against the ground, and therefore the positioning frame 1 is finally convenient to move.

Specifically, the cutting mechanism 3 comprises a control box main body 31, sliders 32, mounting rods 33 and flame cutting gun heads 34, the control box main body 31 is arranged at the top of the placement frame 1, the sliders 32 are respectively fixed to two sides of the bottom of the control box main body 31, the sliders 32 are clamped to the placement frame 1, the mounting rods 33 are arranged inside the control box main body 31, and the flame cutting gun heads 34 are mounted at one ends of the mounting rods 33; in actual operation, a user can firstly move the control box main body 31 to a required proper position through the sliding block 32, and then manually perform corresponding operation on the control box main body 31, so that the control box main body 31 can conveniently control the movement of the mounting rod 33, further conveniently control the movement of the flame cutting gun head 34, and the flame cutting gun head 34 can conveniently perform corresponding flame cutting on a steel plate.

Specifically, the limiting mechanism 4 includes a pressing handle 41, a rack 42, a first spring 43, a second spring 44, a first clamping block 45, a first clamping groove 46 and a clamping rod 47, the rack 42 is fixed in the middle of the top surface of the placement frame 1, the middle portions of the two opposite sides of the control box main body 31 are respectively clamped with one pressing handle 41, one end of the pressing handle 41 extends into the control box main body 31 and is connected with the clamping rod 47, the first spring 43 is wound on the clamping rod 47, one end of the first spring 43 is fixed to the clamping rod 47, the other end of the first spring 43 abuts against the inner wall of the control box main body 31, the pressing handle 41 is located inside the two opposite sides of one end of the control box main body 31 and is connected with one second spring 44, the other end of the second spring 44 is connected with the first clamping block 45, the first clamping block 45 abuts against the inner wall of the control box main body 31, two first clamping grooves 46 are respectively formed in the control box main body 31 at two sides of the top of the first spring 43; when the cutting mechanism is used, the limiting mechanism 4 is arranged at the top of the placing frame 1 and inside the cutting mechanism 3, and the corresponding spring clamping blocks and the rack clamping rod embedded components are used, so that when an electric control system of the cutting mechanism 3 breaks down or the cutting mechanism 3 is temporarily stopped, the limiting and locking effects on the cutting mechanism 3 can be conveniently realized, and potential safety hazards are avoided; namely: when the control box main body 31 fails or the flame cutting torch head 34 is temporarily stopped, a user can manually press the pressing handle 41 to enable the pressing handle 41 to move inside the control box main body 31 to drive the clamping rod 47 to move together, the first spring 43 is compressed at the same time until the first clamping block 45 moves to the position of the first clamping groove 46, at the moment, under the action of the second spring 44, the first clamping block 45 is clamped into the first clamping groove 46, and meanwhile, the clamping rod 47 is embedded with the rack 42, so that an electric control system of the control box main body 31 fails or the control box main body 31 is temporarily stopped, the cutting mechanism 3 can be conveniently limited and locked, and potential safety hazards are avoided.

Specifically, the first protection mechanism 5 includes a protection cover 51, a collar 52, a third spring 53, a second fixture block 54, a sliding groove 55 and a second fixture groove 56, the collar 52 is clamped on the side wall of the flame cutting torch head 34, the protection cover 51 in a funnel shape is fixed at the bottom of the collar 52, the third spring 53 is fixed inside each of two opposite sides of the inner wall of the collar 52, the second fixture block 54 is connected to the other end of the third spring 53, the second fixture block 54 is clamped in the sliding groove 55 formed in the side wall of the flame cutting torch head 34, and the second fixture groove 56 is formed in the inner wall of the bottom end of the sliding groove 55; when the flame cutting device is used, the first protection mechanism 5 is arranged at one end of the cutting mechanism 3, and the cutting mechanism 3 is conveniently protected and shielded by the corresponding spring clamping component and the protection net cover during flame cutting, so that spark splashing is avoided, and safety of flame cutting is ensured; namely: when the cutting is actually performed, a user can push the sleeve ring 52 in advance, the sleeve ring 52 moves to drive the protective cover 51 to move, when the second clamping block 54 in the sleeve ring 52 moves to the position of the second clamping groove 56, the second clamping block 54 is clamped to the second clamping groove 56 under the action of the third spring 53, the protective cover 51 is conveniently moved to a proper position, so that the cutting assembly 3 is conveniently protected and shielded during flame cutting, sparks are prevented from being splashed, and safety of flame cutting is ensured.

Specifically, the second protection mechanism 6 includes a protection plate 61, a protection pad 62, a storage tank 63, a pressure block 64, a connecting rod 65, a fourth spring 66, a resisting rod 67, a through pipe 68 and a pressure rod 69, the protection plate 61 is fixed on one side of one end of the control tank main body 31, the protection pad 62 is arranged inside one side of the protection plate 61, the storage tank 63 is fixed on the top of one side of the protection plate 61 away from the flame cutting torch head 34, the pressure block 64 with a right trapezoid-shaped cross section is clamped inside the top of the storage tank 63 facing one side of the mounting rod 33, one side of the pressure block 64 facing the inside of the storage tank 63 is connected with a plurality of connecting rods 65, the other end of each connecting rod 65 is connected with the fourth spring 66, the other end of the fourth spring 66 is fixed on the inner wall of the storage tank 63, and one side of each connecting rod 65 close to the fourth spring 66 is connected with the, the cross section of the abutting rod 67 is in an L shape, the bottom end of the abutting rod 67 is clamped with the through pipe 68, the lengths of the abutting rods 67 in the through pipe 68 are different, the through pipe 68 is fixed in the protection plate 61 and is communicated with the protection pad 62, one side of the mounting rod 33 close to the protection plate 61 is connected with the pressing rod 69, and the pressing rod 69 and the pressed block 64 are located at the same height; when the flame cutting device is used, the second protection mechanism 6 is arranged on one side of the cutting mechanism 3, and the corresponding protection plate component and the spring support rod component are used, so that the cutting component 3 is further conveniently protected and shielded during flame cutting, spark splashing is avoided, and safety of flame cutting is further ensured; namely: during actual flame cutting, the protection plate 61 moves along with the movement of the control box main body 31, so as to play a role in protecting flame cutting, further, along with the movement of the mounting rod 33, the flame cutting torch head 34 is driven to move, the pressure rod 69 is driven to move simultaneously, along with the movement of the pressure rod 69, the pressure block 64 is gradually pressed against, after the pressure block 64 is pressed, the connecting rod 65 is simultaneously driven to move, the fourth spring 66 contracts, the connecting rod 65 moves to drive the abutting rods 67 to move together, so that the abutting rods 67 are gradually separated from the constraint inside of the through pipe 68, the wetting liquid stored in the storage tank 63 in advance is gradually wetted into the protection pad 62 through the through pipe 68, and the protection plate 61 can further play a role in protecting and shielding flame cutting, the spark is prevented from splashing, so that the safety of flame cutting is ensured.

When the invention is used, firstly, a user can manually rotate the knob 22, the knob 22 rotates to drive the screw 23 to rotate, the roller seat 24 continuously moves up and down in the support plate 21 along with the rotation of the screw 23 until the bottom end of the roller seat 24 is abutted against the ground, thereby finally facilitating the movement of the placing frame 1; in actual operation, a user can firstly move the control box main body 31 to a required proper position through the sliding block 32, then manually carry out corresponding operation on the control box main body 31, so that the control box main body 31 is convenient for controlling the movement of the mounting rod 33, further convenient for controlling the movement of the flame cutting gun head 34, and convenient for the flame cutting gun head 34 to carry out corresponding flame cutting on a steel plate; when the control box main body 31 fails or the flame cutting gun head 34 is temporarily suspended, a user can manually press the pressing handle 41 to enable the pressing handle 41 to move inside the control box main body 31 to drive the clamping rod 47 to move together, the first spring 43 is compressed at the same time until the first clamping block 45 moves to the position of the first clamping groove 46, at the moment, under the action of the second spring 44, the first clamping block 45 is clamped into the first clamping groove 46, and meanwhile, the clamping rod 47 is embedded with the rack 42, so that when an electric control system of the control box main body 31 fails or the control box main body 31 is temporarily suspended, the cutting mechanism 3 can be conveniently limited and locked, and potential safety hazards are avoided; when in actual cutting, a user can push the lantern ring 52 in advance, the lantern ring 52 moves to drive the protective cover 51 to move, when the second fixture block 54 in the lantern ring 52 moves to the position of the second clamping groove 56, the second fixture block 54 is clamped to the second clamping groove 56 under the action of the third spring 53, the protective cover 51 is conveniently moved to a proper position, so that the protective cover can conveniently protect and shield the cutting assembly 3 during flame cutting, spark splashing is avoided, and safety of flame cutting is guaranteed; further, the shielding plate 61 is moved along with the movement of the control box main body 31, thereby providing a shielding effect against flame cutting, and further, along with the movement of the mounting rod 33, the flame cutting torch head 34 is driven to move, the pressure rod 69 is also driven to move simultaneously, the pressure block 64 is gradually pressed against and extruded along with the movement of the pressure rod 69, when the pressed block 64 is pressed, the connecting rod 65 is driven to move, the fourth spring 66 contracts, the connecting rod 65 moves to drive the abutting rod 67 to move together, thereby gradually separating the plurality of resisting rods 67 from the constraint of the through pipe 68, gradually infiltrating the infiltrating liquid stored in the storage tank 63 into the protective pad 62 through the through pipe 68, therefore, the protection plate 61 can further play a role in protecting and shielding the flame cutting, spark splashing is avoided, and safety of the flame cutting is ensured.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The steel plate flame cutting protection device is characterized by comprising a placement frame (1), a supporting mechanism (2), a cutting mechanism (3), a limiting mechanism (4), a first protection mechanism (5) and a second protection mechanism (6), wherein the supporting mechanism (2) used for supporting the whole device is arranged at the bottom of the placement frame (1) for fixedly placing other mechanisms, the cutting mechanism (3) used for realizing flame cutting of a steel plate is arranged at the top of the placement frame (1), the limiting mechanism (4) used for conveniently limiting and locking the cutting mechanism (3) in a temporary state is arranged in the middle of the top surface of the placement frame (1) and in the cutting mechanism (3), the first protection mechanism (5) used for conveniently playing a certain protection role in flame cutting is arranged on the side wall of one end of the cutting mechanism (3), one side of the placing frame (1) and the cutting mechanism (3) is provided with a second protection mechanism (6) which is used for further playing a protection role in flame cutting.

2. A steel plate flame cutting guard as claimed in claim 1, wherein: the supporting mechanism (2) comprises supporting plates (21), knobs (22), screw rods (23) and roller seats (24), the supporting plates (21) are fixed on two sides of the bottom of the placement frame (1) respectively, the knobs (22) are arranged on the tops of two sides of each supporting plate (21), the screw rods (23) are connected to the bottom ends of the knobs (22), the screw rods (23) are in threaded connection with the insides of the roller seats (24), and the roller seats (24) are clamped in the insides of the supporting plates (21).

3. A steel plate flame cutting guard as claimed in claim 1, wherein: cutting mechanism (3) are including control box main part (31), slider (32), installation pole (33) and flame cutting rifle head (34), the top of arrangement frame (1) is equipped with control box main part (31), the both sides of control box main part (31) bottom are fixed with one respectively slider (32), slider (32) block in arrangement frame (1), the inside of control box main part (31) is equipped with installation pole (33), install the one end of installation pole (33) flame cutting rifle head (34).

4. A steel plate flame cutting guard as claimed in claim 3, wherein: the limiting mechanism (4) comprises a pressing handle (41), a rack (42), a first spring (43), a second spring (44), a first clamping block (45), a first clamping groove (46) and a clamping rod (47), the rack (42) is fixed in the middle of the top surface of the placement frame (1), the middle parts of two opposite sides of the control box main body (31) are respectively clamped with the pressing handle (41), one end of the pressing handle (41) extends into the control box main body (31) and is connected with the clamping rod (47), the first spring (43) is wound on the clamping rod (47), one end of the first spring (43) is fixed on the clamping rod (47), the other end of the first spring (43) abuts against the inner wall of the control box main body (31), the insides of two opposite sides of one end of the pressing handle (41) in the control box main body (31) are respectively connected with the second spring (44), the other end of the second spring (44) is connected with the first clamping block (45), the first clamping block (45) abuts against the inner wall of the control box main body (31), and the two sides of the top of the first spring (43) inside the control box main body (31) are respectively provided with one first clamping groove (46).

5. A steel plate flame cutting guard as claimed in claim 3, wherein: the first protection mechanism (5) comprises a protection cover (51), a lantern ring (52), a third spring (53), a second clamping block (54), a sliding groove (55) and a second clamping groove (56), the lantern ring (52) is clamped on the side wall of the flame cutting gun head (34), the bottom of the lantern ring (52) is fixed with the protection cover (51) in a funnel shape, the third spring (53) is fixed inside each of two opposite sides of the inner wall of the lantern ring (52), the other end of the third spring (53) is connected with the second clamping block (54), the second clamping block (54) is clamped in the sliding groove (55) formed in the side wall of the flame cutting gun head (34), and the second clamping groove (56) is formed in the inner wall of the bottom end of the sliding groove (55).

6. A steel plate flame cutting guard as claimed in claim 3, wherein: the second protection mechanism (6) comprises a protection plate (61), a protection pad (62), a storage tank (63), a pressure block (64), a connecting rod (65), a fourth spring (66), a support rod (67), a through pipe (68) and a pressure rod (69), wherein the protection plate (61) is fixed on one side of one end of the control tank main body (31), the protection pad (62) is arranged inside one side of the protection plate (61), the storage tank (63) is fixed on the top of one side, deviating from the flame cutting gun head (34), of the protection plate (61), the pressure block (64) with a right-angled trapezoid-shaped cross section is clamped inside the top of the storage tank (63) and faces one side of the installation rod (33), the pressure block (64) faces one side inside the storage tank (63) and is connected with the connecting rods (65), and the other end of the connecting rod (65) is connected with the fourth spring (66), the other end of fourth spring (66) is fixed in on the inner wall of storage tank (63), just connecting rod (65) are close to one side of fourth spring (66) is connected with support rod (67), just the cross-section of support rod (67) is the L form, the bottom block of support rod (67) in siphunculus (68), it is a plurality of support rod (67) are located the inside length difference of siphunculus (68), siphunculus (68) are fixed in the inside of guard plate (61) and communicate in protective pad (62), installation pole (33) are close to one side of guard plate (61) is connected with depression bar (69), depression bar (69) with it is located same height to receive piece (64).