阅读说明：本技术 一种用于大型油缸缸底的焊前预热装置 (Pre-welding preheating device for bottom of large oil cylinder ) 是由 舒浩宇 王安 于 2021-08-10 设计创作，主要内容包括：本发明公开了一种用于大型油缸缸底的焊前预热装置,包括加热箱体、燃气罐、加热机构和收纳机构,所述燃气罐固定安装于加热箱体的内部下端,所述加热机构固定安装于加热箱体的前端外表面,所述收纳机构固定安装于加热箱体的内部中间位置；加热机构包括固定杆、固定座、环形槽、限位槽、加热管和进气管,所述固定杆固定安装于加热箱体的前端外表面上下两端,所述固定座固定安装于固定杆的前端外表面之间,该装置通过推动限位杆来调节加热环的位置,从而使燃烧喷嘴可以更加充分均匀的对大型油缸缸底焊接处进行预热处理,且便于调节；通过弹性带连接套管,从而使燃气管收纳在套管上,并可以自由调节,且不易损坏。(The invention discloses a pre-welding preheating device for a large oil cylinder bottom, which comprises a heating box body, a gas tank, a heating mechanism and a receiving mechanism, wherein the gas tank is fixedly arranged at the lower end inside the heating box body; the heating mechanism comprises a fixed rod, a fixed seat, an annular groove, a limiting groove, a heating pipe and an air inlet pipe, wherein the fixed rod is fixedly arranged at the upper end and the lower end of the outer surface of the front end of the heating box body; through elastic band adapter sleeve to make the gas pipe accomodate on the sleeve pipe, and can freely adjust, and not fragile.)

1. The utility model provides a weld preheating device before for large-scale hydro-cylinder bottom which characterized in that: the gas heating device comprises a heating box body (1), a gas tank (11), a heating mechanism (2) and a containing mechanism (3), wherein the gas tank (11) is fixedly arranged at the lower end of the interior of the heating box body (1), the heating mechanism (2) is fixedly arranged on the outer surface of the front end of the heating box body (1), and the containing mechanism (3) is fixedly arranged in the middle position of the interior of the heating box body (1); the heating mechanism (2) comprises a fixing rod (21), a fixing seat (22), an annular groove (23), a limiting groove (24), a heating pipe (25) and an air inlet pipe (26), wherein the fixing rod (21) is fixedly arranged at the upper end and the lower end of the outer surface of the front end of the heating box body (1), the fixing seat (22) is fixedly arranged between the outer surfaces of the front ends of the fixing rod (21), the annular groove (23) is arranged at the front end of the outer surface of one side of the fixing seat (22), the limiting groove (24) is uniformly arranged at the rear end of the outer surface of one side of the fixing seat (22), the heating pipe (25) is movably arranged in the annular groove (23), the air inlet pipe (26) is fixedly arranged at the middle position of the rear end of the heating pipe (25), a combustion nozzle (251) is uniformly arranged in the radial direction of the heating pipe (25), and a fixing frame (261) is fixedly arranged at the front end of the outer surface of the upper end of the air inlet pipe (26), the utility model discloses a fixing base, including mount (261), run through gag lever post (262) in mount (261), one side fixed mounting that the surface of gag lever post (262) is close to fixing base (22) has spacing dish (2621), fixed mounting has spring (2622) between spacing dish (2621) and mount (261).

2. The pre-weld preheating device for the cylinder bottom of the large-sized oil cylinder according to claim 1, which is characterized in that: the corner positions of the outer surface of the lower end of the heating box body (1) are fixedly provided with adjustable lifting trundles (13).

3. The pre-weld preheating device for the cylinder bottom of the large-sized oil cylinder according to claim 1, which is characterized in that: both ends all are provided with baffle (252) about one side surface of fixing base (22), the front end of heating pipe (25) is provided with pulse ignition ware (253) and temperature sensor (254).

4. The pre-weld preheating device for the cylinder bottom of the large-sized oil cylinder according to claim 1, which is characterized in that: receiving mechanism (3) include fixed axle (31), sleeve pipe (32), fixed disk (33), elastic webbing (34) and gas pipe (35), fixed axle (31) fixed mounting is in heating box (1), sleeve pipe (32) cup joint on fixed axle (31), fixed disk (33) cup joint in sleeve pipe (32) surface both sides, elastic webbing (34) fixed mounting is between the upper end surface of the inside rear end of heating box (1) and sleeve pipe (32), gas pipe (35) twine on sleeve pipe (32) and are located between two fixed disks (33).

5. The pre-weld preheating device for the cylinder bottom of the large-sized oil cylinder according to claim 4, characterized in that: the sleeve (32) can rotate on the fixed shaft (31), and the position of the fixed disc (33) can be adjusted according to the winding number of the gas pipe (35).

6. The pre-weld preheating device for the cylinder bottom of the large-sized oil cylinder according to claim 1, which is characterized in that: the air inlet pipe (26) is horn-shaped, the rear end pipe diameter of the air inlet pipe (26) is larger than that of the front end, and rubber layers are arranged at the rear end of the air inlet pipe (26).

7. The pre-weld preheating device for the cylinder bottom of the large-sized oil cylinder according to claim 4, characterized in that: heating box (1) right side wall fixed mounting have with gas pipe (35) assorted guiding mechanism (12), guiding mechanism (12) are including outer axle sleeve (121), interior axle sleeve (122), sealing washer (123) and oil storage bottle (124), fixed connection between outer axle sleeve (121) and heating box (1) lateral wall, outer axle sleeve (121) internal rotation installs interior axle sleeve (122), outer axle sleeve (121) both sides opening part and interior axle sleeve (122) contact position department equal fixed mounting have sealing washer (123), outer axle sleeve (121) top fixed mounting has oil storage bottle (124), be provided with between outer axle sleeve (121) and interior axle sleeve (122) lubricating oil (126), passageway (125) have been seted up at interior axle sleeve (122) middle part, gas pipe (35) run through the setting inside passageway (125).

Technical Field

The invention relates to the field of pre-welding preheating, in particular to a pre-welding preheating device for a large-scale oil cylinder bottom.

Background

Pre-heating before welding is a process measure for heating the welded part locally and wholly properly before welding. The method aims to reduce the cooling speed of a welding joint, avoid the generation of a hardening structure and reduce the welding stress and deformation, and is an effective method for preventing the generation of welding cracks.

In the process of implementing the invention, the following problems in the prior art are found to be at least not solved: 1. when preheating before welding large-scale hydro-cylinder end, need the workman to use roast rifle for a long time to preheat cylinder end welding area, this has not only promoted workman's intensity of labour, workman's work enthusiasm has been reduced, also can appear preheating the not enough even abundant condition in the case of using handheld roast rifle to preheat, and adjust inconveniently, 2, when preheating before welding large-scale hydro-cylinder end, the gas pipe is shelved on the ground at will, cause the extrusion of gas pipe to break easily, thereby lead to the gas to leak, cause the incident, the winding also can be caused to the gas pipe overlength, can cause the damage to the body equally.

Therefore, a pre-welding preheating device for the bottom of a large oil cylinder is provided.

Disclosure of Invention

The invention aims to provide a pre-welding preheating device for the cylinder bottom of a large-sized oil cylinder, which adjusts the position of a heating ring by pushing a limiting rod, so that a combustion nozzle can fully and uniformly preheat the welding position of the cylinder bottom of the large-sized oil cylinder and is convenient to adjust; through elastic band adapter sleeve to make the gas pipe accomodate on the sleeve pipe, and can freely adjust, and not fragile, in order to solve the problem that proposes among the above-mentioned background art.

The invention provides a pre-welding preheating device for a large oil cylinder bottom, which comprises a heating box body, a gas tank, a heating mechanism and a receiving mechanism, wherein the gas tank is fixedly arranged at the lower end inside the heating box body; heating mechanism includes dead lever, fixing base, ring channel, spacing groove, heating pipe and intake pipe, both ends about dead lever fixed mounting is in the front end surface of heating box, fixing base fixed mounting is between the front end surface of dead lever, one side surface front end at the fixing base is seted up to the ring channel, one side surface rear end at the fixing base is evenly seted up to the spacing groove, heating pipe movable mounting is in the ring channel, intake pipe fixed mounting is in the rear end intermediate position of heating pipe, the footpath of heating pipe evenly installs combustion nozzle, the upper end surface front end fixed mounting of intake pipe has the mount, it has the gag lever post to run through in the mount, one side fixed mounting that the surface of gag lever post is close to the fixing base has spacing dish, fixed mounting has the spring between spacing dish and the mount.

By adopting the technical scheme, firstly, the heating mechanism is adjusted to the position corresponding to the welding position of the cylinder bottom of the oil cylinder by adjusting the adjustable lifting caster on the heating box body, then the limiting rod is pulled to enable the limiting disc to extrude the spring along with the movement of the limiting rod, the limiting rod is separated from the limiting groove and then pushed to move, the limiting rod drives the air inlet pipe to move, the air inlet pipe drives the heating pipe to slide in the annular groove, thereby adjusting the position of the combustion nozzle, when the combustion nozzle is adjusted to the required position, the limiting rod is slowly loosened, the limiting rod is clamped in the limiting groove under the action of the elastic force of the spring, thereby enabling the heating pipe to preheat the welding position of the cylinder bottom of the oil cylinder, achieving convenient adjustment and more uniform and sufficient preheating effect, then the gas tank is opened to enable the gas to enter the heating pipe through the gas pipe, and then the gas sprayed out from the combustion nozzle is ignited by controlling the pulse igniter, thereby preheat the welding department, monitor the preheating temperature of welding department through temperature sensor to preheating temperature in time makes the regulation.

Preferably, the corner positions of the outer surface of the lower end of the heating box body are fixedly provided with adjustable lifting trundles.

Through adopting above-mentioned technical scheme, the height of heating box can be adjusted to adjustable lifting foot wheel to adjust the position of heating pipe, and make things convenient for the removal of heating box.

Preferably, both ends all are provided with the baffle about one side surface of fixing base, the front end of heating pipe is provided with pulse ignition ware and temperature sensor.

Through adopting above-mentioned technical scheme, the baffle that both ends all were provided with about one side surface of fixing base makes the heating pipe slide in the ring channel, prevents the heating pipe roll-off ring channel, has protected heating pipe and gas pipe, and pulse igniter is used for lighting the gas, and temperature sensor is used for monitoring preheating temperature.

Preferably, the accommodating mechanism comprises a fixed shaft, a sleeve, a fixed disc, an elastic belt and a fuel gas pipe, the fixed shaft is fixedly installed in the heating box body, the sleeve is sleeved on the fixed shaft, the fixed disc is sleeved on two sides of the outer surface of the sleeve, the elastic belt is fixedly installed between the inner rear end of the heating box body and the outer surface of the upper end of the sleeve, and the fuel gas pipe is wound on the sleeve and located between the two fixed discs.

Through adopting above-mentioned technical scheme, when removing the heating pipe, the gas pipe can follow the removal of intake pipe and remove to make the winding take out from guiding mechanism at the epaxial gas pipe of sleeve pipe, the removal of gas pipe drives sheathed tube rotation, thereby make the elastic webbing winding on the sleeve pipe, under the effect of elastic webbing elasticity, make the gas pipe can twine on the sleeve pipe always, both protected the gas pipe not destroyed by external environment, also prevented the winding of gas pipe self, accomplished flexible orderly.

Preferably, the sleeve can rotate on the fixed shaft, and the position of the fixed disc can be adjusted according to the winding turns of the gas pipe.

Through adopting above-mentioned technical scheme, the sleeve pipe can rotate on the fixed axle, is convenient for realize accomodating of gas pipe, and the position of fixed disk can be adjusted according to the winding number of turns of gas pipe, prevents gas pipe slippage sleeve pipe, and sheathed tube cast structure makes gas pipe winding above also can not damage.

Preferably, the intake pipe is loudspeaker form, the rear end pipe diameter of intake pipe is greater than the front end pipe diameter, and the rear end of intake pipe all is equipped with the rubber layer.

Through adopting above-mentioned technical scheme, the intake pipe shape is loudspeaker form, and loudspeaker column structure has reduced the friction loss of gas pipe when the intake pipe contact, and the rear end of intake pipe is equipped with the better friction loss that has reduced of rubber layer.

Preferably, heating box right side wall fixed mounting have with gas pipe assorted guiding mechanism, guiding mechanism includes outer axle sleeve, interior axle sleeve, sealing washer and oil storage bottle, fixed connection between outer axle sleeve and the heating box lateral wall, the inside rotation of outer axle sleeve installs interior axle sleeve, outer axle sleeve both sides opening part and the equal fixed mounting of interior axle sleeve position of contact department have the sealing washer, outer axle sleeve top fixed mounting has the oil storage bottle, be provided with lubricating oil between outer axle sleeve and the interior axle sleeve, the passageway has been seted up at interior axle sleeve middle part, the gas pipe runs through the setting inside the passageway.

Through adopting above-mentioned technical scheme, when the in-process of adjusting the position of burning nozzle, just can stimulate the gas pipe and remove along in the passageway, at this in-process, because the angle deflection can take place for the heating pipe, consequently the gas pipe can drive the inside rotation of axle sleeve in the outer axle sleeve, make the angle deflection take place between interior axle sleeve and the outer axle sleeve between the two, thereby can effectually prevent to take place the looks mutual friction because of the angle problem between gas pipe and the passageway, and then prevent to lead to the fact the wearing and tearing loss to the gas pipe surface, effectual protection gas pipe surface can not receive the scratch.

Compared with the prior art, the invention has the beneficial effects that:

1. the position of the heating ring is adjusted by controlling the state of the limiting rod, so that the combustion nozzle can perform preheating treatment on the welding position of the cylinder bottom of the large-sized oil cylinder more fully and uniformly, the adjustment is convenient, the preheating effect is more uniform and sufficient, and the working strength of workers is reduced.

2. Connect on the sleeve pipe through the elastic webbing for under the effect of elastic webbing elasticity, make the gas pipe can twine on the sleeve pipe always, accomplished flexible orderly, both protected the gas pipe not destroyed by external environment, also prevented the winding of gas pipe self.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a structural view of the present invention;

FIG. 2 is a view of the combination of the limiting rod and the fixing frame of the present invention;

FIG. 3 is a structural view of the receiving mechanism of the present invention;

FIG. 4 is a cross-sectional view of a heating chamber of the present invention;

fig. 5 is a cross-sectional view of the guide mechanism of the present invention.

Description of reference numerals:

1. heating the box body; 11. a gas tank; 12. a guide mechanism; 121. an outer sleeve; 122. an inner sleeve; 123. a seal ring; 124. an oil storage bottle; 125. a channel; 126. lubricating oil; 13. an adjustable lifting caster; 2. a heating mechanism; 21. fixing the rod; 22. a fixed seat; 23. an annular groove; 24. a limiting groove; 25. heating a tube; 251. a combustion nozzle; 252. a baffle plate; 253. a pulse igniter; 254. a temperature sensor; 26. an air inlet pipe; 261. a fixed mount; 262. a limiting rod; 2621. a limiting disc; 2622. a spring; 3. a storage mechanism; 31. a fixed shaft; 32. a sleeve; 33. fixing the disc; 34. an elastic band; 35. a gas pipe.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 5, the present invention provides a pre-weld preheating device for a large-sized cylinder bottom, which comprises:

a pre-welding preheating device for the bottom of a large oil cylinder comprises a heating box body 1, a gas tank 11, a heating mechanism 2 and a receiving mechanism 3, wherein the gas tank 11 is fixedly arranged at the lower end of the inside of the heating box body 1, the heating mechanism 2 is fixedly arranged on the outer surface of the front end of the heating box body 1, and the receiving mechanism 3 is fixedly arranged at the middle position of the inside of the heating box body 1; the heating mechanism 2 comprises a fixed rod 21, a fixed seat 22, an annular groove 23, a limit groove 24, a heating pipe 25 and an air inlet pipe 26, wherein the fixed rod 21 is fixedly arranged at the upper end and the lower end of the outer surface of the front end of the heating box body 1, the fixed seat 22 is fixedly arranged between the outer surfaces of the front ends of the fixed rod 21, the annular groove 23 is arranged at the front end of the outer surface of one side of the fixed seat 22, the limit groove 24 is uniformly arranged at the rear end of the outer surface of one side of the fixed seat 22, the heating pipe 25 is movably arranged in the annular groove 23, the air inlet pipe 26 is fixedly arranged at the middle position of the rear end of the heating pipe 25, the combustion nozzle 251 is uniformly arranged in the radial direction of the heating pipe 25, a fixed frame 261 is fixedly arranged at the front end of the outer surface of the upper end of the air inlet pipe 26, a limit rod 262 penetrates through the fixed frame 261, a limit disc 2621 is fixedly arranged at one side, which is close to the outer surface of the fixed seat 22, a spring 2622 is fixedly arranged between the limiting disc 2621 and the fixing frame 261.

By adopting the technical scheme, firstly, the heating mechanism 2 is adjusted to the position corresponding to the welding position of the cylinder bottom of the oil cylinder by adjusting the adjustable lifting caster wheel 13 on the heating box body 1, then the limiting rod 262 is pulled to enable the limiting disc 2621 to extrude the spring 2622 along with the movement of the limiting rod 262, so that the limiting rod 262 is separated from the limiting groove 24, then the limiting rod 262 is pushed to move, the limiting rod 262 drives the air inlet pipe 26 to move, the air inlet pipe 26 drives the heating pipe 25 to slide in the annular groove 23, thereby adjusting the position of the combustion nozzle 251, when the combustion nozzle 251 is adjusted to a required position, the limiting rod 262 is slowly loosened, the limiting rod 262 is clamped in the limiting groove 24 under the action of the elastic force of the spring 2622, thereby enabling the heating pipe 25 to preheat the welding position of the cylinder bottom of the oil cylinder, the adjustment is convenient, the angle adjustment of the heating pipe 25 can carry out omnibearing preheating on the welding position of the cylinder bottom of the oil cylinder, and make the effect of preheating more even abundant, then open gas jar 11 again and make the gas enter into heating pipe 25 through gas pipe 35 in, rethread control pulse igniter 253 lights from burning nozzle 251 spun gas to preheat the welding department, monitor the preheating temperature of welding department through temperature sensor 254, thereby can in time preheat the temperature and make the regulation.

Specifically, the corner positions of the outer surface of the lower end of the heating box body 1 are fixedly provided with adjustable lifting caster wheels 13.

Through adopting above-mentioned technical scheme, adjustable lifting caster 13 can adjust the height of heating box 1 to adjust the position of heating pipe 25, and make things convenient for the removal of heating box 1.

Specifically, the upper end and the lower end of the outer surface of one side of the fixed seat 22 are both provided with a baffle 252, and the front end of the heating pipe 25 is provided with a pulse igniter 253 and a temperature sensor 254.

Through adopting above-mentioned technical scheme, the baffle 252 that both ends all set up about one side surface of fixing base 22 makes heating pipe 25 slide in ring channel 23, prevents that heating pipe 25 roll-off ring channel 23, has protected heating pipe 25 and gas pipe 35, and pulse igniter 253 is used for lighting the gas, and temperature sensor 254 is used for monitoring preheating temperature.

Specifically, receiving mechanism 3 includes fixed axle 31, sleeve pipe 32, fixed disk 33, elastic webbing 34 and gas pipe 35, fixed axle 31 fixed mounting is in heating box 1, sleeve pipe 32 cup joints on fixed axle 31, fixed disk 33 cup joints in sleeve pipe 32 surface both sides, elastic webbing 34 fixed mounting is between the inside rear end of heating box 1 and the upper end surface of sleeve pipe 32, gas pipe 35 twines on sleeve pipe 32 and is located between two fixed disks 33.

Through adopting above-mentioned technical scheme, when removing heating pipe 25, gas pipe 35 can follow the removal of intake pipe 26 and remove, thereby make the gas pipe 35 of winding on sleeve pipe 32 take out from guiding mechanism 12, the removal of gas pipe 35 drives sleeve pipe 32's rotation, thereby make elastic webbing 34 winding on sleeve pipe 32, under the effect of elastic webbing 34 elasticity, make gas pipe 35 can twine on sleeve pipe 32 all the time, both protected gas pipe 35 not destroyed by external environment, the winding of gas pipe 35 self has also been prevented, it is orderly to have stretched out and drawn back.

Specifically, the sleeve 32 can rotate on the fixed shaft 31, and the position of the fixed disk 33 can be adjusted according to the winding number of the gas pipe 35.

Through adopting above-mentioned technical scheme, sleeve pipe 32 can rotate on fixed axle 31, is convenient for realize accomodating of gas pipe 35, and the position of fixed disk 33 can be adjusted according to the winding number of turns of gas pipe 35, prevents gas pipe 35 slippage sleeve pipe 32, and sleeve pipe 32's cast structure makes gas pipe 35 twine above also can not damage.

Specifically, the intake pipe 26 is trumpet-shaped, the rear end pipe diameter of the intake pipe 26 is larger than the front end pipe diameter, and the rear end of the intake pipe 26 is provided with a rubber layer.

Through adopting above-mentioned technical scheme, the shape loudspeaker form of intake pipe 26, the friction loss of gas pipe 35 when intake pipe 26 contact has been reduced to the horn structure.

Concretely, heating box 1 right side wall fixed mounting has with gas pipe 35 assorted guiding mechanism 12, guiding mechanism 12 includes outer axle sleeve 121, interior axle sleeve 122, sealing washer 123 and oil storage bottle 124, fixed connection between outer axle sleeve 121 and the heating box 1 lateral wall, outer axle sleeve 121 internally rotates installs interior axle sleeve 122, the equal fixed mounting of outer axle sleeve 121 both sides opening part and interior axle sleeve 122 contact position department has sealing washer 123, outer axle sleeve 121 top fixed mounting has oil storage bottle 124, be provided with lubricating oil 126 between outer axle sleeve 121 and the interior axle sleeve 122, passageway 125 has been seted up at interior axle sleeve 122 middle part, gas pipe 35 runs through the setting inside passageway 125.

By adopting the above technical scheme, when the position of the combustion nozzle 251 is adjusted, the gas pipe 35 can be pulled to move along the channel 125, in the process, because the heating pipe 25 can deflect at an angle, the gas pipe 35 can drive the inner shaft sleeve 122 to rotate inside the outer shaft sleeve 121, so that the inner shaft sleeve 122 and the outer shaft sleeve 121 deflect at an angle, thereby effectively preventing the mutual friction between the gas pipe 35 and the channel 125 due to the angle problem, further preventing the abrasion loss of the surface of the gas pipe 35, effectively protecting the surface of the gas pipe 35 from scratches, meanwhile, because the top of the outer shaft sleeve 121 is provided with the oil storage bottle 124, the inside of the oil storage bottle 124 is provided with the lubricating oil 126, when the inner shaft sleeve 122 and the outer shaft sleeve 121 rotate, the lubricating oil 126 inside the oil storage bottle 124 can flow to a gap formed between the inner shaft sleeve 122 and the outer shaft sleeve 121, like this when taking place the looks mutual rotation between the two when interior axle sleeve 122 and outer axle sleeve 121, can reduce friction between the two, and then be convenient for take place the angular rotation between the two, the oilhole has been seted up to oil storage bottle 124 bottom, the vestibule corresponding with the oilhole has been seted up on outer axle sleeve 121 surface, lubricating oil 126 can flow in the gap that forms between outer axle sleeve 121 and the interior axle sleeve 122 along the vestibule, outer axle sleeve 121 both sides opening part and interior axle sleeve 122 contact position department all fixed mounting have sealing washer 123, sealing washer 123 can prevent effectively that lubricating oil 126 from flowing out, play very good sealed effect.

The working principle is as follows: firstly, the heating mechanism 2 is adjusted to a position corresponding to the welding position of the cylinder bottom of the oil cylinder by adjusting the adjustable lifting caster wheel 13 on the heating box body 1, then the limiting rod 262 is pulled, the limiting disc 2621 extrudes the spring 2622 along with the movement of the limiting rod 262, the limiting rod 262 is separated from the limiting groove 24, then the limiting rod 262 is pushed to move, the limiting rod 262 drives the air inlet pipe 26 to move, the air inlet pipe 26 drives the heating pipe 25 to slide in the annular groove 23, so as to adjust the position of the combustion nozzle 251, when the combustion nozzle 251 is adjusted to a required position, the limiting rod 262 is slowly loosened, the limiting rod 262 is clamped in the limiting groove 24 under the action of the elastic force of the spring 2622, so that the heating pipe 25 preheats the welding position of the cylinder bottom of the oil cylinder, the adjustment is convenient, and the preheating effect is more uniform and sufficient; when the heating pipe 25 is moved, the gas pipe 35 moves along with the movement of the air inlet pipe 26, so that the gas pipe 35 wound on the sleeve pipe 32 is drawn out of the guide mechanism 12, the movement of the gas pipe 35 drives the sleeve pipe 32 to rotate, the elastic belt 34 is wound on the sleeve pipe 32, and the gas pipe 35 can be wound on the sleeve pipe 32 all the time under the action of the elastic force of the elastic belt 34, so that the gas pipe 35 is protected from being damaged by the external environment, the self winding of the gas pipe 35 is also prevented, and the telescopic effect is orderly realized; then, the gas tank 11 is opened again to enable the gas to enter the heating pipe 25 through the gas pipe 35, and the gas sprayed out from the combustion nozzle 251 is ignited through the control pulse igniter 253, so that the welding position is preheated, the preheating temperature of the welding position is monitored through the temperature sensor 254, and therefore the preheating temperature can be adjusted timely.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.