Metal pipe heating and spraying device

Abstract

The invention belongs to the technical field of spraying devices, and discloses a metal pipe heating spraying device which comprises a bottom plate, driving control mechanisms are fixedly connected to the left side and the right side of the upper surface of the bottom plate, two driving shafts are arranged in the middles of the driving control mechanisms, and transmission rollers are fixedly connected to the middles of the driving shafts. And the driving shaft is in transmission connection with the driving control mechanism. According to the device, an air pump works, air is pumped into an air cavity through a control pipe I, so that a rectangular plate moves towards the inner side and extrudes a connecting spring, when the rectangular plate moves to the innermost position, the air pump stops working, a distribution valve is in a completely closed state, and then a telescopic rod works, so that a plurality of rotating balls are tightly attached to the curved surface of a metal pipe; and therefore, the problem that the limiting effect is poor due to the fact that an existing limiting device cannot be completely attached to the surfaces of the metal pipes when limiting the metal pipes with different pipe diameters is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of spraying devices, and in particular relates to a metal pipe heating spraying device. Background Art

[0002] Metal pipes are tools for conveying liquids or gases and are widely used in various fields of the national economy. However, the inner and outer walls of the pipes are inevitably in contact with various media, which leads to oxidation corrosion, greatly shortening the service life of the material. The metal pipe heating spraying device is mainly used for spraying on the surface of metal pipes, thereby increasing the service life of metal pipes, especially when high-temperature spraying materials (such as thermal spray coatings) are required.

[0003] During the existing metal heating spraying, the metal tube is rotated and transported linearly into the interior of the heating spraying mechanism. During the transportation, the metal tube will deviate and vibrate, and the metal needs to be limited. Since the outer surface of the metal tube is a curved surface, the existing limiting device cannot completely fit the surface of the metal tube when limiting the metal tubes of different diameters, resulting in poor limiting effect. Secondly, during the transmission process, the surface of the metal tube with obvious rust, oxide layer and old paint layer will be treated with a steel brush to improve the adhesion effect of the spraying material on the surface of the metal tube. However, after the existing steel brush treats the surface of the metal tube for a long time, the bristles will bend, which makes the treatment effect worse, but the bristles are long, which causes waste. Summary of the invention

[0004] The object of the present invention is to provide a metal pipe heating spraying device to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a metal pipe heating spraying device, comprising a base plate, the left and right sides of the upper surface of the base plate are fixedly connected to a driving control mechanism, two driving shafts are arranged in the middle of the driving control mechanism, a driving roller is fixedly connected to the middle of the driving shaft, the driving shaft and the driving control mechanism are transmission-connected, two supporting frames are fixedly connected to the middle of the base plate, a transmission shaft is fixedly connected to the middle of the supporting frame, the front and rear parts of the transmission shaft are fixedly connected to a driving synchronous wheel, the rear end of the transmission shaft is fixedly connected to a driver, a telescopic rod is rotatably installed on the top of the transmission shaft, an adjusting driving wheel is fixedly connected to the middle of the telescopic rod, a synchronous belt is connected to the curved surface transmission of the adjusting driving wheel and the driving synchronous wheel, the telescopic end of the telescopic rod is fixedly connected to a cylinder sleeve, a processing mechanism is arranged inside the cylinder sleeve, a limiting mechanism is arranged on the inner side of the cylinder sleeve, an adjusting mechanism is fixedly installed on the upper surface of the cylinder sleeve, and a movable plate is movably installed on the lower surface of the cylinder sleeve.

[0006] Preferably, the processing mechanism includes a sliding plate, a wire brush body is clamped in the middle of the inner side of the sliding plate, a plurality of wire bristles are fixedly installed in the middle of the wire brush body, inner connecting plates are fixedly connected on both the left and right sides of the inner side of the sliding plate, a plurality of sliding connecting plates are slidably connected to the side of the inner connecting plate away from the wire bristles, an outer connecting plate is slidably connected to the outer side of the outermost sliding connecting plate, a sealing sleeve is fixedly connected to the inner side of the outer connecting plate, the sealing sleeve is fixedly connected to the inner side of the cylinder sleeve, and the sliding plate is slidably connected to the inside of the cylinder sleeve.

[0007] Preferably, the limiting mechanism includes an air cavity, a plurality of rectangular plates are slidably connected to the interior of the air cavity, a connecting rod is fixedly connected to the inner side of the rectangular plate, a ball sleeve is fixedly connected to the inner end of the connecting rod, a rotating ball is movably installed on the inner side of the ball sleeve, a connecting spring is fixedly connected between the rectangular plate and the inner wall of the air cavity, the inner side of the air cavity is connected to the airway, and a control valve three is fixedly installed in the middle of the airway.

[0008] Preferably, the regulating mechanism includes an air pump, an air outlet pipe is fixedly connected to the top of the air pump, a distribution valve is fixedly installed on the top of the air outlet pipe, the inner side of the distribution valve is connected to control pipe 1, the outer side of the distribution valve is connected to control pipe 2, the middle part of the air outlet pipe is connected to a cleaning pipe, the inner end of the cleaning pipe is fixedly connected to a rectangular shell, the middle outer side of the cleaning pipe is fixedly connected to exhaust pipe 2, the middle part of exhaust pipe 2 is fixedly installed with control valve 2, the middle part of the cleaning pipe is connected to exhaust pipe 1, and the middle part of exhaust pipe 1 is fixedly connected to control valve 1.

[0009] Preferably, the driver is fixedly connected to the base plate, a plurality of through holes adapted to the wire brush bristles are provided on the inner side surface of the cylinder sleeve, and the sealing performance among the inner connecting plate, the sliding connecting plate and the outer connecting plate is good.

[0010] Preferably, the air cavity and the air passage are both opened inside the cylinder liner, the connecting rod is slidably connected to the cylinder liner, the end of the control pipe away from the distribution valve is connected to the air cavity, and the end of the exhaust pipe away from the cleaning pipe is connected to the air cavity.

[0011] Preferably, one end of the second control pipe away from the distribution valve is communicated with the inside and outside of the cylinder liner, and one end of the second exhaust pipe away from the cleaning pipe is communicated with the inside and outside of the cylinder liner.

[0012] The beneficial effects of the present invention are as follows:

[0013] 1. The present invention works by an air pump to pump gas into the interior of the air cavity through a control tube, thereby causing the rectangular plate to move inward and squeeze the connecting spring. When the rectangular plate moves to the innermost position, the air pump stops working, and the distribution valve is in a fully closed state. Subsequently, the telescopic rod works, thereby causing a plurality of rotating balls to fit tightly with the curved surface of the metal tube, thereby limiting the metal tube, thereby solving the problem that when existing limiting devices are used to limit metal tubes of different diameters, they cannot fit completely with the surface of the metal tube, resulting in a poor limiting effect.

[0014] 2. The present invention works by means of an air pump to pump gas into the interior of the air cavity through control tube 1, and control valve 3 and control valve 1 are opened to move the sliding plate and the wire bristles outward, thereby straightening the bent wire bristles, and the driver drives the transmission shaft to rotate, and the transmission shaft drives the synchronous wheel and the telescopic rod to rotate 180 degrees through the synchronous belt, so that the wire bristles can better treat the surface of the metal pipe, thereby solving the problem that the bristles will bend after the existing steel brush treats the surface of the metal pipe for a long time, making the treatment effect worse.

[0015] 3. The present invention works through an air pump, and the gas enters the inner and outer sides of the cylinder sleeve, thereby pushing the sliding plate to move inward. When the inner end of the wire brush bristles contacts the metal tube, it stops moving. When the metal tube rotates, the wire brush bristles will process it. As the wire brush bristles wear, the inner and outer sides of the cylinder sleeve will become more, so that the wire brush bristles can be used for a long time, so that the part of the wire brush bristles close to the wire brush body can be fully used, thereby avoiding waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structural appearance of the present invention;

[0017] Figure 2 This is a schematic diagram of the support structure of the present invention;

[0018] Figure 3 For the present invention Figure 2 The enlarged schematic diagram at A in the middle;

[0019] Figure 4 A half-section schematic diagram of a cylinder sleeve of the present invention;

[0020] Figure 5 A half-section schematic diagram of a sliding plate of the present invention;

[0021] Figure 6 This is a schematic diagram of the structure of an exhaust pipe of the present invention;

[0022] Figure 7 It is a half-section schematic diagram of the air cavity of the present invention.

[0023] In the figure: 1, bottom plate; 2, drive control mechanism; 3, drive shaft; 5, synchronous belt; 6, transmission roller; 7, movable plate; 8, support frame; 9, transmission shaft; 10, driving synchronous wheel; 11, driver; 12, telescopic rod; 13, adjusting driving wheel; 14, cylinder sleeve; 15, processing mechanism; 151, sliding plate; 152, wire brush body; 153, wire brush bristles; 154, inner connecting plate; 155, sliding connecting plate; 156, outer connecting plate; 157, sealing sleeve; 16, limiter Structure; 161, air cavity; 162, rectangular plate; 163, connecting rod; 164, ball sleeve; 165, rotating ball; 166, connecting spring; 167, airway; 168, control valve three; 17, regulating mechanism; 171, air pump; 172, air outlet pipe; 173, distribution valve; 174, control pipe one; 175, control pipe two; 176, cleaning pipe; 177, rectangular shell; 178, exhaust pipe two; 179, control valve two; 1710, exhaust pipe one; 1711, control valve one. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] like Figures 1 to 7 As shown, an embodiment of the present invention provides a metal pipe heating spraying device, including a bottom plate 1, the left and right sides of the upper surface of the bottom plate 1 are fixedly connected to the driving control mechanism 2, two driving shafts 3 are arranged in the middle of the driving control mechanism 2, the middle of the driving shaft 3 is fixedly connected to a transmission roller 6, the driving shaft 3 and the driving control mechanism 2 are transmission-connected, the middle of the bottom plate 1 is fixedly connected to two support frames 8, the middle of the support frame 8 is fixedly connected to a transmission shaft 9, the front and rear parts of the transmission shaft 9 are fixedly connected to a driving synchronous wheel 10, the transmission shaft 9 The rear end of the telescopic rod 12 is fixedly connected to a driver 11, a telescopic rod 12 is rotatably installed on the top of the transmission shaft 9, an adjusting driving wheel 13 is fixedly connected to the middle of the telescopic rod 12, and a synchronous belt 5 is connected to the curved transmission of the adjusting driving wheel 13 and the driving synchronous wheel 10, the telescopic end of the telescopic rod 12 is fixedly connected to a cylinder sleeve 14, a processing mechanism 15 is arranged inside the cylinder sleeve 14, a limiting mechanism 16 is arranged on the inner side of the cylinder sleeve 14, an adjusting mechanism 17 is fixedly installed on the upper surface of the cylinder sleeve 14, and a movable plate 7 is movably installed on the lower surface of the cylinder sleeve 14.

[0026] The processing mechanism 15 includes a sliding plate 151, a wire brush body 152 is clamped in the middle of the inner side of the sliding plate 151, a plurality of wire bristles 153 are fixedly installed in the middle of the wire brush body 152, an inner connecting plate 154 is fixedly connected to the left and right sides of the inner side of the sliding plate 151, a plurality of sliding connecting plates 155 are slidably connected to the side of the inner connecting plate 154 away from the wire bristles 153, an outer connecting plate 156 is slidably connected to the outer side of the outermost sliding connecting plate 155, a sealing sleeve 157 is fixedly connected to the inner side of the outer connecting plate 156, and the sealing sleeve 157 is fixedly connected to the inner side of the cylinder sleeve 14, and the sliding plate 151 is fixedly connected to the inner side of the cylinder sleeve 14 The function of the sliding connection is to pump the gas into the interior of the air cavity 161 through the control tube 174 through the air pump 171, and the control valve 3 168 and the control valve 1 1711 are opened to make the sliding plate 151 and the wire bristles 153 move outward, thereby straightening the bent wire bristles 153, and the driver 11 drives the transmission shaft 9 to rotate, and the transmission shaft 9 drives the driving synchronous wheel 10 and the telescopic rod 12 to rotate one hundred and eighty degrees, so that the wire bristles 153 can better treat the surface of the metal pipe, thereby solving the problem that the bristles will bend after the existing steel brush treats the surface of the metal pipe for a long time, making the treatment effect worse.

[0027] The limiting mechanism 16 includes an air cavity 161, a plurality of rectangular plates 162 are slidably connected inside the air cavity 161, a connecting rod 163 is fixedly connected to the inner side of the rectangular plate 162, a ball sleeve 164 is fixedly connected to the inner end of the connecting rod 163, a rotating ball 165 is movably installed inside the ball sleeve 164, a connecting spring 166 is fixedly connected between the rectangular plate 162 and the inner wall of the air cavity 161, the inner side of the air cavity 161 is connected to the airway 167, and a control valve 168 is fixedly installed in the middle of the airway 167, which is used to work through the air pump 171 to move the air into the airway 167. The liquid is pumped into the air cavity 161 through the control tube 174, so that the rectangular plate 162 moves inward and squeezes the connecting spring 166. When the rectangular plate 162 moves to the innermost position, the air pump 171 stops working, and the distribution valve 173 is in a fully closed state. Then the telescopic rod 12 works, so that the multiple rotating balls 165 fit tightly with the curved surface of the metal pipe, thereby limiting the metal pipe, thereby solving the problem that the existing limiting device cannot completely fit with the surface of the metal pipe when limiting the metal pipes of different diameters, resulting in poor limiting effect.

[0028] The regulating mechanism 17 includes an air pump 171, an air outlet pipe 172 is fixedly connected to the top of the air pump 171, a distribution valve 173 is fixedly installed on the top of the air outlet pipe 172, the inner side of the distribution valve 173 is connected to a control pipe 174, the outer side of the distribution valve 173 is connected to a control pipe 2 175, the middle of the air outlet pipe 172 is connected to a cleaning pipe 176, the inner end of the cleaning pipe 176 is fixedly connected to a rectangular shell 177, the middle outer side of the cleaning pipe 176 is fixedly connected to an exhaust pipe 2 178, the middle of the exhaust pipe 2 178 is fixedly installed with a control valve 2 179, and the middle inner side of the cleaning pipe 176 is connected to an exhaust pipe 1710, a control valve 1711 is fixedly connected to the middle of the exhaust pipe 1710, and its function is that through the operation of the air pump 171, the gas enters the inner and outer sides of the cylinder sleeve 14, thereby pushing the sliding plate 151 to move inward, and the inner end of the wire bristles 153 stops moving when it contacts the metal pipe. When the metal pipe rotates, the wire bristles 153 will process it. As the wire bristles 153 wear, the inner and outer sides of the cylinder sleeve 14 will become more, so that the wire bristles 153 can be used for a long time, so that the part of the wire bristles 153 close to the wire brush body 152 can be fully used, thereby avoiding waste.

[0029] The driver 11 is fixedly connected to the bottom plate 1, a plurality of through holes adapted to the wire brush 153 are provided on the inner side of the cylinder sleeve 14, the inner connecting plate 154, the sliding connecting plate 155 and the outer connecting plate 156 have good sealing properties, the air cavity 161 and the air passage 167 are both provided inside the cylinder sleeve 14, the connecting rod 163 is slidably connected to the cylinder sleeve 14, the end of the control pipe 174 away from the distribution valve 173 is connected to the air cavity 161, the end of the exhaust pipe 1710 away from the cleaning pipe 176 is connected to the air cavity 161, the end of the control pipe 2 175 away from the distribution valve 173 is connected to the inner and outer sides of the cylinder sleeve 14, and the end of the exhaust pipe 2 178 away from the cleaning pipe 176 is connected to the inner and outer sides of the cylinder sleeve 14. , the distribution valve 173 is in a state where the control tube 174 is connected to the air outlet pipe 172, and the control tube 175 and the cleaning tube 176 are not connected to the air outlet pipe 172. The air pump 171 works to pump the gas into the interior of the air cavity 161 through the control tube 174, thereby moving the rectangular plate 162 inward. When the control valve 3 168 is opened, the gas enters the space formed by the cylinder sleeve 14 and the inner connecting plate 154 through the air channel 167, thereby realizing the resetting of the sliding plate 151. The control valve 2 179 is opened, and the internal gas of the air cavity 161 is discharged through the exhaust pipe 2 178, thereby realizing the resetting. When the sliding plate 151 is located at the outermost side, the movable plate 7 can be opened to replace the wire brush body 152 and the wire brush bristles 153.

[0030] Working principle:

[0031] Before the present invention is used, the distance between the transmission rollers 6 is adjusted by the driving control mechanism 2 to make it fit the metal pipe to be heated and sprayed, the driver 11 drives the transmission shaft 9 to rotate, and the transmission shaft 9 drives the driving synchronous wheel 10 and the telescopic rod 12 to rotate ninety degrees through the synchronous belt 5;

[0032] When the present invention is used, the metal tube is passed between the two driving rollers 6, and one end is located between the two cylinder sleeves 14. The distribution valve 173 is in a state where the control tube 174 is connected to the outlet pipe 172, and the control tube 175 and the cleaning tube 176 are not connected to the outlet pipe 172. The air pump 171 works to pump gas into the air cavity 161 through the control tube 174, so that the rectangular plate 162 moves inward and squeezes the connecting spring 166. When the rectangular plate 162 moves to the innermost position, the air pump 171 stops working, the distribution valve 173 is in a fully closed state, and then the telescopic rod 12 works, so that The plurality of rotating balls 165 are closely fitted with the curved surface of the metal tube, thereby limiting the position of the metal tube. Subsequently, the distribution valve 173 is in a state where the control tube 2 175 is connected to the air outlet pipe 172, and the control tube 174 and the cleaning tube 176 are not connected to the air outlet pipe 172. The air pump 171 works, and the gas enters the inner and outer sides of the cylinder sleeve 14, thereby pushing the sliding plate 151 to move inward. When the inner end of the wire brush 153 contacts the metal tube, the movement stops. The distribution valve 173 is in a state where the cleaning tube 176 is connected to the air outlet pipe 172, and the control tube 174 and the control tube 2 175 are not connected to the air outlet pipe 172.

[0033] The driving control mechanism 2 drives the driving shaft 3 to rotate, and the driving shaft 3 drives the transmission roller 6 to rotate. The rotation directions of the two transmission rollers 6 are opposite, so that the metal tube between them rotates and moves linearly at the same time. The wire bristles 153 will process the surface of the metal tube, and the gas ejected from the rectangular shell 177 will blow away the residue. Since the distance that the wire bristles 153 leak out of the cylinder sleeve 14 is short, it will be more difficult for the surface of the metal tube to be bent, which ensures the cleaning effect while increasing the service life of the wire bristles 153.

[0034] When the wire bristles 153 are bent, the distribution valve 173 is in a state where the control tube 174 is connected to the air outlet pipe 172, and the control tube 2 175 and the cleaning tube 176 are not connected to the air outlet pipe 172. The air pump 171 works to pump the gas into the interior of the air cavity 161 through the control tube 174. The control valve 3 168 and the control valve 1 1711 are opened to move the sliding plate 151 and the wire bristles 153 outward, thereby straightening the bent wire bristles 153. The driver 11 drives the transmission shaft 9 to rotate, and the transmission shaft 9 drives the driving synchronous wheel 10 and the telescopic rod 12 to rotate one hundred and eighty degrees through the synchronous belt 5, so that the wire bristles 153 can better process the surface of the metal pipe.

[0035] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A metal tube heating spraying device, comprising a bottom plate (1), the left and right sides of the upper surface of the bottom plate (1) are fixedly connected to a drive control mechanism (2), two drive shafts (3) are arranged in the middle of the drive control mechanism (2), a drive roller (6) is fixedly connected in the middle of the drive shaft (3), and the drive shaft (3) is connected to the drive control mechanism (2) in a transmission manner, characterized in that: Two support frames (8) are fixedly connected to the middle of the base plate (1), a transmission shaft (9) is fixedly connected to the middle of the support frame (8), the front and rear parts of the transmission shaft (9) are fixedly connected to a driving synchronous wheel (10), the rear end of the transmission shaft (9) is fixedly connected to a driver (11), a telescopic rod (12) is rotatably mounted on the top of the transmission shaft (9), an adjusting driving wheel (13) is fixedly connected to the middle of the telescopic rod (12), a synchronous belt (5) is connected to the curved surface transmission of the adjusting driving wheel (13) and the driving synchronous wheel (10), the telescopic end of the telescopic rod (12) is fixedly connected to a cylinder sleeve (14), a processing mechanism (15) is arranged inside the cylinder sleeve (14), a limiting mechanism (16) is arranged on the inner side of the cylinder sleeve (14), an adjusting mechanism (17) is fixedly mounted on the upper surface of the cylinder sleeve (14), and a movable plate (7) is movably mounted on the lower surface of the cylinder sleeve (14).

2. A metal tube heating spraying device according to claim 1, characterized in that: The processing mechanism (15) comprises a sliding plate (151), a wire brush body (152) is clamped in the middle of the inner side of the sliding plate (151), a plurality of wire bristles (153) are fixedly installed in the middle of the wire brush body (152), the inner left and right sides of the sliding plate (151) are fixedly connected with inner connecting plates (154), the side of the inner connecting plate (154) away from the wire bristles (153) is slidably connected with a plurality of sliding connecting plates (155), the outer side of the outermost sliding connecting plate (155) is slidably connected with an outer connecting plate (156), the inner side of the outer connecting plate (156) is fixedly connected with a sealing sleeve (157), the sealing sleeve (157) is fixedly connected to the inner side of the cylinder sleeve (14), and the sliding plate (151) is slidably connected to the inside of the cylinder sleeve (14).

3. A metal tube heating spraying device according to claim 2, characterized in that: The limiting mechanism (16) comprises an air cavity (161), a plurality of rectangular plates (162) are slidably connected inside the air cavity (161), a connecting rod (163) is fixedly connected to the inner side of the rectangular plate (162), a ball sleeve (164) is fixedly connected to the inner end of the connecting rod (163), a rotating ball (165) is movably installed on the inner side of the ball sleeve (164), a connecting spring (166) is fixedly connected between the rectangular plate (162) and the inner wall of the air cavity (161), the inner side of the air cavity (161) is connected to the air passage (167), and a control valve three (168) is fixedly installed in the middle of the air passage (167).

4. A metal tube heating spraying device according to claim 1, characterized in that: The regulating mechanism (17) comprises an air pump (171), an air outlet pipe (172) is fixedly connected to the top of the air pump (171), a distribution valve (173) is fixedly installed on the top of the air outlet pipe (172), the inner side of the distribution valve (173) is connected to a control pipe 1 (174), the outer side of the distribution valve (173) is connected to a control pipe 2 (175), the middle part of the air outlet pipe (172) is connected to a cleaning pipe (176), the inner end of the cleaning pipe (176) is fixedly connected to a rectangular shell (177), the middle outer side of the cleaning pipe (176) is fixedly connected to an exhaust pipe 2 (178), the middle part of the exhaust pipe 2 (178) is fixedly installed with a control valve 2 (179), the middle inner side of the cleaning pipe (176) is connected to an exhaust pipe 1 (1710), and the middle part of the exhaust pipe 1 (1710) is fixedly connected to a control valve 1 (1711).

5. A metal pipe heating spraying device according to claim 4, characterized in that: The driver (11) is fixedly connected to the base plate (1); a plurality of through holes adapted to the steel wire bristles (153) are provided on the inner side surface of the cylinder sleeve (14); and the sealing performance between the inner connecting plate (154), the sliding connecting plate (155) and the outer connecting plate (156) is good.

6. A metal pipe heating spraying device according to claim 5, characterized in that: The air cavity (161) and the air passage (167) are both opened inside the cylinder sleeve (14); the connecting rod (163) is slidably connected to the cylinder sleeve (14); the end of the control pipe (174) away from the distribution valve (173) is connected to the air cavity (161); and the end of the exhaust pipe (1710) away from the cleaning pipe (176) is connected to the air cavity (161).

7. A metal pipe heating spraying device according to claim 6, characterized in that: One end of the second control pipe (175) away from the distribution valve (173) is in communication with the inside and outside of the cylinder liner (14), and one end of the second exhaust pipe (178) away from the cleaning pipe (176) is in communication with the inside and outside of the cylinder liner (14).

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