A coiled tube vaporization system for liquefied gas liquids

Abstract

The application discloses a liquefied gas liquid serpentine pipe vaporization system, which comprises a vaporization pipeline, the vaporization pipeline comprises a straight pipe and a bend pipe which are sequentially communicated, a jacket group for providing heat exchange is arranged on the straight pipe, the jacket group comprises an inner jacket which is sleeved on the outer portion of the straight pipe, a jacket cover which provides sealing action for the inner jacket, and the inner jacket is connected with a first jacket connecting pipe to convey the heating medium in the inner jacket. The application overcomes the shortcomings of the prior art, has reasonable design, optimizes the treatment mode of the freezing condition of the jacket for heat exchange due to the flow cut-off and insufficient flow, avoids the uneven heating and the overpressure in the pipe, regularly scrapes the attachments on the wall of the heat exchange pipe, avoids the attachment accumulation to reduce the heat exchange efficiency of the pipe wall, and has high social use value and application prospect.

Description

Technical Field

[0001] This invention relates to the field of serpentine vaporizer technology, and more particularly to a serpentine vaporization system for liquefied gas. Background Technology

[0002] The serpentine vaporizer is a common heat exchanger in factory production processes. When liquefied petroleum gas (LPG) needs to be converted from liquid to gas, the LPG needs to flow into the vaporizer. By introducing hot water into the jacket, heat exchange is used to convert the LPG from a liquid state to a gaseous state. Because the boiling point of LPG is low, the temperature of the heating medium needs to be controlled between 20°C and 40°C during the liquid-to-gas conversion process to avoid overpressure inside the flowing LPG due to excessive temperature.

[0003] In existing vaporization processes, the heating medium inside the jacket is not hot enough. If the heating medium is interrupted or the flow is insufficient, the heating medium will freeze inside the jacket, causing blockage. The most common solution is to heat the jacket with hot water from the outside, which results in uneven heating and the presence of a certain amount of liquefied gas inside the inner tube, which can easily cause overpressure and other safety hazards.

[0004] Furthermore, with the continuous flow of heating medium inside the jacket, long-term flow will inevitably lead to the formation of deposits, which will affect the efficiency of heat exchange and require regular cleaning. Most existing jackets are directly welded to the outer wall of the inner tube, and cleaning water can only be introduced into the jacket through the pipe through which the heating medium flows to flush out the deposits. This cleaning method is inefficient and consumes a large amount of cleaning water resources.

[0005] To address this issue, the inventors have designed and developed a vaporization system that can optimize the handling of jacket flow interruption or insufficient flow. This system can eliminate jacket icing while preventing overpressure in the inner tube. Summary of the Invention

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A serpentine pipe vaporization system for liquefied gas includes a vaporization pipe, which includes a straight pipe and a bend connected in sequence. The straight pipe is provided with a jacket assembly to provide heat exchange. The jacket assembly includes an inner jacket sleeved outside the straight pipe and a jacket cover to provide a sealing function for the inner jacket. The inner jacket is connected to a first jacket connecting pipe to transport the heating medium inside it.

[0008] The inner jacket is fitted with an outer jacket to provide heating, and the outer jacket is connected to a second jacket connecting pipe to provide a flow channel for the internal heating medium.

[0009] A vent pipe is connected to the outer sleeve at the bottom of the vaporization pipe, and a drain pipe is connected to the outer sleeve at the top of the vaporization pipe.

[0010] Preferably, the straight pipe end is provided with a gasket ring that matches the jacket cap to provide a sealing treatment for the inner jacket, and the surface of the straight pipe is provided with a threaded groove.

[0011] Preferably, the straight pipe is provided with a sleeve block mechanism that matches the threaded groove assembly. The sleeve block mechanism includes an inner threaded collar sleeved on the outside of the threaded groove, and a movable collar is movably sleeved on the inner threaded collar. Both ends of the movable collar are provided with mounting mechanisms.

[0012] Preferably, the installation mechanism includes a mounting base fixedly connected to a movable collar, the mounting base having a first scraping mechanism for scraping off the surface of the straight pipe, the mounting base also having an embedded groove for installing the first scraping mechanism, and an accessory compartment.

[0013] Preferably, the accessory compartment is provided with a locking mechanism for fixing the first scraping mechanism. The locking mechanism includes a locking rod for inserting into the first scraping mechanism. The other end of the locking rod is provided with a baffle located in the accessory compartment, and a push plate for pushing the baffle to move in the accessory compartment. The push plate is provided with a sealing arc plate to prevent the heating medium from entering the accessory compartment. A spring is connected to the other side of the baffle and fixed to the inner wall of the baffle.

[0014] Preferably, the first scraping mechanism includes a first scraping base embedded in an inner groove, the first scraping base is provided with a first scraping plate for scraping off the attachments on the surface of the straight pipe, and the first scraping base is also provided with a locking hole for inserting a locking rod.

[0015] Preferably, the movable collar is provided with a collar assembly, the collar assembly includes a main collar that is movably fitted with the movable collar, the outer sleeve is provided with a drive motor for driving the main collar to move laterally, the output shaft of the drive motor is provided with a rotating shaft, and the collar assembly also includes a slider for matching the rotating shaft.

[0016] Preferably, the main ring sleeve is provided with a second scraping mechanism for scraping off the deposits on the inner wall of the jacket assembly. The second scraping mechanism includes a second scraping base fixed to the surface of the main ring sleeve, and a second scraping plate that contacts the inner wall of the jacket assembly is provided on the second scraping base.

[0017] Preferably, the bottom surface of the accessory compartment is provided with a guide strip to provide guidance and balance for the baffle, and the mounting base is provided with a sealing cover to provide a sealing function for the accessory compartment. The sealing cover, together with the guide strip, provides guidance and balance for the baffle.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. By setting up an outer jacket and using the second jacket connecting pipe to connect the pipes between the outer jackets, as well as the drain pipe and vent pipe to connect the inside of the outer jacket, if the heating medium inside the jacket assembly freezes, the heating medium flowing inside the outer jacket can melt the ice inside the jacket assembly without the need for heating with hot water outside the jacket assembly, thus reducing the probability of overpressure hazards.

[0020] 2. By setting up the sleeve block mechanism and the ring sleeve group, and by utilizing the cooperation between the drive motor, the rotating shaft, the sleeve block mechanism and the ring sleeve group, the inner threaded ring can rotate and move laterally on the outer surface of the jacket group, so that the first scraping mechanism and the second scraping mechanism can respectively scrape off the deposits on the outer surface of the straight pipe and the inner wall of the jacket group, avoiding the accumulation of deposits contained in the heating medium flow that affect the heat exchange treatment of the outer jacket and the jacket group.

[0021] 3. By using the detachable sealing end of the jacket assembly and the sealing method between the inner jacket and the jacket cover, the first scraping mechanism installed on the sleeve block mechanism and the second scraping mechanism installed on the ring sleeve assembly can be replaced. Regularly replacing the first and second scraping mechanisms can avoid the situation where the scraping is incomplete due to wear of the first and second scraping mechanisms.

[0022] 4. By opening the threaded groove, when the ring sleeve group pushes the inner threaded ring to move laterally on the surface of the straight pipe, the inner threaded ring can rotate in the opening direction of the threaded groove, so that the first scraper plate can tangentially scrape off the attachments on the surface of the straight pipe, thereby improving the scraping efficiency of the attachments.

[0023] In summary, this invention overcomes the shortcomings of the prior art, has a reasonable design, and optimizes the handling of icing in the heat exchange jacket due to flow interruption and insufficient flow, avoiding uneven heating and overpressure inside the tube. It also regularly scrapes off the deposits on the heat exchange tube wall to prevent the accumulation of deposits from reducing the heat exchange efficiency of the tube wall, and has high social use value and application prospects. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 For this Figure 1A front sectional view of the structure;

[0027] Figure 3 For this Figure 2 Enlarged view of the local structure at point A;

[0028] Figure 4 This is a partial structural diagram of the present invention;

[0029] Figure 5 For this Figure 4 A front sectional view of the structure;

[0030] Figure 6 For this Figure 4 Internal structure diagram;

[0031] Figure 7 This is a partial exploded view of the structure of the present invention;

[0032] Figure 8 This is a schematic diagram showing the structural installation positions of the first scraping mechanism and the second scraping mechanism in this invention;

[0033] Figure 9 This is a schematic diagram of the ring assembly in this invention;

[0034] Figure 10 This is a schematic diagram of the structure of the second scraping mechanism in this invention;

[0035] Figure 11 This is a schematic diagram of the assembly of the sleeve mechanism and the first scraping mechanism in this invention;

[0036] Figure 12 This is a schematic diagram showing the installation position of the locking mechanism in this invention;

[0037] Figure 13 This is a schematic diagram of the installation mechanism in this invention;

[0038] Figure 14 This is a schematic diagram of the structure of the first scraping mechanism in this invention.

[0039] In the diagram: 1. Vaporization pipe; 101. Straight pipe; 1011. Threaded groove; 1012. Washer ring; 102. Bend; 103. Jacket assembly; 1031. Inner jacket; 1032. Jacket cover; 104. First jacket connecting pipe; 2. Outer jacket; 201. Second jacket connecting pipe; 3. Drain pipe; 4. Vent pipe; 5. Drive motor; 51. Rotating shaft; 6. Sleeve block mechanism; 61. Inner threaded collar; 62. Movable collar; 63. Mounting mechanism; 6301. Mounting base; 6302. Accessories 6303, Inset groove; 6304, Guide bar; 64, Locking mechanism; 6401, Locking rod; 6402, Baffle; 6403, Push plate; 6404, Sealing arc plate; 6405, Spring; 65, Sealing cover; 7, First scraping mechanism; 701, First scraping base; 702, First scraping plate; 703, Locking hole; 8, Ring sleeve assembly; 801, Main ring sleeve; 802, Slider; 9, Second scraping mechanism; 901, Second scraping base; 902, Second scraping plate. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Example 1

[0042] Reference Figure 1-14 A serpentine pipe vaporization system for liquefied petroleum gas (LPG) includes a vaporization pipe 1, which includes a straight pipe 101 and a bend 102 connected in sequence. The straight pipe 101 is provided with a jacket assembly 103 to provide heat exchange. The jacket assembly 103 includes an inner jacket 1031 sleeved outside the straight pipe 101 and a jacket cover 1032 to provide a sealing function for the inner jacket 1031. The inner jacket 1031 is connected to a first jacket connecting pipe 104 to transport the heating medium inside. The LPG enters from the straight pipe 101 at the bottom of the vaporization pipe 1, flows through the inside of the straight pipe 101 and the bend 102, and is discharged from the straight pipe 101 at the top of the vaporization pipe 1, so that the LPG can be vaporized into gas.

[0043] The inner jacket 1031 is fitted with an outer jacket 2 to provide heating. The outer jacket 2 is connected to a second jacket connecting pipe 201 to provide a flow channel for the heating medium inside. When the heating medium in the jacket assembly 103 is interrupted or the flow is insufficient, which may cause the water in the jacket to freeze, the heating medium can be introduced into the outer jacket 2. The flow of the heating medium can be used to heat the frozen parts in the jacket assembly 103, so as to avoid uneven heating and the occurrence of overpressure due to the presence of liquefied gas in the straight pipe 101.

[0044] A vent pipe 4 is connected to the outer sleeve 2 at the bottom of the vaporization pipe 1, and a drain pipe 3 is connected to the outer sleeve 2 at the top of the vaporization pipe 1.

[0045] Specifically, the end of the straight pipe 101 is provided with a gasket 1012 that cooperates with the jacket cover 1032 to provide a sealing treatment for the inner jacket 1031. The surface of the straight pipe 101 is provided with a threaded groove 1011. The gasket 1012 provides a sealing installation condition for the jacket cover 1032 installed at the end of the inner jacket 1031, so that the installation between the jacket cover 1032 and the inner jacket 1031 can be set to be detachable, which facilitates the replacement of the first scraping mechanism 7 and the second scraping mechanism 9 installed on the sleeve block mechanism 6 and the ring sleeve assembly 8.

[0046] Specifically, the straight pipe 101 is provided with a sleeve block mechanism 6 that matches the threaded groove 1011. The sleeve block mechanism 6 includes an inner threaded collar 61 sleeved on the outside of the threaded groove 1011. A movable collar 62 is movably sleeved on the inner threaded collar 61. Both ends of the movable collar 62 are provided with mounting mechanisms 63. When the sleeve block mechanism 6 does not need to cooperate with the first scraping mechanism 7 and the second scraping mechanism 9 to scrape the outer wall of the straight pipe 101 and the inner wall of the jacket assembly 103, the position of the sleeve block mechanism 6 on the straight pipe 101 is moved laterally to the position furthest from the drive motor 5 by the drive motor 5 and the rotating shaft 51, so that the sleeve block mechanism 6, the first scraping mechanism 7, the collar assembly 8 and the second scraping mechanism 9 will not affect the flow of the heating medium inside the jacket assembly 103.

[0047] Specifically, the installation mechanism 63 includes a mounting base 6301 that is fixedly connected to the movable collar 62. The mounting base 6301 is provided with a first scraping mechanism 7 for scraping off the surface of the straight pipe 101. The mounting base 6301 is also provided with an embedded groove 6303 for installing the first scraping mechanism 7 and an accessory compartment 6302. The installation mechanism 63 is designed to facilitate the installation and disassembly of the first scraping mechanism 7 in conjunction with the locking mechanism 64, and to facilitate the periodic replacement of the first scraping mechanism 7. This avoids excessive wear at the end of the first scraping plate 702 that contacts the straight pipe 101, which would reduce the scraping efficiency.

[0048] Specifically, the accessory compartment 6302 is equipped with a locking mechanism 64 for fixing the first scraping mechanism 7. The locking mechanism 64 includes a locking rod 6401 for inserting into the first scraping mechanism 7. The other end of the locking rod 6401 is equipped with a baffle 6402 located in the accessory compartment 6302, and a push plate 6403 for pushing the baffle 6402 to move within the accessory compartment 6302. The push plate 6403 is equipped with a sealing arc plate 6404 to prevent the heating medium from entering the accessory compartment 6302. The other side of the baffle 6402 is connected to a spring 6405 fixed to the inner wall of the baffle 6402. The locking mechanism 64 facilitates the locking operation of the installation position of the first scraping mechanism 7, and the sealing arc plate 6404 can prevent the heating medium flowing in the jacket assembly 103 from entering the accessory compartment 6302.

[0049] Specifically, the first scraping mechanism 7 includes a first scraping base 701 embedded in the inner groove 6303. The first scraping base 701 is provided with a first scraping plate 702 for scraping off the surface of the straight tube 101. The first scraping base 701 is also provided with a locking hole 703 for inserting a locking rod 6401. The part of the first scraping plate 702 that contacts the surface of the straight tube 101 is made of silicone material, which can prevent damage to the surface of the straight tube 101 when scraping the surface of the straight tube 101. After a certain period of use, the first scraping plate 702 will show signs of aging and wear, and needs to be replaced in conjunction with the installation mechanism 63 and the locking mechanism 64.

[0050] Specifically, the movable collar 62 is provided with a collar assembly 8, which includes a main collar 801 that is movably fitted with the movable collar 62. The outer sleeve 2 is provided with a drive motor 5 for driving the main collar 801 to move laterally. The output shaft of the drive motor 5 is provided with a rotating shaft 51. The collar assembly 8 also includes a slider 802 for matching the rotating shaft 51. The arrangement of the collar assembly 8, in conjunction with the driving action of the drive motor 5 on the rotating shaft 51, allows the slider 802 and the rotating shaft 51 to be assembled in a screw-type manner. When the rotating shaft 51 rotates, the slider 802 can drive the main collar 801 to move laterally along the axis of the rotating shaft 51. According to the rotation direction of the rotating shaft 51, the direction of the lateral movement of the collar assembly 8 and the sleeve block mechanism 6 is adjusted accordingly.

[0051] Specifically, the bottom surface of the parts compartment 6302 is provided with a guide strip 6304 to provide guidance and balance for the baffle 6402, and the mounting base 6301 is provided with a sealing cover 65 to provide a sealing function for the parts compartment 6302. The sealing cover 65, together with the guide strip 6304, provides guidance and balance for the baffle 6402. The baffle 6402 is provided with a groove that matches the guide strip 6304 and the sealing cover 65, so that when the baffle 6402 is driven by the push plate 6403 to move in the parts compartment 6302, it can be pushed in a balanced manner.

[0052] Example 2

[0053] Reference Figure 3 , Figure 7 , Figure 8 and Figure 10 The difference between this embodiment and Embodiment 1 is that the main ring sleeve 801 is provided with a second scraping mechanism 9 for scraping off the deposits on the inner wall of the jacket assembly 103. The second scraping mechanism 9 includes a second scraping base 901 fixed to the surface of the main ring sleeve 801. The second scraping base 901 is provided with a second scraping plate 902 that contacts the inner wall of the jacket assembly 103. The second scraping mechanism 9 can move synchronously with the main ring sleeve 801, so that after the second scraping plate 902 contacts the inner wall of the jacket assembly 103, and moves synchronously with the displacement, the second scraping plate 902 can effectively scrape off the deposits on the inner wall of the jacket assembly 103. The end of the second scraping plate 902 that contacts the inner wall of the jacket assembly 103 is made of silicone material to avoid wear on the inner wall of the jacket assembly 103 by the second scraping plate 902 during the scraping operation, and can be replaced periodically.

[0054] Other undescribed structures are described in Example 1.

[0055] Working Principle: In this invention, liquefied petroleum gas (LPG) flows within the vaporization pipe 1. During this flow, a heating medium is introduced into the jacket assembly 103 via the first jacket connecting pipe 104 on the bottom jacket assembly 103. The temperature of the heating medium is controlled between 20°C and 40°C, allowing heat exchange through the heat transfer from the inner wall of the straight pipe 101. This enables the LPG to vaporize during its flow within the vaporization pipe 1. If the heating medium experiences interruption or insufficient flow within the jacket assembly 103, the heating medium will be vaporized. When the heating medium freezes, the heating medium is introduced into the outer jacket 2 through the second jacket connecting pipe 201 located at the bottom of the outer jacket 2. The heating medium heats the inner wall of the jacket assembly 103, allowing the frozen parts inside the jacket assembly 103 to melt. After the freezing problem of the heating medium inside the jacket assembly 103 is solved, the vent pipe 4 and drain pipe 3 are opened to directly discharge and collect the heating medium flowing in the outer jacket 2 for future use. After the vaporization pipeline 1 has been used for a period of time, the flow of liquefied gas in the vaporization pipeline 1 is stopped. The heating medium inside the jacket assembly 103 is circulated, and then the drive motor 5 is started, so that the rotation of the shaft 51 can drive the main ring sleeve 801 to move laterally left and right inside the jacket assembly 103, thereby driving the inner threaded sleeve 61 to rotate and move laterally on the outer wall of the straight pipe 101, so that the first scraping plate 702 can scrape off the material attached to the surface of the straight pipe 101. At the same time, the movement of the main ring sleeve 801 will drive the second scraping plate 902 to scrape off the attached material on the inner wall of the outer jacket 2. After the scraping is completed, cleaning water is introduced into the jacket assembly 103 to make... The attachments scraped off by the first scraper 702 and the second scraper 902 will be carried out from inside the jacket assembly 103 by the flushing and flow of water. Then, the sleeve block mechanism 6 is moved to a position away from the drive motor 5 by the drive motor 5 and the rotating shaft 51, so that the sleeve block mechanism 6 and its connected components will not affect the flow of the heating medium inside the jacket assembly 103. When it is necessary to replace the first scraper mechanism 7 and the second scraper mechanism 9, the jacket cover 1032 is opened and the first scraper mechanism 7 and the second scraper mechanism 9 are replaced.

[0056] In the description of this invention, it should 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," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0057] In this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "link," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0058] The control method of this invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the art. Furthermore, since this invention is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail here.

[0059] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A serpentine pipe vaporization system for liquefied petroleum gas (LPG), comprising a vaporization pipe (1), characterized in that: The vaporization pipe (1) includes a straight pipe (101) and a bend (102) connected in sequence. The straight pipe (101) is provided with a jacket assembly (103) to provide heat exchange. The jacket assembly (103) includes an inner jacket (1031) sleeved outside the straight pipe (101) and a jacket cover (1032) to provide a sealing function for the inner jacket (1031). The inner jacket (1031) is connected to the heating medium inside through a first jacket connecting pipe (104). The inner jacket (1031) is fitted with an outer jacket (2) to provide heating, and the outer jacket (2) is connected to a second jacket connecting pipe (201) to provide a flow channel for the heating medium inside. The outer sleeve (2) at the bottom of the vaporization pipe (1) is connected to a vent pipe (4), and the outer sleeve (2) at the top of the vaporization pipe (1) is connected to a drain pipe (3). The end of the straight pipe (101) is provided with a gasket (1012) that provides a sealing treatment for the inner jacket (1031) with a matching jacket cover (1032), and a threaded groove (1011) is provided on the surface of the straight pipe (101). The straight pipe (101) is provided with a sleeve block mechanism (6) that matches the threaded groove (1011). The sleeve block mechanism (6) includes an inner threaded collar (61) sleeved on the outside of the threaded groove (1011). A movable collar (62) is movably sleeved on the inner threaded collar (61). Both ends of the movable collar (62) are provided with mounting mechanisms (63). The installation mechanism (63) includes a mounting base (6301) fixedly connected to the movable collar (62), a first scraping mechanism (7) for scraping off the surface of the straight pipe (101) on the mounting base (6301), an inner groove (6303) for installing the first scraping mechanism (7) on the mounting base (6301), and an accessory compartment (6302). The accessory compartment (6302) is provided with a locking mechanism (64) for fixing the first scraping mechanism (7). The locking mechanism (64) includes a locking rod (6401) for inserting into the first scraping mechanism (7). The other end of the locking rod (6401) is provided with a baffle (6402) located in the accessory compartment (6302) and a push plate (6403) for pushing the baffle (6402) to move in the accessory compartment (6302). The push plate (6403) is provided with a sealing arc plate (6404) to prevent the heating medium from entering the accessory compartment (6302). The other side of the baffle (6402) is connected to a spring (6405) fixed to the inner wall of the baffle (6402). The bottom surface of the parts compartment (6302) is provided with a guide strip (6304) to provide guidance and balance for the baffle (6402). The mounting base (6301) is provided with a sealing cover (65) to provide a sealing function for the parts compartment (6302). The sealing cover (65) works with the guide strip (6304) to provide guidance and balance for the baffle (6402). The baffle (6402) is provided with a groove that matches the guide strip (6304) and the sealing cover (65) so that when the baffle (6402) is driven by the push plate (6403) to move in the parts compartment (6302), it can be pushed in a balanced manner. The movable collar (62) is provided with a collar assembly (8), which includes a main collar (801) that is movably fitted with the movable collar (62). The outer sleeve (2) is provided with a drive motor (5) for driving the main collar (801) to move laterally, and the output shaft of the drive motor (5) is provided with a rotating shaft (51). The first scraping mechanism (7) includes a first scraping base (701) embedded in an inner groove (6303), a first scraping plate (702) for scraping off the attachments on the surface of the straight tube (101) is provided on the first scraping base (701), and a locking hole (703) for inserting a locking rod (6401) is also provided on the first scraping base (701).

Images