Intelligent automatic assembly station for suction pipe of refrigeration compressor suction muffler

Abstract

A kind of suction pipe intelligent automatic assembly station of refrigeration compressor suction muffler, including workbench, the upper portion of which is equipped with rotary disc driving mechanism;Rotary disc, connected with rotary disc driving mechanism;A set of suction pipe bearing mode, is fixed in the edge position of the side of rotary disc towards upper portion in equal interval state;Suction pipe lower pipe piece extraction release mechanism, suction pipe lower pipe piece absence and presence detection mechanism, suction pipe upper pipe piece extraction release mechanism, suction pipe pressing mechanism, suction pipe finished product lifting mechanism, stagnation suction pipe detection mechanism, stagnation suction pipe taking-off mechanism and stagnation suction pipe left and presence again detection mechanism are arranged on the workbench in the state of being spaced around rotary disc and being empty in the upper portion of rotary disc.The advantages are:small size, reduce the occupation of space;Integrating degree is good and can guarantee assembly efficiency and assembly quality;Ensure the automatic assembly action of each station;Convenient to exclude the factors leading to temporary shutdown, convenient inspection.

Description

Technical Field

[0001] This utility model belongs to the field of automation equipment technology, specifically relating to an intelligent automated assembly station for the intake pipe of a refrigeration compressor intake muffler. Background Technology

[0002] The function of the suction silencer of a refrigeration compressor is well known. In summary, it reduces the heating effect of the refrigerant when the compressor heats up and reduces the noise and vibration caused by pressure pulsation during the refrigerant gas flow, thereby helping to reduce the operating noise of the compressor and reducing the negative impact on the compressor efficiency.

[0003] Numerous technical information related to suction silencers for refrigeration compressors can be found in publicly available Chinese patent documents. Typical examples include CN104110358A, which recommends "suction silencer and compressor having the same," and CN116006434A, which provides "suction silencer for refrigeration compressor with replaceable inlet and outlet pipes," etc.

[0004] With the increasing scarcity of social labor resources, rising labor costs, and the growing pursuit of manufacturing efficiency and stringent quality requirements, the traditional manual assembly method for refrigeration compressor suction mufflers is becoming increasingly incompatible with these demands. Automated assembly equipment can solve these problems. However, the suction pipe (also called the "connecting pipe" or "air guide pipe," hereinafter the same), a key component of the refrigeration compressor suction muffler, has a relatively unique shape (see the two patents mentioned above). Therefore, to meet the requirements of automated assembly, a reasonably structured automated assembly station is needed. However, the aforementioned automated assembly station is non-standard equipment. Non-standard equipment refers to equipment with specific characteristics for assembling a particular workpiece or product. The desired technical inspiration cannot be found in publicly available patents and non-patent documents. Therefore, manufacturers of refrigeration compressor suction mufflers must either design and manufacture the equipment themselves or design it and then outsource its manufacture to equipment manufacturers with manufacturing capabilities. The technical solution described below arose under this background. Utility Model Content

[0005] The objective of this utility model is to provide an intelligent automated assembly station for the intake pipe of a refrigeration compressor intake muffler, which helps to reasonably control the volume and reduce the space occupied in the assembly work area, meets the workstation layout requirements required throughout the assembly process to achieve good integration and ensure assembly efficiency and quality, helps to avoid mutual interference between mechanical parts at adjacent workstations to eliminate factors that hinder the smooth progress of assembly, and facilitates online troubleshooting and convenient periodic or irregular maintenance to achieve a long service life.

[0006] The present invention accomplishes its objective as follows: An intelligent automated assembly station for the suction pipe of a refrigeration compressor suction muffler includes a workbench supported on the floor of the work area, with a rotary disc drive mechanism mounted on its upper part; a rotary disc positioned above the rotary disc drive mechanism and its center fixedly connected to the mechanism; a set of eight suction pipe support molds, fixed at equal intervals of 45° between adjacent molds on the upward-facing edge of the rotary disc; and suction pipe extraction and release mechanisms arranged counter-clockwise around the rotary disc and suspended above it on the workbench for extracting and releasing the lower suction pipe section input from the suction pipe section input track onto the suction pipe support molds, and for detecting the suction pipe... The system includes: a mechanism for detecting the absence of a lower suction tube segment on the support mold; a suction tube upper segment extraction and release mechanism for extracting and releasing the upper suction tube segment input from the upper suction tube segment input track onto the suction tube support mold carrying the lower suction tube segment, ensuring face-to-face engagement between the upper and lower suction tube segments; a suction tube pressing mechanism for pressing the upper and lower suction tube segments together to form a finished suction tube; and a suction tube lifting mechanism for removing the finished suction tube from the suction mold. The system includes a suction pipe lifting mechanism that lifts the suction pipe finished product from the suction pipe bearing mold and supplies it to the suction pipe finished product outlet slot set at an incline on the worktable; a suction pipe retention detection mechanism that detects whether there is any suction pipe retained on the suction pipe bearing mold; a suction pipe removal mechanism that removes the retained suction pipe from the suction pipe bearing mold and supplies it to the suction pipe outlet slot set at an incline on the worktable; and a suction pipe retention re-detection mechanism that re-detects whether there is any retained suction pipe remaining on the suction pipe bearing mold.

[0007] In a specific embodiment of this utility model, the workbench has a box-shaped structure with a workbench cavity. A workbench cavity protective door is provided on the front and / or rear side of the workbench for opening or closing the workbench cavity. A main power control switch is provided on the left or right cavity wall of the workbench cavity. An air filter device is provided on the left side of the workbench cavity for filtering the pressurized air from the pressurized air generation device. A pressurized air pipeline passage hole is provided on the workbench surface for the pipeline that provides pressurized air to the working cylinder to pass through.

[0008] In another specific embodiment of this utility model, the set of suction pipe support molds is fixed radially on the edge of the rotating disk facing upward.

[0009] In another specific embodiment of this utility model, one end of the set of suction pipes supporting the mold, which is away from the center of the rotating disk, protrudes from the outer surface of the rotating disk.

[0010] In another specific embodiment of this utility model, the end of the lower intake pipe input track away from the rotary disk is connected to the lower intake pipe vibrator; the end of the upper intake pipe input track away from the rotary disk is connected to the upper intake pipe vibrator.

[0011] In another specific embodiment of this utility model, an electrical controller that is electrically connected to the rotary disc drive mechanism is provided on the workbench.

[0012] In a further specific embodiment of this utility model, the inhalation tube missing / not missing section detection mechanism includes an inhalation tube missing / not missing section detection sensor mounting post, an inhalation tube missing / not missing section detection sensor mounting base, and an inhalation tube missing / not missing section detection sensor. The inhalation tube missing / not missing section detection sensor mounting post is arranged longitudinally, with its lower end fixed to the worktable, while its upper end extends upward away from the worktable. The inhalation tube missing / not missing section detection sensor mounting base is fixed to the inhalation tube missing / not missing section detection sensor mounting post with the upper edge of the rotating disk facing upward, adjustable vertically by mounting base screws. At the end of the sensor mounting base for detecting the absence or non-absence of the lower inhalation tube segment, a sensor position adjustment guide block is formed on the upper part of the end away from the rotating disk. The sensor for detecting the absence or non-absence of the lower inhalation tube segment is adjusted and mounted on the sensor mounting base at a position corresponding to the sensor position adjustment guide block. The detection head of the sensor for detecting the absence or non-absence of the lower inhalation tube segment is located above the inhalation tube support mold. The sensor for detecting the absence or non-absence of the lower inhalation tube segment is electrically connected to the electrical controller via a circuit in the use state. The structure of the residual inhalation tube detection mechanism and the residual inhalation tube re-detection mechanism is the same as the structure of the sensor for detecting the absence or non-absence of the lower inhalation tube segment.

[0013] One of the technical effects of the present invention is that, due to the smaller size of the workbench, the space occupied by the intelligent automated assembly station for suction pipes can be reduced. Secondly, because the rotary disc drive mechanism on the workbench causes the rotary disc and a set of suction pipe support molds to rotate rhythmically, and because there are eight processes required to obtain the finished suction pipes, including inspection, eight suction pipe support molds are fixed at equal intervals of 45° between each pair of adjacent molds on the circumference of the rotary disc. This facilitates meeting the station layout requirements throughout the assembly process, demonstrating good integration and ensuring assembly efficiency and quality. Thirdly, because the mechanisms for each station are positioned reasonably around the edge of the rotary disc on the workbench, there will be no mutual interference, ensuring the smooth operation of the automated assembly at each station. Fourthly, because the functional mechanisms for each station are exposed, it is convenient to eliminate factors that could cause temporary shutdowns and to facilitate regular or irregular inspections. Attached Figure Description

[0014] Figure 1 This is a structural diagram of an embodiment of the present utility model. Detailed Implementation

[0015] Please see Figure 1The diagram shows a workbench 10, which is supported on the floor of the work area, i.e., the intelligent automated assembly area for suction pipes, in use. A rotary disc drive mechanism 101 is installed on the upper part of the workbench 10. A rotary disc 1 is shown, which is located above the rotary disc drive mechanism 101 and is fixedly connected to the rotary disc drive mechanism 101 at its center so that it can be driven to rotate by the rotary disc drive mechanism 101. A set of eight suction pipe support molds 2 is shown, which are fixed to the edge of the rotary disc 1 facing upwards at equal intervals of 45° between each pair of adjacent suction pipe support molds 2 around the circumference of the rotary disc 1. A series of suction pipe support molds are shown, arranged counterclockwise around the rotary disc 1 and suspended above the rotary disc 1 on the workbench 10. The suction pipe lower pipe segment 20 input from the suction pipe lower pipe segment input track 80a is used to extract and release the suction pipe lower pipe segment onto the aforementioned suction pipe support mold 2. The suction pipe lower pipe segment extraction and release mechanism 3 is used to detect whether there is a suction pipe lower pipe segment 20 on the suction pipe support mold 2. 4. A mechanism for detecting the absence of the lower suction tube segment; 5. A suction tube extraction and release mechanism for extracting and releasing the upper suction tube segment 30 input from the upper suction tube segment input track 80b onto the suction tube support mold 2 carrying the lower suction tube segment 20, and for making the upper suction tube segment 30 and the lower suction tube segment 20 face to face; 6. A suction tube pressing mechanism for pressing the upper suction tube segment 30 and the lower suction tube segment 20 into a whole to form the finished suction tube 40; 7. A suction tube lifting mechanism for lifting the finished suction tube 40 away from the suction tube support mold 2 and supplying it to the suction tube. The system includes a suction pipe lifting mechanism 7 that outputs suction pipe finished product from suction pipe finished product outlet 106, which is set in an inclined state on the worktable 10; a suction pipe retention detection mechanism 8 that detects whether there is any suction pipe 50 left on the suction pipe bearing mold 2; a suction pipe removal mechanism 9 that removes the suction pipe 50 from the suction pipe bearing mold 2 and supplies it to the suction pipe retention outlet 107, which is set in an inclined state on the worktable 10; and a suction pipe retention re-detection mechanism 60 that re-detects whether there is any remaining suction pipe 50 on the suction pipe bearing mold 2.

[0016] Depend on Figure 1As shown, the aforementioned workbench 10 provided by this utility model has a box-shaped structure with a workbench cavity. A workbench cavity protective door 102 for opening or closing the workbench cavity is provided on the front side of the workbench 10. A main power control switch 103 is provided on the left or right cavity wall of the workbench cavity. An air filter device 104 for filtering the pressurized air from the pressurized air generating device is provided on the left side of the workbench cavity. A pressurized air pipeline passage hole 105 is provided on the table surface of the workbench 10 for the pipeline that provides pressurized air to the working cylinder to pass through. As a preferred embodiment, a set (four in this embodiment) of support feet 108 with the function of adjusting the level of the workbench 10 can also be provided at the bottom of the workbench 10.

[0017] The applicant should note that in this embodiment, the workbench cavity shielding door 102 is set on the front side of the workbench 10, but it can also be set on the rear side, or even on both the front and rear sides.

[0018] Please stay tuned. Figure 1 The aforementioned set of suction pipe support molds 2 are fixed radially on the edge of the rotating disk 1 facing upward.

[0019] One end of the aforementioned set of suction pipe support mold 2, which is away from the center of the aforementioned rotating disk 1, protrudes from the outer surface 11 of the rotating disk 1.

[0020] The end of the aforementioned lower suction pipe input track 80a, facing away from the aforementioned rotary disk 1, is connected to a lower suction pipe vibrator (not shown in the figure); the end of the aforementioned upper suction pipe input track 80b, facing away from the rotary disk 1, is connected to an upper suction pipe vibrator (not shown in the figure). The upper and lower suction pipes 30 and 20 are obtained by upstream equipment such as a plastic injection molding machine through an injection mold.

[0021] An electrical controller 70, which is electrically connected to the aforementioned rotary disc drive mechanism 101, is provided on the aforementioned workbench 10.

[0022] Please stay tuned. Figure 1The aforementioned inhalation tube missing section detection mechanism 4 includes an inhalation tube missing section detection sensor mounting post 41, an inhalation tube missing section detection sensor mounting base 42, and an inhalation tube missing section detection sensor 43. The inhalation tube missing section detection sensor mounting post 41 is arranged longitudinally, and its lower end is fixed to the aforementioned worktable 10, while its upper end extends upward in a direction away from the worktable 10. The inhalation tube missing section detection sensor mounting base 42 is fixed to the upper end of the inhalation tube missing section detection sensor mounting post 41 with the mounting base screw 421 adjusting vertically, with the upper edge of the aforementioned rotary table 1 suspended above the upper edge. A sensor position adjustment guide block 422 is formed on the upper part of the end of the device fixing base 42 away from the rotary table 1. The sensor 43 for detecting whether the lower part of the inhalation tube is missing is adjusted and set on the sensor fixing base 42 for detecting whether the lower part of the inhalation tube is missing, corresponding to the position of the sensor position adjustment guide block 422. The sensor detection head 431 of the sensor 43 for detecting whether the lower part of the inhalation tube is missing corresponds to the upper part of the aforementioned inhalation tube support mold 2. The sensor 43 for detecting whether the lower part of the inhalation tube is missing is electrically connected to the aforementioned electrical controller 70 through a circuit in the use state. Since the structure of the aforementioned residual inhalation tube detection mechanism 8 and the residual inhalation tube retention re-detection mechanism 60 is the same as the structure of the sensor 4 for detecting whether the lower part of the inhalation tube is missing, the applicant will not describe them in detail.

[0023] Since the aforementioned suction pipe lower tube fragment extraction and release mechanism 3 is essentially the starting station, i.e., the first station, the aforementioned suction pipe lower tube fragment missing detection mechanism 4 is equivalent to the second station. When the suction pipe lower tube fragment 20 is missing from the suction pipe support mold 2 at the second station, i.e., at the station corresponding to the suction pipe lower tube fragment missing detection mechanism 4, that is, when the suction pipe lower tube fragment extraction and release mechanism 3 fails to release the suction pipe lower tube fragment 20 into the suction pipe support mold 2... In the above situation (the probability of this situation is extremely low), the detection sensor head 431 detects the absence of the lower suction tube segment and feeds the signal back to the electrical controller 70. The aforementioned rotary disc drive mechanism 101 stops working and is handled by the online operator or on-duty personnel, for example, by manually inserting a lower suction tube segment 20 into the suction tube support mold 2 that is missing the lower suction tube segment 20.

[0024] Applicant combined Figure 1Briefly describing the entire working process of this utility model, at the aforementioned suction tube lower tube fragment extraction and release mechanism 3 (which can be referred to as the first working position), the suction tube lower tube fragment 20, input by the suction tube lower tube fragment input track 80a, is extracted and placed into the suction tube bearing mold 2 on the rotary table 1. When the suction tube bearing mold 2 on the rotary table 1 carrying the suction tube lower tube fragment 20 rotates to the position corresponding to the suction tube lower tube fragment missingness detection mechanism 4, which serves as the second working position, it is processed in the manner described by the applicant above. When the suction pipe support mold 2 carrying the lower suction pipe segment 20 rotates to the position of the suction pipe upper pipe segment extraction and release mechanism 5, which serves as the third station, the suction pipe upper pipe segment extraction and release mechanism 5 will extract and release the suction pipe upper pipe segment 30 input from the suction pipe upper pipe segment input track 80b in a manner similar to that of the suction pipe lower pipe segment extraction and release mechanism 3, and then fasten it onto the lower suction pipe segment 20 in a face-to-face state. When the rotary table 1 rotates the suction pipe support mold 2, which carries the upper and lower suction pipe segments 30 and 20 in a mating state, to the position of the suction pipe pressing mechanism 6 (the fourth station), the suction pipe pressing mechanism 6 presses the upper and lower suction pipe segments 30 and 20 together with a mortise and tenon-like fit (the lower suction pipe segment 20 has a columnar flange, and the upper suction pipe segment 30 has a columnar flange fitting hole corresponding to the columnar flange) to form the suction pipe finished product 40. Next, when the rotary table 1 rotates the suction pipe support mold 2 carrying the suction pipe finished product 40 to the suction pipe finished product lifting mechanism 7 (the fifth station), the mechanism lifts and releases the suction pipe finished product 40 into the suction pipe finished product outlet groove 106, from which it is discharged. The aforementioned upper and lower suction pipe segments 30 and 20 are obtained from the previous molding process.

[0025] Normally, the suction pipe bearing mold 2, which leaves the suction pipe finished product lifting mechanism 7 as the rotary table 1 rotates, should be in an empty mold state. The so-called empty mold state means that there are no workpieces, that is, there are no suction pipe finished products 40 that have not been removed. However, the aforementioned empty mold state cannot be absolutely or foolproofly eliminated, because in the actual use of the equipment, either of the following two situations may occur: First, the suction pipe finished product 40 is not removed; second, due to the failure of the upper and lower pipe segments 30 and 20 to connect properly or the lack of reliability in pressing them together, the suction pipe finished product lifting mechanism 7 only lifts the upper pipe segment 30, while the lower pipe segment 20 remains on the suction pipe bearing mold 2. Therefore, as the rotary table 1 rotates and rotates to the position corresponding to the sixth station where the stagnant suction pipe detection mechanism 8 is located, the stagnant suction pipe detection mechanism 8 uses the same detection principle as the aforementioned suction pipe lower tube missing detection mechanism 4 to detect whether there is a stagnant suction pipe 50, and feeds back the signal of the presence of a stagnant part to the electrical controller 70. The electrical controller 70 sends a signal to the stagnant suction pipe removal mechanism 9, which is the seventh station. When the suction pipe bearing mold 2 with the stagnant suction pipe finished product 40 or suction pipe lower tube 20 is rotated to the position of the stagnant suction pipe removal mechanism 9, the stagnant suction pipe removal mechanism 9 extracts the stagnant part on the suction pipe bearing mold 2 and releases it into the stagnant suction pipe outlet groove 107, and it is then discharged from the stagnant suction pipe outlet groove 107. As the rotary table drive mechanism 101 continues to rotate the rotary table 1, the suction pipe support mold 2, which originally corresponded to the stuck suction pipe removal mechanism 9, is aligned with the position of the stuck suction pipe retention re-detection mechanism 60, which serves as the eighth station. If there are suction pipe finished products 40 or suction pipe lower segments 20 that have not been removed by the stuck suction pipe removal mechanism 9, then the stuck suction pipe retention re-detection mechanism 60 will handle them in the same way as the aforementioned suction pipe lower segment missing detection mechanism 4, and the operator will remove the stuck suction pipe from the suction pipe support mold 2. This process is repeated cyclically, and the operation of the entire equipment is achieved by the online operator (one person can simultaneously monitor multiple units of this utility model) by operating the corresponding buttons on the electrical controller 70. After the finished intake pipe 40 is assembled by this utility model, it is discharged from the intake pipe finished product outlet groove 106 and supplied to the subsequent process for assembly with the housing of the intake muffler.

[0026] In summary, the technical solution provided by this utility model makes up for the shortcomings of the prior art, successfully completes the invention task, and faithfully realizes the technical effects described by the applicant in the above technical effect column.

Claims

1. An intelligent automated assembly station for the suction pipe of a refrigeration compressor suction silencer, characterized in that: The system includes a workbench (10) supported on the floor of the work area during use, with a rotary disc drive mechanism (101) mounted on its upper part; a rotary disc (1) located above the rotary disc drive mechanism (101) and its center fixedly connected to the rotary disc drive mechanism (101); a set of eight suction pipe support molds (2) fixed at equal intervals of 45° between each pair of adjacent suction pipe support molds (2) on the upward-facing edge of the rotary disc (1); and a series of other components arranged counterclockwise around the rotary disc (1) and suspended above it on the workbench (10). The suction pipe lower pipe segment (20) input by the suction pipe lower pipe segment input track (80a) is used to extract and release the suction pipe lower pipe segment onto the suction pipe support mold (2), and to detect whether there is a suction pipe lower pipe segment (20) on the suction pipe support mold (2). The following are provided: a detection mechanism (4) for detecting the absence of the lower suction tube segment; a suction tube upper tube segment extraction and release mechanism (5) for extracting and releasing the upper suction tube segment (30) input from the upper suction tube segment input track (80b) onto the suction tube support mold (2) carrying the lower suction tube segment (20) and making the upper suction tube segment (30) and the lower suction tube segment (20) face to face; a suction tube pressing mechanism (6) for pressing the upper suction tube segment (30) and the lower suction tube segment (20) into a whole to form the finished suction tube product (40); and a suction tube pressing mechanism for lifting the finished suction tube product (40) away from the suction tube support mold (2) and supplying it to the suction tube. The system includes a suction pipe lifting mechanism (7) that outputs suction pipe finished product through the suction pipe finished product outlet slot (106) set on the workbench (10) in an inclined state, a suction pipe retention detection mechanism (8) for detecting whether there is a suction pipe (50) left on the suction pipe bearing mold (2), a suction pipe retention removal mechanism (9) for removing the suction pipe (50) from the suction pipe bearing mold (2) and supplying it to the suction pipe outlet slot (107) set on the workbench (10) in an inclined state, and a suction pipe retention re-detection mechanism (60) for re-detecting whether there is a residual suction pipe (50) left on the suction pipe bearing mold (2).

2. The intelligent automated assembly station for the suction pipe of the refrigeration compressor suction muffler according to claim 1, characterized in that: The workbench (10) has a box-shaped structure with a workbench cavity. A workbench cavity protective door (102) for opening or closing the workbench cavity is provided on the front and / or rear side of the workbench (10). A main power control switch (103) is provided on the left or right cavity wall of the workbench cavity. An air filter device (104) for filtering the pressurized air from the pressurized air generation device is provided on the left side of the workbench cavity. A pressurized air pipeline passage hole (105) is provided on the table surface of the workbench (10) for the pipeline that provides pressurized air to the working cylinder to pass through.

3. The intelligent automated assembly station for the suction pipe of the refrigeration compressor suction muffler according to claim 1, characterized in that: The set of suction pipe support molds (2) are fixed in a radial state on the edge of the rotating disk (1) facing upward.

4. The intelligent automated assembly station for the suction pipe of the refrigeration compressor suction muffler according to claim 1 or 3, characterized in that: One end of the suction pipe support mold (2) that is away from the center of the rotary disk (1) protrudes from the outer surface (11) of the rotary disk (1).

5. The intelligent automated assembly station for the suction pipe of the refrigeration compressor suction muffler according to claim 1, characterized in that: The end of the lower intake pipe input track (80a) opposite to the rotary disk (1) is connected to the lower intake pipe vibrator; the end of the upper intake pipe input track (80b) opposite to the rotary disk (1) is connected to the upper intake pipe vibrator.

6. The intelligent automated assembly station for the suction pipe of the refrigeration compressor suction muffler according to claim 1, characterized in that: An electrical controller (70) is provided on the worktable (10) and is electrically connected to the rotary disc drive mechanism (101).

7. The intelligent automated assembly station for the suction pipe of the refrigeration compressor suction muffler according to claim 6, characterized in that: The inhalation tube missing or missing segment detection mechanism (4) includes an inhalation tube missing or missing segment detection sensor mounting post (41), an inhalation tube missing or missing segment detection sensor mounting base (42), and an inhalation tube missing or missing segment detection sensor (43). The inhalation tube missing or missing segment detection sensor mounting post (41) is arranged in a longitudinal state, and the lower end of the inhalation tube missing or missing segment detection sensor mounting post (41) is fixed to the worktable (10), while the upper end extends upward in a direction away from the worktable (10). The inhalation tube missing or missing segment detection sensor mounting base (42) is fixed to the upper end of the inhalation tube missing or missing segment detection sensor mounting post (41) by mounting base screws (421) in a state where it is suspended above the edge of the rotating disk (1) facing upward. The upper part of the sensor mounting base (42) away from the rotating disk (1) is provided with a sensor position adjustment guide block (422). The sensor for detecting whether the lower part of the inhalation tube is missing or not is set on the sensor mounting base (422) in a position corresponding to the sensor position adjustment guide block (422). The sensor head (431) of the sensor for detecting whether the lower part of the inhalation tube is missing or not is located above the inhalation tube support mold (2). The sensor for detecting whether the lower part of the inhalation tube is missing or not is electrically connected to the electrical controller (70) through a line in the use state. The structure of the residual inhalation tube detection mechanism (8) and the residual inhalation tube retention re-detection mechanism (60) is the same as the structure of the sensor for detecting whether the lower part of the inhalation tube is missing or not.

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