A gradient feeder for powder material

Abstract

The present disclosure relates to the technical field of powder materials, and one embodiment of the present disclosure provides a gradient feeding device for powder material packaging, which comprises a processing tank, an upper end of the processing tank is provided with a feeding tank, a shock feeding assembly is arranged in the interior of the feeding tank, and a constant-frequency feeding assembly is arranged between the feeding tank and the processing tank; the shock feeding assembly comprises a feeding cover, a driving cam is in contact with a force receiving table, a side wall of the feeding tank is provided with a mounting rack, a shock motor is arranged on the mounting rack, an output end of the shock motor is inserted into the interior of the feeding tank, and the output end of the shock motor is fixedly connected with the driving cam. Through the above technical scheme, the technical problem that the traditional powder material feeding device in the prior art has many limitations, for example, the gravity type feeding device relies on the gravity falling of the material itself, and although the structure of this way is simple, the material is easy to appear caking and bridging phenomenon, which leads to uneven feeding, and affects the precision and quality of subsequent packaging.

Description

Technical Field

[0001] The embodiments of this disclosure relate to the field of powder technology, and more specifically, to a gradient feeding device for packaging powdered materials. Background Technology

[0002] In industrial production, the packaging of powdered materials is a crucial step, involving multiple fields such as food, chemicals, and pharmaceuticals. The background technology for gradient feeding devices used in powdered material packaging is as follows:

[0003] Traditional powder material feeding devices have many limitations. For example, gravity feeding devices rely on the material's own weight to fall. Although this method has a simple structure, the material is prone to clumping and bridging, resulting in uneven feeding and affecting the accuracy and quality of subsequent packaging. Screw conveyor feeding devices push materials through screw blades. However, for highly viscous or easily broken powder materials, such as milk powder and starch, it is easy to cause particle breakage, which changes the physical properties of the material and may also lead to uneven material density. Vibratory feeder feeding devices use vibration to make the material flow, but they are only suitable for small-dose, low-precision packaging and cannot meet the requirements of large-scale industrial production for feeding speed and accuracy.

[0004] With the development of technology and changes in market demand, modern industry has placed higher demands on the packaging of powdered materials. On the one hand, improving product quality requires more precise feeding control. In the production of food additives, pharmaceutical intermediates, and other products, it is necessary to precisely control the amount of each component added to ensure the stability and consistency of product quality. Traditional feeding devices are difficult to achieve precise mixing and gradient feeding of multiple materials. On the other hand, improving production efficiency is also a goal pursued by enterprises. The feeding speed and stability of traditional devices are insufficient, which limits the overall capacity of the production line and cannot meet the needs of large-scale production. In addition, in industries with high hygiene requirements such as food and pharmaceuticals, dust and residues during the feeding process can easily lead to cross-contamination. This requires the feeding device to have the characteristics of being closed and easy to clean in order to meet strict hygiene standards.

[0005] Currently, some improved feeding devices on the market attempt to solve the above problems, but there are still some shortcomings. For example, multi-stage vibrating feeding devices disperse materials through multiple vibrations, which can improve the uniformity of feeding to a certain extent, but they have problems such as high energy consumption and complex structure. Moreover, the vibration frequency is difficult to control precisely, which can easily lead to excessive material crushing. Rotary valve feeders can achieve quantitative conveying, but they are not adaptable to powdery materials with different characteristics, and they are not flexible enough when switching different materials or adjusting the feeding amount.

[0006] Therefore, in order to meet the requirements of modern industrial production for the packaging of powdered materials in terms of precision, efficiency and hygiene, it is necessary to develop a new type of gradient feeding device for packaging powdered materials, which can achieve precise gradient feeding, improve production efficiency, meet hygiene standards, and adapt to powdered materials with different characteristics. Utility Model Content

[0007] To overcome the above-mentioned defects, the embodiments of this disclosure provide a gradient feeding device for packaging powdered materials, which solves the many limitations of traditional powdered material feeding devices in the prior art. For example, gravity feeding devices rely on the material's own gravity to fall. Although this method has a simple structure, the material is prone to clumping and bridging, resulting in uneven feeding and affecting the accuracy and quality of subsequent packaging.

[0008] According to one aspect, at least one embodiment of the present disclosure provides a gradient feeding device for packaging powdered materials, comprising:

[0009] A processing tank, wherein a feed tank is provided at the upper end of the processing tank;

[0010] An oscillating feed assembly is disposed inside the feed tank;

[0011] A constant frequency feeding assembly is disposed between the feeding tank and the processing tank;

[0012] The oscillating feeding assembly includes a feeding hood embedded inside the processing tank. A connector is provided at the lower end of the feeding hood. A connecting sleeve is provided inside the feeding tank, and the connector is inserted into the connecting sleeve. A force-bearing platform is provided at the lower end of the outer wall of the feeding hood, and a drive cam is provided at the lower end of the force-bearing platform. The drive cam is in contact with the force-bearing platform. A mounting frame is provided on the side wall of the feeding tank, and an oscillating motor is mounted on the mounting frame. The output end of the oscillating motor is inserted into the feeding tank and fixedly connected to the drive cam.

[0013] As a further technical solution, the side wall of the feed hood is provided with a connecting frame, and the inner side wall of the connecting frame is provided with a drive wheel, which is in contact with the inner side wall of the feed tank.

[0014] As a further technical solution, the fixed-frequency feeding assembly includes a connecting pipe, which is disposed on the upper end face of the processing tank. The lower end of the feeding tank is fixedly connected to the connecting pipe. A fixing frame is provided on the side wall of the connecting pipe. A rotary motor is disposed inside the fixing frame. The output end of the rotary motor is inserted into the interior of the connecting pipe. A feeding ball is fitted onto the output end of the rotary motor. A feeding cavity is opened on the side wall of the feeding ball.

[0015] As a further technical solution, the inner sidewall of the plug sleeve is provided with a positioning groove, and the outer sidewall of the plug tube is provided with a positioning slide bar, the positioning slide bar being embedded inside the positioning groove.

[0016] As a further technical solution, the rotary motor is fitted with a motor sleeve, and the motor sleeve is fixedly connected to the fixing frame.

[0017] As a further technical solution, the number of feeding chambers is two, and the two feeding chambers are located at opposite ends of the feeding ball.

[0018] As a further technical solution, an auxiliary supply tank is provided on the side wall of the processing tank, and the feeding ratio between the auxiliary supply tank and the feed tank is 1:9.

[0019] As a further technical solution, the connecting tube and the insertion tube are sealed together, and the diameters of the connecting tube and the insertion tube are matched.

[0020] The beneficial effects of the embodiments disclosed herein are as follows:

[0021] 1. In this disclosure, the device can accurately control the feeding amount and feeding speed of powdered materials through the synergistic effect of the oscillating feeding component and the fixed frequency feeding component. The oscillating motor drives the cam to rotate, causing the feeding hood to oscillate regularly, effectively breaking up material agglomeration and bridging, and ensuring that the material falls evenly.

[0022] 2. In this disclosure, the dynamic dispersion design of the oscillating feed assembly reduces the risk of material blockage and avoids production interruptions caused by shutdown for cleaning. The rotating spherical structure of the fixed-frequency feed assembly adopts a sealed plug-in design (the diameter of the connecting pipe and the plug pipe are matched and sealed), which not only reduces dust leakage but also facilitates disassembly and cleaning, meeting the hygiene standards of the food and pharmaceutical industries. In addition, the positioning groove and positioning slide bar structure in the device ensures stable oscillation of the feed hood, reduces mechanical wear, and extends the service life of the equipment. The independent configuration of the auxiliary supply tank can flexibly adapt to the feeding needs of different materials without frequent replacement of the main structure, reducing equipment modification costs and maintenance difficulty. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0024] Figure 1This is a schematic diagram of a structure in one embodiment of the present disclosure;

[0025] Figure 2 This is a cross-sectional view of the feed tank disclosed herein;

[0026] Figure 3 This is an isometric view of the feed hood disclosed herein;

[0027] Figure 4 This is a cross-sectional view of the feed tank from another perspective.

[0028] In the diagram: 1. Processing tank; 2. Feed tank; 3. Vibrating feed assembly; 3-1. Feed hood; 3-2. Insert pipe; 3-3. Insert sleeve; 3-4. Forced platform; 3-5. Drive cam; 3-6. Mounting frame; 3-7. Vibrating motor; 3-8. Connecting frame; 3-9. Drive wheel; 4. Fixed frequency feed assembly; 4-1. Connecting pipe; 4-2. Fixing frame; 4-3. Rotary motor; 4-4. Feed ball; 4-5. Feed chamber; 5. Positioning groove; 6. Positioning slide bar; 7. Motor sleeve; 8. Auxiliary supply tank. Detailed Implementation

[0029] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0030] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0031] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0032] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to 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 disclosure.

[0034] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] like Figures 1-4 As shown, a gradient feeding device for packaging powdered materials according to this disclosure is illustrated, comprising:

[0036] Processing tank 1, with a feeding tank 2 installed at the upper end of processing tank 1;

[0037] The oscillating feed assembly 3 is installed inside the feed tank 2;

[0038] A fixed-frequency feeding assembly 4 is installed between the feeding tank 2 and the processing tank 1;

[0039] The oscillating feed assembly 3 includes a feed hood 3-1, which is embedded inside the processing tank 1. A connector 3-2 is provided at the lower end of the feed hood 3-1. A connector sleeve 3-3 is provided inside the feeding tank 2. The connector 3-2 is inserted into the connector sleeve 3-3. A force-bearing platform 3-4 is provided at the lower end of the outer wall of the feed hood 3-1. A drive cam 3-5 is provided at the lower end of the force-bearing platform 3-4. The drive cam 3-5 is in contact with the force-bearing platform 3-4. A mounting frame 3-6 is provided on the side wall of the feeding tank 2. An oscillating motor 3-7 is provided on the mounting frame 3-6. The output end of the oscillating motor 3-7 is inserted into the feeding tank 2. The output end of the oscillating motor 3-7 is fixedly connected to the drive cam 3-5.

[0040] The fixed-frequency feeding assembly 4 includes a connecting pipe 4-1, which is located on the upper end face of the processing tank 1. The lower end of the feeding tank 2 is fixedly connected to the connecting pipe 4-1. A fixing frame 4-2 is provided on the side wall of the connecting pipe 4-1. A rotary motor 4-3 is installed inside the fixing frame 4-2. The output end of the rotary motor 4-3 is inserted into the interior of the connecting pipe 4-1. A feeding ball 4-4 is fitted onto the output end of the rotary motor 4-3. A feeding cavity 4-5 is opened on the side wall of the feeding ball 4-4.

[0041] In some examples, the oscillating feed assembly 3 is mainly used for preliminary processing of materials to prevent them from clumping and to ensure smooth subsequent feeding. After the oscillating motor 3-7, which is mounted on the side wall mounting frame 3-6 of the feed tank 2, starts working, it will drive the drive cam 3-5 to rotate. Since the drive cam 3-5 is in contact with the force-bearing platform 3-4 at the lower end of the outer side wall of the feed hood 3-1, the rotation of the drive cam 3-5 will cause the feed hood 3-1 to oscillate up and down. The key function of the fixed frequency feed assembly 4 is to realize the quantitative conveying of materials and ensure the stability of feeding. When the rotary motor 4-3 is working, it drives the feed ball 4-4 to rotate. The feed ball 4-4 has feed chambers 4-5 at opposite ends. As the feed ball 4-4 rotates, the feed chambers 4-5 will periodically connect with the feed tank 2 and the processing tank 1, thereby realizing quantitative feeding.

[0042] First, the powdered material is fed into the feed tank 2. The vibrating motor 3-7 is then started, causing the feed hood 3-1 to vibrate up and down to agitate the material and prevent it from clumping, thus preparing it for subsequent feeding. Based on actual production needs, the auxiliary supply tank 8 will supply material to the processing tank 1 at a ratio of 1:9 to that of the feed tank 2, to meet different production process requirements. The power and speed of the vibrating motor 3-7 and the rotary motor 4-3 must be selected based on the overall scale of the equipment and the material processing volume. Insufficient motor power may not meet the equipment's operational needs; excessive motor power will result in energy waste. The feeding ratio of the auxiliary supply tank 8 to the feed tank 2 is 1:9. In practical applications, this ratio can be precisely controlled by adjusting the supply speed of the auxiliary supply tank 8 according to specific production process requirements.

[0043] like Figures 1-4 As shown in the figure, this embodiment proposes that the side wall of the feed hood 3-1 is provided with a connecting frame 3-8, and the inner side wall of the connecting frame 3-8 is provided with a drive wheel 3-9, which is in contact with the inner side wall of the feed tank 2.

[0044] In some examples, the drive wheel 3-9 set by the connecting frame 3-8 on the side wall of the feed hood 3-1 can roll along the inner side wall of the feed tank 2 during the oscillation of the feed hood 3-1, which plays a role in stabilizing the movement trajectory of the feed hood 3-1.

[0045] For example, such as Figure 2As shown, the inner wall of the plug sleeve 3-3 is provided with a positioning groove 5, and the outer wall of the plug tube 3-2 is provided with a positioning slide 6, which is embedded in the interior of the positioning groove 5.

[0046] In some examples, the feed hood 3-1 is embedded inside the feed tank 2, and the insertion tube 3-2 at its lower end is precisely inserted into the insertion sleeve 3-3 inside the feed tank 2. To ensure that the insertion tube 3-2 slides smoothly inside the insertion sleeve 3-3, the positioning slide strip 6 on the outer side wall of the insertion tube 3-2 needs to cooperate well with the positioning slide groove 5 on the inner side wall of the insertion sleeve 3-3.

[0047] For example, such as Figure 2 As shown, the rotary motor 4-3 is fitted with a motor sleeve 7, and the motor sleeve 7 is fixedly connected to the fixing frame 4-2.

[0048] In some examples, the mounting bracket 4-2 is installed on the side wall of the connecting pipe 4-1, the rotary motor 4-3 is installed inside the mounting bracket 4-2, and the motor sleeve 7 fitted on the outside of it can protect the motor.

[0049] For example, such as Figure 2 As shown, there are two feed chambers 4-5, which are located at opposite ends of the feed sphere 4-4.

[0050] In some examples, the size of the feed chamber 4-5 should be designed reasonably according to the characteristics of the material and the required feed amount. For materials with good flowability, the size of the feed chamber 4-5 can be appropriately smaller; for materials with poor flowability, the size of the feed chamber 4-5 needs to be appropriately increased.

[0051] For example, such as Figure 1 As shown, the side wall of the processing tank 1 is provided with an auxiliary supply tank 8, and the feeding ratio between the auxiliary supply tank 8 and the feed tank 2 is 1:9.

[0052] In some examples, the rotary motor 4-3 is turned on, the feed ball 4-4 starts to rotate, and the feed chamber 4-5, along with the rotation of the feed ball 4-4, quantitatively transports the material from the feed tank 2 to the processing tank 1.

[0053] For example, such as Figure 2 As shown, the connecting pipe 4-1 and the insertion pipe 3-2 are sealed together, and the diameters of the connecting pipe 4-1 and the insertion pipe 3-2 are matched.

[0054] In some examples, the connecting pipe 4-1 is to be securely mounted on the upper end face of the processing tank 1 and to be sealed and plugged into the lower end of the feed tank 2, while ensuring that the diameters of the two are matched to prevent material leakage.

[0055] In use, this gradient feeding device for packaging powdered materials operates on the principle of two-stage feeding control and mechanical coordinated motion. It achieves efficient and stable material supply through a combination of oscillating dispersion and fixed-frequency conveying. The following is a detailed explanation of its core working principle:

[0056] The vibrating motor 3-7 drives the driving cam 3-5 to rotate. The periodic change in the cam profile pushes the force-receiving platform 3-4, causing the feed hood 3-1 to reciprocate up and down under the constraint of the positioning slide bar 6 and the positioning groove 5. The vibration frequency is determined by the motor speed, usually 20-50Hz (which can be adjusted according to the material characteristics). The vibration force reduces the internal friction of the powdery material, breaks up agglomerates, and improves flowability. It drives the wheel 3-9 to roll along the inner wall of the feed tank 2, ensuring the stability of the vibration and preventing material from accumulating at the edges. The up and down movement of the feed hood 3-1... This creates a "piston pump" effect, accelerating the flow of material towards the insertion pipe 3-2 while avoiding the "bridging" phenomenon (material forming an arched blockage at the funnel opening) that may occur during traditional gravity feeding. The rotary motor 4-3 drives the feeding sphere 4-4 to rotate at a constant speed. The two symmetrical feeding chambers 4-5 on the sphere are alternately connected to the insertion pipe 3-2 and the connecting pipe 4-1. When the feeding chamber 4-5 is aligned with the insertion pipe 3-2, the material is filled into the chamber under gravity and oscillation pressure. The feeding chamber 4-5 rotates to the connecting pipe 4-1, and the material falls into the processing tank 1 due to gravity.

[0057] Single feed volume = 4-5 times the volume of the feed chamber × filling coefficient (usually 0.8-0.9).

[0058] Feeding frequency = motor speed × number of feeding chambers 4-5 (2 chambers correspond to 2 feedings per revolution).

[0059] Precise flow control of 10-50 kg / min can be achieved by adjusting the motor speed (e.g., 10-30 rpm).

[0060] The protective sleeve protects the rotary motor 4-3 from dust, ensuring long-term stable operation. The sealed connection between the connecting pipe 4-1 and the insertion pipe 3-2 (usually using an O-ring seal) prevents material leakage and improves quantitative accuracy. The main feed (through the feed tank 2) accounts for 90% and provides the basic flow rate. The auxiliary supply tank 8 accounts for 10% and is used to add additives or trace elements to achieve precise formula control. The output of the oscillating feed component 3 and the intake of the fixed-frequency feed component 4 form a dynamic balance: the higher the oscillation frequency, the better the material flow and the higher the filling efficiency of the fixed-frequency component. The auxiliary supply tank 8 is controlled by an independent valve and mixes with the main feed in the processing tank 1 to ensure uniform composition. The oscillating motor 3-7 starts first and pre-disperses the material for 30 seconds to ensure unobstructed feeding channels. The rotary motor 4-3 starts synchronously and sets the initial speed (e.g., 15 rpm). After being oscillated and dispersed, the material falls into the feed chamber 4-5. The ball completes one feeding cycle every 180° rotation. The auxiliary supply tank 8 injects additives synchronously according to the set ratio (e.g., 10%).

[0061] First, stop the rotary motor 4-3. After the material in the feeding chamber 4-5 is emptied, turn off the vibrating motor 3-7 to prevent residual material from clumping. The vibration and dispersion effectively avoids clogging of highly viscous materials, and is especially suitable for materials that are prone to clumping, such as starch and milk powder.

[0062] High-precision control: Fixed-frequency feeding error ≤ ±1%, far exceeding the traditional gravity feeding device (error ±3%-5%).

[0063] Formulation flexibility: The gradient feed design supports precise proportioning of multi-component materials to adapt to different packaging needs.

[0064] Easy maintenance: The modular design allows for quick replacement of vulnerable parts such as the feed hood 3-1 and the feed ball 4-4, reducing downtime.

[0065] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A gradient feeding device for packaging powdered materials, characterized in that, include: A processing tank (1), wherein a feeding tank (2) is provided at the upper end of the processing tank (1); An oscillating feed assembly (3) is disposed inside the feed tank (2); A fixed-frequency feeding assembly (4) is disposed between the feeding tank (2) and the processing tank (1); The oscillating feeding assembly (3) includes a feeding hood (3-1), which is embedded inside the processing tank (1). A connector (3-2) is provided at the lower end of the feeding hood (3-1). A connecting sleeve (3-3) is provided inside the feeding tank (2), and the connector (3-2) is inserted into the connecting sleeve (3-3). A force-bearing platform (3-4) is provided at the lower end of the outer wall of the feeding hood (3-1). A drive cam (3-5) is provided at the lower end of the feed tank (2). The drive cam (3-5) is in contact with the force-bearing platform (3-4). A mounting frame (3-6) is provided on the side wall of the feed tank (2). An oscillating motor (3-7) is provided on the mounting frame (3-6). The output end of the oscillating motor (3-7) is inserted into the interior of the feed tank (2). The output end of the oscillating motor (3-7) is fixedly connected to the drive cam (3-5).

2. The gradient feeding device for packaging powdered materials according to claim 1, characterized in that, The side wall of the feed hood (3-1) is provided with a connecting frame (3-8), and the inner side wall of the connecting frame (3-8) is provided with a drive wheel (3-9), which is in contact with the inner side wall of the feed tank (2).

3. The gradient feeding device for packaging powdered materials according to claim 1, characterized in that, The fixed-frequency feeding assembly (4) includes a connecting pipe (4-1), which is disposed on the upper end face of the processing tank (1). The lower end of the feeding tank (2) is fixedly connected to the connecting pipe (4-1). A fixing frame (4-2) is provided on the side wall of the connecting pipe (4-1). A rotary motor (4-3) is disposed inside the fixing frame (4-2). The output end of the rotary motor (4-3) is inserted into the interior of the connecting pipe (4-1). A feeding ball (4-4) is fitted onto the output end of the rotary motor (4-3). A feeding cavity (4-5) is opened on the side wall of the feeding ball (4-4).

4. The gradient feeding device for packaging powdered materials according to claim 1, characterized in that, The inner wall of the plug sleeve (3-3) is provided with a positioning groove (5), and the outer wall of the plug tube (3-2) is provided with a positioning strip (6), which is embedded in the interior of the positioning groove (5).

5. A gradient feeding device for packaging powdered materials according to claim 3, characterized in that, The rotary motor (4-3) is fitted with a motor sleeve (7), and the motor sleeve (7) is fixedly connected to the fixing frame (4-2).

6. A gradient feeding device for packaging powdered materials according to claim 3, characterized in that, There are two feeding chambers (4-5), which are located at opposite ends of the feeding sphere (4-4).

7. A gradient feeding device for packaging powdered materials according to claim 1, characterized in that, The processing tank (1) is provided with an auxiliary supply tank (8) on its side wall, and the feeding ratio between the auxiliary supply tank (8) and the feeding tank (2) is 1:

9.

8. A gradient feeding device for packaging powdered materials according to claim 3, characterized in that, The connecting tube (4-1) and the insertion tube (3-2) are sealed together, and the diameters of the connecting tube (4-1) and the insertion tube (3-2) are matched.

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