A smart glue and oil dispensing machine

Abstract

This invention relates to the field of dispensing machines, and more particularly to an intelligent dispensing machine. The invention provides such an intelligent dispensing machine, including a mounting frame and an integrated feeding unit. The integrated feeding unit is connected to a material cylinder, a telescopic guide tube, a telescopic needle tube, and multiple L-shaped side needle tubes. By adjusting the height of the telescopic guide tube and simultaneously adjusting the lateral distance between the L-shaped side needle tubes and the telescopic guide tube, the spacing of the multiple L-shaped side needle tubes can be automatically and quickly adjusted according to the dispensing position of the product. This ensures that the material ejected from the L-shaped side needle tubes flows through a constant distance, guaranteeing continuous and stable dispensing operations. The diameter of the telescopic needle tube is larger than the diameter of the L-shaped side needle tubes. By switching the working modes of the telescopic needle tube and the L-shaped side needle tubes, the dispensing specifications can be changed. This invention solves the technical problems of traditional dispensing machines being large in size, complex in function, and cumbersome in manually changing parts, which affects the efficiency of dispensing operations.

Description

Technical Field

[0001] This invention relates to the field of dispensing machines, and more particularly to an intelligent dispensing machine. Background Technology

[0002] With the increasing production efficiency and space utilization becoming a trend, traditional dispensing machines are large in size and occupy a lot of space. They also have many accessories and are complex to use. In particular, when multi-position dispensing and multi-specification dispensing and coating work is required, it is necessary to manually change different numbers of dispensing tubes and dispensing tubes of different diameters. The operation steps are cumbersome and affect the processing efficiency of dispensing and coating work.

[0003] Therefore, the present invention provides an intelligent dispensing machine that can automatically and quickly switch between various dispensing modes according to the required adhesive or oil body (hereinafter collectively referred to as material body) during the dispensing process to cope with different dispensing or oiling operations required by the product. It easily achieves the effects of fewer accessories, lower maintenance costs, and less space occupation, thereby improving production efficiency and competitiveness in the industry. Summary of the Invention

[0004] To overcome the shortcomings of traditional dispensing machines, such as large size, complex functions, cumbersome manual replacement of parts, and reduced efficiency in dispensing and oiling processes, this invention provides an intelligent dispensing machine.

[0005] Technical Solution: An intelligent dispensing machine includes a mounting frame, an integrated feeding unit, a material cylinder, a telescopic guide tube, an adjusting unit, a telescopic needle tube, an L-shaped side needle tube, and a longitudinally moving carrier mechanism. A lifting mechanism is mounted on the mounting frame. A transverse guide rail is connected to the lifting mechanism. A transverse slider is slidably connected to the transverse guide rail. The integrated feeding unit is connected to the transverse slider. The integrated feeding unit is connected to the material cylinder. A telescopic guide tube is slidably connected to the lower end of the material cylinder, and the material cylinder connects to the telescopic guide tube. The telescopic guide tube has at least two branch pipes. L-shaped side needle tubes are slidably connected to the branch pipes. A control mechanism for the height of the telescopic guide tube and a control mechanism for the L-shaped side needle tube are connected to the material cylinder. The device includes: a needle tube distance adjustment unit; a telescopic needle tube slidably connected inside the telescopic guide tube; a second electric push rod connected to the telescopic guide tube to control the height of the telescopic needle tube; a feed hole at the upper end of the telescopic needle tube connecting to the telescopic guide tube; a spray hole structure at the lower end of the telescopic needle tube; a distribution groove structure with at least two feed holes connecting to the telescopic needle tube; a distribution groove connected to a corresponding branch pipe; at least two C-shaped guide grooves at the lower end of the telescopic guide tube; a conical trough structure connecting to the spray hole on the telescopic needle tube; and at least two through groove structures connecting to the corresponding C-shaped guide grooves on the telescopic needle tube; and a longitudinally moving carrier mechanism mounted on the mounting frame.

[0006] Furthermore, the integrated material conveying unit includes a pressure air source regulation and control mechanism, an intelligent solenoid valve controller, and a storage tank; the pressure air source regulation and control mechanism is installed on the transverse slider; the pressure air source regulation and control mechanism is equipped with an intelligent solenoid valve controller; the pressure air source regulation and control mechanism is equipped with a storage tank; and the intelligent solenoid valve controller is connected to the material cylinder pipe.

[0007] Furthermore, the adjustment unit includes a first electric push rod, a fixed frame, a bidirectional lead screw, a micro motor, and traction blocks; the first electric push rod is fixedly connected to the barrel tube; the telescopic end of the first electric push rod is fixedly connected to the fixed frame; the telescopic guide tube is fixedly connected to the fixed frame; the bidirectional lead screw is rotatably connected to the fixed frame; the micro motor that drives the bidirectional lead screw is fixedly connected to the fixed frame; a traction block is screwed to each end of the bidirectional lead screw; and an L-shaped side needle tube is fixedly connected to each of the two traction blocks.

[0008] Furthermore, the conical trough is configured as a downward-contracting bucket-shaped structure.

[0009] Furthermore, the conical trough has a downward-contracting conical protrusion structure in the middle, which, together with the conical trough, forms an annular contracting trough structure.

[0010] Furthermore, an electronic heating sleeve is fitted onto the outer surface of the telescopic conduit.

[0011] Furthermore, a collection cylinder is installed on the longitudinally moving tray mechanism.

[0012] Furthermore, the collection cylinder has a central channel in the middle that connects to the bottom space; and side channels around the collection cylinder that connect to the bottom space.

[0013] Furthermore, a filter element is provided on the upper side of the side channel.

[0014] Furthermore, the diameter of the telescopic needle tube is larger than the diameter of the two L-shaped side needle tubes, and the initial height of the lower end of the telescopic needle tube is higher than the initial height of the lower end of the two L-shaped side needle tubes.

[0015] Beneficial effects: The integrated feeding unit of the intelligent dispensing machine of the present invention is connected to a material cylinder tube, a telescopic guide tube, a telescopic needle tube, and multiple L-shaped side needle tubes. The vertical height of the telescopic guide tube is controlled by an adjustment unit, and the lateral distance between the L-shaped side needle tubes and the telescopic guide tube is controlled by the adjustment unit. This enables the multiple L-shaped side needle tubes to automatically and quickly adjust their spacing according to the dispensing position of the product, and ensures that the material sprayed from the L-shaped side needle tubes has a constant flow path. This ensures that the material sprayed from the L-shaped side needle tubes has consistent structural integrity and the same intermittent drop time, ensuring the continuous and stable dispensing operation. Furthermore, the diameter of the telescopic needle tube is larger than that of the L-shaped side needle tube. By switching the working modes of the telescopic needle tube and the L-shaped side needle tube, the specifications of dispensing can be changed. This invention solves the technical problems of traditional dispensing machines being large in size, complex in function, and cumbersome in manually changing parts, which affect the efficiency of dispensing and oiling processes. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram illustrating the present invention according to an embodiment; Figure 2 This is a schematic diagram illustrating the three-dimensional structure of the barrel tube according to an embodiment of the present invention; Figure 3 This is a three-dimensional structural diagram illustrating the material barrel and telescopic guide tube of the present invention according to an embodiment; Figure 4 This is a three-dimensional structural diagram illustrating the adjustment unit of the present invention according to an embodiment; Figure 5 A cross-sectional view of the telescopic conduit of the present invention is provided according to an embodiment. Figure 6 The following is a cross-sectional view illustrating the telescopic catheter and telescopic needle of the present invention according to embodiments; Figure 7 This is a schematic diagram illustrating the three-dimensional structure of the collection tube according to an embodiment of the present invention; Figure 8 This is a cross-sectional view of the collection tube according to an embodiment of the present invention.

[0017] Component names and serial numbers in the diagram: 1-Mounting bracket, 11-Lifting mechanism, 12-Transverse guide rail, 13-Transverse slider, 21-Pressure air source regulation and control mechanism, 22-Intelligent solenoid valve controller, 23-Storage tank, 3-Material cylinder tube, 4-Telescopic guide tube, 401-Branch pipe, 402-C-shaped guide channel, 41-First electric push rod, 42-Fixed bracket, 43-Two-way lead screw, 44-Micro motor, 45-Traction block, 5-Telescopic needle tube, 50-Conical protrusion, 501-Infeed hole, 502-Spraying hole, 503-Distribution trough, 504-Conical hopper trough, 505-Through groove, 51-Second electric push rod, 6-L-shaped side needle tube, 7-Longitudinal moving carrier plate mechanism, 8-Electronic heating jacket, 9-Collection cylinder, 901-Central channel, 902-Side channel, 91-Filter element. Detailed Implementation

[0018] The preferred technical solution of the present invention will be described in detail below with reference to the accompanying drawings.

[0019] Example 1: An intelligent dispensing machine, such as Figures 1-6As shown, the device includes a mounting frame 1, an integrated feeding unit, a material cylinder tube 3, a telescopic guide tube 4, an adjustment unit, a telescopic needle tube 5, an L-shaped side needle tube 6, and a longitudinally moving carrier plate mechanism 7. A lifting mechanism 11 is mounted on the mounting frame 1. A transverse guide rail 12 is connected to the lifting mechanism 11. A transverse slider 13 is slidably connected to the middle of the transverse guide rail 12. An integrated feeding unit is connected to the transverse slider 13. The integrated feeding unit is connected to the material cylinder tube 3. A telescopic guide tube 4 is slidably connected to the lower end of the material cylinder tube 3, and the material cylinder tube 3 communicates with the telescopic guide tube 4. A branch pipe 401 is provided on the left and right sides of the telescopic guide tube 4. An L-shaped side needle tube 6 is slidably connected to each of the two branch pipes 401. An adjustment unit is connected to the material cylinder tube 3, controlling the vertical height of the telescopic guide tube 4 and simultaneously controlling the lateral distance between the L-shaped side needle tube 6 and the telescopic guide tube 4. A telescopic needle tube 5 is slidably connected inside the telescopic guide tube 4. The initial height of the lower end of the telescopic needle tube 5 is higher than that of the two side needle tubes 6. The initial height of the lower end of the L-shaped side needle tube 6 ensures that the telescopic needle tube 5 will not interfere with the dispensing operation of the L-shaped side needle tube 6 during dispensing. A second electric push rod 51 is connected to the telescopic guide tube 4, which controls the vertical height of the telescopic needle tube 5. The upper end of the telescopic needle tube 5 has a feed hole 501 that connects to the telescopic guide tube 4. The lower end of the telescopic needle tube 5 has a spray hole 502. A nozzle is located on both the left and right sides of the telescopic needle tube 5. The feed inlet 501 is connected to the feed channel 503 structure; the two feed channels 503 are respectively connected to the corresponding branch pipes 401; a C-shaped guide channel 402 is opened on the lower left and lower right sides of the telescopic guide tube 4; a conical hopper 504 structure is opened in the middle of the telescopic needle tube 5 to connect to the spray hole 502; a through groove 505 structure is opened on the left and lower right sides of the telescopic needle tube 5 to connect to the corresponding C-shaped guide channel 402; a longitudinal moving tray mechanism 7 is installed on the mounting frame 1.

[0020] like Figure 1 and Figure 2 As shown, the integrated material conveying unit includes a pressure air source regulating and control mechanism 21, an intelligent solenoid valve controller 22, and a storage tank 23. The pressure air source regulating and control mechanism 21 is installed on the horizontal slider 13. The intelligent solenoid valve controller 22 is connected to the front of the pressure air source regulating and control mechanism 21. The storage tank 23 is connected to the left side of the pressure air source regulating and control mechanism 21. The intelligent solenoid valve controller 22 is connected to the material cylinder tube 3. The storage tank 23 is connected to the material cylinder tube 3 through a pipeline. The pressure air source regulating and control mechanism 21 delivers pressure air into the storage tank 23 and the material cylinder tube 3 through pipelines. Under the control of the intelligent solenoid valve controller 22, when the intelligent solenoid valve controller 22 initiates a feeding action, the pressure air source regulating and control mechanism 21 simultaneously inputs pressure air into the storage tank 23 and injects it into the material cylinder tube 3, allowing the material in the storage tank 23 to be sprayed out from the telescopic needle tube 5 or the L-shaped side needle tube 6 of the material cylinder tube 3 and applied to the product. This makes the overall structure of the integrated material conveying unit simple, easy to maintain, and improves work efficiency.

[0021] like Figure 3 and Figure 4 As shown, the adjustment unit includes a first electric push rod 41, a fixed frame 42, a bidirectional lead screw 43, a micro motor 44, and a traction block 45; the first electric push rod 41 is bolted to the barrel 3; the telescopic end of the first electric push rod 41 is fixedly connected to the fixed frame 42; the telescopic guide tube 4 is fixedly connected to the fixed frame 42; the bidirectional lead screw 43 is rotatably connected to the fixed frame 42; the micro motor 44 is bolted to the fixed frame 42; the output shaft of the micro motor 44 is fixedly connected to the bidirectional lead screw 43; each end of the bidirectional lead screw 43 is screwed with a traction block 45; each of the two traction blocks 45 is fixedly connected to an L-shaped side needle tube 6.

[0022] like Figure 6 As shown, the conical trough 504 is configured as a downward-contracting bucket-shaped structure; the middle part of the conical trough 504 is provided with a downward-contracting conical protrusion 50 structure. The conical protrusion 50 and the conical trough 504 form an annular contraction bucket structure, which forces the material flowing through the annular contraction bucket structure to be squeezed and contracted into a tight whole, avoiding the presence of a large amount of air inside the material after it is distributed and then gathered, and reducing the impact on the integrity of the material after distribution.

[0023] This intelligent dispensing and oiling machine has multiple dispensing modes: In the initial state, the two L-shaped side needle tubes 6 are connected to the feed hole 501 and the telescopic guide tube 4 through the branch pipe 401 and the material distribution groove 503, respectively.

[0024] First, the product to be dispensed is placed on the longitudinal moving tray mechanism 7. The lifting mechanism 11 controls the transverse guide rail 12 and its connected transverse slider 13 and pressure air source adjustment control mechanism 21, which drive the material cylinder tube 3 on the intelligent solenoid valve controller 22 to move up and down. At the same time, the transverse slider 13 drives the pressure air source adjustment control mechanism 21 and its connected intelligent solenoid valve controller 22 and material cylinder tube 3 to move left and right along the transverse guide rail 12. The longitudinal moving tray mechanism 7 drives the product to move back and forth, so that the two L-shaped side needle tubes 6 are close to the area of ​​the product to be dispensed. At the same time, under the control of the pressure air source adjustment control mechanism 21, the pressure air source in the input material cylinder tube 3 is controlled to spray the material in the input material cylinder tube 3 into the telescopic guide tube 4. Then the material flows through the feed hole 501, the distribution groove 503 and the branch pipe 401, and then falls down from the L-shaped side needle tubes 6 onto the product. This realizes that multiple L-shaped side needle tubes 6 can simultaneously complete the multi-point dispensing of the product, improving the dispensing efficiency of the product.

[0025] When it is necessary to change the spacing between the L-shaped side needle tubes 6 according to the position of the area to be dispensed on the product, the output shaft of the micro motor 44 drives the bidirectional lead screw 43 to rotate. The bidirectional lead screw 43 simultaneously drives the two L-shaped side needle tubes 6 to move closer or further apart through the two traction blocks 45, thereby adjusting the spacing between the two L-shaped side needle tubes 6. At the same time, the telescopic end of the first electric push rod 41 pushes the fixing frame 42 to drive the telescopic guide tube 4 to be released downward or retracted upward along the material cylinder tube 3, so that the stroke of the material flowing through the material cylinder tube 3, the telescopic guide tube 4 and the L-shaped side needle tubes 6 remains unchanged. This ensures that the pressure air source adjustment and control mechanism 21, under the same pressure air source outputting the same pressure to the material cylinder tube 3, ensures that the material sprayed from the L-shaped side needle tubes 6 has consistent structural integrity and the same intermittent drop time, thereby ensuring the continuous and stable operation of the dispensing work.

[0026] This intelligent dispensing machine's single-dispensing mode: When there is only one dispensing area on the product, it is necessary to switch the dispensing mode of this intelligent dispensing machine. The telescopic end of the second electric push rod 51 pushes the telescopic needle tube 5 downward, so that the dispensing groove 503 of the telescopic needle tube 5 is disconnected from the branch pipe 401, and the dispensing groove 503 of the telescopic needle tube 5 is connected to the upper port of the C-shaped guide groove 402. At this time, the through groove 505 of the telescopic needle tube 5 is connected to the lower port of the C-shaped guide groove 402. At this time, the upper end of the telescopic guide tube 4 is connected to the feed hole 501, the dispensing groove 503, the C-shaped guide groove 402, the through groove 505 and the conical hopper groove 504. After moving downward, the lower end of the telescopic needle tube 5 is lower than the lower end of the L-shaped side needle tube 6, so the L-shaped side needle tube 6 will not interfere with the dispensing operation of the telescopic needle tube 5.

[0027] When performing glue and oil dispensing on the product, first follow the above steps. Through the multi-axis control of the lifting mechanism 11, the horizontal slider 13, and the longitudinal moving carrier mechanism 7, align the spray nozzle 502 of the telescopic needle tube 5 with the dispensing area of ​​the product. Then, under the control of the pressure air source adjustment and control mechanism 21, the pressure air source input into the material tube 3 sprays the material into the telescopic guide tube 4. The material flows through the feed hole 501, the distribution groove 503, the C-shaped guide groove 402, the through groove 505, and the conical hopper 504. The material is forced to compress and shrink into a tight whole in the conical hopper 504, and then sprayed downwards onto the dispensing area of ​​the product through the spray nozzle 502, completing the single-point dispensing process of the product.

[0028] In addition, when the diameter of the telescopic needle tube 5 is larger than the diameter of the two L-shaped side needle tubes 6, the pressure air source adjustment and control mechanism 21 can spray materials of different specifications downward from the telescopic needle tube 5 under the pressure air source that outputs the same pressure to the barrel tube 3. By switching the working mode of the telescopic needle tube 5 and the L-shaped side needle tube 6, the specifications of oil and glue dispensing can be changed.

[0029] Example 2: Based on Example 1, as follows Figures 1-6 As shown, the outer surface of the telescopic conduit 4 in this embodiment is fitted with an electronic heating sleeve 8. The electronic heating sleeve 8 heats and melts the waste material remaining in the C-shaped guide groove 402, so that the telescopic conduit 4 and the telescopic needle tube 5 have anti-clogging and self-cleaning functions.

[0030] The anti-clogging and self-cleaning function of this intelligent dispensing machine: As the dispensing and oiling of the product continues, since the material distribution trough 503, the C-shaped guide trough 402 and the conical hopper trough 504 are continuous curved paths, material is easily left in the C-shaped guide trough 402. In order to prevent the material left in the C-shaped guide trough 402 from causing blockage, it is necessary to carry out anti-blockage self-cleaning work on the C-shaped guide trough 402.

[0031] First, switch the intelligent dispensing machine to single-dispensing mode, connecting the upper end of the telescopic guide tube 4 to the feed hole 501, the distribution groove 503, the C-shaped guide groove 402, the through groove 505, and the conical hopper groove 504. Then, the electronic heating jacket 8 heats the C-shaped guide groove 402 to melt the residual waste in the C-shaped guide groove 402. Under the control of the pressure air source regulating and control mechanism 21, the pressure air source input into the material cylinder tube 3 flows separately through the telescopic guide tube 4, the feed hole 501, the distribution groove 503, the C-shaped guide groove 402, the through groove 505, and the conical hopper groove 504, so that the pressure air source flowing separately through the C-shaped guide groove 402 sprays the residual waste in the C-shaped guide groove 402 downwards, completing the anti-clogging and self-cleaning work of the intelligent dispensing machine.

[0032] Example 3: Based on Example 2, such as Figures 1-8 As shown, a collection cylinder 9 is installed on the longitudinally moving tray mechanism 7 of this embodiment. The telescopic needle tube 5 is inserted into the collection cylinder 9 to perform anti-clogging and self-cleaning work. A central channel 901 connecting to the bottom space is provided in the middle of the collection cylinder 9. Side channels 902 connecting to the bottom space are provided around the collection cylinder 9. The telescopic needle tube 5 is inserted into the collection cylinder 9 through the central channel 901. The waste material sprayed downward from the telescopic needle tube 5 with the pressure air source will enter the side channels 902 through the bottom space of the collection cylinder 9. A filter element 91 is fixedly connected to the upper side of all side channels 902. The filter element 91 filters and intercepts the waste material rushing upward from the side channels 902 to prevent the upward-rushing waste material from splashing around.

[0033] Although the invention has been described with reference to exemplary embodiments, it should be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims should be given the broadest interpretation so as to cover all variations and equivalent structures and functions.

Claims

1. An intelligent dispensing machine, comprising: a mounting bracket (1); A lifting mechanism (11) is installed on the mounting bracket (1); a horizontal guide rail (12) is connected to the lifting mechanism (11); a horizontal slider (13) is slidably connected to the horizontal guide rail (12). Its characteristics are: It also includes an integrated feeding unit; the integrated feeding unit is connected to the transverse slider (13); the integrated feeding unit is connected to the material cylinder tube (3); the lower end of the material cylinder tube (3) is slidably connected to the telescopic guide tube (4), and the material cylinder tube (3) is connected to the telescopic guide tube (4); the telescopic guide tube (4) is provided with no less than two branch tubes (401); the branch tubes (401) are slidably connected to the L-shaped side needle tubes (6); the material cylinder tube (3) is connected to an adjustment unit for controlling the height of the telescopic guide tube (4) and the distance of the L-shaped side needle tubes (6); the telescopic needle tube (5) is slidably connected inside the telescopic guide tube (4); the telescopic guide tube (4) is connected to a second electric push rod (51) for controlling the height of the telescopic needle tube (5); the telescopic needle tube (5) The upper end of the telescopic needle tube (5) is provided with a feed hole (501) that connects to the telescopic conduit (4); the lower end of the telescopic needle tube (5) is provided with a spray hole (502); the telescopic needle tube (5) is provided with a distribution groove (503) structure that connects to the feed hole (501); the distribution groove (503) is connected to the corresponding branch pipe (401); the lower end of the telescopic conduit (4) is provided with a C-shaped guide groove (402); the telescopic needle tube (5) is provided with a conical hopper groove (504) structure that connects to the spray hole (502); the telescopic needle tube (5) is provided with a through groove (505) structure that connects to the corresponding C-shaped guide groove (402); a longitudinal moving tray mechanism (7) is installed on the mounting frame (1).

2. The intelligent dispensing machine according to claim 1, characterized in that: The integrated material conveying unit includes a pressure air source regulating and control mechanism (21); the pressure air source regulating and control mechanism (21) is installed on the transverse slider (13); the pressure air source regulating and control mechanism (21) is equipped with an intelligent solenoid valve controller (22); the pressure air source regulating and control mechanism (21) is equipped with a storage tank (23); the intelligent solenoid valve controller (22) is connected to the material cylinder pipe (3).

3. The intelligent dispensing machine according to claim 1, characterized in that: The adjustment unit includes a first electric push rod (41); the first electric push rod (41) is fixedly connected to the barrel (3); a fixed frame (42) is fixedly connected to the telescopic end of the first electric push rod (41); the telescopic guide tube (4) is fixedly connected to the fixed frame (42); a bidirectional lead screw (43) is rotatably connected to the fixed frame (42); a micro motor (44) for driving the bidirectional lead screw (43) is fixedly connected to the fixed frame (42); a traction block (45) is screwed to each end of the bidirectional lead screw (43); and an L-shaped side needle tube (6) is fixedly connected to each of the two traction blocks (45).

4. The intelligent dispensing machine according to claim 1, characterized in that: The conical trough (504) is configured as a downward-contracting bucket-shaped structure.

5. An intelligent dispensing machine according to claim 4, characterized in that: The conical trough (504) has a downward-contracting conical protrusion (50) structure in the middle, and the conical protrusion (50) and the conical trough (504) form an annular contraction trough structure.

6. An intelligent dispensing machine according to claim 1, characterized in that: An electronic heating sleeve (8) is fitted on the outer surface of the telescopic conduit (4).

7. An intelligent dispensing machine according to claim 1, characterized in that: A collection tube (9) is installed on the longitudinal moving tray mechanism (7).

8. An intelligent dispensing machine according to claim 7, characterized in that: The collection tube (9) has a central channel (901) in the middle that connects to the bottom space; and side channels (902) connecting to the bottom space are provided around the collection tube (9).

9. An intelligent dispensing machine according to claim 8, characterized in that: A filter element (91) is provided on the upper side of the side channel (902).

10. An intelligent dispensing machine according to any one of claims 1-9, characterized in that: The diameter of the telescopic needle tube (5) is larger than the diameter of the two L-shaped side needle tubes (6), and the initial height of the lower end of the telescopic needle tube (5) is higher than the initial height of the lower end of the two L-shaped side needle tubes (6).

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