A filling mechanism of a desktop dispensing machine

Abstract

The application discloses a filling mechanism of a desktop sub-packaging machine and relates to the technical field of desktop sub-packaging machines.The technical scheme is characterized in that the filling mechanism comprises a machine table, a fixing frame is arranged on the machine table, a syringe and a driving assembly are arranged on the fixing frame, a drying part, a liquid injection part, a first valve group for jointly controlling the opening and closing of the drying part and the liquid injection part, and a second valve group for independently controlling the liquid injection part are arranged on the syringe, and the syringe comprises the following working states: when the syringe moves downward, the drying part works; when the syringe moves back, the liquid injection part and the drying part work simultaneously; and when the syringe moves back to the original position, the drying part and the liquid injection part stop working.The mechanism integrates the drying mechanism and the conventional filling mechanism, can realize the synchronous and coherent operation of drying and filling simultaneously, and can form an air flow blocking layer on the upper part of the liquid filled into the bottle during the filling process, so that the liquid cannot be splashed upward, and the problem that the liquid pollutes the environment during the filling process of blood products is avoided.

Description

Technical Field

[0001] This invention relates to the field of desktop filling machine technology, and more specifically to a filling mechanism for a desktop filling machine. Background Technology

[0002] A desktop filling machine is a small, automated or semi-automated mechanical device used to accurately measure and dispense various types of materials, such as liquids, powders, and granules, into different containers, such as bottles, bags, small boxes, or other packaging materials. The filling machine is typically equipped with a filling mechanism for filling the liquid into the bottle for sealing. Before the filling process, the packaging bottle needs to be cleaned with water to prevent adverse effects on the medicine being filled into the bottle.

[0003] Blood products are typically sterile, requiring the preparation of liquids and powders to be filled into different containers for encapsulation. During the filling process, to prevent the blood products from being diluted by residual water droplets from the bottle cleaning process, an independent drying mechanism needs to be installed before the filling unit. This results in less than optimal overall machine processing efficiency. Furthermore, the impact force of the liquid into the bottle during filling causes some liquid droplets to splash, which will cause plasma proteins to adhere to the injection tube. Additionally, some liquid droplets will fly out from the bottle opening. Since blood products are biological protein preparations, they are more prone to bacterial growth, which can lead to contamination of the processing environment and equipment, affecting the filling qualification rate of subsequent products.

[0004] In view of this, a design or technical improvement is proposed to solve the above problems.

[0005] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is the closest prior art. Summary of the Invention

[0006] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a filling mechanism for a desktop dispensing machine.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] A filling mechanism for a desktop dispensing machine includes a machine base, a fixed frame on the machine base, an injection tube for filling and a drive assembly for driving the injection tube to move up and down reciprocally; the injection tube is provided with a drying section for spraying air into the filling bottle, a liquid injection section for injecting liquid into the bottle, a first valve group that jointly controls the opening and closing of the drying section and the liquid injection section, and a second valve group that independently controls the liquid injection section.

[0009] The injection tube includes the following operating states:

[0010] When the injection tube moves downwards, the first valve group opens and the second valve group closes, and the drying section starts working.

[0011] When the injection tube moves to the bottom and then back, the second valve group opens, and the injection section and the drying section work simultaneously.

[0012] When the injection tube is moved back to its original position, the first valve group opens and the second valve group closes, and the drying section and the injection section stop working.

[0013] Furthermore, the injection unit includes an injection chamber located inside the injection tube and open at the bottom, and an infusion hose with one end connected to the injection chamber and the other end connected to the machine.

[0014] Furthermore, the drying section includes a jet chamber disposed between the injection chamber and the injection tube and isolated from the injection chamber, a gas delivery hose with one end connected to the jet chamber and the other end connected to the machine, and a jet nozzle disposed at the bottom end of the injection tube and connected to the jet chamber; the jet nozzle is provided with jet openings evenly distributed towards the side end.

[0015] Furthermore, the drive assembly includes a drive section and a connecting section for connecting the drive section and the injection tube.

[0016] Furthermore, the drive unit includes a drive motor mounted on a fixed frame, a reciprocating threaded screw rotatably mounted on the fixed frame via a bearing bracket and connected to the drive motor, and a screw sleeve that reciprocates up and down on the reciprocating threaded screw; limit sliders are provided on both sides of the screw sleeve, and a limit groove is provided on the fixed frame to match the limit sliders.

[0017] Furthermore, the connecting part includes a connecting arm with one end mounted on the lead screw sleeve and the other end slidably sleeved with the injection tube, a linkage rod mounted at the lower end of the connecting arm, and a pusher ring connected to the end of the linkage rod away from the connecting arm and slidably sleeved with the injection tube; a fixing ring plate is provided on the injection tube near the nozzle, the pusher ring is located between the fixing ring plate and the nozzle, and the linkage rod slides through the fixing ring plate; a friction arm is provided on the fixing frame to clamp and abut against both sides of the outer surface of the injection tube, and the friction force between the friction arm and the injection tube is greater than the friction force between the pusher ring and the injection tube.

[0018] Furthermore, the first valve assembly includes a liquid valve for controlling the injection section and an air valve for controlling the drying section; the liquid valve includes an intermediate liquid chamber disposed between and communicating with the injection chamber and the infusion hose, a first partition plate disposed within the intermediate liquid chamber and having a first through hole at its upper end, a first limiting rod slidably connected to the upper side wall of the intermediate liquid chamber, and a first sealing plate disposed at the lower end of the first limiting rod and capable of blocking the first through hole; the air valve includes an intermediate air chamber disposed between and communicating with the air jet chamber and the air infusion hose, a second partition plate disposed within the intermediate air chamber and having a second through hole at its upper end, a second limiting rod slidably connected to the upper side wall of the intermediate air chamber, and a second sealing plate disposed at the lower end of the second limiting rod and capable of blocking the second through hole.

[0019] Furthermore, a first spring is sleeved on the outer end of the first limiting rod, with one end set on the first sealing plate and the other end set on the side wall of the transition liquid chamber. A second spring is sleeved on the outer end of the second limiting rod, with one end set on the second sealing plate and the other end set on the side wall of the transition gas chamber. The upper ends of the first and second limiting rods are connected to a metal plate that can be attracted by magnetic force. The fixing frame is provided with a magnetic suction plate that can magnetically attract the metal plate. In the normal non-working state of the injection tube, the magnetic suction plate and the metal plate are attracted to each other.

[0020] Furthermore, the second valve assembly includes a fixed spacer ring disposed within the injection chamber and having an inverted frustum-shaped flow port at its upper end, a flow-blocking plug adapted to the flow port, and a push rod disposed on the lower surface of the flow-blocking plug and movably connected to the flow port; the outer surface of the injection tube has limiting grooves on both sides that communicate with the injection chamber and are isolated from the jet chamber, a sliding plate that limits sliding within the limiting groove is disposed therein, a sealing plate for sealing the limiting groove is disposed on the side of the sliding plate near the injection chamber, the sealing plate is connected to the push rod through a connecting plate, and a push rod that can abut against the lower surface of the sliding plate is slidably connected to the fixed ring plate.

[0021] Compared with existing technologies, the advantages of this solution are: by integrating the mechanism for drying the packaged bottle with the conventional filling mechanism, this mechanism can simultaneously achieve the synchronous and continuous operation of drying and filling. At the same time, the gas used for drying can also form an airflow barrier layer above the liquid in the bottle during the filling process, preventing the liquid from splashing upwards and avoiding the problem of liquid contamination of the environment during the filling of blood products. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0023] Figure 1 This is a schematic diagram of the working assembly of the present invention;

[0024] Figure 2 This is a three-dimensional structural schematic diagram of the present invention;

[0025] Figure 3 This is a disassembly diagram of the driving component in this invention;

[0026] Figure 4 This is a schematic diagram of the structural fit between the injection tube and the connecting part in this invention;

[0027] Figure 5 This is a schematic diagram of the connecting part in this invention;

[0028] Figure 6 This is a schematic diagram of the injection tube structure in this invention;

[0029] Figure 7 This is a three-dimensional cross-sectional view of the injection tube in this invention;

[0030] Figure 8 This is a schematic diagram of the internal structure of the second valve group in this invention;

[0031] Figure 9 This is a schematic diagram of the internal structure of the first valve group in this invention;

[0032] Figure 10 This is the present invention. Figure 7 Enlarged diagram of point A in the middle.

[0033] In the diagram: 1. Machine base; 2. Fixing frame; 21. Injection tube; 22. Fixing ring plate; 23. Friction arm; 3. Injection chamber; 31. Infusion hose; 4. Jet chamber; 41. Gas delivery hose; 42. Jet nozzle; 43. Jet outlet; 5. Drive motor; 51. Reciprocating threaded screw; 52. Screw sleeve; 53. Limiting slider; 54. Limiting groove rail; 6. Connecting arm; 61. Linkage rod; 62. Pushing slip ring; 7. Transition liquid tank; 71. First through hole; 72. 73. First partition; 74. First limiting rod; 75. First sealing plate; 76. Transition gas chamber; 77. Second through hole; 78. Second partition; 79. Second limiting rod; 80. Second sealing plate; 81. First spring; 82. Second spring; 83. Metal plate; 94. Magnetic suction plate; 95. Flow port; 96. Fixed spacer ring; 97. Flow plug; 98. Push rod; 99. Limiting groove; 90. Sliding plate; 91. Sealing plate; 92. Connecting plate; 93. Push rod. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] like Figure 1-10 The tabletop dispensing machine shown includes a machine base 1, a fixed frame 2 on the machine base 1, an injection tube 21 for filling and a drive assembly for driving the injection tube 21 to move up and down reciprocally; the injection tube 21 is provided with a drying section for spraying air into the filling bottle, a liquid injection section for injecting liquid into the bottle, a first valve group that jointly controls the opening and closing of the drying section and the liquid injection section, and a second valve group that independently controls the liquid injection section.

[0036] The filling process includes three working states. First, the injection tube 21 moves downwards, at which point the first valve group opens and the second valve group closes. The drying section sprays air downwards into the bottle to dry the contents. When the injection tube 21 moves to the bottom and returns, the second valve group opens, and the injection section begins to inject the liquid into the bottle. The drying section and the injection section work simultaneously, and the airflow generated by the drying section is located above the injection section. This creates a continuous airflow layer above the liquid injected into the bottle during filling. This airflow layer isolates the splashed liquid, preventing it from adhering to the surface of the upper end of the injection tube 21 or splashing out of the bottle opening. Finally, when the injection tube 21 returns to its original position, the first valve group opens and the second valve group closes. The drying section and the injection section stop working simultaneously, allowing drying and filling to be completed synchronously. The overall process has high continuity and can effectively improve filling efficiency.

[0037] In one embodiment, the injection unit includes an injection chamber 3 disposed inside the injection tube 21 and open at the bottom, and an infusion hose 31 with one end connected to the injection chamber 3 and the other end connected to the machine 1. The machine 1 pumps the drug into the infusion hose 31 through the liquid storage mechanism provided at its upper end, and then transports it to the injection chamber 3 through the infusion hose 31, and sprays it out from the opening at its lower end for filling.

[0038] In one embodiment, the drying unit includes a jet chamber 4 disposed between the injection chamber 3 and the injection tube 21 and isolated from the injection chamber 3, a gas delivery hose 41 with one end connected to the jet chamber 4 and the other end connected to the machine tool 1, and a jet nozzle 42 disposed at the bottom end of the injection tube 21 and connected to the jet chamber 4. The jet nozzle 42 is evenly distributed with jet ports 43 facing the side ends. The machine tool 1 pumps airflow into the gas delivery hose 41 through a pumping mechanism. The airflow enters the jet chamber 4 and flows downward, and then sprays out through the jet ports 43 on the jet nozzle 42 to the circumferential side of the injection tube 21. The high-temperature airflow evaporates the residual cleaning liquid in the bottle, making the bottle dry. The opening direction of the jet port 43 ensures that when it sprays air, it forms an airflow layer that is emitted in a ring-shaped radial pattern towards the inner wall of the bottle. It can form a barrier above the liquid while the liquid is injected in the injection chamber 3, effectively preventing liquid splashing.

[0039] In one embodiment, the drive assembly includes a drive unit and a connecting unit for connecting the drive unit and the injection tube 21. The drive unit includes a drive motor 5 mounted on a fixed frame 2, a reciprocating threaded screw 51 rotatably mounted on the fixed frame 2 via a bearing bracket and connected to the drive motor 5, and a screw sleeve 52 that reciprocates up and down on the reciprocating threaded screw 51. Limiting sliders 53 are provided on both sides of the screw sleeve 52, and a limiting groove rail 54 adapted to the limiting sliders 53 is provided on the fixed frame 2. The connecting unit includes a part with one end mounted on the screw sleeve 52 and the other end sliding with the injection tube 21. The device includes a connecting arm 6, a linkage rod 61 located at the lower end of the connecting arm 6, and a sliding ring 62 connected to the end of the linkage rod 61 away from the connecting arm 6 and slidably sleeved with the injection tube 21. A fixing ring plate 22 is provided on the injection tube 21 near the nozzle 42. The sliding ring 62 is located between the fixing ring plate 22 and the nozzle 42, and the linkage rod 61 slides through the fixing ring plate 22. A friction arm 23 is provided on the fixing frame 2 to clamp and abut against both sides of the outer surface of the injection tube 21. The friction between the friction arm 23 and the injection tube 21 is greater than that between the sliding ring 62 and the friction. Under normal conditions, the friction between the push ring 62 and the injection tube 21 causes the push ring 62 to abut against the lower surface of the fixed ring plate 22. When injection begins, the drive motor 5 drives the reciprocating threaded screw 51 to rotate, which in turn causes the screw sleeve 52 to move downward. The screw sleeve 52 drives the linkage rod 61 downward through the connecting arm 6. Since the injection tube 21 is clamped and abutted by the friction arm 23, and the friction between the two is greater than the friction between the push ring 62 and the injection tube 21, the push ring 62 will slide downward first and abut against the surface of the jet nozzle 42. Then, the jet nozzle 42 will abut against the surface of the jet nozzle 42. The nozzle 42 drives the injection tube 21 to move downward. At this time, the injection tube 21 will slide relative to the friction arm 23, thus moving downward slowly as a whole. When the screw sleeve 52 slides to a certain distance, the injection tube 21 enters the bottle and is at a certain distance from the bottle body. At this time, the screw sleeve 52 begins to move upward under the rotation of the reciprocating screw 51. At this time, the push slip ring 62 disengages from the nozzle 42, and the push slip ring 62 begins to abut against the lower surface of the fixed ring plate 22. Then, by abutting against the fixed ring plate 22, the injection tube 21 moves upward and returns to its original position.

[0040] In one embodiment, the first valve assembly includes a liquid valve for controlling the injection section and an air valve for controlling the drying section; the liquid valve includes an intermediate liquid chamber 7 disposed between and communicating with the injection chamber 3 and the infusion hose 31, a first partition 72 disposed within the intermediate liquid chamber 7 and having a first through hole 71 at its upper end, a first limiting rod 73 slidably connected to the upper side wall of the intermediate liquid chamber 7, and a first sealing plate 74 disposed at the lower end of the first limiting rod 73 and capable of blocking the first through hole 71; the air valve includes an intermediate air chamber 75 disposed between and communicating with the air jet chamber 4 and the air infusion hose 41, a second partition 77 disposed within the intermediate air chamber 75 and having a second through hole 76 at its upper end, a second limiting rod 78 slidably connected to the upper side wall of the intermediate air chamber 75, and a second sealing plate 74 disposed at the lower end of the second limiting rod 78 and capable of blocking the second through hole 76. The sealing plate 79 has a first spring 8 with one end set on the first sealing plate 74 and the other end set on the side wall of the transition liquid chamber 7. The outer end of the second limiting rod 78 has a second spring 81 with one end set on the second sealing plate 79 and the other end set on the side wall of the transition gas chamber 75. The upper ends of the first limiting rod 73 and the second limiting rod 78 are connected to a metal plate 82 that can be attracted by magnetic force. The fixing frame 2 is provided with a magnetic suction plate 83 that can magnetically attract the metal plate 82. In the normal non-working state of the injection tube 21, the magnetic suction plate 83 and the metal plate 82 are attracted to each other. The second valve group includes a fixed spacer ring 91 set in the injection chamber 3 and having an inverted frustum-shaped flow port 9 at the upper end, a flow plug 92 adapted to the flow port 9, and a push rod 93 set on the lower surface of the flow plug 92 and movably connected to the flow port 9.The outer surface of the injection tube 21 is provided with limiting grooves 94 on both sides, which are connected to the injection chamber 3 and isolated from the jet chamber 4. A sliding plate 95 is provided in the limiting groove 94 to limit its sliding. A sealing plate 96 is provided on the side of the sliding plate 95 near the injection chamber 3 to block the limiting groove 94. The sealing plate 96 is connected to the push rod 93 through the connecting plate 97. A push rod 98 that can abut against the lower surface of the sliding plate 95 is slidably connected on the fixed ring plate 22. Under normal conditions, the liquid storage mechanism on the machine 1 fills the transition liquid tank 7 with liquid, while the gas storage mechanism fills the transition gas tank 75 with gas. At this time, the metal plate 82 is attracted to the magnetic plate 83, so that the first sealing plate 74 and the second sealing plate 79 respectively block the first through hole 71 on the first partition 72 and the second through hole 76 on the second partition 77. The first spring 8 and the second spring 81 are compressed. When the push-slip ring 62 abuts against the jet nozzle 42 and drives the injection tube 21 to move downward, the flow-blocking plug 92 falls into the flow port 9 under the action of gravity to block it. After the injection tube 21 moves a certain distance and the metal plate 82 is detached from the magnetic plate 83, the first sealing plate 74 and the second sealing plate 79 are in a state of... The first spring 8 and the second spring 81 rebound, causing the first through hole 71 and the second through hole 76 to open. The liquid in the transition liquid chamber 7 is transported into the injection chamber 3 and blocked at the plug 92. Meanwhile, the gas in the transition gas chamber 75 flows into the jet chamber 4 and is directly ejected from the jet nozzle 42. This dries the contents of the encapsulated bottle as the injection tube 21 moves downward. When the injection tube 21 reaches the bottom, the push ring 62 moves back and pushes the push rod 98 to slide upward within the fixed ring plate 22. As a result, the push rod 98 abuts against the sliding plate 95 and, through the connecting... The connecting plate 97 moves the push rod 93 upward, opening the channel of the flow port 9. At this time, the liquid is sprayed downward from the injection chamber 3 and injected into the cavity. Simultaneously, the push slip ring 62 moves upward, causing the injection tube 21 to move upward, thus realizing the liquid injection work when the injection tube 21 moves upward. When the injection tube 21 returns to its original position, the magnetic suction plate 83 will attract the metal plate 82, causing the first sealing plate 74 and the second sealing plate 79 to block the first through hole 71 and the second through hole 76 again, thereby stopping the liquid injection and air spraying work of the injection tube 21. This completes one filling operation.

[0041] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A filling mechanism for a desktop dispensing machine, comprising a machine base (1), characterized in that: The machine (1) is provided with a fixed frame (2), and the fixed frame (2) is provided with an injection tube (21) for filling and a drive assembly for driving the injection tube (21) to move up and down reciprocally. The injection tube (21) is provided with a drying section for spraying air into the filling bottle, a liquid injection section for injecting liquid into the bottle, a first valve group that jointly controls the opening and closing of the drying section and the liquid injection section, and a second valve group that independently controls the liquid injection section. The injection unit includes an injection chamber (3) located inside the injection tube (21) and open at the bottom, and an infusion hose (31) with one end connected to the injection chamber (3) and the other end connected to the machine (1). The drying section includes a jet chamber (4) disposed between the injection chamber (3) and the injection tube (21) and isolated from the injection chamber (3), a gas delivery hose (41) with one end connected to the jet chamber (4) and the other end connected to the machine (1), and a jet nozzle (42) disposed at the bottom end of the injection tube (21) and connected to the jet chamber (4). The first valve group includes a liquid valve for controlling the injection section and a gas valve for controlling the drying section; The liquid valve includes an intermediate liquid chamber (7) disposed between and connected to the injection chamber (3) and the infusion hose (31), a first partition (72) disposed in the intermediate liquid chamber (7) and having a first through hole (71) at its upper end, a first limiting rod (73) slidably connected to the upper side wall of the intermediate liquid chamber (7), and a first sealing plate (74) disposed at the lower end of the first limiting rod (73) and capable of blocking the first through hole (71). The valve includes an intermediate air chamber (75) disposed between and connected to the air delivery hose (41), a second partition (77) disposed in the intermediate air chamber (75) and having a second through hole (76) at its upper end, a second limiting rod (78) slidably connected to the upper side wall of the intermediate air chamber (75), and a second sealing plate (79) disposed at the lower end of the second limiting rod (78) and capable of blocking the second through hole (76). The second valve assembly includes a fixed spacer ring (91) disposed in the injection chamber (3) and having an inverted frustum-shaped flow port (9) at its upper end, a flow plug (92) adapted to the flow port (9), and a push rod (93) disposed on the lower surface of the flow plug (92) and movably connected to the flow port (9). The injection tube (21) includes the following operating states: When the injection tube (21) moves downward, the first valve group opens and the second valve group closes, and the drying section works; When the injection tube (21) moves to the bottom and back, the second valve group opens, and the injection section and the drying section work simultaneously; When the injection tube (21) is moved back to its original position, the first valve group opens and the second valve group closes, and the drying section and the injection section stop working.

2. The filling mechanism of the desktop dispensing machine according to claim 1, characterized in that: The jet nozzle (42) is provided with jet ports (43) evenly distributed towards the side.

3. The filling mechanism of the desktop dispensing machine according to claim 2, characterized in that: The drive assembly includes a drive unit and a connecting unit for connecting the drive unit to the injection tube (21).

4. The filling mechanism of the desktop dispensing machine according to claim 3, characterized in that: The drive unit includes a drive motor (5) mounted on a fixed frame (2), a reciprocating threaded screw (51) rotatably mounted on the fixed frame (2) and connected to the drive motor (5) via a bearing frame, and a screw sleeve (52) that reciprocates up and down on the reciprocating threaded screw (51). The lead screw sleeve (52) is provided with limit sliders (53) on both sides, and the fixed frame (2) is provided with a limit groove (54) adapted to the limit sliders (53).

5. The filling mechanism of the desktop dispensing machine according to claim 4, characterized in that: The connecting part includes a connecting arm (6) with one end set on the lead screw sleeve (52) and the other end slidably sleeved with the injection tube (21), a linkage rod (61) set at the lower end of the connecting arm (6), and a pusher slip ring (62) connected to the end of the linkage rod (61) away from the connecting arm (6) and slidably sleeved with the injection tube (21). A fixed ring plate (22) is provided on the injection tube (21) near the nozzle (42). The push-slip ring (62) is located between the fixed ring plate (22) and the nozzle (42), and the linkage rod (61) slides through the fixed ring plate (22). The fixed frame (2) is provided with friction arms (23) that clamp and abut against both sides of the outer surface of the injection tube (21). The friction force between the friction arm (23) and the injection tube (21) is greater than the friction force between the push-slip ring (62) and the injection tube (21).

6. The filling mechanism of the desktop dispensing machine according to claim 1, characterized in that: The outer end of the first limiting rod (73) is sleeved with a first spring (8) with one end set on the first sealing plate (74) and the other end set on the side wall of the transition liquid tank (7). The outer end of the second limiting rod (78) is sleeved with a second spring (81) with one end set on the second sealing plate (79) and the other end set on the side wall of the transition gas tank (75). The upper ends of the first limiting rod (73) and the second limiting rod (78) are connected to a metal plate (82) that can be attracted by magnetic force. The fixing frame (2) is provided with a magnetic suction plate (83) that can magnetically attract the metal plate (82). When the injection tube (21) is not in normal working condition, the magnetic plate (83) and the metal plate (82) are attracted to each other.

7. The filling mechanism of the desktop dispensing machine according to claim 5, characterized in that: The outer surface of the injection tube (21) is provided with limiting grooves (94) that communicate with the injection chamber (3) and are isolated from the jet chamber (4). A sliding plate (95) is provided in the limiting groove (94) for limiting and sliding. A sealing plate (96) for sealing the limiting groove (94) is provided on the side of the sliding plate (95) near the injection chamber (3). The sealing plate (96) is connected to the push rod (93) through the connecting plate (97). A push rod (98) that can abut against the lower surface of the sliding plate (95) is slidably connected to the fixing ring plate (22).

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