A glue injection device

Abstract

The utility model discloses a kind of glue injection devices, relate to fluid conveying equipment technical field.The utility model connects by movable end and drive assembly, drive assembly moves movable end by first power source drive, realizes first re-drive;While movable end separates glue injection container into independent power cavity and containing cavity, power cavity is connected with second power source, second power source can further promote movable end to move by power cavity, to realize second re-drive.Meanwhile, the utility model does not need to increase the normal working pressure of drive assembly, but by first power source and second power source double drive movable end extruding glue in glue injection container, in the case where the working load of drive assembly is not increased, the provided thrust is more sufficient, can effectively solve the problem that single pressure push appears insufficient thrust when high viscosity colloid flow resistance is big, and lead to feed interruption or glue discharge uneven.

Description

Technical Field

[0001] This utility model relates to the field of fluid transport equipment technology, and in particular to a glue injection device. Background Technology

[0002] In industrial manufacturing fields such as electronics and automobiles, it is often necessary to precisely coat high-viscosity single-component sealants, such as those used to encapsulate electronic controllers (VCU, MCU, BMS) for new energy vehicles.

[0003] In existing technologies, the method of directly pushing the piston of the glue cylinder with a cylinder is often used for glue injection. However, when applying glue with high viscosity components, the viscosity of the glue increases. Due to the high flow resistance of high viscosity glue, the thrust required for glue extrusion is greater. Relying solely on the cylinder to push the piston may result in insufficient thrust, leading to defects such as interruption of material supply or uneven glue dispensing. On the other hand, if the thrust is increased by increasing the air pressure of the cylinder, the actual working pressure of the cylinder may exceed the bearing capacity of the cylinder shell, resulting in cylinder damage. Summary of the Invention

[0004] The main purpose of this invention is to propose a glue injection device that solves the technical problem that existing glue injection devices, when applied to high-viscosity fluids, may suffer from insufficient thrust due to the single-pressure piston driven by a cylinder, leading to interruption of material supply or uneven glue dispensing.

[0005] To achieve the above objectives, this utility model proposes a glue dispensing device, comprising: a glue dispensing container; a driving assembly connected to the glue dispensing container, the driving assembly having a movable end driven by a first power source; the movable end being movably disposed within the inner cavity of the glue dispensing container, and the movable end dividing the inner cavity of the glue dispensing container into an independent power cavity and a receiving cavity; the receiving cavity being used to hold glue; the power cavity being connected to a second power source, the second power source and the first power source jointly driving the movable end to move toward the receiving cavity, thereby squeezing out the glue in the receiving cavity.

[0006] Preferably, the drive assembly includes a pneumatic element, which includes a housing and a piston rod. The piston rod is movably disposed inside the housing, with one end of the piston rod passing through the housing and connected to a movable end, and the other end of the piston rod being sealed to the inner cavity of the housing. The housing has a first air inlet and a second air inlet communicating with the inner cavity at both ends, and the first air inlet and the second air inlet are connected to a first power source.

[0007] Preferably, the first power source and the second power source are input through a power main pipe; the outlet end of the power main pipe is connected to the inlet end of the three-way valve; one outlet end of the three-way valve is connected to the second air inlet, and the other outlet end of the three-way valve is connected to both the first air inlet and the power chamber through a three-way pipe.

[0008] Preferably, a first pressure regulating valve and a second pressure regulating valve are provided on the power main pipe; the first pressure regulating valve is located between the inlet end of the power main pipe and the three-way valve; the second pressure regulating valve is located between the three-way pipe and the power chamber.

[0009] Preferably, the drive assembly and the dispensing container are connected by a connecting flange; the housing is sealed to one end of the connecting flange, and the dispensing container is sealed to the other end of the connecting flange; a through hole is provided in the center of the connecting flange, and the piston rod passes through the through hole in the center of the connecting flange and is connected to the movable end of the dispensing container's inner cavity.

[0010] Preferably, the cavity between the connecting flange and the movable end forms a power cavity, and a third air inlet communicating with the power cavity is provided on the end face of the connecting flange. The third air inlet is connected to the power main pipe.

[0011] Preferably, the dispensing container includes an inner cylinder and an outer shell arranged coaxially, with the movable end sealed and movably disposed inside the inner cylinder; the connecting flange includes a protrusion that protrudes into the inner cavity of the inner cylinder, and the connecting flange is sealed to the inner wall of the inner cylinder by a sealing element.

[0012] Preferably, the connecting flange and the injection container are connected by a quick-release clamp; the connecting flange has a protruding first connecting flange in the circumferential direction, and the outer shell has a second connecting flange at its end; the quick-release clamp ensures that the first connecting flange and the second connecting flange fit together tightly.

[0013] Preferably, the outlet end of the dispensing container is connected to the metering screw valve via an adapter, which includes a first connecting part and a second connecting part with different outer diameters and coaxially arranged; the outlet end of the inner cylinder is connected to the first connecting part with a smaller inner diameter, and the outlet end of the outer shell is connected to the second connecting part with a larger inner diameter.

[0014] Preferably, a first sensor for measuring the piston rod stroke is provided on the housing.

[0015] Compared with existing technologies, the advantages of this invention are as follows: By connecting the movable end to the driving component, the driving component drives the movable end to move through a first power source, achieving a first-level drive; simultaneously, the movable end divides the dispensing container into an independent power chamber and a receiving chamber. The power chamber is connected to a second power source, which can further push the movable end to move through the power chamber, thus achieving a second-level drive. The movable end moves within the dispensing container's inner cavity. When the movable end moves towards the receiving chamber, it can squeeze the space within the receiving chamber, thereby squeezing out the adhesive. Furthermore, this invention does not require increasing the normal operating pressure of the driving component; instead, it increases the pushing force of the movable end by adding a second power source to the power chamber within the dispensing container. This invention, through the dual drive of the first and second power sources, provides more sufficient thrust without increasing the workload of the driving component. This effectively solves the problems of insufficient thrust leading to interrupted supply or uneven dispensing when single-pressure pushing occurs due to high viscosity adhesive flow resistance. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0017] Figure 1 This is a front view schematic diagram of the present utility model; Figure 2 A front view schematic diagram of the drive assembly, dispensing container, and metering screw valve; Figure 3 A three-dimensional structural diagram of the drive component and the dispensing container; Figure 4 This is a side view of the drive assembly and the dispensing container. Figure 5 for Figure 4 Schematic diagram of the cross section of AA; Figure 6 for Figure 5 Enlarged view of region B in the middle; Figure 7 for Figure 5 Enlarged view of region C in the middle; Figure 8 for Figure 6 A magnified diagram of region D in the middle.

[0018] In the diagram: 1. Drive assembly; 10. Power main pipe; 11. First pressure regulating valve; 12. Fixed bracket; 13. Three-way valve; 131. First outlet pipe; 132. Three-way connector; 14. Second pressure regulating valve; 141. Second outlet pipe; 15. Pneumatic component; 151. Housing; 152. Piston rod; 153. First air inlet; 154. Second air inlet; 155. First sensor; 16. Connecting flange; 161. Protrusion; 1 62. First connecting flange; 163. Seal; 164. Third air inlet; 17. Quick-release clamp; 2. Glue injection container; 21. Outer shell; 211. Second connecting flange; 212. First threaded section; 22. Inner cylinder; 221. Third connecting flange; 222. Second threaded section; 223. Power chamber; 224. Receiving chamber; 23. Movable end; 24. Rubber protective sleeve; 25. Adaptor; 3. Metering screw valve; 4. Electrical control system.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0021] Implementation 1 In this embodiment, as Figures 1-6 The illustrated dispensing device includes a dispensing container 2 and a drive assembly 1. The drive assembly 1 is mounted on the dispensing container 2 and has a movable end 23 driven by a first power source. The movable end 23 is movably disposed within the inner cavity of the dispensing container 2, dividing the inner cavity into an independent power cavity 223 and a receiving cavity 224. The receiving cavity 224 is used to hold adhesive. The power cavity 223 is connected to a second power source, which, together with the first power source, drives the movable end 23 towards the receiving cavity 224, thereby extruding the adhesive from the receiving cavity 224.

[0022] In this embodiment, by connecting the movable end 23 to the driving component 1, the driving component 1 drives the movable end 23 to move via a first power source, achieving a first-level drive. Simultaneously, the movable end 23 divides the dispensing container 2 into an independent power chamber 223 and a receiving chamber 224. The power chamber 223 is connected to a second power source, which can further push the movable end 23 to move via the power chamber 223, thus achieving a second-level drive. The movable end 23 moves within the dispensing container 2. When the movable end 23 moves towards the receiving chamber 224, it can compress the space within the receiving chamber 224, thereby squeezing out the adhesive within the receiving chamber 224. This invention provides more sufficient thrust by using both the first and second power sources to drive the movable end to squeeze out the adhesive from the dispensing container 2. This effectively solves the problems of insufficient thrust leading to interrupted feeding or uneven dispensing when single-pressure pushing results in high-viscosity adhesives with high flow resistance.

[0023] In this embodiment, the first power source and the second power source can be provided by the same power system or they can come from different power systems.

[0024] Optionally, the first and second power sources can be high-pressure air or liquid, and the movable end can be driven by pneumatic or hydraulic pressure.

[0025] Example 2 This embodiment provides an optional solution for the specific structure of the driving component, based on Embodiment 1.

[0026] In this embodiment, both the first power source and the second power source are compressed air.

[0027] In this embodiment, as Figures 1-3 As shown, one installation state of the drive assembly 1 and the dispensing container 2 is as follows: the drive assembly 1 is installed above the dispensing container 2.

[0028] In this embodiment, as Figures 1-6 As shown, the drive assembly 1 includes a pneumatic element 15, specifically, the pneumatic element 15 is a cylinder.

[0029] In this embodiment, the pneumatic component 15 includes a housing 151 and a piston rod 152. The piston rod 152 is movably disposed inside the housing 151. One end of the piston rod 152 passes through the housing 151 and is connected to the movable end 23. The other end of the piston rod 152 is sealed to the inner cavity of the housing 151. The two ends of the housing 151 are provided with a first air inlet 153 and a second air inlet 154 communicating with the inner cavity. The first air inlet 153 and the second air inlet 154 are connected to a first power source.

[0030] In this embodiment, compressed air is input from the power main pipe 10; the power main pipe 10 is provided with a first pressure regulating valve 11 and a second pressure regulating valve 14; the first pressure regulating valve 11 is located between the inlet of the power main pipe 10 and the three-way valve 13; the second pressure regulating valve 14 is located between the three-way valve 13 and the power chamber 223.

[0031] In this embodiment, a fixing bracket 12 is installed on the outer peripheral wall of the housing 151. The fixing bracket 12 is used to fix the power main pipe 10, the first pressure regulating valve 11, the three-way valve 13, and the second pressure regulating valve 14. The structure of the fixing bracket 12 can be adapted to the outline and size of the power main pipe 10, the first pressure regulating valve 11, the three-way valve 13, and the second pressure regulating valve 14, as long as they can be installed on the housing 151. This embodiment does not impose any limitations.

[0032] In this embodiment, the first power source and the second power source are provided through the same power system.

[0033] Specifically, compressed air is regulated by the first pressure regulating valve 11 from the main power pipe to form a first power source, which is then input to the first air inlet 153 or the second air inlet 154; the first power source is regulated by the second pressure regulating valve 14 to form a second power source, which is then input to the power chamber 223.

[0034] In this embodiment, a three-way valve 13 is provided on the power main pipe 10. The inlet end of the three-way valve 13 is connected to the outlet end of the power main pipe 10. One outlet end of the three-way valve 13 is connected to the second air inlet 154 through a first outlet pipe 131. The other outlet end of the three-way valve 13 is connected to the inlet of a three-way connector 132. The two outlet ends of the three-way connector 132 are respectively connected to the first air inlet 153 and the inlet end of the second pressure regulating valve 14. The outlet end of the second pressure regulating valve 14 is provided with a second outlet pipe 141, which is connected to the third air inlet 164.

[0035] Specifically, the compressed air input from the power main pipe 10 is regulated by the first pressure regulating valve 11 to form the first power source, which flows to the first air inlet 153, the second air inlet 154 and the second pressure regulating valve 14.

[0036] In this embodiment, the three-way valve 13 is a manual three-way valve, such as... Figure 3 As shown, the manual three-way valve includes a manually toggle switch, with different switch positions connecting the inlet end of the three-way valve 13 to different outlet ends. The first pressure regulating valve 11 can adjust the pressure of the entire system as needed by regulating the air pressure input into the power main 10. The second pressure regulating valve 14 can regulate the pressure input into the power chamber 223.

[0037] In this embodiment, as Figure 5 and Figure 6 As shown, the movable end 23 is a piston head, which is threadedly connected to the end of the piston rod 152. The surface of the piston head is covered with a rubber protective sleeve 24. The rubber protective sleeve 24 is used to seal the gap between the piston head and the inner wall of the glue injection container 2, so that the movable end 23 can divide the inner cavity of the glue injection container 2 into an independent power cavity 223 and a receiving cavity 224.

[0038] In this embodiment, both the first pressure regulating valve 11 and the second pressure regulating valve 14 are cylinder pressure regulating valves. Cylinder pressure regulating valves are commercially available products, and their working principle and structure will not be described in detail here.

[0039] In this embodiment, a first sensor 155 for measuring the stroke of the piston rod 152 is provided on the housing 151; a magnetic ring is provided at the end of the piston rod 152 located in the inner cavity of the housing 151.

[0040] Specifically, the first sensor 155 is a magnetic switch. Magnetic switches are provided at both the top and bottom of the housing 151. In this embodiment, the stroke of the pneumatic component 15 is detected by detecting the position of the magnetic ring of the piston rod 152 through the magnetic switch.

[0041] It should be noted that detecting cylinder stroke through a magnetic switch is a common technique in this field, and its structure, principle, and installation method will not be elaborated here.

[0042] In this embodiment, the outlet end of the glue injection container 2 is connected to a metering screw valve 3. The glue in the glue injection container 2 is pushed into the metering screw valve 3 by the piston head and then output to the outside. The metering screw valve 3 is used to measure the amount of glue output. A pressure sensor is installed on the pipeline connecting the metering screw valve 3 and the outlet end of the glue injection container 2. The pressure sensor is used to measure the pressure change of the output.

[0043] In this embodiment, the first pressure regulating valve 11, the second pressure regulating valve 14, the magnetic switch, the metering screw valve 3, and the pressure sensor are all electrically connected to the electronic control system 4.

[0044] In this embodiment, the pressure sensor and the metering screw valve 3 work together to facilitate the realization of functions such as dispensing speed, dispensing volume, screw valve inlet pressure value, and low material (pressure too low) alarm.

[0045] In one possible embodiment, when air is present in the adhesive, since air inevitably mixes into the adhesive during the replacement process after the adhesive is used up, or the adhesive itself contains air bubbles, when the air (air bubbles) reaches the pipeline connecting the metering screw valve 3 and the outlet end of the dispensing container 2, it will cause the pressure to drop. At this time, the pressure sensor will detect the change in pressure value. When it exceeds the preset value and exceeds the preset pressure alarm delay time, the pressure monitoring alarm of the electronic control system 4 will be triggered.

[0046] In another possible embodiment, when the glue clumps or has a large viscosity difference, the glue output to the inlet of the metering screw valve 3 will cause the feeding pressure to increase. When the pressure exceeds the preset pressure value and exceeds the preset pressure alarm delay time, the pressure monitoring alarm of the electronic control system 4 will be triggered.

[0047] In another possible embodiment, when the connecting pipe between the metering screw valve 3 and the glue injection container 2 is blocked, its pressure value increases. When it exceeds the preset pressure value and exceeds the preset pressure alarm delay time, the pressure monitoring alarm of the electronic control system 4 is triggered.

[0048] Operating mode: When the movable end 23 needs to rise, the switch is flipped upwards, connecting the inlet of the three-way valve 13 to the second air inlet 154, thereby inputting compressed air into the inner cavity of the housing 1 from the lower end, pushing the movable end 23 upwards; when the movable end 23 needs to fall, the switch is flipped downwards, connecting the three-way valve 13 to both the first air inlet 153 and the second pressure regulating valve 14. The second pressure regulating valve 14 inputs the regulated compressed air into the power chamber 223, thereby inputting compressed air into the first air inlet 153 and the inner cavity of the power chamber 223. This allows the compressed air to push the piston rod 154 downwards from the first air inlet 153, thereby driving the movable end 23 downwards. At the same time, the compressed air diverted from the three-way pipe 132 also pushes the movable end 23 downwards from the power chamber 223, forming a dual drive. The adhesive is extruded from the dispensing container 2 by dual driving of the first and second power sources, providing more sufficient thrust. This effectively solves the problems of insufficient thrust caused by single-pressure pushing when the flow resistance of high-viscosity adhesive is large, resulting in interruption of material supply or uneven dispensing.

[0049] Example 3 This embodiment provides an optional solution for the connection structure between the drive component and the dispensing container, based on any of the above embodiments.

[0050] In this embodiment, as Figures 5-8 As shown, the dispensing container 2 includes an inner cylinder 22 and an outer shell 21 arranged coaxially, with the movable end 23 sealed and movably disposed within the inner cylinder 22. The drive assembly 1 is connected to the dispensing container 2 via a connecting flange 16.

[0051] Specifically, the connecting flange 16 has a through hole at its center, and the outer wall of the bottom end of the housing 151 has an external thread. The through hole at the center of the connecting flange 16 is a threaded hole, and the housing 151 and the connecting flange 16 are connected by threads. Furthermore, the housing 151 and the connecting flange 16 are sealed together by a sealing ring, thereby isolating the inner cavity of the housing 151 from the power chamber 223. The piston rod 152 passes through the bottom end of the housing 151 and connects to the movable end 23 of the inner cavity of the glue injection container 2.

[0052] In this embodiment, the drive component 15 is specifically a reciprocating cylinder.

[0053] It should be noted that the reciprocating cylinder is a commercially available product. The cylinder body (housing 151) and piston rod 152 of the reciprocating cylinder are connected by a dynamic seal, which isolates the inner cavity of the housing 151 from the outside when the piston rod 152 is moving. This makes the inner cavity of the power chamber 223 and the inner cavity of the housing 151 independent of each other during operation.

[0054] In this embodiment, as Figure 6 As shown, a protrusion 161 is provided at the end of the connecting flange 16 away from the drive assembly 1. The protrusion 161 protrudes into the inner cavity of the inner cylinder 22, and the connecting flange 16 and the inner wall of the inner cylinder 22 are sealed by a seal 163. The cavity between the protrusion 161 and the movable end 23 forms a power chamber 223. A third air inlet 164 communicating with the power chamber 223 is provided on the end face of the connecting flange 16. The third air inlet 164 is connected to the second pressure regulating valve 14.

[0055] In this embodiment, as Figure 3 , Figure 6 and Figure 8 As shown, the connecting flange 16 and the glue injection container 2 are connected by quick-release clamps 17.

[0056] Specifically, such as Figure 6 and Figure 8 As shown, the connecting flange 16 has a protruding first connecting flange 162 circumferentially, the outer shell 21 has a second connecting flange 211 at its end, and the inner cylinder 22 has a third connecting flange 221 at its top. An annular groove is provided between the first connecting flange 162 and the protrusion 161. The third connecting flange 221 is located within the annular groove and is pressed against the top surface of the second connecting flange 211 by the first connecting flange 162. The first connecting flange 162 and the second connecting flange 211 are connected by a quick-release clamp 17. The quick-release clamp 17 ensures a tight fit between the first connecting flange 162 and the second connecting flange 211.

[0057] It should be noted that the model of the quick-release clamp 17 can be selected according to the corresponding standard based on the outer diameter of the first connecting flange 162 and the second connecting flange 211. Furthermore, the clamp used to connect the two annular plates is a commercially available product; its structure, principle, and installation method will not be elaborated here.

[0058] In this embodiment, the outlet end of the dispensing container 2 is connected to the metering screw valve 3 via the adapter 25.

[0059] Specifically, such as Figure 7As shown, adapter 25 includes a first connecting part and a second connecting part with different outer diameters and coaxially arranged; the outlet end of the inner cylinder 22 has a first internal thread 222, and the outlet end of the outer shell 21 has a second internal thread 212. The first internal thread 222 connects to the first connecting part with the smaller outer diameter, and the second internal thread 212 connects to the second connecting part with the larger inner diameter. The metering screw valve 3 is connected to the outlet end of adapter 25.

[0060] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several equivalent substitutions or obvious modifications can be made without departing from the concept of the present invention, and all such modifications, with identical performance or use, should be considered within the protection scope of the present invention.

Claims

1. A glue dispensing device, characterized in that, include: Glue injection container (2); A drive assembly (1) is connected to the dispensing container (2), and the drive assembly (1) has a movable end (23) which is driven by a first power source. The movable end (23) is movably disposed in the inner cavity of the glue injection container (2), and the movable end (23) divides the inner cavity of the glue injection container (2) into an independent power cavity (223) and a receiving cavity (224). The receiving cavity (224) is used to receive the glue; The power cavity (223) is connected to a second power source, which together with the first power source drives the movable end (23) to move toward the receiving cavity (224), thereby squeezing out the glue in the receiving cavity (224).

2. The dispensing device as described in claim 1, characterized in that, The drive assembly (1) includes a pneumatic element (15), which includes a housing (151) and a piston rod (152). The piston rod (152) is movably disposed inside the housing (151). One end of the piston rod (152) passes through the housing (151) and is connected to the movable end (23). The other end of the piston rod (152) is sealed to the inner cavity of the housing (151). The housing (151) has a first air inlet (153) and a second air inlet (154) at both ends that communicate with the inner cavity. The first air inlet (153) and the second air inlet (154) are connected to a first power source.

3. The dispensing device as described in claim 2, characterized in that, The first power source and the second power source are input through the power main pipe (10); The outlet end of the main power pipe (10) is connected to the inlet end of the three-way valve (13); One outlet of the three-way valve (13) is connected to the second air inlet (154), and the other outlet of the three-way valve (13) is connected to both the first air inlet (153) and the power chamber (223) through the three-way pipe (132).

4. The dispensing device as described in claim 3, characterized in that, The power main pipe (10) is equipped with a first pressure regulating valve (11) and a second pressure regulating valve (14). The first pressure regulating valve (11) is located between the inlet end of the power main pipe (10) and the three-way valve (13); The second pressure regulating valve (14) is located between the three-way pipe (132) and the power chamber (223).

5. The dispensing device as described in claim 3, characterized in that, The drive assembly (1) is connected to the dispensing container (2) via a connecting flange (16); The housing (151) is sealed to one end of the connecting flange (16), and the glue injection container (2) is sealed to the other end of the connecting flange (16); The connecting flange (16) has a through hole in the center, and the piston rod (152) passes through the through hole in the center of the connecting flange (16) and connects to the movable end (23) of the inner cavity of the glue injection container (2).

6. The dispensing device as described in claim 5, characterized in that, The cavity between the connecting flange (16) and the movable end (23) forms a power cavity (223). A third air inlet (164) communicating with the power cavity (223) is provided on the end face of the connecting flange (16). The third air inlet (164) is communicating with the power main pipe (10).

7. The dispensing device as described in claim 6, characterized in that, The glue injection container (2) includes an inner cylinder (22) and an outer shell (21) arranged coaxially, and the movable end (23) is sealed and movably disposed inside the inner cylinder (22); The connecting flange (16) includes a protrusion (161) that protrudes into the inner cavity of the inner cylinder (22), and the connecting flange (16) is sealed to the inner wall of the inner cylinder (22) by a sealing element (163).

8. The dispensing device as described in claim 6, characterized in that, The connecting flange (16) and the glue injection container (2) are connected by a quick-release clamp (17); The connecting flange (16) is provided with a protruding first connecting flange (162) in the circumferential direction, and the end of the housing (21) is provided with a second connecting flange (211). The quick-release clamp (17) makes the first connecting flange (162) and the second connecting flange (211) fit together tightly.

9. The dispensing device as described in claim 7, characterized in that, The outlet end of the glue injection container (2) is connected to the metering screw valve (3) via an adapter (25). The adapter (25) includes a first connecting part and a second connecting part with different outer diameters and coaxially arranged. The outlet end of the inner cylinder (22) is connected to the first connecting part with a smaller inner diameter, and the outlet end of the outer shell (21) is connected to the second connecting part with a larger inner diameter.

10. The dispensing device as described in claim 2, characterized in that, The housing (151) is provided with a first sensor (155) for measuring the stroke of the piston rod (152).

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