Cylinder body for metering device and metering device

Abstract

The cylinder body is used for storing materials to be metered and output, the cylinder body comprises a body which is of a tubular structure, one end of the body is a feeding end and is provided with a first connecting port, the other end of the body is a discharging end and is provided with a discharging port, a material storage cavity is formed in the middle of the body, and the material storage cavity is communicated with the first connecting port. A metering rod of the metering device extends into the material storage cavity from the first connecting port and is in sliding and sealing fit with the first connecting port, materials in the material storage cavity are conveyed to the discharging port through linear motion, an annular gap is formed between the side wall of the metering rod and the side wall of the material storage cavity, and the cross section of the metering rod is circular; the feeding hole is formed in the outer wall of the body at the feeding end; the feeding channel and the side wall, located at the feeding end, of the body enable the feeding port to be communicated with the material storage cavity, the axis of the feeding channel is offset relative to the axis of the metering rod, impact force caused by materials to the metering rod is reduced, the unilateral compression amount of the guiding and sealing structure is reduced, and the stability of the guiding and sealing effect is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of metering device technology, and in particular to a cylinder body and a metering device for use in metering devices. Background Technology

[0002] Plunger-type metering devices are widely used in automated glue application equipment. By controlling the movement distance of the metering rod within the cylinder, the amount of glue dispensed can be controlled, achieving quantitative glue application. Plunger-type metering devices typically employ a linear drive mechanism to move the metering rod within the cylinder. Simultaneously, the metering rod contacts a sealing and guiding structure mounted on the cylinder, thus guiding the metering rod and sealing the cylinder.

[0003] Typically, the guiding and sealing materials of the metering rod are soft. Since the metering device requires refeeding after the material is discharged from the cylinder during use, the conventional cylinder structure has a feed inlet on the side wall. The material enters the cylinder through this inlet, and the material flow and pressure are generally high, causing significant impact on the valve rod inside the cylinder. This results in unilateral compression of the guiding and sealing structures, affecting the guiding and sealing performance. Utility Model Content

[0004] In view of the shortcomings of the existing production technology, the applicant provides a cylinder body and metering device for a metering device, which reduces the impact force of the material on the metering rod, reduces the unilateral compression of the guiding and sealing structure, and ensures the stability of the guiding and sealing effect.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A cylinder for a metering device, the cylinder for storing material to be metered and output, the cylinder comprising:

[0007] The main body is a tubular structure. One end of the main body is a feeding end with a first connection port, and the other end is a discharging end with a discharging port. The middle part of the main body is a storage chamber. The metering rod of the metering device extends into the storage chamber from the first connection port and slides and seals with the first connection port. It conveys the material in the storage chamber to the discharging port through linear motion. There is a circumferential gap between the side wall of the metering rod and the side wall of the storage chamber. The cross-section of the metering rod is circular.

[0008] The feed inlet is located on the outer wall of the main body at the feed end;

[0009] The feeding channel, located on the side wall of the main body at the feeding end, connects the feeding port to the storage cavity, and the axis of the feeding channel is offset relative to the axis of the metering rod.

[0010] As a further improvement to the above technical solution:

[0011] The projection of the feed channel outlet onto the outer wall of the metering rod deviates from the center of the metering rod.

[0012] The feed inlet corresponds to the axis of the metering rod, and the feed channel is inclined toward one side wall of the metering rod.

[0013] The circumferential gap is annular, and the fluid flow direction at the point furthest from the inlet on the intersection line of the feed channel and the side wall of the storage cavity is tangent to the side wall of the storage cavity.

[0014] The cross-sectional dimensions of the feeding channel include a cross-sectional width and a cross-sectional length. The cross-sectional length is consistent with the axial direction of the body, and the cross-sectional width is consistent with the radial direction of the body. The cross-sectional width gradually decreases along the material flow direction, and the cross-sectional length gradually increases along the material flow direction.

[0015] The material flowing out of the feed channel is tangent to the outer wall of the metering rod.

[0016] A metering device, comprising a cylinder body for metering as described above.

[0017] As a further improvement to the above technical solution:

[0018] The measuring rod is driven by a linear drive mechanism to reciprocate along a straight line. The measuring device also includes a floating connection structure that floats the measuring rod and the moving end of the linear drive mechanism.

[0019] A guide structure, which is sleeve-shaped, is installed at the first interface to slide with the measuring rod.

[0020] The ratio of the length of the guide structure to the diameter of the measuring rod is 0.4-2.

[0021] The floating connection structure includes a limiting ring fixedly installed on the moving end. The limiting ring has an annular groove that mates with the annular boss, limiting the annular boss between the annular groove and the moving end. There is a first gap between the annular boss and the annular groove along the axial direction of the measuring rod, and a second gap between the annular boss and the annular groove along the radial direction of the measuring rod. The first gap and the second gap allow the measuring rod to be floatingly connected to the moving end.

[0022] During the process of material entering the cylinder from the feed port and exiting from the discharge port, the annular boss contacts the moving end under the pressure of the material inside the cylinder.

[0023] The beneficial effects of this utility model are as follows:

[0024] This utility model has a compact and reasonable structure and is easy to operate. By offsetting the axis of the side feeding channel with the axis of the metering rod, the direct contact area between the material and the side wall of the metering rod is increased. This allows the material to enter the circumferential gap from the outer wall of the metering rod as much as possible, reducing the impact force of the material on the metering rod and reducing the unilateral compression of the guiding and sealing structure of the metering rod, thus ensuring the stability of the guiding and sealing effect.

[0025] This utility model also has the following advantages:

[0026] (1) The projection of the outlet of the feeding channel on the outer wall of the metering rod is deviated from the center of the metering rod, so that the projection of the outlet of the feeding channel on the outer wall of the metering rod is completely deviated from the center of the metering rod and located on one side of the side wall of the metering rod. Compared with the existing technology where the feeding channel is directly opposite the axis of the metering rod, the first point of contact between the material and the metering rod is located on one side of the side wall of the metering rod, reducing the impact force of the material on the metering rod.

[0027] (2) The inclined feed channel makes the flow of material tend to be tangent to the side wall of the metering rod, so that the circumferential gap structure can better disperse the impact force of the material on the metering rod.

[0028] (3) The cross-section of the feeding channel is set to a flat nozzle structure that changes with the direction of material flow, so that the material outlet extends along the axial direction of the metering rod and contracts along the radial direction of the metering rod, which greatly reduces the impact force of the material on the metering rod.

[0029] (4) The metering rod adopts a floating connection structure and is floatingly connected to the moving end of the linear drive mechanism, which can greatly increase the guiding length of the guiding structure. At the same time, hard materials such as metal can be selected to improve the fixed guiding effect of the metering rod. It can balance some of the impact force of the material while reducing the compression amount, making the metering rod move more smoothly during the feeding process and the sealing effect better. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the metering device of this utility model.

[0031] Figure 2 This is an exploded view of the metering device of this utility model.

[0032] Figure 3 This is a partial cross-sectional view of the measuring device of this utility model.

[0033] Figure 4 This is a schematic diagram of the feeding channel of a metering device according to an embodiment of the present invention. Figure 3 (Sectional view at point A in the middle).

[0034] Figure 5 This is a schematic diagram of the feeding channel of the metering device according to another embodiment of the present invention. Figure 3 (Sectional view at point A in the middle).

[0035] Figure 6 This is a schematic diagram of the cylinder body of a metering device according to an embodiment of the present invention.

[0036] Figure 7 This is a schematic diagram of the feeding channel of the metering device according to another embodiment of the present invention. Figure 3 (Sectional view at point A in the middle).

[0037] Figure 8 This is an isometric sectional view of the cylinder body of a metering device according to another embodiment of the present invention.

[0038] Figure 9 for Figure 3 Enlarged view of section B in the middle.

[0039] Figure 10 This is a schematic diagram of the assembly structure of the floating connection structure and the annular boss of this utility model.

[0040] in:

[0041] 100. Feed valve; 200. Discharge valve;

[0042] 1. Linear drive mechanism; 11. Motor; 12. Lead screw; 13. Lead nut; 14. Moving end;

[0043] 2. Floating connection structure; 21. Limiting ring; 211. Annular groove; 212. Insertion hole; 22. First limiting part;

[0044] 3. Measuring rod; 31. Annular boss; 311. Second limiting part;

[0045] 4. Guiding structure;

[0046] 5. Connector; 51. Through hole;

[0047] 6. Sealing structure; 61. Atmospheric pressure sealing ring; 62. Inner sealing ring; 63. Outer sealing ring;

[0048] 8. Cylinder body; 801. First connection port; 80. Body; 81. Feed inlet; 82. Discharge outlet; 83. Storage chamber; 84. Feed channel;

[0049] 9. Base; 901. Second connection port; 91. Supply port; 92. Transparent tube; 93. Support. Detailed Implementation

[0050] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0051] like Figures 1-6As shown, in one embodiment of the present invention, a cylinder body for a metering device is provided. The cylinder body 8 is used to store the material to be metered and output. The cylinder body 8 includes a body 80, a feed inlet 81, and a feed channel 84.

[0052] The main body 80 is a tubular structure. One end of the main body 80 is the feeding end and is provided with a first connection port 801. The other end is the discharging end and is provided with a discharging port 82. The middle part of the main body 80 is a storage chamber 83. The metering rod 3 of the metering device extends into the storage chamber 83 from the first connection port 801 and slides and seals with the first connection port 801. The material in the storage chamber 83 is conveyed to the discharging port 82 through linear motion. There is a circumferential gap between the side wall of the metering rod 3 and the side wall of the storage chamber 83. The cross-section of the metering rod 3 is circular.

[0053] The feed inlet 81 is located on the outer wall of the main body 80 at the feed end;

[0054] The feeding channel 84 is located on the side wall of the body 80 at the feeding end, connecting the feeding port 81 with the storage chamber 83. The axis of the feeding channel 84 is offset relative to the axis of the metering rod 3.

[0055] The metering device is a plunger-type metering device. In the prior art, the feed inlet 81 and the feed channel 84 are usually aligned with the axis of the metering rod 3. When the material enters the storage chamber 83 from the feed inlet 81, the material impacts the metering rod 3 head-on and then flows from the middle of the side wall of the metering rod 3 to both sides into the circumferential gap, eventually filling the storage chamber 83. Therefore, the impact force of the material on the metering rod 3 is relatively large. The guide and sealing ring, which are fixedly installed relative to the first connection port 801, slide and seal with the metering rod 3. In the prior art, multiple guide wear-resistant lips are usually used, which slide with the metering rod 3. After impact, the guide wear-resistant lips and the sealing ring undergo unilateral compression.

[0056] In this embodiment, the cylinder 8 used for the metering device increases the direct contact area between the material and the side wall of the metering rod 3 by offsetting the axis of the side feeding channel 84 with the axis of the metering rod 3. This allows the material to enter the circumferential gap from the side of the metering rod 3 first, following the outer wall of the metering rod 3. This reduces the impact force of the material on the metering rod 3, reduces the unilateral compression of the guiding and sealing structure of the metering rod 3, and ensures the stability of the guiding and sealing effect.

[0057] In one exemplary embodiment, the projection of the outlet of the feed channel 84 onto the outer wall of the metering rod 3 is offset from the center of the metering rod 3. For example... Figure 4 and Figure 5As shown, after the material enters the storage chamber 83, it first impacts one side of the axis of the metering rod 3, causing the projection of the outlet of the feeding channel 84 on the outer wall of the metering rod 3 to be completely deviated from the center of the metering rod 3 and located on one side of the side wall of the metering rod 3. Compared with the prior art where the feeding channel 84 is directly opposite the axis of the metering rod 3, this makes the first point of contact between the material and the metering rod 3 located on one side of the side wall of the metering rod 3, thus reducing the impact force of the material on the metering rod 3.

[0058] In this embodiment, as Figure 4 As shown, the feed inlet 81 corresponds to the axis of the metering rod 3, and the feed channel 84 is inclined toward one side wall of the metering rod 3.

[0059] Specifically, the axis of the feed inlet 81 intersects the axis of the metering rod 3, and the axis of the feed channel 84 forms an angle with the axis of the feed inlet 81.

[0060] In this embodiment, as Figures 4-6 As shown, the circumferential gap is annular, and the fluid flow direction at the point furthest from the inlet 81 on the intersection line of the feed channel 84 and the side wall of the storage chamber 83 is tangent to the side wall of the storage chamber 83.

[0061] The inclined feed channel 84 makes the flow of material tend to be tangent to the side wall of the metering rod 3, so that the circumferential gap structure can better disperse the impact force of the material on the metering rod 3.

[0062] The offset of the axis of the feed channel 84 can take various forms, as long as it ensures that as much material as possible first enters the circumferential gap from one side of the metering rod 3 along the outer wall of the metering rod 3. Figure 5 As shown, in an exemplary embodiment, the feed inlet 81 is coaxial with the feed channel 84, and the feed inlet 81 is offset from the axis of the metering rod 3. Preferably, the fluid flow direction at the point farthest from the feed inlet 81 on the intersection line of the feed channel 84 and the side wall of the storage cavity 83 is tangent to the side wall of the storage cavity 83.

[0063] In the above embodiments, the cross-sections of the feed channel 84 and the feed inlet 81 can be circular to facilitate processing and forming.

[0064] In another exemplary embodiment, such as Figure 7 , Figure 8 As shown, the cross-sectional dimensions of the feed channel 84 include the cross-sectional width W and the cross-sectional length L. The cross-sectional length L is consistent with the axial direction of the body 80, and the cross-sectional width W is consistent with the radial direction of the body 80. The cross-sectional width W gradually decreases along the material flow direction, and the cross-sectional length L gradually increases along the material flow direction.

[0065] In this embodiment, as Figure 7As shown, the material flowing out of the outlet of the feed channel 84 is tangent to the outer wall of the metering rod 3. The outlet of the feed channel 84 has a certain width, so the tangency refers to a macroscopic tangency, the purpose of which is to reduce the impact force of the material on the metering rod 3. The feed channel 84 can be formed by casting or by assembling after split processing.

[0066] The cross-section of the feed channel 84 is set to a flat nozzle structure that changes with the direction of material flow, so that the material outlet extends along the axial direction of the metering rod 3 and contracts radially along the metering rod 3, which greatly reduces the impact force of the material on the metering rod 3.

[0067] In one exemplary embodiment, such as Figures 1-10 As shown, this application provides a metering device, including a cylinder for metering devices according to any of the above embodiments.

[0068] The measuring rod 3 is driven by the linear drive mechanism 1 to reciprocate along a straight line. The measuring device also includes a floating connection structure 2, which floats the measuring rod 3 and the moving end 14 of the linear drive mechanism 1.

[0069] A guide structure 4, which slides with the measuring rod 3, is installed at the first connection port 801. The guide structure 4 is sleeve-shaped.

[0070] The guide structure 4 can be made of Teflon or an oil-free metal bushing, such as brass. The floating connection structure 2 can be a conventional floating joint or a non-standard structure. The floating connection structure 2 is used to absorb the coaxiality error between the metering rod 3, the guide structure 4, and the sealing structure 6.

[0071] The metering rod 3 adopts a floating connection structure 2 and is floatingly connected to the moving end 14 of the linear drive mechanism 1, which can greatly increase the guiding length of the guide structure 4. At the same time, hard materials such as metal can be used to improve the fixed guiding effect of the metering rod 3. It can balance some of the impact force of the material while reducing the compression amount, making the movement of the metering rod 3 smoother during the feeding process and the sealing effect better.

[0072] The ratio of the length of the guide structure 4 to the diameter of the measuring rod 3 is 0.4-2.

[0073] The floating connection structure 2 includes a limiting ring 21 fixedly installed on the moving end 14. The limiting ring 21 is provided with an annular groove 211 that cooperates with the annular boss 31, limiting the annular boss 31 between the annular groove 211 and the moving end 14. There is a first gap between the annular boss 31 and the annular groove 211 along the axial direction of the measuring rod 3, and there is a second gap between the annular boss 31 and the annular groove 211 along the radial direction of the measuring rod 3. The first gap and the second gap enable the measuring rod 3 to float and connect with the moving end 14.

[0074] During the process of material entering the cylinder 8 from the feed port 81 and being discharged from the discharge port 82, the annular boss 31 contacts the moving end 14 under the action of the material pressure inside the cylinder 8.

[0075] Specifically, the first gap refers to the maximum displacement that the annular boss 31 can move axially along the metering rod 3 within the annular groove 211, and the second gap refers to the maximum displacement that the annular boss 31 can move radially along the metering rod 3 within the annular groove 211. The radial direction of the metering rod 3 includes multiple diameter directions. The dimensions of the second gap and the first gap are compatible, which can meet the processing and assembly errors of the components associated with the metering rod 3. It is mainly used to absorb the coaxiality error between the metering rod 3 and the guide structure 4 and the sealing structure 6.

[0076] The measuring rod 3 is floatingly connected to the moving end 14 by the floating connection structure 2, so that the measuring rod 3 can move axially and radially under the action of external force. The measuring rod 3 can also deflect in the center hole of the annular groove 211, so that the axis of the measuring rod 3 is at an angle relative to the moving direction of the moving end 14.

[0077] The floating connection structure 2, which uses the annular boss 31 and the annular groove 211 to cooperate, allows the position of the measuring rod 3 to move adaptively according to the structure that needs to be coaxially coupled. The axial length of the floating connection structure 2 is small. Without increasing the overall size of the measuring device, the measuring rod 3 can be coaxial with the guide structure 4, sealing structure 6, etc. This allows the use of the guide structure 4 with a longer guide length and extends the service life of the guide structure 4 and the sealing structure 6.

[0078] In this embodiment, the feed inlet 81 of the metering device is equipped with a feed valve 100 that controls the material entering the cylinder 8, and the discharge outlet 82 is equipped with a discharge valve 200 that controls the material being discharged from the cylinder 8.

[0079] When the cylinder 8 needs to discharge material, the discharge valve 200 is opened, and the metering rod 3 moves into the cylinder 8. Under the action of the material pressure in the cylinder 8, the annular boss 31 of the metering rod 3 contacts the moving end 14.

[0080] When material needs to be fed into the cylinder 8, the metering rod 3 moves out of the cylinder 8 and simultaneously opens the feed valve 100. The feed pipeline delivers material into the cylinder 8. When the cylinder 8 is full of material, under the pressure of the material in the cylinder 8, the annular boss 31 of the metering rod 3 contacts the moving end 14.

[0081] The first gap and the second gap in the floating connection structure 2 are adapted to ensure that the attitude and axial position of the metering rod 3 relative to the moving end 14 remain unchanged during the discharge process, thus ensuring the accuracy of the metering device during use and not affecting the discharge volume.

[0082] To prevent the annular groove 211 and the annular boss 31 from rotating relative to each other during the use of the metering device, which would cause the metering rod 3 to rotate relative to the sealing structure 6 and affect the sealing performance, a first limiting part 22 is provided on the side wall of the annular groove 211, and a second limiting part 311 corresponding to the first limiting part 22 is provided on the outer peripheral surface of the annular boss 31. The second limiting part 311 cooperates with the first limiting part 22 to restrict the rotation of the metering rod 3 relative to the limiting ring 21.

[0083] There is a second gap between the first limiting part 22 and the second limiting part 311. The second limiting part 311 is a plane, and the bottom of the annular groove 211 is provided with an insertion hole 212. The first limiting part 22 is a pin structure, and the first limiting part 22 is inserted into the insertion hole 212.

[0084] The measuring device in this embodiment also includes a base 9. The mounting part of the linear drive mechanism 1 is fixedly connected to the base 9. The base 9 is fixedly connected to the cylinder 8. A second connection port 901 is provided on the base 9. Both the first connection port 801 and the second connection port 901 are stepped holes. The first connection port 801 and the second connection port 901 are arranged opposite to each other to form a limiting cavity. A tubular connecting seat 5 is sealed and installed inside the limiting cavity. A guide structure 4 and a sealing structure 6 are installed inside the connecting seat 5. The guide structure 4 and the sealing structure 6 slide and seal the first connection port 801 with the measuring rod 3.

[0085] Specifically, a bracket 93 is provided on the base 9, and the bracket 93 fixes the mounting part of the linear drive mechanism 1 to the base 9. When the linear drive mechanism 1 is driven by a motor, the linear drive mechanism 1 includes a motor 11 and a lead screw 12 that is transmitted to the output end of the motor 11. A lead screw nut 13 is installed on the lead screw 12 and is fixedly installed in the moving end 14. The moving end 14 is slidably connected to the base 9 through a guide rod. The rotation of the lead screw 12 is converted into linear motion of the moving end 14 through the lead screw nut 13, thereby driving the measuring rod 3 to move in a straight line.

[0086] The connecting seat 5 is used as the skeleton for installing the guide structure 4 and the sealing structure 6, which facilitates the overall assembly and disassembly of the guide structure 4 and the sealing structure 6, realizes the quick positioning and installation of the guide and seal, and at the same time facilitates the coaxiality of the guide structure 4 and the sealing structure 6, so that the overall guiding and sealing effect between them and the floating metering rod 3 is better.

[0087] The specific structure of the sealing structure 6 and the connecting seat 5 depends on the actual application conditions. For cases where lubrication of the seal and isolation of materials from air are required, the sealing structure 6 includes a normal pressure sealing ring 61 and a pressure-bearing sealing ring arranged axially along the connecting seat 5. The normal pressure sealing ring 61 is located between the guide structure 4 and the pressure-bearing sealing ring. The connecting seat 5 between the normal pressure sealing ring 61 and the pressure-bearing sealing ring has multiple through holes 51 in the middle. The through holes 51 connect the outer side of the outer wall of the metering rod 3 with the inner wall of the limiting cavity to form an isolation medium cavity, which stores the isolation medium.

[0088] The base 9 is provided with a supply port 91, which is connected to the medium isolation chamber. A transparent tube 92 is installed at the supply port 91. The transparent tube 92 is located outside the base 9 and is used to store the isolation medium.

[0089] When the material to be metered is glue, the isolation medium is a plasticizer, which is located between the air and the glue to prevent the glue from seeping into the pressure-bearing sealing ring and the metering rod 3 and solidifying upon contact with the air, thus affecting the sealing effect. At the same time, the plasticizer has a lubricating effect, and the glue leakage can also be observed by the color of the plasticizer inside the transparent tube 92.

[0090] To ensure a good seal, the pressure-bearing seal ring is a combination seal, consisting of an outer sealing ring 63 and an inner sealing ring 62. The combination of multiple seals improves the sealing effect of the pressure-bearing seal ring.

[0091] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. A cylinder body for a metering device, characterized in that: The cylinder (8) is used to store the material to be metered and output, and the cylinder (8) includes: The main body (80) is a tubular structure. One end of the main body (80) is the feed end and is provided with a first connection port (801), and the other end is the discharge end and is provided with a discharge port (82). The middle part of the main body (80) is a storage chamber (83). The metering rod (3) of the metering device extends into the storage chamber (83) from the first connection port (801) and slides and seals with the first connection port (801). The material in the storage chamber (83) is conveyed to the discharge port (82) through linear motion. There is a circumferential gap between the side wall of the metering rod (3) and the side wall of the storage chamber (83). The cross-section of the metering rod (3) is circular. The feed inlet (81) is located on the outer wall of the body (80) at the feed end; The feeding channel (84) is located on the side wall of the body (80) at the feeding end, connecting the feeding port (81) with the storage cavity (83). The axis of the feeding channel (84) is offset relative to the axis of the metering rod (3).

2. The cylinder body for a metering device as described in claim 1, characterized in that: The projection of the outlet of the feed channel (84) onto the outer wall of the metering rod (3) is offset from the center of the metering rod (3).

3. The cylinder body for a metering device as described in claim 1, characterized in that: The feed inlet (81) corresponds to the axis of the metering rod (3), and the feed channel (84) is inclined toward one side wall of the metering rod (3).

4. The cylinder body for a metering device as described in claim 1, characterized in that: The circumferential gap is annular, and the fluid flow direction at the point furthest from the feed inlet (81) on the intersection line of the feed channel (84) and the side wall of the storage cavity (83) is tangent to the side wall of the storage cavity (83).

5. The cylinder body for a metering device as described in claim 1, characterized in that: The cross-sectional dimensions of the feed channel (84) include a cross-sectional width (W) and a cross-sectional length (L). The cross-sectional length (L) is consistent with the axial direction of the body (80), and the cross-sectional width (W) is consistent with the radial direction of the body (80). The cross-sectional width (W) gradually decreases along the material flow direction, and the cross-sectional length (L) gradually increases along the material flow direction.

6. The cylinder body for a metering device as described in claim 5, characterized in that: The material flowing out of the feed channel (84) is tangent to the outer wall of the metering rod (3).

7. A measuring device, characterized in that: Includes the cylinder body for the metering device as described in any one of claims 1-6.

8. The metering device as described in claim 7, characterized in that: The measuring rod (3) is driven by the linear drive mechanism (1) to reciprocate along a straight line. The measuring device also includes a floating connection structure (2), which floats the measuring rod (3) and the moving end (14) of the linear drive mechanism (1). A guide structure (4) that slides with the measuring rod (3) is installed at the first connection port (801), and the guide structure (4) is sleeve-shaped.

9. The measuring device as described in claim 8, characterized in that: The ratio of the length of the guide structure (4) to the diameter of the measuring rod (3) is 0.4-2.

10. The metering device as described in claim 8, characterized in that: The floating connection structure (2) includes a limiting ring (21) fixedly installed on the moving end (14). The limiting ring (21) is provided with an annular groove (211) that cooperates with the annular boss (31). The annular boss (31) is limited between the annular groove (211) and the moving end (14). There is a first gap between the annular boss (31) and the annular groove (211) along the axial direction of the measuring rod (3). There is a second gap between the annular boss (31) and the annular groove (211) along the radial direction of the measuring rod (3). The first gap and the second gap enable the measuring rod (3) to float and connect with the moving end (14). During the process of material entering the cylinder (8) from the feed port (81) and being discharged from the discharge port (82), the annular boss (31) contacts the moving end (14) under the action of the material pressure inside the cylinder (8).

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