Plunger type metering device

Abstract

The utility model relates to a plunger type metering device which comprises the components of a linear driving mechanism which comprises a moving end which reciprocates along a straight line; the cylinder body is used for storing materials to be metered and output; the tail end of the metering rod is located in the cylinder body, the periphery of the middle is in sealing sliding fit with the cylinder body, and an annular boss is arranged on the periphery of the head end; the floating connection structure comprises a limiting ring fixedly installed at the moving end, an annular groove matched with the annular boss is formed in the limiting ring, the annular boss is limited between the annular groove and the moving end, a first gap in the axial direction of the metering rod is formed between the annular boss and the annular groove, and the first gap is matched with the annular groove. A second gap in the radial direction of the metering rod is formed between the annular boss and the annular groove, the metering rod is in floating connection with the movable end through the first gap and the second gap, and therefore the service life of the guide structure and the service life of the sealing structure are prolonged.

Description

Technical Field

[0001] This utility model relates to the field of metering device technology, and in particular to a plunger-type metering device. 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 use a linear drive mechanism to move the metering rod within the cylinder, while the metering rod contacts the sealing and guiding structures mounted on the cylinder.

[0003] Because errors are inevitable in the processing and installation of the measuring rod and related components, the guide and sealing structures often become misaligned with the measuring rod. This accelerates the wear of the guide structure and the rapid failure of the sealing structure during the use of the measuring device. Utility Model Content

[0004] In response to the shortcomings of the existing production technology, the applicant provides a plunger-type metering device, thereby extending the service life of the guide structure and the sealing structure.

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

[0006] A plunger-type metering device, comprising,

[0007] A linear drive mechanism, including a moving end that reciprocates along a straight line;

[0008] The cylinder is used to store the material to be metered and output.

[0009] The measuring rod has its end located inside the cylinder body, its middle outer circumference is in a sealing sliding fit with the cylinder body, and its front end outer circumference is provided with an annular boss.

[0010] 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.

[0011] As a further improvement to the above technical solution:

[0012] The cylinder body is provided with a feed inlet and a discharge outlet. During the process of material entering the cylinder body from the feed inlet and being discharged from the discharge outlet, the annular boss contacts the moving end under the action of the material pressure inside the cylinder body.

[0013] The annular groove is circular, the annular boss is circular, and the second gap is located between the outer circumferential surface of the annular boss and the sidewall of the annular groove.

[0014] A first limiting part is provided on the side wall of the annular groove, and a second limiting part corresponding to the first limiting part is provided on the outer peripheral surface of the annular boss. The second limiting part cooperates with the first limiting part to restrict the metering rod from rotating relative to the limiting ring.

[0015] There is a second gap between the first limiting part and the second limiting part.

[0016] The second limiting part is a plane, and the bottom of the annular groove is provided with an insertion hole. The first limiting part is a pin structure, and the first limiting part is inserted into the insertion hole.

[0017] The cylinder body is provided with a first connection port, and a sealing structure is installed in the first connection port. It also includes a guide structure fixed relative to the cylinder body. The guide structure is sleeve-shaped and located between the sealing structure and the moving end.

[0018] The outer periphery of the middle part of the measuring rod is in sliding sealing cooperation with the cylinder body through the sealing structure and the guide structure.

[0019] The ratio of the length of the guide structure to the diameter of the measuring rod is 0.4-2.

[0020] The guide structure is an oil-free metal bushing.

[0021] It also includes a base, the mounting part of the linear drive mechanism is fixedly connected to the base, the base is fixedly connected to the cylinder, the base is provided with a second connection port, the first connection port and the second connection port are both stepped holes, the first connection port and the second connection port are arranged opposite to each other to form a limiting cavity, a tubular connecting seat is sealed and installed in the limiting cavity, and the guide structure and the sealing structure are installed in the connecting seat.

[0022] The beneficial effects of this utility model are as follows:

[0023] This utility model has a compact and reasonable structure and is easy to operate. Through the floating connection structure of the annular boss and the annular groove, the position of the measuring rod can be adaptively moved according to the structure that needs to be coaxially matched. The axial length of the floating connection structure is small. Without increasing the overall size of the plunger-type measuring device, the measuring rod is made coaxial with the guide structure, sealing structure and other structures, thereby extending the service life of the guide structure and the sealing structure.

[0024] This utility model also has the following advantages:

[0025] (1) The first gap and the second gap in the floating connection structure are adapted to ensure that the attitude and axial position of the metering rod relative to the moving end remain unchanged during the discharge process of the metering device, so as to ensure the accuracy of the metering device during use and not affect the discharge amount.

[0026] (2) When the metering rod and the moving end are connected by a floating connection structure, a sleeve-shaped guide structure is adopted. The guide dimension is longer and the guide effect is better. Metal bushings can be used to improve the service life of the guide structure.

[0027] (3) The connecting seat is used as the skeleton for installing the guide structure and the sealing structure, which facilitates the overall assembly and disassembly of the guide structure and the sealing structure, realizes the quick positioning and installation of the guide and the seal, and at the same time facilitates the coaxiality of the guide structure and the sealing structure, so that the overall guiding and sealing effect between it and the floating metering rod is better. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of this utility model.

[0029] Figure 2 This is a partial sectional view of the present invention.

[0030] Figure 3 for Figure 2 Enlarged view of a portion of point A in the middle.

[0031] Figure 4 for Figure 2 Enlarged view of section B in the middle.

[0032] Figure 5 This is a schematic diagram (exploded view) of the structure of this utility model.

[0033] Figure 6 This is a schematic diagram (I) of the assembly structure of the floating connection structure and the annular boss of this utility model.

[0034] Figure 7 This is a schematic diagram (II) of the assembly structure of the floating connection structure and the annular boss of this utility model.

[0035] in:

[0036] 100. Feed valve; 200. Discharge valve;

[0037] 1. Linear drive mechanism; 11. Motor; 12. Lead screw; 13. Lead screw nut; 14. Moving end;

[0038] 2. Floating connection structure; 21. Limiting ring; 211. Annular groove; 212. Insertion hole; 22. First limiting part;

[0039] 3. Measuring rod; 31. Annular boss; 311. Second limiting part;

[0040] 4. Guiding structure;

[0041] 5. Connector; 51. Through hole;

[0042] 6. Sealing structure; 61. Atmospheric pressure sealing ring; 62. Inner sealing ring; 63. Outer sealing ring;

[0043] 8. Cylinder body; 801. First connection port; 81. Feed inlet; 82. Discharge outlet;

[0044] 9. Base; 901. Second connection port; 91. Supply port; 92. Transparent tube; 93. Support. Detailed Implementation

[0045] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0046] Example 1:

[0047] like Figures 1-5 As shown, the plunger-type metering device of this embodiment includes a linear drive mechanism 1, a floating connection structure 2, a cylinder 8, and a metering rod 3.

[0048] The linear drive mechanism 1 includes a moving end 14 that reciprocates along a straight line;

[0049] Cylinder 8 is used to store the material to be metered and output;

[0050] The measuring rod 3 has its end located inside the cylinder 8, and its middle outer circumference is in a sealing sliding fit with the cylinder 8. An annular boss 31 is provided on the outer circumference of its head end.

[0051] The floating connection structure 2 includes a limiting ring 21 fixedly installed on the moving end 14. The limiting ring 21 has 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 be floatingly connected to the moving end 14.

[0052] 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.

[0053] 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.

[0054] 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, and without increasing the overall size of the plunger-type measuring device, the measuring rod 3 is made coaxial with the guide structure 4, sealing structure 6 and other structures, thereby extending the service life of the guide structure 4 and the sealing structure 6.

[0055] The cylinder body 8 is provided with a feed inlet 81 and a discharge outlet 82. During the process of material entering the cylinder body 8 from the feed inlet 81 and being discharged from the discharge outlet 82, the annular boss 31 contacts the moving end 14 under the action of the material pressure inside the cylinder body 8.

[0056] The cylinder body 8 is used to store the material to be metered and output. The feed port 81 on the cylinder body 8 is equipped with a feed valve 100 to control the material entering the cylinder body 8, and the discharge port 82 is equipped with a discharge valve 200 to control the material being discharged from the cylinder body 8.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] Example 2:

[0061] like Figure 6 , Figure 7 As shown, based on Embodiment 1, in this embodiment of the plunger-type metering device, the annular groove 211 is circular, the annular boss 31 is circular, and the second gap is located between the outer circumferential surface of the annular boss 31 and the side wall of the annular groove 211. This gap is sufficient to absorb assembly and machining errors.

[0062] To prevent the annular groove 211 and the annular boss 31 from rotating relative to each other during the use of the plunger-type 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.

[0063] There is a second gap between the first limiting part 22 and the second limiting part 311.

[0064] Both the first limiting part 22 and the second limiting part 311 can be planar, but the first limiting part 22 is difficult to manufacture. To facilitate the molding of the first limiting part 22, it is designed as an independent, detachable part, such as... Figure 6 , Figure 7 As shown, in another embodiment, the second limiting part 311 is a plane, 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.

[0065] Specifically, the number of first limiting parts 22 can be one or more. When there are two first limiting parts 22, they can be set along a diameter direction of the measuring rod 3, and the number and position of the corresponding second limiting parts 311 match the first limiting parts 22.

[0066] Pillar pin structure, such as Figure 7 As shown, it is a cylindrical block structure. The specific cross-section can be circular or a polygon that matches the second limiting part 311. The cross-sectional dimensions can match the cross-section of the socket 212. The socket 212 is a blind hole.

[0067] Example 3:

[0068] like Figure 4 , Figure 5 As shown, based on Embodiment 1, the plunger-type metering device of this embodiment has a first connection port 801 on the cylinder body 8, a sealing structure 6 installed in the first connection port 801, and a guide structure 4 fixed relative to the cylinder body 8. The guide structure 4 is sleeve-shaped and located between the sealing structure 6 and the moving end 14.

[0069] The outer periphery of the middle part of the measuring rod 3 is in sliding sealing cooperation with the cylinder body 8 through the sealing structure 6 and the guide structure 4.

[0070] The ratio of the length of the guide structure 4 to the diameter of the measuring rod 3 is 0.4-2.

[0071] Guide structure 4 is an oil-free metal bushing, specifically made of brass.

[0072] When the measuring rod 3 and the moving end 14 are floatingly connected by the floating connection structure 2, the sleeve-shaped guide structure 4 is adopted. The guide dimension is longer and the guide effect is better. Metal bushings can be used to improve the service life of the guide structure 4.

[0073] Furthermore, such as Figure 4 , Figure 5 As shown, it 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, the base 9 is provided with a second connection port 901, the first connection port 801 and the second connection port 901 are both stepped holes, the first connection port 801 and the second connection port 901 are arranged opposite to form a limiting cavity, a tubular connecting seat 5 is sealed and installed in the limiting cavity, and a guide structure 4 and a sealing structure 6 are installed in the connecting seat 5.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] When the material to be metered and output 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.

[0079] 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.

[0080] 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 plunger-type metering device, characterized in that: include, A linear drive mechanism (1) includes a moving end (14) that reciprocates along a straight line; The cylinder (8) is used to store the material to be metered and output; The measuring rod (3) has its end located inside the cylinder (8), and its middle outer circumference is in a sealed sliding fit with the cylinder (8). An annular boss (31) is provided on the outer circumference of its head. 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).

2. The plunger-type metering device as described in claim 1, characterized in that: The cylinder (8) is provided with a feed inlet (81) and a discharge outlet (82). During the process of material entering the cylinder (8) from the feed inlet (81) and being discharged from the discharge outlet (82), the annular boss (31) contacts the moving end (14) under the action of the material pressure inside the cylinder (8).

3. The plunger-type metering device as described in claim 1, characterized in that: The annular groove (211) is circular, the annular boss (31) is circular, and the second gap is located between the outer peripheral surface of the annular boss (31) and the side wall of the annular groove (211).

4. The plunger-type metering device as described in claim 3, characterized in that: 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 metering rod (3) from rotating relative to the limiting ring (21).

5. The plunger-type metering device as described in claim 4, characterized in that: There is a second gap between the first limiting part (22) and the second limiting part (311).

6. The plunger-type metering device as described in claim 4, characterized in that: 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).

7. The plunger-type metering device as described in claim 1, characterized in that: The cylinder body (8) is provided with a first connection port (801), a sealing structure (6) is installed in the first connection port (801), and a guide structure (4) is fixed relative to the cylinder body (8). The guide structure (4) is sleeve-shaped and located between the sealing structure (6) and the moving end (14). The outer periphery of the middle part of the measuring rod (3) is in sliding sealing cooperation with the cylinder (8) through the sealing structure (6) and the guide structure (4).

8. The plunger-type metering device as described in claim 7, 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.

9. The plunger-type metering device as described in claim 7, characterized in that: The guide structure (4) is an oil-free metal bushing.

10. The plunger-type metering device as described in claim 7, characterized in that: It also includes a seat (9), the mounting part of the linear drive mechanism (1) is fixedly connected to the seat (9), the seat (9) is fixedly connected to the cylinder (8), the seat (9) is provided with a second connection port (901), the first connection port (801) and the second connection port (901) are both 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 in the limiting cavity, and the guide structure (4) and the sealing structure (6) are installed in the connecting seat (5).

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