A piston metering pump

Abstract

This invention proposes a piston-type metering pump, comprising a pump body block, a discharge block, and a linear actuator. The pump body block contains an inlet channel, a discharge channel, and a piston sleeve. The discharge block is detachably mounted on the discharge end of the pump body block to restrict the piston sleeve. A piston is located at the end of the telescopic push rod of the linear actuator, and a maintenance sealing disc is fitted onto the rod. In the feeding state, the piston reciprocates to achieve metering and conveying. In the maintenance state, after disassembling the discharge block, the telescopic push rod is driven to move the piston to the discharge port, while the maintenance sealing disc blocks the inlet end of the discharge channel. This allows for maintenance or replacement of the piston and piston sleeve without emptying the rubber material in the connected storage tank. This invention enables rapid online maintenance of the piston-type metering pump, significantly improving maintenance convenience and work efficiency.

Description

Technical Field

[0001] This invention relates to the field of rubber metering and conveying equipment, and in particular to a piston metering pump. Background Technology

[0002] In the field of metering, pouring, and potting insulating adhesives, piston metering pumps are commonly used for metering and conveying the adhesive. The piston and piston sleeve, which are in direct contact with the adhesive and undergo reciprocating motion, are the core vulnerable components of this device and require regular maintenance or replacement. Currently, widely used piston metering pumps generally suffer from the following drawbacks: 1. Inconvenient maintenance: When it is necessary to replace the piston or piston sleeve, the rubber material in the connected storage tank must be completely emptied first. Otherwise, a large amount of rubber material will leak during the disassembly process, resulting in cumbersome operation, waste of rubber material and environmental pollution. 2. Dynamic seals are prone to damage: The reciprocating motion of the piston rod relies on dynamic seals for sealing. Because the piston rod adheres to adhesive material during its movement, this material is carried into the dynamic seal area, accelerating the wear and aging of the dynamic seals, leading to seal failure, frequent leaks, and high maintenance costs.

[0003] Therefore, there is an urgent need for a piston metering pump that can conveniently and quickly inspect and repair the piston and piston sleeve without emptying the storage tank, and can effectively extend the service life of the piston rod dynamic seal. Summary of the Invention

[0004] To address the shortcomings of existing technologies, such as the need to drain the rubber material during maintenance and rapid wear of dynamic seals, this invention proposes a novel piston metering pump that is easy to maintain online and has a long seal life.

[0005] A piston metering pump includes a pump body block, a discharge block, and a linear actuator.

[0006] The pump body has a coaxial and interconnected feed channel and discharge channel. The other end of the feed channel is an insertion port, and a filling port is located around the periphery of the feed channel. A piston sleeve is installed inside the discharge channel, the outer diameter of which is equal to the inner diameter of the discharge channel, and the piston sleeve extends to the discharge port of the discharge channel.

[0007] The discharge block is installed at the discharge end of the pump body block and has a discharge channel connected to the discharge port. The inner diameter of the inlet end of the discharge channel is smaller than that of the discharge port, and the piston sleeve is confined within the discharge channel.

[0008] The linear actuator is installed at the feed end of the pump body block and includes a telescopic push rod, a piston, and a maintenance sealing disc. The telescopic push rod extends into the feed channel through an insertion port and has the flexibility to reciprocate within the feed and discharge channels. The piston is sleeved on the end of the telescopic push rod and locked by a locking nut at the end of the telescopic push rod. The maintenance sealing disc is sleeved on the telescopic push rod.

[0009] In the feeding state, the telescopic push rod drives the piston to move, opening the feed end of the piston sleeve, while the maintenance sealing plate moves away from the feed end of the discharge channel. In the maintenance state, the discharge block is removed to release the restriction on the piston sleeve. The telescopic push rod drives the piston to move to the discharge port of the discharge channel, while the maintenance sealing plate approaches and blocks the feed end of the discharge channel. At this time, the management personnel can perform maintenance on the piston and piston sleeve without first emptying the rubber material in the storage tank.

[0010] This invention achieves convenient maintenance of metering pumps through the ingenious combination of a detachable discharge block and a movable maintenance sealing disc. During maintenance, simply remove the discharge block, push the piston assembly to the discharge port, and use the maintenance sealing disc to block the discharge of the pump body block, thus forming a relatively closed maintenance space. This effectively prevents the rubber material in the storage tank from continuing to flow in, so that the piston and piston sleeve can be maintained or replaced without emptying the rubber material, greatly improving the convenience of operation and work efficiency.

[0011] Furthermore, the linear actuator also includes an upper piston sleeve and a lower piston pressing sleeve. The upper piston sleeve, piston, and lower piston pressing sleeve are sequentially installed at the end of the telescopic push rod. The piston is sleeved on the outer periphery of the upper piston sleeve, and the lower piston pressing sleeve presses the piston onto the upper piston sleeve. The locking nut locks the upper piston sleeve, piston, and lower piston pressing sleeve at the end of the telescopic push rod, making the installation and pre-tightening of the piston more reliable and uniform, ensuring the stability of the sealing surface between the piston and the piston sleeve, and improving the accuracy of measurement and the reliability of sealing.

[0012] Furthermore, to improve guidance, the linear actuator also includes a guide sleeve, which is fitted around the outer periphery of the piston lower sleeve, and the outer diameter of the guide sleeve is equal to the inner diameter of the piston sleeve. When the piston reciprocates, it can provide precise radial guidance for the entire piston assembly (especially the telescopic push rod), effectively preventing piston wear and bending deformation of the telescopic push rod, ensuring smooth movement and extending component life.

[0013] Furthermore, in the feeding state, the piston retracts from the piston sleeve, while the guide sleeve remains inside the piston sleeve, thus providing continuous guidance for the piston and telescopic push rod, achieving uninterrupted guidance throughout the entire process, and further enhancing the stability and rigidity of the moving components.

[0014] Furthermore, the guide sleeve and the piston pressing sleeve are respectively provided with a filling groove and a filling through hole. In the feeding state, the feeding channel and the discharging channel are connected through the filling groove and the filling through hole. In the feeding (suction) state, the rubber material can smoothly fill the chamber behind the piston through these holes, ensuring the accurate measurement volume of each discharge.

[0015] Furthermore, the piston metering pump also includes a connecting cylinder, which is installed at the insertion port of the pump body block. The connecting cylinder is coaxial with the feed channel, and the telescopic push rod enters the insertion port through the connecting cylinder. A return port is provided around the periphery of the connecting cylinder, providing a controllable return channel for any small amount of adhesive material that may be carried from the periphery of the telescopic push rod, preventing adhesive material from accumulating outside the pump body.

[0016] Furthermore, the piston-type metering pump also includes a rubber storage tank, which has a rubber outlet and a rubber return port. The rubber storage tank is installed on the side of the pump body block, and the rubber outlet and rubber return port are respectively connected to the filling port and the return port. In this embodiment, the rubber storage tank is integrated, and the storage tank, pump body, and inlet / outlet are directly connected to form a compact metering and conveying unit. This reduces external pipeline connections, lowers the risk of leakage, and allows the returned rubber to be directly returned to the storage tank for recycling.

[0017] Furthermore, the piston metering pump also includes a sealing mounting cylinder and a lubricating oil cup. The sealing mounting cylinder is abutted and coaxially aligned with the end of the connecting cylinder furthest from the pump body. An oil injection hole is provided around the periphery of the sealing mounting cylinder, and the lubricating oil cup is connected via a conduit. Dynamic seals are installed on both sides of the oil injection hole inside the sealing mounting cylinder, and a scraper ring is installed at the end near the connecting cylinder. The telescopic push rod is inserted into the connecting cylinder through the sealing mounting cylinder. This embodiment is equipped with an independent lubrication and sealing module, which centrally mounts the scraper ring and two dynamic seals through the sealing mounting cylinder and is equipped with a lubricating oil cup, enabling continuous lubrication of the dynamic sealing area, effectively reducing friction and significantly extending the service life of the dynamic seals.

[0018] Furthermore, the distance from the return port to the scraper ring is greater than the limit stroke of the telescopic push rod's up-and-down movement, so as to ensure that the rod section of the telescopic push rod with the adhesive residue will not contact the dynamic seal inside the sealing installation cylinder, thereby reducing the impact of the adhesive residue on the dynamic seal and extending the service life of the dynamic seal.

[0019] Furthermore, the piston metering pump also includes a connecting flange plate, an electric cylinder support rod, and a floating joint. The connecting flange plate is assembled with the end of the sealing mounting cylinder away from the pump body block via the electric cylinder support rod. The cylinder of the linear actuator is mounted on the connecting flange plate, thereby rigidly connecting the cylinder of the linear actuator to the sealing mounting cylinder. The piston rod of the linear actuator is connected to the telescopic push rod via the floating joint, which can effectively absorb the small alignment error between the linear actuator and the telescopic push rod, prevent jamming, ensure smooth driving, and protect the linear actuator and the push rod.

[0020] As can be seen from the above description of the present invention, the present invention has the following beneficial effects: 1. The present invention, through the combined design of a detachable discharge block and a movable sealing plate for maintenance, eliminates the need to empty the connected rubber storage tank when replacing core wear parts (piston and piston sleeve), greatly simplifying the operation process, avoiding rubber waste, and improving equipment maintenance efficiency. 2. By setting up an independent lubrication and sealing module (sealing installation cylinder, lubricating oil cup) and scraper ring, and limiting the key dimensions (distance from the return port to the scraper ring), this invention effectively isolates the contamination of the dynamic sealing area by the adhesive and provides continuous lubrication, fundamentally solving the problem of rapid wear of the piston rod dynamic seal, and reducing maintenance frequency and cost. Attached Figure Description

[0021] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention.

[0022] in: Figure 1 This is a schematic diagram of the feeding state of a piston metering pump; Figure 2 This is a partial schematic diagram of the feeding state of a piston metering pump; Figure 3 This is a schematic diagram of the maintenance status of a piston metering pump; Figure 4 This is a partial schematic diagram of the maintenance status of a piston metering pump; Figures 1 to 4 The identifiers in the text are: 1-Pump body block; 11-Infeed channel; 12-Discharge channel; 13-Filling port; 14-Piston sleeve; 2-Discharge block; 21-Discharge channel; 3-Linear actuator; 31-Telescopic push rod; 32-Piston assembly; 321-Piston upper gasket; 322-Piston; 323-Piston lower pressure sleeve; 3231-Filling through hole; 324-Guide sleeve; 3241-Filling groove; 325-Locking nut; 33-Maintenance sealing disc; 34-Piston rod; 4-Connecting cylinder; 41-Return port; 5-Glue storage tank; 51-Glue outlet; 52-Glue return port; 6-Sealing mounting cylinder; 61-Oil injection hole; 62-Scraper ring; 63-First dynamic seal; 64-Second dynamic seal; 7-Lubricating oil cup; 8-Connecting flange plate; 9-Electric cylinder support rod; 10-Floating joint. Detailed Implementation

[0023] To make the technical problems, technical solutions, and beneficial effects of this invention clearer and more understandable, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0024] Please see Figures 1 to 4 A piston-type metering pump, with a vertically installed structure, includes a drive and sealing assembly, a pump body assembly, and a discharge assembly arranged sequentially from top to bottom. Specifically, the piston-type metering pump includes a pump body block 1, a discharge block 2, a linear actuator 3, a connecting cylinder 4, a rubber storage tank 5, a sealing mounting cylinder 6, a lubricating oil cup 7, a connecting flange plate 8, an electric cylinder support rod 9, and a floating joint 10. The pump body block 1 has a coaxial feed channel 11 and a discharge channel 12 that are connected vertically. The upper end of the feed channel 11 is an insertion port, and its side wall has a filling port 13. A piston sleeve 14 is tightly fitted inside the discharge channel 12, and the lower end of the piston sleeve 14 extends to the discharge port at the bottom of the discharge channel 12.

[0025] The discharge block 2 is installed at the bottom (discharge end) of the pump body block 1 by bolts or quick-release buckles. The upper inner diameter of its discharge channel 21 is slightly smaller than the discharge port, thereby pressing the piston sleeve 14 from below and confining it within the discharge channel 12 to prevent it from moving axially and detaching.

[0026] The connecting cylinder 4 is installed at the insertion port at the upper end of the pump body block 1, and its side wall has a return port 41. The adhesive storage tank 5 is installed on the side of the pump body block 1, and its outlet 51 and return port 52 are respectively connected to the filling port 13 of the pump body block 1 and the return port 41 of the connecting cylinder 4.

[0027] The sealing mounting cylinder 6 is inserted into the upper end of the connecting cylinder 4. The side wall of the sealing mounting cylinder 6 has an oil injection hole 61, which is connected to a lubricating oil cup 7 via a conduit. Inside the sealing mounting cylinder 6, a scraper ring 62, a first dynamic seal 63, and a second dynamic seal 64 are installed sequentially from bottom to top. The oil injection hole 61 is located between the two dynamic seals and can be used to inject grease.

[0028] The connecting flange plate 8 is fixedly connected to the upper end of the sealing mounting cylinder 6 via multiple vertical electric cylinder support rods 9. The cylinder body of the linear actuator 3 (which can be a hydraulic cylinder or an electric cylinder) is inverted or vertically fixed above the connecting flange plate 8. The piston rod 34 of the linear actuator 3 extends downward and is connected to the upper end of the telescopic push rod 31 via a floating joint 10. The telescopic push rod 31 passes through the sealing mounting cylinder 6 and the connecting cylinder 4 from top to bottom, and finally extends into the feed channel 11 of the pump body block 1.

[0029] The lower end of the telescopic push rod 31 is sequentially fitted with an upper piston sleeve 321, a piston 322, and a lower piston sleeve 323, and locked with a locking nut 325. A guide sleeve 324 is also fitted around the outer periphery of the lower piston sleeve 323. The upper piston sleeve 321, piston 322, lower piston sleeve 323, and guide sleeve 324 together constitute a piston assembly. The guide sleeve 324 has an axial filling groove 3241, and the lower piston sleeve 323 has a radial filling through hole 3231. The maintenance sealing disc 33 is fitted onto the telescopic push rod 31 and is located above the piston assembly.

[0030] The working principle of the piston metering pump provided by this invention is as follows: Material supply status (e.g.) Figure 1 and Figure 2 As shown): The linear actuator 3 drives the telescopic push rod 31 to reciprocate up and down. When the telescopic push rod 31 moves upward (return stroke), the piston 322 exits upward from the piston sleeve 14. Under pressure or its own weight, the rubber material enters the feed channel 11 from the rubber material storage tank 5 through the filling port 13, and then enters the chamber at the lower end of the piston sleeve 14 (i.e., the upper part of the discharge channel 12) through the filling through hole 3231 and the filling groove hole 3241. When the telescopic push rod 31 moves downward (progress stroke), the piston 322 enters the piston sleeve 14 and blocks its lower end, pushing the rubber material in the chamber downward through the discharge channel 21 of the discharge block 2, completing one discharge. In this state, the guide sleeve 324 is always located inside the piston sleeve 14, providing radial guidance, while the maintenance sealing disc 33 is located above, away from the pump body block 1. In addition, the axial distance L from the return port 41 to the scraper ring 62 is greater than the vertical stroke S of the telescopic push rod 31, ensuring that the rod segment with adhesive material does not move up to the height of the contact dynamic seal during its entire stroke.

[0031] Maintenance status (e.g.) Figure 3 and Figure 4 (As shown): When it is necessary to replace the piston 322 or piston sleeve 14, firstly, control the linear actuator 3 to drive the telescopic push rod 31 to move downwards until the piston 322 is pushed to the original discharge port (i.e., the lowest end of the piston sleeve 14). At this time, the maintenance sealing disc 33 moves downwards under the drive of the telescopic push rod 31 and fits tightly against the upper end face (feed end) of the discharge channel 12, forming an effective blockage. Then, remove the bottom discharge block 2, the axial restriction of the piston sleeve 14 is released, and the feed end of the pump body block 1 is blocked from the top by the maintenance sealing disc 33. The rubber in the rubber storage tank 5 will not leak from the filling port 13. Maintenance personnel can then easily remove the piston sleeve 14 and / or piston assembly from the bottom of the pump body for maintenance or replacement. After completion, reassemble in reverse order to restore use.

[0032] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0036] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0037] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A piston metering pump characterized in that, Includes pump body block, discharge block and linear actuator; The pump body block is provided with a coaxial and connected feed channel and a discharge channel; the other end of the feed channel is an insertion port, and the periphery of the feed channel is provided with a filling port; the discharge channel is provided with a piston sleeve, the outer diameter of the piston sleeve is equal to the inner diameter of the discharge channel, and the piston sleeve extends to the discharge port of the discharge channel. The discharge block is installed at the discharge end of the pump body block and is provided with a discharge channel connected to the discharge port. The inner diameter of the inlet end of the discharge channel is smaller than that of the discharge port, and the piston sleeve is confined within the discharge channel. The linear actuator is installed at the feed end of the pump body block and includes a telescopic push rod, a piston, and a maintenance sealing disc. The telescopic push rod extends into the feed channel through an insertion port and has the flexibility to reciprocate within the feed channel and discharge channel. The piston is sleeved on the end of the telescopic push rod and locked by a locking nut at the end of the telescopic push rod. The maintenance sealing disc is sleeved on the telescopic push rod. In the feeding state, the telescopic push rod drives the piston to move, thereby opening the feed end of the piston sleeve, while the maintenance sealing plate moves away from the feed end of the discharge channel; in the maintenance state, the discharge block is disassembled to release the restriction on the piston sleeve, the telescopic push rod drives the piston to move to the discharge port of the discharge channel, while the maintenance sealing plate approaches and blocks the feed end of the discharge channel.

2. A piston metering pump according to claim 1, characterized in that The linear actuator also includes an upper piston sleeve and a lower piston sleeve. The upper piston sleeve, piston, and lower piston sleeve are sequentially installed at the end of the telescopic push rod. The piston is sleeved on the outer periphery of the upper piston sleeve. The lower piston sleeve presses the piston onto the upper piston sleeve. The locking nut locks the upper piston sleeve, piston, and lower piston sleeve at the end of the telescopic push rod.

3. A piston metering pump according to claim 2, characterized in that, The linear actuator also includes a guide sleeve, which is fitted around the outer periphery of the piston lowering sleeve, and the outer diameter of the guide sleeve is equal to the inner diameter of the piston sleeve.

4. A piston metering pump according to claim 3, characterized in that, In the feeding state, the piston retracts from the piston sleeve, while the guide sleeve remains inside the piston sleeve.

5. A piston metering pump according to claim 4, characterized in that, The guide sleeve and the piston pressing sleeve are respectively provided with a filling groove and a filling through hole, and in the feeding state, the feeding channel and the discharging channel are connected through the filling groove and the filling through hole.

6. A piston metering pump according to claim 1, characterized in that, The piston metering pump also includes a connecting cylinder, which is installed at the insertion port of the pump body block. The connecting cylinder is coaxial with the feed channel, and the telescopic push rod enters the insertion port through the connecting cylinder. A return port is provided around the periphery of the connecting cylinder.

7. A piston metering pump according to claim 6, characterized in that, The piston metering pump also includes a rubber storage tank, which has a rubber outlet and a rubber return port. The rubber storage tank is installed on the side of the pump body block, and the rubber outlet and the rubber return port are respectively connected to the filling port and the return port.

8. A piston metering pump according to claim 7, characterized in that, The piston metering pump also includes a sealing mounting cylinder and a lubricating oil cup; the sealing mounting cylinder is connected to the end of the connecting cylinder away from the pump body block and is coaxial; the periphery of the sealing mounting cylinder is provided with an oil injection hole and is connected to the lubricating oil cup through a conduit; inside the sealing mounting cylinder, dynamic seals are installed on both sides of the oil injection hole, and a scraper ring is installed at the end near the connecting cylinder; the telescopic push rod is inserted into the connecting cylinder through the sealing mounting cylinder.

9. A piston metering pump according to claim 8, characterized in that, The distance from the return port to the scraper ring is greater than the limit stroke of the telescopic push rod's up-and-down movement.

10. A piston metering pump according to claim 8, characterized in that, The piston metering pump also includes a connecting flange plate, an electric cylinder support rod, and a floating joint. The connecting flange plate is assembled with the end of the sealing mounting cylinder away from the pump body block via the electric cylinder support rod. The cylinder of the linear actuator is mounted on the connecting flange plate, and the piston rod of the linear actuator is connected to the telescopic push rod via the floating joint.

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