Metering pump capable of continuously and quantitatively discharging glue with high precision

Abstract

The invention discloses a high-precision continuous quantitative glue discharge metering pump, which comprises a cylinder body, a metering rod, a pump body, a pump body and a pump body, and is characterized in that the cylinder body is internally provided with the metering rod; the switch valve is fixedly mounted on the cylinder body; wherein an inlet and an outlet are formed in the cylinder body, the switch valve comprises a switch valve air cylinder, a switch valve piston rod and an electromagnetic valve assembly, the switch valve piston rod is arranged in the switch valve air cylinder, a plugging part is arranged at the bottom of the switch valve piston rod, a lower channel is formed between the plugging part and the inlet, and an upper channel is formed between the plugging part and the outlet; the electromagnetic valve assembly is fixedly installed on the switch valve air cylinder. Compared with the prior art, the influence of pressure difference fluctuation of an inlet of an existing metering pump on positioning glue discharging is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of fluid transportation, and in particular to a metering pump capable of continuously and quantitatively discharging glue with high precision. Background Art

[0002] The metering pump is the most important product in the glue coating machine. The flow rate and quantitative accuracy directly affect the glue coating amount and final performance of the product.

[0003] In the prior art of metering pumps, two sets of mechanical one-way valves are used to control the opening and closing of the metering pump inlet and outlet. The metering inlet and outlet one-way valves are opened or closed as the internal pressure of the metering pump body changes, so as to achieve continuous metering of glue.

[0004] Mechanical one-way valves are passively opened or closed, and a certain pressure difference needs to be established between the inlet and outlet of the metering pump to achieve metering accuracy; and the inlet of the metering pump needs to maintain a stable pressure value. Therefore, it is necessary to add a fluid pressure stabilizing device to eliminate the pressure fluctuation caused by the reversal of the feed pump, which increases the cost and the risk factor accordingly.

[0005] Since the inlet and outlet of the metering pump need to establish a certain pressure multiple relationship, the overall ability of the metering pump to discharge glue will be limited, such as the discharge flow range, the pressure of the metering pump and other parameters. Summary of the invention

[0006] The purpose of the present invention is to provide a metering pump for continuous and quantitative glue discharging with high precision, so as to solve the influence of the inlet pressure difference fluctuation of the existing metering pump on the positioning glue discharging.

[0007] In order to achieve the above object, the present invention adopts the following technical scheme: a metering pump for high-precision continuous quantitative dispensing of glue, comprising:

[0008] A cylinder body, inside which a metering rod is arranged;

[0009] A switch valve, which is fixedly mounted on the cylinder body;

[0010] Among them, an inlet and an outlet are arranged on the cylinder body, the switch valve includes a switch valve cylinder, a switch valve piston rod and a solenoid valve assembly, the switch valve piston rod is arranged in the switch valve cylinder, a sealing part is arranged at the bottom of the switch valve piston rod, a lower channel is arranged between the sealing part and the inlet, an upper channel is arranged between the sealing part and the outlet, and the solenoid valve assembly is fixedly mounted on the switch valve cylinder.

[0011] As a further description of the above technical solution:

[0012] The metering rod is a ceramic rod.

[0013] As a further description of the above technical solution:

[0014] The cylinder body is a ceramic cylinder.

[0015] As a further description of the above technical solution:

[0016] An observation window is arranged on the switch valve cylinder.

[0017] As a further description of the above technical solution:

[0018] The switch valve cylinder is also provided with an oil filling port.

[0019] As a further description of the above technical solution:

[0020] The switch valve is a patch type high-speed valve.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0022] 1. In the present invention, a group of active switch valves is used to replace two groups of passive one-way valves, so as to realize the interlocking of the inlet and outlet valves, thereby realizing high-precision continuous metering, simplifying the structure of the metering pump, reducing the impact of pressure fluctuations, and improving the overall capacity of the metering pump. It can realize high pressure resistance, high precision, and wide flow range operation, while reducing the use and maintenance costs of metering.

[0023] 2. In the present invention, the switch valve provides sufficient power to achieve good sealing, reduce the accuracy impact caused by the pressure difference fluctuation between the inlet and outlet of the metering pump, and can achieve operation in a wide flow range while improving the glue discharging accuracy. The rapid response of the inlet and outlet valves improves the glue discharging accuracy of the metering pump.

[0024] 3. In the present invention, the elimination of the voltage stabilizing device can reduce the use cost, while reducing the overall maintenance cost and failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a three-dimensional diagram of a metering pump that continuously and quantitatively discharges glue with high precision.

[0027] Figure 2 The diagram is a schematic diagram of the left stroke operation of a metering pump for high-precision continuous quantitative glue dispensing.

[0028] Figure 3 The diagram is a schematic diagram of the right stroke operation of a metering pump for high-precision continuous quantitative glue dispensing.

[0029] Legend:

[0030] 1. Cylinder body; 11. Inlet; 12. Outlet; 13. Lower channel; 14. Upper channel; 2. Switch valve cylinder; 21. Switch valve piston rod; 211. Sealing part; 22. Observation window; 23. Oil filling port; 3. Solenoid valve assembly; 9. Metering rod. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Example 1

[0033] See also Figure 1-3 The present invention provides a technical solution: a metering pump for high-precision continuous quantitative dispensing of glue, comprising:

[0034] A cylinder body 1, inside which a metering rod 9 is arranged;

[0035] A switch valve, which is fixedly mounted on the cylinder body 1;

[0036] Among them, the cylinder body 1 is provided with an inlet 11 and an outlet 12, the switch valve includes a switch valve cylinder 2, a switch valve piston rod 21 and a solenoid valve assembly 3, the switch valve piston rod 21 is arranged in the switch valve cylinder 2, and a sealing portion 211 is arranged at the bottom of the switch valve piston rod 21, a lower channel 13 is arranged between the sealing portion 211 and the inlet 11, and an upper channel 14 is arranged between the sealing portion 211 and the outlet 12, and the solenoid valve assembly 3 is fixedly installed on the switch valve cylinder 2.

[0037] The metering pump uses a double piston cylinder to increase power, increase sealing pressure, improve sealing, reduce the impact of the pressure difference fluctuation at the metering pump inlet, eliminate the use of a pressure stabilizing device, and increase the flow range and pressure range of the equipment. The rapid response of the outlet valve improves the glue output accuracy of the metering pump. The metering pump has a modular design, a compact structure, small space, and reduces costs.

[0038] The switch valve is a patch-type high-speed valve. The use of a patch-type high-speed valve improves the rapid response capability and quantitative accuracy of the valve.

[0039] The working principle of the metering pump is as follows.

[0040] Left stroke:

[0041] The switch valve piston rod 21 moves downward, and the blocking part 211 moves downward accordingly, the upper channel 14 opens, and the lower channel 13 closes. At the same time, the metering rod 9 moves to the left. The volume of the metering rod 9 is half of the volume of the cylinder body 1. 50% of the glue is pumped out through the outlet 12, and 50% of the glue flows into the right side of the metering rod piston through the inlet 11.

[0042] Right stroke:

[0043] The switch valve piston rod 21 moves upward, and the blocking part 211 moves upward accordingly, the upper channel 14 is closed, and the lower channel 13 is opened. At the same time, the metering rod 9 moves to the right. The volume of the metering rod 9 is half of the volume of the cylinder body 1. 50% of the glue on the right side of the metering rod piston is pumped out from the outlet 12, and 100% of the glue is replenished from the inlet 11 on the left side of the metering rod piston.

[0044] By replacing two sets of passive one-way valves with a set of active switching valves, the interlocking of the inlet and outlet valves is achieved, thereby realizing high-precision continuous metering, simplifying the metering pump structure, reducing the impact of pressure fluctuations, and improving the overall capacity of the metering pump. It can achieve high pressure resistance, high precision, and wide flow range operation, while reducing the use and maintenance costs of metering.

[0045] The switch valve provides sufficient power to achieve a good seal, reduce the accuracy impact caused by the pressure difference fluctuation between the inlet and outlet of the metering pump, and achieve wide flow range operation while improving the glue discharging accuracy. The rapid response of the inlet and outlet valves improves the glue discharging accuracy of the metering pump. The elimination of the pressure stabilizing device can reduce the cost of use, while reducing the overall maintenance cost and failure rate.

[0046] Example 2

[0047] This embodiment further provides the following improved technical solutions based on the above embodiments: the metering rod 9 is a ceramic rod, and the cylinder body 1 is a ceramic cylinder.

[0048] The metering pump adopts highly wear-resistant non-metallic seals, highly wear-resistant ceramic rods and ceramic cylinders to increase the overall service life of the product.

[0049] Example 3

[0050] Based on the above embodiments, this embodiment further makes the following improved technical solutions: an observation window 22 is provided on the switch valve cylinder 2 to monitor the lubricating oil inside the switch valve cylinder 2, reduce the risk of fluid leakage, facilitate inspection and maintenance, and ensure smooth movement of the switch valve piston rod 21.

[0051] Example 4

[0052] This embodiment further provides the following improved technical solutions based on the above embodiment: an oil filling port 23 is further provided on the switch valve cylinder 2. Based on the observation window 22, lubricating oil is replenished in time.

[0053] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-precision, continuous and quantitative metering pump for discharging glue, characterized in that: include: A cylinder body, inside which a metering rod is arranged; A switch valve, which is fixedly mounted on the cylinder body; In which, the cylinder body is provided with an inlet and an outlet, the switch valve includes a switch valve cylinder, a switch valve piston rod and a solenoid valve assembly, the switch valve piston rod is arranged in the switch valve cylinder, a blocking portion is arranged at the bottom of the switch valve piston rod, a lower channel is arranged between the blocking portion and the inlet, an upper channel is arranged between the blocking portion and the outlet, and the solenoid valve assembly is fixedly mounted on the switch valve cylinder.

2. A high-precision, continuous and quantitative metering pump for discharging glue according to claim 1, characterized in that: The metering rod is a ceramic rod.

3. A high-precision, continuous and quantitative metering pump for discharging glue according to claim 1, characterized in that: The cylinder body is a ceramic cylinder.

4. A high-precision, continuous and quantitative metering pump for discharging glue according to claim 1, characterized in that: An observation window is arranged on the switch valve cylinder.

5. A high-precision, continuous and quantitative metering pump for discharging glue according to claim 1, characterized in that: The switch valve cylinder is also provided with an oil filling port.

6. A high-precision, continuous and quantitative metering pump for discharging glue according to claim 1, characterized in that: The switch valve is a patch type high-speed valve.

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