Filling piston capable of sensing liquid level

Abstract

The filling piston capable of sensing the liquid level comprises a piston cylinder, limiting rings are arranged at the upper end and the lower end of the piston cylinder, and a lifting device drives the piston to move between the limiting rings of the piston cylinder through a piston rod fixed to the lower end of the lifting device; a magnetic induction type proximity switch is arranged at one position of each limiting ring, the upper surface and the lower surface of the piston are each provided with a permanent magnet in an embedded mode, and the permanent magnets trigger the magnetic induction type proximity switches when the piston makes contact with the limiting rings. When the piston is located at the upper end and the lower end of the piston cylinder, different magnetic induction type proximity switches can be triggered, and the magnetic induction type proximity switches send electric signals to the PLC to feed back the position of the piston. According to the automatic filling device, the PLC can conveniently send out corresponding control signals to related filling valves according to the positions of the pistons so as to achieve automatic filling, complex program setting is not needed, the structure is simple, and the universality is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of chemical production equipment, and in particular to a piston capable of sensing liquid level for filling. BACKGROUND

[0002] After the processing and production of liquid chemical products are completed, filling is required. Patent No. CN202122243884.1 proposes a servo piston pump filling device that can be used for filling liquid chemical products. The servo motor is used to drive the filling, and the purpose is to set the speed and stroke of the servo motor on the control panel to arbitrarily adjust the filling amount and filling speed, and to improve the filling precision and filling speed. This is an improvement direction of the filling device. SUMMARY

[0003] The present application proposes another improvement direction to realize the interaction between different piston positions and control systems. The present application proposes a piston capable of sensing liquid level for filling, which comprises: a piston cylinder, a limiting ring is arranged at the upper and lower ends of the piston cylinder, a lifting device drives the piston to move between the limiting rings of the piston cylinder through the piston rod fixed at the lower end; a magnetic induction type proximity switch is arranged at one position of each limiting ring, a permanent magnet is embedded on the upper and lower surfaces of the piston, and the permanent magnet triggers the magnetic induction type proximity switch when the piston contacts the limiting ring; the magnetic induction type proximity switches are electrically connected to the PLC controller.

[0004] Preferably, the lifting device is a pneumatic cylinder, a hydraulic cylinder or a linear motor.

[0005] Preferably, the orthographic projection of the magnetic induction type proximity switch above coincides with the magnetic induction type proximity switch below.

[0006] Preferably, the orthographic projection of the permanent magnet above coincides with the permanent magnet below.

[0007] Preferably, the lower surface of the piston is provided with an anti-corrosion layer.

[0008] When the piston is at the upper and lower ends of the piston cylinder, different magnetic induction type proximity switches are triggered, and the magnetic induction type proximity switches send electrical signals to the PLC controller to feedback the position of the piston. The PLC controller can send corresponding control signals to the valves related to filling to realize automatic filling according to the position of the piston. The present application does not require complex program setting, has a simple structure, and has good universality. BRIEF DESCRIPTION OF DRAWINGS

[0009] Fig. 1 It is a front view of the present application.

[0010] Fig. 2 It is a perspective view of the present application.

[0011] 3, piston assembly; 31, piston cylinder; 32, piston; 33, lifting device; 311, magnetic induction proximity switch; 312, magnetic induction proximity switch; 313, limit ring; 321, permanent magnet. DETAILED DESCRIPTION EMBODIMENT 1

[0012] As Figs. 1-2 shown, the filling piston 3 capable of sensing liquid level comprises a piston cylinder 31, a lower limit ring 313 and an upper limit ring 313 arranged at the lower and upper ends of the piston cylinder 31 respectively, a lifting device 33, a piston 32, and a magnetic induction proximity switch 312 and a magnetic induction proximity switch 311 arranged at the lower and upper limit rings 313 respectively, and a permanent magnet 321 embedded in the upper and lower surfaces of the piston 32.

[0013] More specifically, the lifting device 33 is a pneumatic cylinder, a hydraulic cylinder or a linear motor.

[0014] More specifically, the upper magnetic induction proximity switch is in the same position as the lower magnetic induction proximity switch.

[0015] More specifically, the upper permanent magnet 321 is in the same position as the lower permanent magnet 321.

[0016] More specifically, the lower surface of the piston 32 is provided with an anti-corrosion layer to prevent corrosion of the liquid chemical product.

[0017] When the piston is at the upper and lower ends of the piston cylinder, different magnetic induction proximity switches are triggered, and the magnetic induction proximity switches send electrical signals to the PLC controller to feedback the position of the piston, so that the PLC controller sends corresponding control signals to the related valves for filling to realize automatic filling.

[0018] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A liquid level sensing filling piston, characterized by: The piston cylinder is provided with a limiting ring at its upper and lower ends, and a lifting device drives the piston to move between the limiting rings through a piston rod fixed at the lower end of the lifting device; a magnetic induction proximity switch is arranged at a position of each limiting ring, and a permanent magnet is embedded on the upper and lower surfaces of the piston, and the permanent magnet triggers the magnetic induction proximity switch when the piston contacts the limiting ring. The magnetic induction proximity switches are electrically connected with a PLC controller. The lifting device is a pneumatic cylinder, a hydraulic cylinder or a linear motor.

2. The liquid level sensing filling piston of claim 1, wherein: The orthographic projection of the magnetic induction proximity switch on the upper side coincides with the magnetic induction proximity switch on the lower side.

3. The liquid level sensing filling piston of claim 2, wherein: The orthographic projection of the permanent magnet on the upper side coincides with the permanent magnet on the lower side.

4. The liquid level sensing filling piston of claim 3, wherein: The lower surface of the piston is provided with an anti-corrosion layer.

5. The liquid level sensing filling piston of claim 4, wherein: ​

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