CN209925159U

CN209925159U - Liquid servo metering pump

Info

Publication number: CN209925159U
Application number: CN201920753981.5U
Authority: CN
Inventors: 洪振宇; 曹献英; 王建飞
Original assignee: CANGZHOU EIAHE MACHINERY Co Ltd
Current assignee: CANGZHOU EIAHE MACHINERY Co Ltd
Priority date: 2019-05-24
Filing date: 2019-05-24
Publication date: 2020-01-10
Anticipated expiration: 2029-05-24

Abstract

The utility model discloses a servo measuring pump of liquid, including the pump case and install the servo motor in the pump case, push rod and lead screw, be connected with a metering cylinder on the pump case, the setting that the push rod can control the removal is in the pump case, the fixed piston that is provided with in right side of push rod, the fixed pump head that is provided with in right side of a metering cylinder, the pump head encloses synthetic liquid with a metering cylinder and piston and holds the chamber, be provided with first check valve and second check valve on the pump head, the lead screw rotates and sets up in the pump case, the left end of lead screw is provided with driven pulleys, the right-hand member of lead screw and the left side spiro union of push rod, the fixed driving pulley that is provided with on servo motor. The utility model discloses a control servo motor's parameter can realize the adjustment of piston extreme position, and then realizes the adjustment of filling liquid volume, and is very convenient to can be accurate control the stroke of piston, can effectual promotion filling liquid's measurement accuracy.

Description

Liquid servo metering pump

Technical Field

The utility model relates to a packagine machine liquid filling technical field especially relates to a servo measuring pump of liquid.

Background

The liquid servo metering pump of the current packaging machine mainly comprises a one-way valve, a pump shell, a piston, a transmission mechanism, a servo motor and a program control system, wherein the servo motor drives the piston to move backwards through the transmission mechanism, so that negative pressure is formed between the piston and the one-way valve, required filling liquid pushes the one-way valve to enter and fill a cavity of the pump shell under the action of pressure, after the piston moves to a set stroke, the filling liquid fills the cavity of the pump shell, namely, the metering volume is met, and then the piston moves forwards under the drive of the servo motor to push the liquid in the cavity of the pump shell out of the servo pump through another one-way valve.

The existing metering pump has the defects of low metering precision, complex structure and the like, and the metering pump needs to be adjusted when changing production, so that the metering pump is relatively troublesome and the production efficiency is influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to avoid prior art's weak point, provide a liquid servo measuring pump to effectively solve the weak point that exists among the prior art.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a liquid servo metering pump comprises a pump shell, a servo motor, a push rod and a lead screw which are arranged in the pump shell, the pump shell is connected with a metering cylinder, the push rod can be arranged in the pump shell in a left-right moving way, the right side of the push rod is fixedly provided with a piston, the piston can be arranged in the metering cylinder in a left-right moving way, the piston is in sealing fit with the inner wall of the metering cylinder, the right side of the metering cylinder is fixedly provided with a pump head, the metering cylinder and the piston enclose a liquid accommodating cavity, the bottom of the pump head is provided with a first one-way valve for liquid to flow in, the top of the pump head is provided with a second one-way valve for liquid to flow out, the screw rod is rotationally arranged in the pump shell, the left end of the screw rod is provided with a driven belt wheel, the right end of the screw rod is in threaded connection with the left side of the push rod, a driving belt wheel is fixedly arranged on an output shaft of the servo motor and is connected with a driven belt wheel through a synchronous belt;

and a circumferential limiting structure is arranged between the push rod and the pump shell.

Further, the pump housing is provided with an exhaust pipe on the left side of the piston.

Furthermore, a guide sliding sleeve is arranged in the pump shell in a matching mode with the push rod.

Furthermore, a rotary supporting sleeve is arranged in the pump shell in a matched mode with the lead screw, and a ball bearing is arranged between the rotary supporting sleeve and the lead screw.

Further, circumference limit structure is including setting up gyro wheel on the push rod and setting up the spacing spout on the pump case, and spacing spout sets up along the axial of push rod.

Furthermore, an access panel is detachably arranged on the pump shell corresponding to the servo motor.

Further, the access panel is connected with the pump shell through screws.

Further, a shock pad is arranged between the servo motor and the pump shell.

Further, the first check valve comprises a first valve seat, a first compression spring and a first valve core, the first valve core is movably arranged on the pump head up and down, the first compression spring is arranged between the pump head and the first valve core, the first valve seat is fixedly connected with the pump head, and the valve plate at the bottom of the first valve core is abutted against the top of the first valve seat.

Further, the second one-way valve comprises a second valve seat, a second compression spring and a second valve core, the second valve core is movably arranged on the pump head up and down, the second valve seat is fixedly connected with the pump head, the second compression spring is arranged between the second valve core and the second valve seat, and the valve plate at the bottom of the second valve core abuts against the pump head.

The above technical scheme of the utility model following beneficial effect has: the utility model can realize the adjustment of the limit position of the piston by controlling the parameters of the servo motor, further realize the adjustment of the volume of the filling liquid, is very convenient, can accurately control the stroke of the piston, and can effectively improve the metering precision of the filling liquid; furthermore, the utility model discloses still have simple structure, low in manufacturing cost, do benefit to the advantage of maintaining.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention;

fig. 2 is a top view of the circumferential limiting structure according to the embodiment of the present invention;

fig. 3 is a partially enlarged view of a portion a in fig. 1.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1-3, the liquid servo metering pump according to this embodiment includes a pump case 1, a servo motor 2 installed in the pump case 1, a push rod 3 and a lead screw 4, the pump case 1 is connected with a metering cylinder 5, the push rod 3 is installed in the pump case 1 in a manner of moving left and right, a piston 6 is fixedly installed on the right side of the push rod 3, the piston 6 is installed in the metering cylinder 5 in a manner of moving left and right, the piston 6 is in sealing contact with the inner wall of the metering cylinder 5, a pump head 7 is fixedly installed on the right side of the metering cylinder 5, the pump head 7, the metering cylinder 5 and the piston 6 enclose a synthetic liquid accommodating chamber 8, a first check valve 9 for liquid to flow in is installed at the bottom of the pump head 7, a second check valve 10 for liquid to flow out is installed at the top of the pump head 7, the lead screw 4 is rotatably installed in the pump case 1, a driven pulley, a threaded hole is formed in the axis of the push rod 3 in a matched mode with the lead screw 4, a driving belt wheel 12 is fixedly arranged on an output shaft of the servo motor 2, and the driving belt wheel 12 is connected with the driven belt wheel 11 through a synchronous belt 13; a circumferential limiting structure is arranged between the push rod 3 and the pump shell 1.

The utility model discloses a theory of operation does: the servo motor 2 drives the screw rod 4 to rotate, the push rod 3 pushes the piston 6 to move rightwards under the action of the screw rod 4 until the piston 6 moves to the right limit position, air in the liquid containing cavity 8 is discharged from the second one-way valve 9 in the moving process, then the servo motor 2 drives the piston 6 to move leftwards, the liquid containing cavity 8 is in a closed negative pressure state in the moving process, filling liquid enters the liquid containing cavity 8 from the first one-way valve 9 under the action of the difference of internal and external pressure and is filled with the liquid containing cavity 8, after the piston 6 moves to the left limit position, the servo motor rotates reversely to push the piston 6 to the right side, and the liquid is discharged from the second one-way valve 10 to supply quantitative filling liquid.

The utility model can realize the adjustment of the limit position of the piston 6 by controlling the parameter of the servo motor, further realize the adjustment of the volume of the filling liquid, is very convenient, can accurately control the stroke of the piston, and can effectively improve the metering precision of the filling liquid; furthermore, the utility model discloses still have simple structure, low in manufacturing cost, do benefit to the advantage of maintaining.

As to how to specifically adjust the parameters of the servo motor, the present application is a conventional technical means known to those skilled in the art, and the greatest improvement lies in how to realize the connection between the servo motor 2 and the piston 6, so the details are not described.

The pump shell 1 is provided with an exhaust pipe 14 on the left side of the piston 6, and timely exhaust is performed in the process that the piston 6 moves leftwards, so that the internal pressure intensity is prevented from being too high.

The pump case 1 is internally matched with the push rod 3 and is provided with a guide sliding sleeve 15, and the guide sliding sleeve 15 plays a role in supporting and guiding the push rod 3, so that the push rod 3 can move more stably.

The pump shell 1 is internally provided with a rotary support sleeve 16 matched with the screw rod 4, and a ball bearing is arranged between the rotary support sleeve 16 and the screw rod 4, so that the fluency of the screw rod 4 during rotation is improved, the load of a driving element is reduced, and the failure rate is reduced.

The circumferential limiting structure comprises a roller 17 arranged on the push rod 3 and a limiting sliding groove 18 arranged on the pump shell 1, the limiting sliding groove 18 is arranged along the axial direction of the push rod 3, preferably, as shown in fig. 2, the width of the limiting sliding groove 18 is slightly larger than the overall dimension of the roller 17, so that the roller 17 can rotate in the limiting sliding groove 18, the friction force between the push rod 3 and the pump shell 1 is greatly reduced, and the service life of the equipment is prolonged.

Maintenance board 19 is provided with corresponding servo motor 2 detachable on the pump case 1, and maintenance board 19 passes through screw 20 and is connected with pump case 1, maintains servo motor 2 that can be convenient through dismouting maintenance board 19.

A shock pad 21 is arranged between the servo motor 2 and the pump shell 1, so that the noise caused by work is reduced.

The first check valve 9 comprises a first valve seat 9a, a first compression spring 9b and a first valve core 9c, the first valve core 9c is movably arranged on the pump head 7 up and down, the first compression spring 9b is arranged between the pump head 7 and the first valve core 9c, the first valve seat 9a is fixedly connected with the pump head 7, a valve plate at the bottom of the first valve core 9c is abutted against the top of the first valve seat 9a, namely when the external pressure is greater than the pressure in the liquid accommodating cavity 8, the first valve core 9c is pushed to move upwards, and the first compression spring 9b is compressed, so that a gap for the filling liquid to pass through is formed between the first valve core 9c and the first valve seat 9 a.

The second one-way valve 10 includes a second valve seat 10a, a second compression spring 10b and a second valve core 10c, the second valve core 10c is movably disposed on the pump head 7 up and down, the second valve seat 10a is fixedly connected with the pump head 7, the second compression spring 10b is disposed between the second valve core 10c and the second valve seat 10a, and a valve plate at the bottom of the second valve core 10c abuts against the pump head 7, that is, when the pressure in the liquid accommodating chamber 8 is higher than the outside, the second valve core 10c is pushed to move upward, so that a gap for the filling liquid to pass through is formed between the second valve core 10c and the pump head 7.

The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. The utility model provides a servo measuring pump of liquid which characterized in that: the liquid-feeding pump comprises a pump shell, a servo motor, a push rod and a lead screw, wherein the servo motor, the push rod and the lead screw are installed in the pump shell, the pump shell is connected with a metering cylinder, the push rod can move left and right and is arranged in the pump shell, a piston is fixedly arranged on the right side of the push rod and can move left and right and is arranged in the metering cylinder, the piston is in sealing fit with the inner wall of the metering cylinder, a pump head is fixedly arranged on the right side of the metering cylinder, the pump head, the metering cylinder and the piston enclose to form a liquid accommodating cavity, a first one-way valve allowing liquid to flow in is arranged at the bottom of the pump head, a second one-way valve allowing liquid to flow out is arranged at the top of the pump head, the lead screw is rotatably arranged in the pump shell, a driven belt wheel is arranged at the left;

2. A liquid servo dosing pump according to claim 1, wherein: the pump shell is provided with an exhaust pipe on the left side of the piston.

3. A liquid servo dosing pump according to claim 1, wherein: the pump shell is internally provided with a guide sliding sleeve in a matching way with the push rod.

4. A liquid servo dosing pump according to claim 1, wherein: the pump shell is internally provided with a rotary supporting sleeve matched with the screw rod, and a ball bearing is arranged between the rotary supporting sleeve and the screw rod.

5. A liquid servo dosing pump according to claim 1, wherein: the circumferential limiting structure comprises a roller arranged on the push rod and a limiting sliding groove arranged on the pump shell, and the limiting sliding groove is arranged along the axial direction of the push rod.

6. A liquid servo dosing pump according to claim 1, wherein: and the pump shell is detachably provided with an access panel corresponding to the servo motor.

7. A liquid servo dosing pump according to claim 6, wherein: the access panel is connected with the pump shell through screws.

8. A liquid servo dosing pump according to claim 1, wherein: and a damping pad is arranged between the servo motor and the pump shell.

9. A liquid servo dosing pump according to claim 1, wherein: the first check valve comprises a first valve seat, a first compression spring and a first valve core, the first valve core is arranged on the pump head in a vertically movable mode, the first compression spring is arranged between the pump head and the first valve core, the first valve seat is fixedly connected with the pump head, and a valve plate at the bottom of the first valve core is abutted against the top of the first valve seat.

10. A liquid servo dosing pump according to claim 1, wherein: the second one-way valve comprises a second valve seat, a second compression spring and a second valve core, the second valve core is movably arranged on the pump head up and down, the second valve seat is fixedly connected with the pump head, the second compression spring is arranged between the second valve core and the second valve seat, and the valve plate at the bottom of the second valve core is abutted against the pump head.