CN116928054A - Softener circulation system of plunger type servo quantitative machine - Google Patents

Abstract

The invention provides a softener circulation system of a plunger type servo quantitative machine, which is used for realizing automatic filling of a softener, circulating the softener, enabling a plunger to be well lubricated all the time and timely removing leaked sizing materials. The system takes compressed air as power, connects the two-position five-way valve with 24V direct current of the filling valve of the quantitative machine in parallel, and controls the two-position five-way valve to change direction and return by switching the opening and closing of the filling valve. The two-position five-way reversing valve is connected with the air cylinder, the extension and retraction of the air cylinder are controlled, the air cylinder is connected with the liquid extraction cylinder, and the liquid extraction cylinder is connected with the two one-way valves. When the filling valve of the quantitative machine is opened and the two-position five-way valve is reversed, the air cylinder is retracted, the liquid inlet one-way valve is opened, the liquid outlet one-way valve is closed, and the softener enters the liquid extraction cylinder; when the filling valve of the quantitative machine is closed, the reversing valve returns, the air cylinder stretches out, the liquid inlet one-way valve is closed, the liquid outlet one-way valve is opened, the softener in the liquid pumping cylinder is sent into the softener cavity of the quantitative machine, and the old softener returns to the storage box.

Description

Softener circulation system of plunger type servo quantitative machine

Technical Field

The invention relates to the technical field of plunger type quantifying machines, in particular to a softener circulating system of a plunger type servo quantifying machine.

Background

Nowadays, automobile products are developed in the directions of safety, energy conservation, green environmental protection and pollution free, and in the automobile production process, the glue for the automobile body is very important, and the application is very wide. The vehicle body welding glue coating not only can play roles in sealing, shock absorption, rust prevention, sound insulation, heat insulation and noise reduction, but also can replace traditional processes such as spot welding, arc welding and the like, and the connection of sheet metal parts is realized, so that the production process is optimized, and therefore, the precise quantitative equipment is key equipment for glue coating. The quantitative mode of the existing precise quantitative equipment mainly comprises precise gear quantitative, pressure flow closed-loop control quantitative, servo quantitative machine and the like, wherein the servo quantitative machine has the characteristics of quick response, high instantaneous flow precision, wide viscosity range and the like, and is widely applied to welding vehicles.

Plunger type servo quantifying machine that welding workshop used mainly includes: servo motor, reduction gear, lead screw, filling valve, control system, front end housing, cylinder body, rear end housing, plunger 9 and sealing mechanism. Wherein, front end housing, cylinder body and rear end housing coaxial fixed mounting in proper order, and form a plunger passageway 10 that extends along (front end housing, cylinder body and rear end housing) axis between front end housing, cylinder body and the rear end housing, and with plunger 9 external diameter size adaptation. When glue is supplied, the outer peripheral side wall of the plunger 9 is attached to the inner side wall of the plunger channel 10, the plunger 9 controls the glue to enter and exit through the back and forth telescopic piston motion in the plunger channel 10, and the sealing mechanism is arranged between the plunger 9 and the plunger channel 10 and used for ensuring the tightness between the plunger 9 and the plunger channel 10.

As shown in fig. 1, the sealing mechanism of the quantitative machine is a split structure, comprising two parts, wherein the first sealing part comprises: a step ring 3, a guide ring 5, a doctor ring 6 and O-rings 4 and 7; the group B sealing part comprises an O-ring 1 and a stepped ring 2. When the glue is coated (the plunger piston moves), the scraping ring 6 of the sealing part of the nail group can bear extremely strong high pressure and is extremely easy to wear, and the glue is adhered to the plunger piston 9 after the scraping ring 6 is worn, so that the sealing part of the nail group is damaged, the sealing effect is reduced, and the glue is leaked.

The prior measure for protecting the sealing mechanism is that the softener pipe 8 is filled with the softener every week, the softener cavity 11 is provided with only one opening, the rest part is closed, the opening is communicated with the softener pipe 8, the softener cavity 11 is filled with the softener through the softener pipe 8, the softener cavity 11 is communicated with the plunger channel 10, the softener cavity 11 is positioned between the sealing part A and the sealing part B, the softener is contacted with the plunger 9, the adhesive is difficult to adhere, but in actual work, the adhesive coating amount of the quantitative machine is large, the reciprocating movement times exceed 500 times per day, the filled softener is in a relatively static state, when the adhesive coating amount of the adhesive is gradually increased, the softener cannot be in full contact with the plunger, the residual adhesive cannot be removed when the softener is replaced, the adhesive leakage amount is increased along with the increase of the service time, if the adhesive leakage exceeds the stepped ring 2, the screw is damaged, and the quantitative machine is entirely scrapped when serious. Thus requiring 1 maintenance of the dosing machine every 4 months.

In the maintenance process, the quantitative machine needs to be comprehensively disassembled and assembled, residual glue is removed, and the sealing ring group sleeve is replaced. Every maintenance is completed only when 16 persons are needed for 1 time, the cost for replacing the sealing element is up to 1 ten thousand yuan/sleeve, and the service life of the quantifying machine is greatly shortened due to the increase of the maintenance times. When the accumulated maintenance working hour of a single-automobile mass company reaches 1600 people each year, the accumulated consumption of spare parts is more than 100 ten thousand yuan, so that a device for protecting the sealing element of the quantitative machine and preventing glue leakage is needed.

In view of the above technical problems, the present inventors have finally achieved the present invention through long-time studies and practices.

Disclosure of Invention

In order to solve the technical problems, the invention provides a softener circulation system of a plunger type servo quantifying machine, which ensures that a plunger of the quantifying machine is well lubricated all the time and can timely remove leaked sizing materials.

The invention adopts the technical scheme that:

providing a softener circulation system of a plunger type servo quantifying machine, wherein a plunger of the quantifying machine reciprocates in a plunger channel, and the plunger channel penetrates through the middle part of a softener cavity so as to soften sizing materials attached to the plunger;

one side of the softener cavity is provided with an inlet, the other side of the softener cavity is provided with an outlet, the inlet is connected with a softener filling device, and the softener filling device is used for enabling the softener in the softener cavity to flow, namely, new softener is filled into the softener cavity from the inlet, and old softener containing residual glue is discharged from the outlet.

Further, the quantitative machine stops the glue discharging, and in the process of the return motion of the plunger, the softener filling device fills new softener into the softener cavity.

Further, the softener from the softener source fills the softener chamber and the discharged softener flows back to the softener source to form a circuit.

Further, the softener filling device comprises a cylinder and a softener storage box, the inlet is communicated with the softener storage box through a pipeline, and the cylinder is used as a power source to fill the softener in the softener storage box into the softener cavity.

Further, the softener filling device further comprises a liquid extraction cylinder and two one-way valves, the cylinder is a double-acting cylinder, a liquid outlet of the liquid extraction cylinder is communicated with the inlet through a first pipeline, a liquid inlet of the liquid extraction cylinder is communicated with the softener storage box through a second pipeline, one-way valve is respectively arranged on the first pipeline and the second pipeline in the same direction, and the cylinder acts on the liquid extraction cylinder to enable positive pressure or negative pressure to be generated inside the liquid extraction cylinder.

Further, the softener filling device further comprises an electric control reversing valve, the electric control reversing valve is used for controlling the action of the air cylinder, and the electric control reversing valve adopts a switching signal of a filling valve of the quantitative machine as a control signal source.

Further, the electric control reversing valve is a single electric control two-position five-way reversing valve.

Further, an outlet of the softener chamber is in communication with the softener storage box line.

Further, the interior of the softener storage box is divided into two cavities which are respectively communicated with the inlet and the outlet of the softener cavity, and the two cavities are communicated through a filtering device.

Compared with the prior art, the invention has the beneficial effects that:

1. the system realizes automatic filling of the softening agent, enables the softening agent to circularly move, enables the plunger to be well lubricated all the time, and can timely remove leaked sizing materials.

2. The softener storage box can be placed outside the quantifying machine body, and a pipeline is used for conveying the softener, so that the softener conveying and the lubrication are not influenced no matter how the installing position of the quantifying machine is special;

3. the system adopts an external circulation mode, does not need to stop for inspection in the process of inspection and maintenance, and is convenient for observing the lubrication effect when the quantitative machine works;

4. the system is adopted to fill the softener 1 time a week originally, and the inspection is changed into the inspection of 1 time a week, and the softener is changed into the inspection of 1 time a 3 month, so that the maintenance burden is reduced.

5. The air source and the quantitative machine body needed by the system are universal by using compressed air, and no additional power source is needed.

6. The control signal of the reversing valve of the system is an opening (closing) signal source of a filling valve of the quantifying machine, and softening agent filling is completed in the circulating working process of the quantifying machine.

7. The lubrication cavity in the traditional structure is changed from closed type into flowing type, so that the phenomenon that residual glue is accumulated to obstruct lubrication is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 shows a schematic structural view of a conventional quantitative machine.

FIG. 2 is a schematic view showing the overall structure of a softener circulation system according to an embodiment of the present invention;

fig. 3 shows a schematic view of the circulation principle of the softener circulation system according to the embodiment of the present invention.

Detailed Description

The above and further technical features and advantages of the present invention are described in more detail below with reference to the accompanying drawings.

In the description of the present invention, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description of the present invention, and do not indicate or imply that the devices or elements 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.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" is at least two unless explicitly defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

As shown in fig. 1, a plunger 9 of a conventional plunger type servo quantifying machine reciprocates in a plunger channel 10, and the lower end of the plunger 9 presses a sizing material cavity of the quantifying machine so as to spray sizing material in the sizing material cavity; the plunger 9 returns to enable negative pressure to be generated in the sizing material cavity, and then the sizing material cavity is filled with sizing material. After the scraping ring 6 is worn, the sizing material is adhered to the plunger 9, and the sealing part is broken, so that the sizing material leaks. The plunger passageway 10 runs through the middle part in softener chamber 11, and the softener makes the sizing material be difficult to adhere on plunger 9 with plunger 9 contact, and the softener in softener chamber 11 is in the state of being relatively static among the existing structure, and when the sizing material adhesion volume increases gradually, the softener can't be with the comprehensive contact of plunger, also can't clear away remaining sizing material when changing the softener.

As shown in fig. 2 and 3, in the softener circulation system of the plunger type servo quantitative machine, one side of the softener cavity 11 is provided with an inlet a, the other side is provided with an outlet B, the inlet a is connected with a softener filling device, the softener filling device is used for filling new softener into the softener cavity 11 from the inlet a and extruding old softener containing residual gum from the outlet B, so that the softener in the softener cavity 11 flows, and the flowing softener can take away residual gum in the softener cavity 11, so that the softener and the plunger are ensured to be always in full contact.

In the process of one reciprocating action of the plunger 9 of the plunger type servo quantifying machine, the plunger 9 descends to extrude the sizing material from the channel D, the plunger 9 ascends to enable negative pressure to be formed in the sizing material cavity, and the sizing material is filled into the sizing material cavity from the channel C. When the quantitative machine stops dispensing, namely, in the return (rising) process of the plunger 9, the softener filling device fills new softener into the softener cavity 11, so that the softener in the softener cavity 11 flows, and the old softener containing residual gum is discharged. The softener filling device fills the softener from the softener source into the softener cavity 11, and the discharged softener containing residual gum filters the residual gum and flows back to the softener source to form a circulation loop. The automatic filling of the softening agent is realized, the softening agent moves circularly, the plunger is lubricated well all the time, and the leaked sizing material can be removed in time.

In a specific embodiment, the softener filling device comprises a double-acting cylinder 200, a softener storage box 900, a liquid suction cylinder 300 and two check valves 400 and 500, a liquid outlet 301 of the liquid suction cylinder 300 is communicated with an inlet A of the softener cavity 11 through a first pipeline 600, a liquid inlet 302 of the liquid suction cylinder 300 is communicated with the softener storage box 900 through a second pipeline 700, one check valve 500 and one check valve 400 in the same direction are respectively arranged on the first pipeline 600 and the second pipeline 700, and the double-acting cylinder 200 acts on the liquid suction cylinder 300 to generate positive pressure or negative pressure. The electronically controlled reversing valve 100 is used for controlling the action of the double acting cylinder 200, and the electronically controlled reversing valve 100 adopts the switching signal of the filling valve of the dosing machine as a control signal source. The outlet B of the softener chamber 11 communicates with the softener storage box 900 through a pipe 800. The softener storage box 900 is divided into two cavities 901 and 902, the pipeline 800 is communicated to the cavity 901, the second pipeline 700 is communicated to the cavity 902, and the two cavities are communicated through a filter 903. The air source and the dosing machine body needed by the double-acting air cylinder 200 are common with compressed air, and no additional power source is needed.

The circulation process of the softener circulation system is as follows:

1. the control line signal of the electric control reversing valve 100 is connected with the filling valve signal of the quantifying machine in parallel;

2. when the quantitative machine discharges glue, the quantitative machine filling valve acts, and the electric control reversing valve 100 reverses, the double-acting cylinder 200 is retracted to generate negative pressure in the liquid extraction cylinder 300, at the moment, the one-way valve 500 is closed, the one-way valve 400 is opened, and the softener enters the liquid extraction cylinder 300 from the cavity 902 of the softener storage box 900 through the one-way valve 400, so that the liquid extraction cylinder 300 stores a replacement amount of softener once;

3. when the quantitative machine stops dispensing, the quantitative machine filling valve acts, and the electric control reversing valve 100 reverses and returns to enable the double-acting cylinder 200 to push forwards to apply positive pressure to the liquid extraction cylinder 300, at the moment, the one-way valve 500 is opened, the one-way valve 400 is closed, and the softener in the liquid extraction cylinder 300 enters the second pipeline 700 through the one-way valve 500;

4. the softener enters the inlet a of the softener chamber 11 through the second pipe 700;

5. the softener in the softener cavity 11 is discharged through the outlet B, and residual glue in the cavity is discharged;

6. the softener enters the cavity 901 of the softener storage box 900 through the pipeline 800;

7. the softener in the cavity 901 is provided with residual glue, and after being precipitated in the storage box, the residual glue is filtered by the filter device 903 and flows back into the cavity 902, so that the softener can be repeatedly used.

In a more specific example, the electronically controlled reversing valve 100 is a single electronically controlled two-position five-way reversing valve, the two-position five-way valve is connected in parallel with 24V dc of a filling valve of a dosing machine, and the switching of the opening and closing of the filling valve is used to control the reversing and returning of the two-position five-way valve.

The foregoing description of the preferred embodiment of the invention is merely illustrative of the invention, and is not intended to be limiting. The structure, connection mode and the like of each component in the invention can be changed, and all equivalent changes and improvements performed on the basis of the technical scheme of the invention are not excluded from the protection scope of the invention.

Claims (9)

1. A softener circulation system of a plunger type servo quantifying machine, wherein a plunger of the quantifying machine reciprocates in a plunger channel, and the plunger channel penetrates through the middle part of a softener cavity to soften sizing materials attached to the plunger;

the device is characterized in that an inlet is arranged on one side of the softener cavity, an outlet is arranged on the other side of the softener cavity, the inlet is connected with a softener filling device, the softener filling device is used for enabling the softener in the softener cavity to flow, namely, new softener is filled into the softener cavity from the inlet, and old softener containing residual glue is discharged from the outlet.

2. The softener circulation system of a plunger type servo-type quantitive machine according to claim 1, wherein the softener filling device fills new softener into the softener cavity during the process of stopping the dispensing of the quantitive machine and the return movement of the plunger.

3. A softener circulation system for a plunger type servo-metering machine according to claim 1, characterized in that softener from a softener source is charged into said softener chamber and the discharged softener flows back into the softener source to form a circuit.

4. A softener circulation system for a plunger type servo-quantitative machine according to claim 1, wherein said softener filling means comprises a cylinder and a softener storage box, said inlet is in communication with said softener storage box, said cylinder as a power source for filling said softener chamber with the softener in said softener storage box.

5. The softener circulation system of the plunger type servo quantitative machine according to claim 4, wherein the softener filling device further comprises a liquid suction cylinder and two one-way valves, the cylinder is a double-acting cylinder, a liquid outlet of the liquid suction cylinder is communicated with the inlet through a first pipeline, a liquid inlet of the liquid suction cylinder is communicated with the softener storage box through a second pipeline, one-way valve is respectively arranged on the first pipeline and the second pipeline in the same direction, and the cylinder acts on the liquid suction cylinder to enable positive pressure or negative pressure to be generated inside the liquid suction cylinder.

6. The softener circulation system of a plunger type servo quantifying machine according to claim 4 or 5, wherein the softener filling device further comprises an electric control reversing valve for controlling the action of the cylinder, and the electric control reversing valve adopts a switching signal of a filling valve of the quantifying machine as a control signal source.

7. The softener circulation system of a plunger type servo quantifying machine according to claim 6, wherein the electrically controlled reversing valve is a single electrically controlled two-position five-way reversing valve.

8. A softener circulation system for a plunger type servo-metering machine according to claim 4 or 5, characterized in that the outlet of the softener chamber is in communication with the softener storage box line.

9. The softener circulation system of the plunger type servo quantitative machine of claim 8 wherein the softener storage box is divided into two cavities which are respectively communicated with the inlet and the outlet of the softener cavity, and the two cavities are communicated through a filtering device.