Softener circulation system for plunger servo doser

Abstract

The application provides a softener circulating system of a plunger type servo dosing machine, which realizes automatic softener filling, softener circulation, good lubrication of the plunger and timely removal of leaked rubber material. The system uses compressed air as power, connects a two-position five-way valve with a 24V direct current of a dosing machine filling valve in parallel, uses switching of opening and closing of the filling valve to control switching and resetting of the two-position five-way valve. The two-position five-way valve is connected with a cylinder to control extension and retraction of the cylinder. The cylinder is connected with a liquid pumping cylinder, and the liquid pumping cylinder is connected with two one-way valves. When the dosing machine filling valve is opened and the two-position five-way valve switches, the cylinder retracts, the liquid inlet one-way valve opens, the liquid outlet one-way valve closes, and the softener enters the liquid pumping cylinder. When the dosing machine filling valve is closed and the switching valve resets, the cylinder extends, the liquid inlet one-way valve closes, the liquid outlet one-way valve opens, the softener in the liquid pumping cylinder is sent to a softener cavity of the dosing machine, and the old softener returns to a storage box.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plunger type dosing machine, in particular to a softener circulating system of plunger type servo dosing machine. BACKGROUND

[0002] Nowadays, the automobile product develops towards safety energy saving, green environmental protection and non-pollution. In the automobile production process, the glue for vehicle body is very important and is widely used. The glue coating for vehicle body welding not only can play the role of sealing, shock absorption, rust prevention, sound and heat insulation and noise reduction, but also can replace the traditional process such as spot welding and arc welding to realize the connection of sheet metal parts, so as to optimize the production process. Therefore, the precise dosing equipment is the key equipment for glue coating. The dosing methods of the existing precise dosing equipment mainly include precise gear dosing, pressure flow closed loop control dosing and servo dosing machine, etc. Among them, the servo dosing machine has the characteristics of fast response, high instantaneous flow accuracy and wide viscosity range, and has been widely used in welding workshops.

[0003] The plunger type servo dosing machine used in the welding workshop mainly includes a servo motor, a speed reducer, a screw rod, a filling valve, a control system, and a front end cover, a cylinder body, a rear end cover, a plunger 9 and a sealing mechanism. Among them, the front end cover, the cylinder body and the rear end cover are coaxially fixed and installed in sequence, and a plunger channel 10 extending along the axis of the front end cover, the cylinder body and the rear end cover and adapted to the outer diameter size of the plunger 9 is formed between the front end cover, the cylinder body and the rear end cover. When the glue is supplied, the outer peripheral side wall of the plunger 9 is attached to the inner side wall of the plunger channel 10, and the plunger 9 controls the in and out of the glue by doing the "piston movement" of stretching and contracting in the plunger channel 10, and the sealing mechanism is arranged between the plunger 9 and the plunger channel 10 to ensure the sealing between the plunger 9 and the plunger channel 10.

[0004] As shown in Figure 1 The sealing mechanism of the dosing machine is a split structure, including two parts. Among them, the sealing part of the A group includes a stepped ring 3, a guide ring 5, a glue scraping ring 6 and O-rings 4 and 7; the sealing part of the B group includes an O-ring 1 and a stepped ring 2. When coating glue (the plunger does "piston movement"), the glue scraping ring 6 of the sealing part of the A group will bear extremely high pressure and is extremely easy to wear. After the glue scraping ring 6 is worn, the glue will adhere to the plunger 9, which will damage the sealing part of the A group, reduce the sealing effect and cause the glue to leak.

[0005] The current protection sealing mechanism is to add softening agent to the softening agent pipe 8 every week, the softening agent cavity 11 has only one opening and the rest is closed, the opening is communicated with the softening agent pipe 8, the softening agent cavity 11 is filled with softening agent through the softening agent pipe 8, the softening agent cavity 11 is communicated with the plunger channel 10, the softening agent cavity 11 is located between the group A sealing part and the group B sealing part, the softening agent contacts the plunger 9 to make the rubber difficult to adhere, but in actual work, it is found that the glue coating amount of the dosing machine is large, the reciprocating motion frequency is more than 500 times / day, and the added softening agent is in a relatively static state, when the rubber adhering amount gradually increases, the softening agent cannot be in full contact with the plunger, and the residual rubber cannot be removed when the softening agent is replaced, and with the increase of the use time, the rubber leakage amount also increases, if the rubber leakage exceeds the step ring 2, the screw of the dosing machine will be damaged, and the whole dosing machine will be scrapped in severe cases. Therefore, the dosing machine needs to be maintained once every 4 months.

[0006] During the maintenance process, the dosing machine needs to be completely disassembled, the residual rubber is removed, and the sealing ring group cover is replaced. 16 people are needed to complete the maintenance once, and the cost of replacing the sealing part is as high as 10,000 yuan / set, and the increase of the maintenance frequency will greatly shorten the service life of the dosing machine. Only the FAW Volkswagen Chengdu Branch accumulates maintenance man-hours of 1600 people per year, and accumulates spare part costs of more than 100 million yuan, therefore, a device for protecting the sealing part of the dosing machine and preventing rubber leakage is needed.

[0007] In view of the above technical problems, the inventors have finally obtained the present application after a long period of research and practice. SUMMARY

[0008] To solve the above technical problems, the present application provides a softening agent circulating system of a plunger type servo dosing machine, which can always lubricate the plunger of the dosing machine and remove the leaked rubber in time.

[0009] The technical scheme adopted by the present application is characterized in that:

[0010] A softening agent circulating system of a plunger type servo dosing machine is provided, the plunger of the dosing machine reciprocates in the plunger channel, the plunger channel penetrates the middle part of the softening agent cavity to soften the rubber adhered to the plunger;

[0011] One side of the softening agent cavity is provided with an inlet, and the other side is provided with an outlet, the inlet is connected with a softening agent filling device, and the softening agent filling device is used to flow the softening agent in the softening agent cavity, that is, new softening agent is filled into the softening agent cavity from the inlet, and old softening agent containing residual rubber is discharged from the outlet.

[0012] Further, during the process of stopping glue output and plunger return movement of the dosing machine, the softening agent filling device fills new softening agent into the softening agent cavity.

[0013] Further, the softening agent from the softening agent source is filled into the softening agent cavity, and the discharged softening agent flows back to the softening agent source to form a loop.

[0014] Further, the softening agent filling device comprises a cylinder and a softening agent storage box, the inlet is in pipeline communication with the softening agent storage box, and the cylinder serves as a power source to fill the softening agent in the softening agent storage box into the softening agent cavity.

[0015] Further, the softening agent filling device further comprises a liquid suction cylinder and two one-way valves, the cylinder is a double-acting cylinder, the liquid outlet of the liquid suction cylinder is in communication with the inlet through a first pipeline, the liquid inlet of the liquid suction cylinder is in communication with the softening agent storage box through a second pipeline, and one one-way valve is arranged on the first pipeline and the second pipeline respectively in the same direction, and the cylinder acts on the liquid suction cylinder to generate positive pressure or negative pressure in the liquid suction cylinder.

[0016] Further, the softening agent filling device further comprises an electrically controlled reversing valve, the electrically controlled reversing valve is used to control the action of the cylinder, and the electrically controlled reversing valve uses the opening and closing signal of the filling valve of the dosing machine as a control signal source.

[0017] Further, the electrically controlled reversing valve is a single electrically controlled two-position five-way reversing valve.

[0018] Further, the outlet of the softening agent cavity is in pipeline communication with the softening agent storage box.

[0019] Further, the softening agent storage box is divided into two cavities, which are respectively in communication with the inlet and the outlet of the softening agent cavity, and the two cavities are connected through a filtering device.

[0020] Compared with the prior art, the beneficial effects of the present application are as follows:

[0021] 1. The system realizes automatic softening agent filling, makes the softening agent circulate, lubricates the plunger all the time, and can timely remove the leaked rubber material.

[0022] 2. The softening agent storage box can be placed outside the body of the dosing machine, and the pipeline is used for softening agent conveying. No matter how special the installation position of the dosing machine is, the softening agent conveying and lubrication are not affected.

[0023] 3. The system adopts an external circulation mode, and the dosing machine does not need to be stopped for inspection during inspection and maintenance, and the lubrication effect can be conveniently observed when the dosing machine works.

[0024] 4. The system changes the original softening agent filling once a week to once a week inspection and once every three months replacement of the softening agent, thereby reducing the maintenance burden.

[0025] 5. The air source and the quantitative machine body of the system use compressed air in common, and no additional power source is needed.

[0026] 6. The reversing valve control signal of the system is a quantitative machine filling valve opening (closing) signal source, and the softener filling is completed in the process of the quantitative machine cycle operation.

[0027] 7. The lubricating cavity in the traditional structure is changed from a closed type to a flow type, so as to avoid the accumulation of residual glue to hinder lubrication. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0029] Figure 1 The structure schematic diagram of the existing quantitative machine is shown.

[0030] Figure 2 The overall structure schematic diagram of the softener circulating system of the embodiment of the present application is shown.

[0031] Figure 3 The circulating principle schematic diagram of the softener circulating system of the embodiment of the present application is shown. DETAILED DESCRIPTION

[0032] The above and other technical features and advantages of the present application will be described in more detail below with reference to the accompanying drawings.

[0033] In the description of the present application, it should be understood that the orientations or positional relationships indicated by 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" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application, 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 therefore cannot be understood as a limitation on the present application.

[0034] In addition, the terms "first", "second", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, unless otherwise explicitly specified and limited.

[0035] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] As shown in Figure 1 The plunger 9 of the existing plunger type servo dosing machine reciprocates in the plunger channel 10, the lower end of the plunger 9 presses the rubber cavity of the dosing machine, and the rubber in the rubber cavity is sprayed out; the plunger 9 returns to make the rubber cavity produce negative pressure, and then the rubber cavity is filled with rubber. The wear of the rubber removing ring 6 will cause the rubber to adhere to the plunger 9, destroy the sealing part, and cause the rubber to leak. The plunger channel 10 penetrates the middle part of the softener cavity 11, and the softener contacts the plunger 9, which makes it difficult for the rubber to adhere to the plunger 9. In the existing structure, the softener in the softener cavity 11 is in a relatively static state, and when the amount of rubber adhered gradually increases, the softener cannot be in full contact with the plunger, and the residual rubber cannot be removed when the softener is replaced.

[0037] As shown in Figure 2 , The softener circulation system of the plunger type servo dosing machine is shown in Figure 3 The softener cavity 11 is provided with an inlet A on one side and an outlet B on the other side, the inlet A is connected with a softener filling device, the softener filling device is used to fill new softener into the softener cavity 11 from the inlet A, and the old softener containing residual rubber is squeezed out from the outlet B, so that the softener in the softener cavity 11 flows. It can be understood that the flowing softener carries away the residual rubber in the softener cavity 11, and ensures that the softener and the plunger are in full contact at all times.

[0038] The plunger 9 of the plunger type servo dosing machine extrudes the rubber material from the channel D during a reciprocating motion, and the rubber material is filled into the rubber material cavity from the channel C when the plunger 9 is raised to form a negative pressure in the rubber material cavity. When the dosing machine stops discharging the rubber material, i.e. during the return (raising) of the plunger 9, the softener filling device fills the new softener into the softener cavity 11 to make the softener in the softener cavity 11 flow and discharge the old softener containing residual rubber material. The softener filling device fills the softener from the softener source into the softener cavity 11, and the discharged softener containing residual rubber material flows back to the softener source after filtering the residual rubber material, forming a circulation loop. The automatic softener filling is realized, the softener circulates, the plunger is always well lubricated, and the leaked rubber material can be removed in time.

[0039] 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 one-way valves 400, 500. The liquid outlet 301 of the liquid suction cylinder 300 is communicated with the inlet A of the softener cavity 11 through a first pipeline 600, the liquid inlet 302 of the liquid suction cylinder 300 is communicated with the softener storage box 900 through a second pipeline 700, one-way valves 500, 400 of the same direction are arranged on the first pipeline 600 and the second pipeline 700 respectively, and the double-acting cylinder 200 acts on the liquid suction cylinder 300 to generate positive pressure or negative pressure in the liquid suction cylinder 300. The electric control reversing valve 100 is used to control the action of the double-acting cylinder 200, and the electric control reversing valve 100 uses the opening and closing signals of the filling valve of the dosing machine as the control signal source. The outlet B of the softener cavity 11 is communicated with the softener storage box 900 through a pipeline 800. The softener storage box 900 is divided into two cavities 901, 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 device 903. The air source required by the double-acting cylinder 200 and the compressed air used by the dosing machine body are general, and no additional power source is needed.

[0040] The circulation process of the softener circulation system is as follows:

[0041] 1. The control line signal of the electric control reversing valve 100 is connected in parallel with the dosing machine filling valve signal;

[0042] 2. When the dosing machine discharges the rubber material, the dosing machine filling valve acts, and at the same time, the electric control reversing valve 100 is reversed, the double-acting cylinder 200 is retracted to generate negative pressure in the liquid suction cylinder 300, at this time, the one-way valve 500 is closed, the one-way valve 400 is opened, the softener is filled from the cavity 902 of the softener storage box 900 into the liquid suction cylinder 300 through the one-way valve 400, and a replacement amount of softener is stored in the liquid suction cylinder 300;

[0043] 3. When the dosing machine stops dispensing glue, the dosing machine filling valve acts, and the electrically controlled reversing valve 100 reverses and returns to the original position, so that the double-acting cylinder 200 pushes forward, and applies positive pressure to the suction cylinder 300. At this time, the one-way valve 500 is open, and the one-way valve 400 is closed, so that the softener in the suction cylinder 300 enters the second pipeline 700 through the one-way valve 500;

[0044] 4. The softener enters the inlet A of the softener cavity 11 through the second pipeline 700;

[0045] 5. The softener in the softener cavity 11 is discharged through the outlet B, and the residual glue in the cavity is discharged;

[0046] 6. The softener enters the cavity 901 of the softener storage box 900 through the pipeline 800;

[0047] 7. The softener in the cavity 901 has residual glue, which is precipitated in the storage box and then flows back to the cavity 902 through the filtering device 903, so that the softener can be repeatedly used.

[0048] In a more specific example, the electrically controlled reversing valve 100 is a single electrically controlled two-position five-way reversing valve, which is connected in parallel with the 24V direct current of the dosing machine filling valve, and uses the switching of the opening and closing of the filling valve to control the reversing and returning of the two-position five-way valve.

[0049] The above is only a preferred embodiment of the present application, which is only illustrative but not limiting. The structure and connection mode of the components in the present application can be changed, and any equivalent transformation and improvement based on the technical scheme of the present application should not be excluded from the protection scope of the present application.

Claims

1. A softener circulation system of a plunger servo dosing machine, the plunger of the dosing machine reciprocates in a plunger channel, the plunger channel penetrating the middle of a softener cavity to soften the rubber attached to the plunger; one side of the softener cavity is provided with an inlet, and the other side is provided with an outlet, the inlet is connected with a softener filling device, the softener filling device is used to flow the softener in the softener cavity, that is, to fill new softener into the softener cavity from the inlet, and to discharge old softener containing residual rubber from the outlet; the softener filling device comprises a cylinder, a softener storage box, a liquid suction cylinder and two one-way valves, the inlet is in pipeline communication with the softener storage box, the cylinder as a power source fills the softener in the softener storage box into the softener cavity; the cylinder is a double-acting cylinder, the outlet of the liquid suction cylinder is in communication with the inlet through a first pipeline, the inlet of the liquid suction cylinder is in communication with the softener storage box through a second pipeline, one one-way valve is arranged on the first pipeline and the second pipeline respectively, the cylinder acts on the liquid suction cylinder to generate positive pressure or negative pressure in the liquid suction cylinder. characterized in that The softener filling device fills new softener into the softener cavity in the process of the return movement of the plunger when the dosing machine stops discharging rubber. The softener from the softener source is filled into the softener cavity, and the discharged softener flows back to the softener source to form a loop.

2. A softener circulation system for a piston-type servo doser as claimed in claim 1, characterized in that The softener filling device further comprises an electric control reversing valve, the electric control reversing valve is used to control the action of the cylinder, and the electric control reversing valve uses the opening and closing signal of the filling valve of the dosing machine as a control signal source.

3. A softener circulation system for a piston-type, servo-dosing machine as claimed in claim 1, characterized in that, The electric control reversing valve is a single electric control two-position five-way reversing valve.

4. A softener circulation system for a piston-type, servo-dosing machine as defined in claim 1, characterized in that, The outlet of the softener cavity is in pipeline communication with the softener storage box.

5. A softener circulation system for a piston-type, servo-dosing machine as claimed in claim 4, characterized in that, The softener storage box is divided into two cavities, which are respectively in communication with the inlet and the outlet of the softener cavity, and the two cavities are connected through a filter device.

6. A softener circulation system for a piston-type, servo-dosing machine as defined in claim 1, characterized in that, The softener filling device fills new softener into the softener cavity in the process of the return movement of the plunger when the dosing machine stops discharging rubber.

7. A softener circulation system for a piston-type, servo-dosing machine as defined in claim 6, characterized in that, The softener from the softener source is filled into the softener cavity, and the discharged softener flows back to the softener source to form a loop. The softener filling device further comprises an electric control reversing valve, the electric control reversing valve is used to control the action of the cylinder, and the electric control reversing valve uses the opening and closing signal of the filling valve of the dosing machine as a control signal source. The electric control reversing valve is a single electric control two-position five-way reversing valve. The outlet of the softener cavity is in pipeline communication with the softener storage box. The softener storage box is divided into two cavities, which are respectively in communication with the inlet and the outlet of the softener cavity, and the two cavities are connected through a filter device.

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