JPS62501965A - Method and apparatus for dispensing at least one viscous substance - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Name of invention] Method and apparatus for dispensing at least one viscous substance [Technical field of invention] The present invention relates to a method and apparatus for dispensing at least one viscous substance. and, more particularly, a viscous multicomponent mixture as defined in the introductory clause of claim 1. This invention relates to a method and apparatus for distributing the components of a compound.

Currently, for example, so-called [high solid lacquer].

Solvent-free two-component types such as IMC lacquer, clear lacquer, etc. Its use is particularly considered from an environmental point of view.

[Prior art] A squeezing unit in which each component of a viscous multi-component mixture is made into an individual powder, the main into the plunger/cylinder unit and then subsequently Distribution and mixing of multi-component systems, such as those fed to mixing and discharge units in a squeezing operation Methods and devices for doing so are known. In most cases, the components are removed by the throttle operation. The component is filled into the squeeze unit at a pressure substantially lower than the pressure being squeezed out. A delivery pump is used for this purpose.

However, the multi-component systems and coatings for complete anti-corrosion protection mentioned above cannot be manufactured using known methods and equipment. Processing by means of the present invention presents certain difficulties for a number of different reasons, as recognized in accordance with the present invention. accompanied by.

In particular, [high solid lacquer J, IMC lacquer, clear lacquer, etc.] In this case, the compressibility of the individual components changes considerably. Moreover, the mixing ratio of individual components is often If the ratio is excessive, it exceeds 10:1. In addition, the high mixing ratio of 100:1 This is not at all rare in branch systems. However, at the same time, the components are partially 1q The following small amounts must also be distributed in minimum amounts.

Attempts to process mixtures with components of considerably different compressibility using known equipment have been unsuccessful at best. This is the beginning of a so-called "mixed bead" and mixed distribution. However, Dara In the case of a distribution amount over a range of colors, the overall mix bead may be Accurately set the fade and/or the distribution that does not occur and inaccurate parts of the whole mix - Becomes useless as it involves over-distribution of beads.

[Description of the present invention] The invention therefore provides for dispensing at least one viscous substance, especially in the formation of multicomponent mixtures. the smallest and smallest amount of highly compressible substances or components with considerably different compressibility. It is based on the problem of presenting a method and device that allows the allocation of minutes.

The claims feature an inventive solution to this problem.

According to the invention, a method according to the introductory clause of claim 1 or 2 respectively or The method or the device may be improved by the features described in the Features section. It was realized that there was a surprising solution to the problem posed above.

The following findings have been specifically adapted as a basis.

Known methods and devices for dispensing at least one viscous substance include The filling pressure at which the unit is filled is below the actual system pressure, i.e. below which pressure is squeezed into the mixing discharge unit. The reason is the known At the same time, the individual components differ due to the pressure increase at the beginning of the squeezing operation. undergoes compression, so that at the beginning of the throttling operation the squeezed volume is no longer squeezed out. Failure to match the volume displaced within the unit results in defects.

According to the invention, this defect is solved by the fact that the pressure effective in the squeezing unit is occurs before the start of the actual squeezing operation, meaning that the pressure in the Avoided by pressure adaptation. The result is an overall “mix” that allocates the least amount. The material begins to be squeezed to achieve a constant mixing ratio throughout the lead. Sometimes it's not compressed in the first place.

Claims 3 to 6 provide that the pressure inside the squeezing unit is controlled by the mixing and discharging unit. A variety of inventive pressure adapter units set to effective levels Characterizing possibilities.

According to claim 3, the pressure adapter unit is provided, for example, in particular with a squeeze ring. Unit that controls the delivery pressure of the feed pump if the pressure in the inlet is below 10 bar. For example, the average delivery pressure of a feed pump is determined by the rotation of the delivery or feed pump. The pressure in the delivery line can be adjusted or controlled by controlling the speed to achieve the desired operation. The value is equal to the pressure or squeezing pressure.

Of course, the viscous substance is supplied at a pressure higher than the effective level in the mixing and discharge unit. For example, a Holp valve or a blow-up valve (claim 4) It is also possible to reduce this pressure at the end of the operation to fill the squeeze unit. be.

Actual number of the pressure adapter unit as characterized in claims 3 and 4 In embodiment A, an inexpensive and reliable delivery pump can be used for this pressure range. Therefore, especially for drawing pressures up to 10 bar, i.e. relatively low drawing pressures. It's suitable. However, there are hundreds of 1MC systems, high solid lacquers, etc. Frequently processed at working pressures as high as bar. Claims 5 and 6 Even in this pressure range, there is a possibility that the pressure will match the pressure before the start of the squeezing operation. It is characterized by

According to claim 5, each squeezing cylinder includes an inner tube of the squeezing cylinder. It is equipped with a pressure sensor to detect the effective pressure on the side. squeezing cylinder When the valve in the delivery squeeze line of the plunger is closed, the pressure is transferred to the squeeze unit. adapted so that the effective pressure in the unit is equal to the pressure in the mixing discharge unit. Ru. Only after completion of such pressure adaptation is the valve opening in the squeezing line initiated. The actual throttle stop operation begins.

Pressure adapter unit for high working pressures, i.e. in the order of several hundred bar Other preferred embodiments of are characterized in claim 6. According to this outline For example, the pressure adapter unit for each component is connected to the squeezing unit via the limb tube. at least one plunger/cylinder unit in communication with the A pressure compensation unit is provided. Consists of plunger/cylinder unit The pressure increasing unit according to the invention accurately increases one or more viscous substances under pressure conditions. Allocation quality is adversely affected due to additional operating modes that allow for allocation Extremely short cycle times can be observed without adverse effects.

At least one type of viscous substance is distributed, in particular a mixture of components whose components exhibit strongly different compressivities. The device of the present invention for dispensing the components of a component mixture comprises a plunger/cylinder unit. If a pressure increasing unit consisting of .

In the first operating mode, the squeezing cylinder and the pressure increasing unit are initially It is filled by a delivery pump. After the filling operation is completed, the pressure is increased from the supply level to the actual operating level.

At the end of the pressure increase phase the actual squeezing operation begins.

In this mode of operation, the volume of the pressure increasing unit is proportional to the volume of the squeezing unit. can be relatively small, and in typical applications this is 5 to 50% of the volume of the squeezing unit. It has the advantage of up to 20%. However, filling occurs via a delivery pump. The system is The disadvantage is that it takes a considerable amount of time to fill the system.

In the second operating mode, during the squeezing operation of the squeezing unit, the pressure increasing unit The knit is filled by a delivery pump. During this operation, the squeezing unit and pressure The valve between the increment units is closed. Pressure increasing unit after the end of the squeezing operation The valve between the and the squeezing unit is opened, so that the squeezing unit plunging within the pressure increasing unit rather than by the delivery pump as in It is filled by the displacement of the chamber. At the end of the filling operation, the pressure increasing unit The valve between the squeezing units is closed again and the squeezing operation is then started.

This mode of operation has extremely short cycle times between the two applications, namely the squeezing operation. There are many reasons why this is possible.

On the other hand, the filling operation is performed at a pressure considerably higher than that present during filling by the delivery pump. The filling of the squeezing unit takes substantially less time because of this. On the other hand, This is also a time-consuming pressure build-up in the squeezing unit that already occurs in the mixing and discharging unit. The material is filled from the pressure increasing unit at a level corresponding to the operating pressure of the Since then, it is no longer necessary. However, this mode is limited by the capacity of the squeezing unit. Pressure with a volume slightly exceeding the volume squeezed out per squeeze or squeeze operation Requires force multiplier units.

However, this drawback is due to the fact that this mode of operation allows for rapid application. fully guaranteed. For example, if the application actuation has an interval of 1 second between each application cycle, Activating the device of the invention in such a manner that it can therefore be performed for intervals of 5 seconds. Can be done. Due to this fact, the device of the present invention or polyethylene, epoxy and Distribution for rapid curing of plastic materials or adhesives such as recon adhesives applications and conveyor lines or assembly required in the automobile and furniture industries. It is also applied to periodic coating of processed parts on assembly lines.

In the past, many machines operated with overlapping squeeze cycles. Allocation problems where the system only involves cycle periods in the range between 1 and 2 seconds It has been used for the purpose of solving problems.

Pressure adapter unit as filling station for actual squeezing unit Due to the inventive adoption of operating a system in which only a single squeeze unit is provided for It is now possible.

In this arrangement, the inventive device is highly packaged from the squeezing unit. and an additional plunger/cylinder unit, e.g. on the pivot arm. The length of the pipe through which the mixture is conveyed due to its close proximity to the point of application It will be considerably reduced.

Claim 8 provides that, according to the invention, an additional plunger/cylinder unit is provided. Another advantageous application of the pressure adapter unit consisting of a set is characterized.

Due to the adoption of an inventive pressure increasing unit, the material in the squeezing cylinder is It is possible to increase the pressure to any settable level.

This arrangement leads to short-term fluctuations in the volume to be ejected, so for example In controlled applications, "mixed beads" of desired thickness and length are It can be created by constant movement of a robot arm.

Claim 9 specifically addresses distributional defects, such as defects that may occur after an extended period of operation. The invention is characterized by an advantageous refinement which avoids this with the highest probability.

According to the invention, distributional deficiencies in a system with a pressure adapter unit are eliminated. It has become clear that failures can in fact always be traced back to the following causes: If the valve in the bottle does not close or is incompletely closed during filling of the squeeze unit. If the valve in the delivery line is closed or not closed during the squeezing operation. is incompletely closed.

In the first case, the squeezing unit is not filled with the desired volume of viscous substance. , while in other cases the material is pushed back into the delivery line and its Only a portion of the pushed back material reaches the discharge device. In both cases the material The specified volume of material is not delivered to the distribution unit.

This is the reason why the pressure sensor of the present invention is provided, especially as a check valve. in the delivery line upstream of the gate valve and downstream of the gate valve. On the output line, these sensors are based on the opening times at individual locations within the line. Detects pressure fluctuations based on standard.

When the goo 1~ valve in the squeezing line is completely closed, the pressure downstream of the gate valve is It should not change as long as the squeeze unit is filled. Set inside the drawing line. If the output signal from the filtered sensor changes during the filling period of the squeezing unit, If the relevant gate valve cannot be closed or the gate valve is damaged, for example due to contamination of the valve seat. It doesn't close completely for some reason. On the other hand, the output signal from the pressure sensor installed in the delivery line The number changes during squeezing operation, provided that the valve in the delivery line is accurately closed. Must not be.

Therefore, the pressure sensor provided by the present invention is allows an accurate indication of the state of the state established by the present invention. is the only cause of real allocation defects.

In an improved preferred embodiment of the invention as characterized in claim 10 and the upstream side of the sensor located in the delivery line and the squeezing line, respectively. Another gate valve is arranged downstream of the inner sensor. These valves are other lines Each of the valves in the valve is opened and closed in combination with other valves. An example of this arrangement is the sensor in the delivery line. e.g. not detecting any resulting pressure fluctuations from the delivery pump; and/or The sensor in the squeezing line may detect pressure fluctuations caused by the ejector, for example. This may falsely indicate the presence of leaks in individual valves, thus making it clear that distribution defects are actually The advantage is that it does not detect variations that would give rise to these defects even if they are not present in the I'm doing it.

Of course, the present invention is applicable to any system that includes multiple squeezing units for each component, Applicable, for example, to the system disclosed in German patent application P3329296.5 It is. In such systems, each drawing unit is connected to other drawing units. The aim is to avoid pressure fluctuations caused by It is combined with a sensor that is "cut off" in both directions by a valve.

[Brief explanation of the drawing] The present invention will hereinafter be described in more detail by means of preferred embodiments with reference to the accompanying drawings. Ru.

FIG. 1 is a schematic diagram of a first embodiment.

FIG. 2 shows a modification of the embodiment shown in FIG.

FIG. 3 shows a partial modification of the example 1g shown in FIG.

Figure 1 is a schematic diagram of the first embodiment 1#, the basic structure of the two-component plastic material. The delivery lines 10 and 11 supplying the component A and the curing agent B are, for example, plunger-type pressure A power pump 14 or 15 is connected to one squeeze cylinder of the squeeze unit 16, respectively. This is provided for the purpose of communicating with 12 or 13. one check valve 18 or 20 each and electrically or pneumatically controllable gate valves 18" or 20", respectively, in line 10. and 11. The squeeze plunger is shown only schematically. It is combined with a squeezing cylinder. The two squeezing units of the squeezing unit 16 The leading edge of the lunger is installed in the squeeze arm 19, so the squeeze cylinder The drum 13 is movable in the direction of arrow 19' for the purpose of changing the mixing ratio.

The squeezing cylinder 12 or 13 is connected to a squeezing inlet 45 or 47, respectively. , an automatically operable gate valve 54 or 55 is inserted in the line.

Pressure lines 56,57 are connected at limb points 49,50 to pressure increasing cylinder 6. 1' and 61'', the cylinders are equipped with pressure increasing units not detailed in the drawings. Each element of the knit 61 is formed. The ram of the plunger is the pressure increasing cylinder 61 ’, 61”, the plunger is guided within the pressure cylinder and the pressure medium For excitation on the cylinder side, preferably against the action of a return spring by compressed air It is arranged. The pressure exerted by the material is sufficient to return the plunger If this is the condition, the return spring can be omitted.

The device described above operates as follows.

When the squeezing cylinders 12 and 13 are filled with the basic component A, all the material is lit. 56 and pressure increasing cylinders 61' and 61'', The ram of the cylinder is positioned in its initial upper position with the cylinder unfilled.

The system is filled with base component A or hardening agent B even before the start of the actual squeezing operation. If the pressure increase unit This causes the lines 45 and 47 as well as the squeezing unit 1 The pressure in 2 and 13 is removed by a discharge unit 50 (not shown) (mixer, pipes, application Increase the pressure to an effective working pressure level within the tank.

At this stage, the material is added during the actual squeezing operation outside the squeezing unit. It is compressed so that it will not be subjected to heavy compression. The reason for this is the elimination of the materials of basic component A and curing agent B. The dispensed volume is equal to the volume "targeted" by the plunger in the squeezing unit. It is for the sake of becoming. As a result, the degree to which the compressibility of individual substances differs from each other Accurate mixing is achieved even in the early stages of the discharge operation, regardless of the situation.

FIG. 2 shows a modification of the embodiment described in connection with FIG. Parts that are the same as those shown in FIG.

Pressure increasing units 61 are squeezed to measure the pressure within these units 61. sensors 62' and 62'' in lines 12 and 13, respectively. Initially after filling the dispensing unit 12 or 13, the plungers 12' and 13' The pressure boosted by the sensor is equal to the operating pressure of the discharge unit 50. 20.54 and 55 are closed. It will be done. Valves 54 and 55 are then opened. A more detailed explanation may be omitted here. An electronic control device 5 that can be realized by a common device known in the control system so that 7 is provided for pressure measurement and excitation of plungers 12' and 13' with compressed air. A valve 54 as well as an excitation unit 56 (for displacement and distribution of the plunger) and 55.

FIG. 3 shows a partial variation of the embodiment described in connection with FIG. 1, Parts that are the same as those in Figure 1 have the same reference numbers so that further explanation may be omitted here. It is expressed as

The two gate valves 18 and ]8" or 20 and 20" are connected to the squeezing cylinder 12 or is inserted into the line leading to 13, and both of these gate valves can be opened and closed.

For example, one valve in each valve pair may automatically close as a result of a return shock. Wear. Other valves (also called safety valves) are then activated due to the closure of the check valve type valve. Also referred to as a force closed or check valve.

Of course, it is also possible, for example, to activate both valves by the control system.

Each pressure sensor 18' and 20' is located in a line segment between each pair of valves. For the purpose of detecting the pressure of two pairs of valves] between 8 and 18'' or 20 and 20'' It is arranged in

The squeezing cylinders 12 and 13 are connected via squeezing lines 45 and 47. connected to a discharge device not shown in the document, and whose location is at the location of the discharge device. The separated components are mixed and discharged. Valve 54 and 54'' or 55 and 55'' A pressure sensor 54' or 55 is provided in the squeezing lines 45 and 47, respectively. ' to pick up the pressure in the line segment between each two valves. It is positioned between each pair of valves. Valves 54 and 55 are normally automatically energized gates. gate valves, and the control system closes these gate valves at the end of the squeezing operation. , reopens at the start of another squeeze operation.

Pressure sensors are used to detect time-based fluctuations in output signals from various pressure sensors. Sir 18', 20'.

An evaluation circuit (not shown) is provided downstream of 54' and 55'.

According to the present invention, in fact, erroneous The following causes are recognized as causes of allocation:

The individual squeeze cylinders 12 and 13 are connected via a line to the discharge unit. The valve connected to the valve may not close or be closed incompletely during the filling operation. This results in individual cylinders not being filled with the exact volume of material.

The individual squeeze cylinders 12 and 13 are connected via associated lines to a discharge pump. During the squeezing operation, some of the Material is pushed back into the discharge pipe, resulting in less material in the discharge device than expected. The material dispensed will be squeezed out of the cylinder.

Causes of incorrect closing of the valve can be caused by e.g. This could be an error in operation (if provided for manual operation) or a contaminated valve seat.

When the valve is accurately closed, the pressure remains constant as does the output signal from each individual pressure sensor. It remains constant within the line segment between the valves. During squeezing operation Fluctuations in the output signals from sensors 18' and 20' or sensors opened during sending operation. Fluctuations in the output signals from sensors 54' and 55' therefore cause at least one of the valves to The valve does not close or closes only incompletely, whether as a result of an operating error or Please note that this is due to fraudulent entertainment and therefore do not expect inaccurate allocations to occur. This indicates that the

Any type that can be used within the pressure range occurring in the individual system (up to several hundred bar) For example, a type pressure increase device may not be able to close the valve correctly due to contamination of the valve seat. The mold is suitable for resolving pressure fluctuations that can occur within individual systems when It is possible to consider its application as a sensor. These pressure sensors Since it is commercially available, there is no need to discuss its design in detail here.

For example, as a function of the operating state of the system (cylinder filling/cylinder squeezing) to pick up the output signal and fluctuations from the sensor based on time, and The output signal from one of the sensors changes during the operating state in which the output signal is to change. A microprocessor circuit that generates an alarm when the Detects variations in the output signal from a pressure sensor with respect to time using a custom circuit I can do it. This alarm indicates that the multicomponent distribution mixing system is switched off and/or It can be used to signal to the operator the possibility of accurate allocation.

Since there are no difficulties in designing such an evaluation circuit, please provide a detailed explanation. can be omitted here.

The invention has been described above with reference to specific examples.

However, variations are possible, mostly within the overall inventive concept. .

The device of the invention can also be employed, for example, for dispensing a single component or more than one component. be. Provided that these components do not cause any pressure fluctuations as a result of the system design. In other words, the throttle is designed to prevent pressure fluctuations caused by other conditions, for example. Provided that the ejector is closed while the dispensing cylinder is being filled. Additional valves that “isolate” associated sensors from the delivery pump or evacuation unit You can also omit it.

Of course, one or more squeezing units may be provided for each component to ensure pressure compensation. The basis of the invention is for devices with the possibility of "overlapping" operation of the individual squeezing units. It is also possible to apply the concept of

For examples of such systems for high system pressures, see Media System Pressure. Related German patent application P3329296.5 and German patent application P341515 It is explained in 3.9. (Here, we will refer to the contents of these patent applications.

) In such systems, each squeeze cylinder has both filling and squeeze sides. A combination including two gate valves and a pressure sensor between the two gate valves on one side. It is related to Gate valves on all squeeze cylinders for individual components Drawing cylinders related to common delivery lines or drawing lines located within the line segment that connects the individual pressure sensor The output signal from the It will be evaluated in the same manner as in the case.

Pressure adapter with a sensor that generates a signal if the required pressure increase cannot be achieved. They can also be arranged in a tar unit. This condition can be caused by, for example, insufficient material capacity. 1 shows incorrect filling of one cylinder of the squeeze cylinder due to product. example For example, when a base ingredient runs out, the constant lag that occurs in conventional systems Excessive pressure build-up within the system can thus be effectively avoided.

The arm that connects the two squeezing units is omitted and the two squeeze units are replaced. A rigid connection between plunger/cylinder units is also possible.

However, in these cases, the mixing ratio is determined by the geometric relationship of the squeezing unit. be done.

Most systems can be used to drive individual units. like this Examples of such drives are listed in the German patent application mentioned above.

international search report ANNEX To INTERhJATrONAr, 5EARCHREPO RT 0NFR-A-242656121/12/79 None

Claims (11)

[Claims] 1. Each component is filled into the relevant individual squeeze unit and the subsequent squeeze operation In particular, components of viscous multicomponent mixtures such as those delivered to a mixing discharge unit during A method for distributing at least one cheek viscous substance, the method comprising: distributing at least one cheek viscous substance in a squeezing unit; The prevailing pressure in the mixing discharge unit is matched to the prevailing working pressure in the mixing discharge unit before An allocation method characterized by: 2. One squeezing unit for each component, delivery equipped with valves (18, 20) It communicates with the delivery pump (14, 15) via the delivery line (10, 11) and the valve (5 4, 55) is connected to the mixing and discharging unit (50) via a squeezing line equipped with An apparatus for carrying out the method according to claim 1, comprising a squeezing unit that passes through the one pressure adapter or pressure increasing unit is provided for each component; Before the unit starts the actual squeezing operation, the squeezing cylinders (12, 13 ) to the prevailing pressure in the mixing discharge unit (50). A device featuring: 3. The average pressure level in the delivery lines (10, 11) is equal to 7) the pressure adapter unit in such a way that it equals the average pressure level within Claim 1, characterized in that the delivery pressure of the delivery pump (14, 15) is controlled. The device according to item 2. 4. The squeezing unit (16, 18 ) in which the pressure adapter unit includes a blow-up valve. 3. The device according to claim 2, characterized in that 5. During the displacement of the plunger (12', 13'), the pressure is measured with a closed valve and discharged. in the discharge line (45, 37) when the operating pressure level of the unit (50) is reached. A pressure sensor in each squeezing unit (12, 13) that opens the valve (54, 55) Device according to claim 2, characterized in that it is provided in a pressure increasing unit. . 6. Pressure increase units (61, 61') each provide one branch tube (5) for pressure increase. 6, 57) and two squeeze units via a plunger/cylinder unit. It communicates with the delivery line (15, 11) of the knit (12, 13) and fills the system. It can be filled with individual components when pumping, and the pressure is can be excited via a pressure medium in such a way that the force can be set to a predetermined level. 3. The device according to claim 2, characterized in that: 7. The squeezing unit via an additional plunger/cylinder unit 7. Device according to claim 6, characterized in that it is filled. 8. For a constant cross-section of the mixing and/or discharging unit and for increasing discharge rates: The working pressure in the squeezing unit is controlled by the second plunger / according to a specific program. Claim 6, characterized in that it is controllable by a cylinder unit. or the device according to paragraph 7. 9. The upstream side of the valves (18, 20) in the delivery line (10, 11) and the squeezing line for the purpose of detecting incorrect distribution both downstream of the valves (54, 55) in the be equipped with one pressure sensor (18', 20', 54', 55') each. and an evaluation circuit that distributes the output signal from the pressure sensor on a time basis. Unacceptable pressure fluctuations detected in relation to operating conditions and during specific operating conditions Each of claims 1 to 8 is characterized in that an alarm signal indicating the Apparatus described in section. 10. Upstream of the sensor in the delivery line and downstream of the sensor in the squeezing line are each equipped with other valves (18'', 20'', 54'', 58''), and each Claims characterized in that the valve is energizable in cooperation with other valves in the line. Apparatus according to clause 9. 11. each one sensor is provided for detecting a lack of material in the pressure increasing unit; This sensor picks up the stroke of the plunger of the pressure increasing unit. An apparatus according to any one of claims 5 to 10, characterized in that: