CZ36104U1 - High pressure washer for removing labels from washed items - Google Patents

Description

High-pressure washing equipment for removing labels from washed objects

Field of technology

The technical solution relates to a washing device for pressure washing objects and removing pasted information labels from these objects so that they can be returned to circulation.

Current state of the art

The removal of dirt from objects not only of everyday use belongs to completely real and widely used technologies today. The main advantage of using dishwashers of different sizes or functions is the saving of human labor and also the protection of health, compared to laborious manual washing.

When choosing technologies for the washing method, the choice of washing products and filter technologies, the input parameter is primarily the requirement for the quality of washing and the removal of impurities, as well as the origin of impurities. The goal is therefore both to achieve maximum washing quality and to achieve maximum environmental friendliness and waste disposal. A very important factor is not only to minimize the production of solid waste, but also liquid waste, including dirty water.

Simple chamber washing devices requiring storage and subsequent removal of each individual item to be washed are known from technical practice. These devices usually have a small washing capacity and the washing process is therefore quite lengthy. Examples of this technology include the classic kitchen dishwasher. From the document DE 3828035, however, a line device is also known where items to be washed are weighed in binders that already automatically pass through individual parts of the line so that at the end the binder is full of clean washed items.

The washing device usually has a connection for clean washing water, a tank of cleaning agent that is mixed into the water to increase the washing effect, an energy source for heating the water and an electrical energy source for driving electrical aggregates, mainly electric motors, pumps and electric motors for rotary drying and drying fans. The basis of the usual construction of a washing device is one or more washing boxes, which are often equipped with a belt or other conveyor device that moves objects intended for washing from the entrance to the exit of the washing box. The washing box is usually equipped with at least one shower set, which consists of a low-pressure, medium-pressure or high-pressure pipe with one or more nozzles arranged in nozzle assemblies. The washing device also consists of low-pressure and/or high-pressure pumps, which ensure the flow of water in the pipes from the reservoirs through the nozzles to the outlet or, instead of the outlet, through the filter device back to the inlet supply pipe of the pump. In addition to the relevant pumps, the filtration equipment includes one or more filters of different constructions and coarseness, even though this type of equipment is usually only coarse particle filters.

The technology of the washing process, otherwise known as showering, is based on two basic variants. The first variant presented, for example, in document GB 2181205, is the placement of shower nozzles in a ring, where the washed objects rotate inside the washing ring in a circle. Together with the possibility of using the filming of washed objects during rotation, the washing current also reaches places that are otherwise hard to reach. The opposite example is a classic kitchen dishwasher, where the jets rotate and the items to be washed are basically placed stationary in washing baskets or boxes. The set of nozzles can be several in different layouts and directions.

The main problem of known washing devices is generally a high consumption of clean water and a high production of polluted water. High-pressure pumps are usually very sensitive to the size of impurities in the water. Document NL 2015322 B1 describes a line washing assembly, consisting of several washing boxes connected to each other, between which the washed object passes smoothly. Each of the boxes is equipped

- 1 CZ 36104 UI by a different set of washing nozzles with a different direction of the washing current. This is a high-pressure washing concept with a pressure of up to 10 MPa.

At present, when washing crates with affixed labels, pressurized water produced by a pressure pump with a maximum outlet pressure of up to 16 MPa is used, which is able to work with filtered water with partial pollution, obtained by commonly used rough cleaning methods. In practice, however, it has been shown that a washing line equipped with this pump has a maximum washing efficiency of 50%, because an even higher washing pressure needs to be achieved to perfectly remove the stuck-on labels from the crate. However, this is not possible, because pumps commonly available on the market capable of developing such pressure only work with clean water. The consumption of water by the washing line is enormous and the operation of the washing line is therefore very expensive, while the price of water continues to rise year after year and its reserves are rapidly decreasing.

The main task of the subject technical solution is to create a washing device for pressure washing objects and removing pasted information labels from these objects, e.g. from plastic crates, which would be able to clean and filter the waste water from washing to such a purity that it can be reused for further washing with washing pressure higher than 16 MPa. The goal is to save a significant portion of otherwise normally consumed clean water by replacing it with filtered water, i.e. purified at least once. By increasing the washing pressure, the goal is to achieve an increase in the washing effect. By using filtered water, the simultaneous goal of significantly reducing the costs of operating a washing line and significantly reducing the environmental burden from the operation of such a washing device is pursued.

The essence of the technical solution

The shortcomings of currently known washing devices are overcome by the high-pressure washing device described below, designed primarily for pressure washing objects and removing stuck-on information labels from these objects, e.g. from crates. The basis of the presented high-pressure washing equipment is a washing box, a washing set and a filter unit. In the presented case, it is a high-pressure washing device including at least one washing box equipped with a conveyor device for moving washed objects, at least one shower set and at least one filter unit. The shower set includes at least one high-pressure pump to which at least one high-pressure pipe is connected. This high-pressure pipe is then terminated by at least one high-pressure shower nozzle, which performs its own operation of removing labels from washed items by washing. The filter unit, washing box and shower set are interconnected by a low-pressure pipe with at least one low-pressure pump. The filtration unit of this high-pressure washing device consists of three filters, which are arranged one behind the other in the direction of the flow of polluted water from the washing box. The first filter is a drum filter of coarse particles equipped with a filter insert for the separation of particles over 400 pm in size. The second filter is a drum filter for coarse particles equipped with a filter insert for the separation of particles larger than 50 pm. The third filter is a bag filter equipped with a filter insert for the separation of particles larger than 50 pm. The high-pressure pump, which is part of the high-pressure washing equipment and generates the required washing pressure of the filtered washing water, has an output pressure higher than 16 MPa.

In an advantageous embodiment, the high-pressure pump has an output pressure in the range of 20 to 30 MPa, while this pressure has been shown to be optimal in tests for achieving the maximum washing effect and efficiency in removing stuck-on labels.

In another advantageous embodiment, the shower set is equipped with several high-pressure shower nozzles at the same time. These high-pressure shower nozzles have a conical nozzle. This type of nozzle ensures a conical shape of the water stream coming out of the high-pressure shower nozzle, while this shape of the water stream maintains very well the required pressure characteristics given by the high-pressure pump. When placing several high-pressure shower nozzles in the assembly of one shower set, the distance between two adjacent high-pressure shower nozzles located inside the washing box is 100 to 150 mm. The optimal distance of the high-pressure shower nozzle from the object to be washed is 150 to 250 mm.

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In another advantageous embodiment, the third filter is equipped with a first pressure measuring device at its inlet and a second pressure measuring device at its outlet. The first pressure measuring device senses the magnitude of the inlet and outlet pressure on the low-pressure pipeline before the third filter to evaluate the functionality of the filtration occurring on the first filter and the second filter. This enables early detection of excessive clogging of the first filter and/or second filter or their damage, i.e. malfunction. The second pressure measuring device is used to sense the amount of pressure on the low-pressure pipeline behind the third filter, which enables early detection of excessive clogging of the third filter or detects its malfunction.

In the following advantageous embodiment, the first filter and the second filter are made of a casing made of stainless steel material and/or material with a stainless steel surface treatment. A separation drum made of stainless steel material and/or material with a stainless surface finish is rotatably mounted inside the casing. This separation drum is provided along its circumference with openings for the passage of water out of the separation drum into the inner cavity of the first filter or the second filter bounded by a casing. While the holes in the separation drum serve mainly for the simple flow of water, the inside of the separation drum is equipped with a replaceable filter insert, which is anchored to it from the inside with anchoring elements. The task of the filter element is mainly to separate solid impurities from the flowing water, where the effect of separation depends mainly on the roughness of the structure of the filter element.

In another advantageous embodiment, the third filter is made of a casing made of stainless steel material and/or material with a stainless steel surface treatment, which is provided with an internal bag-shaped filter insert inside. The third filter is equipped with at least one polluted water inlet and at least one filtered water outlet. Polluted water flows through the entrance to the third filter into the inner cavity of the filter insert, passes through its walls, and solid impurities are separated. Subsequently, the filtered water leaves the outlet of the third filter.

In another preferred embodiment, the filter insert is made of textile material and/or plastic mesh. The density of the material of the filter insert is determined by the requirement for the efficiency and effectiveness of the separation of solid particles from the flowing water.

In the following advantageous embodiment, the high-pressure washing device includes at least two washing boxes assembled into one demountable assembly. In this advantageous embodiment, each washing box is provided with its own shower set, but the high-pressure washing device includes only one common filter unit with one common high-pressure pump for all washing boxes.

In another preferred embodiment, the filter unit consists of a pair of parallel-connected first filters at the inlet equipped with a low-pressure pump. In this advantageous embodiment, the filter unit further consists of a second filter at the inlet equipped with a low-pressure pump and a third filter, also at the inlet equipped with a low-pressure pump. Filters and low-pressure pumps are interconnected by a low-pressure pipe.

The main advantage of the high-pressure washing device in question is that, by combining effective filtration with the described filter unit, using a high-pressure pump that exerts a pressure of partially polluted water above 16 MPa, and using a high-pressure washing nozzle with a conical mouth, it was possible to achieve almost 100% washing effect efficiency while at the same time significantly reducing the washing process by reducing the need for clean water and high environmental friendliness in relation to ecology and the production of polluted water.

CZ 36104 UI

Clarification of drawings

The technical solution will be explained in more detail with the help of drawings that show:

Giant. 1 schematic illustration of a high-pressure washing device in a design with three washing boxes, one shower set machine for each washing box, one high-pressure pump, and one filter unit consisting of two low-pressure pumps, three filters, one of each type, for the entire high-pressure washing device ,

Giant. 2 schematic representation of a high-pressure washing device in a design with a pair of washing boxes, with a pair of shower sets, one for each washing box, with three low-pressure pumps, with one high-pressure pump, but with a pair of parallel-laid first filters, with one second filter and with one third filter ,

Giant. 3 schematic representation of a high-pressure washing device in a version with one washing box, with a pair of shower sets for this washing box, with one high-pressure pump, and with one filter unit consisting of two low-pressure pumps, three filters, one of each type, for the entire high-pressure washing device .

Examples of implementing a technical solution

The high-pressure washing device 1 according to the illustration shown in Fig. 1 to 3 is primarily intended for removing stuck-on labels from washed objects, e.g. from crates, it consists of several components that can be connected to each other as needed, their number increased or, on the contrary, reduced and simplified exactly according to the requirements of the pressure washing process, and above all its intensity and the assumption of the amount and collected and separated impurities over time. The high-pressure washing device 1 is made up of at least one washing box 2 equipped with a conveyor device that enables the automatic movement of cleaned objects in the washing box 2. Furthermore, the high-pressure washing device 1 is made up of at least one shower set and at least one filter unit 6. The shower set consists of at least one high-pressure pump 3 located outside the washing box 2, to which at least one high-pressure pipe 4 penetrating the wall of the washing box 2 is connected to the inside. Inside the washing box 2, the high-pressure pipe 4 is then terminated by at least one high-pressure shower nozzle 5, which performs its own operation of removing labels from objects by washing. The filter unit 6, the washing box 2 and the shower set are connected to each other by a low-pressure pipe 8, through which the polluted water circulates during its removal from the washing box 2, the filtration process and after it is brought to the entrance of the shower set formed by at least one high-pressure pump 3. The low-pressure pipe 8 is fitted by at least one low-pressure pump 7, which ensures the flow of water through this low-pressure pipe 8 and the filter unit 6. The filter unit 6 of this high-pressure washing device 1 then consists of a trio of filters 9, 10, 11, which are arranged one behind the other in the direction of the flow of polluted water from the washing box 2. The first filter 9 is a drum filter for coarse particles equipped with a filter insert for the separation of particles larger than 400 pm. The second filter 10 is a drum filter of coarse particles equipped with a filter insert for the separation of particles larger than 50 µm. The third filter 11 is a bag filter equipped with a filter insert for the separation of particles larger than 50 µm. Its main task is to clean the polluted water before it enters the high-pressure pump 3, which is operationally very sensitive to the maximum size of solid impurities contained in the water passing through it. At the same time, the third filter 11 is also a fuse in case of low efficiency of the first filter 9 and/or the second filter 10 or in case of their damage. The high-pressure pump 3, which is part of the high-pressure washing device 1 and generates the required washing pressure of the filtered washing water, has an output pressure higher than 16 MPa.

According to one non-illustrated example of the implementation of the technical solution, the high-pressure pump has an output pressure in the range from 20 to 30 MPa. This pressure value proved to be optimal in tests for achieving the maximum washing effect and efficiency in removing stuck-on labels from washed objects. In tests, a washing efficiency of 99% was achieved.

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According to another non-illustrated example of the implementation of the technical solution, the shower set is equipped with several high-pressure shower nozzles 5 at the same time. These high-pressure shower nozzles 5 have a conical mouth, which ensures the conical shape of the water stream coming out of the high-pressure shower nozzle 5. This shape of the water stream best preserves the required pressure characteristics at the same time optimal coverage of the washed object with a stream of water, and thus the process of direct jet washing. According to this non-illustrated example of the implementation of the technical solution, the distance between two adjacent high-pressure shower nozzles 5 inside the washing box 2 is 100 to 150 mm when multiple high-pressure shower nozzles 5 are placed in the assembly of one shower set. The optimal distance of the high-pressure shower nozzle 5 from the washed object is, according to this example of the implementation of the technical solution, 150 to 250 mm.

According to the example of the implementation of the technical solution shown simultaneously in Fig. 1, 2 and 3, the third filter 11 is fitted with a first pressure measuring device 12 at its inlet and a second pressure measuring device 13 at its outlet. The first pressure measuring device 12 is used for sensing the amount of pressure on the low-pressure pipe 8 before entering the third filter 11. i.e. primarily for evaluating the functionality of the filtration taking place on the first filter 9 and the second filter 10. This enables early detection of excessive clogging of the first filter 9 and/or the second filter 10 and/or their damage, i.e. malfunction. The second pressure measuring device 13 is used to sense the amount of pressure on the low-pressure pipe 8 behind the third filter 11. This enables early detection of excessive clogging of the third filter 11 or its malfunction.

According to another non-illustrated example of the implementation of the technical solution, the first filter 9 and the second filter 10 are made of a casing made of stainless steel material and/or material with a stainless steel surface treatment. Inside the casing, it is rotatably supported by a separation drum made of stainless steel material and/or material with a stainless steel surface treatment. An expert in the field supplies a slightly large range of materials, both metallic and non-metallic, including possible variants of surface treatments preventing degradation of the shell or separation drum due to the influence of water, which can be used for the construction of the shell and separation drum. According to this example of the implementation of the technical solution, the separation drum is provided along its circumference with openings for the passage of water out of the separation drum into the inner cavity of the first filter 9 or the second filter 10 bounded by a casing. While the holes in the separation drum serve primarily for the simple flow of water, the inside of the separation drum is equipped with a replaceable filter insert, which is anchored to it from the inside with anchoring elements. The task of the filter element is mainly to separate solid impurities from the flowing water, where the effect of separation depends mainly on the roughness of the structure of the filter element.

According to another non-illustrated example of the implementation of the technical solution, the third filter 11 is formed by a casing made of stainless steel material and/or material with a stainless steel surface treatment, which is provided with an internal bag-shaped filter insert inside. An expert in the field supplies a slightly large range of materials, both metallic and non-metallic, including possible variants of surface treatments preventing degradation of the shell due to water, which can be used for the construction of the shell. The third filter 11 is provided with at least one input of polluted water and at least one output of filtered water according to this not shown example of the implementation of the technical solution. The polluted water flows through the entrance to the third JT filter, more precisely into the inner cavity of the filter insert. Subsequently, water with impurities below 50 µm passes through the walls of the filter insert, and larger impurities are captured by the filter insert in the same way as a bag in a vacuum cleaner captures impurities inside itself. The filtered water then exits the third filter 11 and continues to the high-pressure pump 3.

In another non-illustrated example of the implementation of the technical solution, the filter insert is made of textile material and/or plastic mesh. However, an expert in the field can easily supply other water-resistant materials whose structure is suitable or already used for filtering solid particles in liquids with the required separation effects, which can be used for the production of a separation insert. Ideally, the separation pad should be self-cleanable and reusable.

In the example of the implementation of the technical solution, shown in Fig. 1 to 2, the high-pressure washing device 1 includes at least two washing boxes 2 assembled into one demountable assembly. In this

-5CZ 36104 UI example of the implementation of the technical solution, each washing box 2 is equipped with its own shower set, but the high-pressure washing device 1 includes only one common filter unit 6 with one common high-pressure pump 3 for all washing boxes 2.

In the example of the implementation of the technical solution shown in Fig. 3, the high-pressure washing device includes one washing box 2. In this example of the implementation of the technical solution, the washing box 2 is equipped with two shower sets, but the high-pressure washing device 1 includes only one common filter unit 6 by one common high-pressure pump 3.

According to the implementation example of the technical solution shown in Fig. 2, the filter unit 6 consists of a pair of parallel-connected first filters 9. In this preferred embodiment, the filter unit 6 also consists of a second filter 10 at the inlet equipped with a low-pressure pump 7 and a third filter 11, also at the inlet equipped with a low-pressure pump 7. Filters 9, 10, 11 and low-pressure pumps 7 are interconnected by a low-pressure pipe.

Industrial applicability

The technical solution will find application in logistics for the optimal use of packaging materials, especially crates for multiple use, while simultaneously ensuring the marking standards of these crates with labels designed to identify the specific commodity stored in the crate and its subsequent removal with water savings and lower waste production.

Claims (9)

PROTECTION CLAIMS 1. High-pressure washing device (1) for removing labels from washed objects, e.g. crates, comprising at least one washing box (2) equipped with a conveyor device for moving washed objects, at least one shower set, consisting of at least one high-pressure pump (3) and at least one high-pressure pipe (4) connected to it, ending with at least one high-pressure shower nozzle (5), and further including at least one filter unit (6), while the washing box (2), filter unit (6) and shower set are connected to each other by a low-pressure pipeline (8) with at least one low-pressure pump (7), characterized by the fact that the filter unit (6) consists of three filters (9, 10, 11) arranged one behind the other in the direction of the flow of polluted water from the washing box (2), while the first filter (9) is a drum filter of coarse particles equipped with a filter insert for the separation of particles over 400 pm, the second filter (10) is a drum filter of coarse particles equipped with a filter insert for the separation of particles of a size of d 50 pm, and the third filter (11) is a bag filter equipped with a filter insert for the separation of particles larger than 50 pm, and that the high-pressure pump (3) has an output pressure higher than 16 MPa. 2. High-pressure washing device (1) according to claim 1, characterized in that the high-pressure pump (3) has an outlet pressure in the range from 20 to 30 MPa. 3. High-pressure washing device (1) according to claims 1 and 2, characterized in that the shower set is simultaneously equipped with several high-pressure shower nozzles (5) with a conical mouth for the conical output of pressurized filtered water, while the distance between two adjacent high-pressure shower nozzles ( 5) placed inside the washing box (2) is 100 to 150 mm. 4. High-pressure washing device (1) according to claims 1 to 3, characterized in that the third filter (11) is fitted with a first pressure measuring device (12) at its inlet and a second pressure measuring device (13) at its outlet. 5. High-pressure washing device (1) according to one of claims 1 to 4, characterized in that the first filter (9) and the second filter (10) are made of a casing made of stainless steel material and/or material with a stainless steel surface treatment with an internal rotationally mounted separation a drum made of stainless steel material and/or material with a stainless steel surface treatment, which is equipped with holes along its cylindrical circumference for the passage of water, while the inner side of the separation drum is equipped with a replaceable filter insert with anchoring elements anchored to the inner wall of the separation drum. 6. High-pressure washing device (1) according to one of claims 1 to 5, characterized in that the third filter (11) is made of a casing made of stainless steel material and/or material with a stainless steel surface treatment, which is provided with an internal bag-shaped filter insert inside , while the third filter (11) is provided with at least one input of polluted water and at least one output of filtered water, when the polluted water enters the cavity of the bag and passes through its walls free of larger impurities, the output of the filtered water leaves the third filter (11). -7 CZ 36104 UI 7. High-pressure washing device (1) according to claims 5 and 6, characterized in that the filter insert is made of textile material and/or plastic mesh. 8. High-pressure washing device (1) according to one of claims 1 to 7, characterized in that it includes at least two washing boxes (2) assembled into one demountable assembly, where each washing box (2) is equipped with its own shower set, while the high-pressure the washing device (1) includes only one common filter unit (6) with one common high-pressure pump (3) for all washing boxes (2). 9. High-pressure washing device (1) according to claim 7, characterized in that the filter unit (6) 5 consists of a pair of parallel-connected first filters (9), a second filter (10) at the inlet equipped with a low-pressure pump (7) and one third filter (11) at the inlet equipped with a low-pressure pump (7) interconnected by low-pressure pipes (8).