Machine head for vacuum drying machine

Abstract

The vacuum dryer comprises a plurality of platens which are sequentially stacked from top to bottom, heating flow channels are arranged in the platens, a vacuum cover is further arranged on the platens located on the uppermost side, and the machine head comprises liquid supply branch pipes and liquid drainage branch pipes which are communicated with the heating flow channels of the platens in a one-to-one correspondence mode; two heat exchange media which are used in a switching mode and have different temperatures circulate in the liquid supply branch pipes and are defined as the first heat exchange medium and the second heat exchange medium respectively, and the temperature of the second heat exchange medium is higher than that of the first heat exchange medium. According to the invention, two heat exchange media with different temperatures circulate in the liquid supply branch pipes, the corresponding bedplate is selected to switch the heat exchange media with different temperatures according to the opening condition of the vacuum cover or the bedplate, and the heat loss is made up through the high-temperature heat exchange media, so that a good drying effect is ensured, and the heat exchange efficiency is improved. The drying time does not need to be prolonged, and the drying efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of leather drying, in particular to a head for a vacuum drying machine. Background Art

[0002] When using a vacuum dryer to dry leather, first, hot steam is needed to heat the leather to evaporate the moisture in the leather. This process requires the use of components such as heaters and heating pipes. Secondly, after the moisture in the leather evaporates, the evaporated water vapor needs to be promptly extracted by vacuuming. This process requires the use of vacuum pumps, condensers, vacuum pipes, separation barrels, oil-water separators and other components. During the entire drying process, many components are required and the arrangement is relatively messy, so it will take up a lot of space and site. In addition, when a component or pipeline has a problem, it is also more troublesome to repair it.

[0003] In response to the above phenomenon, patent CN209522859U proposes a vacuum dryer head, which includes a mounting frame, on which a first vertical mounting area, a second vertical mounting area and a third vertical mounting area are distributed in parallel; a vacuum branch pipe and a first-level sewage bucket are installed in the first vertical mounting area; a condenser, a heater, a water inlet main pipe and a water outlet main pipe are installed in the second vertical mounting area; a Roots pump, a vacuum pump, a second-level sewage bucket, a separation bucket and an oil-water separator are installed in the third vertical mounting area.

[0004] When the above-mentioned machine head is used in conjunction with a vacuum dryer, the water inlet main pipe, water inlet branch pipe, water outlet main pipe and water outlet branch pipe are used to provide heat exchange medium (hot water) for each platen of the vacuum dryer so as to heat and dry the leather placed on the platen. Existing vacuum dryers all have several layers of stacked platens. Adjacent platens are fitted with sealing rings and other components to form a sealed drying chamber between the upper and lower plates, which contains the leather for vacuum extraction and heating and drying. However, when drying leather, not all the leather is placed on each platen at once and then a heat exchange medium is introduced for heating and drying. Instead, the heat exchange medium is introduced as soon as a piece of leather is placed. This operating mode allows for continuous production and reduces waiting time for loading and unloading leather. However, this also presents another problem. In the existing heating mode, a single water inlet main pipe is used to supply the heat exchange medium to all the platens. This means that the temperature of the heat exchange medium is fixed, while the temperature of the drying chamber or the temperature of the platen surface is also provided by the heat exchange medium. When the previous piece of leather on the platen is dried and the next piece of leather is replaced, the upper platen must be opened to replace the leather. This process causes heat loss in the drying chamber, lowering the temperature. This requires extending the drying time to ensure the drying effect of the leather, thereby reducing production efficiency. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a vacuum drying machine head which can reduce the drying time while ensuring the leather drying effect.

[0006] To solve the above technical problems, the present invention provides a technical solution: a head for a vacuum dryer, the vacuum dryer comprising a plurality of platens stacked in sequence from top to bottom, each platen having a heating flow channel therein, and a vacuum cover disposed on the uppermost platen. The innovation of the head is that the head includes a liquid supply branch pipe and a liquid discharge branch pipe connected to the heating flow channel of each platen in a one-to-one correspondence; Two heat exchange media of different temperatures are switched and circulated in the liquid supply branch pipe, and are defined as a first heat exchange medium and a second heat exchange medium, respectively, and the temperature of the second heat exchange medium is higher than that of the first heat exchange medium; The vacuum cover and each platen are defined as opening and closing part 1, opening and closing part 2, ... opening and closing part N from top to bottom, where N is an integer ≥ 3; During normal drying, the first heat exchange medium flows through the liquid supply branch pipes connected to each platen; When loading and unloading leather, the opening and closing parts that need to move are defined as M, and 1≤M≤N-1. The second heat exchange medium flows in the liquid supply branch pipe connected to the opening and closing part M-1, and the first heat exchange medium still flows in the liquid supply branch pipes connected to the remaining other plates.

[0007] Furthermore, the machine head also includes a first liquid supply main pipe and a second liquid supply main pipe, and each of the liquid supply branches is connected to the first liquid supply main pipe and the second liquid supply main pipe.

[0008] Furthermore, the connection between the first liquid supply main pipe, the second liquid supply main pipe and the liquid supply branch pipe is as follows: a first liquid supply connecting pipe corresponding to each liquid supply branch pipe is provided on the first liquid supply main pipe, and a second liquid supply connecting pipe corresponding to each liquid supply branch pipe is provided on the second liquid supply main pipe, and the first liquid supply connecting pipe and the second liquid supply connecting pipe connected to the same liquid supply branch pipe are connected to the liquid supply branch pipe through a first three-way joint, and the first liquid supply connecting pipe and the second liquid supply connecting pipe are also provided with a first liquid supply valve and a second liquid supply valve, respectively.

[0009] Furthermore, the machine head further includes a first liquid drainage main pipe and a second liquid drainage main pipe, and each liquid drainage branch pipe is connected to the first liquid drainage main pipe and the second liquid drainage main pipe.

[0010] Furthermore, the connection between the first drainage main pipe, the second drainage main pipe and the drainage branch pipe is as follows: a first drainage connecting pipe corresponding to each drainage branch pipe is provided on the first drainage main pipe, and a second drainage connecting pipe corresponding to each drainage branch pipe is provided on the second drainage main pipe, and the first drainage connecting pipe and the second drainage connecting pipe connected to the same drainage branch pipe are connected to the drainage branch pipe through a second three-way joint, and the first drainage connecting pipe and the second drainage connecting pipe are also provided with a first drainage valve and a second drainage valve.

[0011] The advantages of the present invention are as follows: in the present invention, by adopting two heat exchange media with different temperatures circulating in the liquid supply branch pipe, the corresponding platen is selected to switch the heat exchange media with different temperatures according to the opening status of the vacuum cover or the platen, and the heat loss is compensated by the high-temperature heat exchange medium, which not only ensures a good drying effect, but also does not require to extend the drying time, thereby improving the drying efficiency.

[0012] The first liquid supply main pipe and the second liquid supply main pipe are used to cooperate with each liquid supply branch pipe, and cooperate with the opening and closing of different valves, so as to realize the circulation of heat exchange media with different temperatures in the same liquid supply branch pipe.

[0013] In addition, the first drainage main pipe and the second drainage main pipe are used to cooperate with each drainage branch pipe, so as to cooperate with two heat exchange media of different temperatures, so that the heat exchange media of different temperatures are discharged through different drainage main pipes, which provides a basis for the subsequent recycling of heat exchange media of different temperatures and avoids the mutual influence of heat exchange media of different temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1It is a schematic diagram of a vacuum drying machine head of the present invention.

[0015] Figure 2 It is a front view of the vacuum drying machine head of the present invention.

[0016] Figure 3 This is a schematic diagram of the coordination between the liquid supply main pipe and the liquid discharge main pipe in the present invention.

[0017] Figure 4 It is a front view of the cooperation between the liquid supply main pipe and the liquid discharge main pipe in the present invention. DETAILED DESCRIPTION

[0018] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0019] like Figure 1-Figure 4 The head of a vacuum dryer shown in the figure includes several table plates stacked in sequence from top to bottom, with heating flow channels inside the table plates, and a vacuum cover is also provided on the topmost table plate. The head includes a frame 1, a liquid supply main pipe, a liquid supply branch pipe, a liquid discharge branch pipe and a liquid discharge main pipe.

[0020] There are several liquid supply branch pipes and liquid discharge branch pipes, which are connected to the heating flow channels of each platen one by one to realize the circulation of heat exchange medium.

[0021] Two heat exchange media with different temperatures are switched and circulated in the liquid supply branch pipe, and are defined as a first heat exchange medium and a second heat exchange medium, respectively. The temperature of the second heat exchange medium is higher than that of the first heat exchange medium.

[0022] The vacuum cover and each platen are defined as opening and closing part 1, opening and closing part 2, ..., opening and closing part N from top to bottom, where N is an integer ≥3.

[0023] During normal drying, the first heat exchange medium flows through the liquid supply branch pipes connected to each platen.

[0024] When loading and unloading leather, the opening and closing parts that need to move are defined as M, and 1≤M≤N-1. The second heat exchange medium flows in the liquid supply branch pipe connected to the opening and closing part M-1, and the first heat exchange medium still flows in the liquid supply branch pipes connected to the remaining other plates.

[0025] The liquid supply main includes a first liquid supply main 2 and a second liquid supply main 3, and each liquid supply branch pipe is connected to the first liquid supply main 2 and the second liquid supply main 3. The first liquid supply main 2 and the second liquid supply main 3 are respectively connected to heat exchange medium sources of different temperatures, and the heat exchange medium is pumped into the first liquid supply main 2 or the second liquid supply main 3 by the heat exchange medium source.

[0026] The connection between the first liquid supply main pipe 2, the second liquid supply main pipe 3 and the liquid supply branch pipes is as follows: a first liquid supply pipe 21 corresponding to each liquid supply branch pipe is provided on the first liquid supply main pipe 2, and a second liquid supply pipe 31 corresponding to each liquid supply branch pipe is provided on the second liquid supply main pipe 3. The first liquid supply pipe 21 and the second liquid supply pipe 31 connected to the same liquid supply branch pipe are connected to the liquid supply branch pipe via a first three-way joint 11. A first liquid supply valve 22 and a second liquid supply valve 32 are also provided on the first liquid supply pipe 21 and the second liquid supply pipe 31, respectively.

[0027] The drainage main pipe includes a first drainage main pipe 5 and a second drainage main pipe 4, and each drainage branch pipe is connected to the first drainage main pipe 5 and the second drainage main pipe 4. The first drainage main pipe 5 and the second drainage main pipe 4 are respectively connected to heat exchange medium sources of different temperatures, and the used heat exchange medium is returned to the heat exchange medium source by pumping.

[0028] The connection between the first drainage main pipe 5, the second drainage main pipe 4, and the drainage branch pipes is as follows: a first drainage pipe 51 corresponding to each drainage branch pipe is provided on the first drainage main pipe 5, and a second drainage pipe 41 corresponding to each drainage branch pipe is provided on the second drainage main pipe 4. The first drainage pipe 51 and the second drainage pipe 41 connected to the same drainage branch pipe are connected to the drainage branch pipe via a second three-way joint 12. A first drainage valve 52 and a second drainage valve 42 are also provided on the first drainage pipe 51 and the second drainage pipe 41. The first drainage main pipe 5 and the second drainage main pipe 4 are used to cooperate with each drainage branch pipe to cooperate with two heat exchange media of different temperatures, so that the heat exchange media of different temperatures are discharged through different drainage main pipes, providing a basis for the subsequent recycling of heat exchange media of different temperatures and preventing the heat exchange media of different temperatures from affecting each other.

[0029] The first liquid supply main pipe 2 is connected to the first liquid discharge main pipe 5 via a first circulation pipe 7, and the second liquid supply main pipe 3 is connected to the second liquid discharge main pipe 4 via a second circulation pipe 6, thereby achieving the circulation of the heat exchange medium. Heating pipes 10 are also provided on the outer walls of the first circulation pipe 7 and the second circulation pipe 6. A first liquid supply pump 9 is also provided between the first circulation pipe 7 and the first liquid supply main pipe 2, and a second liquid supply pump 8 is provided between the second circulation pipe 6 and the second liquid supply main pipe 3. Through the coordination of the first circulation pipe 7 and the second circulation pipe 6, and the provision of the heating pipe 10, the heat exchange medium discharged from the heating flow channel of the platen can be heated and then recycled.

[0030] Working principle: First, during normal drying, after the leather is laid on the table, heating begins. At this time, the heat exchange medium source first passes the low-temperature first heat exchange medium into the first liquid supply main pipe 2, then opens the first liquid supply valve 22, closes the second liquid supply valve 32, and the first heat exchange medium in the first liquid supply main pipe 2 flows into the liquid supply branch pipe, and flows from the liquid supply branch pipe into the heating flow channel of the table to achieve low-temperature heating of the leather. Then, the first heat exchange medium flows from the heating flow channel into the drain branch pipe, and at the same time, the first drain valve 52 is opened in advance and the second drain valve is closed. Door 42 allows the first heat exchange medium in the drainage branch pipe to flow into the first drainage main pipe 5. If the heating and drying of the leather has been completed, the first heat exchange medium in the first drainage main pipe 5 flows back to the corresponding heat exchange medium source. If the leather still needs to be heated and dried, the first heat exchange medium in the first drainage main pipe 5 flows into the first circulation pipe 7 and is sent to the first liquid supply main pipe 2 for circulation via the first liquid supply pump 9. At the same time, the corresponding heating pipe 10 is used to heat and increase the temperature of the circulating first heat exchange medium to ensure the temperature of the first heat exchange medium sent to the first liquid supply main pipe 2.

[0031] When the previous leather on the table is dried and needs to be replaced, the table on the upper layer is opened upwards first (if it is the top table, the vacuum cover is opened). At this time, the first liquid supply valve 22 is closed, the second liquid supply valve 32 is opened, the first liquid discharge valve 52 is closed, and the second liquid discharge valve 42 is opened. A high-temperature second heat exchange medium is introduced into the second liquid supply main pipe 3 from a heat exchange medium source of another temperature. The second heat exchange medium flows from the second liquid supply main pipe 3 into the liquid supply branch pipe, and then flows from the liquid supply branch pipe into the heating flow channel of the table, achieving high temperature of the table. Heating to make up for the heat loss, then the second heat exchange medium flows from the heating flow channel into the drainage branch pipe, and then into the second drainage main pipe 4. Similarly, if the upper platen or vacuum cover is not re-closed, it means that the second heat exchange medium needs to be recycled. The second heat exchange medium in the second drainage main pipe 4 flows into the second circulation pipe 6 and is sent to the second liquid supply main pipe 3 by the second liquid supply pump 8 for circulation. At the same time, the corresponding heating pipe 10 is used to heat the circulating second heat exchange medium to ensure the temperature of the second heat exchange medium sent to the second liquid supply main pipe 3. When the upper table or vacuum cover is closed again, the second heat exchange value is no longer needed for heating, and the heat exchange medium in the second liquid discharge main pipe 4 flows to the corresponding heat exchange medium source. At the same time, the first liquid supply valve 22 is opened, the second liquid supply valve 32 is closed, the first liquid discharge valve 52 is opened, and the second liquid discharge valve 42 is closed, and the first heat exchange medium continues to flow into the heating flow channel of the table to heat the leather at a low temperature.

[0032] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A head for a vacuum dryer, comprising a plurality of platens stacked in sequence from top to bottom, with heating channels within the platens and a vacuum cover disposed on the uppermost platen, characterized in that: The machine head includes a liquid supply branch pipe and a liquid discharge branch pipe which are connected to the heating flow channels of each platen in a one-to-one correspondence; Two heat exchange media of different temperatures are switched and circulated in the liquid supply branch pipe, and are defined as a first heat exchange medium and a second heat exchange medium, respectively, and the temperature of the second heat exchange medium is higher than that of the first heat exchange medium; The vacuum cover and each platen are defined as opening and closing part 1, opening and closing part 2, ... opening and closing part N from top to bottom, where N is an integer ≥ 3; During normal drying, the first heat exchange medium flows through the liquid supply branch pipes connected to each platen; When loading and unloading leather, the opening and closing parts that need to move are defined as M, and 1≤M≤N-1. The second heat exchange medium flows in the liquid supply branch pipe connected to the opening and closing part M-1, and the first heat exchange medium still flows in the liquid supply branch pipes connected to the remaining other plates.

2. The vacuum drying machine head according to claim 1, wherein: The machine head further comprises a first liquid supply main pipe and a second liquid supply main pipe, and each of the liquid supply branches is connected to the first liquid supply main pipe and the second liquid supply main pipe.

3. The vacuum drying machine head according to claim 2, wherein: The connection between the first liquid supply main pipe, the second liquid supply main pipe and the liquid supply branch pipes is as follows: a first liquid supply connecting pipe corresponding to each liquid supply branch pipe is provided on the first liquid supply main pipe, and a second liquid supply connecting pipe corresponding to each liquid supply branch pipe is provided on the second liquid supply main pipe, and the first liquid supply connecting pipe and the second liquid supply connecting pipe connected to the same liquid supply branch pipe are connected to the liquid supply branch pipe via a first three-way joint, and the first liquid supply connecting pipe and the second liquid supply connecting pipe are also provided with a first liquid supply valve and a second liquid supply valve, respectively.

4. The vacuum drying machine head according to claim 1, wherein: The machine head further comprises a first liquid drainage main pipe and a second liquid drainage main pipe, and each liquid drainage branch pipe is connected to the first liquid drainage main pipe and the second liquid drainage main pipe.

5. The vacuum drying machine head according to claim 4, characterized in that: The connection between the first drainage main pipe, the second drainage main pipe and the drainage branch pipe is as follows: a first drainage connecting pipe corresponding to each drainage branch pipe is provided on the first drainage main pipe, and a second drainage connecting pipe corresponding to each drainage branch pipe is provided on the second drainage main pipe, and the first drainage connecting pipe and the second drainage connecting pipe connected to the same drainage branch pipe are connected to the drainage branch pipe through a second three-way joint, and the first drainage connecting pipe and the second drainage connecting pipe are also provided with a first drainage valve and a second drainage valve.

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