High-water-absorption moisturizing tissue pulping equipment

Abstract

The invention relates to the technical field of paper towel production, in particular to high-water-absorption moisturizing paper towel pulping equipment which comprises a pulping chamber for feeding and discharging pulp, at least one millstone rotationally connected into the pulping chamber and a millstone motor for driving the millstone to rotate, and a hollow cooling plate is arranged in the pulping chamber. The cooling plate is communicated with a normal-temperature unit which pumps cooling fluid into the cooling plate to reduce the temperature of the pulp, a feeding temperature sensor is arranged at the feeding port of the pulp grinding chamber, a discharging temperature sensor is arranged at the discharging port of the pulp grinding chamber, and the normal-temperature unit, the feeding temperature sensor and the discharging temperature sensor are electrically connected with a controller; the temperature of the slurry before and after grinding is obtained in real time, and the temperature of the cooling plate is adjusted so that the temperature of the slurry cannot be too high easily.

Description

Technical Field

[0001] The present application relates to the field of tissue production technology, and particularly to a pulping device for highly absorbent and moisture-retaining tissues. Background Art

[0002] During the production of tissues, the prepared pulp needs to be pulped to refine the fibers in the pulp. Especially for moisture-retaining tissues with high water absorption requirements, higher refinement of the fibers is required to further improve the water absorption of the tissues.

[0003] Existing tissue pulping devices often use disc refiners. A disc refiner generally performs pulping by the rotation of at least one grinding disc. For example, a double-disc refiner for paper product production with the publication number CN211227845U.

[0004] In view of the above related technologies, in order to perform pulping with higher efficiency, the rotation speed of the grinding disc will be relatively fast. At a relatively fast rotation speed of the grinding disc, the temperature of the pulp is likely to rise. Once the temperature of the pulp is too high, the fibers will break, reducing the fiber strength, and then affecting the water absorption of the tissues. Summary of the Invention

[0005] In order to reduce the impact on the water absorption of tissues, the present application provides a pulping device for highly absorbent and moisture-retaining tissues.

[0006] The pulping device for highly absorbent and moisture-retaining tissues provided by the present application adopts the following technical solutions.

[0007] A pulping device for highly absorbent and moisture-retaining tissues includes a pulping chamber for the entry and exit of pulp, at least one grinding disc rotatably connected in the pulping chamber, and a grinding disc motor for driving the grinding disc to rotate. A cooling plate with a hollow interior is provided in the pulping chamber. The cooling plate is connected to a normal temperature unit that pumps a cooling fluid into the cooling plate to reduce the temperature of the pulp. A feed temperature sensor is provided at the feed inlet of the pulping chamber and a discharge temperature sensor is provided at the discharge outlet. The normal temperature unit, the feed temperature sensor, and the discharge temperature sensor are electrically connected to a controller.

[0008] By adopting the above technical solutions, the temperature of the pulp before and after pulping can be controlled to prevent the temperature of the pulp before and after pulping from being too high, and the cooling plate can cool the pulp in time, so that the water absorption of the finally formed pulp is not easily affected greatly.

[0009] Optionally, the pulping chamber includes a front chamber, a middle chamber, and a rear chamber that are connected. The front chamber is for the entry of pulp and the rear chamber is for the exit of pulp. A set of grinding discs is provided between the front chamber and the middle chamber and between the rear chamber and the middle chamber. The cooling plate is located in the middle chamber.

[0010] By adopting the above technical solution, after the slurry is ground in the front cavity, it is cooled through the middle cavity and then enters the rear cavity for grinding, enabling the grinding disc to rotate at a higher speed, so as to further complete the grinding in a relatively short time and improve the efficiency of the slurry grinding.

[0011] Optionally, the cooling plates are arranged in two staggered rows. Several cooling plates are arranged in each row along the direction of the connection line between the center point of the front cavity and the center point of the rear cavity. At least one end of the cooling plates in each row is located between two adjacent cooling plates in the other row.

[0012] By adopting the above technical solution, the whole slurry can be cooled more sufficiently between the two rows of cooling plates, and it is not easy for a certain part of the slurry to be insufficiently cooled, resulting in too high a temperature during the grinding process in the rear cavity, reducing the possibility of uneven water absorption of the paper towels produced in the same batch finally.

[0013] Optionally, an inner front temperature sensor electrically connected to the controller is provided at a position near the cooling plates in the front cavity, and an inner rear temperature sensor electrically connected to the controller is provided at a position near the cooling plates in the rear cavity.

[0014] By adopting the above technical solution, the temperature of the slurry sent out from the front cavity and the temperature of the slurry cooled through the middle cavity can be detected in real time to ensure that the temperature of the slurry during grinding in the rear cavity is not too high.

[0015] Optionally, the temperature value detected by the inner rear temperature sensor is T 内后 , and the temperature value detected by the feed temperature sensor is T 料 , and the temperature of the cooling plates is controlled so that T 内后 ≤T 料 .

[0016] By adopting the above technical solution, during the process of grinding the slurry twice in the front cavity and the rear cavity, it is further ensured that the temperature of the slurry is not too high, and it is also convenient to analyze and judge which grinding link in the front cavity and the rear cavity has problems when the temperature of the slurry sent out from the rear cavity is abnormal.

[0017] Optionally, the housing of the front cavity is detachably connected to the housing of the middle cavity, and the housing of the rear cavity is detachably connected to the housing of the middle cavity. Each set of grinding discs includes an inner disc rotatably connected to the middle cavity and an outer disc rotatably connected to the front cavity or the rear cavity. The rotation directions of the adjacent inner disc and outer disc are opposite.

[0018] By adopting the above technical solution, after the front cavity and the rear cavity are removed, it is convenient to check and maintain the two sets of grinding discs, and the slurry can also be ground comprehensively and sufficiently in a shorter time.

[0019] Optionally, there is a cooling disc between the inner disc and the outer disc, through which the cooling fluid sent by the normal-temperature unit can enter.

[0020] By adopting the above technical solution, the temperature of the slurry during the pulping process can be further controlled to monitor the temperature of the slurry during the pulping process.

[0021] Optionally, the cooling disc is detachably connected to the middle cavity, and the cooling disc is provided with a disc opening through which the slurry can pass.

[0022] By adopting the above technical solution, the slurry can pass through the disc opening, so that the contact area between the slurry and the cooling disc is larger, the cooling effect on the slurry is better, and the pulping effect on the slurry is also more sufficient.

[0023] Optionally, a set of support members is fixedly connected in each disc opening, and each set of support members is arranged along the length direction of the disc opening, and the length direction of the support members is perpendicular to the length direction of the disc opening.

[0024] By adopting the above technical solution, even if the disc opening is provided on the cooling disc, a certain structural strength can be maintained, so that the cooling disc is not easily deformed or damaged when the cooling disc cooperates with the grinding disc for pulping.

[0025] Optionally, a normal temperature value T1, a controllable temperature value T2, and an overload temperature value T3 are preset in the controller, the temperature value detected by the discharge temperature sensor is T 测 , and the temperature value detected by the feed temperature sensor is T 料 ; if T 测 < T1, the temperature of the cooling fluid sent by the normal-temperature unit is maintained at 2 T 料 -T 测 ; if T1 ≤ T 测 < T2, the temperature of the cooling fluid sent by the normal-temperature unit is maintained at 3 T 料 -2 T 测 ; if T2 ≤ T 测 < T3, the temperature of the cooling fluid sent by the normal-temperature unit is maintained at 5 T 料 -4 T 测 ; if T 测 ≥ T3, stop for inspection.

[0026] By adopting the above technical solution, the temperature of the slurry can be more carefully monitored to further reduce the possibility of the slurry temperature being too high.

[0027] In summary, the present application has at least the following beneficial effects.

[0028] Control the slurry temperature before and after pulping to prevent the slurry temperature from being too high before and after pulping, and have a cooling plate to cool the slurry in time, so that the water absorption of the finally formed pulp is not easily affected greatly. Description of the Drawings

[0029] Figure 1 is a schematic cross-sectional structure diagram of the pulping chamber; Figure 2 is a partial control system block diagram of the present application; Figure 3 is a schematic structure diagram of the cooling plate; Figure 4 is a logic block diagram of the present application for controlling the temperature of the slurry.

[0030] Description of the reference numerals: 1, pulping chamber; 2, grinding disc; 3, grinding disc motor; 4, cooling plate; 41, outer disc; 42, cooling plate; 43, plate opening; 44, support member; 5, normal temperature unit; 51, feed temperature sensor; 52, discharge temperature sensor; 53, controller; 54, front chamber; 55, rear chamber; 56, inner front temperature sensor; 57, inner rear temperature sensor; 58, middle chamber; 59, inner side disc. Detailed Description of the Embodiment

[0031] The present application will be further described in detail below with reference to the drawings.

[0032] The embodiment of the present application discloses a high water absorption and moisture retention tissue paper pulping device. Referring to Figure 1 and Figure 2 , it includes a pulping chamber 1. Two groups of grinding discs 2 are installed in the pulping chamber 1 in the slurry flow direction. A grinding disc motor 3 for driving the grinding disc 2 to rotate is installed outside the pulping chamber 1. A cooling plate 4 is also installed in the pulping chamber 1. The cooling plate 4 is connected to a normal temperature unit 5 that can send out cooling water at 0-80°C. The slurry enters the pulping chamber 1 for pulping.

[0033] Referring to Figure 1, the pulping chamber 1 includes a front chamber 54, a rear chamber 55 and a middle chamber 58. The two ends of the middle chamber 58 are open and are flange-connected and communicated with the front chamber 54 and the rear chamber 55 respectively. The pulp enters from the front chamber 54 and is sent out from the rear chamber 55. Each set of grinding discs 2 includes an inner disc 59 and an outer disc 41. The inner disc 59 is rotatably connected to the middle chamber 58, and the outer disc 41 is rotatably connected to the corresponding front chamber 54 or rear chamber 55. A grinding disc motor 3 is correspondingly arranged for each inner disc 59 and each outer disc 41 and is driven by means of a synchronous belt and a synchronous pulley. Moreover, the rotation directions of the inner disc 59 and the outer disc 41 of the same set of grinding discs 2 are opposite. Removable cooling discs 42 are connected to the two open ends of the middle chamber 58. One cooling disc 42 is located between the inner disc 59 and the outer disc 41 of the same set of grinding discs 2. The cooling disc 42 is also communicated with the normal temperature unit 5 so that cooling water is fed into the cooling disc 42 to control the temperature of the pulp during the pulping process.

[0034] Refer to Figure 1 and Figure 3 , a plurality of disc openings 43 are formed through the cooling disc 42. A set of support members 44 are fixedly connected in each disc opening 43. The length direction of the support members 44 is perpendicular to the length direction of the disc opening 43. The pulp located between the inner disc 59 and the outer disc 41 can pass through the disc opening 43 to improve the cooling effect on the pulp. In addition, two rows of cooling plates 4 are fixedly connected in the middle chamber 58. A plurality of cooling plates 4 are arranged in each row along the direction connecting the center points of the front chamber 54 and the rear chamber 55. At least one end of the cooling plates 4 in each row is located between two adjacent cooling plates 4 in the other row so that the pulp flows in a serpentine manner between the two rows of cooling plates 4.

[0035] Refer to Figure 2 and Figure 4 , a feed temperature sensor 51 is detachably connected to the opening for the pulp to enter inside the front chamber 54. An inner front temperature sensor 56 is detachably connected to the position where the front chamber 54 is communicated with the middle chamber 58. An inner rear temperature sensor 57 is detachably connected to the position where the rear chamber 55 is communicated with the middle chamber 58. A discharge temperature sensor 52 is detachably connected to the opening for the pulp to be sent out inside the rear chamber 55. The normal temperature unit 5, the feed temperature sensor 51, the inner front temperature sensor 56, the inner rear temperature sensor 57 and the discharge temperature sensor 52 are all electrically connected to a controller 53. Moreover, the temperature value detected by the discharge temperature sensor 52 is T 测 , the temperature value detected by the feed temperature sensor 51 is T 料 , a normal temperature value T1, a controllable temperature value T2 and an overload temperature value T3 are preset in the controller 53, T1 < T2 < T3, and T3 is the temperature threshold at which the water absorbency of the pulp after making paper towels is not affected. If T 测 < T1, the temperature of the cooling fluid sent out by the normal temperature unit 5 is maintained at T 料 - (T 测 - T料 ), that is, 2 T 料 -T 测 ; If T1 ≤ T 测 <T2, then the temperature of the cooling fluid sent by the normal temperature unit 5 is maintained at T 料 -2 (T 测 - T 料 ), that is, 3 T 料 -2 T 测 ; If T2 ≤ T 测 <T3, then the temperature of the cooling fluid sent by the normal temperature unit 5 is maintained at T 料 -4 (T 测 - T 料 ), that is, 5 T 料 -4 T 测 ; If T 测 ≥T3, then stop for inspection.

[0036] In addition, the temperature value detected by the inner rear temperature sensor 57 is T 内后 , control T 内后 ≤T 料 , so that when the slurry is ground in the rear cavity 55, the temperature is not likely to be too high.

[0037] The implementation principle of a high water absorption and moisture retention tissue paper pulping device according to an embodiment of the present application is as follows: During the pulping process, the slurry will be cooled by the cooling disc 42, and after the slurry is ground in the front cavity 54, it will enter the middle cavity 58 for cooling, and the cooled slurry will then enter the rear cavity 55 for secondary pulping, which not only ensures that the temperature of the slurry is not likely to be too high under the high-speed rotation of the grinding disc 2, but also can fully pulp the slurry.

[0038] The above are all the preferred embodiments of the present application. The protection scope of the present application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A high water-absorbing and moisture-retaining tissue pulp grinding device, comprising a grinding chamber (1) for feeding and discharging pulp, at least one grinding disc (2) rotatably connected inside the grinding chamber (1), and a grinding disc motor (3) for driving the grinding disc (2) to rotate, characterized in that: A cooling plate (4) with a hollow interior is provided in the pulping chamber (1). The cooling plate (4) is connected to a normal temperature unit (5) that pumps a cooling fluid into the cooling plate (4) to reduce the temperature of the pulp. A feed temperature sensor (51) is provided at the feed inlet of the pulping chamber (1), and a discharge temperature sensor (52) is provided at the discharge outlet. The normal temperature unit (5), the feed temperature sensor (51), and the discharge temperature sensor (52) are electrically connected to a controller (53).

2. The pulp grinding equipment for a highly water-absorbent and moisture-retaining tissue paper according to claim 1, characterized in that: The pulping chamber (1) includes a front chamber (54), a middle chamber (58), and a rear chamber (55) that are connected and communicate with each other. The front chamber (54) is for the pulp to enter, and the rear chamber (55) is for the pulp to be sent out. A set of grinding discs (2) is provided between the front chamber (54) and the middle chamber (58) and between the rear chamber (55) and the middle chamber (58). The cooling plate (4) is located in the middle chamber (58).

3. A high water-absorbing and moisture-retaining tissue pulping device according to claim 2, characterized in that: The cooling plates (4) are arranged in two rows with a dislocation. Several cooling plates (4) in each row are arranged along the direction connecting the center points of the front chamber (54) and the rear chamber (55). At least one end of the cooling plates (4) in each row is located between two adjacent cooling plates (4) in the other row.

4. A high water-absorbing and moisture-retaining tissue pulping device according to claim 2, characterized in that: An inner front temperature sensor (56) electrically connected to the controller (53) is provided at a position of the front chamber (54) close to the cooling plate (4), and an inner rear temperature sensor (57) electrically connected to the controller (53) is provided at a position of the rear chamber (55) close to the cooling plate (4).

5. A pulp refining device for a highly water-absorbent and moisture-retaining paper towel according to claim 4, characterized in that: The temperature value detected by the inner rear temperature sensor (57) is T 内后 , and the temperature value detected by the feed temperature sensor (51) is T 料 , control the temperature of the cooling plate (4) so that T 内后 ≤T 料 .

6. A high water-absorbing and moisture-retaining tissue paper pulping device according to claim 2, characterized in that: The housing of the front chamber (54) is detachably connected to the housing of the middle chamber (58), and the housing of the rear chamber (55) is detachably connected to the housing of the middle chamber (58). Each set of grinding discs (2) includes an inner disc (59) rotatably connected to the middle chamber (58) and an outer disc (41) rotatably connected to the front chamber (54) or the rear chamber (55). The rotation directions of the adjacent inner disc (59) and outer disc (41) are opposite.

7. A high water-absorbing and moisture-retaining tissue paper pulping device according to claim 6, characterized in that: There is a cooling disc (42) between the inner disc (59) and the outer disc (41) for the cooling fluid sent out by the normal temperature unit (5) to enter.

8. A high water-absorbing and moisture-retaining tissue pulping device according to claim 7, characterized in that: The cooling disc (42) is detachably connected to the middle chamber (58), and the cooling disc (42) is provided with a disc opening (43) through which the pulp passes.

9. A high water-absorbing and moisture-retaining tissue pulping device according to claim 8, characterized in that: A set of support members (44) is fixedly connected in each disc opening (43). Each set of support members (44) is arranged along the length direction of the disc opening (43), and the length direction of the support members (44) is perpendicular to the length direction of the disc opening (43).

10. A pulp grinding device for a highly water-absorbent and moisture-retaining tissue paper according to claim 1, characterized in that: The controller (53) is preset with a normal temperature value T1, a controllable temperature value T2, and an overload temperature value T3. The temperature value detected by the discharge temperature sensor (52) is T 测 , and the temperature value detected by the feed temperature sensor (51) is T 料 ; If T 测 < T1, the temperature of the cooling fluid sent by the normal temperature unit (5) is maintained at 2 T 料 - T 测 ; If T1 ≤ T 测 < T2, the temperature of the cooling fluid sent by the normal temperature unit (5) is maintained at 3 T 料 - 2 T 测 ; If T2 ≤ T 测 < T3, the temperature of the cooling fluid sent by the normal temperature unit (5) is maintained at 5 T 料 - 4 T 测 ; If T 测 ≥ T3, stop the machine for inspection.

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