Improved headbox nozzle lip plate temperature control device

Abstract

The utility model discloses an improved headbox nozzle lip plate temperature control device which comprises a headbox, an upper lip plate, a lower lip plate and a hot water supply system, the upper lip plate and the lower lip plate are arranged at the upper end and the lower end of a pulp outlet of the headbox, and an upper lip plate outer hot water interlayer and an upper lip plate inner hot water interlayer are arranged on the upper surface of the upper lip plate at intervals. A lower lip plate outer hot water interlayer and a lower lip plate inner hot water interlayer are arranged on the lower surface of the lower lip plate at intervals; the hot water supply system is arranged between a water inlet of the lower lip plate outer hot water interlayer and a water outlet of the upper lip plate outer hot water interlayer; the hot water supply system is arranged between a water inlet of the hot water interlayer in the upper lip plate and a water outlet of the hot water interlayer in the lower lip plate; according to the utility model, through the dual structure of the upper lip plate and the lower lip plate, the temperature of the outer surfaces of the upper lip plate and the lower lip plate can be close to the slurry temperature, so that the non-uniform thermal expansion caused by temperature change is avoided, the lip plates are prevented from being deformed, the stability of the opening degree of the lip plates is ensured, and the quantitative uniformity of finished products is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to paper manufacturing equipment technical field especially relates to an improved flow headbox spout lip plate temperature control device. BACKGROUND

[0002] In the papermaking forming process, the flow headbox plays a very important role in the quality of paper forming, the paper pulp is sprayed from the spout formed between the upper and lower lip plates of the flow headbox to form a paper web, therefore, the structural stability between the upper and lower lip plates of the flow headbox will affect the uniformity of the final formed paper web. In production, the temperature of the paper pulp can reach 50-60 DEG C, and only the inner surfaces of the upper and lower lip plates will be in contact with the hot paper pulp in the forming process, while the outer surfaces of the upper and lower lip plates are exposed to room temperature. Due to the temperature difference between the inner and outer surfaces of the upper and lower lip plates, local deformation of the upper and lower lip plates often occurs, which affects the uniform forming of the paper pulp and causes unevenness of the paper web.

[0003] Chinese utility model patent publication No. CN210561443U discloses a flow headbox spout lip plate temperature control device, which includes an upper lip plate and a lower lip plate, the upper lip plate is arranged at the upper end of the paper pulp outlet of the flow headbox, the lower lip plate is arranged at the lower end of the paper pulp outlet of the flow headbox, the space between the upper lip plate and the lower lip plate forms a spout for the paper pulp to form a paper web, and further includes an upper lip plate hot water interlayer and a lower lip plate hot water interlayer, the upper lip plate hot water interlayer is arranged on the upper surface of the upper lip plate, the lower lip plate hot water interlayer is arranged on the lower surface of the lower lip plate, the inner part of the upper lip plate hot water interlayer and the lower lip plate hot water interlayer each has a containing cavity for hot water circulation, the upper water outlet of the upper lip plate hot water interlayer is connected with the lower water inlet of the lower lip plate hot water interlayer, and a hot water supply system is arranged between the upper water inlet and the lower water outlet. The circulation supply of the upper lip plate hot water interlayer and the lower lip plate hot water interlayer combined with the hot water supply system can avoid the problem of local deformation of the upper and lower lip plates due to the temperature difference between the inner and outer surfaces of the upper and lower lip plates. However, the inner part of the upper lip plate hot water interlayer and the lower lip plate hot water interlayer in the device only has a single containing cavity, and the circulation effect of the hot water still has room for improvement, which causes the temperature change of the external environment to still have certain influence on the upper and lower lip plates, and the upper and lower lip plates still have certain local deformation problem. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing an improved flow headbox spout lip plate temperature control device to solve the above-mentioned problems.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] The application provides an improved flow box nozzle lip plate temperature control device, which comprises a flow box, an upper lip plate and a lower lip plate arranged at the upper and lower ends of the pulp outlet of the flow box, and a hot water supply system, wherein the space between the upper lip plate and the lower lip plate forms a nozzle for forming a paper web by pulp.

[0007] The upper surface of the upper lip plate is provided with an upper lip plate outer hot water interlayer and an upper lip plate inner hot water interlayer at intervals, and the lower surface of the lower lip plate is provided with a lower lip plate outer hot water interlayer and a lower lip plate inner hot water interlayer at intervals.

[0008] The upper lip plate outer hot water interlayer, the upper lip plate inner hot water interlayer, the lower lip plate outer hot water interlayer and the lower lip plate inner hot water interlayer each have a containing cavity for hot water flow.

[0009] The water outlet of the lower lip plate outer hot water interlayer is communicated to the water inlet of the upper lip plate outer hot water interlayer, and the hot water supply system is arranged between the water inlet of the lower lip plate outer hot water interlayer and the water outlet of the upper lip plate outer hot water interlayer.

[0010] The water outlet of the upper lip plate inner hot water interlayer is communicated to the water inlet of the lower lip plate inner hot water interlayer, and the hot water supply system is arranged between the water inlet of the upper lip plate inner hot water interlayer and the water outlet of the lower lip plate inner hot water interlayer.

[0011] In a possible implementation, the hot water supply system comprises a heating water storage tank and a vacuum pump.

[0012] The water outlet of the heating water storage tank is connected to the water inlet of the vacuum pump, and the water outlet of the vacuum pump is communicated to the water inlets of the lower lip plate outer hot water interlayer and the upper lip plate inner hot water interlayer through an upper water pipe.

[0013] The water inlets of the heating water storage tank are communicated to the water outlets of the upper lip plate outer hot water interlayer and the lower lip plate inner hot water interlayer through a backwater pipe.

[0014] In a possible implementation, the bottom of the upper water pipe is communicated with a first upper water branch and a second upper water branch.

[0015] The water outlet of the first upper water branch is communicated to the water inlet of the lower lip plate outer hot water interlayer, and the water outlet of the second upper water branch is communicated to the water inlet of the upper lip plate inner hot water interlayer.

[0016] In a possible implementation, the bottom of the backwater pipe is communicated with a first backwater branch and a second backwater branch.

[0017] The water inlet of the first backwater branch is communicated to the water outlet of the upper lip plate outer hot water interlayer, and the water inlet of the second backwater branch is communicated to the water outlet of the lower lip plate inner hot water interlayer.

[0018] In a possible implementation, the vacuum pump is a variable frequency pump.

[0019] In a possible implementation, the heating water storage tank is electrically connected with a temperature control system.

[0020] In summary, due to the adoption of the above technical solutions, the present application has the following advantages:

[0021] In the present application, the double structure of the outer hot water interlayer of the upper lip plate, the inner hot water interlayer of the upper lip plate, the outer hot water interlayer of the lower lip plate and the inner hot water interlayer of the lower lip plate can make the outer surface temperature of the upper lip plate and the lower lip plate close to the pulp temperature, thereby avoiding uneven thermal expansion caused by temperature change, preventing deformation of the lip plate and ensuring the stability of the opening degree of the lip plate and improving the uniformity of the finished product. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The present application is a structural schematic diagram.

[0023] Markings in the figure:

[0024] 1, headbox;

[0025] 2, upper lip plate; 201, outer hot water interlayer of upper lip plate; 202, inner hot water interlayer of upper lip plate;

[0026] 3, lower lip plate; 301, outer hot water interlayer of lower lip plate; 302, inner hot water interlayer of lower lip plate;

[0027] 4, heating water storage tank; 5, vacuum pump; 6, nozzle;

[0028] 7, water inlet pipe; 701, first water inlet branch; 702, second water inlet branch;

[0029] 8, water return pipe; 801, first water return branch; 802, second water return branch. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0031] First, use Figure 1 The overall structure of the improved headbox nozzle lip plate temperature control device will be described, Figure 1 The present application is a structural schematic diagram.

[0032] The improved headbox nozzle lip plate temperature control device comprises a headbox 1, an upper lip plate 2, a lower lip plate 3 and a hot water supply system, wherein:

[0033] The upper lip plate 2 is arranged at the upper end of the pulp outlet of the headbox 1, and the lower lip plate 3 is arranged at the lower end of the pulp outlet of the headbox 1; the space between the upper lip plate 2 and the lower lip plate 3 forms a nozzle 6 for the pulp to form a paper web.

[0034] The upper surface of the upper lip plate 2 is spaced apart to form an upper lip plate outer hot water layer 201 and an upper lip plate inner hot water layer 202 for accommodating hot water provided by a hot water supply system.

[0035] The lower surface of the lower lip plate 3 is spaced apart to form a lower lip plate outer hot water layer 301 and a lower lip plate inner hot water layer 302 for accommodating hot water provided by the hot water supply system.

[0036] The upper lip plate outer hot water layer 201, the upper lip plate inner hot water layer 202, the lower lip plate outer hot water layer 301, and the lower lip plate inner hot water layer 302 each have an accommodation cavity for hot water to flow through, i.e., the hot water provided by the hot water supply system can be accommodated through the accommodation cavity.

[0037] The water outlet of the lower lip plate outer hot water layer 301 is connected to the water inlet of the upper lip plate outer hot water layer 201, and the hot water supply system is arranged between the water inlet of the lower lip plate outer hot water layer 301 and the water outlet of the upper lip plate outer hot water layer 201. Through the hot water supply system, the hot water can circulate and flow through the lower lip plate outer hot water layer 301, the upper lip plate outer hot water layer 201, and the hot water supply system in a first level, which can heat the outer surfaces of the upper lip plate 2 and the lower lip plate 3. The water temperature of the hot water supply system is close to or equal to the pulp temperature, so that the deformation of the upper lip plate 2 and the lower lip plate 3 due to temperature changes can be avoided, the lip opening is balanced, and the uniformity of the finished product is improved.

[0038] The water outlet of the upper lip plate inner hot water layer 202 is connected to the water inlet of the lower lip plate inner hot water layer 302, and the hot water supply system is arranged between the water inlet of the upper lip plate inner hot water layer 202 and the water outlet of the lower lip plate inner hot water layer 302. Through the hot water supply system, the hot water can circulate and flow through the upper lip plate inner hot water layer 202, the lower lip plate inner hot water layer 302, and the hot water supply system in a second level. The first level of hot water circulation and the second level of hot water circulation are performed synchronously. The double outer cavity structure can further avoid the direct influence of the temperature change of the environment on the upper lip plate 2 and the lower lip plate 3, thereby further avoiding the deformation of the lip plate.

[0039] In some embodiments, as Figure 1As shown. The hot water supply system comprises a heating water storage tank 4 and a vacuum pump 5, the vacuum pump 5 is a variable frequency pump, and the heating water storage tank 4 is electrically connected with a temperature control system. The temperature control system is the same as that in the comparative file CN210561443U, which can be used to control the hot water temperature of the heating water storage tank 4, so that the water temperature is the same as the temperature of the pulp. Here, the detailed transition is not described.

[0040] Regarding the specific installation structure of the heating water storage tank 4 and the vacuum pump 5; the water outlet of the heating water storage tank 4 is connected to the water inlet of the vacuum pump 5, and the water outlet of the vacuum pump 5 is communicated to the water inlets of the upper-lip-plate outer hot water interlayer 301 and the upper-lip-plate inner hot water interlayer 202 through the water supply pipe 7;

[0041] The water inlet of the heating water storage tank 4 is communicated to the water outlets of the upper-lip-plate outer hot water interlayer 201 and the lower-lip-plate inner hot water interlayer 302 through the water return pipe 8.

[0042] In the present embodiment, through the cooperation of the heating water storage tank 4, the vacuum pump 5, the water supply pipe 7 and the water return pipe 8, the hot water in the heating water storage tank 4 can be supplied to the water inlet of the lower-lip-plate outer hot water interlayer 301 along the water supply pipe 7, and the hot water in the lower-lip-plate outer hot water interlayer 301 can be supplied to the upper-lip-plate outer hot water interlayer 201, and the hot water in the upper-lip-plate outer hot water interlayer 201 is returned to the heating water storage tank 4 through the water return pipe 8, forming a first-stage hot water circulation flow.

[0043] The hot water in the heating water storage tank 4 can be supplied to the water inlet of the upper-lip-plate inner hot water interlayer 202 along the water supply pipe 7, and the hot water in the upper-lip-plate inner hot water interlayer 202 can be supplied to the lower-lip-plate inner hot water interlayer 302, and the hot water in the lower-lip-plate inner hot water interlayer 302 is returned to the heating water storage tank 4 through the water return pipe 8, forming a second-stage hot water circulation flow.

[0044] In some embodiments, as shown. Figure 1 The bottom of the water supply pipe 7 is communicated with a first water supply branch 701 and a second water supply branch 702; the water outlet of the first water supply branch 701 is communicated to the water inlet of the lower-lip-plate outer hot water interlayer 301; the water outlet of the second water supply branch 702 is communicated to the water inlet of the upper-lip-plate inner hot water interlayer 202. By providing the first water supply branch 701 and the second water supply branch 702, the pipeline structure and cost can be saved.

[0045] The bottom of the water return pipe 8 is communicated with a first water return branch 801 and a second water return branch 802; the water inlet of the first water return branch 801 is communicated to the water outlet of the upper-lip-plate outer hot water interlayer 201; the water inlet of the second water return branch 802 is communicated to the water outlet of the lower-lip-plate inner hot water interlayer 302. By providing the first water return branch 801 and the second water return branch 802, the pipeline structure and cost can be saved.

[0046] In the description of the utility model, it is necessary to explain that the term "include", "contain" or any other variant is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes the elements inherent in such process, method, article or device. Without more limitations, the element defined by the sentence "including a" does not exclude the existence of other same elements in the process, method, article or device including the element.

[0047] In addition, in the description of the utility model, the orientation or position relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0048] On the other hand, it is necessary to explain that unless otherwise explicitly specified and limited, the terms "provided", "installed", "connected", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

Claims

1. An improved temperature control device for the lip plate of a headbox nozzle, comprising a headbox (1), an upper lip plate (2) and a lower lip plate (3) arranged at the upper and lower ends of the pulp outlet of the headbox (1), and a hot water supply system, the space between the upper lip plate (2) and the lower lip plate (3) forming a nozzle (6) for the formation of a paper web from pulp, characterized in that: the upper surface of the upper lip plate (2) is provided with an upper lip plate outer hot water interlayer (201) and an upper lip plate inner hot water interlayer (202) at intervals, and the lower surface of the lower lip plate (3) is provided with a lower lip plate outer hot water interlayer (301) and a lower lip plate inner hot water interlayer (302) at intervals; the upper lip plate outer hot water interlayer (201), the upper lip plate inner hot water interlayer (202), the lower lip plate outer hot water interlayer (301), and the lower lip plate inner hot water interlayer (302) each have a containing cavity for the flow of hot water; the water outlet of the lower lip plate outer hot water interlayer (301) is connected to the water inlet of the upper lip plate outer hot water interlayer (201), and the hot water supply system is arranged between the water inlet of the lower lip plate outer hot water interlayer (301) and the water outlet of the upper lip plate outer hot water interlayer (201); the water outlet of the upper lip plate inner hot water interlayer (202) is connected to the water inlet of the lower lip plate inner hot water interlayer (302), and the hot water supply system is arranged between the water inlet of the upper lip plate inner hot water interlayer (202) and the water outlet of the lower lip plate inner hot water interlayer (302). The hot water supply system comprises a heated water storage tank (4) and a vacuum pump (5); the water outlet of the heated water storage tank (4) is connected to the water inlet of the vacuum pump (5), the water outlet of the vacuum pump (5) is connected to the water inlets of the lower lip plate outer hot water interlayer (301) and the upper lip plate inner hot water interlayer (202) through an upper water pipe (7); the water inlet of the heated water storage tank (4) is connected to the water outlets of the upper lip plate outer hot water interlayer (201) and the lower lip plate inner hot water interlayer (302) through a return water pipe (8). The bottom of the upper water pipe (7) is connected to a first upper water branch (701) and a second upper water branch (702); the water outlet of the first upper water branch (701) is connected to the water inlet of the lower lip plate outer hot water interlayer (301), and the water outlet of the second upper water branch (702) is connected to the water inlet of the upper lip plate inner hot water interlayer (202). The bottom of the return water pipe (8) is connected to a first return water branch (801) and a second return water branch (802); the water inlet of the first return water branch (801) is connected to the water outlet of the upper lip plate outer hot water interlayer (201), and the water inlet of the second return water branch (802) is connected to the water outlet of the lower lip plate inner hot water interlayer (302). The vacuum pump (5) is a variable frequency pump.

2. The improved flow box jet lip plate temperature control device of claim 1, wherein, The heated water storage tank (4) is electrically connected to a temperature control system. ​ ​ 3. The improved flow box jet lip plate temperature control apparatus of claim 2, wherein, ​ ​ 4. The improved flow box jet lip plate temperature control device of claim 2 or 3, wherein, ​ ​ 5. The improved flow box jet lip plate temperature control apparatus of claim 2, wherein, ​ 6. The improved flow box jet lip plate temperature control apparatus of claim 1, wherein, ​

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