Pressure testing device for papermaking wood chips

Abstract

The application provides a wood chip pressure testing device for papermaking, which comprises a container, a pressing cover and a bottom supporting plate. The container comprises a peripheral side wall and a bottom wall, and an accommodating cavity is formed in the interior of the container for accommodating wood chips to be tested. An opening is arranged at one end of the peripheral side wall away from the bottom wall, the pressing cover is arranged on the opening, and the pressing cover can move along the inner wall of the peripheral side wall under the action of an external pressure providing device to compress the wood chips to be tested placed in the accommodating cavity. The bottom wall is provided with an operation hole, and the bottom supporting plate is arranged in the accommodating cavity and covers the operation hole. The wood chip pressure testing device for papermaking provided by the application embodiment greatly improves the in-depth evaluation test of the wood chip running performance, and has the characteristics of simple structure, convenient operation and accurate detection.

Description

Technical Field

[0001] This application relates to the technical field of papermaking auxiliary testing equipment, specifically to a pressure testing device for wood chips used in papermaking. Background Technology

[0002] Currently, the industry focuses on the compression ratio of wood chips entering the pulping process, which determines the operation of the wood chips, the throughput of each stage, and the production setting. However, unless the wood chips are directly fed into production equipment for evaluation, it is not possible to conduct effective evaluation in the laboratory beforehand, leaving a significant gap in the research on wood chips before their use. Utility Model Content

[0003] This application provides a pressure testing device for wood chips used in papermaking. The pressure testing device includes a container, a pressure cap, and a bottom plate. The container includes a peripheral wall and a bottom wall, forming an internal cavity for accommodating the wood chips to be tested. An opening is provided at one end of the peripheral wall away from the bottom wall. The pressure cap is placed over the opening and can move along the inner wall of the peripheral wall under the action of an external pressure supply device to compress the wood chips to be tested placed in the cavity. An operating hole is provided in the bottom wall, and the bottom plate is disposed in the cavity and covers the operating hole.

[0004] In some alternative embodiments, the gland includes an integrally formed cover body and a protrusion located in the middle of the cover body, the protrusion being used for contact and engagement with an external pressure supply device.

[0005] In some alternative embodiments, the protrusion has a mating hole in the middle.

[0006] In some optional embodiments, the base plate is provided with a positioning ring, which is engaged in the operating hole of the bottom wall to achieve positioning engagement with the bottom wall.

[0007] In some alternative embodiments, the base plate has an operating protrusion on the side opposite to the receiving cavity.

[0008] In some alternative embodiments, the operating protrusion is a bolt screwed onto the base plate.

[0009] In some alternative embodiments, the container further includes a handle fixed to the outer peripheral surface of the peripheral sidewall.

[0010] In some optional embodiments, the pressure testing device further includes a support plate with a mounting groove, the bottom wall of the container being disposed within the mounting groove.

[0011] In some alternative embodiments, the pressure testing device further includes a support and a pressure providing device fixed to the support. The pressure providing device has a pressure head that abuts against the pressure cap and pushes the pressure cap to move along the inner wall of the peripheral sidewall to compress the wood chip to be tested placed in the receiving cavity.

[0012] In some alternative embodiments, the pressure testing device further includes an auxiliary pressure block fixed to the pressure head of the pressure providing device, the auxiliary pressure block being used to engage with a protrusion on the pressure cap.

[0013] The pressure testing device for papermaking wood chips provided in this application embodiment converts the pressure of each stage of the actual production process, thus completely simulating the pressure conditions experienced by wood chips during operation in each stage of actual production, and thereby calculating the compression ratio. Currently, unless the material is directly fed into production equipment for evaluation, it is impossible to conduct effective evaluation in the laboratory beforehand, leaving a significant gap in exploring the physicochemical properties of wood chips before use. The pressure testing device in this application embodiment greatly improves the in-depth evaluation and testing of wood chip performance during the process, and features simple structure, convenient operation, and accurate detection. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of an embodiment of the pressure testing device for papermaking wood chips according to this application;

[0016] Figure 2 This is a schematic diagram of another embodiment of the pressure testing device for papermaking wood chips in this application;

[0017] Figure 3 This is a schematic diagram of another embodiment of the pressure testing device for papermaking wood chips according to this application;

[0018] Figure 4 This is a schematic diagram of another embodiment of the pressure testing device for papermaking wood chips in this application;

[0019] Figure 5 yes Figure 4 A partial structural schematic diagram of the pressure testing device in the embodiment;

[0020] Figure 6 This is a schematic diagram of another embodiment of the pressure testing device for papermaking wood chips in this application. Detailed Implementation

[0021] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the application. Similarly, the following embodiments are only some, not all, embodiments of the present application, and all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present application.

[0022] The terms "first," "second," and "third" used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. The terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.

[0023] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0024] Please refer to the following: Figure 1 , Figure 1 This is a schematic diagram of an embodiment of the pressure testing device for papermaking wood chips according to this application. The pressure testing device for papermaking wood chips in this embodiment includes a container 100, a pressure cap 200, and a base plate 300.

[0025] Specifically, in this embodiment, the container 100, the pressure cap 200, and the bottom support plate 300 can all be made of stainless steel or other metal materials. The container 100 includes a peripheral side wall 110 and a bottom wall 120, and forms an internal receiving cavity 1000 for receiving the wood chip 88 to be tested; wherein, the peripheral side wall 110 and the bottom wall 120 can be an integral structure or welded together.

[0026] An opening 101 is provided at one end of the peripheral sidewall 110 away from the bottom wall 120. A pressure cap 200 is placed over the opening 101 and can move along the inner wall of the peripheral sidewall 110 (downward in the direction of arrow X in the figure) under the action of an external pressure supply device (described in detail later) to compress the wood chip 88 to be tested placed in the receiving cavity 1000. An operating hole 121 is provided on the bottom wall 120, and a bottom support plate 300 is located in the receiving cavity 1000 and covers the operating hole 121. The bottom support plate 300 is a movable structure, and by providing an operating hole 121 on the bottom wall 120, it is convenient to pour out the compressed wood chip after the pressure test is completed.

[0027] Optionally, the pressure cap 200 in this embodiment includes an integral cap body 210 and a protrusion 220. The protrusion 220 is located in the middle of the cap body 210 and is used for abutting and engaging with an external pressure supply device. The protrusion 220 may also have a mating hole 221 in the middle for inserting the pressure head of the external pressure supply device.

[0028] Optionally, please refer to Figure 2 , Figure 2 This is a schematic diagram of another embodiment of the pressure testing device for papermaking wood chips in this application. The pressure testing device in this embodiment can also include a container 100, a pressure cap 200, and a bottom support plate 300. The container 100 includes a peripheral side wall 110 and a bottom wall 120, and forms an internal receiving cavity 1000 for receiving the wood chip 88 to be tested.

[0029] An opening 101 is provided at one end of the peripheral sidewall 110 away from the bottom wall 120. A pressure cap 200 is placed over the opening 101 and can move along the inner wall of the peripheral sidewall 110 (downward in the direction of arrow X in the figure) under the action of an external pressure supply device (described in detail later) to compress the wood chip 88 to be tested placed in the receiving cavity 1000. An operating hole 121 is provided on the bottom wall 120, and a bottom support plate 300 is located in the receiving cavity 1000 and covers the operating hole 121. The bottom support plate 300 is a movable structure, and by providing an operating hole 121 on the bottom wall 120, it is convenient to pour out the compressed wood chip after the pressure test is completed.

[0030] Optionally, the pressure cap 200 in this embodiment includes an integral cap body 210 and a protrusion 220. The protrusion 220 is located in the middle of the cap body 210 and is used for abutting and engaging with an external pressure supply device. The protrusion 220 may also have a mating hole 221 in the middle for inserting the pressure head of the external pressure supply device.

[0031] Unlike the previous embodiments, the container 100 in this embodiment also includes a handle 130 fixed to the outer peripheral surface of the peripheral wall 110, making it convenient for users to move the container 100. The pressure testing device also includes a support plate 400, on which a mounting groove 410 is provided, and the bottom wall 120 of the container 100 is disposed in the mounting groove 410.

[0032] Please see Figure 3 , Figure 3 This is a schematic diagram of another embodiment of the pressure testing device for papermaking wood chips according to this application. Unlike the previous embodiments, in this embodiment, the base plate 300 is provided with a positioning ring 310, which is engaged within the operating hole 121 of the bottom wall 120 to achieve positioning engagement with the bottom wall 120. The positioning ring 310 can be an integral structure with the base plate 300.

[0033] Optionally, in this embodiment, the base plate 300 is provided with an operating protrusion 320 on the side opposite to the receiving cavity 1000. Optionally, the operating protrusion 320 can be a bolt screwed onto the base plate 300. In some other embodiments, the operating protrusion 320 can also be a handle or a protrusion structure integral with the base plate 300.

[0034] Please refer to the following: Figure 4 and Figure 5 , Figure 4 This is a schematic diagram of another embodiment of the pressure testing device for papermaking wood chips according to this application. Figure 5 yes Figure 4 A partial structural diagram of the pressure testing device in this embodiment is shown. The pressure testing device in this embodiment also includes a support 500 and a pressure providing device 600. The pressure providing device 600 is fixed to the support 500. The pressure head 610 of the pressure providing device 600 can abut against the pressure cap 200 and push the pressure cap 200 to move along the inner wall of the peripheral sidewall of the container 100 to compress the wood chip 88 to be tested placed in the receiving cavity. The pressure providing device 600 can be a pneumatic cylinder.

[0035] The pressure supply device 600 is explained using a pneumatic cylinder as an example. The testing principle is as follows: The pressure supply device 600 can adjust the output pressure value. Pressure F = P (pressure / air pressure) * S (area)

[0036] Since the pressure supply device 600 and the pressure cap 200 are in contact, they are subjected to equal forces.

[0037] Therefore: F1 = F2, that is: P1S1 = P2S2;

[0038] P1: Cylinder pressure (back pressure)

[0039] S1: Cylinder area

[0040] P2: Pressure of the gland 200

[0041] S2: Cover area 200.

[0042] In one embodiment, it is known that: P1 = 3 bar;

[0043] S1 = 706.5cm 2 (300mm in diameter)

[0044] S2 = 2789.86cm 2 (600mm in diameter)

[0045] We obtain: P2 = 0.75 bar = 75 kPa

[0046] Based on the experimental loading values, the following was calculated proportionally:

[0047] 75 ÷ 377 ≈ 0.2 bar (kg / cm²) 2 ).

[0048] In addition, the compression ratio can also be measured.

[0049] Measure the height of the compression using a steel ruler; calculate the height after compression as: height of the hopper - depth of compression; calculate the compression ratio as: height after compression ÷ height of the hopper; obtain the compressed bulk density as: bulk bulk density ÷ compression ratio (calculation of bulk bulk density omitted).

[0050] The test data is shown in the table below.

[0051]

[0052] The experiment clearly shows that after multiple MSD cycles and twin-screw extrusions, the wood chips are finer and have a higher compressed bulk density, which has a significant impact on throughput and throughput time. This experiment can objectively simulate on-site conditions and is feasible.

[0053] The pressure testing device in this application, for different types of wood chips, provides a method for evaluating the compression ratio of wood chips. The key advantage of this self-made compression ratio evaluation device is its applicability to all types of wood chips, allowing for the study of their characteristics. This avoids production risks such as material blockage or operational disruptions caused by different types of wood chips entering the system. After evaluation, the set process can be adapted to different pressure settings for different wood chips, significantly reducing the risk of material blockage and equipment damage, resulting in immeasurable direct economic benefits. Currently, in the industry, effective evaluation in the laboratory is not possible unless materials are directly fed into production equipment. This device can be widely used for evaluating the compression ratio of various types of wood chips, including wood chips and non-wood plant fibers. It is easy to operate, has a wide range of applications, can adapt to long-term continuous evaluation, and has reliable performance.

[0054] Please see Figure 6 , Figure 6 This is a schematic diagram of another embodiment of the pressure testing device for papermaking wood chips in this application. Unlike the previous embodiment, the pressure testing device in this embodiment also includes an auxiliary pressure block 700. The auxiliary pressure block 700 is fixed to the pressure head 610 of the pressure providing device 600 and is used to cooperate with the protrusion 220 on the pressure cover 200.

[0055] The pressure testing device for papermaking wood chips provided in this application embodiment converts the pressure of each stage of the actual production process, thus completely simulating the pressure conditions experienced by wood chips during operation in each stage of actual production, and thereby calculating the compression ratio. Currently, unless the material is directly fed into production equipment for evaluation, it is impossible to conduct effective evaluation in the laboratory beforehand, leaving a significant gap in exploring the physicochemical properties of wood chips before use. The pressure testing device in this application embodiment greatly improves the in-depth evaluation and testing of wood chip performance during the process, and features simple structure, convenient operation, and accurate detection.

[0056] The above description is only a part of the embodiments of this application and does not limit the scope of protection of this application. Any equivalent device or equivalent process transformation made based on the content of this application specification and drawings, or direct or indirect application in other related technical fields, are similarly included in the patent protection scope of this application.

Claims

1. A pressure testing device for wood chips used in papermaking, characterized in that, The pressure testing device includes a container, a pressure cap, and a base plate; the container includes a peripheral side wall and a bottom wall, and forms an internal cavity for accommodating the wood chip to be tested; An opening is provided at one end of the peripheral sidewall away from the bottom wall. The pressure cap is placed over the opening and can move along the inner wall of the peripheral sidewall under the action of an external pressure supply device to compress the wood chip to be tested placed in the receiving cavity. An operating hole is provided in the bottom wall. The bottom support plate is located in the receiving cavity and covers the operating hole.

2. The pressure testing device according to claim 1, characterized in that, The pressure cap includes an integral cap body and a protrusion. The protrusion is located in the middle of the cap body and is used for contact and engagement with an external pressure supply device.

3. The pressure testing device according to claim 2, characterized in that, The protrusion has a mating hole in the middle.

4. The pressure testing device according to claim 1, characterized in that, The base plate is provided with a positioning ring, which is engaged in the operating hole of the bottom wall to achieve positioning and cooperation with the bottom wall.

5. The pressure testing device according to claim 4, characterized in that, The base plate has an operating protrusion on the side opposite to the receiving cavity.

6. The pressure testing device according to claim 5, characterized in that, The operating protrusion is a bolt screwed onto the base plate.

7. The pressure testing device according to claim 1, characterized in that, The container also includes a handle fixed to the outer peripheral surface of the peripheral wall.

8. The pressure testing device according to claim 1, characterized in that, The pressure testing device also includes a support plate with a mounting groove, and the bottom wall of the container is located within the mounting groove.

9. The pressure testing device according to claim 1, characterized in that, The pressure testing device also includes a support and a pressure supply device. The pressure supply device is fixed to the support, and the pressure head of the pressure supply device can abut against the pressure cap and push the pressure cap to move along the inner wall of the peripheral sidewall to compress the wood chip to be tested placed in the receiving cavity.

10. The pressure testing device according to claim 9, characterized in that, The pressure testing device also includes an auxiliary pressure block, which is fixed to the pressure head of the pressure supply device and is used to cooperate with the protrusion on the pressure cap.

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