High-safety paper pulp pressurized screen for papermaking

Abstract

The utility model relates to the technical field of paper pulp pressurized screens for papermaking, in particular to a high-safety paper pulp pressurized screen for papermaking, which comprises a paper pulp pressurized screen body, the paper pulp pressurized screen body is provided with a feed pipe, a slag discharge pipe and a drain pipe, and the drain pipe is in pipeline connection with a water outlet pipe through a magnetic filter; a second pressure gauge is arranged on the drainage pipe, and a first pressure gauge is arranged on the water outlet pipe; when the difference value between the pressure value of the second pressure gauge and the pressure value of the first pressure gauge exceeds a set threshold value, the control device sends out safety early warning information. The number of motor shaft bearing abrasion particles adsorbed by the magnetic filter is judged through pressure values of the first pressure gauge and the second pressure gauge, so that the motor shaft abrasion degree of the variable frequency motor is pre-judged in advance, and the safety risk is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of paper pulp pressure screen for papermaking, and particularly relates to a paper pulp pressure screen for papermaking with high safety. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] The paper pulp pressure screen is a key equipment for paper pulp screening in the papermaking industry. The paper pulp is transported into the paper pulp pressure screen under the action of a certain pressure, and the pulp and impurities in the paper pulp are separated through the screen holes on the screen drum.

[0004] However, the existing paper pulp pressure screen has the following safety problems in use: first, the screen holes of the screen drum are easy to be blocked. For example, a patent document with the application number 202420782896.2 and the utility model name of a paper pulp pressure screen for papermaking discloses a paper pulp pressure screen for papermaking. The screen drum inside is provided with a rotor to rotate the inside of the screen drum, so as to clean the impurities on the screen drum. However, the paper pulp enters the inside of the screen drum from the outside of the screen drum, and the outside of the screen drum is more likely to accumulate impurities. The patent document does not disclose the technical means for cleaning the outside of the screen drum. Second, the bearing of the motor is easy to wear. When the motor is arranged outside the pressure screen, it is more likely to wear. Therefore, the prior art provides a technical solution that the motor is placed inside the screen drum to directly drive the rotor. However, in this case, the motor shaft is difficult to be directly found if it is worn.

[0005] When the screen holes are blocked, the motor current will increase, increasing the risk of fire. When the motor bearing is worn without being found, the motor is easy to stall, causing a safety risk.

[0006] Therefore, it is necessary to provide a paper pulp pressure screen for papermaking with high safety to solve the above technical problems. SUMMARY

[0007] Therefore, in view of the above technical problems, the present application provides a paper pulp pressure screen for papermaking with high safety.

[0008] The technical scheme adopted by the present application to solve the problems in the prior art is as follows:

[0009] The present application provides a paper pulp pressure screen for papermaking with high safety, which comprises a paper pulp pressure screen body, a feeding pipe, a slag discharge pipe and a water discharge pipe are arranged on the paper pulp pressure screen body, the water discharge pipe is connected with a water outlet pipe through a magnetic filter, a second pressure gauge is arranged on the water discharge pipe, and a first pressure gauge is arranged on the water outlet pipe.

[0010] The first pressure gauge and the second pressure gauge are electrically connected with the control device.

[0011] Preferably,

[0012] When the difference between the pressure value of the second pressure gauge and the pressure value of the first pressure gauge exceeds a set threshold value, the control device issues a safety warning information.

[0013] Preferably,

[0014] The pulp pressure screen body comprises a mounting plate, a screen drum is fixedly arranged on the mounting plate, and a through hole matched with the bottom of the screen drum is arranged in the middle of the mounting plate;

[0015] A variable frequency motor is arranged in the screen drum, the bottom of the variable frequency motor is fixedly arranged on the bottom plate, and the bottom plate is arranged below the mounting plate and detachably connected with the mounting plate;

[0016] The motor shaft of the variable frequency motor is fixedly connected with the connecting piece after rotating through the top of the screen drum, and the rotor is symmetrically fixedly arranged at both ends of the connecting piece, and the rotor is slidably connected with the outer surface of the screen drum;

[0017] A screen body is fixedly arranged on the mounting plate, and the screen body is arranged outside the screen drum; a screen cover is detachably connected above the screen body;

[0018] The screen body is provided with a feeding pipe and a residue discharging pipe;

[0019] A screen cavity is formed between the variable frequency motor and the screen drum;

[0020] A drain pipe is arranged below the bottom plate, and the drain pipe is connected in communication with the screen cavity through the bottom plate.

[0021] Preferably,

[0022] The bottom of the rotor is fixedly connected with a slip ring, and the slip ring is slidably sleeved outside the screen drum.

[0023] Preferably,

[0024] A plurality of supporting legs for supporting the pressure screen are fixedly arranged below the bottom plate.

[0025] Preferably,

[0026] The control device is fixedly arranged below the bottom plate, the variable frequency motor is electrically connected with the control device, and the control device is electrically connected with an external power supply.

[0027] Preferably,

[0028] A plurality of screen holes are arranged on the screen drum.

[0029] Preferably,

[0030] Lifting holes are symmetrically arranged at both sides of the top of the screen cover.

[0031] Preferably,

[0032] The magnetic filter is used for adsorbing iron impurities in the paper pulp.

[0033] Preferably,

[0034] The motor shaft material of the variable frequency motor is bearing steel.

[0035] Compared with the prior art, the application has the following beneficial effects:

[0036] 1. The rotor 13 is arranged outside the screen drum, and continuously cleans the outside of the screen drum 12 under the rotation of the variable frequency motor 18, preventing the screen holes 17 from being blocked.

[0037] 2. The pressure values of the first pressure gauge 8 and the second pressure gauge 9 are used to determine how many motor shaft bearing wear particles are adsorbed by the magnetic filter 7, so as to predict the motor shaft wear degree of the variable frequency motor 18 in advance and reduce the safety risk.

[0038] 3. The bottom of the rotor 13 is connected with the slip ring 16, and the slip ring 16 is connected with the screen drum in a sliding manner to provide a guiding effect for the rotor 13 and prevent the rotor 13 from being bent. BRIEF DESCRIPTION OF DRAWINGS

[0039] The drawings accompanying the specification of the present application serve to provide a further understanding of the present application, and the illustrative embodiments of the present application and their descriptions serve to explain the present application, and do not constitute an improper limitation on the present application.

[0040] Figure 1 A safe paper pulp pressure screen structure for papermaking,

[0041] Figure 2 A safe paper pulp pressure screen structure for papermaking, Figure 1 A safe paper pulp pressure screen structure for papermaking,

[0042] Figure 3 A safe paper pulp pressure screen structure for papermaking, Figure 2 A safe paper pulp pressure screen structure for papermaking,

[0043] In the drawings:

[0044] 1. screen body, 2. screen cover, 3. slag discharge pipe, 4. water discharge pipe, 5. foot, 6. control device, 7. magnetic filter, 8. first pressure gauge, 9. second pressure gauge, 10. water outlet pipe, 11. mounting plate, 12. screen drum, 13. rotor, 14. connecting piece, 15. motor shaft, 16. slip ring, 17. screen hole, 18. variable frequency motor, 19. screen cavity, 20. lifting hole, 21. feed pipe, 22. bottom plate. DETAILED DESCRIPTION

[0045] The present application will be further described below in conjunction with the drawings and embodiments.

[0046] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used in this description, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0047] In the present disclosure, the terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only a relationship word determined for the convenience of describing the structural relationship of the components or elements of the present disclosure, and cannot be understood as a limitation of the present disclosure.

[0048] Reference Figure 1 , a paper pulp pressure screen for papermaking with high safety, a paper pulp pressure screen for papermaking with high safety according to the present application includes a paper pulp pressure screen body, the paper pulp pressure screen body is provided with a feeding pipe 21, a residue discharge pipe 3 and a water discharge pipe 4, the water discharge pipe 4 is connected with a water outlet pipe 10 through a magnetic filter 7; the water discharge pipe 4 is provided with a second pressure gauge 9, and the water outlet pipe 10 is provided with a first pressure gauge 8; the first pressure gauge 8 and the second pressure gauge 9 are electrically connected with a control device 6. When the difference between the pressure value of the second pressure gauge 9 and the pressure value of the first pressure gauge 8 exceeds the set threshold value, the control device 6 sends a safety warning information.

[0049] The magnetic filter 7 is composed of several strong magnetic force rods made of permanent magnetic material and designed by special magnetic circuit. During the conveying of liquid slurry, the 0.5-60 micron iron-containing small particles in the liquid slurry are adsorbed on the magnetic rods, so as to completely remove the iron impurities in the liquid slurry, purify the material, ensure the product quality, safety and efficient operation of the downstream equipment.

[0050] In the present application, the motor shaft of the variable frequency motor 18 drives the rotor 13 to rotate, which on the one hand stirs the paper pulp to make it easier to realize solid-liquid separation, and on the other hand removes the particles attached to the outside of the screen drum 12 during the rotation of the rotor 13 to prevent the screen holes 17 of the screen drum 12 from being blocked. Undoubtedly, the motor shaft bears a large stress and is easy to wear. When the motor shaft is worn, the particles generated by the wear will flow into the inside of the screen drum 12 through the screen holes 17 and finally enter the water discharge pipe 4.

[0051] Since the magnetic filter 7 is arranged on the drain pipe 4 in the application, the particles generated by the motor shaft bearing abrasion will be adsorbed by the magnetic filter 7. When the magnetic filter 7 adsorbs more and more particles, a pressure on the pulp inside the drain pipe 4 will be generated, thereby generating a pressure difference between the two ends of the magnetic filter 7, so that a large difference value between the pressure value of the first pressure gauge 8 and the pressure value of the second pressure gauge 9 is generated. By judging the difference value, it can be judged how many particles are adsorbed by the magnetic filter 7, and then the abrasion degree of the motor shaft of the variable frequency motor 18 can be judged.

[0052] The magnetic filter 7 in the application is used to adsorb the ferrous impurities in the pulp. The material of the motor shaft of the variable frequency motor 18 is bearing steel.

[0053] Referring to Figure 1 , Figure 2 and Figure 3 , the pulp pressure screen body in the application comprises a mounting plate 11, a screen drum 12 is fixedly arranged on the mounting plate 11, and a through hole matched with the bottom of the screen drum 12 is arranged in the middle of the mounting plate 11; a plurality of screen holes 17 are arranged on the screen drum 12.

[0054] A variable frequency motor 18 is arranged in the screen drum 12, and the bottom of the variable frequency motor 18 is fixedly arranged on a bottom plate 22, which is arranged below the mounting plate 11 and detachably connected with the mounting plate 11.

[0055] The motor shaft of the variable frequency motor 18 is fixedly connected with a connecting piece 14 after rotating through the top of the screen drum 12; a rotor 13 is symmetrically fixedly arranged at both ends of the connecting piece 14, and the rotor 13 is slidingly connected with the outer surface of the screen drum 12.

[0056] A screen body 1 is fixedly arranged on the mounting plate 11, and the screen body 1 is arranged outside the screen drum 12; a screen cover 2 is detachably connected above the screen body 1.

[0057] The screen body 1 is provided with a feeding pipe 21 and a residue discharge pipe 3.

[0058] A screen cavity 19 is formed between the variable frequency motor 18 and the screen drum 12.

[0059] A drain pipe 4 is arranged below the bottom plate 22, and the drain pipe 4 is connected in communication with the screen cavity 19 through the bottom plate 22.

[0060] The bottom of the rotor 13 is fixedly connected with a slip ring 16, and the slip ring 16 is slidingly sleeved outside the screen drum 12.

[0061] A plurality of supporting legs 5 for supporting the pressure screen are fixedly arranged below the bottom plate 22.

[0062] The control device 6 is fixed below the bottom plate 22, the variable frequency motor 18 is electrically connected with the control device 6, and the control device 6 is electrically connected with an external power supply.

[0063] The screen cover 2 is symmetrically provided with lifting holes 20 on both sides of the top, and the lifting holes 30 are used for installing a lifting nose to realize the dismounting and mounting of the screen cover 2.

[0064] The paper pulp pressure screen has high safety, the rotary wing 13 is arranged outside the screen drum 12, the rotary wing 13 continuously cleans the outside of the screen drum 12 under the rotating action of the variable frequency motor 18, and the screen hole 17 is prevented from being blocked. The number of motor shaft bearing wear particles adsorbed by the magnetic filter 7 is judged according to the pressure values of the first pressure gauge 8 and the second pressure gauge 9, so that the motor shaft wear degree of the variable frequency motor 18 is predicted in advance, and the safety risk is reduced. The rotary wing 13 is connected with the sliding ring 16, the sliding ring 16 is slidingly connected with the screen drum, the sliding ring 16 provides a guiding action for the rotary wing 13, and the rotary wing 13 is prevented from being bent.

[0065] The above is only the preferred embodiment of the application and is not used to limit the application, and the application can have various changes and variations for those skilled in the art. Any modification, equivalent replacement, improvement and the like made in the spirit and principle of the application should be included in the protection scope of the application.

[0066] Although the specific embodiments of the application are described above with reference to the drawings, the application is not limited to the above, and those skilled in the art should understand that various modifications or changes made on the basis of the technical solutions of the application without creative labor are still within the protection scope of the application.

Claims

1. A papermaking pulp pressure screen with high safety, comprising a pulp pressure screen body, wherein an inlet pipe (21), a residue discharge pipe (3) and a water discharge pipe (4) are arranged on the pulp pressure screen body, characterized in that: the water discharge pipe (4) is connected with a water outlet pipe (10) through a magnetic filter (7); the water discharge pipe (4) is provided with a second pressure gauge (9), and the water outlet pipe (10) is provided with a first pressure gauge (8); the first pressure gauge (8) and the second pressure gauge (9) are electrically connected with a control device (6).

2. The papermaking pulp pressure screen with high safety according to claim 1, characterized in that: when the difference between the pressure value of the second pressure gauge (9) and the pressure value of the first pressure gauge (8) exceeds a set threshold value, the control device (6) sends a safety warning information.

3. The papermaking pulp pressure screen with high safety according to claim 1 or 2, characterized in that: the pulp pressure screen body comprises a mounting plate (11), wherein a screen drum (12) is fixedly arranged on the mounting plate (11), and a through hole matched with the bottom of the screen drum (12) is arranged in the middle of the mounting plate (11); a variable frequency motor (18) is arranged in the screen drum (12), and the bottom of the variable frequency motor (18) is fixedly arranged on a bottom plate (22), wherein the bottom plate (22) is arranged below the mounting plate (11) and detachably connected with the mounting plate (11); the motor shaft of the variable frequency motor (18) is rotatably arranged through the top of the screen drum (12) and fixedly connected with a connecting piece (14), wherein symmetrical rotary wings (13) are fixedly arranged at the two ends of the connecting piece (14), and the rotary wings (13) are slidably connected with the outer surface of the screen drum (12); a screen body (1) is fixedly arranged on the mounting plate (11), and the screen body (1) is arranged outside the screen drum (12); a screen cover (2) is detachably connected above the screen body (1); the inlet pipe (21) and the residue discharge pipe (3) are arranged on the screen body (1); a screen cavity (19) is formed between the variable frequency motor (18) and the screen drum (12); and a water discharge pipe (4) is arranged below the bottom plate (22), and the water discharge pipe (4) is connected in communication with the screen cavity (19) through the bottom plate (22).

4. The papermaking pulp pressure screen with high safety according to claim 3, characterized in that: the bottom of the rotary wing (13) is fixedly connected with a sliding ring (16), and the sliding ring (16) is slidably sleeved outside the screen drum (12).

5. The papermaking pulp pressure screen with high safety according to claim 3, characterized in that: a plurality of supporting legs (5) are fixedly arranged below the bottom plate (22) for supporting the pressure screen.

6. The papermaking pulp pressure screen with high safety according to claim 3, characterized in that: the control device (6) is fixedly arranged below the bottom plate (22); the variable frequency motor (18) is electrically connected with the control device (6); and the control device (6) is electrically connected with an external power supply.

7. The papermaking pulp pressure screen with high safety according to claim 3, characterized in that: a plurality of screen holes (17) are arranged on the screen drum (12). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 8. The paper pulp pressure screen with high safety according to claim 3, characterized in that: The top of the screen cover (2) is provided with lifting holes (20) symmetrically on both sides.

9. The paper pulp pressure screen with high safety according to claim 1, characterized in that: The magnetic filter (7) is used to adsorb the iron impurities in the paper pulp.

10. The paper pulp pressure screen with high safety according to claim 3, characterized in that: The motor shaft of the variable frequency motor (18) is made of bearing steel.

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