Screen shaft sealing device of roller screen

Abstract

The invention provides a screen shaft sealing device of a roller screen, and belongs to the technical field of sealing. Comprising a shell, a plurality of sealing bins are formed in an inner hole of the shell, the sealing bins are filled with magnetic fluid, and the inner hole of the shell is used for installing a main shaft. The multiple sealing bins comprise the inner sealing bin, the outer sealing bin and the middle sealing bin. The shell comprises a first half shell body and a second half shell body, and the first half shell body and the second half shell body are connected through a first detachable connecting structure. A second detachable connecting structure is installed on the shell and used for being installed on a main equipment machine body needing to be sealed. When the sealing device runs, magnetic particles in the magnetic fluid are tightly adsorbed on the main shaft, and grease is used for lubrication, so that the sealing device is durable. The device can be used for screening and conveying equipment in various industries such as electric power, chemical engineering and mines. The sealing device is small in resistance, good in sealing effect and durable.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing, and in particular to a roller screen shaft sealing device. Background Art

[0002] A roller screen primarily consists of a screen box, screen shafts, a transmission device, and a frame. The screen box, typically rectangular or circular, holds the material and performs screening. The screen shafts are the core component of the roller screen, mounted with screen plates or bars. Multiple screen shafts are arranged parallel to each other within the screen box. The transmission device drives the screen shafts and typically consists of a motor, reducer, and coupling. The frame supports the entire system, ensuring its stability.

[0003] In the power, chemical, mining and other industries, roller screens and other screening equipment are widely used for screening materials. The screen shaft is mostly sealed with rubber rings, rubber pads, packing or planed oil seals. Due to the harsh operating environment of the equipment and the poor processing accuracy of the screen shaft, the above measures have large resistance, short service life, frequent replacement and maintenance, and the effect is difficult to meet the requirements.

[0004] Therefore, a sealing device with a long service life and good sealing effect is needed. Summary of the Invention

[0005] The present invention provides a roller screen shaft sealing device to solve the technical problems raised by the above background technology.

[0006] In order to solve the above technical problems, the present invention discloses a roller screen shaft sealing device, comprising:

[0007] The shell has an inner hole formed with a plurality of sealing chambers filled with magnetic fluid, and the inner hole of the shell is used for installing the main shaft.

[0008] Preferably, the multiple sealed chambers include: a sealed inner chamber, a sealed outer chamber, and a sealed middle chamber.

[0009] Preferably, the shell includes a first half shell and a second half shell, and the first half shell and the second half shell are connected via a first detachable connection structure.

[0010] Preferably, a second detachable connection structure is installed on the shell, and the second detachable connection structure is used to be installed on a main device body that needs to be sealed.

[0011] Preferably, the shell is made of wear-resistant material, which includes but is not limited to polyurethane elastic wear-resistant material or polytetrafluoroethylene, and the inner hole diameter of the shell is less than or equal to the outer diameter of the main shaft.

[0012] Preferably, the first detachable connection structure includes: a first magnetic attraction, the first magnetic attraction is installed on the docking surface of the first half shell and the second half shell, the second magnetic attraction is installed on the docking surface of the second half shell and the first half shell, and the first magnetic attraction and the second magnetic attraction are adsorbed and matched.

[0013] Preferably, the second detachable connection structure is a third magnetic attraction.

[0014] Preferably, the third magnet is mounted on the housing via a second screw.

[0015] Preferably, the system further comprises: a monitoring and early warning device, the monitoring and early warning device comprising:

[0016] Acquisition unit:

[0017] Used to obtain the working parameters of the spindle, which include: the working speed of the spindle, the working temperature of the spindle and the vibration parameters of the spindle;

[0018] First calculation unit:

[0019] for determining a first correction parameter based on the operating temperature of the spindle;

[0020] Second computing unit:

[0021] for determining a second correction parameter based on the vibration parameter of the main shaft;

[0022] The third computing unit:

[0023] Used to calculate the actual sealing reliability coefficient based on the first correction parameter and the second correction parameter;

[0024] Early Warning Unit:

[0025] Used to issue an early warning when the actual sealing reliability coefficient is less than the preset value.

[0026] Preferably, the first calculation unit calculates based on the following formula:

[0027]

[0028] K1 is the first correction parameter, σ1 is the viscosity of the magnetic fluid at the operating temperature of the spindle; σ2 is the standard viscosity of the magnetic fluid; h is the inner width of the sealed inner chamber along the radial direction of the spindle; d is the diameter of the spindle; ln is the natural logarithm, and e is a natural constant;

[0029] The second calculation unit is calculated based on the following formula:

[0030]

[0031] R is the amplitude of the main axis vibration parameter; δ is the vibration frequency of the main axis vibration parameter; μ is the vacuum magnetic permeability, M is the saturation magnetization intensity of the magnetic fluid, a is the radius of the magnetic particles of the magnetic fluid; F0 is the unit force; t is the unit time;

[0032] The third calculation unit is calculated based on the following formula:

[0033]

[0034] W is the actual sealing reliability coefficient; B is the target inner diameter of the sealed inner chamber, ρ is the density of the magnetic fluid; n is the operating speed of the spindle; F is the target sealing force between the magnetic fluid and the spindle; L is the internal length of the sealed inner chamber along the length direction of the spindle, H is the magnetic field strength at the sealed inner chamber; F is the standard sealing force of the magnetic fluid on the spindle.

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

[0036] The housing is planed in half, facilitating installation and replacement. First and second magnetic elements are installed on the planed surfaces, allowing them to automatically snap together after installation on the spindle (thus automatically closing the first and second shell halves). A third magnetic element is installed on the main mounting surface for attachment to the main equipment requiring sealing. The magnetic fluid is a mixture of lubricating grease and magnetic particles. During operation, the housings are separated, and the magnetic fluid is placed in a sealed chamber. The two halves are then placed on the spindle. The first and second shell halves automatically snap together, and the housings are pushed to securely attach to the main equipment requiring sealing. During operation, the magnetic particles in the magnetic fluid adhere tightly to the spindle, while the grease provides lubrication, ensuring a durable seal. This device can be used in screening and conveying equipment in various industries, including the power, chemical, and mining sectors.

[0037] The present invention has low resistance, good sealing effect and is durable. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 This is a front view structural diagram of the roller screen shaft sealing device of this application;

[0040] Figure 2 This is a side structural diagram of the roller screen shaft sealing device of this application.

[0041] In the figure: 1. Shell; 1.1. Sealed inner chamber; 1.2. Sealed outer chamber; 1.3. Sealed middle chamber; 1.4. Shell inner hole; 1.5. First half shell; 1.6. Second half shell; 2. Main shaft; 3. First magnet; 3.1. First screw; 4. Third magnet; 4.1. Second screw; 5. Magnetic fluid; 6. Center dividing line; 7. Second magnet. DETAILED DESCRIPTION

[0042] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0043] Example 1:

[0044] like Figure 1 As shown, an embodiment of the present invention provides a roller screen shaft sealing device, such as Figure 1-Figure 2 Shown, including:

[0045] The housing 1 has a housing inner hole 1.4 formed with a plurality of sealed chambers filled with magnetic fluid 5 . The housing inner hole 1.4 is used for mounting the main shaft 2 .

[0046] Preferably, the multiple sealed chambers include: a sealed inner chamber 1.1, a sealed outer chamber 1.2, and a sealed middle chamber 1.3.

[0047] Preferably, the housing 1.4 comprises a first half housing 1.5 and a second half housing 1.6 (eg Figure 1 、 Figure 2 As shown, the shell 1 is sliced into two halves (a first half shell 1.5 and a second half shell 1.6) from the middle dividing line 6, and the first half shell 1.5 and the second half shell 1.6 are connected by a first detachable connection structure.

[0048] Preferably, a second detachable connection structure is installed on the housing 1, and the second detachable connection structure is used to be installed on a main device body that needs to be sealed.

[0049] Preferably, the housing 1 is made of wear-resistant material, which includes but is not limited to polyurethane elastic wear-resistant material or polytetrafluoroethylene. The diameter of the housing inner hole 1.4 is less than or equal to the outer diameter of the main shaft 2.

[0050] Preferably, the first detachable connection structure includes: a first magnetic attraction 3, the first magnetic attraction 3 being mounted on the interface between the first half shell 1.5 and the second half shell 1.6, and a second magnetic attraction 7 being mounted on the interface (cross-section) between the second half shell 1.6 and the first half shell 1.5, the first magnetic attraction 3 and the second magnetic attraction 7 being engaged in an adsorption manner. The first magnetic attraction 3 (or the second magnetic attraction 7) is fixed to the first half shell 1.5 (or the second half shell 1.6) by a first screw 3.1, and may also be fixed by other means such as bonding;

[0051] Preferably, the second detachable connection structure is a third magnet 4; the third magnet 4 is fixed to the housing 1 by a second screw 4.1, and may also be fixed by other means such as bonding.

[0052] The present invention provides a screen shaft sealing device with a simple structure, reliable operation and good automatic sealing effect, which can be used for screening and conveying equipment in various industries such as power, chemical industry and mining.

[0053] According to existing technology, a roller screen primarily consists of a screen box, screen shaft, transmission device, and frame. The screen box, typically rectangular or circular, is the primary component that holds and screens the material. The screen shaft, the core component of the roller screen, is mounted with screen plates or bars. Multiple screen shafts are arranged parallel to each other within the screen box. The transmission device drives the screen shaft and typically consists of a motor, reducer, and coupling. The frame supports the entire system, ensuring its stability.

[0054] In the present invention, the second detachable connection structure is used to be installed on the main equipment body that needs to be sealed, that is, installed on the wall surface (such as the inner wall) of the screen box.

[0055] The beneficial effects of the above technical solution are:

[0056] The shell 1 is sliced in half from the center for easy installation and replacement. The sliced surface is installed with a first magnetic attraction 3 and a second magnetic attraction 7, so that they automatically close together after installation on the main shaft 2 (thus automatically closing the first half shell 1.5 and the second half shell 1.6). A third magnetic attraction 4 is installed on the main mounting surface for adsorption installation on the main equipment that needs to be sealed. The magnetic fluid 5 is a mixture of lubricating grease and magnetic particles. During use, the shell 1 is separated, and the magnetic fluid 5 is placed in the sealing chamber and placed on the main shaft 2. The first half shell 1.5 and the second half shell 1.6 automatically close together, and the shell 1 is pushed to tightly adsorb it on the main equipment that needs to be sealed. During operation, the magnetic particles in the magnetic fluid 5 are tightly adsorbed on the main shaft 2, and the grease lubricates it, making the sealing device durable. It can be used for screening, conveying and other equipment in various industries such as electricity, chemical industry, and mining.

[0057] The present invention has low resistance, good sealing effect and is durable.

[0058] Example 2, based on Example 1, further includes: a monitoring and early warning device, the monitoring and early warning device includes:

[0059] Acquisition unit:

[0060] Used to obtain the working parameters of the spindle 2, which include: the working speed of the spindle 2, the working temperature of the spindle 2, and the vibration parameters of the spindle 2;

[0061] First calculation unit:

[0062] for determining a first correction parameter based on the operating temperature of the spindle 2;

[0063] Second computing unit:

[0064] for determining a second correction parameter based on the vibration parameter of the main shaft 2;

[0065] The third computing unit:

[0066] Used to calculate the actual sealing reliability coefficient based on the first correction parameter and the second correction parameter;

[0067] Early warning unit: used to issue an early warning when the actual sealing reliability coefficient is less than the preset value.

[0068] The first calculation unit is based on the following formula:

[0069]

[0070] K1 is the first correction parameter, σ1 is the viscosity of the magnetic fluid at the operating temperature of the spindle 2; σ2 is the standard viscosity of the magnetic fluid (viscosity at 25°C); h is the inner width of the sealed inner chamber 1.1 along the radial direction of the spindle 2; d is the diameter of the spindle 2; ln is the natural logarithm, and e is a natural constant;

[0071] The second calculation unit is calculated based on the following formula:

[0072]

[0073] R is the amplitude of the vibration parameters of the main axis 2; δ is the vibration frequency of the vibration parameters of the main axis 2; μ is the vacuum magnetic permeability, M is the saturation magnetization intensity of the magnetic fluid, a is the radius of the magnetic particles of the magnetic fluid; F0 is the unit force; t is the unit time;

[0074] The third calculation unit is calculated based on the following formula:

[0075]

[0076] W is the actual sealing reliability coefficient; B is the target inner diameter of the sealed inner chamber 1.1, ρ is the density of the magnetic fluid; n is the operating speed of the main shaft 2; F is the target sealing force between the magnetic fluid and the main shaft 2; L is the internal length of the sealed inner chamber 1.1 along the length direction of the main shaft 2, H is the magnetic field strength at the sealed inner chamber 1.1; F is the standard sealing force of the magnetic fluid on the main shaft 2.

[0077] The beneficial effects of the above technical solution are:

[0078] The acquisition unit is used to acquire the working parameters of the spindle 2 in real time or periodically when the spindle 2 is working. The working parameters of the spindle 2 include: the working speed of the spindle 2, the working temperature of the spindle 2 and the vibration parameters of the spindle 2; and based on the acquired working parameters of the spindle 2, a first correction parameter and a second correction parameter that match them are obtained, and then the actual sealing reliability coefficient is calculated based on the first correction parameter and the second correction parameter; the early warning unit: is used to issue an early warning when the actual sealing reliability coefficient is less than a preset value, so as to promptly remind maintenance or replacement of components when the sealing effect of the current sealing device is abnormal, thereby ensuring the sealing effect of the present invention.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A roller screen shaft sealing device, characterized in that: include: A housing (1) is provided with a plurality of sealed chambers in an inner hole (1.4) of the housing (1), wherein the sealed chambers are filled with magnetic fluid (5), and the inner hole (1.4) of the housing is used for installing a main shaft (2).

2. A roller screen shaft sealing device according to claim 1, characterized in that: The multiple sealed chambers include: a sealed inner chamber (1.1), a sealed outer chamber (1.2), and a sealed middle chamber (1.3).

3. The roller screen shaft sealing device according to claim 1, characterized in that: The shell (1.4) comprises a first half shell (1.5) and a second half shell (1.6), wherein the first half shell (1.5) and the second half shell (1.6) are connected via a first detachable connection structure.

4. The roller screen shaft sealing device according to claim 1, characterized in that: A second detachable connection structure is installed on the housing (1), and the second detachable connection structure is used for being installed on a main device body that needs to be sealed.

5. The roller screen shaft sealing device according to claim 1, characterized in that: The shell (1) is made of wear-resistant material, which includes but is not limited to polyurethane elastic wear-resistant material or polytetrafluoroethylene. The diameter of the shell inner hole (1.4) is less than or equal to the outer diameter of the main shaft (2).

6. The roller screen shaft sealing device according to claim 3, characterized in that: The first detachable connection structure comprises: a first magnetic attraction (3), the first magnetic attraction (3) being mounted on the docking surface of the first half shell (1.5) and the second half shell (1.6), the second magnetic attraction (7) being mounted on the docking surface of the second half shell (1.6) and the first half shell (1.5), and the first magnetic attraction (3) and the second magnetic attraction (7) being adsorbed and matched.

7. The roller screen shaft sealing device according to claim 4, characterized in that: The second detachable connection structure is a third magnetic attraction (4).

8. The roller screen shaft sealing device according to claim 7, characterized in that: The third magnet (4) is mounted on the housing (1.4) via a second screw (4.1).

9. The roller screen shaft sealing device according to claim 1, characterized in that: Also includes: Monitoring and early warning device, which includes: Acquisition unit: Used to obtain the working parameters of the main shaft (2), the working parameters of the main shaft (2) include: the working speed of the main shaft (2), the working temperature of the main shaft (2) and the vibration parameters of the main shaft (2); First calculation unit: for determining a first correction parameter based on the operating temperature of the spindle (2); Second computing unit: for determining a second correction parameter based on a vibration parameter of the main shaft (2); The third computing unit: Used to calculate the actual sealing reliability coefficient based on the first correction parameter and the second correction parameter; Early warning unit: used to issue an early warning when the actual sealing reliability coefficient is less than the preset value.

10. The roller screen shaft sealing device according to claim 9, characterized in that: The first calculation unit is based on the following formula: K1 is the first correction parameter, σ1 is the viscosity of the magnetic fluid at the operating temperature of the main shaft (2); σ2 is the standard viscosity of the magnetic fluid; h is the inner width of the sealed inner chamber (1.1) along the radial direction of the main shaft (2); d is the diameter of the main shaft (2); ln is the natural logarithm, and e is a natural constant; The second calculation unit is calculated based on the following formula: R is the amplitude of the vibration parameters of the main axis (2); δ is the vibration frequency of the vibration parameters of the main axis (2); μ is the vacuum magnetic permeability, M is the saturation magnetization intensity of the magnetic fluid, a is the radius of the magnetic particles of the magnetic fluid; F0 is the unit force; t is the unit time; The third calculation unit is calculated based on the following formula: W is the actual sealing reliability coefficient; B is the target inner diameter of the sealed inner chamber (1.1), ρ is the density of the magnetic fluid; n is the operating speed of the main shaft (2); F is the target sealing force between the magnetic fluid and the main shaft (2); L is the inner length of the sealed inner chamber (1.1) along the length direction of the main shaft (2), H is the magnetic field intensity at the sealed inner chamber (1.1); F is the standard sealing force of the magnetic fluid on the main shaft (2).

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