A dry calender

Abstract

The utility model discloses a kind of dry calender, including pre-tightening bearing device and calender roll, both ends of each calender roll are equipped with a group of pre-tightening bearing device;Pre-tightening bearing device includes bearing seat, tapered roller bearing, piston and adjusting assembly, mounting hole is equipped on bearing seat, two tapered roller bearings that are face-to-face superimposed are equipped in mounting hole;The both ends of calender roll are coaxially equipped with rotating shaft;The inner ring of two tapered roller bearings is fixedly sleeved on rotating shaft;The side of bearing seat away from calender roll is equipped with mounting groove, piston is slidably sealed and embedded in mounting groove;Bearing seat is detachably connected with outer end cap;The side of piston is butted with the outer ring of tapered roller bearing through first step, and sealing cavity is formed between the other side and outer end cap;Adjusting assembly is communicated with sealing cavity. Solve the technical problem that the bearing pre-tightening force of existing dry calender is usually fixedly set, and it is difficult to debug, time-consuming and laborious, and the production efficiency is low.

Description

Technical Field

[0001] This utility model relates to the field of bearing preload technology, specifically to a dry rolling mill. Background Technology

[0002] A dry calender is a multi-roll continuous calendering machine that gradually thins the film. Dry calenders typically control the film thickness at each stage by controlling the gap between two calender rolls; therefore, the bearings at both ends of the calender rolls need to remain in a fixed position. Since the calender rolls need to withstand forces in two directions, if there is clearance in their supporting bearings, the calender rolls will move back and forth within that clearance range. Therefore, it is necessary to preload the bearings supporting the calender rolls.

[0003] In related technologies, dry calenders generally need to be compatible with a variety of powder materials, each with different physical properties. For each powder, a corresponding bearing preload is required. However, the bearing preload is usually fixed. After changing the powder material, the operator usually needs to manually readjust the bearing preload, which is difficult, time-consuming, labor-intensive, and results in low production efficiency. Utility Model Content

[0004] This utility model provides a dry calender that solves the technical problem that the bearing preload of existing dry calenders is usually fixed. After changing the powder material, the operator usually needs to manually readjust the bearing preload, which is difficult, time-consuming and labor-intensive, and results in low production efficiency.

[0005] In view of this, the present invention provides a dry calender, including a pre-tightening bearing device and calendering rolls, wherein a set of pre-tightening bearing devices is provided at both ends of each calendering roll.

[0006] The preload bearing device includes a bearing housing, tapered roller bearings, a piston, and an adjusting assembly. The bearing housing has mounting holes, and two tapered roller bearings are installed in the mounting holes, with the two tapered roller bearings stacked face-to-face. Both ends of the calender roll are coaxially provided with rotating shafts. The inner rings of the two tapered roller bearings are fixedly sleeved on the rotating shafts.

[0007] The bearing housing has a mounting groove on the side opposite to the calendering roll, and the piston is slidably and sealingly embedded in the mounting groove; the bearing housing is detachably connected to an outer end cap on the side opposite to the calendering roll; one side of the piston abuts against the outer ring of the tapered roller bearing through a first step, and a sealing cavity is formed between the other side and the outer end cap; the adjusting component communicates with the sealing cavity and is used to fill the sealing cavity with an adjusting medium to drive the piston to move.

[0008] Optionally, the piston includes a first annular portion and a second annular portion, the second annular portion and the first step are respectively disposed on both sides of the first annular portion; the first annular portion is slidably and sealingly embedded in the mounting groove, and an annular groove is formed between the second annular portion and the side wall of the mounting groove, and a third annular portion is provided on the outer end cap corresponding to the annular groove; the third annular portion is slidably and sealingly embedded in the annular groove, and forms the sealing cavity with the annular groove.

[0009] Optionally, a first sealing ring is provided between the first annular portion and the mounting groove.

[0010] Optionally, a second sealing ring is provided between the third annular portion and the mounting groove.

[0011] Optionally, a third sealing ring is provided between the third annular portion and the second annular portion.

[0012] Optionally, the regulating assembly includes a hydraulic pump and an electro-hydraulic proportional valve, and the outer end cover is provided with a pressure oil port communicating with the sealing cavity. The hydraulic pump is connected to the pressure oil port through the electro-hydraulic proportional valve.

[0013] Optionally, the outer end cap is screwed to the bearing housing.

[0014] Optionally, the bearing housing is detachably connected to an inner end cover on the side facing the calendering roll, and the inner end cover is provided with a second step on the side facing the tapered roller bearing, the second step abutting against the outer ring of the rotating shaft.

[0015] Optionally, the inner end cap is screwed to the bearing housing.

[0016] Optionally, a third step and an adjusting nut are sequentially spaced along the direction away from the calendering roll on the rotating shaft. The adjusting nut is threaded onto the rotating shaft. Two tapered roller bearings are disposed between the third step and the adjusting nut, and the inner rings of the two tapered roller bearings abut against the third step and the adjusting nut, respectively.

[0017] The technical solution of this utility model has the following advantages:

[0018] 1. This utility model uses face-to-face tapered roller bearings to support the rotating shaft, and adjusts the pressure of the adjusting medium in the sealed cavity through an adjusting component to drive the piston to adjust the tapered roller bearings, thereby achieving controllable adjustment of the preload. The tapered roller bearings can be adjusted to the corresponding preload according to the different powders being processed. It has a wide range of applications, avoids manual adjustment, is convenient and quick, saves time and effort, reduces adjustment difficulty, and improves production efficiency.

[0019] 2. In this utility model, when a hard object appears in the roll gap of the calender roll, causing a sudden increase in load, the regulating medium in the sealed cavity is compressed by the piston to play an overload protection role, effectively protecting the tapered roller bearing, increasing service life, and reducing the frequency of equipment maintenance.

[0020] 3. The outer end cover of this utility model is detachably connected to the bearing seat, which facilitates installation and maintenance. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the structure of a dry calender provided by this utility model;

[0023] Figure 2 for Figure 1 Sectional view at point AA;

[0024] Figure 3 for Figure 2 Enlarged view of a portion of the image;

[0025] Figure 4 A schematic diagram of the structure of the adjustment component provided by this utility model.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Preload bearing device; 101. Bearing housing; 102. Tapered roller bearing; 103. Outer end cover; 104. Sealing cavity; 105. Piston; 1051. First step; 1052. First annular portion; 1053. Second annular portion; 106. Third annular portion; 107. First sealing ring; 108. Second sealing ring; 109. Third sealing ring; 110. Hydraulic pump; 111. Electro-hydraulic proportional valve; 112. Pressure port; 113. Inner end cover; 114. Second step; 115. Third step; 116. Adjusting nut; 2. Calendering roll; 3. Rotating shaft. Detailed Implementation

[0028] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0032] For this purpose, please refer to Figures 1 to 4 This embodiment provides a dry calender, including a pre-tightening bearing device 1 and calendering rolls 2. Each calendering roll 2 has a set of pre-tightening bearing devices 1 at both ends. The pre-tightening bearing device 1 includes a bearing housing 101, tapered roller bearings 102, a piston 105, and an adjusting assembly. The bearing housing 101 has mounting holes, and two tapered roller bearings 102 are installed in the mounting holes, with the two tapered roller bearings 102 stacked face-to-face. Both ends of the calendering roll 2 are coaxially provided with rotating shafts 3. The inner rings of the two tapered roller bearings 102 are fixed. The piston 105 is slidably and sealed within the mounting groove on the side of the bearing housing 101 away from the calendering roll 2. An outer end cap 103 is detachably connected to the side of the bearing housing 101 away from the calendering roll 2. One side of the piston 105 abuts against the outer ring of the tapered roller bearing 102 through a first step 1051, and a sealing cavity 104 is formed between the other side and the outer end cap 103. An adjusting component communicates with the sealing cavity 104 and is used to fill the sealing cavity 104 with an adjusting medium to drive the piston 105 to move.

[0033] It should be noted that the mounting hole, tapered roller bearing 102, piston 105 and rotating shaft 3 are all coaxially arranged, and the tapered roller bearing 102 is slidably arranged in the mounting hole; the outer rings of the two tapered roller bearings 102 are spaced apart by a preset distance, and the inner rings of the two tapered roller bearings 102 abut against each other; the mounting groove is coaxially arranged with the mounting hole.

[0034] In this embodiment, a set of preload bearing devices 1 are provided at both ends of each calender roll 2. Two tapered roller bearings 102 arranged face-to-face are installed in the mounting holes. The inner rings of the tapered roller bearings 102 are fixedly sleeved on the rotating shaft 3 to support the calender roll 2. When it is necessary to adjust the preload of the preload bearing device 1, the adjusting component fills the sealing cavity 104 with adjusting medium, which increases the pressure of the sealing cavity 104. The space of the sealing cavity 104 increases, causing the piston 105 to move towards the tapered roller bearing 102 and abut against the outer ring of the tapered roller bearing 102 through the first step 1051, thereby changing the preload of the tapered roller bearing 102. Conversely, by reducing the pressure of the sealing cavity 104 through the adjusting component, the piston 105 moves in the opposite direction, and the outer ring of the tapered roller bearing 102 returns to its original position under its own force, thereby changing its preload. Thus, the preload can be controlled and adjusted. The tapered roller bearing 102 can be adjusted to the appropriate position according to the different powders being processed. The preload is appropriate, has a wide range of applications, avoids manual adjustment, is convenient and quick, saves time and effort, reduces adjustment difficulty, and improves production efficiency. Secondly, when a hard block appears at the axial roll gap of the calender roll 2, the axial load on the tapered roller bearing 102 will suddenly increase. When the load is large enough, the force exerted by the outer ring of the tapered roller bearing 102 near the piston 105 on the piston 105 will be greater than the force generated by the regulating medium. The outer ring of the tapered roller bearing 102 will be pushed towards the piston 105, compressing the regulating medium and playing a certain buffering role. At this time, the roll gap of the calender roll 2 will also increase, allowing the hard block to pass through the roll gap smoothly. After the hard block passes, the load decreases, and under the action of the regulating medium, the piston 105 and the outer ring of the tapered roller shaft are returned to their original positions, thus playing an overload protection role, effectively protecting the tapered roller bearing 102, increasing service life, and reducing the frequency of equipment maintenance. In addition, the outer end cover 103 is detachably connected to the bearing housing 101, which facilitates installation and maintenance.

[0035] Specifically, the number of calendering rollers 2 is at least two, so that they can work together to calender a film.

[0036] In one embodiment, such as Figure 3As shown, the piston 105 includes a first annular portion 1052 and a second annular portion 1053. The second annular portion 1053 and the first step 1051 are respectively disposed on both sides of the first annular portion 1052. The first annular portion 1052 is slidably and sealingly embedded in the mounting groove, and an annular groove is formed between the second annular portion 1053 and the side wall of the mounting groove. A third annular portion 106 is provided on the outer end cap 103 corresponding to the annular groove. The third annular portion 106 is slidably and sealingly embedded in the annular groove, and a sealing cavity 104 is formed with the annular groove.

[0037] It should be noted that the outer diameter of the second annular portion 1053 is smaller than the outer diameter of the first annular portion 1052, so as to form an annular groove with the mounting groove; the inner diameters of the first annular portion 1052 and the second annular portion 1053 are both larger than the diameter of the rotating shaft 3.

[0038] In this embodiment, a second annular portion 1053 is provided on the first annular portion 1052 so that the outer wall of the second annular portion 1053 forms an annular groove with the mounting groove, so that the third annular portion 106 on the outer end cover 103 is adapted to slide and fit with the annular groove along the axial direction of the piston 105, and forms a sealing cavity 104, so that the pressure of the regulating medium in the sealing cavity 104 can be adjusted by the adjusting component, thereby driving the piston 105 to move, so as to adjust the preload of the tapered roller bearing 102.

[0039] In one embodiment, such as Figure 3 As shown, a first sealing ring 107 is provided between the first annular portion 1052 and the mounting groove.

[0040] In this embodiment, by providing a first sealing ring 107 between the first annular portion 1052 and the mounting groove, the sealing performance is improved and leakage of the regulating medium is prevented.

[0041] In one embodiment, such as Figure 3 As shown, a second sealing ring 108 is provided between the third annular portion 106 and the mounting groove.

[0042] In this embodiment, by providing a second sealing ring 108 between the third annular portion 106 and the mounting groove, the sealing performance is improved and leakage of the regulating medium is prevented.

[0043] In one embodiment, such as Figure 3 As shown, a third sealing ring 109 is provided between the third annular portion 106 and the second annular portion 1053.

[0044] In this embodiment, by providing a third sealing ring 109 between the third annular portion 106 and the second annular portion 1053, the sealing performance is improved and leakage of the regulating medium is prevented.

[0045] In one embodiment, such as Figure 4As shown, the regulating assembly includes a hydraulic pump 110 and an electro-hydraulic proportional valve 111. The outer end cover 103 is provided with a pressure oil port 112 that communicates with the sealing cavity 104. The hydraulic pump 110 is connected to the pressure oil port 112 through the electro-hydraulic proportional valve 111.

[0046] In this embodiment, the hydraulic pump 110 is connected to the electro-hydraulic proportional valve 111 through a pipeline, and the electro-hydraulic proportional valve 111 is connected to the pressure port 112 through a pipeline. At this time, the regulating medium is hydraulic oil. The hydraulic oil is delivered to the pressure port 112 on the outer end cover 103 through the electro-hydraulic proportional valve 111. The pressure of the hydraulic oil output to the outer end cover 103 can be controlled by modifying the parameters of the electro-hydraulic proportional valve 111 in the program, thereby controlling the preload force.

[0047] As an alternative implementation, the regulating component can be an air pump, in which case the regulating medium is air. The specific choice can be made according to actual needs.

[0048] In one embodiment, such as Figures 2 to 4 As shown, the outer end cap 103 is screwed to the bearing housing 101.

[0049] It should be noted that the outer end cover 103 is provided with a first through hole for the rotating shaft 3 to pass through.

[0050] In this embodiment, the outer end cover 103 is screwed to the bearing seat 101 for easy installation and disassembly.

[0051] In one embodiment, such as Figure 3 As shown, the bearing housing 101 is detachably connected to the inner end cover 113 on the side facing the calender roll 2. The inner end cover 113 is provided with a second step 114 on the side facing the tapered roller bearing 102. The second step 114 abuts against the outer ring of the rotating shaft 3.

[0052] In this embodiment, by setting an inner end cap 113 and using the second step 114 on the inner end cap 113 to abut against the outer ring of the tapered roller bearing 102 near the calendering roll 2, it is possible to limit the movement of the tapered roller bearing 102 and prevent it from moving towards the calendering roll 2, thereby improving stability.

[0053] In one embodiment, such as Figure 3 As shown, the inner end cap 113 is screwed to the bearing housing 101.

[0054] In this embodiment, the inner end cap 113 is screwed to the bearing seat 101 to improve the overall stability.

[0055] In one embodiment, such as Figure 3As shown, a third step 115 and an adjusting nut 116 are sequentially spaced along the direction away from the calendering roll 2 on the rotating shaft 3. The adjusting nut 116 is threaded onto the rotating shaft 3. Two tapered roller bearings 102 are disposed between the third step 115 and the adjusting nut 116, and the inner rings of the two tapered roller bearings 102 abut against the third step 115 and the adjusting nut 116 respectively.

[0056] It should be noted that the rotating shaft 3 is arranged in a stepped manner in the direction away from the calendering roll 2, and the diameter gradually decreases to form the third step 115.

[0057] In this embodiment, during installation, the rotating shaft 3 passes through the inner rings of the two tapered roller bearings 102 until the third step 115 abuts against the inner ring sidewall of the tapered roller bearing 102. Then, an adjusting nut 116 is fitted on the rotating shaft 3 on the side of the tapered roller bearing 102 away from the third step 115, and the adjusting nut 116 is tightened to abut against the inner ring of the tapered roller bearing 102, so that the adjusting nut 116 and the third step 115 cooperate to clamp and fix the inner rings of the two tapered roller bearings 102.

[0058] Specifically, such as Figure 3 As shown, a top ring is provided between the adjusting nut 116 and the inner ring of the tapered roller bearing 102 to improve the stability of the connection.

[0059] Specifically, the first step 1051 can be a continuous ring structure or multiple protrusions spaced apart along the circumference.

[0060] Specifically, the second step 114 can be a continuous ring structure or multiple protrusions spaced apart along the circumference.

[0061] The specific working principle of the dry calender provided in this embodiment is as follows: When it is necessary to adjust the preload of the preload bearing device 1, hydraulic oil is supplied by the hydraulic pump 110, and the hydraulic oil pressure output to the outer end cover 103 is controlled by the electro-hydraulic proportional valve 111, thereby increasing the pressure of the sealing cavity 104. As a result, the third annular part 106 moves relative to the annular groove, increasing the space of the sealing cavity 104. This causes the piston 105 to move towards the tapered roller bearing 102 and abut against the outer ring of the tapered roller bearing 102 through the first step 1051, thereby changing the preload of the tapered roller bearing 102. Conversely, the pressure of the sealing cavity 104 is reduced by controlling the electro-hydraulic proportional valve 111, causing the piston 105 to move in the opposite direction. The outer ring of the tapered roller bearing 102 returns to its original position under its own force, thereby changing its preload, thus achieving controllable adjustment of the preload. When the calender roll 2 is in When a hard block appears at the axial roll gap, the axial load on the tapered roller bearing 102 will suddenly increase. When the load is large enough, the force exerted by the outer ring of the tapered roller bearing 102 near the piston 105 on the piston 105 will be greater than the force generated by the hydraulic oil. The outer ring of the tapered roller bearing 102 will be pushed towards the piston 105, compressing the hydraulic oil and playing a certain buffering role. At this time, the roll gap of the calender roll 2 will also increase, allowing the hard block to pass through the roll gap smoothly. After the hard block passes through, the load decreases, and under the action of the hydraulic oil, the piston 105 and the outer ring of the tapered roller shaft are returned to their original positions, thus playing the role of overload protection. This solves the technical problem that the bearing preload of the existing dry calender is usually fixed, and after changing the powder material, the operator usually needs to manually readjust the bearing preload, which is difficult to adjust, time-consuming and labor-intensive, and has low production efficiency.

[0062] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A dry calendering mill, characterized in that, It includes a pre-tightening bearing device (1) and a calendering roll (2), with a set of pre-tightening bearing devices (1) provided at both ends of each calendering roll (2); The preload bearing device (1) includes a bearing housing (101), a tapered roller bearing (102), a piston (105), and an adjusting assembly. The bearing housing (101) is provided with mounting holes, and two tapered roller bearings (102) are provided in the mounting holes, with the two tapered roller bearings (102) stacked face to face. Both ends of the calendering roll (2) are coaxially provided with rotating shafts (3). The inner rings of the two tapered roller bearings (102) are fixedly sleeved on the rotating shafts (3). The bearing housing (101) has an installation groove on the side away from the calendering roll (2), and the piston (105) is slidably and sealingly embedded in the installation groove; the bearing housing (101) is detachably connected to an outer end cap (103) on the side away from the calendering roll (2); one side of the piston (105) abuts against the outer ring of the tapered roller bearing (102) through a first step (1051), and a sealing cavity (104) is formed between the other side and the outer end cap (103); the adjusting component communicates with the sealing cavity (104) and is used to fill the sealing cavity (104) with an adjusting medium to drive the piston (105) to move.

2. The dry calender according to claim 1, characterized in that, The piston (105) includes a first annular portion (1052) and a second annular portion (1053), the second annular portion (1053) and the first step (1051) are respectively disposed on both sides of the first annular portion (1052); the first annular portion (1052) is slidably and sealingly embedded in the mounting groove, and an annular groove is formed between the second annular portion (1053) and the side wall of the mounting groove; the outer end cap (103) is provided with a third annular portion (106) corresponding to the annular groove; the third annular portion (106) is slidably and sealingly embedded in the annular groove, and forms the sealing cavity (104) with the annular groove.

3. The dry calender according to claim 2, characterized in that, A first sealing ring (107) is provided between the first annular portion (1052) and the mounting groove.

4. The dry calender according to claim 2, characterized in that, A second sealing ring (108) is provided between the third annular portion (106) and the mounting groove.

5. The dry calender according to claim 2, characterized in that, A third sealing ring (109) is provided between the third annular portion (106) and the second annular portion (1053).

6. The dry calender according to claim 1, characterized in that, The regulating assembly includes a hydraulic pump (110) and an electro-hydraulic proportional valve (111). The outer end cover (103) is provided with a pressure port (112) that communicates with the sealing cavity (104). The hydraulic pump (110) is connected to the pressure port (112) through the electro-hydraulic proportional valve (111).

7. The dry calender according to claim 1, characterized in that, The outer end cap (103) is screwed to the bearing seat (101).

8. The dry calender according to claim 1, characterized in that, The bearing housing (101) is detachably connected to an inner end cap (113) on the side facing the calendering roll (2). The inner end cap (113) has a second step (114) on the side facing the tapered roller bearing (102). The second step (114) abuts against the outer ring of the rotating shaft (3).

9. The dry calender according to claim 8, characterized in that, The inner end cap (113) is screwed to the bearing seat (101).

10. The dry calender according to any one of claims 1 to 9, characterized in that, The rotating shaft (3) is provided with a third step (115) and an adjusting nut (116) spaced apart in a direction away from the calendering roll (2). The adjusting nut (116) is threaded onto the rotating shaft (3). Two tapered roller bearings (102) are disposed between the third step (115) and the adjusting nut (116), and the inner rings of the two tapered roller bearings (102) abut against the third step (115) and the adjusting nut (116) respectively.

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