A sterile capping head

Abstract

In order to solve the problems in the prior art that the structure of the screw capping head is relatively complex, the sealing structure is not easy to adjust, and the sealing effect is poor, the present invention provides an aseptic screw capping head, including a first shell, a second shell, a rotating shaft, and a bearing assembly, wherein the second shell is provided with a first step, one end of the first shell is sleeved on the upper part of the second shell, and a first sealing ring is provided between one end face of the first shell and the end face of the first step; a support seat is installed at the open end of the second shell, and a sealing assembly is provided between the rotating shaft and the support seat, the sealing assembly includes a mounting ring, a pressure ring, and a sealing ring, the sealing ring is sleeved on the rotating shaft, the mounting ring is installed on the support seat, the pressure ring is installed between the mounting ring and the sealing ring, and the bearing assembly and the sealing assembly jointly support the rotating shaft. The present invention can adjust the installation state of the sealing structure according to actual use conditions, thereby achieving a better sealing effect, reducing the number of bearings, and simplifying the overall structure.

Description

Technical Field

[0001] The invention belongs to the technical field of capping machine accessories, in particular to an aseptic capping head. Background Art

[0002] The capping head is one of the important components of the capping machine. In the prior art, the outer shell of the capping head is generally divided into two parts, and the connection between the two parts is sealed. See the comparative document CN115180576A: It can be seen that the connection between the outer shell and the adjustment sleeve in the comparative document adopts a side sealing structure. The sealing pressure of the sealing structure is only guaranteed by the inner diameter of the outer shell and the outer diameter of the adjustment sleeve, and cannot be adjusted according to actual usage. In addition, the sealing structure will form a large gap due to processing errors, which is not conducive to maintaining a sterile environment for the capping head, is prone to breeding bacteria, or forms dead corners, resulting in inadequate sterilization.

[0003] In addition, current screw capping heads are generally equipped with two bearing assemblies to support the rotating shaft, which has a relatively complex structure. Moreover, the sealing assembly structure of the rotating shaft of the screw capping head at the end extending from the housing is highly correlated with the shaft / bearing assembly structure. Generally, the installation of the seal needs to rely on the bearing seat, making the seal assembly structure unable to be independent of the bearing-rotating shaft assembly structure. This makes it inconvenient to adjust the installation status of the seal, and it is impossible to achieve the best sealing effect. Moreover, when replacing the seal at this location, it is easy to affect the installation status of the bearing. Summary of the Invention

[0004] In order to solve the problems in the prior art that the structure of the screw capping head is relatively complex, the sealing structure is not easy to adjust, and the sealing effect is poor, the present invention provides a sterile screw capping head. By changing the sealing structure between the shells into an end face seal, and separately arranging the sealing structure between the shell and the rotating shaft, the association with the bearing / shaft mounting structure is reduced, and the installation state of the sealing structure can be adjusted according to actual usage conditions, thereby achieving a better sealing effect, reducing the number of bearings, and simplifying the overall structure.

[0005] The present invention provides an aseptic capping head, and its technical solution for solving the technical problem includes a first shell, a second shell, a rotating shaft, and a bearing assembly. The rotating shaft is installed in the first shell and the second shell and one end extends out of the second shell. A first step is provided on the outer wall of the second shell. One end of the first shell is sleeved on the upper part of the second shell. A first sealing ring is provided between one end face of the first shell and the end face of the first step; the bearing assembly is installed inside the second shell, and a support seat is installed at the open end of the second shell. A sealing assembly is provided between the rotating shaft and the support seat, and the sealing assembly includes a mounting ring, a pressure ring and a sealing ring. The sealing ring is sleeved on the rotating shaft, the mounting ring is installed on the support seat, and the pressure ring is installed between the mounting ring and the sealing ring. The bearing assembly and the sealing assembly jointly support the rotating shaft.

[0006] In this technical solution, the side sealing structure between the existing shells is changed to an end face sealing structure using a first sealing ring, which avoids the problem of poor sealing effect caused by processing gap error, and in actual use, the pressure between the first shell and the first step can be adjusted as needed, thereby achieving the adjustment of the pressing force of the first sealing ring to achieve a better sealing effect; by designing an independently arranged sealing component, the sealing component is installed through a support seat and does not need to rely on the bearing installation structure (bearing seat). It can adjust the installation state as needed, and is easy to install and disassemble, and will not affect the matching relationship at the bearing, making it easy to adjust the sealing effect and achieving a better sealing effect. In addition, the sealing component in this application can play a role in assisting the support of the rotating shaft. Compared with the design of two sets of bearing components in the prior art, the sealing component replaces the position and function of one bearing component, reduces the number of bearing components, and simplifies the overall structure of the screw capping head.

[0007] Preferably, one end of the support base is located within the second housing, and the other end of the support base extends out of the second housing. A second step is provided on the outer wall of the support base, and a second sealing ring is provided between one end surface of the second housing and the end surface of the second step. Similarly, the existing side seal is replaced with an end seal to facilitate adjustment of the sealing state.

[0008] Preferably, the support seat is provided with a first mounting cavity for mounting the mounting ring, a first supporting surface is formed on the bottom wall of the mounting cavity, a second mounting cavity is provided at one end of the mounting ring for mounting the pressure ring and the sealing ring, the bottom wall of the second mounting cavity forms a second supporting surface, the first supporting surface and the second supporting surface are arranged opposite to each other, one end face of the pressure ring is positioned by the first supporting surface, one end face of the sealing ring is positioned by the second supporting surface, the outer side wall of the pressure ring fits with the inner side wall of the second mounting cavity, and the inner side wall of the pressure ring fits with the outer side wall of the sealing ring. The first mounting cavity and the second mounting cavity together form an installation space, and the pressure ring and the sealing ring are installed in this area, supported by the bottom walls of the first mounting cavity and the second mounting cavity, and in conjunction with the action of the intermediate pressure ring, the sealing ring is finally well fitted on the surface of the rotating shaft, achieving a better sealing effect.

[0009] Preferably, a third step is provided on the inner sidewall of the pressure ring, and a fourth step is provided on the outer sidewall of the sealing ring. The stepped surface of the third step is in contact with the stepped surface of the fourth step, and the stepped surface of the third step and the second supporting surface mutually press the two end surfaces of the fourth step to thereby press the sealing ring. This makes the position of the sealing ring more stable, prevents loosening due to the rotation of the shaft during use, and achieves a better sealing effect.

[0010] Preferably, a K-shaped sealing portion is provided on the inner side of the sealing ring. The K-shaped sealing portion forms two sealing bands between the sealing ring and the rotating shaft, thereby achieving bidirectional sealing / double sealing.

[0011] Preferably, the end surface of the first housing is fitted with the step surface of the first step, and a first mounting groove for mounting the first sealing ring is provided on the end surface of the first housing, so that the mounting of the first sealing ring is more stable.

[0012] Preferably, the end surface of the second housing fits in contact with the stepped surface of the second step, and a second mounting groove for mounting the second sealing ring is provided on the end surface of the second housing, so that the mounting of the second sealing ring is more stable.

[0013] In summary, the technical solution of the present invention has at least the following beneficial effects:

[0014] 1. By designing the end face seal between the first shell and the second shell, the problem of poor sealing effect caused by dimensional error in the side seal is reduced. At the same time, the sealing pressure can be adjusted according to actual conditions to achieve better sealing effect;

[0015] 2. By designing an independently arranged sealing component, the reliance on the bearing installation structure is reduced, making it easier to adjust the installation status of the sealing ring and achieve a better sealing effect;

[0016] 3. The design of the mounting ring and pressure ring in the sealing assembly makes the installation structure of the sealing ring more stable and the fit with the rotating shaft is better;

[0017] 4. By designing the K-shaped sealing part on the sealing ring, double sealing / bidirectional sealing effect can be achieved;

[0018] 5. The sealing assembly in the present application can assist in supporting the rotating shaft. Compared with the prior art, it reduces the number of bearing assemblies and simplifies the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is the front view of the present invention;

[0021] Figure 2 It is a front cross-sectional view of the present invention;

[0022] Figure 3 It is a stereogram of the present invention;

[0023] Figure 4 This invention Figure 2 Enlarged view of point A in the middle;

[0024] Figure 5 This invention Figure 2 Enlarged view of point B in the middle;

[0025] Figure 6 This invention Figure 2 Enlarged view of point C in the middle.

[0026] In the figure, 1. first shell; 11. first mounting groove; 2. second shell; 21. first step; 22. second mounting groove; 3. rotating shaft; 4. first sealing ring; 5. supporting seat; 51. second step; 52. first supporting surface; 6. sealing assembly; 61. mounting ring; 612. second supporting surface; 62. pressure ring; 621. third step; 63. sealing ring; 631. fourth step; 7. second sealing ring; 8. bearing assembly. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] The present invention provides a sterile capping head, see attached Figure 1-6 , including a first shell 1, a second shell 2, and a rotating shaft 3, wherein the rotating shaft 3 is installed in the first shell 1 and the second shell 2 and one end extends out of the second shell 2, a first step 21 is provided on the outer wall of the second shell 2, one end of the first shell 1 is sleeved on the upper part of the second shell 2, and a first sealing ring 4 is provided between one end face of the first shell 1 and the end face of the first step 21; a part of the second shell 2 is inside the first shell 1, and the internal space of the first shell 1 and the second shell 2 is used as other additional installation space, and a first sealing ring 4 is provided on the end face of the joint of the first shell 1 and the second shell 2, and the first sealing ring 4 can be an O-ring, wherein a first mounting groove 11 is provided on the end face of the first shell 1, and the first sealing ring 4 is installed in the first mounting groove 11 In this way, an end face sealing structure is formed between the first step 21 of the first shell 1 and the second shell 2. Compared with the side seal in the prior art, it avoids the problem of poor sealing effect caused by machining gap error, and in actual use, the pressure between the first shell 1 and the first step 21 can be adjusted as needed, thereby adjusting the pressing force of the first sealing ring 4 to achieve a better sealing effect. In addition, the present application is provided with a support seat 5 at the open end of the second shell 2, and a sealing assembly 6 is provided between the rotating shaft 3 and the support seat 5. The sealing assembly 6 includes a mounting ring 61, a pressure ring 62 and a sealing ring 63. The sealing ring 63 is sleeved on the rotating shaft 3, the mounting ring 61 is mounted on the support seat 5, and the pressure ring 62 is mounted between the mounting ring 61 and the sealing ring 63. The sealing assembly 6 in the present application is a separately installed component used to seal the axial direction of the rotating shaft 3. The sealing assembly 6 is installed through the support seat 5 and does not need to rely on the bearing mounting structure (bearing seat). Therefore, the installation state can be adjusted as needed, and the installation and disassembly are convenient, and the matching relationship at the bearing is not affected. It is convenient to adjust the sealing effect and can achieve a better sealing effect.

[0029] In addition, see the attached Figure 2It can be seen that only one bearing assembly 8 is provided in the present application, and the bearing assembly 8 is installed inside the second shell 2, and the sealing assembly 6 is installed at the opening of the second shell 2; there is a certain interval between the sealing assembly 6 and the bearing assembly 8. In actual use, the structure of the sealing assembly 6 can play an auxiliary role in supporting the rotating shaft 3 (realizing part of the function of the bearing assembly 8). Compared with the screw capping head in the prior art, the number of bearing assemblies 8 is reduced, and the overall structure is simplified.

[0030] When the sealing assembly 6 is installed, a first installation cavity for installing the installation ring 61 is provided on the support seat 5, and a first supporting surface 52 is formed on the bottom wall of the installation cavity. A second installation cavity for installing the pressure ring 62 and the sealing ring 63 is provided at one end of the installation ring 61, and a second supporting surface 612 is formed on the bottom wall of the second installation cavity. The first supporting surface 52 and the second supporting surface 612 are arranged opposite to each other, and one end face of the pressure ring 62 is positioned by the first supporting surface 52, and one end face of the sealing ring 63 is positioned by the second supporting surface 612. The outer side wall of the pressure ring 62 is in contact with the inner side wall of the second installation cavity, and the inner side wall of the pressure ring 62 is in contact with the outer side wall of the sealing ring 63. A third step 621 is provided on the inner wall of the pressure ring 62, and a fourth step 631 is provided on the outer wall of the sealing ring 63. The step surface of the third step 621 is in contact with the step surface of the fourth step 631. The step surface of the third step 621 and the second support surface 612 squeeze the two end surfaces of the fourth step 631 against each other to tighten the sealing ring 63. The first installation cavity and the second installation cavity together form an installation space, and the pressure ring 62 and the sealing ring 63 are installed in this area. During assembly, the installation order in the radial direction is: support seat 5, installation ring 61, pressure ring 62, sealing ring 63, rotating shaft 3. The inner wall of the sealing ring 63 directly fits the outer wall of the rotating shaft 3 to form a seal. The pressure ring 62 acts as an intermediate piece, and its two side surfaces are in contact with the inner side surface of the installation ring 61 and the outer side surface of the sealing ring 63 respectively, and the sealing ring 63 is pressed on the rotating shaft 3 by the extrusion effect. In the axial direction, the third step 621, the first support surface 52, and the second support surface 612 of the pressure ring 62 cooperate with each other to achieve the compression of the fourth step 631 on the sealing ring 63, thereby achieving the fixation of the axial position of the sealing ring 63. In summary, through the assembly structure in the axial and radial directions, the sealing ring 63 can better fit the rotating shaft 3 in the radial direction, and the position in the axial direction is also well fixed, so as to achieve a more stable sealing effect.

[0031] To achieve a better sealing effect, one end of the support seat 5 of the present application is located within the second housing 2, and the other end of the support seat 5 extends out of the second housing 2. A second step 51 is provided on the outer wall of the support seat 5. A second sealing ring 7, which can be an O-ring, is provided between one end face of the second housing 2 and the end face of the second step 51. Similarly, the side seal in the prior art is replaced with an end face seal, which facilitates adjustment of the sealing state.

[0032] To further improve the sealing effect, see the attached Figure 6 , a K-shaped sealing portion is provided on the inner side of the sealing ring 63. The K-shaped sealing portion forms two sealing belts between the sealing ring 63 and the rotating shaft 3, which can realize sealing from the outside to the inside along the axial direction of the rotating shaft 3, and can also realize sealing from the inside to the outside. Moreover, the formation of two sealing belts can achieve a double sealing effect, realizing a two-way sealing and a double sealing effect. In order to make the installation of the sealing ring more stable and achieve a better sealing effect, the end face of the first shell 1 of the present application fits with the step surface of the first step 21, and a first mounting groove 11 for installing the first sealing ring 4 is provided on the end face of the first shell 1. The end face of the second shell 2 fits with the step surface of the second step 51, and a second mounting groove 22 for installing the second sealing ring 7 is provided on the end face of the second shell 2.

[0033] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A sterile capping head, comprising a first housing, a second housing, a rotating shaft, and a bearing assembly, wherein the rotating shaft is installed in the first housing and the second housing and one end extends out of the second housing, characterized in that: The outer wall of the second shell is provided with a first step, one end of the first shell is sleeved on the upper part of the second shell, and a first sealing ring is provided between one end surface of the first shell and the end surface of the first step; the bearing assembly is installed in the interior of the second shell, and a support seat is installed at the open end of the second shell, and a sealing assembly is provided between the rotating shaft and the support seat, and the sealing assembly includes a mounting ring, a pressure ring and a sealing ring, and the sealing ring is sleeved on the rotating shaft, the mounting ring is installed on the support seat, and the pressure ring is installed between the mounting ring and the sealing ring, and the bearing assembly and the sealing assembly jointly support the rotating shaft. One end of the support seat is located in the second shell, and the other end of the support seat extends out of the second shell, a second step is provided on the outer wall of the support seat, and a second sealing ring is provided between one end surface of the second shell and the end surface of the second step. The support seat is provided with a first mounting cavity for mounting the mounting ring, and a first supporting surface is formed on the bottom wall of the first mounting cavity, and one end of the mounting ring is provided with a The second mounting cavity for installing the pressure ring and the sealing ring, the bottom wall of the second mounting cavity forms a second supporting surface, the first supporting surface and the second supporting surface are arranged facing each other, one end face of the pressure ring is positioned by the first supporting surface, and one end face of the sealing ring is positioned by the second supporting surface, the outer wall of the pressure ring is in contact with the inner wall of the second mounting cavity, the inner wall of the pressure ring is in contact with the outer wall of the sealing ring, a third step is provided on the inner wall of the pressure ring, and a fourth step is provided on the outer wall of the sealing ring, the step surface of the third step is in contact with the step surface of the fourth step, the step surface of the third step and the second supporting surface squeeze the two end surfaces of the fourth step to achieve compression of the sealing ring, the end face of the first shell and the step surface of the first step are in contact with each other, a first mounting groove for installing the first sealing ring is provided on the end face of the first shell, the end face of the second shell and the step surface of the second step are in contact with each other, and a second mounting groove for installing the second sealing ring is provided on the end face of the second shell.

2. The aseptic capping head according to claim 1, characterized in that: A K-shaped sealing portion is provided on the inner side of the sealing ring.

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