A new type of freeze-dryer manual capping device structure

Abstract

The utility model relates to a freeze drier gland device technical field, concretely relates to a novel freeze drier manual gland device structure, include: screw rod, support isolation mechanism, including support, bearing seat and bearing, support and bearing seat all cover the screw rod axle shoulder department, bearing is provided with two, two bearings are located in bearing seat, and are connected with screw rod rotation, rotating mechanism, rotating mechanism includes transmission part and rotating part, and rotating part cover sets up one end of screw rod, and transmission part is located in screw rod and rotating part junction, sealing mechanism, be located in the support, cover set up the outer surface of screw rod, sealing mechanism is provided with several, several sealing mechanism and screw rod sealed connection, and two sealing mechanism direction opposite direction, guide mechanism, with screw rod fixed connection, and guide mechanism is located in the other end of screw rod, the utility model improves the screw rod stability, has reduced the risk of leakage.

Description

Technical Field

[0001] This utility model relates to the technical field of freeze dryer capping devices, and more specifically, to a novel manual capping device structure for a freeze dryer. Background Technology

[0002] The capping device of a freeze dryer is a key auxiliary subsystem inside the freeze dryer. Its core function is to automatically press a sealing plug into and seal the opening of the container placed on the freeze dryer shelf under vacuum or inert gas environment after the freeze-drying process is completed. This step is completed inside the freeze-drying chamber without removing the semi-finished product exposed to ambient air.

[0003] However, existing freeze dryer capping devices have insufficient sealing or potential leakage points. Specifically, at the dynamic seal point (i.e., the support position) where the lead screw passes through the drying chamber wall, air can seep into the drying chamber through the gap between the lead screw and the chamber during the capping process or the vacuum maintenance phase, contaminating the freeze-dried product. Furthermore, existing freeze dryer capping devices lack bidirectional axial phase function, meaning that the lead screw may move axially or shift when bearing the weight of the movable plate or the capping force, leading to uneven capping force and problems such as poor bottle stopper sealing.

[0004] The purpose of this invention is to provide a novel manual capping device structure for a freeze dryer to solve the problems existing in the prior art. Utility Model Content

[0005] To achieve the above objectives, this utility model provides the following solution:

[0006] This utility model provides a novel manual capping device structure for a freeze dryer, comprising:

[0007] Lead screw;

[0008] The supporting isolation mechanism includes a support, a bearing housing, and a bearing. The support and the bearing housing are both sleeved on the shoulder of the lead screw shaft, and the bearing housing is fixedly connected to the support. There are two bearings, which are located inside the bearing housing and are rotatably connected to the lead screw.

[0009] A rotating mechanism, comprising a transmission part and a rotating part, wherein the rotating part is sleeved on one end of the lead screw and is fixedly connected to the lead screw, and the transmission part is located at the connection between the lead screw and the rotating part and is fixedly connected to the lead screw and the rotating part;

[0010] A sealing mechanism is located inside the support and sleeved on the outer surface of the lead screw. Several sealing mechanisms are provided, and several sealing mechanisms are sealed to the lead screw, with two sealing mechanisms facing opposite directions.

[0011] A guide mechanism is fixedly connected to the lead screw, and the guide mechanism is located at the other end of the lead screw.

[0012] Furthermore, the sealing mechanism includes a first sealing gasket, a first sealing groove, and a first sealing ring. The top of the first sealing gasket is fixedly connected to the first sealing ring, and the first sealing groove is equidistantly disposed on the outside of the first sealing ring.

[0013] Furthermore, the sealing mechanism also includes a spring, which is annularly sleeved within the first sealing groove.

[0014] Furthermore, the rotating part includes a handwheel and a pressure plate, the handwheel is fixedly connected to the pressure plate, and the pressure plate is fixedly connected to the lead screw through the transmission part.

[0015] Furthermore, the transmission part includes a flat key, which is located inside the handwheel and is fixedly connected to the lead screw.

[0016] Furthermore, the guiding mechanism includes a guide ring, a guide rod, a shaft end flange, and a nut. The guide ring is fixedly connected to the support. The guide ring is sleeved on one end of the guide rod and is fixedly connected to the guide rod. The end of the guide rod away from the guiding mechanism is fixedly connected to the lead screw by the nut. The shaft end flange is fixedly connected to the guide rod and is located at the end of the guide rod away from the guide ring.

[0017] Furthermore, the guiding mechanism also includes an O-ring and a nut, with the O-ring fitted at the connection between the guide ring and the support.

[0018] Furthermore, the bearing housing is also provided with an end cover and a bearing spacer. The bearing spacer is located between the two bearings, and the two end faces of the bearing spacer are respectively in contact with the inner ring end faces of the two bearings. The end cover is fixedly connected to the bearing near the handwheel.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model adopts two sets of independent sealing mechanisms facing opposite directions at the key dynamic sealing point where the lead screw passes through the drying chamber, namely the support. The lip of the inner sealing mechanism faces the drying chamber, and the pressure difference enhances the clamping force under negative pressure environment, completely sealing the vacuum leakage channel and ensuring the stability of the vacuum degree required by the process. The lip of the outer sealing mechanism faces away from the drying chamber, effectively blocking the intrusion of external dust, particles and moisture, maintaining the cleanliness of the chamber. The reverse synergistic effect of the double sealing mechanism reduces the failure risk of the single seal under bidirectional pressure difference and improves the dynamic seal between the rotating lead screw and the static chamber. Two sets of bearings are symmetrically installed at the shoulder of the lead screw. Through the composite support structure of the bearing housing and the support, the inner ring of the bearing is tightly attached to both sides of the shoulder, eliminating the axial movement of the lead screw and avoiding uneven sealing pressure caused by displacement deviation during the compression process. The bearing assembly forms a mechanical self-locking structure, which can independently bear the entire weight of the moving plate even if the transmission is interrupted unexpectedly, reducing the risk of fall accidents and ensuring the safety of personnel and equipment. The separate structure of the support and the bearing housing ensures the coaxial accuracy of the bearing installation and disperses stress through rigid connection. The structure of the bearing built into the bearing housing allows the radial / axial load to be efficiently transmitted along the path from the support to the bearing housing to the outer ring of the bearing to the rolling element to the lead screw, reducing the risk of local deformation and extending the life of the lead screw. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0021] Figure 1 A cross-sectional schematic diagram of the structure of the novel manual capping device for a freeze dryer provided in this embodiment of the present invention;

[0022] Figure 2 This is a side view of the corner template mechanism in the structure of the novel freeze dryer manual capping device provided in this embodiment of the utility model;

[0023] Figure 3 This utility model provides a schematic diagram of the position of the plate layers in the structure of the novel freeze dryer manual capping device.

[0024] The components are as follows: 1. Lead screw; 2. Support and isolation mechanism; 210. Support; 220. Bearing seat; 230. Bearing; 3. Rotating mechanism; 310. Handwheel; 320. Pressure plate; 330. Flat key; 4. Sealing mechanism; 410. First sealing gasket; 420. First sealing groove; 430. First sealing ring; 440. Spring; 5. Guide mechanism; 510. Guide ring; 520. Guide rod; 530. Shaft end flange; 540. Nut; 550. O-ring seal; 560. Nut; 6. End cover; 7. Bearing spacer; 8. Drying chamber; 9. Plate layer. Detailed Implementation

[0025] The embodiments of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0026] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0027] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] See Figure 1-3 As shown, this embodiment provides a novel manual capping device structure for a freeze dryer, comprising:

[0030] Lead screw 1.

[0031] The supporting isolation mechanism 2 includes a support 210, a bearing seat 220, and a bearing 230. The support 210 and the bearing seat 220 are both sleeved on the shoulder of the lead screw 1, and the bearing seat 220 is fixedly connected to the support 210. There are two bearings 230, which are located inside the bearing seat 220 and are rotatably connected to the lead screw 1.

[0032] The rotating mechanism 3 includes a transmission part and a rotating part. The rotating part is sleeved on one end of the lead screw 1 and is fixedly connected to the lead screw 1. The transmission part is located at the connection between the lead screw 1 and the rotating part and is fixedly connected to the lead screw 1 and the rotating part.

[0033] The sealing mechanism 4 is located inside the support 210 and is sleeved on the outer surface of the lead screw 1. Several sealing mechanisms 4 are provided, and several sealing mechanisms 4 are sealed to the lead screw 1, with two sealing mechanisms 4 facing opposite directions.

[0034] The guide mechanism 5 is fixedly connected to the lead screw 1, and the guide mechanism 5 is located at the other end of the lead screw 1.

[0035] Specifically, the two ends of the lead screw 1 are fixedly connected to a rotating mechanism 3 and a guiding mechanism 5, respectively. When it is necessary to press the plug, the rotating part is rotated, and then the rotating part transmits the torque to the lead screw 1 through the transmission part. The lead screw 1 rotates, driving the guiding mechanism 5 to move. The guiding mechanism 5 then drives the movable plate 9 of the drying chamber 8 to rise or fall, realizing the pressing action. In addition, two sealing mechanisms 4 in opposite directions are provided at the support 210. When the lead screw 1 shaft rotates, the vacuum cannot be leaked from the sealing mechanism 4, thus achieving the vacuum sealing effect and preventing external dust particles from entering the drying chamber 8 through the pressing device. On one side of the sealing mechanism 4, that is, in the direction close to the rotating mechanism 3, bearings 230 are respectively installed at both ends of the shoulder of the lead screw 1 shaft. During use, this not only prevents the lead screw 1 shaft from moving axially in both directions when rotating, but also prevents the lead screw 1 from driving the movable plate 9 to fall when stationary or during use, ensuring safe use.

[0036] Understandably, the two sets of opposing sealing mechanisms 4 installed at support 210 form a synergistic barrier. The inner sealing lip utilizes the negative pressure environment to enhance the sealing force, eliminating the risk of vacuum leakage and ensuring the stability of the core vacuum required for the freeze-drying process. The outer sealing lip actively intercepts external dust, moisture, and microorganisms, maintaining the cleanliness level of the drying chamber 8. The opposing complementary structure of the double seals solves the pressure differential adaptability defects of the single-point seal of the rotating shaft. The dustproof function of the sealing mechanism 4 is independent of the vacuum seal. Its lip and the interference fit with the lead screw 1 form a particulate-level filtration barrier, isolating external contaminants from entering the clean chamber through the moving parts and reducing the risk of product contamination. The high-load bearings 230 installed at both ends of the lead screw 1 shaft shoulder form a mechanical hard protection. The bidirectional fit between the inner ring of the bearing 230 and the shaft shoulder locks the axial degree of freedom of the lead screw 1, avoiding sealing pressure fluctuations caused by displacement deviation during the compression process. The bearing 230-shoulder structure forms a purely mechanical self-locking mechanism, which can still independently bear the entire weight of the movable plate 9 even if the transmission is interrupted (such as when the handwheel 310 is disengaged), reducing the risk of falling accidents.

[0037] In some embodiments of this application, the sealing mechanism 4 includes a first sealing gasket 410, a first sealing groove 420, and a first sealing ring 430. The top of the first sealing gasket 410 is fixedly connected to the first sealing ring 430, and the first sealing groove 420 is equidistantly disposed on the outer side of the first sealing ring 430.

[0038] In some embodiments of this application, the sealing mechanism 4 further includes a spring 440, which is annularly sleeved within the first sealing groove 420.

[0039] Understandably, the first sealing gasket 410, acting as the base, provides a primary static seal with the surface of the lead screw 1 shaft, blocking macroscopic leakage channels. The first sealing ring 430, acting as the dynamic sealing body, has its elastic lip tightly fitted with the rotating lead screw 1, forming a secondary dynamic sealing barrier. The nested design of the two-stage seal achieves separation of static and dynamic sealing functions, reducing the risk of overall leakage due to a single failure. The annular spring 440 is nested within the first sealing groove 420, applying a constant radial preload to the sealing ring, continuously compensating for the elastic decay and lip wear caused by long-term friction, maintaining stable sealing pressure throughout the entire life cycle, avoiding the limitations of traditional seals that rely on material resilience, and is particularly suitable for material hardening scenarios under harsh conditions such as low temperature and vacuum. The first sealing groove 420 is equidistantly arranged along the circumference of the sealing ring, ensuring that the preload of the spring 440 is evenly transmitted to the entire sealing lip, while eliminating seal ring wear or deformation caused by local pressure concentration, ensuring consistent sealing throughout the entire circumference. Furthermore, the elastic energy storage characteristics of spring 440 allow the sealing ring to passively expand and contract when the lead screw 1 experiences radial runout or slight wobbling, adaptively compensating for shaft vibration and assembly tolerances, and avoiding seal failure or shaft surface damage caused by hard contact. The structure of the spring 440 with a built-in sealing groove isolates the external medium from direct contact with the spring 440, preventing corrosive gases, condensate, or particles from intruding and causing the spring 440 to rust / stick, thus improving the environmental tolerance of the sealing mechanism 4.

[0040] In some embodiments of this application, the rotating part includes a handwheel 310 and a pressure plate 320. The handwheel 310 is fixedly connected to the pressure plate 320, and the pressure plate 320 is fixedly connected to the lead screw 1 through a transmission part.

[0041] In some embodiments of this application, the transmission part includes a flat key 330, which is located inside the handwheel 310 and is fixedly connected to the lead screw 1.

[0042] Understandably, the pressure plate 320, acting as the physical medium between the handwheel 310 and the lead screw 1, transmits the operator's applied torque to the transmission unit without elastic deformation through a large-area contact surface. The rigid engagement of the flat key 330 with the keyway of the lead screw 1 eliminates the risk of micro-slippage associated with traditional threaded connections or pin drives, ensuring that torque is converted into rotational power for the lead screw 1. The rectangular cross-section design of the flat key 330 provides ultra-high shear strength, capable of withstanding sudden resistance peaks at the end of the pressure plug. The pressure plate 320's enveloping fixation of the handwheel 310 disperses local stress, preventing the spokes of the handwheel 310 from breaking due to instantaneous overload. The dual fixed connection between the pressure plate 320 and the handwheel 310, and between the flat key 330 and the lead screw 1, constitutes a mechanical interlock. Even if the fasteners of the handwheel 310 loosen, the pressure plate 320 still drives the lead screw 1 through the flat key 330. If the flat key 330 wears abnormally, the rigid contact between the pressure plate 320 and the lead screw 1 provides an alternative force transmission path.

[0043] The dual insurance mechanism prevents operational disruptions and avoids process accidents caused by interruptions in the plugging action.

[0044] In some embodiments of this application, the guide mechanism 5 includes a guide ring 510, a guide rod 520, a shaft end flange 530, and a nut 560. The guide ring 510 is fixedly connected to the support 210. The guide ring 510 is sleeved on one end of the guide rod 520 and is fixedly connected to the guide rod 520. The guide rod 520 is fixedly connected to the end of the lead screw 1 away from the guide mechanism 5 by the nut 560. The shaft end flange 530 is fixedly connected to the guide rod 520 and is located at the end of the guide rod 520 away from the guide ring 510.

[0045] In some embodiments of this application, the guide mechanism 5 further includes an O-ring 550 and a nut 560, with the O-ring 550 sleeved at the connection between the guide ring 510 and the support 210.

[0046] Understandably, the rigid fixation of the guide ring 510 and the support 210 establishes a precise motion reference, constrains the radial degree of freedom of the guide rod 520, and ensures pure axial displacement output by combining the rigid connection between the guide rod 520 and the nut 560 of the lead screw 1, completely eliminating the trajectory deviation caused by the lateral load of the moving plate 9. The shaft end flange 530, as a terminal load-sharing structure, diffuses the pressure plug stress, compensates for the planar error of the plate 9, and avoids local jamming. The O-ring seal 550 forms an adaptive static seal at the interface of the guide ring 510 and the support 210, independently blocking vacuum leakage along the fixed gap, and forming a spatially separated sealing chain with the rotary dynamic seal of the lead screw 1. The double nuts 560, locked in top position, and the physical limit of the shaft end flange 530 form a three-level anti-loosening barrier to resist vibration and overtravel impact. The modular design of the guide rod 520-flange assembly supports quick replacement, the independent encapsulation of the O-ring enables in-situ maintenance, and the wear-resistant bushing and adjustable thread pair actively compensate for wear clearance, significantly extending the service life of the mechanism.

[0047] In some embodiments of this application, the bearing housing 220 is further provided with an end cover 6 and a bearing spacer 7. The bearing spacer 7 is located between the two bearings 230, and the two end faces of the bearing spacer 7 are in contact with the inner ring end faces of the two bearings 230 respectively. The end cover 6 is fixedly connected to the bearing 230 near the handwheel 310.

[0048] Understandably, the bearing spacer 7, acting as a spacer between the inner rings of the two bearings 230, ensures uniform contact across the entire circumference of the inner ring end faces through its end face, eliminating uneven preload caused by manufacturing tolerances or assembly errors of the bearings 230. The rigid material and precise length of the spacer establish a physical benchmark for the axial dimensional chain, freeing the inner ring clearance or preload state of the two bearings 230 from a single dependence on the torque of the locking nut 560, achieving zero-deviation control of the clearance of the bearing 230 group. The rigid press-fit between the end cap 6 and the outer ring of the bearing 230 establishes an immovable axial positioning surface on the outer ring side, forming a bidirectional rigid constraint with the shoulder of the lead screw 1, reducing the axial movement of the bearing 230 system and mitigating the risk of sagging due to fretting of the movable plate 9. The solid structure of the spacer transforms the axial impact load borne by the bearing 230 from point contact to surface diffusion, preventing alternating stress concentration in localized areas of the rolling elements and delaying fatigue spalling of the bearing 230. The integrated structure of the end cap 6 forms a closed, anti-contamination cavity, blocking external dust and moisture from corroding the lubricating grease and maintaining the long-term cleanliness of the rolling interface. When the lead screw 1 is subjected to sudden radial off-center load (such as when the bottle body at the end of the stopper tilts), the radial support stiffness of the spacer can suppress the relative slippage of the inner ring and prevent rotational instability caused by the rolling element jamming.

[0049] The novel manual capping device structure of the freeze dryer in the above embodiments employs two sets of independent sealing mechanisms 4 facing opposite directions at the key dynamic sealing point where the lead screw 1 passes through the drying chamber, namely the support 210. The lip of the inner sealing mechanism 4 faces the drying chamber 8, and under negative pressure, it uses the pressure difference to enhance the clamping force, completely sealing the vacuum leakage channel and ensuring the stability of the vacuum required by the process. The lip of the outer sealing mechanism 4 faces away from the drying chamber 8, effectively blocking the intrusion of external dust, particles and moisture, maintaining the cleanliness of the chamber. The reverse synergistic effect of the double sealing mechanisms 4 reduces the failure risk of a single seal under bidirectional pressure difference and improves the dynamic seal between the rotating lead screw 1 and the static chamber. Two sets of bearings 230 are symmetrically arranged at the shoulder of the lead screw 1. Through the composite support structure of bearing housing 220 and support 210, the inner ring of bearing 230 is tightly attached to both sides of the shoulder, eliminating the axial movement of lead screw 1 and avoiding uneven sealing pressure caused by displacement deviation during the compression process. The bearing 230 group forms a mechanical self-locking structure, which can independently bear the entire weight of the movable plate 9 even if the transmission is interrupted unexpectedly, reducing the risk of falling and ensuring the safety of personnel and equipment. The separate structure of support 210 and bearing housing 220 not only ensures the coaxial accuracy of bearing 230 installation, but also disperses stress through rigid connection. The structure of bearing 230 built into bearing housing 220 allows radial / axial loads to be efficiently transmitted along the path from support 210 to bearing housing 220 to outer ring of bearing 230 to rolling element to lead screw 1, reducing the risk of local deformation and extending the service life of lead screw 1.

[0050] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A novel manual capping device structure for a freeze dryer, characterized in that, include: Lead screw (1); The supporting isolation mechanism (2) includes a support (210), a bearing seat (220) and a bearing (230). The support (210) and the bearing seat (220) are both sleeved on the shoulder of the lead screw (1), and the bearing seat (220) is fixedly connected to the support (210). There are two bearings (230), which are located inside the bearing seat (220) and are rotatably connected to the lead screw (1). Rotating mechanism (3), the rotating mechanism (3) includes a transmission part and a rotating part, the rotating part is sleeved on one end of the lead screw (1) and the rotating part is fixedly connected to the lead screw (1), the transmission part is located at the connection between the lead screw (1) and the rotating part, and the transmission part is fixedly connected to the lead screw (1) and the rotating part; A sealing mechanism (4) is located inside the support (210) and sleeved on the outer surface of the lead screw (1). Several sealing mechanisms (4) are provided, and several sealing mechanisms (4) are sealed to the lead screw (1), and two sealing mechanisms (4) face opposite directions. The guide mechanism (5) is fixedly connected to the lead screw (1), and the guide mechanism (5) is located at the other end of the lead screw (1).

2. The novel manual capping device structure for a freeze dryer according to claim 1, characterized in that, The sealing mechanism (4) includes a first sealing gasket (410), a first sealing groove (420), and a first sealing ring (430). The top of the first sealing gasket (410) is fixedly connected to the first sealing ring (430), and the first sealing groove (420) is equidistantly arranged on the outside of the first sealing ring (430).

3. The novel manual capping device structure for a freeze dryer according to claim 2, characterized in that, The sealing mechanism (4) further includes a spring (440), which is annularly sleeved inside the first sealing groove (420).

4. The novel manual capping device structure for a freeze dryer according to claim 3, characterized in that, The rotating part includes a handwheel (310) and a pressure plate (320). The handwheel (310) is fixedly connected to the pressure plate (320), and the pressure plate (320) is fixedly connected to the lead screw (1) through the transmission part.

5. The novel manual capping device structure for a freeze dryer according to claim 4, characterized in that, The transmission unit includes a flat key (330), which is located inside the handwheel (310) and is fixedly connected to the lead screw (1).

6. The novel manual capping device structure for a freeze dryer according to claim 5, characterized in that, The guiding mechanism (5) includes a guide ring (510), a guide rod (520), a shaft end flange (530), and a nut (560). The guide ring (510) is fixedly connected to the support (210). The guide ring (510) is sleeved on one end of the guide rod (520) and is fixedly connected to the guide rod (520). The guide rod (520) is fixedly connected to the end of the lead screw (1) away from the guiding mechanism (5) through the nut (560). The shaft end flange (530) is fixedly connected to the guide rod (520) and is located at the end of the guide rod (520) away from the guide ring (510).

7. The novel manual capping device structure for a freeze dryer according to claim 6, characterized in that, The guide mechanism (5) also includes an O-ring (550) and a nut (560), wherein the O-ring (550) is fitted at the connection between the guide ring (510) and the support (210).

8. The novel manual capping device structure for a freeze dryer according to claim 7, characterized in that, The bearing housing (220) is also provided with an end cap (6) and a bearing spacer (7). The bearing spacer (7) is located between the two bearings (230), and the two end faces of the bearing spacer (7) are in contact with the inner ring end faces of the two bearings (230) respectively. The end cap (6) is fixedly connected to the bearing (230) near the handwheel (310).

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