Hand mold seat bearing sealing structure and hand mold seat suitable for corrosive environment

Abstract

This invention relates to a hand mold holder bearing sealing structure and a hand mold holder suitable for corrosive environments. The hand mold holder bearing sealing structure includes a bearing housing, bearings, and a shaft. The bearing housing is open at one end and sealed at the other. Several bearings are arranged at the end of the shaft. The inner ring of the bearing is fixedly connected to the shaft, and the outer ring of the bearing is fixedly connected to the bearing housing. A contact boss is provided on the shaft, and the end face of the contact boss facing the bearing housing is a smooth sealing contact surface. A graphite sleeve is fitted onto the shaft. One end face of the graphite sleeve is in contact with the sealing contact surface, and the other end of the graphite sleeve is connected to the outer ring of the bearing through an elastic element. The elastic element maintains the contact between the end face of the graphite sleeve and the sealing contact surface. A flexible sealing element in the shape of a rotating body is provided between the graphite sleeve and the open end of the bearing housing. This invention has low implementation cost, is suitable for large-scale use, and can effectively avoid jamming or jamming during shaft rotation, ensuring the reliability and stability of hand mold rotation.

Description

Technical Field

[0001] This invention relates to a hand mold holder, specifically a hand mold holder bearing sealing structure and a hand mold holder suitable for corrosive environments. Background Technology

[0002] In the disposable film glove production line, the hand mold holder is a connecting device used to install the hand mold on the disposable film glove production line. The hand mold holder is installed on the transmission chain of the production line. The chain transmission mechanism drives the hand mold holder to move forward. A support guide rail is set below the chain. As the hand mold holder moves forward, it rotates on the support guide rail, which drives the hand mold to rotate forward. The hand mold first rolls in the glue pool to pick up the glue liquid, and then rotates at high speed to shake off the excess material. Finally, after molding, curing and demolding processes, the disposable film glove is made into a finished product.

[0003] Existing hand mold holders generally have a structure as disclosed in CN 208133442 U, including a connecting seat, a shaft, and a chain hanger. The shaft passes through a bearing seat and is connected to the chain hanger via a bearing. The chain hanger is used to connect to the transmission chain, and the connecting seat is used to fix and install the hand mold.

[0004] In the manufacturing process of disposable gloves, the rotation of the hand mold is a key process step, used to ensure the uniformity of the glove thickness and to achieve demolding, etc. The bearing is a key structure to ensure the reliability and stability of the rotation of the hand mold.

[0005] In the production workshops of disposable nitrile gloves and latex gloves, the presence of corrosive gases such as strong acids and alkalis, coupled with the poor sealing at both ends of the bearing seats in existing hand mold holders, allows corrosive gases to enter and corrode the bearings. Corroded bearings may become stuck or jammed, leading to problems such as uneven hand mold rotation and insufficient rotation speed, ultimately resulting in substandard gloves. Currently, the production lines for disposable nitrile gloves and latex gloves can only address these issues by promptly replacing faulty bearings. This requires significant manpower and time for troubleshooting, and the bearing replacement process necessitates line shutdowns, severely impacting production efficiency. Given the large number of hand mold holders produced by disposable glove manufacturers, the sheer number of bearings requiring replacement due to corrosion results in substantial economic losses for the companies. Summary of the Invention

[0006] The purpose of this invention is to provide a sealing structure for a hand mold holder bearing and a hand mold holder suitable for corrosive environments, so as to solve the problem that existing hand mold holder bearings are easily corroded by corrosive gases.

[0007] This invention is implemented as follows: A hand mold seat bearing sealing structure includes a bearing chamber, a bearing, and a shaft. The bearing chamber is open at one end and sealed at the other. Several bearings are arranged at the end of the shaft. The inner ring of the bearing is fixedly connected to the shaft. The shaft extends from the open end of the bearing chamber into the bearing chamber and is coaxially arranged with the bearing chamber. The bearing is located in the bearing chamber. The outer ring of the bearing is fixedly connected to the bearing chamber. A contact boss is provided on the shaft. The contact boss is located outside the bearing chamber. The end face of the contact boss facing the bearing chamber is a smooth sealing contact surface. A graphite sleeve is fitted onto the shaft. The graphite sleeve and the shaft are clearance-fitted. One end face of the graphite sleeve is in contact with the sealing contact surface. The other end of the graphite sleeve is directly or indirectly connected to the outer ring of the bearing through an elastic element. The elastic element maintains the contact between the end face of the graphite sleeve and the sealing contact surface. A flexible sealing element in the shape of a rotating body is provided between the graphite sleeve and the open end of the bearing chamber.

[0008] Furthermore, a limiting boss is provided at the inner end of the bearing housing, and the outer ring of the bearing at the innermost end abuts against the limiting boss. Several threaded holes are provided on the side wall of the bearing housing, and a tapered set screw is threaded into the threaded hole. The tapered head of the tapered set screw contacts the outer edge of the outer ring of the bearing at the outermost end. Sealant is applied at the connection between the tapered set screw and the bolt hole.

[0009] Furthermore, there are three threaded holes, which are evenly distributed around the axis of the bearing chamber.

[0010] Furthermore, a first connecting groove is provided on the outer surface of the graphite sleeve, a second connecting groove is provided on the outer surface of the bearing chamber near the opening end, a first connecting portion is provided on the inner ring of the flexible seal, and a second connecting portion is provided on the outer ring of the flexible seal. The first connecting portion is tightly fitted into the first connecting groove, and the second connecting portion is tightly fitted into the second connecting groove.

[0011] Furthermore, both the first connecting groove and the second connecting groove are arc-shaped grooves, and both the first connecting part and the second connecting part are arc-shaped protrusion structures. The overall diameter of the first connecting part and the second connecting part is smaller than the overall diameter of the first connecting groove and the second connecting groove, respectively. The diameter of the arc-shaped structure of the first connecting part and the second connecting part is not smaller than the diameter of the arc-shaped structure of the first connecting groove and the second connecting groove, respectively.

[0012] Furthermore, the flexible seal includes a sealing disc and a flange located on the outer edge of the sealing disc, the first connecting portion is located on the inner ring of the sealing disc, and the second connecting portion is located on the inner side of the flange.

[0013] Furthermore, an arc-shaped transition section is provided on the sealing disc.

[0014] Furthermore, two retaining ring grooves are provided on the shaft, and retaining rings are installed in the two retaining ring grooves respectively. The two retaining rings are located on both sides of several bearings and are used to fix the inner ring of the bearings to the shaft.

[0015] Furthermore, a spacer sleeve is provided between the outer rings of two adjacent bearings.

[0016] Furthermore, the flexible seal is made of silicone.

[0017] Furthermore, the elastic element is a helical spring, a wave washer, a leaf spring, a butterfly spring, an elastic block, or an elastic bushing.

[0018] The present invention also discloses a hand mold holder suitable for corrosive environments, including the above-mentioned hand mold holder bearing sealing structure, a chain hanger is provided on the bearing chamber, and a connecting seat is provided on the shaft.

[0019] This invention improves the bearing sealing structure of the hand mold holder. The shaft extends into the bearing chamber but does not pass through it, making only one end of the bearing chamber open. Sealing is only required at this open end, simplifying the sealing structure and reducing sealing difficulty. The shaft is mounted in the bearing chamber via a bearing. The inner ring of the bearing is fixedly connected to the shaft via a retaining ring, and the outer ring is fixedly connected to the bearing chamber via a limiting boss and a tapered set screw. This ensures that both axial and radial forces on the shaft are transmitted to the bearing chamber through the bearing, guaranteeing the stability of the shaft during rotation.

[0020] For the open end of the bearing housing, since the shaft rotates relative to the bearing housing, the graphite sleeve is pressed against the contact boss under the pressure of the elastic element. A sealing surface is formed by the contact surface of the graphite sleeve and the sealing surface of the contact boss. The graphite sleeve and the bearing housing port are sealed together by a flexible seal. When the shaft rotates, the graphite sleeve remains stationary relative to the bearing housing under the action of the elastic element and the flexible seal. Because the sealing surface is smooth, the graphite has a self-lubricating effect when the graphite sleeve rotates relative to the sealing surface, which greatly reduces the friction between the sealing surface and the graphite sleeve, reduces the resistance during rotation, and slows down the wear rate of the graphite. Under pressure, the end face of the graphite sleeve tightly abuts against the smooth sealing surface, while graphite particles fill any tiny gaps that may appear between them, ensuring the sealing performance between the end face of the graphite sleeve and the sealing surface during relative rotation.

[0021] At the same time, the flexible seal not only seals and connects with the outer surface of the graphite sleeve and the outer surface of the bearing housing, but also forms a flexible connection between the two. During use, it can deform accordingly with the graphite sleeve to maintain the sealing performance of the connection.

[0022] This invention establishes a force transmission system between the shaft and the bearing housing by fixing the inner and outer rings of the bearing. This reduces the number of ports on the bearing housing that require sealing protection. The open end forms a rotary seal structure through contact bosses, graphite sleeves, elastic elements, and flexible seals. This ensures the sealing of the bearing housing during long-term use, preventing corrosive gases from entering and corroding the bearing. This also prevents the shaft from jamming or seizing during rotation, ensuring the reliability and stability of the hand mold's rotation. Furthermore, the hand mold holder bearing sealing structure of this invention is low-cost, easy to implement, and suitable for large-scale use. Attached Figure Description

[0023] Figure 1 This is a structural diagram of the present invention.

[0024] Figure 2 This is a structural diagram of the flexible sealing element of the present invention.

[0025] Figure 3 This is a perspective view of the bearing sealing structure of the hand mold seat of the present invention.

[0026] Figure 4 This is an exploded view of the shaft, graphite sleeve, flexible connector, and bearing chamber of the present invention.

[0027] In the diagram: 1. Shaft; 2. Bearing housing; 3. Bearing; 4. Contact boss; 5. Sealing contact surface; 6. Graphite sleeve; 7. Elastic element; 8. Flexible seal; 9. Retaining ring; 10. Limiting boss; 11. Spacer sleeve; 12. Threaded hole; 13. Tapered set screw; 14. Connecting seat; 15. First connecting groove; 16. Second connecting groove; 17. Retaining ring groove; 8-1. Sealing disc; 8-2. Flanged edge; 8-3. First connecting part; 8-4. Second connecting part. Detailed Implementation

[0028] The technical solution of the present invention 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 the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1:

[0029] This embodiment is a hand mold holder bearing sealing structure to prevent the bearing 3 of the hand mold holder from being corroded by corrosive gases. The hand mold holder bearing sealing structure involves a shaft 1, a bearing chamber 2, and a bearing 3. The shaft 1 is installed in the bearing chamber 2 through the bearing 3.

[0030] First, the shaft 1 extends into the bearing chamber 2 from one end, but does not pass through the other end of the bearing chamber 2. In this way, the bearing chamber 2 can be made into a structure with one end open and the other end closed, thereby reducing the number of end faces on the bearing chamber 2 that need to be sealed. Only the open end needs to be equipped with a special sealing structure to ensure the sealing performance, which greatly reduces the sealing difficulty of the bearing chamber 2.

[0031] The bearing 3 between the shaft 1 and the bearing chamber 2 in the hand mold holder mainly bears the radial force to maintain the stability of the hand mold during rotation. The axial force acting on the bearing 3 is mainly the weight of the hand mold holder and the hand mold. Although the axial force is small, a corresponding structure is still needed to fix the outer ring of the bearing 3 to the bearing chamber 2 and the inner ring of the bearing 3 to the shaft 1. At the same time, a suitable type of bearing 3 should be selected to ensure the transmission of axial force, so that the shaft 1 can be stably installed in the bearing chamber 2, preventing the shaft 1 from being displaced or dislodged in the bearing chamber 2, enabling the hand mold holder to operate stably, and providing a basis for sealing measures at the opening end of the bearing chamber 2.

[0032] Since the relative positions of shaft 1 and bearing housing 2 are fixed, and shaft 1 and bearing housing 2 can rotate relative to each other, it is necessary to ensure the sealing between the open ends of shaft 1 and bearing housing 2 without affecting the rotation of shaft 1. The sealing measures between the open ends of shaft 1 and bearing housing 2 mainly include the contact boss 4, graphite sleeve 6, elastic element 7, and flexible seal 8 provided on shaft 1.

[0033] A contact boss 4 is mounted on the shaft 1 and located outside the opening of the bearing chamber 2. The end face of the contact boss 4 facing the bearing chamber 2 is a sealing contact surface 5, which is a smooth surface. A graphite sleeve 6 is fitted onto the shaft 1 with a clearance fit, allowing the graphite sleeve 6 to rotate relative to the shaft 1. The end face of the graphite sleeve 6 facing the contact boss 4 is flat. An elastic element 7 applies axial pressure to the graphite sleeve 6, ensuring a tight contact between the end face of the graphite sleeve 6 and the sealing contact surface 5. When the graphite sleeve 6 rotates relative to the shaft 1, the end face of the graphite sleeve 6 and the sealing contact surface 5 can slide relative to each other while maintaining a seal.

[0034] The sealing contact surface 5 is a smooth surface, which can be processed by grinding, honing, etc., to achieve a surface roughness of Ra0.4 or less. Because the sealing contact surface 5 is very smooth, and graphite has low hardness, the graphite has a self-lubricating effect when the graphite sleeve 6 rotates relative to the sealing contact surface 5. This greatly reduces the friction between the sealing contact surface 5 and the graphite sleeve 6, reduces rotational resistance, and slows down the wear rate of the graphite. Under pressure, the end face of the graphite sleeve 6 tightly abuts against the smooth sealing contact surface 5, while graphite particles fill any tiny gaps that may appear between them, ensuring a seal between the end face of the graphite sleeve 6 and the sealing contact surface 5 during relative rotation.

[0035] The elastic element 7 is located between the graphite sleeve 6 and the bearing 3. One end of the elastic element 7 is directly or indirectly connected to the outer ring of the bearing 3, and the other end is connected to the graphite sleeve 6. On the one hand, the elastic element 7 applies elastic force to the graphite sleeve 6, causing the end face of the graphite sleeve 6 to press against the sealing contact surface 5, and maintaining a tight connection between the end face of the graphite sleeve 6 and the sealing contact surface 5 even as the graphite sleeve 6 gradually wears down; on the other hand, the elastic element 7 transmits torque, causing the graphite sleeve 6, the elastic element 7, and the outer ring of the bearing 3 to rotate synchronously relative to the shaft 1.

[0036] The elastic element 7 can be directly connected to the outer ring of the bearing 3, or it can be connected to a structure that is fixedly connected to the outer ring of the bearing 3.

[0037] The elastic element 7 can be a helical spring, wave washer, leaf spring, butterfly spring, elastic block, elastic bushing, or other element or component that can provide axial elastic force to the graphite sleeve 6.

[0038] Specifically, the elastic element 7 can be a tower-shaped spring, with its small end in contact with the stepped surface on the graphite sleeve 6 and its large end in contact with the outer ring of the bearing 3.

[0039] This invention uses a flexible sealing element 8 to seal the graphite sleeve 6 and the open end of the bearing chamber 2. The flexible sealing element 8 has a rotating structure and can undergo a certain degree of elastic deformation. A first connecting groove 15 is provided on the outer surface of the graphite sleeve 6, and a second connecting groove 16 is provided on the outer surface of the bearing chamber 2 near the open end. A first connecting portion 8-3 is provided on the inner ring of the flexible sealing element 8, and a second connecting portion 8-4 is provided on the outer ring of the flexible sealing element 8. The first connecting portion 8-3 is tightly fitted into the first connecting groove 15, and the second connecting portion 8-4 is tightly fitted into the second connecting groove 16. The flexible sealing element 8 is sealed to the graphite sleeve 6 through the first connecting portion 8-3 and to the bearing chamber 2 through the second connecting portion 8-4, thereby achieving a seal between the graphite sleeve 6 and the bearing chamber 2.

[0040] In this design, both the first connecting groove 15 and the second connecting groove 16 are arc-shaped grooves, and both the first connecting part 8-3 and the second connecting part 8-4 are arc-shaped protrusions. The diameter of the annular structure of the first connecting part 8-3 and the second connecting part 8-4 is smaller than the diameter of the annular structure of the first connecting groove 15 and the second connecting groove 16, respectively. This allows the first connecting part 8-3 to fit tightly onto the first connecting groove 15, and the second connecting part 8-4 to fit tightly onto the second connecting groove 16. At the same time, the diameter of the arc-shaped structure of the first connecting part 8-3 and the second connecting part 8-4 is not smaller than the diameter of the arc-shaped structure of the first connecting groove 15 and the second connecting groove 16. The arc-shaped surface of the first connecting part 8-3 can fit tightly against the inner wall of the first connecting groove 15, and the arc-shaped surface of the second connecting part 8-4 can fit tightly against the interior of the second connecting groove 16.

[0041] When the graphite sleeve 6 wears down during use, causing the position of the first connecting groove 15 to change, the flexible seal 8 can elastically deform, ensuring a tight seal between the first connecting part 8-3, the second connecting part 8-4, and the first connecting groove 15 and the second connecting groove 16. Furthermore, since the first connecting part 8-3, the second connecting part 8-4, and the first connecting groove 15 and the second connecting groove 16 are all arc-shaped structures, when the flexible seal 8 deforms and its angle changes, the first connecting part 8-3 and the second connecting part 8-4 can adaptively rotate within the first connecting groove 15 and the second connecting groove 16, respectively, thus ensuring the sealing of the connection.

[0042] In addition, the flexible seal 8 can transmit torque, enabling the graphite sleeve 6, the flexible seal 8, and the bearing chamber 2 to rotate synchronously relative to the shaft 1.

[0043] The flexible seal 8 body specifically includes a sealing disc 8-1 and a flange 8-2 located on the outer edge of the sealing disc 8-1. The first connecting part 8-3 is located in the inner ring of the sealing disc 8-1, and the second connecting part 8-4 is located on the inner side of the flange 8-2. The first connecting part 8-3 and the second connecting part 8-4 are both located in the inner ring of the structure, so that the first connecting part 8-3 and the second connecting part 8-4 are not only subject to the shrinkage force generated by their own deformation, but also to the shrinkage force generated by the deformation of the sealing disc 8-1 and the flange 8-2, thereby ensuring that the first connecting part 8-3 tightly holds the first connecting groove 15 and the second connecting part 8-4 tightly holds the second connecting groove 16.

[0044] Specifically, the flange 8-2 is a conical structure with a diameter that gradually decreases along the axial direction. When the flange 8-2 expands and deforms outward, it can generate a large contraction force.

[0045] In addition, an arc-shaped transition section is provided on the sealing disc 8-1. The arc-shaped transition section is prone to elastic deformation, so that when the first connecting part 8-3 moves axially, it mainly undergoes elastic deformation through the arc-shaped transition section, reducing the impact on the first connecting part 8-3 and the second connecting part 8-4.

[0046] The flexible seal 8 can be made of silicone, rubber, or other materials.

[0047] In this embodiment, two bearings 3 are installed on the shaft 1. The inner ring of the bearing 3 is sleeved on the shaft 1. Two retaining ring grooves 17 are provided on the shaft 1. Retaining rings 9 are installed in the two retaining ring grooves 17 respectively. The two retaining rings 9 are located on both sides of the two bearings 3. The inner ring of the bearing 3 is fixedly connected to the shaft 1 by the two retaining rings 9.

[0048] A spacer sleeve 11 is provided between the outer rings of two adjacent bearings 3. The spacer sleeve 11 makes the distance between the two bearings 3 a certain distance, so as to improve the stability of the support of the shaft 1.

[0049] Bearing 3 can be a deep groove ball bearing or two opposing angular contact bearings or tapered roller bearings.

[0050] Since the bearing 3 is first installed on the shaft 1 during installation, and then the shaft 1 and bearing 3 are inserted into the bearing chamber 2, and the bearing 3 needs to be removable from the bearing chamber 2 for easy maintenance, this invention uses a special structure to fix the outer ring of the bearing 3. The invention has a limiting boss 10 at the inner end of the bearing chamber 2, and the outer ring of the bearing 3 at the innermost end rests against the limiting boss 10. Several threaded holes 12 are provided on the side wall of the bearing chamber 2, and tapered set screws 13 are threaded into the threaded holes 12. The tapered head of the tapered set screw 13 contacts the outer edge of the outer ring of the bearing 3 at the outermost end. During installation, the tapered head of the tapered set screw 13 is adjusted to press the outer ring of the bearing 3 against the limiting boss 10. During disassembly, the bearing 3 can be removed from the bearing chamber 2 by removing the tapered set screw 13.

[0051] To ensure the sealing of the bolt hole, sealant is applied to the connection between the tapered set screw 13 and the bolt hole. Since the connection between the tapered set screw 13 and the bolt hole remains fixed when the hand mold base is working, effective sealing can be achieved simply by applying sealant.

[0052] To ensure the stability of the connection between bearing 3 and bearing housing 2, three threaded holes 12 are opened on the side wall of bearing housing 2, and the three threaded holes 12 are evenly distributed around the axis of bearing housing 2. The outer ring of bearing 3 is fixed simultaneously by three tapered set screws 13, so that bearing 3 has good alignment and stability. Example 2:

[0053] like Figure 1 As shown, this embodiment is a hand mold holder suitable for corrosive environments. It adopts the hand mold holder bearing sealing structure in Embodiment 1. A chain hanger (not shown in the figure) is provided on the bearing chamber 2. The chain hanger is connected to the transmission chain. A connecting seat 14 is provided on the shaft 1. The connecting seat 14 is used to install the hand mold.

[0054] Since the shaft 1 no longer completely passes through the bearing chamber 2, the other end of the shaft 1 can pass through the connecting chamber and a pressure plate is set at the end of the shaft 1. A return spring is sleeved on the shaft 1. By driving the shaft 1 to move axially, the return spring is compressed, which opens the pressure plate and allows the installation of the hand mold.

[0055] Alternatively, a pressure rod can be inserted inside the shaft 1, passing through the connecting seat 14. A pressure plate is installed at the end of the pressure rod, and a return spring is sleeved on the pressure rod. The pressure plate is opened by driving the pressure rod, thereby installing the hand mold.

[0056] This invention isolates the bearing 3 between the shaft 1 and the bearing chamber 2 from external corrosive gases through a sealing structure, thus preventing corrosion of the bearing 3 and avoiding jamming or jamming during the rotation of the shaft 1. This ensures the reliability and stability of the hand mold rotation. At the same time, the hand mold seat bearing sealing structure of this invention is low in cost and easy to implement, and is suitable for large-scale use in production lines with corrosive gases in environments such as disposable nitrile gloves and latex gloves.

[0057] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hand mold seat bearing sealing structure, comprising a bearing housing, a bearing, and a shaft, characterized in that, The bearing housing is open at one end and sealed at the other. Several bearings are installed at the end of the shaft. The inner ring of each bearing is fixedly connected to the shaft. The shaft extends from the open end of the bearing housing into the bearing housing and is coaxially arranged within it. The bearings are located within the bearing housing, and their outer rings are fixedly connected to it. A contact boss is provided on the shaft, located outside the bearing housing. The end face of the contact boss facing the bearing housing is a smooth sealing contact surface. A graphite sleeve is fitted onto the shaft with a clearance fit. One end face of the graphite sleeve contacts the sealing contact surface, and the other end of the graphite sleeve is directly or indirectly connected to the outer ring of the bearing via an elastic element. The elastic element maintains contact between the end face of the graphite sleeve and the sealing contact surface. A flexible sealing element with a rotating body is provided between the graphite sleeve and the open end of the bearing housing.

2. The hand mold seat bearing sealing structure according to claim 1, characterized in that, A limiting boss is provided at the inner end of the bearing housing. The outer ring of the bearing at the innermost end abuts against the limiting boss. Several threaded holes are provided on the side wall of the bearing housing. A tapered set screw is threaded into the threaded hole. The tapered head of the tapered set screw contacts the outer edge of the outer ring of the bearing at the outermost end. Sealant is applied at the connection between the tapered set screw and the bolt hole.

3. The hand mold seat bearing sealing structure according to claim 2, characterized in that, There are three threaded holes, which are evenly distributed around the axis of the bearing housing.

4. The hand mold seat bearing sealing structure according to claim 1, characterized in that, A first connecting groove is provided on the outer surface of the graphite sleeve, and a second connecting groove is provided on the outer surface of the bearing chamber near the opening end. A first connecting part is provided on the inner ring of the flexible seal, and a second connecting part is provided on the outer ring of the flexible seal. The first connecting part is tightly fitted into the first connecting groove, and the second connecting part is tightly fitted into the second connecting groove.

5. The hand mold seat bearing sealing structure according to claim 4, characterized in that, Both the first connecting groove and the second connecting groove are arc-shaped grooves, and both the first connecting part and the second connecting part are arc-shaped protrusion structures. The overall diameter of the first connecting part and the second connecting part is smaller than the overall diameter of the first connecting groove and the second connecting groove, respectively. The diameter of the arc-shaped structure of the first connecting part and the second connecting part is not smaller than the diameter of the arc-shaped structure of the first connecting groove and the second connecting groove, respectively.

6. The hand mold seat bearing sealing structure according to claim 4, characterized in that, The flexible seal includes a sealing disc and a flange located on the outer edge of the sealing disc. The first connecting portion is located on the inner ring of the sealing disc, and the second connecting portion is located on the inner side of the flange.

7. The hand mold seat bearing sealing structure according to claim 6, characterized in that, An arc-shaped transition section is provided on the sealing disc.

8. The hand mold seat bearing sealing structure according to claim 1, characterized in that, Two retaining ring grooves are provided on the shaft, and retaining rings are installed in the two retaining ring grooves respectively. The two retaining rings are located on both sides of several bearings and are used to fix the inner ring of the bearings to the shaft.

9. The hand mold seat bearing sealing structure according to claim 1, characterized in that, A spacer sleeve is provided between the outer rings of two adjacent bearings.

10. A hand mold holder suitable for corrosive environments, characterized in that, The bearing sealing structure for the hand mold seat as described in any one of claims 1 to 9 includes a chain hanger on the bearing chamber and a connecting seat on the shaft.

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