A fourth roller head breakage prevention structure of a roving frame

Abstract

This application relates to a fracture prevention structure for the fourth roller head of a roving frame, specifically in the field of improved fourth roller head structure technology. It includes a roller body and a first bearing seat and a second bearing seat arranged axially at intervals along the head section of the roller body. This application uses a fixed support top wire and a sloped contact surface to restrict bearing seat displacement and maintain roller concentricity. The middle part of the fixed support top wire on the second bearing seat is located at the lower end of the roller body head section, and the sloped contact surface is in contact with the outer wall of the lower end of the roller body head section. When the roving frame experiences roller entanglement or other issues, and the roller body head section tends to move the bearing seat backward, the fixed support top wire tightens radially. Twisting the top wire to move it left or right changes the contact pressure between the sloped contact surface and the roller, precisely counteracting the displacement tendency. This solves the problem in the original structure where "the conventional fixing screws have insufficient fixing strength, and the bearing seat easily moves backward, causing misalignment of the roller axis and offset of the spacing."

Description

Technical Field

[0001] This application relates to the technical field of fourth roller head structure improvement of roving frames, and in particular to a fracture prevention structure for the fourth roller head of a roving frame. Background Technology

[0002] During the operation of a roving frame, the fourth roller head is a key component ensuring stable roving production. In existing roving frame fourth roller head structures, the bearing housing attached to its head section shaft is only secured with conventional fixing screws, which lack sufficient strength. When roller entanglement occurs during roving frame operation, the roller head section is subjected to external forces, causing the bearing housing to tend to shift backward. This leads to misalignment of the roller axis and displacement of the roller spacing. Over long-term operation, this displacement causes additional stress concentration on the roller head bearing, ultimately resulting in frequent roller head breakage. This not only affects the normal operation of the equipment but also adversely impacts production continuity, while increasing the frequency and difficulty of equipment maintenance. Currently, there is no effective structural improvement solution to address this problem and the inherent weakness of the roller head cannot be fundamentally resolved. Therefore, this paper proposes a fracture-resistant structure for the fourth roller head of a roving frame. Utility Model Content

[0003] The purpose of this application is to provide a fracture prevention structure for the fourth roller head of a roving frame, which has the advantages of limiting bearing housing displacement, maintaining roller axis concentricity, reducing stress concentration in the roller head section, extending the service life of the roller and bearing, and reducing equipment maintenance frequency.

[0004] This application provides a fracture prevention structure for the fourth roller head of a roving frame, employing the following technical solution: It includes a roller body, a first bearing seat and a second bearing seat arranged axially at intervals along the head section of the roller body, and original fixing screws for respectively fixing the first bearing seat and the second bearing seat. The first bearing seat is sleeved on the head section of the roller body, and a YSN41 wide-body bearing is assembled inside the first bearing seat, the YSN41 wide-body bearing cooperating with the head section of the roller body; the second bearing seat is provided corresponding to the head section of the roller body, and the second bearing seat is provided with... A fixed support set screw is provided, with its middle portion located at the lower end of the roller body head section. It radially engages and abuts against the lower end of the roller body head section to limit the displacement of the first bearing seat relative to the roller body. The middle portion of the fixed support set screw has a sloping contact surface adapted to the lower end of the roller body head section. This sloping contact surface adheres to the outer wall of the lower end of the roller body head section, forming an inclined contact abutment. The inclination angle of the sloping contact surface is adapted to the outer diameter of the roller body head section, ensuring that the contact pressure with the roller can be changed when the set screw moves left or right.

[0005] By adopting the above technical solution, the YSN41 wide-body bearing is installed in the first bearing housing, increasing the contact area between the bearing and the roller head section, making the roller head section more evenly stressed and reducing local stress concentration. The fixed support screw and the sloping contact surface on the second bearing housing are used to radially press against the roller head section. The contact pressure can be changed by adjusting the left and right positions of the set screw, which can precisely limit the displacement of the first bearing housing relative to the roller body. This solves the problem of bearing housing displacement and roller axis misalignment caused by insufficient strength of conventional fixing screws in the original structure, fundamentally reducing roller head breakage failures and ensuring stable operation of the equipment.

[0006] Preferably, the second bearing housing has a threaded hole adapted to the fixed support set screw. The fixed support set screw is threaded to the threaded hole through an external thread, and an anti-slip layer is provided at the sloping contact surface in the middle part of the fixed support set screw. The anti-slip layer is in contact with the lower outer wall of the roller body head section to avoid contact sliding and affect the clamping effect.

[0007] By adopting the above technical solution, the threaded hole of the second bearing housing provides a stable threaded connection foundation for the fixed support set screw, ensuring that the set screw is firmly assembled; the anti-slip layer at the sloping contact surface is in contact with the outer wall of the roller body head section, which can not only avoid abnormal sliding between the set screw and the roller due to the tightness, preventing the tightness effect from failing, but also not hinder the normal rotation of the roller body, balancing the "radial constraint" and "rotation requirements", and ensuring production continuity.

[0008] Preferably, the inner ring of the YSN41 wide-body bearing is interference-fitted with the head section of the roller body, and the outer ring of the YSN41 wide-body bearing is transition-fitted with the inner wall of the first bearing housing.

[0009] By adopting the above technical solution, the inner ring of the YSN41 wide-body bearing is interference-fitted with the head section of the roller body, ensuring that the inner ring of the bearing rotates synchronously with the roller, and the force transmission is more stable; the outer ring of the bearing is transition-fitted with the inner wall of the first bearing housing, which not only ensures the fixation of the outer ring of the bearing, but also avoids bearing damage caused by excessive tightness, further improving the load-bearing capacity and service life of the wide-body bearing, and reducing equipment failures caused by bearing failure.

[0010] Preferably, the axis of the fixed support top screw is perpendicular to the axis of the roller body head section to form a radial constraint, and the sloping contact surface of the middle part of the fixed support top screw is directly opposite the force center point at the lower end of the roller body head section.

[0011] By adopting the above technical solution, the fixed support top screw axis is set perpendicular to the roller body head section axis, which can form a precise radial constraint and directly resist the tendency of the bearing seat to shift backward; the sloping contact surface is directly opposite the force center point at the lower end of the roller body head section, so that the clamping force of the top screw can be concentrated on the key force point, improving the constraint efficiency, avoiding clamping failure caused by force point offset, and better maintaining the concentricity of the roller axis.

[0012] Preferably, both ends of the fixing support top screw are provided with internal hexagonal holes, so that the left and right positions of the fixing support top screw can be adjusted by screwing it from either end with a tool, thereby changing the contact position and tightness between the sloped bonding surface and the lower end of the roller body head section.

[0013] By adopting the above technical solution, the internal hexagonal holes at both ends of the fixed support top wire allow the left and right positions of the top wire to be adjusted by screwing it from either end with a tool. The contact position and tightness between the sloped bonding surface and the roller can be changed without disassembling other parts, simplifying the adjustment operation, adapting to the needs of different operating conditions of the roving frame, and reducing the difficulty and time cost of equipment maintenance.

[0014] Preferably, the original fixing screws on the first bearing seat and the fixing support screws on the second bearing seat are staggered. The original fixing screws fix the first bearing seat and the second bearing seat axially respectively. The fixing support screws form a constraint radially from the lower end of the roller body head section through the sloping contact surface in the middle part, and together with the original fixing screws on the first bearing seat, they form a two-way fixing structure.

[0015] By adopting the above technical solution, the original fixing screws of the first bearing housing and the fixing support set screws of the second bearing housing are staggered to avoid interference during installation. The original fixing screws fix the bearing housing axially, and the set screws form a constraint radially, together forming a "axial + radial" two-way fixing structure. Compared with the original single axial fixing, the overall stability of the bearing housing is greatly improved, effectively resisting the two-way external force on the head section of the roller body, and further ensuring the stability of the roller spacing.

[0016] Preferably, the wall of the threaded hole is coated with anti-loosening adhesive. After the fixing support screw is screwed into the threaded hole, it is fixed by anti-loosening adhesive to prevent the middle part from failing to abut against the lower end of the roller body head section due to loosening of the screw.

[0017] By adopting the above technical solution, the anti-loosening adhesive on the wall of the threaded hole can achieve anti-loosening fixation after the fixed support top wire is screwed in, avoiding the loosening of the top wire caused by vibration during long-term operation of the roving frame, preventing the failure of the top wire to abut against the head section of the roller body, reducing secondary failures caused by loose top wire, and reducing the frequency of equipment maintenance and spare parts consumption.

[0018] Preferably, the edge of the sloping contact surface in the middle part of the fixed support top screw is treated with a rounded transition to avoid local stress concentration when it comes into contact with the outer wall of the lower end of the roller body, while ensuring the smoothness of the roller body rotation.

[0019] By adopting the above technical solution, the rounded transition treatment of the edge of the fixed support top wire slope type bonding surface can avoid local stress concentration when the bonding surface contacts the outer wall of the roller body head end, protect the outer wall of the roller and the bonding surface of the top wire from wear, and extend the service life of both; at the same time, it reduces the frictional resistance of the edge of the bonding surface when the roller rotates, ensures the smooth rotation of the roller body, and does not affect the roving drafting efficiency.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] This invention relates to a fracture prevention structure for the fourth roller head of a roving frame. It restricts bearing seat displacement and maintains roller concentricity by using a fixed support top wire and a sloping contact surface. The middle part of the fixed support top wire on the second bearing seat is located at the lower end of the roller body head section, and the sloping contact surface is in contact with the outer wall of the lower end of the roller body head section. When the roving frame experiences roller entanglement or other issues, and the roller body head section tends to move the bearing seat backward, the fixed support top wire tightens radially. Twisting the top wire to move it left or right changes the contact pressure between the sloping contact surface and the roller, precisely counteracting the displacement tendency. This solves the problem in the original structure where "the conventional fixing screws have insufficient fixing strength, and the bearing seat easily moves backward, causing roller axis misalignment and spacing offset," and avoids additional stress on the roller body due to concentricity deviation. This design fundamentally reduces roller head breakage and ensures normal equipment operation. The YSN41 wide-body bearing achieves uniform force distribution on the roller head section, reducing stress concentration. The first bearing housing is fitted around the roller head section. The inner ring of the YSN41 wide-body bearing has an interference fit with the roller head section, while the outer ring has a transition fit with the inner wall of the first bearing housing. This provides stable rotational support for the roller body while increasing the contact area between the bearing and the roller head section. When the roller body is subjected to external force, the wide-body bearing can evenly transfer the force to the first bearing housing, avoiding localized stress concentration caused by the small force-bearing surface of conventional bearings. This solves the problems of easy bearing damage and roller head section breakage due to stress concentration in the original structure, extending the service life of the roller head and bearings, and reducing equipment failures caused by bearing damage. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this application;

[0023] Figure 2 This is a schematic diagram of the three-dimensional connection between the first bearing housing and the YSN41 wide-body bearing in this application.

[0024] Figure 3 for Figure 1 Schematic diagram of the structure at point A;

[0025] Figure 4 A schematic diagram of the structure for fixing the end face of the support screw;

[0026] Figure 5 This is a partial structural schematic diagram of the second bearing housing of this application.

[0027] In the picture:

[0028] 1. Roller body; 2. First bearing seat; 3. Second bearing seat; 4. Original fixing screw; 5. YSN41 wide-body bearing; 6. Fixing support set screw; 7. Sloping mating surface; 8. Threaded hole; 9. Anti-slip layer; 10. Socket hexagon hole; 11. Anti-loosening adhesive. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1 - Appendix Figure 5 This application will be described in further detail below.

[0030] Example 1: A breakage prevention structure for the fourth roller head of a roving frame, referring to... Figure 1 , Figure 2 and Figure 3 The system includes a roller body 1, a first bearing seat 2 and a second bearing seat 3 arranged axially at intervals along the head section of the roller body 1, and original fixing screws 4 for fixing the first bearing seat 2 and the second bearing seat 3 respectively. The first bearing seat 2 is sleeved on the head section of the roller body 1, and a YSN41 wide-body bearing 5 is assembled inside the first bearing seat 2. The YSN41 wide-body bearing 5 mates with the head section of the roller body 1. The second bearing seat 3 is provided corresponding to the head section of the roller body 1, and a fixing support screw 6 is provided on the second bearing seat 3. The middle part of the fixing support screw 6 is located at the lower end of the head section of the roller body 1 and is radially engaged and pressed against the lower end of the head section of the roller body 1 to limit the displacement of the first bearing seat 2 relative to the roller body 1. The middle part of the fixing support screw 6 is provided with a sloped contact surface 7 adapted to the lower end of the head section of the roller body 1. 7 is fitted against the lower outer wall of the roller body 1 head section, forming an inclined contact type of abutment; the inclination angle of the inclined surface 7 is adapted to the outer diameter of the roller body 1 head section, ensuring that the contact pressure with the roller can be changed when the set screw moves left and right. By assembling the YSN41 wide-body bearing 5 in the first bearing seat 2, the contact area between the bearing and the roller body 1 head section is increased, making the roller head section more evenly stressed and reducing local stress concentration; through the fixed support set screw 6 on the second bearing seat 3 and the inclined surface 7, the roller body 1 head section is radially pressed. The contact pressure can be changed by adjusting the left and right position of the set screw, which precisely limits the displacement of the first bearing seat 2 relative to the roller body 1. This solves the problem of bearing seat displacement and roller axis misalignment caused by insufficient strength of conventional fixing screws in the original structure, fundamentally reducing roller head breakage failures and ensuring stable operation of the equipment.

[0031] Reference Figure 1 , Figure 2 and Figure 3The second bearing housing 3 has a threaded hole 8 that matches the fixed support set screw 6. The fixed support set screw 6 is threadedly connected to the threaded hole 8 via an external thread. An anti-slip layer 9 is provided at the sloping contact surface 7 in the middle of the fixed support set screw 6. The anti-slip layer 9 is in contact with the lower outer wall of the roller body 1 head section to prevent contact slippage from affecting the clamping effect. The inner ring of the YSN41 wide-body bearing 5 is interference-fitted with the roller body 1 head section, and the outer ring of the YSN41 wide-body bearing 5 is transition-fitted with the inner wall of the first bearing housing 2. The threaded hole 8 of the second bearing housing 3 provides a stable threaded connection base for the fixed support set screw 6, ensuring a secure assembly of the set screw; the sloping contact surface 7... The anti-slip layer 9 is fitted to the outer wall of the head section of the roller body 1, which can not only prevent abnormal sliding between the set screw and the roller due to tightness, thus preventing the failure of the tightness effect, but also does not hinder the normal rotation of the roller body 1, balancing "radial constraint" and "rotation requirements" to ensure production continuity. The inner ring of the YSN41 wide-body bearing 5 is interference-fitted with the head section of the roller body 1 to ensure that the inner ring of the bearing rotates synchronously with the roller, making the force transmission more stable. The outer ring of the bearing is transition-fitted with the inner wall of the first bearing seat 2, which not only ensures the fixation of the outer ring of the bearing, but also avoids bearing damage caused by excessive tightness, further improving the load-bearing capacity and service life of the wide-body bearing and reducing equipment failures caused by bearing failure.

[0032] Reference Figure 1 , Figure 2 and Figure 4 The axis of the fixed support screw 6 is perpendicular to the axis of the roller body 1 head section to form a radial constraint. The sloping contact surface 7 in the middle of the fixed support screw 6 is directly opposite the force center point at the lower end of the roller body 1 head section. Both ends of the fixed support screw 6 have internal hexagonal holes 10, allowing adjustment of its position by screwing it from either end with a tool. This changes the contact position and tightness between the sloping contact surface 7 and the lower end of the roller body 1 head section. The perpendicular alignment of the axis of the fixed support screw 6 with the axis of the roller body 1 head section creates a precise radial constraint, directly resisting the bearing seat. The sloped contact surface 7 is aligned with the center of force at the lower end of the roller body 1, allowing the clamping force of the top wire to be concentrated on the key force point, improving constraint efficiency, avoiding clamping failure due to force point offset, better maintaining the concentricity of the roller axis, and fixing the internal hexagonal holes 10 at both ends of the top wire 6. The left and right positions of the top wire can be adjusted by screwing it from either end with a tool. The contact position and clamping degree between the sloped contact surface 7 and the roller can be changed without disassembling other parts, simplifying the adjustment operation, adapting to the needs of different operating conditions of the roving frame, and reducing the difficulty and time cost of equipment maintenance.

[0033] Reference Figure 1 , Figure 2 and Figure 5The original fixing screws 4 on the first bearing seat 2 and the fixing support screws 6 on the second bearing seat 3 are staggered. The original fixing screws 4 fix the first bearing seat 2 and the second bearing seat 3 axially respectively. The fixing support screws 6 form a constraint radially from the lower end of the roller body 1 head section through the sloping contact surface 7 in the middle part, forming a two-way fixing structure together with the original fixing screws 4 on the first bearing seat 2. The hole wall of the threaded hole 8 is coated with anti-loosening adhesive 11. After the fixing support screws 6 are screwed into the threaded hole 8, they are fixed by anti-loosening adhesive 11 to prevent loosening and failure of the middle part to abut against the lower end of the roller body 1 head section due to loosening of the screws. The edge of the sloping contact surface 7 in the middle part of the fixing support screws 6 is rounded to avoid local stress concentration when in contact with the outer wall of the lower end of the roller body 1 head section, and at the same time to ensure the smoothness of the roller body 1 rotation. The original fixing screws 4 on the first bearing seat 2 and the fixing support screws 6 on the second bearing seat 3 are staggered to avoid interference during installation. The fixing screw 4 fixes the bearing seat axially, and the set screw forms a constraint radially, together forming a two-way fixing structure of "axial + radial". Compared with the original single axial fixing, it greatly improves the overall stability of the bearing seat, effectively resists the two-way external force on the head section of the roller body 1, and further ensures the stability of the roller spacing. The anti-loosening adhesive 11 on the wall of the threaded hole 8 can achieve anti-loosening fixation after the fixed support set screw 6 is screwed in, avoiding the loosening of the set screw due to vibration during long-term operation of the roving frame, preventing the failure of the mating between the set screw and the head section of the roller body 1, reducing secondary failures caused by the loosening of the set screw, reducing the frequency of equipment maintenance and spare parts consumption. The rounded transition treatment of the edge of the sloping contact surface 7 of the fixed support set screw 6 can avoid local stress concentration when the contact surface comes into contact with the outer wall of the head section of the roller body 1, protect the outer wall of the roller and the contact surface of the set screw from wear, and extend the service life of both; at the same time, it reduces the frictional resistance of the edge of the contact surface when the roller rotates, ensuring the smooth rotation of the roller body 1 and not affecting the roving drafting efficiency.

[0034] In this embodiment, the fixed support top wire 6 and the inclined contact surface 7 restrict the displacement of the bearing seat and maintain the concentricity of the roller. The middle part of the fixed support top wire 6 on the second bearing seat 3 is located at the lower end of the head section of the roller body 1, and the inclined contact surface 7 is in contact with the outer wall of the lower end of the head section of the roller body 1. When the roving frame experiences situations such as roller entanglement, and the head section of the roller body 1 tends to drive the bearing seat to move backward, the fixed support top wire 6 is tightened radially. Twisting the top wire to move left and right can change the contact pressure between the inclined contact surface 7 and the roller, accurately counteracting the displacement trend. This solves the problem in the original structure that "the fixing strength of the conventional fixing screw is insufficient, and the bearing seat is prone to move backward, causing the roller axis to be misaligned and the spacing to shift." It also avoids additional stress on the roller body 1 due to concentricity deviation, fundamentally addressing the issue. To reduce roller head breakage and ensure normal equipment operation, the YSN41 wide-body bearing 5 is used to achieve uniform force distribution on the roller head section, reducing stress concentration. The roller body 1 head section is fitted onto the first bearing housing 2. The inner ring of the YSN41 wide-body bearing 5 has an interference fit with the roller body 1 head section, while the outer ring has a transition fit with the inner wall of the first bearing housing 2. This provides stable rotational support for the roller body 1 while increasing the contact area between the bearing and the roller head section. When the roller body 1 is subjected to external force, the wide-body bearing can evenly transfer the force to the first bearing housing 2, avoiding localized stress concentration caused by the small force-bearing surface of the original conventional bearing. This solves the problems of easy bearing damage and roller head section breakage due to stress concentration in the original structure, extending the service life of the roller head and bearing, and reducing equipment failures caused by bearing damage.

[0035] The implementation principle of this application embodiment is as follows: First, the first bearing seat 2 and the second bearing seat 3 are axially fixed using the original fixing screws 4, ensuring that the two bearing seats are axially spaced along the head section of the roller body 1 and that their initial positions are accurate, laying the foundation for subsequent structural fit; wherein the first bearing seat 2 is sleeved on the head section of the roller body 1, and the second bearing seat 3 is assembled at the corresponding position of the head section of the roller body 1, forming a bidirectional support frame for the head section of the roller body 1; the YSN41 wide-body bearing 5 assembled inside the first bearing seat 2 has its inner ring transition fit with the head section of the roller body 1 and its outer ring transition fit with the inner wall of the first bearing seat 2; when the roller body 1 is running, the YSN41 wide-body bearing 5 provides stable rotational support for the roller body 1, ensuring that the roller can rotate around The roller body 1 operates smoothly along its own axis and, through a larger contact area, evenly transmits the external force borne by the roller body 1 head section to the first bearing seat 2, avoiding localized stress concentration. The threaded hole 8 on the second bearing seat 3 is connected to the fixed support screw 6 via an external thread. Tightening the fixed support screw 6 positions its middle section at the lower end of the roller body 1 head section, with the sloping contact surface 7 of the middle section fitting against the outer wall of the lower end of the roller body 1 head section. Simultaneously, the axis of the fixed support screw 6 is perpendicular to the axis of the roller body 1 head section, and the sloping contact surface 7 faces the force center point at the lower end of the roller body 1 head section, ensuring that the screw can accurately form radial constraint. An anti-slip layer 9 is provided at the sloping contact surface 7 of the middle section of the fixed support screw 6 to prevent slippage. The sliding layer 9 fits tightly against the lower outer wall of the roller body 1, preventing abnormal sliding between the set screw and the roller due to relative contact, ensuring the clamping effect remains effective. Simultaneously, the anti-slip layer 9 does not obstruct the normal rotation of the roller body 1, balancing "radial constraint" and "rotational requirements." Using the internal hexagonal holes 10 at both ends of the fixed support set screw 6, the left and right positions of the fixed support set screw 6 can be adjusted by screwing the set screw from either end with a tool. Because the inclined angle of the sloped contact surface 7 is adapted to the outer diameter of the roller body 1's lower section, the contact position between the sloped contact surface 7 and the lower end of the roller body 1's lower section changes as the set screw moves left and right, thereby altering the contact pressure and achieving flexible adjustment of the clamping degree to adapt to different operating conditions. The first bearing seat 2... The original fixing screw 4 and the fixing support set screw 6 on the second bearing seat 3 are staggered. The original fixing screw 4 continuously fixes the two bearing seats axially, and the fixing support set screw 6 forms a constraint radially from the lower end of the roller body 1 head section. The two work together to form a two-way fixing structure of "axial fixing + radial constraint", which can resist the displacement tendency of the roller body 1 head section when subjected to external force and prevent the bearing seats from shifting. The hole wall of the threaded hole 8 on the second bearing seat 3 is coated with anti-loosening adhesive 11. After the fixing support set screw 6 is screwed into the threaded hole 8, the anti-loosening adhesive 11 can firmly connect the set screw and the threaded hole 8, prevent the set screw from loosening due to vibration during long-term operation of the equipment, and ensure that the fixing support set screw 6 always maintains radial tightness against the roller body 1, ensuring the long-term stability of the constraint effect.The sloping contact surface 7 at the middle of the fixed support top wire 6 has a rounded edge. When the roller body 1 rotates, the rounded edge avoids contact with the lower outer wall of the roller body 1 head section, preventing localized stress concentration. This protects the outer wall of the roller body 1 head section from wear and reduces rotational resistance, ensuring smooth operation of the roller body 1. When the roving frame experiences roller entanglement or other issues, and the bearing seat of the roller body 1 head section tends to shift backward due to external force, the fixed support top wire 6, through the sloping contact surface 7, radially presses against the lower end of the roller body 1 head section, precisely counteracting the shifting tendency and maintaining the concentricity of the roller body 1 axis and the stability of the roller spacing. Simultaneously, the YSN41 wide-body bearing 5 evenly transmits the external force, preventing the roller head section from breaking due to stress concentration, ultimately achieving an anti-breakage function.

Claims

1. A fracture prevention structure for the fourth roller head of a roving frame, comprising a roller body (1), a first bearing seat (2) and a second bearing seat (3) arranged axially at intervals along the head section of the roller body (1), and original fixing screws (4) for fixing the first bearing seat (2) and the second bearing seat (3) respectively, characterized in that: The first bearing housing (2) is sleeved on the head section of the roller body (1), and a YSN41 wide-body bearing (5) is assembled inside the first bearing housing (2). The YSN41 wide-body bearing (5) mates with the head section of the roller body (1). The second bearing housing (3) is provided corresponding to the head section of the roller body (1), and a fixing support screw (6) is provided on the second bearing housing (3). The middle part of the fixing support screw (6) is located at the lower end of the head section of the roller body (1) and is radially parallel to the roller body (1). The lower end of the head section is fitted tightly to restrict the displacement of the first bearing seat (2) relative to the roller body (1); the middle part of the fixed support set screw (6) is provided with a slope-shaped contact surface (7) adapted to the lower end of the head section of the roller body (1), the slope-shaped contact surface (7) is fitted with the outer wall of the lower end of the head section of the roller body (1) to form an inclined contact type abutment; the inclination angle of the slope-shaped contact surface (7) is adapted to the outer diameter of the head section of the roller body (1) to ensure that the contact pressure with the roller can be changed when the set screw moves left and right.

2. The anti-breakage structure for the fourth roller head of a roving frame according to claim 1, characterized in that: The second bearing seat (3) is provided with a threaded hole (8) that is compatible with the fixed support screw (6). The fixed support screw (6) is threaded to the threaded hole (8) through an external thread. The slope-shaped contact surface (7) in the middle part of the fixed support screw (6) is provided with an anti-slip layer (9). The anti-slip layer (9) is in contact with the lower end of the roller body (1) to avoid contact and sliding, which would affect the clamping effect.

3. The anti-breakage structure for the fourth roller head of a roving frame according to claim 1, characterized in that: The inner ring of the YSN41 wide-body bearing (5) is interference-fitted with the head section of the roller body (1), and the outer ring of the YSN41 wide-body bearing (5) is transition-fitted with the inner wall of the first bearing housing (2).

4. The anti-breakage structure for the fourth roller head of a roving frame according to claim 1, characterized in that: The axis of the fixed support top screw (6) is set perpendicular to the axis of the head section of the roller body (1) to form a radial constraint, and the slope-shaped contact surface (7) in the middle part of the fixed support top screw (6) is directly opposite the force center point at the lower end of the head section of the roller body (1).

5. The anti-breakage structure for the fourth roller head of a roving frame according to claim 1, characterized in that: Both ends of the fixed support screw (6) are provided with internal hexagonal holes (10) so that the left and right positions of the fixed support screw (6) can be adjusted by screwing it from either end with a tool, thereby changing the contact position and tightness between the slope-type mating surface (7) and the lower end of the roller body (1).

6. The anti-breakage structure for the fourth roller head of a roving frame according to claim 1, characterized in that: The original fixing screw (4) on the first bearing seat (2) and the fixing support screw (6) on the second bearing seat (3) are staggered. The original fixing screw (4) fixes the first bearing seat (2) and the second bearing seat (3) respectively along the axial direction. The fixing support screw (6) forms a constraint from the lower end of the roller body (1) in the radial direction through the sloping contact surface (7) in the middle part, and together with the original fixing screw (4) on the first bearing seat (2), they form a two-way fixing structure.

7. The anti-breakage structure for the fourth roller head of a roving frame according to claim 2, characterized in that: The wall of the threaded hole (8) is coated with anti-loosening adhesive (11). After the fixed support screw (6) is screwed into the threaded hole (8), it is fixed by anti-loosening adhesive (11) to prevent the screw from loosening and causing the middle part to fail to abut against the lower end of the roller body (1).

8. The anti-breakage structure for the fourth roller head of a roving frame according to claim 1, characterized in that: The edge of the sloping contact surface (7) in the middle part of the fixed support top screw (6) is rounded to avoid local stress concentration when it contacts the lower end of the roller body (1) and ensure the smoothness of the roller body (1) when it rotates.

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