Production process suitable for secondary transfer printing roller

Abstract

The invention relates to a production process suitable for a secondary transfer printing roller, the secondary transfer printing roller comprises a center shaft, an inner rubber pipe and an outer rubber pipe, and the production process comprises the following steps: S1, preparing materials; and S2, assembling. On one hand, on the basis of the polygonal blank, the multiple edges of the blank are clamped to move in the radial direction so as to expand or contract the center hole, accurate insertion of the center shaft is facilitated, contact between the center shaft and the inner wall of the inner rubber pipe during assembly can be reduced, and the inner rubber pipe can evenly wrap and adhere to the center shaft; meanwhile, after assembly is completed, redundant parts are removed by grinding the outer wall of the blank, and therefore damage to the inner rubber pipe is effectively avoided; and on the other hand, the negative pressure formed by the annular vacuum cavity drives the outer rubber pipe to keep uniform stress expansion in the circumferential direction, it is ensured that the outer rubber pipe is evenly attached to the surface of the inner rubber pipe, and therefore the assembling quality is ensured, and the product yield is effectively improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of secondary transfer roller processing, and particularly relates to a production process suitable for a secondary transfer roller. BACKGROUND

[0002] The secondary transfer roller in the imaging assembly of office automation equipment (particularly a medium and high-end color copying machine) is a very key imaging assembly of the copying machine, which functions to transfer the first-time imaging carbon powder on the transfer belt (transferred from the photosensitive drum to the transfer belt) to the paper for a second time, and then the imaging process can be completed through subsequent heating and fusion.

[0003] At present, the existing secondary transfer roller generally comprises a metal core shaft, an inner rubber tube (thick wall) and an outer rubber tube (thin wall), therefore, the traditional production method is that the metal core shaft, the inner rubber tube and the outer rubber tube are firstly processed and formed; then the adhesive is coated on the circumference of the metal core shaft, and the inner rubber tube and the metal core shaft are positioned and then the metal core shaft is inserted into the inner rubber tube by external pressure to be mutually bonded and fixed; then the adhesive is coated on the circumference of the outer rubber tube, and the outer rubber tube is manually sleeved on the outer layer of the inner rubber tube to be mutually bonded and fixed.

[0004] However, in the actual assembly process, the prior art has the following defects: 1. When the metal core shaft is assembled with the inner rubber tube, the outer wall of the metal core shaft is easy to contact the inner wall of the inner rubber tube, which not only easily causes the inner rubber tube to be deformed under stress and unable to ensure the expansion of the metal core shaft, but also easily damages the uniformity of the adhesive distribution on the surface of the metal core shaft, affecting the bonding effect; 2. Since the inner rubber tube and the outer rubber tube are both flexible and easy to deform, when the outer rubber tube is gradually sleeved on the inner rubber tube along the axial direction by manual operation, it is difficult to ensure that the thin-walled outer rubber tube is uniformly stressed, which easily causes local compression or expansion defects, resulting in low assembly precision and poor assembly quality of the inner and outer rubber tubes, and low yield; 3. Although there are inner support or outer clamp jigs on the market that can expand the inner hole of the inner and outer rubber tubes for assembly, the force formed by the inner support points or the outer clamp points is easy to damage the inner wall or surface of the rubber tube, affecting the yield of the product, and cannot meet the high-quality production requirements of the secondary transfer roller. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the deficiencies of the prior art and provide an improved production process suitable for a secondary transfer roller.

[0006] To solve the above technical problems, the present application adopts the following technical solutions: A production process suitable for a secondary transfer roller, the secondary transfer roller comprising a center shaft, an inner rubber tube and an outer rubber tube, the production process comprising the following steps: S1, preparing materials The central shaft and outer rubber tube are machined separately according to the design requirements; S2, Assembly, in particular, In step S1, a rubber strip with a polygonal cross-section is used. Based on the set length and center hole of the inner rubber tube, the length of the rubber strip is processed and the center hole is processed along the length direction to form the inner rubber tube blank. In step S2, firstly, adhesive is uniformly applied around the central shaft; simultaneously, multiple edges of the inner rubber tube blank are clamped and moved radially outward with the center line of the central hole of the inner rubber tube blank as a reference, so that the central hole expands uniformly outward; the central shaft is inserted into the central hole with the center line of the expanded central hole as a reference; the multiple edges of the inner rubber tube blank are driven to reset synchronously so that the central hole resets and shrinks and uniformly covers the central shaft from the inner wall; the excess part of the outer wall of the inner rubber tube blank is ground according to the set outer diameter of the inner rubber tube to form the inner rubber tube, and a semi-finished product is obtained at this time; Secondly, an adhesive is uniformly coated around the inner rubber tube; an annular vacuum adsorption zone matching the adhesive coating area around the inner rubber tube is formed around the outer rubber tube, causing the outer rubber tube to expand radially outward; the semi-finished product is inserted into the outer rubber tube with the center line of the vacuum adsorption zone as a reference; the adsorption force formed by the vacuum adsorption zone is removed, so that the outer rubber tube is uniformly wrapped around the semi-finished product to obtain the finished product.

[0007] According to a specific embodiment and preferred aspect of the present invention, in step S1, the cross-section of the rubber strip used is square; and / or, in step S1, the rubber strip is driven to compress along its length and held in a compressed state, a central hole is machined from one end of the compressed rubber strip to the other end, and the deformation is restored after machining. In the compressed state, the strength of the rubber strip is enhanced, and the forming path of the central hole is greatly shortened, significantly reducing the probability of deformation of the rubber strip during drilling, effectively improving the forming accuracy and efficiency of the hole.

[0008] Preferably, the hole forming device used for processing the center hole of the rubber strip includes a base, a compression component, and a drilling component. The base has a cavity inside, and the compression component has a compression end movably disposed within the cavity. A limiting area is formed between the compression end and the inner wall of the cavity, extending along the length of the rubber strip and matching its circumferential contour. The rubber strip is placed within the limiting area and circumferentially limited. The compression end compresses the rubber strip along its length. The drill bit of the drilling component extends into the limiting area and is used to drill a hole along the length of the rubber strip, using the compressed rubber strip as a reference. Through the cooperation of the base and the compression component, the rubber strip can be compressed along its length while maintaining circumferential limitation, ensuring precise compression while keeping both ends of the rubber strip aligned.

[0009] Specifically, the compression end is movably disposed within the cavity along the length of the rubber strip, and a limiting zone is formed between the compression end face of the compression end, the inner wall of one end of the base, and the side wall of the base. The compression end compresses the rubber strip with the inner wall of one end of the base as a reference; and / or, the drill bit of the drilling component is inserted into the cavity from one end of the base, and the length of the drill bit inserted into the cavity is equal to the length of the compressed rubber strip. Here, it is ensured that the drill bit penetrates the rubber strip to form a hole while avoiding the drill bit hitting the compression end.

[0010] According to another specific embodiment and preferred aspect of the invention, during the assembly of the central shaft and the inner rubber tube blank, the central hole of the inner rubber tube blank is driven to expand outward while maintaining a perfect circle. This ensures that the inner wall of the blank circumferentially and synchronously conforms to the central shaft during resetting, reducing the deviation rate.

[0011] Preferably, the clamping device used to assemble the central shaft and the inner rubber tube blank includes a clamping component with multiple clamping ends corresponding to multiple edges, and a power unit. The multiple clamping ends are arranged to form a material placement area, and the blank is placed in the material placement area along its own length direction. The power unit drives the multiple clamping ends to move towards each other to close or open and form a clamping position or an expansion position. When in the clamping position, each clamping end clamps the corresponding edge synchronously. When in the expansion position, the multiple clamping ends drive the blank to expand so that the diameter of the central hole is larger than the outer diameter of the central shaft. As the central shaft is inserted into the expanded central hole, the multiple clamping ends release the corresponding edges synchronously to cover the central shaft. Here, multiple clamping ends converge and clamp the outer wall of the rubber tube in opposite directions, and drive the rubber tube to expand during the opposite opening movement so that the diameter of the central hole is larger than the outer diameter of the central shaft. This not only facilitates the precise insertion of the central shaft, but also reduces the contact between the central shaft and the inner wall of the inner rubber tube during assembly. With the release of multiple clamping ends, the rubber tube is evenly covered on the surface of the central shaft, effectively improving the assembly quality.

[0012] Specifically, the clamping area formed by each clamping end extends along the length direction of the corresponding edge, and the length of the clamping area is greater than or equal to the length of the corresponding edge; and / or, the clamping component includes multiple clamping modules corresponding to each clamping end, wherein each clamping module includes a first clamping block, a second clamping block, and a clamping drive that drives the first clamping block and the second clamping block to move closer or further away from each other to clamp or release the corresponding edge on the rubber tube. During material placement, each set of first clamping blocks and second clamping blocks are spaced apart and form a positioning channel. Each edge of the blank is inserted into each positioning channel and abuts against the first clamping block from one side. As the multiple clamping ends converge towards the clamping position, the clamping drive drives the second clamping block to clamp the other side of the edge with the corresponding first clamping block as a reference.

[0013] According to another specific embodiment and preferred aspect of the present invention, the vacuum device used for assembling the semi-finished product and the inner rubber tube blank includes a hollow positioning cylinder and a vacuum component. The outer rubber tube is inserted into the positioning cylinder with the center line of the positioning cylinder as a reference, and is fixed to the two ends or the inner wall of the positioning cylinder from both ends respectively. A sealed annular vacuum zone is formed between the outer wall of the outer rubber tube and the inner wall of the positioning cylinder. The vacuum component is connected to the vacuum zone and forms a negative pressure. Based on the negative pressure formed by the vacuum component, the outer rubber tube expands circumferentially and keeps its own center line coincident with the center line of the positioning cylinder. The semi-finished product can be inserted into the outer rubber tube with the center line of the positioning cylinder as a reference.

[0014] Preferably, when the vacuum component generates negative pressure, the outer wall of the outer rubber tube is in contact with the inner wall of the positioning cylinder; and / or, the vacuum device further includes a heating component for heating the vacuum zone. Based on the support provided by the inner wall of the positioning cylinder, tensile deformation is avoided when the rubber tube touches the outer rubber tube during assembly.

[0015] Furthermore, in step S2, a hot melt adhesive is used, and during application, hot melt adhesive filaments are evenly applied to the circumference of the central shaft or inner rubber tube to form an adhesive filament layer; then, based on the central shaft or inner rubber tube rotating around its own centerline, the central shaft or inner rubber tube is heated to melt the adhesive filament layer and form an adhesive layer. This ensures the uniformity and thickness of the adhesive coating, providing a reliable guarantee for subsequent assembly and bonding.

[0016] Due to the implementation of the above technical solutions, the present invention has the following advantages compared with the prior art: When assembling existing metal mandrels with inner rubber tubes, the outer wall of the metal mandrel easily comes into contact with the inner wall of the inner rubber tube. This not only easily causes the inner rubber tube to deform under stress, failing to ensure proper coverage of the metal mandrel, but also easily disrupts the uniformity of the adhesive distribution on the surface of the metal mandrel, affecting the bonding effect. Since both the inner and outer rubber tubes are flexible and easily deformed, it is difficult to ensure uniform stress on the thin-walled outer rubber tube when manually fitting the outer rubber tube axially onto the inner rubber tube. This easily leads to defects such as localized compression or expansion, resulting in low assembly accuracy of the inner and outer rubber tubes. Poor assembly quality and low yield rate; although there are internal support or external clamping fixtures on the market that can open the inner holes of the inner and outer rubber tubes for assembly, the forces generated at the internal support points or external clamping points can easily damage the inner wall or surface of the rubber tube, affecting the product yield rate and failing to meet the high-quality production requirements of secondary transfer rollers; however, this application provides a comprehensive design for the production process applicable to secondary transfer rollers, cleverly solving the shortcomings and defects of the existing technology. After adopting this production process, during material preparation, the central shaft and outer rubber tube are machined separately according to the design requirements, using a polygonal cross-section. A rubber strip is machined to the specified length and center hole of the inner rubber tube to form an inner rubber tube blank. During assembly, firstly, adhesive is uniformly applied circumferentially to the central shaft. Simultaneously, multiple edges of the inner rubber tube blank are clamped, and the blank is moved radially outwards using the center line of the center hole as a reference, causing the center hole to expand uniformly outwards. Using the center line of the expanded center hole as a reference, the central shaft is inserted into the center hole. The multiple edges of the inner rubber tube blank are then driven to synchronously reset, causing the center hole to retract and revert to its original position. The inner wall is uniformly covered on the central axis; the outer wall of the inner rubber tube blank is ground according to the set outer diameter of the inner rubber tube to form the inner rubber tube, at which point a semi-finished product is obtained; next, adhesive is uniformly coated on the circumference of the inner rubber tube; an annular vacuum adsorption zone matching the adhesive coating area on the circumference of the inner rubber tube is formed on the outer rubber tube, so that the outer rubber tube expands outward along the radial direction; with the center line of the vacuum adsorption zone as a reference, the semi-finished product is inserted into the outer rubber tube; the adsorption force formed by the vacuum adsorption zone is removed, so that the outer rubber tube is uniformly covered on the semi-finished product to obtain the finished product. Therefore, compared with the prior art, the present invention, on the one hand, is based on a polygonal blank, and expands or contracts the central hole by clamping multiple edges of the blank and moving them radially. This not only facilitates the precise insertion of the central shaft, but also reduces the contact between the central shaft and the inner wall of the inner rubber tube during assembly, achieving uniform coverage and adhesion of the inner rubber tube to the central shaft. At the same time, after assembly, the excess part is removed by grinding the outer wall of the blank, thereby effectively avoiding damage to the inner rubber tube. On the other hand, the negative pressure formed by the annular vacuum cavity drives the outer rubber tube to maintain uniform circumferential expansion, ensuring that the outer rubber tube is uniformly attached to the surface of the inner rubber tube, thereby ensuring assembly quality and effectively improving the product yield. Attached Figure Description

[0017] Figure 1This is a half-sectional schematic diagram of the secondary transfer roller of the present invention; Figure 2 This is a flowchart illustrating the production process of the secondary transfer roller applicable to this invention; Figure 3 This is a front view schematic diagram of the hole forming device of the present invention (before compression); Figure 4 This is a front view schematic diagram (compressed) of the hole forming device of the present invention; Figure 5 This is a top view schematic diagram of the clamping device of the present invention; Figure 6 for Figure 5 A schematic diagram showing the clamping component in the clamping position; Figure 7 for Figure 5 A schematic diagram showing the clamping component in the expanded position; Figure 8 This is a half-sectional schematic diagram of the vacuum device of the present invention (including the outer rubber tube). Figure 9 for Figure 8 Schematic diagram of the assembly status of Chinese and foreign rubber hoses and semi-finished products; Among them: ① Hole forming device; 1. Base; 10. Seat bottom plate; 11. Seat end plate; 12. Seat side plate; 13. Seat top plate; q0. Cavity; 2. Compression component; 20. Cylinder; 21. Controller; d. Compression end; q1. Limiting area; 3. Drilling component; 30. Drill bit; ② Clamping device; 4. Clamping component; 40. Clamping module; 401. First clamping block; 402. Second clamping block; t. Positioning channel; s. Pivot; 403. Clamping drive; q2. Material placement area; 5. Power unit; 50. Cylinder; ③ Vacuum device; 6. Positioning cylinder; q3. Vacuum zone; 7. Vacuum components; k. Negative pressure adsorption hole; 8. Heating components; G, Secondary transfer roller; G0, Central shaft; G1, Inner rubber tube; G10, Inner rubber tube blank; G2, Outer rubber tube; b1, Crimping part; b2, Bending part. Detailed Implementation

[0018] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0019] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "length direction", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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, and therefore should not be construed as a limitation of this application.

[0020] Furthermore, 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0021] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] In this application, unless otherwise expressly specified and limited, "above" or "below" a second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of a second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" a second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intermediate element present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element present. The terms "vertical," "horizontal," "above," "below," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible embodiments.

[0023] like Figures 1 to 9 As shown, the production equipment used in the production process of the secondary transfer roller in this embodiment includes a hole forming device ①, a clamping device ②, and a vacuum device ③.

[0024] Specifically, the secondary transfer roller G in this embodiment includes a central shaft G0, an inner rubber tube G1, and an outer rubber tube G2, wherein the central shaft G0 is a metal shaft, the inner rubber tube G1 is polyurethane conductive foamed rubber, and the outer rubber tube G2 is NBR conductive rubber.

[0025] In this example, the hole forming device ① includes a base 1, a compression component 2, and a drilling component 3.

[0026] Specifically, the base 1 includes a base plate 10, two end plates 11 spaced side-by-side along the length of the rubber strip on the base plate 1, side plates 12 correspondingly connected between the opposite sides of the two end plates 11, and a top plate 13 that covers the top of the end plates 11 and the side plates 12 and is detachable and installable. The base plate 10, end plates 11, side plates 12, and top plate 13 form a cavity q0. In this embodiment, the cross-section of the rubber strip is rectangular; therefore, the cross-section of the cavity q0 is also rectangular and matches the rubber strip. Furthermore, the length of the cavity q0 is greater than the length of the rubber strip in its natural state.

[0027] In this example, the compression component 2 has a compression end d movably disposed in the cavity q. A limiting area q1 is formed between the compression end d and the inner wall of the cavity q0, extending along the length direction of the rubber strip and matching the circumferential contour of the rubber strip. The rubber strip is placed in the limiting area q1 and is limited in the circumferential direction. The compression end d is used to compress the rubber strip in the length direction.

[0028] In some specific embodiments, the compression end d is movably disposed within the cavity q0 along the length direction of the rubber strip; and a limiting area q1 is formed between the compression end face of the compression end d, the inner wall of one end of the base 1, and the side wall of the base 1. The compression end d compresses the rubber strip with the inner wall of one end of the base as a reference; in the orthographic projection along the length direction of the rubber strip, the rubber strip, the compression end face of the compression end d, and the inner wall surface of one end of the base 1 coincide. The compression component 2 includes a cylinder 20 and a controller 21, wherein the telescopic shaft of the cylinder 20 is inserted into the cavity q0 from one end of the base 1 and connected to the compression end d, wherein the telescopic shaft of the cylinder 20 extends along the length direction of the rubber strip, and the axis of the telescopic shaft of the cylinder 20 coincides with the center line of the compression end d. The controller 21 is a foot pedal controller for controlling the extension and retraction of the cylinder 20.

[0029] In this example, the drill bit 30 of the drilling component 3 extends into the limiting area q1 and is used to drill a hole along the length of the rubber strip, using the compressed rubber strip as a reference. The rubber strip after drilling is the inner rubber tube blank. That is to say, after the rubber strip is compressed, its overall strength is improved and its resistance to deformation is enhanced. Moreover, combined with the compression of the rubber strip in the circumferential limiting, the deformation generated during the drilling process can be further reduced to ensure the forming accuracy of the hole.

[0030] In some specific embodiments, the drilling component 3 uses any conventional drilling equipment, and the drill bit 30 is also a conventional drill bit suitable for drilling rubber strips. During drilling, the drill bit 30 of the drilling component 3 is inserted into the cavity q0 (or the limiting area q1) from one end of the base 1, and the length of the drill bit inserted into the cavity q0 is equal to the length of the compressed rubber strip. Here, it is ensured that the drill bit penetrates the rubber strip to form a hole while avoiding the drill bit hitting the compressed end.

[0031] In this embodiment, the center lines of the drill bit 30, the compression end d, the telescopic shaft, and the rubber strip coincide.

[0032] In this example, the clamping device ② includes a clamping component 4 and a power unit 5.

[0033] Specifically, the clamping component 4 has multiple clamping ends, which together form a material placement area q2. The inner rubber tube blank is placed in the material placement area q2 along its own length. The power unit 5 drives the multiple clamping ends to move towards each other to close or open and form a clamping position or an expansion position. When in the clamping position, each clamping end clamps the side wall of the rubber tube G synchronously. When in the expansion position, the multiple clamping ends drive the inner rubber tube blank to expand and make the diameter of the central hole larger than the outer diameter of the central shaft G0. As the central shaft G0 is inserted into the expanded central hole G0, the multiple clamping ends release the rubber tube G synchronously to cover the central shaft G0.

[0034] In this embodiment, the clamping component 4 includes four clamping modules 40 that respectively form clamping ends, wherein the four clamping ends correspond one-to-one with the four edges extending along the length direction on the inner rubber tube blank.

[0035] In some specific embodiments, each clamping module 40 includes a first clamping block 401, a second clamping block 402, and a clamping drive 403 that drives the first clamping block 401 and the second clamping block 402 to move closer or further apart to clamp or release corresponding edges on the rubber tube.

[0036] During material placement, the first clamping blocks 401 and second clamping blocks 402 in each group are spaced apart and form positioning channels t. The four edges of the inner rubber tube blank are inserted into the corresponding positioning channels t, and each edge of the inner rubber tube blank abuts against the corresponding first clamping block 401 from one side. As the multiple clamping ends converge towards the clamping position, the clamping drive 403 drives the second clamping block 402 to clamp the other side of the edge with the corresponding first clamping block 401 as a reference. This reduces the probability of the rubber tube contracting inward under force during clamping, ensuring a high success rate of clamping.

[0037] In some specific embodiments, the second clamping block 402 is rotatably connected to one side of the first clamping block 401 via a pivot s. The clamping drive 403 drives the second clamping block 402 to rotate around the center line of the pivot s, wherein the pivot s extends along the length direction of the inner rubber tube blank. Here, based on the rotational movement of the second clamping block, the end of the second clamping block contacts the side wall of the rubber tube and forms an outward force to ensure that the edge of the rubber tube is always kept between the first and second clamping blocks, thereby further improving the clamping success rate. The clamping drive 403 uses a cylinder and is controlled by a foot pedal controller, which is a conventional technical means. For ease of explanation, the clamping drive 403 has been simplified in the drawings, but it does not affect the implementation of the solution of this application.

[0038] Simultaneously, the clamping areas formed by each clamping end extend along the length direction of the corresponding edge, and the length of the clamping area is greater than or equal to the length of the corresponding edge. Here, it is ensured that the rubber tube expands uniformly to complete the insertion of the central shaft while maintaining a uniform distribution of the central hole diameter after expansion.

[0039] In addition, the power unit 5 includes four cylinders 50, which drive each first clamping block 401 to reciprocate along the diagonal direction of the corresponding edge.

[0040] In this example, the vacuum device ③ includes a positioning cylinder 6, a vacuum component 7, and a heating component 8.

[0041] Specifically, the positioning cylinder 6 is a hollow cylindrical body. In this embodiment, the positioning cylinder 6 is made of aluminum tube to ensure that the inner wall is smooth. The outer rubber tube G2 is inserted into the positioning cylinder 6 with the center line of the positioning cylinder 6 as the reference, and is fixed to the two ends or the inner wall of the positioning cylinder 6 from both ends respectively. A sealed annular vacuum area q3 is formed between the outer wall of the outer rubber tube G2 and the inner wall of the positioning cylinder 6.

[0042] For ease of implementation, the length of the positioning cylinder 6 is less than the length of the outer rubber tube. When the outer rubber tube G2 is inserted into the positioning cylinder 6, the two ends of the outer rubber tube G2 protrude from the positioning cylinder 6 by an equal length, and the two ends of the outer rubber tube G2 are respectively fixed to the two ends of the positioning cylinder 6. This not only facilitates operation, but also ensures that the two ends of the outer rubber tube do not shift during expansion, thereby ensuring that the outer rubber tube smoothly covers the circumference of the semi-finished product.

[0043] In some specific embodiments, during fixing, the two ends of the outer rubber tube G2 protrude from the two ends of the positioning cylinder 6 and are turned outward to form annular clamping parts b1 that are fixed relative to the two ends of the positioning cylinder 6. At the same time, each clamping part b1 is bent from the outer edge along the axial direction of the positioning cylinder 6 to form a bent part b2 that fits against the outer wall of the positioning cylinder 6.

[0044] In this example, the vacuum component 7 is connected to the vacuum zone q3 and forms a negative pressure. Based on the negative pressure formed by the vacuum component 7, the outer rubber tube G2 expands and keeps its centerline aligned with the centerline of the positioning cylinder 6. The outer wall of the outer rubber tube G2 is in contact with the inner wall of the positioning cylinder 6. At this time, the semi-finished product can be inserted into the outer rubber tube G2 with the centerline of the positioning cylinder 6 as the reference.

[0045] In some embodiments, the vacuum component 7 employs multiple suction motors; these motors, through suction pipes, form multiple negative pressure adsorption holes k communicating with the vacuum zone on the inner wall of the positioning cylinder 6, and these holes k are arranged side-by-side at intervals along the axial direction of the positioning cylinder 6. This ensures uniform negative pressure distribution within the vacuum zone, allowing for the uniform adsorption of the outer rubber tube. In other embodiments, the multiple negative pressure adsorption holes k can also form an adsorption hole group, with multiple holes evenly spaced around the centerline of the positioning cylinder 6.

[0046] In addition, the heating component 8 in this embodiment is used to heat the vacuum zone q3. The heating component can be any conventional heater and can directly heat the metal positioning cylinder 6 to increase the temperature of the vacuum zone q3, thereby ensuring that the air in the vacuum zone is completely removed and that the outer rubber tube G2 is completely fitted with the inner wall of the positioning cylinder 6.

[0047] Therefore, the production process applicable to secondary transfer rollers in this embodiment includes the following steps: S1. Material preparation According to the design requirements, the central shaft G0 and the outer rubber tube G2 are machined separately; a rubber strip with a square cross-section is used. According to the set length and center hole of the inner rubber tube G1, the length of the rubber strip is machined and the center hole is machined along the length direction to form the inner rubber tube blank G10.

[0048] In some specific embodiments, the rubber strip is compressed along its length and held in a compressed state. A central hole is machined from one end of the compressed rubber strip to the other, and the strip recovers its deformation after machining. In the compressed state, the strength of the rubber strip is enhanced, and the forming path of the central hole is greatly shortened, significantly reducing the probability of deformation of the rubber strip during drilling and effectively improving the forming accuracy and efficiency of the hole.

[0049] S2, Assembly First, adhesive is uniformly applied around the circumference of the central shaft G0; multiple edges of the inner rubber tube blank G10 are simultaneously clamped and moved radially outward with the center line of the center hole of the inner rubber tube blank G10 as a reference, so that the center hole is uniformly expanded outward while maintaining a perfect circle; the central shaft G0 is inserted into the center hole with the center line of the center hole of the expanded inner rubber tube blank G10 as a reference; the four edges of the inner rubber tube blank G10 are driven to reset synchronously so that the center hole resets and shrinks and uniformly covers the central shaft G0 from the inner wall; according to the set outer diameter of the inner rubber tube, the excess part of the outer wall of the inner rubber tube blank G10 is ground with a grinding wheel to form the inner rubber tube G1, at which point a semi-finished product is obtained; Secondly, adhesive is uniformly coated around the inner rubber tube G1. Because the outer rubber tube G2 is thin-walled, it is suitable for one-time processing. An annular vacuum adsorption zone is formed around the outer rubber tube G2 to match the adhesive coating area around the inner rubber tube G1, allowing the outer rubber tube G2 to expand radially outward (achieving clamp-free expansion). Using the center line of the vacuum adsorption zone as a reference, the semi-finished product is inserted into the outer rubber tube G2. The adsorption force formed by the vacuum adsorption zone is removed, allowing the outer rubber tube G2 to uniformly cover the semi-finished product to obtain the finished product. At the same time, if necessary, a grinding wheel is used to further grind the outer wall of the outer rubber tube G2 in the finished product and spray an anti-fouling and wear-resistant coating.

[0050] Furthermore, to facilitate implementation, a hot melt adhesive is used. During application, hot melt adhesive filaments are evenly applied to the circumference of the central shaft or inner rubber tube to form an adhesive filament layer. Then, the central shaft or inner rubber tube is rotated around its own centerline, and heated to melt the adhesive filament layer and form an adhesive layer. This ensures the uniformity and thickness of the adhesive coating, providing a reliable guarantee for subsequent assembly and bonding.

[0051] In summary, after adopting this production process, during material preparation, the central shaft and outer rubber tube are machined separately according to design requirements. A polygonal rubber strip is used, and the length of the rubber strip is machined according to the set length and central hole of the inner rubber tube, with the central hole machined along the length direction to form the inner rubber tube blank. During assembly, firstly, adhesive is uniformly coated around the central shaft; simultaneously, multiple edges around the circumference of the inner rubber tube blank are clamped, and the blank is moved radially outwards using the centerline of the central hole as a reference, causing the central hole to expand uniformly outwards; using the centerline of the expanded central hole as a reference, the central shaft is inserted into the central hole; and the inner rubber tube is then driven... Multiple edges of the blank are simultaneously reset so that the central hole retracts and uniformly covers the central shaft from the inner wall; the outer wall of the inner rubber tube blank is ground according to the set outer diameter of the inner rubber tube to form the inner rubber tube, at which point a semi-finished product is obtained; next, adhesive is uniformly coated around the inner rubber tube; an annular vacuum adsorption zone matching the adhesive coating area around the inner rubber tube is formed around the outer rubber tube, so that the outer rubber tube expands outward along the radial direction; the semi-finished product is inserted into the outer rubber tube with the center line of the vacuum adsorption zone as a reference; the adsorption force formed by the vacuum adsorption zone is removed, so that the outer rubber tube is uniformly covered on the semi-finished product to obtain the finished product. Therefore, compared with the prior art, this invention, on the one hand, is based on a polygonal blank. By clamping the multiple edges of the blank and moving them radially to expand or contract the central hole, it not only facilitates the precise insertion of the central shaft but also reduces the contact between the central shaft and the inner wall of the inner rubber tube during assembly, achieving uniform coverage and adhesion of the inner rubber tube to the central shaft. Simultaneously, after assembly, the excess portion is removed by grinding the outer wall of the blank, effectively preventing damage to the inner rubber tube. On the other hand, the negative pressure generated by the annular vacuum cavity drives the outer rubber tube to maintain uniform circumferential expansion, ensuring a uniform fit of the outer rubber tube. The inner rubber tube surface ensures assembly quality and effectively improves product yield. Thirdly, after compression, the overall strength of the rubber strip is improved, and its resistance to deformation is enhanced. Moreover, combined with the compression of the rubber strip in the circumferential limiting direction in the length direction, the deformation generated during the drilling process can be further reduced to ensure the forming accuracy of the hole. Fourthly, based on the rotational movement of the second clamping block, the end of the second clamping block contacts the side wall of the rubber tube and forms an outward force to ensure that the edge of the rubber tube is always kept between the first and second clamping blocks, thereby further improving the clamping success rate.

[0052] The present invention has been described in detail above, with the aim of enabling those skilled in the art to understand and implement the invention. However, this description should not be construed as limiting the scope of protection of the invention. All equivalent changes or modifications made in accordance with the spirit and essence of the invention should be included within the scope of protection of the invention.

Claims

1. A manufacturing process for a secondary transfer roller, the secondary transfer roller comprising a central shaft, an inner rubber tube, and an outer rubber tube, the manufacturing process comprising the following steps: S1. Material preparation The central shaft and outer rubber tube are machined separately according to the design requirements; S2, Assembly, Its features are, In step S1, a rubber strip with a polygonal cross-section is used. Based on the set length and center hole of the inner rubber tube, the length of the rubber strip is processed and the center hole is processed along the length direction to form the inner rubber tube blank. In step S2, firstly, adhesive is uniformly applied around the central shaft; simultaneously, multiple edges of the inner rubber tube blank are clamped and moved radially outward with the center line of the central hole of the inner rubber tube blank as a reference, so that the central hole expands uniformly outward; the central shaft is inserted into the central hole with the center line of the expanded central hole as a reference; the multiple edges of the inner rubber tube blank are driven to reset synchronously so that the central hole resets and shrinks and uniformly covers the central shaft from the inner wall; the excess part of the outer wall of the inner rubber tube blank is ground according to the set outer diameter of the inner rubber tube to form the inner rubber tube, and a semi-finished product is obtained at this time; Secondly, an adhesive is uniformly coated around the inner rubber tube; an annular vacuum adsorption zone matching the adhesive coating area around the inner rubber tube is formed around the outer rubber tube, causing the outer rubber tube to expand radially outward; the semi-finished product is inserted into the outer rubber tube with the center line of the vacuum adsorption zone as a reference; the adsorption force formed by the vacuum adsorption zone is removed, so that the outer rubber tube is uniformly wrapped around the semi-finished product to obtain the finished product.

2. The production process for secondary transfer rollers according to claim 1, characterized in that, In step S1, the cross-section of the rubber strip used is square; and / or, in step S1, the rubber strip is driven to compress along its length and held in a compressed state, a center hole is machined from one end of the compressed rubber strip to the other end, and the deformation is restored after machining.

3. The production process for secondary transfer rollers according to claim 1 or 2, characterized in that, The hole forming device used for processing the center hole of the rubber strip includes a base, a compression component, and a drilling component. The base has a cavity inside. The compression component has a compression end movably disposed in the cavity. A limiting area is formed between the compression end and the inner wall of the cavity, extending along the length direction of the rubber strip and matching the circumferential contour of the rubber strip. The rubber strip is placed in the limiting area and is circumferentially limited. The compression end is used to compress the rubber strip in the length direction. The drill bit of the drilling component extends into the limiting area and is used to drill a hole along the length direction of the rubber strip with the compressed rubber strip as a reference.

4. The production process for secondary transfer rollers according to claim 3, characterized in that, The compression end is movably disposed in the cavity along the length of the rubber strip, and the limiting area is formed between the compression end face of the compression end, the inner wall of one end of the base, and the side wall of the base. The compression end compresses the rubber strip with the inner wall of one end of the base as a reference. And / or, the drill bit of the drilling component is inserted into the cavity from one end of the base, and the length of the drill bit inserted into the cavity is equal to the length of the compressed rubber strip.

5. The production process for secondary transfer rollers according to claim 1, characterized in that, When assembling the central shaft and the inner rubber tube blank, the central hole of the inner rubber tube blank is driven to expand outward while maintaining a perfect circle.

6. The production process for secondary transfer rollers according to claim 1 or 5, characterized in that, The clamping device used to assemble the central shaft and the inner rubber tube blank includes a clamping component with multiple clamping ends corresponding to the multiple edges, and a power unit. The multiple clamping ends are arranged to form a material placement area, and the blank is placed in the material placement area along its own length. The power unit drives the multiple clamping ends to move towards each other to close or open and form a clamping position or an expansion position. When in the clamping position, each clamping end synchronously clamps the corresponding edge. When in the expansion position, the multiple clamping ends synchronously drive the blank to expand so that the diameter of the central hole is larger than the outer diameter of the central shaft. As the central shaft is inserted into the expanded central hole, the multiple clamping ends synchronously release the corresponding edge to cover the central shaft.

7. The production process for secondary transfer rollers according to claim 6, characterized in that, The clamping area formed by each clamping end extends along the length direction of the corresponding edge, and the length of the clamping area is greater than or equal to the length of the corresponding edge; and / or, the clamping component includes a plurality of clamping modules corresponding to each clamping end, wherein each clamping module includes a first clamping block, a second clamping block, and a clamping drive for driving the first clamping block and the second clamping block to move closer or further away from each other to clamp or release the corresponding edge on the rubber tube. During material placement, each set of the first clamping block and the second clamping block are spaced apart and form a positioning channel. Each edge of the blank is inserted into each positioning channel and abuts against the first clamping block from one side. As the plurality of clamping ends converge toward the clamping position, the clamping drive drives the second clamping block to clamp the other side of the edge with the corresponding first clamping block as a reference.

8. The production process for secondary transfer rollers according to claim 1, characterized in that, The vacuum device used for assembling the semi-finished product and the inner rubber tube blank includes a hollow positioning cylinder and a vacuum component. The outer rubber tube is inserted into the positioning cylinder with the center line as the reference, and is fixed from both ends to the two ends or the inner wall of the positioning cylinder. A sealed annular vacuum zone is formed between the outer wall of the outer rubber tube and the inner wall of the positioning cylinder. The vacuum component is connected to the vacuum zone and forms a negative pressure. Based on the negative pressure formed by the vacuum component, the outer rubber tube expands circumferentially and keeps its center line coincident with the center line of the positioning cylinder. The semi-finished product can be inserted into the outer rubber tube with the center line of the positioning cylinder as the reference.

9. The production process for secondary transfer rollers according to claim 8, characterized in that, When the vacuum component generates negative pressure, the outer wall of the outer rubber tube is in contact with the inner wall of the positioning cylinder; and / or, the vacuum device further includes a heating component for heating the vacuum zone.

10. The production process for secondary transfer rollers according to claim 1, characterized in that, In step S2, the adhesive is a hot melt adhesive, and during coating, the hot melt adhesive filaments are evenly covered around the central shaft or inner rubber tube to form an adhesive filament layer; then, based on the central shaft or inner rubber tube rotating around its own center line, the central shaft or inner rubber tube is heated so that the adhesive filament layer melts to form an adhesive layer.

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