An endless jointless toothed transmission steel cord conveyor belt and its production process

Abstract

The present invention relates to an annular jointless toothed transmission steel wire rope core conveyor belt and a production process, and relates to the field of annular conveyor belts, wherein the conveyor belt comprises an upper rubber layer, an upper core rubber layer, an intermediate skeleton layer, a lower core rubber layer and a lower rubber layer, wherein the upper core rubber layer and the lower core rubber layer are respectively coated on both sides of the intermediate skeleton layer, the upper rubber layer and the lower rubber layer are respectively covered on both sides of the upper core rubber layer and the lower core rubber layer, the intermediate skeleton layer is formed by winding a steel wire rope, and finally the various layers of the structure are vulcanized together through a vulcanization process to form an annular conveyor belt. The intermediate skeleton layer in the present invention is made by winding a whole steel wire rope, so that the tensile capacity of each part of the intermediate skeleton layer is relatively consistent, reducing the probability of the steel wire rope breaking due to stress concentration when the intermediate skeleton layer is subjected to load, and improving the strength of the steel wire rope core conveyor belt.

Description

Technical Field

[0001] The invention relates to the field of annular conveyor belts, in particular to an annular jointless toothed transmission steel wire rope core conveyor belt and a production process. Background Art

[0002] The endless conveyor belt is a flat conveyor belt that is produced and then vulcanized (also known as hot bonding) to transform the parallel conveyor belt into an endless conveyor belt. Adding a steel wire rope core to the endless conveyor belt can utilize the high strength and toughness of the steel wire rope to improve the load-bearing capacity of the endless conveyor belt, allowing it to withstand heavier materials.

[0003] At present, a Chinese patent application with publication number CN103692734A and publication date April 2, 2014 proposes a jointless endless conveyor belt, including an annular upper covering rubber layer, a lower covering rubber layer and an intermediate skeleton layer, the upper covering rubber layer, the lower covering rubber layer and the intermediate skeleton layer are vulcanized into one, and the intermediate skeleton layer is a wire rope or a steel wire rope spirally wound on the lower covering rubber layer.

[0004] During production, there are only pre-vulcanized raw rubber joints when the upper covering rubber layer and the lower covering rubber layer are formed, and there is no joint in the middle skeleton layer. Moreover, the joints of the upper covering rubber layer and the lower covering rubber layer are cross-linked into one through chemical reaction during vulcanization heating and cross-linking, so that the overall endless conveyor belt has no joints.

[0005] With respect to the above-mentioned related technologies, a middle skeleton layer is formed by winding a wire rope or a steel wire, but the middle skeleton layer is only fixed by winding it on the lower covering rubber layer, which causes the middle skeleton layer to be easily separated from the upper covering layer and the lower covering layer on the connecting surface after being subjected to force, and cannot play an effective force-bearing effect. Summary of the invention

[0006] In order to improve the load-bearing capacity of an annular steel cord conveyor belt, the present invention provides an annular jointless toothed transmission steel cord conveyor belt and a production process.

[0007] In the first aspect, the present invention provides an endless jointless toothed transmission steel cord conveyor belt, which adopts the following technical solution: An annular jointless toothed transmission steel cord conveyor belt comprises an upper rubber layer, a lower rubber layer and an intermediate skeleton layer, wherein the upper rubber layer and the lower rubber layer are respectively arranged on both sides of the intermediate skeleton layer. The intermediate skeleton layer is made of a steel wire rope core wound in a direction consistent with the length direction of the conveyor belt. The two ends of the steel wire rope core are respectively provided with a starting joint and an ending joint. The starting joint and the ending joint are respectively welded to the steel wire rope core at adjacent positions through a plurality of welding blocks, and the plurality of welding blocks are arranged at intervals. An upper core rubber layer is arranged between the middle skeleton layer and the upper covering rubber layer, a lower core rubber layer is arranged between the middle skeleton layer and the lower covering rubber layer, and the upper covering rubber layer, the upper core rubber layer, the middle skeleton layer, the lower core rubber layer and the lower covering rubber layer are fixedly arranged as a whole.

[0008] When the steel rope core conveyor belt fixes the internal steel rope core by welding, after the steel rope is welded, the stress will be concentrated on the welding part of the steel rope when the steel rope is subjected to force. The high temperature generated during the welding process will cause the properties of the steel rope to change, so that the strength of the welding part is reduced, and then the overall strength of the steel rope core conveyor belt is reduced. By adopting the above technical solution, the steel rope core is wound to form an intermediate skeleton. When the steel rope is subjected to force, the tension will be transmitted along the direction of the steel rope. At the same time, since the steel rope core is a whole steel rope, the intermediate skeleton layer is formed by winding, which reduces the defect that the stress will be concentrated on the welding part after the steel rope is subjected to force.

[0009] After the steel wire rope and rubber are vulcanized together, the steel wire rope can be fixed to form a steel wire rope core conveyor belt. However, since the two ends of the steel wire rope are in a floating state and the deformation degree of the steel wire rope and the rubber conveyor belt after being pulled is inconsistent, the steel wire rope will be misaligned with the rubber after being pulled, so that the tension degree of the steel wire rope core conveyor belt depends on the bonding strength of the steel wire rope and the rubber after being vulcanized together. The bonding strength of the steel wire rope and the rubber after being vulcanized together is much smaller than the strength of the steel wire rope itself, resulting in the steel wire rope core conveyor belt cannot give full play to the high strength characteristics of the steel wire rope. By adopting the above technical solution, the starting joint and the ending joint of the steel wire rope are welded to the adjacent steel wire ropes using welding blocks to fix the two ends of the steel wire rope, so that the steel wire rope can be fixed. The wire rope can form an integral force-bearing unit. After the steel wire rope core with fixed ends is set in the conveyor belt, the steel wire rope core can independently bear the tensile force, making full use of the strength of the steel wire rope core, thereby improving the strength of the annular steel wire rope core conveyor belt; at the same time, since there is no joint on the steel wire rope core, the tensile limit of the steel wire rope core is the tensile limit of the wire rope. Compared with the steel wire rope core with joints, the high-strength characteristics of the steel wire rope can be more fully utilized, thereby improving the strength of the steel wire rope core conveyor belt; and using multiple welding blocks to weld the starting joint and the ending joint to the adjacent steel wire ropes in an interval welding manner can effectively disperse the stress of the welding position to multiple welding positions, thereby improving the firmness of the welding of the starting joint and the ending joint.

[0010] The setting of the upper core rubber and the lower core rubber can fill the gaps between the steel wire ropes. On the one hand, it can increase the contact area between the upper covering rubber and the lower covering rubber and the middle skeleton layer, and improve the strength of the combination of the upper covering rubber and the lower covering rubber and the middle skeleton layer. On the other hand, it can reduce the contact between pollutants and the steel wire rope core of the middle skeleton layer, reduce the corrosion of pollutants to the steel wire rope core, and thus increase the service life of the steel wire rope core conveyor belt.

[0011] Optionally, the steel wire rope core includes a center strand and multiple outer strands, the multiple outer strands are twisted outside the center strand, the center strand is made by twisting steel wires, and the twist direction of the center strand is opposite to the twist direction of the multiple outer strands outside the center strand.

[0012] When the annular steel wire rope core conveyor belt is working, the conveyor belt will continuously rotate with the conveying, resulting in the accumulation of stress in the steel wire rope, which in turn leads to the risk of deformation of the annular steel wire rope core conveyor belt. The steel wire rope core inside the ordinary steel wire rope core conveyor belt fixed by welding generally adopts the form of cross-arrangement of steel wire ropes with opposite twist directions, so that adjacent steel wire ropes with different twist directions can offset each other's residual stress. However, in the present application, a steel wire rope core is formed by winding a steel wire rope, and two steel wire ropes with different twist directions cannot be used to offset the residual stress, resulting in the risk of stress concentration in the steel wire rope core in the conveyor belt. By adopting the above technical solution The steel wire rope core in the present application adopts a steel wire rope including a center strand and outer strands. The center strand of the steel wire rope adopts a steel wire rope with a twist direction, and the outer strands are wound around the center strand by twisting, and the twist direction of the center strand and the twist direction of the outer strands wound around the steel wire rope are set in opposite directions. In this way, an isotropic steel wire rope with opposite twist directions of the center strand and the outer strand can be formed. During the rotation of the steel wire rope core, the center strand and the outer strand inside have opposite twist directions. Therefore, the steel wire rope core as a whole can offset the internal stress and the external stress so that the stress is not transmitted outward by the way of mutual cancellation, thereby reducing the risk of deformation of the annular steel wire rope core due to stress concentration during transportation.

[0013] Optionally, the plurality of outer strands are made of twisted steel wires, and adjacent outer strands are twisted in opposite directions.

[0014] As the steel wire rope core is wound on the roller with the endless conveyor belt, the steel wire rope core needs to be bent repeatedly and when the steel wire rope transitions from the horizontal section to the groove section, different positions of the steel wire rope will be subjected to different tensile forces, which will lead to concentrated stress inside the steel wire rope with twist direction. By adopting the above technical scheme, when multiple outer strands are twisted around the periphery of the center strand, adjacent outer strands are formed by twisting steel wires with opposite twist directions. In this way, when the steel wire rope core moves as a whole with the endless conveyor belt, the stresses generated in adjacent outer strands will offset each other. In this way, the stress of the center strand and the stress of the external winding offset each other, and the stresses of adjacent outer strands offset each other, making the overall structure of the steel wire rope core more stable, thereby extending the service life of the steel wire rope core.

[0015] Optionally, the welding block is made of low-temperature solder with a welding temperature below 300 degrees.

[0016] When welding the steel wire rope core, the steel wire rope core is in a stretched state. At this time, there is a large stress inside the steel wire rope core. At this time, the steel wire rope is welded and fixed in an ordinary way. On the one hand, the high temperature during welding will cause the properties of the steel wire rope to change, resulting in a decrease in the tensile strength of the steel wire rope, and there is a risk of the steel wire rope being pulled and broken; on the other hand, the thermal stress and participating stress during welding will also be concentrated in the welding area, affecting the strength of the steel wire rope. By adopting the above technical solution, low-temperature solder is used for welding, and the welding temperature is controlled below 300 degrees. The welding temperature is much lower than the melting point of the steel wire rope. When welding the steel wire rope in a stretched state, the steel wire rope will not be burned red, so the stress inside the steel wire rope will change relatively little, thereby being able to greatly reduce the impact on the properties of the steel wire rope, thereby improving the stability of the steel wire rope.

[0017] Optionally, the joints of the upper rubber layer are fixed by step-type butt jointing with a composite rubber sheet, and the joints of the lower rubber layer are fixed by bevel-type butt jointing, and the end surface of the upper rubber layer away from the lower rubber layer is provided with a toothed pattern.

[0018] The stepped docking fixation can increase the contact area at the joint to improve the bonding strength at the joint, thereby improving the overall strength of the joint position. The inclined docking fixation can increase the smoothness of the joint so that the overall thickness of the joint position can be kept consistent. Both the stepped docking method and the inclined docking method can effectively improve the connection strength of the joint position. By adopting the above technical scheme, the upper covering rubber is located on the outer peripheral surface of the circular conveyor belt as a whole and needs to withstand a greater tensile force. Therefore, the upper covering rubber adopts a stepped docking method with stronger bonding strength. The lower covering rubber needs to contact the roller when the circular conveyor belt rotates. The joint position of the lower covering rubber adopts a flatter inclined docking method, so that the joint position of the lower covering rubber can be more stable when it transitions to the roller. While improving the overall strength of the circular conveyor belt, it can also improve the stability of the circular conveyor belt when conveying materials. Arranging a toothed pattern above the upper covering rubber layer is beneficial to improve the friction coefficient between the upper covering rubber layer and the transported materials when the upper covering rubber layer contacts the transported materials, increase the friction between the upper covering rubber layer and the transported materials, and reduce the probability of relative sliding between the transported materials and the circular conveyor belt.

[0019] Second aspect: The present invention provides a production process for an endless jointless toothed transmission steel cord conveyor belt, which adopts the following technical solution: A production process for an endless jointless toothed transmission steel cord conveyor belt, including a belt blank forming process and a vulcanization process. Strip forming process: including material selection step, winding forming step, welding and fixing step and adhesive coating step in sequence; Material selection: Calculate the required wire rope diameter and the number of wire rope windings based on the required strength of the endless conveyor belt; calculate the wire rope winding spacing based on the required width of the endless conveyor belt and the number of wire rope windings; calculate the required wire rope length based on the required length of the endless conveyor belt and the number of windings; Winding forming: setting the offset of the wire rope when winding according to the winding spacing, stretching the wire rope using a traction device, and winding the wire rope using an extrusion roller when the wire rope is stretched; Welding fixation: During the winding process, low-temperature solder is used to weld at the starting position and the end position of the wire rope length. During welding, the starting position and the end position of the wire rope length are welded to the adjacent wire ropes respectively, and multiple points are fixed by low-temperature welding at a certain distance to form a ring-shaped wire rope; Rubber coating: Under tension, the upper core rubber is coated on the top of the circular steel wire rope, and the lower core rubber is coated on the bottom of the circular steel wire rope. After the tension is removed, the upper core rubber is coated with an upper coating rubber composite film, and the lower core rubber is coated with a lower coating rubber composite film, and cold pressing is performed; Vulcanization process: includes adjustment step, preparation step and vulcanization step in sequence; Adjustment: Measure the circumference of both sides of the formed belt blank, place the formed belt blank support on the rollers of the vulcanization equipment, and adjust the roller spacing to compensate for the circumference difference on both sides of the belt blank; Preparation: Select appropriate pads according to the thickness of the belt blank, select appropriate tooth mold according to the tooth pattern of the conveyor belt, and fill the tooth mold with appropriate amount of rubber to form the pattern; Vulcanization: Set the vulcanization temperature, vulcanization time and vulcanization pressure, evenly apply silicone oil on the pad and the toothed mold, and vulcanize the strip section by section. After a section of the strip is vulcanized, cool the pad and the toothed mold. After the pad and the toothed mold are cooled to the set temperature, adjust the position of the strip and vulcanize the next section of the strip.

[0020] By adopting the above technical scheme, since the steel wire rope core in the steel wire rope core conveyor belt is made by winding a whole steel wire rope, the diameter of the steel wire rope can be calculated before winding the steel wire rope through the material selection step, and the required steel wire rope can be determined in combination with the required load capacity of the steel wire rope core conveyor belt and the width of the endless conveyor belt and the number of winding circles. The winding forming step can wind the steel wire rope into the shape of the endless conveyor belt, and process a steel wire rope into the middle skeleton layer of the endless conveyor belt, thereby reducing the welding joints of the steel wire rope core in the endless conveyor belt; the welding fixing step can fix the two ends of the steel wire rope core, so that the steel wire rope core as a whole becomes a part that can independently bear the load. , making full use of the high strength and high toughness of the steel wire rope; the coating step can initially fix and bond the steel wire rope core and the rubber, and the upper core rubber and the lower core rubber in the coating step can fill the gaps in the steel wire rope core during the cold pressing process, which can improve the bonding strength on the one hand, and reduce the contact between stains and the steel wire rope core on the other hand, thereby improving the service life of the steel wire rope core; the adjustment step in the vulcanization process can adjust the circumference of both sides of the belt embryo, so that the overall force of the belt embryo is more uniform after stretching; the vulcanization step can change the properties of the rubber in the belt embryo, tightly combine the rubber and the steel wire rope core to form a whole, and form a toothed pattern on the outer surface of the steel wire rope core conveyor belt where a toothed mold is provided.

[0021] Optionally, an initial position determination step is further provided between the winding forming step and the welding fixing step; Initial position determination: After the wire rope is wound a certain number of times, the position with good tension is selected as the starting position of the wire rope length, and the wire rope before the starting position is cut off, and the starting position of the wire rope plus the length of the wire rope are added to obtain the ending position of the wire rope length.

[0022] When the wire rope is being wound, during the initial winding process, the speed at which the wire rope is pulled out is unstable, resulting in uneven tension distribution inside the wire rope. By adopting the above technical solution, the wire rope with uneven tension distribution can be cut off, and a wire rope with stable tension can be selected for subsequent winding to form an intermediate skeleton layer, thereby improving the overall stability of the intermediate skeleton layer.

[0023] Optionally, a glue coating step is further provided between the material selection step and the winding molding step: Glue coating: Choose appropriate core rubber to coat the outside of the wire rope so that the core rubber forms a uniform coating on the outside of the wire rope.

[0024] By adopting the above technical scheme, the glue coating process can cover the steel wire rope before winding it. On the one hand, it can reduce the probability of contact between the steel wire rope and stains during the winding process and improve the service life of the steel wire rope. On the other hand, the glue coating process can preliminarily fill the gaps between the steel wire ropes, so that in the subsequent glue coating step, the upper core rubber, the lower core rubber and the steel wire rope can be better tightly combined.

[0025] Optionally, a pattern alignment step is provided between the preparatory step and the vulcanization step; Alignment: Reserve a specified number of tooth patterns on the edge of the toothed mold without filling with rubber for alignment with the existing pattern, and adjust by stretching the strip blank during the alignment process between the toothed mold and the existing pattern.

[0026] By adopting the above technical solution, the pattern alignment step can improve the alignment state of the pattern when it is vulcanized on the endless conveyor belt, and adjust the position of the pattern on the endless conveyor belt by stretching the belt blank in the pattern alignment step, thereby reducing the probability of incomplete pattern or pattern extrusion and accurately controlling the spacing between patterns.

[0027] In summary, the present invention includes at least one of the following beneficial technical effects: The steel wire rope core in the annular steel wire rope core conveyor belt of the present invention is made by winding a whole steel wire rope, and the wound steel wire rope core as a whole has no connecting joints. When the steel wire rope core is pulled, the stress will not be concentrated at a certain position such as the joint, thereby reducing the probability of the steel wire rope core breaking at the stress concentration position when bearing load.

[0028] The steel wire rope core used to make the middle skeleton layer is made of steel wire ropes with opposite twist directions for the center strand and the outer strands. The residual stress in the center strand and the residual stress in the outer strands will cancel each other out due to the opposite twist directions. The multiple outer strands are made in a way that adjacent outer strands are twisted in opposite directions. The opposite twist directions of adjacent outer strands will cancel out the residual stress in the outer strands, thereby reducing the risk of stress concentration in the steel wire rope.

[0029] By welding the two ends of the steel wire rope to the adjacent steel wire ropes respectively, the two ends of the steel wire rope can be fixed to form an intermediate skeleton layer that can independently withstand tension, making fuller use of the high-strength characteristics of the steel wire rope, thereby improving the carrying capacity of the steel wire rope core conveyor belt; at the same time, when fixing the two ends of the steel wire rope core, use low-temperature solder and multi-point welding to weld and fix them. On the one hand, it can reduce the impact of high temperature on the internal structure of the steel wire rope and maintain the stability of the steel wire rope structure. On the other hand, it can disperse the stress at multiple welding points, reduce the welding looseness caused by stress concentration at one position, and improve the overall stability of the steel wire rope.

[0030] In the production process of wire rope, the wire rope is stretched and wound and the ends of the wire rope are fixed by low-temperature welding. This can fully utilize the high strength and toughness of the wire rope to make a ring-shaped wire rope core conveyor belt with stronger load-bearing capacity. The wire rope with uneven tension distribution before the initial position during the winding process will be cut off, which can improve the overall stability of the middle skeleton layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Figure 2 yes Figure 1 A partial enlarged schematic diagram of part A; Figure 3 yes Figure 2 A partial cross-sectional schematic diagram of part B; Figure 4 is a schematic diagram of the intermediate skeleton layer in Example 1 of the present invention; Figure 5 It is a schematic diagram of the twist direction of the steel wire rope in Example 1 of the present invention.

[0032] Explanation of the accompanying drawings: 1. upper covering rubber layer; 11. tooth-shaped pattern; 2. lower covering rubber layer; 3. middle skeleton layer; 31. steel wire rope core; 311. starting joint; 312. ending joint; 32. welding block; 33. center strand; 34. outer strand; 4. upper core rubber layer; 5. lower core rubber layer. DETAILED DESCRIPTION

[0033] Existing steel wire rope core conveyor belts are generally produced as parallel conveyor belts during production, and are then cut into required lengths and welded into annular conveyor belts when used and sold. When welding the parallel conveyor belts into annular conveyor belts, it is first necessary to scrape off the external vulcanized layers at both ends of the parallel conveyor belts, and then weld the steel wire ropes at both ends when the internal steel wire rope core of the parallel conveyor belt is exposed, and finally use rubber vulcanization to form a vulcanized joint at the welding position, so as to process the parallel conveyor belt into annular conveyor belt. However, the strength of the welding part of the steel wire rope is not as good as that of the steel wire rope itself, resulting in stress concentration at the welding joint when the steel wire rope core is subjected to force, and there is a risk of joint breakage.

[0034] The prior art simply winds the steel wire rope around the lower covering rubber layer to form a jointless steel wire rope core skeleton structure, which can effectively reduce the risk of breakage at the welding part of the steel wire rope joint. However, the two ends of the steel wire rope are not fixed, which will cause the stress limit of the steel wire rope to be the stress limit of the connection between the steel wire rope and the upper covering glue and the lower covering glue, and the high strength and high toughness of the steel wire rope itself cannot be effectively exerted. Simply welding the steel wire rope to the adjacent steel wire ropes will form a welded joint at the end of the steel wire rope, resulting in the problem of stress concentration. Therefore, how to make full use of the high strength and high toughness of the steel wire rope to make a steel wire rope core conveyor belt is the core problem to be solved by the present invention.

[0035] The following combination Figures 1 to 5 The present invention is described in further detail.

[0036] Embodiment 1: The embodiment of the present invention discloses an annular seamless steel wire rope core 31 conveyor belt. Figures 1 to 3 A ring-shaped jointless toothed transmission steel wire rope core conveyor belt mainly comprises an upper covering rubber layer 1, an upper core rubber layer 4, an intermediate skeleton layer 3, a lower core rubber layer 5 and a lower covering rubber layer 2, wherein the upper core rubber layer 4 and the lower core rubber layer 5 are coated on both sides of the intermediate skeleton layer 3 with the same rubber material, the upper covering rubber layer 1 and the lower covering rubber layer 2 are coated on both sides of the upper core rubber layer 4 and the lower core rubber layer 5 with composite rubber material, and the intermediate skeleton layer 3 is formed by winding a steel wire rope, and finally the various layer structures are vulcanized together through a vulcanization process to form a ring-shaped conveyor belt.

[0037] Reference Figure 4 and Figure 5The middle skeleton layer 3 is made of steel wire rope. In this embodiment, the steel wire rope is wound with a non-twisted steel wire rope with a diameter of 3.7 mm. The non-twisted steel wire rope in this embodiment refers to a steel wire rope in which the stress inside the steel wire rope can offset each other. The specific steel wire rope includes an intermediate strand and a plurality of outer strands 34 wound around the outside of the center strand 33. In this embodiment, there are six groups of outer strands 34. The center strand 33 adopts a left-twisted steel wire rope. The six groups of outer strands 34 are all wound around the outside of the center strand 33 in a right-twisted manner. At the same time, the six groups of outer strands 34 are all wound with steel wire ropes with twist directions. The six groups of outer strands 34 are wound in a manner of opposite twist directions in adjacent directions. Specifically, any of the six groups of outer strands 34 A group of outer strands 34 are numbered as No. 1, No. 2, ..., No. 5, and No. 6, among which the outer strands 34 numbered No. 1, No. 3, and No. 5 are made of left-twist steel wire ropes, and the outer strands 34 numbered No. 2, No. 4, and No. 6 are made of right-twist steel wire ropes. In this way, the left twist of the center strand 33 and the right twist of the outer strands 34 wound as a whole on the outside of the center strand 33 can offset each other when stress is generated; the outer strands 34 with opposite twists can offset each other when subjected to stress, so that when the untwisted steel wire rope in this embodiment is used in an endless conveyor belt, the stress generated by the steel wire rope when repeatedly stretched can be offset by itself internally, thereby improving the stability of the endless conveyor belt.

[0038] In other embodiments, the twist directions of the center strands 33 and the outer strands 34 in the steel wire and the number of groups of the outer strands 34 are not limited, and the specific conditions are based on the ability to offset the stresses inside the steel wire rope. The implementation method provided in this embodiment is only a preferred solution.

[0039] Reference Figure 3 Before winding, the steel wire rope is coated with a layer of rubber with a thickness of 0.4 mm on the outside through an extruder. The diameter of the steel wire rope core 31 after rubber coating is 4.5 mm. On the one hand, rubber coating on the outside of the steel wire rope can reduce the chance of contact between the steel wire rope and stains and reduce the probability of corrosion of the steel wire rope. On the other hand, it can better fill the gaps in the steel wire rope so that the steel wire rope and the external rubber can be better combined in the future.

[0040] Reference Figure 1 and Figure 4After the steel wire rope is coated with rubber, the whole steel wire rope is wound on the roller, and the winding direction of the steel wire rope is set to be consistent with the conveying direction of the endless conveyor belt to form a steel wire rope core 31, and the two ends of the steel wire rope core 31 are respectively welded to the adjacent steel wire ropes through welding blocks 32 for fixing, so that the steel wire rope core 31 forms an independent force-bearing unit; in this way, when the steel wire rope core 31 is pulled, since the two ends of the steel wire rope are fixed, the tension will be transmitted along the direction of the steel wire rope, and finally evenly distributed in the steel wire rope core 31; and since the steel wire rope core 31 is a whole steel wire as a whole, there is no welding joint in the middle, and the overall strength level of the steel wire rope core 31 is consistent, so that the ultimate tension that the steel wire rope can withstand is the ultimate tension that the steel wire rope can withstand, so that the steel wire rope core 31 can give full play to the high strength characteristics of the steel wire rope.

[0041] Reference Figure 4 When welding the starting joint 311 and the ending joint 312 at both ends of the steel wire rope respectively, welding blocks such as copper-aluminum low-temperature solder are used to weld the steel wire rope, and the welding temperature is controlled below 300 degrees Celsius. This can reduce the concentration of thermal stress at the welding position during welding, and at the same time reduce the deformation of the steel wire rope caused by burning the steel wire rope red during welding; especially in the present application, the steel wire rope is welded under tension, and the strength of the steel wire rope will be reduced after the steel wire rope is burned red, and there is a risk of breaking the steel wire rope. Therefore, using low-temperature solder to weld the end of the steel wire rope core 31 can reduce the influence of high temperature on the structural stability of the steel wire rope core 31, and improve the overall stability of the steel wire rope core 31.

[0042] Reference Figure 4 When welding the starting joint 311 and the ending joint 312 of the steel wire rope core 31, the starting joint 311 and the ending joint 312 of the steel wire rope core 31 are welded and fixed by using the method of multiple-point welding at intervals. Specifically, the rubber coating outside the starting position and the ending position is first cut off, and then six places are welded at the starting position and the ending position by welding one centimeter at every ten centimeters, and the initial position and the ending position of the steel wire rope core 31 are welded and fixed respectively. In this way, the initial position and the ending position of the steel wire rope core 31 are fixed by multiple-point welding. On the one hand, the stress can be dispersed in multiple positions, reducing the weak welding caused by the concentration of stress in one position, and on the other hand, the area of ​​welding fixation can be increased, and the strength of fixation during welding can be improved.

[0043] Reference Figure 3After the steel wire rope is wound and welded to be fixed, the steel wire rope core 31 as a whole forms an intermediate skeleton layer 3. At this time, a 1mm thick upper core rubber is filled above the intermediate skeleton layer 3 to form an upper core rubber layer 4, and a 1mm thick lower core rubber is filled below the intermediate skeleton layer 3 to form a lower core rubber layer 5. Secondly, a layer of 5mm thick composite film is coated on the upper core rubber layer 4 to form an upper covering rubber layer 1, and a layer of 5mm thick composite film is coated below the lower core rubber layer 5 to form a lower covering rubber layer 2, wherein the upper covering rubber layer 1 adopts a step-butting method for each layer of composite film, and the joint of the lower covering rubber layer 2 adopts an inclined surface butt joint method, and glue is used at the joint to ensure that the joint can be well bonded, and again a toothed mold is set above the upper covering rubber layer 1 and rubber is filled in the toothed mold, and finally the whole is vulcanized to form an annular jointless toothed transmission steel wire rope core conveyor belt.

[0044] During this process, the setting of the upper core rubber layer 4 and the lower core rubber layer 5 can fill the gaps between the steel wire ropes, increase the contact area between the upper rubber layer 1 and the lower rubber layer 2 and the middle skeleton layer 3, and improve the strength of the upper rubber layer 1 and the lower rubber layer 2 and the middle skeleton layer 3. The upper rubber layer 1 is located on the outer peripheral surface of the circular conveyor belt as a whole and needs to withstand a greater tensile force. Therefore, the upper rubber layer 1 adopts a stepped docking method with stronger bonding strength; the lower rubber layer 2 needs to contact the roller when the circular conveyor belt rotates, and a smoother inclined docking method is adopted, so that the joint position of the lower rubber layer 2 can be more stable when transitioning to the roller, thereby improving the stability of the circular conveyor belt when conveying materials; the toothed pattern 11 can increase the friction between the upper rubber layer 1 and the conveyed materials, thereby improving the stability during transportation of materials.

[0045] The implementation principle of an annular jointless steel cord core 31 conveyor belt according to the embodiment of the present invention is as follows: First, the steel wire rope is twisted in a set direction, and the twisted steel wire rope is twisted together as a whole to form a non-twisted steel wire rope. Secondly, the steel wire rope is coated with rubber and the coated steel wire rope is wound. The two ends of the steel wire rope wound into a ring are fixed by low-temperature welding to form an intermediate skeleton layer 3. Finally, an upper core rubber layer 4 and an upper covering rubber layer 1 are arranged in sequence above the intermediate skeleton layer 3, and a lower core rubber layer 5 and a lower covering rubber layer 2 are arranged in sequence below the intermediate skeleton layer 3. The upper covering rubber layer 1, the upper core rubber layer 4, the intermediate skeleton layer 3, the lower core rubber layer 5 and the lower covering rubber layer 2 are vulcanized into a whole through a vulcanization process to form an annular jointless toothed transmission steel wire rope core conveyor belt.

[0046] Embodiment 2: The embodiment of the present invention discloses a production process of an endless jointless toothed transmission steel cord conveyor belt, which specifically comprises the following steps: S1: Calculate the required wire rope diameter and the number of wire rope windings according to the required strength of the endless conveyor belt, calculate the wire rope winding spacing according to the required width of the endless conveyor belt and the number of wire rope windings, and calculate the required wire rope length according to the required length of the endless conveyor belt and the number of windings; Since the smaller the winding spacing of the wire rope is set, the smaller the space for the wire rope to move in the width direction of the endless conveyor belt, the more stable the intermediate skeleton layer formed after the wire rope is wound, therefore, it is preferred to use a relatively small diameter wire rope, and measure the ultimate tension Rm that a single wire rope with a certain diameter can bear through a tension measuring device, and calculate the number of winding turns n according to the ultimate load strength ST of the endless conveyor belt to be produced. The specific calculation method is: , where 2Rm means that two steel wire ropes bear the tension in one winding. The winding spacing d=W / n is determined according to the width W of the endless conveyor belt. The winding spacing is the offset of the steel wire rope in one direction when the steel wire rope is wound. The required length of the steel wire rope L= , where l is the length of the endless conveyor belt, and d is the winding spacing. When selecting materials, the length L of the wire rope can be used as a judgment in advance to select a wire rope of appropriate length to avoid the phenomenon of insufficient wire rope length and waste. After selecting a wire rope of appropriate length, the wire rope can be flexibly cut according to the winding situation of the wire rope core.

[0047] S2: Select appropriate core rubber to coat the outside of the wire rope so that the core rubber forms a uniform coating on the outside of the wire rope; When rubber coating the wire rope, take the extruder as an example, the rubber is coated by continuous feeding through the cold feed extruder. The rubber strip should be thin enough and cannot be stuck in the middle. Set the extruder head temperature to 90℃; barrel 85℃; feeding section 80℃; when the diameter of the wire rope is 3.7mm, the diameter of the wire after rubber coating is 4.5mm, and the machine cannot be stopped during the extrusion process. When the wire rope is welded, the extruder can run at a low speed. The extrusion speed and the molding speed must match. At the beginning until the wire rope is welded, the speed is set to 3 meters / minute, and 8 meters / minute is guaranteed after normal operation.

[0048] S3: setting an offset amount when the wire rope is wound according to the winding spacing, stretching the wire rope using a traction device, and winding the wire rope using a squeezing roller when the wire rope is stretched; When winding the steel wire rope, it is necessary to use a traction device to stretch the steel wire rope, and control the steel wire rope to continuously deviate a distance d in one direction during the winding process through a cheap device; the traction device is based on just being able to pull out the steel wire rope to prevent the rubber coating of the extruded steel wire rope from rupturing; when winding the steel wire rope, the steel wire rope is wound on a forming machine to form a ring structure. The inner circumference of the first roller of the forming machine is 13336mm, and the outer circumference is 13338mm; the tension of the formed steel wire rope is about 744N.

[0049] S4: After the steel wire rope is wound a certain number of times, a position with good tension is selected as the starting position of the steel wire rope length, and the steel wire rope before the starting position is cut off, and the starting position of the steel wire rope plus the length of the steel wire rope are added to obtain the ending position of the steel wire rope length; During the winding process, the traction device and the forming device operate unstably in the initial stage, resulting in uneven force on the initial part of the wire rope. Therefore, after the wire rope is wound around the fifth circle, find the two outermost wire ropes with good tension, peel off the rubber coating at two evenly spaced locations on the circumference, and weld them under tension. This position is used as the initial position of the wire rope, and the terminal position of the wire rope can be determined based on the situation after winding.

[0050] S5: During the winding process, low-temperature solder is used to weld at the starting position and the ending position of the length of the steel wire rope. During welding, the starting position and the ending position of the length of the steel wire rope are respectively welded to the adjacent steel wire ropes, and multiple points are fixed by low-temperature welding at intervals to form a ring-shaped steel wire rope; When welding the initial and end positions of the wire rope, the welding speed should be fast, and the solder should penetrate into the middle of the two adjacent ropes for a strong weld. Low-temperature solder such as copper-aluminum alloy should be used for welding, and the welding temperature should be kept below 300°C to ensure that the wire rope will not be burned red.

[0051] S6: Under tension, the upper core rubber is coated on the annular steel wire rope, and the lower core rubber is coated on the lower annular steel wire rope. After the tension is removed, the upper core rubber is coated with an upper covering rubber composite film, and the lower core rubber is coated with a lower covering rubber composite film, and cold pressing is performed; After the wire rope is wound and under tension, a layer of 1mm core rubber is wrapped on the upper and lower parts of the wire rope. After releasing the tension, a layer of 5mm thick composite rubber is wrapped on the upper and lower parts, and cold pressed for 10 seconds. The distance between the roller and the belt core should be such that the grooved roller does not extrude grooves on the surface of the inner layer of rubber. The upper covering rubber joint adopts a stepped docking method for each layer of composite rubber, and the lower covering rubber joint adopts an oblique docking method. Glue is used to ensure that the joints can be well bonded. After connection, cold pressing is performed. The thickness of the formed belt blank is 16.5mm±0.1mm. After the belt blank is formed, the edges are manually cut to ensure that the width of the edge glue on both sides is uniform. The width of the belt blank is 905mm±1mm.

[0052] S7: Measure the circumference of both sides of the formed belt blank, support and place the formed belt blank on the rollers of the vulcanization equipment, and adjust the roller spacing to compensate for the circumference difference on both sides of the belt blank; After the belt blank is formed, the circumference of both sides of the belt blank is measured, and according to the measured length of both sides of the belt blank, the circumference difference between the two rollers of the vulcanizer is adjusted in advance to compensate for the length difference on both sides of the belt blank caused by forming, so as to ensure that the length of both sides of the belt blank after adjustment is consistent; before vulcanization, the flat section length of the belt blank is stretched to 13320mm under tension on the vulcanizer, and the length is measured on both sides of the flat section of the belt blank; when adjusting the length of the belt blank, be careful not to let the belt blank stay in the same position in the pot for too long to prevent scorching; in this way, the overall force of the processed conveyor belt can be consistent, reducing the stress concentration on the side with a smaller circumference, thereby improving the stability of the conveyor belt.

[0053] S8: Select appropriate pads according to the thickness of the belt blank, select appropriate tooth mold according to the tooth pattern of the conveyor belt, and fill the tooth mold with appropriate amount of rubber to form the pattern; Determine the shim according to the thickness of the belt blank and select a suitable shim. Under normal circumstances, the difference between the thickness of the shim and the thickness of the belt blank does not exceed 1mm. In this embodiment, the thickness of the belt blank is 16.5mm, so a 16mm shim is selected. The tooth pattern mold depends on the shape of the tooth pattern.

[0054] S9: A specified amount of tooth-shaped pattern without rubber filling is reserved at the edge of the tooth-shaped mold for alignment with the existing pattern, and the tooth-shaped mold is adjusted by stretching the strip blank during the alignment process with the existing pattern; When aligning the tooth-shaped patterns, each pot must be put on the stove, and attention must be paid to the status of the pattern and the template during the process. The pattern must not be squeezed. When each pot is put on the stove at the cooked end, 4 cooked patterns should be retained. It is best to mark the first outermost pattern in the pot before putting it on the stove to prevent under-filling. If under-filling is done, the fourth pattern in the pot will appear to be under-sulfurized. When aligning the last pot, observe whether the cooked patterns in the entire pot can match the template. If not, it can generally be adjusted by stretching.

[0055] S10: setting the vulcanization temperature, vulcanization time and vulcanization pressure, evenly applying silicone oil on the pad iron and the tooth-shaped mold to vulcanize and mold the strip section by section, and cooling the pad iron and the tooth-shaped mold after vulcanizing and molding a section of the strip, adjusting the position of the strip after the pad iron and the tooth-shaped mold are cooled to the set temperature, and vulcanizing and molding the next section of the strip; Before vulcanization, each pot should be evenly coated with silicone oil. Under normal circumstances, a mixture of gasoline: silicone oil = 20:1 is used. The silicone oil concentration should be adjusted depending on whether the edge of the pattern is full and whether silicone oil grooves appear. The silicone oil in the pad iron part should be thicker in each pot to improve the fluidity of the lost rubber edge to ensure that the pattern is full. During vulcanization, set the vulcanization temperature: 150-155℃, vulcanization time: 60 minutes, and vulcanization gauge pressure 14Mpa. During the vulcanization process, the belt is always in a tension state. After the vulcanization is completed, each pot should be sprayed with water to cool down. After the last pot is taken out of the pot, it is better to spray water to cool down to below 60℃ while running to prevent the pattern size from being affected during the rest process.

[0056] The implementation principle of the production process of an endless jointless toothed transmission steel cord conveyor belt according to the embodiment of the present invention is as follows: Firstly, according to the size and model of the required endless conveyor belt, a suitable steel wire rope is selected, and the steel wire rope is used as the core, and the outer surface of the steel wire rope is coated with rubber. The steel wire rope after the rubber coating is wound into a molding step and welded and fixed to form an intermediate skeleton layer that can bear the tension alone. Secondly, the core rubber and the coating rubber are coated on both sides of the intermediate skeleton layer by means of rubber coating, and a ring-shaped jointless toothed transmission steel wire rope core conveyor belt blank is initially formed by cold pressing. The belt blank is adjusted again to make the overall size of the belt blank consistent, so that the tension can be evenly distributed inside the belt blank, and finally the adjusted The belt blank is vulcanized and formed to form a finished product of an annular jointless toothed transmission steel wire rope core conveyor belt; before welding and fixing the belt blank, the steel wire rope with uneven tension distribution in the initial winding part needs to be cut off, and the part with uniform tension distribution is selected for welding and fixing as the intermediate skeleton layer, and the steel wire rope is fixed by low-temperature welding during welding to reduce the influence of high temperature on the steel wire rope core conveyor belt; during the vulcanization step, since it is necessary to set a toothed pattern on the surface of the annular conveyor belt, it is necessary to perform a pattern alignment step, so as to accurately control the precision of the toothed pattern on the surface of the annular conveyor belt.

[0057] To summarize, the annular jointless toothed transmission steel wire rope core conveyor belt of the present application is formed into an intermediate skeleton layer by winding a whole steel wire rope, thereby eliminating the welding joints of the steel wire rope. Therefore, when the steel wire rope is pulled, the stress will not be concentrated at the position such as the joint, so that the tensile capacity of each part of the intermediate skeleton layer is relatively consistent, reducing the probability of stress concentration at a certain position when the intermediate skeleton layer is under load, causing the steel wire rope to break, making full use of the strength of the steel wire rope, and helping to improve the strength of the steel wire rope core conveyor belt; at the same time, the steel wire rope made into the intermediate skeleton layer adopts a steel wire rope with opposite twist directions for the center strand and the outer strand, and the residual stress of the center strand and the residual stress of the outer strand can offset each other; multiple outer strands are made by adjacent outer strands with opposite twist directions, and the adjacent outer strands are made The residual stresses in the strands offset each other, thereby reducing the risk of stress concentration in the middle skeleton layer, further improving the strength of the steel wire rope core conveyor belt; the two ends of the steel wire rope are fixed by multi-point low-temperature welding. On the one hand, it can reduce the impact of high temperature on the internal structure of the steel wire rope and maintain the stability of the steel wire rope structure; on the other hand, it can disperse the stress at multiple welding points, reduce the loose welding caused by stress concentration at one welding point, and at the same time, it can maximize the fixing area of ​​the welding part, increase the welding strength, and thus increase the strength of the middle skeleton layer; in the welding process, the part with uniform tension distribution after winding is selected as the middle skeleton layer, and the steel wire rope with uneven tension distribution is cut off, which can improve the overall stability of the middle skeleton layer.

[0058] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An endless jointless toothed transmission steel cord conveyor belt, comprising an upper rubber layer (1), a lower rubber layer (2) and an intermediate skeleton layer (3), wherein the upper rubber layer (1) and the lower rubber layer (2) are respectively arranged on both sides of the intermediate skeleton layer (3), characterized in that: The intermediate skeleton layer (3) is made by winding a steel wire core (31), the winding direction of the steel wire core (31) is consistent with the length direction of the conveyor belt, and the two ends of the steel wire core (31) are respectively provided with a starting joint (311) and an ending joint (312), and the starting joint (311) and the ending joint (312) are respectively welded to the steel wire core (31) at adjacent positions through a plurality of welding blocks (32), and the plurality of welding blocks (32) are arranged at intervals; An upper core rubber layer (4) is arranged between the intermediate skeleton layer (3) and the upper covering rubber layer (1), and a lower core rubber layer (5) is arranged between the intermediate skeleton layer (3) and the lower covering rubber layer (2); the upper covering rubber layer (1), the upper core rubber layer (4), the intermediate skeleton layer (3), the lower core rubber layer (5) and the lower covering rubber layer (2) are fixedly arranged as a whole.

2. The endless jointless toothed transmission steel cord conveyor belt according to claim 1, characterized in that: The steel wire rope core (31) comprises a central strand (33) and a plurality of outer strands (34), wherein the plurality of outer strands (34) are twisted on the outside of the central strand (33), the central strand (33) is made by twisting steel wires, and the twist direction of the central strand (33) is opposite to the twist direction of the plurality of outer strands (34) on the outside of the central strand (33).

3. The endless jointless toothed transmission steel cord conveyor belt according to claim 2, characterized in that: The plurality of outer strands (34) are all made by twisting steel wires, and adjacent outer strands (34) are twisted in opposite directions.

4. The endless jointless toothed transmission steel cord conveyor belt according to claim 1, characterized in that: The material of the welding block (32) is low-temperature solder with a welding temperature below 300 degrees.

5. An endless jointless toothed transmission steel cord conveyor belt according to any one of claims 1 to 4, characterized in that: The joints of the upper rubber layer (1) are fixed by composite rubber step-type butt jointing, and the joints of the lower rubber layer (2) are fixed by bevel-type butt jointing. The end surface of the upper rubber layer (1) away from the lower rubber layer (2) is provided with a tooth-shaped pattern (11).

6. A production process for an endless jointless toothed transmission steel cord conveyor belt, characterized in that: Including strip molding process and vulcanization process, Strip forming process: including material selection step, winding forming step, welding and fixing step and adhesive coating step in sequence; Material selection: Calculate the required wire rope diameter and the number of wire rope windings based on the required strength of the endless conveyor belt; calculate the wire rope winding spacing based on the required width of the endless conveyor belt and the number of wire rope windings; calculate the required wire rope length based on the required length of the endless conveyor belt and the number of windings; Winding: The offset of the wire rope winding is set according to the winding pitch, the wire rope is stretched by a traction device, and the wire rope is wound by a squeezing roller when the wire rope is stretched; Welding fixation: During the winding process, low-temperature solder is used to weld at the starting position and the end position of the wire rope length. During welding, the starting position and the end position of the wire rope length are welded to the adjacent wire ropes respectively, and multiple points are fixed by low-temperature welding at a certain distance to form a ring-shaped wire rope; Rubber coating: Under tension, the upper core rubber is coated on the top of the circular steel wire rope, and the lower core rubber is coated on the bottom of the circular steel wire rope. After the tension is removed, the upper core rubber is coated with an upper coating rubber composite film, and the lower core rubber is coated with a lower coating rubber composite film, and cold pressing is performed; Vulcanization process: includes adjustment step, preparation step and vulcanization step in sequence; Adjustment: Measure the circumference of both sides of the formed belt blank, place the formed belt blank support on the rollers of the vulcanization equipment, and adjust the roller spacing to compensate for the circumference difference on both sides of the belt blank; Preparation: Select appropriate pads according to the thickness of the belt blank, select appropriate tooth mold according to the tooth pattern of the conveyor belt, and fill the tooth mold with appropriate amount of rubber to form the pattern; Vulcanization: Set the vulcanization temperature, vulcanization time and vulcanization pressure, evenly apply silicone oil on the pad and the toothed mold, and vulcanize the strip section by section. After a section of the strip is vulcanized, cool the pad and the toothed mold. After the pad and the toothed mold are cooled to the set temperature, adjust the position of the strip and vulcanize the next section of the strip.

7. The production process of an endless jointless toothed transmission steel cord conveyor belt according to claim 6, characterized in that: An initial position determination step is also provided between the winding forming step and the welding fixing step; Initial position determination: After the wire rope is wound a certain number of times, the position with good tension is selected as the starting position of the wire rope length, and the wire rope before the starting position is cut off, and the starting position of the wire rope plus the length of the wire rope are added to obtain the ending position of the wire rope length.

8. The production process of an endless jointless toothed transmission steel cord conveyor belt according to claim 6, characterized in that: A glue coating step is also provided between the material selection step and the winding molding step: Glue coating: Choose appropriate core rubber to coat the outside of the wire rope so that the core rubber forms a uniform coating on the outside of the wire rope.

9. The production process of an endless jointless toothed transmission steel cord conveyor belt according to claim 6, characterized in that: A pattern alignment step is provided between the preparatory step and the vulcanization step; Alignment: Reserve a specified number of tooth patterns on the edge of the toothed mold without filling with rubber for alignment with the existing pattern, and adjust by stretching the strip blank during the alignment process between the toothed mold and the existing pattern.

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