A pressure-resistant bicycle tire and its manufacturing method

Abstract

This invention provides a pressure-resistant bicycle tire and its manufacturing method, belonging to the field of bicycle tire technology. It solves the problem that existing bicycle tires lack a pressure resistance testing process after production. The manufacturing method includes the following steps: selecting rubber raw materials, cutting into treads, steel wire extrusion molding, open mill calendering, splicing, pressing, rolling, high-temperature vulcanization, pressing the outer ring pattern, and pressure testing. Compared with existing technologies, this manufacturing process can automatically complete the tire rotation and pressure resistance testing processes, achieving a high degree of automation and producing tires with good strength.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of bicycle tire manufacturing, and relates to a pressure-resistant bicycle tire and a preparation method. BACKGROUND

[0002] A bicycle tire is manufactured through processes such as rubber mixing, extrusion, calendering, molding, and vulcanization. Usually, the bicycle tire is directly put into use after molding is completed. However, in order to improve product quality, it is necessary to add a process for detecting whether the pressure strength of each position of the hub meets the standard after the tire is finished, especially for mountain bikes that need to run on a harsh ground surface, the strength requirement for the tire is higher, so it is more necessary to produce such a tire with a pressure detection process.

[0003] In order to detect the pressure of each position of the tire, the tire needs to be fixed (the tire is mounted on the hub, and then the hub is fixed to fix the tire; or in the case that some manufacturers do not process finished tires, the tire can be fixed through a temporary support similar to the hub, and then the temporary support is fixed), and then a pressure detection device with a pressure sensor and a controller is used to apply pressure to each position of the hub. The process of applying pressure can use two symmetrical extrusion claws (two extrusion claws need to be matched with a pneumatic cylinder or a hydraulic cylinder to provide driving power to realize the expansion and contraction function, and the pneumatic cylinder or the hydraulic cylinder is operated by the controller). The pressure value is preset (the preset pressure value is the standard pressure value for judging the pressure resistance of the tire, and if the tire does not burst after being subjected to the preset pressure value, it proves that the pressure resistance of the tire at this position is qualified). Then the controller controls the extrusion claws to extrude the tire from both sides. The pressure value detected by the pressure sensor will become larger and larger during the process of gradually extruding the tire from both sides by the extrusion claws, until the pressure value detected by the pressure sensor reaches the preset pressure value, which proves that the pressure resistance of the tire at this position is qualified.

[0004] Because the pressure detection device can only detect one position of the tire at a time, in order to detect the pressure of each position of the tire, the tire needs to be rotated to switch the detection position (the support for fixing the hub is rotated, and the tire is rotated together). The pressure detection device has a certain range of recognition for the pressure resistance of the tire in a single detection, for example, a 360° tire is detected at 0° by the pressure detection device and is qualified. If the recognition range of the pressure detection device is 45°, it can be recognized that the pressure resistance of the tire from -22.5° to 22.5° is qualified. That is, under the condition that the pressure resistance judgment range is 45°, the tire needs to be detected 8 times and the detection direction is switched by 45° after each detection to complete the pressure detection of the entire tire.

[0005] Therefore, it is urgent to develop a device capable of automatically detecting the pressure strength of each position of the tire, and the device needs to have the function of automatically adjusting the tire angle to change the detection position. SUMMARY

[0006] The purpose of the present application is to solve the problem that the existing bicycle tire does not have a pressure strength detection process after production is completed.

[0007] The purpose of the present application can be achieved by the following technical solutions:

[0008] A bicycle pressure-resistant tire and a preparation method thereof, characterized by comprising the following steps:

[0009] Step 1: selecting rubber mixing raw materials, using a closed rubber mixing machine, mixing and pressing, raising the temperature to 90-100℃, and continuously mixing and refining for 6-8 minutes, and then cooling the rubber sheet through a rubber mixing machine;

[0010] Step 2: put the rubber sheet into the rubber mixing machine and then into the tread extruder, raise the temperature to 80-85℃, and then cut into the tread;

[0011] Step 3: extrude the steel wire into a fixed size circle;

[0012] Step 4: flatten and tighten the cord into a four-roll calender, preheat and press the rubber through the rubber mixing machine, and raise the temperature to 80-90℃, and then roll into the calender;

[0013] Step 5: cross-wound the cut cloth on the forming machine head, hang the steel wire ring at both ends, tightly wrap the steel wire ring with the opposite edges of the two layers of cloth, and then bond the tread to the cloth at the 360-degree joint, press the head, and roll to form a fixed embryo;

[0014] Step 6: use the tire embryo inflator to inflate the tire embryo to form the required arc for vulcanization, then put the tire into a high-temperature vulcanizing machine, vulcanize at a temperature above 130℃ for 30-60 minutes, and press the outer ring pattern of the tire through the mold, take out the tire after vulcanization, and obtain the finished tire;

[0015] Step 7: place the finished tire on a temporary support and put it into a pressure detection device, evenly divide the tire circumference into multiple arcs, the coverage angle of the arc is 45-60°, then test the first arc through the pressure detection device, switch the angle of the tire through the detection adjusting device, switch the subsequent arcs to the detection position, and when all the arcs pass the pressure strength test, remove the temporary support, and the tire is a pressure-resistant tire.

[0016] The detection direction adjusting device and the pressure detection device involved in the preparation process are specially applied to a pressure detection equipment for verifying whether the tire pressure intensity meets the standard, the pressure detection equipment is composed of the detection direction adjusting device and the pressure detection device, the pressure detection device is used for detecting the tire pressure intensity, and the detection direction adjusting device is used for fixing and rotating to adjust the angle position of the tire.

[0017] In the preparation method of the pressure-resistant tire for bicycles, the detection direction adjusting device comprises a fixedly arranged support plate, a vertically arranged support frame and a vertical slide rail which are fixedly arranged on the support plate, a direction adjusting disc which is horizontally arranged on the support frame through a rotating shaft body, an extension rod which is fixedly arranged on the support frame and is vertically arranged on the rotating shaft body, a driving block which is vertically arranged on the vertical slide rail through a vertical slide channel, and a driving assembly which is fixedly arranged on the support plate and is connected to the output end of the driving block to drive the driving block to move up and down continuously.

[0018] The other side of the direction adjusting disc is provided with a connecting rod at the center, the end of the connecting rod is provided with a clamp assembly for fixing the tire, the direction adjusting disc is a regular polygon, the side of the direction adjusting disc facing the extension rod is uniformly provided with a plurality of circular positioning holes which are consistent with the number of sides of the regular polygon, each positioning hole is located on the center line of each side, the outer end of the extension rod is provided with an extension hole which is consistent with the shape of the positioning hole, a telescopic rod is movably arranged in the extension hole, the outer end of the telescopic rod is provided with a conical positioning piece, the outer wall of the telescopic rod is further fixedly provided with a positioning ring, a positioning spring is arranged on the telescopic rod, the two ends of the positioning spring are fixedly arranged on the positioning ring and the outer end of the extension rod, and the telescopic rod is located on the path through which the positioning hole rotates with the direction adjusting disc, when the positioning hole and the telescopic rod are partially overlapped and aligned, the positioning spring applies pressure to the telescopic rod to gradually embed the positioning piece in the positioning hole under the action of the conical surface, and the telescopic rod is completely overlapped and aligned with the positioning hole when the positioning piece is completely embedded in the positioning hole.

[0019] The top end of the driving block is provided with an exposed hole on the side facing the direction adjusting disc, and an extrusion element is arranged in the exposed hole, the extrusion element contacts the corner formed by the two adjacent sides of the direction adjusting disc during the lifting process of the driving block, the extrusion element extrudes the corner and lifts upward, and the direction adjusting disc is deflected around the rotating shaft body, and the telescopic rod is partially overlapped and aligned with another positioning hole to embed the conical surface of the positioning piece in the positioning hole when the extrusion element is lifted to the topmost position.

[0020] In the above-mentioned method for manufacturing a pressure-resistant bicycle tire, the drive block has a central hole at its center, the inner end of which communicates with an exposed opening. The output end of the drive assembly passes through the central hole and extends into the exposed opening. An active wedge with a first conical surface at its front end is fixedly mounted on the output end of the drive assembly. During the forward and retraction processes of the active wedge, it contacts the front and rear walls of the exposed opening of the drive block to drive the drive block to move synchronously. A passive wedge with a second conical surface is laterally movable in the exposed opening. A pressing element is fixed beside the passive wedge. The first and second conical surfaces have the same properties and are mutually compatible. Alignment: The top and bottom of the exposed opening of the drive block are fixed with return blocks. A return spring is provided between the return block and the passive wedge. The return spring causes the passive wedge to spring back to the innermost end and be in a retracted state when there is no external force. At this time, the pressing element is retracted inside the exposed opening. When the passive wedge is in the retracted state, the first and second cone surfaces are offset from each other. There is frictional resistance between the vertical slide rail and the vertical slide of the drive block. This frictional resistance causes the active wedge to be pushed forward by the output end of the drive assembly, which preferentially passes through the pressing action of the first and second cone surfaces to make the passive wedge pop out laterally and make the pressing element pop out of the exposed opening.

[0021] In the above-mentioned method for manufacturing a pressure-resistant bicycle tire, the drive component is a hydraulic cylinder or an oil cylinder.

[0022] A pressure-resistant bicycle tire prepared by a detection and steering device, characterized in that its maximum load-bearing capacity is 150 kg or more.

[0023] Compared with existing technologies, this manufacturing process can automatically complete the tire rotation and pressure resistance testing processes, with a high degree of automation and producing tires with good strength. Attached Figure Description

[0024] Figure 1 This is a simplified schematic diagram of the first structural principle of the detection and orientation device;

[0025] Figure 2 This is a simplified schematic diagram of the second structure of the direction-adjusting detection device;

[0026] Figure 3 This is a simplified schematic diagram of the third structure of the direction-adjusting detection device;

[0027] Figure 4 This is a simplified schematic diagram of the fourth structure of the direction-adjusting detection device;

[0028] Figure 5 This is a simplified schematic diagram of the internal structure of the further improved driver block;

[0029] Figure 6 This is a simplified schematic diagram of the cross-sectional structure of the further improved drive block;

[0030] In the diagram, 1. Support plate; 2. Vertical frame; 3. Vertical slide rail; 4. Rotary shaft; 5. Steering wheel; 6. Extension rod; 7. Drive block; 8. Drive assembly; 9. Connecting rod; 10. Positioning hole; 11. Telescopic rod; 12. Positioning component; 13. Positioning ring; 14. Positioning spring; 15. Exposed opening; 16. Pressing element; 17. Folded edge; 18. First conical surface; 19. Active wedge block; 20. Second conical surface; 21. Passive wedge block; 22. Return block; 23. Return spring. Detailed Implementation

[0031] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0032] A pressure-resistant bicycle tire and its manufacturing method, characterized by comprising the following steps:

[0033] Step 1: Select the raw materials for rubber mixing, use an internal rubber mixer to mix and pressurize, raise the temperature to 90-100℃, continue for 6-8 minutes to fuse and mix, and then use an open mill to press and cool into rubber sheets.

[0034] Step 2: Put the film into the open mill and roll it, then put it into the tread extruder, raise the temperature to 80-85℃, and then cut it into tread.

[0035] Step 3: Steel wire extrusion molding. The steel wires are extruded, coated with adhesive, and wound together to form a ring of a fixed size;

[0036] Step 4: Lay the cord flat and tighten it before putting it into the four-roll calender. Preheat and roll the rubber through the open mill and raise the temperature to 80-90°C. Then roll it out and put it into the calender.

[0037] Step 5: Cross-wrap the cut fabric around the forming machine head, hang steel wire rings at both ends, wrap the reverse edges of the two layers of fabric around the steel wire rings, tighten them, and then glue the tread onto the fabric. 360-degree joint, press head, and roll to form a fixed embryo.

[0038] Step 6: Use a tire filling machine to expand the tire blank to form the arc required for tire vulcanization. Then put the tire into a high-temperature vulcanizing machine and vulcanize it at a high temperature of over 130°C for 30 to 60 minutes. Press the outer tread pattern of the tire using a mold. After vulcanization is complete, remove the tire to obtain the finished tire.

[0039] Step 7: Place the finished tire on a temporary support and put it into the pressure testing device. Divide the tire circumference into multiple arcs with an angle of 45-60°. Then, use the pressure testing device to perform a compression test on the first arc. Then, use the detection and adjustment device to switch the tire angle and switch the subsequent arcs to the testing position. When all arcs pass the pressure resistance test, remove the temporary support. The tire is a qualified tire in terms of pressure resistance.

[0040] like Figures 1-4 As shown, the bicycle tire pressure-resistant tire detection and steering device includes a fixed support plate 1, a vertical frame 2 and a vertical slide rail 3 that are staggered and fixed on the support plate 1, a steering wheel 5 that is horizontally rotated on the vertical frame 2 via a rotating shaft 4, an extension rod 6 that is horizontally fixed on the vertical frame 2 and staggered vertically from the rotating shaft 4, a drive block 7 that has a vertical slide track and is vertically raised and lowered on the vertical slide rail 3, and a drive assembly 8 that is fixed on the support plate 1 and has its output end connected to the drive block 7 to realize continuous back-and-forth raising and lowering motion of the drive block 7.

[0041] A connecting rod 9 is located at the center of the side of the steering wheel 5 facing away from the pivot shaft 4. The end of the connecting rod 9 is equipped with a clamping assembly for fixing the tire. The steering wheel 5 is a regular polygon. Circular positioning holes 10, the same number as the sides of the regular polygon, are evenly distributed around the circumference of the side of the steering wheel 5 facing the extension rod 6. Each positioning hole 10 is located on the center line of each side. A telescopic hole, matching the shape of the positioning hole 10, is opened at the center of the outer end face of the extension rod 6. A telescopic rod 11 is movably mounted within the telescopic hole. A conical positioning element 12 is provided on the outer end face of the telescopic rod 11. The outer wall of the telescopic rod 11 also... A positioning ring 13 is fixedly provided, and a positioning spring 14 is sleeved on the telescopic rod 11. The two ends of the positioning spring 14 are respectively fixed to the outer end face of the positioning ring 13 and the extension rod 6. The telescopic rod 11 is located on the path that the positioning hole 10 passes through as the steering wheel 5 rotates. When any positioning hole 10 and the telescopic rod 11 partially overlap and align, the positioning spring 14 will apply pressure to the telescopic rod 11 so that the positioning part 12 gradually embeds into the positioning hole 10 under the action of the conical surface. When the positioning part 12 is completely embedded in the positioning hole 10, the telescopic rod 11 and the positioning hole 10 completely overlap and align.

[0042] The top end of the drive block 7 has an exposed opening 15 facing the steering wheel 5. An extrusion element 16 is provided in the exposed opening 15. As the drive block 7 is raised, the extrusion element 16 will contact the bend edges 17 formed by the two adjacent sides of the steering wheel 5. As the extrusion element 16 presses against the bend edges 17 and is raised upward, it will cause the steering wheel 5 to sway around its pivot body 4. When the extrusion element 16 is raised to the top position, the telescopic rod 11 will partially overlap and align with another positioning hole 10 so that the conical surface of the positioning member 12 is embedded in the positioning hole 10.

[0043] The function of the clamping assembly in this invention is to hold the tire. The tire is fixed to the rim, so the clamping assembly only needs to hold the rim. The clamping mechanism for fixing and holding the rim is a mature technology in the prior art. There are many ways to implement such clamps, so this invention will not describe the clamping assembly in detail.

[0044] Generally, the pressure testing device is located at the center of the bottom of the tire. After the tire is clamped, the bottom of the tire can be immediately subjected to a compression test. Once the test is passed, the detection and adjustment device mentioned in this invention needs to be activated. The detection and adjustment device will automatically adjust the tire angle at intervals. Each time the tire angle is adjusted, the pressure testing device will perform a corresponding test.

[0045] The operation process of the pressure detection device is as follows:

[0046] like Figures 1-4 As shown, the horizontal cross-section of the steering wheel 5 in the figure is a regular octagon. Therefore, the effective judgment angle range of the pressure detection device for each pressure strength test is 45°. That is to say, the steering wheel 5 rotates 8 times, each time by 45°. Then, in conjunction with the pressure detection device, a full-range test of a tire can be completed.

[0047] like Figure 1 As shown, under the action of the drive assembly 8, the drive block 7 performs a continuous back-and-forth lifting motion. After the drive block 7 is raised to a sufficiently high height, the pressing element 16 will contact the corner edge 17, as... Figure 3 As shown, the steering wheel 5 then rotates around the pivot 4 under the pressure. During this process, because the conical surface of the positioning element 12 is an arc, it does not provide a forced restraint effect. Therefore, under the action of external force (the external force refers to the pressure force given to the steering wheel 5 by the pressure element 16), the positioning element 12 will disengage from the original positioning hole 10. Then, the pressure element 16 continues to lift and press the bend edge 17 to rotate the steering wheel 5. At this time, the positioning spring 14 is in a compressed state and has elastic potential energy to pop outwards. Figure 2As shown, when the extrusion element 16 is raised to its highest point, the other positioning hole 10 is already partially overlapped and aligned with the positioning element 12. Next, the extrusion element 16 will reduce its unloading force (unloading refers to the extrusion element 16 releasing the extrusion force on the steering wheel 5). Under the elastic tendency of the positioning spring 14, the conical surface of the positioning element 12 will gradually embed into the positioning hole 10 until the telescopic rod 11 is completely overlapped and aligned with the positioning hole 10. This automatically completes the positioning function, achieving a completely accurate angle adjustment function from 0° to 45°. Of course, during the descent, the extrusion element 16 will stick to the side of the steering wheel 5, creating a jamming phenomenon that prevents the positioning element 12 from fully embedding into the positioning hole 10. Only after the extrusion element 16 completely leaves the side of the steering wheel 5 will the positioning element 12 be fully embedded into the positioning hole 10. Then, the extrusion element 16 continues to descend to its lowest position and then rises again. This process allows sufficient time for the pressure detection device to complete its detection function. The extrusion element 16 then rises again to its lowest position. Figure 3 Then, repeat the movement, this time adjusting from 45° to 90°, and repeat this process until it has rotated 360°. After this, the tire has completed the comprehensive pressure strength test.

[0048] The extrusion element 16 is always located outside the exposed opening 15. As mentioned in the above technical means, this will cause the extrusion element 16 to interfere with the positioning function of the positioning member 12 in the positioning hole 10 during the retraction process of lowering. Therefore, the positioning member 12 will only be positioned with the positioning hole 10 after the extrusion element 16 is completely separated from the side of the steering wheel 5. This means that the positioning process is not instantaneous. It also takes a certain amount of time for the extrusion element 16 to descend and separate from the side of the steering wheel 5. During this time, the pressure detection device cannot directly apply pressure to detect the tire that has not been positioned, so the time is completely wasted.

[0049] If the design is further optimized, the extrusion element 16 can be exposed outside the opening 15 during the lifting process to achieve its extrusion function, and retracted inside the opening 15 during the lowering process. Figure 4 When the device descends immediately from its highest position, it will instantly retract into the exposed opening 15. In this way, the extrusion element 16 will no longer stick to the side of the steering wheel 5, causing extrusion interference. The positioning element 12 and the positioning hole 10 will also immediately complete their positioning function. The pressure detection device can then immediately connect and complete its detection function, which will result in better efficiency in terms of time.

[0050] In response, the present invention also provides further optimized design schemes for the extrusion element 16 and the drive block 7:

[0051] like Figure 5 and Figure 6As shown, a central hole is provided in the center of the drive block 7, and the inner end of the central hole communicates with the external opening 15. The output end of the drive assembly 8 passes through the central hole and extends into the external opening 15. An active wedge 19 with a first conical surface 18 at its front end is fixedly provided at the output end of the drive assembly 8. During the forward pushing and retraction of the active wedge 19, it contacts the front and rear walls of the external opening 15 of the drive block 7 to drive the synchronous movement of the drive block 7. A passive wedge 21 with a second conical surface 20 is laterally movable in the external opening 15. The pressing element 16 is fixed to the side of the passive wedge 21. The first conical surface 18 and the second conical surface 20 have the same properties and are aligned with each other. The top of the external opening 15 of the drive block 7... A return block 22 is fixed at the bottom, and a return spring 23 is provided between the return block 22 and the passive wedge 21. The return spring 23 causes the passive wedge 21 to spring back to the innermost end and be in a retracted state when it is not subjected to external force. At this time, the pressing element 16 is retracted in the exposed opening 15. When the passive wedge 21 is in the retracted state, the first cone surface 18 and the second cone surface 20 are offset from each other. There is frictional resistance between the vertical slide rail 3 and the vertical slide of the drive block 7. This frictional resistance causes the active wedge 19 to be pushed forward by the output end of the drive assembly 8, which preferentially passes through the pressing action of the first cone surface 18 and the second cone surface 20 to make the passive wedge 21 pop out laterally and make the pressing element 16 pop out of the exposed opening 15.

[0052] During the lifting of the drive block 7, the pressing element 16 needs to be exposed from the side of the exposed opening 15. Therefore, when the output end of the drive assembly 8 rises, the active wedge 19 will cause the passive wedge 21 to move laterally through the pressing action of the first conical surface 18 and the second conical surface 20. At this time, the pressing element 16 will be exposed outside the exposed opening 15. Of course, the premise that the active wedge 19 can squeeze the passive wedge 21 is that the friction between the vertical slide rail 3 and the vertical slide rail must be large enough to ensure that the active wedge 19 pushes the passive wedge 21 away first and then moves the drive block 7 upward. When the drive block 7 is descending, the output end of the drive assembly 8 moves down so that the active wedge 19 no longer squeezes the passive wedge 21 (again, the friction between the vertical slide rail 3 and the vertical slide rail is used to complete this relative withdrawal). After losing external force, the passive wedge 21 will be pushed back to the retracted state under the action of the return spring 23. In this way, the pressing element 16 will also immediately retract back into the exposed opening 15.

[0053] The drive assembly 8 typically uses a hydraulic cylinder or oil cylinder. The output end refers to the end of the piston rod of the hydraulic cylinder or oil cylinder.

[0054] The pressure-resistant bicycle tires prepared by testing the steering device can have a maximum load capacity of over 150 kg.

[0055] It should be understood that in the claims and description of this invention, all instances of "comprising..." should be understood as having an open meaning, that is, their meaning is equivalent to "containing at least...", and should not be understood as having a closed meaning, that is, their meaning should not be understood as "containing only...".

[0056] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A method for producing a pressure-resistant tire for a bicycle, characterized by, It comprises the following steps: Step 1: select the rubber mixing raw materials, use the rubber mixing machine, mix and press, and raise the temperature to 90-100℃, and continue for 6-8 minutes for fusion and mixing, and then cool the rubber sheet through the open mill; Step 2: put the rubber sheet into the open mill and then into the tread extruder, raise the temperature to 80-85℃, and then cut into the tread; Step 3: extrude the steel wire into a fixed size circle; Step 4: flatten and tighten the cord into a four-roll calender, preheat and roll the rubber through the open mill, and raise the temperature to 80-90℃, and then wind it into the calender; Step 5: cross the cut cloth on the forming machine head, hang the steel wire ring at both ends, cover the steel wire ring with the opposite edges of the two layers of cloth, tighten, and then bond the tread to the cloth at the 360° joint, press the head, and roll to form a fixed embryo; Step 6: use the tire building machine to inflate the tire embryo to form the required curvature for vulcanization, and then put the tire into the high-temperature vulcanizing machine, vulcanize at a temperature above 130℃ for 30-60 minutes, and then press the outer ring pattern of the tire through the mold, take out the tire after vulcanization, and obtain the finished tire; Step 7: place the finished tire on a temporary support and put it into the pressure detection device, evenly divide the tire circumference into multiple arcs, with an included angle of 45-60°, then test the first arc through the pressure detection device, switch the angle of the tire through the detection and switching device, switch the subsequent arcs to the detection position, and when all the arcs pass the compression strength test, remove the temporary support, and the tire is a compression strength qualified tire; The detection and switching device and the pressure detection device involved in the preparation process are specially applied to a pressure detection equipment for verifying whether the compression strength of the tire meets the standard, the pressure detection equipment is composed of the detection and switching device and the pressure detection device, the pressure detection device is used for detecting the compression strength of the tire, the detection and switching device is used for fixing and rotating to adjust the angle position of the tire, the pressure detection device has a detection station, the detection and switching device adjusts the fixed tire by the same angle multiple times, and the part of the tire located in the detection station is tested and verified through the pressure detection device every time the angle is adjusted; The detection and switching device comprises a fixed support plate, a vertical frame and a vertical slide rail vertically fixed on the support plate, a switching disc horizontally and transversely arranged on the vertical frame through a rotating shaft body, an extension rod horizontally and transversely fixed on the vertical frame and vertically arranged above and below the rotating shaft body, a driving block vertically and transversely arranged on the vertical slide rail through a vertical slide, and a driving assembly fixed on the support plate and having an output end connected to the driving block to drive the driving block to move up and down continuously. The other side of the steering disc is provided with a connecting rod at the center of the body of the rotating shaft, and the end of the connecting rod is provided with a clamp assembly for fixing the tire. The steering disc is a regular polygon, and the side of the steering disc facing the extension rod is uniformly provided with a plurality of circular positioning holes consistent with the number of edges of the regular polygon. Each positioning hole is located on the center line of each edge. The outer end face of the extension rod is provided with an expansion hole consistent with the shape of the positioning hole. The expansion rod is movably arranged in the expansion hole. The outer end face of the expansion rod is provided with a conical positioning member. The outer wall of the expansion rod is further fixedly provided with a positioning ring. A positioning spring is arranged on the expansion rod. The two ends of the positioning spring are fixed on the positioning ring and the outer end face of the extension rod, respectively. The expansion rod is located on the path through which the positioning hole rotates with the steering disc. When any positioning hole is partially overlapped with the expansion rod, the positioning spring will exert pressure on the expansion rod to gradually embed the positioning member into the positioning hole under the action of the conical surface. When the positioning member is completely embedded in the positioning hole, the expansion rod is completely overlapped with the positioning hole. The top end of the driving block is provided with an exposed hole on the side facing the steering disc. The exposed hole is provided with a pressing element. The pressing element will contact the folding angle formed by the two adjacent sides of the steering disc during the lifting process of the driving block. The pressing element will press the folding angle and lift upward, and the steering disc will be deflected around the rotating shaft body. When the pressing element is lifted to the topmost position, the expansion rod will be partially overlapped with another positioning hole to embed the conical surface of the positioning member into the positioning hole.

2. A process for the preparation of a pressure-resistant bicycle tire according to claim 1, characterized in that: The center of the driving block is provided with a center hole. The inner end of the center hole is in communication with the exposed hole. The output end of the driving assembly extends into the exposed hole through the center hole. The output end of the driving assembly is fixedly provided with a driving block with a first tapered surface at the front end. The driving block is driven to move synchronously by contacting the front and rear walls of the exposed hole of the driving block during the forward and backward movement of the driving block. A passive block with a second tapered surface is movably arranged in the exposed hole. The pressing element is fixed beside the passive block. The first tapered surface and the second tapered surface have the same properties and are aligned with each other. The top and bottom of the exposed hole of the driving block are fixedly provided with a homing block. A homing spring is arranged between the homing block and the passive block. The homing spring makes the passive block return to the retracted state at the innermost end when it is not subjected to external force, and at this time the pressing element is retracted in the exposed hole. When the passive block is in the retracted state, the first tapered surface and the second tapered surface are offset from each other. The vertical sliding rail and the vertical sliding channel of the driving block have a frictional resistance. The frictional resistance makes the passive block pop out laterally and the pressing element pop out to the outside of the exposed hole under the extrusion action of the first tapered surface and the second tapered surface when the output end of the driving assembly is pushed forward.

3. A process for the preparation of a pressure-resistant bicycle tire according to claim 1, characterized in that: The driving assembly is a hydraulic cylinder or an oil cylinder.

4. Bicycle pressure-resistant tyre, obtained by the process according to claim 1, characterised in that: The maximum load capacity is more than 150 kg.

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