Pneumatic mechanical internal inflation mechanism

Abstract

The present application relates to the field of supporting the expanding shaft, in particular to a kind of air pressure mechanical inner expanding mechanism, including fixed shaft, inclined plane axle and rotating shaft, the surface of rotating shaft is all set with through hole around, each through hole is equipped with a steel ball, the surface of inclined plane axle is set with the inclined plane ring groove that is engaged with steel ball around a week at the position corresponding steel ball, the position of rotating shaft around corresponding each steel ball is also equipped with an arc surface heat conduction sheet, rotating shaft is coaxially equipped with rubber expansion sleeve, rotating shaft is equipped with elastic recovery component around, the end of rubber expansion sleeve towards fixed shaft is equipped with coaxial limiting component, the present application is supported fixed tube core by rubber expansion sleeve, and by keeping the coaxial state between tube core and rotating shaft by coaxial limiting component, so that rubber expansion sleeve is kept stable when being processed, in order to restore the elasticity of rubber expansion sleeve, by elastic recovery component to improve the heat of rubber expansion sleeve, so that rubber expansion sleeve restores elasticity, improves the processing effect of tube core.

Description

Technical Field

[0001] This invention relates to the field of support expansion shafts, and more specifically to a pneumatic mechanical internal expansion mechanism. Background Technology

[0002] The existing technology uses air pressure to push a connecting rod to clamp the tube core. This mechanism uses steel mechanical parts for clamping. If the pressure is too high, the tube core is easily crushed or cracked. If the pressure is too low, the tube core cannot be clamped. The thickness of the tube core wall also makes adjustment very difficult. There are too many factors that are unstable and affect the clamping force.

[0003] The currently disclosed Chinese patent CN219852192U discloses a pneumatic internal support tooling, including a shell and an internal support mechanism. The internal support mechanism is located on the top surface of the shell, and the outer wall of the internal support mechanism abuts against the inner wall of the workpiece. An air pipe is connected to the outer surface of the shell. The internal support mechanism includes a first internal support block and a second internal support block. A movable internal support cylinder is fixedly connected to the bottom surface of the first internal support block. The movable internal support cylinder is disposed in a movable groove, which is disposed in a fixed internal support cylinder. The fixed internal support cylinder communicates with the interior of the shell. The lower end of the fixed internal support cylinder is fixedly connected to the second internal support block, which is fixedly connected to the top surface of the shell. The first and second internal support blocks communicate with the fixed internal support cylinder. Movable pneumatic mechanisms are fixedly connected to the four sides of the first and second internal support blocks, and each movable pneumatic mechanism communicates with the fixed internal support cylinder. An air release valve is provided at the upper end of the first internal support block.

[0004] According to the aforementioned patent, the patent uses a rubber pad to compress the inner wall of the workpiece. However, in actual use, due to the elastic properties of rubber, there may still be micro-movement of the workpiece. This is because the elasticity of rubber may cause the rubber to undergo slight deformation and displacement when the workpiece is subjected to external force or vibration, thus causing micro-movement of the workpiece. Therefore, there is a need for an internal expansion mechanism that can prevent micro-movement of the workpiece and restore the elasticity of the rubber. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a pneumatic mechanical internal expansion mechanism. The invention fixes the core tube by internal support of a rubber expansion sleeve and keeps the core tube and the rotating shaft in a coaxial state by a coaxial limiting component, so that the rubber expansion sleeve remains stable during processing. In order to restore the elasticity of the rubber expansion sleeve, the elasticity restoration component increases the heat to the rubber expansion sleeve, so that the rubber expansion sleeve restores its elasticity and improves the processing effect of the core tube.

[0006] To address the problems of existing technologies, this invention provides a pneumatic mechanical internal expansion mechanism, comprising a fixed shaft, an inclined shaft, and a rotating shaft. The inclined shaft is coaxially connected to the fixed shaft and can move relative to the fixed shaft along its axial direction. The rotating shaft is coaxially sleeved on the inclined shaft and can rotate relative to the inclined shaft around its axis. The end of the rotating shaft is rotatably connected to the end of the fixed shaft. Through holes perpendicular to its axial direction are formed around the surface of the rotating shaft, and a steel ball is disposed in each through hole. A ring is positioned around the surface of the inclined shaft corresponding to the position of the steel ball. The rotating shaft has a beveled annular groove that fits with the steel ball. Around the rotating shaft, at the position of each steel ball, there is also an arc-shaped heat-conducting plate that works in conjunction with it to support the core. A rubber expansion sleeve with its inner surface in contact with the outer surface of the arc-shaped heat-conducting plate is coaxially fitted on the rotating shaft. An elastic recovery component that contacts the inner surface of the arc-shaped heat-conducting plate is also arranged around the rotating shaft. The elastic recovery component is located between the steel ball and the arc-shaped heat-conducting plate. At the end of the rubber expansion sleeve facing the fixed shaft, there is a coaxial limiting component to prevent the core from moving slightly. The coaxial limiting component is connected to the rubber expansion sleeve.

[0007] Preferably, the elastic recovery component is provided with a water tank, which has a hollow cylindrical structure. Both ends of the water tank are threadedly connected to the rotating shaft with sealing rings. A water inlet is opened at the end of the water tank away from the fixed shaft. A water channel communicating with the water inlet is opened on the rotating shaft. When the steel ball does not push out the arc-shaped heat-conducting sheet, the inner surface of the arc-shaped heat-conducting sheet is in contact with the surface of the water tank.

[0008] Preferably, the coaxial limiting assembly is provided with limiting rods, and there are four limiting rods. The four limiting rods are evenly distributed around the rotating shaft. The axial direction of the limiting rods is parallel to the axial direction of the rotating shaft. The end of the rubber expansion sleeve is provided with a slot for supporting the limiting rods. Each limiting rod is provided with a linkage component that moves with it. The surface of the rotating shaft is provided with a deep hole perpendicular to its axial direction for the linkage component to move. The end of the rotating shaft near the fixed shaft is also provided with a locking component for fixing the linkage component.

[0009] Preferably, a spiral heating tube is provided in the water tank and along its axial direction, surrounding the inner wall of the water tank.

[0010] Preferably, a guide channel coaxial with the through hole is provided at the position corresponding to the steel ball on the water tank. The inner diameter of the guide channel is equal to the diameter of the steel ball. An elastic connector located in the guide channel is provided between the steel ball and the arc-shaped heat-conducting sheet.

[0011] Preferably, the elastic connector is provided with a first compression spring and a push rod, and an annular step is fixedly provided in the middle of the guide channel. The first compression spring is fixedly connected between the annular step and the arc-shaped heat-conducting plate. The push rod is inserted in the annular step, and the diameter of the push rod is equal to the inner diameter of the annular step. The two ends of the push rod abut against the surface of the steel ball and the surface of the arc-shaped heat-conducting plate, respectively.

[0012] Preferably, the end of the limiting rod facing the arc-shaped heat-conducting sheet has a coaxially extending insert rod. The end of the insert rod extends beyond the end of the arc-shaped heat-conducting sheet and is located in the rubber expansion sleeve. The rubber expansion sleeve has a socket for inserting the insert rod. The surface of the limiting rod is also provided with a patch-type pressure sensor. When the rubber expansion sleeve is in a normal state, the surface of the limiting rod is in a state lower than the surface of the rubber expansion sleeve.

[0013] Preferably, the linkage is provided with a guide rod and a sliding sleeve. The guide rod is coaxially inserted into the deep hole, and the end of the guide rod is fixedly connected to the deep hole. The diameter of the guide rod is smaller than the diameter of the deep hole. The sliding sleeve is slidably sleeved on the guide rod. The outer diameter of the sliding sleeve is equal to the diameter of the deep hole. A second compression spring sleeved on the guide rod is fixedly connected between the sliding sleeve and the rotating shaft. The locking member is connected to the sliding sleeve.

[0014] Preferably, the locking member is provided with a sleeve, and the surface of the sliding sleeve is provided with an annular clamp for the sleeve to engage. An extension plate extends from the sleeve toward the fixed shaft. A columnar electromagnet is fixedly provided on the surface of the rotating shaft, passing vertically through the middle of the extension plate. A first ring is fixedly provided on the extension plate at the position corresponding to the columnar electromagnet, and the first ring is made of magnetic material.

[0015] Preferably, a pressurized air pipe is fixedly provided on the surface of the rotating shaft, passing vertically through the extension plate and located near the end of the fixed shaft. A second ring is fixedly provided on the extension plate at the position corresponding to the pressurized air pipe, and the second ring is made of rubber. A pressurized air port is provided on the rotating shaft and located between the pressurized air pipe and the deep hole, which is used to push the sliding sleeve to move twice by air pressure.

[0016] The advantages of this application compared to the prior art are:

[0017] 1. This invention uses a rubber expansion sleeve to fix the core and a coaxial limiting component to keep the core and rotating shaft coaxial. This ensures the rubber expansion sleeve remains stable during processing. After the rubber expansion sleeve releases its internal support from the core, an elasticity recovery component provides heat to the rubber expansion sleeve to restore its elasticity. Based on the principle of thermal expansion and contraction, the rubber expansion sleeve regains its elasticity, thus achieving stable support for the core and improving the processing effect of the core.

[0018] 2. This invention uses an arc-shaped heat-conducting sheet to transfer heat from the water tank to the rubber expansion sleeve. Due to the effect of thermal expansion and contraction, the rubber expansion sleeve can recover its normal elasticity after being excessively compressed, thus achieving stable fixation of the tube core by the rubber expansion sleeve, avoiding slippage of the tube core on the rubber expansion sleeve, and improving the service life of the rubber expansion sleeve.

[0019] 3. This invention uses four limiting rods that move in sync with the internal expansion state of the rubber sleeve, thereby bringing the limiting rods into contact with the inner wall of the core. The limiting rods only limit the position of the core and do not provide internal support, thus avoiding deformation of the core caused by rigid support. This ensures that the core is fixed in position on the rubber sleeve, achieving the limitation of the core and preventing micro-movement of the core on the rubber sleeve, thereby improving the stability of the core during processing. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of a pneumatic mechanical internal expansion mechanism.

[0021] Figure 2 This is a partial three-dimensional structural cross-sectional view of a pneumatic mechanical internal expansion mechanism.

[0022] Figure 3 This is a planar sectional view of a pneumatic mechanical internal expansion mechanism.

[0023] Figure 4 yes Figure 3 Enlarged diagram of point A.

[0024] Figure 5 yes Figure 3 Enlarged diagram of point B.

[0025] Figure 6 This is a planar sectional view of the elastic recovery component and coaxial limiting component of a pneumatic mechanical internal expansion mechanism.

[0026] Figure 7 yes Figure 6 A three-dimensional structural cross-sectional view at point CC.

[0027] Figure 8 yes Figure 6 A three-dimensional sectional view of the DD section.

[0028] Figure 9 This is a three-dimensional structural diagram of a coaxial limiting component of a pneumatic mechanical internal expansion mechanism.

[0029] Figure 10 yes Figure 3 Enlarged diagram of point E.

[0030] The diagram is labeled as follows: 1-Fixed shaft; 11-Guide post; 111-Piston; 112-Return spring; 12-Air passage; 2-Sloping shaft; 21-Sloping annular groove; 3-Rotating shaft; 31-Through hole; 311-Steel ball; 32-Water passage; 33-Deep hole; 331-Pressurized air port; 4-Arc-shaped heat-conducting plate; 5-Rubber expansion sleeve; 6-Elastic recovery component; 61-Water tank; 611-Sealing ring; 612-Water inlet; 613-Guide channel; 6131-Annular step; 62-Spiral heating tube; 6 3-Elastic connector; 631-First compression spring; 632-Top rod; 7-Coaxial limiting assembly; 71-Limiting rod; 711-Insertion rod; 712-Pressure sensor; 72-Linking component; 721-Guide rod; 722-Sliding sleeve; 7221-Annular clamp; 723-Second compression spring; 73-Locking component; 731-Clip sleeve; 7311-Extension plate; 732-Columnar electromagnet; 7321-First collar; 733-Pressurized air pipe; 7331-Second collar; 8-Core tube. Detailed Implementation

[0031] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0032] See Figures 1-6 As shown, a pneumatic mechanical internal expansion mechanism includes a fixed shaft 1, an inclined shaft 2, and a rotating shaft 3. The inclined shaft 2 is coaxially connected to the fixed shaft 1 and can move relative to the fixed shaft 1 along its axial direction. The rotating shaft 3 is coaxially sleeved on the inclined shaft 2 and can rotate relative to the inclined shaft 2 around its axis. The end of the rotating shaft 3 is rotatably connected to the end of the fixed shaft 1. Through holes 31 perpendicular to its axial direction are formed around the surface of the rotating shaft 3, and a steel ball 311 is provided in each through hole 31. Corresponding to the position of the steel ball 311, the surface of the inclined shaft 2 has a ring around its circumference. The inclined annular groove 21 of 311 fits, and around the rotating shaft 3, corresponding to the position of each steel ball 311, there is also an arc-shaped heat-conducting plate 4 that works in conjunction with it to support the core 8. A rubber expansion sleeve 5 is coaxially sleeved on the rotating shaft 3, the inner surface of which abuts against the outer surface of the arc-shaped heat-conducting plate 4. An elastic recovery component 6 that contacts the inner surface of the arc-shaped heat-conducting plate 4 is also arranged around the rotating shaft 3. The elastic recovery component 6 is arranged between the steel ball 311 and the arc-shaped heat-conducting plate 4. The end of the rubber expansion sleeve 5 facing the fixed shaft 1 is provided with a coaxial limiting component 7 to prevent the core 8 from moving slightly. The coaxial limiting component 7 is connected to the rubber expansion sleeve 5.

[0033] A guide post 11 is fixedly provided at the end of the fixed shaft 1 facing the inclined shaft 2. A piston 111 is slidably sleeved on the guide post 11. A return spring 112 sleeved on the guide post 11 is fixedly connected between the piston 111 and the guide post 11. The end of the piston 111 contacts the end of the inclined shaft 2. A communicating air passage 12 is opened between the fixed shaft 1 and the guide post 11.

[0034] After the core 8 is fitted onto the rotating shaft 3, air is supplied through the air passage 12 to push the piston 111, causing the piston 111 to move towards the inclined shaft 2, thereby pushing the inclined shaft 2 to move as well. When the inclined shaft 2 moves, the steel ball 311 is pushed by the inclined annular groove 21, thus causing the steel ball 311 to be gradually pushed out of the through hole 31. At this time, the arc-shaped heat-conducting plate 4 is pushed outward accordingly. Since the arc-shaped heat-conducting plate 4 cooperates with the steel ball 311 and the rubber expansion sleeve 5, it plays the role of internally supporting the core 8. When the heating element 4 moves outward, it expands the rubber sleeve 5 outward, causing the rubber sleeve 5 to deform. The rubber sleeve 5 then presses against the inner wall of the core 8, thus fixing the core 8. When the rotating shaft 3 rotates, the core 8 rotates together. However, during the processing of the core 8, due to the elastic properties of the rubber sleeve 5, there may still be slight movement of the core 8. This is because the elasticity of the rubber sleeve 5 may cause slight deformation and displacement of the rubber sleeve 5 when the core 8 is subjected to external force or vibration, thus causing slight movement of the core 8. At this time, the coaxial limiting component 7 restricts the core 8, keeping it coaxial with the rotating shaft 3 and supporting it to prevent slight movement. After the core 8 is processed, the coaxial limiting component 7 releases its support, the air passage 12 is depressurized, and the piston 111 returns to its original position under the action of the return spring 112. The inclined shaft 2 also returns to its original position, the steel ball 311 returns to the through hole 31, the rubber expansion sleeve 5 returns to its normal state, and the core 8 can then be removed. If the inner support core 8 of the rubber expansion sleeve 5 is excessively compressed, the rubber expansion sleeve 5 will become thinner than it originally was. After the inner support of the rubber expansion sleeve 5 is removed and it moves away from the core 8, the rubber expansion sleeve 5 cannot recover its original thickness and thus loses its elastic effect. At this time, through the contact between the elastic recovery component 6 and the arc-shaped heat-conducting plate 4, heat is conducted to the rubber expansion sleeve 5. Heating will provide heat energy to the rubber expansion sleeve 5, which will strengthen the activity of its molecular chains. The molecular chains of the rubber expansion sleeve 5 will rearrange and reorganize due to the effect of heat energy, thereby restoring its original elastic state.

[0035] See Figures 2-7As shown, the elastic recovery component 6 is provided with a water tank 61, which has a hollow cylindrical structure. Both ends of the water tank 61 are threadedly connected to the rotating shaft 3 with sealing rings 611. A water inlet 612 is opened at the end of the water tank 61 away from the fixed shaft 1. A water channel 32 communicating with the water inlet 612 is opened on the rotating shaft 3. When the steel ball 311 does not push out the arc-shaped heat-conducting plate 4, the inner surface of the arc-shaped heat-conducting plate 4 is in a state of contact with the surface of the water tank 61.

[0036] When the steel ball 311 does not push out the arc-shaped heat-conducting plate 4, the inner surface of the arc-shaped heat-conducting plate 4 is in close contact with the surface of the water tank 61. When hot water enters the water tank 61 from the water outlet 612 through the water channel 32, the heat in the hot water is conducted to the arc-shaped heat-conducting plate 4. Since the arc-shaped heat-conducting plate 4 is released from the rubber expansion sleeve 5, the arc-shaped heat-conducting plate 4 then conducts heat to the rubber expansion sleeve 5. According to the principle of thermal expansion and contraction, the rubber expansion sleeve 5 expands and restores its elasticity.

[0037] See Figure 2 , Figure 3 , Figure 5 and Figure 8 As shown, the coaxial limiting assembly 7 is provided with limiting rods 71, linkage members 72, and locking members 73. There are four limiting rods 71, which are evenly distributed around the rotating shaft 3. The axial direction of the limiting rods 71 ​​is parallel to the axial direction of the rotating shaft 3. The end of the rubber expansion sleeve 5 is provided with a slot for supporting the limiting rods 71. There are four linkage members 72, and one linkage member 72 is connected to one limiting rod 71. The surface of the rotating shaft 3 is provided with a deep hole 33 perpendicular to its axial direction for the linkage member 72 to move. There are four locking members 73, and one locking member 73 is connected to one linkage member 72.

[0038] By combining the limiting rod 71, the linkage 72, and the locking member 73, the core 8 can be limited. As the rubber expansion sleeve 5 is expanded, the limiting rod 71 moves outward along with the rubber expansion sleeve 5 until the rubber expansion sleeve 5 presses against the inner wall of the core 8 to a specified degree. Then, the surface of the limiting rod 71 contacts the inner wall of the core 8, and the linkage 72 moves together with the limiting rod 71. After the position of the limiting rod 71 is determined, the locking member 73 fixes the linkage 72, indirectly fixing the limiting rod 71 and restricting its movement. Thus, with the limiting rods 71 ​​limiting the core 8, the core 8 is prevented from making slight movements on the rubber expansion sleeve 5.

[0039] See Figure 2 , Figure 3 and Figure 6 As shown, a spiral heating tube 62 is provided in the water tank 61 and along its axial direction, surrounding the inner wall of the water tank 61.

[0040] When an electric current passes through the spiral heating tube 62, electrical energy is converted into heat energy, thereby heating the liquid medium in the water tank 61. Through the heating effect of the spiral heating tube 62, the liquid or medium in the water tank 61 can reach the required temperature, thereby controlling the degree of heating of the rubber expansion sleeve 5 and ensuring that the rubber expansion sleeve 5 is restored within the required temperature range, thus guaranteeing its restoration effect.

[0041] See Figure 2 , Figure 3 , Figure 4 and Figure 7 As shown, a guide channel 613 coaxial with the through hole 31 is provided on the water tank 61 at the position corresponding to the steel ball 311. The inner diameter of the guide channel 613 is equal to the diameter of the steel ball 311. An elastic connector 63 located in the guide channel 613 is provided between the steel ball 311 and the arc-shaped heat-conducting plate 4.

[0042] The guide channel 613 on the water tank 61 is a channel coaxial with the through hole 31, with an inner diameter equal to the diameter of the steel ball 311, allowing the steel ball 311 to roll and be positioned freely along the guide channel 613. In the guide channel 613, an elastic connector 63 is provided between the steel ball 311 and the arc-shaped heat-conducting plate 4. The function of the elastic connector 63 is to connect and fix the steel ball 311 and the arc-shaped heat-conducting plate 4. As the inclined shaft 2 pushes the steel ball outward, the steel ball will push the arc-shaped heat-conducting plate 4 outward through the elastic connector 63. As the steel ball moves inward, the arc-shaped heat-conducting plate 4 can return to its original position through the elastic connector 63, thereby controlling the deformation of the rubber expansion sleeve 5.

[0043] See Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, the elastic connector 63 is provided with a first compression spring 631 and a push rod 632. An annular step 6131 is fixedly provided in the middle of the guide channel 613. The first compression spring 631 is fixedly connected between the annular step 6131 and the arc-shaped heat-conducting plate 4. The push rod 632 is inserted in the annular step 6131. ​​The diameter of the push rod 632 is equal to the inner diameter of the annular step 6131. ​​The two ends of the push rod 632 abut against the surface of the steel ball 311 and the surface of the arc-shaped heat-conducting plate 4, respectively.

[0044] When the steel ball is ejected, it indirectly ejects the arc-shaped heat-conducting plate 4 through the push rod 632. The arc-shaped heat-conducting plate 4 contacts a quarter of the area of ​​the rubber expansion sleeve 5, increasing the contact area between the rubber expansion sleeve 5 and the inner wall of the tube core 8. As the arc-shaped heat-conducting plate 4 is ejected, the first compression spring 631 changes from its normal state to a stretched state. As the steel ball returns to its original position, the first compression spring 631 returns to its normal state. At this time, the arc-shaped heat-conducting plate 4 is pulled back to its original position, and the rubber expansion sleeve 5 also returns to its normal state, effectively controlling the internal expansion state of the rubber expansion sleeve 5.

[0045] See Figure 3 , Figure 5 , Figure 8 , Figure 9 and Figure 10 As shown, the end of the limiting rod 71 facing the arc-shaped heat-conducting plate 4 has a coaxially extending insertion rod 711. The end of the insertion rod 711 extends beyond the end of the arc-shaped heat-conducting plate 4 and is located in the rubber expansion sleeve 5. The rubber expansion sleeve 5 has an insertion port for the insertion rod 711 to be inserted. The surface of the limiting rod 71 is also provided with a patch-type pressure sensor 712. When the rubber expansion sleeve 5 is in a normal state, the surface of the limiting rod 71 is in a state lower than the surface of the rubber expansion sleeve 5.

[0046] When the rubber expansion sleeve 5 is in its normal state, the surface of the limiting rod 71 is lower than the surface of the rubber expansion sleeve 5. As the rubber expansion sleeve 5 expands to support the core 8, the limiting rod 71 moves along with the expansion of the rubber expansion sleeve 5. To prevent the end of the rubber expansion sleeve 5 from bending at the connection with the rubber rod when the arc-shaped heat-conducting plate 4 pushes the rubber expansion sleeve 5, the insertion rod 711 is used to support the rubber expansion sleeve 5 and the limiting rod 71. This provides support between the limiting rod 71 and the rubber expansion sleeve 5, ensuring that the limiting rod 71 can move stably during the expansion of the rubber expansion sleeve 5. The rubber expansion sleeve 5 is gradually compressed against the inner wall of the core 8 until the pressure sensor 712 on the limiting rod 71 is compressed to a specified degree, at which point the rubber expansion sleeve 5 stops expanding. At this time, the rubber expansion sleeve 5 is in the state of supporting the core 8, and the limiting rod 71 is in contact with the inner wall of the core 8. Through the contact of the four limiting rods 71 ​​with the core 8, the micro-movement of the core 8 is prevented.

[0047] See Figure 3 , Figure 8 , Figure 9 and Figure 10 As shown, the linkage 72 is provided with a guide rod 721 and a sliding sleeve 722. The guide rod 721 is coaxially inserted into the deep hole 33, and the end of the guide rod 721 is fixedly connected to the deep hole 33. The diameter of the guide rod 721 is smaller than the diameter of the deep hole 33. The sliding sleeve 722 is slidably sleeved on the guide rod 721. The outer diameter of the sliding sleeve 722 is equal to the diameter of the deep hole 33. A second compression spring 723 sleeved on the guide rod 721 is fixedly connected between the sliding sleeve 722 and the rotating shaft 3. The locking member 73 is connected to the sliding sleeve 722.

[0048] When the limiting rod 71 moves, it drives the sliding sleeve 722 to move together. The sliding sleeve 722 slides on the guide rod 721. As the limiting rod 71 moves outward, the second compression spring 723 is in a stretched state. As the rubber expansion sleeve 5 returns to its normal state, the second compression spring 723 returns to its normal state, the limiting rod 71 returns to its original position, releases the fixation on the core 8, and effectively controls the movement of the limiting rod 71.

[0049] See Figure 3 , Figure 8 , Figure 9 and Figure 10 As shown, the locking member 73 is provided with a sleeve 731 and a columnar electromagnet 732. The surface of the sliding sleeve 722 is provided with an annular clamping opening 7221. The sleeve 731 is engaged in the annular clamping opening 7221 on the sliding sleeve 722. An extension plate 7311 is provided on the side of the sleeve 731 and extends towards the fixed shaft 1. The columnar electromagnet 732 is fixedly mounted on the rotating shaft 3. The end of the columnar electromagnet 732 extends outward through the middle of the extension plate 7311. A first ring 7321 is fixedly provided on the extension plate 7311 at the position corresponding to the columnar electromagnet 732. The first ring 7321 is made of magnetic material.

[0050] When the limiting rod 71 contacts the inner wall of the core 8 and the rubber expansion sleeve 5 fixes the core 8, the columnar electromagnet 732 is energized. According to the principle of like poles repelling and unlike poles attracting, the magnetic poles of the columnar electromagnet 732 are adjusted to be opposite to the first ring 7321, so that the first ring 7321 is attracted to the columnar electromagnet 732, thereby fixing the extension plate 7311 and the sliding sleeve 722, ensuring stable contact between the limiting rod 71 and the inner wall of the core 8, and effectively preventing micro-movement of the core 8.

[0051] See Figure 10 As shown, a pressurized air pipe 733 is fixedly provided on the surface of the rotating shaft 3, which passes vertically through the extension plate 7311 and is located near the end of the fixed shaft 1. A second collar 7331 is fixedly provided on the extension plate 7311 at the position corresponding to the pressurized air pipe 733, and is sleeved on the pressurized air pipe 733. The second collar 7331 is made of rubber. A pressurized air port 331 is provided on the rotating shaft 3 and located between the pressurized air pipe 733 and the deep hole 33 to push the sliding sleeve 722 to move twice by air pressure.

[0052] When the rubber expansion sleeve 5 supports the core 8 to a suitable extent, but the limiting rod 71 has not yet reached the state of contact with the inner wall of the core 8, air is injected through the pressurizing air pipe 733 and injected into the deep hole 33 through the pressurizing air port 331. With continuous pressurization, the collar will be pushed outward until the limiting rod 71 contacts the inner wall of the core 8, ensuring that the limiting rod 71 effectively limits the core 8 and prevents the core 8 from making slight movements when the pressure of the rubber expansion sleeve 5 against the inner wall of the core 8 is small.

[0053] This invention uses a rubber expansion sleeve 5 to internally support and fix the core 8, and a coaxial limiting component 7 to keep the core 8 and the rotating shaft 3 in a coaxial state, so that the rubber expansion sleeve 5 remains stable during processing. After the rubber expansion sleeve 5 releases its internal support on the core 8, in order to restore the elasticity of the rubber expansion sleeve 5, the elasticity recovery component 6 increases the heat to the rubber expansion sleeve 5. According to the principle of thermal expansion and contraction, the rubber expansion sleeve 5 restores its elasticity and improves the processing effect of the core 8.

[0054] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. A pneumatic mechanical inner expansion mechanism, comprising a fixed shaft (1), an inclined shaft (2) and a rotating shaft (3); the inclined shaft (2) is coaxially connected with the fixed shaft (1), and the inclined shaft (2) can move along the axial direction of the fixed shaft (1); the rotating shaft (3) is coaxially sleeved on the inclined shaft (2), the rotating shaft (3) can rotate around the axis of the inclined shaft (2), the end of the rotating shaft (3) is rotationally connected with the end of the fixed shaft (1), and the surface of the rotating shaft (3) is provided with through holes (31) penetrating around the surface and perpendicular to the axial direction of the rotating shaft (3), each through hole (31) is provided with a steel ball (311), and the surface of the inclined shaft (2) is provided with an inclined groove (21) around the surface and corresponding to the position of the steel ball (311) and matched with the steel ball (311); the rotating shaft (3) is further provided with an arc surface heat conducting sheet (4) corresponding to the position of each steel ball (311) and matched with the arc surface heat conducting sheet (4) for the inner support of the pipe core (8); characterized in that, a rubber expansion sleeve (5) is coaxially sleeved on the rotating shaft (3) and abuts against the inner surface of the arc surface heat conducting sheet (4), the rotating shaft (3) is further provided with an elastic recovery assembly (6) around the surface and in contact with the inner surface of the arc surface heat conducting sheet (4), and the elastic recovery assembly (6) is arranged between the steel ball (311) and the arc surface heat conducting sheet (4); the end of the rubber expansion sleeve (5) facing the fixed shaft (1) is provided with a coaxial limiting assembly (7) for preventing the pipe core (8) from moving slightly, and the coaxial limiting assembly (7) is connected with the rubber expansion sleeve (5).

2. A pneumatic mechanical internal inflation mechanism according to claim 1, characterized in that The elastic recovery assembly (6) is provided with a water tank (61); the water tank (61) has a hollow cylindrical structure, the two ends of the water tank (61) are threadedly connected with sealing rings (611) between the two ends and the rotating shaft (3), the end of the water tank (61) away from the fixed shaft (1) is provided with a water inlet (612), the rotating shaft (3) is provided with a water channel (32) in communication with the water inlet (612), and when the steel ball (311) does not push out the arc surface heat conducting sheet (4), the inner surface of the arc surface heat conducting sheet (4) is in abutment with the surface of the water tank (61).

3. A pneumatic mechanical internal inflation mechanism according to claim 1, characterized in that, The coaxial limiting assembly (7) is provided with a limiting rod (71), a linkage (72) and a locking member (73); the limiting rod (71) has four, the four limiting rods (71) are uniformly distributed around the rotating shaft (3), the axial direction of the limiting rod (71) is parallel to the axial direction of the rotating shaft (3), and the end of the rubber expansion sleeve (5) is provided with a notch for supporting the limiting rod (71); the linkage (72) has four, one linkage (72) is connected with one limiting rod (71), and the surface of the rotating shaft (3) is provided with a deep hole (33) perpendicular to the axial direction of the rotating shaft (3) and for the linkage (72) to move; the locking member (73) has four, one locking member (73) is connected with one linkage (72).

4. A pneumatic mechanical internal inflation mechanism according to claim 2, wherein The water tank (61) is provided with a spiral heating pipe (62) around the inner wall of the water tank (61) along the axial direction of the water tank (61).

5. A pneumatic mechanical internal inflation mechanism according to claim 4, wherein A guide channel (613) coaxial with the through hole (31) is provided through the sump (61) at a position corresponding to the steel ball (311), the inner diameter of the guide channel (613) is equal to the diameter of the steel ball (311), and an elastic connecting piece (63) is arranged between the steel ball (311) and the arc-shaped heat conduction sheet (4) in the guide channel (613).

6. A pneumatic mechanical internal inflation mechanism according to claim 5, wherein, The elastic connecting piece (63) is provided with a first compression spring (631) and a jacking rod (632); A ring-shaped step (6131) is fixedly arranged in the middle of the guide channel (613); The first compression spring (631) is fixedly connected between the ring-shaped step (6131) and the arc-shaped heat conduction sheet (4); The jacking rod (632) is inserted into the ring-shaped step (6131), the diameter of the jacking rod (632) is equal to the inner diameter of the ring-shaped step (6131), and the two ends of the jacking rod (632) abut against the surface of the steel ball (311) and the surface of the arc-shaped heat conduction sheet (4) respectively.

7. A pneumatic mechanical internal tensioning mechanism according to claim 3, characterized in that The end of the limiting rod (71) towards the arc-shaped heat conduction sheet (4) has a coaxially outwardly extending insertion rod (711), the end of the insertion rod (711) extends to a position beyond the end of the arc-shaped heat conduction sheet (4) and in the rubber expansion sleeve (5), the rubber expansion sleeve (5) is provided with an insertion opening for the insertion rod (711), and the surface of the limiting rod (71) is further provided with a patch type pressure sensor (712), when the rubber expansion sleeve (5) is in a normal state, the surface of the limiting rod (71) is lower than the surface of the rubber expansion sleeve (5).

8. A pneumatic mechanical internal inflation mechanism according to claim 3, wherein, The linkage (72) is provided with a guide rod (721) and a sliding sleeve (722); The guide rod (721) is coaxially inserted into the deep hole (33), the end of the guide rod (721) is fixedly connected with the deep hole (33), and the diameter of the guide rod (721) is smaller than the diameter of the deep hole (33); The sliding sleeve (722) is slidably sleeved on the guide rod (721), the outer diameter of the sliding sleeve (722) is equal to the diameter of the deep hole (33), and the sliding sleeve (722) and the rotating shaft (3) are fixedly connected with a second compression spring (723) sleeved on the guide rod (721), and the locking piece (73) is connected with the sliding sleeve (722).

9. A pneumatic mechanical internal tensioning mechanism according to claim 8, characterized in that The locking piece (73) is provided with a clamping sleeve (731) and a columnar electromagnet (732); The surface of the sliding sleeve (722) is provided with an annular clamping opening (7221); The clamping sleeve (731) is clamped in the annular clamping opening (7221) on the sliding sleeve (722), and an extension plate (7311) is arranged on the side of the clamping sleeve (731) and extends towards the fixed shaft (1). The columnar electromagnet (732) is fixedly arranged on the rotating shaft (3), the end of the columnar electromagnet (732) extends outwardly through the middle part of the extension plate (7311) perpendicularly, a first sleeve ring (7321) made of magnet material is fixedly arranged on the columnar electromagnet (732) at a position corresponding to the columnar electromagnet (732) on the extension plate (7311).

10. A pneumatic mechanical internal inflation mechanism according to claim 9, wherein, The surface of the rotating shaft (3) is fixedly provided with a pressurized air pipe (733) vertically penetrating through the extension plate (7311) and close to the end position of the fixed shaft (1). The extension plate (7311) is fixedly provided with a second sleeve ring (7331) sleeved on the pressurized air pipe (733) at a position corresponding to the pressurized air pipe (733). The second sleeve ring (7331) is made of rubber. The rotating shaft (3) is communicated with the pressurized air pipe (733) and the deep hole (33) and is provided with a pressurized air port (331) for pushing the sliding sleeve (722) to move secondarily by air pressure.

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