A convex key type air expansion shaft with good fixing effect

Abstract

The present invention relates to the technical field of air expansion shaft equipment, and discloses a convex key type air expansion shaft with good fixing effect, comprising a shell, one end of the shell is fixedly connected to an air valve, one end of the air valve is fixedly connected to a gas connector, and a support shaft is fixedly installed in the middle of the inner cavity of the shell. Through the arrangement of a fixed block, a spur gear, a clamping block, a telescopic block and a rubber bellows, when the air expansion shaft is filled with high-pressure air, it can ensure that the spur gear can only rotate clockwise but not counterclockwise, so that the support block can only extend or remain stationary but cannot be compressed and retracted, and can play a secondary supporting role for the convex key to prevent the convex key from being forced to retract inward, and after the work is completed, when the air expansion shaft is depressurized, the telescopic block can retract under the rebound action of the rubber bellows, so that the spur gear can rotate counterclockwise at this time, ensuring that the support block can retract quickly with the airbag, which is convenient for quick disassembly.

Description

Technical Field

[0001] The invention relates to the technical field of gas expansion shaft equipment, in particular to a convex key type gas expansion shaft with good fixing effect. Background Art

[0002] The gas expansion shaft is a special winding and unwinding shaft, that is, the shaft can form a protrusion on the surface after being inflated with high pressure. The shaft whose surface part quickly retracts after being deflated is called a gas expansion shaft. The gas expansion shaft is divided into key-type gas expansion shaft, plate-type gas expansion shaft, dot gas expansion shaft, etc. Among them, the convex key-type gas expansion shaft body is made of high-quality steel pipe with chrome-plated surface, and the aluminum convex key is flexible. Because the convex key-type gas expansion shaft inflates a single key strip, the fulcrum is spread to each key strip, and the force is balanced, which can be used for mechanical winding of heavy objects.

[0003] However, the keyed air shaft in the prior art still has the following deficiencies in actual use: first, when acting in the sleeve, the keyed air shaft is supported by the sleeve by the expanded airbag, and the airbag is an expandable and contractible material. When the key is extended and held by the sleeve, as the air pressure inside the air shaft continues to increase, the area where the outer surface of the airbag contacts the key will inevitably become concave, which will cause the area where the airbag contacts the bottom edge of the key to be greatly deformed. If this continues for a long time, the local position of the airbag will be in an over-stretched state for a long time, which is easy to cause damage to the airbag or even tearing. Crack; secondly, when the sleeve is wrapped around the material, it often provides a large pulling force to straighten the material, so that the two sides of the wound material can be flush and the winding quality can be ensured. However, the airbag itself is elastic and it is difficult to provide sufficient and stable squeezing force on the convex key, causing the sleeve to slide relative to the air expansion shaft. This may affect the efficiency of the sleeve's winding material, or even cause the sleeve to unwind and need to be rewound. In addition, if the side of the convex key that is under force retracts, it may also cause a deviation in the center position between the air expansion shaft body and the sleeve, that is, uneven concentricity, causing the sleeve to rotate unsmoothly and produce loud noise when winding the material. Summary of the invention

[0004] In view of the shortcomings of the above-mentioned background technology, the present invention provides a key-type air expansion shaft with good fixing effect, which has the advantages of good supporting effect, being able to protect the airbag and realizing rapid disassembly, and solves the problems raised by the background technology.

[0005] The present invention provides the following technical solution: a convex key type air expansion shaft with good fixing effect, comprising a shell, one end of the shell is fixedly connected to an air valve, one end of the air valve is fixedly connected to a gas joint, a support shaft is fixedly installed in the middle of the inner cavity of the shell, both ends of the support shaft are fixedly connected to air bags, the side of the shell is movably sleeved with four groups of convex keys arranged equicircularly and fixedly connected to the air bags, an air intake main pipe is opened in the middle of one end of the support shaft, a branch pipe opened in the support shaft is arranged on the side of one end of the air intake main pipe, an intermediate pipe opened in the support shaft is arranged in the middle of one end of the air intake main pipe, four groups of installation cavities arranged equicircularly are opened on the side of the intermediate pipe, an air intake through hole is opened between the installation cavity and the intermediate pipe, and each group The mounting cavity is located directly below each group of convex keys, and limiting grooves are provided on both sides of the mounting cavity. One end of the two groups of limiting grooves away from the middle tube is fixedly connected to one end of a connecting spring, and the other end of the two groups of connecting springs is fixedly connected to a slider movably sleeved with the limiting groove, and the opposite side of the two groups of sliders is fixedly connected to a connecting rod, and the middle part of the connecting rod is fixedly connected to a fixing block, and both sides of the mounting cavity close to the middle of one end of the middle tube are hinged with one end of a first support rod, and the other ends of the two groups of the first support rods are hinged with a connecting block movably sleeved with the connecting rod, and one end of the two groups of connecting blocks away from the first support rod is hinged with one end of a second support rod, and the other end of the second support rod is hinged with a supporting block movably sleeved with the mounting cavity.

[0006] Preferably, a rotating shaft is movably sleeved inside the fixed block, a spur gear is fixedly connected to the side surface of one end of the rotating shaft, a first rack movably sleeved with the fixed block is meshed on the side of the spur gear close to the intermediate tube, a second rack movably sleeved with the fixed block is meshed on the side of the spur gear away from the intermediate tube, one end of the first rack is fixedly connected to one connecting block, one end of the second rack is fixedly connected to the other connecting block, a mounting ring is fixedly connected to the side surface of the other end of the rotating shaft, four groups of supporting springs arranged equicircularly are fixedly installed inside the mounting ring, the outer end of the supporting spring is fixedly connected to a clamping block movably sleeved with the mounting ring, four groups of active cavities outside the mounting ring are provided inside the fixed block, a rubber bellows is fixedly installed on one end of the active cavity away from the mounting ring, a telescopic block is fixedly connected to the end of the rubber bellows facing the rotating shaft, a gas channel is provided inside the connecting rod, one end of the gas channel extends into the fixed block, and the sides of one end of the four groups of rubber bellows are fixedly connected to connecting air pipes connected to the gas channel.

[0007] Preferably, there is a one-to-one correspondence between the convex key and the support block, the end of the convex key facing the support block is a concave arc, and the end of the support block facing the convex key is a convex arc matched therewith.

[0008] Preferably, a circular arc surface is provided on a clockwise side of the clamping block away from one end of the mounting ring, and a beveled slope surface is provided on a side of the telescopic block that is opposite to the clamping block when the telescopic block rotates clockwise.

[0009] Preferably, one end of the gas channel extending into the interior of the fixed block forms a circular ring-shaped cross section inside the fixed block, and the other end of the gas channel passes through the slider and communicates with the mounting cavity from the bottom of the slider.

[0010] The present invention has the following beneficial effects:

[0011] 1. Through the setting of the installation cavity, the support block and the connecting rod, the support block can synchronously support the convex key of the airbag on the inner side of the airbag, which can not only prevent the edge of the airbag contacting the convex key from being stretched severely and deformed, causing the airbag to tear due to long-term use, but also protect the airbag, and at the same time, it can provide auxiliary support to the convex key to avoid the convex key from shrinking under force and affecting the support effect of the air inflation shaft.

[0012] 2. By setting the fixed block, spur gear, clamping block, telescopic block and rubber bellows, when the inside of the air-expanding shaft is filled with high-pressure air, it can ensure that the spur gear can only rotate clockwise but not counterclockwise, so that the support block can only extend or be stationary but cannot be compressed and retracted, which can play a secondary supporting role for the cam, avoid the cam retracting inward due to force, and prevent the deviation of the center position between the air-expanding shaft body and the sleeve, resulting in the sleeve rotating unsmoothly and generating loud noise when winding the material. After the work is completed, when the internal pressure of the air-expanding shaft is released, the telescopic block can retract under the rebound action of the rubber bellows, so that the spur gear can rotate counterclockwise at this time, ensuring that the support block can retract quickly with the airbag, which is convenient for quick disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structural appearance of the present invention;

[0014] Figure 2 This is a schematic diagram of the interior of the structural support shaft of the present invention;

[0015] Figure 3 It is an enlarged schematic diagram of structure A of the present invention;

[0016] Figure 4 It is a schematic cross-sectional view of the structure BB of the present invention;

[0017] Figure 5 This is a schematic diagram of the interior of the structural fixing block of the present invention;

[0018] Figure 6 This is a schematic diagram of the interior of the structural installation ring of the present invention.

[0019] In the figure: 1. shell; 2. air valve; 3. gas connector; 4. support shaft; 5. air bag; 6. convex key; 7. intake main pipe; 8. branch pipe; 9. intermediate pipe; 10. installation cavity; 101. intake through hole; 11. limit groove; 12. connecting spring; 13. slider; 14. connecting rod; 15. first support rod; 16. connecting block; 17. second support rod; 18. support block; 19. fixing block; 20. rotating shaft; 21. spur gear; 22. first rack; 23. second rack; 24. installation ring; 25. support spring; 26. block; 27. movable cavity; 28. rubber bellows; 29. ​​telescopic block; 30. gas channel; 31. connecting air pipe. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-Figure 4 A convex key type air expansion shaft with good fixing effect comprises a shell 1, one end of the shell 1 is fixedly connected with an air valve 2, one end of the air valve 2 is fixedly connected with a gas connector 3, a support shaft 4 is fixedly installed in the middle of the inner cavity of the shell 1, both ends of the support shaft 4 are fixedly connected with air bags 5, the side of the shell 1 is movably sleeved with four groups of convex keys 6 arranged in equal circles and fixedly connected to the air bags 5, an intake manifold 7 is opened in the middle of one end of the support shaft 4, a branch pipe 8 opened in the support shaft 4 is arranged on the side of one end of the intake manifold 7, an intermediate pipe 9 opened in the support shaft 4 is arranged in the middle of one end of the intake manifold 7, four groups of installation cavities 10 arranged in equal circles are opened on the side of the intermediate pipe 9, an intake through hole 101 is opened between the installation cavity 10 and the intermediate pipe 9, and each group of installation cavities 10 is respectively located at each group of convex keys 6, both sides of the installation cavity 10 are provided with limiting grooves 11, and the ends of the two groups of limiting grooves 11 away from the middle tube 9 are fixedly connected to one end of the connecting spring 12, and the other ends of the two groups of connecting springs 12 are fixedly connected to the sliders 13 movably sleeved with the limiting grooves 11, and the opposite sides of the two groups of sliders 13 are fixedly connected to the connecting rods 14, and the middle part of the connecting rods 14 is fixedly connected to the fixing blocks 19, and the two sides of the middle part of one end of the installation cavity 10 close to the middle of the middle tube 9 are hinged to one end of the first support rod 15, and the other ends of the two groups of first support rods 15 are hinged to the connecting blocks 16 movably sleeved with the connecting rod 14, and the ends of the two groups of connecting blocks 16 away from the first support rod 15 are hinged to one end of the second support rod 17, and the other end of the second support rod 17 is hinged to the supporting block 18 movably sleeved with the installation cavity 10;

[0022] See also Figure 5 , Figure 6 The fixed block 19 is internally movably sleeved with a rotating shaft 20, and a spur gear 21 is fixedly connected to the side of one end of the rotating shaft 20. The side of the spur gear 21 close to the intermediate tube 9 is meshed with a first rack 22 movably sleeved with the fixed block 19, and the side of the spur gear 21 away from the intermediate tube 9 is meshed with a second rack 23 movably sleeved with the fixed block 19. One end of the first rack 22 is fixedly connected to the connecting block 16 on one side, and one end of the second rack 23 is fixedly connected to the connecting block 16 on the other side. A mounting ring 24 is fixedly connected to the side of the other end of the rotating shaft 20, and four groups of equicircularly arranged gears are fixedly installed inside the mounting ring 24. A support spring 25 is provided, and a block 26 movably sleeved with the mounting ring 24 is fixedly connected to the outer end of the support spring 25. Four groups of movable chambers 27 located outside the mounting ring 24 are provided inside the fixed block 19. A rubber bellows 28 is fixedly installed at one end of the movable chamber 27 away from the mounting ring 24. A telescopic block 29 is fixedly connected to one end of the rubber bellows 28 facing the rotating shaft 20. A gas channel 30 is provided inside the connecting rod 14, and one end of the gas channel 30 extends into the fixed block 19. The sides of one end of the four groups of rubber bellows 28 are fixedly connected to connecting air pipes 31 connected to the gas channel 30.

[0023] like Figure 4 There is a one-to-one correspondence between the convex key 6 and the support block 18. The end of the convex key 6 facing the support block 18 is a concave arc, and the end of the support block 18 facing the convex key 6 is a convex arc matched therewith. Since the support block 18 is on the inner side of the airbag 5, the airbag 5 can synchronously support the convex key 6. It can not only prevent the edge of the airbag 5 that contacts the convex key 6 from being stretched severely and deformed greatly, causing the airbag 5 to tear due to long-term use, but also protect the airbag 5. At the same time, it can also provide auxiliary support for the convex key 6 to prevent the convex key 6 from shrinking under force and affecting the supporting effect of the air inflation shaft.

[0024] like Figure 5 , Figure 6 The clockwise side of the clamping block 26 away from the mounting ring 24 is provided with an arc surface, and the side of the telescopic block 29 opposite to the clamping block 26 when rotating clockwise is provided with an oblique slope surface. Through the cooperation of the clamping block 26 and the telescopic block 29, when the inside of the air-expanding shaft is filled with high-pressure air, the spur gear 21 can only rotate clockwise but not counterclockwise, so that the support block 18 can only extend or remain stationary but cannot be compressed and retracted, which can play a secondary supporting role for the convex key 6, avoiding the convex key 6 from being retracted inward due to force, causing the deviation of the center position between the air-expanding shaft body and the sleeve, causing the sleeve to rotate unsmoothly and produce large noise when winding the material.

[0025] like Figure 3 , Figure 5, one end of the gas channel 30 extending into the interior of the fixed block 19 forms a circular ring-shaped cross section inside the fixed block 19, and the other end of the gas channel 30 passes through the slider 13 and is connected to the mounting cavity 10 from the bottom of the slider 13. The setting of the gas channel 30 can conduct the air pressure inside the gas expansion shaft into the rubber bellows 28, and can ensure that the telescopic block 29 is always in an extended state when the gas expansion shaft is working, so that the gas expansion shaft can be inflated through the arc surface of the block 26 and the bevel slope of the telescopic block 29. When the block 26 rotates clockwise, the block 26 can automatically retract, ensuring that the rotating shaft 20 and the spur gear 21 can rotate clockwise but not counterclockwise, ensuring that the support block 18 can be synchronously extended with the airbag 5 to play an auxiliary support role, and after the work is completed, when the pressure inside the gas expansion shaft is released, the telescopic block 29 can retract under the rebound action of the rubber bellows 28, so that the spur gear 21 can rotate counterclockwise at this time, ensuring that the support block 18 can quickly retract with the airbag 5, which is convenient for quick disassembly.

[0026] Working principle: when the air-inflating shaft is working, the gas enters from the intake manifold 7, and enters the branch pipe 8 and the intermediate pipe 9 respectively. The gas entering the airbag 5 supports and expands the airbag 5, and at the same time drives the convex key 6 to support and tighten outward. At the same time, the gas will enter each installation cavity 10 and the rubber bellows 28 from the intermediate pipe 9. Under the internal air pressure of the installation cavity 10 and the drive of the airbag 5, the connecting blocks 16 on both sides will simultaneously drive the first support rod 15 and the second support rod 17 at both ends to approach the fixed block 19. At this time, the first rack 22 and the second rack drive the spur gear 21 to rotate clockwise during the relative movement, and the arc of the clockwise rotating block 26 faces the oblique slope of the extended telescopic block 29. Therefore, the rotating shaft 20 can rotate, which can enable the support block 18 to push outward to assist in supporting the airbag 5 and the convex key 6.

[0027] After the air-expanding shaft is fixed, when the convex key 6 is subjected to a large force causing the airbag 5 to be partially compressed and contracted, since the support block 18 needs to move inward, the fixed blocks 19 on both sides need to drive the first support rod 15 and the second support rod 17 to bend to both sides, that is, the first rack 22 and the second rack 23 need to be able to drive the spur gear 21 to rotate counterclockwise. During the counterclockwise rotation, the vertical surface of the clamping block 26 abuts against the vertical surface of the telescopic block 29, and the telescopic block 29 cannot be retracted under the action of the internal air pressure of the rubber bellows 28. Therefore, the telescopic block 29 will clamp the clamping block 26, so that the spur gear 21 cannot rotate counterclockwise, thereby causing the support block 18 to be unable to move inward, thereby playing a secondary supporting role for the convex key 6, ensuring the stability of the air-expanding shaft support, and preventing the convex key 6 from being compressed and causing the air-expanding shaft support effect to deteriorate.

[0028] When disassembling the inflatable shaft, the gas inside the inflatable shaft is released through the air valve. As the air pressure decreases, the rubber bellows 28 will drive the telescopic block 29 to retract into the movable cavity 27 under its own rebound effect, so that the rotating shaft 20 can rotate counterclockwise at this time. Therefore, when the airbag 5 retracts, it can drive the convex key 6 and the support block 18 to return to their original positions synchronously, making it easy to remove them quickly and improving work efficiency.

[0029] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A convex key type air expansion shaft with good fixing effect, comprising a housing (1), one end of the housing (1) is fixedly connected to an air valve (2), one end of the air valve (2) is fixedly connected to a gas connector (3), characterized in that: A support shaft (4) is fixedly installed in the middle of the inner cavity of the shell (1), and air bags (5) are fixedly connected to both ends of the support shaft (4). Four groups of convex keys (6) arranged in equal circumference and fixedly connected to the air bags (5) are movably sleeved on the side of the shell (1). An intake manifold (7) is provided in the middle of one end of the support shaft (4), and a branch pipe (8) arranged inside the support shaft (4) is provided on the side of one end of the intake manifold (7). An intermediate pipe (9) arranged inside the support shaft (4) is provided in the middle of one end of the intake manifold (7). Four groups of installation cavities (10) arranged in equal circumference are provided on the side of the intermediate pipe (9), and an intake through hole (101) is provided between the installation cavity (10) and the intermediate pipe (9). Each group of the installation cavities (10) is located directly below each group of convex keys (6), and both sides of the installation cavity (10) are provided with limiting grooves (11). One end of the two groups of limiting grooves (11) away from the middle tube (9) is fixedly connected to one end of a connecting spring (12), and the other end of the two groups of connecting springs (12) is fixedly connected to a slider (13) movably sleeved with the limiting groove (11). The opposite side of the two groups of sliders (13) is fixedly connected to a connecting rod (14), and a fixing block (19) is fixedly connected to the middle of the connecting rod (14). One end of a first support rod (15) is hingedly connected to both sides of the middle of one end of the installation cavity (10) close to the middle of the middle tube (9). The other ends of the two groups of the first support rod (15) are hingedly connected to a connecting block (16) movably sleeved with the connecting rod (14). One end of the two groups of the connecting block (16) away from the first support rod (15) is hingedly connected to one end of a second support rod (17), and the other end of the second support rod (17) is hingedly connected to a supporting block (18) movably sleeved with the installation cavity (10); The fixed block (19) is internally movably sleeved with a rotating shaft (20), and a spur gear (21) is fixedly connected to the side of one end of the rotating shaft (20). The side of the spur gear (21) close to the intermediate tube (9) is meshed with a first rack (22) movably sleeved with the fixed block (19), and the side of the spur gear (21) away from the intermediate tube (9) is meshed with a second rack (23) movably sleeved with the fixed block (19). One end of the first rack (22) is fixedly connected to a connecting block (16) on one side, and one end of the second rack (23) is fixedly connected to a connecting block (16) on the other side. The side of the other end of the rotating shaft (20) is fixedly connected with a mounting ring (24), and four groups of equicircularly arranged gears are fixedly installed inside the mounting ring (24). A support spring (25), the outer end of the support spring (25) is fixedly connected to a clamping block (26) movably sleeved with the mounting ring (24), the interior of the fixed block (19) is provided with four groups of movable chambers (27) located outside the mounting ring (24), one end of the movable chamber (27) away from the mounting ring (24) is fixedly installed with a rubber bellows (28), one end of the rubber bellows (28) facing the rotating shaft (20) is fixedly connected to a telescopic block (29), the interior of the connecting rod (14) is provided with a gas channel (30), one end of the gas channel (30) extends into the interior of the fixed block (19), and the side surfaces of one end of the four groups of rubber bellows (28) are fixedly connected with connecting air pipes (31) connected to the gas channel (30); One end of the gas channel (30) extending into the interior of the fixed block (19) forms a circular ring-shaped cross section inside the fixed block (19), and the other end of the gas channel (30) penetrates the slider (13) and communicates with the mounting cavity (10) from the bottom of the slider (13).

2. A key-type air expansion shaft with good fixing effect according to claim 1, characterized in that: The convex key (6) corresponds to the support block (18) in a one-to-one manner; the end of the convex key (6) facing the support block (18) is in a concave arc shape, and the end of the support block (18) facing the convex key (6) is in a convex arc shape matching the convex key (6).

3. A key-type air expansion shaft with good fixing effect according to claim 2, characterized in that: The clockwise side of the clamping block (26) away from the mounting ring (24) is provided with an arc surface, and the side of the telescopic block (29) opposite to the clamping block (26) when rotating clockwise is provided with an oblique slope surface.

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