CN116619789A - Radial movable air spring forming drum and control method thereof - Google Patents

Abstract

The utility model discloses a radial movable air spring forming drum, which comprises: the guide ring is sleeved at the middle part of the main shaft, and the connecting rings are sleeved at the two ends of the main shaft; a plurality of guide pieces are uniformly distributed at the outer end part of the guide ring, and each guide piece is provided with a radial driving telescopic mechanism which can radially stretch; the outer end part of the connecting ring is uniformly provided with a plurality of connecting pieces, and each connecting piece is slidably provided with a radial linkage telescoping mechanism which is driven by a radial driving telescoping mechanism to radially telescope; each radial driving telescopic mechanism is provided with a detection mechanism; and each radial driving telescopic mechanism and each radial linkage telescopic mechanism are fixedly connected with a fixing mechanism. The utility model discloses a control method of a radial movable air spring forming drum, which is suitable for producing air springs with multiple sizes; the molding precision is improved; the embryo is convenient to unload, and the uneven phenomenon is reduced.

Description

Radial movable air spring forming drum and control method thereof

Technical Field

The utility model relates to the field of air spring forming machines, in particular to a radial movable air spring forming drum and a control method thereof.

Background

The production of the rubber air spring is that the rubber layer and the ply are sent to the forming drum tile plate to be lapped through the feeder, the air spring is formed through the rotation of the forming drum, the rubber layer and the ply are pressed and laminated through the pressing roller, and after the steel ring clamp is installed and fixed at a designated position, the air spring is positively and negatively wrapped, and finally, the air spring is inflated and the blank is unloaded. The traditional scheme has the problems of single size, inconvenience in embryo unloading, lower molding precision and the like.

The utility model of China with the publication number of CN 212352993U discloses a molding mechanism for a rubber air spring molding machine, wherein an adaptive rubber air spring blastula is sleeved and mounted on a supporting sleeve, a driving mandrel is pushed to move forwards by a power mechanism on the molding machine, an inner supporting block slides forwards along a sliding groove along with the driving mandrel, and the outer supporting block is outwards ejected in the forward sliding process of the inner supporting block by matching between the inclined end face of the upper end of the inner supporting block and the inclined end face of the lower end of the outer supporting block, so that the outer supporting block is outwards supported by the inner supporting block, the blastula is inflated under the supporting action, and the rubber air spring embryo tube is obtained. After the forming operation is finished, the driving mandrel is driven to move backwards through a power mechanism on the forming machine, the inner supporting block moves backwards along the sliding groove along with the driving mandrel, at the moment, the jacking action of the inner supporting block on the outer supporting block disappears, the elastic shrinkage ring and the supporting sleeve are elastically reset, inward folding and resetting of the inner supporting tile and the outer supporting tile are realized, and then the formed embryo tube is taken down from the forming mechanism. The patent has the problem that the molding size is single, and the production of air springs with various models cannot be realized.

The utility model in China with the publication number of CN 113635584A relates to a forming drum with a variable working diameter, which comprises a main shaft group, an anti-encapsulation barrel mechanism, a sliding lock block assembly and a power mechanism, wherein the sliding lock block assembly comprises a guide plate, a guide disc, a sliding block and a lock block, the guide plate and the guide disc are sleeved on the main shaft group and form a slideway between the guide plate and the main shaft group, the sliding block and the lock block are in one-to-one correspondence, the sliding block is circumferentially embedded in the slideway and fixed with the corresponding lock block, a gap is reserved between the lock block and the side surface of the slideway so as to be separated from the slideway, the power mechanism is arranged on the main shaft group, and the anti-encapsulation barrel mechanism is detachably connected to the power mechanism. The patent solves the problem of single molding size, but has the problem of inconvenient embryo unloading.

The utility model of China with the publication number of CN 209238935U discloses a novel air spring forming machine head, which comprises an outer cylinder, wherein round grooves and groove bodies are respectively formed in the left side surface and the right side outer wall of the outer cylinder, the round grooves and the groove bodies are communicated through L-shaped air pipes, electromagnets and piston rings are respectively arranged on the left side and the right side of the round grooves, magnetic rings are arranged on the left side of the piston rings, annular rubber sheets are fixedly connected with the left end and the right end of the groove bodies, the annular rubber sheets are fixedly connected with rubber sleeves, the electromagnets are electrified to push the magnetic rings and the piston rings rightward, air in the round grooves and the groove bodies is compressed, the annular rubber sheets and the rubber sleeves are expanded, so that semi-finished air bags are outwards expanded and fixed, sealing is kept, after combined forming, the electromagnets are closed, and the formed air bags can be released, so that the fixing and the dismounting are convenient. The patent solves the problems of inconvenient and uneven embryo unloading, but has lower molding precision.

Therefore, a radial movable air spring forming drum and a control method thereof are needed to solve the problems of single size, low forming precision, inconvenient blank unloading and the like.

Disclosure of Invention

In view of the above, an object of the present utility model is to provide a radially movable air spring forming drum, which is suitable for multi-sized air spring production; the molding precision is improved; the embryo is convenient to unload, and the uneven phenomenon is reduced.

In order to achieve the technical purpose, the utility model adopts the following technical scheme:

the utility model provides a radially movable air spring building drum, comprising: the guide ring is sleeved at the middle part of the main shaft, and the connecting rings are sleeved at the two ends of the main shaft; a plurality of guide pieces are uniformly distributed at the outer end part of the guide ring, and each guide piece is provided with a radial driving telescopic mechanism which can radially stretch; the outer end part of the connecting ring is uniformly provided with a plurality of connecting pieces, and each connecting piece is slidably provided with a radial linkage telescoping mechanism which is driven by a radial driving telescoping mechanism to radially telescope; each radial driving telescopic mechanism is provided with a detection mechanism; and each radial driving telescopic mechanism and each radial linkage telescopic mechanism are fixedly connected with a fixing mechanism.

Further, each guide piece is provided with a guide groove; each radial driving telescopic mechanism comprises an electric cylinder motor, a connecting bolt and an electric cylinder body which are sequentially and fixedly installed in the guide groove from inside to outside, wherein the electric cylinder motor is movably connected with one end of the electric cylinder body through the connecting bolt, the other end of the electric cylinder body is movably connected with an electric cylinder piston rod which can radially extend and retract, and the electric cylinder piston rod is installed on the fixing mechanism.

Further, each connecting piece is provided with a chute; each radial linkage telescopic mechanism comprises a sliding block and a connecting rod, the sliding blocks are slidably connected in the sliding grooves, one end of each connecting rod is fixedly connected with one end of each sliding block, which is far away from the connecting ring, of each connecting rod, and the other end of each connecting rod is arranged on the fixing mechanism.

Further, each detection mechanism is a displacement sensor and is arranged on the cylinder body of the electric cylinder.

Further, each fixing mechanism comprises an inward-placed arc-shaped connecting plate and an outward-placed arc-shaped tile, and a plurality of tiles are spliced to form a cylindrical structure; the connecting rod and the electric cylinder piston rod are detachably and fixedly connected to the connecting plate and the tile plate.

Further, the device also comprises a power mechanism, wherein the power mechanism comprises a servo motor and a coupler, and the servo motor is connected with one end of the main shaft through the coupler.

Further, the guide ring and the main shaft and the connecting rings and the main shaft are radially fixed through key pins; and the guide ring and the main shaft and the connecting rings and the main shaft are axially fixed through elastic check rings.

Furthermore, the number of the guide pieces on the guide ring, the connecting pieces on the connecting ring connected with one end of the main shaft and the connecting pieces on the connecting ring connected with the other end of the main shaft are identical, one guide piece and two connecting pieces on the opposite positions form a group, and the installation positions of each group are parallel.

Further, the electric cylinder body is fixed in the guide groove through a positioning bolt.

The utility model also provides a control method of the radial movable air spring forming drum, which needs to provide the radial movable air spring forming drum, and comprises the following steps:

step 1, fixedly connecting one ends of a connecting rod and a piston rod of an electric cylinder to a connecting plate and a tile plate, and connecting the other end of the connecting rod to a chute of a connecting piece in a sliding way through a sliding block; the other end of the electric cylinder piston rod is arranged in the electric cylinder body, one end of the electric cylinder body is connected with the electric cylinder motor through a connecting bolt, and a detection mechanism is arranged outside the electric cylinder body;

step 2, driving a cylinder piston rod to extend through the electric cylinder motor, and simultaneously enabling the connecting rod and the sliding block to slide out of the sliding groove outwards to drive the tile plate to radially extend;

step 3, the detection mechanism detects the position of the piston rod of the electric cylinder and feeds back, the piston rod of the electric cylinder is controlled by the electric cylinder motor to reach the set radial dimension, the rubber layer and the ply are lapped on the tile plate by the automatic feeding machine, rotary forming is carried out, and compaction and lamination are carried out by the compression roller;

and 4, after the molding is completed, the electric cylinder piston rod is retracted, meanwhile, the connecting rod and the sliding block inwards slide in the sliding groove, the tile plate is driven by the electric cylinder piston rod and the connecting piece to realize the shrinkage of the molding drum, and the embryo unloading of the rubber air spring is completed.

By adopting the technical scheme, compared with the prior art, the utility model has the beneficial effects that:

1. aiming at the problem of single molding size: the traditional fixed forming drum is changed into a radial movable forming drum driven by the electric cylinder, the radial size of the forming drum is changed through the electric cylinder, the elastic sleeve outside the forming drum can be replaced, and the roundness of the forming drum is ensured, so that the forming drum can meet the production of rubber air springs with different sizes, and the production cost is saved.

2. Improving the forming precision: the position and the telescopic length of the electric cylinder piston are fed back and controlled through the displacement sensor, the electric cylinder is used for enabling the building drum to be simpler and more convenient in structure, the installation is convenient, the position accuracy of the electric cylinder is controlled more excellent, and the production accuracy and quality of products can be effectively improved.

3. The embryo is convenient to unload: radial scalability makes the embryo unloading more simple and convenient, has avoided the inhomogeneous phenomenon that the inflation expansion mode unloaded embryo and leads to.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is an axial view of a radially movable air spring building drum of the present utility model.

Fig. 2 is a radial cross-sectional view of a radially movable air spring building drum of the present utility model.

Fig. 3 is a radial cross-sectional view of a spindle of a radially movable air spring of the present utility model.

FIG. 4 is a schematic view of a radially movable air spring building drum of the present utility model in a bulging state.

FIG. 5 is a schematic view of a radially movable air spring building drum of the present utility model in a contracted state.

Fig. 6 is a schematic diagram of the overall operation of the present utility model.

The reference numerals in the figures illustrate:

spindle 1, guide ring 2, connecting ring 3, guide 4, guide groove 41, radial drive telescoping mechanism 5, electric cylinder motor 51, connecting bolt 52, electric cylinder body 53, electric cylinder piston rod 54, positioning bolt 55, connecting piece 6, slide groove 61, radial linkage telescoping mechanism 7, slider 71, connecting rod 72, detection mechanism 8, displacement sensor 81, fixing mechanism 9, connecting plate 91, tile 92, power mechanism 10, servo motor 101, coupling 102, external controller 11, key pin 12, circlip 13.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is specifically noted that the following examples are only for illustrating the present utility model, but do not limit the scope of the present utility model. Likewise, the following examples are only some, but not all, of the examples of the present utility model, and all other examples, which a person of ordinary skill in the art would obtain without making any inventive effort, are within the scope of the present utility model.

The utility model provides a radial movable air spring forming drum which can be suitable for the production of air springs with multiple sizes; the molding precision is improved; the embryo is convenient to unload, and the uneven phenomenon is reduced.

Referring to fig. 1-6, a radially movable air spring building drum of the present utility model includes: the device comprises a main shaft 1, wherein a guide ring 2 is sleeved in the middle of the main shaft 1, and connecting rings 3 are sleeved at two ends of the main shaft 1; a plurality of guide pieces 4 are uniformly distributed at the outer end part of the guide ring 2, and a radial driving telescopic mechanism 5 which can radially extend and retract is arranged on each guide piece 4; a plurality of connecting pieces 6 are uniformly distributed at the outer end part of the connecting ring 3, and a radial linkage telescoping mechanism 7 which is driven by a radial driving telescoping mechanism 5 to radially telescope is slidably arranged on each connecting piece 6; each radial driving telescopic mechanism 5 is provided with a detection mechanism 8; each radial driving telescopic mechanism 5 and each radial linkage telescopic mechanism 7 are fixedly connected with a fixing mechanism 9. The detection mechanism 8 monitors feedback and controls radial telescopic movement of the radial driving telescopic mechanism 5, so that radial telescopic movement of the radial linkage telescopic mechanism 7 is driven to occur, the fixing mechanism 9 is driven to occur telescopic movement, and further expansion and contraction of the forming drum are achieved, and accordingly the forming drum can meet production of rubber air springs of different sizes.

In the present embodiment, a guide groove 41 is provided on each of the guides 4; each radial driving telescopic mechanism 5 comprises an electric cylinder motor 51, a connecting bolt 52 and an electric cylinder body 53 which are sequentially and fixedly arranged in the guide groove 41 from inside to outside, wherein the electric cylinder motor 51 is movably connected with one end of the electric cylinder body 53 through the connecting bolt 52, the other end of the electric cylinder body 53 is movably connected with an electric cylinder piston rod 54 which can radially extend and retract, the electric cylinder piston rod 54 is arranged on the fixing mechanism 9, the outer end of the electric cylinder piston rod 54 is connected on the fixing mechanism 9 (a connecting plate 91 and a tile 92) through threads, and the threads ensure the stability and the detachability of the electric cylinder motor; the cylinder block 53 is fixed in the guide groove 41 by a positioning bolt 55. The cylinder motor 51 drives the cylinder piston rod 54 in the cylinder block 53 to perform telescopic movement, and the cylinder piston rod 54 drives the radial linkage telescopic mechanism 7 (the connecting rod 72 and the slider 71) and the fixing mechanism 9 (the tile 92 and the connecting plate 91) to perform telescopic movement.

In this embodiment, each of the connecting pieces 6 is provided with a chute 61; each radial linkage telescopic mechanism 7 comprises a sliding block 71 and a connecting rod 72, wherein the sliding block 71 is slidably connected in the sliding groove 61, and the sliding block 71 can slide in the sliding groove 61 during radial telescopic movement; one end of the connecting rod 72 is fixedly connected with one end of the slider 71 far away from the connecting ring 3, and can be fixed through threaded connection; the other end of the connecting rod 72 is arranged on the fixing mechanism 9 and can be fixed through threaded connection, so that the fixing of the connecting rod 72 and the fixing mechanism 9 (the connecting plate 91 and the tile 92) is ensured; the threaded connection ensures its stability and removability.

In the present embodiment, each of the detecting mechanisms 8 is a displacement sensor 81 mounted on the cylinder block 53; in order to achieve radial multi-dimension, a displacement sensor 81 is arranged on the electric cylinder body 53, the telescopic length of the electric cylinder piston rod 54 can be monitored through the displacement sensor 81 and fed back to the external controller 11, the external controller 11 further controls the telescopic position of the electric cylinder piston rod 54 through controlling the electric cylinder motor 51 to act, the telescopic movement of the fixing mechanism 9 is realized, the expansion and contraction of the forming drum is realized, the radial dimension of the forming drum is changed through the telescopic movement of the electric cylinder piston rod 54, and accordingly the forming drum can meet the production of rubber air springs with different dimensions. After the set radial dimension is reached, the cylinder piston rod 54 automatically stops and locks, so that the pressure of the lower pressing roller when the forming drum is attached can be borne, and the radial displacement of the forming drum and the forming precision are ensured.

It should be noted that the present utility model further includes an external controller 11, the external controller 11 is connected with the electric cylinder motor 51 and the displacement sensor 81, the displacement sensor 81 feeds back the collected telescopic length data of the electric cylinder piston rod 54 to the external controller 11, the external controller 11 compares the fed back length data with the set radial dimension, and controls the electric cylinder motor 51 to perform corresponding adjustment according to the comparison result, when the fed back length data is the same as the set radial dimension, the external controller 11 controls the electric cylinder motor 51 to pause, and at this time, the electric cylinder piston rod 54 automatically stops and locks, so as to realize control automation.

In this embodiment, each fixing mechanism 9 includes an inwardly disposed arc-shaped connecting plate 91 and an outwardly disposed arc-shaped tile 92, and a plurality of tiles 92 are spliced to form a cylindrical structure; the connecting rod 72 and the cylinder piston rod 54 are detachably and fixedly connected to the connecting plate 91 and the tile 92. The shoe 92 is moved radially by the cylinder piston rod 54 and the connecting rod 72. When rubber air springs with different sizes are produced, the corresponding extension length of the cylinder piston rod 54 is set only through the external controller 11, meanwhile, the roundness of the cylinder piston rod is guaranteed by using an elastic sleeve with corresponding size outside the tile 92, and after the expansion and the forming of the forming drum are finished, the cylinder piston rod 54 is controlled to retract, so that the shrinkage of the forming drum can be finished.

In the embodiment, the device further comprises a power mechanism 10, wherein the power mechanism 10 comprises a servo motor 101 and a coupler 102, and the servo motor 101 is connected with one end of the main shaft 1 through the coupler 102; the main shaft 1 is powered, and the main shaft 1 drives the forming drum to rotate.

In this embodiment, the guide ring 2 and the spindle 1 and the two connecting rings 3 and the spindle 1 are radially fixed by the key pins 12, so that the guide ring 2 and the connecting rings 3 are prevented from radial movement; the guide ring 2 and the main shaft 1 and the connecting ring 3 and the main shaft 1 are axially fixed through the elastic check ring 13, and are fixed through the shaft shoulder of the stepped shaft and the elastic check ring 13, so that axial movement of the guide ring is prevented.

In this embodiment, the number of the guide members 4 on the guide ring 2, the number of the connecting members 6 on the connecting ring 3 connected with one end of the main shaft 1, and the number of the connecting members 6 on the connecting ring 3 connected with the other end of the main shaft 1 are identical, and one guide member 4 and two connecting members 6 on opposite positions form a group, and the installation positions of each group are parallel, so that one guide member 4 and two connecting rings 3 on parallel positions can be oppositely arranged with the same connecting plate 91 and tile 92, thereby facilitating installation; the radial driving telescopic mechanism 5 positioned in the guide piece 4 and the radial linkage telescopic mechanism 7 positioned in the connecting ring 3 can be arranged on the same connecting plate 91 and the tile 92, so that the radial driving telescopic mechanism 5, the two radial linkage telescopic mechanisms 7 and the tile 92 can synchronously stretch.

The degree of freedom of the radial drive telescopic mechanism 5 can be expressed as:

F＝3n-(2p _l +p _h -p')-F'

＝3×5-(2×5+2-0)-1

＝2

wherein F is the degree of freedom of the radial drive telescopic mechanism 5; n-number of movable members; p is p _l -low secondary number; p is p _h -high secondary number; p' -the number of virtual constraints; f' -number of local degrees of freedom;

it can be seen from the calculation that the radial drive telescopic mechanism 5 has 2 degrees of freedom in total, and 2 driving elements of the radial drive telescopic mechanism 5 are provided, one is the main shaft 1 responsible for the integral rotation, and the other is the electric cylinder body 53 responsible for the radial extension, so that the movement of the radial drive telescopic mechanism 5 can be determined.

The utility model also provides a control method of the radial movable air spring forming drum, which needs to provide the radial movable air spring forming drum, and comprises the following steps:

step 1, fixedly connecting one end of a connecting rod 72 and an electric cylinder piston rod 54 to a connecting plate 91 and a tile 92, and slidingly connecting the other end of the connecting rod 72 to a sliding groove 61 of a connecting piece 6 through a sliding block 72, wherein the connecting plate 91 can disperse the pressure born by the tile 92 so as to ensure that the tile 92 cannot bend and deform; the other end of the electric cylinder piston rod 54 is arranged in the electric cylinder body 53, one end of the electric cylinder body 53 is connected with the electric cylinder motor 51 through a connecting bolt 52, and a detection mechanism 8 is arranged outside the electric cylinder body 53;

step 2, driving the cylinder piston rod 54 to extend through the cylinder motor 51, and simultaneously enabling the connecting rod 72 and the sliding block 71 to slide out in the sliding groove 61 to drive the tile 92 to radially extend;

step 3, the detection mechanism 8 detects the position of the electric cylinder piston rod 54 and feeds back, the electric cylinder motor 51 controls the electric cylinder piston rod 54 to reach the set radial size, the automatic feeding machine is used for overlapping the rubber layer and the ply on the tile 92 for rotary forming, and the compression roller is used for compacting and laminating;

and 4, after the forming is completed, the electric cylinder piston rod 54 is retracted, meanwhile, the connecting rod 72 and the sliding block 71 slide inwards in the sliding groove 61, and the tile 92 is driven by the electric cylinder piston rod 54 and the connecting rod 72 to realize the shrinkage of the forming drum, so that the embryo unloading of the rubber air spring is completed.

In step 3, the detecting mechanism 8 detects the position of the cylinder piston rod 54 and feeds back, and controls the cylinder piston rod 54 to reach the set radial dimension through the cylinder motor 51, specifically:

the detection mechanism 8 is a displacement sensor 81, and further comprises an external controller 11, wherein the external controller 11 is respectively connected with the electric cylinder motor 51 and the displacement sensor 81;

the displacement sensor 81 feeds back the collected telescopic length data of the electric cylinder piston rod 54 to the external controller 11, the external controller 11 compares the fed-back length data with the set radial dimension, the electric cylinder motor 51 is controlled to correspondingly adjust according to the comparison result, when the fed-back length data is the same as the set radial dimension, the external controller 11 controls the electric cylinder motor 51 to pause, and at the moment, the electric cylinder piston rod 54 automatically stops and locks, so that control automation is realized.

The foregoing description is only a partial embodiment of the present utility model, and is not intended to limit the scope of the present utility model, and all equivalent devices or equivalent processes using the descriptions and the drawings of the present utility model or directly or indirectly applied to other related technical fields are included in the scope of the present utility model.

Claims (10)

1. A radially movable air spring building drum, comprising: the guide ring is sleeved at the middle part of the main shaft, and the connecting rings are sleeved at the two ends of the main shaft; a plurality of guide pieces are uniformly distributed at the outer end part of the guide ring, and each guide piece is provided with a radial driving telescopic mechanism which can radially stretch; the outer end part of the connecting ring is uniformly provided with a plurality of connecting pieces, and each connecting piece is slidably provided with a radial linkage telescoping mechanism which is driven by a radial driving telescoping mechanism to radially telescope; each radial driving telescopic mechanism is provided with a detection mechanism; and each radial driving telescopic mechanism and each radial linkage telescopic mechanism are fixedly connected with a fixing mechanism.

2. A radially movable air spring building drum according to claim 1, wherein each of said guide members is provided with a guide groove; each radial driving telescopic mechanism comprises an electric cylinder motor, a connecting bolt and an electric cylinder body which are sequentially and fixedly installed in the guide groove from inside to outside, wherein the electric cylinder motor is movably connected with one end of the electric cylinder body through the connecting bolt, the other end of the electric cylinder body is movably connected with an electric cylinder piston rod which can radially extend and retract, and the electric cylinder piston rod is installed on the fixing mechanism.

3. A radially movable air spring building drum according to claim 2, wherein each of said connectors is provided with a chute; each radial linkage telescopic mechanism comprises a sliding block and a connecting rod, the sliding blocks are slidably connected in the sliding grooves, one end of each connecting rod is fixedly connected with one end of each sliding block, which is far away from the connecting ring, of each connecting rod, and the other end of each connecting rod is arranged on the fixing mechanism.

4. A radially movable air spring building drum according to claim 2, wherein each of said sensing means is a displacement sensor mounted on the cylinder block.

5. A radially movable air spring building drum according to claim 3, wherein each of said fixing means comprises an inwardly disposed arcuate web and an outwardly disposed arcuate tile, a plurality of said tiles being spliced to form a cylindrical structure; the connecting rod and the electric cylinder piston rod are detachably and fixedly connected to the connecting plate and the tile plate.

6. A radially movable air spring building drum according to claim 1, further comprising a power mechanism, said power mechanism comprising a servo motor and a coupling, said servo motor being connected to one end of the main shaft by means of the coupling.

7. A radially movable air spring building drum according to claim 1, wherein the guide ring is radially fixed to the main shaft and the connecting rings are radially fixed to the main shaft by means of key pins; and the guide ring and the main shaft and the connecting rings and the main shaft are axially fixed through elastic check rings.

8. A radially movable air spring building drum according to claim 1, wherein the number of guide members on the guide ring, the number of connecting members on the connecting ring connecting one end of the main shaft and the number of connecting members on the connecting ring connecting the other end of the main shaft are identical, and one guide member and two connecting members on opposite positions form a group, and the mounting positions of each group are parallel.

9. A radially movable air spring building drum according to claim 2, wherein the cylinder block is fixed in the guide groove by means of a positioning bolt.

10. A method of controlling a radially movable air spring building drum according to claim 3, comprising the steps of:

step 1, fixedly connecting one ends of a connecting rod and a piston rod of an electric cylinder to a connecting plate and a tile plate, and connecting the other end of the connecting rod to a chute of a connecting piece in a sliding way through a sliding block; the other end of the electric cylinder piston rod is arranged in the electric cylinder body, one end of the electric cylinder body is connected with the electric cylinder motor through a connecting bolt, and a detection mechanism is arranged outside the electric cylinder body;

step 2, driving a cylinder piston rod to extend through the electric cylinder motor, and simultaneously enabling the connecting rod and the sliding block to slide out of the sliding groove outwards to drive the tile plate to radially extend;

step 3, the detection mechanism detects the position of the piston rod of the electric cylinder and feeds back, the piston rod of the electric cylinder is controlled by the electric cylinder motor to reach the set radial dimension, the rubber layer and the ply are lapped on the tile plate by the automatic feeding machine, rotary forming is carried out, and compaction and lamination are carried out by the compression roller;

and 4, after the molding is completed, the electric cylinder piston rod is retracted, meanwhile, the connecting rod and the sliding block inwards slide in the sliding groove, the tile plate is driven by the electric cylinder piston rod and the connecting piece to realize the shrinkage of the molding drum, and the embryo unloading of the rubber air spring is completed.