A mechanism for switching between a welted tire mold

Abstract

The present application relates to the technical fields of vehicle manufacturing equipment, and discloses a rolling edge tire mold switching mechanism, which comprises a supporting unit and a walking unit, the walking unit comprises a walking frame and walking wheels; the supporting unit comprises a base, a guide rail module, a tire mold support, a lifting module, a positioning module and a lifting module, the lifting module comprises a driving mechanism and a lifting block, the guide rail module has a vehicle receiving position on the lifting module, a working position on the positioning module and a transition position higher than the vehicle receiving position; the tire mold support is arranged on the base, the lifting module is arranged on the base, and the positioning module is arranged on the base to position the rolling edge tire mold. The automatic replacement of the rolling edge tire mold is realized by using the walking unit, the switching efficiency of the rolling edge tire mold is improved, and time is saved; the guide rail module in the vehicle receiving position is supported by the lifting module, the guide rail module will not be inclined or warped to cause unevenness, the positioning accuracy of the rolling edge tire mold can be improved, and reliable switching of the rolling edge tire mold is realized.

Description

Technical Field

[0001] This invention relates to the field of vehicle manufacturing equipment technology, and in particular to a rolling die switching mechanism. Background Technology

[0002] The hemming technology for four doors and two hoods of automobiles is increasingly adopted by modern automakers due to its greater flexibility and compatibility with multiple vehicle models. A single hemming workstation can be compatible with four or more vehicle models, and each model requires a dedicated hemming die. Therefore, the hemming workstation needs to switch to the appropriate die according to production requirements.

[0003] When changing molds, it is necessary to meet the requirements of high stability, high efficiency, automation and accurate positioning. Therefore, the mold changing mechanism plays a crucial role. In the past, the changing of the rolling mold was usually done manually, which took a long time and wasted operation time. Especially when the weight of the mold is 1500kg or even heavier, the mold may get stuck during the movement, making it difficult to move and the positioning accuracy is unstable, which can easily lead to failure and production line stoppage. Summary of the Invention

[0004] The purpose of this invention is to provide a rolling die switching mechanism to solve the problems of long die switching time and unstable positioning accuracy in the prior art.

[0005] To achieve the above objectives, the present invention provides a hemmed mold switching mechanism, including a support unit and a traveling unit arranged on the support unit. The traveling unit includes a traveling frame and traveling wheels arranged at the bottom of the traveling frame. The traveling frame is used to load the hemmed mold.

[0006] The support unit includes a base, a guide rail module, a mold support, a lifting module, a positioning module, and a lifting module. The lifting module includes a drive mechanism and a lifting block that is pulsatorically connected to the drive mechanism. The lifting block is used to drive the guide rail module to move vertically up and down. During the stroke of the lifting block driving its movement up and down, the guide rail module has a position that moves to the receiving position on the lifting module, a working position that moves to the positioning module, and a transition position that moves to a position higher than the receiving position. The working position is lower than the receiving position.

[0007] The mold support is arranged on the base to support the rolled edge mold when the guide rail module is in the working position. The walking wheel guide is mounted on the guide rail module. The lifting module is arranged on the base and is used to support the guide rail module when the walking unit moves on the guide rail module. The positioning module is arranged on the base to position the rolled edge mold when the guide rail module is in the working position.

[0008] Preferably, the lifting module includes a column, a support assembly, and a lifting cylinder. The bottom end of the support assembly is hinged to the top end of the column via a pivot. The cylinder body of the lifting cylinder is hinged to the column, and the telescopic rod is hinged to the support assembly. The lifting cylinder drives the support assembly to rotate around the pivot. During its rotation stroke, the support assembly has a supported state that is vertically supported on the column and an open state that is biased to one side of the column. The support assembly has support surfaces that respectively contact the guide rail module and the column. When the support assembly is in the supported state, all the support surfaces and the column are on the same vertical line.

[0009] Preferably, the support assembly includes a connecting block and a support block. The connecting block includes a connecting arm connected to the rotating shaft and a support arm perpendicular to the connecting arm. The connecting arm and the support arm form an L-shaped structure. The support block is fixedly connected to both the upper and lower ends of the support arm. The end face of the support block forms the support surface. When the support assembly is in the support state, all the support blocks and the column are vertically collinear.

[0010] Preferably, the guide rail module includes a guide rail body and a guide rail frame arranged at the bottom of the guide rail body. The guide rail frame is a frame structure formed by connecting several crossbeams and longitudinal beams. The guide rail body is arranged on the upper side of the longitudinal beams. The mold support is located on the outside of the lifting module. The mold support is located on the lower side of the longitudinal beams to vertically support the longitudinal beams. The lifting module is located on the lower side of the crossbeams to vertically support the crossbeams.

[0011] Preferably, the driving mechanism includes a drive motor, a drive belt, and a drive shaft. The output end of the drive motor is connected to the drive shaft via the drive belt, and the drive shaft is connected to the lifting block to drive the lifting block to move up and down.

[0012] Preferably, the positioning module includes a positioning seat arranged on the base and a positioning pin disposed at the top of the positioning seat, the positioning pin being used for insertion into a positioning hole on the walking unit.

[0013] Preferably, the base is further provided with a limiting mechanism, which includes pneumatic limit switches arranged at both ends of the guide rail module. The pneumatic limit switches are used to clamp the walking frame along the moving direction of the walking wheels.

[0014] Preferably, the side of the mold support is further provided with a vertical clamping mechanism, which is used to vertically clamp the walking frame.

[0015] Preferably, the base is further provided with transition rails, which are located at both ends of the rail module.

[0016] Preferably, the walking frame is further provided with positioning seats, which are arranged in a rectangular interval on the walking frame, and the walking wheels are located at the bottom of the positioning seats.

[0017] Compared with existing technologies, the hemming mold switching mechanism of this invention has the following advantages: When it is necessary to switch hemming molds, the hemming mold is loaded onto the traveling frame of the traveling unit. The traveling wheels are guided and moved on the guide rail module of the support unit, driving the traveling frame and the hemming mold on it to move, realizing automatic replacement of the hemming mold, improving the switching efficiency of the hemming mold, and saving time; when the weight of the hemming mold is too large, the lifting module first drives the guide rail module to rise to the transition position, and then drives the guide rail module to fall to the lifting module. The lifting module supports the guide rail module in the receiving position, avoiding... The lifting module eliminates the need for a lifting module to support the moving unit. The mechanical limit of the lifting module is sufficient to bear the weight of the hemming mold. When the moving unit moves to the working position on the guide rail module, the guide rail module will not be tilted or uneven due to upward or downward movement, ensuring accurate positioning. After the hemming mold moves to the working position, the lifting module drives the guide rail module to move to the working position. The mold support supports the weight of the moving unit and the hemming mold. The positioning module positions the moving frame and the hemming mold, which can improve the positioning accuracy of the hemming mold and realize reliable switching of the hemming mold. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the rolling edge mold switching mechanism of the present invention;

[0019] Figure 2 yes Figure 1 A top view of the hemming mold switching mechanism;

[0020] Figure 3 This is a three-dimensional structural diagram of the hemming mold switching mechanism of the present invention after omitting the walking unit;

[0021] Figure 4 yes Figure 3 A three-dimensional structural diagram of the hemming mold switching mechanism after omitting the guide rail module;

[0022] Figure 5 This is a schematic diagram of the lifting module of the hemmed mold switching mechanism of the present invention.

[0023] In the diagram, 1. Walking unit, 11. Walking frame, 12. Walking wheel, 13. Positioning seat, 2. Base, 21. Base plate, 22. Mechanism frame, 3. Guide rail module, 31. Guide rail body, 32. Guide rail frame, 4. Mold support, 5. Lifting module, 51. Column, 52. Lifting cylinder, 53. Connecting block, 54. Support block, 55. Rotating shaft, 6. Positioning module, 61. Positioning pin, 62. Positioning seat, 7. Lifting module, 71. Drive motor, 72. Drive belt, 73. Drive shaft, 74. Lifting block, 8. Limiting mechanism, 9. Vertical clamping mechanism, 10. Transition guide rail. Detailed Implementation

[0024] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0025] A preferred embodiment of the hemming mold switching mechanism of the present invention is as follows: Figures 1 to 5 As shown, the hemmed mold switching mechanism includes a support unit and a traveling unit 1. The traveling unit 1 is arranged on the support unit. The traveling unit 1 is used to load the hemmed mold and drive the hemmed mold to move. The support unit is used to support the stable movement of the traveling unit 1.

[0026] The traveling unit 1 includes a traveling frame 11 and traveling wheels 12. The traveling frame 11 is used to load the hemming mold, and the traveling wheels 12 are arranged at the bottom of the traveling frame 11. The traveling wheels 12 guide the traveling unit and drive the traveling frame 11 and the hemming mold on it to move. The traveling wheels 12 are equipped with motors that can drive them to move independently. The movement process is controlled by a PLC and stops after reaching a predetermined position.

[0027] The support unit includes a base 2, a guide rail module 3, a mold support 4, a lifting module 5, a positioning module 6, and a lifting module 7. The base 2 is used to support the ground or workbench and to support the overall structure. The base 2 includes a base plate 21 and a mechanism frame 22. The base plate 21 has a rectangular structure and is used to fix it to the ground or workbench. The mechanism frame 22 is fixedly arranged on the surface of the base plate 21. The guide rail module 3, the lifting module 5, and the lifting module 7 can be arranged within the space enclosed by the mechanism frame 22.

[0028] The walking wheels 12 of the walking unit 1 are guided and mounted on the guide rail module 3, which is used to limit the direction of movement of the walking unit 1. The lifting module 7 is arranged on the base 2 and located below the guide rail module 3. The lifting module 7 is used to drive the guide rail module 3 to move in the vertical direction to adjust the position of the guide rail module 3 and change the structure supporting the guide rail module 3 to adapt to the stability requirements of the guide rail module 3 under different conditions.

[0029] The lifting module 7 includes a drive mechanism and a lifting block 74. The drive mechanism is connected to the lifting block 74 to drive the lifting block 74 to move vertically. During the lifting process, the lifting block 74 can drive the guide rail module 3 to move vertically, adjusting the height of the guide rail module 3. In this embodiment, there are four lifting blocks 74, which are distributed in a rectangular interval to provide multi-point support for the guide rail module 3, increasing the stability of the guide rail module 3 during vertical lifting.

[0030] The guide rail module 3 has three positions during its vertical lifting stroke. When the guide rail module 3 moves vertically onto the lifting module 5, it is in the receiving position. At this time, the traveling unit 1 moves guided on the guide rail module 3, and the lifting module 5 supports the weight of the traveling unit 1 and the rolling mold on it. When the traveling unit 1 has moved to the working position on the guide rail module 3, the guide rail module 3 moves vertically onto the positioning module 6. At this time, the guide rail module 3 is in the working position, and the positioning module 6 supports and positions the traveling unit 1 and the rolling mold on it, ensuring accurate positioning of the rolling mold. When the guide rail module 3 moves to a position higher than the receiving position, it is in the transition position. In this position, the guide rail module 3 supports the weight of the traveling unit 1 and the rolling mold on it. At this time, the traveling unit 1 has not moved onto the guide rail module 3 or the traveling unit 1 is stationary on the guide rail module 3.

[0031] The lifting module 5 is arranged on the base 2. It supports the guide rail module 3 when the walking unit 1 moves on it. Specifically, when the guide rail module 3 is in the receiving position, the lifting module 5 supports the weight of the walking unit 1 and the rolling die. The lifting module 7 itself is strong enough to withstand the weight of the walking unit 1 and the rolling die. When the die's weight is 1500 kg or even heavier, although the lifting module 7, composed of the drive mechanism and the lifting block 74, has sufficient power to support the weight of the walking unit 1 and the rolling die, due to its structural characteristics, it can only achieve stable lifting when the rolling die is fully on the guide rail module 3 and its center of gravity is in the middle. Otherwise, due to the influence of the drive mechanism and transmission components, the guide rail module 3 may tilt or rise, and the walking unit 1 cannot guarantee its stability during movement. Therefore, the lifting mechanism is set up to support the guide rail module 3 when it is in the receiving position, bearing the weight of the walking unit 1 and the rolling die, thus ensuring the stability and balance of the walking unit 1.

[0032] The mold support 4 is arranged on the base 2. Several mold supports are arranged at intervals along the length and width of the base 2. When the guide rail module 3 is in the working position, the hemmed mold has moved to the working position. The mold support 4 is used to vertically support the weight of the traveling unit 1 and the hemmed mold, ensuring the stability of the mold during operation. The positioning module 6 is arranged on the base 2. When the guide rail module 3 is in the working position, the hemmed mold has moved to the working position. The positioning module 6 accurately positions the hemmed mold, ensuring the positioning accuracy of the hemmed mold.

[0033] When it is necessary to switch the hemming mold, the hemming mold is loaded onto the traveling frame 11 of the traveling unit 1. The traveling wheels 12 are guided and moved on the guide rail module 3 of the support unit, driving the traveling frame 11 and the hemming mold on it to move, realizing automatic replacement of the hemming mold, improving the switching efficiency of the hemming mold and saving time. When the weight of the hemming mold is too large, the lifting module 7 first drives the guide rail module 3 to rise and move to the transition position, and then drives the guide rail module 3 to fall and move to the lifting module 5. The lifting module 5 supports the guide rail module 3 in the receiving position, avoiding the need to use the lifting module 7 to support the moving position. In the current state, the walking unit 1 and the lifting module 5 are mechanically limited and can support the weight of the hemming mold. When the walking unit 1 moves to the working position on the guide rail module 3, the guide rail module 3 will not be tilted or uneven due to tilting or descent, ensuring accurate positioning. After the hemming mold moves to the working position, the lifting module 7 drives the guide rail module 3 to move to the working position. The mold support 4 supports the weight of the walking unit 1 and the hemming mold. The positioning module 6 positions the walking frame 11 and the hemming mold, which can improve the positioning accuracy of the hemming mold and realize reliable switching of the hemming mold.

[0034] Preferably, the lifting module 5 includes a column 51, a support assembly, and a lifting cylinder 52. The bottom end of the support assembly is hinged to the top end of the column 51 via a pivot 55. The cylinder body of the lifting cylinder 52 is hinged to the column 51, and the telescopic rod is hinged to the support assembly. The lifting cylinder 52 is used to drive the support assembly to rotate around the pivot 55. During the rotation stroke, the support assembly has a supported state that is vertically supported on the column 51 and an open state that is biased to one side of the column 51. The support assembly has support surfaces that contact the guide rail module 3 and the column 51 respectively. When the support assembly is in the supported state, all support surfaces and the column 51 are on the same vertical line.

[0035] The lifting cylinder 52 drives the support assembly to rotate around the rotating shaft 55, which can change the position of the support assembly and thus adjust the working state of the lifting module 5. When the support assembly rotates to the supporting state, the supporting surface of the support assembly, the column 51 and the guide rail module 3 are on the same vertical line. At this time, the position of the support assembly is mechanically limited by the column 51. The lifting cylinder 52 does not bear the weight of the hemming mold. Theoretically, as long as the material of the column 51 is sufficient and the strength of the column 51 and the support assembly is sufficient, it can bear a large amount of gravity without deformation. Therefore, the hemming mold can enter the working position under the drive of the walking unit 1 without tilting or unevenness caused by the guide rail module 3 tilting up or down.

[0036] When the support assembly rotates to the open position, it is biased towards one side of the column 51. During the switching between the supported and open positions, the height of the support assembly is at its highest point greater than the height of the guide rail module 3 at the receiving position and at its lowest point lower than the height of the mold support 4. The lifting module 7 can drive the guide rail module 3 to rotate to the transition position first, providing space for the rotation of the support assembly, and then lower it to the working position or the receiving position, using the mold support 4 or the lifting module 5 to support the weight of the rolled mold.

[0037] There are four sets of lifting modules 5, which are arranged in a rectangular interval on the base 2. They can simultaneously support the guide rail modules 3, achieving a stable and reliable operation. The lifting modules 5 change state by driving the support components through the lifting cylinders 52. The structure is simple, stable, and reliable, with fewer action logic steps, reducing switching time and achieving stable support for the guide rail modules 3.

[0038] Preferably, the support assembly includes a connecting block 53 and a support block 54. The connecting block 53 includes a connecting arm connected to the rotating shaft 55 and a support arm perpendicular to the connecting arm. The connecting arm and the support arm form an L-shaped structure. The upper and lower ends of the support arm are fixedly connected to the support block 54. The end face of the support block 54 forms a support surface. When the support assembly is in the support state, all support blocks 54 and the column 51 are vertically collinear.

[0039] The connecting arm and support arm of the connecting block 53 are in an L-shape. The support arm is equipped with a support block 54 to support the guide rail module 3. The support height and the angle of the support arm can be adjusted by adjusting the number of support blocks 54, so that the support block 54, the support arm and the column 51 are always vertically collinear, ensuring that the lifting cylinder 52 does not bear the weight of the rolling mold.

[0040] Preferably, the guide rail module 3 includes a guide rail body 31 and a guide rail frame 32 arranged at the bottom of the guide rail body 31. The guide rail frame 32 is a frame structure formed by connecting several cross beams and longitudinal beams. The guide rail body 31 is arranged on the upper side of the longitudinal beams. The mold support 4 is located on the outer side of the lifting module 5. The mold support 4 is located on the lower side of the longitudinal beams to vertically support the longitudinal beams. The lifting module 5 is located on the lower side of the cross beams to vertically support the cross beams.

[0041] There are two guide rail bodies 31, arranged at intervals. The guide rail frame 32 is a frame structure formed by crossbeams and longitudinal beams, which can reduce the weight of the guide rail module 3 and allow the two guide rail bodies 31 to rise and fall synchronously. In addition, the crossbeams and longitudinal beams provide different support positions for the mold support 4 and the lifting module 5, increasing the arrangement space for the mold support 4 and the lifting module 5, avoiding mutual interference, and also ensuring that the guide rail module 3 can switch between the working position and the receiving position during lifting by setting the height of the crossbeams and longitudinal beams.

[0042] Preferably, the drive mechanism includes a drive motor 71, a drive belt 72, and a drive shaft 73. The output end of the drive motor 71 is connected to the drive shaft 73 via the drive belt 72. The drive shaft 73 is connected to the lifting block 74 to drive the lifting block 74 to move up and down.

[0043] The drive motor 71 drives the drive shaft 73 to rotate via the drive belt 72, which in turn drives the lifting block 74 to rise and fall. The drive motor 71 has high power and can support the weight of the hemming mold. In this embodiment, there are four drive shafts 73, which are connected by drive belts 72 and rotate synchronously, ensuring that the four lifting blocks 74 rise and fall synchronously. This allows the guide rail module 3 to rise and fall stably and ensures balance during the lifting process. The specific transmission relationship between the lifting block 74 and the drive shaft 73 can be achieved using a worm gear mechanism, the specific structure of which is existing technology and will not be described in detail here.

[0044] Preferably, the positioning module 6 includes a positioning seat 13 arranged on the base 2 and a positioning pin 61 disposed at the top of the positioning seat 13. The positioning pin 61 is used to insert and cooperate with the positioning hole on the walking unit 1.

[0045] The positioning pin 61 is arranged at the top of the positioning seat 13. It positions the walking unit 1 by inserting and cooperating with the positioning hole on the walking unit 1. Both the positioning pin 61 and the positioning seat 13 are fixed structures. Their positions are fixed and they have good rigidity, which can ensure that the guide rail module 3 has high repeatability positioning accuracy each time it descends.

[0046] In this embodiment, the positioning seat 13 is a rectangular column structure, which uses its own mechanical structural strength to support and position the guide rail module 3.

[0047] Preferably, a limiting mechanism 8 is also provided on the base 2. The limiting mechanism 8 includes pneumatic limit switches arranged at both ends of the guide rail module 3. The pneumatic limit switches are used to clamp the walking frame 11 along the moving direction of the walking wheel 12.

[0048] The limiting mechanism 8 is located at both ends of the guide rail body 31 along its length. When the traveling unit 1 moves to the working position on the guide rail body 31, the pneumatic limit switches at both ends are simultaneously activated and press against the traveling frame 11, thereby fixing the position of the traveling frame 11 and ensuring the accurate positioning of the hemming mold. In this embodiment, the pneumatic limit switch is specifically a cylinder and a limiting plate. The cylinder drives the limiting plate to move horizontally to clamp the traveling frame 11 horizontally and achieve the limiting.

[0049] Preferably, the side of the mold support 4 is also provided with a vertical clamping mechanism 9, which is used to vertically clamp the traveling frame 11.

[0050] When the guide rail module 3 moves to the working position, the hemmed mold is in the working position, and the vertical clamping mechanism 9 presses the traveling frame 11 vertically to ensure that the traveling frame 11 does not shake vertically, thereby positioning the traveling frame 11. Each mold support 4 is equipped with a vertical clamping mechanism 9 to limit the traveling frame 11 at multiple points. In this embodiment, the vertical clamping mechanism 9 is specifically a vertical quick clamp.

[0051] Preferably, the base 2 is also provided with a transition rail 10, which is located at both ends of the rail module 3.

[0052] The guide rail body 31 of the guide rail module 3 is segmented from other guide rail sections to enable the guide rail module 3 to switch between transition positions, receiving positions, and working positions. Transition guide rails 10 are provided at both ends of the guide rail body 31 of the guide rail module 3 to facilitate the movement of the traveling unit 1 between the guide rail body 31 and other guide rail sections.

[0053] Preferably, the walking frame 11 is also provided with positioning seats 13, which are arranged in a rectangular interval on the walking frame 11, and the walking wheels 12 are located at the bottom of the positioning seats 13.

[0054] The positioning seat 13 is fixedly arranged on the traveling frame 11, which is a plate structure. The positioning seat 13 is used to position the traveling wheel 12.

[0055] The working process of this invention is as follows:

[0056] When it is necessary to switch the rolling edge mold, the drive motor 71 of the lifting module 7 drives the drive shaft 73 to rotate through the drive belt 72, controls the lifting block 74 to rise and drives the guide rail module 3 to rise to the transition position, and the lifting cylinder 52 drives the support component to rotate around the rotating shaft 55, and the support component changes from the open state to the support state.

[0057] The drive motor 71 drives the drive shaft 73 to rotate via the drive belt 72, controls the lifting block 74 to descend and drives the guide rail module 3 to descend to the receiving position. The guide rail module 3 descends and is supported on the lifting module 5. The column 51, support block 54 and guide rail frame 32 of the lifting module 5 are vertically collinear, supporting the guide rail module 3.

[0058] The walking wheel 12 of the walking unit 1 is guided to move on the guide rail body 31. The walking frame 11 drives the hemmed mold to move to the working position. After the hemmed mold moves into place, the lifting module 7 drives the guide rail module 3 to rise to the transition position. The lifting cylinder 52 drives the support component to rotate around the rotating shaft 55, and the support component changes from the open state to the support state.

[0059] The drive motor 71 drives the drive shaft 73 to rotate via the drive belt 72, controls the lifting block 74 to descend and drives the guide rail module 3 to descend to the working position. The guide rail module 3 descends and supports the mold support 4, driving the walking unit 1 and the rolled edge mold on it to descend synchronously. After the walking unit 1 descends and the positioning pin 61 is inserted into the positioning hole, the positioning seat 13 supports the walking unit 1. The pneumatic limit switch clamps the walking frame 11 along the direction of the guide rail body 31. The vertical clamping mechanism 9 clamps the walking frame 11 vertically, accurately positioning the walking unit 1 and the rolled edge mold on it, completing the mold switching operation.

[0060] In summary, this invention provides a hemming mold switching mechanism. When a hemming mold needs to be switched, the hemming mold is loaded onto the traveling frame of the traveling unit. The traveling wheels are guided and moved on the guide rail module of the support unit, driving the traveling frame and the hemming mold on it to move, thus realizing automatic replacement of the hemming mold, improving the switching efficiency of the hemming mold and saving time. When the weight of the hemming mold is too large, the lifting module first drives the guide rail module to rise to the transition position, and then drives the guide rail module to fall to the lifting module. The lifting module supports the guide rail module in the receiving position, avoiding the need for lifting... The lowering module supports the moving unit, while the lifting module has mechanical limits to support the weight of the hemming mold. When the moving unit moves to the working position on the guide rail module, the guide rail module will not tilt or become uneven due to tilting or descent, ensuring accurate positioning. After the hemming mold moves to the working position, the lifting module drives the guide rail module to move to the working position. The mold support supports the weight of the moving unit and the hemming mold. The positioning module positions the moving frame and the hemming mold, improving the positioning accuracy of the hemming mold and enabling reliable switching of the hemming mold.

[0061] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A hemming mold switching mechanism, characterized in that, The support unit comprises a base, a guide rail module, a tire mold support, a lifting module, a positioning module and a lifting module, the lifting module comprises a driving mechanism and a lifting block in transmission connection with the driving mechanism, the lifting block is used to drive the vertical lifting of the guide rail module, the guide rail module has a tire receiving position on the lifting module, a working position on the positioning module and a transition position higher than the tire receiving position in the lifting stroke of the lifting block, and the working position is lower than the tire receiving position; The tire mold support is arranged on the base to support the edge rolling tire mold when the guide rail module is in the working position, the walking wheel is guided and assembled on the guide rail module, the lifting module is arranged on the base, the lifting module is used to support the guide rail module when the walking unit moves on the guide rail module, and the positioning module is arranged on the base to position the edge rolling tire mold when the guide rail module is in the working position. The lifting module comprises a column, a support assembly and a lifting cylinder, the bottom end of the support assembly is hinged with the top end of the column through a rotating shaft, the cylinder body of the lifting cylinder is hinged with the column, and the telescopic rod is hinged with the support assembly, the lifting cylinder is used to drive the rotating of the support assembly around the rotating shaft, the support assembly has a supporting state of vertical supporting on the column and an opening state of deviating to one side of the column in the rotating stroke, the support assembly has a supporting surface in contact with the guide rail module and the column respectively, and the supporting surface and the column are in the same vertical line when the support assembly is in the supporting state. The support assembly comprises a connecting block and a supporting block, the connecting block comprises a connecting arm connected with the rotating shaft and a supporting arm perpendicular to the connecting arm, the connecting arm and the supporting arm form an L-shaped structure, the upper and lower ends of the supporting arm are fixedly connected with the supporting blocks, the end faces of the supporting blocks form the supporting surfaces, and the supporting blocks and the column are vertically collinear when the support assembly is in the supporting state. The guide rail module comprises a guide rail body and a guide rail frame arranged at the bottom of the guide rail body, the guide rail frame is a frame structure formed by connecting a plurality of cross beams and longitudinal beams, the guide rail body is arranged on the upper side of the longitudinal beam, the tire mold support is located on the outer side of the lifting module, and the tire mold support is located on the lower side of the longitudinal beam to vertically support the longitudinal beam.

2. The turn around mechanism for a serging bed-jack as defined in claim 1, wherein, The driving mechanism comprises a driving motor, a driving belt and a driving shaft, the output end of the driving motor is in transmission connection with the driving shaft through the driving belt, and the driving shaft is in transmission connection with the lifting block to drive the lifting block to lift.

3. The turn around mechanism for a serging bed-jack as defined in claim 1, wherein, The positioning module comprises a positioning seat arranged on the base and a positioning pin arranged at the top end of the positioning seat, and the positioning pin is used for plug-in cooperation with the positioning hole on the walking unit.

4. The turn around mechanism for a serging bed-jack as defined in claim 1, wherein, ​ 5. The turn of mill form change mechanism of claim 1 wherein, The base is further provided with a limiting mechanism, which comprises pneumatic limiting switches arranged at two ends of the guide rail module, and the pneumatic limiting switches are used for clamping the walking frame along the moving direction of the walking wheels.

6. The turn of mill form change mechanism of claim 1 wherein, The side of the tire mold support is further provided with a vertical clamping mechanism, which is used for vertically clamping the walking frame.

7. The turn of mill form change mechanism of claim 1 wherein, The base is further provided with a transition guide rail, which is located at two ends of the guide rail module.

8. The turn of mill form change mechanism of claim 1 wherein, The walking frame is further provided with positioning seats, which are arranged in a rectangular interval on the walking frame, and the walking wheels are arranged at the bottom of the positioning seats.

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