CN219457684U - Roll core shaping equipment - Google Patents

Abstract

The utility model relates to core shaping equipment, which comprises a first shaping module and a second shaping module, wherein the first shaping module comprises a first base and a first shaping die which is elastically arranged on the first base, the first shaping die is provided with a conical first accommodating cavity, the first base drives the first shaping die to move towards a core, and the end part of the core is spliced in the first accommodating cavity; the second plastic module sets up in the low reaches of first plastic module, and the second plastic module includes second base and elasticity setting up the second plastic mould on the second base, and the second plastic mould is provided with and is columniform second and hold the chamber, and the second base drive the second plastic mould moves towards the core to make the tip of core peg graft in the second and hold the intracavity, the second plastic module is used for carrying out the secondary plastic to the core at the low reaches of first plastic module. The roll core shaping equipment can shape the roll core twice, so that the roll core can be assembled smoothly.

Description

Roll core shaping equipment

Technical Field

The utility model relates to the technical field of battery manufacturing, in particular to roll core shaping equipment.

Background

With the rapid development of new energy power, a power battery has become a main direction of development of electric automobiles. In the production process of the power battery, a winding type battery cell and a lamination type battery cell are mainly adopted. In the process of manufacturing the winding type battery cell, a certain number of pole pieces are wound into a cylindrical shape to form a winding core, the winding core is transported to an assembling process, and then the winding core is assembled into a housing of the battery. In order to shape the wound core so that it retains a cylindrical shape, the core is wound with tape after winding to avoid the unwinding of the layers of pole pieces. After the adhesive tape is wound, the end part of the adhesive tape protrudes out of the end surface of the winding core, and is affected by vibration during transportation and air flow, so that the end part of the adhesive tape is easy to turn outwards, deform and the like, and the end surface of the winding core is not beneficial to flattening treatment. Meanwhile, the situation that the adhesive tape is not pressed on the surface of the winding core can occur, so that the adhesive tape protrudes out of the peripheral surface of the winding core, the whole contour of the winding core is deformed, and the winding core cannot be smoothly arranged in the shell.

Disclosure of Invention

The utility model aims to provide a roll core shaping device which can shape a roll core twice so as to facilitate the smooth assembly of the roll core.

To achieve the purpose, the utility model adopts the following technical scheme:

provided is a roll core shaping apparatus including:

the first shaping module comprises a first base moving along the axial direction of the winding core and a first shaping die elastically arranged on the first base, the first shaping die is provided with a conical first accommodating cavity, the first base drives the first shaping die to move towards the winding core, and the end part of the winding core is spliced in the first accommodating cavity;

the second plastic module, its set up in the low reaches of first plastic module, the second plastic module include follow the axis direction of roll up the core move second base and elasticity set up in second plastic mould on the second base, second plastic mould is provided with and is columniform second and hold the chamber, the second base drive the second plastic mould orientation roll up the core motion, and make the tip of roll up the core peg graft in the second holds the intracavity, the second plastic module is used for the low reaches of first plastic module is right it carries out the secondary plastic to roll up the core.

Further, the first accommodating cavity comprises a large end and a small end which are opposite, the winding core is inserted into the first accommodating cavity from the large end of the first accommodating cavity, and the diameter of the small end of the first accommodating cavity is smaller than that of the winding core.

Further, the cavity wall of the first accommodating cavity is of an arc surface structure.

Further, the diameter of the second accommodating cavity is larger than or equal to the diameter of the winding core.

Further, the second accommodating cavity is provided with a first end and a second end which are opposite, the first end of the second accommodating cavity is provided with an opening for the winding core to be inserted, the second end of the second accommodating cavity is provided with a baffle, and when the winding core is inserted into the second accommodating cavity, the end face of the winding core can be abutted to the baffle.

Further, a first air cylinder is arranged on the first base, and the first shaping die is arranged at the output end of the first air cylinder, so that the first shaping die is elastically connected with the first base through the first air cylinder; and/or the number of the groups of groups,

the second base is provided with a second air cylinder, and the second shaping die is arranged at the output end of the second air cylinder, so that the second shaping die is elastically connected with the second base through the second air cylinder.

Further, compress tightly the module and include the third base that sets up along vertical direction motion, elasticity is provided with the briquetting on the third base, the briquetting is used for with the core compresses tightly on the transport module.

Further, a third cylinder is arranged on the third base, and the pressing block is arranged at the output end of the third cylinder, so that the pressing block is elastically connected with the third base through the third cylinder.

Further, along the conveying direction of the winding core, a plurality of first shaping dies are arranged on the first base at intervals, and/or a plurality of second shaping dies are arranged on the second base at intervals.

Further, roll up core plastic equipment still includes transport module, compresses tightly the module and presses gluey subassembly, transport module is used for transporting roll up the core, compress tightly the module and be used for right it is spacing fixed to roll up core shape, press gluey subassembly to be located first plastic module with between the second plastic module, press gluey subassembly is used for with roll up the terminal surface flattening of core.

Compared with the prior art, the utility model has the beneficial effects that:

according to the roll core shaping equipment, the first shaping module and the second shaping module are respectively arranged at the upstream and the downstream of the roll core in the conveying direction of the roll core, so that the roll core is shaped twice. The first shaping uses the conical cavity wall of the first shaping die to bend the protruding tape so as to flatten the end of the tape against the end face of the winding core. And (3) carrying out secondary shaping by utilizing the cylindrical cavity wall of the second shaping die to level the adhesive tape which is not pressed on the periphery of the winding core, so as to ensure the external profile composite design requirement of the winding core, and smoothly assembling the winding core into the shell. Simultaneously, set up first plastic mould and second plastic mould elasticity to make the core atress constantly when the plastic, avoid the core to take place to warp, damage because of the pressure is too big when the plastic.

Drawings

Fig. 1 is a schematic diagram of a primary shaping station of a core shaping apparatus according to an embodiment of the present utility model.

Fig. 2 is an enlarged view at a in fig. 1.

Fig. 3 is a schematic diagram of a secondary shaping station of a core shaping apparatus according to an embodiment of the present utility model.

Fig. 4 is an enlarged view at B in fig. 3.

Fig. 5 is a schematic diagram of a first shaping module according to an embodiment of the utility model.

Fig. 6 is a schematic view of a first shaping mold according to an embodiment of the present utility model.

Fig. 7 is a schematic diagram of a second shaping module according to an embodiment of the utility model.

Fig. 8 is a cross-sectional view of a second shaping die of an embodiment of the present utility model.

In the figure:

1. a first shaping module; 11. a first shaping mold; 111. a first accommodation chamber; 12. a first base; 13. a first cylinder; 14. a first driving member; 15. a first slider; 16. a first guide rail; 2. a second shaping module; 21. a second shaping mold; 211. a second accommodation chamber; 212. a baffle; 22. a second base; 23. a second cylinder; 24. a second driving member; 25. a second slider; 26. a second guide rail; 3. a conveying module; 31. a magnetic suspension base; 32. a jig; 4. a compacting module; 41. briquetting; 42. a third base; 43. a third cylinder; 44. a third driving member; 45. a third slider; 46. a third guide rail; 5. a winding core; 51. an adhesive tape; 52. an end face.

Detailed Description

In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the utility model more clear, the technical scheme of the utility model is further described below by a specific embodiment in combination with the attached drawings.

As shown in fig. 1 to 8, the shaping device for a winding core is provided in the present utility model, which is used for shaping the winding core 5, so that the external contour of the winding core 5 can be matched with the cavity inside the casing, and the winding core 5 can be smoothly installed in the casing. The winding core 5 is used for converting chemical energy into electric energy, the winding core 5 is formed by winding a plurality of pole pieces and diaphragms in a certain sequence, and the winding core 5 after winding is cylindrical. The wound winding core 5 is attached with a layer of adhesive tape 51 on the outside of the pole piece. The whole winding core 5 is kept in a cylindrical outline by the adhesive tape 51, i.e. the adhesive tape 51 performs a shaping function on the winding core 5. After the tape 51 is wound around the outside of the pole piece of the winding core 5, the end of the tape 51 protrudes from the end face 52 of the winding core 5. The core shaping device is used for shaping the adhesive tape 51, enabling the adhesive tape 51 to be attached to the surface of a pole piece in the core 5, and enabling the whole core 5 to keep a circular structure so as to facilitate the insertion of the core 5 into a shell.

The roll core shaping equipment comprises a first shaping module 1, a second shaping module 2, a conveying module 3 and a compacting module 4. The conveying module 3 is used for conveying the winding cores 5, and the conveying module 3 conveys the winding cores 5 to each processing station. After the winding core 5 is rubberized (the adhesive tape 51 is wound), the conveying module 3 sequentially conveys the winding core 5 to a primary shaping station and a secondary shaping station. The first shaping module 1 is arranged at the upstream of the conveying direction of the winding core 5, namely, the first shaping module 1 is positioned on a primary shaping station, and the first shaping module 1 is used for carrying out primary shaping treatment on the winding core 5 stopped on the primary shaping station. The first shaping module 1 comprises a first base 12 movably arranged, wherein the first base 12 can move along the axial direction of the winding core 5, so that the first base 12 can be close to or far from the end surface 52 of the winding core 5. The first base 12 is elastically provided with a first shaping die 11, and one end of the first shaping die 11 facing the winding core 5 is provided with a first accommodation cavity 111 having a conical shape. When the first base 12 drives the first shaping die 11 toward the winding core 5, the end of the winding core 5 can be inserted into the first accommodation chamber 111. The first shaping die 11 presses the adhesive tape 51 protruding from the end surface 52 with a conical cavity wall, so that the end of the adhesive tape 51 is bent toward the axial direction of the winding core 5, so that the end of the adhesive tape 51 is flattened and attached to the end surface 52 with a glue pressing assembly.

The second shaping module 2 is arranged at the downstream of the conveying direction of the winding core 5, namely, the second shaping module 2 is positioned on the secondary shaping station, and the second shaping module 2 is used for carrying out secondary shaping treatment on the winding core 5 stopped at the secondary shaping station. The second shaping module 2 comprises a second base 22 movably arranged, and the second base 22 can move along the axial direction of the winding core 5, so that the second base 22 can be close to or far from the end surface 52 of the winding core 5. The second base 22 is elastically provided with a second shaping die 21, and one end of the second shaping die 21 facing the winding core 5 is provided with a cylindrical second accommodating cavity 211. When the second base 22 drives the second shaping die 21 toward the winding core 5, the end of the winding core 5 can be inserted into the second accommodation chamber 211. The second accommodating cavity 211 is matched with the winding core 5 in size, and the second shaping die 21 shapes the periphery of the winding core 5 by using a cylindrical cavity wall, so that the adhesive tape 51 at the periphery of the winding core 5 is tightly attached to the outside of the wound pole piece, and the outer contour of the whole winding core 5 is matched with the cavity in the shell, so that the winding core 5 is subsequently arranged in the shell.

The number of the compaction modules 4 is two, and the two compaction modules 4 are respectively arranged on the primary shaping station and the secondary shaping station. The compaction module 4 is used for limiting and fixing the winding cores 5 respectively stopped at the primary shaping station and the secondary shaping station, so that the winding cores 5 are prevented from moving in the shaping treatment process.

It can be understood that the first shaping module 1 and the second shaping module 2 are respectively arranged at the upstream and downstream of the conveying direction of the winding core 5, so as to perform twice shaping on the winding core 5. The first shaping uses the conical cavity wall of the first shaping die 11 to bend the protruding tape 51 so as to flatten the end of the tape 51 against the end face 52 of the winding core 5. The second shaping utilizes the cylindrical cavity wall of the second shaping die 21 to straighten the adhesive tape 51 which is not pressed at the periphery of the winding core 5, so as to ensure the composite design requirement of the outer contour of the winding core 5, and facilitate the smooth insertion of the winding core 5 into the shell.

Alternatively, referring to fig. 1 to 4, the conveying direction of the winding cores 5 is the illustrated X-direction. The conveying module 3 comprises a magnetic suspension base 31 and a jig 32 arranged on the magnetic suspension base 31. The winding core 5 is mounted on the jig 32. The magnetic suspension base 31 moves by utilizing the magnetic suspension principle, a plurality of jigs 32 are arranged on the magnetic suspension base 31, and the jigs 32 are distributed at intervals along the conveying direction of the winding cores 5, so that the winding cores 5 on the jigs 32 can be simultaneously shaped on one shaping station, and the improvement of the working efficiency is facilitated. The compacting module 4 is located above the primary shaping station, and after the conveying module 3 is stopped at the primary shaping station, the conveying module 3 is located below the compacting module 4. The pressing module 4 includes a pressing block 41, a third base 42, a third cylinder 43, a third driving member 44, a third slider 45, and a third guide rail 46. The third base 42 plays a role in supporting integrally, the third base 42 is movably disposed on the bracket, and the third driving member 44 is connected with the third base 42, so that the third driving member 44 can drive the third base 42 to move along the vertical direction. The third rail 46 and the third cylinder 43 are fixedly installed on the third base 42, and the third slider 45 is slidably disposed on the third rail 46, and the third rail 46 extends in the vertical direction so that the third slider 45 can slide in the vertical direction along the third rail 46. The output end of the third cylinder 43 is connected to the third slider 45, and the pressing block 41 is mounted on the third slider 45. The pressing block 41 is provided with a groove matched with the surface of the winding core 5, and the pressing block 41 is used for pressing the winding core 5 on the conveying module 3 so as to prevent the winding core 5 from moving during shaping. The third cylinder 43 plays a role of elasticity so that the pressing block 41 can be elastically coupled with the third base 42 through the third cylinder 43.

It will be appreciated that when the third base 42 moves downwards, the press block 41 abuts the winding core 5. After the pressing block 41 abuts against the winding core 5, the third base 42 continues to move toward the winding core 5, so that the winding core 5 pushes the pressing block 41 and the third slider 45 to move toward the third cylinder 43, and compresses the gas in the third cylinder 43. The structure enables the acting force of the pressing block 41 on the winding core 5 to be generated through the third air cylinder 43, so that the acting force of the pressing block 41 on the winding core 5 can be adjusted by controlling the air quantity in the third air cylinder 43, and the winding core 5 is prevented from being crushed due to overlarge stress. Of course, in other embodiments, a spring may be used instead of the third cylinder 43, and the spring force of the spring is used to provide a downward pressing force to the winding core 5.

Similarly, when the conveying module 3 is stopped at the secondary shaping station, the pressing module 4 positioned at the secondary shaping station presses the winding core 5 on the conveying module 3.

Referring to fig. 1 and 5, the first shaping die set 1 includes a first shaping die 11, a first base 12, a first cylinder 13, a first driver 14, a first slider 15, and a first guide rail 16. The first base 12 plays a role in supporting integrally, the first base 12 is movably disposed on the bracket, and the first driving member 14 is connected with the first base 12, so that the first driving member 14 can drive the first base 12 to move in a horizontal direction, that is, the first base 12 moves in a Y direction in the drawing, so that the first base 12 moves in an axial direction of the winding core 5. The first guide rail 16 and the first cylinder 13 are fixedly installed on the first base 12, the first slider 15 is slidably connected with the first guide rail 16, and the first guide rail 16 extends along the axial direction of the winding core 5, so that the first slider 15 can slide along the first guide rail 16 in the horizontal direction. The output end of the first cylinder 13 is connected with a first slide 15, and the first shaping die 11 is mounted on the first slide 15. The first cylinder 13 plays a role of elasticity so that the first shaping mold 11 can be elastically connected with the first base 12 through the first cylinder 13. The structure and function of the first cylinder 13 are the same as those of the third cylinder 43, and will not be described again here.

Referring to fig. 5 and 6, the first shaping die 11 is provided with a first receiving cavity 111 for insertion with one end of the winding core 5, the first receiving cavity 111 being conical, i.e. the first receiving cavity 111 has opposite large and small ends, the diameter of the large end of the first receiving cavity 111 being larger than the diameter of the small end. The cavity wall of the first accommodating cavity 111 is of an arc surface structure. When the first shaping die 11 moves toward the winding core 5, one end of the winding core 5 is inserted into the first accommodating chamber 111 from the large end of the first accommodating chamber 111. After the winding core 5 enters the first accommodating cavity 111, the adhesive tape 51 positioned at the end of the winding core 51 can be abutted against the cavity wall of the first accommodating cavity 111, and the end of the adhesive tape 51 is bent towards the axis direction of the winding core 5 under the action of the conical cavity wall. Specifically, the diameter of the small end of the first housing cavity 111 is smaller than the diameter of the winding core 5 to ensure that the end position of the winding core 5 can abut against the cavity wall of the first housing cavity 111.

Optionally, the roll core shaping device further comprises a glue pressing assembly, wherein the glue pressing assembly is located between the first shaping module 1 and the second shaping module 2 and is used for flattening the end face of the roll core 5. It will be appreciated that after one shaping of the winding core 5, the adhesive tape 51 in its end position is folded to a side close to the end face 52 of the winding core 5. The glue-pressing assembly applies pressure to the end face 52 of the winding core 5 so that the tape 51 continues to bend towards the end face 52 of the winding core 5 and abuts against the end face 52 to flatten the end face 52 of the winding core 5.

Referring to fig. 3 and 7, the second shaping die set 2 includes a second shaping die 21, a second base 22, a second cylinder 23, a second driving member 24, a second slider 25, and a second guide rail 26. The second base 22 plays a role of integral support, the second base 22 is movably disposed on the bracket, and the second driving member 24 is connected with the second base 22, so that the second driving member 24 can drive the second base 22 to move in a horizontal direction, that is, the second base 22 moves in a Y direction as shown in the drawing, so that the second base 22 moves in an axial direction of the winding core 5. The second guide rail 26 and the second cylinder 23 are fixedly installed on the second base 22, and the second slider 25 is slidably connected to the second guide rail 26, and the second guide rail 26 extends in the axial direction of the winding core 5 so that the second slider 25 can slide in the horizontal direction along the second guide rail 26. The output end of the second cylinder 23 is connected with a second slide block 25, and the second shaping die 21 is mounted on the second slide block 25. The second cylinder 23 plays a role of elasticity so that the second shaping die 21 can be elastically connected with the second base 22 through the second cylinder 23. The structure and function of the second cylinder 23 are the same as those of the third cylinder 43, and will not be described again here.

Referring to fig. 7 and 8, the second shaping die 21 is provided with a second receiving cavity 211 for inserting one end of the winding core 5, the second receiving cavity 211 has a cylindrical shape, and the size of the second receiving cavity 211 is matched with the overall size of the winding core 5. The diameter of the second accommodating cavity 211 is larger than or equal to that of the winding core 5, so that the winding core 5 is inserted into the second accommodating cavity 211, and the peripheral part of the winding core 5 is extruded and shaped by the cavity wall of the second accommodating cavity 211, so that the adhesive tape 51 which is not pressed on the winding core 5 can be tightly attached to the peripheral part surface of the winding core 5.

Specifically, the second accommodating chamber 211 has opposite first and second ends, and the first end of the second accommodating chamber 211 is opposite to the winding core 5. When the second shaping die 21 moves toward the winding core 5, the winding core 5 is inserted into the second accommodating chamber 211 from the opening of the first end of the second accommodating chamber 211. The second section of the second accommodation chamber 211 is provided with a baffle plate 212, and the baffle plate 212 is perpendicular to the axial direction of the second accommodation chamber 211. When the winding core 5 is inserted into the second accommodating chamber 211, the end surface 52 of the winding core 5 can abut against the baffle 212. That is, the peripheral portion of the winding core 5 is shaped by the cavity wall of the second accommodation cavity 211, and the end face 52 of the winding core 5 is shaped by the baffle 212. Of course, after the primary shaping of the winding core 5, the winding core may be directly conveyed to the secondary shaping station and subjected to secondary shaping by the second shaping mold 21, and the baffle 212 is abutted against the end face 52 of the winding core 5, so that the adhesive tape 52 bent after the primary shaping can be tightly adhered to the end face 52 under the extrusion of the baffle 212. The method is beneficial to reducing the process steps and improving the production efficiency.

Optionally, along the conveying direction of the winding cores 5, a plurality of first shaping molds 11 are arranged on the first base 12 at intervals, and a plurality of second shaping molds 21 are arranged on the second base 22 at intervals, so that primary shaping treatment and secondary shaping treatment are performed on the winding cores 5 at the same time, and the working efficiency is improved.

The first shaping module 1 and the second shaping module 2 in the shaping arrangement of the winding core are used for shaping one end of the winding core 5. In practical applications, the shaping treatment can be performed on both ends of the winding core 5 by turning around the winding core 5. Of course, a set of first shaping modules 1 and a set of second shaping modules 2 can be respectively arranged at two sides of the conveying direction of the winding core 5, so as to meet the requirements of shaping the two ends of the winding core 5.

Alternatively, in the present embodiment, the first driving member 14, the second driving member 24, and the third driving member 44 are all air cylinders. Of course, in other embodiments, the first driving member 14, the second driving member 24, and the third driving member 44 may be driving devices such as a hydraulic cylinder, a linear motor, and an electric push rod.

In this embodiment, the winding core 5 includes a pole piece wound in a cylindrical shape and an adhesive tape 51 wrapped around the outside of the pole piece.

The remarkable effects of this embodiment are: the first shaping module 1 and the second shaping module 2 are respectively arranged at the upstream and downstream of the conveying direction of the winding core 5 so as to shape the winding core 5 twice. The first shaping uses the conical cavity wall of the first shaping die 11 to bend the protruding tape 51 so as to flatten the end of the tape 51 against the end face 52 of the winding core 5. The second shaping utilizes the cylindrical cavity wall of the second shaping die 21 to straighten the adhesive tape 51 which is not pressed at the periphery of the winding core 5, so as to ensure that the external contour of the winding core 5 meets the design requirement, and the winding core 5 is smoothly assembled into the shell. Simultaneously, the first shaping die 11 and the second shaping die 21 are elastically arranged, so that the stress of the winding core 5 is constant during shaping, and deformation and damage of the winding core 5 caused by overlarge pressure during shaping are avoided.

The foregoing is merely exemplary of the present utility model, and those skilled in the art should not be considered as limiting the utility model, since modifications may be made in the specific embodiments and application scope of the utility model in light of the teachings of the present utility model.

Claims (10)

1. A core shaping apparatus, comprising:

the first shaping module comprises a first base moving along the axial direction of the winding core and a first shaping die elastically arranged on the first base, the first shaping die is provided with a conical first accommodating cavity, the first base drives the first shaping die to move towards the winding core, and the end part of the winding core is spliced in the first accommodating cavity;

the second plastic module, its set up in the low reaches of first plastic module, the second plastic module include follow the axis direction of roll up the core move second base and elasticity set up in second plastic mould on the second base, second plastic mould is provided with and is columniform second and hold the chamber, the second base drive the second plastic mould orientation roll up the core motion, and make the tip of roll up the core peg graft in the second holds the intracavity, the second plastic module is used for the low reaches of first plastic module is right it carries out the secondary plastic to roll up the core.

2. The core shaping apparatus of claim 1 wherein the first receiving cavity comprises opposite major and minor ends, the core being inserted into the first receiving cavity from the major end of the first receiving cavity, the minor end of the first receiving cavity having a diameter less than the diameter of the core.

3. The core shaping apparatus of claim 2 wherein the cavity wall of the first receiving cavity is of arcuate configuration.

4. The core shaping apparatus of claim 1 wherein the diameter of the second receiving cavity is greater than or equal to the diameter of the core.

5. The core shaping apparatus of claim 4 wherein the second receiving cavity has opposite first and second ends, the first end of the second receiving cavity being provided with an opening into which the core is inserted, the second end of the second receiving cavity being provided with a baffle against which an end face of the core can abut after the core is inserted into the second receiving cavity.

6. The core shaping device of claim 1, wherein a first cylinder is disposed on the first base, and the first shaping die is disposed at an output end of the first cylinder, so that the first shaping die is elastically connected with the first base through the first cylinder; and/or the number of the groups of groups,

the second base is provided with a second air cylinder, and the second shaping die is arranged at the output end of the second air cylinder, so that the second shaping die is elastically connected with the second base through the second air cylinder.

7. Core shaping device according to any of claims 1-6, characterized in that a plurality of said first shaping moulds are arranged on said first base at intervals in the direction of transport of the core and/or a plurality of said second shaping moulds are arranged on said second base at intervals.

8. The core shaping apparatus of any one of claims 1 to 6 further comprising a transport module for transporting the core, a compression module for spacing the core, and a glue pressing assembly between the first shaping module and the second shaping module for flattening an end face of the core.

9. The winding core shaping device according to claim 8, wherein the pressing module comprises a third base movably arranged in a vertical direction, and a pressing block is elastically arranged on the third base and is used for pressing the winding core on the conveying module.

10. The winding core shaping device according to claim 9, wherein a third cylinder is provided on the third base, and the pressing block is provided at an output end of the third cylinder, so that the pressing block is elastically connected with the third base through the third cylinder.