TWM614327U - Easy-to-turn flexible metal pipe - Google Patents

Abstract

An easy-to-rotate metal flexible pipe includes a nozzle unit, and at least one includes a first pipe member, a first nut member screwed to the first pipe member, a first ball liner, a second ball liner, and An extension unit of the first ball head. The first tube member is formed with a first tube inner hole, the first nut member is formed with a first inner cavity, the first ball liner is disposed in the first tube inner hole, and has a surrounding defining a first inner cavity. A first lining surface of the lining hole, the first lining hole has a first ball groove portion, the first lining surface has a first concave arc portion defining the first ball groove portion, the first The material of the ball liner is a liquid-tight and compressible material. The second ball liner is arranged in the first inner cavity and has a second inner liner surface surrounding and defining a second inner liner hole. The backing hole has a second ball groove portion, the second inner liner has a second concave arc surface defining the second ball groove portion, and the material of the second ball liner is a liquid-tight and compressible material, The first ball head has a first head that is adjustably disposed on the first ball groove portion and the second ball groove portion, and the first head has a first inner concave arc portion and the second The inner concave arc surface frictionally contacts the first outer convex arc surface, the first ball head can be operated to rotate relative to the first ball liner and the second ball liner, and the first ball head is connected with the nozzle unit.

Description

Easy-to-turn metal flexible pipe

The present invention relates to a flexible tube, in particular to a flexible metal tube that is easy to rotate.

As shown in FIG. 1, a conventional plastic universal guide tube 1 used in a processing machine and capable of pressurized injection of liquid includes a number of pipes 101 connected in series with each other, and a pipe set at the front end of the pipes 101 The nozzle 102, each pipe piece 101 has a head 103 and a socket 104, the head 103 of one of any two adjacent pipes 101 is rotatably connected with the socket 104 of the other, so , The plastic universal guide tube 1 can be arbitrarily adjusted according to the needs of the steering, but in actual use, because the material of the pipe fittings 101 is plastic, therefore, this kind of plastic universal guide tube 1 cannot withstand high pressure. Moreover, the length of the plastic universal guide tube 1 is generally customized and has a fixed length, and cannot be extended or shortened arbitrarily according to the specific position between the actual machine and the workpiece to be processed. It is not convenient.

As shown in Figure 2, it is a conventional metal universal guide tube 2 (Taiwan New Patent No. M553390) for processing machines and capable of pressurized injection of liquids. It contains several limit adjustment components 3 that can be connected in series. , Each limit adjustment component 3 includes a metal ball 4, a metal front limit piece 5, and a metal rear limit piece 6, the metal ball 4 is disposed on the metal front limit piece 5 and the metal back There is a convex spherical arc surface 401 between the limiting members 6, the metal front limiting member 5 has a front concave spherical arc surface 501 that can abut against the convex spherical arc surface 401, and the rear is the front limiting member 6 has a rear concave spherical arc surface 601 that can abut against the convex spherical arc surface 401. When the metal front limiting member 5 and the metal rear limiting member 6 are locked, the front concave spherical arc 501 and the metal rear limiting member 6 are locked. The back concave spherical arc surface 601 will tighten the convex spherical arc surface 401 to restrict the rotation of the metal ball 4, so that the metal universal duct 2 can withstand high pressure, and can be increased or decreased according to actual needs. The number of groups of the limit adjustment components 3 is to extend or shorten the length of the metal universal guide tube 2. However, in actual use, if the user wants to adjust the direction of the metal universal guide tube 2, First, the user must first use a hand tool to loosen the metal front limit pieces 5 of the limit adjustment components 3 one by one, and then adjust the rotation of the metal balls 4 of the limit adjustment components 3 one by one. Then, it is necessary to use a hand tool to lock the metal front limit members 5 of the limit adjustment assembly 3 one by one, so that the metal ball 4 of the limit adjustment assembly 3 is tightly positioned. The guide tube 2 is quite troublesome and time-consuming in the operation of adjusting the steering.

Therefore, the object of the present invention is to provide an easy-to-rotate metal flexible pipe that can overcome at least one of the disadvantages of the prior art.

Therefore, the novel easy-rotating metal flexible pipe includes a nozzle unit and at least one extension unit.

The extension unit includes a first pipe member, a first nut member screwed to the first pipe member, a first ball liner, a second ball liner, and a first ball head. The first pipe member is formed with a first ball head. A tube inner hole, the first nut member is formed with a first inner cavity, the first ball liner is disposed in the first tube inner hole, and has a first inner liner surrounding and defining a first liner hole Surface, the first lining hole communicates with the inner hole of the first tube, and has a first spherical groove portion, the first lining surface has a first concave arc surface defining the first spherical groove portion, The material of the first ball liner is a liquid-tight and compressible material, the second ball liner is disposed in the first inner cavity and has a second inner liner surface that surrounds and defines a second liner hole. The second liner hole communicates with the first inner cavity and has a second ball groove portion. The second liner surface has a second concave arc portion defining the second ball groove portion. The second ball The material of the lining is a liquid-tight and compressible material, the first ball head has a first head that is adjustably disposed on the first ball groove portion and the second ball groove portion, and the first head has a The first outer convex arc surface in frictional contact with the first inner concave arc surface portion and the second inner concave arc surface portion, the first ball head can be operated to rotate relative to the first ball liner and the second ball liner, The first ball head is connected with the nozzle unit, and the first ball head is formed with a first ball inner hole connecting the nozzle unit and the first liner hole.

The effect of the present invention is that when the first pipe member and the first nut member of the extension unit of the present invention are locked to each other, the first pipe member and the first nut member do not directly contact the first ball head. Instead, the first ball head is tightened through the first ball liner and the second ball liner. Therefore, since the materials of the first ball liner and the second ball liner are both liquid-tight and compressible materials, they themselves It has the function of pressure resistance and lubricity. Therefore, when the new model is not subjected to external force, the new model can be maintained at a specific steering, but when the user needs to adjust the steering of the new model, the user does not need to Unscrew the first nut member of the extension unit, the user only needs to pull the first ball head of the extension unit through the connected parts, and the first ball head can overcome the first ball bush and the second ball head. The anti-slip resistance of the ball lining is pulled to a specific direction. In this way, the steering adjustment operation can be completed conveniently and quickly by the present invention.

Refer to FIGS. 3, 4 and 5, which are an embodiment of the new type of easy-to-rotate metal flexible tube 100. The metal flexible tube 100 includes a nozzle unit 10, two extension units 20, and a tailstock unit 30. It can be understood that in other variations of this embodiment, the number of the extension units 20 may also be one or more than two.

The nozzle unit 10 includes a nozzle joint 11 and a nozzle 12 disposed on the nozzle joint 11. The nozzle joint 11 is formed with a liquid outlet hole 13, and the nozzle 12 is formed with a spray hole 14 communicating with the liquid outlet hole 13. In this embodiment, the material of the nozzle joint 11 and the nozzle 12 is metal.

Each extension unit 20 includes a first pipe 40, a first nut 50 screwed to the first pipe 40, a first ball liner 60, a second ball liner 70, and a first ball head 80 . In this embodiment, the material of the first pipe member 40, the first nut member 50 and the first ball head 80 is metal.

The first pipe member 40 is formed with a first pipe inner hole 41. In this embodiment, the first pipe inner hole 41 has a first large-aperture section 411 facing the first nut member 50, and a first small-aperture section 411. Section 412, a first frusto-conical section 413 between the first large-aperture section 411 and the first small-aperture section 412, and a first frusto-conical section defined between the first large-aperture section 411 and the first frusto-conical section 413 between the first inner shoulder 414.

The first nut 50 is formed with a first inner cavity 51. In this embodiment, the first inner cavity 51 has a first large-diameter portion 511 facing the first tube 40, and a first large-diameter portion 511 facing the nozzle unit 10 The first small diameter portion 512 and a first outer shoulder 513 defined between the first large diameter portion 511 and the first small diameter portion 512.

The first ball liner 60 is disposed in the first tube inner hole 41. In this embodiment, the first ball liner 60 is disposed in the first large-aperture section 411 and abuts against the first inner shoulder 414. catch.

The first ball liner 60 has a first liner surface 61 that surrounds and defines a first liner hole 62, the first liner hole 62 communicates with the first tube inner hole 41, and has a first ball groove Portion 621, and a first communication hole portion 622 connected to the first ball groove portion 621 and communicated with the first frusto-conical section 413, the first lining surface 61 has a first ball groove The first inner concave arc portion 611 of the portion 621 is made of a liquid-tight and compressible material, such as Teflon.

The second ball liner 70 is disposed in the first inner cavity 51. In this embodiment, the second ball liner 70 is disposed in the first large-diameter portion 511 and abuts against the first outer shoulder portion 513 .

The second ball liner 70 has a second liner surface 71 that surrounds and defines a second liner hole 72, the second liner hole 72 communicates with the first inner cavity 51, and has a second ball groove portion 721, and a second push hole portion 722 connected to the second ball groove portion 721 and communicated with the first small diameter portion 512, the second lining surface 71 has a second ball groove portion 721 The second inner concave arc portion 711 of the second ball liner 70 is made of a liquid-tight and compressible material, such as Teflon.

The first ball head 80 has a first head 81 adjustably disposed on the first ball groove portion 621 and the second ball groove portion 721, and a first neck portion connected with the first head 81 82. The first ball head 80 is formed with a first ball inner hole 83.

The first head 81 has a first convex curved surface 811 frictionally contacting the first concave curved surface 611 and the second concave curved surface 711, and the first neck portion 82 passes through the second push hole The portion 722 extends into the first small diameter portion 512.

The first ball head 80 is connected to the nozzle unit 10. In this embodiment, the nozzle joint 11 is screwed to the first ball inner hole 83 of the first ball head 80.

The first ball inner hole 83 of the first ball head 80 communicates with the nozzle unit 10 and the first communicating hole portion 622 of the first liner hole 62. In this embodiment, the first ball inner hole 83 communicates with the liquid outlet hole 13 of the nozzle joint 11.

The first ball head 80 can be operated to rotate relative to the first ball liner 60 and the second ball liner 70.

The extension units 20 are connected between the nozzle unit 10 and the tailstock unit 30. In this embodiment, the first ball head 80 and the nozzle unit 10 of one of the extension units 20 adjacent to the nozzle unit 10 Connected, the first pipe 40 of one of any two adjacent extension units 20 is screwed to the first ball inner hole 83 of the first ball head 80 of the other, and the one of any two adjacent extension units 20 The first tube inner hole 41 of the first tube 40 of one is in communication with the first ball inner hole 83 of the first ball head 80 of the other, and is adjacent to the second extension unit 20 of the tailstock unit 30 A pipe 40 is connected to the tailstock unit 30.

The tailstock unit 30 includes a second tube 90, a second nut 110 screwed to the second tube 90, a third ball liner 120, a fourth ball liner 130, and a second ball head 140 . In this embodiment, the material of the second tube 90, the second nut 110 and the second ball head 140 is metal. In this embodiment, the tailstock unit 30 is suitable for connection with a hydraulic source (not shown) that supplies liquid.

The second pipe 90 is formed with a second pipe inner hole 91. In this embodiment, the second pipe inner hole 91 has a second large-aperture section 911 facing the second nut 110, and a second small-aperture Section 912, a second frusto-conical section 913 between the second large-aperture section 911 and the second small-aperture section 912, and a second frusto-conical section defined between the second large-aperture section 911 and the second frusto-conical section 913 between the second inner shoulder 914.

The second nut 110 is formed with a second inner cavity 111. In this embodiment, the second inner cavity 111 has a second large-diameter portion 112 facing the second tube 90, and a direction adjacent to the tailstock. The second small-diameter portion 113 of the other extension unit 20 of the unit 30 and a second outer shoulder 114 defined between the second large-diameter portion 112 and the second small-diameter portion 113.

The third ball liner 120 is disposed in the second tube inner hole 91. In this embodiment, the third ball liner 120 is disposed in the second large-aperture section 911 and abuts against the second inner shoulder 914 catch.

The third ball liner 120 has a third liner surface 121 that surrounds and defines a third liner hole 122, the third liner hole 122 communicates with the second tube inner hole 91, and has a third ball groove Portion 123, and a third communicating hole portion 124 connected to the third ball groove portion 123 and communicated with the second frusto-conical section 913, the third lining surface 121 has a third ball groove portion The third inner concave arc portion 125 of 123 is made of a liquid-tight and compressible material, such as Teflon.

The fourth ball liner 130 is disposed in the second inner cavity 111. In this embodiment, the fourth ball liner 130 is disposed in the second large diameter portion 112 and abuts against the second outer shoulder 114 .

The fourth ball liner 130 has a fourth liner surface 131 surrounding and defining a fourth liner hole 132, the fourth liner hole 132 communicates with the second inner cavity 111, and has a fourth ball groove portion 133, and a fourth push hole portion 134 connected to the fourth ball groove portion 133 and communicated with the second small diameter portion 113, the fourth lining surface 131 has a fourth ball groove portion 133 The fourth inner concave arc portion 135 is made of a liquid-tight and compressible material, such as Teflon.

The second ball head 140 has a second head portion 141 adjustably disposed on the third ball groove portion 123 and the fourth ball groove portion 133, and a second neck portion connected to the second head portion 141 142. The second ball head 140 is formed with a second ball inner hole 143.

The second head 141 has a second outer convex arc surface 144 frictionally contacting the third inner concave arc surface 125 and the fourth inner concave arc surface 135, and the second neck portion 142 passes through the fourth push hole The portion 134 extends into the second small diameter portion 113.

The first tube 40 of the other extension unit 20 adjacent to the tailstock unit 30 is screwed to the second ball inner hole 143 of the second ball head 140, and the second ball inner hole 143 is connected to and adjacent to the tailstock The first tube inner hole 41 of the first tube 40 of the other extension unit 20 of the unit 30 and the third communicating hole portion 124 of the third lining hole 122.

The second ball head 140 can be operated to rotate relative to the third ball liner 120 and the fourth ball liner 130.

Thereby, as shown in FIGS. 5 and 6, when the user wants to adjust the steering of the metal flexible tube 100, the nozzle unit 10 can be used to pull the nozzle unit 10 adjacent to one of the extension units 20 of the nozzle unit 10. First ball head 80, and use the first pipe 40 adjacent to one of the extension units 20 of the nozzle unit 10 to pull the first ball head 80 of the other extension unit 20 adjacent to the tailstock unit 30 , And then use the second tube 90 of the other extension unit 20 adjacent to the tailstock unit 30 to pull the second ball head 140 of the tailstock unit 30, so as to adjust the turning of the metal flexible tube 100, The nozzle unit 10 is directed to the position where the liquid is to be sprayed.

Based on the above description, the advantages of the present invention can be summarized as follows:

Compared with the prior art, when the first pipe member 40 and the first nut member 50 of the extension unit 20 of the metal flexible tube 100 of the present invention are locked to each other, the first pipe member 40 and the first nut member 50 are parallel to each other. The first ball head 80 is not directly contacted, but the first ball head 80 is pressed tightly through the first ball liner 60 and the second ball liner 70. Similarly, the tailstock unit 30 is in the second ball head 80. When the pipe 90 and the second nut 110 are locked to each other, the third ball liner 120 and the fourth ball liner 130 are also used to tighten the second ball head 140. In this way, because the first ball liner 60, The materials of the second ball liner 70, the third ball liner 120 and the fourth ball liner 130 are all liquid-tight and compressible materials (such as Teflon), which have the function of pressure resistance and lubricity. Therefore, When the metal flexible tube 100 is not subjected to external force, the metal flexible tube 100 can be maintained at a specific turning direction, but when the user needs to adjust the turning direction of the metal flexible tube 100, the user does not To loosen the first nut 50 of the extension units 20 and the second nut 110 of the tailstock unit 30, the user only needs to pull the first balls of the extension units 20 through the connected parts. The head 80 and the second ball head 140 of the tailstock unit 30, the first ball head 80 of each extension unit 20 can overcome the anti-slip resistance of the first ball liner 60 and the second ball liner 70, and be pulled When moving to a specific direction, the second ball head 140 of the tailstock unit 30 can overcome the anti-slip resistance of the third ball liner 120 and the fourth ball liner 130, and is pulled in a specific direction. , The steering adjustment operation of the metal flexible tube 100 can be completed conveniently and quickly.

In summary, the easy-rotating metal flexible pipe of the present invention can not only endure high-pressure use, but also can facilitate the adjustment of the steering direction, so it can indeed achieve the purpose of new cost.

However, the above are only examples of the present model, and should not be used to limit the scope of implementation of the present model, all simple equivalent changes and modifications made in accordance with the patent scope of the present model application and the contents of the patent specification still belong to This new patent covers the scope.

100: Metal flexible pipe 10: Nozzle unit 11: Nozzle connector 12: Nozzle 13: Outlet hole 14: Ejection hole 20: Extension unit 30: Tailstock unit 40: The first pipe 41: The inner hole of the first tube 411: The first large aperture section 412: The first small aperture section 413: The first truncated cone section 414: first inner shoulder 50: The first nut piece 51: first cavity 511: The first major diameter part 512: The first small diameter part 513: first outer shoulder 60: The first ball liner 61: The first lining surface 611: The first concave arc face 62: The first lining hole 621: first ball groove part 622: First communicating hole 70: second ball liner 71: The second lining surface 711: The second concave arc face 72: second lining hole 721: second ball groove part 722: Second Push Hole 80: first ball head 81: first head 811: The first convex arc 82: The first neck 83: Inner hole of the first ball 90: second pipe fitting 91: second tube inner hole 911: the second largest aperture segment 912: second small aperture section 913: The second truncated cone section 914: second inner shoulder 110: The second nut piece 111: second cavity 112: Second largest diameter part 113: The second small diameter part 114: second outer shoulder 120: third ball liner 121: The third lining surface 122: third lining hole 123: The third ball groove part 124: Third communicating hole 125: The third concave arc face 130: The fourth ball liner 131: The fourth lining surface 132: The fourth lining hole 133: The fourth ball groove part 134: Fourth Push Hole 135: The fourth concave arc face 140: second ball head 141: The second head 142: The second neck 143: second ball inner hole 144: The second convex arc 1: Plastic universal guide tube 101: pipe fittings 102: print head 103: head 104: Socket 2: Metal universal guide tube 3: Limit switch component 4: Metal ball 401: Convex spherical arc 5: Metal front stopper 501: forward concave ball arc 6: Metal rear limiter 601: Back concave ball arc

The other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, among which: FIG. 1 is a schematic diagram of a use state of a conventional plastic universal guide tube; Figure 2 is a combined cross-sectional view of a conventional metal universal guide tube; Figure 3 is a combined perspective view of an embodiment of the novel easy-to-rotate metal flexible pipe; Figure 4 is a partial exploded perspective view of the embodiment; Figure 5 is a combined cross-sectional view of the embodiment; and Fig. 6 is a view similar to Fig. 5, illustrating that the embodiment is adjusted for steering.

100: Metal flexible pipe

10: Nozzle unit

11: Nozzle connector

12: Nozzle

13: Outlet hole

14: Ejection hole

20: Extension unit

30: Tailstock unit

40: The first pipe

41: The inner hole of the first tube

411: The first large aperture section

412: The first small aperture section

413: The first truncated cone section

414: first inner shoulder

50: The first nut piece

51: first cavity

511: The first major diameter part

512: The first small diameter part

513: first outer shoulder

60: The first ball liner

61: The first lining surface

611: The first concave arc face

62: The first lining hole

621: first ball groove part

622: First communicating hole

70: second ball liner

71: The second lining surface

711: The second concave arc face

72: second lining hole

721: second ball groove part

722: Second Push Hole

80: first ball head

81: first head

811: The first convex arc

82: The first neck

83: Inner hole of the first ball

90: second pipe fitting

91: second tube inner hole

911: the second largest aperture segment

912: second small aperture section

913: The second truncated cone section

914: second inner shoulder

110: The second nut piece

111: second cavity

112: Second largest diameter part

113: The second small diameter part

114: second outer shoulder

120: third ball liner

121: The third lining surface

122: third lining hole

123: The third ball groove part

124: Third communicating hole

125: The third concave arc face

130: The fourth ball liner

131: The fourth lining surface

132: The fourth lining hole

133: The fourth ball groove part

134: Fourth Push Hole

135: The fourth concave arc face

140: second ball head

141: The second head

142: The second neck

143: second ball inner hole

144: The second convex arc

Claims (8)

An easy-to-rotate metal flexible pipe, including: A nozzle unit; and At least one extension unit includes a first pipe, a first nut screwed with the first pipe, a first ball liner, a second ball liner, and a first ball head. The first pipe is formed There is a first tube inner hole, the first nut member forms a first inner cavity, the first ball liner is disposed in the first tube inner hole, and has a first liner hole surrounding and defining a first liner hole. The lining surface, the first lining hole communicates with the inner hole of the first pipe, and has a first ball groove portion, and the first lining surface has a first concave arc defining the first ball groove portion On the face, the material of the first ball liner is a liquid-tight and compressible material, and the second ball liner is arranged in the first inner cavity and has a second inner liner surface surrounding and defining a second liner hole , The second lining hole communicates with the first inner cavity, and has a second ball groove portion, the second lining surface has a second concave arc portion defining the second ball groove portion, the first The material of the second ball liner is a liquid-tight and compressible material, the first ball head has a first head that is adjustably disposed on the first ball groove portion and the second ball groove portion, and the first head It has a first convex arc surface in frictional contact with the first concave arc surface and the second concave arc surface. The first ball head can be operated relative to the first ball liner and the second ball liner. When rotating, the first ball head is connected with the nozzle unit, and the first ball head is formed with a first ball inner hole connecting the nozzle unit and the first liner hole. The easily rotatable metal flexible pipe according to claim 1, wherein the first pipe inner hole of the first pipe has a first large-aperture section facing the first nut, a first small-aperture section, A first frusto-conical section between the first large-aperture section and the first small-aperture section, and a first inner shoulder defined between the first large-aperture section and the first frusto-conical section Part, the first inner cavity of the first nut has a first large-diameter part facing the first tube, a first small-diameter part facing the nozzle unit, and a first large-diameter part and The first outer shoulder portion between the first small-diameter portions, the first ball liner is disposed in the first large-aperture section and abuts against the first inner shoulder, and the first liner hole further has a A first communicating hole portion connected to the first ball groove portion and communicating with the first frusto-conical section, and the second ball bushing is disposed in the first large diameter portion and abuts against the first outer shoulder portion , The second lining hole further has a second pushing hole connected to the second ball groove portion and communicating with the first small diameter portion, and the first ball head also has a second head It is connected to and extends to the first neck portion in the first small diameter portion through the second push-pull hole portion. The easily rotatable metal flexible pipe according to claim 2, wherein the nozzle unit includes a nozzle joint and a nozzle arranged on the nozzle joint, the nozzle joint is formed with a liquid outlet, and the nozzle is formed with a nozzle A spray hole communicating with a liquid outlet, the nozzle joint is screwed with the first ball inner hole of the first ball head, and the liquid outlet is communicated with the first ball inner hole. The easily rotatable metal flexible pipe according to claim 1, comprising a number of extension units, the first ball head of one of the extension units adjacent to the nozzle unit is connected to the nozzle unit, and any two adjacent extension units are connected to the nozzle unit. The first tube of one is screwed to the first ball inner hole of the first ball head of the other, and the first tube inner hole of the first tube of any two adjacent extension units is connected to the other The first ball inner hole of the first ball head of one is connected. The easy-rotating metal flexible pipe according to claim 4, further comprising a tailstock unit, and the extension units are connected between the nozzle unit and the tailstock unit and are adjacent to another extension unit of the tailstock unit The first pipe is connected to the tailstock unit. The easy-to-rotate metal flexible pipe according to claim 5, wherein the tailstock unit includes a second pipe member, a second nut member screwed to the second pipe member, a third ball liner, and a first Four-ball liner, and a second ball head, the second tube member is formed with a second tube inner hole, the second nut member is formed with a second inner cavity, and the third ball liner is disposed in the second tube inner hole , And has a third lining surface surrounding and defining a third lining hole, the third lining hole communicates with the second tube inner hole, and has a third ball groove portion, the third lining surface There is a third concave arc surface defining the third ball groove, the material of the third ball liner is a liquid-tight and compressible material, and the fourth ball liner is disposed in the second inner cavity and has A fourth lining surface surrounding and defining a fourth lining hole, the fourth lining hole communicating with the second inner cavity, and having a fourth ball groove portion, the fourth lining surface defining a The fourth inner concave arc portion of the fourth ball groove portion, the material of the fourth ball liner is a liquid-tight and compressible material, and the second ball head has an adjustably disposed on the third ball groove portion and the The second head of the fourth ball groove portion, the second head has a second convex arc surface frictionally contacting the third concave arc surface and the fourth concave arc surface, the second ball head can Operated to rotate relative to the third ball liner and the fourth ball liner, the second ball head is formed with a second ball inner hole adjacent to the first tube of the other extension unit of the tailstock unit and the The second ball inner hole of the second ball head is screwed together, and the second ball inner hole communicates with the first tube inner hole of the first tube adjacent to the other extension unit of the tailstock unit and the third liner hole . The easily rotatable metal flexible pipe according to claim 6, wherein the second pipe inner hole of the second pipe has a second large-aperture section facing the second nut member, a second small-aperture section, A second frusto-conical section between the second large-aperture section and the second small-aperture section, and a second inner shoulder defined between the second large-aperture section and the second frusto-conical section Part, the second inner cavity of the second nut member has a second large-diameter part facing the second tube, a second small-diameter part facing the other extension unit adjacent to the tailstock unit, and a A second outer shoulder portion defined between the second large diameter portion and the second small diameter portion, the third ball liner is disposed in the second large aperture section and abuts against the second inner shoulder portion, The third liner hole also has a third communication hole portion connected with the third ball groove portion and communicated with the second frusto-conical section, and the fourth ball liner is disposed in the second large diameter portion and is connected with The second outer shoulder abuts, the fourth liner hole further has a fourth push hole connected to the fourth ball groove portion and communicated with the second small diameter portion, the second ball head is also There is a second neck portion connected to the second head portion and extending into the second small diameter portion through the fourth pushing hole portion. The easily rotatable metal flexible tube according to claim 7, wherein the material of the first ball liner, the second ball liner, the third ball liner and the fourth ball liner is Teflon.

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