Unpowered follow-up cable take-up and pay-off device for L-shaped drill floor robot in three-dimensional space

Abstract

The invention discloses an L-shaped drill floor robot three-dimensional space cable unpowered follow-up take-up and pay-off device which comprises a cable take-up and pay-off mechanism and an armored cable, one end of the armored cable is connected with the cable take-up and pay-off mechanism, and the end, away from the cable take-up and pay-off mechanism, of the armored cable is connected with a cable connection steering mechanism. A cable guide mechanism is arranged between the cable connection steering mechanism and the cable winding and unwinding mechanism, and the cable guide mechanism is arranged below the armored cable. The cable take-up and pay-off mechanism is installed at the end of an L-shaped drill floor robot storage rail, namely, the cable take-up and pay-off mechanism is located at the position of a front laying table on the right side of a drill floor face, the operation space of the drill floor face is not additionally occupied, the installation and work space of the cable take-up and pay-off mechanism is converted into the height from the plane, and the collision risk caused by drill floor combined operation is eliminated on the contact of saving the space.

Description

Technical Field

[0001] This invention belongs to the field of oil drilling equipment technology, specifically relating to a three-dimensional space cable retraction and deployment device for an L-shaped drilling rig robot. Background Technology

[0002] During the movement of the L-shaped drilling robot, the traveling trolley has three spatial motion postures relative to the track: lateral movement, longitudinal movement, and turning movement. The robot's actuator is located above the traveling trolley, while the control system and external cables are located on one side of the track. Therefore, how the multiple power, communication, and video cables between the traveling trolley and the track can reliably complete the lateral, longitudinal, and turning movements during the operation of the drilling robot becomes an important indicator of whether the equipment can work normally. These multiple cables are more than 4 meters long.

[0003] Currently, three common practices are adopted, but all have certain problems after field verification: 1. Drilling holes at the turns of the L-shaped track on the drilling platform, with multiple cables passing through these holes to reach the traveling trolley. The traveling trolley drags multiple cables during lateral, longitudinal, and turning movements, and pulls them back and forth at the drill platform opening. Field use revealed that this method results in rapid cable wear, easy cable breakage during dragging on the drilling platform, and easy damage to the cables from tools or pipes on the drilling platform; 2. Vertically installing a cable chain along the outside of the L-shaped track, used to move the cables within the chain when the traveling trolley moves. Field testing showed that... The discovery that the drag chain is compressed at the L-shaped track bend during the movement of the trolley achieves the turning effect, this compression force generates a large external load on the drag chain, causing damage and breakage of the drag chain structure in a short period of time; 3. Install a vertical pole about 3 meters high at the front of the drilling platform, and connect multiple cables to the traveling trolley through this pole. In this way, the traveling trolley transmits power and signals through the pulling and retracting of multiple cables during lateral, longitudinal, and turning processes. This method is simple, but multiple cables are always in the air, which poses a risk of being hit by the pipe column. At the same time, the suspended cables occupy the safety passage for laying the platform in front of the drilling platform, which poses a safety hazard. Summary of the Invention

[0004] The purpose of this invention is to provide a three-dimensional spatial cable retraction and deployment device for an L-shaped drilling robot, which enables multiple cables between the walking trolley and the track of the L-shaped track-type drilling robot to reliably complete lateral, longitudinal, and turning movements during the operation.

[0005] The technical solution adopted in this invention is a three-dimensional space cable unpowered follow-up retraction and deployment device for an L-shaped drilling platform robot, including a cable retraction and deployment mechanism and an armored cable. One end of the armored cable is connected to the cable retraction and deployment mechanism, and the end of the armored cable away from the cable retraction and deployment mechanism is connected to a cable connection turning mechanism. A cable guide mechanism is provided between the cable connection turning mechanism and the cable retraction and deployment mechanism, and the cable guide mechanism is located below the armored cable.

[0006] The invention is further characterized by:

[0007] The cable winding and unwinding mechanism includes a mounting bracket, a fixed pulley assembly connected to the bottom of the mounting bracket, a movable pulley assembly connected to the mounting bracket via a lifting and unwinding connecting frame, a lifting and unwinding wire rope connected to the top of the lifting and unwinding connecting frame, a guide assembly connected to the top of the mounting bracket, and a powered counterweight connected to the end of the lifting and unwinding wire rope away from the lifting and unwinding connecting frame, which passes around the guide assembly. One end of the armored cable passes through the fixed pulley assembly and the movable pulley assembly in sequence and is connected to the mounting bracket.

[0008] The middle part of the fixed pulley assembly is connected between the two opposite side walls of the mounting bracket via a first rotating shaft. A second rotating shaft is connected between the two ear plates of the lifting and lowering connecting frame. The second rotating shaft passes through the middle part of the movable pulley assembly. Guide grooves are provided on the opposite side walls of the mounting bracket along their length direction. The two ends of the second rotating shaft are respectively set in the two guide grooves.

[0009] The guide assembly includes two third rotating shafts arranged side by side. Both third rotating shafts are connected between opposite side walls of the mounting bracket. The two third rotating shafts are located near the top of the mounting bracket. The shafts of the two third rotating shafts are respectively connected to a first guide pulley and a second guide pulley. The lifting wire rope passes through the rope grooves of the first guide pulley and the second guide pulley in sequence. The first guide pulley is located directly above the connection point between the lifting wire rope and the lifting connecting frame.

[0010] The mounting bracket has counterweight guide columns connected to its two opposite inner walls along its length. The power counterweight block has guide grooves on its opposite sides, and the guide grooves match the counterweight guide columns.

[0011] The armored cable includes a first cable assembly and a second cable assembly arranged side by side. Both the first and second cable assemblies are external to cable tubing. One end of each cable tubing passes through a fixed pulley assembly and a movable pulley assembly in sequence and is connected to a mounting bracket. The other end of the cable tubing is connected to a cable connection and steering mechanism. The cable tubing of the first cable assembly is filled with a power cable, and the cable tubing of the second cable assembly is filled with a communication cable. The cable tubing is positioned above the cable guiding mechanism.

[0012] The cable guiding mechanism includes several parallel roller brackets, each with a roller connected to it. The roller brackets are located between the mounting bracket and the cable connection and turning mechanism.

[0013] It also includes an inner turning guide bracket and an outer turning guide bracket arranged in parallel with each other. The inner turning guide bracket and the outer turning guide bracket are arranged between two of the roller brackets. The inner turning guide bracket is evenly connected with a number of inner turning guide rollers along its length, and the outer turning guide bracket is evenly connected with a number of outer turning guide rollers along its length. The cable hose is arranged above the roller.

[0014] The beneficial effects of this invention are:

[0015] 1) The L-shaped drilling robot three-dimensional space cable non-powered follow-up winding and unwinding mechanism of the present invention is installed at the end of the storage track of the L-shaped drilling robot, that is, at the front platform on the right side of the drilling platform. It does not occupy the working space of the drilling platform, and transforms the installation and working space of the cable winding and unwinding mechanism from a plane to a height. It eliminates the collision risk caused by joint drilling operations in a space-saving manner.

[0016] 2) This invention armors all power cables, communication cables, and other cables, which, compared with existing technologies, improves the protection capability of the cables, ensures their flexibility, eliminates the risk of cable wear, and reduces the number of cables during operation.

[0017] 3) The L-shaped drilling robot equipped with the three-dimensional space cable non-powered follow-up winding and retraction mechanism of this invention ensures that the armored cable is always inside the L-shaped track during the movement of the equipment, and the cable will not be higher than the drilling platform surface. This fundamentally improves the working reliability of the cable and reduces the risk of the cable being bumped or knocked.

[0018] 4) The cable guiding mechanism used in this invention realizes the lifting and rolling of the armored cable when it moves on the straight section of the track. The relative movement between the cable and the support roller is rolling friction, which has the characteristics of low resistance and strong wear resistance. When the armored cable moves on the curved track, the L-shaped guidance of the cable is realized through the turning guide mechanism, and the conductor roller effectively protects the cable from wear.

[0019] 5) The cable winding and unwinding mechanism of the present invention adopts the form of a movable pulley group to realize the extension of the cable winding and unwinding range. That is, the stroke of the movable pulley assembly in lifting and lowering the cable is half the length of the cable winding and unwinding, which effectively reduces the stroke of the movable pulley and lowers the height of the cable winding and unwinding mechanism.

[0020] 6) This invention achieves cable retraction and deployment in a non-powered manner, without the need for an actuator. When the drilling robot goes to the wellhead for operation, the armored cable is pulled out by the power of the traveling trolley, the movable pulley is lowered, and the power counterweight is raised. When the drilling robot is waiting to avoid a collision, the movable pulley is pulled up automatically by the power counterweight. At this time, the armored cable is retracted with the movement of the traveling trolley.

[0021] 7) The L-shaped drilling robot's three-dimensional space cable retraction and extension mechanism of this invention is integrated with the L-shaped drilling robot, eliminating the need for separate disassembly and transportation during the disassembly and installation process;

[0022] 8) The L-shaped drilling robot's three-dimensional space cable unpowered follow-up winding and rewinding mechanism of the present invention realizes the horizontal and vertical movement of the cable in the horizontal plane, and at the same time realizes the vertical movement in the height direction, achieving the effect of unpowered follow-up winding and rewinding in three-dimensional space. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the working state of the L-shaped drilling robot's three-dimensional space cable unpowered follow-up retraction device of the present invention;

[0024] Figure 2 This is a schematic diagram of the L-shaped drilling robot's three-dimensional space cable unpowered follow-up retraction device in the avoidance standby state.

[0025] Figure 3 This is a schematic diagram of the structure of the L-shaped drilling robot's three-dimensional space cable unpowered follow-up retraction device of the present invention;

[0026] Figure 4 This is a schematic diagram of the cable winding mechanism during operation of the L-shaped drilling robot three-dimensional space cable unpowered follow-up winding and winding device of the present invention;

[0027] Figure 5 This is a schematic diagram of the armored cable structure during operation of the L-shaped drilling robot three-dimensional space cable unpowered follow-up retraction device of the present invention.

[0028] Figure 6 This is a schematic diagram of the connection structure of the cable winding mechanism and armored cable of the L-shaped drilling robot three-dimensional space cable unpowered follow-up winding and winding device in the present invention when it is in a waiting position for obstacle avoidance.

[0029] Figure 7 This is a schematic diagram of the cable guiding mechanism of the L-shaped drilling robot's three-dimensional space cable unpowered follow-up cable retraction device of the present invention.

[0030] In the diagram: 1. Cable winding and unwinding mechanism; 101. Mounting bracket; 102. Fixed pulley assembly; 103. Movable pulley assembly; 104. Lifting and unwinding connecting frame; 105. Lifting and unwinding wire rope; 106. First guide pulley; 107. Second guide pulley I; 108. Power counterweight block; 109. Counterweight guide column; 110. First rotating shaft; 111. Second rotating shaft; 112. Guide groove; 113. Third rotating shaft; 114. Guide slide groove; 2. Armored cable, 201. First cable assembly, 202. Second cable assembly, 203. Cable hose, 204. Power cable, 205. Communication cable, 206. Other pipelines, 3. Cable guiding mechanism, 301. Roller bracket, 302. Roller, 303. Inner turning guide bracket, 304. Inner turning guide roller, 305. Outer turning guide bracket, 306. Outer turning guide roller, 4. Cable connection and turning mechanism. Detailed Implementation

[0031] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0032] This invention relates to a three-dimensional space cable retraction and deployment device for an L-shaped drilling platform robot, such as... Figure 1 As shown, the system includes a cable winding mechanism 1 and an armored cable 2. One end of the armored cable 2 is connected to the cable winding mechanism 1, and the end of the armored cable 2 away from the cable winding mechanism 1 is connected to a cable connection steering mechanism 4. A cable guide mechanism 3 is provided between the cable connection steering mechanism 4 and the cable winding mechanism 1, and the cable guide mechanism 3 is located below the armored cable 2. The cable winding mechanism 1 is installed at one end of the L-shaped drilling platform robot storage track, that is, at the front platform on the right side of the drilling platform. The fixed end of the armored cable 2 is connected to the cable winding mechanism 1, and its moving end is connected to the cable connection steering mechanism 4. The cable connection steering mechanism 4 is connected to the traveling trolley. Figure 2-3 As shown, during the movement of the traveling trolley, the armored cable 2 is pulled to move. During the movement, the armored cable 2 comes into contact with the cable guide mechanism 3, and the cable guide mechanism 3 reduces the friction of the armored cable 2 during the movement.

[0033] Example 1

[0034] like Figure 4As shown, the cable winding and unwinding mechanism 1 includes a mounting bracket 101. A fixed pulley assembly 102 is connected to the bottom of the mounting bracket 101. A movable pulley assembly 103 is connected to the mounting bracket 101 via a lifting and unwinding connecting frame 104. A lifting and unwinding wire rope 105 is connected to the top of the lifting and unwinding connecting frame 104. A guide assembly is connected to the top of the mounting bracket 101. One end of the lifting and unwinding wire rope 105 away from the lifting and unwinding connecting frame 104 passes around the guide assembly and is connected to a dynamic counterweight 108. One end of the armored cable 2 passes through the fixed pulley assembly 102 and the movable pulley assembly 103 in sequence and is connected to the mounting bracket 101. Multiple sets of pulleys are installed side by side in the fixed pulley assembly 102 and the movable pulley assembly 103. The pulleys in the movable pulley assembly 103 are the same in number and direction as the pulleys in the fixed pulley assembly 102. The power counterweight 108 pulls the movable pulley assembly 103 up and down along the side wall of the mounting bracket 101 by lifting and releasing the wire rope 105. During the movement, the movable pulley assembly 103 can rotate according to the actual situation to meet the needs of cable winding movement.

[0035] The fixed pulley assembly 102 is connected at its center to the opposite side walls of the mounting bracket 101 via a first rotating shaft 110. A second rotating shaft 111 is connected between the two lugs of the lifting and lowering connecting frame 104. The second rotating shaft 111 passes through the center of the movable pulley assembly 103. Each of the opposite side walls of the mounting bracket 101 has a guide groove 112 along its length, and the two ends of the second rotating shaft 111 are respectively located in the two guide grooves 112. The movable pulley assembly 103 moves along the guide grooves 112 during its up-and-down sliding motion, and the guide grooves 112 guide the movable pulley assembly 103.

[0036] The guiding assembly includes two third rotating shafts 113 arranged side by side. Both third rotating shafts 113 are connected between opposite side walls of the mounting bracket 101. The two third rotating shafts 113 are positioned near the top of the mounting bracket 101. The shafts of the two third rotating shafts 113 are respectively connected to a first guide pulley 106 and a second guide pulley 107. The lifting wire rope 105 passes sequentially through the rope grooves of the first guide pulley 106 and the second guide pulley 107. The first guide pulley 106 is positioned directly above the connection point between the lifting wire rope 105 and the lifting connecting frame 104. The second guide pulley 107 is installed front-to-back with the first guide pulley 106, and aligned left-to-right.

[0037] The mounting bracket 101 has counterweight guide columns 109 connected to its two opposite inner walls along its length. The power counterweight block 108 has guide grooves 114 on its opposite sides, which match the counterweight guide columns 109. Several connecting cylinders are connected to the two opposite inner walls of the mounting bracket 101 along its length. The counterweight guide columns 109 pass through the connecting cylinders, and the outer diameter of the connecting cylinder is no larger than the size of the guide groove 114, ensuring that the power counterweight block 108 can move up and down. The guide groove 114 is guided and limited by the two counterweight guide columns 109 to prevent the power counterweight block 108 from shaking and colliding with other mechanisms during its up-and-down movement. When the traveling trolley approaches the mounting frame 101, the power counterweight 108 moves downward under its own weight. The power counterweight 108 pulls the movable pulley assembly 103 upward through the lifting and releasing steel wire rope 105. The movable pulley assembly can then pull the armored cable 2 to achieve cable retraction. When the traveling trolley moves, it pulls the armored cable 2, which in turn pulls the movable pulley assembly 103 downward. During the movement of the movable pulley assembly 103, the power counterweight 108 moves upward through the lifting and releasing steel wire rope 105.

[0038] Example 2

[0039] like Figure 5-6 As shown, the armored cable 2 includes a first cable assembly 201 and a second cable assembly 202 arranged side by side. Both the first cable assembly 201 and the second cable assembly 202 are externally fitted with cable tubing 203. One end of each cable tubing 203 passes sequentially through a fixed pulley assembly 102 and a movable pulley assembly 103 and connects to a mounting bracket 101. The other end of each cable tubing 203 connects to a cable connection and steering mechanism 4. The cable tubing 203 of the first cable assembly 201 is filled with a power cable 204, and the cable tubing 203 of the second cable assembly 202 is filled with a communication cable 205. The cable tubing 203 is positioned above the cable guiding mechanism 3. The armored cable 2 can increase or decrease the number of cable assemblies according to actual operating conditions. The cable tubing 203 possesses certain flexibility, connection strength, and wear resistance. The cable tubing 203 of the second cable assembly 202 is filled with a communication cable 205 and other conduits 206. The quantity and arrangement of cables within the cable tubing 203 are combined according to actual needs.

[0040] Example 3

[0041] like Figure 7As shown, the cable guiding mechanism 3 includes several parallel roller brackets 301, each roller bracket 301 is connected to a roller 302, and the roller bracket 301 is located between the mounting bracket 101 and the cable connection and turning mechanism 4. The roller bracket 301 consists of a base plate and ear plates connected to both sides of the base plate. The base plate is installed on the base plate of the track, and the roller 302 is connected between the two ear plates. The roller brackets 301 are installed in the working section and storage section of the L-shaped track according to the actual length of the track. The number of rollers is installed as needed. The roller 302 supports the cable hose 203 to reduce friction during its movement.

[0042] It also includes an inner turning guide bracket 303 and an outer turning guide bracket 305 arranged parallel to each other. The inner turning guide bracket 303 and the outer turning guide bracket 305 are positioned between two roller brackets 301. The inner turning guide bracket 303 has several inner turning guide rollers 304 evenly connected along its length, and the outer turning guide bracket 305 has several outer turning guide rollers 306 evenly connected along its length. The cable hose 203 is positioned above the roller 302. The inner turning guide bracket 303 is installed on the inner side of the L-shaped track turning section, and multiple inner turning guide rollers 304 are vertically hinged between the upper and lower panels of the inner turning guide bracket 303. The outer turning guide bracket 305 is installed on the outer side of the L-shaped track turning section, and multiple outer turning guide rollers 306 are vertically hinged between the upper and lower panels of the outer turning guide bracket 305. This provides guidance and anti-wear protection for the armored cable 2 during the turning process.

[0043] The working principle of the L-shaped drilling robot's three-dimensional space cable non-powered follow-up retraction and deployment device of the present invention is as follows:

[0044] The cable guiding mechanism 3 is used to lift and roll the armored cable 2 when it moves on the straight section of the track. When the armored cable 2 moves on the curved track, the turning guiding mechanism 3 is used to guide the cable in an L-shape. The invention uses a movable pulley system to extend the cable winding and unwinding range. That is, the stroke of the movable pulley assembly 103 in lifting and lowering the cable is half the length of the cable winding and unwinding, which effectively reduces the stroke of the movable pulley and lowers the height of the cable winding and unwinding mechanism 1. The invention uses a non-powered method to realize the winding and unwinding of the cable without the participation of an actuator. When the drilling robot goes to the wellhead for operation, the armored cable 2 is pulled out by the power of the traveling trolley, the movable pulley assembly 103 is lowered, and the power counterweight 108 is raised. When the drilling robot is waiting to avoid the movement, the movable pulley assembly 103 is pulled up under the automatic action of the power counterweight 108. At this time, the armored cable 2 is retracted with the movement of the traveling trolley.

[0045] This invention relates to a three-dimensional space cable retraction and deployment device for an L-shaped drilling robot. The cable retraction and deployment mechanism is installed at the end of the L-shaped drilling robot's storage track, specifically at the front platform on the right side of the drilling platform. It does not occupy additional working space on the drilling platform, transforming the installation and working space of the cable retraction and deployment mechanism from a plane to a height, thus eliminating the risk of collisions during joint drilling operations and saving space. All power cables, communication cables, and other cables are armored, which, compared to existing technologies, improves cable protection, ensures cable flexibility, eliminates the risk of cable wear, and reduces the number of cables during operation. During the drilling robot's movement, the armored cables remain within the L-shaped track, preventing them from protruding above the drilling platform surface. This fundamentally improves cable reliability and reduces the risk of cable impact. The three-dimensional space cable retraction and deployment mechanism is integrated with the L-shaped drilling robot, eliminating the need for separate disassembly and transportation during installation and removal. This mechanism enables lateral and longitudinal movement of the cable in the horizontal plane, as well as vertical movement in the height direction, achieving the effect of three-dimensional space cable retraction and deployment without power.

Claims

1. A three-dimensional space cable retraction and deployment device for an L-shaped drilling platform robot, characterized in that, It includes a cable winding mechanism (1) and an armored cable (2). One end of the armored cable (2) is connected to the cable winding mechanism (1). The end of the armored cable (2) away from the cable winding mechanism (1) is connected to a cable connection turning mechanism (4). A cable guide mechanism (3) is provided between the cable connection turning mechanism (4) and the cable winding mechanism (1). The cable guide mechanism (3) is located below the armored cable (2).

2. The L-shaped drilling platform robot three-dimensional space cable non-powered follow-up retraction device according to claim 1, characterized in that, The cable winding and unwinding mechanism (1) includes a mounting bracket (101), a fixed pulley assembly (102) connected to the bottom of the mounting bracket (101), a movable pulley assembly (103) connected to the mounting bracket (101) via a lifting and unwinding connecting frame (104), a lifting and unwinding wire rope (105) connected to the top of the lifting and unwinding connecting frame (104), a guide assembly connected to the top of the mounting bracket (101), and a power counterweight (108) connected to the end of the lifting and unwinding wire rope (105) away from the lifting and unwinding connecting frame (104) passing around the guide assembly. One end of the armored cable (2) passes through the fixed pulley assembly (102) and the movable pulley assembly (103) in sequence and is connected to the mounting bracket (101).

3. The L-shaped drilling platform robot three-dimensional space cable non-powered follow-up retraction device according to claim 2, characterized in that, The middle part of the fixed pulley assembly (102) is connected between the opposite side walls of the mounting bracket (101) via a first rotating shaft (110). A second rotating shaft (111) is connected between the two ear plates of the lifting and placing connecting frame (104). The second rotating shaft (111) passes through the middle part of the movable pulley assembly (103). The opposite side walls of the mounting bracket (101) are provided with guide grooves (112) along their length direction. The two ends of the second rotating shaft (111) are respectively set in the two guide grooves (112).

4. The L-shaped drilling platform robot three-dimensional space cable non-powered follow-up retraction device according to claim 2, characterized in that, The guide assembly includes two third rotating shafts (113) arranged side by side. The two third rotating shafts (113) are connected between the opposite side walls of the mounting bracket (101). The two third rotating shafts (113) are arranged near the top of the mounting bracket (101). The shafts of the two third rotating shafts (113) are respectively connected to a first guide pulley (106) and a second guide pulley (107). The lifting wire rope (105) passes through the rope grooves of the first guide pulley (106) and the second guide pulley (107) in sequence. The first guide pulley (106) is located directly above the connection point between the lifting wire rope (105) and the lifting connecting frame (104).

5. The L-shaped drilling platform robot three-dimensional space cable non-powered follow-up retraction device according to claim 2, characterized in that, The mounting bracket (101) has counterweight guide columns (109) connected to its two opposite inner walls along its length. The power counterweight block (108) has guide grooves (114) on its opposite sides, and the guide grooves (114) match the counterweight guide columns (109).

6. The L-shaped drilling platform robot three-dimensional space cable non-powered follow-up retraction device according to claim 2, characterized in that, The armored cable (2) includes a first cable assembly (201) and a second cable assembly (202) arranged side by side. The exterior of the first cable assembly (201) and the second cable assembly (202) is a cable tube (203). One end of the cable tube (203) passes through the fixed pulley assembly (102) and the movable pulley assembly (103) in sequence and is connected to the mounting bracket (101). The other end of the cable tube (203) is connected to the cable connection steering mechanism (4). The cable tube (203) of the first cable assembly (201) is filled with a power cable (204), and the cable tube (203) of the second cable assembly (202) is filled with a communication cable (205). The cable tube (203) is located above the cable guide mechanism (3).

7. The L-shaped drilling platform robot three-dimensional space cable non-powered follow-up retraction device according to claim 6, characterized in that, The cable guiding mechanism (3) includes several parallel roller brackets (301), each roller bracket (301) is connected to a roller (302), and the roller bracket (301) is located between the mounting bracket (101) and the cable connection turning mechanism (4); It also includes an inner turning guide bracket (303) and an outer turning guide bracket (305) arranged parallel to each other. The inner turning guide bracket (303) and the outer turning guide bracket (305) are arranged between two of the roller brackets (301). The inner turning guide bracket (303) is evenly connected with a number of inner turning guide rollers (304) along its length direction. The outer turning guide bracket (305) is evenly connected with a number of outer turning guide rollers (306) along its length direction. The cable hose (203) is arranged above the roller (302).

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