Mechanical pipe moving device for oil field workover treatment

Abstract

The utility model belongs to the technical field of oil field workover treatment related equipment, in particular to a mechanical pipe moving device for oil field workover treatment, which is characterized in that a transverse pulley structure comprises a transverse pulley track frame, a pulley, a pulley driving component, an auxiliary support roller and a plurality of electric push rods, the longitudinal supporting guide pipe structure comprises a plurality of longitudinal supporting guide pipes, a plurality of corner supporting assemblies and a plurality of auxiliary supporting assemblies. Through the matching arrangement of the transverse pulley structure and the longitudinal supporting guide pipe structure, the electric push rod can push an oil rod or an oil pipe, and the oil rod or the oil pipe can automatically roll to a designated position, so that the labor intensity of pipe arrangement of workers is reduced, the workers do not need to walk back and forth, and the physical output of pulling the oil rod or the oil pipe back and forth by the workers is reduced; and meanwhile, operation safety is guaranteed, and the device is reasonable in overall design, can be adjusted according to well site ground conditions, is easy and convenient to operate, and is ideal special equipment in oil field well repair operation.

Description

Technical Field

[0001] This utility model belongs to the technical field of equipment related to oilfield well repair operations, specifically a mechanical pipe moving device for oilfield well repair operations. Background Technology

[0002] In current oilfield well workover operations, the pulling in and out of rods or tubing requires workers to perform physically demanding tasks such as pushing, pulling, and repositioning the rods or tubing. For example, when pulling in rods or tubing from a 2000-meter-deep well, workers must manually pull the rods and tubing and reposition them to the tubing bank, requiring them to walk approximately 35 kilometers. This work is physically demanding and lacks safety guarantees. Furthermore, the well site is generally uneven, requiring existing equipment to be leveled before operations can proceed, further increasing the labor intensity and workload. Utility Model Content

[0003] To address the aforementioned problems, the purpose of this utility model is to provide a mechanical pipe moving device for oilfield well workover operations.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A mechanical pipe moving device for well workover operations in oilfields includes a transverse trolley structure and a longitudinal support conduit structure. The transverse trolley structure includes a transverse trolley track frame, a trolley, a trolley drive assembly, auxiliary support rollers, and several electric push rods. The trolley drive assembly is mounted on the transverse trolley track frame and is used to drive the trolley to move laterally along the length of the transverse trolley track frame. The trolley is used to support one end of a rod or tubing lifted from the well. The auxiliary support rollers are mounted on the transverse trolley track frame near the wellhead and are used to assist in supporting the rod or tubing removed from the lifting clamp. Each of the electric push rods is mounted on the transverse trolley track frame and is used to push the rod or tubing supported by the trolley and auxiliary support rollers toward the longitudinal support conduit structure. The rod or tubing pushed by the electric push rods rolls on the longitudinal support conduit structure to the pipe bank.

[0006] The trolley drive assembly includes a base bracket, a motor, an electromagnetic clutch, a drive sheave, a driven sheave, and a wire rope. A wire rope passage groove is formed on the top surface of the transverse trolley track along its length. The driven sheave is rotatably disposed in the wire rope passage groove and is located on the transverse trolley track near the oilfield wellhead. The base bracket is installed at the end of the transverse trolley track away from the oilfield wellhead. The motor housing is mounted on the base bracket via a motor frame. The base bracket also has a drive sheave mounting shaft, on which the drive sheave is rotatably disposed. The drive end of the motor is connected to the drive sheave via the electromagnetic clutch. The wire rope passes over both the drive and driven sheaves and is fixedly connected to the trolley.

[0007] The motor, electromagnetic clutch, and electric push rod are each controlled by an external controller, which communicates with the remote controller.

[0008] There are two auxiliary support rollers, which are located on both sides of the wire rope passing through the groove.

[0009] The trolley is divided into a horizontal section and two vertical sections, forming an inverted U-shape. The two vertical sections are connected to both sides of the horizontal section, and the lower ends of the two vertical sections extend to both sides of the transverse trolley track frame along their length. Each of the two vertical sections is equipped with several pulley wheels, and each pulley wheel rolls on the top surface of the transverse trolley track frame. The height of the horizontal section of the trolley is higher than the height of the highest point of the auxiliary support roller.

[0010] A vertical baffle is fixed to the top surface of the horizontal part of the trolley, and a limiting groove is formed in the middle of the top surface of the horizontal part of the trolley for supporting and limiting one end of the oil rod or oil pipe.

[0011] The longitudinal support conduit structure includes several longitudinal support conduits, several corner support components, and several auxiliary support components; each of the longitudinal support conduits is arranged in parallel on the same side of the transverse trolley track frame along its length direction, each of the electric push rods is located on the other side of the transverse trolley track frame along its length direction, the length direction of each electric push rod and the length direction of each longitudinal support conduit are perpendicular to the length direction of the transverse trolley track frame, one end of the length direction of each longitudinal support conduit is located near the transverse trolley track frame, and the other end of the length direction of each longitudinal support conduit is located near the pipe bank;

[0012] The corner support assembly and the auxiliary support assembly are used to support each of the longitudinal support conduits.

[0013] The longitudinal support conduit located on the side closest to the oilfield wellhead has two ends supported by one corner support assembly, and the middle of the longitudinal support conduit located on the side closest to the oilfield wellhead has several auxiliary support assemblies.

[0014] The longitudinal support conduit located on the side furthest from the wellhead has two ends supported by a corner support assembly, and the middle of the longitudinal support conduit located on the side furthest from the wellhead has several auxiliary support assemblies.

[0015] Except for one longitudinal support conduit located on the side closest to the wellhead and one longitudinal support conduit located on the side furthest from the wellhead, the remaining longitudinal support conduits are supported by several auxiliary support components.

[0016] The corner support assembly includes a base A, a manual jack, and a U-shaped support fork A. The base A is placed on the ground, and the outer shell of the manual jack is installed on the base A. The drive end of the manual jack faces vertically upward and is connected to the U-shaped support fork A. The U-shaped support fork A is used to directly lock and support the longitudinal support guide tube.

[0017] The auxiliary support assembly includes a base B, a support sleeve, a nut mounting sleeve, a lead screw nut, a lead screw, and a U-shaped support fork block B. The base B is placed on the ground, the bottom of the support sleeve is fixed to the base B, and the top of the support sleeve forms an opening. The nut mounting sleeve is fixed to the top opening of the support sleeve, the lead screw nut is rotatably disposed in the nut mounting sleeve, and the outer circumference of the lead screw nut is provided with several rotating handles. The lead screw and the lead screw nut are connected by threads, the lower end of the lead screw extends into the support sleeve, and the upper end of the lead screw is connected to the U-shaped support fork block B. The U-shaped support fork block B is used to directly clamp and support the longitudinal support guide tube.

[0018] The advantages and positive effects of this utility model are as follows:

[0019] This invention, through the combined arrangement of a transverse pulley structure and a longitudinal support guide tube structure, enables an electric push rod to push an oil rod or tubing, and automatically roll the oil rod or tubing to a designated position. This saves workers the labor intensity of maneuvering the tubing, eliminates the need for workers to walk back and forth, reduces the physical exertion of pulling the oil rod or tubing, increases work efficiency, and ensures operational safety. The device has a reasonable overall design and can be adjusted according to the well site conditions. It is easy to operate and is an ideal special equipment for oilfield well workover operations. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the arrangement structure of the trolley drive assembly of this utility model;

[0022] Figure 3 This is a schematic diagram of the arrangement structure of the trolley and transverse trolley track frame of this utility model;

[0023] Figure 4 This is a schematic diagram of the corner support component of this utility model.

[0024] Figure 5 This is one of the schematic diagrams showing the arrangement structure of the auxiliary support component of this utility model;

[0025] Figure 6 This is the second schematic diagram of the auxiliary support component of this utility model.

[0026] In the diagram: 1 is the transverse trolley track frame, 101 is the wire rope through the groove, 2 is the trolley, 3 is the auxiliary support roller, 4 is the electric push rod, 5 is the base bracket, 6 is the motor, 7 is the electromagnetic clutch, 8 is the driving rope wheel, 9 is the driven rope wheel, 10 is the wire rope, 11 is the motor frame, 12 is the driving rope wheel mounting shaft, 13 is the trolley wheel, 14 is the vertical baffle, 15 is the longitudinal support guide tube, 16 is the corner support assembly, 1601 is the base A, 1602 is the manual jack, 1603 is the U-shaped support fork block A, 17 is the auxiliary support assembly, 1701 is the base B, 1702 is the support sleeve, 1703 is the nut mounting sleeve, 1704 is the lead screw nut, 1705 is the lead screw, 1706 is the U-shaped support fork block B, and 1707 is the rotating handle. Detailed Implementation

[0027] The following is in conjunction with the appendix Figure 1-6 The present invention will be described in further detail.

[0028] A mechanical pipe-moving device for oilfield well workover operations, such as Figure 1-6As shown, this embodiment includes a transverse trolley structure and a longitudinal support conduit structure. The transverse trolley structure includes a transverse trolley track frame 1, a trolley 2, a trolley drive assembly, auxiliary support rollers 3, and two electric push rods 4. The trolley drive assembly is mounted on the transverse trolley track frame 1 and is used to drive the trolley 2 to move along the length direction of the transverse trolley track frame 1, i.e., laterally. The trolley 2 is used to support one end of the oil rod or tubing lifted from the well. The auxiliary support rollers 3 are mounted on the transverse trolley track frame 1 near the wellhead and are used to assist in supporting the other end of the oil rod or tubing removed from the lifting clamp. Each electric push rod 4 is mounted on the transverse trolley track frame 1 and is used to push the oil rod or tubing supported by the trolley 2 and the auxiliary support rollers 3 toward the longitudinal support conduit structure. The oil rod or tubing pushed by the electric push rods 4 rolls on the longitudinal support conduit structure to the tubing bank. The longitudinal direction is perpendicular to the length direction of the transverse trolley track frame 1.

[0029] Specifically, such as Figure 2As shown, in this embodiment, the trolley drive assembly includes a base bracket 5, a motor 6, an electromagnetic clutch 7, a drive pulley 8, a driven pulley 9, and a wire rope 10. A wire rope through groove 101 is formed on the top surface of the transverse trolley track 1 along its length. The driven pulley 9 is rotatably disposed in the wire rope through groove 101 and is located on the transverse trolley track 1 near the oilfield wellhead. The base bracket 5 is installed at the end of the transverse trolley track 1 furthest from the oilfield wellhead. The housing of the motor 6 is mounted on the base bracket 5 via a motor frame 11. The base bracket 5 also has a drive pulley mounting shaft 12, on which the drive pulley 8 is rotatably disposed. The drive end of the motor 6 is connected to the drive pulley 8 via the electromagnetic clutch 7. The wire rope 10 passes over the drive pulley 8 and the driven pulley 9 respectively and is fixedly connected to the trolley 2. When the electromagnetic clutch 7 connects the drive end of the motor 6 to the drive pulley 8, the motor 6 is activated, and the drive pulley 8 rotates via the electromagnetic clutch 7, thus enabling the wire rope 10 to be wound and unwound. The wire rope 10 pulls the trolley 2 to move on the transverse trolley track frame 1. When the electromagnetic clutch 7 disconnects the drive end of the motor 6 from the drive pulley 8, both the drive pulley 8 and the driven pulley 9 can rotate freely. Two auxiliary support rollers 3 are provided, located on both sides of the wire rope through groove 101 to fully support the oil rod or oil pipe. In this embodiment, the motor 6, electromagnetic clutch 7, and electric push rod 4 are controlled by an external controller. The external controller communicates with the remote controller. The motor 6, electromagnetic clutch 7, and electric push rod 4 are all commercially available products. The electrical connection and communication method between the external controller and the aforementioned components and external power supply adopt existing technology. The remote controller itself adopts existing technology and can be equipped with buttons for controlling the operation of the motor 6, electromagnetic clutch 7, and electric push rod 4, as well as a power switch button. Staff can easily control the motor 6, electromagnetic clutch 7, and electric push rod 4 directly via remote control without having to move around frequently.

[0030] Specifically, such as Figure 3As shown, in this embodiment, the trolley 2 is divided into a horizontal section and two vertical sections, forming an inverted U-shape. The two vertical sections of the trolley 2 are respectively connected to both sides of the horizontal section, and the lower ends of the two vertical sections extend to both sides of the transverse trolley track 1 along its length to limit movement and prevent it from falling off. Several pulley wheels 13 are provided on each of the two vertical sections of the trolley 2, and each pulley wheel 13 rolls on the top surface of the transverse trolley track 1, allowing the trolley 2 to move smoothly. The height of the horizontal section of the trolley 2 is higher than the highest point of the auxiliary support roller 3 to prevent collision and interference between the trolley 2 and the auxiliary support roller 3 during movement. In this embodiment, a vertical baffle 14 is fixed to the top surface of the horizontal part of the pulley 2 to hold one end of the oil rod or tubing lifted from the well. A limiting groove is also formed in the middle of the top surface of the horizontal part of the pulley 2 to support and limit one end of the oil rod or tubing. The shape of the limiting groove can be set according to the shape of the oil rod or tubing to prevent the oil rod or tubing from falling off the pulley 2.

[0031] Specifically, such as Figure 1 As shown, in this embodiment, the longitudinal support conduit structure includes four longitudinal support conduits 15, four corner support assemblies 16, and twelve auxiliary support assemblies 17. Each longitudinal support conduit 15 is sequentially and parallelly arranged on the same side of the transverse trolley track 1 along its length. Each electric push rod 4 is located on the other side of the transverse trolley track 1 along its length. The length directions of each electric push rod 4 and each longitudinal support conduit 15 are perpendicular to the length direction of the transverse trolley track 1. One end of each longitudinal support conduit 15 is located near the transverse trolley track 1, and the other end is located near the pipe bank. The corner support assemblies 16 and auxiliary support assemblies 17 are used to support each longitudinal support conduit 15, and the oil rod or oil pipe rolls on each longitudinal support conduit 15.

[0032] In this embodiment, the longitudinal support conduit 15 located closest to the wellhead has two ends supported by corner support components 16, and the middle section of the same conduit is supported by three auxiliary support components 17. Similarly, the longitudinal support conduit 15 located furthest from the wellhead has two ends supported by corner support components 16, and the middle section of the same conduit is supported by three auxiliary support components 17. All other longitudinal support conduits 15, except for those located closest and furthest from the wellhead, are supported by three auxiliary support components 17. The longitudinal support conduits 15 closest and furthest from the wellhead, respectively, are used to support the ends of the rod or tubing, thus requiring greater load-bearing capacity. The middle longitudinal support conduit 15 provides relatively auxiliary support.

[0033] like Figure 4 As shown, in this embodiment, the corner support assembly 16 includes a base A 1601, a manual jack 1602, and a U-shaped support fork block A 1603. The base A 1601 is placed on the ground. The outer casing of the manual jack 1602 is mounted on the base A 1601. The drive end of the manual jack 1602 faces vertically upwards and is connected to the U-shaped support fork block A 1603. The U-shaped support fork block A 1603 is used to directly engage and support the longitudinal support guide tube 15. The manual jack 1602 is a commercially available product and can provide a large load-bearing capacity. By adjusting the manual jack 1602, the overall height of the corner support assembly 16 can be adjusted to adapt to different height requirements, thus accommodating relatively uneven ground.

[0034] like Figure 5 and Figure 6As shown, in this embodiment, the auxiliary support assembly 17 includes a base B 1701, a support sleeve 1702, a nut mounting sleeve 1703, a lead screw nut 1704, a lead screw 1705, and a U-shaped support fork block B 1706. The base B 1701 is placed on the ground. The bottom of the support sleeve 1702 is fixed to the base B 1701. The top of the support sleeve 1702 forms an opening. The nut mounting sleeve 1703 is fixed to the top opening of the support sleeve 1702. The lead screw nut 1704 is rotatably set in the nut mounting sleeve 1703. Two rotating handles 1707 are provided on the outer circumference of the lead screw nut 1704 to rotate the lead screw nut 1704. The lead screw 1705 is connected to the lead screw nut 1704 by threads. The lower end of the lead screw 1705 extends into the support sleeve 1702. The upper end of the lead screw 1705 is connected to the U-shaped support fork block B 1706. The U-shaped support fork block B 1706 is used to directly lock and support the longitudinal support guide tube 15. After the U-shaped support fork block B1706 locks and supports the longitudinal support guide tube 15, the height of the screw 1705 can be adjusted by rotating the screw nut 1704, thereby changing the overall height of the corresponding auxiliary support component 17 to adapt to different height requirements and thus adapt to relatively uneven ground.

[0035] Working principle:

[0036] Before performing rod or tubing tripping operations, place all components according to requirements and adjust the height of the corner support components 16 and auxiliary support components 17 so that the longitudinal support guides 15 gradually tilt downwards from the direction close to the transverse trolley rail frame 1 to the direction away from the transverse trolley rail frame 1. This allows the rod or tubing to roll from the transverse trolley rail frame 1 through the longitudinal support guides 15 to the tubing bank, moving the trolley 2 to the vicinity of the wellhead and disengaging the electromagnetic clutch 7. During rod or tubing tripping operations, the rod or tubing is lifted from the well by a crane using a lifting clamp, placing one end of the rod or tubing (at this time, the lower end) into the limiting slot of the trolley 2 and held in place by the vertical baffle 14. The crane then gradually tilts and lowers the rod or tubing, allowing one end of the rod or tubing to move downwards due to inertia. When the rod or tubing is pulled away from the wellhead by the pulley 2, and one end of the rod or tubing can no longer move on its own, the electromagnetic clutch 7 connects to the drive pulley 8 and the drive end of the motor 6, controlling the motor 6 to move the rod or tubing away from the wellhead and to the predetermined position. During the movement of the rod or tubing, the auxiliary support roller 3 provides auxiliary support for the rod or tubing. When the rod or tubing reaches the designated position, the clamp connected to the rod or tubing is removed, the motor 6 stops operating and the electromagnetic clutch 7 is disconnected, and the electric push rod 4 is activated to push the rod or tubing. The rod or tubing rolls on the longitudinal support guide structure to the tubing bank, completing one rod or tubing lifting operation.

Claims

1. A mechanical pipe-moving device for oilfield well workover operations, characterized in that: The system includes a transverse trolley structure and a longitudinal support guide structure. The transverse trolley structure includes a transverse trolley track frame (1), a trolley (2), a trolley drive assembly, auxiliary support rollers (3), and several electric push rods (4). The trolley drive assembly is mounted on the transverse trolley track frame (1) and is used to drive the trolley (2) to move laterally along the length of the transverse trolley track frame (1). The trolley (2) is used to support a rod or tubing lifted from the well. At the end, the auxiliary support roller (3) is set on the transverse trolley track frame (1) near the wellhead of the oil field. The auxiliary support roller (3) is used to assist in supporting the oil rod or tubing removed from the lifting clamp. Each of the electric push rods (4) is set on the transverse trolley track frame (1). The electric push rod (4) is used to push the oil rod or tubing supported by the trolley (2) and the auxiliary support roller (3) toward the longitudinal support conduit structure. The oil rod or tubing pushed by the electric push rod (4) rolls on the longitudinal support conduit structure to the pipe bank.

2. The mechanical pipe moving device for oilfield well workover operations according to claim 1, characterized in that: The trolley drive assembly includes a base bracket (5), a motor (6), an electromagnetic clutch (7), a drive pulley (8), a driven pulley (9), and a wire rope (10). A wire rope through groove (101) is formed on the top surface of the transverse trolley track frame (1) along its length. The driven pulley (9) is rotatably disposed in the wire rope through groove (101). The driven pulley (9) is located on the transverse trolley track frame (1) near the oilfield wellhead. The base bracket (5) is installed on the transverse trolley track. At one end of the track frame (1) away from the oilfield wellhead, the outer casing of the motor (6) is mounted on the base bracket (5) via the motor frame (11). The base bracket (5) is also provided with a drive rope wheel mounting shaft (12). The drive rope wheel (8) is rotatably mounted on the drive rope wheel mounting shaft (12). The drive end of the motor (6) is connected to the drive rope wheel (8) via the electromagnetic clutch (7). The wire rope (10) passes around the drive rope wheel (8) and the driven rope wheel (9) respectively and is fixedly connected to the pulley (2).

3. A mechanical pipe-moving device for oilfield well workover operations according to claim 2, characterized in that: The motor (6), electromagnetic clutch (7), and electric push rod (4) are controlled by an external controller, which communicates with the remote controller.

4. A mechanical pipe-moving device for oilfield well workover operations according to claim 2, characterized in that: There are two auxiliary support rollers (3), which are located on both sides of the wire rope passing groove (101).

5. A mechanical pipe-moving device for oilfield well workover operations according to claim 1, characterized in that: The trolley (2) is divided into a horizontal part and two vertical parts, and the whole forms an inverted U-shape. The two vertical parts of the trolley (2) are respectively connected to the two sides of the horizontal part of the trolley (2), and the lower ends of the two vertical parts of the trolley (2) extend to the two sides of the length direction of the transverse trolley track frame (1). Several pulley wheels (13) are provided on the two vertical parts of the trolley (2), and each pulley wheel (13) rolls on the top surface of the transverse trolley track frame (1). The height of the horizontal part of the trolley (2) is higher than the height of the highest point of the auxiliary support roller (3).

6. A mechanical pipe-moving device for oilfield well workover operations according to claim 5, characterized in that: A vertical baffle (14) is fixedly attached to the top surface of the horizontal part of the trolley (2), and a limiting groove for supporting and limiting one end of the oil rod or oil pipe is also formed in the middle of the top surface of the horizontal part of the trolley (2).

7. A mechanical pipe-moving device for oilfield well workover operations according to claim 1, characterized in that: The longitudinal support conduit structure includes several longitudinal support conduits (15), several corner support components (16), and several auxiliary support components (17); each of the longitudinal support conduits (15) is arranged in parallel on the same side of the transverse trolley track frame (1) along its length direction, and each of the electric push rods (4) is located on the other side of the transverse trolley track frame (1) along its length direction. The length directions of each electric push rod (4) and each of the longitudinal support conduits (15) are perpendicular to the length direction of the transverse trolley track frame (1). One end of each longitudinal support conduit (15) along its length direction is located near the transverse trolley track frame (1), and the other end of each longitudinal support conduit (15) along its length direction is located near the pipe bank. The corner support assembly (16) and the auxiliary support assembly (17) are used to support each of the longitudinal support conduits (15).

8. A mechanical pipe-moving device for oilfield well workover operations according to claim 7, characterized in that: The longitudinal support conduit (15) located on the side closest to the oil field wellhead has two ends supported by a corner support assembly (16) in the longitudinal direction, and the middle part of the longitudinal support conduit (15) located on the side closest to the oil field wellhead is supported by a number of auxiliary support assemblies (17). The longitudinal support conduit (15) located on the side furthest from the wellhead is supported at both ends by a corner support assembly (16), and the middle part of the longitudinal support conduit (15) located on the side furthest from the wellhead is supported by a number of auxiliary support assemblies (17). Except for one of the longitudinal support conduits (15) located on the side closest to the wellhead and the other of the longitudinal support conduits (15) located on the side furthest from the wellhead, the remaining longitudinal support conduits (15) are supported by several of the auxiliary support assemblies (17).

9. A mechanical pipe-moving device for oilfield well workover operations according to claim 7, characterized in that: The corner support assembly (16) includes a base A (1601), a manual jack (1602), and a U-shaped support fork block A (1603). The base A (1601) is placed on the ground. The outer shell of the manual jack (1602) is installed on the base A (1601). The drive end of the manual jack (1602) is vertically upward and connected to the U-shaped support fork block A (1603). The U-shaped support fork block A (1603) is used to directly lock and support the longitudinal support guide tube (15).

10. A mechanical pipe-moving device for oilfield well workover operations according to claim 7, characterized in that: The auxiliary support assembly (17) includes a base B (1701), a support sleeve (1702), a nut mounting sleeve (1703), a lead screw nut (1704), a lead screw (1705), and a U-shaped support fork block B (1706). The base B (1701) is placed on the ground. The bottom of the support sleeve (1702) is fixed to the base B (1701), and the top of the support sleeve (1702) forms an opening. The nut mounting sleeve (1703) is fixed to the top opening of the support sleeve (1702). The nut (1704) is rotatably mounted in the nut mounting sleeve (1703). The outer circumferential surface of the lead screw nut (1704) is provided with several rotating handles (1707). The lead screw (1705) is connected to the lead screw nut (1704) by a thread. The lower end of the lead screw (1705) extends into the support sleeve (1702). The upper end of the lead screw (1705) is connected to the U-shaped support fork block B (1706). The U-shaped support fork block B (1706) is used to directly lock and support the longitudinal support guide tube (15).

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