Cable trench excavation aid

Abstract

The utility model discloses a cable trench excavation auxiliary device relates to the technical field of cable construction equipment, and it includes car body, telescopic structure, displacement mechanism, elevating system and detection mechanism, telescopic structure includes sleeve and connecting rod, sleeve rotation is connected in car body upper portion, and connecting rod one end slip connection is in sleeve, and the other end extends sleeve outside and rotation is connected in ditcher's mechanical arm lower portion, elevating system includes elevating column and elevating platform, and elevating column one end is fixed in car body bottom, and elevating platform is fixed in the other end of elevating column, detection mechanism is installed in elevating platform bottom, is used as detecting the pipeline situation in the ground, and displacement mechanism sets up in car body, is used as moving car body. The application has the effect of reducing the pipeline breakage due to accident when excavating the cable trench.

Description

Technical Field

[0001] This application relates to the field of cable construction equipment technology, and in particular to an auxiliary device for cable trench excavation. Background Technology

[0002] Cable trenches are underground pipelines used for laying and replacing power or telecommunications cables. Excavation of cable trenches is a fundamental operation for laying underground pipelines. Currently, the mainstream excavation method mainly relies on a combination of manual labor and general machinery. That is, trenching machines and other equipment are used for the main excavation, while manual cleaning is used for detailed cleaning in complex pipeline areas.

[0003] Nowadays, urban underground space resources are becoming increasingly scarce, and various existing pipelines (such as power cables, communication optical cables, gas pipelines, etc.) are densely distributed. Before excavating cable trenches, construction workers mainly rely on consulting pipeline drawings and manual exploration to locate pipelines.

[0004] However, even with preliminary surveys, during mechanical excavation, the trenching machine itself lacks the ability to perceive unknown risks ahead in real time. Therefore, operators can only rely on experience and known drawing information to operate the machine. There is a risk of accidentally digging through pipelines due to visual errors, errors in marking on old drawings, or unexpected deviations of underground pipelines, which could lead to large-scale power outages, communication interruptions, etc. Therefore, this application proposes a new technical solution. Utility Model Content

[0005] To reduce the risk of cutting pipelines during cable trench excavation, this application provides an auxiliary device for cable trench excavation.

[0006] This application provides an auxiliary device for cable trench excavation, which adopts the following technical solution: An auxiliary device for cable trench excavation includes a vehicle body, a telescopic structure, a displacement mechanism, a lifting mechanism, and a detection mechanism. The telescopic structure includes a sleeve and a connecting rod. The sleeve is rotatably connected to the upper part of the vehicle body. One end of the connecting rod is slidably connected to the sleeve, and the other end extends out of the sleeve and is rotatably connected to the lower part of the trencher's robotic arm. The lifting mechanism includes a lifting column and a lifting platform. One end of the lifting column is located at the bottom of the vehicle body, and the lifting platform is fixed to the other end of the lifting column. The detection mechanism is installed at the bottom of the lifting platform and is used to detect underground pipelines. The displacement mechanism is located on the vehicle body and is used to move the vehicle body.

[0007] Optionally, a counterweight is installed at the bottom of the vehicle body. The displacement mechanism consists of four sets, with two sets installed on each side of the vehicle body. The displacement mechanism includes a telescopic rod with a telescopic structure, a guide rod, a motor, a vertical plate, and wheels. The vertical plate is located below the vehicle body. One end of the guide rod slides through the bottom of the vehicle body, and the other end is fixedly connected to the upper end of the vertically installed vertical plate. One end of the telescopic rod is rotatably connected to the bottom of the vehicle body, and the other end is rotatably connected to the upper end of the vertical plate. The telescopic rod is fitted with a spring connecting the upper and lower ends. The motor is installed on the vertical plate, and the motor output shaft is coaxially fixed with the wheels.

[0008] Optionally, the vehicle body is equipped with a distance control mechanism, which includes a distance measuring sensor, a telescopic rod II, and a baffle. The baffle is located on the side of the trencher facing the vehicle body, the distance measuring sensor is located on the side of the vehicle body facing the baffle, and the detection end faces the baffle. The telescopic rod II is a telescopic structure, with one end connected to the vehicle body and the other end facing the baffle. The telescopic rod II is fitted with a spring II on its telescopic extension arm.

[0009] Optionally, the vehicle body is also provided with a moving mechanism for adjusting the detection position of the ranging sensor. The moving mechanism includes a base, a mounting bracket, and a reciprocating assembly. The base is fixed to the side of the vehicle body facing the baffle, and two fixing blocks are fixedly connected to the side wall of the base. The two fixing blocks have transverse insertion holes, and crossbars slide through the two insertion holes respectively. The ends of the two crossbars that are close to each other are fixedly connected to the mounting bracket. The ranging sensor is mounted on the mounting bracket, and the reciprocating assembly is provided on the side wall of the base for driving the mounting bracket to move back and forth.

[0010] Optionally, the reciprocating assembly includes a rotary motor, an incomplete gear, and a rack. There are two racks, which are horizontally arranged on the upper and lower sides of the inner wall of the mounting frame, respectively. The rotary motor is fixed on the base, and its output shaft extends out of the base and is located inside the mounting frame. The incomplete gear is fixedly connected to the output shaft of the rotary motor and is located between the two racks, and meshes with either rack.

[0011] Optionally, the baffle is provided with a support plate for storing the vehicle body, and the end of the support plate extends upward to form a vertical extension.

[0012] Optionally, the sleeve is detachable from the vehicle body, and the sleeve and connecting rod are provided with pins for retracting and fixing the sleeve and connecting rod; the lower end of the sleeve is connected to a fixing structure for detachably connecting with the trenching machine's robotic arm, and the fixing structure is used to store the sleeve and connecting rod on the trenching machine's robotic arm.

[0013] Optionally, the fixing structure includes mounting beams, two vertical rods, and a horizontal plate that are respectively fixed laterally to both sides of the trencher's robotic arm. The two vertical rods are rotatably connected to the ends of the mounting beams, and the horizontal plate is fixed to the ends of the two vertical rods away from the mounting beams by bolts.

[0014] In summary, this application includes the following beneficial technical effects: This application enables the vehicle body to move along with the trencher during excavation, and the detection mechanism can detect the current underground pipeline distribution before excavation. Once the underground pipeline is detected, the operator in the cab will be promptly prompted to stop digging, thereby reducing the risk of the operator cutting the pipeline during cable trench excavation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this application.

[0016] Figure 2 This is a structural schematic diagram of the vehicle body in this application.

[0017] Figure 3 This is a schematic diagram of the displacement mechanism of this application.

[0018] Figure 4 This is a schematic diagram of the detection mechanism, lifting mechanism and distance control mechanism of this application.

[0019] Figure 5 This is a schematic diagram of the structure of the mobile mechanism of this application.

[0020] Figure 6 This is a schematic diagram of the controller in this application.

[0021] Figure 7 This is a schematic diagram of the vehicle body in its stowed state as described in this application.

[0022] Figure 8 yes Figure 7 A magnified view of part A in the diagram.

[0023] Explanation of reference numerals in the attached drawings: 1. Vehicle body; 2. Telescopic structure; 21. Sleeve; 22. Connecting rod; 3. Displacement mechanism; 31. Telescopic rod one; 32. Guide rod; 33. Motor; 34. Vertical plate; 35. Wheel; 4. Lifting mechanism; 41. Lifting column; 42. Lifting platform; 5. Detection mechanism; 51. Ground penetrating radar; 52. Electromagnetic sensor; 53. Controller; 6. Distance control mechanism; 61. Distance sensor; 62. Telescopic rod two; 63. Baffle; 631. Support plate; 7. Moving mechanism; 71. Base; 711. Fixing block; 72. Mounting bracket; 721. Crossbar; 73. Reciprocating assembly; 731. Rotary motor; 732. Incomplete gear; 733. Rack; 8. Fixed structure; 81. Mounting beam; 82. Vertical rod; 83. Crossbar. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0025] This application discloses an auxiliary device for cable trench excavation.

[0026] Reference Figure 1 and Figure 2 The cable trench excavation auxiliary device includes a vehicle body 1, a telescopic structure 2, a displacement mechanism 3, a lifting mechanism 4, and a detection mechanism 5. The vehicle body 1 is connected to the mechanical arm of the trenching machine through the telescopic structure 2. The telescopic structure 2 includes a sleeve 21 and a connecting rod 22. The sleeve 21 is hinged to the upper part of the vehicle body 1. One end of the connecting rod 22 is slidably connected to the sleeve 21, and the other end extends out of the sleeve 21 and is hinged to the lower part of the mechanical arm of the trenching machine. The reason for the hinge is that: during use, the mechanical arm of the trenching machine will swing up and down, so the vehicle body 1 and the mechanical arm of the trenching machine cannot be rigidly connected, and the connecting rod 22 can extend and retract within the sleeve 21, thereby preventing the vehicle body 1 from swinging too much and damaging the vehicle body 1 after the mechanical arm swings. Reference Figure 3 The displacement mechanism 3 consists of four sets, with two sets installed on one side of the bottom of the vehicle body 1. The displacement mechanism 3 includes a telescopic rod 31, a guide rod 32, a motor 33, a vertical plate 34, and a wheel 35. The guide rod 32 is vertically arranged, with one end sliding through the bottom of the vehicle body 1 and the other end fixed to the upper end of the vertically installed vertical plate 34. The telescopic rod 31 is a telescopic structure, which includes a main rod and an inner rod sliding through the main rod. The main rod of the telescopic rod 31 is hinged to the upper end of the vertical plate 34, and the inner rod of the telescopic rod 31 is hinged to the bottom of the vehicle body 1. A spring 1 is installed on the telescopic rod 31, connecting the two ends of the telescopic rod 31 that are far apart from each other. The motor 33 is installed on the side of the vertical plate 34, and the output shaft of the motor 33 extends outward from the vertical plate 34. The wheel 35 is coaxially fixed to the output shaft of the motor 33. The reason for this design is that, during use, vehicle 1 may drive onto uneven roads. In order to keep vehicle 1 stable and not affect the normal operation of the subsequent detection mechanism 5, each telescopic rod 31 needs to be elastically connected to vehicle 1, so that all wheels 35 on vehicle 1 can play a shock-absorbing role. At the same time, in order to achieve a better shock-absorbing effect, counterweights are also set at the front and rear ends of the bottom of vehicle 1, making it easier for the center of gravity of vehicle 1 to remain stable. Reference Figure 4In order to make the detection mechanism 5 close to the ground surface when detecting underground conditions and to make the detection results more accurate, a lifting mechanism 4 is installed at the bottom of the vehicle body 1. The lifting mechanism 4 includes a lifting column 41 and a lifting platform 42. There are two lifting columns 41, with the upper end threaded to the vehicle body 1 and the lower end rotatably connected to the lifting platform 42. The lifting platform 42 has space for the installation of the detection mechanism 5. Before using the detection mechanism 5, the operator can rotate the two lifting columns 41 simultaneously to adjust the lifting platform 42 to a suitable height, so that the detection mechanism 5 is close to the ground surface and can more accurately detect the underground pipeline conditions.

[0027] Reference Figure 6 In this embodiment, the detection mechanism 5 includes a ground-penetrating radar 51, an electromagnetic sensor 52, and a controller 53. The controller 53 is electrically connected to a display, which is installed in the trencher cab for operator use. The ground-penetrating radar 51 and the electromagnetic sensor 52 are fixed to the bottom of the lifting platform 42. The ground-penetrating radar 51 is mainly used to detect the distribution of non-metallic pipelines (such as plastic gas pipes, cement pipes, etc.) underground where the vehicle body 1 is located, and the electromagnetic sensor 52 is mainly used to detect the distribution of metallic pipelines (such as cables, metal pipes, etc.) underground where the vehicle body 1 is located. The controller 53 is electrically connected to the trencher's control system, the display, and the ground-penetrating radar 51 and electromagnetic sensor 52. The controller 53 can be a PLC controller, an MCU controller, etc., and can be installed in the trencher cab. The operator can pre-set the controller 53 to display the feedback from the ground-penetrating radar 51 and the electromagnetic sensor 52 on the display, and control the motor 33 to start and stop according to the feedback. Example: If the signals fed back by the ground-penetrating radar 51 and the electromagnetic sensor 52 indicate the presence of underground pipelines, then the control motor 33 will stop, causing the vehicle body 1 to stop moving, and a prompt message will be sent to the display, such as a pop-up warning.

[0028] Based on the above settings, this design allows the vehicle body 1 to move along with the trencher during excavation. Furthermore, by detecting the distribution of underground pipelines through the ground-penetrating radar 51 and electromagnetic sensor 52, the system will prompt the personnel in the cab to stop digging once underground pipelines are detected, thereby reducing the risk of operators accidentally cutting pipelines during cable trench excavation.

[0029] Since the vehicle body 1 is connected to the mechanical arm of the trencher through the telescopic structure 2, when the excavator suddenly stops, the vehicle body 1 will continue to move forward due to inertia, which may cause it to collide with the excavator. Therefore, a distance control mechanism 6 is also installed on the vehicle body 1. The distance control mechanism 6 includes a distance sensor 61 and a telescopic rod 62. In this embodiment, the ranging sensor 61 can be a laser ranging sensor, an infrared ranging sensor, or the like. The ranging sensor 61 is fixed to the end of the vehicle body 1 facing the trencher and is electrically connected to the controller 53. One end of the telescopic rod 62 is connected to the end of the vehicle body 1 near the trencher, and the other end of the rod, which is used for telescopic movement, is equipped with a buffer pad (such as a rubber pad) and abuts against a baffle 63 pre-set on the trencher. A spring 2 is sleeved on the part of the telescopic rod 62 that extends out of the rod. The baffle 63 is flat, with one side of the baffle 63 fixed to the vehicle body of the trencher and the other side facing the ranging sensor 61, so that the ranging sensor 61 can set the reference plane for distance measurement. In this embodiment, the distance sensor 61 is used to measure the distance between the vehicle body 1 and the baffle 63, and the operator pre-sets the controller 53 to control the speed of the motor 33 according to the distance between the vehicle body 1 and the baffle 63, that is, to control the motor 33 to move the vehicle body 1 according to the set initial distance, so as to ensure that the distance between the vehicle body 1 and the baffle 63 always remains at the set initial distance. To prevent the vehicle body 1 from impacting the baffle 63 when the ranging sensor 61 malfunctions, a telescopic rod 62 is designed to abut against the baffle 63, thereby buffering the impact of the vehicle body 1 on the baffle 63 and protecting the vehicle body 1. It also prevents the accuracy of the detection mechanism 5 from being affected when the vehicle body 1 moves significantly.

[0030] It is understandable that when the robotic arm swings, due to factors such as uneven road surface and the turning of the trencher, the vehicle body 1 following the trencher will inevitably sway slightly from side to side or deviate laterally, which may affect the inaccuracy of the measurement of the distance sensor 61 or prevent the distance sensor 61 from aligning with the baffle 63. Therefore, a moving mechanism 7 for adjusting the detection position of the distance sensor 61 is also provided on the vehicle body 1.

[0031] Reference Figure 5 The moving mechanism 7 includes a base 71, a mounting frame 72, and a reciprocating assembly 73. The base 71 is fixed to the side of the vehicle body 1 facing the baffle 63, and two fixing blocks 711 are fixedly connected to the side wall of the base 71. Insertion holes are opened laterally in the two fixing blocks 711, and crossbars 721 are slidably inserted into the two insertion holes respectively. The ends of the two crossbars 721 that are close to each other are fixed to the left and right sides of the mounting frame 72 respectively. The ranging sensor 61 is installed in the center of the mounting frame 72. The reciprocating assembly 73 includes a rotary motor 731, an incomplete gear 732, and two racks 733. The two racks 733 are horizontally fixed to the upper and lower sides of the inner wall of the mounting bracket 72, respectively. The rotary motor 731 is fixed to the base 71 and located inside the mounting bracket 72, and the output shaft of the rotary motor 731 extends into the mounting bracket 72. The incomplete gear 732 is coaxially fixed to the output shaft of the rotary motor 731. The incomplete gear 732 is located between the two racks 733 and always meshes with either of the racks 733.

[0032] In use: The rotary motor 731 drives the incomplete gear 732 to rotate according to a pre-set speed, causing any rack 733 to move the mounting bracket 72 to the left or right, thereby achieving lateral adjustment of the detection position of the distance sensor 61. The operator can pre-set the controller 53 to control the start and stop of the rotary motor 731 based on the distance value fed back by the distance sensor 61. For example, if the detection value fed back by the distance sensor 61 changes abruptly or loses signal, it can be determined that the distance laser point may have hit the edge of the baffle 63 or missed, and then the rotary motor 731 is controlled to rotate to adjust the position of the distance sensor 61; when the distance value becomes stable, it means that the sensor has been re-aligned with the center of the baffle 63, and then the rotary motor 731 is controlled to stop. The above settings can prevent the entire distance control mechanism 6 from failing due to a brief positional shift or the controller 53 from issuing incorrect commands to the motor 33.

[0033] It is understandable that staff can pre-configure the controller 53 to achieve the above functions, and the above configuration methods can all be implemented using existing technologies, so they will not be described in detail here.

[0034] Reference Figure 7 and Figure 8 To facilitate carrying and improve construction efficiency, the part of the sleeve 21 that is hinged to the vehicle body 1 can be detached from the vehicle body 1, so that the operator can disassemble or store the vehicle body 1. Specifically, an insertion slot is pre-set on the vehicle body 1, and threaded holes are provided on both sides of the insertion slot. Two upright plates are inserted into the insertion slot and fastened with screws on both sides of the upright plates. A horizontal shaft is inserted inside the sleeve 21, and the two ends of the horizontal shaft are threaded to the two upright plates respectively. When disassembling, simply remove the screws, pull the upright plate out of the vehicle body 1, and rotate the horizontal shaft to remove it, so that the sleeve 21 can be separated from the horizontal shaft. Furthermore, pins are provided on the sleeve 21 and the connecting rod 22, so that when the connecting rod 22 is extended or retracted inside the sleeve 21, the connecting rod 22 can be fixed inside the sleeve 21 with the pins.

[0035] Correspondingly, a support plate 631 for storing the vehicle body 1 is provided on the baffle 63. The end of the support plate 631 is fixed to the side of the baffle 63 facing the vehicle body 1, and the other end of the support plate 631 extends upward to form a vertical extension. A fixing structure 8 is designed on the mechanical arm of the trencher. The fixing structure 8 includes a mounting beam 81 fixed to both sides of the mechanical arm in the transverse direction, a vertical rod 82 rotatably connected to the mounting beam 81, and a horizontal plate 83 for fixing the vertical rod 82. Bolts are threaded through the positions where the two vertical rods 82 abut against the horizontal plate 83, so that the horizontal plate 83 and the vertical rod 82 can be detachably connected.

[0036] Example: After the excavation task is completed, the sleeve 21 is disassembled from the vehicle body 1, the connecting rod 22 is retracted into the sleeve 21, and the sleeve 21 and the connecting rod 22 are fixed together with the pins pre-set on the sleeve 21. Then, the sleeve 21 is rotated close to the two vertical rods 82 on the robotic arm, the horizontal plate 83 is abutted against the lower end of the sleeve 21, and fixed to the vertical rod with bolts, so that the lower end of the sleeve 21 abuts against the robotic arm, thus completing the storage of the sleeve 21. Next, the vehicle body 1 is placed horizontally on the support plate 631 of the baffle 63. Specifically, when placing it, the gap between the lifting platform 42 and the vehicle body 1 is made to pass through the support plate 631, so that the bottom of the vehicle body 1 is placed on the upper part of the support plate 631. The reason for this placement is to make the vehicle body 1 more stable when placed on the support plate 631, and to avoid the detection mechanism 5 being squeezed by the weight of the vehicle body 1 itself, thereby protecting the detection mechanism 5.

[0037] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An auxiliary device for cable trench excavation, characterized in that: The device includes a vehicle body (1), a telescopic structure (2), a displacement mechanism (3), a lifting mechanism (4), and a detection mechanism (5). The telescopic structure (2) includes a sleeve (21) and a connecting rod (22). The sleeve (21) is rotatably connected to the upper part of the vehicle body (1). One end of the connecting rod (22) is slidably connected to the sleeve (21), and the other end extends out of the sleeve (21) and is rotatably connected to the lower part of the mechanical arm of the trencher. The lifting mechanism (4) includes a lifting column (41) and a lifting platform (42). One end of the lifting column (41) is located at the bottom of the vehicle body (1), and the lifting platform (42) is fixed to the other end of the lifting column (41). The detection mechanism (5) is installed at the bottom of the lifting platform (42) and is used to detect underground pipelines. The displacement mechanism (3) is located on the vehicle body (1) and is used to move the vehicle body (1).

2. The cable trench excavation auxiliary device according to claim 1, characterized in that: The bottom of the vehicle body (1) is equipped with a counterweight block. The displacement mechanism (3) consists of four sets, with two sets installed on one side of the vehicle body (1). The displacement mechanism (3) includes a telescopic rod (31) with a telescopic structure, a guide rod (32), a motor (33), a vertical plate (34), and a wheel (35). The vertical plate (34) is located below the vehicle body (1). One end of the guide rod (32) slides through the bottom of the vehicle body (1), and the other end is fixedly connected to the upper end of the vertically installed vertical plate (34). One end of the telescopic rod (31) is rotatably connected to the bottom of the vehicle body (1), and the other end is rotatably connected to the upper end of the vertical plate (34). The telescopic rod (31) is fitted with a spring connected to the upper and lower ends. The motor (33) is installed on the vertical plate (34), and the output shaft of the motor (33) is coaxially fixed with the wheel (35).

3. The cable trench excavation auxiliary device according to claim 1, characterized in that: The vehicle body (1) is provided with a distance control mechanism (6), which includes a distance sensor (61), a telescopic rod (62), and a baffle (63). The baffle (63) is located on the side of the trencher facing the vehicle body (1). The distance sensor (61) is located on the side of the vehicle body (1) facing the baffle (63), and the detection end is facing the baffle (63). The telescopic rod (62) is a telescopic structure, with one end connected to the vehicle body (1) and the other end facing the baffle (63). The telescopic rod (62) is used as a telescopic rod with a spring on its outer sleeve.

4. The cable trench excavation auxiliary device according to claim 3, characterized in that: The vehicle body (1) is also provided with a moving mechanism (7) for adjusting the detection position of the ranging sensor (61). The moving mechanism (7) includes a base (71), a mounting frame (72), and a reciprocating assembly (73). The base (71) is fixed to the side of the vehicle body (1) facing the baffle (63), and two fixing blocks (711) are fixedly connected to the side wall of the base (71). The two fixing blocks (711) have horizontally opened insertion holes, and crossbars (721) slide through the two insertion holes respectively. The ends of the two crossbars (721) that are close to each other are fixedly connected to the mounting frame (72). The ranging sensor (61) is installed on the mounting frame (72). The reciprocating assembly (73) is provided on the side wall of the base (71) for driving the mounting frame (72) to move back and forth.

5. The cable trench excavation auxiliary device according to claim 4, characterized in that: The reciprocating assembly (73) includes a rotary motor (731), an incomplete gear (732), and a rack (733). There are two racks (733) arranged horizontally on the upper and lower sides of the inner wall of the mounting frame (72). The rotary motor (731) is fixed on the base (71), and its output shaft extends out of the base (71) and is located inside the mounting frame (72). The incomplete gear (732) is fixedly connected to the output shaft of the rotary motor (731). The incomplete gear (732) is located between the two racks (733) and meshes with either rack (733).

6. The cable trench excavation auxiliary device according to claim 3, characterized in that: The baffle (63) is provided with a support plate (631) for storing the vehicle body (1), and the end of the support plate (631) extends upward to form a vertical extension.

7. The cable trench excavation auxiliary device according to claim 1, characterized in that: The sleeve (21) is detachable from the vehicle body (1). The sleeve (21) and the connecting rod (22) are provided with pins for retracting and fixing the sleeve (21) and the connecting rod (22). The lower end of the sleeve (21) is connected to a fixing structure (8) for detachably connecting with the trenching machine's robotic arm. The fixing structure (8) is used to store the sleeve (21) and the connecting rod (22) on the trenching machine's robotic arm.

8. The cable trench excavation auxiliary device according to claim 7, characterized in that: The fixed structure (8) includes a mounting beam (81), two vertical rods (82) and a horizontal plate (83) respectively fixed laterally to both sides of the trencher arm. The two vertical rods (82) are rotatably connected to the ends of the mounting beams (81), and the horizontal plate (83) is fixed to the ends of the two vertical rods (82) away from the mounting beams (81) by bolts.

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