Shield cable tractor

Abstract

The utility model discloses a shield cable traction machine. The technical problem that the efficiency is low when a cable is pulled manually is solved. The two sides of the base are provided with side supporting frames, the two-way lead screw is correspondingly arranged between the two side supporting frames in a penetrating mode and provided with two threads in different directions, the two sides of the guide rod are arranged between the side supporting frames in a penetrating mode respectively, the two movable plates are used for moving along the guide rod, and clamping grooves are formed in the bottoms of the two movable plates. The two lead screw nuts are in corresponding threaded connection with threads in two different directions of the two-way lead screw and are clamped in corresponding clamping grooves of the moving plate, the pressure sensor is embedded between any lead screw nut and the groove wall of the clamping groove, the crawler belt conveying mechanism and the moving plate are relatively fixed, and the encoder is used for measuring the output length of a cable. The carrier roller assemblies are arranged on the two sides of the base and used for controlling the direction of the cable. According to the shield cable traction machine, traction conveying of the cable can be achieved, the clamping force of the crawler belt can be judged, and the problem of slipping between the crawler belt and the cable can be found in time.

Description

Technical Field

[0001] The present application relates to the technical field of shield supporting equipment, and in particular to a shield cable traction machine. Background Art

[0002] TBM cable is a high-performance cable designed for TBMs and is widely used in tunnel excavation projects such as subways, railways, and highways. As a key equipment in modern underground engineering, TBMs require cables with excellent performance to meet their special working environment.

[0003] TBM cables usually use high-purity copper conductors to ensure excellent electrical conductivity. At the same time, the insulation material of the cable uses special materials that are high temperature, wear-resistant, and anti-aging to ensure that it can withstand high temperature, high pressure, and frequent bending when the TBM is working. TBM cables also have excellent anti-electromagnetic interference performance to ensure the stability of signal transmission. In addition, the structural design of TBM cables is also very unique, usually using a multi-core structure to meet the multi-system and multi-function requirements of TBMs. The outer sheath of the cable is made of high-strength, wear-resistant, and anti-aging materials to protect the cable from external damage.

[0004] The laying of shield machine cables is relatively long, and the overall weight of shield machine cables is relatively large due to the weight of cable conductors, insulation layers, and outer sheaths. The laying of shield machine cables is difficult. The existing cable laying of shield machines generally involves storing the cables on a rear supporting trailer, pulling them manually, and placing them on the cable hooks hung on the tunnel wall. The laying efficiency is low and it consumes manpower and material resources.

[0005] The information disclosed in this background technology section is only used to deepen the understanding of the background technology of the present disclosure, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art known to those skilled in the art. Summary of the invention

[0006] In view of at least one of the above technical problems, the present disclosure provides a shield cable traction machine, aiming to solve the technical problem of low efficiency in manual cable pulling.

[0007] According to one aspect of the present disclosure, a shield cable traction machine is provided, including a base with side support frames on both sides, a bidirectional lead screw correspondingly arranged between the two side support frames and provided with two threads in different directions, a guide rod respectively arranged between the side support frames on both sides, two movable plates for moving along the guide rods and provided with a slot at the bottom, two lead screw nuts correspondingly threadedly connected to the two threads in different directions of the bidirectional lead screw and clamped in the corresponding slots of the movable plates, a pressure sensor embedded between any lead screw nut and the groove wall of the slot, a crawler conveyor mechanism fixed relatively to the movable plate and driven accordingly by a servo motor and a reducer, an encoder fixed relatively to the side support frames for measuring the output length of the cable, and a roller assembly arranged on both sides of the base along the cable traction direction for controlling the direction of the cable.

[0008] In some embodiments of the present disclosure, a pull rod for fixing the distance between the two side support frames is provided between the two side support frames.

[0009] In some embodiments of the present disclosure, the bidirectional lead screw is connected to a bearing between the side support frames.

[0010] In some embodiments of the present disclosure, a crank is provided at one end of the bidirectional lead screw.

[0011] In some embodiments of the present disclosure, a sliding member matching the outer edge profile of the guide rod is provided at the bottom of the movable plate corresponding to the guide rod, and the sliding member is relatively slidably sleeved outside the guide rod.

[0012] In some embodiments of the present disclosure, the pressure sensor is an annular pressure sensor, and is correspondingly sleeved outside the bidirectional lead screw.

[0013] In some embodiments of the present disclosure, the encoder includes a column, a cross bar that is relatively rotatably arranged on the end side of the column and has a tension spring between the column, and a pulley arranged on the end side of the cross bar for following the movement of the cable.

[0014] In some embodiments of the present disclosure, the roller assembly includes two horizontal rollers arranged in parallel up and down, and two vertical rollers arranged in parallel left and right.

[0015] In some embodiments of the present disclosure, the shield cable traction machine also includes a traction machine controller that is communicatively connected to the shield machine host.

[0016] One or more technical solutions provided in the embodiments of the present application have at least any of the following technical effects or advantages:

[0017] 1. The shield cable traction machine communicates with the shield machine host control system through the traction machine controller to obtain and receive control instructions from the shield host, thereby realizing control such as servo motor start and stop, speed, etc., reducing human participation and having a high degree of automation. The traction of the cable traction machine effectively solves the technical problems of low efficiency and high labor cost of existing manual traction.

[0018] 2. The outer edge of the bidirectional lead screw is provided with two sections of threads with different thread directions. Therefore, when the bidirectional lead screw is rotated, the lead screw nuts respectively connected to the two threads drive the two moving plates to approach the center or separate to both sides at the same time, thereby adjusting the distance between the crawler conveyor mechanisms, and then realizing adaptive adjustment of the cable clamping force.

[0019] 3. A pressure sensor is provided between the lead screw nut and the wall of the slot. When the lead screw nut drives the movable plate to move, the pressure sensor is squeezed, that is, the clamping force between the two crawler conveyor mechanisms is reflected to the degree of squeezing of the lead screw nut on the pressure sensor. The pressure value at this time is obtained by the pressure sensor as the clamping force between the two crawler conveyor mechanisms, so as to make corresponding adjustments to avoid cable slippage due to being too loose or affecting the strength and life of the traction mechanism components due to being too tight.

[0020] 4. The tension spring at the encoder uses its elastic force to keep the pulley close to the cable at all times, so that the actual output speed of the cable can be obtained by counting the encoder of the pulley rotation, and then the expected output speed of the cable can be calculated by the reduction ratio of the reducer. The difference between the two can be compared to determine whether there is slippage between the track and the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of a shield cable conveyor in one embodiment of the present application.

[0022] Figure 2 It is a cross-sectional view of a shield cable conveyor in one embodiment of the present application.

[0023] Figure 3 It is a schematic diagram of the structure of the lead screw nut in one embodiment of the present application.

[0024] In the above figures, 11 is a base, 12 is a side support frame, 13 is a pull rod, 2 is a crawler conveyor mechanism, 21 is a crawler, 3 is a bidirectional screw, 31 is a screw nut, 32 is a crank, 4 is a movable plate, 41 is a slot, 5 is a guide rod, 6 is a pressure sensor, 7 is an encoder, 71 is a pulley, 81 is a horizontal roller, and 82 is a vertical roller. DETAILED DESCRIPTION

[0025] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "vertical", "horizontal", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on this application. The "connection" and "coupling" involved in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0026] In order to better understand the technical solution of the present application, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] This example discloses a shield cable traction machine, see Figure 1 , which includes a base 11. In this example, the base 11 is a rectangular frame structure. Side support frames 12 are fixedly provided at the two long sides of the base. The side support frames 12 are respectively arranged perpendicular to the base 11. In this example, the side support frames 12 are door-shaped frames. Considering that the side support frames 12 will be subjected to external forces when the shield cable traction machine is actually working, which affects its structural strength, for this reason, in this embodiment, a tie rod 13 is provided between the side support frames 12. The tie rod 13 limits the spacing between the side support frames 12 to ensure the overall force strength of the shield cable traction machine when it is working.

[0028] To achieve cable traction, see Figure 1 The shield cable traction machine also includes a crawler conveyor mechanism 2. In this example, the crawler conveyor mechanism 2 includes two symmetrically arranged crawlers 21. The two crawlers 21 are arranged on both sides of the shield cable traction machine. The cable output is driven by the friction between the crawlers and the cable body when the crawlers rotate. However, considering that the clamping force between the crawlers will affect the cable transportation effect, for example, when the clamping force is too small, the cable and the crawler slip, the friction between the two is small or non-existent, and it is difficult or impossible to pull the cable output. When the clamping force is too large, the force strength of the traction machine structure will be additionally increased and the cable cable body will be improperly squeezed. The cable traction and transportation operation can be effectively and accurately completed when and only when the spacing between the crawlers matches the cable diameter. For this reason, in this embodiment, refer to Figure 1-Figure 2 A bidirectional lead screw 3 for adjusting the distance between the two crawlers in the crawler conveyor mechanism 2 is passed through the support frames 12 on both sides.

[0029] Specifically, in this embodiment, the outer edge of the bidirectional screw 3 is provided with two sections of threads with different spiral directions, and the two sections of threads are provided on both sides of the bidirectional screw 3 and have equal thread lengths; the bidirectional screw 3 penetrates the side support frame 12, thereby realizing the rotation of the bidirectional screw 3 relative to the side support frame 12. In order to adjust the spacing between the crawlers through the bidirectional four-screw 3, in this example, see Figure 2 The crawler conveyor mechanism 21 is arranged at the moving plate 4, and a slot 41 is arranged at the bottom of the moving plate, and a lead screw nut 31 is embedded in the slot 41, see Figure 3 The internal thread of the screw nut 31 matches the external thread in the corresponding direction of the bidirectional screw 3, so that when the bidirectional screw 3 rotates, the threaded connection relationship between the screw nut 31 and the bidirectional screw 3 enables the screw nut 31 to move along the bidirectional screw 3. In this embodiment, the screw nuts 31 are respectively threadedly connected to the threads in two different directions of the bidirectional screw 3, so that when the bidirectional screw 3 rotates, the two screw nuts 31 simultaneously approach or move away from the center of the bidirectional screw 3, and the movable plate 4 is clamped with the screw nut 31 through the clamping groove 41, so when the screw nut 31 moves with the bidirectional screw 3, the movable plate 4 fixed with the crawler conveyor mechanism 2 also moves accordingly, thereby realizing the adjustment of the distance between the two crawlers 21.

[0030] In addition, in this embodiment, see Figure 1 In order to facilitate the adjustment and rotation of the bidirectional screw 3, a crank 32 is fixedly provided at one end of the bidirectional screw 3, and the clamping force of the crawler conveyor mechanism 2 is adjusted by rotating the crank 32.

[0031] In order to ensure the stability of the movement of the moving plate 4 as the bidirectional lead screw 3 rotates, in this embodiment, see Figure 1 , a guide rod 5 is passed through the side support frames 12. In this example, there are two guide rods 5, which are respectively passed through the top ends of the two sides of the side support frames 12; a sliding member is fixedly provided at the bottom of the movable plate 4 corresponding to the position of the guide rod 5. In this example, the sliding member is a sleeve, wherein the inner edge contour of the sleeve matches the outer edge contour of the guide rod 5, so that the sleeve can be slidably sleeved outside the guide rod 5, thereby realizing the sliding of the movable plate 4 along the guide rod 5, so that when the movable plate 4 is driven by the bidirectional screw 3, the guide rod 5 provides the movable plate 4 with a supporting force, thereby avoiding the occurrence of problems such as the movable plate 4 moving out of position.

[0032] See also Figure 1 In this example, the crawler conveyor mechanism 2 and the movable plate 4 are relatively fixed, and the clamping force between the crawlers is adjusted by moving the movable plate 4 along the bidirectional lead screw 3. However, the clamping force is related to the working reliability of the cable traction machine. In order to ensure that the crawler clamping force of the crawler conveyor mechanism is within an appropriate range, in this embodiment, see Figure 2, a pressure sensor 6 is clamped in the bottom card slot 41 of one of the movable plates 4. Specifically, in this example, the pressure sensor 6 is an annular pressure sensor and is sleeved outside the bidirectional lead screw 3. One end face of the pressure sensor 6 is tightly fitted with the end face of the lead screw nut 31, and the other end face is tightly fitted with the inner groove wall of the card slot 41. As a result, the pressure sensor 6 can be tightly fitted between the corresponding card slot 41 and the lead screw nut 31. When the bidirectional lead screw 3 is rotated to make the crawlers on both sides move toward the center at the same time to achieve the cable clamping process, the lead screw nut 31 transmits the driving force to the card slot of the movable plate 4 through the pressure sensor 6 to achieve the purpose of moving the movable plate 4. The thrust can reflect the clamping force between the crawlers. When the crawlers gradually clamp the cable body, the pressure of the lead screw nut 31 on the pressure sensor 6 gradually increases. Therefore, the output value of the pressure sensor 6 is used to judge whether the cable is over-clamped. In this embodiment, a maximum limit of the clamping force is preset. When the value output by the pressure sensor 6 exceeds the limit, it means that the clamping is too tight, and a corresponding alarm is issued to facilitate adjustment.

[0033] In this example, the crawler conveyor mechanism 2 also includes a servo motor and a reducer for driving the crawler to rotate. The servo motor is connected to the crawler power shaft through the reducer, thereby realizing high-torque power transmission. In order to match the construction speed of the shield machine and considering the heavy cable of the shield machine, a reducer with a large reduction ratio is selected in this example, so as to obtain stronger power while reducing the traction speed; in addition, the servo motor has a constant torque output, so that the motor can maintain a large torque output at low speed.

[0034] In order to achieve accurate measurement of the cable traction output length, in this embodiment, an encoder 7 is fixedly arranged on one end side of the side support frame 12, and the encoder 7 includes a column fixedly arranged relatively to the side support frame 12, and a horizontal cross bar is rotatably connected at the top end of the column, and a pulley 71 is provided at the end of the cross bar for fitting with the cable and rotating with the cable output; thus, the height and spacing are adjusted by the column and the cross bar, so that the pulley 71 can be in the same horizontal plane as the cable, so as to fit with the cable; wherein, considering that the cable is not output along a straight line when output, in order to avoid the problem that the pulley 71 cannot follow the movement due to the deviation of part of the cable, which affects the measurement accuracy, in this embodiment, a tension spring is provided between the column and the cross bar, thereby the cross bar is pulled toward the direction of the cable by the elastic force of the tension spring, so that the pulley 71 at the end of the cross bar is tightly fitted with the cable under the elastic force of the tension spring, and even if the cable deviates, the pulley 71 will also be driven by the tension spring to perform adaptive position adjustment, so as to always maintain its tight fit with the cable. Furthermore, since the circumference of the outer edge of the pulley 71 is constant, the actual output length of the cable can be measured by counting the number of rotations of the pulley 71.

[0035] Considering that the adjustment range of the crossbar pulled by the tension spring is limited, in order to prevent the cable from deviating to a degree greater than the adjustable range of the tension spring, in this embodiment, roller assemblies for controlling the cable conveying direction are respectively arranged on both sides of the base 11 along the cable pulling direction, see Figure 1 In this example, the roller assembly includes two brackets arranged in parallel, two transverse rollers 81 inserted between the brackets and arranged in parallel up and down, and vertical rollers 82 respectively arranged at the two brackets. The two vertical rollers 82 are arranged in parallel and are arranged within the range of the two transverse rollers 81, so that the cable can be clamped in four directions of up, down, left and right by each roller. In addition, in this embodiment, a plurality of through holes are opened in the vertical direction at the bracket for inserting the transverse rollers 81, so that the spacing between the transverse rollers 81 can be adjusted by inserting the transverse rollers 81 at different height positions, so as to better achieve the clamping effect and avoid excessive deviation of the cable.

[0036] In addition, the shield cable traction machine also includes a traction machine controller that is connected to the shield machine main machine in a corresponding communication manner. The traction machine controller can obtain the output of the pressure sensor 6 and the encoder 7, and control the start and stop and speed of the servo motor. In order to effectively determine whether the crawler and the cable body are slipping, the expected output speed of the cable is calculated according to the speed of the servo motor controlled by the traction machine controller, the reduction ratio of the reducer and the diameter of the crawler wheel driving the crawler; and the actual output speed of the cable is calculated according to the output of the encoder 7. By determining whether there is a difference between the expected speed and the actual speed, it is determined whether there is a slip problem between the crawler and the cable, and the clamping force is adjusted accordingly by adjusting the bidirectional lead screw 3; in this example, an allowable range of the difference between the expected speed and the actual speed is preset. When the difference between the two exceeds the range, an alarm is issued to adjust the clamping force of the crawler in time to avoid slipping.

[0037] In addition, in order to protect the safe use of the equipment and avoid damage to the cable caused by excessive output tension of the cable traction machine, an upper limit value of tension is set. The output tension is calculated based on the output torque of the servo motor, the reduction ratio of the reducer, and the sprocket diameter corresponding to the track, and the output tension is compared with the upper limit value of tension. When it exceeds the limit, an alarm is triggered to shut down the machine. In some other embodiments, a tension over-limit time is set. When the output tension is greater than the set tension upper limit value and exceeds the tension over-limit time, an alarm is triggered to shut down the machine.

[0038] Although some preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0039] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the inventive concept. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A shield cable traction machine, characterized in that: The invention comprises a base with side support frames on both sides, a bidirectional lead screw which is correspondingly arranged between the two side support frames and is provided with two threads in different directions, a guide rod which is respectively arranged between the side support frames on both sides, two movable plates which are used to move along the guide rod and are provided with a slot at the bottom, two lead screw nuts which are threadedly connected with the two threads in different directions of the bidirectional lead screw and are clamped in the corresponding slots of the movable plates, a pressure sensor which is embedded between any lead screw nut and the groove wall of the slot, a crawler conveying mechanism which is relatively fixed to the movable plate and driven by a servo motor and a reducer, an encoder which is relatively fixed to the side support frames and is used to measure the output length of the cable, and a roller assembly which is arranged on both sides of the base along the cable traction direction and is used to control the direction of the cable.

2. The shield cable traction machine according to claim 1, characterized in that: A pull rod for fixing the distance between the two side support frames is provided between the two side support frames.

3. The shield cable traction machine according to claim 1, characterized in that: The bidirectional lead screw is connected with a bearing between the side support frames.

4. The shield cable traction machine according to claim 1, characterized in that: A crank is provided at one end of the bidirectional lead screw.

5. The shield cable traction machine according to claim 1, characterized in that: The bottom of the movable plate corresponding to the guide rod is provided with a sliding piece matching the outer edge profile of the guide rod, and the sliding piece is relatively slidably sleeved outside the guide rod.

6. The shield cable traction machine according to claim 1, characterized in that: The pressure sensor is an annular pressure sensor and is correspondingly sleeved outside the bidirectional lead screw.

7. The shield cable traction machine according to claim 1, characterized in that: The encoder comprises a column, a cross bar which is relatively rotatably arranged at the end side of the column and has a tension spring between the column, and a pulley which is arranged at the end side of the cross bar and moves with the cable.

8. The shield cable traction machine according to claim 1, characterized in that: The roller assembly comprises two horizontal rollers arranged in parallel up and down, and two vertical rollers arranged in parallel left and right.

9. The shield cable traction machine according to claim 1, characterized in that: It also includes a traction machine controller that is communicatively connected to the shield machine host.

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