A reel system and hydraulic system for a downhole service vehicle
By designing anti-over-retraction and anti-over-discharge components on underground engineering vehicles, and utilizing the cooperation of self-resetting switches, elastic reset plates, and conductive rings, the problem of over-retraction or over-discharge of cables is solved, realizing automatic stopping of cable retraction and discharging, and improving operational safety and efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUNAN SFORDMAIDEN INTELLIGENT EQUIPMENT CO LTD
- Filing Date
- 2025-10-09
- Publication Date
- 2026-08-04
AI Technical Summary
The cables of underground engineering vehicles are prone to being over-retracted or over-released during the winding and unwinding process, which can lead to cable damage and poor operating visibility.
An over-recruitment and over-discharge prevention component was designed. Through the cooperation of a self-resetting switch and an elastic reset plate with a conductive ring, respectively, a stop-recruitment and stop-discharge signal is generated to prevent the cable from being over-recruited or over-discharged.
It enables automatic cable retraction and retraction, avoiding cable damage and limiting the operator's field of vision, thus improving operational safety and efficiency.
Smart Images
Figure CN224590451U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of engineering machinery, and in particular to a drum winding and unwinding device and hydraulic system for underground engineering vehicles. Background Technology
[0002] To enable downhole engineering vehicles (such as downhole cooling vehicles) to have a wider operating range, the vehicles are typically equipped with cable reels, such as... Figure 1 As shown, to facilitate cable unloading while driving, the cable exit holes are located at the rear of the vehicle, while the cable reel operating mechanism is located near the front cab (usually inside the cab for easy cable unloading while driving). This layout results in poor visibility for the operator, and single-person operation can easily lead to over-winding or over-unwinding of the cable. Over-winding requires significant manpower for cable threading, while over-unwinding causes the cable to bend in the opposite direction along the reel's exit hole. This can easily lead to insufficient cable diameter reduction and breakage, and also damage the cable reel's exit port. Therefore, how to solve the problems of over-winding and over-unwinding of cables is an urgent issue that needs to be addressed in this technical field. Utility Model Content
[0003] This application provides a reel winding and unwinding device and hydraulic system for underground engineering vehicles, which can generate stop winding signals and stop unwinding signals respectively to prevent over-winding and over-unwinding of cables.
[0004] In a first aspect, this application provides a reel winding and unwinding device for downhole engineering vehicles, including a reel, an over-rewinding prevention component, and an over-discharge prevention component; the fixed end of the cable is connected to the reel; the over-rewinding prevention component includes a self-resetting switch and a damping block; the engineering vehicle is provided with a cable outlet hole, through which the cable passes, and the self-resetting switch is disposed at the opening of the cable outlet hole; the damping block is disposed on the outer circumference of the cable, the outer diameter of the damping block is larger than the inner diameter of the cable outlet hole, and the damping block is used to drive the self-resetting switch; the over-discharge prevention component includes an elastic reset plate, a conductive ring, metal contacts, and a signal line; the elastic reset plate is disposed on the reel; in the radial direction of the reel, the elastic reset plate is located on one side of the fixed end of the cable, the conductive ring is coaxially disposed on the central axis of the reel, and the conductive ring includes two metal rings distributed axially along the central axis, the two metal rings being electrically connected to the signal line; the metal contacts are disposed on the elastic reset plate for contacting and engaging with the metal rings one by one.
[0005] Preferably, a central shaft is coaxially arranged inside the drum, and the conductive ring is coaxially fixed on the outer circumference of the central shaft.
[0006] Preferably, the self-resetting switch and the damping block are arranged axially corresponding to each other in the outlet hole.
[0007] Preferably, the damping block is made of a flexible material.
[0008] Preferably, the drum is provided with an inwardly recessed portion, the recessed portion including a side wall and an end wall, the two side walls are spaced apart along the axial direction of the drum, the end wall is connected between the two side walls, and the fixed end of the cable is connected to the end wall; the upper surface of the elastic reset plate is configured as the inner bottom wall of the recessed portion.
[0009] Preferably, the elastic reset plate is hinged to the side wall via a pin, and a torsion spring is provided on the pin, with the two ends of the torsion spring connected to the elastic reset plate and the side wall respectively.
[0010] Preferably, the elastic reset plate includes a straight section and an arc-shaped section connected to each other; the straight section is connected to the end wall, and the outer arc surface of the arc-shaped section contacts the outer circumference of the cable.
[0011] Preferably, it also includes a drive unit, which is connected to the drum and is used to drive the drum to rotate.
[0012] Secondly, this application provides a hydraulic system for a downhole engineering vehicle, including a control unit, an oil pump, a two-position four-way solenoid valve, a speed control valve, a directional valve, and a drum winding and unwinding device; the oil pump, the two-position four-way solenoid valve, the speed control valve, and the directional valve are connected in sequence; the control unit is electrically connected to the two-position four-way solenoid valve, a self-resetting switch, a signal line, and a drive component for driving the drum to rotate.
[0013] Preferably, the reversing valve is configured as an O-type three-position four-way reversing valve.
[0014] The reel winding and unwinding device and hydraulic system of this application have at least the following beneficial effects:
[0015] The winding and unwinding device of this application is equipped with an over-winding prevention component and an over-unwinding prevention component. During winding, the cable is retracted from the outlet hole onto the drum. When the cable is wound to a certain length, the damping block on the cable contacts the self-reset switch near the outlet hole along the cable's winding path and presses the self-reset switch, thereby causing the self-reset switch to generate a stop winding signal. During unwinding, in the initial state, the elastic reset plate is pressed inward because the fixed end of the cable is wound onto the drum. At this time, the metal contact on the back side of the elastic reset plate remains in contact with the metal ring on the conductive ring. As the cable on the drum... As the cable is gradually released until all the cable on the outer circumference of the drum is released, the fixed end of the cable is taut. At this point, the elastic reset plate is no longer constrained by the cable and performs an elastic reset. The metal contacts follow the reset action of the elastic reset plate and disengage from the metal ring. The closed loop formed by the signal line, the metal ring, and the metal contacts is broken, thereby generating a stop cable release signal. This application can generate stop cable reeling and stop cable release signals through the over-reeling component and the over-release component, respectively. These signals can be used to provide audible and visual alarms to the operator or as control signals to control the hydraulic system to brake the drum. Attached Figure Description
[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:
[0017] Figure 1 This is a schematic diagram of the arrangement of the drum in the prior art;
[0018] Figure 2 This is a schematic diagram of the roll take-up and unwinding device of this application;
[0019] Figure 3 yes Figure 2 Enlarged view of point A in the middle;
[0020] Figure 4 This is a schematic diagram of the structure of the reel and the over-discharge protection assembly in this application;
[0021] Figure 5 yes Figure 4 Top view;
[0022] Figure 6 yes Figure 5 A partial schematic diagram of AA;
[0023] Figure 7 yes Figure 5 A partial schematic diagram of BB in the middle;
[0024] Figure 8 This is a schematic diagram of the working principle of the over-discharge protection component;
[0025] Figure 9 This is a schematic diagram of the hydraulic system of the drum in this application;
[0026] The annotations in the attached figures are explained as follows:
[0027] 100. Drum; 110. Central shaft; 120. Recess; 121. Side wall; 122. End wall; 130. Drive component;
[0028] 200. Cable; 210. Fixed end of cable; 220. Free end of cable;
[0029] 300. Overcurrent protection component; 310. Self-resetting switch; 320. Damping stop;
[0030] 400. Over-discharge protection assembly; 410. Flexible reset plate; 411. Straight section; 412. Arc-shaped section; 420. Conductive ring; 420a. Metal ring; 430. Metal contact;
[0031] 500. Drum hydraulic system; 510. Control unit; 520. Oil pump; 530. Two-position four-way solenoid valve; 540. Speed control valve; 550. Directional control valve; 560. Relief valve;
[0032] 600, Engineering vehicle; 600a, Cable outlet. Detailed Implementation
[0033] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.
[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.
[0035] like Figure 2 As shown in the figure, this embodiment discloses a drum winding and unwinding device for underground engineering vehicles. The drum winding and unwinding device includes a drum 100, an over-winding prevention component 300, and an over-unwinding prevention component 400, as detailed below:
[0036] like Figure 2 As shown, the drum 100 is located at the front end of the engineering vehicle 600. A central shaft 110 is coaxially mounted on the center of the drum 100. A drive component 130 (e.g., a hydraulic motor, electric motor, etc.) is mounted on the engineering vehicle 600. The output end of the drive component 130 is connected to the drum 100. Preferably, the drive component 130 is connected to the drum 100 via a gear mechanism. When the drive component 130 is working, it can drive the drum 100 to rotate, thereby realizing cable winding and unwinding. The drum 100 and the central shaft 110 are rotatably connected together. When the drum 100 rotates, the central shaft does not rotate; the two rotate relative to each other.
[0037] like Figure 2 As shown, the rear end of the engineering vehicle 600 is provided with a cable outlet 600a. The fixed end 210 of the cable is connected to the drum 100, and the free end 220 of the cable extends from the front end of the engineering vehicle 600 to the rear end and passes through the cable outlet 600a.
[0038] like Figure 3 As shown, the over-reeling prevention component 300 includes a self-reset switch 310 and a damping block 320. The self-reset switch 310 is disposed on the end face of the outlet hole 600a and is located near the outlet hole 600a. The damping block 320 is fixedly connected to the outer circumference of the cable 200. Preferably, the damping block 320 is connected near the free end 220 of the cable, and the outer diameter of the damping block 320 is larger than the outer diameter of the outlet hole 600a. When the cable 200 is retracted onto the drum 100, the damping block 320 can gradually approach the outlet hole 600a and abut against the self-reset switch 310 near the outlet hole 600a, thereby pushing the self-reset switch 310 to generate a stop reeling signal.
[0039] like Figure 3 As shown, in some preferred embodiments, the self-resetting switch 310 and the damping block 320 are axially corresponding to each other in the outlet hole 600a. Therefore, when the cable is retracted, the damping block 320 gradually approaches the outlet hole 600a along with the cable 200 and can abut against the self-resetting switch 310 located near the opening of the outlet hole 600a.
[0040] like Figure 3 As shown, in some preferred embodiments, the damping block 320 is made of a flexible material, such as rubber or sponge. The flexible material of the damping block 320 can prevent collisions caused by rigid contact with the self-resetting switch 310.
[0041] like Figures 4 to 7As shown, the over-discharge protection assembly 400 includes an elastic reset plate 410, a conductive ring 420, metal contacts 430, and signal lines (not shown). The elastic reset plate 410 is disposed on the reel 100. The conductive ring 420 is coaxially connected to the central shaft 110. The conductive ring 420 includes multiple metal rings 420a, which are coaxially connected to the central shaft 110. The multiple metal rings 420a are spaced apart along the axial direction of the central shaft 110. In this embodiment, two metal rings 420a are used as an example. Two metal contacts 430, corresponding one-to-one with the two metal rings 420a, are disposed on the elastic reset plate 410. The two metal contacts 430 can be electrically connected to each other through a metal connecting part, or the elastic reset plate 410 itself can be made of metal to allow the two metal contacts 430 to be electrically connected. There are two signal lines, which are electrically connected one-to-one with the metal rings 420a. Specifically... One end of the signal line is electrically connected to the metal ring 420a, and the other end of the signal line can be connected to the control unit 510. The control unit 510 can give a signal to the signal line. If the signal returns to the control unit 510 after passing through the first signal line, the first metal ring 420a, the first metal contact 430, the second metal contact 430, the second metal ring 420a, and the second signal line, it is determined that the signal line forms a closed loop. At this time, it is determined that the cable 200 has not been unwound to the end and can continue to be unwound. Simply put, when both metal contacts 430 are in contact with both metal rings 420a, the signal line is in a closed state, that is, the metal contacts 430, the metal rings 420a, and the signal line can form a closed loop. When the metal contacts 430 are no longer in contact with the metal rings 420a, the loop is broken, the signal line is in an open state, and a stop unwinding signal can be generated.
[0042] like Figure 6 As shown, the fixed end 210 of the cable is connected to the drum 100, and in the radial direction of the drum 100, the fixed end 210 of the cable is located on one side of the elastic reset plate 410, specifically on the side close to the central axis 110.
[0043] like Figure 4 and Figure 5 As shown, in some preferred embodiments, the reel 100 is provided with a recessed portion 120 recessed towards the central axis 110. The recessed portion 120 includes a side wall 121 and an end wall 122. The two side walls 121 are spaced apart at the axis of the central axis 110. The two ends of the end wall 122 are respectively connected to the two side walls 121. The fixed end 210 of the cable is connected to the end wall 122 of the recessed portion 120.
[0044] like Figure 6As shown, the recess 120 also has an inner bottom wall, and the upper surface of the elastic reset plate 410 (a surface away from the central axis 110) is configured as the inner bottom wall of the recess 120. The elastic reset plate 410 is made of an elastic material such as spring steel, and one end of the elastic reset plate 410 is connected to the lower end of the end wall 122.
[0045] In some other embodiments, the elastic reset plate 410 is not connected to the end wall 122, but is hinged to the side wall 121. Specifically, the elastic reset plate 410 is hinged to the side wall 121 via a pin (not shown), the axis of which is parallel to the central axis 110. The elastic reset plate 410 can rotate around the pin. A torsion spring (not shown) is provided on the pin, and the two ends of the torsion spring are respectively connected to the elastic reset plate 410 and the side wall 121. The metal contact 430 is located on the back side of the elastic reset plate 410. When the elastic reset plate 410 is not under pressure from the cable 200, the torsion spring causes the metal contact 430 on the elastic reset plate 410 to disengage from the metal ring 420a, the signal line is disconnected, and a stop cable feeding signal is generated. When the fixed end 210 of the cable is wound and tightened on the drum 100, the outer circumferential surface of the cable 200 contacts the elastic reset plate 410 and applies pressure to the elastic reset plate 410, overcoming the elastic force of the torsion spring and causing the metal contact 430 to contact the metal ring 420a.
[0046] like Figure 6 As shown, in this preferred embodiment, the elastic reset plate 410 includes a straight section 411 and an arc-shaped section 412 connected to each other; one end of the straight section 411 is connected to the lower end of the end wall 122, and the other end of the straight section 411 is connected to the arc-shaped section 412. The outer arc surface of the arc-shaped section 412 is used to contact the outer circumference of the cable 200. Specifically, when the cable 200 is wound and tightened on the drum 100, the outer circumference of the cable 200 is pressed against the outer arc surface of the arc-shaped section 412 and... The metal contact 430 on the back side of the straight section 411 is in contact with the metal ring 420a. When the cable is unwound to the last turn, the fixed end 210 of the cable is unwound and taut. At this time, the fixed end 210 of the cable is taut and disengages from the outer arc surface of the arc section 412. Under the action of the torsion spring or the elastic reset plate 410 itself, the elastic reset plate 410 is reset, and the metal contact 430 on the back side disengages from the metal ring 420a, thereby generating a stop cable unwinding signal.
[0047] The elastic reset plate 410 is designed with a straight section 411 and an arc section 412. The arc section 412 is designed to avoid scratching or obstructing the winding and unwinding of the cable 200. At the same time, it facilitates the cable 200 to apply pressure to the elastic reset plate 410 during winding or to disengage from the elastic reset plate 410 when unwinding to the last turn.
[0048] like Figure 8As shown, the principle for preventing over-discharge is as follows: In the initial state, the cable 200 is wound tightly onto the drum 100, and the fixed end 210 of the cable presses against the elastic reset plate 410, as... Figure 8 As shown in (A), arrow F indicates the direction of force applied by cable 200 to elastic reset plate 410. The metal contact 430 on the back side of elastic reset plate 410 remains in contact with metal ring 420a. During the unwinding process, metal contact 430 and metal ring 420a maintain relative sliding contact, and the closed loop formed by the signal line remains closed. As the drum 100 gradually unwinds until the last turn of cable 200 on the drum 100 is unwound, the fixed end 210 of the cable connected to the drum 100 is taut. Figure 8 As shown in (B), at this time, the length direction of the cable 200 is tangential (tangential to the drum 100), the fixed end 210 of the cable is released from the elastic reset plate 410, and the metal contact 430 on the back side of the elastic reset plate 410 is disengaged from the metal ring 420a under the action of the deformation reset force. At this time, the signal line is in the disconnected state. By the connection and disconnection of the signal line, it can be determined whether there is a force of the cable 200 on the elastic reset plate 410, thereby determining whether there is still a cable 200 on the drum 100. If not, a corresponding stop cable feeding signal is generated.
[0049] like Figure 9 As shown, this embodiment also discloses a drum hydraulic system for downhole engineering vehicles. The drum hydraulic system includes a control unit 510, an oil pump 520, a two-position four-way solenoid valve 530, a speed control valve 540, a reversing valve 550, and a drum winding and unwinding device, as detailed below:
[0050] The outlet of the oil pump 520 is connected to the first oil port of the two-position four-way solenoid valve 530, the second oil port of the two-position four-way solenoid valve 530 is connected to the oil tank, the third oil port of the two-position four-way solenoid valve 530 is connected to the first oil port of the speed control valve 540, and the fourth oil port of the two-position four-way solenoid valve 530 is connected to the oil tank.
[0051] The second oil port of the speed control valve 540 is connected to the P port of the directional valve 550, and the T port of the directional valve 550 is connected to the oil tank. The A1 port and B1 port of the directional valve 550 are respectively connected to the drive unit 130. In this embodiment, the drive unit 130 is preferably a hydraulic motor, and the A1 port and B1 port are respectively connected to the hydraulic motor.
[0052] In some preferred embodiments, the directional valve 550 is configured as a three-position four-way directional valve 550 with O-type function, which can lock the drive unit 130 (hydraulic motor) when the drum 100 is not working, thereby ensuring that the drum 100 does not rotate arbitrarily.
[0053] The control unit 510 is electrically connected to the two-position four-way solenoid valve 530, the self-resetting switch 310, the signal line, and the drive unit 130 (hydraulic motor), and controls the coordinated operation of each part through the control unit 510.
[0054] The working principle of the hydraulic reel system in this embodiment to prevent over-winding and over-unwinding of cable 200 is as follows:
[0055] In this embodiment, the engineering vehicle 600 is hydraulically driven, and the drum 100 is also driven by the drive component 130 (hydraulic motor).
[0056] The hydraulic oil from the outlet of the oil pump 520 enters the drive unit 130 through the two-position four-way solenoid valve 530, the speed control valve 540, and the reversing valve 550. The drive unit 130 drives the drum 100 to rotate. The relief valve 560 mainly plays a safety protection role to prevent system overload. When the two-position four-way solenoid valve 530 is not energized, the hydraulic oil from the outlet of the oil pump 520 returns directly to the oil tank, and the oil pump 520 is unloaded.
[0057] When the drum 100 is rotating normally, the two-position four-way solenoid valve 530 is energized. The reversing valve 550 adopts an O-type function. When the drum 100 is not working, the oil port of the drive component 130 is locked, thereby ensuring that the drum 100 will not rotate arbitrarily.
[0058] Prevent excessive cable retraction, such as Figure 2 As shown: When the drum 100 is winding up the cable and is about to finish winding up the cable 200, the damping block 320 pushes down the self-resetting switch 310 at the rear of the engineering vehicle 600. After receiving the switch signal (stop winding signal), the control unit 510 determines that the winding is in place. The control unit 510 controls the two-position four-way solenoid valve 530 to de-energize, the oil pump 520 to unload, the drive component 130 to stop moving, and the drum 100 to stop winding up the cable.
[0059] Prevent excessive cable discharge, such as Figure 8As shown: During the unwinding process, the cable 200 is initially wound and tightened on the drum 100, with the fixed end 210 of the cable pressing against the elastic reset plate 410. This keeps the metal contact 430 on the back of the elastic reset plate 410 in contact with the metal ring 420a. During the unwinding process, the metal contact 430 and the metal ring 420a maintain relative sliding contact, and the closed loop formed by the signal line remains closed. As the drum 100 gradually unwinds until the last turn of cable 200 on the drum 100 is unwound, the fixed end 210 of the cable connected to the drum 100 is taut. At this point, the length of the cable 200... The direction is tangential (tangential to the drum 100). The fixed end 210 of the cable loosens the elastic reset plate 410. The metal contact 430 on the back side of the elastic reset plate 410 disengages from the metal ring 420a under the action of deformation reset force. At this time, the signal line is in the disconnected state. The connection and disconnection of the signal line can determine whether there is a force of cable 200 on the elastic reset plate 410, thereby determining whether there is still cable 200 on the drum 100. If not, a corresponding stop wire feeding signal is generated. The control unit 510 controls the drive 130 to stop moving according to the stop wire feeding signal, and the drum 100 stops wire feeding.
[0060] After the cable unwinding stops, if it is necessary to rewind the cable 200, the drive unit 130 will operate to rewind the cable 200 back onto the drum 100. Under the tension of the cable 200 winding, the elastic reset plate 410 will be pressed down, and the metal contact 430 on the back of the elastic reset plate 410 will contact the metal ring 420a again. The signal line will be in the ON state at this time. When the drum 100 is winding the cable and is about to finish winding the cable 200, the damping block 320 will push down the self-reset switch 310 at the rear of the engineering vehicle 600, generating a stop winding signal.
[0061] This embodiment, through a simple structural form and the control unit 510 inherent in the engineering vehicle 600, can prevent the cable 200 from being over-retracted, thus avoiding the need to expend considerable effort to re-thread the cable 200 when it is over-retracted to the bottom of the vehicle. By adding an anti-over-release component 400 at the cable 200 reel 100 outlet, the cable reel 100 can be automatically stopped from releasing the cable, thus preventing the cable 200 from being damaged in the reverse direction due to over-release of the reel 100.
[0062] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.
Claims
1. A reel winding and unwinding device for underground engineering vehicles, characterized in that, include: A reel (100) is attached to a cable with a fixed end (210). The overload protection component (300) includes a self-reset switch (310) and a damping block (320); the engineering vehicle (600) is provided with a cable outlet (600a), through which the cable (200) passes; the self-reset switch (310) is located at the opening of the cable outlet (600a); the damping block (320) is located on the outer circumference of the cable (200), and the outer diameter of the damping block (320) is larger than the inner diameter of the cable outlet (600a); the damping block (320) is used to drive the self-reset switch (310); The over-discharge protection assembly (400) includes an elastic reset plate (410), a conductive ring (420), metal contacts (430), and a signal line. The elastic reset plate (410) is disposed on a reel (100). In the radial direction of the reel (100), the elastic reset plate (410) is located on one side of the fixed end (210) of the cable. The conductive ring (420) is coaxially disposed on the central axis (110) of the reel. The conductive ring (420) includes two metal rings (420a) distributed axially along the central axis (110). The two metal rings (420a) are electrically connected to the signal line. The metal contacts (430) are disposed on the elastic reset plate (410) and are used to contact and cooperate with the metal rings (420a) one by one.
2. The winding and unwinding device according to claim 1, characterized in that, The drum (100) has a central shaft (110) coaxially arranged inside, and the conductive ring (420) is coaxially fixed on the outer circumference of the central shaft (110).
3. The winding and unwinding device according to claim 1, characterized in that, The self-reset switch (310) and the damping block (320) are axially corresponding to each other in the outlet hole (600a).
4. The winding and unwinding device according to claim 3, characterized in that, The damping stop (320) is made of flexible material.
5. The winding and unwinding device according to any one of claims 1 to 4, characterized in that, The drum (100) is provided with an inwardly recessed portion (120), the recessed portion (120) includes a side wall (121) and an end wall (122), the two side walls (121) are spaced apart along the axial direction of the drum (100), the end wall (122) is connected between the two side walls (121), and the fixed end (210) of the cable is connected to the end wall (122); the upper surface of the elastic reset plate (410) is configured as the inner bottom wall of the recessed portion (120).
6. The winding and unwinding device according to claim 5, characterized in that, The elastic reset plate (410) is hinged to the side wall (121) by a pin. A torsion spring is provided on the pin, and the two ends of the torsion spring are connected to the elastic reset plate (410) and the side wall (121) respectively.
7. The winding and unwinding device according to claim 5, characterized in that, The elastic reset plate (410) includes a straight plate segment (411) and an arc segment (412) connected to each other; the straight plate segment (411) is connected to the end wall (122), and the outer arc surface of the arc segment (412) is in contact with the outer circumference of the cable (200).
8. The winding and unwinding device according to claim 1, characterized in that, It also includes a drive unit (130), which is connected to the drum (100) and is used to drive the drum (100) to rotate.
9. A reel hydraulic system for a downhole service vehicle, characterized by, It includes a control unit (510), an oil pump (520), a two-position four-way solenoid valve (530), a speed control valve (540), a reversing valve (550), and a drum take-up and unwinding device as described in any one of claims 1 to 8; The oil pump (520), the two-position four-way solenoid valve (530), the speed control valve (540) and the reversing valve (550) are connected in sequence; the control unit (510) is electrically connected to the two-position four-way solenoid valve (530), the self-resetting switch (310), the signal line and the drive unit (130) for driving the drum (100) to rotate.
10. The reel hydraulic system of claim 9, wherein, The reversing valve (550) is configured as an O-type three-position four-way reversing valve.