Cableway four-pole limiting protection device
By designing a four-pole limit protection device in the cable flow measurement system, using technologies such as limit components and elastic switches, the safety hazards of remote operating systems in the case of network delay or network disconnection are solved, and the cable is realized The effective protection of the four-pole limit position improves the safety and stability of the system.
Patent Information
- Application Number
- CN202420162910.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-23
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-01-23
AI Technical Summary
The existing remote-operated cable flow measurement system has safety hazards in the event of network delay or disconnection, and insufficient protection of the four-pole limit of the cable can cause damage to the equipment.
Design a cable four-pole limit protection device, through the coordination of limit components, elastic switches and other components, triggers and control systems, to ensure that the winch stops running at four positions, namely, far, extremely high and extremely low. Prevent lead fish from hitting and equipment damage.
It effectively improves the safety of the cable flow measurement system, reduces safety hazards, prevents accidents, and ensures the stable operation of the equipment.
Smart Images
Figure CN222138497U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of cableway protection devices, and in particular relates to a cableway four-limit position protection device. Background Art
[0002] The hydrological flow measurement system is generally completed on the basis of a hydrological station, and the flow is measured by combining cableways, hydrological instruments and control systems. The existing hydrological flow measurement can also be equipped with a remote monitoring system, which observes the cableway and river conditions through cameras, and controls the cableway equipment through the network to perform remote operation flow measurement. This flow measurement method usually involves one staff member or no staff member.
[0003] However, this kind of remote operation of cableway flow measurement has uncertainties, and network delays or disconnections may occur. At this time, the operation of the on-site cableway will cause great safety hazards and damage to the equipment of the hydrological flow measurement system. The current remote operation system still has a lot of room for improvement in the four extreme positions of the on-site cableway, among which the four extreme positions are the extreme positions of the cableway lead fish carrier in the four running directions, namely, very close, very far, very high, and very low.
[0004] In view of this, it is necessary to design a cableway four-limit position protection device to improve the safety of remote-operated cableway flow measurement, reduce safety hazards, and avoid damage to the hydrological flow measurement system. Utility Model Content
[0005] The utility model provides a cableway four-limit position protection device to solve the technical problems mentioned in the background technology.
[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0007] A cableway four-limit position protection device is arranged on a cableway current measuring system; the cableway current measuring system comprises a first column, a second column, a winch, a wire system, a lead fish and a traveling frame; the first column and the second column are respectively arranged on the banks on both sides; the winch is arranged on the first column; the wire system is arranged on the first column and the second column; the wire system is connected with the winch and the lead fish; the traveling frame is movably arranged on the wire system and moves on the wire system; the lead fish is located below the traveling frame; the protection device comprises: a limit assembly, which comprises a first limit switch and a bracket; the bracket is arranged on a side of the top of the first column close to the traveling frame; the first limit switch is arranged on a side of the bracket close to the traveling frame; the first limit switch triggering part is in the same straight line as the traveling frame.
[0008] As a further improvement of the technical solution, the traveling frame also includes an L-shaped plate; the L-shaped plate is arranged on one side of the top of the traveling frame close to the first column; the L-shaped plate and the triggering part of the first limit switch are on the same straight line.
[0009] As a further improvement of the technical solution, the steel wire system includes a load-bearing steel wire, a circulating steel wire, a lifting steel wire and a cruise wheel for adjustment; an adjusting groove wheel is provided on the cruise wheel; both ends of the load-bearing steel wire are fixedly connected to the first column and the second column respectively; one end of the circulating steel wire is fixedly connected to the bottom of the traveling frame, and the other end thereof passes through the groove wheels on the top of the second column and the top of the first column, the adjusting groove wheel on the top of the cruise ship and the winch in sequence, and then passes through the groove wheel on the bottom of the traveling frame to be connected to the lead fish; one end of the lifting steel wire is fixedly connected to the bottom of the first column, and the other end thereof passes through the adjusting groove wheel on the bottom of the cruise ship and the groove wheel on the bottom of the first column in sequence, and is connected to the winch; the load-bearing steel wire is located above the circulating steel wire; the groove wheel on the top of the traveling frame is connected to the load-bearing steel wire.
[0010] As a further improvement of the technical solution, the limit assembly also includes a second limit switch and a thimble; the second limit switch is arranged on a surface of the bracket close to the traveling frame; the thimble is arranged on the circulating steel wire and moves with the circulating steel wire; the second limit switch is located below the first limit switch, and the triggering part of the second limit switch is in the same straight line as the thimble; the thimble is located above the groove wheel at the bottom of the traveling frame.
[0011] As a further improvement of the technical solution, the cruise ship includes the adjusting sheave and an H-shaped bracket; the adjusting sheave is rotatably provided on the four ends of the H-shaped bracket.
[0012] As a further improvement of the technical solution, the cruise ship also includes a top plate; one end of the top plate is fixedly connected to the bottom end of the H-shaped bracket, and the other end thereof faces the bottom end of the first column; the limit assembly also includes a limit bracket and a third limit switch; the bracket is arranged at the bottom end of the first column; the third limit switch is arranged on the top of the bracket; the trigger part of the third limit switch is located on the same straight line as the top plate.
[0013] As a further improvement of the technical solution, the limit assembly also includes a limit block; the limit block is arranged at one end of the circulating steel wire close to the lead fish; the limit block is located below the traveling frame.
[0014] As a further improvement of the technical solution, the limit assembly also includes a tension switch; the tension switch is arranged at the bottom end of the first column; and the end of the lifting wire away from the winch is connected to the tension switch.
[0015] As a further improvement of the technical solution, the tension switch includes a shell, a spring, a connecting rod and a fourth limit switch; one end of the shell is connected to the bottom end of the first column, and the other end is slidably connected to the connecting rod; one end of the connecting rod extends into the interior of the shell and faces the connection between the shell and the first column, and the other end is connected to the end of the lifting wire away from the winch; the spring is located inside the shell, one end of which is connected to the end of the connecting rod located inside the shell, and the other end is connected to the end of the shell close to the bottom of the first column; the fourth limit switch is arranged inside the shell, with its trigger end facing the spring and fixedly connected to the middle part of the spring.
[0016] Compared with the prior art, the beneficial effects of the utility model are as follows:
[0017] The utility model protects the four quadrants of the lead fish, namely, extremely near, extremely far, extremely high and extremely low, through a limit component. When the limit component is triggered, the winch can stop running and the winch stops rotating, thereby protecting the four limit positions of the cableway lead fish, preventing the winch from running continuously, avoiding the lead fish from colliding and causing damage, improving safety, reducing safety hazards, and preventing accidents. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0019] Figure 1 This is a schematic diagram of the structure of a cableway four-limit position protection device of the utility model;
[0020] Figure 2 for Figure 1 The enlarged schematic diagram of point A in the middle;
[0021] Figure 3 for Figure 1 The enlarged schematic diagram of point B in the middle;
[0022] Figure 4 for Figure 1 The enlarged schematic diagram of the center C;
[0023] Figure 5 for Figure 4 A schematic diagram of the structure of the tension switch in FIG.
[0024] Figure numerals: 1-first column, 2-second column, 3-winch, 4-wire system, 41-load-bearing wire, 42-circulating wire, 43-lifting wire, 44-cruise ship, 45-adjusting groove wheel, 46-H-frame, 47-top plate, 5-lead fish, 6-traveling frame, 61-L-plate, 7-limit assembly, 71-first limit switch, 72-bracket, 73-second limit switch, 74-thimble, 75-limit bracket, 76-third limit switch, 77-limit block, 78-elastic switch, 781-housing, 782-spring, 783-connecting rod, 784-fourth limit switch. DETAILED DESCRIPTION
[0025] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Unless otherwise defined, the technical terms or scientific terms used herein should be the common meanings understood by people with general skills in the field to which the utility model belongs.
[0026] The words "first", "second" and similar words used in the specification and claims of the utility model invention application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular form of "a", "an" or "the" and similar words do not indicate a quantitative limitation, but indicate the existence of at least one. "Include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the features, wholes, steps, operations, elements and / or components listed after "include" or "comprise", and do not exclude the existence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0028] Embodiment 1:
[0029] like Figures 1 to 3 As shown, a cableway four-limit position protection device is arranged on a cableway current measuring system; the cableway current measuring system includes a first column 1, a second column 2, a winch 3, a wire system 4, a lead fish 5, a traveling frame 6 and a control system; the first column 1 and the second column 2 are respectively arranged on the banks on both sides; the winch 3 is arranged on the first column 1; the wire system 4 is arranged on the first column 1 and the second column 2, and the first column 1 and the second column 2 are provided with groove wheels to facilitate the movement of the wire system 4; the wire system 4 is connected to the winch 3 and the lead fish 5; the traveling frame 6 is movably arranged on the wire system 4, and the traveling frame 6 is rotatably provided with a groove wheel and moves on the wire system 4; the lead fish 5 is located below the traveling frame 6, and the control system can be arranged on the hydrological station, and the winch 3 and the lead fish 5 are both connected to the control The system is electrically connected; the protective device includes: the limit assembly 7 includes a first limit switch 71 and a bracket 72; the bracket 72 is arranged on the side of the top of the first column 1 close to the traveling frame 6; the first limit switch 71 is arranged on the side of the bracket 72 close to the traveling frame 6; the trigger part of the first limit switch 71 is in the same straight line with the traveling frame 6; the traveling frame 6 also includes an L-shaped plate 61; the top of the traveling frame 6 is provided with an L-shaped plate 61 on one side close to the first column 1; the L-shaped plate 61 and the trigger part of the first limit switch 71 are in the same straight line; the first limit switch 71 is electrically connected to the control system or the winch 3, preferably, the first limit switch 71 is connected to the winch 3 circuit to control the winch 3 to stop running in time, and the first limit switch 71 can be a coil spring type, a rocker type, etc. In addition, it should be noted that the cableway current measurement system belongs to the prior art, the connection method of the first limit switch and the control system, and the specific models of the winch, the lead fish, and the first limit switch are not the improvement points of this application, and will not be repeated here.
[0030] Working method:
[0031] The first column 1 and the second column 2 play a supporting role, supporting the entire system, and controlling the winch 3 through the control system. The winch 3 pulls the wire system 4 so that the traveling frame 6 can travel on the wire system 4, thereby driving the lead fish 5 to move forward, backward, up and down normally, adjust the position of the lead fish 5, and hoist the lead fish 5 into the river for flow measurement. The triggering part of the first limit switch 71 and the L-shaped plate 61 on the traveling frame 6 are located on the same straight line. If the traveling frame 6 moves toward the first limit switch 71 to adjust the position of the lead fish, the network is suddenly delayed or disconnected, and the traveling frame 6 reaches the first column 1, the L-shaped plate 61 and the first limit switch 71 are in the same straight line. The switch 71 is touched, triggering the first limit switch 71, and the first limit switch 71 sends a stop signal to the control system or winch 3, so that the winch 3 stops running and the winch 3 stops rotating, thereby realizing the protection of the cableway lead fish 5 at the extreme limit, preventing the winch 3 from continuing to run, and preventing the lead fish 5 from colliding with the first column 1 to cause damage, thereby improving safety; in addition, if the first limit switch 71 fails, the bracket 72 can support the traveling frame 6 to prevent it from continuing to move forward, forcing the winch 3 to rotate by empty friction, and finally, through the protection setting of the control system, stop the power supply to the winch 3 to realize the stop of the winch 3 and reduce safety hazards.
[0032] Embodiment 2:
[0033] like Figures 1 to 4 As shown, compared with the first embodiment, the difference is that: a structural form of the wire system 4 is given; the wire system 4 includes a load-bearing wire 41, a circulating wire 42, a lifting wire 43 and a cruise ship 44 for adjustment; an adjusting groove wheel 45 is arranged on the cruise ship 44; the two ends of the load-bearing wire 41 are fixedly connected to the first column 1 and the second column 2 respectively; one end of the circulating wire 42 is fixedly connected to the bottom of the traveling frame 6, and the other end thereof passes through the groove wheels on the top of the second column 2 and the top of the first column 1, the adjusting groove wheel 45 on the top of the cruise ship 44 and the winch 3 in sequence, Then it passes through the groove wheel on the bottom of the traveling frame 6 and is connected to the lead fish 5 to realize the forward and backward movement of the traveling frame 6 and the lead fish 5; one end of the lifting wire 43 is fixedly connected to the bottom of the first column 1, and the other end thereof passes through the adjusting groove wheel 45 on the bottom of the cruise ship 44 and the groove wheel on the bottom of the first column 1 in sequence, and is connected to the winch 3 to realize the lifting and lowering of the lead fish 5 in the up and down directions; the load-bearing steel wire 41 is located above the circulating steel wire 42; the groove wheel at the top of the traveling frame 6 is connected to the load-bearing steel wire 41, and the load-bearing steel wire 41 mainly supports the traveling frame 6, is not connected to the winch 3, and is relatively fixed.
[0034] like Figures 1 to 3As shown, preferably, the limit assembly 7 also includes a second limit switch 73 and a ejector pin 74; the second limit switch 73 is arranged on a surface of the bracket 72 close to the traveling frame 6; the ejector pin 74 is arranged on the circulating steel wire 42 and moves with the circulating steel wire 42. The ejector pin 74 is in the shape of a long strip, with smaller dimensions at both ends and larger dimensions in the middle; the second limit switch 73 is located below the first limit switch 71, and the triggering part of the second limit switch 73 is in the same straight line as the ejector pin 74. The second limit switch 73 can be electrically connected to the control system or the winch 3. Preferably, the second limit switch 73 is connected to the winch 3 circuit to timely control the winch 3 to stop running; the ejector pin 74 is located above the groove wheel at the bottom of the traveling frame 6.
[0035] Working method:
[0036] The position of the ejector pin 74 is installed in advance according to the extremely far position of the lead fish 5, and is fixedly installed on the circulating steel wire 42; when the winch 3 drives the traveling frame 6 and the lead fish 5 to move, the ejector pin 74 moves with the circulating steel wire 42, and when the lead fish 5 moves to the extremely far quadrant (the second column 2), the ejector pin 74 passes through the groove wheel of the traveling frame 3 with the circulating steel wire 42, and then continues to move. When the lead fish 5 reaches the extremely far quadrant, the ejector pin 74 triggers the second limit switch 73, and sends a stop signal to the control system or the winch 3, so that the winch 3 stops running, avoids the lead fish and the second column 2 from colliding and causing damage, improves safety, and realizes protection of the extremely far quadrant position; in addition, if the second limit switch 73 fails, the bracket 72 can hold the ejector pin 74 to prevent it from continuing to move forward, forcing the winch 3 to rotate by empty friction, and finally, through the protection setting of the control system, the power supply of the winch 3 is stopped to realize the stop of the winch 3 and reduce safety hazards.
[0037] like Figure 1 , Figure 4 and Figure 5As shown, preferably, the limit assembly 7 also includes a tension switch 78, which is mainly used to protect the extremely low quadrant position of the lead fish 5; the tension switch 78 is arranged at the bottom end of the first column 1; the end of the lifting wire 43 away from the winch 3 is connected to the tension switch 78; the tension switch 78 includes a housing 781, a spring 782, a connecting rod 783 and a fourth limit switch 784; one end of the housing 781 is connected to the bottom end of the first column 1, and the other end thereof is slidably connected to the connecting rod 783; one end of the connecting rod 783 extends into the interior of the housing 781 and faces the connection between the housing 781 and the first column 1, and the other end thereof is connected to the end of the lifting wire 43 away from the winch 3; the spring 782 is located inside the housing 781, one end of which is connected to the end of the connecting rod 783 located inside the housing 781, and the other end thereof is connected to the end of the housing 781 close to the bottom of the first column 1; the fourth limit switch 784 is arranged inside the housing 781, and its trigger end faces the spring Spring 782, and fixedly connected with the middle part of spring 782, the fourth limit switch 784 can be electrically connected with the control system or winch 3, preferably, the fourth limit switch 784 is connected with the winch 3 circuit; the winch 3 pulls the lifting wire 43 to adjust the height position of the cruise ship 44 and the lead fish 5. When the lead fish 5 descends to the river, the winch 3 releases the lifting wire 43, the cruise ship 44 rises, and the lead fish 5 descends at this time. The lifting wire 43 is always pulling the connecting rod 783 and the spring 782, and the trigger part of the fourth limit switch 784 moves with the spring 782. After the lead fish 5 descends to the bottom of the river, the bottom surface of the river supports the lead fish 5, and the cruise ship 44 loses the pulling force of the lead fish 5 and falls. At this time, the lifting wire 43 is more relaxed, and the spring 782 is reset at this time, and the trigger part of the fourth limit switch 784 is started. The fourth limit switch 784 sends a stop signal to the control system or winch 3, so that the winch 3 stops running, improves safety, and realizes the protection of the extremely low quadrant position of the lead fish 5.
[0038] Embodiment three:
[0039] like Figure 1 and Figure 4 As shown, compared with the second embodiment, the difference is that a structural form of a cruise ship 44 is provided; the cruise ship 44 includes an adjusting groove wheel 45 and an H-shaped bracket 46; the adjusting groove wheels 45 are rotatably arranged on the four ends of the H-shaped bracket 46.
[0040] like Figure 4As shown, preferably, the cruise ship 44 also includes a top plate 47; one end of the top plate 47 is fixedly connected to the bottom end of the H-shaped bracket 46, and the other end thereof faces the bottom end of the first column 1; the limit assembly 7 also includes a limit bracket 75 and a third limit switch 76; the bracket 75 is arranged at the bottom end of the first column 1; the top of the bracket 75 is provided with a third limit switch 76; the triggering part of the third limit switch 76 is located on the same straight line as the top plate 47, and the third limit switch 76 can be electrically connected to the control system or the winch 3. Preferably, the third limit switch 76 is connected to the winch 3 circuit to control the winch in time. 3 stops running; the winch 3 pulls the lifting wire to adjust the height positions of the cruise ship 44 and the lead fish 5. When the lead fish rises, the winch retracts the lifting wire 43, the cruise ship 44 descends, and the lead fish 5 rises at this time. When the lead fish 5 rises to the extremely high quadrant (close to the position of the traveling frame 6), the cruise ship 44 descends and approaches the third limit switch 76, and the top plate 47 touches the triggering part of the third limit switch 76, triggering the third limit switch 76. The third limit switch 76 sends a stop signal to the control system or the winch 3, so that the winch 3 stops running, improves safety, and realizes the protection of the extremely high quadrant position of the lead fish 5.
[0041] like Figure 3 As shown, preferably, the limit assembly 7 also includes a limit block 77; the limit block 77 is arranged at one end of the circulating steel wire 42 close to the lead fish 5; the limit block 77 is located below the traveling frame 6; if the third limit switch 76 fails, the limit block 77 supports the groove wheel on the traveling frame 6 to prevent the lead fish 5 from continuing to rise, forcing the winch 3 to rotate by idle friction, and finally, through the protection setting of the control system, the power supply of the winch 3 is stopped to stop the operation of the winch 3 and reduce the safety hazard.
[0042] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A cableway four-limit position protection device, arranged on a cableway current measuring system; the cableway current measuring system comprises a first column (1), a second column (2), a winch (3), a steel wire system (4), a lead fish (5) and a traveling frame (6); the first column (1) and the second column (2) are respectively arranged on the shores on both sides; the winch (3) is arranged on the first column (1); the steel wire system (4) is arranged on the first column (1) and the second column (2); the steel wire system (4) is connected to the winch (3) and the lead fish (5); the traveling frame (6) is movably arranged on the steel wire system (4) and moves on the steel wire system (4); the lead fish (5) is located below the traveling frame (6); It is characterized in that include: A limit assembly (7), comprising a first limit switch (71) and a bracket (72); the bracket (72) is arranged on a surface of the top of the first column (1) close to the traveling frame (6); the first limit switch (71) is arranged on a surface of the bracket (72) close to the traveling frame (6); a triggering part of the first limit switch (71) and the traveling frame (6) are in the same straight line.
2. The cableway four-limit position protection device according to claim 1 is characterized in that: The traveling frame (6) further comprises an L-shaped plate (61); the L-shaped plate (61) is arranged on one side of the top of the traveling frame (6) close to the first upright column (1); the L-shaped plate (61) and the triggering part of the first limit switch (71) are on the same straight line.
3. The cableway four-limit protection device according to claim 1, characterized in that: The steel wire system (4) comprises a load-bearing steel wire (41), a circulating steel wire (42), a lifting steel wire (43) and a cruise ship (44) for adjustment; the cruise ship (44) is provided with an adjustment groove wheel (45); the two ends of the load-bearing steel wire (41) are respectively fixedly connected to the first column (1) and the second column (2); one end of the circulating steel wire (42) is fixedly connected to the bottom of the traveling frame (6), and the other end thereof passes through the groove wheels on the top of the second column (2) and the top of the first column (1), the groove wheels on the top of the cruise ship (44), and the groove wheels on the top of the cruise ship (44). After passing through the adjusting groove wheel (45) and the winch (3), the groove wheel on the bottom of the traveling frame (6) is connected to the lead fish (5); one end of the lifting wire (43) is fixedly connected to the bottom of the first column (1), and the other end of the lifting wire (43) passes through the adjusting groove wheel (45) on the bottom of the cruise ship (44) and the groove wheel on the bottom of the first column (1) in sequence, and is connected to the winch (3); the load-bearing wire (41) is located above the circulating wire (42); and the groove wheel on the top of the traveling frame (6) is connected to the load-bearing wire (41).
4. The cableway four-limit position protection device according to claim 3 is characterized in that: The limit assembly (7) further comprises a second limit switch (73) and a push pin (74); the second limit switch (73) is arranged on a surface of the bracket (72) close to the traveling frame (6); the push pin (74) is arranged on the circulating steel wire (42) and moves with the circulating steel wire (42); the second limit switch (73) is located below the first limit switch (71), and the triggering part of the second limit switch (73) is on the same straight line as the push pin (74); the push pin (74) is located above the groove wheel at the bottom of the traveling frame (6).
5. The cableway four-limit position protection device according to claim 3 is characterized in that: The cruise ship (44) comprises the regulating groove wheel (45) and an H-shaped bracket (46); the regulating groove wheels (45) are rotatably arranged on the four ends of the H-shaped bracket (46).
6. The cableway four-limit position protection device according to claim 5, characterized in that: The cruise ship (44) further comprises a top plate (47); one end of the top plate (47) is fixedly connected to the bottom end of the H-shaped bracket (46), and the other end thereof faces the bottom end of the first column (1); the limit assembly (7) further comprises a limit bracket (75) and a third limit switch (76); the limit bracket (75) is arranged at the bottom end of the first column (1); the third limit switch (76) is arranged on the top of the limit bracket (75); the triggering part of the third limit switch (76) is located on the same straight line as the top plate (47).
7. The cableway four-limit position protection device according to claim 3, characterized in that: The limiting assembly (7) further comprises a limiting block (77); the limiting block (77) is arranged at one end of the circulating steel wire (42) close to the lead fish (5); the limiting block (77) is located below the traveling frame (6).
8. The cableway four-limit position protection device according to claim 3, characterized in that: The limit assembly (7) also includes a tension switch (78); one end of the lifting wire (43) away from the winch (3) is connected to the bottom end of the first column (1) through the tension switch (78); one end of the tension switch (78) is connected to the bottom end of the first column (1), and the other end is connected to the end of the lifting wire (43) away from the winch (3).
9. The cableway four-limit position protection device according to claim 8, characterized in that: The tension switch (78) comprises a housing (781), a spring (782), a connecting rod (783) and a fourth limit switch (784); one end of the housing (781) is connected to the bottom end of the first column (1), and the other end thereof is slidably connected to the connecting rod (783); one end of the connecting rod (783) extends into the interior of the housing (781) and faces the connection between the housing (781) and the first column (1), and the other end thereof is connected to the lifting wire (43). ) is connected to one end away from the winch (3); the spring (782) is located inside the shell (781), one end of which is connected to one end of the connecting rod (783) located inside the shell (781), and the other end of which is connected to one end of the shell (781) close to the bottom of the first column (1); the fourth limit switch (784) is arranged inside the shell (781), the trigger end of which faces the spring (782) and is fixedly connected to the middle part of the spring (782).