Safety limiting device for pull rope oil cylinder

Abstract

The invention belongs to the technical field of fluid braking equipment, and particularly relates to a safety limiting device for a pull rope oil cylinder, which comprises a fixed frame, a sliding base and a hydraulic oil cylinder, the device further comprises a stable transmission mechanism. On one hand, in the stretching and retracting process of the hydraulic oil cylinder, the sliding base is driven to move in the mode that the fixed pulley pushes the transmission steel cable, and in the moving process, due to the fact that the fixed pulley and the transmission steel cable are symmetrically distributed on the upper side and the lower side of the hydraulic oil cylinder, tension of the transmission steel cable on a connecting piece is more balanced; on the other hand, due to the arrangement of the fixed pulley and the sliding base, under the condition that the stroke of the sliding base is fixed, the stroke of the hydraulic oil cylinder is halved, the requirement for the rigidity of the hydraulic oil cylinder is lowered, and the bending probability of the hydraulic oil cylinder is lowered; the stability of the hydraulic oil cylinder for driving the sliding base to move is further enhanced.

Description

Technical Field

[0001] This invention belongs to the field of fluid braking equipment technology, specifically a safety limit device for a rope-pulling cylinder. Background Technology

[0002] The hydraulic cylinder sliding mechanism is a widely used mechanical transmission mechanism that can perform multiple functions depending on its specific installation location. For example, when installed between the excavator's telescopic boom and the main structure, it can act as an adjustment device—relying on the telescopic movement of the hydraulic cylinder, it drives the telescopic boom to slide horizontally relative to the main body, thereby effectively expanding the excavator's working range and reducing the need for frequent equipment movement. It is one of the core devices for enhancing the excavator's multi-functionality.

[0003] In existing hydraulic cylinder sliding mechanisms, a sliding base is connected to two hydraulic cylinders, and the sliding base slides linearly along a fixed frame by the telescopic motion of the two cylinders. In this structure, because the two cylinders and related components are all installed on one side of the sliding base, the force distribution on both sides of the base is uneven during sliding. Therefore, during the entire sliding operation, the sliding base not only exhibits poor operational stability and significant vibration, but also, due to the large stroke of the hydraulic cylinders, higher requirements are placed on its rigidity under external forces such as bending moments. If the rigidity of the hydraulic cylinders is insufficient, slight deformation will occur at the telescopic ends of the cylinders, thereby weakening the overall operational stability and making the vibration and shaking of the sliding base more pronounced during movement.

[0004] In view of this, the present invention proposes a safety limit device for a rope-pulling cylinder to solve the above-mentioned technical problems. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies and solve the aforementioned technical problems, this invention proposes a safety limit device for a rope-pulling hydraulic cylinder.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows: A safety limiting device for a rope-pulling hydraulic cylinder, comprising a fixed frame and a sliding base and a hydraulic cylinder mounted on the fixed frame; it also includes a stabilizing transmission mechanism, which cooperates with the hydraulic cylinder to stably drive the sliding base to slide on the fixed frame; the stabilizing transmission mechanism includes fixed pulleys, a transmission cable, a fixed plate, and a connecting member; the hydraulic cylinder consists of a cylinder body, a piston rod, and a piston element; both ends of the piston rod are fixedly mounted on the fixed frame; the cylinder body is sleeved in the middle of the piston rod; the piston element is fixedly mounted on the piston rod inside the cylinder body; the piston element is slidably and sealingly connected to the cylinder body; both ends of the cylinder body are externally connected to a hydraulic control system via pipes; both ends of the cylinder body are equipped with upper and lower sets of fixed pulleys; the fixed plate is fixedly mounted on the fixed frame; the connecting member is fixedly mounted on the sliding base; transmission cables are fixedly mounted on both sides of the fixed frame; the transmission cables pass over the fixed pulleys and connect to the connecting member.

[0007] Preferably, the connector is equipped with an adjusting pulley, both ends of the transmission cable are fixedly connected to the fixed plate, the middle part of the transmission cable passes around the adjusting pulley, and the transmission cable slides in cooperation with the upper and lower sets of fixed pulleys on the same side.

[0008] Preferably, it also includes an elastic compensation mechanism, which is installed on the connector and is used to transmit changes in the length of the steel cable. The elastic compensation mechanism includes a guide plate, a guide block, and a compensation component. A guide plate is installed on the connector, a guide groove is opened on the guide plate, a guide frame is slidably installed in the guide groove, and the adjusting pulley is installed on the guide frame; The compensation component is installed between the guide frame and the connector, and the compensation component is an elastic telescopic structure.

[0009] Preferably, the connector has a threaded groove, and an adjusting bolt is threaded into each of the threaded grooves. An adjusting plate is installed between the connectors, and the adjusting bolts are rotatably connected to the adjusting plate. A pressure gauge is embedded in the adjusting plate on the side facing the guide frame. The two ends of the compensation component are fixedly connected to the pressure gauge and the guide frame, respectively.

[0010] Preferably, the guide plate has a telescopic groove, in which a hydraulic telescopic rod and a toothed plate are installed. The output end of the hydraulic telescopic rod is fixedly installed with a toothed plate. A locking tooth is installed on the guide frame. The hydraulic telescopic rod is connected to the inner cavity of the cylinder through a pipe. In the initial state, the locking tooth extends into the tooth groove on the toothed plate, and the locking tooth is smaller than the tooth groove width of the toothed plate.

[0011] Preferably, the guide frame has an adapter groove, the locking tooth is slidably installed in the adapter groove, and a push rod is threadedly installed at the end of the adapter groove away from the locking tooth, and the push rod is rotatably connected to the locking tooth.

[0012] Preferably, the teeth and the tooth grooves are rectangular at their closest points, and the teeth and the tooth plate are roughened on their closest points.

[0013] Preferably, a lubricating element is installed on the guide plate, and an oil inlet pipe and an oil outlet pipe are fixedly installed on the lubricating element. The oil inlet pipe is connected to a lubricating oil supply device, and the oil outlet pipe extends to the space between the sliding base and the fixed frame. An oil delivery plate is rotatably installed in the inner cavity of the lubricating element. The oil delivery plate has uniformly distributed grooves in the circumferential direction, and the oil outlet pipe and the oil inlet pipe are both located on the rotation path of the grooves.

[0014] Preferably, a transmission wheel is rotatably mounted on the lubricating component, the transmission wheel is fixedly connected to the oil delivery disc, and the transmission wheel is driven by friction with the fixed frame.

[0015] Preferably, the guide plate has a control groove, the oil inlet pipe extends into the control groove, a rolling roller is rotatably mounted on the guide frame, the rolling roller extends into the control groove, and the oil inlet pipe is located on the rolling path of the rolling roller, and the bottom surface of the control groove is inclined.

[0016] The beneficial effects of this invention are as follows: 1. The safety limit device for a cable-operated hydraulic cylinder described in this invention, through the setting of a stable transmission mechanism, on the one hand, drives the sliding base to move by pushing the transmission steel cable through a fixed pulley during the extension and retraction of the hydraulic cylinder. During the movement, due to the symmetrical distribution of the fixed pulley and the transmission steel cable on the upper and lower sides of the hydraulic cylinder, the tension of the transmission steel cable on the connecting parts is more balanced, thereby enhancing the stability of the hydraulic cylinder driving the sliding base to move. On the other hand, due to the setting of the fixed pulley and the sliding base, when the stroke of the sliding base is constant, the stroke of the hydraulic cylinder is halved, reducing the rigidity requirement of the hydraulic cylinder, reducing the probability of hydraulic cylinder bending, and further enhancing the stability of the hydraulic cylinder driving the sliding base to move. Therefore, when applied to the sliding adjustment of the telescopic boom or bucket of an excavator, it can effectively reduce the vibration and shaking of the telescopic boom or bucket.

[0017] 2. The safety limit device for a rope-pulling cylinder described in this invention, in practical applications, pushes the rolling roller to move when the guide frame moves. During the horizontal movement of the rolling roller, the degree of compression on the oil inlet pipe gradually decreases, thereby enhancing the effect of the oil inlet pipe in transporting lubricating oil, and ultimately improving the efficiency of the oil outlet pipe in discharging lubricating oil. In other words, the greater the friction of the sliding base movement, the higher the efficiency of the oil outlet pipe in discharging lubricating oil, thereby enhancing the intelligence of using lubricating oil to reduce the friction of the sliding base. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is a perspective view of the present invention; Figure 2 This is a perspective view of the invention from another angle; Figure 3 This is a 3D structural diagram of a hydraulic cylinder; Figure 4 It is a 3D assembly view of the hydraulic cylinder and the stabilizing transmission mechanism; Figure 5 It is a three-dimensional view of the stable assembly mechanism; Figure 6 It is an assembly 3D view of the connectors, adjusting pulleys and guide plates; Figure 7 It is a 3D assembly view of the guide plate and guide frame; Figure 8 It is a three-dimensional view of the connector and guide frame; Figure 9 This is a schematic diagram of the assembly of the guide plate and the lubricating components; In the diagram: 1. Fixed frame; 11. Sliding base; 2. Cylinder body; 21. Piston rod; 22. Piston component; 23. Fixed pulley; 24. Fixed plate; 25. Connecting component; 26. Transmission steel cable; 27. Adjusting pulley; 3. Guide plate; 31. Guide groove; 32. Guide frame; 33. Compensating component; 4. Threaded groove; 41. Adjusting bolt; 42. Adjusting plate; 5. Telescopic groove; 51. Hydraulic telescopic rod; 52. Tooth plate; 53. Clamping tooth; 54. Adaptor groove; 55. Push rod; 6. Lubricating component; 61. Oil inlet pipe; 62. Oil outlet pipe; 63. Oil delivery plate; 64. Transmission wheel; 65. Control groove; 66. Rolling roller. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0021] like Figures 1 to 9 As shown, the safety limit device for a rope-pulling cylinder according to the present invention includes a fixed frame 1, a sliding base 11 and a hydraulic cylinder mounted on the fixed frame 1. It also includes a stabilizing transmission mechanism, which is used in conjunction with a hydraulic cylinder to stably drive the sliding base 11 to slide on the fixed frame 1; The stabilizing transmission mechanism includes a fixed pulley 23, a transmission steel cable 26, a fixing plate 24, and a connecting piece 25; The hydraulic cylinder consists of a cylinder body 2, a piston rod 21, and a piston component 22. Both ends of the piston rod 21 are fixedly mounted on a fixed frame 1. The cylinder body 2 is sleeved on the middle of the piston rod 21. The piston component 22 is fixedly mounted inside the cylinder body 2. The piston component 22 is slidably and sealingly connected to the cylinder body 2. Both ends of the cylinder body 2 are connected to a hydraulic control system externally through pipelines. Both ends of the cylinder body 2 are equipped with two sets of upper and lower fixed pulleys 23. The fixing plate 24 is fixedly installed on the fixing frame 1, the connecting piece 25 is fixedly installed on the sliding base 11, and transmission steel cables 26 are fixedly installed on both sides of the fixing frame 1. The transmission steel cables 26 are connected to the connecting piece 25 after passing around the fixed pulley 23.

[0022] The connector 25 is equipped with an adjusting pulley 27. Both ends of the transmission cable 26 are fixedly connected to the fixed plate 24. The middle of the transmission cable 26 passes around the adjusting pulley 27, and the transmission cable 26 is slidably engaged with the upper and lower sets of fixed pulleys 23 on the same side. The setting of the adjusting pulley 27 makes the transmission cable 26 not fixedly connected to the connector 25. Since both ends of the transmission cable 26 are fixed to the fixed plate 24, when the fixed pulleys 23 move, the transmission cable 26 gradually tightens. Under the restriction of the adjusting pulley 27, the transmission cable 26 can adjust itself, so that the transmission cable 26 on the two fixed pulleys 23 on the same side is balanced by force.

[0023] In order to ensure that the hydraulic cylinder sliding mechanism can move stably during application, a stabilizing transmission mechanism is set in the hydraulic cylinder sliding mechanism in this invention. Through the effect of the stabilizing transmission mechanism, the hydraulic cylinder drives the sliding base 11 to operate stably, thereby achieving a stable sliding effect in various equipment. In particular, in the sliding adjustment application of excavator telescopic boom or bucket, it can effectively reduce vibration and shaking during the sliding process.

[0024] Specifically, in this invention, the hydraulic cylinder is fixedly mounted on the mounting bracket 1. When the hydraulic cylinder is working, it is connected to an external hydraulic control system via a pipeline. The cylinder body 2 is fitted onto the middle of the piston rod 21. With the cooperation of the piston element 22 on the piston rod 21, the inner cavity of the cylinder body 2 is divided into two non-communicating chambers. When the hydraulic control system actively adjusts the hydraulic pressure in the two chambers, the cylinder body 2 slides parallel to the piston rod 21 under the action of hydraulic pressure. The direction of sliding is controlled by the comparison of the hydraulic pressure in the two chambers (here, the hydraulic cylinder is a bidirectional telescopic cylinder, a mature existing technology, which will not be elaborated further). After the hydraulic cylinder is started, the cylinder body 2 moves on the piston rod 21. The fixed pulleys 23 at both ends of the cylinder 2 move synchronously. Since the fixed plate 24 and connecting piece 25 fixedly installed on the fixed frame 1 and the sliding base 11 are connected by the transmission steel cable 26, and the transmission steel cable 26 cooperates with the fixed pulleys 23, when the cylinder 2 moves, as the relative displacement between the cylinder 2 and the fixed plate 24 proceeds, the sliding base 11 moves on the fixed frame 1 under the transmission action of the transmission steel cable 26. Due to the setting of the fixed pulleys 23 and the transmission steel cable 26, the moving stroke of the sliding base 11 is twice the moving stroke of the cylinder 2. Therefore, when the moving stroke of the sliding base 11 is constant, compared with the direct drive of the double cylinders, the moving stroke of the cylinder can be effectively reduced.

[0025] This invention, by setting up a stable transmission mechanism, on the one hand, drives the sliding base 11 to move by pushing the transmission cable 26 through the fixed pulley 23 during the extension and retraction of the hydraulic cylinder. During the movement, the fixed pulley 23 and the transmission cable 26 are symmetrically distributed on the upper and lower sides of the hydraulic cylinder, making the tension of the transmission cable 26 on the connecting member 25 more balanced, thereby enhancing the stability of the movement of the sliding base 11 driven by the hydraulic cylinder. On the other hand, due to the setting of the fixed pulley 23 and the sliding base 11, the movement stroke of the hydraulic cylinder is halved when the movement stroke of the sliding base 11 is constant, reducing the rigidity requirement of the hydraulic cylinder, reducing the probability of hydraulic cylinder bending, and further enhancing the stability of the movement of the sliding base 11 driven by the hydraulic cylinder. Therefore, when applied to the sliding adjustment of the telescopic boom or bucket of an excavator, it can effectively reduce the vibration and shaking of the telescopic boom or bucket.

[0026] As a preferred embodiment of the present invention, it further includes an elastic compensation mechanism, which is installed on the connector 25 and is used to transmit changes in the length of the steel cable 26. The elastic compensation mechanism includes a guide plate 3, a guide block, and a compensation component 33. A guide plate 3 is installed on the connector 25. A guide groove 31 is provided on the guide plate 3. A guide frame 32 is slidably installed in the guide groove 31. The adjusting pulley 27 is installed on the guide frame 32. The compensation component 33 is installed between the guide frame 32 and the connector 25, and the compensation component 33 is an elastic telescopic structure.

[0027] The connector 25 has a threaded groove 4, and an adjusting bolt 41 is threadedly installed in each of the threaded grooves 4. An adjusting plate 42 is installed between the connectors 25. The adjusting bolt 41 is rotatably connected to the adjusting plate 42. A pressure gauge is embedded in the adjusting plate 42 facing the guide frame 32. The two ends of the compensation member 33 are fixedly connected to the pressure gauge and the guide frame 32, respectively.

[0028] Due to the influence of environmental temperature, friction, tension, and other factors during long-term application, the length of the transmission cable 26 varies. With the positions of the fixed plate 24 and the connecting piece 25 remaining unchanged, this change in length leads to changes in tension, potentially causing a decrease in transmission stability over time. This is especially true in cold weather, where the transmission cable 26 contracts and its tension increases. When the hydraulic cylinder sliding mechanism is activated, the tension of the transmission cable 26 not only increases the friction between it and the fixed pulley 23 but also poses a risk of breakage. Therefore, in this invention, an elastic compensation mechanism is installed on the connecting piece 25. During equipment assembly, after both ends of the transmission cable 26 are connected to the fixed plate 24, the operator can use tools to tighten the adjusting bolts 41, creating a push-pull effect on the adjusting plate 42, thereby adjusting the distance between the adjusting plate 42 and the connecting piece 25. The adjusting plate 42, in turn, pushes the compensation piece 33 through a pressure gauge embedded in its surface. The compensating component 33 pushes the guide frame 32, causing the guide frame 32 and the adjusting pulley 27 to slide under the guidance of the guide groove 31, thereby adjusting the tension of the transmission cable 26. The presence of the pressure gauge allows the operator to judge the tension of the transmission cable 26 in real time. During long-term use after adjustment, when the length of the transmission cable 26 changes due to external factors, the compensating component 33, being made of an elastic telescopic structure, can compensate for the tension change caused by the change in the length of the transmission cable 26, reducing the amplitude of the tension change. At the same time, during the active movement of the cylinder 2, the transmission cable 26 pulls the connecting component 25 and the sliding base 11. When the sliding base 11 is stopped due to unexpected factors, the transmission cable 26 pushes the adjusting pulley 27 and the guide frame 32, forcing the compensating component 33 to increase its telescopic range. This also provides time for the hydraulic oil to stop, further reducing the probability of a sudden increase in tension on the transmission cable 26.

[0029] In a preferred embodiment of the present invention, the guide plate 3 is provided with a telescopic groove 5, and a hydraulic telescopic rod 51 and a toothed plate 52 are installed in the telescopic groove 5. The output end of the hydraulic telescopic rod 51 is fixedly installed with the toothed plate 52. The guide frame 32 is provided with a locking tooth 53. The hydraulic telescopic rod 51 is connected to the inner cavity of the cylinder 2 through a pipe. In the initial state, the locking tooth 53 extends into the tooth groove on the toothed plate 52, and the locking tooth 53 is smaller than the tooth groove width of the toothed plate 52.

[0030] The guide frame 32 is provided with an adapter groove 54, and the locking tooth 53 is slidably installed in the adapter groove 54. A push rod 55 is threadedly installed at the end of the adapter groove 54 away from the locking tooth 53. The push rod 55 is rotatably connected to the locking tooth 53. The presence of the push rod 55 facilitates the active pulling of the locking tooth 53 into the adapter groove 54 when maintaining or adjusting the initial position of the guide frame 32.

[0031] The tooth 53 and the tooth groove are both rectangular at one end, and the tooth 53 and the tooth plate 52 are both rough at one end.

[0032] When the transmission cable 26 is not under tension, its length changes, resulting in a small extension range of the compensating member 33. However, during the process of the transmission cable 26 pulling the sliding base 11, when the sliding base 11 is stopped due to external factors, the extension range of the compensating member 33 is larger under tension. Therefore, in order to control the extension range of the extension member according to the working conditions, in this invention, when the hydraulic cylinder is in a non-starting state, the hydraulic pressure in the chambers at both ends of the cylinder body 2 is lower than the working pressure, and the hydraulic telescopic rod 51 connected to the inner cavity of the cylinder body 2 is in a contracted state. This causes the toothed plate 52 to approach the opening end of the telescopic groove 5. At this time, the locking tooth 53 is located in the tooth groove on the toothed plate 52. Since the width of the locking tooth 53 is smaller than the width of the tooth groove, when the transmission cable 26 changes length, the guide frame 32 moves, causing the locking tooth 53 to move. The tooth 53 moves in the tooth groove to compensate for the tension of the transmission steel cable 26. Therefore, when the sliding base 11 is subjected to external force, the position of the cylinder 2 is fixed. Since the tooth plate 52 restricts the tooth 53, the sliding base 11 can only move within a small range of the tooth groove width. This prevents the sliding base 11 from shaking significantly under external force when the hydraulic cylinder sliding mechanism is not activated. When the hydraulic cylinder is activated, the hydraulic pressure in the inner cavity of the cylinder 2 increases, causing the hydraulic telescopic rod 51 to extend and push the tooth plate 52 to move deeper into the telescopic groove 5. This causes the tooth plate 52 to separate from the tooth 53, thereby increasing the relative displacement distance between the guide and the connecting member 25. This allows the compensation member 33 to buffer the sliding base 11 when it is unexpectedly stopped, giving the hydraulic cylinder time to stop.

[0033] In a preferred embodiment of the present invention, a lubricating element 6 is installed on the guide plate 3. An oil inlet pipe 61 and an oil outlet pipe 62 are fixedly installed on the lubricating element 6. The oil inlet pipe 61 is externally connected to a lubricating oil supply device. The oil outlet pipe 62 extends between the sliding base 11 and the fixed frame 1. An oil delivery plate 63 is rotatably installed in the inner cavity of the lubricating element 6. The oil delivery plate 63 has uniformly distributed grooves in the circumferential direction. The oil outlet pipe 62 and the oil inlet pipe 61 are both located on the rotation path of the grooves.

[0034] The lubricating component 6 is rotatably mounted with a transmission wheel 64, which is fixedly connected to the oil delivery plate 63 and is driven by friction with the fixed frame 1.

[0035] The guide plate 3 is provided with a control groove 65, the oil inlet pipe 61 extends into the control groove 65, the guide frame 32 is rotatably mounted with a rolling roller 66, the rolling roller 66 extends into the control groove 65, and the oil inlet pipe 61 is located on the rolling path of the rolling roller 66. The bottom surface of the control groove 65 is inclined.

[0036] To further enhance the stability of the sliding base 11's movement, in this invention, when the hydraulic cylinder is activated, the cylinder body 2 moves and, after being transmitted by the stabilizing transmission mechanism, causes the sliding base 11 to translate on the fixed frame 1. At this time, the transmission wheel 64 and the fixed frame 1 generate relative displacement, causing the oil delivery plate 63 to rotate in the inner cavity of the lubricating component 6. Lubricating oil enters the inner cavity of the lubricating component 6 through the oil inlet pipe 61 and flows into the groove on the oil delivery plate 63. When the groove on the oil delivery plate 63 aligns with the oil outlet pipe 62 during rotation, the lubricating oil, guided by the oil outlet pipe 62, drips between the sliding base 11 and the fixed frame 1. Through lubrication, the sliding friction of the sliding base 11 on the fixed frame 1 is further reduced, thereby improving the stability of the sliding base 11 during movement. Simultaneously, due to the sliding... The frictional resistance of the base 11 during movement and the thrust generated by the transmission cable 26 on the adjusting pulley 27 will ultimately act on the compensating member 33, causing the compensating member 33 to extend and retract. The greater the frictional resistance, the greater the extension and retraction length of the compensating member 33, and the greater the moving distance of the guide frame 32. Therefore, in practical applications, when the guide frame 32 moves, it pushes the rolling roller 66 to move. During the horizontal movement of the rolling roller 66, the degree of compression on the oil inlet pipe 61 gradually decreases, thereby enhancing the effect of the oil inlet pipe 61 in conveying lubricating oil. Ultimately, this improves the efficiency of the oil outlet pipe 62 in discharging lubricating oil. In other words, the greater the frictional force of the sliding base 11, the higher the efficiency of the oil outlet pipe 62 in discharging lubricating oil, thus enhancing the intelligence of using lubricating oil to reduce the friction of the sliding base 11.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A safety limit device for a rope-pulling cylinder, comprising a fixed frame (1), a sliding base (11) mounted on the fixed frame (1), and a hydraulic cylinder; characterized in that: It also includes a stabilizing transmission mechanism, which is used in conjunction with a hydraulic cylinder to stably drive the sliding base (11) to slide on the fixed frame (1); The stable transmission mechanism includes a fixed pulley (23), a transmission cable (26), a fixed plate (24), and a connector (25); the hydraulic cylinder is composed of a cylinder body (2), a piston rod (21), and a piston component (22). Both ends of the piston rod (21) are fixedly installed on the fixed frame (1). The cylinder body (2) is sleeved in the middle of the piston rod (21). The piston rod (21) is fixedly installed with the piston component (22) inside the cylinder body (2). The piston component (22) is slidably sealed to the cylinder body (2). Both ends of the cylinder body (2) are connected to the external hydraulic control system through pipes. Both ends of the cylinder body (2) are equipped with two sets of fixed pulleys (23). The fixed plate (24) is fixedly installed on the fixed frame (1). The connector (25) is fixedly installed on the sliding base (11). Both sides of the fixed frame (1) are fixedly installed with transmission cables (26). The transmission cables (26) pass around the fixed pulleys (23) and are connected to the connector (25).

2. The safety limit device for a rope-pulling cylinder according to claim 1, characterized in that: The connector (25) is equipped with an adjusting pulley (27), both ends of the transmission cable (26) are fixedly connected to the fixing plate (24), the middle part of the transmission cable (26) passes around the adjusting pulley (27), and the transmission cable (26) is in sliding cooperation with the upper and lower fixed pulleys (23) on the same side.

3. A safety limit device for a rope-pulling cylinder according to claim 2, characterized in that: It also includes an elastic compensation mechanism, which is installed on the connector (25). The elastic compensation mechanism is used to transmit the change in length of the steel cable (26). The elastic compensation mechanism includes a guide plate (3), a guide block and a compensation component (33). A guide plate (3) is installed on the connector (25), and a guide groove (31) is provided on the guide plate (3). A guide frame (32) is slidably installed in the guide groove (31), and an adjusting pulley (27) is installed on the guide frame (32). A compensation component (33) is installed between the guide frame (32) and the connector (25), and the compensation component (33) is an elastic telescopic structure.

4. A safety limit device for a rope-pulling cylinder according to claim 3, characterized in that: The connector (25) has a threaded groove (4), and an adjusting bolt (41) is threadedly installed in each of the threaded grooves (4). An adjusting plate (42) is installed between the connectors (25). The adjusting bolt (41) is rotatably connected to the adjusting plate (42). A pressure gauge is embedded in the adjusting plate (42) on the side facing the guide frame (32). The two ends of the compensation component (33) are fixedly connected to the pressure gauge and the guide frame (32) respectively.

5. A safety limit device for a rope-pulling cylinder according to claim 4, characterized in that: The guide plate (3) is provided with a telescopic groove (5), and a hydraulic telescopic rod (51) and a toothed plate (52) are installed in the telescopic groove (5). The output end of the hydraulic telescopic rod (51) is fixedly installed with the toothed plate (52). The guide frame (32) is provided with a locking tooth (53). The hydraulic telescopic rod (51) is connected to the inner cavity of the cylinder (2) through a pipe. In the initial state, the locking tooth (53) extends into the tooth groove on the toothed plate (52), and the locking tooth (53) is smaller than the tooth groove width of the toothed plate (52).

6. A safety limit device for a rope-pulling cylinder according to claim 5, characterized in that: The guide frame (32) is provided with an adapter groove (54), and the locking tooth (53) is slidably installed in the adapter groove (54). A push rod (55) is threadedly installed at the end of the adapter groove (54) away from the locking tooth (53), and the push rod (55) is rotatably connected to the locking tooth (53).

7. A safety limit device for a rope-pulling cylinder according to claim 5, characterized in that: The tooth (53) and the tooth groove are both rectangular at one end, and the tooth (53) and the tooth plate (52) are both rough at one end.

8. A safety limit device for a rope-pulling cylinder according to claim 7, characterized in that: A lubricating element (6) is installed on the guide plate (3). An oil inlet pipe (61) and an oil outlet pipe (62) are fixedly installed on the lubricating element (6). The oil inlet pipe (61) is connected to a lubricating oil supply device. The oil outlet pipe (62) extends between the sliding base (11) and the fixed frame (1). An oil delivery plate (63) is rotatably installed in the inner cavity of the lubricating element (6). The oil delivery plate (63) has evenly distributed grooves in the circumferential direction. The oil outlet pipe (62) and the oil inlet pipe (61) are both located on the rotation path of the grooves.

9. A safety limit device for a rope-pulling cylinder according to claim 8, characterized in that: The lubricating component (6) is externally mounted with a transmission wheel (64), which is fixedly connected to the oil delivery plate (63). The transmission wheel (64) is driven by friction with the fixed frame (1).

10. A safety limit device for a rope-pulling cylinder according to claim 9, characterized in that: The guide plate (3) is provided with a control groove (65), the oil inlet pipe (61) extends into the control groove (65), the guide frame (32) is rotatably mounted with a rolling roller (66), the rolling roller (66) extends into the control groove (65), and the oil inlet pipe (61) is located on the rolling path of the rolling roller (66). The bottom surface of the control groove (65) is inclined.

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