Resistance type height limiting device and crane

Abstract

The invention discloses a resistance type height limiting device and a crane, and relates to the technical field of cranes. The resistance type height limiting device is used for the hoisting device, the hoisting device can stretch out and draw back and / or swing, and the resistance type height limiting device comprises a displacement conversion device and a sliding resistance assembly. One end of the displacement conversion device is connected with the hoisting device, the other end of the displacement conversion device is connected with the sliding resistor assembly, and the displacement conversion device can convert the height of the hoisting device into the displacement of the sliding resistor assembly to change the resistance of the sliding resistor assembly and obtain the height of the hoisting device, so that the height of the hoisting device can be measured; and the height of the hoisting device is measured more accurately, so that an operator can know the height of the hoisting device in time, the hoisting device is prevented from touching other facilities, and the safety in the hoisting process is improved.

Description

Technical Field

[0001] The invention relates to the technical field of cranes, and in particular to a resistance-type height-limiting device and a crane. Background Art

[0002] During the crane hoisting process, some hoisting construction situations do not need to consider the boom height, so most crane equipment does not pay attention to the real-time display of the boom height. However, in actual projects, there may be some facilities on the top of the crane that affect the hoisting construction, such as high-voltage wires. The top of the crane's boom is easy to touch these facilities during the lifting process, posing a safety hazard.

[0003] In the prior art, the crane operator usually manually determines the height of the crane boom, which places high demands on the crane operator. Manually determining the height of the boom is erroneous and inaccurate, which is prone to misjudgment, has low safety, and may delay the construction progress. Some cranes are equipped with a height measuring device, and the boom height can be displayed in the operating instrument, but its measurement error and accuracy are low, and in actual projects, it is often necessary to accurately determine the boom height. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a resistive height limiting device and a crane in order to overcome the defects in the prior art that the boom height of the crane is difficult to measure and is prone to potential safety hazards.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] The present invention provides a resistance type height limiting device, which is used for a hoisting device, and the hoisting device can be extended and / or swung, and the resistance type height limiting device includes a displacement conversion device and a sliding resistance component;

[0007] One end of the displacement conversion device is connected to the lifting device, and the other end of the displacement conversion device is connected to the sliding resistor assembly. The displacement conversion device can convert the height of the lifting device into the displacement of the sliding resistor assembly to change the resistance of the sliding resistor assembly and obtain the height of the lifting device.

[0008] In this scheme, a resistive height limiting device is provided on the lifting device, and the resistive height limiting device includes a displacement conversion device and a sliding resistor assembly. The two ends of the displacement conversion device are respectively connected to the lifting device and the sliding resistor assembly. The displacement conversion device can convert the height of the lifting device into the displacement of the sliding resistor assembly. The displacement change of the sliding resistor assembly causes the resistance of the sliding resistor assembly to change, and then the height of the lifting device is obtained through the resistance change of the sliding resistor assembly, so that the height of the lifting device can be measured, and the height measurement of the lifting device is more accurate, so that the operator can promptly determine the height of the lifting device, avoid the lifting device touching other facilities, and improve the safety during the lifting process.

[0009] Preferably, the sliding resistor assembly comprises a resistor body, a wire and a sliding resistor contact pin;

[0010] The sliding resistor contact pin contacts the resistor body, and the displacement conversion device can drive the sliding resistor contact pin to slide along the resistor body to change the resistance of the resistor body. One end of the wire is connected to the resistor body, and the other end of the wire is connected to the sliding resistor contact pin.

[0011] In this solution, the sliding resistor assembly is composed of a resistor body, a wire and a sliding resistor contact pin. The sliding resistor contact pin can slide along the resistor body to change the resistance of the resistor body. One end of the wire is connected to the resistor body, and the other end of the wire is connected to the sliding resistor contact pin, so that a loop is formed between the resistor body, the guide and the sliding resistor contact pin. When the height of the lifting device changes, the lifting device drives the displacement conversion device to move, so that the displacement conversion device can drive the sliding resistor contact pin to slide along the resistor body to change the resistance of the resistor body, and then obtain the height change of the lifting device through the resistance change of the resistor body.

[0012] Preferably, the sliding resistor assembly further comprises a support frame, the support frame is provided with a slide groove, and the sliding resistor contact pin can slide along the slide groove.

[0013] In this solution, the sliding resistor assembly is provided with a support frame with a slide groove, and the sliding resistor contact pin can slide along the slide groove, so that the sliding resistor contact pin can slide on the resistor body, thereby changing the resistance of the resistor body.

[0014] Preferably, the displacement conversion device comprises a sliding member, the sliding member is connected to the resistor body, the resistor body extends in a vertical direction, the slide groove extends in a horizontal direction, and the sliding member always remains parallel to the telescopic direction of the lifting device;

[0015] And / or, the displacement conversion device further includes a limiter, and the limiter can limit the extending direction of the sliding member to always remain parallel to the telescopic direction of the lifting device.

[0016] In this solution, by keeping the resistor body extending in the vertical direction, the slide groove extending in the horizontal direction, and the sliding member always parallel to the extension direction of the lifting device, the triangle formed by the sliding member, the resistor body and the slide groove is similar to the triangle formed by the length of the lifting device, the height of the lifting device and the horizontal projection of the lifting device, and the size of the resistor is proportional to the height of the lifting device, so that the height of the lifting device can be obtained through the size of the resistor. The displacement conversion device also includes a limiter, which can limit the direction of the sliding member so that the extension direction of the sliding member is always parallel to the extension direction of the lifting device.

[0017] Preferably, the sliding resistor assembly further comprises a counterweight, and the counterweight is suspended at the lower end of the resistor body.

[0018] In this solution, the sliding resistor assembly is further provided with a counterweight, which is suspended at the lower end of the resistor body, so that the extension direction of the resistor body can always remain in the vertical direction.

[0019] Preferably, the displacement conversion device comprises a connecting member, a roller assembly and a sliding member, the lifting device comprises a support and a rotating member, the lower end of the rotating member is rotatably connected to the support, and the rotating member can be extended and retracted along its own extension direction;

[0020] The roller assembly is arranged on the support, one end of the connecting member is connected to the rotating member, the other end of the connecting member is connected to the roller assembly, the sliding member is connected to the roller assembly, the roller assembly drives the sliding member to move, and the sliding member drives the sliding resistor assembly to move.

[0021] In this solution, the hoisting device includes a support and a rotating member, the lower end of the rotating member is rotatably connected to the support, so that the rotating member can swing around the support, and the rotating member can be extended and retracted along its own extension direction. The roller assembly is arranged on the support, and the two ends of the connecting member are respectively connected to the rotating member and the roller assembly. When the rotating member is extended and / or swung, the displacement change of the rotating member can be transmitted to the roller assembly, and the roller assembly then drives the sliding member to move, and the sliding member drives the sliding resistor assembly to move, so that the extension and / or swing of the rotating member can be converted into the resistance change of the sliding resistor assembly, and then the height of the hoisting device is calculated according to the resistance of the sliding resistor assembly.

[0022] Preferably, the roller assembly comprises a first transmission wheel, a second transmission wheel and a transmission belt;

[0023] The connecting member is connected to the first transmission wheel, the transmission belt connects the first transmission wheel and the second transmission wheel, the rotation speed of the second transmission wheel is lower than the rotation speed of the first transmission wheel, and the second transmission wheel drives the sliding member to slide.

[0024] In the present solution, the roller assembly includes two transmission wheels, which are connected by a transmission belt. A connecting member connects the first transmission wheel and the rotating member. The rotation speed of the second transmission wheel is lower than that of the first transmission wheel, thereby converting a larger displacement of the rotating member into a smaller displacement of the second transmission wheel, and converting a larger height change of the lifting device into a smaller displacement of the sliding resistor assembly, thereby reducing the volume of the resistive height limiting device and making it easier to measure the height of the lifting device.

[0025] Preferably, the first transmission wheel comprises a first outer ring and a first inner ring fixed at the center of the first outer ring, the radius of the first inner ring is smaller than the radius of the first outer ring, and the second transmission wheel comprises a second outer ring and a second inner ring fixed at the center of the first outer ring, the radius of the second inner ring is smaller than the radius of the second outer ring;

[0026] The connecting member is connected to the first outer ring, the connecting member drives the first outer ring to rotate, the transmission belt connects the first inner ring and the second outer ring, and the sliding member is slidably connected to the second inner ring;

[0027] And / or, the second inner ring is a gear, a rack is provided on one side of the sliding member, and the rack is meshed with the gear.

[0028] In this solution, the connecting member is connected to the first outer ring, and the transmission belt is connected to the first inner ring. When the connecting member drives the first outer ring to rotate, the first inner ring will also rotate synchronously. Since the radius of the first inner ring is smaller than the radius of the first outer ring, when the first inner ring rotates at the same angle, the circumferential displacement of the first inner ring is smaller than the circumferential displacement of the first outer ring, that is, the moving distance of the transmission belt is smaller than the moving distance of the rotating member. The transmission belt is also connected to the second outer ring, and the transmission belt drives the second outer ring to move, so that the displacement of the circumference of the first inner ring can be converted into the displacement of the circumference of the second outer ring. Since the radius of the second inner ring is smaller than the radius of the second outer ring, when the second inner ring rotates at the same angle, the circumferential displacement of the second inner ring is smaller than the circumferential displacement of the second inner ring, further reducing the displacement size. The second inner ring is connected to the sliding member, so that the larger displacement of the connecting member is converted into the smaller displacement of the sliding member. The second inner ring is a gear, and a rack is provided on one side of the sliding member, and the rack is meshed with the gear. When the gear rotates, the gear drives the rack meshed with the gear to move, thereby realizing the displacement of the sliding member.

[0029] Preferably, the resistive height limiting device further comprises an alarm device, and the alarm device can issue an alarm according to the resistance of the sliding resistor component.

[0030] In this scheme, the resistive height limiting device is also provided with an alarm device, which can sound an alarm according to the resistance of the sliding resistor component. When the resistance of the sliding resistor component reaches a certain warning value, it means that the height of the lifting device has reached the warning position. At this time, the alarm device can sound an alarm to remind the operator to pay attention to the height of the lifting device, thereby ensuring safety during the lifting process.

[0031] The present invention also provides a crane, comprising the hoisting device and the above-mentioned resistance-type height-limiting device.

[0032] In this solution, the crane has the same effect as the above-mentioned resistance-type height-limiting device.

[0033] The positive and progressive effects of the present invention are:

[0034] The lifting device is provided with a resistive height limiting device, which includes a displacement conversion device and a sliding resistor assembly. The two ends of the displacement conversion device are respectively connected to the lifting device and the sliding resistor assembly. The displacement conversion device can convert the height of the lifting device into the displacement of the sliding resistor assembly. The displacement change of the sliding resistor assembly causes the resistance of the sliding resistor assembly to change, and then the height of the lifting device is obtained through the resistance change of the sliding resistor assembly, so that the height of the lifting device can be measured, so that the operator can promptly determine the height of the lifting device, avoid the lifting device touching other facilities, and improve the safety during the lifting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 FIG. 4 is a side view of a crane according to an embodiment of the present invention.

[0036] Figure 2 for Figure 1 Magnified view of part A.

[0037] Figure 3 for Figure 2 Magnified view of part B.

[0038] Figure 4 for Figure 2 Top view of part B.

[0039] Figure 5 for Figure 2 Magnified view of part C.

[0040] Description of reference numerals:

[0041] Lifting device 100

[0042] Support 110

[0043] Rotating member 120

[0044] Resistive height limit device 200

[0045] Displacement conversion device 300

[0046] Connector 310

[0047] Roller assembly 320

[0048] First transmission wheel 321

[0049] Second transmission wheel 322

[0050] First outer ring 323

[0051] First inner circle 324

[0052] Second outer ring 325

[0053] Second inner circle 326

[0054] Transmission belt 327

[0055] Sliding member 330

[0056] Limiting piece 340

[0057] Sliding resistor assembly 400

[0058] Resistor body 410

[0059] Wire 420

[0060] Sliding resistor contact pin 430

[0061] Support frame 440

[0062] Chute 441

[0063] Counterweight 450

[0064] Alarm device 500

[0065] Gear 610

[0066] Rack 620 DETAILED DESCRIPTION

[0067] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the following examples.

[0068] like Figure 1As shown, this embodiment provides a crane, which includes a hoisting device 100 and a resistive height limiting device 200. The hoisting device 100 can be extended and / or swung, and the hoisting device 100 includes a support 110 and a rotating member 120. The lower end of the rotating member 120 is rotatably connected to the support 110, so that the rotating member 120 can swing around the support 110, and the rotating member 120 can be extended and retracted along its own extension direction. In this embodiment, the hoisting device 100 is the boom of the crane.

[0069] like Figure 2-Figure 5 As shown, the resistive height limiting device 200 is used for the hoisting device 100, and the resistive height limiting device 200 includes a displacement conversion device 300 and a sliding resistor assembly 400. One end of the displacement conversion device 300 is connected to the hoisting device 100, and the other end of the displacement conversion device 300 is connected to the sliding resistor assembly 400. The displacement conversion device 300 can convert the height of the hoisting device 100 into the displacement of the sliding resistor assembly 400, so as to change the resistance of the sliding resistor assembly 400 and obtain the height of the hoisting device 100.

[0070] When the lifting device 100 is extended and / or swung, the height of the lifting device 100 changes. The two ends of the displacement conversion device 300 are respectively connected to the lifting device 100 and the sliding resistor assembly 400. The displacement conversion device 300 can convert the height of the lifting device 100 into the displacement of the sliding resistor assembly 400. The displacement change of the sliding resistor assembly 400 causes the resistance of the sliding resistor assembly 400 to change, and then the height of the lifting device 100 is obtained through the resistance change of the sliding resistor assembly 400, so that the height of the lifting device 100 can be measured, and the height measurement of the lifting device 100 is more accurate, so that the operator can promptly determine the height of the lifting device 100, avoid the lifting device 100 touching other facilities, and improve the safety during the lifting process.

[0071] The resistive height limiting device 200 can be attached to the crane. If the crane itself is not equipped with a height measuring device, the resistive height limiting device 200 can accurately measure the hoisting device 100 in real time and give an early warning when the height limit is reached. If the crane itself is equipped with a height measuring device, the resistive height limiting device 200 can be used to verify the height measuring device of the crane itself, thereby ensuring the accuracy of the height measurement.

[0072] The sliding resistor assembly 400 includes a resistor body 410, a wire 420 and a sliding resistor contact pin 430. The sliding resistor contact pin 430 contacts the resistor body 410, and the displacement conversion device 300 can drive the sliding resistor contact pin 430 to slide along the resistor body 410 to change the resistance of the resistor body 410. One end of the wire 420 is connected to the resistor body 410, and the other end of the wire 420 is connected to the sliding resistor contact pin 430, so that a loop is formed between the resistor body 410, the guide and the sliding resistor contact pin 430. When the height of the lifting device 100 changes, the lifting device 100 drives the displacement conversion device 300 to move, so that the displacement conversion device 300 can drive the sliding resistor contact pin 430 to slide along the resistor body 410 to change the resistance of the resistor body 410, and then obtain the height change of the lifting device 100 through the resistance change of the resistor body 410. The principle of changing the resistance by moving the sliding resistor contact pin 430 is a prior art and will not be repeated here.

[0073] The sliding resistor assembly 400 further includes a support frame 440 , on which a slide groove 441 is provided. The sliding resistor contact pin 430 can slide along the slide groove 441 , so that the sliding resistor contact pin 430 can slide on the resistor body 410 , thereby changing the resistance of the resistor body 410 .

[0074] The displacement conversion device 300 includes a connecting member 310, a roller assembly 320 and a sliding member 330. The roller assembly 320 is disposed on the support 110, one end of the connecting member 310 is connected to the rotating member 120, the other end of the connecting member 310 is connected to the roller assembly 320, the sliding member 330 is connected to the roller assembly 320, the roller assembly 320 drives the sliding member 330 to move, and the sliding member 330 drives the sliding resistor assembly 400 to move.

[0075] The two ends of the connecting member 310 are respectively connected to the rotating member 120 and the roller assembly 320. When the rotating member 120 is extended and / or swung, the displacement change of the rotating member 120 can be transmitted to the roller assembly 320, and the roller assembly 320 then drives the sliding member 330 to move, and the sliding member 330 drives the sliding resistor assembly 400 to move, so that the extension and / or swing of the rotating member 120 can be converted into the resistance change of the sliding resistor assembly 400, and then the height of the lifting device 100 is calculated according to the resistance of the sliding resistor assembly 400.

[0076] In this embodiment, the connecting member 310 is a connecting rope, the upper end of which is fixed to the top of the rotating member 120, and the lower end of which is wound around the roller assembly 320, so that when the rotating member 120 is extended and / or swung, the connecting rope can drive the roller assembly 320 to move. In other embodiments, the connecting member 310 may also be other structures that are considered appropriate by those skilled in the art.

[0077] In this embodiment, by fixing the upper end of the connecting rope to the top of the rotating member 120, the displacement of the top of the rotating member 120 can be better transmitted to the roller assembly 320. In other embodiments, the upper end of the connecting rope can also be fixed to other positions of the rotating member 120.

[0078] The sliding member 330 is connected to the resistor body 410, the resistor body 410 extends in the vertical direction, the slide groove 441 extends in the horizontal direction, and the sliding member 330 always remains parallel to the extension direction of the hanging device 100, so that the triangle formed by the sliding member 330, the resistor body 410 and the slide groove 441 is similar to the triangle formed by the length of the hanging device 100, the height of the hanging device 100 and the horizontal projection of the hanging device 100. The size of the resistor is proportional to the height of the hanging device 100, so the height of the hanging device 100 can be obtained by the size of the resistor. The displacement conversion device 300 also includes a limiter 340, which can limit the extension direction of the sliding member 330 to always remain parallel to the extension direction of the hanging device 100.

[0079] In this embodiment, the resistor body 410 extends in the vertical direction, the slide groove 441 extends in the horizontal direction, the sliding member 330 always remains parallel to the extension direction of the hanging device 100, and the sliding member 330, the resistor body 410 and the slide groove 441 form a similar triangle of the hanging device 100. In other embodiments, the resistor body 410, the slide groove 441 and the sliding member 330 may also extend in other directions, and the height of the hanging device 100 may also be calculated by the resistance of the resistor body 410.

[0080] The sliding resistor assembly 400 further includes a weight 450 , which is suspended at the lower end of the resistor body 410 , so that the extending direction of the resistor body 410 can always remain in a vertical direction.

[0081] The roller assembly 320 includes a first transmission wheel 321, a second transmission wheel 322 and a transmission belt 327. The connecting member 310 is connected to the first transmission wheel 321, and the transmission belt 327 connects the first transmission wheel 321 and the second transmission wheel 322. The rotation speed of the second transmission wheel 322 is lower than the rotation speed of the first transmission wheel, and the second transmission wheel 322 drives the sliding member 330 to slide.

[0082] In this embodiment, the roller assembly 320 includes two transmission wheels, which are connected by a transmission belt 327, and the connecting member 310 connects the first transmission wheel 321 and the rotating member 120. The rotation speed of the second transmission wheel 322 is lower than the rotation speed of the first transmission wheel 321, so that the larger displacement of the rotating member 120 can be converted into the smaller displacement of the second transmission wheel 322, so that the larger height change of the lifting device 100 is converted into the smaller displacement of the sliding resistor assembly 400, thereby reducing the volume of the resistive height limiting device 200 and making it easier to measure the height of the lifting device 100. In other embodiments, the number and arrangement of transmission wheels that are considered appropriate by those skilled in the art can also be selected.

[0083] The first transmission wheel 321 includes a first outer ring 323 and a first inner ring 324 fixed at the center of the first outer ring 323, the radius of the first inner ring 324 is smaller than the radius of the first outer ring 323, and the second transmission wheel 322 includes a second outer ring 325 and a second inner ring 326 fixed at the center of the first outer ring 323, the radius of the second inner ring 326 is smaller than the radius of the second outer ring 325. The connecting member 310 is connected to the first outer ring 323, the connecting member 310 drives the first outer ring 323 to rotate, the transmission belt 327 connects the first inner ring 324 and the second outer ring 325, and the sliding member 330 is slidably connected to the second inner ring 326.

[0084] The connecting member 310 is connected to the first outer ring 323, and the transmission belt 327 is connected to the first inner ring 324. When the connecting member 310 drives the first outer ring 323 to rotate, the first inner ring 324 will also rotate synchronously. Since the radius of the first inner ring 324 is smaller than the radius of the first outer ring 323, when rotating at the same angle, the circumferential displacement of the first inner ring 324 is smaller than the circumferential displacement of the first outer ring 323, that is, the moving distance of the transmission belt 327 is smaller than the moving distance of the rotating member 120. The transmission belt 327 is also connected to the second outer ring 325. The transmission belt 327 drives the second outer ring 325 to move, so that the circumferential displacement of the first inner ring 324 can be converted into the circumferential displacement of the second outer ring 325. Since the radius of the second inner ring 326 is smaller than the radius of the second outer ring 325, when rotating at the same angle, the circumferential displacement of the second inner ring 326 is smaller than the circumferential displacement of the second inner ring 326, which further reduces the displacement size. The second inner ring 326 is connected to the sliding member 330 , thereby converting a larger displacement of the connecting member 310 into a smaller displacement of the sliding member 330 .

[0085] In this embodiment, the second inner ring 326 is a gear 610, and a rack 620 is provided on one side of the sliding member 330, and the rack 620 is meshed with the gear 610. When the gear 610 rotates, the gear 610 drives the rack 620 meshed with the gear 610 to move, thereby achieving the displacement of the sliding member 330. In other embodiments, other structures considered appropriate by those skilled in the art may also be provided to achieve the sliding of the sliding member 330 relative to the second inner ring 326.

[0086] The resistive height limiting device 200 also includes an alarm device 500, which can sound an alarm according to the resistance of the sliding resistor component 400. The alarm device 500 is connected to the wire 420. When the resistance of the sliding resistor component 400 reaches a certain warning value, it means that the height of the lifting device 100 reaches the warning position. At this time, the alarm device 500 can sound an alarm to remind the operator to pay attention to the height of the lifting device 100, thereby ensuring safety during the lifting process.

[0087] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A resistive height limiting device, the resistive height limiting device is used for a hoisting device, the hoisting device can be extended and / or swung, characterized in that: The resistive height limiting device comprises a displacement conversion device and a sliding resistance component; One end of the displacement conversion device is connected to the lifting device, and the other end of the displacement conversion device is connected to the sliding resistor assembly. The displacement conversion device can convert the height of the lifting device into the displacement of the sliding resistor assembly to change the resistance of the sliding resistor assembly and obtain the height of the lifting device.

2. The resistive height limiting device according to claim 1, characterized in that: The sliding resistor assembly includes a resistor body, a wire and a sliding resistor contact pin; The sliding resistor contact pin contacts the resistor body, and the displacement conversion device can drive the sliding resistor contact pin to slide along the resistor body to change the resistance of the resistor body. One end of the wire is connected to the resistor body, and the other end of the wire is connected to the sliding resistor contact pin.

3. The resistive height limiting device according to claim 2, characterized in that: The sliding resistor assembly also includes a support frame, on which a slide groove is provided, and the sliding resistor contact pin can slide along the slide groove.

4. The resistive height limiting device according to claim 3, characterized in that: The displacement conversion device comprises a sliding member, the sliding member is connected to the resistor body, the resistor body extends in a vertical direction, the slide groove extends in a horizontal direction, and the sliding member is always kept parallel to the telescopic direction of the lifting device; And / or, the displacement conversion device further includes a limiter, and the limiter can limit the extending direction of the sliding member to always remain parallel to the telescopic direction of the lifting device.

5. The resistive height limiting device according to claim 4, characterized in that: The sliding resistor assembly also includes a weight component, and the weight component is suspended at the lower end of the resistor body.

6. The resistive height limiting device according to claim 1, characterized in that: The displacement conversion device includes a connecting member, a roller assembly and a sliding member, and the lifting device includes a support and a rotating member, the lower end of the rotating member is rotatably connected to the support, and the rotating member can be extended and retracted along its own extension direction; The roller assembly is arranged on the support, one end of the connecting member is connected to the rotating member, the other end of the connecting member is connected to the roller assembly, the sliding member is connected to the roller assembly, the roller assembly drives the sliding member to move, and the sliding member drives the sliding resistor assembly to move.

7. The resistive height limiting device according to claim 6, characterized in that: The roller assembly comprises a first transmission wheel, a second transmission wheel and a transmission belt; The connecting member is connected to the first transmission wheel, the transmission belt connects the first transmission wheel and the second transmission wheel, the rotation speed of the second transmission wheel is lower than the rotation speed of the first transmission wheel, and the second transmission wheel drives the sliding member to slide.

8. The resistive height limiting device according to claim 7, characterized in that: The first transmission wheel comprises a first outer ring and a first inner ring fixed at the center of the first outer ring, the radius of the first inner ring is smaller than the radius of the first outer ring, and the second transmission wheel comprises a second outer ring and a second inner ring fixed at the center of the first outer ring, the radius of the second inner ring is smaller than the radius of the second outer ring; The connecting member is connected to the first outer ring, the connecting member drives the first outer ring to rotate, the transmission belt connects the first inner ring and the second outer ring, and the sliding member is slidably connected to the second inner ring; And / or, the second inner ring is a gear, a rack is provided on one side of the sliding member, and the rack is meshed with the gear.

9. The resistive height limiting device according to claim 1, characterized in that: The resistive height limiting device also includes an alarm device, which can issue an alarm according to the resistance of the sliding resistor component.

10. A crane, characterized in that: The crane comprises the hoisting device and the resistive height limiting device as described in any one of claims 1-9.

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