Hydraulic height limiting device and crane

Abstract

The invention discloses a hydraulic height limiting device and a crane, and relates to the technical field of cranes. The hydraulic type height limiting device is used for the hoisting device, the hoisting device can stretch out and draw back and / or swing, and the hydraulic type height limiting device comprises a hollow pipe and a pressure sensor. The upper end of the hollow pipe is connected to the hoisting device, the lower end of the hollow pipe is connected with the pressure sensor, the hollow pipe is used for being filled with liquid, and due to the fact that the liquid pressure intensity is in direct proportion to the depth, when the height of the upper end of the hollow pipe changes, the liquid pressure intensity of the lower end of the hollow pipe changes. The pressure sensor is connected to the lower end of the hollow pipe and can measure the liquid pressure at the lower end of the hollow pipe, and then the height of the top end of the hoisting device is obtained according to the liquid pressure, so that an operator can obtain the height of the top end of the hoisting device in time and adjust the height of the hoisting device in time; and the top end of the hoisting device is prevented from touching other facilities in the hoisting process, so that the safety of the hoisting device is improved.

Description

Technical Field

[0001] The invention relates to the technical field of cranes, and in particular to a hydraulic 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 overcome the defect in the prior art that the boom height of a crane is difficult to accurately measure, and to provide a hydraulic height limiting device and a crane.

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

[0006] The present invention provides a hydraulic height limiting device, which is used for a hoisting device, and the hoisting device can be extended and / or swung, and the hydraulic height limiting device includes a hollow tube and a pressure sensor;

[0007] The upper end of the hollow tube is connected to the lifting device, and the lower end of the hollow tube is connected to the pressure sensor. The hollow tube is used to be filled with liquid inside. The pressure sensor can measure the liquid pressure at the lower end of the hollow tube to obtain the top height of the lifting device.

[0008] In this solution, the lifting device can be extended and / or swung, and the upper end of the hollow tube is connected to the lifting device, so that the lifting device can drive the upper end of the hollow tube to extend and / or swung, thereby changing the height of the upper end of the hollow tube. The interior of the hollow tube is filled with liquid. Since the liquid pressure is proportional to its depth, when the height of the upper end of the hollow tube changes, the liquid pressure at the lower end of the hollow tube will also change. The pressure sensor is connected to the lower end of the hollow tube and can measure the liquid pressure at the lower end of the hollow tube, and then obtain the height of the top of the lifting device according to the liquid pressure. The height measurement of the lifting device is more accurate, thereby avoiding the top of the lifting device from touching other facilities during the lifting process, thereby improving the safety of the lifting device.

[0009] Preferably, the upper end of the hollow tube is in communication with the outside, and a dry-wet sensor is provided at the upper end of the hollow tube, and the dry-wet sensor is used to determine whether the liquid level of the liquid reaches the upper end of the hollow tube.

[0010] In this scheme, in order to ensure that the height of the top of the lifting device can be accurately measured, the liquid level must be kept at the top of the hollow tube at all times. The upper end of the hollow tube is connected to the outside world, and excess liquid can overflow from the upper end of the hollow tube. A dry-wet sensor is provided at the upper end of the hollow tube. The dry-wet sensor is used to determine whether the liquid level has reached the top of the hollow tube, and the liquid level is adjusted according to the information transmitted by the dry-wet sensor, so that the liquid level is always located at the top of the hollow tube, thereby ensuring the accuracy of the measurement.

[0011] Preferably, the dry-wet sensor comprises a liquid storage tank and a sensing circuit, the upper end of the hollow tube is connected to the interior of the liquid storage tank, the upper end of the liquid storage tank is provided with an opening connecting the interior of the liquid storage tank and the outside, and the sensing circuit comprises a sensing element, and the sensing element is provided inside the liquid storage tank;

[0012] When the liquid level in the liquid storage tank submerges the sensor, the sensing circuit is connected; when the liquid level in the liquid storage tank does not submerge the sensor, the sensing circuit is disconnected.

[0013] In this solution, the upper end of the hollow tube is connected to the interior of the liquid storage tank. When the liquid level reaches the top of the hollow tube, the liquid will flow into the liquid storage tank. The upper end of the liquid storage tank is provided with an opening connecting the interior of the liquid storage tank and the outside, so that excess liquid can flow out from the opening. A sensor is provided inside the liquid storage tank. When the liquid level in the liquid storage tank submerges the sensor, the sensing circuit is connected. When the liquid level in the liquid storage tank does not submerge the sensor, the sensing circuit is disconnected. Therefore, it is possible to judge whether the liquid level is at the top of the hollow tube by connecting or disconnecting the sensing circuit, thereby ensuring the accuracy of the measurement.

[0014] Preferably, the liquid is a conductor, the sensing circuit further comprises a wire, the sensing element comprises an insulator and connection points arranged at both ends of the insulator, and the connection points at both ends of the insulator are respectively connected to both ends of the wire.

[0015] In this solution, the sensing circuit is cut off or connected through the sensing element, which includes an insulator and connection points at both ends of the insulator, and the two ends of the wire are connected to the connection points at both ends of the insulator. When the liquid level in the liquid storage tank does not submerge the sensing element, the insulator cannot conduct electricity, so the sensing circuit is cut off. When the liquid level in the liquid storage tank submerges the sensing element, the connection point contacts the liquid because the liquid is a conductor, so that the sensing circuit is turned on.

[0016] Preferably, the wet / dry sensor further comprises a hanging portion, one end of which is fixed to the inner wall surface of the liquid storage tank, and the other end of which is connected to the sensing element.

[0017] In this solution, the sensor is suspended inside the liquid storage tank through the suspension part, so that the sensor can be suspended inside the liquid storage tank, which makes it easier for liquid level changes to act on the sensor and makes the sensor detect dryness and wetness more accurately.

[0018] Preferably, the induction circuit is further provided with a signal light, which lights up when the induction circuit is connected, and turns off when the induction circuit is disconnected.

[0019] In this solution, the signal light can convey information more intuitively. When the liquid level submerges the sensor, the induction circuit is connected, and the signal light is on, indicating that the liquid level has reached the top of the hollow tube. When the liquid level in the liquid storage tank does not submerge the sensor, the induction circuit is cut off, indicating that the liquid level is not high enough, and the pressure needs to be increased so that the liquid level can reach the top of the hollow tube, thereby ensuring the accuracy of the measurement.

[0020] Preferably, the hydraulic height limiting device further comprises a pipe wheel, and the lower end of the hollow pipe is wound around the pipe wheel;

[0021] When the hoisting device is extended, the hollow pipe pulls the pipe wheel to rotate the hollow pipe wound around the pipe wheel; when the hoisting device is shortened, the pipe wheel can rotate to rewind the lower end of the hollow pipe around the pipe wheel.

[0022] In this solution, the pipe wheel is used to accommodate the hollow pipe at the lower end. When the lifting device is extended, the hollow pipe wrapped around the pipe wheel will be pulled out, ensuring the length of the hollow pipe. When the lifting device is shortened, the pipe wheel can be rotated to rewrap the lower end of the hollow pipe around the pipe wheel, thereby avoiding the impact caused by the arbitrary placement of the overly long pipe wheel.

[0023] Preferably, the hoisting 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;

[0024] The pipe wheel is fixed on the support, and the upper end of the hollow pipe is fixed on the upper end of the rotating member.

[0025] In this solution, the lifting 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 rotate around the support, and the rotating member can be extended and retracted along its own extension direction, so that the lifting device has both rotation and extension functions. The pipe wheel is fixed on the support, and the upper end of the hollow tube is fixed to the upper end of the rotating member. When the rotating member is extended and retracted, the lower end of the hollow tube is fixed, and the upper end is extended along with the rotating member, so that the hollow tube wound in the pipe wheel can be pulled out to achieve the change of the length of the hollow tube.

[0026] Preferably, the hydraulic height limiting device further comprises a box, the lower end of the hollow tube is connected to the box, and the box is used to store the liquid.

[0027] In this solution, the box is used to store liquid. When the hollow tube is extended, the liquid in the box can be transported into the hollow tube. When the hollow tube is shortened, the liquid in the hollow tube can be discharged from the box, thereby ensuring that the liquid can always reach the top of the hollow tube. The box is provided to store liquid, which makes liquid level adjustment more convenient and ensures measurement accuracy.

[0028] The present invention also provides a crane, comprising the hoisting device and the above-mentioned hydraulic height limiting device.

[0029] In this solution, the crane has the same effect as the above-mentioned hydraulic height limiting device.

[0030] The positive and progressive effects of the present invention are:

[0031] The lifting device can be extended and / or swung, and the upper end of the hollow tube is connected to the lifting device, so that the lifting device can drive the upper end of the hollow tube to extend and / or swung, thereby changing the height of the upper end of the hollow tube. The interior of the hollow tube is filled with liquid. Since the liquid pressure is proportional to its depth, when the height of the upper end of the hollow tube changes, the liquid pressure at the lower end of the hollow tube will also change. The pressure sensor is connected to the lower end of the hollow tube and can measure the liquid pressure at the lower end of the hollow tube, thereby obtaining the height of the top of the lifting device according to the liquid pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 FIG. 4 is a side view of a crane according to an embodiment of the present invention.

[0033] Figure 2Schematic diagram of the structure of a dry-wet sensor according to an embodiment of the present invention.

[0034] Description of reference numerals:

[0035] Crane 100

[0036] Lifting device 200

[0037] Support 210

[0038] Rotating member 220

[0039] Hydraulic height limit device 300

[0040] Hollow tube 310

[0041] Pressure Sensor 320

[0042] Pipeline 330

[0043] Box 340

[0044] Signal line 350

[0045] Wet and dry sensor 400

[0046] Liquid storage tank 410

[0047] Opening 411

[0048] Induction circuit 420

[0049] Sensor 421

[0050] Insulator 422

[0051] Connection point 423

[0052] Signal light 424

[0053] Wire 425

[0054] Suspension unit 430 DETAILED DESCRIPTION

[0055] 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.

[0056] like Figure 1 As shown, this embodiment provides a crane 100 , which includes a hoisting device 200 and a hydraulic height limiting device 300 .

[0057] The hydraulic height limiting device 300 is used for the hoisting device 200, and the hoisting device 200 can be extended and / or swung. In this embodiment, the hoisting device 200 includes a support 210 and a rotating member 220, and the lower end of the rotating member 220 is rotatably connected to the support 210, so that the rotating member 220 can rotate around the support 210, and the rotating member 220 can be extended and retracted along its own extension direction, so that the hoisting device 200 has both rotation and extension functions. In other embodiments, other specific structures of the hoisting device 200 that are considered appropriate by those skilled in the art can also be selected.

[0058] The hydraulic height limiting device 300 includes a hollow tube 310 and a pressure sensor 320. The upper end of the hollow tube 310 is connected to the hoisting device 200, and the lower end of the hollow tube 310 is connected to the pressure sensor 320. The hollow tube 310 is used to be filled with liquid inside. The pressure sensor 320 can measure the liquid pressure at the lower end of the hollow tube 310 to obtain the top height of the hoisting device 200. The pressure sensor 320 is connected to the cab through a signal line 350, so that the height information of the hoisting device 200 can be transmitted to the driver so that the driver can make corresponding adjustments.

[0059] The hoisting device 200 can be extended and / or swung, and the upper end of the hollow tube 310 is connected to the hoisting device 200, so that the hoisting device 200 can drive the upper end of the hollow tube 310 to extend and / or swung, thereby changing the height of the upper end of the hollow tube 310. The interior of the hollow tube 310 is filled with liquid. Since the liquid pressure is proportional to its depth, when the height of the upper end of the hollow tube 310 changes, the liquid pressure at the lower end of the hollow tube 310 will also change. The pressure sensor 320 is connected to the lower end of the hollow tube 310 and can measure the liquid pressure at the lower end of the hollow tube 310, and then obtain the height of the top of the hoisting device 200 according to the liquid pressure. The height measurement of the hoisting device 200 is more accurate, thereby preventing the top of the hoisting device 200 from touching other facilities during the hoisting process, thereby improving the safety of the hoisting device 200.

[0060] The hydraulic height limiting device 300 can be attached to the crane 100. If the crane 100 itself is not equipped with a height measuring device, the hydraulic height limiting device 300 can accurately measure the hoisting device 200 in real time and give an early warning when the height limit is reached. If the crane 100 itself is equipped with a height measuring device, the hydraulic height limiting device 300 can be used to verify the height measuring device of the crane itself, thereby ensuring the accuracy of the height measurement.

[0061] In this embodiment, the upper end of the hollow tube 310 is connected to the top of the hanging device 200, so that the top height of the hanging device 200 can be more accurately obtained. In other embodiments, the upper end of the hollow tube 310 can also be connected to other positions of the hanging device 200, and the hanging device 200 can also drive the hollow tube 310 to move to obtain the top height of the hanging device 200.

[0062] In order to ensure that the height of the top of the lifting device 200 can be accurately measured, the liquid level must be kept at the top of the hollow tube 310 at all times. The upper end of the hollow tube 310 is connected to the outside world, and excess liquid can overflow from the upper end of the hollow tube 310. A wet-dry sensor 400 is provided at the upper end of the hollow tube 310. The wet-dry sensor 400 is used to determine whether the liquid level has reached the top of the hollow tube 310, thereby adjusting the liquid level based on the information transmitted by the wet-dry sensor 400 so that the liquid level is always at the top of the hollow tube 310, thereby ensuring the accuracy of the measurement.

[0063] like Figure 2 As shown, the wet-dry sensor 400 includes a liquid storage tank 410 and a sensing circuit 420. The upper end of the hollow tube 310 is connected to the interior of the liquid storage tank 410. When the liquid level reaches the top of the hollow tube 310, the liquid will flow into the liquid storage tank 410. The upper end of the liquid storage tank 410 is provided with an opening 411 connecting the interior of the liquid storage tank 410 and the outside, so that excess liquid can flow out from the opening 411 to avoid excessive pressure in the hollow tube 310.

[0064] The sensing circuit 420 includes a sensing element 421, which is disposed inside the liquid storage tank 410. When the liquid level in the liquid storage tank 410 submerges the sensing element 421, the sensing circuit 420 is connected; when the liquid level in the liquid storage tank 410 does not submerge the sensing element 421, the sensing circuit 420 is disconnected, so that the connection or disconnection of the sensing circuit 420 can be used to determine whether the liquid level is at the top of the hollow tube 310, thereby ensuring the accuracy of the measurement.

[0065] The sensing circuit 420 is cut off or connected through the sensing element 421. The liquid is a conductor. The sensing circuit 420 also includes a wire 425. The sensing element 421 includes an insulator 422 and connection points 423 provided at both ends of the insulator 422. The connection points 423 at both ends of the insulator 422 are respectively connected to both ends of the wire 425. When the liquid level in the liquid storage tank 410 does not submerge the sensing element 421, the insulator 422 cannot conduct electricity, so the sensing circuit 420 is cut off. When the liquid level in the liquid storage tank 410 submerges the sensing element 421, the connection point 423 contacts the liquid because the liquid is a conductor, so that the sensing circuit 420 is turned on.

[0066] In this embodiment, the liquid is water, which is conductive. In other embodiments, other conductive liquids considered appropriate by those skilled in the art may also be selected.

[0067] In this embodiment, the connection point 423 is two small metal balls. In other embodiments, other specific structures of the connection point 423 that are considered appropriate by those skilled in the art may also be selected.

[0068] The dry and wet sensor 400 further includes a hanging part 430, one end of which is fixed to the inner wall surface of the liquid storage tank 410, and the other end of which is connected to the sensor 421. The sensor 421 is hung inside the liquid storage tank 410 through the hanging part 430. The sensor 421 itself has a certain weight, so that the sensor 421 can be suspended inside the liquid storage tank 410, which makes it easier for the liquid level change to act on the sensor 421, so that the sensor 421 can detect dryness and wetness more accurately.

[0069] In this embodiment, the dry and wet sensor 400 is suspended inside the liquid storage bin 410. In other embodiments, the sensor 421 may also be directly fixed to the inner wall surface of the liquid storage bin 410, or other fixing positions and methods of the sensor 421 deemed appropriate by those skilled in the art may be selected.

[0070] The sensing circuit 420 is also provided with a signal light 424. When the sensing circuit 420 is connected, the signal light 424 is lit, and when the sensing circuit 420 is disconnected, the signal light 424 is off. The signal light 424 can convey information more intuitively. When the liquid level submerges the sensing element 421, the sensing circuit 420 is connected, and the signal light 424 is lit, indicating that the liquid level has reached the top of the hollow tube 310. When the liquid level in the liquid storage tank 410 does not submerge the sensing element 421, the sensing circuit 420 is disconnected, indicating that the liquid level is not high enough, and the pressure needs to be increased so that the liquid level can reach the top of the hollow tube 310, thereby ensuring the accuracy of the measurement.

[0071] In this embodiment, a signal light 424 is provided to indicate whether the liquid level has reached the top of the hollow tube 310. In other embodiments, a sounding device may be provided to indicate the liquid level, or other devices deemed appropriate by those skilled in the art may be selected to reflect the liquid level.

[0072] The hydraulic height limiting device 300 further includes a pipe wheel 330, and the lower end of the hollow tube 310 is wound around the pipe wheel 330. When the hoisting device 200 is extended, the hollow tube 310 pulls the pipe wheel 330, so that the hollow tube 310 wound around the pipe wheel 330 is turned out, that is, the hollow tube 310 wound around the pipe wheel 330 is pulled out, thereby ensuring the length of the hollow tube 310. When the hoisting device 200 is shortened, the pipe wheel 330 can be rotated to rewind the lower end of the hollow tube 310 around the pipe wheel 330, thereby avoiding the influence caused by the arbitrary placement of the overly long pipe wheel 330.

[0073] The pipe wheel 330 is fixed on the support 210, and the upper end of the hollow tube 310 is fixed to the upper end of the rotating member 220. When the rotating member 220 is extended or retracted, the lower end of the hollow tube 310 is fixed, and the upper end is extended along with the rotating member 220, so that the hollow tube 310 wound in the pipe wheel 330 can be pulled out to change the length of the hollow tube 310.

[0074] The hydraulic height limiting device 300 further includes a box 340, and the lower end of the hollow tube 310 is connected to the box 340, and the box 340 is used to store liquid. When the hollow tube 310 is extended, the liquid in the box 340 can be transported into the hollow tube 310, and when the hollow tube 310 is shortened, the liquid in the hollow tube 310 can be discharged from the box 340, thereby ensuring that the liquid can always reach the top of the hollow tube 310. The box 340 is provided to store liquid, making it more convenient to adjust the liquid level and ensuring the accuracy of the measurement.

[0075] 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 hydraulic height limiting device, the hydraulic height limiting device is used for a lifting device, the lifting device can be extended and / or swung, characterized in that: The hydraulic height limiting device includes a hollow tube and a pressure sensor; The upper end of the hollow tube is connected to the lifting device, and the lower end of the hollow tube is connected to the pressure sensor. The hollow tube is used to be filled with liquid inside. The pressure sensor can measure the liquid pressure at the lower end of the hollow tube to obtain the top height of the lifting device.

2. The hydraulic height limiting device according to claim 1, characterized in that: The upper end of the hollow tube is in communication with the outside world. A dry-wet sensor is provided at the upper end of the hollow tube. The dry-wet sensor is used to determine whether the liquid level of the liquid reaches the upper end of the hollow tube.

3. The hydraulic height limiting device according to claim 2, characterized in that: The dry-wet sensor includes a liquid storage tank and a sensing circuit, the upper end of the hollow tube is connected to the interior of the liquid storage tank, the upper end of the liquid storage tank is provided with an opening connecting the interior of the liquid storage tank and the outside, and the sensing circuit includes a sensing element, and the sensing element is provided inside the liquid storage tank; When the liquid level in the liquid storage tank submerges the sensor, the sensing circuit is connected; when the liquid level in the liquid storage tank does not submerge the sensor, the sensing circuit is disconnected.

4. The hydraulic height limiting device according to claim 3, characterized in that: The liquid is a conductor, the induction circuit further includes a wire, the sensor element includes an insulator and connection points arranged at both ends of the insulator, and the connection points at both ends of the insulator are respectively connected to both ends of the wire.

5. The hydraulic height limiting device according to claim 3, characterized in that: The dry-wet sensor also includes a hanging part, one end of which is fixed to the inner wall surface of the liquid storage tank, and the other end of which is connected to the sensor element.

6. The hydraulic height limiting device according to claim 3, characterized in that: The induction circuit is also provided with a signal light, which lights up when the induction circuit is connected, and turns off when the induction circuit is disconnected.

7. The hydraulic height limiting device according to claim 1, characterized in that: The hydraulic height limiting device further comprises a pipe wheel, and the lower end of the hollow pipe is wound around the pipe wheel; When the hoisting device is extended, the hollow pipe pulls the pipe wheel to rotate the hollow pipe wound around the pipe wheel; when the hoisting device is shortened, the pipe wheel can rotate to rewind the lower end of the hollow pipe around the pipe wheel.

8. The hydraulic height limiting device according to claim 7, characterized in that: 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; The pipe wheel is fixed on the support, and the upper end of the hollow pipe is fixed on the upper end of the rotating member.

9. The hydraulic height limiting device according to claim 1, characterized in that: The hydraulic height limiting device further comprises a box body, the lower end of the hollow tube is connected to the box body, and the box body is used to store the liquid.

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

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