Hydraulic hoist for hoisting, dismounting and mounting coal mine equipment

Abstract

The invention relates to the field of hydraulic hoists, and discloses a hydraulic hoist for hoisting, dismounting and mounting coal mine equipment, which comprises a hydraulic hoist body and a hydraulic motor for driving the hydraulic hoist body, and the hydraulic motor is connected with a hydraulic buffer to protect the hydraulic motor at the moment of unloading of the hydraulic hoist body. The hydraulic buffer comprises a shell, a first elastic pressure relief mechanism, a top impact mechanism and a second elastic pressure relief mechanism, and has the beneficial effects that the whole pressure relief process can be rapidly completed, most hydraulic oil can be contained through a first channel and a second channel, most impact pressure in a system is absorbed, and the service life of the system is prolonged. And the influence of hydraulic impact on the hydraulic motor and the whole hydraulic system is prevented.

Description

Technical Field

[0001] The invention relates to the field of hydraulic hoists, and in particular to a hydraulic hoist for lifting, disassembling and assembling coal mine equipment. Background Art

[0002] Hydraulic hoists for coal mines are mainly used for lifting operations underground in coal mines, such as lifting heavy objects, handling equipment, installation and disassembly, etc. At the same time, it can also be used in other places that require explosion-proof and heavy-load lifting operations, such as chemical, petroleum, metallurgy and other fields.

[0003] The main driving element of the hydraulic hoist used in coal mines is the hydraulic motor. The hydraulic hoist uses hydraulic oil as the power to drive the hydraulic motor to rotate, and completes the lifting work after the torque is increased by the gearbox (reducer). Specifically, when the hydraulic circuit is opened, high-pressure oil is sent to the hydraulic motor to make its gears rotate at high speed, thereby driving the entire lifting mechanism to work.

[0004] During the operation of the existing hydraulic hoist, specifically when the hydraulic hoist releases the suspended weight, the pressure in the hydraulic circuit will suddenly change, which will produce an instantaneous impact force (called hydraulic shock) on the hydraulic oil. This impact force will be transmitted to the hydraulic motor through the hydraulic system, and the hydraulic shock will have an adverse effect on the seals, pipelines and valves of the hydraulic motor and the entire hydraulic system.

[0005] Although existing relief valves can help control overpressure in hydraulic systems and prevent damage to hydraulic motors caused by the hydraulic impact force generated by loosening heavy objects, traditional relief valves have their designed maximum flow capacity. When the hydraulic system is working normally, the relief valve can discharge excess hydraulic oil as needed. However, at the moment of hydraulic impact, the system pressure will increase very quickly, which may far exceed the flow handling capacity of the relief valve, resulting in the inability to fully absorb the impact pressure in the system. Summary of the invention

[0006] The purpose of this application is to provide a hydraulic hoist for lifting, disassembling and assembling coal mine equipment to solve the above problems. The specific technical solution is as follows:

[0007] A hydraulic hoist for lifting, disassembling and assembling coal mine equipment comprises a hydraulic hoist body and a hydraulic motor for driving the hydraulic hoist body, the hydraulic motor is connected to a hydraulic buffer to protect the hydraulic motor at the moment of unloading the hydraulic hoist body, the hydraulic buffer comprises a shell, a first elastic pressure relief mechanism, a top punch mechanism and a second elastic pressure relief mechanism, the shell is connected to the hydraulic motor, the shell is provided with a receiving space for installing the second elastic pressure relief mechanism, the shell is provided with a first channel and a second channel for connecting the internal oil chamber of the hydraulic motor, the first channel and the second channel are respectively connected to the receiving space, the first elastic pressure relief mechanism and the top punch mechanism are arranged in the first channel, the first elastic pressure relief mechanism, the top punch mechanism and the second elastic pressure relief mechanism are arranged in sequence from front to back, the outlet of the first channel is blocked by the first elastic pressure relief mechanism, and the outlet of the second channel is blocked by the second elastic pressure relief mechanism.

[0008] Preferably, the first elastic pressure relief mechanism includes a first pressure relief rod, a first spring and a fixing ring, the two ends of the first pressure relief rod are respectively connected to a first block and a second block, the first block is larger in volume than the second block, the fixing ring is fixedly connected in the first channel, the first pressure relief rod and the second block can pass through the fixing ring, the first spring is sleeved on the first pressure relief rod, one end of the first spring is connected to the first block, and the other end of the first spring is connected to the fixing ring.

[0009] Preferably, the front half of the first channel is used to accommodate the first elastic pressure relief mechanism, and the front half of the first channel is connected to the internal oil chamber of the hydraulic motor, and the rear half of the first channel is used to accommodate the punching mechanism, and the rear half of the first channel is connected to the accommodating space.

[0010] Preferably, the punching mechanism includes a magnet and a plurality of balls, two spaced-apart limit blocks are provided on the inner wall of the first channel, the magnet is slidably arranged between the two limit blocks, a plurality of balls and a fixing ring are arranged on opposite sides of the magnet, a plurality of balls are linearly arranged along the length direction of the first channel, and the first ball among the plurality of balls arranged linearly abuts against the magnet and is adsorbed by the magnet.

[0011] Preferably, the punching mechanism further comprises a coil, and the coil is arranged between the ball and the second elastic pressure relief mechanism, and the ball can pass through between the coils.

[0012] Preferably, a slide groove is provided on the inner wall of the first channel, and the ball is arranged in the slide groove.

[0013] Preferably, the second elastic pressure relief mechanism includes a second spring, a second pressure relief rod and a pressure plate, the pressure plate is arranged in the accommodating space, one end of the second spring is connected to the pressure plate, and the other end of the second spring is connected to the bottom surface of the accommodating space, the second spring is in an elastic energy storage state, the second pressure relief rod is arranged in the second channel, and the second pressure relief rod is connected to the pressure plate.

[0014] Preferably, the second elastic pressure relief mechanism further includes a silicone end cap, the silicone end cap is connected to the second pressure relief rod, and the silicone end cap covers the outlet of the second channel.

[0015] Preferably, the cross-section of the silicone end cap is T-shaped.

[0016] Preferably, the first elastic pressure relief mechanism further includes a silicone ring, and the silicone ring is sleeved on the outer side of the first blocking block.

[0017] The beneficial effects of the present application are as follows: by arranging a first elastic pressure relief mechanism in the first channel, it is ensured that at the moment of hydraulic shock, the first elastic pressure relief mechanism can elastically contract to absorb part of the shock pressure; secondly, when the first elastic pressure relief mechanism contracts, the outlet of the first channel will be opened, and at this time, the first channel can accommodate the hydraulic oil discharged from the oil chamber of the hydraulic motor, and during the process of contraction or retreat, the first elastic pressure relief mechanism will trigger the top punch mechanism and accelerate the top punch mechanism and then hit the second elastic pressure relief mechanism to contract the second elastic pressure relief mechanism, thereby opening the second channel to complete the pressure relief, and the entire pressure relief process can be completed quickly, and the first channel and the second channel can be used to accommodate most of the hydraulic oil and absorb most of the shock pressure in the system, thereby preventing the hydraulic shock from affecting the hydraulic motor and the entire hydraulic system, and playing a protective role.

[0018] Additional aspects and advantages of the present invention will be given in part in the description below, and in part will become apparent from the description below, or will be understood through the practice of the present invention. Of course, it is not necessary to achieve all of the advantages described above at the same time to implement any product or method of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 It is a structural schematic diagram of the present invention.

[0021] Figure 2It is a structural schematic diagram of the hydraulic buffer of the present invention.

[0022] Figure 3 It is another structural schematic diagram of the hydraulic buffer of the present invention.

[0023] In the figure: a hydraulic hoist body 1; a hydraulic motor 2; a hydraulic buffer 3; a first elastic pressure relief mechanism 31; a punching mechanism 32; a second elastic pressure relief mechanism 33; a housing 34; an accommodating space 35; a first channel 36; a second channel 37; a first pressure relief rod 311; a first spring 312; a first blocking block 313; a second blocking block 314; a fixing ring 315; a magnet 321; a ball 322; a limit block 323; a slide groove 324; a coil 325; a second pressure relief rod 331; a second spring 332; a silicone end cover 333; and a pressure plate 334. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0026] The existing relief valves have their designed maximum flow capacity. When the hydraulic system is working normally, the relief valve can discharge excess hydraulic oil as needed. However, at the moment of hydraulic shock, the system pressure will increase very quickly, which may far exceed the flow processing capacity of the relief valve, resulting in the problem of being unable to fully absorb the shock pressure in the system.

[0027] See also Figure 1-3The present invention provides an embodiment to solve the above technical problems, specifically comprising a hydraulic hoist body 1 and a hydraulic motor 2 for driving the hydraulic hoist body 1, the hydraulic motor 2 is connected to a hydraulic buffer 3 to protect the hydraulic motor 2 at the moment of unloading the hydraulic hoist body 1, the hydraulic buffer 3 comprises a housing 34, a first elastic pressure relief mechanism 31, a top punching mechanism 32 and a second elastic pressure relief mechanism 33, the housing 34 is connected to the housing 34, the housing 34 is provided with a receiving space 35 for installing the second elastic pressure relief mechanism 33, and the housing 34 is provided with a first channel 36 and a second channel 37 for communicating with the internal oil chamber of the hydraulic motor 2, The first channel 36 and the second channel 37 are communicated with the accommodating space 35 respectively. The first elastic pressure relief mechanism 31 and the top punch mechanism 32 are arranged in the first channel 36. The first elastic pressure relief mechanism 31, the top punch mechanism 32 and the second elastic pressure relief mechanism 33 are arranged in sequence from front to back. The outlet of the first channel 36 is blocked by the first elastic pressure relief mechanism 31, and the outlet of the second channel 37 is blocked by the second elastic pressure relief mechanism 33. In this embodiment, by arranging the first elastic pressure relief mechanism 31 in the first channel 36, it is ensured that at the moment when the hydraulic shock occurs, the first elastic pressure relief mechanism 31 can be elastically contracted to absorb part of the shock pressure.

[0028] Secondly, when the first elastic pressure relief mechanism 31 contracts, the outlet of the first channel 36 will be opened, and the first channel 36 can receive the hydraulic oil discharged from the oil chamber of the hydraulic motor 2;

[0029] Based on the above embodiment, the first elastic pressure relief mechanism 31 cooperates with the first channel 36 to absorb only a small part of the impact pressure in the system. Therefore, it is necessary to make further improvements to the hydraulic buffer 3:

[0030] In some embodiments, the front half of the first channel 36 is used to accommodate the first elastic pressure relief mechanism 31, and the front half of the first channel 36 is connected to the internal oil chamber of the hydraulic motor 2, and the rear half of the first channel 36 is used to accommodate the top punching mechanism 32, and the rear half of the first channel 36 is connected to the accommodating space 35;

[0031] Specifically, the first elastic pressure relief mechanism 31 includes a first pressure relief rod 311, a first spring 312 and a fixing ring 315. The first two ends of the first pressure relief rod 311 are respectively connected to a first block 313 and a second block 314. The first block 313 is larger in volume than the second block 314. The fixing ring 315 is fixedly connected to the first channel 36. The first pressure relief rod 311 and the second block 314 can pass through the fixing ring 315. The first spring 312 is sleeved on the first pressure relief rod 311, and one end of the first spring 312 is connected to the first block 313, and the other end of the first spring 312 is connected to the fixing ring 315.

[0032] The punching mechanism 32 includes a magnet 321 and a plurality of balls 322. Two spaced apart limit blocks 323 are provided on the inner wall of the first channel 36. The magnet 321 is slidably arranged between the two limit blocks 323. The plurality of balls 322 and the fixing ring 315 are arranged on opposite sides of the magnet 321. The plurality of balls 322 are linearly arranged along the length direction of the first channel 36. The first ball 322 of the linearly arranged plurality of balls 322 abuts against the magnet 321 and is adsorbed by the magnet 321. Preferably, a slide groove 324 is provided on the inner wall of the first channel 36. The ball 322 is arranged in the slide groove 324. Furthermore, the punching mechanism 32 also includes a coil 325. The coil 325 is arranged between the ball 322 and the second elastic pressure relief mechanism 33. The ball 322 can pass between the coil 325.

[0033] The second elastic pressure relief mechanism 33 includes a second spring 332, a second pressure relief rod 331 and a pressure plate 334. The pressure plate 334 is arranged in the accommodating space 35. One end of the second spring 332 is connected to the pressure plate 334, and the other end of the second spring 332 is connected to the bottom surface of the accommodating space 35. The second spring 332 is in an elastic energy storage state. The second pressure relief rod 331 is arranged in the second channel 37, and the second pressure relief rod 331 is connected to the pressure plate 334. The second spring 332 is a large spring. Under the default condition of the hydraulic hoist or in normal use, the hydraulic oil cannot squeeze the second spring 332 through the second pressure relief rod 331.

[0034] The working principles of the first elastic pressure relief mechanism 31, the punching mechanism 32 and the second elastic pressure relief mechanism 33 are as follows:

[0035] When the hydraulic hoist releases the suspended weight, it will generate an instantaneous impact force (called hydraulic impact) on the hydraulic oil. The hydraulic oil will directly act on the first block 313 of the first elastic pressure relief mechanism 31. The first block 313 retreats under the force of the hydraulic oil and opens the first channel 36. The hydraulic oil enters the first channel 36. It is worth mentioning that since the outer side of the first block 313 is sleeved with a silicone ring, the silicone ring and the first channel 36 have an interference fit, and it is difficult for the hydraulic oil to flow to the rear of the first block 313 through the silicone ring. In the process of retreating, the first block 313 will squeeze the first spring 312 and drive the second block 314 to retreat;

[0036] After retreating a certain distance, the second blocking block 314 will pass through the center of the fixing ring 315. It should be noted that the material of the second blocking block 314 is a metal that can be absorbed by the magnet 321. As the second blocking block 314 gradually approaches the magnet 321 of the punching mechanism 32, the second blocking block 314 will be attracted by the magnet 321. Under the attraction of the magnet 321, the second blocking block 314 will accelerate to approach the magnet 321 and finally collide with the magnet 321, and the magnet 321 will transfer the force of the second blocking block 314 to the ball 322 at the rear. It should be noted that the material of the ball 322 is a metal that can be absorbed by the magnet 321, and the number of the ball 322 is 2-3. Since the ball 322 at the end is least affected by the magnet 321, when the second blocking block 314 hits the magnet 321, the magnet The iron 321 will transfer the force of the second block 314 backward to the ball 322, and the ball 322 at the end will be ejected at high speed. When the ejected ball 322 passes through the energized coil 325, the magnetic field generated by the energized coil 325 will accelerate it. The accelerated ball 322 will hit the pressure plate 334 and make the pressure plate 334 retreat and squeeze the second spring 332. At this time, the second channel 37 will open to accommodate the hydraulic oil. After a short period of time, the second spring 332 will reset, and the second spring 332 will push the pressure plate 334 and drive the second pressure relief rod 331 to push the hydraulic oil in the second channel 37 back to the oil chamber. At the same time, the first spring 312 pushes the first pressure relief rod 311 to push the hydraulic oil in the first channel 36 back to the oil chamber, thereby absorbing most of the impact pressure in the system.

[0037] Preferably, the second elastic pressure relief mechanism 33 also includes a silicone end cover 333, which is connected to the second pressure relief rod 331, and the silicone end cover 333 covers the outlet of the second channel 37. Preferably, the silicone end cover 333 is T-shaped. By setting the T-shaped silicone end cover 333, the sealing effect of the silicone end cover 333 on the outlet of the second channel 37 can be improved.

[0038] It should be noted that the terms "first", "second", etc. in this document are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0039] The terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. in this document indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present application.

[0040] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A hydraulic hoist for lifting, disassembling and assembling coal mine equipment, characterized in that: It includes a hydraulic hoist body and a hydraulic motor for driving the hydraulic hoist body, the hydraulic motor is connected to a hydraulic buffer to protect the hydraulic motor at the moment of unloading the hydraulic hoist body, the hydraulic buffer includes a shell, a first elastic pressure relief mechanism, a top punch mechanism and a second elastic pressure relief mechanism, the shell is connected to the hydraulic motor, the shell is provided with a receiving space for installing the second elastic pressure relief mechanism, the shell is provided with a first channel and a second channel for connecting the internal oil chamber of the hydraulic motor, the first channel and the second channel are respectively connected with the receiving space, the first elastic pressure relief mechanism and the top punch mechanism are arranged in the first channel, the first elastic pressure relief mechanism, the top punch mechanism and the second elastic pressure relief mechanism are arranged in sequence from front to back, the outlet of the first channel is blocked by the first elastic pressure relief mechanism, and the outlet of the second channel is blocked by the second elastic pressure relief mechanism.

2. A hydraulic hoist for lifting and disassembling coal mine equipment according to claim 1, characterized in that: The first elastic pressure relief mechanism includes a first pressure relief rod, a first spring and a fixing ring. The two ends of the first pressure relief rod are respectively connected to a first block and a second block. The first block is larger in volume than the second block. The fixing ring is fixedly connected in the first channel. The first pressure relief rod and the second block can pass through the fixing ring. The first spring is sleeved on the first pressure relief rod, and one end of the first spring is connected to the first block, and the other end of the first spring is connected to the fixing ring.

3. A hydraulic hoist for lifting and disassembling coal mine equipment according to claim 2, characterized in that: The front half of the first channel is used to accommodate the first elastic pressure relief mechanism, and the front half of the first channel is connected to the internal oil chamber of the hydraulic motor. The rear half of the first channel is used to accommodate the top punching mechanism, and the rear half of the first channel is connected to the accommodating space.

4. A hydraulic hoist for lifting and disassembling coal mine equipment according to claim 3, characterized in that: The punching mechanism includes a magnet and a plurality of balls. Two spaced-apart limit blocks are provided on the inner wall of the first channel. The magnet is slidably arranged between the two limit blocks. The plurality of balls and a fixing ring are arranged on opposite sides of the magnet. The plurality of balls are linearly arranged along the length direction of the first channel. The first of the plurality of balls arranged linearly abuts against the magnet and is adsorbed by the magnet.

5. A hydraulic hoist for lifting, disassembling and assembling coal mine equipment according to claim 4, characterized in that: The punching mechanism further includes a coil, which is disposed between the ball and the second elastic pressure relief mechanism, and the ball can pass through between the coils.

6. A hydraulic hoist for lifting, disassembling and assembling coal mine equipment according to claim 5, characterized in that: A slide groove is provided on the inner wall of the first channel, and the ball is arranged in the slide groove.

7. A hydraulic hoist for lifting, disassembling and assembling coal mine equipment according to claim 6, characterized in that: The second elastic pressure relief mechanism includes a second spring, a second pressure relief rod and a pressure plate, the pressure plate is arranged in the accommodating space, one end of the second spring is connected to the pressure plate, and the other end of the second spring is connected to the bottom surface of the accommodating space, the second spring is in an elastic energy storage state, the second pressure relief rod is arranged in the second channel, and the second pressure relief rod is connected to the pressure plate.

8. The hydraulic hoist for lifting, disassembling and assembling coal mine equipment according to claim 7, characterized in that: The second elastic pressure relief mechanism further includes a silicone end cap, which is connected to the second pressure relief rod and covers the outlet of the second channel.

9. A hydraulic hoist for lifting, disassembling and assembling coal mine equipment according to claim 8, characterized in that: The silicone end cap is in a T-shape.

10. The hydraulic hoist for lifting, disassembling and assembling coal mine equipment according to claim 2, characterized in that: The first elastic pressure relief mechanism also includes a silicone ring, and the silicone ring is sleeved on the outer side of the first blocking block.

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