Buffer mechanism for European style crane electric trolley

Abstract

The utility model discloses a buffer mechanism for an electric trolley of a European-style crane, and relates to the technical field of cranes, in particular to the buffer mechanism for the electric trolley of the European-style crane, which comprises a buffer seat, a mounting plate is arranged at one end of the buffer seat, and a stepped hole is formed in the middle of the buffer seat. Buffer mounting holes are formed in the four corners of the buffer seat, sliding grooves are formed in the middles of the four side faces of the buffer seat, a slidable step shaft is inserted into the step hole, a floating plate is fixedly installed at one end of the step shaft through a screw, and the outer surface of the step shaft is sleeved with a compression spring. According to the buffer mechanism for the European-style crane electric trolley, the buffer seat, the floating plate, the magnetic sheet and the magnetorheological fluid buffer are arranged in a matched mode, so that the buffer mechanism for the European-style crane electric trolley has the effect that the buffer force can be automatically and gradually changed according to the impact force; the buffer mechanism for the European style crane electric trolley has the effect of facilitating the maintenance of the buffer.

Description

Technical Field

[0001] The utility model relates to the technical field of cranes, in particular to a buffer mechanism for an electric trolley of a European-style crane. Background Technique

[0002] The electric trolley of a European-style crane refers to an electric drive device that runs on the bridge of a European-style crane and is used to realize the horizontal handling of goods. It usually consists of components such as a motor, a reducer, wheels, a frame, a coupling, and a buffer mechanism. The buffer mechanism plays roles such as absorbing impact energy, reducing running noise, and ensuring running safety. Common buffer mechanisms include spring buffers, rubber buffers, polyurethane buffers, and hydraulic buffers. Among them, the hydraulic buffer used as a buffer device for a crane trolley has the following advantages:

[0003] Good buffering effect: It can provide a smooth and progressive buffering force.

[0004] Small rebound force: It will not have a greater reverse thrust as the buffer stroke increases like polyurethane, rubber, and springs. The reverse thrust will cause the trolley to rebound and vibrate, and then generate noise.

[0005] Strong adaptability: It can adjust the buffering force by adjusting the parameters of the hydraulic system according to the different running speeds, masses of the crane trolley, and the requirements of the actual working environment.

[0006] However, the traditional hydraulic buffer used as a buffer device for a crane trolley has some defects in the use process. On the one hand, although the hydraulic buffer can adjust the magnitude of the buffering force, it is only adjusted once during installation and cannot automatically adjust according to the impact force during the buffering process. If the buffering force is adjusted too large during installation, a large impact will be generated. If the buffering force is adjusted too small during installation, the energy cannot be fully absorbed, resulting in a hard impact. On the other hand, the existing oil pressure buffer is fixedly connected by threads, and a pair of wrenches are required to unscrew it during later careful maintenance and replacement, which is not very convenient. Content of the Utility Model

[0007] (I) Technical Problems to be Solved

[0008] In view of the deficiencies of the prior art, the utility model provides a buffer mechanism for an electric trolley of a European-style crane, which solves the problems put forward in the above background technique.

[0009] (II) Technical Solutions

[0010] To achieve the above object, the utility model is realized by the following technical solutions: A buffer mechanism for an electric trolley of an European crane, including a buffer seat, one end of the buffer seat is provided with a mounting plate, a stepped hole is opened in the middle of the buffer seat, buffer mounting holes are opened at the four corners of the buffer seat, sliding grooves are opened at the middle positions of the four sides of the buffer seat, a slidable stepped shaft is inserted into the stepped hole, one end of the stepped shaft is fixedly installed with a floating plate by screws, a compression spring is sleeved on the outer surface of the stepped shaft, a buffer groove is opened on the side of the floating plate away from the buffer seat, sliding rods inserted into the sliding grooves are arranged around the side of the floating plate close to the buffer seat, a polyurethane pad is fixedly installed in the buffer groove by screws, magnetic sheets are fixedly installed on the outer sides of the sliding rods by screws, and magnetorheological fluid shock absorbers are inserted into the buffer mounting holes.

[0011] Preferably, the mounting plate and the buffer seat are integrally processed or spliced by welding. Screw clearance holes are opened at the four corners of the mounting plate. The buffer seat is fixedly installed at the end of the electric trolley of the crane by the screw clearance holes in cooperation with screws.

[0012] Preferably, the middle diameter of the stepped hole is small and the diameters at both ends are large. The stepped shaft is in clearance fit with the small-diameter part in the middle of the stepped hole. The outer diameter of the end of the stepped shaft away from the floating plate is larger than the small-diameter part in the middle of the stepped hole but smaller than the large-diameter part at the end of the stepped hole.

[0013] Preferably, the compression spring is in a compressed state. One end of the compression spring is inserted into the stepped hole and the other end pushes the floating plate outwards.

[0014] Preferably, the inner diameter of the buffer mounting hole is larger than the outer diameter of the shell of the magnetorheological fluid shock absorber, the depth of the buffer mounting hole is greater than the length of the shell of the magnetorheological fluid shock absorber. A C-shaped broken-edge groove for inserting the magnetorheological fluid shock absorber from the outside is opened at one end of the buffer mounting hole close to the floating plate. The magnetorheological fluid shock absorber is inserted into the buffer mounting hole from the C-shaped broken-edge groove, and the telescopic rod of the magnetorheological fluid shock absorber abuts against the inner side of the floating plate.

[0015] Preferably, the thickness of the polyurethane pad is larger than the depth of the buffer groove. A through hole is opened in the middle of the polyurethane pad, and counterbore holes are opened at the four corners of the polyurethane pad.

[0016] Preferably, the outer surface of the sliding rod protrudes from the side of the buffer seat. The number of the magnetic sheets is several, and the magnetic sheet closest to the magnetorheological fluid shock absorber is flush with the end face of the shell of the magnetorheological fluid shock absorber.

[0017] The utility model provides a buffer mechanism for an electric trolley of an European crane, having the following beneficial effects:

[0018] 1. The buffer mechanism for the electric trolley of the European-style crane, through the cooperation of the buffer seat, floating plate, magnetic sheet and magnetorheological fluid buffer, enables the buffer mechanism for the electric trolley of the European-style crane to automatically and gradually change the buffer force according to the magnitude of the impact force. When a collision occurs, the greater the impact force, the longer the distance the telescopic rod of the magnetorheological fluid buffer is pushed back, and thus the greater the distance the floating plate moves towards the buffer seat side. As a result, more magnetic sheets approach the magnetorheological fluid buffer, and more magnetic forces act on the magnetorheological fluid inside the magnetorheological fluid buffer. Consequently, the fluidity of the magnetorheological fluid becomes worse, and the buffer force of the magnetorheological fluid buffer becomes greater, thereby enabling the buffer mechanism to achieve the effect of automatically and gradually changing the buffer force according to the magnitude of the impact force.

[0019] 2. The buffer mechanism for the electric trolley of the European-style crane, through the cooperation of the buffer seat and the floating plate, enables the buffer mechanism for the electric trolley of the European-style crane to have the effect of facilitating the maintenance of the buffer. Since the buffer can be directly inserted into the installation hole from the outside without using tools and then be limited from the top by the floating plate to complete the installation, and can also be directly taken out of the installation hole without using tools, the effect of facilitating the maintenance of the buffer is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural view of the external view of the present utility model;

[0021] Figure 2 is a schematic structural view of the front view cross-section of the present utility model;

[0022] Figure 3 is a schematic structural view of the oblique sectional three-dimensional view of the present utility model when not compressed;

[0023] Figure 4 is a schematic structural view of the oblique sectional three-dimensional view of the present utility model when compressed to the bottom;

[0024] Figure 5 is a schematic structural view of the buffer seat of the present utility model;

[0025] Figure 6 is a schematic structural view of the floating plate of the present utility model.

[0026] In the figure: 1. Buffer seat; 101. Mounting plate; 102. Step hole; 103. Buffer installation hole; 104. Slide groove; 2. Step shaft; 3. Floating plate; 301. Buffer groove; 302. Slide bar; 4. Compression spring; 5. Polyurethane pad; 6. Magnetic sheet; 7. Magnetorheological fluid buffer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] Next, in combination with the accompanying drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Embodiment

[0028] Please refer to Figures 1 to 6 , the present invention provides a technical solution: a buffer mechanism for an electric trolley of a European-style crane, including a buffer seat 1. One end of the buffer seat 1 is provided with a mounting plate 101. A stepped hole 102 is opened in the middle of the buffer seat 1. Buffer mounting holes 103 are opened at the four corners of the buffer seat 1. Sliding grooves 104 are opened at the middle positions of the four sides of the buffer seat 1. A slidable stepped shaft 2 is inserted into the stepped hole 102. One end of the stepped shaft 2 is fixedly installed with a floating plate 3 by screws. A compression spring 4 is sleeved on the outer surface of the stepped shaft 2. A buffer groove 301 is opened on the side of the floating plate 3 away from the buffer seat 1. Slide bars 302 inserted into the sliding grooves 104 are arranged around the side of the floating plate 3 close to the buffer seat 1. A polyurethane pad 5 is fixedly installed in the buffer groove 301 by screws. A magnetic sheet 6 is fixedly installed on the outer side of the slide bar 302 by screws. A magnetorheological fluid buffer 7 is inserted into the buffer mounting hole 103.

[0029] Specifically, the magnetorheological fluid buffer 7 uses magnetorheological fluid as the buffer liquid. When there is no magnetic sheet 6 close to the housing, the magnetorheological fluid has good fluidity like ordinary oil. When there is a magnetic sheet 6 close to the housing, the magnetic force will change the viscosity of the magnetorheological fluid. Specifically, the greater the magnetic force, the greater the viscosity of the magnetorheological fluid, and the greater the viscosity, the greater the buffer force of the magnetorheological fluid buffer 7. The materials of the buffer seat 1 and the floating plate 3 are both austenitic stainless steel that is not easily magnetized. Therefore, the magnetic force of the magnetic sheet 6 will not affect the buffer force of the magnetorheological fluid buffer 7 through the conduction of the buffer seat 1 and the floating plate 3. The polyurethane pad 5 is required to have high hardness and not be easily deformed. The polyurethane pad 5 is not used as a buffer component, but only to reduce noise.

[0030] Please refer to Figures 1 to 3 , the mounting plate 101 and the buffer seat 1 are integrally formed or spliced by welding. Screw clearance holes are opened at the four corners of the mounting plate 101. The mounting plate 101 fixes and installs the buffer seat 1 at the end of the crane electric trolley through the screw clearance holes and screws.

[0031] Specifically, when integrally formed, the stepped hole 102 and the buffer mounting hole 103 directly penetrate the mounting plate 101. When splicing by welding, the mounting plate 101 can be first drilled and then spliced, or it can be directly welded without drilling, but the length of the buffer seat 1 needs to be lengthened.

[0032] Please refer to Figures 2 to 4The stepped hole 102 has a small aperture in the middle and large apertures at both ends. The stepped shaft 2 is clearance-matched with the small diameter portion in the middle of the stepped hole 102. The outer diameter of the end of the stepped shaft 2 away from the floating plate 3 is larger than the small diameter portion in the middle of the stepped hole 102 but smaller than the large diameter portion at the end of the stepped hole 102.

[0033] Specifically, the step shaft 2 can slide in the step hole 102 but will not fall off. The sliding distance is greater than the distance between the floating plate 3 and the upper surface of the buffer seat 1 when the floating plate 3 is not collided, so that the end of the step shaft 2 does not hit the lifting trolley or the mounting plate 101 when the floating plate 3 contacts the buffer seat 1, thereby avoiding the step shaft 2 from being deformed by force. The fitting clearance between the step shaft 2 and the step hole 102 is between 0.05 mm and 0.08 mm on one side. The fitting surface is smooth and coated with a small amount of lubricating oil, and it is required to allow air to circulate and have a small amount of shaking.

[0034] See also Figures 2 to 4 , the compression spring 4 is in a compressed state, one end of the compression spring 4 is inserted into the step hole 102, and the other end pushes the floating plate 3 outward.

[0035] Specifically, the length of the compression spring 4 inserted into the step hole 102 is half of the telescopic distance of the step shaft 2. The material of the compression spring 4 is spring steel with good elasticity and a pitch of more than 5 times the wire diameter, so that the compression spring 4 can be completely compressed into the step hole 102 and still be able to restore its original state. The function of the compression spring 4 is to assist the magnetorheological fluid buffer 7 to push the floating plate 3 outward to the head.

[0036] See also Figures 1 to 3 The inner diameter of the buffer mounting hole 103 is larger than the outer diameter of the magnetorheological fluid buffer 7 shell, the depth of the buffer mounting hole 103 is larger than the length of the magnetorheological fluid buffer 7 shell, and a C-shaped broken edge groove is provided at one end of the buffer mounting hole 103 close to the floating plate 3, through which the magnetorheological fluid buffer 7 can be inserted from the outside into the inside. The magnetorheological fluid buffer 7 is inserted into the buffer mounting hole 103 from the C-shaped broken edge groove, and the telescopic rod of the magnetorheological fluid buffer 7 is pressed against the inner side of the floating plate 3.

[0037] Specifically, the inner diameter of the buffer mounting hole 103 is 0.2 mm larger than the outer diameter of the magnetorheological fluid buffer 7 shell, which is convenient for plugging and unplugging and has a small amount of shaking. The depth of the buffer mounting hole 103 is greater than the length of the magnetorheological fluid buffer 7 shell and the distance between the floating plate 3 and the buffer seat 1 is smaller than the stroke of the magnetorheological fluid buffer 7. Therefore, even if the floating plate 3 and the buffer seat 1 are in direct hard contact, it will not exceed the stroke of the magnetorheological fluid buffer 7, thereby preventing the shell of the magnetorheological fluid buffer 7 from being directly impacted, thereby achieving the purpose of protecting the magnetorheological fluid buffer 7.

[0038] See also Figures 3 to 4, the thickness dimension of the polyurethane pad 5 is greater than the depth dimension of the buffer groove 301. A through hole is provided at the middle position of the polyurethane pad 5, and countersunk holes are provided at the four corners of the polyurethane pad 5.

[0039] Specifically, the fact that the thickness dimension of the polyurethane pad 5 is greater than the depth dimension of the buffer groove 301 can prevent the floating plate 3 from directly colliding with the blocking block. The through hole in the middle of the polyurethane pad 5 is for avoiding the screw head of the fixed connection step shaft 2 and the floating plate 3. The countersunk holes provided at the four corners of the polyurethane pad 5 can prevent the screw heads for fixing the polyurethane pad 5 from being exposed.

[0040] Please refer to Figures 1 to 4 , the outer surface of the slide bar 302 protrudes from the side surface of the buffer seat 1. The number of magnetic pieces 6 is several, and the magnetic piece 6 closest to the magnetorheological fluid buffer 7 is flush with the end face of the housing of the magnetorheological fluid buffer 7.

[0041] Specifically, the fact that the outer surface of the slide bar 302 protrudes from the side surface of the buffer seat 1 is to prevent the magnetic piece 6 from contacting and rubbing against the side surface of the buffer seat 1. The distance between the lower end face of the slide bar 302 and the upper surface of the mounting plate 101 is greater than the distance between the floating plate 3 and the upper surface of the buffer seat 1 when the floating plate 3 is not collided, which can prevent the end of the slide bar 302 from colliding with the mounting plate 101 and deforming. The lowermost magnetic piece 6 is flush with the upper end face of the housing of the magnetorheological fluid buffer 7, which can prevent the buffer force of the magnetorheological fluid buffer 7 from being affected by magnetic force when the floating plate 3 is not stressed. The number of magnetic pieces 6 installed and the distance from the magnetorheological fluid buffer 7 can change the degree of increase in the buffer force when the magnetorheological fluid buffer 7 works. That is, the more magnetic pieces 6 are installed and the closer they are to the magnetorheological fluid buffer 7, the more magnetic force acts on the magnetorheological fluid buffer 7 when the floating plate 3 moves towards the buffer seat 1, making the buffer force of the magnetorheological fluid buffer 7 increase faster. On the contrary, the fewer magnetic pieces 6 are installed and the farther they are from the magnetorheological fluid buffer 7, the smaller the amount of magnetic force acting on the magnetorheological fluid buffer 7 when the floating plate 3 moves towards the buffer seat 1, and the more delayed the time for the buffer force of the magnetorheological fluid buffer 7 to increase and the smaller the increased value.

[0042] During use, first fix the buffer mechanism to the end of the electric trolley of the crane through the mounting plate 101, apply a little lubricating oil to the stepped shaft 2, and then insert all four magnetorheological fluid buffers 7 into the buffer mounting holes 103. The specific operation is to push the telescopic rod of the magnetorheological fluid buffer 7 against the inner wall of the floating plate 3 and then push hard to retract the telescopic rod into the housing. At this time, the overall length of the magnetorheological fluid buffer 7 becomes shorter. When the tail of the magnetorheological fluid buffer 7 can be pushed from the C-shaped edge-breaking groove into the buffer mounting hole 103, release the hand and let the magnetorheological fluid buffer 7 be inserted into the buffer mounting hole 103. At this time, the telescopic rod of the magnetorheological fluid buffer 7 is not stressed and extends outwards and abuts against the inner side of the floating plate 3. Further, install several magnetic sheets 6 on the outer side of the slide rod 302 according to requirements. The closer the position of the magnetic sheet 6 is to the magnetorheological fluid buffer 7, the shorter the distance that the floating plate 3 needs to be pushed for the magnetic sheet 6 to change the buffering force. That is, after the buffer mechanism collides with the blocking block, the buffering force of the magnetorheological fluid buffer 7 immediately becomes larger. The more magnetic sheets 6 are installed, the greater the magnetic force, and the greater the buffering force will be. On the contrary, if no magnetic sheet 6 is installed, the magnetorheological fluid buffer 7 is the same as an ordinary hydraulic buffer. How many magnetic sheets 6 to install and the specific installation position need to be determined by the customer according to the working conditions of their own crane. When using the buffer as a buffer mechanism, it is necessary to regularly check whether the buffer is damaged. The steps to remove the magnetorheological fluid buffer 7 during maintenance are opposite to the above installation actions. It is worth mentioning that the magnetorheological fluid buffer 7 does not require additional tools for both installation and removal, and the buffer mounting hole 103 is provided with a C-shaped edge-breaking groove, so that even if the magnetorheological fluid buffer 7 is not taken out, it can be roughly inspected, which is convenient for the subsequent maintenance work.

[0043] In summary, when the buffer mechanism for the electric trolley of the European-style crane collides, the greater the impact force, the longer the telescopic rod of the magnetorheological fluid buffer 7 is pushed back, and thus the greater the distance that the floating plate 3 moves towards the buffer seat 1 side. As a result, more magnetic sheets 6 will be closer to the magnetorheological fluid buffer 7, and more magnetic force will act on the magnetorheological fluid inside the magnetorheological fluid buffer 7. Consequently, the fluidity of the magnetorheological fluid becomes worse, and the buffering force of the magnetorheological fluid buffer 7 becomes greater, enabling the buffer mechanism to achieve the effect of automatically and gradually changing the buffering force according to the magnitude of the impact force. Since the buffer can be directly inserted into the mounting hole from the outside without using tools and then be limited from the top by the floating plate 3 to complete the installation, and can also be directly taken out of the mounting hole without using tools, it is convenient to repair the buffer.

[0044] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present utility model.

Claims

1. A buffer mechanism for an electric trolley of an European-style crane, comprising a buffer seat (1), characterized in that: One end of the buffer seat (1) is provided with a mounting plate (101). A stepped hole (102) is formed in the middle of the buffer seat (1). Buffer mounting holes (103) are formed at the four corners of the buffer seat (1). Sliding grooves (104) are formed in the middle positions of the four side surfaces of the buffer seat (1). A slidable stepped shaft (2) is inserted into the stepped hole (102). One end of the stepped shaft (2) is fixedly installed with a floating plate (3) by screws. A compression spring (4) is sleeved on the outer surface of the stepped shaft (2). A buffer groove (301) is formed on one side of the floating plate (3) away from the buffer seat (1). Slide bars (302) inserted into the sliding grooves (104) are arranged around the side of the floating plate (3) close to the buffer seat (1). A polyurethane pad (5) is fixedly installed in the buffer groove (301) by screws. A magnetic sheet (6) is fixedly installed on the outer side of the slide bar (302) by screws. A magnetorheological fluid buffer (7) is inserted into the buffer mounting hole (103).

2. The buffer mechanism for the electric trolley of the European crane according to claim 1, characterized in that: The mounting plate (101) and the buffer seat (1) are integrally processed or spliced by welding. Screw clearance holes are formed at the four corners of the mounting plate (101). The buffer seat (1) is fixedly installed at the end of the electric trolley of the crane through the screw clearance holes in cooperation with screws.

3. The buffer mechanism for the electric trolley of the European crane according to claim 1, characterized in that: The middle diameter of the stepped hole (102) is small and the diameters at both ends are large. The stepped shaft (2) is in clearance fit with the small-diameter part in the middle of the stepped hole (102). The outer diameter of the end of the stepped shaft (2) away from the floating plate (3) is larger than the small-diameter part in the middle of the stepped hole (102) but smaller than the large-diameter part at the end of the stepped hole (102).

4. The buffer mechanism for the electric trolley of the European crane according to claim 1, characterized in that: The compression spring (4) is in a compressed state. One end of the compression spring (4) is inserted into the stepped hole (102), and the other end pushes the floating plate (3) outwards.

5. The buffer mechanism for the electric trolley of the European crane according to claim 1, characterized in that: The inner diameter of the buffer mounting hole (103) is larger than the outer diameter of the shell of the magnetorheological fluid buffer (7). The depth of the buffer mounting hole (103) is greater than the length of the shell of the magnetorheological fluid buffer (7). A C-shaped edge-breaking groove for inserting the magnetorheological fluid buffer (7) from the outside is formed at one end of the buffer mounting hole (103) close to the floating plate (3). The magnetorheological fluid buffer (7) is inserted into the buffer mounting hole (103) from the C-shaped edge-breaking groove. The telescopic rod of the magnetorheological fluid buffer (7) abuts against the inner side of the floating plate (3).

6. The buffer mechanism for the electric trolley of the European crane according to claim 1, characterized in that: The thickness of the polyurethane pad (5) is larger than the depth of the buffer groove (301). A through hole is formed in the middle position of the polyurethane pad (5). Countersunk holes are formed at the four corners of the polyurethane pad (5).

7. The buffer mechanism for the electric trolley of the European crane according to claim 1, characterized in that: The outer surface of the slide bar (302) protrudes from the side surface of the buffer seat (1). The number of the magnetic sheets (6) is several, and the magnetic sheet (6) closest to the magnetorheological fluid buffer (7) is flush with the end face of the shell of the magnetorheological fluid buffer (7).

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