Lifting up-and-down limiting trigger device for hydraulic crane

Abstract

The utility model discloses a lifting up-and-down limiting trigger device for a hydraulic crane, which belongs to the technical field of hydraulic cranes and is characterized in that a winch is arranged on the hydraulic crane, the lifting up-and-down limiting trigger device comprises a shell, a cam erecting table is rotatably arranged in the shell and is connected with a winch shaft of the winch, and the cam erecting table is connected with the winch shaft of the winch. A cam part is arranged on the cam erecting table, a rubber sleeve is arranged on the outer side wall of the cam part, at least two limiting valve blocks are arranged in the shell, two limiting sliding blocks are respectively provided with a corresponding roller reversing valve, the two roller reversing valves are both used for controlling operation of the winch, at least two pressing plates are rotationally arranged in the shell, and when the cam erecting table rotates, the pressing plates are pressed by the pressing plates. According to the triggering device, the rubber sleeve is arranged on the outer side wall of the cam part, the rubber sleeve absorbs and disperses impact force generated when the cam part makes contact with the pressing plate, and therefore vibration and noise are reduced, abrasion is relieved, and the service life is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic cranes, and particularly relates to a lifting up-and-down limit triggering device for a hydraulic crane. Background Art

[0002] A hydraulic crane is a mechanical device that transmits force through a fluid (usually a liquid) to lift and lower heavy objects. Currently, in the prior art, the lifting limit device of a hydraulic crane mainly consists of components such as a weight, a bumper rod, a hinge, a steel wire rope, and a weight-type travel switch. However, since this lifting limit device can only limit the lifting height and not the lowering depth, its use has limitations.

[0003] Chinese Patent with Publication No. CN206108760U discloses a limit device for a hydraulic crane. The limit device includes a travel switch arranged in cooperation with a limit bumper. The travel switch includes a first mechanical travel reversing valve and a second mechanical travel reversing valve. The first ends of the first mechanical travel reversing valve and the second mechanical travel reversing valve are simultaneously connected to the oil tank and the brake. The second end of the first mechanical travel reversing valve is connected to the first oil port of the reversing valve, and the second end of the second mechanical travel reversing valve is connected to the second oil port of the reversing valve.

[0004] The above technical solution has the following defects: This limit device is provided with a rocker in the mechanical travel valve in cooperation with the limit bumper. The rocker action drives the mechanical travel valve to perform commutation switching. When the hydraulic winch is working, the pressure oil flows from the oil tank through the first mechanical travel reversing valve and the second mechanical travel reversing valve to the first oil port and the second oil port of the reversing valve, enabling the hydraulic motor to work. When the crane reaches the limit position during operation, the limit bumper collides with the rocker, causing the first mechanical travel reversing valve and the second mechanical travel reversing valve to commutate, and the pressure oil flows back from the hydraulic motor to the oil tank, and the motor stops rotating, thereby achieving the limit. However, the method of the limit bumper colliding with the rocker will generate a certain impact force, which will not only cause vibration and generate relatively large noise, but also cause wear and affect the service life. Summary of the Utility Model

[0005] The purpose of the present utility model is to propose a lifting up-and-down limit triggering device for a hydraulic crane, which has the advantage of a long service life, aiming at the above problems existing in the prior art.

[0006] The above technical objectives of the present utility model can be achieved through the following technical solutions: A lifting up and down limit triggering device for a hydraulic crane, wherein a winch is provided on the hydraulic crane. The lifting up and down limit device includes a housing, and a cam platform is rotatably arranged inside the housing. The cam platform is connected to the winch shaft of the winch. A cam portion is provided on the cam platform, and a rubber sleeve is arranged on the outer side wall of the cam portion. At least two limit valve blocks are arranged inside the housing, and corresponding roller reversing valves are respectively installed on the two limit valve blocks. Both of the two roller reversing valves are used to control the operation of the winch. At least two pressing plates are rotatably arranged inside the housing. When the cam platform rotates, the cam portion pushes the pressing plates to rotate, so that the pressing plates can contact the rollers of the roller reversing valves.

[0007] In the above-mentioned lifting up and down limit triggering device for a hydraulic crane, rotating wheels are rotatably arranged at both ends of the two pressing plates, and the cam portion is in rolling cooperation with the rotating wheels.

[0008] In the above-mentioned lifting up and down limit triggering device for a hydraulic crane, a main shaft is rotatably arranged inside the housing. The main shaft is connected to the cam platform, and one end of the main shaft extends out of the housing and is connected to the winch shaft of the winch.

[0009] In the above-mentioned lifting up and down limit triggering device for a hydraulic crane, a positioning ring is arranged inside the housing. The main shaft passes through the positioning ring, and a bearing is arranged between the main shaft and the positioning ring.

[0010] In the above-mentioned lifting up and down limit triggering device for a hydraulic crane, a mounting post is arranged inside the housing, and a rotating shaft is rotatably arranged inside the mounting post. The rotating shaft is connected to the pressing plate.

[0011] In the above-mentioned lifting up and down limit triggering device for a hydraulic crane, a limit sleeve is sleeved on the main shaft. One end of the limit sleeve abuts against the cam platform, and the other end of the limit sleeve abuts against the bearing.

[0012] In the above-mentioned lifting up and down limit triggering device for a hydraulic crane, the cam platform is installed on a support base, and the support base is connected to the main shaft.

[0013] In the above-mentioned lifting up and down limit triggering device for a hydraulic crane, a wear-resistant coating is arranged on the outer side wall of the rotating wheel.

[0014] In summary, the beneficial effects of the present utility model compared with the prior art are:

[0015] When the winch is working, the winch shaft of the winch drives the cam platform to rotate. As the cam platform rotates, the cam part pushes the pressure plate to rotate. The pressure plate contacts the roller of the roller reversing valve, causing the roller reversing valve to change direction and controlling the flow direction of the pressure oil, thereby stopping the rotation of the winch motor. By setting a rubber sleeve on the outer side wall of the cam part, when the cam part contacts the pressure plate, the rubber sleeve can absorb and disperse the impact force generated by the contact between the two, thereby reducing vibration and noise, and can also reduce wear and extend the service life. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the embodiment;

[0017] Figure 2 It is a partial cross-sectional view of the embodiment;

[0018] Figure 3 It is a schematic structural diagram of the hydraulic crane of the embodiment.

[0019] Reference Numerals: 1, winch; 2, housing; 3, cam platform; 4, cam part; 5, rubber sleeve; 6, limit valve block; 7, roller reversing valve; 8, pressure plate; 9, rotating wheel; 10, main shaft; 11, positioning ring; 12, bearing; 13, mounting post; 14, rotating shaft; 15, limit sleeve; 16, support base. Detailed Description of the Invention

[0020] The following are specific embodiments of the present invention and in combination with the drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0021] A lifting up and down limit trigger device for a hydraulic crane, as Figures 1 to 3 shown, a winch 1 is provided on the hydraulic crane.

[0022] The lifting up and down limit device includes a housing 2. A cam platform 3 is rotatably arranged inside the housing 2. The cam platform 3 is connected to the winch shaft of the winch 1. Specifically, a main shaft 10 is rotatably arranged inside the housing 2. One end of the main shaft 10 extends out of the housing 2 and is connected to the winch shaft of the winch 1. The main shaft 10 is connected to the cam platform 3.

[0023] Specifically, the cam platform 3 is installed on the support base 16 by cooperation of bolts and nuts, thereby realizing the stable connection between the cam platform 3 and the support base 16. The support base 16 is connected to the main shaft 10 by cooperation of bolts and nuts, thereby realizing the stable connection between the support base 16 and the main shaft 10. A cam part 4 is arranged on the cam platform 3, and the cam platform 3 and the cam part 4 are integrally arranged.

[0024] At least two limiting valve blocks 6 are arranged inside the housing 2, and corresponding roller reversing valves 7 are respectively installed on the two limiting valve blocks 6. Both of the two roller reversing valves 7 are used to control the operation of the winch 1. It should be noted that how to control the flow direction of the pressure oil through the roller reversing valve 7 and thus control the operation of the winch 1 belongs to the prior art, and no more details will be elaborated here.

[0025] At least two pressing plates 8 are rotatably arranged inside the housing 2. Specifically, mounting columns 13 are arranged inside the housing 2. There are two mounting columns 13, which correspond to the two pressing plates 8 one by one. A rotating shaft 14 is rotatably arranged inside the mounting column 13. There are two rotating shafts 14, which correspond to the two mounting columns 13 one by one. The rotating shaft 14 is connected to the pressing plate 8, that is, the pressing plate 8 rotates around the rotating shaft 14.

[0026] When the cam lifting platform 3 rotates, the cam part 4 pushes the pressing plate 8 to rotate, so that the pressing plate 8 can contact the roller of the corresponding roller reversing valve 7.

[0027] Rotating wheels 9 are rotatably arranged at both ends of the two pressing plates 8. The cam part 4 is in rolling cooperation with the rotating wheels 9. Through the rolling cooperation of the two, not only can the wear be reduced, but also the cam part 4 can more easily pass through the rotating wheels 9, and the cam part 4 can more easily push the pressing plate 8 to rotate.

[0028] Furthermore, a wear-resistant coating is arranged on the outer side wall of the rotating wheel 9 to reduce the wear of the rotating wheel 9 and extend the service life of the rotating wheel 9.

[0029] A rubber sleeve 5 is arranged on the outer side wall of the cam part 4. By arranging the rubber sleeve 5 on the outer side wall of the cam part 4, when the cam part 4 contacts the pressing plate 8, the rubber sleeve 5 can absorb and disperse the impact force generated by the contact between the two, thereby reducing vibration and noise, and can also reduce wear and extend the service life.

[0030] As another solution, a wear-resistant coating can also be arranged on the outer side wall of the cam part 4 to reduce the wear of the cam part 4.

[0031] A positioning ring 11 is arranged inside the housing 2. The main shaft 10 passes through the positioning ring 11, and a bearing 12 is arranged between the main shaft 10 and the positioning ring 11 to ensure the smooth rotation of the main shaft 10 and reduce the friction and wear of the main shaft 10 during rotation.

[0032] A limiting sleeve 15 is sleeved on the main shaft 10. One end of the limiting sleeve 15 abuts against the cam lifting platform 3, and the other end of the limiting sleeve 15 abuts against the bearing 12 to ensure the stability of the bearing 12.

[0033] The specific embodiments described herein are merely illustrative of the spirit of the present utility model; those skilled in the art to which the present utility model pertains may make various modifications or supplements to the described specific embodiments or use similar means for substitution, but will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

Claims

1. A lifting upper and lower limit trigger device for a hydraulic crane, wherein a winch (1) is provided on the hydraulic crane, and it is characterized in that: The lifting upper and lower limit device includes a housing (2), a cam table (3) is rotatably arranged in the housing (2), the cam table (3) is connected to the winch shaft of the winch (1), a cam portion (4) is arranged on the cam table (3), a rubber sleeve (5) is arranged on the outer side wall of the cam portion (4), at least two limit valve blocks (6) are arranged in the housing (2), corresponding roller reversing valves (7) are respectively installed on the two limit valve blocks (6), and the two roller reversing valves (7) are both used to control the operation of the winch (1). At least two pressing plates (8) are rotatably arranged in the housing (2). When the cam table (3) rotates, the cam portion (4) pushes the pressing plate (8) to rotate, so that the pressing plate (8) can contact the roller of the roller reversing valve (7).

2. The lifting up and down limit trigger device for a hydraulic crane according to claim 1, characterized in that: Rotating wheels (9) are rotatably arranged at both ends of the two pressing plates (8), and the cam portion (4) is in rolling cooperation with the rotating wheels (9).

3. The lifting up and down limit trigger device for a hydraulic crane according to claim 1, characterized in that: A main shaft (10) is rotatably arranged in the housing (2), the main shaft (10) is connected to the cam table (3), and one end of the main shaft (10) extends out of the housing (2) and is connected to the winch shaft of the winch (1).

4. The lifting up and down limit trigger device for a hydraulic crane according to claim 3, characterized in that: A positioning ring (11) is arranged in the housing (2), the main shaft (10) passes through the positioning ring (11), and a bearing (12) is arranged between the main shaft (10) and the positioning ring (11).

5. The upper and lower limit trigger device for the hoisting of a hydraulic crane according to claim 1, characterized in that: An installation column (13) is arranged in the housing (2), a rotating shaft (14) is rotatably arranged in the installation column (13), and the rotating shaft (14) is connected to the pressing plate (8).

6. The lifting up and down limit trigger device for a hydraulic crane according to claim 4, characterized in that: A limit sleeve (15) is sleeved on the main shaft (10), one end of the limit sleeve (15) abuts against the cam table (3), and the other end of the limit sleeve (15) abuts against the bearing (12).

7. The lifting up and down limit trigger device for a hydraulic crane according to claim 6, characterized in that: The cam table (3) is installed on a support base (16), and the support base (16) is connected to the main shaft (10).

8. The lifting up and down limit trigger device for a hydraulic crane according to claim 2, characterized in that: A wear-resistant coating is arranged on the outer side wall of the rotating wheel (9).

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