JP2010285226A - Hydraulic control cylinder device for single rope type grab bucket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the reliability of a hydraulic control mechanism including a hydraulic cylinder while reducing the size and weight of a hydraulic control cylinder device for a single rope-type grab bucket. <P>SOLUTION: An oil tank provided on a side surface of a lower end of a hydraulic control cylinder and a manifold block included in a hydraulic circuit of a hydraulic control mechanism are fixed to a side surface of a lower end of a cylinder body. The oil tank is made to communicate with a communication path at a lower side of the cylinder that is opened to a lower end closed block of the cylinder body, and an entrance of a mainstream path of the manifold block is made to communicate with a communication path at an upper side of the cylinder of an upper end closed block. Furthermore, an exit of the mainstream path of the manifold block is made to communicate with the communication path at the upper side of the cylinder of the upped end closed block. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention is a grab packet of a shell type or an orange peel type for controlling a grab opening / closing operation of a single rope type grab bucket that opens and closes a shell by operating a hydraulic control cylinder and lifting and hanging by a crane. The present invention relates to a hydraulic control cylinder device to be used.

  In general, a single rope type grab bucket that opens and closes a shell by operating a hydraulic control cylinder and lifting and hanging by a crane is widely used (for example, Patent Documents 1, 2, and 3).

  As shown in FIG. 7, the conventional single rope type grab bucket 1 includes a pair of shells 2 and 2 that are configured to open and close to each other and that pivot about the rotational centers of the shells 2 and 2. The lower frame 3, the upper frame 5 positioned on the upper side of the lower frame 3 and connected to the back of each shell 2, 2 via the suspension arms 4, 4. The intermediate movable frame 7 connected via a hydraulic control cylinder A (shown in FIG. 9), the lower end of the intermediate movable frame 7 is fixed, and the intermediate movable frame 7 and the upper frame 5 are provided respectively. A wire rope 8 for hanging and grab closing that is wound around a pulley and extended upward, and a hydraulic valve control block B (shown in FIG. 10) for controlling the operation of the hydraulic control cylinder A are provided. It is configured.

  The hydraulic valve control block B communicates with both ends of the hydraulic control cylinder A, and is a hydraulic control having a pilot type check valve that is switched between a state allowing only one-way flow and a state allowing two-way flow. The flow path is configured.

  In this single rope type grab bucket, the lower frame 3 is moved to the intermediate movable frame 7 by operating the hydraulic control means with the shell shown in FIG. On the other hand, the lower frame 3 and the shell 2 are brought into a free state, and the lower frame 3 is lowered by the dead weight of the lower frame 3 and the shell 2 and the shells 2 and 2 are opened.

  In this state, the crane is operated to move the grab bucket onto the desired gripping object and lower it. When the wire rope 8 is lowered in a state where the shells 2 and 2 are put on the gripping object (landing state), the intermediate movable frame 7 becomes free with respect to the upper frame 5, and the intermediate movable frame 7 is The piston rod 6c of the hydraulic control cylinder A is pushed into the cylinder body 6a at the same time as it descends in the direction approaching the lower frame 3.

  When the intermediate movable frame 7 is lowered to a predetermined position in this way, the hydraulic control cylinder A is automatically disabled by the manifold block B. In this state, the intermediate movable frame 7 is moved in the direction approaching the upper frame 5 by lifting the wire rope 8 with a crane, the shells 2 and 2 are closed, and the gripping object is gripped in the shell, and the state shown in FIG. Can be lifted.

  As shown in FIG. 10, the conventional hydraulic control cylinder A used in the single rope type grab bucket operating in this way is centered on the connecting portion of the piston rod 6c to the piston 6b sliding inside the cylinder body 6a. A plurality of escape passages 10 are formed through the piston 6b on the circumference, and check valves 9 that individually operate are provided in the respective escape passages 10, so that the intermediate movable frame 7 described above is self-weighted. Thus, when moving in the direction approaching the lower frame 3 (lowering), each escape passage 10 is opened so that the intermediate movable frame 7 can be smoothly lowered even at a high speed.

As shown in FIG. 11, the hydraulic control mechanism including the hydraulic control cylinder of such a conventional single rope type grab bucket has a cylinder body 6a attached to a bottom plate of a box-type lower frame 3 formed by welding steel plates. A structure in which the lower end is fixed, the manifold block B and the oil tank C are fixed to the outside of the lower frame 3, and the flow path communicating between them is communicated by a flexible pressure-resistant hose 11 housed in the lower frame. there were.
JP 2003-148417 A JP 2005-289551 A JP 2006-135780 A

  In the conventional hydraulic control cylinder device for single rope type grab bucket as described above, the cylinder body, the manifold block, and the oil tank are separately fixed to the lower frame as described above, and the pressure resistance between these is fixed. Because it was a structure that communicated with a hose, the shape of the entire lower frame including them became larger, limiting the gripping amount of the bucket and causing an increase in weight, and the ratio of the bucket weight to the load capacity of the crane increased. There was a problem that cargo handling efficiency decreased.

  Also, as the grab bucket becomes larger, the load on the hydraulic cylinder increases and the internal pressure of the hydraulic circuit increases, so the pressure hose must be compatible with high pressure, and the strength of the hose connection part is durable. In order to greatly influence the hose connection work, skilled workers who are familiar with the hydraulic circuit are required. However, because the technical field differs greatly between the manufacturing of the bucket and the manufacturing of the hydraulic circuit, workers who are familiar with both technologies However, there was a problem that workers in different fields had to be engaged separately in the production of one bucket, resulting in high costs.

  In view of such a problem of the conventional technology, the present invention aims to reduce the size and weight of a hydraulic control cylinder device for a single rope type grab bucket and to manufacture a hydraulic control mechanism including a hydraulic cylinder separately from a bucket manufacturing plant. It was made for the purpose of providing a hydraulic control cylinder device for a single rope type grab bucket that can be completed by simply incorporating it into a bucket at a grab bucket manufacturing factory.

The feature of the invention described in claim 1 for solving the conventional problems as described above and achieving the intended object is that a grab is supported in an openable and closable manner and an upper side of the lower frame. An upper frame connected to the back surface of the grab via a suspension arm, an intermediate movable frame between the upper and lower frames, and one end side extended upwardly around a pulley between the intermediate movable frame and the upper frame. A single rope grab bucket with a hanging wire rope for grab closure,
A hydraulic control cylinder interposed between the intermediate movable frame and the lower frame; a hydraulic control mechanism for controlling the operation of the hydraulic control cylinder; and an oil tank. The hydraulic control cylinder is attached to the lower frame. A supported cylinder body, a piston accommodated therein so as to be movable in the axial direction, a base end is fixed to the piston, and a tip protrudes upward from the upper end of the cylinder body and is connected to the intermediate movable frame. The piston has a relief passage that penetrates vertically, and the relief passage is provided with a check valve that restricts the flow of oil from the upper side to the lower side of the piston. The hydraulic control mechanism is a single-line grab bucket configured to control the operation of the intermediate movable frame from the lower frame side to the upper frame side by remote control. In the hydraulic control cylinder device,
The oil tank and a manifold block constituting a hydraulic circuit of the hydraulic control mechanism are fixed to a lower end side surface of the cylinder body on the lower end side surface of the hydraulic control cylinder, and the lower end closing block of the oil tank and the cylinder body is fixed. A cylinder lower side communication path opened in the cylinder block, the inlet side of the main flow path of the manifold block is connected to the cylinder upper side communication path of the upper end closing block, and the outlet side of the main flow path of the manifold block is connected to the cylinder It is in communication with the cylinder upper side communication passage of the upper end closing block of the main body.

  According to a second aspect of the present invention, in addition to the structure of the first aspect, the cylinder communication hole and the cylinder main body are formed by opening a cylinder communication hole on a side surface of the oil tank and fixing the oil tank to the cylinder. The cylinder lower side communication passage opened in the lower end closing block is aligned and communicated with each other.

  According to a third aspect of the present invention, in addition to the configuration of the first aspect, the oil tank and a cylinder lower side communication passage opened in a lower end closing block of the cylinder body are communicated via a steel pipe. is there.

  According to a fourth aspect of the present invention, in addition to the configuration of any one of the first to third aspects, the lower end closing block of the cylinder body has a manifold integrally formed on its side surface. A block fixing base is provided, and the manifold block is fixed to the upper surface of the fixing base, so that the outlet side of the main flow path of the manifold block communicates with the cylinder lower communication path of the lower end closing block.

  In the present invention, as described above, the oil tank and the manifold block constituting the hydraulic circuit of the hydraulic control mechanism are fixed to the lower end side surface of the cylinder body on the lower end side surface of the hydraulic control cylinder. The cylinder lower side communication path opened in the lower end closing block is communicated, the inlet side of the main flow path of the manifold block is communicated with the cylinder upper side communication path of the upper end closing block, and the outlet side of the main flow path of the manifold block is By communicating with the cylinder upper side communication passage of the upper end closing block of the cylinder body, the hydraulic control cylinder, the manifold block constituting the hydraulic control mechanism and the oil cylinder can be manufactured as a unit. The unit can be manufactured in a hydraulic factory. Therefore, compared to the conventional case where each member is supported separately to the lower frame and connected with a pressure hose between them, the bucket manufacturing plant does not require advanced hydraulic knowledge. Assembly work is possible.

  Moreover, by unitizing as described above, space saving is achieved as compared with the conventional case, the shape of the entire lower frame is reduced, and weight reduction can be achieved.

  Furthermore, by opening a cylinder communication hole on the side of the oil tank and fixing the oil tank to the cylinder, the cylinder communication hole and the cylinder lower side communication path opened in the lower end closing block of the cylinder body are aligned. By connecting them to each other, the flow between the oil tank and the cylinder is connected to each other, and the pipes are not exposed, so the strength increases and the bottom surface is exposed. And the shape of the lower frame can be simplified.

  In the present invention, the oil tank and the cylinder lower side communication passage opened in the lower end closing block of the cylinder body are configured to communicate with each other through a steel pipe, thereby facilitating the connecting operation of the hydraulic flow path between them. Dimensional errors can be absorbed by the steel pipe.

  Further, in the present invention, the lower end closing block of the cylinder body is provided with a manifold block fixing base in a shape projecting integrally on the side surface thereof, and the manifold block is fixed to the upper surface of the fixing base, whereby the manifold block is fixed. By connecting the inlet side of the main flow path of the block and the cylinder lower passage of the lower end closing block, piping can be omitted, the structure is simplified, and the cost is reduced.

  Next, an embodiment of a hydraulic control cylinder device for a single rope type grab bucket according to the present invention will be described with reference to examples shown in FIGS. In addition, the same code | symbol is attached | subjected to the same part as the prior art example mentioned above, and duplication description is abbreviate | omitted.

  In the figure, reference numeral 1 denotes a single rope type grab bucket having a pair of shells 2, 2, a lower frame 3, an upper frame 5, and an intermediate movable frame 7, similar to the above-described conventional example, and the upper frame 5 and the intermediate movable frame. 7 is operated in a direction approaching each other by suspension by a wire rope 8 for hanging and grab closing.

  A hydraulic control cylinder 20 is interposed between the lower frame 3 and the intermediate movable frame 7. The hydraulic control cylinder 20 has a cylindrical cylinder body 20a, an upper end closing block 21 whose upper end is closed, and a lower end closing block 22 whose lower end is closed. As shown in the circuit, the piston 23 is housed so as to be movable up and down, thereby partitioning the cylinder body 20a up and down. The piston 23 is formed with a relief flow path 24 that is open upward and downward, and the relief flow path allows a flow from the lower side to the upper side and prevents a flow from the upper side to the lower side. 25 is installed.

  The entrance / exit rod 24 fixed to the piston 23 has an upper end protruding upward through the upper closing block 21 as shown in FIG. The distal end of the entry / exit rod 24 is fixed to the intermediate movable frame 7 via a connecting metal part 26. The connecting metal part 26 has a hollow tower shape, and the tip of the access rod 24 is fixed to the top of the hollow tower shape.

  The connecting metal part 26 is formed in such a size that the protruding portion of the hydraulic control cylinder 20 protruding on the lower frame 3 is inserted, and the intermediate movable frame 7 and the upper frame 5 are brought close to each other. At this time, the central portion of the upper frame 5 is projected upward.

  A fixing flange 30 is integrally formed on the body portion of the cylinder body 20 a, and the hydraulic control cylinder 20 is fixed to the lower frame 3 by screwing the flange 30 to the top plate 31 of the lower frame 3.

  An oil tank 32 and a manifold block 33 constituting a hydraulic circuit of a hydraulic control mechanism are fixed to the side surface of the cylinder body 20a at a position below the flange 30. These two members are fixed at symmetrical positions with respect to the cylinder body 20a. The oil tank 32 has both side edges of the oil tank 32 with respect to the screw fixing base 34 built up on the outer peripheral surface of the cylinder body 20a. The fixing flange 35 formed on the portion is fixed by screwing.

  Further, the manifold block 33 is screwed to a screw fixing base 36 whose upper side is built up on the outer peripheral surface of the cylinder body 20a, and a lower end surface of the manifold block 33 is integrally projected on the side surface of the lower closing block 21. It fixes by making it contact | abut to the fixed base part 37 and screwing to this.

  A cylinder upper side communication passage 40 communicating with a cylinder upper hydraulic chamber a (shown in FIG. 6) in the cylinder body 20 a is opened on the outer peripheral surface of the upper closing block 21, and this is connected to an upper end side port 41 of the manifold block 33. Is communicated by a pressure hose 42 along the longitudinal direction of the cylinder body 20a. In addition, you may use metal pipes, such as a steel pipe pipe, instead of this pressure | voltage resistant hose.

  The lower closing block 22 is formed with a cylinder lower side communication passage 43 that communicates with a cylinder lower hydraulic chamber b (shown in FIG. 6) in the cylinder body 20a. One end side 43 a branched to the outer side is opened on the outer peripheral surface on the oil tank 32 side, and the other end side 43 b is opened on the upper surface of the manifold block fixing base 37.

  The one end side 43a of the cylinder lower side communication passage 43 and the opening on the bottom surface of the oil tank 32 are connected by a communication pipe 44 made of a steel pipe.

  Further, the other end side 43b of the cylinder lower side communication passage 43 is communicated with the lower end side port 45 of the manifold block 33 thereon. The lower end side of the manifold block 33 is fixed to the fixing base 37 by joining the bottom face of the manifold block to the upper surface of the manifold block fixing base 37 and screwing. At this time, the lower end side port 45 and the cylinder lower side communication path 43 are fixed. The other end side 43b is in communication with each other by being aligned.

  The manifold block 33 constitutes the hydraulic circuit shown in FIG. This hydraulic circuit has a logic valve 50, a pilot valve 51 for opening and closing the logic valve 50, and an on-off valve 52 with flow control. The pilot valve 51 and the on-off valve 52 with flow control use spool type solenoid valves, which are switched by energizing the electromagnetic coils provided in them, and return to the original state by the spring pressure when not energized. It has become.

  The logic valve 50 opens and closes the main flow path 55 from the upper end side port 41 to the lower end side port 45 of the manifold block 33. When the pilot pressure is applied to the pilot port 50c, the main flow path 55 is closed, The pilot pressure is released when the pilot pressure disappears. The inlet side port 50a of the logic valve 50 communicates with the inlet side 55a of the main channel 55, and the outlet side port 50b communicates with the outlet side 55b of the main channel 55.

  A pilot pressure channel 56 from the pilot valve 51 communicates with the pilot port 50c. The pilot valve 51 switches and communicates the first branch flow path 57 branched from the inlet side 55a of the main flow path 55 to the pilot pressure flow path 56, and the flow paths 56, 57 are always in a spring pressure. Is in a communication state, and energizing the electromagnetic coil causes the pilot flow path 56 to communicate with the outlet side 55b of the main flow path 55, and the first branch flow path 57 is closed. The first branch flow path 57 has a flow rate adjusting valve 57a for limiting the flow rate.

  The on-off valve 52 with flow control is for communicating the second branch flow path 58 branched from the inlet side 55a of the main flow path 55 and the bypass flow path 59 leading to the outlet side 55b of the main flow path 55, Normally, the space between the flow paths 58 and 59 is closed by the spring pressure. By supplying a current to the electromagnetic valve, the two flow paths 58 and 59 are communicated with each other, and the inlet side 55a and the outlet side 55b of the main flow path 55 are communicated without passing through the logic valve 50. The flow rate at this time is adjusted by a flow rate adjusting valve 60 provided in the second branch flow path 58.

  In the manifold block 33, when the hydraulic pressure from the hydraulic control cylinder 20 is applied from the upper end side port 41, a large amount of oil is flowed so that the piston 23 can move upward in a fast operation by opening the logic valve 55. In addition, by opening the bypass passage 59 with the logic valve 50 closed, a limited flow rate of oil is allowed to flow so that the piston 23 is operated upward at a slower speed than the above. .

  When it is desired to increase the opening speed when the object to be grasped is held by the shells 2 and 2 of the grab bucket 1 and released from the closed state, the main flow passage 55 is opened by the logic valve 50 and the opening is delayed. In this case, the on-off valve 52 with flow control is operated to open the bypass passage 59.

  This fast / slow operation can be performed in combination between the start of opening of the shells 2 and 2 and the end of opening as required. For example, by slowing the movement at the beginning of opening, speeding up near the end of opening, and increasing the shock at the completion of opening, the gripping of the grip from the shell can be improved, and conversely the shock at the end of opening. In order to make it small, it is also possible to control so that the opening speed is slowed down near the end of opening.

  In the above-described embodiment, the oil tank 32 and the cylinder lower side communication passage 43 opened in the lower end closing block 22 of the cylinder body 20a are communicated with each other via the communication pipe 44 made of a steel pipe. 7, the cylinder communication hole 32 a is opened on the side surface of the oil tank 32, and the cylinder lower side communication passage 43 is opened on the oil tank fixing side surface of the lower end closing block 22 of the cylinder body. By fixing to the cylinder 20, the cylinder communication hole 32a and the cylinder lower side communication path 43 may be aligned and communicated with each other, and in this way, the oil tank 32 and the cylinder 20 are fixed. As a result, the flow paths are connected to each other, and the pipe is exposed. Fried strength is increased, can be structured to expose the lower surface, it can be simplified shape of the lower frame.

1 is a longitudinal sectional view of a single rope type grab bucket in a hydraulic control cylinder device according to the present invention. It is a side view of the single rope type grab bucket. It is a front view of the hydraulic control cylinder apparatus currently used for the single rope type grab bucket. It is the same top view. It is a front view of the state which removed the oil tank and the manifold block from the cylinder main body of the hydraulic control cylinder apparatus. It is a hydraulic circuit diagram of a hydraulic control cylinder device same as the above. It is a front view of the state which removed the oil tank and the manifold block from the cylinder main body of the other example of the hydraulic control cylinder apparatus. The conventional single rope type grab bucket is shown, and it is a side view in the state where the shell was closed. It is the side view of the state which opened the shell which shows the single rope type grab bucket. It is a hydraulic circuit diagram of the hydraulic control cylinder of the single rope type grab bucket. It is sectional drawing which shows the assembly | attachment state with respect to the lower frame of a hydraulic control cylinder apparatus same as the above.

a cylinder lower hydraulic chamber b cylinder upper hydraulic chamber 1 single rope type grab bucket 2 shell 3 lower frame 4 suspension arm 5 upper frame 7 intermediate movable frame 8 wire rope 20 hydraulic control cylinder 20a cylinder body 21 upper end closing block 22 lower end closing block 23 Piston 24 Relief channel 25 Check valve 26 Connecting bracket 30 Fixing flange 31 Top plate 32 of lower frame 3 Oil tank 32a Cylinder communication hole 33 Manifold block 34 Screw fixing base 35 Fixing flange 36 Screw fixing base 37 Manifold block fixing base Part 40 Cylinder upper side communication passage 41 Upper end side port 42 Pressure hose 43 Cylinder lower side communication passage 43a One end side 43b Other end side 44 Communication pipe 45 Lower end side port 50 Logic valve 50a Inlet side port 50b Outlet side port 50 c Pilot port 51 Pilot valve 52 Open / close valve with flow control 55 Main flow path 55a Inlet side 55b Outlet side 56 Pilot pressure flow path 57 First branch flow path 57a Flow control valve 58 Second branch flow path 59 Bypass flow path 60 Flow control valve

Claims (4)

A lower frame that supports the grab so as to be openable and closable; an upper frame that is located above the lower frame and is connected to the back surface of the grab through a suspension arm; an intermediate movable frame between the upper and lower frames; In a single rope grab bucket provided with a wire rope for hanging and grab closing that is wound around a pulley between an intermediate movable frame and the upper frame and extended at one end side upward,
A hydraulic control cylinder interposed between the intermediate movable frame and the lower frame, a hydraulic control mechanism for controlling the operation of the hydraulic control cylinder, and an oil tank;
The hydraulic control cylinder includes a cylinder main body supported by the lower frame, a piston accommodated therein so as to be movable in an axial direction, a base end fixed to the piston, and a tip protruding upward from the upper end of the cylinder main body. And an access rod connected to the intermediate movable frame, and the piston has an escape passage penetrating vertically, and oil flows from the upper side to the lower side of the piston in the escape passage. A regulated check valve,
In the hydraulic control cylinder device for a single rope type grab bucket, the hydraulic control mechanism is configured to control the operation from the lower frame side to the upper frame side of the intermediate movable frame by remote control.
Fixing the oil tank on the lower end side surface of the hydraulic control cylinder and the manifold block constituting the hydraulic circuit of the hydraulic control mechanism to the lower end side surface of the cylinder body;
The oil tank and the cylinder lower side communication passage opened in the lower end closing block of the cylinder body are communicated,
The inlet side of the main flow path of the manifold block communicates with the cylinder upper side communication path of the upper end closing block, and the outlet side of the main flow path of the manifold block communicates with the cylinder upper side communication path of the upper end closing block of the cylinder body. A hydraulic control cylinder device for a single rope type grab bucket.   By opening a cylinder communication hole on the side of the oil tank and fixing the oil tank to the cylinder, the cylinder communication hole and the cylinder lower side communication path opened in the lower end closing block of the cylinder body are aligned and communicate with each other. The hydraulic control cylinder device for a single rope type grab bucket according to claim 1.   2. The hydraulic control cylinder device for a single rope type grab bucket according to claim 1, wherein the oil tank and a cylinder lower side communication passage opened in a lower end closing block of the cylinder body are communicated with each other via a steel pipe.   The lower end closing block of the cylinder body is provided with a manifold block fixing base in a shape integrally projecting on the side surface thereof, and the manifold block is fixed to the upper surface of the fixing base, whereby the main flow path of the manifold block is fixed. 4. The hydraulic control cylinder device for a single rope type grab bucket according to claim 1, wherein the outlet side and the lower cylinder closing passage of the lower end closing block communicate with each other.

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