JP5342937B2 - Hydraulic cylinder device - Google Patents

Description

  The present invention relates to a hydraulic cylinder device which is applied as a power source for various devices such as a crusher used for dismantling a concrete body.

  A crushing machine using a hydraulic cylinder device as a power source for the blades is known as a power source for the blades by opening and closing a pair of blades pivotably attached to each other to crush concrete bodies such as columns and beams. ing. Also, in the crusher, in order to crush concrete or the like with the blade body, it is also known that if the opening / closing speed of the blade body is increased by the cylinder device using the crusher, the work efficiency is improved accordingly. Yes. Then, in order to increase the opening / closing speed of the blade body, the piston rod used as the blade body opening / closing means is accelerated, and as a means for that, when the piston rod is advanced, the hydraulic pressure in the cylinder and the hydraulic pump There has been proposed a structure using a hydraulic circuit in which hydraulic pressures are combined and injected into a piston rod delivery side in a cylinder (for example, Patent Document 1).

  In the cylinder device having a structure in which the hydraulic pressures are combined, since the hydraulic pressure on the discharge side from the cylinder and the hydraulic pressure on the hydraulic pump side are loaded on the piston rod, the piston rod can be rapidly advanced. The blade closing operation to be performed is inevitably faster and the working efficiency can be improved. However, when the piston rod is returned to the original position, the rapid return cannot be expected, which is not always satisfactory. In order to expect rapid return, a piston cylinder having a base end as a piston part is slid into a hydraulic chamber constituting the front and rear hydraulic chambers of the cylinder, and is slid relatively to the piston cylinder. The fixed piston is attached to the tip of a shaft tube disposed in the piston cylinder through the piston part with the base part integrated with the base part of the cylinder, and the piston cylinder is divided by the stationary piston before and after the piston cylinder. Two hydraulic chambers are provided, and the rear second hydraulic chamber communicates with a second hydraulic inlet / outlet provided in the cylinder through a guide path constituted by the shaft tube, and communicates with the second hydraulic inlet / outlet and the rear hydraulic chamber portion. One hydraulic inlet / outlet, a third hydraulic inlet / outlet communicating with the front hydraulic chamber, and a fourth hydraulic inlet / outlet communicating with the front second hydraulic chamber are communicated with an external hydraulic circuit, and the first to second Through the four hydraulic doorways Having a configuration structure to and out hydraulically (hydraulic oil) in the hydraulic chambers Te has been proposed (e.g., Patent Document 2).

No. 5-16298 JP 2008-51194 A

  In the hydraulic cylinder device having the above structure disclosed in Patent Document 2, the expansion and contraction operation is performed through the second hydraulic inlet / outlet through the second front hydraulic chamber located on the front side of the stationary piston that is slidably fitted to the piston cylinder. In order to perform the expansion and contraction operation by taking in and out (hydraulic oil), the hose constituting the pipe line communicating with the second hydraulic inlet / outlet and the hydraulic pump or tank moves along with the advance / retreat operation of the piston cylinder. Therefore, when the cylinder device is used, for example, for opening / closing driving of a blade of a crusher, an unnecessary movement space for moving the hose accompanying movement of the piston cylinder in crushing operation is secured. And sometimes the hose can interfere with the crushing operation. The present invention pays attention to the disadvantages of such a conventional example, and it is not necessary to assemble a hose for supplying and discharging hydraulic pressure to the piston cylinder, which is a moving body, and therefore it is not necessary to secure a moving space, The present invention has been invented for the purpose of providing a cylinder device capable of moving the piston cylinder back and forth at a relatively high speed.

A piston cylinder having a base end portion as a piston portion is slidably fitted into the hydraulic chambers constituting the front and rear hydraulic chamber portions of the cylinder, and the stationary piston is extended from the base portion of the cylinder by being relatively slid into the piston cylinder. And a second hydraulic chamber is provided between the stationary piston and the piston portion, the second hydraulic chamber being provided between the fixed piston and the piston portion through the piston portion. A third hydraulic pressure port that communicates with a second hydraulic pressure inlet / outlet provided in the cylinder through a guide path constituted by a pipe, and that communicates with the second hydraulic pressure inlet / outlet, a first hydraulic pressure inlet / outlet that communicates with the rear hydraulic pressure chamber portion, and the front hydraulic pressure chamber portion; The basic means is that each of the hydraulic inlets and outlets communicates with an external hydraulic circuit. And
When the expansion / contraction body consisting of the cylinder and the piston cylinder extends in the external hydraulic circuit, the hydraulic oil in the front hydraulic chamber flows into the rear hydraulic chamber by merging with the hydraulic oil from the hydraulic pump. The hydraulic oil is configured to have an oil passage that partially flows in the tank leading to the front hydraulic chamber and the hydraulic pump, or the external hydraulic circuit is configured such that when the expansion and contraction formed by the cylinder and the piston cylinder extends, The hydraulic oil from the front hydraulic chamber and the second hydraulic chamber flows into the rear hydraulic chamber by merging with the hydraulic oil from the hydraulic pump, and when contracted, the hydraulic oil from the hydraulic pump flows into the second hydraulic chamber and the rear hydraulic chamber A hydraulic drive device that can perform expansion and contraction operation at high speed reliably by providing an oil passage in which a part of the hydraulic oil in the hydraulic chamber flows into the front hydraulic chamber and the other part flows into the tank communicating with the hydraulic pump. Can provide the cylinder's A drive cylinder that can perform crushing work smoothly and at high speed by providing an attachment means for the crusher body at the tip and an attachment means for the movable edge that forms the crushing blade together with the fixed blade at the tip of the piston cylinder. Can provide.

  According to the present invention, it is possible to provide a cylinder device that can perform an expansion and contraction operation at a high speed, has a high thrust, and can be provided with a hydraulic oil supply hose in a fixed manner, which is easy to use.

Explanatory drawing which shows a state when a piston cylinder extends of a 1st Example. Explanatory drawing at the time of the state which applied the load to the cylinder of 1st Example. Explanatory drawing which shows a state when a piston cylinder is contracted of the 1st Example. Explanatory drawing which shows a state when a piston pipe | tube is extended of 2nd Example. Explanatory drawing at the time of applying the load to the cylinder of 2nd Example. Explanatory drawing which shows a state when a piston cylinder is shrunk | reduced of 2nd Example. The schematic diagram which shows the state at the time of the crushing of a crusher. The schematic diagram which shows the state at the time of the crushing blade open | release of a crusher.

  As shown in FIGS. 7 and 8, the cylinder device A of the embodiment is applied for opening and closing the fixed blade 1 and the movable blade 2 of the crusher C, and is the base end of the cylinder 3 that is one end side of the cylinder device A. Is pivotally attached to the main body of the crusher C by means of a pin 4, while the other end of the piston cylinder 5 that enters and exits the cylinder 3 is pivotally attached to the movable blade 2 by means of a pin 4 '. When it is extended (when the piston cylinder 5 protrudes from the cylinder 3), the movable blade 2 is rotated in the direction of crushing the object to be crushed with the fixed blade 1 and contracted (into the cylinder 3 of the piston cylinder 5). The movable blade 2 is rotated in the direction when the crushing blade is opened.

  In the figure, 6 is a hydraulic chamber of the cylinder 3 in which the front hydraulic chamber 6a communicates with the external hydraulic circuit B through the third hydraulic inlet / outlet 14 and the rear hydraulic chamber 6b through the first hydraulic inlet / outlet 11, respectively. The cylinder 6 is slidably fitted into the chamber 6 from the distal end side of the cylinder 3 with the piston end 5a as a base end portion on the same axis, and the cylinder 3 constitutes a stretchable body. The device A is attached to the main body of the crusher as described above with the pin 4 using the assembly hole 8 (attachment means in the claims) provided in the base end portion 3a of the cylinder 3, and the distal end portion of the piston cylinder 5 The assembly hole 8 'provided in 5b (attachment means in the claims) is used to attach the movable blade 2 as described above with the pin 4'.

  An immovable piston 9 is slidably (relatively) fitted to the inner cavity of the piston cylinder 5 so as to be positioned at the tip end position of the cylinder 3, and the immovable piston 9 and the piston portion 5 a of the piston cylinder 5. The vacant space formed between the second hydraulic chamber 10 and the second hydraulic chamber 10.

  The stationary piston 9 constituting the second hydraulic chamber 10 is fixed to the base end portion 3a of the cylinder 3, that is, extends from the base end portion 3a of the cylinder 3, and the piston portion The second hydraulic chamber 10 is fixed to and supported by the distal end portion of the shaft tube 12 inserted into the piston cylinder 5 through 5a, and the second hydraulic chamber 10 is connected to the cylinder base end portion 3a via a guide path 13 constituted by the shaft tube 12. The second hydraulic pressure inlet / outlet 15 is communicated with the external circuit B in the same manner as the first hydraulic pressure inlet / outlet 11 and the third hydraulic pressure inlet / outlet 14. In addition, 80 shown in the figure is an air hole.

First embodiment

  The first hydraulic inlet / outlet 11 of the first embodiment communicates with a directional control valve 21 that communicates with the hydraulic pump P via the first hydraulic path 20 of the external circuit B, and also branches the first hydraulic path 20. The first branch path 22 provided in communication with the third hydraulic pressure inlet / outlet port 14 is provided with a pilot check valve 23 on the first branch path 22.

  The pilot check valve 23 is opened in the opening direction (the flow direction of hydraulic oil) by a pilot pressure applied through a pilot pipe line 23 ′ branched from a second hydraulic path 24 communicating with the second hydraulic chamber 10 through the second hydraulic pressure inlet / outlet 15. The hydraulic pressure (hydraulic fluid) discharged from the front hydraulic chamber 6a through the third hydraulic inlet / outlet 14 flows from the hydraulic tank T through the first hydraulic path 20 through the direction control valve 21. It joins with the hydraulic pressure (hydraulic oil) and is injected into the rear hydraulic chamber 6b of the hydraulic chamber 6.

  Further, the second hydraulic passage 24 that communicates the direction control valve 21 and the second hydraulic inlet / outlet 15 and the intermediate portion of the first branch passage 22 are communicated with each other through a relay passage 25, and on the relay passage 25, A check valve 27 and a control valve 28 arranged on the upstream side of the check valve 27 are arranged in series, and the control valve 28 detects and sets the oil pressure from the first hydraulic path 20 side through the detection path 28 '. The hydraulic oil is released when the hydraulic pressure reaches the specified value, and hydraulic oil from the third hydraulic pressure inlet / outlet 14 (front hydraulic pressure chamber 6a) is sent through the check valve 27 to the tank T through the direction control valve 21.

  Then, when the arm of the crusher C is operated and the crushing blade constituted by the fixed blade 1 and the movable blade 2 is opened, the crusher C is disposed at the position of the object to be crushed and the hydraulic pump P is operated. The hydraulic oil flows into the rear hydraulic chamber 6b from the first hydraulic inlet / outlet 11, and at this time, the hydraulic oil generated by the hydraulic pump P causes the entire amount of hydraulic oil to be injected into the rear hydraulic chamber 6b. The cylinder 5 receives it at the piston portion 5a, and the piston cylinder 5 moves forward.

  By the advance of the piston portion 5a, the hydraulic oil in the front hydraulic chamber portion 6a merges with the hydraulic oil from the hydraulic pump of the first hydraulic passage 20 through the first hydraulic passage 14 and the first branch passage 22 and the pilot check valve 23. After flowing into the rear hydraulic chamber 6b (the state shown in FIG. 1), the piston 5a, that is, the piston cylinder 5 is advanced at a high speed, and the movable blade 2 is rapidly rotated around the pin 4 '. The object to be crushed is sandwiched between 1 and crushed. The hydraulic oil in the second hydraulic chamber 10 in this process is discharged from the cylinder through the guide path 13 and the second hydraulic inlet / outlet 15 and is injected into the oil tank T through the second hydraulic path 24 (FIG. 2).

  When the operation of crushing (clamping) the object to be crushed by the fixed blade 1 and the movable blade 2 is finished, the forward operation along the cylinder 3 of the piston cylinder 5, that is, the piston portion 5a is restricted, and the hydraulic pressure in the rear hydraulic chamber 6b increases. Since the hydraulic pressure is received in the first hydraulic path 20, when the hydraulic pressure exceeds the set value, the control valve 28 is detected and opened through the detection path 28 ', and the relay path 25 is turned on. The hydraulic fluid from the front hydraulic chamber 6a flows to the relay path 25 side, and excess hydraulic oil is injected into the tank through which the hydraulic oil is drawn by the hydraulic pump P through the second hydraulic path 24 ( Figure 2).

  Then, after the crushing operation, the piston cylinder 5 is moved in the direction of the original position. In this movement operation, the hydraulic oil from the oil tank T passes through the second hydraulic path 24 through the hydraulic pump P and the direction control valve 21. This is performed by injecting into the second hydraulic chamber 10 from the second hydraulic inlet / outlet 15 via the guide path 13, and the pilot check valve 23 receives the injection pressure through the pilot pipe line 23 ′, and the first branch path 22 is moved in the other direction. The hydraulic oil in the rear hydraulic chamber 6b is discharged from the first hydraulic inlet / outlet 11 and passes through the first branch passage 22 branched from the first hydraulic passage 20 to the front hydraulic chamber 6a via the third hydraulic inlet / outlet 14. The hydraulic pressure (hydraulic fluid) stored and injected into the front hydraulic chamber 6a and the hydraulic pressure (hydraulic fluid) from the hydraulic pump P injected into the second hydraulic chamber 10 are loaded on the piston portion 5a and the piston cylinder 5 moves backward. Reduction Chijimitai is performed rapidly, each unit is to return to the original state (FIG. 3).

Second embodiment

  The first hydraulic inlet / outlet port 11 of the second embodiment shown in FIGS. 4 to 6 (the cylinder device A is the same as the first embodiment and is not shown) is connected to the hydraulic pump via the first hydraulic passage 20A of the external circuit B. The external circuit B includes first and second branch paths 22A and 29 provided by branching the first hydraulic path 20A in parallel, and communicates with the direction control valve 21A communicating with P. The first branch path 22A is communicated with the third hydraulic pressure inlet / outlet port 14, and a pilot check valve 23A is provided on the first branch path 22A.

  Similarly to the first branch path 22A, the second branch path 29 is provided with a pilot check valve 30 at an intermediate portion, and is connected to a relay path 25A connecting the first branch path 22A and the second hydraulic path 24A. It communicates on the downstream side of the check valve 31 installed.

  The pilot check valves 23A and 30 are opened by the same pilot pressure given through a pilot line 23'A branched from the second hydraulic path 24A communicating with the second hydraulic chamber 10 through the second hydraulic inlet / outlet 15. Direction (flowing direction of hydraulic oil), hydraulic oil (hydraulic) discharged from the second hydraulic chamber 10 through the second hydraulic inlet / outlet 15 and discharged from the front hydraulic chamber portion 6a through the third hydraulic inlet / outlet 14. The hydraulic oil (hydraulic pressure) merges with the hydraulic oil (hydraulic pressure) from the hydraulic tank T via the direction control valve 21 that flows through the first hydraulic path 20 through the pilot check valves 23A and 30 respectively, and is in the hydraulic chamber. 6 is injected into the rear hydraulic part 6b.

  A check valve 27A and a control valve 28A are arranged in parallel on the upstream side of the intermediate portion of the second hydraulic passage 24A that communicates the direction control valve 21A and the second hydraulic inlet / outlet 15, and the check valve 27A While restricting the flow of hydraulic oil only from the hydraulic pump P side to the cylinder side, the control valve 28A detects the hydraulic pressure from the first hydraulic path 20A side through the detection path 28'A and achieves the set hydraulic pressure amount. The check valve 27A is opened when the hydraulic oil flows from the second hydraulic inlet / outlet 15 (second hydraulic chamber 10) and the third hydraulic inlet / outlet 14 (front hydraulic chamber 6a) to restrict the flow of the hydraulic oil. , And the flow to the tank T through the direction control valve 21A.

  Then, as in the first embodiment, the hydraulic pump P is operated by operating the arm of the crusher C and disposing the crushing blade constituted by the fixed blade 1 and the movable blade 2 to the object to be crushed. As a result, the hydraulic oil in the oil tank T flows into the rear hydraulic chamber 6b from the first hydraulic inlet / outlet 11, and at this time, the entire amount of hydraulic oil is injected into the rear hydraulic chamber 6b by the hydraulic pressure generated by the hydraulic pump. As a result, the piston cylinder 5 receives it at the piston portion 5a, and the piston cylinder 5 moves forward.

  As the piston portion 5a moves forward, the hydraulic oil in the front hydraulic chamber 6a passes through the first hydraulic passage 14 through the first branch passage 22A and the second branch passage 29, and the hydraulic oil in the second hydraulic chamber 10 becomes the second hydraulic fluid. The hydraulic fluid from the hydraulic pump of the first hydraulic passage 20A is joined from the hydraulic inlet / outlet 15 through the relay passage 25A and the second branch passage 29 and flows into the rear hydraulic chamber portion 6b (state of FIG. 4), and the piston portion 5a, The piston cylinder 5 is advanced at high speed, the movable blade 2 is rapidly rotated around the pin 4 ′, the object to be crushed is sandwiched between the movable blade 2 and the fixed blade 1, and is crushed.

  When the operation of crushing (clamping) the object to be crushed by the fixed blade 1 and the movable blade 2 is finished, the forward operation along the cylinder 3 of the piston cylinder 5, that is, the piston portion 5a is restricted, and the hydraulic pressure in the rear hydraulic chamber 6b increases. Since the hydraulic pressure is received in the first hydraulic path 20A, when the hydraulic pressure exceeds the set value, the control valve 28A is detected and opened through the detection path 28'A, and the second hydraulic path 24A is opened. The hydraulic fluid from the second hydraulic chamber 10 and the front hydraulic chamber 6a flows to the second hydraulic passage 24A side, and excess hydraulic oil is removed by the hydraulic pump P through the second hydraulic passage 24A. It will be poured into the tank to be withdrawn.

  Then, after the crushing operation, the piston cylinder 5 is moved in the direction of the original position. In this moving operation, the hydraulic oil from the oil tank T passes through the second hydraulic path 24A through the hydraulic pump P and the direction control valve 21A. This is performed by injecting the second hydraulic pressure inlet / outlet 15 through the guide path 13 into the second hydraulic chamber 10, and the pilot check valve 23A receives the injection pressure through the pilot pipe line 23′A and passes through the first branch path 22A in the other direction. The hydraulic oil in the rear hydraulic chamber 6b is discharged from the first hydraulic inlet / outlet 11, passes through the first branch passage 22A branched from the first hydraulic passage 20A, and passes through the third hydraulic inlet / outlet 14 to the front hydraulic chamber 6a. The hydraulic pressure (hydraulic oil) injected into the front hydraulic chamber 6a and the hydraulic pressure (hydraulic fluid) from the hydraulic pump P injected into the second hydraulic chamber 10 are loaded on the piston portion 5a, and the piston cylinder 5 Reduction of recession i.e. elastics are performed rapidly, each unit is to return to the original state (FIG. 3).

3 cylinder 5 piston cylinder 5a piston portion 6 hydraulic chamber 6a front hydraulic chamber portion 6b rear hydraulic chamber portion 9 stationary piston 10 second hydraulic chamber portion 11 first hydraulic chamber inlet / outlet 12 shaft pipe 13 guide path 14 third hydraulic inlet / outlet 15 second Hydraulic doorway

Claims (3)

A piston cylinder having a base end portion as a piston portion is slidably fitted into the hydraulic chambers constituting the front and rear hydraulic chamber portions of the cylinder, and the stationary piston is extended from the base portion of the cylinder by being relatively slid into the piston cylinder. And a second hydraulic chamber is provided between the stationary piston and the piston portion, the second hydraulic chamber being provided between the fixed piston and the piston portion through the piston portion. A third hydraulic pressure port that communicates with a second hydraulic pressure inlet / outlet provided in the cylinder through a guide path constituted by a pipe, and that communicates with the second hydraulic pressure inlet / outlet, a first hydraulic pressure inlet / outlet that communicates with the rear hydraulic pressure chamber portion, and the front hydraulic pressure chamber portion; each hydraulic doorway Rutotomoni, the external hydraulic circuit, when the telescopic body cylinder and the piston cylinder is formed by extending the front to the rear hydraulic chamber working oil in the hydraulic chamber is in communication with the external hydraulic circuit, operating from the hydraulic pump Join with oil Are included, it was also the one having an oil passage through one portion each tank rear hydraulic chamber hydraulic oil is communicated to the hydraulic pump and the front hydraulic chamber when contracted, the hydraulic cylinder device. When the expansion / contraction body made up of the cylinder and the piston cylinder extends, the hydraulic oil in the front hydraulic chamber and the second hydraulic chamber flows into the rear hydraulic chamber, merges with the hydraulic oil from the hydraulic pump, and contracts. The hydraulic fluid from the hydraulic pump flows into the second hydraulic chamber, and the hydraulic fluid in the rear hydraulic chamber is provided with an oil passage in which part of the hydraulic oil flows into the front hydraulic chamber and the other part into the tank communicating with the hydraulic pump. , Hydraulic cylinder device. The hydraulic cylinder device according to claim 1 or 2, wherein means for attaching to the crusher body is provided at the base of the cylinder, and means for attaching to the movable blade constituting the crushing blade together with the fixed blade is provided at the tip of the piston cylinder.

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