KR100447430B1 - low pressure control device for oil pressure engine pump - Google Patents

Abstract

The present invention relates to a hydraulic engine pump for supplying low pressure / high pressure oil pressure to life-saving equipment using hydraulic pressure, and includes two sets of hydraulic pumps that simultaneously generate high pressure and low pressure in a hydraulic pump driven by an engine of the hydraulic engine pump. It is designed to drive lifesaving equipment, but at the same time supplying low pressure and high pressure oil, cutting or crushing, that is, sending low pressure oil from the low pressure pump to lifesaving equipment at the time of needing great force. Instead, it is to provide a low pressure interrupter of the hydraulic engine pump for life-saving equipment to bypass the oil tank so that the engine of the hydraulic engine pump is not overloaded.

Description

Low pressure control device for hydraulic engine pump for lifesaving equipment {low pressure control device for oil pressure engine pump}

The present invention relates to a hydraulic engine pump for supplying low / high pressure hydraulic pressure to lifesaving equipment using hydraulic pressure.

More specifically, two sets of hydraulic pumps for generating high pressure and low pressure in the hydraulic pump driven by the engine of the hydraulic engine pump are used to drive the life-saving equipment. Lifesaving plant that bypasses the engine of the hydraulic engine pump by bypassing the low pressure oil generated from the low pressure pump to the lifesaving equipment at the time of needing large force. To provide a low pressure interrupter for a cost hydraulic engine pump.

In general, accident scenes such as building fires, building collapses, and vehicle accidents require the use of life-saving equipment to rescue buryers and trapped people to cut or crush obstacles to secure access roads.

The lifesaving equipment 6a and 6b as described above are driven by hydraulic pressure as shown in FIG. 1 and the hydraulic pressure is driven by the hydraulic engine pump 1 in which the engine 5 and the hydraulic pump are integrally mounted. To generate and supply.

The hydraulic engine pump 1 is provided with two sets of hydraulic pumps and a hydraulic hose 4 to simultaneously drive two lifesaving equipments 6a and 6b as shown in the accompanying drawings. The oil tank 2 and the cover 3 are integrally formed on one side of the body frame, and the oil tank 2 is mounted inside the cover 3 so that the hydraulic pump block 8 is locked in the oil tank 2, and the cover ( An engine shaft 5a is mounted on the hydraulic pump block 8 by passing an engine shaft 5a through which the driving force of the engine 5 is transmitted to the center of 3). 7) to control the oil distribution of high pressure and low pressure.

The hydraulic pump block 8 and the valve block 7 are connected to two sets of supply lines 9a and 9b for supplying hydraulic pressure, and the valve block 7 is connected to the lifesaving equipment 6a and 6b. It is provided with a supply port (10a) (10b) to connect the hydraulic hose (4) for supplying, and on one side of the supply port (10a) (10b) is provided with a recovery port (11a) (11b) for the recovery of hydraulic pressure The inner side of the recovery ports 11a and 11b communicates with the inner side of the cover 3 to circulate the hydraulic circuit so that the recovered oil is stored in the oil tank 2.

The hydraulic pump block 8 is equipped with two sets of high pressure pumps 13a and 14a and low pressure pumps 14b and 14b for generating high pressure and low pressure, and the high pressure pump 13a and 14a and the low pressure. The pumps 14b and 14b are oil pumps for repeating suction and discharge of oil by reciprocating the pistons, and the pistons of the pumps are adapted to the restoring force of the cam 12 and the spring mounted at the end of the engine shaft 5a. By reciprocating motion.

In the hydraulic pump block 8 is formed a flow path in each direction for supplying oil of high pressure and low pressure, the present invention provides a structure for intermittent the flow of low pressure oil in the hydraulic pump block (8). It is.

A configuration of a conventional hydraulic pump block will be described with reference to FIG. 3B.

The conventional hydraulic pump block is equipped with two sets of high pressure pumps 13a and 14a and low pressure pumps 13b and 14b for generating high pressure and low pressure oil pressures in front of the hydraulic pump block. In the state, it is simply configured to be joined to the inside of the hydraulic pump block and supplied to the life-saving equipment 6a, 6b.

Most of the lifesaving equipment 6a, 6b is to cut, shred, or separate the object so that the cutting blade is moved more rapidly and the cutting blade is broken and substantially broken while the cutting blade is brought closer to the object for cutting. At this point, you need more power than rapid movement.

By supplying high pressure and low pressure at the same time, low pressure sends a large flow rate to move the cutting blade quickly, and high pressure supplies high pressure and low pressure simultaneously for the purpose of applying a large force instead of sending a small flow rate. In the pump, the engine is overloaded when a large force is applied, and the engine 5 is stopped due to the overload.

In more detail, the engine continues to drive the high pressure pump and the low pressure pump while rotating at the same speed rpm, and from the moment the cutting is performed, the resistance is applied to the cutting blade of the lifesaving equipment, so the resistance acts as an overload of the engine. This overload is caused by stopping the engine, especially by a low pressure pump.

In other words, the cutting blade moves at a very slow speed, cutting or crushing the object. As the moving speed is slow, a large flow rate is not necessary. The low pressure pump continuously emits the same flow rate / hydraulic pressure, The low pressure pump is not pumped, and the low pressure pump is not pumped smoothly, thereby overloading the engine and stopping the engine.

In addition, it is pointed out that by continuously applying pressure to the oil that does not flow smoothly, high temperature heat is generated in the hydraulic pump block, and the life of the oil and the life of the hydraulic engine pump are shortened by the generated heat.

The present invention is to provide a low pressure interruption device of a hydraulic engine pump for lifesaving equipment to solve the above problems.

The present invention is to supply only the high pressure oil when cutting, crushing or separating the life-saving equipment by hydraulic pressure, the low pressure oil is bypassed in the hydraulic pump block, the high pressure and It is an object of the present invention to provide a low pressure interruption device for a hydraulic engine pump for lifesaving equipment to supply low pressure at the same time so that the engine is not overloaded.

Another object of the present invention is to provide a low pressure interruption device for a hydraulic engine pump for lifesaving equipment so as not to overload the engine so that the engine does not stop while driving the lifesaving equipment to continuously carry out lifesaving.

Another object of the present invention is to minimize the heat generated by the stagnation of the hydraulic pressure in the hydraulic pump block to suppress the heat generated by the pressure applied to the oil of low pressure to extend the life of the oil and furthermore the hydraulic engine It is to provide a low pressure interruption device of a hydraulic engine pump for lifesaving equipment to extend the life of the pump.

1 is a perspective view showing a lifesaving equipment and a hydraulic engine pump

2 is an exemplary view showing the hydraulic pump extracted from the hydraulic engine pump

Figure 3a is a perspective view showing an extract of the hydraulic pump block of the hydraulic pump according to the present invention

3b is an exploded view of the hydraulic pump block of the hydraulic pump according to the present invention

Exploded perspective view

Figure 4 is a cross-sectional view of the assembled hydraulic pump block of the hydraulic pump according to the invention

5a and 5b of the low pressure control device of the hydraulic engine pump according to the present invention

As a cross-sectional view for explaining the operating relationship

5a shows a normal supply state of the low pressure oil in the low pressure control device,

5b shows a bypass state of the low pressure oil in the low pressure interrupter.

Explanation of symbols on the main parts of the drawings

1: hydraulic engine pump 2: oil tank 3: cover

4: hydraulic hose 5: engine 6a, 6b: life-saving equipment

7: valve block 8: hydraulic pump block 9a, 9b: supply line

10a, 10b: supply port 11a, 11b: recovery port 12: cam

13a, 14a: high pressure pump 13b, 14b: low pressure pump 15: first set hydraulic supply port

16: 2nd set hydraulic supply port 17, 18: Oil interlocking bolt 19, 20: Valve bolt

21, 22: Taps for mounting the high pressure pump 23, 24: Check valve housing

25, 26, 35, 36: oil suction hole 27, 28, 37, 38: check valve

29, 30: high pressure oil path 31, 32: tap for mounting the low pressure pump

33, 34: check valve storage 39, 40: low pressure oil euro

41, 42: low pressure oil distribution control passage 43, 44: low pressure oil bypass unit

45, 46: bypass passage 47, 48: low pressure oil outlet

49: spool 50: sealing 51: head

52: packing 53: sealing

54: head 55: external thread 56: stop part

57: step 58: packing 59: sealing

60: lower portion 61: annular groove 62: oil inlet distribution hole

63: oil discharge distribution hole 64: low pressure oil interruption part 65: distribution hole

66: spool storing portion 67: female thread 68: spring

70: pressure setting screw 71: finishing screw

72: ball 73: anchor 74: spring

75: spring guide rod 76: blocking bolt

The above objects and features of the present invention will be more clearly understood by the following detailed description based on the accompanying drawings.

Accompanying drawings Figure 3a is a perspective view showing the hydraulic pump block of the hydraulic pump according to the invention, Figure 3b is an exploded perspective view showing the hydraulic pump block of the hydraulic pump according to the invention, Figure 4 is in accordance with the present invention 5A and 5B are cross-sectional views illustrating the operation relationship of the low pressure control device of the hydraulic engine pump according to the present invention. FIG. 5A shows the normality of the low pressure oil in the low pressure control device. 5b shows a bypass state of the low pressure oil in the low pressure interrupter.

The present invention forms a low pressure oil flow control intermittent flow path 43 on one side of the low pressure pump 13b, 14b to automatically control the flow of low pressure oil in the conventional hydraulic pump block 8, and has a check valve function. The oil intermittent bolt 17 is fastened, and the low pressure supply passage 39 of the low pressure oil has a check valve function. The other components are the same as those of the conventional hydraulic engine pump, and the detailed description of the same parts is omitted. The same components will be described with the same reference numerals.

3A and 3B, check valve receiving holes 23, 24, 33, 34 are formed on the front surface of the hydraulic pump block 8 in a square direction around the engine shaft 5a. A pair of tabs 21, 22, 31, and 32 are formed on both sides of the check valve accommodation holes 23, 24, 33, 34 so that the check valve accommodation holes 23, 24, 33 are 33. (34) inserts a conventional check valve assembly (not shown), and a pair of tabs (21) (22) (31) (32) and two sets of conventional high pressure pumps (13a) (14a) and low pressure The pumps 13b and 14b are fastened and mounted.

That is, two sets of high pressure pumps and a low pressure pump are mounted, but the first set of high pressure pumps 13a and the second set of high pressure pumps 14a face each other, and the first set of low pressure pumps 13b and the first set The low-pressure pump 14b of two sets is fastened so that it may oppose.

The first set and the second set are composed of the same configuration and there is only a difference in which only the direction in which the high pressure / low pressure hydraulic pressure is discharged is formed in an upward direction, and the following description focuses on the first set.

The high pressure pump 13a is pumped by the restoring force of the cam 12 and the spring to form an oil suction hole 25 in the side of the hydraulic pump block 8, and at the end of the oil suction hole 25 It is provided with a check valve 27 to suppress the back flow of oil, to form a high-pressure supply passage 29 in the upward direction to communicate with the oil flow path of the oil suction hole 25 and the high pressure pump 13a, the high pressure supply passage A first set hydraulic supply port 15 is formed at the end of the 29 to mount the supply line 9a.

In the high pressure supply passage 30 communicating with the second set of high pressure pumps 14a, a second set hydraulic supply port 16 is formed at an end thereof, and a supply line 9b is mounted.

The pump 12 is pumped by the restoring force of the cam 12 and the spring of the low pressure pump 13b to form an oil suction hole 35 on the upper surface of the hydraulic pump block 8, and an end of the oil suction hole 35. It has a check valve 37 to suppress the back flow of oil, and to form a low pressure supply passage 39 to the left to communicate with the oil flow path of the oil suction hole 35 and the low pressure pump 13b, A low pressure oil control passage 41 is formed at the outer end of the flow passage 39 so as to communicate with the high pressure supply passage 29, and the diameter of the low pressure oil control passage 41 is larger than the diameter of the low pressure supply passage 39. By tightening the valve bolt 19 to be described later to provide a check valve function to one side of the low pressure oil intermittent flow passage (41).

On the one end of the oil suction hole 35, the bypass passage 45 is formed horizontally in the left direction so as to communicate with the oil suction hole 35, and the blocking bolt 76 is formed at the end of the bypass passage 45. The end is closed by tightening.

A low pressure oil bypass portion 43 is formed in the vertical direction so as to communicate the bypass passage 45 and the low pressure supply passage 39, and a tab 43a is formed at an end of the low pressure oil bypass portion 43. By tightening and fixing the oil intermittent bolt 17 to be described later.

A discharge port 47 communicating with the front side of the hydraulic pump block 8 is formed at one lower end side of the low pressure oil bypass 43.

The oil intermittent bolt 17 is provided with a check valve function therein and a spool 49 at the bottom as shown in FIGS. 3B and 4.

That is, at the upper end of the oil lock bolt 17, a head 54, such as a general bolt head, is formed, and a male screw 55 is formed below the head 54, and a male screw 55 is disposed below the male screw 55. To form a stop portion 56 having a diameter smaller than the rib diameter, and to form a lower end portion 60 which is divided into the stepped portion 57 below the interruption portion 56, the outer diameter of the lower portion 60 is the interruption portion 56. It is formed smaller than the outer diameter of).

The oil inlet flow hole 62 is formed in the stop portion 56 in the radial direction, and the packing 58 and the sealing 59 are provided on the upper side of the stepped portion 57, and the lower side of the stepped portion 57. In the annular groove 61 is formed, the annular groove 61 is formed by drilling an oil discharge distribution hole 63 in the radial direction.

The lower end of the lower end 60 is provided with a normal packing, and the inner side of the bottom is formed with a spool accommodating portion 66 to accommodate the spool 49 described later.

An oil interruption portion 64 is formed in a through shape in the oil interruption bolt 17, a female screw 67 is formed at an outer end of the oil interruption portion 64, and an inner center of the oil interruption portion 64 is formed. The distribution hole 65 is formed to have a diameter smaller than the inner diameter of the oil interruption portion 64, but the distribution hole 65 is formed to communicate with the spool storing portion 66.

The spool 49 has a packing 52 and a sealing 53 in a round and flat head 51 having a tack shape, and integrally protrudes a seal 50 on the upper side. The outer diameter of 50 is formed to be much smaller than the inner diameter of the distribution hole 65 so that the seal 50 is inserted into the spool storing portion 66 so as to face the distribution hole 65.

The oil control unit 64 of the oil control bolt 17 is provided with a check valve and a pressure control unit so that the ball 68 and the spring 69 are sequentially inserted into the oil control unit 64, and the pressure setting screw ( 70 is fastened to the female screw 67 to adjust the degree of tightening to set the spring (69) pressure, it is to fasten the finishing screw 71 to the outside of the pressure setting screw (70).

The low pressure oil flow control flow passage 41 formed at one side of the hydraulic pump block 8 has a check valve function, and the ball 72, the casing 73, and the spring 74 are sequentially inserted into the spring guide. A valve bolt 19 integrally formed with 75 is fastened to an end portion of the low pressure oil flow control flow passage 41.

The spring guide 75 is a spring 74 and the fitting 73 is inserted into the bucket 73 to push the ball 72 by the restoring force of the spring 74 and the ball 72 is a low pressure oil flow It is to block / pass the flow of oil between the intermittent flow passage 41 and the low pressure supply flow passage 39.

Hereinafter, an operation relationship will be described with reference to FIGS. 5A and 5B.

When the hydraulic engine pump 1 is started, the engine 5 is operated, and the engine shaft 5a rotates the cam 12 to drive the high pressure pump 13a, 14a and the low pressure pump 13b, 14b. To pump the oil.

When the high pressure pumps 13a and 14a are driven, oil is sucked through the check valves 27 and 28 and the oil suction holes 25 and 26 to be discharged and discharged toward the high pressure supply passages 29 and 30. The high pressure oil supplies the high pressure oil to the lifesaving equipment 6a and 6b through the first set hydraulic supply port 15 and the second set hydraulic supply port 16.

When the low pressure pumps 13b and 14b are driven, oil is sucked through the check valves 37 and 38 and the oil suction holes 35 and 36 to be discharged and discharged toward the low pressure supply passages 39 and 40. The low pressure oil is mixed with the high pressure oil in the low pressure oil flow control flow passages 41 and 42 and the lifesaving equipment 6a through the first set hydraulic supply port 15 and the second set hydraulic supply port 16. 6b) is supplied with high pressure and low pressure oil at the same time.

5A is a cross-sectional view showing an initial state in which the hydraulic engine pump 1 is operated.

The high pressure oil is discharged through the high pressure supply passages 29 and 30, and the low pressure oil is mixed with the oil of the high pressure supply passages 29 and 30 through the low pressure supply passages 39 and 40, A portion of the oil is introduced into the low pressure oil bypass portion 43 through the bypass passage 45, and the introduced oil is introduced into the oil interruption portion of the oil interruption bolts 17 and 18 through the oil inflow distribution hole 62. 64, the ball 68 is brought into close contact with the flow hole 65 by the low pressure oil and the restoring force of the spring 69 to keep the flow hole 65 closed.

As for the spool 49, the seal 50 is in close contact with the lower end of the ball 68 through the flow hole 65, so that the upper surface of the head 51 maintains a space formed on the inner surface of the spool storage 66. do.

When the low pressure oil passes through the low pressure supply flow passage 39, the oil is pushed to the ball 72 at its own pressure and flows into the secured space, and the ball 72 is pushed simultaneously with the tub 73 to press the spring 74. It is.

The cutting blade of life-saving equipment (6a) and (6b) is closed or opened by continuous hydraulic engine pump (1) operation, and the cutting blade is supplied because oil mixed with high pressure and low pressure is supplied until the object is bitten. Is to move quickly.

A large force is required from the actual cutting, crushing, or opening between the gaps, and a load is applied to the movement of the cutting blade, and this load is a high pressure pump 13a, 14a and a low pressure pump 13b. Is passed to 14b.

As the load is applied, the flow of oil is not smooth, thereby increasing the pressure in each flow path in the hydraulic pump block 8.

At this time, when the pressure rises to a pressure higher than the set pressure, the oil of high pressure in the low pressure oil flow control flow passages 41 and 42 becomes higher than the set pressure and eventually higher than the pressure of the low pressure oil so that the ball 72 becomes the low pressure supply passage 39 ( The outlet of the 40 is closed and the pressure in the low pressure supply passages 39 and 40 is increased by closing the outlet of the low pressure supply passage 39. The pressure of the low pressure thus pushed up the spool 49, By moving the ball 49, the ball 68 is pushed up to open the inlet of the distribution hole 65, and the oil of low pressure introduced through the bypass passages 45 and 46 is introduced into the oil inlet distribution hole 62. And it passes through the open hole 65 and the oil discharge distribution hole 63 and then sent back to the oil tank (2) through the discharge port (68, 69).

Eventually, from the time when the load is applied, only high pressure oil is supplied to the life-saving equipment 6a, 6b to transmit a large force at a low flow rate, and a large amount of low pressure oil generated in the low pressure pumps 13b and 14b is generated. At the same time it is withdrawn immediately will not overload the engine (5).

When the overload is released by the restoring force of the spring 69, the ball 68 closes the inlet of the flow hole 65 and at the same time sends down the spool 49.

In addition, the low pressure oil pushes the ball 72 blocking the outlet of the low pressure supply flow passage 39 and 40 and is mixed with the high pressure oil to supply the high pressure and low pressure oil to the lifesaving equipment 6a and 6b. Will be.

Although specific embodiments have been described in the present invention, it will be apparent to those skilled in the art that various changes and modifications can be made within the technical scope of the present invention, and such modifications and modifications belong to the appended claims.

The low pressure control device of the hydraulic engine pump for lifesaving equipment according to the present invention supplies the high pressure and the low pressure at the same time in the initial state, and supplies only the high pressure oil at the time of performing cutting, crushing or separation, and at the same time, the low pressure oil. Is bypassed in the hydraulic pump block so that the engine is not overloaded.

Therefore, it is possible to continuously carry out lifesaving by not overloading the engine so that the engine does not stop while driving the lifesaving equipment.

In addition, by minimizing the heat generated by the stagnation of the hydraulic pressure in the hydraulic pump block inherently suppresses the heat generated by the pressure applied to the oil of low pressure to extend the life of the oil and further extend the life of the hydraulic engine pump It can be done.

Claims (4)

The high pressure pump and the low pressure pump, which rotate the cam by the power of the engine and generate the high and low pressure by the driving force of the cam and the restoring force of the spring, are mounted on the hydraulic pump block to supply the high pressure and low pressure generated to the life-saving equipment. In the hydraulic engine pump, The bypass passage 45 is formed at the stop of the oil suction holes 35 and 36 of the oil sucked into the low pressure pump, and the low pressure supply passages 39 and 40 are disposed at the lower ends of the oil suction holes 35 and 36. Form and communicate with the high-pressure supply passage (29) (30), The low pressure oil bypass portions 43 and 44 are formed to simultaneously communicate the bypass passage 45 and the low pressure supply passages 39 and 40, and on one side of the low pressure oil bypass portions 43 and 44. The discharge ports 47 and 48 are formed so as to communicate directly with the oil tank 2, The low pressure oil flow control flow passage 41 communicates with the high pressure supply flow passages 29 and 30 at the outlet side of the low pressure supply passages 39 and 40 and has a check valve function by the ball 72 and the spring 74. Form the The low pressure oil bypass unit 43, 44 has a check valve and a pressure setting function by the spring 69 and the ball 68, and the lower end has a spool 49 which is moved by a pressure value. Low pressure control device of the hydraulic engine pump for life-saving equipment, characterized in that the fastening of the oil intermittent bolt 17 to control the flow of oil by opening or closing the distribution hole 65 by the movement of (49). The method according to claim 1, The ball 72, the tub 73, and the spring 74 are sequentially inserted into the low pressure oil flow control flow passage 41, and the valve bolts 19 and 20 formed with the spring guide 75 are fastened to the ball. 72 is a hydraulic engine for lifesaving equipment, characterized in that configured to open or close the outlet of the low pressure supply passage 39, 40 in communication with the low pressure oil flow control intermittent passage 41 in accordance with the internal pressure change. Low pressure interrupter of pump. The method according to claim 1, The oil intermittent bolt 17 forms a head 54 such as a general bolt head on the upper end, and forms a male screw 55 under the head 54, and a male screw 55 under the male screw 55. To form a stop portion 56 having a diameter smaller than the rib diameter of the, and to the lower side of the stop portion 56 to form a lower end 60 which is divided into a step (57), the outer diameter of the lower end 60 is the stop portion ( Formed smaller than the outer diameter of 56), The oil inlet flow hole 62 is formed in the stop portion 56 in the radial direction, and the packing 58 and the sealing 59 are provided on the upper side of the stepped portion 57, and the lower side of the stepped portion 57. In the annular groove 61 is formed, the annular groove 61 is formed by drilling an oil discharge distribution hole 63 in the radial direction, The lower end of the lower portion 60 is provided with a normal packing, the inner side of the bottom formed with a spool storing portion 66, An oil interruption portion 64 is formed in the through shape in the inside, and an internal thread 67 is formed at an outer end of the oil interruption portion 64, and an oil interruption portion 64 is formed at the inner center of the oil interruption portion 64. Low pressure regulator of the hydraulic engine pump for life-saving equipment, characterized in that the distribution hole (65) is formed to a diameter smaller than the inner diameter of the distribution hole (65) is configured to communicate with the spool housing (66). The method according to claim 1, The spool 49 is provided with a packing 52 and a sealing 53 in a round and flat head 51 in a tack shape, and integrally protrudes a seal 50 on the upper side thereof. The outer diameter of 50 is formed to be much smaller than the inner diameter of the distribution hole 65 so that the seal 50 is inserted into the spool storage portion 66 so as to face the distribution hole 65, Low pressure control device of the hydraulic engine pump for life-saving equipment, characterized in that the upper end of the seal 50 is configured to contact the lower end of the ball 68 provided in the oil intermittent portion (64).