NL2027986B1

NL2027986B1 - Rescue cutting-spreading plier and control system thereof

Info

Publication number: NL2027986B1
Application number: NL2027986A
Authority: NL
Inventors: Li Zheng; An Lingmin; Qui Hailiang
Original assignee: Yantai Aidi Prec Machinery Co Ltd
Priority date: 2020-09-28
Filing date: 2021-04-16
Publication date: 2022-03-11
Also published as: CN112060001B; CN112060001A

Abstract

Provided is a rescue cutting—spreading plier, including a control mechanism, an oil circuit switching mechanism, a rotary control mechanism, a cutting—spreading mechanism.and a. jacking‘ mechanism. ZHi oil separator‘ of the cutting— spreading mechanism includes a core body and a main body. A first control valve block is provided on the core body of the oil separator. Two first hydraulic cylinders are mounted symmetrically on both sides of a housing. One end of each of the two first hydraulic cylinders is hinged with an upper end of the housing through a first pin shaft, and the other end of each of the two first hydraulic cylinders is hinged with an ear hole of a corresponding cutting por— tion through a corresponding second pin shaft. A corner of the each of the two cutting portions provided with a con— necting hole is hinged with a lower end of the housing through a corresponding third pin shaft. The two first hydraulic cylinders are connected. to the oil separator through oil passages. The cutting portion simultaneously has functions of cutting, dismantling‘ and. spreading. ‚A front end at an inside of the cutting portion is configured to crush obstacles, like concrete. Blades of the cutting portion are configured to cut and separate steel bars from the concrete.

Description

RESCUE CUTTING-SPREADING PLIER AND CONTROL SYSTEM THEREOF

TECHNICAL FIELD This application relates to accessories of rescue engineer- ing machines, and more particularly to a rescue cutting- spreading plier and a control system thereof.

BACKGROUND Earthquake is a suddenly-occurring disaster with huge dam- age and extensive impact. China is located between the Circum-Pacific seismic zone and the Eurasian seismic zone, where the seismic fault zone is very active due to the compression of the Pacific plate, the Indian plate and the Philippine Sea plate. Currently, buildings are mostly re- inforced concrete buildings with high heights and multiple floors, and once an earthquake occurs, a large number of beams and prefabricated slabs are left on top of each other. Unfortunately, the traditional small manual rescue tools, such as hydraulic spreaders, hydraulic jacks and crack openers, fail to provide a sufficient force, leading to a poor rescue efficiency. As for the engineering machines, they have desired capacity to handle large concrete blocks, facilitating improving the efficiency of the emergency res- cues. However, the existing large engineering machines are operated mainly based on a single-function accessory, and this accessory is generally applied to the earthwork engi- neering with a non-rescue purpose. In addition, they also have poor environmental adaptability, time-consuming switching operation, low accuracy and stability and poor rescue applicability, and have a relatively poor coupling technology, thereby missing the best rescue time. There- fore, it is required to develop a multi-functional rescue tool according to characteristics of emergency rescue and various operating environments to better meet different rescue needs.

SUMMARY

In view of the above problems in the prior art, an object of the present disclosure is to provide a rescue cutting- spreading plier and a control system thereof.

Based on extensive researches on cutting and spreading operations and coupling technology of accessories in practical rescue operations, the present disclosure provides a cutting- spreading integrated rescue accessory and a mechanics-elec- tronics-hydraulics integrated control system.

Technical solutions of the present disclosure are described as follows.

Provided is a rescue cutting-spreading plier, comprising: a control mechanism; an oil circuit switching mechanism; a rotary control mechanism; a cutting-spreading mechanism; and a jacking mechanism; wherein the cutting-spreading mechanism comprises a first control valve block, an oil separator, two first pin shafts, two first hydraulic cylinders; two second pin shafts, a housing, two third pin shafts, two cutting por- tions, two spreading jaws and two blades; the housing is configured for arrangement of a spreading portion; the oil separator comprises a core body and a main body; the main body is sleeved on the core body; the main body and the core body are rotatable in relation to each other; the first control valve block is provided on the core body of the oil separator; the main body is provided on an end inside the housing; the two first hydraulic cylinders are mounted symmetrically on both sides of the housing; one end of each of the two first hydraulic cylinders is hinged with an upper end of the housing through the corresponding first pin shaft, and the other end of each of the two first hydraulic cylinders is hinged with a lug hole of the cor- responding cutting portion through the corresponding second pin shaft; the two cutting portions are triangular, and three corners of each of the two cutting portions are pro- vided with the lug hole, a connecting hole and a spreading jaw mounting groove, respectively; the corner of each of the two cutting portions provided with the connecting hole is hinged with a lower end of the housing through the corresponding third pin shaft; the corner of the each of the two cutting portions provided with the connecting hole is a rounded corner and the rounded corner is provided with a serrated structure; each of the two spreading jaws is mounted on the spreading jaw mounting groove of the corre- sponding cutting portion through a fastening bolt and a limit sleeve; each of the two blades is mounted on an end face of the longest side of the corresponding triangular cutting portion through the fastening bolt and the limit sleeve; and the two first hydraulic cylinders are connected to the oil separator through oil passages.

In an embodiment, the rotary control mechanism comprises a box body, a hydraulic gerotor motor, a second control valve block and a slewing bearing; wherein the hydraulic gerotor motor and the second control valve block are provided in- side the box body; the slewing bearing is provided on an outer side of the box body; the second control valve block is provided on the hydraulic gerotor motor; an output end of the hydraulic gerotor motor is provided with a meshing pinion; the meshing pinion is provided on the outer side of the box body; the meshing pinion is meshed with a ro- tating ring gear of the slewing bearing; the housing is fixedly connected to the rotating ring gear of the slewing bearing; the core body is fixed on the box body; an upper end of the core body is located in the box body, and a lower end of the core body is located in the housing; and the core body 1s provided at a center of the slewing bear- ing.

In an embodiment, the jacking mechanism comprises a second hydraulic cylinder; a support block is fixedly provided on a piston rod of the second hydraulic cylinder; the second hydraulic cylinder is fixedly provided inside the housing; the second hydraulic cylinder and the oil separator are provided at both ends of a fixed base; the second hydraulic cylinder is connected to the oil separator through oil passages; and the support block is configured to fixedly clamp edges of the two blades.

In an embodiment, an upper end of the housing is provided with two groups of outreached hinged lugs, and each of the two groups of outreached hinged lugs consists of two hinged lugs; each group of hinged lugs is hinged with the corre- sponding first hydraulic cylinder; a lower end of the hous- ing is provided with two anti-wear plates; and an end of each of the two cutting portions provided with the connect- ing hole is inserted between the two anti-wear plates and is hinged with the two anti-wear plates.

In an embodiment, the control mechanism comprises a first valve body, a first O-type three-position four-way direc- tional control valve, a second O-type three-position four- way directional control valve and a Y-type three-position four-way directional control valve, wherein the first 0O- type three-position four-way directional control valve, the second O-type three-position four-way directional control valve and the Y-type three-position four-way directional control valve are mounted on the first valve body; the first valve body is configured to divide two oil passages into six oil passages and is provided with a pressure re- ducing valve; two of the six oil passages are communicated with the two first hydraulic cylinders through the first O-type three-position four-way directional control valve, the first control valve block and the oil separator; two of the six oil passages are communicated with the second hydraulic cylinder through the second O-type three-position four-way directional control valve, the first control valve block and the oil separator; and the last two of the six oil passages are communicated with the hydraulic gerotor motor through the Y-type three-position four-way direc- tional control valve and the second control valve block.

In an embodiment, the first valve body is fixedly provided on the box body through a holder.

In an embodiment, the oil circuit switching mechanism com- prises a connecting base, a second valve body and a male quick plug-in connector; a lower end of the connecting base is connected to the box body of the rotary control mecha- nism; the male quick plug-in connector is mounted on the second valve body; the second valve body is fixedly pro- vided on the connecting base; and the second valve body is 5 connected to the first valve body through a pipeline.

In an embodiment, a limit block is fixedly provided on a side wall of the main body of the oil separator; and the limit block is fixedly connected to the housing.

The present disclosure further provides a control system of the above rescue cutting-spreading plier, comprising a first valve body, a first O-type three-position four-way directional control valve, a second O-type three-position four-way directional control valve and a Y-type three-po- sition four-way directional control valve; wherein the first O-type three-position four-way directional control valve, the second O-type three-position four-way direc- tional control valve and the Y-type three-position four- way directional control valve are mounted on the first valve body; the first valve body is configured to divide two oil passages into six oil passages, and is provided with a pressure reducing valve; two of the six oil passages are communicated with the two first hydraulic cylinders through the first O-type three-position four-way direc- tional control valve A, the first control valve block and the oil separator; two of the six oil passages are commu- nicated with the second hydraulic cylinder through the sec- ond O-type three-position four-way directional control valve, the first control valve block and the oil separator; and the remaining two of the six oil passages are communi- cated with the hydraulic gerotor motor through the Y-type three-position four-way directional control valve and the second control valve block.

In an embodiment, the control system further comprises a second valve body with a male quick plug-in connector; and the second valve body is connected to the first valve body through a pipeline.

Compared to the prior art, the present disclosure has the following beneficial effects.

In the rescue cutting-spreading plier provided herein, the cutting portion simultaneously has functions of cutting, dismantling and spreading. A front end at an inside of the cutting portion is configured to crush obstacles, like con- crete; blades of the cutting portion is configured to cut and separate steel bars from concrete, and cut steel tubes, shaped steels and I-beams; a tip provided at a front end at an outside of the cutting portion is configured to insert into a gap for expansion, so as to open up a rescue channel. The application provides a mechanics-electronics-hydrau- lics integrated control system, which can realize the quick coupling of accessories and shorten the switching process. In addition, a directional control valve is employed to control on-off and direction change of an oil passage, which greatly simplifies the operation of the hydraulic pipeline and improves the stability of the control system. The disclosure achieves the control of a cutting-spreading integrated accessory with two oil passages (respectively for oil entering and returning), overcoming the defects in the prior art that the accessories merely have a single function; the replacement process is time-consuming and inefficient; and multiple pipelines are required.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a rescue cutting-spreading plier according to an embodiment of the present disclosure. FIG. 2 is a perspective view showing the arrangement of three three-position four-way directional control valves on a first valve body according to an embodiment of the present disclosure. FIG. 3 schematically shows a structure of a holder for mounting the first valve body according to an embodiment of the present disclosure. FIG. 4 schematically illustrates a structure of a control mechanism according to an embodiment of the present dis- closure.

FIG. 5 is a perspective view of an oil circuit switching mechanism according to an embodiment of the present dis- closure.

FIG. 6 is a perspective view of an oil circuit quick-change mechanism according to an embodiment of the present dis- closure.

FIG. 7 is a partial cross-sectional view of a rotary control mechanism according to an embodiment of the present dis- closure.

FIG. 8 is a schematic diagram of a cutting-spreading mech- anism according to an embodiment of the present disclosure. FIG. 9 is a schematic diagram showing the arrangement of a limit block on an oil separator according to an embodiment of the present disclosure.

FIG. 10 is a schematic diagram of a cutting portion accord- ing to an embodiment of the present disclosure.

FIG. 11 is a schematic diagram of a jacking mechanism ac- cording to an embodiment of the present disclosure. FIG. 12 shows the pipeline connections between the oil separator, a first hydraulic cylinder and a second hydrau- lic cylinder according to an embodiment of the present disclosure.

FIG. 13 schematically depicts the hydraulic principle ac- cording to an embodiment of the present disclosure.

FIG. 14 schematically shows the oil circuit under the cut- ting-spreading action according to an embodiment of the present disclosure.

FIG. 15 schematically shows the oil circuit under the cut- ting-closing action according to an embodiment of the pre- sent disclosure.

FIG. 16 schematically shows the oil circuit under the jack- ing action of the second hydraulic cylinder according to an embodiment of the present disclosure.

FIG. 17 schematically shows the oil circuit under the re- turning action of the second hydraulic cylinder according to an embodiment of the present disclosure.

FIG. 18 schematically shows the oil circuit under the for- ward rotation of the rotary control mechanism according to an embodiment of the present disclosure. FIG. 19 schematically shows the oil circuit under the re- verse rotation of the rotary control mechanism according to an embodiment of the present disclosure. In the drawings: 1, control mechanism; 2, oil circuit switching mechanism; 3, rotary control mechanism; 4, cut- ting-spreading mechanism; 5, jacking mechanism; 6, first valve body; 7, first O-type three-position four-way direc- tional control valve; 8, second O-type three-position four- way directional control valve; 9, Y-type three-position four-way directional control valve; 10, pressure reducing valve; 11, pressure-measuring port; 12, holder; 13, con- necting base; 14, second valve body; 15, male quick plug- in connector; 16, box body; 17, hydraulic gerotor motor; 18, second control valve block; 19, fixed base; 20, slewing bearing; 21, meshing pinion; 22, gear gasket; 23, first control valve block; 24, oil separator; 24.1, core body;

24.2, main body; 25, limit block; 26, first pin shaft; 27, first hydraulic cylinder; 28, second pin shaft; 29, hous- ing; 30, third pin shaft; 31, cutting portion; 31.1, con- necting hole; 31.2, lug hole; 32, spreading jaw; 33, blade; 34, cushion; 35, second hydraulic cylinder; 36, support block; 37, locking cushion block; and 38, round nut.

DETAILED DESCRIPTION OF EMBODIMENTS The principles and features of the present disclosure will be further described in detail with reference to the ac- companying drawings. The embodiments presented in the ac- companying drawings are merely illustrative of the disclo- sure, and are not intended to limit the present disclosure. As shown in Figs. 1-12, illustrated is a rescue cutting- spreading plier, including a control mechanism 1, an oil circuit switching mechanism 2, a rotary control mechanism 3, a cutting-spreading mechanism 4 and a jacking mechanism

5.

As shown in Figs. 2 and 4, the control mechanism 1 includes a first valve body 6, a first O-type three-position four-

way directional control valve 7, a second O-type three- position four-way directional control valve 8 and a Y-type three-position four-way directional control valve 9. The first valve body A 6 is configured to divide two oil pas- sages into six oil passages, which greatly reduces the consumption of pipelines.

The first valve body 6 is pro- vided with a pressure reducing valve 10, which can effec-

tively control oil pressure of the oil passages and prevent the system from overloading to damage the motor.

In addi- tion, the first valve body 6 is also provided with a pres- sure-measuring port 11, which facilitates the real-time monitoring of the oil pressure of the oil passages to ensure the stability of the oil circuit.

Two of the six oil pas- sages pass through the first O-type three-position four-

way directional control valve 7, and the first O-type three-position four-way directional control valve 7 is con- figured to control on-off and direction change of the cut-

ting-spreading oil circuit.

The other two of the six oil passages pass through the second O-type three-position four-way directional control valve 8, and the second O-type three-position four-way directional control valve 8 is con- figured to control on-off and direction change of the jack-

ing oil circuit.

When the first O-type three-position four- way directional control valve 7 or the second O-type three- position four-way directional control valve 8 returns to a neutral position, the corresponding oil circuit will be cut off immediately, and the cutting-spreading action or the jacking action will be stopped, which improves the safety of the operation.

The last two of the six passages pass through the Y-type three-position four-way directional con- trol valve 9, and the Y-type three-position four-way di- rectional control valve 9 is configured to control the on-

off and direction change of the slewing oil circuit.

When the Y-type directional control valve 9 returns to a neutral position, the oil feed is interrupted and the oil return cavity remains unblocked.

At this time, a swing motor is in a floating state without suffering the brake load, fa- cilitating protecting the motor from damage. The first O- type three-position four-way directional control valve +, the second O-type three-position four-way directional con- trol valve 8 and the Y-type three-position four-way direc- tional control valve 9 are mounted on the first valve body

6. The first valve body 6 is fixedly provided on a box body 16 through a holderl2. As shown in Fig. 5, the oil circuit switching mechanism 2 includes a connecting base 13, a second valve body 14 and a male quick plug-in connector 15. During the operation, hydraulic oil fed by a main oil pump of an excavator drives a quick-change oil cylinder to stretch out and draw back, so as to achieve the structural locking. The oil cylinder moves horizontally to drive a locking pin to move to lock a welding pin shaft of the connecting base 13 and achieve the connection of oil circuit. At the same time, the oil cylinder also drives a valve block A to move, so that a female quick plug-in connector on the valve block A is coupled with the male quick plug-in connector 15 on a valve block B, which enables the connection of the oil circuit, completing the attachment of the accessory to the excava- tor, where the coupling process lasts for about 1-4 s. The oil circuit switching system not only has less time con- sumption and high efficiency, but also has reliable sealing and high oil circuit stability. The connecting base 13 includes a base plate and two side plates. A pairs of connecting shafts are respectively mounted on the side plates. The base plate is connected to a box body 16 of the rotary control mechanism 3. The male quick plug-in con- nector 15 is mounted on the second valve body 14. The second valve body 14 is fixedly provided on the base plate of the connecting base 13. As shown in Figs. 1 and 7, the rotary control mechanism 3 includes the box body 16, a hydraulic gerotor motor 17, a second control valve block 18, a fixed base 19, a slewing bearing 20, a meshing pinion 21 and a gear gasket 22. The slewing bearing 20 has a single-row four-point contact ball structure with inner teeth, which has a compact structure and a light weight, and can bear axial force, radial force and tilting moment at the same time.

The slewing bearing 20 is fixedly provided at a lower end of the box body 16. The second control valve block 18 includes a valve body, a double-balanced valve and a double-relief valve.

The second control valve blockl8 can ensure the smooth running of the motor.

The double-balanced valve can keep the motor in place when the oil circuit is suddenly cut off, so as to avoid personal injuries caused by inertial rotation of the rescue accessories.

The double-relief valve plays a role of overload protection, which can limit a maximum pressure of the system, thereby avoiding excessive oil pressure to damage the motor.

The second control valve block 18 is provided on the hydraulic gerotor motor 17. The hydraulic gerotor motor 17 is a low-speed and high-torque motor, which runs smoothly.

The meshing pinion 21 is provided on an output end of the hydraulic gerotor motor 17, which is matched with the slewing bearing 20 to achieve the 360°ro- tation of a hydraulic grab.

The hydraulic gerotor motor 17 is provided on the fixed base 19, and the fixed base 19 is fixedly provided on the box body 16. The meshing pinion 21 is matched with the hydraulic gerotor motor 17 through a spline connection.

This connection mode has a large contact area, large strength and high load bearing performance.

A lower end of the meshing pinion 21 is fixed on a lower end of the fixed base by means of the gear gasket 22 and a fastener.

As shown in Figs. 1 and 8, the cutting-spreading mechanism 4 includes a first control valve block23, an oil separator 24, two limit blocks 25, two first pin shafts 26, two first hydraulic cylinders 27, two second pin shafts 28, a housing 29, two third pin shafts 30, two cutting portions31, two spreading jaws 32, two blades 33 and a cushion 34. The housing 29 is configured for arrangement of a spreading portion.

The two cutting portions 31 are triangular.

The first control valve block 23 includes a valve body and two balance valves, where one of the two balance valves is configured for the oil circuit for the spreading of the cutting portion31, and the other is used for the oil circuit for jacking. The two balance valves are configured to keep the cutting portion 31 in an open state or the jacking mechanism in a jacking state when the oil circuit is in- terrupted suddenly, so as to avoid personal injury caused by falling of the cutting portion 31 or return of the jacking mechanism when the oil circuit is depressurized.

The first control valve block 23 is provided on the oil separator 24. The oil separator 24 includes a core body

24.1, a main body 24.2, an oil seal and a circlip for shaft.

As shown in Figs. 8-9, the main body 24.2 is sleeved on the core body 24.1. The main body 24.2 and the core body 24.1 are rotatable in relation to each other. The control valve block B 23 is provided on the core body 24.1 of the oil separator 24. The main body 24.2 is provided on an end inside the housing 29. The limit block 25 is fixedly pro- vided on a side wall of the main body 24.2 of the oil separator 24. The limit block 25 is fixedly connected to the housing 29. The oil separator 24 is configured to sep- arate the oil and limit the rotation of the pipelines. Four oil passages from an electromagnetic directional control valve are divided into six oil passages through the oil separator 24, where four of the six oil passages are used to act on the two first hydraulic cylinders 27 to complete the cutting-spreading action, and the remaining two oil passages are configured for a second hydraulic cylinder 35 to complete the jacking action. In addition, when the ac- cessory performs a slewing action, the limit block 25 will limit the rotation of the main body 24.2, and allow the core body 24.1 to rotate relatively. Such structure can keep the pipeline in place during the slewing process to avoid the occurrence of pipe winding, which is beneficial for the stability of the oil circuit. The two limit blocks 25 are provided on the housing 29. The oil separator 24 is fixedly provided on the box body 16. One end of each of the two first hydraulic cylinders 27 is hinged with an upper end of the housing 29 through the corresponding first pin shaft 26, and the other end of each of the two first hy- draulic cylinders 27 is hinged with a lug hole 31.2 of the corresponding cutting portion 31 through the second pin shaft 28. The two cutting portions 31 are hinged with a lower end of the housing 29 through the corresponding pin shaft 30. The two cutting portions 31 are triangular, and three corners of each of the two cutting portions 31 are provided with the lug hole 31.2, a connecting hole 31.1 and a spreading jaw mounting groove, respectively, as shown in

Fig. 10. Such triangular structure makes the cutting por- tion 31 become stable and reliable.

In addition, the two first hydraulic cylinders 27 provide strong cutting, dis- mantling and spreading forces and have high work effi- ciency.

An upper end of the cutting portion31 is designed to have a serrated structure, which is matched with a sup- port block 36 to limit the rotation of the cutting portion

31 during the spreading operation, thereby achieving sec- ondary protection.

The spreading jaw 32 is mounted on the spreading jaw mounting groove of the cutting portion 31 through a fastening bolt and a limit sleeve.

The spreading Jaw 32 can be replaced after being worn, allowing for a convenient and efficient operation.

An outer end of the spreading jaw 32 is designed as a serrated structure and a front end is designed as a sharp structure.

Such uniform transition structure of the spreading jaw 32 has high strength.

The spreading jaw 32 can be inserted into a gap of a wall and then the outside of the shearing body 31 can be used to spread the gap.

An inside of the spreading jaw

32 is designed as a groove structure, which can effectively hold and crush the objects.

The blade 33 is mounted on the cutting portion31 through the fastening bolt and the limit sleeve, which is beneficial for the replacement.

Specifi- cally, a special alloy material will make the blade 33 have high shearing strength.

The cushion 34 is fixedly provided on a side lug provided on the lower end of the housing 29. The cushion 34 is configured to limit the axial movement of the cutting portion 31, so that a reasonable gap is maintained between two blades, thereby improving the shear- ing effect and service life.

Such structure can also show a certain guiding effect.

As shown in Fig. 11, the jacking mechanism 5 includes the second hydraulic cylinder 35, the support block 36, a lock- ing cushion block 37 and a round nut 38. The support block 36 is fixedly provided on a piston rod of the second hy- draulic cylinder 35 through the locking cushion block 37 and the round nut 38. The second hydraulic cylinder 35 is fixedly provided on a lower support plate inside the hous- ing 29. During the spreading operation, the hydraulic oil is fed into a rod cavity of the two first hydraulic cylin- ders 27 to push the piston to move to drive the cutting portion 31 to open.

When the cutting portion 31 is opened to a required position, the oil circuit of the two first hydraulic cylinders 27 is interrupted to keep the cutting portion 31 in place.

At the same time, the oil circuit is switched to the oil circuit of the jacking mechanism 5 through the control system.

The hydraulic oil is fed into a rodless cavity of the second hydraulic cylinder 35 to push the piston to extend vertically.

The support block 36 is driven to move into the serrated groove at the upper end of the cutting portion 31 to clamp the cutting portion 31, thereby limiting the rotation of the cutting portion 31. Such structure can prevent the cutting portion 31 from falling back suddenly when the oil circuit of the cutting- spreading mechanism 4 suffers from a failure, thereby achieving secondary protection for the spreading operation.

As shown in Fig. 4 and Figs.11-18, a control system of the rescue cutting-spreading plier includes the first valve body A 6, a first O-type three-position four-way direc- tional control valve 7, a second O-type three-position four-way directional control valve 8 and a Y-type three- position four-way directional control valve 9, wherein the first O-type three-position four-way directional control valve 7, the second O-type three-position four-way direc- tional control valve 8 and the Y-type three-position four- way directional control valve 9 are mounted on the first valve body 6. The first valve body 6 is configured to divide two oil passages into six oil passages, and is provided with a pressure reducing valve 10. Two of the six oil passages are communicated with the two first hydraulic cyl- inders 27 through the first O-type three-position four-way directional control valve 7, the first control valve block 23 and the oil separator 24. Two of the six oil passages are communicated with the second hydraulic cylinder 35 through the second O-type neutral three-position four-way directional control valve 8, the first control valve block 23 and the oil separator 24. The remaining two of the six oil passages are communicated with the hydraulic gerotor motor 17 through the Y-type three-position four-way direc- tional control valve 9 and the second control valve block

18. The control system further includes the second valve body 14 with a male quick plug-in connector 15. The second valve body 14 is connected to the first valve body 6 through a pipeline. As shown in Figs. 13-19, the disclosure provides a control system, in which the control valve block and the three three-position four-way electromagnetic directional con- trol valves are integrated to realize the switching of the oil circuit, thereby greatly simplying the oil circuit sys- tem and reducing the use of pipelines. When the excavator is operated, the oil circuit quick coupling mechanism and the oil circuit switching mechanism quickly complete the connection of the oil circuit and mechanical connection. At the same time, the circuit of the excavator is coupled with that of the solenoid valve to achieve the successful connection between the excavator and the accessory. The hydraulic oil supplied by the main pump of the excavator is divided into six oil passages after fed into the valve body of the control system through the oil passage quick coupling mechanism. Four of the six oil passages are con- figured to drive the hydraulic cylinders of the cutting- spreading mechanism 4 and the jacking mechanism 5through the oil separator 24, so as to realize the cutting-spread- ing action and jacking action. The directional control valves configured to control the cutting-spreading action and the jacking action are O-type directional control valves. The O-type directional control valves can brake quickly when the oil inlet of the oil passage is cut off. Such control mode not only guarantees the smoothness of the cutting-spreading action and the jacking action, but also improves the safety. The remaining two of the six oil pas- sages are configured to drive the hydraulic gerotor motor 17 to achieve the 360°rotation of the cutting-spreading plier. The rotary control mechanism 3 adopts a Y-type di- rectional control valve, which can make the motor stop rotating smoothly when the oil-feeding passage is cut off, so as to avoid damage to the motor. The control system makes the rescue accessory multi-functional and greatly simplifies the pipeline without increasing the oil passage in a host machine, which makes the operation more conven- ient and efficient.

The expansion of the cutting portion 31 is performed as follows.

The hydraulic oil by the main pump is fed into the oil separator 24 through the first O-type three-position four- way directional control valve 7. The separated oil is fed into a rod cavity of an oil cylinder through the balance valve. In the process, a pilot-operated check valve is not opened. The hydraulic oil drives a piston rod to move from a high-pressure cavity to a low-pressure cavity, and the hydraulic oil in the low-pressure cavity returns to the oil cylinder to make the oil cylinder draw back, thereby open- ing the cutting portion 31. In the process, if an inter- ruption suddenly occurs to the hydraulic oil supplied by the main pump, the hydraulic oil in the rod cavity fails to return to the oil cylinder since the pilot-operated check valve is not opened and the cutting portion 31 is kept in place, avoiding falling back of the cutting portion

31. A closing process of the cutting portion 31 is performed as follows, The hydraulic oil by the main pump is fed into the oil separator 24 through the first O-type three-position four-

way directional control valve 7. The separated oil is fed into a rodless cavity of the oil cylinder.

At the same time, the pilot-operated check valve is opened to push the piston rod to move from the high-pressure cavity to the low-pressure cavity.

The hydraulic oil in the low-pressure cavity returns to the oil cylinder through the balance valve to stretch the oil cylinder out, thereby closing the cutting portion 31. A jacking process of a second hydraulic cylinder 35 is performed as follows.

The hydraulic oil by the main pump is fed into the oil separator 24 through the second O-type neutral three-posi- tion four-way directional control valve B 8. The separated oil is fed into the rod cavity of the oil cylinder.

In the process, the pilot-operated check valve is not opened.

The hydraulic oil drives the piston rod to move from the high- pressure cavity to the low-pressure cavity, and the hydrau- lic oil in the low-pressure cavity returns to the oil cyl- inder to stretch the piston rod out, so the support block 36 is pressed against the cutting portion 31. In the pro- cess, if an interruption suddenly occurs to the hydraulic oil supplied by the main pump, the hydraulic oil in the rodless cavity fails to return to the oil cylinder through the balance valve since the pilot-operated check valve is not opened and the support block 36 is kept in place, avoiding falling back of the second hydraulic cylinder 35. A returning process of the second hydraulic cylinder 35 is performed as follows.

The hydraulic oil by the main pump is fed into the oil separator 24 through the second O-type neutral three-posi- tion four-way directional control valve 8. The separated oil is fed into the rod cavity of the oil cylinder.

The hydraulic oil in the low-pressure cavity returns to the oil cylinder through the balance valve to make the oil cylinder and the piston rod draw back, and detach the support block 36 from the cutting portion 31. A process of forward rotation of a rotary control mechanism 3 is performed as follows.

The hydraulic oil by the main pump is fed into the control valve block through the Y-type three-position four-way di- rectional control valve 9. At this time, if the oil pressure supplied by the main pump is greater than the stated opening pressure of an overflow valve, the overflow valve is opened to remove the overload, which ensures that the oil pressure of the system never exceeds the maximum stated pressure and the hydraulic oil that meets the pressure requirements is fed into the motor through the balance valve. At the same time, the pilot-operated check valve is opened to drive the motor to rotate. The low-pressure oil inside the motor returns to the oil tank through a loop balance valve to complete the forward rotation. In the process, if an in- terruption suddenly occurs to the hydraulic oil supplied by the main pump, the circuit is interrupted and the hy- draulic motor will stop rotating slowly since the pilot- operated check valve is not opened, and the cutting portion 31 maintains its original angle. A process of backward rotation of the rotary control mechanism 3 is performed as follows.

The hydraulic oil by the main pump is fed into the control valve block through the Y-type neutral three-position four- way directional control valve 9. At this time, if the oil pressure supplied by the main pump is greater than the stated opening pressure of the overflow valve, the overflow valve is opened to remove the overload, which ensure that the oil pressure of the system never exceeds the maximum stated pressure and the hydraulic oil that meets the pres- sure requirements is fed into the motor through the balance valve. At the same time, the pilot-operated check valve is opened to drive the motor to rotate. The low-pressure oil inside the motor returns to the oil tank through the loop balance valve to complete the backward rotation. In the process, if an interruption suddenly occurs to the hydrau- lic oil supplied by the main pump, the circuit is inter- rupted and the hydraulic motor will stop rotating slowly since the pilot-operated check valve is not opened, and the cutting portion 31 maintains its original angle.

When the pilot valve is not turned on, the passage is interrupted and the hydraulic motor will stop rotating slowly.

There- fore, the cutting portion 31 maintains its original angle the hydraulic oil supplied by the main pump is suddenly interrupted during this process.

Described above are only preferred embodiments of this ap- plication, and are not intended to limit this application.

Any modification, equivalent replacement and improvement made without departing from the spirit of this application shall fall within the scope of this application.

Claims

CONCLUSIESCONCLUSIONS

1. Snijdende-uitspreidende tang, omvattend: een stuurmechanisme (1); een schakelmechanisme (2) voor een oliecircuit; een roterend stuurmechanisme (3); een snijdend-uitspreidend mechanisme (4); en een vijzelmechanisme (5); met het kenmerk, dat het snijdende-uitspreidende me- chanisme (4) een eerste blok (23) voor een stuurklep, een oliescheidinginrichting (24), twee eerste penassen (26), twee eerste hydraulische cilinders (27); twee tweede penas- sen (28), een behuizing (29), twee derde penassen (30), twee snijgedeelten (31), twee uitspreidende kaken (32) en twee bladen (33) omvat; waarbij de behuizing (29) is geconfigu- reerd voor het aanbrengen van een uitspreidend gedeelte; waarbij de oliescheidinginrichting (24) een kernlichaam (24.1) en hoofdlichaam (24.2) omvat; waarbij het hoofd- lichaam (24.2) is voorzien van een huls op het kernlichaam (24.1); waarbij het hoofdlichaam (24.2) en het kernlichaam (24,1) roteerbaar zijn ten opzichte van elkaar; waarbij het eerste blok (23) van de stuurklep is verschaft op het kern- lichaam (24.1) van de oliescheidinginrichting (24); waarbij het hoofdlichaam (24.2) is verschaft op een eind binnen de behuizing (29); waarbij de twee eerste hydraulische cilin- ders (27) symmetrisch zijn aangebracht op beide zijden van de behuizing (29); waarbij het ene eind van elke van de twee eerste hydraulische cilinders (27) scharniert met een bo- veneind van de behuizing (29) door de eerste penas (26), en het andere eind van elke van de twee eerste hydraulische cilinders scharniert met een gat (31.2) voor een drukmiddel van de overeenkomende snijgedeelten (31) door de overeenko- mende tweede penas (28); waarbij de twee snijgedeelten (31) driehoekvormig zijn en drie hoeken van elk van de twee snij- gedeelten (31) zijn verschaft met respectievelijk het gat (31.2) voor het drukmiddel, een verbindend gat (31.1) en een aanbrenggroef voor de uitspreidende kaak; waarbij de hoek van elk van de twee snijgedeelten (31), die is verschaft met het verbindende gat (31.1), scharniert met een ander eind van de behuizing (29) door de overeenkomende derde penas (30); waarbij de hoek van elk van de twee snijgedeelten (31), die is verschaft met het verbindende gat (31.1), een afgeronde hoek is en de afgeronde hoek is verschaft met een zaagtandvormige structuur; waarbij elke van de twee uit- spreidende kaken (32) op de aanbrenggroef voor de uitsprei- dende kaak van het overeenkomende snijgedeelte (31) is ver- schaft door middel van een vastzetpen en een begrenzende huls; waarbij elk van de twee bladen (33) is verschaft op een eindoppervlak van de langste zijde van het overeenko- mende driehoekvormige snijgedeelte (31) door middel van de vastzetpen en de begrenzende huls; en de twee eerste hy- draulische cilinders (27) zijn verbonden met de olieschei- dinginrichting (24) door middel van oliedoorgangen.A cutting-spreading forceps, comprising: a steering mechanism (1); a switching mechanism (2) for an oil circuit; a rotary steering mechanism (3); a cutting-spreading mechanism (4); and a jack mechanism (5); characterized in that the cutting-spreading mechanism (4) comprises a first control valve block (23), an oil separator (24), two first pin shafts (26), two first hydraulic cylinders (27); includes two second pin shafts (28), a housing (29), two third pin shafts (30), two cutting portions (31), two spreading jaws (32), and two blades (33); wherein the housing (29) is configured to provide a spreading portion; wherein the oil separation device (24) comprises a core body (24.1) and main body (24.2); the main body (24.2) including a sleeve on the core body (24.1); wherein the main body (24.2) and the core body (24,1) are rotatable with respect to each other; wherein the first block (23) of the control valve is provided on the core body (24.1) of the oil separation device (24); the main body (24.2) being provided at one end within the housing (29); wherein the two first hydraulic cylinders (27) are arranged symmetrically on both sides of the housing (29); wherein one end of each of the two first hydraulic cylinders (27) is pivoted with an upper end of the housing (29) through the first pin shaft (26), and the other end of each of the two first hydraulic cylinders is pivoted with a hole (31.2) for a pressure means of the corresponding cutting portions (31) through the corresponding second pin shaft (28); wherein the two cutting portions (31) are triangular in shape and three corners of each of the two cutting portions (31) are provided with the pressure means hole (31.2), a connecting hole (31.1) and a spreading jaw mounting groove, respectively; wherein the corner of each of the two cutting portions (31) provided with the connecting hole (31.1) is hinged to another end of the housing (29) by the corresponding third pin axis (30); wherein the corner of each of the two cutting portions (31) provided with the connecting hole (31.1) is a rounded corner and the rounded corner is provided with a sawtooth-shaped structure; wherein each of the two spreading jaws (32) is provided on the spreading jaw mounting groove of the corresponding cutting portion (31) by means of a locking pin and a limiting sleeve; wherein each of the two blades (33) is provided on an end surface of the longest side of the corresponding triangular cutting portion (31) by means of the locking pin and the limiting sleeve; and the two first hydraulic cylinders (27) are connected to the oil separation device (24) by oil passages.

2. Snijdende-uitspreidende tang voor reddingswerk- zaamheden volgens conclusie 1, met het kenmerk, dat het roterende stuurmechanisme (3) een kastlichaam (16), een hy- draulische gerotormotor (17), een tweede blok (18) voor een stuurklep en een zwenksteunmiddel (20) omvat; waarbij de hydraulische gerotormotor en het tweede blok voor de stuur- klep zijn verschaft binnen het kastlichaam (16), waarbij het zwenksteunmiddel {20) is verschaft op een buitenzijde van het kastlichaam (16); waarbij het tweede blok (18) voor de stuurklep is verschaft op de hydraulische gerotormotor (17); waarbij een uitgaand eind van de hydraulische gerotormotor (17) is verschaft met een ingrijprondsel (21); waarbij het ingrijprondsel (21) is verschaft op de buitenzijde van het kastlichaam (16); waarbij het ingrijprondsel (21) in een roterend ringdrijfwerk grijpt van het zwenksteunmiddel {20}; waarbij de behuizing (29) vaststaand is verbonden met het roterende ringdrijfwerk van het zwenksteunmiddel (20); waar- bij het kernlichaam (24.1) is bevestigd op het kastlichaam (16); waarbij een boveneind van het kernlichaam (24.1) ligt in het kastlichaam (16), en een ondereind van het kernli- chaam (24.1) ligt in de behuizing (29); en het kernlichaam (24,1) is verschaft bij een midden van het zwenksteunmiddel (20).The cutting-spreading pliers for rescue work according to claim 1, characterized in that the rotary control mechanism (3) comprises a box body (16), a hydraulic gerotor motor (17), a second block (18) for a control valve and includes a pivot support means (20); the hydraulic gerotor motor and the second control valve block are provided inside the box body (16), the pivot support means {20) being provided on an outside of the box body (16); the second control valve block (18) being provided on the gerotor hydraulic motor (17); wherein an output end of the hydraulic gerotor motor (17) is provided with an engagement pinion (21); the engagement pinion (21) being provided on the outside of the box body (16); the meshing pinion (21) meshing with a rotary ring gear of the pivot support means {20}; the housing (29) being fixedly connected to the rotary ring gear of the pivot support means (20); wherein the core body (24.1) is mounted on the box body (16); wherein an upper end of the core body (24.1) lies in the housing body (16), and a lower end of the core body (24.1) lies in the housing (29); and the core body (24,1) is provided at a center of the pivot support means (20).

3. Snijdende-uitspreidende tang voor reddingswerk- zaamheden volgens conclusie 2, met het kenmerk, dat een vijzelmechanisme (5) een tweede hydraulische cilinder (35) omvat; waarbij een steunblok (36) vaststaand is verschaft op een zuigerstang van de tweede hydraulische cilinder (35); waarbij de tweede hydraulische cilinder (35) vaststaand is verschaft binnen de behuizing (29); waarbij de tweede hy- draulische cilinder (35) en een oliescheidinginrichting (24) zijn verschaft aan beide einden van een vaststaande basis (19); waarbij de tweede hydraulische cilinder (35) is ver- bonden met de oliescheidinginrichting (24) door oliedoor- gangen; en het steunblok (36) is geconfigureerd teneinde vaststaand een snijgedeelte (31) vast te klemmen.Cutting-spreading pliers for rescue operations according to claim 2, characterized in that a jack mechanism (5) comprises a second hydraulic cylinder (35); wherein a support block (36) is fixedly provided on a piston rod of the second hydraulic cylinder (35); the second hydraulic cylinder (35) being fixedly provided within the housing (29); wherein the second hydraulic cylinder (35) and an oil separator (24) are provided at both ends of a fixed base (19); wherein the second hydraulic cylinder (35) is connected to the oil separation device (24) by oil passages; and the support block (36) is configured to fixedly clamp a cutting portion (31).

4. Snijdende-uitspreidende tang voor reddingswerk- zaamheden volgens conclusie 3, met het kenmerk, dat een boveneind van de behuizing (29) is verschaft met twee groe- pen buitengelegen scharnierende drukmiddelen, en elke van de twee groepen buitengelegen scharnierende drukmiddelen bestaat uit twee scharnierende drukmiddelen; waarbij elke groep van de buitengelegen drukmiddelen scharniert met een overeenkomende eerste hydraulische cilinder (27); waarbij een ondereind van de behuizing (29) is verschaft met twee antislijtageplaten; en een eind van elk van de twee snijge- deelten (31), dat is verschaft met een verbindend gat (31.1), is ingebracht tussen de twee antislijtageplaten en scharniert met de twee antislijtageplaten.The cutting-distributing pliers for rescue operations according to claim 3, characterized in that an upper end of the housing (29) is provided with two groups of outer hinged pressure means, and each of the two groups of outer hinged pressure means consists of two hinged pressure means; wherein each group of the outer pressure means pivots with a corresponding first hydraulic cylinder (27); wherein a lower end of the housing (29) is provided with two anti-wear plates; and one end of each of the two cutting portions (31), which is provided with a connecting hole (31.1), is inserted between the two anti-wear plates and pivots with the two anti-wear plates.

5. Snijdende-uitspreidende tang voor reddingswerk- zaamheden volgens conclusie 1, met het kenmerk, dat het stuurmechanisme (1) een eerste kleplichaam (6) en een eerste vierwegrichting stuurklep (7) met drie posities van het O- type, een tweede vierwegrichting stuurklep (8) met drie po- sities van het O-type en een vierwegrichting stuurklep (9) met drie posities van het Y-type omvat, waarbij de eerste vierwegrichting stuurklep (7) met de drie posities van het O-type, de tweede vierwegrichting stuurklep (8) met de drie posities van het O-type en de vierwegrichting stuurklep (9) met de drie posities van het Y-type zijn aangebracht op het eerste kleplichaam (6), waarbij het eerste kleplichaam (6) is geconfigureerd teneinde twee oliedoorgangen te verdelen in zes oliedoorgangen en is verschaft met een drukreduceer- klep (10); waarbij twee van de zes oliedoorgangen zijn ver- bonden met de twee eerste hydraulische cilinders (27) door de eerste omkerende vierwegrichting stuurklep (7) met de drie posities van het O-type, het eerste blok {23) van de stuurklep en de oliescheidinginrichting (24); waarbij de twee van de zes oliedoorgangen in verbinding staan met een tweede hydraulische cilinder (35) door de tweede vier- wegrichting stuurklep (8) met de drie posities van het O- type, het eerste blok (23) van de stuurklep en de olieschei- dinginrichting (24); en de laatste twee van de zes olie- doorgangen in verbinding staan met een hydraulische gero- tormotor (17) door de vierwegrichting stuurklep (9) met de drie posities van het Y-type en een tweede blok (18) van de stuurklep.The cutting-spreading forceps for rescue work according to claim 1, characterized in that the control mechanism (1) comprises a first valve body (6) and a first four-way control valve (7) having three positions of O-type, a second four-way direction O-type three-position pilot valve (8) and comprising a Y-type four-way three-position pilot valve (9) wherein the first O-type four-way pilot valve (7) having the three positions, the second four-way control valve (8) with the three positions of the O type and the four-way direction control valve (9) with the three positions of the Y type are mounted on the first valve body (6), wherein the first valve body (6) is configured to divide two oil passages into six oil passages and is provided with a pressure reducing valve (10); wherein two of the six oil passages are connected to the two first hydraulic cylinders (27) by the first reversing four-way control valve (7) having the three positions of the O-type, the first block {23) of the control valve and the oil separation device (24); the two of the six oil passages communicating with a second hydraulic cylinder (35) through the second four-way control valve (8) having the three positions of the O-type, the first block (23) of the control valve and the oil separator - ding device (24); and the last two of the six oil passages communicate with a hydraulic gerotor motor (17) through the four-way pilot valve (9) having the three positions of Y-type and a second block (18) of the pilot valve.

6. Snijdende-uitspreidende tang voor reddingswerk- zaamheden volgens conclusie 5, met het kenmerk, dat het eerste kleplichaam (6) vaststaand is verschaft op een kast- lichaam (16) door middel van een vasthoudmiddel (12).Cutting-spreading forceps for rescue operations according to claim 5, characterized in that the first valve body (6) is fixedly provided on a box body (16) by means of a retaining means (12).

7. Snijdende-uitspreidende tang voor reddingswerk- zaamheden volgens conclusie 1, met het kenmerk, dat het schakelmechanisme (2) voor het oliecircuit een verbindende basis (13,) een tweede kleplichaam (14) en een snel koppe- lend instekend verbindingmiddel (15) omvat; waarbij een on- dereind van de verbindende basis (13) is verbonden met een lichaam (16) van de kast van het roterende stuurmechanisme (3); waarbij het snel koppelende instekende verbindingmiddel {15) is aangebracht op het tweede kleplichaam (14); waarbij tweede kleplichaam (14) vaststaand is verschaft op de ver- bindende basis (13); en het tweede kleplichaam (14) is ver- bonden met het eerste kleplichaam (6) door middel van een leiding.The cutting-spreading pliers for rescue work according to claim 1, characterized in that the oil circuit switching mechanism (2) has a connecting base (13), a second valve body (14) and a quick coupling male connector (15). ) includes; wherein a lower end of the connecting base (13) is connected to a body (16) of the case of the rotary steering mechanism (3); wherein the quick coupling male connector {15) is mounted on the second valve body (14); wherein second valve body (14) is fixedly provided on the connecting base (13); and the second valve body (14) is connected to the first valve body (6) by a conduit.

8. snijdende-uitspreidende tang voor reddingswerk- zaamheden volgens conclusie 1, met het kenmerk, dat een beperkend blok (25) vaststaand is verschaft op een zijwand van het hoofdlichaam (24.2) van de oliescheidinginrichting (24); en het beperkende blok (25) vaststaand is verbonden met de behuizing (29).The cutting-spreading forceps for rescue operations according to claim 1, characterized in that a limiting block (25) is fixedly provided on a side wall of the main body (24.2) of the oil separation device (24); and the restricting block (25) is fixedly connected to the housing (29).

9. Stuursamenstel voor de bovengaande snijdende-uit- spreidende tang voor reddingswerkzaamheden, omvattend een eerste kleplichaam (6), een eerste vierwegrichting stuurklep (7) met drie posities van het O-type, een tweede vier- wegrichting stuurklep (8) met drie posities van het O-type, en een vierwegrichting stuurklep (9) met drie posities van het Y-type; met het kenmerk, dat de eerste vierwegrichting stuur- klep (7) met de drie posities van het O-type, de tweede vierwegrichting stuurklep (8) met de drie posities van het O-type en de vierwegrichting stuurklep (9) met de drie po- sities van het Y-type zijn aangebracht op het eerste klep- lichaam (6); waarbij het eerste kleplichaam (6) is geconfi- gureerd teneinde twee oliedoorgangen te verdelen in zes oliedoorgangen en is verschaft met een drukreduceerklep (10); waarbij twee van de zes oliedoorgangen in verbinding staan met twee eerste hydraulische cilinders (27) door de eerste vierwegrichting stuurklep (7) met de drie posities van het O-type, een eerste blok {23} van de stuurklep en een oliescheidinginrichting; waarbij twee van de zes oliedoorgangen in verbinding staan met een tweede hydrauli- sche cilinder (35) door de tweede vierwegrichting stuurklep (8) met de drie posities van het O-type, het eerste blok (23) van de stuurklep en de oliescheidinginrichting (24); en de overige twee van de zes oliedoorgangen in verbinding staan met een hydraulische gerotormotor (17) door de vier- wegrichting stuurklep (9) met de drie posities van het Y- type en een tweede blok (18) van de stuurklep.A pilot assembly for the above cutting-spreading forceps for rescue operations, comprising a first valve body (6), a first four-way O-type three-position pilot valve (7), a second four-way three-way pilot valve (8) O-type positions, and a four-way directional control valve (9) having three Y-type positions; characterized in that the first four-way pilot valve (7) with the three positions of the O-type, the second four-way pilot valve (8) with the three positions of the O-type, and the four-way pilot valve (9) with the three positions Y-type positions are provided on the first valve body (6); wherein the first valve body (6) is configured to divide two oil passages into six oil passages and is provided with a pressure reducing valve (10); wherein two of the six oil passages are in communication with two first hydraulic cylinders (27) through the first four-way direction control valve (7) having the three positions of the O type, a first block {23} of the control valve and an oil separator; wherein two of the six oil passages are in communication with a second hydraulic cylinder (35) through the second four-way direction control valve (8) having the three positions of the O-type, the first block (23) of the control valve and the oil separation device ( 24); and the remaining two of the six oil passages are in communication with a hydraulic gerotor motor (17) through the four-way direction control valve (9) having the three positions of the Y-type and a second block (18) of the control valve.

10. Stuursamenstel volgens conclusie 9, met het ken- merk, dat stuursamenstel verder een tweede kleplichaam (14) omvat met een instekend snel koppelend verbindingmiddel (15); en het tweede kleplichaam (14) is verbonden met het eerste kleplichaam (6) door een leiding. -0-0-0-The steering assembly of claim 9, characterized in that steering assembly further comprises a second valve body (14) having a male quick coupling connector (15); and the second valve body (14) is connected to the first valve body (6) by a conduit. -0-0-0-0-