CN201241614Y

CN201241614Y - Cylinder scraping-proof structure of hydraulic rock drill

Info

Publication number: CN201241614Y
Application number: CNU2008203019442U
Authority: CN
Inventors: 郭滇生; 徐祖全; 李春礼; 秦贻庆; 陈秀深; 杜收年; 徐抗存
Original assignee: Guilin Perforating Co
Current assignee: Guilin Perforating Co
Priority date: 2008-08-27
Filing date: 2008-08-27
Publication date: 2009-05-20
Anticipated expiration: 2018-08-27

Abstract

The utility model discloses a scuffing preventing structure of a hydraulic rock drill. A plurality of annular pressure-sharing grooves are arranged on inner walls of front and rear cylinder sleeves which match with the a piston, and simultaneously, all the sections of the piston matching with the front and rear cylinder sleeves are manufactured into a sequentially tapered structure of different length and different diameter difference according to the principle that flowing direction of liquid accords with the pressure direction, and then the piston is kept in a suspension-like state in the cylinder sleeves, thereby greatly reducing possibility that the piston directly contacts with the cylinder sleeves, and further avoiding scuffing.

Description

Hydraulic gate is prevented the scuffing of cylinder bore structure

(1) technical field:

The utility model relates to the hydraulic gate internal construction, and particularly a kind of hydraulic gate is prevented the scuffing of cylinder bore structure.

(2) background technology:

Hydraulic gate (YYG series) can be used for every field such as mine excavation, tunnel piercing and construction work, also can be used as blast furnace stokehold tapping outlet equipment

The basic functional principle of hammer drill:

Mainly by impacting and the revolution two large divisions forms, the ante-chamber of beater mechanism is pressed oil to hydraulic gate (YYG series) usually, by the commutation of one pair of sleeve valve control the advancing of back cavity, oil return realizes the reciprocal ballistic motion of piston in cylinder sleeve; Rotating mechanism is then realized the gyration of bit shank by a high pulling torque slow-speed of revolution cycloid hydraulic motor.

The error of component machining accuracy and assembly precision can't be avoided, also always there is deflection in impact axis between piston and the bit shank, outer surface of piston takes place directly to contact with inner surface of cylinder liner easily, under the effect of hydraulic coupling, destroy surface texture each other, form the interlock material, make piston can't be in cylinder sleeve operate as normal, this phenomenon i.e. " pull-cylinder phenomena ".

(3) utility model content:

The utility model purpose purpose has provided the anti-scuffing of cylinder bore structure of a kind of hydraulic gate that outer surface of piston and inner surface of cylinder liner are not directly contacted as far as possible.

Can realize the anti-scuffing of cylinder bore structure of hydraulic gate of above-mentioned purpose, be to set out many annular balancing slits on the forward and backward cylinder sleeve bore wall that cooperates with piston.Show according to the hydraulic fluid test, opening 1 annular balancing slit on cylinder sleeve can make hydraulic card clamping force reduce 30%, open 3 annular balancing slits and can reduce hydraulic card clamping force about 60%, principle is that the hydraulic oil in the annular balancing slit has a holder uniformly to hold up power to piston in a circumferential direction, avoid piston to contact, reduce hydraulic card clamping force with the direct of cylinder sleeve.

Rule of thumb, described annular balancing slit cross section is adopted usually and is the cone-shaped that opening is big, the bottom is little, and its monolateral cell wall cone angle is 30 ° ± 3 °.

In the utility model, described annular balancing slit opening is wide to be 1.5 ± 0.2mm, and the annular balancing slit degree of depth is 1.2 ± 0.2mm, and annular balancing slit bottom fillet is R0.5, and its cell wall and cylinder bore wall are with the R1.0 arc transition.

The piston Duan Weishun wimble structure that between cylinder sleeve ante-chamber and commutation signal hole, moves, promptly the piston diameter of commutation signal hole one side is big, and the piston diameter of ante-chamber one side is little; The piston section of moving between cylinder sleeve back cavity and oil return telltale hole also is suitable wimble structure, and promptly the piston diameter of oil return telltale hole one side is big, and the piston diameter of back cavity one side is little.

Can know at the above-mentioned hydraulic card clamping force of analysis, not only annular balancing slit can reduce hydraulic card clamping force, and with piston make along flow of pressurized to suitable wimble structure, not only can not tighten piston because of radial load, can produce a centering force that helps piston motion on the contrary, make piston have the automatic aligning function, reach anti-scuffing of cylinder bore effect.

The impact principle of the utility model hydraulic gate (YYG series) is to adopt ante-chamber normal pressure oil, back cavity intermittently advances or the operating principle of oil return, the piston Duan Weishun wimble structure that between ante-chamber and commutation signal hole, moves, because ante-chamber is pressed oil usually, so between ante-chamber and commutation signal hole, under any circumstance liquid stream flow direction all is consistent, so can adopt along awl, the piston diameter that is commutation signal hole one side is big, and the piston diameter of ante-chamber one side is little.

The piston section of moving between back cavity and oil return telltale hole also is suitable wimble structure, and promptly the piston diameter of oil return telltale hole one side is big, and the piston diameter of back cavity one side is little.

Two kinds of situations are arranged between back cavity and oil return telltale hole, when back cavity leads to pressure oil, can make piston to bore clearance reduce and form along awl to liquid flow direction, when leading to oil return, piston moves under the effect of ante-chamber normal pressure oil backward, make back cylinder sleeve back cavity to the oil return pipe oil extraction, the resistance that returns oil exit pipe makes a little higher than oil return pressure of cavity pressure behind the cylinder sleeve of back, so liquid stream flow direction is consistent with the logical pressure oil direction of back cylinder sleeve back cavity, equally be along awl, promptly the piston section of moving between back cavity and oil return telltale hole also is suitable wimble structure: the piston diameter of oil return telltale hole one side is big, and the piston diameter of back cavity end is little.

Described outside diameter and end diameter difference along awl section piston is 0.005mm～0.01mm; Piston between ante-chamber and the commutation signal hole is 46 ± 1mm along the awl segment length, and the piston between back cavity and the oil return telltale hole is 49 ± 1mm along the awl segment length.

On the cylinder sleeve bore wall, its position was that front and back cylinder sleeve bore and piston exist roughly evenly distributing of matching relationship section on axis direction before and after described balancing slit was opened in.

Advantage of the present utility model:

The anti-scuffing of cylinder bore structure of the utility model hydraulic gate is offered many annular balancing slits on inboard wall of cylinder liner, also plunger designs is become and flow to relevant pyramidal structure, make piston in cylinder sleeve, be in a kind of similar suspended state all the time, significantly reduce piston and the possibility that cylinder sleeve directly contacts, avoid the generation of pull-cylinder phenomena.

(4) description of drawings:

Fig. 1 is the structural representation of annular balancing slit in a kind of embodiment of the utility model.

Fig. 2 is an A place enlarged drawing in Fig. 1 embodiment.

Fig. 3 is the structural representation of the suitable awl of piston in a kind of embodiment of the utility model.

Figure number sign: 1, front jar sheath; 2, back cylinder sleeve; 3, piston; 4, annular balancing slit; 5, ante-chamber; 6, oil return telltale hole; 7, back cavity; 8, normal pressure oilhole; 9, advance or spill port; 10, commutation signal hole.

(5) specific embodiment:

In a kind of embodiment of the utility model as shown in Figure 3, comprise the piston 3 and the cylinder sleeve that cooperatively interact, cylinder sleeve is made of forward and backward cylinder sleeve 1,2 coaxial packages, the three has constituted two cavitys and has been respectively ante-chamber 5 and back cavity 7 in the rear and front end, offer commutation signal hole 10 and oil return telltale hole 6 on the front jar sheath 1 between ante-chamber 5 and the back cavity 7, offer normal pressure oilhole 8 on the front jar sheath 1 at ante-chamber 5 places, offer into or spill port 9 on the back cylinder sleeve 2 at back cavity 7 places.

On forward and backward cylinder sleeve 1,2 inwalls that cooperate with piston 3, offer many annular balancing slits 4, the cross sectional shape of annular balancing slit 4 is the cone-shaped that opening is big, the bottom is little, its monolateral cone angle is 30 ° ± 3 °, wide 1.5 ± the 0.2mm of its opening, its degree of depth is 1.2 ± 0.2mm, its bottom fillet is R0.5, and its cell wall and cylinder bore wall are with the R1.0 arc transition, as shown in Figure 1.

Piston in the utility model has suitable wimble structure, as shown in Figure 2, the piston of motion between ante-chamber 5 and commutation signal hole 10 is along wimble structure for 3 sections, piston 3 diameters that are commutation signal hole 10 1 sides are big, piston 3 diameters of ante-chamber 5 one sides are little, should be 46 ± 1mm along the length of 3 sections of poppet pistons, this be 0.005mm～0.01mm along the outside diameter of 3 sections of poppet pistons and the difference of end diameter; The piston of motion between back cavity 7 and oil return telltale hole 6 also is along wimble structure for 3 sections, piston 3 diameters that are oil return telltale hole 6 one sides are big, piston 3 diameters of back cavity 7 one sides are little, should be 49 ± 1mm along the length of 3 sections of poppet pistons, this be 0.005mm～0.01mm along the outside diameter of 3 sections of poppet pistons and the difference of end diameter.

Totally 11 of described annular balancing slits 4 are roughly on front jar sheath 1, back cylinder sleeve 2 to exist on the inner hole wall of matching relationship with piston 3 and evenly distribute by axis direction.

Claims

[claim 1] hydraulic gate is prevented the scuffing of cylinder bore structure, comprise the forward and backward cylinder sleeve (1,2) of hammer drill beater mechanism and be engaged in the interior piston (3) of forward and backward cylinder sleeve (1,2), it is characterized in that: on the inwall of the forward and backward cylinder sleeve (1,2) that cooperates with piston (3), offer many annular balancing slits (4).
[claim 2] hydraulic gate according to claim 1 is prevented the scuffing of cylinder bore structure, it is characterized in that: described annular balancing slit (4) is the cone-shaped that opening is big, the bottom is little, and its monolateral cell wall cone angle is 30 ° ± 3 °.
[claim 3] hydraulic gate according to claim 2 is prevented the scuffing of cylinder bore structure, it is characterized in that: the wide 1.5 ± 0.2mm of annular balancing slit (4) opening, annular balancing slit (4) degree of depth is 1.2 ± 0.2mm, annular balancing slit (4) bottom fillet is R0.5, and annular balancing slit (4) cell wall and cylinder bore wall are with the R1.0 arc transition.
[claim 4] is according to the anti-scuffing of cylinder bore structure of any described hydraulic gate in the claim 1～3, it is characterized in that: piston (3) the Duan Weishun wimble structure of motion between ante-chamber (5) and commutation signal hole (10), piston (3) diameter that is commutation signal hole (10) one sides is big, and piston (3) diameter of ante-chamber (5) one sides is little; The piston (3) of motion section also is that promptly piston (3) diameter of oil return telltale hole (6) one sides is big along wimble structure between back cavity (7) and oil return telltale hole (6), and piston (3) diameter of back cavity (7) one sides is little.
[claim 5] hydraulic gate according to claim 4 is prevented the scuffing of cylinder bore structure, it is characterized in that: described outside diameter and end diameter difference along awl section piston (3) is 0.005mm～0.01mm; Piston (3) between ante-chamber (5) and commutation signal hole (10) is 46 ± 1mm along the awl segment length, and the piston (3) between back cavity (7) and the oil return telltale hole (6) is 49 ± 1mm along the awl segment length.
[claim 6] is according to the anti-scuffing of cylinder bore structure of any described hydraulic gate in the claim 1～3, it is characterized in that: totally 11 of annular balancing slits (4), for going up at front jar sheath (1), back cylinder sleeve (2) and piston (3) exists on the inner hole wall of matching relationship and evenly distributes by axis direction.