CN106944959B - Automatic oil return type hydraulic pipe tongs - Google Patents
Automatic oil return type hydraulic pipe tongs Download PDFInfo
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- CN106944959B CN106944959B CN201710141360.7A CN201710141360A CN106944959B CN 106944959 B CN106944959 B CN 106944959B CN 201710141360 A CN201710141360 A CN 201710141360A CN 106944959 B CN106944959 B CN 106944959B
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- valve core
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- 238000007789 sealing Methods 0.000 claims abstract description 12
- 239000003921 oil Substances 0.000 claims description 235
- 239000007788 liquid Substances 0.000 claims description 47
- 230000005540 biological transmission Effects 0.000 claims description 25
- 238000009434 installation Methods 0.000 claims description 14
- 230000001105 regulatory effect Effects 0.000 claims description 12
- 230000033001 locomotion Effects 0.000 claims description 8
- 239000010727 cylinder oil Substances 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 238000003825 pressing Methods 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000010720 hydraulic oil Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000002788 crimping Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B13/00—Spanners; Wrenches
- B25B13/48—Spanners; Wrenches for special purposes
- B25B13/50—Spanners; Wrenches for special purposes for operating on work of special profile, e.g. pipes
- B25B13/5008—Spanners; Wrenches for special purposes for operating on work of special profile, e.g. pipes for operating on pipes or cylindrical objects
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
- Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
Abstract
The invention belongs to the technical field of hydraulic tools, and particularly relates to an automatic oil return type hydraulic pipe pressing clamp. The hydraulic pump comprises a shell, wherein a pump body assembly is arranged in the shell, an oil cylinder assembly is arranged at the front end of the pump body assembly, a clamp head assembly is arranged at the end part of the oil cylinder assembly, and a clamping head is arranged on the clamp head assembly; the pump body assembly comprises a rotating device, and a motor of the rotating device is connected with a power supply and a control system; an oil inlet cavity is radially formed in the rear end portion of the oil cylinder, an automatic oil return valve core, an automatic oil return spring and an automatic oil return plug are movably arranged in the oil inlet cavity, and the automatic oil return plug is provided with an oil outlet communicated with the oil bag; the outer end part of the automatic oil return valve core is provided with a sealing head, and when the oil inlet cavity is used for oil inlet, the sealing head can seal the oil outlet through the automatic oil return spring. When the motor stops rotating, the automatic oil return valve core is reset to automatically open the oil outlet, and the piston can be quickly reset under the action of the piston reset spring, so that the reset time is saved, and the working efficiency is greatly improved.
Description
Technical Field
The invention belongs to the technical field of hydraulic tools, and particularly relates to an automatic oil return type hydraulic pipe pressing clamp.
Background
When the pipeline is connected, the hydraulic pipe tongs are adopted, and the hydraulic pipe tongs are characterized by large pressing force, labor saving, simple operation and convenient carrying. The hydraulic pipe tongs generally comprise a manual type pipe tongs and an electric type pipe tongs, and the manual type pipe tongs are time-consuming and labor-consuming, have lower working efficiency and are not beneficial to mass operation. The electric hydraulic pipe tongs are convenient for mass operation and simple to operate, so that the electric hydraulic pipe tongs are widely applied to the field of pipeline connection.
Chinese patent No. 2008100637315 discloses an electrohydraulic clamping device: the electrohydraulic clamping device comprises an electrohydraulic push rod device and a clamp head arranged at the end part of the electrohydraulic push rod device, and is characterized in that the electrohydraulic push rod device comprises a motor driving assembly, a pump assembly driven by the motor driving assembly, a push rod assembly driven by the pump assembly, a hydraulic overflow device and a shell part for partly wrapping the electrohydraulic push rod device; the motor driving assembly comprises a motor with a speed reducer at one end, an eccentric wheel is fixed on a convex rotating shaft of the speed reducer, and a bearing is fixed on the eccentric wheel and is contacted with an oil pump plunger in the pump assembly.
The structural design of the invention has the following defects:
1. after the operation is completed, the pressure is released manually, and the piston of the pipe pressing pliers is slow in resetting speed, so that the working efficiency of the pipe pressing pliers is extremely low.
2. The transmission shaft has small output torque, low transmission efficiency and large abrasion, so that the product has large power consumption and weak continuous working capacity.
Disclosure of Invention
The invention aims to provide the automatic oil return type hydraulic pipe tongs which are simple in structure, convenient to operate, large in output torque, long in single-use time and high in working efficiency.
The purpose of the invention is realized in the following way:
an automatic oil return type hydraulic pipe tongs comprises a pump body, wherein a hydraulic cavity is formed in the pump body, and a plunger capable of reciprocating up and down is arranged in the hydraulic cavity; the oil inlet end of the hydraulic cavity is connected with an oil bag through an oil inlet valve; the oil outlet end of the hydraulic cavity is connected with an oil cylinder of the oil cylinder assembly through an oil outlet valve; the method is characterized in that:
an oil inlet cavity is arranged at the rear end part of the oil cylinder, an automatic oil return valve core, an automatic oil return spring and an automatic oil return plug are arranged in the oil inlet cavity, an oil outlet hole communicated with the oil bag is formed in the automatic oil return plug; the outer end part of the automatic oil return valve core is provided with a sealing head;
a valve core liquid inlet channel is arranged in the automatic oil return valve core, an oil cylinder oil inlet channel is arranged on the side wall of the oil inlet cavity, and the hydraulic cavity is communicated with the piston cavity through the valve core liquid inlet channel and the oil cylinder oil inlet channel;
when the oil inlet cavity is used for oil inlet, the oil inlet end and the oil outlet end of the valve core liquid inlet channel generate pressure difference, and the sealing head overcomes the elasticity of the automatic oil return spring and seals the oil outlet.
Preferably, the valve core liquid inlet channel comprises a mounting hole axially formed in the inner end of the automatic oil return valve core, and a first filter screen is mounted in the mounting hole through a clamp spring; and a small liquid outlet hole communicated with an oil inlet channel of the oil cylinder is formed in the inner end wall of the mounting hole.
Preferably, a piston cavity is axially formed in the front end of the oil cylinder, a piston assembly is arranged in the piston cavity, and the piston assembly comprises a piston, a piston rod and a piston return spring; the piston divides the piston cavity into a spring chamber and a hydraulic chamber, and the side wall of the oil cylinder is provided with more than one oil return channel communicated with the oil bag, and the oil return channel is communicated with the spring chamber.
Preferably, the piston and the piston rod are internally provided with a safety valve mounting cavity, the safety valve mounting cavity is internally provided with a safety valve, and the end face of the piston is provided with an overflow hole;
the safety valve comprises a safety valve core movably arranged in the piston and a pressure regulating screw axially screwed in the piston rod, and the pressure regulating screw is used for abutting the safety valve core on the overflow hole through a safety valve spring;
and the side wall of the safety valve installation cavity is provided with a safety valve oil outlet which is communicated with the spring chamber.
Preferably, the end face of the oil cylinder is provided with a liquid inlet groove, the liquid inlet groove is provided with a plurality of branches, the end face of the oil cylinder and the end face of the pump body are fixedly connected with each other to form a liquid inlet passage, and one branch of the liquid inlet passage is connected with an oil inlet valve; the other branches of the liquid inlet passage are communicated with the oil bag through a second filter screen.
Preferably, the oil cylinder and the pump body are provided with a manual pressure relief channel which is communicated with the oil inlet cavity and the oil bag, the manual pressure relief channel is provided with a pressure relief valve plug, the pressure relief valve plug is provided with a drain hole, and the pressure relief valve plug is arranged on the connecting surface of the oil cylinder and the pump body; a relief valve core is axially arranged in the pump body and is abutted to the drain hole through a relief valve spring;
a pressure release rod is radially arranged in the pump body, the outer end of the pressure release rod is arranged on the outer wall of the pump body through a pressure release rod reset spring; a limiting groove is formed in the middle of the pressure release rod, and a limiting pin is arranged in the limiting groove; the inner end part of the pressure release rod is provided with a wedge surface, and the wedge surface is arranged at the end part of the valve core of the pressure release valve and is pressed by the pressure release rod to realize the axial movement and pressure release of the valve core of the pressure release valve.
Preferably, the rotating device comprises a transmission shaft arranged on the pump body, a planetary gear set and a motor are arranged at the end part of the transmission shaft, the planetary gear set comprises a plurality of planetary gears sleeved at the end part of the transmission shaft, and a motor gear fixed on the motor is arranged at the center of the planetary gears; the periphery of the planetary gear is sleeved with a gear ring, the gear ring is arranged on a motor, and the motor is fixed on a pump body through a flange;
the other end part of the transmission shaft is sleeved with an eccentric device, the eccentric device is connected with the plunger, and the eccentric device is movably arranged on the pump body; the plunger realizes up-and-down reciprocating motion through the rotation of the transmission shaft.
Preferably, the eccentric device comprises an eccentric sleeve fixedly arranged on the transmission shaft, the periphery of the eccentric sleeve is sleeved with a bearing sleeve through a needle roller and a retainer assembly, the periphery of the bearing sleeve is sleeved with a plunger limiting sleeve, and the plunger limiting sleeve is fixedly connected with a plunger; the pump body is provided with a limiting plunger and the limiting mechanism moves left and right of the limiting sleeve.
Preferably, the clamp head assembly comprises a clamp head mounting seat fixedly arranged at the front end part of the oil cylinder, a guide wheel seat is arranged in the clamp head mounting seat, the guide wheel seat is arranged at the outer end part of the piston rod, and two idler wheels are arranged on the guide wheel seat; the end part of the clamp head installation seat is fixedly provided with a clamping head through a clamp head pin.
Preferably, the control system comprises a circuit board for controlling the motor to rotate, and a manual button is arranged on the circuit board; the shell is also provided with a display screen and an illuminating lamp which are connected with the circuit board.
Compared with the prior art, the invention has the following outstanding and beneficial technical effects:
when the motor stops rotating, the automatic oil return valve core resets under the action of the automatic oil return spring, high-pressure hydraulic oil in the hydraulic chamber directly enters the oil bag from the oil outlet, the distance of the oil outlet channel is short, and the piston can quickly reset under the action of the piston return spring until the piston returns to the original state before working. The design of the automatic oil return assembly can enable the piston to be quickly reset, save reset time and greatly improve working efficiency.
The safety valve is arranged in the safety valve mounting cavity of the piston, so that the mounting structure is optimized, the pressure value of the safety valve is regulated in the aspect of changing the clamping head, and different safety valve values can be regulated conveniently according to different clamping heads, thereby being beneficial to improving the quality of the pipe joint.
According to the invention, the liquid inlet groove of the oil cylinder and the end face of the pump body are mutually fixedly connected to form a liquid inlet passage, and one branch of the liquid inlet passage is connected with an oil inlet valve; the other branches of the liquid inlet passage are communicated with the oil bag through the second filter screen, the liquid inlet passage is simple in structure, and when the plunger moves upwards each time, the oil absorption of the hydraulic cavity each time is increased, and the working efficiency is guaranteed.
The automatic oil return assembly, the piston assembly and the safety valve are all arranged in the oil path structure, each part contacted by the hydraulic oil can be lubricated, the abrasion of parts such as a piston rod, a piston return spring, a safety valve return spring, an automatic oil return valve core, an automatic oil return spring and the like is reduced, and the stability and the service life of the structure are improved.
The planetary gear set speed reducer can increase the output torque and the working efficiency of the transmission shaft, save energy and prolong the service time.
The invention adopts the eccentric component as the power transmission component, reduces the energy consumption, reduces the abrasion energy consumption and has the characteristic of high installation efficiency.
In addition, the invention has strong applicability, simple operation and light structure.
Drawings
FIG. 1 is a schematic illustration of the present invention is a schematic structural diagram of the (c).
Fig. 2 is a schematic view of the internal structure of the present invention with half of the housing removed.
Fig. 3 is a cross-sectional view of the present invention.
Fig. 4 is a cross-sectional view of the cylinder assembly and pump body assembly of the present invention.
FIG. 5 is a cross-sectional view of the interior of the oil feed chamber at A-A in FIG. 4.
FIG. 6 is a cross-sectional view of the oil inlet valve and the oil outlet valve at B-B in FIG. 7.
FIG. 7 is a schematic view of the pump body interface at C-C in FIG. 4.
Fig. 8 is an exploded view of the cylinder and automatic oil return assembly of the present invention.
Fig. 9 is an exploded view of the piston assembly of the present invention.
Fig. 10 is a cross-sectional view of a manual pressure relief structure of the present invention.
Fig. 11 is a schematic view of the structure of the spring chamber and the relief valve return passage of the present invention.
Fig. 12 is an exploded view of the pump body assembly of the present invention.
FIG. 13 is a rotary motion of the present invention a structural schematic diagram of the structure.
Fig. 14 is a schematic view of the pump body assembly of the present invention.
FIG. 15 is a schematic diagram of a configuration of the planetary gear set at E-E in FIG. 13.
Fig. 16 is a schematic view of the eccentric and plunger of fig. 14 at F-F.
Figure 17 is a cross-sectional view of a binding clip assembly of the present invention.
Fig. 18 is an exploded view of the binding clip assembly of the present invention.
In the figure: 1-an oil cylinder collar; 3-oil bags; 4-flange collar; 6-planetary gears; 7-a gear ring; 8-motor gears; 11-an electric motor; 13-a power supply; 15-lighting lamp; 17-a housing; 19-a protective belt; 20-a circuit board; 22-rubber pressure release button; 26-a display screen; 28-manual button; 31 A-A first filter screen; 31 b-a second filter screen; 35-a pump body; 36-a pressure release lever return spring; 37-a pressure release lever; 38-front drive bearings; 39-eccentric sleeve;
40-limiting pins; 41-needle roller and cage assembly; 43-bearing sleeve; 44-a gasket; 45-embedding; 46-rear drive bearings; 47-oil seal; 48-a relief valve plug; 49-a relief valve spool;
50-a relief valve spring; 51-a guide sleeve; 52-a plunger stop collar; 53-plunger; 54-cylindrical pins; 55-flanges; 58-connecting piece; 59-a drive shaft; 60-rolling pin;
63-an oil cylinder; 65-an automatic oil return valve core; 66-valve core sealing rings; 67-an automatic oil return spring; 69-an automatic oil return plug;
72-a piston; 73-a relief valve spool; 74-a relief valve spring; 76-pressure regulating screws; 78-a piston rod;
80-a piston return spring; 81-a clamp head mounting seat; 82-a clamp pin spring; 84-clamp head a limiting pin; 86-piston plug; 89-a guide wheel seat;
90-limit screws; 91-a roller; 93-clamp head a pin; 94-a clamp pin handle; 96-clamping head;
301-an oil inlet valve; 302, an oil outlet valve; 351—a hydraulic chamber; 352-stop collar a mounting groove; 511-a rotating groove; 531-flanging;
632-oil inlet chamber; 633-spring chamber; 634-hydraulic chamber; 635-an oil return passage; 636-a liquid inlet tank; 651-seal head; 652-small liquid outlet holes; 653-machining the ring groove; 654-radial direction an oil inlet hole; 691-oil outlet holes;
721-overflow aperture; 722-a safety valve oil outlet hole.
Detailed Description
The invention is further described in the following embodiments with reference to the figures, see fig. 1-18:
1-3, an automatic oil return type hydraulic pipe pressing clamp comprises a shell 17, wherein a pump body assembly is arranged in the shell 17, an oil cylinder assembly is arranged at the front end of the pump body assembly, a clamp head assembly is arranged at the end part of the oil cylinder assembly, and a clamping head 96 is arranged on the clamp head assembly; the pump body assembly comprises a rotating device, and a motor 11 of the rotating device is connected with a power supply 13 and a control system. The power supply 13 is a rechargeable battery and is arranged at the tail end of the hydraulic clamp, when the electric quantity is used up, the rechargeable battery can be directly dismounted, and meanwhile, the standby battery is inserted, so that the hydraulic clamp can work uninterruptedly. Or the motor 11 may be connected to a power plug through a converter, and the power plug may be connected to the mains.
As shown in fig. 4-6, the pump body assembly comprises a pump body 35, a hydraulic cavity 351 is formed in the pump body 35, a plunger 53 capable of reciprocating up and down is arranged in the hydraulic cavity 351, and an oil inlet end of the hydraulic cavity 351 is connected with an oil bag 3 through an oil inlet valve 301; the oil outlet end of the hydraulic cavity 351 is connected with the oil cylinder 63 of the oil cylinder assembly through the oil outlet valve 302.
An oil inlet cavity 632 is radially formed in the rear end portion of the oil cylinder 63, an automatic oil return valve core 65, an automatic oil return spring 67 and an automatic oil return plug 69 fixed at the end portion of the oil inlet cavity 632 are movably arranged in the oil inlet cavity 632 in an axial direction, and the automatic oil return plug 69 is provided with an oil outlet hole communicated with the oil bag 3; the outer end of the automatic oil return valve core 65 is provided with a sealing head 651, when the oil inlet chamber 632 continuously inlets oil, the pressure of the oil inlet end of the automatic oil return valve core 65 is greater than the pressure of the oil outlet end of the automatic oil return valve core 65, the automatic oil return valve core 65 moves to the outer end, so that the sealing head 651 is sealed on the oil outlet hole through the automatic oil return spring 67, and the hydraulic chamber 634 of the piston cavity is pressurized to push the piston 72 and the piston rod 78 to move axially.
The inner end part of the automatic oil return valve core 65 is provided with a valve core liquid inlet channel, the side wall of the oil inlet cavity 632 between the automatic oil return valve core 65 and the automatic oil return plug 69 is provided with an oil cylinder oil inlet channel, and the hydraulic cavity 351 is communicated with the piston cavity through the valve core liquid inlet channel and the oil cylinder oil inlet channel.
As shown in fig. 5, preferably, the valve core liquid inlet channel includes a mounting hole axially opened at the inner end of the automatic oil return valve core 65, and a first filter screen 31a is installed in the mounting hole through a snap spring; a small liquid outlet hole 652 communicated with an oil inlet channel of the oil cylinder is formed in the inner end wall of the mounting hole, the aperture of the small liquid outlet hole 652 is smaller than that of an oil outlet hole of the oil outlet valve, when the oil inlet amount is larger than the oil outlet amount in the oil inlet channel of the valve core, the oil quantity is continuously increased, the pressure is continuously increased, and a sealing head of the automatic oil return valve core can outwards move to seal the oil outlet hole of the automatic oil return plug 69. The tail part of the sealing head 651 is provided with a radial communication hole penetrating through the liquid outlet small hole 652, so that the valve core liquid inlet channel is communicated with the piston cavity.
Preferably, a valve core sealing ring 66 is arranged on the outer end wall of the automatic oil return valve core 65, so that the tightness is improved; the side wall of the middle part is provided with a processing annular groove 653, and the side wall of the inner end part is provided with more than one radial oil inlet hole 654.
As shown in fig. 4 and 8, preferably, a piston cavity is axially formed at the front end of the oil cylinder 63, the end of the piston cavity passes through a piston plug 86, and a small hole for filling oil into the oil bag 3 is formed in the piston plug 86 and is sealed by a steel ball and the plug. A piston assembly is arranged in the piston cavity, and comprises a piston 72, a piston rod 78 and a piston return spring 80; the piston 72 divides the piston cavity into a spring chamber 633 and a hydraulic chamber 634, the sidewall of the oil cylinder 63 is provided with more than one oil return channel 635 communicated with the oil bag 3, and the oil return channel 635 is communicated with the spring chamber 633, which is beneficial to resetting the piston 72.
Preferably, a safety valve installation cavity is formed inside the piston 72 and the piston rod 78, a safety valve is arranged in the safety valve installation cavity, and an overflow hole 721 is formed in the end face of the piston 72.
The safety valve comprises a safety valve core 73 movably arranged in the piston 72 and a pressure regulating screw 76 axially screwed in the piston rod 78, and the pressure regulating screw 76 abuts the safety valve core 73 on an overflow hole 721 through the safety valve spring 74; the pressure regulating screw 76 is welded with a nut, and the overflow value of the safety valve is regulated by rotating the pressure regulating screw 76, so that the service life of the pipe pressing pliers is ensured.
In the pressure maintaining stage of the pipe tongs, the safety valve works, and the piston 72 stops moving, so that the quality of the pipeline connection is improved.
The side wall of the safety valve installation cavity is provided with a safety valve oil outlet hole 722, and the safety valve oil outlet hole 722 is communicated with a spring chamber 633.
As shown in fig. 7, 8 and 12, preferably, a liquid inlet tank 636 is formed on an end surface of the oil cylinder 63, a plurality of branches are disposed on the liquid inlet tank 636, the oil cylinder 63 and the pump body 35 are fixedly connected with each other and form a Y-shaped liquid inlet passage with the liquid inlet tank 636, and one branch of the liquid inlet passage is connected with the oil inlet valve 301; the ports of the rest branches of the liquid inlet passage are arranged on the pump body 35 and are communicated with the oil bag 3 through the second filter screen 31 b. The liquid inlet passage is simple in structure, and when the plunger is lifted up each time, the oil absorption of the hydraulic cavity each time is facilitated, and the working efficiency is guaranteed.
As shown in fig. 10, preferably, the cylinder 63 and the pump body 35 are provided with a manual pressure release channel which is communicated with the oil inlet cavity 632 and the oil bag 3, the manual pressure release channel is provided with a pressure release valve plug 48, the pressure release valve plug 48 is provided with a drain hole, and the pressure release valve plug 48 is arranged on the connecting surface of the cylinder 63 and the pump body 35 through a rectangular ring; a relief valve spool 49 is axially arranged in the pump body 35, and the relief valve spool 49 is abutted against the drain hole through a relief valve spring 50.
The pressure release rod 37 is radially arranged in the pump body 35, the outer end of the pressure release rod 37 is arranged on the outer wall of the pump body 35 through the pressure release rod return spring 36, and the rubber pressure release button 22 is arranged at a corresponding position on the shell 17. A limiting groove is formed in the middle of the pressure release rod 37, and a limiting pin 40 is arranged in the limiting groove; the inner end of the pressure release rod 37 is provided with a wedge surface, the wedge surface is arranged on an installation slot at the end of the pressure release valve core 49, and the pressure release rod 37 is pressed to realize the axial movement of the pressure release valve core 49 and the pressure release of the oil inlet cavity 632 and the hydraulic chamber.
As shown in fig. 4, preferably, the oil bag 3 is sleeved outside the pump body 35, one end of the oil bag 3 is sealed and fixed on the outer wall of the oil cylinder 63 through the oil cylinder collar 1, and the other end of the oil bag 3 is sealed and fixed on the outer wall of the flange 55 through the flange collar 4. The installation of the oil bag 3 can save the design space of the invention, and the structure is more compact and beautiful.
As shown in fig. 12 to 16, preferably, the rotating means comprises a transmission shaft 59 mounted on the pump body 35 through front and rear transmission bearings 38, 46, the end of the transmission shaft 59 is provided with a planetary gear set and a motor 11, the planetary gear set comprises a plurality of planetary gears 6 sleeved on the end of the transmission shaft 59, and the center of the planetary gears 6 is provided with a motor gear 8 fixed on the motor 11; the outer periphery of the planetary gear 6 is sleeved with a gear ring 7, the gear ring 7 is arranged on the motor 11, and the motor 11 is fixed on the pump body 35 through a flange 55. The planetary gear set reduction device can increase the output torque and the working efficiency of the transmission shaft 59, save energy and have long service life.
Preferably, the end of the pump body 35 is provided with a flange 55 for mounting the motor 11, an oil seal 47 and a rear drive bearing 46 for mounting a drive shaft 59 are arranged in the flange 55, and the oil seal 47 can seal the planetary gear set.
The other end part of the transmission shaft 59 is sleeved with an eccentric device, the eccentric device is connected with the plunger 53, and the eccentric device is movably arranged on the pump body 35; the plunger 53 reciprocates up and down by rotation of a transmission shaft 59.
Preferably, the eccentric device comprises an eccentric sleeve 39 fixedly arranged on a transmission shaft 59 through a cylindrical pin 54, a bearing sleeve 43 is sleeved on the periphery of the eccentric sleeve 39 through a needle roller and retainer assembly 41, a plunger limiting sleeve 52 is sleeved on the periphery of the bearing sleeve 43, and a plunger 53 is fixedly connected with the plunger limiting sleeve 52; the pump body 35 is provided with a limiting mechanism for limiting the left-right movement of the plunger limiting sleeve 52. The illustrated bearing housing 43 rotates one revolution and the plunger 53 reciprocates up and down once, and when the motor 11 is continuously rotated, the plunger 53 reciprocates up and down all the time.
As shown in fig. 16, preferably, the pump body 35 is provided with a stop collar mounting groove 352, the stop collar mounting groove 352 is internally provided with the stop mechanism, the stop mechanism includes a connecting piece 58 fixed on the pump body 35 at two sides of the stop collar mounting groove 352 and a guide sleeve 51 sleeved on the connecting piece 58, and the guide sleeve 51 is installed in the stop collar mounting grooves 352 at the left and right sides of the plunger stop collar 52.
Preferably, a rotation groove 511 adapted to the bearing sleeve 43 is provided in the guide sleeve 51, the distance between the upper end and the lower end of the rotation groove 511 is the same as the diameter of the bearing sleeve 43, a rotation space exists between the left end and the right end of the rotation groove 511 and the bearing sleeve 43, and the bearing sleeve 43 rotates in the rotation groove 511 to realize the up-and-down reciprocating motion of the plunger 53 and the plunger limiting sleeve 52.
Preferably, the upper end of the plunger 53 is provided with an outward flange 531, the outward flange 531 is fixed to the guide bush 51 by abutting the bearing bush 43. Or the plunger 53 is directly fixed to the plunger stop collar 52.
Preferably, a bushing 45 and a gasket 44 are arranged between the eccentric device and the flange 55, the bushing 45 connects the eccentric bushing 39 and the rear transmission bearing 46, and the gasket 44 is sleeved outside the bushing 45 and connects the eccentric bushing 39 and the flange 55. The gasket 44 may seal the rear drive bearing 46.
As shown in fig. 17 and 18, the binding clip assembly preferably includes a binding clip mounting base 81 fixedly arranged at the front end portion of the oil cylinder 63, a guide wheel base 89 is arranged in the binding clip mounting base 81, the guide wheel seat 89 is arranged at the outer end part of the piston rod 78 through a limit screw 90, and two rollers 91 are arranged on the guide wheel seat 89; the end of the binding clip installation seat 81 is detachably fixed with a clamping head 96 through a binding clip pin 93. The end of the binding clip pin is provided with a binding clip pin handle 94, the binding clip pin 93 is provided with a limit groove, and the binding clip pin 93 is fixed on the binding clip 81 through the binding clip limit pin 84 and the binding clip pin spring 82. The clamp head 95 with different apertures can be replaced by rotating the clamp head pin handle 94, and the clamp head is convenient to install and wide in application range.
As shown in fig. 2, the control system preferably includes a circuit board 20 for controlling the rotation of the motor 11, a manual button 28 is provided on the circuit board 20, the manual button 28 is pressed, the motor 11 operates, when the piston 72 is continuously acted on by the hydraulic chamber 634, the output power of the motor 11 is changed, and a detection system on the circuit board 20 sends a signal for stopping the motor 11 according to the current of the motor 11. The shell 17 is also provided with a display screen 26 and an illuminating lamp 15 which are connected with the circuit board 20, and basic parameters of motor operation, such as current, voltage, temperature, the number of times of motor rotation and the like, are displayed on the display screen 26. The illuminating lamp 15 is used for illuminating in a certain black paint environment, is convenient to develop work, and increases the application range of the pipe pressing pliers.
Preferably, the shell 17 is also provided with a protective belt 19, which is convenient to carry.
Working principle:
the motor 11 is controlled to be started through the manual button 28, the transmission shaft 59 is driven to rotate through the reduction of the planetary gear set, and the plunger 53 is driven to reciprocate up and down through the eccentric device.
The plunger 53 moves upwards, and the hydraulic cavity 531 absorbs oil from the oil bag through the oil inlet valve 301; the plunger 53 moves downward, the hydraulic chamber 531 discharges oil to the oil inlet chamber 632 through the oil discharge valve 302, and the oil inlet chamber 632 is continuously pressurized by the up-and-down reciprocation of the plunger 53. At this time, the flow rate of the liquid inlet end of the automatic oil return valve core 65 is greater than the flow rate of the liquid outlet end thereof, and the automatic oil return valve core 65 overcomes the acting force of the automatic oil return spring 67 and seals the oil outlet hole of the automatic oil return plug 69. Simultaneously, the hydraulic chamber of the oil cylinder 63 is continuously pressurized, so that the piston 72 is pushed to move, and the clamping head 96 is driven to realize pipeline crimping.
When the crimping of the pipeline is successful, the detection system on the circuit board 20 detects the basic parameters of the motor 11, such as the time for sending out the signal for stopping the motor 11 according to the current of the motor 11. When the current reaches a preset value, the motor 11 stops operating. This time, the pressure of the liquid inlet end and the liquid outlet end of the automatic oil return valve core 65 is the same, under the action of the automatic oil return spring 67, the automatic oil return valve core 65 is reset, the oil outlet is opened, the hydraulic chamber 634 is communicated with the oil pocket, high-pressure hydraulic oil in the hydraulic chamber 634 can quickly return to the oil pocket through the oil outlet, and under the action of the piston return spring 80, the piston 72 can quickly return.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention in this way, therefore: all equivalent changes in structure, shape and principle of the invention should be covered in the scope of protection of the invention.
Claims (9)
1. An automatic oil return type hydraulic pipe tongs comprises a pump body (35), wherein a hydraulic cavity (351) is formed in the pump body (35), and a plunger (53) capable of reciprocating up and down is arranged in the hydraulic cavity (351); the oil inlet end of the hydraulic cavity (351) is connected with the oil bag (3) through an oil inlet valve (301); the oil outlet end of the hydraulic cavity (351) is connected with an oil cylinder (63) of the oil cylinder assembly through an oil outlet valve (302); the method is characterized in that:
an oil inlet cavity (632) is formed in the rear end portion of the oil cylinder (63), an automatic oil return valve core (65), an automatic oil return spring (67) and an automatic oil return plug (69) are arranged in the oil inlet cavity (632), and an oil outlet (691) communicated with the oil bag (3) is formed in the automatic oil return plug (69); outer part of automatic oil return valve core (65) the end part is provided with a sealing head (651);
a valve core liquid inlet channel is arranged in the automatic oil return valve core (65), an oil cylinder oil inlet channel is arranged on the side wall of the oil inlet cavity (632), and the hydraulic cavity (351) is communicated with a piston cavity through the valve core liquid inlet channel and the oil cylinder oil inlet channel;
the valve core liquid inlet channel comprises a mounting hole axially formed in the inner end of the automatic oil return valve core (65), a liquid outlet small hole (652) communicated with the oil cylinder oil inlet channel is formed in the inner end wall of the mounting hole, and the aperture of the liquid outlet small hole (652) is smaller than that of the oil outlet hole of the oil outlet valve;
when the oil inlet cavity (632) is used for oil inlet, the oil inlet end and the oil outlet end of the valve core liquid inlet channel generate pressure difference, and the sealing head (651) overcomes the elasticity of the automatic oil return spring (67) and seals the oil outlet (691);
the front end part of the oil cylinder (63) is axially provided with a piston cavity, a piston assembly is arranged in the piston cavity, and the piston assembly comprises a piston (72), a piston rod (78) and a piston return spring (80); the piston (72) divides the piston cavity into a spring chamber (633) and a hydraulic chamber (634), an oil return channel (635) is arranged on the side wall of the oil cylinder (63), and the oil return channel (635) is communicated with the spring chamber (633);
a safety valve installation cavity is formed in the piston (72) and the piston rod (78), a safety valve is arranged in the safety valve installation cavity, and an overflow hole (721) is formed in the end face of the piston (72);
the safety valve comprises a safety valve core (73) movably arranged in the piston (72) and a pressure regulating screw (76) axially screwed in the piston rod (78), and the pressure regulating screw (76) is used for abutting the safety valve core (73) on the overflow hole (721) through the safety valve spring (74);
and a safety valve oil outlet hole (722) is formed in the side wall of the safety valve installation cavity, and the safety valve oil outlet hole (722) is communicated with a spring chamber (633).
2. An automatic oil return type hydraulic pipe tongs as claimed in claim 1 wherein: a first filter screen (31 a) is arranged in the mounting hole through a clamp spring.
3. An automatic oil return type hydraulic pipe tongs as claimed in claim 1 or 2, wherein: the side wall of the oil cylinder (63) is provided with more than one oil return channel (635) communicated with the oil bag (3).
4. An automatic oil return type hydraulic pipe tongs as claimed in claim 1 wherein: a liquid inlet groove (636) is formed in the end face of the oil cylinder (63), a plurality of branches are arranged on the liquid inlet groove (636), the end faces of the liquid inlet groove (636) and the pump body (35) are fixedly connected with each other to form a liquid inlet passage, and one branch of the liquid inlet passage is connected with the oil inlet valve (301); the rest branches of the liquid inlet passage are communicated with the oil bag (3) through a second filter screen (31 b).
5. An automatic oil return type hydraulic pipe tongs as claimed in claim 1, 2 or 4, wherein: a manual pressure relief channel which is communicated with the oil inlet cavity (632) and the oil bag (3) is formed in the oil cylinder (63) and the pump body (35), a pressure relief valve plug (48) is arranged on the manual pressure relief channel, a drain hole is formed in the pressure relief valve plug (48), a pressure relief valve core (49) is axially arranged in the pump body (35), and the pressure relief valve core (49) is abutted to the drain hole through a pressure relief valve spring (50);
a pressure release rod (37) is radially arranged in the pump body (35), and the outer end of the pressure release rod (37) is arranged on the outer wall of the pump body (35) through a pressure release rod return spring (36); the inner end part of the pressure release rod (37) is provided with a wedge surface, and the wedge surface is arranged at the end part of the pressure release valve core (49) and is pressed by the pressure release rod (37) to realize the axial movement of the pressure release valve core (49).
6. An automatic oil return type hydraulic pipe tongs as claimed in claim 1 wherein: a transmission shaft (59) is arranged on the pump body (35), a planetary gear set and a motor (11) are arranged at the end part of the transmission shaft (59), and the motor (11) is fixed on the pump body (35) through a flange (55);
the other end part of the transmission shaft (59) is sleeved with an eccentric device, the eccentric device is connected with the plunger (53), and the eccentric device is movably arranged on the pump body (35); the plunger (53) reciprocates up and down by rotation of a transmission shaft (59).
7. An automatic oil return type hydraulic pipe tongs as claimed in claim 6 wherein: the eccentric device comprises an eccentric sleeve (39) fixedly arranged on a transmission shaft (59), a bearing sleeve (43) is sleeved on the periphery of the eccentric sleeve (39) through a needle roller and a retainer assembly (41), a plunger limiting sleeve (52) is sleeved on the periphery of the bearing sleeve (43), and a plunger (53) is fixedly connected with the plunger limiting sleeve (52); and a limiting mechanism for limiting the left-right movement of the plunger limiting sleeve (52) is arranged on the pump body (35).
8. An automatic oil return type hydraulic pipe tongs as claimed in claim 1 or 2 or 4 or 6 or 7, wherein: the end part of the oil cylinder assembly is provided with a clamp head assembly, the clamp head assembly comprises a clamp head installation seat (81) fixedly arranged at the front end part of the oil cylinder (63), a guide wheel seat (89) is arranged in the clamp head installation seat (81), the guide wheel seat (89) is arranged at the outer end part of the piston rod (78), and two idler wheels (91) are arranged on the guide wheel seat (89); the end part of the clamp head mounting seat (81) is fixed with a clamping head (96) through a clamp head pin (93).
9. An automatic oil return type hydraulic pipe tongs as claimed in claim 8 wherein: the control system comprises a circuit board (20) for controlling the motor (11) to rotate, and a manual button (28) is arranged on the circuit board (20); the shell (17) is also provided with a display screen (26) and an illuminating lamp (15) which are connected with the circuit board (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710141360.7A CN106944959B (en) | 2017-03-10 | 2017-03-10 | Automatic oil return type hydraulic pipe tongs |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710141360.7A CN106944959B (en) | 2017-03-10 | 2017-03-10 | Automatic oil return type hydraulic pipe tongs |
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| CN106944959A CN106944959A (en) | 2017-07-14 |
| CN106944959B true CN106944959B (en) | 2024-02-02 |
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| CN201710141360.7A Active CN106944959B (en) | 2017-03-10 | 2017-03-10 | Automatic oil return type hydraulic pipe tongs |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113119009B (en) * | 2021-04-27 | 2023-03-24 | 海南科技职业大学 | Wrench for assembly and manufacturing method thereof |
| CN113550948B (en) * | 2021-07-26 | 2024-06-07 | 浙江飞越机电有限公司 | Pressure relief exhaust structure of hydraulic pipe fitting processing tool |
| CN113649483B (en) * | 2021-07-26 | 2024-04-26 | 浙江飞越机电有限公司 | Multifunctional electric hydraulic pipe fitting processing tool |
| CN114738267A (en) * | 2022-04-16 | 2022-07-12 | 台州巨力工具股份有限公司 | Oil supply mechanism and reset system of oil pump |
| CN114738266A (en) * | 2022-04-16 | 2022-07-12 | 台州巨力工具股份有限公司 | Electric hydraulic tool |
| CN114738263A (en) * | 2022-04-16 | 2022-07-12 | 台州巨力工具股份有限公司 | Oil control system |
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| US5125324A (en) * | 1988-02-10 | 1992-06-30 | Daia Industry Co. Ltd. | Portable hydraulically operated device incorporating automatic drain valve |
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| CN106944959A (en) | 2017-07-14 |
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Effective date of registration: 20240107 Address after: 317605 Wujia village, Chumen Town, Yuhuan City, Taizhou City, Zhejiang Province Applicant after: TAIZHOU RUIQI TOOLS CO.,LTD. Address before: Room 102, Unit 2, Building 19, Liulang Community, Chumen Town, Yuhuan County, Taizhou City, Zhejiang Province, 317605 Applicant before: Huang Jianxin |
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