CN205219041U - Hydraulic tool - Google Patents

Abstract

The utility model relates to a hydraulic tool, it includes working cell, drive unit and pressure release unit. The working cell is suitable for to be operated the work piece. Drive unit constructs in pairs, and the working cell drives to including the cylinder body, set up in the cylinder body and the moving part that can remove between initial position and operating position and be used for the elastic component towards initial position bias voltage moving part, wherein, cylinder body and moving part have been injectd and have been waited to fill pressurized fluid with the cavity towards operating position bias voltage moving part. The pressure release unit includes the hydraulic pressure relief valve. The hydraulic pressure relief valve is constructed and is opened so that the cavity pressure release when fluid pressure in the cavity reaches predetermined threshold value. Hydraulic tool constructs and allows the moving part to instruct in order to provide the vision to the user towards initial position removal predetermined distance after the hydraulic pressure relief valve is opened, and the predetermined distance is less than the distance from operating position to initial position.

Description

Hydraulic tool

Technical field

The utility model relates to a kind of hydraulic tool, particularly a kind of hydraulic tool of the workpiece for such as pipe.

Background technology

The content of this part provide only the background information relevant to the disclosure, and it may not form prior art.

Usually, the hydraulic tool (in some cases also referred to as crimping tool) for crimping the workpiece of such as pipe comprises switch, motor, pump, hydraulic cylinder and working cell (in some cases also referred to as crimping unit).Crimping unit comprises moving part and static part.Moving part is arranged on the projecting end of piston rod.Like this, after crimping tool starts, the moving part that fluid pressure in hydraulic cylinder promotes piston rod and crimping unit moves together, crimping unit moving part in the process of translation little by little near static part, reduce the space between moving part and static part thus, thus workpiece is therebetween crimped.

In addition, above-mentioned crimping tool is after completing crimping process, and relief valve is opened with by complete for the pressure in hydraulic cylinder pressure release, make the crimping moving part of unit and the piston rod of hydraulic cylinder and piston directly movement be back to initial position.Therefore, when crimping tool completes crimping to workpiece, user is difficult to know that crimping process completes and always by compressing switch, motor run until above-mentioned movable member moves be back to initial position always.In upper once crimping process, pressure in hydraulic cylinder needs again to rise from initial pressure, causes that crimping process is longer, operating efficiency reduces.

For some conventional crimping tool, after relief valve is by the pressure pressure release in hydraulic cylinder, back-moving spring in hydraulic cylinder needs to provide enough large elastic force to be back to initial position the crimping moving part of unit and the piston rod of hydraulic cylinder and piston can be moved.Therefore, higher to the requirement of back-moving spring.

Therefore, expect in this area a kind of can Optimization Work process the compact hydraulic tool of increasing work efficiency.

Utility model content

An object of the present utility model is to provide a kind of hydraulic tool of Optimization Work process, and this hydraulic tool can provide the vision of end-of-job to indicate for user.

Another object of the present utility model is to provide a kind of hydraulic tool of increasing work efficiency.

Another object of the present utility model is to provide a kind of compact hydraulic tool of small volume.

One or more in above-mentioned purpose can be realized by following proposal: a kind of hydraulic tool comprises working cell, driver element and pressure release unit.Working cell is suitable for operating workpiece.Driver element is configured to drive working cell, and comprise cylinder body, be arranged in cylinder body and can movement between initial position and operating position moving part and for the elastic component towards initial position bias movable part, wherein, cylinder body and moving part define pressure fluid to be filled with the chamber towards operating position bias movable part.Pressure release unit comprises hydraulic pressure releasing valve.Open to make chamber pressure release when hydraulic pressure releasing valve constitution becomes the fluid pressure in chamber to reach predetermined threshold.Hydraulic tool is configured to after hydraulic pressure releasing valve is opened, allow moving part to move preset distance to provide vision to indicate to user towards initial position, and preset distance is less than the distance from operating position to initial position.

Adopt such scheme, due to moving part after opening at hydraulic pressure releasing valve, only partly rollback is (namely, non-rollback is to initial position), therefore user is visually perceptible for this partial rollback process, can know that the one action process of hydraulic tool completes thus.At this moment, user can make motor stop, to save the energy of such as battery.This point, advantageous particularly when working in the wild.In addition, due to moving part only partly rollback, therefore, the pressure in the chamber of driver element is higher than initial pressure.Like this, such as, when needing to operate next workpiece, the rise time of the pressure in the chamber of driver element can be shortened, thus the operating efficiency of hydraulic tool can be improved.

Preferably, when described moving part moves towards described initial position, described working cell provides the elastic restoring force towards moving part described in described initial position bias voltage together with described elastic component, and when described moving part arrives described preset distance, the elastic restoring force of described working cell is close to zero.When working cell elastic deformation can occur and provide the elastic force towards initial position bias movable part, the load of the elastic component of driver element can be reduced, that is, reduce the requirement of the elastic component to driver element.

Preferably, described pressure release unit also comprises manual relief valve, and described manual relief valve is constructed to be permeable to manual unlocking with by described chamber pressure release, makes described moving part can be back to described initial position.Like this, after all working process of hydraulic tool completes, that is, when no longer needing to process workpiece, manual relief valve can be opened and make hydraulic tool return to original state.

Preferably, described hydraulic pressure releasing valve constitution becomes to allow described chamber to be communicated with fluid source via the fluid passage be arranged in described cylinder body.

Preferably, described fluid source is arranged in the space limited by described cylinder body, and described hydraulic pressure releasing valve is arranged in described fluid source.

Preferably, described manual relief valve is the form of check valve.Such as, manual relief valve comprises: the valve guard be fixedly installed, the spool coordinated with described valve guard, for making the valve rod of described spool movement and the first elastic component for making described valve rod reset, and described spool construction becomes the anti-fluid when abutting described valve guard to be allowed fluid by described manual relief valve when moving away described valve guard by described manual relief valve.Preferably, spool is hemispherical, and the hemisphere face of described spool coordinates with described valve guard.

Preferably, manual relief valve also comprises for spool described in bias voltage to abut the second elastic component of described valve guard, such as, and spring.

Preferably, described pressure release unit also comprises the control stick for manually opening described manual relief valve, and described control stick is pivotally connected to the housing of described hydraulic tool by pin.

Preferably, hydraulic tool also comprises the integrated pumping unit be arranged in described cylinder body, and described pumping unit is configured to the fluid pump in described fluid source to deliver in described chamber.Pumping unit is integrated in cylinder body, the volume of hydraulic tool can be reduced.

Preferably, hydraulic pressure releasing valve is also configured to arrive preset distance and described pumping unit stops closing after described chamber pumping fluid at described moving part.Like this, after user obtains the vision instruction that one action terminates, motor can be stopped no longer to driver element supplied with pressurised fluid.Now, hydraulic pressure releasing valve can cut out that the pressure in chamber is remained on predeterminated level, is conducive to the pressing time reducing the ensuing course of work, thus shortens the course of work, provides operating efficiency.

Alternatively, pumping unit comprises plunger displacement pump.

Preferably, be provided with in the fluid passage being communicated with described pumping unit and described fluid source and allow fluid to flow into the check valve of described pumping unit from fluid source.Similarly, also can be provided with in the fluid passage being communicated with described pumping unit and described chamber and allow fluid to flow into the check valve of described chamber from described pumping unit.Like this, the safety and stability of system can be provided.

In addition, described preset distance is determined by least one in following item: the described elastic component of described driver element, by the structure of the fluid passage of described hydraulic pressure releasing valve and described chamber, the elastic component of valve plug with closes said fluid channel being used for hydraulic pressure releasing valve described in bias voltage.Certainly, this preset distance can also be determined by other modes well known by persons skilled in the art.

Preferably, roller is arranged on regularly with can working cell described in Direct driver on described moving part, and described roller is exposed to outside or indicates to provide described vision via visual window.By this structure, the course of work (particularly, the course of work of working cell) of user to hydraulic tool can be conducive to and carry out Visual Observations Observations.

Preferably, preset distance is greater than 3mm.Like this, user can be enable to observe visually moving part or roller or working cell whether rollback.If user observes visually moving part or roller or working cell rollback, then the chamber supplied with pressurised fluid that motor can be made to stop and/or making pumping unit stop to driver element, to save the energy.

Can be crimping tool or cutting implement according to hydraulic tool of the present utility model, especially, can be the crimping tool for tubular workpiece or cutting implement.

Accompanying drawing explanation

By the description referring to accompanying drawing, the feature and advantage of one or several embodiment of the present utility model will become easier to understand, wherein:

Fig. 1 is the partial sectional view of the hydraulic tool according to the utility model embodiment, and wherein hydraulic tool is in initial opening (crimping) state;

Fig. 2 is the partial sectional view of the hydraulic tool according to the utility model embodiment, and wherein hydraulic tool is in complete crimped status;

Fig. 3 is the partial sectional view of the hydraulic tool according to the utility model embodiment, and wherein hydraulic tool has completed crimping process and the hydraulic-driven part of hydraulic tool returns preset distance;

Fig. 4 is the cross-sectional schematic of the hydraulic tool according to the utility model embodiment, it illustrates manual relief valve;

Fig. 5 is the cross-sectional schematic of the manual relief valve according to the utility model embodiment, and wherein manual relief valve is in the closed position; And

Fig. 6 is according to the pressure in the hydraulic pressure releasing valve of the hydraulic tool of the utility model embodiment and the figure of time.

Detailed description of the invention

Description related to the preferred embodiment is only exemplary below, and is never the restriction to the utility model and application or usage.Adopt identical Reference numeral to represent identical parts in various figures, therefore the structure of same parts is by no longer repeated description.

Be described according to the hydraulic tool of the utility model embodiment referring to Fig. 1 to Fig. 3.It should be understood that for illustrative purposes, herein for the crimping tool operated pipe so that principle of the present utility model to be described.But the utility model is not limited to crimping tool, such as, the utility model can also be applied to clamp tool, cutting implement, compression tool etc.

See Fig. 1, it illustrates the crimping tool for crimping pipe according to the utility model embodiment.As shown in Figure 1, according to the crimping tool 1 of the utility model embodiment can be the form of hand held electric tool.Crimping tool 1 can comprise crimping unit (or being called working cell) 10 and be connected to the housing 80 of crimping unit 10.Crimping unit 10 can be configured to crimp the workpiece of such as pipe.The driver element 20 for driving crimping unit 10 can be provided with in housing 80, the pressure release unit 30 of pressure release is carried out when exceeding predetermined pressure for the pressure in driver element 20, for hydraulic oil pump being delivered to the pumping unit 40 of driver element 20, for by power transmission to pumping unit 40 to drive the gear unit 50 of pumping unit 40, for providing the power unit 60 of power for the various piece of crimping tool 1, and the switch control unit 70 making power unit 60 open or close.

Although the unit except crimping unit 10 of crimping tool 1 is integrated in housing 80 in illustrated example, but, be understood that one or more unit can independent of housing 80, such as, pumping unit 40, gear unit 50, power unit 60 and/or switch control unit 70 can be arranged on the outside of housing 80 and be connected with other unit in housing 80.In addition, it will be appreciated that, crimping unit 10 can form with housing 80.

In the example shown in the series of figures, crimp unit 10 and comprise two crimping components 11 and 13.These two crimping components 11 and 13 can be the forms of plate, in one plane side by side and be adjacent to arrange.Preferably, crimping component 11 and 13 can have roughly the same structure, and it is roughly symmetrical to close axis therebetween, and wherein, described axis is approximately perpendicular to the longitudinal axis waiting to crimp workpiece (such as, managing) and can be called the axis of symmetry.At this, for convenience of description, the adjacent side (face) of crimping component 11 and 13 is called inner side (face), and its side (face) is away from each other called outside (face).Crimping component 11 and 13 comprises pressure contact portion and separately for driving the drive division of pressure contact portion.In the example shown in the series of figures, pressure contact portion is free end or crimping 117,137, and drive division is and crimping 117,137 contrary drive end 115,135.

In the example shown in the series of figures, crimp the workpiece that the crimping 117,137 of component 11,13 is contiguous to be crimped, and the contiguous driver element 20 of its drive end 115,135.The drive end 115,135 of crimping component 11,13 comprises end face 114,134 separately.On the medial surface of crimping component 11,13, proximate end face 114,134 place is respectively arranged with drive surface 112,132.Preferably, between drive surface 112,132 and end face 114,134, filleted is provided with.Drive surface 112,132 can be the cam surface outstanding towards inner side.On the medial surface of crimping component 11,13, contiguous crimping 117,137 place is respectively arranged with electrolysis 111,131.Electrolysis 111,131 is recessed into side toward the outside from the medial surface of crimping component 11,13 respectively, and the workpiece when processing workpiece is contained in the space limited by electrolysis 111,131.Electrolysis 111,131 can have the shape matched with the exterior contour of pending workpiece.When the crimping tool of aluminium hydraulic pressed connecting pipe and so on, electrolysis 111,131 can be circular shape separately, and aligned with each other will treat crimping piece-holder betwixt.Can be provided with the hole for receiving pin 12 between electrolysis 111 and drive surface 112, making to crimp component 11 can around pin 12 pivotable.Similarly, can be provided with the hole for receiving pin 14 between electrolysis 131 and drive surface 132, making to crimp component 13 can around pin 14 pivotable.When drive surface 112,132 of driver element 20 driving crimping component 11,13, there is deformation and respectively around pin 12,14 pivotable toward the outer side in drive end 115,135, and crimping 117,137 is respectively around pin 12,14 towards inner side pivotable to crimp the workpiece of such as pipe.

Preferably, drive end 115,135 can be formed by the material that certain elastic deformation occurs under the driving effect of driver element 20.Like this, after crimping completes, the deformation energy accumulated in drive end 115,135 can be conducive to partly resisting hydraulic-driven power in driver element 20 to promote that crimping component 11,13 is back to its initial position.Like this, thering is provided with the spring by means of only driver element makes crimping component be back to compared with the situation of the power of initial position, this examples shown can reduce the load of the spring of driver element significantly, thus the distribution of power between all parts optimizing whole hydraulic tool.

Can also comprise according to crimping tool 1 of the present utility model and connect crimping component 11,13 and the side plate 15 crimping component 11,13 being connected to housing 80.Preferably, a side plate 15 can be respectively set in the both sides of crimping component 11,13.Side plate 15 is provided with the hole for receiving pin 12 and 14, crimping component 11 and 13 can link together via pin 12 and 14 by side plate 15 thus.In addition, in the example shown in the series of figures, the hole for receiving pin 16 can also be provided with on side plate 15, wherein by means of pin 16, side plate 15 be connected to such as hydraulic cylinder.In the example shown in the series of figures, the hole for receiving pin 16 is positioned at the axis of symmetry in the hole for receiving pin 12,14.It should be understood that side plate 15 can have any suitable structure realizing above-mentioned functions, and be not limited to illustrated structure.

Driver element 20 is configured to drive crimping component 11,13 respectively around pin 12,14 pivotable under the effect of the pressure of pressure fluid.As shown in the figure, driver element 20 can comprise hydraulic cylinder and be connected to the actuator for driving crimping component 11,13 of hydraulic cylinder.Hydraulic cylinder can comprise cylinder body 21, the piston 23 be arranged in cylinder body 21, the piston rod 25 being connected to piston 23 in the side of piston 23, the return springs be arranged on piston rod 25, such as, and the spring 27 shown in figure.Packed pressurised chamber 26 is formed in the side contrary with back-moving spring 27 of piston 23.When crimping tool 1 operates, by pumping unit 40, pressurized hydraulic oil is pumped in pressurised chamber 26, makes the pressure of the pressure fluid in pressurised chamber 26 can overcome the power of back-moving spring 27 and promote piston 23 and piston rod 25.Piston rod 25 can stretch out from cylinder body 21, for the projecting end driving the actuator of crimping component (being specifically as follows the drive surface of crimping component) can be arranged on piston rod 25.Preferably, as shown in the figure, actuator can comprise two rollers 22 of the drive surface 112,132 for driving crimping component 11,13 respectively, and therefore the frictional resistance that can reduce thus between drive surface 112,132 also can reduce the wearing and tearing caused drive surface 112,132.As mentioned above, cylinder body 21 forms the standing part of driver element 20, and piston rod 25 and piston 23 form the moving part of driver element 20.

Preferably, roller 22 can be mounted on moving part in the following manner: roller 22 can follow moving part translation together, self can rotate simultaneously.Especially, roller 22 can be arranged on the free end of piston rod 25, with can Direct driver working cell 10, can reduce like this to drive frictional force.Preferably, roller 22 can be exposed to outside, or provides the vision instruction once crimping process and terminate to user via visual window.In this case, user only needs the motion observing roller just can understand crimping status of processes.Certainly, the label symbol of scale etc. and so on can also be set on the fixed part of such as housing, so that user more clearly observes the movement position of roller.It should be understood that and this vision can also be provided to indicate to user by other any suitable methods.

In the example shown in the series of figures, actuator arranges independent of hydraulic cylinder and is connected to hydraulic cylinder, it is to be understood, however, that actuator also can form with the piston rod of hydraulic cylinder.In addition, in the example shown in the series of figures, cylinder body 21 arranges independent of housing 80 and is connected to housing 80, it is to be understood, however, that cylinder body 21 can form with housing 80.

In the example shown in the series of figures, pumping unit 40 can comprise plunger displacement pump.Plunger displacement pump can be formed in cylinder body 21.Plunger displacement pump is communicated with fluid source 90 fluid, and is communicated with pressurised chamber 26 fluid of driver element 20.As shown in the figure, fluid source is oil groove or oil sac 90.Hydraulic oil pump in oil sac 90 is delivered in pressurised chamber 26 via fluid passage when its plunger reciprocates by plunger displacement pump.Preferably, check valve can be provided with, in case fluid is back to oil sac 90 from plunger displacement pump in the fluid passage being communicated with plunger displacement pump and oil sac 90.In addition, another check valve can be provided with, in case fluid is back to plunger displacement pump from pressurised chamber 26 in the fluid passage being communicated with plunger displacement pump and pressurised chamber 26.Check valve can the valve of any suitable form known in the art, is not described in detail at this.

Power unit 60 can be motor.When manual depression switch control unit 70, the rotor of motor 60 rotates, thus drives driving shaft to rotate.Via gear unit 50 by power transmission to the plunger of plunger displacement pump, make plunger reciprocates with pumps hydraulic oil.Gear unit 50 can be gear transmission unit.Preferably, gear unit 50 comprises the cam of the plunger reciprocates for actuation plunger pump.As shown in the figure, switch control unit 70 can be hand switch (such as, press button) form and to carry out manual operation on the shank facilitating hand to grip that can be arranged on housing 80.

Pressure release unit 30 can comprise hydraulic pressure releasing valve 32.Open when hydraulic pressure releasing valve 32 pressure be configured in pressurised chamber 26 reaches predetermined threshold and close after the moving part of driver element 20 returns preset distance.This predetermined threshold such as can be determined according to the crimping level expected.In other words, when being crimped to aspiration level to workpiece, the pressure increase in the chamber 26 of driver element 20 is to maximum, and this maximum corresponds to above-mentioned predetermined threshold.Like this, at the end of crimping, the pressure increase in chamber 26 is to predetermined threshold, and now, hydraulic pressure releasing valve 32 is opened.After hydraulic pressure releasing valve 32 is opened, chamber 26 is communicated with fluid source, the pressure drop therefore in chamber 26, that is, pressure release.

As shown in Figure 1, hydraulic pressure releasing valve 32 is communicated with pressurised chamber 26 fluid by the fluid passage 34 arranged in cylinder body 21.Hydraulic pressure releasing valve 32 can be arranged in oil sac 90, or is arranged in the space that is communicated with oil sac 90.Hydraulic pressure releasing valve 32 can comprise cylinder body, be arranged on cylinder body in and stretch out from one end of cylinder body with the valve plug 322 coordinated with fluid passage 34, the spring for applying restoring force to valve plug 322 be arranged in cylinder body.When hydraulic pressure releasing valve 32 cuts out, its valve plug 322 is under the action of the spring against the outlet of fluid passage 34.When the pressure in pressurised chamber 26 reaches predetermined threshold, valve plug 322 can be pushed away the outlet of fluid passage 34 by the pressure of pressure fluid, and the fluid in pressurised chamber 26 (hydraulic oil) is flowed in oil sac 90 via passage 34.When valve plug 322 is opened, pressurised chamber 26 is communicated with oil sac 90 fluid, thus reduces the pressure in pressurised chamber 26.After valve plug 322 is opened and when the pressure drop in pressurised chamber 26 is to the closing presure (or being called setting value) expected, valve plug 322 returns against and thus closes the outlet of fluid passage 34.Closing presure can regulate as required, and such as, spring by changing valve regulates.Preferably, this setting value can be greater than the force value in oil sac 90.In other words, when closing again after valve plug 322 is opened, the pressure in pressurised chamber 26 can be remained setting value but not initial value (such as, being roughly the force value in oil sac).In this case, the moving part of driver element 20 returns certain distance, but not is back to its initial position.

After hydraulic pressure releasing valve is opened, in order to enable user observe the motion of this rollback significantly, the moving part of driver element can be set greater than 3mm towards the preset distance of initial position return movement.

Above-mentioned functions according to the hydraulic pressure releasing valve 32 of pressure release unit 30 of the present utility model and the course of work can be realized by designing the size (size of the particularly outlet of fluid passage 34) of fluid passage 34, the size of spring of hydraulic pressure releasing valve 32 or the size of the spring of material and/or driver element or material, and/or determine the preset distance of return movement of moving part.It should be understood that and can also regulate this preset distance by the parameter setting miscellaneous part.

After completing all crimping processes and make pressurised chamber 26 pressure release by hydraulic pressure releasing valve 32, micro-leakage, consume etc. can make the pressure in pressurised chamber 26 reduce further lentamente.Like this, after long period section, the pressure in pressurised chamber 26 also can be reduced to initial pressure lentamente.

Preferably, pressure release unit 30 can also comprise manual relief valve 31.Manual relief valve 31 can be configured to when all crimping processes complete and/or in case of emergency can be manually opened to carry out thoroughly pressure release rapidly make the moving part of driver element 20 be reset to its initial position.

See Fig. 4 to Fig. 5, it illustrates according to manual relief valve 31 of the present utility model.Alternatively, manual relief valve 31 can be the form of check valve.As shown in the figure, manual relief valve 31 can comprise spool 317 that the valve guard 319 be fixedly installed in housing 80 and/or cylinder body 21 coordinates with valve guard 319, for activating the valve rod 315 of spool 317 and being arranged between valve rod 315 and valve guard 319 to provide the first elastic component 313 of restoring force for valve rod 315.In the example shown in the series of figures, spool 317 is roughly hemispherical, and the sphere of spool 317 can abut valve guard 319 to close manual relief valve 31.Preferably, valve guard 319 can be provided with the protuberance 3192 with the mating spherical surfaces of spool 317 within it.When sphere abuts protuberance 3192, manual relief valve 31 is in closed condition.When valve rod 315 promotes spool 317 away from protuberance 3192, manual relief valve 31 is opened to allow the fluid in pressurised chamber 26 flow through protuberance 3192 via fluid passage 312 and flow in oil groove or oil sac via fluid passage 316.Preferably, seal can be set between valve rod 315 and housing 80, in case fluid leaks.The seal can be the form of O shape circle.

Manual relief valve 31 can be communicated with pressurised chamber 26 fluid via fluid passage 312.In addition, control stick 311 is fixedly attached to housing 80 make control stick 311 that valve rod 315 can be made when being manually depressed to move thus spool 317 pushed away valve guard 319 to open manual relief valve 31.When not depressing control stick 311, the pressure fluid in fluid passage 312 applies protuberance 3192 that pressure makes it abut valve guard 319 to close manual relief valve 31 to spool 317.In the example shown in the series of figures, control stick 311 is pivotally connected to housing 80 by pin.It is to be understood, however, that control stick 311 can be connected to housing 80 in any suitable manner, as long as it can realize above-mentioned functions.

Alternatively, manual relief valve 31 can also comprise the second elastic component 314 applying power towards protuberance 3192 pairs of spools 317 of valve guard 319.Particularly, the second elastic component 314 be configured to bias voltage spool 317 make release control stick 311 after spool 317 can be made to move to close manual relief valve 31 towards protuberance 3192.

Be described in detail according to the operating process of crimping tool 1 of the present utility model referring to Fig. 1 to Fig. 6.

Under the original state of crimping tool 1, as shown in Figure 1, the crimping of two crimping components 11 and 13 of crimping unit 10 is opened away from each other and is waited to crimp workpiece to receive.And manual relief valve 31 and hydraulic pressure releasing valve 32 are all in closed condition.By after treating crimping workpiece putting into the space limited by electrolysis 111 and 131, depress switch 70 is with starter 60.Power transmission to the plunger of plunger displacement pump is made plunger reciprocates by the cam via gear unit 50, particularly gear unit 50, thus is pumped in the pressurised chamber 26 of driver element 20 via fluid passage by the hydraulic fluid in oil sac 90.Along with the increase of the fluid pressure in pressurised chamber 26, the moving part of driver element 20 is forced to move, thus against also promoting the drive surface 112,132 of crimping component 11,13, making the drive end 115,135 elastic deformation (as shown by the arrows in figure 2) of crimping component 11,13 and and then making crimping component 11,13 respectively around pin 12,14 pivotable.Now, the electrolysis 111 and 131 crimping component 11,13 is close to each other to crimp workpiece.

As shown in Figure 2, when applying maximum permission crimp force to workpiece, that is, when the pressure increase in pressurised chamber 26 to predetermined threshold (such as, 50Mpa shown in Fig. 6) time, the drive end 115,135 of crimping component 11,13 is in maximum distortion state substantially.Now, the pressure of the fluid in pressurised chamber 26 forces the valve plug 322 of hydraulic pressure releasing valve 32 to move away the outlet of fluid passage 34, and pressurised chamber 26 is communicated with oil sac 90 fluid.Therefore, the pressure in pressurised chamber 26 declines fast.Such as, as shown in Figure 6, the pressure drop in pressurised chamber 26 is to 2Mpa.

As shown in Figure 3, in the process of the pressure drop in pressurised chamber 26, the deformation energy release of the drive end 115,135 of crimping component 11,13, the restoring force F2 of the spring 27 in consequent deformation force F1 and hydraulic cylinder acts on and is greater than pressure fluid in pressurised chamber 26 making a concerted effort on piston 23 to piston 23 applied pressure F3, make drive end 115,135, the moving part of driver element 20 back moves.As the moving part displacement D1 of driver element 20, F1 ' and F2 ' act on that making a concerted effort on piston 23, the fluid be substantially equal in pressurised chamber 26 was applied to the pressure F3 ' on piston 23 time, namely, when the power of piston 23 both sides is in poised state, the moving part of driver element 20 stops mobile.By distance D1 be user conveyed once crimp process terminated vision instruction.Therefore, distance D1 is set as in the scope of user's visual perception.Such as, distance D1 can be moving part rollback to initial position distance 10 to percent nine ten.Owing to can provide for user the vision instruction once crimping process and terminated according to crimping tool of the present utility model, therefore user can release-push in time, with economize energy.In the example depicted in fig. 3, the moving part of driver element 20 is not also back to its initial position.

In above process, owing to make use of the deformation force F1 of drive end 115,135, the restoring force F2 of the spring 27 therefore in hydraulic cylinder does not need too large, can reduce the size of spring 27 thus, and therefore can reduce the size of hydraulic cylinder.

In addition, user is after the moving part perceiving driver element 20 has return distance D1---namely after learning that once crimping process has terminated---and release-push 70, motor 60 stops, and thus plunger displacement pump stops pumping fluid, and the pressure in pressurised chamber 26 declines further.Once release-push 70, valve plug 322 fast returns of hydraulic pressure releasing valve 32 also abut the outlet of fluid passage 34.When the valve plug 322 of hydraulic pressure releasing valve 32 closes fluid passage 34, the approximately 2Mpa of the pressure in pressurised chamber 26, is still greater than the pressure in oil sac 90.

Now, if need continuously the same pipe of crimping or another pipe, can direct depress switch 70, repeat crimping process.This time from initial crimping process difference, crimping process is that the pressure in pressurised chamber 26 is different.Because the pressure in pressurised chamber 26 is still greater than the pressure in oil sac 90, therefore, for follow-up crimping process, the rise time of the pressure in pressurised chamber 26 can shorten.Or, the motor of small volume can be adopted according to crimping tool of the present utility model, the cost of crimping tool can be reduced thus.

After all crimping processes complete, that is, crimping tool will not be re-used when workpiece is crimped, and can manually be depressed by control stick 311 and open manual relief valve 31, reduce further to make the pressure in pressurised chamber 26.Such as, when manual relief valve 31 is opened, the pressure in pressurised chamber 26 is reduced to the pressure roughly equal with the pressure in oil sac.By opening manual relief valve 31, the moving part of driver element 20 can be made to be back to its initial position.Or, in operating trouble or in emergency circumstances, also can manually open manual relief valve 31 by control stick 311, to make pressurised chamber 26 pressure release, thus the security of crimping tool can be guaranteed.

Owing to reducing the pressure in pressurised chamber 26 by hydraulic pressure releasing valve 32, therefore, again manually relief valve 31 pairs of pressurised chamber 26 further pressure release time, greatly can reduce to carry out manually operated power to relief valve 31, and/or the length of control stick 311 can be shortened.

As mentioned above, because the size of hydraulic cylinder less, plunger displacement pump can be integrated in cylinder body and can to adopt the motor of smaller size smaller, therefore, the structure of whole crimping tool of the present utility model can be compacter, weight is lighter, greatly facilitates hand-held thus.

It will be understood by those skilled in the art that the utility model is not limited to above-mentioned and illustrated concrete structure, but a lot of change can be made to it.Such as, the elastic component of such as spring mentioned above can be the elastic component of Compress Spring or other suitable forms.In addition, all components described here can be replaced by component equivalent in other technologies.Protection domain of the present utility model should be limited by appended claim.

Claims (18)

1. a hydraulic tool (1), it comprises:

Working cell (10), described working cell (10) are suitable for operating workpiece;

Driver element (20), described driver element (20) is configured to drive described working cell (10), and comprise cylinder body (21), to be arranged in described cylinder body (21) and can the moving part (23 of movement between initial position and operating position, 25), and for towards moving part (23 described in described initial position bias voltage, 25) elastic component (27), wherein, described cylinder body (21) and described moving part (23, 25) pressure fluid to be filled is defined with towards moving part (23 described in the bias voltage of described operating position, 25) chamber (26), and

Pressure release unit (30), described pressure release unit (30) comprises hydraulic pressure releasing valve (32), open to make described chamber (26) pressure release when described hydraulic pressure releasing valve (32) fluid pressure be configured in described chamber (26) reaches predetermined threshold

It is characterized in that, described hydraulic tool (1) is configured to after described hydraulic pressure releasing valve (32) is opened, allow described moving part (23,25) to move preset distance to provide vision to indicate to user towards described initial position, and described preset distance is less than the distance from described operating position to described initial position.

2. hydraulic tool (1) as claimed in claim 1, wherein, when described moving part (23,25) moves towards described initial position, described working cell (10) provide the elastic restoring force towards moving part (23,25) described in described initial position bias voltage together with described elastic component (27).

3. hydraulic tool (1) as claimed in claim 1, wherein, described pressure release unit (30) also comprises manual relief valve (31), described manual relief valve (31) is constructed to be permeable to manual unlocking with by described chamber (26) pressure release, makes described moving part (23,25) can be back to described initial position.

4. hydraulic tool (1) as claimed in claim 1, wherein, described hydraulic pressure releasing valve (32) is configured to allow described chamber (26) to be communicated with fluid source (90) via the fluid passage (34) be arranged in described cylinder body (21).

5. hydraulic tool (1) as claimed in claim 4, wherein, described fluid source (90) is arranged in the space limited by described cylinder body (21), and described hydraulic pressure releasing valve (32) is arranged in described fluid source (90).

6. hydraulic tool (1) as claimed in claim 3, wherein, the form that described manual relief valve (31) is check valve.

7. hydraulic tool (1) as claimed in claim 3, wherein, described manual relief valve (31) comprising: the valve guard (319) be fixedly installed, the spool (317) coordinated with described valve guard (319), for making the valve rod (315) of described spool (317) movement, and the first elastic component (313) for making described valve rod (315) reset, described spool (317) is configured to the anti-fluid when abutting described valve guard (319) and is allowed when moving away described valve guard (319) by described manual relief valve (31) fluid by described manual relief valve (31).

8. hydraulic tool (1) as claimed in claim 7, wherein, described spool (317) is in hemispherical, and the hemisphere face of described spool (317) coordinates with described valve guard (319).

9. hydraulic tool (1) as claimed in claim 7, wherein, described manual relief valve (31) also comprises for spool described in bias voltage (317) to abut second elastic component (314) of described valve guard (319).

10. hydraulic tool (1) as claimed in claim 3, wherein, described pressure release unit (30) also comprises the control stick (311) for manually opening described manual relief valve (31), and described control stick (311) is pivotally connected to the housing (80) of described hydraulic tool (1) by pin.

11. hydraulic tools (1) as claimed in claim 1, wherein, described hydraulic tool (1) also comprises the integrated pumping unit (40) be arranged in described cylinder body (21), and described pumping unit (40) is configured to the fluid pump in fluid source (90) to deliver in described chamber (26).

12. hydraulic tools (1) as claimed in claim 11, wherein, described pumping unit (40) comprises plunger displacement pump.

13. hydraulic tools (1) as claimed in claim 11, wherein, fluid is allowed to flow into the check valve of described pumping unit (40) from fluid source (90) being communicated with in described pumping unit (40) and the fluid passage of described fluid source (90) to be provided with.

14. hydraulic tools (1) as claimed in claim 11, wherein, fluid is allowed to flow into the check valve of described chamber (26) from described pumping unit (40) being communicated with in described pumping unit (40) and the fluid passage of described chamber (26) to be provided with.

15. hydraulic tools (1) according to any one of claim 1 to 14, wherein, determine described preset distance by least one in following item: the described elastic component (27) of described driver element (20), described hydraulic pressure releasing valve (32) is communicated with described chamber (26) fluid passage structure, for the valve plug of hydraulic pressure releasing valve (32) described in bias voltage and the elastic component of closes said fluid channel.

16. hydraulic tools (1) according to any one of claim 1 to 14, wherein, roller (22) is arranged on regularly with can working cell (10) described in Direct driver on described moving part (23,25), and described roller (22) is exposed to outside or indicates to provide described vision via visual window.

17. hydraulic tools (1) according to any one of claim 1 to 14, wherein, described preset distance is greater than 3mm.

18. hydraulic tools (1) according to any one of claim 1 to 14, wherein, described hydraulic tool (1) is crimping tool or cutting implement.