CN114738266A - Electric hydraulic tool - Google Patents

Abstract

The invention relates to the technical field of electric hydraulic tools, in particular to an electric hydraulic tool, which comprises: a drive means for providing power; an oil pump device including a pump body and an oil supply mechanism; and an actuator connected to the oil pump device; and the oil control device is arranged on the oil pump device, and the front end of the oil control device is arranged in the execution device. Wherein, oil supply mechanism include: the oil supply seat is internally provided with an oil inlet, an oil outlet channel I and a plunger cavity; at least two sets of plunger mechanisms mounted within the plunger cavity; the connecting piece is used for connecting the power shaft; an eccentric part is arranged on the power shaft; the rotation of the power shaft is converted into the reciprocating movement of the connecting piece in the set direction; and the two sides of the connecting piece in the set direction are respectively connected with the plunger mechanism. The invention has the advantages of stable operation, low failure rate, ensured use efficiency, long service life and the like.

Description

Electric hydraulic tool

Technical Field

The invention relates to the technical field of electric hydraulic tools, in particular to an electric hydraulic tool.

Background

Electro-hydraulic tools come in a wide variety of forms, such as punches, shears, crimpers, and the like. A complete hydraulic tool system consists of five parts, namely a power element, an actuator, a control element, an auxiliary element and hydraulic oil.

The conventional hydraulic tool, for example, chinese patent 201020529262.4, discloses a hand-held steel bar quick-cutting device, which mainly comprises a rechargeable battery, a dc motor, a speed-adjusting switch, a hydraulic cylinder, a piston rod, and a blade, wherein a high-pressure plunger pump, an overflow valve, and a check valve are disposed in the hydraulic cylinder, the blade is connected to the piston rod, the blade is made of alloy steel or high-speed steel, the dc motor is powered by the rechargeable battery, the dc motor is connected to the hydraulic cylinder through a coupling, the dc motor drives the high-pressure plunger pump in the hydraulic cylinder when rotating, generates a hydraulic fluid with a high pressure up to 63MPa, drives the piston rod to move forward, and the piston rod cuts off a cut object when driving the blade to move forward.

However, the prior art has the following problems

1. The design of current piston assembly utilizes the design of plunger cap and spring, and long-time back of using can have the spring to break or the spring inefficacy, leads to the whole unable work of machine or be inefficient, and hydraulic effect is poor for example, even produces the piece after the spring breaks, enters into the oil duct, causes the condition of jam.

2. When using, because metal itself can have certain elasticity, can retract, take place easily that the mould is blocked by the centre gripping, lead to equipment can not reset, influence the normal use of equipment, influence the problem of efficiency.

3. The relative fixed angle of the handle and the grip of the equipment is invariable, and the adjustment can not be carried out according to the use scene or the use habit, so the use is inconvenient.

Disclosure of Invention

The invention aims to provide an electric hydraulic tool which is convenient to use and compact in structure.

The purpose of the invention is realized as follows:

an electro-hydraulic tool comprising:

a drive means for providing power;

an oil pump device including a pump body and an oil supply mechanism; and

the actuating device is connected with the oil pump device; and

and the oil control device is arranged on the oil pump device, and the front end of the oil control device is arranged in the execution device.

Wherein, oil supply mechanism include:

the oil supply seat is internally provided with an oil inlet, an oil outlet channel I and a plunger cavity;

at least two sets of plunger mechanisms mounted within the plunger cavity; and

the connecting piece is used for connecting the power shaft;

an eccentric part is arranged on the power shaft; the rotation of the power shaft is converted into the reciprocating movement of the connecting piece in the set direction;

and the two sides of the connecting piece in the set direction are respectively connected with the plunger mechanism.

Preferably, the plunger mechanism has at least:

the rear end part of the plunger rod is connected to the connecting piece, and the front end part of the plunger rod is inserted into the corresponding plunger cavity;

the rotation of the eccentric shaft drives the end parts of at least two plunger rods to alternately reciprocate in the plunger cavity.

Preferably, the connecting piece is an annular piece, the rear end part of the plunger rod is connected to the annular piece, and the end part of the eccentric shaft is arranged in the annular piece and movably abutted against the rear end part of the plunger rod or the inner wall of the annular piece.

Preferably, the end face of the oil supply seat is formed with a first limiting part, and the side wall of the ring-shaped part moves along the side wall of the first limiting part to limit the position of the ring-shaped part so that the ring-shaped part moves along the axial direction of the plunger rod.

Preferably, a first gasket is sleeved on the eccentric shaft and abuts against the end face of the connecting piece;

the end part of the first limiting part is formed with a first clamping groove, and the position of the first gasket is restrained by clamping the first clamping groove through the clamping piece, so that the position of the connecting piece is restrained.

Preferably, the oil control device has at least:

the rear end of the oil control valve core is arranged in an oil control column in the middle of the pump body, and an oil control channel capable of communicating the hydraulic cavity and the oil chamber is arranged in the oil control valve core;

the oil control limit plate is arranged at the end part of the piston of the actuating device;

the end part of the oil control valve core is formed with an oil control plug used for abutting against the front end of the sealed oil control column;

when the piston of the executing device moves to a set position, the oil control limiting plate pushes the oil control valve core, so that the oil control channel is conducted;

when the piston of the executing device retracts to the second set position, the oil control valve core is pushed forcibly to close the oil control channel.

Preferably, the oil control plug is sleeved with a first buffer spring in an outer manner, the middle of the oil control limiting plate is provided with an oil control hole, the front end of the oil control column penetrates through the oil control hole and is arranged in the piston, and the end part of the first buffer spring movably abuts against the oil control limiting plate.

And a second buffer spring is sleeved on the oil control valve core, and the end part of the second buffer spring is respectively abutted against the oil control column and the oil control plug and is used for supporting the buffer oil control valve core.

Preferably, a hydraulic cavity is formed in the executing device, the piston is arranged in the hydraulic cavity, and the hydraulic cavity is divided into a hydraulic extending cavity and a hydraulic retracting cavity;

an oil inlet channel is formed in the pump body and comprises an oil inlet flow channel I and an oil inlet flow channel III communicated with the hydraulic stretching cavity;

a reset oil duct is formed in the pump body and communicated with the hydraulic retraction cavity;

an oil passing part is formed on the outer wall of the lower end of the oil control valve core;

and when the oil control valve core moves axially, the first oil inlet flow passage is switched to be communicated with the third oil inlet flow passage or the reset oil passage.

Preferably, the oil inlet flow passage I, the oil inlet flow passage III and the reset oil passage are distributed in the pump body along the moving direction of the oil control valve core.

Preferably, at least two oil passing parts are formed on the outer wall of the lower end of the oil control valve core, and a second limiting part is further arranged at the lower end of the oil control valve core;

when the second limiting part abuts against the lower end face of the pump body, the first oil inlet flow passage and the reset oil duct are communicated through the oil passing part.

Compared with the prior art, the invention has the outstanding and beneficial technical effects that:

1. the scheme that utilizes the spring to reset among the prior art is got rid of in this application scheme, adopts the connecting piece to drive plunger mechanism reciprocating motion, realizes the action of oil feed and reseing. This scheme of adoption can guarantee the stability that plunger mechanism removed, does not have the condition that the spring breaks or the spring became invalid among the prior art, can guarantee the stability of plunger mechanism operation, guarantees the normal of fuel feeding, can provide higher hydraulic pressure simultaneously, can reduce clastic production moreover, reduces the condition that the oil circuit blockked up and fish tail plunger chamber appears, guarantees life.

2. The first limiting part is mainly used for restricting the moving position of the connecting piece, ensuring the accuracy of the moving direction of the connecting piece and further ensuring the working stability of the plunger mechanism and the plunger effect.

3. According to the invention, the first clamping groove is formed at the end part of the first limiting part, and the clamping piece is clamped in the first clamping groove to restrain the position of the first gasket, so that the position of the connecting piece is restrained, the connecting piece is prevented from moving in the axis direction of the eccentric shaft, the axial shake is reduced, and the stability and the precision of the device are ensured.

4. The oil control device disclosed by the invention has the advantages that the automatic oil return of the equipment can be realized through the design, the automatic retraction of the piston can be realized without manual operation, the use is simpler, and the use efficiency is improved.

5. On the one hand, in the pressure relief process, the buffer spring can support the oil control plug due to continuous reduction of oil pressure, so that the oil control channel is prevented from being closed when the pressure relief is not completed, and the smooth completion of the pressure relief is ensured; on the other hand can cushion the upper end that accuse oil end cap butt accuse oil post, avoids taking place rapid collision, leads to the sealed not tight of accuse oil end cap and accuse oil post tip, solves the hydraulic pressure intracavity oil pressure unstability, influences the problem of hydraulic pressure effect.

6. The active reset structure can realize active reset of the piston, effectively avoid the situation of clamping, ensure normal use of equipment and ensure use efficiency.

7. The reversing device can automatically adjust the included angle between the handle and the grip according to the use habit or use scene of a user, and is convenient to use.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is an overall sectional view of the present invention.

Fig. 3 is a schematic structural view of the oil supply mechanism and the plunger mechanism of the present invention.

Fig. 4 is a top structural schematic view of the oil supply mechanism and the plunger mechanism of the present invention.

Fig. 5 is an exploded view of the oil supply mechanism and the plunger mechanism of the present invention.

FIG. 6 is a cross-sectional view of the actuator of the present invention in a retracted state.

Fig. 7 is a state diagram of the piston of the present invention when it is extended to a set position.

Fig. 8 is a state diagram of the piston of the present invention pushing the oil control valve core to move and opening the oil control passage.

Fig. 9 is a second partial sectional view of the present invention.

Fig. 10 is an enlarged view of the area a of fig. 9.

Fig. 11 is a bottom structure diagram of the present invention.

Fig. 12 is a sectional view taken along the line a-a in fig. 11.

Fig. 13 is an exploded view of an oil control device of the present invention.

FIG. 14 is a schematic end view of the pump body of the present invention.

Fig. 15 is a sectional view taken along the direction C-C of fig. 14.

Fig. 16 is an exploded view of the reversing device of the present invention.

Fig. 17 is an enlarged view of the area D of fig. 2 according to the present invention.

Fig. 18 is a cross-sectional view of the reversing device of the present invention.

Reference numerals:

100. a drive device; 101. an eccentric shaft; 102. a motor; 103. a battery; 104. a speed reducer;

200. an oil pump device; 201. a pump body; 202. an oil chamber; 203. an oil inlet channel; 204. an oil supply mechanism; 205. a plunger cavity; 206. A plunger mechanism; 207. a connecting member; 208. a plunger rod; 209. a first limiting part; 210. a first gasket; 211. a first clamping groove; 212. A clamping piece; 213. a second gasket; 214. a first oil inlet flow passage; 215. an oil inlet flow passage III; 216. resetting the oil duct; 217. a pressure stabilizing oil way; 218. a one-way valve I; 219. an oil supply seat; 220. a plunger boss; 221. a second one-way valve; 222. a one-way valve III; 223. A needle bearing;

300. an execution device; 301. a mold base; 302. a piston; 303. a hydraulic chamber; 304. a hydraulic spring; 305. a hydraulic extension cavity; 306. a hydraulic retraction cavity;

400. an oil control device; 401. an oil control valve core; 402. controlling an oil column; 403. an oil control channel; 404. an oil control limit plate; 405. an oil control plug; 406. a first buffer spring; 407. an oil control hole; 408. a second buffer spring; 409. an oil passing part; 410. a second limiting part;

500. a reversing device; 501. a grip; 502. a handle; 503. a connecting cover; 504. a motor flange plate; 505. a positioning mechanism; 506. positioning a groove; 507. a positioning member; 508. a positioning spring; 509. positioning holes; 510. a restraint mechanism; 511. a strip-shaped mounting groove; 512. an arc-shaped elastic sheet; 513. an arc-shaped boss; 514. a connecting flange; 515. a limiting edge; 516. a clearance for movement; 517. a convex ring.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

As shown in fig. 1 and 2, an electro-hydraulic tool includes: the hydraulic mold comprises a driving device 100 for providing power, an oil pump device 200 for providing hydraulic oil, an actuating device 300 for driving a mold to move, and an oil control device 400 for controlling the flow of the hydraulic oil, wherein the oil pump device 200 comprises a pump body 201, an oil supply mechanism 204 and a plunger mechanism 206.

The output end of the driving device 100 is connected with the oil pump device 200, the end of the oil pump device 200 is connected with the execution device 300, the oil control device 400 is installed in the execution device 300, a mold is installed on the execution device 300, and the mold is driven by the execution device 300 to move, so that the corresponding functional function is realized.

The kind of the die may be a crimping pliers die or a scissors die for shearing metal or a punching die of a punching machine, or the like.

The preliminary work flow is that the driving device 100 works to drive the oil pump device 200 to work, so that the hydraulic oil flows into the execution device 300, thereby driving the moving of the moving mold on the execution device 300, and matching with the fixed mold to realize the corresponding work.

The driving device 100 mainly includes: the motor 102, the battery 103 and the reducer 104, wherein the output end of the reducer 104 is connected with an eccentric shaft 101, and the motor 102 works by the power provided by the battery 103 to realize the power output of the eccentric shaft 101 of the reducer 104.

As shown in fig. 3 to 5, the oil pump apparatus 200 mainly includes: the oil supply mechanism 204 comprises a connecting piece 207 and at least two groups of plunger mechanisms 206;

an oil chamber 202 is formed in the pump body 201, the oil supply mechanism 204 is installed in the oil chamber 202, and hydraulic oil is mainly stored in the oil chamber 202.

An oil inlet channel 203 communicated with the execution device 300 is formed in the pump body 201, a plunger cavity 205 is formed in the oil supply mechanism 204, and the plunger cavity 205 is communicated with the oil chamber 202 and communicated with the oil inlet channel 203, so that hydraulic oil can enter the hydraulic cavity 303 of the execution device 300 from the oil chamber 202.

The plunger mechanisms 206 are arranged in the oil supply mechanism 204, when the two sets of plunger mechanisms are arranged, the plunger mechanisms are symmetrically arranged, when the three sets of plunger mechanisms are arranged, the axial distribution of equal included angles is realized, after the installation is finished, the rear end of the plunger mechanism 206 is connected with the connecting piece 207, the end part of the eccentric shaft 101 is arranged in the middle of the two sets or three sets or more sets of plunger mechanisms 206, namely, in the connecting piece 207, the connecting piece 207 is driven to reciprocate in a set direction through the rotation of the eccentric shaft 101, so that the plunger mechanisms 206 are driven to alternately reciprocate, the flow of hydraulic oil is realized, hydraulic pressure is generated, and the work is realized.

When the plunger mechanism 206 is 2 sets, the plunger mechanisms 206 are distributed on opposite sides of the connecting member 207, and the setting direction refers to the axial direction of 2 plunger chambers 205.

When the plunger mechanisms 206 are 3 or four groups, the plunger mechanisms 206 are circumferentially distributed around the connecting member 207, and the rotation locus of the eccentric shaft of the direction finger is set, i.e., the circular direction.

The existing piston 302 assembly is designed by utilizing a plunger cap and a spring, the eccentric shaft 101 overcomes the elasticity of the spring to push the plunger cap to move, and the spring is reset, so that oil generates hydraulic pressure, the piston 302 column moves, and the upper die is driven.

However, after long-time use, the spring is broken or the spring fails due to temperature rise, so that the whole machine cannot work or the efficiency is low, and the like, for example, the hydraulic effect is poor, and even chips are generated after the spring is broken and enter the oil passage to cause blockage.

In order to solve the above problem, the plunger mechanism 206 and the oil supply mechanism 204 are modified in the present embodiment as follows.

As shown in fig. 5, the oil supply mechanism 204 includes an oil supply base 219, a plurality of plunger bosses 220 are formed on a lower end surface of the oil supply base 219 in a protruding manner, in this embodiment, two plunger bosses 220 are provided and symmetrically provided, a plunger cavity 205 is horizontally formed in the plunger bosses 220, an oil inlet is formed on a side surface of the plunger bosses 220, the oil inlet communicates with the oil chamber 202 and the plunger cavity 205, an oil outlet channel i is formed on the plunger bosses 220, the oil outlet channel i penetrates through an end surface of the oil supply base 219, and the oil outlet channel i communicates with the plunger cavity 205 and the oil inlet channel 203.

When the upper end face of the oil supply seat 219 abuts against the lower end of the pump body 201, the oil outlet passage is connected to the oil inlet passage 203.

Meanwhile, a second check valve 221 is installed at a part, connected with the oil inlet channel 203, of the oil outlet channel, and a third check valve 222 is installed at the oil inlet.

The plunger mechanism 206 comprises a plunger rod 208;

the connecting piece 207 is arranged between the plunger bosses 220, the front end of the plunger rod 208 is inserted into the corresponding plunger cavity 205, the rear end of the plunger rod 208 is connected with the connecting piece 207, and the connecting piece 207 is connected with the eccentric shaft 101.

The rotation of the eccentric shaft 101 drives the plunger rod 208 to move alternately and reciprocally, so that the end of the plunger rod moves in the plunger cavity 205, and the one-way valve two 221 and the one-way valve three 222 are matched to drive the hydraulic oil to flow for oil supply.

In the scheme of the application, the scheme of spring reset in the prior art is eliminated, and the connecting piece 207 is adopted to drive the plunger rod 208 to move back and forth, so that the oil inlet and reset actions are realized. By adopting the scheme, the moving stability of the plunger rod 208 can be ensured, the situation that the spring is broken or the spring fails in the prior art does not exist, the running stability of the plunger mechanism 206 can be ensured, the normal oil supply is ensured, higher hydraulic pressure can be provided, the generation of fragments can be reduced, the situations that an oil way is blocked and the plunger cavity 205 is scratched are reduced, and the service life is ensured.

The specific connecting member 207 may be a ring member having a contour close to a square shape and an arc-shaped smooth transition at a corner.

The rear end of the plunger rod 208 is folded outwards to form a folded edge, the front end of the plunger rod passes through the annular piece, and the folded edge of the rear end of the plunger rod abuts against the inner wall of the annular piece to realize the connection of the plunger rod 208 and the connecting piece 207; the two ends of the eccentric shaft 101 are fixed through bearings, so that the eccentric part is located between the annular parts, meanwhile, a needle bearing 223 is sleeved on the eccentric part, the eccentric shaft 101 drives the needle bearing 223 to move in the annular parts, in the moving process, at least one plunger rod 208 is pressed to enter the plunger cavity 205 to drive hydraulic oil, other corresponding plunger rods 208 in the plunger cavity 205 are pulled out, and the reciprocating movement is carried out in an alternating mode so as to realize the formation of hydraulic pressure.

The connecting piece 207 is used for replacing the existing spring, and the operation stability and efficiency of the whole mechanism are ensured.

The needle bearing 223 can reduce wear and ensure hydraulic effect.

As shown in fig. 5, in order to ensure that the connecting member 207 always moves in the axial direction of the plunger cavity 205, a first limiting portion 209 is formed on each of two sides between the plunger bosses 220, the sidewall of the connecting member 207 movably abuts against the inner sidewall of the first limiting portion 209, and the first limiting portion 209 is mainly used for restricting the moving position of the connecting member 207, ensuring the accuracy of the moving direction of the connecting member 207, and further ensuring the working stability and the plunger effect of the plunger mechanism 206.

The first limiting portion 209 may be in the form of a boss, or a groove formed on the oil supply seat, so long as the movement position of the connecting member 207 can be restricted.

Meanwhile, a first gasket 210 and a second gasket 213 are sleeved on the eccentric shaft 101, the first gasket 210 and the second gasket 213 are respectively arranged at two ends of the connecting piece 207, and the second gasket 213 is arranged on the end face of the oil supply seat 219 to fix a bearing for fixing the end part of the eccentric shaft 101 on one hand and isolate the contact between the needle roller bearing 223 and the connecting piece 207 and the oil supply seat 219 on the other hand, so that the abrasion on the oil supply seat 219 is reduced, and the service life and the use stability are ensured.

The end of the first limiting portion 209 is provided with a first clamping groove 211, and the first gasket 210 is constrained by clamping the first clamping groove 211 through a clamping piece 212, so that the position of the connecting piece 207 is constrained, the connecting piece 207 is prevented from moving in the axial direction of the eccentric shaft 101, axial shaking is reduced, and the stability and precision of the device are ensured.

The snap spring used in the embodiment of the snap member 212 may also be a pin.

The oil supply seat 219 is also provided with a magnet which is mainly used for attracting metal impurities in hydraulic oil and avoiding the situations of blocking and scratching an oil way.

The outer wall of needle bearings 223 may also abut the inner wall of the ring, so that the end of plunger rod 208 does not protrude beyond the inner wall of the ring.

Meanwhile, the long side L of the ring-shaped element is larger than the short side S, and the design is to ensure that the eccentric shaft 101 can only drive the ring-shaped element to move along the axis of the plunger cavity 205, and the ring-shaped element cannot move in other directions.

[ modification 1 ]

The above-mentioned connecting element 207 can also be a connecting rod design, the end of the connecting rod is connected to the outer ring of the needle bearing 223, and the other end is connected with the plunger rod 208, so that the rotation of the eccentric shaft 101 can also realize the alternate movement of the plunger rod 208.

As shown in fig. 2 and 6, the execution apparatus 300 mainly includes: a die holder 301, a piston 302, and a hydraulic spring 304;

the end part of the die holder 301 is connected with the end surface of the pump body 201 so as to form a hydraulic cavity 303, and the piston 302 and the hydraulic spring 304 are both arranged in the hydraulic cavity 303; the front end of the piston 302 penetrates out of the die holder 301 for installing the movable die, the end of the hydraulic spring 304 is respectively abutted against the piston 302 and the die holder 301 for enabling the piston 302 to have a tendency to approach the pump body 201, meanwhile, the piston 302 divides the hydraulic cavity 303 into a hydraulic extending cavity 305 and a hydraulic retracting cavity 306, and the hydraulic spring 304 is arranged in the hydraulic retracting cavity 306.

The oil inlet passage 203 mentioned above is mainly communicated with the hydraulic protrusion chamber 305.

A passage for oil return may be provided in the mold base 301 and the pump body 201 to achieve oil return and ensure the resetting of the piston 302.

The adopted mode can be the design of the existing manual oil return, and the description about the structure of the manual oil return is not expanded, belonging to the prior art.

However, the manual oil return is troublesome to use, and in order to make the use more convenient, the oil control device 400 capable of automatically returning oil is also designed in the scheme, and the specific scheme of the oil control device 400 is as follows, and reference can be made to fig. 6 to 8.

The oil control device 400 includes: the oil control valve core 401, the oil control limit plate 404, the first buffer spring 406 and the second buffer spring 408;

an oil control column 402 is convexly formed or installed in the middle of the upper end face of the pump body 201, the interior of the oil control column 402 is hollow and is communicated with the upper end face and the lower end face, the lower end of the oil control column 402 is communicated with an oil chamber, and the inner diameter part of the interior of the upper end of the oil control column 402 is slightly larger than other parts;

the lower end of the piston 302 is recessed into a forming cavity for accommodating the oil control column 402, the rear end of the oil control valve core 401 is arranged in the oil control column 402, an oil control plug 405 is formed at the front end of the oil control valve core 401, an oil control channel 403 is formed in the oil control valve core 401, and openings at two ends of the oil control channel 403 are respectively located at the lower end of the oil control valve core 401 and the side wall of the oil control valve core 401.

An oil control limit plate 404 is arranged at the lower end of the piston 302, an oil control hole 407 is formed in the middle of the oil control limit plate 404, and the diameter of the oil control hole 407 is smaller than the outer diameter of the oil control plug 405, so that the oil control plug 405 can be blocked.

An oil passing hole is formed in the oil supply seat 219, so that the oil control passage 403 is communicated with the oil chamber 202.

Oil pump unit begins work, and when hydraulic oil began to promote piston 302 and stretches out, because the continuous increase of oil pressure, when oil control end cap 405 did not receive extra exogenic action down, the oil pressure can continue to be used in oil control end cap 405, makes oil control end cap 405 can seal the tip of oil control post 402 to realize the normal extension of piston, realize the effect of pneumatic cylinder.

In the process that the piston 302 extends, the oil control valve core 401 does not move, at this time, the hydraulic retraction cavity 306 is communicated with the oil chamber 202 through the return oil passage 216, the hydraulic retraction cavity 306 gradually decreases, and hydraulic oil in the hydraulic retraction cavity 306 can flow back into the oil chamber through the return oil passage 216, so that the piston 302 can extend smoothly.

As shown in fig. 7 and 8, when the piston 302 of the actuator 300 moves to a set position, the oil control limit plate 404 pushes the oil control valve element 401, so that the oil control passage 403 is opened.

The first setting position means that when the actuator 300 is in the critical position of the extended state, that is, when the piston 302 is about to move to the maximum extended state, the oil control limit plate 404 contacts with the oil control plug 405, so that the oil control valve element 401 is displaced, and the end of the oil control valve element 401 is separated from the front end of the oil control column, at this time, the high-pressure hydraulic oil extending out of the hydraulic extended cavity 305 flows back to the oil chamber 202 along the oil control channel 403, so as to implement pressure relief, and the hydraulic spring 304 presses the piston 302 back to the initial position.

As shown in fig. 6, when the piston 302 of the actuator 300 retracts to the second setting position, the oil control valve core 401 is forced to close the oil control passage 403.

The second setting position refers to when the piston 302 retracts to the initial state, that is, when the actuator 300 is in the retracted state, at this time, no hydraulic oil is provided into the hydraulic extension cavity 305, under the action of the hydraulic spring 304, the piston 302 presses against the oil control plug 405 to force the oil control plug 405 to move, so that the end surface of the oil control plug 405 abuts against the end surface of the oil control column 402, thereby sealing the oil control channel 403 to close the oil control channel 403, and at this time, the hydraulic oil extending out of the cavity 305 cannot flow back to the oil chamber 202 through the oil control channel 403.

When used again, the above process is repeated and the work is performed.

The first buffer spring 406 is sleeved outside the oil control plug 405, the front end of the oil control column penetrates through the oil control hole 407 and is arranged in the piston 302, and the end part of the first buffer spring 406 is movably abutted against the oil control limit plate 404.

The function of the first buffer spring 406 is mainly to perform a buffering function, that is, after the piston 302 extends to a certain extent, the oil control limit plate 404 starts to abut against the first buffer spring 406, and then moves with the piston 302. After the first buffer spring 406 is compressed to a certain degree, the oil control plug 405 is pushed to move against the pressure of the oil pressure on the oil control plug 405, so that the oil control channel 403 is communicated.

The first buffer spring 406 realizes flexible pressure application of the oil control limit plate 404 and the oil control plug 405, so that the conditions of collision and deformation and the like are avoided, the noise is reduced, and the service life is prolonged.

A second buffer spring 408 is installed in the upper end of the oil control column 402, and the end of the second buffer spring 408 abuts against the oil control column 402 and the oil control plug 405 respectively.

On one hand, the second buffer spring 408 can support the oil control plug 405 due to continuous reduction of oil pressure in the pressure relief process, so that the oil control channel 403 is prevented from being closed when the pressure relief is not completed, and the smooth completion of the pressure relief is ensured; on the other hand can cushion the upper end that accuse oil end cap 405 butt accuse oil post 402, avoids taking place rapid collision, leads to the sealed not tight of accuse oil end cap 405 and accuse oil post 402 tip, leads to the interior oil pressure unstability of hydraulic pressure chamber 303, influences the problem of hydraulic pressure effect.

The process of automatic pressure release oil return can be understood in the above-mentioned process, and when the use scene that combines other equipment, for example the use of punching tool, when punching a hole, because metal itself can have certain elasticity, can retract, the back of punching a hole, probably has to clip the cut-out press, leads to the machine can not reset, influences the normal use of equipment, influences the problem of efficiency.

In order to solve the above problems, a structure capable of active reset is designed, which is as follows.

As shown in fig. 9-15, the oil inlet channel 203 includes an oil inlet channel one 214 and an oil inlet channel three 215 communicated with the hydraulic extension cavity 305, meanwhile, a reset oil channel 216 is formed in the pump body 201, the reset oil channel 216 is communicated with the hydraulic retraction cavity 306, and an oil passing portion 409 is formed on the outer wall of the lower end of the oil control valve core 401; when the oil control valve core 401 moves axially, the oil inlet flow passage one 214 can be switched to be communicated with the oil inlet flow passage three 215 or the reset oil passage 216.

That is, when the piston is in the second setting position, no hydraulic oil is provided to the hydraulic extension cavity 305, that is, when the piston 302 is in the retracted state, the oil passing portion 409 is communicated with the first oil inlet flow passage 214 and the third oil inlet flow passage 215, at this time, the hydraulic oil in the oil chamber 202 can be supplied to the hydraulic extension cavity 305 under the action of the oil pump, and the hydraulic oil in the hydraulic retraction cavity 306 can flow back to the oil chamber through the return oil passage 216, so that the extension of the piston 302 is realized.

When the piston is at a first set position and is at a critical position of an extending state, namely when the piston 302 is about to move to a maximum extending state, the oil control limit plate 404 is in contact with the oil control plug 405 to enable the oil control valve core 401 to displace, at the moment, the oil inlet flow passage one 214 and the reset oil passage 216 are conducted by the oil passing part 409 to cut off the communication between the reset oil passage 216 and the oil chamber, namely, hydraulic oil in the hydraulic extending cavity 305 flows back to the oil chamber 202 through the oil control passage 403, and simultaneously, due to the switching of the oil passages, an oil supply path of the oil pump is changed to supply oil to the hydraulic retracting cavity 306, so that the piston 302 returns to an initial position under the action of the hydraulic spring 304 and the oil pressure of reverse oil supply, and the active reset effect is realized, and even if a punching die is clamped, the piston 302 can also reset under the action of reverse oil supply to avoid clamping, and ensure the normal use of the equipment.

The oil outlet passage is communicated with the first oil inlet flow passage 214.

At least two oil passing parts 409 are formed on the outer wall of the lower end of the oil control valve core 401, the oil passing parts 409 are distributed along the axial direction of the oil control valve core 401, and a second limiting part 410 is further arranged at the lower end of the oil control valve core 401; the second limiting portion 410 may be a snap spring or a pin.

In operation, when oil is supplied to the hydraulic extension cavity 305, one of the oil passing portions 409 conducts the first oil inlet flow passage 214 and the third oil inlet flow passage 215, and the other does not work;

after the displacement of the oil control valve core 401 occurs until the second limiting portion 410 abuts against the lower end face of the pump body 201, one of the oil passing portions 409 conducts the first oil inlet flow passage 214 and the reset oil passage 216, and the other oil passing portion 409 blocks the third oil inlet flow passage 215.

The second limiting portion 410 is mainly used for ensuring the accuracy of the moving position of the oil control valve core 401, so that the oil passing portion 409 can be ensured to be accurately communicated with the first oil inlet flow passage 214 and the reset oil passage 216, the other oil passing portion 409 is used for blocking the third oil inlet flow passage 215, the smooth operation of the reset action is ensured, and the use stability is ensured.

An oil chamber II is formed in the die base 301 and communicated with the oil chamber II, and the oil chamber II is mainly used for compensating hydraulic oil which is lacked by leakage or loss of the oil chamber.

The oil chamber can be formed in the pump body, and can also be additionally connected with an external oil chamber.

In order to ensure the balanced flow of the hydraulic oil in the hydraulic extension cavity 305 and the hydraulic retraction cavity 306 during the oil supply or pressure relief process, a pressure stabilizing oil path 217 is formed in the oil supply seat 219, the pressure stabilizing oil path 217 conducts the oil chamber 202 and the reset oil path 216, and a one-way valve 218 is arranged at the joint of the pressure stabilizing oil path 217 and the reset oil path 216 and used for controlling the hydraulic retraction cavity 306 of the hydraulic oil to flow back to the oil chamber 202.

On the basis of automatic oil return, a manual oil return device can be further installed, the manual oil return device is designed in the prior art, description is not needed, the manual oil return device can perform pressure relief at any time, and the use scene is more free.

In the actual use process, the relative fixed angle between the grip 501 of the existing equipment and the handle 502 of the driving device 100 is not changed, and the existing equipment cannot be adjusted according to the use scene or the use habit, so that the existing equipment is inconvenient to use. The scheme also describes a reversing device 500 which is arranged between the driving device 100 and the oil pump device 200, and the specific structure is as follows.

The grip 501 is mounted on the die holder 301, and the handle 502 is mounted on the driving device 100.

As shown in fig. 14-16, the reversing device 500 includes a connecting cover 503, a flange of the motor 102, and a positioning mechanism 505;

the connecting cover 503 is connected to the end of the oil pump device 200, the flange of the motor 102 is connected to the end of the reducer 104, the connecting cover 503 and the flange of the motor 102 are rotatably connected, the positioning mechanism 505 is installed between the connecting cover 503 and the flange of the motor 102, and a positioning groove 506 matched with the positioning mechanism 505 is formed in the flange of the motor 102.

The positioning mechanism 505 includes a positioning element 507 and a positioning spring 508, a positioning hole 509 is formed on the connecting cover 503, the positioning spring 508 and the positioning element 507 are both installed in the positioning hole 509, the positioning element 507 is located at an end portion of the positioning spring 508, the positioning spring 508 enables the positioning element 507 to have a tendency of protruding out of the positioning hole 509, and a part of the positioning element 507 protruding out of the positioning hole 509 is matched with the positioning groove 506 to realize positioning.

In this design, can 360 degrees rotations between connection cover 503 and the motor 102 ring flange, constant head tank 506 circumference is provided with four, and the interval contained angle is 90 degrees between the adjacent constant head tank 506, also can set up the constant head tank 506 of other numbers, and the angle can be selected according to actual conditions by oneself.

Therefore, the included angle between the grip 501 and the handle 502 can be automatically adjusted according to the use habits or use scenes of the user, and the use is convenient.

The number of the positioning mechanisms 505 may not be the same as that of the positioning grooves 506, and in order to restrain the force required by the rotation angle, that is, the included angle between the slight twisting and the use safety may not occur, a restraining mechanism 510 is further disposed between the connecting cover 503 and the flange of the motor 102, and the restraining mechanism 510 is used to increase the force required by the rotation and ensure the use safety.

The constraint mechanism 510 includes a bar-shaped mounting slot 511 and an arc-shaped elastic piece 512 formed on the end surface of the connection cover 503, wherein the arc-shaped elastic piece 512 is disposed in the bar-shaped mounting slot 511 and partially protrudes out of the end surface of the connection cover 503.

When the connecting cover 503 is connected to the flange of the motor 102, the protruding portion of the arc-shaped spring 512 is disposed in the positioning slot 506, and the deformation elastic force of the arc-shaped spring 512 is greater than the force of the positioning spring 508.

An arc-shaped boss 513 is formed on the end face of the flange plate of the motor 102, and the outer wall of the arc-shaped boss 513 is movably abutted to the inner side wall of the connecting cover 503 to play a role in positioning, so that the installation and positioning are ensured on the one hand; another aspect is to ensure that the rotation is smooth.

The rotational connection between the connection cover 503 and the flange of the motor 102 is as follows.

A connecting flange 514 is connected to the end face of the motor 102 flange plate through bolts, a limiting edge 515 is formed on the outer side wall of the connecting flange 514, and a movable gap 516 is formed between the limiting edge 515 and the motor 102 flange plate; the inner side wall of the connection cover 503 is formed with a convex ring 517.

The convex ring 517 is placed in the movable gap 516, and then the flange plate of the motor 102 is connected with the connecting flange 514, so that the convex ring 517 can be restricted in the movable gap 516, and the convex ring 517 can only rotate in the movable gap 516 and can not axially displace, thereby realizing connection.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. An electro-hydraulic tool, comprising:

a drive device (100) for providing power;

an oil pump device (200), the oil pump device (200) including a pump body (201) and an oil supply mechanism; and

an actuator (300) connected to the oil pump device (200); and

and the oil control device (400) is installed on the oil pump device (200), and the front end of the oil control device is arranged in the execution device (300).

Wherein, oil supply mechanism include:

the oil supply seat (219) is internally provided with an oil inlet, an oil outlet channel I and a plunger cavity (205);

at least two sets of plunger mechanisms (206) mounted within the plunger cavity (205); and

a connecting piece (207) for connecting the power shaft (101);

an eccentric part is arranged on the power shaft (101); the rotation of the power shaft (101) is converted into the reciprocating movement of the connecting piece (207) in the set direction;

the connecting piece (207) is respectively connected with the plunger mechanisms (206) at two sides in the setting direction.

2. Electro-hydraulic tool according to claim 1,

the plunger mechanism (206) has at least:

a plunger rod (208) which is connected with the connecting piece (207) at the rear end part and is inserted into the corresponding plunger cavity (205) at the front end part;

the rotation of the eccentric shaft (101) drives the ends of at least two plunger rods (208) to alternately reciprocate in the plunger cavity (205).

3. The electro-hydraulic tool of claim 2, wherein:

the connecting piece (207) is an annular piece, the rear end part of the plunger rod (208) is connected to the annular piece, and the end part of the eccentric shaft (101) is arranged in the annular piece and movably abutted against the rear end part of the plunger rod (208) or the inner wall of the annular piece.

4. The electro-hydraulic tool of claim 3, wherein:

the end face of the oil supply seat (209) is formed with a first limiting part (209), and the side wall of the annular part moves along the side wall of the first limiting part (209) and is used for limiting the position of the annular part so that the annular part moves along the axial direction of the plunger rod (208).

5. The electro-hydraulic tool of claim 1 or 4, wherein:

the eccentric shaft (101) is sleeved with a first gasket (210), and the first gasket (210) is abutted against the end face of the connecting piece (207);

the end part of the first limiting part (209) is provided with a first clamping groove (211), and the position of the first gasket (210) is restrained by clamping the first clamping groove (211) through a clamping piece (212), so that the position of the connecting piece (207) is restrained.

6. The electro-hydraulic tool of any one of claims 1-4,

the oil control device (400) has at least:

the rear end of the oil control valve core (401) is arranged in an oil control column (402) in the middle of the pump body (201), and an oil control channel (403) capable of conducting the hydraulic cavity (303) and the oil cavity (202) is formed in the oil control valve core (401);

an oil control limit plate (404) which is arranged at the end part of the piston (302) of the actuating device (300);

the end part of the oil control valve core (401) is formed with an oil control plug (405) for abutting against the front end of the sealed oil control column;

when the piston (302) of the actuating device (300) moves to a set position, the oil control limiting plate (404) pushes the oil control valve core (401), so that the oil control channel (403) is communicated;

when the piston (302) of the actuating device (300) retracts to the second set position, the oil control valve core (401) is pushed forcibly to close the oil control channel (403).

7. The electro-hydraulic tool of claim 6, wherein:

the oil control plug (405) is sleeved with a buffer spring I (406), the middle of the oil control limiting plate (404) is provided with an oil control hole (407), the front end of the oil control column penetrates through the oil control hole (407) and is arranged in the piston (302), and the end part of the buffer spring I (406) is movably abutted to the oil control limiting plate (404).

And a second buffer spring (408) is sleeved on the oil control valve core (401), and the end part of the second buffer spring (408) is respectively abutted against the oil control column (402) and the oil control plug (405) and used for supporting the buffer oil control valve core (401).

8. The electro-hydraulic tool of claim 6, wherein:

a hydraulic cavity (303) is formed in the executing device (300), the piston (302) is arranged in the hydraulic cavity (303) to divide the hydraulic cavity (303) into a hydraulic extending cavity (305) and a hydraulic retracting cavity (306);

an oil inlet channel (203) is formed in the pump body (201), and the oil inlet channel (203) comprises an oil inlet channel I (214) and an oil inlet channel III (215) communicated with the hydraulic stretching cavity (305);

a reset oil channel (216) is formed in the pump body (201), and the reset oil channel (216) is communicated with a hydraulic retraction cavity (306);

an oil passing part (409) is formed on the outer wall of the lower end of the oil control valve core (401);

when the oil control valve core (401) moves axially, the oil inlet flow passage I (214) is switched to be communicated with the oil inlet flow passage III (215) or the reset oil passage (216).

9. The electro-hydraulic tool of claim 8, wherein:

the first oil inlet flow passage (214), the third oil inlet flow passage (215) and the reset oil passage (216) are distributed in the pump body (201) along the moving direction of the oil control valve core (401).

10. The electro-hydraulic tool of claim 8, wherein:

at least two oil passing parts (409) are formed on the outer wall of the lower end of the oil control valve core (401), and a second limiting part (410) is further arranged at the lower end of the oil control valve core (401);

when the second limiting portion (410) abuts against the lower end face of the pump body (201), the first oil inlet flow passage (214) and the reset oil passage (216) are communicated through the oil passing portion (409).

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