An electric hydraulic tool

Abstract

The present invention relates to the technical field of electric hydraulic tools, and in particular to an electric hydraulic tool, comprising: a driving device for providing power; an oil pump device, the oil pump device comprising a pump body and an oil supply mechanism; and an actuator, which is connected to the oil pump device; and an oil control device, which is installed on the oil pump device, and the front end is placed in the actuator; wherein the oil supply mechanism comprises: an oil supply seat, which is provided with an oil inlet, an oil outlet channel and a plunger cavity; at least two groups of plunger mechanisms, which are installed in the plunger cavity; and a connecting piece, which is used to connect an eccentric shaft; an eccentric part is provided on the eccentric shaft; the rotation of the eccentric shaft is converted into a reciprocating movement of the connecting piece in a set direction; the connecting piece is respectively connected to the plunger mechanism on both sides of the set direction. The present invention has stable operation, low failure rate, guaranteed use efficiency and service life, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of electric hydraulic tools, in particular to an electric hydraulic tool. Background Art

[0002] There are many types of electric hydraulic tools, such as punching machines, shearing machines, crimping pliers and other tools. A complete hydraulic tool system consists of five parts, namely power components, actuators, control components, auxiliary components and hydraulic oil.

[0003] Existing hydraulic tools, such as Chinese patent 201020529262.4, discloses a handheld steel bar quick breaker, which is mainly composed of a rechargeable battery, a DC motor, a speed control switch, a hydraulic cylinder, a piston rod, and a blade. A high-pressure plunger pump, a relief valve, and a one-way valve are arranged 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 a rechargeable battery. The DC motor is connected to the hydraulic cylinder through a coupling. When the DC motor rotates, it drives the high-pressure plunger pump in the hydraulic cylinder to generate a hydraulic fluid with a high pressure of 63MPa, which drives the piston rod to move forward. When the piston rod drives the blade forward, it cuts the object to be cut.

[0004] However, the existing technology has the following problems

[0005] 1. The existing piston assembly is designed using a plunger cap and a spring. After long-term use, the spring may break or fail, causing the machine to not work as a whole or to be inefficient, such as poor hydraulic effect, or even debris generated after the spring breaks, which enters the oil channel and causes blockage.

[0006] 2. During use, since the metal itself has a certain elasticity and will shrink, the mold is easily clamped and stuck, causing the equipment to be unable to reset, affecting the normal use of the equipment and affecting efficiency.

[0007] 3. The relative fixed angles of the grip and handle of the device are unchanged and cannot be adjusted according to the usage scenario or usage habits, which is inconvenient to use. Summary of the invention

[0008] The object of the present invention is to provide an electric hydraulic tool which is easy to use and compact in structure.

[0009] The object of the present invention is achieved in that:

[0010] An electric hydraulic tool comprising:

[0011] A driving device for providing power;

[0012] An oil pump device, comprising a pump body and an oil supply mechanism; and

[0013] an actuator device connected to the oil pump device; and

[0014] An oil control device, which is mounted on the oil pump device and has its front end placed in the actuator device;

[0015] Wherein, the oil supply mechanism comprises:

[0016] The oil supply seat has an oil inlet, an oil outlet channel and a plunger cavity provided therein;

[0017] At least two sets of plunger mechanisms installed in the plunger chamber; and

[0018] A connecting piece, used for connecting the eccentric shaft;

[0019] The eccentric shaft is provided with an eccentric portion; the rotation of the eccentric shaft is converted into a reciprocating movement of the connecting member in a set direction;

[0020] The connecting member is respectively connected to the plunger mechanism on both sides of the set direction.

[0021] Preferably, the plunger mechanism has at least:

[0022] A plunger rod, the rear end of which is connected to the connecting piece and the front end of which is inserted into the corresponding plunger cavity;

[0023] The rotation of the eccentric shaft drives the ends of at least two plunger rods to move back and forth alternately in the plunger cavity.

[0024] Preferably, the connecting member is an annular member, the rear end of the plunger rod is connected to the annular member, and the end of the eccentric shaft is placed in the annular member and movably abuts against the rear end of the plunger rod or the inner wall of the annular member.

[0025] Preferably, the end surface of the oil supply seat is formed with a limiting portion 1, and the side wall of the annular member moves along the side wall of the limiting portion 1 to limit the position of the annular member so that the annular member moves along the axial direction of the plunger rod.

[0026] Preferably, a washer 1 is sleeved on the eccentric shaft, and the washer 1 abuts against the end surface of the connecting piece;

[0027] A clamping groove 1 is formed at the end of the limiting portion 1, and the position of the washer 1 is constrained by the clamping piece being clamped in the clamping groove 1, thereby constraining the position of the connecting piece.

[0028] Preferably, the oil control device at least has:

[0029] The oil control valve core has a rear end arranged in the oil control column in the middle of the pump body, and an oil control channel capable of conducting the hydraulic cavity and the oil chamber is provided in the oil control valve core;

[0030] An oil control limit plate, which is installed at the end of the piston of the actuator;

[0031] The end of the oil control valve core is formed with an oil control plug, which is used to abut against the front end of the sealing oil control column;

[0032] When the piston of the actuator moves to the set position 1, the oil control limit plate pushes the oil control valve core, thereby opening the oil control channel;

[0033] When the piston of the actuator retracts to the set position 2, the oil control valve core is forced to close the oil control channel.

[0034] Preferably, the outer sleeve of the oil control plug is provided with a buffer spring 1, the middle of the oil control limit plate is provided with an oil control hole, the front end of the oil control column passes through the oil control hole and is placed in the piston, and the end of the buffer spring 1 movably abuts against the oil control limit plate;

[0035] The oil control valve core is sleeved with a second buffer spring, the ends of which respectively abut against the oil control column and the oil control plug to support the buffer oil control valve core.

[0036] Preferably, a hydraulic chamber is formed in the actuator, and a piston is placed in the hydraulic chamber, dividing the hydraulic chamber into a hydraulic extension chamber and a hydraulic retraction chamber;

[0037] An oil inlet passage is provided in the pump body, and the oil inlet passage includes an oil inlet flow passage 1 and an oil inlet flow passage 3 communicating with the hydraulic extension chamber;

[0038] A reset oil passage is provided in the pump body, and the reset oil passage is connected to the hydraulic retraction chamber;

[0039] The outer wall of the lower end of the oil control valve core is formed with an oil passing portion;

[0040] When the oil control valve core moves axially, the oil inlet flow channel 1 is switched to be connected with the oil inlet flow channel 3 or the reset oil channel.

[0041] Preferably, the oil inlet channel 1, the oil inlet channel 3 and the reset oil channel are distributed in the pump body along the moving direction of the oil control valve core.

[0042] Preferably, at least two oil-passing portions are formed on the outer wall of the lower end of the oil control valve core, and a second limiting portion is also provided at the lower end of the oil control valve core;

[0043] When the limiting portion 2 abuts against the lower end surface of the pump body, the oil passing portion connects the oil inlet channel 1 and the reset oil channel.

[0044] Compared with the prior art, the present invention has the following outstanding and beneficial technical effects:

[0045] 1. The scheme of the present application cancels the scheme of using spring reset in the prior art, and adopts a connecting piece to drive the plunger mechanism to move back and forth to realize the action of oil feeding and reset. The adoption of this scheme can ensure the stability of the movement of the plunger mechanism, and there is no situation of spring breaking or spring failure in the prior art. It can ensure the stability of the operation of the plunger mechanism and the normal oil supply. At the same time, it can provide higher hydraulic pressure, reduce the generation of debris, reduce the occurrence of oil circuit blockage and scratching of the plunger cavity, and ensure the service life.

[0046] 2. The limiting part of the present invention is mainly used to constrain the moving position of the connecting member, ensure the accuracy of the moving direction of the connecting member, and further ensure the working stability of the plunger mechanism and the plunger effect.

[0047] 3. The present invention has a card slot formed at the end of the limiting part 1, and the position of the washer 1 is constrained by the card connector being engaged in the card slot 1, thereby constraining the position of the connecting part, preventing the connecting part from moving in the axial direction of the eccentric shaft, reducing axial shaking, and ensuring the stability and accuracy of the equipment.

[0048] 4. The design of the oil control device of the present invention can realize automatic oil return of the equipment and automatic retraction of the piston without manual operation, which is simpler to use and improves the use efficiency.

[0049] 5. On the one hand, during the pressure relief process, the buffer spring of the present invention can support the oil control plug due to the continuous decrease of oil pressure, thereby preventing the oil control channel from being closed before the pressure relief is completed, thereby ensuring the smooth completion of the pressure relief; on the other hand, it can buffer the oil control plug from abutting against the upper end of the oil control column, thereby avoiding a rapid collision that causes a loose seal between the oil control plug and the end of the oil control column, thereby solving the problem of unstable oil pressure in the hydraulic cavity and affecting the hydraulic effect.

[0050] 6. The active reset structure of the present invention can realize active reset of the piston, which can effectively avoid the occurrence of sticking, and ensure the normal use and efficiency of the equipment.

[0051] 7. The reversing device of the present invention can automatically adjust the angle between the grip and the handle according to the user's usage habits or usage scenarios, which is convenient for use. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0053] Figure 2 It is an overall cross-sectional view of the present invention.

[0054] Figure 3 It is a structural schematic diagram of the oil supply mechanism and the plunger mechanism of the present invention.

[0055] Figure 4It is a schematic diagram of the top structure of the oil supply mechanism and the plunger mechanism of the present invention.

[0056] Figure 5 It is an exploded view of the oil supply mechanism and the plunger mechanism of the present invention.

[0057] Figure 6 It is a cross-sectional view of the actuator of the present invention in a retracted state.

[0058] Figure 7 This is a state diagram of the piston of the present invention when it extends to a set position.

[0059] Figure 8 This is a state diagram of the oil control valve core being moved by the piston of the present invention to open the oil control channel.

[0060] Fig. 9 This is the second partial cross-sectional view of the present invention.

[0061] Fig.10 for Figure 7 A magnified image of area A.

[0062] Fig.11 It is a schematic diagram of the bottom structure of the present invention.

[0063] Fig.12 for Fig.11 Cross-sectional view in the AA direction.

[0064] Fig.13 It is an exploded view of the oil control device of the present invention.

[0065] Fig.14 It is a schematic diagram of the end surface structure of the pump body of the present invention.

[0066] Fig.15 for Fig.14 Cross-sectional view along the CC direction.

[0067] Fig.16 It is an exploded view of the reversing device of the present invention.

[0068] Fig.17 For the present invention Figure 2 A magnified view of area D.

[0069] Fig.18 It is a cross-sectional view of the reversing device of the present invention.

[0070] Reference numerals:

[0071] 100, driving device; 101, eccentric shaft; 102, motor; 103, battery; 104, reducer;

[0072] 200, oil pump device; 201, pump body; 202, oil chamber; 203, oil inlet passage; 204, oil supply mechanism; 205, plunger cavity; 206, plunger mechanism; 207, connecting piece; 208, plunger rod; 209, limiter part 1; 210, washer 1; 211, clamping groove 1; 212, clamping piece; 213, washer 2; 214, oil inlet flow channel 1; 215, oil inlet flow channel 3; 216, reset oil channel; 217, pressure-stabilizing oil circuit; 218, one-way valve 1; 219, oil supply seat; 220, plunger boss; 221, one-way valve 2; 222, one-way valve 3; 223, needle roller bearing;

[0073] 300, actuator; 301, mold base; 302, piston; 303, hydraulic chamber; 304, hydraulic spring; 305, hydraulic extension chamber; 306, hydraulic retraction chamber;

[0074] 400, oil control device; 401, oil control valve core; 402, oil control column; 403, oil control channel; 404, oil control limit plate; 405, oil control plug; 406, buffer spring 1; 407, oil control hole; 408, buffer spring 2; 409, oil passing part; 410, limit part 2;

[0075] 500, reversing device; 501, grip; 502, handle; 503, connecting cover; 504, motor flange; 505, positioning mechanism; 506, positioning groove; 507, positioning piece; 508, positioning spring; 509, positioning hole; 510, restraining mechanism; 511, strip mounting groove; 512, arc-shaped spring piece; 513, arc-shaped boss; 514, connecting flange; 515, limiting edge; 516, movable gap; 517, convex ring. DETAILED DESCRIPTION

[0076] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings.

[0077] like Figure 1 and Figure 2 As shown, an electric hydraulic tool includes: a driving device 100 for providing power, an oil pump device 200 for providing hydraulic oil, an actuator 300 for driving the mold to move, and an oil control device 400 for controlling the flow of hydraulic oil, wherein the oil pump device 200 includes a pump body 201, an oil supply mechanism 204 and a plunger mechanism 206.

[0078] The output end of the driving device 100 is connected to the oil pump device 200, the end of the oil pump device 200 is connected to the execution device 300, the oil control device 400 is installed in the execution device 300, and the mold is installed on the execution device 300. The mold is driven to move by the execution device 300 to achieve the corresponding functional role.

[0079] The type of the die may be a crimping pliers die, a scissors die for shearing metal, a punching die of a punching machine, and the like.

[0080] The initial working process is that the driving device 100 works, thereby driving the oil pump device 200 to work, so that the hydraulic oil flows into the actuator 300, thereby driving the movement of the movable mold on the actuator 300, and cooperating with the fixed mold to realize the corresponding work.

[0081] The driving device 100 mentioned above mainly includes: a motor 102, a battery 103 and a reducer 104. The output end of the reducer 104 is connected to an eccentric shaft 101. The motor 102 works through the power provided by the battery 103 to realize the power output of the eccentric shaft 101 of the reducer 104.

[0082] like Figure 3-Figure 5 As shown, the oil pump device 200 mainly includes: a pump body 201 and an oil supply mechanism 204, and the oil supply mechanism 204 includes a connecting member 207 and at least two groups of plunger mechanisms 206;

[0083] An oil chamber 202 is formed inside the pump body 201 , an oil supply mechanism 204 is installed in the oil chamber 202 , and hydraulic oil is mainly stored in the oil chamber 202 .

[0084] An oil inlet passage 203 connected to the actuator 300 is formed inside the pump body 201, and a plunger cavity 205 is opened inside the oil supply mechanism 204. The plunger cavity 205 connects the oil chamber 202 and the oil inlet passage 203, so that the hydraulic oil can enter the hydraulic cavity 303 of the actuator 300 from the oil chamber 202.

[0085] The plunger mechanism 206 is installed in the oil supply mechanism 204. When there are two groups, they are installed symmetrically, and when there are three groups, the axial distribution is equal in angle. After the installation is completed, the rear end of the plunger mechanism 206 is connected to the connecting piece 207, and the end of the eccentric shaft 101 is placed in the middle of two or three or more groups of plunger mechanisms 206, that is, inside the connecting piece 207. The rotation of the eccentric shaft 101 drives the connecting piece 207 to reciprocate in the set direction, thereby driving the plunger mechanism 206 to alternately reciprocate, realizing the flow of hydraulic oil, generating hydraulic pressure, and realizing work.

[0086] When there are two groups of plunger mechanisms 206 , the plunger mechanisms 206 are distributed on two opposite sides of the connecting member 207 . At this time, the set direction refers to the axial direction of the two plunger cavities 205 .

[0087] When there are three or four groups of plunger mechanisms 206, the plunger mechanisms 206 are circumferentially distributed around the connecting member 207. At this time, the set direction refers to the rotation trajectory of the eccentric shaft, that is, the annular direction.

[0088] The existing piston 302 assembly is designed by using a plunger cap and a spring. The eccentric shaft 101 overcomes the elastic force of the spring to push the plunger cap to move. The spring resets the plunger cap, thereby generating hydraulic pressure to move the piston 302 column and drive the upper mold.

[0089] However, after long-term use, the spring may break or fail due to increased temperature, causing the machine to malfunction or have low efficiency. For example, the hydraulic effect is poor, or even debris generated by a broken spring may enter the oil channel and cause blockage.

[0090] In order to solve the above-mentioned problem, in this solution, the plunger mechanism 206 and the oil supply mechanism 204 are improved, and the specific solution is as follows.

[0091] like Figure 5 As shown, the oil supply mechanism 204 includes an oil supply seat 219, and the lower end surface of the oil supply seat 219 is protrudingly formed with a plurality of plunger bosses 220. In the present embodiment, two plunger bosses 220 are provided, and are symmetrically arranged. A plunger cavity 205 is horizontally formed in the plunger boss 220, and an oil inlet is provided on the side of the plunger boss 220, and the oil inlet connects the oil chamber 202 and the plunger cavity 205. An oil outlet channel 1 is formed on the plunger boss 220, and the oil outlet channel 1 passes through the end surface of the oil supply seat 219, and the oil outlet channel 1 connects the plunger cavity 205 and the oil inlet channel 203.

[0092] When the upper end surface of the oil supply seat 219 abuts against the lower end of the pump body 201 , the oil outlet passage 1 is connected to the oil inlet passage 203 .

[0093] At the same time, a check valve 221 is installed at the position where the oil outlet channel 1 is connected to the oil inlet channel 203, and a check valve 3 222 is installed at the oil inlet.

[0094] The plunger mechanism 206 includes a plunger rod 208;

[0095] The connecting piece 207 is placed 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 to the connecting piece 207 , and the connecting piece 207 is connected to the eccentric shaft 101 .

[0096] The rotation of the eccentric shaft 101 drives the plunger rod 208 to move back and forth alternately, so that its end moves in the plunger cavity 205, and cooperates with the above-mentioned one-way valve 221 and one-way valve 3 222 to drive the hydraulic oil to flow for oil supply operation.

[0097] The solution of the present application cancels the solution of using spring reset in the prior art, and uses the connecting piece 207 to drive the reciprocating movement of the plunger rod 208 to achieve the action of oil feeding and reset. The use of this solution can ensure the stability of the movement of the plunger rod 208, and there is no situation that the spring breaks or the spring fails in the prior art. The stability of the operation of the plunger mechanism 206 can be ensured, the normal oil supply can be ensured, and at the same time, higher hydraulic pressure can be provided, and the generation of debris can be reduced, and the situation of oil circuit blockage and scratching of the plunger cavity 205 can be reduced, thereby ensuring the service life.

[0098] The specific connecting member 207 can be a ring-shaped member, the outline of which is close to a square, and the included angle is an arc-shaped smooth transition.

[0099] The rear end of the plunger rod 208 is folded outward to form a folded edge, and the front end passes through the annular member, and the folded edge of the rear end abuts against the inner wall of the annular member to realize the connection between the plunger rod 208 and the connecting member 207; both ends of the eccentric shaft 101 are fixed by bearings, so that the eccentric part is located between the annular members, and a needle bearing 223 is sleeved on the eccentric part, and the eccentric shaft 101 drives the needle bearing 223 to move in the annular member. During the movement, at least one of the plunger rods 208 is pressed into the plunger cavity 205 to drive the hydraulic oil, and the corresponding other plunger rods 208 are pulled out of the plunger cavity 205, and the alternating reciprocating movement is realized to realize the formation of hydraulic pressure.

[0100] The connecting member 207 is used to replace the existing spring to ensure the operational stability and efficiency of the overall mechanism.

[0101] Needle bearing 223 can reduce wear and ensure hydraulic effect.

[0102] like Figure 5 As shown, in order to ensure that the connecting member 207 always moves in the axial direction of the plunger cavity 205, a limiting portion 209 is formed on both sides between the plunger boss 220, and the side wall of the connecting member 207 movably abuts against the inner wall of the limiting portion 209. The limiting portion 209 is mainly used to constrain the moving position of the connecting member 207, ensure the accuracy of the moving direction of the connecting member 207, and further ensure the working stability and plunger effect of the plunger mechanism 206.

[0103] The limiting portion 209 can be in the form of a boss, or a groove formed on the oil supply seat, etc., as long as it can constrain the moving position of the connecting member 207.

[0104] At the same time, a washer 210 and a washer 213 are sleeved on the eccentric shaft 101. The washer 210 and the washer 213 are respectively placed at the two ends of the connecting piece 207. The washer 213 is installed on the end face of the oil supply seat 219. On the one hand, it fixes the bearing used to fix the end of the eccentric shaft 101. On the other hand, it isolates the contact between the needle bearing 223 and the connecting piece 207 and the oil supply seat 219 to reduce the wear on the oil supply seat 219 and ensure the service life and stability of use.

[0105] A slot 211 is formed at the end of the limiting portion 209, and a snap-in member 212 is snapped into the slot 211 to constrain the position of the washer 210, thereby constraining the position of the connecting member 207, preventing the connecting member 207 from moving in the axial direction of the eccentric shaft 101, reducing axial shaking, and ensuring the stability and accuracy of the equipment.

[0106] The clamping member 212 in this embodiment adopts a clamping spring, but may also adopt a pin.

[0107] A magnet is also provided on the oil supply seat 219, which is mainly used to absorb metal impurities in the hydraulic oil to avoid clogging and scratching the oil circuit.

[0108] The outer wall of the needle bearing 223 may also abut against the inner wall of the annular member, in which case the end of the plunger rod 208 does not protrude from the inner wall of the annular member.

[0109] At the same time, the long side L of the annular member is greater than the short side S. This design is to ensure that the eccentric shaft 101 can only drive the annular member to move along the axis of the plunger cavity 205, and will not move in other directions.

[0110] [Variation 1]

[0111] The connecting member 207 may also be designed as a connecting rod, with one end of the connecting rod connected to the outer ring of the needle bearing 223 and the other end connected to the plunger rod 208 , so that the rotation of the eccentric shaft 101 can also achieve the alternating movement of the plunger rod 208 .

[0112] like Figure 2 and Figure 6 As shown, the actuator 300 mainly includes: a mold base 301, a piston 302 and a hydraulic spring 304;

[0113] The end of the mold base 301 is connected to the end surface of the pump body 201 to form a hydraulic chamber 303, and the piston 302 and the hydraulic spring 304 are both installed in the hydraulic chamber 303; the front end of the piston 302 passes through the mold base 301 for installing the movable mold, and the ends of the hydraulic spring 304 respectively abut against the piston 302 and the mold base 301 to make the piston 302 have a tendency to approach the pump body 201. At the same time, the piston 302 divides the hydraulic chamber 303 into a hydraulic extension chamber 305 and a hydraulic retraction chamber 306, and the hydraulic spring 304 is placed in the hydraulic retraction chamber 306.

[0114] The oil inlet passage 203 mentioned above is mainly used to conduct the hydraulic extension chamber 305 .

[0115] A channel for returning oil may be provided in the mold base 301 and the pump body 201 to achieve oil return and ensure the reset of the piston 302 .

[0116] The method adopted can be the existing manual oil return design. The structure of the manual oil return will not be described in detail, as it belongs to the prior art.

[0117] However, manual oil return is troublesome to use. In order to make it easier to use, this solution also designs an oil control device 400 that can automatically return oil. The specific solution of the oil control device 400 is as follows, which can be referred to Figure 6-Figure 8 .

[0118] The oil control device 400 includes: an oil control valve core 401, an oil control limit plate 404, a buffer spring 1 406 and a buffer spring 2 408;

[0119] An oil control column 402 is formed or installed in the middle of the upper end surface of the pump body 201. The oil control column 402 is hollow inside and connects the upper and lower end surfaces. The lower end of the oil control column 402 is connected to the oil chamber. The inner diameter of the upper end of the oil control column 402 is slightly larger than the other parts.

[0120] The lower end of the piston 302 is recessed inward to form a chamber for accommodating the oil control column 402. The rear end of the oil control valve core 401 is placed in the oil control column 402, and an oil control plug 405 is formed at the front end of the oil control valve core 401. An oil control channel 403 is opened in the oil control valve core 401, and the openings at both 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.

[0121] The oil control limit plate 404 is installed on the lower end of the piston 302 , and an oil control hole 407 is opened in the middle of the oil control limit plate 404 . 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.

[0122] The oil supply seat 219 is provided with an oil hole, so as to realize the conduction between the oil control channel 403 and the oil chamber 202 .

[0123] When the oil pump device starts to work and the hydraulic oil starts to push the piston 302 to extend, due to the continuous increase in oil pressure, when the oil control plug 405 is not subjected to additional external force, the oil pressure will continue to act on the oil control plug 405, so that the oil control plug 405 can seal the end of the oil control column 402, thereby realizing the normal extension of the piston and realizing the function of the hydraulic cylinder.

[0124] During the extension of the piston 302, the oil control valve core 401 does not move. At this time, the hydraulic retraction chamber 306 is connected to the oil chamber 202 through the reset oil channel 216. The hydraulic retraction chamber 306 gradually decreases, and the hydraulic oil in the hydraulic retraction chamber 306 can flow back to the oil chamber through the reset oil channel 216, thereby realizing the smooth extension of the piston 302.

[0125] like Figure 7 and Figure 8 As shown, when the piston 302 of the actuator 300 moves to the set position 1, the oil control limit plate 404 pushes the oil control valve core 401, thereby making the oil control channel 403 conductive.

[0126] Setting position one refers to 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 the oil control plug 405, causing the oil control valve core 401 to shift, and the end of the oil control valve core 401 is separated from the front end of the oil control column. At this time, the high-pressure hydraulic oil in the hydraulic extension chamber 305 will flow back to the oil chamber 202 along the oil control channel 403 to achieve pressure relief, and the hydraulic spring 304 presses the piston 302 back to the initial position.

[0127] like Figure 6 As shown, when the piston 302 of the actuator 300 retracts to the set position 2, the oil control valve core 401 is forced to close the oil control channel 403 .

[0128] Setting position two refers to when the piston 302 is retracted to the initial state, that is, when the actuator 300 is in the retracted state, at this time, no hydraulic oil is provided to the hydraulic extension chamber 305, and under the action of the hydraulic spring 304, the piston 302 presses the oil control plug 405, forcing the oil control plug 405 to move, so that the end face of the oil control plug 405 abuts against the end face of the oil control column 402, thereby sealing the oil control channel 403 and closing the oil control channel 403. At this time, the hydraulic oil in the hydraulic extension chamber 305 cannot flow back to the oil chamber 202 through the oil control channel 403.

[0129] When it is used again, the above process is repeated to carry out the work.

[0130] The buffer spring 1 406 is sleeved outside the oil control plug 405 , the front end of the oil control column passes through the oil control hole 407 and is placed in the piston 302 , and the end of the buffer spring 1 406 movably abuts against the oil control limit plate 404 .

[0131] The buffer spring 1 406 mainly plays a buffering role, that is, after the piston 302 extends to a certain extent, the oil control limit plate 404 begins to abut against the buffer spring 1 406, and then as the piston 302 continues to move, the buffer spring 1 406 is compressed to a certain extent, overcoming the pressure of the oil pressure on the oil control plug 405 to push the oil control plug 405 to move, thereby opening the oil control channel 403.

[0132] The buffer spring 406 realizes flexible pressure application between the oil control limit plate 404 and the oil control plug 405, thereby avoiding collision and deformation, reducing noise and extending service life.

[0133] The second buffer spring 408 is installed in the upper end of the oil control column 402, and the ends of the second buffer spring 408 abut against the oil control column 402 and the oil control plug 405 respectively.

[0134] On the one hand, during the pressure relief process, the buffer spring 408 can support the oil control plug 405 due to the continuous drop in oil pressure, thereby preventing the oil control channel 403 from being closed before the pressure relief is completed, thereby ensuring the smooth completion of the pressure relief; on the other hand, it can buffer the oil control plug 405 from abutting against the upper end of the oil control column 402, thereby avoiding a rapid collision, which would lead to a poor seal between the oil control plug 405 and the end of the oil control column 402, resulting in unstable oil pressure in the hydraulic chamber 303 and affecting the hydraulic effect.

[0135] The above process can be understood as the process of automatic pressure relief and oil return. When combined with the use scenarios of other equipment, such as the use of punching tools, when punching, the metal itself has a certain elasticity and will shrink. After punching, the punching die may be clamped, causing the machine to be unable to reset, affecting the normal use of the equipment and affecting efficiency.

[0136] In order to solve the above problems, a structure capable of active resetting is designed, as follows.

[0137] like Figure 9-Figure 15 As shown, the oil inlet passage 203 includes an oil inlet passage 1 214 and an oil inlet passage 3 215 connected to the hydraulic extension chamber 305. At the same time, a reset oil passage 216 is opened in the pump body 201, and the reset oil passage 216 is connected to the hydraulic retraction chamber 306. 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 passage 1 214 can be switched to be connected to the oil inlet passage 3 215 or the reset oil passage 216.

[0138] That is, when the piston is in the set position two, no hydraulic oil is supplied to the hydraulic extension chamber 305, that is, when the piston 302 is in the retracted state, the oil passage 409 conducts the oil inlet channel 1 214 and the oil inlet channel 3 215. At this time, the hydraulic oil in the oil chamber 202 can be supplied to the hydraulic extension chamber 305 under the action of the oil pump, and the hydraulic oil in the hydraulic retraction chamber 306 can flow back to the oil chamber through the reset oil channel 216, thereby realizing the extension of the piston 302.

[0139] When the piston is in the set position 1, the piston is in the critical position of the extended state, that is, the piston 302 is about to move to the maximum extended state, the oil control limit plate 404 contacts the oil control plug 405, causing the oil control valve core 401 to shift. At this time, the oil passage 409 conducts the oil inlet flow channel 1 214 and the reset oil channel 216, cutting off the connection between the reset oil channel 216 and the oil chamber, that is, the hydraulic oil in the hydraulic extension chamber 305 flows back to the oil chamber 202 through the oil control channel 403. At the same time, due to the switching of the oil circuit, the oil supply path of the oil pump is changed to supply oil to the hydraulic retraction chamber 306, so that the piston 302 returns to the initial position under the action of the hydraulic spring 304 and the oil pressure of the reverse oil supply, realizing the active reset. In this way, even if the punching die is clamped, the piston 302 can be reset under the action of the reverse oil supply to avoid jamming and ensure the normal use of the equipment.

[0140] The oil outlet channel 1 is connected to the oil inlet channel 1 214.

[0141] The outer wall of the lower end of the oil control valve core 401 is formed with at least two oil passing parts 409, which are distributed along the axial direction of the oil control valve core 401, and a second limiting part 410 is also provided at the lower end of the oil control valve core 401; the second limiting part 410 can be a retaining spring or a pin.

[0142] During operation, when oil is supplied to the hydraulic extension chamber 305, one of the oil passing parts 409 is connected to the oil inlet flow channel 1 214 and the oil inlet flow channel 3 215, and the other one is inoperative;

[0143] When the oil control valve core 401 is displaced until the second limit portion 410 abuts against the lower end surface of the pump body 201 , one of the oil passing portions 409 connects the oil inlet channel 1 214 and the reset oil channel 216 , and the other oil passing portion 409 blocks the oil inlet channel 3 215 .

[0144] The function of the second limit part 410 is mainly to ensure the accurate movement of the oil control valve core 401, so as to ensure that the oil passing part 409 can accurately conduct the oil inlet channel 1 214 and the reset oil channel 216. The other oil passing part 409 blocks the oil inlet channel 3 215 to ensure the smooth reset action and the stability of use.

[0145] The mold base 301 is also formed with an oil chamber 2, which is communicated with the oil chamber, mainly to compensate for the lack of hydraulic oil in the oil chamber due to leakage or loss.

[0146] The oil chamber can be formed in the pump body or can be additionally connected to an external oil chamber.

[0147] In order to ensure the balanced flow of hydraulic oil in the hydraulic extension chamber 305 and the hydraulic retraction chamber 306 during the oil supply or pressure relief process, a pressure-stabilizing oil circuit 217 is opened in the oil supply seat 219. The pressure-stabilizing oil circuit 217 connects the oil chamber 202 and the reset oil channel 216, and a one-way valve 218 is provided at the connection between the pressure-stabilizing oil circuit 217 and the reset oil channel 216 to control the hydraulic oil in the hydraulic retraction chamber 306 to flow back to the oil chamber 202.

[0148] In addition to the automatic oil return, a manual oil return device can also be installed. The manual oil return device adopts the existing design, which will not be described in detail. The manual oil return device can relieve pressure at any time, and the usage scenarios are more flexible.

[0149] In actual use, the relative fixed angle between the grip 501 of the existing device and the handle 502 of the drive device 100 is unchanged and cannot be adjusted according to the use scene or usage habits, which is inconvenient to use. This solution also records a reversing device 500, which is installed between the drive device 100 and the oil pump device 200, and the specific structure is as follows.

[0150] The grip 501 is mounted on the mold base 301 , and the handle 502 is on the driving device 100 .

[0151] like Figure 14-18 As shown, the reversing device 500 includes a connecting cover 503, a motor flange 504 and a positioning mechanism 505;

[0152] The connecting cover 503 is connected to the end of the oil pump device 200, the motor flange 504 is connected to the end of the reducer 104, the connecting cover 503 and the motor flange 504 are rotatably connected, the positioning mechanism 505 is installed between the connecting cover 503 and the motor flange 504, and a positioning groove 506 that cooperates with the positioning mechanism 505 is formed on the motor flange 504.

[0153] The positioning mechanism 505 includes a positioning piece 507 and a positioning spring 508. A positioning hole 509 is formed on the connecting cover 503. The positioning spring 508 and the positioning piece 507 are both installed in the positioning hole 509, and the positioning piece 507 is located at the end of the positioning spring 508. The positioning spring 508 can make the positioning piece 507 have a tendency to protrude from the positioning hole 509. The part of the positioning piece 507 protruding from the positioning hole 509 is adapted to the positioning groove 506 to achieve positioning.

[0154] In this design, the connecting cover 503 and the motor flange 504 can rotate 360 ​​degrees, four positioning grooves 506 are arranged circumferentially, and the interval angle between adjacent positioning grooves 506 is 90 degrees. Other numbers of positioning grooves 506 can also be arranged, and the angle can be selected according to actual conditions.

[0155] In this way, the angle between the grip 501 and the handle 502 can be adjusted according to the user's usage habits or usage scenarios, which is convenient for use.

[0156] The number of positioning mechanisms 505 may not be the same as the number of positioning slots 506. In order to constrain the force required for the rotation angle, that is, to prevent a slight twisting of the angle and ensure safety of use, a constraint mechanism 510 is also provided between the connecting cover 503 and the motor flange 504. The function of the constraint mechanism 510 is to increase the force required for rotation and ensure safety of use.

[0157] The restraining mechanism 510 includes a strip-shaped mounting groove 511 and an arc-shaped elastic piece 512 formed on the end surface of the connection cover 503 . The arc-shaped elastic piece 512 is placed in the strip-shaped mounting groove 511 and partially protrudes from the end surface of the connection cover 503 .

[0158] When the connecting cover 503 is connected to the motor flange 504 , the protruding portion of the arc-shaped spring piece 512 is placed in the positioning groove 506 , and the deformation elastic force of the arc-shaped spring piece 512 is greater than the force of the positioning spring 508 .

[0159] An arc-shaped boss 513 is formed on the end surface of the motor flange 504, and the outer wall of the arc-shaped boss 513 movably abuts against the inner wall of the connecting cover 503, which mainly plays a positioning role, on the one hand to ensure the installation positioning; on the other hand to ensure the smoothness of rotation.

[0160] The rotational connection between the connection cover 503 and the motor flange 504 is as follows.

[0161] A connecting flange 514 is connected to the end surface of the motor flange 504 by bolts. The outer wall of the connecting flange 514 is formed with a limiting edge 515, and a movable gap 516 is formed between the limiting edge 515 and the motor flange 504; the inner wall of the connecting cover 503 is formed with a convex ring 517.

[0162] The convex ring 517 is placed in the movable gap 516, and then the motor flange 504 is connected to the connecting flange 514, so that the convex ring 517 can be constrained in the movable gap 516, so that the convex ring 517 can only rotate in the movable gap 516 and cannot undergo axial displacement, thereby achieving connection.

[0163] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An electric hydraulic tool, characterized in that: include: A driving device (100) for providing power; An oil pump device (200), the oil pump device (200) comprising a pump body (201) and an oil supply mechanism; as well as an execution device (300) connected to the oil pump device (200); and An oil control device (400) is mounted on the oil pump device (200), and a front end thereof is placed in the actuator device (300); Wherein, the oil supply mechanism comprises: An oil supply seat (219) is provided with an oil inlet, an oil outlet channel 1 and a plunger cavity (205) therein; At least two sets of plunger mechanisms (206) installed in the plunger chamber (205); and A connecting member (207) for connecting the eccentric shaft (101); An eccentric portion is provided on the eccentric shaft (101); the rotation of the eccentric shaft (101) is converted into a reciprocating movement of the connecting member (207) in a set direction; The connecting member (207) is respectively connected to the plunger mechanism (206) on both sides of the set direction; A washer 1 (210) is sleeved on the eccentric shaft (101) of the driving device (100), and the washer 1 (210) abuts against the end surface of the connecting member (207); The oil control device (400) at least comprises: An oil control valve core (401), the rear end of which 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 chamber (202) is provided in the oil control valve core (401); An oil control limit plate (404) mounted on the end of the piston (302) of the actuator (300); The end of the oil control valve core (401) is formed with an oil control plug (405) for abutting against the front end of the sealing oil control column; When the piston (302) of the actuator (300) moves to the set position 1, the oil control limit plate (404) pushes the oil control valve core (401), thereby opening the oil control channel (403); 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 channel (403); A hydraulic chamber (303) is formed in the actuator (300), and a piston (302) is disposed in the hydraulic chamber (303), so that the hydraulic chamber (303) is divided into a hydraulic extension chamber (305) and a hydraulic retraction chamber (306); An oil inlet passage (203) is provided in the pump body (201), and the oil inlet passage (203) includes an oil inlet passage 1 (214) and an oil inlet passage 3 (215) communicating with the hydraulic extension chamber (305); A reset oil passage (216) is provided in the pump body (201), and the reset oil passage (216) is connected to the hydraulic retraction chamber (306); 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 channel 1 (214) switches to be connected to the oil inlet channel 3 (215) or the reset oil channel (216).

2. The electric hydraulic tool according to claim 1, characterized in that: The plunger mechanism (206) at least comprises: A plunger rod (208), the rear end of which is connected to the connecting piece (207) and the front end of which is inserted into the corresponding plunger cavity (205); The rotation of the eccentric shaft (101) drives the ends of at least two plunger rods (208) to move back and forth alternately in the plunger cavity (205).

3. The electric hydraulic tool according to claim 2, characterized in that: The connecting member (207) is an annular member, the rear end of the plunger rod (208) is connected to the annular member, and the end of the eccentric shaft (101) is placed in the annular member and movably abuts against the rear end of the plunger rod (208) or the inner wall of the annular member.

4. The electric hydraulic tool according to claim 3, characterized in that: The end surface of the oil supply seat (219) is formed with a limiting portion (209), and the side wall of the annular member moves along the side wall of the limiting portion (209) to limit the position of the annular member so that the annular member moves along the axial direction of the plunger rod (208).

5. The electric hydraulic tool according to claim 4, characterized in that: A clamping groove (211) is formed at the end of the limiting portion (209), and the position of the washer (210) is constrained by the clamping member (212) being clamped in the clamping groove (211), thereby constraining the position of the connecting member (207).

6. The electric hydraulic tool according to any one of claims 1 to 4, characterized in that: The outer sleeve of the oil control plug (405) is provided with a buffer spring (406), the middle portion of the oil control limit plate (404) is provided with an oil control hole (407), the front end of the oil control column (402) passes through the oil control hole (407) and is placed in the piston (302), and the end of the buffer spring (406) movably abuts against the oil control limit plate (404); The oil control valve core (401) is sleeved with a second buffer spring (408), the ends of which respectively abut against the oil control column (402) and the oil control plug (405) to support the buffer oil control valve core (401).

7. The electric hydraulic tool according to any one of claims 1 to 4, characterized in that: The oil inlet channel 1 (214), the oil inlet channel 3 (215) and the reset oil channel (216) are distributed in the pump body (201) along the moving direction of the oil control valve core (401).

8. The electric hydraulic tool according to any one of claims 1 to 4, characterized in that: The outer wall of the lower end of the oil control valve core (401) is formed with at least two oil passing parts (409), and a second limiting part (410) is also provided at the lower end of the oil control valve core (401); When the second limiting portion (410) abuts against the lower end surface of the pump body (201), the oil passing portion (409) connects the first oil inlet passage (214) and the reset oil passage (216).

Images