CN111254763B

CN111254763B - Hydraulic track lifting device

Info

Publication number: CN111254763B
Application number: CN202010062896.1A
Authority: CN
Inventors: 王传焕; 陈全威; 刘云鹏
Original assignee: Shaoxing Huayang Railway Equipment Co ltd
Current assignee: Shaoxing Huayang Railway Equipment Co ltd
Priority date: 2020-01-19
Filing date: 2020-01-19
Publication date: 2021-10-15
Anticipated expiration: 2040-01-19
Also published as: CN111254763A

Abstract

The invention discloses a hydraulic track jack, which comprises a base, an oil cylinder and an oil tank, wherein the oil cylinder comprises an oil cylinder sleeve, a piston and a small piston, the hydraulic track jack further comprises a plunger pump, the plunger pump comprises a plunger seat and a pump body arranged in the plunger seat, the oil tank is arranged at one end of the plunger seat, a driving motor is arranged at the other end of the plunger seat, the oil cylinder is arranged on the plunger seat, the plunger screen pump is in transmission connection with the driving motor, the oil tank, the plunger pump and the small piston are connected through oil passages, the oil tank and the piston are connected through an oil suction passage, an oil suction check valve is arranged on the oil suction passage, and all the oil passages are arranged in the plunger seat. After the driving motor is started, the plunger pump is driven to rotate, so that oil in the oil tank is sent into the small piston through the oil way, the small piston can drive the piston to synchronously stretch out, and in the process that the piston stretches out, the inner cavity of the piston forms negative pressure, so that the oil is sucked into the piston through the oil suction channel, and compensation is formed on the pressure change in the piston.

Description

Hydraulic track lifting device

Technical Field

The invention relates to the technical field of railway line maintenance equipment, in particular to a hydraulic track lifting and pulling device.

Background

In the chinese patent with the publication number CN 205603985U, a hydraulic track lifting and lining device for railway is disclosed, which comprises a base, a cylinder seat, a cylinder, an oil tank and a track lifting and lining mechanism. The pressure relief valve assembly is arranged in the right side of the oil cylinder seat. One side above the oil cylinder seat is provided with a safety valve and an oil supplementing valve. The front and the rear of the upper part of the cylinder seat are respectively provided with a first check valve component and a second check valve component. First and second plungers are provided above the first and second check valve seats in the first and second check valve assemblies, respectively. The first plunger piston and the second plunger piston are connected through a connecting rod mechanism, and the right side surface of the oil cylinder seat is provided with a sequence valve assembly. The rear end of an oil cylinder sleeve of the oil cylinder is arranged in an oil cylinder slot on the front end surface of the oil cylinder seat, and the track lifting and shifting mechanism comprises a lifting lever and a track lifting wheel.

The oil cylinder in the prior art is driven by a manually driven plunger pump, and the efficiency of manual operation is low and the operation is very laborious.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a hydraulic track lifting device which has the advantage of automatically controlling the starting and stopping of an oil cylinder.

The technical purpose of the invention is realized by the following technical scheme:

the utility model provides a hydraulic pressure plays and pulls out way ware, includes base, hydro-cylinder and oil tank, the hydro-cylinder includes cylinder liner, piston and little piston, still including a plunger pump, the plunger pump includes plunger seat and installs the pump body in plunger seat, driving motor is installed at the one end of plunger seat, the other end of plunger seat to the oil tank, the hydro-cylinder is installed on the plunger seat, the plunger pump is connected with the driving motor transmission, oil circuit connection between oil tank, plunger pump and little piston, through inhaling oil access connection between oil tank and the piston, be provided with the oil absorption check valve on the oil absorption passageway, all oil circuits are all located in the plunger seat.

So set up, driving motor starts the back, drives the plunger pump and rotates to in sending into little piston through the oil circuit with the oil in the oil tank, little piston can drive the piston and stretch out in step, at the in-process that the piston stretches out, chamber formation negative pressure in the piston, thereby through the oil absorption passageway with oil suction piston in, form the compensation to the change of piston internal pressure.

More preferably: an annular mounting part is convexly arranged on the side wall of the pump body, at least one mounting cavity is arranged in the mounting part, a mounting opening is formed in the mounting cavity on the outer side wall of the mounting part, and a reset spring and a plunger piston are arranged in the mounting cavity; the outer side of the mounting part is eccentrically provided with an eccentric bearing, the eccentric bearing is mounted on a plunger seat, and the end part of the plunger is abutted against the inner side of the eccentric bearing; an oil inlet channel is arranged in the pump body, one end of the oil inlet channel is provided with an oil inlet on the end face of one end of the pump body, the other end of the oil inlet channel is communicated with all the installation cavities, and a first one-way valve is arranged at the communication position of the oil inlet channel and the installation cavities; the oil pump is characterized in that oil outlet channels with the same number as the mounting cavities are arranged in the pump body, one ends of the oil outlet channels are communicated with the mounting cavities, oil outlets are formed in the side walls of the pump body at the other ends of the oil outlet channels, and second one-way valves are arranged in the oil outlet channels.

So set up, through eccentric bearing and plunger cooperation for the pump body can drive eccentric bearing's inner circle when rotating and rotate, thereby effectively reduces the working resistance and the wearing and tearing of the pump body, and then can reduce its demand to drive power. In addition, with the setting of oil feed passageway and the passageway that produces oil inside the pump body, effectively reduce plunger pump's whole volume.

More preferably: the body on two sides of the mounting part is respectively provided with a first bearing and a second bearing; the plunger seat comprises a plunger seat main body and a sealing cover, wherein the plunger seat main body is provided with a jack for inserting the pump body, and the jack penetrates through the plunger seat main body; an embedded groove A for embedding the first bearing is arranged in the jack, a containing groove A is arranged outside the embedded groove A, and an embedding groove C for embedding the eccentric bearing is arranged outside the containing groove A; an embedding groove B for embedding the second bearing is formed in the sealing cover, and a containing groove B is formed in the outer side of the embedding groove B; plunger seat main part and closing cap are connected the back, the installation department is accomodate in accomodating groove A, is inlayed and establishes groove C and accomodate the cavity that groove B merges the formation in.

So set up, through the setting of first bearing and second bearing, can effectively reduce the pump body at the resistance of rotation in-process.

More preferably: inlay the oil pocket that the bottom of establishing groove B was provided with the diameter and is greater than the diameter of the inner circle of second bearing, be provided with the hydraulic fluid port with the oil pocket intercommunication on the closing cap, accomodate groove A, inlay the thickness of establishing groove C and accomodating the cavity that groove B merges and forms and be greater than the thickness of installation department, just the installation department both sides are provided with first butt portion and second butt portion respectively, the diameter of first butt portion is less than the outer lane internal diameter of first bearing, the diameter of second butt portion is less than the outer lane internal diameter of second bearing, accomodate groove A and accomodate the diameter of groove B and be greater than the eccentric bearing inner circle, be less than the outer lane of eccentric bearing.

So set up, oil gets into the oil pocket from the hydraulic fluid port, the plunger is seen off from the passageway of producing oil after inhaling the oil feed passageway in the course of the work, and simultaneously, the oil that gets into in the oil pocket can directly lubricate the second bearing, and through gap and installation department between the second bearing and accomodate groove B gap between lubricated eccentric bearing, lubricate the first bearing after the gap between groove B is accomodate to gap and installation department between eccentric bearing at last, thereby guarantee that the pump body can ensure to be in the low friction state in long-term use.

More preferably: and a connecting cavity coplanar with the oil outlet is arranged on the inner side wall of the jack, and an oil feeding channel is arranged between the connecting cavity and the small piston.

So set up, the connection chamber can ensure the pump body and rotate the in-process at a high speed, and the oil-out communicates with the external world all the time, can make its normal oil.

More preferably: a pressure relief oil return assembly is arranged on the path of the oil delivery channel and comprises a pressure relief valve arranged on the oil delivery channel, a mandril used for opening the pressure relief valve and a driving piece used for driving the mandril to move, a first inlet communicated with the oil absorption channel is arranged at one end of the pressure relief valve, and a first pressure relief one-way valve is arranged on the first inlet; a second inlet communicated with the oil feeding channel is formed in the side wall of the pressure release valve, a pressure release port is formed in the other end of the pressure release valve, and a second pressure release one-way valve is arranged on the pressure release port; the ejector rod is located outside the pressure relief opening, and the pressure relief opening is communicated with the oil tank through an oil return channel.

So set up, the plunger pump is at the during operation, and the pressure of fluid can be followed the inside intercommunication of second import and relief valve, leads to first pressure release check valve and second pressure release check valve all to be in the state of closing to normally send oil to little piston, when the piston produced the negative pressure and inhales oil in the oil tank simultaneously, also can guarantee that first pressure release check valve closes. When pressure is required to be relieved, the plunger pump stops running, the ejector rod is driven to move through the driving piece, the second one-way valve is pushed open, at the moment, the oil in the small piston can be sent back to the oil tank from the oil return channel through the second one-way valve, and in the process, the pressure in the piston can be larger than the pressure in the oil tank, so that the first one-way valve can be automatically opened, the oil in the piston can be sucked back to the oil tank, and the oil cylinder can be contracted.

More preferably: the diameter of the first inlet is larger than that of the pressure relief opening, and the first pressure relief check valve is a first pressure relief ball; the second pressure release valve comprises a second pressure release ball and a pressure release spring, the second pressure release ball is abutted to the pressure release spring arranged on the pressure release opening, the maximum diameter of the pressure release spring is smaller than that of the first inlet, and the diameter of the first pressure release ball is smaller than the inner diameter of the pressure release spring.

So set up, second pressure release check valve keeps closing under the pressure release spring effect, and first pressure release check valve then realizes opening and close control according to first pressure release ball both sides pressure variation.

More preferably: the outer side wall of the pressure release valve is provided with a concave ring communicated with the oil delivery channel, and the second inlet is formed in the concave ring.

So set up, the setting of concave ring can make the inside oil feed passageway intercommunication of relief valve, when the relief valve does not use, concave ring and second import can both regard as the oil circuit fuel feeding to pass through.

More preferably: the driving piece comprises a mounting frame, an eccentric rotating block and an operating arm, wherein the eccentric rotating block is rotatably connected to the mounting frame, the operating arm is fixed to the eccentric rotating block, and the ejector rod is controlled by a supporting spring to be supported and arranged on the eccentric rotating block.

So set up, rotate eccentric turning block through the operating arm and can promote the ejector pin compression and support and establish the spring and want the second pressure release check valve to remove, with second pressure release check valve opening, the operation is very simple and convenient.

More preferably: a pressure limiting channel is arranged between the oil feeding channel and the piston, and a pressure limiting valve for limiting oil in the piston to flow out is arranged at a connecting port between the pressure limiting channel and the piston.

So set up, at the initial stage of work, the pressure limiting valve is closed, the plunger pump is during all sending into little piston with fluid, make the quick packing of oil liquid in the little piston, thereby can make the piston produce the negative pressure fast, guarantee that the hydro-cylinder can produce very quick response when initial, later stage because the oil liquid is filled up the back in the little piston, under oil pressure and the inside negative pressure combined action of piston, the pressure limiting valve can be opened, the plunger pump is sent oil into in the piston, improve the later stage action speed of piston, thereby make the holistic stretching out speed of piston all comparatively fast.

In conclusion, the invention has the following beneficial effects:

1. the motor is adopted for driving, the oil cylinder is automatically controlled to extend out, and the use is time-saving and labor-saving;

2. the plunger pump with a specific structure is adopted to supply liquid, and the oil path design in the plunger seat is combined, so that the oil cylinder has extremely high response speed.

Drawings

FIG. 1 is a schematic structural view of the present embodiment;

FIG. 2 is a schematic view of an exploded structure of the present embodiment;

FIG. 3 is a schematic structural view of a plunger pump in the present embodiment;

FIG. 4 is a side cross-sectional view of the plunger pump of the present embodiment;

FIG. 5 is a schematic structural view of the pump body in the present embodiment;

FIG. 6 is a front view of the plunger pump of the present embodiment;

fig. 7 is a side sectional view of the plunger pump body in the present embodiment;

FIG. 8 is a schematic view showing a connecting structure of the cylinder and the plunger pump main body in the embodiment;

FIG. 9 is a first schematic structural view of a plunger pump body in the present embodiment, showing the structure of an oil feed passage;

FIG. 10 is a structural schematic view II of the plunger pump body in the present embodiment, showing the structure of the oil feed passage and the oil feed valve chamber;

FIG. 11 is a third schematic structural view of the plunger pump body in the present embodiment, showing the structure of the oil suction passage;

FIG. 12 is a schematic structural view of the oil suction check valve in the present embodiment;

fig. 13 is a partial sectional view of the present embodiment, showing the entire structure of the oil suction passage and the oil feed passage, and the relief valve;

FIG. 14 is a schematic structural view of a pressure limiting valve in the present embodiment;

fig. 15 is a sectional view of the relief valve in the present embodiment;

fig. 16 is a schematic structural diagram of the pressure release valve in the present embodiment;

fig. 17 is a schematic structural view of the closure in the present embodiment.

In the figure, 100, base; 200. an oil cylinder; 210. an oil cylinder sleeve; 220. a piston; 230. a small piston; 240. a track lifting wheel; 250. a deflector rod; 300. an oil tank; 400. a plunger pump; 410. a plunger seat; 411. a plunger seat body; 412. sealing the cover; 4121. embedding a groove B; 4122. a storage tank B; 4123. an oil chamber; 4124. an oil port; 4125. an oil supply passage; 4126. a communication through hole; 413. a jack; 4131. a shaft hole; 4132. embedding a groove A; 4133. embedding a groove C; 4134. a connecting cavity; 4135. a sealing groove; 4136. a seal ring; 414. connecting concave holes; 4141. a threaded connector; 4142. a communicating hole; 415. a detection channel; 4151. a socket; 416. an oil delivery channel; 4161. a vertical section; 4162. a horizontal segment; 4163. an oil inlet valve cavity; 4164. a pressure limiting valve; 4165. a pressure limiting channel; 417. a pressure relief valve cavity; 4171. an oil return passage; 418. an oil suction passage; 4181. an oil suction valve cavity; 4182. a connecting channel; 4183. a safety valve cavity; 4184. an oil discharge passage; 4185. a safety valve; 4186. a sealing cover; 420. a pump body; 421. an installation part; 4211. a mounting cavity; 422. an oil inlet channel; 4221. an oil inlet; 423. an oil outlet channel; 4231. an oil outlet; 424. a first check valve; 4241. a first valve hole; 4242. a first ball bearing; 4243. a blocking sheet; 425. a second one-way valve; 4251. a second valve hole; 4252. a second ball bearing; 4253. a compression spring; 4254. connecting a threaded hole; 4255. sealing the sieve; 4256. blocking the ball bearing; 430. a plunger; 440. a return spring; 500. a drive motor; 510. an oil pressure check meter; 610. an eccentric bearing; 620. a first bearing; 630. a second bearing; 700. a pressure relief valve; 710. a first pressure relief check valve; 720. a second inlet; 730. a pressure relief port; 740. a concave ring; 750. a second pressure relief check valve; 751. a second pressure relief ball; 752. a pressure relief valve core; 753. a pressure relief spring; 760. a first mounting groove; 770. a tool slot; 800. a drive member; 810. a mounting frame; 820. an eccentric rotating block; 830. an operating arm; 900. a top rod; 910. an annular projection; 920. and a second mounting groove.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

A hydraulic lane raising and pulling device is shown in fig. 1 and fig. 2 and comprises a base 100, an oil cylinder 200, an oil tank 300, a plunger pump 400, a driving motor 500 and a lane raising and pulling mechanism, wherein the plunger pump 400 is rotatably connected to the base 100, and the oil cylinder 200, the oil tank 300 and the driving motor 500 are fixedly mounted on the plunger pump 400. The track lifting and shifting mechanism comprises a lifting rod and a track lifting wheel, one end of the lifting rod is rotatably connected to the base 100, the other end of the lifting rod is rotatably connected with the end part of the oil cylinder 200, and the track lifting wheel is arranged on a connecting rotating shaft of the lifting rod and the oil cylinder 200.

As shown in fig. 3, the plunger pump 400 includes a plunger seat 410, a pump body 420 and a plunger 430, wherein the plunger seat 410 includes a plunger seat main body 411 and a cover 412, a plug hole 413 is provided on the plunger seat main body 411, the plug hole 413 penetrates through the plunger seat main body 411 to form a shaft hole 4131 (see fig. 4) on the back of the plunger seat main body 411, the cover 412 is fixedly mounted on an end face of the plunger seat main body 411 by bolts for blocking a large opening end of the plug hole 413, and the plug hole 413 is blocked by the cover 412 to form a mounting chamber for mounting the pump body 420.

Referring to fig. 2, the oil tank 300 is mounted on one end of the plunger holder body 411 to which the cap 412 is mounted, and the cap 412 is located inside the oil tank 300. The driving motor 500 is installed on an end surface of the opposite end of the oil tank 300, and an output shaft of the driving motor 500 is inserted into the shaft hole 4131 to be coupled with the pump body 420.

Referring to fig. 4 and 5, the pump body 420 has a cylindrical shape, a ring-shaped mounting portion 421 is provided on a side wall of the cylindrical shape in a protruding manner, and two mounting cavities 4211 are provided in the mounting portion 421, but not limited to two, and the two mounting cavities 4211 are equally spaced around an axial line of the pump body 420. The number of the plungers 430 is the same as that of the mounting cavities 4211, the mounting cavities 4211 are provided with mounting openings for mounting the plungers 430 on the outer side wall of the mounting portion 421, the mounting cavities 4211 are internally provided with return springs 440, one ends of the return springs 440 abut against the bottom of the mounting cavities 4211, and the other ends of the return springs 440 abut against the plungers 430.

An oil inlet channel 422 and an oil outlet channel 423 which are the same in number as the mounting cavities 4211 are arranged in the pump body 420, one end of the oil inlet channel 422 forms an oil inlet 4221 on one end face of the pump body 420, the other end of the oil inlet channel 422 is communicated with all the mounting cavities 4211, and a first check valve 424 is arranged at the communication position of the oil inlet channel 422 and the mounting cavities 4211. The first check valve 424 comprises a stepped first valve hole 4241 and a first ball 4242 arranged in the first valve hole 4241, one end of the first valve hole 4241 with a small diameter is communicated with the oil inlet channel 422, one end of the first valve hole 4241 with a large diameter is communicated with the installation cavity 4211 and coaxially arranged, a blocking piece 4243 is placed at the bottom of the installation cavity 4211, one end of the reset spring 440 is abutted to the blocking piece 4243, the other end of the reset spring is abutted to the plunger 430, and a waist-shaped hole is formed in the center of the blocking piece 4243.

One end of the oil outlet channel 423 is communicated with the mounting cavity 4211, an oil outlet 4231 is formed on the side wall of the pump body 420 at the other end, and a second one-way valve 425 is arranged in the oil outlet channel 423. The second check valve 425 includes a second valve hole 4251 having a diameter larger than that of the oil outlet passage 423, a second ball 4252 installed in the second valve hole 4251, and a compression spring 4253 for abutting the second ball 4252 at a connection port of the second valve hole 4251 and the oil outlet passage 423, and the oil outlet 4231 communicates with the second valve hole 4251. One end of the second valve hole 4251 far away from the oil outlet passage 423 penetrates through the pump body 420, a threaded connecting hole 4254 with the diameter larger than that of the second valve hole 4251 is arranged at the opening of the second valve hole 4251, a sealing screen 4255 is in threaded connection with the threaded connecting hole 4254, and a blocking ball 4256 abutting against the second valve hole 4251 is arranged in the threaded connecting hole 4254.

Referring to fig. 4 and 6, an eccentric bearing 610 is eccentrically provided outside the mounting portion 421, a first bearing 620 and a second bearing 630 are respectively mounted on the pump body 420 on both sides of the mounting portion 421, the eccentric bearing 610 is mounted in the insertion hole 413 of the plunger holder body 411, and an end portion of the plunger 430 abuts against the inside of the eccentric bearing 610.

Referring to fig. 4 and 7, an insertion groove a4132 for inserting the first bearing 620 is formed in the insertion hole 413, an accommodating groove a is formed outside the insertion groove a4132, and an insertion groove C4133 for inserting the eccentric bearing 610 is formed outside the accommodating groove a.

An embedding groove B4121 for embedding the second bearing 630 is arranged on the sealing cover 412, and a receiving groove B4122 is arranged outside the embedding groove B4121; after the plunger holder body 411 and the cover 412 are connected, the mounting portion 421 is received in a cavity formed by the combination of the receiving groove a, the fitting groove C4133, and the receiving groove B4122.

An oil cavity 4123 with a diameter larger than that of the inner ring of the second bearing 630 is arranged at the bottom end of the embedded groove B4121, an oil port 4124 (see fig. 3) communicated with the oil cavity 4123 is arranged on the sealing cover 412, the thickness of a cavity formed by combining the accommodating groove a, the embedded groove C4133 and the accommodating groove B4122 is larger than that of the mounting portion 421, a first abutting portion and a second abutting portion are respectively arranged on two sides of the mounting portion 421, the diameter of the first abutting portion is smaller than the inner diameter of the outer ring of the first bearing 620, the diameter of the second abutting portion is smaller than the inner diameter of the outer ring of the second bearing 630, and the diameters of the accommodating groove a and the accommodating groove B4122 are larger than that of the inner ring of the eccentric bearing 610 and smaller than that of the outer ring of the eccentric bearing 610.

Referring to fig. 2 and 3, a coupling recess hole 414 is formed in the plunger holder main body 411 below the cap 412, and the cylinder 200 is screwed to the coupling recess hole 414.

Referring to fig. 8, the cylinder 200 includes a cylinder casing 210, a piston 220, and a small piston 230, and the cylinder casing 210 is screw-coupled to the coupling recess 414. A raised threaded connector 4141 is arranged at the center of the connecting concave hole 414, the small piston 230 is in threaded connection with the threaded connector 4141, and the piston 220 is sleeved between the small piston 230 and the oil cylinder sleeve 210.

Referring to fig. 2 and 3, the mounting chamber communicates with the center of the bottom of the coupling recess 414 through an oil feed passage 416. Referring to fig. 4 and 7, a connection chamber 4134 disposed coplanar with the oil outlet 4231 is disposed on an inner sidewall of the shaft hole 4131, a sealing groove 4135 is disposed on both sides of the connection chamber 4134, and a sealing ring 4136 is installed in the sealing groove 4135.

A detection channel 415 communicated with the connection cavity 4134 is formed at the top end of the plunger seat main body 411, the opening of the detection channel 415 is sealed by a threaded plug, a socket 4151 is arranged on the end face of the plunger seat main body 411, which is opposite to the end face of the sealing cover 412, the bottom end of the socket 4151 is communicated with the detection channel 415, an oil pressure check meter 510 (refer to fig. 2) is arranged on the driving motor 500, and the oil pressure check meter is connected with the socket 4151 and used for detecting oil pressure in an oil path.

Referring to fig. 8 and 9, the oil feed passage 416 includes a vertical section 4161 and a horizontal section 4162, the vertical section 4161 extends upward through the plunger holder body 411, the open end is closed by a plug screw, and the vertical section 4161 and the side wall of the connecting chamber 4134 are tangential and communicate with each other at the tangential point. One end of the horizontal section 4162 extends outwards to penetrate through the plunger seat body 411, the open end is sealed by a threaded plug, and the lower end of the vertical section 4161 is communicated with the horizontal section 4162. A communication hole 4142 is provided at a center line of the screw connector 4141, and the communication hole 4142 communicates with an end of the horizontal section 4162.

Referring to fig. 8 and 10, an oil inlet valve cavity 4163 is provided at a position deviated from the center of the bottom of the connection recess 414, a pressure limiting valve 4164 is installed on the oil inlet valve cavity 4163, a pressure limiting passage 4165 is provided on the sidewall of the plunger seat main body 411, an opening of the pressure limiting passage 4165 is blocked by a threaded plug, and an end of the pressure limiting passage 4165 is communicated with the communication hole 4142. The pressure limiting valve 4164 is a check valve, so that oil can enter the piston 220 from the oil feeding passage 416 without the oil flowing backward in the piston 220.

Referring to fig. 9 and 10, a pressure relief valve cavity 417 is disposed on a side wall of the plunger seat main body 411, and the pressure relief valve cavity 417 is opened along a horizontal direction and is communicated with the vertical section 4161 in an intersecting manner. An oil return passage 4171 is formed in a side wall of the pressure relief valve cavity 417, and the other end of the oil return passage 4171 extends toward the end surface of the cover 412 and penetrates through the plunger seat body 411 and the cover 412.

Referring to fig. 11 and 13, an oil suction valve chamber 4181 is provided in the mounting chamber, and the oil suction valve chamber 4181 communicates with an off-center position of the bottom of the coupling recess 414 through an oil suction passage 418. An oil suction check valve is installed in the oil suction valve cavity 4181, and the structure of the oil suction check valve refers to fig. 12, which mainly aims to prevent oil in the oil suction passage 418 from flowing back into the installation cavity.

A connecting passage 4182 communicating with the oil suction passage 418 is provided at the bottom end of the pressure relief valve chamber 417. The upper end of the oil suction passage 418 penetrates the plunger seat body 411 upwards, a safety valve chamber 4183 is arranged at the opening formed by the penetration, an oil discharge passage 4184 is arranged on the side wall of the safety valve chamber 4183, and the other end of the oil discharge passage 4184 extends towards the end face of the seal cap 412 and penetrates the plunger seat body 411 and the seal cap 412.

A safety valve 4185 is installed in the safety valve chamber 4183, the structure of the safety valve 4185 is shown in fig. 14, and a sealing cover 4186 is screwed at the opening of the safety valve chamber 4183.

Referring to fig. 15 and 16, a pressure relief valve 700 is installed in a pressure relief valve cavity 417, a first inlet is disposed at one end of the pressure relief valve 700, the diameter of the first inlet is larger than that of the pressure relief port 730, a first pressure relief check valve 710 is disposed on the first inlet, and the first pressure relief check valve 710 is a first pressure relief ball. An external screw is arranged on the outer side wall of one end of the pressure release valve 700 provided with the first inlet, and the pressure release valve 700 is fixedly arranged in the pressure release valve cavity 417 through an external screw.

The outer side wall of the pressure relief valve 700 is provided with a concave ring 740, the side wall of the pressure relief valve 700 is provided with a second inlet 720, the second inlet 720 is arranged in the concave ring 740, one side of the concave ring 740, which is far away from the external thread, is provided with an annular first mounting groove 760, and a sealing ring 4136 is arranged in the first mounting groove 760.

The other end of the pressure relief valve 700 is provided with a pressure relief opening 730, a second pressure relief check valve 750 is arranged on the pressure relief opening 730, the second pressure relief valve 700 comprises a second pressure relief ball 751, a pressure relief valve core 752 and a pressure relief spring 753, the maximum diameter of the pressure relief spring 753 is smaller than the diameter of the first inlet, and the diameter of the first pressure relief ball is smaller than the inner diameter of the pressure relief spring 753. A pressure relief valve core 752 is arranged between the pressure relief spring 753 and the second pressure relief ball 751, one end of the pressure relief valve core 752 is provided with an insertion part with the diameter smaller than that of the pressure relief spring 753, the end face of the other end of the pressure relief valve core 752 is provided with a positioning recess, one end of the pressure relief spring 753 is abutted against the bottom wall of the pressure relief valve cavity 417, the other end of the pressure relief spring 753 is abutted against the pressure relief valve core 752, and the second pressure relief ball 751 is abutted against the pressure relief opening 730.

Wherein, the end face of the pressure release valve 700 provided with the pressure release opening 730 is provided with a straight tool groove 770.

A driving member 800 is fixedly installed at an opening of the pressure relief valve 700, a push rod 900 is arranged between the driving member 800 and the pressure relief valve 700, an annular protrusion 910 is arranged on a side wall between two ends of the push rod 900, an annular second installation groove 920 is arranged on the annular protrusion 910, and a sealing ring 4136 is installed in the second installation groove 920. A supporting spring is arranged between the mandril 900 and the pressure relief valve 700 and is in a compression state, and the opening of the oil return channel 4171 is positioned between the second mounting groove 920 and the pressure relief valve 700.

The driving member 800 includes a mounting bracket 810, an eccentric rotating block 820 rotatably connected to the mounting bracket 810, and an operating arm 830 fixed to the eccentric rotating block 820, wherein the mounting bracket 810 is fixedly mounted on the plunger seat body 411 by two bolts.

The pressure relief valve 700, the driving member 800 and the push rod 900 constitute a pressure relief oil return assembly.

As shown in fig. 17, the sealing cover 412 is provided with an oil supply channel 4125, one end of the oil supply channel 4125 is communicated with the oil chamber 4123, the other end of the oil supply channel 4125 forms the oil port 4124 at the bottom of the end surface of the sealing cover 412, one end of the oil supply channel 4125 communicated with the oil chamber 4123 upwards penetrates through the top of the sealing cover 412, an opening formed in the penetrating way is sealed through a threaded plug, a communication through hole 4126 is formed below the oil chamber 4123, and the communication through hole 4126 is communicated with the oil supply channel 4125.

The working principle is as follows:

when in work: the driving motor 500 is started to drive the pump body 420 to rotate, the plunger 430 moves on the inner side wall of the eccentric bearing 610 during the rotation of the pump body 420, due to the arrangement of an eccentric structure, the plunger 430 moves in the installation cavity 4211 during the rotation process, pressure change is formed in the installation cavity 4211, oil is sucked into the oil inlet channel 422 from the oil inlet 4221 under the action of the first check valve 424 and the second check valve 425, the oil is sent into the connecting cavity 4134 from the oil outlet 4231 through the oil outlet channel 423 and then enters the oil sending channel 416, and the oil is sent into the small piston 230 through the oil sending channel 416. After the oil is filled in the small piston 230, the piston 220 is driven to move, so that negative pressure is formed in the piston 220, the generated negative pressure can automatically open the oil suction one-way valve, and oil is sucked into the oil suction passage 418 from the oil chamber 4123 and then is sent into the piston 220. And after the oil liquid in the small piston 230 is filled to a certain degree, the pressure in the oil suction passage 418 is increased to open the pressure limiting valve 4164, so that the oil liquid is sent into the piston 220 through the pressure limiting passage 4165.

When pressure is required to be relieved, the manual operation operating arm 830 drives the eccentric rotating block 820 to rotate, and the push rod 900 is pushed inwards to open the second pressure relief one-way valve 750. At this time, the oil in the small piston 230 is sent from the oil suction passage 418 to the pressure relief valve 700, and finally sent back to the oil tank 300 from the oil return passage 4171. In the process, the pressure in the piston 220 is greater than the pressure in the relief valve 700, so that the first relief check valve 710 is automatically opened, and the oil in the piston 220 is sent to the relief valve 700 through the oil suction passage 418 and the connection passage 4182 and finally sent back to the oil tank 300.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. The utility model provides a hydraulic pressure plays lane ware, includes base (100), hydro-cylinder (200) and oil tank (300), hydro-cylinder (200) are including cylinder liner (210), piston (220) and little piston (230), characterized by: the oil-suction plunger pump is characterized by further comprising a plunger pump (400), wherein the plunger pump (400) comprises a plunger seat (410) and a pump body (420) installed in the plunger seat (410), the oil tank (300) is installed at one end of the plunger seat (410), the other end of the plunger seat (410) is provided with a driving motor (500), the oil cylinder (200) is installed on the plunger seat (410), the plunger pump (400) is in transmission connection with the driving motor (500), the oil tank (300), the plunger pump (400) and the small piston (230) are connected through oil passages, the oil tank (300) is connected with the piston (220) through an oil suction passage (418), the oil suction passage (418) is provided with an oil suction one-way valve, and all the oil passages are arranged in the plunger seat (410);

an annular mounting part (421) is convexly arranged on the side wall of the pump body (420), at least one mounting cavity (4211) is arranged in the mounting part (421), a mounting opening is formed in the mounting cavity (4211) on the outer side wall of the mounting part (421), and a return spring (440) and a plunger (430) are arranged in the mounting cavity (4211); an eccentric bearing (610) is eccentrically arranged on the outer side of the mounting part (421), the eccentric bearing (610) is mounted on the plunger seat (410), and the end part of the plunger (430) is abutted against the inner side of the eccentric bearing (610); an oil inlet channel (422) is arranged in the pump body (420), one end of the oil inlet channel (422) is provided with an oil inlet (4221) on the end face of one end of the pump body (420), the other end of the oil inlet channel is communicated with all the installation cavities (4211), and a first check valve (424) is arranged at the communication position of the oil inlet channel (422) and the installation cavities (4211); oil outlet channels (423) with the same number as the mounting cavities (4211) are arranged in the pump body (420), one end of each oil outlet channel (423) is communicated with the mounting cavity (4211), oil outlets (4231) are formed in the other end of each oil outlet channel on the side wall of the pump body (420), and a second one-way valve (425) is arranged in each oil outlet channel (423);

a first bearing (620) and a second bearing (630) are respectively arranged on the body at the two sides of the mounting part (421); the plunger seat (410) comprises a plunger seat main body (411) and a sealing cover (412), wherein an insertion hole (413) for inserting a pump body (420) is formed in the plunger seat main body (411), and the insertion hole (413) penetrates through the plunger seat main body (411); an embedded groove A (4132) for embedding the first bearing (620) is arranged in the insertion hole (413), a containing groove A is arranged on the outer side of the embedded groove A (4132), and an embedded groove C (4133) for embedding the eccentric bearing (610) is arranged on the outer side of the containing groove A; an embedding groove B (4121) for embedding the second bearing (630) is formed in the sealing cover (412), and a receiving groove B (4122) is formed in the outer side of the embedding groove B (4121); after the plunger seat main body (411) is connected with the sealing cover (412), the mounting part (421) is accommodated in a cavity formed by combining the accommodating groove A, the embedded groove C (4133) and the accommodating groove B (4122);

an oil cavity (4123) with the diameter larger than that of the inner ring of the second bearing (630) is arranged at the bottom end of the embedding groove B (4121), an oil port (4124) communicated with the oil cavity (4123) is formed in the seal cover (412), the thickness of a cavity formed by combining the accommodating groove A, the embedding groove C (4133) and the accommodating groove B (4122) is larger than that of the mounting portion (421), a first abutting portion and a second abutting portion are respectively arranged on two sides of the mounting portion (421), the diameter of the first abutting portion is smaller than the inner diameter of the outer ring of the first bearing (620), the diameter of the second abutting portion is smaller than that of the outer ring of the second bearing (630), and the diameters of the accommodating groove A and the accommodating groove B (4122) are larger than that of the inner ring of the eccentric bearing (610) and smaller than that of the outer ring of the eccentric bearing (610);

a connecting cavity (4134) coplanar with the oil outlet (4231) is formed in the inner side wall of the insertion hole (413), and an oil feeding channel (416) is arranged between the connecting cavity (4134) and the small piston (230);

a pressure relief oil return assembly is arranged on the path of the oil delivery channel (416), the pressure relief oil return assembly comprises a pressure relief valve (700) arranged on the oil delivery channel (416), a push rod (900) used for opening the pressure relief valve (700) and a driving piece (800) used for driving the push rod (900) to move, one end of the pressure relief valve (700) is provided with a first inlet communicated with the oil suction channel (418), and a first pressure relief one-way valve (710) is arranged on the first inlet; a second inlet (720) communicated with the oil feeding channel (416) is formed in the side wall of the pressure release valve (700), a pressure release port (730) is formed in the other end of the pressure release valve (700), and a second pressure release one-way valve (750) is arranged on the pressure release port (730); the ejector rod (900) is positioned outside the pressure relief port (730), and the pressure relief port (730) is communicated with the oil tank (300) through an oil return channel (4171);

the diameter of the first inlet is larger than that of the pressure relief opening (730), and the first pressure relief one-way valve (710) is a first pressure relief ball; the second pressure relief valve (700) comprises a second pressure relief ball (751) and a pressure relief spring (753) for abutting the second pressure relief ball (751) on the pressure relief opening (730), the maximum diameter of the pressure relief spring (753) is smaller than the diameter of the first inlet, and the diameter of the first pressure relief ball is smaller than the inner diameter of the pressure relief spring (753).

2. The hydraulic track raising and pulling device as claimed in claim 1, wherein: the outer side wall of the pressure relief valve (700) is provided with a concave ring (740) communicated with the oil delivery channel (416), and the second inlet (720) is arranged in the concave ring (740).

3. The hydraulic track raising and pulling device as claimed in claim 1, wherein: the driving piece (800) comprises a mounting frame (810), an eccentric rotating block (820) rotatably connected to the mounting frame (810), and an operating arm (830) fixed to the eccentric rotating block (820), and the ejector rod (900) is controlled by an abutting spring to abut against the eccentric rotating block (820).

4. The hydraulic track raising and pulling device as claimed in claim 1, wherein: a pressure limiting channel (4165) is arranged between the oil feeding channel (416) and the piston (220), and a pressure limiting valve (4164) for limiting the outflow of oil in the piston (220) is arranged at a connecting port between the pressure limiting channel (4165) and the piston (220).