Portable mobile electro-hydraulic jacking device

Abstract

This invention relates to the field of mechanical jacking technology, specifically to a portable, mobile electro-hydraulic jacking device, comprising a mobile base, a jacking cylinder, a telescopic cylinder, and a hydraulic assembly; the telescopic cylinder is slidably mounted on the mobile base; there are two jacking cylinders, located on both sides of the telescopic cylinder, capable of extending and retracting in the vertical direction; the telescopic cylinder includes a cylinder barrel, a cover, two piston rods, and two sliding sleeves; by hinged connection between the jacking cylinder and the piston rod of the telescopic cylinder, and by pre-setting a gap between the sliding sleeve of the telescopic cylinder and its corresponding jacking cylinder, when the telescopic cylinder extends, the jacking cylinder can tilt at a certain angle relative to the vertical direction and abut against the sliding sleeve on the same side; when the jacking cylinder extends to contact the ground, due to its hinged connection with the telescopic cylinder, it will automatically fine-tune the tilt angle according to the unevenness of the ground. Compared with the rigid connection method in the prior art, it can better adapt to complex ground environments and improve the stability and safety of jacking operations.

Description

Technical Field

[0001] This invention relates to the field of mechanical lifting technology, and more specifically to a portable, mobile electro-hydraulic lifting device. Background Technology

[0002] After performing tasks or training, vehicles require regular maintenance. Tasks such as chassis inspection, tire replacement, and road wheel repair all necessitate lifting the vehicle to a certain height to facilitate access for maintenance personnel. Existing vehicle lifting structures typically include jacks, lifts, and hydraulic lifting systems. These structures are designed to raise the vehicle to a suitable height for maintenance or parts replacement. However, different vehicle models have varying wheelbases. To accommodate these differences, current technology often mounts multiple lifting cylinders on a telescopic mechanism, using its extension and retraction to fit different wheelbases. However, in actual vehicle maintenance scenarios, the ground is often uneven. Traditional lifting devices often have fixed connections or simple rigid hinges between the lifting cylinders and the telescopic mechanism, failing to automatically adjust the cylinder tilt angle based on ground conditions. This results in insufficient contact between the device and the ground or the vehicle during lifting, leading to swaying or even overturning, severely impacting operational stability and safety. Summary of the Invention

[0003] This invention provides a portable, mobile electro-hydraulic lifting device to solve the problem that existing lifting devices often have insufficient contact with the ground or workpieces such as vehicles during the lifting process, which affects the stability of the operation.

[0004] The portable, mobile electro-hydraulic lifting device of the present invention adopts the following technical solution: A portable, mobile electro-hydraulic lifting device includes a mobile base, lifting cylinders, telescopic cylinders, and a hydraulic assembly. The telescopic cylinders are slidably mounted on the mobile base and can extend and retract along a first direction, which is a horizontal direction perpendicular to the forward direction of the mobile base. There are two lifting cylinders, located on either side of the telescopic cylinders along the first direction, and they can extend and retract vertically. The telescopic cylinder includes a cylinder barrel, a cover, two piston rods, and two sliding sleeves. Two independent control oil chambers are distributed within the cylinder barrel along the first direction. The piston rods are arranged along the first direction, and one end of each piston rod is sealed and slidably mounted on a control sleeve. The oil chamber is connected at one end to a lifting cylinder by a hinge axis perpendicular to the first direction and horizontal. The cover is fitted outside the cylinder and fixedly connected to the cylinder, and slides vertically with the movable base. Each sliding sleeve is located between the cylinder and the cover and slides with both the cylinder and the cover. Each sliding sleeve connects a piston rod to the hinge axis of the lifting cylinder and has a preset gap between it and the corresponding lifting cylinder. This allows the lifting cylinder to rotate around the hinge axis within a preset range when the piston rod extends out of the oil chamber and moves the lifting cylinder horizontally. The hydraulic assembly is used to supply or extract oil to the control oil chamber, thereby controlling the extension and retraction of the piston rod.

[0005] Optionally, each lifting cylinder is rotatably mounted with a support plate, and the rotation of the support plate changes the support area of ​​the lifting cylinder.

[0006] Optionally, the pallet is provided with support pads, and the surface of the support pads is provided with anti-slip texture.

[0007] Optionally, the lifting cylinder includes a cylinder body and a piston rod, the upper end of the piston rod is slidably sealed to the cylinder body, and the lower end extends out of the cylinder body to support the ground; the cylinder body and the piston rod of the telescopic cylinder are hinged through the hinge shaft; the cylinder body is filled with hydraulic oil, and the hydraulic assembly controls the extension and retraction of the lifting cylinder by supplying or withdrawing oil into the cylinder body.

[0008] Optionally, the lifting cylinder is provided with a support mechanism, which includes a support cylinder and a support plate. The support cylinder is installed on the cylinder body, and the support plate is rotatably installed on the support cylinder through a ball joint block. A portion of the ball joint block is located inside the support cylinder and is in contact with the support cylinder through a spherical surface. The support plate is fixedly connected to the portion of the ball joint block located outside the support cylinder and is coplanar with the side of the ball joint block away from the support cylinder.

[0009] Optionally, the support cylinder and the cylinder body of the lifting cylinder are in a sealed sliding fit, and the sliding direction is consistent with the extension and retraction direction of the piston rod, and an elastic element is provided between the support cylinder and the cylinder body; a buffer oil chamber is provided between the support cylinder and the cylinder body, and an oil outlet communicating with the buffer oil chamber is provided on the support cylinder, and a flow meter and a control valve are provided at the oil outlet; a support plate is installed above the support cylinder to support the workpiece; after the lifting cylinder extends to the point where the support plate abuts against the workpiece, it squeezes the oil in the buffer oil chamber to flow out from the oil outlet. When the flow meter detects that the oil output reaches the preset range, the control valve closes to prevent the buffer oil chamber from being further compressed, thereby preventing the support cylinder and the cylinder body from sliding relative to each other further.

[0010] Optionally, a hollow groove is formed in the center of the support plate, and a cavity communicating with the hollow groove is formed in the ball joint block. A sealing block that is fixedly connected to the support plate and is coplanar is installed in the hollow groove. The sealing block has multiple needle outlet holes. A top block is slidably installed in the cavity, and multiple needles are provided on the side of the top block near the sealing block. An adjustment component is also provided in the support cylinder. The adjustment component adjusts the position of the top block according to the inclination of the support plate, thereby adjusting the length of the needles extending from the needle outlet holes, and making the extension length of the needles positively correlated with the inclination of the support plate.

[0011] Optionally, the adjustment assembly includes a positioning block, a pull rope, and a piston cylinder; the piston cylinder is slidably installed in the cavity and sealed and separated from the top block by a partition cylinder fixed in the cavity, the piston cylinder is located outside the top block and has an opening at the bottom; the positioning block is installed in the support cylinder and located below the piston cylinder and is connected to the piston cylinder by a pull rope, and hydraulic oil is filled between the bottom of the top block and the side wall of the cavity; the support plate tilts and drives the ball joint block to rotate, thereby causing the piston cylinder to move downward under the tension of the pull rope, increasing the volume of the piston cylinder entering the hydraulic oil, and then pushing the top block upward through the hydraulic oil, thereby causing the ejector pin to extend or tend to extend.

[0012] Optionally, an angle sensor is provided on the back of the support plate to monitor the tilt angle and degree of tilt of the support plate; two clamping plates are provided inside the support cylinder, one of which is fixed and the other can move up and down; the positioning block is spherical and located in the spherical space defined between the two clamping plates; the two clamping plates approach each other to increase their clamping force on the positioning block, thereby adjusting the degree of rotation of the positioning block under the tension of the pull rope.

[0013] Optionally, the movable clamping plate slides and seals with the support cylinder, and a sealing oil cavity is provided between the clamping plate and the support cylinder. The clamping plate is moved by injecting or pumping oil into the sealing oil cavity.

[0014] The beneficial effects of this invention are as follows: The portable and mobile electro-hydraulic lifting device of this invention hinges the piston rod of the lifting cylinder and the telescopic cylinder, and reserves a preset gap between the sliding sleeve of the telescopic cylinder and its corresponding lifting cylinder. When the telescopic cylinder extends, the lifting cylinder can tilt at a certain angle relative to the vertical direction and abut against the sliding sleeve on the same side. When the lifting cylinder extends to contact the ground, due to its hinge with the telescopic cylinder, it will automatically adjust the tilt angle according to the unevenness of the ground. Compared with the rigid connection method in the prior art, it can better adapt to complex ground environments and improve the stability and safety of lifting operations.

[0015] Furthermore, by incorporating a buffer oil chamber in conjunction with a flow meter, flexible buffering is achieved when the support plate contacts the workpiece. This ensures that the support plate rotates to full contact with the workpiece before rigid support, preventing damage to the workpiece or equipment from sudden impact. Moreover, when the lifting positions of the two lifting cylinders are inconsistent, the buffer oil chamber allows the flow meter's monitored oil volume to serve as a trigger signal for valve closure. When the flow meters of both support mechanisms reach preset values, the control valves of both mechanisms close simultaneously. Afterward, the two lifting cylinders can synchronously lift upwards after the support plate is fully in contact with the workpiece, preventing workpiece tilting and ensuring the stability of the lifting process.

[0016] Furthermore, the adjustment component adjusts the position of the top block, thereby adjusting the extension length of the ejector pins. When the support plate is tilted at a large degree, multiple ejector pins extend out of the pin holes and make multiple contacts with the workpiece, which can increase the friction with the workpiece surface and prevent slippage during lifting. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the portable, mobile electro-hydraulic lifting device of the present invention; Figure 2 This is a schematic diagram of the telescopic cylinder and the lifting cylinder in an embodiment of the portable mobile electro-hydraulic lifting device of the present invention; Figure 3 for Figure 2 A diagram illustrating the breakdown; Figure 4 for Figure 2 Side view; Figure 5 for Figure 4Schematic diagram of cross section along the AA direction; Figure 6 This is a schematic diagram of the lifting cylinder and support mechanism in another embodiment of the portable and mobile electro-hydraulic lifting device of the present invention; Figure 7 for Figure 6 The front view; Figure 8 for Figure 7 A cross-sectional view along the CC direction; Figure 9 for Figure 8 Enlarged view of point X in the middle; Figure 10 This is a partial structural breakdown diagram of the support mechanism in another embodiment of the portable, mobile electro-hydraulic lifting device of the present invention; Figure 11 This is a schematic diagram showing the adjustment assembly and other components in another embodiment of the portable, mobile electro-hydraulic lifting device of the present invention.

[0019] In the diagram: 100, movable base; 110, movable handle; 200, lifting cylinder; 210, cylinder body; 220, piston rod; 230, support plate; 300, telescopic cylinder; 310, cylinder barrel; 320, cover; 330, piston rod; 340, sliding sleeve; 400, hydraulic assembly; 500, support mechanism; 510, support cylinder; 511, elastic element; 513, clamping plate; 514, buffer oil chamber; 515, sealing oil chamber; 516, support seat; 520, support plate; 521, angle sensor; 522, sealing block; 530, ball joint block; 540, top block; 541, ejector pin; 542, spring; 551, positioning block; 552, pull rope; 553, piston cylinder; 554, separator cylinder. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Embodiments of the portable, mobile electro-hydraulic lifting device of the present invention, such as... Figures 1 to 11 As shown, it includes a movable base 100, a lifting cylinder 200, a telescopic cylinder 300, and a hydraulic assembly 400.

[0022] The mobile base 100 is equipped with multiple wheels on its underside and a handle 110 on one side, making it easy for operators to move the entire device.

[0023] The telescopic cylinder 300 is slidably mounted on the movable base 100 and can extend and retract along a first direction, which is a horizontal direction perpendicular to the forward direction of the movable base 100.

[0024] There are two lifting cylinders 200, located on both sides of the telescopic cylinder 300 in the first direction, which can extend and retract in the vertical direction.

[0025] The telescopic cylinder 300 includes a cylinder barrel 310, a cover 320, two piston rods 330, and two sliding sleeves 340. Two independent control oil chambers are distributed within the cylinder barrel 310 along a first direction. The piston rods 330 are arranged along the first direction, with one end of each piston rod 330 slidably and sealed within one control oil chamber, and the other end hinged to a lifting cylinder 200 about a hinge axis perpendicular to the first direction and horizontal. The cover 320 is sleeved outside the cylinder barrel 310 and fixedly connected to it, and slides vertically with the movable base 100. Each sliding sleeve 340 is located between the cylinder barrel 310 and the cover 320 and is flush with the cylinder barrel 310. The cover 320 is slidably fitted, and each sliding sleeve 340 connects a piston rod 330 to the hinge shaft of the lifting cylinder 200, and a preset gap is reserved between the sliding sleeve 340 and the corresponding lifting cylinder 200. This allows the lifting cylinder 200 to rotate around the hinge shaft within a preset range when the piston rod 330 extends out of the oil chamber and drives the lifting cylinder 200 to move horizontally. Specifically, the part of the sliding sleeve 340 located below the piston rod 330 has a preset gap with the lifting cylinder 200. When the piston rod 330 extends, the lifting cylinder 200 can tilt to its lower side at most to abut against the sliding sleeve 340, without affecting the contact between the lifting cylinder 200 and the ground.

[0026] The hydraulic assembly 400 is used to supply or extract oil to the control oil chamber, thereby controlling the extension and retraction of the piston rod 330. Specifically, the hydraulic assembly 400 is integrally mounted on the movable base 100 and includes a hydraulic station, a hydraulic circuit distribution module, an electronically controlled valve group, and a synchronization control module. The hydraulic station includes a hydraulic oil tank and a hydraulic oil pump. The oil inlet of the hydraulic oil pump is connected to the hydraulic oil tank through an oil inlet pipe, and the oil outlet is connected to the electronically controlled valve group through an oil outlet pipe. The hydraulic circuit distribution module includes two sets of first inlet and return oil circuits connected to the rod chamber and rodless chamber of the two lifting cylinders 200, respectively, and a second inlet and return oil circuit connected to the rod chamber and rodless chamber of the control oil chamber of the telescopic cylinder 300. The electronically controlled valve group includes a main inlet solenoid directional valve, an inlet solenoid valve for the lifting cylinder 200, an inlet solenoid valve for the telescopic cylinder 300, and hydraulic locks installed on each oil circuit. The synchronization control module includes flow divider and combiner valves (synchronization valves) installed on the two sets of first inlet and return oil lines. These valves distribute the oil output from the hydraulic pump equally to the two lifting cylinders 200, enabling the two lifting cylinders 200 to extend and retract synchronously. The structure and function of the hydraulic assembly 400 are existing technologies and will only be briefly described here. The specific structure and control logic will not be described in detail.

[0027] In actual operation, in the initial state, the lifting cylinder 200 is suspended in the air. By pushing the movable base 100, the entire device is moved to the area below the vehicle or other workpiece to be lifted. Then, the extension cylinder 300 is controlled by the hydraulic assembly 400 to send the two lifting cylinders 200 to the appropriate position. Specifically, the hydraulic assembly 400 controls the inlet solenoid valve of the extension cylinder 300 and the hydraulic lock in the second inlet and return oil circuit, so that hydraulic oil enters from the rodless chamber of each control oil chamber and flows out from the rod chamber, thereby causing the piston rod 330 to extend from the control oil chamber and the extension cylinder 300 to extend. When the telescopic cylinder 300 extends, because the piston rod 330 is hinged to the lifting cylinder 200, the lifting cylinder 200 can tilt at a certain angle relative to the vertical direction and abut against the sliding sleeve 340 on the same side. After the telescopic cylinder 300 extends to a suitable length, the hydraulic assembly 400 locks the length of the telescopic cylinder 300. Then, the hydraulic assembly 400 controls the extension of the lifting cylinder 200 by controlling the oil inlet solenoid valve of the lifting cylinder 200 and the hydraulic lock in the first oil inlet and return circuit. When the lifting cylinder 200 extends to contact the ground, because it is hinged to the telescopic cylinder 300, it will automatically adjust the tilt angle according to the unevenness of the ground. Compared with the rigid connection method in the prior art, it can better adapt to complex ground environment and improve the stability and safety of lifting operation.

[0028] In this embodiment, the mobile base 100 is also equipped with an electronic remote control receiver, which can remotely control the hydraulic assembly 400 to realize the extension and retraction of the telescopic cylinder 300 and the lifting cylinder 200. Its specific structure and function are also existing technologies and will not be described in detail.

[0029] In this embodiment, a support plate 230 is rotatably mounted on each lifting cylinder 200, and the rotation of the support plate 230 changes the support area of ​​the lifting cylinder 200. The support plate 230 is provided with a support pad (not shown in the figure), and the surface of the support pad has anti-slip textures to increase friction during lifting and prevent workpiece slippage.

[0030] In this embodiment, the lifting cylinder 200 includes a cylinder body 210 and a piston rod 220. The upper end of the piston rod 220 is slidably sealed to the cylinder body 210, and the lower end extends out of the cylinder body 210 to support the ground. The cylinder body 210 and the piston rod 330 of the telescopic cylinder 300 are hinged through the hinge shaft. The cylinder body 210 is filled with hydraulic oil, and the hydraulic assembly 400 controls the extension and retraction of the lifting cylinder 200 by supplying or extracting oil into the cylinder body 210.

[0031] In some other embodiments, a support mechanism 500 is provided on the lifting cylinder 200. The support mechanism 500 includes a support cylinder 510 and a support plate 520. The support cylinder 510 is installed on the cylinder body 210, and the support plate 520 is rotatably installed on the support cylinder 510 via a ball joint block 530. A portion of the ball joint block 530 is located inside the support cylinder 510 and is in spherical contact with a support seat 516 fixedly installed inside the support cylinder 510. The portion of the support plate 520 and the portion of the ball joint block 530 located outside the support cylinder 510 are fixedly connected and are coplanar with the side of the ball joint block 530 away from the support cylinder 510. The size of the portion of the ball joint block 530 inside the support cylinder 510 is larger than the size of the portion outside the support cylinder 510 to prevent the ball joint block 530 from detaching from the support cylinder 510. The ball joint connection between the support plate 520 and the support cylinder 510 allows the support plate 520 to adapt to workpiece surfaces with different inclinations, increasing the contact area and improving stability during lifting.

[0032] In this embodiment, the support cylinder 510 is in a sealed sliding fit with the cylinder body 210 of the lifting cylinder 200, and the sliding direction is consistent with the extension and retraction direction of the piston column 220. An elastic element 511 is provided between the support cylinder 510 and the cylinder body 210. A buffer oil chamber 514 is provided between the support cylinder 510 and the cylinder body 210, and an oil outlet communicating with the buffer oil chamber 514 is provided on the support cylinder 510. A flow meter and a control valve are provided at the oil outlet. The support plate 520 is installed above the support cylinder 510 to support the workpiece. After the lifting cylinder 200 extends to the point where the support plate 520 abuts against the workpiece, it squeezes the oil in the buffer oil chamber 514 to flow out from the oil outlet. When the flow meter detects that the oil output reaches a preset value, the control valve closes to prevent the buffer oil chamber 514 from being further compressed, thereby preventing the support cylinder 510 and the cylinder body 210 from sliding relative to each other further. By configuring a buffer oil chamber 514 in conjunction with a flow meter, flexible buffering is achieved when the support plate 520 contacts the workpiece. This ensures that the support plate 520 rotates to full contact with the workpiece before rigid support, preventing damage to the workpiece or equipment from sudden impact. When the lifting positions of the two lifting cylinders 200 are inconsistent, the lifting cylinder 200 corresponding to the support plate 520 that is already in contact with the workpiece will continue to extend, causing one side of the workpiece to be lifted, leading to workpiece tilting. By configuring the buffer oil chamber 514, the oil volume value monitored by the flow meter can be used as a trigger signal to close the control valve. When the oil volume values ​​monitored by the flow meters of both support mechanisms 500 reach the preset value, the control valves of both support mechanisms 500 close simultaneously. Afterward, the two lifting cylinders 200 can lift upward synchronously after the support plate 520 is fully in contact with the workpiece, preventing workpiece tilting and ensuring the stability of the lifting process. The initial volume of the buffer oil chamber 514 is limited, which can accommodate a small range of differences in the height of the workpiece lifting positions, meeting the needs of most conventional working conditions.

[0033] In this embodiment, a hollow groove is formed in the center of the support plate 520, and a cavity communicating with the hollow groove is formed in the ball joint block 530. A sealing block 522, which is fixedly connected to the support plate 520 and is coplanar, is installed in the hollow groove. The sealing block 522 has multiple needle holes. A top block 540 is slidably installed in the cavity. Multiple needles 541 are provided on the side of the top block 540 near the sealing block 522. A spring 542 is provided between the top block 540 and the sealing block 522. The spring 542 causes the needles 541 on the top block 540 to retract into the needle holes. An adjustment component is also provided in the support cylinder 510. The adjustment component adjusts the position of the top block 540 according to the inclination of the support plate 520, thereby adjusting the length of the needles 541 extending from the needle holes, and making the extension length of the needles 541 positively correlated with the inclination of the support plate 520. The adjustment assembly adjusts the position of the top block 540, thereby adjusting the extension length of the ejector pins 541. When the support plate 520 is tilted at a large angle, multiple ejector pins 541 extend from their holes and make multi-point contact with the workpiece, increasing the friction with the workpiece surface and preventing slippage during lifting. Specifically, when the ejector pins 541 penetrate the workpiece surface, a "ploughing effect" is created. In the well-known "adhesion-ploughing theory," friction is explicitly defined as the sum of two independent components: total friction = adhesive friction + ploughing friction. When the ejector pins 541 make multi-point contact with the workpiece, the workpiece surface has already undergone slight deformation due to the penetration of the ejector pins 541. At this point, the ploughing friction dominates. If slippage occurs, it is no longer just a matter of overcoming surface friction, but also overcoming the shear strength and yield strength of the material. Therefore, the total friction is greater at this time. Similar applications include spiked shoes and automotive snow chains in existing technologies. Among them, the length of the ejector pin 541 extending out of the pin hole is relatively small, and during the actual lifting process, the weight of the workpiece will hinder the extension of the ejector pin 541. Therefore, the tendency of the ejector pin 541 to extend will be transformed into the lifting pressure on the workpiece, thereby increasing the friction between the ejector pin and the workpiece, without affecting the contact between the support plate 520 and the workpiece.

[0034] In this embodiment, the adjustment assembly includes a positioning block 551, a pull rope 552, and a piston cylinder 553. The piston cylinder 553 is slidably installed in the cavity and is sealed and separated from the top block 540 by a partition cylinder 554 fixed in the cavity. The piston cylinder 553 is located outside the top block 540 and has an opening at its bottom. The positioning block 551 is installed inside the support cylinder 510 and is located below the piston cylinder 553 and is connected to the piston cylinder 553 by the pull rope 552. Hydraulic oil is filled between the bottom of the top block 540 and the side wall of the cavity. The support plate 520 tilts and drives the ball joint block 530 to rotate, thereby causing the piston cylinder 553 to move downward under the tension of the pull rope 552, increasing the volume of the piston cylinder 553 entering the hydraulic oil, thereby causing the hydraulic oil to flow upward through the opening and push the top block 540, thereby causing the ejector pin 541 to extend or tend to extend. When the contact position between the workpiece and the support plate 520 is an inclined plane, the support plate 520 and the workpiece are in contact and tilted, which in turn drives the ball joint block 530 to rotate. The piston cylinder 553 installed in the ball joint block 530 tilts synchronously, causing its angle with the pull rope 552 to change. The pull force of the pull rope 552 on the piston cylinder 553 generates a vertical downward component force, which drives the piston cylinder 553 to move down and squeeze the hydraulic oil to push the top block 540, causing the ejector pin 541 to extend.

[0035] In this embodiment, an angle sensor 521 is provided on the back of the support plate 520 to monitor the tilt angle and degree of tilt of the support plate 520. Two clamping plates 513 are provided inside the support cylinder 510, one of which is fixed, while the other can move up and down. The positioning block 551 is spherical and located within the spherical space defined between the two clamping plates 513. The two clamping plates 513 approaching each other increases their clamping force on the positioning block 551, thereby adjusting the degree of rotation of the positioning block 551 under the tension of the pull rope 552. Specifically, the greater the clamping force of the two clamping plates 513 on the positioning block 551, the less likely the positioning block 551 is to rotate. When the ball joint block 530 causes the piston cylinder 553 to tilt, the angle between the pull rope 552 and the piston cylinder 553 changes more, the piston cylinder 553 moves down a greater distance, and the extension length of the ejector pin 541 increases accordingly. Conversely, the smaller the clamping force of the two clamping plates 513 on the positioning block 551, the easier it is for the positioning block 551 to rotate. When the ball joint block 530 drives the piston cylinder 553 to tilt, the pull rope 552 drives the positioning block 551 to rotate synchronously. The smaller the change in the angle between the pull rope 552 and the piston cylinder 553, the smaller the downward distance of the piston cylinder 553, and the corresponding reduction in the extension length of the ejector pin 541. When the tilt angles of the support plates 520 above the two lifting cylinders 200 are opposite, there is no need to adjust the clamping degree of the positioning block 551. The support plates 520 tilted at opposite angles can generate opposite pushing forces on the workpiece, keeping the workpiece in balance. When the tilt angles of the support plates 520 above the two lifting cylinders 200 are the same, it is necessary to clamp the positioning block 551 with the two clamping plates 513 to restrict its rotation, thereby increasing the extension length or extension force of the ejector pin 541 and preventing the workpiece from slipping along the tilt direction of the support plate 520. In some other embodiments, the positions of the positioning block 551 and the clamping plate 513 can also be locked, and the angle sensor 521 is not required, thus simplifying the structure.

[0036] In this embodiment, the movable clamping plate 513 is slidably sealed with the support cylinder 510, and a sealing oil cavity 515 is provided between the clamping plate 513 and the support cylinder 510. The clamping plate 513 is moved by injecting or extracting oil into the sealing oil cavity 515. Specifically, in order to reduce the impact of the movement of the clamping plate 513 on the pull rope 552, the two clamping plates 513 are respectively located on the upper and lower sides of the positioning block 551, and the clamping plate 513 located above is fixed. The pull rope 552 passes through the clamping plate 513 located above and connects to the positioning block 551. The clamping plate 513 located below can move up and down. The sealing oil cavity 515 is located below it. By injecting oil, it is pushed upward to clamp the positioning block 551.

[0037] When using the portable, movable electro-hydraulic lifting device of the present invention, the entire device is moved under the vehicle or other workpiece to be lifted by pushing the movable base 100. Then, the extension cylinder 300 is controlled by the hydraulic assembly 400 to send the two lifting cylinders 200 to the appropriate position. After that, the length of the extension cylinder 300 is locked, and the hydraulic assembly 400 controls the extension of the lifting cylinder 200. The piston column 220 of the lifting cylinder 200 first contacts the ground. While the piston column 220 contacts the ground, the angle of the lifting cylinder 200 is adjusted to make it perpendicular to the ground. The lifting cylinder 200 continues to extend until the support plate 230 above it or the support plate 520 of the support mechanism 500 abuts against the workpiece. Then the workpiece is lifted to facilitate subsequent operations.

[0038] If the pallet 230 is used to contact the workpiece, the pallet 230 is rotated to a suitable position before the lifting cylinder 200 extends, in order to meet the lifting requirements of different workpieces.

[0039] If the support mechanism 500 is used to contact the workpiece, when the lifting cylinder 200 extends, the support plate 520 is pushed to fit against the lower surface of the workpiece, and the support plate 520 is rotated to the same tilt angle as the lower surface of the workpiece. The support plate 520 drives the ball joint block 530 to rotate synchronously, causing the piston cylinder 553 installed in the ball joint block 530 to tilt synchronously, changing the angle between it and the pull rope 552. The pull rope 552 exerts a vertical downward force on the piston cylinder 553, causing the piston cylinder 553 to move down and squeeze the hydraulic oil to push the top block 540, causing the ejector pin 541 to extend. When the lifting positions of the two lifting cylinders 200 are not at the same height, the support plate 520 above the lower lifting cylinder 200 contacts the workpiece first, and the oil in its buffer oil chamber 514 flows out first. The support plate 520 above the higher lifting cylinder 200 contacts the workpiece later, and the oil in its buffer oil chamber 514 flows out later. Two flow meters monitor the amount of oil flowing out of the two buffer oil chambers 514 respectively. When the amount of oil flowing out reaches the preset value, the control valves of the two support mechanisms 500 are triggered to close simultaneously. At this time, the support plate 520 is completely in contact with the workpiece, and the two lifting cylinders 200 can continue to extend to lift the workpiece synchronously.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A portable, mobile electro-hydraulic jacking device, characterized in that, Includes a movable base, lifting cylinder, telescopic cylinder, and hydraulic assembly; The telescopic cylinder is slidably mounted on the movable base and can extend and retract along a first direction, which is a horizontal direction perpendicular to the forward direction of the movable base. There are two lifting cylinders, located on both sides of the telescopic cylinder in the first direction, which can extend and retract in the vertical direction; The telescopic cylinder includes a cylinder barrel, a cover, two piston rods, and two sliding sleeves. Two independent control oil chambers are distributed within the cylinder barrel along a first direction. The piston rods are arranged along the first direction, with one end of each piston rod slidably and sealed within a control oil chamber, and the other end hinged to a lifting cylinder around a hinge axis perpendicular to the first direction and horizontal. The cover is fitted outside the cylinder barrel and fixedly connected to it, and slides vertically with the movable base. Each sliding sleeve is located between the cylinder barrel and the cover and slides with both. Each sliding sleeve connects a piston rod to the hinge axis of the lifting cylinder, and a preset gap is reserved between the sleeve and the corresponding lifting cylinder, allowing the lifting cylinder to rotate within a preset range around the hinge axis when the piston rod extends out of the oil chamber and drives the lifting cylinder to translate. The hydraulic assembly is used to supply or extract oil to the control oil chamber, thereby controlling the extension and retraction of the piston rod; The lifting cylinder is equipped with a support mechanism, which includes a support cylinder and a support plate. The support cylinder is installed on the cylinder body, and the support plate is rotatably installed on the support cylinder through a ball joint block. A part of the ball joint block is located inside the support cylinder and is in contact with the support cylinder through a spherical surface. The support plate is fixedly connected to the part of the ball joint block located outside the support cylinder and is coplanar with the side of the ball joint block away from the support cylinder. A hollow groove is formed in the center of the support plate, and a cavity communicating with the hollow groove is formed in the ball joint block. A sealing block that is fixedly connected to the support plate and is coplanar is installed in the hollow groove. The sealing block has multiple needle outlet holes. A top block is slidably installed in the cavity, and multiple needles are set on the side of the top block near the sealing block. An adjustment component is also provided in the support cylinder. The adjustment component adjusts the position of the top block according to the inclination of the support plate, thereby adjusting the length of the needles extending from the needle outlet holes, and making the extension length of the needles positively correlated with the inclination of the support plate.

2. The portable, mobile electro-hydraulic lifting device according to claim 1, characterized in that, Each lifting cylinder is rotatably mounted with a support plate, and the rotation of the support plate changes the support area of ​​the lifting cylinder.

3. The portable, mobile electro-hydraulic lifting device according to claim 2, characterized in that, The pallet is equipped with support pads, and the surface of the support pads has anti-slip texture.

4. The portable, mobile electro-hydraulic lifting device according to claim 1, characterized in that, The lifting cylinder includes a cylinder body and a piston rod. The upper end of the piston rod is slidably sealed to the cylinder body, and the lower end extends out of the cylinder body to support the ground. The cylinder body and the piston rod of the telescopic cylinder are hinged through the hinge shaft. The cylinder body is filled with hydraulic oil, and the hydraulic assembly controls the extension and retraction of the lifting cylinder by supplying or withdrawing oil into the cylinder body.

5. The portable, mobile electro-hydraulic lifting device according to claim 4, characterized in that, The support cylinder and the cylinder body of the lifting cylinder are in a sealed sliding fit, and the sliding direction is consistent with the extension and retraction direction of the piston column. An elastic element is provided between the support cylinder and the cylinder body. A buffer oil chamber is provided between the support cylinder and the cylinder body, and an oil outlet communicating with the buffer oil chamber is provided on the support cylinder. A flow meter and a control valve are provided at the oil outlet. A support plate is installed above the support cylinder to support the workpiece. After the lifting cylinder extends to the point where the support plate abuts against the workpiece, it squeezes the oil in the buffer oil chamber to flow out from the oil outlet. When the flow meter detects that the oil output reaches the preset range, the control valve closes to prevent the buffer oil chamber from being further compressed, thereby preventing the support cylinder and the cylinder body from sliding relative to each other further.

6. The portable, mobile electro-hydraulic lifting device according to claim 5, characterized in that, The adjustment assembly includes a positioning block, a pull rope, and a piston cylinder. The piston cylinder is slidably installed in the cavity and sealed and separated from the top block by a partition cylinder fixed in the cavity. The piston cylinder is located outside the top block and has an opening at its bottom. The positioning block is installed inside the support cylinder and located below the piston cylinder and is connected to the piston cylinder by a pull rope. Hydraulic oil is filled between the bottom of the top block and the side wall of the cavity. The inclined support plate drives the ball joint block to rotate, thereby causing the piston cylinder to move downward under the tension of the pull rope, increasing the volume of the piston cylinder entering the hydraulic oil. This, in turn, pushes the top block upward through the hydraulic oil, causing the ejector pin to extend or tend to extend.

7. The portable, mobile electro-hydraulic lifting device according to claim 6, characterized in that, An angle sensor is installed on the back of the support plate to monitor the tilt angle and degree of tilt of the support plate; two clamping plates are installed inside the support cylinder, one of which is fixed and the other can move up and down; the positioning block is spherical and located in the spherical space defined between the two clamping plates; the two clamping plates can increase their clamping force on the positioning block when they are close to each other, thereby adjusting the degree of rotation of the positioning block under the tension of the pull rope.

8. The portable, mobile electro-hydraulic lifting device according to claim 7, characterized in that, The movable clamping plate slides and seals with the support cylinder, and a sealing oil cavity is provided between the clamping plate and the support cylinder. The clamping plate is driven to move by injecting or pumping oil into the sealing oil cavity.

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