CN214990123U - Pedal type lifting device - Google Patents

Abstract

The utility model discloses a foot-operated lifting device, which comprises a supporting component and a lifting device, wherein the supporting component comprises a base; two lifting components connected to the base; the hydraulic lifting device comprises a working hydraulic driving assembly, a lifting assembly and a hydraulic box, wherein the working hydraulic driving assembly comprises a workbench which is connected to the upper end of the lifting assembly and is horizontally arranged, a cylinder body seat is fixedly connected onto the workbench, a hydraulic box and an upper hydraulic cylinder with an upper rodless cavity are connected onto the upper side of the cylinder body seat, an upper piston rod which extends upwards and can make reciprocating linear movement in the height direction is connected onto the upper hydraulic cylinder, a limiting ring is fixed at the upper end of the upper piston rod, a reset spring is sleeved on the upper piston rod, the upper end and the lower end of the reset spring are respectively abutted against the lower side of the limiting ring and the cylinder body seat, the hydraulic box is provided with a high-pressure cavity and a low-pressure cavity which are mutually independent, a high-pressure port communicated with the high-pressure cavity is formed in the bottom of the hydraulic box, an oil outlet which is communicated with the upper rodless cavity and can be communicated with the high-pressure cavity is formed in the bottom of the upper hydraulic cylinder, and the hydraulic box provides driving force for the lifting assembly through the high-pressure port; the utility model discloses the structure is reliable, convenient operation.

Description

Pedal type lifting device

Technical Field

The utility model relates to a jacking equipment technical field, especially a foot-operated elevating gear.

Background

The hydraulic lifting platform is widely applied to the current national economy as an aerial work platform, such as aerial work and maintenance of factories, automatic warehouses, parking lots, municipal facilities, wharfs, buildings, gardens, decoration, logistics, electric power, traffic, petroleum, chemical industry, hotels, gymnasiums, industrial mines, enterprises and the like.

In the prior art, a utility model with the name of "hand-operated lifting device", the publication number is CN 210419092U, the publication number is 2020.04.28, the device comprises a base, a hydraulic cylinder and a plurality of lifting components, the top of the uppermost lifting component is connected with a horizontally arranged working platform, between the adjacent lifting components, the top of the lower lifting component is hinged with the bottom of the upper lifting component, the bottom side of the base is fixedly connected with a connecting frame, the cylinder body of the hydraulic cylinder is hinged with the connecting frame, the hydraulic cylinder comprises a piston and a plunger, the piston is the power input end of the hydraulic cylinder, the connecting frame is rotatably connected with a rotating rod, one end of the rotating rod is rotatably connected with a driving rod, one end of the driving rod, which is far away from the rotating rod, is hinged with one end of the piston, one end of the piston is the end which extends out of the cylinder body of the hydraulic cylinder, the other end of the rotating rod is connected with a hand-operated rod which extends out of the base, the telescopic rod is connected in the hand-operated rod in a sliding way, the piston can drive the plunger to extend out, the end part of the plunger is connected with the lifting component at the lowest part, when the lifting platform works, a worker standing on the working platform slides out the telescopic rod from the hand-operated rod and slides out the telescopic rod from the hand-operated rod, when the telescopic rod extends to the position where the top part of the telescopic rod can be reached when the worker stands on the working platform, the action of the telescopic rod is stopped, the telescopic rod is manually operated to enable the telescopic rod to swing leftwards, the telescopic rod drives the hand-operated rod to swing leftwards, the swing of the hand-operated rod drives the rotating rod to rotate anticlockwise, the rotating rod drives the driving rod to swing leftwards, the driving rod drives the piston rod to continuously retract, under the pushing action of the piston rod, the plunger continuously inclines and upwards extends out, the plunger drives the lifting component to ascend, the lifting component drives the working platform to ascend, in the design, the working platform can not be lifted while working, the operation is inconvenient.

SUMMERY OF THE UTILITY MODEL

This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and in the abstract of the specification and the title of the application to avoid obscuring the purpose of this section, the abstract of the specification and the title of the application, and such simplifications or omissions are not intended to limit the scope of the invention.

The present invention has been made in view of the above and/or other problems occurring in the conventional lifting device.

Therefore, the utility model aims at providing a foot-operated elevating gear, its structure is reliable, convenient operation.

In order to solve the technical problem, the utility model provides a following technical scheme: a foot-operated lifting device, which comprises a lifting device,

a support assembly including a base;

the two lifting assemblies are arranged at intervals in the front-rear direction, and the lower ends of the lifting assemblies are connected to the base;

the working hydraulic driving assembly comprises a workbench, wherein the upper end of the lifting assembly is horizontally arranged, a cylinder body seat is fixedly connected onto the workbench, a hydraulic box with a high-pressure cavity and an upper hydraulic cylinder with an upper rodless cavity are connected to the upper side of the cylinder body seat, an upper piston rod which upwards stretches out and can move in a reciprocating linear mode in the height direction is connected onto the upper hydraulic cylinder, a high-pressure opening is formed in the bottom of the hydraulic box, an oil outlet which is communicated with the upper rodless cavity and can be communicated with the high-pressure cavity is formed in the bottom of the upper hydraulic cylinder, and driving force is provided for the lifting assembly through the high-pressure opening after hydraulic oil in the high-pressure cavity flows out.

As an optimized scheme of foot-operated elevating gear, wherein: a limiting ring is fixed at the upper end of the upper piston rod, a return spring is sleeved on the upper piston rod, the upper end of the return spring abuts against the lower side of the limiting ring, and the lower end of the return spring abuts against the cylinder body seat.

As an optimized scheme of foot-operated elevating gear, wherein: the outside of the hydraulic tank is hinged with a pedal plate, a lower pressing shaft is connected to the pedal plate above the limiting ring, the lower pressing shaft can act on the upper end of the limiting ring, one end, far away from the hydraulic tank, of the pedal plate is connected with a connecting rod, and one end, far away from the pedal plate, of the connecting rod is connected with a pedal rod convenient to tread.

As an optimized scheme of foot-operated elevating gear, wherein: the cylinder body seat is provided with a first mounting cavity and a second mounting cavity which are mutually independent, a first check valve is mounted in the first mounting cavity of the cylinder body seat, a second check valve is mounted in the second mounting cavity of the cylinder body seat, the bottom of the hydraulic tank is provided with a liquid inlet which is communicated with the high-pressure cavity, high-pressure oil discharged from the upper rodless cavity can be sequentially discharged into the high-pressure cavity through the first check valve and the liquid inlet, the bottom of the hydraulic tank is provided with a low-pressure liquid port communicated with the low-pressure cavity, and low-pressure oil in the low-pressure cavity can be sequentially sucked into the rodless cavity through the second check valve and the oil outlet.

As an optimized scheme of foot-operated elevating gear, wherein: the upper part of the hydraulic tank is connected with a stop valve, and the stop valve regulates and controls the on-off of the high-pressure cavity and the low-pressure cavity.

As an optimized scheme of foot-operated elevating gear, wherein: the lifting assembly comprises a first lower lifting rod and a second lower lifting rod, the centers of the first lower lifting rod and the second lower lifting rod are hinged together, the lower end of the first lower lifting rod is hinged with the base, the lower end of the second lower lifting rod is movably connected to the base, the upper end of the first lower lifting rod is hinged with a first upper lifting rod, the upper end of the second lower lifting rod is hinged with a second upper lifting rod, the centers of the first upper lifting rod and the second upper lifting rod are hinged together, the upper end of the first upper lifting rod is hinged to the lower side of the workbench, the second upper lifting rod is movably connected to the lower side of the workbench, a lower connecting shaft is connected between the two second lower lifting rods arranged at a front-back interval, a lower hydraulic cylinder with a lower rodless cavity is hinged to the lower connecting shaft, an oil pipe communicated with the lower rodless cavity is connected to the lower hydraulic cylinder, the upper end of the oil pipe is connected to a high-pressure port of the cylinder base, and an upper connecting shaft is connected between two ends of the two lower lifting rods extending upwards, and a lower piston rod is connected to the lower hydraulic cylinder, and one end of the lower piston rod, which extends upwards, is hinged to the upper connecting shaft.

As an optimized scheme of foot-operated elevating gear, wherein: at least three fixed ears are arranged on the base, the fixed ears are rotatably connected with supporting arms, one end of each supporting arm extending outwards is in threaded connection with a supporting shaft, and the lower portion of each supporting shaft is connected with a supporting seat.

As an optimized scheme of foot-operated elevating gear, wherein: and a rotating handle is connected to the supporting shaft above the supporting arm.

As an optimized scheme of foot-operated elevating gear, wherein: the supporting seat is provided with at least one connecting hole.

As an optimized scheme of foot-operated elevating gear, wherein: the front end and the rear end of the lower connecting shaft are both rotationally connected with moving wheels, and the base is provided with sliding grooves which facilitate the rolling of the moving wheels.

The utility model has the advantages that: the utility model discloses the structure is reliable, only needs to trample the promotion action that the foot rest lever can accomplish the workstation alone on the workstation, when needing to descend the workstation, rotates the stop valve, can accomplish the automatic decline of workstation, convenient operation.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor. Wherein:

fig. 1 is a front view of the present invention.

Fig. 2 is a first perspective view of the present invention.

Fig. 3 is a second perspective view of the present invention.

Fig. 4 is a partially enlarged view of a portion a in fig. 3.

Fig. 5 is a structural diagram of the middle cylinder block, the upper hydraulic cylinder and the hydraulic tank of the present invention connected together.

Fig. 6 is a view from the direction B-B in fig. 5.

Fig. 7 is a view from direction C-C in fig. 5.

Fig. 8 is a structural diagram of the lifting of the driving workbench of the utility model.

Fig. 9 is a partial enlarged view of fig. 3 at D.

Wherein, 100 supporting components, 101 base, 101-1 sliding groove, 102 roller, 103 lower rodless cavity, 104 connecting hole, 105 supporting seat, 106 supporting shaft, 107 rotating handle, 108 supporting arm, 200 lifting component, 201 lower lifting rod I, 202 lower lifting rod II, 203 upper lifting rod II, 204 upper lifting rod I, 205 lower piston rod, 206 lower hydraulic cylinder, 207 lower connecting shaft, 208 oil pipe, 209 upper connecting shaft, 210 moving wheel, 300 working hydraulic driving component, 301 workbench, 302 cylinder base, 303 hydraulic tank, 303-1 connecting part, 304 pedal rod, 305 connecting rod, 306 pedal, 307 lower pressing shaft, 308 spacing ring, 309 return spring, 310 upper hydraulic cylinder, 311 upper piston rod, 312 mounting cavity I, 313 one-way valve I, 314 through 318, 315 mounting cavity II, 316 one-way valve II, 317 oil outlet, low pressure liquid port, 319 high pressure port, 320 high pressure cavity, 322 low pressure chamber, 323 stop valve, 323-1 knob, 324 rodless chamber.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying the present invention are described in detail below with reference to the accompanying drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be implemented in other ways different from the specific details set forth herein, and one skilled in the art may similarly generalize the present invention without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

Furthermore, the references herein to "one embodiment" or "an embodiment" refer to a particular feature, structure, or characteristic that may be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

Example 1

Referring to fig. 1, 2 and 4-8, for the first embodiment of the present invention, this embodiment provides a foot-operated lifting device, which is convenient for the operation of high-altitude operation and reduces the labor intensity.

The foot-operated lifting device comprises a supporting component 100, wherein two lifting components 200 which are arranged at intervals in the front-rear direction are connected to the supporting component 100, the lower end of each lifting component 200 is connected to a base 101, and the upper end of each lifting component 200 is connected with a working hydraulic driving component 300 which is used for supporting workers and driving each lifting component 200 to lift;

the supporting assembly 100 comprises a base 101, and the lifting assembly 200 is connected to the base 101;

the working hydraulic driving assembly 300 comprises a workbench 301 which is connected to the upper end of the lifting assembly 200 and is horizontally arranged, a cylinder body base 302 is fixedly connected to the workbench 301, a hydraulic tank 303 is connected to the upper side of the cylinder body base 302, a connecting part 303-1 is arranged at the lower part of the hydraulic tank 303, the connecting part 303-1 is connected to the upper side of the cylinder body base 302, an upper hydraulic cylinder 310 with an upper rodless cavity 324 is connected to the connecting part 303-1, an upper piston rod 311 which extends upwards and can do reciprocating linear movement in the height direction is connected to the upper hydraulic cylinder 310, a limiting ring 308 is fixed at the upper end of the upper piston rod 311, a return spring 309 is sleeved on the upper piston rod 311, the upper end of the return spring 309 abuts against the lower side of the limiting ring 308, the lower end of the return spring 309 abuts against the cylinder body base 302, the hydraulic tank 303 is provided with a high pressure cavity 321 and a low pressure cavity 322 which are mutually independent, a high pressure port 318 which is communicated with the high pressure cavity 321 is opened on the connecting part 303-1, the bottom of the upper hydraulic cylinder 310 is provided with an oil outlet 317 which is communicated with the upper rodless chamber 324 and can be communicated with the high-pressure chamber 321, and the hydraulic tank 303 provides driving force for the lifting assembly 200 through a high-pressure port 318.

Further, the outside of the hydraulic tank 303 is hinged with a pedal 306, the pedal 306 above the limit ring 308 is connected with a lower pressing shaft 307, the lower pressing shaft 307 can act on the upper end of the limit ring 308, one end of the pedal 306 far away from the hydraulic tank 303 is connected with a connecting rod 305, and one end of the connecting rod 305 far away from the pedal 306 is connected with a pedal lever 304 which is convenient to tread.

Further, a first check valve 313 and a second check valve 316 are connected to the cylinder body base 302, a first mounting cavity 312 and a second mounting cavity 315 which are independent of each other are formed when the connecting portion 303-1 is connected to the upper side of the cylinder body base 302, the first check valve 313 and the second check valve 316 are respectively mounted in the first mounting cavity 312 and the second mounting cavity 315, a liquid inlet 320 is formed in the bottom of the hydraulic tank 303, the liquid inlet 320 is communicated with the high-pressure cavity 321, high-pressure oil discharged from the upper rodless cavity 324 can be sequentially discharged into the high-pressure cavity 321 through the first check valve 313 and the liquid inlet 320, a low-pressure liquid port 318 communicated with the low-pressure cavity 322 is formed in the connecting portion, a liquid through groove 314 is formed in the cylinder body base 302, one end of the liquid through groove 314 is communicated with the low-pressure liquid port 318, the other end of the liquid through groove 314 is respectively communicated with the first mounting cavity 312 and the second mounting cavity 315, and low-pressure oil in the low-pressure cavity 322 can be sequentially sucked into the upper rodless cavity 324 through the second check valve 316 and the oil outlet 317.

Further, the upper part of the hydraulic tank 303 is connected with a stop valve 323, the outer end of the stop valve 323 is connected with a knob 323-1, and the stop valve 323 regulates the on-off of the high-pressure cavity 321 and the low-pressure cavity 322.

Further, the lifting assembly comprises a lower lifting rod I201 and a lower lifting rod II 202, the centers of the lower lifting rod I201 and the lower lifting rod II 202 are hinged together, the lower end of the lower lifting rod I201 is hinged with the base 101, the lower end of the lower lifting rod II 202 is movably connected to the base 101, the upper end of the lower lifting rod I201 is hinged with an upper lifting rod I204, the upper end of the lower lifting rod II 202 is hinged with an upper lifting rod II 203, the centers of the upper lifting rod I204 and the upper lifting rod II 203 are hinged together, the upper end of the upper lifting rod I204 is hinged to the lower side of the workbench 301, the upper lifting rod II 203 is movably connected to the lower side of the workbench 301, a lower connecting shaft 207 is connected between the two lower lifting rod II 202 arranged at a front-back interval, the front end and the rear end of the lower connecting shaft 207 are both rotatably connected with a movable wheel 210, a sliding groove 101-1 convenient for the movable wheel 210 to roll is formed in the base 101, a lower hydraulic cylinder 206 with a lower rodless cavity 103 is hinged on the lower connecting shaft 207, an oil pipe 208 communicated with the lower rodless cavity 103 is connected to the lower hydraulic cylinder 206, an oil discharge port corresponding to the high-pressure port 318 is formed in the workbench 301, the upper end of the oil pipe 208 is connected to the high-pressure port 318 of the cylinder body base 302 through the oil discharge port, an upper connecting shaft 209 is connected between the two upward extending ends of the lower lifting rod II 202, the front end and the rear end of the upper connecting shaft 209 are respectively connected with a rotatable moving wheel 210, a sliding groove 101-1 facilitating the moving wheel 210 to roll is formed in the base 101, a lower piston rod 205 is connected to the lower hydraulic cylinder 206, and the upward extending end of the lower piston rod 205 is hinged to the upper connecting shaft 209.

In the utility model, the first check valve 313 and the second check valve 316 are prior art, and the embodiment only shows the schematic diagram, four rollers 102 are arranged on the lower side of the base 101, a person stands on the workbench 301 to load and unload goods, the stop valve 323 separates the high-pressure cavity 321 and the low-pressure cavity 322 in the initial state, and the bottom of the support seat 105 is higher than the bottom of the rollers 102; the base 101 is moved to a required position, when the workbench 301 needs to be lifted, a foot steps on the foot lever 304, the foot lever 304 drives the connecting rod 305 to rotate downwards, the connecting rod 305 drives the pedal plate 306 to swing downwards, the lower pressing shaft 307 on the pedal plate 306 presses the limiting ring 308 downwards, the piston rod presses downwards, the reset spring 309 compresses, hydraulic oil in the upper rodless cavity 324 compresses, the hydraulic oil is discharged from the oil outlet 317 under the action of pressure to open the one-way valve one 313, high-pressure oil discharged from the one-way valve one 313 enters the high-pressure cavity 321 through the liquid inlet 320, and then reaches the lower rodless cavity 103 from the oil outlet 317 through the oil pipe 208, the lower piston rod 205 is pushed to extend upwards to release pressure energy, the workbench 301 is lifted upwards, and the upper hydraulic cylinder 310 completes oil pressing; when the pedal lever 304 is released, the upper hydraulic cylinder 310 is under the action of the return spring 309, the upper piston rod 311 is lifted in a return stroke, so that the volume of an upper rodless cavity 324 of the upper hydraulic cylinder 310 is increased, the pressure is reduced, and vacuum is generated, low-pressure oil in a low-pressure cavity 322 of the hydraulic tank 303 is discharged from a low-pressure oil port 318 under the action of pressure difference, a second check valve 316 is opened, the low-pressure oil is sucked into the upper rodless cavity 324 of the upper hydraulic cylinder 310, and an oil suction process is completed, so that the upper piston rod 311 is continuously pressed, the oil is continuously sucked, and finally the lower piston rod 205 is continuously extended, so that the workbench 301 is continuously lifted; when the workbench 301 is lifted to the right position, after high-altitude operation is completed, the knob 323-1 at the outer end of the stop valve 323 is rotated, the stop valve 323 moves outwards, the high-pressure cavity 321 is communicated with the low-pressure cavity 322, the knob 323-1 is stopped to rotate, pressure oil in the high-pressure cavity 321 enters the low-pressure cavity 322 to complete pressure relief, and at the moment, the lower piston rod 205 automatically returns under the action of gravity of heavy objects carried on the workbench 301 and the platform, namely, the platform slowly and automatically descends and resets; when the position of the workbench 301 needs to be adjusted again, the rotating handle 107 is rotated reversely, the supporting seat 105 is enabled to leave the ground, the supporting arm 108 is rotated reversely, and the supporting arm 108 is enabled to be retracted; the utility model has reliable structure, can finish the lifting action of the workbench 301 by only stepping on the pedal rod 304 on the workbench 301 by one person, can finish the automatic descending of the workbench 301 by rotating the knob 323-1 when the workbench 301 is required to descend, and has convenient operation; can be applied to the work of the lifting workbench 301.

Example 2

Referring to fig. 3 and 9, a second embodiment of the present invention is different from the previous embodiment in that: the utility model discloses a supporting component 100 is still including arranging at least three fixed ear on base 101, and in this embodiment, four fixed ears of having arranged on base 101 rotationally are connected with support arm 108 on the fixed ear, and the one end threaded connection that support arm 108 outwards stretched out has back shaft 106, and the sub-unit connection of back shaft 106 has supporting seat 105.

Further, a turning handle 107 is connected to the support shaft 106 above the support arm 108.

Further, the support base 105 is provided with at least one connection hole 104.

When the support base 105 is mounted on the support shaft 106, the support base 105 is coupled to the lower portion of the support shaft 106 through the coupling hole 104 by a fastening member such as a fastening screw, thereby facilitating replacement of the support base 105.

When the base 101 is moved to a desired position, the supporting arm 108 is rotated to expand the supporting arm 108, the rotating handle 107 is rotated, the supporting shaft 106 is rotated, the rotating direction of the rotating handle 107 is adjusted to move the supporting shaft 106 downward, the supporting seat 105 is lowered to abut against the ground, the rotating handle 107 is stopped from rotating, and the supporting component 100 is fixed.

It should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.

Claims (10)

1. A foot-operated elevating gear which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,

a support assembly (100) comprising a base (101);

the lifting assemblies (200) are arranged, the two lifting assemblies (200) are arranged at intervals in the front-rear direction, and the lower ends of the lifting assemblies (200) are connected to the base (101);

the working hydraulic driving assembly (300) comprises a workbench (301) connected to the upper end of the lifting assembly (200) and horizontally arranged, a cylinder body seat (302) is fixedly connected to the workbench (301), a hydraulic tank (303) with a high-pressure cavity (321) and an upper hydraulic cylinder (310) with an upper rodless cavity (324) are connected to the upper side of the cylinder body seat (302), an upper piston rod (311) which extends upwards and can reciprocate linearly in the height direction is connected to the upper hydraulic cylinder (310), a high-pressure port (319) is formed in the bottom of the hydraulic tank (303), an oil outlet (317) which is communicated with the upper rodless cavity (324) and can be communicated with the high-pressure cavity (321) is formed in the bottom of the upper hydraulic cylinder (310), and driving force is provided for the lifting assembly (200) through the high-pressure port (319) after hydraulic oil in the high-pressure cavity (321) flows out.

2. The foot-operated lifting device according to claim 1, wherein: a limiting ring (308) is fixed at the upper end of the upper piston rod (311), a return spring (309) is sleeved on the upper piston rod (311), the upper end of the return spring (309) abuts against the lower side of the limiting ring (308), and the lower end of the return spring (309) abuts against the cylinder body seat (302).

3. The foot-operated lifting device according to claim 2, wherein: the outer side of the hydraulic tank (303) is hinged with a pedal (306), a lower pressing shaft (307) is connected to the pedal (306) above the limiting ring (308), the lower pressing shaft (307) can act on the upper end of the limiting ring (308), one end, away from the hydraulic tank (303), of the pedal (306) is connected with a connecting rod (305), and one end, away from the pedal (306), of the connecting rod (305) is connected with a pedal rod (304) which is convenient to tread.

4. The foot-operated lifting device according to claim 3, wherein: the hydraulic tank (303) is also internally provided with a low-pressure cavity (322) which can be communicated with or isolated from the high-pressure cavity (321), the cylinder body seat (302) is provided with a first mounting cavity (312) and a second mounting cavity (315) which are mutually independent, the first mounting cavity (312) of the cylinder body seat (302) is internally provided with a first check valve (313), the second mounting cavity (315) of the cylinder body seat (302) is internally provided with a second check valve (316), the bottom of the hydraulic tank (303) is provided with a liquid inlet (320), the liquid inlet (320) is communicated with a high-pressure cavity (321), high-pressure oil discharged from an upper rodless cavity 324 can be sequentially discharged into the high-pressure cavity (321) through a one-way valve I (313) and the liquid inlet (320), the bottom of the hydraulic tank (303) is provided with a low-pressure liquid port (318) communicated with a low-pressure cavity (322), and low-pressure oil in the low-pressure cavity (322) can be sequentially sucked into the rodless cavity through a one-way valve II (316) and an oil outlet (317).

5. The foot-operated lifting device according to claim 4, wherein: the upper part of the hydraulic tank (303) is connected with a stop valve (323), and the stop valve (323) regulates and controls the on-off of the high-pressure cavity (321) and the low-pressure cavity (322).

6. The foot-operated lifting device according to claim 5, wherein: the lifting assembly (200) comprises a first lower lifting rod (201) and a second lower lifting rod (202), the centers of the first lower lifting rod (201) and the second lower lifting rod (202) are hinged together, the lower end of the first lower lifting rod (201) is hinged with the base (101), the lower end of the second lower lifting rod (202) is movably connected to the base (101), the upper end of the first lower lifting rod (201) is hinged with a first upper lifting rod (204), the upper end of the second lower lifting rod (202) is hinged with a second upper lifting rod (203), the centers of the first upper lifting rod (204) and the second upper lifting rod (203) are hinged together, the upper end of the first upper lifting rod (204) is hinged to the lower side of the workbench (301), the second upper lifting rod (203) is movably connected to the lower side of the workbench (301), a lower connecting shaft (207) is connected between the two second lower lifting rods (202) arranged at intervals in the front and back, and a lower connecting shaft (207) is hinged with a lower hydraulic cylinder (206) with a lower rodless cavity (103), an oil pipe (208) communicated with the lower rodless cavity (103) is connected to the lower hydraulic cylinder (206), the upper end of the oil pipe (208) is connected to a high-pressure port (319) of the cylinder body seat (302), an upper connecting shaft (209) is connected between the two upward extending ends of the lower lifting rod II (202), a lower piston rod (205) is connected to the lower hydraulic cylinder (206), and the upward extending end of the lower piston rod (205) is hinged to the upper connecting shaft (209).

7. The foot-operated lifting device according to claim 6, wherein: at least three fixed ears are arranged on the base (101), the fixed ears are rotatably connected with supporting arms (108), one end of each supporting arm (108) extending outwards is in threaded connection with a supporting shaft (106), and the lower portion of each supporting shaft (106) is connected with a supporting seat (105).

8. The foot-operated lifting device according to claim 7, wherein: a rotating handle (107) is connected to the supporting shaft (106) above the supporting arm (108).

9. The foot-operated lifting device according to claim 8, wherein: the supporting seat (105) is provided with at least one connecting hole (104).

10. The foot-operated lifting device according to claim 9, wherein: the front end and the rear end of the lower connecting shaft (207) are both rotatably connected with a movable wheel (210), and the base (101) is provided with a sliding groove (101-1) which is convenient for the movable wheel (210) to roll.

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