CN221253740U - Manual double-station jack - Google Patents

Abstract

The application discloses a manual double-station jack, which relates to the technical field of jacks and comprises a base, an oil tank shell, a jack main oil cylinder assembly arranged in the oil tank shell, a large plunger oil pumping mechanism and a small plunger oil pumping mechanism which are all arranged on the base and can work independently, wherein the oil tank shell and the jack main oil cylinder assembly are connected with the base, an oil tank is formed between the oil tank shell and the jack main oil cylinder assembly, and an oil inlet channel used for communicating the oil tank and the plunger oil pumping mechanism, an oil supply channel used for communicating an oil cylinder barrel and the two plunger oil pumping mechanisms and an oil return channel used for communicating the oil cylinder barrel and the oil tank are arranged in the base. The application can solve the problems of low lifting efficiency during no-load, large operating moment of manual oil pumping during heavy load and the like, and has the characteristics of safe use, convenient maintenance and the like.

Description

Manual double-station jack

Technical Field

The application relates to the technical field of jacks, in particular to a manual double-station jack.

Background

With the rapid development of the transportation automobile industry, the jack products of maintenance tools are very frequently used in daily life, and various types of the jack products are used, so that the old manual vertical jack has only one lifting speed in the use process, namely the lifting speed of an empty load is the same as that of a heavy load, the lifting efficiency is low in the empty load, time is wasted in use, in order to overcome the problems, a device for lifting the piston pair and a device for using two manual oil pumping plunger pairs appear in the current use scene, and the devices of the two small plunger pairs with the same cylinder diameter are used for solving the problem of low lifting efficiency of a single small plunger, but the plungers with the same cylinder diameter can not lighten the acting force required by manual operation when the jack is heavy load, increase the labor intensity of operators, meanwhile, the devices of the two sets of oil pumping plunger pairs are distributed in a runner on a base, 2 unidirectional sealing steel balls are directly located in an oil cylinder, so that sealing is not tight, pressure relief is easy to be caused, and meanwhile, the assembly process is complicated, and stability is poor, and the like are disadvantageous.

Disclosure of utility model

In view of the above, the present application provides a manual double-station jack, which solves the above problems, and has the advantages of improved lifting efficiency when no load is applied, small operating torque when heavy load is applied, and convenient assembly, safety, maintenance and use.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the manual double-station jack comprises a base, an oil tank shell, a jack main oil cylinder assembly arranged in the oil tank shell, a large plunger oil pumping mechanism and a small plunger oil pumping mechanism which are arranged on the base and can work independently, wherein the oil tank shell and the jack main oil cylinder assembly are connected with the base, an oil tank is formed between the oil tank shell and the jack main oil cylinder assembly, and an oil inlet channel used for communicating the oil tank and the plunger oil pumping mechanism, an oil supply channel used for communicating an oil cylinder barrel of the jack main oil cylinder assembly and the two plunger oil pumping mechanisms, and an oil return channel used for communicating the oil cylinder barrel and the oil tank are arranged in the base.

Further, a safe pressure relief channel used for enabling the oil cylinder barrel to be communicated with the oil tank is further arranged in the base.

Further, the oil inlet channel communicated with the oil tank and the large plunger pump oil mechanism comprises an oil tank oil outlet and return port, a corresponding plunger cylinder oil inlet channel and a large plunger cylinder oil inlet, wherein the oil tank oil outlet and return port, the corresponding plunger cylinder oil inlet channel and the large plunger cylinder oil inlet are horizontally distributed, and the large plunger cylinder oil inlet is internally provided with a first one-way valve.

Furthermore, the oil outlet and return port of the oil tank is also communicated with the oil return port of the oil cylinder through an oil return port channel with one end communicated with the outside, an oil return valve is arranged in the oil return port channel, and oil return is realized by unscrewing a sealing ball of the oil return valve.

Further, the oil inlet channel communicated with the oil tank and the small plunger pump oil mechanism comprises an oil tank oil outlet, a corresponding plunger cylinder oil inlet channel and a small plunger cylinder oil inlet, wherein the oil tank oil outlet, the corresponding plunger cylinder oil inlet channel and the small plunger cylinder oil inlet are arranged on the bottom surface of the oil tank, the small plunger cylinder oil inlet is horizontally arranged, and a first one-way valve is arranged in the small plunger cylinder oil inlet.

Further, the oil supply channel comprises an oil inlet channel of the oil cylinder and a double oil inlet process hole which are horizontally distributed and are communicated in a crisscross manner, the inner end of the double oil inlet process hole with the outer port being sealed is communicated with the oil inlet of the oil cylinder, the two ends of the oil inlet channel of the oil cylinder are respectively communicated with the oil outlet of the small plunger cylinder and the oil outlet of the large plunger cylinder through corresponding plunger cylinder oil outlet channels which are horizontally arranged, and two second check valves which are distributed in a 90-degree state are arranged in the oil supply channel.

Furthermore, the safety pressure relief channel comprises a safety valve pressure relief channel with two ends respectively communicated with the base boundary and the oil inlet channel of the oil cylinder, the safety valve pressure relief channel is communicated with the oil outlet of the oil tank, and a safety valve is arranged in the safety valve pressure relief channel.

Still further, the second check valve sequentially includes: the valve comprises a valve body, a steel ball, a spring retainer ring, a spring and a sealing ring, wherein the outer circular surface of the valve body is provided with threads and grooves which are arranged, a cross-shaped channel is arranged in the groove on the outer circular surface of the valve body, and the steel ball is propped against the outlet of the horizontal channel of the cross-shaped channel.

Further, the jack main oil cylinder assembly further comprises a piston rod assembly arranged on the oil cylinder barrel, the oil cylinder barrel is welded and connected with the base, and the oil cylinder barrel is provided with a guide sleeve assembly matched with the piston rod assembly.

Still further, the piston rod assembly comprises a piston rod installed inside the oil cylinder barrel, and a first guide ring and a sealing assembly which are attached to the inner wall of the oil cylinder barrel are arranged on the outer circumferential surface of the piston part of the piston rod.

Still further, the first guide ring is defined in an outer circumferential groove of the piston portion of the piston rod, the first guide ring being located between the rod body of the piston rod and the sealing assembly.

Further, the top of the piston rod is provided with a replaceable plug.

Still further, the uide bushing subassembly include with the uide bushing of upper end opening cooperation installation of oil cylinder, the hole below of uide bushing is equipped with two second guide rings and a sealing washer, and the sealing washer is located between two second guide rings, port department still is equipped with the dust ring on the hole of uide bushing, just the second guide ring with the dust ring all with the outer disc contact connection of the body of rod of piston rod.

From the above technical solution, the advantages of the present utility model are:

1. the application is provided with a large-small manual oil pumping mechanism with 2 large-small manual oil pumping mechanisms, the large plunger oil pumping mechanism can provide more hydraulic oil, so that a piston rod of a hydraulic cylinder can rapidly ascend when no load is applied, the small plunger oil pumping mechanism can lift a large-tonnage heavy object by a small working force under the load, and the operation is labor-saving under the heavy load;

2. the application is also provided with a safety valve for limiting load, thereby being safe to use;

3. The oil inlet channel, the oil supply channel, the oil return channel and the safety pressure relief channel are processed by using a processing technology hole, the number of drilling holes leading to the bottom of the jack main oil cylinder assembly is reduced, and the runner hole is drilled outside the jack main oil cylinder assembly, so that the capability of the base under large tonnage is improved;

4. The inner wall of the channel is smooth by processing the channel in a mode of processing the process holes, dead angle accumulation impurities cannot be generated when the oil in the jack body is cleaned and replaced, the sealing performance of the jack is affected, and the maintainability and the durability of the welding jack are greatly improved;

5. The check valves of the product are all outside the jack main oil cylinder assembly, and the steel balls of the first check valve are laterally and vertically distributed and sealed, so that the probability of impurity precipitation on a sealing surface can be greatly reduced, and the jack sealing performance is reliable; the mounting mode of the second one-way valve can be convenient to detach and clean, so that the abrasion of impurities to the steel ball can be reduced, and the sealing performance of the jack is reliable.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application.

Fig. 1 is a right-side view of the present application.

Fig. 2 is a schematic view of the sectional structure in the E-E direction in fig. 1.

Fig. 3 is a schematic diagram of a front view structure of the present application.

Fig. 4 is a schematic view of the cross-sectional structure in the C-C direction in fig. 3.

Fig. 5 is a schematic diagram of the sectional structure in the G-G direction in fig. 3.

Fig. 6 is a schematic top view of the present application.

Fig. 7 is a schematic view of the sectional structure in the J-J direction in fig. 6.

Fig. 8 is a schematic view of the sectional structure in the H-H direction in fig. 6.

Fig. 9 is a schematic top view of the transparent structure of the base of the present application.

Fig. 10 is a schematic view of a sectional structure of the base of fig. 9 in the Aa-Aa direction according to the present application.

Fig. 11 is a schematic view showing a sectional structure of the base of fig. 9 in the AF-AF direction according to the present application.

FIG. 12 is a schematic sectional view of the structure of the base of FIG. 9 in the AH-AH direction according to the present application.

Fig. 13 is a right-side view of the base of the present application.

FIG. 14 is a schematic diagram showing a cross-sectional structure in the AG-AG direction in FIG. 13 according to the present application.

Fig. 15 is a schematic front view of the base of the present application.

FIG. 16 is a schematic view of the structure of the present application in section in the AB-AB direction in FIG. 15.

Fig. 17 is a schematic view of the AC-AC direction cross-sectional structure of fig. 15 according to the present application.

Fig. 18 is a schematic diagram showing a sectional structure of the AD-AD direction in fig. 15 according to the present application.

Fig. 19 is a schematic view showing a sectional structure in the AE-AE direction in fig. 15 according to the present application.

FIG. 20 is a schematic view of the cross-sectional structure of the Y-Y direction in FIG. 15 according to the present application.

Fig. 21 is a schematic structural view of a first check valve according to the present application.

Fig. 22 is a schematic structural view of the oil return valve of the present application.

Fig. 23 is a schematic structural view of the piston rod assembly of the present application.

Fig. 24 is a schematic structural view of a guide sleeve assembly of the present application.

Reference numerals illustrate: the hydraulic oil pump comprises a plug 1, a piston rod assembly 2, a piston rod 211, a first guide ring 212, a sealing assembly 231, a guide sleeve assembly 3, a guide sleeve 31, a second guide ring 32, a guide sleeve sealing ring 33, a dust ring 34, an oil cylinder barrel 4, an oil tank shell 5, a large plunger oil pump mechanism 6, a small plunger oil pump mechanism 7, an oil return valve 8, a regulating valve core 81, a sealing ball 82, an oil return sealing ring 83, a base 9, a safety valve 10, a first one-way valve 11, a valve body 111, a sealing piece 112, a steel ball 113, a spring retainer 114, a spring 115, a large plunger oil inlet 12, a large plunger oil outlet 13, a double oil inlet process hole 14, a small plunger oil inlet 15, a small plunger oil outlet 16, an oil cylinder oil inlet channel 17, a plunger oil inlet channel 18, a safety valve pressure release channel 19, an oil return channel 20, a plunger oil outlet channel 21, a second one-way valve 23, an oil tank outlet 24, an oil tank outlet oil return 25, an oil cylinder oil inlet 26, an oil cylinder plug 27 and an oil cylinder plug 28.

Detailed Description

The present application will be described in further detail with reference to the following embodiments and the accompanying drawings, in order to make the objects, technical solutions and advantages of the present application more apparent. The exemplary embodiments of the present application and the descriptions thereof are used herein to explain the present application, but are not intended to limit the application.

It should be noted that, in the embodiments of the present application, all directional indicators (such as up, down, left, right, front, and rear … …) are merely used to explain the relative positional relationship, movement conditions, and the like between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the connection in which the directional indicator is correspondingly changed may be a direct connection or an indirect connection.

Referring to fig. 1 to 24, as shown in fig. 1, 3, 5, 6 and 7, the embodiment provides a manual double-station jack, which comprises a base 9, an oil tank shell 5, a jack main oil cylinder assembly arranged in the oil tank shell 5, and a large plunger oil pumping mechanism 6 and a small plunger oil pumping mechanism 7 which are all arranged on the base 9 and can work independently, wherein the oil tank shell 5 and the jack main oil cylinder assembly are all connected with the base 9 in a welding way, an oil tank is formed between the oil tank shell 5 and the jack main oil cylinder assembly, an oil inlet channel used for communicating the oil tank and the plunger oil pumping mechanism, an oil supply channel used for communicating an oil cylinder 4 of the jack main oil cylinder assembly and two oil supply channels used for communicating the plunger oil pumping mechanisms, and an oil return channel used for communicating the oil cylinder 4 and the oil tank are arranged in the base 9, the jack main oil cylinder assembly further comprises a piston rod assembly 2 arranged on the oil cylinder 4, and the bottom of the jack main oil cylinder assembly is in an open way is connected with the base 9 in a welding way. When the hydraulic jack is used, the large plunger oil pumping mechanism 6 can provide more hydraulic oil, the piston rod assembly 2 of the jack main oil cylinder assembly can quickly rise when no load, the small plunger oil pumping mechanism 7 can lift the piston rod 211 to lift a large tonnage heavy object with smaller working force, and the large plunger oil pumping mechanism 6 and the small plunger oil pumping mechanism 7 can work independently of each other, so that the piston rod 211 can quickly rise when no load by using the large plunger oil pumping mechanism 6 and the small plunger oil pumping mechanism 7 at the same time when no load.

Specifically, the oil cylinder barrel 4 is provided with the guide sleeve assembly 3 matched with the piston rod assembly 2, an oil tank is formed by an annular closed cavity between the oil tank shell 5, the oil cylinder barrel 4 and the base 9, the oil tank shell 5 and the oil cylinder barrel 4 are connected with the base 9 in a welding mode to form a jack main body, as shown in fig. 23, the piston rod assembly 2 comprises a piston rod 211 installed inside the oil cylinder barrel 4, the outer circumferential surface of the piston part of the piston rod 211 is provided with a first guide ring 212 and a sealing assembly 231 which are attached to the inner wall of the oil cylinder barrel 4, the first guide ring 212 is arranged in an outer circumferential groove of the piston part of the piston rod 211 in a limiting mode, the first guide ring 212 is located between a rod body of the piston rod 211 and the sealing assembly 213, as shown in fig. 24, the guide sleeve assembly 3 comprises a guide sleeve 31 matched with an upper end opening of the oil cylinder barrel 4, two second guide rings 32 and a sealing ring 33 are arranged below an inner hole, the two guide rings 33 are arranged between the two second guide rings 32, the guide rings 32 are connected with the outer circumferential surface of the piston rod body 34, the guide ring 34 is easy to detach and the guide sleeve assembly is provided with the outer circumferential surface of the piston rod assembly, and the guide sleeve assembly is easy to detach and the whole, and the guide ring is provided with a wear-resistant seal ring 34, and the whole is easy to detach and can be attached to the guide ring.

In the embodiment of the present application, the top of the piston rod 211 is provided with a replaceable plug 1, which is beneficial for replacement when the plug 1 is damaged.

Specifically, a fixing bolt passes through the plug 1 and is connected with the piston rod 211 to realize convenient replacement of the plug 1.

In the embodiment of the application, a safe pressure relief channel for communicating the oil cylinder 4 with the oil tank is also arranged in the base 9. And when the pressure in the oil cylinder barrel 4 is larger than the maximum safety value, the safety pressure release channel is utilized to release pressure, so that the use safety of the product is ensured.

As shown in fig. 2, 3, 6, 8, 9, 10, 13, 14, 15, 18 and 20, the oil supply channel comprises a horizontally distributed and crisscrossed oil cylinder oil inlet hole 17 and a double oil inlet process hole 14, the inner port of the double oil inlet process hole 14 with a sealed outer port is communicated with an oil cylinder oil inlet 26, two ends of the oil cylinder oil inlet hole 17 are respectively communicated with a small plunger cylinder oil outlet 16 and a large plunger cylinder oil outlet 13 through corresponding plunger cylinder oil outlet holes 21 which are horizontally arranged, and two second check valves 11 which are distributed in a 90-degree state are arranged in the oil supply channel.

Specifically, the double-oil inlet process hole 14 is located between two plunger oil pumping mechanisms, the oil cylinder oil inlet channel 17 penetrates through two ends of the base 9, a second one-way valve 11 and a plug 28 are respectively installed at two ends of the oil cylinder oil inlet channel 17, the two plunger oil cylinder oil outlet channels 21 and the double-oil inlet process hole 14 are parallel to each other, one end, far away from the oil cylinder oil inlet channel 17, of the plunger oil outlet channel 21 extends to the outer edge end surface of the base 9, a plug 28 is arranged at an outer port of the plunger oil cylinder oil outlet channel 21 communicated with the small plunger oil cylinder oil outlet 16, a second one-way valve 11 is installed in the plunger oil cylinder oil outlet channel 21 communicated with the large plunger oil cylinder oil outlet 13, oil discharged from the small plunger oil cylinder oil outlet 16 sequentially passes through the corresponding plunger oil cylinder oil outlet channel 21 and the second one-way valve 11 installed in the oil cylinder oil inlet channel 17 and then enters the oil cylinder oil inlet channel 17, and oil discharged from the oil cylinder oil inlet channel 17 passes through the double-process hole 14 and then enters the oil cylinder barrel 4 to push the piston rod assembly 2; the oil discharged from the oil outlet 13 of the large plunger cylinder firstly pushes the second one-way valve 11 arranged in the oil outlet channel 21 of the corresponding plunger cylinder to enter the oil outlet channel 21 of the corresponding plunger cylinder, then is converged into the oil inlet channel 17 of the oil cylinder, and enters the oil cylinder barrel 4 to push the piston rod assembly 2 to lift after passing through the double oil inlet process hole 14.

As shown in fig. 21, the second check valve 11 includes a valve body 111, a steel ball 113, a spring collar 114 and a spring 115 that are sequentially arranged, a thread and a groove for installation are provided on the outer circumference of the valve body 111, a sealing member 112 is further provided on the outer circumference of the valve body 111, a cross-shaped channel is provided in the valve body 111, a corresponding outlet of the cross-shaped channel is communicated with the groove, and the steel ball 113 abuts against an outlet of a horizontal channel of the cross-shaped channel. When the valve body 111 works, the oil enters the horizontal channel after entering the transverse channel of the cross-shaped channel of the valve body 111 through the corresponding channel, and when the pressure is enough, the steel ball 113 is pushed to be separated from the valve body 111, so that the second one-way valve 11 is opened, and the valve body 111 of the second one-way valve 11 has a sealing function, so that the oil can be prevented from flowing out from the position of the valve body 111 to the outside.

As shown in fig. 9, 11, 12 and 19, in the embodiment of the present application, the oil inlet channel for communicating the oil tank with the large plunger pump oil mechanism 6 includes an oil outlet and return port 25 vertically disposed on the bottom surface of the oil tank, a corresponding plunger cylinder oil inlet channel 18 horizontally distributed, and a large plunger cylinder oil inlet 12 vertically disposed, where a first check valve 23 is disposed in the large plunger cylinder oil inlet 12.

Specifically, the plunger cylinder oil inlet channel 18 is in a t shape, the transverse channel of the plunger cylinder oil inlet channel 18 is parallel to the oil cylinder oil inlet channel 17, one port of the plunger cylinder oil inlet channel 18 is communicated with the oil tank oil outlet and return port 25, the other two ports of the plunger cylinder oil inlet channel 18 extend to the outer boundary end surface of the base 9 and are sealed by the corresponding plugs 28, the large plunger cylinder oil inlet 12 is communicated with the corresponding longitudinal channel of the plunger cylinder oil inlet channel 18, the large plunger cylinder oil inlet 12 is in a stepped hole, a first check valve 23 is arranged in the large plunger cylinder oil inlet 12, the outlet of the first check valve 23 is communicated with the large plunger pump oil mechanism 6, and when the large plunger pump oil mechanism 6 is operated, the oil in the oil tank passes through the oil tank oil outlet and return port 25, the corresponding plunger cylinder oil inlet channel 18 and the large plunger cylinder 12 and is sucked into the large plunger pump mechanism 6 when negative pressure is generated in the large plunger pump mechanism 6.

As shown in fig. 3, 5, 6, 9 and 22, in the embodiment of the present application, the oil tank oil outlet/return port 25 is further communicated with the oil tank oil return port 27 through an oil return port 20 with one end communicating with the outside, and an oil return valve 8 is disposed in an outer port of the oil return port 20, and oil return is achieved by unscrewing a sealing ball 82 of the oil return valve 8.

Specifically, the plunger cylinder oil inlet port 18 communicated with the large plunger pump oil mechanism 6 is communicated with the oil return port 20, the oil return valve 8 further comprises an adjusting valve core 81 in threaded connection with the oil return port 20 and an oil return sealing ring 83 sleeved on the periphery of the adjusting valve core 81, the adjusting valve core 81 pushes a sealing ball 82 positioned in the oil return port 20 to prop against an oil return port of the oil return port 20, when the jack does not need oil return, the adjusting valve core 81 of the oil return valve 8 is screwed down to prevent the oil return port 20 from being communicated with the oil tank oil outlet and return port 25, at the moment, the oil tank oil outlet and return port 25 is communicated with the corresponding plunger cylinder oil inlet port 18, when the jack needs oil return, the adjusting valve core 81 of the oil return valve 8 is unscrewed to enable the sealing ball 82 to move, the oil tank oil return port 20 can be communicated with the oil tank oil outlet and return port 25, the oil in the oil tank main oil cylinder assembly enters the oil return port 20 through the oil cylinder oil return port 27, and returns to the oil tank through the oil tank oil outlet and return port 25, and the lifted piston rod is reset 211.

As shown in fig. 2, 3, 6, 14, 11, 12 and 17, in the embodiment of the present application, the oil inlet channel for communicating the oil tank with the small plunger pump oil mechanism 7 includes an oil tank oil outlet 24, a corresponding plunger cylinder oil inlet channel 18 and a small plunger cylinder oil inlet 15, which are sequentially communicated and arranged on the bottom surface of the oil tank, and the small plunger cylinder oil inlet 15 is arranged vertically, and a first check valve 11 is arranged in the small plunger cylinder oil inlet 15. The installation position of the first check valve 11, the structural form of the small plunger cylinder oil inlet 15 and the distribution mode of the plunger cylinder oil inlet channels 18 are the same as those of the large plunger pump oil mechanism 6.

As shown in fig. 4, 9, 12 and 16, the safety relief passage includes a safety valve relief passage 19 with two ends respectively communicating with the outside and the oil inlet passage 17 of the oil cylinder, the safety valve relief passage 19 communicates with the oil outlet 24 of the oil tank, and the safety valve 10 is disposed in the safety valve relief passage 19.

Specifically, the center plane of the relief valve oil-releasing hole 19 and the center plane of the oil cylinder oil-releasing hole 17 are located on the same plane, the plunger cylinder oil-releasing hole 18 is located above the relief valve oil-releasing hole 19, when the pressure in the oil cylinder barrel 4 is too high, the oil in the oil cylinder oil-releasing hole 17 is the same as the pressure in the oil cylinder barrel 4, and the oil in the oil cylinder oil-releasing hole 17 pushes the elastic floating ball of the relief valve 10, which is pressed against the port of the relief valve oil-releasing hole 19, open, and the oil enters the oil tank oil outlet 24 after passing through the relief valve oil-releasing hole 19.

The working principle of the large plunger oil pumping mechanism 6 and the small plunger oil pumping mechanism 7 of the application is the same, and the large plunger oil pumping mechanism 6 is taken as an example for explanation: when the large plunger oil pumping mechanism 6 is operated, firstly, the piston of the large plunger oil pumping mechanism 6 is pulled up, when negative pressure is generated in the large plunger oil pumping mechanism 6, oil in the oil tank is sucked into the large plunger oil pumping mechanism 6 through the oil tank oil outlet and return port 25, the corresponding plunger cylinder oil inlet hole 18 and the large plunger cylinder oil inlet 12, then the piston of the large plunger oil pumping mechanism 6 is pressed down, oil discharged from the large plunger cylinder oil outlet 13 firstly pushes away the second one-way valve 11 arranged in the corresponding plunger cylinder oil outlet hole 21 and then enters the corresponding plunger cylinder oil outlet hole 21, meanwhile, due to the pressure effect, the sealing steel ball 23 is pressed down to seal the hole 12, so that the oil cannot flow back into the oil tank, then flows into the oil cylinder oil inlet hole 17, enters the oil cylinder barrel 4 after passing through the double-oil-inlet process hole 14, and pushes the piston rod assembly 2 to lift up, and is repeated until the piston rod assembly 2 jacks up an object; when the pressure of the oil cylinder barrel 4 is overlarge, the oil in the oil inlet hole 17 of the oil cylinder pushes up an elastic floating ball of the safety valve 10, which is pressed against the port of the pressure relief hole 19 of the safety valve, and the oil enters the oil outlet 24 of the oil tank after passing through the pressure relief hole 19 of the safety valve; when the pressure relief is needed to be lowered, the oil return valve 8 is unscrewed to enable the oil return hole channel 20 and the oil tank oil outlet and return port 25, oil in the jack main oil cylinder assembly enters the oil return hole channel 20 through the oil tank oil return port 27 and returns to the oil tank through the oil tank oil outlet and return port 25, and the jack main oil cylinder assembly is lowered and reset.

According to the technical scheme, the oil inlet channel, the oil supply channel, the oil return channel and the safety pressure relief channel are processed by using the processing technology holes, the number of drilling holes leading to the bottom of the jack main oil cylinder assembly is reduced, and the runner hole is drilled outside the jack main oil cylinder assembly, so that the capability of the base under large tonnage is improved; because the flow channel and the external processing process hole are not sealed and plugged by welding, but a sealing process mode of screw threads and plugs is adopted, the inner wall of the channel is smooth, dead angle accumulation of impurities can not be generated when impurities are cleaned and oil in the jack body is replaced, and the impurities in the flow channel of the jack can be thoroughly cleaned only by unscrewing the plugs of the flow channel holes to the boundary, so that the sealing performance of the jack is not influenced, and the maintainability and the durability of the welding jack are greatly improved; the check valves of the product are all outside the jack main oil cylinder assembly, and the steel balls of the first check valve are laterally and vertically distributed and sealed, so that the probability of impurity precipitation on a sealing surface can be greatly reduced, and the jack sealing performance is reliable; the mounting mode of the second one-way valve can be convenient to detach and clean, so that the abrasion of impurities to the steel ball can be reduced, and the sealing performance of the jack is reliable.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, and various modifications and variations can be made to the embodiments of the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (13)

1. The manual double-station jack is characterized by comprising a base (9), an oil tank shell (5), a jack main oil cylinder assembly arranged in the oil tank shell (5), a large plunger oil pumping mechanism (6) and a small plunger oil pumping mechanism (7) which are all arranged on the base (9) and can work independently, wherein the oil tank shell (5) and the jack main oil cylinder assembly are connected with the base (9), an oil tank is formed between the oil tank shell (5) and the jack main oil cylinder assembly, and an oil inlet channel used for communicating the oil tank and the plunger oil pumping mechanism, an oil supply channel used for communicating an oil cylinder (4) of the jack main oil cylinder assembly and two oil supply channels used for communicating the plunger oil pumping mechanisms and an oil return channel used for communicating the oil cylinder (4) and the oil tank are arranged in the base (9).

2. Manual double-station jack according to claim 1, characterized in that a safety relief channel is also provided in the base (9) for the communication of the oil cylinder (4) with the oil tank.

3. The manual double-station jack according to claim 1, wherein the oil inlet channel for communicating the oil tank and the large plunger pump oil mechanism (6) comprises an oil tank oil outlet and return port (25) which are sequentially communicated and arranged on the bottom surface of the oil tank, a horizontally distributed corresponding plunger cylinder oil inlet duct (18) and a vertically arranged large plunger cylinder oil inlet (12), and a first one-way valve (23) is arranged in the large plunger cylinder oil inlet (12).

4. A manual double-station jack according to claim 3, characterized in that the oil tank outlet oil return port (25) is also communicated with the oil tank oil return port (27) through an oil return hole channel (20), an oil return valve (8) is arranged in the oil return hole channel (20), and oil return is realized by unscrewing a sealing ball (82) of the oil return valve (8).

5. The manual double-station jack according to claim 1, wherein the oil inlet channel for communicating the oil tank and the small plunger pump oil mechanism (7) comprises an oil tank oil outlet (24) arranged on the bottom surface of the oil tank, a corresponding plunger cylinder oil inlet channel (18) horizontally arranged and a small plunger cylinder oil inlet (15) vertically arranged, which are sequentially communicated, and a first one-way valve (23) is arranged in the small plunger cylinder oil inlet (15).

6. The manual double-station jack according to claim 1, wherein the oil supply channel comprises an oil cylinder oil inlet channel (17) and a double-oil inlet process hole (14) which are horizontally distributed and are communicated in a crisscross manner, an inner port of the double-oil inlet process hole (14) with a sealed outer port is communicated with an oil cylinder oil inlet (26), two ends of the oil cylinder oil inlet channel (17) are respectively communicated with a small plunger cylinder oil outlet (16) and a large plunger cylinder oil outlet (13) through corresponding plunger cylinder oil outlet channels (21) which are horizontally arranged, and two second check valves (11) which are distributed in a 90-degree state are arranged in the oil supply channel.

7. The manual double-station jack according to claim 2, wherein the safety pressure relief channel comprises a safety valve pressure relief channel (19) with two ends respectively communicated with the boundary of the base (9) and the oil inlet channel (17) of the oil cylinder, the safety valve pressure relief channel (19) is communicated with an oil outlet (24) of the oil tank, and a safety valve (10) is arranged in the safety valve pressure relief channel (19).

8. Manual double-station jack according to claim 6, characterized in that the second one-way valve (11) comprises in sequence: the valve comprises a valve body (111), a steel ball (113), a spring retainer ring (114), a spring (115) and a sealing ring, wherein the outer circle of the valve body (111) is provided with threads and grooves which are arranged, a cross-shaped channel is arranged in the groove on the outer circle of the valve body (111), and the steel ball (113) is propped against the outlet of the horizontal channel of the cross-shaped channel.

9. Manual double-station jack according to claim 1, characterized in that the jack master cylinder assembly further comprises a piston rod assembly (2) mounted on the oil cylinder barrel (4), the oil cylinder barrel (4) with an open bottom is welded with the base (9), and the oil cylinder barrel (4) is provided with a guide sleeve assembly (3) matched with the piston rod assembly (2).

10. Manual double-station jack according to claim 9, characterized in that the piston rod assembly (2) comprises a piston rod (211) fitted inside the oil cylinder (4), the outer circumferential surface of the piston part of the piston rod (211) being provided with a first guide ring (212) and a sealing assembly (213) which are in abutment with the inner wall of the oil cylinder (4).

11. Manual double-station jack according to claim 10, characterized in that the first guide ring (212) is defined in an external circular groove of the piston portion of the piston rod (211), the first guide ring (212) being located between the rod body of the piston rod (211) and a sealing assembly (213).

12. Manual double-station jack according to claim 10, characterized in that the top of the piston rod (211) is provided with a replaceable head (1).

13. Manual double-station jack according to claim 10, characterized in that the guide sleeve assembly (3) comprises a guide sleeve (31) which is matched with the upper end opening of the oil cylinder barrel (4), two second guide rings (32) and a sealing ring (33) are arranged below the inner hole of the guide sleeve (31), the sealing ring (33) is arranged between the two second guide rings (32), a dust ring (34) is further arranged at the upper end opening of the inner hole of the guide sleeve (31), and the second guide rings (32) and the dust ring (34) are in contact connection with the outer circular surface of the rod body of the piston rod (211).