Electric hydraulic device of jack with improved structure

Abstract

The utility model discloses a structure-improved electric hydraulic device of a jack and belongs to the technical field of jacks. Which comprises a motor, an oil pump, a valve body and an oil cylinder, and is characterized by further comprising an oil cylinder column retraction control mechanism, and the oil cylinder column retraction control mechanism is arranged on the valve body and communicated with the oil cylinder through an oil duct in the valve body; the motor is in transmission connection with the oil pump, the oil pump and the motor are arranged on the left side of the valve body in a horizontal state, the oil cylinder is arranged on the right side or the left side of the valve body in a horizontal state, and the oil pump is communicated with the oil cylinder through an oil channel formed in the valve body. The device has the advantages that the load can be lowered as long as the oil cylinder column retraction control mechanism is electrified, so that the condition that retraction of the oil cylinder column is controlled by reverse working of a motor can be avoided; the oil duct structure in the valve body is obviously simplified, the machining difficulty of the valve body is reduced, the machining efficiency is improved, the machining cost is saved, and action noise and part abrasion are reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of jack, concretely relates to an electric hydraulic device of structural improved jack. BACKGROUND

[0002] The driving mode of hydraulic jack has manual driving, pneumatic driving and electric driving. Manual driving, namely manual hydraulic jack, operates hydraulic pump through manual lever to generate hydraulic pressure, thereby driving the work of hydraulic jack, which has certain advantages for outdoor or power-free occasions, but is laborious to operate and slow to lift. Air driving, namely pneumatic hydraulic jack, drives piston movement through compressed gas, which has the advantages of fast response and convenient adjustment, and is widely used in mechanical manufacturing, automobile maintenance and other fields. Electric driving, namely electric hydraulic jack, lifts through motor-driven balance valve or pump, which is fast and easy to operate, and is commonly used in power equipment, vehicle maintenance and railway maintenance. Since electric driving, namely electric hydraulic jack, has the advantages of meeting the use requirements of high efficiency, automatic operation and relatively harsh working conditions, it is highly valued by the automobile maintenance industry.

[0003] In the disclosed Chinese patent documents, there are technical information related to electric driving, namely electric hydraulic jack, such as CN202744265U recommended "a multifunctional electric jack for vehicle" and CN203877842U provided "a multifunctional electric jack for vehicle", etc. The foregoing two patents have the technical effects recorded in the technical effect column of their specifications. However, they have the same shortcomings as follows: Since the piston rod (namely "oil cylinder column") needs to be extended and retracted by the forward and reverse rotation of the motor (for details, see CN202744265U specification 0015-0017 and CN203877842U specification 0021), in order to adapt to the forward and reverse rotation of the motor, a reversing structure needs to be set in the valve body, which leads to complex valve body oil circuit, not only increasing the processing difficulty and cost, but also increasing the failure rate in use; In the work process of extending and retracting the piston rod (namely "oil cylinder column") by the forward and reverse rotation of the motor to drive the lifting arm and the tray to rise and fall, the action noise is large and the parts are easy to wear and age.

[0004] In view of the above situation, it is necessary to improve, and for this purpose, the applicant has made beneficial exploration and design, forming the technical scheme to be introduced below. CONTENT OF THE UTILITY MODEL

[0005] The utility model discloses a task is to provide a kind of electric hydraulic device of jack, which is helpful to make the action of oil cylinder column sleeve of oil cylinder column retracting from being controlled by motor, so as to simplify valve body structure, reduce the machining difficulty of valve body, improve machining efficiency, save processing cost, reduce action noise and reduce component wear, and ensure the expected service life within a reasonable period of time.

[0006] The utility model discloses a task is to provide a kind of electric hydraulic device of jack, which is helpful to make the action of oil cylinder column sleeve of oil cylinder column retracting from being controlled by motor, so as to simplify valve body structure, reduce the machining difficulty of valve body, improve machining efficiency, save processing cost, reduce action noise and reduce component wear, and ensure the expected service life within a reasonable period of time.

[0007] In one specific embodiment of the utility model, a pump oil cavity recessed in the left side surface of the valve body is formed in the central position of the left side of the valve body, a pump oil cavity oil inlet hole, a pump oil cavity oil outlet hole, an oil pump driving shaft pivot support hole and an oil pump driven shaft pivot support hole are formed in the pump oil cavity, the pump oil cavity oil inlet hole and the pump oil cavity oil outlet hole are communicated with the oil cylinder through the oil channels formed in the valve body, the oil pump is matched with the pump oil cavity and also simultaneously matched with the oil pump driving shaft pivot support hole and the oil pump driven shaft pivot support hole; an oil cylinder seat is formed in the central region of the right side of the valve body, the oil cylinder seat forms an oil cylinder column sleeve matching cavity, an oil cylinder oil inlet hole and an oil cylinder oil return hole are formed in the oil cylinder column sleeve matching cavity, and an oil storage cavity oil return hole, a pressure relief hole and an oil storage cavity oil suction hole are formed on the right end surface of the oil cylinder seat, the oil cylinder is matched with the oil cylinder column sleeve matching cavity in a horizontal state, the oil cylinder oil inlet hole, the oil cylinder oil return hole, the oil storage cavity oil return hole, the pressure relief hole and the oil storage cavity oil suction hole are communicated with the oil cylinder through the oil channels formed in the valve body; the oil cylinder column retracting control mechanism arranged on the valve body is communicated with the oil cylinder oil return hole and the oil storage cavity oil return hole.

[0008] In another specific embodiment of the utility model, the oil pump is transmission connection with the motor through a transition connecting mechanism arranged between the oil pump and the motor, the oil pump includes an oil pump cover, an oil pump driving shaft, an oil pump driven shaft, an oil pump driving shaft gear and an oil pump driven shaft gear, a flange of the oil pump cover is protruded from the right side of the oil pump cover and is formed in the middle area of the right side of the oil pump cover and the position corresponding to the oil pumping cavity, the flange of the oil pump cover is inserted into the oil pumping cavity to form a complementary cooperation relationship with the oil pumping cavity, and the oil pump cover is fixed with the valve body at the position corresponding to the oil pump cover fixing screw hole arranged in the left side of the valve body through a group of oil pump cover fixing screws distributed at intervals, a first oil guide groove and a second oil guide groove are formed in the right side of the oil pump cover, the first and second oil guide grooves are communicated with each other, the oil inlet hole of the oil pumping cavity corresponds to and communicates with the first oil guide groove, the oil outlet hole of the oil pumping cavity corresponds to and communicates with the second oil guide groove, the left end of the oil pump driving shaft is extended to the left side of the oil pump cover through the oil pump driving shaft hole arranged in the central position of the oil pump cover and is transmission connection with the transition connecting mechanism, and the right end of the oil pump driving shaft is rotatably supported in the oil pump driving shaft pivot supporting hole, the left end of the oil pump driven shaft is rotatably supported in the oil pump driven shaft supporting hole arranged in the right side of the oil pump cover, the right end of the oil pump driven shaft is rotatably supported in the oil pump driven shaft pivot supporting hole, the oil pump driving shaft gear is fixed on the oil pump driving shaft in the oil pumping cavity, and the oil pump driven shaft gear is fixed on the oil pump driven shaft in the oil pumping cavity and is engaged with the oil pump driving shaft gear.

[0009] In another specific embodiment of the utility model, a flange sealing ring is arranged in the oil pumping cavity, the flange sealing ring is sleeved on the oil pump cover flange to form a sealing cooperation between the outer wall of the oil pump cover flange and the cavity wall of the oil pumping cavity, a driving shaft sealing sleeve hole with a diameter larger than that of the oil pump driving shaft hole is arranged in the central position of the oil pump cover and the position corresponding to the oil pump driving shaft hole, a driving shaft sealing sleeve is embedded in the driving shaft sealing sleeve hole, and the oil pump driving shaft is transmission connection with the transition connecting mechanism after penetrating through the oil pump driving shaft hole and the driving shaft sealing sleeve and extending to the left side of the driving shaft sealing sleeve.

[0010] In still another specific embodiment of the utility model, at least a pair of pump cover screw holes are formed on the oil pump cover; the transition connecting mechanism comprises an outer cover, a transition connecting sleeve, a motor shaft fixing disc and a motor fixed connecting seat, the outer cover is formed with an outer cover cavity with an open left side, a transition connecting sleeve pivot position hole is formed on the right side cavity bottom wall of the outer cover cavity and located at the central position of the cavity bottom wall, the middle part of the transition connecting sleeve corresponds to the transition connecting sleeve pivot position hole, the left end is inserted into the outer cover cavity, and the right end extends to the right side of the cavity bottom wall, the motor shaft fixing disc is arranged in the outer cover cavity at a position corresponding to the left end of the transition connecting sleeve, the motor fixed connecting seat is arranged on the right side of the outer cover, and the motor fixed connecting seat is fixed with the left side of the oil pump cover through at least a pair of motor fixed connecting seat screws after penetrating the outer cover screw holes formed on the outer cover and rotating into the pump cover screw holes formed on the oil pump cover, a motor fixed connecting seat motor shaft through hole penetrating from the left side to the right side of the motor fixed connecting seat is formed at the central position of the motor fixed connecting seat, the motor fixed connecting seat motor shaft through hole corresponds to the motor shaft fixing disc hole formed at the central position of the motor shaft fixing disc, a motor shaft fixing disc shaft head extends to the right at the central position of the right side of the motor shaft fixing disc, the motor shaft fixing disc shaft head is connected with the oil pump driving shaft insertion hole formed at the central position of the transition connecting sleeve and penetrating from the left end to the right end of the transition connecting sleeve, the motor shaft of the motor extends to the right, the motor shaft is inserted into the motor shaft fixing disc hole after penetrating the motor fixed connecting seat motor shaft through hole and is fixed with the motor shaft fixing disc through a key, and the motor is fixed with the left side of the motor fixed connecting seat through a motor fixing screw.

[0011] In still another specific embodiment of the utility model, the cross-sectional shape of the left end of the oil pump driving shaft and the cross-sectional shape of the motor shaft fixing disc shaft head are both D-shaped, the cross-sectional shape of the oil pump driving shaft insertion hole is also D-shaped, a motor shaft key matching groove is formed on the hole wall of the motor shaft fixing disc hole of the motor shaft fixing disc, and a motor shaft key is formed on the motor shaft and at a position corresponding to the motor shaft key matching groove, and the motor shaft key matches with the motor shaft key matching groove.

[0012] In a further specific embodiment of the utility model, a recessed oil cylinder outer sleeve fitting groove is formed on the right side surface of the oil cylinder seat in the central region of the right side of the valve body and around the circumferential direction of the oil cylinder seat; the oil cylinder comprises an oil cylinder outer sleeve, an oil cylinder column sleeve, an oil cylinder oil storage cavity, an oil cylinder column and a pressure oil cavity, the left end of the oil cylinder outer sleeve is sealingly fitted with the oil cylinder outer sleeve fitting groove, the left end of the oil cylinder column sleeve is fitted with the oil cylinder column sleeve fitting cavity, the oil cylinder oil storage cavity is located between the outer wall of the oil cylinder column sleeve and the inner wall of the oil cylinder outer sleeve, the oil cylinder column is movably located in the oil cylinder column sleeve, an oil cylinder column piston is arranged at the left end of the oil cylinder column, the pressure oil cavity is divided into a left oil cavity located at the left side of the oil cylinder column piston and a right oil cavity located at the right side of the oil cylinder column piston by the oil cylinder column piston; the oil cylinder oil inlet hole and the oil cylinder oil return hole are communicated with the left oil cavity; the oil storage cavity oil return hole, the pressure relief hole and the oil storage cavity oil suction hole are communicated with the oil cylinder oil storage cavity.

[0013] In a further specific embodiment of the utility model, a recessed oil cylinder outer sleeve fitting groove is formed on the right side surface of the oil cylinder seat in the central region of the right side of the valve body and around the circumferential direction of the oil cylinder seat; the oil cylinder comprises an oil cylinder outer sleeve, an oil cylinder column sleeve, an oil cylinder oil storage cavity, an oil cylinder column and a pressure oil cavity, the left end of the oil cylinder outer sleeve is sealingly fitted with the oil cylinder outer sleeve fitting groove, the left end of the oil cylinder column sleeve is fitted with the oil cylinder column sleeve fitting cavity, the oil cylinder oil storage cavity is located between the outer wall of the oil cylinder column sleeve and the inner wall of the oil cylinder outer sleeve, the oil cylinder column is movably located in the oil cylinder column sleeve, an oil cylinder column piston is arranged at the left end of the oil cylinder column, the pressure oil cavity is divided into a left oil cavity located at the left side of the oil cylinder column piston and a right oil cavity located at the right side of the oil cylinder column piston by the oil cylinder column piston; the oil cylinder oil inlet hole and the oil cylinder oil return hole are communicated with the left oil cavity; the oil storage cavity oil return hole, the pressure relief hole and the oil storage cavity oil suction hole are communicated with the oil cylinder oil storage cavity.

[0014] In still another specific embodiment of the utility model, a storage oil cavity oil suction passage is longitudinally arranged in the middle of the valve body and at the left side of the oil cylinder column retraction control mechanism, the bottom of the storage oil cavity oil suction passage is communicated with the storage oil cavity oil suction hole, the middle of the storage oil cavity oil suction passage is communicated with the pump oil cavity oil inlet hole, a storage oil cavity oil suction passage steel ball valve is arranged in the storage oil cavity oil suction passage to open or block the oil passage between the storage oil cavity oil suction hole and the pump oil cavity oil inlet hole, the upper end of the storage oil cavity oil suction passage is blocked by a storage oil cavity oil suction passage plug, and the storage oil cavity oil suction passage plug is fixedly screwed in the storage oil cavity oil suction passage hole arranged on the valve body at the left side of the oil cylinder column retraction control mechanism.

[0015] In still another specific embodiment of the utility model, a pressure regulating valve hole is longitudinally arranged in the middle of the valve body and at the left side of the oil cylinder column retraction control mechanism, a pressure relief hole oil passage on-off steel ball valve, a steel ball valve acting spring and a spring pressure adjusting screw are arranged in the pressure regulating valve hole from bottom to top, the pressure relief hole oil passage on-off steel ball valve opens or blocks the oil passage between the pressure relief hole and the pump oil cavity oil outlet hole, the lower end of the steel ball valve acting spring is supported on the pressure relief hole oil passage on-off steel ball valve, and the upper end is supported on the lower end face of the spring pressure adjusting screw, the spring pressure adjusting screw is fixedly screwed in the hole wall inner thread formed on the hole wall at the upper end of the pressure regulating valve hole; wherein, a pressure relief passage is arranged in the valve body and at the position corresponding to the lower side of the pressure relief hole oil passage on-off steel ball valve, the pressure relief passage is communicated with the pressure relief hole and the pump oil cavity oil outlet hole, and the opening and closing of the pressure relief passage and the pressure relief hole is controlled by the pressure relief hole oil passage on-off steel ball valve.

[0016] The technical effect of the technical scheme provided by the utility model is that, because the oil cylinder column retraction control mechanism communicated with the oil cylinder through the oil passage in the valve body is arranged on the valve body, when the oil cylinder column of the oil cylinder is extended to lift the load such as a vehicle by the lifting arm of the jack and the oil cylinder column needs to be retracted and the load needs to be lowered after the maintenance work is completed, the load can be lowered by electrifying the oil cylinder column retraction control mechanism, so that the retraction of the oil cylinder column is not controlled by the reverse operation of the motor, the motor does not need to be a motor with forward and reverse rotation functions, the oil passage structure in the valve body is significantly simplified, the machining difficulty of the valve body is reduced, the machining efficiency is improved, the machining cost is saved, the action noise is reduced, the part wear is reduced, and the expected service life of the jack within a reasonable period of time is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The embodiment structure diagram of the utility model is shown in the figure;

[0018] Figure 2 The embodiment structure diagram of the utility model is shown in the figure;Figure 1 The diagram shows the structure of the oil pump system as viewed from the right side of the pump cover.

[0019] Figure 3 for Figure 1 The diagram shows the structure of the valve body viewed from the left side.

[0020] Figure 4 for Figure 1 The diagram shows the structure of the valve body viewed from the right side.

[0021] Figure 5 for Figure 1 The cross-sectional view of the hydraulic cylinder shown;

[0022] Figure 6 To set Figure 1 A schematic diagram of the oil suction chamber and oil storage channel inside the valve body is shown.

[0023] Figure 7 This is a schematic diagram of the oil inlet channel and connecting oil passage located at the left end of the valve body.

[0024] Figure 8 for Figure 7 The diagram shows the connection between the oil inlet channel and the oil inlet of the cylinder.

[0025] Figure 9 for Figure 1 The diagram shows a detailed structural diagram of the hydraulic cylinder retraction control mechanism.

[0026] Figure 10 for Figure 4 and Figures 6 to 8 The oil return hole of the cylinder shown is Figure 9 A schematic diagram showing the interconnected state of the mesh-type oil passage;

[0027] Figure 11 This is a schematic diagram of a pressure regulating valve port located within the valve body.

[0028] Figure 12 This is a schematic diagram illustrating an application example of this utility model. Detailed Implementation

[0029] In order to better understand the technical essence and beneficial effects of this utility model, the applicant provides a detailed description below by way of embodiments. However, the description of the embodiments is not intended to limit the solution of this utility model. Any formal but not substantive equivalent transformations made based on the concept of this utility model should be considered within the scope of the technical solution of this utility model.

[0030] In the following description, all directional or positional concepts involving up, down, left, right, front, and back are based on the current position. Figure 1The position state is taken as a reference, so it cannot be understood as a special limitation of the technical scheme provided by the utility model.

[0031] Please see Figure 1 , shows the motor 1, oil pump 2, valve body 3 (may also be called "valve seat", same below) and oil cylinder 4. As the technical points of the technical scheme provided by the utility model: the hydraulic system of the structure of the jack further includes an oil cylinder column retraction control mechanism 6, which is provided on the valve body 3 and communicated with the oil cylinder 4 through the oil channel opened in the valve body 3; the motor 1 is drivingly connected with the oil pump 2 and is arranged in a horizontal state with the oil pump 2 and the motor 1 on the left side of the valve body 3, in this embodiment, the oil cylinder 4 is also arranged in a horizontal state on the right side of the valve body 3, but the oil cylinder 4 can also be arranged in a horizontal state on the left side of the valve body 3 according to the need, the oil pump 2 is communicated with the oil cylinder 4 through the oil channel opened in the valve body 3. In this embodiment, the oil pump is preferably but not limited to a gear pump.

[0032] Please see Figure 1 , a pump oil cavity 31 recessed on the left surface of the valve body 3 is opened at the central position of the left side of the valve body 3, a pump oil cavity oil inlet hole 311, a pump oil cavity oil outlet hole 312, an oil pump driving shaft pivot support hole 313 and an oil pump driven shaft pivot support hole 314 are opened in the pump oil cavity 31, the pump oil cavity oil inlet hole 311 and the pump oil cavity oil outlet hole 312 are communicated with the oil cylinder 4 through the oil channel opened in the valve body 3, the oil pump 2 is matched with the pump oil cavity 31 and is also rotatably matched with the oil pump driving shaft pivot support hole 313 and the oil pump driven shaft pivot support hole 314.

[0033] Please see Figure 4 , an oil cylinder seat 32 is formed at the central area of the right side of the valve body 3, the oil cylinder seat 32 is formed with an oil cylinder column sleeve matching cavity 321, an oil cylinder oil inlet hole 3211 and an oil cylinder oil return hole 3212 are opened in the oil cylinder column sleeve matching cavity 321, and an oil storage cavity oil return hole 3221, a pressure relief hole 3222 and an oil storage cavity oil suction hole 3223 are spaced apart on the right end surface 322 of the oil cylinder seat 32, the oil cylinder 4 is matched with the oil cylinder column sleeve matching cavity 321 in a horizontal state, the oil cylinder oil inlet hole 3211, the oil cylinder oil return hole 3212, the oil storage cavity oil return hole 3221, the pressure relief hole 3222 and the oil storage cavity oil suction hole 3223 are communicated with the oil cylinder 4 through the oil channel opened in the valve body 3; the oil cylinder column retraction control mechanism 6 provided on the valve body 3 is communicated with the oil cylinder oil return hole 3212 and the oil storage cavity oil return hole 3221.

[0034] Please see Figures 1 to 3The aforementioned oil pump 2 is connected to the aforementioned motor 1 via a transition connection mechanism 5 disposed between the oil pump 2 and the aforementioned motor 1. That is, the aforementioned motor 1 is connected to the oil pump 2 via the transition connection mechanism 5. The oil pump 2 includes an oil pump cover 21, an oil pump drive shaft 22, an oil pump driven shaft 23, an oil pump drive shaft gear 24, and an oil pump driven shaft gear 25. A protrusion is formed in the middle right side region of the oil pump cover 21, corresponding to the aforementioned oil pump chamber 31. The oil pump cover flange 211 on the right side of the oil pump cover 21 is inserted into the oil pump chamber 31 to form a mutually compensating fit with the oil pump chamber 31. A set of spaced-apart oil pump cover fixing screws 212 fixes the oil pump cover 21 to the valve body 3 at positions corresponding to the oil pump cover fixing screw holes 315 on the left side of the aforementioned valve body 3. A first oil guide groove 217 and a second oil guide groove 218 are formed on the right side of the oil pump cover 21. Figure 2 As shown), the first oil guide groove 217 and the second oil guide groove 218 of the pump cover are interconnected. The aforementioned oil inlet hole 311 of the pump chamber corresponds to and communicates with the first oil guide groove 217 of the pump cover, and the aforementioned oil outlet hole 312 of the pump chamber corresponds to and communicates with the second oil guide groove 218 of the pump cover. The left end of the oil pump drive shaft 22 extends to the left side of the oil pump cover 21 through the oil pump drive shaft hole 213 opened in the center of the oil pump cover 21 and is connected to the aforementioned transition connection mechanism 5. The right end of the oil pump drive shaft 22 rotates... The left end of the oil pump driven shaft 23 is rotatably supported in the oil pump driven shaft support hole 214 opened on the right side of the oil pump cover 21, while the right end of the oil pump driven shaft 23 is rotatably supported in the aforementioned oil pump driven shaft pivot support hole 314. The oil pump drive shaft gear 24 is fixed on the aforementioned oil pump drive shaft 22 in the aforementioned oil pump chamber 31, and the oil pump driven shaft gear 25 is fixed on the aforementioned oil pump driven shaft 23 in the aforementioned oil pump chamber 31 and meshes with the oil pump drive shaft gear 24.

[0035] A pump cover flange sealing ring 316 is provided in the aforementioned pump oil chamber 31. The pump cover flange sealing ring 316 is sleeved on the aforementioned oil pump cover flange 211, so that the outer wall of the oil pump cover flange 211 and the cavity wall of the pump oil chamber 31 form a sealing fit. At the center of the aforementioned oil pump cover 21 and at the position corresponding to the aforementioned oil pump drive shaft hole 213, a drive shaft sealing sleeve hole 215 with a diameter larger than the diameter of the oil pump drive shaft hole 213 is opened. A drive shaft sealing sleeve 2151 is embedded in the drive shaft sealing sleeve hole 215. The aforementioned oil pump drive shaft 22 passes through the oil pump drive shaft hole 213 and then passes through the drive shaft sealing sleeve 2151 and extends to the left side of the drive shaft sealing sleeve 2151 to drive the connection mechanism 5.

[0036] The applicant needs to explain that if the form is changed and the oil cylinder 4 is arranged on the same side of the valve body 3 as the left side or the right side together with the oil pump 2 and the motor 1, it should be considered as an equivalent technical means and still belongs to the technical connotation range disclosed by the utility model. When the oil cylinder 4 is arranged on the left side of the valve body 3, the aforementioned oil cylinder seat 32 and the related components arranged with the oil cylinder seat 32 as the carrier are also correspondingly transferred to the left side of the valve body 3, and according to professional common sense, the aforementioned oil return hole channel 3311 and the oil drain hole channel 3312 are also correspondingly transferred to the left side with the oil cylinder seat 32.

[0037] Focus on Figure 1A pair of pump cover screw holes 216 are formed in the oil pump cover 21. The transition connecting mechanism 5 includes an outer cover 51, a transition connecting sleeve 52, a motor shaft fixing disc 53, and a motor fixing connecting seat 54. The outer cover 51 has a left side opening outer cover cavity 511. A transition connecting sleeve pivot displacement hole 512 is formed in the right side cavity bottom wall of the outer cover cavity 511. The middle part of the transition connecting sleeve 52 corresponds to the transition connecting sleeve pivot displacement hole 512. The left end of the transition connecting sleeve 52 extends into the outer cover cavity 511, and the right end extends to the right side of the cavity bottom wall. The motor shaft fixing disc 53 is arranged in the outer cover cavity 511 at a position corresponding to the left end of the transition connecting sleeve 52. The motor fixing connecting seat 54 is arranged on the right side of the outer cover 51. The motor fixing connecting seat 54 is fixed to the left side of the oil pump cover 21 by a pair of motor fixing connecting seat screws 542 through outer cover screw holes 513 formed in the outer cover 51 and the pump cover screw holes 216 formed in the oil pump cover 21. A motor fixing connecting seat motor shaft through hole 541 is formed in the motor fixing connecting seat 54 at a position corresponding to the left side of the motor fixing connecting seat 54. The motor fixing connecting seat motor shaft through hole 541 corresponds to a motor shaft fixing disc hole 531 formed in the center of the motor shaft fixing disc 53. The motor shaft fixing disc hole 531 is a blind hole. A motor shaft fixing disc shaft head 532 extends to the right side of the right side of the motor shaft fixing disc 53 at a position corresponding to the center of the motor shaft fixing disc 53. The motor shaft fixing disc shaft head 532 is connected to an oil pump driving shaft insertion hole 521 formed in the center of the transition connecting sleeve 52 and extending from the left end to the right end of the transition connecting sleeve 52. The motor shaft 11 of the motor 1 extends to the right side. The motor shaft 11 is inserted into the motor shaft fixing disc hole 531 through the motor fixing connecting seat motor shaft through hole 541 and is fixed to the motor shaft fixing disc 53 by a flat key. The motor 1 is fixed to the left side of the motor fixing connecting seat 54 by a motor fixing screw 12. The left end of the oil pump driving shaft 22 is fixed to the right end of the oil pump driving shaft insertion hole 521 through the driving shaft sealing sleeve 2151 and is fixed to the transition connecting sleeve 52. The motor shaft fixing disc shaft head 532 is inserted into the left end of the oil pump driving shaft insertion hole 521 and is fixed to the transition connecting sleeve 52.

[0038] Continue to see Figure 1 The cross-sectional shape of the left end of the oil pump driving shaft 22 and the cross-sectional shape of the motor shaft fixing disc shaft head 532 are both D-shaped. The cross-sectional shape of the oil pump driving shaft insertion hole 521 is also D-shaped. A motor shaft key matching groove is formed in the hole wall of the motor shaft fixing disc hole 531 of the motor shaft fixing disc 53. A motor shaft key is formed on the motor shaft 11 at a position corresponding to the motor shaft key matching groove. The motor shaft key matches the motor shaft key matching groove.

[0039] Please see Figure 5 And combined Figure 1 and Figure 4 On the right side of the cylinder seat 32, which is located in the central region on the right side of the aforementioned valve body 3, and in the circumferential direction of the cylinder seat 32, there is a cylinder sleeve fitting groove 323 recessed into the right side of the cylinder seat 32. Figure 4 (See diagram); The aforementioned hydraulic cylinder 4 includes a hydraulic cylinder outer sleeve 41, a hydraulic cylinder plunger sleeve 42, a hydraulic cylinder oil storage chamber 43, a hydraulic cylinder plunger 44, and a pressure oil chamber 45. The left end of the hydraulic cylinder outer sleeve 41 is sealed and fitted with the aforementioned hydraulic cylinder outer sleeve fitting groove 323. The left end of the hydraulic cylinder plunger sleeve 42 is fitted with the aforementioned hydraulic cylinder plunger sleeve mating cavity 321. The hydraulic cylinder oil storage chamber 43 is located between the outer wall of the hydraulic cylinder plunger sleeve 42 and the inner wall of the hydraulic cylinder outer sleeve 41. The hydraulic cylinder plunger 44 is movably located within the hydraulic cylinder plunger sleeve 42. A hydraulic cylinder plunger piston 441 is provided at the left end of the hydraulic cylinder plunger 44. A piston sealing ring 4411 is provided on the outer wall of 41. The cylinder piston 441 divides the aforementioned pressure oil chamber 45 into a left oil chamber 451 located on the left side of the cylinder piston 441 and a right oil chamber 452 located on the right side of the cylinder piston 441, and the piston sealing ring 4411 seals the separation. The aforementioned cylinder inlet 3211 and cylinder return 3212 are connected to the aforementioned left oil chamber 451. The aforementioned oil storage chamber return 3221, pressure relief 3222 and oil storage chamber suction 3223 are connected to the aforementioned oil storage chamber 43.

[0040] To facilitate understanding of this utility model, Figure 1 It also shows that it belongs to Figure 12 The hydraulic cylinder push shaft 76 of the jack 7 shown has a hydraulic cylinder hinge head 442 extending from the center of the right end face of the aforementioned hydraulic cylinder 44. A hinge head cotter pin hole 4421 is provided on the hydraulic cylinder hinge head 442. A hydraulic cylinder hinge head mating hole 761 is provided at the middle of the length direction of the aforementioned hydraulic cylinder push shaft 76, corresponding to the position of the hydraulic cylinder hinge head 442. A hydraulic cylinder hinge head mating hole 761 is provided at the upper and lower parts of the hydraulic cylinder push shaft 76, corresponding to the position of the hydraulic cylinder hinge head 442. Each of the positions of the shaft head mating hole 761 has a corresponding cylinder column push shaft cotter pin hole 762. The cylinder column push shaft cotter pin hole 762 communicates with the cylinder column hinge shaft head mating hole 761. After the aforementioned cylinder column hinge shaft head 442 is inserted into the cylinder column hinge shaft head mating hole 761, the cotter pin 7621 is inserted into the hinge shaft head cotter pin hole 4421 through the cylinder column push shaft cotter pin hole 762 to hinge (or "connect") the cylinder column hinge shaft head 442 and the cylinder column push shaft 76.

[0041] Please see Figures 7 to 10In the middle of the valve body 3 and above the position corresponding to the oil cylinder seat 32, there is an electromagnetic valve body fixing seat 33 bulging out of the rear surface of the valve body 3, and an electromagnetic valve body fixing hole 331 is formed in the position corresponding to the electromagnetic valve body fixing seat 33. Figure 9 As shown in the figure, the oil cylinder column retraction control mechanism 6 includes a hydraulic electromagnetic valve 61 with an electromagnetic coil and a valve core 616 inside, which is arranged on the electromagnetic valve body fixing seat 33 in the position corresponding to the electromagnetic valve body fixing hole 331, the upper end of the hydraulic electromagnetic valve 61 protrudes out of the upper surface of the electromagnetic valve body fixing seat 33, the middle and the lower end protrude into the electromagnetic valve body fixing hole 331, and the valve body outer thread 611 is fixed with the fixing hole wall thread formed on the inner wall of the electromagnetic valve body fixing hole 331, and is locked by the valve body locking nut 618, an upper sealing ring 612 and a lower sealing ring 613 are respectively sleeved on the upper part and the lower part of the valve body outer thread 611 at the lower end of the hydraulic electromagnetic valve 61, the lower end port of the hydraulic electromagnetic valve 61 is formed into an electromagnetic valve oil passage hole 614, and the area between the upper sealing ring 612 and the lower sealing ring 613 is formed into a mesh oil passage part 615 of the hydraulic electromagnetic valve 61, the lower end of the valve core 616 is formed into a valve 6161, the oil reservoir return oil hole 3221 is communicated with the electromagnetic valve oil passage hole 614 through the return oil hole passage 3311 formed by the bottom of the electromagnetic valve body fixing hole 331, the oil cylinder return oil hole 3212 is communicated with the mesh oil passage part 615 through the oil leakage hole passage 3312 formed by the electromagnetic valve body fixing hole 331 and located between the upper sealing ring 612 and the lower sealing ring 613, the passage between the electromagnetic valve oil passage hole 614 and the mesh oil passage part 615 is opened or closed by the upward or downward movement of the valve core 616 together with the valve 6161, and the upward or downward movement of the valve core 616 together with the valve 6161 depends on the energization or de-energization of the electromagnetic coil; wherein, a hydraulic electromagnetic valve working power supply female socket 617 is arranged on one side of the hydraulic electromagnetic valve 61 and is electrically connected to the hydraulic electromagnetic valve 61, and the socket hole 6171 of the hydraulic electromagnetic valve working power supply female socket 617 is matched with the male plug electrically connected to the external power supply.

[0042] Please refer to Figure 11In the middle of the valve body 3 and at the position on the left side of the oil cylinder column retraction control mechanism 6, a storage oil chamber oil suction passage 34 is longitudinally formed, the bottom of the storage oil chamber oil suction passage 34 is communicated with the storage oil chamber oil suction hole 3223, the middle of the storage oil chamber oil suction passage 34 is communicated with the pump oil chamber oil inlet hole 311, and a storage oil chamber oil suction passage steel ball valve 341 is arranged in the storage oil chamber oil suction passage 34 to open or block the oil passage between the storage oil chamber oil suction hole 3223 and the pump oil chamber oil inlet hole 311, the upper end of the storage oil chamber oil suction passage 34 is blocked by a storage oil chamber oil suction passage plug 342, and the storage oil chamber oil suction passage plug 342 is screwed in the storage oil chamber oil suction passage plug hole 35 formed on the valve body 3 at the position on the left side of the oil cylinder column retraction control mechanism 6.

[0043] Please see Figure 11 In the middle of the valve body 3 and at the position on the left side of the oil cylinder column retraction control mechanism 6, a pressure regulating valve hole 36 is longitudinally formed, from bottom to top, a pressure relief hole oil passage on-off steel ball valve 361, a steel ball valve acting spring 362 and a spring pressure adjusting screw 363 are arranged in the pressure regulating valve hole 36, the pressure relief hole oil passage on-off steel ball valve 361 opens or blocks the oil passage between the pressure relief hole 3222 and the pump oil chamber oil outlet hole 312, the lower end of the steel ball valve acting spring 362 is supported on the pressure relief hole oil passage on-off steel ball valve 361, and the upper end is supported on the lower end face of the spring pressure adjusting screw 363, the spring pressure adjusting screw 363 is fixed in the hole wall internal thread formed on the hole wall at the upper end of the pressure regulating valve hole 36; wherein, in the valve body 3 and at the position below the pressure relief hole oil passage on-off steel ball valve 361, a pressure relief passage 364 (also referred to as "pressure relief oil passage") is formed, which is communicated with the pressure relief hole 3222 and communicated with the pump oil chamber oil outlet hole 312 through the connecting oil passage 38 mentioned below. The opening and closing of the pressure relief hole oil passage on-off steel ball valve 361 opens or closes the communication between the pressure relief passage 364 and the pressure relief hole 3222.

[0044] Please see Figure 7 and Figure 8 In Figure 7 , an oil inlet hole passage 37 is shown in a transverse state, i.e. in a horizontal state, and a connecting oil passage 38 is shown in a longitudinal state, the connecting oil passage 38 is communicated with the pump oil chamber oil outlet hole 312, and the connecting oil passage 38 is also communicated with the oil inlet hole passage 37, a connecting oil passage oil plug 381 is arranged at the bottom of the connecting oil passage 38, i.e. at the oil passage sealing position of the connecting oil passage 38, which is screwed in the connecting oil passage oil plug hole of the lower left end of the valve body 3. Figure 8The oil inlet hole channel 37 is communicated with the oil inlet hole 3211 of the oil cylinder, and an oil hole channel plug 371 is arranged at the left end of the oil inlet hole channel 37, i.e., the oil channel sealing position, and is screwed with the oil inlet hole channel oil plug hole of the left side of the valve body 3.

[0045] Please refer to Figure 12 In Figure 12 , the jack 7 mentioned above is shown, and the oil cylinder column pushing shaft 76 also mentioned above is shown, the two ends of the oil cylinder column pushing shaft 76, i.e., the front end and the rear end, are hinged to one end of a pair of connecting plates 77 of the structural system of the jack 7, and the other end of the pair of connecting plates 77 is hinged to the left end of the lifting arm 73 of the structural system of the jack 7 through a chain plate hinge pin shaft 771, and the left and right ends of the pair of wall plates 71 are each provided with a walking wheel 72 through a walking wheel shaft 721, Figure 12 In , the left end of a pair of connecting rods 74 hinged to the opposite side between the left ends of the pair of wall plates 71 through a pair of connecting rod hinge bolts 741 is also shown, and the right end of the pair of connecting rods 74 is hinged to a lifting arm top seat 731 located at the upper right end of the lifting arm 73 and shaped like a Chinese character “ㄇ” through a lifting arm top seat hinge pin shaft 742, the lifting arm top seat 731 is hinged to the right end of the lifting arm 73 through a lifting arm top seat hinge pin shaft 7311, the left end of the lifting arm 73 is hinged to the opposite side between the left ends of the pair of wall plates 71 through a lifting arm hinge shaft 732, and the right end of the lifting arm 73 is a free end that can be raised upward or reset downward, and a tray 75, which can also be called a tray, is hinged to the upward side of the lifting arm top seat 731 through a tray fixing screw 751, and is used to lift loads such as vehicle chassis and the like. Specifically, when the oil cylinder column 44 of the oil cylinder 4 of the utility model extends outward, i.e., extends to the right, the oil cylinder column hinge shaft head 442 of the oil cylinder column 44 acts on the aforementioned oil cylinder column pushing shaft 76, and the lifting arm 73 rotates counterclockwise around the lifting arm hinge shaft 732, the right end of the lifting arm 73 rises upward together with the lifting arm top seat 731 and the tray 75 to lift the load upward, at the same time, the left end of the pair of connecting rods 74 also rotates counterclockwise, and the right end rises upward with the lifting arm top seat 731, the connecting rod 74 pulls the lifting arm top seat 731 to rotate clockwise around the lifting arm top seat hinge pin shaft 7311 to keep the tray 75 horizontal during the lifting process. Conversely.

[0046] The applicant also needs to emphasize that: if the aforementioned oil pump 2 and valve body 3 are integrated into a single structure for the purpose of circumventing this utility model, then it should be considered equivalent to the structure of this application in which the oil pump cover 21, which serves as the oil pump body, is fixed to the oil pump cover fixing screw hole 315 on the valve body 3 by the oil pump cover fixing screw 212; furthermore, if the structure of the oil cylinder 4 is modified formally rather than substantially to increase the oil volume of the oil cylinder storage chamber 43 (i.e., to increase the oil storage volume), for example, by abandoning the oil cylinder storage chamber 43 and configuring an oil tank and placing the oil tank in a reasonable position, or by making adaptive changes to the oil passages on the valve body 3, then such modifications should also be considered to still fall within the scope of the technical content disclosed in this utility model. The same applies to other mechanisms that will not be elaborated upon further.

[0047] The applicant refers to the aforementioned Figure 12 And combined Figures 1 to 11 Briefly describe the working process of this utility model. So that by Figure 12 Taking the lifting arm 73 of the jack 7 shown as an example, it drives the tray 75 to lift the load. With the support of the power supply, the motor 1 is energized and operates. Since the motor shaft 11 is keyed to the motor shaft fixing plate 53 at the position corresponding to the motor shaft fixing plate hole 531, the motor shaft 11 drives the motor shaft fixing plate 53. Because the right side of the motor shaft fixing plate 53 has a D-shaped cross-section, the motor shaft fixing plate head 532 connects to the oil pump drive shaft insertion hole 521 of the transition connecting sleeve 52, which also has a D-shaped cross-section, and because the left end of the oil pump drive shaft 22 in the oil pump 2 structure system has a D-shaped cross-section (i.e., the left end of the oil pump drive shaft 22...), The transition sleeve 52 has a milled flat surface and is connected to the oil pump drive shaft insertion hole 521 of the transition connecting sleeve 52. Therefore, under the rotation of the motor shaft fixing disk 53 driven by the motor shaft 11, the motor shaft fixing disk shaft head 532 drives the transition connecting sleeve 52, and the transition connecting sleeve 52 drives the oil pump drive shaft 22 to rotate. The oil pump drive shaft 22 drives the oil pump drive shaft gear 24, and the oil pump drive shaft gear 24 drives the oil pump driven shaft gear 25 meshing with it, so that the entire oil pump 2 is in working condition. When the oil pump is in working condition, oil enters the oil inlet hole 311 of the pump oil chamber. At this time, Figure 6 The oil suction channel ball valve 341 in the oil storage chamber suction channel 34 shown is pushed open by the oil pressure and displaced to the upper end (upper part) of the oil storage chamber suction channel 34, thus unblocking the passage between the oil storage chamber suction hole 3223 and the pump oil inlet hole 311, allowing oil to enter the aforementioned and be discharged from the pump. Figure 1 and Figure 3 The pump oil chamber 31 shown in the figure then passes through the pump oil chamber 31 in sequence. Figure 2 The first oil guide groove 217 and the second oil guide groove 218 of the pump cover, as well as the oil outlet hole 312 of the pump oil chamber shown, sequentially enter the oil through the pump cover. Figure 7The connection oil passage 38 and the oil inlet hole passage 37 are shown, and the hydraulic oil sequentially passes through the oil inlet hole passage 37, the oil cylinder oil inlet hole 3211 and the oil cylinder oil storage cavity 43 of the oil cylinder 4 shown in the figure, and is forced by the pressure of the hydraulic oil to make the oil cylinder rod 44 extend to the right, that is, extend out of the cylinder body, so as to push the oil cylinder rod thrust shaft 76 shown in the figure, and the oil cylinder rod thrust shaft 76 acts on the lifting arm 73 shown in the figure, that is, pushes and lifts the lifting arm 73. Figure 5 The oil cylinder 4 shown in the figure, and is forced by the pressure of the hydraulic oil to make the oil cylinder rod 44 extend to the right, that is, extend out of the cylinder body, so as to push the oil cylinder rod thrust shaft 76 shown in the figure, and the oil cylinder rod thrust shaft 76 acts on the lifting arm 73 shown in the figure, that is, pushes and lifts the lifting arm 73. Figure 1 And Figure 12 The oil cylinder rod thrust shaft 76 acts on the lifting arm 73 shown in the figure, that is, pushes and lifts the lifting arm 73. Figure 12 The left end of the lifting arm 73 rotates counterclockwise around the lifting arm hinge shaft 732, so that the right end, which is the free end of the lifting arm 73, rises together with the tray 75, and the load is lifted upward by the tray 75 because the tray 75 is in contact with the load.

[0048] The lifting arm 73 descending process is that the hydraulic solenoid valve 61 of the structure system of the oil cylinder rod retracting control mechanism 6 is electrified, that is, the solenoid is electrified, and the hydraulic oil is forced by the pressure of the hydraulic oil to make the oil cylinder rod 44 retract into the oil cylinder 4. Figure 9 The spool 616 of the hydraulic solenoid valve 61 shown in detail is displaced upward together with the valve 6161, and the hydraulic oil passes through the oil cylinder oil return hole 3212 and the mesh type oil passage 615 (which can also be called a mesh type oil return part) shown in the figure. Figure 10 The hydraulic oil sequentially passes through the oil return hole passage 3311 shown in the figure and the oil storage cavity oil hole 3221, and enters the oil cylinder oil storage cavity 43 of the oil cylinder 4 shown in the figure. Figure 9 The hydraulic oil sequentially passes through the oil return hole passage 3311 shown in the figure and the oil storage cavity oil hole 3221, and enters the oil cylinder oil storage cavity 43 of the oil cylinder 4 shown in the figure. Figure 9 The hydraulic oil sequentially passes through the oil return hole passage 3311 shown in the figure and the oil storage cavity oil hole 3221, and enters the oil cylinder oil storage cavity 43 of the oil cylinder 4 shown in the figure. Figure 5 In the foregoing process, the oil cylinder rod 44 retracts into the oil cylinder 4, and in the retracting process, the aforementioned oil cylinder rod thrust shaft 76 moves in the opposite direction, so that the lifting arm 73 rotates clockwise around the oil cylinder rod thrust shaft 76, and the aforementioned free end, that is, the right end of the lifting arm 73, descends together with the tray 75, and the load previously lifted by the tray 75 also descends. After the descending action is completed, the power supply of the hydraulic solenoid valve 61 is disconnected.

[0049] The automatic pressure relief process is that during the oil pumping process, when the pressure exceeds the preset (predetermined) safety pressure of the spring 362 acting on the steel ball valve by the spring pressure adjusting screw 363 shown in the figure, the hydraulic oil passes through the oil outlet hole 312 of the oil pumping cavity shown in the figure, and sequentially passes through the aforementioned connection oil passage 38, the pressure relief oil passage 364 provided in the valve body 3 and communicated with the connection oil passage 38, and the oil storage cavity oil return hole 3222 after the top opening pressure relief hole oil passage on-off steel ball valve 361, and returns to the oil cylinder oil storage cavity 43 of the oil cylinder 4 shown in the figure. Figure 11 The hydraulic oil sequentially passes through the oil return hole passage 3311 shown in the figure and the oil storage cavity oil hole 3221, and enters the oil cylinder oil storage cavity 43 of the oil cylinder 4 shown in the figure. Figure 10 The hydraulic oil sequentially passes through the oil return hole passage 3311 shown in the figure and the oil storage cavity oil hole 3221, and enters the oil cylinder oil storage cavity 43 of the oil cylinder 4 shown in the figure. Figure 5 The hydraulic oil sequentially passes through the oil return hole passage 3311 shown in the figure and the oil storage cavity oil hole 3221, and enters the oil cylinder oil storage cavity 43 of the oil cylinder 4 shown in the figure.

[0050] The technical scheme provided by the utility model makes up for the shortcomings in the prior art, successfully completes the invention task, and truly realizes the technical effects described by the applicant in the technical effect column above.

Claims

1. An electric hydraulic device of a structurally improved jack comprising a motor (1), an oil pump (2), a valve body (3) and an oil cylinder (4), characterized in that: The oil cylinder column retraction control mechanism (6) is arranged on the valve body (3) and communicates with the oil cylinder (4) through the oil passage in the valve body (3); the motor (1) is drivingly connected with the oil pump (2) and is arranged in a horizontal state on the left side of the valve body (3) together with the oil pump (2) and the motor (1); the oil cylinder (4) is also arranged in a horizontal state on the right side or the left side of the valve body (3), and the oil pump (2) communicates with the oil cylinder (4) through the oil passage in the valve body (3).

2. The electrically powered hydraulic arrangement of a structurally improved jack as claimed in claim 1, wherein: A pump oil cavity (31) recessed on the left side surface of the valve body (3) is arranged at the central position of the left side of the valve body (3), a pump oil cavity oil inlet hole (311), a pump oil cavity oil outlet hole (312), an oil pump driving shaft pivot supporting hole (313) and an oil pump driven shaft pivot supporting hole (314) are arranged in the pump oil cavity (31), the pump oil cavity oil inlet hole (311) and the pump oil cavity oil outlet hole (312) each communicate with the oil cylinder (4) through the oil passage in the valve body (3), the oil pump (2) is matched with the pump oil cavity (31) and is also rotationally matched with the oil pump driving shaft pivot supporting hole (313) and the oil pump driven shaft pivot supporting hole (314); an oil cylinder seat (32) is arranged at the central region of the right side of the valve body (3), the oil cylinder seat (32) forms an oil cylinder column sleeve matching cavity (321), an oil cylinder oil inlet hole (3211) and an oil cylinder oil return hole (3212) are arranged in the oil cylinder column sleeve matching cavity (321), and an oil storage cavity oil return hole (3221), a pressure relief hole (3222) and an oil storage cavity oil suction hole (3223) are arranged at intervals on the right end surface (322) of the oil cylinder seat (32), the oil cylinder (4) is matched with the oil cylinder column sleeve matching cavity (321) in a horizontal state, the oil cylinder oil inlet hole (3211), the oil cylinder oil return hole (3212), the oil storage cavity oil return hole (3221), the pressure relief hole (3222) and the oil storage cavity oil suction hole (3223) each communicate with the oil cylinder (4) through the oil passage in the valve body (3); the oil cylinder column retraction control mechanism (6) arranged on the valve body (3) communicates with the oil cylinder oil return hole (3212) and the oil storage cavity oil return hole (3221).

3. The electrically powered hydraulic arrangement of a structurally improved jack as claimed in claim 2, wherein: The oil pump (2) is drivingly connected with the motor (1) through a transition connecting mechanism (5) arranged between the oil pump (2) and the motor (1). The oil pump (2) comprises an oil pump cover (21), an oil pump driving shaft (22), an oil pump driven shaft (23), an oil pump driving shaft gear (24) and an oil pump driven shaft gear (25). An oil pump cover flange (211) protruding from the right side surface of the oil pump cover (21) is arranged at the middle area of the right side of the oil pump cover (21) and at the position corresponding to the pump oil cavity (31). The oil pump cover flange (211) is inserted into the pump oil cavity (31) to form a complementary matching relationship with the pump oil cavity (31). A group of oil pump cover fixing screws (212) are arranged at intervals to fix the oil pump cover (21) to the valve body (3) at the position corresponding to the oil pump cover fixing screw hole (315) arranged on the left side of the valve body (3). A pump cover first oil guide groove (217) and a pump cover second oil guide groove (218) are arranged on the right side of the oil pump cover (21). The pump cover first oil guide groove (217) and the pump cover second oil guide groove (218) communicate with each other. The pump oil cavity oil inlet hole (311) corresponds to and communicates with the pump cover first oil guide groove (217). The pump oil cavity oil outlet hole (312) corresponds to and communicates with the pump cover second oil guide groove (218). The left end of the oil pump driving shaft (22) extends to the left side of the oil pump cover (21) through the oil pump driving shaft hole (213) arranged at the central position of the oil pump cover (21) and is drivingly connected with the transition connecting mechanism (5). The right end of the oil pump driving shaft (22) is rotatably supported in the oil pump driving shaft pivot supporting hole (313). The left end of the oil pump driven shaft (23) is rotatably supported in the oil pump driven shaft supporting hole (214) arranged on the right side of the oil pump cover (21). The right end of the oil pump driven shaft (23) is rotatably supported in the oil pump driven shaft pivot supporting hole (314). The oil pump driving shaft gear (24) is fixed on the oil pump driving shaft (22) in the pump oil cavity (31). The oil pump driven shaft gear (25) is fixed on the oil pump driven shaft (23) in the pump oil cavity (31) and meshes with the oil pump driving shaft gear (24).

4. An electrically powered hydraulic unit for a structurally improved jack as claimed in claim 3, characterised in that: A pump cover flange sealing ring (316) is arranged in the pump oil chamber (31), which is sleeved on the oil pump cover flange (211) to form a sealing fit between the outer wall of the oil pump cover flange (211) and the chamber wall of the pump oil chamber (31); a driving shaft sealing sleeve hole (215) with a diameter larger than that of the oil pump driving shaft hole (213) is formed in the central position of the oil pump cover (21) and at a position corresponding to the oil pump driving shaft hole (213), and a driving shaft sealing sleeve (2151) is embedded in the driving shaft sealing sleeve hole (215); the oil pump driving shaft (22) passes through the oil pump driving shaft hole (213) and then passes through the driving shaft sealing sleeve (2151) and extends to the left side of the driving shaft sealing sleeve (2151) to be drivingly connected with the transition connecting mechanism (5).

5. The electrically powered hydraulic arrangement of a structurally improved jack as claimed in claim 4, wherein: At least one pair of pump cover screw holes (216) are formed on the oil pump cover (21); the transition connecting mechanism (5) comprises an outer cover (51), a transition connecting sleeve (52), a motor shaft fixing disc (53) and a motor fixing connecting base (54), the outer cover (51) is formed with an outer cover cavity (511) with an open left side, a transition connecting sleeve pivot displacement hole (512) is formed on the right side cavity bottom wall of the outer cover cavity (511) and located at the central position of the cavity bottom wall, the middle part of the transition connecting sleeve (52) corresponds to the transition connecting sleeve pivot displacement hole (512), the left end of the transition connecting sleeve (52) is inserted into the outer cover cavity (511), and the right end of the transition connecting sleeve (52) extends to the right side of the cavity bottom wall, the motor shaft fixing disc (53) is arranged in the outer cover cavity (511) at a position corresponding to the left end of the transition connecting sleeve (52), the motor fixing connecting base (54) is arranged on the right side of the outer cover (51), the motor fixing connecting base (54) is fixed with the left side of the oil pump cover (21) by rotating at least one pair of motor fixing connecting base screws (542) through outer cover screw holes (513) formed on the outer cover (51) and into the pump cover screw holes (216) formed on the oil pump cover (21), a motor fixing connecting base motor shaft through hole (541) is formed in the motor fixing connecting base (54) and extends from the left side to the right side of the motor fixing connecting base (54), the motor fixing connecting base motor shaft through hole (541) corresponds to a motor shaft fixing disc hole (531) formed in the central position of the motor shaft fixing disc (53), a motor shaft fixing disc shaft head (532) extends to the right side of the motor shaft fixing disc (53) at the central position of the right side face of the motor shaft fixing disc (53), the motor shaft fixing disc shaft head (532) is connected with an oil pump driving shaft insertion hole (521) formed in the central position of the transition connecting sleeve (52) and extending from the left end to the right end of the transition connecting sleeve (52), the motor shaft (11) of the motor (1) extends to the right, the motor shaft (11) is inserted into the motor shaft fixing disc hole (531) after passing through the motor fixing connecting base motor shaft through hole (541) and is fixed with the motor shaft fixing disc (53) by means of a flat key, and the motor (1) is fixed with the left side of the motor fixing connecting base (54) by means of a motor fixing screw (12); the left end of the oil pump driving shaft (22) is fixed with the transition connecting sleeve (52) after passing through the driving shaft sealing sleeve (2151) and extending to the right end of the oil pump driving shaft insertion hole (521), and the motor shaft fixing disc shaft head (532) is inserted into the left end of the oil pump driving shaft insertion hole (521) and is fixed with the transition connecting sleeve (52).

6. An electrically powered hydraulic unit for a structurally improved jack as claimed in claim 5, characterised in that: The left end of the oil pump driving shaft (22) and the cross section shape of the motor shaft fixing disc shaft head (532) are both D-shaped, the cross section shape of the oil pump driving shaft insertion hole (521) is also D-shaped, the motor shaft key matching groove is formed on the hole wall of the motor shaft fixing disc hole (531) of the motor shaft fixing disc (53), and the motor shaft key is formed on the motor shaft (11) and at the position corresponding to the motor shaft key matching groove, which matches with the motor shaft key matching groove.

7. The electrically powered hydraulic arrangement of a structurally improved jack as claimed in claim 2, wherein: On the right side surface of the oil cylinder seat (32) formed in the central area of the right side of the valve body (3) and around the circumferential direction of the oil cylinder seat (32), an oil cylinder outer sleeve fitting groove (323) recessed in the right side surface of the oil cylinder seat (32) is opened; the oil cylinder (4) comprises an oil cylinder outer sleeve (41), an oil cylinder column sleeve (42), an oil cylinder oil storage cavity (43), an oil cylinder column (44) and a pressure oil cavity (45), the left end of the oil cylinder outer sleeve (41) is sealingly fitted with the oil cylinder outer sleeve fitting groove (323), the left end of the oil cylinder column sleeve (42) is matched with the oil cylinder column sleeve matching cavity (321), the oil cylinder oil storage cavity (43) is located between the outer wall of the oil cylinder column sleeve (42) and the inner wall of the oil cylinder outer sleeve (41), the oil cylinder column (44) is movably located in the oil cylinder column sleeve (42), an oil cylinder column piston (441) is arranged at the left end of the oil cylinder column (44), the pressure oil cavity (45) is divided into a left oil cavity (451) located at the left side of the oil cylinder column piston (441) and a right oil cavity (452) located at the right side of the oil cylinder column piston (441) by the oil cylinder column piston (441); the oil cylinder oil inlet hole (3211) and the oil cylinder oil return hole (3212) are communicated with the left oil cavity (451); the oil storage cavity oil return hole (3221), the pressure relief hole (3222) and the oil storage cavity oil suction hole (3223) are communicated with the oil cylinder oil storage cavity (43).

8. The electrically powered hydraulic arrangement of a structurally improved jack as claimed in claim 2, wherein: In the middle of the valve body (3) and above the position corresponding to the oil cylinder seat (32), there is a solenoid valve body fixing seat (33) bulging out of the rear surface of the valve body (3), and a solenoid valve body fixing hole (331) is formed in the position corresponding to the solenoid valve body fixing seat (33); the oil cylinder column retraction control mechanism (6) comprises a hydraulic solenoid valve (61) provided with a solenoid coil and a valve core (616) inside, which is arranged on the solenoid valve body fixing seat (33) in the position corresponding to the solenoid valve body fixing hole (331), the upper end of the hydraulic solenoid valve (61) protrudes out of the upper surface of the solenoid valve body fixing seat (33), the middle part and the lower end protrude into the solenoid valve body fixing hole (331), and are fixed by the valve body outer thread (611) and the fixing hole wall thread formed on the inner wall of the solenoid valve body fixing hole (331), and are locked by the valve body locking nut (618), an upper sealing ring (612) and a lower sealing ring (613) are respectively sleeved on the upper part and the lower part of the valve body outer thread (611) at the lower end of the hydraulic solenoid valve (61), the lower end port of the hydraulic solenoid valve (61) is formed into a solenoid valve oil passage hole (614), and the area between the upper sealing ring (612) and the lower sealing ring (613) is formed into a mesh type oil passage part (615) of the hydraulic solenoid valve (61), the lower end of the valve core (616) is formed into a valve (6161), the oil storage tank oil return hole (3221) communicates with the solenoid valve oil passage hole (614) through the oil return hole passage (3311) formed by the bottom of the solenoid valve body fixing hole (331), the oil cylinder oil return hole (3212) communicates with the mesh type oil passage part (615) through the oil leakage hole passage (3312) formed by the solenoid valve body fixing hole (331) and located between the upper sealing ring (612) and the lower sealing ring (613), the passage between the solenoid valve oil passage hole (614) and the mesh type oil passage part (615) is opened or closed by the upward or downward movement of the valve core (616) and the valve (6161), and the upward or downward movement of the valve core (616) and the valve (6161) depends on the energization or de-energization of the solenoid coil; a hydraulic solenoid valve working power supply lead-in female socket (617) electrically connected with the hydraulic solenoid valve (61) is arranged on one side of the hydraulic solenoid valve (61), and the socket hole (6171) of the hydraulic solenoid valve working power supply lead-in female socket (617) is matched with a male plug electrically connected with an external power supply.

9. The electrically powered hydraulic arrangement of a structurally improved jack as claimed in claim 2, wherein: In the middle of the valve body (3) and at the left side of the oil cylinder column retraction control mechanism (6) a longitudinal oil storage cavity oil suction passage (34) is formed, the bottom of the oil storage cavity oil suction passage (34) is communicated with the oil storage cavity oil suction hole (3223), the middle of the oil storage cavity oil suction passage (34) is communicated with the pump oil cavity oil inlet hole (311), and a steel ball valve (341) for opening or blocking the oil passage between the oil storage cavity oil suction hole (3223) and the pump oil cavity oil inlet hole (311) is arranged in the oil storage cavity oil suction passage (34), the upper end of the oil storage cavity oil suction passage (34) is blocked by an oil storage cavity oil suction passage plug (342), and the oil storage cavity oil suction passage plug (342) is screwed with an oil storage cavity oil suction passage plug hole (35) formed on the valve body (3) at the left side of the oil cylinder column retraction control mechanism (6).

10. The electrically powered hydraulic arrangement of a structurally improved jack as claimed in claim 2, wherein: In the middle of the valve body (3) and at the left side of the oil cylinder column retraction control mechanism (6) a longitudinal pressure regulating valve hole (36) is formed, from bottom to top in the pressure regulating valve hole (36) are arranged a pressure relief hole oil passage opening and closing steel ball valve (361), a steel ball valve acting spring (362) and a spring pressure adjusting screw (363), the pressure relief hole oil passage opening and closing steel ball valve (361) opens or blocks the oil passage between the pressure relief hole (3222) and the pump oil cavity oil outlet hole (312), the lower end of the steel ball valve acting spring (362) is supported on the pressure relief hole oil passage opening and closing steel ball valve (361), and the upper end is supported on the lower end face of the spring pressure adjusting screw (363), the spring pressure adjusting screw (363) is fixed with the hole wall internal thread formed on the hole wall of the upper end of the pressure regulating valve hole (36); wherein, in the valve body (3) and at the position below the pressure relief hole oil passage opening and closing steel ball valve (361) a pressure relief passage (364) is formed, the pressure relief passage (364) is communicated with the pressure relief hole (3222) and also communicated with the pump oil cavity oil outlet hole (312), the opening and closing of the pressure relief passage (364) and the pressure relief hole (3222) is controlled by the pressure relief hole oil passage opening and closing steel ball valve (361).

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